634fb9152c
Added support for more precise break points when debugging and stepping. To achieve that additional nop instructions are inserted where breaking would otherwise be impossible. The number of nop instructions inserted are sufficient to make place for patching with a call to a debug break code stub. On Intel that is 5 nop's for 32-bit and 13 for 64-bit. Om ARM 3 nop instructions (12 bytes) are required. In order to avoid inserting nop's in to many places a simple ast checker have been added to check whether there are breakable code in a statement or expression. If it is possible to break in an expression no additional break enabeling code is inserted. Added break locations to the true and false part of a conditional expression. Added stepping tests to cover more constructs. These changes are only in the full compiler. Changed the default value for the option --debugger in teh d8 shell from true to false. The reason for this is that with --debugger turned on the full compiler will be used for all code in when running d8, which can be unexpeceted. Review URL: http://codereview.chromium.org/2693002 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4820 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
84 lines
3.1 KiB
JavaScript
84 lines
3.1 KiB
JavaScript
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --expose-debug-as debug
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// Get the Debug object exposed from the debug context global object.
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Debug = debug.Debug
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// Simple debug event handler which first time hit will perform 1000 steps and
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// second time hit will evaluate and store the value of "i". If requires that
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// the global property "state" is initially zero.
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var bp1, bp2;
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function listener(event, exec_state, event_data, data) {
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if (event == Debug.DebugEvent.Break) {
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if (state == 0) {
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exec_state.prepareStep(Debug.StepAction.StepIn, 1000);
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state = 1;
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} else if (state == 1) {
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result = exec_state.frame().evaluate("i").value();
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// Clear the break point on line 2 if set.
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if (bp2) {
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Debug.clearBreakPoint(bp2);
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}
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}
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}
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};
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// Add the debug event listener.
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Debug.setListener(listener);
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// Test debug event for break point.
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function f() {
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var i; // Line 1.
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for (i = 0; i < 1000; i++) { // Line 2.
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x = 1; // Line 3.
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}
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};
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// Set a breakpoint on the for statement (line 1).
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bp1 = Debug.setBreakPoint(f, 1);
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// Check that performing 1000 steps will make i 499.
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state = 0;
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result = -1;
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f();
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assertEquals(499, result);
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// Check that performing 1000 steps with a break point on the statement in the
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// for loop (line 2) will only make i 0 as a real break point breaks even when
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// multiple steps have been requested.
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state = 0;
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result = -1;
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bp2 = Debug.setBreakPoint(f, 3);
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f();
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assertEquals(0, result);
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// Get rid of the debug event listener.
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Debug.setListener(null);
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