1 use std::convert::TryInto;
3 use rustc_apfloat::Float;
4 use rustc::ty::layout::{Align, LayoutOf, Size};
5 use rustc::hir::def_id::DefId;
8 use syntax::symbol::sym;
12 impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
13 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
14 /// Returns the minimum alignment for the target architecture for allocations of the given size.
15 fn min_align(&self, size: u64, kind: MiriMemoryKind) -> Align {
16 let this = self.eval_context_ref();
17 // List taken from `libstd/sys_common/alloc.rs`.
18 let min_align = match this.tcx.tcx.sess.target.target.arch.as_str() {
19 "x86" | "arm" | "mips" | "powerpc" | "powerpc64" | "asmjs" | "wasm32" => 8,
20 "x86_64" | "aarch64" | "mips64" | "s390x" | "sparc64" => 16,
21 arch => bug!("Unsupported target architecture: {}", arch),
23 // Windows always aligns, even small allocations.
24 // Source: <https://support.microsoft.com/en-us/help/286470/how-to-use-pageheap-exe-in-windows-xp-windows-2000-and-windows-server>
25 // But jemalloc does not, so for the C heap we only align if the allocation is sufficiently big.
26 if kind == MiriMemoryKind::WinHeap || size >= min_align {
27 return Align::from_bytes(min_align).unwrap();
29 // We have `size < min_align`. Round `size` *down* to the next power of two and use that.
30 fn prev_power_of_two(x: u64) -> u64 {
31 let next_pow2 = x.next_power_of_two();
33 // x *is* a power of two, just use that.
36 // x is between two powers, so next = 2*prev.
40 Align::from_bytes(prev_power_of_two(size)).unwrap()
49 let this = self.eval_context_mut();
50 let tcx = &{this.tcx.tcx};
52 Scalar::from_int(0, this.pointer_size())
54 let align = this.min_align(size, kind);
55 let ptr = this.memory_mut().allocate(Size::from_bytes(size), align, kind.into());
57 // We just allocated this, the access cannot fail
59 .get_mut(ptr.alloc_id).unwrap()
60 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
70 ) -> InterpResult<'tcx> {
71 let this = self.eval_context_mut();
72 if !this.is_null(ptr)? {
73 let ptr = this.force_ptr(ptr)?;
74 this.memory_mut().deallocate(
88 ) -> InterpResult<'tcx, Scalar<Tag>> {
89 let this = self.eval_context_mut();
90 let new_align = this.min_align(new_size, kind);
91 if this.is_null(old_ptr)? {
93 Ok(Scalar::from_int(0, this.pointer_size()))
95 let new_ptr = this.memory_mut().allocate(
96 Size::from_bytes(new_size),
100 Ok(Scalar::Ptr(new_ptr))
103 let old_ptr = this.force_ptr(old_ptr)?;
104 let memory = this.memory_mut();
111 Ok(Scalar::from_int(0, this.pointer_size()))
113 let new_ptr = memory.reallocate(
116 Size::from_bytes(new_size),
120 Ok(Scalar::Ptr(new_ptr))
125 /// Emulates calling a foreign item, failing if the item is not supported.
126 /// This function will handle `goto_block` if needed.
127 fn emulate_foreign_item(
130 args: &[OpTy<'tcx, Tag>],
131 dest: Option<PlaceTy<'tcx, Tag>>,
132 ret: Option<mir::BasicBlock>,
133 ) -> InterpResult<'tcx> {
134 let this = self.eval_context_mut();
135 let attrs = this.tcx.get_attrs(def_id);
136 let link_name = match attr::first_attr_value_str_by_name(&attrs, sym::link_name) {
137 Some(name) => name.as_str(),
138 None => this.tcx.item_name(def_id).as_str(),
140 // Strip linker suffixes (seen on 32-bit macOS).
141 let link_name = link_name.get().trim_end_matches("$UNIX2003");
142 let tcx = &{this.tcx.tcx};
144 // First: functions that diverge.
