Push version 1.2.8 to trunk.
Optimized math on ARM platforms.
Fixed two crash bugs in the handling of getters and setters.
Improved the debugger support by adding scope chain information.
Improved the profiler support by compressing log data transmitted to clients.
Improved overall performance.
git-svn-id: http://v8.googlecode.com/svn/trunk@2181 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 54c299d..c47bfcc 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -29,7 +29,9 @@
#include "bootstrapper.h"
#include "codegen-inl.h"
+#include "assembler-x64.h"
#include "macro-assembler-x64.h"
+#include "debug.h"
namespace v8 {
namespace internal {
@@ -43,8 +45,152 @@
}
-void MacroAssembler::TailCallRuntime(ExternalReference const& a, int b) {
- UNIMPLEMENTED();
+void MacroAssembler::Assert(Condition cc, const char* msg) {
+ if (FLAG_debug_code) Check(cc, msg);
+}
+
+
+void MacroAssembler::Check(Condition cc, const char* msg) {
+ Label L;
+ j(cc, &L);
+ Abort(msg);
+ // will not return here
+ bind(&L);
+}
+
+
+void MacroAssembler::ConstructAndTestJSFunction() {
+ const int initial_buffer_size = 4 * KB;
+ char* buffer = new char[initial_buffer_size];
+ MacroAssembler masm(buffer, initial_buffer_size);
+
+ const uint64_t secret = V8_INT64_C(0xdeadbeefcafebabe);
+ Handle<String> constant =
+ Factory::NewStringFromAscii(Vector<const char>("451", 3), TENURED);
+#define __ ACCESS_MASM((&masm))
+ // Construct a simple JSfunction here, using Assembler and MacroAssembler
+ // commands.
+ __ movq(rax, constant, RelocInfo::EMBEDDED_OBJECT);
+ __ push(rax);
+ __ CallRuntime(Runtime::kStringParseFloat, 1);
+ __ movq(kScratchRegister, secret, RelocInfo::NONE);
+ __ addq(rax, kScratchRegister);
+ __ ret(0);
+#undef __
+ CodeDesc desc;
+ masm.GetCode(&desc);
+ Code::Flags flags = Code::ComputeFlags(Code::FUNCTION);
+ Object* code = Heap::CreateCode(desc, NULL, flags, Handle<Object>::null());
+ if (!code->IsFailure()) {
+ Handle<Code> code_handle(Code::cast(code));
+ Handle<String> name =
+ Factory::NewStringFromAscii(Vector<const char>("foo", 3), NOT_TENURED);
+ Handle<JSFunction> function =
+ Factory::NewFunction(name,
+ JS_FUNCTION_TYPE,
+ JSObject::kHeaderSize,
+ code_handle,
+ true);
+ bool pending_exceptions;
+ Handle<Object> result =
+ Execution::Call(function,
+ Handle<Object>::cast(function),
+ 0,
+ NULL,
+ &pending_exceptions);
+ CHECK(result->IsSmi());
+ CHECK(secret + (451 << kSmiTagSize) == reinterpret_cast<uint64_t>(*result));
+ }
+}
+
+
+void MacroAssembler::Abort(const char* msg) {
+ // We want to pass the msg string like a smi to avoid GC
+ // problems, however msg is not guaranteed to be aligned
+ // properly. Instead, we pass an aligned pointer that is
+ // a proper v8 smi, but also pass the alignment difference
+ // from the real pointer as a smi.
+ intptr_t p1 = reinterpret_cast<intptr_t>(msg);
+ intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag;
+ // Note: p0 might not be a valid Smi *value*, but it has a valid Smi tag.
+ ASSERT(reinterpret_cast<Object*>(p0)->IsSmi());
+#ifdef DEBUG
+ if (msg != NULL) {
+ RecordComment("Abort message: ");
+ RecordComment(msg);
+ }
+#endif
+ push(rax);
+ movq(kScratchRegister, p0, RelocInfo::NONE);
+ push(kScratchRegister);
+ movq(kScratchRegister,
+ reinterpret_cast<intptr_t>(Smi::FromInt(p1 - p0)),
+ RelocInfo::NONE);
+ push(kScratchRegister);
+ CallRuntime(Runtime::kAbort, 2);
+ // will not return here
+}
+
+
+void MacroAssembler::CallStub(CodeStub* stub) {
+ ASSERT(allow_stub_calls()); // calls are not allowed in some stubs
+ movq(kScratchRegister, stub->GetCode(), RelocInfo::CODE_TARGET);
+ call(kScratchRegister);
+}
+
+
+void MacroAssembler::StubReturn(int argc) {
+ ASSERT(argc >= 1 && generating_stub());
+ ret((argc - 1) * kPointerSize);
+}
+
+
+void MacroAssembler::IllegalOperation(int num_arguments) {
+ if (num_arguments > 0) {
+ addq(rsp, Immediate(num_arguments * kPointerSize));
+ }
+ movq(rax, Factory::undefined_value(), RelocInfo::EMBEDDED_OBJECT);
+}
+
+
+void MacroAssembler::CallRuntime(Runtime::FunctionId id, int num_arguments) {
+ CallRuntime(Runtime::FunctionForId(id), num_arguments);
+}
+
+
+void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
+ // If the expected number of arguments of the runtime function is
+ // constant, we check that the actual number of arguments match the
+ // expectation.
+ if (f->nargs >= 0 && f->nargs != num_arguments) {
+ IllegalOperation(num_arguments);
+ return;
+ }
+
+ Runtime::FunctionId function_id =
+ static_cast<Runtime::FunctionId>(f->stub_id);
+ RuntimeStub stub(function_id, num_arguments);
+ CallStub(&stub);
+}
+
+
+void MacroAssembler::TailCallRuntime(ExternalReference const& ext,
+ int num_arguments) {
+ // TODO(1236192): Most runtime routines don't need the number of
+ // arguments passed in because it is constant. At some point we
+ // should remove this need and make the runtime routine entry code
+ // smarter.
+ movq(rax, Immediate(num_arguments));
+ JumpToBuiltin(ext);
+}
+
+
+void MacroAssembler::JumpToBuiltin(const ExternalReference& ext) {
+ // Set the entry point and jump to the C entry runtime stub.
+ movq(rbx, ext);
+ CEntryStub ces;
+ movq(kScratchRegister, ces.GetCode(), RelocInfo::CODE_TARGET);
+ jmp(kScratchRegister);
}
@@ -71,18 +217,43 @@
}
+void MacroAssembler::Jump(ExternalReference ext) {
+ movq(kScratchRegister, ext);
+ jmp(kScratchRegister);
+}
+
+
+void MacroAssembler::Jump(Address destination, RelocInfo::Mode rmode) {
+ movq(kScratchRegister, destination, rmode);
+ jmp(kScratchRegister);
+}
+
+
+void MacroAssembler::Call(ExternalReference ext) {
+ movq(kScratchRegister, ext);
+ call(kScratchRegister);
+}
+
+
+void MacroAssembler::Call(Address destination, RelocInfo::Mode rmode) {
+ movq(kScratchRegister, destination, rmode);
+ call(kScratchRegister);
+}
+
+
void MacroAssembler::PushTryHandler(CodeLocation try_location,
HandlerType type) {
- // The pc (return address) is already on TOS.
- // This code pushes state, code, frame pointer and parameter pointer.
- // Check that they are expected next on the stack, int that order.
+ // Adjust this code if not the case.
+ ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
+
+ // The pc (return address) is already on TOS. This code pushes state,
+ // frame pointer and current handler. Check that they are expected
+ // next on the stack, in that order.
ASSERT_EQ(StackHandlerConstants::kStateOffset,
StackHandlerConstants::kPCOffset - kPointerSize);
- ASSERT_EQ(StackHandlerConstants::kCodeOffset,
- StackHandlerConstants::kStateOffset - kPointerSize);
ASSERT_EQ(StackHandlerConstants::kFPOffset,
- StackHandlerConstants::kCodeOffset - kPointerSize);
- ASSERT_EQ(StackHandlerConstants::kPPOffset,
+ StackHandlerConstants::kStateOffset - kPointerSize);
+ ASSERT_EQ(StackHandlerConstants::kNextOffset,
StackHandlerConstants::kFPOffset - kPointerSize);
if (try_location == IN_JAVASCRIPT) {
@@ -91,26 +262,414 @@
} else {
push(Immediate(StackHandler::TRY_FINALLY));
}
- push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent)));
push(rbp);
- push(rdi);
} else {
ASSERT(try_location == IN_JS_ENTRY);
- // The parameter pointer is meaningless here and ebp does not
- // point to a JS frame. So we save NULL for both pp and ebp. We
- // expect the code throwing an exception to check ebp before
- // dereferencing it to restore the context.
+ // The frame pointer does not point to a JS frame so we save NULL
+ // for rbp. We expect the code throwing an exception to check rbp
+ // before dereferencing it to restore the context.
push(Immediate(StackHandler::ENTRY));
- push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent)));
- push(Immediate(0)); // NULL frame pointer
- push(Immediate(0)); // NULL parameter pointer
+ push(Immediate(0)); // NULL frame pointer.
}
+ // Save the current handler.
movq(kScratchRegister, ExternalReference(Top::k_handler_address));
- // Cached TOS.
- movq(rax, Operand(kScratchRegister, 0));
+ push(Operand(kScratchRegister, 0));
// Link this handler.
movq(Operand(kScratchRegister, 0), rsp);
}
+void MacroAssembler::Ret() {
+ ret(0);
+}
+
+
+void MacroAssembler::CmpObjectType(Register heap_object,
+ InstanceType type,
+ Register map) {
+ movq(map, FieldOperand(heap_object, HeapObject::kMapOffset));
+ CmpInstanceType(map, type);
+}
+
+
+void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
+ cmpb(FieldOperand(map, Map::kInstanceTypeOffset),
+ Immediate(static_cast<int8_t>(type)));
+}
+
+
+
+void MacroAssembler::SetCounter(StatsCounter* counter, int value) {
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ movq(kScratchRegister, ExternalReference(counter));
+ movl(Operand(kScratchRegister, 0), Immediate(value));
+ }
+}
+
+
+void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) {
+ ASSERT(value > 0);
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ movq(kScratchRegister, ExternalReference(counter));
+ Operand operand(kScratchRegister, 0);
+ if (value == 1) {
+ incl(operand);
+ } else {
+ addl(operand, Immediate(value));
+ }
+ }
+}
+
+
+void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) {
+ ASSERT(value > 0);
+ if (FLAG_native_code_counters && counter->Enabled()) {
+ movq(kScratchRegister, ExternalReference(counter));
+ Operand operand(kScratchRegister, 0);
+ if (value == 1) {
+ decl(operand);
+ } else {
+ subl(operand, Immediate(value));
+ }
+ }
+}
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+
+void MacroAssembler::PushRegistersFromMemory(RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Push the content of the memory location to the stack.
+ for (int i = 0; i < kNumJSCallerSaved; i++) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ ExternalReference reg_addr =
+ ExternalReference(Debug_Address::Register(i));
+ movq(kScratchRegister, reg_addr);
+ push(Operand(kScratchRegister, 0));
+ }
+ }
+}
+
+void MacroAssembler::SaveRegistersToMemory(RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Copy the content of registers to memory location.
