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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
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//==- RegisterUsageInfo.h - Register Usage Informartion Storage --*- 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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/// \file
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/// This pass is required to take advantage of the interprocedural register
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/// allocation infrastructure.
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///
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/// This pass is simple immutable pass which keeps RegMasks (calculated based on
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/// actual register allocation) for functions in a module and provides simple
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/// API to query this information.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_PHYSICALREGISTERUSAGEINFO_H
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#define LLVM_CODEGEN_PHYSICALREGISTERUSAGEINFO_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include <cstdint>
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#include <vector>
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namespace llvm {
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class Function;
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class LLVMTargetMachine;
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class PhysicalRegisterUsageInfo : public ImmutablePass {
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public:
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static char ID;
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PhysicalRegisterUsageInfo() : ImmutablePass(ID) {
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PassRegistry &Registry = *PassRegistry::getPassRegistry();
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initializePhysicalRegisterUsageInfoPass(Registry);
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}
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/// Set TargetMachine which is used to print analysis.
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void setTargetMachine(const LLVMTargetMachine &TM);
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bool doInitialization(Module &M) override;
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bool doFinalization(Module &M) override;
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/// To store RegMask for given Function *.
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void storeUpdateRegUsageInfo(const Function &FP,
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ArrayRef<uint32_t> RegMask);
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/// To query stored RegMask for given Function *, it will returns ane empty
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/// array if function is not known.
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ArrayRef<uint32_t> getRegUsageInfo(const Function &FP);
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void print(raw_ostream &OS, const Module *M = nullptr) const override;
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private:
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/// A Dense map from Function * to RegMask.
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/// In RegMask 0 means register used (clobbered) by function.
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/// and 1 means content of register will be preserved around function call.
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DenseMap<const Function *, std::vector<uint32_t>> RegMasks;
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const LLVMTargetMachine *TM;
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_PHYSICALREGISTERUSAGEINFO_H
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