Factor some code from the DomTree and PostDomTree calculate methods up into
each one's runOnFunction method.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42563 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/PostDominators.cpp b/lib/Analysis/PostDominators.cpp
index cd29749..0ca7388 100644
--- a/lib/Analysis/PostDominators.cpp
+++ b/lib/Analysis/PostDominators.cpp
@@ -28,6 +28,29 @@
static RegisterPass<PostDominatorTree>
F("postdomtree", "Post-Dominator Tree Construction", true);
+bool PostDominatorTree::runOnFunction(Function &F) {
+ reset(); // Reset from the last time we were run...
+
+ // Initialize the roots list
+ for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
+ TerminatorInst *Insn = I->getTerminator();
+ if (Insn->getNumSuccessors() == 0) {
+ // Unreachable block is not a root node.
+ if (!isa<UnreachableInst>(Insn))
+ Roots.push_back(I);
+ }
+
+ // Prepopulate maps so that we don't get iterator invalidation issues later.
+ IDoms[I] = 0;
+ DomTreeNodes[I] = 0;
+ }
+
+ Vertex.push_back(0);
+
+ PDTcalculate(*this, F);
+ return false;
+}
+
//===----------------------------------------------------------------------===//
// PostDominanceFrontier Implementation
//===----------------------------------------------------------------------===//