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.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, None)?;
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)?;
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(&*this.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 eprintln!("Miri: Ignored output to FD {}", fd);
498 // Pretend it all went well.
501 // Now, `result` is the value we return back to the program.
503 Scalar::from_int(result, dest.layout.size),
509 let ptr = this.read_scalar(args[0])?.not_undef()?;
510 let n = this.memory().read_c_str(ptr)?.len();
511 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
516 "cbrtf" | "coshf" | "sinhf" |"tanf" => {
517 // FIXME: Using host floats.
518 let f = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
519 let f = match link_name {
526 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
528 // underscore case for windows
529 "_hypotf" | "hypotf" | "atan2f" => {
530 // FIXME: Using host floats.
531 let f1 = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
532 let f2 = f32::from_bits(this.read_scalar(args[1])?.to_u32()?);
533 let n = match link_name {
534 "_hypotf" | "hypotf" => f1.hypot(f2),
535 "atan2f" => f1.atan2(f2),
538 this.write_scalar(Scalar::from_u32(n.to_bits()), dest)?;
541 "cbrt" | "cosh" | "sinh" | "tan" => {
542 // FIXME: Using host floats.
543 let f = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
544 let f = match link_name {
551 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
553 // underscore case for windows, here and below
554 // (see https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/floating-point-primitives?view=vs-2019)
555 "_hypot" | "hypot" | "atan2" => {
556 // FIXME: Using host floats.
557 let f1 = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
558 let f2 = f64::from_bits(this.read_scalar(args[1])?.to_u64()?);
559 let n = match link_name {
560 "_hypot" | "hypot" => f1.hypot(f2),
561 "atan2" => f1.atan2(f2),
564 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
566 // For radix-2 (binary) systems, `ldexp` and `scalbn` are the same.
567 "_ldexp" | "ldexp" | "scalbn" => {
568 let x = this.read_scalar(args[0])?.to_f64()?;
569 let exp = this.read_scalar(args[1])?.to_i32()?;
571 // Saturating cast to i16. Even those are outside the valid exponent range to
572 // `scalbn` below will do its over/underflow handling.
573 let exp = if exp > i16::max_value() as i32 {
575 } else if exp < i16::min_value() as i32 {
578 exp.try_into().unwrap()
581 let res = x.scalbn(exp);
582 this.write_scalar(Scalar::from_f64(res), dest)?;
585 // Some things needed for `sys::thread` initialization to go through.
586 "signal" | "sigaction" | "sigaltstack" => {
587 this.write_scalar(Scalar::from_int(0, dest.layout.size), dest)?;
591 let name = this.read_scalar(args[0])?.to_i32()?;
593 trace!("sysconf() called with name {}", name);
594 // TODO: Cache the sysconf integers via Miri's global cache.
596 (&["libc", "_SC_PAGESIZE"], Scalar::from_int(PAGE_SIZE, dest.layout.size)),
597 (&["libc", "_SC_GETPW_R_SIZE_MAX"], Scalar::from_int(-1, dest.layout.size)),
598 (&["libc", "_SC_NPROCESSORS_ONLN"], Scalar::from_int(NUM_CPUS, dest.layout.size)),
600 let mut result = None;
601 for &(path, path_value) in paths {
602 if let Some(val) = this.eval_path_scalar(path)? {
603 let val = val.to_i32()?;
605 result = Some(path_value);
611 if let Some(result) = result {
612 this.write_scalar(result, dest)?;
614 throw_unsup_format!("Unimplemented sysconf name: {}", name)
618 "sched_getaffinity" => {
619 // Return an error; `num_cpus` then falls back to `sysconf`.
620 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
624 this.write_null(dest)?;
627 // Hook pthread calls that go to the thread-local storage memory subsystem.
628 "pthread_key_create" => {
629 let key_ptr = this.read_scalar(args[0])?.not_undef()?;
631 // Extract the function type out of the signature (that seems easier than constructing it ourselves).
