https://bugs.llvm.org/show_bug.cgi?id=44274
Bug ID: 44274
Summary: Unknown standard opcodes printed as (null) in prologue
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: DebugInfo
Assignee: unassignedb...@nondot.org
Reporter: jh7370.2...@my.bristol.ac.uk
CC: jdevliegh...@apple.com, keith.wal...@arm.com,
llvm-bugs@lists.llvm.org,
paul_robin...@playstation.sony.com
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.
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