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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/194158">194158</a></dd>
<dt>Author</dt> <dd>sbarati@apple.com</dd>
<dt>Date</dt> <dd>2015-12-16 10:36:20 -0800 (Wed, 16 Dec 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Add "explicit operator bool" to ScratchRegisterAllocator::PreservedState
https://bugs.webkit.org/show_bug.cgi?id=152337
Reviewed by Mark Lam.
If we have a default constructor, we should also have a way
to tell if a PreservedState is invalid.
* jit/ScratchRegisterAllocator.cpp:
(JSC::ScratchRegisterAllocator::preserveReusedRegistersByPushing):
(JSC::ScratchRegisterAllocator::restoreReusedRegistersByPopping):
* jit/ScratchRegisterAllocator.h:
(JSC::ScratchRegisterAllocator::PreservedState::PreservedState):
(JSC::ScratchRegisterAllocator::PreservedState::operator bool):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCorejitScratchRegisterAllocatorcpp">trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCorejitScratchRegisterAllocatorh">trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (194157 => 194158)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2015-12-16 18:32:22 UTC (rev 194157)
+++ trunk/Source/JavaScriptCore/ChangeLog 2015-12-16 18:36:20 UTC (rev 194158)
</span><span class="lines">@@ -1,3 +1,20 @@
</span><ins>+2015-12-16 Saam barati <sbarati@apple.com>
+
+ Add "explicit operator bool" to ScratchRegisterAllocator::PreservedState
+ https://bugs.webkit.org/show_bug.cgi?id=152337
+
+ Reviewed by Mark Lam.
+
+ If we have a default constructor, we should also have a way
+ to tell if a PreservedState is invalid.
+
+ * jit/ScratchRegisterAllocator.cpp:
+ (JSC::ScratchRegisterAllocator::preserveReusedRegistersByPushing):
+ (JSC::ScratchRegisterAllocator::restoreReusedRegistersByPopping):
+ * jit/ScratchRegisterAllocator.h:
+ (JSC::ScratchRegisterAllocator::PreservedState::PreservedState):
+ (JSC::ScratchRegisterAllocator::PreservedState::operator bool):
+
</ins><span class="cx"> 2015-12-16 Caitlin Potter <caitp@igalia.com>
</span><span class="cx">
</span><span class="cx"> [JSC] fix error message for eval/arguments CoverInitializedName in strict code
</span></span></pre></div>
<a id="trunkSourceJavaScriptCorejitScratchRegisterAllocatorcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.cpp (194157 => 194158)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.cpp 2015-12-16 18:32:22 UTC (rev 194157)
+++ trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.cpp 2015-12-16 18:36:20 UTC (rev 194158)
</span><span class="lines">@@ -125,8 +125,9 @@
</span><span class="cx"> return PreservedState(stackAdjustmentSize, extraStackSpace);
</span><span class="cx"> }
</span><span class="cx">
</span><del>-void ScratchRegisterAllocator::restoreReusedRegistersByPopping(MacroAssembler& jit, const ScratchRegisterAllocator::PreservedState preservedState)
</del><ins>+void ScratchRegisterAllocator::restoreReusedRegistersByPopping(MacroAssembler& jit, const ScratchRegisterAllocator::PreservedState& preservedState)
</ins><span class="cx"> {
</span><ins>+ RELEASE_ASSERT(preservedState);
</ins><span class="cx"> if (!didReuseRegisters())
</span><span class="cx"> return;
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCorejitScratchRegisterAllocatorh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.h (194157 => 194158)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.h 2015-12-16 18:32:22 UTC (rev 194157)
+++ trunk/Source/JavaScriptCore/jit/ScratchRegisterAllocator.h 2015-12-16 18:36:20 UTC (rev 194158)
</span><span class="lines">@@ -70,20 +70,23 @@
</span><span class="cx">
</span><span class="cx"> struct PreservedState {
</span><span class="cx"> PreservedState()
</span><del>- : PreservedState(0)
</del><ins>+ : numberOfBytesPreserved(std::numeric_limits<unsigned>::max())
+ , extraStackSpaceRequirement(ExtraStackSpace::SpaceForCCall)
</ins><span class="cx"> { }
</span><span class="cx">
</span><del>- PreservedState(unsigned numberOfBytes, ExtraStackSpace extraStackSpace = ExtraStackSpace::NoExtraSpace)
</del><ins>+ PreservedState(unsigned numberOfBytes, ExtraStackSpace extraStackSpace)
</ins><span class="cx"> : numberOfBytesPreserved(numberOfBytes)
</span><span class="cx"> , extraStackSpaceRequirement(extraStackSpace)
</span><span class="cx"> { }
</span><span class="cx">
</span><ins>+ explicit operator bool() const { return numberOfBytesPreserved != std::numeric_limits<unsigned>::max(); }
+
</ins><span class="cx"> unsigned numberOfBytesPreserved;
</span><span class="cx"> ExtraStackSpace extraStackSpaceRequirement;
</span><span class="cx"> };
</span><span class="cx">
</span><span class="cx"> PreservedState preserveReusedRegistersByPushing(MacroAssembler& jit, ExtraStackSpace);
</span><del>- void restoreReusedRegistersByPopping(MacroAssembler& jit, PreservedState);
</del><ins>+ void restoreReusedRegistersByPopping(MacroAssembler& jit, const PreservedState&);
</ins><span class="cx">
</span><span class="cx"> RegisterSet usedRegistersForCall() const;
</span><span class="cx">
</span></span></pre>
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