Move the dominator verification code out of special code embedded within

the PassManager code into a regular verifyAnalysis method.

Also, reorganize loop verification. Make the LoopPass infrastructure
call verifyLoop as needed instead of having LoopInfo::verifyAnalysis
check every loop in the function after each looop pass. Add a new
command-line argument, -verify-loop-info, to enable the expensive
full checking.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82952 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 39 insertions, 54 deletions

diff --git a/lib/VMCore/Dominators.cpp b/lib/VMCore/Dominators.cpp
index 1f17214..40e4c4b 100644
--- a/lib/VMCore/Dominators.cpp
+++ b/lib/VMCore/Dominators.cpp
@@ -24,9 +24,20 @@
 #include "llvm/Analysis/DominatorInternals.h"
 #include "llvm/Instructions.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/CommandLine.h"
 #include <algorithm>
 using namespace llvm;
 
+// Always verify dominfo if expensive checking is enabled.
+#ifdef XDEBUG
+bool VerifyDomInfo = true;
+#else
+bool VerifyDomInfo = false;
+#endif
+static cl::opt<bool,true>
+VerifyDomInfoX("verify-dom-info", cl::location(VerifyDomInfo),
+               cl::desc("Verify dominator info (time consuming)"));
+
 //===----------------------------------------------------------------------===//
 //  DominatorTree Implementation
 //===----------------------------------------------------------------------===//
@@ -48,6 +59,16 @@ bool DominatorTree::runOnFunction(Function &F) {
   return false;
 }
 
+void DominatorTree::verifyAnalysis() const {
+  if (!VerifyDomInfo || true /* fixme */) return;
+
+  Function &F = *getRoot()->getParent();
+
+  DominatorTree OtherDT;
+  OtherDT.getBase().recalculate(F);
+  assert(!compare(OtherDT) && "Invalid DominatorTree info!");
+}
+
 void DominatorTree::print(raw_ostream &OS, const Module *) const {
   DT->print(OS);
 }
@@ -87,6 +108,17 @@ char DominanceFrontier::ID = 0;
 static RegisterPass<DominanceFrontier>
 G("domfrontier", "Dominance Frontier Construction", true, true);
 
+void DominanceFrontier::verifyAnalysis() const {
+  if (!VerifyDomInfo) return;
+
+  DominatorTree &DT = getAnalysis<DominatorTree>();
+
+  DominanceFrontier OtherDF;
+  const std::vector<BasicBlock*> &DTRoots = DT.getRoots();
+  OtherDF.calculate(DT, DT.getNode(DTRoots[0]));
+  assert(!compare(OtherDF) && "Invalid DominanceFrontier info!");
+}
+
 // NewBB is split and now it has one successor. Update dominace frontier to
 // reflect this change.
 void DominanceFrontier::splitBlock(BasicBlock *NewBB) {
diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index a3496ed..f10bc6f 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -13,6 +13,7 @@
 
 
 #include "llvm/PassManagers.h"
+#include "llvm/Assembly/Writer.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Module.h"
@@ -22,7 +23,6 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/System/Mutex.h"
 #include "llvm/System/Threading.h"
-#include "llvm/Analysis/Dominators.h"
 #include "llvm-c/Core.h"
 #include <algorithm>
 #include <cstdio>
@@ -45,16 +45,6 @@ enum PassDebugLevel {
   None, Arguments, Structure, Executions, Details
 };
 
-// Always verify dominfo if expensive checking is enabled.
-#ifdef XDEBUG
-bool VerifyDomInfo = true;
-#else
-bool VerifyDomInfo = false;
-#endif
-static cl::opt<bool,true>
-VerifyDomInfoX("verify-dom-info", cl::location(VerifyDomInfo),
-               cl::desc("Verify dominator info (time consuming)"));
-
 static cl::opt<enum PassDebugLevel>
 PassDebugging("debug-pass", cl::Hidden,
                   cl::desc("Print PassManager debugging information"),
@@ -703,47 +693,13 @@ void PMDataManager::verifyPreservedAnalysis(Pass *P) {
   for (AnalysisUsage::VectorType::const_iterator I = PreservedSet.begin(),
          E = PreservedSet.end(); I != E; ++I) {
     AnalysisID AID = *I;
-    if (Pass *AP = findAnalysisPass(AID, true))
-      AP->verifyAnalysis();
-  }
-}
-
-/// verifyDomInfo - Verify dominator information if it is available.
-void PMDataManager::verifyDomInfo(Pass &P, Function &F) {
-  if (!VerifyDomInfo || !P.getResolver())
-    return;
+    if (Pass *AP = findAnalysisPass(AID, true)) {
 
-  DominatorTree *DT = P.getAnalysisIfAvailable<DominatorTree>();
-  if (!DT)
-    return;
-
-  DominatorTree OtherDT;
-  OtherDT.getBase().recalculate(F);
-  if (DT->compare(OtherDT)) {
-    errs() << "Dominator Information for " << F.getName() << "\n";
-    errs() << "Pass '" << P.getPassName() << "'\n";
-    errs() << "----- Valid -----\n";
-    OtherDT.dump();
-    errs() << "----- Invalid -----\n";
-    DT->dump();
-    llvm_unreachable("Invalid dominator info");
-  }
-
-  DominanceFrontier *DF = P.getAnalysisIfAvailable<DominanceFrontier>();
-  if (!DF) 
-    return;
-
-  DominanceFrontier OtherDF;
-  std::vector<BasicBlock*> DTRoots = DT->getRoots();
-  OtherDF.calculate(*DT, DT->getNode(DTRoots[0]));
-  if (DF->compare(OtherDF)) {
-    errs() << "Dominator Information for " << F.getName() << "\n";
-    errs() << "Pass '" << P.getPassName() << "'\n";
-    errs() << "----- Valid -----\n";
-    OtherDF.dump();
-    errs() << "----- Invalid -----\n";
-    DF->dump();
-    llvm_unreachable("Invalid dominator info");
+      Timer *T = 0;
+      if (TheTimeInfo) T = TheTimeInfo->passStarted(AP);
+      AP->verifyAnalysis();
+      if (T) T->stopTimer();
+    }
   }
 }
 
@@ -1384,9 +1340,6 @@ bool FPPassManager::runOnFunction(Function &F) {
     removeNotPreservedAnalysis(FP);
     recordAvailableAnalysis(FP);
     removeDeadPasses(FP, F.getName(), ON_FUNCTION_MSG);
-
-    // If dominator information is available then verify the info if requested.
-    verifyDomInfo(*FP, F);
   }
   return Changed;
 }