+ for (int i = 0; i < kNumJSCallerSaved; i++) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ Register reg = { r };
+ ExternalReference reg_addr =
+ ExternalReference(Debug_Address::Register(i));
+ movq(kScratchRegister, reg_addr);
+ movq(Operand(kScratchRegister, 0), reg);
+ }
+ }
+}
+
+
+void MacroAssembler::RestoreRegistersFromMemory(RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Copy the content of memory location to registers.
+ for (int i = kNumJSCallerSaved - 1; i >= 0; i--) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ Register reg = { r };
+ ExternalReference reg_addr =
+ ExternalReference(Debug_Address::Register(i));
+ movq(kScratchRegister, reg_addr);
+ movq(reg, Operand(kScratchRegister, 0));
+ }
+ }
+}
+
+
+void MacroAssembler::PopRegistersToMemory(RegList regs) {
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Pop the content from the stack to the memory location.
+ for (int i = kNumJSCallerSaved - 1; i >= 0; i--) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ ExternalReference reg_addr =
+ ExternalReference(Debug_Address::Register(i));
+ movq(kScratchRegister, reg_addr);
+ pop(Operand(kScratchRegister, 0));
+ }
+ }
+}
+
+
+void MacroAssembler::CopyRegistersFromStackToMemory(Register base,
+ Register scratch,
+ RegList regs) {
+ ASSERT(!scratch.is(kScratchRegister));
+ ASSERT(!base.is(kScratchRegister));
+ ASSERT(!base.is(scratch));
+ ASSERT((regs & ~kJSCallerSaved) == 0);
+ // Copy the content of the stack to the memory location and adjust base.
+ for (int i = kNumJSCallerSaved - 1; i >= 0; i--) {
+ int r = JSCallerSavedCode(i);
+ if ((regs & (1 << r)) != 0) {
+ movq(scratch, Operand(base, 0));
+ ExternalReference reg_addr =
+ ExternalReference(Debug_Address::Register(i));
+ movq(kScratchRegister, reg_addr);
+ movq(Operand(kScratchRegister, 0), scratch);
+ lea(base, Operand(base, kPointerSize));
+ }
+ }
+}
+
+#endif // ENABLE_DEBUGGER_SUPPORT
+
+
+void MacroAssembler::InvokePrologue(const ParameterCount& expected,
+ const ParameterCount& actual,
+ Handle<Code> code_constant,
+ Register code_register,
+ Label* done,
+ InvokeFlag flag) {
+ bool definitely_matches = false;
+ Label invoke;
+ if (expected.is_immediate()) {
+ ASSERT(actual.is_immediate());
+ if (expected.immediate() == actual.immediate()) {
+ definitely_matches = true;
+ } else {
+ movq(rax, Immediate(actual.immediate()));
+ if (expected.immediate() ==
+ SharedFunctionInfo::kDontAdaptArgumentsSentinel) {
+ // Don't worry about adapting arguments for built-ins that
+ // don't want that done. Skip adaption code by making it look
+ // like we have a match between expected and actual number of
+ // arguments.
+ definitely_matches = true;
+ } else {
+ movq(rbx, Immediate(expected.immediate()));
+ }
+ }
+ } else {
+ if (actual.is_immediate()) {
+ // Expected is in register, actual is immediate. This is the
+ // case when we invoke function values without going through the
+ // IC mechanism.
+ cmpq(expected.reg(), Immediate(actual.immediate()));
+ j(equal, &invoke);
+ ASSERT(expected.reg().is(rbx));
+ movq(rax, Immediate(actual.immediate()));
+ } else if (!expected.reg().is(actual.reg())) {
+ // Both expected and actual are in (different) registers. This
+ // is the case when we invoke functions using call and apply.
