// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#if V8_TARGET_ARCH_X64
#include "codegen.h"
#include "deoptimizer.h"
#include "full-codegen.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void Builtins::Generate_Adaptor(MacroAssembler* masm,
CFunctionId id,
BuiltinExtraArguments extra_args) {
// ----------- S t a t e -------------
// -- rax : number of arguments excluding receiver
// -- rdi : called function (only guaranteed when
// extra_args requires it)
// -- rsi : context
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -- ...
// -- rsp[8 * argc] : first argument (argc == rax)
// -- rsp[8 * (argc + 1)] : receiver
// -----------------------------------
// Insert extra arguments.
int num_extra_args = 0;
if (extra_args == NEEDS_CALLED_FUNCTION) {
num_extra_args = 1;
__ PopReturnAddressTo(kScratchRegister);
__ push(rdi);
__ PushReturnAddressFrom(kScratchRegister);
} else {
ASSERT(extra_args == NO_EXTRA_ARGUMENTS);
}
// JumpToExternalReference expects rax to contain the number of arguments
// including the receiver and the extra arguments.
__ addq(rax, Immediate(num_extra_args + 1));
__ JumpToExternalReference(ExternalReference(id, masm->isolate()), 1);
}
static void CallRuntimePassFunction(MacroAssembler* masm,
Runtime::FunctionId function_id) {
FrameScope scope(masm, StackFrame::INTERNAL);
// Push a copy of the function onto the stack.
__ push(rdi);
// Push call kind information.
__ push(rcx);
// Function is also the parameter to the runtime call.
__ push(rdi);
__ CallRuntime(function_id, 1);
// Restore call kind information.
__ pop(rcx);
// Restore receiver.
__ pop(rdi);
}
static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
__ movq(kScratchRegister,
FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ movq(kScratchRegister,
FieldOperand(kScratchRegister, SharedFunctionInfo::kCodeOffset));
__ lea(kScratchRegister, FieldOperand(kScratchRegister, Code::kHeaderSize));
__ jmp(kScratchRegister);
}
void Builtins::Generate_InRecompileQueue(MacroAssembler* masm) {
// Checking whether the queued function is ready for install is optional,
// since we come across interrupts and stack checks elsewhere. However,
// not checking may delay installing ready functions, and always checking
// would be quite expensive. A good compromise is to first check against
// stack limit as a cue for an interrupt signal.
Label ok;
__ CompareRoot(rsp, Heap::kStackLimitRootIndex);
__ j(above_equal, &ok);
CallRuntimePassFunction(masm, Runtime::kTryInstallRecompiledCode);
// Tail call to returned code.
__ lea(rax, FieldOperand(rax, Code::kHeaderSize));
__ jmp(rax);
__ bind(&ok);
GenerateTailCallToSharedCode(masm);
}
void Builtins::Generate_ConcurrentRecompile(MacroAssembler* masm) {
CallRuntimePassFunction(masm, Runtime::kConcurrentRecompile);
GenerateTailCallToSharedCode(masm);
}
static void Generate_JSConstructStubHelper(MacroAssembler* masm,
bool is_api_function,
bool count_constructions) {
// ----------- S t a t e -------------
// -- rax: number of arguments
// -- rdi: constructor function
// -----------------------------------
// Should never count constructions for api objects.
ASSERT(!is_api_function || !count_constructions);
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
// Store a smi-tagged arguments count on the stack.
__ Integer32ToSmi(rax, rax);
__ push(rax);
// Push the function to invoke on the stack.
__ push(rdi);
// Try to allocate the object without transitioning into C code. If any of
// the preconditions is not met, the code bails out to the runtime call.
Label rt_call, allocated;
if (FLAG_inline_new) {
Label undo_allocation;
#ifdef ENABLE_DEBUGGER_SUPPORT
ExternalReference debug_step_in_fp =
ExternalReference::debug_step_in_fp_address(masm->isolate());
__ Move(kScratchRegister, debug_step_in_fp);
__ cmpq(Operand(kScratchRegister, 0), Immediate(0));
__ j(not_equal, &rt_call);
#endif
// Verified that the constructor is a JSFunction.
// Load the initial map and verify that it is in fact a map.
// rdi: constructor
__ movq(rax, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi
ASSERT(kSmiTag == 0);
__ JumpIfSmi(rax, &rt_call);
// rdi: constructor
// rax: initial map (if proven valid below)
__ CmpObjectType(rax, MAP_TYPE, rbx);
__ j(not_equal, &rt_call);
// Check that the constructor is not constructing a JSFunction (see
// comments in Runtime_NewObject in runtime.cc). In which case the
// initial map's instance type would be JS_FUNCTION_TYPE.
// rdi: constructor
// rax: initial map
__ CmpInstanceType(rax, JS_FUNCTION_TYPE);
__ j(equal, &rt_call);
if (count_constructions) {
Label allocate;
// Decrease generous allocation count.
__ movq(rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ decb(FieldOperand(rcx,
SharedFunctionInfo::kConstructionCountOffset));
__ j(not_zero, &allocate);
__ push(rax);
__ push(rdi);
__ push(rdi); // constructor
// The call will replace the stub, so the countdown is only done once.
__ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
__ pop(rdi);
__ pop(rax);
__ bind(&allocate);
}
// Now allocate the JSObject on the heap.
