JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / bytecode / PutByIdStatus.cpp

diff --git a/bytecode/PutByIdStatus.cpp b/bytecode/PutByIdStatus.cpp
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+++ b/bytecode/PutByIdStatus.cpp
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+/*
+ * Copyright (C) 2012 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 "PutByIdStatus.h"
+
+#include "CodeBlock.h"
+#include "LowLevelInterpreter.h"
+#include "Structure.h"
+#include "StructureChain.h"
+
+namespace JSC {
+
+PutByIdStatus PutByIdStatus::computeFromLLInt(CodeBlock* profiledBlock, unsigned bytecodeIndex, Identifier& ident)
+{
+    UNUSED_PARAM(profiledBlock);
+    UNUSED_PARAM(bytecodeIndex);
+    UNUSED_PARAM(ident);
+#if ENABLE(LLINT)
+    Instruction* instruction = profiledBlock->instructions().begin() + bytecodeIndex;
+
+    Structure* structure = instruction[4].u.structure.get();
+    if (!structure)
+        return PutByIdStatus(NoInformation, 0, 0, 0, notFound);
+    
+    if (instruction[0].u.opcode == llint_op_put_by_id) {
+        size_t offset = structure->get(*profiledBlock->globalData(), ident);
+        if (offset == notFound)
+            return PutByIdStatus(NoInformation, 0, 0, 0, notFound);
+        
+        return PutByIdStatus(SimpleReplace, structure, 0, 0, offset);
+    }
+    
+    ASSERT(instruction[0].u.opcode == llint_op_put_by_id_transition_direct
+           || instruction[0].u.opcode == llint_op_put_by_id_transition_normal);
+    
+    Structure* newStructure = instruction[6].u.structure.get();
+    StructureChain* chain = instruction[7].u.structureChain.get();
+    ASSERT(newStructure);
+    ASSERT(chain);
+    
+    size_t offset = newStructure->get(*profiledBlock->globalData(), ident);
+    if (offset == notFound)
+        return PutByIdStatus(NoInformation, 0, 0, 0, notFound);
+    
+    return PutByIdStatus(SimpleTransition, structure, newStructure, chain, offset);
+#else
+    return PutByIdStatus(NoInformation, 0, 0, 0, notFound);
+#endif
+}
+
+PutByIdStatus PutByIdStatus::computeFor(CodeBlock* profiledBlock, unsigned bytecodeIndex, Identifier& ident)
+{
+    UNUSED_PARAM(profiledBlock);
+    UNUSED_PARAM(bytecodeIndex);
+    UNUSED_PARAM(ident);
+#if ENABLE(JIT) && ENABLE(VALUE_PROFILER)
+    if (!profiledBlock->numberOfStructureStubInfos())
+        return computeFromLLInt(profiledBlock, bytecodeIndex, ident);
+    
+    if (profiledBlock->likelyToTakeSlowCase(bytecodeIndex))
+        return PutByIdStatus(TakesSlowPath, 0, 0, 0, notFound);
+    
+    StructureStubInfo& stubInfo = profiledBlock->getStubInfo(bytecodeIndex);
+    if (!stubInfo.seen)
+        return computeFromLLInt(profiledBlock, bytecodeIndex, ident);
+    
+    switch (stubInfo.accessType) {
+    case access_unset:
+        return computeFromLLInt(profiledBlock, bytecodeIndex, ident);
+        
+    case access_put_by_id_replace: {
+        size_t offset = stubInfo.u.putByIdReplace.baseObjectStructure->get(
+            *profiledBlock->globalData(), ident);
+        if (offset != notFound) {
+            return PutByIdStatus(
+                SimpleReplace,
+                stubInfo.u.putByIdReplace.baseObjectStructure.get(),
+                0, 0,
+                offset);
+        }
+        return PutByIdStatus(TakesSlowPath, 0, 0, 0, notFound);
+    }
+        
+    case access_put_by_id_transition_normal:
+    case access_put_by_id_transition_direct: {
+        size_t offset = stubInfo.u.putByIdTransition.structure->get(
+            *profiledBlock->globalData(), ident);
+        if (offset != notFound) {
+            return PutByIdStatus(
+                SimpleTransition,
+                stubInfo.u.putByIdTransition.previousStructure.get(),
+                stubInfo.u.putByIdTransition.structure.get(),
+                stubInfo.u.putByIdTransition.chain.get(),
+                offset);
+        }
+        return PutByIdStatus(TakesSlowPath, 0, 0, 0, notFound);
+    }
+        
+    default:
+        return PutByIdStatus(TakesSlowPath, 0, 0, 0, notFound);
+    }
+#else // ENABLE(JIT)
+    return PutByIdStatus(NoInformation, 0, 0, 0, notFound);
+#endif // ENABLE(JIT)
+}
+
+} // namespace JSC
+