146 "__rust_start_panic" | "panic_impl" => {
147 throw_unsup_format!("the evaluated program panicked");
149 "exit" | "ExitProcess" => {
150 // it's really u32 for ExitProcess, but we have to put it into the `Exit` error variant anyway
151 let code = this.read_scalar(args[0])?.to_i32()?;
152 return Err(InterpError::Exit(code).into());
154 _ => if dest.is_none() {
155 throw_unsup_format!("can't call (diverging) foreign function: {}", link_name);
159 // Next: functions that assume a ret and dest.
160 let dest = dest.expect("we already checked for a dest");
161 let ret = ret.expect("dest is `Some` but ret is `None`");
164 let size = this.read_scalar(args[0])?.to_usize(this)?;
165 let res = this.malloc(size, /*zero_init:*/ false, MiriMemoryKind::C);
166 this.write_scalar(res, dest)?;
169 let items = this.read_scalar(args[0])?.to_usize(this)?;
170 let len = this.read_scalar(args[1])?.to_usize(this)?;
171 let size = items.checked_mul(len).ok_or_else(|| err_panic!(Overflow(mir::BinOp::Mul)))?;
172 let res = this.malloc(size, /*zero_init:*/ true, MiriMemoryKind::C);
173 this.write_scalar(res, dest)?;
175 "posix_memalign" => {
176 let ret = this.deref_operand(args[0])?;
177 let align = this.read_scalar(args[1])?.to_usize(this)?;
178 let size = this.read_scalar(args[2])?.to_usize(this)?;
179 // Align must be power of 2, and also at least ptr-sized (POSIX rules).
180 if !align.is_power_of_two() {
181 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
183 if align < this.pointer_size().bytes() {
185 "posix_memalign: alignment must be at least the size of a pointer, but is {}",
191 this.write_null(ret.into())?;
193 let ptr = this.memory_mut().allocate(
194 Size::from_bytes(size),
195 Align::from_bytes(align).unwrap(),
196 MiriMemoryKind::C.into()
198 this.write_scalar(Scalar::Ptr(ptr), ret.into())?;
200 this.write_null(dest)?;
203 let ptr = this.read_scalar(args[0])?.not_undef()?;
204 this.free(ptr, MiriMemoryKind::C)?;
207 let old_ptr = this.read_scalar(args[0])?.not_undef()?;
208 let new_size = this.read_scalar(args[1])?.to_usize(this)?;
209 let res = this.realloc(old_ptr, new_size, MiriMemoryKind::C)?;
210 this.write_scalar(res, dest)?;
214 let size = this.read_scalar(args[0])?.to_usize(this)?;
215 let align = this.read_scalar(args[1])?.to_usize(this)?;
217 throw_unsup!(HeapAllocZeroBytes);
219 if !align.is_power_of_two() {
220 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
222 let ptr = this.memory_mut()
224 Size::from_bytes(size),
225 Align::from_bytes(align).unwrap(),
226 MiriMemoryKind::Rust.into()
228 this.write_scalar(Scalar::Ptr(ptr), dest)?;
230 "__rust_alloc_zeroed" => {
231 let size = this.read_scalar(args[0])?.to_usize(this)?;
232 let align = this.read_scalar(args[1])?.to_usize(this)?;
234 throw_unsup!(HeapAllocZeroBytes);
236 if !align.is_power_of_two() {
237 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
239 let ptr = this.memory_mut()
241 Size::from_bytes(size),
242 Align::from_bytes(align).unwrap(),
243 MiriMemoryKind::Rust.into()
245 // We just allocated this, the access cannot fail
247 .get_mut(ptr.alloc_id).unwrap()
248 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
249 this.write_scalar(Scalar::Ptr(ptr), dest)?;
251 "__rust_dealloc" => {
252 let ptr = this.read_scalar(args[0])?.not_undef()?;
253 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
254 let align = this.read_scalar(args[2])?.to_usize(this)?;
256 throw_unsup!(HeapAllocZeroBytes);
