2002-08-03 00:43:03 +08:00
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//===- PostDominators.cpp - Post-Dominator Calculation --------------------===//
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2005-04-22 05:13:18 +08:00
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//
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2003-10-21 03:43:21 +08:00
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// The LLVM Compiler Infrastructure
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//
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2007-12-30 04:36:04 +08:00
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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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2005-04-22 05:13:18 +08:00
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//
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2003-10-21 03:43:21 +08:00
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//===----------------------------------------------------------------------===//
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2001-07-02 13:46:38 +08:00
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//
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2002-08-03 00:43:03 +08:00
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// This file implements the post-dominator construction algorithms.
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2001-07-02 13:46:38 +08:00
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//
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//===----------------------------------------------------------------------===//
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2008-04-16 12:21:16 +08:00
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#define DEBUG_TYPE "postdomtree"
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2002-08-22 07:43:50 +08:00
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#include "llvm/Analysis/PostDominators.h"
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2004-07-30 01:30:56 +08:00
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#include "llvm/Instructions.h"
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2002-02-13 05:07:25 +08:00
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#include "llvm/Support/CFG.h"
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2008-04-16 12:21:16 +08:00
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#include "llvm/Support/Debug.h"
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2004-09-02 06:55:40 +08:00
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SetOperations.h"
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2007-10-04 05:25:45 +08:00
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#include "llvm/Analysis/DominatorInternals.h"
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2003-12-07 08:35:42 +08:00
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using namespace llvm;
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2003-11-12 06:41:34 +08:00
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2006-03-11 10:20:46 +08:00
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//===----------------------------------------------------------------------===//
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2007-04-15 16:47:27 +08:00
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// PostDominatorTree Implementation
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2006-03-11 10:20:46 +08:00
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//===----------------------------------------------------------------------===//
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2007-05-03 09:11:54 +08:00
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char PostDominatorTree::ID = 0;
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char PostDominanceFrontier::ID = 0;
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2007-04-15 16:47:27 +08:00
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static RegisterPass<PostDominatorTree>
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2008-03-21 07:27:18 +08:00
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F("postdomtree", "Post-Dominator Tree Construction", true, true);
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2006-03-11 10:20:46 +08:00
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2007-10-03 11:20:17 +08:00
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bool PostDominatorTree::runOnFunction(Function &F) {
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2007-10-24 04:58:37 +08:00
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DT->recalculate(F);
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2009-08-23 13:17:37 +08:00
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DEBUG(DT->print(errs()));
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2007-10-03 11:20:17 +08:00
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return false;
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}
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2009-08-23 13:17:37 +08:00
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PostDominatorTree::~PostDominatorTree() {
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2008-05-04 04:25:26 +08:00
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delete DT;
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}
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2009-08-23 14:03:38 +08:00
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void PostDominatorTree::print(raw_ostream &OS, const Module *) const {
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DT->print(OS);
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2009-08-23 13:17:37 +08:00
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}
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2008-05-30 01:00:13 +08:00
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FunctionPass* llvm::createPostDomTree() {
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return new PostDominatorTree();
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}
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2001-07-02 13:46:38 +08:00
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//===----------------------------------------------------------------------===//
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2002-08-03 00:43:03 +08:00
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// PostDominanceFrontier Implementation
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2001-07-02 13:46:38 +08:00
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//===----------------------------------------------------------------------===//
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2006-08-28 06:30:17 +08:00
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static RegisterPass<PostDominanceFrontier>
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2008-03-21 07:27:18 +08:00
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H("postdomfrontier", "Post-Dominance Frontier Construction", true, true);
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2002-01-31 08:42:27 +08:00
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2002-04-29 00:21:30 +08:00
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const DominanceFrontier::DomSetType &
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2005-04-22 05:13:18 +08:00
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PostDominanceFrontier::calculate(const PostDominatorTree &DT,
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2007-06-04 08:32:22 +08:00
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const DomTreeNode *Node) {
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2001-07-07 00:58:22 +08:00
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// Loop over CFG successors to calculate DFlocal[Node]
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2003-09-12 00:26:13 +08:00
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BasicBlock *BB = Node->getBlock();
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2001-07-07 00:58:22 +08:00
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DomSetType &S = Frontiers[BB]; // The new set to fill in...
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2003-09-11 04:37:08 +08:00
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if (getRoots().empty()) return S;
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if (BB)
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for (pred_iterator SI = pred_begin(BB), SE = pred_end(BB);
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2007-04-18 09:19:55 +08:00
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SI != SE; ++SI) {
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2003-09-12 02:14:24 +08:00
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// Does Node immediately dominate this predecessor?
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2007-06-04 08:32:22 +08:00
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DomTreeNode *SINode = DT[*SI];
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2007-04-18 09:19:55 +08:00
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if (SINode && SINode->getIDom() != Node)
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2003-09-11 04:37:08 +08:00
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S.insert(*SI);
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2007-04-18 09:19:55 +08:00
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}
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2001-07-07 00:58:22 +08:00
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// At this point, S is DFlocal. Now we union in DFup's of our children...
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// Loop through and visit the nodes that Node immediately dominates (Node's
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// children in the IDomTree)
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//
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2007-06-04 08:32:22 +08:00
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for (DomTreeNode::const_iterator
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2002-07-27 02:40:14 +08:00
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NI = Node->begin(), NE = Node->end(); NI != NE; ++NI) {
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2007-06-04 08:32:22 +08:00
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DomTreeNode *IDominee = *NI;
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2002-07-27 02:40:14 +08:00
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const DomSetType &ChildDF = calculate(DT, IDominee);
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2001-07-07 00:58:22 +08:00
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DomSetType::const_iterator CDFI = ChildDF.begin(), CDFE = ChildDF.end();
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for (; CDFI != CDFE; ++CDFI) {
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2007-06-08 01:47:21 +08:00
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if (!DT.properlyDominates(Node, DT[*CDFI]))
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2005-04-22 12:01:18 +08:00
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S.insert(*CDFI);
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2001-07-07 00:58:22 +08:00
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}
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}
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return S;
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}
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2008-05-30 01:00:13 +08:00
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FunctionPass* llvm::createPostDomFrontier() {
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return new PostDominanceFrontier();
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2008-05-30 05:05:16 +08:00
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}
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