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//===- Wasm.h - Wasm object file format -------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines manifest constants for the wasm object file format.
// See: https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_BINARYFORMAT_WASM_H
#define LLVM_BINARYFORMAT_WASM_H
#include "llvm/ADT/ArrayRef.h"
namespace llvm {
namespace wasm {
// Object file magic string.
const char WasmMagic[] = {'\0', 'a', 's', 'm'};
// Wasm binary format version
const uint32_t WasmVersion = 0x1;
// Wasm uses a 64k page size
const uint32_t WasmPageSize = 65536;
struct WasmObjectHeader {
StringRef Magic;
uint32_t Version;
};
struct WasmSignature {
std::vector<int32_t> ParamTypes;
int32_t ReturnType;
};
struct WasmExport {
StringRef Name;
uint32_t Kind;
uint32_t Index;
};
struct WasmLimits {
uint32_t Flags;
uint32_t Initial;
uint32_t Maximum;
};
struct WasmTable {
int32_t ElemType;
WasmLimits Limits;
};
struct WasmInitExpr {
uint8_t Opcode;
union {
int32_t Int32;
int64_t Int64;
int32_t Float32;
int64_t Float64;
uint32_t Global;
} Value;
};
struct WasmGlobal {
int32_t Type;
bool Mutable;
WasmInitExpr InitExpr;
};
struct WasmImport {
StringRef Module;
StringRef Field;
uint32_t Kind;
union {
uint32_t SigIndex;
WasmGlobal Global;
WasmTable Table;
WasmLimits Memory;
};
};
struct WasmLocalDecl {
int32_t Type;
uint32_t Count;
};
struct WasmFunction {
std::vector<WasmLocalDecl> Locals;
ArrayRef<uint8_t> Body;
};
struct WasmDataSegment {
uint32_t Index;
WasmInitExpr Offset;
ArrayRef<uint8_t> Content;
};
struct WasmElemSegment {
uint32_t TableIndex;
WasmInitExpr Offset;
std::vector<uint32_t> Functions;
};
struct WasmRelocation {
uint32_t Type; // The type of the relocation.
int32_t Index; // Index into function to global index space.
uint64_t Offset; // Offset from the start of the section.
int64_t Addend; // A value to add to the symbol.
};
enum : unsigned {
WASM_SEC_CUSTOM = 0, // Custom / User-defined section
WASM_SEC_TYPE = 1, // Function signature declarations
WASM_SEC_IMPORT = 2, // Import declarations
WASM_SEC_FUNCTION = 3, // Function declarations
WASM_SEC_TABLE = 4, // Indirect function table and other tables
WASM_SEC_MEMORY = 5, // Memory attributes
WASM_SEC_GLOBAL = 6, // Global declarations
WASM_SEC_EXPORT = 7, // Exports
WASM_SEC_START = 8, // Start function declaration
WASM_SEC_ELEM = 9, // Elements section
WASM_SEC_CODE = 10, // Function bodies (code)
WASM_SEC_DATA = 11 // Data segments
};
// Type immediate encodings used in various contexts.
enum {
WASM_TYPE_I32 = -0x01,
WASM_TYPE_I64 = -0x02,
WASM_TYPE_F32 = -0x03,
WASM_TYPE_F64 = -0x04,
WASM_TYPE_ANYFUNC = -0x10,
WASM_TYPE_FUNC = -0x20,
WASM_TYPE_NORESULT = -0x40, // for blocks with no result values
};
// Kinds of externals (for imports and exports).
enum : unsigned {
WASM_EXTERNAL_FUNCTION = 0x0,
WASM_EXTERNAL_TABLE = 0x1,
WASM_EXTERNAL_MEMORY = 0x2,
WASM_EXTERNAL_GLOBAL = 0x3,
};
// Opcodes used in initializer expressions.
enum : unsigned {
WASM_OPCODE_END = 0x0b,
WASM_OPCODE_GET_GLOBAL = 0x23,
WASM_OPCODE_I32_CONST = 0x41,
WASM_OPCODE_I64_CONST = 0x42,
WASM_OPCODE_F32_CONST = 0x43,
WASM_OPCODE_F64_CONST = 0x44,
};
enum : unsigned {
WASM_NAMES_FUNCTION = 0x1,
WASM_NAMES_LOCAL = 0x2,
};
enum : unsigned {
WASM_LIMITS_FLAG_HAS_MAX = 0x1,
};
// Subset of types that a value can have
enum class ValType {
I32 = WASM_TYPE_I32,
I64 = WASM_TYPE_I64,
F32 = WASM_TYPE_F32,
F64 = WASM_TYPE_F64,
};
// Linking metadata kinds.
enum : unsigned {
WASM_STACK_POINTER = 0x1,
WASM_SYMBOL_INFO = 0x2,
};
enum : unsigned {
WASM_SYMBOL_FLAG_WEAK = 0x1,
};
#define WASM_RELOC(name, value) name = value,
enum : unsigned {
#include "WasmRelocs/WebAssembly.def"
};
#undef WASM_RELOC
struct Global {
ValType Type;
bool Mutable;
// The initial value for this global is either the value of an imported
// global, in which case InitialModule and InitialName specify the global
// import, or a value, in which case InitialModule is empty and InitialValue
// holds the value.
StringRef InitialModule;
StringRef InitialName;
uint64_t InitialValue;
};
} // end namespace wasm
} // end namespace llvm
#endif
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