1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 /*! rustc compiler intrinsics.
13 The corresponding definitions are in librustc/middle/trans/foreign.rs.
17 The volatile intrinsics provide operations intended to act on I/O
18 memory, which are guaranteed to not be reordered by the compiler
19 across other volatile intrinsics. See the LLVM documentation on
22 [volatile]: http://llvm.org/docs/LangRef.html#volatile-memory-accesses
26 The atomic intrinsics provide common atomic operations on machine
27 words, with multiple possible memory orderings. They obey the same
28 semantics as C++11. See the LLVM documentation on [[atomics]].
30 [atomics]: http://llvm.org/docs/Atomics.html
32 A quick refresher on memory ordering:
34 * Acquire - a barrier for acquiring a lock. Subsequent reads and writes
35 take place after the barrier.
36 * Release - a barrier for releasing a lock. Preceding reads and writes
37 take place before the barrier.
38 * Sequentially consistent - sequentially consistent operations are
39 guaranteed to happen in order. This is the standard mode for working
40 with atomic types and is equivalent to Java's `volatile`.
45 #![allow(missing_doc)]
47 // This is needed to prevent duplicate lang item definitions.
49 pub use realcore::intrinsics::{TyDesc, Opaque, TyVisitor, TypeId};
51 pub type GlueFn = extern "Rust" fn(*i8);
62 // Called when a value of type `T` is no longer needed
63 pub drop_glue: GlueFn,
65 // Called by reflection visitor to visit a value of type `T`
66 pub visit_glue: GlueFn,
68 // Name corresponding to the type
69 pub name: &'static str,
81 fn visit_bot(&mut self) -> bool;
82 fn visit_nil(&mut self) -> bool;
83 fn visit_bool(&mut self) -> bool;
85 fn visit_int(&mut self) -> bool;
86 fn visit_i8(&mut self) -> bool;
87 fn visit_i16(&mut self) -> bool;
88 fn visit_i32(&mut self) -> bool;
89 fn visit_i64(&mut self) -> bool;
91 fn visit_uint(&mut self) -> bool;
92 fn visit_u8(&mut self) -> bool;
93 fn visit_u16(&mut self) -> bool;
94 fn visit_u32(&mut self) -> bool;
95 fn visit_u64(&mut self) -> bool;
97 fn visit_f32(&mut self) -> bool;
98 fn visit_f64(&mut self) -> bool;
99 fn visit_f128(&mut self) -> bool;
101 fn visit_char(&mut self) -> bool;
104 fn visit_estr_box(&mut self) -> bool;
106 fn visit_estr_uniq(&mut self) -> bool;
107 fn visit_estr_slice(&mut self) -> bool;
108 fn visit_estr_fixed(&mut self, n: uint, sz: uint, align: uint) -> bool;
110 fn visit_box(&mut self, mtbl: uint, inner: *TyDesc) -> bool;
111 fn visit_uniq(&mut self, mtbl: uint, inner: *TyDesc) -> bool;
112 fn visit_ptr(&mut self, mtbl: uint, inner: *TyDesc) -> bool;
113 fn visit_rptr(&mut self, mtbl: uint, inner: *TyDesc) -> bool;
116 fn visit_evec_box(&mut self, mtbl: uint, inner: *TyDesc) -> bool;
118 fn visit_evec_uniq(&mut self, mtbl: uint, inner: *TyDesc) -> bool;
119 fn visit_evec_slice(&mut self, mtbl: uint, inner: *TyDesc) -> bool;
120 fn visit_evec_fixed(&mut self, n: uint, sz: uint, align: uint,
121 mtbl: uint, inner: *TyDesc) -> bool;
