1 use std::convert::TryInto;
3 use rustc::hir::def_id::DefId;
5 use rustc::ty::layout::{Align, LayoutOf, Size};
6 use rustc_apfloat::Float;
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()
43 fn malloc(&mut self, size: u64, zero_init: bool, kind: MiriMemoryKind) -> Scalar<Tag> {
44 let this = self.eval_context_mut();
46 Scalar::from_int(0, this.pointer_size())
48 let align = this.min_align(size, kind);
51 .allocate(Size::from_bytes(size), align, kind.into());
53 // We just allocated this, the access is definitely in-bounds.
55 .get_mut(ptr.alloc_id)
57 .write_repeat(&*this.tcx, ptr, 0, Size::from_bytes(size))
64 fn free(&mut self, ptr: Scalar<Tag>, kind: MiriMemoryKind) -> InterpResult<'tcx> {
65 let this = self.eval_context_mut();
66 if !this.is_null(ptr)? {
67 let ptr = this.force_ptr(ptr)?;
68 this.memory.deallocate(ptr, None, kind.into())?;
78 ) -> InterpResult<'tcx, Scalar<Tag>> {
79 let this = self.eval_context_mut();
80 let new_align = this.min_align(new_size, kind);
81 if this.is_null(old_ptr)? {
83 Ok(Scalar::from_int(0, this.pointer_size()))
87 .allocate(Size::from_bytes(new_size), new_align, kind.into());
88 Ok(Scalar::Ptr(new_ptr))
91 let old_ptr = this.force_ptr(old_ptr)?;
93 this.memory.deallocate(old_ptr, None, kind.into())?;
94 Ok(Scalar::from_int(0, this.pointer_size()))
96 let new_ptr = this.memory.reallocate(
99 Size::from_bytes(new_size),
103 Ok(Scalar::Ptr(new_ptr))
108 /// Emulates calling a foreign item, failing if the item is not supported.
109 /// This function will handle `goto_block` if needed.
110 fn emulate_foreign_item(
113 args: &[OpTy<'tcx, Tag>],
114 dest: Option<PlaceTy<'tcx, Tag>>,
115 ret: Option<mir::BasicBlock>,
116 ) -> InterpResult<'tcx> {
117 let this = self.eval_context_mut();
118 let attrs = this.tcx.get_attrs(def_id);
119 let link_name = match attr::first_attr_value_str_by_name(&attrs, sym::link_name) {
120 Some(name) => name.as_str(),
121 None => this.tcx.item_name(def_id).as_str(),
123 // Strip linker suffixes (seen on 32-bit macOS).
124 let link_name = link_name.trim_end_matches("$UNIX2003");
125 let tcx = &{ this.tcx.tcx };
127 // First: functions that diverge.
129 "__rust_start_panic" | "panic_impl" => {
130 throw_unsup_format!("the evaluated program panicked");
132 "exit" | "ExitProcess" => {
133 // it's really u32 for ExitProcess, but we have to put it into the `Exit` error variant anyway
134 let code = this.read_scalar(args[0])?.to_i32()?;
135 return Err(InterpError::Exit(code).into());
139 throw_unsup_format!("can't call (diverging) foreign function: {}", link_name);
144 // Next: functions that assume a ret and dest.
145 let dest = dest.expect("we already checked for a dest");
146 let ret = ret.expect("dest is `Some` but ret is `None`");
149 let size = this.read_scalar(args[0])?.to_usize(this)?;
150 let res = this.malloc(size, /*zero_init:*/ false, MiriMemoryKind::C);
151 this.write_scalar(res, dest)?;
154 let items = this.read_scalar(args[0])?.to_usize(this)?;
155 let len = this.read_scalar(args[1])?.to_usize(this)?;
158 .ok_or_else(|| err_panic!(Overflow(mir::BinOp::Mul)))?;
159 let res = this.malloc(size, /*zero_init:*/ true, MiriMemoryKind::C);
160 this.write_scalar(res, dest)?;
162 "posix_memalign" => {
163 let ret = this.deref_operand(args[0])?;
164 let align = this.read_scalar(args[1])?.to_usize(this)?;
165 let size = this.read_scalar(args[2])?.to_usize(this)?;
166 // Align must be power of 2, and also at least ptr-sized (POSIX rules).
