Add -disable-global-remove option to bugpoint.

Sometimes when bugpointing a crash the bugpoint-reduced-simplified.bc reproduces
a totally different bug than the original one ("GV doesn't have initializer").
Although its useful to report that bug too, I need a way to reduce the original
bug, hence I introduced -disable-global-remove.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72361 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/tools/bugpoint/CrashDebugger.cpp b/tools/bugpoint/CrashDebugger.cpp
index 4225a40c743bb01b166236abfbf7e23982b8d01b..2e43f88c7114862f3ce3af18a8b32ee7212ebe17 100644 (file)
--- a/tools/bugpoint/CrashDebugger.cpp
+++ b/tools/bugpoint/CrashDebugger.cpp
@@ -37,6 +37,10 @@ namespace {
   KeepMain("keep-main",
            cl::desc("Force function reduction to keep main"),
            cl::init(false));
+  cl::opt<bool>
+  NoGlobalRM ("disable-global-remove",
+         cl::desc("Do not remove global variables"),
+         cl::init(false));
 }
 
 namespace llvm {
@@ -344,7 +348,8 @@ bool ReduceCrashingBlocks::TestBlocks(std::vector<const BasicBlock*> &BBs) {
 static bool DebugACrash(BugDriver &BD,  bool (*TestFn)(BugDriver &, Module *)) {
   // See if we can get away with nuking some of the global variable initializers
   // in the program...
-  if (BD.getProgram()->global_begin() != BD.getProgram()->global_end()) {
+  if (!NoGlobalRM &&
+      BD.getProgram()->global_begin() != BD.getProgram()->global_end()) {
     // Now try to reduce the number of global variable initializers in the
     // module to something small.
     Module *M = CloneModule(BD.getProgram());