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[DWARF5][DWARFVerifier] Check that Skeleton compilation unit does not have children.

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That patch adds checking into DWARFVerifier that the Skeleton
compilation unit does not have children.

Differential Revision: https://reviews.llvm.org/D71244
This commit is contained in:
Alexey Lapshin 2019-12-10 13:00:19 +03:00
parent 040bcfb5b7
commit 75c11c7169
2 changed files with 55 additions and 0 deletions
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8
lib/DebugInfo/DWARF/DWARFVerifier.cpp
View File

@ -196,6 +196,14 @@ unsigned DWARFVerifier::verifyUnitContents(DWARFUnit &Unit) {
NumUnitErrors++;
}
// According to DWARF Debugging Information Format Version 5,
// 3.1.2 Skeleton Compilation Unit Entries:
// "A skeleton compilation unit has no children."
if (Die.getTag() == dwarf::DW_TAG_skeleton_unit && Die.hasChildren()) {
error() << "Skeleton compilation unit has children.\n";
NumUnitErrors++;
}
DieRangeInfo RI;
NumUnitErrors += verifyDieRanges(Die, RI);

47
test/DebugInfo/X86/skeleton-unit-verify.s Normal file
View File

@ -0,0 +1,47 @@
# RUN: llvm-mc -triple x86_64-unknown-linux %s -filetype=obj -o %t.o
# RUN: not llvm-dwarfdump --verify %t.o | FileCheck %s
# CHECK: Verifying .debug_abbrev...
# CHECK-NEXT: Verifying .debug_info Unit Header Chain...
# CHECK-NEXT: error: Skeleton compilation unit has children.
# CHECK-NEXT: Verifying .debug_info references...
# CHECK-NEXT: Verifying .debug_types Unit Header Chain...
# CHECK-NEXT: Errors detected.
.section .debug_abbrev,"",@progbits
.byte 1 # Abbreviation Code
.byte 74 # DW_TAG_skeleton_unit
.byte 0 # DW_CHILDREN_no
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # Abbreviation Code
.byte 74 # DW_TAG_skeleton_unit
.byte 1 # DW_CHILDREN_yes
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.Lcu_begin0:
.long .Lcu_end0-.Lcu_start0 # Length of Unit
.Lcu_start0:
.short 5 # DWARF version number
.byte 4 # DWARF Unit Type
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.quad -6573227469967412476
.byte 1 # Abbrev [1]
.byte 0
.Lcu_end0:
.long .Lcu_end1-.Lcu_start1 # Length of Unit
.Lcu_start1:
.short 5 # DWARF version number
.byte 4 # DWARF Unit Type
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.quad -6573227469967412476
.byte 2 # Abbrev [2]
.byte 0
.Lcu_end1: