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// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#if V8_TARGET_ARCH_MIPS
#include "bootstrapper.h"
#include "code-stubs.h"
#include "codegen.h"
#include "regexp-macro-assembler.h"
#include "stub-cache.h"
namespace v8 {
namespace internal {
void FastNewClosureStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a2 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kNewClosureFromStubFailure)->entry;
}
void ToNumberStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a0 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void NumberToStringStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a0 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kNumberToString)->entry;
}
void FastCloneShallowArrayStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a3, a2, a1 };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kCreateArrayLiteralStubBailout)->entry;
}
void FastCloneShallowObjectStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a3, a2, a1, a0 };
descriptor->register_param_count_ = 4;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kCreateObjectLiteral)->entry;
}
void CreateAllocationSiteStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a2 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a1, a0 };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
}
void KeyedLoadDictionaryElementStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = {a1, a0 };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
}
void LoadFieldStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a0 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a1 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void KeyedArrayCallStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a2 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->continuation_type_ = TAIL_CALL_CONTINUATION;
descriptor->handler_arguments_mode_ = PASS_ARGUMENTS;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(KeyedCallIC_MissFromStubFailure);
}
void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a2, a1, a0 };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure);
}
void TransitionElementsKindStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a0, a1 };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
Address entry =
Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry;
descriptor->deoptimization_handler_ = FUNCTION_ADDR(entry);
}
void CompareNilICStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a0 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(CompareNilIC_Miss);
descriptor->SetMissHandler(
ExternalReference(IC_Utility(IC::kCompareNilIC_Miss), isolate));
}
static void InitializeArrayConstructorDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor,
int constant_stack_parameter_count) {
// register state
// a0 -- number of arguments
// a1 -- function
// a2 -- type info cell with elements kind
static Register registers_variable_args[] = { a1, a2, a0 };
static Register registers_no_args[] = { a1, a2 };
if (constant_stack_parameter_count == 0) {
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers_no_args;
} else {
// stack param count needs (constructor pointer, and single argument)
descriptor->handler_arguments_mode_ = PASS_ARGUMENTS;
descriptor->stack_parameter_count_ = a0;
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers_variable_args;
}
descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
descriptor->function_mode_ = JS_FUNCTION_STUB_MODE;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kArrayConstructor)->entry;
}
static void InitializeInternalArrayConstructorDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor,
int constant_stack_parameter_count) {
// register state
// a0 -- number of arguments
// a1 -- constructor function
static Register registers_variable_args[] = { a1, a0 };
static Register registers_no_args[] = { a1 };
if (constant_stack_parameter_count == 0) {
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers_no_args;
} else {
// stack param count needs (constructor pointer, and single argument)
descriptor->handler_arguments_mode_ = PASS_ARGUMENTS;
descriptor->stack_parameter_count_ = a0;
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers_variable_args;
}
descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
descriptor->function_mode_ = JS_FUNCTION_STUB_MODE;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kInternalArrayConstructor)->entry;
}
void ArrayNoArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeArrayConstructorDescriptor(isolate, descriptor, 0);
}
void ArraySingleArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeArrayConstructorDescriptor(isolate, descriptor, 1);
}
void ArrayNArgumentsConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeArrayConstructorDescriptor(isolate, descriptor, -1);
}
void ToBooleanStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a0 };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(ToBooleanIC_Miss);
descriptor->SetMissHandler(
ExternalReference(IC_Utility(IC::kToBooleanIC_Miss), isolate));
}
void InternalArrayNoArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeInternalArrayConstructorDescriptor(isolate, descriptor, 0);
}
void InternalArraySingleArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeInternalArrayConstructorDescriptor(isolate, descriptor, 1);
}
void InternalArrayNArgumentsConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeInternalArrayConstructorDescriptor(isolate, descriptor, -1);
}
void StoreGlobalStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a1, a2, a0 };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(StoreIC_MissFromStubFailure);
}
void ElementsTransitionAndStoreStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a0, a3, a1, a2 };
descriptor->register_param_count_ = 4;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss);
}
void BinaryOpICStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a1, a0 };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = FUNCTION_ADDR(BinaryOpIC_Miss);
descriptor->SetMissHandler(
ExternalReference(IC_Utility(IC::kBinaryOpIC_Miss), isolate));
}
void BinaryOpWithAllocationSiteStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a2, a1, a0 };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(BinaryOpIC_MissWithAllocationSite);
}
void NewStringAddStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { a1, a0 };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kStringAdd)->entry;
}
#define __ ACCESS_MASM(masm)
static void EmitIdenticalObjectComparison(MacroAssembler* masm,
Label* slow,
Condition cc);
static void EmitSmiNonsmiComparison(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* rhs_not_nan,
Label* slow,
bool strict);
static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm,
Register lhs,
Register rhs);
void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm) {
// Update the static counter each time a new code stub is generated.
Isolate* isolate = masm->isolate();
isolate->counters()->code_stubs()->Increment();
CodeStubInterfaceDescriptor* descriptor = GetInterfaceDescriptor(isolate);
int param_count = descriptor->register_param_count_;
{
// Call the runtime system in a fresh internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
ASSERT(descriptor->register_param_count_ == 0 ||
a0.is(descriptor->register_params_[param_count - 1]));
// Push arguments
for (int i = 0; i < param_count; ++i) {
__ push(descriptor->register_params_[i]);
}
ExternalReference miss = descriptor->miss_handler();
__ CallExternalReference(miss, descriptor->register_param_count_);
}
__ Ret();
}
void FastNewContextStub::Generate(MacroAssembler* masm) {
// Try to allocate the context in new space.
Label gc;
int length = slots_ + Context::MIN_CONTEXT_SLOTS;
// Attempt to allocate the context in new space.
__ Allocate(FixedArray::SizeFor(length), v0, a1, a2, &gc, TAG_OBJECT);
// Load the function from the stack.
__ lw(a3, MemOperand(sp, 0));
// Set up the object header.
__ LoadRoot(a1, Heap::kFunctionContextMapRootIndex);
__ li(a2, Operand(Smi::FromInt(length)));
__ sw(a2, FieldMemOperand(v0, FixedArray::kLengthOffset));
__ sw(a1, FieldMemOperand(v0, HeapObject::kMapOffset));
// Set up the fixed slots, copy the global object from the previous context.
__ lw(a2, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
__ li(a1, Operand(Smi::FromInt(0)));
__ sw(a3, MemOperand(v0, Context::SlotOffset(Context::CLOSURE_INDEX)));
__ sw(cp, MemOperand(v0, Context::SlotOffset(Context::PREVIOUS_INDEX)));
__ sw(a1, MemOperand(v0, Context::SlotOffset(Context::EXTENSION_INDEX)));
__ sw(a2, MemOperand(v0, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
// Initialize the rest of the slots to undefined.
__ LoadRoot(a1, Heap::kUndefinedValueRootIndex);
for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
__ sw(a1, MemOperand(v0, Context::SlotOffset(i)));
}
// Remove the on-stack argument and return.
__ mov(cp, v0);
__ DropAndRet(1);
// Need to collect. Call into runtime system.
__ bind(&gc);
__ TailCallRuntime(Runtime::kNewFunctionContext, 1, 1);
}
void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
// Stack layout on entry:
//
// [sp]: function.
// [sp + kPointerSize]: serialized scope info
// Try to allocate the context in new space.
Label gc;
int length = slots_ + Context::MIN_CONTEXT_SLOTS;
__ Allocate(FixedArray::SizeFor(length), v0, a1, a2, &gc, TAG_OBJECT);
// Load the function from the stack.
__ lw(a3, MemOperand(sp, 0));
// Load the serialized scope info from the stack.
__ lw(a1, MemOperand(sp, 1 * kPointerSize));
// Set up the object header.
__ LoadRoot(a2, Heap::kBlockContextMapRootIndex);
__ sw(a2, FieldMemOperand(v0, HeapObject::kMapOffset));
__ li(a2, Operand(Smi::FromInt(length)));
__ sw(a2, FieldMemOperand(v0, FixedArray::kLengthOffset));
// If this block context is nested in the native context we get a smi
// sentinel instead of a function. The block context should get the
// canonical empty function of the native context as its closure which
// we still have to look up.
Label after_sentinel;
__ JumpIfNotSmi(a3, &after_sentinel);
if (FLAG_debug_code) {
__ Assert(eq, kExpected0AsASmiSentinel, a3, Operand(zero_reg));
}
__ lw(a3, GlobalObjectOperand());
__ lw(a3, FieldMemOperand(a3, GlobalObject::kNativeContextOffset));
__ lw(a3, ContextOperand(a3, Context::CLOSURE_INDEX));
__ bind(&after_sentinel);
// Set up the fixed slots, copy the global object from the previous context.
__ lw(a2, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
__ sw(a3, ContextOperand(v0, Context::CLOSURE_INDEX));
__ sw(cp, ContextOperand(v0, Context::PREVIOUS_INDEX));
__ sw(a1, ContextOperand(v0, Context::EXTENSION_INDEX));
__ sw(a2, ContextOperand(v0, Context::GLOBAL_OBJECT_INDEX));
// Initialize the rest of the slots to the hole value.
__ LoadRoot(a1, Heap::kTheHoleValueRootIndex);
for (int i = 0; i < slots_; i++) {
__ sw(a1, ContextOperand(v0, i + Context::MIN_CONTEXT_SLOTS));
}
// Remove the on-stack argument and return.
__ mov(cp, v0);
__ DropAndRet(2);
// Need to collect. Call into runtime system.
__ bind(&gc);
__ TailCallRuntime(Runtime::kPushBlockContext, 2, 1);
}
// Takes a Smi and converts to an IEEE 64 bit floating point value in two
// registers. The format is 1 sign bit, 11 exponent bits (biased 1023) and
// 52 fraction bits (20 in the first word, 32 in the second). Zeros is a
// scratch register. Destroys the source register. No GC occurs during this
// stub so you don't have to set up the frame.
class ConvertToDoubleStub : public PlatformCodeStub {
public:
ConvertToDoubleStub(Register result_reg_1,
Register result_reg_2,
Register source_reg,
Register scratch_reg)
: result1_(result_reg_1),
result2_(result_reg_2),
source_(source_reg),
zeros_(scratch_reg) { }
private:
Register result1_;
Register result2_;
Register source_;
Register zeros_;
// Minor key encoding in 16 bits.
class ModeBits: public BitField<OverwriteMode, 0, 2> {};
class OpBits: public BitField<Token::Value, 2, 14> {};
Major MajorKey() { return ConvertToDouble; }
int MinorKey() {
// Encode the parameters in a unique 16 bit value.
return result1_.code() +
(result2_.code() << 4) +
(source_.code() << 8) +
(zeros_.code() << 12);
}
void Generate(MacroAssembler* masm);
};
void ConvertToDoubleStub::Generate(MacroAssembler* masm) {
#ifndef BIG_ENDIAN_FLOATING_POINT
Register exponent = result1_;
Register mantissa = result2_;
#else
Register exponent = result2_;
Register mantissa = result1_;
#endif
Label not_special;
// Convert from Smi to integer.
__ sra(source_, source_, kSmiTagSize);
// Move sign bit from source to destination. This works because the sign bit
// in the exponent word of the double has the same position and polarity as
// the 2's complement sign bit in a Smi.
STATIC_ASSERT(HeapNumber::kSignMask == 0x80000000u);
__ And(exponent, source_, Operand(HeapNumber::kSignMask));
// Subtract from 0 if source was negative.
__ subu(at, zero_reg, source_);
__ Movn(source_, at, exponent);
// We have -1, 0 or 1, which we treat specially. Register source_ contains
// absolute value: it is either equal to 1 (special case of -1 and 1),
// greater than 1 (not a special case) or less than 1 (special case of 0).
__ Branch(&not_special, gt, source_, Operand(1));
// For 1 or -1 we need to or in the 0 exponent (biased to 1023).
const uint32_t exponent_word_for_1 =
HeapNumber::kExponentBias << HeapNumber::kExponentShift;
// Safe to use 'at' as dest reg here.
__ Or(at, exponent, Operand(exponent_word_for_1));
__ Movn(exponent, at, source_); // Write exp when source not 0.
// 1, 0 and -1 all have 0 for the second word.
__ Ret(USE_DELAY_SLOT);
__ mov(mantissa, zero_reg);
__ bind(&not_special);
// Count leading zeros.
// Gets the wrong answer for 0, but we already checked for that case above.
__ Clz(zeros_, source_);
// Compute exponent and or it into the exponent register.
// We use mantissa as a scratch register here.
__ li(mantissa, Operand(31 + HeapNumber::kExponentBias));
__ subu(mantissa, mantissa, zeros_);
__ sll(mantissa, mantissa, HeapNumber::kExponentShift);
__ Or(exponent, exponent, mantissa);
// Shift up the source chopping the top bit off.
__ Addu(zeros_, zeros_, Operand(1));
// This wouldn't work for 1.0 or -1.0 as the shift would be 32 which means 0.
__ sllv(source_, source_, zeros_);
// Compute lower part of fraction (last 12 bits).
__ sll(mantissa, source_, HeapNumber::kMantissaBitsInTopWord);
// And the top (top 20 bits).
__ srl(source_, source_, 32 - HeapNumber::kMantissaBitsInTopWord);
__ Ret(USE_DELAY_SLOT);
__ or_(exponent, exponent, source_);
}
void DoubleToIStub::Generate(MacroAssembler* masm) {
Label out_of_range, only_low, negate, done;
Register input_reg = source();
Register result_reg = destination();
int double_offset = offset();
// Account for saved regs if input is sp.
if (input_reg.is(sp)) double_offset += 3 * kPointerSize;
Register scratch =
GetRegisterThatIsNotOneOf(input_reg, result_reg);
Register scratch2 =
GetRegisterThatIsNotOneOf(input_reg, result_reg, scratch);
Register scratch3 =
GetRegisterThatIsNotOneOf(input_reg, result_reg, scratch, scratch2);
DoubleRegister double_scratch = kLithiumScratchDouble;
__ Push(scratch, scratch2, scratch3);
if (!skip_fastpath()) {
// Load double input.
__ ldc1(double_scratch, MemOperand(input_reg, double_offset));
// Clear cumulative exception flags and save the FCSR.
__ cfc1(scratch2, FCSR);
__ ctc1(zero_reg, FCSR);
// Try a conversion to a signed integer.
__ Trunc_w_d(double_scratch, double_scratch);
// Move the converted value into the result register.
__ mfc1(result_reg, double_scratch);
// Retrieve and restore the FCSR.
__ cfc1(scratch, FCSR);
__ ctc1(scratch2, FCSR);
// Check for overflow and NaNs.
__ And(
scratch, scratch,
kFCSROverflowFlagMask | kFCSRUnderflowFlagMask
| kFCSRInvalidOpFlagMask);
// If we had no exceptions we are done.
__ Branch(&done, eq, scratch, Operand(zero_reg));
}
// Load the double value and perform a manual truncation.
Register input_high = scratch2;
Register input_low = scratch3;
__ lw(input_low, MemOperand(input_reg, double_offset));
__ lw(input_high, MemOperand(input_reg, double_offset + kIntSize));
Label normal_exponent, restore_sign;
// Extract the biased exponent in result.
__ Ext(result_reg,
input_high,
HeapNumber::kExponentShift,
HeapNumber::kExponentBits);
// Check for Infinity and NaNs, which should return 0.
__ Subu(scratch, result_reg, HeapNumber::kExponentMask);
__ Movz(result_reg, zero_reg, scratch);
__ Branch(&done, eq, scratch, Operand(zero_reg));
// Express exponent as delta to (number of mantissa bits + 31).
__ Subu(result_reg,
result_reg,
Operand(HeapNumber::kExponentBias + HeapNumber::kMantissaBits + 31));
// If the delta is strictly positive, all bits would be shifted away,
// which means that we can return 0.
__ Branch(&normal_exponent, le, result_reg, Operand(zero_reg));
__ mov(result_reg, zero_reg);
__ Branch(&done);
__ bind(&normal_exponent);
const int kShiftBase = HeapNumber::kNonMantissaBitsInTopWord - 1;
// Calculate shift.
__ Addu(scratch, result_reg, Operand(kShiftBase + HeapNumber::kMantissaBits));
// Save the sign.
Register sign = result_reg;
result_reg = no_reg;
__ And(sign, input_high, Operand(HeapNumber::kSignMask));
// On ARM shifts > 31 bits are valid and will result in zero. On MIPS we need
// to check for this specific case.
Label high_shift_needed, high_shift_done;
__ Branch(&high_shift_needed, lt, scratch, Operand(32));
__ mov(input_high, zero_reg);
__ Branch(&high_shift_done);
__ bind(&high_shift_needed);
// Set the implicit 1 before the mantissa part in input_high.
__ Or(input_high,
input_high,
Operand(1 << HeapNumber::kMantissaBitsInTopWord));
// Shift the mantissa bits to the correct position.
// We don't need to clear non-mantissa bits as they will be shifted away.
// If they weren't, it would mean that the answer is in the 32bit range.
__ sllv(input_high, input_high, scratch);
__ bind(&high_shift_done);
// Replace the shifted bits with bits from the lower mantissa word.
Label pos_shift, shift_done;
__ li(at, 32);
__ subu(scratch, at, scratch);
__ Branch(&pos_shift, ge, scratch, Operand(zero_reg));
// Negate scratch.
__ Subu(scratch, zero_reg, scratch);
__ sllv(input_low, input_low, scratch);
__ Branch(&shift_done);
__ bind(&pos_shift);
__ srlv(input_low, input_low, scratch);
__ bind(&shift_done);
__ Or(input_high, input_high, Operand(input_low));
// Restore sign if necessary.
__ mov(scratch, sign);
result_reg = sign;
sign = no_reg;
__ Subu(result_reg, zero_reg, input_high);
__ Movz(result_reg, input_high, scratch);
__ bind(&done);
__ Pop(scratch, scratch2, scratch3);
__ Ret();
}
void WriteInt32ToHeapNumberStub::GenerateFixedRegStubsAheadOfTime(
Isolate* isolate) {
WriteInt32ToHeapNumberStub stub1(a1, v0, a2, a3);
WriteInt32ToHeapNumberStub stub2(a2, v0, a3, a0);
stub1.GetCode(isolate);
stub2.GetCode(isolate);
}
// See comment for class, this does NOT work for int32's that are in Smi range.
void WriteInt32ToHeapNumberStub::Generate(MacroAssembler* masm) {
Label max_negative_int;
// the_int_ has the answer which is a signed int32 but not a Smi.
// We test for the special value that has a different exponent.
STATIC_ASSERT(HeapNumber::kSignMask == 0x80000000u);
// Test sign, and save for later conditionals.
__ And(sign_, the_int_, Operand(0x80000000u));
__ Branch(&max_negative_int, eq, the_int_, Operand(0x80000000u));
// Set up the correct exponent in scratch_. All non-Smi int32s have the same.
// A non-Smi integer is 1.xxx * 2^30 so the exponent is 30 (biased).
uint32_t non_smi_exponent =
(HeapNumber::kExponentBias + 30) << HeapNumber::kExponentShift;
__ li(scratch_, Operand(non_smi_exponent));
// Set the sign bit in scratch_ if the value was negative.
__ or_(scratch_, scratch_, sign_);
// Subtract from 0 if the value was negative.
__ subu(at, zero_reg, the_int_);
__ Movn(the_int_, at, sign_);
// We should be masking the implict first digit of the mantissa away here,
// but it just ends up combining harmlessly with the last digit of the
// exponent that happens to be 1. The sign bit is 0 so we shift 10 to get
// the most significant 1 to hit the last bit of the 12 bit sign and exponent.
ASSERT(((1 << HeapNumber::kExponentShift) & non_smi_exponent) != 0);
const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2;
__ srl(at, the_int_, shift_distance);
__ or_(scratch_, scratch_, at);
__ sw(scratch_, FieldMemOperand(the_heap_number_,
HeapNumber::kExponentOffset));
__ sll(scratch_, the_int_, 32 - shift_distance);
__ Ret(USE_DELAY_SLOT);
__ sw(scratch_, FieldMemOperand(the_heap_number_,
HeapNumber::kMantissaOffset));
__ bind(&max_negative_int);
// The max negative int32 is stored as a positive number in the mantissa of
// a double because it uses a sign bit instead of using two's complement.
// The actual mantissa bits stored are all 0 because the implicit most
// significant 1 bit is not stored.
non_smi_exponent += 1 << HeapNumber::kExponentShift;
__ li(scratch_, Operand(HeapNumber::kSignMask | non_smi_exponent));
__ sw(scratch_,
FieldMemOperand(the_heap_number_, HeapNumber::kExponentOffset));
__ mov(scratch_, zero_reg);
__ Ret(USE_DELAY_SLOT);
__ sw(scratch_,
FieldMemOperand(the_heap_number_, HeapNumber::kMantissaOffset));
}
// Handle the case where the lhs and rhs are the same object.
// Equality is almost reflexive (everything but NaN), so this is a test
// for "identity and not NaN".
static void EmitIdenticalObjectComparison(MacroAssembler* masm,
Label* slow,
Condition cc) {
Label not_identical;
Label heap_number, return_equal;
Register exp_mask_reg = t5;
__ Branch(&not_identical, ne, a0, Operand(a1));
__ li(exp_mask_reg, Operand(HeapNumber::kExponentMask));
// Test for NaN. Sadly, we can't just compare to Factory::nan_value(),
// so we do the second best thing - test it ourselves.
// They are both equal and they are not both Smis so both of them are not
// Smis. If it's not a heap number, then return equal.
if (cc == less || cc == greater) {
__ GetObjectType(a0, t4, t4);
__ Branch(slow, greater, t4, Operand(FIRST_SPEC_OBJECT_TYPE));
} else {
__ GetObjectType(a0, t4, t4);
__ Branch(&heap_number, eq, t4, Operand(HEAP_NUMBER_TYPE));
// Comparing JS objects with <=, >= is complicated.
if (cc != eq) {
__ Branch(slow, greater, t4, Operand(FIRST_SPEC_OBJECT_TYPE));
// Normally here we fall through to return_equal, but undefined is
// special: (undefined == undefined) == true, but
// (undefined <= undefined) == false! See ECMAScript 11.8.5.
if (cc == less_equal || cc == greater_equal) {
__ Branch(&return_equal, ne, t4, Operand(ODDBALL_TYPE));
__ LoadRoot(t2, Heap::kUndefinedValueRootIndex);
__ Branch(&return_equal, ne, a0, Operand(t2));
ASSERT(is_int16(GREATER) && is_int16(LESS));
__ Ret(USE_DELAY_SLOT);
if (cc == le) {
// undefined <= undefined should fail.
__ li(v0, Operand(GREATER));
} else {
// undefined >= undefined should fail.
__ li(v0, Operand(LESS));
}
}
}
}
__ bind(&return_equal);
ASSERT(is_int16(GREATER) && is_int16(LESS));
__ Ret(USE_DELAY_SLOT);
if (cc == less) {
__ li(v0, Operand(GREATER)); // Things aren't less than themselves.
} else if (cc == greater) {
__ li(v0, Operand(LESS)); // Things aren't greater than themselves.
} else {
__ mov(v0, zero_reg); // Things are <=, >=, ==, === themselves.
}
// For less and greater we don't have to check for NaN since the result of
// x < x is false regardless. For the others here is some code to check
// for NaN.
if (cc != lt && cc != gt) {
__ bind(&heap_number);
// It is a heap number, so return non-equal if it's NaN and equal if it's
// not NaN.
// The representation of NaN values has all exponent bits (52..62) set,
// and not all mantissa bits (0..51) clear.
// Read top bits of double representation (second word of value).
__ lw(t2, FieldMemOperand(a0, HeapNumber::kExponentOffset));
// Test that exponent bits are all set.
__ And(t3, t2, Operand(exp_mask_reg));
// If all bits not set (ne cond), then not a NaN, objects are equal.
__ Branch(&return_equal, ne, t3, Operand(exp_mask_reg));
// Shift out flag and all exponent bits, retaining only mantissa.
__ sll(t2, t2, HeapNumber::kNonMantissaBitsInTopWord);
// Or with all low-bits of mantissa.
__ lw(t3, FieldMemOperand(a0, HeapNumber::kMantissaOffset));
__ Or(v0, t3, Operand(t2));
// For equal we already have the right value in v0: Return zero (equal)
// if all bits in mantissa are zero (it's an Infinity) and non-zero if
// not (it's a NaN). For <= and >= we need to load v0 with the failing
// value if it's a NaN.
if (cc != eq) {
// All-zero means Infinity means equal.
__ Ret(eq, v0, Operand(zero_reg));
ASSERT(is_int16(GREATER) && is_int16(LESS));
__ Ret(USE_DELAY_SLOT);
if (cc == le) {
__ li(v0, Operand(GREATER)); // NaN <= NaN should fail.
} else {
__ li(v0, Operand(LESS)); // NaN >= NaN should fail.
}
}
}
// No fall through here.
__ bind(&not_identical);
}
static void EmitSmiNonsmiComparison(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* both_loaded_as_doubles,
Label* slow,
bool strict) {
ASSERT((lhs.is(a0) && rhs.is(a1)) ||
(lhs.is(a1) && rhs.is(a0)));
Label lhs_is_smi;
__ JumpIfSmi(lhs, &lhs_is_smi);
// Rhs is a Smi.
// Check whether the non-smi is a heap number.
__ GetObjectType(lhs, t4, t4);
if (strict) {
// If lhs was not a number and rhs was a Smi then strict equality cannot
// succeed. Return non-equal (lhs is already not zero).
__ Ret(USE_DELAY_SLOT, ne, t4, Operand(HEAP_NUMBER_TYPE));
__ mov(v0, lhs);
} else {
// Smi compared non-strictly with a non-Smi non-heap-number. Call
// the runtime.
__ Branch(slow, ne, t4, Operand(HEAP_NUMBER_TYPE));
}
// Rhs is a smi, lhs is a number.
