1 use rustc::ty::layout::{Align, LayoutOf, Size};
2 use rustc::hir::def_id::DefId;
5 use syntax::symbol::sym;
9 impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
10 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
11 /// Returns the minimum alignment for the target architecture for allocations of the given size.
12 fn min_align(&self, size: u64, kind: MiriMemoryKind) -> Align {
13 let this = self.eval_context_ref();
14 // List taken from `libstd/sys_common/alloc.rs`.
15 let min_align = match this.tcx.tcx.sess.target.target.arch.as_str() {
16 "x86" | "arm" | "mips" | "powerpc" | "powerpc64" | "asmjs" | "wasm32" => 8,
17 "x86_64" | "aarch64" | "mips64" | "s390x" | "sparc64" => 16,
18 arch => bug!("Unsupported target architecture: {}", arch),
20 // Windows always aligns, even small allocations.
21 // Source: <https://support.microsoft.com/en-us/help/286470/how-to-use-pageheap-exe-in-windows-xp-windows-2000-and-windows-server>
22 // But jemalloc does not, so for the C heap we only align if the allocation is sufficiently big.
23 if kind == MiriMemoryKind::WinHeap || size >= min_align {
24 return Align::from_bytes(min_align).unwrap();
26 // We have `size < min_align`. Round `size` *down* to the next power of two and use that.
27 fn prev_power_of_two(x: u64) -> u64 {
28 let next_pow2 = x.next_power_of_two();
30 // x *is* a power of two, just use that.
33 // x is between two powers, so next = 2*prev.
37 Align::from_bytes(prev_power_of_two(size)).unwrap()
46 let this = self.eval_context_mut();
47 let tcx = &{this.tcx.tcx};
49 Scalar::from_int(0, this.pointer_size())
51 let align = this.min_align(size, kind);
52 let ptr = this.memory_mut().allocate(Size::from_bytes(size), align, kind.into());
54 // We just allocated this, the access cannot fail
56 .get_mut(ptr.alloc_id).unwrap()
57 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
67 ) -> InterpResult<'tcx> {
68 let this = self.eval_context_mut();
69 if !this.is_null(ptr)? {
70 let ptr = this.force_ptr(ptr)?;
71 this.memory_mut().deallocate(
85 ) -> InterpResult<'tcx, Scalar<Tag>> {
86 let this = self.eval_context_mut();
87 let new_align = this.min_align(new_size, kind);
88 if this.is_null(old_ptr)? {
90 Ok(Scalar::from_int(0, this.pointer_size()))
92 let new_ptr = this.memory_mut().allocate(
93 Size::from_bytes(new_size),
97 Ok(Scalar::Ptr(new_ptr))
100 let old_ptr = this.force_ptr(old_ptr)?;
101 let memory = this.memory_mut();
108 Ok(Scalar::from_int(0, this.pointer_size()))
110 let new_ptr = memory.reallocate(
113 Size::from_bytes(new_size),
117 Ok(Scalar::Ptr(new_ptr))
122 /// Emulates calling a foreign item, failing if the item is not supported.
123 /// This function will handle `goto_block` if needed.
124 fn emulate_foreign_item(
127 args: &[OpTy<'tcx, Tag>],
128 dest: Option<PlaceTy<'tcx, Tag>>,
129 ret: Option<mir::BasicBlock>,
130 ) -> InterpResult<'tcx> {
131 let this = self.eval_context_mut();
132 let attrs = this.tcx.get_attrs(def_id);
133 let link_name = match attr::first_attr_value_str_by_name(&attrs, sym::link_name) {
134 Some(name) => name.as_str(),
135 None => this.tcx.item_name(def_id).as_str(),
137 // Strip linker suffixes (seen on 32-bit macOS).
138 let link_name = link_name.get().trim_end_matches("$UNIX2003");
139 let tcx = &{this.tcx.tcx};
141 // First: functions that diverge.
