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chromium / v8 / v8 / a2d5641bc42f561117ed77c28fe672d33581a4ca / . / src / mips / builtins-mips.cc
blob: f106a43a6ec2c8bca03fdb67a0eb47cce0a35666 [file] [log] [blame]
// 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_MIPS
#include "src/codegen.h"
#include "src/debug/debug.h"
#include "src/deoptimizer.h"
#include "src/full-codegen/full-codegen.h"
#include "src/runtime/runtime.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 -------------
// -- a0 : number of arguments excluding receiver
// -- a1 : target
// -- a3 : new.target
// -- sp[0] : last argument
// -- ...
// -- sp[4 * (argc - 1)] : first argument
// -- sp[4 * agrc] : receiver
// -----------------------------------
__ AssertFunction(a1);
// Insert extra arguments.
int num_extra_args = 0;
switch (extra_args) {
case BuiltinExtraArguments::kTarget:
__ Push(a1);
++num_extra_args;
break;
case BuiltinExtraArguments::kNewTarget:
__ Push(a3);
++num_extra_args;
break;
case BuiltinExtraArguments::kTargetAndNewTarget:
__ Push(a1, a3);
num_extra_args += 2;
break;
case BuiltinExtraArguments::kNone:
break;
}
// JumpToExternalReference expects a0 to contain the number of arguments
// including the receiver and the extra arguments.
__ Addu(a0, a0, num_extra_args + 1);
__ JumpToExternalReference(ExternalReference(id, masm->isolate()));
}
// Load the built-in InternalArray function from the current context.
static void GenerateLoadInternalArrayFunction(MacroAssembler* masm,
Register result) {
// Load the InternalArray function from the native context.
__ LoadNativeContextSlot(Context::INTERNAL_ARRAY_FUNCTION_INDEX, result);
}
// Load the built-in Array function from the current context.
static void GenerateLoadArrayFunction(MacroAssembler* masm, Register result) {
// Load the Array function from the native context.
__ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, result);
}
void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : number of arguments
// -- ra : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Label generic_array_code, one_or_more_arguments, two_or_more_arguments;
// Get the InternalArray function.
GenerateLoadInternalArrayFunction(masm, a1);
if (FLAG_debug_code) {
// Initial map for the builtin InternalArray functions should be maps.
__ lw(a2, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
__ SmiTst(a2, t0);
__ Assert(ne, kUnexpectedInitialMapForInternalArrayFunction,
t0, Operand(zero_reg));
__ GetObjectType(a2, a3, t0);
__ Assert(eq, kUnexpectedInitialMapForInternalArrayFunction,
t0, Operand(MAP_TYPE));
}
// 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 -------------
// -- a0 : number of arguments
// -- ra : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Label generic_array_code;
// Get the Array function.
GenerateLoadArrayFunction(masm, a1);
if (FLAG_debug_code) {
// Initial map for the builtin Array functions should be maps.
__ lw(a2, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
__ SmiTst(a2, t0);
__ Assert(ne, kUnexpectedInitialMapForArrayFunction1,
t0, Operand(zero_reg));
__ GetObjectType(a2, a3, t0);
__ Assert(eq, kUnexpectedInitialMapForArrayFunction2,
t0, Operand(MAP_TYPE));
}
// Run the native code for the Array function called as a normal function.
// Tail call a stub.
__ mov(a3, a1);
__ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
ArrayConstructorStub stub(masm->isolate());
__ TailCallStub(&stub);
}
// static
void Builtins::Generate_StringConstructor(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : number of arguments
// -- a1 : constructor function
// -- ra : return address
// -- sp[(argc - n - 1) * 4] : arg[n] (zero based)
// -- sp[argc * 4] : receiver
// -----------------------------------
// 1. Load the first argument into a0 and get rid of the rest (including the
// receiver).
Label no_arguments;
{
__ Branch(USE_DELAY_SLOT, &no_arguments, eq, a0, Operand(zero_reg));
__ Subu(a0, a0, Operand(1));
__ sll(a0, a0, kPointerSizeLog2);
__ Addu(sp, a0, sp);
__ lw(a0, MemOperand(sp));
__ Drop(2);
}
// 2a. At least one argument, return a0 if it's a string, otherwise
// dispatch to appropriate conversion.
Label to_string, symbol_descriptive_string;
{
__ JumpIfSmi(a0, &to_string);
__ GetObjectType(a0, a1, a1);
STATIC_ASSERT(FIRST_NONSTRING_TYPE == SYMBOL_TYPE);
__ Subu(a1, a1, Operand(FIRST_NONSTRING_TYPE));
__ Branch(&symbol_descriptive_string, eq, a1, Operand(zero_reg));
__ Branch(&to_string, gt, a1, Operand(zero_reg));
__ Ret(USE_DELAY_SLOT);
__ mov(v0, a0);
}
// 2b. No arguments, return the empty string (and pop the receiver).
__ bind(&no_arguments);
{
__ LoadRoot(v0, Heap::kempty_stringRootIndex);
__ DropAndRet(1);
}
// 3a. Convert a0 to a string.
__ bind(&to_string);
{
ToStringStub stub(masm->isolate());
__ TailCallStub(&stub);
}
// 3b. Convert symbol in a0 to a string.
__ bind(&symbol_descriptive_string);
{
__ Push(a0);
__ TailCallRuntime(Runtime::kSymbolDescriptiveString, 1, 1);
}
}
// static
void Builtins::Generate_StringConstructor_ConstructStub(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : number of arguments
// -- a1 : constructor function
// -- a3 : new target
// -- ra : return address
// -- sp[(argc - n - 1) * 4] : arg[n] (zero based)
// -- sp[argc * 4] : receiver
// -----------------------------------
// 1. Load the first argument into a0 and get rid of the rest (including the
// receiver).
{
Label no_arguments, done;
__ Branch(USE_DELAY_SLOT, &no_arguments, eq, a0, Operand(zero_reg));
__ Subu(a0, a0, Operand(1));
__ sll(a0, a0, kPointerSizeLog2);
__ Addu(sp, a0, sp);
__ lw(a0, MemOperand(sp));
__ Drop(2);
__ jmp(&done);
__ bind(&no_arguments);
__ LoadRoot(a0, Heap::kempty_stringRootIndex);
__ Drop(1);
__ bind(&done);
}
// 2. Make sure a0 is a string.
{
Label convert, done_convert;
__ JumpIfSmi(a0, &convert);
__ GetObjectType(a0, a2, a2);
__ And(t0, a2, Operand(kIsNotStringMask));
__ Branch(&done_convert, eq, t0, Operand(zero_reg));
__ bind(&convert);
{
FrameScope scope(masm, StackFrame::INTERNAL);
ToStringStub stub(masm->isolate());
__ Push(a1, a3);
__ CallStub(&stub);
__ Move(a0, v0);
__ Pop(a1, a3);
}
__ bind(&done_convert);
}
// 3. Check if new target and constructor differ.
Label new_object;
__ Branch(&new_object, ne, a1, Operand(a3));
// 4. Allocate a JSValue wrapper for the string.
{
// ----------- S t a t e -------------
// -- a0 : the first argument
// -- a1 : constructor function
// -- a3 : new target
// -- ra : return address
// -----------------------------------
__ Allocate(JSValue::kSize, v0, a2, t0, &new_object, TAG_OBJECT);
// Initialize the JSValue in eax.
__ LoadGlobalFunctionInitialMap(a1, a2, a3);
__ sw(a2, FieldMemOperand(v0, HeapObject::kMapOffset));
__ LoadRoot(a3, Heap::kEmptyFixedArrayRootIndex);
__ sw(a3, FieldMemOperand(v0, JSObject::kPropertiesOffset));
__ sw(a3, FieldMemOperand(v0, JSObject::kElementsOffset));
__ Ret(USE_DELAY_SLOT);
__ sw(a0, FieldMemOperand(v0, JSValue::kValueOffset));
STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
}
// 5. Fallback to the runtime to create new object.