258 if !align.is_power_of_two() {
259 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
261 let ptr = this.force_ptr(ptr)?;
262 this.memory_mut().deallocate(
264 Some((Size::from_bytes(old_size), Align::from_bytes(align).unwrap())),
265 MiriMemoryKind::Rust.into(),
268 "__rust_realloc" => {
269 let ptr = this.read_scalar(args[0])?.to_ptr()?;
270 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
271 let align = this.read_scalar(args[2])?.to_usize(this)?;
272 let new_size = this.read_scalar(args[3])?.to_usize(this)?;
273 if old_size == 0 || new_size == 0 {
274 throw_unsup!(HeapAllocZeroBytes);
276 if !align.is_power_of_two() {
277 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
279 let align = Align::from_bytes(align).unwrap();
280 let new_ptr = this.memory_mut().reallocate(
282 Some((Size::from_bytes(old_size), align)),
283 Size::from_bytes(new_size),
285 MiriMemoryKind::Rust.into(),
287 this.write_scalar(Scalar::Ptr(new_ptr), dest)?;
291 let sys_getrandom = this.eval_path_scalar(&["libc", "SYS_getrandom"])?
292 .expect("Failed to get libc::SYS_getrandom")
295 // `libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)`
296 // is called if a `HashMap` is created the regular way (e.g. HashMap<K, V>).
297 match this.read_scalar(args[0])?.to_usize(this)? {
298 id if id == sys_getrandom => {
299 // The first argument is the syscall id,
301 linux_getrandom(this, &args[1..], dest)?;
304 throw_unsup_format!("miri does not support syscall ID {}", id)
310 linux_getrandom(this, args, dest)?;
314 let _handle = this.read_scalar(args[0])?;
315 let symbol = this.read_scalar(args[1])?.not_undef()?;
316 let symbol_name = this.memory().read_c_str(symbol)?;
317 let err = format!("bad c unicode symbol: {:?}", symbol_name);
318 let symbol_name = ::std::str::from_utf8(symbol_name).unwrap_or(&err);
319 if let Some(dlsym) = Dlsym::from_str(symbol_name)? {
320 let ptr = this.memory_mut().create_fn_alloc(FnVal::Other(dlsym));
321 this.write_scalar(Scalar::from(ptr), dest)?;
323 this.write_null(dest)?;
327 "__rust_maybe_catch_panic" => {
328 // fn __rust_maybe_catch_panic(
331 // data_ptr: *mut usize,
332 // vtable_ptr: *mut usize,
334 // We abort on panic, so not much is going on here, but we still have to call the closure.
335 let f = this.read_scalar(args[0])?.not_undef()?;
336 let data = this.read_scalar(args[1])?.not_undef()?;
337 let f_instance = this.memory().get_fn(f)?.as_instance()?;
338 this.write_null(dest)?;
339 trace!("__rust_maybe_catch_panic: {:?}", f_instance);
341 // Now we make a function call.
342 // TODO: consider making this reusable? `InterpCx::step` does something similar
343 // for the TLS destructors, and of course `eval_main`.
344 let mir = this.load_mir(f_instance.def)?;
345 let ret_place = MPlaceTy::dangling(this.layout_of(this.tcx.mk_unit())?, this).into();
346 this.push_stack_frame(
351 // Directly return to caller.
352 StackPopCleanup::Goto(Some(ret)),
354 let mut args = this.frame().body.args_iter();
356 let arg_local = args.next()
357 .expect("Argument to __rust_maybe_catch_panic does not take enough arguments.");
358 let arg_dest = this.local_place(arg_local)?;
359 this.write_scalar(data, arg_dest)?;
361 assert!(args.next().is_none(), "__rust_maybe_catch_panic argument has more arguments than expected");
363 // We ourselves will return `0`, eventually (because we will not return if we paniced).
364 this.write_null(dest)?;
366 // Don't fall through, we do *not* want to `goto_block`!
