99d63ccff0
Non-comprehensive list of cases: * Dumping template arguments; * Corresponding parameter contains a deduced type; * Template arguments are for a DeclRefExpr that hadMultipleCandidates() Type information is added in the form of prefixes (u8, u, U, L), suffixes (U, L, UL, LL, ULL) or explicit casts to printed integral template argument, if MSVC codeview mode is disabled. Differential revision: https://reviews.llvm.org/D77598
241 lines
14 KiB
C++
241 lines
14 KiB
C++
// C++-specific checks for the alignment builtins
|
|
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -std=c++11 -o - %s -fsyntax-only -verify
|
|
|
|
// Check that we don't crash when using dependent types in __builtin_align:
|
|
template <typename a, a b>
|
|
void *c(void *d) { // expected-note{{candidate template ignored}}
|
|
return __builtin_align_down(d, b);
|
|
}
|
|
|
|
struct x {};
|
|
x foo;
|
|
void test(void *value) {
|
|
c<int, 16>(value);
|
|
c<struct x, foo>(value); // expected-error{{no matching function for call to 'c'}}
|
|
}
|
|
|
|
template <typename T, long Alignment, long ArraySize = 16>
|
|
void test_templated_arguments() {
|
|
T array[ArraySize]; // expected-error{{variable has incomplete type 'fwddecl'}}
|
|
static_assert(__is_same(decltype(__builtin_align_up(array, Alignment)), T *), // expected-error{{requested alignment is not a power of 2}}
|
|
"return type should be the decayed array type");
|
|
static_assert(__is_same(decltype(__builtin_align_down(array, Alignment)), T *),
|
|
"return type should be the decayed array type");
|
|
static_assert(__is_same(decltype(__builtin_is_aligned(array, Alignment)), bool),
|
|
"return type should be bool");
|
|
T *x1 = __builtin_align_up(array, Alignment);
|
|
T *x2 = __builtin_align_down(array, Alignment);
|
|
bool x3 = __builtin_align_up(array, Alignment);
|
|
}
|
|
|
|
void test() {
|
|
test_templated_arguments<int, 32>(); // fine
|
|
test_templated_arguments<struct fwddecl, 16>();
|
|
// expected-note@-1{{in instantiation of function template specialization 'test_templated_arguments<fwddecl, 16L, 16L>'}}
|
|
// expected-note@-2{{forward declaration of 'fwddecl'}}
|
|
test_templated_arguments<int, 7>(); // invalid alignment value
|
|
// expected-note@-1{{in instantiation of function template specialization 'test_templated_arguments<int, 7L, 16L>'}}
|
|
}
|
|
|
|
template <typename T, long ArraySize>
|
|
void test_incorrect_alignment_without_instatiation(T value) {
|
|
int array[32];
|
|
static_assert(__is_same(decltype(__builtin_align_up(array, 31)), int *), // expected-error{{requested alignment is not a power of 2}}
|
|
"return type should be the decayed array type");
|
|
static_assert(__is_same(decltype(__builtin_align_down(array, 7)), int *), // expected-error{{requested alignment is not a power of 2}}
|
|
"return type should be the decayed array type");
|
|
static_assert(__is_same(decltype(__builtin_is_aligned(array, -1)), bool), // expected-error{{requested alignment must be 1 or greater}}
|
|
"return type should be bool");
|
|
__builtin_align_up(array); // expected-error{{too few arguments to function call, expected 2, have 1}}
|
|
__builtin_align_up(array, 31); // expected-error{{requested alignment is not a power of 2}}
|
|
__builtin_align_down(array, 31); // expected-error{{requested alignment is not a power of 2}}
|
|
__builtin_align_up(array, 31); // expected-error{{requested alignment is not a power of 2}}
|
|
__builtin_align_up(value, 31); // This shouldn't want since the type is dependent
|
|
__builtin_align_up(value); // Same here
|
|
|
|
__builtin_align_up(array, sizeof(sizeof(value)) - 1); // expected-error{{requested alignment is not a power of 2}}
|
|
__builtin_align_up(array, value); // no diagnostic as the alignment is value dependent.
|
|
(void)__builtin_align_up(array, ArraySize); // The same above here
|
|
}
|
|
|
|
// The original fix for the issue above broke some legitimate code.
