1 use rustc::ty::layout::{Align, LayoutOf, Size};
2 use rustc::hir::def_id::DefId;
5 use syntax::symbol::sym;
9 impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
10 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
11 /// Returns the minimum alignment for the target architecture for allocations of the given size.
12 fn min_align(&self, size: u64, kind: MiriMemoryKind) -> Align {
13 let this = self.eval_context_ref();
14 // List taken from `libstd/sys_common/alloc.rs`.
15 let min_align = match this.tcx.tcx.sess.target.target.arch.as_str() {
16 "x86" | "arm" | "mips" | "powerpc" | "powerpc64" | "asmjs" | "wasm32" => 8,
17 "x86_64" | "aarch64" | "mips64" | "s390x" | "sparc64" => 16,
18 arch => bug!("Unsupported target architecture: {}", arch),
20 // Windows always aligns, even small allocations.
21 // Source: <https://support.microsoft.com/en-us/help/286470/how-to-use-pageheap-exe-in-windows-xp-windows-2000-and-windows-server>
22 // But jemalloc does not, so for the C heap we only align if the allocation is sufficiently big.
23 if kind == MiriMemoryKind::WinHeap || size >= min_align {
24 return Align::from_bytes(min_align).unwrap();
26 // We have `size < min_align`. Round `size` *down* to the next power of two and use that.
27 fn prev_power_of_two(x: u64) -> u64 {
28 let next_pow2 = x.next_power_of_two();
30 // x *is* a power of two, just use that.
33 // x is between two powers, so next = 2*prev.
37 Align::from_bytes(prev_power_of_two(size)).unwrap()
46 let this = self.eval_context_mut();
47 let tcx = &{this.tcx.tcx};
49 Scalar::from_int(0, this.pointer_size())
51 let align = this.min_align(size, kind);
52 let ptr = this.memory_mut().allocate(Size::from_bytes(size), align, kind.into());
54 // We just allocated this, the access cannot fail
56 .get_mut(ptr.alloc_id).unwrap()
57 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
67 ) -> InterpResult<'tcx> {
68 let this = self.eval_context_mut();
69 if !this.is_null(ptr)? {
70 let ptr = this.force_ptr(ptr)?;
71 this.memory_mut().deallocate(
85 ) -> InterpResult<'tcx, Scalar<Tag>> {
86 let this = self.eval_context_mut();
87 let new_align = this.min_align(new_size, kind);
88 if this.is_null(old_ptr)? {
90 Ok(Scalar::from_int(0, this.pointer_size()))
92 let new_ptr = this.memory_mut().allocate(
93 Size::from_bytes(new_size),
97 Ok(Scalar::Ptr(new_ptr))
100 let old_ptr = this.force_ptr(old_ptr)?;
101 let memory = this.memory_mut();
108 Ok(Scalar::from_int(0, this.pointer_size()))
110 let new_ptr = memory.reallocate(
113 Size::from_bytes(new_size),
117 Ok(Scalar::Ptr(new_ptr))
122 /// Emulates calling a foreign item, failing if the item is not supported.
123 /// This function will handle `goto_block` if needed.
124 fn emulate_foreign_item(
127 args: &[OpTy<'tcx, Tag>],
128 dest: Option<PlaceTy<'tcx, Tag>>,
129 ret: Option<mir::BasicBlock>,
130 ) -> InterpResult<'tcx> {
131 let this = self.eval_context_mut();
132 let attrs = this.tcx.get_attrs(def_id);
133 let link_name = match attr::first_attr_value_str_by_name(&attrs, sym::link_name) {
134 Some(name) => name.as_str(),
135 None => this.tcx.item_name(def_id).as_str(),
137 // Strip linker suffixes (seen on 32-bit macOS).
138 let link_name = link_name.get().trim_end_matches("$UNIX2003");
139 let tcx = &{this.tcx.tcx};
141 // First: functions that diverge.
