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51 lines
1.7 KiB
51 lines
1.7 KiB
4 months ago
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//===- PostOrderCFGView.cpp - Post order view of CFG blocks ---------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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#include "clang/Analysis/AnalysisDeclContext.h"
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#include "clang/Analysis/CFG.h"
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using namespace clang;
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void PostOrderCFGView::anchor() {}
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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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std::unique_ptr<PostOrderCFGView>
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PostOrderCFGView::create(AnalysisDeclContext &ctx) {
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const CFG *cfg = ctx.getCFG();
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if (!cfg)
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return nullptr;
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return std::make_unique<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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