// Convert smi rhs to double.
__ sra(at, rhs, kSmiTagSize);
__ mtc1(at, f14);
__ cvt_d_w(f14, f14);
__ ldc1(f12, FieldMemOperand(lhs, HeapNumber::kValueOffset));
// We now have both loaded as doubles.
__ jmp(both_loaded_as_doubles);
__ bind(&lhs_is_smi);
// Lhs is a Smi. Check whether the non-smi is a heap number.
__ GetObjectType(rhs, t4, t4);
if (strict) {
// If lhs was not a number and rhs was a Smi then strict equality cannot
// succeed. Return non-equal.
__ Ret(USE_DELAY_SLOT, ne, t4, Operand(HEAP_NUMBER_TYPE));
__ li(v0, Operand(1));
} else {
// Smi compared non-strictly with a non-Smi non-heap-number. Call
// the runtime.
__ Branch(slow, ne, t4, Operand(HEAP_NUMBER_TYPE));
}
// Lhs is a smi, rhs is a number.
// Convert smi lhs to double.
__ sra(at, lhs, kSmiTagSize);
__ mtc1(at, f12);
__ cvt_d_w(f12, f12);
__ ldc1(f14, FieldMemOperand(rhs, HeapNumber::kValueOffset));
// Fall through to both_loaded_as_doubles.
}
static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm,
Register lhs,
Register rhs) {
// If either operand is a JS object or an oddball value, then they are
// not equal since their pointers are different.
// There is no test for undetectability in strict equality.
STATIC_ASSERT(LAST_TYPE == LAST_SPEC_OBJECT_TYPE);
Label first_non_object;
// Get the type of the first operand into a2 and compare it with
// FIRST_SPEC_OBJECT_TYPE.
__ GetObjectType(lhs, a2, a2);
__ Branch(&first_non_object, less, a2, Operand(FIRST_SPEC_OBJECT_TYPE));
// Return non-zero.
Label return_not_equal;
__ bind(&return_not_equal);
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(1));
__ bind(&first_non_object);
// Check for oddballs: true, false, null, undefined.
__ Branch(&return_not_equal, eq, a2, Operand(ODDBALL_TYPE));
__ GetObjectType(rhs, a3, a3);
__ Branch(&return_not_equal, greater, a3, Operand(FIRST_SPEC_OBJECT_TYPE));
// Check for oddballs: true, false, null, undefined.
__ Branch(&return_not_equal, eq, a3, Operand(ODDBALL_TYPE));
// Now that we have the types we might as well check for
// internalized-internalized.
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ Or(a2, a2, Operand(a3));
__ And(at, a2, Operand(kIsNotStringMask | kIsNotInternalizedMask));
__ Branch(&return_not_equal, eq, at, Operand(zero_reg));
}
static void EmitCheckForTwoHeapNumbers(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* both_loaded_as_doubles,
Label* not_heap_numbers,
Label* slow) {
__ GetObjectType(lhs, a3, a2);
__ Branch(not_heap_numbers, ne, a2, Operand(HEAP_NUMBER_TYPE));
__ lw(a2, FieldMemOperand(rhs, HeapObject::kMapOffset));
// If first was a heap number & second wasn't, go to slow case.
__ Branch(slow, ne, a3, Operand(a2));
// Both are heap numbers. Load them up then jump to the code we have
// for that.
__ ldc1(f12, FieldMemOperand(lhs, HeapNumber::kValueOffset));
__ ldc1(f14, FieldMemOperand(rhs, HeapNumber::kValueOffset));
__ jmp(both_loaded_as_doubles);
}
// Fast negative check for internalized-to-internalized equality.
static void EmitCheckForInternalizedStringsOrObjects(MacroAssembler* masm,
Register lhs,
Register rhs,
Label* possible_strings,
Label* not_both_strings) {
ASSERT((lhs.is(a0) && rhs.is(a1)) ||
(lhs.is(a1) && rhs.is(a0)));
// a2 is object type of rhs.
Label object_test;
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ And(at, a2, Operand(kIsNotStringMask));
__ Branch(&object_test, ne, at, Operand(zero_reg));
__ And(at, a2, Operand(kIsNotInternalizedMask));
__ Branch(possible_strings, ne, at, Operand(zero_reg));
__ GetObjectType(rhs, a3, a3);
__ Branch(not_both_strings, ge, a3, Operand(FIRST_NONSTRING_TYPE));
__ And(at, a3, Operand(kIsNotInternalizedMask));
__ Branch(possible_strings, ne, at, Operand(zero_reg));
// Both are internalized strings. We already checked they weren't the same
// pointer so they are not equal.
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(1)); // Non-zero indicates not equal.
__ bind(&object_test);
__ Branch(not_both_strings, lt, a2, Operand(FIRST_SPEC_OBJECT_TYPE));
__ GetObjectType(rhs, a2, a3);
__ Branch(not_both_strings, lt, a3, Operand(FIRST_SPEC_OBJECT_TYPE));
// If both objects are undetectable, they are equal. Otherwise, they
// are not equal, since they are different objects and an object is not
// equal to undefined.
__ lw(a3, FieldMemOperand(lhs, HeapObject::kMapOffset));
__ lbu(a2, FieldMemOperand(a2, Map::kBitFieldOffset));
__ lbu(a3, FieldMemOperand(a3, Map::kBitFieldOffset));
__ and_(a0, a2, a3);
__ And(a0, a0, Operand(1 << Map::kIsUndetectable));
__ Ret(USE_DELAY_SLOT);
__ xori(v0, a0, 1 << Map::kIsUndetectable);
}
static void ICCompareStub_CheckInputType(MacroAssembler* masm,
Register input,
Register scratch,
CompareIC::State expected,
Label* fail) {
Label ok;
if (expected == CompareIC::SMI) {
__ JumpIfNotSmi(input, fail);
} else if (expected == CompareIC::NUMBER) {
__ JumpIfSmi(input, &ok);
__ CheckMap(input, scratch, Heap::kHeapNumberMapRootIndex, fail,
DONT_DO_SMI_CHECK);
}
// We could be strict about internalized/string here, but as long as
// hydrogen doesn't care, the stub doesn't have to care either.
__ bind(&ok);
}
// On entry a1 and a2 are the values to be compared.
// On exit a0 is 0, positive or negative to indicate the result of
// the comparison.
void ICCompareStub::GenerateGeneric(MacroAssembler* masm) {
Register lhs = a1;
Register rhs = a0;
Condition cc = GetCondition();
Label miss;
ICCompareStub_CheckInputType(masm, lhs, a2, left_, &miss);
ICCompareStub_CheckInputType(masm, rhs, a3, right_, &miss);
Label slow; // Call builtin.
Label not_smis, both_loaded_as_doubles;
Label not_two_smis, smi_done;
__ Or(a2, a1, a0);
__ JumpIfNotSmi(a2, &not_two_smis);
__ sra(a1, a1, 1);
__ sra(a0, a0, 1);
__ Ret(USE_DELAY_SLOT);
__ subu(v0, a1, a0);
__ bind(&not_two_smis);
// NOTICE! This code is only reached after a smi-fast-case check, so
// it is certain that at least one operand isn't a smi.
// Handle the case where the objects are identical. Either returns the answer
// or goes to slow. Only falls through if the objects were not identical.
EmitIdenticalObjectComparison(masm, &slow, cc);
// If either is a Smi (we know that not both are), then they can only
// be strictly equal if the other is a HeapNumber.
STATIC_ASSERT(kSmiTag == 0);
ASSERT_EQ(0, Smi::FromInt(0));
__ And(t2, lhs, Operand(rhs));
__ JumpIfNotSmi(t2, &not_smis, t0);
// One operand is a smi. EmitSmiNonsmiComparison generates code that can:
// 1) Return the answer.
// 2) Go to slow.
// 3) Fall through to both_loaded_as_doubles.
// 4) Jump to rhs_not_nan.
// In cases 3 and 4 we have found out we were dealing with a number-number
// comparison and the numbers have been loaded into f12 and f14 as doubles,
// or in GP registers (a0, a1, a2, a3) depending on the presence of the FPU.
EmitSmiNonsmiComparison(masm, lhs, rhs,
&both_loaded_as_doubles, &slow, strict());
__ bind(&both_loaded_as_doubles);
// f12, f14 are the double representations of the left hand side
// and the right hand side if we have FPU. Otherwise a2, a3 represent
// left hand side and a0, a1 represent right hand side.
Isolate* isolate = masm->isolate();
Label nan;
__ li(t0, Operand(LESS));
__ li(t1, Operand(GREATER));
__ li(t2, Operand(EQUAL));
// Check if either rhs or lhs is NaN.
__ BranchF(NULL, &nan, eq, f12, f14);
// Check if LESS condition is satisfied. If true, move conditionally
// result to v0.
__ c(OLT, D, f12, f14);
__ Movt(v0, t0);
// Use previous check to store conditionally to v0 oposite condition
// (GREATER). If rhs is equal to lhs, this will be corrected in next
// check.
__ Movf(v0, t1);
// Check if EQUAL condition is satisfied. If true, move conditionally
// result to v0.
__ c(EQ, D, f12, f14);
__ Movt(v0, t2);
__ Ret();
__ bind(&nan);
// NaN comparisons always fail.
// Load whatever we need in v0 to make the comparison fail.
ASSERT(is_int16(GREATER) && is_int16(LESS));
__ Ret(USE_DELAY_SLOT);
if (cc == lt || cc == le) {
__ li(v0, Operand(GREATER));
} else {
__ li(v0, Operand(LESS));
}
__ bind(&not_smis);
// At this point we know we are dealing with two different objects,
// and neither of them is a Smi. The objects are in lhs_ and rhs_.
if (strict()) {
// This returns non-equal for some object types, or falls through if it
// was not lucky.
EmitStrictTwoHeapObjectCompare(masm, lhs, rhs);
}
Label check_for_internalized_strings;
Label flat_string_check;
// Check for heap-number-heap-number comparison. Can jump to slow case,
// or load both doubles and jump to the code that handles
// that case. If the inputs are not doubles then jumps to
// check_for_internalized_strings.
// In this case a2 will contain the type of lhs_.
EmitCheckForTwoHeapNumbers(masm,
lhs,
rhs,
&both_loaded_as_doubles,
&check_for_internalized_strings,
&flat_string_check);
__ bind(&check_for_internalized_strings);
if (cc == eq && !strict()) {
// Returns an answer for two internalized strings or two
// detectable objects.
// Otherwise jumps to string case or not both strings case.
// Assumes that a2 is the type of lhs_ on entry.
EmitCheckForInternalizedStringsOrObjects(
masm, lhs, rhs, &flat_string_check, &slow);
}
// Check for both being sequential ASCII strings, and inline if that is the
// case.
__ bind(&flat_string_check);
__ JumpIfNonSmisNotBothSequentialAsciiStrings(lhs, rhs, a2, a3, &slow);
__ IncrementCounter(isolate->counters()->string_compare_native(), 1, a2, a3);
if (cc == eq) {
StringCompareStub::GenerateFlatAsciiStringEquals(masm,
lhs,
rhs,
a2,
a3,
t0);
} else {
StringCompareStub::GenerateCompareFlatAsciiStrings(masm,
lhs,
rhs,
a2,
a3,
t0,
t1);
}
// Never falls through to here.
__ bind(&slow);
// Prepare for call to builtin. Push object pointers, a0 (lhs) first,
// a1 (rhs) second.
__ Push(lhs, rhs);
// Figure out which native to call and setup the arguments.
Builtins::JavaScript native;
if (cc == eq) {
native = strict() ? Builtins::STRICT_EQUALS : Builtins::EQUALS;
} else {
native = Builtins::COMPARE;
int ncr; // NaN compare result.
if (cc == lt || cc == le) {
ncr = GREATER;
} else {
ASSERT(cc == gt || cc == ge); // Remaining cases.
ncr = LESS;
}
__ li(a0, Operand(Smi::FromInt(ncr)));
__ push(a0);
}
// Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ InvokeBuiltin(native, JUMP_FUNCTION);
__ bind(&miss);
GenerateMiss(masm);
}
void StoreRegistersStateStub::Generate(MacroAssembler* masm) {
__ mov(t9, ra);
__ pop(ra);
if (save_doubles_ == kSaveFPRegs) {
__ PushSafepointRegistersAndDoubles();
} else {
__ PushSafepointRegisters();
}
__ Jump(t9);
}
void RestoreRegistersStateStub::Generate(MacroAssembler* masm) {
__ mov(t9, ra);
__ pop(ra);
__ StoreToSafepointRegisterSlot(t9, t9);
if (save_doubles_ == kSaveFPRegs) {
__ PopSafepointRegistersAndDoubles();
} else {
__ PopSafepointRegisters();
}
__ Jump(t9);
}
void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
// We don't allow a GC during a store buffer overflow so there is no need to
// store the registers in any particular way, but we do have to store and
// restore them.
__ MultiPush(kJSCallerSaved | ra.bit());
if (save_doubles_ == kSaveFPRegs) {
__ MultiPushFPU(kCallerSavedFPU);
}
const int argument_count = 1;
const int fp_argument_count = 0;
const Register scratch = a1;
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(argument_count, fp_argument_count, scratch);
__ li(a0, Operand(ExternalReference::isolate_address(masm->isolate())));
__ CallCFunction(
ExternalReference::store_buffer_overflow_function(masm->isolate()),
argument_count);
if (save_doubles_ == kSaveFPRegs) {
__ MultiPopFPU(kCallerSavedFPU);
}
__ MultiPop(kJSCallerSaved | ra.bit());
__ Ret();
}
void MathPowStub::Generate(MacroAssembler* masm) {
const Register base = a1;
const Register exponent = a2;
const Register heapnumbermap = t1;
const Register heapnumber = v0;
const DoubleRegister double_base = f2;
const DoubleRegister double_exponent = f4;
const DoubleRegister double_result = f0;
const DoubleRegister double_scratch = f6;
const FPURegister single_scratch = f8;
const Register scratch = t5;
const Register scratch2 = t3;
Label call_runtime, done, int_exponent;
if (exponent_type_ == ON_STACK) {
Label base_is_smi, unpack_exponent;
// The exponent and base are supplied as arguments on the stack.
// This can only happen if the stub is called from non-optimized code.
// Load input parameters from stack to double registers.
__ lw(base, MemOperand(sp, 1 * kPointerSize));
__ lw(exponent, MemOperand(sp, 0 * kPointerSize));
__ LoadRoot(heapnumbermap, Heap::kHeapNumberMapRootIndex);
__ UntagAndJumpIfSmi(scratch, base, &base_is_smi);
__ lw(scratch, FieldMemOperand(base, JSObject::kMapOffset));
__ Branch(&call_runtime, ne, scratch, Operand(heapnumbermap));
__ ldc1(double_base, FieldMemOperand(base, HeapNumber::kValueOffset));
__ jmp(&unpack_exponent);
__ bind(&base_is_smi);
__ mtc1(scratch, single_scratch);
__ cvt_d_w(double_base, single_scratch);
__ bind(&unpack_exponent);
__ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
__ lw(scratch, FieldMemOperand(exponent, JSObject::kMapOffset));
__ Branch(&call_runtime, ne, scratch, Operand(heapnumbermap));
__ ldc1(double_exponent,
FieldMemOperand(exponent, HeapNumber::kValueOffset));
} else if (exponent_type_ == TAGGED) {
// Base is already in double_base.
__ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
__ ldc1(double_exponent,
FieldMemOperand(exponent, HeapNumber::kValueOffset));
}
if (exponent_type_ != INTEGER) {
Label int_exponent_convert;
// Detect integer exponents stored as double.
__ EmitFPUTruncate(kRoundToMinusInf,
scratch,
double_exponent,
at,
double_scratch,
scratch2,
kCheckForInexactConversion);
// scratch2 == 0 means there was no conversion error.
__ Branch(&int_exponent_convert, eq, scratch2, Operand(zero_reg));
if (exponent_type_ == ON_STACK) {
// Detect square root case. Crankshaft detects constant +/-0.5 at
// compile time and uses DoMathPowHalf instead. We then skip this check
// for non-constant cases of +/-0.5 as these hardly occur.
Label not_plus_half;
// Test for 0.5.
__ Move(double_scratch, 0.5);
__ BranchF(USE_DELAY_SLOT,
&not_plus_half,
NULL,
ne,
double_exponent,
double_scratch);
// double_scratch can be overwritten in the delay slot.
// Calculates square root of base. Check for the special case of
// Math.pow(-Infinity, 0.5) == Infinity (ECMA spec, 15.8.2.13).
__ Move(double_scratch, -V8_INFINITY);
__ BranchF(USE_DELAY_SLOT, &done, NULL, eq, double_base, double_scratch);
__ neg_d(double_result, double_scratch);
// Add +0 to convert -0 to +0.
__ add_d(double_scratch, double_base, kDoubleRegZero);
__ sqrt_d(double_result, double_scratch);
__ jmp(&done);
__ bind(&not_plus_half);
__ Move(double_scratch, -0.5);
__ BranchF(USE_DELAY_SLOT,
&call_runtime,
NULL,
ne,
double_exponent,
double_scratch);
// double_scratch can be overwritten in the delay slot.
// Calculates square root of base. Check for the special case of
// Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
__ Move(double_scratch, -V8_INFINITY);
__ BranchF(USE_DELAY_SLOT, &done, NULL, eq, double_base, double_scratch);
__ Move(double_result, kDoubleRegZero);
// Add +0 to convert -0 to +0.
__ add_d(double_scratch, double_base, kDoubleRegZero);
__ Move(double_result, 1);
__ sqrt_d(double_scratch, double_scratch);
__ div_d(double_result, double_result, double_scratch);
__ jmp(&done);
}
__ push(ra);
{
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(0, 2, scratch2);
__ MovToFloatParameters(double_base, double_exponent);
__ CallCFunction(
ExternalReference::power_double_double_function(masm->isolate()),
0, 2);
}
__ pop(ra);
__ MovFromFloatResult(double_result);
__ jmp(&done);
__ bind(&int_exponent_convert);
}
// Calculate power with integer exponent.
__ bind(&int_exponent);
// Get two copies of exponent in the registers scratch and exponent.
if (exponent_type_ == INTEGER) {
__ mov(scratch, exponent);
} else {
// Exponent has previously been stored into scratch as untagged integer.
__ mov(exponent, scratch);
}
__ mov_d(double_scratch, double_base); // Back up base.
__ Move(double_result, 1.0);
// Get absolute value of exponent.
Label positive_exponent;
__ Branch(&positive_exponent, ge, scratch, Operand(zero_reg));
__ Subu(scratch, zero_reg, scratch);
__ bind(&positive_exponent);
Label while_true, no_carry, loop_end;
__ bind(&while_true);
__ And(scratch2, scratch, 1);
__ Branch(&no_carry, eq, scratch2, Operand(zero_reg));
__ mul_d(double_result, double_result, double_scratch);
__ bind(&no_carry);
__ sra(scratch, scratch, 1);
__ Branch(&loop_end, eq, scratch, Operand(zero_reg));
__ mul_d(double_scratch, double_scratch, double_scratch);
__ Branch(&while_true);
__ bind(&loop_end);
__ Branch(&done, ge, exponent, Operand(zero_reg));
__ Move(double_scratch, 1.0);
__ div_d(double_result, double_scratch, double_result);
// Test whether result is zero. Bail out to check for subnormal result.
// Due to subnormals, x^-y == (1/x)^y does not hold in all cases.
__ BranchF(&done, NULL, ne, double_result, kDoubleRegZero);
// double_exponent may not contain the exponent value if the input was a
// smi. We set it with exponent value before bailing out.
__ mtc1(exponent, single_scratch);
__ cvt_d_w(double_exponent, single_scratch);
// Returning or bailing out.
Counters* counters = masm->isolate()->counters();
if (exponent_type_ == ON_STACK) {
// The arguments are still on the stack.
__ bind(&call_runtime);
__ TailCallRuntime(Runtime::kMath_pow_cfunction, 2, 1);
// The stub is called from non-optimized code, which expects the result
// as heap number in exponent.
__ bind(&done);
__ AllocateHeapNumber(
heapnumber, scratch, scratch2, heapnumbermap, &call_runtime);
__ sdc1(double_result,
FieldMemOperand(heapnumber, HeapNumber::kValueOffset));
ASSERT(heapnumber.is(v0));
__ IncrementCounter(counters->math_pow(), 1, scratch, scratch2);
__ DropAndRet(2);
} else {
__ push(ra);
{
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(0, 2, scratch);
__ MovToFloatParameters(double_base, double_exponent);
__ CallCFunction(
ExternalReference::power_double_double_function(masm->isolate()),
0, 2);
}
__ pop(ra);
__ MovFromFloatResult(double_result);
__ bind(&done);
__ IncrementCounter(counters->math_pow(), 1, scratch, scratch2);
__ Ret();
}
}
bool CEntryStub::NeedsImmovableCode() {
return true;
}
void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
CEntryStub::GenerateAheadOfTime(isolate);
WriteInt32ToHeapNumberStub::GenerateFixedRegStubsAheadOfTime(isolate);
StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(isolate);
StubFailureTrampolineStub::GenerateAheadOfTime(isolate);
ArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
CreateAllocationSiteStub::GenerateAheadOfTime(isolate);
BinaryOpICStub::GenerateAheadOfTime(isolate);
StoreRegistersStateStub::GenerateAheadOfTime(isolate);
RestoreRegistersStateStub::GenerateAheadOfTime(isolate);
BinaryOpICWithAllocationSiteStub::GenerateAheadOfTime(isolate);
}
void StoreRegistersStateStub::GenerateAheadOfTime(
Isolate* isolate) {
StoreRegistersStateStub stub1(kDontSaveFPRegs);
stub1.GetCode(isolate);
// Hydrogen code stubs need stub2 at snapshot time.
StoreRegistersStateStub stub2(kSaveFPRegs);
stub2.GetCode(isolate);
}
void RestoreRegistersStateStub::GenerateAheadOfTime(
Isolate* isolate) {
RestoreRegistersStateStub stub1(kDontSaveFPRegs);
stub1.GetCode(isolate);
// Hydrogen code stubs need stub2 at snapshot time.
RestoreRegistersStateStub stub2(kSaveFPRegs);
stub2.GetCode(isolate);
}
void CodeStub::GenerateFPStubs(Isolate* isolate) {
SaveFPRegsMode mode = kSaveFPRegs;
CEntryStub save_doubles(1, mode);
StoreBufferOverflowStub stub(mode);
// These stubs might already be in the snapshot, detect that and don't
// regenerate, which would lead to code stub initialization state being messed
// up.
Code* save_doubles_code;
if (!save_doubles.FindCodeInCache(&save_doubles_code, isolate)) {
save_doubles_code = *save_doubles.GetCode(isolate);
}
Code* store_buffer_overflow_code;
if (!stub.FindCodeInCache(&store_buffer_overflow_code, isolate)) {
store_buffer_overflow_code = *stub.GetCode(isolate);
}
isolate->set_fp_stubs_generated(true);
}
void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
CEntryStub stub(1, kDontSaveFPRegs);
stub.GetCode(isolate);
}
static void JumpIfOOM(MacroAssembler* masm,
Register value,
Register scratch,
Label* oom_label) {
STATIC_ASSERT(Failure::OUT_OF_MEMORY_EXCEPTION == 3);
STATIC_ASSERT(kFailureTag == 3);
__ andi(scratch, value, 0xf);
__ Branch(oom_label, eq, scratch, Operand(0xf));
}
void CEntryStub::GenerateCore(MacroAssembler* masm,
Label* throw_normal_exception,
Label* throw_termination_exception,
Label* throw_out_of_memory_exception,
bool do_gc,
bool always_allocate) {
// v0: result parameter for PerformGC, if any
// s0: number of arguments including receiver (C callee-saved)
// s1: pointer to the first argument (C callee-saved)
// s2: pointer to builtin function (C callee-saved)
Isolate* isolate = masm->isolate();
if (do_gc) {
// Move result passed in v0 into a0 to call PerformGC.
__ mov(a0, v0);
__ PrepareCallCFunction(2, 0, a1);
__ li(a1, Operand(ExternalReference::isolate_address(masm->isolate())));
__ CallCFunction(ExternalReference::perform_gc_function(isolate), 2, 0);
}
ExternalReference scope_depth =
ExternalReference::heap_always_allocate_scope_depth(isolate);
if (always_allocate) {
__ li(a0, Operand(scope_depth));
__ lw(a1, MemOperand(a0));
__ Addu(a1, a1, Operand(1));
__ sw(a1, MemOperand(a0));
}
// Prepare arguments for C routine.
// a0 = argc
__ mov(a0, s0);
// a1 = argv (set in the delay slot after find_ra below).
// We are calling compiled C/C++ code. a0 and a1 hold our two arguments. We
// also need to reserve the 4 argument slots on the stack.
__ AssertStackIsAligned();
__ li(a2, Operand(ExternalReference::isolate_address(isolate)));
// To let the GC traverse the return address of the exit frames, we need to
// know where the return address is. The CEntryStub is unmovable, so
// we can store the address on the stack to be able to find it again and
// we never have to restore it, because it will not change.
{ Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm);
// This branch-and-link sequence is needed to find the current PC on mips,
// saved to the ra register.
// Use masm-> here instead of the double-underscore macro since extra
// coverage code can interfere with the proper calculation of ra.
Label find_ra;
masm->bal(&find_ra); // bal exposes branch delay slot.
masm->mov(a1, s1);
masm->bind(&find_ra);
// Adjust the value in ra to point to the correct return location, 2nd
// instruction past the real call into C code (the jalr(t9)), and push it.
// This is the return address of the exit frame.
const int kNumInstructionsToJump = 5;
masm->Addu(ra, ra, kNumInstructionsToJump * kPointerSize);
masm->sw(ra, MemOperand(sp)); // This spot was reserved in EnterExitFrame.
// Stack space reservation moved to the branch delay slot below.
