-use std::{mem, iter};
-use std::ffi::{OsStr, OsString};
+use std::convert::{TryFrom, TryInto};
+use std::mem;
+use std::num::NonZeroUsize;
+use std::time::Duration;
-use rustc::hir::def_id::{DefId, CRATE_DEF_INDEX};
-use rustc::mir;
-use rustc::ty::{
- self,
- layout::{self, LayoutOf, Size, TyLayout},
-};
+use log::trace;
+
+use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX};
+use rustc_middle::mir;
+use rustc_middle::ty::{self, layout::TyAndLayout, List, TyCtxt};
+use rustc_target::abi::{Align, FieldsShape, LayoutOf, Size, Variants};
+use rustc_target::spec::abi::Abi;
use rand::RngCore;
use crate::*;
-impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
-
-pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
- /// Gets an instance for a path.
- fn resolve_path(&self, path: &[&str]) -> InterpResult<'tcx, ty::Instance<'tcx>> {
- let this = self.eval_context_ref();
- this.tcx
- .crates()
- .iter()
- .find(|&&krate| this.tcx.original_crate_name(krate).as_str() == path[0])
- .and_then(|krate| {
- let krate = DefId {
- krate: *krate,
- index: CRATE_DEF_INDEX,
- };
- let mut items = this.tcx.item_children(krate);
- let mut path_it = path.iter().skip(1).peekable();
-
- while let Some(segment) = path_it.next() {
- for item in mem::replace(&mut items, Default::default()).iter() {
- if item.ident.name.as_str() == *segment {
- if path_it.peek().is_none() {
- return Some(ty::Instance::mono(this.tcx.tcx, item.res.def_id()));
- }
-
- items = this.tcx.item_children(item.res.def_id());
- break;
+impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
+
+/// Gets an instance for a path.
+fn try_resolve_did<'mir, 'tcx>(tcx: TyCtxt<'tcx>, path: &[&str]) -> Option<DefId> {
+ tcx.crates().iter().find(|&&krate| tcx.crate_name(krate).as_str() == path[0]).and_then(
+ |krate| {
+ let krate = DefId { krate: *krate, index: CRATE_DEF_INDEX };
+ let mut items = tcx.item_children(krate);
+ let mut path_it = path.iter().skip(1).peekable();
+
+ while let Some(segment) = path_it.next() {
+ for item in mem::replace(&mut items, Default::default()).iter() {
+ if item.ident.name.as_str() == *segment {
+ if path_it.peek().is_none() {
+ return Some(item.res.def_id());
}
+
+ items = tcx.item_children(item.res.def_id());
+ break;
}
}
- None
- })
- .ok_or_else(|| {
- let path = path.iter().map(|&s| s.to_owned()).collect();
- err_unsup!(PathNotFound(path)).into()
- })
+ }
+ None
+ },
+ )
+}
+
+pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
+ /// Gets an instance for a path.
+ fn resolve_path(&self, path: &[&str]) -> ty::Instance<'tcx> {
+ let did = try_resolve_did(self.eval_context_ref().tcx.tcx, path)
+ .unwrap_or_else(|| panic!("failed to find required Rust item: {:?}", path));
+ ty::Instance::mono(self.eval_context_ref().tcx.tcx, did)
+ }
+
+ /// Evaluates the scalar at the specified path. Returns Some(val)
+ /// if the path could be resolved, and None otherwise
+ fn eval_path_scalar(&mut self, path: &[&str]) -> InterpResult<'tcx, ScalarMaybeUninit<Tag>> {
+ let this = self.eval_context_mut();
+ let instance = this.resolve_path(path);
+ let cid = GlobalId { instance, promoted: None };
+ let const_val = this.eval_to_allocation(cid)?;
+ let const_val = this.read_scalar(&const_val.into())?;
+ return Ok(const_val);
+ }
+
+ /// Helper function to get a `libc` constant as a `Scalar`.
