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// Copyright 2015 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_INTERPRETER_INTERPRETER_H_
#define V8_INTERPRETER_INTERPRETER_H_
#include <memory>
// Clients of this interface shouldn't depend on lots of interpreter internals.
// Do not include anything from src/interpreter other than
// src/interpreter/bytecodes.h here!
#include "src/base/macros.h"
#include "src/builtins/builtins.h"
#include "src/interpreter/bytecodes.h"
#include "src/runtime/runtime.h"
namespace v8 {
namespace internal {
class BytecodeArray;
class Callable;
class UnoptimizedCompilationJob;
class FunctionLiteral;
class Isolate;
class ParseInfo;
class RootVisitor;
class SetupIsolateDelegate;
template <typename>
class ZoneVector;
namespace interpreter {
class InterpreterAssembler;
class Interpreter {
public:
explicit Interpreter(Isolate* isolate);
virtual ~Interpreter() = default;
// Returns the interrupt budget which should be used for the profiler counter.
V8_EXPORT_PRIVATE static int InterruptBudget();
// Creates a compilation job which will generate bytecode for |literal|.
// Additionally, if |eager_inner_literals| is not null, adds any eagerly
// compilable inner FunctionLiterals to this list.
static std::unique_ptr<UnoptimizedCompilationJob> NewCompilationJob(
ParseInfo* parse_info, FunctionLiteral* literal,
AccountingAllocator* allocator,
std::vector<FunctionLiteral*>* eager_inner_literals);
// Creates a compilation job which will generate source positions for
// |literal| and when finalized, store the result into |existing_bytecode|.
static std::unique_ptr<UnoptimizedCompilationJob>
NewSourcePositionCollectionJob(ParseInfo* parse_info,
FunctionLiteral* literal,
Handle<BytecodeArray> existing_bytecode,
AccountingAllocator* allocator);
// If the bytecode handler for |bytecode| and |operand_scale| has not yet
// been loaded, deserialize it. Then return the handler.
V8_EXPORT_PRIVATE Code GetBytecodeHandler(Bytecode bytecode,
OperandScale operand_scale);
// Set the bytecode handler for |bytecode| and |operand_scale|.
void SetBytecodeHandler(Bytecode bytecode, OperandScale operand_scale,
Code handler);
// GC support.
void IterateDispatchTable(RootVisitor* v);
// Disassembler support.
V8_EXPORT_PRIVATE const char* LookupNameOfBytecodeHandler(const Code code);
V8_EXPORT_PRIVATE Local<v8::Object> GetDispatchCountersObject();
void ForEachBytecode(const std::function<void(Bytecode, OperandScale)>& f);
void Initialize();
bool IsDispatchTableInitialized() const;
Address dispatch_table_address() {
return reinterpret_cast<Address>(&dispatch_table_[0]);
}
Address bytecode_dispatch_counters_table() {
return reinterpret_cast<Address>(bytecode_dispatch_counters_table_.get());
}
Address address_of_interpreter_entry_trampoline_instruction_start() const {
return reinterpret_cast<Address>(
&interpreter_entry_trampoline_instruction_start_);
}
private:
friend class SetupInterpreter;
friend class v8::internal::SetupIsolateDelegate;
uintptr_t GetDispatchCounter(Bytecode from, Bytecode to) const;
// Get dispatch table index of bytecode.
static size_t GetDispatchTableIndex(Bytecode bytecode,
OperandScale operand_scale);
static const int kNumberOfWideVariants = BytecodeOperands::kOperandScaleCount;
static const int kDispatchTableSize = kNumberOfWideVariants * (kMaxUInt8 + 1);
static const int kNumberOfBytecodes = static_cast<int>(Bytecode::kLast) + 1;
Isolate* isolate_;
Address dispatch_table_[kDispatchTableSize];
std::unique_ptr<uintptr_t[]> bytecode_dispatch_counters_table_;
Address interpreter_entry_trampoline_instruction_start_;
DISALLOW_COPY_AND_ASSIGN(Interpreter);
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_INTERPRETER_H_