// Copyright 2011 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 defined(V8_TARGET_ARCH_IA32)
#include "bootstrapper.h"
#include "codegen-inl.h"
#include "debug.h"
#include "runtime.h"
#include "serialize.h"
namespace v8 {
namespace internal {
// -------------------------------------------------------------------------
// MacroAssembler implementation.
MacroAssembler::MacroAssembler(Isolate* arg_isolate, void* buffer, int size)
: Assembler(arg_isolate, buffer, size),
generating_stub_(false),
allow_stub_calls_(true) {
if (isolate() != NULL) {
code_object_ = Handle<Object>(isolate()->heap()->undefined_value(),
isolate());
}
}
void MacroAssembler::RecordWriteHelper(Register object,
Register addr,
Register scratch) {
if (emit_debug_code()) {
// Check that the object is not in new space.
Label not_in_new_space;
InNewSpace(object, scratch, not_equal, ¬_in_new_space);
Abort("new-space object passed to RecordWriteHelper");
bind(¬_in_new_space);
}
// Compute the page start address from the heap object pointer, and reuse
// the 'object' register for it.
and_(object, ~Page::kPageAlignmentMask);
// Compute number of region covering addr. See Page::GetRegionNumberForAddress
// method for more details.
and_(addr, Page::kPageAlignmentMask);
shr(addr, Page::kRegionSizeLog2);
// Set dirty mark for region.
bts(Operand(object, Page::kDirtyFlagOffset), addr);
}
void MacroAssembler::RecordWrite(Register object,
int offset,
Register value,
Register scratch) {
// First, check if a write barrier is even needed. The tests below
// catch stores of Smis and stores into young gen.
NearLabel done;
// Skip barrier if writing a smi.
ASSERT_EQ(0, kSmiTag);
test(value, Immediate(kSmiTagMask));
j(zero, &done);
InNewSpace(object, value, equal, &done);
// The offset is relative to a tagged or untagged HeapObject pointer,
// so either offset or offset + kHeapObjectTag must be a
// multiple of kPointerSize.
ASSERT(IsAligned(offset, kPointerSize) ||
IsAligned(offset + kHeapObjectTag, kPointerSize));
Register dst = scratch;
if (offset != 0) {
lea(dst, Operand(object, offset));
} else {
// Array access: calculate the destination address in the same manner as
// KeyedStoreIC::GenerateGeneric. Multiply a smi by 2 to get an offset
// into an array of words.
ASSERT_EQ(1, kSmiTagSize);
ASSERT_EQ(0, kSmiTag);
lea(dst, Operand(object, dst, times_half_pointer_size,
FixedArray::kHeaderSize - kHeapObjectTag));
}
RecordWriteHelper(object, dst, value);
bind(&done);
// Clobber all input registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
mov(object, Immediate(BitCast<int32_t>(kZapValue)));
mov(value, Immediate(BitCast<int32_t>(kZapValue)));
mov(scratch, Immediate(BitCast<int32_t>(kZapValue)));
}
}
void MacroAssembler::RecordWrite(Register object,
Register address,
Register value) {
// First, check if a write barrier is even needed. The tests below
// catch stores of Smis and stores into young gen.
Label done;
// Skip barrier if writing a smi.
ASSERT_EQ(0, kSmiTag);
test(value, Immediate(kSmiTagMask));
j(zero, &done);
InNewSpace(object, value, equal, &done);
RecordWriteHelper(object, address, value);
bind(&done);
// Clobber all input registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
mov(object, Immediate(BitCast<int32_t>(kZapValue)));
mov(address, Immediate(BitCast<int32_t>(kZapValue)));
mov(value, Immediate(BitCast<int32_t>(kZapValue)));
}
}
#ifdef ENABLE_DEBUGGER_SUPPORT
void MacroAssembler::DebugBreak() {
Set(eax, Immediate(0));
mov(ebx, Immediate(ExternalReference(Runtime::kDebugBreak, isolate())));
CEntryStub ces(1);
call(ces.GetCode(), RelocInfo::DEBUG_BREAK);
}
#endif
void MacroAssembler::Set(Register dst, const Immediate& x) {
if (x.is_zero()) {
xor_(dst, Operand(dst)); // shorter than mov
} else {
mov(dst, x);
}
}
void MacroAssembler::Set(const Operand& dst, const Immediate& x) {
mov(dst, x);
}
void MacroAssembler::CmpObjectType(Register heap_object,
InstanceType type,
Register map) {
mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
CmpInstanceType(map, type);
}
void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
cmpb(FieldOperand(map, Map::kInstanceTypeOffset),
static_cast<int8_t>(type));
}
void MacroAssembler::CheckMap(Register obj,
Handle<Map> map,
Label* fail,
bool is_heap_object) {
if (!is_heap_object) {
test(obj, Immediate(kSmiTagMask));
j(zero, fail);
}
cmp(FieldOperand(obj, HeapObject::kMapOffset), Immediate(map));
j(not_equal, fail);
}
Condition MacroAssembler::IsObjectStringType(Register heap_object,
Register map,
Register instance_type) {
mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
movzx_b(instance_type, FieldOperand(map, Map::kInstanceTypeOffset));
ASSERT(kNotStringTag != 0);
test(instance_type, Immediate(kIsNotStringMask));
return zero;
}
void MacroAssembler::IsObjectJSObjectType(Register heap_object,
Register map,
Register scratch,
Label* fail) {
mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
IsInstanceJSObjectType(map, scratch, fail);
}
void MacroAssembler::IsInstanceJSObjectType(Register map,
Register scratch,
Label* fail) {
movzx_b(scratch, FieldOperand(map, Map::kInstanceTypeOffset));
sub(Operand(scratch), Immediate(FIRST_JS_OBJECT_TYPE));
cmp(scratch, LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE);
j(above, fail);
}
void MacroAssembler::FCmp() {
if (CpuFeatures::IsSupported(CMOV)) {
fucomip();
ffree(0);
fincstp();
} else {
fucompp();
push(eax);
fnstsw_ax();
sahf();
pop(eax);
}
}
void MacroAssembler::AbortIfNotNumber(Register object) {
Label ok;
test(object, Immediate(kSmiTagMask));
j(zero, &ok);
cmp(FieldOperand(object, HeapObject::kMapOffset),
isolate()->factory()->heap_number_map());
Assert(equal, "Operand not a number");
bind(&ok);
}
void MacroAssembler::AbortIfNotSmi(Register object) {
test(object, Immediate(kSmiTagMask));
Assert(equal, "Operand is not a smi");
}
void MacroAssembler::AbortIfNotString(Register object) {
test(object, Immediate(kSmiTagMask));
Assert(not_equal, "Operand is not a string");
push(object);
mov(object, FieldOperand(object, HeapObject::kMapOffset));
CmpInstanceType(object, FIRST_NONSTRING_TYPE);
pop(object);
Assert(below, "Operand is not a string");
}
void MacroAssembler::AbortIfSmi(Register object) {
test(object, Immediate(kSmiTagMask));
Assert(not_equal, "Operand is a smi");
}
void MacroAssembler::EnterFrame(StackFrame::Type type) {
push(ebp);
mov(ebp, Operand(esp));
push(esi);
push(Immediate(Smi::FromInt(type)));
push(Immediate(CodeObject()));
if (emit_debug_code()) {
cmp(Operand(esp, 0), Immediate(isolate()->factory()->undefined_value()));
Check(not_equal, "code object not properly patched");
}
}
void MacroAssembler::LeaveFrame(StackFrame::Type type) {
if (emit_debug_code()) {
cmp(Operand(ebp, StandardFrameConstants::kMarkerOffset),
Immediate(Smi::FromInt(type)));
Check(equal, "stack frame types must match");
}
leave();
}
void MacroAssembler::EnterExitFramePrologue() {
// Setup the frame structure on the stack.
ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize);
ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize);
ASSERT(ExitFrameConstants::kCallerFPOffset == 0 * kPointerSize);
push(ebp);
mov(ebp, Operand(esp));
// Reserve room for entry stack pointer and push the code object.
ASSERT(ExitFrameConstants::kSPOffset == -1 * kPointerSize);
push(Immediate(0)); // Saved entry sp, patched before call.
push(Immediate(CodeObject())); // Accessed from ExitFrame::code_slot.
// Save the frame pointer and the context in top.
ExternalReference c_entry_fp_address(Isolate::k_c_entry_fp_address,
isolate());
ExternalReference context_address(Isolate::k_context_address,
isolate());
mov(Operand::StaticVariable(c_entry_fp_address), ebp);
mov(Operand::StaticVariable(context_address), esi);
}
void MacroAssembler::EnterExitFrameEpilogue(int argc, bool save_doubles) {
// Optionally save all XMM registers.
if (save_doubles) {
CpuFeatures::Scope scope(SSE2);
int space = XMMRegister::kNumRegisters * kDoubleSize + argc * kPointerSize;
sub(Operand(esp), Immediate(space));
const int offset = -2 * kPointerSize;
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
movdbl(Operand(ebp, offset - ((i + 1) * kDoubleSize)), reg);
}
} else {
sub(Operand(esp), Immediate(argc * kPointerSize));
}
// Get the required frame alignment for the OS.
const int kFrameAlignment = OS::ActivationFrameAlignment();
if (kFrameAlignment > 0) {
ASSERT(IsPowerOf2(kFrameAlignment));
and_(esp, -kFrameAlignment);
}
// Patch the saved entry sp.
mov(Operand(ebp, ExitFrameConstants::kSPOffset), esp);
}
void MacroAssembler::EnterExitFrame(bool save_doubles) {
EnterExitFramePrologue();
// Setup argc and argv in callee-saved registers.
int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
mov(edi, Operand(eax));
lea(esi, Operand(ebp, eax, times_4, offset));
// Reserve space for argc, argv and isolate.
EnterExitFrameEpilogue(3, save_doubles);
}
void MacroAssembler::EnterApiExitFrame(int argc) {
EnterExitFramePrologue();
EnterExitFrameEpilogue(argc, false);
}
void MacroAssembler::LeaveExitFrame(bool save_doubles) {
// Optionally restore all XMM registers.
if (save_doubles) {
CpuFeatures::Scope scope(SSE2);
const int offset = -2 * kPointerSize;
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
movdbl(reg, Operand(ebp, offset - ((i + 1) * kDoubleSize)));
}
}
// Get the return address from the stack and restore the frame pointer.
mov(ecx, Operand(ebp, 1 * kPointerSize));
mov(ebp, Operand(ebp, 0 * kPointerSize));
// Pop the arguments and the receiver from the caller stack.
lea(esp, Operand(esi, 1 * kPointerSize));
// Push the return address to get ready to return.
push(ecx);
LeaveExitFrameEpilogue();
}
void MacroAssembler::LeaveExitFrameEpilogue() {
// Restore current context from top and clear it in debug mode.
ExternalReference context_address(Isolate::k_context_address, isolate());
mov(esi, Operand::StaticVariable(context_address));
#ifdef DEBUG
mov(Operand::StaticVariable(context_address), Immediate(0));
#endif
// Clear the top frame.
ExternalReference c_entry_fp_address(Isolate::k_c_entry_fp_address,
isolate());
mov(Operand::StaticVariable(c_entry_fp_address), Immediate(0));
}
void MacroAssembler::LeaveApiExitFrame() {
mov(esp, Operand(ebp));
pop(ebp);
LeaveExitFrameEpilogue();
}
void MacroAssembler::PushTryHandler(CodeLocation try_location,
HandlerType type) {
// Adjust this code if not the case.
ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
// The pc (return address) is already on TOS.
if (try_location == IN_JAVASCRIPT) {
if (type == TRY_CATCH_HANDLER) {
push(Immediate(StackHandler::TRY_CATCH));
} else {
push(Immediate(StackHandler::TRY_FINALLY));
}
push(ebp);
} else {
ASSERT(try_location == IN_JS_ENTRY);
// The frame pointer does not point to a JS frame so we save NULL
// for ebp. We expect the code throwing an exception to check ebp
// before dereferencing it to restore the context.
push(Immediate(StackHandler::ENTRY));
push(Immediate(0)); // NULL frame pointer.
}
// Save the current handler as the next handler.
push(Operand::StaticVariable(ExternalReference(Isolate::k_handler_address,
isolate())));
// Link this handler as the new current one.
mov(Operand::StaticVariable(ExternalReference(Isolate::k_handler_address,
isolate())),
esp);
}
void MacroAssembler::PopTryHandler() {
ASSERT_EQ(0, StackHandlerConstants::kNextOffset);
pop(Operand::StaticVariable(ExternalReference(Isolate::k_handler_address,
isolate())));
add(Operand(esp), Immediate(StackHandlerConstants::kSize - kPointerSize));
}
void MacroAssembler::Throw(Register value) {
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
// eax must hold the exception.
if (!value.is(eax)) {
mov(eax, value);
}
// Drop the sp to the top of the handler.
ExternalReference handler_address(Isolate::k_handler_address,
isolate());
mov(esp, Operand::StaticVariable(handler_address));
// Restore next handler and frame pointer, discard handler state.
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
pop(Operand::StaticVariable(handler_address));
STATIC_ASSERT(StackHandlerConstants::kFPOffset == 1 * kPointerSize);
pop(ebp);
pop(edx); // Remove state.
// Before returning we restore the context from the frame pointer if
// not NULL. The frame pointer is NULL in the exception handler of
// a JS entry frame.
Set(esi, Immediate(0)); // Tentatively set context pointer to NULL.
NearLabel skip;
cmp(ebp, 0);
j(equal, &skip, not_taken);
mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
bind(&skip);
STATIC_ASSERT(StackHandlerConstants::kPCOffset == 3 * kPointerSize);
ret(0);
}
void MacroAssembler::ThrowUncatchable(UncatchableExceptionType type,
Register value) {
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
// eax must hold the exception.
if (!value.is(eax)) {
mov(eax, value);
}
// Drop sp to the top stack handler.
ExternalReference handler_address(Isolate::k_handler_address,
isolate());
mov(esp, Operand::StaticVariable(handler_address));
// Unwind the handlers until the ENTRY handler is found.
NearLabel loop, done;
bind(&loop);
// Load the type of the current stack handler.
const int kStateOffset = StackHandlerConstants::kStateOffset;
cmp(Operand(esp, kStateOffset), Immediate(StackHandler::ENTRY));
j(equal, &done);
// Fetch the next handler in the list.
const int kNextOffset = StackHandlerConstants::kNextOffset;
mov(esp, Operand(esp, kNextOffset));
jmp(&loop);
bind(&done);
// Set the top handler address to next handler past the current ENTRY handler.