// Stack is still aligned.
// Call the C routine.
masm->mov(t9, s2); // Function pointer to t9 to conform to ABI for PIC.
masm->jalr(t9);
// Set up sp in the delay slot.
masm->addiu(sp, sp, -kCArgsSlotsSize);
// Make sure the stored 'ra' points to this position.
ASSERT_EQ(kNumInstructionsToJump,
masm->InstructionsGeneratedSince(&find_ra));
}
if (always_allocate) {
// It's okay to clobber a2 and a3 here. v0 & v1 contain result.
__ li(a2, Operand(scope_depth));
__ lw(a3, MemOperand(a2));
__ Subu(a3, a3, Operand(1));
__ sw(a3, MemOperand(a2));
}
// Check for failure result.
Label failure_returned;
STATIC_ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0);
__ addiu(a2, v0, 1);
__ andi(t0, a2, kFailureTagMask);
__ Branch(USE_DELAY_SLOT, &failure_returned, eq, t0, Operand(zero_reg));
// Restore stack (remove arg slots) in branch delay slot.
__ addiu(sp, sp, kCArgsSlotsSize);
// Exit C frame and return.
// v0:v1: result
// sp: stack pointer
// fp: frame pointer
__ LeaveExitFrame(save_doubles_, s0, true, EMIT_RETURN);
// Check if we should retry or throw exception.
Label retry;
__ bind(&failure_returned);
STATIC_ASSERT(Failure::RETRY_AFTER_GC == 0);
__ andi(t0, v0, ((1 << kFailureTypeTagSize) - 1) << kFailureTagSize);
__ Branch(&retry, eq, t0, Operand(zero_reg));
// Special handling of out of memory exceptions.
JumpIfOOM(masm, v0, t0, throw_out_of_memory_exception);
// Retrieve the pending exception.
__ li(t0, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ lw(v0, MemOperand(t0));
// See if we just retrieved an OOM exception.
JumpIfOOM(masm, v0, t0, throw_out_of_memory_exception);
// Clear the pending exception.
__ li(a3, Operand(isolate->factory()->the_hole_value()));
__ li(t0, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ sw(a3, MemOperand(t0));
// Special handling of termination exceptions which are uncatchable
// by javascript code.
__ LoadRoot(t0, Heap::kTerminationExceptionRootIndex);
__ Branch(throw_termination_exception, eq, v0, Operand(t0));
// Handle normal exception.
__ jmp(throw_normal_exception);
__ bind(&retry);
// Last failure (v0) will be moved to (a0) for parameter when retrying.
}
void CEntryStub::Generate(MacroAssembler* masm) {
// Called from JavaScript; parameters are on stack as if calling JS function
// s0: number of arguments including receiver
// s1: size of arguments excluding receiver
// s2: pointer to builtin function
// fp: frame pointer (restored after C call)
// sp: stack pointer (restored as callee's sp after C call)
// cp: current context (C callee-saved)
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// NOTE: Invocations of builtins may return failure objects
// instead of a proper result. The builtin entry handles
// this by performing a garbage collection and retrying the
// builtin once.
// NOTE: s0-s2 hold the arguments of this function instead of a0-a2.
// The reason for this is that these arguments would need to be saved anyway
// so it's faster to set them up directly.
// See MacroAssembler::PrepareCEntryArgs and PrepareCEntryFunction.
// Compute the argv pointer in a callee-saved register.
__ Addu(s1, sp, s1);
// Enter the exit frame that transitions from JavaScript to C++.
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(save_doubles_);
// s0: number of arguments (C callee-saved)
// s1: pointer to first argument (C callee-saved)
// s2: pointer to builtin function (C callee-saved)
Label throw_normal_exception;
Label throw_termination_exception;
Label throw_out_of_memory_exception;
// Call into the runtime system.
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
false,
false);
// Do space-specific GC and retry runtime call.
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
true,
false);
// Do full GC and retry runtime call one final time.
Failure* failure = Failure::InternalError();
__ li(v0, Operand(reinterpret_cast<int32_t>(failure)));
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
true,
true);
__ bind(&throw_out_of_memory_exception);
// Set external caught exception to false.
Isolate* isolate = masm->isolate();
ExternalReference external_caught(Isolate::kExternalCaughtExceptionAddress,
isolate);
__ li(a0, Operand(false, RelocInfo::NONE32));
__ li(a2, Operand(external_caught));
__ sw(a0, MemOperand(a2));
// Set pending exception and v0 to out of memory exception.
Label already_have_failure;
JumpIfOOM(masm, v0, t0, &already_have_failure);
Failure* out_of_memory = Failure::OutOfMemoryException(0x1);
__ li(v0, Operand(reinterpret_cast<int32_t>(out_of_memory)));
__ bind(&already_have_failure);
__ li(a2, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ sw(v0, MemOperand(a2));
// Fall through to the next label.
__ bind(&throw_termination_exception);
__ ThrowUncatchable(v0);
__ bind(&throw_normal_exception);
__ Throw(v0);
}
void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
Label invoke, handler_entry, exit;
Isolate* isolate = masm->isolate();
// Registers:
// a0: entry address
// a1: function
// a2: receiver
// a3: argc
//
// Stack:
// 4 args slots
// args
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// Save callee saved registers on the stack.
__ MultiPush(kCalleeSaved | ra.bit());
// Save callee-saved FPU registers.
__ MultiPushFPU(kCalleeSavedFPU);
// Set up the reserved register for 0.0.
__ Move(kDoubleRegZero, 0.0);
// Load argv in s0 register.
int offset_to_argv = (kNumCalleeSaved + 1) * kPointerSize;
offset_to_argv += kNumCalleeSavedFPU * kDoubleSize;
__ InitializeRootRegister();
__ lw(s0, MemOperand(sp, offset_to_argv + kCArgsSlotsSize));
// We build an EntryFrame.
__ li(t3, Operand(-1)); // Push a bad frame pointer to fail if it is used.
int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
__ li(t2, Operand(Smi::FromInt(marker)));
__ li(t1, Operand(Smi::FromInt(marker)));
__ li(t0, Operand(ExternalReference(Isolate::kCEntryFPAddress,
isolate)));
__ lw(t0, MemOperand(t0));
__ Push(t3, t2, t1, t0);
// Set up frame pointer for the frame to be pushed.
__ addiu(fp, sp, -EntryFrameConstants::kCallerFPOffset);
// Registers:
// a0: entry_address
// a1: function
// a2: receiver_pointer
// a3: argc
// s0: argv
//
// Stack:
// caller fp |
// function slot | entry frame
// context slot |
// bad fp (0xff...f) |
// callee saved registers + ra
// 4 args slots
// args
// If this is the outermost JS call, set js_entry_sp value.
Label non_outermost_js;
ExternalReference js_entry_sp(Isolate::kJSEntrySPAddress, isolate);
__ li(t1, Operand(ExternalReference(js_entry_sp)));
__ lw(t2, MemOperand(t1));
__ Branch(&non_outermost_js, ne, t2, Operand(zero_reg));
__ sw(fp, MemOperand(t1));
__ li(t0, Operand(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME)));
Label cont;
__ b(&cont);
__ nop(); // Branch delay slot nop.
__ bind(&non_outermost_js);
__ li(t0, Operand(Smi::FromInt(StackFrame::INNER_JSENTRY_FRAME)));
__ bind(&cont);
__ push(t0);
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ jmp(&invoke);
__ bind(&handler_entry);
handler_offset_ = handler_entry.pos();
// Caught exception: Store result (exception) in the pending exception
// field in the JSEnv and return a failure sentinel. Coming in here the
// fp will be invalid because the PushTryHandler below sets it to 0 to
// signal the existence of the JSEntry frame.
__ li(t0, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ sw(v0, MemOperand(t0)); // We come back from 'invoke'. result is in v0.
__ li(v0, Operand(reinterpret_cast<int32_t>(Failure::Exception())));
__ b(&exit); // b exposes branch delay slot.
__ nop(); // Branch delay slot nop.
// Invoke: Link this frame into the handler chain. There's only one
// handler block in this code object, so its index is 0.
__ bind(&invoke);
__ PushTryHandler(StackHandler::JS_ENTRY, 0);
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the bal(&invoke) above, which
// restores all kCalleeSaved registers (including cp and fp) to their
// saved values before returning a failure to C.
// Clear any pending exceptions.
__ LoadRoot(t1, Heap::kTheHoleValueRootIndex);
__ li(t0, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ sw(t1, MemOperand(t0));
// Invoke the function by calling through JS entry trampoline builtin.
// Notice that we cannot store a reference to the trampoline code directly in
// this stub, because runtime stubs are not traversed when doing GC.
// Registers:
// a0: entry_address
// a1: function
// a2: receiver_pointer
// a3: argc
// s0: argv
//
// Stack:
// handler frame
// entry frame
// callee saved registers + ra
// 4 args slots
// args
if (is_construct) {
ExternalReference construct_entry(Builtins::kJSConstructEntryTrampoline,
isolate);
__ li(t0, Operand(construct_entry));
} else {
ExternalReference entry(Builtins::kJSEntryTrampoline, masm->isolate());
__ li(t0, Operand(entry));
}
__ lw(t9, MemOperand(t0)); // Deref address.
// Call JSEntryTrampoline.
__ addiu(t9, t9, Code::kHeaderSize - kHeapObjectTag);
__ Call(t9);
// Unlink this frame from the handler chain.
__ PopTryHandler();
__ bind(&exit); // v0 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(t1);
__ Branch(&non_outermost_js_2,
ne,
t1,
Operand(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME)));
__ li(t1, Operand(ExternalReference(js_entry_sp)));
__ sw(zero_reg, MemOperand(t1));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(t1);
__ li(t0, Operand(ExternalReference(Isolate::kCEntryFPAddress,
isolate)));
__ sw(t1, MemOperand(t0));
// Reset the stack to the callee saved registers.
__ addiu(sp, sp, -EntryFrameConstants::kCallerFPOffset);
// Restore callee-saved fpu registers.
__ MultiPopFPU(kCalleeSavedFPU);
// Restore callee saved registers from the stack.
__ MultiPop(kCalleeSaved | ra.bit());
// Return.
__ Jump(ra);
}
// Uses registers a0 to t0.
// Expected input (depending on whether args are in registers or on the stack):
// * object: a0 or at sp + 1 * kPointerSize.
// * function: a1 or at sp.
//
// An inlined call site may have been generated before calling this stub.
// In this case the offset to the inline site to patch is passed on the stack,
// in the safepoint slot for register t0.
void InstanceofStub::Generate(MacroAssembler* masm) {
// Call site inlining and patching implies arguments in registers.
ASSERT(HasArgsInRegisters() || !HasCallSiteInlineCheck());
// ReturnTrueFalse is only implemented for inlined call sites.
ASSERT(!ReturnTrueFalseObject() || HasCallSiteInlineCheck());
// Fixed register usage throughout the stub:
const Register object = a0; // Object (lhs).
Register map = a3; // Map of the object.
const Register function = a1; // Function (rhs).
const Register prototype = t0; // Prototype of the function.
const Register inline_site = t5;
const Register scratch = a2;
const int32_t kDeltaToLoadBoolResult = 5 * kPointerSize;
Label slow, loop, is_instance, is_not_instance, not_js_object;
if (!HasArgsInRegisters()) {
__ lw(object, MemOperand(sp, 1 * kPointerSize));
__ lw(function, MemOperand(sp, 0));
}
// Check that the left hand is a JS object and load map.
__ JumpIfSmi(object, &not_js_object);
__ IsObjectJSObjectType(object, map, scratch, &not_js_object);
// If there is a call site cache don't look in the global cache, but do the
// real lookup and update the call site cache.
if (!HasCallSiteInlineCheck()) {
Label miss;
__ LoadRoot(at, Heap::kInstanceofCacheFunctionRootIndex);
__ Branch(&miss, ne, function, Operand(at));
__ LoadRoot(at, Heap::kInstanceofCacheMapRootIndex);
__ Branch(&miss, ne, map, Operand(at));
__ LoadRoot(v0, Heap::kInstanceofCacheAnswerRootIndex);
__ DropAndRet(HasArgsInRegisters() ? 0 : 2);
__ bind(&miss);
}
// Get the prototype of the function.
__ TryGetFunctionPrototype(function, prototype, scratch, &slow, true);
// Check that the function prototype is a JS object.
__ JumpIfSmi(prototype, &slow);
__ IsObjectJSObjectType(prototype, scratch, scratch, &slow);
// Update the global instanceof or call site inlined cache with the current
// map and function. The cached answer will be set when it is known below.
if (!HasCallSiteInlineCheck()) {
__ StoreRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
__ StoreRoot(map, Heap::kInstanceofCacheMapRootIndex);
} else {
ASSERT(HasArgsInRegisters());
// Patch the (relocated) inlined map check.
// The offset was stored in t0 safepoint slot.
// (See LCodeGen::DoDeferredLInstanceOfKnownGlobal).
__ LoadFromSafepointRegisterSlot(scratch, t0);
__ Subu(inline_site, ra, scratch);
// Get the map location in scratch and patch it.
__ GetRelocatedValue(inline_site, scratch, v1); // v1 used as scratch.
__ sw(map, FieldMemOperand(scratch, Cell::kValueOffset));
}
// Register mapping: a3 is object map and t0 is function prototype.
// Get prototype of object into a2.
__ lw(scratch, FieldMemOperand(map, Map::kPrototypeOffset));
// We don't need map any more. Use it as a scratch register.
Register scratch2 = map;
map = no_reg;
// Loop through the prototype chain looking for the function prototype.
__ LoadRoot(scratch2, Heap::kNullValueRootIndex);
__ bind(&loop);
__ Branch(&is_instance, eq, scratch, Operand(prototype));
__ Branch(&is_not_instance, eq, scratch, Operand(scratch2));
__ lw(scratch, FieldMemOperand(scratch, HeapObject::kMapOffset));
__ lw(scratch, FieldMemOperand(scratch, Map::kPrototypeOffset));
__ Branch(&loop);
__ bind(&is_instance);
ASSERT(Smi::FromInt(0) == 0);
if (!HasCallSiteInlineCheck()) {
__ mov(v0, zero_reg);
__ StoreRoot(v0, Heap::kInstanceofCacheAnswerRootIndex);
} else {
// Patch the call site to return true.
__ LoadRoot(v0, Heap::kTrueValueRootIndex);
__ Addu(inline_site, inline_site, Operand(kDeltaToLoadBoolResult));
// Get the boolean result location in scratch and patch it.
__ PatchRelocatedValue(inline_site, scratch, v0);
if (!ReturnTrueFalseObject()) {
ASSERT_EQ(Smi::FromInt(0), 0);
__ mov(v0, zero_reg);
}
}
__ DropAndRet(HasArgsInRegisters() ? 0 : 2);
__ bind(&is_not_instance);
if (!HasCallSiteInlineCheck()) {
__ li(v0, Operand(Smi::FromInt(1)));
__ StoreRoot(v0, Heap::kInstanceofCacheAnswerRootIndex);
} else {
// Patch the call site to return false.
__ LoadRoot(v0, Heap::kFalseValueRootIndex);
__ Addu(inline_site, inline_site, Operand(kDeltaToLoadBoolResult));
// Get the boolean result location in scratch and patch it.
__ PatchRelocatedValue(inline_site, scratch, v0);
if (!ReturnTrueFalseObject()) {
__ li(v0, Operand(Smi::FromInt(1)));
}
}
__ DropAndRet(HasArgsInRegisters() ? 0 : 2);
Label object_not_null, object_not_null_or_smi;
__ bind(&not_js_object);
// Before null, smi and string value checks, check that the rhs is a function
// as for a non-function rhs an exception needs to be thrown.
__ JumpIfSmi(function, &slow);
__ GetObjectType(function, scratch2, scratch);
__ Branch(&slow, ne, scratch, Operand(JS_FUNCTION_TYPE));
// Null is not instance of anything.
__ Branch(&object_not_null,
ne,
scratch,
Operand(masm->isolate()->factory()->null_value()));
__ li(v0, Operand(Smi::FromInt(1)));
__ DropAndRet(HasArgsInRegisters() ? 0 : 2);
__ bind(&object_not_null);
// Smi values are not instances of anything.
__ JumpIfNotSmi(object, &object_not_null_or_smi);
__ li(v0, Operand(Smi::FromInt(1)));
__ DropAndRet(HasArgsInRegisters() ? 0 : 2);
__ bind(&object_not_null_or_smi);
// String values are not instances of anything.
__ IsObjectJSStringType(object, scratch, &slow);
__ li(v0, Operand(Smi::FromInt(1)));
__ DropAndRet(HasArgsInRegisters() ? 0 : 2);
// Slow-case. Tail call builtin.
__ bind(&slow);
if (!ReturnTrueFalseObject()) {
if (HasArgsInRegisters()) {
__ Push(a0, a1);
}
__ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
} else {
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(a0, a1);
__ InvokeBuiltin(Builtins::INSTANCE_OF, CALL_FUNCTION);
}
__ mov(a0, v0);
__ LoadRoot(v0, Heap::kTrueValueRootIndex);
__ DropAndRet(HasArgsInRegisters() ? 0 : 2, eq, a0, Operand(zero_reg));
__ LoadRoot(v0, Heap::kFalseValueRootIndex);
__ DropAndRet(HasArgsInRegisters() ? 0 : 2);
}
}
void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
Label miss;
Register receiver;
if (kind() == Code::KEYED_LOAD_IC) {
// ----------- S t a t e -------------
// -- ra : return address
// -- a0 : key
// -- a1 : receiver
// -----------------------------------
__ Branch(&miss, ne, a0,
Operand(masm->isolate()->factory()->prototype_string()));
receiver = a1;
} else {
ASSERT(kind() == Code::LOAD_IC);
// ----------- S t a t e -------------
// -- a2 : name
// -- ra : return address
// -- a0 : receiver
// -- sp[0] : receiver
// -----------------------------------
receiver = a0;
}
StubCompiler::GenerateLoadFunctionPrototype(masm, receiver, a3, t0, &miss);
__ bind(&miss);
StubCompiler::TailCallBuiltin(
masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
}
void StringLengthStub::Generate(MacroAssembler* masm) {
Label miss;
Register receiver;
if (kind() == Code::KEYED_LOAD_IC) {
// ----------- S t a t e -------------
// -- ra : return address
// -- a0 : key
// -- a1 : receiver
// -----------------------------------
__ Branch(&miss, ne, a0,
Operand(masm->isolate()->factory()->length_string()));
receiver = a1;
} else {
ASSERT(kind() == Code::LOAD_IC);
// ----------- S t a t e -------------
// -- a2 : name
// -- ra : return address
// -- a0 : receiver
// -- sp[0] : receiver
// -----------------------------------
receiver = a0;
}
StubCompiler::GenerateLoadStringLength(masm, receiver, a3, t0, &miss);
__ bind(&miss);
StubCompiler::TailCallBuiltin(
masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
}
void StoreArrayLengthStub::Generate(MacroAssembler* masm) {
// This accepts as a receiver anything JSArray::SetElementsLength accepts
// (currently anything except for external arrays which means anything with
// elements of FixedArray type). Value must be a number, but only smis are
// accepted as the most common case.
Label miss;
Register receiver;
Register value;
if (kind() == Code::KEYED_STORE_IC) {
// ----------- S t a t e -------------
// -- ra : return address
// -- a0 : value
// -- a1 : key
// -- a2 : receiver
// -----------------------------------
__ Branch(&miss, ne, a1,
Operand(masm->isolate()->factory()->length_string()));
receiver = a2;
value = a0;
} else {
ASSERT(kind() == Code::STORE_IC);
// ----------- S t a t e -------------
// -- ra : return address
// -- a0 : value
// -- a1 : receiver
// -- a2 : key
// -----------------------------------
receiver = a1;
value = a0;
}
Register scratch = a3;
// Check that the receiver isn't a smi.
__ JumpIfSmi(receiver, &miss);
// Check that the object is a JS array.
__ GetObjectType(receiver, scratch, scratch);
__ Branch(&miss, ne, scratch, Operand(JS_ARRAY_TYPE));
// Check that elements are FixedArray.
// We rely on StoreIC_ArrayLength below to deal with all types of
// fast elements (including COW).
__ lw(scratch, FieldMemOperand(receiver, JSArray::kElementsOffset));
__ GetObjectType(scratch, scratch, scratch);
__ Branch(&miss, ne, scratch, Operand(FIXED_ARRAY_TYPE));
// Check that the array has fast properties, otherwise the length
// property might have been redefined.
__ lw(scratch, FieldMemOperand(receiver, JSArray::kPropertiesOffset));
__ lw(scratch, FieldMemOperand(scratch, FixedArray::kMapOffset));
__ LoadRoot(at, Heap::kHashTableMapRootIndex);
__ Branch(&miss, eq, scratch, Operand(at));
// Check that value is a smi.
__ JumpIfNotSmi(value, &miss);
// Prepare tail call to StoreIC_ArrayLength.
__ Push(receiver, value);
ExternalReference ref =
ExternalReference(IC_Utility(IC::kStoreIC_ArrayLength), masm->isolate());
__ TailCallExternalReference(ref, 2, 1);
__ bind(&miss);
StubCompiler::TailCallBuiltin(
masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
}
Register InstanceofStub::left() { return a0; }
Register InstanceofStub::right() { return a1; }
void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
// The displacement is the offset of the last parameter (if any)
// relative to the frame pointer.
const int kDisplacement =
StandardFrameConstants::kCallerSPOffset - kPointerSize;
// Check that the key is a smiGenerateReadElement.
Label slow;
__ JumpIfNotSmi(a1, &slow);
// Check if the calling frame is an arguments adaptor frame.
Label adaptor;
__ lw(a2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ lw(a3, MemOperand(a2, StandardFrameConstants::kContextOffset));
__ Branch(&adaptor,
eq,
a3,
Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
// Check index (a1) against formal parameters count limit passed in
// through register a0. Use unsigned comparison to get negative
// check for free.
__ Branch(&slow, hs, a1, Operand(a0));
// Read the argument from the stack and return it.
__ subu(a3, a0, a1);
__ sll(t3, a3, kPointerSizeLog2 - kSmiTagSize);
__ Addu(a3, fp, Operand(t3));
__ Ret(USE_DELAY_SLOT);
__ lw(v0, MemOperand(a3, kDisplacement));
// Arguments adaptor case: Check index (a1) against actual arguments
// limit found in the arguments adaptor frame. Use unsigned
// comparison to get negative check for free.
__ bind(&adaptor);
__ lw(a0, MemOperand(a2, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ Branch(&slow, Ugreater_equal, a1, Operand(a0));
// Read the argument from the adaptor frame and return it.
__ subu(a3, a0, a1);
__ sll(t3, a3, kPointerSizeLog2 - kSmiTagSize);
__ Addu(a3, a2, Operand(t3));
__ Ret(USE_DELAY_SLOT);
__ lw(v0, MemOperand(a3, kDisplacement));
// Slow-case: Handle non-smi or out-of-bounds access to arguments
// by calling the runtime system.
__ bind(&slow);
__ push(a1);
__ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
}
void ArgumentsAccessStub::GenerateNewNonStrictSlow(MacroAssembler* masm) {
// sp[0] : number of parameters
// sp[4] : receiver displacement
// sp[8] : function
// Check if the calling frame is an arguments adaptor frame.
Label runtime;
__ lw(a3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ lw(a2, MemOperand(a3, StandardFrameConstants::kContextOffset));
__ Branch(&runtime,
ne,
a2,
Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
// Patch the arguments.length and the parameters pointer in the current frame.
__ lw(a2, MemOperand(a3, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ sw(a2, MemOperand(sp, 0 * kPointerSize));
__ sll(t3, a2, 1);
__ Addu(a3, a3, Operand(t3));
__ addiu(a3, a3, StandardFrameConstants::kCallerSPOffset);
__ sw(a3, MemOperand(sp, 1 * kPointerSize));
__ bind(&runtime);
__ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
}
void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
// Stack layout:
// sp[0] : number of parameters (tagged)
// sp[4] : address of receiver argument
// sp[8] : function
// Registers used over whole function:
// t2 : allocated object (tagged)
// t5 : mapped parameter count (tagged)
__ lw(a1, MemOperand(sp, 0 * kPointerSize));
// a1 = parameter count (tagged)
// Check if the calling frame is an arguments adaptor frame.
Label runtime;
Label adaptor_frame, try_allocate;
__ lw(a3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ lw(a2, MemOperand(a3, StandardFrameConstants::kContextOffset));
__ Branch(&adaptor_frame,
eq,
a2,
Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
// No adaptor, parameter count = argument count.
__ mov(a2, a1);
__ b(&try_allocate);
__ nop(); // Branch delay slot nop.
// We have an adaptor frame. Patch the parameters pointer.
__ bind(&adaptor_frame);
__ lw(a2, MemOperand(a3, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ sll(t6, a2, 1);
__ Addu(a3, a3, Operand(t6));
__ Addu(a3, a3, Operand(StandardFrameConstants::kCallerSPOffset));
__ sw(a3, MemOperand(sp, 1 * kPointerSize));
// a1 = parameter count (tagged)
// a2 = argument count (tagged)
// Compute the mapped parameter count = min(a1, a2) in a1.
Label skip_min;
__ Branch(&skip_min, lt, a1, Operand(a2));
__ mov(a1, a2);
__ bind(&skip_min);
__ bind(&try_allocate);
// Compute the sizes of backing store, parameter map, and arguments object.
// 1. Parameter map, has 2 extra words containing context and backing store.
const int kParameterMapHeaderSize =
FixedArray::kHeaderSize + 2 * kPointerSize;
// If there are no mapped parameters, we do not need the parameter_map.
Label param_map_size;
ASSERT_EQ(0, Smi::FromInt(0));
__ Branch(USE_DELAY_SLOT, &param_map_size, eq, a1, Operand(zero_reg));
__ mov(t5, zero_reg); // In delay slot: param map size = 0 when a1 == 0.
__ sll(t5, a1, 1);
__ addiu(t5, t5, kParameterMapHeaderSize);
__ bind(&param_map_size);
// 2. Backing store.
