5 use rustc_apfloat::{Float, Round};
6 use rustc_middle::ty::layout::{IntegerExt, LayoutOf};
7 use rustc_middle::{mir, mir::BinOp, ty, ty::FloatTy};
8 use rustc_target::abi::{Align, Integer};
11 use helpers::check_arg_count;
14 MirOp(mir::BinOp, bool),
19 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
20 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
23 instance: ty::Instance<'tcx>,
24 args: &[OpTy<'tcx, Tag>],
25 ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
26 _unwind: StackPopUnwind,
27 ) -> InterpResult<'tcx> {
28 let this = self.eval_context_mut();
30 if this.emulate_intrinsic(instance, args, ret)? {
34 // All supported intrinsics have a return place.
35 let intrinsic_name = &*this.tcx.item_name(instance.def_id()).as_str();
36 let (dest, ret) = match ret {
37 None => throw_unsup_format!("unimplemented (diverging) intrinsic: {}", intrinsic_name),
41 // Then handle terminating intrinsics.
42 match intrinsic_name {
43 // Miri overwriting CTFE intrinsics.
44 "ptr_guaranteed_eq" => {
45 let &[ref left, ref right] = check_arg_count(args)?;
46 let left = this.read_immediate(left)?;
47 let right = this.read_immediate(right)?;
48 this.binop_ignore_overflow(mir::BinOp::Eq, &left, &right, dest)?;
50 "ptr_guaranteed_ne" => {
51 let &[ref left, ref right] = check_arg_count(args)?;
52 let left = this.read_immediate(left)?;
53 let right = this.read_immediate(right)?;
54 this.binop_ignore_overflow(mir::BinOp::Ne, &left, &right, dest)?;
57 // Raw memory accesses
59 let &[ref place] = check_arg_count(args)?;
60 let place = this.deref_operand(place)?;
61 this.copy_op(&place.into(), dest)?;
64 let &[ref place, ref dest] = check_arg_count(args)?;
65 let place = this.deref_operand(place)?;
66 this.copy_op(dest, &place.into())?;
69 "write_bytes" | "volatile_set_memory" => {
70 let &[ref ptr, ref val_byte, ref count] = check_arg_count(args)?;
71 let ty = instance.substs.type_at(0);
72 let ty_layout = this.layout_of(ty)?;
73 let val_byte = this.read_scalar(val_byte)?.to_u8()?;
74 let ptr = this.read_pointer(ptr)?;
75 let count = this.read_scalar(count)?.to_machine_usize(this)?;
76 let byte_count = ty_layout.size.checked_mul(count, this).ok_or_else(|| {
77 err_ub_format!("overflow computing total size of `{}`", intrinsic_name)
80 .write_bytes(ptr, iter::repeat(val_byte).take(byte_count.bytes() as usize))?;
83 // Floating-point operations
99 let &[ref f] = check_arg_count(args)?;
100 // FIXME: Using host floats.
101 let f = f32::from_bits(this.read_scalar(f)?.to_u32()?);
102 let f = match intrinsic_name {
104 "fabsf32" => f.abs(),
106 "sqrtf32" => f.sqrt(),
108 "exp2f32" => f.exp2(),
110 "log10f32" => f.log10(),
111 "log2f32" => f.log2(),
112 "floorf32" => f.floor(),
113 "ceilf32" => f.ceil(),
114 "truncf32" => f.trunc(),
115 "roundf32" => f.round(),
118 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
136 let &[ref f] = check_arg_count(args)?;
137 // FIXME: Using host floats.
