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Dwarf: use a single line table to generate assembly when .loc is used.

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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
This commit is contained in:
Manman Ren
2013-05-21 00:57:22 +00:00
parent bf00bf9ad2
commit 01cb18ea08
2 changed files with 20 additions and 3 deletions
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17
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -708,6 +708,12 @@ CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
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 @@ CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
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 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
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());