1 //===- PostOrderCFGView.cpp - Post order view of CFG blocks -------*- C++ --*-// 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 post order view of the blocks in a CFG. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Analysis/Analyses/PostOrderCFGView.h" 15 16 using namespace clang; 17 18 void PostOrderCFGView::anchor() { } 19 20 PostOrderCFGView::PostOrderCFGView(const CFG *cfg) { 21 Blocks.reserve(cfg->getNumBlockIDs()); 22 CFGBlockSet BSet(cfg); 23 24 for (po_iterator I = po_iterator::begin(cfg, BSet), 25 E = po_iterator::end(cfg, BSet); I != E; ++I) { 26 BlockOrder[*I] = Blocks.size() + 1; 27 Blocks.push_back(*I); 28 } 29 } 30 31 PostOrderCFGView *PostOrderCFGView::create(AnalysisDeclContext &ctx) { 32 const CFG *cfg = ctx.getCFG(); 33 if (!cfg) 34 return nullptr; 35 return new PostOrderCFGView(cfg); 36 } 37 38 const void *PostOrderCFGView::getTag() { static int x; return &x; } 39 40 bool PostOrderCFGView::BlockOrderCompare::operator()(const CFGBlock *b1, 41 const CFGBlock *b2) const { 42 PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1); 43 PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2); 44 45 unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second; 46 unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second; 47 return b1V > b2V; 48 } 49 50
