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//===- PostOrderCFGView.cpp - Post order view of CFG blocks ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements post order view of the blocks in a CFG.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/Analyses/PostOrderCFGView.h"
#include "clang/Analysis/AnalysisDeclContext.h"
#include "clang/Analysis/CFG.h"
using namespace clang;
void PostOrderCFGView::anchor() {}
PostOrderCFGView::PostOrderCFGView(const CFG *cfg) {
Blocks.reserve(cfg->getNumBlockIDs());
CFGBlockSet BSet(cfg);
for (po_iterator I = po_iterator::begin(cfg, BSet),
E = po_iterator::end(cfg, BSet); I != E; ++I) {
BlockOrder[*I] = Blocks.size() + 1;
Blocks.push_back(*I);
}
}
std::unique_ptr<PostOrderCFGView>
PostOrderCFGView::create(AnalysisDeclContext &ctx) {
const CFG *cfg = ctx.getCFG();
if (!cfg)
return nullptr;
return std::make_unique<PostOrderCFGView>(cfg);
}
const void *PostOrderCFGView::getTag() { static int x; return &x; }
bool PostOrderCFGView::BlockOrderCompare::operator()(const CFGBlock *b1,
const CFGBlock *b2) const {
PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1);
PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2);
unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second;
unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second;
return b1V > b2V;
}
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