|
|
// Here is a regression test:
|
|
typedef __SIZE_TYPE__ size_t;
|
|
void *allocate_impl(size_t size);
|
|
template <typename T>
|
|
T *allocate() {
|
|
constexpr size_t allocation_size =
|
|
__builtin_align_up(sizeof(T), sizeof(void *));
|
|
return static_cast<T *>(
|
|
__builtin_assume_aligned(allocate_impl(allocation_size), sizeof(void *)));
|
|
}
|
|
struct Foo {
|
|
int value;
|
|
};
|
|
void *test2() {
|
|
return allocate<struct Foo>();
|
|
}
|
|
|
|
// Check that pointers-to-members cannot be used:
|
|
class MemPtr {
|
|
public:
|
|
int data;
|
|
void func();
|
|
virtual void vfunc();
|
|
};
|
|
void test_member_ptr() {
|
|
__builtin_align_up(&MemPtr::data, 64); // expected-error{{operand of type 'int MemPtr::*' where arithmetic or pointer type is required}}
|
|
__builtin_align_down(&MemPtr::func, 64); // expected-error{{operand of type 'void (MemPtr::*)()' where arithmetic or pointer type is required}}
|
|
__builtin_is_aligned(&MemPtr::vfunc, 64); // expected-error{{operand of type 'void (MemPtr::*)()' where arithmetic or pointer type is required}}
|
|
}
|
|
|
|
void test_references(Foo &i) {
|
|
// Check that the builtins look at the referenced type rather than the reference itself.
|
|
(void)__builtin_align_up(i, 64); // expected-error{{operand of type 'Foo' where arithmetic or pointer type is required}}
|
|
(void)__builtin_align_up(static_cast<Foo &>(i), 64); // expected-error{{operand of type 'Foo' where arithmetic or pointer type is required}}
|
|
(void)__builtin_align_up(static_cast<const Foo &>(i), 64); // expected-error{{operand of type 'const Foo' where arithmetic or pointer type is required}}
|
|
(void)__builtin_align_up(static_cast<Foo &&>(i), 64); // expected-error{{operand of type 'Foo' where arithmetic or pointer type is required}}
|
|
(void)__builtin_align_up(static_cast<const Foo &&>(i), 64); // expected-error{{operand of type 'const Foo' where arithmetic or pointer type is required}}
|
|
(void)__builtin_align_up(&i, 64);
|
|
}
|
|
|
|
// Check that constexpr wrapper functions can be constant-evaluated.
|
|
template <typename T>
|
|
constexpr bool wrap_is_aligned(T ptr, long align) {
|
|
return __builtin_is_aligned(ptr, align);
|
|
// expected-note@-1{{requested alignment -3 is not a positive power of two}}
|
|
// expected-note@-2{{requested alignment 19 is not a positive power of two}}
|
|
// expected-note@-3{{requested alignment must be 128 or less for type 'char'; 4194304 is invalid}}
|
|
}
|
|
template <typename T>
|
|
constexpr T wrap_align_up(T ptr, long align) {
|
|
return __builtin_align_up(ptr, align);
|
|
// expected-note@-1{{requested alignment -2 is not a positive power of two}}
|
|
// expected-note@-2{{requested alignment 18 is not a positive power of two}}
|
|
// expected-note@-3{{requested alignment must be 2147483648 or less for type 'int'; 8589934592 is invalid}}
|
|
// expected-error@-4{{operand of type 'bool' where arithmetic or pointer type is required}}
|
|
}
|
|
|
|
template <typename T>
|
|
constexpr T wrap_align_down(T ptr, long align) {
|
|
return __builtin_align_down(ptr, align);
|
|
// expected-note@-1{{requested alignment -1 is not a positive power of two}}
