1 use rustc::ty::layout::{Align, LayoutOf, Size};
2 use rustc::hir::def_id::DefId;
5 use syntax::symbol::sym;
8 use crate::shims::env::alloc_env_value;
10 impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
11 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
12 /// Returns the minimum alignment for the target architecture for allocations of the given size.
13 fn min_align(&self, size: u64, kind: MiriMemoryKind) -> Align {
14 let this = self.eval_context_ref();
15 // List taken from `libstd/sys_common/alloc.rs`.
16 let min_align = match this.tcx.tcx.sess.target.target.arch.as_str() {
17 "x86" | "arm" | "mips" | "powerpc" | "powerpc64" | "asmjs" | "wasm32" => 8,
18 "x86_64" | "aarch64" | "mips64" | "s390x" | "sparc64" => 16,
19 arch => bug!("Unsupported target architecture: {}", arch),
21 // Windows always aligns, even small allocations.
22 // Source: <https://support.microsoft.com/en-us/help/286470/how-to-use-pageheap-exe-in-windows-xp-windows-2000-and-windows-server>
23 // But jemalloc does not, so for the C heap we only align if the allocation is sufficiently big.
24 if kind == MiriMemoryKind::WinHeap || size >= min_align {
25 return Align::from_bytes(min_align).unwrap();
27 // We have `size < min_align`. Round `size` *down* to the next power of two and use that.
28 fn prev_power_of_two(x: u64) -> u64 {
29 let next_pow2 = x.next_power_of_two();
31 // x *is* a power of two, just use that.
34 // x is between two powers, so next = 2*prev.
38 Align::from_bytes(prev_power_of_two(size)).unwrap()
47 let this = self.eval_context_mut();
48 let tcx = &{this.tcx.tcx};
50 Scalar::from_int(0, this.pointer_size())
52 let align = this.min_align(size, kind);
53 let ptr = this.memory_mut().allocate(Size::from_bytes(size), align, kind.into());
55 // We just allocated this, the access cannot fail
57 .get_mut(ptr.alloc_id).unwrap()
58 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
68 ) -> InterpResult<'tcx> {
69 let this = self.eval_context_mut();
70 if !this.is_null(ptr)? {
71 let ptr = this.force_ptr(ptr)?;
72 this.memory_mut().deallocate(
86 ) -> InterpResult<'tcx, Scalar<Tag>> {
87 let this = self.eval_context_mut();
88 let new_align = this.min_align(new_size, kind);
89 if this.is_null(old_ptr)? {
91 Ok(Scalar::from_int(0, this.pointer_size()))
93 let new_ptr = this.memory_mut().allocate(
94 Size::from_bytes(new_size),
98 Ok(Scalar::Ptr(new_ptr))
101 let old_ptr = this.force_ptr(old_ptr)?;
102 let memory = this.memory_mut();
109 Ok(Scalar::from_int(0, this.pointer_size()))
111 let new_ptr = memory.reallocate(
114 Size::from_bytes(new_size),
118 Ok(Scalar::Ptr(new_ptr))
123 /// Emulates calling a foreign item, failing if the item is not supported.
124 /// This function will handle `goto_block` if needed.
125 fn emulate_foreign_item(
128 args: &[OpTy<'tcx, Tag>],
129 dest: Option<PlaceTy<'tcx, Tag>>,
130 ret: Option<mir::BasicBlock>,
131 ) -> InterpResult<'tcx> {
132 let this = self.eval_context_mut();
133 let attrs = this.tcx.get_attrs(def_id);
134 let link_name = match attr::first_attr_value_str_by_name(&attrs, sym::link_name) {
135 Some(name) => name.as_str(),
136 None => this.tcx.item_name(def_id).as_str(),
138 // Strip linker suffixes (seen on 32-bit macOS).
139 let link_name = link_name.get().trim_end_matches("$UNIX2003");
140 let tcx = &{this.tcx.tcx};
142 // First: functions that diverge.
144 "__rust_start_panic" | "panic_impl" => {
145 throw_unsup_format!("the evaluated program panicked");
147 "exit" | "ExitProcess" => {
148 // it's really u32 for ExitProcess, but we have to put it into the `Exit` error variant anyway
149 let code = this.read_scalar(args[0])?.to_i32()?;
150 return Err(InterpError::Exit(code).into());
152 _ => if dest.is_none() {
153 throw_unsup_format!("can't call (diverging) foreign function: {}", link_name);
157 // Next: functions that assume a ret and dest.
