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llvm-project/clang/test/CodeGenCXX/aix-static-init-temp-spec-and-inline-var.cpp
Tom Honermann 3e25ae605e [Clang] Correct when Itanium ABI guard variables are set for non-block variables with static or thread storage duration. 
Previously, Itanium ABI guard variables were set after initialization was
complete for non-block declared variables with static and thread storage
duration. That resulted in initialization of such variables being restarted
in cases where the variable was referenced while it was still under
construction. Per C++20 [class.cdtor]p2, such references are permitted
(though the value obtained by such an access is unspecified). The late
initialization resulted in recursive reinitialization loops for cases like
this:
  template<typename T>
  struct ct {
    struct mc {
      mc() { ct<T>::smf(); }
      void mf() const {}
    };
    thread_local static mc tlsdm;
    static void smf() { tlsdm.mf(); }
  };
  template<typename T>
  thread_local typename ct<T>::mc ct<T>::tlsdm;
  int main() {
    ct<int>::smf();
  }

With this change, guard variables are set before initialization is started
so as to avoid such reinitialization loops.

Fixes https://github.com/llvm/llvm-project/issues/57828

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D135919
2022-11-16 16:31:35 -05:00

236 lines
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// RUN: %clang_cc1 -triple powerpc-ibm-aix-xcoff -S -emit-llvm -x c++ \
// RUN: -std=c++2a < %s | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK32 %s
// RUN: %clang_cc1 -triple powerpc64-ibm-aix-xcoff -S -emit-llvm -x c++ \
// RUN: -std=c++2a < %s | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK64 %s
namespace test1 {
struct Test1 {
Test1(int) {}
~Test1() {}
};
Test1 t0 = 2;
template <typename T>
Test1 t1 = 2;
inline Test1 t2 = 2;
void foo() {
(void)&t1<int>;
}
} // namespace test1
namespace test2 {
template <typename = void>
struct A {
A() {}
~A() {}
static A instance;
};
template <typename T>
A<T> A<T>::instance;
template A<> A<>::instance;
A<int> &bar() {
A<int> *a = new A<int>;
return *a;
}
template <>
A<int> A<int>::instance = bar();
} // namespace test2
// CHECK: @_ZGVN5test12t2E = linkonce_odr global i64 0, align 8
// CHECK: @_ZGVN5test21AIvE8instanceE = weak_odr global i64 0, align 8
// CHECK: @_ZGVN5test12t1IiEE = linkonce_odr global i64 0, align 8
// CHECK: @llvm.global_ctors = appending global [4 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 65535, ptr @__cxx_global_var_init.1, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @__cxx_global_var_init.2, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @__cxx_global_var_init.4, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @_GLOBAL__sub_I__, ptr null }]
// CHECK: @llvm.global_dtors = appending global [4 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 65535, ptr @__finalize__ZN5test12t2E, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @__finalize__ZN5test21AIvE8instanceE, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @__finalize__ZN5test12t1IiEE, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @_GLOBAL__D_a, ptr null }]
// CHECK: define internal void @__cxx_global_var_init() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK32: call void @_ZN5test15Test1C1Ei(ptr noundef{{[^,]*}} @_ZN5test12t0E, i32 noundef 2)
// CHECK64: call void @_ZN5test15Test1C1Ei(ptr noundef{{[^,]*}} @_ZN5test12t0E, i32 noundef signext 2)
// CHECK: %0 = call i32 @atexit(ptr @__dtor__ZN5test12t0E)
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__dtor__ZN5test12t0E() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: call void @_ZN5test15Test1D1Ev(ptr @_ZN5test12t0E)
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__finalize__ZN5test12t0E() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = call i32 @unatexit(ptr @__dtor__ZN5test12t0E)
// CHECK: %needs_destruct = icmp eq i32 %0, 0
// CHECK: br i1 %needs_destruct, label %destruct.call, label %destruct.end
// CHECK: destruct.call:
// CHECK: call void @__dtor__ZN5test12t0E()
// CHECK: br label %destruct.end
// CHECK: destruct.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__cxx_global_var_init.1() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = load atomic i8, ptr @_ZGVN5test12t2E acquire, align 8
// CHECK: %guard.uninitialized = icmp eq i8 %0, 0
// CHECK: br i1 %guard.uninitialized, label %init.check, label %init.end
// CHECK: init.check:
// CHECK: %1 = call i32 @__cxa_guard_acquire(ptr @_ZGVN5test12t2E)
// CHECK: %tobool = icmp ne i32 %1, 0
// CHECK: br i1 %tobool, label %init, label %init.end
// CHECK: init:
// CHECK32: call void @_ZN5test15Test1C1Ei(ptr noundef{{[^,]*}} @_ZN5test12t2E, i32 noundef 2)
// CHECK64: call void @_ZN5test15Test1C1Ei(ptr noundef{{[^,]*}} @_ZN5test12t2E, i32 noundef signext 2)
