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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#if V8_TARGET_ARCH_PPC
#include "src/api-arguments.h"
#include "src/code-factory.h"
#include "src/counters.h"
#include "src/debug/debug.h"
#include "src/deoptimizer.h"
#include "src/frame-constants.h"
#include "src/frames.h"
// For interpreter_entry_return_pc_offset. TODO(jkummerow): Drop.
#include "src/heap/heap-inl.h"
#include "src/macro-assembler-inl.h"
#include "src/objects/cell.h"
#include "src/objects/foreign.h"
#include "src/objects/heap-number.h"
#include "src/objects/js-generator.h"
#include "src/objects/smi.h"
#include "src/register-configuration.h"
#include "src/runtime/runtime.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm, Address address,
ExitFrameType exit_frame_type) {
__ Move(kJavaScriptCallExtraArg1Register, ExternalReference::Create(address));
if (exit_frame_type == BUILTIN_EXIT) {
__ Jump(BUILTIN_CODE(masm->isolate(), AdaptorWithBuiltinExitFrame),
RelocInfo::CODE_TARGET);
} else {
DCHECK(exit_frame_type == EXIT);
__ Jump(BUILTIN_CODE(masm->isolate(), AdaptorWithExitFrame),
RelocInfo::CODE_TARGET);
}
}
void Builtins::Generate_InternalArrayConstructor(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : number of arguments
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
if (FLAG_debug_code) {
// Initial map for the builtin InternalArray functions should be maps.
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kPrototypeOrInitialMapOffset));
__ TestIfSmi(r5, r0);
__ Assert(ne, AbortReason::kUnexpectedInitialMapForInternalArrayFunction,
cr0);
__ CompareObjectType(r5, r6, r7, MAP_TYPE);
__ Assert(eq, AbortReason::kUnexpectedInitialMapForInternalArrayFunction);
}
// Run the native code for the InternalArray function called as a normal
// function.
__ Jump(BUILTIN_CODE(masm->isolate(), InternalArrayConstructorImpl),
RelocInfo::CODE_TARGET);
}
static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
Runtime::FunctionId function_id) {
// ----------- S t a t e -------------
// -- r3 : argument count (preserved for callee)
// -- r4 : target function (preserved for callee)
// -- r6 : new target (preserved for callee)
// -----------------------------------
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
// Push the number of arguments to the callee.
// Push a copy of the target function and the new target.
// Push function as parameter to the runtime call.
__ SmiTag(r3);
__ Push(r3, r4, r6, r4);
__ CallRuntime(function_id, 1);
__ mr(r5, r3);
// Restore target function and new target.
__ Pop(r3, r4, r6);
__ SmiUntag(r3);
}
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ JumpCodeObject(r5);
}
namespace {
void Generate_JSBuiltinsConstructStubHelper(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : number of arguments
// -- r4 : constructor function
// -- r6 : new target
// -- cp : context
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
// Enter a construct frame.
{
FrameAndConstantPoolScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ SmiTag(r3);
__ Push(cp, r3);
__ SmiUntag(r3, SetRC);
// The receiver for the builtin/api call.
__ PushRoot(RootIndex::kTheHoleValue);
// Set up pointer to last argument.
__ addi(r7, fp, Operand(StandardFrameConstants::kCallerSPOffset));
// Copy arguments and receiver to the expression stack.
Label loop, no_args;
// ----------- S t a t e -------------
// -- r3: number of arguments (untagged)
// -- r4: constructor function
// -- r6: new target
// -- r7: pointer to last argument
// -- cr0: condition indicating whether r3 is zero
// -- sp[0*kPointerSize]: the hole (receiver)
// -- sp[1*kPointerSize]: number of arguments (tagged)
// -- sp[2*kPointerSize]: context
// -----------------------------------
__ beq(&no_args, cr0);
__ ShiftLeftImm(ip, r3, Operand(kPointerSizeLog2));
__ sub(sp, sp, ip);
__ mtctr(r3);
__ bind(&loop);
__ subi(ip, ip, Operand(kPointerSize));
__ LoadPX(r0, MemOperand(r7, ip));
__ StorePX(r0, MemOperand(sp, ip));
__ bdnz(&loop);
__ bind(&no_args);
// Call the function.
// r3: number of arguments (untagged)
// r4: constructor function
// r6: new target
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm);
ParameterCount actual(r3);
__ InvokeFunction(r4, r6, actual, CALL_FUNCTION);
}
// Restore context from the frame.
__ LoadP(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// Restore smi-tagged arguments count from the frame.
__ LoadP(r4, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
__ SmiToPtrArrayOffset(r4, r4);
__ add(sp, sp, r4);
__ addi(sp, sp, Operand(kPointerSize));
__ blr();
}
void Generate_StackOverflowCheck(MacroAssembler* masm, Register num_args,
Register scratch, Label* stack_overflow) {
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
__ LoadRoot(scratch, RootIndex::kRealStackLimit);
// Make scratch the space we have left. The stack might already be overflowed
// here which will cause scratch to become negative.
__ sub(scratch, sp, scratch);
// Check if the arguments will overflow the stack.
__ ShiftLeftImm(r0, num_args, Operand(kPointerSizeLog2));
__ cmp(scratch, r0);
__ ble(stack_overflow); // Signed comparison.
}
} // namespace
// The construct stub for ES5 constructor functions and ES6 class constructors.
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3: number of arguments (untagged)
// -- r4: constructor function
// -- r6: new target
// -- cp: context
// -- lr: return address
// -- sp[...]: constructor arguments
// -----------------------------------
// Enter a construct frame.
{
FrameAndConstantPoolScope scope(masm, StackFrame::CONSTRUCT);
Label post_instantiation_deopt_entry, not_create_implicit_receiver;
// Preserve the incoming parameters on the stack.
__ SmiTag(r3);
__ Push(cp, r3, r4);
__ PushRoot(RootIndex::kUndefinedValue);
__ Push(r6);
// ----------- S t a t e -------------
// -- sp[0*kPointerSize]: new target
// -- sp[1*kPointerSize]: padding
// -- r4 and sp[2*kPointerSize]: constructor function
// -- sp[3*kPointerSize]: number of arguments (tagged)
// -- sp[4*kPointerSize]: context
// -----------------------------------
__ LoadP(r7, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ lwz(r7, FieldMemOperand(r7, SharedFunctionInfo::kFlagsOffset));
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(r7);
__ JumpIfIsInRange(r7, kDefaultDerivedConstructor, kDerivedConstructor,
&not_create_implicit_receiver);
// If not derived class constructor: Allocate the new receiver object.
__ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1,
r7, r8);
__ Call(BUILTIN_CODE(masm->isolate(), FastNewObject),
RelocInfo::CODE_TARGET);
__ b(&post_instantiation_deopt_entry);
// Else: use TheHoleValue as receiver for constructor call
__ bind(&not_create_implicit_receiver);
__ LoadRoot(r3, RootIndex::kTheHoleValue);
// ----------- S t a t e -------------
// -- r3: receiver
// -- Slot 4 / sp[0*kPointerSize]: new target
// -- Slot 3 / sp[1*kPointerSize]: padding
// -- Slot 2 / sp[2*kPointerSize]: constructor function
// -- Slot 1 / sp[3*kPointerSize]: number of arguments (tagged)
// -- Slot 0 / sp[4*kPointerSize]: context
// -----------------------------------
// Deoptimizer enters here.
masm->isolate()->heap()->SetConstructStubCreateDeoptPCOffset(
masm->pc_offset());
__ bind(&post_instantiation_deopt_entry);
// Restore new target.
__ Pop(r6);
// Push the allocated receiver to the stack. We need two copies
// because we may have to return the original one and the calling
// conventions dictate that the called function pops the receiver.
__ Push(r3, r3);
// ----------- S t a t e -------------
// -- r6: new target
// -- sp[0*kPointerSize]: implicit receiver
// -- sp[1*kPointerSize]: implicit receiver
// -- sp[2*kPointerSize]: padding
// -- sp[3*kPointerSize]: constructor function
// -- sp[4*kPointerSize]: number of arguments (tagged)
// -- sp[5*kPointerSize]: context
// -----------------------------------
// Restore constructor function and argument count.
__ LoadP(r4, MemOperand(fp, ConstructFrameConstants::kConstructorOffset));
__ LoadP(r3, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
__ SmiUntag(r3);
// Set up pointer to last argument.
__ addi(r7, fp, Operand(StandardFrameConstants::kCallerSPOffset));
Label enough_stack_space, stack_overflow;
Generate_StackOverflowCheck(masm, r3, r8, &stack_overflow);
__ b(&enough_stack_space);
__ bind(&stack_overflow);
// Restore the context from the frame.
__ LoadP(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowStackOverflow);
// Unreachable code.
__ bkpt(0);
__ bind(&enough_stack_space);
// Copy arguments and receiver to the expression stack.
Label loop, no_args;
// ----------- S t a t e -------------
// -- r3: number of arguments (untagged)
// -- r6: new target
// -- r7: pointer to last argument
// -- cr0: condition indicating whether r3 is zero
// -- sp[0*kPointerSize]: implicit receiver
// -- sp[1*kPointerSize]: implicit receiver
// -- sp[2*kPointerSize]: padding
// -- r4 and sp[3*kPointerSize]: constructor function
// -- sp[4*kPointerSize]: number of arguments (tagged)
// -- sp[5*kPointerSize]: context
// -----------------------------------
__ cmpi(r3, Operand::Zero());
__ beq(&no_args);
__ ShiftLeftImm(ip, r3, Operand(kPointerSizeLog2));
__ sub(sp, sp, ip);
__ mtctr(r3);
__ bind(&loop);
__ subi(ip, ip, Operand(kPointerSize));
__ LoadPX(r0, MemOperand(r7, ip));
__ StorePX(r0, MemOperand(sp, ip));
__ bdnz(&loop);
__ bind(&no_args);
// Call the function.
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm);
ParameterCount actual(r3);
__ InvokeFunction(r4, r6, actual, CALL_FUNCTION);
}
// ----------- S t a t e -------------
// -- r0: constructor result
// -- sp[0*kPointerSize]: implicit receiver
// -- sp[1*kPointerSize]: padding
// -- sp[2*kPointerSize]: constructor function
// -- sp[3*kPointerSize]: number of arguments
// -- sp[4*kPointerSize]: context
// -----------------------------------
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetConstructStubInvokeDeoptPCOffset(
masm->pc_offset());
// Restore the context from the frame.
__ LoadP(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// If the result is an object (in the ECMA sense), we should get rid
// of the receiver and use the result; see ECMA-262 section 13.2.2-7
// on page 74.
Label use_receiver, do_throw, leave_frame;
// If the result is undefined, we jump out to using the implicit receiver.
__ JumpIfRoot(r3, RootIndex::kUndefinedValue, &use_receiver);
// Otherwise we do a smi check and fall through to check if the return value
// is a valid receiver.
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(r3, &use_receiver);
// If the type of the result (stored in its map) is less than
// FIRST_JS_RECEIVER_TYPE, it is not an object in the ECMA sense.
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ CompareObjectType(r3, r7, r7, FIRST_JS_RECEIVER_TYPE);
__ bge(&leave_frame);
__ b(&use_receiver);
__ bind(&do_throw);
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ LoadP(r3, MemOperand(sp));
__ JumpIfRoot(r3, RootIndex::kTheHoleValue, &do_throw);
__ bind(&leave_frame);
// Restore smi-tagged arguments count from the frame.