+ fn eval_libc(&mut self, name: &str) -> InterpResult<'tcx, Scalar<Tag>> {
+ self.eval_context_mut().eval_path_scalar(&["libc", name])?.check_init()
+ }
+
+ /// Helper function to get a `libc` constant as an `i32`.
+ fn eval_libc_i32(&mut self, name: &str) -> InterpResult<'tcx, i32> {
+ // TODO: Cache the result.
+ self.eval_libc(name)?.to_i32()
+ }
+
+ /// Helper function to get a `windows` constant as a `Scalar`.
+ fn eval_windows(&mut self, module: &str, name: &str) -> InterpResult<'tcx, Scalar<Tag>> {
+ self.eval_context_mut()
+ .eval_path_scalar(&["std", "sys", "windows", module, name])?
+ .check_init()
+ }
+
+ /// Helper function to get a `windows` constant as an `u64`.
+ fn eval_windows_u64(&mut self, module: &str, name: &str) -> InterpResult<'tcx, u64> {
+ // TODO: Cache the result.
+ self.eval_windows(module, name)?.to_u64()
+ }
+
+ /// Helper function to get the `TyAndLayout` of a `libc` type
+ fn libc_ty_layout(&mut self, name: &str) -> InterpResult<'tcx, TyAndLayout<'tcx>> {
+ let this = self.eval_context_mut();
+ let ty = this.resolve_path(&["libc", name]).ty(*this.tcx, ty::ParamEnv::reveal_all());
+ this.layout_of(ty)
+ }
+
+ /// Helper function to get the `TyAndLayout` of a `windows` type
+ fn windows_ty_layout(&mut self, name: &str) -> InterpResult<'tcx, TyAndLayout<'tcx>> {
+ let this = self.eval_context_mut();
+ let ty = this
+ .resolve_path(&["std", "sys", "windows", "c", name])
+ .ty(*this.tcx, ty::ParamEnv::reveal_all());
+ this.layout_of(ty)
}
/// Write a 0 of the appropriate size to `dest`.
- fn write_null(&mut self, dest: PlaceTy<'tcx, Tag>) -> InterpResult<'tcx> {
+ fn write_null(&mut self, dest: &PlaceTy<'tcx, Tag>) -> InterpResult<'tcx> {
self.eval_context_mut().write_scalar(Scalar::from_int(0, dest.layout.size), dest)
}
/// Test if this immediate equals 0.
fn is_null(&self, val: Scalar<Tag>) -> InterpResult<'tcx, bool> {
let this = self.eval_context_ref();
- let null = Scalar::from_int(0, this.memory.pointer_size());
+ let null = Scalar::null_ptr(this);
this.ptr_eq(val, null)
}
/// Turn a Scalar into an Option<NonNullScalar>
fn test_null(&self, val: Scalar<Tag>) -> InterpResult<'tcx, Option<Scalar<Tag>>> {
let this = self.eval_context_ref();
- Ok(if this.is_null(val)? {
- None
- } else {
- Some(val)
- })
+ Ok(if this.is_null(val)? { None } else { Some(val) })
}
/// Get the `Place` for a local
fn local_place(&mut self, local: mir::Local) -> InterpResult<'tcx, PlaceTy<'tcx, Tag>> {
let this = self.eval_context_mut();
- let place = mir::Place { base: mir::PlaceBase::Local(local), projection: Box::new([]) };
- this.eval_place(&place)
+ let place = mir::Place { local: local, projection: List::empty() };
+ this.eval_place(place)
}
/// Generate some random bytes, and write them to `dest`.
