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chromium / v8 / v8 / d8a922f9a688f0214a58eede7faf1a7b93bc700d / . / src / builtins / s390 / builtins-s390.cc
blob: 1260e0a301e577ee7f13f5f31e9c1b68b49c350a [file] [log] [blame]
// 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_S390X
#include "src/api/api-arguments.h"
#include "src/builtins/builtins-descriptors.h"
#include "src/builtins/builtins-inl.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/interface-descriptors-inl.h"
// For interpreter_entry_return_pc_offset. TODO(jkummerow): Drop.
#include "src/codegen/macro-assembler-inl.h"
#include "src/codegen/register-configuration.h"
#include "src/debug/debug.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames.h"
#include "src/heap/heap-inl.h"
#include "src/logging/counters.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/runtime/runtime.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/wasm/baseline/liftoff-assembler-defs.h"
#include "src/wasm/object-access.h"
#include "src/wasm/wasm-linkage.h"
#include "src/wasm/wasm-objects.h"
#endif // V8_ENABLE_WEBASSEMBLY
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
namespace {
static void AssertCodeIsBaseline(MacroAssembler* masm, Register code,
Register scratch) {
DCHECK(!AreAliased(code, scratch));
// Verify that the code kind is baseline code via the CodeKind.
__ LoadU32(scratch, FieldMemOperand(code, Code::kFlagsOffset));
__ DecodeField<Code::KindField>(scratch);
__ CmpS64(scratch, Operand(static_cast<int>(CodeKind::BASELINE)));
__ Assert(eq, AbortReason::kExpectedBaselineData);
}
static void GetSharedFunctionInfoBytecodeOrBaseline(
MacroAssembler* masm, Register sfi, Register bytecode, Register scratch1,
Label* is_baseline, Label* is_unavailable) {
USE(GetSharedFunctionInfoBytecodeOrBaseline);
ASM_CODE_COMMENT(masm);
Label done;
Register data = bytecode;
__ LoadTaggedField(
data,
FieldMemOperand(sfi, SharedFunctionInfo::kTrustedFunctionDataOffset));
__ LoadMap(scratch1, data);
__ LoadU16(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
#ifndef V8_JITLESS
__ CmpS32(scratch1, Operand(CODE_TYPE));
if (v8_flags.debug_code) {
Label not_baseline;
__ b(ne, &not_baseline);
AssertCodeIsBaseline(masm, data, scratch1);
__ beq(is_baseline);
__ bind(&not_baseline);
} else {
__ beq(is_baseline);
}
#endif // !V8_JITLESS
__ CmpS32(scratch1, Operand(BYTECODE_ARRAY_TYPE));
__ b(eq, &done);
__ CmpS32(scratch1, Operand(INTERPRETER_DATA_TYPE));
__ b(ne, is_unavailable);
__ LoadTaggedField(
data, FieldMemOperand(data, InterpreterData::kBytecodeArrayOffset));
__ bind(&done);
}
void Generate_OSREntry(MacroAssembler* masm, Register entry_address,
Operand offset) {
if (!offset.is_reg() && is_int20(offset.immediate())) {
__ lay(r14, MemOperand(entry_address, offset.immediate()));
} else {
DCHECK(offset.is_reg());
__ AddS64(r14, entry_address, offset.rm());
}
// "return" to the OSR entry point of the function.
__ Ret();
}
void ResetSharedFunctionInfoAge(MacroAssembler* masm, Register sfi,
Register scratch) {
DCHECK(!AreAliased(sfi, scratch));
__ mov(scratch, Operand(0));
__ StoreU16(scratch, FieldMemOperand(sfi, SharedFunctionInfo::kAgeOffset),
no_reg);
}
void ResetJSFunctionAge(MacroAssembler* masm, Register js_function,
Register scratch1, Register scratch2) {
__ LoadTaggedField(
scratch1,
FieldMemOperand(js_function, JSFunction::kSharedFunctionInfoOffset));
ResetSharedFunctionInfoAge(masm, scratch1, scratch2);
}
void ResetFeedbackVectorOsrUrgency(MacroAssembler* masm,
Register feedback_vector, Register scratch) {
DCHECK(!AreAliased(feedback_vector, scratch));
__ LoadU8(scratch,
FieldMemOperand(feedback_vector, FeedbackVector::kOsrStateOffset));
__ AndP(scratch, scratch, Operand(~FeedbackVector::OsrUrgencyBits::kMask));
__ StoreU8(scratch,
FieldMemOperand(feedback_vector, FeedbackVector::kOsrStateOffset));
}
} // namespace
// If there is baseline code on the shared function info, converts an
// interpreter frame into a baseline frame and continues execution in baseline
// code. Otherwise execution continues with bytecode.
void Builtins::Generate_InterpreterOnStackReplacement_ToBaseline(
MacroAssembler* masm) {
Label start;
__ bind(&start);
// Get function from the frame.
Register closure = r3;
__ LoadU64(closure, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
// Get the InstructionStream object from the shared function info.
Register code_obj = r8;
__ LoadTaggedField(
code_obj,
FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
ResetSharedFunctionInfoAge(masm, code_obj, r5);
__ LoadTaggedField(
code_obj, FieldMemOperand(
code_obj, SharedFunctionInfo::kTrustedFunctionDataOffset));
// For OSR entry it is safe to assume we always have baseline code.
if (v8_flags.debug_code) {
__ CompareObjectType(code_obj, r5, r5, CODE_TYPE);
__ Assert(eq, AbortReason::kExpectedBaselineData);
AssertCodeIsBaseline(masm, code_obj, r5);
}
// Load the feedback cell and vector.
Register feedback_cell = r4;
Register feedback_vector = r1;
__ LoadTaggedField(feedback_cell,
FieldMemOperand(closure, JSFunction::kFeedbackCellOffset));
__ LoadTaggedField(
feedback_vector,
FieldMemOperand(feedback_cell, FeedbackCell::kValueOffset));
Label install_baseline_code;
// Check if feedback vector is valid. If not, call prepare for baseline to
// allocate it.
__ CompareObjectType(feedback_vector, r5, r5, FEEDBACK_VECTOR_TYPE);
__ b(ne, &install_baseline_code);
// Save BytecodeOffset from the stack frame.
__ LoadU64(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister);
// Replace bytecode offset with feedback cell.
static_assert(InterpreterFrameConstants::kBytecodeOffsetFromFp ==
BaselineFrameConstants::kFeedbackCellFromFp);
__ StoreU64(feedback_cell,
MemOperand(fp, BaselineFrameConstants::kFeedbackCellFromFp));
feedback_cell = no_reg;
// Update feedback vector cache.
static_assert(InterpreterFrameConstants::kFeedbackVectorFromFp ==
BaselineFrameConstants::kFeedbackVectorFromFp);
__ StoreU64(feedback_vector,
MemOperand(fp, InterpreterFrameConstants::kFeedbackVectorFromFp));
feedback_vector = no_reg;
// Compute baseline pc for bytecode offset.
Register get_baseline_pc = r5;
__ Move(get_baseline_pc,
ExternalReference::baseline_pc_for_next_executed_bytecode());
__ SubS64(kInterpreterBytecodeOffsetRegister,
kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
// Get bytecode array from the stack frame.
__ LoadU64(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
// Save the accumulator register, since it's clobbered by the below call.
__ Push(kInterpreterAccumulatorRegister);
{
__ mov(kCArgRegs[0], code_obj);
__ mov(kCArgRegs[1], kInterpreterBytecodeOffsetRegister);
__ mov(kCArgRegs[2], kInterpreterBytecodeArrayRegister);
FrameScope scope(masm, StackFrame::INTERNAL);
__ PrepareCallCFunction(3, 0, r1);
__ CallCFunction(get_baseline_pc, 3, 0);
}
__ LoadCodeInstructionStart(code_obj, code_obj);
__ AddS64(code_obj, code_obj, kReturnRegister0);
__ Pop(kInterpreterAccumulatorRegister);
Generate_OSREntry(masm, code_obj, Operand(0));
__ Trap(); // Unreachable.
__ bind(&install_baseline_code);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(kInterpreterAccumulatorRegister);
__ Push(closure);
__ CallRuntime(Runtime::kInstallBaselineCode, 1);
__ Pop(kInterpreterAccumulatorRegister);
}
// Retry from the start after installing baseline code.
__ b(&start);
}
namespace {
enum class OsrSourceTier {
kInterpreter,
kBaseline,
};
void OnStackReplacement(MacroAssembler* masm, OsrSourceTier source,
Register maybe_target_code,
Register expected_param_count) {
Label jump_to_optimized_code;
{
// If maybe_target_code is not null, no need to call into runtime. A
// precondition here is: if maybe_target_code is an InstructionStream
// object, it must NOT be marked_for_deoptimization (callers must ensure
// this).
__ CmpSmiLiteral(maybe_target_code, Smi::zero(), r0);
__ bne(&jump_to_optimized_code);
}
ASM_CODE_COMMENT(masm);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kCompileOptimizedOSR);
}
// If the code object is null, just return to the caller.
__ CmpSmiLiteral(r2, Smi::zero(), r0);
__ bne(&jump_to_optimized_code);
__ Ret();
__ bind(&jump_to_optimized_code);
DCHECK_EQ(maybe_target_code, r2); // Already in the right spot.
// OSR entry tracing.
{
Label next;
__ Move(r3, ExternalReference::address_of_log_or_trace_osr());
__ LoadU8(r3, MemOperand(r3));
__ tmll(r3, Operand(0xFF)); // Mask to the LSB.
__ beq(&next);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r2); // Preserve the code object.
__ CallRuntime(Runtime::kLogOrTraceOptimizedOSREntry, 0);
__ Pop(r2);
}
__ bind(&next);
}
if (source == OsrSourceTier::kInterpreter) {
// 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);
}
// The sandbox would rely on testing expected_parameter_count here.
static_assert(!V8_ENABLE_SANDBOX_BOOL);
// Load deoptimization data from the code object.
// <deopt_data> = <code>[#deoptimization_data_offset]
__ LoadTaggedField(
r3,
FieldMemOperand(r2, Code::kDeoptimizationDataOrInterpreterDataOffset));
// Load the OSR entrypoint offset from the deoptimization data.
// <osr_offset> = <deopt_data>[#header_size + #osr_pc_offset]
__ SmiUntagField(
r3, FieldMemOperand(r3, FixedArray::OffsetOfElementAt(
DeoptimizationData::kOsrPcOffsetIndex)));
__ LoadCodeInstructionStart(r2, r2);
// Compute the target address = code_entry + osr_offset
// <entry_addr> = <code_entry> + <osr_offset>
Generate_OSREntry(masm, r2, Operand(r3));
}
} // namespace
void Builtins::Generate_Adaptor(MacroAssembler* masm,
int formal_parameter_count, Address address) {
__ Move(kJavaScriptCallExtraArg1Register, ExternalReference::Create(address));
__ TailCallBuiltin(
Builtins::AdaptorWithBuiltinExitFrame(formal_parameter_count));
}
namespace {
enum class ArgumentsElementType {
kRaw, // Push arguments as they are.
kHandle // Dereference arguments before pushing.
};
void Generate_PushArguments(MacroAssembler* masm, Register array, Register argc,
Register scratch,
ArgumentsElementType element_type) {
DCHECK(!AreAliased(array, argc, scratch));
Register counter = scratch;
Register value = ip;
Label loop, entry;
__ SubS64(counter, argc, Operand(kJSArgcReceiverSlots));
__ b(&entry);
__ bind(&loop);
__ ShiftLeftU64(value, counter, Operand(kSystemPointerSizeLog2));
__ LoadU64(value, MemOperand(array, value));
if (element_type == ArgumentsElementType::kHandle) {
__ LoadU64(value, MemOperand(value));
}
__ push(value);
__ bind(&entry);
__ SubS64(counter, counter, Operand(1));
__ bge(&loop);
}
void Generate_JSBuiltinsConstructStubHelper(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : number of arguments
// -- r3 : constructor function
// -- r5 : new target
// -- cp : context
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Register scratch = r4;
Label stack_overflow;
__ StackOverflowCheck(r2, scratch, &stack_overflow);
// Enter a construct frame.
{
FrameAndConstantPoolScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ Push(cp, r2);
// TODO(victorgomes): When the arguments adaptor is completely removed, we
// should get the formal parameter count and copy the arguments in its
// correct position (including any undefined), instead of delaying this to
// InvokeFunction.
// Set up pointer to first argument (skip receiver).
__ la(r6, MemOperand(fp, StandardFrameConstants::kCallerSPOffset +
kSystemPointerSize));
// Copy arguments and receiver to the expression stack.
// r6: Pointer to start of arguments.
// r2: Number of arguments.
Generate_PushArguments(masm, r6, r2, r1, ArgumentsElementType::kRaw);
// The receiver for the builtin/api call.
__ PushRoot(RootIndex::kTheHoleValue);
// Call the function.
// r2: number of arguments
// r3: constructor function
// r5: new target
__ InvokeFunctionWithNewTarget(r3, r5, r2, InvokeType::kCall);
// Restore context from the frame.
__ LoadU64(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
// Restore arguments count from the frame.
__ LoadU64(scratch, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
__ DropArguments(scratch);
__ Ret();
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bkpt(0); // Unreachable code.
}
}
} // namespace
// The construct stub for ES5 constructor functions and ES6 class constructors.
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2: number of arguments (untagged)
// -- r3: constructor function
// -- r5: new target
// -- cp: context
// -- lr: return address
// -- sp[...]: constructor arguments
// -----------------------------------
FrameScope scope(masm, StackFrame::MANUAL);
// Enter a construct frame.
Label post_instantiation_deopt_entry, not_create_implicit_receiver;
__ EnterFrame(StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ Push(cp, r2, r3);
__ PushRoot(RootIndex::kUndefinedValue);
__ Push(r5);
// ----------- S t a t e -------------
// -- sp[0*kSystemPointerSize]: new target
// -- sp[1*kSystemPointerSize]: padding
// -- r3 and sp[2*kSystemPointerSize]: constructor function
// -- sp[3*kSystemPointerSize]: number of arguments
// -- sp[4*kSystemPointerSize]: context
// -----------------------------------
__ LoadTaggedField(
r6, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ LoadU32(r6, FieldMemOperand(r6, SharedFunctionInfo::kFlagsOffset));
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(r6);
__ JumpIfIsInRange(
r6, r6, static_cast<uint8_t>(FunctionKind::kDefaultDerivedConstructor),
static_cast<uint8_t>(FunctionKind::kDerivedConstructor),
&not_create_implicit_receiver);
// If not derived class constructor: Allocate the new receiver object.
__ CallBuiltin(Builtin::kFastNewObject);
__ b(&post_instantiation_deopt_entry);
// Else: use TheHoleValue as receiver for constructor call
__ bind(&not_create_implicit_receiver);
__ LoadRoot(r2, RootIndex::kTheHoleValue);
// ----------- S t a t e -------------
// -- r2: receiver
// -- Slot 4 / sp[0*kSystemPointerSize]: new target
// -- Slot 3 / sp[1*kSystemPointerSize]: padding
// -- Slot 2 / sp[2*kSystemPointerSize]: constructor function
// -- Slot 1 / sp[3*kSystemPointerSize]: number of arguments
// -- Slot 0 / sp[4*kSystemPointerSize]: context
// -----------------------------------
// Deoptimizer enters here.
masm->isolate()->heap()->SetConstructStubCreateDeoptPCOffset(
masm->pc_offset());
__ bind(&post_instantiation_deopt_entry);
// Restore new target.
__ Pop(r5);
// Push the allocated receiver to the stack.
__ Push(r2);
// 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. The second copy is pushed after the arguments, we saved in r6
// since r0 needs to store the number of arguments before
// InvokingFunction.
__ mov(r8, r2);
// Set up pointer to first argument (skip receiver).
__ la(r6, MemOperand(fp, StandardFrameConstants::kCallerSPOffset +
kSystemPointerSize));
// ----------- S t a t e -------------
// -- r5: new target
// -- sp[0*kSystemPointerSize]: implicit receiver
// -- sp[1*kSystemPointerSize]: implicit receiver
// -- sp[2*kSystemPointerSize]: padding
// -- sp[3*kSystemPointerSize]: constructor function
// -- sp[4*kSystemPointerSize]: number of arguments
// -- sp[5*kSystemPointerSize]: context
// -----------------------------------
// Restore constructor function and argument count.
__ LoadU64(r3, MemOperand(fp, ConstructFrameConstants::kConstructorOffset));
__ LoadU64(r2, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
Label stack_overflow;
__ StackOverflowCheck(r2, r7, &stack_overflow);
// Copy arguments and receiver to the expression stack.
// r6: Pointer to start of argument.
// r2: Number of arguments.
Generate_PushArguments(masm, r6, r2, r1, ArgumentsElementType::kRaw);
// Push implicit receiver.
__ Push(r8);
// Call the function.
__ InvokeFunctionWithNewTarget(r3, r5, r2, InvokeType::kCall);
// 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_and_return, check_receiver;
// If the result is undefined, we jump out to using the implicit receiver.
__ JumpIfNotRoot(r2, RootIndex::kUndefinedValue, &check_receiver);
// Otherwise we do a smi check and fall through to check if the return value
// is a valid receiver.
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ LoadU64(r2, MemOperand(sp));
__ JumpIfRoot(r2, RootIndex::kTheHoleValue, &do_throw);
__ bind(&leave_and_return);
// Restore arguments count from the frame.
__ LoadU64(r3, MemOperand(fp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
__ LeaveFrame(StackFrame::CONSTRUCT);
// Remove caller arguments from the stack and return.
__ DropArguments(r3);
__ Ret();
__ bind(&check_receiver);
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(r2, &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(r2, r6, r6, FIRST_JS_RECEIVER_TYPE);
__ bge(&leave_and_return);
__ b(&use_receiver);
__ bind(&do_throw);
// Restore the context from the frame.
__ LoadU64(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
__ bkpt(0);
__ bind(&stack_overflow);
// Restore the context from the frame.
__ LoadU64(cp, MemOperand(fp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowStackOverflow);
// Unreachable code.
__ bkpt(0);
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSBuiltinsConstructStubHelper(masm);
}
// static
void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : the value to pass to the generator
// -- r3 : the JSGeneratorObject to resume
// -- lr : return address
// -----------------------------------
// Store input value into generator object.
__ StoreTaggedField(
r2, FieldMemOperand(r3, JSGeneratorObject::kInputOrDebugPosOffset), r0);
__ RecordWriteField(r3, JSGeneratorObject::kInputOrDebugPosOffset, r2, r5,
kLRHasNotBeenSaved, SaveFPRegsMode::kIgnore);
// Check that r3 is still valid, RecordWrite might have clobbered it.
__ AssertGeneratorObject(r3);
// Load suspended function and context.
__ LoadTaggedField(r6,
FieldMemOperand(r3, JSGeneratorObject::kFunctionOffset));
__ LoadTaggedField(cp, FieldMemOperand(r6, JSFunction::kContextOffset));
// Flood function if we are stepping.
Label prepare_step_in_if_stepping, prepare_step_in_suspended_generator;
Label stepping_prepared;
Register scratch = r7;
ExternalReference debug_hook =
ExternalReference::debug_hook_on_function_call_address(masm->isolate());
__ Move(scratch, debug_hook);
__ LoadS8(scratch, MemOperand(scratch));
__ CmpSmiLiteral(scratch, 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(scratch, debug_suspended_generator);
__ LoadU64(scratch, MemOperand(scratch));
__ CmpS64(scratch, r3);
__ 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;
__ LoadU64(scratch,
__ StackLimitAsMemOperand(StackLimitKind::kRealStackLimit));
__ CmpU64(sp, scratch);
__ blt(&stack_overflow);
// ----------- S t a t e -------------
// -- r3 : the JSGeneratorObject to resume
// -- r6 : generator function
// -- cp : generator context
// -- lr : return address
// -----------------------------------
// Copy the function arguments from the generator object's register file.
__ LoadTaggedField(
r5, FieldMemOperand(r6, JSFunction::kSharedFunctionInfoOffset));
__ LoadU16(
r5, FieldMemOperand(r5, SharedFunctionInfo::kFormalParameterCountOffset));
__ SubS64(r5, r5, Operand(kJSArgcReceiverSlots));
__ LoadTaggedField(
r4,
FieldMemOperand(r3, JSGeneratorObject::kParametersAndRegistersOffset));
{
Label done_loop, loop;
__ bind(&loop);
__ SubS64(r5, r5, Operand(1));
__ blt(&done_loop);
__ ShiftLeftU64(r1, r5, Operand(kTaggedSizeLog2));
__ la(scratch, MemOperand(r4, r1));
__ LoadTaggedField(
scratch, FieldMemOperand(scratch, OFFSET_OF_DATA_START(FixedArray)));
__ Push(scratch);
__ b(&loop);
__ bind(&done_loop);
// Push receiver.
__ LoadTaggedField(scratch,
FieldMemOperand(r3, JSGeneratorObject::kReceiverOffset));
__ Push(scratch);
}
// Underlying function needs to have bytecode available.
if (v8_flags.debug_code) {
Label is_baseline, is_unavailable, ok;
__ LoadTaggedField(
r5, FieldMemOperand(r6, JSFunction::kSharedFunctionInfoOffset));
GetSharedFunctionInfoBytecodeOrBaseline(masm, r5, r5, ip, &is_baseline,
&is_unavailable);
__ jmp(&ok);
__ bind(&is_unavailable);
__ Abort(AbortReason::kMissingBytecodeArray);
__ bind(&is_baseline);
__ CompareObjectType(r5, r5, r5, CODE_TYPE);
__ Assert(eq, AbortReason::kMissingBytecodeArray);
__ bind(&ok);
}
// Resume (Ignition/TurboFan) generator object.
{
__ LoadTaggedField(
r2, FieldMemOperand(r6, JSFunction::kSharedFunctionInfoOffset));
__ LoadS16(r2, FieldMemOperand(
r2, SharedFunctionInfo::kFormalParameterCountOffset));
// 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.