158 let dest = dest.expect("we already checked for a dest");
159 let ret = ret.expect("dest is `Some` but ret is `None`");
162 let size = this.read_scalar(args[0])?.to_usize(this)?;
163 let res = this.malloc(size, /*zero_init:*/ false, MiriMemoryKind::C);
164 this.write_scalar(res, dest)?;
167 let items = this.read_scalar(args[0])?.to_usize(this)?;
168 let len = this.read_scalar(args[1])?.to_usize(this)?;
169 let size = items.checked_mul(len).ok_or_else(|| err_panic!(Overflow(mir::BinOp::Mul)))?;
170 let res = this.malloc(size, /*zero_init:*/ true, MiriMemoryKind::C);
171 this.write_scalar(res, dest)?;
173 "posix_memalign" => {
174 let ret = this.deref_operand(args[0])?;
175 let align = this.read_scalar(args[1])?.to_usize(this)?;
176 let size = this.read_scalar(args[2])?.to_usize(this)?;
177 // Align must be power of 2, and also at least ptr-sized (POSIX rules).
178 if !align.is_power_of_two() {
179 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
181 if align < this.pointer_size().bytes() {
183 "posix_memalign: alignment must be at least the size of a pointer, but is {}",
189 this.write_null(ret.into())?;
191 let ptr = this.memory_mut().allocate(
192 Size::from_bytes(size),
193 Align::from_bytes(align).unwrap(),
194 MiriMemoryKind::C.into()
196 this.write_scalar(Scalar::Ptr(ptr), ret.into())?;
198 this.write_null(dest)?;
201 let ptr = this.read_scalar(args[0])?.not_undef()?;
202 this.free(ptr, MiriMemoryKind::C)?;
205 let old_ptr = this.read_scalar(args[0])?.not_undef()?;
206 let new_size = this.read_scalar(args[1])?.to_usize(this)?;
207 let res = this.realloc(old_ptr, new_size, MiriMemoryKind::C)?;
208 this.write_scalar(res, dest)?;
212 let size = this.read_scalar(args[0])?.to_usize(this)?;
213 let align = this.read_scalar(args[1])?.to_usize(this)?;
215 throw_unsup!(HeapAllocZeroBytes);
217 if !align.is_power_of_two() {
218 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
220 let ptr = this.memory_mut()
222 Size::from_bytes(size),
223 Align::from_bytes(align).unwrap(),
224 MiriMemoryKind::Rust.into()
226 this.write_scalar(Scalar::Ptr(ptr), dest)?;
228 "__rust_alloc_zeroed" => {
229 let size = this.read_scalar(args[0])?.to_usize(this)?;
230 let align = this.read_scalar(args[1])?.to_usize(this)?;
232 throw_unsup!(HeapAllocZeroBytes);
234 if !align.is_power_of_two() {
235 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
237 let ptr = this.memory_mut()
239 Size::from_bytes(size),
240 Align::from_bytes(align).unwrap(),
241 MiriMemoryKind::Rust.into()
243 // We just allocated this, the access cannot fail
245 .get_mut(ptr.alloc_id).unwrap()
246 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
247 this.write_scalar(Scalar::Ptr(ptr), dest)?;
249 "__rust_dealloc" => {
250 let ptr = this.read_scalar(args[0])?.not_undef()?;
251 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
252 let align = this.read_scalar(args[2])?.to_usize(this)?;
254 throw_unsup!(HeapAllocZeroBytes);
256 if !align.is_power_of_two() {
257 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
259 let ptr = this.force_ptr(ptr)?;
260 this.memory_mut().deallocate(
262 Some((Size::from_bytes(old_size), Align::from_bytes(align).unwrap())),
263 MiriMemoryKind::Rust.into(),
266 "__rust_realloc" => {
267 let ptr = this.read_scalar(args[0])?.to_ptr()?;
268 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
269 let align = this.read_scalar(args[2])?.to_usize(this)?;
270 let new_size = this.read_scalar(args[3])?.to_usize(this)?;
271 if old_size == 0 || new_size == 0 {
272 throw_unsup!(HeapAllocZeroBytes);
274 if !align.is_power_of_two() {
275 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
277 let align = Align::from_bytes(align).unwrap();
278 let new_ptr = this.memory_mut().reallocate(
280 Some((Size::from_bytes(old_size), align)),
281 Size::from_bytes(new_size),
283 MiriMemoryKind::Rust.into(),
285 this.write_scalar(Scalar::Ptr(new_ptr), dest)?;
289 let sys_getrandom = this.eval_path_scalar(&["libc", "SYS_getrandom"])?