143 "__rust_start_panic" | "panic_impl" => {
144 throw_unsup_format!("the evaluated program panicked");
146 "exit" | "ExitProcess" => {
147 // it's really u32 for ExitProcess, but we have to put it into the `Exit` error variant anyway
148 let code = this.read_scalar(args[0])?.to_i32()?;
149 return Err(InterpError::Exit(code).into());
151 _ => if dest.is_none() {
152 throw_unsup_format!("can't call (diverging) foreign function: {}", link_name);
156 // Next: functions that assume a ret and dest.
157 let dest = dest.expect("we already checked for a dest");
158 let ret = ret.expect("dest is `Some` but ret is `None`");
161 let size = this.read_scalar(args[0])?.to_usize(this)?;
162 let res = this.malloc(size, /*zero_init:*/ false, MiriMemoryKind::C);
163 this.write_scalar(res, dest)?;
166 let items = this.read_scalar(args[0])?.to_usize(this)?;
167 let len = this.read_scalar(args[1])?.to_usize(this)?;
168 let size = items.checked_mul(len).ok_or_else(|| err_panic!(Overflow(mir::BinOp::Mul)))?;
169 let res = this.malloc(size, /*zero_init:*/ true, MiriMemoryKind::C);
170 this.write_scalar(res, dest)?;
172 "posix_memalign" => {
173 let ret = this.deref_operand(args[0])?;
174 let align = this.read_scalar(args[1])?.to_usize(this)?;
175 let size = this.read_scalar(args[2])?.to_usize(this)?;
176 // Align must be power of 2, and also at least ptr-sized (POSIX rules).
177 if !align.is_power_of_two() {
178 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
180 if align < this.pointer_size().bytes() {
182 "posix_memalign: alignment must be at least the size of a pointer, but is {}",
188 this.write_null(ret.into())?;
190 let ptr = this.memory_mut().allocate(
191 Size::from_bytes(size),
192 Align::from_bytes(align).unwrap(),
193 MiriMemoryKind::C.into()
195 this.write_scalar(Scalar::Ptr(ptr), ret.into())?;
197 this.write_null(dest)?;
200 let ptr = this.read_scalar(args[0])?.not_undef()?;
201 this.free(ptr, MiriMemoryKind::C)?;
204 let old_ptr = this.read_scalar(args[0])?.not_undef()?;
205 let new_size = this.read_scalar(args[1])?.to_usize(this)?;
206 let res = this.realloc(old_ptr, new_size, MiriMemoryKind::C)?;
207 this.write_scalar(res, dest)?;
211 let size = this.read_scalar(args[0])?.to_usize(this)?;
212 let align = this.read_scalar(args[1])?.to_usize(this)?;
214 throw_unsup!(HeapAllocZeroBytes);
216 if !align.is_power_of_two() {
217 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
219 let ptr = this.memory_mut()
221 Size::from_bytes(size),
222 Align::from_bytes(align).unwrap(),
223 MiriMemoryKind::Rust.into()
225 this.write_scalar(Scalar::Ptr(ptr), dest)?;
227 "__rust_alloc_zeroed" => {
228 let size = this.read_scalar(args[0])?.to_usize(this)?;
229 let align = this.read_scalar(args[1])?.to_usize(this)?;
231 throw_unsup!(HeapAllocZeroBytes);
233 if !align.is_power_of_two() {
234 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
236 let ptr = this.memory_mut()
238 Size::from_bytes(size),
239 Align::from_bytes(align).unwrap(),
240 MiriMemoryKind::Rust.into()
242 // We just allocated this, the access cannot fail
244 .get_mut(ptr.alloc_id).unwrap()
245 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
246 this.write_scalar(Scalar::Ptr(ptr), dest)?;
248 "__rust_dealloc" => {
249 let ptr = this.read_scalar(args[0])?.not_undef()?;
250 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
251 let align = this.read_scalar(args[2])?.to_usize(this)?;