__ mov(r5, r3);
__ mov(r3, r6);
__ JumpJSFunction(r3);
}
__ bind(&prepare_step_in_if_stepping);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r3, r6);
// Push hole as receiver since we do not use it for stepping.
__ PushRoot(RootIndex::kTheHoleValue);
__ CallRuntime(Runtime::kDebugOnFunctionCall);
__ Pop(r3);
__ LoadTaggedField(r6,
FieldMemOperand(r3, JSGeneratorObject::kFunctionOffset));
}
__ b(&stepping_prepared);
__ bind(&prepare_step_in_suspended_generator);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r3);
__ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
__ Pop(r3);
__ LoadTaggedField(r6,
FieldMemOperand(r3, 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(r3);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable);
__ Trap(); // Unreachable.
}
namespace {
constexpr int kPushedStackSpace =
(kNumCalleeSaved + 2) * kSystemPointerSize +
kNumCalleeSavedDoubles * kDoubleSize + 7 * kSystemPointerSize +
EntryFrameConstants::kNextFastCallFramePCOffset - kSystemPointerSize;
// 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,
Builtin entry_trampoline) {
// The register state is either:
// r2: root register value
// r3: code entry
// r4: function
// r5: receiver
// r6: argc
// [sp + 20 * kSystemPointerSize]: argv
// or
// r2: root_register_value
// r3: microtask_queue
Label invoke, handler_entry, exit;
#if V8_OS_ZOS
const int stack_space = 12 * kSystemPointerSize;
// Store r4 - r15 to Stack
__ StoreMultipleP(r4, sp, MemOperand(r4, kStackPointerBias - stack_space));
// Grow stack
__ lay(r4, MemOperand(r4, -stack_space));
// Shuffle input XPLINK register arguments to match LoZ
__ mov(sp, r4);
__ mov(r4, r3);
__ mov(r3, r2);
__ mov(r2, r1);
// Load args 4 and 5 from XPLINK extra frame slots in r5 and r6
__ LoadMultipleP(
r5, r6,
MemOperand(sp, kStackPointerBias +
kXPLINKStackFrameExtraParamSlot * kSystemPointerSize +
stack_space));
// Load arg 6 from XPLINK extra arg slot
__ LoadU64(r0, MemOperand(sp, kStackPointerBias +
kXPLINKStackFrameExtraParamSlot *
kSystemPointerSize +
stack_space + 2 * kSystemPointerSize));
// Store arg 6 to expected LoZ save area
__ StoreU64(r0, MemOperand(sp, kCalleeRegisterSaveAreaSize));
#endif
int pushed_stack_space = 0;
{
NoRootArrayScope no_root_array(masm);
// saving floating point registers
// 64bit ABI requires f8 to f15 be saved
// http://refspecs.linuxbase.org/ELF/zSeries/lzsabi0_zSeries.html
__ lay(sp, MemOperand(sp, -8 * kDoubleSize));
__ std(d8, MemOperand(sp));
__ std(d9, MemOperand(sp, 1 * kDoubleSize));
__ std(d10, MemOperand(sp, 2 * kDoubleSize));
__ std(d11, MemOperand(sp, 3 * kDoubleSize));
__ std(d12, MemOperand(sp, 4 * kDoubleSize));
__ std(d13, MemOperand(sp, 5 * kDoubleSize));
__ std(d14, MemOperand(sp, 6 * kDoubleSize));
__ std(d15, MemOperand(sp, 7 * kDoubleSize));
pushed_stack_space += kNumCalleeSavedDoubles * kDoubleSize;
// zLinux ABI
// Incoming parameters:
// r2: root register value
// r3: code entry
// r4: function
// r5: receiver
// r6: argc
// [sp + 20 * kSystemPointerSize]: argv
// Requires us to save the callee-preserved registers r6-r13
// General convention is to also save r14 (return addr) and
// sp/r15 as well in a single STM/STMG
__ lay(sp, MemOperand(sp, -10 * kSystemPointerSize));
__ StoreMultipleP(r6, sp, MemOperand(sp, 0));
pushed_stack_space += (kNumCalleeSaved + 2) * kSystemPointerSize;
// Initialize the root register.
// C calling convention. The first argument is passed in r2.
__ mov(kRootRegister, r2);
}
// Push a frame with special values setup to mark it as an entry frame.
// Bad FP (-1)
// SMI Marker
// SMI Marker
// kCEntryFPAddress
// Frame type
// Clear c_entry_fp, now we've pushed its previous value to the stack.
// If the c_entry_fp is not already zero and we don't clear it, the
// StackFrameIteratorForProfiler will assume we are executing C++ and miss the
// JS frames on top.
pushed_stack_space += 7 * kSystemPointerSize;
// Push a bad frame pointer to fail if it is used.
__ mov(r0, Operand(-1));
__ push(r0);
__ mov(r0, Operand(StackFrame::TypeToMarker(type)));
__ push(r0);
__ push(r0);
__ mov(r0, Operand::Zero());
__ Move(ip, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ LoadU64(r9, MemOperand(ip));
__ StoreU64(r0, MemOperand(ip));
__ push(r9);
__ LoadIsolateField(ip, IsolateFieldId::kFastCCallCallerFP);
__ LoadU64(r9, MemOperand(ip));
__ StoreU64(r0, MemOperand(ip));
__ push(r9);
__ LoadIsolateField(ip, IsolateFieldId::kFastCCallCallerPC);
__ LoadU64(r9, MemOperand(ip));
__ StoreU64(r0, MemOperand(ip));
__ push(r9);
#ifdef V8_COMPRESS_POINTERS_IN_SHARED_CAGE
// Initialize the pointer cage base register.
__ LoadRootRelative(kPtrComprCageBaseRegister,
IsolateData::cage_base_offset());
#endif
Register scrach = r8;
// Set up frame pointer for the frame to be pushed.
__ lay(fp, MemOperand(sp, -EntryFrameConstants::kNextFastCallFramePCOffset));
pushed_stack_space +=
EntryFrameConstants::kNextFastCallFramePCOffset - kSystemPointerSize;
// 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(r7, js_entry_sp);
__ LoadAndTestP(scrach, MemOperand(r7));
__ bne(&non_outermost_js, Label::kNear);
__ StoreU64(fp, MemOperand(r7));
__ mov(scrach, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
Label cont;
__ b(&cont, Label::kNear);
__ bind(&non_outermost_js);
__ mov(scrach, Operand(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
__ push(scrach); // frame-type
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the exception.
__ b(&invoke, Label::kNear);
__ 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 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(scrach, ExternalReference::Create(IsolateAddressId::kExceptionAddress,
masm->isolate()));
__ StoreU64(r2, MemOperand(scrach));
__ LoadRoot(r2, RootIndex::kException);
__ b(&exit, Label::kNear);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
// Must preserve r2-r6.
__ 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.
USE(pushed_stack_space);
DCHECK_EQ(kPushedStackSpace, pushed_stack_space);
__ CallBuiltin(entry_trampoline);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit); // r2 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(r7);
__ CmpS64(r7, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ bne(&non_outermost_js_2, Label::kNear);
__ mov(scrach, Operand::Zero());
__ Move(r7, js_entry_sp);
__ StoreU64(scrach, MemOperand(r7));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(r5);
__ LoadIsolateField(scrach, IsolateFieldId::kFastCCallCallerPC);
__ StoreU64(r5, MemOperand(scrach));
__ pop(r5);
__ LoadIsolateField(scrach, IsolateFieldId::kFastCCallCallerFP);
__ StoreU64(r5, MemOperand(scrach));
__ pop(r5);
__ Move(scrach, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
masm->isolate()));
__ StoreU64(r5, MemOperand(scrach));
// Reset the stack to the callee saved registers.
__ lay(sp, MemOperand(sp, -EntryFrameConstants::kNextExitFrameFPOffset));
// Reload callee-saved preserved regs, return address reg (r14) and sp
__ LoadMultipleP(r6, sp, MemOperand(sp, 0));
__ la(sp, MemOperand(sp, 10 * kSystemPointerSize));
// 64bit ABI requires f8 to f15 be saved
__ ld(d8, MemOperand(sp));
__ ld(d9, MemOperand(sp, 1 * kDoubleSize));
__ ld(d10, MemOperand(sp, 2 * kDoubleSize));
__ ld(d11, MemOperand(sp, 3 * kDoubleSize));
__ ld(d12, MemOperand(sp, 4 * kDoubleSize));
__ ld(d13, MemOperand(sp, 5 * kDoubleSize));
__ ld(d14, MemOperand(sp, 6 * kDoubleSize));
__ ld(d15, MemOperand(sp, 7 * kDoubleSize));
__ la(sp, MemOperand(sp, 8 * kDoubleSize));
#if V8_OS_ZOS
// On z/OS, the return register is r3
__ mov(r3, r2);
// Restore r4 - r15 from Stack
__ LoadMultipleP(r4, sp, MemOperand(sp, kStackPointerBias));
__ b(r7);
#else
__ b(r14);
#endif
}
} // namespace
void Builtins::Generate_JSEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY, Builtin::kJSEntryTrampoline);
}
void Builtins::Generate_JSConstructEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::CONSTRUCT_ENTRY,
Builtin::kJSConstructEntryTrampoline);
}
void Builtins::Generate_JSRunMicrotasksEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtin::kRunMicrotasksTrampoline);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// Called from Generate_JS_Entry
// r3: new.target
// r4: function
// r5: receiver
// r6: argc
// [fp + kPushedStackSpace + 20 * kSystemPointerSize]: argv
// r0,r2,r7-r8, cp may be clobbered
__ mov(r2, r6);
// Load argv from the stack.
__ LoadU64(
r6, MemOperand(fp, kPushedStackSpace + EntryFrameConstants::kArgvOffset));
// r2: argc
// r3: new.target
// r4: function
// r5: receiver
// r6: argv
// Enter an internal frame.
{
// FrameScope ends up calling MacroAssembler::EnterFrame here
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);
__ LoadU64(cp, MemOperand(cp));
// Push the function
__ Push(r4);
// Check if we have enough stack space to push all arguments.
Label enough_stack_space, stack_overflow;
__ mov(r7, r2);
__ StackOverflowCheck(r7, r1, &stack_overflow);
__ b(&enough_stack_space);
__ bind(&stack_overflow);
__ CallRuntime(Runtime::kThrowStackOverflow);
// Unreachable code.
__ bkpt(0);
__ bind(&enough_stack_space);
// Copy arguments to the stack from argv to sp.
// The arguments are actually placed in reverse order on sp
// compared to argv (i.e. arg1 is highest memory in sp).
// r2: argc
// r3: function
// r5: new.target
// r6: argv, i.e. points to first arg
// r7: scratch reg to hold scaled argc
// r8: scratch reg to hold arg handle
Generate_PushArguments(masm, r6, r2, r1, ArgumentsElementType::kHandle);
// Push the receiver.
__ Push(r5);
// Setup new.target, argc and function.
__ mov(r5, r3);
__ mov(r3, r4);
// r2: argc
// r3: function
// r5: new.target
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(r4, RootIndex::kUndefinedValue);
__ mov(r6, r4);
__ mov(r7, r6);
__ mov(r8, r6);
// Invoke the code.
Builtin builtin = is_construct ? Builtin::kConstruct : Builtins::Call();
__ CallBuiltin(builtin);
// Exit the JS frame and remove the parameters (except function), and
// return.
}
__ b(r14);
// r2: 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.
// r2: root_register_value
// r3: microtask_queue
__ mov(RunMicrotasksDescriptor::MicrotaskQueueRegister(), r3);
__ TailCallBuiltin(Builtin::kRunMicrotasks);
}
static void LeaveInterpreterFrame(MacroAssembler* masm, Register scratch1,
Register scratch2) {
Register params_size = scratch1;
// Get the size of the formal parameters + receiver (in bytes).
__ LoadU64(params_size,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ LoadU16(params_size,
FieldMemOperand(params_size, BytecodeArray::kParameterSizeOffset));
Register actual_params_size = scratch2;
// Compute the size of the actual parameters + receiver (in bytes).
__ LoadU64(actual_params_size,
MemOperand(fp, StandardFrameConstants::kArgCOffset));
// If actual is bigger than formal, then we should use it to free up the stack
// arguments.
Label corrected_args_count;
__ CmpS64(params_size, actual_params_size);
__ bge(&corrected_args_count);
__ mov(params_size, actual_params_size);
__ bind(&corrected_args_count);
// Leave the frame (also dropping the register file).
__ LeaveFrame(StackFrame::INTERPRETED);
__ DropArguments(params_size);
}
// 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. Will not advance
// the bytecode offset if the current bytecode is a JumpLoop, instead just
// re-executing the JumpLoop to jump to the correct bytecode.
static void AdvanceBytecodeOffsetOrReturn(MacroAssembler* masm,
Register bytecode_array,
Register bytecode_offset,
Register bytecode, Register scratch1,
Register scratch2, Label* if_return) {
Register bytecode_size_table = scratch1;
Register scratch3 = bytecode;
// The bytecode offset value will be increased by one in wide and extra wide
// cases. In the case of having a wide or extra wide JumpLoop bytecode, we
// will restore the original bytecode. In order to simplify the code, we have
// a backup of it.
Register original_bytecode_offset = scratch2;
DCHECK(!AreAliased(bytecode_array, bytecode_offset, bytecode_size_table,
bytecode, original_bytecode_offset));
__ Move(bytecode_size_table,
ExternalReference::bytecode_size_table_address());
__ Move(original_bytecode_offset, bytecode_offset);
// 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));
__ CmpS64(bytecode, Operand(0x3));
__ bgt(&process_bytecode);
__ tmll(bytecode, Operand(0x1));
__ bne(&extra_wide);
// Load the next bytecode and update table to the wide scaled table.
__ AddS64(bytecode_offset, bytecode_offset, Operand(1));
__ LoadU8(bytecode, MemOperand(bytecode_array, bytecode_offset));
__ AddS64(bytecode_size_table, bytecode_size_table,
Operand(kByteSize * interpreter::Bytecodes::kBytecodeCount));
__ b(&process_bytecode);
__ bind(&extra_wide);
// Load the next bytecode and update table to the extra wide scaled table.
__ AddS64(bytecode_offset, bytecode_offset, Operand(1));
__ LoadU8(bytecode, MemOperand(bytecode_array, bytecode_offset));
__ AddS64(bytecode_size_table, bytecode_size_table,
Operand(2 * kByteSize * 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) \
__ CmpS64(bytecode, \
Operand(static_cast<int>(interpreter::Bytecode::k##NAME))); \
__ beq(if_return);
RETURN_BYTECODE_LIST(JUMP_IF_EQUAL)
#undef JUMP_IF_EQUAL
// If this is a JumpLoop, re-execute it to perform the jump to the beginning
// of the loop.
Label end, not_jump_loop;
__ CmpS64(bytecode,
Operand(static_cast<int>(interpreter::Bytecode::kJumpLoop)));
__ bne(&not_jump_loop);
// We need to restore the original bytecode_offset since we might have
// increased it to skip the wide / extra-wide prefix bytecode.
__ Move(bytecode_offset, original_bytecode_offset);
__ b(&end);
__ bind(&not_jump_loop);
// Otherwise, load the size of the current bytecode and advance the offset.
__ LoadU8(scratch3, MemOperand(bytecode_size_table, bytecode));
__ AddS64(bytecode_offset, bytecode_offset, scratch3);
__ bind(&end);
}
// static
void Builtins::Generate_BaselineOutOfLinePrologue(MacroAssembler* masm) {
// UseScratchRegisterScope temps(masm);
// Need a few extra registers
// temps.Include(r8, r9);
auto descriptor =
Builtins::CallInterfaceDescriptorFor(Builtin::kBaselineOutOfLinePrologue);
Register closure = descriptor.GetRegisterParameter(
BaselineOutOfLinePrologueDescriptor::kClosure);
// Load the feedback cell and vector from the closure.
Register feedback_cell = r6;
Register feedback_vector = ip;
__ LoadTaggedField(feedback_cell,
FieldMemOperand(closure, JSFunction::kFeedbackCellOffset));
__ LoadTaggedField(
feedback_vector,
FieldMemOperand(feedback_cell, FeedbackCell::kValueOffset));
__ AssertFeedbackVector(feedback_vector, r1);
#ifndef V8_ENABLE_LEAPTIERING
// Check for an tiering state.
Label flags_need_processing;
Register flags = r8;
{
__ LoadFeedbackVectorFlagsAndJumpIfNeedsProcessing(
flags, feedback_vector, CodeKind::BASELINE, &flags_need_processing);
}
#endif // !V8_ENABLE_LEAPTIERING
{
UseScratchRegisterScope temps(masm);
ResetFeedbackVectorOsrUrgency(masm, feedback_vector, r1);
}
// Increment invocation count for the function.
{
Register invocation_count = r1;
__ LoadU32(invocation_count,
FieldMemOperand(feedback_vector,
FeedbackVector::kInvocationCountOffset));
__ AddU32(invocation_count, Operand(1));
__ StoreU32(invocation_count,
FieldMemOperand(feedback_vector,
FeedbackVector::kInvocationCountOffset));
}
FrameScope frame_scope(masm, StackFrame::MANUAL);
{
ASM_CODE_COMMENT_STRING(masm, "Frame Setup");
// Normally the first thing we'd do here is Push(lr, fp), but we already
// entered the frame in BaselineCompiler::Prologue, as we had to use the
// value lr before the call to this BaselineOutOfLinePrologue builtin.
Register callee_context = descriptor.GetRegisterParameter(
BaselineOutOfLinePrologueDescriptor::kCalleeContext);
Register callee_js_function = descriptor.GetRegisterParameter(
BaselineOutOfLinePrologueDescriptor::kClosure);
ResetJSFunctionAge(masm, callee_js_function, r1, r0);
__ Push(callee_context, callee_js_function);
DCHECK_EQ(callee_js_function, kJavaScriptCallTargetRegister);
DCHECK_EQ(callee_js_function, kJSFunctionRegister);
Register argc = descriptor.GetRegisterParameter(
BaselineOutOfLinePrologueDescriptor::kJavaScriptCallArgCount);
// We'll use the bytecode for both code age/OSR resetting, and pushing onto
// the frame, so load it into a register.
Register bytecodeArray = descriptor.GetRegisterParameter(
BaselineOutOfLinePrologueDescriptor::kInterpreterBytecodeArray);
__ Push(argc, bytecodeArray);
if (v8_flags.debug_code) {
Register scratch = r1;
__ CompareObjectType(feedback_vector, scratch, scratch,
FEEDBACK_VECTOR_TYPE);
__ Assert(eq, AbortReason::kExpectedFeedbackVector);
}
__ Push(feedback_cell);
__ Push(feedback_vector);
}
Label call_stack_guard;
Register frame_size = descriptor.GetRegisterParameter(
BaselineOutOfLinePrologueDescriptor::kStackFrameSize);
{
ASM_CODE_COMMENT_STRING(masm, "Stack/interrupt check");
// Stack check. This folds the checks for both the interrupt stack limit
// check and the real stack limit into one by just checking for the
// interrupt limit. The interrupt limit is either equal to the real stack
// limit or tighter. By ensuring we have space until that limit after
// building the frame we can quickly precheck both at once.
Register sp_minus_frame_size = r1;
Register interrupt_limit = r0;
__ SubS64(sp_minus_frame_size, sp, frame_size);
__ LoadStackLimit(interrupt_limit, StackLimitKind::kInterruptStackLimit);
__ CmpU64(sp_minus_frame_size, interrupt_limit);
__ blt(&call_stack_guard);
}
// Do "fast" return to the caller pc in lr.
__ LoadRoot(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
__ Ret();
#ifndef V8_ENABLE_LEAPTIERING
__ bind(&flags_need_processing);
{
ASM_CODE_COMMENT_STRING(masm, "Optimized marker check");
// Drop the frame created by the baseline call.
__ Pop(r14, fp);
__ OptimizeCodeOrTailCallOptimizedCodeSlot(flags, feedback_vector);
__ Trap();
}
#endif // !V8_ENABLE_LEAPTIERING
__ bind(&call_stack_guard);
{
ASM_CODE_COMMENT_STRING(masm, "Stack/interrupt call");
FrameScope frame_scope(masm, StackFrame::INTERNAL);
// Save incoming new target or generator
__ Push(kJavaScriptCallNewTargetRegister);
__ SmiTag(frame_size);
__ Push(frame_size);
__ CallRuntime(Runtime::kStackGuardWithGap);
__ Pop(kJavaScriptCallNewTargetRegister);
}
__ LoadRoot(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
__ Ret();
}
// static
void Builtins::Generate_BaselineOutOfLinePrologueDeopt(MacroAssembler* masm) {
// We're here because we got deopted during BaselineOutOfLinePrologue's stack
// check. Undo all its frame creation and call into the interpreter instead.
// Drop the feedback vector, the bytecode offset (was the feedback vector but
// got replaced during deopt) and bytecode array.
__ Drop(3);
// Context, closure, argc.
__ Pop(kContextRegister, kJavaScriptCallTargetRegister,
kJavaScriptCallArgCountRegister);
// Drop frame pointer
__ LeaveFrame(StackFrame::BASELINE);
// Enter the interpreter.
__ TailCallBuiltin(Builtin::kInterpreterEntryTrampoline);
}
// 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 live registers are:
// o r2: actual argument count
// o r3: the JS function object being called.
// o r5: 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
// frame-constants.h for its layout.
void Builtins::Generate_InterpreterEntryTrampoline(
MacroAssembler* masm, InterpreterEntryTrampolineMode mode) {
Register closure = r3;
// Get the bytecode array from the function object and load it into
// kInterpreterBytecodeArrayRegister.
__ LoadTaggedField(
r6, FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
ResetSharedFunctionInfoAge(masm, r6, ip);
// The bytecode array could have been flushed from the shared function info,
// if so, call into CompileLazy.
Label is_baseline, compile_lazy;
GetSharedFunctionInfoBytecodeOrBaseline(masm, r6,
kInterpreterBytecodeArrayRegister, ip,
&is_baseline, &compile_lazy);
Label push_stack_frame;
Register feedback_vector = r4;
__ LoadFeedbackVector(feedback_vector, closure, r6, &push_stack_frame);
#ifndef V8_JITLESS
#ifndef V8_ENABLE_LEAPTIERING
// If feedback vector is valid, check for optimized code and update invocation
// count.
