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081c34b725
must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
//===- LazyValueInfo.h - Value constraint analysis --------------*- 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 defines the interface for lazy computation of value constraint
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// information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_LAZYVALUEINFO_H
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#define LLVM_ANALYSIS_LAZYVALUEINFO_H
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#include "llvm/Pass.h"
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namespace llvm {
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class Constant;
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class TargetData;
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class Value;
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/// LazyValueInfo - This pass computes, caches, and vends lazy value constraint
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/// information.
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class LazyValueInfo : public FunctionPass {
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class TargetData *TD;
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void *PImpl;
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LazyValueInfo(const LazyValueInfo&); // DO NOT IMPLEMENT.
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void operator=(const LazyValueInfo&); // DO NOT IMPLEMENT.
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public:
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static char ID;
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LazyValueInfo() : FunctionPass(ID), PImpl(0) {
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initializeLazyValueInfoPass(*PassRegistry::getPassRegistry());
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}
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~LazyValueInfo() { assert(PImpl == 0 && "releaseMemory not called"); }
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/// Tristate - This is used to return true/false/dunno results.
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enum Tristate {
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Unknown = -1, False = 0, True = 1
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};
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// Public query interface.
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/// getPredicateOnEdge - Determine whether the specified value comparison
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/// with a constant is known to be true or false on the specified CFG edge.
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/// Pred is a CmpInst predicate.
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Tristate getPredicateOnEdge(unsigned Pred, Value *V, Constant *C,
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BasicBlock *FromBB, BasicBlock *ToBB);
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/// getConstant - Determine whether the specified value is known to be a
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/// constant at the end of the specified block. Return null if not.
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Constant *getConstant(Value *V, BasicBlock *BB);
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/// getConstantOnEdge - Determine whether the specified value is known to be a
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/// constant on the specified edge. Return null if not.
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Constant *getConstantOnEdge(Value *V, BasicBlock *FromBB, BasicBlock *ToBB);
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/// threadEdge - Inform the analysis cache that we have threaded an edge from
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/// PredBB to OldSucc to be from PredBB to NewSucc instead.
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void threadEdge(BasicBlock *PredBB, BasicBlock *OldSucc, BasicBlock *NewSucc);
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/// eraseBlock - Inform the analysis cache that we have erased a block.
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void eraseBlock(BasicBlock *BB);
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// Implementation boilerplate.
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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virtual void releaseMemory();
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virtual bool runOnFunction(Function &F);
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};
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} // end namespace llvm
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#endif
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