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531a8d8a72
a function's CFG when that CFG is unchanged. This allows transformation passes to simply claim they preserve the CFG and analysis passes to check for the CFG being preserved to remove the fanout of all analyses being listed in all passes. I've gone through and removed or cleaned up as many of the comments reminding us to do this as I could. Differential Revision: https://reviews.llvm.org/D28627 llvm-svn: 292054
75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
//===- PostDominators.cpp - Post-Dominator Calculation --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the post-dominator construction algorithms.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/PostDominators.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SetOperations.h"
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#include "llvm/IR/CFG.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/GenericDomTreeConstruction.h"
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using namespace llvm;
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#define DEBUG_TYPE "postdomtree"
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//===----------------------------------------------------------------------===//
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// PostDominatorTree Implementation
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//===----------------------------------------------------------------------===//
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char PostDominatorTreeWrapperPass::ID = 0;
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INITIALIZE_PASS(PostDominatorTreeWrapperPass, "postdomtree",
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"Post-Dominator Tree Construction", true, true)
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bool PostDominatorTree::invalidate(Function &F, const PreservedAnalyses &PA,
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FunctionAnalysisManager::Invalidator &) {
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// Check whether the analysis, all analyses on functions, or the function's
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// CFG have been preserved.
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auto PAC = PA.getChecker<PostDominatorTreeAnalysis>();
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return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
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PAC.preservedSet<CFGAnalyses>());
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}
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bool PostDominatorTreeWrapperPass::runOnFunction(Function &F) {
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DT.recalculate(F);
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return false;
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}
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void PostDominatorTreeWrapperPass::print(raw_ostream &OS, const Module *) const {
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DT.print(OS);
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}
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FunctionPass* llvm::createPostDomTree() {
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return new PostDominatorTreeWrapperPass();
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}
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AnalysisKey PostDominatorTreeAnalysis::Key;
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PostDominatorTree PostDominatorTreeAnalysis::run(Function &F,
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FunctionAnalysisManager &) {
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PostDominatorTree PDT;
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PDT.recalculate(F);
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return PDT;
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}
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PostDominatorTreePrinterPass::PostDominatorTreePrinterPass(raw_ostream &OS)
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: OS(OS) {}
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PreservedAnalyses
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PostDominatorTreePrinterPass::run(Function &F, FunctionAnalysisManager &AM) {
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OS << "PostDominatorTree for function: " << F.getName() << "\n";
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AM.getResult<PostDominatorTreeAnalysis>(F).print(OS);
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return PreservedAnalyses::all();
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}
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