[wasm] Stack inspection support for asm.js frames

test/mjsunit/wasm/asm-debug.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 --expose-debug-as debug --validate-asm
+
+Debug = debug.Debug
+
+// Initialized in setup().
+var exception;
+var break_count;
+var num_wasm_scripts;
+var module;
+
+var filename = '(?:[^ ]+/)?test/mjsunit/wasm/asm-debug.js';
+filename = filename.replace(/\//g, '[/\\\\]');
+
+var expected_stack_entries = [];
+
+function listener(event, exec_state, event_data, data) {
+  try {
+    if (event == Debug.DebugEvent.Break) {
+      ++break_count;
+      // Request frame details.
+      var num_frames = exec_state.frameCount();
+      assertEquals(
+          expected_stack_entries.length, num_frames, 'number of frames');
+      print('Stack Trace (length ' + num_frames + '):');
+      for (var i = 0; i < num_frames; ++i) {
+        var frame = exec_state.frame(i);
+        var script = frame.script();
+        assertNotNull(script);
+        var line = frame.sourceLine() + 1;
+        var column = frame.sourceColumn() + 1;
+        var funcName = frame.func().name();
+        var name = script.name();
+        print(
+            '  [' + i + '] ' + funcName + ' (' + name + ':' + line + ':' +
+            column + ')');
+        assertMatches(filename, name, 'name');
+        assertEquals(
+            expected_stack_entries[i][0], funcName, 'function name at ' + i);
+        assertEquals(expected_stack_entries[i][1], line, 'line at ' + i);
+        assertEquals(expected_stack_entries[i][2], column, 'column at ' + i);
+      }
+    }
+  } catch (e) {
+    print('exception: ' + e);
+    exception = e;
+  }
+};
+
+function generateWasmFromAsmJs(stdlib, foreign, heap) {
+  'use asm';
+  var debugger_fun = foreign.call_debugger;
+  function callDebugger() {
+    debugger_fun();
+  }
+  function redirectFun() {
+    callDebugger();
+  }
+  return redirectFun;
+}
+
+function call_debugger() {
+  debugger;
+}
+
+function setup() {
+  exception = null;
+  break_count = 0;
+}
+
+(function FrameInspection() {
+  setup();
+  var fun =
+      generateWasmFromAsmJs(this, {'call_debugger': call_debugger}, undefined);
+  expected_stack_entries = [
+    ['call_debugger', 66, 3],    // --
+    ['callDebugger', 57, 5],     // --
+    ['redirectFun', 60, 5],      // --
+    ['FrameInspection', 86, 3],  // --
+    ['', 89, 3]
+  ];
+  Debug.setListener(listener);
+  fun();
+  Debug.setListener(null);
+  assertEquals(1, break_count);
+})();