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
pop(Operand::StaticVariable(handler_address));
if (type == OUT_OF_MEMORY) {
// Set external caught exception to false.
ExternalReference external_caught(
Isolate::k_external_caught_exception_address,
isolate());
mov(eax, false);
mov(Operand::StaticVariable(external_caught), eax);
// Set pending exception and eax to out of memory exception.
ExternalReference pending_exception(Isolate::k_pending_exception_address,
isolate());
mov(eax, reinterpret_cast<int32_t>(Failure::OutOfMemoryException()));
mov(Operand::StaticVariable(pending_exception), eax);
}
// Clear the context pointer.
Set(esi, Immediate(0));
// Restore fp from handler and discard handler state.
STATIC_ASSERT(StackHandlerConstants::kFPOffset == 1 * kPointerSize);
pop(ebp);
pop(edx); // State.
STATIC_ASSERT(StackHandlerConstants::kPCOffset == 3 * kPointerSize);
ret(0);
}
void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
Register scratch,
Label* miss) {
Label same_contexts;
ASSERT(!holder_reg.is(scratch));
// Load current lexical context from the stack frame.
mov(scratch, Operand(ebp, StandardFrameConstants::kContextOffset));
// When generating debug code, make sure the lexical context is set.
if (emit_debug_code()) {
cmp(Operand(scratch), Immediate(0));
Check(not_equal, "we should not have an empty lexical context");
}
// Load the global context of the current context.
int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
mov(scratch, FieldOperand(scratch, offset));
mov(scratch, FieldOperand(scratch, GlobalObject::kGlobalContextOffset));
// Check the context is a global context.
if (emit_debug_code()) {
push(scratch);
// Read the first word and compare to global_context_map.
mov(scratch, FieldOperand(scratch, HeapObject::kMapOffset));
cmp(scratch, isolate()->factory()->global_context_map());
Check(equal, "JSGlobalObject::global_context should be a global context.");
pop(scratch);
}
// Check if both contexts are the same.
cmp(scratch, FieldOperand(holder_reg, JSGlobalProxy::kContextOffset));
j(equal, &same_contexts, taken);
// Compare security tokens, save holder_reg on the stack so we can use it
// as a temporary register.
//
// TODO(119): avoid push(holder_reg)/pop(holder_reg)
push(holder_reg);
// Check that the security token in the calling global object is
// compatible with the security token in the receiving global
// object.
mov(holder_reg, FieldOperand(holder_reg, JSGlobalProxy::kContextOffset));
// Check the context is a global context.
if (emit_debug_code()) {
cmp(holder_reg, isolate()->factory()->null_value());
Check(not_equal, "JSGlobalProxy::context() should not be null.");
push(holder_reg);
// Read the first word and compare to global_context_map(),
mov(holder_reg, FieldOperand(holder_reg, HeapObject::kMapOffset));
cmp(holder_reg, isolate()->factory()->global_context_map());
Check(equal, "JSGlobalObject::global_context should be a global context.");
pop(holder_reg);
}
int token_offset = Context::kHeaderSize +
Context::SECURITY_TOKEN_INDEX * kPointerSize;
mov(scratch, FieldOperand(scratch, token_offset));
cmp(scratch, FieldOperand(holder_reg, token_offset));
pop(holder_reg);
j(not_equal, miss, not_taken);
bind(&same_contexts);
}
void MacroAssembler::LoadAllocationTopHelper(Register result,
Register scratch,
AllocationFlags flags) {
ExternalReference new_space_allocation_top =
ExternalReference::new_space_allocation_top_address(isolate());
// Just return if allocation top is already known.
if ((flags & RESULT_CONTAINS_TOP) != 0) {
// No use of scratch if allocation top is provided.
ASSERT(scratch.is(no_reg));
#ifdef DEBUG
// Assert that result actually contains top on entry.
cmp(result, Operand::StaticVariable(new_space_allocation_top));
Check(equal, "Unexpected allocation top");
#endif
return;
}
// Move address of new object to result. Use scratch register if available.
if (scratch.is(no_reg)) {
mov(result, Operand::StaticVariable(new_space_allocation_top));
} else {
mov(Operand(scratch), Immediate(new_space_allocation_top));
mov(result, Operand(scratch, 0));
}
}
void MacroAssembler::UpdateAllocationTopHelper(Register result_end,
Register scratch) {
if (emit_debug_code()) {
test(result_end, Immediate(kObjectAlignmentMask));
Check(zero, "Unaligned allocation in new space");
}
ExternalReference new_space_allocation_top =
ExternalReference::new_space_allocation_top_address(isolate());
// Update new top. Use scratch if available.
if (scratch.is(no_reg)) {
mov(Operand::StaticVariable(new_space_allocation_top), result_end);
} else {
mov(Operand(scratch, 0), result_end);
}
}
void MacroAssembler::AllocateInNewSpace(int object_size,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
if (!FLAG_inline_new) {
if (emit_debug_code()) {
// Trash the registers to simulate an allocation failure.
mov(result, Immediate(0x7091));
if (result_end.is_valid()) {
mov(result_end, Immediate(0x7191));
}
if (scratch.is_valid()) {
mov(scratch, Immediate(0x7291));
}
}
jmp(gc_required);
return;
}
ASSERT(!result.is(result_end));
// Load address of new object into result.
LoadAllocationTopHelper(result, scratch, flags);
Register top_reg = result_end.is_valid() ? result_end : result;
// Calculate new top and bail out if new space is exhausted.
ExternalReference new_space_allocation_limit =
ExternalReference::new_space_allocation_limit_address(isolate());
if (!top_reg.is(result)) {
mov(top_reg, result);
}
add(Operand(top_reg), Immediate(object_size));
j(carry, gc_required, not_taken);
cmp(top_reg, Operand::StaticVariable(new_space_allocation_limit));
j(above, gc_required, not_taken);
// Update allocation top.
UpdateAllocationTopHelper(top_reg, scratch);
// Tag result if requested.
if (top_reg.is(result)) {
if ((flags & TAG_OBJECT) != 0) {
sub(Operand(result), Immediate(object_size - kHeapObjectTag));
} else {
sub(Operand(result), Immediate(object_size));
}
} else if ((flags & TAG_OBJECT) != 0) {
add(Operand(result), Immediate(kHeapObjectTag));
}
}
void MacroAssembler::AllocateInNewSpace(int header_size,
ScaleFactor element_size,
Register element_count,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
if (!FLAG_inline_new) {
if (emit_debug_code()) {
// Trash the registers to simulate an allocation failure.
mov(result, Immediate(0x7091));
mov(result_end, Immediate(0x7191));
if (scratch.is_valid()) {
mov(scratch, Immediate(0x7291));
}
// Register element_count is not modified by the function.
}
jmp(gc_required);
return;
}
ASSERT(!result.is(result_end));
// Load address of new object into result.
LoadAllocationTopHelper(result, scratch, flags);
// Calculate new top and bail out if new space is exhausted.
ExternalReference new_space_allocation_limit =
ExternalReference::new_space_allocation_limit_address(isolate());
// We assume that element_count*element_size + header_size does not
// overflow.
lea(result_end, Operand(element_count, element_size, header_size));
add(result_end, Operand(result));
j(carry, gc_required);
cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
j(above, gc_required);
// Tag result if requested.
if ((flags & TAG_OBJECT) != 0) {
lea(result, Operand(result, kHeapObjectTag));
}
// Update allocation top.
