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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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10
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -168,14 +168,6 @@ DIType DbgVariable::getType() const {
} // end llvm namespace
/// Return Dwarf Version by checking module flags.
static unsigned getDwarfVersionFromModule(const Module *M) {
Value *Val = M->getModuleFlag("Dwarf Version");
if (!Val)
return dwarf::DWARF_VERSION;
return cast<ConstantInt>(Val)->getZExtValue();
}
DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
: Asm(A), MMI(Asm->MMI), FirstCU(0), PrevLabel(NULL), GlobalRangeCount(0),
InfoHolder(A, "info_string", DIEValueAllocator),
@ -211,7 +203,7 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
DwarfVersion = DwarfVersionNumber
? DwarfVersionNumber
: getDwarfVersionFromModule(MMI->getModule());
: MMI->getModule()->getDwarfVersion();
{
NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);