[clang] [clang] Use the VFS to get the unique file ID (PR #160936)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Jan Svoboda (jansvoboda11)

<details>
<summary>Changes</summary>

This PR uses the VFS to get the unique file ID when printing externalized decls in CUDA instead of going straight to the real file system. This matches the behavior of other input files of the compiler.

---
Full diff: https://github.com/llvm/llvm-project/pull/160936.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CodeGenModule.cpp (+9-4) 


``````````diff
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 875f06b53f53d..f6f7f22a09004 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -8172,12 +8172,17 @@ void CodeGenModule::printPostfixForExternalizedDecl(llvm::raw_ostream &OS,
 
     // Get the UniqueID for the file containing the decl.
     llvm::sys::fs::UniqueID ID;
-    if (llvm::sys::fs::getUniqueID(PLoc.getFilename(), ID)) {
+    auto Status = FS->status(PLoc.getFilename());
+    if (!Status) {
       PLoc = SM.getPresumedLoc(D->getLocation(), /*UseLineDirectives=*/false);
       assert(PLoc.isValid() && "Source location is expected to be valid.");
-      if (auto EC = llvm::sys::fs::getUniqueID(PLoc.getFilename(), ID))
-        SM.getDiagnostics().Report(diag::err_cannot_open_file)
-            << PLoc.getFilename() << EC.message();
+      Status = FS->status(PLoc.getFilename());
+    }
+    if (!Status) {
+      SM.getDiagnostics().Report(diag::err_cannot_open_file)
+          << PLoc.getFilename() << Status.getError().message();
+    } else {
+      ID = Status->getUniqueID();
     }
     OS << llvm::format("%x", ID.getFile()) << llvm::format("%x", ID.getDevice())
        << "_" << llvm::utohexstr(Result.low(), /*LowerCase=*/true, /*Width=*/8);

``````````

</details>


https://github.com/llvm/llvm-project/pull/160936