|
|
// expected-note@-2{{requested alignment 17 is not a positive power of two}}
|
|
// expected-note@-3{{requested alignment must be 32768 or less for type 'short'; 1048576 is invalid}}
|
|
}
|
|
|
|
constexpr int a1 = wrap_align_up(22, 32);
|
|
static_assert(a1 == 32, "");
|
|
constexpr int a2 = wrap_align_down(22, 16);
|
|
static_assert(a2 == 16, "");
|
|
constexpr bool a3 = wrap_is_aligned(22, 32);
|
|
static_assert(!a3, "");
|
|
static_assert(wrap_align_down(wrap_align_up(22, 16), 32) == 32, "");
|
|
static_assert(wrap_is_aligned(wrap_align_down(wrap_align_up(22, 16), 32), 32), "");
|
|
static_assert(!wrap_is_aligned(wrap_align_down(wrap_align_up(22, 16), 32), 64), "");
|
|
|
|
constexpr long const_value(long l) { return l; }
|
|
// Check some invalid values during constant-evaluation
|
|
static_assert(wrap_align_down(1, const_value(-1)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_align_down(1, -1)'}}
|
|
static_assert(wrap_align_up(1, const_value(-2)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_align_up(1, -2)'}}
|
|
static_assert(wrap_is_aligned(1, const_value(-3)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_is_aligned(1, -3)'}}
|
|
static_assert(wrap_align_down(1, const_value(17)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_align_down(1, 17)'}}
|
|
static_assert(wrap_align_up(1, const_value(18)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_align_up(1, 18)'}}
|
|
static_assert(wrap_is_aligned(1, const_value(19)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_is_aligned(1, 19)'}}
|
|
|
|
// Check invalid values for smaller types:
|
|
static_assert(wrap_align_down(static_cast<short>(1), const_value(1 << 20)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_align_down(1, 1048576)'}}
|
|
// Check invalid boolean type
|
|
static_assert(wrap_align_up(static_cast<int>(1), const_value(1ull << 33)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_align_up(1, 8589934592)'}}
|
|
static_assert(wrap_is_aligned(static_cast<char>(1), const_value(1 << 22)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in call to 'wrap_is_aligned(1, 4194304)'}}
|
|
|
|
// Check invalid boolean type
|
|
static_assert(wrap_align_up(static_cast<bool>(1), const_value(1 << 21)), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{in instantiation of function template specialization 'wrap_align_up<bool>' requested here}}
|
|
|
|
// Check constant evaluation for pointers:
|
|
_Alignas(32) char align32array[128];
|
|
static_assert(&align32array[0] == &align32array[0], "");
|
|
// __builtin_align_up/down can be constant evaluated as a no-op for values
|
|
// that are known to have greater alignment:
|
|
static_assert(__builtin_align_up(&align32array[0], 32) == &align32array[0], "");
|
|
static_assert(__builtin_align_up(&align32array[0], 4) == &align32array[0], "");
|
|
static_assert(__builtin_align_down(&align32array[0], 4) == __builtin_align_up(&align32array[0], 8), "");
|
|
// But it can not be evaluated if the alignment is greater than the minimum
|
|
// known alignment, since in that case the value might be the same if it happens
|
|
// to actually be aligned to 64 bytes at run time.