Register flags = r6;
Label flags_need_processing;
__ LoadFeedbackVectorFlagsAndJumpIfNeedsProcessing(
flags, feedback_vector, CodeKind::INTERPRETED_FUNCTION,
&flags_need_processing);
#endif // !V8_ENABLE_LEAPTIERING
ResetFeedbackVectorOsrUrgency(masm, feedback_vector, r1);
// Increment invocation count for the function.
__ LoadS32(r1, FieldMemOperand(feedback_vector,
FeedbackVector::kInvocationCountOffset));
__ AddS64(r1, r1, Operand(1));
__ StoreU32(r1, FieldMemOperand(feedback_vector,
FeedbackVector::kInvocationCountOffset));
// 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).
#else
// Note: By omitting the above code in jitless mode we also disable:
// - kFlagsLogNextExecution: only used for logging/profiling; and
// - kInvocationCountOffset: only used for tiering heuristics and code
// coverage.
#endif // !V8_JITLESS
__ bind(&push_stack_frame);
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ PushStandardFrame(closure);
// Load the initial bytecode offset.
__ mov(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
// Push bytecode array and Smi tagged bytecode array offset.
__ SmiTag(r0, kInterpreterBytecodeOffsetRegister);
__ Push(kInterpreterBytecodeArrayRegister, r0, feedback_vector);
// Allocate the local and temporary register file on the stack.
Label stack_overflow;
{
// Load frame size (word) from the BytecodeArray object.
__ LoadU32(r4, FieldMemOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kFrameSizeOffset));
// Do a stack check to ensure we don't go over the limit.
__ SubS64(r8, sp, r4);
__ CmpU64(r8, __ StackLimitAsMemOperand(StackLimitKind::kRealStackLimit));
__ blt(&stack_overflow);
// 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(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
__ ShiftRightU64(r4, r4, Operand(kSystemPointerSizeLog2));
__ LoadAndTestP(r4, r4);
__ beq(&no_args);
__ mov(r1, r4);
__ bind(&loop);
__ push(kInterpreterAccumulatorRegister);
__ SubS64(r1, Operand(1));
__ bne(&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 r5.
Label no_incoming_new_target_or_generator_register;
__ LoadS32(r8,
FieldMemOperand(
kInterpreterBytecodeArrayRegister,
BytecodeArray::kIncomingNewTargetOrGeneratorRegisterOffset));
__ CmpS64(r8, Operand::Zero());
__ beq(&no_incoming_new_target_or_generator_register);
__ ShiftLeftU64(r8, r8, Operand(kSystemPointerSizeLog2));
__ StoreU64(r5, MemOperand(fp, r8));
__ bind(&no_incoming_new_target_or_generator_register);
// Perform interrupt stack check.
// TODO(solanes): Merge with the real stack limit check above.
Label stack_check_interrupt, after_stack_check_interrupt;
__ LoadU64(r0,
__ StackLimitAsMemOperand(StackLimitKind::kInterruptStackLimit));
__ CmpU64(sp, r0);
__ blt(&stack_check_interrupt);
__ bind(&after_stack_check_interrupt);
// The accumulator is already loaded with undefined.
// 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()));
__ LoadU8(r5, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
__ ShiftLeftU64(r5, r5, Operand(kSystemPointerSizeLog2));
__ LoadU64(kJavaScriptCallCodeStartRegister,
MemOperand(kInterpreterDispatchTableRegister, r5));
__ Call(kJavaScriptCallCodeStartRegister);
__ RecordComment("--- InterpreterEntryReturnPC point ---");
if (mode == InterpreterEntryTrampolineMode::kDefault) {
masm->isolate()->heap()->SetInterpreterEntryReturnPCOffset(
masm->pc_offset());
} else {
DCHECK_EQ(mode, InterpreterEntryTrampolineMode::kForProfiling);
// Both versions must be the same up to this point otherwise the builtins
// will not be interchangable.
CHECK_EQ(
masm->isolate()->heap()->interpreter_entry_return_pc_offset().value(),
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.
__ LoadU64(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ LoadU64(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister);
// Either return, or advance to the next bytecode and dispatch.
Label do_return;
__ LoadU8(r3, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
AdvanceBytecodeOffsetOrReturn(masm, kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, r3, r4, r5,
&do_return);
__ b(&do_dispatch);
__ bind(&do_return);
// The return value is in r2.
LeaveInterpreterFrame(masm, r4, r6);
__ Ret();
__ bind(&stack_check_interrupt);
// Modify the bytecode offset in the stack to be kFunctionEntryBytecodeOffset
// for the call to the StackGuard.
__ mov(kInterpreterBytecodeOffsetRegister,
Operand(Smi::FromInt(BytecodeArray::kHeaderSize - kHeapObjectTag +
kFunctionEntryBytecodeOffset)));
__ StoreU64(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ CallRuntime(Runtime::kStackGuard);
// After the call, restore the bytecode array, bytecode offset and accumulator
// registers again. Also, restore the bytecode offset in the stack to its
// previous value.
__ LoadU64(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ mov(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
__ LoadRoot(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
__ SmiTag(r0, kInterpreterBytecodeOffsetRegister);
__ StoreU64(r0,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ jmp(&after_stack_check_interrupt);
#ifndef V8_JITLESS
#ifndef V8_ENABLE_LEAPTIERING
__ bind(&flags_need_processing);
__ OptimizeCodeOrTailCallOptimizedCodeSlot(flags, feedback_vector);
#endif // !V8_ENABLE_LEAPTIERING
__ bind(&is_baseline);
{
#ifndef V8_ENABLE_LEAPTIERING
// Load the feedback vector from the closure.
__ LoadTaggedField(
feedback_vector,
FieldMemOperand(closure, JSFunction::kFeedbackCellOffset));
__ LoadTaggedField(
feedback_vector,
FieldMemOperand(feedback_vector, FeedbackCell::kValueOffset));
Label install_baseline_code;
// Check if feedback vector is valid. If not, call prepare for baseline to
// allocate it.
__ LoadTaggedField(
ip, FieldMemOperand(feedback_vector, HeapObject::kMapOffset));
__ LoadU16(ip, FieldMemOperand(ip, Map::kInstanceTypeOffset));
__ CmpS32(ip, Operand(FEEDBACK_VECTOR_TYPE));
__ b(ne, &install_baseline_code);
// Check for an tiering state.
__ LoadFeedbackVectorFlagsAndJumpIfNeedsProcessing(
flags, feedback_vector, CodeKind::BASELINE, &flags_need_processing);
// Load the baseline code into the closure.
__ mov(r4, kInterpreterBytecodeArrayRegister);
static_assert(kJavaScriptCallCodeStartRegister == r4, "ABI mismatch");
__ ReplaceClosureCodeWithOptimizedCode(r4, closure, ip, r1);
__ JumpCodeObject(r4);
__ bind(&install_baseline_code);
#endif // !V8_ENABLE_LEAPTIERING
__ GenerateTailCallToReturnedCode(Runtime::kInstallBaselineCode);
}
#endif // !V8_JITLESS
__ bind(&compile_lazy);
__ GenerateTailCallToReturnedCode(Runtime::kCompileLazy);
__ bind(&stack_overflow);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bkpt(0); // Should not return.
}
static void GenerateInterpreterPushArgs(MacroAssembler* masm, Register num_args,
Register start_address,
Register scratch) {
ASM_CODE_COMMENT(masm);
__ SubS64(scratch, num_args, Operand(1));
__ ShiftLeftU64(scratch, scratch, Operand(kSystemPointerSizeLog2));
__ SubS64(start_address, start_address, scratch);
// Push the arguments.
__ PushArray(start_address, num_args, r1, scratch,
MacroAssembler::PushArrayOrder::kReverse);
}
// static
void Builtins::Generate_InterpreterPushArgsThenCallImpl(
MacroAssembler* masm, ConvertReceiverMode receiver_mode,
InterpreterPushArgsMode mode) {
DCHECK(mode != InterpreterPushArgsMode::kArrayFunction);
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r4 : 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.
// -- r3 : the target to call (can be any Object).
// -----------------------------------
Label stack_overflow;
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
// The spread argument should not be pushed.
__ SubS64(r2, r2, Operand(1));
}
if (receiver_mode == ConvertReceiverMode::kNullOrUndefined) {
__ SubS64(r5, r2, Operand(kJSArgcReceiverSlots));
} else {
__ mov(r5, r2);
}
__ StackOverflowCheck(r5, ip, &stack_overflow);
// Push the arguments.
GenerateInterpreterPushArgs(masm, r5, r4, r6);
if (receiver_mode == ConvertReceiverMode::kNullOrUndefined) {
__ PushRoot(RootIndex::kUndefinedValue);
}
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
// Pass the spread in the register r2.
// r2 already points to the penultimate argument, the spread
// lies in the next interpreter register.
__ LoadU64(r4, MemOperand(r4, -kSystemPointerSize));
}
// Call the target.
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
__ TailCallBuiltin(Builtin::kCallWithSpread);
} else {
__ TailCallBuiltin(Builtins::Call(receiver_mode));
}
__ bind(&stack_overflow);
{
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// Unreachable Code.
__ bkpt(0);
}
}
// static
void Builtins::Generate_InterpreterPushArgsThenConstructImpl(
MacroAssembler* masm, InterpreterPushArgsMode mode) {
// ----------- S t a t e -------------
// -- r2 : argument count
// -- r5 : new target
// -- r3 : constructor to call
// -- r4 : allocation site feedback if available, undefined otherwise.
// -- r6 : address of the first argument
// -----------------------------------
Label stack_overflow;
__ StackOverflowCheck(r2, ip, &stack_overflow);
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
// The spread argument should not be pushed.
__ SubS64(r2, r2, Operand(1));
}
Register argc_without_receiver = ip;
__ SubS64(argc_without_receiver, r2, Operand(kJSArgcReceiverSlots));
// Push the arguments. r4 and r5 will be modified.
GenerateInterpreterPushArgs(masm, argc_without_receiver, r6, r7);
// Push a slot for the receiver to be constructed.
__ mov(r0, Operand::Zero());
__ push(r0);
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
// Pass the spread in the register r2.
// r4 already points to the penultimate argument, the spread
// lies in the next interpreter register.
__ lay(r6, MemOperand(r6, -kSystemPointerSize));
__ LoadU64(r4, MemOperand(r6));
} else {
__ AssertUndefinedOrAllocationSite(r4, r7);
}
if (mode == InterpreterPushArgsMode::kArrayFunction) {
__ AssertFunction(r3);
// Tail call to the array construct stub (still in the caller
// context at this point).
__ TailCallBuiltin(Builtin::kArrayConstructorImpl);
} else if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
// Call the constructor with r2, r3, and r5 unmodified.
__ TailCallBuiltin(Builtin::kConstructWithSpread);
} else {
DCHECK_EQ(InterpreterPushArgsMode::kOther, mode);
// Call the constructor with r2, r3, and r5 unmodified.
__ TailCallBuiltin(Builtin::kConstruct);
}
__ bind(&stack_overflow);
{
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// Unreachable Code.
__ bkpt(0);
}
}
// static
void Builtins::Generate_ConstructForwardAllArgsImpl(
MacroAssembler* masm, ForwardWhichFrame which_frame) {
// ----------- S t a t e -------------
// -- r5 : new target
// -- r3 : constructor to call
// -----------------------------------
Label stack_overflow;
// Load the frame pointer into r6.
switch (which_frame) {
case ForwardWhichFrame::kCurrentFrame:
__ mov(r6, fp);
break;
case ForwardWhichFrame::kParentFrame:
__ LoadU64(r6, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
break;
}
// Load the argument count into r2.
__ LoadU64(r2, MemOperand(r6, StandardFrameConstants::kArgCOffset));
__ StackOverflowCheck(r2, ip, &stack_overflow);
// Point r6 to the base of the argument list to forward, excluding the
// receiver.
__ AddS64(r6, r6,
Operand((StandardFrameConstants::kFixedSlotCountAboveFp + 1) *
kSystemPointerSize));
// Copy arguments on the stack. r5 is a scratch register.
Register argc_without_receiver = ip;
__ SubS64(argc_without_receiver, r2, Operand(kJSArgcReceiverSlots));
__ PushArray(r6, argc_without_receiver, r1, r7);
// Push a slot for the receiver.
__ mov(r0, Operand::Zero());
__ push(r0);
// Call the constructor with r2, r5, and r3 unmodifdied.
__ TailCallBuiltin(Builtin::kConstruct);
__ bind(&stack_overflow);
{
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// Unreachable Code.
__ bkpt(0);
}
}
namespace {
void NewImplicitReceiver(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : argument count
// -- r3 : constructor to call (checked to be a JSFunction)
// -- r5 : new target
//
// Stack:
// -- Implicit Receiver
// -- [arguments without receiver]
// -- Implicit Receiver
// -- Context
// -- FastConstructMarker
// -- FramePointer
// -----------------------------------
Register implicit_receiver = r6;
// Save live registers.
__ SmiTag(r2);
__ Push(r2, r3, r5);
__ CallBuiltin(Builtin::kFastNewObject);
// Save result.
__ Move(implicit_receiver, r2);
// Restore live registers.
__ Pop(r2, r3, r5);
__ SmiUntag(r2);
// Patch implicit receiver (in arguments)
__ StoreU64(implicit_receiver, MemOperand(sp, 0 * kSystemPointerSize));
// Patch second implicit (in construct frame)
__ StoreU64(
implicit_receiver,
MemOperand(fp, FastConstructFrameConstants::kImplicitReceiverOffset));
// Restore context.
__ LoadU64(cp, MemOperand(fp, FastConstructFrameConstants::kContextOffset));
}
} // namespace
// static
void Builtins::Generate_InterpreterPushArgsThenFastConstructFunction(
MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : argument count
// -- r3 : constructor to call (checked to be a JSFunction)
// -- r5 : new target
// -- r6 : address of the first argument
// -- cp/r13 : context pointer
// -----------------------------------
__ AssertFunction(r3);
// Check if target has a [[Construct]] internal method.
Label non_constructor;
__ LoadMap(r4, r3);
__ LoadU8(r4, FieldMemOperand(r4, Map::kBitFieldOffset));
__ TestBit(r4, Map::Bits1::IsConstructorBit::kShift);
__ beq(&non_constructor);
// Add a stack check before pushing arguments.
Label stack_overflow;
__ StackOverflowCheck(r2, r4, &stack_overflow);
// Enter a construct frame.
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::FAST_CONSTRUCT);
// Implicit receiver stored in the construct frame.
__ LoadRoot(r4, RootIndex::kTheHoleValue);
__ Push(cp, r4);
// Push arguments + implicit receiver.
Register argc_without_receiver = r8;
__ SubS64(argc_without_receiver, r2, Operand(kJSArgcReceiverSlots));
// Push the arguments. r6 and r7 will be modified.
GenerateInterpreterPushArgs(masm, argc_without_receiver, r6, r7);
// Implicit receiver as part of the arguments (patched later if needed).
__ push(r4);
// Check if it is a builtin call.
Label builtin_call;
__ LoadTaggedField(
r4, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ LoadU32(r4, FieldMemOperand(r4, SharedFunctionInfo::kFlagsOffset));
__ AndP(r0, r4, Operand(SharedFunctionInfo::ConstructAsBuiltinBit::kMask));
__ bne(&builtin_call);
// Check if we need to create an implicit receiver.
Label not_create_implicit_receiver;
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(r4);
__ JumpIfIsInRange(
r4, r4, static_cast<uint32_t>(FunctionKind::kDefaultDerivedConstructor),
static_cast<uint32_t>(FunctionKind::kDerivedConstructor),
&not_create_implicit_receiver);
NewImplicitReceiver(masm);
__ bind(&not_create_implicit_receiver);
// Call the function.
__ InvokeFunctionWithNewTarget(r3, r5, r2, InvokeType::kCall);
// ----------- S t a t e -------------
// -- r0 constructor result
//
// Stack:
// -- Implicit Receiver
// -- Context
// -- FastConstructMarker
// -- FramePointer
// -----------------------------------
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetConstructStubInvokeDeoptPCOffset(
masm->pc_offset());
// 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_and_return, check_receiver;
// If the result is undefined, we jump out to using the implicit receiver.
__ JumpIfNotRoot(r2, RootIndex::kUndefinedValue, &check_receiver);
// Otherwise we do a smi check and fall through to check if the return value
// is a valid receiver.
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ LoadU64(
r2, MemOperand(fp, FastConstructFrameConstants::kImplicitReceiverOffset));
__ JumpIfRoot(r2, RootIndex::kTheHoleValue, &do_throw);
__ bind(&leave_and_return);
// Leave construct frame.
__ LeaveFrame(StackFrame::CONSTRUCT);
__ Ret();
__ bind(&check_receiver);
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(r2, &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(r2, r6, r7, FIRST_JS_RECEIVER_TYPE);
__ bge(&leave_and_return);
__ b(&use_receiver);
__ bind(&builtin_call);
// TODO(victorgomes): Check the possibility to turn this into a tailcall.
__ InvokeFunctionWithNewTarget(r3, r5, r2, InvokeType::kCall);
__ LeaveFrame(StackFrame::FAST_CONSTRUCT);
__ Ret();
__ bind(&do_throw);
// Restore the context from the frame.
__ LoadU64(cp, MemOperand(fp, FastConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
__ bkpt(0);
__ bind(&stack_overflow);
// Restore the context from the frame.
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// Unreachable code.
__ bkpt(0);
// Called Construct on an Object that doesn't have a [[Construct]] internal
// method.
__ bind(&non_constructor);
__ TailCallBuiltin(Builtin::kConstructedNonConstructable);
}
static void Generate_InterpreterEnterBytecode(MacroAssembler* masm) {
// Set the return address to the correct point in the interpreter entry
// trampoline.
Label builtin_trampoline, trampoline_loaded;
Tagged<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.
__ LoadU64(r4, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
__ LoadTaggedField(
r4, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
__ LoadTaggedField(
r4, FieldMemOperand(r4, SharedFunctionInfo::kTrustedFunctionDataOffset));
__ CompareObjectType(r4, kInterpreterDispatchTableRegister,
kInterpreterDispatchTableRegister,
INTERPRETER_DATA_TYPE);
__ bne(&builtin_trampoline);
__ LoadTaggedField(
r4, FieldMemOperand(r4, InterpreterData::kInterpreterTrampolineOffset));
__ LoadCodeInstructionStart(r4, r4);
__ b(&trampoline_loaded);
__ bind(&builtin_trampoline);
__ Move(r4, ExternalReference::
address_of_interpreter_entry_trampoline_instruction_start(
masm->isolate()));
__ LoadU64(r4, MemOperand(r4));
__ bind(&trampoline_loaded);
__ AddS64(r14, r4, Operand(interpreter_entry_return_pc_offset.value()));
// Initialize the dispatch table register.
__ Move(
kInterpreterDispatchTableRegister,
ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
// Get the bytecode array pointer from the frame.
__ LoadU64(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
if (v8_flags.debug_code) {
// Check function data field is actually a BytecodeArray object.
__ TestIfSmi(kInterpreterBytecodeArrayRegister);
__ Assert(
ne, AbortReason::kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
__ CompareObjectType(kInterpreterBytecodeArrayRegister, r3, no_reg,
BYTECODE_ARRAY_TYPE);
__ Assert(
eq, AbortReason::kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
}
// Get the target bytecode offset from the frame.
__ LoadU64(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister);
if (v8_flags.debug_code) {
Label okay;
__ CmpS64(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
__ bge(&okay);
__ bkpt(0);
__ bind(&okay);
}
// Dispatch to the target bytecode.
UseScratchRegisterScope temps(masm);
Register scratch = temps.Acquire();
__ LoadU8(scratch, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
__ ShiftLeftU64(scratch, scratch, Operand(kSystemPointerSizeLog2));
__ LoadU64(kJavaScriptCallCodeStartRegister,
MemOperand(kInterpreterDispatchTableRegister, scratch));
__ Jump(kJavaScriptCallCodeStartRegister);
}
void Builtins::Generate_InterpreterEnterAtNextBytecode(MacroAssembler* masm) {
// Get bytecode array and bytecode offset from the stack frame.
__ LoadU64(kInterpreterBytecodeArrayRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ LoadU64(kInterpreterBytecodeOffsetRegister,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister);
Label enter_bytecode, function_entry_bytecode;
__ CmpS64(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag +
kFunctionEntryBytecodeOffset));
__ beq(&function_entry_bytecode);
// Load the current bytecode.
__ LoadU8(r3, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
// Advance to the next bytecode.
Label if_return;
AdvanceBytecodeOffsetOrReturn(masm, kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, r3, r4, r5,
&if_return);
__ bind(&enter_bytecode);
// Convert new bytecode offset to a Smi and save in the stackframe.
__ SmiTag(r4, kInterpreterBytecodeOffsetRegister);
__ StoreU64(r4,
MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
Generate_InterpreterEnterBytecode(masm);
__ bind(&function_entry_bytecode);
// If the code deoptimizes during the implicit function entry stack interrupt
// check, it will have a bailout ID of kFunctionEntryBytecodeOffset, which is
// not a valid bytecode offset. Detect this case and advance to the first
// actual bytecode.
__ mov(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
__ b(&enter_bytecode);
// We should never take the if_return path.
__ bind(&if_return);
__ Abort(AbortReason::kInvalidBytecodeAdvance);
}
void Builtins::Generate_InterpreterEnterAtBytecode(MacroAssembler* masm) {
Generate_InterpreterEnterBytecode(masm);
}
namespace {
void Generate_ContinueToBuiltinHelper(MacroAssembler* masm,
bool javascript_builtin,
bool with_result) {
const RegisterConfiguration* config(RegisterConfiguration::Default());
int allocatable_register_count = config->num_allocatable_general_registers();
Register scratch = ip;
if (with_result) {
if (javascript_builtin) {
__ mov(scratch, r2);
} else {
// Overwrite the hole inserted by the deoptimizer with the return value
// from the LAZY deopt point.