371 let left = this.read_scalar(args[0])?.not_undef()?;
372 let right = this.read_scalar(args[1])?.not_undef()?;
373 let n = Size::from_bytes(this.read_scalar(args[2])?.to_usize(this)?);
376 let left_bytes = this.memory().read_bytes(left, n)?;
377 let right_bytes = this.memory().read_bytes(right, n)?;
379 use std::cmp::Ordering::*;
380 match left_bytes.cmp(right_bytes) {
388 Scalar::from_int(result, Size::from_bits(32)),
394 let ptr = this.read_scalar(args[0])?.not_undef()?;
395 let val = this.read_scalar(args[1])?.to_i32()? as u8;
396 let num = this.read_scalar(args[2])?.to_usize(this)?;
397 if let Some(idx) = this.memory().read_bytes(ptr, Size::from_bytes(num))?
398 .iter().rev().position(|&c| c == val)
400 let new_ptr = ptr.ptr_offset(Size::from_bytes(num - idx as u64 - 1), this)?;
401 this.write_scalar(new_ptr, dest)?;
403 this.write_null(dest)?;
408 let ptr = this.read_scalar(args[0])?.not_undef()?;
409 let val = this.read_scalar(args[1])?.to_i32()? as u8;
410 let num = this.read_scalar(args[2])?.to_usize(this)?;
413 .read_bytes(ptr, Size::from_bytes(num))?
415 .position(|&c| c == val);
416 if let Some(idx) = idx {
417 let new_ptr = ptr.ptr_offset(Size::from_bytes(idx as u64), this)?;
418 this.write_scalar(new_ptr, dest)?;
420 this.write_null(dest)?;
426 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
427 let name = this.memory().read_c_str(name_ptr)?;
428 match this.machine.env_vars.get(name) {
429 Some(&var) => Scalar::Ptr(var),
430 None => Scalar::ptr_null(&*this.tcx),
433 this.write_scalar(result, dest)?;
437 let mut success = None;
439 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
440 if !this.is_null(name_ptr)? {
441 let name = this.memory().read_c_str(name_ptr)?.to_owned();
442 if !name.is_empty() && !name.contains(&b'=') {
443 success = Some(this.machine.env_vars.remove(&name));
447 if let Some(old) = success {
448 if let Some(var) = old {
449 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
451 this.write_null(dest)?;
453 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
460 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
461 let value_ptr = this.read_scalar(args[1])?.not_undef()?;
462 let value = this.memory().read_c_str(value_ptr)?;
463 if !this.is_null(name_ptr)? {
464 let name = this.memory().read_c_str(name_ptr)?;
465 if !name.is_empty() && !name.contains(&b'=') {
466 new = Some((name.to_owned(), value.to_owned()));
470 if let Some((name, value)) = new {
471 // `+1` for the null terminator.
472 let value_copy = this.memory_mut().allocate(
473 Size::from_bytes((value.len() + 1) as u64),
474 Align::from_bytes(1).unwrap(),
475 MiriMemoryKind::Env.into(),
477 // We just allocated these, so the write cannot fail.
478 let alloc = this.memory_mut().get_mut(value_copy.alloc_id).unwrap();
479 alloc.write_bytes(tcx, value_copy, &value).unwrap();
480 let trailing_zero_ptr = value_copy.offset(
481 Size::from_bytes(value.len() as u64),
484 alloc.write_bytes(tcx, trailing_zero_ptr, &[0]).unwrap();
486 if let Some(var) = this.machine.env_vars.insert(
491 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
493 this.write_null(dest)?;
495 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
500 let fd = this.read_scalar(args[0])?.to_i32()?;
501 let buf = this.read_scalar(args[1])?.not_undef()?;
502 let n = this.read_scalar(args[2])?.to_usize(&*this.tcx)?;
503 trace!("Called write({:?}, {:?}, {:?})", fd, buf, n);
504 let result = if fd == 1 || fd == 2 {
506 use std::io::{self, Write};
508 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(n))?;
509 // We need to flush to make sure this actually appears on the screen
510 let res = if fd == 1 {
511 // Stdout is buffered, flush to make sure it appears on the screen.
