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// Copyright 2012 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_X64
#include "src/api/api-arguments.h"
#include "src/base/adapters.h"
#include "src/codegen/code-factory.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames.h"
#include "src/logging/counters.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/heap/heap-inl.h"
#include "src/objects/cell.h"
#include "src/objects/debug-objects.h"
#include "src/objects/foreign.h"
#include "src/objects/heap-number.h"
#include "src/objects/js-generator.h"
#include "src/objects/objects-inl.h"
#include "src/objects/smi.h"
#include "src/wasm/wasm-linkage.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm, Address address) {
__ LoadAddress(kJavaScriptCallExtraArg1Register,
ExternalReference::Create(address));
__ Jump(BUILTIN_CODE(masm->isolate(), AdaptorWithBuiltinExitFrame),
RelocInfo::CODE_TARGET);
}
static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
Runtime::FunctionId function_id) {
// ----------- S t a t e -------------
// -- rdx : new target (preserved for callee)
// -- rdi : target function (preserved for callee)
// -----------------------------------
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Push a copy of the target function and the new target.
__ Push(rdi);
__ Push(rdx);
// Function is also the parameter to the runtime call.
__ Push(rdi);
__ CallRuntime(function_id, 1);
__ movq(rcx, rax);
// Restore target function and new target.
__ Pop(rdx);
__ Pop(rdi);
}
static_assert(kJavaScriptCallCodeStartRegister == rcx, "ABI mismatch");
__ JumpCodeObject(rcx);
}
namespace {
Operand RealStackLimitAsOperand(MacroAssembler* masm) {
DCHECK(masm->root_array_available());
Isolate* isolate = masm->isolate();
ExternalReference limit = ExternalReference::address_of_real_jslimit(isolate);
DCHECK(TurboAssembler::IsAddressableThroughRootRegister(isolate, limit));
intptr_t offset =
TurboAssembler::RootRegisterOffsetForExternalReference(isolate, limit);
CHECK(is_int32(offset));
return Operand(kRootRegister, static_cast<int32_t>(offset));
}
void Generate_StackOverflowCheck(
MacroAssembler* masm, Register num_args, Register scratch,
Label* stack_overflow,
Label::Distance stack_overflow_distance = Label::kFar) {
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
__ movq(kScratchRegister, RealStackLimitAsOperand(masm));
__ movq(scratch, rsp);
// Make scratch the space we have left. The stack might already be overflowed
// here which will cause scratch to become negative.
__ subq(scratch, kScratchRegister);
__ sarq(scratch, Immediate(kSystemPointerSizeLog2));
// Check if the arguments will overflow the stack.
__ cmpq(scratch, num_args);
// Signed comparison.
__ j(less_equal, stack_overflow, stack_overflow_distance);
}
void Generate_JSBuiltinsConstructStubHelper(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax: number of arguments
// -- rdi: constructor function
// -- rdx: new target
// -- rsi: context
// -----------------------------------
Label stack_overflow;
Generate_StackOverflowCheck(masm, rax, rcx, &stack_overflow, Label::kFar);
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ SmiTag(rcx, rax);
__ Push(rsi);
__ Push(rcx);
// The receiver for the builtin/api call.
__ PushRoot(RootIndex::kTheHoleValue);
// Set up pointer to last argument.
__ leaq(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset));
// Copy arguments and receiver to the expression stack.
Label loop, entry;
__ movq(rcx, rax);
// ----------- S t a t e -------------
// -- rax: number of arguments (untagged)
// -- rdi: constructor function
// -- rdx: new target
// -- rbx: pointer to last argument
// -- rcx: counter
// -- sp[0*kSystemPointerSize]: the hole (receiver)
// -- sp[1*kSystemPointerSize]: number of arguments (tagged)
// -- sp[2*kSystemPointerSize]: context
// -----------------------------------
__ jmp(&entry);
__ bind(&loop);
__ Push(Operand(rbx, rcx, times_system_pointer_size, 0));
__ bind(&entry);
__ decq(rcx);
__ j(greater_equal, &loop, Label::kNear);
// Call the function.
// rax: number of arguments (untagged)
// rdi: constructor function
// rdx: new target
ParameterCount actual(rax);
__ InvokeFunction(rdi, rdx, actual, CALL_FUNCTION);
// Restore context from the frame.
__ movq(rsi, Operand(rbp, ConstructFrameConstants::kContextOffset));
// Restore smi-tagged arguments count from the frame.
__ movq(rbx, Operand(rbp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
__ PopReturnAddressTo(rcx);
SmiIndex index = masm->SmiToIndex(rbx, rbx, kSystemPointerSizeLog2);
__ leaq(rsp, Operand(rsp, index.reg, index.scale, 1 * kSystemPointerSize));
__ PushReturnAddressFrom(rcx);
__ ret(0);
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ int3(); // This should be unreachable.
}
}
} // namespace
// The construct stub for ES5 constructor functions and ES6 class constructors.
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax: number of arguments (untagged)
// -- rdi: constructor function
// -- rdx: new target
// -- rsi: context
// -- sp[...]: constructor arguments
// -----------------------------------
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
Label post_instantiation_deopt_entry, not_create_implicit_receiver;
// Preserve the incoming parameters on the stack.
__ SmiTag(rcx, rax);
__ Push(rsi);
__ Push(rcx);
__ Push(rdi);
__ PushRoot(RootIndex::kTheHoleValue);
__ Push(rdx);
// ----------- S t a t e -------------
// -- sp[0*kSystemPointerSize]: new target
// -- sp[1*kSystemPointerSize]: padding
// -- rdi and sp[2*kSystemPointerSize]: constructor function
// -- sp[3*kSystemPointerSize]: argument count
// -- sp[4*kSystemPointerSize]: context
// -----------------------------------
__ LoadTaggedPointerField(
rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ movl(rbx, FieldOperand(rbx, SharedFunctionInfo::kFlagsOffset));
__ DecodeField<SharedFunctionInfo::FunctionKindBits>(rbx);
__ JumpIfIsInRange(rbx, kDefaultDerivedConstructor, kDerivedConstructor,
¬_create_implicit_receiver, Label::kNear);
// If not derived class constructor: Allocate the new receiver object.
__ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1);
__ Call(BUILTIN_CODE(masm->isolate(), FastNewObject),
RelocInfo::CODE_TARGET);
__ jmp(&post_instantiation_deopt_entry, Label::kNear);
// Else: use TheHoleValue as receiver for constructor call
__ bind(¬_create_implicit_receiver);
__ LoadRoot(rax, RootIndex::kTheHoleValue);
// ----------- S t a t e -------------
// -- rax implicit 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 (tagged)
// -- 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(rdx);
// Push the allocated receiver to the stack. We need two copies
// because we may have to return the original one and the calling
// conventions dictate that the called function pops the receiver.
__ Push(rax);
__ Push(rax);
// ----------- S t a t e -------------
// -- 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 (tagged)
// -- sp[5*kSystemPointerSize] context
// -----------------------------------
// Restore constructor function and argument count.
__ movq(rdi, Operand(rbp, ConstructFrameConstants::kConstructorOffset));
__ SmiUntag(rax, Operand(rbp, ConstructFrameConstants::kLengthOffset));
// Set up pointer to last argument.
__ leaq(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset));
// Check if we have enough stack space to push all arguments.
// Argument count in rax. Clobbers rcx.
Label enough_stack_space, stack_overflow;
Generate_StackOverflowCheck(masm, rax, rcx, &stack_overflow, Label::kNear);
__ jmp(&enough_stack_space, Label::kNear);
__ bind(&stack_overflow);
// Restore context from the frame.
__ movq(rsi, Operand(rbp, ConstructFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kThrowStackOverflow);
// This should be unreachable.
__ int3();
__ bind(&enough_stack_space);
// Copy arguments and receiver to the expression stack.
Label loop, entry;
__ movq(rcx, rax);
// ----------- S t a t e -------------
// -- rax: number of arguments (untagged)
// -- rdx: new target
// -- rbx: pointer to last argument
// -- rcx: counter (tagged)
// -- sp[0*kSystemPointerSize]: implicit receiver
// -- sp[1*kSystemPointerSize]: implicit receiver
// -- sp[2*kSystemPointerSize]: padding
// -- rdi and sp[3*kSystemPointerSize]: constructor function
// -- sp[4*kSystemPointerSize]: number of arguments (tagged)
// -- sp[5*kSystemPointerSize]: context
// -----------------------------------
__ jmp(&entry, Label::kNear);
__ bind(&loop);
__ Push(Operand(rbx, rcx, times_system_pointer_size, 0));
__ bind(&entry);
__ decq(rcx);
__ j(greater_equal, &loop, Label::kNear);
// Call the function.
ParameterCount actual(rax);
__ InvokeFunction(rdi, rdx, actual, CALL_FUNCTION);
// ----------- S t a t e -------------
// -- rax constructor result
// -- sp[0*kSystemPointerSize] implicit receiver
// -- sp[1*kSystemPointerSize] padding
// -- sp[2*kSystemPointerSize] constructor function
// -- sp[3*kSystemPointerSize] number of arguments
// -- sp[4*kSystemPointerSize] context
// -----------------------------------
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetConstructStubInvokeDeoptPCOffset(
masm->pc_offset());
// Restore context from the frame.
__ movq(rsi, Operand(rbp, ConstructFrameConstants::kContextOffset));
// If the result is an object (in the ECMA sense), we should get rid
// of the receiver and use the result; see ECMA-262 section 13.2.2-7
// on page 74.
Label use_receiver, do_throw, leave_frame;
// If the result is undefined, we jump out to using the implicit receiver.
__ JumpIfRoot(rax, RootIndex::kUndefinedValue, &use_receiver, Label::kNear);
// Otherwise we do a smi check and fall through to check if the return value
// is a valid receiver.
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(rax, &use_receiver, Label::kNear);
// 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);
__ CmpObjectType(rax, FIRST_JS_RECEIVER_TYPE, rcx);
__ j(above_equal, &leave_frame, Label::kNear);
__ jmp(&use_receiver, Label::kNear);
__ bind(&do_throw);
__ CallRuntime(Runtime::kThrowConstructorReturnedNonObject);
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ movq(rax, Operand(rsp, 0 * kSystemPointerSize));
__ JumpIfRoot(rax, RootIndex::kTheHoleValue, &do_throw, Label::kNear);
__ bind(&leave_frame);
// Restore the arguments count.
__ movq(rbx, Operand(rbp, ConstructFrameConstants::kLengthOffset));
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
__ PopReturnAddressTo(rcx);
SmiIndex index = masm->SmiToIndex(rbx, rbx, kSystemPointerSizeLog2);
__ leaq(rsp, Operand(rsp, index.reg, index.scale, 1 * kSystemPointerSize));
__ PushReturnAddressFrom(rcx);
__ ret(0);
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSBuiltinsConstructStubHelper(masm);
}
void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(rdi);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable);
}
namespace {
// Called with the native C calling convention. The corresponding function
// signature is either:
// using JSEntryFunction = GeneratedCode<Address(
// Address root_register_value, Address new_target, Address target,
// Address receiver, intptr_t argc, Address** argv)>;
// or
// using JSEntryFunction = GeneratedCode<Address(
// Address root_register_value, MicrotaskQueue* microtask_queue)>;
void Generate_JSEntryVariant(MacroAssembler* masm, StackFrame::Type type,
Builtins::Name entry_trampoline) {
Label invoke, handler_entry, exit;
Label not_outermost_js, not_outermost_js_2;
{ // NOLINT. Scope block confuses linter.
NoRootArrayScope uninitialized_root_register(masm);
// Set up frame.
__ pushq(rbp);
__ movq(rbp, rsp);
// Push the stack frame type.
__ Push(Immediate(StackFrame::TypeToMarker(type)));
// Reserve a slot for the context. It is filled after the root register has
// been set up.
__ AllocateStackSpace(kSystemPointerSize);
// Save callee-saved registers (X64/X32/Win64 calling conventions).
__ pushq(r12);
__ pushq(r13);
__ pushq(r14);
__ pushq(r15);
#ifdef _WIN64
__ pushq(rdi); // Only callee save in Win64 ABI, argument in AMD64 ABI.
__ pushq(rsi); // Only callee save in Win64 ABI, argument in AMD64 ABI.
#endif
__ pushq(rbx);
#ifdef _WIN64
// On Win64 XMM6-XMM15 are callee-save.
__ AllocateStackSpace(EntryFrameConstants::kXMMRegistersBlockSize);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 0), xmm6);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 1), xmm7);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 2), xmm8);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 3), xmm9);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 4), xmm10);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 5), xmm11);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 6), xmm12);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 7), xmm13);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 8), xmm14);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 9), xmm15);
STATIC_ASSERT(EntryFrameConstants::kCalleeSaveXMMRegisters == 10);
STATIC_ASSERT(EntryFrameConstants::kXMMRegistersBlockSize ==
EntryFrameConstants::kXMMRegisterSize *
EntryFrameConstants::kCalleeSaveXMMRegisters);
#endif
// Initialize the root register.
// C calling convention. The first argument is passed in arg_reg_1.
__ movq(kRootRegister, arg_reg_1);
}
// Save copies of the top frame descriptor on the stack.
ExternalReference c_entry_fp = ExternalReference::Create(
IsolateAddressId::kCEntryFPAddress, masm->isolate());
{
Operand c_entry_fp_operand = masm->ExternalReferenceAsOperand(c_entry_fp);
__ Push(c_entry_fp_operand);
}
// Store the context address in the previously-reserved slot.
ExternalReference context_address = ExternalReference::Create(
IsolateAddressId::kContextAddress, masm->isolate());
__ Load(kScratchRegister, context_address);
static constexpr int kOffsetToContextSlot = -2 * kSystemPointerSize;
__ movq(Operand(rbp, kOffsetToContextSlot), kScratchRegister);
// If this is the outermost JS call, set js_entry_sp value.
ExternalReference js_entry_sp = ExternalReference::Create(
IsolateAddressId::kJSEntrySPAddress, masm->isolate());
__ Load(rax, js_entry_sp);
__ testq(rax, rax);
__ j(not_zero, ¬_outermost_js);
__ Push(Immediate(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ movq(rax, rbp);
__ Store(js_entry_sp, rax);
Label cont;
__ jmp(&cont);
__ bind(¬_outermost_js);
__ Push(Immediate(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ jmp(&invoke);
__ bind(&handler_entry);
// Store the current pc as the handler offset. It's used later to create the
// handler table.
masm->isolate()->builtins()->SetJSEntryHandlerOffset(handler_entry.pos());
// Caught exception: Store result (exception) in the pending exception
// field in the JSEnv and return a failure sentinel.
