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DebugInfo: Implement relative addressing for DW_AT_ranges under fission

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This removes the debug_ranges relocations from debug_info.dwo (but
doesn't implement the DW_AT_GNU_ranges_base which is also necessary for
correct functioning)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204668 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-03-24 21:07:27 +00:00
parent 05e62b507a
commit f4ec1889db
2 changed files with 19 additions and 5 deletions
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11
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -456,8 +456,15 @@ void DwarfDebug::addScopeRangeList(DwarfCompileUnit *TheCU, DIE *ScopeDIE,
// Emit offset in .debug_range as a relocatable label. emitDIE will handle
// emitting it appropriately.
MCSymbol *RangeSym = Asm->GetTempSymbol("debug_ranges", GlobalRangeCount++);
addSectionLabel(Asm, TheCU, ScopeDIE, dwarf::DW_AT_ranges, RangeSym,
DwarfDebugRangeSectionSym);
// Under fission, ranges are specified by constant offsets relative to the
// CU's DW_AT_GNU_ranges_base.
if (useSplitDwarf())
TheCU->addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, RangeSym,
DwarfDebugRangeSectionSym);
else
addSectionLabel(Asm, TheCU, ScopeDIE, dwarf::DW_AT_ranges, RangeSym,
DwarfDebugRangeSectionSym);
RangeSpanList List(RangeSym);
for (const InsnRange &R : Range) {

13
test/DebugInfo/X86/fission-ranges.ll
View File

@ -1,5 +1,14 @@
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
; RUN: llvm-dwarfdump -debug-dump=all %t | FileCheck %s
; RUN: llvm-dwarfdump -debug-dump=info.dwo %t | FileCheck %s
; RUN: llvm-objdump -r %t | FileCheck --check-prefix=RELA %s
; CHECK: DW_AT_ranges [DW_FORM_sec_offset] (0x000000a0)
; Make sure we don't produce any relocations in any .dwo section (though in particular, debug_info.dwo)
; FIXME: There should be no relocations in .dwo sections at all, but for now there are debug_loc relocs here.
; RELA: RELOCATION RECORDS FOR [.rela.debug_info.dwo]
; RELA-NOT: R_X86_64_32 .debug_ranges
; RELA: RELOCATION RECORDS FOR
; From the code:
@ -29,8 +38,6 @@
; clang -g -S -gsplit-dwarf -O1 small.c
; CHECK: DW_AT_ranges
@c = external global i32
; Function Attrs: nounwind uwtable