__ bind(&new_object);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(a0, a1, a3); // first argument, constructor, new target
__ CallRuntime(Runtime::kNewObject, 2);
__ Pop(a0);
}
__ Ret(USE_DELAY_SLOT);
__ sw(a0, FieldMemOperand(v0, JSValue::kValueOffset));
}
static void CallRuntimePassFunction(
MacroAssembler* masm, Runtime::FunctionId function_id) {
// ----------- S t a t e -------------
// -- a1 : target function (preserved for callee)
// -- a3 : new target (preserved for callee)
// -----------------------------------
FrameScope scope(masm, StackFrame::INTERNAL);
// Push a copy of the target function and the new target.
// Push function as parameter to the runtime call.
__ Push(a1, a3, a1);
__ CallRuntime(function_id, 1);
// Restore target function and new target.
__ Pop(a1, a3);
}
static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
__ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(a2, FieldMemOperand(a2, SharedFunctionInfo::kCodeOffset));
__ Addu(at, a2, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(at);
}
static void GenerateTailCallToReturnedCode(MacroAssembler* masm) {
__ Addu(at, v0, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(at);
}
void Builtins::Generate_InOptimizationQueue(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;
__ LoadRoot(t0, Heap::kStackLimitRootIndex);
__ Branch(&ok, hs, sp, Operand(t0));
CallRuntimePassFunction(masm, Runtime::kTryInstallOptimizedCode);
GenerateTailCallToReturnedCode(masm);
__ bind(&ok);
GenerateTailCallToSharedCode(masm);
}
static void Generate_JSConstructStubHelper(MacroAssembler* masm,
bool is_api_function,
bool create_implicit_receiver) {
// ----------- S t a t e -------------
// -- a0 : number of arguments
// -- a1 : constructor function
// -- a2 : allocation site or undefined
// -- a3 : new target
// -- ra : return address
// -- sp[...]: constructor arguments
// -----------------------------------
Isolate* isolate = masm->isolate();
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the incoming parameters on the stack.
__ AssertUndefinedOrAllocationSite(a2, t0);
__ SmiTag(a0);
__ Push(a2, a0);
if (create_implicit_receiver) {
// 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) {
// Verify that the new target is a JSFunction.
__ GetObjectType(a3, t1, t0);
__ Branch(&rt_call, ne, t0, Operand(JS_FUNCTION_TYPE));
// Load the initial map and verify that it is in fact a map.
// a3: new target
__ lw(a2,
FieldMemOperand(a3, JSFunction::kPrototypeOrInitialMapOffset));
__ JumpIfSmi(a2, &rt_call);
__ GetObjectType(a2, t5, t4);
__ Branch(&rt_call, ne, t4, Operand(MAP_TYPE));
// Fall back to runtime if the expected base constructor and base
// constructor differ.
__ lw(t1, FieldMemOperand(a2, Map::kConstructorOrBackPointerOffset));
__ Branch(&rt_call, ne, a1, Operand(t1));
// 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.
// a1: constructor function
// a2: initial map
__ lbu(t5, FieldMemOperand(a2, Map::kInstanceTypeOffset));
__ Branch(&rt_call, eq, t5, Operand(JS_FUNCTION_TYPE));
// Now allocate the JSObject on the heap.
// a1: constructor function
// a2: initial map
// a3: new target
__ lbu(t3, FieldMemOperand(a2, Map::kInstanceSizeOffset));
__ Allocate(t3, t4, t3, t6, &rt_call, SIZE_IN_WORDS);
// Allocated the JSObject, now initialize the fields. Map is set to
// initial map and properties and elements are set to empty fixed array.
// a1: constructor function
// a2: initial map
// a3: new target
// t4: JSObject (not HeapObject tagged - the actual address).
// t3: start of next object
__ LoadRoot(t6, Heap::kEmptyFixedArrayRootIndex);
__ mov(t5, t4);
STATIC_ASSERT(0 * kPointerSize == JSObject::kMapOffset);
__ sw(a2, MemOperand(t5, JSObject::kMapOffset));
STATIC_ASSERT(1 * kPointerSize == JSObject::kPropertiesOffset);
__ sw(t6, MemOperand(t5, JSObject::kPropertiesOffset));
STATIC_ASSERT(2 * kPointerSize == JSObject::kElementsOffset);
__ sw(t6, MemOperand(t5, JSObject::kElementsOffset));
STATIC_ASSERT(3 * kPointerSize == JSObject::kHeaderSize);
__ Addu(t5, t5, Operand(3 * kPointerSize));
// 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.
__ Addu(t4, t4, Operand(kHeapObjectTag));
// Fill all the in-object properties with appropriate filler.
// t4: JSObject (tagged)
// t5: First in-object property of JSObject (not tagged)
__ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
if (!is_api_function) {
Label no_inobject_slack_tracking;
MemOperand bit_field3 = FieldMemOperand(a2, Map::kBitField3Offset);
// Check if slack tracking is enabled.
__ lw(t0, bit_field3);
__ DecodeField<Map::ConstructionCounter>(t2, t0);
// t2: slack tracking counter
__ Branch(&no_inobject_slack_tracking, lt, t2,
Operand(Map::kSlackTrackingCounterEnd));
// Decrease generous allocation count.
__ Subu(t0, t0, Operand(1 << Map::ConstructionCounter::kShift));
__ sw(t0, bit_field3);
// Allocate object with a slack.
__ lbu(a0, FieldMemOperand(a2, Map::kUnusedPropertyFieldsOffset));
__ sll(a0, a0, kPointerSizeLog2);
__ subu(a0, t3, a0);
// a0: offset of first field after pre-allocated fields
if (FLAG_debug_code) {
__ Assert(le, kUnexpectedNumberOfPreAllocatedPropertyFields, t5,
Operand(a0));
}
__ InitializeFieldsWithFiller(t5, a0, t7);
// To allow truncation fill the remaining fields with one pointer
// filler map.
__ LoadRoot(t7, Heap::kOnePointerFillerMapRootIndex);
__ InitializeFieldsWithFiller(t5, t3, t7);
// t2: slack tracking counter value before decreasing.
__ Branch(&allocated, ne, t2, Operand(Map::kSlackTrackingCounterEnd));
// Push the constructor, new_target and the object to the stack,
// and then the initial map as an argument to the runtime call.
__ Push(a1, a3, t4, a2);
__ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
__ Pop(a1, a3, t4);
// Continue with JSObject being successfully allocated.
// a1: constructor function
// a3: new target
// t4: JSObject
__ jmp(&allocated);
__ bind(&no_inobject_slack_tracking);
}
__ InitializeFieldsWithFiller(t5, t3, t7);
// Continue with JSObject being successfully allocated.
// a1: constructor function
// a3: new target
// t4: JSObject
__ jmp(&allocated);
}
// Allocate the new receiver object using the runtime call.
// a1: constructor function
// a3: new target
__ bind(&rt_call);
// Push the constructor and new_target twice, second pair as arguments
// to the runtime call.
__ Push(a1, a3, a1, a3); // constructor function, new target
__ CallRuntime(Runtime::kNewObject, 2);
__ mov(t4, v0);
__ Pop(a1, a3);
// Receiver for constructor call allocated.
// a1: constructor function
// a3: new target
// t4: JSObject
__ bind(&allocated);
// Retrieve smi-tagged arguments count from the stack.
