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)?;
352 args.next().expect_none("__rust_maybe_catch_panic argument has more arguments than expected");
354 // We ourselves will return `0`, eventually (because we will not return if we paniced).
355 this.write_null(dest)?;
357 // Don't fall through, we do *not* want to `goto_block`!
362 let left = this.read_scalar(args[0])?.not_undef()?;
363 let right = this.read_scalar(args[1])?.not_undef()?;
364 let n = Size::from_bytes(this.read_scalar(args[2])?.to_usize(this)?);
367 let left_bytes = this.memory.read_bytes(left, n)?;
368 let right_bytes = this.memory.read_bytes(right, n)?;
370 use std::cmp::Ordering::*;
371 match left_bytes.cmp(right_bytes) {
378 this.write_scalar(Scalar::from_int(result, Size::from_bits(32)), dest)?;
382 let ptr = this.read_scalar(args[0])?.not_undef()?;
383 let val = this.read_scalar(args[1])?.to_i32()? as u8;
384 let num = this.read_scalar(args[2])?.to_usize(this)?;
385 if let Some(idx) = this
387 .read_bytes(ptr, Size::from_bytes(num))?
390 .position(|&c| c == val)
392 let new_ptr = ptr.ptr_offset(Size::from_bytes(num - idx as u64 - 1), this)?;
393 this.write_scalar(new_ptr, dest)?;
395 this.write_null(dest)?;
400 let ptr = this.read_scalar(args[0])?.not_undef()?;
401 let val = this.read_scalar(args[1])?.to_i32()? as u8;
402 let num = this.read_scalar(args[2])?.to_usize(this)?;
405 .read_bytes(ptr, Size::from_bytes(num))?
407 .position(|&c| c == val);
408 if let Some(idx) = idx {
409 let new_ptr = ptr.ptr_offset(Size::from_bytes(idx as u64), this)?;
410 this.write_scalar(new_ptr, dest)?;
412 this.write_null(dest)?;
416 "__errno_location" | "__error" => {
417 let errno_place = this.machine.last_error.unwrap();
418 let errno_scalar: Scalar<Tag> = this.check_mplace_access(errno_place.into(), Some(Size::from_bits(32)))?.unwrap().into();
419 this.write_scalar(errno_scalar, dest)?;
423 let result = this.getenv(args[0])?;
424 this.write_scalar(result, dest)?;
428 let result = this.unsetenv(args[0])?;
429 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
433 let result = this.setenv(args[0], args[1])?;
434 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
438 let result = this.getcwd(args[0], args[1])?;
439 this.write_scalar(result, dest)?;
443 let result = this.chdir(args[0])?;
444 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
447 "open" | "open64" => {
448 let result = this.open(args[0], args[1])?;
449 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
453 let result = this.fcntl(args[0], args[1], args.get(2).cloned())?;
454 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
457 "close" | "close$NOCANCEL" => {
458 let result = this.close(args[0])?;
459 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
463 let result = this.read(args[0], args[1], args[2])?;
464 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
468 let fd = this.read_scalar(args[0])?.to_i32()?;
469 let buf = this.read_scalar(args[1])?.not_undef()?;
470 let n = this.read_scalar(args[2])?.to_usize(tcx)?;
471 trace!("Called write({:?}, {:?}, {:?})", fd, buf, n);
472 let result = if fd == 1 || fd == 2 {
474 use std::io::{self, Write};
476 let buf_cont = this.memory.read_bytes(buf, Size::from_bytes(n))?;
477 // We need to flush to make sure this actually appears on the screen
478 let res = if fd == 1 {
479 // Stdout is buffered, flush to make sure it appears on the screen.
480 // This is the write() syscall of the interpreted program, we want it
481 // to correspond to a write() syscall on the host -- there is no good
482 // in adding extra buffering here.
483 let res = io::stdout().write(buf_cont);
484 io::stdout().flush().unwrap();
487 // No need to flush, stderr is not buffered.
