90b3370374
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
127 lines
4.7 KiB
JavaScript
127 lines
4.7 KiB
JavaScript
// Copyright 2010 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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// Scenario: some function is being edited; the outer function has to have its
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// positions patched. Accoring to a special markup of function text
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// corresponding byte-code PCs should coincide before change and after it.
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Debug = debug.Debug
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eval(
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"function F1() { return 5; }\n" +
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"function ChooseAnimal(/*$*/ ) {\n" +
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"/*$*/ var x = F1(/*$*/ );\n" +
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"/*$*/ var res/*$*/ =/*$*/ (function() { return 'Cat'; } )();\n" +
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"/*$*/ var y/*$*/ = F2(/*$*/ F1()/*$*/ , F1(/*$*/ )/*$*/ );\n" +
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"/*$*/ if (/*$*/ x.toString(/*$*/ )) { /*$*/ y = 3;/*$*/ } else {/*$*/ y = 8;/*$*/ }\n" +
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"/*$*/ var z = /*$*/ x * y;\n" +
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"/*$*/ return/*$*/ res/*$*/ + z;/*$*/ }\n" +
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"function F2(x, y) { return x + y; }"
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);
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// Find all *$* markers in text of the function and read corresponding statement
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// PCs.
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function ReadMarkerPositions(func) {
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var text = func.toString();
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var positions = new Array();
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var match;
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var pattern = /\/\*\$\*\//g;
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while ((match = pattern.exec(text)) != null) {
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positions.push(match.index);
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}
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return positions;
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}
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function ReadPCMap(func, positions) {
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var res = new Array();
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for (var i = 0; i < positions.length; i++) {
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var pc = Debug.LiveEdit.GetPcFromSourcePos(func, positions[i]);
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if (typeof pc === 'undefined') {
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// Function was marked for recompilation and it's code was replaced with a
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// stub. This can happen at any time especially if we are running with
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// --stress-opt. There is no way to get PCs now.
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return;
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}
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res.push(pc);
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}
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return res;
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}
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function ApplyPatch(orig_animal, new_animal) {
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var res = ChooseAnimal();
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assertEquals(orig_animal + "15", res);
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var script = Debug.findScript(ChooseAnimal);
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var orig_string = "'" + orig_animal + "'";
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var patch_string = "'" + new_animal + "'";
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var patch_pos = script.source.indexOf(orig_string);
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var change_log = new Array();
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Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script,
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patch_pos,
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orig_string.length,
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patch_string,
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change_log);
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print("Change log: " + JSON.stringify(change_log) + "\n");
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var markerPositions = ReadMarkerPositions(ChooseAnimal);
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var pcArray = ReadPCMap(ChooseAnimal, markerPositions);
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var res = ChooseAnimal();
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assertEquals(new_animal + "15", res);
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return pcArray;
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}
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var pcArray1 = ApplyPatch('Cat', 'Dog');
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// When we patched function for the first time it was deoptimized.
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// Check that after the second patch maping between sources position and
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// pcs will not change.
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var pcArray2 = ApplyPatch('Dog', 'Capybara');
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print(pcArray1);
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print(pcArray2);
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// Function can be marked for recompilation at any point (especially if we are
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// running with --stress-opt). When we mark function for recompilation we
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// replace it's code with stub. So there is no reliable way to get PCs for
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// function.
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if (pcArray1 && pcArray2) {
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assertArrayEquals(pcArray1, pcArray2);
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}
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