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Summary: `alloc_align` attribute takes parameter number, not the alignment itself, so given **just** the attribute/function declaration we can't do any sanity checking for said alignment. However, at call site, given the actual `Expr` that is passed into that parameter, we //might// be able to evaluate said `Expr` as Integer Constant Expression, and perform the sanity checks. But since there is no requirement for that argument to be an immediate, we may fail, and that's okay. However if we did evaluate, we should enforce the same constraints as with `__builtin_assume_aligned()`/`__attribute__((assume_aligned(imm)))`: said alignment is a power of two, and is not greater than our magic threshold This was initially committed inc2a9061ac5but reverted in00756b1823because of suspicious bot failures. Reviewers: erichkeane, aaron.ballman, hfinkel, rsmith, jdoerfert Reviewed By: erichkeane Subscribers: cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D72996
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-error {{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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