forked from OSchip/llvm-project
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
//===- PostOrderCFGView.cpp - Post order view of CFG blocks -------*- C++ --*-//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements post order view of the blocks in a CFG.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/Analyses/PostOrderCFGView.h"
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using namespace clang;
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PostOrderCFGView::PostOrderCFGView(const CFG *cfg) {
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Blocks.reserve(cfg->getNumBlockIDs());
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CFGBlockSet BSet(cfg);
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for (po_iterator I = po_iterator::begin(cfg, BSet),
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E = po_iterator::end(cfg, BSet); I != E; ++I) {
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BlockOrder[*I] = Blocks.size() + 1;
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Blocks.push_back(*I);
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}
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}
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PostOrderCFGView *PostOrderCFGView::create(AnalysisDeclContext &ctx) {
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const CFG *cfg = ctx.getCFG();
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if (!cfg)
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return 0;
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return new PostOrderCFGView(cfg);
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}
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const void *PostOrderCFGView::getTag() { static int x; return &x; }
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bool PostOrderCFGView::BlockOrderCompare::operator()(const CFGBlock *b1,
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const CFGBlock *b2) const {
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PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1);
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PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2);
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unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second;
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unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second;
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return b1V > b2V;
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}
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