X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FAnalysis%2FTypeBasedAliasAnalysis.cpp;h=115872584cb298b1d076630f89eea8d1058872a6;hb=da5f3a3ca5bc534592535d02b2289845461f33db;hp=ff8955870cb554e9fc477d82d1032053c874f083;hpb=61a16d2a16724548f0f216165229950758bc2b25;p=oota-llvm.git

diff --git a/lib/Analysis/TypeBasedAliasAnalysis.cpp b/lib/Analysis/TypeBasedAliasAnalysis.cpp
index ff8955870cb..115872584cb 100644
--- a/lib/Analysis/TypeBasedAliasAnalysis.cpp
+++ b/lib/Analysis/TypeBasedAliasAnalysis.cpp
@@ -129,6 +129,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/ADT/SetVector.h"
 using namespace llvm;
 
 // A handy option for disabling TBAA functionality. The same effect can also be
@@ -282,9 +283,7 @@ namespace {
       initializeTypeBasedAliasAnalysisPass(*PassRegistry::getPassRegistry());
     }
 
-    void initializePass() override {
-      InitializeAliasAnalysis(this);
-    }
+    bool doInitialization(Module &M) override;
 
     /// getAdjustedAnalysisPointer - This method is used when a pass implements
     /// an analysis interface through multiple inheritance.  If needed, it
@@ -321,6 +320,11 @@ ImmutablePass *llvm::createTypeBasedAliasAnalysisPass() {
   return new TypeBasedAliasAnalysis();
 }
 
+bool TypeBasedAliasAnalysis::doInitialization(Module &M) {
+  InitializeAliasAnalysis(this, &M.getDataLayout());
+  return true;
+}
+
 void
 TypeBasedAliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
@@ -575,18 +579,22 @@ MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) {
     if (!B) return nullptr;
   }
 
-  SmallVector<MDNode *, 4> PathA;
+  SmallSetVector<MDNode *, 4> PathA;
   MDNode *T = A;
   while (T) {
-    PathA.push_back(T);
+    if (PathA.count(T))
+      report_fatal_error("Cycle found in TBAA metadata.");
+    PathA.insert(T);
     T = T->getNumOperands() >= 2 ? cast_or_null<MDNode>(T->getOperand(1))
                                  : nullptr;
   }
 
-  SmallVector<MDNode *, 4> PathB;
+  SmallSetVector<MDNode *, 4> PathB;
   T = B;
   while (T) {
-    PathB.push_back(T);
+    if (PathB.count(T))
+      report_fatal_error("Cycle found in TBAA metadata.");
+    PathB.insert(T);
     T = T->getNumOperands() >= 2 ? cast_or_null<MDNode>(T->getOperand(1))
                                  : nullptr;
   }