__ lw(a0, MemOperand(sp));
}
__ SmiUntag(a0);
if (create_implicit_receiver) {
// 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(t4, t4);
} else {
__ PushRoot(Heap::kTheHoleValueRootIndex);
}
// Set up pointer to last argument.
__ Addu(a2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
// Copy arguments and receiver to the expression stack.
// a0: number of arguments
// a1: constructor function
// a2: address of last argument (caller sp)
// a3: new target
// t4: number of arguments (smi-tagged)
// sp[0]: receiver
// sp[1]: receiver
// sp[2]: number of arguments (smi-tagged)
Label loop, entry;
__ SmiTag(t4, a0);
__ jmp(&entry);
__ bind(&loop);
__ sll(t0, t4, kPointerSizeLog2 - kSmiTagSize);
__ Addu(t0, a2, Operand(t0));
__ lw(t1, MemOperand(t0));
__ push(t1);
__ bind(&entry);
__ Addu(t4, t4, Operand(-2));
__ Branch(&loop, greater_equal, t4, Operand(zero_reg));
// Call the function.
// a0: number of arguments
// a1: constructor function
// a3: new target
if (is_api_function) {
__ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
Handle<Code> code =
masm->isolate()->builtins()->HandleApiCallConstruct();
__ Call(code, RelocInfo::CODE_TARGET);
} else {
ParameterCount actual(a0);
__ InvokeFunction(a1, a3, actual, CALL_FUNCTION,
CheckDebugStepCallWrapper());
}
// Store offset of return address for deoptimizer.
if (create_implicit_receiver && !is_api_function) {
masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
}
// Restore context from the frame.
__ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
if (create_implicit_receiver) {
// 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.
// v0: result
// sp[0]: receiver (newly allocated object)
// sp[1]: number of arguments (smi-tagged)
__ JumpIfSmi(v0, &use_receiver);
// If the type of the result (stored in its map) is less than
// FIRST_JS_RECEIVER_TYPE, it is not an object in the ECMA sense.
__ GetObjectType(v0, a1, a3);
__ Branch(&exit, greater_equal, a3, Operand(FIRST_JS_RECEIVER_TYPE));
// Throw away the result of the constructor invocation and use the
// on-stack receiver as the result.
__ bind(&use_receiver);
__ lw(v0, MemOperand(sp));
// Remove receiver from the stack, remove caller arguments, and
// return.
__ bind(&exit);
// v0: result
// sp[0]: receiver (newly allocated object)
// sp[1]: number of arguments (smi-tagged)
__ lw(a1, MemOperand(sp, 1 * kPointerSize));
} else {
__ lw(a1, MemOperand(sp));
}
// Leave construct frame.
}
__ sll(t0, a1, kPointerSizeLog2 - 1);
__ Addu(sp, sp, t0);
__ Addu(sp, sp, kPointerSize);
if (create_implicit_receiver) {
__ IncrementCounter(isolate->counters()->constructed_objects(), 1, a1, a2);
}
__ Ret();
}
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, true);
}
void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, true, true);
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, false);
}
void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(a1);
__ CallRuntime(Runtime::kThrowConstructedNonConstructable, 1);
}
enum IsTagged { kArgcIsSmiTagged, kArgcIsUntaggedInt };
// Clobbers a2; preserves all other registers.
static void Generate_CheckStackOverflow(MacroAssembler* masm, Register argc,
IsTagged argc_is_tagged) {
// 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(a2, Heap::kRealStackLimitRootIndex);
// Make a2 the space we have left. The stack might already be overflowed
// here which will cause r2 to become negative.
__ Subu(a2, sp, a2);
// Check if the arguments will overflow the stack.
if (argc_is_tagged == kArgcIsSmiTagged) {
__ sll(t3, argc, kPointerSizeLog2 - kSmiTagSize);
} else {
DCHECK(argc_is_tagged == kArgcIsUntaggedInt);
__ sll(t3, argc, kPointerSizeLog2);
}
// Signed comparison.
__ Branch(&okay, gt, a2, Operand(t3));
// Out of stack space.
__ CallRuntime(Runtime::kThrowStackOverflow, 0);
__ bind(&okay);
}
static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
bool is_construct) {
// Called from JSEntryStub::GenerateBody
// ----------- S t a t e -------------
// -- a0: new.target
// -- a1: function
// -- a2: receiver_pointer
// -- a3: argc
// -- s0: argv
// -----------------------------------
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// Clear the context before we push it when entering the JS frame.
__ mov(cp, zero_reg);
// 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(Isolate::kContextAddress,
masm->isolate());
__ li(cp, Operand(context_address));
__ lw(cp, MemOperand(cp));
// Push the function and the receiver onto the stack.
__ Push(a1, a2);
// Check if we have enough stack space to push all arguments.
// Clobbers a2.
Generate_CheckStackOverflow(masm, a3, kArgcIsUntaggedInt);
// Remember new.target.
__ mov(t1, a0);
// Copy arguments to the stack in a loop.
// a3: argc
// s0: argv, i.e. points to first arg
Label loop, entry;
__ sll(t0, a3, kPointerSizeLog2);
__ addu(t2, s0, t0);
__ b(&entry);
__ nop(); // Branch delay slot nop.
// t2 points past last arg.
__ bind(&loop);
__ lw(t0, MemOperand(s0)); // Read next parameter.
__ addiu(s0, s0, kPointerSize);
__ lw(t0, MemOperand(t0)); // Dereference handle.
__ push(t0); // Push parameter.
__ bind(&entry);
__ Branch(&loop, ne, s0, Operand(t2));
// Setup new.target and argc.
__ mov(a0, a3);
__ mov(a3, t1);
// Initialize all JavaScript callee-saved registers, since they will be seen
// by the garbage collector as part of handlers.
__ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
__ mov(s1, t0);
__ mov(s2, t0);
__ mov(s3, t0);
__ mov(s4, t0);
__ mov(s5, t0);
// s6 holds the root address. Do not clobber.
// s7 is cp. Do not init.
// Invoke the code.
Handle<Code> builtin = is_construct
? masm->isolate()->builtins()->Construct()
: masm->isolate()->builtins()->Call();
__ Call(builtin, RelocInfo::CODE_TARGET);
// Leave internal frame.
}
__ Jump(ra);
}
void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, false);
}
void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
Generate_JSEntryTrampolineHelper(masm, true);
}
// 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 a1: the JS function object being called.
// o a3: the new target
// o cp: our context
// o fp: the caller's frame pointer
// o sp: stack pointer
// o ra: return address
//
// The function builds a JS frame. Please see JavaScriptFrameConstants in
// frames-mips.h for its layout.
// TODO(rmcilroy): We will need to include the current bytecode pointer in the
// frame.
void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
// Open a frame scope to indicate that there is a frame on the stack. The
// MANUAL indicates that the scope shouldn't actually generate code to set up
// the frame (that is done below).
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ Push(ra, fp, cp, a1);
__ Addu(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
__ Push(a3);
// Get the bytecode array from the function object and load the pointer to the
// first entry into kInterpreterBytecodeRegister.
__ lw(a0, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(kInterpreterBytecodeArrayRegister,
FieldMemOperand(a0, SharedFunctionInfo::kFunctionDataOffset));
if (FLAG_debug_code) {
// Check function data field is actually a BytecodeArray object.
__ SmiTst(kInterpreterBytecodeArrayRegister, t0);
__ Assert(ne, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry, t0,
Operand(zero_reg));
__ GetObjectType(kInterpreterBytecodeArrayRegister, t0, t0);
__ Assert(eq, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry, t0,
Operand(BYTECODE_ARRAY_TYPE));
}
// Allocate the local and temporary register file on the stack.
{
// Load frame size from the BytecodeArray object.