ExternalReference pending_exception = ExternalReference::Create(
IsolateAddressId::kPendingExceptionAddress, masm->isolate());
__ Store(pending_exception, rax);
__ LoadRoot(rax, RootIndex::kException);
__ jmp(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
__ PushStackHandler();
// Invoke the function by calling through JS entry trampoline builtin and
// pop the faked function when we return.
Handle<Code> trampoline_code =
masm->isolate()->builtins()->builtin_handle(entry_trampoline);
__ Call(trampoline_code, RelocInfo::CODE_TARGET);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit);
// Check if the current stack frame is marked as the outermost JS frame.
__ Pop(rbx);
__ cmpq(rbx, Immediate(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ j(not_equal, ¬_outermost_js_2);
__ Move(kScratchRegister, js_entry_sp);
__ movq(Operand(kScratchRegister, 0), Immediate(0));
__ bind(¬_outermost_js_2);
// Restore the top frame descriptor from the stack.
{
Operand c_entry_fp_operand = masm->ExternalReferenceAsOperand(c_entry_fp);
__ Pop(c_entry_fp_operand);
}
// Restore callee-saved registers (X64 conventions).
#ifdef _WIN64
// On Win64 XMM6-XMM15 are callee-save
__ movdqu(xmm6, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 0));
__ movdqu(xmm7, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 1));
__ movdqu(xmm8, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 2));
__ movdqu(xmm9, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 3));
__ movdqu(xmm10, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 4));
__ movdqu(xmm11, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 5));
__ movdqu(xmm12, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 6));
__ movdqu(xmm13, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 7));
__ movdqu(xmm14, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 8));
__ movdqu(xmm15, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 9));
__ addq(rsp, Immediate(EntryFrameConstants::kXMMRegistersBlockSize));
#endif
__ popq(rbx);
#ifdef _WIN64
// Callee save on in Win64 ABI, arguments/volatile in AMD64 ABI.
__ popq(rsi);
__ popq(rdi);
#endif
__ popq(r15);
__ popq(r14);
__ popq(r13);
__ popq(r12);
__ addq(rsp, Immediate(2 * kSystemPointerSize)); // remove markers
// Restore frame pointer and return.
__ popq(rbp);
__ ret(0);
}
} // namespace
void Builtins::Generate_JSEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtins::kJSEntryTrampoline);
}
void Builtins::Generate_JSConstructEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::CONSTRUCT_ENTRY,
Builtins::kJSConstructEntryTrampoline);
}
void Builtins::Generate_JSRunMicrotasksEntry(MacroAssembler* masm) {
Generate_JSEntryVariant(masm, StackFrame::ENTRY,
Builtins::kRunMicrotasksTrampoline);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// Expects six C++ function parameters.
// - Address root_register_value
// - Address new_target (tagged Object pointer)
// - Address function (tagged JSFunction pointer)
// - Address receiver (tagged Object pointer)
// - intptr_t argc
// - Address** argv (pointer to array of tagged Object pointers)
// (see Handle::Invoke in execution.cc).
// Open a C++ scope for the FrameScope.
{
// Platform specific argument handling. After this, the stack contains
// an internal frame and the pushed function and receiver, and
// register rax and rbx holds the argument count and argument array,
// while rdi holds the function pointer, rsi the context, and rdx the
// new.target.
// MSVC parameters in:
// rcx : root_register_value
// rdx : new_target
// r8 : function
// r9 : receiver
// [rsp+0x20] : argc
// [rsp+0x28] : argv
//
// GCC parameters in:
// rdi : root_register_value
// rsi : new_target
// rdx : function
// rcx : receiver
// r8 : argc
// r9 : argv
__ movq(rdi, arg_reg_3);
__ Move(rdx, arg_reg_2);
// rdi : function
// rdx : new_target
// Clear the context before we push it when entering the internal frame.
__ Set(rsi, 0);
// Enter an internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
// Setup the context (we need to use the caller context from the isolate).
ExternalReference context_address = ExternalReference::Create(
IsolateAddressId::kContextAddress, masm->isolate());
__ movq(rsi, masm->ExternalReferenceAsOperand(context_address));
// Push the function and the receiver onto the stack.
__ Push(rdi);
__ Push(arg_reg_4);
#ifdef _WIN64
// Load the previous frame pointer to access C arguments on stack
__ movq(kScratchRegister, Operand(rbp, 0));
// Load the number of arguments and setup pointer to the arguments.
__ movq(rax, Operand(kScratchRegister, EntryFrameConstants::kArgcOffset));
__ movq(rbx, Operand(kScratchRegister, EntryFrameConstants::kArgvOffset));
#else // _WIN64
// Load the number of arguments and setup pointer to the arguments.
__ movq(rax, r8);
__ movq(rbx, r9);
#endif // _WIN64
// Current stack contents:
// [rsp + 2 * kSystemPointerSize ... ] : Internal frame
// [rsp + kSystemPointerSize] : function
// [rsp] : receiver
// Current register contents:
// rax : argc
// rbx : argv
// rsi : context
// rdi : function
// rdx : new.target
// Check if we have enough stack space to push all arguments.
// Argument count in rax. Clobbers rcx.
Label enough_stack_space, stack_overflow;
Generate_StackOverflowCheck(masm, rax, rcx, &stack_overflow, Label::kNear);
__ jmp(&enough_stack_space, Label::kNear);
__ bind(&stack_overflow);
__ CallRuntime(Runtime::kThrowStackOverflow);
// This should be unreachable.
__ int3();
__ bind(&enough_stack_space);
// Copy arguments to the stack in a loop.
// Register rbx points to array of pointers to handle locations.
// Push the values of these handles.
Label loop, entry;
__ Set(rcx, 0); // Set loop variable to 0.
__ jmp(&entry, Label::kNear);
__ bind(&loop);
__ movq(kScratchRegister, Operand(rbx, rcx, times_system_pointer_size, 0));
__ Push(Operand(kScratchRegister, 0)); // dereference handle
__ addq(rcx, Immediate(1));
__ bind(&entry);
__ cmpq(rcx, rax);
__ j(not_equal, &loop, Label::kNear);
// Invoke the builtin code.
Handle<Code> builtin = is_construct
? BUILTIN_CODE(masm->isolate(), Construct)
: masm->isolate()->builtins()->Call();
__ Call(builtin, RelocInfo::CODE_TARGET);
// Exit the internal frame. Notice that this also removes the empty
// context and the function left on the stack by the code
// invocation.
}
__ ret(0);
}
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) {
// arg_reg_2: microtask_queue
__ movq(RunMicrotasksDescriptor::MicrotaskQueueRegister(), arg_reg_2);
__ Jump(BUILTIN_CODE(masm->isolate(), RunMicrotasks), RelocInfo::CODE_TARGET);
}
static void GetSharedFunctionInfoBytecode(MacroAssembler* masm,
Register sfi_data,
Register scratch1) {
Label done;
__ CmpObjectType(sfi_data, INTERPRETER_DATA_TYPE, scratch1);
__ j(not_equal, &done, Label::kNear);
__ LoadTaggedPointerField(
sfi_data, FieldOperand(sfi_data, InterpreterData::kBytecodeArrayOffset));
__ bind(&done);
}
// static
void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : the value to pass to the generator
// -- rdx : the JSGeneratorObject to resume
// -- rsp[0] : return address
// -----------------------------------
__ AssertGeneratorObject(rdx);
// Store input value into generator object.
__ StoreTaggedField(
FieldOperand(rdx, JSGeneratorObject::kInputOrDebugPosOffset), rax);
__ RecordWriteField(rdx, JSGeneratorObject::kInputOrDebugPosOffset, rax, rcx,
kDontSaveFPRegs);
Register decompr_scratch1 = COMPRESS_POINTERS_BOOL ? r11 : no_reg;
Register decompr_scratch2 = COMPRESS_POINTERS_BOOL ? r12 : no_reg;
// Load suspended function and context.
__ LoadTaggedPointerField(
rdi, FieldOperand(rdx, JSGeneratorObject::kFunctionOffset));
__ LoadTaggedPointerField(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
// Flood function if we are stepping.
Label prepare_step_in_if_stepping, prepare_step_in_suspended_generator;
Label stepping_prepared;
ExternalReference debug_hook =
ExternalReference::debug_hook_on_function_call_address(masm->isolate());
Operand debug_hook_operand = masm->ExternalReferenceAsOperand(debug_hook);
__ cmpb(debug_hook_operand, Immediate(0));
__ j(not_equal, &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());
Operand debug_suspended_generator_operand =
masm->ExternalReferenceAsOperand(debug_suspended_generator);
__ cmpq(rdx, debug_suspended_generator_operand);
__ j(equal, &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;
__ cmpq(rsp, RealStackLimitAsOperand(masm));
__ j(below, &stack_overflow);
// Pop return address.
__ PopReturnAddressTo(rax);
// Push receiver.
__ PushTaggedPointerField(
FieldOperand(rdx, JSGeneratorObject::kReceiverOffset), decompr_scratch1);
// ----------- S t a t e -------------
// -- rax : return address
// -- rdx : the JSGeneratorObject to resume
// -- rdi : generator function
// -- rsi : generator context
// -- rsp[0] : generator receiver
// -----------------------------------
// Copy the function arguments from the generator object's register file.
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ movzxwq(
rcx, FieldOperand(rcx, SharedFunctionInfo::kFormalParameterCountOffset));
__ LoadTaggedPointerField(
rbx, FieldOperand(rdx, JSGeneratorObject::kParametersAndRegistersOffset));
{
Label done_loop, loop;
__ Set(r9, 0);
__ bind(&loop);
__ cmpl(r9, rcx);
__ j(greater_equal, &done_loop, Label::kNear);
__ PushTaggedAnyField(
FieldOperand(rbx, r9, times_tagged_size, FixedArray::kHeaderSize),
decompr_scratch1, decompr_scratch2);
__ addl(r9, Immediate(1));
__ jmp(&loop);
__ bind(&done_loop);
}
// Underlying function needs to have bytecode available.
if (FLAG_debug_code) {
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ LoadTaggedPointerField(
rcx, FieldOperand(rcx, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecode(masm, rcx, kScratchRegister);
__ CmpObjectType(rcx, BYTECODE_ARRAY_TYPE, rcx);
__ Assert(equal, AbortReason::kMissingBytecodeArray);
}
// Resume (Ignition/TurboFan) generator object.
{
__ PushReturnAddressFrom(rax);
__ LoadTaggedPointerField(
rax, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ movzxwq(rax, FieldOperand(
rax, 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.
static_assert(kJavaScriptCallCodeStartRegister == rcx, "ABI mismatch");
__ LoadTaggedPointerField(rcx, FieldOperand(rdi, JSFunction::kCodeOffset));
__ JumpCodeObject(rcx);
}
__ bind(&prepare_step_in_if_stepping);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(rdx);
__ Push(rdi);
// Push hole as receiver since we do not use it for stepping.
__ PushRoot(RootIndex::kTheHoleValue);
__ CallRuntime(Runtime::kDebugOnFunctionCall);
__ Pop(rdx);
__ LoadTaggedPointerField(
rdi, FieldOperand(rdx, JSGeneratorObject::kFunctionOffset));
}
__ jmp(&stepping_prepared);
__ bind(&prepare_step_in_suspended_generator);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(rdx);
__ CallRuntime(Runtime::kDebugPrepareStepInSuspendedGenerator);
__ Pop(rdx);
__ LoadTaggedPointerField(
rdi, FieldOperand(rdx, JSGeneratorObject::kFunctionOffset));
}
__ jmp(&stepping_prepared);
__ bind(&stack_overflow);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ int3(); // This should be unreachable.
}
}
// TODO(juliana): if we remove the code below then we don't need all
// the parameters.
static void ReplaceClosureCodeWithOptimizedCode(
MacroAssembler* masm, Register optimized_code, Register closure,
Register scratch1, Register scratch2, Register scratch3) {
// Store the optimized code in the closure.
__ StoreTaggedField(FieldOperand(closure, JSFunction::kCodeOffset),
optimized_code);
__ movq(scratch1, optimized_code); // Write barrier clobbers scratch1 below.
__ RecordWriteField(closure, JSFunction::kCodeOffset, scratch1, scratch2,
kDontSaveFPRegs, OMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
}
static void LeaveInterpreterFrame(MacroAssembler* masm, Register scratch1,
Register scratch2) {
Register args_count = scratch1;
Register return_pc = scratch2;
// Get the arguments + receiver count.
__ movq(args_count,
Operand(rbp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ movl(args_count,
FieldOperand(args_count, BytecodeArray::kParameterSizeOffset));
// Leave the frame (also dropping the register file).
__ leave();
// Drop receiver + arguments.
__ PopReturnAddressTo(return_pc);
__ addq(rsp, args_count);
__ PushReturnAddressFrom(return_pc);
}
// Tail-call |function_id| if |smi_entry| == |marker|
static void TailCallRuntimeIfMarkerEquals(MacroAssembler* masm,
Register smi_entry,
OptimizationMarker marker,
Runtime::FunctionId function_id) {
Label no_match;
__ SmiCompare(smi_entry, Smi::FromEnum(marker));
__ j(not_equal, &no_match);
GenerateTailCallToReturnedCode(masm, function_id);
__ bind(&no_match);
}
static void MaybeTailCallOptimizedCodeSlot(MacroAssembler* masm,
Register feedback_vector,
Register scratch1, Register scratch2,
Register scratch3) {
// ----------- S t a t e -------------
// -- rdx : new target (preserved for callee if needed, and caller)
// -- rdi : target function (preserved for callee if needed, and caller)
// -- feedback vector (preserved for caller if needed)
// -----------------------------------
DCHECK(!AreAliased(feedback_vector, rdx, rdi, scratch1, scratch2, scratch3));
Label optimized_code_slot_is_weak_ref, fallthrough;
Register closure = rdi;
Register optimized_code_entry = scratch1;
Register decompr_scratch = COMPRESS_POINTERS_BOOL ? scratch2 : no_reg;
__ LoadAnyTaggedField(
optimized_code_entry,
FieldOperand(feedback_vector,
FeedbackVector::kOptimizedCodeWeakOrSmiOffset),
decompr_scratch);
// Check if the code entry is a Smi. If yes, we interpret it as an
// optimisation marker. Otherwise, interpret it as a weak reference to a code
// object.
__ JumpIfNotSmi(optimized_code_entry, &optimized_code_slot_is_weak_ref);
{
// Optimized code slot is a Smi optimization marker.
// Fall through if no optimization trigger.
__ SmiCompare(optimized_code_entry,
Smi::FromEnum(OptimizationMarker::kNone));
__ j(equal, &fallthrough);
// TODO(v8:8394): The logging of first execution will break if
// feedback vectors are not allocated. We need to find a different way of
// logging these events if required.
TailCallRuntimeIfMarkerEquals(masm, optimized_code_entry,
OptimizationMarker::kLogFirstExecution,
Runtime::kFunctionFirstExecution);
TailCallRuntimeIfMarkerEquals(masm, optimized_code_entry,
OptimizationMarker::kCompileOptimized,
Runtime::kCompileOptimized_NotConcurrent);
TailCallRuntimeIfMarkerEquals(
masm, optimized_code_entry,
OptimizationMarker::kCompileOptimizedConcurrent,
Runtime::kCompileOptimized_Concurrent);
{
// Otherwise, the marker is InOptimizationQueue, so fall through hoping
// that an interrupt will eventually update the slot with optimized code.
if (FLAG_debug_code) {
__ SmiCompare(optimized_code_entry,
Smi::FromEnum(OptimizationMarker::kInOptimizationQueue));
__ Assert(equal, AbortReason::kExpectedOptimizationSentinel);
}
__ jmp(&fallthrough);
}
}
{
// Optimized code slot is a weak reference.
__ bind(&optimized_code_slot_is_weak_ref);
__ LoadWeakValue(optimized_code_entry, &fallthrough);
// Check if the optimized code is marked for deopt. If it is, call the
// runtime to clear it.
Label found_deoptimized_code;
__ LoadTaggedPointerField(
scratch2,
FieldOperand(optimized_code_entry, Code::kCodeDataContainerOffset));
__ testl(
FieldOperand(scratch2, CodeDataContainer::kKindSpecificFlagsOffset),
Immediate(1 << Code::kMarkedForDeoptimizationBit));
__ j(not_zero, &found_deoptimized_code);
// Optimized code is good, get it into the closure and link the closure into
// the optimized functions list, then tail call the optimized code.
// The feedback vector is no longer used, so re-use it as a scratch
// register.
ReplaceClosureCodeWithOptimizedCode(masm, optimized_code_entry, closure,
scratch2, scratch3, feedback_vector);
static_assert(kJavaScriptCallCodeStartRegister == rcx, "ABI mismatch");
__ Move(rcx, optimized_code_entry);
__ JumpCodeObject(rcx);
// Optimized code slot contains deoptimized code, evict it and re-enter the
// closure's code.
__ bind(&found_deoptimized_code);
GenerateTailCallToReturnedCode(masm, Runtime::kEvictOptimizedCodeSlot);
}
// Fall-through if the optimized code cell is clear and there is no
// optimization marker.
__ bind(&fallthrough);
}
// Advance the current bytecode offset. This simulates what all bytecode
// handlers do upon completion of the underlying operation. Will bail out to a
// label if the bytecode (without prefix) is a return bytecode.
static void AdvanceBytecodeOffsetOrReturn(MacroAssembler* masm,
Register bytecode_array,
Register bytecode_offset,
Register bytecode, Register scratch1,
Label* if_return) {
Register bytecode_size_table = scratch1;
DCHECK(!AreAliased(bytecode_array, bytecode_offset, bytecode_size_table,
bytecode));
__ Move(bytecode_size_table,
ExternalReference::bytecode_size_table_address());
// Check if the bytecode is a Wide or ExtraWide prefix bytecode.
Label process_bytecode, extra_wide;
STATIC_ASSERT(0 == static_cast<int>(interpreter::Bytecode::kWide));
STATIC_ASSERT(1 == static_cast<int>(interpreter::Bytecode::kExtraWide));
STATIC_ASSERT(2 == static_cast<int>(interpreter::Bytecode::kDebugBreakWide));
STATIC_ASSERT(3 ==
static_cast<int>(interpreter::Bytecode::kDebugBreakExtraWide));
__ cmpb(bytecode, Immediate(0x3));
__ j(above, &process_bytecode, Label::kNear);
__ testb(bytecode, Immediate(0x1));
__ j(not_equal, &extra_wide, Label::kNear);
// Load the next bytecode and update table to the wide scaled table.
__ incl(bytecode_offset);
__ movzxbq(bytecode, Operand(bytecode_array, bytecode_offset, times_1, 0));
__ addq(bytecode_size_table,
Immediate(kIntSize * interpreter::Bytecodes::kBytecodeCount));
__ jmp(&process_bytecode, Label::kNear);
__ bind(&extra_wide);
// Load the next bytecode and update table to the extra wide scaled table.
__ incl(bytecode_offset);
__ movzxbq(bytecode, Operand(bytecode_array, bytecode_offset, times_1, 0));
__ addq(bytecode_size_table,
Immediate(2 * kIntSize * interpreter::Bytecodes::kBytecodeCount));
__ bind(&process_bytecode);
// Bailout to the return label if this is a return bytecode.
#define JUMP_IF_EQUAL(NAME) \
__ cmpb(bytecode, \
Immediate(static_cast<int>(interpreter::Bytecode::k##NAME))); \
__ j(equal, if_return, Label::kFar);
RETURN_BYTECODE_LIST(JUMP_IF_EQUAL)
#undef JUMP_IF_EQUAL
// Otherwise, load the size of the current bytecode and advance the offset.
__ addl(bytecode_offset,
Operand(bytecode_size_table, bytecode, times_int_size, 0));
}
// Generate code for entering a JS function with the interpreter.
// On entry to the function the receiver and arguments have been pushed on the
// stack left to right. The actual argument count matches the formal parameter
// count expected by the function.
//
// The live registers are:
// o rdi: the JS function object being called
// o rdx: the incoming new target or generator object
// o rsi: our context
// o rbp: the caller's frame pointer
// o rsp: stack pointer (pointing to return address)
//
// The function builds an interpreter frame. See InterpreterFrameConstants in
// frames.h for its layout.
void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
Register closure = rdi;
Register feedback_vector = rbx;
// Get the bytecode array from the function object and load it into
// kInterpreterBytecodeArrayRegister.
__ LoadTaggedPointerField(
rax, FieldOperand(closure, JSFunction::kSharedFunctionInfoOffset));
__ LoadTaggedPointerField(
kInterpreterBytecodeArrayRegister,
FieldOperand(rax, SharedFunctionInfo::kFunctionDataOffset));
GetSharedFunctionInfoBytecode(masm, kInterpreterBytecodeArrayRegister,
kScratchRegister);
// The bytecode array could have been flushed from the shared function info,
// if so, call into CompileLazy.
Label compile_lazy;
__ CmpObjectType(kInterpreterBytecodeArrayRegister, BYTECODE_ARRAY_TYPE, rax);
__ j(not_equal, &compile_lazy);
// Load the feedback vector from the closure.
__ LoadTaggedPointerField(
feedback_vector, FieldOperand(closure, JSFunction::kFeedbackCellOffset));
__ LoadTaggedPointerField(feedback_vector,
FieldOperand(feedback_vector, Cell::kValueOffset));
Label push_stack_frame;
// Check if feedback vector is valid. If valid, check for optimized code
// and update invocation count. Otherwise, setup the stack frame.
__ LoadTaggedPointerField(
rcx, FieldOperand(feedback_vector, HeapObject::kMapOffset));
__ CmpInstanceType(rcx, FEEDBACK_VECTOR_TYPE);
__ j(not_equal, &push_stack_frame);
// Read off the optimized code slot in the feedback vector, and if there
// is optimized code or an optimization marker, call that instead.
MaybeTailCallOptimizedCodeSlot(masm, feedback_vector, rcx, r11, r15);
// Increment invocation count for the function.
__ incl(
FieldOperand(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).
__ bind(&push_stack_frame);
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ pushq(rbp); // Caller's frame pointer.
__ movq(rbp, rsp);
__ Push(rsi); // Callee's context.
__ Push(rdi); // Callee's JS function.
// Reset code age and the OSR arming. The OSR field and BytecodeAgeOffset are
// 8-bit fields next to each other, so we could just optimize by writing a
// 16-bit. These static asserts guard our assumption is valid.
STATIC_ASSERT(BytecodeArray::kBytecodeAgeOffset ==
BytecodeArray::kOsrNestingLevelOffset + kCharSize);
STATIC_ASSERT(BytecodeArray::kNoAgeBytecodeAge == 0);
__ movw(FieldOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kOsrNestingLevelOffset),
Immediate(0));
// Load initial bytecode offset.
__ movq(kInterpreterBytecodeOffsetRegister,
Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
// Push bytecode array and Smi tagged bytecode offset.
__ Push(kInterpreterBytecodeArrayRegister);
__ SmiTag(rcx, kInterpreterBytecodeOffsetRegister);
__ Push(rcx);
// Allocate the local and temporary register file on the stack.
{
// Load frame size from the BytecodeArray object.
__ movl(rcx, FieldOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kFrameSizeOffset));
// Do a stack check to ensure we don't go over the limit.
Label ok;
__ movq(rax, rsp);
__ subq(rax, rcx);
__ cmpq(rax, RealStackLimitAsOperand(masm));
__ j(above_equal, &ok, Label::kNear);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ bind(&ok);
// If ok, push undefined as the initial value for all register file entries.
Label loop_header;
Label loop_check;
__ LoadRoot(rax, RootIndex::kUndefinedValue);
__ j(always, &loop_check, Label::kNear);
__ bind(&loop_header);
// TODO(rmcilroy): Consider doing more than one push per loop iteration.
__ Push(rax);
// Continue loop if not done.
__ bind(&loop_check);
__ subq(rcx, Immediate(kSystemPointerSize));
__ j(greater_equal, &loop_header, Label::kNear);
}
// If the bytecode array has a valid incoming new target or generator object
// register, initialize it with incoming value which was passed in rdx.
Label no_incoming_new_target_or_generator_register;
__ movsxlq(
rax,
FieldOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kIncomingNewTargetOrGeneratorRegisterOffset));
__ testl(rax, rax);
__ j(zero, &no_incoming_new_target_or_generator_register, Label::kNear);
__ movq(Operand(rbp, rax, times_system_pointer_size, 0), rdx);
__ bind(&no_incoming_new_target_or_generator_register);
// Load accumulator with undefined.
__ LoadRoot(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
// Load the dispatch table into a register and dispatch to the bytecode
// handler at the current bytecode offset.
Label do_dispatch;
__ bind(&do_dispatch);
__ Move(
kInterpreterDispatchTableRegister,
ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
__ movzxbq(r11, Operand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, times_1, 0));
__ movq(kJavaScriptCallCodeStartRegister,
Operand(kInterpreterDispatchTableRegister, r11,
times_system_pointer_size, 0));
__ call(kJavaScriptCallCodeStartRegister);
masm->isolate()->heap()->SetInterpreterEntryReturnPCOffset(masm->pc_offset());
// Any returns to the entry trampoline are either due to the return bytecode
// or the interpreter tail calling a builtin and then a dispatch.
// Get bytecode array and bytecode offset from the stack frame.
__ movq(kInterpreterBytecodeArrayRegister,
Operand(rbp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ movq(kInterpreterBytecodeOffsetRegister,
Operand(rbp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister,
kInterpreterBytecodeOffsetRegister);
// Either return, or advance to the next bytecode and dispatch.
Label do_return;
__ movzxbq(rbx, Operand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, times_1, 0));
AdvanceBytecodeOffsetOrReturn(masm, kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, rbx, rcx,
&do_return);
__ jmp(&do_dispatch);
__ bind(&do_return);
// The return value is in rax.
LeaveInterpreterFrame(masm, rbx, rcx);
__ ret(0);
__ bind(&compile_lazy);
GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
__ int3(); // Should not return.
}
static void Generate_InterpreterPushArgs(MacroAssembler* masm,
Register num_args,
Register start_address,
Register scratch) {
// Find the address of the last argument.
__ Move(scratch, num_args);
__ shlq(scratch, Immediate(kSystemPointerSizeLog2));
__ negq(scratch);
__ addq(scratch, start_address);
// Push the arguments.
Label loop_header, loop_check;
__ j(always, &loop_check, Label::kNear);
__ bind(&loop_header);
__ Push(Operand(start_address, 0));
__ subq(start_address, Immediate(kSystemPointerSize));
__ bind(&loop_check);
__ cmpq(start_address, scratch);
__ j(greater, &loop_header, Label::kNear);
}
// static
void Builtins::Generate_InterpreterPushArgsThenCallImpl(
MacroAssembler* masm, ConvertReceiverMode receiver_mode,
InterpreterPushArgsMode mode) {
DCHECK(mode != InterpreterPushArgsMode::kArrayFunction);
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rbx : 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.
// -- rdi : the target to call (can be any Object).
// -----------------------------------
Label stack_overflow;
// Number of values to be pushed.
__ leal(rcx, Operand(rax, 1)); // Add one for receiver.
// Add a stack check before pushing arguments.
Generate_StackOverflowCheck(masm, rcx, rdx, &stack_overflow);
// Pop return address to allow tail-call after pushing arguments.
__ PopReturnAddressTo(kScratchRegister);
// Push "undefined" as the receiver arg if we need to.
if (receiver_mode == ConvertReceiverMode::kNullOrUndefined) {
__ PushRoot(RootIndex::kUndefinedValue);
__ decl(rcx); // Subtract one for receiver.
}
// rbx and rdx will be modified.
Generate_InterpreterPushArgs(masm, rcx, rbx, rdx);
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
__ Pop(rbx); // Pass the spread in a register
__ decl(rax); // Subtract one for spread
}
// Call the target.
__ PushReturnAddressFrom(kScratchRegister); // Re-push return address.
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
__ Jump(BUILTIN_CODE(masm->isolate(), CallWithSpread),
RelocInfo::CODE_TARGET);
} else {
__ Jump(masm->isolate()->builtins()->Call(receiver_mode),
RelocInfo::CODE_TARGET);
}
// Throw stack overflow exception.
