blob: 3e7afd4cd4337181be1595a2fb85d6322ceb18d2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
//===-- UnreachableBlockElim.h - Remove unreachable blocks for codegen --===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass is an extremely simple version of the SimplifyCFG pass. Its sole
// job is to delete LLVM basic blocks that are not reachable from the entry
// node. To do this, it performs a simple depth first traversal of the CFG,
// then deletes any unvisited nodes.
//
// Note that this pass is really a hack. In particular, the instruction
// selectors for various targets should just not generate code for unreachable
// blocks. Until LLVM has a more systematic way of defining instruction
// selectors, however, we cannot really expect them to handle additional
// complexity.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_UNREACHABLEBLOCKELIM_H
#define LLVM_LIB_CODEGEN_UNREACHABLEBLOCKELIM_H
#include "llvm/IR/PassManager.h"
namespace llvm {
class UnreachableBlockElimPass
: public PassInfoMixin<UnreachableBlockElimPass> {
public:
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
};
} // end namespace llvm
#endif // LLVM_LIB_CODEGEN_UNREACHABLEBLOCKELIM_H
|
