contrib/llvm/lib/Analysis/PostDominators.cpp

   1 //===- PostDominators.cpp - Post-Dominator Calculation --------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the post-dominator construction algorithms.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Analysis/PostDominators.h"
  15 #include "llvm/ADT/DepthFirstIterator.h"
  16 #include "llvm/ADT/SetOperations.h"
  17 #include "llvm/IR/CFG.h"
  18 #include "llvm/IR/Instructions.h"
  19 #include "llvm/IR/PassManager.h"
  20 #include "llvm/Support/Debug.h"
  21 #include "llvm/Support/GenericDomTreeConstruction.h"
  22 using namespace llvm;
  23
  24 #define DEBUG_TYPE "postdomtree"
  25
  26 template class llvm::DominatorTreeBase<BasicBlock, true>; // PostDomTreeBase
  27
  28 //===----------------------------------------------------------------------===//
  29 //  PostDominatorTree Implementation
  30 //===----------------------------------------------------------------------===//
  31
  32 char PostDominatorTreeWrapperPass::ID = 0;
  33 INITIALIZE_PASS(PostDominatorTreeWrapperPass, "postdomtree",
  34                 "Post-Dominator Tree Construction", true, true)
  35
  36 bool PostDominatorTree::invalidate(Function &F, const PreservedAnalyses &PA,
  37                                    FunctionAnalysisManager::Invalidator &) {
  38   // Check whether the analysis, all analyses on functions, or the function's
  39   // CFG have been preserved.
  40   auto PAC = PA.getChecker<PostDominatorTreeAnalysis>();
  41   return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
  42            PAC.preservedSet<CFGAnalyses>());
  43 }
  44
  45 bool PostDominatorTreeWrapperPass::runOnFunction(Function &F) {
  46   DT.recalculate(F);
  47   return false;
  48 }
  49
  50 void PostDominatorTreeWrapperPass::print(raw_ostream &OS, const Module *) const {
  51   DT.print(OS);
  52 }
  53
  54 FunctionPass* llvm::createPostDomTree() {
  55   return new PostDominatorTreeWrapperPass();
  56 }
  57
  58 AnalysisKey PostDominatorTreeAnalysis::Key;
  59
  60 PostDominatorTree PostDominatorTreeAnalysis::run(Function &F,
  61                                                  FunctionAnalysisManager &) {
  62   PostDominatorTree PDT;
  63   PDT.recalculate(F);
  64   return PDT;
  65 }
  66
  67 PostDominatorTreePrinterPass::PostDominatorTreePrinterPass(raw_ostream &OS)
  68   : OS(OS) {}
  69
  70 PreservedAnalyses
  71 PostDominatorTreePrinterPass::run(Function &F, FunctionAnalysisManager &AM) {
  72   OS << "PostDominatorTree for function: " << F.getName() << "\n";
  73   AM.getResult<PostDominatorTreeAnalysis>(F).print(OS);
  74
  75   return PreservedAnalyses::all();
  76 }