[wasm] Support undefined indirect table entries, behind a flag.

test/mjsunit/wasm/default-func-call.js

Index: test/mjsunit/wasm/default-func-call.js
diff --git a/test/mjsunit/wasm/indirect-calls.js b/test/mjsunit/wasm/default-func-call.js
similarity index 73%
copy from test/mjsunit/wasm/indirect-calls.js
copy to test/mjsunit/wasm/default-func-call.js
index 80bee412e028541e3b54ba7a175a512cb8293e77..608673c2929b614b375ecc67e864bad09d08494b 100644
--- a/test/mjsunit/wasm/indirect-calls.js
+++ b/test/mjsunit/wasm/default-func-call.js
@@ -1,8 +1,10 @@
 // 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
+// Flags: --wasm-jit-prototype
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
@@ -11,6 +13,7 @@ var module = (function () {
   var builder = new WasmModuleBuilder();
 
   var sig_index = builder.addSignature(kSig_i_ii);
+  builder.addPad(512);

[bradn, 2016/06/21 18:43:02]

But how about we make this:
addPadFunctionTable ?

   builder.addImport("add", sig_index);
   builder.addFunction("add", sig_index)
     .addBody([
@@ -46,4 +49,10 @@ assertEquals(5, module.exports.main(1, 12, 7));
 assertEquals(19, module.exports.main(0, 12, 7));
 
 assertTraps(kTrapFuncSigMismatch, "module.exports.main(2, 12, 33)");

[bradn, 2016/06/21 17:42:37]

Maybe make this just test the trapping directly?
I.e. make the wrapper function more direct?

[bradn, 2016/06/21 18:43:02]

Sorry confused with the test from yesterday.
This is fine.

-assertTraps(kTrapFuncInvalid, "module.exports.main(3, 12, 33)");
+assertTraps(kTrapFuncSigMismatch, "module.exports.main(3, 12, 33)");
+assertTraps(kTrapFuncSigMismatch, "module.exports.main(4, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(1023, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(1025, 12, 33)");
+assertTraps(kTrapFuncSigMismatch, "module.exports.main(511, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(513, 12, 33)");
+assertTraps(kTrapFuncInvalid, "module.exports.main(-1, 12, 33)");