138 let f = f64::from_bits(this.read_scalar(f)?.to_u64()?);
139 let f = match intrinsic_name {
141 "fabsf64" => f.abs(),
143 "sqrtf64" => f.sqrt(),
145 "exp2f64" => f.exp2(),
147 "log10f64" => f.log10(),
148 "log2f64" => f.log2(),
149 "floorf64" => f.floor(),
150 "ceilf64" => f.ceil(),
151 "truncf64" => f.trunc(),
152 "roundf64" => f.round(),
155 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
165 let &[ref a, ref b] = check_arg_count(args)?;
166 let a = this.read_immediate(a)?;
167 let b = this.read_immediate(b)?;
168 let op = match intrinsic_name {
169 "fadd_fast" => mir::BinOp::Add,
170 "fsub_fast" => mir::BinOp::Sub,
171 "fmul_fast" => mir::BinOp::Mul,
172 "fdiv_fast" => mir::BinOp::Div,
173 "frem_fast" => mir::BinOp::Rem,
176 let float_finite = |x: ImmTy<'tcx, _>| -> InterpResult<'tcx, bool> {
177 Ok(match x.layout.ty.kind() {
178 ty::Float(FloatTy::F32) => x.to_scalar()?.to_f32()?.is_finite(),
179 ty::Float(FloatTy::F64) => x.to_scalar()?.to_f64()?.is_finite(),
181 "`{}` called with non-float input type {:?}",
187 match (float_finite(a)?, float_finite(b)?) {
188 (false, false) => throw_ub_format!(
189 "`{}` intrinsic called with non-finite value as both parameters",
192 (false, _) => throw_ub_format!(
193 "`{}` intrinsic called with non-finite value as first parameter",
196 (_, false) => throw_ub_format!(
197 "`{}` intrinsic called with non-finite value as second parameter",
202 this.binop_ignore_overflow(op, &a, &b, dest)?;
210 let &[ref a, ref b] = check_arg_count(args)?;
211 let a = this.read_scalar(a)?.to_f32()?;
212 let b = this.read_scalar(b)?.to_f32()?;
213 let res = match intrinsic_name {
214 "minnumf32" => a.min(b),
215 "maxnumf32" => a.max(b),
216 "copysignf32" => a.copy_sign(b),
219 this.write_scalar(Scalar::from_f32(res), dest)?;
227 let &[ref a, ref b] = check_arg_count(args)?;
228 let a = this.read_scalar(a)?.to_f64()?;
229 let b = this.read_scalar(b)?.to_f64()?;
230 let res = match intrinsic_name {
231 "minnumf64" => a.min(b),
232 "maxnumf64" => a.max(b),
233 "copysignf64" => a.copy_sign(b),
236 this.write_scalar(Scalar::from_f64(res), dest)?;
240 let &[ref f, ref f2] = check_arg_count(args)?;
241 // FIXME: Using host floats.
242 let f = f32::from_bits(this.read_scalar(f)?.to_u32()?);
243 let f2 = f32::from_bits(this.read_scalar(f2)?.to_u32()?);
244 this.write_scalar(Scalar::from_u32(f.powf(f2).to_bits()), dest)?;
248 let &[ref f, ref f2] = check_arg_count(args)?;
249 // FIXME: Using host floats.
250 let f = f64::from_bits(this.read_scalar(f)?.to_u64()?);
251 let f2 = f64::from_bits(this.read_scalar(f2)?.to_u64()?);
252 this.write_scalar(Scalar::from_u64(f.powf(f2).to_bits()), dest)?;
256 let &[ref a, ref b, ref c] = check_arg_count(args)?;
257 let a = this.read_scalar(a)?.to_f32()?;
258 let b = this.read_scalar(b)?.to_f32()?;
259 let c = this.read_scalar(c)?.to_f32()?;
260 let res = a.mul_add(b, c).value;
261 this.write_scalar(Scalar::from_f32(res), dest)?;
265 let &[ref a, ref b, ref c] = check_arg_count(args)?;
266 let a = this.read_scalar(a)?.to_f64()?;
267 let b = this.read_scalar(b)?.to_f64()?;
268 let c = this.read_scalar(c)?.to_f64()?;
269 let res = a.mul_add(b, c).value;
270 this.write_scalar(Scalar::from_f64(res), dest)?;
274 let &[ref f, ref i] = check_arg_count(args)?;
275 // FIXME: Using host floats.
