349 lines
14 KiB
C++
349 lines
14 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_ONE -std=c++03 %s
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// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_ONE -std=c++11 %s
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// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_ONE -std=c++14 %s
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// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_TWO \
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// RUN: -Wglobal-constructors -std=c++14 %s
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// RUN: %clang_cc1 -fsyntax-only -verify -DTEST_THREE -xc %s
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#define ATTR __attribute__((require_constant_initialization)) // expected-note 0+ {{expanded from macro}}
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int ReturnInt(); // expected-note 0+ {{declared here}}
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struct PODType { // expected-note 0+ {{declared here}}
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int value; // expected-note 0-2 {{declared here}}
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int value2;
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};
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#if defined(__cplusplus)
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#if __cplusplus >= 201103L
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struct LitType {
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constexpr LitType() : value(0) {}
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constexpr LitType(int x) : value(x) {}
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LitType(void *) : value(-1) {} // expected-note 0+ {{declared here}}
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int value;
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};
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#endif
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struct NonLit { // expected-note 0+ {{declared here}}
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#if __cplusplus >= 201402L
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constexpr NonLit() : value(0) {}
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constexpr NonLit(int x) : value(x) {}
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#else
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NonLit() : value(0) {} // expected-note 0+ {{declared here}}
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NonLit(int x) : value(x) {}
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#endif
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NonLit(void *) : value(-1) {} // expected-note 0+ {{declared here}}
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~NonLit() {}
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int value;
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};
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struct StoresNonLit {
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#if __cplusplus >= 201402L
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constexpr StoresNonLit() : obj() {}
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constexpr StoresNonLit(int x) : obj(x) {}
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#else
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StoresNonLit() : obj() {} // expected-note 0+ {{declared here}}
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StoresNonLit(int x) : obj(x) {}
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#endif
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StoresNonLit(void *p) : obj(p) {}
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NonLit obj;
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};
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#endif // __cplusplus
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#if defined(TEST_ONE) // Test semantics of attribute
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// Test diagnostics when attribute is applied to non-static declarations.
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void test_func_local(ATTR int param) { // expected-error {{only applies to global variables}}
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ATTR int x = 42; // expected-error {{only applies to}}
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ATTR extern int y;
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}
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struct ATTR class_mem { // expected-error {{only applies to}}
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ATTR int x; // expected-error {{only applies to}}
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};
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// [basic.start.static]p2.1
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// if each full-expression (including implicit conversions) that appears in
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// the initializer of a reference with static or thread storage duration is
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// a constant expression (5.20) and the reference is bound to a glvalue
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// designating an object with static storage duration, to a temporary object
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// (see 12.2) or subobject thereof, or to a function;
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// Test binding to a static glvalue
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const int glvalue_int = 42;
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const int glvalue_int2 = ReturnInt();
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ATTR const int &glvalue_ref ATTR = glvalue_int;
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ATTR const int &glvalue_ref2 ATTR = glvalue_int2;
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ATTR __thread const int &glvalue_ref_tl = glvalue_int;
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void test_basic_start_static_2_1() {
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const int non_global = 42;
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ATTR static const int &local_init = non_global; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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#if __cplusplus >= 201103L
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// expected-note@-3 {{reference to 'non_global' is not a constant expression}}
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// expected-note@-5 {{declared here}}
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#else
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// expected-note@-6 {{subexpression not valid in a constant expression}}
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#endif
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ATTR static const int &global_init = glvalue_int;
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ATTR static const int &temp_init = 42;
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}
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ATTR const int &temp_ref = 42;
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ATTR const int &temp_ref2 = ReturnInt(); // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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#if __cplusplus >= 201103L
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// expected-note@-3 {{non-constexpr function 'ReturnInt' cannot be used in a constant expression}}
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#else
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// expected-note@-5 {{subexpression not valid in a constant expression}}
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#endif
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ATTR const NonLit &nl_temp_ref = 42; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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#if __cplusplus >= 201103L
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// expected-note@-3 {{non-literal type 'const NonLit' cannot be used in a constant expression}}
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#else
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// expected-note@-5 {{subexpression not valid in a constant expression}}
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#endif
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#if __cplusplus >= 201103L
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ATTR const LitType &lit_temp_ref = 42;
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ATTR const int &subobj_ref = LitType{}.value;
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#endif
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ATTR const int &nl_subobj_ref = NonLit().value; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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#if __cplusplus >= 201103L
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// expected-note-re@-3 {{non-literal type '{{.*}}' cannot be used in a constant expression}}
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#else
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// expected-note@-5 {{subexpression not valid in a constant expression}}
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#endif
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struct TT1 {
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ATTR static const int &no_init;
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ATTR static const int &glvalue_init;
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ATTR static const int &temp_init;
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ATTR static const int &subobj_init;
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#if __cplusplus >= 201103L
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ATTR static thread_local const int &tl_glvalue_init;
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ATTR static thread_local const int &tl_temp_init; // expected-note {{required by 'require_constant_initialization' attribute here}}
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#endif
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};
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const int &TT1::glvalue_init = glvalue_int;
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const int &TT1::temp_init = 42;
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const int &TT1::subobj_init = PODType().value;
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#if __cplusplus >= 201103L
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thread_local const int &TT1::tl_glvalue_init = glvalue_int;
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thread_local const int &TT1::tl_temp_init = 42; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{reference to temporary is not a constant expression}}
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// expected-note@-2 {{temporary created here}}
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#endif
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// [basic.start.static]p2.2
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// if an object with static or thread storage duration is initialized by a
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// constructor call, and if the initialization full-expression is a constant
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// initializer for the object;
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void test_basic_start_static_2_2() {
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#if __cplusplus < 201103L
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ATTR static PODType pod;
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#else
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ATTR static PODType pod; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note-re@-2 {{{{non-constexpr constructor|subobject of type 'int' is not initialized}}}}
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#endif
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ATTR static PODType pot2 = {ReturnInt()}; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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#if __cplusplus >= 201103L
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// expected-note@-3 {{non-constexpr function 'ReturnInt' cannot be used in a constant expression}}
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#else
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// expected-note@-5 {{subexpression not valid in a constant expression}}
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#endif
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#if __cplusplus >= 201103L
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constexpr LitType l;
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ATTR static LitType static_lit = l;
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ATTR static LitType static_lit2 = (void *)0; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr constructor 'LitType' cannot be used in a constant expression}}
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ATTR static LitType static_lit3 = ReturnInt(); // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr function 'ReturnInt' cannot be used in a constant expression}}
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ATTR thread_local LitType tls = 42;
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#endif
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}
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struct TT2 {
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ATTR static PODType pod_noinit;
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#if __cplusplus >= 201103L
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// expected-note@-2 {{required by 'require_constant_initialization' attribute here}}
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#endif
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ATTR static PODType pod_copy_init; // expected-note {{required by 'require_constant_initialization' attribute here}}
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#if __cplusplus >= 201402L
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ATTR static constexpr LitType lit = {};
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ATTR static const NonLit non_lit;
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ATTR static const NonLit non_lit_list_init;
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ATTR static const NonLit non_lit_copy_init;
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#endif
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};
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PODType TT2::pod_noinit; // expected-note 0+ {{declared here}}
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#if __cplusplus >= 201103L
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// expected-error@-2 {{variable does not have a constant initializer}}
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// expected-note-re@-3 {{{{non-constexpr constructor|subobject of type 'int' is not initialized}}}}
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#endif
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PODType TT2::pod_copy_init(TT2::pod_noinit); // expected-error {{variable does not have a constant initializer}}
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#if __cplusplus >= 201103L
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// expected-note@-2 {{read of non-constexpr variable 'pod_noinit' is not allowed in a constant expression}}
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// expected-note@-3 {{in call to 'PODType(pod_noinit)'}}
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#else
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// expected-note@-5 {{subexpression not valid in a constant expression}}
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#endif
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#if __cplusplus >= 201402L
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const NonLit TT2::non_lit(42);
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const NonLit TT2::non_lit_list_init = {42};
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// FIXME: This is invalid, but we incorrectly elide the copy. It's OK if we
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// start diagnosing this.
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const NonLit TT2::non_lit_copy_init = 42;
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#endif
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#if __cplusplus >= 201103L
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ATTR LitType lit_ctor;
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ATTR LitType lit_ctor2{};
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ATTR LitType lit_ctor3 = {};
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ATTR __thread LitType lit_ctor_tl = {};
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#if __cplusplus >= 201402L
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ATTR NonLit nl_ctor;
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ATTR NonLit nl_ctor2{};
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ATTR NonLit nl_ctor3 = {};
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ATTR thread_local NonLit nl_ctor_tl = {};
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ATTR StoresNonLit snl;
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#else
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ATTR NonLit nl_ctor; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr constructor 'NonLit' cannot be used in a constant expression}}
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ATTR NonLit nl_ctor2{}; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr constructor 'NonLit' cannot be used in a constant expression}}
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ATTR NonLit nl_ctor3 = {}; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr constructor 'NonLit' cannot be used in a constant expression}}
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ATTR thread_local NonLit nl_ctor_tl = {}; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr constructor 'NonLit' cannot be used in a constant expression}}
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ATTR StoresNonLit snl; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr constructor 'StoresNonLit' cannot be used in a constant expression}}
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#endif
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// Non-literal types cannot appear in the initializer of a non-literal type.
