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9cb7f49ee9
Also, add a FIXME for a bug in PostDomTree calculation I noticed while writing this, git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42593 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
3.4 KiB
C++
99 lines
3.4 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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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#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/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SetOperations.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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static RegisterPass<PostDominatorTree>
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F("postdomtree", "Post-Dominator Tree Construction", true);
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bool PostDominatorTree::runOnFunction(Function &F) {
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reset(); // Reset from the last time we were run...
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// Initialize the roots list
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for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
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TerminatorInst *Insn = I->getTerminator();
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if (Insn->getNumSuccessors() == 0) {
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// Unreachable block is not a root node.
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if (!isa<UnreachableInst>(Insn))
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Roots.push_back(I);
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}
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// Prepopulate maps so that we don't get iterator invalidation issues later.
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IDoms[I] = 0;
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DomTreeNodes[I] = 0;
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}
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Vertex.push_back(0);
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Calculate<Inverse<BasicBlock*> >(*this, F);
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return false;
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}
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//===----------------------------------------------------------------------===//
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// PostDominanceFrontier Implementation
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//===----------------------------------------------------------------------===//
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static RegisterPass<PostDominanceFrontier>
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H("postdomfrontier", "Post-Dominance Frontier Construction", 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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// Does Node immediately dominate this predecessor?
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DomTreeNode *SINode = DT[*SI];
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if (SINode && SINode->getIDom() != Node)
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S.insert(*SI);
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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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// Ensure that this .cpp file gets linked when PostDominators.h is used.
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DEFINING_FILE_FOR(PostDominanceFrontier)
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