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_WASM_CONSTANTS_H_ 6 #define V8_WASM_WASM_CONSTANTS_H_ 7 8 #include <cstddef> 9 #include <cstdint> 10 11 namespace v8 { 12 namespace internal { 13 namespace wasm { 14 15 // Binary encoding of the module header. 16 constexpr uint32_t kWasmMagic = 0x6d736100; 17 constexpr uint32_t kWasmVersion = 0x01; 18 19 // Binary encoding of local types. 20 enum ValueTypeCode : uint8_t { 21 kLocalVoid = 0x40, 22 kLocalI32 = 0x7f, 23 kLocalI64 = 0x7e, 24 kLocalF32 = 0x7d, 25 kLocalF64 = 0x7c, 26 kLocalS128 = 0x7b, 27 kLocalAnyFunc = 0x70, 28 kLocalAnyRef = 0x6f 29 }; 30 // Binary encoding of other types. 31 constexpr uint8_t kWasmFunctionTypeCode = 0x60; 32 33 // Binary encoding of import/export kinds. 34 enum ImportExportKindCode : uint8_t { 35 kExternalFunction = 0, 36 kExternalTable = 1, 37 kExternalMemory = 2, 38 kExternalGlobal = 3 39 }; 40 41 // Binary encoding of maximum and shared flags for memories. 42 enum MaximumFlag : uint8_t { kNoMaximumFlag = 0, kHasMaximumFlag = 1 }; 43 44 enum MemoryFlags : uint8_t { 45 kNoMaximum = 0, 46 kMaximum = 1, 47 kSharedNoMaximum = 2, 48 kSharedAndMaximum = 3 49 }; 50 51 // Binary encoding of sections identifiers. 52 enum SectionCode : int8_t { 53 kUnknownSectionCode = 0, // code for unknown sections 54 kTypeSectionCode = 1, // Function signature declarations 55 kImportSectionCode = 2, // Import declarations 56 kFunctionSectionCode = 3, // Function declarations 57 kTableSectionCode = 4, // Indirect function table and other tables 58 kMemorySectionCode = 5, // Memory attributes 59 kGlobalSectionCode = 6, // Global declarations 60 kExportSectionCode = 7, // Exports 61 kStartSectionCode = 8, // Start function declaration 62 kElementSectionCode = 9, // Elements section 63 kCodeSectionCode = 10, // Function code 64 kDataSectionCode = 11, // Data segments 65 kNameSectionCode = 12, // Name section (encoded as a string) 66 kExceptionSectionCode = 13, // Exception section 67 68 // Helper values 69 kFirstSectionInModule = kTypeSectionCode, 70 kLastKnownModuleSection = kExceptionSectionCode, 71 }; 72 73 // Binary encoding of name section kinds. 74 enum NameSectionKindCode : uint8_t { kModule = 0, kFunction = 1, kLocal = 2 }; 75 76 constexpr size_t kWasmPageSize = 0x10000; 77 constexpr uint32_t kWasmPageSizeLog2 = 16; 78 constexpr int kInvalidExceptionTag = -1; 79 80 // TODO(wasm): Wrap WasmCodePosition in a struct. 81 using WasmCodePosition = int; 82 constexpr WasmCodePosition kNoCodePosition = -1; 83 84 } // namespace wasm 85 } // namespace internal 86 } // namespace v8 87 88 #endif // V8_WASM_WASM_CONSTANTS_H_ 89
