Minimal unwinding information (DWARF CFI) checker #145633

amsen20 · 2025-06-25T04:47:29Z

This PR adds a minimal version of UnwindInfoChecker described in here.

This implementation looks into the modified registers by each instruction and checks:

If one of them is the CFA register, and it informs the user if the CFA data is not modified as well.
If one of them is used in another register's unwinding rule, it informs the user if the unwind info is not modified after this instruction.

This implementation does not support DWARF expressions and treats them as unknown unwinding rules.

…mple CFI analysis

…/Write conditions

- Changing the register and not informing it using cfi directives - Changing the CFA and report it wrong - Load a register from another register stored location

…mer.h

…can be removed

llvm-ci · 2025-07-09T01:58:22Z

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/23071

Here is the relevant piece of the build log for the reference

Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: DWARFCFIChecker/X86/empty-section.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -triple x86_64-pc-linux-gnu /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DWARFCFIChecker/X86/empty-section.s --validate-cfi --filetype=null 2>&1 | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DWARFCFIChecker/X86/empty-section.s --allow-empty --implicit-check-not warning: --implicit-check-not error: # RUN: at line 1
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -triple x86_64-pc-linux-gnu /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DWARFCFIChecker/X86/empty-section.s --validate-cfi --filetype=null
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DWARFCFIChecker/X86/empty-section.s --allow-empty --implicit-check-not warning: --implicit-check-not error:
�[1mcommand line:1:22: �[0m�[0;1;31merror: �[0m�[1mIMPLICIT-CHECK-NOT: excluded string found in input
�[0m-implicit-check-not='error:'
�[0;1;32m                     ^
�[0m�[1m<stdin>:1:65: �[0m�[0;1;30mnote: �[0m�[1mfound here
�[0m/Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
�[0;1;32m                                                                ^~~~~~
�[0m
Input file: <stdin>
Check file: /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DWARFCFIChecker/X86/empty-section.s

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

Input was:
<<<<<<
�[1m�[0m�[0;1;30m          1: �[0m�[1m�[0;1;46m/Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.�[0m
�[0;1;32meof:3                                                                                                                                                          ^
�[0m�[0;1;32mnot:imp1     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
�[0m�[0;1;31mnot:imp2                                                                     !~~~~~                                                                             error: no match expected
�[0m>>>>>>

--

********************

llvm-ci · 2025-07-09T02:18:17Z

LLVM Buildbot has detected a new failure on builder clang-aarch64-quick running on linaro-clang-aarch64-quick while building llvm at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/65/builds/19256

Here is the relevant piece of the build log for the reference

Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: DWARFCFIChecker/X86/spill-two-reg.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/llvm-mc -triple x86_64-pc-linux-gnu /home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/test/DWARFCFIChecker/X86/spill-two-reg.s --validate-cfi --filetype=null 2>&1 | /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/test/DWARFCFIChecker/X86/spill-two-reg.s # RUN: at line 1
+ /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/llvm-mc -triple x86_64-pc-linux-gnu /home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/test/DWARFCFIChecker/X86/spill-two-reg.s --validate-cfi --filetype=null
+ /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/test/DWARFCFIChecker/X86/spill-two-reg.s
/home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/test/DWARFCFIChecker/X86/spill-two-reg.s:16:11: error: CHECK: expected string not found in input
 # CHECK: warning: CFA offset is changed from 8 to 16, and CFA register RSP is modified, but validating the modification amount is not implemented yet
          ^
<stdin>:1:1: note: scanning from here
/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
^

Input file: <stdin>
Check file: /home/tcwg-buildbot/worker/clang-aarch64-quick/llvm/llvm/test/DWARFCFIChecker/X86/spill-two-reg.s

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

Input was:
<<<<<<
          1: /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
check:16     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
>>>>>>

--

********************

llvm-ci · 2025-07-09T03:16:32Z

LLVM Buildbot has detected a new failure on builder clang-armv8-quick running on linaro-clang-armv8-quick while building llvm at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/154/builds/18461

Here is the relevant piece of the build log for the reference

Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: DWARFCFIChecker/X86/single-func-missed-cfi-directive.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
not /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/llvm-mc -triple x86_64-pc-linux-gnu /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/DWARFCFIChecker/X86/single-func-missed-cfi-directive.s --validate-cfi --filetype=null 2>&1 | /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/DWARFCFIChecker/X86/single-func-missed-cfi-directive.s # RUN: at line 1
+ not /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/llvm-mc -triple x86_64-pc-linux-gnu /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/DWARFCFIChecker/X86/single-func-missed-cfi-directive.s --validate-cfi --filetype=null
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/DWARFCFIChecker/X86/single-func-missed-cfi-directive.s
/home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/DWARFCFIChecker/X86/single-func-missed-cfi-directive.s:16:11: error: CHECK: expected string not found in input
 # CHECK: error: changed register RBP, that register RBP's unwinding rule uses, but there is no CFI directives about it
          ^
<stdin>:1:1: note: scanning from here
/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
^

Input file: <stdin>
Check file: /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/DWARFCFIChecker/X86/single-func-missed-cfi-directive.s

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

Input was:
<<<<<<
          1: /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
check:16     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
>>>>>>

--

********************

llvm-ci · 2025-07-09T05:01:08Z

LLVM Buildbot has detected a new failure on builder llvm-clang-win-x-aarch64 running on as-builder-2 while building llvm at step 9 "test-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/193/builds/8938

Here is the relevant piece of the build log for the reference

Step 9 (test-check-llvm) failure: Test just built components: check-llvm completed (failure)
******************** TEST 'LLVM :: DWARFCFIChecker/X86/cfa-corner-cases.s' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
not c:\buildbot\as-builder-2\x-aarch64\build\bin\llvm-mc.exe -triple x86_64-pc-linux-gnu C:\buildbot\as-builder-2\x-aarch64\llvm-project\llvm\test\DWARFCFIChecker\X86\cfa-corner-cases.s --validate-cfi --filetype=null 2>&1 | c:\buildbot\as-builder-2\x-aarch64\build\bin\filecheck.exe C:\buildbot\as-builder-2\x-aarch64\llvm-project\llvm\test\DWARFCFIChecker\X86\cfa-corner-cases.s
# executed command: not 'c:\buildbot\as-builder-2\x-aarch64\build\bin\llvm-mc.exe' -triple x86_64-pc-linux-gnu 'C:\buildbot\as-builder-2\x-aarch64\llvm-project\llvm\test\DWARFCFIChecker\X86\cfa-corner-cases.s' --validate-cfi --filetype=null
# executed command: 'c:\buildbot\as-builder-2\x-aarch64\build\bin\filecheck.exe' 'C:\buildbot\as-builder-2\x-aarch64\llvm-project\llvm\test\DWARFCFIChecker\X86\cfa-corner-cases.s'
# .---command stderr------------
# | C:\buildbot\as-builder-2\x-aarch64\llvm-project\llvm\test\DWARFCFIChecker\X86\cfa-corner-cases.s:17:11: error: CHECK: expected string not found in input
# |  # CHECK: error: modified CFA register RSP but not changed CFA rule
# |           ^
# | <stdin>:1:1: note: scanning from here
# | c:\buildbot\as-builder-2\x-aarch64\build\bin\llvm-mc.exe: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
# | ^
# | <stdin>:1:59: note: possible intended match here
# | c:\buildbot\as-builder-2\x-aarch64\build\bin\llvm-mc.exe: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
# |                                                           ^
# | 
# | Input file: <stdin>
# | Check file: C:\buildbot\as-builder-2\x-aarch64\llvm-project\llvm\test\DWARFCFIChecker\X86\cfa-corner-cases.s
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             1: c:\buildbot\as-builder-2\x-aarch64\build\bin\llvm-mc.exe: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
# | check:17'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# | check:17'1                                                               ?                                                                                  possible intended match
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

********************

dyung · 2025-07-09T05:41:11Z

It looks like we need a lit.local.cfg file to mark the tests as unsupported if X86 is not in the built targets?

amsen20 · 2025-07-09T05:44:59Z

It looks like we need a lit.local.cfg file to mark the tests as unsupported if X86 is not in the built targets?