__ StoreU64(
r2, MemOperand(
sp, config->num_allocatable_general_registers() *
kSystemPointerSize +
BuiltinContinuationFrameConstants::kFixedFrameSize));
}
}
for (int i = allocatable_register_count - 1; i >= 0; --i) {
int code = config->GetAllocatableGeneralCode(i);
__ Pop(Register::from_code(code));
if (javascript_builtin && code == kJavaScriptCallArgCountRegister.code()) {
__ SmiUntag(Register::from_code(code));
}
}
if (javascript_builtin && with_result) {
// Overwrite the hole inserted by the deoptimizer with the return value from
// the LAZY deopt point. r0 contains the arguments count, the return value
// from LAZY is always the last argument.
constexpr int return_value_offset =
BuiltinContinuationFrameConstants::kFixedSlotCount -
kJSArgcReceiverSlots;
__ AddS64(r2, r2, Operand(return_value_offset));
__ ShiftLeftU64(r1, r2, Operand(kSystemPointerSizeLog2));
__ StoreU64(scratch, MemOperand(sp, r1));
// Recover arguments count.
__ SubS64(r2, r2, Operand(return_value_offset));
}
__ LoadU64(
fp,
MemOperand(sp, BuiltinContinuationFrameConstants::kFixedFrameSizeFromFp));
// Load builtin index (stored as a Smi) and use it to get the builtin start
// address from the builtins table.
UseScratchRegisterScope temps(masm);
Register builtin = temps.Acquire();
__ Pop(builtin);
__ AddS64(sp, sp,
Operand(BuiltinContinuationFrameConstants::kFixedFrameSizeFromFp));
__ Pop(r0);
__ mov(r14, r0);
__ LoadEntryFromBuiltinIndex(builtin, builtin);
__ Jump(builtin);
}
} // 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) {
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kNotifyDeoptimized);
}
DCHECK_EQ(kInterpreterAccumulatorRegister.code(), r2.code());
__ pop(r2);
__ Ret();
}
// static
void Builtins::Generate_FunctionPrototypeApply(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : argc
// -- sp[0] : receiver
// -- sp[4] : thisArg
// -- sp[8] : argArray
// -----------------------------------
// 1. Load receiver into r3, argArray into r4 (if present), remove all
// arguments from the stack (including the receiver), and push thisArg (if
// present) instead.
{
__ LoadRoot(r7, RootIndex::kUndefinedValue);
__ mov(r4, r7);
Label done;
__ LoadU64(r3, MemOperand(sp)); // receiver
__ CmpS64(r2, Operand(JSParameterCount(1)));
__ blt(&done);
__ LoadU64(r7, MemOperand(sp, kSystemPointerSize)); // thisArg
__ CmpS64(r2, Operand(JSParameterCount(2)));
__ blt(&done);
__ LoadU64(r4, MemOperand(sp, 2 * kSystemPointerSize)); // argArray
__ bind(&done);
__ DropArgumentsAndPushNewReceiver(r2, r7);
}
// ----------- S t a t e -------------
// -- r4 : argArray
// -- r3 : 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(r4, RootIndex::kNullValue, &no_arguments);
__ JumpIfRoot(r4, RootIndex::kUndefinedValue, &no_arguments);
// 4a. Apply the receiver to the given argArray.
__ TailCallBuiltin(Builtin::kCallWithArrayLike);
// 4b. The argArray is either null or undefined, so we tail call without any
// arguments to the receiver.
__ bind(&no_arguments);
{
__ mov(r2, Operand(JSParameterCount(0)));
__ TailCallBuiltin(Builtins::Call());
}
}
// static
void Builtins::Generate_FunctionPrototypeCall(MacroAssembler* masm) {
// 1. Get the callable to call (passed as receiver) from the stack.
__ Pop(r3);
// 2. Make sure we have at least one argument.
// r2: actual number of arguments
{
Label done;
__ CmpS64(r2, Operand(JSParameterCount(0)));
__ b(ne, &done);
__ PushRoot(RootIndex::kUndefinedValue);
__ AddS64(r2, r2, Operand(1));
__ bind(&done);
}
// 3. Adjust the actual number of arguments.
__ SubS64(r2, r2, Operand(1));
// 4. Call the callable.
__ TailCallBuiltin(Builtins::Call());
}
void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : argc
// -- sp[0] : receiver
// -- sp[4] : target (if argc >= 1)
// -- sp[8] : thisArgument (if argc >= 2)
// -- sp[12] : argumentsList (if argc == 3)
// -----------------------------------
// 1. Load target into r3 (if present), argumentsList into r4 (if present),
// remove all arguments from the stack (including the receiver), and push
// thisArgument (if present) instead.
{
__ LoadRoot(r3, RootIndex::kUndefinedValue);
__ mov(r7, r3);
__ mov(r4, r3);
Label done;
__ CmpS64(r2, Operand(JSParameterCount(1)));
__ blt(&done);
__ LoadU64(r3, MemOperand(sp, kSystemPointerSize)); // thisArg
__ CmpS64(r2, Operand(JSParameterCount(2)));
__ blt(&done);
__ LoadU64(r7, MemOperand(sp, 2 * kSystemPointerSize)); // argArray
__ CmpS64(r2, Operand(JSParameterCount(3)));
__ blt(&done);
__ LoadU64(r4, MemOperand(sp, 3 * kSystemPointerSize)); // argArray
__ bind(&done);
__ DropArgumentsAndPushNewReceiver(r2, r7);
}
// ----------- S t a t e -------------
// -- r4 : argumentsList
// -- r3 : 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.
__ TailCallBuiltin(Builtin::kCallWithArrayLike);
}
void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : argc
// -- sp[0] : receiver
// -- sp[4] : target
// -- sp[8] : argumentsList
// -- sp[12] : new.target (optional)
// -----------------------------------
// 1. Load target into r3 (if present), argumentsList into r4 (if present),
// new.target into r5 (if present, otherwise use target), remove all
// arguments from the stack (including the receiver), and push thisArgument
// (if present) instead.
{
__ LoadRoot(r3, RootIndex::kUndefinedValue);
__ mov(r4, r3);
Label done;
__ mov(r6, r3);
__ CmpS64(r2, Operand(JSParameterCount(1)));
__ blt(&done);
__ LoadU64(r3, MemOperand(sp, kSystemPointerSize)); // thisArg
__ mov(r5, r3);
__ CmpS64(r2, Operand(JSParameterCount(2)));
__ blt(&done);
__ LoadU64(r4, MemOperand(sp, 2 * kSystemPointerSize)); // argArray
__ CmpS64(r2, Operand(JSParameterCount(3)));
__ blt(&done);
__ LoadU64(r5, MemOperand(sp, 3 * kSystemPointerSize)); // argArray
__ bind(&done);
__ DropArgumentsAndPushNewReceiver(r2, r6);
}
// ----------- S t a t e -------------
// -- r4 : argumentsList
// -- r5 : new.target
// -- r3 : 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.
__ TailCallBuiltin(Builtin::kConstructWithArrayLike);
}
namespace {
// Allocate new stack space for |count| arguments and shift all existing
// arguments already on the stack. |pointer_to_new_space_out| points to the
// first free slot on the stack to copy additional arguments to and
// |argc_in_out| is updated to include |count|.
void Generate_AllocateSpaceAndShiftExistingArguments(
MacroAssembler* masm, Register count, Register argc_in_out,
Register pointer_to_new_space_out, Register scratch1, Register scratch2) {
DCHECK(!AreAliased(count, argc_in_out, pointer_to_new_space_out, scratch1,
scratch2));
Register old_sp = scratch1;
Register new_space = scratch2;
__ mov(old_sp, sp);
__ ShiftLeftU64(new_space, count, Operand(kSystemPointerSizeLog2));
__ AllocateStackSpace(new_space);
Register end = scratch2;
Register value = r1;
Register dest = pointer_to_new_space_out;
__ mov(dest, sp);
__ ShiftLeftU64(r0, argc_in_out, Operand(kSystemPointerSizeLog2));
__ AddS64(end, old_sp, r0);
Label loop, done;
__ bind(&loop);
__ CmpS64(old_sp, end);
__ bge(&done);
__ LoadU64(value, MemOperand(old_sp));
__ lay(old_sp, MemOperand(old_sp, kSystemPointerSize));
__ StoreU64(value, MemOperand(dest));
__ lay(dest, MemOperand(dest, kSystemPointerSize));
__ b(&loop);
__ bind(&done);
// Update total number of arguments.
__ AddS64(argc_in_out, argc_in_out, count);
}
} // namespace
// static
// TODO(v8:11615): Observe Code::kMaxArguments in CallOrConstructVarargs
void Builtins::Generate_CallOrConstructVarargs(MacroAssembler* masm,
Builtin target_builtin) {
// ----------- S t a t e -------------
// -- r3 : target
// -- r2 : number of parameters on the stack
// -- r4 : arguments list (a FixedArray)
// -- r6 : len (number of elements to push from args)
// -- r5 : new.target (for [[Construct]])
// -----------------------------------
Register scratch = ip;
if (v8_flags.debug_code) {
// Allow r4 to be a FixedArray, or a FixedDoubleArray if r6 == 0.
Label ok, fail;
__ AssertNotSmi(r4);
__ LoadTaggedField(scratch, FieldMemOperand(r4, HeapObject::kMapOffset));
__ LoadS16(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
__ CmpS64(scratch, Operand(FIXED_ARRAY_TYPE));
__ beq(&ok);
__ CmpS64(scratch, Operand(FIXED_DOUBLE_ARRAY_TYPE));
__ bne(&fail);
__ CmpS64(r6, Operand::Zero());
__ beq(&ok);
// Fall through.
__ bind(&fail);
__ Abort(AbortReason::kOperandIsNotAFixedArray);
__ bind(&ok);
}
// Check for stack overflow.
Label stack_overflow;
__ StackOverflowCheck(r6, scratch, &stack_overflow);
// Move the arguments already in the stack,
// including the receiver and the return address.
// r6: Number of arguments to make room for.
// r2: Number of arguments already on the stack.
// r7: Points to first free slot on the stack after arguments were shifted.
Generate_AllocateSpaceAndShiftExistingArguments(masm, r6, r2, r7, ip, r8);
// Push arguments onto the stack (thisArgument is already on the stack).
{
Label loop, no_args, skip;
__ CmpS64(r6, Operand::Zero());
__ beq(&no_args);
__ AddS64(r4, r4,
Operand(OFFSET_OF_DATA_START(FixedArray) - kHeapObjectTag -
kTaggedSize));
__ mov(r1, r6);
__ bind(&loop);
__ LoadTaggedField(scratch, MemOperand(r4, kTaggedSize), r0);
__ la(r4, MemOperand(r4, kTaggedSize));
__ CompareRoot(scratch, RootIndex::kTheHoleValue);
__ bne(&skip, Label::kNear);
__ LoadRoot(scratch, RootIndex::kUndefinedValue);
__ bind(&skip);
__ StoreU64(scratch, MemOperand(r7));
__ lay(r7, MemOperand(r7, kSystemPointerSize));
__ BranchOnCount(r1, &loop);
__ bind(&no_args);
}
// Tail-call to the actual Call or Construct builtin.
__ TailCallBuiltin(target_builtin);
__ bind(&stack_overflow);
__ TailCallRuntime(Runtime::kThrowStackOverflow);
}
// static
void Builtins::Generate_CallOrConstructForwardVarargs(MacroAssembler* masm,
CallOrConstructMode mode,
Builtin target_builtin) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r5 : the new.target (for [[Construct]] calls)
// -- r3 : the target to call (can be any Object)
// -- r4 : start index (to support rest parameters)
// -----------------------------------
Register scratch = r8;
if (mode == CallOrConstructMode::kConstruct) {
Label new_target_constructor, new_target_not_constructor;
__ JumpIfSmi(r5, &new_target_not_constructor);
__ LoadTaggedField(scratch, FieldMemOperand(r5, HeapObject::kMapOffset));
__ LoadU8(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
__ tmll(scratch, Operand(Map::Bits1::IsConstructorBit::kShift));
__ bne(&new_target_constructor);
__ bind(&new_target_not_constructor);
{
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::INTERNAL);
__ Push(r5);
__ CallRuntime(Runtime::kThrowNotConstructor);
__ Trap(); // Unreachable.
}
__ bind(&new_target_constructor);
}
Label stack_done, stack_overflow;
__ LoadU64(r7, MemOperand(fp, StandardFrameConstants::kArgCOffset));
__ SubS64(r7, r7, Operand(kJSArgcReceiverSlots));
__ SubS64(r7, r7, r4);
__ ble(&stack_done);
{
// ----------- S t a t e -------------
// -- r2 : the number of arguments already in the stack
// -- r3 : the target to call (can be any Object)
// -- r4 : start index (to support rest parameters)
// -- r5 : the new.target (for [[Construct]] calls)
// -- r6 : point to the caller stack frame
// -- r7 : number of arguments to copy, i.e. arguments count - start index
// -----------------------------------
// Check for stack overflow.
__ StackOverflowCheck(r7, scratch, &stack_overflow);
// Forward the arguments from the caller frame.
__ mov(r5, r5);
// Point to the first argument to copy (skipping the receiver).
__ AddS64(r6, fp,
Operand(CommonFrameConstants::kFixedFrameSizeAboveFp +
kSystemPointerSize));
__ ShiftLeftU64(scratch, r4, Operand(kSystemPointerSizeLog2));
__ AddS64(r6, r6, scratch);
// Move the arguments already in the stack,
// including the receiver and the return address.
// r7: Number of arguments to make room for.0
// r2: Number of arguments already on the stack.
// r4: Points to first free slot on the stack after arguments were shifted.
Generate_AllocateSpaceAndShiftExistingArguments(masm, r7, r2, r4, scratch,
ip);
// Copy arguments from the caller frame.
// TODO(victorgomes): Consider using forward order as potentially more cache
// friendly.
{
Label loop;
__ bind(&loop);
{
__ SubS64(r7, r7, Operand(1));
__ ShiftLeftU64(r1, r7, Operand(kSystemPointerSizeLog2));
__ LoadU64(scratch, MemOperand(r6, r1));
__ StoreU64(scratch, MemOperand(r4, r1));
__ CmpS64(r7, Operand::Zero());
__ bne(&loop);
}
}
}
__ bind(&stack_done);
// Tail-call to the actual Call or Construct builtin.
__ TailCallBuiltin(target_builtin);
__ bind(&stack_overflow);
__ TailCallRuntime(Runtime::kThrowStackOverflow);
}
// static
void Builtins::Generate_CallFunction(MacroAssembler* masm,
ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the function to call (checked to be a JSFunction)
// -----------------------------------
__ AssertCallableFunction(r3);
__ LoadTaggedField(
r4, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
// 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.
__ LoadTaggedField(cp, FieldMemOperand(r3, JSFunction::kContextOffset));
// We need to convert the receiver for non-native sloppy mode functions.
Label done_convert;
__ LoadU32(r5, FieldMemOperand(r4, SharedFunctionInfo::kFlagsOffset));
__ AndP(r0, r5,
Operand(SharedFunctionInfo::IsStrictBit::kMask |
SharedFunctionInfo::IsNativeBit::kMask));
__ bne(&done_convert);
{
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the function to call (checked to be a JSFunction)
// -- r4 : the shared function info.
// -- cp : the function context.
// -----------------------------------
if (mode == ConvertReceiverMode::kNullOrUndefined) {
// Patch receiver to global proxy.
__ LoadGlobalProxy(r5);
} else {
Label convert_to_object, convert_receiver;
__ LoadReceiver(r5);
__ JumpIfSmi(r5, &convert_to_object);
static_assert(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ CompareObjectType(r5, r6, r6, FIRST_JS_RECEIVER_TYPE);
__ bge(&done_convert);
if (mode != ConvertReceiverMode::kNotNullOrUndefined) {
Label convert_global_proxy;
__ JumpIfRoot(r5, RootIndex::kUndefinedValue, &convert_global_proxy);
__ JumpIfNotRoot(r5, RootIndex::kNullValue, &convert_to_object);
__ bind(&convert_global_proxy);
{
// Patch receiver to global proxy.
__ LoadGlobalProxy(r5);
}
__ 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(r2);
__ Push(r2, r3);
__ mov(r2, r5);
__ Push(cp);
__ CallBuiltin(Builtin::kToObject);
__ Pop(cp);
__ mov(r5, r2);
__ Pop(r2, r3);
__ SmiUntag(r2);
}
__ LoadTaggedField(
r4, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ bind(&convert_receiver);
}
__ StoreReceiver(r5);
}
__ bind(&done_convert);
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the function to call (checked to be a JSFunction)
// -- r4 : the shared function info.
// -- cp : the function context.
// -----------------------------------
__ LoadU16(
r4, FieldMemOperand(r4, SharedFunctionInfo::kFormalParameterCountOffset));
__ InvokeFunctionCode(r3, no_reg, r4, r2, InvokeType::kJump);
}
namespace {
void Generate_PushBoundArguments(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : target (checked to be a JSBoundFunction)
// -- r5 : new.target (only in case of [[Construct]])
// -----------------------------------
// Load [[BoundArguments]] into r4 and length of that into r6.
Label no_bound_arguments;
__ LoadTaggedField(
r4, FieldMemOperand(r3, JSBoundFunction::kBoundArgumentsOffset));
__ SmiUntagField(r6, FieldMemOperand(r4, offsetof(FixedArray, length_)));
__ LoadAndTestP(r6, r6);
__ beq(&no_bound_arguments);
{
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : target (checked to be a JSBoundFunction)
// -- r4 : the [[BoundArguments]] (implemented as FixedArray)
// -- r5 : new.target (only in case of [[Construct]])
// -- r6 : the number of [[BoundArguments]]
// -----------------------------------
Register scratch = r8;
// Reserve stack space for the [[BoundArguments]].
{
Label done;
__ ShiftLeftU64(scratch, r6, Operand(kSystemPointerSizeLog2));
__ SubS64(r1, sp, scratch);
// 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".
__ CmpU64(r1, __ StackLimitAsMemOperand(StackLimitKind::kRealStackLimit));
__ bgt(&done); // Signed comparison.
// Restore the stack pointer.
{
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
}
__ bind(&done);
}
// Pop receiver.
__ Pop(r7);
// Push [[BoundArguments]].
{
Label loop, done;
__ AddS64(r2, r2, r6); // Adjust effective number of arguments.
__ AddS64(r4, r4,
Operand(OFFSET_OF_DATA_START(FixedArray) - kHeapObjectTag));
__ bind(&loop);
__ SubS64(r1, r6, Operand(1));
__ ShiftLeftU64(r1, r1, Operand(kTaggedSizeLog2));
__ LoadTaggedField(scratch, MemOperand(r4, r1), r0);
__ Push(scratch);
__ SubS64(r6, r6, Operand(1));
__ bgt(&loop);
__ bind(&done);
}
// Push receiver.
__ Push(r7);
}
__ bind(&no_bound_arguments);
}
} // namespace
// static
void Builtins::Generate_CallBoundFunctionImpl(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the function to call (checked to be a JSBoundFunction)
// -----------------------------------
__ AssertBoundFunction(r3);
// Patch the receiver to [[BoundThis]].
__ LoadTaggedField(r5,
FieldMemOperand(r3, JSBoundFunction::kBoundThisOffset));
__ StoreReceiver(r5);
// Push the [[BoundArguments]] onto the stack.
Generate_PushBoundArguments(masm);
// Call the [[BoundTargetFunction]] via the Call builtin.
__ LoadTaggedField(
r3, FieldMemOperand(r3, JSBoundFunction::kBoundTargetFunctionOffset));
__ TailCallBuiltin(Builtins::Call());
}
// static
void Builtins::Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the target to call (can be any Object).
// -----------------------------------
Register target = r3;
Register map = r6;
Register instance_type = r7;
Register scratch = r8;
DCHECK(!AreAliased(r2, target, map, instance_type));
Label non_callable, class_constructor;
__ JumpIfSmi(target, &non_callable);
__ LoadMap(map, target);
__ CompareInstanceTypeRange(map, instance_type, scratch,
FIRST_CALLABLE_JS_FUNCTION_TYPE,
LAST_CALLABLE_JS_FUNCTION_TYPE);
__ TailCallBuiltin(Builtins::CallFunction(mode), le);
__ CmpS64(instance_type, Operand(JS_BOUND_FUNCTION_TYPE));
__ TailCallBuiltin(Builtin::kCallBoundFunction, eq);
// Check if target has a [[Call]] internal method.
{
Register flags = r6;
__ LoadU8(flags, FieldMemOperand(map, Map::kBitFieldOffset));
map = no_reg;
__ TestBit(flags, Map::Bits1::IsCallableBit::kShift);
__ beq(&non_callable);
}
// Check if target is a proxy and call CallProxy external builtin
__ CmpS64(instance_type, Operand(JS_PROXY_TYPE));
__ TailCallBuiltin(Builtin::kCallProxy, eq);
// Check if target is a wrapped function and call CallWrappedFunction external
// builtin
__ CmpS64(instance_type, Operand(JS_WRAPPED_FUNCTION_TYPE));
__ TailCallBuiltin(Builtin::kCallWrappedFunction, eq);
// ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
// Check that the function is not a "classConstructor".
__ CmpS64(instance_type, Operand(JS_CLASS_CONSTRUCTOR_TYPE));
__ beq(&class_constructor);
// 2. Call to something else, which might have a [[Call]] internal method (if
// not we raise an exception).
// Overwrite the original receiver the (original) target.
__ StoreReceiver(target);
// Let the "call_as_function_delegate" take care of the rest.
__ LoadNativeContextSlot(target, Context::CALL_AS_FUNCTION_DELEGATE_INDEX);
__ TailCallBuiltin(
Builtins::CallFunction(ConvertReceiverMode::kNotNullOrUndefined));
// 3. Call to something that is not callable.
__ bind(&non_callable);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(target);
__ CallRuntime(Runtime::kThrowCalledNonCallable);
__ Trap(); // Unreachable.
}
// 4. The function is a "classConstructor", need to raise an exception.