167 if !align.is_power_of_two() {
168 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
170 if align < this.pointer_size().bytes() {
172 "posix_memalign: alignment must be at least the size of a pointer, but is {}",
178 this.write_null(ret.into())?;
180 let ptr = this.memory.allocate(
181 Size::from_bytes(size),
182 Align::from_bytes(align).unwrap(),
183 MiriMemoryKind::C.into(),
185 this.write_scalar(Scalar::Ptr(ptr), ret.into())?;
187 this.write_null(dest)?;
190 let ptr = this.read_scalar(args[0])?.not_undef()?;
191 this.free(ptr, MiriMemoryKind::C)?;
194 let old_ptr = this.read_scalar(args[0])?.not_undef()?;
195 let new_size = this.read_scalar(args[1])?.to_usize(this)?;
196 let res = this.realloc(old_ptr, new_size, MiriMemoryKind::C)?;
197 this.write_scalar(res, dest)?;
201 let size = this.read_scalar(args[0])?.to_usize(this)?;
202 let align = this.read_scalar(args[1])?.to_usize(this)?;
204 throw_unsup!(HeapAllocZeroBytes);
206 if !align.is_power_of_two() {
207 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
209 let ptr = this.memory.allocate(
210 Size::from_bytes(size),
211 Align::from_bytes(align).unwrap(),
212 MiriMemoryKind::Rust.into(),
214 this.write_scalar(Scalar::Ptr(ptr), dest)?;
216 "__rust_alloc_zeroed" => {
217 let size = this.read_scalar(args[0])?.to_usize(this)?;
218 let align = this.read_scalar(args[1])?.to_usize(this)?;
220 throw_unsup!(HeapAllocZeroBytes);
222 if !align.is_power_of_two() {
223 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
225 let ptr = this.memory.allocate(
226 Size::from_bytes(size),
227 Align::from_bytes(align).unwrap(),
228 MiriMemoryKind::Rust.into(),
230 // We just allocated this, the access is definitely in-bounds.
232 .get_mut(ptr.alloc_id)
234 .write_repeat(tcx, ptr, 0, Size::from_bytes(size))
236 this.write_scalar(Scalar::Ptr(ptr), dest)?;
238 "__rust_dealloc" => {
239 let ptr = this.read_scalar(args[0])?.not_undef()?;
240 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
241 let align = this.read_scalar(args[2])?.to_usize(this)?;
243 throw_unsup!(HeapAllocZeroBytes);
245 if !align.is_power_of_two() {
246 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
248 let ptr = this.force_ptr(ptr)?;
249 this.memory.deallocate(
252 Size::from_bytes(old_size),
253 Align::from_bytes(align).unwrap(),
255 MiriMemoryKind::Rust.into(),
258 "__rust_realloc" => {
259 let ptr = this.read_scalar(args[0])?.to_ptr()?;
260 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
261 let align = this.read_scalar(args[2])?.to_usize(this)?;
262 let new_size = this.read_scalar(args[3])?.to_usize(this)?;
263 if old_size == 0 || new_size == 0 {
264 throw_unsup!(HeapAllocZeroBytes);
266 if !align.is_power_of_two() {
267 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
269 let align = Align::from_bytes(align).unwrap();
270 let new_ptr = this.memory.reallocate(
272 Some((Size::from_bytes(old_size), align)),
273 Size::from_bytes(new_size),
275 MiriMemoryKind::Rust.into(),
277 this.write_scalar(Scalar::Ptr(new_ptr), dest)?;
281 let sys_getrandom = this
282 .eval_path_scalar(&["libc", "SYS_getrandom"])?
283 .expect("Failed to get libc::SYS_getrandom")
286 // `libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)`
287 // is called if a `HashMap` is created the regular way (e.g. HashMap<K, V>).
