v8/test/mjsunit/debug-evaluate-const.js

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// Copyright 2013 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
Debug = debug.Debug
listenerComplete = false;
exception = false;
// var0: init after break point, changed by debug eval.
// const0: init before break point, changed by debug eval.
// const1: init after break point, materialized but untouched by debug eval.
// const2: init after break point, materialized and changed by debug eval.
// const3: context allocated const, init before break point, changed by eval.
function f() {
var var1 = 21;
const const3 = 3;
function g() {
const const0 = 0;
assertEquals(undefined, const1);
assertEquals(undefined, const2);
assertEquals(3, const3);
assertEquals(21, var1);
debugger; // Break point.
assertEquals(30, var0);
// TODO(yangguo): debug evaluate should not be able to alter
// stack-allocated const values
// assertEquals(0, const0);
assertEquals(undefined, const1);
assertEquals(undefined, const2);
var var0 = 20;
const const1 = 1;
const const2 = 2;
assertEquals(20, var0);
assertEquals(1, const1);
assertEquals(2, const2);
}
g();
assertEquals(31, var1);
assertEquals(3, const3);
}
function listener(event, exec_state, event_data, data) {
if (event != Debug.DebugEvent.Break) return;
try {
var frame = exec_state.frame(0);
var evaluate = function(something) {
return frame.evaluate(something).value()
}
var count = frame.localCount();
assertEquals(4, count);
var expectation = { "const0" : 0,
"const1" : undefined,
"const2" : undefined,
"const3" : 3,
"var0" : undefined,
"var1" : 21 };
for (var i = 0; i < frame.localCount(); ++i) {
var name = frame.localName(i);
var value = frame.localValue(i).value();
assertEquals(expectation[name], value);
}
evaluate('const0 = 10');
evaluate('const2 = 12');
evaluate('const3 = 13');
evaluate('var0 = 30');
evaluate('var1 = 31');
// Indicate that all was processed.
listenerComplete = true;
} catch (e) {
exception = e;
print("Caught something. " + e + " " + e.stack);
};
};
// Run and compile before debugger is active.
try { f(); } catch (e) { }
Debug.setListener(listener);
f();
Debug.setListener(null);
assertFalse(exception, "exception in listener")
assertTrue(listenerComplete);