253 throw_unsup!(HeapAllocZeroBytes);
255 if !align.is_power_of_two() {
256 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
258 let ptr = this.force_ptr(ptr)?;
259 this.memory_mut().deallocate(
261 Some((Size::from_bytes(old_size), Align::from_bytes(align).unwrap())),
262 MiriMemoryKind::Rust.into(),
265 "__rust_realloc" => {
266 let ptr = this.read_scalar(args[0])?.to_ptr()?;
267 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
268 let align = this.read_scalar(args[2])?.to_usize(this)?;
269 let new_size = this.read_scalar(args[3])?.to_usize(this)?;
270 if old_size == 0 || new_size == 0 {
271 throw_unsup!(HeapAllocZeroBytes);
273 if !align.is_power_of_two() {
274 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
276 let align = Align::from_bytes(align).unwrap();
277 let new_ptr = this.memory_mut().reallocate(
279 Some((Size::from_bytes(old_size), align)),
280 Size::from_bytes(new_size),
282 MiriMemoryKind::Rust.into(),
284 this.write_scalar(Scalar::Ptr(new_ptr), dest)?;
288 let sys_getrandom = this.eval_path_scalar(&["libc", "SYS_getrandom"])?
289 .expect("Failed to get libc::SYS_getrandom")
292 // `libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)`
293 // is called if a `HashMap` is created the regular way (e.g. HashMap<K, V>).
294 match this.read_scalar(args[0])?.to_usize(this)? {
295 id if id == sys_getrandom => {
296 // The first argument is the syscall id,
298 linux_getrandom(this, &args[1..], dest)?;
301 throw_unsup_format!("miri does not support syscall ID {}", id)
307 linux_getrandom(this, args, dest)?;
311 let _handle = this.read_scalar(args[0])?;
312 let symbol = this.read_scalar(args[1])?.not_undef()?;
313 let symbol_name = this.memory().read_c_str(symbol)?;
314 let err = format!("bad c unicode symbol: {:?}", symbol_name);
315 let symbol_name = ::std::str::from_utf8(symbol_name).unwrap_or(&err);
316 if let Some(dlsym) = Dlsym::from_str(symbol_name)? {
317 let ptr = this.memory_mut().create_fn_alloc(FnVal::Other(dlsym));
318 this.write_scalar(Scalar::from(ptr), dest)?;
320 this.write_null(dest)?;
324 "__rust_maybe_catch_panic" => {
325 // fn __rust_maybe_catch_panic(
328 // data_ptr: *mut usize,
329 // vtable_ptr: *mut usize,
331 // We abort on panic, so not much is going on here, but we still have to call the closure.
332 let f = this.read_scalar(args[0])?.not_undef()?;
333 let data = this.read_scalar(args[1])?.not_undef()?;
334 let f_instance = this.memory().get_fn(f)?.as_instance()?;
335 this.write_null(dest)?;
336 trace!("__rust_maybe_catch_panic: {:?}", f_instance);
338 // Now we make a function call.
339 // TODO: consider making this reusable? `InterpCx::step` does something similar
340 // for the TLS destructors, and of course `eval_main`.
341 let mir = this.load_mir(f_instance.def)?;
342 let ret_place = MPlaceTy::dangling(this.layout_of(this.tcx.mk_unit())?, this).into();
343 this.push_stack_frame(
348 // Directly return to caller.
349 StackPopCleanup::Goto(Some(ret)),
351 let mut args = this.frame().body.args_iter();
353 let arg_local = args.next()
354 .expect("Argument to __rust_maybe_catch_panic does not take enough arguments.");
355 let arg_dest = this.local_place(arg_local)?;
356 this.write_scalar(data, arg_dest)?;
358 assert!(args.next().is_none(), "__rust_maybe_catch_panic argument has more arguments than expected");
360 // We ourselves will return `0`, eventually (because we will not return if we paniced).