288 match this.read_scalar(args[0])?.to_usize(this)? {
289 id if id == sys_getrandom => {
290 // The first argument is the syscall id,
292 linux_getrandom(this, &args[1..], dest)?;
294 id => throw_unsup_format!("miri does not support syscall ID {}", id),
299 linux_getrandom(this, args, dest)?;
303 let _handle = this.read_scalar(args[0])?;
304 let symbol = this.read_scalar(args[1])?.not_undef()?;
305 let symbol_name = this.memory.read_c_str(symbol)?;
306 let err = format!("bad c unicode symbol: {:?}", symbol_name);
307 let symbol_name = ::std::str::from_utf8(symbol_name).unwrap_or(&err);
308 if let Some(dlsym) = Dlsym::from_str(symbol_name)? {
309 let ptr = this.memory.create_fn_alloc(FnVal::Other(dlsym));
310 this.write_scalar(Scalar::from(ptr), dest)?;
312 this.write_null(dest)?;
316 "__rust_maybe_catch_panic" => {
317 // fn __rust_maybe_catch_panic(
320 // data_ptr: *mut usize,
321 // vtable_ptr: *mut usize,
323 // We abort on panic, so not much is going on here, but we still have to call the closure.
324 let f = this.read_scalar(args[0])?.not_undef()?;
325 let data = this.read_scalar(args[1])?.not_undef()?;
326 let f_instance = this.memory.get_fn(f)?.as_instance()?;
327 this.write_null(dest)?;
328 trace!("__rust_maybe_catch_panic: {:?}", f_instance);
330 // Now we make a function call.
331 // TODO: consider making this reusable? `InterpCx::step` does something similar
332 // for the TLS destructors, and of course `eval_main`.
333 let mir = this.load_mir(f_instance.def, None)?;
335 MPlaceTy::dangling(this.layout_of(tcx.mk_unit())?, this).into();
336 this.push_stack_frame(
341 // Directly return to caller.
342 StackPopCleanup::Goto(Some(ret)),
344 let mut args = this.frame().body.args_iter();
348 .expect("Argument to __rust_maybe_catch_panic does not take enough arguments.");
349 let arg_dest = this.local_place(arg_local)?;
350 this.write_scalar(data, arg_dest)?;
353 args.next().is_none(),
354 "__rust_maybe_catch_panic argument has more arguments than expected"
357 // We ourselves will return `0`, eventually (because we will not return if we paniced).
358 this.write_null(dest)?;
360 // Don't fall through, we do *not* want to `goto_block`!
365 let left = this.read_scalar(args[0])?.not_undef()?;
366 let right = this.read_scalar(args[1])?.not_undef()?;
367 let n = Size::from_bytes(this.read_scalar(args[2])?.to_usize(this)?);
370 let left_bytes = this.memory.read_bytes(left, n)?;
371 let right_bytes = this.memory.read_bytes(right, n)?;
373 use std::cmp::Ordering::*;
374 match left_bytes.cmp(right_bytes) {
381 this.write_scalar(Scalar::from_int(result, Size::from_bits(32)), dest)?;
385 let ptr = this.read_scalar(args[0])?.not_undef()?;
386 let val = this.read_scalar(args[1])?.to_i32()? as u8;
387 let num = this.read_scalar(args[2])?.to_usize(this)?;
388 if let Some(idx) = this
390 .read_bytes(ptr, Size::from_bytes(num))?
393 .position(|&c| c == val)
395 let new_ptr = ptr.ptr_offset(Size::from_bytes(num - idx as u64 - 1), this)?;
396 this.write_scalar(new_ptr, dest)?;
398 this.write_null(dest)?;
403 let ptr = this.read_scalar(args[0])?.not_undef()?;
404 let val = this.read_scalar(args[1])?.to_i32()? as u8;
405 let num = this.read_scalar(args[2])?.to_usize(this)?;
408 .read_bytes(ptr, Size::from_bytes(num))?