UpdateAllocationTopHelper(result_end, scratch);
}
void MacroAssembler::AllocateInNewSpace(Register object_size,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
if (!FLAG_inline_new) {
if (emit_debug_code()) {
// Trash the registers to simulate an allocation failure.
mov(result, Immediate(0x7091));
mov(result_end, Immediate(0x7191));
if (scratch.is_valid()) {
mov(scratch, Immediate(0x7291));
}
// object_size is left unchanged by this function.
}
jmp(gc_required);
return;
}
ASSERT(!result.is(result_end));
// Load address of new object into result.
LoadAllocationTopHelper(result, scratch, flags);
// Calculate new top and bail out if new space is exhausted.
ExternalReference new_space_allocation_limit =
ExternalReference::new_space_allocation_limit_address(isolate());
if (!object_size.is(result_end)) {
mov(result_end, object_size);
}
add(result_end, Operand(result));
j(carry, gc_required, not_taken);
cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
j(above, gc_required, not_taken);
// Tag result if requested.
if ((flags & TAG_OBJECT) != 0) {
lea(result, Operand(result, kHeapObjectTag));
}
// Update allocation top.
UpdateAllocationTopHelper(result_end, scratch);
}
void MacroAssembler::UndoAllocationInNewSpace(Register object) {
ExternalReference new_space_allocation_top =
ExternalReference::new_space_allocation_top_address(isolate());
// Make sure the object has no tag before resetting top.
and_(Operand(object), Immediate(~kHeapObjectTagMask));
#ifdef DEBUG
cmp(object, Operand::StaticVariable(new_space_allocation_top));
Check(below, "Undo allocation of non allocated memory");
#endif
mov(Operand::StaticVariable(new_space_allocation_top), object);
}
void MacroAssembler::AllocateHeapNumber(Register result,
Register scratch1,
Register scratch2,
Label* gc_required) {
// Allocate heap number in new space.
AllocateInNewSpace(HeapNumber::kSize,
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(isolate()->factory()->heap_number_map()));
}
void MacroAssembler::AllocateTwoByteString(Register result,
Register length,
Register scratch1,
Register scratch2,
Register scratch3,
Label* gc_required) {
// Calculate the number of bytes needed for the characters in the string while
// observing object alignment.
ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
ASSERT(kShortSize == 2);
// scratch1 = length * 2 + kObjectAlignmentMask.
lea(scratch1, Operand(length, length, times_1, kObjectAlignmentMask));
and_(Operand(scratch1), Immediate(~kObjectAlignmentMask));
// Allocate two byte string in new space.
AllocateInNewSpace(SeqTwoByteString::kHeaderSize,
times_1,
scratch1,
result,
scratch2,
scratch3,
gc_required,
TAG_OBJECT);
// Set the map, length and hash field.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(isolate()->factory()->string_map()));
mov(scratch1, length);
SmiTag(scratch1);
mov(FieldOperand(result, String::kLengthOffset), scratch1);
mov(FieldOperand(result, String::kHashFieldOffset),
Immediate(String::kEmptyHashField));
}
void MacroAssembler::AllocateAsciiString(Register result,
Register length,
Register scratch1,
Register scratch2,
Register scratch3,
Label* gc_required) {
// Calculate the number of bytes needed for the characters in the string while
// observing object alignment.
ASSERT((SeqAsciiString::kHeaderSize & kObjectAlignmentMask) == 0);
mov(scratch1, length);
ASSERT(kCharSize == 1);
add(Operand(scratch1), Immediate(kObjectAlignmentMask));
and_(Operand(scratch1), Immediate(~kObjectAlignmentMask));
// Allocate ascii string in new space.
AllocateInNewSpace(SeqAsciiString::kHeaderSize,
times_1,
scratch1,
result,
scratch2,
scratch3,
gc_required,
TAG_OBJECT);
// Set the map, length and hash field.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(isolate()->factory()->ascii_string_map()));
mov(scratch1, length);
SmiTag(scratch1);
mov(FieldOperand(result, String::kLengthOffset), scratch1);
mov(FieldOperand(result, String::kHashFieldOffset),
Immediate(String::kEmptyHashField));
}
void MacroAssembler::AllocateAsciiString(Register result,
int length,
Register scratch1,
Register scratch2,
Label* gc_required) {
ASSERT(length > 0);
// Allocate ascii string in new space.
AllocateInNewSpace(SeqAsciiString::SizeFor(length),
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map, length and hash field.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(isolate()->factory()->ascii_string_map()));
mov(FieldOperand(result, String::kLengthOffset),
Immediate(Smi::FromInt(length)));
mov(FieldOperand(result, String::kHashFieldOffset),
Immediate(String::kEmptyHashField));
}
void MacroAssembler::AllocateConsString(Register result,
Register scratch1,
Register scratch2,
Label* gc_required) {
// Allocate heap number in new space.
AllocateInNewSpace(ConsString::kSize,
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map. The other fields are left uninitialized.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(isolate()->factory()->cons_string_map()));
}
void MacroAssembler::AllocateAsciiConsString(Register result,
Register scratch1,
Register scratch2,
Label* gc_required) {
// Allocate heap number in new space.
AllocateInNewSpace(ConsString::kSize,
result,
scratch1,
scratch2,
gc_required,
TAG_OBJECT);
// Set the map. The other fields are left uninitialized.
mov(FieldOperand(result, HeapObject::kMapOffset),
Immediate(isolate()->factory()->cons_ascii_string_map()));
}
// Copy memory, byte-by-byte, from source to destination. Not optimized for
// long or aligned copies. The contents of scratch and length are destroyed.
// Source and destination are incremented by length.
// Many variants of movsb, loop unrolling, word moves, and indexed operands
// have been tried here already, and this is fastest.
// A simpler loop is faster on small copies, but 30% slower on large ones.
// The cld() instruction must have been emitted, to set the direction flag(),
// before calling this function.
void MacroAssembler::CopyBytes(Register source,
Register destination,
Register length,
Register scratch) {
Label loop, done, short_string, short_loop;
// Experimentation shows that the short string loop is faster if length < 10.
cmp(Operand(length), Immediate(10));
j(less_equal, &short_string);
ASSERT(source.is(esi));
ASSERT(destination.is(edi));
ASSERT(length.is(ecx));
// Because source is 4-byte aligned in our uses of this function,
// we keep source aligned for the rep_movs call by copying the odd bytes
// at the end of the ranges.
mov(scratch, Operand(source, length, times_1, -4));
mov(Operand(destination, length, times_1, -4), scratch);
mov(scratch, ecx);
shr(ecx, 2);
rep_movs();
and_(Operand(scratch), Immediate(0x3));
add(destination, Operand(scratch));
jmp(&done);
bind(&short_string);
test(length, Operand(length));
j(zero, &done);
bind(&short_loop);
mov_b(scratch, Operand(source, 0));
mov_b(Operand(destination, 0), scratch);
inc(source);
inc(destination);
dec(length);
j(not_zero, &short_loop);
bind(&done);
}
void MacroAssembler::NegativeZeroTest(CodeGenerator* cgen,
Register result,
Register op,
JumpTarget* then_target) {
JumpTarget ok;
test(result, Operand(result));
ok.Branch(not_zero, taken);
test(op, Operand(op));
then_target->Branch(sign, not_taken);
ok.Bind();
}
void MacroAssembler::NegativeZeroTest(Register result,
Register op,
Label* then_label) {
Label ok;
test(result, Operand(result));
j(not_zero, &ok, taken);
test(op, Operand(op));
j(sign, then_label, not_taken);
bind(&ok);
}
void MacroAssembler::NegativeZeroTest(Register result,
Register op1,
Register op2,
Register scratch,
Label* then_label) {
Label ok;
test(result, Operand(result));
j(not_zero, &ok, taken);
mov(scratch, Operand(op1));
or_(scratch, Operand(op2));
j(sign, then_label, not_taken);
bind(&ok);
}
void MacroAssembler::TryGetFunctionPrototype(Register function,
Register result,
Register scratch,
Label* miss) {
// Check that the receiver isn't a smi.
test(function, Immediate(kSmiTagMask));
j(zero, miss, not_taken);
// Check that the function really is a function.
