1 files changed, 87 insertions, 0 deletions
diff --git a/include/llvm/Support/Wasm.h b/include/llvm/Support/Wasm.h
new file mode 100644
index 0000000000000..8ac6b9038e913
--- /dev/null
+++ b/include/llvm/Support/Wasm.h
@@ -0,0 +1,87 @@
+//===- 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_SUPPORT_WASM_H
+#define LLVM_SUPPORT_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 = 0xd;
+
+struct WasmObjectHeader {
+  StringRef Magic;
+  uint32_t Version;
+};
+
+struct WasmSection {
+  uint32_t Type;             // Section type (See below)
+  uint32_t Offset;           // Offset with in the file
+  StringRef Name;            // Section name (User-defined sections only)
+  ArrayRef<uint8_t> Content; // Section content
+};
+
+enum : unsigned {
+  WASM_SEC_USER = 0,     // 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 : unsigned {
+  WASM_TYPE_I32          = 0x7f,
+  WASM_TYPE_I64          = 0x7e,
+  WASM_TYPE_F32          = 0x7d,
+  WASM_TYPE_F64          = 0x7c,
+  WASM_TYPE_ANYFUNC      = 0x70,
+  WASM_TYPE_FUNC         = 0x60,
+  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,
+};
+
+} // end namespace wasm
+} // end namespace llvm
+
+#endif