__ sll(t6, a2, 1);
__ Addu(t5, t5, Operand(t6));
__ Addu(t5, t5, Operand(FixedArray::kHeaderSize));
// 3. Arguments object.
__ Addu(t5, t5, Operand(Heap::kArgumentsObjectSize));
// Do the allocation of all three objects in one go.
__ Allocate(t5, v0, a3, t0, &runtime, TAG_OBJECT);
// v0 = address of new object(s) (tagged)
// a2 = argument count (tagged)
// Get the arguments boilerplate from the current native context into t0.
const int kNormalOffset =
Context::SlotOffset(Context::ARGUMENTS_BOILERPLATE_INDEX);
const int kAliasedOffset =
Context::SlotOffset(Context::ALIASED_ARGUMENTS_BOILERPLATE_INDEX);
__ lw(t0, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
__ lw(t0, FieldMemOperand(t0, GlobalObject::kNativeContextOffset));
Label skip2_ne, skip2_eq;
__ Branch(&skip2_ne, ne, a1, Operand(zero_reg));
__ lw(t0, MemOperand(t0, kNormalOffset));
__ bind(&skip2_ne);
__ Branch(&skip2_eq, eq, a1, Operand(zero_reg));
__ lw(t0, MemOperand(t0, kAliasedOffset));
__ bind(&skip2_eq);
// v0 = address of new object (tagged)
// a1 = mapped parameter count (tagged)
// a2 = argument count (tagged)
// t0 = address of boilerplate object (tagged)
// Copy the JS object part.
for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
__ lw(a3, FieldMemOperand(t0, i));
__ sw(a3, FieldMemOperand(v0, i));
}
// Set up the callee in-object property.
STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
__ lw(a3, MemOperand(sp, 2 * kPointerSize));
const int kCalleeOffset = JSObject::kHeaderSize +
Heap::kArgumentsCalleeIndex * kPointerSize;
__ sw(a3, FieldMemOperand(v0, kCalleeOffset));
// Use the length (smi tagged) and set that as an in-object property too.
STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
const int kLengthOffset = JSObject::kHeaderSize +
Heap::kArgumentsLengthIndex * kPointerSize;
__ sw(a2, FieldMemOperand(v0, kLengthOffset));
// Set up the elements pointer in the allocated arguments object.
// If we allocated a parameter map, t0 will point there, otherwise
// it will point to the backing store.
__ Addu(t0, v0, Operand(Heap::kArgumentsObjectSize));
__ sw(t0, FieldMemOperand(v0, JSObject::kElementsOffset));
// v0 = address of new object (tagged)
// a1 = mapped parameter count (tagged)
// a2 = argument count (tagged)
// t0 = address of parameter map or backing store (tagged)
// Initialize parameter map. If there are no mapped arguments, we're done.
Label skip_parameter_map;
Label skip3;
__ Branch(&skip3, ne, a1, Operand(Smi::FromInt(0)));
// Move backing store address to a3, because it is
// expected there when filling in the unmapped arguments.
__ mov(a3, t0);
__ bind(&skip3);
__ Branch(&skip_parameter_map, eq, a1, Operand(Smi::FromInt(0)));
__ LoadRoot(t2, Heap::kNonStrictArgumentsElementsMapRootIndex);
__ sw(t2, FieldMemOperand(t0, FixedArray::kMapOffset));
__ Addu(t2, a1, Operand(Smi::FromInt(2)));
__ sw(t2, FieldMemOperand(t0, FixedArray::kLengthOffset));
__ sw(cp, FieldMemOperand(t0, FixedArray::kHeaderSize + 0 * kPointerSize));
__ sll(t6, a1, 1);
__ Addu(t2, t0, Operand(t6));
__ Addu(t2, t2, Operand(kParameterMapHeaderSize));
__ sw(t2, FieldMemOperand(t0, FixedArray::kHeaderSize + 1 * kPointerSize));
// Copy the parameter slots and the holes in the arguments.
// We need to fill in mapped_parameter_count slots. They index the context,
// where parameters are stored in reverse order, at
// MIN_CONTEXT_SLOTS .. MIN_CONTEXT_SLOTS+parameter_count-1
// The mapped parameter thus need to get indices
// MIN_CONTEXT_SLOTS+parameter_count-1 ..
// MIN_CONTEXT_SLOTS+parameter_count-mapped_parameter_count
// We loop from right to left.
Label parameters_loop, parameters_test;
__ mov(t2, a1);
__ lw(t5, MemOperand(sp, 0 * kPointerSize));
__ Addu(t5, t5, Operand(Smi::FromInt(Context::MIN_CONTEXT_SLOTS)));
__ Subu(t5, t5, Operand(a1));
__ LoadRoot(t3, Heap::kTheHoleValueRootIndex);
__ sll(t6, t2, 1);
__ Addu(a3, t0, Operand(t6));
__ Addu(a3, a3, Operand(kParameterMapHeaderSize));
// t2 = loop variable (tagged)
// a1 = mapping index (tagged)
// a3 = address of backing store (tagged)
// t0 = address of parameter map (tagged)
// t1 = temporary scratch (a.o., for address calculation)
// t3 = the hole value
__ jmp(&parameters_test);
__ bind(&parameters_loop);
__ Subu(t2, t2, Operand(Smi::FromInt(1)));
__ sll(t1, t2, 1);
__ Addu(t1, t1, Operand(kParameterMapHeaderSize - kHeapObjectTag));
__ Addu(t6, t0, t1);
__ sw(t5, MemOperand(t6));
__ Subu(t1, t1, Operand(kParameterMapHeaderSize - FixedArray::kHeaderSize));
__ Addu(t6, a3, t1);
__ sw(t3, MemOperand(t6));
__ Addu(t5, t5, Operand(Smi::FromInt(1)));
__ bind(&parameters_test);
__ Branch(&parameters_loop, ne, t2, Operand(Smi::FromInt(0)));
__ bind(&skip_parameter_map);
// a2 = argument count (tagged)
// a3 = address of backing store (tagged)
// t1 = scratch
// Copy arguments header and remaining slots (if there are any).
__ LoadRoot(t1, Heap::kFixedArrayMapRootIndex);
__ sw(t1, FieldMemOperand(a3, FixedArray::kMapOffset));
__ sw(a2, FieldMemOperand(a3, FixedArray::kLengthOffset));
Label arguments_loop, arguments_test;
__ mov(t5, a1);
__ lw(t0, MemOperand(sp, 1 * kPointerSize));
__ sll(t6, t5, 1);
__ Subu(t0, t0, Operand(t6));
__ jmp(&arguments_test);
__ bind(&arguments_loop);
__ Subu(t0, t0, Operand(kPointerSize));
__ lw(t2, MemOperand(t0, 0));
__ sll(t6, t5, 1);
__ Addu(t1, a3, Operand(t6));
__ sw(t2, FieldMemOperand(t1, FixedArray::kHeaderSize));
__ Addu(t5, t5, Operand(Smi::FromInt(1)));
__ bind(&arguments_test);
__ Branch(&arguments_loop, lt, t5, Operand(a2));
// Return and remove the on-stack parameters.
__ DropAndRet(3);
// Do the runtime call to allocate the arguments object.
// a2 = argument count (tagged)
__ bind(&runtime);
__ sw(a2, MemOperand(sp, 0 * kPointerSize)); // Patch argument count.
__ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
}
void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
// sp[0] : number of parameters
// sp[4] : receiver displacement
// sp[8] : function
// Check if the calling frame is an arguments adaptor frame.
Label adaptor_frame, try_allocate, runtime;
__ lw(a2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ lw(a3, MemOperand(a2, StandardFrameConstants::kContextOffset));
__ Branch(&adaptor_frame,
eq,
a3,
Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
// Get the length from the frame.
__ lw(a1, MemOperand(sp, 0));
__ Branch(&try_allocate);
// Patch the arguments.length and the parameters pointer.
__ bind(&adaptor_frame);
__ lw(a1, MemOperand(a2, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ sw(a1, MemOperand(sp, 0));
__ sll(at, a1, kPointerSizeLog2 - kSmiTagSize);
__ Addu(a3, a2, Operand(at));
__ Addu(a3, a3, Operand(StandardFrameConstants::kCallerSPOffset));
__ sw(a3, MemOperand(sp, 1 * kPointerSize));
// Try the new space allocation. Start out with computing the size
// of the arguments object and the elements array in words.
Label add_arguments_object;
__ bind(&try_allocate);
__ Branch(&add_arguments_object, eq, a1, Operand(zero_reg));
__ srl(a1, a1, kSmiTagSize);
__ Addu(a1, a1, Operand(FixedArray::kHeaderSize / kPointerSize));
__ bind(&add_arguments_object);
__ Addu(a1, a1, Operand(Heap::kArgumentsObjectSizeStrict / kPointerSize));
// Do the allocation of both objects in one go.
__ Allocate(a1, v0, a2, a3, &runtime,
static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
// Get the arguments boilerplate from the current native context.
__ lw(t0, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
__ lw(t0, FieldMemOperand(t0, GlobalObject::kNativeContextOffset));
__ lw(t0, MemOperand(t0, Context::SlotOffset(
Context::STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX)));
// Copy the JS object part.
__ CopyFields(v0, t0, a3.bit(), JSObject::kHeaderSize / kPointerSize);
// Get the length (smi tagged) and set that as an in-object property too.
STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
__ lw(a1, MemOperand(sp, 0 * kPointerSize));
__ sw(a1, FieldMemOperand(v0, JSObject::kHeaderSize +
Heap::kArgumentsLengthIndex * kPointerSize));
Label done;
__ Branch(&done, eq, a1, Operand(zero_reg));
// Get the parameters pointer from the stack.
__ lw(a2, MemOperand(sp, 1 * kPointerSize));
// Set up the elements pointer in the allocated arguments object and
// initialize the header in the elements fixed array.
__ Addu(t0, v0, Operand(Heap::kArgumentsObjectSizeStrict));
__ sw(t0, FieldMemOperand(v0, JSObject::kElementsOffset));
__ LoadRoot(a3, Heap::kFixedArrayMapRootIndex);
__ sw(a3, FieldMemOperand(t0, FixedArray::kMapOffset));
__ sw(a1, FieldMemOperand(t0, FixedArray::kLengthOffset));
// Untag the length for the loop.
__ srl(a1, a1, kSmiTagSize);
// Copy the fixed array slots.
Label loop;
// Set up t0 to point to the first array slot.
__ Addu(t0, t0, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ bind(&loop);
// Pre-decrement a2 with kPointerSize on each iteration.
// Pre-decrement in order to skip receiver.
__ Addu(a2, a2, Operand(-kPointerSize));
__ lw(a3, MemOperand(a2));
// Post-increment t0 with kPointerSize on each iteration.
__ sw(a3, MemOperand(t0));
__ Addu(t0, t0, Operand(kPointerSize));
__ Subu(a1, a1, Operand(1));
__ Branch(&loop, ne, a1, Operand(zero_reg));
// Return and remove the on-stack parameters.
__ bind(&done);
__ DropAndRet(3);
// Do the runtime call to allocate the arguments object.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kNewStrictArgumentsFast, 3, 1);
}
void RegExpExecStub::Generate(MacroAssembler* masm) {
// Just jump directly to runtime if native RegExp is not selected at compile
// time or if regexp entry in generated code is turned off runtime switch or
// at compilation.
#ifdef V8_INTERPRETED_REGEXP
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
#else // V8_INTERPRETED_REGEXP
// Stack frame on entry.
// sp[0]: last_match_info (expected JSArray)
// sp[4]: previous index
// sp[8]: subject string
// sp[12]: JSRegExp object
const int kLastMatchInfoOffset = 0 * kPointerSize;
const int kPreviousIndexOffset = 1 * kPointerSize;
const int kSubjectOffset = 2 * kPointerSize;
const int kJSRegExpOffset = 3 * kPointerSize;
Isolate* isolate = masm->isolate();
Label runtime;
// Allocation of registers for this function. These are in callee save
// registers and will be preserved by the call to the native RegExp code, as
// this code is called using the normal C calling convention. When calling
// directly from generated code the native RegExp code will not do a GC and
// therefore the content of these registers are safe to use after the call.
// MIPS - using s0..s2, since we are not using CEntry Stub.
Register subject = s0;
Register regexp_data = s1;
Register last_match_info_elements = s2;
// Ensure that a RegExp stack is allocated.
ExternalReference address_of_regexp_stack_memory_address =
ExternalReference::address_of_regexp_stack_memory_address(
isolate);
ExternalReference address_of_regexp_stack_memory_size =
ExternalReference::address_of_regexp_stack_memory_size(isolate);
__ li(a0, Operand(address_of_regexp_stack_memory_size));
__ lw(a0, MemOperand(a0, 0));
__ Branch(&runtime, eq, a0, Operand(zero_reg));
// Check that the first argument is a JSRegExp object.
__ lw(a0, MemOperand(sp, kJSRegExpOffset));
STATIC_ASSERT(kSmiTag == 0);
__ JumpIfSmi(a0, &runtime);
__ GetObjectType(a0, a1, a1);
__ Branch(&runtime, ne, a1, Operand(JS_REGEXP_TYPE));
// Check that the RegExp has been compiled (data contains a fixed array).
__ lw(regexp_data, FieldMemOperand(a0, JSRegExp::kDataOffset));
if (FLAG_debug_code) {
__ SmiTst(regexp_data, t0);
__ Check(nz,
kUnexpectedTypeForRegExpDataFixedArrayExpected,
t0,
Operand(zero_reg));
__ GetObjectType(regexp_data, a0, a0);
__ Check(eq,
kUnexpectedTypeForRegExpDataFixedArrayExpected,
a0,
Operand(FIXED_ARRAY_TYPE));
}
// regexp_data: RegExp data (FixedArray)
// Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP.
__ lw(a0, FieldMemOperand(regexp_data, JSRegExp::kDataTagOffset));
__ Branch(&runtime, ne, a0, Operand(Smi::FromInt(JSRegExp::IRREGEXP)));
// regexp_data: RegExp data (FixedArray)
// Check that the number of captures fit in the static offsets vector buffer.
__ lw(a2,
FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
// Check (number_of_captures + 1) * 2 <= offsets vector size
// Or number_of_captures * 2 <= offsets vector size - 2
// Multiplying by 2 comes for free since a2 is smi-tagged.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
STATIC_ASSERT(Isolate::kJSRegexpStaticOffsetsVectorSize >= 2);
__ Branch(
&runtime, hi, a2, Operand(Isolate::kJSRegexpStaticOffsetsVectorSize - 2));
// Reset offset for possibly sliced string.
__ mov(t0, zero_reg);
__ lw(subject, MemOperand(sp, kSubjectOffset));
__ JumpIfSmi(subject, &runtime);
__ mov(a3, subject); // Make a copy of the original subject string.
__ lw(a0, FieldMemOperand(subject, HeapObject::kMapOffset));
__ lbu(a0, FieldMemOperand(a0, Map::kInstanceTypeOffset));
// subject: subject string
// a3: subject string
// a0: subject string instance type
// regexp_data: RegExp data (FixedArray)
// Handle subject string according to its encoding and representation:
// (1) Sequential string? If yes, go to (5).
// (2) Anything but sequential or cons? If yes, go to (6).
// (3) Cons string. If the string is flat, replace subject with first string.
// Otherwise bailout.
// (4) Is subject external? If yes, go to (7).
// (5) Sequential string. Load regexp code according to encoding.
// (E) Carry on.
/// [...]
// Deferred code at the end of the stub:
// (6) Not a long external string? If yes, go to (8).
// (7) External string. Make it, offset-wise, look like a sequential string.
// Go to (5).
// (8) Short external string or not a string? If yes, bail out to runtime.
// (9) Sliced string. Replace subject with parent. Go to (4).
Label seq_string /* 5 */, external_string /* 7 */,
check_underlying /* 4 */, not_seq_nor_cons /* 6 */,
not_long_external /* 8 */;
// (1) Sequential string? If yes, go to (5).
__ And(a1,
a0,
Operand(kIsNotStringMask |
kStringRepresentationMask |
kShortExternalStringMask));
STATIC_ASSERT((kStringTag | kSeqStringTag) == 0);
__ Branch(&seq_string, eq, a1, Operand(zero_reg)); // Go to (5).
// (2) Anything but sequential or cons? If yes, go to (6).
STATIC_ASSERT(kConsStringTag < kExternalStringTag);
STATIC_ASSERT(kSlicedStringTag > kExternalStringTag);
STATIC_ASSERT(kIsNotStringMask > kExternalStringTag);
STATIC_ASSERT(kShortExternalStringTag > kExternalStringTag);
// Go to (6).
__ Branch(&not_seq_nor_cons, ge, a1, Operand(kExternalStringTag));
// (3) Cons string. Check that it's flat.
// Replace subject with first string and reload instance type.
__ lw(a0, FieldMemOperand(subject, ConsString::kSecondOffset));
__ LoadRoot(a1, Heap::kempty_stringRootIndex);
__ Branch(&runtime, ne, a0, Operand(a1));
__ lw(subject, FieldMemOperand(subject, ConsString::kFirstOffset));
// (4) Is subject external? If yes, go to (7).
__ bind(&check_underlying);
__ lw(a0, FieldMemOperand(subject, HeapObject::kMapOffset));
__ lbu(a0, FieldMemOperand(a0, Map::kInstanceTypeOffset));
STATIC_ASSERT(kSeqStringTag == 0);
__ And(at, a0, Operand(kStringRepresentationMask));
// The underlying external string is never a short external string.
STATIC_CHECK(ExternalString::kMaxShortLength < ConsString::kMinLength);
STATIC_CHECK(ExternalString::kMaxShortLength < SlicedString::kMinLength);
__ Branch(&external_string, ne, at, Operand(zero_reg)); // Go to (7).
// (5) Sequential string. Load regexp code according to encoding.
__ bind(&seq_string);
// subject: sequential subject string (or look-alike, external string)
// a3: original subject string
// Load previous index and check range before a3 is overwritten. We have to
// use a3 instead of subject here because subject might have been only made
// to look like a sequential string when it actually is an external string.
__ lw(a1, MemOperand(sp, kPreviousIndexOffset));
__ JumpIfNotSmi(a1, &runtime);
__ lw(a3, FieldMemOperand(a3, String::kLengthOffset));
__ Branch(&runtime, ls, a3, Operand(a1));
__ sra(a1, a1, kSmiTagSize); // Untag the Smi.
STATIC_ASSERT(kStringEncodingMask == 4);
STATIC_ASSERT(kOneByteStringTag == 4);
STATIC_ASSERT(kTwoByteStringTag == 0);
__ And(a0, a0, Operand(kStringEncodingMask)); // Non-zero for ASCII.
__ lw(t9, FieldMemOperand(regexp_data, JSRegExp::kDataAsciiCodeOffset));
__ sra(a3, a0, 2); // a3 is 1 for ASCII, 0 for UC16 (used below).
__ lw(t1, FieldMemOperand(regexp_data, JSRegExp::kDataUC16CodeOffset));
__ Movz(t9, t1, a0); // If UC16 (a0 is 0), replace t9 w/kDataUC16CodeOffset.
// (E) Carry on. String handling is done.
// t9: irregexp code
// Check that the irregexp code has been generated for the actual string
// encoding. If it has, the field contains a code object otherwise it contains
// a smi (code flushing support).
__ JumpIfSmi(t9, &runtime);
// a1: previous index
// a3: encoding of subject string (1 if ASCII, 0 if two_byte);
// t9: code
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// All checks done. Now push arguments for native regexp code.
__ IncrementCounter(isolate->counters()->regexp_entry_native(),
1, a0, a2);
// Isolates: note we add an additional parameter here (isolate pointer).
const int kRegExpExecuteArguments = 9;
const int kParameterRegisters = 4;
__ EnterExitFrame(false, kRegExpExecuteArguments - kParameterRegisters);
// Stack pointer now points to cell where return address is to be written.
// Arguments are before that on the stack or in registers, meaning we
// treat the return address as argument 5. Thus every argument after that
// needs to be shifted back by 1. Since DirectCEntryStub will handle
// allocating space for the c argument slots, we don't need to calculate
// that into the argument positions on the stack. This is how the stack will
// look (sp meaning the value of sp at this moment):
// [sp + 5] - Argument 9
// [sp + 4] - Argument 8
// [sp + 3] - Argument 7
// [sp + 2] - Argument 6
// [sp + 1] - Argument 5
// [sp + 0] - saved ra
// Argument 9: Pass current isolate address.
// CFunctionArgumentOperand handles MIPS stack argument slots.
__ li(a0, Operand(ExternalReference::isolate_address(isolate)));
__ sw(a0, MemOperand(sp, 5 * kPointerSize));
// Argument 8: Indicate that this is a direct call from JavaScript.
__ li(a0, Operand(1));
__ sw(a0, MemOperand(sp, 4 * kPointerSize));
// Argument 7: Start (high end) of backtracking stack memory area.
__ li(a0, Operand(address_of_regexp_stack_memory_address));
__ lw(a0, MemOperand(a0, 0));
__ li(a2, Operand(address_of_regexp_stack_memory_size));
__ lw(a2, MemOperand(a2, 0));
__ addu(a0, a0, a2);
__ sw(a0, MemOperand(sp, 3 * kPointerSize));
// Argument 6: Set the number of capture registers to zero to force global
// regexps to behave as non-global. This does not affect non-global regexps.
__ mov(a0, zero_reg);
__ sw(a0, MemOperand(sp, 2 * kPointerSize));
// Argument 5: static offsets vector buffer.
__ li(a0, Operand(
ExternalReference::address_of_static_offsets_vector(isolate)));
__ sw(a0, MemOperand(sp, 1 * kPointerSize));
// For arguments 4 and 3 get string length, calculate start of string data
// and calculate the shift of the index (0 for ASCII and 1 for two byte).
__ Addu(t2, subject, Operand(SeqString::kHeaderSize - kHeapObjectTag));
__ Xor(a3, a3, Operand(1)); // 1 for 2-byte str, 0 for 1-byte.
// Load the length from the original subject string from the previous stack
// frame. Therefore we have to use fp, which points exactly to two pointer
// sizes below the previous sp. (Because creating a new stack frame pushes
// the previous fp onto the stack and moves up sp by 2 * kPointerSize.)
__ lw(subject, MemOperand(fp, kSubjectOffset + 2 * kPointerSize));
// If slice offset is not 0, load the length from the original sliced string.
// Argument 4, a3: End of string data
// Argument 3, a2: Start of string data
// Prepare start and end index of the input.
__ sllv(t1, t0, a3);
__ addu(t0, t2, t1);
__ sllv(t1, a1, a3);
__ addu(a2, t0, t1);
__ lw(t2, FieldMemOperand(subject, String::kLengthOffset));
__ sra(t2, t2, kSmiTagSize);
__ sllv(t1, t2, a3);
__ addu(a3, t0, t1);
// Argument 2 (a1): Previous index.
// Already there
// Argument 1 (a0): Subject string.
__ mov(a0, subject);
// Locate the code entry and call it.
__ Addu(t9, t9, Operand(Code::kHeaderSize - kHeapObjectTag));
DirectCEntryStub stub;
stub.GenerateCall(masm, t9);
__ LeaveExitFrame(false, no_reg, true);
// v0: result
// subject: subject string (callee saved)
// regexp_data: RegExp data (callee saved)
// last_match_info_elements: Last match info elements (callee saved)
// Check the result.
Label success;
__ Branch(&success, eq, v0, Operand(1));
// We expect exactly one result since we force the called regexp to behave
// as non-global.
Label failure;
__ Branch(&failure, eq, v0, Operand(NativeRegExpMacroAssembler::FAILURE));
// If not exception it can only be retry. Handle that in the runtime system.
__ Branch(&runtime, ne, v0, Operand(NativeRegExpMacroAssembler::EXCEPTION));
// Result must now be exception. If there is no pending exception already a
// stack overflow (on the backtrack stack) was detected in RegExp code but
// haven't created the exception yet. Handle that in the runtime system.
// TODO(592): Rerunning the RegExp to get the stack overflow exception.
__ li(a1, Operand(isolate->factory()->the_hole_value()));
__ li(a2, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate)));
__ lw(v0, MemOperand(a2, 0));
__ Branch(&runtime, eq, v0, Operand(a1));
__ sw(a1, MemOperand(a2, 0)); // Clear pending exception.
// Check if the exception is a termination. If so, throw as uncatchable.
__ LoadRoot(a0, Heap::kTerminationExceptionRootIndex);
Label termination_exception;
__ Branch(&termination_exception, eq, v0, Operand(a0));
__ Throw(v0);
__ bind(&termination_exception);
__ ThrowUncatchable(v0);
__ bind(&failure);
// For failure and exception return null.
__ li(v0, Operand(isolate->factory()->null_value()));
__ DropAndRet(4);
// Process the result from the native regexp code.
__ bind(&success);
__ lw(a1,
FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
// Calculate number of capture registers (number_of_captures + 1) * 2.
// Multiplying by 2 comes for free since r1 is smi-tagged.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
__ Addu(a1, a1, Operand(2)); // a1 was a smi.
__ lw(a0, MemOperand(sp, kLastMatchInfoOffset));
__ JumpIfSmi(a0, &runtime);
__ GetObjectType(a0, a2, a2);
__ Branch(&runtime, ne, a2, Operand(JS_ARRAY_TYPE));
// Check that the JSArray is in fast case.
__ lw(last_match_info_elements,
FieldMemOperand(a0, JSArray::kElementsOffset));
__ lw(a0, FieldMemOperand(last_match_info_elements, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kFixedArrayMapRootIndex);
__ Branch(&runtime, ne, a0, Operand(at));
// Check that the last match info has space for the capture registers and the
// additional information.
