clang/test/CodeGenCXX/static-destructor.cpp

   1 // RUN: %clang_cc1 %s -triple=x86_64-pc-linux -emit-llvm -o - | FileCheck --check-prefix=X86 %s
   2 // RUN: %clang_cc1 %s -triple=wasm32 -emit-llvm -o - | FileCheck --check-prefix=WASM %s
   3 // RUN: %clang_cc1 %s -triple=armv7-apple-darwin9 -emit-llvm -o - | FileCheck --check-prefix=ARM %s
   4
   5 // Test that destructors are not passed directly to __cxa_atexit when their
   6 // signatures do not match the type of its first argument.
   7 // e.g. ARM and WebAssembly have destructors that return this instead of void.
   8
   9
  10 class Foo {
  11  public:
  12   ~Foo() {
  13   }
  14 };
  15
  16 Foo global;
  17
  18 // X86 destructors have void return, and are registered directly with __cxa_atexit.
  19 // X86: define internal void @__cxx_global_var_init()
  20 // X86:   call i32 @__cxa_atexit(ptr @_ZN3FooD1Ev, ptr @global, ptr @__dso_handle)
  21
  22 // ARM destructors return this, but can be registered directly with __cxa_atexit
  23 // because the calling conventions tolerate the mismatch.
  24 // ARM: define internal void @__cxx_global_var_init()
  25 // ARM:   call i32 @__cxa_atexit(ptr @_ZN3FooD1Ev, ptr @global, ptr @__dso_handle)
  26
  27 // Wasm destructors return this, and use a wrapper function, which is registered
  28 // with __cxa_atexit.
  29 // WASM: define internal void @__cxx_global_var_init()
  30 // WASM: call i32 @__cxa_atexit(ptr @__cxx_global_array_dtor, ptr null, ptr @__dso_handle)
  31
  32 // WASM: define internal void @__cxx_global_array_dtor(ptr noundef %0)
  33 // WASM: %call = call noundef ptr @_ZN3FooD1Ev(ptr {{[^,]*}} @global)