410 .position(|&c| c == val);
411 if let Some(idx) = idx {
412 let new_ptr = ptr.ptr_offset(Size::from_bytes(idx as u64), this)?;
413 this.write_scalar(new_ptr, dest)?;
415 this.write_null(dest)?;
419 "__errno_location" | "__error" => {
420 let errno_scalar: Scalar<Tag> = this.machine.last_error.unwrap().into();
421 this.write_scalar(errno_scalar, dest)?;
425 let result = this.getenv(args[0])?;
426 this.write_scalar(result, dest)?;
430 let result = this.unsetenv(args[0])?;
431 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
435 let result = this.setenv(args[0], args[1])?;
436 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
440 let result = this.getcwd(args[0], args[1])?;
441 this.write_scalar(result, dest)?;
445 let result = this.chdir(args[0])?;
446 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
449 "open" | "open64" => {
450 let result = this.open(args[0], args[1])?;
451 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
455 let result = this.fcntl(args[0], args[1], args.get(2).cloned())?;
456 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
459 "close" | "close$NOCANCEL" => {
460 let result = this.close(args[0])?;
461 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
465 let result = this.read(args[0], args[1], args[2])?;
466 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
470 let fd = this.read_scalar(args[0])?.to_i32()?;
471 let buf = this.read_scalar(args[1])?.not_undef()?;
472 let n = this.read_scalar(args[2])?.to_usize(tcx)?;
473 trace!("Called write({:?}, {:?}, {:?})", fd, buf, n);
474 let result = if fd == 1 || fd == 2 {
476 use std::io::{self, Write};
478 let buf_cont = this.memory.read_bytes(buf, Size::from_bytes(n))?;
479 // We need to flush to make sure this actually appears on the screen
480 let res = if fd == 1 {
481 // Stdout is buffered, flush to make sure it appears on the screen.
482 // This is the write() syscall of the interpreted program, we want it
483 // to correspond to a write() syscall on the host -- there is no good
484 // in adding extra buffering here.
485 let res = io::stdout().write(buf_cont);
486 io::stdout().flush().unwrap();
489 // No need to flush, stderr is not buffered.
490 io::stderr().write(buf_cont)
497 this.write(args[0], args[1], args[2])?
499 // Now, `result` is the value we return back to the program.
500 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
504 let result = this.unlink(args[0])?;
505 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
509 let result = this.clock_gettime(args[0], args[1])?;
510 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
514 let result = this.gettimeofday(args[0], args[1])?;
515 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
519 let ptr = this.read_scalar(args[0])?.not_undef()?;
520 let n = this.memory.read_c_str(ptr)?.len();
521 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
525 "cbrtf" | "coshf" | "sinhf" | "tanf" => {
526 // FIXME: Using host floats.
527 let f = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
528 let f = match link_name {
535 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
537 // underscore case for windows
538 "_hypotf" | "hypotf" | "atan2f" => {
539 // FIXME: Using host floats.
540 let f1 = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
541 let f2 = f32::from_bits(this.read_scalar(args[1])?.to_u32()?);
542 let n = match link_name {
543 "_hypotf" | "hypotf" => f1.hypot(f2),
544 "atan2f" => f1.atan2(f2),
547 this.write_scalar(Scalar::from_u32(n.to_bits()), dest)?;
550 "cbrt" | "cosh" | "sinh" | "tan" => {
551 // FIXME: Using host floats.
552 let f = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
553 let f = match link_name {
560 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
562 // underscore case for windows, here and below
563 // (see https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/floating-point-primitives?view=vs-2019)
564 "_hypot" | "hypot" | "atan2" => {
565 // FIXME: Using host floats.
566 let f1 = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
567 let f2 = f64::from_bits(this.read_scalar(args[1])?.to_u64()?);
568 let n = match link_name {
569 "_hypot" | "hypot" => f1.hypot(f2),
570 "atan2" => f1.atan2(f2),
573 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
575 // For radix-2 (binary) systems, `ldexp` and `scalbn` are the same.
576 "_ldexp" | "ldexp" | "scalbn" => {
577 let x = this.read_scalar(args[0])?.to_f64()?;
578 let exp = this.read_scalar(args[1])?.to_i32()?;
580 // Saturating cast to i16. Even those are outside the valid exponent range to
581 // `scalbn` below will do its over/underflow handling.
582 let exp = if exp > i16::max_value() as i32 {
584 } else if exp < i16::min_value() as i32 {
587 exp.try_into().unwrap()
590 let res = x.scalbn(exp);
591 this.write_scalar(Scalar::from_f64(res), dest)?;
594 // Some things needed for `sys::thread` initialization to go through.