- fn gen_random(
- &mut self,
- ptr: Scalar<Tag>,
- len: usize,
- ) -> InterpResult<'tcx> {
+ fn gen_random(&mut self, ptr: Scalar<Tag>, len: u64) -> InterpResult<'tcx> {
// Some programs pass in a null pointer and a length of 0
// to their platform's random-generation function (e.g. getrandom())
// on Linux. For compatibility with these programs, we don't perform
}
let this = self.eval_context_mut();
- let mut data = vec![0; len];
+ let mut data = vec![0; usize::try_from(len).unwrap()];
if this.machine.communicate {
// Fill the buffer using the host's rng.
getrandom::getrandom(&mut data)
- .map_err(|err| err_unsup_format!("getrandom failed: {}", err))?;
- }
- else {
+ .map_err(|err| err_unsup_format!("host getrandom failed: {}", err))?;
+ } else {
let rng = this.memory.extra.rng.get_mut();
rng.fill_bytes(&mut data);
}
this.memory.write_bytes(ptr, data.iter().copied())
}
+ /// Call a function: Push the stack frame and pass the arguments.
+ /// For now, arguments must be scalars (so that the caller does not have to know the layout).
+ fn call_function(
+ &mut self,
+ f: ty::Instance<'tcx>,
+ caller_abi: Abi,
+ args: &[Immediate<Tag>],
+ dest: Option<&PlaceTy<'tcx, Tag>>,
+ stack_pop: StackPopCleanup,
+ ) -> InterpResult<'tcx> {
+ let this = self.eval_context_mut();
+ let param_env = ty::ParamEnv::reveal_all(); // in Miri this is always the param_env we use... and this.param_env is private.
+ let callee_abi = f.ty(*this.tcx, param_env).fn_sig(*this.tcx).abi();
+ if this.machine.enforce_abi && callee_abi != caller_abi {
+ throw_ub_format!(
+ "calling a function with ABI {} using caller ABI {}",
+ callee_abi.name(),
+ caller_abi.name()
+ )
+ }
+
+ // Push frame.
+ let mir = &*this.load_mir(f.def, None)?;
+ this.push_stack_frame(f, mir, dest, stack_pop)?;
+
+ // Initialize arguments.
+ let mut callee_args = this.frame().body.args_iter();
+ for arg in args {
+ let callee_arg = this.local_place(
+ callee_args
+ .next()
+ .ok_or_else(|| err_ub_format!("callee has fewer arguments than expected"))?,
+ )?;
+ this.write_immediate(*arg, &callee_arg)?;
+ }
+ if callee_args.next().is_some() {
+ throw_ub_format!("callee has more arguments than expected");
+ }
+
+ Ok(())
+ }
+
/// Visits the memory covered by `place`, sensitive to freezing: the 3rd parameter
/// will be true if this is frozen, false if this is in an `UnsafeCell`.
fn visit_freeze_sensitive(
&self,
- place: MPlaceTy<'tcx, Tag>,
+ place: &MPlaceTy<'tcx, Tag>,
size: Size,
mut action: impl FnMut(Pointer<Tag>, Size, bool) -> InterpResult<'tcx>,
) -> InterpResult<'tcx> {
let this = self.eval_context_ref();
trace!("visit_frozen(place={:?}, size={:?})", *place, size);
- debug_assert_eq!(size,
+ debug_assert_eq!(
+ size,
this.size_and_align_of_mplace(place)?
- .map(|(size, _)| size)
- .unwrap_or_else(|| place.layout.size)
+ .map(|(size, _)| size)
+ .unwrap_or_else(|| place.layout.size)
);
// Store how far we proceeded into the place so far. Everything to the left of
// this offset has already been handled, in the sense that the frozen parts
let frozen_size = unsafe_cell_offset - end_offset;
// Everything between the end_ptr and this `UnsafeCell` is frozen.
if frozen_size != Size::ZERO {
- action(end_ptr, frozen_size, /*frozen*/true)?;
+ action(end_ptr, frozen_size, /*frozen*/ true)?;
}
// This `UnsafeCell` is NOT frozen.
if unsafe_cell_size != Size::ZERO {
- action(unsafe_cell_ptr, unsafe_cell_size, /*frozen*/false)?;
+ action(unsafe_cell_ptr, unsafe_cell_size, /*frozen*/ false)?;
}
// Update end end_ptr.
end_ptr = unsafe_cell_ptr.wrapping_offset(unsafe_cell_size, this);
unsafe_cell_action: |place| {
trace!("unsafe_cell_action on {:?}", place.ptr);
// We need a size to go on.
