JavaScriptCore-7600.1.4.9.tar.gz

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

diff --git a/dfg/DFGBasicBlock.cpp b/dfg/DFGBasicBlock.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 "DFGBasicBlock.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+BasicBlock::BasicBlock(
+    unsigned bytecodeBegin, unsigned numArguments, unsigned numLocals, float executionCount)
+    : bytecodeBegin(bytecodeBegin)
+    , index(NoBlock)
+    , isOSRTarget(false)
+    , cfaHasVisited(false)
+    , cfaShouldRevisit(false)
+    , cfaFoundConstants(false)
+    , cfaDidFinish(true)
+    , cfaBranchDirection(InvalidBranchDirection)
+#if !ASSERT_DISABLED
+    , isLinked(false)
+#endif
+    , isReachable(false)
+    , variablesAtHead(numArguments, numLocals)
+    , variablesAtTail(numArguments, numLocals)
+    , valuesAtHead(numArguments, numLocals)
+    , valuesAtTail(numArguments, numLocals)
+    , executionCount(executionCount)
+{
+}
+
+BasicBlock::~BasicBlock() { }
+
+void BasicBlock::ensureLocals(unsigned newNumLocals)
+{
+    variablesAtHead.ensureLocals(newNumLocals);
+    variablesAtTail.ensureLocals(newNumLocals);
+    valuesAtHead.ensureLocals(newNumLocals);
+    valuesAtTail.ensureLocals(newNumLocals);
+}
+
+bool BasicBlock::isInPhis(Node* node) const
+{
+    for (size_t i = 0; i < phis.size(); ++i) {
+        if (phis[i] == node)
+            return true;
+    }
+    return false;
+}
+
+bool BasicBlock::isInBlock(Node* myNode) const
+{
+    for (size_t i = 0; i < numNodes(); ++i) {
+        if (node(i) == myNode)
+            return true;
+    }
+    return false;
+}
+
+void BasicBlock::removePredecessor(BasicBlock* block)
+{
+    for (unsigned i = 0; i < predecessors.size(); ++i) {
+        if (predecessors[i] != block)
+            continue;
+        predecessors[i] = predecessors.last();
+        predecessors.removeLast();
+        return;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+void BasicBlock::replacePredecessor(BasicBlock* from, BasicBlock* to)
+{
+    for (unsigned i = predecessors.size(); i--;) {
+        if (predecessors[i] != from)
+            continue;
+        predecessors[i] = to;
+        return;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+void BasicBlock::dump(PrintStream& out) const
+{
+    out.print("#", index);
+}
+
+BasicBlock::SSAData::SSAData(BasicBlock* block)
+    : availabilityAtHead(OperandsLike, block->variablesAtHead)
+    , availabilityAtTail(OperandsLike, block->variablesAtHead)
+{
+}
+
+BasicBlock::SSAData::~SSAData() { }
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+