v8/test/mjsunit/debug-liveedit-check-stack.js

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// 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,
// 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.
// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug
unique_id = 1;
function TestBase(name) {
print("TestBase constructor: " + name);
this.ChooseAnimal = eval(
"/* " + unique_id + "*/\n" +
"(function ChooseAnimal(callback) {\n " +
" callback();\n" +
" return 'Cat';\n" +
"})\n"
);
// Prevents eval script caching.
unique_id++;
var script = Debug.findScript(this.ChooseAnimal);
var orig_animal = "'Cat'";
var patch_pos = script.source.indexOf(orig_animal);
var new_animal_patch = "'Capybara'";
var got_exception = false;
var successfully_changed = false;
// Should be called from Debug context.
this.ScriptChanger = function() {
assertEquals(false, successfully_changed, "applying patch second time");
// Runs in debugger context.
var change_log = new Array();
try {
Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script, patch_pos, orig_animal.length, new_animal_patch, change_log);
} finally {
print("Change log: " + JSON.stringify(change_log) + "\n");
}
successfully_changed = true;
};
}
function Noop() {}
function WrapInCatcher(f, holder) {
return function() {
delete holder[0];
try {
f();
} catch (e) {
if (e instanceof Debug.LiveEdit.Failure) {
holder[0] = e;
} else {
throw e;
}
}
};
}
function WrapInNativeCall(f) {
return function() {
return Debug.ExecuteInDebugContext(f, true);
};
}
function WrapInDebuggerCall(f) {
return function() {
return Debug.ExecuteInDebugContext(f, false);
};
}
function WrapInRestartProof(f) {
var already_called = false;
return function() {
if (already_called) {
return;
}
already_called = true;
f();
}
}
function WrapInConstructor(f) {
return function() {
return new function() {
f();
};
}
}
// A series of tests. In each test we call ChooseAnimal function that calls
// a callback that attempts to modify the function on the fly.
test = new TestBase("First test ChooseAnimal without edit");
assertEquals("Cat", test.ChooseAnimal(Noop));
test = new TestBase("Test without function on stack");
test.ScriptChanger();
assertEquals("Capybara", test.ChooseAnimal(Noop));
test = new TestBase("Test with function on stack");
assertEquals("Capybara", test.ChooseAnimal(WrapInDebuggerCall(WrapInRestartProof(test.ScriptChanger))));
test = new TestBase("Test with function on stack and with constructor frame");
assertEquals("Capybara", test.ChooseAnimal(WrapInConstructor(WrapInDebuggerCall(WrapInRestartProof(test.ScriptChanger)))));
test = new TestBase("Test with C++ frame above ChooseAnimal frame");
exception_holder = {};
assertEquals("Cat", test.ChooseAnimal(WrapInNativeCall(WrapInDebuggerCall(WrapInCatcher(test.ScriptChanger, exception_holder)))));
assertTrue(!!exception_holder[0]);