__ movzxbq(rdi, FieldOperand(rax, Map::kInstanceSizeOffset));
__ shl(rdi, Immediate(kPointerSizeLog2));
// rdi: size of new object
__ Allocate(rdi,
rbx,
rdi,
no_reg,
&rt_call,
NO_ALLOCATION_FLAGS);
// Allocated the JSObject, now initialize the fields.
// rax: initial map
// rbx: JSObject (not HeapObject tagged - the actual address).
// rdi: start of next object
__ movq(Operand(rbx, JSObject::kMapOffset), rax);
__ LoadRoot(rcx, Heap::kEmptyFixedArrayRootIndex);
__ movq(Operand(rbx, JSObject::kPropertiesOffset), rcx);
__ movq(Operand(rbx, JSObject::kElementsOffset), rcx);
// Set extra fields in the newly allocated object.
// rax: initial map
// rbx: JSObject
// rdi: start of next object
__ lea(rcx, Operand(rbx, JSObject::kHeaderSize));
__ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
if (count_constructions) {
__ movzxbq(rsi,
FieldOperand(rax, Map::kPreAllocatedPropertyFieldsOffset));
__ lea(rsi,
Operand(rbx, rsi, times_pointer_size, JSObject::kHeaderSize));
// rsi: offset of first field after pre-allocated fields
if (FLAG_debug_code) {
__ cmpq(rsi, rdi);
__ Assert(less_equal,
kUnexpectedNumberOfPreAllocatedPropertyFields);
}
__ InitializeFieldsWithFiller(rcx, rsi, rdx);
__ LoadRoot(rdx, Heap::kOnePointerFillerMapRootIndex);
}
__ InitializeFieldsWithFiller(rcx, rdi, rdx);
// Add the object tag to make the JSObject real, so that we can continue
// and jump into the continuation code at any time from now on. Any
// failures need to undo the allocation, so that the heap is in a
// consistent state and verifiable.
// rax: initial map
// rbx: JSObject
// rdi: start of next object
__ or_(rbx, Immediate(kHeapObjectTag));
// Check if a non-empty properties array is needed.
// Allocate and initialize a FixedArray if it is.
// rax: initial map
// rbx: JSObject
// rdi: start of next object
// Calculate total properties described map.
__ movzxbq(rdx, FieldOperand(rax, Map::kUnusedPropertyFieldsOffset));
__ movzxbq(rcx,
FieldOperand(rax, Map::kPreAllocatedPropertyFieldsOffset));
__ addq(rdx, rcx);
// Calculate unused properties past the end of the in-object properties.
__ movzxbq(rcx, FieldOperand(rax, Map::kInObjectPropertiesOffset));
__ subq(rdx, rcx);
// Done if no extra properties are to be allocated.
__ j(zero, &allocated);
__ Assert(positive, kPropertyAllocationCountFailed);
// Scale the number of elements by pointer size and add the header for
// FixedArrays to the start of the next object calculation from above.
// rbx: JSObject
// rdi: start of next object (will be start of FixedArray)
// rdx: number of elements in properties array
__ Allocate(FixedArray::kHeaderSize,
times_pointer_size,
rdx,
rdi,
rax,
no_reg,
&undo_allocation,
RESULT_CONTAINS_TOP);
// Initialize the FixedArray.
// rbx: JSObject
// rdi: FixedArray
// rdx: number of elements
// rax: start of next object
__ LoadRoot(rcx, Heap::kFixedArrayMapRootIndex);
__ movq(Operand(rdi, HeapObject::kMapOffset), rcx); // setup the map
__ Integer32ToSmi(rdx, rdx);
__ movq(Operand(rdi, FixedArray::kLengthOffset), rdx); // and length
// Initialize the fields to undefined.
// rbx: JSObject
// rdi: FixedArray
// rax: start of next object
// rdx: number of elements
{ Label loop, entry;
__ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
__ lea(rcx, Operand(rdi, FixedArray::kHeaderSize));
__ jmp(&entry);
__ bind(&loop);
__ movq(Operand(rcx, 0), rdx);
__ addq(rcx, Immediate(kPointerSize));
__ bind(&entry);
__ cmpq(rcx, rax);
__ j(below, &loop);
}
// Store the initialized FixedArray into the properties field of
// the JSObject
// rbx: JSObject
// rdi: FixedArray
__ or_(rdi, Immediate(kHeapObjectTag)); // add the heap tag
__ movq(FieldOperand(rbx, JSObject::kPropertiesOffset), rdi);
// Continue with JSObject being successfully allocated
// rbx: JSObject
__ jmp(&allocated);
// Undo the setting of the new top so that the heap is verifiable. For
// example, the map's unused properties potentially do not match the
// allocated objects unused properties.
// rbx: JSObject (previous new top)
__ bind(&undo_allocation);
__ UndoAllocationInNewSpace(rbx);
}
// Allocate the new receiver object using the runtime call.
// rdi: function (constructor)
__ bind(&rt_call);
// Must restore rdi (constructor) before calling runtime.
__ movq(rdi, Operand(rsp, 0));
__ push(rdi);
__ CallRuntime(Runtime::kNewObject, 1);
__ movq(rbx, rax); // store result in rbx
// New object allocated.
// rbx: newly allocated object
__ bind(&allocated);
// Retrieve the function from the stack.
__ pop(rdi);
// Retrieve smi-tagged arguments count from the stack.
__ movq(rax, Operand(rsp, 0));
__ SmiToInteger32(rax, rax);
// 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(rbx);
__ push(rbx);
// Set up pointer to last argument.
