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[DWARF] Make llvm-dwarfdump display the .debug_loc.dwo section. Fixes PR38991.

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Reviewer: dblaikie

Differential Revision: https://reviews.llvm.org/D52444

llvm-svn: 344068
This commit is contained in:
Wolfgang Pieb 2018-10-09 18:38:55 +00:00
parent f1f598dab2
commit 9d2a915748
2 changed files with 24 additions and 5 deletions
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9
lib/DebugInfo/DWARF/DWARFContext.cpp
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@ -692,11 +692,10 @@ const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
LocDWO.reset(new DWARFDebugLocDWO());
// Assume all compile units have the same address byte size.
if (getNumCompileUnits()) {
DataExtractor LocData(DObj->getLocDWOSection().Data, isLittleEndian(),
getUnitAtIndex(0)->getAddressByteSize());
LocDWO->parse(LocData);
}
// FIXME: We don't need AddressSize for split DWARF since relocatable
// addresses cannot appear there. At the moment DWARFExpression requires it.
DataExtractor LocData(DObj->getLocDWOSection().Data, isLittleEndian(), 4);
LocDWO->parse(LocData);
return LocDWO.get();
}

20
test/tools/llvm-dwarfdump/X86/debug_loc_dwo.s Normal file
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@ -0,0 +1,20 @@
# RUN: llvm-mc %s -filetype obj -triple x86_64-pc-linux -o %t.o
# RUN: llvm-dwarfdump --debug-loc %t.o | FileCheck %s
# We make sure that llvm-dwarfdump can dump the .debug_loc.dwo section
# without requiring a compilation unit in the .debug_info.dwo section.
# CHECK: .debug_loc.dwo contents:
# CHECK-NEXT: 0x00000000:
# CHECK-NEXT: Addr idx 1 (w/ length 16): DW_OP_reg5 RDI
.section .debug_loc.dwo,"",@progbits
# One location list. The pre-DWARF v5 implementation only recognizes
# DW_LLE_startx_length as an entry kind in .debug_loc.dwo (besides
# end_of_list), which is what llvm generates as well.
.byte 3 # DW_LLE_startx_length
.byte 0x01 # Index
.long 0x10 # Length
.short 1 # Loc expr size
.byte 85 # DW_OP_reg5
.byte 0 # DW_LLE_end_of_list