I submitted a PR that fixes it, if it doesn't get fixed I'll add Required: x86 to the tests

amsen20 · 2025-07-09T06:01:53Z

lit.local.cfg

@dyung I changed the PR and added lit.local.cfg that ignores the target if it doesn't support X86, but I cannot test it on Mac by myself.
Do you have any idea how I can test if it fixes it or not?

llvm-ci · 2025-07-09T06:16:08Z

LLVM Buildbot has detected a new failure on builder llvm-clang-win-x-armv7l running on as-builder-1 while building llvm at step 9 "test-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/38/builds/4318

Here is the relevant piece of the build log for the reference

Step 9 (test-check-llvm) failure: Test just built components: check-llvm completed (failure)
******************** TEST 'LLVM :: DWARFCFIChecker/X86/empty-nested-frames.s' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
c:\buildbot\as-builder-1\x-armv7l\build\bin\llvm-mc.exe -triple x86_64-pc-linux-gnu C:\buildbot\as-builder-1\x-armv7l\llvm-project\llvm\test\DWARFCFIChecker\X86\empty-nested-frames.s --validate-cfi --filetype=null 2>&1 | c:\buildbot\as-builder-1\x-armv7l\build\bin\filecheck.exe C:\buildbot\as-builder-1\x-armv7l\llvm-project\llvm\test\DWARFCFIChecker\X86\empty-nested-frames.s --allow-empty --implicit-check-not warning: --implicit-check-not error:
# executed command: 'c:\buildbot\as-builder-1\x-armv7l\build\bin\llvm-mc.exe' -triple x86_64-pc-linux-gnu 'C:\buildbot\as-builder-1\x-armv7l\llvm-project\llvm\test\DWARFCFIChecker\X86\empty-nested-frames.s' --validate-cfi --filetype=null
# note: command had no output on stdout or stderr
# error: command failed with exit status: 1
# executed command: 'c:\buildbot\as-builder-1\x-armv7l\build\bin\filecheck.exe' 'C:\buildbot\as-builder-1\x-armv7l\llvm-project\llvm\test\DWARFCFIChecker\X86\empty-nested-frames.s' --allow-empty --implicit-check-not warning: --implicit-check-not error:
# .---command stderr------------
# | command line:1:22: error: IMPLICIT-CHECK-NOT: excluded string found in input
# | -implicit-check-not='error:'
# |                      ^
# | <stdin>:1:58: note: found here
# | c:\buildbot\as-builder-1\x-armv7l\build\bin\llvm-mc.exe: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
# |                                                          ^~~~~~
# | 
# | Input file: <stdin>
# | Check file: C:\buildbot\as-builder-1\x-armv7l\llvm-project\llvm\test\DWARFCFIChecker\X86\empty-nested-frames.s
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |           1: c:\buildbot\as-builder-1\x-armv7l\build\bin\llvm-mc.exe: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
# | not:imp2                                                              !~~~~~                                                                             error: no match expected
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

********************

dyung · 2025-07-09T08:13:13Z

lit.local.cfg

@dyung I changed the PR and added lit.local.cfg that ignores the target if it doesn't support X86, but I cannot test it on Mac by myself. Do you have any idea how I can test if it fixes it or not?

Thanks! It looks like this fixed the issue. From your change, I didn't see anything that was Mac-specific, so it shouldn't have really required a Mac to test (and from it passing it proves it did not).

llvm-ci · 2025-07-09T09:42:46Z

LLVM Buildbot has detected a new failure on builder clang-solaris11-sparcv9 running on solaris11-sparcv9 while building llvm at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/13/builds/8258