276 let f = f32::from_bits(this.read_scalar(f)?.to_u32()?);
277 let i = this.read_scalar(i)?.to_i32()?;
278 this.write_scalar(Scalar::from_u32(f.powi(i).to_bits()), dest)?;
282 let &[ref f, ref i] = check_arg_count(args)?;
283 // FIXME: Using host floats.
284 let f = f64::from_bits(this.read_scalar(f)?.to_u64()?);
285 let i = this.read_scalar(i)?.to_i32()?;
286 this.write_scalar(Scalar::from_u64(f.powi(i).to_bits()), dest)?;
289 "float_to_int_unchecked" => {
290 let &[ref val] = check_arg_count(args)?;
291 let val = this.read_immediate(val)?;
293 let res = match val.layout.ty.kind() {
294 ty::Float(FloatTy::F32) =>
295 this.float_to_int_unchecked(val.to_scalar()?.to_f32()?, dest.layout.ty)?,
296 ty::Float(FloatTy::F64) =>
297 this.float_to_int_unchecked(val.to_scalar()?.to_f64()?, dest.layout.ty)?,
300 "`float_to_int_unchecked` called with non-float input type {:?}",
305 this.write_scalar(res, dest)?;
309 "atomic_load" => this.atomic_load(args, dest, AtomicReadOp::SeqCst)?,
310 "atomic_load_relaxed" => this.atomic_load(args, dest, AtomicReadOp::Relaxed)?,
311 "atomic_load_acq" => this.atomic_load(args, dest, AtomicReadOp::Acquire)?,
313 "atomic_store" => this.atomic_store(args, AtomicWriteOp::SeqCst)?,
314 "atomic_store_relaxed" => this.atomic_store(args, AtomicWriteOp::Relaxed)?,
315 "atomic_store_rel" => this.atomic_store(args, AtomicWriteOp::Release)?,
317 "atomic_fence_acq" => this.atomic_fence(args, AtomicFenceOp::Acquire)?,
318 "atomic_fence_rel" => this.atomic_fence(args, AtomicFenceOp::Release)?,
319 "atomic_fence_acqrel" => this.atomic_fence(args, AtomicFenceOp::AcqRel)?,
320 "atomic_fence" => this.atomic_fence(args, AtomicFenceOp::SeqCst)?,
322 "atomic_singlethreadfence_acq" => this.compiler_fence(args, AtomicFenceOp::Acquire)?,
323 "atomic_singlethreadfence_rel" => this.compiler_fence(args, AtomicFenceOp::Release)?,
324 "atomic_singlethreadfence_acqrel" =>
325 this.compiler_fence(args, AtomicFenceOp::AcqRel)?,
326 "atomic_singlethreadfence" => this.compiler_fence(args, AtomicFenceOp::SeqCst)?,
328 "atomic_xchg" => this.atomic_exchange(args, dest, AtomicRwOp::SeqCst)?,
329 "atomic_xchg_acq" => this.atomic_exchange(args, dest, AtomicRwOp::Acquire)?,
330 "atomic_xchg_rel" => this.atomic_exchange(args, dest, AtomicRwOp::Release)?,
331 "atomic_xchg_acqrel" => this.atomic_exchange(args, dest, AtomicRwOp::AcqRel)?,
332 "atomic_xchg_relaxed" => this.atomic_exchange(args, dest, AtomicRwOp::Relaxed)?,
336 this.atomic_compare_exchange(args, dest, AtomicRwOp::SeqCst, AtomicReadOp::SeqCst)?,
338 "atomic_cxchg_acq" =>
339 this.atomic_compare_exchange(args, dest, AtomicRwOp::Acquire, AtomicReadOp::Acquire)?,
341 "atomic_cxchg_rel" =>
342 this.atomic_compare_exchange(args, dest, AtomicRwOp::Release, AtomicReadOp::Relaxed)?,
344 "atomic_cxchg_acqrel" =>
345 this.atomic_compare_exchange(args, dest, AtomicRwOp::AcqRel, AtomicReadOp::Acquire)?,
347 "atomic_cxchg_relaxed" =>
348 this.atomic_compare_exchange(args, dest, AtomicRwOp::Relaxed, AtomicReadOp::Relaxed)?,
350 "atomic_cxchg_acq_failrelaxed" =>
351 this.atomic_compare_exchange(args, dest, AtomicRwOp::Acquire, AtomicReadOp::Relaxed)?,
353 "atomic_cxchg_acqrel_failrelaxed" =>
354 this.atomic_compare_exchange(args, dest, AtomicRwOp::AcqRel, AtomicReadOp::Relaxed)?,
356 "atomic_cxchg_failrelaxed" =>
357 this.atomic_compare_exchange(args, dest, AtomicRwOp::SeqCst, AtomicReadOp::Relaxed)?,
359 "atomic_cxchg_failacq" =>
360 this.atomic_compare_exchange(args, dest, AtomicRwOp::SeqCst, AtomicReadOp::Acquire)?,
363 "atomic_cxchgweak" =>
364 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::SeqCst, AtomicReadOp::SeqCst)?,
366 "atomic_cxchgweak_acq" =>
367 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::Acquire, AtomicReadOp::Acquire)?,
369 "atomic_cxchgweak_rel" =>
370 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::Release, AtomicReadOp::Relaxed)?,
372 "atomic_cxchgweak_acqrel" =>
373 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::AcqRel, AtomicReadOp::Acquire)?,