__ lea(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset));
// Copy arguments and receiver to the expression stack.
Label loop, entry;
__ movq(rcx, rax);
__ jmp(&entry);
__ bind(&loop);
__ push(Operand(rbx, rcx, times_pointer_size, 0));
__ bind(&entry);
__ decq(rcx);
__ j(greater_equal, &loop);
// Call the function.
if (is_api_function) {
__ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
Handle<Code> code =
masm->isolate()->builtins()->HandleApiCallConstruct();
ParameterCount expected(0);
__ InvokeCode(code, expected, expected, RelocInfo::CODE_TARGET,
CALL_FUNCTION, NullCallWrapper(), CALL_AS_METHOD);
} else {
ParameterCount actual(rax);
__ InvokeFunction(rdi, actual, CALL_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
}
// Store offset of return address for deoptimizer.
if (!is_api_function && !count_constructions) {
masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
}
// Restore context from the frame.
__ movq(rsi, Operand(rbp, StandardFrameConstants::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, exit;
// If the result is a smi, it is *not* an object in the ECMA sense.
__ JumpIfSmi(rax, &use_receiver);
// If the type of the result (stored in its map) is less than
// FIRST_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense.
STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
__ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(above_equal, &exit);
// 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));
// Restore the arguments count and leave the construct frame.
__ bind(&exit);
__ movq(rbx, Operand(rsp, kPointerSize)); // Get arguments count.
// Leave construct frame.
}
// Remove caller arguments from the stack and return.
__ PopReturnAddressTo(rcx);
SmiIndex index = masm->SmiToIndex(rbx, rbx, kPointerSizeLog2);
__ lea(rsp, Operand(rsp, index.reg, index.scale, 1 * kPointerSize));
__ PushReturnAddressFrom(rcx);
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->constructed_objects(), 1);
__ ret(0);
}
void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, true);
}
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, false);
}
void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, true, false);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// Expects five C++ function parameters.
// - Address entry (ignored)
// - JSFunction* function (
// - Object* receiver
// - int argc
// - Object*** argv
// (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 and rsi the context.
#ifdef _WIN64
// MSVC parameters in:
// rcx : entry (ignored)
// rdx : function
// r8 : receiver
// r9 : argc
// [rsp+0x20] : argv
// Clear the context before we push it when entering the internal frame.
__ Set(rsi, 0);
// Enter an internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
// Load the function context into rsi.
__ movq(rsi, FieldOperand(rdx, JSFunction::kContextOffset));
// Push the function and the receiver onto the stack.
__ push(rdx);
__ push(r8);
// Load the number of arguments and setup pointer to the arguments.
__ movq(rax, r9);
// Load the previous frame pointer to access C argument on stack
__ movq(kScratchRegister, Operand(rbp, 0));
__ movq(rbx, Operand(kScratchRegister, EntryFrameConstants::kArgvOffset));
// Load the function pointer into rdi.
__ movq(rdi, rdx);
#else // _WIN64
// GCC parameters in:
// rdi : entry (ignored)
// rsi : function
// rdx : receiver
// rcx : argc
// r8 : argv
__ movq(rdi, rsi);
// rdi : function
// Clear the context before we push it when entering the internal frame.
__ Set(rsi, 0);
// Enter an internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
// Push the function and receiver and setup the context.
__ push(rdi);
__ push(rdx);
__ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
// Load the number of arguments and setup pointer to the arguments.
__ movq(rax, rcx);
__ movq(rbx, r8);
#endif // _WIN64
// Current stack contents:
// [rsp + 2 * kPointerSize ... ] : Internal frame
// [rsp + kPointerSize] : function
// [rsp] : receiver
// Current register contents:
// rax : argc
// rbx : argv
// rsi : context
// rdi : function
// 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);
__ bind(&loop);
__ movq(kScratchRegister, Operand(rbx, rcx, times_pointer_size, 0));
__ push(Operand(kScratchRegister, 0)); // dereference handle
__ addq(rcx, Immediate(1));
__ bind(&entry);
__ cmpq(rcx, rax);
__ j(not_equal, &loop);
// Invoke the code.
if (is_construct) {
// No type feedback cell is available
Handle<Object> undefined_sentinel(
masm->isolate()->factory()->undefined_value());
__ Move(rbx, undefined_sentinel);
// Expects rdi to hold function pointer.
CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
__ CallStub(&stub);
} else {
ParameterCount actual(rax);
// Function must be in rdi.
__ InvokeFunction(rdi, actual, CALL_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
}
// Exit the internal frame. Notice that this also removes the empty
// context and the function left on the stack by the code
// invocation.
}
// TODO(X64): Is argument correct? Is there a receiver to remove?
__ ret(1 * kPointerSize); // Remove receiver.
}
void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, false);
}
void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, true);
}
void Builtins::Generate_LazyCompile(MacroAssembler* masm) {
CallRuntimePassFunction(masm, Runtime::kLazyCompile);
// Do a tail-call of the compiled function.
__ lea(rax, FieldOperand(rax, Code::kHeaderSize));
__ jmp(rax);
}
void Builtins::Generate_LazyRecompile(MacroAssembler* masm) {
CallRuntimePassFunction(masm, Runtime::kLazyRecompile);
// Do a tail-call of the compiled function.
__ lea(rax, FieldOperand(rax, Code::kHeaderSize));
__ jmp(rax);
}
static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
// For now, we are relying on the fact that make_code_young doesn't do any
// garbage collection which allows us to save/restore the registers without
// worrying about which of them contain pointers. We also don't build an
// internal frame to make the code faster, since we shouldn't have to do stack
// crawls in MakeCodeYoung. This seems a bit fragile.
// Re-execute the code that was patched back to the young age when
// the stub returns.
__ subq(Operand(rsp, 0), Immediate(5));
__ Pushad();
__ Move(arg_reg_2, ExternalReference::isolate_address(masm->isolate()));
__ movq(arg_reg_1, Operand(rsp, kNumSafepointRegisters * kPointerSize));
{ // NOLINT
FrameScope scope(masm, StackFrame::MANUAL);
__ PrepareCallCFunction(1);
__ CallCFunction(
ExternalReference::get_make_code_young_function(masm->isolate()), 1);
}
__ Popad();
__ ret(0);
}
#define DEFINE_CODE_AGE_BUILTIN_GENERATOR(C) \
void Builtins::Generate_Make##C##CodeYoungAgainEvenMarking( \
MacroAssembler* masm) { \
GenerateMakeCodeYoungAgainCommon(masm); \
} \
void Builtins::Generate_Make##C##CodeYoungAgainOddMarking( \
MacroAssembler* masm) { \
GenerateMakeCodeYoungAgainCommon(masm); \
}
CODE_AGE_LIST(DEFINE_CODE_AGE_BUILTIN_GENERATOR)
#undef DEFINE_CODE_AGE_BUILTIN_GENERATOR
void Builtins::Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm) {
// For now, as in GenerateMakeCodeYoungAgainCommon, we are relying on the fact
// that make_code_young doesn't do any garbage collection which allows us to
// save/restore the registers without worrying about which of them contain
// pointers.
__ Pushad();
__ Move(arg_reg_2, ExternalReference::isolate_address(masm->isolate()));
__ movq(arg_reg_1, Operand(rsp, kNumSafepointRegisters * kPointerSize));
__ subq(arg_reg_1, Immediate(Assembler::kShortCallInstructionLength));
{ // NOLINT
FrameScope scope(masm, StackFrame::MANUAL);
__ PrepareCallCFunction(1);
__ CallCFunction(
ExternalReference::get_mark_code_as_executed_function(masm->isolate()),
1);
}
__ Popad();
// Perform prologue operations usually performed by the young code stub.
__ PopReturnAddressTo(kScratchRegister);
__ push(rbp); // Caller's frame pointer.
__ movq(rbp, rsp);
__ push(rsi); // Callee's context.
__ push(rdi); // Callee's JS Function.
__ PushReturnAddressFrom(kScratchRegister);
// Jump to point after the code-age stub.
__ ret(0);
}
void Builtins::Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm) {
GenerateMakeCodeYoungAgainCommon(masm);
}
static void Generate_NotifyStubFailureHelper(MacroAssembler* masm,
SaveFPRegsMode save_doubles) {
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Preserve registers across notification, this is important for compiled
// stubs that tail call the runtime on deopts passing their parameters in
// registers.
__ Pushad();
__ CallRuntime(Runtime::kNotifyStubFailure, 0, save_doubles);
__ Popad();
// Tear down internal frame.
}
__ pop(MemOperand(rsp, 0)); // Ignore state offset
__ ret(0); // Return to IC Miss stub, continuation still on stack.
}
void Builtins::Generate_NotifyStubFailure(MacroAssembler* masm) {
Generate_NotifyStubFailureHelper(masm, kDontSaveFPRegs);
}
void Builtins::Generate_NotifyStubFailureSaveDoubles(MacroAssembler* masm) {
Generate_NotifyStubFailureHelper(masm, kSaveFPRegs);
}
static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
Deoptimizer::BailoutType type) {
// Enter an internal frame.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Pass the deoptimization type to the runtime system.
__ Push(Smi::FromInt(static_cast<int>(type)));
__ CallRuntime(Runtime::kNotifyDeoptimized, 1);
// Tear down internal frame.
}
// Get the full codegen state from the stack and untag it.
__ SmiToInteger32(kScratchRegister, Operand(rsp, kPCOnStackSize));
// Switch on the state.
Label not_no_registers, not_tos_rax;
__ cmpq(kScratchRegister, Immediate(FullCodeGenerator::NO_REGISTERS));
__ j(not_equal, ¬_no_registers, Label::kNear);
__ ret(1 * kPointerSize); // Remove state.
__ bind(¬_no_registers);
__ movq(rax, Operand(rsp, kPCOnStackSize + kPointerSize));
__ cmpq(kScratchRegister, Immediate(FullCodeGenerator::TOS_REG));
__ j(not_equal, ¬_tos_rax, Label::kNear);
__ ret(2 * kPointerSize); // Remove state, rax.
__ bind(¬_tos_rax);
__ Abort(kNoCasesLeft);
}
void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
}
void Builtins::Generate_NotifySoftDeoptimized(MacroAssembler* masm) {
Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::SOFT);
}
void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
}
void Builtins::Generate_FunctionCall(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 (function 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);
__ PopReturnAddressTo(rbx);
__ Push(masm->isolate()->factory()->undefined_value());
__ PushReturnAddressFrom(rbx);
__ incq(rax);
__ bind(&done);
}
// 2. Get the function to call (passed as receiver) from the stack, check
// if it is a function.
