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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
131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
//===- ObjCARCExpand.cpp - ObjC ARC Optimization --------------------------===//
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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 file defines ObjC ARC optimizations. ARC stands for Automatic
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/// Reference Counting and is a system for managing reference counts for objects
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/// in Objective C.
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///
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/// This specific file deals with early optimizations which perform certain
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/// cleanup operations.
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///
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/// WARNING: This file knows about certain library functions. It recognizes them
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/// by name, and hardwires knowledge of their semantics.
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///
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/// WARNING: This file knows about how certain Objective-C library functions are
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/// used. Naive LLVM IR transformations which would otherwise be
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/// behavior-preserving may break these assumptions.
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///
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//===----------------------------------------------------------------------===//
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#include "ObjCARC.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Value.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include "llvm/PassAnalysisSupport.h"
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#include "llvm/PassRegistry.h"
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#include "llvm/PassSupport.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#define DEBUG_TYPE "objc-arc-expand"
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namespace llvm {
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class Module;
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}
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using namespace llvm;
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using namespace llvm::objcarc;
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namespace {
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/// Early ARC transformations.
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class ObjCARCExpand : public FunctionPass {
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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bool doInitialization(Module &M) override;
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bool runOnFunction(Function &F) override;
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/// A flag indicating whether this optimization pass should run.
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bool Run;
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public:
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static char ID;
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ObjCARCExpand() : FunctionPass(ID) {
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initializeObjCARCExpandPass(*PassRegistry::getPassRegistry());
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}
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};
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}
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char ObjCARCExpand::ID = 0;
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INITIALIZE_PASS(ObjCARCExpand,
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"objc-arc-expand", "ObjC ARC expansion", false, false)
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Pass *llvm::createObjCARCExpandPass() {
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return new ObjCARCExpand();
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}
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void ObjCARCExpand::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesCFG();
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}
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bool ObjCARCExpand::doInitialization(Module &M) {
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Run = ModuleHasARC(M);
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return false;
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}
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bool ObjCARCExpand::runOnFunction(Function &F) {
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if (!EnableARCOpts)
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return false;
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// If nothing in the Module uses ARC, don't do anything.
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if (!Run)
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return false;
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bool Changed = false;
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LLVM_DEBUG(dbgs() << "ObjCARCExpand: Visiting Function: " << F.getName()
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<< "\n");
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for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
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Instruction *Inst = &*I;
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LLVM_DEBUG(dbgs() << "ObjCARCExpand: Visiting: " << *Inst << "\n");
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switch (GetBasicARCInstKind(Inst)) {
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case ARCInstKind::Retain:
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case ARCInstKind::RetainRV:
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case ARCInstKind::Autorelease:
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case ARCInstKind::AutoreleaseRV:
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case ARCInstKind::FusedRetainAutorelease:
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case ARCInstKind::FusedRetainAutoreleaseRV: {
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// These calls return their argument verbatim, as a low-level
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// optimization. However, this makes high-level optimizations
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// harder. Undo any uses of this optimization that the front-end
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// emitted here. We'll redo them in the contract pass.
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Changed = true;
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Value *Value = cast<CallInst>(Inst)->getArgOperand(0);
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LLVM_DEBUG(dbgs() << "ObjCARCExpand: Old = " << *Inst
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<< "\n"
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" New = "
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<< *Value << "\n");
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Inst->replaceAllUsesWith(Value);
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break;
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}
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default:
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break;
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}
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}
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LLVM_DEBUG(dbgs() << "ObjCARCExpand: Finished List.\n\n");
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return Changed;
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}
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