375 "atomic_cxchgweak_relaxed" =>
376 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::Relaxed, AtomicReadOp::Relaxed)?,
378 "atomic_cxchgweak_acq_failrelaxed" =>
379 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::Acquire, AtomicReadOp::Relaxed)?,
381 "atomic_cxchgweak_acqrel_failrelaxed" =>
382 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::AcqRel, AtomicReadOp::Relaxed)?,
384 "atomic_cxchgweak_failrelaxed" =>
385 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::SeqCst, AtomicReadOp::Relaxed)?,
387 "atomic_cxchgweak_failacq" =>
388 this.atomic_compare_exchange_weak(args, dest, AtomicRwOp::SeqCst, AtomicReadOp::Acquire)?,
392 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitOr, false), AtomicRwOp::SeqCst)?,
395 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitOr, false), AtomicRwOp::Acquire)?,
398 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitOr, false), AtomicRwOp::Release)?,
400 "atomic_or_acqrel" =>
401 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitOr, false), AtomicRwOp::AcqRel)?,
403 "atomic_or_relaxed" =>
404 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitOr, false), AtomicRwOp::Relaxed)?,
407 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitXor, false), AtomicRwOp::SeqCst)?,
410 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitXor, false), AtomicRwOp::Acquire)?,
413 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitXor, false), AtomicRwOp::Release)?,
415 "atomic_xor_acqrel" =>
416 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitXor, false), AtomicRwOp::AcqRel)?,
418 "atomic_xor_relaxed" =>
419 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitXor, false), AtomicRwOp::Relaxed)?,
422 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, false), AtomicRwOp::SeqCst)?,
425 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, false), AtomicRwOp::Acquire)?,
428 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, false), AtomicRwOp::Release)?,
430 "atomic_and_acqrel" =>
431 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, false), AtomicRwOp::AcqRel)?,
433 "atomic_and_relaxed" =>
434 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, false), AtomicRwOp::Relaxed)?,
437 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, true), AtomicRwOp::SeqCst)?,
440 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, true), AtomicRwOp::Acquire)?,
443 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, true), AtomicRwOp::Release)?,
445 "atomic_nand_acqrel" =>
446 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, true), AtomicRwOp::AcqRel)?,
448 "atomic_nand_relaxed" =>
449 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::BitAnd, true), AtomicRwOp::Relaxed)?,
452 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Add, false), AtomicRwOp::SeqCst)?,
455 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Add, false), AtomicRwOp::Acquire)?,
458 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Add, false), AtomicRwOp::Release)?,
460 "atomic_xadd_acqrel" =>
461 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Add, false), AtomicRwOp::AcqRel)?,
463 "atomic_xadd_relaxed" =>
464 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Add, false), AtomicRwOp::Relaxed)?,
467 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Sub, false), AtomicRwOp::SeqCst)?,
470 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Sub, false), AtomicRwOp::Acquire)?,
473 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Sub, false), AtomicRwOp::Release)?,
475 "atomic_xsub_acqrel" =>
476 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Sub, false), AtomicRwOp::AcqRel)?,
478 "atomic_xsub_relaxed" =>
479 this.atomic_op(args, dest, AtomicOp::MirOp(BinOp::Sub, false), AtomicRwOp::Relaxed)?,
480 "atomic_min" => this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::SeqCst)?,
481 "atomic_min_acq" => this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::Acquire)?,