361 this.write_null(dest)?;
363 // Don't fall through, we do *not* want to `goto_block`!
368 let left = this.read_scalar(args[0])?.not_undef()?;
369 let right = this.read_scalar(args[1])?.not_undef()?;
370 let n = Size::from_bytes(this.read_scalar(args[2])?.to_usize(this)?);
373 let left_bytes = this.memory().read_bytes(left, n)?;
374 let right_bytes = this.memory().read_bytes(right, n)?;
376 use std::cmp::Ordering::*;
377 match left_bytes.cmp(right_bytes) {
385 Scalar::from_int(result, Size::from_bits(32)),
391 let ptr = this.read_scalar(args[0])?.not_undef()?;
392 let val = this.read_scalar(args[1])?.to_i32()? as u8;
393 let num = this.read_scalar(args[2])?.to_usize(this)?;
394 if let Some(idx) = this.memory().read_bytes(ptr, Size::from_bytes(num))?
395 .iter().rev().position(|&c| c == val)
397 let new_ptr = ptr.ptr_offset(Size::from_bytes(num - idx as u64 - 1), this)?;
398 this.write_scalar(new_ptr, dest)?;
400 this.write_null(dest)?;
405 let ptr = this.read_scalar(args[0])?.not_undef()?;
406 let val = this.read_scalar(args[1])?.to_i32()? as u8;
407 let num = this.read_scalar(args[2])?.to_usize(this)?;
410 .read_bytes(ptr, Size::from_bytes(num))?
412 .position(|&c| c == val);
413 if let Some(idx) = idx {
414 let new_ptr = ptr.ptr_offset(Size::from_bytes(idx as u64), this)?;
415 this.write_scalar(new_ptr, dest)?;
417 this.write_null(dest)?;
423 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
424 let name = this.memory().read_c_str(name_ptr)?;
425 match this.machine.env_vars.get(name) {
426 Some(&var) => Scalar::Ptr(var),
427 None => Scalar::ptr_null(&*this.tcx),
430 this.write_scalar(result, dest)?;
434 let mut success = None;
436 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
437 if !this.is_null(name_ptr)? {
438 let name = this.memory().read_c_str(name_ptr)?.to_owned();
439 if !name.is_empty() && !name.contains(&b'=') {
440 success = Some(this.machine.env_vars.remove(&name));
444 if let Some(old) = success {
445 if let Some(var) = old {
446 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
448 this.write_null(dest)?;
450 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
457 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
458 let value_ptr = this.read_scalar(args[1])?.not_undef()?;
459 let value = this.memory().read_c_str(value_ptr)?;
460 if !this.is_null(name_ptr)? {
461 let name = this.memory().read_c_str(name_ptr)?;
462 if !name.is_empty() && !name.contains(&b'=') {
463 new = Some((name.to_owned(), value.to_owned()));
467 if let Some((name, value)) = new {
468 // `+1` for the null terminator.
469 let value_copy = this.memory_mut().allocate(
470 Size::from_bytes((value.len() + 1) as u64),
471 Align::from_bytes(1).unwrap(),
472 MiriMemoryKind::Env.into(),
474 // We just allocated these, so the write cannot fail.
475 let alloc = this.memory_mut().get_mut(value_copy.alloc_id).unwrap();
476 alloc.write_bytes(tcx, value_copy, &value).unwrap();
477 let trailing_zero_ptr = value_copy.offset(
478 Size::from_bytes(value.len() as u64),
481 alloc.write_bytes(tcx, trailing_zero_ptr, &[0]).unwrap();
483 if let Some(var) = this.machine.env_vars.insert(
488 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
490 this.write_null(dest)?;
492 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
497 let fd = this.read_scalar(args[0])?.to_i32()?;
498 let buf = this.read_scalar(args[1])?.not_undef()?;
499 let n = this.read_scalar(args[2])?.to_usize(&*this.tcx)?;
500 trace!("Called write({:?}, {:?}, {:?})", fd, buf, n);
501 let result = if fd == 1 || fd == 2 {
503 use std::io::{self, Write};
505 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(n))?;
506 // We need to flush to make sure this actually appears on the screen
507 let res = if fd == 1 {
508 // Stdout is buffered, flush to make sure it appears on the screen.
