[DWARF] Suppress split line tables more carefully.
If a given split type unit does not have source locations, don't have
it refer to the split line table.
If no split type unit refers to the split line table, don't emit the
line table at all.
This will save a little space on rare occasions, but also refactors
things a bit to improve which class is responsible for what.
Responding to review comments on r326395.
Differential Revision: https://reviews.llvm.org/D44220
llvm-svn: 328670
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
index 5de3963..328e354 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
@@ -367,6 +367,7 @@
const DIE *Ty;
DwarfCompileUnit &CU;
MCDwarfDwoLineTable *SplitLineTable;
+ bool UsedLineTable = false;
unsigned getOrCreateSourceID(const DIFile *File) override;
bool isDwoUnit() const override;