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This file lists every pass in LLVM, and is included by Pass.h, which is very popular. Every time we add, remove, or rename a pass in LLVM, it caused lots of recompilation. I found this fact by looking at this table, which is sorted by the number of times a file was changed over the last 100,000 git commits multiplied by the number of object files that depend on it in the current checkout: recompiles touches affected_files header 342380 95 3604 llvm/include/llvm/ADT/STLExtras.h 314730 234 1345 llvm/include/llvm/InitializePasses.h 307036 118 2602 llvm/include/llvm/ADT/APInt.h 213049 59 3611 llvm/include/llvm/Support/MathExtras.h 170422 47 3626 llvm/include/llvm/Support/Compiler.h 162225 45 3605 llvm/include/llvm/ADT/Optional.h 158319 63 2513 llvm/include/llvm/ADT/Triple.h 140322 39 3598 llvm/include/llvm/ADT/StringRef.h 137647 59 2333 llvm/include/llvm/Support/Error.h 131619 73 1803 llvm/include/llvm/Support/FileSystem.h Before this change, touching InitializePasses.h would cause 1345 files to recompile. After this change, touching it only causes 550 compiles in an incremental rebuild. Reviewers: bkramer, asbirlea, bollu, jdoerfert Differential Revision: https://reviews.llvm.org/D70211
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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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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_UTILS_UNIFYFUNCTIONEXITNODES_H
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#define LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
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#include "llvm/Pass.h"
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#include "llvm/PassRegistry.h"
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namespace llvm {
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struct UnifyFunctionExitNodes : public FunctionPass {
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BasicBlock *ReturnBlock = nullptr;
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BasicBlock *UnwindBlock = nullptr;
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BasicBlock *UnreachableBlock;
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public:
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static char ID; // Pass identification, replacement for typeid
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UnifyFunctionExitNodes();
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// We can preserve non-critical-edgeness when we unify function exit nodes
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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// getReturn|Unwind|UnreachableBlock - Return the new single (or nonexistent)
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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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bool runOnFunction(Function &F) override;
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};
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Pass *createUnifyFunctionExitNodesPass();
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
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