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DebugInfo: Add DW_AT_GNU_ranges_base to skeleton CUs

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This is used to avoid relocations in the dwo file by allowing
DW_AT_ranges specified in debug_info.dwo to be relative to this base
address. (r204667 implements the base-relative DW_AT_ranges side of
this)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204672 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2014-03-24 21:31:35 +00:00
parent 2563e201c1
commit 882d89ead8
2 changed files with 16 additions and 9 deletions
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13
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -2651,8 +2651,7 @@ void DwarfDebug::initSkeletonUnit(const DwarfUnit *U, DIE *Die,
// This DIE has the following attributes: DW_AT_comp_dir, DW_AT_stmt_list,
// DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
// DW_AT_ranges_base, DW_AT_addr_base.
// TODO: Implement DW_AT_ranges_base.
// DW_AT_addr_base, DW_AT_ranges_base.
DwarfCompileUnit *DwarfDebug::constructSkeletonCU(const DwarfCompileUnit *CU) {
DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
@ -2667,10 +2666,16 @@ DwarfCompileUnit *DwarfDebug::constructSkeletonCU(const DwarfCompileUnit *CU) {
// Relocate to the beginning of the addr_base section, else 0 for the
// beginning of the one for this compile unit.
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
// We could shave off some space if we deferred adding these attributes until
// the end of the CU to see if we have a non-empty debug_addr and debug_ranges
// sections so we don't bother with extra attributes and relocations.
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections()) {
NewCU->addSectionLabel(Die, dwarf::DW_AT_GNU_addr_base, DwarfAddrSectionSym);
else
NewCU->addSectionLabel(Die, dwarf::DW_AT_GNU_ranges_base, DwarfDebugRangeSectionSym);
} else {
NewCU->addSectionOffset(Die, dwarf::DW_AT_GNU_addr_base, 0);
NewCU->addSectionOffset(Die, dwarf::DW_AT_GNU_ranges_base, 0);
}
return NewCU;
}