CmpObjectType(function, JS_FUNCTION_TYPE, result);
j(not_equal, miss, not_taken);
// Make sure that the function has an instance prototype.
Label non_instance;
movzx_b(scratch, FieldOperand(result, Map::kBitFieldOffset));
test(scratch, Immediate(1 << Map::kHasNonInstancePrototype));
j(not_zero, &non_instance, not_taken);
// Get the prototype or initial map from the function.
mov(result,
FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
// If the prototype or initial map is the hole, don't return it and
// simply miss the cache instead. This will allow us to allocate a
// prototype object on-demand in the runtime system.
cmp(Operand(result), Immediate(isolate()->factory()->the_hole_value()));
j(equal, miss, not_taken);
// If the function does not have an initial map, we're done.
Label done;
CmpObjectType(result, MAP_TYPE, scratch);
j(not_equal, &done);
// Get the prototype from the initial map.
mov(result, FieldOperand(result, Map::kPrototypeOffset));
jmp(&done);
// Non-instance prototype: Fetch prototype from constructor field
// in initial map.
bind(&non_instance);
mov(result, FieldOperand(result, Map::kConstructorOffset));
// All done.
bind(&done);
}
void MacroAssembler::CallStub(CodeStub* stub) {
ASSERT(allow_stub_calls()); // Calls are not allowed in some stubs.
call(stub->GetCode(), RelocInfo::CODE_TARGET);
}
MaybeObject* MacroAssembler::TryCallStub(CodeStub* stub) {
ASSERT(allow_stub_calls()); // Calls are not allowed in some stubs.
Object* result;
{ MaybeObject* maybe_result = stub->TryGetCode();
if (!maybe_result->ToObject(&result)) return maybe_result;
}
call(Handle<Code>(Code::cast(result)), RelocInfo::CODE_TARGET);
return result;
}
void MacroAssembler::TailCallStub(CodeStub* stub) {
ASSERT(allow_stub_calls()); // Calls are not allowed in some stubs.
jmp(stub->GetCode(), RelocInfo::CODE_TARGET);
}
MaybeObject* MacroAssembler::TryTailCallStub(CodeStub* stub) {
ASSERT(allow_stub_calls()); // Calls are not allowed in some stubs.
Object* result;
{ MaybeObject* maybe_result = stub->TryGetCode();
if (!maybe_result->ToObject(&result)) return maybe_result;
}
jmp(Handle<Code>(Code::cast(result)), RelocInfo::CODE_TARGET);
return result;
}
void MacroAssembler::StubReturn(int argc) {
ASSERT(argc >= 1 && generating_stub());
ret((argc - 1) * kPointerSize);
}
void MacroAssembler::IllegalOperation(int num_arguments) {
if (num_arguments > 0) {
add(Operand(esp), Immediate(num_arguments * kPointerSize));
}
mov(eax, Immediate(isolate()->factory()->undefined_value()));
}
void MacroAssembler::IndexFromHash(Register hash, Register index) {
// The assert checks that the constants for the maximum number of digits
// for an array index cached in the hash field and the number of bits
// reserved for it does not conflict.
ASSERT(TenToThe(String::kMaxCachedArrayIndexLength) <
(1 << String::kArrayIndexValueBits));
// We want the smi-tagged index in key. kArrayIndexValueMask has zeros in
// the low kHashShift bits.
and_(hash, String::kArrayIndexValueMask);
STATIC_ASSERT(String::kHashShift >= kSmiTagSize && kSmiTag == 0);
if (String::kHashShift > kSmiTagSize) {
shr(hash, String::kHashShift - kSmiTagSize);
}
if (!index.is(hash)) {
mov(index, hash);
}
}
void MacroAssembler::CallRuntime(Runtime::FunctionId id, int num_arguments) {
CallRuntime(Runtime::FunctionForId(id), num_arguments);
}
void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) {
const Runtime::Function* function = Runtime::FunctionForId(id);
Set(eax, Immediate(function->nargs));
mov(ebx, Immediate(ExternalReference(function, isolate())));
CEntryStub ces(1);
ces.SaveDoubles();
CallStub(&ces);
}
MaybeObject* MacroAssembler::TryCallRuntime(Runtime::FunctionId id,
int num_arguments) {
return TryCallRuntime(Runtime::FunctionForId(id), num_arguments);
}
void MacroAssembler::CallRuntime(const 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;
}
// 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.
Set(eax, Immediate(num_arguments));
mov(ebx, Immediate(ExternalReference(f, isolate())));
CEntryStub ces(1);
CallStub(&ces);
}
MaybeObject* MacroAssembler::TryCallRuntime(const Runtime::Function* f,
int num_arguments) {
if (f->nargs >= 0 && f->nargs != num_arguments) {
IllegalOperation(num_arguments);
// Since we did not call the stub, there was no allocation failure.
// Return some non-failure object.
return isolate()->heap()->undefined_value();
}
// 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.
Set(eax, Immediate(num_arguments));
mov(ebx, Immediate(ExternalReference(f, isolate())));
CEntryStub ces(1);
return TryCallStub(&ces);
}
void MacroAssembler::CallExternalReference(ExternalReference ref,
int num_arguments) {
mov(eax, Immediate(num_arguments));
mov(ebx, Immediate(ref));
CEntryStub stub(1);
CallStub(&stub);
}
void MacroAssembler::TailCallExternalReference(const ExternalReference& ext,
int num_arguments,
int result_size) {
// 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.
Set(eax, Immediate(num_arguments));
JumpToExternalReference(ext);
}
MaybeObject* MacroAssembler::TryTailCallExternalReference(
const ExternalReference& ext, int num_arguments, int result_size) {
// 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.
Set(eax, Immediate(num_arguments));
return TryJumpToExternalReference(ext);
}
void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid,
int num_arguments,
int result_size) {
TailCallExternalReference(ExternalReference(fid, isolate()),
num_arguments,
result_size);
}
MaybeObject* MacroAssembler::TryTailCallRuntime(Runtime::FunctionId fid,
int num_arguments,
int result_size) {
return TryTailCallExternalReference(
ExternalReference(fid, isolate()), num_arguments, result_size);
}
// If true, a Handle<T> returned by value from a function with cdecl calling
// convention will be returned directly as a value of location_ field in a
// register eax.
