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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
Debug = debug.Debug;
var step = 0;
var exception = null;
function listener(event, exec_state, event_data, data) {
if (event != Debug.DebugEvent.Break) return;
try {
if (step == 0) {
assertEquals("error", exec_state.frame(0).evaluate("e").value());
exec_state.frame(0).evaluate("write_0('foo')");
exec_state.frame(0).evaluate("write_1('modified')");
} else {
assertEquals("argument", exec_state.frame(0).evaluate("e").value());
exec_state.frame(0).evaluate("write_2('bar')");
}
step++;
} catch (e) {
print(e + e.stack);
exception = e;
}
}
Debug.setListener(listener);
function f(e, x) {
try {
throw "error";
} catch(e) {
// In ES2015 hoisting semantics, 'x' binds to the argument
// and 'e' binds to the exception.
function write_0(v) { e = v }
function write_1(v) { x = v }
debugger;
assertEquals("foo", e); // overwritten by the debugger
}
assertEquals("argument", e); // debugger did not overwrite
function write_2(v) { e = v }
debugger;
assertEquals("bar", e);
assertEquals("modified", x);
}
f("argument")
assertNull(exception);
assertEquals(2, step);
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