509 // This is the write() syscall of the interpreted program, we want it
510 // to correspond to a write() syscall on the host -- there is no good
511 // in adding extra buffering here.
512 let res = io::stdout().write(buf_cont);
513 io::stdout().flush().unwrap();
516 // No need to flush, stderr is not buffered.
517 io::stderr().write(buf_cont)
524 eprintln!("Miri: Ignored output to FD {}", fd);
525 // Pretend it all went well.
528 // Now, `result` is the value we return back to the program.
530 Scalar::from_int(result, dest.layout.size),
536 let ptr = this.read_scalar(args[0])?.not_undef()?;
537 let n = this.memory().read_c_str(ptr)?.len();
538 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
543 "cbrtf" | "coshf" | "sinhf" |"tanf" => {
544 // FIXME: Using host floats.
545 let f = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
546 let f = match link_name {
553 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
555 // underscore case for windows
556 "_hypotf" | "hypotf" | "atan2f" => {
557 // FIXME: Using host floats.
558 let f1 = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
559 let f2 = f32::from_bits(this.read_scalar(args[1])?.to_u32()?);
560 let n = match link_name {
561 "_hypotf" | "hypotf" => f1.hypot(f2),
562 "atan2f" => f1.atan2(f2),
565 this.write_scalar(Scalar::from_u32(n.to_bits()), dest)?;
568 "cbrt" | "cosh" | "sinh" | "tan" => {
569 // FIXME: Using host floats.
570 let f = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
571 let f = match link_name {
578 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
580 // underscore case for windows
581 "_hypot" | "hypot" | "atan2" => {
582 // FIXME: Using host floats.
583 let f1 = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
584 let f2 = f64::from_bits(this.read_scalar(args[1])?.to_u64()?);
585 let n = match link_name {
586 "_hypot" | "hypot" => f1.hypot(f2),
587 "atan2" => f1.atan2(f2),
590 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
592 // underscore case for windows
593 "_ldexp" | "ldexp" => {
594 // FIXME: Using host floats.
595 let x = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
596 let exp = this.read_scalar(args[1])?.to_i32()?;
597 // FIXME: We should use cmath if there are any imprecisions.
598 let n = x * 2.0f64.powi(exp);
599 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
602 // Some things needed for `sys::thread` initialization to go through.
603 "signal" | "sigaction" | "sigaltstack" => {
604 this.write_scalar(Scalar::from_int(0, dest.layout.size), dest)?;
608 let name = this.read_scalar(args[0])?.to_i32()?;
610 trace!("sysconf() called with name {}", name);
611 // TODO: Cache the sysconf integers via Miri's global cache.
613 (&["libc", "_SC_PAGESIZE"], Scalar::from_int(PAGE_SIZE, dest.layout.size)),
614 (&["libc", "_SC_GETPW_R_SIZE_MAX"], Scalar::from_int(-1, dest.layout.size)),
615 (&["libc", "_SC_NPROCESSORS_ONLN"], Scalar::from_int(NUM_CPUS, dest.layout.size)),
617 let mut result = None;
618 for &(path, path_value) in paths {
619 if let Some(val) = this.eval_path_scalar(path)? {
620 let val = val.to_i32()?;
622 result = Some(path_value);
628 if let Some(result) = result {
629 this.write_scalar(result, dest)?;
631 throw_unsup_format!("Unimplemented sysconf name: {}", name)
635 "sched_getaffinity" => {
636 // Return an error; `num_cpus` then falls back to `sysconf`.
637 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
641 this.write_null(dest)?;
644 // Hook pthread calls that go to the thread-local storage memory subsystem.