595 "signal" | "sigaction" | "sigaltstack" => {
596 this.write_scalar(Scalar::from_int(0, dest.layout.size), dest)?;
600 let name = this.read_scalar(args[0])?.to_i32()?;
602 trace!("sysconf() called with name {}", name);
603 // TODO: Cache the sysconf integers via Miri's global cache.
606 &["libc", "_SC_PAGESIZE"],
607 Scalar::from_int(PAGE_SIZE, dest.layout.size),
610 &["libc", "_SC_GETPW_R_SIZE_MAX"],
611 Scalar::from_int(-1, dest.layout.size),
614 &["libc", "_SC_NPROCESSORS_ONLN"],
615 Scalar::from_int(NUM_CPUS, dest.layout.size),
618 let mut result = None;
619 for &(path, path_value) in paths {
620 if let Some(val) = this.eval_path_scalar(path)? {
621 let val = val.to_i32()?;
623 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_place = this.deref_operand(args[0])?;
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_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)
668 throw_unsup!(OutOfTls);
671 this.write_scalar(Scalar::from_uint(key, key_layout.size), key_place.into())?;
673 // Return success (`0`).
674 this.write_null(dest)?;
676 "pthread_key_delete" => {
677 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
678 this.machine.tls.delete_tls_key(key)?;
679 // Return success (0)
680 this.write_null(dest)?;
682 "pthread_getspecific" => {
683 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
684 let ptr = this.machine.tls.load_tls(key, tcx)?;
685 this.write_scalar(ptr, dest)?;
687 "pthread_setspecific" => {
688 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
689 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
690 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
692 // Return success (`0`).
693 this.write_null(dest)?;
696 // Stack size/address stuff.
698 | "pthread_attr_destroy"
700 | "pthread_attr_setstacksize" => {
701 this.write_null(dest)?;
703 "pthread_attr_getstack" => {
704 let addr_place = this.deref_operand(args[1])?;
705 let size_place = this.deref_operand(args[2])?;
708 Scalar::from_uint(STACK_ADDR, addr_place.layout.size),
712 Scalar::from_uint(STACK_SIZE, size_place.layout.size),
716 // Return success (`0`).
717 this.write_null(dest)?;
720 // We don't support threading. (Also for Windows.)
721 "pthread_create" | "CreateThread" => {
722 throw_unsup_format!("Miri does not support threading");
725 // Stub out calls for condvar, mutex and rwlock, to just return `0`.
726 "pthread_mutexattr_init"
727 | "pthread_mutexattr_settype"
728 | "pthread_mutex_init"
729 | "pthread_mutexattr_destroy"
730 | "pthread_mutex_lock"
731 | "pthread_mutex_unlock"
732 | "pthread_mutex_destroy"
733 | "pthread_rwlock_rdlock"
734 | "pthread_rwlock_unlock"
735 | "pthread_rwlock_wrlock"
736 | "pthread_rwlock_destroy"
737 | "pthread_condattr_init"
738 | "pthread_condattr_setclock"
739 | "pthread_cond_init"
740 | "pthread_condattr_destroy"
741 | "pthread_cond_destroy" => {
742 this.write_null(dest)?;
745 // We don't support fork so we don't have to do anything for atfork.
746 "pthread_atfork" => {
747 this.write_null(dest)?;
751 // 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.
752 let addr = this.read_scalar(args[0])?.not_undef()?;
753 this.write_scalar(addr, dest)?;
756 this.write_null(dest)?;
760 "pthread_attr_get_np" | "pthread_getattr_np" => {
761 this.write_null(dest)?;
763 "pthread_get_stackaddr_np" => {
764 let stack_addr = Scalar::from_uint(STACK_ADDR, dest.layout.size);
765 this.write_scalar(stack_addr, dest)?;
767 "pthread_get_stacksize_np" => {
768 let stack_size = Scalar::from_uint(STACK_SIZE, dest.layout.size);
769 this.write_scalar(stack_size, dest)?;
772 // FIXME: register the destructor.
775 this.write_scalar(Scalar::Ptr(this.machine.argc.unwrap()), dest)?;
778 this.write_scalar(Scalar::Ptr(this.machine.argv.unwrap()), dest)?;
780 "SecRandomCopyBytes" => {
781 let len = this.read_scalar(args[1])?.to_usize(this)?;
782 let ptr = this.read_scalar(args[2])?.not_undef()?;
783 this.gen_random(ptr, len as usize)?;
784 this.write_null(dest)?;
787 // Windows API stubs.
