[Profile] Dump binary id to raw profiles on Windows. (#75618)

#74652 adds `__buildid` symbol which allows us to dump it at runtime.

compiler-rt/lib/profile/InstrProfilingPlatformWindows.c

@@ -74,7 +74,17 @@ ValueProfNode *__llvm_profile_end_vnodes(void) { return &VNodesEnd; }
 ValueProfNode *CurrentVNode = &VNodesStart + 1;
 ValueProfNode *EndVNode = &VNodesEnd;
 
+/* lld-link provides __buildid symbol which ponits to the 16 bytes build id when
+ * using /build-id flag. https://lld.llvm.org/windows_support.html#lld-flags */
+#define BUILD_ID_LEN 16
+COMPILER_RT_WEAK extern uint8_t __buildid[BUILD_ID_LEN];
 COMPILER_RT_VISIBILITY int __llvm_write_binary_ids(ProfDataWriter *Writer) {
+  if (*__buildid) {
+    if (Writer &&
+        lprofWriteOneBinaryId(Writer, BUILD_ID_LEN, __buildid, 0) == -1)
+      return -1;
+    return sizeof(uint64_t) + BUILD_ID_LEN;
+  }
   return 0;
 }
 

compiler-rt/test/profile/Windows/binary-id.c

@@ -0,0 +1,82 @@
+// REQUIRES: target={{.*windows-msvc.*}}
+// REQUIRES: lld-available
+
+// RUN: %clang_profgen -O2 -o %t %s
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t
+// RUN: llvm-profdata show --binary-ids %t.profraw > %t.out
+// RUN: FileCheck %s --check-prefix=NO-BINARY-ID < %t.out
+// RUN: llvm-profdata merge -o %t.profdata %t.profraw
+
+// RUN: %clang_profgen -fuse-ld=lld -Wl,-build-id -O2 -o %t %s
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t
+// RUN: llvm-profdata show --binary-ids %t.profraw > %t.profraw.out
+// RUN: FileCheck %s --check-prefix=BINARY-ID-RAW-PROF < %t.profraw.out
+
+// RUN: rm -rf %t.profdir
+// RUN: env LLVM_PROFILE_FILE=%t.profdir/default_%m.profraw %run %t
+// RUN: env LLVM_PROFILE_FILE=%t.profdir/default_%m.profraw %run %t
+// RUN: env LLVM_PROFILE_FILE=%t.profdir/default_%m.profraw %run %t
+// RUN: llvm-profdata show --binary-ids  %t.profdir/default_*.profraw > %t.profraw.out
+// RUN: FileCheck %s --check-prefix=ONE-BINARY-ID < %t.profraw.out
+
+// RUN: llvm-profdata merge -o %t.profdata %t.profdir/default_*.profraw
+// RUN: llvm-profdata show --binary-ids %t.profdata > %t.profdata.out
+// RUN: FileCheck %s --check-prefix=ONE-BINARY-ID < %t.profdata.out
+
+// Test raw profiles with DLLs.
+// RUN: rm -rf %t.dir && split-file %s %t.dir
+// RUN: %clang_profgen -O2 %t.dir/foo.c -fuse-ld=lld -Wl,-build-id -Wl,-dll -o %t.dir/foo.dll
+// RUN: %clang_profgen -O2 %t.dir/bar.c -fuse-ld=lld -Wl,-build-id -Wl,-dll -o %t.dir/bar.dll
+// RUN: %clang_profgen -O2 %t.dir/main.c -fuse-ld=lld -Wl,-build-id %t.dir/foo.lib %t.dir/bar.lib -o %t.dir/main.exe
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t.dir/main.exe
+// RUN: llvm-profdata show --binary-ids %t.profraw > %t.profraw.out
+// RUN: llvm-profdata merge -o %t.profdata %t.profraw
+// RUN: FileCheck %s --check-prefix=MULTI-BINARY-ID < %t.profraw.out
+
+// RUN: llvm-profdata merge -o %t.profdata %t.profraw
+// RUN: llvm-profdata show --binary-ids %t.profdata > %t.profdata.out
+// RUN: FileCheck %s --check-prefix=MULTI-BINARY-ID < %t.profraw.out
+
+//--- foo.c
+__declspec(dllexport) void foo() {}
+
+//--- bar.c
+__declspec(dllexport) void bar() {}
+
+//--- main.c
+__declspec(dllimport) void foo();
+__declspec(dllimport) void bar();
+int main() {
+  foo();
+  bar();
+  return 0;
+}
+
+// NO-BINARY-ID: Instrumentation level: Front-end
+// NO-BINARY-ID-NEXT: Total functions: 3
+// NO-BINARY-ID-NEXT: Maximum function count: 1
+// NO-BINARY-ID-NEXT: Maximum internal block count: 0
+// NO-BINARY-ID-NOT: Binary IDs:
+
+// BINARY-ID-RAW-PROF: Instrumentation level: Front-end
+// BINARY-ID-RAW-PROF-NEXT: Total functions: 3
+// BINARY-ID-RAW-PROF-NEXT: Maximum function count: 1
+// BINARY-ID-RAW-PROF-NEXT: Maximum internal block count: 0
+// BINARY-ID-RAW-PROF-NEXT: Binary IDs:
+// BINARY-ID-RAW-PROF-NEXT: {{[0-9a-f]+}}
+
+// ONE-BINARY-ID: Instrumentation level: Front-end
+// ONE-BINARY-ID-NEXT: Total functions: 3
+// ONE-BINARY-ID-NEXT: Maximum function count: 3
+// ONE-BINARY-ID-NEXT: Maximum internal block count: 0
+// ONE-BINARY-ID-NEXT: Binary IDs:
+// ONE-BINARY-ID-NEXT: {{[0-9a-f]+}}
+
+// MULTI-BINARY-ID: Instrumentation level: Front-end
+// MULTI-BINARY-ID-NEXT: Total functions: 3
+// MULTI-BINARY-ID-NEXT: Maximum function count: 1
+// MULTI-BINARY-ID-NEXT: Maximum internal block count: 0
+// MULTI-BINARY-ID-NEXT: Binary IDs:
+// MULTI-BINARY-ID-NEXT: {{[0-9a-f]+}}
+// MULTI-BINARY-ID-NEXT: {{[0-9a-f]+}}
+// MULTI-BINARY-ID-NEXT: {{[0-9a-f]+}}