clang/test/CodeGenCXX/ctor-globalopt.cpp

   1 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s
   2 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s -O2 | opt - -S -globalopt -o - | FileCheck %s --check-prefix=O1
   3 // RUN: %clang_cc1 -triple %ms_abi_triple -emit-llvm -o - %s | FileCheck %s
   4 // RUN: %clang_cc1 -triple %ms_abi_triple -emit-llvm -o - %s -O2 | opt - -S -globalopt -o - | FileCheck %s --check-prefix=O1
   5
   6 // Check that GlobalOpt can eliminate static constructors for simple implicit
   7 // constructors. This is a targeted integration test to make sure that LLVM's
   8 // optimizers are able to process Clang's IR. GlobalOpt in particular is
   9 // sensitive to the casts we emit.
  10
  11 // CHECK: @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }]
  12 // CHECK: [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_ctor_globalopt.cpp, i8* null }]
  13
  14 // CHECK-LABEL: define internal {{.*}}void @_GLOBAL__sub_I_ctor_globalopt.cpp()
  15 // CHECK: call {{.*}}void @
  16 // CHECK-NOT: call{{ }}
  17
  18 // O1: @llvm.global_ctors = appending global [0 x { i32, void ()*, i8* }] zeroinitializer
  19
  20 struct A {
  21   virtual void f();
  22   int a;
  23 };
  24 struct B : virtual A {
  25   virtual void g();
  26   int b;
  27 };
  28 B b;