143 "__rust_start_panic" | "panic_impl" => {
144 throw_unsup_format!("the evaluated program panicked");
146 "exit" | "ExitProcess" => {
147 // it's really u32 for ExitProcess, but we have to put it into the `Exit` error variant anyway
148 let code = this.read_scalar(args[0])?.to_i32()?;
149 return Err(InterpError::Exit(code).into());
151 _ => if dest.is_none() {
152 throw_unsup_format!("can't call (diverging) foreign function: {}", link_name);
156 // Next: functions that assume a ret and dest.
157 let dest = dest.expect("we already checked for a dest");
158 let ret = ret.expect("dest is `Some` but ret is `None`");
161 let size = this.read_scalar(args[0])?.to_usize(this)?;
162 let res = this.malloc(size, /*zero_init:*/ false, MiriMemoryKind::C);
163 this.write_scalar(res, dest)?;
166 let items = this.read_scalar(args[0])?.to_usize(this)?;
167 let len = this.read_scalar(args[1])?.to_usize(this)?;
168 let size = items.checked_mul(len).ok_or_else(|| err_panic!(Overflow(mir::BinOp::Mul)))?;
169 let res = this.malloc(size, /*zero_init:*/ true, MiriMemoryKind::C);
170 this.write_scalar(res, dest)?;
172 "posix_memalign" => {
173 let ret = this.deref_operand(args[0])?;
174 let align = this.read_scalar(args[1])?.to_usize(this)?;
175 let size = this.read_scalar(args[2])?.to_usize(this)?;
176 // Align must be power of 2, and also at least ptr-sized (POSIX rules).
177 if !align.is_power_of_two() {
178 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
180 if align < this.pointer_size().bytes() {
182 "posix_memalign: alignment must be at least the size of a pointer, but is {}",
188 this.write_null(ret.into())?;
190 let ptr = this.memory_mut().allocate(
191 Size::from_bytes(size),
192 Align::from_bytes(align).unwrap(),
193 MiriMemoryKind::C.into()
195 this.write_scalar(Scalar::Ptr(ptr), ret.into())?;
197 this.write_null(dest)?;
200 let ptr = this.read_scalar(args[0])?.not_undef()?;
201 this.free(ptr, MiriMemoryKind::C)?;
204 let old_ptr = this.read_scalar(args[0])?.not_undef()?;
205 let new_size = this.read_scalar(args[1])?.to_usize(this)?;
206 let res = this.realloc(old_ptr, new_size, MiriMemoryKind::C)?;
207 this.write_scalar(res, dest)?;
211 let size = this.read_scalar(args[0])?.to_usize(this)?;
212 let align = this.read_scalar(args[1])?.to_usize(this)?;
214 throw_unsup!(HeapAllocZeroBytes);
216 if !align.is_power_of_two() {
217 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
219 let ptr = this.memory_mut()
221 Size::from_bytes(size),
222 Align::from_bytes(align).unwrap(),
223 MiriMemoryKind::Rust.into()
225 this.write_scalar(Scalar::Ptr(ptr), dest)?;
227 "__rust_alloc_zeroed" => {
228 let size = this.read_scalar(args[0])?.to_usize(this)?;
229 let align = this.read_scalar(args[1])?.to_usize(this)?;
231 throw_unsup!(HeapAllocZeroBytes);
233 if !align.is_power_of_two() {
234 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
236 let ptr = this.memory_mut()
238 Size::from_bytes(size),
239 Align::from_bytes(align).unwrap(),
240 MiriMemoryKind::Rust.into()
242 // We just allocated this, the access cannot fail
244 .get_mut(ptr.alloc_id).unwrap()
245 .write_repeat(tcx, ptr, 0, Size::from_bytes(size)).unwrap();
246 this.write_scalar(Scalar::Ptr(ptr), dest)?;
248 "__rust_dealloc" => {
249 let ptr = this.read_scalar(args[0])?.not_undef()?;
