mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 21:29:28 +00:00
so that Dominators.h is *just* domtree. Also prune #includes a bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122714 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.3 KiB
C++
103 lines
3.3 KiB
C++
//===- PostDominators.cpp - Post-Dominator Calculation --------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the post-dominator construction algorithms.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "postdomtree"
|
|
|
|
#include "llvm/Analysis/PostDominators.h"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/Support/CFG.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/ADT/DepthFirstIterator.h"
|
|
#include "llvm/ADT/SetOperations.h"
|
|
#include "llvm/Assembly/Writer.h"
|
|
#include "llvm/Analysis/DominatorInternals.h"
|
|
using namespace llvm;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// PostDominatorTree Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
char PostDominatorTree::ID = 0;
|
|
char PostDominanceFrontier::ID = 0;
|
|
INITIALIZE_PASS(PostDominatorTree, "postdomtree",
|
|
"Post-Dominator Tree Construction", true, true)
|
|
|
|
bool PostDominatorTree::runOnFunction(Function &F) {
|
|
DT->recalculate(F);
|
|
return false;
|
|
}
|
|
|
|
PostDominatorTree::~PostDominatorTree() {
|
|
delete DT;
|
|
}
|
|
|
|
void PostDominatorTree::print(raw_ostream &OS, const Module *) const {
|
|
DT->print(OS);
|
|
}
|
|
|
|
|
|
FunctionPass* llvm::createPostDomTree() {
|
|
return new PostDominatorTree();
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// PostDominanceFrontier Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
INITIALIZE_PASS_BEGIN(PostDominanceFrontier, "postdomfrontier",
|
|
"Post-Dominance Frontier Construction", true, true)
|
|
INITIALIZE_PASS_DEPENDENCY(PostDominatorTree)
|
|
INITIALIZE_PASS_END(PostDominanceFrontier, "postdomfrontier",
|
|
"Post-Dominance Frontier Construction", true, true)
|
|
|
|
const DominanceFrontier::DomSetType &
|
|
PostDominanceFrontier::calculate(const PostDominatorTree &DT,
|
|
const DomTreeNode *Node) {
|
|
// Loop over CFG successors to calculate DFlocal[Node]
|
|
BasicBlock *BB = Node->getBlock();
|
|
DomSetType &S = Frontiers[BB]; // The new set to fill in...
|
|
if (getRoots().empty()) return S;
|
|
|
|
if (BB)
|
|
for (pred_iterator SI = pred_begin(BB), SE = pred_end(BB);
|
|
SI != SE; ++SI) {
|
|
BasicBlock *P = *SI;
|
|
// Does Node immediately dominate this predecessor?
|
|
DomTreeNode *SINode = DT[P];
|
|
if (SINode && SINode->getIDom() != Node)
|
|
S.insert(P);
|
|
}
|
|
|
|
// At this point, S is DFlocal. Now we union in DFup's of our children...
|
|
// Loop through and visit the nodes that Node immediately dominates (Node's
|
|
// children in the IDomTree)
|
|
//
|
|
for (DomTreeNode::const_iterator
|
|
NI = Node->begin(), NE = Node->end(); NI != NE; ++NI) {
|
|
DomTreeNode *IDominee = *NI;
|
|
const DomSetType &ChildDF = calculate(DT, IDominee);
|
|
|
|
DomSetType::const_iterator CDFI = ChildDF.begin(), CDFE = ChildDF.end();
|
|
for (; CDFI != CDFE; ++CDFI) {
|
|
if (!DT.properlyDominates(Node, DT[*CDFI]))
|
|
S.insert(*CDFI);
|
|
}
|
|
}
|
|
|
|
return S;
|
|
}
|
|
|
|
FunctionPass* llvm::createPostDomFrontier() {
|
|
return new PostDominanceFrontier();
|
|
}
|