- let unsafe_cell_size = this.size_and_align_of_mplace(place)?
+ let unsafe_cell_size = this
+ .size_and_align_of_mplace(&place)?
.map(|(size, _)| size)
// for extern types, just cover what we can
.unwrap_or_else(|| place.layout.size);
/// Visiting the memory covered by a `MemPlace`, being aware of
/// whether we are inside an `UnsafeCell` or not.
struct UnsafeCellVisitor<'ecx, 'mir, 'tcx, F>
- where F: FnMut(MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx>
+ where
+ F: FnMut(&MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx>,
{
ecx: &'ecx MiriEvalContext<'mir, 'tcx>,
unsafe_cell_action: F,
}
- impl<'ecx, 'mir, 'tcx, F>
- ValueVisitor<'mir, 'tcx, Evaluator<'tcx>>
- for
- UnsafeCellVisitor<'ecx, 'mir, 'tcx, F>
+ impl<'ecx, 'mir, 'tcx: 'mir, F> ValueVisitor<'mir, 'tcx, Evaluator<'mir, 'tcx>>
+ for UnsafeCellVisitor<'ecx, 'mir, 'tcx, F>
where
- F: FnMut(MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx>
+ F: FnMut(&MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx>,
{
type V = MPlaceTy<'tcx, Tag>;
}
// Hook to detect `UnsafeCell`.
- fn visit_value(&mut self, v: MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx>
- {
+ fn visit_value(&mut self, v: &MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx> {
trace!("UnsafeCellVisitor: {:?} {:?}", *v, v.layout.ty);
- let is_unsafe_cell = match v.layout.ty.kind {
- ty::Adt(adt, _) => Some(adt.did) == self.ecx.tcx.lang_items().unsafe_cell_type(),
+ let is_unsafe_cell = match v.layout.ty.kind() {
+ ty::Adt(adt, _) =>
+ Some(adt.did) == self.ecx.tcx.lang_items().unsafe_cell_type(),
_ => false,
};
if is_unsafe_cell {
} else if self.ecx.type_is_freeze(v.layout.ty) {
// This is `Freeze`, there cannot be an `UnsafeCell`
Ok(())
+ } else if matches!(v.layout.fields, FieldsShape::Union(..)) {
+ // A (non-frozen) union. We fall back to whatever the type says.
+ (self.unsafe_cell_action)(v)
} else {
// We want to not actually read from memory for this visit. So, before
// walking this value, we have to make sure it is not a
// `Variants::Multiple`.
match v.layout.variants {
- layout::Variants::Multiple { .. } => {
+ Variants::Multiple { .. } => {
// A multi-variant enum, or generator, or so.
// Treat this like a union: without reading from memory,
// we cannot determine the variant we are in. Reading from
// `UnsafeCell` action.
(self.unsafe_cell_action)(v)
}
- layout::Variants::Single { .. } => {
+ Variants::Single { .. } => {
// Proceed further, try to find where exactly that `UnsafeCell`
// is hiding.
self.walk_value(v)
// Make sure we visit aggregrates in increasing offset order.
fn visit_aggregate(
&mut self,
- place: MPlaceTy<'tcx, Tag>,
- fields: impl Iterator<Item=InterpResult<'tcx, MPlaceTy<'tcx, Tag>>>,
+ place: &MPlaceTy<'tcx, Tag>,
+ fields: impl Iterator<Item = InterpResult<'tcx, MPlaceTy<'tcx, Tag>>>,
) -> InterpResult<'tcx> {
match place.layout.fields {
- layout::FieldPlacement::Array { .. } => {
+ FieldsShape::Array { .. } => {
// For the array layout, we know the iterator will yield sorted elements so
// we can avoid the allocation.
self.walk_aggregate(place, fields)
}
- layout::FieldPlacement::Arbitrary { .. } => {
+ FieldsShape::Arbitrary { .. } => {
// Gather the subplaces and sort them before visiting.