645 "pthread_key_create" => {
646 let key_ptr = this.read_scalar(args[0])?.not_undef()?;
648 // Extract the function type out of the signature (that seems easier than constructing it ourselves).
649 let dtor = match this.test_null(this.read_scalar(args[1])?.not_undef()?)? {
650 Some(dtor_ptr) => Some(this.memory().get_fn(dtor_ptr)?.as_instance()?),
654 // Figure out how large a pthread TLS key actually is.
655 // This is `libc::pthread_key_t`.
656 let key_type = args[0].layout.ty
658 .ok_or_else(|| err_ub!(Ub(format!(
659 "wrong signature used for `pthread_key_create`: first argument must be a raw pointer."
662 let key_layout = this.layout_of(key_type)?;
664 // Create key and write it into the memory where `key_ptr` wants it.
665 let key = this.machine.tls.create_tls_key(dtor) as u128;
666 if key_layout.size.bits() < 128 && key >= (1u128 << key_layout.size.bits() as u128) {
667 throw_unsup!(OutOfTls);
670 let key_ptr = this.memory().check_ptr_access(key_ptr, key_layout.size, key_layout.align.abi)?
671 .expect("cannot be a ZST");
672 this.memory_mut().get_mut(key_ptr.alloc_id)?.write_scalar(
675 Scalar::from_uint(key, key_layout.size).into(),
679 // Return success (`0`).
680 this.write_null(dest)?;
682 "pthread_key_delete" => {
683 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
684 this.machine.tls.delete_tls_key(key)?;
685 // Return success (0)
686 this.write_null(dest)?;
688 "pthread_getspecific" => {
689 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
690 let ptr = this.machine.tls.load_tls(key, tcx)?;
691 this.write_scalar(ptr, dest)?;
693 "pthread_setspecific" => {
694 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
695 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
696 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
698 // Return success (`0`).
699 this.write_null(dest)?;
702 // Stack size/address stuff.
703 "pthread_attr_init" | "pthread_attr_destroy" | "pthread_self" |
704 "pthread_attr_setstacksize" => {
705 this.write_null(dest)?;
707 "pthread_attr_getstack" => {
708 let addr_place = this.deref_operand(args[1])?;
709 let size_place = this.deref_operand(args[2])?;
712 Scalar::from_uint(STACK_ADDR, addr_place.layout.size),
716 Scalar::from_uint(STACK_SIZE, size_place.layout.size),
720 // Return success (`0`).
721 this.write_null(dest)?;
724 // We don't support threading. (Also for Windows.)
725 "pthread_create" | "CreateThread" => {
726 throw_unsup_format!("Miri does not support threading");
729 // Stub out calls for condvar, mutex and rwlock, to just return `0`.
730 "pthread_mutexattr_init" | "pthread_mutexattr_settype" | "pthread_mutex_init" |
731 "pthread_mutexattr_destroy" | "pthread_mutex_lock" | "pthread_mutex_unlock" |
732 "pthread_mutex_destroy" | "pthread_rwlock_rdlock" | "pthread_rwlock_unlock" |
733 "pthread_rwlock_wrlock" | "pthread_rwlock_destroy" | "pthread_condattr_init" |
734 "pthread_condattr_setclock" | "pthread_cond_init" | "pthread_condattr_destroy" |
735 "pthread_cond_destroy" => {
736 this.write_null(dest)?;
739 // We don't support fork so we don't have to do anything for atfork.
740 "pthread_atfork" => {
741 this.write_null(dest)?;
745 // 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.
746 let addr = this.read_scalar(args[0])?.not_undef()?;
747 this.write_scalar(addr, dest)?;
750 this.write_null(dest)?;
754 "pthread_attr_get_np" | "pthread_getattr_np" => {
755 this.write_null(dest)?;
757 "pthread_get_stackaddr_np" => {
758 let stack_addr = Scalar::from_uint(STACK_ADDR, dest.layout.size);
759 this.write_scalar(stack_addr, dest)?;
761 "pthread_get_stacksize_np" => {
762 let stack_size = Scalar::from_uint(STACK_SIZE, dest.layout.size);
763 this.write_scalar(stack_size, dest)?;
766 // FIXME: register the destructor.
