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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/199093">199093</a></dd>
<dt>Author</dt> <dd>fpizlo@apple.com</dd>
<dt>Date</dt> <dd>2016-04-05 21:46:12 -0700 (Tue, 05 Apr 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Improve some other cases of context-sensitive inlining
https://bugs.webkit.org/show_bug.cgi?id=156277
Reviewed by Benjamin Poulain.
This implements some improvements for inlining:
- We no longer do guarded inlining when the profiling doesn't come from a stub. Doing so would have
been risky, and according to benchmarks, it wasn't common enough to matter. I think it's better to
err on the side of not inlining.
- The jneq_ptr pattern for variadic calls no longer breaks the basic block. Not breaking the block
increases the chances of the parser seeing the callee constant. While inlining doesn't require a
callee constant, sometimes it makes a difference. Note that we were previously breaking the block
for no reason at all: if the boundary after jneq_ptr is a jump target from some other jump, then
the parser will automatically break the block for us. There is no reason to add any block breaking
ourselves since we implement jneq_ptr by ignoring the affirmative jump destination and inserting a
check and falling through.
- get_by_id handling now tries to apply some common sense to its status object. In particular, if
the source is a NewObject and there was no interfering operation that could clobber the structure,
then we know which case of a polymorphic GetByIdStatus we would take. This arises in some
constructor patterns.
Long term, we should address all of these cases comprehensively by having a late inliner. The inliner
being part of the bytecode parser means that there is a lot of complexity in the parser and it
prevents us from inlining upon learning new information from static analysis. But for now, I think
it's fine to experiment with one-off hacks, if only to learn what the possibilities are.
This is a 14% speed-up on Octane/raytrace.
* bytecode/CallLinkStatus.cpp:
(JSC::CallLinkStatus::dump):
* bytecode/CallLinkStatus.h:
(JSC::CallLinkStatus::couldTakeSlowPath):
(JSC::CallLinkStatus::setCouldTakeSlowPath):
(JSC::CallLinkStatus::variants):
(JSC::CallLinkStatus::size):
(JSC::CallLinkStatus::at):
* bytecode/GetByIdStatus.cpp:
(JSC::GetByIdStatus::makesCalls):
(JSC::GetByIdStatus::filter):
(JSC::GetByIdStatus::dump):
* bytecode/GetByIdStatus.h:
(JSC::GetByIdStatus::wasSeenInJIT):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::handleCall):
(JSC::DFG::ByteCodeParser::refineStatically):
(JSC::DFG::ByteCodeParser::handleVarargsCall):
(JSC::DFG::ByteCodeParser::handleInlining):
(JSC::DFG::ByteCodeParser::handleGetById):
(JSC::DFG::ByteCodeParser::parseBlock):
* runtime/Options.h:</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCorebytecodeCallLinkStatuscpp">trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCorebytecodeCallLinkStatush">trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.h</a></li>
<li><a href="#trunkSourceJavaScriptCorebytecodeGetByIdStatuscpp">trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCorebytecodeGetByIdStatush">trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.h</a></li>
<li><a href="#trunkSourceJavaScriptCoredfgDFGByteCodeParsercpp">trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreruntimeOptionsh">trunk/Source/JavaScriptCore/runtime/Options.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (199092 => 199093)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2016-04-06 03:55:11 UTC (rev 199092)
+++ trunk/Source/JavaScriptCore/ChangeLog 2016-04-06 04:46:12 UTC (rev 199093)
</span><span class="lines">@@ -1,3 +1,59 @@
</span><ins>+2016-04-05 Filip Pizlo <fpizlo@apple.com>
+
+ Improve some other cases of context-sensitive inlining
+ https://bugs.webkit.org/show_bug.cgi?id=156277
+
+ Reviewed by Benjamin Poulain.
+
+ This implements some improvements for inlining:
+
+ - We no longer do guarded inlining when the profiling doesn't come from a stub. Doing so would have
+ been risky, and according to benchmarks, it wasn't common enough to matter. I think it's better to
+ err on the side of not inlining.
+
+ - The jneq_ptr pattern for variadic calls no longer breaks the basic block. Not breaking the block
+ increases the chances of the parser seeing the callee constant. While inlining doesn't require a
+ callee constant, sometimes it makes a difference. Note that we were previously breaking the block
+ for no reason at all: if the boundary after jneq_ptr is a jump target from some other jump, then
+ the parser will automatically break the block for us. There is no reason to add any block breaking
+ ourselves since we implement jneq_ptr by ignoring the affirmative jump destination and inserting a
+ check and falling through.