290 .expect("Failed to get libc::SYS_getrandom")
293 // `libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)`
294 // is called if a `HashMap` is created the regular way (e.g. HashMap<K, V>).
295 match this.read_scalar(args[0])?.to_usize(this)? {
296 id if id == sys_getrandom => {
297 // The first argument is the syscall id,
299 linux_getrandom(this, &args[1..], dest)?;
302 throw_unsup_format!("miri does not support syscall ID {}", id)
308 linux_getrandom(this, args, dest)?;
312 let _handle = this.read_scalar(args[0])?;
313 let symbol = this.read_scalar(args[1])?.not_undef()?;
314 let symbol_name = this.memory().read_c_str(symbol)?;
315 let err = format!("bad c unicode symbol: {:?}", symbol_name);
316 let symbol_name = ::std::str::from_utf8(symbol_name).unwrap_or(&err);
317 if let Some(dlsym) = Dlsym::from_str(symbol_name)? {
318 let ptr = this.memory_mut().create_fn_alloc(FnVal::Other(dlsym));
319 this.write_scalar(Scalar::from(ptr), dest)?;
321 this.write_null(dest)?;
325 "__rust_maybe_catch_panic" => {
326 // fn __rust_maybe_catch_panic(
329 // data_ptr: *mut usize,
330 // vtable_ptr: *mut usize,
332 // We abort on panic, so not much is going on here, but we still have to call the closure.
333 let f = this.read_scalar(args[0])?.not_undef()?;
334 let data = this.read_scalar(args[1])?.not_undef()?;
335 let f_instance = this.memory().get_fn(f)?.as_instance()?;
336 this.write_null(dest)?;
337 trace!("__rust_maybe_catch_panic: {:?}", f_instance);
339 // Now we make a function call.
340 // TODO: consider making this reusable? `InterpCx::step` does something similar
341 // for the TLS destructors, and of course `eval_main`.
342 let mir = this.load_mir(f_instance.def)?;
343 let ret_place = MPlaceTy::dangling(this.layout_of(this.tcx.mk_unit())?, this).into();
344 this.push_stack_frame(
349 // Directly return to caller.
350 StackPopCleanup::Goto(Some(ret)),
352 let mut args = this.frame().body.args_iter();
354 let arg_local = args.next()
355 .expect("Argument to __rust_maybe_catch_panic does not take enough arguments.");
356 let arg_dest = this.local_place(arg_local)?;
357 this.write_scalar(data, arg_dest)?;
359 assert!(args.next().is_none(), "__rust_maybe_catch_panic argument has more arguments than expected");
361 // We ourselves will return `0`, eventually (because we will not return if we paniced).
362 this.write_null(dest)?;
364 // Don't fall through, we do *not* want to `goto_block`!
369 let left = this.read_scalar(args[0])?.not_undef()?;
370 let right = this.read_scalar(args[1])?.not_undef()?;
371 let n = Size::from_bytes(this.read_scalar(args[2])?.to_usize(this)?);
374 let left_bytes = this.memory().read_bytes(left, n)?;
375 let right_bytes = this.memory().read_bytes(right, n)?;
377 use std::cmp::Ordering::*;
378 match left_bytes.cmp(right_bytes) {
386 Scalar::from_int(result, Size::from_bits(32)),
392 let ptr = this.read_scalar(args[0])?.not_undef()?;
393 let val = this.read_scalar(args[1])?.to_i32()? as u8;
394 let num = this.read_scalar(args[2])?.to_usize(this)?;
395 if let Some(idx) = this.memory().read_bytes(ptr, Size::from_bytes(num))?
396 .iter().rev().position(|&c| c == val)
398 let new_ptr = ptr.ptr_offset(Size::from_bytes(num - idx as u64 - 1), this)?;
399 this.write_scalar(new_ptr, dest)?;
401 this.write_null(dest)?;
406 let ptr = this.read_scalar(args[0])?.not_undef()?;
407 let val = this.read_scalar(args[1])?.to_i32()? as u8;
408 let num = this.read_scalar(args[2])?.to_usize(this)?;
411 .read_bytes(ptr, Size::from_bytes(num))?