632 let dtor = match this.test_null(this.read_scalar(args[1])?.not_undef()?)? {
633 Some(dtor_ptr) => Some(this.memory().get_fn(dtor_ptr)?.as_instance()?),
637 // Figure out how large a pthread TLS key actually is.
638 // This is `libc::pthread_key_t`.
639 let key_type = args[0].layout.ty
641 .ok_or_else(|| err_ub_format!(
642 "wrong signature used for `pthread_key_create`: first argument must be a raw pointer."
645 let key_layout = this.layout_of(key_type)?;
647 // Create key and write it into the memory where `key_ptr` wants it.
648 let key = this.machine.tls.create_tls_key(dtor) as u128;
649 if key_layout.size.bits() < 128 && key >= (1u128 << key_layout.size.bits() as u128) {
650 throw_unsup!(OutOfTls);
653 let key_ptr = this.memory().check_ptr_access(key_ptr, key_layout.size, key_layout.align.abi)?
654 .expect("cannot be a ZST");
655 this.memory_mut().get_mut(key_ptr.alloc_id)?.write_scalar(
658 Scalar::from_uint(key, key_layout.size).into(),
662 // Return success (`0`).
663 this.write_null(dest)?;
665 "pthread_key_delete" => {
666 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
667 this.machine.tls.delete_tls_key(key)?;
668 // Return success (0)
669 this.write_null(dest)?;
671 "pthread_getspecific" => {
672 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
673 let ptr = this.machine.tls.load_tls(key, tcx)?;
674 this.write_scalar(ptr, dest)?;
676 "pthread_setspecific" => {
677 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
678 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
679 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
681 // Return success (`0`).
682 this.write_null(dest)?;
685 // Stack size/address stuff.
686 "pthread_attr_init" | "pthread_attr_destroy" | "pthread_self" |
687 "pthread_attr_setstacksize" => {
688 this.write_null(dest)?;
690 "pthread_attr_getstack" => {
691 let addr_place = this.deref_operand(args[1])?;
692 let size_place = this.deref_operand(args[2])?;
695 Scalar::from_uint(STACK_ADDR, addr_place.layout.size),
699 Scalar::from_uint(STACK_SIZE, size_place.layout.size),
703 // Return success (`0`).
704 this.write_null(dest)?;
707 // We don't support threading. (Also for Windows.)
708 "pthread_create" | "CreateThread" => {
709 throw_unsup_format!("Miri does not support threading");
712 // Stub out calls for condvar, mutex and rwlock, to just return `0`.
713 "pthread_mutexattr_init" | "pthread_mutexattr_settype" | "pthread_mutex_init" |
714 "pthread_mutexattr_destroy" | "pthread_mutex_lock" | "pthread_mutex_unlock" |
715 "pthread_mutex_destroy" | "pthread_rwlock_rdlock" | "pthread_rwlock_unlock" |
716 "pthread_rwlock_wrlock" | "pthread_rwlock_destroy" | "pthread_condattr_init" |
717 "pthread_condattr_setclock" | "pthread_cond_init" | "pthread_condattr_destroy" |
718 "pthread_cond_destroy" => {
719 this.write_null(dest)?;
722 // We don't support fork so we don't have to do anything for atfork.
723 "pthread_atfork" => {
724 this.write_null(dest)?;
728 // 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.
729 let addr = this.read_scalar(args[0])?.not_undef()?;
730 this.write_scalar(addr, dest)?;
733 this.write_null(dest)?;
737 "pthread_attr_get_np" | "pthread_getattr_np" => {
738 this.write_null(dest)?;
740 "pthread_get_stackaddr_np" => {
741 let stack_addr = Scalar::from_uint(STACK_ADDR, dest.layout.size);
742 this.write_scalar(stack_addr, dest)?;
744 "pthread_get_stacksize_np" => {
745 let stack_size = Scalar::from_uint(STACK_SIZE, dest.layout.size);
746 this.write_scalar(stack_size, dest)?;
749 // FIXME: register the destructor.
