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<title>[191845] trunk/Source/JavaScriptCore</title>
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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/191845">191845</a></dd>
<dt>Author</dt> <dd>fpizlo@apple.com</dd>
<dt>Date</dt> <dd>2015-10-31 16:01:30 -0700 (Sat, 31 Oct 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Air needs a late register liveness phase that calls Special::reportUsedRegisters()
https://bugs.webkit.org/show_bug.cgi?id=150511
Reviewed by Saam Barati.
This change adds such a phase. In the process of writing it, I was reminded about the
glaring efficiency bugs in Air::Liveness and so I filed a bug and added FIXMEs.
* JavaScriptCore.xcodeproj/project.pbxproj:
* b3/air/AirAllocateStack.cpp:
(JSC::B3::Air::allocateStack):
* b3/air/AirGenerate.cpp:
(JSC::B3::Air::generate):
* b3/air/AirReportUsedRegisters.cpp: Added.
(JSC::B3::Air::reportUsedRegisters):
* b3/air/AirReportUsedRegisters.h: Added.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreJavaScriptCorexcodeprojprojectpbxproj">trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3airAirAllocateStackcpp">trunk/Source/JavaScriptCore/b3/air/AirAllocateStack.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3airAirGeneratecpp">trunk/Source/JavaScriptCore/b3/air/AirGenerate.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreb3airAirReportUsedRegisterscpp">trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3airAirReportUsedRegistersh">trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (191844 => 191845)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2015-10-31 17:48:47 UTC (rev 191844)
+++ trunk/Source/JavaScriptCore/ChangeLog 2015-10-31 23:01:30 UTC (rev 191845)
</span><span class="lines">@@ -1,3 +1,22 @@
</span><ins>+2015-10-31 Filip Pizlo <fpizlo@apple.com>
+
+ Air needs a late register liveness phase that calls Special::reportUsedRegisters()
+ https://bugs.webkit.org/show_bug.cgi?id=150511
+
+ Reviewed by Saam Barati.
+
+ This change adds such a phase. In the process of writing it, I was reminded about the
+ glaring efficiency bugs in Air::Liveness and so I filed a bug and added FIXMEs.
+
+ * JavaScriptCore.xcodeproj/project.pbxproj:
+ * b3/air/AirAllocateStack.cpp:
+ (JSC::B3::Air::allocateStack):
+ * b3/air/AirGenerate.cpp:
+ (JSC::B3::Air::generate):
+ * b3/air/AirReportUsedRegisters.cpp: Added.
+ (JSC::B3::Air::reportUsedRegisters):
+ * b3/air/AirReportUsedRegisters.h: Added.
+
</ins><span class="cx"> 2015-10-31 Brian Burg <bburg@apple.com>
</span><span class="cx">
</span><span class="cx"> Builtins generator should put WebCore-only wrappers in the per-builtin header
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreJavaScriptCorexcodeprojprojectpbxproj"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj (191844 => 191845)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj 2015-10-31 17:48:47 UTC (rev 191844)
+++ trunk/Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj 2015-10-31 23:01:30 UTC (rev 191845)
</span><span class="lines">@@ -311,6 +311,8 @@
</span><span class="cx"> 0F426A491460CBB700131F8F /* VirtualRegister.h in Headers */ = {isa = PBXBuildFile; fileRef = 0F426A461460CBAB00131F8F /* VirtualRegister.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><span class="cx"> 0F426A4B1460CD6E00131F8F /* DataFormat.h in Headers */ = {isa = PBXBuildFile; fileRef = 0F426A4A1460CD6B00131F8F /* DataFormat.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><span class="cx"> 0F431738146BAC69007E3890 /* ListableHandler.h in Headers */ = {isa = PBXBuildFile; fileRef = 0F431736146BAC65007E3890 /* ListableHandler.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><ins>+ 0F45703C1BE45F0A0062A629 /* AirReportUsedRegisters.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 0F45703A1BE45F0A0062A629 /* AirReportUsedRegisters.cpp */; };
+ 0F45703D1BE45F0A0062A629 /* AirReportUsedRegisters.h in Headers */ = {isa = PBXBuildFile; fileRef = 0F45703B1BE45F0A0062A629 /* AirReportUsedRegisters.h */; };
</ins><span class="cx"> 0F46808214BA572D00BFE272 /* JITExceptions.h in Headers */ = {isa = PBXBuildFile; fileRef = 0F46808014BA572700BFE272 /* JITExceptions.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><span class="cx"> 0F46808314BA573100BFE272 /* JITExceptions.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 0F46807F14BA572700BFE272 /* JITExceptions.cpp */; };
