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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_CONSTANTS_H_
#define V8_WASM_CONSTANTS_H_
namespace v8 {
namespace internal {
namespace wasm {
// Binary encoding of the module header.
constexpr uint32_t kWasmMagic = 0x6d736100;
constexpr uint32_t kWasmVersion = 0x01;
// Binary encoding of local types.
enum ValueTypeCode : uint8_t {
kLocalVoid = 0x40,
kLocalI32 = 0x7f,
kLocalI64 = 0x7e,
kLocalF32 = 0x7d,
kLocalF64 = 0x7c,
kLocalS128 = 0x7b
};
// Binary encoding of other types.
constexpr uint8_t kWasmFunctionTypeCode = 0x60;
constexpr uint8_t kWasmAnyFunctionTypeCode = 0x70;
// Binary encoding of import/export kinds.
enum ImportExportKindCode : uint8_t {
kExternalFunction = 0,
kExternalTable = 1,
kExternalMemory = 2,
kExternalGlobal = 3
};
// Binary encoding of maximum and shared flags for memories.
enum MaximumFlag : uint8_t { kNoMaximumFlag = 0, kHasMaximumFlag = 1 };
enum MemoryFlags : uint8_t {
kNoMaximum = 0,
kMaximum = 1,
kSharedNoMaximum = 2,
kSharedAndMaximum = 3
};
// Binary encoding of sections identifiers.
enum SectionCode : int8_t {
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)
kExceptionSectionCode = 13, // Exception section
// Helper values
kFirstSectionInModule = kTypeSectionCode,
kLastKnownModuleSection = kExceptionSectionCode,
};
// Binary encoding of name section kinds.
enum NameSectionKindCode : uint8_t { kModule = 0, kFunction = 1, kLocal = 2 };
constexpr uint32_t kWasmPageSize = 0x10000;
constexpr int kInvalidExceptionTag = -1;
// TODO(wasm): Wrap WasmCodePosition in a struct.
using WasmCodePosition = int;
constexpr WasmCodePosition kNoCodePosition = -1;
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_CONSTANTS_H_
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