JavaScriptCore-7600.1.4.9.tar.gz

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

diff --git a/dfg/DFGBlockInsertionSet.cpp b/dfg/DFGBlockInsertionSet.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 "DFGBlockInsertionSet.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+BlockInsertionSet::BlockInsertionSet(Graph& graph)
+    : m_graph(graph)
+{
+}
+
+BlockInsertionSet::~BlockInsertionSet() { }
+
+void BlockInsertionSet::insert(const BlockInsertion& insertion)
+{
+    m_insertions.append(insertion);
+}
+
+void BlockInsertionSet::insert(size_t index, PassRefPtr<BasicBlock> block)
+{
+    insert(BlockInsertion(index, block));
+}
+
+BasicBlock* BlockInsertionSet::insert(size_t index, float executionCount)
+{
+    RefPtr<BasicBlock> block = adoptRef(new BasicBlock(
+        UINT_MAX,
+        m_graph.block(0)->variablesAtHead.numberOfArguments(),
+        m_graph.block(0)->variablesAtHead.numberOfLocals(),
+        executionCount));
+    block->isReachable = true;
+    insert(index, block);
+    return block.get();
+}
+
+BasicBlock* BlockInsertionSet::insertBefore(BasicBlock* before, float executionCount)
+{
+    return insert(before->index, executionCount);
+}
+
+bool BlockInsertionSet::execute()
+{
+    if (m_insertions.isEmpty())
+        return false;
+    
+    // We allow insertions to be given to us in any order. So, we need to
+    // sort them before running WTF::executeInsertions.
+    std::sort(m_insertions.begin(), m_insertions.end());
+
+    executeInsertions(m_graph.m_blocks, m_insertions);
+    
+    // Prune out empty entries. This isn't strictly necessary but it's
+    // healthy to keep the block list from growing.
+    unsigned targetIndex = 0;
+    for (unsigned sourceIndex = 0; sourceIndex < m_graph.m_blocks.size();) {
+        RefPtr<BasicBlock> block = m_graph.m_blocks[sourceIndex++];
+        if (!block)
+            continue;
+        m_graph.m_blocks[targetIndex++] = block;
+    }
+    m_graph.m_blocks.resize(targetIndex);
+    
+    // Make sure that the blocks know their new indices.
+    for (unsigned i = 0; i < m_graph.m_blocks.size(); ++i)
+        m_graph.m_blocks[i]->index = i;
+    
+    // And finally, invalidate all analyses that rely on the CFG.
+    m_graph.invalidateCFG();
+    m_graph.dethread();
+    
+    return true;
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+