482 "atomic_min_rel" => this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::Release)?,
483 "atomic_min_acqrel" => this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::AcqRel)?,
484 "atomic_min_relaxed" =>
485 this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::Relaxed)?,
486 "atomic_max" => this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::SeqCst)?,
487 "atomic_max_acq" => this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::Acquire)?,
488 "atomic_max_rel" => this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::Release)?,
489 "atomic_max_acqrel" => this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::AcqRel)?,
490 "atomic_max_relaxed" =>
491 this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::Relaxed)?,
492 "atomic_umin" => this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::SeqCst)?,
493 "atomic_umin_acq" => this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::Acquire)?,
494 "atomic_umin_rel" => this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::Release)?,
495 "atomic_umin_acqrel" =>
496 this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::AcqRel)?,
497 "atomic_umin_relaxed" =>
498 this.atomic_op(args, dest, AtomicOp::Min, AtomicRwOp::Relaxed)?,
499 "atomic_umax" => this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::SeqCst)?,
500 "atomic_umax_acq" => this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::Acquire)?,
501 "atomic_umax_rel" => this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::Release)?,
502 "atomic_umax_acqrel" =>
503 this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::AcqRel)?,
504 "atomic_umax_relaxed" =>
505 this.atomic_op(args, dest, AtomicOp::Max, AtomicRwOp::Relaxed)?,
507 // Query type information
508 "assert_zero_valid" | "assert_uninit_valid" => {
509 let &[] = check_arg_count(args)?;
510 let ty = instance.substs.type_at(0);
511 let layout = this.layout_of(ty)?;
512 // Abort here because the caller might not be panic safe.
513 if layout.abi.is_uninhabited() {
514 // Use this message even for the other intrinsics, as that's what codegen does
515 throw_machine_stop!(TerminationInfo::Abort(format!(
516 "aborted execution: attempted to instantiate uninhabited type `{}`",
520 if intrinsic_name == "assert_zero_valid"
521 && !layout.might_permit_raw_init(this, /*zero:*/ true)
523 throw_machine_stop!(TerminationInfo::Abort(format!(
524 "aborted execution: attempted to zero-initialize type `{}`, which is invalid",
528 if intrinsic_name == "assert_uninit_valid"
529 && !layout.might_permit_raw_init(this, /*zero:*/ false)
531 throw_machine_stop!(TerminationInfo::Abort(format!(
532 "aborted execution: attempted to leave type `{}` uninitialized, which is invalid",
540 let &[ref num, ref denom] = check_arg_count(args)?;
541 this.exact_div(&this.read_immediate(num)?, &this.read_immediate(denom)?, dest)?;
544 "try" => return this.handle_try(args, dest, ret),
547 let &[] = check_arg_count(args)?;
548 // normally this would raise a SIGTRAP, which aborts if no debugger is connected
549 throw_machine_stop!(TerminationInfo::Abort("Trace/breakpoint trap".to_string()))
552 name => throw_unsup_format!("unimplemented intrinsic: {}", name),
555 trace!("{:?}", this.dump_place(**dest));
556 this.go_to_block(ret);
562 args: &[OpTy<'tcx, Tag>],
563 dest: &PlaceTy<'tcx, Tag>,
564 atomic: AtomicReadOp,
565 ) -> InterpResult<'tcx> {
566 let this = self.eval_context_mut();
568 let &[ref place] = check_arg_count(args)?;
569 let place = this.deref_operand(place)?;
571 // make sure it fits into a scalar; otherwise it cannot be atomic
572 let val = this.read_scalar_atomic(&place, atomic)?;
574 // Check alignment requirements. Atomics must always be aligned to their size,
575 // even if the type they wrap would be less aligned (e.g. AtomicU64 on 32bit must
577 let align = Align::from_bytes(place.layout.size.bytes()).unwrap();
578 this.memory.check_ptr_access_align(
582 CheckInAllocMsg::MemoryAccessTest,
584 // Perform regular access.
