Tighten up the AnalysisUsage of lots of passes, primarily to correctly indicate whether or not they invalidate the CFGA

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2386 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/HoistPHIConstants.cpp

@@ -76,6 +76,10 @@ static bool doHoistPHIConstants(Function *M) {
 namespace {
   struct HoistPHIConstants : public FunctionPass {
     virtual bool runOnFunction(Function *F) { return doHoistPHIConstants(F); }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.preservesCFG();
+    }
   };
 }
 

lib/Transforms/IPO/ConstantMerge.cpp

@@ -82,6 +82,10 @@ namespace {
       Constants.clear();
       return false;
     }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
+    }
   };
   
   struct DynamicConstantMerge : public ConstantMerge {

lib/Transforms/Instrumentation/TraceValues.cpp

@@ -49,6 +49,10 @@ namespace {
     bool runOnFunction(Function *F) {
       return doit(F, TraceBasicBlockExits, TraceFunctionExits, PrintfFunc);
     }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.preservesCFG();
+    }
   };
 } // end anonymous namespace
 

lib/Transforms/LevelRaise.cpp

@@ -472,6 +472,10 @@ static bool doRPR(Function *F) {
 namespace {
   struct RaisePointerReferences : public FunctionPass {
     virtual bool runOnFunction(Function *F) { return doRPR(F); }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.preservesCFG();
+    }
   };
 }
 

lib/Transforms/Scalar/ConstantProp.cpp

@@ -219,6 +219,12 @@ namespace {
       
       return Modified;
     }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      // FIXME: This pass does not preserve the CFG because it folds terminator
+      // instructions!
+      //AU.preservesCFG();
+    }
   };
 }
 

lib/Transforms/Scalar/DecomposeMultiDimRefs.cpp

@@ -175,6 +175,10 @@ namespace {
     virtual bool runOnFunction(Function *F) {
       return doDecomposeMultiDimRefs(F);
     }
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.preservesCFG();
+    }
   };
 }
 

lib/Transforms/Scalar/GCSE.cpp

@@ -51,7 +51,7 @@ namespace {
 
     // This transformation requires dominator and immediate dominator info
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      //preservesCFG(AU);
+      AU.preservesCFG();
       AU.addRequired(DominatorSet::ID);
       AU.addRequired(ImmediateDominators::ID); 
     }

lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -203,6 +203,7 @@ namespace {
     
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired(LoopInfo::ID);
+      AU.preservesCFG();
     }
   };
 }

lib/Transforms/Scalar/InstructionCombining.cpp

@@ -42,10 +42,12 @@ namespace {
     }
 
   public:
-
-
     virtual bool runOnFunction(Function *F);
 
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.preservesCFG();
+    }
+
     // Visitation implementation - Implement instruction combining for different
     // instruction types.  The semantics are as follows:
     // Return Value:

lib/Transforms/Scalar/SCCP.cpp

@@ -470,6 +470,10 @@ namespace {
       SCCP S(F);
       return S.doSCCP();
     }
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      // FIXME: SCCP does not preserve the CFG because it folds terminators!
+      //AU.preservesCFG();
+    }
   };
 }
 

lib/Transforms/Scalar/SymbolStripping.cpp

@@ -64,6 +64,9 @@ namespace {
     virtual bool runOnFunction(Function *F) {
       return doSymbolStripping(F);
     }
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
+    }
   };
 
   struct FullSymbolStripping : public SymbolStripping {

lib/Transforms/Utils/PromoteMemoryToRegister.cpp

@@ -53,6 +53,7 @@ namespace {
     //
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired(DominanceFrontier::ID);
+      AU.preservesCFG();
     }
 
   private: