LLVM  4.0.0
UnifyFunctionExitNodes.h
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1 //===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This pass is used to ensure that functions have at most one return and one
11 // unwind instruction in them. Additionally, it keeps track of which node is
12 // the new exit node of the CFG. If there are no return or unwind instructions
13 // in the function, the getReturnBlock/getUnwindBlock methods will return a null
14 // pointer.
15 //
16 //===----------------------------------------------------------------------===//
17 
18 #ifndef LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
19 #define LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
20 
21 #include "llvm/Pass.h"
22 
23 namespace llvm {
24 
27 
28 public:
29  static char ID; // Pass identification, replacement for typeid
31  ReturnBlock(nullptr), UnwindBlock(nullptr) {
33  }
34 
35  // We can preserve non-critical-edgeness when we unify function exit nodes
36  void getAnalysisUsage(AnalysisUsage &AU) const override;
37 
38  // getReturn|Unwind|UnreachableBlock - Return the new single (or nonexistent)
39  // return, unwind, or unreachable basic blocks in the CFG.
40  //
41  BasicBlock *getReturnBlock() const { return ReturnBlock; }
42  BasicBlock *getUnwindBlock() const { return UnwindBlock; }
44 
45  bool runOnFunction(Function &F) override;
46 };
47 
49 
50 } // End llvm namespace
51 
52 #endif
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
aarch64 AArch64 CCMP Pass
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - This function should be overriden by passes that need analysis information to do t...
#define F(x, y, z)
Definition: MD5.cpp:51
void initializeUnifyFunctionExitNodesPass(PassRegistry &)
Pass * createUnifyFunctionExitNodesPass()
LLVM Basic Block Representation.
Definition: BasicBlock.h:51
BasicBlock * getReturnBlock() const
Represent the analysis usage information of a pass.
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:298
BasicBlock * getUnwindBlock() const
BasicBlock * getUnreachableBlock() const
bool runOnFunction(Function &F) override
runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass...