[PH] Replace uses of AssertingVH from members of analysis results with

a lazy-asserting PoisoningVH.

AssertVH is fundamentally incompatible with cache-invalidation of
analysis results. The invaliadtion happens after the AssertingVH has
already fired. Instead, use a PoisoningVH that will assert if the
dangling handle is ever used rather than merely be assigned or
destroyed.

This patch also removes all of the (numerous) doomed attempts to work
around this fundamental incompatibility. It is a pretty significant
simplification IMO.

The most interesting change is in the Inliner where we still do some
clearing because we don't want to rely on the coarse grained
invalidation strategy of the containing pass manager. However, I prefer
the approach that contains this logic to the cleanup phase of the
Inliner, and I think we could enhance the CGSCC analysis management
layer to make this even better in the future if desired.

The rest is straight cleanup.

I've also added a test for one of the harder cases to work around: when
a *module analysis* contains many AssertingVHes pointing at functions.

Differential Revision: https://reviews.llvm.org/D29006

llvm-svn: 292928

1 files changed, 1 insertions, 17 deletions

diff --git a/llvm/lib/Transforms/IPO/GlobalDCE.cpp b/llvm/lib/Transforms/IPO/GlobalDCE.cpp
index 9304e783d49..67e9d20eb92 100644
--- a/llvm/lib/Transforms/IPO/GlobalDCE.cpp
+++ b/llvm/lib/Transforms/IPO/GlobalDCE.cpp
@@ -144,29 +144,13 @@ PreservedAnalyses GlobalDCEPass::run(Module &M, ModuleAnalysisManager &MAM) {
       }
     }
 
-  // Because we may have cached analyses for functions we take extra care when
-  // deleting them if there is an active proxy. If there isn't, then we get to
-  // assume that everything in the function AM has been cleared already.
-  // FIXME: Note that all of this will happen automatically when this pass
-  // finishes. Unfortuantely there are analyses which hold asserting VHs to
-  // IR units. We could make those weak VHs that would assert if ever used
-  // without asserting eagerly and then all of this knowledge of the analysis
-  // manager could go away.
-  FunctionAnalysisManager *FAM = nullptr;
-  if (auto *FAMProxy =
-          MAM.getCachedResult<FunctionAnalysisManagerModuleProxy>(M))
-    FAM = &FAMProxy->getManager();
-
   // The second pass drops the bodies of functions which are dead...
   std::vector<Function *> DeadFunctions;
   for (Function &F : M)
     if (!AliveGlobals.count(&F)) {
       DeadFunctions.push_back(&F);         // Keep track of dead globals
-      if (!F.isDeclaration()) {
-        if (FAM)
-          FAM->clear(F);
+      if (!F.isDeclaration())
         F.deleteBody();
-      }
     }
 
   // The third pass drops targets of aliases which are dead...