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// Copyright 2013 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.
#include "src/lithium-codegen.h"
#include <sstream>
#include "src/v8.h"
#if V8_TARGET_ARCH_IA32
#include "src/ia32/lithium-ia32.h" // NOLINT
#include "src/ia32/lithium-codegen-ia32.h" // NOLINT
#elif V8_TARGET_ARCH_X64
#include "src/x64/lithium-x64.h" // NOLINT
#include "src/x64/lithium-codegen-x64.h" // NOLINT
#elif V8_TARGET_ARCH_ARM
#include "src/arm/lithium-arm.h" // NOLINT
#include "src/arm/lithium-codegen-arm.h" // NOLINT
#elif V8_TARGET_ARCH_ARM64
#include "src/arm64/lithium-arm64.h" // NOLINT
#include "src/arm64/lithium-codegen-arm64.h" // NOLINT
#elif V8_TARGET_ARCH_MIPS
#include "src/mips/lithium-mips.h" // NOLINT
#include "src/mips/lithium-codegen-mips.h" // NOLINT
#elif V8_TARGET_ARCH_MIPS64
#include "src/mips64/lithium-mips64.h" // NOLINT
#include "src/mips64/lithium-codegen-mips64.h" // NOLINT
#elif V8_TARGET_ARCH_X87
#include "src/x87/lithium-x87.h" // NOLINT
#include "src/x87/lithium-codegen-x87.h" // NOLINT
#else
#error Unsupported target architecture.
#endif
namespace v8 {
namespace internal {
HGraph* LCodeGenBase::graph() const {
return chunk()->graph();
}
LCodeGenBase::LCodeGenBase(LChunk* chunk,
MacroAssembler* assembler,
CompilationInfo* info)
: chunk_(static_cast<LPlatformChunk*>(chunk)),
masm_(assembler),
info_(info),
zone_(info->zone()),
status_(UNUSED),
current_block_(-1),
current_instruction_(-1),
instructions_(chunk->instructions()),
last_lazy_deopt_pc_(0) {
}
bool LCodeGenBase::GenerateBody() {
DCHECK(is_generating());
bool emit_instructions = true;
LCodeGen* codegen = static_cast<LCodeGen*>(this);
for (current_instruction_ = 0;
!is_aborted() && current_instruction_ < instructions_->length();
current_instruction_++) {
LInstruction* instr = instructions_->at(current_instruction_);
// Don't emit code for basic blocks with a replacement.
if (instr->IsLabel()) {
emit_instructions = !LLabel::cast(instr)->HasReplacement() &&
(!FLAG_unreachable_code_elimination ||
instr->hydrogen_value()->block()->IsReachable());
if (FLAG_code_comments && !emit_instructions) {
Comment(
";;; <@%d,#%d> -------------------- B%d (unreachable/replaced) "
"--------------------",
current_instruction_,
instr->hydrogen_value()->id(),
instr->hydrogen_value()->block()->block_id());
}
}
if (!emit_instructions) continue;
if (FLAG_code_comments && instr->HasInterestingComment(codegen)) {
Comment(";;; <@%d,#%d> %s",
current_instruction_,
instr->hydrogen_value()->id(),
instr->Mnemonic());
}
GenerateBodyInstructionPre(instr);
HValue* value = instr->hydrogen_value();
if (!value->position().IsUnknown()) {
RecordAndWritePosition(
chunk()->graph()->SourcePositionToScriptPosition(value->position()));
}
instr->CompileToNative(codegen);
GenerateBodyInstructionPost(instr);
}
EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
last_lazy_deopt_pc_ = masm()->pc_offset();
return !is_aborted();
}
void LCodeGenBase::CheckEnvironmentUsage() {
#ifdef DEBUG
bool dead_block = false;
for (int i = 0; i < instructions_->length(); i++) {
LInstruction* instr = instructions_->at(i);
HValue* hval = instr->hydrogen_value();
if (instr->IsLabel()) dead_block = LLabel::cast(instr)->HasReplacement();
if (dead_block || !hval->block()->IsReachable()) continue;
HInstruction* hinstr = HInstruction::cast(hval);
if (!hinstr->CanDeoptimize() && instr->HasEnvironment()) {
V8_Fatal(__FILE__, __LINE__, "CanDeoptimize is wrong for %s (%s)",
hinstr->Mnemonic(), instr->Mnemonic());
}
if (instr->HasEnvironment() && !instr->environment()->has_been_used()) {
V8_Fatal(__FILE__, __LINE__, "unused environment for %s (%s)",
hinstr->Mnemonic(), instr->Mnemonic());
}
}
#endif
}
void LCodeGenBase::Comment(const char* format, ...) {
if (!FLAG_code_comments) return;
char buffer[4 * KB];
StringBuilder builder(buffer, arraysize(buffer));
va_list arguments;
va_start(arguments, format);
builder.AddFormattedList(format, arguments);
va_end(arguments);
// Copy the string before recording it in the assembler to avoid
// issues when the stack allocated buffer goes out of scope.
size_t length = builder.position();
Vector<char> copy = Vector<char>::New(static_cast<int>(length) + 1);
MemCopy(copy.start(), builder.Finalize(), copy.length());
masm()->RecordComment(copy.start());
}
void LCodeGenBase::DeoptComment(const Deoptimizer::Reason& reason) {
std::ostringstream os;
os << ";;; deoptimize at " << HSourcePosition(reason.raw_position) << " "
<< reason.mnemonic;
if (reason.detail != NULL) os << ": " << reason.detail;
Comment("%s", os.str().c_str());
}
int LCodeGenBase::GetNextEmittedBlock() const {
for (int i = current_block_ + 1; i < graph()->blocks()->length(); ++i) {
if (!graph()->blocks()->at(i)->IsReachable()) continue;
if (!chunk_->GetLabel(i)->HasReplacement()) return i;
}
return -1;
}
static void AddWeakObjectToCodeDependency(Isolate* isolate,
Handle<Object> object,
Handle<Code> code) {
Heap* heap = isolate->heap();
heap->EnsureWeakObjectToCodeTable();
Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(object));
dep = DependentCode::Insert(dep, DependentCode::kWeakCodeGroup, code);
heap->AddWeakObjectToCodeDependency(object, dep);
}
void LCodeGenBase::RegisterWeakObjectsInOptimizedCode(Handle<Code> code) {
DCHECK(code->is_optimized_code());
ZoneList<Handle<Map> > maps(1, zone());
ZoneList<Handle<JSObject> > objects(1, zone());
ZoneList<Handle<Cell> > cells(1, zone());
int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
RelocInfo::ModeMask(RelocInfo::CELL);
for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
RelocInfo::Mode mode = it.rinfo()->rmode();
if (mode == RelocInfo::CELL &&
code->IsWeakObjectInOptimizedCode(it.rinfo()->target_cell())) {
Handle<Cell> cell(it.rinfo()->target_cell());
cells.Add(cell, zone());
} else if (mode == RelocInfo::EMBEDDED_OBJECT &&
code->IsWeakObjectInOptimizedCode(it.rinfo()->target_object())) {
if (it.rinfo()->target_object()->IsMap()) {
Handle<Map> map(Map::cast(it.rinfo()->target_object()));
maps.Add(map, zone());
} else if (it.rinfo()->target_object()->IsJSObject()) {
Handle<JSObject> object(JSObject::cast(it.rinfo()->target_object()));
objects.Add(object, zone());
} else if (it.rinfo()->target_object()->IsCell()) {
Handle<Cell> cell(Cell::cast(it.rinfo()->target_object()));
cells.Add(cell, zone());
}
}
}
if (FLAG_enable_ool_constant_pool) {
code->constant_pool()->set_weak_object_state(
ConstantPoolArray::WEAK_OBJECTS_IN_OPTIMIZED_CODE);
}
#ifdef VERIFY_HEAP
// This disables verification of weak embedded objects after full GC.
// AddDependentCode can cause a GC, which would observe the state where
// this code is not yet in the depended code lists of the embedded maps.
NoWeakObjectVerificationScope disable_verification_of_embedded_objects;
#endif
for (int i = 0; i < maps.length(); i++) {
Map::AddDependentCode(maps.at(i), DependentCode::kWeakCodeGroup, code);
}
for (int i = 0; i < objects.length(); i++) {
AddWeakObjectToCodeDependency(isolate(), objects.at(i), code);
}
for (int i = 0; i < cells.length(); i++) {
AddWeakObjectToCodeDependency(isolate(), cells.at(i), code);
}
}
void LCodeGenBase::Abort(BailoutReason reason) {
info()->AbortOptimization(reason);
status_ = ABORTED;
}
void LCodeGenBase::Retry(BailoutReason reason) {
info()->RetryOptimization(reason);
status_ = ABORTED;
}
void LCodeGenBase::AddDeprecationDependency(Handle<Map> map) {
if (map->is_deprecated()) return Retry(kMapBecameDeprecated);
chunk_->AddDeprecationDependency(map);
}
void LCodeGenBase::AddStabilityDependency(Handle<Map> map) {
if (!map->is_stable()) return Retry(kMapBecameUnstable);
chunk_->AddStabilityDependency(map);
}
} } // namespace v8::internal
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