__ LoadP(r4, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
__ SmiToPtrArrayOffset(r4, r4);
__ add(sp, sp, r4);
__ addi(sp, sp, Operand(kPointerSize));
__ blr();
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSBuiltinsConstructStubHelper(masm);
}
static void GetSharedFunctionInfoBytecode(MacroAssembler* masm,
Register sfi_data,
Register scratch1) {
Label done;
__ CompareObjectType(sfi_data, scratch1, scratch1, INTERPRETER_DATA_TYPE);
__ bne(&done);
__ LoadP(sfi_data,
FieldMemOperand(sfi_data, InterpreterData::kBytecodeArrayOffset));
__ bind(&done);
}
// static
void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : the value to pass to the generator
// -- r4 : the JSGeneratorObject to resume
// -- lr : return address
// -----------------------------------
__ AssertGeneratorObject(r4);
// Store input value into generator object.
__ StoreP(r3, FieldMemOperand(r4, JSGeneratorObject::kInputOrDebugPosOffset),
r0);
__ RecordWriteField(r4, JSGeneratorObject::kInputOrDebugPosOffset, r3, r6,
kLRHasNotBeenSaved, kDontSaveFPRegs);
// Load suspended function and context.
__ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
__ LoadP(cp, FieldMemOperand(r7, JSFunction::kContextOffset));
// Flood function if we are stepping.
Label prepare_step_in_if_stepping, prepare_step_in_suspended_generator;
Label stepping_prepared;
ExternalReference debug_hook =
ExternalReference::debug_hook_on_function_call_address(masm->isolate());
__ Move(ip, debug_hook);
__ LoadByte(ip, MemOperand(ip), r0);
__ extsb(ip, ip);
__ CmpSmiLiteral(ip, Smi::zero(), r0);
__ bne(&prepare_step_in_if_stepping);
// Flood function if we need to continue stepping in the suspended generator.
ExternalReference debug_suspended_generator =
ExternalReference::debug_suspended_generator_address(masm->isolate());
__ Move(ip, debug_suspended_generator);
__ LoadP(ip, MemOperand(ip));
__ cmp(ip, r4);
__ beq(&prepare_step_in_suspended_generator);
__ bind(&stepping_prepared);
// Check the stack for overflow. We are not trying to catch interruptions
// (i.e. debug break and preemption) here, so check the "real stack limit".
Label stack_overflow;
__ CompareRoot(sp, RootIndex::kRealStackLimit);
__ blt(&stack_overflow);
// Push receiver.
__ LoadP(ip, FieldMemOperand(r4, JSGeneratorObject::kReceiverOffset));
__ Push(ip);
// ----------- S t a t e -------------
// -- r4 : the JSGeneratorObject to resume
// -- r7 : generator function
// -- cp : generator context
// -- lr : return address
// -- sp[0] : generator receiver
// -----------------------------------
// Copy the function arguments from the generator object's register file.
__ LoadP(r6, FieldMemOperand(r7, JSFunction::kSharedFunctionInfoOffset));
__ LoadHalfWord(
r6, FieldMemOperand(r6, SharedFunctionInfo::kFormalParameterCountOffset));
__ LoadP(r5, FieldMemOperand(
r4, JSGeneratorObject::kParametersAndRegistersOffset));
{
Label loop, done_loop;
__ cmpi(r6, Operand::Zero());
__ ble(&done_loop);
// setup r9 to first element address - kPointerSize
__ addi(r9, r5,
Operand(FixedArray::kHeaderSize - kHeapObjectTag - kPointerSize));
__ mtctr(r6);
__ bind(&loop);
__ LoadPU(ip, MemOperand(r9, kPointerSize));
__ push(ip);
__ bdnz(&loop);
__ bind(&done_loop);
}
// Underlying function needs to have bytecode available.
if (FLAG_debug_code) {
__ LoadP(r6, FieldMemOperand(r7, JSFunction::kSharedFunctionInfoOffset));
__ LoadP(r6, FieldMemOperand(r6, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecode(masm, r6, r3);
__ CompareObjectType(r6, r6, r6, BYTECODE_ARRAY_TYPE);
__ Assert(eq, AbortReason::kMissingBytecodeArray);
}
// Resume (Ignition/TurboFan) generator object.
{
// We abuse new.target both to indicate that this is a resume call and to
// pass in the generator object. In ordinary calls, new.target is always
// undefined because generator functions are non-constructable.
__ mr(r6, r4);
__ mr(r4, r7);
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kCodeOffset));
__ JumpCodeObject(r5);
}
__ bind(&prepare_step_in_if_stepping);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r4, r7);
// Push hole as receiver since we do not use it for stepping.
__ PushRoot(RootIndex::kTheHoleValue);
__ CallRuntime(Runtime::kDebugOnFunctionCall);
__ Pop(r4);
__ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
}
__ b(&stepping_prepared);
__ bind(&prepare_step_in_suspended_generator);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r4);
__ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
__ Pop(r4);
__ LoadP(r7, FieldMemOperand(r4, JSGeneratorObject::kFunctionOffset));
}
__ b(&stepping_prepared);
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bkpt(0); // This should be unreachable.
}
}
void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ push(r4);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable);
}
namespace {
// Called with the native C calling convention. The corresponding function
// signature is either:
//
// using JSEntryFunction = GeneratedCode<Address(
// Address root_register_value, Address new_target, Address target,
// Address receiver, intptr_t argc, Address** args)>;
// or
// using JSEntryFunction = GeneratedCode<Address(
// Address root_register_value, MicrotaskQueue* microtask_queue)>;
void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
Builtins::Name entry_trampoline) {
// The register state is either:
// r3: root_register_value
// r4: code entry
// r5: function
// r6: receiver
// r7: argc
// r8: argv
// or
// r3: root_register_value
// r4: microtask_queue
Label invoke, handler_entry, exit;
{
NoRootArrayScope no_root_array(masm);
// PPC LINUX ABI:
// preserve LR in pre-reserved slot in caller's frame
__ mflr(r0);
__ StoreP(r0, MemOperand(sp, kStackFrameLRSlot * kPointerSize));
// Save callee saved registers on the stack.
__ MultiPush(kCalleeSaved);
// Save callee-saved double registers.
__ MultiPushDoubles(kCalleeSavedDoubles);
// Set up the reserved register for 0.0.
__ LoadDoubleLiteral(kDoubleRegZero, Double(0.0), r0);
// Initialize the root register.
// C calling convention. The first argument is passed in r3.
__ mr(kRootRegister, r3);
}
// Push a frame with special values setup to mark it as an entry frame.
// r4: code entry
// r5: function
// r6: receiver
// r7: argc
// r8: argv
__ li(r0, Operand(-1)); // Push a bad frame pointer to fail if it is used.
__ push(r0);
if (FLAG_enable_embedded_constant_pool) {
__ li(kConstantPoolRegister, Operand::Zero());
__ push(kConstantPoolRegister);
}
__ mov(r0, Operand(StackFrame::TypeToMarker(type)));
__ push(r0);
__ push(r0);
// Save copies of the top frame descriptor on the stack.
__ Move(r3, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ LoadP(r0, MemOperand(r3));
__ push(r0);
// Set up frame pointer for the frame to be pushed.
__ addi(fp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// If this is the outermost JS call, set js_entry_sp value.
Label non_outermost_js;
ExternalReference js_entry_sp =
ExternalReference::Create(IsolateAddressId::kJSEntrySPAddress,
masm->isolate());
__ Move(r3, js_entry_sp);
__ LoadP(r9, MemOperand(r3));
__ cmpi(r9, Operand::Zero());
__ bne(&non_outermost_js);
__ StoreP(fp, MemOperand(r3));
__ mov(ip, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
Label cont;
__ b(&cont);
__ bind(&non_outermost_js);
__ mov(ip, Operand(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
__ push(ip); // frame-type
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ b(&invoke);
// Block literal pool emission whilst taking the position of the handler
// entry. This avoids making the assumption that literal pools are always
// emitted after an instruction is emitted, rather than before.
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm);
__ bind(&handler_entry);
// Store the current pc as the handler offset. It's used later to create the
// handler table.
masm->isolate()->builtins()->SetJSEntryHandlerOffset(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 PushStackHandler below sets it to 0 to
// signal the existence of the JSEntry frame.
__ Move(ip,
ExternalReference::Create(IsolateAddressId::kPendingExceptionAddress,
masm->isolate()));
}
__ StoreP(r3, MemOperand(ip));
__ LoadRoot(r3, RootIndex::kException);
__ b(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
// Must preserve r4-r8.
__ PushStackHandler();
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the b(&invoke) above, which
// restores all kCalleeSaved registers (including cp and fp) to their
// saved values before returning a failure to C.
// 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.
// Invoke the function by calling through JS entry trampoline builtin and
// pop the faked function when we return.
Handle<Code> trampoline_code =
masm->isolate()->builtins()->builtin_handle(entry_trampoline);
__ Call(trampoline_code, RelocInfo::CODE_TARGET);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit); // r3 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(r8);
__ cmpi(r8, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ bne(&non_outermost_js_2);
__ mov(r9, Operand::Zero());
__ Move(r8, js_entry_sp);
__ StoreP(r9, MemOperand(r8));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(r6);
__ Move(ip, ExternalReference::Create(
IsolateAddressId::kCEntryFPAddress, masm->isolate()));
__ StoreP(r6, MemOperand(ip));
// Reset the stack to the callee saved registers.
__ addi(sp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// Restore callee-saved double registers.
__ MultiPopDoubles(kCalleeSavedDoubles);
// Restore callee-saved registers.
__ MultiPop(kCalleeSaved);
// Return
__ LoadP(r0, MemOperand(sp, kStackFrameLRSlot * kPointerSize));
__ mtlr(r0);
__ blr();
}
} // namespace
void Builtins::Generate_JSEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtins::kJSEntryTrampoline);
}
void Builtins::Generate_JSConstructEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::CONSTRUCT_ENTRY,
Builtins::kJSConstructEntryTrampoline);
}
void Builtins::Generate_JSRunMicrotasksEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtins::kRunMicrotasksTrampoline);
}
// Clobbers scratch1 and scratch2; preserves all other registers.
static void Generate_CheckStackOverflow(MacroAssembler* masm, Register argc,
Register scratch1, Register scratch2) {
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
Label okay;
__ LoadRoot(scratch1, RootIndex::kRealStackLimit);
// Make scratch1 the space we have left. The stack might already be overflowed
// here which will cause scratch1 to become negative.
__ sub(scratch1, sp, scratch1);
// Check if the arguments will overflow the stack.
__ ShiftLeftImm(scratch2, argc, Operand(kPointerSizeLog2));
__ cmp(scratch1, scratch2);
__ bgt(&okay); // Signed comparison.
// Out of stack space.
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bind(&okay);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// Called from Generate_JS_Entry
// r4: new.target
// r5: function
// r6: receiver
// r7: argc
// r8: argv
// r0,r3,r9, cp may be clobbered
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Setup the context (we need to use the caller context from the isolate).
ExternalReference context_address = ExternalReference::Create(
IsolateAddressId::kContextAddress, masm->isolate());
__ Move(cp, context_address);
__ LoadP(cp, MemOperand(cp));
// Push the function and the receiver onto the stack.
