[debug-wrapper] Further extend the debug wrapper

test/mjsunit/debug-multiple-var-decl.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-debug-as debug
-
-// Test we break at every assignment in a var-statement with multiple
-// variable declarations.
-
-var exception = null;
-var log = []
-
-function f() {
-  var l1 = 1,    // l
-      l2,        // m
-      l3 = 3;    // n
-  let l4,        // o
-      l5 = 5,    // p
-      l6 = 6;    // q
-  const l7 = 7,  // r
-        l8 = 8,  // s
-        l9 = 9;  // t
-  return 0;      // u
-}                // v
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    var line = exec_state.frame(0).sourceLineText();
-    var col = exec_state.frame(0).sourceColumn();
-    print(line);
-    var match = line.match(/\/\/ (\w)$/);
-    assertEquals(2, match.length);
-    log.push(match[1] + col);
-    if (match[1] != "v") {
-      exec_state.prepareStep(Debug.StepAction.StepIn);
-    }
-  } catch (e) {
-    exception = e;
-  }
-}
-
-var Debug = debug.Debug;
-Debug.setListener(listener);
-
-debugger;        // a
-var g1 = 1,      // b
-    g2 = 2,      // c
-    g3;          // d
-let g4 = 4,      // e
-    g5,          // f
-    g6 = 6;      // g
-const g7 = 7,    // h
-      g8 = 8,    // i
-      g9 = f();  // j
-
-Debug.setListener(null);
-
-assertNull(exception);
-
-// Note that let declarations, if not explicitly initialized, implicitly
-// initialize to undefined.
-
-var expected = [
-  "a0",               // debugger statement
-  "b9","c9",          // global var
-  "e9","f4","g9",     // global let
-  "h11","i11","j11",  // global const
-  "l11","n11",        // local var
-  "o6","p11","q11",   // local let
-  "r13","s13","t13",  // local const
-  "u2","v0",          // return
-];
-assertEquals(expected, log);