Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/include/llvm/Transforms/Utils/UnifyFunctionExitNodes.h
Line
Count
Source (jump to first uncovered line)
1
//===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- C++ -*-===//
2
//
3
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4
// See https://llvm.org/LICENSE.txt for license information.
5
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6
//
7
//===----------------------------------------------------------------------===//
8
//
9
// This pass is used to ensure that functions have at most one return and one
10
// unwind instruction in them.  Additionally, it keeps track of which node is
11
// the new exit node of the CFG.  If there are no return or unwind instructions
12
// in the function, the getReturnBlock/getUnwindBlock methods will return a null
13
// pointer.
14
//
15
//===----------------------------------------------------------------------===//
16
17
#ifndef LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
18
#define LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
19
20
#include "llvm/Pass.h"
21
#include "llvm/PassRegistry.h"
22
23
namespace llvm {
24
25
struct UnifyFunctionExitNodes : public FunctionPass {
26
  BasicBlock *ReturnBlock = nullptr;
27
  BasicBlock *UnwindBlock = nullptr;
28
  BasicBlock *UnreachableBlock;
29
30
public:
31
  static char ID; // Pass identification, replacement for typeid
32
0
  UnifyFunctionExitNodes() : FunctionPass(ID) {
33
0
    initializeUnifyFunctionExitNodesPass(*PassRegistry::getPassRegistry());
34
0
  }
35
36
  // We can preserve non-critical-edgeness when we unify function exit nodes
37
  void getAnalysisUsage(AnalysisUsage &AU) const override;
38
39
  // getReturn|Unwind|UnreachableBlock - Return the new single (or nonexistent)
40
  // return, unwind, or unreachable  basic blocks in the CFG.
41
  //
42
0
  BasicBlock *getReturnBlock() const { return ReturnBlock; }
43
0
  BasicBlock *getUnwindBlock() const { return UnwindBlock; }
44
0
  BasicBlock *getUnreachableBlock() const { return UnreachableBlock; }
45
46
  bool runOnFunction(Function &F) override;
47
};
48
49
Pass *createUnifyFunctionExitNodesPass();
50
51
} // end namespace llvm
52
53
#endif // LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H