__ bind(&stack_overflow);
{
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// This should be unreachable.
__ int3();
}
}
// static
void Builtins::Generate_InterpreterPushArgsThenConstructImpl(
MacroAssembler* masm, InterpreterPushArgsMode mode) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the new target (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -- rdi : the constructor to call (can be any Object)
// -- rbx : the allocation site feedback if available, undefined otherwise
// -- rcx : 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.
// -----------------------------------
Label stack_overflow;
// Add a stack check before pushing arguments.
Generate_StackOverflowCheck(masm, rax, r8, &stack_overflow);
// Pop return address to allow tail-call after pushing arguments.
__ PopReturnAddressTo(kScratchRegister);
// Push slot for the receiver to be constructed.
__ Push(Immediate(0));
// rcx and r8 will be modified.
Generate_InterpreterPushArgs(masm, rax, rcx, r8);
if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
__ Pop(rbx); // Pass the spread in a register
__ decl(rax); // Subtract one for spread
// Push return address in preparation for the tail-call.
__ PushReturnAddressFrom(kScratchRegister);
} else {
__ PushReturnAddressFrom(kScratchRegister);
__ AssertUndefinedOrAllocationSite(rbx);
}
if (mode == InterpreterPushArgsMode::kArrayFunction) {
// Tail call to the array construct stub (still in the caller
// context at this point).
__ AssertFunction(rdi);
// Jump to the constructor function (rax, rbx, rdx passed on).
Handle<Code> code = BUILTIN_CODE(masm->isolate(), ArrayConstructorImpl);
__ Jump(code, RelocInfo::CODE_TARGET);
} else if (mode == InterpreterPushArgsMode::kWithFinalSpread) {
// Call the constructor (rax, rdx, rdi passed on).
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructWithSpread),
RelocInfo::CODE_TARGET);
} else {
DCHECK_EQ(InterpreterPushArgsMode::kOther, mode);
// Call the constructor (rax, rdx, rdi passed on).
__ Jump(BUILTIN_CODE(masm->isolate(), Construct), RelocInfo::CODE_TARGET);
}
// Throw stack overflow exception.
__ bind(&stack_overflow);
{
__ TailCallRuntime(Runtime::kThrowStackOverflow);
// This should be unreachable.
__ int3();
}
}
static void Generate_InterpreterEnterBytecode(MacroAssembler* masm) {
// Set the return address to the correct point in the interpreter entry
// trampoline.
Label builtin_trampoline, trampoline_loaded;
Smi interpreter_entry_return_pc_offset(
masm->isolate()->heap()->interpreter_entry_return_pc_offset());
DCHECK_NE(interpreter_entry_return_pc_offset, Smi::kZero);
// 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.
__ movq(rbx, Operand(rbp, StandardFrameConstants::kFunctionOffset));
__ LoadTaggedPointerField(
rbx, FieldOperand(rbx, JSFunction::kSharedFunctionInfoOffset));
__ LoadTaggedPointerField(
rbx, FieldOperand(rbx, SharedFunctionInfo::kFunctionDataOffset));
__ CmpObjectType(rbx, INTERPRETER_DATA_TYPE, kScratchRegister);
__ j(not_equal, &builtin_trampoline, Label::kNear);
__ movq(rbx,
FieldOperand(rbx, InterpreterData::kInterpreterTrampolineOffset));
__ addq(rbx, Immediate(Code::kHeaderSize - kHeapObjectTag));
__ jmp(&trampoline_loaded, Label::kNear);
__ bind(&builtin_trampoline);
// TODO(jgruber): Replace this by a lookup in the builtin entry table.
__ movq(rbx,
__ ExternalReferenceAsOperand(
ExternalReference::
address_of_interpreter_entry_trampoline_instruction_start(
masm->isolate()),
kScratchRegister));
__ bind(&trampoline_loaded);
__ addq(rbx, Immediate(interpreter_entry_return_pc_offset.value()));
__ Push(rbx);
// Initialize dispatch table register.
__ Move(
kInterpreterDispatchTableRegister,
ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
// Get the bytecode array pointer from the frame.
__ movq(kInterpreterBytecodeArrayRegister,
Operand(rbp, InterpreterFrameConstants::kBytecodeArrayFromFp));
if (FLAG_debug_code) {
// Check function data field is actually a BytecodeArray object.
__ AssertNotSmi(kInterpreterBytecodeArrayRegister);
__ CmpObjectType(kInterpreterBytecodeArrayRegister, BYTECODE_ARRAY_TYPE,
rbx);
__ Assert(
equal,
AbortReason::kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
}
// Get the target bytecode offset from the frame.
__ movq(kInterpreterBytecodeOffsetRegister,
Operand(rbp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister,
kInterpreterBytecodeOffsetRegister);
// Dispatch to the target bytecode.
__ movzxbq(r11, Operand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, times_1, 0));
__ movq(kJavaScriptCallCodeStartRegister,
Operand(kInterpreterDispatchTableRegister, r11,
times_system_pointer_size, 0));
__ jmp(kJavaScriptCallCodeStartRegister);
}
void Builtins::Generate_InterpreterEnterBytecodeAdvance(MacroAssembler* masm) {
// Get bytecode array and bytecode offset from the stack frame.
__ movq(kInterpreterBytecodeArrayRegister,
Operand(rbp, InterpreterFrameConstants::kBytecodeArrayFromFp));
__ movq(kInterpreterBytecodeOffsetRegister,
Operand(rbp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
__ SmiUntag(kInterpreterBytecodeOffsetRegister,
kInterpreterBytecodeOffsetRegister);
// Load the current bytecode.
__ movzxbq(rbx, Operand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, times_1, 0));
// Advance to the next bytecode.
Label if_return;
AdvanceBytecodeOffsetOrReturn(masm, kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister, rbx, rcx,
&if_return);
// Convert new bytecode offset to a Smi and save in the stackframe.
__ SmiTag(rbx, kInterpreterBytecodeOffsetRegister);
__ movq(Operand(rbp, InterpreterFrameConstants::kBytecodeOffsetFromFp), rbx);
Generate_InterpreterEnterBytecode(masm);
// We should never take the if_return path.
__ bind(&if_return);
__ Abort(AbortReason::kInvalidBytecodeAdvance);
}
void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
Generate_InterpreterEnterBytecode(masm);
}
void Builtins::Generate_InstantiateAsmJs(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argument count (preserved for callee)
// -- rdx : new target (preserved for callee)
// -- rdi : target function (preserved for callee)
// -----------------------------------
Label failed;
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Preserve argument count for later compare.
__ movq(rcx, rax);
// Push the number of arguments to the callee.
__ SmiTag(rax, rax);
__ Push(rax);
// Push a copy of the target function and the new target.
__ Push(rdi);
__ Push(rdx);
// The function.
__ Push(rdi);
// Copy arguments from caller (stdlib, foreign, heap).
Label args_done;
for (int j = 0; j < 4; ++j) {
Label over;
if (j < 3) {
__ cmpq(rcx, Immediate(j));
__ j(not_equal, &over, Label::kNear);
}
for (int i = j - 1; i >= 0; --i) {
__ Push(Operand(rbp, StandardFrameConstants::kCallerSPOffset +
i * kSystemPointerSize));
}
for (int i = 0; i < 3 - j; ++i) {
__ PushRoot(RootIndex::kUndefinedValue);
}
if (j < 3) {
__ jmp(&args_done, Label::kNear);
__ bind(&over);
}
}
__ bind(&args_done);
// Call runtime, on success unwind frame, and parent frame.
__ CallRuntime(Runtime::kInstantiateAsmJs, 4);
// A smi 0 is returned on failure, an object on success.
__ JumpIfSmi(rax, &failed, Label::kNear);
__ Drop(2);
__ Pop(rcx);
__ SmiUntag(rcx, rcx);
scope.GenerateLeaveFrame();
__ PopReturnAddressTo(rbx);
__ incq(rcx);
__ leaq(rsp, Operand(rsp, rcx, times_system_pointer_size, 0));
__ PushReturnAddressFrom(rbx);
__ ret(0);
__ bind(&failed);
// Restore target function and new target.
__ Pop(rdx);
__ Pop(rdi);
__ Pop(rax);
__ SmiUntag(rax, rax);
}
// On failure, tail call back to regular js by re-calling the function
// which has be reset to the compile lazy builtin.
__ LoadTaggedPointerField(rcx, FieldOperand(rdi, JSFunction::kCodeOffset));
__ JumpCodeObject(rcx);
}
namespace {
void Generate_ContinueToBuiltinHelper(MacroAssembler* masm,
bool java_script_builtin,
bool with_result) {
const RegisterConfiguration* config(RegisterConfiguration::Default());
int allocatable_register_count = config->num_allocatable_general_registers();
if (with_result) {
// Overwrite the hole inserted by the deoptimizer with the return value from
// the LAZY deopt point.
__ movq(
Operand(rsp, config->num_allocatable_general_registers() *
kSystemPointerSize +
BuiltinContinuationFrameConstants::kFixedFrameSize),
rax);
}
for (int i = allocatable_register_count - 1; i >= 0; --i) {
int code = config->GetAllocatableGeneralCode(i);
__ popq(Register::from_code(code));
if (java_script_builtin && code == kJavaScriptCallArgCountRegister.code()) {
__ SmiUntag(Register::from_code(code), Register::from_code(code));
}
}
__ movq(
rbp,
Operand(rsp, BuiltinContinuationFrameConstants::kFixedFrameSizeFromFp));
const int offsetToPC =
BuiltinContinuationFrameConstants::kFixedFrameSizeFromFp -
kSystemPointerSize;
__ popq(Operand(rsp, offsetToPC));
__ Drop(offsetToPC / kSystemPointerSize);
// Replace the builtin index Smi on the stack with the instruction start
// address of the builtin from the builtins table, and then Ret to this
// address
__ movq(kScratchRegister, Operand(rsp, 0));
__ movq(kScratchRegister,
__ EntryFromBuiltinIndexAsOperand(kScratchRegister));
__ movq(Operand(rsp, 0), kScratchRegister);
__ Ret();
}
} // 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) {
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kNotifyDeoptimized);
// Tear down internal frame.
}
DCHECK_EQ(kInterpreterAccumulatorRegister.code(), rax.code());
__ movq(rax, Operand(rsp, kPCOnStackSize));
__ ret(1 * kSystemPointerSize); // Remove rax.
}
// static
void Builtins::Generate_FunctionPrototypeApply(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rsp[0] : return address
// -- rsp[8] : argArray
// -- rsp[16] : thisArg
// -- rsp[24] : receiver
// -----------------------------------
// 1. Load receiver into rdi, argArray into rbx (if present), remove all
// arguments from the stack (including the receiver), and push thisArg (if
// present) instead.
{
Label no_arg_array, no_this_arg;
StackArgumentsAccessor args(rsp, rax);
__ LoadRoot(rdx, RootIndex::kUndefinedValue);
__ movq(rbx, rdx);
__ movq(rdi, args.GetReceiverOperand());
__ testq(rax, rax);
__ j(zero, &no_this_arg, Label::kNear);
{
__ movq(rdx, args.GetArgumentOperand(1));
__ cmpq(rax, Immediate(1));
__ j(equal, &no_arg_array, Label::kNear);
__ movq(rbx, args.GetArgumentOperand(2));
__ bind(&no_arg_array);
}
__ bind(&no_this_arg);
__ PopReturnAddressTo(rcx);
__ leaq(rsp,
Operand(rsp, rax, times_system_pointer_size, kSystemPointerSize));
__ Push(rdx);
__ PushReturnAddressFrom(rcx);
}
// ----------- S t a t e -------------
// -- rbx : argArray
// -- rdi : receiver
// -- rsp[0] : return address
// -- rsp[8] : 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(rbx, RootIndex::kNullValue, &no_arguments, Label::kNear);
__ JumpIfRoot(rbx, RootIndex::kUndefinedValue, &no_arguments, Label::kNear);
// 4a. Apply the receiver to the given argArray.
__ Jump(BUILTIN_CODE(masm->isolate(), CallWithArrayLike),
RelocInfo::CODE_TARGET);
// 4b. The argArray is either null or undefined, so we tail call without any
// arguments to the receiver. Since we did not create a frame for
// Function.prototype.apply() yet, we use a normal Call builtin here.
__ bind(&no_arguments);
{
__ Set(rax, 0);
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
}
// static
void Builtins::Generate_FunctionPrototypeCall(MacroAssembler* masm) {
// Stack Layout:
// rsp[0] : Return address
// rsp[8] : Argument n
// rsp[16] : Argument n-1
// ...
// rsp[8 * n] : Argument 1
// rsp[8 * (n + 1)] : Receiver (callable to call)
//
// rax contains the number of arguments, n, not counting the receiver.
//
// 1. Make sure we have at least one argument.
{
Label done;
__ testq(rax, rax);
__ j(not_zero, &done, Label::kNear);
__ PopReturnAddressTo(rbx);
__ PushRoot(RootIndex::kUndefinedValue);
__ PushReturnAddressFrom(rbx);
__ incq(rax);
__ bind(&done);
}
// 2. Get the callable to call (passed as receiver) from the stack.
{
StackArgumentsAccessor args(rsp, rax);
__ movq(rdi, args.GetReceiverOperand());
}
// 3. Shift arguments and return address one slot down on the stack
// (overwriting the original receiver). Adjust argument count to make
// the original first argument the new receiver.
{
Label loop;
__ movq(rcx, rax);
StackArgumentsAccessor args(rsp, rcx);
__ bind(&loop);
__ movq(rbx, args.GetArgumentOperand(1));
__ movq(args.GetArgumentOperand(0), rbx);
__ decq(rcx);
__ j(not_zero, &loop); // While non-zero.
__ DropUnderReturnAddress(1, rbx); // Drop one slot under return address.
__ decq(rax); // One fewer argument (first argument is new receiver).
}
// 4. Call the callable.
// Since we did not create a frame for Function.prototype.call() yet,
// we use a normal Call builtin here.
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rsp[0] : return address
// -- rsp[8] : argumentsList
// -- rsp[16] : thisArgument
// -- rsp[24] : target
// -- rsp[32] : receiver
// -----------------------------------
// 1. Load target into rdi (if present), argumentsList into rbx (if present),
// remove all arguments from the stack (including the receiver), and push
// thisArgument (if present) instead.