</span><span class="cx"> 0F4680A314BA7F8D00BFE272 /* LLIntExceptions.h in Headers */ = {isa = PBXBuildFile; fileRef = 0F46809E14BA7F8200BFE272 /* LLIntExceptions.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><span class="lines">@@ -2325,6 +2327,8 @@
</span><span class="cx"> 0F426A461460CBAB00131F8F /* VirtualRegister.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = VirtualRegister.h; sourceTree = "<group>"; };
</span><span class="cx"> 0F426A4A1460CD6B00131F8F /* DataFormat.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DataFormat.h; sourceTree = "<group>"; };
</span><span class="cx"> 0F431736146BAC65007E3890 /* ListableHandler.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ListableHandler.h; sourceTree = "<group>"; };
</span><ins>+ 0F45703A1BE45F0A0062A629 /* AirReportUsedRegisters.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = AirReportUsedRegisters.cpp; path = b3/air/AirReportUsedRegisters.cpp; sourceTree = "<group>"; };
+ 0F45703B1BE45F0A0062A629 /* AirReportUsedRegisters.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = AirReportUsedRegisters.h; path = b3/air/AirReportUsedRegisters.h; sourceTree = "<group>"; };
</ins><span class="cx"> 0F46807F14BA572700BFE272 /* JITExceptions.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JITExceptions.cpp; sourceTree = "<group>"; };
</span><span class="cx"> 0F46808014BA572700BFE272 /* JITExceptions.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JITExceptions.h; sourceTree = "<group>"; };
</span><span class="cx"> 0F46809D14BA7F8200BFE272 /* LLIntExceptions.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = LLIntExceptions.cpp; path = llint/LLIntExceptions.cpp; sourceTree = "<group>"; };
</span><span class="lines">@@ -4494,6 +4498,8 @@
</span><span class="cx"> 264091FA1BE2FD4100684DB2 /* AirOpcode.opcodes */,
</span><span class="cx"> 0FEC855E1BDACDC70080FF74 /* AirPhaseScope.cpp */,
</span><span class="cx"> 0FEC855F1BDACDC70080FF74 /* AirPhaseScope.h */,
</span><ins>+ 0F45703A1BE45F0A0062A629 /* AirReportUsedRegisters.cpp */,
+ 0F45703B1BE45F0A0062A629 /* AirReportUsedRegisters.h */,
</ins><span class="cx"> 0FEC85601BDACDC70080FF74 /* AirRegisterPriority.cpp */,
</span><span class="cx"> 0FEC85611BDACDC70080FF74 /* AirRegisterPriority.h */,
</span><span class="cx"> 0FEC85621BDACDC70080FF74 /* AirSpecial.cpp */,
</span><span class="lines">@@ -6774,6 +6780,7 @@
</span><span class="cx"> 0FD8A32617D51F5700CA2C40 /* DFGOSREntrypointCreationPhase.h in Headers */,
</span><span class="cx"> 0FC0976A1468A6F700CF2442 /* DFGOSRExit.h in Headers */,
</span><span class="cx"> 0F235BEC17178E7300690C7F /* DFGOSRExitBase.h in Headers */,
</span><ins>+ 0F45703D1BE45F0A0062A629 /* AirReportUsedRegisters.h in Headers */,
</ins><span class="cx"> 0FFB921C16D02F110055A5DB /* DFGOSRExitCompilationInfo.h in Headers */,
</span><span class="cx"> 0FEC85351BDACDAC0080FF74 /* B3StackSlotValue.h in Headers */,
</span><span class="cx"> 0FC0977114693AF500CF2442 /* DFGOSRExitCompiler.h in Headers */,
</span><span class="lines">@@ -8377,6 +8384,7 @@
</span><span class="cx"> 62774DAA1B8D4B190006F05A /* FTLJSTailCall.cpp in Sources */,
</span><span class="cx"> 0FB4FB731BC843140025CA5A /* FTLLazySlowPath.cpp in Sources */,
</span><span class="cx"> 0F8F2B95172E04A0007DBDA5 /* FTLLink.cpp in Sources */,
</span><ins>+ 0F45703C1BE45F0A0062A629 /* AirReportUsedRegisters.cpp in Sources */,
</ins><span class="cx"> 0FCEFADF180738C000472CE4 /* FTLLocation.cpp in Sources */,
</span><span class="cx"> 0FEA0A0F170513DB00BB722C /* FTLLowerDFGToLLVM.cpp in Sources */,
</span><span class="cx"> 0FEC85001BDACDAC0080FF74 /* B3BasicBlock.cpp in Sources */,
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3airAirAllocateStackcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/b3/air/AirAllocateStack.cpp (191844 => 191845)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/air/AirAllocateStack.cpp 2015-10-31 17:48:47 UTC (rev 191844)
+++ trunk/Source/JavaScriptCore/b3/air/AirAllocateStack.cpp 2015-10-31 23:01:30 UTC (rev 191845)
</span><span class="lines">@@ -141,6 +141,8 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> // Now we handle the anonymous slots.