__ lw(t0, FieldMemOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kFrameSizeOffset));
// Do a stack check to ensure we don't go over the limit.
Label ok;
__ Subu(t1, sp, Operand(t0));
__ LoadRoot(a2, Heap::kRealStackLimitRootIndex);
__ Branch(&ok, hs, t1, Operand(a2));
__ CallRuntime(Runtime::kThrowStackOverflow, 0);
__ bind(&ok);
// If ok, push undefined as the initial value for all register file entries.
Label loop_header;
Label loop_check;
__ LoadRoot(t1, Heap::kUndefinedValueRootIndex);
__ Branch(&loop_check);
__ bind(&loop_header);
// TODO(rmcilroy): Consider doing more than one push per loop iteration.
__ push(t1);
// Continue loop if not done.
__ bind(&loop_check);
__ Subu(t0, t0, Operand(kPointerSize));
__ Branch(&loop_header, ge, t0, Operand(zero_reg));
}
// TODO(rmcilroy): List of things not currently dealt with here but done in
// fullcodegen's prologue:
// - Support profiler (specifically profiling_counter).
// - Call ProfileEntryHookStub when isolate has a function_entry_hook.
// - Allow simulator stop operations if FLAG_stop_at is set.
// - Code aging of the BytecodeArray object.
// Perform stack guard check.
{
Label ok;
__ LoadRoot(at, Heap::kStackLimitRootIndex);
__ Branch(&ok, hs, sp, Operand(at));
__ push(kInterpreterBytecodeArrayRegister);
__ CallRuntime(Runtime::kStackGuard, 0);
__ pop(kInterpreterBytecodeArrayRegister);
__ bind(&ok);
}
// Load bytecode offset and dispatch table into registers.
__ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
__ Subu(kInterpreterRegisterFileRegister, fp,
Operand(2 * kPointerSize +
StandardFrameConstants::kFixedFrameSizeFromFp));
__ li(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
__ LoadRoot(kInterpreterDispatchTableRegister,
Heap::kInterpreterTableRootIndex);
__ Addu(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
Operand(FixedArray::kHeaderSize - kHeapObjectTag));
// Dispatch to the first bytecode handler for the function.
__ Addu(a0, kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister);
__ lbu(a0, MemOperand(a0));
__ sll(at, a0, kPointerSizeLog2);
__ Addu(at, kInterpreterDispatchTableRegister, at);
__ lw(at, MemOperand(at));
// TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
// and header removal.
__ Addu(at, at, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Call(at);
}
void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
// TODO(rmcilroy): List of things not currently dealt with here but done in
// fullcodegen's EmitReturnSequence.
// - Supporting FLAG_trace for Runtime::TraceExit.
// - Support profiler (specifically decrementing profiling_counter
// appropriately and calling out to HandleInterrupts if necessary).
// The return value is in accumulator, which is already in v0.
// Leave the frame (also dropping the register file).
__ LeaveFrame(StackFrame::JAVA_SCRIPT);
// Drop receiver + arguments and return.
__ lw(at, FieldMemOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kParameterSizeOffset));
__ Addu(sp, sp, at);
__ Jump(ra);
}
// static
void Builtins::Generate_InterpreterPushArgsAndCall(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a2 : 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.
// -- a1 : the target to call (can be any Object).
// -----------------------------------
// Find the address of the last argument.
__ Addu(a3, a0, Operand(1)); // Add one for receiver.
__ sll(a3, a3, kPointerSizeLog2);
__ Subu(a3, a2, Operand(a3));
// Push the arguments.
Label loop_header, loop_check;
__ Branch(&loop_check);
__ bind(&loop_header);
__ lw(t0, MemOperand(a2));
__ Addu(a2, a2, Operand(-kPointerSize));
__ push(t0);
__ bind(&loop_check);
__ Branch(&loop_header, gt, a2, Operand(a3));
// Call the target.
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_InterpreterPushArgsAndConstruct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : argument count (not including receiver)
// -- a3 : new target
// -- a1 : constructor to call
// -- a2 : address of the first argument
// -----------------------------------
// Find the address of the last argument.
__ sll(t0, a0, kPointerSizeLog2);
__ Subu(t0, a2, Operand(t0));
// Push a slot for the receiver.
__ push(zero_reg);
// Push the arguments.
Label loop_header, loop_check;
__ Branch(&loop_check);
__ bind(&loop_header);
__ lw(t1, MemOperand(a2));
__ Addu(a2, a2, Operand(-kPointerSize));
__ push(t1);
__ bind(&loop_check);
__ Branch(&loop_header, gt, a2, Operand(t0));
// Call the constructor with a0, a1, and a3 unmodified.
__ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
}
void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
CallRuntimePassFunction(masm, Runtime::kCompileLazy);
GenerateTailCallToReturnedCode(masm);
}
void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
CallRuntimePassFunction(masm, Runtime::kCompileOptimized_NotConcurrent);
GenerateTailCallToReturnedCode(masm);
}
void Builtins::Generate_CompileOptimizedConcurrent(MacroAssembler* masm) {
CallRuntimePassFunction(masm, Runtime::kCompileOptimized_Concurrent);
GenerateTailCallToReturnedCode(masm);
}
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.
// Set a0 to point to the head of the PlatformCodeAge sequence.
__ Subu(a0, a0,
Operand(kNoCodeAgeSequenceLength - Assembler::kInstrSize));
// The following registers must be saved and restored when calling through to
// the runtime:
// a0 - contains return address (beginning of patch sequence)
// a1 - isolate
// a3 - new target
RegList saved_regs =
(a0.bit() | a1.bit() | a3.bit() | ra.bit() | fp.bit()) & ~sp.bit();
FrameScope scope(masm, StackFrame::MANUAL);
__ MultiPush(saved_regs);
__ PrepareCallCFunction(2, 0, a2);
__ li(a1, Operand(ExternalReference::isolate_address(masm->isolate())));
__ CallCFunction(
ExternalReference::get_make_code_young_function(masm->isolate()), 2);
__ MultiPop(saved_regs);
__ Jump(a0);
}
#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.
// Set a0 to point to the head of the PlatformCodeAge sequence.
__ Subu(a0, a0,
Operand(kNoCodeAgeSequenceLength - Assembler::kInstrSize));
// The following registers must be saved and restored when calling through to
// the runtime:
// a0 - contains return address (beginning of patch sequence)
// a1 - isolate
// a3 - new target
RegList saved_regs =
(a0.bit() | a1.bit() | a3.bit() | ra.bit() | fp.bit()) & ~sp.bit();
FrameScope scope(masm, StackFrame::MANUAL);
__ MultiPush(saved_regs);
__ PrepareCallCFunction(2, 0, a2);
__ li(a1, Operand(ExternalReference::isolate_address(masm->isolate())));
__ CallCFunction(
ExternalReference::get_mark_code_as_executed_function(masm->isolate()),
2);
__ MultiPop(saved_regs);
// Perform prologue operations usually performed by the young code stub.
__ Push(ra, fp, cp, a1);
__ Addu(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
// Jump to point after the code-age stub.
__ Addu(a0, a0, Operand(kNoCodeAgeSequenceLength));
__ Jump(a0);
}
void Builtins::Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm) {
GenerateMakeCodeYoungAgainCommon(masm);
}
void Builtins::Generate_MarkCodeAsToBeExecutedOnce(MacroAssembler* masm) {
Generate_MarkCodeAsExecutedOnce(masm);
}
static void Generate_NotifyStubFailureHelper(MacroAssembler* masm,
SaveFPRegsMode save_doubles) {
{
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.
__ MultiPush(kJSCallerSaved | kCalleeSaved);
// Pass the function and deoptimization type to the runtime system.