769 this.write_scalar(Scalar::Ptr(this.machine.argc.unwrap()), dest)?;
772 this.write_scalar(Scalar::Ptr(this.machine.argv.unwrap()), dest)?;
774 "SecRandomCopyBytes" => {
775 let len = this.read_scalar(args[1])?.to_usize(this)?;
776 let ptr = this.read_scalar(args[2])?.not_undef()?;
777 this.gen_random(ptr, len as usize)?;
778 this.write_null(dest)?;
781 // Windows API stubs.
783 // DWORD = ULONG = u32
785 "GetProcessHeap" => {
786 // Just fake a HANDLE
787 this.write_scalar(Scalar::from_int(1, this.pointer_size()), dest)?;
790 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
791 let flags = this.read_scalar(args[1])?.to_u32()?;
792 let size = this.read_scalar(args[2])?.to_usize(this)?;
793 let zero_init = (flags & 0x00000008) != 0; // HEAP_ZERO_MEMORY
794 let res = this.malloc(size, zero_init, MiriMemoryKind::WinHeap);
795 this.write_scalar(res, dest)?;
798 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
799 let _flags = this.read_scalar(args[1])?.to_u32()?;
800 let ptr = this.read_scalar(args[2])?.not_undef()?;
801 this.free(ptr, MiriMemoryKind::WinHeap)?;
802 this.write_scalar(Scalar::from_int(1, Size::from_bytes(4)), dest)?;
805 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
806 let _flags = this.read_scalar(args[1])?.to_u32()?;
807 let ptr = this.read_scalar(args[2])?.not_undef()?;
808 let size = this.read_scalar(args[3])?.to_usize(this)?;
809 let res = this.realloc(ptr, size, MiriMemoryKind::WinHeap)?;
810 this.write_scalar(res, dest)?;
814 let err = this.read_scalar(args[0])?.to_u32()?;
815 this.machine.last_error = err;
818 this.write_scalar(Scalar::from_u32(this.machine.last_error), dest)?;
821 "AddVectoredExceptionHandler" => {
822 // Any non zero value works for the stdlib. This is just used for stack overflows anyway.
823 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
825 "InitializeCriticalSection" |
826 "EnterCriticalSection" |
827 "LeaveCriticalSection" |
828 "DeleteCriticalSection" => {
829 // Nothing to do, not even a return value.
833 "TryEnterCriticalSection" |
834 "GetConsoleScreenBufferInfo" |
835 "SetConsoleTextAttribute" => {
836 // Pretend these do not exist / nothing happened, by returning zero.
837 this.write_null(dest)?;
840 let system_info = this.deref_operand(args[0])?;
841 let system_info_ptr = this.check_mplace_access(system_info, None)?
842 .expect("cannot be a ZST");
843 // Initialize with `0`.
844 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
845 .write_repeat(tcx, system_info_ptr, 0, system_info.layout.size)?;
846 // Set number of processors.
847 let dword_size = Size::from_bytes(4);
848 let offset = 2*dword_size + 3*tcx.pointer_size();
849 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
852 system_info_ptr.offset(offset, tcx)?,
853 Scalar::from_int(NUM_CPUS, dword_size).into(),
859 // This just creates a key; Windows does not natively support TLS destructors.
861 // Create key and return it.
862 let key = this.machine.tls.create_tls_key(None) as u128;
864 // Figure out how large a TLS key actually is. This is `c::DWORD`.