// CHECK: %2 = call i32 @atexit(ptr @__dtor__ZN5test12t2E)
// CHECK: call void @__cxa_guard_release(ptr @_ZGVN5test12t2E)
// CHECK: br label %init.end
// CHECK: init.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__dtor__ZN5test12t2E() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: call void @_ZN5test15Test1D1Ev(ptr @_ZN5test12t2E)
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__finalize__ZN5test12t2E() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = call i32 @unatexit(ptr @__dtor__ZN5test12t2E)
// CHECK: %needs_destruct = icmp eq i32 %0, 0
// CHECK: br i1 %needs_destruct, label %destruct.call, label %destruct.end
// CHECK: destruct.call:
// CHECK: call void @__dtor__ZN5test12t2E()
// CHECK: br label %destruct.end
// CHECK: destruct.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__cxx_global_var_init.2() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = load i8, ptr @_ZGVN5test21AIvE8instanceE, align 8
// CHECK: %guard.uninitialized = icmp eq i8 %0, 0
// CHECK: br i1 %guard.uninitialized, label %init.check, label %init.end
// CHECK: init.check:
// CHECK: store i8 1, ptr @_ZGVN5test21AIvE8instanceE, align 8
// CHECK: call void @_ZN5test21AIvEC1Ev(ptr {{[^,]*}} @_ZN5test21AIvE8instanceE)
// CHECK: %1 = call i32 @atexit(ptr @__dtor__ZN5test21AIvE8instanceE)
// CHECK: br label %init.end
// CHECK: init.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__dtor__ZN5test21AIvE8instanceE() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: call void @_ZN5test21AIvED1Ev(ptr @_ZN5test21AIvE8instanceE)
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__finalize__ZN5test21AIvE8instanceE() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = call i32 @unatexit(ptr @__dtor__ZN5test21AIvE8instanceE)
// CHECK: %needs_destruct = icmp eq i32 %0, 0
// CHECK: br i1 %needs_destruct, label %destruct.call, label %destruct.end
// CHECK: destruct.call:
// CHECK: call void @__dtor__ZN5test21AIvE8instanceE()
// CHECK: br label %destruct.end
// CHECK: destruct.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__cxx_global_var_init.3() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %call = call noundef nonnull align 1 dereferenceable(1) ptr @_ZN5test23barEv()
// CHECK: %0 = call i32 @atexit(ptr @__dtor__ZN5test21AIiE8instanceE)
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__dtor__ZN5test21AIiE8instanceE() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: call void @_ZN5test21AIiED1Ev(ptr @_ZN5test21AIiE8instanceE)
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__finalize__ZN5test21AIiE8instanceE() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = call i32 @unatexit(ptr @__dtor__ZN5test21AIiE8instanceE)
// CHECK: %needs_destruct = icmp eq i32 %0, 0
// CHECK: br i1 %needs_destruct, label %destruct.call, label %destruct.end
// CHECK: destruct.call:
// CHECK: call void @__dtor__ZN5test21AIiE8instanceE()
// CHECK: br label %destruct.end
// CHECK: destruct.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__cxx_global_var_init.4() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = load i8, ptr @_ZGVN5test12t1IiEE, align 8
// CHECK: %guard.uninitialized = icmp eq i8 %0, 0
// CHECK: br i1 %guard.uninitialized, label %init.check, label %init.end
// CHECK: init.check:
// CHECK: store i8 1, ptr @_ZGVN5test12t1IiEE, align 8
// CHECK32: call void @_ZN5test15Test1C1Ei(ptr {{[^,]*}} @_ZN5test12t1IiEE, i32 noundef 2)
// CHECK64: call void @_ZN5test15Test1C1Ei(ptr {{[^,]*}} @_ZN5test12t1IiEE, i32 noundef signext 2)
// CHECK: %1 = call i32 @atexit(ptr @__dtor__ZN5test12t1IiEE)
// CHECK: br label %init.end
// CHECK: init.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__dtor__ZN5test12t1IiEE() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: call void @_ZN5test15Test1D1Ev(ptr @_ZN5test12t1IiEE)
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @__finalize__ZN5test12t1IiEE() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: %0 = call i32 @unatexit(ptr @__dtor__ZN5test12t1IiEE)
// CHECK: %needs_destruct = icmp eq i32 %0, 0
// CHECK: br i1 %needs_destruct, label %destruct.call, label %destruct.end
// CHECK: destruct.call:
// CHECK: call void @__dtor__ZN5test12t1IiEE()
// CHECK: br label %destruct.end
// CHECK: destruct.end:
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @_GLOBAL__sub_I__() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: call void @__cxx_global_var_init()
// CHECK: call void @__cxx_global_var_init.3()
// CHECK: ret void
// CHECK: }
// CHECK: define internal void @_GLOBAL__D_a() [[ATTR:#[0-9]+]] {
// CHECK: entry:
// CHECK: call void @__finalize__ZN5test21AIiE8instanceE()
// CHECK: call void @__finalize__ZN5test12t0E()
// CHECK: ret void
// CHECK: }
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