JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / dfg / DFGJITCode.cpp

diff --git a/dfg/DFGJITCode.cpp b/dfg/DFGJITCode.cpp
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+/*
+ * Copyright (C) 2013, 2014 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 "DFGJITCode.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "CodeBlock.h"
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+JITCode::JITCode()
+    : DirectJITCode(DFGJIT)
+#if ENABLE(FTL_JIT)
+    , osrEntryRetry(0)
+    , abandonOSREntry(false)
+#endif // ENABLE(FTL_JIT)
+{
+}
+
+JITCode::~JITCode()
+{
+}
+
+CommonData* JITCode::dfgCommon()
+{
+    return &common;
+}
+
+JITCode* JITCode::dfg()
+{
+    return this;
+}
+
+void JITCode::shrinkToFit()
+{
+    common.shrinkToFit();
+    osrEntry.shrinkToFit();
+    osrExit.shrinkToFit();
+    speculationRecovery.shrinkToFit();
+    minifiedDFG.prepareAndShrink();
+    variableEventStream.shrinkToFit();
+}
+
+void JITCode::reconstruct(
+    CodeBlock* codeBlock, CodeOrigin codeOrigin, unsigned streamIndex,
+    Operands<ValueRecovery>& result)
+{
+    variableEventStream.reconstruct(
+        codeBlock, codeOrigin, minifiedDFG, streamIndex, result);
+}
+
+void JITCode::reconstruct(
+    ExecState* exec, CodeBlock* codeBlock, CodeOrigin codeOrigin, unsigned streamIndex,
+    Operands<JSValue>& result)
+{
+    Operands<ValueRecovery> recoveries;
+    reconstruct(codeBlock, codeOrigin, streamIndex, recoveries);
+    
+    result = Operands<JSValue>(OperandsLike, recoveries);
+    for (size_t i = result.size(); i--;) {
+        int operand = result.operandForIndex(i);
+        
+        if (codeOrigin == CodeOrigin(0)
+            && operandIsArgument(operand)
+            && !VirtualRegister(operand).toArgument()
+            && codeBlock->codeType() == FunctionCode
+            && codeBlock->specializationKind() == CodeForConstruct) {
+            // Ugh. If we're in a constructor, the 'this' argument may hold garbage. It will
+            // also never be used. It doesn't matter what we put into the value for this,
+            // but it has to be an actual value that can be grokked by subsequent DFG passes,
+            // so we sanitize it here by turning it into Undefined.
+            result[i] = jsUndefined();
+            continue;
+        }
+        
+        result[i] = recoveries[i].recover(exec);
+    }
+}
+
+#if ENABLE(FTL_JIT)
+bool JITCode::checkIfOptimizationThresholdReached(CodeBlock* codeBlock)
+{
+    ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
+    return tierUpCounter.checkIfThresholdCrossedAndSet(codeBlock->baselineVersion());
+}
+
+void JITCode::optimizeNextInvocation(CodeBlock* codeBlock)
+{
+    ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
+    if (Options::verboseOSR())
+        dataLog(*codeBlock, ": FTL-optimizing next invocation.\n");
+    tierUpCounter.setNewThreshold(0, codeBlock->baselineVersion());
+}
+
+void JITCode::dontOptimizeAnytimeSoon(CodeBlock* codeBlock)
+{
+    ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
+    if (Options::verboseOSR())
+        dataLog(*codeBlock, ": Not FTL-optimizing anytime soon.\n");
+    tierUpCounter.deferIndefinitely();
+}
+
+void JITCode::optimizeAfterWarmUp(CodeBlock* codeBlock)
+{
+    ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
+    if (Options::verboseOSR())
+        dataLog(*codeBlock, ": FTL-optimizing after warm-up.\n");
+    CodeBlock* baseline = codeBlock->baselineVersion();
+    tierUpCounter.setNewThreshold(
+        baseline->adjustedCounterValue(Options::thresholdForFTLOptimizeAfterWarmUp()),
+        baseline);
+}
+
+void JITCode::optimizeSoon(CodeBlock* codeBlock)
+{
+    ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
+    if (Options::verboseOSR())
+        dataLog(*codeBlock, ": FTL-optimizing soon.\n");
+    CodeBlock* baseline = codeBlock->baselineVersion();
+    tierUpCounter.setNewThreshold(
+        baseline->adjustedCounterValue(Options::thresholdForFTLOptimizeSoon()),
+        baseline);
+}
+
+void JITCode::forceOptimizationSlowPathConcurrently(CodeBlock* codeBlock)
+{
+    ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
+    if (Options::verboseOSR())
+        dataLog(*codeBlock, ": Forcing slow path concurrently for FTL entry.\n");
+    tierUpCounter.forceSlowPathConcurrently();
+}
+
+void JITCode::setOptimizationThresholdBasedOnCompilationResult(
+    CodeBlock* codeBlock, CompilationResult result)
+{
+    ASSERT(codeBlock->jitType() == JITCode::DFGJIT);
+    switch (result) {
+    case CompilationSuccessful:
+        optimizeNextInvocation(codeBlock);
+        codeBlock->baselineVersion()->m_hasBeenCompiledWithFTL = true;
+        return;
+    case CompilationFailed:
+        dontOptimizeAnytimeSoon(codeBlock);
+        codeBlock->baselineVersion()->m_didFailFTLCompilation = true;
+        return;
+    case CompilationDeferred:
+        optimizeAfterWarmUp(codeBlock);
+        return;
+    case CompilationInvalidated:
+        // This is weird - it will only happen in cases when the DFG code block (i.e.
+        // the code block that this JITCode belongs to) is also invalidated. So it
+        // doesn't really matter what we do. But, we do the right thing anyway. Note
+        // that us counting the reoptimization actually means that we might count it
+        // twice. But that's generally OK. It's better to overcount reoptimizations
+        // than it is to undercount them.
+        codeBlock->baselineVersion()->countReoptimization();
+        optimizeAfterWarmUp(codeBlock);
+        return;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+#endif // ENABLE(FTL_JIT)
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)