865 if dest.layout.size.bits() < 128
866 && key >= (1u128 << dest.layout.size.bits() as u128) {
867 throw_unsup!(OutOfTls);
869 this.write_scalar(Scalar::from_uint(key, dest.layout.size), dest)?;
872 let key = this.read_scalar(args[0])?.to_u32()? as u128;
873 let ptr = this.machine.tls.load_tls(key, tcx)?;
874 this.write_scalar(ptr, dest)?;
877 let key = this.read_scalar(args[0])?.to_u32()? as u128;
878 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
879 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
881 // Return success (`1`).
882 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
885 let which = this.read_scalar(args[0])?.to_i32()?;
886 // We just make this the identity function, so we know later in `WriteFile`
888 this.write_scalar(Scalar::from_int(which, this.pointer_size()), dest)?;
891 let handle = this.read_scalar(args[0])?.to_isize(this)?;
892 let buf = this.read_scalar(args[1])?.not_undef()?;
893 let n = this.read_scalar(args[2])?.to_u32()?;
894 let written_place = this.deref_operand(args[3])?;
895 // Spec says to always write `0` first.
896 this.write_null(written_place.into())?;
897 let written = if handle == -11 || handle == -12 {
899 use std::io::{self, Write};
901 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(u64::from(n)))?;
902 let res = if handle == -11 {
903 io::stdout().write(buf_cont)
905 io::stderr().write(buf_cont)
907 res.ok().map(|n| n as u32)
909 eprintln!("Miri: Ignored output to handle {}", handle);
910 // Pretend it all went well.
913 // If there was no error, write back how much was written.
914 if let Some(n) = written {
915 this.write_scalar(Scalar::from_u32(n), written_place.into())?;
917 // Return whether this was a success.
919 Scalar::from_int(if written.is_some() { 1 } else { 0 }, dest.layout.size),
923 "GetConsoleMode" => {
924 // Everything is a pipe.
925 this.write_null(dest)?;
927 "GetEnvironmentVariableW" => {
928 // This is not the env var you are looking for.
929 this.machine.last_error = 203; // ERROR_ENVVAR_NOT_FOUND
930 this.write_null(dest)?;
932 "GetCommandLineW" => {
933 this.write_scalar(Scalar::Ptr(this.machine.cmd_line.unwrap()), dest)?;
935 // The actual name of 'RtlGenRandom'
936 "SystemFunction036" => {
937 let ptr = this.read_scalar(args[0])?.not_undef()?;
938 let len = this.read_scalar(args[1])?.to_u32()?;
939 this.gen_random(ptr, len as usize)?;
940 this.write_scalar(Scalar::from_bool(true), dest)?;
943 // We can't execute anything else.
945 throw_unsup_format!("can't call foreign function: {}", link_name)
949 this.goto_block(Some(ret))?;
950 this.dump_place(*dest);
954 /// Evaluates the scalar at the specified path. Returns Some(val)
955 /// if the path could be resolved, and None otherwise
956 fn eval_path_scalar(&mut self, path: &[&str]) -> InterpResult<'tcx, Option<ScalarMaybeUndef<Tag>>> {
957 let this = self.eval_context_mut();
958 if let Ok(instance) = this.resolve_path(path) {
963 let const_val = this.const_eval_raw(cid)?;
964 let const_val = this.read_scalar(const_val.into())?;
965 return Ok(Some(const_val));
971 // Shims the linux 'getrandom()' syscall
972 fn linux_getrandom<'tcx>(
973 this: &mut MiriEvalContext<'_, 'tcx>,
974 args: &[OpTy<'tcx, Tag>],
975 dest: PlaceTy<'tcx, Tag>,
976 ) -> InterpResult<'tcx> {
977 let ptr = this.read_scalar(args[0])?.not_undef()?;
978 let len = this.read_scalar(args[1])?.to_usize(this)?;
980 // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
981 // neither of which have any effect on our current PRNG
982 let _flags = this.read_scalar(args[2])?.to_i32()?;
984 this.gen_random(ptr, len as usize)?;
985 this.write_scalar(Scalar::from_uint(len, dest.layout.size), dest)?;