250 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
251 let align = this.read_scalar(args[2])?.to_usize(this)?;
253 throw_unsup!(HeapAllocZeroBytes);
255 if !align.is_power_of_two() {
256 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
258 let ptr = this.force_ptr(ptr)?;
259 this.memory_mut().deallocate(
261 Some((Size::from_bytes(old_size), Align::from_bytes(align).unwrap())),
262 MiriMemoryKind::Rust.into(),
265 "__rust_realloc" => {
266 let ptr = this.read_scalar(args[0])?.to_ptr()?;
267 let old_size = this.read_scalar(args[1])?.to_usize(this)?;
268 let align = this.read_scalar(args[2])?.to_usize(this)?;
269 let new_size = this.read_scalar(args[3])?.to_usize(this)?;
270 if old_size == 0 || new_size == 0 {
271 throw_unsup!(HeapAllocZeroBytes);
273 if !align.is_power_of_two() {
274 throw_unsup!(HeapAllocNonPowerOfTwoAlignment(align));
276 let align = Align::from_bytes(align).unwrap();
277 let new_ptr = this.memory_mut().reallocate(
279 Some((Size::from_bytes(old_size), align)),
280 Size::from_bytes(new_size),
282 MiriMemoryKind::Rust.into(),
284 this.write_scalar(Scalar::Ptr(new_ptr), dest)?;
288 let sys_getrandom = this.eval_path_scalar(&["libc", "SYS_getrandom"])?
289 .expect("Failed to get libc::SYS_getrandom")
292 // `libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)`
293 // is called if a `HashMap` is created the regular way (e.g. HashMap<K, V>).
294 match this.read_scalar(args[0])?.to_usize(this)? {
295 id if id == sys_getrandom => {
296 let ptr = this.read_scalar(args[1])?.not_undef()?;
297 let len = this.read_scalar(args[2])?.to_usize(this)?;
299 // The only supported flags are GRND_RANDOM and GRND_NONBLOCK,
300 // neither of which have any effect on our current PRNG
301 let _flags = this.read_scalar(args[3])?.to_i32()?;
303 this.gen_random(len as usize, ptr)?;
304 this.write_scalar(Scalar::from_uint(len, dest.layout.size), dest)?;
307 throw_unsup_format!("miri does not support syscall ID {}", id)
313 let _handle = this.read_scalar(args[0])?;
314 let symbol = this.read_scalar(args[1])?.not_undef()?;
315 let symbol_name = this.memory().read_c_str(symbol)?;
316 let err = format!("bad c unicode symbol: {:?}", symbol_name);
317 let symbol_name = ::std::str::from_utf8(symbol_name).unwrap_or(&err);
318 if let Some(dlsym) = Dlsym::from_str(symbol_name)? {
319 let ptr = this.memory_mut().create_fn_alloc(FnVal::Other(dlsym));
320 this.write_scalar(Scalar::from(ptr), dest)?;
322 this.write_null(dest)?;
326 "__rust_maybe_catch_panic" => {
327 // fn __rust_maybe_catch_panic(
330 // data_ptr: *mut usize,
331 // vtable_ptr: *mut usize,
333 // We abort on panic, so not much is going on here, but we still have to call the closure.
334 let f = this.read_scalar(args[0])?.not_undef()?;
335 let data = this.read_scalar(args[1])?.not_undef()?;
336 let f_instance = this.memory().get_fn(f)?.as_instance()?;
337 this.write_null(dest)?;
338 trace!("__rust_maybe_catch_panic: {:?}", f_instance);
340 // Now we make a function call.
341 // TODO: consider making this reusable? `InterpCx::step` does something similar
342 // for the TLS destructors, and of course `eval_main`.
343 let mir = this.load_mir(f_instance.def)?;
344 let ret_place = MPlaceTy::dangling(this.layout_of(this.tcx.mk_unit())?, this).into();
345 this.push_stack_frame(
350 // Directly return to caller.
