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// Copyright 2014 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 --allow-natives-syntax
var Debug = debug.Debug;
var LiveEdit = Debug.LiveEdit;
unique_id = 0;
var Generator = (function*(){}).constructor;
function assertIteratorResult(value, done, result) {
assertEquals({value: value, done: done}, result);
}
function MakeGenerator() {
// Prevents eval script caching.
unique_id++;
return Generator('callback',
"/* " + unique_id + "*/\n" +
"yield callback();\n" +
"return 'Cat';\n");
}
function MakeFunction() {
// Prevents eval script caching.
unique_id++;
return Function('callback',
"/* " + unique_id + "*/\n" +
"callback();\n" +
"return 'Cat';\n");
}
// First, try MakeGenerator with no perturbations.
(function(){
var generator = MakeGenerator();
function callback() {};
var iter = generator(callback);
assertIteratorResult(undefined, false, iter.next());
assertIteratorResult("Cat", true, iter.next());
})();
function patch(fun, from, to) {
function debug() {
var log = new Array();
var script = Debug.findScript(fun);
var pos = script.source.indexOf(from);
try {
LiveEdit.TestApi.ApplySingleChunkPatch(script, pos, from.length, to,
log);
} finally {
print("Change log: " + JSON.stringify(log) + "\n");
}
}
%ExecuteInDebugContext(debug);
}
// Try to edit a MakeGenerator while it's running, then again while it's
// stopped.
(function(){
var generator = MakeGenerator();
var gen_patch_attempted = false;
function attempt_gen_patch() {
assertFalse(gen_patch_attempted);
gen_patch_attempted = true;
assertThrows(function() { patch(generator, "'Cat'", "'Capybara'") },
LiveEdit.Failure);
};
var iter = generator(attempt_gen_patch);
assertIteratorResult(undefined, false, iter.next());
// Patch should not succeed because there is a live generator activation on
// the stack.
assertIteratorResult("Cat", true, iter.next());
assertTrue(gen_patch_attempted);
// At this point one iterator is live, but closed, so the patch will succeed.
patch(generator, "'Cat'", "'Capybara'");
iter = generator(function(){});
assertIteratorResult(undefined, false, iter.next());
// Patch successful.
assertIteratorResult("Capybara", true, iter.next());
// Patching will fail however when a live iterator is suspended.
iter = generator(function(){});
assertIteratorResult(undefined, false, iter.next());
assertThrows(function() { patch(generator, "'Capybara'", "'Tapir'") },
LiveEdit.Failure);
assertIteratorResult("Capybara", true, iter.next());
// Try to patch functions with activations inside and outside generator
// function activations. We should succeed in the former case, but not in the
// latter.
var fun_outside = MakeFunction();
var fun_inside = MakeFunction();
var fun_patch_attempted = false;
var fun_patch_restarted = false;
function attempt_fun_patches() {
if (fun_patch_attempted) {
assertFalse(fun_patch_restarted);
fun_patch_restarted = true;
return;
}
fun_patch_attempted = true;
// Patching outside a generator activation must fail.
assertThrows(function() { patch(fun_outside, "'Cat'", "'Cobra'") },
LiveEdit.Failure);
// Patching inside a generator activation may succeed.
patch(fun_inside, "'Cat'", "'Koala'");
}
iter = generator(function() { return fun_inside(attempt_fun_patches) });
assertEquals('Cat',
fun_outside(function () {
assertIteratorResult('Koala', false, iter.next());
assertTrue(fun_patch_restarted);
}));
})();
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