|
|
static_assert(&align32array[0] == __builtin_align_up(&align32array[0], 64), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{cannot constant evaluate the result of adjusting alignment to 64}}
|
|
static_assert(__builtin_align_up(&align32array[0], 64) == __builtin_align_up(&align32array[0], 64), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{cannot constant evaluate the result of adjusting alignment to 64}}
|
|
|
|
// However, we can compute in case the requested alignment is less than the
|
|
// base alignment:
|
|
static_assert(__builtin_align_up(&align32array[0], 4) == &align32array[0], "");
|
|
static_assert(__builtin_align_up(&align32array[1], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_up(&align32array[2], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_up(&align32array[3], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_up(&align32array[4], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_up(&align32array[5], 4) == &align32array[8], "");
|
|
static_assert(__builtin_align_up(&align32array[6], 4) == &align32array[8], "");
|
|
static_assert(__builtin_align_up(&align32array[7], 4) == &align32array[8], "");
|
|
static_assert(__builtin_align_up(&align32array[8], 4) == &align32array[8], "");
|
|
|
|
static_assert(__builtin_align_down(&align32array[0], 4) == &align32array[0], "");
|
|
static_assert(__builtin_align_down(&align32array[1], 4) == &align32array[0], "");
|
|
static_assert(__builtin_align_down(&align32array[2], 4) == &align32array[0], "");
|
|
static_assert(__builtin_align_down(&align32array[3], 4) == &align32array[0], "");
|
|
static_assert(__builtin_align_down(&align32array[4], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_down(&align32array[5], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_down(&align32array[6], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_down(&align32array[7], 4) == &align32array[4], "");
|
|
static_assert(__builtin_align_down(&align32array[8], 4) == &align32array[8], "");
|
|
|
|
// Achiving the same thing using casts to uintptr_t is not allowed:
|
|
static_assert((char *)((__UINTPTR_TYPE__)&align32array[7] & ~3) == &align32array[4], ""); // expected-error{{not an integral constant expression}}
|
|
|
|
static_assert(__builtin_align_down(&align32array[1], 4) == &align32array[0], "");
|
|
static_assert(__builtin_align_down(&align32array[1], 64) == &align32array[0], ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{cannot constant evaluate the result of adjusting alignment to 64}}
|
|
|
|
// Add some checks for __builtin_is_aligned:
|
|
static_assert(__builtin_is_aligned(&align32array[0], 32), "");
|
|
static_assert(__builtin_is_aligned(&align32array[4], 4), "");
|
|
// We cannot constant evaluate whether the array is aligned to > 32 since this
|
|
// may well be true at run time.
|
|
static_assert(!__builtin_is_aligned(&align32array[0], 64), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{cannot constant evaluate whether run-time alignment is at least 64}}
|
|
|
|
// However, if the alignment being checked is less than the minimum alignment of
|
|
// the base object we can check the low bits of the alignment:
|
|
static_assert(__builtin_is_aligned(&align32array[0], 4), "");
|
|
static_assert(!__builtin_is_aligned(&align32array[1], 4), "");
|
|
static_assert(!__builtin_is_aligned(&align32array[2], 4), "");
|
|
static_assert(!__builtin_is_aligned(&align32array[3], 4), "");
|
|
static_assert(__builtin_is_aligned(&align32array[4], 4), "");
|
|
|
|
// TODO: this should evaluate to true even though we can't evaluate the result
|
|
// of __builtin_align_up() to a concrete value
|
|
static_assert(__builtin_is_aligned(__builtin_align_up(&align32array[0], 64), 64), ""); // expected-error{{not an integral constant expression}}
|
|
// expected-note@-1{{cannot constant evaluate the result of adjusting alignment to 64}}
|
|
|
|
// Check different source and alignment type widths are handled correctly.
|
|
static_assert(!__builtin_is_aligned(static_cast<signed long>(7), static_cast<signed short>(4)), "");
|
|
static_assert(!__builtin_is_aligned(static_cast<signed short>(7), static_cast<signed long>(4)), "");
|
|
// Also check signed -- unsigned mismatch.
|
|
static_assert(!__builtin_is_aligned(static_cast<signed long>(7), static_cast<signed long>(4)), "");
|
|
static_assert(!__builtin_is_aligned(static_cast<unsigned long>(7), static_cast<unsigned long>(4)), "");
|
|
static_assert(!__builtin_is_aligned(static_cast<signed long>(7), static_cast<unsigned long>(4)), "");
|
|
static_assert(!__builtin_is_aligned(static_cast<unsigned long>(7), static_cast<signed long>(4)), "");
|
|
static_assert(!__builtin_is_aligned(static_cast<signed long>(7), static_cast<unsigned short>(4)), "");
|
|
static_assert(!__builtin_is_aligned(static_cast<unsigned short>(7), static_cast<signed long>(4)), "");
|