// If false, it is returned as a pointer to a preallocated by caller memory
// region. Pointer to this region should be passed to a function as an
// implicit first argument.
#if defined(USING_BSD_ABI) || defined(__MINGW32__) || defined(__CYGWIN__)
static const bool kReturnHandlesDirectly = true;
#else
static const bool kReturnHandlesDirectly = false;
#endif
Operand ApiParameterOperand(int index) {
return Operand(
esp, (index + (kReturnHandlesDirectly ? 0 : 1)) * kPointerSize);
}
void MacroAssembler::PrepareCallApiFunction(int argc, Register scratch) {
if (kReturnHandlesDirectly) {
EnterApiExitFrame(argc);
// When handles are returned directly we don't have to allocate extra
// space for and pass an out parameter.
} else {
// We allocate two additional slots: return value and pointer to it.
EnterApiExitFrame(argc + 2);
// The argument slots are filled as follows:
//
// n + 1: output cell
// n: arg n
// ...
// 1: arg1
// 0: pointer to the output cell
//
// Note that this is one more "argument" than the function expects
// so the out cell will have to be popped explicitly after returning
// from the function. The out cell contains Handle.
// pointer to out cell.
lea(scratch, Operand(esp, (argc + 1) * kPointerSize));
mov(Operand(esp, 0 * kPointerSize), scratch); // output.
if (emit_debug_code()) {
mov(Operand(esp, (argc + 1) * kPointerSize), Immediate(0)); // out cell.
}
}
}
MaybeObject* MacroAssembler::TryCallApiFunctionAndReturn(ApiFunction* function,
int stack_space) {
ExternalReference next_address =
ExternalReference::handle_scope_next_address();
ExternalReference limit_address =
ExternalReference::handle_scope_limit_address();
ExternalReference level_address =
ExternalReference::handle_scope_level_address();
// Allocate HandleScope in callee-save registers.
mov(ebx, Operand::StaticVariable(next_address));
mov(edi, Operand::StaticVariable(limit_address));
add(Operand::StaticVariable(level_address), Immediate(1));
// Call the api function!
call(function->address(), RelocInfo::RUNTIME_ENTRY);
if (!kReturnHandlesDirectly) {
// The returned value is a pointer to the handle holding the result.
// Dereference this to get to the location.
mov(eax, Operand(eax, 0));
}
Label empty_handle;
Label prologue;
Label promote_scheduled_exception;
Label delete_allocated_handles;
Label leave_exit_frame;
// Check if the result handle holds 0.
test(eax, Operand(eax));
j(zero, &empty_handle, not_taken);
// It was non-zero. Dereference to get the result value.
mov(eax, Operand(eax, 0));
bind(&prologue);
// No more valid handles (the result handle was the last one). Restore
// previous handle scope.
mov(Operand::StaticVariable(next_address), ebx);
sub(Operand::StaticVariable(level_address), Immediate(1));
Assert(above_equal, "Invalid HandleScope level");
cmp(edi, Operand::StaticVariable(limit_address));
j(not_equal, &delete_allocated_handles, not_taken);
bind(&leave_exit_frame);
// Check if the function scheduled an exception.
ExternalReference scheduled_exception_address =
ExternalReference::scheduled_exception_address(isolate());
cmp(Operand::StaticVariable(scheduled_exception_address),
Immediate(isolate()->factory()->the_hole_value()));
j(not_equal, &promote_scheduled_exception, not_taken);
LeaveApiExitFrame();
ret(stack_space * kPointerSize);
bind(&promote_scheduled_exception);
MaybeObject* result =
TryTailCallRuntime(Runtime::kPromoteScheduledException, 0, 1);
if (result->IsFailure()) {
return result;
}
bind(&empty_handle);
// It was zero; the result is undefined.
mov(eax, isolate()->factory()->undefined_value());
jmp(&prologue);
// HandleScope limit has changed. Delete allocated extensions.
ExternalReference delete_extensions =
ExternalReference::delete_handle_scope_extensions(isolate());
bind(&delete_allocated_handles);
mov(Operand::StaticVariable(limit_address), edi);
mov(edi, eax);
mov(Operand(esp, 0), Immediate(ExternalReference::isolate_address()));
mov(eax, Immediate(delete_extensions));
call(Operand(eax));
mov(eax, edi);
jmp(&leave_exit_frame);
return result;
}
void MacroAssembler::JumpToExternalReference(const ExternalReference& ext) {
// Set the entry point and jump to the C entry runtime stub.
mov(ebx, Immediate(ext));
CEntryStub ces(1);
jmp(ces.GetCode(), RelocInfo::CODE_TARGET);
}
MaybeObject* MacroAssembler::TryJumpToExternalReference(
const ExternalReference& ext) {
// Set the entry point and jump to the C entry runtime stub.
mov(ebx, Immediate(ext));
CEntryStub ces(1);
return TryTailCallStub(&ces);
}
void MacroAssembler::InvokePrologue(const ParameterCount& expected,
const ParameterCount& actual,
Handle<Code> code_constant,
const Operand& code_operand,
NearLabel* done,
InvokeFlag flag,
PostCallGenerator* post_call_generator) {
bool definitely_matches = false;
Label invoke;
if (expected.is_immediate()) {
ASSERT(actual.is_immediate());
if (expected.immediate() == actual.immediate()) {
definitely_matches = true;
} else {
mov(eax, actual.immediate());
const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
if (expected.immediate() == sentinel) {
// Don't worry about adapting arguments for builtins 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 {
mov(ebx, 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.
cmp(expected.reg(), actual.immediate());
j(equal, &invoke);
ASSERT(expected.reg().is(ebx));
mov(eax, 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.
cmp(expected.reg(), Operand(actual.reg()));
j(equal, &invoke);
ASSERT(actual.reg().is(eax));
ASSERT(expected.reg().is(ebx));
}
}
if (!definitely_matches) {
Handle<Code> adaptor =
isolate()->builtins()->ArgumentsAdaptorTrampoline();
if (!code_constant.is_null()) {
mov(edx, Immediate(code_constant));
add(Operand(edx), Immediate(Code::kHeaderSize - kHeapObjectTag));
} else if (!code_operand.is_reg(edx)) {
mov(edx, code_operand);
}
if (flag == CALL_FUNCTION) {
call(adaptor, RelocInfo::CODE_TARGET);
if (post_call_generator != NULL) post_call_generator->Generate();
jmp(done);
} else {
jmp(adaptor, RelocInfo::CODE_TARGET);
}
bind(&invoke);
}
}
void MacroAssembler::InvokeCode(const Operand& code,
const ParameterCount& expected,
const ParameterCount& actual,
InvokeFlag flag,
PostCallGenerator* post_call_generator) {
NearLabel done;
InvokePrologue(expected, actual, Handle<Code>::null(), code,
&done, flag, post_call_generator);
if (flag == CALL_FUNCTION) {
call(code);
if (post_call_generator != NULL) post_call_generator->Generate();
} 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,
PostCallGenerator* post_call_generator) {
NearLabel done;
Operand dummy(eax);
InvokePrologue(expected, actual, code, dummy, &done,
flag, post_call_generator);
if (flag == CALL_FUNCTION) {
call(code, rmode);
if (post_call_generator != NULL) post_call_generator->Generate();
} else {
ASSERT(flag == JUMP_FUNCTION);
jmp(code, rmode);
}
bind(&done);
}
void MacroAssembler::InvokeFunction(Register fun,
const ParameterCount& actual,
InvokeFlag flag,
PostCallGenerator* post_call_generator) {
ASSERT(fun.is(edi));
mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
mov(ebx, FieldOperand(edx, SharedFunctionInfo::kFormalParameterCountOffset));
SmiUntag(ebx);
ParameterCount expected(ebx);
InvokeCode(FieldOperand(edi, JSFunction::kCodeEntryOffset),
expected, actual, flag, post_call_generator);
}
void MacroAssembler::InvokeFunction(JSFunction* function,
const ParameterCount& actual,
InvokeFlag flag,
PostCallGenerator* post_call_generator) {
ASSERT(function->is_compiled());
// Get the function and setup the context.
