51 lines · cpp
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-exception6//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 32std::unique_ptr<PostOrderCFGView>33PostOrderCFGView::create(AnalysisDeclContext &ctx) {34 const CFG *cfg = ctx.getCFG();35 if (!cfg)36 return nullptr;37 return std::make_unique<PostOrderCFGView>(cfg);38}39 40const void *PostOrderCFGView::getTag() { static int x; return &x; }41 42bool PostOrderCFGView::BlockOrderCompare::operator()(const CFGBlock *b1,43 const CFGBlock *b2) const {44 PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1);45 PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2);46 47 unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second;48 unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second;49 return b1V > b2V;50}51