351 StackPopCleanup::Goto(Some(ret)),
353 let mut args = this.frame().body.args_iter();
355 let arg_local = args.next()
356 .expect("Argument to __rust_maybe_catch_panic does not take enough arguments.");
357 let arg_dest = this.local_place(arg_local)?;
358 this.write_scalar(data, arg_dest)?;
360 assert!(args.next().is_none(), "__rust_maybe_catch_panic argument has more arguments than expected");
362 // We ourselves will return `0`, eventually (because we will not return if we paniced).
363 this.write_null(dest)?;
365 // Don't fall through, we do *not* want to `goto_block`!
370 let left = this.read_scalar(args[0])?.not_undef()?;
371 let right = this.read_scalar(args[1])?.not_undef()?;
372 let n = Size::from_bytes(this.read_scalar(args[2])?.to_usize(this)?);
375 let left_bytes = this.memory().read_bytes(left, n)?;
376 let right_bytes = this.memory().read_bytes(right, n)?;
378 use std::cmp::Ordering::*;
379 match left_bytes.cmp(right_bytes) {
387 Scalar::from_int(result, Size::from_bits(32)),
393 let ptr = this.read_scalar(args[0])?.not_undef()?;
394 let val = this.read_scalar(args[1])?.to_i32()? as u8;
395 let num = this.read_scalar(args[2])?.to_usize(this)?;
396 if let Some(idx) = this.memory().read_bytes(ptr, Size::from_bytes(num))?
397 .iter().rev().position(|&c| c == val)
399 let new_ptr = ptr.ptr_offset(Size::from_bytes(num - idx as u64 - 1), this)?;
400 this.write_scalar(new_ptr, dest)?;
402 this.write_null(dest)?;
407 let ptr = this.read_scalar(args[0])?.not_undef()?;
408 let val = this.read_scalar(args[1])?.to_i32()? as u8;
409 let num = this.read_scalar(args[2])?.to_usize(this)?;
412 .read_bytes(ptr, Size::from_bytes(num))?
414 .position(|&c| c == val);
415 if let Some(idx) = idx {
416 let new_ptr = ptr.ptr_offset(Size::from_bytes(idx as u64), this)?;
417 this.write_scalar(new_ptr, dest)?;
419 this.write_null(dest)?;
425 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
426 let name = this.memory().read_c_str(name_ptr)?;
427 match this.machine.env_vars.get(name) {
428 Some(&var) => Scalar::Ptr(var),
429 None => Scalar::ptr_null(&*this.tcx),
432 this.write_scalar(result, dest)?;
436 let mut success = None;
438 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
439 if !this.is_null(name_ptr)? {
440 let name = this.memory().read_c_str(name_ptr)?.to_owned();
441 if !name.is_empty() && !name.contains(&b'=') {
442 success = Some(this.machine.env_vars.remove(&name));
446 if let Some(old) = success {
447 if let Some(var) = old {
448 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
450 this.write_null(dest)?;
452 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
459 let name_ptr = this.read_scalar(args[0])?.not_undef()?;
460 let value_ptr = this.read_scalar(args[1])?.not_undef()?;
461 let value = this.memory().read_c_str(value_ptr)?;
462 if !this.is_null(name_ptr)? {
463 let name = this.memory().read_c_str(name_ptr)?;
464 if !name.is_empty() && !name.contains(&b'=') {
465 new = Some((name.to_owned(), value.to_owned()));
469 if let Some((name, value)) = new {
470 // `+1` for the null terminator.
471 let value_copy = this.memory_mut().allocate(
472 Size::from_bytes((value.len() + 1) as u64),
473 Align::from_bytes(1).unwrap(),
474 MiriMemoryKind::Env.into(),
476 // We just allocated these, so the write cannot fail.
