clang 17.0.0git
PostOrderCFGView.cpp
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1//===- PostOrderCFGView.cpp - Post order view of CFG blocks ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements post order view of the blocks in a CFG.
10//
11//===----------------------------------------------------------------------===//
12
15#include "clang/Analysis/CFG.h"
16
17using namespace clang;
18
19void PostOrderCFGView::anchor() {}
20
22 Blocks.reserve(cfg->getNumBlockIDs());
23 CFGBlockSet BSet(cfg);
24
25 for (po_iterator I = po_iterator::begin(cfg, BSet),
26 E = po_iterator::end(cfg, BSet); I != E; ++I) {
27 BlockOrder[*I] = Blocks.size() + 1;
28 Blocks.push_back(*I);
29 }
30}
31
32std::unique_ptr<PostOrderCFGView>
34 const CFG *cfg = ctx.getCFG();
35 if (!cfg)
36 return nullptr;
37 return std::make_unique<PostOrderCFGView>(cfg);
38}
39
40const void *PostOrderCFGView::getTag() { static int x; return &x; }
41
43 const CFGBlock *b2) const {
44 PostOrderCFGView::BlockOrderTy::const_iterator b1It = POV.BlockOrder.find(b1);
45 PostOrderCFGView::BlockOrderTy::const_iterator b2It = POV.BlockOrder.find(b2);
46
47 unsigned b1V = (b1It == POV.BlockOrder.end()) ? 0 : b1It->second;
48 unsigned b2V = (b2It == POV.BlockOrder.end()) ? 0 : b2It->second;
49 return b1V > b2V;
50}
This file defines AnalysisDeclContext, a class that manages the analysis context data for context sen...
AnalysisDeclContext contains the context data for the function, method or block under analysis.
Represents a single basic block in a source-level CFG.
Definition: CFG.h:576
Represents a source-level, intra-procedural CFG that represents the control-flow of a Stmt.
Definition: CFG.h:1225
unsigned getNumBlockIDs() const
Returns the total number of BlockIDs allocated (which start at 0).
Definition: CFG.h:1411
Implements a set of CFGBlocks using a BitVector.
PostOrderCFGView(const CFG *cfg)
static std::unique_ptr< PostOrderCFGView > create(AnalysisDeclContext &analysisContext)
static const void * getTag()
bool operator()(const CFGBlock *b1, const CFGBlock *b2) const