1//===- PostOrderCFGView.cpp - Post order view of CFG blocks ---------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file implements post order view of the blocks in a CFG. 10// 11//===----------------------------------------------------------------------===// 12 13#include "clang/Analysis/Analyses/PostOrderCFGView.h" 14#include "clang/Analysis/AnalysisDeclContext.h" 15#include "clang/Analysis/CFG.h" 16 17using namespace clang; 18 19void PostOrderCFGView::anchor() {} 20 21PostOrderCFGView::PostOrderCFGView(const CFG *cfg) { 22 Blocks.reserve(cfg->getNumBlockIDs()); 23 CFGBlockSet BSet(cfg); 24 25 for (po_iterator I = po_iterator::begin(cfg, BSet), 26 E = po_iterator::end(cfg, BSet); I != E; ++I) { 27 BlockOrder[*I] = Blocks.size() + 1; 28 Blocks.push_back(*I); 29 } 30} 31 32PostOrderCFGView *PostOrderCFGView::create(AnalysisDeclContext &ctx) { 33 const CFG *cfg = ctx.getCFG(); 34 if (!cfg) 35 return nullptr; 36 return new PostOrderCFGView(cfg); 37} 38 39const void *PostOrderCFGView::getTag() { static int x; return &x; } 40 41bool PostOrderCFGView::BlockOrderCompare::operator()(const CFGBlock *b1, 42 const CFGBlock *b2) const { 43 PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1); 44 PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2); 45 46 unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second; 47 unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second; 48 return b1V > b2V; 49} 50