123 fn visit_enter_rec(&mut self, n_fields: uint,
124 sz: uint, align: uint) -> bool;
125 fn visit_rec_field(&mut self, i: uint, name: &str,
126 mtbl: uint, inner: *TyDesc) -> bool;
127 fn visit_leave_rec(&mut self, n_fields: uint,
128 sz: uint, align: uint) -> bool;
130 fn visit_enter_class(&mut self, name: &str, named_fields: bool, n_fields: uint,
131 sz: uint, align: uint) -> bool;
132 fn visit_class_field(&mut self, i: uint, name: &str, named: bool,
133 mtbl: uint, inner: *TyDesc) -> bool;
134 fn visit_leave_class(&mut self, name: &str, named_fields: bool, n_fields: uint,
135 sz: uint, align: uint) -> bool;
137 fn visit_enter_tup(&mut self, n_fields: uint,
138 sz: uint, align: uint) -> bool;
139 fn visit_tup_field(&mut self, i: uint, inner: *TyDesc) -> bool;
140 fn visit_leave_tup(&mut self, n_fields: uint,
141 sz: uint, align: uint) -> bool;
143 fn visit_enter_enum(&mut self, n_variants: uint,
144 get_disr: unsafe extern fn(ptr: *Opaque) -> Disr,
145 sz: uint, align: uint) -> bool;
146 fn visit_enter_enum_variant(&mut self, variant: uint,
150 fn visit_enum_variant_field(&mut self, i: uint, offset: uint, inner: *TyDesc) -> bool;
151 fn visit_leave_enum_variant(&mut self, variant: uint,
155 fn visit_leave_enum(&mut self, n_variants: uint,
156 get_disr: unsafe extern fn(ptr: *Opaque) -> Disr,
157 sz: uint, align: uint) -> bool;
159 fn visit_enter_fn(&mut self, purity: uint, proto: uint,
160 n_inputs: uint, retstyle: uint) -> bool;
161 fn visit_fn_input(&mut self, i: uint, mode: uint, inner: *TyDesc) -> bool;
162 fn visit_fn_output(&mut self, retstyle: uint, variadic: bool, inner: *TyDesc) -> bool;
163 fn visit_leave_fn(&mut self, purity: uint, proto: uint,
164 n_inputs: uint, retstyle: uint) -> bool;
166 fn visit_trait(&mut self, name: &str) -> bool;
167 fn visit_param(&mut self, i: uint) -> bool;
168 fn visit_self(&mut self) -> bool;
171 extern "rust-intrinsic" {
173 // NB: These intrinsics take unsafe pointers because they mutate aliased
174 // memory, which is not valid for either `&` or `&mut`.
176 pub fn atomic_cxchg<T>(dst: *mut T, old: T, src: T) -> T;
177 pub fn atomic_cxchg_acq<T>(dst: *mut T, old: T, src: T) -> T;
178 pub fn atomic_cxchg_rel<T>(dst: *mut T, old: T, src: T) -> T;
179 pub fn atomic_cxchg_acqrel<T>(dst: *mut T, old: T, src: T) -> T;
180 pub fn atomic_cxchg_relaxed<T>(dst: *mut T, old: T, src: T) -> T;
182 pub fn atomic_load<T>(src: *T) -> T;
183 pub fn atomic_load_acq<T>(src: *T) -> T;
184 pub fn atomic_load_relaxed<T>(src: *T) -> T;
186 pub fn atomic_store<T>(dst: *mut T, val: T);
187 pub fn atomic_store_rel<T>(dst: *mut T, val: T);
188 pub fn atomic_store_relaxed<T>(dst: *mut T, val: T);
190 pub fn atomic_xchg<T>(dst: *mut T, src: T) -> T;
191 pub fn atomic_xchg_acq<T>(dst: *mut T, src: T) -> T;
192 pub fn atomic_xchg_rel<T>(dst: *mut T, src: T) -> T;
193 pub fn atomic_xchg_acqrel<T>(dst: *mut T, src: T) -> T;
194 pub fn atomic_xchg_relaxed<T>(dst: *mut T, src: T) -> T;
196 pub fn atomic_xadd<T>(dst: *mut T, src: T) -> T;