__ Push(r5, r6);
// Check if we have enough stack space to push all arguments.
// Clobbers r3 and r6.
Generate_CheckStackOverflow(masm, r7, r3, r6);
// r4: new.target
// r5: function
// r7: argc
// r8: argv
// r0,r3,r6,r9, cp may be clobbered
// Setup new.target, argc and function.
__ mr(r3, r7);
__ mr(r6, r4);
__ mr(r4, r5);
// r3: argc
// r4: function
// r6: new.target
// r8: argv
// Copy arguments to the stack in a loop.
// r4: function
// r3: argc
// r8: argv, i.e. points to first arg
Label loop, entry;
__ ShiftLeftImm(r0, r3, Operand(kPointerSizeLog2));
__ add(r5, r8, r0);
// r5 points past last arg.
__ b(&entry);
__ bind(&loop);
__ LoadP(r9, MemOperand(r8)); // read next parameter
__ addi(r8, r8, Operand(kPointerSize));
__ LoadP(r0, MemOperand(r9)); // dereference handle
__ push(r0); // push parameter
__ bind(&entry);
__ cmp(r8, r5);
__ bne(&loop);
// r3: argc
// r4: function
// r6: new.target
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(r7, RootIndex::kUndefinedValue);
__ mr(r8, r7);
__ mr(r14, r7);
__ mr(r15, r7);
__ mr(r16, r7);
__ mr(r17, r7);
// Invoke the code.
Handle<Code> builtin = is_construct
? BUILTIN_CODE(masm->isolate(), Construct)
: masm->isolate()->builtins()->Call();
__ Call(builtin, RelocInfo::CODE_TARGET);
// Exit the JS frame and remove the parameters (except function), and
// return.
}
__ blr();
// r3: result
}
void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, false);
}
void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, true);
}
void Builtins::Generate_RunMicrotasksTrampoline(MacroAssembler* masm) {
// This expects two C++ function parameters passed by Invoke() in
// execution.cc.
// r3: root_register_value
// r4: microtask_queue
__ mr(RunMicrotasksDescriptor::MicrotaskQueueRegister(), r4);
__ Jump(BUILTIN_CODE(masm->isolate(), RunMicrotasks), RelocInfo::CODE_TARGET);
}
static void ReplaceClosureCodeWithOptimizedCode(
MacroAssembler* masm, Register optimized_code, Register closure,
Register scratch1, Register scratch2, Register scratch3) {
// Store code entry in the closure.
__ StoreP(optimized_code, FieldMemOperand(closure, JSFunction::kCodeOffset),
r0);
__ mr(scratch1, optimized_code); // Write barrier clobbers scratch1 below.
__ RecordWriteField(closure, JSFunction::kCodeOffset, scratch1, scratch2,
kLRHasNotBeenSaved, kDontSaveFPRegs, OMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
}
static void LeaveInterpreterFrame(MacroAssembler* masm, Register scratch) {
Register args_count = scratch;
// Get the arguments + receiver count.
__ LoadP(args_count,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ lwz(args_count,
FieldMemOperand(args_count, BytecodeArray::kParameterSizeOffset));
// Leave the frame (also dropping the register file).
__ LeaveFrame(StackFrame::INTERPRETED);
__ add(sp, sp, args_count);
}
// Tail-call |function_id| if |smi_entry| == |marker|
static void TailCallRuntimeIfMarkerEquals(MacroAssembler* masm,
Register smi_entry,
OptimizationMarker marker,
Runtime::FunctionId function_id) {
Label no_match;
__ CmpSmiLiteral(smi_entry, Smi::FromEnum(marker), r0);
__ bne(&no_match);
GenerateTailCallToReturnedCode(masm, function_id);
__ bind(&no_match);
}
static void MaybeTailCallOptimizedCodeSlot(MacroAssembler* masm,
Register feedback_vector,
Register scratch1, Register scratch2,
Register scratch3) {
// ----------- S t a t e -------------
// -- r0 : argument count (preserved for callee if needed, and caller)
// -- r3 : new target (preserved for callee if needed, and caller)
// -- r1 : target function (preserved for callee if needed, and caller)
// -- feedback vector (preserved for caller if needed)
// -----------------------------------
DCHECK(
!AreAliased(feedback_vector, r3, r4, r6, scratch1, scratch2, scratch3));
Label optimized_code_slot_is_weak_ref, fallthrough;
Register closure = r4;
Register optimized_code_entry = scratch1;
__ LoadP(
optimized_code_entry,
FieldMemOperand(feedback_vector,
FeedbackVector::kOptimizedCodeWeakOrSmiOffset));
// Check if the code entry is a Smi. If yes, we interpret it as an
// optimisation marker. Otherwise, interpret it as a weak reference to a code
// object.
__ JumpIfNotSmi(optimized_code_entry, &optimized_code_slot_is_weak_ref);
{
// Optimized code slot is a Smi optimization marker.
// Fall through if no optimization trigger.
__ CmpSmiLiteral(optimized_code_entry,
Smi::FromEnum(OptimizationMarker::kNone), r0);
__ beq(&fallthrough);
TailCallRuntimeIfMarkerEquals(masm, optimized_code_entry,
OptimizationMarker::kLogFirstExecution,
Runtime::kFunctionFirstExecution);
TailCallRuntimeIfMarkerEquals(masm, optimized_code_entry,
OptimizationMarker::kCompileOptimized,
Runtime::kCompileOptimized_NotConcurrent);
TailCallRuntimeIfMarkerEquals(
masm, optimized_code_entry,
OptimizationMarker::kCompileOptimizedConcurrent,
Runtime::kCompileOptimized_Concurrent);
{
// Otherwise, the marker is InOptimizationQueue, so fall through hoping
// that an interrupt will eventually update the slot with optimized code.
if (FLAG_debug_code) {
__ CmpSmiLiteral(
optimized_code_entry,
Smi::FromEnum(OptimizationMarker::kInOptimizationQueue), r0);
__ Assert(eq, AbortReason::kExpectedOptimizationSentinel);
}
__ b(&fallthrough);
}
}
{
// Optimized code slot is a weak reference.
__ bind(&optimized_code_slot_is_weak_ref);
__ LoadWeakValue(optimized_code_entry, optimized_code_entry, &fallthrough);
// Check if the optimized code is marked for deopt. If it is, call the
// runtime to clear it.
Label found_deoptimized_code;
__ LoadP(scratch2, FieldMemOperand(optimized_code_entry,
Code::kCodeDataContainerOffset));
__ LoadWordArith(
scratch2,
FieldMemOperand(scratch2, CodeDataContainer::kKindSpecificFlagsOffset));
__ TestBit(scratch2, Code::kMarkedForDeoptimizationBit, r0);
__ bne(&found_deoptimized_code, cr0);
// Optimized code is good, get it into the closure and link the closure into
// the optimized functions list, then tail call the optimized code.
// The feedback vector is no longer used, so re-use it as a scratch
// register.
ReplaceClosureCodeWithOptimizedCode(masm, optimized_code_entry, closure,
scratch2, scratch3, feedback_vector);
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadCodeObjectEntry(r5, optimized_code_entry);
__ Jump(r5);
// Optimized code slot contains deoptimized code, evict it and re-enter the
// closure's code.
__ bind(&found_deoptimized_code);
GenerateTailCallToReturnedCode(masm, Runtime::kEvictOptimizedCodeSlot);
}
// Fall-through if the optimized code cell is clear and there is no
// optimization marker.
__ bind(&fallthrough);
}
// Advance the current bytecode offset. This simulates what all bytecode
// handlers do upon completion of the underlying operation. Will bail out to a
// label if the bytecode (without prefix) is a return bytecode.
static void AdvanceBytecodeOffsetOrReturn(MacroAssembler* masm,
Register bytecode_array,
Register bytecode_offset,
Register bytecode, Register scratch1,
Label* if_return) {
Register bytecode_size_table = scratch1;
Register scratch2 = bytecode;
DCHECK(!AreAliased(bytecode_array, bytecode_offset, bytecode_size_table,
bytecode));
__ Move(bytecode_size_table,
ExternalReference::bytecode_size_table_address());
// Check if the bytecode is a Wide or ExtraWide prefix bytecode.
Label process_bytecode, extra_wide;
STATIC_ASSERT(0 == static_cast<int>(interpreter::Bytecode::kWide));
STATIC_ASSERT(1 == static_cast<int>(interpreter::Bytecode::kExtraWide));
STATIC_ASSERT(2 == static_cast<int>(interpreter::Bytecode::kDebugBreakWide));
STATIC_ASSERT(3 ==
static_cast<int>(interpreter::Bytecode::kDebugBreakExtraWide));
__ cmpi(bytecode, Operand(0x3));
__ bgt(&process_bytecode);
__ andi(r0, bytecode, Operand(0x1));
__ bne(&extra_wide, cr0);
// Load the next bytecode and update table to the wide scaled table.
__ addi(bytecode_offset, bytecode_offset, Operand(1));
__ lbzx(bytecode, MemOperand(bytecode_array, bytecode_offset));
__ addi(bytecode_size_table, bytecode_size_table,
Operand(kIntSize * interpreter::Bytecodes::kBytecodeCount));
__ b(&process_bytecode);
__ bind(&extra_wide);
// Load the next bytecode and update table to the extra wide scaled table.
__ addi(bytecode_offset, bytecode_offset, Operand(1));
__ lbzx(bytecode, MemOperand(bytecode_array, bytecode_offset));
__ addi(bytecode_size_table, bytecode_size_table,
Operand(2 * kIntSize * interpreter::Bytecodes::kBytecodeCount));
// Load the size of the current bytecode.
__ bind(&process_bytecode);
// Bailout to the return label if this is a return bytecode.
#define JUMP_IF_EQUAL(NAME) \
__ cmpi(bytecode, \
Operand(static_cast<int>(interpreter::Bytecode::k##NAME))); \
__ beq(if_return);
RETURN_BYTECODE_LIST(JUMP_IF_EQUAL)
#undef JUMP_IF_EQUAL
// Otherwise, load the size of the current bytecode and advance the offset.
__ ShiftLeftImm(scratch2, bytecode, Operand(2));
__ lwzx(scratch2, MemOperand(bytecode_size_table, scratch2));
__ add(bytecode_offset, bytecode_offset, scratch2);
}
// Generate code for entering a JS function with the interpreter.
// On entry to the function the receiver and arguments have been pushed on the
// stack left to right. The actual argument count matches the formal parameter
// count expected by the function.
//
// The live registers are:
// o r4: the JS function object being called.
// o r6: the incoming new target or generator object
// o cp: our context
// o pp: the caller's constant pool pointer (if enabled)
// o fp: the caller's frame pointer
// o sp: stack pointer
// o lr: return address
//
// The function builds an interpreter frame. See InterpreterFrameConstants in
// frames.h for its layout.
void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
Register closure = r4;
Register feedback_vector = r5;
// Get the bytecode array from the function object and load it into
// kInterpreterBytecodeArrayRegister.
__ LoadP(r3, FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
// Load original bytecode array or the debug copy.
__ LoadP(kInterpreterBytecodeArrayRegister,
FieldMemOperand(r3, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecode(masm, kInterpreterBytecodeArrayRegister, r7);
// The bytecode array could have been flushed from the shared function info,
// if so, call into CompileLazy.
