[libclang] Introduce clang_findReferencesInFile which accepts a cursor, a file,
and a callback and finds all identifier references of the cursor in the file.

rdar://7948304

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141277 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Index/file-refs.cpp b/test/Index/file-refs.cpp
new file mode 100644
index 0000000..a96d27c
--- /dev/null
+++ b/test/Index/file-refs.cpp
@@ -0,0 +1,104 @@
+namespace NS {
+  class C {
+  public:
+    C() { }
+    void m();
+  };
+}
+
+void NS::C::m() {
+  C c;
+  c.m();
+}
+
+void f() {
+  NS::C c1();
+  NS::C c2 = NS::C();
+}
+
+void over(int);
+void over(float);
+
+void test_over() {
+  over(0);
+  over(0.0f);
+}
+
+template <typename T>
+T tf(T t) {
+  return t;
+}
+
+namespace Test2 {
+
+struct S {
+  S(int x, int y);
+  S();
+};
+
+typedef S Cake;
+
+void f() {
+  Cake p;
+  p = Test2::S(0,2);
+  p = Test2::Cake(0,2);
+}
+
+}
+
+// RUN: c-index-test \
+
+// RUN:  -file-refs-at=%s:9:7 \
+// CHECK:      NamespaceRef=NS:1:11
+// CHECK-NEXT: Namespace=NS:1:11 (Definition) =[1:11 - 1:13]
+// CHECK-NEXT: NamespaceRef=NS:1:11 =[9:6 - 9:8]
+// CHECK-NEXT: NamespaceRef=NS:1:11 =[15:3 - 15:5]
+// CHECK-NEXT: NamespaceRef=NS:1:11 =[16:3 - 16:5]
+// CHECK-NEXT: NamespaceRef=NS:1:11 =[16:14 - 16:16]
+
+// RUN:  -file-refs-at=%s:2:9 \
+// CHECK-NEXT: ClassDecl=C:2:9 (Definition)
+// CHECK-NEXT: ClassDecl=C:2:9 (Definition) =[2:9 - 2:10]
+// CHECK-NEXT: CXXConstructor=C:4:5 (Definition) =[4:5 - 4:6]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[9:10 - 9:11]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[10:3 - 10:4]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[15:7 - 15:8]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[16:7 - 16:8]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[16:18 - 16:19]
+
+// RUN:  -file-refs-at=%s:16:18 \
+// CHECK-NEXT: CallExpr=C:4:5
+// CHECK-NEXT: ClassDecl=C:2:9 (Definition) =[2:9 - 2:10]
+// CHECK-NEXT: CXXConstructor=C:4:5 (Definition) =[4:5 - 4:6]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[9:10 - 9:11]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[10:3 - 10:4]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[15:7 - 15:8]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[16:7 - 16:8]
+// CHECK-NEXT: TypeRef=class NS::C:2:9 =[16:18 - 16:19]
+
+// RUN:  -file-refs-at=%s:20:8 \
+// CHECK-NEXT: FunctionDecl=over:20:6
+// CHECK-NEXT: FunctionDecl=over:20:6 =[20:6 - 20:10]
+// CHECK-NEXT: DeclRefExpr=over:20:6 =[24:3 - 24:7]
+
+// RUN:  -file-refs-at=%s:28:1 \
+// CHECK-NEXT: TypeRef=T:27:20
+// FIXME: Missing TemplateTypeParameter=T:27:20 (Definition)
+// CHECK-NEXT: TypeRef=T:27:20 =[28:1 - 28:2]
+// CHECK-NEXT: TypeRef=T:27:20 =[28:6 - 28:7]
+
+// RUN:  -file-refs-at=%s:43:14 \
+// CHECK-NEXT: CallExpr=S:35:3
+// CHECK-NEXT: StructDecl=S:34:8 (Definition) =[34:8 - 34:9]
+// CHECK-NEXT: CXXConstructor=S:35:3 =[35:3 - 35:4]
+// CHECK-NEXT: CXXConstructor=S:36:3 =[36:3 - 36:4]
+// CHECK-NEXT: TypeRef=struct Test2::S:34:8 =[39:9 - 39:10]
+// CHECK-NEXT: TypeRef=struct Test2::S:34:8 =[43:14 - 43:15]
+
+// RUN:  -file-refs-at=%s:44:16 \
+// CHECK-NEXT: CallExpr=S:35:3
+// CHECK-NEXT: TypedefDecl=Cake:39:11 (Definition) =[39:11 - 39:15]
+// CHECK-NEXT: TypeRef=Cake:39:11 =[42:3 - 42:7]
+// CHECK-NEXT: TypeRef=Cake:39:11 =[44:14 - 44:18]
+
+// RUN:   %s | FileCheck %s