[wasm] Add a magic word and a version number to the binary.

test/mjsunit/wasm/calls.js

 // 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.
 
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 
 var module = (function () {
   var kBodySize = 5;
-  var kNameOffset = 21 + kBodySize + 1;
+  var kNameOffset = kHeaderSize + 21 + kBodySize + 1;
 
-  return _WASMEXP_.instantiateModule(bytes(
+  return _WASMEXP_.instantiateModule(bytesWithHeader(
     // -- memory
     kDeclMemory,
     12, 12, 1,
     // -- signatures
     kDeclSignatures, 1,
     2, kAstI32, kAstI32, kAstI32, // int, int -> int
     // -- functions
     kDeclFunctions, 1,
     kDeclFunctionName | kDeclFunctionExport,
     0, 0,
@@ skipping 31 matching lines @@
 // Check the properties of the sub function.
 assertEquals("function", typeof module.sub);
 
 assertEquals(-55, module.sub(33, 88));
 assertEquals(-55555, module.sub(33333, 88888));
 assertEquals(-5555555, module.sub(3333333, 8888888));
 
 
 var module = (function() {
   var kBodySize = 1;
-  var kNameOffset2 = 19 + kBodySize + 1;
+  var kNameOffset2 = kHeaderSize + 19 + kBodySize + 1;
 
-  return _WASMEXP_.instantiateModule(bytes(
+  return _WASMEXP_.instantiateModule(bytesWithHeader(
     // -- memory
     kDeclMemory,
     12, 12, 1,
     // -- signatures
     kDeclSignatures, 1,
     0, kAstStmt,                // signature: void -> void
     // -- functions
     kDeclFunctions, 1,
     kDeclFunctionName | kDeclFunctionExport,
     0, 0,                       // signature index
@@ skipping 28 matching lines @@
 // Check the properties of the sub function.
 assertFalse(module.nop === undefined);
 assertFalse(module.nop === null);
 assertFalse(module.nop === 0);
 assertEquals("function", typeof module.nop);
 
 assertEquals(undefined, module.nop());
 
 (function testLt() {
   var kBodySize = 5;
-  var kNameOffset = 21 + kBodySize + 1;
+  var kNameOffset = kHeaderSize + 21 + kBodySize + 1;
 
-  var data = bytes(
+  var data = bytesWithHeader(
     // -- memory
     kDeclMemory,
     12, 12, 1,
     // -- signatures
     kDeclSignatures, 1,
     2, kAstI32, kAstF64, kAstF64, // (f64,f64)->int
     // -- functions
     kDeclFunctions, 1,
     kDeclFunctionName | kDeclFunctionExport,
     0, 0,                         // signature index
     kNameOffset, 0, 0, 0,         // name offset
     kBodySize, 0,
     // -- body
     kExprF64Lt,                   // --
     kExprGetLocal, 0,             // --
     kExprGetLocal, 1,             // --
     kDeclEnd,
     'f', 'l', 't', 0              // name
   );
 
   var module = _WASMEXP_.instantiateModule(data);
 
   assertEquals("function", typeof module.flt);
   assertEquals(1, module.flt(-2, -1));
   assertEquals(0, module.flt(7.3, 7.1));
   assertEquals(1, module.flt(7.1, 7.3));
 })();