Identify Analysis pass.

Do not run analysis pass again if analysis info is still available.
This fixes PR1441.

llvm-svn: 48476

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/CFGPrinter.cpp b/llvm/lib/Analysis/CFGPrinter.cpp
index a96e9d066ee..7b61ff8ebfe 100644
--- a/llvm/lib/Analysis/CFGPrinter.cpp
+++ b/llvm/lib/Analysis/CFGPrinter.cpp
@@ -94,6 +94,9 @@ namespace {
     static char ID; // Pass identifcation, replacement for typeid
     CFGViewer() : FunctionPass((intptr_t)&ID) {}
 
+    /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+    virtual bool isAnalysis() const { return true; }
+
     virtual bool runOnFunction(Function &F) {
       F.viewCFG();
       return false;
@@ -114,6 +117,9 @@ namespace {
     static char ID; // Pass identifcation, replacement for typeid
     CFGOnlyViewer() : FunctionPass((intptr_t)&ID) {}
 
+    /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+    virtual bool isAnalysis() const { return true; }
+
     virtual bool runOnFunction(Function &F) {
       CFGOnly = true;
       F.viewCFG();
@@ -137,6 +143,9 @@ namespace {
     CFGPrinter() : FunctionPass((intptr_t)&ID) {}
     explicit CFGPrinter(intptr_t pid) : FunctionPass(pid) {}
 
+    /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+    virtual bool isAnalysis() const { return true; }
+
     virtual bool runOnFunction(Function &F) {
       std::string Filename = "cfg." + F.getName() + ".dot";
       cerr << "Writing '" << Filename << "'...";
@@ -164,6 +173,10 @@ namespace {
   struct VISIBILITY_HIDDEN CFGOnlyPrinter : public CFGPrinter {
     static char ID; // Pass identification, replacement for typeid
     CFGOnlyPrinter() : CFGPrinter((intptr_t)&ID) {}
+
+    /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+    virtual bool isAnalysis() const { return true; }
+
     virtual bool runOnFunction(Function &F) {
       bool OldCFGOnly = CFGOnly;
       CFGOnly = true;