__ CallRuntime(Runtime::kNotifyStubFailure, 0, save_doubles);
__ MultiPop(kJSCallerSaved | kCalleeSaved);
}
__ Addu(sp, sp, Operand(kPointerSize)); // Ignore state
__ Jump(ra); // Jump to miss handler
}
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) {
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Pass the function and deoptimization type to the runtime system.
__ li(a0, Operand(Smi::FromInt(static_cast<int>(type))));
__ push(a0);
__ CallRuntime(Runtime::kNotifyDeoptimized, 1);
}
// Get the full codegen state from the stack and untag it -> t2.
__ lw(t2, MemOperand(sp, 0 * kPointerSize));
__ SmiUntag(t2);
// Switch on the state.
Label with_tos_register, unknown_state;
__ Branch(&with_tos_register,
ne, t2, Operand(FullCodeGenerator::NO_REGISTERS));
__ Ret(USE_DELAY_SLOT);
// Safe to fill delay slot Addu will emit one instruction.
__ Addu(sp, sp, Operand(1 * kPointerSize)); // Remove state.
__ bind(&with_tos_register);
__ lw(v0, MemOperand(sp, 1 * kPointerSize));
__ Branch(&unknown_state, ne, t2, Operand(FullCodeGenerator::TOS_REG));
__ Ret(USE_DELAY_SLOT);
// Safe to fill delay slot Addu will emit one instruction.
__ Addu(sp, sp, Operand(2 * kPointerSize)); // Remove state.
__ bind(&unknown_state);
__ stop("no cases left");
}
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);
}
// Clobbers {t2, t3, t4, t5}.
static void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
Register function_template_info,
Label* receiver_check_failed) {
Register signature = t2;
Register map = t3;
Register constructor = t4;
Register scratch = t5;
// If the receiver is not an object, jump to receiver_check_failed.
__ GetObjectType(receiver, map, scratch);
__ Branch(receiver_check_failed, lo, scratch, Operand(FIRST_JS_OBJECT_TYPE));
// If there is no signature, return the holder.
__ lw(signature, FieldMemOperand(function_template_info,
FunctionTemplateInfo::kSignatureOffset));
Label receiver_check_passed;
__ JumpIfRoot(signature, Heap::kUndefinedValueRootIndex,
&receiver_check_passed);
// Walk the prototype chain.
Label prototype_loop_start;
__ bind(&prototype_loop_start);
// End if the receiver is null or if it's a hidden type.
__ JumpIfRoot(receiver, Heap::kNullValueRootIndex, receiver_check_failed);
__ lw(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
__ lw(scratch, FieldMemOperand(map, Map::kBitField3Offset));
__ DecodeField<Map::IsHiddenPrototype>(scratch);
__ Branch(receiver_check_failed, ne, scratch, Operand(zero_reg));
// Get the constructor, if any.
__ GetMapConstructor(constructor, map, scratch, scratch);
Label next_prototype;
__ Branch(&next_prototype, ne, scratch, Operand(JS_FUNCTION_TYPE));
Register type = constructor;
__ lw(type,
FieldMemOperand(constructor, JSFunction::kSharedFunctionInfoOffset));
__ lw(type, FieldMemOperand(type, SharedFunctionInfo::kFunctionDataOffset));
// Loop through the chain of inheriting function templates.
Label function_template_loop;
__ bind(&function_template_loop);
// If the signatures match, we have a compatible receiver.
__ Branch(&receiver_check_passed, eq, signature, Operand(type),
USE_DELAY_SLOT);
// If the current type is not a FunctionTemplateInfo, load the next prototype
// in the chain.
__ JumpIfSmi(type, &next_prototype);
__ GetObjectType(type, scratch, scratch);
__ Branch(&next_prototype, ne, scratch, Operand(FUNCTION_TEMPLATE_INFO_TYPE));
// Otherwise load the parent function template and iterate.
__ lw(type,
FieldMemOperand(type, FunctionTemplateInfo::kParentTemplateOffset));
__ Branch(&function_template_loop);
// Load the next prototype and iterate.
__ bind(&next_prototype);
__ lw(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
__ Branch(&prototype_loop_start);
__ bind(&receiver_check_passed);
}
void Builtins::Generate_HandleFastApiCall(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : number of arguments excluding receiver
// -- a1 : callee
// -- ra : return address
// -- sp[0] : last argument
// -- ...
// -- sp[4 * (argc - 1)] : first argument
// -- sp[4 * argc] : receiver
// -----------------------------------
// Load the receiver.
__ sll(at, a0, kPointerSizeLog2);
__ Addu(t8, sp, at);
__ lw(t0, MemOperand(t8));
// Update the receiver if this is a contextual call.
Label set_global_proxy, valid_receiver;
__ JumpIfRoot(t0, Heap::kUndefinedValueRootIndex, &set_global_proxy);
// Load the FunctionTemplateInfo.
__ bind(&valid_receiver);
__ lw(t1, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(t1, FieldMemOperand(t1, SharedFunctionInfo::kFunctionDataOffset));
// Do the compatible receiver check.
Label receiver_check_failed;
CompatibleReceiverCheck(masm, t0, t1, &receiver_check_failed);
// Get the callback offset from the FunctionTemplateInfo, and jump to the
// beginning of the code.
__ lw(t2, FieldMemOperand(t1, FunctionTemplateInfo::kCallCodeOffset));
__ lw(t2, FieldMemOperand(t2, CallHandlerInfo::kFastHandlerOffset));
__ Addu(t2, t2, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(t2);
__ bind(&set_global_proxy);
__ LoadGlobalProxy(t0);
__ sw(t0, MemOperand(t8));
__ Branch(&valid_receiver);
// Compatible receiver check failed: throw an Illegal Invocation exception.
__ bind(&receiver_check_failed);
// Drop the arguments (including the receiver);
__ Addu(t8, t8, Operand(kPointerSize));
__ addu(sp, t8, zero_reg);
__ TailCallRuntime(Runtime::kThrowIllegalInvocation, 0, 1);
}
void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
// Lookup the function in the JavaScript frame.
__ lw(a0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Pass function as argument.
__ push(a0);
__ CallRuntime(Runtime::kCompileForOnStackReplacement, 1);
}
// If the code object is null, just return to the unoptimized code.
__ Ret(eq, v0, Operand(Smi::FromInt(0)));
// Load deoptimization data from the code object.
// <deopt_data> = <code>[#deoptimization_data_offset]
__ lw(a1, MemOperand(v0, Code::kDeoptimizationDataOffset - kHeapObjectTag));
// Load the OSR entrypoint offset from the deoptimization data.
// <osr_offset> = <deopt_data>[#header_size + #osr_pc_offset]
__ lw(a1, MemOperand(a1, FixedArray::OffsetOfElementAt(
DeoptimizationInputData::kOsrPcOffsetIndex) - kHeapObjectTag));
__ SmiUntag(a1);
// Compute the target address = code_obj + header_size + osr_offset
// <entry_addr> = <code_obj> + #header_size + <osr_offset>
__ addu(v0, v0, a1);
__ addiu(ra, v0, Code::kHeaderSize - kHeapObjectTag);
// And "return" to the OSR entry point of the function.
__ Ret();
}
void Builtins::Generate_OsrAfterStackCheck(MacroAssembler* masm) {
// We check the stack limit as indicator that recompilation might be done.
Label ok;
__ LoadRoot(at, Heap::kStackLimitRootIndex);
__ Branch(&ok, hs, sp, Operand(at));
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kStackGuard, 0);
}
__ Jump(masm->isolate()->builtins()->OnStackReplacement(),
RelocInfo::CODE_TARGET);
__ bind(&ok);
__ Ret();
}
// static
void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
// 1. Make sure we have at least one argument.