752 this.write_scalar(Scalar::Ptr(this.machine.argc.unwrap()), dest)?;
755 this.write_scalar(Scalar::Ptr(this.machine.argv.unwrap()), dest)?;
757 "SecRandomCopyBytes" => {
758 let len = this.read_scalar(args[1])?.to_usize(this)?;
759 let ptr = this.read_scalar(args[2])?.not_undef()?;
760 this.gen_random(ptr, len as usize)?;
761 this.write_null(dest)?;
764 // Windows API stubs.
766 // DWORD = ULONG = u32
768 "GetProcessHeap" => {
769 // Just fake a HANDLE
770 this.write_scalar(Scalar::from_int(1, this.pointer_size()), dest)?;
773 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
774 let flags = this.read_scalar(args[1])?.to_u32()?;
775 let size = this.read_scalar(args[2])?.to_usize(this)?;
776 let zero_init = (flags & 0x00000008) != 0; // HEAP_ZERO_MEMORY
777 let res = this.malloc(size, zero_init, MiriMemoryKind::WinHeap);
778 this.write_scalar(res, dest)?;
781 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
782 let _flags = this.read_scalar(args[1])?.to_u32()?;
783 let ptr = this.read_scalar(args[2])?.not_undef()?;
784 this.free(ptr, MiriMemoryKind::WinHeap)?;
785 this.write_scalar(Scalar::from_int(1, Size::from_bytes(4)), dest)?;
788 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
789 let _flags = this.read_scalar(args[1])?.to_u32()?;
790 let ptr = this.read_scalar(args[2])?.not_undef()?;
791 let size = this.read_scalar(args[3])?.to_usize(this)?;
792 let res = this.realloc(ptr, size, MiriMemoryKind::WinHeap)?;
793 this.write_scalar(res, dest)?;
797 let err = this.read_scalar(args[0])?.to_u32()?;
798 this.machine.last_error = err;
801 this.write_scalar(Scalar::from_u32(this.machine.last_error), dest)?;
804 "AddVectoredExceptionHandler" => {
805 // Any non zero value works for the stdlib. This is just used for stack overflows anyway.
806 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
808 "InitializeCriticalSection" |
809 "EnterCriticalSection" |
810 "LeaveCriticalSection" |
811 "DeleteCriticalSection" => {
812 // Nothing to do, not even a return value.
816 "TryEnterCriticalSection" |
817 "GetConsoleScreenBufferInfo" |
818 "SetConsoleTextAttribute" => {
819 // Pretend these do not exist / nothing happened, by returning zero.
820 this.write_null(dest)?;
823 let system_info = this.deref_operand(args[0])?;
824 let system_info_ptr = this.check_mplace_access(system_info, None)?
825 .expect("cannot be a ZST");
826 // Initialize with `0`.
827 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
828 .write_repeat(tcx, system_info_ptr, 0, system_info.layout.size)?;
829 // Set number of processors.
830 let dword_size = Size::from_bytes(4);
831 let offset = 2*dword_size + 3*tcx.pointer_size();
832 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
835 system_info_ptr.offset(offset, tcx)?,
836 Scalar::from_int(NUM_CPUS, dword_size).into(),
842 // This just creates a key; Windows does not natively support TLS destructors.
844 // Create key and return it.
845 let key = this.machine.tls.create_tls_key(None) as u128;
847 // Figure out how large a TLS key actually is. This is `c::DWORD`.
848 if dest.layout.size.bits() < 128
849 && key >= (1u128 << dest.layout.size.bits() as u128) {
850 throw_unsup!(OutOfTls);
852 this.write_scalar(Scalar::from_uint(key, dest.layout.size), dest)?;
855 let key = this.read_scalar(args[0])?.to_u32()? as u128;
856 let ptr = this.machine.tls.load_tls(key, tcx)?;
857 this.write_scalar(ptr, dest)?;
860 let key = this.read_scalar(args[0])?.to_u32()? as u128;
861 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
862 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
864 // Return success (`1`).