{
Label done;
StackArgumentsAccessor args(rsp, rax);
__ LoadRoot(rdi, RootIndex::kUndefinedValue);
__ movq(rdx, rdi);
__ movq(rbx, rdi);
__ cmpq(rax, Immediate(1));
__ j(below, &done, Label::kNear);
__ movq(rdi, args.GetArgumentOperand(1)); // target
__ j(equal, &done, Label::kNear);
__ movq(rdx, args.GetArgumentOperand(2)); // thisArgument
__ cmpq(rax, Immediate(3));
__ j(below, &done, Label::kNear);
__ movq(rbx, args.GetArgumentOperand(3)); // argumentsList
__ bind(&done);
__ PopReturnAddressTo(rcx);
__ leaq(rsp,
Operand(rsp, rax, times_system_pointer_size, kSystemPointerSize));
__ Push(rdx);
__ PushReturnAddressFrom(rcx);
}
// ----------- S t a t e -------------
// -- rbx : argumentsList
// -- rdi : target
// -- rsp[0] : return address
// -- rsp[8] : thisArgument
// -----------------------------------
// 2. We don't need to check explicitly for callable target here,
// since that's the first thing the Call/CallWithArrayLike builtins
// will do.
// 3. Apply the target to the given argumentsList.
__ Jump(BUILTIN_CODE(masm->isolate(), CallWithArrayLike),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rsp[0] : return address
// -- rsp[8] : new.target (optional)
// -- rsp[16] : argumentsList
// -- rsp[24] : target
// -- rsp[32] : receiver
// -----------------------------------
// 1. Load target into rdi (if present), argumentsList into rbx (if present),
// new.target into rdx (if present, otherwise use target), remove all
// arguments from the stack (including the receiver), and push thisArgument
// (if present) instead.
{
Label done;
StackArgumentsAccessor args(rsp, rax);
__ LoadRoot(rdi, RootIndex::kUndefinedValue);
__ movq(rdx, rdi);
__ movq(rbx, rdi);
__ cmpq(rax, Immediate(1));
__ j(below, &done, Label::kNear);
__ movq(rdi, args.GetArgumentOperand(1)); // target
__ movq(rdx, rdi); // new.target defaults to target
__ j(equal, &done, Label::kNear);
__ movq(rbx, args.GetArgumentOperand(2)); // argumentsList
__ cmpq(rax, Immediate(3));
__ j(below, &done, Label::kNear);
__ movq(rdx, args.GetArgumentOperand(3)); // new.target
__ bind(&done);
__ PopReturnAddressTo(rcx);
__ leaq(rsp,
Operand(rsp, rax, times_system_pointer_size, kSystemPointerSize));
__ PushRoot(RootIndex::kUndefinedValue);
__ PushReturnAddressFrom(rcx);
}
// ----------- S t a t e -------------
// -- rbx : argumentsList
// -- rdx : new.target
// -- rdi : target
// -- rsp[0] : return address
// -- rsp[8] : receiver (undefined)
// -----------------------------------
// 2. We don't need to check explicitly for constructor target here,
// since that's the first thing the Construct/ConstructWithArrayLike
// builtins will do.
// 3. We don't need to check explicitly for constructor new.target here,
// since that's the second thing the Construct/ConstructWithArrayLike
// builtins will do.
// 4. Construct the target with the given new.target and argumentsList.
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructWithArrayLike),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_InternalArrayConstructor(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -----------------------------------
if (FLAG_debug_code) {
// Initial map for the builtin InternalArray functions should be maps.
__ LoadTaggedPointerField(
rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a nullptr and a Smi.
STATIC_ASSERT(kSmiTag == 0);
Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
__ Check(not_smi,
AbortReason::kUnexpectedInitialMapForInternalArrayFunction);
__ CmpObjectType(rbx, MAP_TYPE, rcx);
__ Check(equal, AbortReason::kUnexpectedInitialMapForInternalArrayFunction);
}
// Run the native code for the InternalArray function called as a normal
// function.
__ Jump(BUILTIN_CODE(masm->isolate(), InternalArrayConstructorImpl),
RelocInfo::CODE_TARGET);
}
static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
__ pushq(rbp);
__ movq(rbp, rsp);
// Store the arguments adaptor context sentinel.
__ Push(Immediate(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
// Push the function on the stack.
__ Push(rdi);
// Preserve the number of arguments on the stack. Must preserve rax,
// rbx and rcx because these registers are used when copying the
// arguments and the receiver.
__ SmiTag(r8, rax);
__ Push(r8);
__ Push(Immediate(0)); // Padding.
}
static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
// Retrieve the number of arguments from the stack. Number is a Smi.
__ movq(rbx, Operand(rbp, ArgumentsAdaptorFrameConstants::kLengthOffset));
// Leave the frame.
__ movq(rsp, rbp);
__ popq(rbp);
// Remove caller arguments from the stack.
__ PopReturnAddressTo(rcx);
SmiIndex index = masm->SmiToIndex(rbx, rbx, kSystemPointerSizeLog2);
__ leaq(rsp, Operand(rsp, index.reg, index.scale, 1 * kSystemPointerSize));
__ PushReturnAddressFrom(rcx);
}
void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : actual number of arguments
// -- rbx : expected number of arguments
// -- rdx : new target (passed through to callee)
// -- rdi : function (passed through to callee)
// -----------------------------------
Label dont_adapt_arguments, stack_overflow, skip_adapt_arguments;
__ cmpq(rbx, Immediate(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
__ j(equal, &dont_adapt_arguments);
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ testl(
FieldOperand(rcx, SharedFunctionInfo::kFlagsOffset),
Immediate(SharedFunctionInfo::IsSafeToSkipArgumentsAdaptorBit::kMask));
__ j(not_zero, &skip_adapt_arguments);
// -------------------------------------------
// Adapt arguments.
// -------------------------------------------
{
EnterArgumentsAdaptorFrame(masm);
Generate_StackOverflowCheck(masm, rbx, rcx, &stack_overflow);
Label under_application, over_application, invoke;
__ cmpq(rax, rbx);
__ j(less, &under_application, Label::kNear);
// Enough parameters: Actual >= expected.
__ bind(&over_application);
{
// Copy receiver and all expected arguments.
const int offset = StandardFrameConstants::kCallerSPOffset;
__ leaq(r8, Operand(rbp, rax, times_system_pointer_size, offset));
__ Set(rax, -1); // account for receiver
Label copy;
__ bind(©);
__ incq(rax);
__ Push(Operand(r8, 0));
__ subq(r8, Immediate(kSystemPointerSize));
__ cmpq(rax, rbx);
__ j(less, ©);
__ jmp(&invoke, Label::kNear);
}
// Too few parameters: Actual < expected.
__ bind(&under_application);
{
// Copy receiver and all actual arguments.
const int offset = StandardFrameConstants::kCallerSPOffset;
__ leaq(r9, Operand(rbp, rax, times_system_pointer_size, offset));
__ Set(r8, -1); // account for receiver
Label copy;
__ bind(©);
__ incq(r8);
__ Push(Operand(r9, 0));
__ subq(r9, Immediate(kSystemPointerSize));
__ cmpq(r8, rax);
__ j(less, ©);
// Fill remaining expected arguments with undefined values.
Label fill;
__ LoadRoot(kScratchRegister, RootIndex::kUndefinedValue);
__ bind(&fill);
__ incq(rax);
__ Push(kScratchRegister);
__ cmpq(rax, rbx);
__ j(less, &fill);
}
// Call the entry point.
__ bind(&invoke);
// rax : expected number of arguments
// rdx : new target (passed through to callee)
// rdi : function (passed through to callee)
static_assert(kJavaScriptCallCodeStartRegister == rcx, "ABI mismatch");
__ LoadTaggedPointerField(rcx, FieldOperand(rdi, JSFunction::kCodeOffset));
__ CallCodeObject(rcx);
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(
masm->pc_offset());
// Leave frame and return.
LeaveArgumentsAdaptorFrame(masm);
__ ret(0);
}
// -------------------------------------------
// Skip adapt arguments.
// -------------------------------------------
__ bind(&skip_adapt_arguments);
{
// The callee cannot observe the actual arguments, so it's safe to just
// pass the expected arguments by massaging the stack appropriately. See
// http://bit.ly/v8-faster-calls-with-arguments-mismatch for details.
Label under_application, over_application, invoke;
__ PopReturnAddressTo(rcx);
__ cmpq(rax, rbx);
__ j(less, &under_application, Label::kNear);
__ bind(&over_application);
{
// Remove superfluous parameters from the stack.
__ xchgq(rax, rbx);
__ subq(rbx, rax);
__ leaq(rsp, Operand(rsp, rbx, times_system_pointer_size, 0));
__ jmp(&invoke, Label::kNear);
}
__ bind(&under_application);
{
// Fill remaining expected arguments with undefined values.
Label fill;
__ LoadRoot(kScratchRegister, RootIndex::kUndefinedValue);
__ bind(&fill);
__ incq(rax);
__ Push(kScratchRegister);
__ cmpq(rax, rbx);
__ j(less, &fill);
}
__ bind(&invoke);
__ PushReturnAddressFrom(rcx);
}
// -------------------------------------------
// Don't adapt arguments.
// -------------------------------------------
__ bind(&dont_adapt_arguments);
static_assert(kJavaScriptCallCodeStartRegister == rcx, "ABI mismatch");
__ LoadTaggedPointerField(rcx, FieldOperand(rdi, JSFunction::kCodeOffset));
__ JumpCodeObject(rcx);
__ bind(&stack_overflow);
{
FrameScope frame(masm, StackFrame::MANUAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
__ int3();
}
}
// static
void Builtins::Generate_CallOrConstructVarargs(MacroAssembler* masm,
Handle<Code> code) {
// ----------- S t a t e -------------
// -- rdi : target
// -- rax : number of parameters on the stack (not including the receiver)
// -- rbx : arguments list (a FixedArray)
// -- rcx : len (number of elements to push from args)
// -- rdx : new.target (for [[Construct]])
// -- rsp[0] : return address
// -----------------------------------
Register scratch = r11;
Register decompr_scratch = COMPRESS_POINTERS_BOOL ? r12 : no_reg;
if (masm->emit_debug_code()) {
// Allow rbx to be a FixedArray, or a FixedDoubleArray if rcx == 0.
Label ok, fail;
__ AssertNotSmi(rbx);
Register map = r9;
__ LoadTaggedPointerField(map, FieldOperand(rbx, HeapObject::kMapOffset));
__ CmpInstanceType(map, FIXED_ARRAY_TYPE);
__ j(equal, &ok);
__ CmpInstanceType(map, FIXED_DOUBLE_ARRAY_TYPE);
__ j(not_equal, &fail);
__ cmpl(rcx, Immediate(0));
__ j(equal, &ok);
// Fall through.
__ bind(&fail);
__ Abort(AbortReason::kOperandIsNotAFixedArray);
__ bind(&ok);
}
Label stack_overflow;
Generate_StackOverflowCheck(masm, rcx, r8, &stack_overflow, Label::kNear);
// Push additional arguments onto the stack.
{
Register value = scratch;
__ PopReturnAddressTo(r8);
__ Set(r9, 0);
Label done, push, loop;
__ bind(&loop);
__ cmpl(r9, rcx);
__ j(equal, &done, Label::kNear);
// Turn the hole into undefined as we go.
__ LoadAnyTaggedField(
value,
FieldOperand(rbx, r9, times_tagged_size, FixedArray::kHeaderSize),
decompr_scratch);
__ CompareRoot(value, RootIndex::kTheHoleValue);
__ j(not_equal, &push, Label::kNear);
__ LoadRoot(value, RootIndex::kUndefinedValue);
__ bind(&push);
__ Push(value);
__ incl(r9);
__ jmp(&loop);
__ bind(&done);
__ PushReturnAddressFrom(r8);
__ addq(rax, r9);
}
// Tail-call to the actual Call or Construct builtin.
__ Jump(code, RelocInfo::CODE_TARGET);
__ bind(&stack_overflow);
__ TailCallRuntime(Runtime::kThrowStackOverflow);
}
// static
void Builtins::Generate_CallOrConstructForwardVarargs(MacroAssembler* masm,
CallOrConstructMode mode,
Handle<Code> code) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the new target (for [[Construct]] calls)
// -- rdi : the target to call (can be any Object)
// -- rcx : start index (to support rest parameters)
// -----------------------------------
// Check if new.target has a [[Construct]] internal method.
if (mode == CallOrConstructMode::kConstruct) {
Label new_target_constructor, new_target_not_constructor;
__ JumpIfSmi(rdx, &new_target_not_constructor, Label::kNear);
__ LoadTaggedPointerField(rbx, FieldOperand(rdx, HeapObject::kMapOffset));
__ testb(FieldOperand(rbx, Map::kBitFieldOffset),
Immediate(Map::IsConstructorBit::kMask));
__ j(not_zero, &new_target_constructor, Label::kNear);
__ bind(&new_target_not_constructor);
{
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::INTERNAL);
__ Push(rdx);
__ CallRuntime(Runtime::kThrowNotConstructor);
}
__ bind(&new_target_constructor);
}
// Check if we have an arguments adaptor frame below the function frame.
Label arguments_adaptor, arguments_done;
__ movq(rbx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
__ cmpq(Operand(rbx, CommonFrameConstants::kContextOrFrameTypeOffset),
Immediate(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
__ j(equal, &arguments_adaptor, Label::kNear);
{
__ movq(r8, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
__ LoadTaggedPointerField(
r8, FieldOperand(r8, JSFunction::kSharedFunctionInfoOffset));
__ movzxwq(
r8, FieldOperand(r8, SharedFunctionInfo::kFormalParameterCountOffset));
__ movq(rbx, rbp);
}
__ jmp(&arguments_done, Label::kNear);
__ bind(&arguments_adaptor);
{
__ SmiUntag(r8,
Operand(rbx, ArgumentsAdaptorFrameConstants::kLengthOffset));
}
__ bind(&arguments_done);
Label stack_done, stack_overflow;
__ subl(r8, rcx);
__ j(less_equal, &stack_done);
{
// Check for stack overflow.
Generate_StackOverflowCheck(masm, r8, rcx, &stack_overflow, Label::kNear);
// Forward the arguments from the caller frame.