+ cmpq(expected.reg(), actual.reg());
+ j(equal, &invoke);
+ ASSERT(actual.reg().is(rax));
+ ASSERT(expected.reg().is(rbx));
+ }
+ }
+
+ if (!definitely_matches) {
+ Handle<Code> adaptor =
+ Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline));
+ if (!code_constant.is_null()) {
+ movq(rdx, code_constant, RelocInfo::EMBEDDED_OBJECT);
+ addq(rdx, Immediate(Code::kHeaderSize - kHeapObjectTag));
+ } else if (!code_register.is(rdx)) {
+ movq(rdx, code_register);
+ }
+
+ movq(kScratchRegister, adaptor, RelocInfo::CODE_TARGET);
+ if (flag == CALL_FUNCTION) {
+ call(kScratchRegister);
+ jmp(done);
+ } else {
+ jmp(kScratchRegister);
+ }
+ bind(&invoke);
+ }
+}
+
+
+
+
+void MacroAssembler::InvokeCode(Register code,
+ const ParameterCount& expected,
+ const ParameterCount& actual,
+ InvokeFlag flag) {
+ Label done;
+ InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag);
+ if (flag == CALL_FUNCTION) {
+ call(code);
+ } else {
+ ASSERT(flag == JUMP_FUNCTION);
+ jmp(code);
+ }
+ bind(&done);
+}
+
+
+void MacroAssembler::InvokeCode(Handle<Code> code,
+ const ParameterCount& expected,
+ const ParameterCount& actual,
+ RelocInfo::Mode rmode,
+ InvokeFlag flag) {
+ Label done;
+ Register dummy = rax;
+ InvokePrologue(expected, actual, code, dummy, &done, flag);
+ movq(kScratchRegister, code, rmode);
+ if (flag == CALL_FUNCTION) {
+ call(kScratchRegister);
+ } else {
+ ASSERT(flag == JUMP_FUNCTION);
+ jmp(kScratchRegister);
+ }
+ bind(&done);
+}
+
+
+void MacroAssembler::InvokeFunction(Register function,
+ const ParameterCount& actual,
+ InvokeFlag flag) {
+ ASSERT(function.is(rdi));
+ movq(rdx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
+ movq(rsi, FieldOperand(function, JSFunction::kContextOffset));
+ movl(rbx, FieldOperand(rdx, SharedFunctionInfo::kFormalParameterCountOffset));
+ movq(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset));
+ // Advances rdx to the end of the Code object headers, to the start of
+ // the executable code.
+ lea(rdx, FieldOperand(rdx, Code::kHeaderSize));
+
+ ParameterCount expected(rbx);
+ InvokeCode(rdx, expected, actual, flag);
+}
+
+
+void MacroAssembler::EnterFrame(StackFrame::Type type) {
+ push(rbp);
+ movq(rbp, rsp);
+ push(rsi); // Context.
+ push(Immediate(Smi::FromInt(type)));
+ movq(kScratchRegister, CodeObject(), RelocInfo::EMBEDDED_OBJECT);
+ push(kScratchRegister);
+ if (FLAG_debug_code) {
+ movq(kScratchRegister,
+ Factory::undefined_value(),
+ RelocInfo::EMBEDDED_OBJECT);
+ cmpq(Operand(rsp, 0), kScratchRegister);
+ Check(not_equal, "code object not properly patched");
+ }
+}
+
+
+void MacroAssembler::LeaveFrame(StackFrame::Type type) {
+ if (FLAG_debug_code) {
+ movq(kScratchRegister, Immediate(Smi::FromInt(type)));
+ cmpq(Operand(rbp, StandardFrameConstants::kMarkerOffset), kScratchRegister);
+ Check(equal, "stack frame types must match");
+ }
+ movq(rsp, rbp);
+ pop(rbp);
+}
+
+
+
+void MacroAssembler::EnterExitFrame(StackFrame::Type type) {
+ ASSERT(type == StackFrame::EXIT || type == StackFrame::EXIT_DEBUG);
+
+ // Setup the frame structure on the stack.
+ ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize);
+ ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize);
+ ASSERT(ExitFrameConstants::kCallerFPOffset == 0 * kPointerSize);
+ push(rbp);
+ movq(rbp, rsp);
+
+ // Reserve room for entry stack pointer and push the debug marker.
+ ASSERT(ExitFrameConstants::kSPOffset == -1 * kPointerSize);
+ push(Immediate(0)); // saved entry sp, patched before call
+ push(Immediate(type == StackFrame::EXIT_DEBUG ? 1 : 0));
+
+ // Save the frame pointer and the context in top.
+ ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
+ ExternalReference context_address(Top::k_context_address);
+ movq(rdi, rax); // Backup rax before we use it.
+
+ movq(rax, rbp);
+ store_rax(c_entry_fp_address);
+ movq(rax, rsi);
+ store_rax(context_address);
+
+ // Setup argv in callee-saved register r15. It is reused in LeaveExitFrame,
+ // so it must be retained across the C-call.
+ int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
+ lea(r15, Operand(rbp, rdi, kTimesPointerSize, offset));
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ // Save the state of all registers to the stack from the memory
+ // location. This is needed to allow nested break points.
+ if (type == StackFrame::EXIT_DEBUG) {
+ // TODO(1243899): This should be symmetric to
+ // CopyRegistersFromStackToMemory() but it isn't! esp is assumed
+ // correct here, but computed for the other call. Very error
+ // prone! FIX THIS. Actually there are deeper problems with
+ // register saving than this asymmetry (see the bug report
+ // associated with this issue).
+ PushRegistersFromMemory(kJSCallerSaved);
+ }
+#endif
+
+ // Reserve space for two arguments: argc and argv
+ subq(rsp, Immediate(2 * kPointerSize));
+
+ // Get the required frame alignment for the OS.
+ static const int kFrameAlignment = OS::ActivationFrameAlignment();
+ if (kFrameAlignment > 0) {
+ ASSERT(IsPowerOf2(kFrameAlignment));
+ movq(kScratchRegister, Immediate(-kFrameAlignment));
+ and_(rsp, kScratchRegister);
+ }
+
+ // Patch the saved entry sp.
+ movq(Operand(rbp, ExitFrameConstants::kSPOffset), rsp);
+}
+
+
+void MacroAssembler::LeaveExitFrame(StackFrame::Type type) {
+ // Registers:
+ // r15 : argv
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ // Restore the memory copy of the registers by digging them out from
+ // the stack. This is needed to allow nested break points.
+ if (type == StackFrame::EXIT_DEBUG) {
+ // It's okay to clobber register ebx below because we don't need
+ // the function pointer after this.
+ const int kCallerSavedSize = kNumJSCallerSaved * kPointerSize;
+ int kOffset = ExitFrameConstants::kDebugMarkOffset - kCallerSavedSize;
+ lea(rbx, Operand(rbp, kOffset));
+ CopyRegistersFromStackToMemory(rbx, rcx, kJSCallerSaved);
+ }
+#endif
+
+ // Get the return address from the stack and restore the frame pointer.
+ movq(rcx, Operand(rbp, 1 * kPointerSize));
+ movq(rbp, Operand(rbp, 0 * kPointerSize));
+
+ // Pop the arguments and the receiver from the caller stack.
+ lea(rsp, Operand(r15, 1 * kPointerSize));
+
+ // Restore current context from top and clear it in debug mode.
+ ExternalReference context_address(Top::k_context_address);
+ movq(kScratchRegister, context_address);
+ movq(rsi, Operand(kScratchRegister, 0));
+#ifdef DEBUG
+ movq(Operand(kScratchRegister, 0), Immediate(0));
+#endif
+
+ // Push the return address to get ready to return.
+ push(rcx);
+
+ // Clear the top frame.
+ ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
+ movq(kScratchRegister, c_entry_fp_address);
+ movq(Operand(kScratchRegister, 0), Immediate(0));
+}
+
+
} } // namespace v8::internal