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 16using namespace clang; 17 18void PostOrderCFGView::anchor() { } 19 20PostOrderCFGView::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 31PostOrderCFGView *PostOrderCFGView::create(AnalysisDeclContext &ctx) { 32 const CFG *cfg = ctx.getCFG(); 33 if (!cfg) 34 return 0; 35 return new PostOrderCFGView(cfg); 36} 37 38const void *PostOrderCFGView::getTag() { static int x; return &x; } 39 40bool 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