[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) {
+  let sig_index = builder.addType(kSig_i_ii);
+  let mul = builder.addFunction("mul", sig_index)
+    .addBody([
+      kExprGetLocal, 0,  // --
+      kExprGetLocal, 1,  // --
+      kExprI32Mul        // --
+    ]);
+  let add = builder.addFunction("add", sig_index)
+    .addBody([
+      kExprGetLocal, 0,  // --
+      kExprGetLocal, 1,  // --
+      kExprI32Add        // --
+    ]);
+  let sub = builder.addFunction("sub", sig_index)
+    .addBody([
+      kExprGetLocal, 0,  // --
+      kExprGetLocal, 1,  // --
+      kExprI32Sub        // --
+    ]);
+  return {mul: mul, add: add, sub: sub};
+}
+
+(function ExportedTableTest() {
+  print("ExportedTableTest...");
+
+  let builder = new WasmModuleBuilder();
+
+  let d = builder.addImport("js_div", kSig_i_ii);
+  let f = AddFunctions(builder);
+  builder.addFunction("main", kSig_i_ii)
+    .addBody([
+      kExprI32Const, 33,  // --
+      kExprGetLocal, 0,   // --
+      kExprGetLocal, 1,   // --
+      kExprCallIndirect, 0])  // --
+    .exportAs("main");
+
+  f.add.exportAs("blarg");
+
+  builder.setFunctionTableLength(10);
+  let g = builder.addImportedGlobal("base", undefined, kAstI32);
+  builder.addFunctionTableInit(g, true, [f.mul.index, f.add.index,
+                                         f.sub.index,
+                                         d]);
+  builder.addExportOfKind("table", kExternalTable, 0);
+
+  let module = new WebAssembly.Module(builder.toBuffer());
+
+  function js_div(a, b) { return (a / b) | 0; }
+
+  for (let i = 0; i < 5; i++) {
+    print(" base = " + i);
+    let instance = new WebAssembly.Instance(module, {base: i, js_div: js_div});
+    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("blarg", add.name);
+
+    let exp_div = table.get(i+3);
+    assertEquals("function", typeof exp_div);
+    print("  js_div=" + exp_div);
+    // Should have a new, wrapped version of the import.
+    assertFalse(js_div == exp_div);
+
+
+    for (let j = i + 4; j < 10; j++) {
+      assertSame(null, table.get(j));
+    }
+
+    assertEquals(-33, mul(-11, 3));
+    assertEquals(4444444, add(3333333, 1111111));
+    assertEquals(-9999, sub(1, 10000));
+    assertEquals(-44, exp_div(-88.1, 2));
+  }
+})();