Dwarf: use a single line table to generate assembly when .loc is used.
This is to fix PR15408 where an undefined symbol Lline_table_start1 is used.
Since we do not generate the debug_line section when .loc is used,
Lline_table_start1 is not emitted and we can't refer to it when calculating
at_stmt_list for a compile unit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182344 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index b72e653..2d42af8 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -708,6 +708,12 @@
Asm->OutStreamer.getContext().setMCLineTableSymbol(LineTableStartSym,
NewCU->getUniqueID());
+ // Use a single line table if we are using .loc and generating assembly.
+ bool UseTheFirstCU =
+ (Asm->TM.hasMCUseLoc() &&
+ Asm->OutStreamer.getKind() == MCStreamer::SK_AsmStreamer) ||
+ (NewCU->getUniqueID() == 0);
+
// DW_AT_stmt_list is a offset of line number information for this
// compile unit in debug_line section. For split dwarf this is
// left in the skeleton CU and so not included.
@@ -716,9 +722,9 @@
if (!useSplitDwarf()) {
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
NewCU->addLabel(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
- NewCU->getUniqueID() == 0 ?
+ UseTheFirstCU ?
Asm->GetTempSymbol("section_line") : LineTableStartSym);
- else if (NewCU->getUniqueID() == 0)
+ else if (UseTheFirstCU)
NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
else
NewCU->addDelta(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
@@ -1453,7 +1459,12 @@
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
CompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
assert(TheCU && "Unable to find compile unit!");
- Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
+ if (Asm->TM.hasMCUseLoc() &&
+ Asm->OutStreamer.getKind() == MCStreamer::SK_AsmStreamer)
+ // Use a single line table if we are using .loc and generating assembly.
+ Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
+ else
+ Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
FunctionBeginSym = Asm->GetTempSymbol("func_begin",
Asm->getFunctionNumber());