Fix bug 19437 - Only add discriminators for DWARF 4 and above.
Summary:
This prevents the discriminator generation pass from triggering if
the DWARF version being used in the module is prior to 4.
Reviewers: echristo, dblaikie
CC: llvm-commits
Differential Revision: http://reviews.llvm.org/D3413
llvm-svn: 206507
diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
index 43f42bc..5dbed69 100644
--- a/llvm/lib/IR/Module.cpp
+++ b/llvm/lib/IR/Module.cpp
@@ -23,6 +23,7 @@
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LeakDetector.h"
+#include "llvm/Support/Dwarf.h"
#include <algorithm>
#include <cstdarg>
#include <cstdlib>
@@ -429,3 +430,10 @@
for(Module::alias_iterator I = alias_begin(), E = alias_end(); I != E; ++I)
I->dropAllReferences();
}
+
+unsigned Module::getDwarfVersion() const {
+ Value *Val = getModuleFlag("Dwarf Version");
+ if (!Val)
+ return dwarf::DWARF_VERSION;
+ return cast<ConstantInt>(Val)->getZExtValue();
+}