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DebugInfo: Add GNU_addr_base and GNU_ranges_base only when there are addresses or ranges 

Based on code review feedback from Eric in r204672.

llvm-svn: 204702
This commit is contained in:
David Blaikie 2014-03-25 05:34:24 +00:00
parent 1425622ad8
commit 3ffe4dd67f
4 changed files with 24 additions and 16 deletions
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24
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -956,6 +956,17 @@ void DwarfDebug::finalizeModuleInfo() {
dwarf::DW_FORM_data8, ID);
SkCU->addUInt(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
dwarf::DW_FORM_data8, ID);
// We don't keep track of which addresses are used in which CU so this
// is a bit pessimistic under LTO.
if (!InfoHolder.getAddrPool()->empty())
addSectionLabel(Asm, SkCU, SkCU->getUnitDie(),
dwarf::DW_AT_GNU_addr_base, DwarfAddrSectionSym,
DwarfAddrSectionSym);
if (!TheU->getRangeLists().empty())
addSectionLabel(Asm, SkCU, SkCU->getUnitDie(),
dwarf::DW_AT_GNU_ranges_base,
DwarfDebugRangeSectionSym, DwarfDebugRangeSectionSym);
}
// If we have code split among multiple sections or non-contiguous
@ -2660,19 +2671,6 @@ DwarfCompileUnit *DwarfDebug::constructSkeletonCU(const DwarfCompileUnit *CU) {
initSkeletonUnit(CU, Die, NewCU);
// Relocate to the beginning of the addr_base section, else 0 for the
// beginning of the one for this compile unit.
// 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);
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;
}

3
llvm/test/DebugInfo/X86/fission-cu.ll
View File

@ -59,8 +59,6 @@
; CHECK-NEXT: DW_AT_stmt_list [DW_FORM_sec_offset] (0x00000000)
; CHECK-NEXT: DW_AT_GNU_dwo_name [DW_FORM_strp] ( .debug_str[0x00000000] = "baz.dwo")
; CHECK-NEXT: DW_AT_comp_dir [DW_FORM_strp] ( .debug_str[0x00000008] = "/usr/local/google/home/echristo/tmp")
; CHECK-NEXT: DW_AT_GNU_addr_base [DW_FORM_sec_offset] (0x00000000)
; CHECK-NEXT: DW_AT_GNU_ranges_base [DW_FORM_sec_offset] (0x00000000)
; CHECK-NEXT: DW_AT_GNU_dwo_id [DW_FORM_data8] (0x1f1f859683d49324)
; Check that the rest of the compile units have information.
@ -108,7 +106,6 @@
; OBJ-NEXT: R_X86_64_32 .debug_str
; OBJ-NEXT: R_X86_64_32 .debug_str
; OBJ-NEXT: R_X86_64_32 .debug_addr
; OBJ-NEXT: R_X86_64_32 .debug_ranges
; OBJ-NEXT: }
; HDR-NOT: .debug_aranges

9
llvm/test/DebugInfo/X86/fission-ranges.ll
View File

@ -2,6 +2,15 @@
; RUN: llvm-dwarfdump %t | FileCheck %s
; RUN: llvm-objdump -h %t | FileCheck --check-prefix=HDR %s
; CHECK: .debug_info contents:
; CHECK: DW_TAG_compile_unit
; CHECK-NEXT: DW_AT_stmt_list
; CHECK-NEXT: DW_AT_GNU_dwo_name
; CHECK-NEXT: DW_AT_comp_dir
; CHECK-NEXT: DW_AT_GNU_dwo_id
; CHECK-NEXT: DW_AT_GNU_addr_base [DW_FORM_sec_offset] (0x00000000)
; CHECK: .debug_info.dwo contents:
; CHECK: DW_AT_location [DW_FORM_sec_offset] ([[A:0x[0-9a-z]*]])
; CHECK: DW_AT_location [DW_FORM_sec_offset] ([[E:0x[0-9a-z]*]])

4
llvm/test/DebugInfo/empty.ll
View File

@ -1,6 +1,7 @@
; REQUIRES: object-emission
; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump - | FileCheck %s
; RUN: %llc_dwarf -split-dwarf=Enable < %s -filetype=obj | llvm-dwarfdump - | FileCheck --check-prefix=FISSION %s
; darwin has a workaround for a linker bug so it always emits one line table entry
; XFAIL: darwin
@ -17,6 +18,9 @@
; CHECK: .debug_pubtypes contents:
; CHECK-NOT: Offset
; Don't emit DW_AT_addr_base when there are no addresses.
; FISSION-NOT: DW_AT_GNU_addr_base [DW_FORM_sec_offset]
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!5}