__ bind(&class_constructor);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(target);
__ CallRuntime(Runtime::kThrowConstructorNonCallableError);
__ Trap(); // Unreachable.
}
}
// static
void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the constructor to call (checked to be a JSFunction)
// -- r5 : the new target (checked to be a constructor)
// -----------------------------------
__ AssertConstructor(r3, r1);
__ AssertFunction(r3);
// Calling convention for function specific ConstructStubs require
// r4 to contain either an AllocationSite or undefined.
__ LoadRoot(r4, RootIndex::kUndefinedValue);
Label call_generic_stub;
// Jump to JSBuiltinsConstructStub or JSConstructStubGeneric.
__ LoadTaggedField(
r6, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ LoadU32(r6, FieldMemOperand(r6, SharedFunctionInfo::kFlagsOffset));
__ AndP(r6, Operand(SharedFunctionInfo::ConstructAsBuiltinBit::kMask));
__ beq(&call_generic_stub);
__ TailCallBuiltin(Builtin::kJSBuiltinsConstructStub);
__ bind(&call_generic_stub);
__ TailCallBuiltin(Builtin::kJSConstructStubGeneric);
}
// static
void Builtins::Generate_ConstructBoundFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the function to call (checked to be a JSBoundFunction)
// -- r5 : the new target (checked to be a constructor)
// -----------------------------------
__ AssertConstructor(r3, r1);
__ AssertBoundFunction(r3);
// Push the [[BoundArguments]] onto the stack.
Generate_PushBoundArguments(masm);
// Patch new.target to [[BoundTargetFunction]] if new.target equals target.
Label skip;
__ CompareTagged(r3, r5);
__ bne(&skip);
__ LoadTaggedField(
r5, FieldMemOperand(r3, JSBoundFunction::kBoundTargetFunctionOffset));
__ bind(&skip);
// Construct the [[BoundTargetFunction]] via the Construct builtin.
__ LoadTaggedField(
r3, FieldMemOperand(r3, JSBoundFunction::kBoundTargetFunctionOffset));
__ TailCallBuiltin(Builtin::kConstruct);
}
// static
void Builtins::Generate_Construct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : the number of arguments
// -- r3 : the constructor to call (can be any Object)
// -- r5 : the new target (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -----------------------------------
Register target = r3;
Register map = r6;
Register instance_type = r7;
Register scratch = r8;
DCHECK(!AreAliased(r2, target, map, instance_type, scratch));
// Check if target is a Smi.
Label non_constructor, non_proxy;
__ JumpIfSmi(target, &non_constructor);
// Check if target has a [[Construct]] internal method.
__ LoadTaggedField(map, FieldMemOperand(target, HeapObject::kMapOffset));
{
Register flags = r4;
DCHECK(!AreAliased(r2, target, map, instance_type, flags));
__ LoadU8(flags, FieldMemOperand(map, Map::kBitFieldOffset));
__ TestBit(flags, Map::Bits1::IsConstructorBit::kShift);
__ beq(&non_constructor);
}
// Dispatch based on instance type.
__ CompareInstanceTypeRange(map, instance_type, scratch,
FIRST_JS_FUNCTION_TYPE, LAST_JS_FUNCTION_TYPE);
__ TailCallBuiltin(Builtin::kConstructFunction, le);
// Only dispatch to bound functions after checking whether they are
// constructors.
__ CmpS64(instance_type, Operand(JS_BOUND_FUNCTION_TYPE));
__ TailCallBuiltin(Builtin::kConstructBoundFunction, eq);
// Only dispatch to proxies after checking whether they are constructors.
__ CmpS64(instance_type, Operand(JS_PROXY_TYPE));
__ bne(&non_proxy);
__ TailCallBuiltin(Builtin::kConstructProxy);
// Called Construct on an exotic Object with a [[Construct]] internal method.
__ bind(&non_proxy);
{
// Overwrite the original receiver with the (original) target.
__ StoreReceiver(target);
// Let the "call_as_constructor_delegate" take care of the rest.
__ LoadNativeContextSlot(target,
Context::CALL_AS_CONSTRUCTOR_DELEGATE_INDEX);
__ TailCallBuiltin(Builtins::CallFunction());
}
// Called Construct on an Object that doesn't have a [[Construct]] internal
// method.
__ bind(&non_constructor);
__ TailCallBuiltin(Builtin::kConstructedNonConstructable);
}
#ifdef V8_ENABLE_MAGLEV
void Builtins::Generate_MaglevFunctionEntryStackCheck(MacroAssembler* masm,
bool save_new_target) {
// Input (r0): Stack size (Smi).
// This builtin can be invoked just after Maglev's prologue.
// All registers are available, except (possibly) new.target.
ASM_CODE_COMMENT(masm);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ AssertSmi(r2);
if (save_new_target) {
__ Push(kJavaScriptCallNewTargetRegister);
}
__ Push(r2);
__ CallRuntime(Runtime::kStackGuardWithGap, 1);
if (save_new_target) {
__ Pop(kJavaScriptCallNewTargetRegister);
}
}
__ Ret();
}
#endif // V8_ENABLE_MAGLEV
#if V8_ENABLE_WEBASSEMBLY
struct SaveWasmParamsScope {
explicit SaveWasmParamsScope(MacroAssembler* masm) : masm(masm) {
for (Register gp_param_reg : wasm::kGpParamRegisters) {
gp_regs.set(gp_param_reg);
}
for (DoubleRegister fp_param_reg : wasm::kFpParamRegisters) {
fp_regs.set(fp_param_reg);
}
CHECK_EQ(gp_regs.Count(), arraysize(wasm::kGpParamRegisters));
CHECK_EQ(fp_regs.Count(), arraysize(wasm::kFpParamRegisters));
CHECK_EQ(WasmLiftoffSetupFrameConstants::kNumberOfSavedGpParamRegs + 1,
gp_regs.Count());
CHECK_EQ(WasmLiftoffSetupFrameConstants::kNumberOfSavedFpParamRegs,
fp_regs.Count());
__ MultiPush(gp_regs);
__ MultiPushF64OrV128(fp_regs, r1);
}
~SaveWasmParamsScope() {
__ MultiPopF64OrV128(fp_regs, r1);
__ MultiPop(gp_regs);
}
RegList gp_regs;
DoubleRegList fp_regs;
MacroAssembler* masm;
};
void Builtins::Generate_WasmLiftoffFrameSetup(MacroAssembler* masm) {
Register func_index = wasm::kLiftoffFrameSetupFunctionReg;
Register vector = ip;
Register scratch = r0;
Label allocate_vector, done;
__ LoadTaggedField(
vector, FieldMemOperand(kWasmImplicitArgRegister,
WasmTrustedInstanceData::kFeedbackVectorsOffset));
__ ShiftLeftU64(scratch, func_index, Operand(kTaggedSizeLog2));
__ AddS64(vector, vector, scratch);
__ LoadTaggedField(vector,
FieldMemOperand(vector, OFFSET_OF_DATA_START(FixedArray)));
__ JumpIfSmi(vector, &allocate_vector);
__ bind(&done);
__ push(kWasmImplicitArgRegister);
__ push(vector);
__ Ret();
__ bind(&allocate_vector);
// Feedback vector doesn't exist yet. Call the runtime to allocate it.
// We temporarily change the frame type for this, because we need special
// handling by the stack walker in case of GC.
__ mov(scratch,
Operand(StackFrame::TypeToMarker(StackFrame::WASM_LIFTOFF_SETUP)));
__ StoreU64(scratch, MemOperand(sp));
// Save current return address as it will get clobbered during CallRuntime.
__ push(r14);
{
SaveWasmParamsScope save_params(masm);
// Arguments to the runtime function: instance data, func_index.
__ push(kWasmImplicitArgRegister);
__ SmiTag(func_index);
__ push(func_index);
// Allocate a stack slot where the runtime function can spill a pointer
// to the {NativeModule}.
__ push(r10);
__ LoadSmiLiteral(cp, Smi::zero());
__ CallRuntime(Runtime::kWasmAllocateFeedbackVector, 3);
__ mov(vector, kReturnRegister0);
// Saved parameters are restored at the end of this block.
}
__ pop(r14);
__ mov(scratch, Operand(StackFrame::TypeToMarker(StackFrame::WASM)));
__ StoreU64(scratch, MemOperand(sp));
__ b(&done);
}
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);
{
HardAbortScope hard_abort(masm); // Avoid calls to Abort.
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
{
SaveWasmParamsScope save_params(masm);
// Push the instance data as an explicit argument to the runtime function.
__ push(kWasmImplicitArgRegister);
// Push the function index as second argument.
__ push(kWasmCompileLazyFuncIndexRegister);
// Initialize the JavaScript context with 0. CEntry will use it to
// set the current context on the isolate.
__ LoadSmiLiteral(cp, Smi::zero());
__ CallRuntime(Runtime::kWasmCompileLazy, 2);
// The runtime function returns the jump table slot offset as a Smi. Use
// that to compute the jump target in ip.
__ SmiUntag(kReturnRegister0);
__ mov(ip, kReturnRegister0);
// Saved parameters are restored at the end of this block.
}
// After the instance data register has been restored, we can add the jump
// table start to the jump table offset already stored in r8.
__ LoadU64(r0,
FieldMemOperand(kWasmImplicitArgRegister,
WasmTrustedInstanceData::kJumpTableStartOffset));
__ AddS64(ip, ip, r0);
}
// Finally, jump to the jump table slot for the function.
__ Jump(ip);
}
void Builtins::Generate_WasmDebugBreak(MacroAssembler* masm) {
HardAbortScope hard_abort(masm); // Avoid calls to Abort.
{
FrameAndConstantPoolScope scope(masm, StackFrame::WASM_DEBUG_BREAK);
// Save all parameter registers. They might hold live values, we restore
// them after the runtime call.
__ MultiPush(WasmDebugBreakFrameConstants::kPushedGpRegs);
__ MultiPushF64OrV128(WasmDebugBreakFrameConstants::kPushedFpRegs, ip);
// Initialize the JavaScript context with 0. CEntry will use it to
// set the current context on the isolate.
__ LoadSmiLiteral(cp, Smi::zero());
__ CallRuntime(Runtime::kWasmDebugBreak, 0);
// Restore registers.
__ MultiPopF64OrV128(WasmDebugBreakFrameConstants::kPushedFpRegs, ip);
__ MultiPop(WasmDebugBreakFrameConstants::kPushedGpRegs);
}
__ Ret();
}
namespace {
// Check that the stack was in the old state (if generated code assertions are
// enabled), and switch to the new state.
void SwitchStackState(MacroAssembler* masm, Register jmpbuf, Register tmp,
wasm::JumpBuffer::StackState old_state,
wasm::JumpBuffer::StackState new_state) {
__ LoadU32(tmp, MemOperand(jmpbuf, wasm::kJmpBufStateOffset));
Label ok;
__ JumpIfEqual(tmp, old_state, &ok);
__ Trap();
__ bind(&ok);
__ mov(tmp, Operand(new_state));
__ StoreU32(tmp, MemOperand(jmpbuf, wasm::kJmpBufStateOffset));
}
// Switch the stack pointer.
void SwitchStackPointer(MacroAssembler* masm, Register jmpbuf) {
__ LoadU64(sp, MemOperand(jmpbuf, wasm::kJmpBufSpOffset));
}
void FillJumpBuffer(MacroAssembler* masm, Register jmpbuf, Label* target,
Register tmp) {
__ mov(tmp, sp);
__ StoreU64(tmp, MemOperand(jmpbuf, wasm::kJmpBufSpOffset));
__ StoreU64(fp, MemOperand(jmpbuf, wasm::kJmpBufFpOffset));
__ LoadStackLimit(tmp, StackLimitKind::kRealStackLimit);
__ StoreU64(tmp, MemOperand(jmpbuf, wasm::kJmpBufStackLimitOffset));
__ GetLabelAddress(tmp, target);
// Stash the address in the jump buffer.
__ StoreU64(tmp, MemOperand(jmpbuf, wasm::kJmpBufPcOffset));
}
void LoadJumpBuffer(MacroAssembler* masm, Register jmpbuf, bool load_pc,
Register tmp, wasm::JumpBuffer::StackState expected_state) {
SwitchStackPointer(masm, jmpbuf);
__ LoadU64(fp, MemOperand(jmpbuf, wasm::kJmpBufFpOffset));
SwitchStackState(masm, jmpbuf, tmp, expected_state, wasm::JumpBuffer::Active);
if (load_pc) {
__ LoadU64(tmp, MemOperand(jmpbuf, wasm::kJmpBufPcOffset));
__ Jump(tmp);
}
// The stack limit in StackGuard is set separately under the ExecutionAccess
// lock.
}
void SaveState(MacroAssembler* masm, Register active_continuation, Register tmp,
Label* suspend) {
Register jmpbuf = tmp;
__ LoadU64(jmpbuf, FieldMemOperand(active_continuation,
WasmContinuationObject::kStackOffset));
__ AddS64(jmpbuf, jmpbuf, Operand(wasm::StackMemory::jmpbuf_offset()));
UseScratchRegisterScope temps(masm);
FillJumpBuffer(masm, jmpbuf, suspend, temps.Acquire());
}
void LoadTargetJumpBuffer(MacroAssembler* masm, Register target_continuation,
Register tmp,
wasm::JumpBuffer::StackState expected_state) {
Register target_jmpbuf = target_continuation;
__ LoadU64(target_jmpbuf,
FieldMemOperand(target_continuation,
WasmContinuationObject::kStackOffset));
__ AddS64(target_jmpbuf, target_jmpbuf,
Operand(wasm::StackMemory::jmpbuf_offset()));
__ Zero(MemOperand(fp, StackSwitchFrameConstants::kGCScanSlotCountOffset));
// Switch stack!
LoadJumpBuffer(masm, target_jmpbuf, false, tmp, expected_state);
}
// Updates the stack limit and central stack info, and validates the switch.
void SwitchStacks(MacroAssembler* masm, Register old_continuation,
bool return_switch,
const std::initializer_list<Register> keep) {
using ER = ExternalReference;
for (auto reg : keep) {
__ Push(reg);
}
{
__ PrepareCallCFunction(2, r0);
FrameScope scope(masm, StackFrame::MANUAL);
__ Move(kCArgRegs[0], ExternalReference::isolate_address(masm->isolate()));
__ Move(kCArgRegs[1], old_continuation);
__ CallCFunction(
return_switch ? ER::wasm_return_switch() : ER::wasm_switch_stacks(), 2);
}
for (auto it = std::rbegin(keep); it != std::rend(keep); ++it) {
__ Pop(*it);
}
}
void ReloadParentContinuation(MacroAssembler* masm, Register return_reg,
Register return_value, Register context,
Register tmp1, Register tmp2, Register tmp3) {
Register active_continuation = tmp1;
__ LoadRoot(active_continuation, RootIndex::kActiveContinuation);
// Set a null pointer in the jump buffer's SP slot to indicate to the stack
// frame iterator that this stack is empty.
Register jmpbuf = tmp2;
__ LoadU64(jmpbuf, FieldMemOperand(active_continuation,
WasmContinuationObject::kStackOffset));
__ AddS64(jmpbuf, jmpbuf, Operand(wasm::StackMemory::jmpbuf_offset()));
__ Zero(MemOperand(jmpbuf, wasm::kJmpBufSpOffset));
{
UseScratchRegisterScope temps(masm);
Register scratch = temps.Acquire();
SwitchStackState(masm, jmpbuf, scratch, wasm::JumpBuffer::Active,
wasm::JumpBuffer::Retired);
}
Register parent = tmp2;
__ LoadTaggedField(parent,
FieldMemOperand(active_continuation,
WasmContinuationObject::kParentOffset));
// Update active continuation root.
int32_t active_continuation_offset =
MacroAssembler::RootRegisterOffsetForRootIndex(
RootIndex::kActiveContinuation);
__ StoreU64(parent, MemOperand(kRootRegister, active_continuation_offset));
jmpbuf = parent;
__ LoadU64(jmpbuf,
FieldMemOperand(parent, WasmContinuationObject::kStackOffset));
__ AddS64(jmpbuf, jmpbuf, Operand(wasm::StackMemory::jmpbuf_offset()));
// Switch stack!
SwitchStacks(masm, active_continuation, true,
{return_reg, return_value, context, jmpbuf});
LoadJumpBuffer(masm, jmpbuf, false, tmp3, wasm::JumpBuffer::Inactive);
}
void RestoreParentSuspender(MacroAssembler* masm, Register tmp1,
Register tmp2) {
Register suspender = tmp1;
__ LoadRoot(suspender, RootIndex::kActiveSuspender);
__ LoadTaggedField(
suspender,
FieldMemOperand(suspender, WasmSuspenderObject::kParentOffset));
int32_t active_suspender_offset =
MacroAssembler::RootRegisterOffsetForRootIndex(
RootIndex::kActiveSuspender);
__ StoreU64(suspender, MemOperand(kRootRegister, active_suspender_offset));
}
void ResetStackSwitchFrameStackSlots(MacroAssembler* masm) {
__ Zero(MemOperand(fp, StackSwitchFrameConstants::kResultArrayOffset),
MemOperand(fp, StackSwitchFrameConstants::kImplicitArgOffset));
}
class RegisterAllocator {
public:
class Scoped {
public:
Scoped(RegisterAllocator* allocator, Register* reg)
: allocator_(allocator), reg_(reg) {}
~Scoped() { allocator_->Free(reg_); }
private:
RegisterAllocator* allocator_;
Register* reg_;
};
explicit RegisterAllocator(const RegList& registers)
: initial_(registers), available_(registers) {}
void Ask(Register* reg) {
DCHECK_EQ(*reg, no_reg);
DCHECK(!available_.is_empty());
*reg = available_.PopFirst();
allocated_registers_.push_back(reg);
}
bool registerIsAvailable(const Register& reg) { return available_.has(reg); }
void Pinned(const Register& requested, Register* reg) {
DCHECK(registerIsAvailable(requested));
*reg = requested;
Reserve(requested);
allocated_registers_.push_back(reg);
}
void Free(Register* reg) {
DCHECK_NE(*reg, no_reg);
available_.set(*reg);
*reg = no_reg;
allocated_registers_.erase(
find(allocated_registers_.begin(), allocated_registers_.end(), reg));
}
void Reserve(const Register& reg) {
if (reg == no_reg) {
return;
}
DCHECK(registerIsAvailable(reg));
available_.clear(reg);
}
void Reserve(const Register& reg1, const Register& reg2,
const Register& reg3 = no_reg, const Register& reg4 = no_reg,
const Register& reg5 = no_reg, const Register& reg6 = no_reg) {
Reserve(reg1);
Reserve(reg2);
Reserve(reg3);
Reserve(reg4);
Reserve(reg5);
Reserve(reg6);
}
bool IsUsed(const Register& reg) {
return initial_.has(reg) && !registerIsAvailable(reg);
}
void ResetExcept(const Register& reg1 = no_reg, const Register& reg2 = no_reg,
const Register& reg3 = no_reg, const Register& reg4 = no_reg,
const Register& reg5 = no_reg,
const Register& reg6 = no_reg) {
available_ = initial_;
available_.clear(reg1);
available_.clear(reg2);
available_.clear(reg3);
available_.clear(reg4);
available_.clear(reg5);
available_.clear(reg6);
auto it = allocated_registers_.begin();
while (it != allocated_registers_.end()) {
if (registerIsAvailable(**it)) {
**it = no_reg;
it = allocated_registers_.erase(it);
} else {
it++;
}
}
}
static RegisterAllocator WithAllocatableGeneralRegisters() {
RegList list;
const RegisterConfiguration* config(RegisterConfiguration::Default());
for (int i = 0; i < config->num_allocatable_general_registers(); ++i) {
int code = config->GetAllocatableGeneralCode(i);
Register candidate = Register::from_code(code);
list.set(candidate);
}
return RegisterAllocator(list);
}
private:
std::vector<Register*> allocated_registers_;
const RegList initial_;
RegList available_;
};
#define DEFINE_REG(Name) \
Register Name = no_reg; \
regs.Ask(&Name);
#define DEFINE_REG_W(Name) \
DEFINE_REG(Name); \
Name = Name.W();
#define ASSIGN_REG(Name) regs.Ask(&Name);
#define ASSIGN_REG_W(Name) \
ASSIGN_REG(Name); \
Name = Name.W();
#define DEFINE_PINNED(Name, Reg) \
Register Name = no_reg; \
regs.Pinned(Reg, &Name);
#define ASSIGN_PINNED(Name, Reg) regs.Pinned(Reg, &Name);
#define DEFINE_SCOPED(Name) \
DEFINE_REG(Name) \
RegisterAllocator::Scoped scope_##Name(&regs, &Name);
#define FREE_REG(Name) regs.Free(&Name);
// Loads the context field of the WasmTrustedInstanceData or WasmImportData
// depending on the data's type, and places the result in the input register.
void GetContextFromImplicitArg(MacroAssembler* masm, Register data,
Register scratch) {
__ LoadTaggedField(scratch, FieldMemOperand(data, HeapObject::kMapOffset));
__ CompareInstanceType(scratch, scratch, WASM_TRUSTED_INSTANCE_DATA_TYPE);
Label instance;
Label end;
__ beq(&instance);
__ LoadTaggedField(
data, FieldMemOperand(data, WasmImportData::kNativeContextOffset));
__ jmp(&end);
__ bind(&instance);
__ LoadTaggedField(
data,
FieldMemOperand(data, WasmTrustedInstanceData::kNativeContextOffset));
__ bind(&end);
}
} // namespace
void Builtins::Generate_WasmToJsWrapperAsm(MacroAssembler* masm) {
// Push registers in reverse order so that they are on the stack like
// in an array, with the first item being at the lowest address.
DoubleRegList fp_regs;
for (DoubleRegister fp_param_reg : wasm::kFpParamRegisters) {
fp_regs.set(fp_param_reg);
}
__ MultiPushDoubles(fp_regs);
// Push the GP registers in reverse order so that they are on the stack like
// in an array, with the first item being at the lowest address.
RegList gp_regs;
for (size_t i = arraysize(wasm::kGpParamRegisters) - 1; i > 0; --i) {
gp_regs.set(wasm::kGpParamRegisters[i]);
}
__ MultiPush(gp_regs);
// Reserve a slot for the signature.
__ Push(r2);
__ TailCallBuiltin(Builtin::kWasmToJsWrapperCSA);
}
void Builtins::Generate_WasmTrapHandlerLandingPad(MacroAssembler* masm) {
__ Trap();
}
void Builtins::Generate_WasmSuspend(MacroAssembler* masm) {
auto regs = RegisterAllocator::WithAllocatableGeneralRegisters();
// Set up the stackframe.
__ EnterFrame(StackFrame::STACK_SWITCH);
DEFINE_PINNED(suspender, r2);
DEFINE_PINNED(context, kContextRegister);
__ SubS64(
sp, sp,
Operand(StackSwitchFrameConstants::kNumSpillSlots * kSystemPointerSize));
// Set a sentinel value for the spill slots visited by the GC.
ResetStackSwitchFrameStackSlots(masm);
// -------------------------------------------
// Save current state in active jump buffer.
// -------------------------------------------
Label resume;
DEFINE_REG(continuation);
__ LoadRoot(continuation, RootIndex::kActiveContinuation);
DEFINE_REG(jmpbuf);
DEFINE_REG(scratch);
__ LoadU64(jmpbuf, FieldMemOperand(continuation,
WasmContinuationObject::kStackOffset));
__ AddS64(jmpbuf, jmpbuf, Operand(wasm::StackMemory::jmpbuf_offset()));
FillJumpBuffer(masm, jmpbuf, &resume, scratch);
SwitchStackState(masm, jmpbuf, scratch, wasm::JumpBuffer::Active,
wasm::JumpBuffer::Suspended);
regs.ResetExcept(suspender, continuation);
DEFINE_REG(suspender_continuation);
__ LoadTaggedField(
suspender_continuation,
FieldMemOperand(suspender, WasmSuspenderObject::kContinuationOffset));
if (v8_flags.debug_code) {
// -------------------------------------------
// Check that the suspender's continuation is the active continuation.
// -------------------------------------------
// TODO(thibaudm): Once we add core stack-switching instructions, this
// check will not hold anymore: it's possible that the active continuation
// changed (due to an internal switch), so we have to update the suspender.
__ CmpS64(suspender_continuation, continuation);
Label ok;
__ beq(&ok);
__ Trap();
__ bind(&ok);
}
// -------------------------------------------
// Update roots.
// -------------------------------------------
DEFINE_REG(caller);
__ LoadTaggedField(caller,
FieldMemOperand(suspender_continuation,
WasmContinuationObject::kParentOffset));
int32_t active_continuation_offset =
MacroAssembler::RootRegisterOffsetForRootIndex(
RootIndex::kActiveContinuation);
__ StoreU64(caller, MemOperand(kRootRegister, active_continuation_offset));
DEFINE_REG(parent);
__ LoadTaggedField(
parent, FieldMemOperand(suspender, WasmSuspenderObject::kParentOffset));
int32_t active_suspender_offset =
MacroAssembler::RootRegisterOffsetForRootIndex(
RootIndex::kActiveSuspender);
__ StoreU64(parent, MemOperand(kRootRegister, active_suspender_offset));
regs.ResetExcept(suspender, caller, continuation);
// -------------------------------------------
// Load jump buffer.
// -------------------------------------------
SwitchStacks(masm, continuation, false, {caller, suspender});
FREE_REG(continuation);
ASSIGN_REG(jmpbuf);
__ LoadU64(jmpbuf,
FieldMemOperand(caller, WasmContinuationObject::kStackOffset));
__ AddS64(jmpbuf, jmpbuf, Operand(wasm::StackMemory::jmpbuf_offset()));
__ LoadTaggedField(
kReturnRegister0,
FieldMemOperand(suspender, WasmSuspenderObject::kPromiseOffset));
MemOperand GCScanSlotPlace =
MemOperand(fp, StackSwitchFrameConstants::kGCScanSlotCountOffset);
__ Zero(GCScanSlotPlace);
ASSIGN_REG(scratch)
LoadJumpBuffer(masm, jmpbuf, true, scratch, wasm::JumpBuffer::Inactive);
if (v8_flags.debug_code) {
__ Trap();
}
__ bind(&resume);
__ LeaveFrame(StackFrame::STACK_SWITCH);
__ b(r14);
}
namespace {
// Resume the suspender stored in the closure. We generate two variants of this
// builtin: the onFulfilled variant resumes execution at the saved PC and
// forwards the value, the onRejected variant throws the value.
void Generate_WasmResumeHelper(MacroAssembler* masm, wasm::OnResume on_resume) {
auto regs = RegisterAllocator::WithAllocatableGeneralRegisters();
__ EnterFrame(StackFrame::STACK_SWITCH);
DEFINE_PINNED(closure, kJSFunctionRegister); // r3
__ SubS64(
sp, sp,
Operand(StackSwitchFrameConstants::kNumSpillSlots * kSystemPointerSize));
// Set a sentinel value for the spill slots visited by the GC.
ResetStackSwitchFrameStackSlots(masm);
regs.ResetExcept(closure);
// -------------------------------------------
// Load suspender from closure.
// -------------------------------------------
DEFINE_REG(sfi);
__ LoadTaggedField(
sfi,
MemOperand(
closure,
wasm::ObjectAccess::SharedFunctionInfoOffsetInTaggedJSFunction()));
FREE_REG(closure);
// Suspender should be ObjectRegister register to be used in
// RecordWriteField calls later.
DEFINE_PINNED(suspender, WriteBarrierDescriptor::ObjectRegister());
DEFINE_REG(resume_data);
__ LoadTaggedField(
resume_data,
FieldMemOperand(sfi, SharedFunctionInfo::kUntrustedFunctionDataOffset));
__ LoadTaggedField(
suspender,
FieldMemOperand(resume_data, WasmResumeData::kSuspenderOffset));
regs.ResetExcept(suspender);
// -------------------------------------------
// Save current state.
// -------------------------------------------
Label suspend;
DEFINE_REG(active_continuation);
__ LoadRoot(active_continuation, RootIndex::kActiveContinuation);
DEFINE_REG(current_jmpbuf);
DEFINE_REG(scratch);
__ LoadU64(current_jmpbuf,
FieldMemOperand(active_continuation,
WasmContinuationObject::kStackOffset));
__ AddS64(current_jmpbuf, current_jmpbuf,
Operand(wasm::StackMemory::jmpbuf_offset()));
FillJumpBuffer(masm, current_jmpbuf, &suspend, scratch);
SwitchStackState(masm, current_jmpbuf, scratch, wasm::JumpBuffer::Active,
wasm::JumpBuffer::Inactive);
FREE_REG(current_jmpbuf);
// -------------------------------------------
// Set the suspender and continuation parents and update the roots
// -------------------------------------------
DEFINE_REG(active_suspender);
__ LoadRoot(active_suspender, RootIndex::kActiveSuspender);
__ StoreTaggedField(
active_suspender,
FieldMemOperand(suspender, WasmSuspenderObject::kParentOffset));
__ RecordWriteField(suspender, WasmSuspenderObject::kParentOffset,
active_suspender, ip, kLRHasBeenSaved,
SaveFPRegsMode::kIgnore);
int32_t active_suspender_offset =
MacroAssembler::RootRegisterOffsetForRootIndex(
RootIndex::kActiveSuspender);
__ StoreU64(suspender, MemOperand(kRootRegister, active_suspender_offset));
// Next line we are going to load a field from suspender, but we have to use
// the same register for target_continuation to use it in RecordWriteField.
// So, free suspender here to use pinned reg, but load from it next line.
FREE_REG(suspender);
DEFINE_PINNED(target_continuation, WriteBarrierDescriptor::ObjectRegister());
suspender = target_continuation;
__ LoadTaggedField(
target_continuation,
FieldMemOperand(suspender, WasmSuspenderObject::kContinuationOffset));
suspender = no_reg;
__ StoreTaggedField(active_continuation,
FieldMemOperand(target_continuation,
WasmContinuationObject::kParentOffset));
DEFINE_REG(old_continuation);
__ Move(old_continuation, active_continuation);
__ RecordWriteField(
target_continuation, WasmContinuationObject::kParentOffset,
active_continuation, ip, kLRHasBeenSaved, SaveFPRegsMode::kIgnore);
FREE_REG(active_continuation);
int32_t active_continuation_offset =
MacroAssembler::RootRegisterOffsetForRootIndex(
RootIndex::kActiveContinuation);
__ StoreU64(target_continuation,
MemOperand(kRootRegister, active_continuation_offset));
SwitchStacks(masm, old_continuation, false, {target_continuation});
regs.ResetExcept(target_continuation);
// -------------------------------------------
// Load state from target jmpbuf (longjmp).
// -------------------------------------------
regs.Reserve(kReturnRegister0);
DEFINE_REG(target_jmpbuf);
ASSIGN_REG(scratch);
__ LoadU64(target_jmpbuf,
FieldMemOperand(target_continuation,
WasmContinuationObject::kStackOffset));
__ AddS64(target_jmpbuf, target_jmpbuf,
Operand(wasm::StackMemory::jmpbuf_offset()));
// Move resolved value to return register.
__ LoadU64(kReturnRegister0, MemOperand(fp, 3 * kSystemPointerSize));
MemOperand GCScanSlotPlace =
MemOperand(fp, StackSwitchFrameConstants::kGCScanSlotCountOffset);
__ Zero(GCScanSlotPlace);
if (on_resume == wasm::OnResume::kThrow) {
// Switch to the continuation's stack without restoring the PC.
LoadJumpBuffer(masm, target_jmpbuf, false, scratch,
wasm::JumpBuffer::Suspended);
// Pop this frame now. The unwinder expects that the first STACK_SWITCH
// frame is the outermost one.
__ LeaveFrame(StackFrame::STACK_SWITCH);
// Forward the onRejected value to kThrow.
__ Push(kReturnRegister0);
__ CallRuntime(Runtime::kThrow);
} else {
// Resume the continuation normally.
LoadJumpBuffer(masm, target_jmpbuf, true, scratch,
wasm::JumpBuffer::Suspended);
}
if (v8_flags.debug_code) {
__ Trap();
}
__ bind(&suspend);
__ LeaveFrame(StackFrame::STACK_SWITCH);
// Pop receiver + parameter.
__ AddS64(sp, sp, Operand(2 * kSystemPointerSize));
__ b(r14);
}
} // namespace
void Builtins::Generate_WasmResume(MacroAssembler* masm) {
Generate_WasmResumeHelper(masm, wasm::OnResume::kContinue);
}
void Builtins::Generate_WasmReject(MacroAssembler* masm) {
Generate_WasmResumeHelper(masm, wasm::OnResume::kThrow);
}
void Builtins::Generate_WasmOnStackReplace(MacroAssembler* masm) {
// Only needed on x64.
__ Trap();
}
namespace {
void SwitchToAllocatedStack(MacroAssembler* masm, RegisterAllocator& regs,
Register wasm_instance, Register wrapper_buffer,
Register& original_fp, Register& new_wrapper_buffer,
Label* suspend) {
ResetStackSwitchFrameStackSlots(masm);
DEFINE_SCOPED(scratch)
DEFINE_REG(target_continuation)
__ LoadRoot(target_continuation, RootIndex::kActiveContinuation);
DEFINE_REG(parent_continuation)
__ LoadTaggedField(parent_continuation,
FieldMemOperand(target_continuation,
WasmContinuationObject::kParentOffset));
SaveState(masm, parent_continuation, scratch, suspend);
SwitchStacks(masm, parent_continuation, false,
{wasm_instance, wrapper_buffer});
FREE_REG(parent_continuation);
// Save the old stack's fp in r13, and use it to access the parameters in
// the parent frame.
regs.Pinned(r13, &original_fp);
__ Move(original_fp, fp);
__ LoadRoot(target_continuation, RootIndex::kActiveContinuation);
LoadTargetJumpBuffer(masm, target_continuation, scratch,
wasm::JumpBuffer::Suspended);
FREE_REG(target_continuation);
// Push the loaded fp. We know it is null, because there is no frame yet,
// so we could also push 0 directly. In any case we need to push it,
// because this marks the base of the stack segment for
// the stack frame iterator.
__ EnterFrame(StackFrame::STACK_SWITCH);
int stack_space =
RoundUp(StackSwitchFrameConstants::kNumSpillSlots * kSystemPointerSize +
JSToWasmWrapperFrameConstants::kWrapperBufferSize,
16);
__ SubS64(sp, sp, Operand(stack_space));
__ EnforceStackAlignment();
ASSIGN_REG(new_wrapper_buffer)
__ Move(new_wrapper_buffer, sp);
// Copy data needed for return handling from old wrapper buffer to new one.
// kWrapperBufferRefReturnCount will be copied too, because 8 bytes are copied
// at the same time.
static_assert(JSToWasmWrapperFrameConstants::kWrapperBufferRefReturnCount ==
JSToWasmWrapperFrameConstants::kWrapperBufferReturnCount + 4);
__ LoadU64(
scratch,
MemOperand(wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferReturnCount));
__ StoreU64(
scratch,
MemOperand(new_wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferReturnCount));
__ LoadU64(
scratch,
MemOperand(
wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferSigRepresentationArray));
__ StoreU64(
scratch,
MemOperand(
new_wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferSigRepresentationArray));
}
void SwitchBackAndReturnPromise(MacroAssembler* masm, RegisterAllocator& regs,
wasm::Promise mode, Label* return_promise) {
regs.ResetExcept();
// The return value of the wasm function becomes the parameter of the
// FulfillPromise builtin, and the promise is the return value of this
// wrapper.
static const Builtin_FulfillPromise_InterfaceDescriptor desc;
DEFINE_PINNED(promise, desc.GetRegisterParameter(0));
DEFINE_PINNED(return_value, desc.GetRegisterParameter(1));
DEFINE_SCOPED(tmp);
DEFINE_SCOPED(tmp2);
DEFINE_SCOPED(tmp3);
if (mode == wasm::kPromise) {
__ Move(return_value, kReturnRegister0);
__ LoadRoot(promise, RootIndex::kActiveSuspender);
__ LoadTaggedField(
promise, FieldMemOperand(promise, WasmSuspenderObject::kPromiseOffset));
}
__ LoadU64(kContextRegister,
MemOperand(fp, StackSwitchFrameConstants::kImplicitArgOffset));
GetContextFromImplicitArg(masm, kContextRegister, tmp);
ReloadParentContinuation(masm, promise, return_value, kContextRegister, tmp,
tmp2, tmp3);
RestoreParentSuspender(masm, tmp, tmp2);
if (mode == wasm::kPromise) {
__ mov(tmp, Operand(1));
__ StoreU64(
tmp, MemOperand(fp, StackSwitchFrameConstants::kGCScanSlotCountOffset));
__ Push(promise);
__ CallBuiltin(Builtin::kFulfillPromise);
__ Pop(promise);
}
FREE_REG(promise);
FREE_REG(return_value);
__ bind(return_promise);
}
void GenerateExceptionHandlingLandingPad(MacroAssembler* masm,
RegisterAllocator& regs,
Label* return_promise) {
regs.ResetExcept();
static const Builtin_RejectPromise_InterfaceDescriptor desc;
DEFINE_PINNED(promise, desc.GetRegisterParameter(0));
DEFINE_PINNED(reason, desc.GetRegisterParameter(1));
DEFINE_PINNED(debug_event, desc.GetRegisterParameter(2));
int catch_handler = __ pc_offset();
DEFINE_SCOPED(thread_in_wasm_flag_addr);
thread_in_wasm_flag_addr = r4;
// Unset thread_in_wasm_flag.
__ LoadU64(
thread_in_wasm_flag_addr,
MemOperand(kRootRegister, Isolate::thread_in_wasm_flag_address_offset()));
__ mov(r0, Operand(0));
__ StoreU32(r0, MemOperand(thread_in_wasm_flag_addr, 0), no_reg);
// The exception becomes the parameter of the RejectPromise builtin, and the
// promise is the return value of this wrapper.
__ Move(reason, kReturnRegister0);
__ LoadRoot(promise, RootIndex::kActiveSuspender);
__ LoadTaggedField(
promise, FieldMemOperand(promise, WasmSuspenderObject::kPromiseOffset));
DEFINE_SCOPED(tmp);
DEFINE_SCOPED(tmp2);
DEFINE_SCOPED(tmp3);
__ LoadU64(kContextRegister,
MemOperand(fp, StackSwitchFrameConstants::kImplicitArgOffset));
GetContextFromImplicitArg(masm, kContextRegister, tmp);
ReloadParentContinuation(masm, promise, reason, kContextRegister, tmp, tmp2,
tmp3);
RestoreParentSuspender(masm, tmp, tmp2);
__ mov(tmp, Operand(1));
__ StoreU64(
tmp, MemOperand(fp, StackSwitchFrameConstants::kGCScanSlotCountOffset));
__ Push(promise);
__ LoadRoot(debug_event, RootIndex::kTrueValue);
__ CallBuiltin(Builtin::kRejectPromise);
__ Pop(promise);
// Run the rest of the wrapper normally (deconstruct the frame, ...).
__ b(return_promise);
masm->isolate()->builtins()->SetJSPIPromptHandlerOffset(catch_handler);
}
void JSToWasmWrapperHelper(MacroAssembler* masm, wasm::Promise mode) {
bool stack_switch = mode == wasm::kPromise || mode == wasm::kStressSwitch;
auto regs = RegisterAllocator::WithAllocatableGeneralRegisters();
__ EnterFrame(stack_switch ? StackFrame::STACK_SWITCH
: StackFrame::JS_TO_WASM);
__ AllocateStackSpace(StackSwitchFrameConstants::kNumSpillSlots *
kSystemPointerSize);
// Load the implicit argument (instance data or import data) from the frame.
DEFINE_PINNED(implicit_arg, kWasmImplicitArgRegister);
__ LoadU64(implicit_arg,
MemOperand(fp, JSToWasmWrapperFrameConstants::kImplicitArgOffset));
DEFINE_PINNED(wrapper_buffer,
WasmJSToWasmWrapperDescriptor::WrapperBufferRegister());
Label suspend;
Register original_fp = no_reg;
Register new_wrapper_buffer = no_reg;
if (stack_switch) {
SwitchToAllocatedStack(masm, regs, implicit_arg, wrapper_buffer,
original_fp, new_wrapper_buffer, &suspend);
} else {
original_fp = fp;
new_wrapper_buffer = wrapper_buffer;
}
regs.ResetExcept(original_fp, wrapper_buffer, implicit_arg,
new_wrapper_buffer);
{
__ StoreU64(
new_wrapper_buffer,
MemOperand(fp, JSToWasmWrapperFrameConstants::kWrapperBufferOffset));
if (stack_switch) {
__ StoreU64(
implicit_arg,
MemOperand(fp, StackSwitchFrameConstants::kImplicitArgOffset));
DEFINE_SCOPED(scratch)
__ LoadU64(
scratch,
MemOperand(original_fp,
JSToWasmWrapperFrameConstants::kResultArrayParamOffset));
__ StoreU64(
scratch,
MemOperand(fp, StackSwitchFrameConstants::kResultArrayOffset));
}
}
{
DEFINE_SCOPED(result_size);
__ LoadU64(
result_size,
MemOperand(wrapper_buffer, JSToWasmWrapperFrameConstants::
kWrapperBufferStackReturnBufferSize));
__ ShiftLeftU64(r0, result_size, Operand(kSystemPointerSizeLog2));
__ SubS64(sp, sp, r0);
}
__ StoreU64(
sp,
MemOperand(
new_wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferStackReturnBufferStart));
if (stack_switch) {
FREE_REG(new_wrapper_buffer)
}
FREE_REG(implicit_arg)
for (auto reg : wasm::kGpParamRegisters) {
regs.Reserve(reg);
}
// The first GP parameter holds the trusted instance data or the import data.
// This is handled specially.
int stack_params_offset =
(arraysize(wasm::kGpParamRegisters) - 1) * kSystemPointerSize +
arraysize(wasm::kFpParamRegisters) * kDoubleSize;
{
Register params_start = ip;
__ LoadU64(
params_start,
MemOperand(wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferParamStart));
{
// Push stack parameters on the stack.
DEFINE_SCOPED(params_end);
__ LoadU64(
params_end,
MemOperand(wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferParamEnd));
DEFINE_SCOPED(last_stack_param);
__ AddS64(last_stack_param, params_start, Operand(stack_params_offset));
Label loop_start;
__ bind(&loop_start);
Label finish_stack_params;
__ CmpS64(last_stack_param, params_end);
__ bge(&finish_stack_params);
// Push parameter
{
__ AddS64(params_end, params_end, Operand(-kSystemPointerSize));
__ LoadU64(r0, MemOperand(params_end));
__ push(r0);
}
__ jmp(&loop_start);
__ bind(&finish_stack_params);
}
size_t next_offset = 0;
for (size_t i = 1; i < arraysize(wasm::kGpParamRegisters); i++) {
// Check that {params_start} does not overlap with any of the parameter
// registers, so that we don't overwrite it by accident with the loads
// below.
