[clang] [compiler-rt] [llvm] [openmp] [PGO][Offload] Profile profraw generation for GPU instrumentation #76587 (PR #93365)

[Johannes Doerfert via cfe-commits]

================
@@ -1274,4 +1277,97 @@ COMPILER_RT_VISIBILITY int __llvm_profile_set_file_object(FILE *File,
   return 0;
 }
 
+int __llvm_write_custom_profile(const char *Target,
+                                const __llvm_profile_data *DataBegin,
+                                const __llvm_profile_data *DataEnd,
+                                const char *CountersBegin,
+                                const char *CountersEnd, const char *NamesBegin,
+                                const char *NamesEnd) {
+  int ReturnValue = 0, FilenameLength, TargetLength;
+  char *FilenameBuf, *TargetFilename;
+  const char *Filename;
+
+  /* Save old profile data */
+  FILE *oldFile = getProfileFile();
+
+  // Temporarily suspend getting SIGKILL when the parent exits.
+  int PDeathSig = lprofSuspendSigKill();
+
+  if (lprofProfileDumped() || __llvm_profile_is_continuous_mode_enabled()) {
+    PROF_NOTE("Profile data not written to file: %s.\n", "already written");
+    if (PDeathSig == 1)
+      lprofRestoreSigKill();
+    return 0;
+  }
+
+  /* Get current filename */
+  FilenameLength = getCurFilenameLength();
+  FilenameBuf = (char *)COMPILER_RT_ALLOCA(FilenameLength + 1);
+  Filename = getCurFilename(FilenameBuf, 0);
+
+  /* Check the filename. */
+  if (!Filename) {
+    PROF_ERR("Failed to write file : %s\n", "Filename not set");
+    if (PDeathSig == 1)
+      lprofRestoreSigKill();
+    return -1;
+  }
+
+  /* Allocate new space for our target-specific PGO filename */
+  TargetLength = strlen(Target);
+  TargetFilename =
+      (char *)COMPILER_RT_ALLOCA(FilenameLength + TargetLength + 2);
+
+  /* Prepend "TARGET." to current filename */
+  memcpy(TargetFilename, Target, TargetLength);
+  TargetFilename[TargetLength] = '.';
+  memcpy(TargetFilename, Target, TargetLength);
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jdoerfert wrote:

2 times the same memcpy?

https://github.com/llvm/llvm-project/pull/93365