477 let alloc = this.memory_mut().get_mut(value_copy.alloc_id).unwrap();
478 alloc.write_bytes(tcx, value_copy, &value).unwrap();
479 let trailing_zero_ptr = value_copy.offset(
480 Size::from_bytes(value.len() as u64),
483 alloc.write_bytes(tcx, trailing_zero_ptr, &[0]).unwrap();
485 if let Some(var) = this.machine.env_vars.insert(
490 this.memory_mut().deallocate(var, None, MiriMemoryKind::Env.into())?;
492 this.write_null(dest)?;
494 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
499 let fd = this.read_scalar(args[0])?.to_i32()?;
500 let buf = this.read_scalar(args[1])?.not_undef()?;
501 let n = this.read_scalar(args[2])?.to_usize(&*this.tcx)?;
502 trace!("Called write({:?}, {:?}, {:?})", fd, buf, n);
503 let result = if fd == 1 || fd == 2 {
505 use std::io::{self, Write};
507 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(n))?;
508 // We need to flush to make sure this actually appears on the screen
509 let res = if fd == 1 {
510 // Stdout is buffered, flush to make sure it appears on the screen.
511 // This is the write() syscall of the interpreted program, we want it
512 // to correspond to a write() syscall on the host -- there is no good
513 // in adding extra buffering here.
514 let res = io::stdout().write(buf_cont);
515 io::stdout().flush().unwrap();
518 // No need to flush, stderr is not buffered.
519 io::stderr().write(buf_cont)
526 eprintln!("Miri: Ignored output to FD {}", fd);
527 // Pretend it all went well.
530 // Now, `result` is the value we return back to the program.
532 Scalar::from_int(result, dest.layout.size),
538 let ptr = this.read_scalar(args[0])?.not_undef()?;
539 let n = this.memory().read_c_str(ptr)?.len();
540 this.write_scalar(Scalar::from_uint(n as u64, dest.layout.size), dest)?;
545 "cbrtf" | "coshf" | "sinhf" |"tanf" => {
546 // FIXME: Using host floats.
547 let f = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
548 let f = match link_name {
555 this.write_scalar(Scalar::from_u32(f.to_bits()), dest)?;
557 // underscore case for windows
558 "_hypotf" | "hypotf" | "atan2f" => {
559 // FIXME: Using host floats.
560 let f1 = f32::from_bits(this.read_scalar(args[0])?.to_u32()?);
561 let f2 = f32::from_bits(this.read_scalar(args[1])?.to_u32()?);
562 let n = match link_name {
563 "_hypotf" | "hypotf" => f1.hypot(f2),
564 "atan2f" => f1.atan2(f2),
567 this.write_scalar(Scalar::from_u32(n.to_bits()), dest)?;
570 "cbrt" | "cosh" | "sinh" | "tan" => {
571 // FIXME: Using host floats.
572 let f = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
573 let f = match link_name {
580 this.write_scalar(Scalar::from_u64(f.to_bits()), dest)?;
582 // underscore case for windows
583 "_hypot" | "hypot" | "atan2" => {
584 // FIXME: Using host floats.
585 let f1 = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
586 let f2 = f64::from_bits(this.read_scalar(args[1])?.to_u64()?);
587 let n = match link_name {
588 "_hypot" | "hypot" => f1.hypot(f2),
589 "atan2" => f1.atan2(f2),
592 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
594 // underscore case for windows
595 "_ldexp" | "ldexp" => {
596 // FIXME: Using host floats.
597 let x = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
598 let exp = this.read_scalar(args[1])?.to_i32()?;
599 // FIXME: We should use cmath if there are any imprecisions.
600 let n = x * 2.0f64.powi(exp);
601 this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
604 // Some things needed for `sys::thread` initialization to go through.
605 "signal" | "sigaction" | "sigaltstack" => {
606 this.write_scalar(Scalar::from_int(0, dest.layout.size), dest)?;
610 let name = this.read_scalar(args[0])?.to_i32()?;
612 trace!("sysconf() called with name {}", name);
613 // TODO: Cache the sysconf integers via Miri's global cache.
