| //===- 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; |
| } |