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05da2fe521
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
121 lines
3.3 KiB
C++
121 lines
3.3 KiB
C++
//===- NameAnonGlobals.cpp - ThinLTO Support: Name Unnamed Globals --------===//
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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 file implements naming anonymous globals to make sure they can be
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// referred to by ThinLTO.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/NameAnonGlobals.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Support/MD5.h"
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#include "llvm/Transforms/Utils/ModuleUtils.h"
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using namespace llvm;
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namespace {
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// Compute a "unique" hash for the module based on the name of the public
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// globals.
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class ModuleHasher {
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Module &TheModule;
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std::string TheHash;
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public:
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ModuleHasher(Module &M) : TheModule(M) {}
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/// Return the lazily computed hash.
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std::string &get() {
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if (!TheHash.empty())
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// Cache hit :)
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return TheHash;
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MD5 Hasher;
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for (auto &F : TheModule) {
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if (F.isDeclaration() || F.hasLocalLinkage() || !F.hasName())
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continue;
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auto Name = F.getName();
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Hasher.update(Name);
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}
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for (auto &GV : TheModule.globals()) {
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if (GV.isDeclaration() || GV.hasLocalLinkage() || !GV.hasName())
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continue;
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auto Name = GV.getName();
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Hasher.update(Name);
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}
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// Now return the result.
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MD5::MD5Result Hash;
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Hasher.final(Hash);
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SmallString<32> Result;
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MD5::stringifyResult(Hash, Result);
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TheHash = Result.str();
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return TheHash;
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}
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};
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} // end anonymous namespace
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// Rename all the anon globals in the module
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bool llvm::nameUnamedGlobals(Module &M) {
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bool Changed = false;
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ModuleHasher ModuleHash(M);
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int count = 0;
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auto RenameIfNeed = [&](GlobalValue &GV) {
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if (GV.hasName())
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return;
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GV.setName(Twine("anon.") + ModuleHash.get() + "." + Twine(count++));
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Changed = true;
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};
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for (auto &GO : M.global_objects())
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RenameIfNeed(GO);
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for (auto &GA : M.aliases())
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RenameIfNeed(GA);
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return Changed;
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}
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namespace {
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// Legacy pass that provides a name to every anon globals.
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class NameAnonGlobalLegacyPass : public ModulePass {
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public:
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/// Pass identification, replacement for typeid
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static char ID;
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/// Specify pass name for debug output
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StringRef getPassName() const override { return "Name Anon Globals"; }
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explicit NameAnonGlobalLegacyPass() : ModulePass(ID) {}
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bool runOnModule(Module &M) override { return nameUnamedGlobals(M); }
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};
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char NameAnonGlobalLegacyPass::ID = 0;
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} // anonymous namespace
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PreservedAnalyses NameAnonGlobalPass::run(Module &M,
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ModuleAnalysisManager &AM) {
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if (!nameUnamedGlobals(M))
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return PreservedAnalyses::all();
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return PreservedAnalyses::none();
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}
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INITIALIZE_PASS_BEGIN(NameAnonGlobalLegacyPass, "name-anon-globals",
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"Provide a name to nameless globals", false, false)
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INITIALIZE_PASS_END(NameAnonGlobalLegacyPass, "name-anon-globals",
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"Provide a name to nameless globals", false, false)
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namespace llvm {
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ModulePass *createNameAnonGlobalPass() {
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return new NameAnonGlobalLegacyPass();
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}
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}
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