[wasm] Add an export table.

test/mjsunit/wasm/export-table.js

+// Copyright 2016 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");
+
+(function testExportedMain() {
+  var kBodySize = 3;
+  var kReturnValue = 99;
+  var kNameMainOffset = 4 + 7 + kBodySize + 8 + 1;
+
+  var data = bytes(
+    // signatures
+    kDeclSignatures, 1,
+    0, kAstI32,                  // void -> i32
+    // -- main function
+    kDeclFunctions,
+    1,
+    0,                           // decl flags
+    0, 0,                        // signature index
+    kBodySize, 0,
+    // main body
+    kExprReturn,
+    kExprI8Const,
+    kReturnValue,
+    // exports
+    kDeclExportTable,
+    1,
+    0, 0,                       // func index index
+    kNameMainOffset, 0, 0, 0,   // function name offset
+    // names
+    kDeclEnd,
+    'm', 'a', 'i', 'n', 0       // --
+  );
+
+  var ffi = new Object();
+  var module = _WASMEXP_.instantiateModule(data, ffi);
+
+  assertEquals("object", typeof module.exports);
+  assertEquals("function", typeof module.exports.main);
+
+  assertEquals(kReturnValue, module.exports.main());
+})();
+
+(function testExportedTwice() {
+  var kBodySize = 3;
+  var kReturnValue = 99;
+  var kNameMainOffset = 4 + 7 + kBodySize + 14 + 1;
+  var kNameFooOffset = kNameMainOffset + 5;
+
+  var data = bytes(
+    // signatures
+    kDeclSignatures, 1,
+    0, kAstI32,                  // void -> i32
+    // -- main function
+    kDeclFunctions,
+    1,
+    0,                           // decl flags
+    0, 0,                        // signature index
+    kBodySize, 0,
+    // main body
+    kExprReturn,
+    kExprI8Const,
+    kReturnValue,
+    // exports
+    kDeclExportTable,
+    2,
+    0, 0,                       // func index index
+    kNameMainOffset, 0, 0, 0,   // function name offset
+    0, 0,                       // func index index
+    kNameFooOffset, 0, 0, 0,    // function name offset
+    // names
+    kDeclEnd,
+    'b', 'l', 'a', 'h', 0,       // --
+    'f', 'o', 'o', 0             // --
+  );
+
+  var ffi = new Object();
+  var module = _WASMEXP_.instantiateModule(data, ffi);
+
+  assertEquals("object", typeof module.exports);
+  assertEquals("function", typeof module.exports.blah);
+  assertEquals("function", typeof module.exports.foo);
+
+  assertEquals(kReturnValue, module.exports.blah());
+  assertEquals(kReturnValue, module.exports.foo());
+})();