Label compile_lazy;
__ CompareObjectType(kInterpreterBytecodeArrayRegister, r3, no_reg,
BYTECODE_ARRAY_TYPE);
__ bne(&compile_lazy);
// Load the feedback vector from the closure.
__ LoadP(feedback_vector,
FieldMemOperand(closure, JSFunction::kFeedbackCellOffset));
__ LoadP(feedback_vector,
FieldMemOperand(feedback_vector, Cell::kValueOffset));
// Read off the optimized code slot in the feedback vector, and if there
// is optimized code or an optimization marker, call that instead.
MaybeTailCallOptimizedCodeSlot(masm, feedback_vector, r7, r9, r8);
// Increment invocation count for the function.
__ LoadWord(
r8,
FieldMemOperand(feedback_vector, FeedbackVector::kInvocationCountOffset),
r0);
__ addi(r8, r8, Operand(1));
__ StoreWord(
r8,
FieldMemOperand(feedback_vector, FeedbackVector::kInvocationCountOffset),
r0);
// Open a frame scope to indicate that there is a frame on the stack. The
// MANUAL indicates that the scope shouldn't actually generate code to set up
// the frame (that is done below).
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ PushStandardFrame(closure);
// Reset code age and the OSR arming. The OSR field and BytecodeAgeOffset are
// 8-bit fields next to each other, so we could just optimize by writing a
// 16-bit. These static asserts guard our assumption is valid.
STATIC_ASSERT(BytecodeArray::kBytecodeAgeOffset ==
BytecodeArray::kOSRNestingLevelOffset + kCharSize);
STATIC_ASSERT(BytecodeArray::kNoAgeBytecodeAge == 0);
__ li(r8, Operand(0));
__ StoreHalfWord(r8,
FieldMemOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kOSRNestingLevelOffset),
r0);
// Load initial bytecode offset.
__ mov(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
// Push bytecode array and Smi tagged bytecode array offset.
__ SmiTag(r3, kInterpreterBytecodeOffsetRegister);
__ Push(kInterpreterBytecodeArrayRegister, r3);
// Allocate the local and temporary register file on the stack.
{
// Load frame size (word) from the BytecodeArray object.
__ lwz(r5, FieldMemOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kFrameSizeOffset));
// Do a stack check to ensure we don't go over the limit.
Label ok;
__ sub(r8, sp, r5);
__ LoadRoot(r0, RootIndex::kRealStackLimit);
__ cmpl(r8, r0);
__ bge(&ok);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bind(&ok);
// If ok, push undefined as the initial value for all register file entries.
// TODO(rmcilroy): Consider doing more than one push per loop iteration.
Label loop, no_args;
__ LoadRoot(r8, RootIndex::kUndefinedValue);
__ ShiftRightImm(r5, r5, Operand(kPointerSizeLog2), SetRC);
__ beq(&no_args, cr0);
__ mtctr(r5);
__ bind(&loop);
__ push(r8);
__ bdnz(&loop);
__ bind(&no_args);
}
// If the bytecode array has a valid incoming new target or generator object
// register, initialize it with incoming value which was passed in r6.
Label no_incoming_new_target_or_generator_register;
__ LoadWordArith(
r8, FieldMemOperand(
kInterpreterBytecodeArrayRegister,
BytecodeArray::kIncomingNewTargetOrGeneratorRegisterOffset));
__ cmpi(r8, Operand::Zero());
__ beq(&no_incoming_new_target_or_generator_register);
__ ShiftLeftImm(r8, r8, Operand(kPointerSizeLog2));
__ StorePX(r6, MemOperand(fp, r8));
__ bind(&no_incoming_new_target_or_generator_register);
// Load accumulator with undefined.
__ LoadRoot(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
// Load the dispatch table into a register and dispatch to the bytecode
// handler at the current bytecode offset.
Label do_dispatch;
__ bind(&do_dispatch);
__ Move(
kInterpreterDispatchTableRegister,
ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
__ lbzx(r6, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
__ ShiftLeftImm(r6, r6, Operand(kPointerSizeLog2));
__ LoadPX(kJavaScriptCallCodeStartRegister,
MemOperand(kInterpreterDispatchTableRegister, r6));
__ Call(kJavaScriptCallCodeStartRegister);
masm->isolate()->heap()->SetInterpreterEntryReturnPCOffset(masm->pc_offset());
// Any returns to the entry trampoline are either due to the return bytecode
// or the interpreter tail calling a builtin and then a dispatch.
// Get bytecode array and bytecode offset from the stack frame.
__ LoadP(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ LoadP(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister);
// Either return, or advance to the next bytecode and dispatch.
Label do_return;
__ lbzx(r4, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
AdvanceBytecodeOffsetOrReturn(masm, kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, r4, r5,
&do_return);
__ b(&do_dispatch);
__ bind(&do_return);
// The return value is in r3.
LeaveInterpreterFrame(masm, r5);
__ blr();
__ bind(&compile_lazy);
GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
__ bkpt(0); // Should not return.
}
static void Generate_InterpreterPushArgs(MacroAssembler* masm,
Register num_args, Register index,
Register count, Register scratch) {
Label loop, skip;
__ cmpi(count, Operand::Zero());
__ beq(&skip);
__ addi(index, index, Operand(kPointerSize)); // Bias up for LoadPU
__ mtctr(count);
__ bind(&loop);
__ LoadPU(scratch, MemOperand(index, -kPointerSize));
__ push(scratch);
__ bdnz(&loop);
__ bind(&skip);
}
// static
void Builtins::Generate_InterpreterPushArgsThenCallImpl(
MacroAssembler* masm, ConvertReceiverMode receiver_mode,
InterpreterPushArgsMode mode) {
DCHECK(mode != InterpreterPushArgsMode::kArrayFunction);
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r5 : the address of the first argument to be pushed. Subsequent
// arguments should be consecutive above this, in the same order as
// they are to be pushed onto the stack.
// -- r4 : the target to call (can be any Object).
// -----------------------------------
Label stack_overflow;
// Calculate number of arguments (add one for receiver).
__ addi(r6, r3, Operand(1));
Generate_StackOverflowCheck(masm, r6, ip, &stack_overflow);
// Push "undefined" as the receiver arg if we need to.
if (receiver_mode == ConvertReceiverMode::kNullOrUndefined) {
__ PushRoot(RootIndex::kUndefinedValue);
__ mr(r6, r3); // Argument count is correct.
}
// Push the arguments. r5, r6, r7 will be modified.
Generate_InterpreterPushArgs(masm, r6, r5, r6, r7);
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
__ Pop(r5); // Pass the spread in a register
__ subi(r3, r3, Operand(1)); // Subtract one for spread
}
// Call the target.
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
__ Jump(BUILTIN_CODE(masm->isolate(), CallWithSpread),
RelocInfo::CODE_TARGET);
} else {
__ Jump(masm->isolate()->builtins()->Call(ConvertReceiverMode::kAny),
RelocInfo::CODE_TARGET);
}
__ bind(&stack_overflow);
{
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// Unreachable Code.
__ bkpt(0);
}
}
// static
void Builtins::Generate_InterpreterPushArgsThenConstructImpl(
MacroAssembler* masm, InterpreterPushArgsMode mode) {
// ----------- S t a t e -------------
// -- r3 : argument count (not including receiver)
// -- r6 : new target
// -- r4 : constructor to call
// -- r5 : allocation site feedback if available, undefined otherwise.
// -- r7 : address of the first argument
// -----------------------------------
Label stack_overflow;
// Push a slot for the receiver to be constructed.
__ li(r0, Operand::Zero());
__ push(r0);
// Push the arguments (skip if none).
Label skip;
__ cmpi(r3, Operand::Zero());
__ beq(&skip);
Generate_StackOverflowCheck(masm, r3, ip, &stack_overflow);
// Push the arguments. r8, r7, r9 will be modified.
Generate_InterpreterPushArgs(masm, r3, r7, r3, r9);
__ bind(&skip);
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
__ Pop(r5); // Pass the spread in a register
__ subi(r3, r3, Operand(1)); // Subtract one for spread
} else {
__ AssertUndefinedOrAllocationSite(r5, r8);
}
if (mode == InterpreterPushArgsMode::kArrayFunction) {
__ AssertFunction(r4);
// Tail call to the array construct stub (still in the caller
// context at this point).
Handle<Code> code = BUILTIN_CODE(masm->isolate(), ArrayConstructorImpl);
__ Jump(code, RelocInfo::CODE_TARGET);
} else if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
// Call the constructor with r3, r4, and r6 unmodified.
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructWithSpread),
RelocInfo::CODE_TARGET);
} else {
DCHECK_EQ(InterpreterPushArgsMode::kOther, mode);
// Call the constructor with r3, r4, and r6 unmodified.
__ Jump(BUILTIN_CODE(masm->isolate(), Construct), RelocInfo::CODE_TARGET);
}
__ bind(&stack_overflow);
{
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// Unreachable Code.
__ bkpt(0);
}
}
static void Generate_InterpreterEnterBytecode(MacroAssembler* masm) {
// Set the return address to the correct point in the interpreter entry
// trampoline.
Label builtin_trampoline, trampoline_loaded;
Smi interpreter_entry_return_pc_offset(
masm->isolate()->heap()->interpreter_entry_return_pc_offset());
DCHECK_NE(interpreter_entry_return_pc_offset, Smi::zero());
// If the SFI function_data is an InterpreterData, the function will have a
// custom copy of the interpreter entry trampoline for profiling. If so,
// get the custom trampoline, otherwise grab the entry address of the global
// trampoline.
__ LoadP(r5, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
__ LoadP(r5, FieldMemOperand(r5, JSFunction::kSharedFunctionInfoOffset));
__ LoadP(r5, FieldMemOperand(r5, SharedFunctionInfo::kFunctionDataOffset));
__ CompareObjectType(r5, kInterpreterDispatchTableRegister,
kInterpreterDispatchTableRegister,
INTERPRETER_DATA_TYPE);
__ bne(&builtin_trampoline);
__ LoadP(r5,
FieldMemOperand(r5, InterpreterData::kInterpreterTrampolineOffset));
__ addi(r5, r5, Operand(Code::kHeaderSize - kHeapObjectTag));
__ b(&trampoline_loaded);
__ bind(&builtin_trampoline);
__ Move(r5, ExternalReference::
address_of_interpreter_entry_trampoline_instruction_start(
masm->isolate()));
__ LoadP(r5, MemOperand(r5));
__ bind(&trampoline_loaded);
__ addi(r0, r5, Operand(interpreter_entry_return_pc_offset->value()));
__ mtlr(r0);
// Initialize the dispatch table register.
__ Move(
kInterpreterDispatchTableRegister,
ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
// Get the bytecode array pointer from the frame.
__ LoadP(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
if (FLAG_debug_code) {
// Check function data field is actually a BytecodeArray object.
__ TestIfSmi(kInterpreterBytecodeArrayRegister, r0);
__ Assert(ne,
AbortReason::kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry,
cr0);
__ CompareObjectType(kInterpreterBytecodeArrayRegister, r4, no_reg,
BYTECODE_ARRAY_TYPE);
__ Assert(
eq, AbortReason::kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
}
// Get the target bytecode offset from the frame.
__ LoadP(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister);
// Dispatch to the target bytecode.