// a0: actual number of arguments
{
Label done;
__ Branch(&done, ne, a0, Operand(zero_reg));
__ PushRoot(Heap::kUndefinedValueRootIndex);
__ Addu(a0, a0, Operand(1));
__ bind(&done);
}
// 2. Get the function to call (passed as receiver) from the stack.
// a0: actual number of arguments
__ sll(at, a0, kPointerSizeLog2);
__ addu(at, sp, at);
__ lw(a1, MemOperand(at));
// 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.
// a0: actual number of arguments
// a1: function
{
Label loop;
// Calculate the copy start address (destination). Copy end address is sp.
__ sll(at, a0, kPointerSizeLog2);
__ addu(a2, sp, at);
__ bind(&loop);
__ lw(at, MemOperand(a2, -kPointerSize));
__ sw(at, MemOperand(a2));
__ Subu(a2, a2, Operand(kPointerSize));
__ Branch(&loop, ne, a2, Operand(sp));
// Adjust the actual number of arguments and remove the top element
// (which is a copy of the last argument).
__ Subu(a0, a0, Operand(1));
__ Pop();
}
// 4. Call the callable.
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
static void Generate_PushAppliedArguments(MacroAssembler* masm,
const int vectorOffset,
const int argumentsOffset,
const int indexOffset,
const int limitOffset) {
Label entry, loop;
Register receiver = LoadDescriptor::ReceiverRegister();
Register key = LoadDescriptor::NameRegister();
Register slot = LoadDescriptor::SlotRegister();
Register vector = LoadWithVectorDescriptor::VectorRegister();
__ lw(key, MemOperand(fp, indexOffset));
__ Branch(&entry);
// Load the current argument from the arguments array.
__ bind(&loop);
__ lw(receiver, MemOperand(fp, argumentsOffset));
// Use inline caching to speed up access to arguments.
int slot_index = TypeFeedbackVector::PushAppliedArgumentsIndex();
__ li(slot, Operand(Smi::FromInt(slot_index)));
__ lw(vector, MemOperand(fp, vectorOffset));
Handle<Code> ic =
KeyedLoadICStub(masm->isolate(), LoadICState(kNoExtraICState)).GetCode();
__ Call(ic, RelocInfo::CODE_TARGET);
__ push(v0);
// Use inline caching to access the arguments.
__ lw(key, MemOperand(fp, indexOffset));
__ Addu(key, key, Operand(1 << kSmiTagSize));
__ sw(key, MemOperand(fp, indexOffset));
// Test if the copy loop has finished copying all the elements from the
// arguments object.
__ bind(&entry);
__ lw(a1, MemOperand(fp, limitOffset));
__ Branch(&loop, ne, key, Operand(a1));
// On exit, the pushed arguments count is in a0, untagged
__ mov(a0, key);
__ SmiUntag(a0);
}
// Used by FunctionApply and ReflectApply
static void Generate_ApplyHelper(MacroAssembler* masm, bool targetIsArgument) {
const int kFormalParameters = targetIsArgument ? 3 : 2;
const int kStackSize = kFormalParameters + 1;
{
FrameScope frame_scope(masm, StackFrame::INTERNAL);
const int kArgumentsOffset = kFPOnStackSize + kPCOnStackSize;
const int kReceiverOffset = kArgumentsOffset + kPointerSize;
const int kFunctionOffset = kReceiverOffset + kPointerSize;
const int kVectorOffset =
InternalFrameConstants::kCodeOffset - 1 * kPointerSize;
// Push the vector.
__ lw(a1, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(a1, FieldMemOperand(a1, SharedFunctionInfo::kFeedbackVectorOffset));
__ Push(a1);
__ lw(a0, MemOperand(fp, kFunctionOffset)); // Get the function.
__ lw(a1, MemOperand(fp, kArgumentsOffset)); // Get the args array.
__ Push(a0, a1);
// Returns (in v0) number of arguments to copy to stack as Smi.
if (targetIsArgument) {
__ InvokeBuiltin(Context::REFLECT_APPLY_PREPARE_BUILTIN_INDEX,
CALL_FUNCTION);
} else {
__ InvokeBuiltin(Context::APPLY_PREPARE_BUILTIN_INDEX, CALL_FUNCTION);
}
// Returns the result in v0.
Generate_CheckStackOverflow(masm, v0, kArgcIsSmiTagged);
// Push current limit and index.
const int kIndexOffset = kVectorOffset - (2 * kPointerSize);
const int kLimitOffset = kVectorOffset - (1 * kPointerSize);
__ mov(a1, zero_reg);
__ lw(a2, MemOperand(fp, kReceiverOffset));
__ Push(v0, a1, a2); // limit, initial index and receiver.
// Copy all arguments from the array to the stack.
Generate_PushAppliedArguments(masm, kVectorOffset, kArgumentsOffset,
kIndexOffset, kLimitOffset);
// Call the callable.
// TODO(bmeurer): This should be a tail call according to ES6.
__ lw(a1, MemOperand(fp, kFunctionOffset));
__ Call(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
// Tear down the internal frame and remove function, receiver and args.
}
__ Ret(USE_DELAY_SLOT);
__ Addu(sp, sp, Operand(kStackSize * kPointerSize)); // In delay slot.
}
static void Generate_ConstructHelper(MacroAssembler* masm) {
const int kFormalParameters = 3;
const int kStackSize = kFormalParameters + 1;
{
FrameScope frame_scope(masm, StackFrame::INTERNAL);
const int kNewTargetOffset = kFPOnStackSize + kPCOnStackSize;
const int kArgumentsOffset = kNewTargetOffset + kPointerSize;
const int kFunctionOffset = kArgumentsOffset + kPointerSize;
const int kVectorOffset =
InternalFrameConstants::kCodeOffset - 1 * kPointerSize;
// Push the vector.
__ lw(a1, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(a1, FieldMemOperand(a1, SharedFunctionInfo::kFeedbackVectorOffset));
__ Push(a1);
// If newTarget is not supplied, set it to constructor
Label validate_arguments;
__ lw(a0, MemOperand(fp, kNewTargetOffset));
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ Branch(&validate_arguments, ne, a0, Operand(at));
__ lw(a0, MemOperand(fp, kFunctionOffset));
__ sw(a0, MemOperand(fp, kNewTargetOffset));
// Validate arguments
__ bind(&validate_arguments);
__ lw(a0, MemOperand(fp, kFunctionOffset)); // get the function
__ push(a0);
__ lw(a0, MemOperand(fp, kArgumentsOffset)); // get the args array
__ push(a0);
__ lw(a0, MemOperand(fp, kNewTargetOffset)); // get the new.target
__ push(a0);
// Returns argument count in v0.
__ InvokeBuiltin(Context::REFLECT_CONSTRUCT_PREPARE_BUILTIN_INDEX,
CALL_FUNCTION);
// Returns result in v0.
Generate_CheckStackOverflow(masm, v0, kArgcIsSmiTagged);
// Push current limit and index.
const int kIndexOffset = kVectorOffset - (2 * kPointerSize);
const int kLimitOffset = kVectorOffset - (1 * kPointerSize);
__ push(v0); // limit
__ mov(a1, zero_reg); // initial index
__ push(a1);
// Push the constructor function as callee.
__ lw(a0, MemOperand(fp, kFunctionOffset));
__ push(a0);
// Copy all arguments from the array to the stack.
Generate_PushAppliedArguments(masm, kVectorOffset, kArgumentsOffset,
kIndexOffset, kLimitOffset);
// Use undefined feedback vector
__ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
__ lw(a1, MemOperand(fp, kFunctionOffset));
__ lw(a3, MemOperand(fp, kNewTargetOffset));
// Call the function.
