[llvm-branch-commits] [llvm] [openmp] [OpenMP] Implement omp_get_uid_from_device() / omp_get_device_from_uid() (PR #164392)

[Robert Imschweiler via llvm-branch-commits]

================
@@ -91,6 +93,61 @@ EXTERN int omp_get_device_num(void) {
   return HostDevice;
 }
 
+static inline bool is_initial_device_uid(const char *DeviceUid) {
+  return strcmp(DeviceUid, GenericPluginTy::getInitialDeviceUid()) == 0;
+}
+
+EXTERN int omp_get_device_from_uid(const char *DeviceUid) {
+  TIMESCOPE();
+  OMPT_IF_BUILT(ReturnAddressSetterRAII RA(__builtin_return_address(0)));
+
+  if (!DeviceUid) {
+    DP("Call to omp_get_device_from_uid returning omp_invalid_device\n");
+    return omp_invalid_device;
+  }
+  if (is_initial_device_uid(DeviceUid)) {
+    DP("Call to omp_get_device_from_uid returning initial device number %d\n",
+       omp_get_initial_device());
+    return omp_get_initial_device();
+  }
+
+  int DeviceNum = omp_invalid_device;
+
+  auto ExclusiveDevicesAccessor = PM->getExclusiveDevicesAccessor();
+  for (const DeviceTy &Device : PM->devices(ExclusiveDevicesAccessor)) {
+    const char *Uid = Device.RTL->getDeviceUid(Device.RTLDeviceID);
+    if (Uid && strcmp(DeviceUid, Uid) == 0) {
+      DeviceNum = Device.DeviceID;
+      break;
+    }
+  }
+
+  DP("Call to omp_get_device_from_uid returning %d\n", DeviceNum);
+  return DeviceNum;
+}
+
+EXTERN const char *omp_get_uid_from_device(int DeviceNum) {
+  TIMESCOPE();
+  OMPT_IF_BUILT(ReturnAddressSetterRAII RA(__builtin_return_address(0)));
+
+  if (DeviceNum == omp_invalid_device) {
+    DP("Call to omp_get_uid_from_device returning nullptr\n");
+    return nullptr;
+  }
+  if (DeviceNum == omp_get_initial_device()) {
+    DP("Call to omp_get_uid_from_device returning initial device UID\n");
+    return GenericPluginTy::getInitialDeviceUid();
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ro-i wrote:

Libomptarget isn't available for offload-info etc. tho

I previously called this function getHostDeviceUid, but then thought that this naming might clash with the fact that there are these other virtual host devices.
But idk, I can rename it to getHostDeviceUid or getHostUid again.

https://github.com/llvm/llvm-project/pull/164392