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If we use DW_AT_ranges we need to specify a base address that ranges

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are relative to in the compile unit. Currently let's just use 0...

Thanks to Greg Clayton for the catch!

llvm-svn: 200425
This commit is contained in:
Eric Christopher 2014-01-29 22:22:56 +00:00
parent 35db2b3d4c
commit 8873adaa60
2 changed files with 12 additions and 2 deletions
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10
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -1054,11 +1054,17 @@ void DwarfDebug::finalizeModuleInfo() {
// FIXME: We should use ranges if we have multiple compile units or
// allow reordering of code ala .subsections_via_symbols in mach-o.
DwarfCompileUnit *U = SkCU ? SkCU : static_cast<DwarfCompileUnit *>(TheU);
if (useCURanges() && TheU->getRanges().size())
if (useCURanges() && TheU->getRanges().size()) {
addSectionLabel(Asm, U, U->getUnitDie(), dwarf::DW_AT_ranges,
Asm->GetTempSymbol("cu_ranges", U->getUniqueID()),
DwarfDebugRangeSectionSym);
else
// A DW_AT_low_pc attribute may also be specified in combination with
// DW_AT_ranges to specify the default base address for use in location
// lists (see Section 2.6.2) and range lists (see Section 2.17.3).
U->addUInt(U->getUnitDie(), dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
0);
} else
U->addUInt(U->getUnitDie(), dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
0);
}

4
llvm/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
View File

@ -9,10 +9,12 @@
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x00000000)
; CHECK: DW_AT_ranges [DW_FORM_sec_offset] (0x00000000)
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x0000003c)
; CHECK: DW_AT_ranges [DW_FORM_sec_offset] (0x00000020)
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: .debug_line contents:
; CHECK-NEXT: Line table prologue:
@ -27,10 +29,12 @@
; DWARF3: DW_TAG_compile_unit
; DWARF3: DW_AT_stmt_list [DW_FORM_data4] (0x00000000)
; DWARF3: DW_AT_ranges [DW_FORM_data4] (0x00000000)
; DWARF3: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; DWARF3: DW_TAG_compile_unit
; DWARF3: DW_AT_stmt_list [DW_FORM_data4] (0x0000003c)
; DWARF3: DW_AT_ranges [DW_FORM_data4] (0x00000020)
; DWARF3: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; DWARF3: .debug_line contents:
; DWARF3-NEXT: Line table prologue: