133 lines
3.0 KiB
Rust
133 lines
3.0 KiB
Rust
#[doc = "Misc low level stuff"];
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export type_desc;
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export get_type_desc;
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export size_of;
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export min_align_of;
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export pref_align_of;
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export refcount;
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export log_str;
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enum type_desc = {
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first_param: **libc::c_int,
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size: libc::size_t,
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align: libc::size_t
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// Remaining fields not listed
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};
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#[abi = "cdecl"]
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native mod rustrt {
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pure fn refcount(t: *()) -> libc::intptr_t;
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fn unsupervise();
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pure fn shape_log_str(t: *sys::type_desc, data: *()) -> str;
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}
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#[abi = "rust-intrinsic"]
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native mod rusti {
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fn get_tydesc<T>() -> *();
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fn size_of<T>() -> uint;
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fn pref_align_of<T>() -> uint;
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fn min_align_of<T>() -> uint;
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}
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#[doc = "
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Returns a pointer to a type descriptor.
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Useful for calling certain function in the Rust runtime or otherwise
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performing dark magick.
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"]
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pure fn get_type_desc<T>() -> *type_desc {
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unchecked { rusti::get_tydesc::<T>() as *type_desc }
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}
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#[doc = "Returns the size of a type"]
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pure fn size_of<T>() -> uint unsafe {
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unchecked { rusti::size_of::<T>() }
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}
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#[doc = "
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Returns the ABI-required minimum alignment of a type
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This is the alignment used for struct fields. It may be smaller
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than the preferred alignment.
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"]
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pure fn min_align_of<T>() -> uint unsafe {
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unchecked { rusti::min_align_of::<T>() }
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}
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#[doc = "Returns the preferred alignment of a type"]
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pure fn pref_align_of<T>() -> uint unsafe {
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unchecked { rusti::pref_align_of::<T>() }
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}
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#[doc = "Returns the refcount of a shared box"]
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pure fn refcount<T>(t: @T) -> uint {
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unsafe {
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ret rustrt::refcount(unsafe::reinterpret_cast(t)) as uint;
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}
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}
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pure fn log_str<T>(t: T) -> str {
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unsafe {
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let data_ptr: *() = unsafe::reinterpret_cast(ptr::addr_of(t));
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rustrt::shape_log_str(get_type_desc::<T>(), data_ptr)
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}
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}
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#[cfg(test)]
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mod tests {
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#[test]
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fn size_of_basic() {
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assert size_of::<u8>() == 1u;
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assert size_of::<u16>() == 2u;
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assert size_of::<u32>() == 4u;
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assert size_of::<u64>() == 8u;
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}
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#[test]
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#[cfg(target_arch = "x86")]
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#[cfg(target_arch = "arm")]
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fn size_of_32() {
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assert size_of::<uint>() == 4u;
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assert size_of::<*uint>() == 4u;
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}
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#[test]
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#[cfg(target_arch = "x86_64")]
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fn size_of_64() {
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assert size_of::<uint>() == 8u;
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assert size_of::<*uint>() == 8u;
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}
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#[test]
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fn align_of_basic() {
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assert pref_align_of::<u8>() == 1u;
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assert pref_align_of::<u16>() == 2u;
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assert pref_align_of::<u32>() == 4u;
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}
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#[test]
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#[cfg(target_arch = "x86")]
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#[cfg(target_arch = "arm")]
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fn align_of_32() {
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assert pref_align_of::<uint>() == 4u;
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assert pref_align_of::<*uint>() == 4u;
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}
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#[test]
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#[cfg(target_arch = "x86_64")]
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fn align_of_64() {
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assert pref_align_of::<uint>() == 8u;
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assert pref_align_of::<*uint>() == 8u;
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}
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}
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// Local Variables:
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// mode: rust;
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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