{
Label loop;
__ addl(rax, r8);
__ PopReturnAddressTo(rcx);
__ bind(&loop);
{
StackArgumentsAccessor args(rbx, r8, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ Push(args.GetArgumentOperand(0));
__ decl(r8);
__ j(not_zero, &loop);
}
__ PushReturnAddressFrom(rcx);
}
}
__ jmp(&stack_done, Label::kNear);
__ bind(&stack_overflow);
__ TailCallRuntime(Runtime::kThrowStackOverflow);
__ bind(&stack_done);
// Tail-call to the {code} handler.
__ Jump(code, RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_CallFunction(MacroAssembler* masm,
ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdi : the function to call (checked to be a JSFunction)
// -----------------------------------
StackArgumentsAccessor args(rsp, rax);
__ AssertFunction(rdi);
// ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
// Check that the function is not a "classConstructor".
Label class_constructor;
__ LoadTaggedPointerField(
rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ testl(FieldOperand(rdx, SharedFunctionInfo::kFlagsOffset),
Immediate(SharedFunctionInfo::IsClassConstructorBit::kMask));
__ j(not_zero, &class_constructor);
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the shared function info.
// -- rdi : the function to call (checked to be a JSFunction)
// -----------------------------------
// 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.
__ LoadTaggedPointerField(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
// We need to convert the receiver for non-native sloppy mode functions.
Label done_convert;
__ testl(FieldOperand(rdx, SharedFunctionInfo::kFlagsOffset),
Immediate(SharedFunctionInfo::IsNativeBit::kMask |
SharedFunctionInfo::IsStrictBit::kMask));
__ j(not_zero, &done_convert);
{
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the shared function info.
// -- rdi : the function to call (checked to be a JSFunction)
// -- rsi : the function context.
// -----------------------------------
if (mode == ConvertReceiverMode::kNullOrUndefined) {
// Patch receiver to global proxy.
__ LoadGlobalProxy(rcx);
} else {
Label convert_to_object, convert_receiver;
__ movq(rcx, args.GetReceiverOperand());
__ JumpIfSmi(rcx, &convert_to_object, Label::kNear);
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ CmpObjectType(rcx, FIRST_JS_RECEIVER_TYPE, rbx);
__ j(above_equal, &done_convert);
if (mode != ConvertReceiverMode::kNotNullOrUndefined) {
Label convert_global_proxy;
__ JumpIfRoot(rcx, RootIndex::kUndefinedValue, &convert_global_proxy,
Label::kNear);
__ JumpIfNotRoot(rcx, RootIndex::kNullValue, &convert_to_object,
Label::kNear);
__ bind(&convert_global_proxy);
{
// Patch receiver to global proxy.
__ LoadGlobalProxy(rcx);
}
__ jmp(&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?)
FrameScope scope(masm, StackFrame::INTERNAL);
__ SmiTag(rax, rax);
__ Push(rax);
__ Push(rdi);
__ movq(rax, rcx);
__ Push(rsi);
__ Call(BUILTIN_CODE(masm->isolate(), ToObject),
RelocInfo::CODE_TARGET);
__ Pop(rsi);
__ movq(rcx, rax);
__ Pop(rdi);
__ Pop(rax);
__ SmiUntag(rax, rax);
}
__ LoadTaggedPointerField(
rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ bind(&convert_receiver);
}
__ movq(args.GetReceiverOperand(), rcx);
}
__ bind(&done_convert);
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the shared function info.
// -- rdi : the function to call (checked to be a JSFunction)
// -- rsi : the function context.
// -----------------------------------
__ movzxwq(
rbx, FieldOperand(rdx, SharedFunctionInfo::kFormalParameterCountOffset));
ParameterCount actual(rax);
ParameterCount expected(rbx);
__ InvokeFunctionCode(rdi, no_reg, expected, actual, JUMP_FUNCTION);
// The function is a "classConstructor", need to raise an exception.
__ bind(&class_constructor);
{
FrameScope frame(masm, StackFrame::INTERNAL);
__ Push(rdi);
__ CallRuntime(Runtime::kThrowConstructorNonCallableError);
}
}
namespace {
void Generate_PushBoundArguments(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : new.target (only in case of [[Construct]])
// -- rdi : target (checked to be a JSBoundFunction)
// -----------------------------------
Register decompr_scratch = COMPRESS_POINTERS_BOOL ? r11 : no_reg;
// Load [[BoundArguments]] into rcx and length of that into rbx.
Label no_bound_arguments;
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSBoundFunction::kBoundArgumentsOffset));
__ SmiUntagField(rbx, FieldOperand(rcx, FixedArray::kLengthOffset));
__ testl(rbx, rbx);
__ j(zero, &no_bound_arguments);
{
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : new.target (only in case of [[Construct]])
// -- rdi : target (checked to be a JSBoundFunction)
// -- rcx : the [[BoundArguments]] (implemented as FixedArray)
// -- rbx : the number of [[BoundArguments]] (checked to be non-zero)
// -----------------------------------
// Check the stack for overflow.
{
Label done;
__ shlq(rbx, Immediate(kSystemPointerSizeLog2));
__ movq(kScratchRegister, rsp);
__ subq(kScratchRegister, rbx);
// We are not trying to catch interruptions (i.e. debug break and
// preemption) here, so check the "real stack limit".
__ cmpq(kScratchRegister, RealStackLimitAsOperand(masm));
__ j(above_equal, &done, Label::kNear);
{
FrameScope scope(masm, StackFrame::MANUAL);
__ EnterFrame(StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowStackOverflow);
}
__ bind(&done);
}
// Reserve stack space for the [[BoundArguments]].
__ movq(kScratchRegister, rbx);
__ AllocateStackSpace(kScratchRegister);
// Adjust effective number of arguments to include return address.
__ incl(rax);
// Relocate arguments and return address down the stack.
{
Label loop;
__ Set(rcx, 0);
__ addq(rbx, rsp);
__ bind(&loop);
__ movq(kScratchRegister,
Operand(rbx, rcx, times_system_pointer_size, 0));
__ movq(Operand(rsp, rcx, times_system_pointer_size, 0),
kScratchRegister);
__ incl(rcx);
__ cmpl(rcx, rax);
__ j(less, &loop);
}
// Copy [[BoundArguments]] to the stack (below the arguments).
{
Label loop;
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSBoundFunction::kBoundArgumentsOffset));
__ SmiUntagField(rbx, FieldOperand(rcx, FixedArray::kLengthOffset));
__ bind(&loop);
// Instead of doing decl(rbx) here subtract kTaggedSize from the header
// offset in order to move be able to move decl(rbx) right before the loop
// condition. This is necessary in order to avoid flags corruption by
// pointer decompression code.
__ LoadAnyTaggedField(r12,
FieldOperand(rcx, rbx, times_tagged_size,
FixedArray::kHeaderSize - kTaggedSize),
decompr_scratch);
__ movq(Operand(rsp, rax, times_system_pointer_size, 0), r12);
__ leal(rax, Operand(rax, 1));
__ decl(rbx);
__ j(greater, &loop);
}
// Adjust effective number of arguments (rax contains the number of
// arguments from the call plus return address plus the number of
// [[BoundArguments]]), so we need to subtract one for the return address.
__ decl(rax);
}
__ bind(&no_bound_arguments);
}
} // namespace
// static
void Builtins::Generate_CallBoundFunctionImpl(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdi : the function to call (checked to be a JSBoundFunction)
// -----------------------------------
__ AssertBoundFunction(rdi);
Register decompr_scratch = COMPRESS_POINTERS_BOOL ? r11 : no_reg;
// Patch the receiver to [[BoundThis]].
StackArgumentsAccessor args(rsp, rax);
__ LoadAnyTaggedField(rbx,
FieldOperand(rdi, JSBoundFunction::kBoundThisOffset),
decompr_scratch);
__ movq(args.GetReceiverOperand(), rbx);
// Push the [[BoundArguments]] onto the stack.
Generate_PushBoundArguments(masm);
// Call the [[BoundTargetFunction]] via the Call builtin.
__ LoadTaggedPointerField(
rdi, FieldOperand(rdi, JSBoundFunction::kBoundTargetFunctionOffset));
__ Jump(BUILTIN_CODE(masm->isolate(), Call_ReceiverIsAny),
RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdi : the target to call (can be any Object)
// -----------------------------------
StackArgumentsAccessor args(rsp, rax);
Label non_callable;
__ JumpIfSmi(rdi, &non_callable);
__ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
__ Jump(masm->isolate()->builtins()->CallFunction(mode),
RelocInfo::CODE_TARGET, equal);
__ CmpInstanceType(rcx, JS_BOUND_FUNCTION_TYPE);
__ Jump(BUILTIN_CODE(masm->isolate(), CallBoundFunction),
RelocInfo::CODE_TARGET, equal);
// Check if target has a [[Call]] internal method.
__ testb(FieldOperand(rcx, Map::kBitFieldOffset),
Immediate(Map::IsCallableBit::kMask));
__ j(zero, &non_callable, Label::kNear);
// Check if target is a proxy and call CallProxy external builtin
__ CmpInstanceType(rcx, JS_PROXY_TYPE);
__ Jump(BUILTIN_CODE(masm->isolate(), CallProxy), RelocInfo::CODE_TARGET,
equal);
// 2. Call to something else, which might have a [[Call]] internal method (if
// not we raise an exception).
// Overwrite the original receiver with the (original) target.
__ movq(args.GetReceiverOperand(), rdi);
// Let the "call_as_function_delegate" take care of the rest.
__ LoadNativeContextSlot(Context::CALL_AS_FUNCTION_DELEGATE_INDEX, rdi);
__ Jump(masm->isolate()->builtins()->CallFunction(
ConvertReceiverMode::kNotNullOrUndefined),
RelocInfo::CODE_TARGET);
// 3. Call to something that is not callable.
__ bind(&non_callable);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(rdi);
__ CallRuntime(Runtime::kThrowCalledNonCallable);
}
}
// static
void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the new target (checked to be a constructor)
// -- rdi : the constructor to call (checked to be a JSFunction)
// -----------------------------------
__ AssertConstructor(rdi);
__ AssertFunction(rdi);
// Calling convention for function specific ConstructStubs require
// rbx to contain either an AllocationSite or undefined.
__ LoadRoot(rbx, RootIndex::kUndefinedValue);
// Jump to JSBuiltinsConstructStub or JSConstructStubGeneric.
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ testl(FieldOperand(rcx, SharedFunctionInfo::kFlagsOffset),
Immediate(SharedFunctionInfo::ConstructAsBuiltinBit::kMask));
__ Jump(BUILTIN_CODE(masm->isolate(), JSBuiltinsConstructStub),
RelocInfo::CODE_TARGET, not_zero);
__ Jump(BUILTIN_CODE(masm->isolate(), JSConstructStubGeneric),
RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_ConstructBoundFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the new target (checked to be a constructor)
// -- rdi : the constructor to call (checked to be a JSBoundFunction)
// -----------------------------------
__ AssertConstructor(rdi);
__ AssertBoundFunction(rdi);
// Push the [[BoundArguments]] onto the stack.
Generate_PushBoundArguments(masm);
// Patch new.target to [[BoundTargetFunction]] if new.target equals target.
{
Label done;
__ cmpq(rdi, rdx);
__ j(not_equal, &done, Label::kNear);
__ LoadTaggedPointerField(
rdx, FieldOperand(rdi, JSBoundFunction::kBoundTargetFunctionOffset));
__ bind(&done);
}
// Construct the [[BoundTargetFunction]] via the Construct builtin.
__ LoadTaggedPointerField(
rdi, FieldOperand(rdi, JSBoundFunction::kBoundTargetFunctionOffset));
__ Jump(BUILTIN_CODE(masm->isolate(), Construct), RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_Construct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : the number of arguments (not including the receiver)
// -- rdx : the new target (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -- rdi : the constructor to call (can be any Object)
// -----------------------------------
StackArgumentsAccessor args(rsp, rax);
// Check if target is a Smi.
Label non_constructor;
__ JumpIfSmi(rdi, &non_constructor);
// Check if target has a [[Construct]] internal method.
__ LoadTaggedPointerField(rcx, FieldOperand(rdi, HeapObject::kMapOffset));
__ testb(FieldOperand(rcx, Map::kBitFieldOffset),
Immediate(Map::IsConstructorBit::kMask));
__ j(zero, &non_constructor);
// Dispatch based on instance type.
__ CmpInstanceType(rcx, JS_FUNCTION_TYPE);
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructFunction),
RelocInfo::CODE_TARGET, equal);
// Only dispatch to bound functions after checking whether they are
// constructors.
__ CmpInstanceType(rcx, JS_BOUND_FUNCTION_TYPE);
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructBoundFunction),
RelocInfo::CODE_TARGET, equal);
// Only dispatch to proxies after checking whether they are constructors.
__ CmpInstanceType(rcx, JS_PROXY_TYPE);
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructProxy), RelocInfo::CODE_TARGET,
equal);
// Called Construct on an exotic Object with a [[Construct]] internal method.
{
// Overwrite the original receiver with the (original) target.
__ movq(args.GetReceiverOperand(), rdi);
// Let the "call_as_constructor_delegate" take care of the rest.
__ LoadNativeContextSlot(Context::CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, rdi);
__ Jump(masm->isolate()->builtins()->CallFunction(),
RelocInfo::CODE_TARGET);
}
// Called Construct on an Object that doesn't have a [[Construct]] internal
// method.
__ bind(&non_constructor);
__ Jump(BUILTIN_CODE(masm->isolate(), ConstructedNonConstructable),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_InterpreterOnStackReplacement(MacroAssembler* masm) {
// Lookup the function in the JavaScript frame.
__ movq(rax, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
__ movq(rax, Operand(rax, JavaScriptFrameConstants::kFunctionOffset));
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Pass function as argument.
__ Push(rax);
__ CallRuntime(Runtime::kCompileForOnStackReplacement);
}
Label skip;
// If the code object is null, just return to the caller.
__ testq(rax, rax);
__ j(not_equal, &skip, Label::kNear);
__ ret(0);
__ bind(&skip);
// Drop the handler frame that is be sitting on top of the actual
// JavaScript frame. This is the case then OSR is triggered from bytecode.
__ leave();
// Load deoptimization data from the code object.
__ LoadTaggedPointerField(rbx,
FieldOperand(rax, Code::kDeoptimizationDataOffset));
// Load the OSR entrypoint offset from the deoptimization data.
