mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-22 07:32:48 +00:00
34695381d6
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21412 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
//===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This pass is used to ensure that functions have at most one return and one
|
|
// unwind instruction in them. Additionally, it keeps track of which node is
|
|
// the new exit node of the CFG. If there are no return or unwind instructions
|
|
// in the function, the getReturnBlock/getUnwindBlock methods will return a null
|
|
// pointer.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
|
|
#define LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
|
|
|
|
#include "llvm/Pass.h"
|
|
|
|
namespace llvm {
|
|
|
|
struct UnifyFunctionExitNodes : public FunctionPass {
|
|
BasicBlock *ReturnBlock, *UnwindBlock, *UnreachableBlock;
|
|
public:
|
|
UnifyFunctionExitNodes() : ReturnBlock(0), UnwindBlock(0) {}
|
|
|
|
// We can preserve non-critical-edgeness when we unify function exit nodes
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
|
|
|
|
// getReturn|Unwind|UnreachableBlock - Return the new single (or nonexistant)
|
|
// return, unwind, or unreachable basic blocks in the CFG.
|
|
//
|
|
BasicBlock *getReturnBlock() const { return ReturnBlock; }
|
|
BasicBlock *getUnwindBlock() const { return UnwindBlock; }
|
|
BasicBlock *getUnreachableBlock() const { return UnreachableBlock; }
|
|
|
|
virtual bool runOnFunction(Function &F);
|
|
};
|
|
|
|
Pass *createUnifyFunctionExitNodesPass();
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|