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[dwarfdump] Warn for tags with DW_CHILDREN_yes but no children. #1867

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Merged
JDevlieghere merged 2 commits into from
Oct 7, 2020
Merged

[dwarfdump] Warn for tags with DW_CHILDREN_yes but no children. #1867

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d626bb8
[dwarfdump] Warn for tags with DW_CHILDREN_yes but no children.
JDevlieghere Sep 24, 2020
c6c82ad
[llvm] Remove no-children.yaml test
JDevlieghere Oct 6, 2020
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9 changes: 9 additions & 0 deletions llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,15 @@ unsigned DWARFVerifier::verifyUnitContents(DWARFUnit &Unit) {
NumUnitErrors += verifyDebugInfoForm(Die, AttrValue);
}

if (Die.hasChildren()) {
if (Die.getFirstChild().isValid() &&
Die.getFirstChild().getTag() == DW_TAG_null) {
warn() << dwarf::TagString(Die.getTag())
<< " has DW_CHILDREN_yes but DIE has no children: ";
Die.dump(OS);
}
}

NumUnitErrors += verifyDebugInfoCallSite(Die);
}

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4 changes: 3 additions & 1 deletion llvm/test/DebugInfo/X86/skeleton-unit-verify.s
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Expand Up @@ -3,6 +3,8 @@

# CHECK: Verifying .debug_abbrev...
# CHECK-NEXT: Verifying .debug_info Unit Header Chain...
# CHECK-NEXT: warning: DW_TAG_skeleton_unit has DW_CHILDREN_yes but DIE has no children
# CHECK-NEXT: DW_TAG_skeleton_unit
# CHECK-NEXT: error: Skeleton compilation unit has children.
# CHECK-NEXT: Verifying .debug_info references...
# CHECK-NEXT: Verifying .debug_types Unit Header Chain...
Expand Down Expand Up @@ -30,7 +32,7 @@
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.quad -6573227469967412476
.byte 1 # Abbrev [1]
.byte 1 # Abbrev [1]
.byte 0
.Lcu_end0:
.long .Lcu_end1-.Lcu_start1 # Length of Unit
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3 changes: 2 additions & 1 deletion llvm/test/tools/llvm-dwarfdump/X86/verify_die_ranges.s
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Expand Up @@ -3,7 +3,8 @@
# RUN: | FileCheck %s

# CHECK: Verifying .debug_info Unit Header Chain...
# CHECK-NEXT: error: Invalid address range [0x0000000000000007, 0x0000000000000006)
# CHECK: warning: DW_TAG_compile_unit has DW_CHILDREN_yes but DIE has no children:
# CHECK: error: Invalid address range [0x0000000000000007, 0x0000000000000006)

.section __TEXT,__text,regular,pure_instructions
.macosx_version_min 10, 12
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