mirror of
https://github.com/Ed94/Odin.git
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Dale Weiler
32 lines
1.3 KiB
Odin
32 lines
1.3 KiB
Odin
package libc
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// 7.13 Nonlocal jumps
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foreign import libc "system:c"
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@(default_calling_convention="c")
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foreign libc {
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// 7.13.1 Save calling environment
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//
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// NOTE(dweiler): C11 requires setjmp be a macro, which means it won't
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// necessarily export a symbol named setjmp but rather _setjmp in the case
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// of musl, glibc, BSD libc, and msvcrt.
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@(link_name="_setjmp")
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setjmp :: proc(env: ^jmp_buf) -> int ---;
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// 7.13.2 Restore calling environment
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longjmp :: proc(env: ^jmp_buf, val: int) -> ! ---;
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}
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// The C99 Rationale describes jmp_buf as being an array type for backward
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// compatibility. Odin does not need to honor this and couldn't as arrays in
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// Odin don't decay to pointers. It is somewhat easy for us to bind this, we
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// just need to ensure the structure contains enough storage with appropriate
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// alignment. Since there are no types in C with an alignment larger than
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// that of max_align_t, which cannot be larger than sizeof(long double) as any
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// other exposed type wouldn't be valid C, the maximum alignment possible in a
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// strictly conformant C implementation is 16 on the platforms we care about.
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// The choice of 4096 bytes for storage of this type is more than enough on all
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// relevant platforms.
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jmp_buf :: struct #align 16 { _: [4096]char, };
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