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88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
//===- Wasm.h - Wasm object file format -------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines manifest constants for the wasm object file format.
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// See: https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_WASM_H
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#define LLVM_SUPPORT_WASM_H
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#include "llvm/ADT/ArrayRef.h"
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namespace llvm {
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namespace wasm {
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// Object file magic string.
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const char WasmMagic[] = {'\0', 'a', 's', 'm'};
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// Wasm binary format version
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const uint32_t WasmVersion = 0xd;
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struct WasmObjectHeader {
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StringRef Magic;
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uint32_t Version;
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};
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struct WasmSection {
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uint32_t Type; // Section type (See below)
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uint32_t Offset; // Offset with in the file
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StringRef Name; // Section name (User-defined sections only)
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ArrayRef<uint8_t> Content; // Section content
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};
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enum : unsigned {
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WASM_SEC_USER = 0, // User-defined section
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WASM_SEC_TYPE = 1, // Function signature declarations
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WASM_SEC_IMPORT = 2, // Import declarations
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WASM_SEC_FUNCTION = 3, // Function declarations
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WASM_SEC_TABLE = 4, // Indirect function table and other tables
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WASM_SEC_MEMORY = 5, // Memory attributes
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WASM_SEC_GLOBAL = 6, // Global declarations
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WASM_SEC_EXPORT = 7, // Exports
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WASM_SEC_START = 8, // Start function declaration
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WASM_SEC_ELEM = 9, // Elements section
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WASM_SEC_CODE = 10, // Function bodies (code)
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WASM_SEC_DATA = 11 // Data segments
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};
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// Type immediate encodings used in various contexts.
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enum : unsigned {
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WASM_TYPE_I32 = 0x7f,
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WASM_TYPE_I64 = 0x7e,
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WASM_TYPE_F32 = 0x7d,
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WASM_TYPE_F64 = 0x7c,
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WASM_TYPE_ANYFUNC = 0x70,
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WASM_TYPE_FUNC = 0x60,
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WASM_TYPE_NORESULT = 0x40, // for blocks with no result values
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};
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// Kinds of externals (for imports and exports).
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enum : unsigned {
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WASM_EXTERNAL_FUNCTION = 0x0,
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WASM_EXTERNAL_TABLE = 0x1,
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WASM_EXTERNAL_MEMORY = 0x2,
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WASM_EXTERNAL_GLOBAL = 0x3,
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};
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// Opcodes used in initializer expressions.
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enum : unsigned {
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WASM_OPCODE_END = 0x0b,
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WASM_OPCODE_GET_GLOBAL = 0x23,
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WASM_OPCODE_I32_CONST = 0x41,
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WASM_OPCODE_I64_CONST = 0x42,
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WASM_OPCODE_F32_CONST = 0x43,
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WASM_OPCODE_F64_CONST = 0x44,
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};
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} // end namespace wasm
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} // end namespace llvm
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#endif
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