789 // DWORD = ULONG = u32
791 "GetProcessHeap" => {
792 // Just fake a HANDLE
793 this.write_scalar(Scalar::from_int(1, this.pointer_size()), dest)?;
796 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
797 let flags = this.read_scalar(args[1])?.to_u32()?;
798 let size = this.read_scalar(args[2])?.to_usize(this)?;
799 let zero_init = (flags & 0x00000008) != 0; // HEAP_ZERO_MEMORY
800 let res = this.malloc(size, zero_init, MiriMemoryKind::WinHeap);
801 this.write_scalar(res, dest)?;
804 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
805 let _flags = this.read_scalar(args[1])?.to_u32()?;
806 let ptr = this.read_scalar(args[2])?.not_undef()?;
807 this.free(ptr, MiriMemoryKind::WinHeap)?;
808 this.write_scalar(Scalar::from_int(1, Size::from_bytes(4)), dest)?;
811 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
812 let _flags = this.read_scalar(args[1])?.to_u32()?;
813 let ptr = this.read_scalar(args[2])?.not_undef()?;
814 let size = this.read_scalar(args[3])?.to_usize(this)?;
815 let res = this.realloc(ptr, size, MiriMemoryKind::WinHeap)?;
816 this.write_scalar(res, dest)?;
820 this.set_last_error(this.read_scalar(args[0])?.not_undef()?)?;
823 let last_error = this.get_last_error()?;
824 this.write_scalar(last_error, dest)?;
827 "AddVectoredExceptionHandler" => {
828 // Any non zero value works for the stdlib. This is just used for stack overflows anyway.
829 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
831 "InitializeCriticalSection"
832 | "EnterCriticalSection"
833 | "LeaveCriticalSection"
834 | "DeleteCriticalSection" => {
835 // Nothing to do, not even a return value.
839 | "TryEnterCriticalSection"
840 | "GetConsoleScreenBufferInfo"
841 | "SetConsoleTextAttribute" => {
842 // Pretend these do not exist / nothing happened, by returning zero.
843 this.write_null(dest)?;
846 let system_info = this.deref_operand(args[0])?;
847 let system_info_ptr = this
848 .check_mplace_access(system_info, None)?
849 .expect("cannot be a ZST");
850 // We rely on `deref_operand` doing bounds checks for us.
851 // Initialize with `0`.
853 .get_mut(system_info_ptr.alloc_id)?
854 .write_repeat(tcx, system_info_ptr, 0, system_info.layout.size)?;
855 // Set number of processors.
856 let dword_size = Size::from_bytes(4);
857 let offset = 2 * dword_size + 3 * tcx.pointer_size();
859 .get_mut(system_info_ptr.alloc_id)?
862 system_info_ptr.offset(offset, tcx)?,
863 Scalar::from_int(NUM_CPUS, dword_size).into(),
869 // This just creates a key; Windows does not natively support TLS destructors.
871 // Create key and return it.
872 let key = this.machine.tls.create_tls_key(None) as u128;
874 // Figure out how large a TLS key actually is. This is `c::DWORD`.
875 if dest.layout.size.bits() < 128
876 && key >= (1u128 << dest.layout.size.bits() as u128)
878 throw_unsup!(OutOfTls);
880 this.write_scalar(Scalar::from_uint(key, dest.layout.size), dest)?;
883 let key = this.read_scalar(args[0])?.to_u32()? as u128;
884 let ptr = this.machine.tls.load_tls(key, tcx)?;
885 this.write_scalar(ptr, dest)?;
888 let key = this.read_scalar(args[0])?.to_u32()? as u128;
889 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
890 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
892 // Return success (`1`).
893 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
896 let which = this.read_scalar(args[0])?.to_i32()?;
897 // We just make this the identity function, so we know later in `WriteFile`
899 this.write_scalar(Scalar::from_int(which, this.pointer_size()), dest)?;
902 let handle = this.read_scalar(args[0])?.to_isize(this)?;
903 let buf = this.read_scalar(args[1])?.not_undef()?;
904 let n = this.read_scalar(args[2])?.to_u32()?;
905 let written_place = this.deref_operand(args[3])?;
906 // Spec says to always write `0` first.