512 // This is the write() syscall of the interpreted program, we want it
513 // to correspond to a write() syscall on the host -- there is no good
514 // in adding extra buffering here.
515 let res = io::stdout().write(buf_cont);
516 io::stdout().flush().unwrap();
519 // No need to flush, stderr is not buffered.
520 io::stderr().write(buf_cont)
527 eprintln!("Miri: Ignored output to FD {}", fd);
528 // Pretend it all went well.
531 // Now, `result` is the value we return back to the program.
533 Scalar::from_int(result, dest.layout.size),
539 let ptr = this.read_scalar(args[0])?.not_undef()?;
540 let n = this.memory().read_c_str(ptr)?.len();
541 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
546 "cbrtf" | "coshf" | "sinhf" |"tanf" => {
547 // FIXME: Using host floats.
548 let f = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
549 let f = match link_name {
556 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
558 // underscore case for windows
559 "_hypotf" | "hypotf" | "atan2f" => {
560 // FIXME: Using host floats.
561 let f1 = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
562 let f2 = f32::from_bits(this.read_scalar(args[1])?.to_u32()?);
563 let n = match link_name {
564 "_hypotf" | "hypotf" => f1.hypot(f2),
565 "atan2f" => f1.atan2(f2),
568 this.write_scalar(Scalar::from_u32(n.to_bits()), dest)?;
571 "cbrt" | "cosh" | "sinh" | "tan" => {
572 // FIXME: Using host floats.
573 let f = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
574 let f = match link_name {
581 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
583 // underscore case for windows
584 "_hypot" | "hypot" | "atan2" => {
585 // FIXME: Using host floats.
586 let f1 = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
587 let f2 = f64::from_bits(this.read_scalar(args[1])?.to_u64()?);
588 let n = match link_name {
589 "_hypot" | "hypot" => f1.hypot(f2),
590 "atan2" => f1.atan2(f2),
593 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
595 // underscore case for windows
596 "_ldexp" | "ldexp" => {
597 let x = this.read_scalar(args[0])?.to_f64()?;
598 let exp = this.read_scalar(args[1])?.to_i32()?;
599 // For radix-2 (binary) systems, `ldexp` and `scalbn` are the same.
600 let res = x.scalbn(exp.try_into().unwrap());
601 this.write_scalar(Scalar::from_f64(res), dest)?;
604 // Some things needed for `sys::thread` initialization to go through.
605 "signal" | "sigaction" | "sigaltstack" => {
606 this.write_scalar(Scalar::from_int(0, dest.layout.size), dest)?;
610 let name = this.read_scalar(args[0])?.to_i32()?;
612 trace!("sysconf() called with name {}", name);
613 // TODO: Cache the sysconf integers via Miri's global cache.
615 (&["libc", "_SC_PAGESIZE"], Scalar::from_int(PAGE_SIZE, dest.layout.size)),
616 (&["libc", "_SC_GETPW_R_SIZE_MAX"], Scalar::from_int(-1, dest.layout.size)),
617 (&["libc", "_SC_NPROCESSORS_ONLN"], Scalar::from_int(NUM_CPUS, dest.layout.size)),
619 let mut result = None;
620 for &(path, path_value) in paths {
621 if let Some(val) = this.eval_path_scalar(path)? {
622 let val = val.to_i32()?;
624 result = Some(path_value);
630 if let Some(result) = result {
631 this.write_scalar(result, dest)?;
633 throw_unsup_format!("Unimplemented sysconf name: {}", name)
637 "sched_getaffinity" => {
638 // Return an error; `num_cpus` then falls back to `sysconf`.
639 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
643 this.write_null(dest)?;
646 // Hook pthread calls that go to the thread-local storage memory subsystem.
