[libclang][Dependency Scanning] Implementing C-APIs to Report a Module's Link Libraries

clang/include/clang-c/Dependencies.h

@@ -733,6 +733,55 @@ CINDEX_LINKAGE enum CXErrorCode
 clang_experimental_DependencyScanner_generateReproducer(
     CXDependencyScannerReproducerOptions CXOptions, CXString *MessageOut);
 
+/**
+ * An opaque object that contains a \c CXDepGraphModule 'st link library
+ * information.
+ */
+typedef struct CXOpaqueDepGraphModuleLinkLibrarySet
+    *CXDepGraphModuleLinkLibrarySet;
+
+/**
+ * An opaque object that contains information about a link library.
+ */
+typedef struct CXOpaqueDepGraphModuleLinkLibrary *CXDepGraphModuleLinkLibrary;
+
+/**
+ * Get the set of link libraries given a \c CXDepGraphModule intance.
+ * The returned set is a pointer into memory that \c CXDepGraphModule
+ * owns. Therefore the set does not need to be disposed.
+ */
+CINDEX_LINKAGE CXDepGraphModuleLinkLibrarySet
+    clang_experimental_DepGraphModule_getLinkLibrarySet(CXDepGraphModule);
+
+/**
+ * Get the size of \c CXDepGraphModuleLinkLibrarySet .
+ */
+CINDEX_LINKAGE size_t clang_experimental_DepGraphModuleLinkLibrarySet_getSize(
+    CXDepGraphModuleLinkLibrarySet);
+
+/**
+ * Retrieve the \c CXDepGraphModuleLinkLibrary at index \p Idx from \c
+ * CXDepGraphModuleLinkLibrarySet .
+ */
+CINDEX_LINKAGE CXDepGraphModuleLinkLibrary
+clang_experimental_DepGraphModuleLinkLibrarySet_getLinkLibrary(
+    CXDepGraphModuleLinkLibrarySet, size_t Idx);
+
+/**
+ *  Get the `Library` string from the \c CXDepGraphModuleLinkLibrary.
+ *  `Library` could be the library name, or an absolute path to a library or a
+ * framework.
+ */
+CINDEX_LINKAGE CXString clang_experimental_DepGraphModuleLinkLibrary_getLibrary(
+    CXDepGraphModuleLinkLibrary);
+
+/**
+ * Returns true if the \c CXDepGraphModuleLinkLibrary is a framework, false
+ * otherwise.
+ */
+CINDEX_LINKAGE bool clang_experimental_DepGraphModuleLinkLibrary_isFramework(
+    CXDepGraphModuleLinkLibrary);
+
 /**
  * @}
  */

clang/test/Index/Core/Inputs/module/module.modulemap

@@ -8,4 +8,7 @@ module ModA {
       header "SubSubModA.h"
     }
   }
+
+  link framework "libModA"
+  link "libModB"
 }

clang/test/Index/Core/scan-deps-by-mod-name.m

@@ -21,6 +21,9 @@
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/ModA.h
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/SubModA.h
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/SubSubModA.h
+// CHECK-NEXT:     link libraries:
+// CHECK-NEXT:         libModA(framework)
+// CHECK-NEXT:         libModB
 // CHECK-NEXT:     build-args: {{.*}} -emit-module {{.*}} -fmodule-name=ModA {{.*}} -fno-implicit-modules {{.*}}
 // CHECK-NEXT: dependencies:
 // CHECK-NEXT:   command 0:

clang/test/Index/Core/scan-deps-cas.m

@@ -44,6 +44,9 @@
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/ModA.h
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/SubModA.h
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/SubSubModA.h
+// CHECK-NEXT:     link libraries:
+// CHECK-NEXT:         libModA(framework)
+// CHECK-NEXT:         libModB
 // CHECK-NEXT:     build-args:
 // CHECK-SAME:       -cc1
 // CHECK-SAME:       -fcas-path
@@ -85,6 +88,9 @@
 // INCLUDE_TREE-NEXT:       [[PREFIX]]/Inputs/module/ModA.h
 // INCLUDE_TREE-NEXT:       [[PREFIX]]/Inputs/module/SubModA.h
 // INCLUDE_TREE-NEXT:       [[PREFIX]]/Inputs/module/SubSubModA.h
+// INCLUDE_TREE-NEXT:     link libraries:
+// INCLUDE_TREE-NEXT:         libModA(framework)
+// INCLUDE_TREE-NEXT:         libModB
 // INCLUDE_TREE-NEXT:     build-args:
 // INCLUDE_TREE-SAME:       -cc1
 // INCLUDE_TREE-SAME:       -fcas-path

clang/test/Index/Core/scan-deps.m

@@ -29,6 +29,9 @@
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/ModA.h
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/SubModA.h
 // CHECK-NEXT:       [[PREFIX]]/Inputs/module/SubSubModA.h
+// CHECK-NEXT:     link libraries:
+// CHECK-NEXT:         libModA(framework)
+// CHECK-NEXT:         libModB
 // CHECK-NEXT:     build-args: {{.*}} -emit-module {{.*}} -fmodule-name=ModA {{.*}} -fno-implicit-modules {{.*}}
 
 // CHECK-NEXT: dependencies:

clang/tools/c-index-test/core_main.cpp

@@ -870,6 +870,25 @@ static int scanDeps(ArrayRef<const char *> Args, std::string WorkingDirectory,
         // (mostly) platform-agnostic.
         if (!StringRef(FileName).ends_with("SDKSettings.json"))
           llvm::outs() << "      " << FileName << "\n";
+      CXDepGraphModuleLinkLibrarySet LinkLibs =
+          clang_experimental_DepGraphModule_getLinkLibrarySet(Mod);
+      size_t NumLinkLibs =
+          clang_experimental_DepGraphModuleLinkLibrarySet_getSize(LinkLibs);
+      if (NumLinkLibs) {
+        llvm::outs() << "    link libraries:\n";
+        for (size_t Idx = 0; Idx < NumLinkLibs; Idx++) {
+          CXDepGraphModuleLinkLibrary Lib =
+              clang_experimental_DepGraphModuleLinkLibrarySet_getLinkLibrary(
+                  LinkLibs, Idx);
+          CXString Library =
+              clang_experimental_DepGraphModuleLinkLibrary_getLibrary(Lib);
+          int IsFramework =
+              clang_experimental_DepGraphModuleLinkLibrary_isFramework(Lib);
+          const char *IsFrameworkStr = IsFramework ? "(framework)" : "";
+          llvm::outs() << "        " << clang_getCString(Library)
+                       << IsFrameworkStr << "\n";
+        }
+      }
       llvm::outs() << "    build-args:";
       for (const auto &Arg :
            ArrayRef(BuildArguments.Strings, BuildArguments.Count))

clang/tools/libclang/CDependencies.cpp

@@ -882,3 +882,45 @@ enum CXErrorCode clang_experimental_DependencyScanner_generateReproducer(
             "located at:\n  "
          << FileCachePath << "\n  " << ReproScriptPath;
 }
+
+namespace {
+typedef llvm::SmallVectorImpl<clang::Module::LinkLibrary>
+    DepGraphModuleLinkLibrarySet;
+typedef clang::Module::LinkLibrary DepGraphModuleLinkLibrary;
+} // namespace
+
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(DepGraphModuleLinkLibrarySet,
+                                   CXDepGraphModuleLinkLibrarySet)
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(DepGraphModuleLinkLibrary,
+                                   CXDepGraphModuleLinkLibrary)
+
+CXDepGraphModuleLinkLibrarySet
+clang_experimental_DepGraphModule_getLinkLibrarySet(CXDepGraphModule CXDepMod) {
+  const ModuleDeps &ModDeps = *unwrap(CXDepMod)->ModDeps;
+  return wrap(&ModDeps.LinkLibraries);
+}
+
+size_t clang_experimental_DepGraphModuleLinkLibrarySet_getSize(
+    CXDepGraphModuleLinkLibrarySet S) {
+  const DepGraphModuleLinkLibrarySet *LinkLibraries = unwrap(S);
+  return LinkLibraries->size();
+}
+
+CXDepGraphModuleLinkLibrary
+clang_experimental_DepGraphModuleLinkLibrarySet_getLinkLibrary(
+    CXDepGraphModuleLinkLibrarySet S, size_t Idx) {
+  const DepGraphModuleLinkLibrarySet *LinkLibraries = unwrap(S);
+  return wrap(&(*LinkLibraries)[Idx]);
+}
+
+CXString clang_experimental_DepGraphModuleLinkLibrary_getLibrary(
+    CXDepGraphModuleLinkLibrary L) {
+  const DepGraphModuleLinkLibrary *Lib = unwrap(L);
+  return cxstring::createRef(Lib->Library.c_str());
+}
+
+bool clang_experimental_DepGraphModuleLinkLibrary_isFramework(
+    CXDepGraphModuleLinkLibrary L) {
+  const DepGraphModuleLinkLibrary *Lib = unwrap(L);
+  return Lib->IsFramework;
+}

clang/tools/libclang/libclang.map

@@ -597,6 +597,11 @@ LLVM_21 {
     clang_experimental_DepScanFSCacheOutOfDateEntry_getCachedSize;
     clang_experimental_DepScanFSCacheOutOfDateEntry_getActualSize;
     clang_experimental_DepScanFSCacheOutOfDateEntrySet_disposeSet;
+    clang_experimental_DepGraphModule_getLinkLibrarySet;
+    clang_experimental_DepGraphModuleLinkLibrarySet_getSize;
+    clang_experimental_DepGraphModuleLinkLibrarySet_getLinkLibrary;
+    clang_experimental_DepGraphModuleLinkLibrary_getLibrary;
+    clang_experimental_DepGraphModuleLinkLibrary_isFramework;
 };
 
 # Example of how to add a new symbol version entry.  If you do add a new symbol