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42 lines
1.4 KiB
Odin
42 lines
1.4 KiB
Odin
package libc
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// 7.16 Variable arguments
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import "core:intrinsics"
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@(private="file")
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@(default_calling_convention="none")
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foreign _ {
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@(link_name="llvm.va_start") _va_start :: proc(arglist: ^i8) ---
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@(link_name="llvm.va_end") _va_end :: proc(arglist: ^i8) ---
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@(link_name="llvm.va_copy") _va_copy :: proc(dst, src: ^i8) ---
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}
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// Since there are no types in C with an alignment larger than that of
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// max_align_t, which cannot be larger than sizeof(long double) as any other
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// 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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va_list :: struct #align 16 {
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_: [4096]u8,
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}
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va_start :: #force_inline proc(ap: ^va_list, _: any) {
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_va_start(cast(^i8)ap)
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}
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va_end :: #force_inline proc(ap: ^va_list) {
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_va_end(cast(^i8)ap)
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}
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va_copy :: #force_inline proc(dst, src: ^va_list) {
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_va_copy(cast(^i8)dst, cast(^i8)src)
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}
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// We cannot provide va_arg as there is no way to create "C" style procedures
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// in Odin which take variable arguments the C way. The #c_vararg attribute only
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// exists for foreign imports. That being said, being able to copy a va_list,
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// as well as start and end one is necessary in some functions, the va_list
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// taking functions in libc as an example.
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