647 "pthread_key_create" => {
648 let key_ptr = this.read_scalar(args[0])?.not_undef()?;
650 // Extract the function type out of the signature (that seems easier than constructing it ourselves).
651 let dtor = match this.test_null(this.read_scalar(args[1])?.not_undef()?)? {
652 Some(dtor_ptr) => Some(this.memory().get_fn(dtor_ptr)?.as_instance()?),
656 // Figure out how large a pthread TLS key actually is.
657 // This is `libc::pthread_key_t`.
658 let key_type = args[0].layout.ty
660 .ok_or_else(|| err_ub_format!(
661 "wrong signature used for `pthread_key_create`: first argument must be a raw pointer."
664 let key_layout = this.layout_of(key_type)?;
666 // Create key and write it into the memory where `key_ptr` wants it.
667 let key = this.machine.tls.create_tls_key(dtor) as u128;
668 if key_layout.size.bits() < 128 && key >= (1u128 << key_layout.size.bits() as u128) {
669 throw_unsup!(OutOfTls);
672 let key_ptr = this.memory().check_ptr_access(key_ptr, key_layout.size, key_layout.align.abi)?
673 .expect("cannot be a ZST");
674 this.memory_mut().get_mut(key_ptr.alloc_id)?.write_scalar(
677 Scalar::from_uint(key, key_layout.size).into(),
681 // Return success (`0`).
682 this.write_null(dest)?;
684 "pthread_key_delete" => {
685 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
686 this.machine.tls.delete_tls_key(key)?;
687 // Return success (0)
688 this.write_null(dest)?;
690 "pthread_getspecific" => {
691 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
692 let ptr = this.machine.tls.load_tls(key, tcx)?;
693 this.write_scalar(ptr, dest)?;
695 "pthread_setspecific" => {
696 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
697 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
698 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
700 // Return success (`0`).
701 this.write_null(dest)?;
704 // Stack size/address stuff.
705 "pthread_attr_init" | "pthread_attr_destroy" | "pthread_self" |
706 "pthread_attr_setstacksize" => {
707 this.write_null(dest)?;
709 "pthread_attr_getstack" => {
710 let addr_place = this.deref_operand(args[1])?;
711 let size_place = this.deref_operand(args[2])?;
714 Scalar::from_uint(STACK_ADDR, addr_place.layout.size),
718 Scalar::from_uint(STACK_SIZE, size_place.layout.size),
722 // Return success (`0`).
723 this.write_null(dest)?;
726 // We don't support threading. (Also for Windows.)
727 "pthread_create" | "CreateThread" => {
728 throw_unsup_format!("Miri does not support threading");
731 // Stub out calls for condvar, mutex and rwlock, to just return `0`.
732 "pthread_mutexattr_init" | "pthread_mutexattr_settype" | "pthread_mutex_init" |
733 "pthread_mutexattr_destroy" | "pthread_mutex_lock" | "pthread_mutex_unlock" |
734 "pthread_mutex_destroy" | "pthread_rwlock_rdlock" | "pthread_rwlock_unlock" |
735 "pthread_rwlock_wrlock" | "pthread_rwlock_destroy" | "pthread_condattr_init" |
736 "pthread_condattr_setclock" | "pthread_cond_init" | "pthread_condattr_destroy" |
737 "pthread_cond_destroy" => {
738 this.write_null(dest)?;
741 // We don't support fork so we don't have to do anything for atfork.
742 "pthread_atfork" => {
743 this.write_null(dest)?;
747 // This is a horrible hack, but since the guard page mechanism calls mmap and expects a particular return value, we just give it that value.
748 let addr = this.read_scalar(args[0])?.not_undef()?;
749 this.write_scalar(addr, dest)?;
752 this.write_null(dest)?;
756 "pthread_attr_get_np" | "pthread_getattr_np" => {
757 this.write_null(dest)?;
759 "pthread_get_stackaddr_np" => {
760 let stack_addr = Scalar::from_uint(STACK_ADDR, dest.layout.size);
761 this.write_scalar(stack_addr, dest)?;
763 "pthread_get_stacksize_np" => {
764 let stack_size = Scalar::from_uint(STACK_SIZE, dest.layout.size);
765 this.write_scalar(stack_size, dest)?;
768 // FIXME: register the destructor.