__ lw(a0,
FieldMemOperand(last_match_info_elements, FixedArray::kLengthOffset));
__ Addu(a2, a1, Operand(RegExpImpl::kLastMatchOverhead));
__ sra(at, a0, kSmiTagSize);
__ Branch(&runtime, gt, a2, Operand(at));
// a1: number of capture registers
// subject: subject string
// Store the capture count.
__ sll(a2, a1, kSmiTagSize + kSmiShiftSize); // To smi.
__ sw(a2, FieldMemOperand(last_match_info_elements,
RegExpImpl::kLastCaptureCountOffset));
// Store last subject and last input.
__ sw(subject,
FieldMemOperand(last_match_info_elements,
RegExpImpl::kLastSubjectOffset));
__ mov(a2, subject);
__ RecordWriteField(last_match_info_elements,
RegExpImpl::kLastSubjectOffset,
subject,
t3,
kRAHasNotBeenSaved,
kDontSaveFPRegs);
__ mov(subject, a2);
__ sw(subject,
FieldMemOperand(last_match_info_elements,
RegExpImpl::kLastInputOffset));
__ RecordWriteField(last_match_info_elements,
RegExpImpl::kLastInputOffset,
subject,
t3,
kRAHasNotBeenSaved,
kDontSaveFPRegs);
// Get the static offsets vector filled by the native regexp code.
ExternalReference address_of_static_offsets_vector =
ExternalReference::address_of_static_offsets_vector(isolate);
__ li(a2, Operand(address_of_static_offsets_vector));
// a1: number of capture registers
// a2: offsets vector
Label next_capture, done;
// Capture register counter starts from number of capture registers and
// counts down until wrapping after zero.
__ Addu(a0,
last_match_info_elements,
Operand(RegExpImpl::kFirstCaptureOffset - kHeapObjectTag));
__ bind(&next_capture);
__ Subu(a1, a1, Operand(1));
__ Branch(&done, lt, a1, Operand(zero_reg));
// Read the value from the static offsets vector buffer.
__ lw(a3, MemOperand(a2, 0));
__ addiu(a2, a2, kPointerSize);
// Store the smi value in the last match info.
__ sll(a3, a3, kSmiTagSize); // Convert to Smi.
__ sw(a3, MemOperand(a0, 0));
__ Branch(&next_capture, USE_DELAY_SLOT);
__ addiu(a0, a0, kPointerSize); // In branch delay slot.
__ bind(&done);
// Return last match info.
__ lw(v0, MemOperand(sp, kLastMatchInfoOffset));
__ DropAndRet(4);
// Do the runtime call to execute the regexp.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
// Deferred code for string handling.
// (6) Not a long external string? If yes, go to (8).
__ bind(&not_seq_nor_cons);
// Go to (8).
__ Branch(&not_long_external, gt, a1, Operand(kExternalStringTag));
// (7) External string. Make it, offset-wise, look like a sequential string.
__ bind(&external_string);
__ lw(a0, FieldMemOperand(subject, HeapObject::kMapOffset));
__ lbu(a0, FieldMemOperand(a0, Map::kInstanceTypeOffset));
if (FLAG_debug_code) {
// Assert that we do not have a cons or slice (indirect strings) here.
// Sequential strings have already been ruled out.
__ And(at, a0, Operand(kIsIndirectStringMask));
__ Assert(eq,
kExternalStringExpectedButNotFound,
at,
Operand(zero_reg));
}
__ lw(subject,
FieldMemOperand(subject, ExternalString::kResourceDataOffset));
// Move the pointer so that offset-wise, it looks like a sequential string.
STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize);
__ Subu(subject,
subject,
SeqTwoByteString::kHeaderSize - kHeapObjectTag);
__ jmp(&seq_string); // Go to (5).
// (8) Short external string or not a string? If yes, bail out to runtime.
__ bind(&not_long_external);
STATIC_ASSERT(kNotStringTag != 0 && kShortExternalStringTag !=0);
__ And(at, a1, Operand(kIsNotStringMask | kShortExternalStringMask));
__ Branch(&runtime, ne, at, Operand(zero_reg));
// (9) Sliced string. Replace subject with parent. Go to (4).
// Load offset into t0 and replace subject string with parent.
__ lw(t0, FieldMemOperand(subject, SlicedString::kOffsetOffset));
__ sra(t0, t0, kSmiTagSize);
__ lw(subject, FieldMemOperand(subject, SlicedString::kParentOffset));
__ jmp(&check_underlying); // Go to (4).
#endif // V8_INTERPRETED_REGEXP
}
void RegExpConstructResultStub::Generate(MacroAssembler* masm) {
const int kMaxInlineLength = 100;
Label slowcase;
Label done;
__ lw(a1, MemOperand(sp, kPointerSize * 2));
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize == 1);
__ JumpIfNotSmi(a1, &slowcase);
__ Branch(&slowcase, hi, a1, Operand(Smi::FromInt(kMaxInlineLength)));
// Smi-tagging is equivalent to multiplying by 2.
// Allocate RegExpResult followed by FixedArray with size in ebx.
// JSArray: [Map][empty properties][Elements][Length-smi][index][input]
// Elements: [Map][Length][..elements..]
// Size of JSArray with two in-object properties and the header of a
// FixedArray.
int objects_size =
(JSRegExpResult::kSize + FixedArray::kHeaderSize) / kPointerSize;
__ srl(t1, a1, kSmiTagSize + kSmiShiftSize);
__ Addu(a2, t1, Operand(objects_size));
__ Allocate(
a2, // In: Size, in words.
v0, // Out: Start of allocation (tagged).
a3, // Scratch register.
t0, // Scratch register.
&slowcase,
static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
// v0: Start of allocated area, object-tagged.
// a1: Number of elements in array, as smi.
// t1: Number of elements, untagged.
// Set JSArray map to global.regexp_result_map().
// Set empty properties FixedArray.
// Set elements to point to FixedArray allocated right after the JSArray.
// Interleave operations for better latency.
__ lw(a2, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
__ Addu(a3, v0, Operand(JSRegExpResult::kSize));
__ li(t0, Operand(masm->isolate()->factory()->empty_fixed_array()));
__ lw(a2, FieldMemOperand(a2, GlobalObject::kNativeContextOffset));
__ sw(a3, FieldMemOperand(v0, JSObject::kElementsOffset));
__ lw(a2, ContextOperand(a2, Context::REGEXP_RESULT_MAP_INDEX));
__ sw(t0, FieldMemOperand(v0, JSObject::kPropertiesOffset));
__ sw(a2, FieldMemOperand(v0, HeapObject::kMapOffset));
// Set input, index and length fields from arguments.
__ lw(a1, MemOperand(sp, kPointerSize * 0));
__ lw(a2, MemOperand(sp, kPointerSize * 1));
__ lw(t2, MemOperand(sp, kPointerSize * 2));
__ sw(a1, FieldMemOperand(v0, JSRegExpResult::kInputOffset));
__ sw(a2, FieldMemOperand(v0, JSRegExpResult::kIndexOffset));
__ sw(t2, FieldMemOperand(v0, JSArray::kLengthOffset));
// Fill out the elements FixedArray.
// v0: JSArray, tagged.
// a3: FixedArray, tagged.
// t1: Number of elements in array, untagged.
// Set map.
__ li(a2, Operand(masm->isolate()->factory()->fixed_array_map()));
__ sw(a2, FieldMemOperand(a3, HeapObject::kMapOffset));
// Set FixedArray length.
__ sll(t2, t1, kSmiTagSize);
__ sw(t2, FieldMemOperand(a3, FixedArray::kLengthOffset));
// Fill contents of fixed-array with undefined.
__ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
__ Addu(a3, a3, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
// Fill fixed array elements with undefined.
// v0: JSArray, tagged.
// a2: undefined.
// a3: Start of elements in FixedArray.
// t1: Number of elements to fill.
Label loop;
__ sll(t1, t1, kPointerSizeLog2); // Convert num elements to num bytes.
__ addu(t1, t1, a3); // Point past last element to store.
__ bind(&loop);
__ Branch(&done, ge, a3, Operand(t1)); // Break when a3 past end of elem.
__ sw(a2, MemOperand(a3));
__ Branch(&loop, USE_DELAY_SLOT);
__ addiu(a3, a3, kPointerSize); // In branch delay slot.
__ bind(&done);
__ DropAndRet(3);
__ bind(&slowcase);
__ TailCallRuntime(Runtime::kRegExpConstructResult, 3, 1);
}
static void GenerateRecordCallTarget(MacroAssembler* masm) {
// Cache the called function in a global property cell. Cache states
// are uninitialized, monomorphic (indicated by a JSFunction), and
// megamorphic.
// a0 : number of arguments to the construct function
// a1 : the function to call
// a2 : cache cell for call target
Label initialize, done, miss, megamorphic, not_array_function;
ASSERT_EQ(*TypeFeedbackCells::MegamorphicSentinel(masm->isolate()),
masm->isolate()->heap()->undefined_value());
ASSERT_EQ(*TypeFeedbackCells::UninitializedSentinel(masm->isolate()),
masm->isolate()->heap()->the_hole_value());
// Load the cache state into a3.
__ lw(a3, FieldMemOperand(a2, Cell::kValueOffset));
// A monomorphic cache hit or an already megamorphic state: invoke the
// function without changing the state.
__ Branch(&done, eq, a3, Operand(a1));
// If we came here, we need to see if we are the array function.
// If we didn't have a matching function, and we didn't find the megamorph
// sentinel, then we have in the cell either some other function or an
// AllocationSite. Do a map check on the object in a3.
__ lw(t1, FieldMemOperand(a3, 0));
__ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
__ Branch(&miss, ne, t1, Operand(at));
// Make sure the function is the Array() function
__ LoadArrayFunction(a3);
__ Branch(&megamorphic, ne, a1, Operand(a3));
__ jmp(&done);
__ bind(&miss);
// A monomorphic miss (i.e, here the cache is not uninitialized) goes
// megamorphic.
__ LoadRoot(at, Heap::kTheHoleValueRootIndex);
__ Branch(&initialize, eq, a3, Operand(at));
// MegamorphicSentinel is an immortal immovable object (undefined) so no
// write-barrier is needed.
__ bind(&megamorphic);
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ sw(at, FieldMemOperand(a2, Cell::kValueOffset));
__ jmp(&done);
// An uninitialized cache is patched with the function or sentinel to
// indicate the ElementsKind if function is the Array constructor.
__ bind(&initialize);
// Make sure the function is the Array() function
__ LoadArrayFunction(a3);
__ Branch(&not_array_function, ne, a1, Operand(a3));
// The target function is the Array constructor.
// Create an AllocationSite if we don't already have it, store it in the cell.
{
FrameScope scope(masm, StackFrame::INTERNAL);
const RegList kSavedRegs =
1 << 4 | // a0
1 << 5 | // a1
1 << 6; // a2
// Arguments register must be smi-tagged to call out.
__ SmiTag(a0);
__ MultiPush(kSavedRegs);
CreateAllocationSiteStub create_stub;
__ CallStub(&create_stub);
__ MultiPop(kSavedRegs);
__ SmiUntag(a0);
}
__ Branch(&done);
__ bind(&not_array_function);
__ sw(a1, FieldMemOperand(a2, Cell::kValueOffset));
// No need for a write barrier here - cells are rescanned.
__ bind(&done);
}
void CallFunctionStub::Generate(MacroAssembler* masm) {
// a1 : the function to call
// a2 : cache cell for call target
Label slow, non_function;
// Check that the function is really a JavaScript function.
// a1: pushed function (to be verified)
__ JumpIfSmi(a1, &non_function);
// The receiver might implicitly be the global object. This is
// indicated by passing the hole as the receiver to the call
// function stub.
if (ReceiverMightBeImplicit() || ReceiverIsImplicit()) {
Label try_call, call, patch_current_context;
if (ReceiverMightBeImplicit()) {
// Get the receiver from the stack.
// function, receiver [, arguments]
__ lw(t0, MemOperand(sp, argc_ * kPointerSize));
// Call as function is indicated with the hole.
__ LoadRoot(at, Heap::kTheHoleValueRootIndex);
__ Branch(&try_call, ne, t0, Operand(at));
}
// Patch the receiver on the stack with the global receiver object.
// Goto slow case if we do not have a function.
__ GetObjectType(a1, a3, a3);
__ Branch(&patch_current_context, ne, a3, Operand(JS_FUNCTION_TYPE));
CallStubCompiler::FetchGlobalProxy(masm, a3, a1);
__ sw(a3, MemOperand(sp, argc_ * kPointerSize));
__ Branch(&call);
__ bind(&patch_current_context);
__ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
__ sw(t0, MemOperand(sp, argc_ * kPointerSize));
__ Branch(&slow);
__ bind(&try_call);
// Get the map of the function object.
__ GetObjectType(a1, a3, a3);
__ Branch(&slow, ne, a3, Operand(JS_FUNCTION_TYPE));
__ bind(&call);
} else {
// Get the map of the function object.
__ GetObjectType(a1, a3, a3);
__ Branch(&slow, ne, a3, Operand(JS_FUNCTION_TYPE));
}
if (RecordCallTarget()) {
GenerateRecordCallTarget(masm);
}
// Fast-case: Invoke the function now.
// a1: pushed function
ParameterCount actual(argc_);
if (ReceiverMightBeImplicit()) {
Label call_as_function;
__ LoadRoot(at, Heap::kTheHoleValueRootIndex);
__ Branch(&call_as_function, eq, t0, Operand(at));
__ InvokeFunction(a1,
actual,
JUMP_FUNCTION,
NullCallWrapper(),
CALL_AS_METHOD);
__ bind(&call_as_function);
}
__ InvokeFunction(a1,
actual,
JUMP_FUNCTION,
NullCallWrapper(),
CALL_AS_FUNCTION);
// Slow-case: Non-function called.
__ bind(&slow);
if (RecordCallTarget()) {
// If there is a call target cache, mark it megamorphic in the
// non-function case. MegamorphicSentinel is an immortal immovable
// object (undefined) so no write barrier is needed.
ASSERT_EQ(*TypeFeedbackCells::MegamorphicSentinel(masm->isolate()),
masm->isolate()->heap()->undefined_value());
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ sw(at, FieldMemOperand(a2, Cell::kValueOffset));
}
// Check for function proxy.
__ Branch(&non_function, ne, a3, Operand(JS_FUNCTION_PROXY_TYPE));
__ push(a1); // Put proxy as additional argument.
__ li(a0, Operand(argc_ + 1, RelocInfo::NONE32));
__ li(a2, Operand(0, RelocInfo::NONE32));
__ GetBuiltinEntry(a3, Builtins::CALL_FUNCTION_PROXY);
__ SetCallKind(t1, CALL_AS_FUNCTION);
{
Handle<Code> adaptor =
masm->isolate()->builtins()->ArgumentsAdaptorTrampoline();
__ Jump(adaptor, RelocInfo::CODE_TARGET);
}
// CALL_NON_FUNCTION expects the non-function callee as receiver (instead
// of the original receiver from the call site).
__ bind(&non_function);
__ sw(a1, MemOperand(sp, argc_ * kPointerSize));
__ li(a0, Operand(argc_)); // Set up the number of arguments.
__ mov(a2, zero_reg);
__ GetBuiltinEntry(a3, Builtins::CALL_NON_FUNCTION);
__ SetCallKind(t1, CALL_AS_METHOD);
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
}
void CallConstructStub::Generate(MacroAssembler* masm) {
// a0 : number of arguments
// a1 : the function to call
// a2 : cache cell for call target
Label slow, non_function_call;
// Check that the function is not a smi.
__ JumpIfSmi(a1, &non_function_call);
// Check that the function is a JSFunction.
__ GetObjectType(a1, a3, a3);
__ Branch(&slow, ne, a3, Operand(JS_FUNCTION_TYPE));
if (RecordCallTarget()) {
GenerateRecordCallTarget(masm);
}
// Jump to the function-specific construct stub.
Register jmp_reg = a3;
__ lw(jmp_reg, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(jmp_reg, FieldMemOperand(jmp_reg,
SharedFunctionInfo::kConstructStubOffset));
__ Addu(at, jmp_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(at);
// a0: number of arguments
// a1: called object
// a3: object type
Label do_call;
__ bind(&slow);
__ Branch(&non_function_call, ne, a3, Operand(JS_FUNCTION_PROXY_TYPE));
__ GetBuiltinEntry(a3, Builtins::CALL_FUNCTION_PROXY_AS_CONSTRUCTOR);
__ jmp(&do_call);
__ bind(&non_function_call);
__ GetBuiltinEntry(a3, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
__ bind(&do_call);
// Set expected number of arguments to zero (not changing r0).
__ li(a2, Operand(0, RelocInfo::NONE32));
__ SetCallKind(t1, CALL_AS_METHOD);
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
}
// StringCharCodeAtGenerator.
void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
Label flat_string;
Label ascii_string;
Label got_char_code;
Label sliced_string;
ASSERT(!t0.is(index_));
ASSERT(!t0.is(result_));
ASSERT(!t0.is(object_));
// If the receiver is a smi trigger the non-string case.
__ JumpIfSmi(object_, receiver_not_string_);
// Fetch the instance type of the receiver into result register.
__ lw(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
__ lbu(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
// If the receiver is not a string trigger the non-string case.
__ And(t0, result_, Operand(kIsNotStringMask));
__ Branch(receiver_not_string_, ne, t0, Operand(zero_reg));
// If the index is non-smi trigger the non-smi case.
__ JumpIfNotSmi(index_, &index_not_smi_);
__ bind(&got_smi_index_);
// Check for index out of range.
__ lw(t0, FieldMemOperand(object_, String::kLengthOffset));
__ Branch(index_out_of_range_, ls, t0, Operand(index_));
__ sra(index_, index_, kSmiTagSize);
StringCharLoadGenerator::Generate(masm,
object_,
index_,
result_,
&call_runtime_);
__ sll(result_, result_, kSmiTagSize);
__ bind(&exit_);
}
void StringCharCodeAtGenerator::GenerateSlow(
MacroAssembler* masm,
const RuntimeCallHelper& call_helper) {
__ Abort(kUnexpectedFallthroughToCharCodeAtSlowCase);
// Index is not a smi.
__ bind(&index_not_smi_);
// If index is a heap number, try converting it to an integer.
__ CheckMap(index_,
result_,
Heap::kHeapNumberMapRootIndex,
index_not_number_,
DONT_DO_SMI_CHECK);
call_helper.BeforeCall(masm);
// Consumed by runtime conversion function:
__ Push(object_, index_);
if (index_flags_ == STRING_INDEX_IS_NUMBER) {
__ CallRuntime(Runtime::kNumberToIntegerMapMinusZero, 1);
} else {
ASSERT(index_flags_ == STRING_INDEX_IS_ARRAY_INDEX);
// NumberToSmi discards numbers that are not exact integers.
__ CallRuntime(Runtime::kNumberToSmi, 1);
}
// Save the conversion result before the pop instructions below
// have a chance to overwrite it.
__ Move(index_, v0);
__ pop(object_);
// Reload the instance type.
__ lw(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
__ lbu(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
call_helper.AfterCall(masm);
// If index is still not a smi, it must be out of range.
__ JumpIfNotSmi(index_, index_out_of_range_);
// Otherwise, return to the fast path.
__ Branch(&got_smi_index_);
// Call runtime. We get here when the receiver is a string and the
// index is a number, but the code of getting the actual character
// is too complex (e.g., when the string needs to be flattened).
__ bind(&call_runtime_);
call_helper.BeforeCall(masm);
__ sll(index_, index_, kSmiTagSize);
__ Push(object_, index_);
__ CallRuntime(Runtime::kStringCharCodeAt, 2);
__ Move(result_, v0);
call_helper.AfterCall(masm);
__ jmp(&exit_);
__ Abort(kUnexpectedFallthroughFromCharCodeAtSlowCase);
}
// -------------------------------------------------------------------------
// StringCharFromCodeGenerator
void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
// Fast case of Heap::LookupSingleCharacterStringFromCode.
ASSERT(!t0.is(result_));
ASSERT(!t0.is(code_));
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiShiftSize == 0);
ASSERT(IsPowerOf2(String::kMaxOneByteCharCode + 1));
__ And(t0,
code_,
Operand(kSmiTagMask |
((~String::kMaxOneByteCharCode) << kSmiTagSize)));
__ Branch(&slow_case_, ne, t0, Operand(zero_reg));
__ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
// At this point code register contains smi tagged ASCII char code.
STATIC_ASSERT(kSmiTag == 0);
__ sll(t0, code_, kPointerSizeLog2 - kSmiTagSize);
__ Addu(result_, result_, t0);
__ lw(result_, FieldMemOperand(result_, FixedArray::kHeaderSize));
__ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
__ Branch(&slow_case_, eq, result_, Operand(t0));
__ bind(&exit_);
}
void StringCharFromCodeGenerator::GenerateSlow(
MacroAssembler* masm,
const RuntimeCallHelper& call_helper) {
__ Abort(kUnexpectedFallthroughToCharFromCodeSlowCase);
__ bind(&slow_case_);
call_helper.BeforeCall(masm);
__ push(code_);
__ CallRuntime(Runtime::kCharFromCode, 1);
__ Move(result_, v0);
call_helper.AfterCall(masm);
__ Branch(&exit_);
__ Abort(kUnexpectedFallthroughFromCharFromCodeSlowCase);
}
void StringHelper::GenerateCopyCharacters(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch,
bool ascii) {
Label loop;
Label done;
// This loop just copies one character at a time, as it is only used for
// very short strings.
if (!ascii) {
__ addu(count, count, count);
}
__ Branch(&done, eq, count, Operand(zero_reg));
__ addu(count, dest, count); // Count now points to the last dest byte.
__ bind(&loop);
__ lbu(scratch, MemOperand(src));
__ addiu(src, src, 1);
__ sb(scratch, MemOperand(dest));
__ addiu(dest, dest, 1);
__ Branch(&loop, lt, dest, Operand(count));
__ bind(&done);
}
enum CopyCharactersFlags {
COPY_ASCII = 1,
DEST_ALWAYS_ALIGNED = 2
};
void StringHelper::GenerateCopyCharactersLong(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Register scratch5,
int flags) {
bool ascii = (flags & COPY_ASCII) != 0;
bool dest_always_aligned = (flags & DEST_ALWAYS_ALIGNED) != 0;
if (dest_always_aligned && FLAG_debug_code) {
// Check that destination is actually word aligned if the flag says
// that it is.
__ And(scratch4, dest, Operand(kPointerAlignmentMask));
__ Check(eq,
kDestinationOfCopyNotAligned,
scratch4,
Operand(zero_reg));
}
const int kReadAlignment = 4;
const int kReadAlignmentMask = kReadAlignment - 1;
// Ensure that reading an entire aligned word containing the last character
// of a string will not read outside the allocated area (because we pad up
// to kObjectAlignment).
STATIC_ASSERT(kObjectAlignment >= kReadAlignment);
// Assumes word reads and writes are little endian.
// Nothing to do for zero characters.
Label done;
if (!ascii) {
__ addu(count, count, count);
}
__ Branch(&done, eq, count, Operand(zero_reg));
Label byte_loop;
// Must copy at least eight bytes, otherwise just do it one byte at a time.
__ Subu(scratch1, count, Operand(8));
__ Addu(count, dest, Operand(count));
Register limit = count; // Read until src equals this.
__ Branch(&byte_loop, lt, scratch1, Operand(zero_reg));
if (!dest_always_aligned) {
// Align dest by byte copying. Copies between zero and three bytes.
__ And(scratch4, dest, Operand(kReadAlignmentMask));
Label dest_aligned;
__ Branch(&dest_aligned, eq, scratch4, Operand(zero_reg));
Label aligned_loop;
__ bind(&aligned_loop);
__ lbu(scratch1, MemOperand(src));
__ addiu(src, src, 1);
__ sb(scratch1, MemOperand(dest));
__ addiu(dest, dest, 1);
__ addiu(scratch4, scratch4, 1);
__ Branch(&aligned_loop, le, scratch4, Operand(kReadAlignmentMask));
__ bind(&dest_aligned);
}
Label simple_loop;
__ And(scratch4, src, Operand(kReadAlignmentMask));
__ Branch(&simple_loop, eq, scratch4, Operand(zero_reg));
// Loop for src/dst that are not aligned the same way.
// This loop uses lwl and lwr instructions. These instructions
// depend on the endianness, and the implementation assumes little-endian.
{
Label loop;
__ bind(&loop);
__ lwr(scratch1, MemOperand(src));
__ Addu(src, src, Operand(kReadAlignment));
__ lwl(scratch1, MemOperand(src, -1));
__ sw(scratch1, MemOperand(dest));
__ Addu(dest, dest, Operand(kReadAlignment));
__ Subu(scratch2, limit, dest);
__ Branch(&loop, ge, scratch2, Operand(kReadAlignment));
}
__ Branch(&byte_loop);
// Simple loop.
// Copy words from src to dest, until less than four bytes left.
// Both src and dest are word aligned.
__ bind(&simple_loop);
{
Label loop;
__ bind(&loop);
__ lw(scratch1, MemOperand(src));
__ Addu(src, src, Operand(kReadAlignment));
__ sw(scratch1, MemOperand(dest));
__ Addu(dest, dest, Operand(kReadAlignment));
__ Subu(scratch2, limit, dest);
__ Branch(&loop, ge, scratch2, Operand(kReadAlignment));
}
// Copy bytes from src to dest until dest hits limit.
__ bind(&byte_loop);
// Test if dest has already reached the limit.
__ Branch(&done, ge, dest, Operand(limit));
__ lbu(scratch1, MemOperand(src));
__ addiu(src, src, 1);
__ sb(scratch1, MemOperand(dest));
__ addiu(dest, dest, 1);
__ Branch(&byte_loop);
__ bind(&done);
}
void StringHelper::GenerateTwoCharacterStringTableProbe(MacroAssembler* masm,
Register c1,
Register c2,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Register scratch5,
Label* not_found) {
// Register scratch3 is the general scratch register in this function.
