fix crashes when we only have a prototype for main.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20627 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 3 insertions, 3 deletions

diff --git a/lib/Analysis/DataStructure/BottomUpClosure.cpp b/lib/Analysis/DataStructure/BottomUpClosure.cpp
index 6c26602889..91cfc7c14e 100644
--- a/lib/Analysis/DataStructure/BottomUpClosure.cpp
+++ b/lib/Analysis/DataStructure/BottomUpClosure.cpp
@@ -85,7 +85,7 @@ bool BUDataStructures::runOnModule(Module &M) {
   // Merge the globals variables (not the calls) from the globals graph back
   // into the main function's graph so that the main function contains all of
   // the information about global pools and GV usage in the program.
-  if (MainFunc) {
+  if (MainFunc && !MainFunc->isExternal()) {
     DSGraph &MainGraph = getOrCreateGraph(MainFunc);
     const DSGraph &GG = *MainGraph.getGlobalsGraph();
     ReachabilityCloner RC(MainGraph, GG, 
diff --git a/lib/Analysis/DataStructure/CompleteBottomUp.cpp b/lib/Analysis/DataStructure/CompleteBottomUp.cpp
index 4dcfc35483..5a0436c061 100644
--- a/lib/Analysis/DataStructure/CompleteBottomUp.cpp
+++ b/lib/Analysis/DataStructure/CompleteBottomUp.cpp
@@ -94,7 +94,7 @@ bool CompleteBUDataStructures::runOnModule(Module &M) {
   // Merge the globals variables (not the calls) from the globals graph back
   // into the main function's graph so that the main function contains all of
   // the information about global pools and GV usage in the program.
-  if (MainFunc) {
+  if (MainFunc && !MainFunc->isExternal()) {
     DSGraph &MainGraph = getOrCreateGraph(*MainFunc);
     const DSGraph &GG = *MainGraph.getGlobalsGraph();
     ReachabilityCloner RC(MainGraph, GG, 
diff --git a/lib/Analysis/DataStructure/EquivClassGraphs.cpp b/lib/Analysis/DataStructure/EquivClassGraphs.cpp
index 2ddc684e01..e895ef3c13 100644
--- a/lib/Analysis/DataStructure/EquivClassGraphs.cpp
+++ b/lib/Analysis/DataStructure/EquivClassGraphs.cpp
@@ -106,7 +106,7 @@ bool EquivClassGraphs::runOnModule(Module &M) {
   // Merge the globals variables (not the calls) from the globals graph back
   // into the main function's graph so that the main function contains all of
   // the information about global pools and GV usage in the program.
-  if (MainFunc) {
+  if (MainFunc && !MainFunc->isExternal()) {
     DSGraph &MainGraph = getOrCreateGraph(*MainFunc);
     const DSGraph &GG = *MainGraph.getGlobalsGraph();
     ReachabilityCloner RC(MainGraph, GG,