DCHECK_NE(params_start, wasm::kGpParamRegisters[i]);
__ LoadU64(wasm::kGpParamRegisters[i],
MemOperand(params_start, next_offset));
next_offset += kSystemPointerSize;
}
for (size_t i = 0; i < arraysize(wasm::kFpParamRegisters); i++) {
__ LoadF64(wasm::kFpParamRegisters[i],
MemOperand(params_start, next_offset));
next_offset += kDoubleSize;
}
DCHECK_EQ(next_offset, stack_params_offset);
}
{
DEFINE_SCOPED(thread_in_wasm_flag_addr);
__ LoadU64(thread_in_wasm_flag_addr,
MemOperand(kRootRegister,
Isolate::thread_in_wasm_flag_address_offset()));
DEFINE_SCOPED(scratch);
__ mov(scratch, Operand(1));
__ StoreU32(scratch, MemOperand(thread_in_wasm_flag_addr, 0), no_reg);
}
__ Zero(MemOperand(fp, StackSwitchFrameConstants::kGCScanSlotCountOffset));
{
DEFINE_SCOPED(call_target);
__ LoadWasmCodePointer(
call_target,
MemOperand(wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferCallTarget));
__ CallWasmCodePointer(call_target);
}
regs.ResetExcept();
// The wrapper_buffer has to be in r4 as the correct parameter register.
regs.Reserve(kReturnRegister0, kReturnRegister1);
ASSIGN_PINNED(wrapper_buffer, r4);
{
DEFINE_SCOPED(thread_in_wasm_flag_addr);
__ LoadU64(thread_in_wasm_flag_addr,
MemOperand(kRootRegister,
Isolate::thread_in_wasm_flag_address_offset()));
__ mov(r0, Operand(0));
__ StoreU32(r0, MemOperand(thread_in_wasm_flag_addr, 0), no_reg);
}
__ LoadU64(
wrapper_buffer,
MemOperand(fp, JSToWasmWrapperFrameConstants::kWrapperBufferOffset));
__ StoreF64(
wasm::kFpReturnRegisters[0],
MemOperand(
wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferFPReturnRegister1));
__ StoreF64(
wasm::kFpReturnRegisters[1],
MemOperand(
wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferFPReturnRegister2));
__ StoreU64(
wasm::kGpReturnRegisters[0],
MemOperand(
wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferGPReturnRegister1));
__ StoreU64(
wasm::kGpReturnRegisters[1],
MemOperand(
wrapper_buffer,
JSToWasmWrapperFrameConstants::kWrapperBufferGPReturnRegister2));
// Call the return value builtin with
// r2: wasm instance.
// r3: the result JSArray for multi-return.
// r4: pointer to the byte buffer which contains all parameters.
if (stack_switch) {
__ LoadU64(r3,
MemOperand(fp, StackSwitchFrameConstants::kResultArrayOffset));
__ LoadU64(r2,
MemOperand(fp, StackSwitchFrameConstants::kImplicitArgOffset));
} else {
__ LoadU64(
r3,
MemOperand(fp, JSToWasmWrapperFrameConstants::kResultArrayParamOffset));
__ LoadU64(
r2, MemOperand(fp, JSToWasmWrapperFrameConstants::kImplicitArgOffset));
}
Register scratch = r5;
GetContextFromImplicitArg(masm, r2, scratch);
__ CallBuiltin(Builtin::kJSToWasmHandleReturns);
Label return_promise;
if (stack_switch) {
SwitchBackAndReturnPromise(masm, regs, mode, &return_promise);
}
__ bind(&suspend);
__ LeaveFrame(stack_switch ? StackFrame::STACK_SWITCH
: StackFrame::JS_TO_WASM);
// Despite returning to the different location for regular and stack switching
// versions, incoming argument count matches both cases:
// instance and result array without suspend or
// or promise resolve/reject params for callback.
__ AddS64(sp, sp, Operand(2 * kSystemPointerSize));
__ b(r14);
// Catch handler for the stack-switching wrapper: reject the promise with the
// thrown exception.
if (mode == wasm::kPromise) {
GenerateExceptionHandlingLandingPad(masm, regs, &return_promise);
}
}
} // namespace
void Builtins::Generate_JSToWasmWrapperAsm(MacroAssembler* masm) {
JSToWasmWrapperHelper(masm, wasm::kNoPromise);
}
void Builtins::Generate_WasmReturnPromiseOnSuspendAsm(MacroAssembler* masm) {
JSToWasmWrapperHelper(masm, wasm::kPromise);
}
void Builtins::Generate_JSToWasmStressSwitchStacksAsm(MacroAssembler* masm) {
JSToWasmWrapperHelper(masm, wasm::kStressSwitch);
}
namespace {
static constexpr Register kOldSPRegister = r13;
void SwitchToTheCentralStackIfNeeded(MacroAssembler* masm, Register argc_input,
Register target_input,
Register argv_input) {
using ER = ExternalReference;
// kOldSPRegister used as a switch flag, if it is zero - no switch performed
// if it is not zero, it contains old sp value.
__ mov(kOldSPRegister, Operand(0));
// Using r4 & r5 as temporary registers, because they will be rewritten
// before exiting to native code anyway.
ER on_central_stack_flag_loc = ER::Create(
IsolateAddressId::kIsOnCentralStackFlagAddress, masm->isolate());
__ Move(r1, on_central_stack_flag_loc);
__ LoadU8(r1, MemOperand(r1));
Label do_not_need_to_switch;
__ CmpU32(r1, Operand(0));
__ bne(&do_not_need_to_switch);
// Switch to central stack.
__ Move(kOldSPRegister, sp);
Register central_stack_sp = r4;
DCHECK(!AreAliased(central_stack_sp, argc_input, argv_input, target_input));
{
__ Push(argc_input);
__ Push(target_input);
__ Push(argv_input);
__ PrepareCallCFunction(2, r0);
__ Move(kCArgRegs[0], ER::isolate_address());
__ Move(kCArgRegs[1], kOldSPRegister);
__ CallCFunction(ER::wasm_switch_to_the_central_stack(), 2,
SetIsolateDataSlots::kNo);
__ Move(central_stack_sp, kReturnRegister0);
__ Pop(argv_input);
__ Pop(target_input);
__ Pop(argc_input);
}
static constexpr int kReturnAddressSlotOffset = 1 * kSystemPointerSize;
static constexpr int kPadding = 1 * kSystemPointerSize;
__ SubS64(sp, central_stack_sp, Operand(kReturnAddressSlotOffset + kPadding));
__ EnforceStackAlignment();
// When we switch stack we leave home space allocated on the old stack.
// Allocate home space on the central stack to prevent stack corruption.
// zLinux ABI requires caller's frame to have sufficient space for callee
// preserved register save area.
__ lay(sp, MemOperand(sp, -kNumRequiredStackFrameSlots * kSystemPointerSize));
// Update the sp saved in the frame.
// It will be used to calculate the callee pc during GC.
// The pc is going to be on the new stack segment, so rewrite it here.
__ AddS64(central_stack_sp, sp, kStackFrameSPSlot * kSystemPointerSize);
__ StoreU64(central_stack_sp, MemOperand(fp, ExitFrameConstants::kSPOffset));
__ bind(&do_not_need_to_switch);
}
void SwitchFromTheCentralStackIfNeeded(MacroAssembler* masm) {
using ER = ExternalReference;
Label no_stack_change;
__ CmpU64(kOldSPRegister, Operand(0));
__ beq(&no_stack_change);
__ Move(sp, kOldSPRegister);
{
__ Push(kReturnRegister0, kReturnRegister1);
__ PrepareCallCFunction(1, r0);
__ Move(kCArgRegs[0], ER::isolate_address());
__ CallCFunction(ER::wasm_switch_from_the_central_stack(), 1,
SetIsolateDataSlots::kNo);
__ Pop(kReturnRegister0, kReturnRegister1);
}
__ bind(&no_stack_change);
}
} // namespace
#endif // V8_ENABLE_WEBASSEMBLY
void Builtins::Generate_CEntry(MacroAssembler* masm, int result_size,
ArgvMode argv_mode, bool builtin_exit_frame,
bool switch_to_central_stack) {
// Called from JavaScript; parameters are on stack as if calling JS function.
// r2: number of arguments including receiver
// r3: 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 == ArgvMode::kRegister:
// r4: pointer to the first argument
using ER = ExternalReference;
// Move input arguments to more convenient registers.
static constexpr Register argc_input = r2;
static constexpr Register target_fun = r7; // C callee-saved
static constexpr Register argv = r3;
static constexpr Register scratch = ip;
#if V8_OS_ZOS
static constexpr Register argc_sav = r9; // C callee-saved
#else
static constexpr Register argc_sav = r6; // C callee-saved
#endif
__ mov(target_fun, argv);
if (argv_mode == ArgvMode::kRegister) {
// Move argv into the correct register.
__ mov(argv, r4);
} else {
// Compute the argv pointer.
__ ShiftLeftU64(argv, argc_input, Operand(kSystemPointerSizeLog2));
__ lay(argv, MemOperand(argv, sp, -kSystemPointerSize));
}
// Enter the exit frame that transitions from JavaScript to C++.
FrameScope scope(masm, StackFrame::MANUAL);
int arg_stack_space = 0;
// Pass buffer for return value on stack if necessary
bool needs_return_buffer =
result_size == 2 && !ABI_RETURNS_OBJECTPAIR_IN_REGS;
if (needs_return_buffer) {
arg_stack_space += result_size;
}
// 64-bit linux pass Argument object by reference not value
arg_stack_space += 2;
__ EnterExitFrame(
scratch, arg_stack_space,
builtin_exit_frame ? StackFrame::BUILTIN_EXIT : StackFrame::EXIT);
// Store a copy of argc, argv in callee-saved registers for later.
__ mov(argc_sav, argc_input);
__ mov(r8, argv);
// r2: number of arguments including receiver
// r6: number of arguments including receiver (C callee-saved)
// r3, r8: pointer to the first argument
// r7: pointer to builtin function (C callee-saved)
// Result returned in registers or stack, depending on result size and ABI.
Register isolate_reg = r4;
if (needs_return_buffer) {
// The return value is 16-byte non-scalar value.
// Use frame storage reserved by calling function to pass return
// buffer as implicit first argument in R2. Shfit original parameters
// by one register each.
__ mov(r4, r3);
__ mov(r3, r2);
__ la(r2,
MemOperand(sp, (kStackFrameExtraParamSlot + 1) * kSystemPointerSize));
isolate_reg = r5;
// Clang doesn't preserve r2 (result buffer)
// write to r8 (preserved) before entry
__ mov(r8, r2);
}
#if V8_ENABLE_WEBASSEMBLY
if (switch_to_central_stack) {
SwitchToTheCentralStackIfNeeded(masm, argc_input, target_fun, argv);
}
#endif // V8_ENABLE_WEBASSEMBLY
// Call C built-in.
__ Move(isolate_reg, ER::isolate_address());
#if V8_OS_ZOS
// Shuffle input arguments to match XPLINK ABI
__ mov(r1, r2);
__ mov(r2, r3);
__ mov(r3, r4);
// Save stack arguments to XPLINK extra param slot
const int stack_args = 3;
const int stack_space = kXPLINKStackFrameExtraParamSlot + stack_args;
__ lay(r4, MemOperand(sp, -((stack_space * kSystemPointerSize) +
kStackPointerBias)));
__ StoreMultipleP(
r5, target_fun,
MemOperand(r4, kStackPointerBias +
kXPLINKStackFrameExtraParamSlot * kSystemPointerSize));
// Load environment from slot 0 of fn desc.
__ LoadU64(r5, MemOperand(target_fun));
// Load function pointer from slot 1 of fn desc.
__ LoadU64(r8, MemOperand(target_fun, kSystemPointerSize));
__ StoreReturnAddressAndCall(r8);
#if V8_ENABLE_WEBASSEMBLY
if (switch_to_central_stack) {
SwitchFromTheCentralStackIfNeeded(masm);
}
#endif // V8_ENABLE_WEBASSEMBLY
// r9 and r13 are used to store argc and argv on z/OS instead
// of r6 and r8 since r6 is not callee saved.
__ mov(r6, r9);
__ mov(r8, r13);
// Shuffler arguments based on result_size to match XPLINK ABI
if (result_size == 1) {
__ mov(r2, r3);
} else if (result_size == 2) {
__ mov(r3, r2);
__ mov(r2, r1);
} else {
__ mov(r4, r3);
__ mov(r3, r2);
__ mov(r2, r1);
}
#else
__ StoreReturnAddressAndCall(target_fun);
#if V8_ENABLE_WEBASSEMBLY
if (switch_to_central_stack) {
SwitchFromTheCentralStackIfNeeded(masm);
}
#endif // V8_ENABLE_WEBASSEMBLY
// If return value is on the stack, pop it to registers.
if (needs_return_buffer) {
__ mov(r2, r8);
__ LoadU64(r3, MemOperand(r2, kSystemPointerSize));
__ LoadU64(r2, MemOperand(r2));
}
#endif
// Check result for exception sentinel.
Label exception_returned;
__ CompareRoot(r2, RootIndex::kException);
__ beq(&exception_returned, Label::kNear);
// Check that there is no exception, otherwise we
// should have returned the exception sentinel.
if (v8_flags.debug_code) {
Label okay;
ER exception_address =
ER::Create(IsolateAddressId::kExceptionAddress, masm->isolate());
__ LoadU64(scratch,
__ ExternalReferenceAsOperand(exception_address, no_reg));
__ CompareRoot(scratch, RootIndex::kTheHoleValue);
// Cannot use check here as it attempts to generate call into runtime.
__ beq(&okay, Label::kNear);
__ stop();
__ bind(&okay);
}
// Exit C frame and return.
// r2:r3: result
// sp: stack pointer
// fp: frame pointer
// r6: still holds argc (C caller-saved).
__ LeaveExitFrame(scratch);
if (argv_mode == ArgvMode::kStack) {
DCHECK(!AreAliased(scratch, argc_sav));
__ ShiftLeftU64(scratch, argc_sav, Operand(kSystemPointerSizeLog2));
__ AddS64(sp, sp, scratch);
}
__ b(r14);
// Handling of exception.
__ bind(&exception_returned);
ER pending_handler_context_address = ER::Create(
IsolateAddressId::kPendingHandlerContextAddress, masm->isolate());
ER pending_handler_entrypoint_address = ER::Create(
IsolateAddressId::kPendingHandlerEntrypointAddress, masm->isolate());
ER pending_handler_fp_address =
ER::Create(IsolateAddressId::kPendingHandlerFPAddress, masm->isolate());
ER pending_handler_sp_address =
ER::Create(IsolateAddressId::kPendingHandlerSPAddress, masm->isolate());
// Ask the runtime for help to determine the handler. This will set r3 to
// contain the current exception, don't clobber it.
{
FrameScope scope(masm, StackFrame::MANUAL);
__ PrepareCallCFunction(3, 0, r2);
__ mov(kCArgRegs[0], Operand::Zero());
__ mov(kCArgRegs[1], Operand::Zero());
__ Move(kCArgRegs[2], ER::isolate_address());
__ CallCFunction(ER::Create(Runtime::kUnwindAndFindExceptionHandler), 3,
SetIsolateDataSlots::kNo);
}
// Retrieve the handler context, SP and FP.
__ Move(cp, pending_handler_context_address);
__ LoadU64(cp, MemOperand(cp));
__ Move(sp, pending_handler_sp_address);
__ LoadU64(sp, MemOperand(sp));
__ Move(fp, pending_handler_fp_address);
__ LoadU64(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;
__ CmpS64(cp, Operand::Zero());
__ beq(&skip, Label::kNear);
__ StoreU64(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ bind(&skip);
// Clear c_entry_fp, like we do in `LeaveExitFrame`.
ER c_entry_fp_address =
ER::Create(IsolateAddressId::kCEntryFPAddress, masm->isolate());
__ mov(scratch, Operand::Zero());
__ StoreU64(scratch,
__ ExternalReferenceAsOperand(c_entry_fp_address, no_reg));
// Compute the handler entry address and jump to it.
__ LoadU64(scratch, __ ExternalReferenceAsOperand(
pending_handler_entrypoint_address, no_reg));
__ Jump(scratch);
}
#if V8_ENABLE_WEBASSEMBLY
void Builtins::Generate_WasmHandleStackOverflow(MacroAssembler* masm) {
using ER = ExternalReference;
Register frame_base = WasmHandleStackOverflowDescriptor::FrameBaseRegister();
Register gap = WasmHandleStackOverflowDescriptor::GapRegister();
{
DCHECK_NE(kCArgRegs[1], frame_base);
DCHECK_NE(kCArgRegs[3], frame_base);
__ mov(kCArgRegs[3], gap);
__ mov(kCArgRegs[1], sp);
__ SubS64(kCArgRegs[2], frame_base, kCArgRegs[1]);
__ mov(kCArgRegs[4], fp);
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(kCArgRegs[3]);
__ PrepareCallCFunction(5, r0);
__ Move(kCArgRegs[0], ER::isolate_address());
__ CallCFunction(ER::wasm_grow_stack(), 5);
__ pop(gap);
DCHECK_NE(kReturnRegister0, gap);
}
Label call_runtime;
// wasm_grow_stack returns zero if it cannot grow a stack.
__ CmpU64(kReturnRegister0, Operand(0));
__ beq(&call_runtime);
// Calculate old FP - SP offset to adjust FP accordingly to new SP.
__ SubS64(fp, fp, sp);
__ AddS64(fp, fp, kReturnRegister0);
__ mov(sp, kReturnRegister0);
{
UseScratchRegisterScope temps(masm);
Register scratch = temps.Acquire();
__ mov(scratch,
Operand(StackFrame::TypeToMarker(StackFrame::WASM_SEGMENT_START)));
__ StoreU64(scratch, MemOperand(fp, TypedFrameConstants::kFrameTypeOffset));
}
__ Ret();
__ bind(&call_runtime);
// If wasm_grow_stack returns zero interruption or stack overflow
// should be handled by runtime call.
{
__ LoadU64(kWasmImplicitArgRegister,
MemOperand(fp, WasmFrameConstants::kWasmInstanceDataOffset));
__ LoadTaggedField(
cp, FieldMemOperand(kWasmImplicitArgRegister,
WasmTrustedInstanceData::kNativeContextOffset));
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::INTERNAL);
__ SmiTag(gap);
__ push(gap);
__ CallRuntime(Runtime::kWasmStackGuard);
__ LeaveFrame(StackFrame::INTERNAL);
__ Ret();
}
}
#endif // V8_ENABLE_WEBASSEMBLY
void Builtins::Generate_DoubleToI(MacroAssembler* masm) {
Label out_of_range, only_low, negate, done, fastpath_done;
Register result_reg = r2;
HardAbortScope hard_abort(masm); // Avoid calls to Abort.
// Immediate values for this stub fit in instructions, so it's safe to use ip.
Register scratch = GetRegisterThatIsNotOneOf(result_reg);
Register scratch_low = GetRegisterThatIsNotOneOf(result_reg, scratch);
Register scratch_high =
GetRegisterThatIsNotOneOf(result_reg, scratch, scratch_low);
DoubleRegister double_scratch = kScratchDoubleReg;
__ Push(result_reg, scratch);
// Account for saved regs.
int argument_offset = 2 * kSystemPointerSize;
// Load double input.
__ LoadF64(double_scratch, MemOperand(sp, argument_offset));
// Do fast-path convert from double to int.
__ ConvertDoubleToInt64(result_reg, double_scratch);
// Test for overflow
__ TestIfInt32(result_reg);
__ beq(&fastpath_done, Label::kNear);
__ Push(scratch_high, scratch_low);
// Account for saved regs.
argument_offset += 2 * kSystemPointerSize;
__ LoadU32(scratch_high,
MemOperand(sp, argument_offset + Register::kExponentOffset));
__ LoadU32(scratch_low,
MemOperand(sp, argument_offset + Register::kMantissaOffset));
__ ExtractBitMask(scratch, scratch_high, HeapNumber::kExponentMask);
// Load scratch with exponent - 1. This is faster than loading
// with exponent because Bias + 1 = 1024 which is a *S390* immediate value.
static_assert(HeapNumber::kExponentBias + 1 == 1024);
__ SubS64(scratch, Operand(HeapNumber::kExponentBias + 1));
// If exponent is greater than or equal to 84, the 32 less significant
// bits are 0s (2^84 = 1, 52 significant bits, 32 uncoded bits),
// the result is 0.
// Compare exponent with 84 (compare exponent - 1 with 83).
__ CmpS64(scratch, Operand(83));
__ bge(&out_of_range, Label::kNear);
// If we reach this code, 31 <= exponent <= 83.
// So, we don't have to handle cases where 0 <= exponent <= 20 for
// which we would need to shift right the high part of the mantissa.
// Scratch contains exponent - 1.
// Load scratch with 52 - exponent (load with 51 - (exponent - 1)).
__ mov(r0, Operand(51));
__ SubS64(scratch, r0, scratch);
__ CmpS64(scratch, Operand::Zero());
__ ble(&only_low, Label::kNear);
// 21 <= exponent <= 51, shift scratch_low and scratch_high
// to generate the result.
__ ShiftRightU32(scratch_low, scratch_low, scratch);
// Scratch contains: 52 - exponent.
// We needs: exponent - 20.
// So we use: 32 - scratch = 32 - 52 + exponent = exponent - 20.
__ mov(r0, Operand(32));
__ SubS64(scratch, r0, scratch);
__ ExtractBitMask(result_reg, scratch_high, HeapNumber::kMantissaMask);
// Set the implicit 1 before the mantissa part in scratch_high.
static_assert(HeapNumber::kMantissaBitsInTopWord >= 16);
__ mov(r0, Operand(1 << ((HeapNumber::kMantissaBitsInTopWord)-16)));
__ ShiftLeftU64(r0, r0, Operand(16));
__ OrP(result_reg, result_reg, r0);
__ ShiftLeftU32(r0, result_reg, scratch);
__ OrP(result_reg, scratch_low, r0);
__ b(&negate, Label::kNear);
__ bind(&out_of_range);
__ mov(result_reg, Operand::Zero());
__ b(&done, Label::kNear);
__ bind(&only_low);
// 52 <= exponent <= 83, shift only scratch_low.
// On entry, scratch contains: 52 - exponent.
__ lcgr(scratch, scratch);
__ ShiftLeftU32(result_reg, scratch_low, scratch);
__ bind(&negate);
// If input was positive, scratch_high ASR 31 equals 0 and
// scratch_high LSR 31 equals zero.
// New result = (result eor 0) + 0 = result.
// If the input was negative, we have to negate the result.
// Input_high ASR 31 equals 0xFFFFFFFF and scratch_high LSR 31 equals 1.
// New result = (result eor 0xFFFFFFFF) + 1 = 0 - result.
