Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_WASM_ENCODER_H_ |
| 6 | #define V8_WASM_ENCODER_H_ |
| 7 | |
| 8 | #include "src/signature.h" |
| 9 | #include "src/zone-containers.h" |
| 10 | |
| 11 | #include "src/base/smart-pointers.h" |
| 12 | |
| 13 | #include "src/wasm/wasm-module.h" |
| 14 | #include "src/wasm/wasm-opcodes.h" |
| 15 | #include "src/wasm/wasm-result.h" |
| 16 | |
| 17 | namespace v8 { |
| 18 | namespace internal { |
| 19 | namespace wasm { |
| 20 | |
| 21 | class WasmModuleBuilder; |
| 22 | |
| 23 | class WasmFunctionEncoder : public ZoneObject { |
| 24 | public: |
| 25 | uint32_t HeaderSize() const; |
| 26 | uint32_t BodySize() const; |
| 27 | uint32_t NameSize() const; |
| 28 | void Serialize(byte* buffer, byte** header, byte** body) const; |
| 29 | |
| 30 | private: |
| 31 | WasmFunctionEncoder(Zone* zone, LocalType return_type, bool exported, |
| 32 | bool external); |
| 33 | friend class WasmFunctionBuilder; |
| 34 | uint16_t signature_index_; |
| 35 | ZoneVector<LocalType> params_; |
| 36 | uint16_t local_int32_count_; |
| 37 | uint16_t local_int64_count_; |
| 38 | uint16_t local_float32_count_; |
| 39 | uint16_t local_float64_count_; |
| 40 | bool exported_; |
| 41 | bool external_; |
| 42 | ZoneVector<uint8_t> body_; |
| 43 | ZoneVector<char> name_; |
| 44 | |
| 45 | bool HasLocals() const { |
| 46 | return (local_int32_count_ + local_int64_count_ + local_float32_count_ + |
| 47 | local_float64_count_) > 0; |
| 48 | } |
| 49 | |
| 50 | bool HasName() const { return exported_ && name_.size() > 0; } |
| 51 | }; |
| 52 | |
| 53 | class WasmFunctionBuilder : public ZoneObject { |
| 54 | public: |
| 55 | uint16_t AddParam(LocalType type); |
| 56 | uint16_t AddLocal(LocalType type); |
| 57 | void ReturnType(LocalType type); |
| 58 | void EmitCode(const byte* code, uint32_t code_size); |
| 59 | void EmitCode(const byte* code, uint32_t code_size, |
| 60 | const uint32_t* local_indices, uint32_t indices_size); |
| 61 | void Emit(WasmOpcode opcode); |
| 62 | void EmitWithU8(WasmOpcode opcode, const byte immediate); |
| 63 | void EmitWithLocal(WasmOpcode opcode); |
| 64 | uint32_t EmitEditableImmediate(const byte immediate); |
| 65 | void EditImmediate(uint32_t offset, const byte immediate); |
| 66 | void Exported(uint8_t flag); |
| 67 | void External(uint8_t flag); |
| 68 | void SetName(const unsigned char* name, int name_length); |
| 69 | WasmFunctionEncoder* Build(Zone* zone, WasmModuleBuilder* mb) const; |
| 70 | |
| 71 | private: |
| 72 | explicit WasmFunctionBuilder(Zone* zone); |
| 73 | friend class WasmModuleBuilder; |
| 74 | LocalType return_type_; |
| 75 | struct Type; |
| 76 | ZoneVector<Type> locals_; |
| 77 | uint8_t exported_; |
| 78 | uint8_t external_; |
| 79 | ZoneVector<uint8_t> body_; |
| 80 | ZoneVector<uint32_t> local_indices_; |
| 81 | ZoneVector<char> name_; |
| 82 | uint16_t AddVar(LocalType type, bool param); |
| 83 | void IndexVars(WasmFunctionEncoder* e, uint16_t* var_index) const; |
| 84 | }; |
| 85 | |
| 86 | class WasmDataSegmentEncoder : public ZoneObject { |
| 87 | public: |
| 88 | WasmDataSegmentEncoder(Zone* zone, const byte* data, uint32_t size, |
| 89 | uint32_t dest); |
| 90 | uint32_t HeaderSize() const; |
| 91 | uint32_t BodySize() const; |
| 92 | void Serialize(byte* buffer, byte** header, byte** body) const; |
| 93 | |
| 94 | private: |
| 95 | ZoneVector<byte> data_; |
| 96 | uint32_t dest_; |
| 97 | }; |
| 98 | |
| 99 | class WasmModuleIndex : public ZoneObject { |
| 100 | public: |
| 101 | const byte* Begin() const { return begin_; } |
| 102 | const byte* End() const { return end_; } |
| 103 | |
| 104 | private: |
| 105 | friend class WasmModuleWriter; |
| 106 | WasmModuleIndex(const byte* begin, const byte* end) |
| 107 | : begin_(begin), end_(end) {} |
| 108 | const byte* begin_; |
| 109 | const byte* end_; |
| 110 | }; |
| 111 | |
| 112 | class WasmModuleWriter : public ZoneObject { |
| 113 | public: |
| 114 | WasmModuleIndex* WriteTo(Zone* zone) const; |
| 115 | |
| 116 | private: |
| 117 | friend class WasmModuleBuilder; |
| 118 | explicit WasmModuleWriter(Zone* zone); |
| 119 | ZoneVector<WasmFunctionEncoder*> functions_; |
| 120 | ZoneVector<WasmDataSegmentEncoder*> data_segments_; |
| 121 | ZoneVector<FunctionSig*> signatures_; |
| 122 | ZoneVector<uint16_t> indirect_functions_; |
| 123 | ZoneVector<std::pair<MachineType, bool>> globals_; |
| 124 | }; |
| 125 | |
| 126 | class WasmModuleBuilder : public ZoneObject { |
| 127 | public: |
| 128 | explicit WasmModuleBuilder(Zone* zone); |
| 129 | uint16_t AddFunction(); |
| 130 | uint32_t AddGlobal(MachineType type, bool exported); |
| 131 | WasmFunctionBuilder* FunctionAt(size_t index); |
| 132 | void AddDataSegment(WasmDataSegmentEncoder* data); |
| 133 | uint16_t AddSignature(FunctionSig* sig); |
| 134 | void AddIndirectFunction(uint16_t index); |
| 135 | WasmModuleWriter* Build(Zone* zone); |
| 136 | |
| 137 | private: |
| 138 | struct CompareFunctionSigs { |
| 139 | int operator()(FunctionSig* a, FunctionSig* b) const; |
| 140 | }; |
| 141 | typedef ZoneMap<FunctionSig*, uint16_t, CompareFunctionSigs> SignatureMap; |
| 142 | |
| 143 | Zone* zone_; |
| 144 | ZoneVector<FunctionSig*> signatures_; |
| 145 | ZoneVector<WasmFunctionBuilder*> functions_; |
| 146 | ZoneVector<WasmDataSegmentEncoder*> data_segments_; |
| 147 | ZoneVector<uint16_t> indirect_functions_; |
| 148 | ZoneVector<std::pair<MachineType, bool>> globals_; |
| 149 | SignatureMap signature_map_; |
| 150 | }; |
| 151 | |
| 152 | std::vector<uint8_t> UnsignedLEB128From(uint32_t result); |
| 153 | } // namespace wasm |
| 154 | } // namespace internal |
| 155 | } // namespace v8 |
| 156 | |
| 157 | #endif // V8_WASM_ENCODER_H_ |