- let mut places = fields.collect::<InterpResult<'tcx, Vec<MPlaceTy<'tcx, Tag>>>>()?;
+ let mut places =
+ fields.collect::<InterpResult<'tcx, Vec<MPlaceTy<'tcx, Tag>>>>()?;
places.sort_by_key(|place| place.ptr.assert_ptr().offset);
self.walk_aggregate(place, places.into_iter().map(Ok))
}
- layout::FieldPlacement::Union { .. } => {
+ FieldsShape::Union { .. } | FieldsShape::Primitive => {
// Uh, what?
- bug!("a union is not an aggregate we should ever visit")
+ bug!("unions/primitives are not aggregates we should ever visit")
}
}
}
- // We have to do *something* for unions.
- fn visit_union(&mut self, v: MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx>
- {
- // With unions, we fall back to whatever the type says, to hopefully be consistent
- // with LLVM IR.
- // FIXME: are we consistent, and is this really the behavior we want?
- let frozen = self.ecx.type_is_freeze(v.layout.ty);
- if frozen {
- Ok(())
- } else {
- (self.unsafe_cell_action)(v)
- }
- }
-
- // We should never get to a primitive, but always short-circuit somewhere above.
- fn visit_primitive(&mut self, _v: MPlaceTy<'tcx, Tag>) -> InterpResult<'tcx>
- {
- bug!("we should always short-circuit before coming to a primitive")
+ fn visit_union(
+ &mut self,
+ _v: &MPlaceTy<'tcx, Tag>,
+ _fields: NonZeroUsize,
+ ) -> InterpResult<'tcx> {
+ bug!("we should have already handled unions in `visit_value`")
}
}
}
- /// Helper function to get a `libc` constant as a `Scalar`.
- fn eval_libc(&mut self, name: &str) -> InterpResult<'tcx, Scalar<Tag>> {
- self.eval_context_mut()
- .eval_path_scalar(&["libc", name])?
- .ok_or_else(|| err_unsup_format!("Path libc::{} cannot be resolved.", name))?
- .not_undef()
- }
-
- /// Helper function to get a `libc` constant as an `i32`.
- fn eval_libc_i32(&mut self, name: &str) -> InterpResult<'tcx, i32> {
- self.eval_libc(name)?.to_i32()
- }
-
- /// Helper function to get the `TyLayout` of a `libc` type
- fn libc_ty_layout(&mut self, name: &str) -> InterpResult<'tcx, TyLayout<'tcx>> {
- let this = self.eval_context_mut();
- let ty = this.resolve_path(&["libc", name])?.ty(*this.tcx);
- this.layout_of(ty)
- }
-
- // Writes several `ImmTy`s contiguosly into memory. This is useful when you have to pack
+ // Writes several `ImmTy`s contiguously into memory. This is useful when you have to pack
// different values into a struct.
fn write_packed_immediates(
&mut self,
for &imm in imms {
this.write_immediate_to_mplace(
*imm,
- place.offset(offset, None, imm.layout, &*this.tcx)?,
+ &place.offset(offset, MemPlaceMeta::None, imm.layout, &*this.tcx)?,
)?;
offset += imm.layout.size;
}
/// Helper function used inside the shims of foreign functions to check that isolation is
/// disabled. It returns an error using the `name` of the foreign function if this is not the
/// case.
