[llvm] [DebugInfo][DWARF] Set is_stmt on first non-line-0 instruction in BB (PR #105524)

Thu Aug 29 03:49:21 PDT 2024

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/4660

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: DebugInfo/Generic/is_stmt-at-block-start.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 6: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -O0 -filetype=obj < /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/is_stmt-at-block-start.ll | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-dwarfdump --debug-line - | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/is_stmt-at-block-start.ll
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -O0 -filetype=obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-dwarfdump --debug-line -
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/is_stmt-at-block-start.ll
[1m/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/is_stmt-at-block-start.ll:9:15: [0m[0;1;31merror: [0m[1mCHECK-NEXT: expected string not found in input
[0m; CHECK-NEXT: {{0x[0-9a-f]+}} 13 5 {{.+}} is_stmt
[0;1;32m              ^
[0m[1m<stdin>:37:40: [0m[0;1;30mnote: [0m[1mscanning from here
[0m0x000000000000000c 13 5 1 0 0 0 is_stmt prologue_end
[0;1;32m                                       ^
[0m[1m<stdin>:39:8: [0m[0;1;30mnote: [0m[1mpossible intended match here
[0m0x0000000000000014 13 5 1 0 0 0 
[0;1;32m       ^
[0m
Input file: <stdin>
Check file: /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/is_stmt-at-block-start.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
[1m[0m[0;1;30m          1: [0m[1m[0;1;46m-: file format Mach-O arm64 [0m
[0;1;30m          2: [0m[1m[0;1;46m [0m
[0;1;30m          3: [0m[1m[0;1;46m.debug_line contents: [0m
[0;1;30m          4: [0m[1m[0;1;46mdebug_line[0x00000000] [0m
[0;1;30m          5: [0m[1m[0;1;46mLine table prologue: [0m
[0;1;30m          6: [0m[1m[0;1;46m total_length: 0x00000045 [0m
[0;1;30m          7: [0m[1m[0;1;46m format: DWARF32 [0m
[0;1;30m          8: [0m[1m[0;1;46m version: 4 [0m
[0;1;30m          9: [0m[1m[0;1;46m prologue_length: 0x00000020 [0m
[0;1;30m         10: [0m[1m[0;1;46m min_inst_length: 1 [0m
[0;1;30m         11: [0m[1m[0;1;46mmax_ops_per_inst: 1 [0m
[0;1;30m         12: [0m[1m[0;1;46m default_is_stmt: 1 [0m
[0;1;30m         13: [0m[1m[0;1;46m line_base: -5 [0m
[0;1;30m         14: [0m[1m[0;1;46m line_range: 14 [0m
[0;1;30m         15: [0m[1m[0;1;46m opcode_base: 13 [0m
[0;1;30m         16: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_copy] = 0 [0m
[0;1;30m         17: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_advance_pc] = 1 [0m
[0;1;30m         18: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_advance_line] = 1 [0m
[0;1;30m         19: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_set_file] = 1 [0m
[0;1;30m         20: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_set_column] = 1 [0m
[0;1;30m         21: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_negate_stmt] = 0 [0m
[0;1;30m         22: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_set_basic_block] = 0 [0m
[0;1;30m         23: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_const_add_pc] = 0 [0m
[0;1;30m         24: [0m[1m[0;1;46mstandard_opcode_lengths[DW_LNS_fixed_advance_pc] = 1 [0m
...

```

</details>

https://github.com/llvm/llvm-project/pull/105524