Ted Kremenek | edb1863 | 2011-10-22 02:14:23 +0000 | [diff] [blame^] | 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 | PostOrderCFGView::PostOrderCFGView(const CFG *cfg) { |
| 19 | Blocks.reserve(cfg->getNumBlockIDs()); |
| 20 | CFGBlockSet BSet(cfg); |
| 21 | |
| 22 | for (po_iterator I = po_iterator::begin(cfg, BSet), |
| 23 | E = po_iterator::end(cfg, BSet); I != E; ++I) { |
| 24 | BlockOrder[*I] = Blocks.size() + 1; |
| 25 | Blocks.push_back(*I); |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | PostOrderCFGView *PostOrderCFGView::create(AnalysisContext &ctx) { |
| 30 | const CFG *cfg = ctx.getCFG(); |
| 31 | if (!cfg) |
| 32 | return 0; |
| 33 | return new PostOrderCFGView(cfg); |
| 34 | } |
| 35 | |
| 36 | const void *PostOrderCFGView::getTag() { static int x; return &x; } |
| 37 | |
| 38 | bool PostOrderCFGView::BlockOrderCompare::operator()(const CFGBlock *b1, |
| 39 | const CFGBlock *b2) const { |
| 40 | PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1); |
| 41 | PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2); |
| 42 | |
| 43 | unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second; |
| 44 | unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second; |
| 45 | return b1V > b2V; |
| 46 | } |
| 47 | |