197 pub fn atomic_xadd_acq<T>(dst: *mut T, src: T) -> T;
198 pub fn atomic_xadd_rel<T>(dst: *mut T, src: T) -> T;
199 pub fn atomic_xadd_acqrel<T>(dst: *mut T, src: T) -> T;
200 pub fn atomic_xadd_relaxed<T>(dst: *mut T, src: T) -> T;
202 pub fn atomic_xsub<T>(dst: *mut T, src: T) -> T;
203 pub fn atomic_xsub_acq<T>(dst: *mut T, src: T) -> T;
204 pub fn atomic_xsub_rel<T>(dst: *mut T, src: T) -> T;
205 pub fn atomic_xsub_acqrel<T>(dst: *mut T, src: T) -> T;
206 pub fn atomic_xsub_relaxed<T>(dst: *mut T, src: T) -> T;
208 pub fn atomic_and<T>(dst: *mut T, src: T) -> T;
209 pub fn atomic_and_acq<T>(dst: *mut T, src: T) -> T;
210 pub fn atomic_and_rel<T>(dst: *mut T, src: T) -> T;
211 pub fn atomic_and_acqrel<T>(dst: *mut T, src: T) -> T;
212 pub fn atomic_and_relaxed<T>(dst: *mut T, src: T) -> T;
214 pub fn atomic_nand<T>(dst: *mut T, src: T) -> T;
215 pub fn atomic_nand_acq<T>(dst: *mut T, src: T) -> T;
216 pub fn atomic_nand_rel<T>(dst: *mut T, src: T) -> T;
217 pub fn atomic_nand_acqrel<T>(dst: *mut T, src: T) -> T;
218 pub fn atomic_nand_relaxed<T>(dst: *mut T, src: T) -> T;
220 pub fn atomic_or<T>(dst: *mut T, src: T) -> T;
221 pub fn atomic_or_acq<T>(dst: *mut T, src: T) -> T;
222 pub fn atomic_or_rel<T>(dst: *mut T, src: T) -> T;
223 pub fn atomic_or_acqrel<T>(dst: *mut T, src: T) -> T;
224 pub fn atomic_or_relaxed<T>(dst: *mut T, src: T) -> T;
226 pub fn atomic_xor<T>(dst: *mut T, src: T) -> T;
227 pub fn atomic_xor_acq<T>(dst: *mut T, src: T) -> T;
228 pub fn atomic_xor_rel<T>(dst: *mut T, src: T) -> T;
229 pub fn atomic_xor_acqrel<T>(dst: *mut T, src: T) -> T;
230 pub fn atomic_xor_relaxed<T>(dst: *mut T, src: T) -> T;
232 pub fn atomic_max<T>(dst: *mut T, src: T) -> T;
233 pub fn atomic_max_acq<T>(dst: *mut T, src: T) -> T;
234 pub fn atomic_max_rel<T>(dst: *mut T, src: T) -> T;
235 pub fn atomic_max_acqrel<T>(dst: *mut T, src: T) -> T;
236 pub fn atomic_max_relaxed<T>(dst: *mut T, src: T) -> T;
238 pub fn atomic_min<T>(dst: *mut T, src: T) -> T;
239 pub fn atomic_min_acq<T>(dst: *mut T, src: T) -> T;
240 pub fn atomic_min_rel<T>(dst: *mut T, src: T) -> T;
241 pub fn atomic_min_acqrel<T>(dst: *mut T, src: T) -> T;
242 pub fn atomic_min_relaxed<T>(dst: *mut T, src: T) -> T;
244 pub fn atomic_umin<T>(dst: *mut T, src: T) -> T;
245 pub fn atomic_umin_acq<T>(dst: *mut T, src: T) -> T;
246 pub fn atomic_umin_rel<T>(dst: *mut T, src: T) -> T;
247 pub fn atomic_umin_acqrel<T>(dst: *mut T, src: T) -> T;
248 pub fn atomic_umin_relaxed<T>(dst: *mut T, src: T) -> T;
250 pub fn atomic_umax<T>(dst: *mut T, src: T) -> T;
251 pub fn atomic_umax_acq<T>(dst: *mut T, src: T) -> T;
252 pub fn atomic_umax_rel<T>(dst: *mut T, src: T) -> T;
253 pub fn atomic_umax_acqrel<T>(dst: *mut T, src: T) -> T;
254 pub fn atomic_umax_relaxed<T>(dst: *mut T, src: T) -> T;
257 extern "rust-intrinsic" {
259 pub fn atomic_fence();
260 pub fn atomic_fence_acq();
261 pub fn atomic_fence_rel();
262 pub fn atomic_fence_acqrel();
264 /// Abort the execution of the process.