Label slow, non_function;
StackArgumentsAccessor args(rsp, rax);
__ movq(rdi, args.GetReceiverOperand());
__ JumpIfSmi(rdi, &non_function);
__ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
__ j(not_equal, &slow);
// 3a. Patch the first argument if necessary when calling a function.
Label shift_arguments;
__ Set(rdx, 0); // indicate regular JS_FUNCTION
{ Label convert_to_object, use_global_receiver, patch_receiver;
// Change context eagerly in case we need the global receiver.
__ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
// Do not transform the receiver for strict mode functions.
__ movq(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ testb(FieldOperand(rbx, SharedFunctionInfo::kStrictModeByteOffset),
Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
__ j(not_equal, &shift_arguments);
// Do not transform the receiver for natives.
// SharedFunctionInfo is already loaded into rbx.
__ testb(FieldOperand(rbx, SharedFunctionInfo::kNativeByteOffset),
Immediate(1 << SharedFunctionInfo::kNativeBitWithinByte));
__ j(not_zero, &shift_arguments);
// Compute the receiver in non-strict mode.
__ movq(rbx, args.GetArgumentOperand(1));
__ JumpIfSmi(rbx, &convert_to_object, Label::kNear);
__ CompareRoot(rbx, Heap::kNullValueRootIndex);
__ j(equal, &use_global_receiver);
__ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
__ j(equal, &use_global_receiver);
STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
__ CmpObjectType(rbx, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(above_equal, &shift_arguments);
__ bind(&convert_to_object);
{
// Enter an internal frame in order to preserve argument count.
FrameScope scope(masm, StackFrame::INTERNAL);
__ Integer32ToSmi(rax, rax);
__ push(rax);
__ push(rbx);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
__ movq(rbx, rax);
__ Set(rdx, 0); // indicate regular JS_FUNCTION
__ pop(rax);
__ SmiToInteger32(rax, rax);
}
// Restore the function to rdi.
__ movq(rdi, args.GetReceiverOperand());
__ jmp(&patch_receiver, Label::kNear);
// Use the global receiver object from the called function as the
// receiver.
__ bind(&use_global_receiver);
const int kGlobalIndex =
Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
__ movq(rbx, FieldOperand(rsi, kGlobalIndex));
__ movq(rbx, FieldOperand(rbx, GlobalObject::kNativeContextOffset));
__ movq(rbx, FieldOperand(rbx, kGlobalIndex));
__ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
__ bind(&patch_receiver);
__ movq(args.GetArgumentOperand(1), rbx);
__ jmp(&shift_arguments);
}
// 3b. Check for function proxy.
__ bind(&slow);
__ Set(rdx, 1); // indicate function proxy
__ CmpInstanceType(rcx, JS_FUNCTION_PROXY_TYPE);
__ j(equal, &shift_arguments);
__ bind(&non_function);
__ Set(rdx, 2); // indicate non-function
// 3c. Patch the first argument when calling a non-function. The
// CALL_NON_FUNCTION builtin expects the non-function callee as
// receiver, so overwrite the first argument which will ultimately
// become the receiver.
__ movq(args.GetArgumentOperand(1), rdi);
// 4. 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.
__ bind(&shift_arguments);
{ Label loop;
__ movq(rcx, rax);
__ bind(&loop);
__ movq(rbx, Operand(rsp, rcx, times_pointer_size, 0));
__ movq(Operand(rsp, rcx, times_pointer_size, 1 * kPointerSize), rbx);
__ decq(rcx);
__ j(not_sign, &loop); // While non-negative (to copy return address).
__ pop(rbx); // Discard copy of return address.
__ decq(rax); // One fewer argument (first argument is new receiver).
}
// 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin,
// or a function proxy via CALL_FUNCTION_PROXY.
{ Label function, non_proxy;
__ testq(rdx, rdx);
__ j(zero, &function);
__ Set(rbx, 0);
__ SetCallKind(rcx, CALL_AS_METHOD);
__ cmpq(rdx, Immediate(1));
__ j(not_equal, &non_proxy);
__ PopReturnAddressTo(rdx);
__ push(rdi); // re-add proxy object as additional argument
__ PushReturnAddressFrom(rdx);
__ incq(rax);
__ GetBuiltinEntry(rdx, Builtins::CALL_FUNCTION_PROXY);
__ jmp(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
__ bind(&non_proxy);
__ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION);
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
__ bind(&function);
}
// 5b. Get the code to call from the function and check that the number of
// expected arguments matches what we're providing. If so, jump
// (tail-call) to the code in register edx without checking arguments.
__ movq(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ movsxlq(rbx,
FieldOperand(rdx,
SharedFunctionInfo::kFormalParameterCountOffset));
__ movq(rdx, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
__ SetCallKind(rcx, CALL_AS_METHOD);
__ cmpq(rax, rbx);
__ j(not_equal,
masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
ParameterCount expected(0);
__ InvokeCode(rdx, expected, expected, JUMP_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
}
void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
// Stack at entry:
// rsp : return address
// rsp[8] : arguments
// rsp[16] : receiver ("this")
// rsp[24] : function
{
FrameScope frame_scope(masm, StackFrame::INTERNAL);
// Stack frame:
// rbp : Old base pointer
// rbp[8] : return address
// rbp[16] : function arguments
// rbp[24] : receiver
// rbp[32] : function
static const int kArgumentsOffset = kFPOnStackSize + kPCOnStackSize;
static const int kReceiverOffset = kArgumentsOffset + kPointerSize;
static const int kFunctionOffset = kReceiverOffset + kPointerSize;
__ push(Operand(rbp, kFunctionOffset));
__ push(Operand(rbp, kArgumentsOffset));
__ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
Label okay;
__ LoadRoot(kScratchRegister, Heap::kRealStackLimitRootIndex);
__ movq(rcx, rsp);
// Make rcx the space we have left. The stack might already be overflowed
// here which will cause rcx to become negative.