771 this.write_scalar(Scalar::Ptr(this.machine.argc.unwrap()), dest)?;
774 this.write_scalar(Scalar::Ptr(this.machine.argv.unwrap()), dest)?;
776 "SecRandomCopyBytes" => {
777 let len = this.read_scalar(args[1])?.to_usize(this)?;
778 let ptr = this.read_scalar(args[2])?.not_undef()?;
779 this.gen_random(ptr, len as usize)?;
780 this.write_null(dest)?;
783 // Windows API stubs.
785 // DWORD = ULONG = u32
787 "GetProcessHeap" => {
788 // Just fake a HANDLE
789 this.write_scalar(Scalar::from_int(1, this.pointer_size()), dest)?;
792 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
793 let flags = this.read_scalar(args[1])?.to_u32()?;
794 let size = this.read_scalar(args[2])?.to_usize(this)?;
795 let zero_init = (flags & 0x00000008) != 0; // HEAP_ZERO_MEMORY
796 let res = this.malloc(size, zero_init, MiriMemoryKind::WinHeap);
797 this.write_scalar(res, dest)?;
800 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
801 let _flags = this.read_scalar(args[1])?.to_u32()?;
802 let ptr = this.read_scalar(args[2])?.not_undef()?;
803 this.free(ptr, MiriMemoryKind::WinHeap)?;
804 this.write_scalar(Scalar::from_int(1, Size::from_bytes(4)), dest)?;
807 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
808 let _flags = this.read_scalar(args[1])?.to_u32()?;
809 let ptr = this.read_scalar(args[2])?.not_undef()?;
810 let size = this.read_scalar(args[3])?.to_usize(this)?;
811 let res = this.realloc(ptr, size, MiriMemoryKind::WinHeap)?;
812 this.write_scalar(res, dest)?;
816 let err = this.read_scalar(args[0])?.to_u32()?;
817 this.machine.last_error = err;
820 this.write_scalar(Scalar::from_u32(this.machine.last_error), dest)?;
823 "AddVectoredExceptionHandler" => {
824 // Any non zero value works for the stdlib. This is just used for stack overflows anyway.
825 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
827 "InitializeCriticalSection" |
828 "EnterCriticalSection" |
829 "LeaveCriticalSection" |
830 "DeleteCriticalSection" => {
831 // Nothing to do, not even a return value.
835 "TryEnterCriticalSection" |
836 "GetConsoleScreenBufferInfo" |
837 "SetConsoleTextAttribute" => {
838 // Pretend these do not exist / nothing happened, by returning zero.
839 this.write_null(dest)?;
842 let system_info = this.deref_operand(args[0])?;
843 let system_info_ptr = this.check_mplace_access(system_info, None)?
844 .expect("cannot be a ZST");
845 // Initialize with `0`.
846 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
847 .write_repeat(tcx, system_info_ptr, 0, system_info.layout.size)?;
848 // Set number of processors.
849 let dword_size = Size::from_bytes(4);
850 let offset = 2*dword_size + 3*tcx.pointer_size();
851 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
854 system_info_ptr.offset(offset, tcx)?,
855 Scalar::from_int(NUM_CPUS, dword_size).into(),
861 // This just creates a key; Windows does not natively support TLS destructors.
863 // Create key and return it.
864 let key = this.machine.tls.create_tls_key(None) as u128;
866 // Figure out how large a TLS key actually is. This is `c::DWORD`.