- fn check_no_isolation(&mut self, name: &str) -> InterpResult<'tcx> {
- if !self.eval_context_mut().machine.communicate {
- throw_unsup_format!("`{}` not available when isolation is enabled. Pass the flag `-Zmiri-disable-isolation` to disable it.", name)
+ fn check_no_isolation(&self, name: &str) -> InterpResult<'tcx> {
+ if !self.eval_context_ref().machine.communicate {
+ isolation_error(name)?;
}
Ok(())
}
+ /// Helper function used inside the shims of foreign functions to assert that the target OS
+ /// is `target_os`. It panics showing a message with the `name` of the foreign function
+ /// if this is not the case.
+ fn assert_target_os(&self, target_os: &str, name: &str) {
+ assert_eq!(
+ self.eval_context_ref().tcx.sess.target.os,
+ target_os,
+ "`{}` is only available on the `{}` target OS",
+ name,
+ target_os,
+ )
+ }
+
+ /// Get last error variable as a place, lazily allocating thread-local storage for it if
+ /// necessary.
+ fn last_error_place(&mut self) -> InterpResult<'tcx, MPlaceTy<'tcx, Tag>> {
+ let this = self.eval_context_mut();
+ if let Some(errno_place) = this.active_thread_ref().last_error {
+ Ok(errno_place)
+ } else {
+ // Allocate new place, set initial value to 0.
+ let errno_layout = this.machine.layouts.u32;
+ let errno_place = this.allocate(errno_layout, MiriMemoryKind::Machine.into());
+ this.write_scalar(Scalar::from_u32(0), &errno_place.into())?;
+ this.active_thread_mut().last_error = Some(errno_place);
+ Ok(errno_place)
+ }
+ }
+
/// Sets the last error variable.
fn set_last_error(&mut self, scalar: Scalar<Tag>) -> InterpResult<'tcx> {
let this = self.eval_context_mut();
- let errno_place = this.machine.last_error.unwrap();
- this.write_scalar(scalar, errno_place.into())
+ let errno_place = this.last_error_place()?;
+ this.write_scalar(scalar, &errno_place.into())
}
/// Gets the last error variable.
fn get_last_error(&mut self) -> InterpResult<'tcx, Scalar<Tag>> {
let this = self.eval_context_mut();
- let errno_place = this.machine.last_error.unwrap();
- this.read_scalar(errno_place.into())?.not_undef()
+ let errno_place = this.last_error_place()?;
+ this.read_scalar(&errno_place.into())?.check_init()
}
/// Sets the last OS error using a `std::io::Error`. This function tries to produce the most
fn set_last_error_from_io_error(&mut self, e: std::io::Error) -> InterpResult<'tcx> {
use std::io::ErrorKind::*;
let this = self.eval_context_mut();
- let target = &this.tcx.tcx.sess.target.target;
- let last_error = if target.options.target_family == Some("unix".to_owned()) {
+ let target = &this.tcx.sess.target;
+ let target_os = &target.os;
+ let last_error = if target.families.contains(&"unix".to_owned()) {
this.eval_libc(match e.kind() {
ConnectionRefused => "ECONNREFUSED",
ConnectionReset => "ECONNRESET",
TimedOut => "ETIMEDOUT",
AlreadyExists => "EEXIST",
WouldBlock => "EWOULDBLOCK",
- _ => throw_unsup_format!("The {} error cannot be transformed into a raw os error", e)
+ _ => {
+ throw_unsup_format!("io error {} cannot be transformed into a raw os error", e)
+ }
})?
+ } else if target.families.contains(&"windows".to_owned()) {
+ // FIXME: we have to finish implementing the Windows equivalent of this.
+ this.eval_windows(
+ "c",
+ match e.kind() {
+ NotFound => "ERROR_FILE_NOT_FOUND",
+ _ => throw_unsup_format!(
+ "io error {} cannot be transformed into a raw os error",
+ e
+ ),
+ },
+ )?
} else {
- // FIXME: we have to implement the Windows equivalent of this.