__ subq(rcx, kScratchRegister);
// Make rdx the space we need for the array when it is unrolled onto the
// stack.
__ PositiveSmiTimesPowerOfTwoToInteger64(rdx, rax, kPointerSizeLog2);
// Check if the arguments will overflow the stack.
__ cmpq(rcx, rdx);
__ j(greater, &okay); // Signed comparison.
// Out of stack space.
__ push(Operand(rbp, kFunctionOffset));
__ push(rax);
__ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);
__ bind(&okay);
// End of stack check.
// Push current index and limit.
const int kLimitOffset =
StandardFrameConstants::kExpressionsOffset - 1 * kPointerSize;
const int kIndexOffset = kLimitOffset - 1 * kPointerSize;
__ push(rax); // limit
__ push(Immediate(0)); // index
// Get the receiver.
__ movq(rbx, Operand(rbp, kReceiverOffset));
// Check that the function is a JS function (otherwise it must be a proxy).
Label push_receiver;
__ movq(rdi, Operand(rbp, kFunctionOffset));
__ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
__ j(not_equal, &push_receiver);
// Change context eagerly to get the right global object if necessary.
__ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
// Do not transform the receiver for strict mode functions.
Label call_to_object, use_global_receiver;
__ movq(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ testb(FieldOperand(rdx, SharedFunctionInfo::kStrictModeByteOffset),
Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
__ j(not_equal, &push_receiver);
// Do not transform the receiver for natives.
__ testb(FieldOperand(rdx, SharedFunctionInfo::kNativeByteOffset),
Immediate(1 << SharedFunctionInfo::kNativeBitWithinByte));
__ j(not_equal, &push_receiver);
// Compute the receiver in non-strict mode.
__ JumpIfSmi(rbx, &call_to_object, Label::kNear);
__ CompareRoot(rbx, Heap::kNullValueRootIndex);
__ j(equal, &use_global_receiver);
__ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
__ j(equal, &use_global_receiver);
// If given receiver is already a JavaScript object then there's no
// reason for converting it.
STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
__ CmpObjectType(rbx, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(above_equal, &push_receiver);
// Convert the receiver to an object.
__ bind(&call_to_object);
__ push(rbx);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
__ movq(rbx, rax);
__ jmp(&push_receiver, Label::kNear);
// Use the current global receiver object as the receiver.
__ bind(&use_global_receiver);
const int kGlobalOffset =
Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
__ movq(rbx, FieldOperand(rsi, kGlobalOffset));
__ movq(rbx, FieldOperand(rbx, GlobalObject::kNativeContextOffset));
__ movq(rbx, FieldOperand(rbx, kGlobalOffset));
__ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
// Push the receiver.
__ bind(&push_receiver);
__ push(rbx);
// Copy all arguments from the array to the stack.
Label entry, loop;
__ movq(rax, Operand(rbp, kIndexOffset));
__ jmp(&entry);
__ bind(&loop);
__ movq(rdx, Operand(rbp, kArgumentsOffset)); // load arguments
// Use inline caching to speed up access to arguments.
Handle<Code> ic =
masm->isolate()->builtins()->KeyedLoadIC_Initialize();
__ Call(ic, RelocInfo::CODE_TARGET);
// It is important that we do not have a test instruction after the
// call. A test instruction after the call is used to indicate that
// we have generated an inline version of the keyed load. In this
// case, we know that we are not generating a test instruction next.
// Push the nth argument.
__ push(rax);
// Update the index on the stack and in register rax.
__ movq(rax, Operand(rbp, kIndexOffset));
__ SmiAddConstant(rax, rax, Smi::FromInt(1));
__ movq(Operand(rbp, kIndexOffset), rax);
__ bind(&entry);
__ cmpq(rax, Operand(rbp, kLimitOffset));
__ j(not_equal, &loop);
// Invoke the function.
Label call_proxy;
ParameterCount actual(rax);
__ SmiToInteger32(rax, rax);
__ movq(rdi, Operand(rbp, kFunctionOffset));
__ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
__ j(not_equal, &call_proxy);
__ InvokeFunction(rdi, actual, CALL_FUNCTION,
NullCallWrapper(), CALL_AS_METHOD);
frame_scope.GenerateLeaveFrame();
__ ret(3 * kPointerSize); // remove this, receiver, and arguments
// Invoke the function proxy.
__ bind(&call_proxy);
__ push(rdi); // add function proxy as last argument
__ incq(rax);
__ Set(rbx, 0);
__ SetCallKind(rcx, CALL_AS_METHOD);
__ GetBuiltinEntry(rdx, Builtins::CALL_FUNCTION_PROXY);
__ call(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
// Leave internal frame.
}
__ ret(3 * kPointerSize); // remove this, receiver, and arguments
}
void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -----------------------------------
Label generic_array_code;
// Get the InternalArray function.