__ Call(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
// Leave internal frame.
}
__ jr(ra);
__ Addu(sp, sp, Operand(kStackSize * kPointerSize)); // In delay slot.
}
void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
Generate_ApplyHelper(masm, false);
}
void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
Generate_ApplyHelper(masm, true);
}
void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
Generate_ConstructHelper(masm);
}
static void ArgumentAdaptorStackCheck(MacroAssembler* masm,
Label* stack_overflow) {
// ----------- S t a t e -------------
// -- a0 : actual number of arguments
// -- a1 : function (passed through to callee)
// -- a2 : expected number of arguments
// -- a3 : new target (passed through to callee)
// -----------------------------------
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
__ LoadRoot(t1, Heap::kRealStackLimitRootIndex);
// Make t1 the space we have left. The stack might already be overflowed
// here which will cause t1 to become negative.
__ subu(t1, sp, t1);
// Check if the arguments will overflow the stack.
__ sll(at, a2, kPointerSizeLog2);
// Signed comparison.
__ Branch(stack_overflow, le, t1, Operand(at));
}
static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
__ sll(a0, a0, kSmiTagSize);
__ li(t0, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ MultiPush(a0.bit() | a1.bit() | t0.bit() | fp.bit() | ra.bit());
__ Addu(fp, sp,
Operand(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize));
}
static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- v0 : result being passed through
// -----------------------------------
// Get the number of arguments passed (as a smi), tear down the frame and
// then tear down the parameters.
__ lw(a1, MemOperand(fp, -(StandardFrameConstants::kFixedFrameSizeFromFp +
kPointerSize)));
__ mov(sp, fp);
__ MultiPop(fp.bit() | ra.bit());
__ sll(t0, a1, kPointerSizeLog2 - kSmiTagSize);
__ Addu(sp, sp, t0);
// Adjust for the receiver.
__ Addu(sp, sp, Operand(kPointerSize));
}
// static
void Builtins::Generate_CallFunction(MacroAssembler* masm,
ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a1 : the function to call (checked to be a JSFunction)
// -----------------------------------
__ AssertFunction(a1);
// See ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
// Check that the function is not a "classConstructor".
Label class_constructor;
__ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lbu(a3, FieldMemOperand(a2, SharedFunctionInfo::kFunctionKindByteOffset));
__ And(at, a3, Operand(SharedFunctionInfo::kClassConstructorBitsWithinByte));
__ Branch(&class_constructor, ne, at, Operand(zero_reg));
// 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.
STATIC_ASSERT(SharedFunctionInfo::kNativeByteOffset ==
SharedFunctionInfo::kStrictModeByteOffset);
__ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
// We need to convert the receiver for non-native sloppy mode functions.
Label done_convert;
__ lbu(a3, FieldMemOperand(a2, SharedFunctionInfo::kNativeByteOffset));
__ And(at, a3, Operand((1 << SharedFunctionInfo::kNativeBitWithinByte) |
(1 << SharedFunctionInfo::kStrictModeBitWithinByte)));
__ Branch(&done_convert, ne, at, Operand(zero_reg));
{
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a1 : the function to call (checked to be a JSFunction)
// -- a2 : the shared function info.
// -- cp : the function context.
// -----------------------------------
if (mode == ConvertReceiverMode::kNullOrUndefined) {
// Patch receiver to global proxy.
__ LoadGlobalProxy(a3);
} else {
Label convert_to_object, convert_receiver;
__ sll(at, a0, kPointerSizeLog2);
__ addu(at, sp, at);
__ lw(a3, MemOperand(at));
__ JumpIfSmi(a3, &convert_to_object);
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ GetObjectType(a3, t0, t0);
__ Branch(&done_convert, hs, t0, Operand(FIRST_JS_RECEIVER_TYPE));
if (mode != ConvertReceiverMode::kNotNullOrUndefined) {
Label convert_global_proxy;
__ JumpIfRoot(a3, Heap::kUndefinedValueRootIndex,
&convert_global_proxy);
__ JumpIfNotRoot(a3, Heap::kNullValueRootIndex, &convert_to_object);
__ bind(&convert_global_proxy);
{
// Patch receiver to global proxy.
__ LoadGlobalProxy(a3);
}
__ Branch(&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);
__ sll(a0, a0, kSmiTagSize); // Smi tagged.
__ Push(a0, a1);
__ mov(a0, a3);
ToObjectStub stub(masm->isolate());
__ CallStub(&stub);
__ mov(a3, v0);
__ Pop(a0, a1);
__ sra(a0, a0, kSmiTagSize); // Un-tag.
}
__ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ bind(&convert_receiver);
}
__ sll(at, a0, kPointerSizeLog2);
__ addu(at, sp, at);
__ sw(a3, MemOperand(at));
}
__ bind(&done_convert);
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a1 : the function to call (checked to be a JSFunction)
// -- a2 : the shared function info.
// -- cp : the function context.
// -----------------------------------
__ lw(a2,
FieldMemOperand(a2, SharedFunctionInfo::kFormalParameterCountOffset));
__ sra(a2, a2, kSmiTagSize); // Un-tag.
ParameterCount actual(a0);
ParameterCount expected(a2);
__ InvokeFunctionCode(a1, no_reg, expected, actual, JUMP_FUNCTION,
CheckDebugStepCallWrapper());
// The function is a "classConstructor", need to raise an exception.
__ bind(&class_constructor);
{
FrameScope frame(masm, StackFrame::INTERNAL);
__ Push(a1);
__ CallRuntime(Runtime::kThrowConstructorNonCallableError, 1);
}
}
// static
void Builtins::Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode) {
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a1 : the target to call (can be any Object).
// -----------------------------------
Label non_callable, non_function, non_smi;
__ JumpIfSmi(a1, &non_callable);
__ bind(&non_smi);
__ GetObjectType(a1, t1, t2);
__ Jump(masm->isolate()->builtins()->CallFunction(mode),
RelocInfo::CODE_TARGET, eq, t2, Operand(JS_FUNCTION_TYPE));
__ Branch(&non_function, ne, t2, Operand(JS_PROXY_TYPE));
// 1. Runtime fallback for Proxy [[Call]].
__ Push(a1);
// Increase the arguments size to include the pushed function and the
// existing receiver on the stack.
__ Addu(a0, a0, 2);
// Tail-call to the runtime.
__ JumpToExternalReference(
ExternalReference(Runtime::kJSProxyCall, masm->isolate()));
// 2. Call to something else, which might have a [[Call]] internal method (if
// not we raise an exception).
__ bind(&non_function);
// Check if target has a [[Call]] internal method.
__ lbu(t1, FieldMemOperand(t1, Map::kBitFieldOffset));
__ And(t1, t1, Operand(1 << Map::kIsCallable));
__ Branch(&non_callable, eq, t1, Operand(zero_reg));
// Overwrite the original receiver with the (original) target.
__ sll(at, a0, kPointerSizeLog2);
__ addu(at, sp, at);
__ sw(a1, MemOperand(at));
// Let the "call_as_function_delegate" take care of the rest.
__ LoadNativeContextSlot(Context::CALL_AS_FUNCTION_DELEGATE_INDEX, a1);
__ 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(a1);
__ CallRuntime(Runtime::kThrowCalledNonCallable, 1);
}
}
// static
void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a1 : the constructor to call (checked to be a JSFunction)
// -- a3 : the new target (checked to be a constructor)
// -----------------------------------
__ AssertFunction(a1);
// Calling convention for function specific ConstructStubs require
// a2 to contain either an AllocationSite or undefined.
__ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
// Tail call to the function-specific construct stub (still in the caller
// context at this point).