__ SmiUntagField(
rbx, FieldOperand(rbx, FixedArray::OffsetOfElementAt(
DeoptimizationData::kOsrPcOffsetIndex)));
// Compute the target address = code_obj + header_size + osr_offset
__ leaq(rax, FieldOperand(rax, rbx, times_1, Code::kHeaderSize));
// Overwrite the return address on the stack.
__ movq(StackOperandForReturnAddress(0), rax);
// And "return" to the OSR entry point of the function.
__ ret(0);
}
void Builtins::Generate_WasmCompileLazy(MacroAssembler* masm) {
// The function index was pushed to the stack by the caller as int32.
__ Pop(r11);
// Convert to Smi for the runtime call.
__ SmiTag(r11, r11);
{
HardAbortScope hard_abort(masm); // Avoid calls to Abort.
FrameScope scope(masm, StackFrame::WASM_COMPILE_LAZY);
// Save all parameter registers (see wasm-linkage.cc). They might be
// overwritten in the runtime call below. We don't have any callee-saved
// registers in wasm, so no need to store anything else.
static_assert(WasmCompileLazyFrameConstants::kNumberOfSavedGpParamRegs ==
arraysize(wasm::kGpParamRegisters),
"frame size mismatch");
for (Register reg : wasm::kGpParamRegisters) {
__ Push(reg);
}
static_assert(WasmCompileLazyFrameConstants::kNumberOfSavedFpParamRegs ==
arraysize(wasm::kFpParamRegisters),
"frame size mismatch");
__ AllocateStackSpace(kSimd128Size * arraysize(wasm::kFpParamRegisters));
int offset = 0;
for (DoubleRegister reg : wasm::kFpParamRegisters) {
__ movdqu(Operand(rsp, offset), reg);
offset += kSimd128Size;
}
// Push the WASM instance as an explicit argument to WasmCompileLazy.
__ Push(kWasmInstanceRegister);
// Push the function index as second argument.
__ Push(r11);
// Load the correct CEntry builtin from the instance object.
__ movq(rcx, FieldOperand(kWasmInstanceRegister,
WasmInstanceObject::kIsolateRootOffset));
auto centry_id =
Builtins::kCEntry_Return1_DontSaveFPRegs_ArgvOnStack_NoBuiltinExit;
__ LoadTaggedPointerField(
rcx, MemOperand(rcx, IsolateData::builtin_slot_offset(centry_id)));
// Initialize the JavaScript context with 0. CEntry will use it to
// set the current context on the isolate.
__ Move(kContextRegister, Smi::zero());
__ CallRuntimeWithCEntry(Runtime::kWasmCompileLazy, rcx);
// The entrypoint address is the return value.
__ movq(r11, kReturnRegister0);
// Restore registers.
for (DoubleRegister reg : base::Reversed(wasm::kFpParamRegisters)) {
offset -= kSimd128Size;
__ movdqu(reg, Operand(rsp, offset));
}
DCHECK_EQ(0, offset);
__ addq(rsp, Immediate(kSimd128Size * arraysize(wasm::kFpParamRegisters)));
for (Register reg : base::Reversed(wasm::kGpParamRegisters)) {
__ Pop(reg);
}
}
// Finally, jump to the entrypoint.
__ jmp(r11);
}
void Builtins::Generate_CEntry(MacroAssembler* masm, int result_size,
SaveFPRegsMode save_doubles, ArgvMode argv_mode,
bool builtin_exit_frame) {
// rax: number of arguments including receiver
// rbx: pointer to C function (C callee-saved)
// rbp: frame pointer of calling JS frame (restored after C call)
// rsp: stack pointer (restored after C call)
// rsi: current context (restored)
//
// If argv_mode == kArgvInRegister:
// r15: pointer to the first argument
#ifdef _WIN64
// Windows 64-bit ABI passes arguments in rcx, rdx, r8, r9. It requires the
// stack to be aligned to 16 bytes. It only allows a single-word to be
// returned in register rax. Larger return sizes must be written to an address
// passed as a hidden first argument.
const Register kCCallArg0 = rcx;
const Register kCCallArg1 = rdx;
const Register kCCallArg2 = r8;
const Register kCCallArg3 = r9;
const int kArgExtraStackSpace = 2;
const int kMaxRegisterResultSize = 1;
#else
// GCC / Clang passes arguments in rdi, rsi, rdx, rcx, r8, r9. Simple results
// are returned in rax, and a struct of two pointers are returned in rax+rdx.
// Larger return sizes must be written to an address passed as a hidden first
// argument.
const Register kCCallArg0 = rdi;
const Register kCCallArg1 = rsi;
const Register kCCallArg2 = rdx;
const Register kCCallArg3 = rcx;
const int kArgExtraStackSpace = 0;
const int kMaxRegisterResultSize = 2;
#endif // _WIN64
// Enter the exit frame that transitions from JavaScript to C++.
int arg_stack_space =
kArgExtraStackSpace +
(result_size <= kMaxRegisterResultSize ? 0 : result_size);
if (argv_mode == kArgvInRegister) {
DCHECK(save_doubles == kDontSaveFPRegs);
DCHECK(!builtin_exit_frame);
__ EnterApiExitFrame(arg_stack_space);
// Move argc into r14 (argv is already in r15).
__ movq(r14, rax);
} else {
__ EnterExitFrame(
arg_stack_space, save_doubles == kSaveFPRegs,
builtin_exit_frame ? StackFrame::BUILTIN_EXIT : StackFrame::EXIT);
}
// rbx: pointer to builtin function (C callee-saved).
// rbp: frame pointer of exit frame (restored after C call).
// rsp: stack pointer (restored after C call).
// r14: number of arguments including receiver (C callee-saved).
// r15: argv pointer (C callee-saved).
// Check stack alignment.
if (FLAG_debug_code) {
__ CheckStackAlignment();
}
// Call C function. The arguments object will be created by stubs declared by
// DECLARE_RUNTIME_FUNCTION().
if (result_size <= kMaxRegisterResultSize) {
// Pass a pointer to the Arguments object as the first argument.
// Return result in single register (rax), or a register pair (rax, rdx).
__ movq(kCCallArg0, r14); // argc.
__ movq(kCCallArg1, r15); // argv.
__ Move(kCCallArg2, ExternalReference::isolate_address(masm->isolate()));
} else {
DCHECK_LE(result_size, 2);
// Pass a pointer to the result location as the first argument.
__ leaq(kCCallArg0, StackSpaceOperand(kArgExtraStackSpace));
// Pass a pointer to the Arguments object as the second argument.
__ movq(kCCallArg1, r14); // argc.
__ movq(kCCallArg2, r15); // argv.
__ Move(kCCallArg3, ExternalReference::isolate_address(masm->isolate()));
}
__ call(rbx);
if (result_size > kMaxRegisterResultSize) {
// Read result values stored on stack. Result is stored
// above the the two Arguments object slots on Win64.
DCHECK_LE(result_size, 2);
__ movq(kReturnRegister0, StackSpaceOperand(kArgExtraStackSpace + 0));
__ movq(kReturnRegister1, StackSpaceOperand(kArgExtraStackSpace + 1));
}
// Result is in rax or rdx:rax - do not destroy these registers!
// Check result for exception sentinel.
Label exception_returned;
__ CompareRoot(rax, RootIndex::kException);
__ j(equal, &exception_returned);
// Check that there is no pending exception, otherwise we
// should have returned the exception sentinel.
if (FLAG_debug_code) {
Label okay;
__ LoadRoot(r14, RootIndex::kTheHoleValue);
ExternalReference pending_exception_address = ExternalReference::Create(
IsolateAddressId::kPendingExceptionAddress, masm->isolate());
Operand pending_exception_operand =
masm->ExternalReferenceAsOperand(pending_exception_address);
__ cmpq(r14, pending_exception_operand);
__ j(equal, &okay, Label::kNear);
__ int3();
__ bind(&okay);
}
// Exit the JavaScript to C++ exit frame.
__ LeaveExitFrame(save_doubles == kSaveFPRegs, argv_mode == kArgvOnStack);
__ ret(0);
// Handling of exception.
__ bind(&exception_returned);
ExternalReference pending_handler_context_address = ExternalReference::Create(
IsolateAddressId::kPendingHandlerContextAddress, masm->isolate());
ExternalReference pending_handler_entrypoint_address =
ExternalReference::Create(
IsolateAddressId::kPendingHandlerEntrypointAddress, masm->isolate());
ExternalReference pending_handler_fp_address = ExternalReference::Create(
IsolateAddressId::kPendingHandlerFPAddress, masm->isolate());
ExternalReference pending_handler_sp_address = ExternalReference::Create(
IsolateAddressId::kPendingHandlerSPAddress, masm->isolate());
// Ask the runtime for help to determine the handler. This will set rax to
// contain the current pending exception, don't clobber it.
ExternalReference find_handler =
ExternalReference::Create(Runtime::kUnwindAndFindExceptionHandler);
{
FrameScope scope(masm, StackFrame::MANUAL);
__ movq(arg_reg_1, Immediate(0)); // argc.
__ movq(arg_reg_2, Immediate(0)); // argv.
__ Move(arg_reg_3, ExternalReference::isolate_address(masm->isolate()));
__ PrepareCallCFunction(3);
__ CallCFunction(find_handler, 3);
}
// Retrieve the handler context, SP and FP.
__ movq(rsi,
masm->ExternalReferenceAsOperand(pending_handler_context_address));
__ movq(rsp, masm->ExternalReferenceAsOperand(pending_handler_sp_address));
__ movq(rbp, masm->ExternalReferenceAsOperand(pending_handler_fp_address));
// If the handler is a JS frame, restore the context to the frame. Note that
// the context will be set to (rsi == 0) for non-JS frames.
Label skip;
__ testq(rsi, rsi);
__ j(zero, &skip, Label::kNear);
__ movq(Operand(rbp, StandardFrameConstants::kContextOffset), rsi);
__ bind(&skip);
// Reset the masking register. This is done independent of the underlying
// feature flag {FLAG_untrusted_code_mitigations} to make the snapshot work
// with both configurations. It is safe to always do this, because the
// underlying register is caller-saved and can be arbitrarily clobbered.
__ ResetSpeculationPoisonRegister();
// Compute the handler entry address and jump to it.
__ movq(rdi,
masm->ExternalReferenceAsOperand(pending_handler_entrypoint_address));
__ jmp(rdi);
}
void Builtins::Generate_DoubleToI(MacroAssembler* masm) {
Label check_negative, process_64_bits, done;
// Account for return address and saved regs.
const int kArgumentOffset = 4 * kSystemPointerSize;
MemOperand mantissa_operand(MemOperand(rsp, kArgumentOffset));
MemOperand exponent_operand(
MemOperand(rsp, kArgumentOffset + kDoubleSize / 2));
// The result is returned on the stack.
MemOperand return_operand = mantissa_operand;
Register scratch1 = rbx;
// Since we must use rcx for shifts below, use some other register (rax)
// to calculate the result if ecx is the requested return register.
Register result_reg = rax;
// Save ecx if it isn't the return register and therefore volatile, or if it
// is the return register, then save the temp register we use in its stead
// for the result.
Register save_reg = rax;
__ pushq(rcx);
__ pushq(scratch1);
__ pushq(save_reg);
__ movl(scratch1, mantissa_operand);
__ Movsd(kScratchDoubleReg, mantissa_operand);
__ movl(rcx, exponent_operand);
__ andl(rcx, Immediate(HeapNumber::kExponentMask));
__ shrl(rcx, Immediate(HeapNumber::kExponentShift));
__ leal(result_reg, MemOperand(rcx, -HeapNumber::kExponentBias));
__ cmpl(result_reg, Immediate(HeapNumber::kMantissaBits));
__ j(below, &process_64_bits, Label::kNear);
// Result is entirely in lower 32-bits of mantissa
int delta = HeapNumber::kExponentBias + Double::kPhysicalSignificandSize;
__ subl(rcx, Immediate(delta));
__ xorl(result_reg, result_reg);
__ cmpl(rcx, Immediate(31));
__ j(above, &done, Label::kNear);
__ shll_cl(scratch1);
__ jmp(&check_negative, Label::kNear);
__ bind(&process_64_bits);
__ Cvttsd2siq(result_reg, kScratchDoubleReg);
__ jmp(&done, Label::kNear);
// If the double was negative, negate the integer result.
__ bind(&check_negative);
__ movl(result_reg, scratch1);
__ negl(result_reg);
__ cmpl(exponent_operand, Immediate(0));
__ cmovl(greater, result_reg, scratch1);
// Restore registers
__ bind(&done);
__ movl(return_operand, result_reg);
__ popq(save_reg);
__ popq(scratch1);
__ popq(rcx);
__ ret(0);
}
void Builtins::Generate_InternalArrayConstructorImpl(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rdi : constructor
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -----------------------------------
if (FLAG_debug_code) {
// The array construct code is only set for the global and natives
// builtin Array functions which always have maps.
// Initial map for the builtin Array function should be a map.
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a nullptr and a Smi.
STATIC_ASSERT(kSmiTag == 0);
Condition not_smi = NegateCondition(masm->CheckSmi(rcx));
__ Check(not_smi, AbortReason::kUnexpectedInitialMapForArrayFunction);
__ CmpObjectType(rcx, MAP_TYPE, rcx);
__ Check(equal, AbortReason::kUnexpectedInitialMapForArrayFunction);
// Figure out the right elements kind
__ LoadTaggedPointerField(
rcx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Load the map's "bit field 2" into |result|. We only need the first byte,
// but the following masking takes care of that anyway.
__ movzxbq(rcx, FieldOperand(rcx, Map::kBitField2Offset));
// Retrieve elements_kind from bit field 2.
__ DecodeField<Map::ElementsKindBits>(rcx);
// Initial elements kind should be packed elements.
__ cmpl(rcx, Immediate(PACKED_ELEMENTS));
__ Assert(equal, AbortReason::kInvalidElementsKindForInternalPackedArray);
// No arguments should be passed.
__ testq(rax, rax);
__ Assert(zero, AbortReason::kWrongNumberOfArgumentsForInternalPackedArray);
}
__ Jump(
BUILTIN_CODE(masm->isolate(), InternalArrayNoArgumentConstructor_Packed),
RelocInfo::CODE_TARGET);
}
namespace {
int Offset(ExternalReference ref0, ExternalReference ref1) {
int64_t offset = (ref0.address() - ref1.address());
// Check that fits into int.
