[debug-wrapper] LiveEdit, frame.restart(), breakpoints

test/mjsunit/debug-liveedit-patch-positions-replace.js

-// Copyright 2010 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,
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-// 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.
-
-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
-
-// Scenario: a function is being changed, which causes enclosing function to
-// have its positions patched; position changing requires new instance of Code
-// object to be introduced; the function happens to be on stack at this moment;
-// later it will resume over new instance of Code.
-// Before the change 2 rinfo are 22 characters away from each other. After the
-// change they are 114 characters away from each other. New instance of Code is
-// required when those numbers cross the border value of 64 (in any direction).
-
-Debug = debug.Debug
-
-eval(
-    "function BeingReplaced(changer, opt_x, opt_y) {\n" +
-    "  changer();\n" +
-    "  var res = new Object();\n" +
-    "  if (opt_x) { res.y = opt_y; }\n" +
-    "  res.a = (function() {})();\n" +
-    "  return res.a;\n" +
-    "}"
-);
-
-var script = Debug.findScript(BeingReplaced);
-
-var orig_body = "{}";
-var patch_pos = script.source.indexOf(orig_body);
-// Line long enough to change rinfo encoding.
-var new_body_patch = "{return 'Capybara';" +
-    "                                                                          " +
-    "}";
-
-var change_log = new Array();
-function Changer() {
-  Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script, patch_pos, orig_body.length, new_body_patch, change_log);
-  print("Change log: " + JSON.stringify(change_log) + "\n");
-}
-
-function NoOp() {
-}
-
-function CallM(changer) {
-  // We expect call IC here after several function runs.
-  return BeingReplaced(changer);
-}
-
-// This several iterations should cause call IC for BeingReplaced call. This IC
-// will keep reference to code object of BeingRepalced function. This reference
-// should also be patched. Unfortunately, this is a manually checked fact (from
-// debugger or debug print) and doesn't work as an automatic test.
-CallM(NoOp);
-CallM(NoOp);
-CallM(NoOp);
-
-var res = CallM(Changer);
-assertEquals("Capybara", res);