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[DWARF] Allow empty address range tables.

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Empty address range tables are allowed by the DWARF standard;
Moreover, generating them is recommended as a best practice, see
http://wiki.dwarfstd.org/index.php?title=Best_Practices#Generating_.debug_aranges_data

Differential Revision: https://reviews.llvm.org/D71931
This commit is contained in:
Igor Kudrin 2019-12-27 16:51:02 +07:00
parent ee1ac293cf
commit 6a79709adb
2 changed files with 26 additions and 2 deletions
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4
lib/DebugInfo/DWARF/DWARFDebugArangeSet.cpp
View File

@ -90,10 +90,10 @@ DWARFDebugArangeSet::extract(DataExtractor data, uint64_t *offset_ptr) {
if (arangeDescriptor.Address || arangeDescriptor.Length)
ArangeDescriptors.push_back(arangeDescriptor);
else
break; // We are done if we get a zero address and length
return true; // We are done if we get a zero address and length
}
return !ArangeDescriptors.empty();
return false; // No termination tuple is found.
}
return false;
}

24
test/DebugInfo/X86/dwarfdump-debug-aranges.s Normal file
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@ -0,0 +1,24 @@
# RUN: llvm-mc -triple x86_64-unknown-linux %s -filetype=obj -o - | \
# RUN: llvm-dwarfdump -debug-aranges - 2>&1 | \
# RUN: FileCheck %s
.section .debug_aranges,"",@progbits
# CHECK: .debug_aranges contents:
## Check that an empty set of ranges is supported.
.long .L1end - .L1version # Length
# CHECK: Address Range Header: length = 0x00000014,
.L1version:
.short 2 # Version
.long 0x3456789a # Debug Info Offset
.byte 4 # Address Size
.byte 0 # Segment Selector Size
# CHECK-SAME: version = 0x0002,
# CHECK-SAME: cu_offset = 0x3456789a,
# CHECK-SAME: addr_size = 0x04,
# CHECK-SAME: seg_size = 0x00
.space 4 # Padding
.L1tuples:
.long 0, 0 # Termination tuple
# CHECK-NOT: [0x
.L1end: