adaf62ced2
alignments In the following code, the first element is aligned on a 16-byte boundary, but the remaining elements aren't: ``` typedef char int8_a16 __attribute__((aligned(16))); int8_a16 array[4]; ``` Currently clang doesn't reject the code, but it should since it can cause crashes at runtime. This patch also fixes assertion failures in CodeGen caused by the changes in https://reviews.llvm.org/D123649. Differential Revision: https://reviews.llvm.org/D133711
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=precxx17 %std_cxx98-14 %s
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// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -Wover-aligned -verify=cxx17 %std_cxx17- %s
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namespace test1 {
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struct Test {
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template <typename T>
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struct SeparateCacheLines {
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T data;
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} __attribute__((aligned(256)));
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SeparateCacheLines<int> high_contention_data[10];
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};
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void helper() {
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Test t;
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new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
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new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
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}
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}
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namespace test2 {
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struct S {
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char c[256];
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};
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class Test {
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typedef S __attribute__((aligned(256))) alignedS;
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alignedS high_contention_data[10];
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};
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void helper() {
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Test t;
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new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
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new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
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}
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}
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namespace test3 {
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struct Test {
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template <typename T>
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struct SeparateCacheLines {
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T data;
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} __attribute__((aligned(256)));
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void* operator new(unsigned long) {
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return 0; // precxx17-warning {{'operator new' should not return a null pointer unless it is declared 'throw()'}} \
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cxx17-warning {{'operator new' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}}
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}
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SeparateCacheLines<int> high_contention_data[10];
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};
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void helper() {
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Test t;
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new Test;
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new Test[10]; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
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}
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}
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namespace test4 {
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struct Test {
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template <typename T>
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struct SeparateCacheLines {
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T data;
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} __attribute__((aligned(256)));
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void* operator new[](unsigned long) {
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return 0; // precxx17-warning {{'operator new[]' should not return a null pointer unless it is declared 'throw()'}} \
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cxx17-warning {{'operator new[]' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}}
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}
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SeparateCacheLines<int> high_contention_data[10];
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};
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void helper() {
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Test t;
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new Test; // precxx17-warning {{type 'Test' requires 256 bytes of alignment and the default allocator only guarantees}}
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new Test[10];
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}
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}
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