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ATTR int nl_in_init = NonLit{42}.value; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-literal type 'NonLit' cannot be used in a constant expression}}
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ATTR int lit_in_init = LitType{42}.value;
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#endif
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// [basic.start.static]p2.3
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// if an object with static or thread storage duration is not initialized by a
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// constructor call and if either the object is value-initialized or every
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// full-expression that appears in its initializer is a constant expression.
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void test_basic_start_static_2_3() {
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ATTR static int static_local = 42;
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ATTR static int static_local2; // zero-initialization takes place
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#if __cplusplus >= 201103L
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ATTR thread_local int tl_local = 42;
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#endif
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}
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ATTR int no_init; // zero initialization takes place
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ATTR int arg_init = 42;
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ATTR PODType pod_init = {};
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ATTR PODType pod_missing_init = {42 /* should have second arg */};
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ATTR PODType pod_full_init = {1, 2};
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ATTR PODType pod_non_constexpr_init = {1, ReturnInt()}; // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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#if __cplusplus >= 201103L
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// expected-note@-3 {{non-constexpr function 'ReturnInt' cannot be used in a constant expression}}
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#else
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// expected-note@-5 {{subexpression not valid in a constant expression}}
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#endif
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#if __cplusplus >= 201103L
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ATTR int val_init{};
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ATTR int brace_init = {};
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#endif
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ATTR __thread int tl_init = 0;
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typedef const char *StrType;
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#if __cplusplus >= 201103L
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// Test that the validity of the selected constructor is checked, not just the
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// initializer
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struct NotC {
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constexpr NotC(void *) {}
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NotC(int) {} // expected-note 0+ {{declared here}}
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};
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template <class T>
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struct TestCtor {
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constexpr TestCtor(int x) : value(x) {}
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// expected-note@-1 {{non-constexpr constructor 'NotC' cannot be used in a constant expression}}
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T value;
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};
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ATTR TestCtor<NotC> t(42); // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{in call to 'TestCtor(42)'}}
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#endif
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// Test various array types
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ATTR const char *foo[] = {"abc", "def"};
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ATTR PODType bar[] = {{}, {123, 456}};
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namespace AttrAddedTooLate {
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struct A {
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static const int n = 0; // expected-note {{here}}
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};
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ATTR const int A::n; // expected-warning {{added after initialization}}
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int m = 0; // expected-note {{here}}
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extern ATTR int m; // expected-warning {{added after initialization}}
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}
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#elif defined(TEST_TWO) // Test for duplicate warnings
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struct NotC {
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constexpr NotC(void *) {}
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NotC(int) {} // expected-note 2 {{declared here}}
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};
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template <class T>
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struct TestCtor {
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constexpr TestCtor(int x) : value(x) {} // expected-note 2 {{non-constexpr constructor}}
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T value;
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};
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ATTR LitType non_const_lit(nullptr); // expected-error {{variable does not have a constant initializer}}
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// expected-note@-1 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-2 {{non-constexpr constructor 'LitType' cannot be used in a constant expression}}
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ATTR NonLit non_const(nullptr); // expected-error {{variable does not have a constant initializer}}
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// expected-warning@-1 {{declaration requires a global destructor}}
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// expected-note@-2 {{required by 'require_constant_initialization' attribute here}}
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// expected-note@-3 {{non-constexpr constructor 'NonLit' cannot be used in a constant expression}}
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LitType const_init_lit(nullptr); // expected-warning {{declaration requires a global constructor}}
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NonLit const_init{42}; // expected-warning {{declaration requires a global destructor}}
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constexpr TestCtor<NotC> inval_constexpr(42); // expected-error {{must be initialized by a constant expression}}
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// expected-note@-1 {{in call to 'TestCtor(42)'}}
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ATTR constexpr TestCtor<NotC> inval_constexpr2(42); // expected-error {{must be initialized by a constant expression}}
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// expected-note@-1 {{in call to 'TestCtor(42)'}}
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#elif defined(TEST_THREE)
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#if defined(__cplusplus)
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#error This test requires C
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#endif
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// Test that using the attribute in C results in a diagnostic
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ATTR int x = 0; // expected-warning {{attribute ignored}}
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#else
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#error No test case specified
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#endif // defined(TEST_N)
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