From badc4fae531cc0fdaa8e58f481c3b1d23ea7dd56 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Thu, 7 Dec 2006 22:34:21 +0000
Subject: When new pass manager is created, initialize available analysis info
 of existing manager at the same level. Otherwise, such info may be considered
 as available, which not true.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32334 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/PassManager.cpp | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index d0672d1..76869fe 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -652,13 +652,17 @@ FunctionPassManagerImpl_New::addPass(Pass *P) {
   // If P is a BasicBlockPass then use BasicBlockPassManager_New.
   if (BasicBlockPass *BP = dynamic_cast<BasicBlockPass*>(P)) {
 
-    if (!activeBBPassManager
-        || !activeBBPassManager->addPass(BP)) {
+    if (!activeBBPassManager || !activeBBPassManager->addPass(BP)) {
 
-      // TODO : intialize AvailableAnalysis info
+      // If active manager exists then clear its analysis info.
+      if (activeBBPassManager)
+        activeBBPassManager->initializeAnalysisInfo();
 
+      // Create and add new manager
       activeBBPassManager = new BasicBlockPassManager_New();
       addPassToManager(activeBBPassManager, false);
+
+      // Add pass into new manager. This time it must succeed.
       if (!activeBBPassManager->addPass(BP))
         assert(0 && "Unable to add Pass");
     }
@@ -675,8 +679,13 @@ FunctionPassManagerImpl_New::addPass(Pass *P) {
     return false;
 
   addPassToManager (FP);
-  // TODO : intialize AvailableAnalysis info
-  activeBBPassManager = NULL;
+
+  // If active manager exists then clear its analysis info.
+  if (activeBBPassManager) {
+    activeBBPassManager->initializeAnalysisInfo();
+    activeBBPassManager = NULL;
+  }
+
   return true;
 }
 
@@ -784,11 +793,15 @@ ModulePassManager_New::addPass(Pass *P) {
     if (!activeFunctionPassManager
         || !activeFunctionPassManager->addPass(P)) {
 
-      // TODO : intialize AvailableAnalysis info
-      activeFunctionPassManager = NULL;
+      // If active manager exists then clear its analysis info.
+      if (activeFunctionPassManager) 
+        activeFunctionPassManager->initializeAnalysisInfo();
 
+      // Create and add new manager
       activeFunctionPassManager = new FunctionPassManagerImpl_New();
       addPassToManager(activeFunctionPassManager, false);
+
+      // Add pass into new manager. This time it must succeed.
       if (!activeFunctionPassManager->addPass(FP))
         assert(0 && "Unable to add pass");
     }
@@ -805,8 +818,12 @@ ModulePassManager_New::addPass(Pass *P) {
     return false;
 
   addPassToManager(MP);
-  // TODO : intialize AvailableAnalysis info
-  activeFunctionPassManager = NULL;
+  // If active manager exists then clear its analysis info.
+  if (activeFunctionPassManager) {
+    activeFunctionPassManager->initializeAnalysisInfo();
+    activeFunctionPassManager = NULL;
+  }
+
   return true;
 }
 
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