__ LoadGlobalFunction(Context::INTERNAL_ARRAY_FUNCTION_INDEX, rdi);
if (FLAG_debug_code) {
// Initial map for the builtin InternalArray functions should be maps.
__ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
STATIC_ASSERT(kSmiTag == 0);
Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
__ Check(not_smi, kUnexpectedInitialMapForInternalArrayFunction);
__ CmpObjectType(rbx, MAP_TYPE, rcx);
__ Check(equal, kUnexpectedInitialMapForInternalArrayFunction);
}
// Run the native code for the InternalArray function called as a normal
// function.
// tail call a stub
InternalArrayConstructorStub stub(masm->isolate());
__ TailCallStub(&stub);
}
void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -----------------------------------
Label generic_array_code;
// Get the Array function.
__ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rdi);
if (FLAG_debug_code) {
// Initial map for the builtin Array functions should be maps.
__ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
STATIC_ASSERT(kSmiTag == 0);
Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
__ Check(not_smi, kUnexpectedInitialMapForArrayFunction);
__ CmpObjectType(rbx, MAP_TYPE, rcx);
__ Check(equal, kUnexpectedInitialMapForArrayFunction);
}
// Run the native code for the Array function called as a normal function.
// tail call a stub
Handle<Object> undefined_sentinel(
masm->isolate()->heap()->undefined_value(),
masm->isolate());
__ Move(rbx, undefined_sentinel);
ArrayConstructorStub stub(masm->isolate());
__ TailCallStub(&stub);
}
void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : number of arguments
// -- rdi : constructor function
// -- rsp[0] : return address
// -- rsp[(argc - n) * 8] : arg[n] (zero-based)
// -- rsp[(argc + 1) * 8] : receiver
// -----------------------------------
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->string_ctor_calls(), 1);
if (FLAG_debug_code) {
__ LoadGlobalFunction(Context::STRING_FUNCTION_INDEX, rcx);
__ cmpq(rdi, rcx);
__ Assert(equal, kUnexpectedStringFunction);
}
// Load the first argument into rax and get rid of the rest
// (including the receiver).
StackArgumentsAccessor args(rsp, rax);
Label no_arguments;
__ testq(rax, rax);
__ j(zero, &no_arguments);
__ movq(rbx, args.GetArgumentOperand(1));
__ PopReturnAddressTo(rcx);
__ lea(rsp, Operand(rsp, rax, times_pointer_size, kPointerSize));
__ PushReturnAddressFrom(rcx);
__ movq(rax, rbx);
// Lookup the argument in the number to string cache.
Label not_cached, argument_is_string;
__ LookupNumberStringCache(rax, // Input.
rbx, // Result.
rcx, // Scratch 1.
rdx, // Scratch 2.
¬_cached);
__ IncrementCounter(counters->string_ctor_cached_number(), 1);
__ bind(&argument_is_string);
// ----------- S t a t e -------------
// -- rbx : argument converted to string
// -- rdi : constructor function
// -- rsp[0] : return address
// -----------------------------------
// Allocate a JSValue and put the tagged pointer into rax.
Label gc_required;
__ Allocate(JSValue::kSize,
rax, // Result.
rcx, // New allocation top (we ignore it).
no_reg,
&gc_required,
TAG_OBJECT);
// Set the map.
__ LoadGlobalFunctionInitialMap(rdi, rcx);
if (FLAG_debug_code) {
__ cmpb(FieldOperand(rcx, Map::kInstanceSizeOffset),
Immediate(JSValue::kSize >> kPointerSizeLog2));
__ Assert(equal, kUnexpectedStringWrapperInstanceSize);
__ cmpb(FieldOperand(rcx, Map::kUnusedPropertyFieldsOffset), Immediate(0));
__ Assert(equal, kUnexpectedUnusedPropertiesOfStringWrapper);
}
__ movq(FieldOperand(rax, HeapObject::kMapOffset), rcx);
// Set properties and elements.
__ LoadRoot(rcx, Heap::kEmptyFixedArrayRootIndex);
__ movq(FieldOperand(rax, JSObject::kPropertiesOffset), rcx);
__ movq(FieldOperand(rax, JSObject::kElementsOffset), rcx);
// Set the value.
__ movq(FieldOperand(rax, JSValue::kValueOffset), rbx);
// Ensure the object is fully initialized.
STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
// We're done. Return.
__ ret(0);
// The argument was not found in the number to string cache. Check
// if it's a string already before calling the conversion builtin.
Label convert_argument;
__ bind(¬_cached);
STATIC_ASSERT(kSmiTag == 0);
__ JumpIfSmi(rax, &convert_argument);
Condition is_string = masm->IsObjectStringType(rax, rbx, rcx);
__ j(NegateCondition(is_string), &convert_argument);
__ movq(rbx, rax);
__ IncrementCounter(counters->string_ctor_string_value(), 1);
__ jmp(&argument_is_string);
// Invoke the conversion builtin and put the result into rbx.
__ bind(&convert_argument);
__ IncrementCounter(counters->string_ctor_conversions(), 1);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(rdi); // Preserve the function.
__ push(rax);
__ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);
__ pop(rdi);
}
__ movq(rbx, rax);
__ jmp(&argument_is_string);
// Load the empty string into rbx, remove the receiver from the
// stack, and jump back to the case where the argument is a string.