DCHECK(static_cast<int>(offset) == offset);
return static_cast<int>(offset);
}
// Calls an API function. Allocates HandleScope, extracts returned value
// from handle and propagates exceptions. Clobbers r14, r15, rbx and
// caller-save registers. Restores context. On return removes
// stack_space * kSystemPointerSize (GCed).
void CallApiFunctionAndReturn(MacroAssembler* masm, Register function_address,
ExternalReference thunk_ref,
Register thunk_last_arg, int stack_space,
Operand* stack_space_operand,
Operand return_value_operand) {
Label prologue;
Label promote_scheduled_exception;
Label delete_allocated_handles;
Label leave_exit_frame;
Isolate* isolate = masm->isolate();
Factory* factory = isolate->factory();
ExternalReference next_address =
ExternalReference::handle_scope_next_address(isolate);
const int kNextOffset = 0;
const int kLimitOffset = Offset(
ExternalReference::handle_scope_limit_address(isolate), next_address);
const int kLevelOffset = Offset(
ExternalReference::handle_scope_level_address(isolate), next_address);
ExternalReference scheduled_exception_address =
ExternalReference::scheduled_exception_address(isolate);
DCHECK(rdx == function_address || r8 == function_address);
// Allocate HandleScope in callee-save registers.
Register prev_next_address_reg = r14;
Register prev_limit_reg = rbx;
Register base_reg = r15;
__ Move(base_reg, next_address);
__ movq(prev_next_address_reg, Operand(base_reg, kNextOffset));
__ movq(prev_limit_reg, Operand(base_reg, kLimitOffset));
__ addl(Operand(base_reg, kLevelOffset), Immediate(1));
Label profiler_enabled, end_profiler_check;
__ Move(rax, ExternalReference::is_profiling_address(isolate));
__ cmpb(Operand(rax, 0), Immediate(0));
__ j(not_zero, &profiler_enabled);
__ Move(rax, ExternalReference::address_of_runtime_stats_flag());
__ cmpl(Operand(rax, 0), Immediate(0));
__ j(not_zero, &profiler_enabled);
{
// Call the api function directly.
__ Move(rax, function_address);
__ jmp(&end_profiler_check);
}
__ bind(&profiler_enabled);
{
// Third parameter is the address of the actual getter function.
__ Move(thunk_last_arg, function_address);
__ Move(rax, thunk_ref);
}
__ bind(&end_profiler_check);
// Call the api function!
__ call(rax);
// Load the value from ReturnValue
__ movq(rax, return_value_operand);
__ bind(&prologue);
// No more valid handles (the result handle was the last one). Restore
// previous handle scope.
__ subl(Operand(base_reg, kLevelOffset), Immediate(1));
__ movq(Operand(base_reg, kNextOffset), prev_next_address_reg);
__ cmpq(prev_limit_reg, Operand(base_reg, kLimitOffset));
__ j(not_equal, &delete_allocated_handles);
// Leave the API exit frame.
__ bind(&leave_exit_frame);
if (stack_space_operand != nullptr) {
DCHECK_EQ(stack_space, 0);
__ movq(rbx, *stack_space_operand);
}
__ LeaveApiExitFrame();
// Check if the function scheduled an exception.
__ Move(rdi, scheduled_exception_address);
__ Cmp(Operand(rdi, 0), factory->the_hole_value());
__ j(not_equal, &promote_scheduled_exception);
#if DEBUG
// Check if the function returned a valid JavaScript value.
Label ok;
Register return_value = rax;
Register map = rcx;
__ JumpIfSmi(return_value, &ok, Label::kNear);
__ LoadTaggedPointerField(map,
FieldOperand(return_value, HeapObject::kMapOffset));
__ CmpInstanceType(map, LAST_NAME_TYPE);
__ j(below_equal, &ok, Label::kNear);
__ CmpInstanceType(map, FIRST_JS_RECEIVER_TYPE);
__ j(above_equal, &ok, Label::kNear);
__ CompareRoot(map, RootIndex::kHeapNumberMap);
__ j(equal, &ok, Label::kNear);
__ CompareRoot(map, RootIndex::kBigIntMap);
__ j(equal, &ok, Label::kNear);
__ CompareRoot(return_value, RootIndex::kUndefinedValue);
__ j(equal, &ok, Label::kNear);
__ CompareRoot(return_value, RootIndex::kTrueValue);
__ j(equal, &ok, Label::kNear);
__ CompareRoot(return_value, RootIndex::kFalseValue);
__ j(equal, &ok, Label::kNear);
__ CompareRoot(return_value, RootIndex::kNullValue);
__ j(equal, &ok, Label::kNear);
__ Abort(AbortReason::kAPICallReturnedInvalidObject);
__ bind(&ok);
#endif
if (stack_space_operand == nullptr) {
DCHECK_NE(stack_space, 0);
__ ret(stack_space * kSystemPointerSize);
} else {
DCHECK_EQ(stack_space, 0);
__ PopReturnAddressTo(rcx);
__ addq(rsp, rbx);
__ jmp(rcx);
}
// Re-throw by promoting a scheduled exception.
__ bind(&promote_scheduled_exception);
__ TailCallRuntime(Runtime::kPromoteScheduledException);
// HandleScope limit has changed. Delete allocated extensions.
__ bind(&delete_allocated_handles);
__ movq(Operand(base_reg, kLimitOffset), prev_limit_reg);
__ movq(prev_limit_reg, rax);
__ LoadAddress(arg_reg_1, ExternalReference::isolate_address(isolate));
__ LoadAddress(rax, ExternalReference::delete_handle_scope_extensions());
__ call(rax);
__ movq(rax, prev_limit_reg);
__ jmp(&leave_exit_frame);
}
} // namespace
// TODO(jgruber): Instead of explicitly setting up implicit_args_ on the stack
// in CallApiCallback, we could use the calling convention to set up the stack
// correctly in the first place.
//
// TODO(jgruber): I suspect that most of CallApiCallback could be implemented
// as a C++ trampoline, vastly simplifying the assembly implementation.
void Builtins::Generate_CallApiCallback(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rsi : context
// -- rdx : api function address
// -- rcx : arguments count (not including the receiver)
// -- rbx : call data
// -- rdi : holder
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -- ...
// -- rsp[argc * 8] : first argument
// -- rsp[(argc + 1) * 8] : receiver
// -----------------------------------
Register api_function_address = rdx;
Register argc = rcx;
Register call_data = rbx;
Register holder = rdi;
DCHECK(!AreAliased(api_function_address, argc, holder, call_data,
kScratchRegister));
using FCA = FunctionCallbackArguments;
STATIC_ASSERT(FCA::kArgsLength == 6);
STATIC_ASSERT(FCA::kNewTargetIndex == 5);
STATIC_ASSERT(FCA::kDataIndex == 4);
STATIC_ASSERT(FCA::kReturnValueOffset == 3);
STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
STATIC_ASSERT(FCA::kIsolateIndex == 1);
STATIC_ASSERT(FCA::kHolderIndex == 0);
// Set up FunctionCallbackInfo's implicit_args on the stack as follows:
//
// Current state:
// rsp[0]: return address
//
// Target state:
// rsp[0 * kSystemPointerSize]: return address
// rsp[1 * kSystemPointerSize]: kHolder
// rsp[2 * kSystemPointerSize]: kIsolate
// rsp[3 * kSystemPointerSize]: undefined (kReturnValueDefaultValue)
// rsp[4 * kSystemPointerSize]: undefined (kReturnValue)
// rsp[5 * kSystemPointerSize]: kData
// rsp[6 * kSystemPointerSize]: undefined (kNewTarget)
__ PopReturnAddressTo(rax);
__ LoadRoot(kScratchRegister, RootIndex::kUndefinedValue);
__ Push(kScratchRegister);
__ Push(call_data);
__ Push(kScratchRegister);
__ Push(kScratchRegister);
__ PushAddress(ExternalReference::isolate_address(masm->isolate()));
__ Push(holder);
__ PushReturnAddressFrom(rax);
// Keep a pointer to kHolder (= implicit_args) in a scratch register.
// We use it below to set up the FunctionCallbackInfo object.
Register scratch = rbx;
__ leaq(scratch, Operand(rsp, 1 * kSystemPointerSize));
// Allocate the v8::Arguments structure in the arguments' space since
// it's not controlled by GC.
static constexpr int kApiStackSpace = 4;
__ EnterApiExitFrame(kApiStackSpace);
// FunctionCallbackInfo::implicit_args_ (points at kHolder as set up above).
__ movq(StackSpaceOperand(0), scratch);
// FunctionCallbackInfo::values_ (points at the first varargs argument passed
// on the stack).
__ leaq(scratch, Operand(scratch, argc, times_system_pointer_size,
(FCA::kArgsLength - 1) * kSystemPointerSize));
__ movq(StackSpaceOperand(1), scratch);
// FunctionCallbackInfo::length_.
__ movq(StackSpaceOperand(2), argc);
// We also store the number of bytes to drop from the stack after returning
// from the API function here.
__ leaq(kScratchRegister,
Operand(argc, times_system_pointer_size,
(FCA::kArgsLength + 1 /* receiver */) * kSystemPointerSize));
__ movq(StackSpaceOperand(3), kScratchRegister);
Register arguments_arg = arg_reg_1;
Register callback_arg = arg_reg_2;
// It's okay if api_function_address == callback_arg
// but not arguments_arg
DCHECK(api_function_address != arguments_arg);
// v8::InvocationCallback's argument.
__ leaq(arguments_arg, StackSpaceOperand(0));
ExternalReference thunk_ref = ExternalReference::invoke_function_callback();
// There are two stack slots above the arguments we constructed on the stack:
// the stored ebp (pushed by EnterApiExitFrame), and the return address.
static constexpr int kStackSlotsAboveFCA = 2;
Operand return_value_operand(
rbp,
(kStackSlotsAboveFCA + FCA::kReturnValueOffset) * kSystemPointerSize);
static constexpr int kUseStackSpaceOperand = 0;
Operand stack_space_operand = StackSpaceOperand(3);
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, callback_arg,
kUseStackSpaceOperand, &stack_space_operand,
return_value_operand);
}
void Builtins::Generate_CallApiGetter(MacroAssembler* masm) {
Register name_arg = arg_reg_1;
Register accessor_info_arg = arg_reg_2;
Register getter_arg = arg_reg_3;
Register api_function_address = r8;
Register receiver = ApiGetterDescriptor::ReceiverRegister();
Register holder = ApiGetterDescriptor::HolderRegister();
Register callback = ApiGetterDescriptor::CallbackRegister();
Register scratch = rax;
Register decompr_scratch1 = COMPRESS_POINTERS_BOOL ? r11 : no_reg;
Register decompr_scratch2 = COMPRESS_POINTERS_BOOL ? r12 : no_reg;
DCHECK(!AreAliased(receiver, holder, callback, scratch, decompr_scratch1,
decompr_scratch2));
// Build v8::PropertyCallbackInfo::args_ array on the stack and push property
// name below the exit frame to make GC aware of them.
STATIC_ASSERT(PropertyCallbackArguments::kShouldThrowOnErrorIndex == 0);
STATIC_ASSERT(PropertyCallbackArguments::kHolderIndex == 1);
STATIC_ASSERT(PropertyCallbackArguments::kIsolateIndex == 2);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueDefaultValueIndex == 3);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueOffset == 4);
STATIC_ASSERT(PropertyCallbackArguments::kDataIndex == 5);
STATIC_ASSERT(PropertyCallbackArguments::kThisIndex == 6);
STATIC_ASSERT(PropertyCallbackArguments::kArgsLength == 7);
// Insert additional parameters into the stack frame above return address.
__ PopReturnAddressTo(scratch);
__ Push(receiver);
__ PushTaggedAnyField(FieldOperand(callback, AccessorInfo::kDataOffset),
decompr_scratch1, decompr_scratch2);
__ LoadRoot(kScratchRegister, RootIndex::kUndefinedValue);
__ Push(kScratchRegister); // return value
__ Push(kScratchRegister); // return value default
__ PushAddress(ExternalReference::isolate_address(masm->isolate()));
__ Push(holder);
__ Push(Smi::zero()); // should_throw_on_error -> false
__ PushTaggedPointerField(FieldOperand(callback, AccessorInfo::kNameOffset),
decompr_scratch1);
__ PushReturnAddressFrom(scratch);
// v8::PropertyCallbackInfo::args_ array and name handle.
const int kStackUnwindSpace = PropertyCallbackArguments::kArgsLength + 1;
// Allocate v8::PropertyCallbackInfo in non-GCed stack space.
const int kArgStackSpace = 1;
// Load address of v8::PropertyAccessorInfo::args_ array.
__ leaq(scratch, Operand(rsp, 2 * kSystemPointerSize));
__ EnterApiExitFrame(kArgStackSpace);
// Create v8::PropertyCallbackInfo object on the stack and initialize
// it's args_ field.
Operand info_object = StackSpaceOperand(0);
__ movq(info_object, scratch);
__ leaq(name_arg, Operand(scratch, -kSystemPointerSize));
// The context register (rsi) has been saved in EnterApiExitFrame and
// could be used to pass arguments.
__ leaq(accessor_info_arg, info_object);
ExternalReference thunk_ref =
ExternalReference::invoke_accessor_getter_callback();
// It's okay if api_function_address == getter_arg
// but not accessor_info_arg or name_arg
DCHECK(api_function_address != accessor_info_arg);
DCHECK(api_function_address != name_arg);
__ LoadTaggedPointerField(
scratch, FieldOperand(callback, AccessorInfo::kJsGetterOffset));
__ movq(api_function_address,
FieldOperand(scratch, Foreign::kForeignAddressOffset));
// +3 is to skip prolog, return address and name handle.
Operand return_value_operand(
rbp,
(PropertyCallbackArguments::kReturnValueOffset + 3) * kSystemPointerSize);
Operand* const kUseStackSpaceConstant = nullptr;
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, getter_arg,
kStackUnwindSpace, kUseStackSpaceConstant,
return_value_operand);
}
void Builtins::Generate_DirectCEntry(MacroAssembler* masm) {
__ int3(); // Unused on this architecture.
}
#undef __
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_X64