v8/test/mjsunit/debug-step-stub-callfunction.js
yurys@chromium.org ab54e95377 Support stepping in functions called using CallFunction stub. When Debug::PrepareStep is called to prepare 'step in' and current code target is CallFunction stub, the debugger will find function being called on the expression stack and flood it with one shot breakpoints.
BreakLocationIterator changed to treat 'debugger;' statements as a possible break location. Since 'debugger;' statement should always invoke debugger it is hanled in a special way.

Related Chromium issue:
http://code.google.com/p/chromium/issues/detail?id=17978
Review URL: http://codereview.chromium.org/195015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2830 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2009-09-07 07:20:05 +00:00

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3.1 KiB
JavaScript

// Copyright 2008 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
// Simple debug event handler which counts the number of breaks hit and steps.
var break_break_point_hit_count = 0;
function listener(event, exec_state, event_data, data) {
if (event == Debug.DebugEvent.Break) {
break_break_point_hit_count++;
// Continue stepping until returned to bottom frame.
if (exec_state.frameCount() > 1) {
exec_state.prepareStep(Debug.StepAction.StepIn);
}
}
};
// Add the debug event listener.
Debug.setListener(listener);
// Use 'eval' to ensure that the call to print is through CodeStub CallFunction.
// See Ia32CodeGenerator::VisitCall and Ia32CodeGenerator::CallWithArguments.
function f() {
debugger;
eval('');
print('Hello, world!');
};
break_break_point_hit_count = 0;
f();
assertEquals(6, break_break_point_hit_count);
// Use an inner function to ensure that the function call is through CodeStub
// CallFunction see Ia32CodeGenerator::VisitCall and
// Ia32CodeGenerator::CallWithArguments.
function g() {
function h() {}
debugger;
h();
};
break_break_point_hit_count = 0;
g();
assertEquals(5, break_break_point_hit_count);
// Use an inner function to ensure that the function call is through CodeStub
// CallFunction.
function testCallInExpreesion() {
function h() {}
debugger;
var x = 's' + h(10, 20);
};
break_break_point_hit_count = 0;
testCallInExpreesion();
assertEquals(5, break_break_point_hit_count);
// Get rid of the debug event listener.
Debug.setListener(null);