267 /// Execute a breakpoint trap, for inspection by a debugger.
270 /// The size of a type in bytes.
272 /// This is the exact number of bytes in memory taken up by a
273 /// value of the given type. In other words, a memset of this size
274 /// would *exactly* overwrite a value. When laid out in vectors
275 /// and structures there may be additional padding between
277 pub fn size_of<T>() -> uint;
279 /// Move a value to an uninitialized memory location.
281 /// Drop glue is not run on the destination.
282 pub fn move_val_init<T>(dst: &mut T, src: T);
284 pub fn min_align_of<T>() -> uint;
285 pub fn pref_align_of<T>() -> uint;
287 /// Get a static pointer to a type descriptor.
288 pub fn get_tydesc<T>() -> *TyDesc;
290 /// Gets an identifier which is globally unique to the specified type. This
291 /// function will return the same value for a type regardless of whichever
292 /// crate it is invoked in.
293 pub fn type_id<T: 'static>() -> TypeId;
296 /// Create a value initialized to zero.
298 /// `init` is unsafe because it returns a zeroed-out datum,
299 /// which is unsafe unless T is Copy.
300 pub fn init<T>() -> T;
302 /// Create an uninitialized value.
303 pub fn uninit<T>() -> T;
305 /// Move a value out of scope without running drop glue.
307 /// `forget` is unsafe because the caller is responsible for
308 /// ensuring the argument is deallocated already.
309 pub fn forget<T>(_: T) -> ();
311 /// Unsafely transforms a value of one type into a value of another type.
313 /// Both types must have the same size and alignment, and this guarantee
314 /// is enforced at compile-time.
321 /// let v: &[u8] = unsafe { mem::transmute("L") };
322 /// assert!(v == [76u8]);
324 pub fn transmute<T,U>(e: T) -> U;
326 /// Returns `true` if a type requires drop glue.
327 pub fn needs_drop<T>() -> bool;
329 /// Returns `true` if a type is managed (will be allocated on the local heap)
330 pub fn owns_managed<T>() -> bool;
332 pub fn visit_tydesc(td: *TyDesc, tv: &mut TyVisitor);
334 /// Calculates the offset from a pointer. The offset *must* be in-bounds of
335 /// the object, or one-byte-past-the-end. An arithmetic overflow is also
336 /// undefined behaviour.
338 /// This is implemented as an intrinsic to avoid converting to and from an
339 /// integer, since the conversion would throw away aliasing information.
340 pub fn offset<T>(dst: *T, offset: int) -> *T;
342 /// Equivalent to the appropriate `llvm.memcpy.p0i8.0i8.*` intrinsic, with
343 /// a size of `count` * `size_of::<T>()` and an alignment of
344 /// `min_align_of::<T>()`
345 pub fn copy_nonoverlapping_memory<T>(dst: *mut T, src: *T, count: uint);
347 /// Equivalent to the appropriate `llvm.memmove.p0i8.0i8.*` intrinsic, with
348 /// a size of `count` * `size_of::<T>()` and an alignment of
349 /// `min_align_of::<T>()`
350 pub fn copy_memory<T>(dst: *mut T, src: *T, count: uint);
352 /// Equivalent to the appropriate `llvm.memset.p0i8.*` intrinsic, with a
353 /// size of `count` * `size_of::<T>()` and an alignment of
354 /// `min_align_of::<T>()`
355 pub fn set_memory<T>(dst: *mut T, val: u8, count: uint);
357 /// Equivalent to the appropriate `llvm.memcpy.p0i8.0i8.*` intrinsic, with
358 /// a size of `count` * `size_of::<T>()` and an alignment of
359 /// `min_align_of::<T>()`
361 /// The volatile parameter parameter is set to `true`, so it will not be optimized out.
