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Summary: As @rsmith notes in https://reviews.llvm.org/D73020#inline-672219 while that is certainly UB land, it may not be actually reachable at runtime, e.g.: ``` template<int N> void *make() { if ((N & (N-1)) == 0) return operator new(N, std::align_val_t(N)); else return operator new(N); } void *p = make<7>(); ``` and we shouldn't really error-out there. That being said, i'm not really following the logic here. Which ones of these cases should remain being an error? Reviewers: rsmith, erichkeane Reviewed By: erichkeane Subscribers: cfe-commits, rsmith Tags: #clang Differential Revision: https://reviews.llvm.org/D73996
32 lines
1.9 KiB
C
32 lines
1.9 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify %s
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// return values
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void test_void_alloc_align(void) __attribute__((alloc_align(1))); // expected-warning {{'alloc_align' attribute only applies to return values that are pointers}}
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void *test_ptr_alloc_align(int a) __attribute__((alloc_align(1))); // no-warning
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int j __attribute__((alloc_align(1))); // expected-warning {{'alloc_align' attribute only applies to non-K&R-style functions}}
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void *test_no_params_zero(void) __attribute__((alloc_align(0))); // expected-error {{'alloc_align' attribute parameter 1 is out of bounds}}
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void *test_no_params(void) __attribute__((alloc_align(1))); // expected-error {{'alloc_align' attribute parameter 1 is out of bounds}}
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void *test_incorrect_param_type(float a) __attribute__((alloc_align(1))); // expected-error {{'alloc_align' attribute argument may only refer to a function parameter of integer type}}
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// argument type
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void *test_bad_param_type(void) __attribute((alloc_align(1.1))); // expected-error {{'alloc_align' attribute requires parameter 1 to be an integer constant}}
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// argument count
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void *test_no_fn_proto(int x, int y) __attribute__((alloc_align)); // expected-error {{'alloc_align' attribute takes one argument}}
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void *test_no_fn_proto(int x, int y) __attribute__((alloc_align())); // expected-error {{'alloc_align' attribute takes one argument}}
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void *test_no_fn_proto(int x, int y) __attribute__((alloc_align(32, 45, 37))); // expected-error {{'alloc_align' attribute takes one argument}}
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void *passthrought(int a) {
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return test_ptr_alloc_align(a);
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}
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void *align16() {
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return test_ptr_alloc_align(16);
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}
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void *align15() {
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return test_ptr_alloc_align(15); // expected-warning {{requested alignment is not a power of 2}}
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}
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void *align536870912() {
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return test_ptr_alloc_align(1073741824); // expected-warning {{requested alignment must be 536870912 bytes or smaller; maximum alignment assumed}}
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}
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