[inspector] Add test case for wasm source

test/inspector/debugger/wasm-source.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');
+
+var builder = new WasmModuleBuilder();
+
+var imported_idx = builder.addImport("func", kSig_v_v);
+
+var call_imported_idx = builder.addFunction("call_func", kSig_v_v)
+    .addBody([kExprCallFunction, imported_idx])
+    .index;
+
+var sig_index = builder.addType(kSig_v_v);
+
+builder.addFunction('main', kSig_v_v)
+    .addBody([
+      kExprBlock, kAstStmt, kExprI32Const, 0, kExprCallIndirect, sig_index,
+      kTableZero, kExprEnd
+    ])
+    .exportAs('main');
+
+builder.appendToTable([call_imported_idx]);
+
+var module_bytes = builder.toArray();
+
+function testFunction(bytes) {
+  function call_debugger() {
+    debugger;
+  }
+
+  var buffer = new ArrayBuffer(bytes.length);
+  var view = new Uint8Array(buffer);
+  for (var i = 0; i < bytes.length; i++) {
+    view[i] = bytes[i] | 0;
+  }
+
+  var module = new WebAssembly.Module(buffer);
+  var instance = new WebAssembly.Instance(module, {func: call_debugger});
+
+  instance.exports.main();
+}
+
+InspectorTest.addScript(testFunction.toString());
+InspectorTest.addScript('var module_bytes = ' + JSON.stringify(module_bytes));
+
+Protocol.Debugger.enable();
+Protocol.Debugger.onPaused(handleDebuggerPaused);
+InspectorTest.log('Check that inspector gets disassembled wasm code');
+Protocol.Runtime.evaluate({'expression': 'testFunction(module_bytes)'});
+
+function handleDebuggerPaused(messageObject)
+{
+  InspectorTest.log('Paused on debugger!');
+  var frames = messageObject.params.callFrames;
+  InspectorTest.log('Number of frames: ' + frames.length);
+  function next(frame_id) {
+    if (frame_id == frames.length) {
+      InspectorTest.log('Finished.');
+      InspectorTest.completeTest();
+    }
+    Protocol.Debugger
+        .getScriptSource({scriptId: frames[frame_id].location.scriptId})
+        .then((sourceMessage) => {

[kozy, 2016/11/15 23:10:53]

Please extract this arrow function to real one, we prefer not to use arrow
function with more then one line.

And maybe we can rewrite this in following pattern:

next(0).then(() => InspectorTest.completeTest());
function next(id) {
if (id === frames.length) return Promise.resolve();
return Protocol.Debugger.getScriptSource(..)
  .then(dumpSource)
  .then(() => next(id + 1));
}

[Clemens Hammacher, 2016/11/16 11:58:01]

Thanks, that looks much nicer indeed. I have to work on my
Promise-based-programming skills ;)

+          if (sourceMessage.error)
+            InspectorTest.logObject(sourceMessage);
+          var text = sourceMessage.result.scriptSource;
+          var line_nr = frames[frame_id].location.lineNumber;
+          var line = text.split('\n')[line_nr];
+          InspectorTest.log('[' + frame_id + '] ' + line);
+          next(frame_id + 1);
+        });
+  }
+  next(0);
+}