Here is the relevant piece of the build log for the reference

Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: DWARFCFIChecker/X86/empty-nested-frames.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/llvm-mc -triple x86_64-pc-linux-gnu /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/DWARFCFIChecker/X86/empty-nested-frames.s --validate-cfi --filetype=null 2>&1 | /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/FileCheck /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/DWARFCFIChecker/X86/empty-nested-frames.s --allow-empty --implicit-check-not warning: --implicit-check-not error: # RUN: at line 1
+ /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/llvm-mc -triple x86_64-pc-linux-gnu /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/DWARFCFIChecker/X86/empty-nested-frames.s --validate-cfi --filetype=null
+ /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/FileCheck /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/DWARFCFIChecker/X86/empty-nested-frames.s --allow-empty --implicit-check-not warning: --implicit-check-not error:
command line:1:22: error: IMPLICIT-CHECK-NOT: excluded string found in input
-implicit-check-not='error:'
                     ^
<stdin>:1:87: note: found here
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
                                                                                      ^~~~~~

Input file: <stdin>
Check file: /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/DWARFCFIChecker/X86/empty-nested-frames.s

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

Input was:
<<<<<<
          1: /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/llvm-mc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.
not:imp2                                                                                           !~~~~~                                                                             error: no match expected
>>>>>>

--

********************

Amirhossein Pashaeehir added 30 commits June 25, 2025 03:55

Forward CFI directives alongside their associated instruction to a si…

5b78ea0

…mple CFI analysis

Create a new CFI analysis for each dwarf separately

b781e83

Separate the logic and display

8b43f8c

Compile llvm mc depending on bolt

6790f90

Extract semantic info on MCInst from bolt

75f3b2d

Typo in evaluateStackOffsetExpr doc

a3d08d8

Add a DS to keep track of each register CFI state

7a10923

Check if the CFA change is correct or not

5841b8f

Add the CFI validation as a option to llvm-mc tool

69a8e9d

Provide the directives as an arrayref instead of index range

43b54fd

Remove TODOs

474ff1c

Wrap all the MCPB info needed into a ExtendedMCInstrAnalysis class

8ea5d9c

Use extended MCAnalysis instead of MCplus (directly)

e92005c

Make the CFA checker to first generate, if not matched check the Read…

7527ba2

…/Write conditions

Check register states as well

3d65eeb

Process prologue as well

79c1664

Ignore flag registers as well

02410ac

Enable dump

dfdd22f

Enable getting flag register through extended MCInstrAnalysis

4fd37bf

Move the isolated MC semantic methods to ExtendedMCAnalysis

07d38b2

Remove unused includes

eb06aa4

Test cfi validator on following cases:

e7c3140

- Changing the register and not informing it using cfi directives - Changing the CFA and report it wrong - Load a register from another register stored location

Prune the CFA diff checker to only check read/write

6347ef4

Move the CFI analysis headers to MC

453917b

Move all the CFI analysis implementations to lib

9f8bca8

Remove stack pointer method

2c233f9

Comment out Ignoring flags at the beginning CFI analysis

12faad8

Move the necessary MCStreamer interface methods to CFIAnalysisMCStrea…

282cb77

…mer.h

Make the update method const

903e3fb

Move CFI analysis out of MC layer

7bb20f8

Amirhossein Pashaeehir added 10 commits July 7, 2025 22:54

Lint

d901096

Reword the future support for dwarf expressions

8dd62ea

Fix punctuation error

7e461ad

Reformat Run tests to one line

aa3d1d7

Change TODO style in all tests

cc2107f

Check llvm-mc does not emit any error or warnings for each test

2d04fc1

Replace CHECK-NOT with implicit-check-not

f83d966

Mention that remember state is not supported

742ab6f

Test all CFA directives

8acbc43

Mention why remember and restore state is not supported

24e398b

Sterling-Augustine approved these changes Jul 8, 2025

View reviewed changes

Amirhossein Pashaeehir added 5 commits July 8, 2025 18:04

Document why some directives are not supported and test them

b6b9b57

Merge branch 'main' into cfi-validation-generation

5c789de

Depends on DebugInfoDWARFLowLevel instead of DebugInfoDWARF

da67918

Mention why --alow-empty is used for --validate-cfi tests and how it …

78c8c2b

…can be removed

Include low level debug info library inside headers

e186683

ilovepi approved these changes Jul 8, 2025

View reviewed changes

petrhosek merged commit db03408 into llvm:main Jul 9, 2025
9 checks passed

This was referenced Jul 9, 2025

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