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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_WASM_CONSTANTS_H_
#define V8_WASM_WASM_CONSTANTS_H_
#include <cstddef>
#include <cstdint>
#include "src/common/globals.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,
kLocalAnyFunc = 0x70,
kLocalAnyRef = 0x6f,
kLocalExceptRef = 0x68,
};
// Binary encoding of other types.
constexpr uint8_t kWasmFunctionTypeCode = 0x60;
// Binary encoding of import/export kinds.
enum ImportExportKindCode : uint8_t {
kExternalFunction = 0,
kExternalTable = 1,
kExternalMemory = 2,
kExternalGlobal = 3,
kExternalException = 4
};
// 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
};
// Flags for data and element segments.
enum SegmentFlags : uint8_t {
kActiveNoIndex = 0, // Active segment with a memory/table index of zero.
kPassive = 1, // Passive segment.
kActiveWithIndex = 2, // Active segment with a given memory/table index.
};
// 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 others
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
kDataCountSectionCode = 12, // Number of data segments
kExceptionSectionCode = 13, // Exception section
// The following sections are custom sections, and are identified using a
// string rather than an integer. Their enumeration values are not guaranteed
// to be consistent.
kNameSectionCode, // Name section (encoded as a string)
kSourceMappingURLSectionCode, // Source Map URL section
kCompilationHintsSectionCode, // Compilation hints section
// Helper values
kFirstSectionInModule = kTypeSectionCode,
kLastKnownModuleSection = kCompilationHintsSectionCode,
kFirstUnorderedSection = kDataCountSectionCode,
};
// Binary encoding of compilation hints.
constexpr uint8_t kDefaultCompilationHint = 0x0;
constexpr uint8_t kNoCompilationHint = kMaxUInt8;
// Binary encoding of name section kinds.
enum NameSectionKindCode : uint8_t { kModule = 0, kFunction = 1, kLocal = 2 };
constexpr size_t kWasmPageSize = 0x10000;
constexpr uint32_t kWasmPageSizeLog2 = 16;
static_assert(kWasmPageSize == size_t{1} << kWasmPageSizeLog2, "consistency");
// TODO(wasm): Wrap WasmCodePosition in a struct.
using WasmCodePosition = int;
constexpr WasmCodePosition kNoCodePosition = -1;
constexpr uint32_t kExceptionAttribute = 0;
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_WASM_CONSTANTS_H_