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Fix bug 19437 - Only add discriminators for DWARF 4 and above.

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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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206507 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Diego Novillo
2014-04-17 22:33:50 +00:00
parent 07f099b867
commit 0a0d620db3
5 changed files with 95 additions and 11 deletions
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8
lib/IR/Module.cpp
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@ -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 @@ void Module::dropAllReferences() {
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();
}