</span><ins>+ // FIXME: We should tell Liveness to only track StackSlots.
+ // https://bugs.webkit.org/show_bug.cgi?id=150751
</ins><span class="cx"> Liveness<Arg> liveness(code);
</span><span class="cx"> IndexMap<StackSlot, HashSet<StackSlot*>> interference(code.stackSlots().size());
</span><span class="cx"> Vector<StackSlot*> slots;
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3airAirGeneratecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/b3/air/AirGenerate.cpp (191844 => 191845)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/air/AirGenerate.cpp 2015-10-31 17:48:47 UTC (rev 191844)
+++ trunk/Source/JavaScriptCore/b3/air/AirGenerate.cpp 2015-10-31 23:01:30 UTC (rev 191845)
</span><span class="lines">@@ -32,6 +32,7 @@
</span><span class="cx"> #include "AirCode.h"
</span><span class="cx"> #include "AirGenerationContext.h"
</span><span class="cx"> #include "AirHandleCalleeSaves.h"
</span><ins>+#include "AirReportUsedRegisters.h"
</ins><span class="cx"> #include "AirSpillEverything.h"
</span><span class="cx"> #include "AirValidate.h"
</span><span class="cx"> #include "B3Common.h"
</span><span class="lines">@@ -75,9 +76,7 @@
</span><span class="cx"> // FIXME: We should really have a code layout optimization here.
</span><span class="cx"> // https://bugs.webkit.org/show_bug.cgi?id=150478
</span><span class="cx">
</span><del>- // FIXME: We need a late liveness analysis over registers to fill in the
- // Special::reportUsedRegisters().
- // https://bugs.webkit.org/show_bug.cgi?id=150511
</del><ins>+ reportUsedRegisters(code);
</ins><span class="cx">
</span><span class="cx"> if (shouldValidateIR())
</span><span class="cx"> validate(code);
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3airAirReportUsedRegisterscpp"></a>
<div class="addfile"><h4>Added: trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.cpp (0 => 191845)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.cpp (rev 0)
+++ trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.cpp 2015-10-31 23:01:30 UTC (rev 191845)
</span><span class="lines">@@ -0,0 +1,68 @@
</span><ins>+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
+ */
+
+#include "config.h"
+#include "AirReportUsedRegisters.h"
+
+#if ENABLE(B3_JIT)
+
+#include "AirCode.h"
+#include "AirInstInlines.h"
+#include "AirLiveness.h"
+#include "AirPhaseScope.h"
+
+namespace JSC { namespace B3 { namespace Air {
+
+void reportUsedRegisters(Code& code)
+{
+ PhaseScope phaseScope(code, "reportUsedRegisters");
+
+ // FIXME: We should tell liveness to only track Regs.
+ // https://bugs.webkit.org/show_bug.cgi?id=150751
+ Liveness<Tmp> liveness(code);
+
+ for (BasicBlock* block : code) {
+ Liveness<Tmp>::LocalCalc localCalc(liveness, block);
+
+ for (unsigned instIndex = block->size(); instIndex--;) {
+ Inst& inst = block->at(instIndex);
+ if (inst.hasSpecial()) {
+ RegisterSet registerSet;
+ for (Tmp tmp : localCalc.live()) {
+ if (tmp.isReg())
+ registerSet.set(tmp.reg());
+ }
+ inst.reportUsedRegisters(registerSet);
+ }
+ localCalc.execute(inst);
+ }
+ }
+}
+
+} } } // namespace JSC::B3::Air
+
+#endif // ENABLE(B3_JIT)
+
+
</ins></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3airAirReportUsedRegistersh"></a>
<div class="addfile"><h4>Added: trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.h (0 => 191845)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.h (rev 0)
+++ trunk/Source/JavaScriptCore/b3/air/AirReportUsedRegisters.h 2015-10-31 23:01:30 UTC (rev 191845)
</span><span class="lines">@@ -0,0 +1,44 @@
</span><ins>+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
+ */
+
+#ifndef AirReportUsedRegisters_h
+#define AirReportUsedRegisters_h
+
+#if ENABLE(B3_JIT)
+
+namespace JSC { namespace B3 { namespace Air {
+
+class Code;
+
+// Performs a liveness analysis over registers and reports the live registers to every Special.
+
+void reportUsedRegisters(Code&);
+
+} } } // namespace JSC::B3::Air
+
+#endif // ENABLE(B3_JIT)
+
+#endif // AirReportUsedRegisters_h
+
</ins></span></pre>
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