585 this.write_scalar(val, dest)?;
591 args: &[OpTy<'tcx, Tag>],
592 atomic: AtomicWriteOp,
593 ) -> InterpResult<'tcx> {
594 let this = self.eval_context_mut();
596 let &[ref place, ref val] = check_arg_count(args)?;
597 let place = this.deref_operand(place)?;
598 let val = this.read_scalar(val)?; // make sure it fits into a scalar; otherwise it cannot be atomic
600 // Check alignment requirements. Atomics must always be aligned to their size,
601 // even if the type they wrap would be less aligned (e.g. AtomicU64 on 32bit must
603 let align = Align::from_bytes(place.layout.size.bytes()).unwrap();
604 this.memory.check_ptr_access_align(
608 CheckInAllocMsg::MemoryAccessTest,
611 // Perform atomic store
612 this.write_scalar_atomic(val, &place, atomic)?;
618 args: &[OpTy<'tcx, Tag>],
619 atomic: AtomicFenceOp,
620 ) -> InterpResult<'tcx> {
621 let &[] = check_arg_count(args)?;
623 //FIXME: compiler fences are currently ignored
629 args: &[OpTy<'tcx, Tag>],
630 atomic: AtomicFenceOp,
631 ) -> InterpResult<'tcx> {
632 let this = self.eval_context_mut();
633 let &[] = check_arg_count(args)?;
634 this.validate_atomic_fence(atomic)?;
640 args: &[OpTy<'tcx, Tag>],
641 dest: &PlaceTy<'tcx, Tag>,
644 ) -> InterpResult<'tcx> {
645 let this = self.eval_context_mut();
647 let &[ref place, ref rhs] = check_arg_count(args)?;
648 let place = this.deref_operand(place)?;
650 if !place.layout.ty.is_integral() {
651 bug!("Atomic arithmetic operations only work on integer types");
653 let rhs = this.read_immediate(rhs)?;
655 // Check alignment requirements. Atomics must always be aligned to their size,
656 // even if the type they wrap would be less aligned (e.g. AtomicU64 on 32bit must
658 let align = Align::from_bytes(place.layout.size.bytes()).unwrap();
659 this.memory.check_ptr_access_align(
663 CheckInAllocMsg::MemoryAccessTest,
668 let old = this.atomic_min_max_scalar(&place, rhs, true, atomic)?;
669 this.write_immediate(*old, &dest)?; // old value is returned
673 let old = this.atomic_min_max_scalar(&place, rhs, false, atomic)?;
674 this.write_immediate(*old, &dest)?; // old value is returned
677 AtomicOp::MirOp(op, neg) => {
678 let old = this.atomic_op_immediate(&place, &rhs, op, neg, atomic)?;
679 this.write_immediate(*old, dest)?; // old value is returned
687 args: &[OpTy<'tcx, Tag>],
688 dest: &PlaceTy<'tcx, Tag>,
690 ) -> InterpResult<'tcx> {
691 let this = self.eval_context_mut();
693 let &[ref place, ref new] = check_arg_count(args)?;
694 let place = this.deref_operand(place)?;
695 let new = this.read_scalar(new)?;
697 // Check alignment requirements. Atomics must always be aligned to their size,
698 // even if the type they wrap would be less aligned (e.g. AtomicU64 on 32bit must
700 let align = Align::from_bytes(place.layout.size.bytes()).unwrap();
701 this.memory.check_ptr_access_align(