+
+ - get_by_id handling now tries to apply some common sense to its status object. In particular, if
+ the source is a NewObject and there was no interfering operation that could clobber the structure,
+ then we know which case of a polymorphic GetByIdStatus we would take. This arises in some
+ constructor patterns.
+
+ Long term, we should address all of these cases comprehensively by having a late inliner. The inliner
+ being part of the bytecode parser means that there is a lot of complexity in the parser and it
+ prevents us from inlining upon learning new information from static analysis. But for now, I think
+ it's fine to experiment with one-off hacks, if only to learn what the possibilities are.
+
+ This is a 14% speed-up on Octane/raytrace.
+
+ * bytecode/CallLinkStatus.cpp:
+ (JSC::CallLinkStatus::dump):
+ * bytecode/CallLinkStatus.h:
+ (JSC::CallLinkStatus::couldTakeSlowPath):
+ (JSC::CallLinkStatus::setCouldTakeSlowPath):
+ (JSC::CallLinkStatus::variants):
+ (JSC::CallLinkStatus::size):
+ (JSC::CallLinkStatus::at):
+ * bytecode/GetByIdStatus.cpp:
+ (JSC::GetByIdStatus::makesCalls):
+ (JSC::GetByIdStatus::filter):
+ (JSC::GetByIdStatus::dump):
+ * bytecode/GetByIdStatus.h:
+ (JSC::GetByIdStatus::wasSeenInJIT):
+ * dfg/DFGByteCodeParser.cpp:
+ (JSC::DFG::ByteCodeParser::handleCall):
+ (JSC::DFG::ByteCodeParser::refineStatically):
+ (JSC::DFG::ByteCodeParser::handleVarargsCall):
+ (JSC::DFG::ByteCodeParser::handleInlining):
+ (JSC::DFG::ByteCodeParser::handleGetById):
+ (JSC::DFG::ByteCodeParser::parseBlock):
+ * runtime/Options.h:
+
</ins><span class="cx"> 2016-04-05 Saam barati <sbarati@apple.com>
</span><span class="cx">
</span><span class="cx"> JSC SamplingProfiler: Use a thread + sleep loop instead of WTF::WorkQueue for taking samples
</span></span></pre></div>
<a id="trunkSourceJavaScriptCorebytecodeCallLinkStatuscpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.cpp (199092 => 199093)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.cpp 2016-04-06 03:55:11 UTC (rev 199092)
+++ trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.cpp 2016-04-06 04:46:12 UTC (rev 199093)
</span><span class="lines">@@ -342,6 +342,9 @@
</span><span class="cx"> if (m_couldTakeSlowPath)
</span><span class="cx"> out.print(comma, "Could Take Slow Path");
</span><span class="cx">
</span><ins>+ if (m_isBasedOnStub)
+ out.print(comma, "Based On Stub");
+
</ins><span class="cx"> if (!m_variants.isEmpty())
</span><span class="cx"> out.print(comma, listDump(m_variants));
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCorebytecodeCallLinkStatush"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.h (199092 => 199093)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.h 2016-04-06 03:55:11 UTC (rev 199092)
+++ trunk/Source/JavaScriptCore/bytecode/CallLinkStatus.h 2016-04-06 04:46:12 UTC (rev 199093)
</span><span class="lines">@@ -101,6 +101,8 @@
</span><span class="cx">
</span><span class="cx"> bool couldTakeSlowPath() const { return m_couldTakeSlowPath; }
</span><span class="cx">
</span><ins>+ void setCouldTakeSlowPath(bool value) { m_couldTakeSlowPath = value; }
+
</ins><span class="cx"> CallVariantList variants() const { return m_variants; }
</span><span class="cx"> unsigned size() const { return m_variants.size(); }
</span><span class="cx"> CallVariant at(unsigned i) const { return m_variants[i]; }
</span></span></pre></div>
<a id="trunkSourceJavaScriptCorebytecodeGetByIdStatuscpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.cpp (199092 => 199093)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.cpp 2016-04-06 03:55:11 UTC (rev 199092)
+++ trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.cpp 2016-04-06 04:46:12 UTC (rev 199093)
</span><span class="lines">@@ -350,6 +350,22 @@
</span><span class="cx"> return false;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+void GetByIdStatus::filter(const StructureSet& set)
+{
+ if (m_state != Simple)
+ return;
+
+ // FIXME: We could also filter the variants themselves.
+
+ m_variants.removeAllMatching(
+ [&] (GetByIdVariant& variant) -> bool {
+ return !variant.structureSet().overlaps(set);
+ });
+
+ if (m_variants.isEmpty())
+ m_state = NoInformation;
+}
+
</ins><span class="cx"> void GetByIdStatus::dump(PrintStream& out) const
</span><span class="cx"> {
</span><span class="cx"> out.print("(");
</span></span></pre></div>
<a id="trunkSourceJavaScriptCorebytecodeGetByIdStatush"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.h (199092 => 199093)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.h 2016-04-06 03:55:11 UTC (rev 199092)
+++ trunk/Source/JavaScriptCore/bytecode/GetByIdStatus.h 2016-04-06 04:46:12 UTC (rev 199093)
</span><span class="lines">@@ -92,6 +92,9 @@
</span><span class="cx">
</span><span class="cx"> bool wasSeenInJIT() const { return m_wasSeenInJIT; }
</span><span class="cx">
</span><ins>+ // Attempts to reduce the set of variants to fit the given structure set. This may be approximate.
+ void filter(const StructureSet&);
+
</ins><span class="cx"> void dump(PrintStream&) const;
</span><span class="cx">
</span><span class="cx"> private:
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoredfgDFGByteCodeParsercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp (199092 => 199093)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp 2016-04-06 03:55:11 UTC (rev 199092)
+++ trunk/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp 2016-04-06 04:46:12 UTC (rev 199093)
</span><span class="lines">@@ -33,8 +33,10 @@
</span><span class="cx"> #include "CallLinkStatus.h"
</span><span class="cx"> #include "CodeBlock.h"
</span><span class="cx"> #include "CodeBlockWithJITType.h"
</span><ins>+#include "DFGAbstractHeap.h"
</ins><span class="cx"> #include "DFGArrayMode.h"
</span><span class="cx"> #include "DFGCapabilities.h"
</span><ins>+#include "DFGClobberize.h"
</ins><span class="cx"> #include "DFGClobbersExitState.h"
</span><span class="cx"> #include "DFGGraph.h"
</span><span class="cx"> #include "DFGJITCode.h"
</span><span class="lines">@@ -177,6 +179,7 @@
</span><span class="cx"> template<typename ChecksFunctor>
</span><span class="cx"> bool handleMinMax(int resultOperand, NodeType op, int registerOffset, int argumentCountIncludingThis, const ChecksFunctor& insertChecks);
</span><span class="cx">
</span><ins>+ void refineStatically(CallLinkStatus&, Node* callTarget);
</ins><span class="cx"> // Handle calls. This resolves issues surrounding inlining and intrinsics.
</span><span class="cx"> enum Terminality { Terminal, NonTerminal };
</span><span class="cx"> Terminality handleCall(
</span><span class="lines">@@ -230,8 +233,7 @@
</span><span class="cx"> Node* store(Node* base, unsigned identifier, const PutByIdVariant&, Node* value);
</span><span class="cx">
</span><span class="cx"> void handleGetById(
</span><del>- int destinationOperand, SpeculatedType, Node* base, unsigned identifierNumber,
- const GetByIdStatus&);
</del><ins>+ int destinationOperand, SpeculatedType, Node* base, unsigned identifierNumber, GetByIdStatus);
</ins><span class="cx"> void emitPutById(
</span><span class="cx"> Node* base, unsigned identifierNumber, Node* value, const PutByIdStatus&, bool isDirect);
</span><span class="cx"> void handlePutById(
</span><span class="lines">@@ -1167,16 +1169,23 @@
</span><span class="cx"> registerOffset, callLinkStatus, getPrediction());
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+void ByteCodeParser::refineStatically(CallLinkStatus& callLinkStatus, Node* callTarget)
+{
+ if (callTarget->isCellConstant()) {
+ callLinkStatus.setProvenConstantCallee(CallVariant(callTarget->asCell()));
+ return;
+ }
+}
+
</ins><span class="cx"> ByteCodeParser::Terminality ByteCodeParser::handleCall(
</span><span class="cx"> int result, NodeType op, InlineCallFrame::Kind kind, unsigned instructionSize,
</span><span class="cx"> Node* callTarget, int argumentCountIncludingThis, int registerOffset,
</span><span class="cx"> CallLinkStatus callLinkStatus, SpeculatedType prediction)
</span><span class="cx"> {
</span><span class="cx"> ASSERT(registerOffset <= 0);
</span><ins>+
+ refineStatically(callLinkStatus, callTarget);
</ins><span class="cx">
</span><del>- if (callTarget->isCellConstant())
- callLinkStatus.setProvenConstantCallee(CallVariant(callTarget->asCell()));
-
</del><span class="cx"> if (Options::verboseDFGByteCodeParsing())
</span><span class="cx"> dataLog(" Handling call at ", currentCodeOrigin(), ": ", callLinkStatus, "\n");
</span><span class="cx">
</span><span class="lines">@@ -1227,8 +1236,7 @@
</span><span class="cx"> CallLinkStatus callLinkStatus = CallLinkStatus::computeFor(
</span><span class="cx"> m_inlineStackTop->m_profiledBlock, currentCodeOrigin(),
</span><span class="cx"> m_inlineStackTop->m_callLinkInfos, m_callContextMap);
</span><del>- if (callTarget->isCellConstant())
- callLinkStatus.setProvenConstantCallee(CallVariant(callTarget->asCell()));
</del><ins>+ refineStatically(callLinkStatus, callTarget);
</ins><span class="cx">
</span><span class="cx"> if (Options::verboseDFGByteCodeParsing())
</span><span class="cx"> dataLog(" Varargs call link status at ", currentCodeOrigin(), ": ", callLinkStatus, "\n");
</span><span class="lines">@@ -1785,6 +1793,18 @@
</span><span class="cx"> return false;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+ // If the claim is that this did not originate from a stub, then we don't want to emit a switch
+ // statement. Whenever the non-stub profiling says that it could take slow path, it really means that
+ // it has no idea.
