[clang] [ExtractAPI] reorder the module names in extension symbol graph file names (PR #119925)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: QuietMisdreavus (QuietMisdreavus)

<details>
<summary>Changes</summary>

Resolves rdar://140298287

ExtractAPI's support for printing Objective-C category extensions from other modules emits symbol graphs with an `ExtendedModule@<!-- -->HostModule.symbols.json`. However, this is backwards from existing symbol graph practices, causing issues when these symbol graphs are consumed alongside symbol graphs generated with other tools like Swift. This PR flips the naming scheme to be in line with existing symbol graph tooling.

---
Full diff: https://github.com/llvm/llvm-project/pull/119925.diff


2 Files Affected:

- (modified) clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp (+2-2) 
- (modified) clang/test/ExtractAPI/objc_external_category.m (+8-1) 


``````````diff
diff --git a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
index c730c062b6a1d5..2c70e77b6246c6 100644
--- a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
+++ b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
@@ -1067,9 +1067,9 @@ void SymbolGraphSerializer::serializeWithExtensionGraphs(
 
   for (auto &ExtensionSGF : Serializer.ExtendedModules) {
     if (auto ExtensionOS =
-            CreateOutputStream(ExtensionSGF.getKey() + "@" + API.ProductName))
+            CreateOutputStream(API.ProductName + "@" + ExtensionSGF.getKey()))
       Serializer.serializeGraphToStream(*ExtensionOS, Options,
-                                        ExtensionSGF.getKey(),
+                                        API.ProductName,
                                         std::move(ExtensionSGF.getValue()));
   }
 }
diff --git a/clang/test/ExtractAPI/objc_external_category.m b/clang/test/ExtractAPI/objc_external_category.m
index 8afc92489f28b6..1947237d088e8f 100644
--- a/clang/test/ExtractAPI/objc_external_category.m
+++ b/clang/test/ExtractAPI/objc_external_category.m
@@ -46,7 +46,7 @@ @interface ExtInterface
 // Symbol graph from the build without extension SGFs should be identical to main symbol graph with extension SGFs
 // RUN: diff %t/symbols/Module.symbols.json %t/ModuleNoExt.symbols.json
 
-// RUN: FileCheck %s --input-file %t/symbols/ExternalModule at Module.symbols.json --check-prefix EXT
+// RUN: FileCheck %s --input-file %t/symbols/Module at ExternalModule.symbols.json --check-prefix EXT
 // EXT-DAG: "!testRelLabel": "memberOf $ c:objc(cs)ExtInterface(py)Property $ c:objc(cs)ExtInterface"
 // EXT-DAG: "!testRelLabel": "memberOf $ c:objc(cs)ExtInterface(im)InstanceMethod $ c:objc(cs)ExtInterface"
 // EXT-DAG: "!testRelLabel": "memberOf $ c:objc(cs)ExtInterface(cm)ClassMethod $ c:objc(cs)ExtInterface"
@@ -55,3 +55,10 @@ @interface ExtInterface
 // EXT-DAG: "!testLabel": "c:objc(cs)ExtInterface(cm)ClassMethod"
 // EXT-NOT: "!testLabel": "c:objc(cs)ExtInterface"
 // EXT-NOT: "!testLabel": "c:objc(cs)ModInterface"
+
+// Ensure that the 'module' metadata for the extension symbol graph should still reference the
+// declaring module
+
+// RUN: FileCheck %s --input-file %t/symbols/Module at ExternalModule.symbols.json --check-prefix META
+// META:       "module": {
+// META-NEXT:    "name": "Module",

``````````

</details>


https://github.com/llvm/llvm-project/pull/119925