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// Copyright 2021 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.
#ifndef V8_DEOPTIMIZER_TRANSLATION_ARRAY_H_
#define V8_DEOPTIMIZER_TRANSLATION_ARRAY_H_
#include "src/codegen/register-arch.h"
#include "src/deoptimizer/translation-opcode.h"
#include "src/objects/fixed-array.h"
#include "src/zone/zone-containers.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/wasm/value-type.h"
#endif // V8_ENABLE_WEBASSEMBLY
namespace v8 {
namespace internal {
class Factory;
// The TranslationArray is the on-heap representation of translations created
// during code generation in a (zone-allocated) TranslationArrayBuilder. The
// translation array specifies how to transform an optimized frame back into
// one or more unoptimized frames.
// TODO(jgruber): Consider a real type instead of this type alias.
using TranslationArray = ByteArray;
class TranslationArrayIterator {
public:
TranslationArrayIterator(TranslationArray buffer, int index);
int32_t Next();
bool HasNext() const;
void Skip(int n) {
for (int i = 0; i < n; i++) Next();
}
private:
std::vector<int32_t> uncompressed_contents_;
TranslationArray buffer_;
int index_;
};
class TranslationArrayBuilder {
public:
explicit TranslationArrayBuilder(Zone* zone)
: contents_(zone), contents_for_compression_(zone), zone_(zone) {}
Handle<TranslationArray> ToTranslationArray(Factory* factory);
int BeginTranslation(int frame_count, int jsframe_count,
int update_feedback_count) {
int start_index = Size();
auto opcode = TranslationOpcode::BEGIN;
Add(opcode);
Add(frame_count);
Add(jsframe_count);
Add(update_feedback_count);
DCHECK_EQ(TranslationOpcodeOperandCount(opcode), 3);
return start_index;
}
void BeginInterpretedFrame(BytecodeOffset bytecode_offset, int literal_id,
unsigned height, int return_value_offset,
int return_value_count);
void BeginArgumentsAdaptorFrame(int literal_id, unsigned height);
void BeginConstructStubFrame(BytecodeOffset bailout_id, int literal_id,
unsigned height);
void BeginBuiltinContinuationFrame(BytecodeOffset bailout_id, int literal_id,
unsigned height);
#if V8_ENABLE_WEBASSEMBLY
void BeginJSToWasmBuiltinContinuationFrame(
BytecodeOffset bailout_id, int literal_id, unsigned height,
base::Optional<wasm::ValueKind> return_kind);
#endif // V8_ENABLE_WEBASSEMBLY
void BeginJavaScriptBuiltinContinuationFrame(BytecodeOffset bailout_id,
int literal_id, unsigned height);
void BeginJavaScriptBuiltinContinuationWithCatchFrame(
BytecodeOffset bailout_id, int literal_id, unsigned height);
void ArgumentsElements(CreateArgumentsType type);
void ArgumentsLength();
void BeginCapturedObject(int length);
void AddUpdateFeedback(int vector_literal, int slot);
void DuplicateObject(int object_index);
void StoreRegister(Register reg);
void StoreInt32Register(Register reg);
void StoreInt64Register(Register reg);
void StoreUint32Register(Register reg);
void StoreBoolRegister(Register reg);
void StoreFloatRegister(FloatRegister reg);
void StoreDoubleRegister(DoubleRegister reg);
void StoreStackSlot(int index);
void StoreInt32StackSlot(int index);
void StoreInt64StackSlot(int index);
void StoreUint32StackSlot(int index);
void StoreBoolStackSlot(int index);
void StoreFloatStackSlot(int index);
void StoreDoubleStackSlot(int index);
void StoreLiteral(int literal_id);
void StoreJSFrameFunction();
private:
void Add(int32_t value);
void Add(TranslationOpcode opcode) { Add(static_cast<int32_t>(opcode)); }
int Size() const {
return V8_UNLIKELY(FLAG_turbo_compress_translation_arrays)
? static_cast<int>(contents_for_compression_.size())
: static_cast<int>(contents_.size());
}
int SizeInBytes() const {
return V8_UNLIKELY(FLAG_turbo_compress_translation_arrays)
? Size() * kInt32Size
: Size();
}
Zone* zone() const { return zone_; }
ZoneVector<uint8_t> contents_;
ZoneVector<int32_t> contents_for_compression_;
Zone* const zone_;
};
} // namespace internal
} // namespace v8
#endif // V8_DEOPTIMIZER_TRANSLATION_ARRAY_H_
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