From 50438771c09ad1c55ab7ee8bb8dc2044a6f0f351 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 15 Sep 2009 05:03:04 +0000
Subject: [PATCH] make -debug-pass=Executions show information about what call
 graph nodes are in the SCC for each execution of a CGSCC pass.

llvm-svn: 81838
---
 include/llvm/PassManagers.h           |  5 +++++
 lib/Analysis/IPA/CallGraphSCCPass.cpp | 15 ++++++++++++++-
 lib/VMCore/PassManager.cpp            | 17 +++++++++++++----
 3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/include/llvm/PassManagers.h b/include/llvm/PassManagers.h
index 1c4c741d434..6a14b152bb5 100644
--- a/include/llvm/PassManagers.h
+++ b/include/llvm/PassManagers.h
@@ -380,6 +380,11 @@ protected:
   // then PMT_Last active pass mangers.
   std::map<AnalysisID, Pass *> *InheritedAnalysis[PMT_Last];
 
+  
+  /// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions
+  /// or higher is specified.
+  bool isPassDebuggingExecutionsOrMore() const;
+  
 private:
   void dumpAnalysisUsage(const StringRef &Msg, const Pass *P,
                            const AnalysisUsage::VectorType &Set) const;
diff --git a/lib/Analysis/IPA/CallGraphSCCPass.cpp b/lib/Analysis/IPA/CallGraphSCCPass.cpp
index e4e0ecb2c9a..801ae1952cb 100644
--- a/lib/Analysis/IPA/CallGraphSCCPass.cpp
+++ b/lib/Analysis/IPA/CallGraphSCCPass.cpp
@@ -317,7 +317,20 @@ bool CGPassManager::runOnModule(Module &M) {
          PassNo != e; ++PassNo) {
       Pass *P = getContainedPass(PassNo);
 
-      dumpPassInfo(P, EXECUTION_MSG, ON_CG_MSG, "");
+      // If we're in -debug-pass=Executions mode, construct the SCC node list,
+      // otherwise avoid constructing this string as it is expensive.
+      if (isPassDebuggingExecutionsOrMore()) {
+        std::string Functions;
+#ifndef NDEBUG
+        raw_string_ostream OS(Functions);
+        for (unsigned i = 0, e = CurSCC.size(); i != e; ++i) {
+          if (i) OS << ", ";
+          CurSCC[i]->print(OS);
+        }
+        OS.flush();
+#endif
+        dumpPassInfo(P, EXECUTION_MSG, ON_CG_MSG, Functions);
+      }
       dumpRequiredSet(P);
 
       initializeAnalysisImpl(P);
diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index 83045cd4ab5..f2c9ea3b997 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -67,6 +67,15 @@ PassDebugging("debug-pass", cl::Hidden,
                              clEnumValEnd));
 } // End of llvm namespace
 
+/// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions
+/// or higher is specified.
+bool PMDataManager::isPassDebuggingExecutionsOrMore() const {
+  return PassDebugging >= Executions;
+}
+
+
+
+
 void PassManagerPrettyStackEntry::print(raw_ostream &OS) const {
   if (V == 0 && M == 0)
     OS << "Releasing pass '";
@@ -1044,7 +1053,7 @@ void PMDataManager::dumpPassInfo(Pass *P, enum PassDebuggingString S1,
     errs() << "' on Loop '" << Msg << "'...\n";
     break;
   case ON_CG_MSG:
-    errs() << "' on Call Graph '" << Msg << "'...\n";
+    errs() << "' on Call Graph Nodes '" << Msg << "'...\n";
     break;
   default:
     break;
@@ -1076,10 +1085,10 @@ void PMDataManager::dumpAnalysisUsage(const StringRef &Msg, const Pass *P,
     return;
   errs() << (void*)P << std::string(getDepth()*2+3, ' ') << Msg << " Analyses:";
   for (unsigned i = 0; i != Set.size(); ++i) {
-    if (i) errs() << ",";
-    errs() << " " << Set[i]->getPassName();
+    if (i) errs() << ',';
+    errs() << ' ' << Set[i]->getPassName();
   }
-  errs() << "\n";
+  errs() << '\n';
 }
 
 /// Add RequiredPass into list of lower level passes required by pass P.