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<title>[187761] branches/jsc-tailcall/Source/JavaScriptCore</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/187761">187761</a></dd>
<dt>Author</dt> <dd>basile_clement@apple.com</dd>
<dt>Date</dt> <dd>2015-08-03 13:56:15 -0700 (Mon, 03 Aug 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>jsc-tailcall: Get and put inline caches are not properly restoring the stack pointer
https://bugs.webkit.org/show_bug.cgi?id=147583
Reviewed by Michael Saboff.
If there is a tail call in a getter, we can't rely on the stack pointer
being valid after returning from the call.
* jit/Repatch.cpp:
(JSC::generateByIdStub):
* tests/stress/tail-call-in-inline-cache.js: Added.
(tail):
(obj.get x):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchesjsctailcallSourceJavaScriptCoreChangeLog">branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchesjsctailcallSourceJavaScriptCorejitRepatchcpp">branches/jsc-tailcall/Source/JavaScriptCore/jit/Repatch.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#branchesjsctailcallSourceJavaScriptCoretestsstresstailcallininlinecachejs">branches/jsc-tailcall/Source/JavaScriptCore/tests/stress/tail-call-in-inline-cache.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchesjsctailcallSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog (187760 => 187761)</h4>
<pre class="diff"><span>
<span class="info">--- branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog        2015-08-03 20:47:54 UTC (rev 187760)
+++ branches/jsc-tailcall/Source/JavaScriptCore/ChangeLog        2015-08-03 20:56:15 UTC (rev 187761)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2015-08-03 Basile Clement <basile_clement@apple.com>
+
+ jsc-tailcall: Get and put inline caches are not properly restoring the stack pointer
+ https://bugs.webkit.org/show_bug.cgi?id=147583
+
+ Reviewed by Michael Saboff.
+
+ If there is a tail call in a getter, we can't rely on the stack pointer
+ being valid after returning from the call.
+
+ * jit/Repatch.cpp:
+ (JSC::generateByIdStub):
+ * tests/stress/tail-call-in-inline-cache.js: Added.
+ (tail):
+ (obj.get x):
+
</ins><span class="cx"> 2015-08-03 Michael Saboff <msaboff@apple.com>
</span><span class="cx">
</span><span class="cx"> jsc-tailcall: Callee save registers should be saved after the stack pointer is set up
</span></span></pre></div>
<a id="branchesjsctailcallSourceJavaScriptCorejitRepatchcpp"></a>
<div class="modfile"><h4>Modified: branches/jsc-tailcall/Source/JavaScriptCore/jit/Repatch.cpp (187760 => 187761)</h4>
<pre class="diff"><span>
<span class="info">--- branches/jsc-tailcall/Source/JavaScriptCore/jit/Repatch.cpp        2015-08-03 20:47:54 UTC (rev 187760)
+++ branches/jsc-tailcall/Source/JavaScriptCore/jit/Repatch.cpp        2015-08-03 20:56:15 UTC (rev 187761)
</span><span class="lines">@@ -513,9 +513,10 @@
</span><span class="cx"> MacroAssembler::TrustedImmPtr(0));
</span><span class="cx">
</span><span class="cx"> fastPathCall = stubJit.nearCall();
</span><del>-
</del><ins>+
</ins><span class="cx"> stubJit.addPtr(
</span><del>- MacroAssembler::TrustedImm32(alignedNumberOfBytesForCall),
</del><ins>+ MacroAssembler::TrustedImm32(JIT::stackPointerOffsetFor(codeBlock) * sizeof(Register)),
+ GPRInfo::callFrameRegister,
</ins><span class="cx"> MacroAssembler::stackPointerRegister);
</span><span class="cx"> if (kind == CallGetter)
</span><span class="cx"> stubJit.setupResults(valueRegs);
</span><span class="lines">@@ -531,7 +532,8 @@
</span><span class="cx"> slowPathCall = stubJit.nearCall();
</span><span class="cx">
</span><span class="cx"> stubJit.addPtr(
</span><del>- MacroAssembler::TrustedImm32(alignedNumberOfBytesForCall),
</del><ins>+ MacroAssembler::TrustedImm32(JIT::stackPointerOffsetFor(codeBlock) * sizeof(Register)),
+ GPRInfo::callFrameRegister,
</ins><span class="cx"> MacroAssembler::stackPointerRegister);
</span><span class="cx"> if (kind == CallGetter)
</span><span class="cx"> stubJit.setupResults(valueRegs);
</span></span></pre></div>
<a id="branchesjsctailcallSourceJavaScriptCoretestsstresstailcallininlinecachejs"></a>
<div class="addfile"><h4>Added: branches/jsc-tailcall/Source/JavaScriptCore/tests/stress/tail-call-in-inline-cache.js (0 => 187761)</h4>
<pre class="diff"><span>
<span class="info">--- branches/jsc-tailcall/Source/JavaScriptCore/tests/stress/tail-call-in-inline-cache.js         (rev 0)
+++ branches/jsc-tailcall/Source/JavaScriptCore/tests/stress/tail-call-in-inline-cache.js        2015-08-03 20:56:15 UTC (rev 187761)
</span><span class="lines">@@ -0,0 +1,10 @@
</span><ins>+"use strict";
+
+function tail() { }
+
+var obj = {
+ get x() { return tail(0); }
+};
+
+for (var i = 0; i < 10; ++i)
+ obj.x;
</ins></span></pre>
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