[NFC][CodeGen][CFI] Pre-commit transparent_union tests (#158192)

For #158193

Author: vitalybuka

clang/test/CodeGen/cfi-icall-generalize.c

@@ -15,5 +15,21 @@ void g(int** (*fp)(const char *, const char **)) {
   fp(0, 0);
 }
 
+union Union {
+  char *c;
+  long *n;
+} __attribute__((transparent_union));
+
+// CHECK: define{{.*}} void @uni({{.*}} !type [[TYPE2:![0-9]+]] !type [[TYPE2_GENERALIZED:![0-9]+]]
+void uni(void (*fn)(union Union), union Union arg1) {
+  // UNGENERALIZED: call i1 @llvm.type.test(ptr {{.*}}, metadata !"_ZTSFv5UnionE")
+  // GENERALIZED: call i1 @llvm.type.test(ptr {{.*}}, metadata !"_ZTSFv5UnionE.generalized")
+    fn(arg1);
+}
+
 // CHECK: [[TYPE]] = !{i64 0, !"_ZTSFPPiPKcPS2_E"}
 // CHECK: [[TYPE_GENERALIZED]] = !{i64 0, !"_ZTSFPvPKvS_E.generalized"}
+
+// CHECK: [[TYPE2]] = !{i64 0, !"_ZTSFvPFv5UnionES_E"}
+// CHECK: [[TYPE2_GENERALIZED]] = !{i64 0, !"_ZTSFvPv5UnionE.generalized"}
+

clang/test/CodeGen/cfi-icall-normalize2.c

@@ -24,6 +24,20 @@ void baz(void (*fn)(int, int, int), int arg1, int arg2, int arg3) {
     fn(arg1, arg2, arg3);
 }
 
+union Union {
+  char *c;
+  long *n;
+} __attribute__((transparent_union));
+
+void uni(void (*fn)(union Union), union Union arg1) {
+    // CHECK-LABEL: define{{.*}}uni
+    // CHECK-SAME: {{.*}}!type ![[TYPE4:[0-9]+]] !type !{{[0-9]+}}
+    // CHECK: call i1 @llvm.type.test({{i8\*|ptr}} {{%f|%0}}, metadata !"_ZTSFv5UnionE.normalized")
+    fn(arg1);
+}
+
 // CHECK: ![[TYPE1]] = !{i64 0, !"_ZTSFvPFvu3i32ES_E.normalized"}
 // CHECK: ![[TYPE2]] = !{i64 0, !"_ZTSFvPFvu3i32S_ES_S_E.normalized"}
 // CHECK: ![[TYPE3]] = !{i64 0, !"_ZTSFvPFvu3i32S_S_ES_S_S_E.normalized"}
+// CHECK: ![[TYPE4]] = !{i64 0, !"_ZTSFvPFv5UnionES_E.normalized"}
+

clang/test/CodeGen/kcfi-generalize.c

@@ -26,8 +26,24 @@ void g(int** (*fp)(const char *, const char **)) {
   fp(0, 0);
 }
 
+union Union {
+  char *c;
+  long *n;
+} __attribute__((transparent_union));
+
+// CHECK: define{{.*}} void @uni({{.*}} !kcfi_type [[TYPE4:![0-9]+]]
+void uni(void (*fn)(union Union), union Union arg1) {
+  // UNGENERALIZED: call {{.*}} [ "kcfi"(i32 -1037059548) ]
+  // GENERALIZED: call {{.*}} [ "kcfi"(i32 422130955) ]
+    fn(arg1);
+}
+
 // UNGENERALIZED: [[TYPE]] = !{i32 1296635908}
 // GENERALIZED: [[TYPE]] = !{i32 -49168686}
 
 // UNGENERALIZED: [[TYPE3]] = !{i32 874141567}
 // GENERALIZED: [[TYPE3]] = !{i32 954385378}
+
+// UNGENERALIZED: [[TYPE4]] = !{i32 981319178}
+// GENERALIZED: [[TYPE4]] = !{i32 -1599950473}
+

clang/test/CodeGen/kcfi-normalize.c

@@ -28,7 +28,21 @@ void baz(void (*fn)(int, int, int), int arg1, int arg2, int arg3) {
     fn(arg1, arg2, arg3);
 }
 
+union Union {
+  char *c;
+  long *n;
+} __attribute__((transparent_union));
+
+void uni(void (*fn)(union Union), union Union arg1) {
+    // CHECK-LABEL: define{{.*}}uni
+    // CHECK-SAME: {{.*}}!kcfi_type ![[TYPE4:[0-9]+]]
+    // CHECK: call void %0(ptr %1) [ "kcfi"(i32 -1430221633) ]
+    fn(arg1);
+}
+
 // CHECK: ![[#]] = !{i32 4, !"cfi-normalize-integers", i32 1}
 // CHECK: ![[TYPE1]] = !{i32 -1143117868}
 // CHECK: ![[TYPE2]] = !{i32 -460921415}
 // CHECK: ![[TYPE3]] = !{i32 -333839615}
+// CHECK: ![[TYPE4]] = !{i32 1766237188}
+