clang/test/CodeGen/tbaa-cast.cpp

   1 // RUN: %clang_cc1 -triple x86_64-linux -O1 -disable-llvm-passes %s \
   2 // RUN:     -emit-llvm -o - | FileCheck %s -check-prefixes=CHECK,OLD-PATH
   3 // RUN: %clang_cc1 -triple x86_64-linux -O1 -disable-llvm-passes %s \
   4 // RUN:     -emit-llvm -new-struct-path-tbaa -o - | FileCheck %s -check-prefixes=CHECK,NEW-PATH
   5 //
   6 // Check that we generate correct TBAA information for lvalues constructed
   7 // with use of casts.
   8
   9 struct V {
  10   unsigned n;
  11 };
  12
  13 struct S {
  14   char bytes[4];
  15 };
  16
  17 void foo(S *p) {
  18 // CHECK-LABEL: _Z3fooP1S
  19 // CHECK: store i32 5, {{.*}}, !tbaa [[TAG_V_n:!.*]]
  20   ((V*)p->bytes)->n = 5;
  21 }
  22
  23 // OLD-PATH-DAG: [[TAG_V_n]] = !{[[TYPE_V:!.*]], [[TYPE_int:!.*]], i64 0}
  24 // OLD-PATH-DAG: [[TYPE_V]] = !{!"_ZTS1V", !{{.*}}, i64 0}
  25 // OLD-PATH-DAG: [[TYPE_int]] = !{!"int", !{{.*}}, i64 0}
  26 // NEW-PATH-DAG: [[TAG_V_n]] = !{[[TYPE_V:!.*]], [[TYPE_int:!.*]], i64 0, i64 4}
  27 // NEW-PATH-DAG: [[TYPE_V]] = !{[[TYPE_char:!.*]], i64 4, !"_ZTS1V", [[TYPE_int]], i64 0, i64 4}
  28 // NEW-PATH-DAG: [[TYPE_int]] = !{[[TYPE_char]], i64 4, !"int"}