705 CheckInAllocMsg::MemoryAccessTest,
708 let old = this.atomic_exchange_scalar(&place, new, atomic)?;
709 this.write_scalar(old, dest)?; // old value is returned
713 fn atomic_compare_exchange_impl(
715 args: &[OpTy<'tcx, Tag>],
716 dest: &PlaceTy<'tcx, Tag>,
719 can_fail_spuriously: bool,
720 ) -> InterpResult<'tcx> {
721 let this = self.eval_context_mut();
723 let &[ref place, ref expect_old, ref new] = check_arg_count(args)?;
724 let place = this.deref_operand(place)?;
725 let expect_old = this.read_immediate(expect_old)?; // read as immediate for the sake of `binary_op()`
726 let new = this.read_scalar(new)?;
728 // Check alignment requirements. Atomics must always be aligned to their size,
729 // even if the type they wrap would be less aligned (e.g. AtomicU64 on 32bit must
731 let align = Align::from_bytes(place.layout.size.bytes()).unwrap();
732 this.memory.check_ptr_access_align(
736 CheckInAllocMsg::MemoryAccessTest,
739 let old = this.atomic_compare_exchange_scalar(
749 this.write_immediate(old, dest)?;
753 fn atomic_compare_exchange(
755 args: &[OpTy<'tcx, Tag>],
756 dest: &PlaceTy<'tcx, Tag>,
759 ) -> InterpResult<'tcx> {
760 self.atomic_compare_exchange_impl(args, dest, success, fail, false)
763 fn atomic_compare_exchange_weak(
765 args: &[OpTy<'tcx, Tag>],
766 dest: &PlaceTy<'tcx, Tag>,
769 ) -> InterpResult<'tcx> {
770 self.atomic_compare_exchange_impl(args, dest, success, fail, true)
773 fn float_to_int_unchecked<F>(
776 dest_ty: ty::Ty<'tcx>,
777 ) -> InterpResult<'tcx, Scalar<Tag>>
779 F: Float + Into<Scalar<Tag>>,
781 let this = self.eval_context_ref();
783 // Step 1: cut off the fractional part of `f`. The result of this is
784 // guaranteed to be precisely representable in IEEE floats.
785 let f = f.round_to_integral(Round::TowardZero).value;
787 // Step 2: Cast the truncated float to the target integer type and see if we lose any information in this step.
788 Ok(match dest_ty.kind() {
791 let size = Integer::from_uint_ty(this, *t).size();
792 let res = f.to_u128(size.bits_usize());
793 if res.status.is_empty() {
794 // No status flags means there was no further rounding or other loss of precision.
795 Scalar::from_uint(res.value, size)
797 // `f` was not representable in this integer type.
799 "`float_to_int_unchecked` intrinsic called on {} which cannot be represented in target type `{:?}`",
807 let size = Integer::from_int_ty(this, *t).size();
808 let res = f.to_i128(size.bits_usize());
809 if res.status.is_empty() {
810 // No status flags means there was no further rounding or other loss of precision.
811 Scalar::from_int(res.value, size)
813 // `f` was not representable in this integer type.
815 "`float_to_int_unchecked` intrinsic called on {} which cannot be represented in target type `{:?}`",
822 _ => bug!("`float_to_int_unchecked` called with non-int output type {:?}", dest_ty),