Register scratch = scratch3;
// Make sure that both characters are not digits as such strings has a
// different hash algorithm. Don't try to look for these in the string table.
Label not_array_index;
__ Subu(scratch, c1, Operand(static_cast<int>('0')));
__ Branch(&not_array_index,
Ugreater,
scratch,
Operand(static_cast<int>('9' - '0')));
__ Subu(scratch, c2, Operand(static_cast<int>('0')));
// If check failed combine both characters into single halfword.
// This is required by the contract of the method: code at the
// not_found branch expects this combination in c1 register.
Label tmp;
__ sll(scratch1, c2, kBitsPerByte);
__ Branch(&tmp, Ugreater, scratch, Operand(static_cast<int>('9' - '0')));
__ Or(c1, c1, scratch1);
__ bind(&tmp);
__ Branch(
not_found, Uless_equal, scratch, Operand(static_cast<int>('9' - '0')));
__ bind(&not_array_index);
// Calculate the two character string hash.
Register hash = scratch1;
StringHelper::GenerateHashInit(masm, hash, c1);
StringHelper::GenerateHashAddCharacter(masm, hash, c2);
StringHelper::GenerateHashGetHash(masm, hash);
// Collect the two characters in a register.
Register chars = c1;
__ sll(scratch, c2, kBitsPerByte);
__ Or(chars, chars, scratch);
// chars: two character string, char 1 in byte 0 and char 2 in byte 1.
// hash: hash of two character string.
// Load string table.
// Load address of first element of the string table.
Register string_table = c2;
__ LoadRoot(string_table, Heap::kStringTableRootIndex);
Register undefined = scratch4;
__ LoadRoot(undefined, Heap::kUndefinedValueRootIndex);
// Calculate capacity mask from the string table capacity.
Register mask = scratch2;
__ lw(mask, FieldMemOperand(string_table, StringTable::kCapacityOffset));
__ sra(mask, mask, 1);
__ Addu(mask, mask, -1);
// Calculate untagged address of the first element of the string table.
Register first_string_table_element = string_table;
__ Addu(first_string_table_element, string_table,
Operand(StringTable::kElementsStartOffset - kHeapObjectTag));
// Registers.
// chars: two character string, char 1 in byte 0 and char 2 in byte 1.
// hash: hash of two character string
// mask: capacity mask
// first_string_table_element: address of the first element of
// the string table
// undefined: the undefined object
// scratch: -
// Perform a number of probes in the string table.
const int kProbes = 4;
Label found_in_string_table;
Label next_probe[kProbes];
Register candidate = scratch5; // Scratch register contains candidate.
for (int i = 0; i < kProbes; i++) {
// Calculate entry in string table.
if (i > 0) {
__ Addu(candidate, hash, Operand(StringTable::GetProbeOffset(i)));
} else {
__ mov(candidate, hash);
}
__ And(candidate, candidate, Operand(mask));
// Load the entry from the symble table.
STATIC_ASSERT(StringTable::kEntrySize == 1);
__ sll(scratch, candidate, kPointerSizeLog2);
__ Addu(scratch, scratch, first_string_table_element);
__ lw(candidate, MemOperand(scratch));
// If entry is undefined no string with this hash can be found.
Label is_string;
__ GetObjectType(candidate, scratch, scratch);
__ Branch(&is_string, ne, scratch, Operand(ODDBALL_TYPE));
__ Branch(not_found, eq, undefined, Operand(candidate));
// Must be the hole (deleted entry).
if (FLAG_debug_code) {
__ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
__ Assert(eq, kOddballInStringTableIsNotUndefinedOrTheHole,
scratch, Operand(candidate));
}
__ jmp(&next_probe[i]);
__ bind(&is_string);
// Check that the candidate is a non-external ASCII string. The instance
// type is still in the scratch register from the CompareObjectType
// operation.
__ JumpIfInstanceTypeIsNotSequentialAscii(scratch, scratch, &next_probe[i]);
// If length is not 2 the string is not a candidate.
__ lw(scratch, FieldMemOperand(candidate, String::kLengthOffset));
__ Branch(&next_probe[i], ne, scratch, Operand(Smi::FromInt(2)));
// Check if the two characters match.
// Assumes that word load is little endian.
__ lhu(scratch, FieldMemOperand(candidate, SeqOneByteString::kHeaderSize));
__ Branch(&found_in_string_table, eq, chars, Operand(scratch));
__ bind(&next_probe[i]);
}
// No matching 2 character string found by probing.
__ jmp(not_found);
// Scratch register contains result when we fall through to here.
Register result = candidate;
__ bind(&found_in_string_table);
__ mov(v0, result);
}
void StringHelper::GenerateHashInit(MacroAssembler* masm,
Register hash,
Register character) {
// hash = seed + character + ((seed + character) << 10);
__ LoadRoot(hash, Heap::kHashSeedRootIndex);
// Untag smi seed and add the character.
__ SmiUntag(hash);
__ addu(hash, hash, character);
__ sll(at, hash, 10);
__ addu(hash, hash, at);
// hash ^= hash >> 6;
__ srl(at, hash, 6);
__ xor_(hash, hash, at);
}
void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
Register hash,
Register character) {
// hash += character;
__ addu(hash, hash, character);
// hash += hash << 10;
__ sll(at, hash, 10);
__ addu(hash, hash, at);
// hash ^= hash >> 6;
__ srl(at, hash, 6);
__ xor_(hash, hash, at);
}
void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
Register hash) {
// hash += hash << 3;
__ sll(at, hash, 3);
__ addu(hash, hash, at);
// hash ^= hash >> 11;
__ srl(at, hash, 11);
__ xor_(hash, hash, at);
// hash += hash << 15;
__ sll(at, hash, 15);
__ addu(hash, hash, at);
__ li(at, Operand(String::kHashBitMask));
__ and_(hash, hash, at);
// if (hash == 0) hash = 27;
__ ori(at, zero_reg, StringHasher::kZeroHash);
__ Movz(hash, at, hash);
}
void SubStringStub::Generate(MacroAssembler* masm) {
Label runtime;
// Stack frame on entry.
// ra: return address
// sp[0]: to
// sp[4]: from
// sp[8]: string
// This stub is called from the native-call %_SubString(...), so
// nothing can be assumed about the arguments. It is tested that:
// "string" is a sequential string,
// both "from" and "to" are smis, and
// 0 <= from <= to <= string.length.
// If any of these assumptions fail, we call the runtime system.
const int kToOffset = 0 * kPointerSize;
const int kFromOffset = 1 * kPointerSize;
const int kStringOffset = 2 * kPointerSize;
__ lw(a2, MemOperand(sp, kToOffset));
__ lw(a3, MemOperand(sp, kFromOffset));
STATIC_ASSERT(kFromOffset == kToOffset + 4);
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
// Utilize delay slots. SmiUntag doesn't emit a jump, everything else is
// safe in this case.
__ UntagAndJumpIfNotSmi(a2, a2, &runtime);
__ UntagAndJumpIfNotSmi(a3, a3, &runtime);
// Both a2 and a3 are untagged integers.
__ Branch(&runtime, lt, a3, Operand(zero_reg)); // From < 0.
__ Branch(&runtime, gt, a3, Operand(a2)); // Fail if from > to.
__ Subu(a2, a2, a3);
// Make sure first argument is a string.
__ lw(v0, MemOperand(sp, kStringOffset));
__ JumpIfSmi(v0, &runtime);
__ lw(a1, FieldMemOperand(v0, HeapObject::kMapOffset));
__ lbu(a1, FieldMemOperand(a1, Map::kInstanceTypeOffset));
__ And(t0, a1, Operand(kIsNotStringMask));
__ Branch(&runtime, ne, t0, Operand(zero_reg));
Label single_char;
__ Branch(&single_char, eq, a2, Operand(1));
// Short-cut for the case of trivial substring.
Label return_v0;
// v0: original string
// a2: result string length
__ lw(t0, FieldMemOperand(v0, String::kLengthOffset));
__ sra(t0, t0, 1);
// Return original string.
__ Branch(&return_v0, eq, a2, Operand(t0));
// Longer than original string's length or negative: unsafe arguments.
__ Branch(&runtime, hi, a2, Operand(t0));
// Shorter than original string's length: an actual substring.
// Deal with different string types: update the index if necessary
// and put the underlying string into t1.
// v0: original string
// a1: instance type
// a2: length
// a3: from index (untagged)
Label underlying_unpacked, sliced_string, seq_or_external_string;
// If the string is not indirect, it can only be sequential or external.
STATIC_ASSERT(kIsIndirectStringMask == (kSlicedStringTag & kConsStringTag));
STATIC_ASSERT(kIsIndirectStringMask != 0);
__ And(t0, a1, Operand(kIsIndirectStringMask));
__ Branch(USE_DELAY_SLOT, &seq_or_external_string, eq, t0, Operand(zero_reg));
// t0 is used as a scratch register and can be overwritten in either case.
__ And(t0, a1, Operand(kSlicedNotConsMask));
__ Branch(&sliced_string, ne, t0, Operand(zero_reg));
// Cons string. Check whether it is flat, then fetch first part.
__ lw(t1, FieldMemOperand(v0, ConsString::kSecondOffset));
__ LoadRoot(t0, Heap::kempty_stringRootIndex);
__ Branch(&runtime, ne, t1, Operand(t0));
__ lw(t1, FieldMemOperand(v0, ConsString::kFirstOffset));
// Update instance type.
__ lw(a1, FieldMemOperand(t1, HeapObject::kMapOffset));
__ lbu(a1, FieldMemOperand(a1, Map::kInstanceTypeOffset));
__ jmp(&underlying_unpacked);
__ bind(&sliced_string);
// Sliced string. Fetch parent and correct start index by offset.
__ lw(t1, FieldMemOperand(v0, SlicedString::kParentOffset));
__ lw(t0, FieldMemOperand(v0, SlicedString::kOffsetOffset));
__ sra(t0, t0, 1); // Add offset to index.
__ Addu(a3, a3, t0);
// Update instance type.
__ lw(a1, FieldMemOperand(t1, HeapObject::kMapOffset));
__ lbu(a1, FieldMemOperand(a1, Map::kInstanceTypeOffset));
__ jmp(&underlying_unpacked);
__ bind(&seq_or_external_string);
// Sequential or external string. Just move string to the expected register.
__ mov(t1, v0);
__ bind(&underlying_unpacked);
if (FLAG_string_slices) {
Label copy_routine;
// t1: underlying subject string
// a1: instance type of underlying subject string
// a2: length
// a3: adjusted start index (untagged)
// Short slice. Copy instead of slicing.
__ Branch(&copy_routine, lt, a2, Operand(SlicedString::kMinLength));
// Allocate new sliced string. At this point we do not reload the instance
// type including the string encoding because we simply rely on the info
// provided by the original string. It does not matter if the original
// string's encoding is wrong because we always have to recheck encoding of
// the newly created string's parent anyways due to externalized strings.
Label two_byte_slice, set_slice_header;
STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0);
STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0);
__ And(t0, a1, Operand(kStringEncodingMask));
__ Branch(&two_byte_slice, eq, t0, Operand(zero_reg));
__ AllocateAsciiSlicedString(v0, a2, t2, t3, &runtime);
__ jmp(&set_slice_header);
__ bind(&two_byte_slice);
__ AllocateTwoByteSlicedString(v0, a2, t2, t3, &runtime);
__ bind(&set_slice_header);
__ sll(a3, a3, 1);
__ sw(t1, FieldMemOperand(v0, SlicedString::kParentOffset));
__ sw(a3, FieldMemOperand(v0, SlicedString::kOffsetOffset));
__ jmp(&return_v0);
__ bind(&copy_routine);
}
// t1: underlying subject string
// a1: instance type of underlying subject string
// a2: length
// a3: adjusted start index (untagged)
Label two_byte_sequential, sequential_string, allocate_result;
STATIC_ASSERT(kExternalStringTag != 0);
STATIC_ASSERT(kSeqStringTag == 0);
__ And(t0, a1, Operand(kExternalStringTag));
__ Branch(&sequential_string, eq, t0, Operand(zero_reg));
// Handle external string.
// Rule out short external strings.
STATIC_CHECK(kShortExternalStringTag != 0);
__ And(t0, a1, Operand(kShortExternalStringTag));
__ Branch(&runtime, ne, t0, Operand(zero_reg));
__ lw(t1, FieldMemOperand(t1, ExternalString::kResourceDataOffset));
// t1 already points to the first character of underlying string.
__ jmp(&allocate_result);
__ bind(&sequential_string);
// Locate first character of underlying subject string.
STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize);
__ Addu(t1, t1, Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
__ bind(&allocate_result);
// Sequential acii string. Allocate the result.
STATIC_ASSERT((kOneByteStringTag & kStringEncodingMask) != 0);
__ And(t0, a1, Operand(kStringEncodingMask));
__ Branch(&two_byte_sequential, eq, t0, Operand(zero_reg));
// Allocate and copy the resulting ASCII string.
__ AllocateAsciiString(v0, a2, t0, t2, t3, &runtime);
// Locate first character of substring to copy.
__ Addu(t1, t1, a3);
// Locate first character of result.
__ Addu(a1, v0, Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
// v0: result string
// a1: first character of result string
// a2: result string length
// t1: first character of substring to copy
STATIC_ASSERT((SeqOneByteString::kHeaderSize & kObjectAlignmentMask) == 0);
StringHelper::GenerateCopyCharactersLong(
masm, a1, t1, a2, a3, t0, t2, t3, t4, COPY_ASCII | DEST_ALWAYS_ALIGNED);
__ jmp(&return_v0);
// Allocate and copy the resulting two-byte string.
__ bind(&two_byte_sequential);
__ AllocateTwoByteString(v0, a2, t0, t2, t3, &runtime);
// Locate first character of substring to copy.
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
__ sll(t0, a3, 1);
__ Addu(t1, t1, t0);
// Locate first character of result.
__ Addu(a1, v0, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// v0: result string.
// a1: first character of result.
// a2: result length.
// t1: first character of substring to copy.
STATIC_ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
StringHelper::GenerateCopyCharactersLong(
masm, a1, t1, a2, a3, t0, t2, t3, t4, DEST_ALWAYS_ALIGNED);
__ bind(&return_v0);
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->sub_string_native(), 1, a3, t0);
__ DropAndRet(3);
// Just jump to runtime to create the sub string.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kSubString, 3, 1);
__ bind(&single_char);
// v0: original string
// a1: instance type
// a2: length
// a3: from index (untagged)
__ SmiTag(a3, a3);
StringCharAtGenerator generator(
v0, a3, a2, v0, &runtime, &runtime, &runtime, STRING_INDEX_IS_NUMBER);
generator.GenerateFast(masm);
__ DropAndRet(3);
generator.SkipSlow(masm, &runtime);
}
void StringCompareStub::GenerateFlatAsciiStringEquals(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2,
Register scratch3) {
Register length = scratch1;
// Compare lengths.
Label strings_not_equal, check_zero_length;
__ lw(length, FieldMemOperand(left, String::kLengthOffset));
__ lw(scratch2, FieldMemOperand(right, String::kLengthOffset));
__ Branch(&check_zero_length, eq, length, Operand(scratch2));
__ bind(&strings_not_equal);
ASSERT(is_int16(NOT_EQUAL));
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(Smi::FromInt(NOT_EQUAL)));
// Check if the length is zero.
Label compare_chars;
__ bind(&check_zero_length);
STATIC_ASSERT(kSmiTag == 0);
__ Branch(&compare_chars, ne, length, Operand(zero_reg));
ASSERT(is_int16(EQUAL));
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(Smi::FromInt(EQUAL)));
// Compare characters.
__ bind(&compare_chars);
GenerateAsciiCharsCompareLoop(masm,
left, right, length, scratch2, scratch3, v0,
&strings_not_equal);
// Characters are equal.
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(Smi::FromInt(EQUAL)));
}
void StringCompareStub::GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4) {
Label result_not_equal, compare_lengths;
// Find minimum length and length difference.
__ lw(scratch1, FieldMemOperand(left, String::kLengthOffset));
__ lw(scratch2, FieldMemOperand(right, String::kLengthOffset));
__ Subu(scratch3, scratch1, Operand(scratch2));
Register length_delta = scratch3;
__ slt(scratch4, scratch2, scratch1);
__ Movn(scratch1, scratch2, scratch4);
Register min_length = scratch1;
STATIC_ASSERT(kSmiTag == 0);
__ Branch(&compare_lengths, eq, min_length, Operand(zero_reg));
// Compare loop.
GenerateAsciiCharsCompareLoop(masm,
left, right, min_length, scratch2, scratch4, v0,
&result_not_equal);
// Compare lengths - strings up to min-length are equal.
__ bind(&compare_lengths);
ASSERT(Smi::FromInt(EQUAL) == static_cast<Smi*>(0));
// Use length_delta as result if it's zero.
__ mov(scratch2, length_delta);
__ mov(scratch4, zero_reg);
__ mov(v0, zero_reg);
__ bind(&result_not_equal);
// Conditionally update the result based either on length_delta or
// the last comparion performed in the loop above.
Label ret;
__ Branch(&ret, eq, scratch2, Operand(scratch4));
__ li(v0, Operand(Smi::FromInt(GREATER)));
__ Branch(&ret, gt, scratch2, Operand(scratch4));
__ li(v0, Operand(Smi::FromInt(LESS)));
__ bind(&ret);
__ Ret();
}
void StringCompareStub::GenerateAsciiCharsCompareLoop(
MacroAssembler* masm,
Register left,
Register right,
Register length,
Register scratch1,
Register scratch2,
Register scratch3,
Label* chars_not_equal) {
// Change index to run from -length to -1 by adding length to string
// start. This means that loop ends when index reaches zero, which
// doesn't need an additional compare.
__ SmiUntag(length);
__ Addu(scratch1, length,
Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
__ Addu(left, left, Operand(scratch1));
__ Addu(right, right, Operand(scratch1));
__ Subu(length, zero_reg, length);
Register index = length; // index = -length;
// Compare loop.
Label loop;
__ bind(&loop);
__ Addu(scratch3, left, index);
__ lbu(scratch1, MemOperand(scratch3));
__ Addu(scratch3, right, index);
__ lbu(scratch2, MemOperand(scratch3));
__ Branch(chars_not_equal, ne, scratch1, Operand(scratch2));
__ Addu(index, index, 1);
__ Branch(&loop, ne, index, Operand(zero_reg));
}
void StringCompareStub::Generate(MacroAssembler* masm) {
Label runtime;
Counters* counters = masm->isolate()->counters();
// Stack frame on entry.
// sp[0]: right string
// sp[4]: left string
__ lw(a1, MemOperand(sp, 1 * kPointerSize)); // Left.
__ lw(a0, MemOperand(sp, 0 * kPointerSize)); // Right.
Label not_same;
__ Branch(&not_same, ne, a0, Operand(a1));
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ li(v0, Operand(Smi::FromInt(EQUAL)));
__ IncrementCounter(counters->string_compare_native(), 1, a1, a2);
__ DropAndRet(2);
__ bind(&not_same);
// Check that both objects are sequential ASCII strings.
__ JumpIfNotBothSequentialAsciiStrings(a1, a0, a2, a3, &runtime);
// Compare flat ASCII strings natively. Remove arguments from stack first.
__ IncrementCounter(counters->string_compare_native(), 1, a2, a3);
__ Addu(sp, sp, Operand(2 * kPointerSize));
GenerateCompareFlatAsciiStrings(masm, a1, a0, a2, a3, t0, t1);
__ bind(&runtime);
__ TailCallRuntime(Runtime::kStringCompare, 2, 1);
}
void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a1 : left
// -- a0 : right
// -- ra : return address
// -----------------------------------
Isolate* isolate = masm->isolate();
// Load a2 with the allocation site. We stick an undefined dummy value here
// and replace it with the real allocation site later when we instantiate this
// stub in BinaryOpICWithAllocationSiteStub::GetCodeCopyFromTemplate().
__ li(a2, handle(isolate->heap()->undefined_value()));
// Make sure that we actually patched the allocation site.
if (FLAG_debug_code) {
__ And(at, a2, Operand(kSmiTagMask));
__ Assert(ne, kExpectedAllocationSite, at, Operand(zero_reg));
__ lw(t0, FieldMemOperand(a2, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
__ Assert(eq, kExpectedAllocationSite, t0, Operand(at));
}
// Tail call into the stub that handles binary operations with allocation
// sites.
BinaryOpWithAllocationSiteStub stub(state_);
__ TailCallStub(&stub);
}
void StringAddStub::Generate(MacroAssembler* masm) {
Label call_runtime, call_builtin;
Builtins::JavaScript builtin_id = Builtins::ADD;
Counters* counters = masm->isolate()->counters();
// Stack on entry:
// sp[0]: second argument (right).
// sp[4]: first argument (left).
// Load the two arguments.
__ lw(a0, MemOperand(sp, 1 * kPointerSize)); // First argument.
__ lw(a1, MemOperand(sp, 0 * kPointerSize)); // Second argument.
// Make sure that both arguments are strings if not known in advance.
// Otherwise, at least one of the arguments is definitely a string,
// and we convert the one that is not known to be a string.
if ((flags_ & STRING_ADD_CHECK_BOTH) == STRING_ADD_CHECK_BOTH) {
ASSERT((flags_ & STRING_ADD_CHECK_LEFT) == STRING_ADD_CHECK_LEFT);
ASSERT((flags_ & STRING_ADD_CHECK_RIGHT) == STRING_ADD_CHECK_RIGHT);
__ JumpIfEitherSmi(a0, a1, &call_runtime);
// Load instance types.
__ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
__ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
__ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
__ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
STATIC_ASSERT(kStringTag == 0);
// If either is not a string, go to runtime.
__ Or(t4, t0, Operand(t1));
__ And(t4, t4, Operand(kIsNotStringMask));
__ Branch(&call_runtime, ne, t4, Operand(zero_reg));
} else if ((flags_ & STRING_ADD_CHECK_LEFT) == STRING_ADD_CHECK_LEFT) {
ASSERT((flags_ & STRING_ADD_CHECK_RIGHT) == 0);
GenerateConvertArgument(
masm, 1 * kPointerSize, a0, a2, a3, t0, t1, &call_builtin);
builtin_id = Builtins::STRING_ADD_RIGHT;
} else if ((flags_ & STRING_ADD_CHECK_RIGHT) == STRING_ADD_CHECK_RIGHT) {
ASSERT((flags_ & STRING_ADD_CHECK_LEFT) == 0);
GenerateConvertArgument(
masm, 0 * kPointerSize, a1, a2, a3, t0, t1, &call_builtin);
builtin_id = Builtins::STRING_ADD_LEFT;
}
// Both arguments are strings.
// a0: first string
// a1: second string
// t0: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// t1: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
{
Label strings_not_empty;
// Check if either of the strings are empty. In that case return the other.
// These tests use zero-length check on string-length whch is an Smi.
// Assert that Smi::FromInt(0) is really 0.
STATIC_ASSERT(kSmiTag == 0);
ASSERT(Smi::FromInt(0) == 0);
__ lw(a2, FieldMemOperand(a0, String::kLengthOffset));
__ lw(a3, FieldMemOperand(a1, String::kLengthOffset));
__ mov(v0, a0); // Assume we'll return first string (from a0).
__ Movz(v0, a1, a2); // If first is empty, return second (from a1).
__ slt(t4, zero_reg, a2); // if (a2 > 0) t4 = 1.
__ slt(t5, zero_reg, a3); // if (a3 > 0) t5 = 1.
__ and_(t4, t4, t5); // Branch if both strings were non-empty.
__ Branch(&strings_not_empty, ne, t4, Operand(zero_reg));
__ IncrementCounter(counters->string_add_native(), 1, a2, a3);
__ DropAndRet(2);
__ bind(&strings_not_empty);
}
// Untag both string-lengths.
__ sra(a2, a2, kSmiTagSize);
__ sra(a3, a3, kSmiTagSize);
// Both strings are non-empty.
// a0: first string
// a1: second string
// a2: length of first string
// a3: length of second string
// t0: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// t1: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// Look at the length of the result of adding the two strings.
Label string_add_flat_result, longer_than_two;
// Adding two lengths can't overflow.
STATIC_ASSERT(String::kMaxLength < String::kMaxLength * 2);
__ Addu(t2, a2, Operand(a3));
// Use the string table when adding two one character strings, as it
// helps later optimizations to return a string here.
__ Branch(&longer_than_two, ne, t2, Operand(2));
// Check that both strings are non-external ASCII strings.
if ((flags_ & STRING_ADD_CHECK_BOTH) != STRING_ADD_CHECK_BOTH) {
__ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
__ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
__ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
__ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
}
__ JumpIfBothInstanceTypesAreNotSequentialAscii(t0, t1, t2, t3,
&call_runtime);
// Get the two characters forming the sub string.
__ lbu(a2, FieldMemOperand(a0, SeqOneByteString::kHeaderSize));
__ lbu(a3, FieldMemOperand(a1, SeqOneByteString::kHeaderSize));
// Try to lookup two character string in string table. If it is not found
// just allocate a new one.
Label make_two_character_string;
StringHelper::GenerateTwoCharacterStringTableProbe(
masm, a2, a3, t2, t3, t0, t1, t5, &make_two_character_string);
__ IncrementCounter(counters->string_add_native(), 1, a2, a3);
__ DropAndRet(2);
__ bind(&make_two_character_string);
// Resulting string has length 2 and first chars of two strings
// are combined into single halfword in a2 register.
// So we can fill resulting string without two loops by a single
// halfword store instruction (which assumes that processor is
// in a little endian mode).
__ li(t2, Operand(2));
__ AllocateAsciiString(v0, t2, t0, t1, t5, &call_runtime);
__ sh(a2, FieldMemOperand(v0, SeqOneByteString::kHeaderSize));
__ IncrementCounter(counters->string_add_native(), 1, a2, a3);
__ DropAndRet(2);
__ bind(&longer_than_two);
// Check if resulting string will be flat.