907 this.write_null(written_place.into())?;
908 let written = if handle == -11 || handle == -12 {
910 use std::io::{self, Write};
914 .read_bytes(buf, Size::from_bytes(u64::from(n)))?;
915 let res = if handle == -11 {
916 io::stdout().write(buf_cont)
918 io::stderr().write(buf_cont)
920 res.ok().map(|n| n as u32)
922 eprintln!("Miri: Ignored output to handle {}", handle);
923 // Pretend it all went well.
926 // If there was no error, write back how much was written.
927 if let Some(n) = written {
928 this.write_scalar(Scalar::from_u32(n), written_place.into())?;
930 // Return whether this was a success.
932 Scalar::from_int(if written.is_some() { 1 } else { 0 }, dest.layout.size),
936 "GetConsoleMode" => {
937 // Everything is a pipe.
938 this.write_null(dest)?;
940 "GetEnvironmentVariableW" => {
941 // This is not the env var you are looking for.
942 this.set_last_error(Scalar::from_u32(203))?; // ERROR_ENVVAR_NOT_FOUND
943 this.write_null(dest)?;
945 "GetCommandLineW" => {
946 this.write_scalar(Scalar::Ptr(this.machine.cmd_line.unwrap()), dest)?;
948 // The actual name of 'RtlGenRandom'
949 "SystemFunction036" => {
950 let ptr = this.read_scalar(args[0])?.not_undef()?;
951 let len = this.read_scalar(args[1])?.to_u32()?;
952 this.gen_random(ptr, len as usize)?;
953 this.write_scalar(Scalar::from_bool(true), dest)?;
956 // We can't execute anything else.
957 _ => throw_unsup_format!("can't call foreign function: {}", link_name),
960 this.goto_block(Some(ret))?;
961 this.dump_place(*dest);
965 /// Evaluates the scalar at the specified path. Returns Some(val)
966 /// if the path could be resolved, and None otherwise
970 ) -> InterpResult<'tcx, Option<ScalarMaybeUndef<Tag>>> {
971 let this = self.eval_context_mut();
972 if let Ok(instance) = this.resolve_path(path) {
977 let const_val = this.const_eval_raw(cid)?;
978 let const_val = this.read_scalar(const_val.into())?;
979 return Ok(Some(const_val));
984 fn set_last_error(&mut self, scalar: Scalar<Tag>) -> InterpResult<'tcx> {
985 let this = self.eval_context_mut();
986 let errno_ptr = this.machine.last_error.unwrap();
987 // We allocated this during machine initialziation so the bounds are fine.
988 this.memory.get_mut(errno_ptr.alloc_id)?.write_scalar(
996 fn get_last_error(&mut self) -> InterpResult<'tcx, Scalar<Tag>> {
997 let this = self.eval_context_mut();
998 let errno_ptr = this.machine.last_error.unwrap();
1000 .get(errno_ptr.alloc_id)?
1001 .read_scalar(&*this.tcx, errno_ptr, Size::from_bits(32))?
1005 fn consume_io_error(&mut self, e: std::io::Error) -> InterpResult<'tcx> {
1006 self.eval_context_mut().set_last_error(Scalar::from_int(
1007 e.raw_os_error().unwrap(),
1008 Size::from_bits(32),
1013 // Shims the linux 'getrandom()' syscall.
1014 fn linux_getrandom<'tcx>(
1015 this: &mut MiriEvalContext<'_, 'tcx>,
1016 args: &[OpTy<'tcx, Tag>],
1017 dest: PlaceTy<'tcx, Tag>,
1018 ) -> InterpResult<'tcx> {
1019 let ptr = this.read_scalar(args[0])?.not_undef()?;
1020 let len = this.read_scalar(args[1])?.to_usize(this)?;
1022 // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
1023 // neither of which have any effect on our current PRNG.
1024 let _flags = this.read_scalar(args[2])?.to_i32()?;
1026 this.gen_random(ptr, len as usize)?;
1027 this.write_scalar(Scalar::from_uint(len, dest.layout.size), dest)?;