867 if dest.layout.size.bits() < 128
868 && key >= (1u128 << dest.layout.size.bits() as u128) {
869 throw_unsup!(OutOfTls);
871 this.write_scalar(Scalar::from_uint(key, dest.layout.size), dest)?;
874 let key = this.read_scalar(args[0])?.to_u32()? as u128;
875 let ptr = this.machine.tls.load_tls(key, tcx)?;
876 this.write_scalar(ptr, dest)?;
879 let key = this.read_scalar(args[0])?.to_u32()? as u128;
880 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
881 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
883 // Return success (`1`).
884 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
887 let which = this.read_scalar(args[0])?.to_i32()?;
888 // We just make this the identity function, so we know later in `WriteFile`
890 this.write_scalar(Scalar::from_int(which, this.pointer_size()), dest)?;
893 let handle = this.read_scalar(args[0])?.to_isize(this)?;
894 let buf = this.read_scalar(args[1])?.not_undef()?;
895 let n = this.read_scalar(args[2])?.to_u32()?;
896 let written_place = this.deref_operand(args[3])?;
897 // Spec says to always write `0` first.
898 this.write_null(written_place.into())?;
899 let written = if handle == -11 || handle == -12 {
901 use std::io::{self, Write};
903 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(u64::from(n)))?;
904 let res = if handle == -11 {
905 io::stdout().write(buf_cont)
907 io::stderr().write(buf_cont)
909 res.ok().map(|n| n as u32)
911 eprintln!("Miri: Ignored output to handle {}", handle);
912 // Pretend it all went well.
915 // If there was no error, write back how much was written.
916 if let Some(n) = written {
917 this.write_scalar(Scalar::from_u32(n), written_place.into())?;
919 // Return whether this was a success.
921 Scalar::from_int(if written.is_some() { 1 } else { 0 }, dest.layout.size),
925 "GetConsoleMode" => {
926 // Everything is a pipe.
927 this.write_null(dest)?;
929 "GetEnvironmentVariableW" => {
930 // This is not the env var you are looking for.
931 this.machine.last_error = 203; // ERROR_ENVVAR_NOT_FOUND
932 this.write_null(dest)?;
934 "GetCommandLineW" => {
935 this.write_scalar(Scalar::Ptr(this.machine.cmd_line.unwrap()), dest)?;
937 // The actual name of 'RtlGenRandom'
938 "SystemFunction036" => {
939 let ptr = this.read_scalar(args[0])?.not_undef()?;
940 let len = this.read_scalar(args[1])?.to_u32()?;
941 this.gen_random(ptr, len as usize)?;
942 this.write_scalar(Scalar::from_bool(true), dest)?;
945 // We can't execute anything else.
947 throw_unsup_format!("can't call foreign function: {}", link_name)
951 this.goto_block(Some(ret))?;
952 this.dump_place(*dest);
956 /// Evaluates the scalar at the specified path. Returns Some(val)
957 /// if the path could be resolved, and None otherwise
958 fn eval_path_scalar(&mut self, path: &[&str]) -> InterpResult<'tcx, Option<ScalarMaybeUndef<Tag>>> {
959 let this = self.eval_context_mut();
960 if let Ok(instance) = this.resolve_path(path) {
965 let const_val = this.const_eval_raw(cid)?;
966 let const_val = this.read_scalar(const_val.into())?;
967 return Ok(Some(const_val));
973 // Shims the linux 'getrandom()' syscall.
974 fn linux_getrandom<'tcx>(
975 this: &mut MiriEvalContext<'_, 'tcx>,
976 args: &[OpTy<'tcx, Tag>],
977 dest: PlaceTy<'tcx, Tag>,
978 ) -> InterpResult<'tcx> {
979 let ptr = this.read_scalar(args[0])?.not_undef()?;
980 let len = this.read_scalar(args[1])?.to_usize(this)?;
982 // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
983 // neither of which have any effect on our current PRNG.
984 let _flags = this.read_scalar(args[2])?.to_i32()?;
986 this.gen_random(ptr, len as usize)?;
987 this.write_scalar(Scalar::from_uint(len, dest.layout.size), dest)?;