JavaScriptCore-1097.3.tar.gz

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

diff --git a/dfg/DFGOSRExit.cpp b/dfg/DFGOSRExit.cpp
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+++ b/dfg/DFGOSRExit.cpp
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+/*
+ * Copyright (C) 2011 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 "DFGOSRExit.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGAssemblyHelpers.h"
+#include "DFGSpeculativeJIT.h"
+
+namespace JSC { namespace DFG {
+
+static unsigned computeNumVariablesForCodeOrigin(
+    CodeBlock* codeBlock, const CodeOrigin& codeOrigin)
+{
+    if (!codeOrigin.inlineCallFrame)
+        return codeBlock->m_numCalleeRegisters;
+    return
+        codeOrigin.inlineCallFrame->stackOffset +
+        baselineCodeBlockForInlineCallFrame(codeOrigin.inlineCallFrame)->m_numCalleeRegisters;
+}
+
+OSRExit::OSRExit(ExitKind kind, JSValueSource jsValueSource, MethodOfGettingAValueProfile valueProfile, MacroAssembler::Jump check, SpeculativeJIT* jit, unsigned recoveryIndex)
+    : m_jsValueSource(jsValueSource)
+    , m_valueProfile(valueProfile)
+    , m_check(check)
+    , m_nodeIndex(jit->m_compileIndex)
+    , m_codeOrigin(jit->m_codeOriginForOSR)
+    , m_codeOriginForExitProfile(m_codeOrigin)
+    , m_recoveryIndex(recoveryIndex)
+    , m_kind(kind)
+    , m_count(0)
+    , m_arguments(jit->m_arguments.size())
+    , m_variables(computeNumVariablesForCodeOrigin(jit->m_jit.graph().m_profiledBlock, jit->m_codeOriginForOSR))
+    , m_lastSetOperand(jit->m_lastSetOperand)
+{
+    ASSERT(m_codeOrigin.isSet());
+    for (unsigned argument = 0; argument < m_arguments.size(); ++argument)
+        m_arguments[argument] = jit->computeValueRecoveryFor(jit->m_arguments[argument]);
+    for (unsigned variable = 0; variable < m_variables.size(); ++variable)
+        m_variables[variable] = jit->computeValueRecoveryFor(jit->m_variables[variable]);
+}
+
+void OSRExit::dump(FILE* out) const
+{
+    for (unsigned argument = 0; argument < m_arguments.size(); ++argument)
+        m_arguments[argument].dump(out);
+    fprintf(out, " : ");
+    for (unsigned variable = 0; variable < m_variables.size(); ++variable)
+        m_variables[variable].dump(out);
+}
+
+bool OSRExit::considerAddingAsFrequentExitSiteSlow(CodeBlock* dfgCodeBlock, CodeBlock* profiledCodeBlock)
+{
+    if (static_cast<double>(m_count) / dfgCodeBlock->speculativeFailCounter() <= Options::osrExitProminenceForFrequentExitSite)
+        return false;
+    
+    return baselineCodeBlockForOriginAndBaselineCodeBlock(m_codeOriginForExitProfile, profiledCodeBlock)->addFrequentExitSite(FrequentExitSite(m_codeOriginForExitProfile.bytecodeIndex, m_kind));
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)