[compiler-rt] [llvm] [ctxprof] Capture sampling info for context roots (PR #131201)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `compiler-rt,llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/7525

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: Transforms/PGOProfile/ctx-instrumentation.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/opt -passes=ctx-instr-gen -profile-context-root=an_entrypoint    -S < /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck --check-prefix=INSTRUMENT /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/opt -passes=ctx-instr-gen -profile-context-root=an_entrypoint -S
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck --check-prefix=INSTRUMENT /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll
RUN: at line 4: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/opt -passes=ctx-instr-gen,assign-guid,ctx-instr-lower -profile-context-root=an_entrypoint    -profile-context-root=another_entrypoint_no_callees    -S < /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck --check-prefix=LOWERING /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/opt -passes=ctx-instr-gen,assign-guid,ctx-instr-lower -profile-context-root=an_entrypoint -profile-context-root=another_entrypoint_no_callees -S
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck --check-prefix=LOWERING /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll:12:13: error: LOWERING: expected string not found in input
; LOWERING: @an_entrypoint_ctx_root = global { ptr, ptr, ptr, i8 } zeroinitializer
            ^
<stdin>:1:1: note: scanning from here
; ModuleID = '<stdin>'
^
<stdin>:4:1: note: possible intended match here
@an_entrypoint_ctx_root = global { ptr, ptr, ptr, i64, i8 } zeroinitializer
^
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll:42:81: error: undefined variable: GLOB0
; LOWERING-NEXT: [[TMP1:%.*]] = call ptr @__llvm_ctx_profile_get_context(ptr @[[GLOB0]], ptr @foo, i64 6699318081062747564, i32 2, i32 2)
                                                                                ^
<stdin>:17:2: note: possible intended match here
 %1 = call ptr @__llvm_ctx_profile_get_context(ptr @0, ptr @foo, i64 6699318081062747564, i32 2, i32 2)
 ^
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll:184:81: error: undefined variable: GLOB1
; LOWERING-NEXT: [[TMP1:%.*]] = call ptr @__llvm_ctx_profile_get_context(ptr @[[GLOB1]], ptr @simple, i64 -3006003237940970099, i32 1, i32 0)
                                                                                ^
<stdin>:103:2: note: possible intended match here
 %1 = call ptr @__llvm_ctx_profile_get_context(ptr @1, ptr @simple, i64 -3006003237940970099, i32 1, i32 0)
 ^
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll:208:81: error: undefined variable: GLOB2
; LOWERING-NEXT: [[TMP1:%.*]] = call ptr @__llvm_ctx_profile_get_context(ptr @[[GLOB2]], ptr @no_callsites, i64 5679753335911435902, i32 2, i32 0)
                                                                                ^
<stdin>:111:2: note: possible intended match here
 %1 = call ptr @__llvm_ctx_profile_get_context(ptr @2, ptr @no_callsites, i64 5679753335911435902, i32 2, i32 0)
 ^
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll:240:81: error: undefined variable: GLOB3
; LOWERING-NEXT: [[TMP1:%.*]] = call ptr @__llvm_ctx_profile_get_context(ptr @[[GLOB3]], ptr @no_counters, i64 5458232184388660970, i32 1, i32 1)
                                                                                ^
<stdin>:130:2: note: possible intended match here
 %1 = call ptr @__llvm_ctx_profile_get_context(ptr @3, ptr @no_counters, i64 5458232184388660970, i32 1, i32 1)
 ^
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll:268:81: error: undefined variable: GLOB4
; LOWERING-NEXT: [[TMP1:%.*]] = call ptr @__llvm_ctx_profile_get_context(ptr @[[GLOB4]], ptr @inlineasm, i64 -3771893999295659109, i32 1, i32 0)
                                                                                ^
<stdin>:147:2: note: possible intended match here
 %1 = call ptr @__llvm_ctx_profile_get_context(ptr @4, ptr @inlineasm, i64 -3771893999295659109, i32 1, i32 0)
 ^
...

```

</details>

https://github.com/llvm/llvm-project/pull/131201