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// Copyright 2018 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_WASM_FUNCTION_COMPILER_H_
#define V8_WASM_FUNCTION_COMPILER_H_
#include "src/code-desc.h"
#include "src/trap-handler/trap-handler.h"
#include "src/wasm/compilation-environment.h"
#include "src/wasm/function-body-decoder.h"
#include "src/wasm/wasm-limits.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-tier.h"
namespace v8 {
namespace internal {
class AssemblerBuffer;
class Counters;
namespace compiler {
class Pipeline;
class TurbofanWasmCompilationUnit;
} // namespace compiler
namespace wasm {
class LiftoffCompilationUnit;
class NativeModule;
class WasmCode;
class WasmCompilationUnit;
class WasmEngine;
struct WasmFunction;
class WasmInstructionBuffer final {
public:
~WasmInstructionBuffer();
std::unique_ptr<AssemblerBuffer> CreateView();
std::unique_ptr<uint8_t[]> ReleaseBuffer();
static std::unique_ptr<WasmInstructionBuffer> New();
private:
WasmInstructionBuffer() = delete;
DISALLOW_COPY_AND_ASSIGN(WasmInstructionBuffer);
};
struct WasmCompilationResult {
public:
MOVE_ONLY_WITH_DEFAULT_CONSTRUCTORS(WasmCompilationResult);
explicit WasmCompilationResult(WasmError error) : error(std::move(error)) {}
bool succeeded() const {
DCHECK_EQ(code_desc.buffer != nullptr, error.empty());
return error.empty();
}
operator bool() const { return succeeded(); }
CodeDesc code_desc;
std::unique_ptr<uint8_t[]> instr_buffer;
uint32_t frame_slot_count = 0;
uint32_t tagged_parameter_slots = 0;
OwnedVector<byte> source_positions;
OwnedVector<trap_handler::ProtectedInstructionData> protected_instructions;
WasmError error;
};
class WasmCompilationUnit final {
public:
static ExecutionTier GetDefaultExecutionTier(const WasmModule*);
// If constructing from a background thread, pass in a Counters*, and ensure
// that the Counters live at least as long as this compilation unit (which
// typically means to hold a std::shared_ptr<Counters>).
// If used exclusively from a foreground thread, Isolate::counters() may be
// used by callers to pass Counters.
WasmCompilationUnit(WasmEngine*, int index, ExecutionTier);
~WasmCompilationUnit();
WasmCompilationResult ExecuteCompilation(
CompilationEnv*, const std::shared_ptr<WireBytesStorage>&, Counters*,
WasmFeatures* detected);
WasmCode* Publish(WasmCompilationResult, NativeModule*);
ExecutionTier requested_tier() const { return requested_tier_; }
ExecutionTier executed_tier() const { return executed_tier_; }
static void CompileWasmFunction(Isolate*, NativeModule*,
WasmFeatures* detected, const WasmFunction*,
ExecutionTier);
private:
friend class LiftoffCompilationUnit;
friend class compiler::TurbofanWasmCompilationUnit;
WasmEngine* const wasm_engine_;
const int func_index_;
ExecutionTier requested_tier_;
ExecutionTier executed_tier_;
// LiftoffCompilationUnit, set if {tier_ == kLiftoff}.
std::unique_ptr<LiftoffCompilationUnit> liftoff_unit_;
// TurbofanWasmCompilationUnit, set if {tier_ == kTurbofan}.
std::unique_ptr<compiler::TurbofanWasmCompilationUnit> turbofan_unit_;
void SwitchTier(ExecutionTier new_tier);
DISALLOW_COPY_AND_ASSIGN(WasmCompilationUnit);
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_FUNCTION_COMPILER_H_
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