488 io::stderr().write(buf_cont)
495 this.write(args[0], args[1], args[2])?
497 // Now, `result` is the value we return back to the program.
498 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
502 let result = this.unlink(args[0])?;
503 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
507 let result = this.clock_gettime(args[0], args[1])?;
508 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
512 let result = this.gettimeofday(args[0], args[1])?;
513 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
517 let ptr = this.read_scalar(args[0])?.not_undef()?;
518 let n = this.memory.read_c_str(ptr)?.len();
519 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
523 "cbrtf" | "coshf" | "sinhf" | "tanf" => {
524 // FIXME: Using host floats.
525 let f = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
526 let f = match link_name {
533 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
535 // underscore case for windows
536 "_hypotf" | "hypotf" | "atan2f" => {
537 // FIXME: Using host floats.
538 let f1 = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
539 let f2 = f32::from_bits(this.read_scalar(args[1])?.to_u32()?);
540 let n = match link_name {
541 "_hypotf" | "hypotf" => f1.hypot(f2),
542 "atan2f" => f1.atan2(f2),
545 this.write_scalar(Scalar::from_u32(n.to_bits()), dest)?;
548 "cbrt" | "cosh" | "sinh" | "tan" => {
549 // FIXME: Using host floats.
550 let f = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
551 let f = match link_name {
558 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
560 // underscore case for windows, here and below
561 // (see https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/floating-point-primitives?view=vs-2019)
562 "_hypot" | "hypot" | "atan2" => {
563 // FIXME: Using host floats.
564 let f1 = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
565 let f2 = f64::from_bits(this.read_scalar(args[1])?.to_u64()?);
566 let n = match link_name {
567 "_hypot" | "hypot" => f1.hypot(f2),
568 "atan2" => f1.atan2(f2),
571 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
573 // For radix-2 (binary) systems, `ldexp` and `scalbn` are the same.
574 "_ldexp" | "ldexp" | "scalbn" => {
575 let x = this.read_scalar(args[0])?.to_f64()?;
576 let exp = this.read_scalar(args[1])?.to_i32()?;
578 // Saturating cast to i16. Even those are outside the valid exponent range to
579 // `scalbn` below will do its over/underflow handling.
580 let exp = if exp > i16::max_value() as i32 {
582 } else if exp < i16::min_value() as i32 {
585 exp.try_into().unwrap()
588 let res = x.scalbn(exp);
589 this.write_scalar(Scalar::from_f64(res), dest)?;
592 // Some things needed for `sys::thread` initialization to go through.
593 "signal" | "sigaction" | "sigaltstack" => {
594 this.write_scalar(Scalar::from_int(0, dest.layout.size), dest)?;
598 let name = this.read_scalar(args[0])?.to_i32()?;
600 trace!("sysconf() called with name {}", name);
601 // TODO: Cache the sysconf integers via Miri's global cache.
604 &["libc", "_SC_PAGESIZE"],
605 Scalar::from_int(PAGE_SIZE, dest.layout.size),
608 &["libc", "_SC_GETPW_R_SIZE_MAX"],
609 Scalar::from_int(-1, dest.layout.size),
612 &["libc", "_SC_NPROCESSORS_ONLN"],
613 Scalar::from_int(NUM_CPUS, dest.layout.size),
616 let mut result = None;
617 for &(path, path_value) in paths {
618 if let Some(val) = this.eval_path_scalar(path)? {
619 let val = val.to_i32()?;
621 result = Some(path_value);
626 if let Some(result) = result {
627 this.write_scalar(result, dest)?;
629 throw_unsup_format!("Unimplemented sysconf name: {}", name)
633 "sched_getaffinity" => {
634 // Return an error; `num_cpus` then falls back to `sysconf`.
635 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
639 this.write_null(dest)?;
642 // Hook pthread calls that go to the thread-local storage memory subsystem.
643 "pthread_key_create" => {
644 let key_place = this.deref_operand(args[0])?;
646 // Extract the function type out of the signature (that seems easier than constructing it ourselves).
647 let dtor = match this.test_null(this.read_scalar(args[1])?.not_undef()?)? {
648 Some(dtor_ptr) => Some(this.memory.get_fn(dtor_ptr)?.as_instance()?),
652 // Figure out how large a pthread TLS key actually is.
653 // This is `libc::pthread_key_t`.
654 let key_type = args[0].layout.ty
656 .ok_or_else(|| err_ub_format!(
657 "wrong signature used for `pthread_key_create`: first argument must be a raw pointer."
660 let key_layout = this.layout_of(key_type)?;
662 // Create key and write it into the memory where `key_ptr` wants it.
663 let key = this.machine.tls.create_tls_key(dtor) as u128;
664 if key_layout.size.bits() < 128 && key >= (1u128 << key_layout.size.bits() as u128)
666 throw_unsup!(OutOfTls);
669 this.write_scalar(Scalar::from_uint(key, key_layout.size), key_place.into())?;
671 // Return success (`0`).
672 this.write_null(dest)?;
674 "pthread_key_delete" => {
675 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
676 this.machine.tls.delete_tls_key(key)?;
677 // Return success (0)
678 this.write_null(dest)?;
680 "pthread_getspecific" => {
681 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
682 let ptr = this.machine.tls.load_tls(key, tcx)?;
683 this.write_scalar(ptr, dest)?;
685 "pthread_setspecific" => {
686 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
687 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
688 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
690 // Return success (`0`).
691 this.write_null(dest)?;
694 // Stack size/address stuff.
696 | "pthread_attr_destroy"
698 | "pthread_attr_setstacksize" => {
699 this.write_null(dest)?;
701 "pthread_attr_getstack" => {
702 let addr_place = this.deref_operand(args[1])?;
703 let size_place = this.deref_operand(args[2])?;
706 Scalar::from_uint(STACK_ADDR, addr_place.layout.size),
710 Scalar::from_uint(STACK_SIZE, size_place.layout.size),
714 // Return success (`0`).
715 this.write_null(dest)?;
718 // We don't support threading. (Also for Windows.)
719 "pthread_create" | "CreateThread" => {
720 throw_unsup_format!("Miri does not support threading");
723 // Stub out calls for condvar, mutex and rwlock, to just return `0`.
724 "pthread_mutexattr_init"
725 | "pthread_mutexattr_settype"
726 | "pthread_mutex_init"
727 | "pthread_mutexattr_destroy"
728 | "pthread_mutex_lock"
729 | "pthread_mutex_unlock"
730 | "pthread_mutex_destroy"
731 | "pthread_rwlock_rdlock"
732 | "pthread_rwlock_unlock"
733 | "pthread_rwlock_wrlock"
734 | "pthread_rwlock_destroy"
735 | "pthread_condattr_init"
736 | "pthread_condattr_setclock"
737 | "pthread_cond_init"
738 | "pthread_condattr_destroy"
739 | "pthread_cond_destroy" => {
740 this.write_null(dest)?;
743 // We don't support fork so we don't have to do anything for atfork.
744 "pthread_atfork" => {
745 this.write_null(dest)?;
749 // 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.
750 let addr = this.read_scalar(args[0])?.not_undef()?;
751 this.write_scalar(addr, dest)?;
754 this.write_null(dest)?;
758 "pthread_attr_get_np" | "pthread_getattr_np" => {
759 this.write_null(dest)?;
761 "pthread_get_stackaddr_np" => {
762 let stack_addr = Scalar::from_uint(STACK_ADDR, dest.layout.size);
763 this.write_scalar(stack_addr, dest)?;
765 "pthread_get_stacksize_np" => {
766 let stack_size = Scalar::from_uint(STACK_SIZE, dest.layout.size);
767 this.write_scalar(stack_size, dest)?;
770 // FIXME: register the destructor.
773 this.write_scalar(Scalar::Ptr(this.machine.argc.unwrap()), dest)?;
776 this.write_scalar(Scalar::Ptr(this.machine.argv.unwrap()), dest)?;
778 "SecRandomCopyBytes" => {
779 let len = this.read_scalar(args[1])?.to_usize(this)?;
780 let ptr = this.read_scalar(args[2])?.not_undef()?;
781 this.gen_random(ptr, len as usize)?;
782 this.write_null(dest)?;
785 // Windows API stubs.
787 // DWORD = ULONG = u32
789 "GetProcessHeap" => {
790 // Just fake a HANDLE
791 this.write_scalar(Scalar::from_int(1, this.pointer_size()), dest)?;
794 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
795 let flags = this.read_scalar(args[1])?.to_u32()?;
796 let size = this.read_scalar(args[2])?.to_usize(this)?;
797 let zero_init = (flags & 0x00000008) != 0; // HEAP_ZERO_MEMORY
798 let res = this.malloc(size, zero_init, MiriMemoryKind::WinHeap);
799 this.write_scalar(res, dest)?;
802 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
803 let _flags = this.read_scalar(args[1])?.to_u32()?;
804 let ptr = this.read_scalar(args[2])?.not_undef()?;
805 this.free(ptr, MiriMemoryKind::WinHeap)?;
806 this.write_scalar(Scalar::from_int(1, Size::from_bytes(4)), dest)?;
809 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
810 let _flags = this.read_scalar(args[1])?.to_u32()?;
811 let ptr = this.read_scalar(args[2])?.not_undef()?;
812 let size = this.read_scalar(args[3])?.to_usize(this)?;
813 let res = this.realloc(ptr, size, MiriMemoryKind::WinHeap)?;
814 this.write_scalar(res, dest)?;
818 this.set_last_error(this.read_scalar(args[0])?.not_undef()?)?;
821 let last_error = this.get_last_error()?;
822 this.write_scalar(last_error, dest)?;
825 "AddVectoredExceptionHandler" => {
826 // Any non zero value works for the stdlib. This is just used for stack overflows anyway.
827 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
829 "InitializeCriticalSection"
830 | "EnterCriticalSection"
831 | "LeaveCriticalSection"
832 | "DeleteCriticalSection" => {
833 // Nothing to do, not even a return value.
837 | "TryEnterCriticalSection"
838 | "GetConsoleScreenBufferInfo"
839 | "SetConsoleTextAttribute" => {
840 // Pretend these do not exist / nothing happened, by returning zero.
841 this.write_null(dest)?;
844 let system_info = this.deref_operand(args[0])?;
845 let system_info_ptr = this
846 .check_mplace_access(system_info, None)?
847 .expect("cannot be a ZST");
848 // We rely on `deref_operand` doing bounds checks for us.
849 // Initialize with `0`.
851 .get_mut(system_info_ptr.alloc_id)?
852 .write_repeat(tcx, system_info_ptr, 0, system_info.layout.size)?;
853 // Set number of processors.
854 let dword_size = Size::from_bytes(4);
855 let offset = 2 * dword_size + 3 * tcx.pointer_size();
857 .get_mut(system_info_ptr.alloc_id)?
860 system_info_ptr.offset(offset, tcx)?,
861 Scalar::from_int(NUM_CPUS, dword_size).into(),
867 // This just creates a key; Windows does not natively support TLS destructors.
869 // Create key and return it.
870 let key = this.machine.tls.create_tls_key(None) as u128;
872 // Figure out how large a TLS key actually is. This is `c::DWORD`.
