[debug-wrapper] migrate debug-backtrace from DCP.

R=jgruber@chromium.org
BUG=v8:5530

Review-Url: https://codereview.chromium.org/2516343003
Cr-Commit-Position: refs/heads/master@{#41149}

test/debugger/debug/debug-backtrace.js

+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// The functions used for testing backtraces. They are at the top to make the
+// testing of source line/column easier.
+function f(x, y) {
+  a=1;
+};
+
+var m = (0, function() {
+  new f(1);
+});
+
+function g() {
+  m();
+};
+
+
+// Get the Debug object exposed from the debug context global object.
+Debug = debug.Debug
+
+listenerCalled = false;
+exception = false;
+
+function listener(event, exec_state, event_data, data) {
+  try {
+    if (event == Debug.DebugEvent.Break) {
+      // The expected backtrace is
+      // 0: f
+      // 1: m
+      // 2: g
+      // 3: [anonymous]
+      assertEquals(4, exec_state.frameCount());
+
+      var frame0 = exec_state.frame(0);
+      assertEquals("f", frame0.func().name());
+      assertEquals(0, frame0.index());
+      assertEquals(31, frame0.sourceLine());
+      assertEquals(2, frame0.sourceColumn());
+      assertEquals(2, frame0.localCount());
+      assertEquals("x", frame0.localName(0));
+      assertEquals(1, frame0.localValue(0).value());
+      assertEquals("y", frame0.localName(1));
+      assertEquals(undefined, frame0.localValue(1).value());
+
+      var frame1 = exec_state.frame(1);
+      assertEquals("m", frame1.func().name());
+      assertEquals(1, frame1.index());
+      assertEquals(35, frame1.sourceLine());
+      assertEquals(2, frame1.sourceColumn());
+      assertEquals(0, frame1.localCount());
+
+      var frame2 = exec_state.frame(2);
+      assertEquals("g", frame2.func().name());
+
+      var frame3 = exec_state.frame(3);
+      assertEquals("", frame3.func().name());
+
+      listenerCalled = true;
+    }
+  } catch (e) {
+    exception = e;
+  };
+};
+
+// Add the debug event listener.
+Debug.setListener(listener);
+
+// Set a break point and call to invoke the debug event listener.
+Debug.setBreakPoint(f, 0, 0);
+g();
+
+// Make sure that the debug event listener vas invoked.
+assertFalse(exception, "exception in listener");
+assertTrue(listenerCalled);

test/debugger/test-api.js

@@ -314,9 +314,10 @@ class DebugWrapper {
   }
 
   receiveMessage(message) {
-    if (printProtocolMessages) print(message);
-
     const parsedMessage = JSON.parse(message);
+    if (printProtocolMessages) {
+      print(JSON.stringify(parsedMessage, undefined, 1));
+    }
     if (parsedMessage.id !== undefined) {
       this.receivedMessages.set(parsedMessage.id, parsedMessage);
     }
@@ -607,6 +608,7 @@ class DebugWrapper {
     const column = frame.location.columnNumber;
     const loc = %ScriptLocationFromLine2(scriptid, line, column, 0);
     const func = { name : () => frame.functionName };
+    const index = JSON.parse(frame.callFrameId).ordinal;
 
     function allScopes() {
       const scopes = [];
@@ -622,6 +624,7 @@ class DebugWrapper {
              evaluate : (expr) => this.evaluateOnCallFrame(frame, expr),
              functionName : () => frame.functionName,
              func : () => func,
+             index : () => index,
              localCount : () => this.execStateFrameLocalCount(frame),
              localName : (ix) => this.execStateFrameLocalName(frame, ix),
              localValue: (ix) => this.execStateFrameLocalValue(frame, ix),