mov(edi, Immediate(Handle<JSFunction>(function)));
mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
ParameterCount expected(function->shared()->formal_parameter_count());
if (V8::UseCrankshaft()) {
// TODO(kasperl): For now, we always call indirectly through the
// code field in the function to allow recompilation to take effect
// without changing any of the call sites.
InvokeCode(FieldOperand(edi, JSFunction::kCodeEntryOffset),
expected, actual, flag, post_call_generator);
} else {
Handle<Code> code(function->code());
InvokeCode(code, expected, actual, RelocInfo::CODE_TARGET,
flag, post_call_generator);
}
}
void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id,
InvokeFlag flag,
PostCallGenerator* post_call_generator) {
// Calls are not allowed in some stubs.
ASSERT(flag == JUMP_FUNCTION || allow_stub_calls());
// Rely on the assertion to check that the number of provided
// arguments match the expected number of arguments. Fake a
// parameter count to avoid emitting code to do the check.
ParameterCount expected(0);
GetBuiltinFunction(edi, id);
InvokeCode(FieldOperand(edi, JSFunction::kCodeEntryOffset),
expected, expected, flag, post_call_generator);
}
void MacroAssembler::GetBuiltinFunction(Register target,
Builtins::JavaScript id) {
// Load the JavaScript builtin function from the builtins object.
mov(target, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
mov(target, FieldOperand(target, GlobalObject::kBuiltinsOffset));
mov(target, FieldOperand(target,
JSBuiltinsObject::OffsetOfFunctionWithId(id)));
}
void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) {
ASSERT(!target.is(edi));
// Load the JavaScript builtin function from the builtins object.
GetBuiltinFunction(edi, id);
// Load the code entry point from the function into the target register.
mov(target, FieldOperand(edi, JSFunction::kCodeEntryOffset));
}
void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
if (context_chain_length > 0) {
// Move up the chain of contexts to the context containing the slot.
mov(dst, Operand(esi, Context::SlotOffset(Context::CLOSURE_INDEX)));
// Load the function context (which is the incoming, outer context).
mov(dst, FieldOperand(dst, JSFunction::kContextOffset));
for (int i = 1; i < context_chain_length; i++) {
mov(dst, Operand(dst, Context::SlotOffset(Context::CLOSURE_INDEX)));
mov(dst, FieldOperand(dst, JSFunction::kContextOffset));
}
} else {
// Slot is in the current function context. Move it into the
// destination register in case we store into it (the write barrier
// cannot be allowed to destroy the context in esi).
mov(dst, esi);
}
// We should not have found a 'with' context by walking the context chain
// (i.e., the static scope chain and runtime context chain do not agree).
// A variable occurring in such a scope should have slot type LOOKUP and
// not CONTEXT.
if (emit_debug_code()) {
cmp(dst, Operand(dst, Context::SlotOffset(Context::FCONTEXT_INDEX)));
Check(equal, "Yo dawg, I heard you liked function contexts "
"so I put function contexts in all your contexts");
}
}
void MacroAssembler::LoadGlobalFunction(int index, Register function) {
// Load the global or builtins object from the current context.
mov(function, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
// Load the global context from the global or builtins object.
mov(function, FieldOperand(function, GlobalObject::kGlobalContextOffset));
// Load the function from the global context.
mov(function, Operand(function, Context::SlotOffset(index)));
}
void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
Register map) {
// Load the initial map. The global functions all have initial maps.
mov(map, FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
if (emit_debug_code()) {
Label ok, fail;
CheckMap(map, isolate()->factory()->meta_map(), &fail, false);
jmp(&ok);
bind(&fail);
Abort("Global functions must have initial map");
bind(&ok);
}
}
// Store the value in register src in the safepoint register stack
// slot for register dst.
void MacroAssembler::StoreToSafepointRegisterSlot(Register dst, Register src) {
mov(SafepointRegisterSlot(dst), src);
}
void MacroAssembler::StoreToSafepointRegisterSlot(Register dst, Immediate src) {
mov(SafepointRegisterSlot(dst), src);
}
void MacroAssembler::LoadFromSafepointRegisterSlot(Register dst, Register src) {
mov(dst, SafepointRegisterSlot(src));
}
Operand MacroAssembler::SafepointRegisterSlot(Register reg) {
return Operand(esp, SafepointRegisterStackIndex(reg.code()) * kPointerSize);
}
int MacroAssembler::SafepointRegisterStackIndex(int reg_code) {
// The registers are pushed starting with the lowest encoding,
// which means that lowest encodings are furthest away from
// the stack pointer.
ASSERT(reg_code >= 0 && reg_code < kNumSafepointRegisters);
return kNumSafepointRegisters - reg_code - 1;
}
void MacroAssembler::Ret() {
ret(0);
}
void MacroAssembler::Ret(int bytes_dropped, Register scratch) {
if (is_uint16(bytes_dropped)) {
ret(bytes_dropped);
} else {
pop(scratch);
add(Operand(esp), Immediate(bytes_dropped));
push(scratch);
ret(0);
}
}
void MacroAssembler::Drop(int stack_elements) {
if (stack_elements > 0) {
add(Operand(esp), Immediate(stack_elements * kPointerSize));
}
}
void MacroAssembler::Move(Register dst, Register src) {
if (!dst.is(src)) {
mov(dst, src);
}
}
void MacroAssembler::Move(Register dst, Handle<Object> value) {
mov(dst, value);
}
void MacroAssembler::SetCounter(StatsCounter* counter, int value) {
if (FLAG_native_code_counters && counter->Enabled()) {
mov(Operand::StaticVariable(ExternalReference(counter)), Immediate(value));
}
}
void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) {
ASSERT(value > 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand operand = Operand::StaticVariable(ExternalReference(counter));
if (value == 1) {
inc(operand);
} else {
add(operand, Immediate(value));
}
}
}
void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) {
ASSERT(value > 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand operand = Operand::StaticVariable(ExternalReference(counter));
if (value == 1) {
dec(operand);
} else {
sub(operand, Immediate(value));
}
}
}
void MacroAssembler::IncrementCounter(Condition cc,
StatsCounter* counter,
int value) {
ASSERT(value > 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Label skip;
j(NegateCondition(cc), &skip);
pushfd();
IncrementCounter(counter, value);
popfd();
bind(&skip);
}
}
void MacroAssembler::DecrementCounter(Condition cc,
StatsCounter* counter,
int value) {
ASSERT(value > 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Label skip;
j(NegateCondition(cc), &skip);
pushfd();
DecrementCounter(counter, value);
popfd();
bind(&skip);
}
}
void MacroAssembler::Assert(Condition cc, const char* msg) {
if (emit_debug_code()) Check(cc, msg);
}
void MacroAssembler::AssertFastElements(Register elements) {
if (emit_debug_code()) {
Factory* factory = isolate()->factory();
Label ok;
cmp(FieldOperand(elements, HeapObject::kMapOffset),
Immediate(factory->fixed_array_map()));
j(equal, &ok);
cmp(FieldOperand(elements, HeapObject::kMapOffset),
Immediate(factory->fixed_cow_array_map()));
j(equal, &ok);
Abort("JSObject with fast elements map has slow elements");
bind(&ok);
}
}
void MacroAssembler::Check(Condition cc, const char* msg) {
Label L;
j(cc, &L, taken);
Abort(msg);
// will not return here
bind(&L);
}
void MacroAssembler::CheckStackAlignment() {
int frame_alignment = OS::ActivationFrameAlignment();
int frame_alignment_mask = frame_alignment - 1;
if (frame_alignment > kPointerSize) {
ASSERT(IsPowerOf2(frame_alignment));
Label alignment_as_expected;
test(esp, Immediate(frame_alignment_mask));
j(zero, &alignment_as_expected);
// Abort if stack is not aligned.