362 pub fn volatile_copy_nonoverlapping_memory<T>(dst: *mut T, src: *T, count: uint);
363 /// Equivalent to the appropriate `llvm.memmove.p0i8.0i8.*` intrinsic, with
364 /// a size of `count` * `size_of::<T>()` and an alignment of
365 /// `min_align_of::<T>()`
367 /// The volatile parameter parameter is set to `true`, so it will not be optimized out.
368 pub fn volatile_copy_memory<T>(dst: *mut T, src: *T, count: uint);
369 /// Equivalent to the appropriate `llvm.memset.p0i8.*` intrinsic, with a
370 /// size of `count` * `size_of::<T>()` and an alignment of
371 /// `min_align_of::<T>()`.
373 /// The volatile parameter parameter is set to `true`, so it will not be optimized out.
374 pub fn volatile_set_memory<T>(dst: *mut T, val: u8, count: uint);
376 /// Perform a volatile load from the `src` pointer.
377 pub fn volatile_load<T>(src: *T) -> T;
378 /// Perform a volatile store to the `dst` pointer.
379 pub fn volatile_store<T>(dst: *mut T, val: T);
381 /// Returns the square root of an `f32`
382 pub fn sqrtf32(x: f32) -> f32;
383 /// Returns the square root of an `f64`
384 pub fn sqrtf64(x: f64) -> f64;
386 /// Raises an `f32` to an integer power.
387 pub fn powif32(a: f32, x: i32) -> f32;
388 /// Raises an `f64` to an integer power.
389 pub fn powif64(a: f64, x: i32) -> f64;
391 /// Returns the sine of an `f32`.
392 pub fn sinf32(x: f32) -> f32;
393 /// Returns the sine of an `f64`.
394 pub fn sinf64(x: f64) -> f64;
396 /// Returns the cosine of an `f32`.
397 pub fn cosf32(x: f32) -> f32;
398 /// Returns the cosine of an `f64`.
399 pub fn cosf64(x: f64) -> f64;
401 /// Raises an `f32` to an `f32` power.
402 pub fn powf32(a: f32, x: f32) -> f32;
403 /// Raises an `f64` to an `f64` power.
404 pub fn powf64(a: f64, x: f64) -> f64;
406 /// Returns the exponential of an `f32`.
407 pub fn expf32(x: f32) -> f32;
408 /// Returns the exponential of an `f64`.
409 pub fn expf64(x: f64) -> f64;
411 /// Returns 2 raised to the power of an `f32`.
412 pub fn exp2f32(x: f32) -> f32;
413 /// Returns 2 raised to the power of an `f64`.
414 pub fn exp2f64(x: f64) -> f64;
416 /// Returns the natural logarithm of an `f32`.
417 pub fn logf32(x: f32) -> f32;
418 /// Returns the natural logarithm of an `f64`.
419 pub fn logf64(x: f64) -> f64;
421 /// Returns the base 10 logarithm of an `f32`.
422 pub fn log10f32(x: f32) -> f32;
423 /// Returns the base 10 logarithm of an `f64`.
424 pub fn log10f64(x: f64) -> f64;
426 /// Returns the base 2 logarithm of an `f32`.
427 pub fn log2f32(x: f32) -> f32;
428 /// Returns the base 2 logarithm of an `f64`.
429 pub fn log2f64(x: f64) -> f64;
431 /// Returns `a * b + c` for `f32` values.
