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72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
//===-- SSAUpdater.h - Unstructured SSA Update Tool -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the SSAUpdater class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_SSAUPDATER_H
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#define LLVM_TRANSFORMS_UTILS_SSAUPDATER_H
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namespace llvm {
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class Value;
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class BasicBlock;
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class Use;
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/// SSAUpdater - This class updates SSA form for a set of values defined in
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/// multiple blocks. This is used when code duplication or another unstructured
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/// transformation wants to rewrite a set of uses of one value with uses of a
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/// set of values.
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class SSAUpdater {
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/// AvailableVals - This keeps track of which value to use on a per-block
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/// basis. When we insert PHI nodes, we keep track of them here. We use
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/// WeakVH's for the value of the map because we RAUW PHI nodes when we
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/// eliminate them, and want the WeakVH to track this.
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//typedef DenseMap<BasicBlock*, TrackingVH<Value> > AvailableValsTy;
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void *AV;
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/// PrototypeValue is an arbitrary representative value, which we derive names
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/// and a type for PHI nodes.
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Value *PrototypeValue;
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/// IncomingPredInfo - We use this as scratch space when doing our recursive
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/// walk. This should only be used in GetValueInBlockInternal, normally it
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/// should be empty.
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//std::vector<std::pair<BasicBlock*, TrackingVH<Value> > > IncomingPredInfo;
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void *IPI;
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public:
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SSAUpdater();
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~SSAUpdater();
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/// Initialize - Reset this object to get ready for a new set of SSA
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/// updates. ProtoValue is the value used to name PHI nodes.
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void Initialize(Value *ProtoValue);
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/// AddAvailableValue - Indicate that a rewritten value is available in the
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/// specified block with the specified value.
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void AddAvailableValue(BasicBlock *BB, Value *V);
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/// GetValueAtEndOfBlock - Construct SSA form, materializing a value that is
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/// live at the end of the specified block.
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Value *GetValueAtEndOfBlock(BasicBlock *BB);
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/// RewriteUse - Rewrite a use of the symbolic value. This handles PHI nodes,
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/// which use their value in the corresponding predecessor.
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void RewriteUse(Use &U);
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private:
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Value *GetValueAtEndOfBlockInternal(BasicBlock *BB);
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void operator=(const SSAUpdater&); // DO NOT IMPLEMENT
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SSAUpdater(const SSAUpdater&); // DO NOT IMPLEMENT
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};
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} // End llvm namespace
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#endif
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