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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
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
//===- StripNonLineTableDebugInfo.cpp -- Strip parts of Debug Info --------===//
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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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#include "llvm/IR/DebugInfo.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include "llvm/Transforms/Utils.h"
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using namespace llvm;
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namespace {
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/// This pass strips all debug info that is not related line tables.
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/// The result will be the same as if the program where compiled with
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/// -gline-tables-only.
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struct StripNonLineTableDebugInfo : public ModulePass {
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static char ID; // Pass identification, replacement for typeid
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StripNonLineTableDebugInfo() : ModulePass(ID) {
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initializeStripNonLineTableDebugInfoPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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bool runOnModule(Module &M) override {
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return llvm::stripNonLineTableDebugInfo(M);
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}
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};
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}
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char StripNonLineTableDebugInfo::ID = 0;
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INITIALIZE_PASS(StripNonLineTableDebugInfo, "strip-nonlinetable-debuginfo",
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"Strip all debug info except linetables", false, false)
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ModulePass *llvm::createStripNonLineTableDebugInfoPass() {
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return new StripNonLineTableDebugInfo();
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}
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