__ lbzx(ip, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
__ ShiftLeftImm(ip, ip, Operand(kPointerSizeLog2));
__ LoadPX(kJavaScriptCallCodeStartRegister,
MemOperand(kInterpreterDispatchTableRegister, ip));
__ Jump(kJavaScriptCallCodeStartRegister);
}
void Builtins::Generate_InterpreterEnterBytecodeAdvance(MacroAssembler* masm) {
// Get bytecode array and bytecode offset from the stack frame.
__ LoadP(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ LoadP(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister);
// Load the current bytecode.
__ lbzx(r4, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
// Advance to the next bytecode.
Label if_return;
AdvanceBytecodeOffsetOrReturn(masm, kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, r4, r5,
&if_return);
// Convert new bytecode offset to a Smi and save in the stackframe.
__ SmiTag(r5, kInterpreterBytecodeOffsetRegister);
__ StoreP(r5,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
Generate_InterpreterEnterBytecode(masm);
// We should never take the if_return path.
__ bind(&if_return);
__ Abort(AbortReason::kInvalidBytecodeAdvance);
}
void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
Generate_InterpreterEnterBytecode(masm);
}
void Builtins::Generate_InstantiateAsmJs(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : argument count (preserved for callee)
// -- r4 : new target (preserved for callee)
// -- r6 : target function (preserved for callee)
// -----------------------------------
Label failed;
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Preserve argument count for later compare.
__ Move(r7, r3);
// Push a copy of the target function and the new target.
// Push function as parameter to the runtime call.
__ SmiTag(r3);
__ Push(r3, r4, r6, r4);
// Copy arguments from caller (stdlib, foreign, heap).
Label args_done;
for (int j = 0; j < 4; ++j) {
Label over;
if (j < 3) {
__ cmpi(r7, Operand(j));
__ bne(&over);
}
for (int i = j - 1; i >= 0; --i) {
__ LoadP(r7, MemOperand(fp, StandardFrameConstants::kCallerSPOffset +
i * kPointerSize));
__ push(r7);
}
for (int i = 0; i < 3 - j; ++i) {
__ PushRoot(RootIndex::kUndefinedValue);
}
if (j < 3) {
__ jmp(&args_done);
__ bind(&over);
}
}
__ bind(&args_done);
// Call runtime, on success unwind frame, and parent frame.
__ CallRuntime(Runtime::kInstantiateAsmJs, 4);
// A smi 0 is returned on failure, an object on success.
__ JumpIfSmi(r3, &failed);
__ Drop(2);
__ pop(r7);
__ SmiUntag(r7);
scope.GenerateLeaveFrame();
__ addi(r7, r7, Operand(1));
__ Drop(r7);
__ Ret();
__ bind(&failed);
// Restore target function and new target.
__ Pop(r3, r4, r6);
__ SmiUntag(r3);
}
// On failure, tail call back to regular js by re-calling the function
// which has be reset to the compile lazy builtin.
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kCodeOffset));
__ JumpCodeObject(r5);
}
namespace {
void Generate_ContinueToBuiltinHelper(MacroAssembler* masm,
bool java_script_builtin,
bool with_result) {
const RegisterConfiguration* config(RegisterConfiguration::Default());
int allocatable_register_count = config->num_allocatable_general_registers();
if (with_result) {
// Overwrite the hole inserted by the deoptimizer with the return value from
// the LAZY deopt point.
__ StoreP(
r3, MemOperand(
sp, config->num_allocatable_general_registers() * kPointerSize +
BuiltinContinuationFrameConstants::kFixedFrameSize));
}
for (int i = allocatable_register_count - 1; i >= 0; --i) {
int code = config->GetAllocatableGeneralCode(i);
__ Pop(Register::from_code(code));
if (java_script_builtin && code == kJavaScriptCallArgCountRegister.code()) {
__ SmiUntag(Register::from_code(code));
}
}
__ LoadP(
fp,
MemOperand(sp, BuiltinContinuationFrameConstants::kFixedFrameSizeFromFp));
__ Pop(ip);
__ addi(sp, sp,
Operand(BuiltinContinuationFrameConstants::kFixedFrameSizeFromFp));
__ Pop(r0);
__ mtlr(r0);
__ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(ip);
}
} // namespace
void Builtins::Generate_ContinueToCodeStubBuiltin(MacroAssembler* masm) {
Generate_ContinueToBuiltinHelper(masm, false, false);
}
void Builtins::Generate_ContinueToCodeStubBuiltinWithResult(
MacroAssembler* masm) {
Generate_ContinueToBuiltinHelper(masm, false, true);
}
void Builtins::Generate_ContinueToJavaScriptBuiltin(MacroAssembler* masm) {
Generate_ContinueToBuiltinHelper(masm, true, false);
}
void Builtins::Generate_ContinueToJavaScriptBuiltinWithResult(
MacroAssembler* masm) {
Generate_ContinueToBuiltinHelper(masm, true, true);
}
void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kNotifyDeoptimized);
}
DCHECK_EQ(kInterpreterAccumulatorRegister.code(), r3.code());
__ LoadP(r3, MemOperand(sp, 0 * kPointerSize));
__ addi(sp, sp, Operand(1 * kPointerSize));
__ Ret();
}
void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
// Lookup the function in the JavaScript frame.
__ LoadP(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ LoadP(r3, MemOperand(r3, JavaScriptFrameConstants::kFunctionOffset));
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
// Pass function as argument.
__ push(r3);
__ CallRuntime(Runtime::kCompileForOnStackReplacement);
}
// If the code object is null, just return to the caller.
Label skip;
__ CmpSmiLiteral(r3, Smi::zero(), r0);
__ bne(&skip);
__ Ret();
__ bind(&skip);
// Drop the handler frame that is be sitting on top of the actual
// JavaScript frame. This is the case then OSR is triggered from bytecode.
__ LeaveFrame(StackFrame::STUB);
// Load deoptimization data from the code object.
// <deopt_data> = <code>[#deoptimization_data_offset]
__ LoadP(r4, FieldMemOperand(r3, Code::kDeoptimizationDataOffset));
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm);
__ addi(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag)); // Code start
if (FLAG_enable_embedded_constant_pool) {
__ LoadConstantPoolPointerRegisterFromCodeTargetAddress(r3);
}
// Load the OSR entrypoint offset from the deoptimization data.
// <osr_offset> = <deopt_data>[#header_size + #osr_pc_offset]
__ LoadP(r4,
FieldMemOperand(r4, FixedArray::OffsetOfElementAt(
DeoptimizationData::kOsrPcOffsetIndex)));
__ SmiUntag(r4);
// Compute the target address = code start + osr_offset
__ add(r0, r3, r4);
// And "return" to the OSR entry point of the function.
__ mtlr(r0);
__ blr();
}
}
// static
void Builtins::Generate_FunctionPrototypeApply(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : argc
// -- sp[0] : argArray
// -- sp[4] : thisArg
// -- sp[8] : receiver
// -----------------------------------
// 1. Load receiver into r4, argArray into r5 (if present), remove all
// arguments from the stack (including the receiver), and push thisArg (if
// present) instead.
{
Label skip;
Register arg_size = r8;
Register new_sp = r6;
Register scratch = r7;
__ ShiftLeftImm(arg_size, r3, Operand(kPointerSizeLog2));
__ add(new_sp, sp, arg_size);
__ LoadRoot(scratch, RootIndex::kUndefinedValue);
__ mr(r5, scratch);
__ LoadP(r4, MemOperand(new_sp, 0)); // receiver
__ cmpi(arg_size, Operand(kPointerSize));
__ blt(&skip);
__ LoadP(scratch, MemOperand(new_sp, 1 * -kPointerSize)); // thisArg
__ beq(&skip);
__ LoadP(r5, MemOperand(new_sp, 2 * -kPointerSize)); // argArray
__ bind(&skip);
__ mr(sp, new_sp);
__ StoreP(scratch, MemOperand(sp, 0));
}
// ----------- S t a t e -------------
// -- r5 : argArray
// -- r4 : receiver
// -- sp[0] : thisArg
// -----------------------------------
// 2. We don't need to check explicitly for callable receiver here,
// since that's the first thing the Call/CallWithArrayLike builtins
// will do.
// 3. Tail call with no arguments if argArray is null or undefined.
Label no_arguments;
__ JumpIfRoot(r5, RootIndex::kNullValue, &no_arguments);
__ JumpIfRoot(r5, RootIndex::kUndefinedValue, &no_arguments);
// 4a. Apply the receiver to the given argArray.
__ Jump(BUILTIN_CODE(masm->isolate(), CallWithArrayLike),
RelocInfo::CODE_TARGET);
// 4b. The argArray is either null or undefined, so we tail call without any
// arguments to the receiver.
__ bind(&no_arguments);
{
__ li(r3, Operand::Zero());
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
}
// static
void Builtins::Generate_FunctionPrototypeCall(MacroAssembler* masm) {
// 1. Make sure we have at least one argument.
// r3: actual number of arguments
{
Label done;
__ cmpi(r3, Operand::Zero());
__ bne(&done);
__ PushRoot(RootIndex::kUndefinedValue);
__ addi(r3, r3, Operand(1));
__ bind(&done);
}
// 2. Get the callable to call (passed as receiver) from the stack.
// r3: actual number of arguments
__ ShiftLeftImm(r5, r3, Operand(kPointerSizeLog2));
__ LoadPX(r4, MemOperand(sp, r5));
// 3. Shift arguments and return address one slot down on the stack
// (overwriting the original receiver). Adjust argument count to make
// the original first argument the new receiver.
// r3: actual number of arguments
// r4: callable
{
Label loop;
// Calculate the copy start address (destination). Copy end address is sp.
__ add(r5, sp, r5);
__ mtctr(r3);
__ bind(&loop);
__ LoadP(ip, MemOperand(r5, -kPointerSize));
__ StoreP(ip, MemOperand(r5));
__ subi(r5, r5, Operand(kPointerSize));
__ bdnz(&loop);
// Adjust the actual number of arguments and remove the top element
// (which is a copy of the last argument).
__ subi(r3, r3, Operand(1));
__ pop();
}
// 4. Call the callable.
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : argc
// -- sp[0] : argumentsList
// -- sp[4] : thisArgument
// -- sp[8] : target
// -- sp[12] : receiver
// -----------------------------------
// 1. Load target into r4 (if present), argumentsList into r5 (if present),
// remove all arguments from the stack (including the receiver), and push
// thisArgument (if present) instead.
{
Label skip;
Register arg_size = r8;
Register new_sp = r6;
Register scratch = r7;
__ ShiftLeftImm(arg_size, r3, Operand(kPointerSizeLog2));
__ add(new_sp, sp, arg_size);
__ LoadRoot(r4, RootIndex::kUndefinedValue);
__ mr(scratch, r4);
__ mr(r5, r4);
__ cmpi(arg_size, Operand(kPointerSize));
__ blt(&skip);
__ LoadP(r4, MemOperand(new_sp, 1 * -kPointerSize)); // target
__ beq(&skip);
__ LoadP(scratch, MemOperand(new_sp, 2 * -kPointerSize)); // thisArgument
__ cmpi(arg_size, Operand(2 * kPointerSize));
__ beq(&skip);
__ LoadP(r5, MemOperand(new_sp, 3 * -kPointerSize)); // argumentsList
__ bind(&skip);
__ mr(sp, new_sp);
__ StoreP(scratch, MemOperand(sp, 0));
}
// ----------- S t a t e -------------
// -- r5 : argumentsList
// -- r4 : target
// -- sp[0] : thisArgument
// -----------------------------------
// 2. We don't need to check explicitly for callable target here,
// since that's the first thing the Call/CallWithArrayLike builtins
// will do.