__ lw(t0, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(t0, FieldMemOperand(t0, SharedFunctionInfo::kConstructStubOffset));
__ Addu(at, t0, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(at);
}
// static
void Builtins::Generate_ConstructProxy(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a1 : the constructor to call (checked to be a JSProxy)
// -- a3 : the new target (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -----------------------------------
// Call into the Runtime for Proxy [[Construct]].
__ Push(a1);
__ Push(a3);
// Include the pushed new_target, constructor and the receiver.
__ Addu(a0, a0, Operand(3));
// Tail-call to the runtime.
__ JumpToExternalReference(
ExternalReference(Runtime::kJSProxyConstruct, masm->isolate()));
}
// static
void Builtins::Generate_Construct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- a0 : the number of arguments (not including the receiver)
// -- a1 : the constructor to call (can be any Object)
// -- a3 : the new target (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -----------------------------------
// Check if target is a Smi.
Label non_constructor;
__ JumpIfSmi(a1, &non_constructor);
// Dispatch based on instance type.
__ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
__ lbu(t2, FieldMemOperand(t1, Map::kInstanceTypeOffset));
__ Jump(masm->isolate()->builtins()->ConstructFunction(),
RelocInfo::CODE_TARGET, eq, t2, Operand(JS_FUNCTION_TYPE));
// Check if target has a [[Construct]] internal method.
__ lbu(t2, FieldMemOperand(t1, Map::kBitFieldOffset));
__ And(t2, t2, Operand(1 << Map::kIsCallable));
__ Branch(&non_constructor, eq, t2, Operand(zero_reg));
// Only dispatch to proxies after checking whether they are constructors.
__ Jump(masm->isolate()->builtins()->ConstructProxy(), RelocInfo::CODE_TARGET,
eq, t2, Operand(JS_PROXY_TYPE));
// Called Construct on an exotic Object with a [[Construct]] internal method.
{
// Overwrite the original receiver with the (original) target.
__ sll(at, a0, kPointerSizeLog2);
__ addu(at, sp, at);
__ sw(a1, MemOperand(at));
// Let the "call_as_constructor_delegate" take care of the rest.
__ LoadNativeContextSlot(Context::CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, a1);
__ 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(masm->isolate()->builtins()->ConstructedNonConstructable(),
RelocInfo::CODE_TARGET);
}
void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
// State setup as expected by MacroAssembler::InvokePrologue.
// ----------- S t a t e -------------
// -- a0: actual arguments count
// -- a1: function (passed through to callee)
// -- a2: expected arguments count
// -- a3: new target (passed through to callee)
// -----------------------------------
Label invoke, dont_adapt_arguments, stack_overflow;
Label enough, too_few;
__ Branch(&dont_adapt_arguments, eq,
a2, Operand(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
// We use Uless as the number of argument should always be greater than 0.
__ Branch(&too_few, Uless, a0, Operand(a2));
{ // Enough parameters: actual >= expected.
// a0: actual number of arguments as a smi
// a1: function
// a2: expected number of arguments
// a3: new target (passed through to callee)
__ bind(&enough);
EnterArgumentsAdaptorFrame(masm);
ArgumentAdaptorStackCheck(masm, &stack_overflow);
// Calculate copy start address into a0 and copy end address into t1.
__ sll(a0, a0, kPointerSizeLog2 - kSmiTagSize);
__ Addu(a0, fp, a0);
// Adjust for return address and receiver.
__ Addu(a0, a0, Operand(2 * kPointerSize));
// Compute copy end address.
__ sll(t1, a2, kPointerSizeLog2);
__ subu(t1, a0, t1);
// Copy the arguments (including the receiver) to the new stack frame.
// a0: copy start address
// a1: function
// a2: expected number of arguments
// a3: new target (passed through to callee)
// t1: copy end address
Label copy;
__ bind(&copy);
__ lw(t0, MemOperand(a0));
__ push(t0);
__ Branch(USE_DELAY_SLOT, &copy, ne, a0, Operand(t1));
__ addiu(a0, a0, -kPointerSize); // In delay slot.
__ jmp(&invoke);
}
{ // Too few parameters: Actual < expected.
__ bind(&too_few);
// If the function is strong we need to throw an error.
Label no_strong_error;
__ lw(t1, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
__ lw(t2, FieldMemOperand(t1, SharedFunctionInfo::kCompilerHintsOffset));
__ And(t3, t2, Operand(1 << (SharedFunctionInfo::kStrongModeFunction +
kSmiTagSize)));
__ Branch(&no_strong_error, eq, t3, Operand(zero_reg));
// What we really care about is the required number of arguments.
__ lw(t2, FieldMemOperand(t1, SharedFunctionInfo::kLengthOffset));
__ SmiUntag(t2);
__ Branch(&no_strong_error, ge, a0, Operand(t2));
{
FrameScope frame(masm, StackFrame::MANUAL);
EnterArgumentsAdaptorFrame(masm);
__ CallRuntime(Runtime::kThrowStrongModeTooFewArguments, 0);
}
__ bind(&no_strong_error);
EnterArgumentsAdaptorFrame(masm);
ArgumentAdaptorStackCheck(masm, &stack_overflow);
// Calculate copy start address into a0 and copy end address into t3.
// a0: actual number of arguments as a smi
// a1: function
// a2: expected number of arguments
// a3: new target (passed through to callee)
__ sll(a0, a0, kPointerSizeLog2 - kSmiTagSize);
__ Addu(a0, fp, a0);
// Adjust for return address and receiver.
__ Addu(a0, a0, Operand(2 * kPointerSize));
// Compute copy end address. Also adjust for return address.
__ Addu(t3, fp, kPointerSize);
// Copy the arguments (including the receiver) to the new stack frame.
// a0: copy start address
// a1: function
// a2: expected number of arguments
// a3: new target (passed through to callee)
// t3: copy end address
Label copy;
__ bind(&copy);
__ lw(t0, MemOperand(a0)); // Adjusted above for return addr and receiver.
__ Subu(sp, sp, kPointerSize);
__ Subu(a0, a0, kPointerSize);
__ Branch(USE_DELAY_SLOT, &copy, ne, a0, Operand(t3));
__ sw(t0, MemOperand(sp)); // In the delay slot.
// Fill the remaining expected arguments with undefined.
// a1: function
// a2: expected number of arguments
// a3: new target (passed through to callee)
__ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
__ sll(t2, a2, kPointerSizeLog2);
__ Subu(t1, fp, Operand(t2));
// Adjust for frame.
__ Subu(t1, t1, Operand(StandardFrameConstants::kFixedFrameSizeFromFp +
2 * kPointerSize));
Label fill;
__ bind(&fill);
__ Subu(sp, sp, kPointerSize);
__ Branch(USE_DELAY_SLOT, &fill, ne, sp, Operand(t1));
__ sw(t0, MemOperand(sp));
}
// Call the entry point.
__ bind(&invoke);
__ mov(a0, a2);
// a0 : expected number of arguments
// a1 : function (passed through to callee)
// a3 : new target (passed through to callee)
__ lw(t0, FieldMemOperand(a1, JSFunction::kCodeEntryOffset));
__ Call(t0);
// Store offset of return address for deoptimizer.
masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(masm->pc_offset());
// Exit frame and return.
LeaveArgumentsAdaptorFrame(masm);
__ Ret();
// -------------------------------------------
// Don't adapt arguments.
// -------------------------------------------
__ bind(&dont_adapt_arguments);
__ lw(t0, FieldMemOperand(a1, JSFunction::kCodeEntryOffset));
__ Jump(t0);
__ bind(&stack_overflow);
{
FrameScope frame(masm, StackFrame::MANUAL);
__ CallRuntime(Runtime::kThrowStackOverflow, 0);
__ break_(0xCC);
}
}
#undef __
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_MIPS