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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - DWARF line number 0 generated for nullptr"
href="https://bugs.llvm.org/show_bug.cgi?id=47831">47831</a>
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<tr>
<th>Summary</th>
<td>DWARF line number 0 generated for nullptr
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</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
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</tr>
<tr>
<th>Reporter</th>
<td>jan.kratochvil@redhat.com
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, keith.walker@arm.com, llvm-bugs@lists.llvm.org, paul_robinson@playstation.sony.com
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<div>
<pre>6121117484ddd7c5a03b40004a8bba58506ce9d0 = 2020-10-13
echo >line0.C 'extern void *p; void *f() { return p?:nullptr; }'|clang++ -c
-Wall -g -emit-llvm -o line0.bc line0.C;llvm-dis line0.bc;llc line0.bc;clang++
-c -o line0.o -Wall line0.s;llvm-dwarfdump -debug-line line0.o;llvm-objdump
-dlCr line0.o
Address Line Column File ISA Discriminator Flags
------------------ ------ ------ ------ --- ------------- -------------
0x0000000000000000 1 0 1 0 0 is_stmt
0x0000000000000004 1 36 1 0 0 is_stmt prologue_end
0x0000000000000014 0 36 1 0 0
0x0000000000000016 1 36 1 0 0
c: 48 83 f8 00 cmpq $0, %rax
10: 74 02 je 0x14 <f()+0x14>
12: eb 04 jmp 0x18 <f()+0x18>
14: 31 c0 xorl %eax, %eax
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ line==0
16: eb 00 jmp 0x18 <f()+0x18>
18: 5d popq %rbp
19: c3 retq
%0 = load i8*, i8** @p, align 8, !dbg !11
%tobool = icmp ne i8* %0, null, !dbg !11
br i1 %tobool, label %cond.true, label %cond.false, !dbg !11
cond.true: ; preds = %entry
br label %cond.end, !dbg !11
cond.false: ; preds = %entry
br label %cond.end, !dbg !11
cond.end: ; preds = %cond.false,
%cond.true
%cond = phi i8* [ %0, %cond.true ], [ null, %cond.false ], !dbg !11
^^^^ has no !dbg attached</pre>
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