873 if dest.layout.size.bits() < 128
874 && key >= (1u128 << dest.layout.size.bits() as u128)
876 throw_unsup!(OutOfTls);
878 this.write_scalar(Scalar::from_uint(key, dest.layout.size), dest)?;
881 let key = this.read_scalar(args[0])?.to_u32()? as u128;
882 let ptr = this.machine.tls.load_tls(key, tcx)?;
883 this.write_scalar(ptr, dest)?;
886 let key = this.read_scalar(args[0])?.to_u32()? as u128;
887 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
888 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
890 // Return success (`1`).
891 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
894 let which = this.read_scalar(args[0])?.to_i32()?;
895 // We just make this the identity function, so we know later in `WriteFile`
897 this.write_scalar(Scalar::from_int(which, this.pointer_size()), dest)?;
900 let handle = this.read_scalar(args[0])?.to_isize(this)?;
901 let buf = this.read_scalar(args[1])?.not_undef()?;
902 let n = this.read_scalar(args[2])?.to_u32()?;
903 let written_place = this.deref_operand(args[3])?;
904 // Spec says to always write `0` first.
905 this.write_null(written_place.into())?;
906 let written = if handle == -11 || handle == -12 {
908 use std::io::{self, Write};
912 .read_bytes(buf, Size::from_bytes(u64::from(n)))?;
913 let res = if handle == -11 {
914 io::stdout().write(buf_cont)
916 io::stderr().write(buf_cont)
918 res.ok().map(|n| n as u32)
920 eprintln!("Miri: Ignored output to handle {}", handle);
921 // Pretend it all went well.
924 // If there was no error, write back how much was written.
925 if let Some(n) = written {
926 this.write_scalar(Scalar::from_u32(n), written_place.into())?;
928 // Return whether this was a success.
930 Scalar::from_int(if written.is_some() { 1 } else { 0 }, dest.layout.size),
934 "GetConsoleMode" => {
935 // Everything is a pipe.
936 this.write_null(dest)?;
938 "GetEnvironmentVariableW" => {
939 // This is not the env var you are looking for.
940 this.set_last_error(Scalar::from_u32(203))?; // ERROR_ENVVAR_NOT_FOUND
941 this.write_null(dest)?;
943 "GetCommandLineW" => {
944 this.write_scalar(Scalar::Ptr(this.machine.cmd_line.unwrap()), dest)?;
946 // The actual name of 'RtlGenRandom'
947 "SystemFunction036" => {
948 let ptr = this.read_scalar(args[0])?.not_undef()?;
949 let len = this.read_scalar(args[1])?.to_u32()?;
950 this.gen_random(ptr, len as usize)?;
951 this.write_scalar(Scalar::from_bool(true), dest)?;
954 // We can't execute anything else.
955 _ => throw_unsup_format!("can't call foreign function: {}", link_name),
958 this.goto_block(Some(ret))?;
959 this.dump_place(*dest);
963 /// Evaluates the scalar at the specified path. Returns Some(val)
964 /// if the path could be resolved, and None otherwise
968 ) -> InterpResult<'tcx, Option<ScalarMaybeUndef<Tag>>> {
969 let this = self.eval_context_mut();
970 if let Ok(instance) = this.resolve_path(path) {
975 let const_val = this.const_eval_raw(cid)?;
976 let const_val = this.read_scalar(const_val.into())?;
977 return Ok(Some(const_val));
983 // Shims the linux 'getrandom()' syscall.
984 fn linux_getrandom<'tcx>(
985 this: &mut MiriEvalContext<'_, 'tcx>,
986 args: &[OpTy<'tcx, Tag>],
987 dest: PlaceTy<'tcx, Tag>,
988 ) -> InterpResult<'tcx> {
989 let ptr = this.read_scalar(args[0])?.not_undef()?;
990 let len = this.read_scalar(args[1])?.to_usize(this)?;
992 // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
993 // neither of which have any effect on our current PRNG.
994 let _flags = this.read_scalar(args[2])?.to_i32()?;
996 this.gen_random(ptr, len as usize)?;
997 this.write_scalar(Scalar::from_uint(len, dest.layout.size), dest)?;