int3();
bind(&alignment_as_expected);
}
}
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;
ASSERT(reinterpret_cast<Object*>(p0)->IsSmi());
#ifdef DEBUG
if (msg != NULL) {
RecordComment("Abort message: ");
RecordComment(msg);
}
#endif
// Disable stub call restrictions to always allow calls to abort.
AllowStubCallsScope allow_scope(this, true);
push(eax);
push(Immediate(p0));
push(Immediate(reinterpret_cast<intptr_t>(Smi::FromInt(p1 - p0))));
CallRuntime(Runtime::kAbort, 2);
// will not return here
int3();
}
void MacroAssembler::JumpIfNotNumber(Register reg,
TypeInfo info,
Label* on_not_number) {
if (emit_debug_code()) AbortIfSmi(reg);
if (!info.IsNumber()) {
cmp(FieldOperand(reg, HeapObject::kMapOffset),
isolate()->factory()->heap_number_map());
j(not_equal, on_not_number);
}
}
void MacroAssembler::ConvertToInt32(Register dst,
Register source,
Register scratch,
TypeInfo info,
Label* on_not_int32) {
if (emit_debug_code()) {
AbortIfSmi(source);
AbortIfNotNumber(source);
}
if (info.IsInteger32()) {
cvttsd2si(dst, FieldOperand(source, HeapNumber::kValueOffset));
} else {
Label done;
bool push_pop = (scratch.is(no_reg) && dst.is(source));
ASSERT(!scratch.is(source));
if (push_pop) {
push(dst);
scratch = dst;
}
if (scratch.is(no_reg)) scratch = dst;
cvttsd2si(scratch, FieldOperand(source, HeapNumber::kValueOffset));
cmp(scratch, 0x80000000u);
if (push_pop) {
j(not_equal, &done);
pop(dst);
jmp(on_not_int32);
} else {
j(equal, on_not_int32);
}
bind(&done);
if (push_pop) {
add(Operand(esp), Immediate(kPointerSize)); // Pop.
}
if (!scratch.is(dst)) {
mov(dst, scratch);
}
}
}
void MacroAssembler::LoadPowerOf2(XMMRegister dst,
Register scratch,
int power) {
ASSERT(is_uintn(power + HeapNumber::kExponentBias,
HeapNumber::kExponentBits));
mov(scratch, Immediate(power + HeapNumber::kExponentBias));
movd(dst, Operand(scratch));
psllq(dst, HeapNumber::kMantissaBits);
}
void MacroAssembler::JumpIfInstanceTypeIsNotSequentialAscii(
Register instance_type,
Register scratch,
Label* failure) {
if (!scratch.is(instance_type)) {
mov(scratch, instance_type);
}
and_(scratch,
kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask);
cmp(scratch, kStringTag | kSeqStringTag | kAsciiStringTag);
j(not_equal, failure);
}
void MacroAssembler::JumpIfNotBothSequentialAsciiStrings(Register object1,
Register object2,
Register scratch1,
Register scratch2,
Label* failure) {
// Check that both objects are not smis.
ASSERT_EQ(0, kSmiTag);
mov(scratch1, Operand(object1));
and_(scratch1, Operand(object2));
test(scratch1, Immediate(kSmiTagMask));
j(zero, failure);
// Load instance type for both strings.
mov(scratch1, FieldOperand(object1, HeapObject::kMapOffset));
mov(scratch2, FieldOperand(object2, HeapObject::kMapOffset));
movzx_b(scratch1, FieldOperand(scratch1, Map::kInstanceTypeOffset));
movzx_b(scratch2, FieldOperand(scratch2, Map::kInstanceTypeOffset));
// Check that both are flat ascii strings.
const int kFlatAsciiStringMask =
kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask;
const int kFlatAsciiStringTag = ASCII_STRING_TYPE;
// Interleave bits from both instance types and compare them in one check.
ASSERT_EQ(0, kFlatAsciiStringMask & (kFlatAsciiStringMask << 3));
and_(scratch1, kFlatAsciiStringMask);
and_(scratch2, kFlatAsciiStringMask);
lea(scratch1, Operand(scratch1, scratch2, times_8, 0));
cmp(scratch1, kFlatAsciiStringTag | (kFlatAsciiStringTag << 3));
j(not_equal, failure);
}
void MacroAssembler::PrepareCallCFunction(int num_arguments, Register scratch) {
int frame_alignment = OS::ActivationFrameAlignment();
if (frame_alignment != 0) {
// Make stack end at alignment and make room for num_arguments words
// and the original value of esp.
mov(scratch, esp);
sub(Operand(esp), Immediate((num_arguments + 1) * kPointerSize));
ASSERT(IsPowerOf2(frame_alignment));
and_(esp, -frame_alignment);
mov(Operand(esp, num_arguments * kPointerSize), scratch);
} else {
sub(Operand(esp), Immediate(num_arguments * kPointerSize));
}
}
void MacroAssembler::CallCFunction(ExternalReference function,
int num_arguments) {
// Trashing eax is ok as it will be the return value.
mov(Operand(eax), Immediate(function));
CallCFunction(eax, num_arguments);
}
void MacroAssembler::CallCFunction(Register function,
int num_arguments) {
// Check stack alignment.
if (emit_debug_code()) {
CheckStackAlignment();
}
call(Operand(function));
if (OS::ActivationFrameAlignment() != 0) {
mov(esp, Operand(esp, num_arguments * kPointerSize));
} else {
add(Operand(esp), Immediate(num_arguments * kPointerSize));
}
}
CodePatcher::CodePatcher(byte* address, int size)
: address_(address),
size_(size),
masm_(Isolate::Current(), address, size + Assembler::kGap) {
// Create a new macro assembler pointing to the address of the code to patch.
// The size is adjusted with kGap on order for the assembler to generate size
// bytes of instructions without failing with buffer size constraints.
ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
}
CodePatcher::~CodePatcher() {
// Indicate that code has changed.
CPU::FlushICache(address_, size_);
// Check that the code was patched as expected.
ASSERT(masm_.pc_ == address_ + size_);
ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
}
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_IA32