__ Branch(&string_add_flat_result, lt, t2, Operand(ConsString::kMinLength));
// Handle exceptionally long strings in the runtime system.
STATIC_ASSERT((String::kMaxLength & 0x80000000) == 0);
ASSERT(IsPowerOf2(String::kMaxLength + 1));
// kMaxLength + 1 is representable as shifted literal, kMaxLength is not.
__ Branch(&call_runtime, hs, t2, Operand(String::kMaxLength + 1));
// If result is not supposed to be flat, allocate a cons string object.
// If both strings are ASCII the result is an ASCII cons string.
if ((flags_ & STRING_ADD_CHECK_BOTH) != STRING_ADD_CHECK_BOTH) {
__ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
__ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
__ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
__ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
}
Label non_ascii, allocated, ascii_data;
STATIC_ASSERT(kTwoByteStringTag == 0);
// Branch to non_ascii if either string-encoding field is zero (non-ASCII).
__ And(t4, t0, Operand(t1));
__ And(t4, t4, Operand(kStringEncodingMask));
__ Branch(&non_ascii, eq, t4, Operand(zero_reg));
// Allocate an ASCII cons string.
__ bind(&ascii_data);
__ AllocateAsciiConsString(v0, t2, t0, t1, &call_runtime);
__ bind(&allocated);
// Fill the fields of the cons string.
Label skip_write_barrier, after_writing;
ExternalReference high_promotion_mode = ExternalReference::
new_space_high_promotion_mode_active_address(masm->isolate());
__ li(t0, Operand(high_promotion_mode));
__ lw(t0, MemOperand(t0, 0));
__ Branch(&skip_write_barrier, eq, t0, Operand(zero_reg));
__ mov(t3, v0);
__ sw(a0, FieldMemOperand(t3, ConsString::kFirstOffset));
__ RecordWriteField(t3,
ConsString::kFirstOffset,
a0,
t0,
kRAHasNotBeenSaved,
kDontSaveFPRegs);
__ sw(a1, FieldMemOperand(t3, ConsString::kSecondOffset));
__ RecordWriteField(t3,
ConsString::kSecondOffset,
a1,
t0,
kRAHasNotBeenSaved,
kDontSaveFPRegs);
__ jmp(&after_writing);
__ bind(&skip_write_barrier);
__ sw(a0, FieldMemOperand(v0, ConsString::kFirstOffset));
__ sw(a1, FieldMemOperand(v0, ConsString::kSecondOffset));
__ bind(&after_writing);
__ IncrementCounter(counters->string_add_native(), 1, a2, a3);
__ DropAndRet(2);
__ bind(&non_ascii);
// At least one of the strings is two-byte. Check whether it happens
// to contain only one byte characters.
// t0: first instance type.
// t1: second instance type.
// Branch to if _both_ instances have kOneByteDataHintMask set.
__ And(at, t0, Operand(kOneByteDataHintMask));
__ and_(at, at, t1);
__ Branch(&ascii_data, ne, at, Operand(zero_reg));
__ Xor(t0, t0, Operand(t1));
STATIC_ASSERT(kOneByteStringTag != 0 && kOneByteDataHintTag != 0);
__ And(t0, t0, Operand(kOneByteStringTag | kOneByteDataHintTag));
__ Branch(&ascii_data, eq, t0,
Operand(kOneByteStringTag | kOneByteDataHintTag));
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(v0, t2, t0, t1, &call_runtime);
__ Branch(&allocated);
// We cannot encounter sliced strings or cons strings here since:
STATIC_ASSERT(SlicedString::kMinLength >= ConsString::kMinLength);
// Handle creating a flat result from either external or sequential strings.
// Locate the first characters' locations.
// a0: first string
// a1: second string
// a2: length of first string
// a3: length of second string
// t0: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// t1: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
// t2: sum of lengths.
Label first_prepared, second_prepared;
__ bind(&string_add_flat_result);
if ((flags_ & STRING_ADD_CHECK_BOTH) != STRING_ADD_CHECK_BOTH) {
__ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
__ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
__ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
__ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
}
// Check whether both strings have same encoding
__ Xor(t3, t0, Operand(t1));
__ And(t3, t3, Operand(kStringEncodingMask));
__ Branch(&call_runtime, ne, t3, Operand(zero_reg));
STATIC_ASSERT(kSeqStringTag == 0);
__ And(t4, t0, Operand(kStringRepresentationMask));
STATIC_ASSERT(SeqOneByteString::kHeaderSize == SeqTwoByteString::kHeaderSize);
Label skip_first_add;
__ Branch(&skip_first_add, ne, t4, Operand(zero_reg));
__ Branch(USE_DELAY_SLOT, &first_prepared);
__ addiu(t3, a0, SeqOneByteString::kHeaderSize - kHeapObjectTag);
__ bind(&skip_first_add);
// External string: rule out short external string and load string resource.
STATIC_ASSERT(kShortExternalStringTag != 0);
__ And(t4, t0, Operand(kShortExternalStringMask));
__ Branch(&call_runtime, ne, t4, Operand(zero_reg));
__ lw(t3, FieldMemOperand(a0, ExternalString::kResourceDataOffset));
__ bind(&first_prepared);
STATIC_ASSERT(kSeqStringTag == 0);
__ And(t4, t1, Operand(kStringRepresentationMask));
STATIC_ASSERT(SeqOneByteString::kHeaderSize == SeqTwoByteString::kHeaderSize);
Label skip_second_add;
__ Branch(&skip_second_add, ne, t4, Operand(zero_reg));
__ Branch(USE_DELAY_SLOT, &second_prepared);
__ addiu(a1, a1, SeqOneByteString::kHeaderSize - kHeapObjectTag);
__ bind(&skip_second_add);
// External string: rule out short external string and load string resource.
STATIC_ASSERT(kShortExternalStringTag != 0);
__ And(t4, t1, Operand(kShortExternalStringMask));
__ Branch(&call_runtime, ne, t4, Operand(zero_reg));
__ lw(a1, FieldMemOperand(a1, ExternalString::kResourceDataOffset));
__ bind(&second_prepared);
Label non_ascii_string_add_flat_result;
// t3: first character of first string
// a1: first character of second string
// a2: length of first string
// a3: length of second string
// t2: sum of lengths.
// Both strings have the same encoding.
STATIC_ASSERT(kTwoByteStringTag == 0);
__ And(t4, t1, Operand(kStringEncodingMask));
__ Branch(&non_ascii_string_add_flat_result, eq, t4, Operand(zero_reg));
__ AllocateAsciiString(v0, t2, t0, t1, t5, &call_runtime);
__ Addu(t2, v0, Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
// v0: result string.
// t3: first character of first string.
// a1: first character of second string
// a2: length of first string.
// a3: length of second string.
// t2: first character of result.
StringHelper::GenerateCopyCharacters(masm, t2, t3, a2, t0, true);
// t2: next character of result.
StringHelper::GenerateCopyCharacters(masm, t2, a1, a3, t0, true);
__ IncrementCounter(counters->string_add_native(), 1, a2, a3);
__ DropAndRet(2);
__ bind(&non_ascii_string_add_flat_result);
__ AllocateTwoByteString(v0, t2, t0, t1, t5, &call_runtime);
__ Addu(t2, v0, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// v0: result string.
// t3: first character of first string.
// a1: first character of second string.
// a2: length of first string.
// a3: length of second string.
// t2: first character of result.
StringHelper::GenerateCopyCharacters(masm, t2, t3, a2, t0, false);
// t2: next character of result.
StringHelper::GenerateCopyCharacters(masm, t2, a1, a3, t0, false);
__ IncrementCounter(counters->string_add_native(), 1, a2, a3);
__ DropAndRet(2);
// Just jump to runtime to add the two strings.
__ bind(&call_runtime);
__ TailCallRuntime(Runtime::kStringAdd, 2, 1);
if (call_builtin.is_linked()) {
__ bind(&call_builtin);
__ InvokeBuiltin(builtin_id, JUMP_FUNCTION);
}
}
void StringAddStub::GenerateRegisterArgsPush(MacroAssembler* masm) {
__ push(a0);
__ push(a1);
}
void StringAddStub::GenerateRegisterArgsPop(MacroAssembler* masm) {
__ pop(a1);
__ pop(a0);
}
void StringAddStub::GenerateConvertArgument(MacroAssembler* masm,
int stack_offset,
Register arg,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4,
Label* slow) {
// First check if the argument is already a string.
Label not_string, done;
__ JumpIfSmi(arg, &not_string);
__ GetObjectType(arg, scratch1, scratch1);
__ Branch(&done, lt, scratch1, Operand(FIRST_NONSTRING_TYPE));
// Check the number to string cache.
__ bind(&not_string);
// Puts the cached result into scratch1.
__ LookupNumberStringCache(arg, scratch1, scratch2, scratch3, scratch4, slow);
__ mov(arg, scratch1);
__ sw(arg, MemOperand(sp, stack_offset));
__ bind(&done);
}
void ICCompareStub::GenerateSmis(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::SMI);
Label miss;
__ Or(a2, a1, a0);
__ JumpIfNotSmi(a2, &miss);
if (GetCondition() == eq) {
// For equality we do not care about the sign of the result.
__ Ret(USE_DELAY_SLOT);
__ Subu(v0, a0, a1);
} else {
// Untag before subtracting to avoid handling overflow.
__ SmiUntag(a1);
__ SmiUntag(a0);
__ Ret(USE_DELAY_SLOT);
__ Subu(v0, a1, a0);
}
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateNumbers(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::NUMBER);
Label generic_stub;
Label unordered, maybe_undefined1, maybe_undefined2;
Label miss;
if (left_ == CompareIC::SMI) {
__ JumpIfNotSmi(a1, &miss);
}
if (right_ == CompareIC::SMI) {
__ JumpIfNotSmi(a0, &miss);
}
// Inlining the double comparison and falling back to the general compare
// stub if NaN is involved.
// Load left and right operand.
Label done, left, left_smi, right_smi;
__ JumpIfSmi(a0, &right_smi);
__ CheckMap(a0, a2, Heap::kHeapNumberMapRootIndex, &maybe_undefined1,
DONT_DO_SMI_CHECK);
__ Subu(a2, a0, Operand(kHeapObjectTag));
__ ldc1(f2, MemOperand(a2, HeapNumber::kValueOffset));
__ Branch(&left);
__ bind(&right_smi);
__ SmiUntag(a2, a0); // Can't clobber a0 yet.
FPURegister single_scratch = f6;
__ mtc1(a2, single_scratch);
__ cvt_d_w(f2, single_scratch);
__ bind(&left);
__ JumpIfSmi(a1, &left_smi);
__ CheckMap(a1, a2, Heap::kHeapNumberMapRootIndex, &maybe_undefined2,
DONT_DO_SMI_CHECK);
__ Subu(a2, a1, Operand(kHeapObjectTag));
__ ldc1(f0, MemOperand(a2, HeapNumber::kValueOffset));
__ Branch(&done);
__ bind(&left_smi);
__ SmiUntag(a2, a1); // Can't clobber a1 yet.
single_scratch = f8;
__ mtc1(a2, single_scratch);
__ cvt_d_w(f0, single_scratch);
__ bind(&done);
// Return a result of -1, 0, or 1, or use CompareStub for NaNs.
Label fpu_eq, fpu_lt;
// Test if equal, and also handle the unordered/NaN case.
__ BranchF(&fpu_eq, &unordered, eq, f0, f2);
// Test if less (unordered case is already handled).
__ BranchF(&fpu_lt, NULL, lt, f0, f2);
// Otherwise it's greater, so just fall thru, and return.
ASSERT(is_int16(GREATER) && is_int16(EQUAL) && is_int16(LESS));
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(GREATER));
__ bind(&fpu_eq);
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(EQUAL));
__ bind(&fpu_lt);
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(LESS));
__ bind(&unordered);
__ bind(&generic_stub);
ICCompareStub stub(op_, CompareIC::GENERIC, CompareIC::GENERIC,
CompareIC::GENERIC);
__ Jump(stub.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
__ bind(&maybe_undefined1);
if (Token::IsOrderedRelationalCompareOp(op_)) {
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ Branch(&miss, ne, a0, Operand(at));
__ JumpIfSmi(a1, &unordered);
__ GetObjectType(a1, a2, a2);
__ Branch(&maybe_undefined2, ne, a2, Operand(HEAP_NUMBER_TYPE));
__ jmp(&unordered);
}
__ bind(&maybe_undefined2);
if (Token::IsOrderedRelationalCompareOp(op_)) {
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ Branch(&unordered, eq, a1, Operand(at));
}
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateInternalizedStrings(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::INTERNALIZED_STRING);
Label miss;
// Registers containing left and right operands respectively.
Register left = a1;
Register right = a0;
Register tmp1 = a2;
Register tmp2 = a3;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are internalized strings.
__ lw(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ lw(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ lbu(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ lbu(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ Or(tmp1, tmp1, Operand(tmp2));
__ And(at, tmp1, Operand(kIsNotStringMask | kIsNotInternalizedMask));
__ Branch(&miss, ne, at, Operand(zero_reg));
// Make sure a0 is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(a0));
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ mov(v0, right);
// Internalized strings are compared by identity.
__ Ret(ne, left, Operand(right));
ASSERT(is_int16(EQUAL));
__ Ret(USE_DELAY_SLOT);
__ li(v0, Operand(Smi::FromInt(EQUAL)));
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateUniqueNames(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::UNIQUE_NAME);
ASSERT(GetCondition() == eq);
Label miss;
// Registers containing left and right operands respectively.
Register left = a1;
Register right = a0;
Register tmp1 = a2;
Register tmp2 = a3;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are unique names. This leaves the instance
// types loaded in tmp1 and tmp2.
__ lw(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ lw(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ lbu(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ lbu(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
__ JumpIfNotUniqueName(tmp1, &miss);
__ JumpIfNotUniqueName(tmp2, &miss);
// Use a0 as result
__ mov(v0, a0);
// Unique names are compared by identity.
Label done;
__ Branch(&done, ne, left, Operand(right));
// Make sure a0 is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(a0));
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ li(v0, Operand(Smi::FromInt(EQUAL)));
__ bind(&done);
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateStrings(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::STRING);
Label miss;
bool equality = Token::IsEqualityOp(op_);
// Registers containing left and right operands respectively.
Register left = a1;
Register right = a0;
Register tmp1 = a2;
Register tmp2 = a3;
Register tmp3 = t0;
Register tmp4 = t1;
Register tmp5 = t2;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are strings. This leaves the instance
// types loaded in tmp1 and tmp2.
__ lw(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ lw(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ lbu(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ lbu(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kNotStringTag != 0);
__ Or(tmp3, tmp1, tmp2);
__ And(tmp5, tmp3, Operand(kIsNotStringMask));
__ Branch(&miss, ne, tmp5, Operand(zero_reg));
// Fast check for identical strings.
Label left_ne_right;
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ Branch(&left_ne_right, ne, left, Operand(right));
__ Ret(USE_DELAY_SLOT);
__ mov(v0, zero_reg); // In the delay slot.
__ bind(&left_ne_right);
// Handle not identical strings.
// Check that both strings are internalized strings. If they are, we're done
// because we already know they are not identical. We know they are both
// strings.
if (equality) {
ASSERT(GetCondition() == eq);
STATIC_ASSERT(kInternalizedTag == 0);
__ Or(tmp3, tmp1, Operand(tmp2));
__ And(tmp5, tmp3, Operand(kIsNotInternalizedMask));
Label is_symbol;
__ Branch(&is_symbol, ne, tmp5, Operand(zero_reg));
// Make sure a0 is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(a0));
__ Ret(USE_DELAY_SLOT);
__ mov(v0, a0); // In the delay slot.
__ bind(&is_symbol);
}
// Check that both strings are sequential ASCII.
Label runtime;
__ JumpIfBothInstanceTypesAreNotSequentialAscii(
tmp1, tmp2, tmp3, tmp4, &runtime);
// Compare flat ASCII strings. Returns when done.
if (equality) {
StringCompareStub::GenerateFlatAsciiStringEquals(
masm, left, right, tmp1, tmp2, tmp3);
} else {
StringCompareStub::GenerateCompareFlatAsciiStrings(
masm, left, right, tmp1, tmp2, tmp3, tmp4);
}
// Handle more complex cases in runtime.
__ bind(&runtime);
__ Push(left, right);
if (equality) {
__ TailCallRuntime(Runtime::kStringEquals, 2, 1);
} else {
__ TailCallRuntime(Runtime::kStringCompare, 2, 1);
}
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateObjects(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::OBJECT);
Label miss;
__ And(a2, a1, Operand(a0));
__ JumpIfSmi(a2, &miss);
__ GetObjectType(a0, a2, a2);
__ Branch(&miss, ne, a2, Operand(JS_OBJECT_TYPE));
__ GetObjectType(a1, a2, a2);
__ Branch(&miss, ne, a2, Operand(JS_OBJECT_TYPE));
ASSERT(GetCondition() == eq);
__ Ret(USE_DELAY_SLOT);
__ subu(v0, a0, a1);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateKnownObjects(MacroAssembler* masm) {
Label miss;
__ And(a2, a1, a0);
__ JumpIfSmi(a2, &miss);
__ lw(a2, FieldMemOperand(a0, HeapObject::kMapOffset));
__ lw(a3, FieldMemOperand(a1, HeapObject::kMapOffset));
__ Branch(&miss, ne, a2, Operand(known_map_));
__ Branch(&miss, ne, a3, Operand(known_map_));
__ Ret(USE_DELAY_SLOT);
__ subu(v0, a0, a1);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateMiss(MacroAssembler* masm) {
{
// Call the runtime system in a fresh internal frame.
ExternalReference miss =
ExternalReference(IC_Utility(IC::kCompareIC_Miss), masm->isolate());
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(a1, a0);
__ Push(ra, a1, a0);
__ li(t0, Operand(Smi::FromInt(op_)));
__ addiu(sp, sp, -kPointerSize);
__ CallExternalReference(miss, 3, USE_DELAY_SLOT);
__ sw(t0, MemOperand(sp)); // In the delay slot.
// Compute the entry point of the rewritten stub.
__ Addu(a2, v0, Operand(Code::kHeaderSize - kHeapObjectTag));
// Restore registers.
__ Pop(a1, a0, ra);
}
__ Jump(a2);
}
void DirectCEntryStub::Generate(MacroAssembler* masm) {
// Make place for arguments to fit C calling convention. Most of the callers
// of DirectCEntryStub::GenerateCall are using EnterExitFrame/LeaveExitFrame
// so they handle stack restoring and we don't have to do that here.
// Any caller of DirectCEntryStub::GenerateCall must take care of dropping
// kCArgsSlotsSize stack space after the call.
__ Subu(sp, sp, Operand(kCArgsSlotsSize));
// Place the return address on the stack, making the call
// GC safe. The RegExp backend also relies on this.
__ sw(ra, MemOperand(sp, kCArgsSlotsSize));
__ Call(t9); // Call the C++ function.
__ lw(t9, MemOperand(sp, kCArgsSlotsSize));
if (FLAG_debug_code && FLAG_enable_slow_asserts) {
// In case of an error the return address may point to a memory area
// filled with kZapValue by the GC.
// Dereference the address and check for this.
__ lw(t0, MemOperand(t9));
__ Assert(ne, kReceivedInvalidReturnAddress, t0,
Operand(reinterpret_cast<uint32_t>(kZapValue)));
}
__ Jump(t9);
}
void DirectCEntryStub::GenerateCall(MacroAssembler* masm,
Register target) {
intptr_t loc =
reinterpret_cast<intptr_t>(GetCode(masm->isolate()).location());
__ Move(t9, target);
__ li(ra, Operand(loc, RelocInfo::CODE_TARGET), CONSTANT_SIZE);
__ Call(ra);
}
void NameDictionaryLookupStub::GenerateNegativeLookup(MacroAssembler* masm,
Label* miss,
Label* done,
Register receiver,
Register properties,
Handle<Name> name,
Register scratch0) {
ASSERT(name->IsUniqueName());
// If names of slots in range from 1 to kProbes - 1 for the hash value are
// not equal to the name and kProbes-th slot is not used (its name is the
// undefined value), it guarantees the hash table doesn't contain the
// property. It's true even if some slots represent deleted properties
// (their names are the hole value).
for (int i = 0; i < kInlinedProbes; i++) {
// scratch0 points to properties hash.
// Compute the masked index: (hash + i + i * i) & mask.
Register index = scratch0;
// Capacity is smi 2^n.
__ lw(index, FieldMemOperand(properties, kCapacityOffset));
__ Subu(index, index, Operand(1));
__ And(index, index, Operand(
Smi::FromInt(name->Hash() + NameDictionary::GetProbeOffset(i))));
// Scale the index by multiplying by the entry size.
ASSERT(NameDictionary::kEntrySize == 3);
__ sll(at, index, 1);
__ Addu(index, index, at);
Register entity_name = scratch0;
// Having undefined at this place means the name is not contained.
ASSERT_EQ(kSmiTagSize, 1);
Register tmp = properties;
__ sll(scratch0, index, 1);
__ Addu(tmp, properties, scratch0);
__ lw(entity_name, FieldMemOperand(tmp, kElementsStartOffset));
ASSERT(!tmp.is(entity_name));
__ LoadRoot(tmp, Heap::kUndefinedValueRootIndex);
__ Branch(done, eq, entity_name, Operand(tmp));
// Load the hole ready for use below:
__ LoadRoot(tmp, Heap::kTheHoleValueRootIndex);
// Stop if found the property.
__ Branch(miss, eq, entity_name, Operand(Handle<Name>(name)));
Label good;
__ Branch(&good, eq, entity_name, Operand(tmp));
// Check if the entry name is not a unique name.
__ lw(entity_name, FieldMemOperand(entity_name, HeapObject::kMapOffset));
__ lbu(entity_name,
FieldMemOperand(entity_name, Map::kInstanceTypeOffset));
__ JumpIfNotUniqueName(entity_name, miss);
__ bind(&good);
// Restore the properties.
__ lw(properties,
FieldMemOperand(receiver, JSObject::kPropertiesOffset));
}
const int spill_mask =
(ra.bit() | t2.bit() | t1.bit() | t0.bit() | a3.bit() |
a2.bit() | a1.bit() | a0.bit() | v0.bit());
__ MultiPush(spill_mask);
__ lw(a0, FieldMemOperand(receiver, JSObject::kPropertiesOffset));
__ li(a1, Operand(Handle<Name>(name)));
NameDictionaryLookupStub stub(NEGATIVE_LOOKUP);
__ CallStub(&stub);
__ mov(at, v0);
__ MultiPop(spill_mask);
__ Branch(done, eq, at, Operand(zero_reg));
__ Branch(miss, ne, at, Operand(zero_reg));
}
// Probe the name dictionary in the |elements| register. Jump to the
// |done| label if a property with the given name is found. Jump to
// the |miss| label otherwise.
// If lookup was successful |scratch2| will be equal to elements + 4 * index.
void NameDictionaryLookupStub::GeneratePositiveLookup(MacroAssembler* masm,
Label* miss,
Label* done,
Register elements,
Register name,
Register scratch1,
Register scratch2) {
ASSERT(!elements.is(scratch1));
ASSERT(!elements.is(scratch2));
ASSERT(!name.is(scratch1));
ASSERT(!name.is(scratch2));
__ AssertName(name);
// Compute the capacity mask.
__ lw(scratch1, FieldMemOperand(elements, kCapacityOffset));
__ sra(scratch1, scratch1, kSmiTagSize); // convert smi to int
__ Subu(scratch1, scratch1, Operand(1));
// Generate an unrolled loop that performs a few probes before
// giving up. Measurements done on Gmail indicate that 2 probes
// cover ~93% of loads from dictionaries.
for (int i = 0; i < kInlinedProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
__ lw(scratch2, FieldMemOperand(name, Name::kHashFieldOffset));
if (i > 0) {
// Add the probe offset (i + i * i) left shifted to avoid right shifting
// the hash in a separate instruction. The value hash + i + i * i is right
// shifted in the following and instruction.
ASSERT(NameDictionary::GetProbeOffset(i) <
1 << (32 - Name::kHashFieldOffset));
__ Addu(scratch2, scratch2, Operand(
NameDictionary::GetProbeOffset(i) << Name::kHashShift));
}
__ srl(scratch2, scratch2, Name::kHashShift);
__ And(scratch2, scratch1, scratch2);
// Scale the index by multiplying by the element size.
ASSERT(NameDictionary::kEntrySize == 3);
// scratch2 = scratch2 * 3.
__ sll(at, scratch2, 1);
__ Addu(scratch2, scratch2, at);
// Check if the key is identical to the name.
__ sll(at, scratch2, 2);
__ Addu(scratch2, elements, at);
__ lw(at, FieldMemOperand(scratch2, kElementsStartOffset));
__ Branch(done, eq, name, Operand(at));
}
const int spill_mask =
(ra.bit() | t2.bit() | t1.bit() | t0.bit() |
a3.bit() | a2.bit() | a1.bit() | a0.bit() | v0.bit()) &
~(scratch1.bit() | scratch2.bit());
__ MultiPush(spill_mask);
if (name.is(a0)) {
ASSERT(!elements.is(a1));
__ Move(a1, name);
__ Move(a0, elements);
} else {
__ Move(a0, elements);
__ Move(a1, name);
}
NameDictionaryLookupStub stub(POSITIVE_LOOKUP);
__ CallStub(&stub);
__ mov(scratch2, a2);
__ mov(at, v0);
__ MultiPop(spill_mask);
__ Branch(done, ne, at, Operand(zero_reg));
__ Branch(miss, eq, at, Operand(zero_reg));
}
void NameDictionaryLookupStub::Generate(MacroAssembler* masm) {
// This stub overrides SometimesSetsUpAFrame() to return false. That means
// we cannot call anything that could cause a GC from this stub.
// Registers:
// result: NameDictionary to probe
// a1: key
// dictionary: NameDictionary to probe.
