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debug-return-value.js
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116 lines (106 loc) · 4.36 KB
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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.
Debug = debug.Debug
let listener_complete = false;
let exceptionThrown = false;
let break_count = 0;
let expected_return_value = 0;
let expected_source_position = [];
let debugger_source_position = 0;
// Listener which expects to do four steps to reach returning from the function.
function listener(event, exec_state, event_data, data) {
try {
if (event == Debug.DebugEvent.Break)
{
break_count++;
if (break_count < 4) {
switch (break_count) {
case 1:
// Collect the position of the debugger statement.
debugger_source_position = exec_state.frame(0).sourcePosition();
break;
case 2:
// Position now at the if statement.
assertEquals(expected_source_position.shift() + debugger_source_position,
exec_state.frame(0).sourcePosition());
break;
case 3:
// Position now at either of the returns.
assertEquals(expected_source_position.shift() + debugger_source_position,
exec_state.frame(0).sourcePosition());
break;
default:
fail("Unexpected");
}
exec_state.prepareStep(Debug.StepAction.StepInto);
} else {
// Position at the end of the function.
assertEquals(expected_source_position.shift() + debugger_source_position,
exec_state.frame(0).sourcePosition());
// Just about to return from the function.
assertEquals(expected_return_value,
exec_state.frame(0).returnValue().value());
listener_complete = true;
}
}
} catch (e) {
exceptionThrown = true;
print(e + e.stack)
};
};
// Add the debug event listener.
Debug.setListener(listener);
// Four steps from the debugger statement in this function will position us at
// the function return.
// 0 1 2 3 4 5
// 0123456789012345678901234567890123456789012345678901
function f(x) {debugger; if (x) { return 1; } else { return 2; } };
// Call f expecting different return values.
break_count = 0;
expected_return_value = 2;
expected_source_position = [10, 38, 47];
listener_complete = false;
f();
assertFalse(exceptionThrown, "exception in listener");
assertTrue(listener_complete);
assertEquals(4, break_count);
break_count = 0;
expected_return_value = 1;
expected_source_position = [10, 19, 28];
listener_complete = false;
f(true);
assertFalse(exceptionThrown, "exception in listener");
assertTrue(listener_complete);
assertEquals(4, break_count);
break_count = 0;
expected_return_value = 2;
expected_source_position = [10, 38, 47];
listener_complete = false;
f(false);
assertFalse(exceptionThrown, "exception in listener");
assertTrue(listener_complete);
assertEquals(4, break_count);