+ if (!Options::usePolymorphicCallInliningForNonStubStatus()
+ && !callLinkStatus.isBasedOnStub()) {
+ if (verbose) {
+ dataLog("Bailing inlining (non-stub polymorphism).\n");
+ dataLog("Stack: ", currentCodeOrigin(), "\n");
+ }
+ return false;
+ }
+
</ins><span class="cx"> unsigned oldOffset = m_currentIndex;
</span><span class="cx">
</span><span class="cx"> bool allAreClosureCalls = true;
</span><span class="lines">@@ -2867,8 +2887,24 @@
</span><span class="cx">
</span><span class="cx"> void ByteCodeParser::handleGetById(
</span><span class="cx"> int destinationOperand, SpeculatedType prediction, Node* base, unsigned identifierNumber,
</span><del>- const GetByIdStatus& getByIdStatus)
</del><ins>+ GetByIdStatus getByIdStatus)
</ins><span class="cx"> {
</span><ins>+ // Attempt to reduce the set of things in the GetByIdStatus.
+ if (base->op() == NewObject) {
+ bool ok = true;
+ for (unsigned i = m_currentBlock->size(); i--;) {
+ Node* node = m_currentBlock->at(i);
+ if (node == base)
+ break;
+ if (writesOverlap(m_graph, node, JSCell_structureID)) {
+ ok = false;
+ break;
+ }
+ }
+ if (ok)
+ getByIdStatus.filter(base->structure());
+ }
+
</ins><span class="cx"> NodeType getById = getByIdStatus.makesCalls() ? GetByIdFlush : GetById;
</span><span class="cx">
</span><span class="cx"> if (!getByIdStatus.isSimple() || !getByIdStatus.numVariants() || !Options::useAccessInlining()) {
</span><span class="lines">@@ -4173,8 +4209,7 @@
</span><span class="cx"> OpInfo(m_graph.freeze(static_cast<JSCell*>(actualPointerFor(
</span><span class="cx"> m_inlineStackTop->m_codeBlock, currentInstruction[2].u.specialPointer)))),
</span><span class="cx"> get(VirtualRegister(currentInstruction[1].u.operand)));
</span><del>- addToGraph(Jump, OpInfo(m_currentIndex + OPCODE_LENGTH(op_jneq_ptr)));
- LAST_OPCODE(op_jneq_ptr);
</del><ins>+ NEXT_OPCODE(op_jneq_ptr);
</ins><span class="cx">
</span><span class="cx"> case op_resolve_scope: {
</span><span class="cx"> int dst = currentInstruction[1].u.operand;
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreruntimeOptionsh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/runtime/Options.h (199092 => 199093)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/runtime/Options.h 2016-04-06 03:55:11 UTC (rev 199092)
+++ trunk/Source/JavaScriptCore/runtime/Options.h 2016-04-06 04:46:12 UTC (rev 199093)
</span><span class="lines">@@ -195,6 +195,7 @@
</span><span class="cx"> v(bool, usePolyvariantDevirtualization, true, nullptr) \
</span><span class="cx"> v(bool, usePolymorphicAccessInlining, true, nullptr) \
</span><span class="cx"> v(bool, usePolymorphicCallInlining, true, nullptr) \
</span><ins>+ v(bool, usePolymorphicCallInliningForNonStubStatus, false, nullptr) \
</ins><span class="cx"> v(unsigned, maxPolymorphicCallVariantListSize, 15, nullptr) \
</span><span class="cx"> v(unsigned, maxPolymorphicCallVariantListSizeForTopTier, 5, nullptr) \
</span><span class="cx"> v(unsigned, maxPolymorphicCallVariantsForInlining, 5, nullptr) \
</span></span></pre>
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