forked from OSchip/llvm-project
103 lines
3.3 KiB
C++
103 lines
3.3 KiB
C++
//===- PostDominators.cpp - Post-Dominator Calculation --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the post-dominator construction algorithms.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "postdomtree"
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#include "llvm/Analysis/PostDominators.h"
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#include "llvm/Instructions.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SetOperations.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Analysis/DominatorInternals.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// PostDominatorTree Implementation
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//===----------------------------------------------------------------------===//
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char PostDominatorTree::ID = 0;
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char PostDominanceFrontier::ID = 0;
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INITIALIZE_PASS(PostDominatorTree, "postdomtree",
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"Post-Dominator Tree Construction", true, true)
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bool PostDominatorTree::runOnFunction(Function &F) {
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DT->recalculate(F);
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return false;
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}
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PostDominatorTree::~PostDominatorTree() {
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delete DT;
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}
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void PostDominatorTree::print(raw_ostream &OS, const Module *) const {
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DT->print(OS);
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}
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FunctionPass* llvm::createPostDomTree() {
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return new PostDominatorTree();
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}
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//===----------------------------------------------------------------------===//
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// PostDominanceFrontier Implementation
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//===----------------------------------------------------------------------===//
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INITIALIZE_PASS_BEGIN(PostDominanceFrontier, "postdomfrontier",
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"Post-Dominance Frontier Construction", true, true)
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INITIALIZE_PASS_DEPENDENCY(PostDominatorTree)
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INITIALIZE_PASS_END(PostDominanceFrontier, "postdomfrontier",
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"Post-Dominance Frontier Construction", true, true)
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const DominanceFrontier::DomSetType &
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PostDominanceFrontier::calculate(const PostDominatorTree &DT,
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const DomTreeNode *Node) {
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// Loop over CFG successors to calculate DFlocal[Node]
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BasicBlock *BB = Node->getBlock();
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DomSetType &S = Frontiers[BB]; // The new set to fill in...
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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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SI != SE; ++SI) {
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BasicBlock *P = *SI;
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// Does Node immediately dominate this predecessor?
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DomTreeNode *SINode = DT[P];
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if (SINode && SINode->getIDom() != Node)
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S.insert(P);
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}
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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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for (DomTreeNode::const_iterator
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NI = Node->begin(), NE = Node->end(); NI != NE; ++NI) {
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DomTreeNode *IDominee = *NI;
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const DomSetType &ChildDF = calculate(DT, IDominee);
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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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if (!DT.properlyDominates(Node, DT[*CDFI]))
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S.insert(*CDFI);
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}
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}
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return S;
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}
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FunctionPass* llvm::createPostDomFrontier() {
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return new PostDominanceFrontier();
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}
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