// index: will hold an index of entry if lookup is successful.
// might alias with result_.
// Returns:
// result_ is zero if lookup failed, non zero otherwise.
Register result = v0;
Register dictionary = a0;
Register key = a1;
Register index = a2;
Register mask = a3;
Register hash = t0;
Register undefined = t1;
Register entry_key = t2;
Label in_dictionary, maybe_in_dictionary, not_in_dictionary;
__ lw(mask, FieldMemOperand(dictionary, kCapacityOffset));
__ sra(mask, mask, kSmiTagSize);
__ Subu(mask, mask, Operand(1));
__ lw(hash, FieldMemOperand(key, Name::kHashFieldOffset));
__ LoadRoot(undefined, Heap::kUndefinedValueRootIndex);
for (int i = kInlinedProbes; i < kTotalProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
// Capacity is smi 2^n.
if (i > 0) {
// Add the probe offset (i + i * i) left shifted to avoid right shifting
// the hash in a separate instruction. The value hash + i + i * i is right
// shifted in the following and instruction.
ASSERT(NameDictionary::GetProbeOffset(i) <
1 << (32 - Name::kHashFieldOffset));
__ Addu(index, hash, Operand(
NameDictionary::GetProbeOffset(i) << Name::kHashShift));
} else {
__ mov(index, hash);
}
__ srl(index, index, Name::kHashShift);
__ And(index, mask, index);
// Scale the index by multiplying by the entry size.
ASSERT(NameDictionary::kEntrySize == 3);
// index *= 3.
__ mov(at, index);
__ sll(index, index, 1);
__ Addu(index, index, at);
ASSERT_EQ(kSmiTagSize, 1);
__ sll(index, index, 2);
__ Addu(index, index, dictionary);
__ lw(entry_key, FieldMemOperand(index, kElementsStartOffset));
// Having undefined at this place means the name is not contained.
__ Branch(&not_in_dictionary, eq, entry_key, Operand(undefined));
// Stop if found the property.
__ Branch(&in_dictionary, eq, entry_key, Operand(key));
if (i != kTotalProbes - 1 && mode_ == NEGATIVE_LOOKUP) {
// Check if the entry name is not a unique name.
__ lw(entry_key, FieldMemOperand(entry_key, HeapObject::kMapOffset));
__ lbu(entry_key,
FieldMemOperand(entry_key, Map::kInstanceTypeOffset));
__ JumpIfNotUniqueName(entry_key, &maybe_in_dictionary);
}
}
__ bind(&maybe_in_dictionary);
// If we are doing negative lookup then probing failure should be
// treated as a lookup success. For positive lookup probing failure
// should be treated as lookup failure.
if (mode_ == POSITIVE_LOOKUP) {
__ Ret(USE_DELAY_SLOT);
__ mov(result, zero_reg);
}
__ bind(&in_dictionary);
__ Ret(USE_DELAY_SLOT);
__ li(result, 1);
__ bind(&not_in_dictionary);
__ Ret(USE_DELAY_SLOT);
__ mov(result, zero_reg);
}
void StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(
Isolate* isolate) {
StoreBufferOverflowStub stub1(kDontSaveFPRegs);
stub1.GetCode(isolate);
// Hydrogen code stubs need stub2 at snapshot time.
StoreBufferOverflowStub stub2(kSaveFPRegs);
stub2.GetCode(isolate);
}
bool CodeStub::CanUseFPRegisters() {
return true; // FPU is a base requirement for V8.
}
// Takes the input in 3 registers: address_ value_ and object_. A pointer to
// the value has just been written into the object, now this stub makes sure
// we keep the GC informed. The word in the object where the value has been
// written is in the address register.
void RecordWriteStub::Generate(MacroAssembler* masm) {
Label skip_to_incremental_noncompacting;
Label skip_to_incremental_compacting;
// The first two branch+nop instructions are generated with labels so as to
// get the offset fixed up correctly by the bind(Label*) call. We patch it
// back and forth between a "bne zero_reg, zero_reg, ..." (a nop in this
// position) and the "beq zero_reg, zero_reg, ..." when we start and stop
// incremental heap marking.
// See RecordWriteStub::Patch for details.
__ beq(zero_reg, zero_reg, &skip_to_incremental_noncompacting);
__ nop();
__ beq(zero_reg, zero_reg, &skip_to_incremental_compacting);
__ nop();
if (remembered_set_action_ == EMIT_REMEMBERED_SET) {
__ RememberedSetHelper(object_,
address_,
value_,
save_fp_regs_mode_,
MacroAssembler::kReturnAtEnd);
}
__ Ret();
__ bind(&skip_to_incremental_noncompacting);
GenerateIncremental(masm, INCREMENTAL);
__ bind(&skip_to_incremental_compacting);
GenerateIncremental(masm, INCREMENTAL_COMPACTION);
// Initial mode of the stub is expected to be STORE_BUFFER_ONLY.
// Will be checked in IncrementalMarking::ActivateGeneratedStub.
PatchBranchIntoNop(masm, 0);
PatchBranchIntoNop(masm, 2 * Assembler::kInstrSize);
}
void RecordWriteStub::GenerateIncremental(MacroAssembler* masm, Mode mode) {
regs_.Save(masm);
if (remembered_set_action_ == EMIT_REMEMBERED_SET) {
Label dont_need_remembered_set;
__ lw(regs_.scratch0(), MemOperand(regs_.address(), 0));
__ JumpIfNotInNewSpace(regs_.scratch0(), // Value.
regs_.scratch0(),
&dont_need_remembered_set);
__ CheckPageFlag(regs_.object(),
regs_.scratch0(),
1 << MemoryChunk::SCAN_ON_SCAVENGE,
ne,
&dont_need_remembered_set);
// First notify the incremental marker if necessary, then update the
// remembered set.
CheckNeedsToInformIncrementalMarker(
masm, kUpdateRememberedSetOnNoNeedToInformIncrementalMarker, mode);
InformIncrementalMarker(masm, mode);
regs_.Restore(masm);
__ RememberedSetHelper(object_,
address_,
value_,
save_fp_regs_mode_,
MacroAssembler::kReturnAtEnd);
__ bind(&dont_need_remembered_set);
}
CheckNeedsToInformIncrementalMarker(
masm, kReturnOnNoNeedToInformIncrementalMarker, mode);
InformIncrementalMarker(masm, mode);
regs_.Restore(masm);
__ Ret();
}
void RecordWriteStub::InformIncrementalMarker(MacroAssembler* masm, Mode mode) {
regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode_);
int argument_count = 3;
__ PrepareCallCFunction(argument_count, regs_.scratch0());
Register address =
a0.is(regs_.address()) ? regs_.scratch0() : regs_.address();
ASSERT(!address.is(regs_.object()));
ASSERT(!address.is(a0));
__ Move(address, regs_.address());
__ Move(a0, regs_.object());
__ Move(a1, address);
__ li(a2, Operand(ExternalReference::isolate_address(masm->isolate())));
AllowExternalCallThatCantCauseGC scope(masm);
if (mode == INCREMENTAL_COMPACTION) {
__ CallCFunction(
ExternalReference::incremental_evacuation_record_write_function(
masm->isolate()),
argument_count);
} else {
ASSERT(mode == INCREMENTAL);
__ CallCFunction(
ExternalReference::incremental_marking_record_write_function(
masm->isolate()),
argument_count);
}
regs_.RestoreCallerSaveRegisters(masm, save_fp_regs_mode_);
}
void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
MacroAssembler* masm,
OnNoNeedToInformIncrementalMarker on_no_need,
Mode mode) {
Label on_black;
Label need_incremental;
Label need_incremental_pop_scratch;
__ And(regs_.scratch0(), regs_.object(), Operand(~Page::kPageAlignmentMask));
__ lw(regs_.scratch1(),
MemOperand(regs_.scratch0(),
MemoryChunk::kWriteBarrierCounterOffset));
__ Subu(regs_.scratch1(), regs_.scratch1(), Operand(1));
__ sw(regs_.scratch1(),
MemOperand(regs_.scratch0(),
MemoryChunk::kWriteBarrierCounterOffset));
__ Branch(&need_incremental, lt, regs_.scratch1(), Operand(zero_reg));
// Let's look at the color of the object: If it is not black we don't have
// to inform the incremental marker.
__ JumpIfBlack(regs_.object(), regs_.scratch0(), regs_.scratch1(), &on_black);
regs_.Restore(masm);
if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
__ RememberedSetHelper(object_,
address_,
value_,
save_fp_regs_mode_,
MacroAssembler::kReturnAtEnd);
} else {
__ Ret();
}
__ bind(&on_black);
// Get the value from the slot.
__ lw(regs_.scratch0(), MemOperand(regs_.address(), 0));
if (mode == INCREMENTAL_COMPACTION) {
Label ensure_not_white;
__ CheckPageFlag(regs_.scratch0(), // Contains value.
regs_.scratch1(), // Scratch.
MemoryChunk::kEvacuationCandidateMask,
eq,
&ensure_not_white);
__ CheckPageFlag(regs_.object(),
regs_.scratch1(), // Scratch.
MemoryChunk::kSkipEvacuationSlotsRecordingMask,
eq,
&need_incremental);
__ bind(&ensure_not_white);
}
// We need extra registers for this, so we push the object and the address
// register temporarily.
__ Push(regs_.object(), regs_.address());
__ EnsureNotWhite(regs_.scratch0(), // The value.
regs_.scratch1(), // Scratch.
regs_.object(), // Scratch.
regs_.address(), // Scratch.
&need_incremental_pop_scratch);
__ Pop(regs_.object(), regs_.address());
regs_.Restore(masm);
if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
__ RememberedSetHelper(object_,
address_,
value_,
save_fp_regs_mode_,
MacroAssembler::kReturnAtEnd);
} else {
__ Ret();
}
__ bind(&need_incremental_pop_scratch);
__ Pop(regs_.object(), regs_.address());
__ bind(&need_incremental);
// Fall through when we need to inform the incremental marker.
}
void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : element value to store
// -- a3 : element index as smi
// -- sp[0] : array literal index in function as smi
// -- sp[4] : array literal
// clobbers a1, a2, t0
// -----------------------------------
Label element_done;
Label double_elements;
Label smi_element;
Label slow_elements;
Label fast_elements;
// Get array literal index, array literal and its map.
__ lw(t0, MemOperand(sp, 0 * kPointerSize));
__ lw(a1, MemOperand(sp, 1 * kPointerSize));
__ lw(a2, FieldMemOperand(a1, JSObject::kMapOffset));
__ CheckFastElements(a2, t1, &double_elements);
// Check for FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS elements
__ JumpIfSmi(a0, &smi_element);
__ CheckFastSmiElements(a2, t1, &fast_elements);
// Store into the array literal requires a elements transition. Call into
// the runtime.
__ bind(&slow_elements);
// call.
__ Push(a1, a3, a0);
__ lw(t1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ lw(t1, FieldMemOperand(t1, JSFunction::kLiteralsOffset));
__ Push(t1, t0);
__ TailCallRuntime(Runtime::kStoreArrayLiteralElement, 5, 1);
// Array literal has ElementsKind of FAST_*_ELEMENTS and value is an object.
__ bind(&fast_elements);
__ lw(t1, FieldMemOperand(a1, JSObject::kElementsOffset));
__ sll(t2, a3, kPointerSizeLog2 - kSmiTagSize);
__ Addu(t2, t1, t2);
__ Addu(t2, t2, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ sw(a0, MemOperand(t2, 0));
// Update the write barrier for the array store.
__ RecordWrite(t1, t2, a0, kRAHasNotBeenSaved, kDontSaveFPRegs,
EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
__ Ret(USE_DELAY_SLOT);
__ mov(v0, a0);
// Array literal has ElementsKind of FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS,
// and value is Smi.
__ bind(&smi_element);
__ lw(t1, FieldMemOperand(a1, JSObject::kElementsOffset));
__ sll(t2, a3, kPointerSizeLog2 - kSmiTagSize);
__ Addu(t2, t1, t2);
__ sw(a0, FieldMemOperand(t2, FixedArray::kHeaderSize));
__ Ret(USE_DELAY_SLOT);
__ mov(v0, a0);
// Array literal has ElementsKind of FAST_*_DOUBLE_ELEMENTS.
__ bind(&double_elements);
__ lw(t1, FieldMemOperand(a1, JSObject::kElementsOffset));
__ StoreNumberToDoubleElements(a0, a3, t1, t3, t5, a2, &slow_elements);
__ Ret(USE_DELAY_SLOT);
__ mov(v0, a0);
}
void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
CEntryStub ces(1, fp_registers_ ? kSaveFPRegs : kDontSaveFPRegs);
__ Call(ces.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
int parameter_count_offset =
StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;
__ lw(a1, MemOperand(fp, parameter_count_offset));
if (function_mode_ == JS_FUNCTION_STUB_MODE) {
__ Addu(a1, a1, Operand(1));
}
masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
__ sll(a1, a1, kPointerSizeLog2);
__ Ret(USE_DELAY_SLOT);
__ Addu(sp, sp, a1);
}
void StubFailureTailCallTrampolineStub::Generate(MacroAssembler* masm) {
CEntryStub ces(1, fp_registers_ ? kSaveFPRegs : kDontSaveFPRegs);
__ Call(ces.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
__ mov(a1, v0);
int parameter_count_offset =
StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;
__ lw(a0, MemOperand(fp, parameter_count_offset));
// The parameter count above includes the receiver for the arguments passed to
// the deoptimization handler. Subtract the receiver for the parameter count
// for the call.
__ Subu(a0, a0, 1);
masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
ParameterCount argument_count(a0);
__ InvokeFunction(
a1, argument_count, JUMP_FUNCTION, NullCallWrapper(), CALL_AS_METHOD);
}
void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
if (masm->isolate()->function_entry_hook() != NULL) {
ProfileEntryHookStub stub;
__ push(ra);
__ CallStub(&stub);
__ pop(ra);
}
}
void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
// The entry hook is a "push ra" instruction, followed by a call.
// Note: on MIPS "push" is 2 instruction
const int32_t kReturnAddressDistanceFromFunctionStart =
Assembler::kCallTargetAddressOffset + (2 * Assembler::kInstrSize);
// This should contain all kJSCallerSaved registers.
const RegList kSavedRegs =
kJSCallerSaved | // Caller saved registers.
s5.bit(); // Saved stack pointer.
// We also save ra, so the count here is one higher than the mask indicates.
const int32_t kNumSavedRegs = kNumJSCallerSaved + 2;
// Save all caller-save registers as this may be called from anywhere.
__ MultiPush(kSavedRegs | ra.bit());
// Compute the function's address for the first argument.
__ Subu(a0, ra, Operand(kReturnAddressDistanceFromFunctionStart));
// The caller's return address is above the saved temporaries.
// Grab that for the second argument to the hook.
__ Addu(a1, sp, Operand(kNumSavedRegs * kPointerSize));
// Align the stack if necessary.
int frame_alignment = masm->ActivationFrameAlignment();
if (frame_alignment > kPointerSize) {
__ mov(s5, sp);
ASSERT(IsPowerOf2(frame_alignment));
__ And(sp, sp, Operand(-frame_alignment));
}
#if defined(V8_HOST_ARCH_MIPS)
int32_t entry_hook =
reinterpret_cast<int32_t>(masm->isolate()->function_entry_hook());
__ li(at, Operand(entry_hook));
#else
// Under the simulator we need to indirect the entry hook through a
// trampoline function at a known address.
// It additionally takes an isolate as a third parameter.
__ li(a2, Operand(ExternalReference::isolate_address(masm->isolate())));
ApiFunction dispatcher(FUNCTION_ADDR(EntryHookTrampoline));
__ li(at, Operand(ExternalReference(&dispatcher,
ExternalReference::BUILTIN_CALL,
masm->isolate())));
#endif
__ Call(at);
// Restore the stack pointer if needed.
if (frame_alignment > kPointerSize) {
__ mov(sp, s5);
}
// Also pop ra to get Ret(0).
__ MultiPop(kSavedRegs | ra.bit());
__ Ret();
}
template<class T>
static void CreateArrayDispatch(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
if (mode == DISABLE_ALLOCATION_SITES) {
T stub(GetInitialFastElementsKind(), mode);
__ TailCallStub(&stub);
} else if (mode == DONT_OVERRIDE) {
int last_index = GetSequenceIndexFromFastElementsKind(
TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= last_index; ++i) {
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
T stub(kind);
__ TailCallStub(&stub, eq, a3, Operand(kind));
}
// If we reached this point there is a problem.
__ Abort(kUnexpectedElementsKindInArrayConstructor);
} else {
UNREACHABLE();
}
}
static void CreateArrayDispatchOneArgument(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
// a2 - type info cell (if mode != DISABLE_ALLOCATION_SITES)
// a3 - kind (if mode != DISABLE_ALLOCATION_SITES)
// a0 - number of arguments
// a1 - constructor?
// sp[0] - last argument
Label normal_sequence;
if (mode == DONT_OVERRIDE) {
ASSERT(FAST_SMI_ELEMENTS == 0);
ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
ASSERT(FAST_ELEMENTS == 2);
ASSERT(FAST_HOLEY_ELEMENTS == 3);
ASSERT(FAST_DOUBLE_ELEMENTS == 4);
ASSERT(FAST_HOLEY_DOUBLE_ELEMENTS == 5);
// is the low bit set? If so, we are holey and that is good.
__ And(at, a3, Operand(1));
__ Branch(&normal_sequence, ne, at, Operand(zero_reg));
}
// look at the first argument
__ lw(t1, MemOperand(sp, 0));
__ Branch(&normal_sequence, eq, t1, Operand(zero_reg));
if (mode == DISABLE_ALLOCATION_SITES) {
ElementsKind initial = GetInitialFastElementsKind();
ElementsKind holey_initial = GetHoleyElementsKind(initial);
ArraySingleArgumentConstructorStub stub_holey(holey_initial,
DISABLE_ALLOCATION_SITES);
__ TailCallStub(&stub_holey);
__ bind(&normal_sequence);
ArraySingleArgumentConstructorStub stub(initial,
DISABLE_ALLOCATION_SITES);
__ TailCallStub(&stub);
} else if (mode == DONT_OVERRIDE) {
// We are going to create a holey array, but our kind is non-holey.
// Fix kind and retry (only if we have an allocation site in the cell).
__ Addu(a3, a3, Operand(1));
__ lw(t1, FieldMemOperand(a2, Cell::kValueOffset));
if (FLAG_debug_code) {
__ lw(t1, FieldMemOperand(t1, 0));
__ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
__ Assert(eq, kExpectedAllocationSiteInCell, t1, Operand(at));
__ lw(t1, FieldMemOperand(a2, Cell::kValueOffset));
}
// Save the resulting elements kind in type info. We can't just store a3
// in the AllocationSite::transition_info field because elements kind is
// restricted to a portion of the field...upper bits need to be left alone.
STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
__ lw(t0, FieldMemOperand(t1, AllocationSite::kTransitionInfoOffset));
__ Addu(t0, t0, Operand(Smi::FromInt(kFastElementsKindPackedToHoley)));
__ sw(t0, FieldMemOperand(t1, AllocationSite::kTransitionInfoOffset));
__ bind(&normal_sequence);
int last_index = GetSequenceIndexFromFastElementsKind(
TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= last_index; ++i) {
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
ArraySingleArgumentConstructorStub stub(kind);
__ TailCallStub(&stub, eq, a3, Operand(kind));
}
// If we reached this point there is a problem.
__ Abort(kUnexpectedElementsKindInArrayConstructor);
} else {
UNREACHABLE();
}
}
template<class T>
static void ArrayConstructorStubAheadOfTimeHelper(Isolate* isolate) {
int to_index = GetSequenceIndexFromFastElementsKind(
TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= to_index; ++i) {
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
T stub(kind);
stub.GetCode(isolate);
if (AllocationSite::GetMode(kind) != DONT_TRACK_ALLOCATION_SITE) {
T stub1(kind, DISABLE_ALLOCATION_SITES);
stub1.GetCode(isolate);
}
}
}
void ArrayConstructorStubBase::GenerateStubsAheadOfTime(Isolate* isolate) {
ArrayConstructorStubAheadOfTimeHelper<ArrayNoArgumentConstructorStub>(
isolate);
ArrayConstructorStubAheadOfTimeHelper<ArraySingleArgumentConstructorStub>(
isolate);
ArrayConstructorStubAheadOfTimeHelper<ArrayNArgumentsConstructorStub>(
isolate);
}
void InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(
Isolate* isolate) {
ElementsKind kinds[2] = { FAST_ELEMENTS, FAST_HOLEY_ELEMENTS };
for (int i = 0; i < 2; i++) {
// For internal arrays we only need a few things.
InternalArrayNoArgumentConstructorStub stubh1(kinds[i]);
stubh1.GetCode(isolate);
InternalArraySingleArgumentConstructorStub stubh2(kinds[i]);
stubh2.GetCode(isolate);
InternalArrayNArgumentsConstructorStub stubh3(kinds[i]);
stubh3.GetCode(isolate);
}
}
void ArrayConstructorStub::GenerateDispatchToArrayStub(
MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
if (argument_count_ == ANY) {
Label not_zero_case, not_one_case;
__ And(at, a0, a0);
__ Branch(&not_zero_case, ne, at, Operand(zero_reg));
CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
__ bind(&not_zero_case);
__ Branch(&not_one_case, gt, a0, Operand(1));
CreateArrayDispatchOneArgument(masm, mode);
__ bind(&not_one_case);
CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
} else if (argument_count_ == NONE) {
CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
} else if (argument_count_ == ONE) {
CreateArrayDispatchOneArgument(masm, mode);
} else if (argument_count_ == MORE_THAN_ONE) {
CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
} else {
UNREACHABLE();
}
}
void ArrayConstructorStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : argc (only if argument_count_ == ANY)
// -- a1 : constructor
// -- a2 : type info cell
// -- sp[0] : return address
// -- sp[4] : last argument
// -----------------------------------
if (FLAG_debug_code) {
// The array construct code is only set for the global and natives
// builtin Array functions which always have maps.
// Initial map for the builtin Array function should be a map.
__ lw(a3, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
__ SmiTst(a3, at);
__ Assert(ne, kUnexpectedInitialMapForArrayFunction,
at, Operand(zero_reg));
__ GetObjectType(a3, a3, t0);
__ Assert(eq, kUnexpectedInitialMapForArrayFunction,
t0, Operand(MAP_TYPE));
// We should either have undefined in a2 or a valid cell.
Label okay_here;
Handle<Map> cell_map = masm->isolate()->factory()->cell_map();
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ Branch(&okay_here, eq, a2, Operand(at));
__ lw(a3, FieldMemOperand(a2, 0));
__ Assert(eq, kExpectedPropertyCellInRegisterA2,
a3, Operand(cell_map));
__ bind(&okay_here);
}
Label no_info;
// Get the elements kind and case on that.
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ Branch(&no_info, eq, a2, Operand(at));
__ lw(a3, FieldMemOperand(a2, Cell::kValueOffset));
// If the type cell is undefined, or contains anything other than an
// AllocationSite, call an array constructor that doesn't use AllocationSites.
__ lw(t0, FieldMemOperand(a3, 0));
__ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
__ Branch(&no_info, ne, t0, Operand(at));
__ lw(a3, FieldMemOperand(a3, AllocationSite::kTransitionInfoOffset));
__ SmiUntag(a3);
STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
__ And(a3, a3, Operand(AllocationSite::ElementsKindBits::kMask));
GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
__ bind(&no_info);
GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
}
void InternalArrayConstructorStub::GenerateCase(
MacroAssembler* masm, ElementsKind kind) {
InternalArrayNoArgumentConstructorStub stub0(kind);
__ TailCallStub(&stub0, lo, a0, Operand(1));
InternalArrayNArgumentsConstructorStub stubN(kind);
__ TailCallStub(&stubN, hi, a0, Operand(1));
if (IsFastPackedElementsKind(kind)) {
// We might need to create a holey array
// look at the first argument.
__ lw(at, MemOperand(sp, 0));
InternalArraySingleArgumentConstructorStub
stub1_holey(GetHoleyElementsKind(kind));
__ TailCallStub(&stub1_holey, ne, at, Operand(zero_reg));
}
InternalArraySingleArgumentConstructorStub stub1(kind);
__ TailCallStub(&stub1);
}
void InternalArrayConstructorStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : argc
// -- a1 : constructor
// -- sp[0] : return address
// -- sp[4] : last argument
// -----------------------------------
if (FLAG_debug_code) {
// The array construct code is only set for the global and natives
// builtin Array functions which always have maps.
// Initial map for the builtin Array function should be a map.
__ lw(a3, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
__ SmiTst(a3, at);
__ Assert(ne, kUnexpectedInitialMapForArrayFunction,
at, Operand(zero_reg));
__ GetObjectType(a3, a3, t0);
__ Assert(eq, kUnexpectedInitialMapForArrayFunction,
t0, Operand(MAP_TYPE));
}
// Figure out the right elements kind.
__ lw(a3, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
// Load the map's "bit field 2" into a3. We only need the first byte,
// but the following bit field extraction takes care of that anyway.
__ lbu(a3, FieldMemOperand(a3, Map::kBitField2Offset));
// Retrieve elements_kind from bit field 2.
__ Ext(a3, a3, Map::kElementsKindShift, Map::kElementsKindBitCount);
if (FLAG_debug_code) {
Label done;
__ Branch(&done, eq, a3, Operand(FAST_ELEMENTS));
__ Assert(
eq, kInvalidElementsKindForInternalArrayOrInternalPackedArray,
a3, Operand(FAST_HOLEY_ELEMENTS));
__ bind(&done);
}
Label fast_elements_case;
__ Branch(&fast_elements_case, eq, a3, Operand(FAST_ELEMENTS));
GenerateCase(masm, FAST_HOLEY_ELEMENTS);
__ bind(&fast_elements_case);
GenerateCase(masm, FAST_ELEMENTS);
}
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_MIPS