615 (&["libc", "_SC_PAGESIZE"], Scalar::from_int(PAGE_SIZE, dest.layout.size)),
616 (&["libc", "_SC_GETPW_R_SIZE_MAX"], Scalar::from_int(-1, dest.layout.size)),
617 (&["libc", "_SC_NPROCESSORS_ONLN"], Scalar::from_int(NUM_CPUS, dest.layout.size)),
619 let mut result = None;
620 for &(path, path_value) in paths {
621 if let Some(val) = this.eval_path_scalar(path)? {
622 let val = val.to_i32()?;
624 result = Some(path_value);
630 if let Some(result) = result {
631 this.write_scalar(result, dest)?;
633 throw_unsup_format!("Unimplemented sysconf name: {}", name)
637 "sched_getaffinity" => {
638 // Return an error; `num_cpus` then falls back to `sysconf`.
639 this.write_scalar(Scalar::from_int(-1, dest.layout.size), dest)?;
643 this.write_null(dest)?;
646 // Hook pthread calls that go to the thread-local storage memory subsystem.
647 "pthread_key_create" => {
648 let key_ptr = this.read_scalar(args[0])?.not_undef()?;
650 // Extract the function type out of the signature (that seems easier than constructing it ourselves).
651 let dtor = match this.test_null(this.read_scalar(args[1])?.not_undef()?)? {
652 Some(dtor_ptr) => Some(this.memory().get_fn(dtor_ptr)?.as_instance()?),
656 // Figure out how large a pthread TLS key actually is.
657 // This is `libc::pthread_key_t`.
658 let key_type = args[0].layout.ty
660 .ok_or_else(|| err_ub!(Ub(format!(
661 "wrong signature used for `pthread_key_create`: first argument must be a raw pointer."
664 let key_layout = this.layout_of(key_type)?;
666 // Create key and write it into the memory where `key_ptr` wants it.
667 let key = this.machine.tls.create_tls_key(dtor) as u128;
668 if key_layout.size.bits() < 128 && key >= (1u128 << key_layout.size.bits() as u128) {
669 throw_unsup!(OutOfTls);
672 let key_ptr = this.memory().check_ptr_access(key_ptr, key_layout.size, key_layout.align.abi)?
673 .expect("cannot be a ZST");
674 this.memory_mut().get_mut(key_ptr.alloc_id)?.write_scalar(
677 Scalar::from_uint(key, key_layout.size).into(),
681 // Return success (`0`).
682 this.write_null(dest)?;
684 "pthread_key_delete" => {
685 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
686 this.machine.tls.delete_tls_key(key)?;
687 // Return success (0)
688 this.write_null(dest)?;
690 "pthread_getspecific" => {
691 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
692 let ptr = this.machine.tls.load_tls(key, tcx)?;
693 this.write_scalar(ptr, dest)?;
695 "pthread_setspecific" => {
696 let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
697 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
698 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
700 // Return success (`0`).
701 this.write_null(dest)?;
704 // Stack size/address stuff.
705 "pthread_attr_init" | "pthread_attr_destroy" | "pthread_self" |
706 "pthread_attr_setstacksize" => {
707 this.write_null(dest)?;
709 "pthread_attr_getstack" => {
710 let addr_place = this.deref_operand(args[1])?;
711 let size_place = this.deref_operand(args[2])?;
714 Scalar::from_uint(STACK_ADDR, addr_place.layout.size),
718 Scalar::from_uint(STACK_SIZE, size_place.layout.size),
722 // Return success (`0`).
723 this.write_null(dest)?;
726 // We don't support threading. (Also for Windows.)
727 "pthread_create" | "CreateThread" => {
728 throw_unsup_format!("Miri does not support threading");
731 // Stub out calls for condvar, mutex and rwlock, to just return `0`.
732 "pthread_mutexattr_init" | "pthread_mutexattr_settype" | "pthread_mutex_init" |
733 "pthread_mutexattr_destroy" | "pthread_mutex_lock" | "pthread_mutex_unlock" |
734 "pthread_mutex_destroy" | "pthread_rwlock_rdlock" | "pthread_rwlock_unlock" |
735 "pthread_rwlock_wrlock" | "pthread_rwlock_destroy" | "pthread_condattr_init" |
736 "pthread_condattr_setclock" | "pthread_cond_init" | "pthread_condattr_destroy" |
737 "pthread_cond_destroy" => {
738 this.write_null(dest)?;
741 // We don't support fork so we don't have to do anything for atfork.
742 "pthread_atfork" => {
743 this.write_null(dest)?;
747 // 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.
748 let addr = this.read_scalar(args[0])?.not_undef()?;
749 this.write_scalar(addr, dest)?;
752 this.write_null(dest)?;
756 "pthread_attr_get_np" | "pthread_getattr_np" => {
757 this.write_null(dest)?;
759 "pthread_get_stackaddr_np" => {
760 let stack_addr = Scalar::from_uint(STACK_ADDR, dest.layout.size);
761 this.write_scalar(stack_addr, dest)?;
763 "pthread_get_stacksize_np" => {
764 let stack_size = Scalar::from_uint(STACK_SIZE, dest.layout.size);
765 this.write_scalar(stack_size, dest)?;
768 // FIXME: register the destructor.
771 this.write_scalar(Scalar::Ptr(this.machine.argc.unwrap()), dest)?;
774 this.write_scalar(Scalar::Ptr(this.machine.argv.unwrap()), dest)?;
776 "SecRandomCopyBytes" => {
777 let len = this.read_scalar(args[1])?.to_usize(this)?;
778 let ptr = this.read_scalar(args[2])?.not_undef()?;
779 this.gen_random(len as usize, ptr)?;
780 this.write_null(dest)?;
783 // Windows API stubs.
785 // DWORD = ULONG = u32
787 "GetProcessHeap" => {
788 // Just fake a HANDLE
789 this.write_scalar(Scalar::from_int(1, this.pointer_size()), dest)?;
792 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
793 let flags = this.read_scalar(args[1])?.to_u32()?;
794 let size = this.read_scalar(args[2])?.to_usize(this)?;
795 let zero_init = (flags & 0x00000008) != 0; // HEAP_ZERO_MEMORY
796 let res = this.malloc(size, zero_init, MiriMemoryKind::WinHeap);
797 this.write_scalar(res, dest)?;
800 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
801 let _flags = this.read_scalar(args[1])?.to_u32()?;
802 let ptr = this.read_scalar(args[2])?.not_undef()?;
803 this.free(ptr, MiriMemoryKind::WinHeap)?;
804 this.write_scalar(Scalar::from_int(1, Size::from_bytes(4)), dest)?;
807 let _handle = this.read_scalar(args[0])?.to_isize(this)?;
808 let _flags = this.read_scalar(args[1])?.to_u32()?;
809 let ptr = this.read_scalar(args[2])?.not_undef()?;
810 let size = this.read_scalar(args[3])?.to_usize(this)?;
811 let res = this.realloc(ptr, size, MiriMemoryKind::WinHeap)?;
812 this.write_scalar(res, dest)?;
816 let err = this.read_scalar(args[0])?.to_u32()?;
817 this.machine.last_error = err;
820 this.write_scalar(Scalar::from_u32(this.machine.last_error), dest)?;
823 "AddVectoredExceptionHandler" => {
824 // Any non zero value works for the stdlib. This is just used for stack overflows anyway.
825 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
827 "InitializeCriticalSection" |
828 "EnterCriticalSection" |
829 "LeaveCriticalSection" |
830 "DeleteCriticalSection" => {
831 // Nothing to do, not even a return value.
835 "TryEnterCriticalSection" |
836 "GetConsoleScreenBufferInfo" |
837 "SetConsoleTextAttribute" => {
838 // Pretend these do not exist / nothing happened, by returning zero.
839 this.write_null(dest)?;
842 let system_info = this.deref_operand(args[0])?;
843 let system_info_ptr = this.check_mplace_access(system_info, None)?
844 .expect("cannot be a ZST");
845 // Initialize with `0`.
846 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
847 .write_repeat(tcx, system_info_ptr, 0, system_info.layout.size)?;
848 // Set number of processors.
849 let dword_size = Size::from_bytes(4);
850 let offset = 2*dword_size + 3*tcx.pointer_size();
851 this.memory_mut().get_mut(system_info_ptr.alloc_id)?
854 system_info_ptr.offset(offset, tcx)?,
855 Scalar::from_int(NUM_CPUS, dword_size).into(),
861 // This just creates a key; Windows does not natively support TLS destructors.
863 // Create key and return it.
864 let key = this.machine.tls.create_tls_key(None) as u128;
866 // Figure out how large a TLS key actually is. This is `c::DWORD`.
867 if dest.layout.size.bits() < 128
868 && key >= (1u128 << dest.layout.size.bits() as u128) {
869 throw_unsup!(OutOfTls);
871 this.write_scalar(Scalar::from_uint(key, dest.layout.size), dest)?;
874 let key = this.read_scalar(args[0])?.to_u32()? as u128;
875 let ptr = this.machine.tls.load_tls(key, tcx)?;
876 this.write_scalar(ptr, dest)?;
879 let key = this.read_scalar(args[0])?.to_u32()? as u128;
880 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
881 this.machine.tls.store_tls(key, this.test_null(new_ptr)?)?;
883 // Return success (`1`).
884 this.write_scalar(Scalar::from_int(1, dest.layout.size), dest)?;
887 let which = this.read_scalar(args[0])?.to_i32()?;
888 // We just make this the identity function, so we know later in `WriteFile`
890 this.write_scalar(Scalar::from_int(which, this.pointer_size()), dest)?;
893 let handle = this.read_scalar(args[0])?.to_isize(this)?;
894 let buf = this.read_scalar(args[1])?.not_undef()?;
895 let n = this.read_scalar(args[2])?.to_u32()?;
896 let written_place = this.deref_operand(args[3])?;
897 // Spec says to always write `0` first.
898 this.write_null(written_place.into())?;
899 let written = if handle == -11 || handle == -12 {
901 use std::io::{self, Write};
903 let buf_cont = this.memory().read_bytes(buf, Size::from_bytes(u64::from(n)))?;
904 let res = if handle == -11 {
905 io::stdout().write(buf_cont)
907 io::stderr().write(buf_cont)
909 res.ok().map(|n| n as u32)
911 eprintln!("Miri: Ignored output to handle {}", handle);
912 // Pretend it all went well.
915 // If there was no error, write back how much was written.
916 if let Some(n) = written {
917 this.write_scalar(Scalar::from_u32(n), written_place.into())?;
919 // Return whether this was a success.
921 Scalar::from_int(if written.is_some() { 1 } else { 0 }, dest.layout.size),
925 "GetConsoleMode" => {
926 // Everything is a pipe.
927 this.write_null(dest)?;
929 "GetEnvironmentVariableW" => {
930 // This is not the env var you are looking for.
931 this.machine.last_error = 203; // ERROR_ENVVAR_NOT_FOUND
932 this.write_null(dest)?;
934 "GetCommandLineW" => {
935 this.write_scalar(Scalar::Ptr(this.machine.cmd_line.unwrap()), dest)?;
937 // The actual name of 'RtlGenRandom'
938 "SystemFunction036" => {
939 let ptr = this.read_scalar(args[0])?.not_undef()?;
940 let len = this.read_scalar(args[1])?.to_u32()?;
941 this.gen_random(len as usize, ptr)?;
942 this.write_scalar(Scalar::from_bool(true), dest)?;
945 // We can't execute anything else.
947 throw_unsup_format!("can't call foreign function: {}", link_name)
951 this.goto_block(Some(ret))?;
952 this.dump_place(*dest);
956 /// Evaluates the scalar at the specified path. Returns Some(val)
957 /// if the path could be resolved, and None otherwise
958 fn eval_path_scalar(&mut self, path: &[&str]) -> InterpResult<'tcx, Option<ScalarMaybeUndef<Tag>>> {
959 let this = self.eval_context_mut();
960 if let Ok(instance) = this.resolve_path(path) {
965 let const_val = this.const_eval_raw(cid)?;
966 let const_val = this.read_scalar(const_val.into())?;
967 return Ok(Some(const_val));