Revert [AliasAnalysis] AAResults preserves AAManager.

Triggers use-after-free.

llvm-svn: 359055

llvm/include/llvm/Analysis/AliasAnalysis.h

@@ -1096,12 +1096,6 @@ bool isIdentifiedFunctionLocal(const Value *V);
 /// This manager effectively wraps the AnalysisManager for registering alias
 /// analyses. When you register your alias analysis with this manager, it will
 /// ensure the analysis itself is registered with its AnalysisManager.
-///
-/// The result of this analysis is only invalidated if one of the particular
-/// aggregated AA results end up being invalidated. This removes the need to
-/// explicitly preserve the results of `AAManager`. Note that analyses should no
-/// longer be registered once the `AAManager` is run.
-
 class AAManager : public AnalysisInfoMixin<AAManager> {
 public:
   using Result = AAResults;

llvm/lib/Analysis/AliasAnalysis.cpp

@@ -79,10 +79,12 @@ AAResults::~AAResults() {
 
 bool AAResults::invalidate(Function &F, const PreservedAnalyses &PA,
                            FunctionAnalysisManager::Invalidator &Inv) {
-  // AAResults preserves the AAManager by default, due to the stateless nature
-  // of AliasAnalysis. There is no need to check whether it has been preserved
-  // explicitly. However, we still need to check if any of the dependencies end
-  // up being invalidated, and invalidate ourselves in that case.
+  // Check if the AA manager itself has been invalidated.
+  auto PAC = PA.getChecker<AAManager>();
+  if (!PAC.preserved() && !PAC.preservedSet<AllAnalysesOn<Function>>())
+    return true; // The manager needs to be blown away, clear everything.
+
+  // Check all of the dependencies registered.
   for (AnalysisKey *ID : AADeps)
     if (Inv.invalidate(ID, F, PA))
       return true;

llvm/test/Analysis/MemoryDependenceAnalysis/invalidation.ll

@@ -1,16 +1,17 @@
 ; Test that memdep gets invalidated when the analyses it depends on are
 ; invalidated.
 ;
-; Check AA. AA is stateless, there's nothing to invalidate.
+; Check AA specifically.
 ; RUN: opt -disable-output -debug-pass-manager -aa-pipeline='basic-aa' %s 2>&1 \
 ; RUN:     -passes='require<memdep>,invalidate<aa>,gvn' \
 ; RUN:     | FileCheck %s --check-prefix=CHECK-AA-INVALIDATE
 ; CHECK-AA-INVALIDATE: Running pass: RequireAnalysisPass
 ; CHECK-AA-INVALIDATE: Running analysis: MemoryDependenceAnalysis
 ; CHECK-AA-INVALIDATE: Running pass: InvalidateAnalysisPass
-; CHECK-NOT-AA-INVALIDATE: Invalidating analysis: MemoryDependenceAnalysis
+; CHECK-AA-INVALIDATE: Invalidating analysis: AAManager
+; CHECK-AA-INVALIDATE: Invalidating analysis: MemoryDependenceAnalysis
 ; CHECK-AA-INVALIDATE: Running pass: GVN
-; CHECK-NOT-AA-INVALIDATE: Running analysis: MemoryDependenceAnalysis
+; CHECK-AA-INVALIDATE: Running analysis: MemoryDependenceAnalysis
 ;
 ; Check domtree specifically.
 ; RUN: opt -disable-output -debug-pass-manager %s 2>&1 \

llvm/test/Other/new-pass-manager.ll

@@ -355,11 +355,13 @@
 ; CHECK-AA-MODULE-INVALIDATE: Running analysis: AAManager
 ; CHECK-AA-MODULE-INVALIDATE: Finished llvm::Function pass manager run
 ; CHECK-AA-MODULE-INVALIDATE: Running pass: InvalidateAnalysisPass
+; CHECK-AA-MODULE-INVALIDATE: Invalidating analysis: AAManager
 ; CHECK-AA-MODULE-INVALIDATE: Invalidating analysis: GlobalsAA
 ; CHECK-AA-MODULE-INVALIDATE: Running pass: RequireAnalysisPass
 ; CHECK-AA-MODULE-INVALIDATE: Running analysis: GlobalsAA
 ; CHECK-AA-MODULE-INVALIDATE: Starting llvm::Function pass manager run
 ; CHECK-AA-MODULE-INVALIDATE: Running pass: AAEvaluator
+; CHECK-AA-MODULE-INVALIDATE: Running analysis: AAManager
 ; CHECK-AA-MODULE-INVALIDATE: Finished llvm::Function pass manager run
 ; CHECK-AA-MODULE-INVALIDATE: Finished llvm::Module pass manager run
 

llvm/unittests/Transforms/Scalar/LoopPassManagerTest.cpp

@@ -572,6 +572,7 @@ TEST_F(LoopPassManagerTest, InvalidationOfBundledAnalyses) {
   // invalidation and running.
   EXPECT_CALL(MFPHandle, run(HasName("f"), _))
       .WillOnce(Return(getLoopPassPreservedAnalyses()));
+  EXPECT_CALL(MLAHandle, invalidate(_, _, _)).Times(3);
   EXPECT_CALL(MLAHandle, run(HasName("loop.0.0"), _, _));
   EXPECT_CALL(MLAHandle, run(HasName("loop.0.1"), _, _));
   EXPECT_CALL(MLAHandle, run(HasName("loop.0"), _, _));