__ bind(&no_arguments);
__ LoadRoot(rbx, Heap::kempty_stringRootIndex);
__ PopReturnAddressTo(rcx);
__ lea(rsp, Operand(rsp, kPointerSize));
__ PushReturnAddressFrom(rcx);
__ jmp(&argument_is_string);
// At this point the argument is already a string. Call runtime to
// create a string wrapper.
__ bind(&gc_required);
__ IncrementCounter(counters->string_ctor_gc_required(), 1);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(rbx);
__ CallRuntime(Runtime::kNewStringWrapper, 1);
}
__ ret(0);
}
static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
__ push(rbp);
__ movq(rbp, rsp);
// Store the arguments adaptor context sentinel.
__ Push(Smi::FromInt(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.
__ Integer32ToSmi(r8, rax);
__ push(r8);
}
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);
__ pop(rbp);
// Remove caller arguments from the stack.
__ PopReturnAddressTo(rcx);
SmiIndex index = masm->SmiToIndex(rbx, rbx, kPointerSizeLog2);
__ lea(rsp, Operand(rsp, index.reg, index.scale, 1 * kPointerSize));
__ PushReturnAddressFrom(rcx);
}
void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : actual number of arguments
// -- rbx : expected number of arguments
// -- rcx : call kind information
// -- rdx : code entry to call
// -----------------------------------
Label invoke, dont_adapt_arguments;
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->arguments_adaptors(), 1);
Label enough, too_few;
__ cmpq(rax, rbx);
__ j(less, &too_few);
__ cmpq(rbx, Immediate(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
__ j(equal, &dont_adapt_arguments);
{ // Enough parameters: Actual >= expected.
__ bind(&enough);
EnterArgumentsAdaptorFrame(masm);
// Copy receiver and all expected arguments.
const int offset = StandardFrameConstants::kCallerSPOffset;
__ lea(rax, Operand(rbp, rax, times_pointer_size, offset));
__ Set(r8, -1); // account for receiver
Label copy;
__ bind(©);
__ incq(r8);
__ push(Operand(rax, 0));
__ subq(rax, Immediate(kPointerSize));
__ cmpq(r8, rbx);
__ j(less, ©);
__ jmp(&invoke);
}
{ // Too few parameters: Actual < expected.
__ bind(&too_few);
EnterArgumentsAdaptorFrame(masm);
// Copy receiver and all actual arguments.
const int offset = StandardFrameConstants::kCallerSPOffset;
__ lea(rdi, Operand(rbp, rax, times_pointer_size, offset));
__ Set(r8, -1); // account for receiver
Label copy;
__ bind(©);
__ incq(r8);
__ push(Operand(rdi, 0));
__ subq(rdi, Immediate(kPointerSize));
__ cmpq(r8, rax);
__ j(less, ©);
// Fill remaining expected arguments with undefined values.
Label fill;
__ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
__ bind(&fill);
__ incq(r8);
__ push(kScratchRegister);
__ cmpq(r8, rbx);
__ j(less, &fill);
// Restore function pointer.
__ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
}
// Call the entry point.
__ bind(&invoke);
__ call(rdx);
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(masm->pc_offset());
// Leave frame and return.
LeaveArgumentsAdaptorFrame(masm);
__ ret(0);
// -------------------------------------------
// Dont adapt arguments.
// -------------------------------------------
__ bind(&dont_adapt_arguments);
__ jmp(rdx);
}
void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
// Lookup the function in the JavaScript frame.
__ movq(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Lookup and calculate pc offset.
__ movq(rdx, Operand(rbp, StandardFrameConstants::kCallerPCOffset));
__ movq(rbx, FieldOperand(rax, JSFunction::kSharedFunctionInfoOffset));
__ subq(rdx, Immediate(Code::kHeaderSize - kHeapObjectTag));
__ subq(rdx, FieldOperand(rbx, SharedFunctionInfo::kCodeOffset));
__ Integer32ToSmi(rdx, rdx);
// Pass both function and pc offset as arguments.
__ push(rax);
__ push(rdx);
__ CallRuntime(Runtime::kCompileForOnStackReplacement, 2);
}
Label skip;
// If the code object is null, just return to the unoptimized code.
__ cmpq(rax, Immediate(0));
__ j(not_equal, &skip, Label::kNear);
__ ret(0);
__ bind(&skip);
// Load deoptimization data from the code object.
__ movq(rbx, Operand(rax, Code::kDeoptimizationDataOffset - kHeapObjectTag));
// Load the OSR entrypoint offset from the deoptimization data.
__ SmiToInteger32(rbx, Operand(rbx, FixedArray::OffsetOfElementAt(
DeoptimizationInputData::kOsrPcOffsetIndex) - kHeapObjectTag));
// Compute the target address = code_obj + header_size + osr_offset
__ lea(rax, Operand(rax, rbx, times_1, Code::kHeaderSize - kHeapObjectTag));
// Overwrite the return address on the stack.
__ movq(Operand(rsp, 0), rax);
// And "return" to the OSR entry point of the function.
__ ret(0);
}
void Builtins::Generate_OsrAfterStackCheck(MacroAssembler* masm) {
// We check the stack limit as indicator that recompilation might be done.
Label ok;
__ CompareRoot(rsp, Heap::kStackLimitRootIndex);
__ j(above_equal, &ok);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kStackGuard, 0);
}
__ jmp(masm->isolate()->builtins()->OnStackReplacement(),
RelocInfo::CODE_TARGET);
__ bind(&ok);
__ ret(0);
}
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_X64