[clang] [NFC][clang] Add ubsan-trap-merge.c test to show absence of nomerge (PR #117649)

Tue Nov 26 14:26:05 PST 2024

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-sie-ubuntu-fast` running on `sie-linux-worker` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/144/builds/12581

<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 'Clang :: CodeGen/ubsan-trap-merge.c' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 5: /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/clang -cc1 -internal-isystem /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/lib/clang/20/include -nostdsysteminc -triple x86_64-linux-gnu -emit-llvm -fsanitize=signed-integer-overflow -fsanitize-trap=signed-integer-overflow -O3 -mllvm -ubsan-unique-traps /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c -o -      | /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/clang -cc1 -internal-isystem /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/lib/clang/20/include -nostdsysteminc -triple x86_64-linux-gnu -emit-llvm -fsanitize=signed-integer-overflow -fsanitize-trap=signed-integer-overflow -O3 -mllvm -ubsan-unique-traps /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c -o -
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c
[1m/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c:10:17: [0m[0;1;31merror: [0m[1mCHECK-LABEL: expected string not found in input
[0m// CHECK-LABEL: define dso_local noundef i32 @f(
[0;1;32m                ^
[0m[1m<stdin>:1:1: [0m[0;1;30mnote: [0m[1mscanning from here
[0m; ModuleID = '/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c'
[0;1;32m^
[0m[1m<stdin>:72:1: [0m[0;1;30mnote: [0m[1mpossible intended match here
[0mdefine dso_local noundef i32 @m(i32 noundef %x, i32 noundef %y) local_unnamed_addr #0 {
[0;1;32m^
[0m
Input file: <stdin>
Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c

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

Input was:
<<<<<<
[1m[0m[0;1;30m            1: [0m[1m[0;1;46m; ModuleID = '/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c' [0m
[0;1;31mlabel:10'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
[0m[0;1;30m            2: [0m[1m[0;1;46msource_filename = "/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/test/CodeGen/ubsan-trap-merge.c" [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m            3: [0m[1m[0;1;46mtarget datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128" [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m            4: [0m[1m[0;1;46mtarget triple = "x86_64-unknown-linux-gnu" [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m            5: [0m[1m[0;1;46m [0m
[0;1;31mlabel:10'0     ~
[0m[0;1;30m            6: [0m[1m[0;1;46m; Function Attrs: nounwind [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m            7: [0m[1m[0;1;46mdefine dso_local range(i32 -2147483523, -2147483648) i32 @f(i32 noundef %x) local_unnamed_addr #0 { [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m            8: [0m[1m[0;1;46mentry: [0m
[0;1;31mlabel:10'0     ~~~~~~~
[0m[0;1;30m            9: [0m[1m[0;1;46m %0 = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %x, i32 125), !nosanitize !2 [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m           10: [0m[1m[0;1;46m %1 = extractvalue { i32, i1 } %0, 1, !nosanitize !2 [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m           11: [0m[1m[0;1;46m br i1 %1, label %trap, label %cont, !nosanitize !2 [0m
[0;1;31mlabel:10'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;30m           12: [0m[1m[0;1;46m [0m
[0;1;31mlabel:10'0     ~
[0m[0;1;30m           13: [0m[1m[0;1;46mtrap: ; preds = %entry [0m
...

```

</details>

https://github.com/llvm/llvm-project/pull/117649