[clang] Segmentation fault with static_assert(__builtin_is_implicit_lifetime(int __attribute__((btf_type_tag("user"))) *))
#106864
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clang:frontend
Language frontend issues, e.g. anything involving "Sema"
crash
Prefer [crash-on-valid] or [crash-on-invalid]
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EugeneZelenko
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@llvm/issue-subscribers-clang-frontend Author: Hristo Hristov (Zingam)
The following libc++ lit test causes a segmentation fault:
#include <cassert>
template <typename T>
constexpr void test1() {
assert(true);
static_assert(__builtin_is_implicit_lifetime(int __attribute__((btf_type_tag("user"))) *));
}
constexpr bool test() {
test1<int>();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
} |
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There's an assertion failure with templates containing a template <typename T>
void test1() {
static_assert(!__is_void(int __attribute__((btf_type_tag("user"))) *));
}
void test() {
test1<int>();
}llvm-project/clang/lib/Sema/TreeTransform.h Lines 7455 to 7460 in cd3667d This crash also happens for Also a bit concerning that there's a |
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I think the assertions don't make sense. afaict there is nothing that would prevent a c++ program to create those. |
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Looks like a clang-15 regression: https://godbolt.org/z/9zM3668zW |
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Well that's certainly a surprise! So this should only be available in C, not C++. However, it seems that the code to actually prohibit this in C is not being called in |
AaronBallman
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Sep 4, 2024
This was always intended to be disallowed in C++ (see the definition in Attr.td), but failed to add the correct checking code in SemaType.cpp to ensure it was rejected. Fixes llvm#106864
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The following libc++ lit test causes a segmentation fault:
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