865 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
868 let which = this.read_scalar(args[0])?.to_i32()?;
869 // We just make this the identity function, so we know later in `WriteFile`
871 this.write_scalar(Scalar::from_int(which, this.pointer_size()), dest)?;
874 let handle = this.read_scalar(args[0])?.to_isize(this)?;
875 let buf = this.read_scalar(args[1])?.not_undef()?;
876 let n = this.read_scalar(args[2])?.to_u32()?;
877 let written_place = this.deref_operand(args[3])?;
878 // Spec says to always write `0` first.
879 this.write_null(written_place.into())?;
880 let written = if handle == -11 || handle == -12 {
882 use std::io::{self, Write};
884 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(u64::from(n)))?;
885 let res = if handle == -11 {
886 io::stdout().write(buf_cont)
888 io::stderr().write(buf_cont)
890 res.ok().map(|n| n as u32)
892 eprintln!("Miri: Ignored output to handle {}", handle);
893 // Pretend it all went well.
896 // If there was no error, write back how much was written.
897 if let Some(n) = written {
898 this.write_scalar(Scalar::from_u32(n), written_place.into())?;
900 // Return whether this was a success.
902 Scalar::from_int(if written.is_some() { 1 } else { 0 }, dest.layout.size),
906 "GetConsoleMode" => {
907 // Everything is a pipe.
908 this.write_null(dest)?;
910 "GetEnvironmentVariableW" => {
911 // This is not the env var you are looking for.
912 this.machine.last_error = 203; // ERROR_ENVVAR_NOT_FOUND
913 this.write_null(dest)?;
915 "GetCommandLineW" => {
916 this.write_scalar(Scalar::Ptr(this.machine.cmd_line.unwrap()), dest)?;
918 // The actual name of 'RtlGenRandom'
919 "SystemFunction036" => {
920 let ptr = this.read_scalar(args[0])?.not_undef()?;
921 let len = this.read_scalar(args[1])?.to_u32()?;
922 this.gen_random(ptr, len as usize)?;
923 this.write_scalar(Scalar::from_bool(true), dest)?;
926 // We can't execute anything else.
928 throw_unsup_format!("can't call foreign function: {}", link_name)
932 this.goto_block(Some(ret))?;
933 this.dump_place(*dest);
937 /// Evaluates the scalar at the specified path. Returns Some(val)
938 /// if the path could be resolved, and None otherwise
939 fn eval_path_scalar(&mut self, path: &[&str]) -> InterpResult<'tcx, Option<ScalarMaybeUndef<Tag>>> {
940 let this = self.eval_context_mut();
941 if let Ok(instance) = this.resolve_path(path) {
946 let const_val = this.const_eval_raw(cid)?;
947 let const_val = this.read_scalar(const_val.into())?;
948 return Ok(Some(const_val));
953 fn eval_libc_i32(&mut self, name: &str) -> InterpResult<'tcx, i32> {
956 .eval_path_scalar(&["libc", name])?
957 .ok_or_else(|| err_unsup_format!("Path libc::{} cannot be resolved.", name).into())
958 .and_then(|scalar| scalar.to_i32())
962 // Shims the linux 'getrandom()' syscall.
963 fn linux_getrandom<'tcx>(
964 this: &mut MiriEvalContext<'_, 'tcx>,
965 args: &[OpTy<'tcx, Tag>],
966 dest: PlaceTy<'tcx, Tag>,
967 ) -> InterpResult<'tcx> {
968 let ptr = this.read_scalar(args[0])?.not_undef()?;
969 let len = this.read_scalar(args[1])?.to_usize(this)?;
971 // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
972 // neither of which have any effect on our current PRNG.
973 let _flags = this.read_scalar(args[2])?.to_i32()?;
975 this.gen_random(ptr, len as usize)?;
976 this.write_scalar(Scalar::from_uint(len, dest.layout.size), dest)?;