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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unknown standard opcodes printed as (null) in prologue"
href="https://bugs.llvm.org/show_bug.cgi?id=44274">44274</a>
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<th>Summary</th>
<td>Unknown standard opcodes printed as (null) in prologue
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>DebugInfo
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jh7370.2008@my.bristol.ac.uk
</td>
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<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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<p>
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<pre>If the opcode base of a line table prologue is higher than 13 (i.e. the program
defines unknown standard opcodes), the unknown opcodes are printed as "(null)"
in the array, which doesn't look great. We should probably print something like
"DW_LNS_unknown" instead, which roughly matches what is done for unknown
DW_AT_* and other DWARF constants.
See test/tools/llvm-dwarfdump/X86/debug-line.s for an example:
# CHECK-NEXT: opcode_base: 14
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_copy] = 0
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_advance_pc] = 1
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_advance_line] = 1
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_set_file] = 1
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_set_column] = 1
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_negate_stmt] = 0
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_set_basic_block] = 0
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_const_add_pc] = 0
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_fixed_advance_pc] = 1
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_set_prologue_end] = 0
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_set_epilogue_begin] = 0
# CHECK-NEXT: standard_opcode_lengths[DW_LNS_set_isa] = 1
# CHECK-NEXT: standard_opcode_lengths[(null)] = 0 *** BAD ***
The verbose dumping currently prints these as an empty string, probably for the
same reason at a guess.</pre>
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</p>
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