| // 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_MODULE_DECODER_H_ |
| #define V8_WASM_MODULE_DECODER_H_ |
| |
| #include "src/globals.h" |
| #include "src/wasm/function-body-decoder.h" |
| #include "src/wasm/wasm-module.h" |
| #include "src/wasm/wasm-result.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace wasm { |
| |
| const uint32_t kWasmMagic = 0x6d736100; |
| const uint32_t kWasmVersion = 0x01; |
| const uint8_t kWasmFunctionTypeForm = 0x60; |
| const uint8_t kWasmAnyFunctionTypeForm = 0x70; |
| const uint8_t kResizableMaximumFlag = 1; |
| |
| enum WasmSectionCode { |
| kUnknownSectionCode = 0, // code for unknown sections |
| kTypeSectionCode = 1, // Function signature declarations |
| kImportSectionCode = 2, // Import declarations |
| kFunctionSectionCode = 3, // Function declarations |
| kTableSectionCode = 4, // Indirect function table and other tables |
| kMemorySectionCode = 5, // Memory attributes |
| kGlobalSectionCode = 6, // Global declarations |
| kExportSectionCode = 7, // Exports |
| kStartSectionCode = 8, // Start function declaration |
| kElementSectionCode = 9, // Elements section |
| kCodeSectionCode = 10, // Function code |
| kDataSectionCode = 11, // Data segments |
| kNameSectionCode = 12, // Name section (encoded as a string) |
| }; |
| |
| inline bool IsValidSectionCode(uint8_t byte) { |
| return kTypeSectionCode <= byte && byte <= kDataSectionCode; |
| } |
| |
| const char* SectionName(WasmSectionCode code); |
| |
| typedef Result<const WasmModule*> ModuleResult; |
| typedef Result<WasmFunction*> FunctionResult; |
| typedef std::vector<std::pair<int, int>> FunctionOffsets; |
| typedef Result<FunctionOffsets> FunctionOffsetsResult; |
| struct AsmJsOffsetEntry { |
| int byte_offset; |
| int source_position_call; |
| int source_position_number_conversion; |
| }; |
| typedef std::vector<std::vector<AsmJsOffsetEntry>> AsmJsOffsets; |
| typedef Result<AsmJsOffsets> AsmJsOffsetsResult; |
| |
| // Decodes the bytes of a WASM module between {module_start} and {module_end}. |
| V8_EXPORT_PRIVATE ModuleResult DecodeWasmModule(Isolate* isolate, |
| const byte* module_start, |
| const byte* module_end, |
| bool verify_functions, |
| ModuleOrigin origin); |
| |
| // Exposed for testing. Decodes a single function signature, allocating it |
| // in the given zone. Returns {nullptr} upon failure. |
| V8_EXPORT_PRIVATE FunctionSig* DecodeWasmSignatureForTesting(Zone* zone, |
| const byte* start, |
| const byte* end); |
| |
| // Decodes the bytes of a WASM function between |
| // {function_start} and {function_end}. |
| V8_EXPORT_PRIVATE FunctionResult DecodeWasmFunction(Isolate* isolate, |
| Zone* zone, |
| ModuleBytesEnv* env, |
| const byte* function_start, |
| const byte* function_end); |
| |
| // Extracts the function offset table from the wasm module bytes. |
| // Returns a vector with <offset, length> entries, or failure if the wasm bytes |
| // are detected as invalid. Note that this validation is not complete. |
| FunctionOffsetsResult DecodeWasmFunctionOffsets(const byte* module_start, |
| const byte* module_end); |
| |
| V8_EXPORT_PRIVATE WasmInitExpr DecodeWasmInitExprForTesting(const byte* start, |
| const byte* end); |
| |
| struct CustomSectionOffset { |
| uint32_t section_start; |
| uint32_t name_offset; |
| uint32_t name_length; |
| uint32_t payload_offset; |
| uint32_t payload_length; |
| uint32_t section_length; |
| }; |
| |
| V8_EXPORT_PRIVATE std::vector<CustomSectionOffset> DecodeCustomSections( |
| const byte* start, const byte* end); |
| |
| // Extracts the mapping from wasm byte offset to asm.js source position per |
| // function. |
| // Returns a vector of vectors with <byte_offset, source_position> entries, or |
| // failure if the wasm bytes are detected as invalid. Note that this validation |
| // is not complete. |
| AsmJsOffsetsResult DecodeAsmJsOffsets(const byte* module_start, |
| const byte* module_end); |
| |
| } // namespace wasm |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_WASM_MODULE_DECODER_H_ |