432 pub fn fmaf32(a: f32, b: f32, c: f32) -> f32;
433 /// Returns `a * b + c` for `f64` values.
434 pub fn fmaf64(a: f64, b: f64, c: f64) -> f64;
436 /// Returns the absolute value of an `f32`.
437 pub fn fabsf32(x: f32) -> f32;
438 /// Returns the absolute value of an `f64`.
439 pub fn fabsf64(x: f64) -> f64;
441 /// Copies the sign from `y` to `x` for `f32` values.
442 pub fn copysignf32(x: f32, y: f32) -> f32;
443 /// Copies the sign from `y` to `x` for `f64` values.
444 pub fn copysignf64(x: f64, y: f64) -> f64;
446 /// Returns the largest integer less than or equal to an `f32`.
447 pub fn floorf32(x: f32) -> f32;
448 /// Returns the largest integer less than or equal to an `f64`.
449 pub fn floorf64(x: f64) -> f64;
451 /// Returns the smallest integer greater than or equal to an `f32`.
452 pub fn ceilf32(x: f32) -> f32;
453 /// Returns the smallest integer greater than or equal to an `f64`.
454 pub fn ceilf64(x: f64) -> f64;
456 /// Returns the integer part of an `f32`.
457 pub fn truncf32(x: f32) -> f32;
458 /// Returns the integer part of an `f64`.
459 pub fn truncf64(x: f64) -> f64;
461 /// Returns the nearest integer to an `f32`. May raise an inexact floating-point exception
462 /// if the argument is not an integer.
463 pub fn rintf32(x: f32) -> f32;
464 /// Returns the nearest integer to an `f64`. May raise an inexact floating-point exception
465 /// if the argument is not an integer.
466 pub fn rintf64(x: f64) -> f64;
468 /// Returns the nearest integer to an `f32`.
469 pub fn nearbyintf32(x: f32) -> f32;
470 /// Returns the nearest integer to an `f64`.
471 pub fn nearbyintf64(x: f64) -> f64;
473 /// Returns the nearest integer to an `f32`. Rounds half-way cases away from zero.
474 pub fn roundf32(x: f32) -> f32;
475 /// Returns the nearest integer to an `f64`. Rounds half-way cases away from zero.
476 pub fn roundf64(x: f64) -> f64;
478 /// Returns the number of bits set in a `u8`.
479 pub fn ctpop8(x: u8) -> u8;
480 /// Returns the number of bits set in a `u16`.
481 pub fn ctpop16(x: u16) -> u16;
482 /// Returns the number of bits set in a `u32`.
483 pub fn ctpop32(x: u32) -> u32;
484 /// Returns the number of bits set in a `u64`.
485 pub fn ctpop64(x: u64) -> u64;
487 /// Returns the number of leading bits unset in a `u8`.
488 pub fn ctlz8(x: u8) -> u8;
489 /// Returns the number of leading bits unset in a `u16`.
490 pub fn ctlz16(x: u16) -> u16;
491 /// Returns the number of leading bits unset in a `u32`.
492 pub fn ctlz32(x: u32) -> u32;
493 /// Returns the number of leading bits unset in a `u64`.
494 pub fn ctlz64(x: u64) -> u64;
496 /// Returns the number of trailing bits unset in a `u8`.
497 pub fn cttz8(x: u8) -> u8;
498 /// Returns the number of trailing bits unset in a `u16`.
499 pub fn cttz16(x: u16) -> u16;
500 /// Returns the number of trailing bits unset in a `u32`.
501 pub fn cttz32(x: u32) -> u32;
502 /// Returns the number of trailing bits unset in a `u64`.
503 pub fn cttz64(x: u64) -> u64;
505 /// Reverses the bytes in a `u16`.
506 pub fn bswap16(x: u16) -> u16;
507 /// Reverses the bytes in a `u32`.
508 pub fn bswap32(x: u32) -> u32;
509 /// Reverses the bytes in a `u64`.
