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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - TAG_label not created for labels"
href="https://bugs.llvm.org/show_bug.cgi?id=35526">35526</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>TAG_label not created for labels
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>DebugInfo
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pmatos@linki.tools
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>With a simple program like:
int main(void) {
top:
return 0;
}
which generates IR:
; ModuleID = 'test.c'
source_filename = "test.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: noinline nounwind uwtable
define i32 @main() #0 !dbg !6 {
entry:
%retval = alloca i32, align 4
store i32 0, i32* %retval, align 4
br label %top, !dbg !10
top: ; preds = %entry
ret i32 0, !dbg !11
}
attributes #0 = { noinline nounwind uwtable
"correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false"
"less-precise-fpmad"="false" "no-frame-pointer-elim"="true"
"no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false"
"no-jump-tables"="false" "no-nans-fp-math"="false"
"no-signed-zeros-fp-math"="false" "no-trapping-math"="false"
"stack-protector-buffer-size"="8" "target-cpu"="x86-64"
"target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false"
"use-soft-float"="false" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang
version 5.0.0 (trunk 297627)", isOptimized: false, runtimeVersion: 0,
emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test.c", directory:
"/home/pmatos/Clients/embecosm/BUGS/b639")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 5.0.0 (trunk 297627)"}
!6 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type:
!7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped,
isOptimized: false, unit: !0, variables: !2)
!7 = !DISubroutineType(types: !8)
!8 = !{!9}
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !DILocation(line: 1, column: 16, scope: !6)
!11 = !DILocation(line: 3, column: 3, scope: !6)
LLVM is not generating the respective DW_TAG_label. For example, gcc generates:
<2><4a>: Abbrev Number: 3 (DW_TAG_label)
<4b> DW_AT_name : top
<4f> DW_AT_decl_file : 1
<50> DW_AT_decl_line : 2
<51> DW_AT_low_pc : 0x0
This is useful because it allows one to set a breakpoint through the label.</pre>
</div>
</p>
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