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 //===----------------------------------------------------------------------===//
  27 //  PostDominatorTree Implementation
  28 //===----------------------------------------------------------------------===//
  29
  30 char PostDominatorTreeWrapperPass::ID = 0;
  31 INITIALIZE_PASS(PostDominatorTreeWrapperPass, "postdomtree",
  32                 "Post-Dominator Tree Construction", true, true)
  33
  34 bool PostDominatorTree::invalidate(Function &F, const PreservedAnalyses &PA,
  35                                    FunctionAnalysisManager::Invalidator &) {
  36   // Check whether the analysis, all analyses on functions, or the function's
  37   // CFG have been preserved.
  38   auto PAC = PA.getChecker<PostDominatorTreeAnalysis>();
  39   return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
  40            PAC.preservedSet<CFGAnalyses>());
  41 }
  42
  43 bool PostDominatorTreeWrapperPass::runOnFunction(Function &F) {
  44   DT.recalculate(F);
  45   return false;
  46 }
  47
  48 void PostDominatorTreeWrapperPass::print(raw_ostream &OS, const Module *) const {
  49   DT.print(OS);
  50 }
  51
  52 FunctionPass* llvm::createPostDomTree() {
  53   return new PostDominatorTreeWrapperPass();
  54 }
  55
  56 AnalysisKey PostDominatorTreeAnalysis::Key;
  57
  58 PostDominatorTree PostDominatorTreeAnalysis::run(Function &F,
  59                                                  FunctionAnalysisManager &) {
  60   PostDominatorTree PDT;
  61   PDT.recalculate(F);
  62   return PDT;
  63 }
  64
  65 PostDominatorTreePrinterPass::PostDominatorTreePrinterPass(raw_ostream &OS)
  66   : OS(OS) {}
  67
  68 PreservedAnalyses
  69 PostDominatorTreePrinterPass::run(Function &F, FunctionAnalysisManager &AM) {
  70   OS << "PostDominatorTree for function: " << F.getName() << "\n";
  71   AM.getResult<PostDominatorTreeAnalysis>(F).print(OS);
  72
  73   return PreservedAnalyses::all();
  74 }