// 3. Apply the target to the given argumentsList.
__ Jump(BUILTIN_CODE(masm->isolate(), CallWithArrayLike),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : argc
// -- sp[0] : new.target (optional)
// -- sp[4] : argumentsList
// -- sp[8] : target
// -- sp[12] : receiver
// -----------------------------------
// 1. Load target into r4 (if present), argumentsList into r5 (if present),
// new.target into r6 (if present, otherwise use target), remove all
// arguments from the stack (including the receiver), and push thisArgument
// (if present) instead.
{
Label skip;
Register arg_size = r8;
Register new_sp = r7;
__ ShiftLeftImm(arg_size, r3, Operand(kPointerSizeLog2));
__ add(new_sp, sp, arg_size);
__ LoadRoot(r4, RootIndex::kUndefinedValue);
__ mr(r5, r4);
__ mr(r6, r4);
__ StoreP(r4, MemOperand(new_sp, 0)); // receiver (undefined)
__ cmpi(arg_size, Operand(kPointerSize));
__ blt(&skip);
__ LoadP(r4, MemOperand(new_sp, 1 * -kPointerSize)); // target
__ mr(r6, r4); // new.target defaults to target
__ beq(&skip);
__ LoadP(r5, MemOperand(new_sp, 2 * -kPointerSize)); // argumentsList
__ cmpi(arg_size, Operand(2 * kPointerSize));
__ beq(&skip);
__ LoadP(r6, MemOperand(new_sp, 3 * -kPointerSize)); // new.target
__ bind(&skip);
__ mr(sp, new_sp);
}
// ----------- S t a t e -------------
// -- r5 : argumentsList
// -- r6 : new.target
// -- r4 : target
// -- sp[0] : receiver (undefined)
// -----------------------------------
// 2. We don't need to check explicitly for constructor target here,
// since that's the first thing the Construct/ConstructWithArrayLike
// builtins will do.
// 3. We don't need to check explicitly for constructor new.target here,
// since that's the second thing the Construct/ConstructWithArrayLike
// builtins will do.
// 4. Construct the target with the given new.target and argumentsList.
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructWithArrayLike),
RelocInfo::CODE_TARGET);
}
static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
__ SmiTag(r3);
__ mov(r7, Operand(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
__ mflr(r0);
__ push(r0);
if (FLAG_enable_embedded_constant_pool) {
__ Push(fp, kConstantPoolRegister, r7, r4, r3);
} else {
__ Push(fp, r7, r4, r3);
}
__ Push(Smi::zero()); // Padding.
__ addi(fp, sp,
Operand(ArgumentsAdaptorFrameConstants::kFixedFrameSizeFromFp));
}
static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : result being passed through
// -----------------------------------
// Get the number of arguments passed (as a smi), tear down the frame and
// then tear down the parameters.
__ LoadP(r4, MemOperand(fp, ArgumentsAdaptorFrameConstants::kLengthOffset));
int stack_adjustment = kPointerSize; // adjust for receiver
__ LeaveFrame(StackFrame::ARGUMENTS_ADAPTOR, stack_adjustment);
__ SmiToPtrArrayOffset(r0, r4);
__ add(sp, sp, r0);
}
// static
void Builtins::Generate_CallOrConstructVarargs(MacroAssembler* masm,
Handle<Code> code) {
// ----------- S t a t e -------------
// -- r4 : target
// -- r3 : number of parameters on the stack (not including the receiver)
// -- r5 : arguments list (a FixedArray)
// -- r7 : len (number of elements to push from args)
// -- r6 : new.target (for [[Construct]])
// -----------------------------------
Register scratch = ip;
if (masm->emit_debug_code()) {
// Allow r5 to be a FixedArray, or a FixedDoubleArray if r7 == 0.
Label ok, fail;
__ AssertNotSmi(r5);
__ LoadP(scratch, FieldMemOperand(r5, HeapObject::kMapOffset));
__ LoadHalfWord(scratch,
FieldMemOperand(scratch, Map::kInstanceTypeOffset));
__ cmpi(scratch, Operand(FIXED_ARRAY_TYPE));
__ beq(&ok);
__ cmpi(scratch, Operand(FIXED_DOUBLE_ARRAY_TYPE));
__ bne(&fail);
__ cmpi(r7, Operand::Zero());
__ beq(&ok);
// Fall through.
__ bind(&fail);
__ Abort(AbortReason::kOperandIsNotAFixedArray);
__ bind(&ok);
}
// Check for stack overflow.
Label stack_overflow;
Generate_StackOverflowCheck(masm, r7, ip, &stack_overflow);
// Push arguments onto the stack (thisArgument is already on the stack).
{
Label loop, no_args, skip;
__ cmpi(r7, Operand::Zero());
__ beq(&no_args);
__ addi(r5, r5,
Operand(FixedArray::kHeaderSize - kHeapObjectTag - kPointerSize));
__ mtctr(r7);
__ bind(&loop);
__ LoadPU(ip, MemOperand(r5, kPointerSize));
__ CompareRoot(ip, RootIndex::kTheHoleValue);
__ bne(&skip);
__ LoadRoot(ip, RootIndex::kUndefinedValue);
__ bind(&skip);
__ push(ip);
__ bdnz(&loop);
__ bind(&no_args);
__ add(r3, r3, r7);
}
// Tail-call to the actual Call or Construct builtin.
__ Jump(code, RelocInfo::CODE_TARGET);
__ bind(&stack_overflow);
__ TailCallRuntime(Runtime::kThrowStackOverflow);
}
// static
void Builtins::Generate_CallOrConstructForwardVarargs(MacroAssembler* masm,
CallOrConstructMode mode,
Handle<Code> code) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r6 : the new.target (for [[Construct]] calls)
// -- r4 : the target to call (can be any Object)
// -- r5 : start index (to support rest parameters)
// -----------------------------------
Register scratch = r9;
if (mode == CallOrConstructMode::kConstruct) {
Label new_target_constructor, new_target_not_constructor;
__ JumpIfSmi(r6, &new_target_not_constructor);
__ LoadP(scratch, FieldMemOperand(r6, HeapObject::kMapOffset));
__ lbz(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
__ TestBit(scratch, Map::IsConstructorBit::kShift, r0);
__ bne(&new_target_constructor, cr0);
__ bind(&new_target_not_constructor);
{
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::INTERNAL);
__ Push(r6);
__ CallRuntime(Runtime::kThrowNotConstructor);
}
__ bind(&new_target_constructor);
}
// Check if we have an arguments adaptor frame below the function frame.
Label arguments_adaptor, arguments_done;
__ LoadP(r7, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ LoadP(ip, MemOperand(r7, CommonFrameConstants::kContextOrFrameTypeOffset));
__ cmpi(ip, Operand(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
__ beq(&arguments_adaptor);
{
__ LoadP(r8, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ LoadP(r8, FieldMemOperand(r8, JSFunction::kSharedFunctionInfoOffset));
__ LoadHalfWord(
r8,
FieldMemOperand(r8, SharedFunctionInfo::kFormalParameterCountOffset));
__ mr(r7, fp);
}
__ b(&arguments_done);
__ bind(&arguments_adaptor);
{
// Load the length from the ArgumentsAdaptorFrame.
__ LoadP(r8, MemOperand(r7, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ SmiUntag(r8);
}
__ bind(&arguments_done);
Label stack_done, stack_overflow;
__ sub(r8, r8, r5);
__ cmpi(r8, Operand::Zero());
__ ble(&stack_done);
{
// Check for stack overflow.
Generate_StackOverflowCheck(masm, r8, r5, &stack_overflow);
// Forward the arguments from the caller frame.
{
Label loop;
__ addi(r7, r7, Operand(kPointerSize));
__ add(r3, r3, r8);
__ bind(&loop);
{
__ ShiftLeftImm(ip, r8, Operand(kPointerSizeLog2));
__ LoadPX(ip, MemOperand(r7, ip));
__ push(ip);
__ subi(r8, r8, Operand(1));
__ cmpi(r8, Operand::Zero());
__ bne(&loop);
}
}
}
__ b(&stack_done);
__ bind(&stack_overflow);
__ TailCallRuntime(Runtime::kThrowStackOverflow);
__ bind(&stack_done);
// Tail-call to the {code} handler.
__ Jump(code, RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_CallFunction(MacroAssembler* masm,
ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the function to call (checked to be a JSFunction)
// -----------------------------------
__ AssertFunction(r4);
// See ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
// Check that the function is not a "classConstructor".
Label class_constructor;
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ lwz(r6, FieldMemOperand(r5, SharedFunctionInfo::kFlagsOffset));
__ TestBitMask(r6, SharedFunctionInfo::IsClassConstructorBit::kMask, r0);
__ bne(&class_constructor, cr0);
// Enter the context of the function; ToObject has to run in the function
// context, and we also need to take the global proxy from the function
// context in case of conversion.
__ LoadP(cp, FieldMemOperand(r4, JSFunction::kContextOffset));
// We need to convert the receiver for non-native sloppy mode functions.
Label done_convert;
__ andi(r0, r6,
Operand(SharedFunctionInfo::IsStrictBit::kMask |
SharedFunctionInfo::IsNativeBit::kMask));
__ bne(&done_convert, cr0);
{
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the function to call (checked to be a JSFunction)
// -- r5 : the shared function info.
// -- cp : the function context.
// -----------------------------------
if (mode == ConvertReceiverMode::kNullOrUndefined) {
// Patch receiver to global proxy.
__ LoadGlobalProxy(r6);
} else {
Label convert_to_object, convert_receiver;
__ ShiftLeftImm(r6, r3, Operand(kPointerSizeLog2));
__ LoadPX(r6, MemOperand(sp, r6));
__ JumpIfSmi(r6, &convert_to_object);
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ CompareObjectType(r6, r7, r7, FIRST_JS_RECEIVER_TYPE);
__ bge(&done_convert);
if (mode != ConvertReceiverMode::kNotNullOrUndefined) {
Label convert_global_proxy;
__ JumpIfRoot(r6, RootIndex::kUndefinedValue, &convert_global_proxy);
__ JumpIfNotRoot(r6, RootIndex::kNullValue, &convert_to_object);
__ bind(&convert_global_proxy);
{
// Patch receiver to global proxy.
__ LoadGlobalProxy(r6);
}
__ b(&convert_receiver);
}
__ bind(&convert_to_object);
{
// Convert receiver using ToObject.
// TODO(bmeurer): Inline the allocation here to avoid building the frame
// in the fast case? (fall back to AllocateInNewSpace?)
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ SmiTag(r3);
__ Push(r3, r4);
__ mr(r3, r6);
__ Push(cp);
__ Call(BUILTIN_CODE(masm->isolate(), ToObject),
RelocInfo::CODE_TARGET);
__ Pop(cp);
__ mr(r6, r3);
__ Pop(r3, r4);
__ SmiUntag(r3);
}
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ bind(&convert_receiver);
}
__ ShiftLeftImm(r7, r3, Operand(kPointerSizeLog2));
__ StorePX(r6, MemOperand(sp, r7));
}
__ bind(&done_convert);
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the function to call (checked to be a JSFunction)
// -- r5 : the shared function info.
// -- cp : the function context.
// -----------------------------------
__ LoadHalfWord(
r5, FieldMemOperand(r5, SharedFunctionInfo::kFormalParameterCountOffset));
ParameterCount actual(r3);
ParameterCount expected(r5);
__ InvokeFunctionCode(r4, no_reg, expected, actual, JUMP_FUNCTION);
// The function is a "classConstructor", need to raise an exception.
__ bind(&class_constructor);
{
FrameAndConstantPoolScope frame(masm, StackFrame::INTERNAL);
__ push(r4);
__ CallRuntime(Runtime::kThrowConstructorNonCallableError);
}
}
namespace {
void Generate_PushBoundArguments(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : target (checked to be a JSBoundFunction)
// -- r6 : new.target (only in case of [[Construct]])
// -----------------------------------
// Load [[BoundArguments]] into r5 and length of that into r7.
Label no_bound_arguments;
__ LoadP(r5, FieldMemOperand(r4, JSBoundFunction::kBoundArgumentsOffset));
__ LoadP(r7, FieldMemOperand(r5, FixedArray::kLengthOffset));
__ SmiUntag(r7, SetRC);
__ beq(&no_bound_arguments, cr0);
{
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : target (checked to be a JSBoundFunction)
// -- r5 : the [[BoundArguments]] (implemented as FixedArray)
// -- r6 : new.target (only in case of [[Construct]])
// -- r7 : the number of [[BoundArguments]]
// -----------------------------------
// Reserve stack space for the [[BoundArguments]].
{
Label done;
__ mr(r9, sp); // preserve previous stack pointer
__ ShiftLeftImm(r10, r7, Operand(kPointerSizeLog2));
__ sub(sp, sp, r10);
// Check the stack for overflow. We are not trying to catch interruptions
// (i.e. debug break and preemption) here, so check the "real stack
// limit".
__ CompareRoot(sp, RootIndex::kRealStackLimit);
__ bgt(&done); // Signed comparison.
// Restore the stack pointer.
__ mr(sp, r9);
{
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
}
__ bind(&done);
}
// Relocate arguments down the stack.
// -- r3 : the number of arguments (not including the receiver)
// -- r9 : the previous stack pointer
// -- r10: the size of the [[BoundArguments]]
{
Label skip, loop;
__ li(r8, Operand::Zero());
__ cmpi(r3, Operand::Zero());
__ beq(&skip);
__ mtctr(r3);
__ bind(&loop);
__ LoadPX(r0, MemOperand(r9, r8));
__ StorePX(r0, MemOperand(sp, r8));
__ addi(r8, r8, Operand(kPointerSize));
__ bdnz(&loop);
__ bind(&skip);
}
// Copy [[BoundArguments]] to the stack (below the arguments).
{
Label loop;
__ addi(r5, r5, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ add(r5, r5, r10);
__ mtctr(r7);
__ bind(&loop);
__ LoadPU(r0, MemOperand(r5, -kPointerSize));
__ StorePX(r0, MemOperand(sp, r8));
__ addi(r8, r8, Operand(kPointerSize));
__ bdnz(&loop);
__ add(r3, r3, r7);
}
}
__ bind(&no_bound_arguments);
}
} // namespace
// static
void Builtins::Generate_CallBoundFunctionImpl(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the function to call (checked to be a JSBoundFunction)
// -----------------------------------
__ AssertBoundFunction(r4);
// Patch the receiver to [[BoundThis]].
__ LoadP(ip, FieldMemOperand(r4, JSBoundFunction::kBoundThisOffset));
__ ShiftLeftImm(r0, r3, Operand(kPointerSizeLog2));
__ StorePX(ip, MemOperand(sp, r0));
// Push the [[BoundArguments]] onto the stack.
Generate_PushBoundArguments(masm);
// Call the [[BoundTargetFunction]] via the Call builtin.
__ LoadP(r4,
FieldMemOperand(r4, JSBoundFunction::kBoundTargetFunctionOffset));
__ Jump(BUILTIN_CODE(masm->isolate(), Call_ReceiverIsAny),
RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the target to call (can be any Object).
// -----------------------------------
Label non_callable, non_function, non_smi;
__ JumpIfSmi(r4, &non_callable);
__ bind(&non_smi);
__ CompareObjectType(r4, r7, r8, JS_FUNCTION_TYPE);
__ Jump(masm->isolate()->builtins()->CallFunction(mode),
RelocInfo::CODE_TARGET, eq);
__ cmpi(r8, Operand(JS_BOUND_FUNCTION_TYPE));
__ Jump(BUILTIN_CODE(masm->isolate(), CallBoundFunction),
RelocInfo::CODE_TARGET, eq);
// Check if target has a [[Call]] internal method.
__ lbz(r7, FieldMemOperand(r7, Map::kBitFieldOffset));
__ TestBit(r7, Map::IsCallableBit::kShift, r0);
__ beq(&non_callable, cr0);
// Check if target is a proxy and call CallProxy external builtin
__ cmpi(r8, Operand(JS_PROXY_TYPE));
__ bne(&non_function);
__ Jump(BUILTIN_CODE(masm->isolate(), CallProxy), RelocInfo::CODE_TARGET);
// 2. Call to something else, which might have a [[Call]] internal method (if
// not we raise an exception).
__ bind(&non_function);
// Overwrite the original receiver the (original) target.
__ ShiftLeftImm(r8, r3, Operand(kPointerSizeLog2));
__ StorePX(r4, MemOperand(sp, r8));
// Let the "call_as_function_delegate" take care of the rest.
__ LoadNativeContextSlot(Context::CALL_AS_FUNCTION_DELEGATE_INDEX, r4);
__ Jump(masm->isolate()->builtins()->CallFunction(
ConvertReceiverMode::kNotNullOrUndefined),
RelocInfo::CODE_TARGET);
// 3. Call to something that is not callable.
__ bind(&non_callable);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r4);
__ CallRuntime(Runtime::kThrowCalledNonCallable);
}
}
// static
void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the constructor to call (checked to be a JSFunction)
// -- r6 : the new target (checked to be a constructor)
// -----------------------------------
__ AssertConstructor(r4);
__ AssertFunction(r4);
// Calling convention for function specific ConstructStubs require
// r5 to contain either an AllocationSite or undefined.
__ LoadRoot(r5, RootIndex::kUndefinedValue);
Label call_generic_stub;
// Jump to JSBuiltinsConstructStub or JSConstructStubGeneric.
__ LoadP(r7, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ lwz(r7, FieldMemOperand(r7, SharedFunctionInfo::kFlagsOffset));
__ mov(ip, Operand(SharedFunctionInfo::ConstructAsBuiltinBit::kMask));
__ and_(r7, r7, ip, SetRC);
__ beq(&call_generic_stub, cr0);
__ Jump(BUILTIN_CODE(masm->isolate(), JSBuiltinsConstructStub),
RelocInfo::CODE_TARGET);
__ bind(&call_generic_stub);
__ Jump(BUILTIN_CODE(masm->isolate(), JSConstructStubGeneric),
RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_ConstructBoundFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the function to call (checked to be a JSBoundFunction)
// -- r6 : the new target (checked to be a constructor)
// -----------------------------------
__ AssertConstructor(r4);
__ AssertBoundFunction(r4);
// Push the [[BoundArguments]] onto the stack.
Generate_PushBoundArguments(masm);
// Patch new.target to [[BoundTargetFunction]] if new.target equals target.
Label skip;
__ cmp(r4, r6);
__ bne(&skip);
__ LoadP(r6,
FieldMemOperand(r4, JSBoundFunction::kBoundTargetFunctionOffset));
__ bind(&skip);
// Construct the [[BoundTargetFunction]] via the Construct builtin.
__ LoadP(r4,
FieldMemOperand(r4, JSBoundFunction::kBoundTargetFunctionOffset));
__ Jump(BUILTIN_CODE(masm->isolate(), Construct), RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_Construct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : the number of arguments (not including the receiver)
// -- r4 : the constructor to call (can be any Object)
// -- r6 : the new target (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -----------------------------------
// Check if target is a Smi.
Label non_constructor, non_proxy;
__ JumpIfSmi(r4, &non_constructor);
// Check if target has a [[Construct]] internal method.
__ LoadP(r7, FieldMemOperand(r4, HeapObject::kMapOffset));
__ lbz(r5, FieldMemOperand(r7, Map::kBitFieldOffset));
__ TestBit(r5, Map::IsConstructorBit::kShift, r0);
__ beq(&non_constructor, cr0);
// Dispatch based on instance type.
__ CompareInstanceType(r7, r8, JS_FUNCTION_TYPE);
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructFunction),
RelocInfo::CODE_TARGET, eq);
// Only dispatch to bound functions after checking whether they are
// constructors.
__ cmpi(r8, Operand(JS_BOUND_FUNCTION_TYPE));
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructBoundFunction),
RelocInfo::CODE_TARGET, eq);
// Only dispatch to proxies after checking whether they are constructors.
__ cmpi(r8, Operand(JS_PROXY_TYPE));
__ bne(&non_proxy);
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructProxy),
RelocInfo::CODE_TARGET);
// Called Construct on an exotic Object with a [[Construct]] internal method.
__ bind(&non_proxy);
{
// Overwrite the original receiver with the (original) target.
__ ShiftLeftImm(r8, r3, Operand(kPointerSizeLog2));
__ StorePX(r4, MemOperand(sp, r8));
// Let the "call_as_constructor_delegate" take care of the rest.
__ LoadNativeContextSlot(Context::CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, r4);
__ Jump(masm->isolate()->builtins()->CallFunction(),
RelocInfo::CODE_TARGET);
}
// Called Construct on an Object that doesn't have a [[Construct]] internal
// method.
__ bind(&non_constructor);
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructedNonConstructable),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : actual number of arguments
// -- r4 : function (passed through to callee)
// -- r5 : expected number of arguments
// -- r6 : new target (passed through to callee)
// -----------------------------------
Label dont_adapt_arguments, stack_overflow, skip_adapt_arguments;
__ cmpli(r5, Operand(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
__ beq(&dont_adapt_arguments);
__ LoadP(r7, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ LoadP(r7, FieldMemOperand(r7, SharedFunctionInfo::kFlagsOffset));
__ TestBitMask(r7, SharedFunctionInfo::IsSafeToSkipArgumentsAdaptorBit::kMask,
r0);
__ bne(&skip_adapt_arguments, cr0);
// -------------------------------------------
// Adapt arguments.
// -------------------------------------------
{
Label under_application, over_application, invoke;
__ cmp(r3, r5);
__ blt(&under_application);
// Enough parameters: actual >= expected
__ bind(&over_application);
{
EnterArgumentsAdaptorFrame(masm);
Generate_StackOverflowCheck(masm, r5, r8, &stack_overflow);
// Calculate copy start address into r3 and copy end address into r7.
// r3: actual number of arguments as a smi
// r4: function
// r5: expected number of arguments
// r6: new target (passed through to callee)
__ SmiToPtrArrayOffset(r3, r3);
__ add(r3, r3, fp);
// adjust for return address and receiver
__ addi(r3, r3, Operand(2 * kPointerSize));
__ ShiftLeftImm(r7, r5, Operand(kPointerSizeLog2));
__ sub(r7, r3, r7);
// Copy the arguments (including the receiver) to the new stack frame.