__ ShiftRightS32(r0, scratch_high, Operand(31));
__ lgfr(r0, r0);
__ ShiftRightU64(r0, r0, Operand(32));
__ XorP(result_reg, r0);
__ ShiftRightU32(r0, scratch_high, Operand(31));
__ AddS64(result_reg, r0);
__ bind(&done);
__ Pop(scratch_high, scratch_low);
argument_offset -= 2 * kSystemPointerSize;
__ bind(&fastpath_done);
__ StoreU64(result_reg, MemOperand(sp, argument_offset));
__ Pop(result_reg, scratch);
__ Ret();
}
void Builtins::Generate_CallApiCallbackImpl(MacroAssembler* masm,
CallApiCallbackMode mode) {
// ----------- S t a t e -------------
// CallApiCallbackMode::kOptimizedNoProfiling/kOptimized modes:
// -- r4 : api function address
// Both modes:
// -- r4 : arguments count (not including the receiver)
// -- r5 : FunctionTemplateInfo
// -- cp
// -- sp[0] : receiver
// -- sp[8] : first argument
// -- ...
// -- sp[(argc) * 8] : last argument
// -----------------------------------
Register function_callback_info_arg = kCArgRegs[0];
Register api_function_address = no_reg;
Register argc = no_reg;
Register func_templ = no_reg;
Register topmost_script_having_context = no_reg;
Register scratch = r6;
switch (mode) {
case CallApiCallbackMode::kGeneric:
argc = CallApiCallbackGenericDescriptor::ActualArgumentsCountRegister();
topmost_script_having_context = CallApiCallbackGenericDescriptor::
TopmostScriptHavingContextRegister();
func_templ =
CallApiCallbackGenericDescriptor::FunctionTemplateInfoRegister();
break;
case CallApiCallbackMode::kOptimizedNoProfiling:
case CallApiCallbackMode::kOptimized:
// Caller context is always equal to current context because we don't
// inline Api calls cross-context.
topmost_script_having_context = kContextRegister;
api_function_address =
CallApiCallbackOptimizedDescriptor::ApiFunctionAddressRegister();
argc = CallApiCallbackOptimizedDescriptor::ActualArgumentsCountRegister();
func_templ =
CallApiCallbackOptimizedDescriptor::FunctionTemplateInfoRegister();
break;
}
DCHECK(!AreAliased(api_function_address, topmost_script_having_context, argc,
func_templ, scratch));
using FCA = FunctionCallbackArguments;
using ER = ExternalReference;
using FC = ApiCallbackExitFrameConstants;
static_assert(FCA::kArgsLength == 6);
static_assert(FCA::kNewTargetIndex == 5);
static_assert(FCA::kTargetIndex == 4);
static_assert(FCA::kReturnValueIndex == 3);
static_assert(FCA::kContextIndex == 2);
static_assert(FCA::kIsolateIndex == 1);
static_assert(FCA::kUnusedIndex == 0);
// Set up FunctionCallbackInfo's implicit_args on the stack as follows:
//
// Target state:
// sp[1 * kSystemPointerSize]: kUnused <= FCA::implicit_args_
// sp[2 * kSystemPointerSize]: kIsolate
// sp[3 * kSystemPointerSize]: kContext
// sp[4 * kSystemPointerSize]: undefined (kReturnValue)
// sp[5 * kSystemPointerSize]: kTarget
// sp[6 * kSystemPointerSize]: undefined (kNewTarget)
// Existing state:
// sp[7 * kSystemPointerSize]: <= FCA:::values_
__ StoreRootRelative(IsolateData::topmost_script_having_context_offset(),
topmost_script_having_context);
if (mode == CallApiCallbackMode::kGeneric) {
api_function_address = ReassignRegister(topmost_script_having_context);
}
// Reserve space on the stack.
__ lay(sp, MemOperand(sp, -(FCA::kArgsLength * kSystemPointerSize)));
// kIsolate.
__ Move(scratch, ER::isolate_address());
__ StoreU64(scratch, MemOperand(sp, FCA::kIsolateIndex * kSystemPointerSize));
// kContext
__ StoreU64(cp, MemOperand(sp, FCA::kContextIndex * kSystemPointerSize));
// kReturnValue.
__ LoadRoot(scratch, RootIndex::kUndefinedValue);
__ StoreU64(scratch,
MemOperand(sp, FCA::kReturnValueIndex * kSystemPointerSize));
// kTarget.
__ StoreU64(func_templ,
MemOperand(sp, FCA::kTargetIndex * kSystemPointerSize));
// kNewTarget.
__ StoreU64(scratch,
MemOperand(sp, FCA::kNewTargetIndex * kSystemPointerSize));
// kUnused.
__ StoreU64(scratch, MemOperand(sp, FCA::kUnusedIndex * kSystemPointerSize));
FrameScope frame_scope(masm, StackFrame::MANUAL);
if (mode == CallApiCallbackMode::kGeneric) {
__ LoadU64(
api_function_address,
FieldMemOperand(func_templ,
FunctionTemplateInfo::kMaybeRedirectedCallbackOffset));
}
__ EnterExitFrame(scratch, FC::getExtraSlotsCountFrom<ExitFrameConstants>(),
StackFrame::API_CALLBACK_EXIT);
MemOperand argc_operand = MemOperand(fp, FC::kFCIArgcOffset);
{
ASM_CODE_COMMENT_STRING(masm, "Initialize v8::FunctionCallbackInfo");
// FunctionCallbackInfo::length_.
// TODO(ishell): pass JSParameterCount(argc) to simplify things on the
// caller end.
__ StoreU64(argc, argc_operand);
// FunctionCallbackInfo::implicit_args_.
__ AddS64(scratch, fp, Operand(FC::kImplicitArgsArrayOffset));
__ StoreU64(scratch, MemOperand(fp, FC::kFCIImplicitArgsOffset));
// FunctionCallbackInfo::values_ (points at JS arguments on the stack).
__ AddS64(scratch, fp, Operand(FC::kFirstArgumentOffset));
__ StoreU64(scratch, MemOperand(fp, FC::kFCIValuesOffset));
}
__ RecordComment("v8::FunctionCallback's argument.");
__ AddS64(function_callback_info_arg, fp,
Operand(FC::kFunctionCallbackInfoOffset));
DCHECK(!AreAliased(api_function_address, function_callback_info_arg));
ExternalReference thunk_ref = ER::invoke_function_callback(mode);
Register no_thunk_arg = no_reg;
MemOperand return_value_operand = MemOperand(fp, FC::kReturnValueOffset);
static constexpr int kSlotsToDropOnReturn =
FC::kFunctionCallbackInfoArgsLength + kJSArgcReceiverSlots;
const bool with_profiling =
mode != CallApiCallbackMode::kOptimizedNoProfiling;
CallApiFunctionAndReturn(masm, with_profiling, api_function_address,
thunk_ref, no_thunk_arg, kSlotsToDropOnReturn,
&argc_operand, return_value_operand);
}
void Builtins::Generate_CallApiGetter(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- cp : context
// -- r3 : receiver
// -- r5 : accessor info
// -- r2 : holder
// -----------------------------------
// Build v8::PropertyCallbackInfo::args_ array on the stack and push property
// name below the exit frame to make GC aware of them.
using PCA = PropertyCallbackArguments;
using ER = ExternalReference;
using FC = ApiAccessorExitFrameConstants;
static_assert(PCA::kPropertyKeyIndex == 0);
static_assert(PCA::kShouldThrowOnErrorIndex == 1);
static_assert(PCA::kHolderIndex == 2);
static_assert(PCA::kIsolateIndex == 3);
static_assert(PCA::kHolderV2Index == 4);
static_assert(PCA::kReturnValueIndex == 5);
static_assert(PCA::kDataIndex == 6);
static_assert(PCA::kThisIndex == 7);
static_assert(PCA::kArgsLength == 8);
// Set up v8::PropertyCallbackInfo's (PCI) args_ on the stack as follows:
// Target state:
// sp[0 * kSystemPointerSize]: name <= PCI::args_
// sp[1 * kSystemPointerSize]: kShouldThrowOnErrorIndex
// sp[2 * kSystemPointerSize]: kHolderIndex
// sp[3 * kSystemPointerSize]: kIsolateIndex
// sp[4 * kSystemPointerSize]: kHolderV2Index
// sp[5 * kSystemPointerSize]: kReturnValueIndex
// sp[6 * kSystemPointerSize]: kDataIndex
// sp[7 * kSystemPointerSize]: kThisIndex / receiver
Register name_arg = kCArgRegs[0];
Register property_callback_info_arg = kCArgRegs[1];
Register api_function_address = r4;
Register receiver = ApiGetterDescriptor::ReceiverRegister();
Register holder = ApiGetterDescriptor::HolderRegister();
Register callback = ApiGetterDescriptor::CallbackRegister();
Register scratch = r6;
Register smi_zero = r7;
DCHECK(!AreAliased(receiver, holder, callback, scratch, smi_zero));
__ LoadTaggedField(scratch,
FieldMemOperand(callback, AccessorInfo::kDataOffset), r1);
__ Push(receiver, scratch);
__ LoadRoot(scratch, RootIndex::kUndefinedValue);
__ Move(smi_zero, Smi::zero());
__ Push(scratch, smi_zero); // kReturnValueIndex, kHolderV2Index
__ Move(scratch, ER::isolate_address());
__ Push(scratch, holder);
__ LoadTaggedField(name_arg,
FieldMemOperand(callback, AccessorInfo::kNameOffset), r1);
static_assert(kDontThrow == 0);
__ Push(smi_zero, name_arg); // should_throw_on_error -> kDontThrow, name
__ RecordComment("Load api_function_address");
__ LoadU64(
api_function_address,
FieldMemOperand(callback, AccessorInfo::kMaybeRedirectedGetterOffset));
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(scratch, FC::getExtraSlotsCountFrom<ExitFrameConstants>(),
StackFrame::API_ACCESSOR_EXIT);
__ RecordComment("Create v8::PropertyCallbackInfo object on the stack.");
// property_callback_info_arg = v8::PropertyCallbackInfo&
__ AddS64(property_callback_info_arg, fp, Operand(FC::kArgsArrayOffset));
DCHECK(!AreAliased(api_function_address, property_callback_info_arg, name_arg,
callback, scratch));
#ifdef V8_ENABLE_DIRECT_HANDLE
// name_arg = Local<Name>(name), name value was pushed to GC-ed stack space.
// |name_arg| is already initialized above.
#else
// name_arg = Local<Name>(&name), which is &args_array[kPropertyKeyIndex].
static_assert(PCA::kPropertyKeyIndex == 0);
__ mov(name_arg, property_callback_info_arg);
#endif
ExternalReference thunk_ref = ER::invoke_accessor_getter_callback();
// Pass AccessorInfo to thunk wrapper in case profiler or side-effect
// checking is enabled.
Register thunk_arg = callback;
MemOperand return_value_operand = MemOperand(fp, FC::kReturnValueOffset);
static constexpr int kSlotsToDropOnReturn =
FC::kPropertyCallbackInfoArgsLength;
MemOperand* const kUseStackSpaceConstant = nullptr;
const bool with_profiling = true;
CallApiFunctionAndReturn(masm, with_profiling, api_function_address,
thunk_ref, thunk_arg, kSlotsToDropOnReturn,
kUseStackSpaceConstant, return_value_operand);
}
void Builtins::Generate_DirectCEntry(MacroAssembler* masm) {
// Unused.
__ stop();
}
namespace {
// This code tries to be close to ia32 code so that any changes can be
// easily ported.
void Generate_DeoptimizationEntry(MacroAssembler* masm,
DeoptimizeKind deopt_kind) {
Isolate* isolate = masm->isolate();
// Save all the registers onto the stack
const int kNumberOfRegisters = Register::kNumRegisters;
RegList restored_regs = kJSCallerSaved | kCalleeSaved;
const int kDoubleRegsSize = kDoubleSize * DoubleRegister::kNumRegisters;
// Save all double registers before messing with them.
__ lay(sp, MemOperand(sp, -kDoubleRegsSize));
const RegisterConfiguration* config = RegisterConfiguration::Default();
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
int code = config->GetAllocatableDoubleCode(i);
const DoubleRegister dreg = DoubleRegister::from_code(code);
int offset = code * kDoubleSize;
__ StoreF64(dreg, MemOperand(sp, offset));
}
// Push all GPRs onto the stack
__ lay(sp, MemOperand(sp, -kNumberOfRegisters * kSystemPointerSize));
__ StoreMultipleP(r0, sp, MemOperand(sp)); // Save all 16 registers
__ Move(r1, ExternalReference::Create(IsolateAddressId::kCEntryFPAddress,
isolate));
__ StoreU64(fp, MemOperand(r1));
static constexpr int kSavedRegistersAreaSize =
(kNumberOfRegisters * kSystemPointerSize) + kDoubleRegsSize;
// Get the address of the location in the code object (r5)(return
// address for lazy deoptimization) and compute the fp-to-sp delta in
// register r6.
__ mov(r4, r14);
__ la(r5, MemOperand(sp, kSavedRegistersAreaSize));
__ SubS64(r5, fp, r5);
// Allocate a new deoptimizer object.
// Pass six arguments in r2 to r7.
__ PrepareCallCFunction(5, r7);
__ mov(r2, Operand::Zero());
Label context_check;
__ LoadU64(r3,
MemOperand(fp, CommonFrameConstants::kContextOrFrameTypeOffset));
__ JumpIfSmi(r3, &context_check);
__ LoadU64(r2, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
__ bind(&context_check);
__ mov(r3, Operand(static_cast<int>(deopt_kind)));
// r4: code address or 0 already loaded.
// r5: Fp-to-sp delta already loaded.
// Parm6: isolate is passed on the stack.
__ Move(r6, ExternalReference::isolate_address());
__ StoreU64(r6,
MemOperand(sp, kStackFrameExtraParamSlot * kSystemPointerSize));
// Call Deoptimizer::New().
{
AllowExternalCallThatCantCauseGC scope(masm);
__ CallCFunction(ExternalReference::new_deoptimizer_function(), 5);
}
// Preserve "deoptimizer" object in register r2 and get the input
// frame descriptor pointer to r3 (deoptimizer->input_);
__ LoadU64(r3, MemOperand(r2, Deoptimizer::input_offset()));
// Copy core registers into FrameDescription::registers_[kNumRegisters].
// DCHECK_EQ(Register::kNumRegisters, kNumberOfRegisters);
// __ mvc(MemOperand(r3, FrameDescription::registers_offset()),
// MemOperand(sp), kNumberOfRegisters * kSystemPointerSize);
// Copy core registers into FrameDescription::registers_[kNumRegisters].
// TODO(john.yan): optimize the following code by using mvc instruction
DCHECK_EQ(Register::kNumRegisters, kNumberOfRegisters);
for (int i = 0; i < kNumberOfRegisters; i++) {
int offset =
(i * kSystemPointerSize) + FrameDescription::registers_offset();
__ LoadU64(r4, MemOperand(sp, i * kSystemPointerSize));
__ StoreU64(r4, MemOperand(r3, offset));
}
int simd128_regs_offset = FrameDescription::simd128_registers_offset();
// Copy double registers to
// double_registers_[DoubleRegister::kNumRegisters]
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
int code = config->GetAllocatableDoubleCode(i);
int dst_offset = code * kSimd128Size + simd128_regs_offset;
int src_offset =
code * kDoubleSize + kNumberOfRegisters * kSystemPointerSize;
// TODO(joransiu): MVC opportunity
__ LoadF64(d0, MemOperand(sp, src_offset));
__ StoreF64(d0, MemOperand(r3, dst_offset));
}
// Mark the stack as not iterable for the CPU profiler which won't be able to
// walk the stack without the return address.
{
UseScratchRegisterScope temps(masm);
Register is_iterable = temps.Acquire();
Register zero = r6;
__ LoadIsolateField(is_iterable, IsolateFieldId::kStackIsIterable);
__ lhi(zero, Operand(0));
__ StoreU8(zero, MemOperand(is_iterable));
}
// Remove the saved registers from the stack.
__ la(sp, MemOperand(sp, kSavedRegistersAreaSize));
// Compute a pointer to the unwinding limit in register r4; that is
// the first stack slot not part of the input frame.
__ LoadU64(r4, MemOperand(r3, FrameDescription::frame_size_offset()));
__ AddS64(r4, sp);
// Unwind the stack down to - but not including - the unwinding
// limit and copy the contents of the activation frame to the input
// frame description.
__ la(r5, MemOperand(r3, FrameDescription::frame_content_offset()));
Label pop_loop;
Label pop_loop_header;
__ b(&pop_loop_header, Label::kNear);
__ bind(&pop_loop);
__ pop(r6);
__ StoreU64(r6, MemOperand(r5, 0));
__ la(r5, MemOperand(r5, kSystemPointerSize));
__ bind(&pop_loop_header);
__ CmpS64(r4, sp);
__ bne(&pop_loop);
// Compute the output frame in the deoptimizer.
__ push(r2); // Preserve deoptimizer object across call.
// r2: deoptimizer object; r3: scratch.
__ PrepareCallCFunction(1, r3);
// Call Deoptimizer::ComputeOutputFrames().
{
AllowExternalCallThatCantCauseGC scope(masm);
__ CallCFunction(ExternalReference::compute_output_frames_function(), 1);
}
__ pop(r2); // Restore deoptimizer object (class Deoptimizer).
__ LoadU64(sp, MemOperand(r2, Deoptimizer::caller_frame_top_offset()));
// Replace the current (input) frame with the output frames.
Label outer_push_loop, inner_push_loop, outer_loop_header, inner_loop_header;
// Outer loop state: r6 = current "FrameDescription** output_",
// r3 = one past the last FrameDescription**.
__ LoadU32(r3, MemOperand(r2, Deoptimizer::output_count_offset()));
__ LoadU64(r6,
MemOperand(r2, Deoptimizer::output_offset())); // r6 is output_.
__ ShiftLeftU64(r3, r3, Operand(kSystemPointerSizeLog2));
__ AddS64(r3, r6, r3);
__ b(&outer_loop_header, Label::kNear);
__ bind(&outer_push_loop);
// Inner loop state: r4 = current FrameDescription*, r5 = loop index.
__ LoadU64(r4, MemOperand(r6, 0)); // output_[ix]
__ LoadU64(r5, MemOperand(r4, FrameDescription::frame_size_offset()));
__ b(&inner_loop_header, Label::kNear);
__ bind(&inner_push_loop);
__ SubS64(r5, Operand(sizeof(intptr_t)));
__ AddS64(r8, r4, r5);
__ LoadU64(r8, MemOperand(r8, FrameDescription::frame_content_offset()));
__ push(r8);
__ bind(&inner_loop_header);
__ CmpS64(r5, Operand::Zero());
__ bne(&inner_push_loop); // test for gt?
__ AddS64(r6, r6, Operand(kSystemPointerSize));
__ bind(&outer_loop_header);
__ CmpS64(r6, r3);
__ blt(&outer_push_loop);
__ LoadU64(r3, MemOperand(r2, Deoptimizer::input_offset()));
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
int code = config->GetAllocatableDoubleCode(i);
const DoubleRegister dreg = DoubleRegister::from_code(code);
int src_offset = code * kSimd128Size + simd128_regs_offset;
__ ld(dreg, MemOperand(r3, src_offset));
}
// Push pc and continuation from the last output frame.
__ LoadU64(r8, MemOperand(r4, FrameDescription::pc_offset()));
__ push(r8);
__ LoadU64(r8, MemOperand(r4, FrameDescription::continuation_offset()));
__ push(r8);
// Restore the registers from the last output frame.
__ mov(r1, r4);
for (int i = kNumberOfRegisters - 1; i > 0; i--) {
int offset =
(i * kSystemPointerSize) + FrameDescription::registers_offset();
if ((restored_regs.bits() & (1 << i)) != 0) {
__ LoadU64(ToRegister(i), MemOperand(r1, offset));
}
}
{
UseScratchRegisterScope temps(masm);
Register is_iterable = temps.Acquire();
Register one = r6;
__ push(one); // Save the value from the output FrameDescription.
__ LoadIsolateField(is_iterable, IsolateFieldId::kStackIsIterable);
__ lhi(one, Operand(1));
__ StoreU8(one, MemOperand(is_iterable));
__ pop(one); // Restore the value from the output FrameDescription.
}
{
__ pop(ip); // get continuation, leave pc on stack
__ pop(r14);
Label end;
__ CmpU64(ip, Operand::Zero());
__ beq(&end);
__ Jump(ip);
__ bind(&end);
__ Ret();
}
__ stop();
}
} // namespace
void Builtins::Generate_DeoptimizationEntry_Eager(MacroAssembler* masm) {
Generate_DeoptimizationEntry(masm, DeoptimizeKind::kEager);
}
void Builtins::Generate_DeoptimizationEntry_Lazy(MacroAssembler* masm) {
Generate_DeoptimizationEntry(masm, DeoptimizeKind::kLazy);
}
void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
using D = OnStackReplacementDescriptor;
static_assert(D::kParameterCount == 2);
OnStackReplacement(masm, OsrSourceTier::kInterpreter,
D::MaybeTargetCodeRegister(),
D::ExpectedParameterCountRegister());
}
void Builtins::Generate_BaselineOnStackReplacement(MacroAssembler* masm) {
using D = OnStackReplacementDescriptor;
static_assert(D::kParameterCount == 2);
__ LoadU64(kContextRegister,
MemOperand(fp, BaselineFrameConstants::kContextOffset));
OnStackReplacement(masm, OsrSourceTier::kBaseline,
D::MaybeTargetCodeRegister(),
D::ExpectedParameterCountRegister());
}
void Builtins::Generate_RestartFrameTrampoline(MacroAssembler* masm) {
// Frame is being dropped:
// - Look up current function on the frame.
// - Leave the frame.
// - Restart the frame by calling the function.
__ LoadU64(r3, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
__ LoadU64(r2, MemOperand(fp, StandardFrameConstants::kArgCOffset));
__ LeaveFrame(StackFrame::INTERPRETED);
// The arguments are already in the stack (including any necessary padding),
// we should not try to massage the arguments again.
__ mov(r4, Operand(kDontAdaptArgumentsSentinel));
__ InvokeFunction(r3, r4, r2, InvokeType::kJump);
}
#undef __
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_S390X