413 .position(|&c| c == val);
414 if let Some(idx) = idx {
415 let new_ptr = ptr.ptr_offset(Size::from_bytes(idx as u64), this)?;
416 this.write_scalar(new_ptr, dest)?;
418 this.write_null(dest)?;
424 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
425 let name = this.memory().read_c_str(name_ptr)?;
426 match this.machine.env_vars.get(name) {
427 Some(&var) => Scalar::Ptr(var),
428 None => Scalar::ptr_null(&*this.tcx),
431 this.write_scalar(result, dest)?;
435 let mut success = None;
437 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
438 if !this.is_null(name_ptr)? {
439 let name = this.memory().read_c_str(name_ptr)?.to_owned();
440 if !name.is_empty() && !name.contains(&b'=') {
441 success = Some(this.machine.env_vars.remove(&name));
445 if let Some(old) = success {
446 if let Some(var) = old {
447 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
449 this.write_null(dest)?;
451 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
458 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
459 let value_ptr = this.read_scalar(args[1])?.not_undef()?;
460 let value = this.memory().read_c_str(value_ptr)?;
461 if !this.is_null(name_ptr)? {
462 let name = this.memory().read_c_str(name_ptr)?;
463 if !name.is_empty() && !name.contains(&b'=') {
464 new = Some((name.to_owned(), value.to_owned()));
468 if let Some((name, value)) = new {
469 let value_copy = alloc_env_value(&value, this.memory_mut(), tcx);
470 if let Some(var) = this.machine.env_vars.insert(name.to_owned(), value_copy) {
471 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
473 this.write_null(dest)?;
475 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
480 let fd = this.read_scalar(args[0])?.to_i32()?;
481 let buf = this.read_scalar(args[1])?.not_undef()?;
482 let n = this.read_scalar(args[2])?.to_usize(&*this.tcx)?;
483 trace!("Called write({:?}, {:?}, {:?})", fd, buf, n);
484 let result = if fd == 1 || fd == 2 {
486 use std::io::{self, Write};
488 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(n))?;
489 // We need to flush to make sure this actually appears on the screen
490 let res = if fd == 1 {
491 // Stdout is buffered, flush to make sure it appears on the screen.
492 // This is the write() syscall of the interpreted program, we want it
493 // to correspond to a write() syscall on the host -- there is no good
494 // in adding extra buffering here.
495 let res = io::stdout().write(buf_cont);
496 io::stdout().flush().unwrap();
499 // No need to flush, stderr is not buffered.
500 io::stderr().write(buf_cont)
507 eprintln!("Miri: Ignored output to FD {}", fd);
508 // Pretend it all went well.
511 // Now, `result` is the value we return back to the program.
513 Scalar::from_int(result, dest.layout.size),
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)?;
526 "cbrtf" | "coshf" | "sinhf" |"tanf" => {
527 // FIXME: Using host floats.
528 let f = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
529 let f = match link_name {
536 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
538 // underscore case for windows
539 "_hypotf" | "hypotf" | "atan2f" => {
540 // FIXME: Using host floats.
541 let f1 = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
542 let f2 = f32::from_bits(this.read_scalar(args[1])?.to_u32()?);
543 let n = match link_name {
544 "_hypotf" | "hypotf" => f1.hypot(f2),
545 "atan2f" => f1.atan2(f2),
548 this.write_scalar(Scalar::from_u32(n.to_bits()), dest)?;
551 "cbrt" | "cosh" | "sinh" | "tan" => {
552 // FIXME: Using host floats.
553 let f = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
554 let f = match link_name {
561 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
563 // underscore case for windows
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 // underscore case for windows
576 "_ldexp" | "ldexp" => {
577 // FIXME: Using host floats.
578 let x = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
579 let exp = this.read_scalar(args[1])?.to_i32()?;
580 // FIXME: We should use cmath if there are any imprecisions.
581 let n = x * 2.0f64.powi(exp);
582 this.write_scalar(Scalar::from_u64(n.to_bits()), 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));
954 // Shims the linux 'getrandom()' syscall.
955 fn linux_getrandom<'tcx>(
956 this: &mut MiriEvalContext<'_, 'tcx>,
957 args: &[OpTy<'tcx, Tag>],
958 dest: PlaceTy<'tcx, Tag>,
959 ) -> InterpResult<'tcx> {
960 let ptr = this.read_scalar(args[0])?.not_undef()?;
961 let len = this.read_scalar(args[1])?.to_usize(this)?;
963 // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
964 // neither of which have any effect on our current PRNG.
965 let _flags = this.read_scalar(args[2])?.to_i32()?;
967 this.gen_random(ptr, len as usize)?;
968 this.write_scalar(Scalar::from_uint(len, dest.layout.size), dest)?;