[llvm] [clang]{OpenMP] Fix bug #62099 - use hash value when inode ID cannot be determined (PR #131646)

[Michael Klemm via llvm-commits]

https://github.com/mjklemm created https://github.com/llvm/llvm-project/pull/131646

When creating the name of an outlined region, Clang uses the file's inode ID to generate a unique name.  When the file does not exist, this causes a fatal abort of the compiler.  This PR switches to a has value that is used instead.

>From 30a7f0ce492ce2e4a634d017721c44f042bd0b2a Mon Sep 17 00:00:00 2001
From: Michael Klemm <michael.klemm at amd.com>
Date: Mon, 17 Mar 2025 18:18:09 +0100
Subject: [PATCH] Fix bug #62099

When creating the name of an outlined region, Clang uses the file's
inode ID to generate a unique name.  When the file does not exist, this
causes a fatal abort of the compiler.  This PR switches to a has value
that is used instead.
---
 llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp b/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
index 8dcebcdb8791d..dacbc00ec7819 100644
--- a/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
+++ b/llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
@@ -9577,14 +9577,18 @@ OpenMPIRBuilder::getTargetEntryUniqueInfo(FileIdentifierInfoCallbackTy CallBack,
                                           StringRef ParentName) {
   sys::fs::UniqueID ID;
   auto FileIDInfo = CallBack();
-  if (auto EC = sys::fs::getUniqueID(std::get<0>(FileIDInfo), ID)) {
-    report_fatal_error(("Unable to get unique ID for file, during "
-                        "getTargetEntryUniqueInfo, error message: " +
-                        EC.message())
-                           .c_str());
+  uint64_t FileID{0};
+  auto EC = sys::fs::getUniqueID(std::get<0>(FileIDInfo), ID);
+  if (EC) {
+    // The inode ID could not be determined, so create a hash value
+    // the current file name and use that as an ID.
+    FileID = hash_value(FileIDInfo);
+  }
+  else {
+    FileID = ID.getFile();
   }
 
-  return TargetRegionEntryInfo(ParentName, ID.getDevice(), ID.getFile(),
+  return TargetRegionEntryInfo(ParentName, ID.getDevice(), FileID,
                                std::get<1>(FileIDInfo));
 }