1edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek//===- PostOrderCFGView.cpp - Post order view of CFG blocks -------*- C++ --*-// 2edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// 3edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// The LLVM Compiler Infrastructure 4edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// 5edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// This file is distributed under the University of Illinois Open Source 6edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// License. See LICENSE.TXT for details. 7edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// 8edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek//===----------------------------------------------------------------------===// 9edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// 10edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// This file implements post order view of the blocks in a CFG. 11edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek// 12edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek//===----------------------------------------------------------------------===// 13edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 14edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek#include "clang/Analysis/Analyses/PostOrderCFGView.h" 15edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 16edb186399e19d84c93f25440435ab9a695138e79Ted Kremenekusing namespace clang; 17edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 1899ba9e3bd70671f3441fb974895f226a83ce0e66David Blaikievoid PostOrderCFGView::anchor() { } 1999ba9e3bd70671f3441fb974895f226a83ce0e66David Blaikie 20edb186399e19d84c93f25440435ab9a695138e79Ted KremenekPostOrderCFGView::PostOrderCFGView(const CFG *cfg) { 21edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek Blocks.reserve(cfg->getNumBlockIDs()); 22edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek CFGBlockSet BSet(cfg); 23edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 24edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek for (po_iterator I = po_iterator::begin(cfg, BSet), 25edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek E = po_iterator::end(cfg, BSet); I != E; ++I) { 26edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek BlockOrder[*I] = Blocks.size() + 1; 27edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek Blocks.push_back(*I); 28edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek } 29edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek} 30edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 311d26f48dc2eea1c07431ca1519d7034a21b9bcffTed KremenekPostOrderCFGView *PostOrderCFGView::create(AnalysisDeclContext &ctx) { 32edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek const CFG *cfg = ctx.getCFG(); 33edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek if (!cfg) 346bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89Stephen Hines return nullptr; 35edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek return new PostOrderCFGView(cfg); 36edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek} 37edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 38edb186399e19d84c93f25440435ab9a695138e79Ted Kremenekconst void *PostOrderCFGView::getTag() { static int x; return &x; } 39edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 40edb186399e19d84c93f25440435ab9a695138e79Ted Kremenekbool PostOrderCFGView::BlockOrderCompare::operator()(const CFGBlock *b1, 41edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek const CFGBlock *b2) const { 42edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1); 43edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2); 44edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 45edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second; 46edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second; 47edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek return b1V > b2V; 48edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek} 49edb186399e19d84c93f25440435ab9a695138e79Ted Kremenek 50