510 pub fn bswap64(x: u64) -> u64;
512 /// Performs checked `i8` addition.
513 pub fn i8_add_with_overflow(x: i8, y: i8) -> (i8, bool);
514 /// Performs checked `i16` addition.
515 pub fn i16_add_with_overflow(x: i16, y: i16) -> (i16, bool);
516 /// Performs checked `i32` addition.
517 pub fn i32_add_with_overflow(x: i32, y: i32) -> (i32, bool);
518 /// Performs checked `i64` addition.
519 pub fn i64_add_with_overflow(x: i64, y: i64) -> (i64, bool);
521 /// Performs checked `u8` addition.
522 pub fn u8_add_with_overflow(x: u8, y: u8) -> (u8, bool);
523 /// Performs checked `u16` addition.
524 pub fn u16_add_with_overflow(x: u16, y: u16) -> (u16, bool);
525 /// Performs checked `u32` addition.
526 pub fn u32_add_with_overflow(x: u32, y: u32) -> (u32, bool);
527 /// Performs checked `u64` addition.
528 pub fn u64_add_with_overflow(x: u64, y: u64) -> (u64, bool);
530 /// Performs checked `i8` subtraction.
531 pub fn i8_sub_with_overflow(x: i8, y: i8) -> (i8, bool);
532 /// Performs checked `i16` subtraction.
533 pub fn i16_sub_with_overflow(x: i16, y: i16) -> (i16, bool);
534 /// Performs checked `i32` subtraction.
535 pub fn i32_sub_with_overflow(x: i32, y: i32) -> (i32, bool);
536 /// Performs checked `i64` subtraction.
537 pub fn i64_sub_with_overflow(x: i64, y: i64) -> (i64, bool);
539 /// Performs checked `u8` subtraction.
540 pub fn u8_sub_with_overflow(x: u8, y: u8) -> (u8, bool);
541 /// Performs checked `u16` subtraction.
542 pub fn u16_sub_with_overflow(x: u16, y: u16) -> (u16, bool);
543 /// Performs checked `u32` subtraction.
544 pub fn u32_sub_with_overflow(x: u32, y: u32) -> (u32, bool);
545 /// Performs checked `u64` subtraction.
546 pub fn u64_sub_with_overflow(x: u64, y: u64) -> (u64, bool);
548 /// Performs checked `i8` multiplication.
549 pub fn i8_mul_with_overflow(x: i8, y: i8) -> (i8, bool);
550 /// Performs checked `i16` multiplication.
551 pub fn i16_mul_with_overflow(x: i16, y: i16) -> (i16, bool);
552 /// Performs checked `i32` multiplication.
553 pub fn i32_mul_with_overflow(x: i32, y: i32) -> (i32, bool);
554 /// Performs checked `i64` multiplication.
555 pub fn i64_mul_with_overflow(x: i64, y: i64) -> (i64, bool);
557 /// Performs checked `u8` multiplication.
558 pub fn u8_mul_with_overflow(x: u8, y: u8) -> (u8, bool);
559 /// Performs checked `u16` multiplication.
560 pub fn u16_mul_with_overflow(x: u16, y: u16) -> (u16, bool);
561 /// Performs checked `u32` multiplication.
562 pub fn u32_mul_with_overflow(x: u32, y: u32) -> (u32, bool);
563 /// Performs checked `u64` multiplication.
564 pub fn u64_mul_with_overflow(x: u64, y: u64) -> (u64, bool);
568 /// `TypeId` represents a globally unique identifier for a type
569 #[lang="type_id"] // This needs to be kept in lockstep with the code in trans/intrinsic.rs and
570 // middle/lang_items.rs
571 #[deriving(PartialEq, Eq, Show)]
579 /// Returns the `TypeId` of the type this generic function has been instantiated with
580 pub fn of<T: 'static>() -> TypeId {
581 unsafe { type_id::<T>() }
583 pub fn hash(&self) -> u64 { self.t }