2015-02-06 09:46:42 +08:00
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//===- MemDerefPrinter.cpp - Printer for isDereferenceablePointer ---------===//
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//
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2019-01-19 16:50:56 +08:00
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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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2015-02-06 09:46:42 +08:00
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//
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//===----------------------------------------------------------------------===//
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2016-02-24 20:49:04 +08:00
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#include "llvm/Analysis/Loads.h"
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2017-06-06 19:49:48 +08:00
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#include "llvm/Analysis/Passes.h"
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2015-02-06 09:46:42 +08:00
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#include "llvm/IR/CallSite.h"
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2015-02-10 05:50:03 +08:00
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#include "llvm/IR/DataLayout.h"
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2015-02-06 09:46:42 +08:00
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/LLVMContext.h"
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2015-03-05 02:43:29 +08:00
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#include "llvm/IR/Module.h"
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Sink all InitializePasses.h includes
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
2019-11-14 05:15:01 +08:00
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#include "llvm/InitializePasses.h"
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2015-02-06 09:46:42 +08:00
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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struct MemDerefPrinter : public FunctionPass {
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2015-08-17 23:54:26 +08:00
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SmallVector<Value *, 4> Deref;
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SmallPtrSet<Value *, 4> DerefAndAligned;
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2015-02-06 09:46:42 +08:00
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2015-05-21 19:57:38 +08:00
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static char ID; // Pass identification, replacement for typeid
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2015-02-06 09:46:42 +08:00
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MemDerefPrinter() : FunctionPass(ID) {
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initializeMemDerefPrinterPass(*PassRegistry::getPassRegistry());
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}
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2015-02-10 05:50:03 +08:00
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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2015-02-06 09:46:42 +08:00
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bool runOnFunction(Function &F) override;
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void print(raw_ostream &OS, const Module * = nullptr) const override;
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void releaseMemory() override {
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2015-08-17 23:54:26 +08:00
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Deref.clear();
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DerefAndAligned.clear();
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2015-02-06 09:46:42 +08:00
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}
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};
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2015-06-23 17:49:53 +08:00
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}
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2015-02-06 09:46:42 +08:00
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char MemDerefPrinter::ID = 0;
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2015-02-10 05:50:03 +08:00
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INITIALIZE_PASS_BEGIN(MemDerefPrinter, "print-memderefs",
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"Memory Dereferenciblity of pointers in function", false, true)
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INITIALIZE_PASS_END(MemDerefPrinter, "print-memderefs",
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"Memory Dereferenciblity of pointers in function", false, true)
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2015-02-06 09:46:42 +08:00
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FunctionPass *llvm::createMemDerefPrinter() {
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return new MemDerefPrinter();
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}
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bool MemDerefPrinter::runOnFunction(Function &F) {
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2015-03-05 02:43:29 +08:00
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const DataLayout &DL = F.getParent()->getDataLayout();
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2015-08-07 03:10:45 +08:00
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for (auto &I: instructions(F)) {
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2015-02-06 09:46:42 +08:00
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if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
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Value *PO = LI->getPointerOperand();
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2019-07-09 19:35:35 +08:00
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if (isDereferenceablePointer(PO, LI->getType(), DL))
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2015-08-17 23:54:26 +08:00
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Deref.push_back(PO);
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2019-10-21 23:10:26 +08:00
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if (isDereferenceableAndAlignedPointer(
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PO, LI->getType(), MaybeAlign(LI->getAlignment()), DL))
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2015-08-17 23:54:26 +08:00
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DerefAndAligned.insert(PO);
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2015-02-06 09:46:42 +08:00
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}
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}
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return false;
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}
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void MemDerefPrinter::print(raw_ostream &OS, const Module *M) const {
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OS << "The following are dereferenceable:\n";
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2015-08-17 23:54:26 +08:00
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for (Value *V: Deref) {
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2015-02-06 09:46:42 +08:00
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V->print(OS);
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2015-08-17 23:54:26 +08:00
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if (DerefAndAligned.count(V))
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OS << "\t(aligned)";
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else
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OS << "\t(unaligned)";
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2015-02-06 09:46:42 +08:00
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OS << "\n\n";
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}
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}
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