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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_WASM_ENCODER_H_
#define V8_WASM_ENCODER_H_
#include "src/signature.h"
#include "src/zone-containers.h"
#include "src/base/smart-pointers.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-opcodes.h"
#include "src/wasm/wasm-result.h"
namespace v8 {
namespace internal {
namespace wasm {
class WasmModuleBuilder;
class WasmFunctionEncoder : public ZoneObject {
public:
uint32_t HeaderSize() const;
uint32_t BodySize() const;
uint32_t NameSize() const;
void Serialize(byte* buffer, byte** header, byte** body) const;
private:
WasmFunctionEncoder(Zone* zone, LocalType return_type, bool exported,
bool external);
friend class WasmFunctionBuilder;
uint16_t signature_index_;
ZoneVector<LocalType> params_;
uint16_t local_int32_count_;
uint16_t local_int64_count_;
uint16_t local_float32_count_;
uint16_t local_float64_count_;
bool exported_;
bool external_;
ZoneVector<uint8_t> body_;
ZoneVector<char> name_;
bool HasLocals() const {
return (local_int32_count_ + local_int64_count_ + local_float32_count_ +
local_float64_count_) > 0;
}
bool HasName() const { return exported_ && name_.size() > 0; }
};
class WasmFunctionBuilder : public ZoneObject {
public:
uint16_t AddParam(LocalType type);
uint16_t AddLocal(LocalType type);
void ReturnType(LocalType type);
void EmitCode(const byte* code, uint32_t code_size);
void EmitCode(const byte* code, uint32_t code_size,
const uint32_t* local_indices, uint32_t indices_size);
void Emit(WasmOpcode opcode);
void EmitWithU8(WasmOpcode opcode, const byte immediate);
void EmitWithLocal(WasmOpcode opcode);
uint32_t EmitEditableImmediate(const byte immediate);
void EditImmediate(uint32_t offset, const byte immediate);
void Exported(uint8_t flag);
void External(uint8_t flag);
void SetName(const unsigned char* name, int name_length);
WasmFunctionEncoder* Build(Zone* zone, WasmModuleBuilder* mb) const;
private:
explicit WasmFunctionBuilder(Zone* zone);
friend class WasmModuleBuilder;
LocalType return_type_;
struct Type;
ZoneVector<Type> locals_;
uint8_t exported_;
uint8_t external_;
ZoneVector<uint8_t> body_;
ZoneVector<uint32_t> local_indices_;
ZoneVector<char> name_;
uint16_t AddVar(LocalType type, bool param);
void IndexVars(WasmFunctionEncoder* e, uint16_t* var_index) const;
};
class WasmDataSegmentEncoder : public ZoneObject {
public:
WasmDataSegmentEncoder(Zone* zone, const byte* data, uint32_t size,
uint32_t dest);
uint32_t HeaderSize() const;
uint32_t BodySize() const;
void Serialize(byte* buffer, byte** header, byte** body) const;
private:
ZoneVector<byte> data_;
uint32_t dest_;
};
class WasmModuleIndex : public ZoneObject {
public:
const byte* Begin() const { return begin_; }
const byte* End() const { return end_; }
private:
friend class WasmModuleWriter;
WasmModuleIndex(const byte* begin, const byte* end)
: begin_(begin), end_(end) {}
const byte* begin_;
const byte* end_;
};
class WasmModuleWriter : public ZoneObject {
public:
WasmModuleIndex* WriteTo(Zone* zone) const;
private:
friend class WasmModuleBuilder;
explicit WasmModuleWriter(Zone* zone);
ZoneVector<WasmFunctionEncoder*> functions_;
ZoneVector<WasmDataSegmentEncoder*> data_segments_;
ZoneVector<FunctionSig*> signatures_;
ZoneVector<uint16_t> indirect_functions_;
ZoneVector<std::pair<MachineType, bool>> globals_;
};
class WasmModuleBuilder : public ZoneObject {
public:
explicit WasmModuleBuilder(Zone* zone);
uint16_t AddFunction();
uint32_t AddGlobal(MachineType type, bool exported);
WasmFunctionBuilder* FunctionAt(size_t index);
void AddDataSegment(WasmDataSegmentEncoder* data);
uint16_t AddSignature(FunctionSig* sig);
void AddIndirectFunction(uint16_t index);
WasmModuleWriter* Build(Zone* zone);
private:
struct CompareFunctionSigs {
int operator()(FunctionSig* a, FunctionSig* b) const;
};
typedef ZoneMap<FunctionSig*, uint16_t, CompareFunctionSigs> SignatureMap;
Zone* zone_;
ZoneVector<FunctionSig*> signatures_;
ZoneVector<WasmFunctionBuilder*> functions_;
ZoneVector<WasmDataSegmentEncoder*> data_segments_;
ZoneVector<uint16_t> indirect_functions_;
ZoneVector<std::pair<MachineType, bool>> globals_;
SignatureMap signature_map_;
};
std::vector<uint8_t> UnsignedLEB128From(uint32_t result);
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_ENCODER_H_
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