// r3: copy start address
// r4: function
// r5: expected number of arguments
// r6: new target (passed through to callee)
// r7: copy end address
Label copy;
__ bind(&copy);
__ LoadP(r0, MemOperand(r3, 0));
__ push(r0);
__ cmp(r3, r7); // Compare before moving to next argument.
__ subi(r3, r3, Operand(kPointerSize));
__ bne(&copy);
__ b(&invoke);
}
// Too few parameters: Actual < expected
__ bind(&under_application);
{
EnterArgumentsAdaptorFrame(masm);
Generate_StackOverflowCheck(masm, r5, r8, &stack_overflow);
// Calculate copy start address into r0 and copy end address is fp.
// r3: actual number of arguments as a smi
// r4: function
// r5: expected number of arguments
// r6: new target (passed through to callee)
__ SmiToPtrArrayOffset(r3, r3);
__ add(r3, r3, fp);
// Copy the arguments (including the receiver) to the new stack frame.
// r3: copy start address
// r4: function
// r5: expected number of arguments
// r6: new target (passed through to callee)
Label copy;
__ bind(&copy);
// Adjust load for return address and receiver.
__ LoadP(r0, MemOperand(r3, 2 * kPointerSize));
__ push(r0);
__ cmp(r3, fp); // Compare before moving to next argument.
__ subi(r3, r3, Operand(kPointerSize));
__ bne(&copy);
// Fill the remaining expected arguments with undefined.
// r4: function
// r5: expected number of arguments
// r6: new target (passed through to callee)
__ LoadRoot(r0, RootIndex::kUndefinedValue);
__ ShiftLeftImm(r7, r5, Operand(kPointerSizeLog2));
__ sub(r7, fp, r7);
// Adjust for frame.
__ subi(r7, r7,
Operand(ArgumentsAdaptorFrameConstants::kFixedFrameSizeFromFp +
kPointerSize));
Label fill;
__ bind(&fill);
__ push(r0);
__ cmp(sp, r7);
__ bne(&fill);
}
// Call the entry point.
__ bind(&invoke);
__ mr(r3, r5);
// r3 : expected number of arguments
// r4 : function (passed through to callee)
// r6 : new target (passed through to callee)
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kCodeOffset));
__ CallCodeObject(r5);
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(
masm->pc_offset());
// Exit frame and return.
LeaveArgumentsAdaptorFrame(masm);
__ blr();
}
// -------------------------------------------
// Skip adapt arguments.
// -------------------------------------------
__ bind(&skip_adapt_arguments);
{
// The callee cannot observe the actual arguments, so it's safe to just
// pass the expected arguments by massaging the stack appropriately. See
// http://bit.ly/v8-faster-calls-with-arguments-mismatch for details.
Label under_application, over_application;
__ cmp(r3, r5);
__ blt(&under_application);
__ bind(&over_application);
{
// Remove superfluous parameters from the stack.
__ sub(r7, r3, r5);
__ mr(r3, r5);
__ ShiftLeftImm(r7, r7, Operand(kPointerSizeLog2));
__ add(sp, sp, r7);
__ b(&dont_adapt_arguments);
}
__ bind(&under_application);
{
// Fill remaining expected arguments with undefined values.
Label fill;
__ LoadRoot(r7, RootIndex::kUndefinedValue);
__ bind(&fill);
__ addi(r3, r3, Operand(1));
__ push(r7);
__ cmp(r3, r5);
__ blt(&fill);
__ b(&dont_adapt_arguments);
}
}
// -------------------------------------------
// Dont adapt arguments.
// -------------------------------------------
__ bind(&dont_adapt_arguments);
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadP(r5, FieldMemOperand(r4, JSFunction::kCodeOffset));
__ JumpCodeObject(r5);
__ bind(&stack_overflow);
{
FrameScope frame(masm, StackFrame::MANUAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bkpt(0);
}
}
void Builtins::Generate_WasmCompileLazy(MacroAssembler* masm) {
// The function index was put in a register by the jump table trampoline.
// Convert to Smi for the runtime call.
__ SmiTag(kWasmCompileLazyFuncIndexRegister,
kWasmCompileLazyFuncIndexRegister);
{
HardAbortScope hard_abort(masm); // Avoid calls to Abort.
FrameAndConstantPoolScope scope(masm, StackFrame::WASM_COMPILE_LAZY);
// Save all parameter registers (see wasm-linkage.cc). They might be
// overwritten in the runtime call below. We don't have any callee-saved
// registers in wasm, so no need to store anything else.
constexpr RegList gp_regs =
Register::ListOf<r3, r4, r5, r6, r7, r8, r9, r10>();
constexpr RegList fp_regs =
DoubleRegister::ListOf<d1, d2, d3, d4, d5, d6, d7, d8>();
__ MultiPush(gp_regs);
__ MultiPushDoubles(fp_regs);
// Pass instance and function index as explicit arguments to the runtime
// function.
__ Push(kWasmInstanceRegister, kWasmCompileLazyFuncIndexRegister);
// Load the correct CEntry builtin from the instance object.
__ LoadP(r5, FieldMemOperand(kWasmInstanceRegister,
WasmInstanceObject::kCEntryStubOffset));
// Initialize the JavaScript context with 0. CEntry will use it to
// set the current context on the isolate.
__ LoadSmiLiteral(cp, Smi::zero());
__ CallRuntimeWithCEntry(Runtime::kWasmCompileLazy, r5);
// The entrypoint address is the return value.
__ mr(r11, kReturnRegister0);
// Restore registers.
__ MultiPopDoubles(fp_regs);
__ MultiPop(gp_regs);
}
// Finally, jump to the entrypoint.
__ Jump(r11);
}
void Builtins::Generate_CEntry(MacroAssembler* masm, int result_size,
SaveFPRegsMode save_doubles, ArgvMode argv_mode,
bool builtin_exit_frame) {
// Called from JavaScript; parameters are on stack as if calling JS function.
// r3: number of arguments including receiver
// r4: 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)
//
// If argv_mode == kArgvInRegister:
// r5: pointer to the first argument
__ mr(r15, r4);
if (argv_mode == kArgvInRegister) {
// Move argv into the correct register.
__ mr(r4, r5);
} else {
// Compute the argv pointer.
__ ShiftLeftImm(r4, r3, Operand(kPointerSizeLog2));
__ add(r4, r4, sp);
__ subi(r4, r4, Operand(kPointerSize));
}
// Enter the exit frame that transitions from JavaScript to C++.
FrameScope scope(masm, StackFrame::MANUAL);
// Need at least one extra slot for return address location.
int arg_stack_space = 1;
// Pass buffer for return value on stack if necessary
bool needs_return_buffer =
(result_size == 2 && !ABI_RETURNS_OBJECT_PAIRS_IN_REGS);
if (needs_return_buffer) {
arg_stack_space += result_size;
}
__ EnterExitFrame(
save_doubles, arg_stack_space,
builtin_exit_frame ? StackFrame::BUILTIN_EXIT : StackFrame::EXIT);
// Store a copy of argc in callee-saved registers for later.
__ mr(r14, r3);
// r3, r14: number of arguments including receiver (C callee-saved)
// r4: pointer to the first argument
// r15: pointer to builtin function (C callee-saved)
// Result returned in registers or stack, depending on result size and ABI.
Register isolate_reg = r5;
if (needs_return_buffer) {
// The return value is a non-scalar value.
// Use frame storage reserved by calling function to pass return
// buffer as implicit first argument.
__ mr(r5, r4);
__ mr(r4, r3);
__ addi(r3, sp, Operand((kStackFrameExtraParamSlot + 1) * kPointerSize));
isolate_reg = r6;
}
// Call C built-in.
__ Move(isolate_reg, ExternalReference::isolate_address(masm->isolate()));
Register target = r15;
__ StoreReturnAddressAndCall(target);
// If return value is on the stack, pop it to registers.
if (needs_return_buffer) {
__ LoadP(r4, MemOperand(r3, kPointerSize));
__ LoadP(r3, MemOperand(r3));
}
// Check result for exception sentinel.
Label exception_returned;
__ CompareRoot(r3, RootIndex::kException);
__ beq(&exception_returned);
// Check that there is no pending exception, otherwise we
// should have returned the exception sentinel.
if (FLAG_debug_code) {
Label okay;
ExternalReference pending_exception_address = ExternalReference::Create(
IsolateAddressId::kPendingExceptionAddress, masm->isolate());
__ Move(r6, pending_exception_address);
__ LoadP(r6, MemOperand(r6));
__ CompareRoot(r6, RootIndex::kTheHoleValue);
// Cannot use check here as it attempts to generate call into runtime.
__ beq(&okay);
__ stop("Unexpected pending exception");
__ bind(&okay);
}
// Exit C frame and return.
// r3:r4: result
// sp: stack pointer
// fp: frame pointer
Register argc = argv_mode == kArgvInRegister
// We don't want to pop arguments so set argc to no_reg.
? no_reg
// r14: still holds argc (callee-saved).
: r14;
__ LeaveExitFrame(save_doubles, argc);
__ blr();
// Handling of exception.
__ bind(&exception_returned);
ExternalReference pending_handler_context_address = ExternalReference::Create(
IsolateAddressId::kPendingHandlerContextAddress, masm->isolate());
ExternalReference pending_handler_entrypoint_address =
ExternalReference::Create(
IsolateAddressId::kPendingHandlerEntrypointAddress, masm->isolate());
ExternalReference pending_handler_constant_pool_address =
ExternalReference::Create(
IsolateAddressId::kPendingHandlerConstantPoolAddress,
masm->isolate());
ExternalReference pending_handler_fp_address = ExternalReference::Create(
IsolateAddressId::kPendingHandlerFPAddress, masm->isolate());
ExternalReference pending_handler_sp_address = ExternalReference::Create(
IsolateAddressId::kPendingHandlerSPAddress, masm->isolate());
// Ask the runtime for help to determine the handler. This will set r3 to
// contain the current pending exception, don't clobber it.
ExternalReference find_handler =
ExternalReference::Create(Runtime::kUnwindAndFindExceptionHandler);
{
FrameScope scope(masm, StackFrame::MANUAL);
__ PrepareCallCFunction(3, 0, r3);
__ li(r3, Operand::Zero());
__ li(r4, Operand::Zero());
__ Move(r5, ExternalReference::isolate_address(masm->isolate()));
__ CallCFunction(find_handler, 3);
}
// Retrieve the handler context, SP and FP.
__ Move(cp, pending_handler_context_address);
__ LoadP(cp, MemOperand(cp));
__ Move(sp, pending_handler_sp_address);
__ LoadP(sp, MemOperand(sp));
__ Move(fp, pending_handler_fp_address);
__ LoadP(fp, MemOperand(fp));
// If the handler is a JS frame, restore the context to the frame. Note that
// the context will be set to (cp == 0) for non-JS frames.
Label skip;
__ cmpi(cp, Operand::Zero());
__ beq(&skip);
__ StoreP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ bind(&skip);
// Reset the masking register. This is done independent of the underlying
// feature flag {FLAG_untrusted_code_mitigations} to make the snapshot work
// with both configurations. It is safe to always do this, because the
// underlying register is caller-saved and can be arbitrarily clobbered.
__ ResetSpeculationPoisonRegister();
// Compute the handler entry address and jump to it.
ConstantPoolUnavailableScope constant_pool_unavailable(masm);
__ Move(ip, pending_handler_entrypoint_address);
__ LoadP(ip, MemOperand(ip));