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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. llvm-svn: 116820
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
//===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- 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 pass is used to ensure that functions have at most one return and one
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// unwind instruction in them. Additionally, it keeps track of which node is
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// the new exit node of the CFG. If there are no return or unwind instructions
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// in the function, the getReturnBlock/getUnwindBlock methods will return a null
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// pointer.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
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#define LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
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#include "llvm/Pass.h"
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namespace llvm {
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struct UnifyFunctionExitNodes : public FunctionPass {
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BasicBlock *ReturnBlock, *UnwindBlock, *UnreachableBlock;
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public:
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static char ID; // Pass identification, replacement for typeid
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UnifyFunctionExitNodes() : FunctionPass(ID),
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ReturnBlock(0), UnwindBlock(0) {
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initializeUnifyFunctionExitNodesPass(*PassRegistry::getPassRegistry());
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}
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// We can preserve non-critical-edgeness when we unify function exit nodes
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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// getReturn|Unwind|UnreachableBlock - Return the new single (or nonexistant)
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// return, unwind, or unreachable basic blocks in the CFG.
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//
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BasicBlock *getReturnBlock() const { return ReturnBlock; }
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BasicBlock *getUnwindBlock() const { return UnwindBlock; }
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BasicBlock *getUnreachableBlock() const { return UnreachableBlock; }
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virtual bool runOnFunction(Function &F);
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};
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Pass *createUnifyFunctionExitNodesPass();
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} // End llvm namespace
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#endif
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