[wasm] Add support for exporting WebAssembly.Table instances.

test/mjsunit/wasm/indirect-tables.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");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+function AddFunctions(builder) {
+  var mul = builder.addFunction("mul", kSig_i_ii)
+    .addBody([
+      kExprGetLocal, 0,  // --
+      kExprGetLocal, 1,  // --
+      kExprI32Mul        // --
+    ]);
+  var add = builder.addFunction("add", kSig_i_ii)
+    .addBody([
+      kExprGetLocal, 0,  // --
+      kExprGetLocal, 1,  // --
+      kExprI32Add        // --
+    ]);
+  var sub = builder.addFunction("sub", kSig_i_ii)
+    .addBody([
+      kExprGetLocal, 0,  // --
+      kExprGetLocal, 1,  // --
+      kExprI32Sub        // --
+    ]);
+  return {mul: mul, add: add, sub: sub};
+}
+
+(function ExportedTableTest() {
+  print("ExportedTableTest...");
+
+  let builder = new WasmModuleBuilder();
+
+  let f = AddFunctions(builder);
+  builder.addFunction("main", kSig_i_ii)
+    .addBody([
+      kExprI32Const, 33,  // --
+      kExprGetLocal, 0,   // --
+      kExprGetLocal, 1,   // --
+      kExprCallIndirect, 0])  // --
+    .exportAs("main");
+
+  f.add.exportAs("add");
+
+  builder.setFunctionTableLength(10);
+  let g = builder.addImportedGlobal("base", undefined, kAstI32);
+  builder.addFunctionTableInit(g, true, [f.mul.index, f.add.index, f.sub.index]);

[titzer, 2016/10/25 08:27:37]

Done.

+  builder.addExportOfKind("table", kExternalTable, 0);
+
+  let module = new WebAssembly.Module(builder.toBuffer());

[bradnelson, 2016/10/25 07:33:39]

What about a case for imports into a different module?

[titzer, 2016/10/25 08:27:37]

Add a case for adding an imported function to the indirect table.

I plan to add more tests when I implement importing of tables.

+
+  for (let i = 0; i < 5; i++) {
+    print(" base = " + i);
+    let instance = new WebAssembly.Instance(module, {base: i});
+    main = instance.exports.main;
+    let table = instance.exports.table;
+    assertTrue(table instanceof WebAssembly.Table);
+    assertEquals(10, table.length);
+    for (let j = 0; j < i; j++) {
+      assertSame(null, table.get(j));
+    }
+    let mul = table.get(i+0);
+    let add = table.get(i+1);
+    let sub = table.get(i+2);
+
+    print("  mul=" + mul);
+    print("  add=" + add);
+    print("  sub=" + sub);
+    assertEquals("function", typeof mul);
+    assertEquals("function", typeof add);
+    assertEquals("function", typeof sub);
+    assertEquals(2, mul.length);
+    assertEquals(2, add.length);
+    assertEquals(2, sub.length);
+
+    assertEquals("add", add.name);

[bradnelson, 2016/10/25 07:33:39]

Do we maybe want to have export names that don't match the names?
i.e. we could be getting the wrong field and not notice?

[titzer, 2016/10/25 08:27:37]

Done.

+
+    for (let j = i + 3; j < 10; j++) {
+      assertSame(null, table.get(j));
+    }
+
+    assertEquals(-33, mul(-11, 3));
+    assertEquals(4444444, add(3333333, 1111111));
+    assertEquals(-9999, sub(1, 10000));
+  }
+})();