- throw_unsup_format!("Setting the last OS error from an io::Error is unsupported for {}.", target.target_os)
+ throw_unsup_format!(
+ "setting the last OS error from an io::Error is unsupported for {}.",
+ target_os
+ )
};
this.set_last_error(last_error)
}
}
}
- /// Helper function to read an OsString from a null-terminated sequence of bytes, which is what
- /// the Unix APIs usually handle.
- fn read_os_string_from_c_string(&mut self, scalar: Scalar<Tag>) -> InterpResult<'tcx, OsString> {
- let bytes = self.eval_context_mut().memory.read_c_str(scalar)?;
- Ok(bytes_to_os_str(bytes)?.into())
+ fn read_scalar_at_offset(
+ &self,
+ op: &OpTy<'tcx, Tag>,
+ offset: u64,
+ layout: TyAndLayout<'tcx>,
+ ) -> InterpResult<'tcx, ScalarMaybeUninit<Tag>> {
+ let this = self.eval_context_ref();
+ let op_place = this.deref_operand(op)?;
+ let offset = Size::from_bytes(offset);
+ // Ensure that the following read at an offset is within bounds
+ assert!(op_place.layout.size >= offset + layout.size);
+ let value_place = op_place.offset(offset, MemPlaceMeta::None, layout, this)?;
+ this.read_scalar(&value_place.into())
+ }
+
+ fn write_scalar_at_offset(
+ &mut self,
+ op: &OpTy<'tcx, Tag>,
+ offset: u64,
+ value: impl Into<ScalarMaybeUninit<Tag>>,
+ layout: TyAndLayout<'tcx>,
+ ) -> InterpResult<'tcx, ()> {
+ let this = self.eval_context_mut();
+ let op_place = this.deref_operand(op)?;
+ let offset = Size::from_bytes(offset);
+ // Ensure that the following read at an offset is within bounds
+ assert!(op_place.layout.size >= offset + layout.size);
+ let value_place = op_place.offset(offset, MemPlaceMeta::None, layout, this)?;
+ this.write_scalar(value, &value_place.into())
}
- /// Helper function to write an OsStr as a null-terminated sequence of bytes, which is what
- /// the Unix APIs usually handle. This function returns `Ok(false)` without trying to write if
- /// `size` is not large enough to fit the contents of `os_string` plus a null terminator. It
- /// returns `Ok(true)` if the writing process was successful.
- fn write_os_str_to_c_string(
+ /// Parse a `timespec` struct and return it as a `std::time::Duration`. It returns `None`
+ /// if the value in the `timespec` struct is invalid. Some libc functions will return
+ /// `EINVAL` in this case.
+ fn read_timespec(
&mut self,
- os_str: &OsStr,
- scalar: Scalar<Tag>,
- size: u64
- ) -> InterpResult<'tcx, bool> {
- let bytes = os_str_to_bytes(os_str)?;
- // If `size` is smaller or equal than `bytes.len()`, writing `bytes` plus the required null
- // terminator to memory using the `ptr` pointer would cause an out-of-bounds access.
- if size <= bytes.len() as u64 {
- return Ok(false);
+ timespec_ptr_op: &OpTy<'tcx, Tag>,
+ ) -> InterpResult<'tcx, Option<Duration>> {
+ let this = self.eval_context_mut();
+ let tp = this.deref_operand(timespec_ptr_op)?;
+ let seconds_place = this.mplace_field(&tp, 0)?;
+ let seconds_scalar = this.read_scalar(&seconds_place.into())?;
+ let seconds = seconds_scalar.to_machine_isize(this)?;
+ let nanoseconds_place = this.mplace_field(&tp, 1)?;
+ let nanoseconds_scalar = this.read_scalar(&nanoseconds_place.into())?;
+ let nanoseconds = nanoseconds_scalar.to_machine_isize(this)?;
+
+ Ok(try {
+ // tv_sec must be non-negative.
+ let seconds: u64 = seconds.try_into().ok()?;
+ // tv_nsec must be non-negative.
+ let nanoseconds: u32 = nanoseconds.try_into().ok()?;
+ if nanoseconds >= 1_000_000_000 {
+ // tv_nsec must not be greater than 999,999,999.
+ None?
+ }
+ Duration::new(seconds, nanoseconds)
+ })
+ }
+
+ fn read_c_str<'a>(&'a self, sptr: Scalar<Tag>) -> InterpResult<'tcx, &'a [u8]>
+ where
+ 'tcx: 'a,
+ 'mir: 'a,
+ {
+ let this = self.eval_context_ref();
+ let size1 = Size::from_bytes(1);
+ let ptr = this.force_ptr(sptr)?; // We need to read at least 1 byte, so we can eagerly get a ptr.
+
+ // Step 1: determine the length.
+ let mut len = Size::ZERO;
+ loop {
+ // FIXME: We are re-getting the allocation each time around the loop.
+ // Would be nice if we could somehow "extend" an existing AllocRange.
+ let alloc = this.memory.get(ptr.offset(len, this)?.into(), size1, Align::ONE)?.unwrap(); // not a ZST, so we will get a result
+ let byte = alloc.read_scalar(alloc_range(Size::ZERO, size1))?.to_u8()?;
+ if byte == 0 {
+ break;
+ } else {
+ len = len + size1;
+ }
}
- self.eval_context_mut().memory.write_bytes(scalar, bytes.iter().copied().chain(iter::once(0u8)))?;
- Ok(true)
+
+ // Step 2: get the bytes.
+ this.memory.read_bytes(ptr.into(), len)
+ }
+
+ fn read_wide_str(&self, sptr: Scalar<Tag>) -> InterpResult<'tcx, Vec<u16>> {
+ let this = self.eval_context_ref();
+ let size2 = Size::from_bytes(2);
+ let align2 = Align::from_bytes(2).unwrap();
+
+ let mut ptr = this.force_ptr(sptr)?; // We need to read at least 1 wchar, so we can eagerly get a ptr.
+ let mut wchars = Vec::new();
+ loop {
+ // FIXME: We are re-getting the allocation each time around the loop.
+ // Would be nice if we could somehow "extend" an existing AllocRange.
+ let alloc = this.memory.get(ptr.into(), size2, align2)?.unwrap(); // not a ZST, so we will get a result
+ let wchar = alloc.read_scalar(alloc_range(Size::ZERO, size2))?.to_u16()?;
+ if wchar == 0 {
+ break;
+ } else {
+ wchars.push(wchar);
+ ptr = ptr.offset(size2, this)?;
+ }
+ }
+
+ Ok(wchars)
+ }
+
+ /// Check that the ABI is what we expect.
+ fn check_abi<'a>(&self, abi: Abi, exp_abi: Abi) -> InterpResult<'a, ()> {
+ if self.eval_context_ref().machine.enforce_abi && abi != exp_abi {
+ throw_ub_format!(
+ "calling a function with ABI {} using caller ABI {}",
+ exp_abi.name(),
+ abi.name()
+ )
+ }
+ Ok(())
+ }
+
+ fn in_std(&self) -> bool {
+ let this = self.eval_context_ref();
+ this.tcx.def_path(this.frame().instance.def_id()).krate
+ == this.tcx.def_path(this.tcx.lang_items().start_fn().unwrap()).krate
}
}
-#[cfg(target_os = "unix")]
-fn os_str_to_bytes<'tcx, 'a>(os_str: &'a OsStr) -> InterpResult<'tcx, &'a [u8]> {
- std::os::unix::ffi::OsStringExt::into_bytes(os_str)
+/// Check that the number of args is what we expect.
+pub fn check_arg_count<'a, 'tcx, const N: usize>(
+ args: &'a [OpTy<'tcx, Tag>],
+) -> InterpResult<'tcx, &'a [OpTy<'tcx, Tag>; N]>
+where
+ &'a [OpTy<'tcx, Tag>; N]: TryFrom<&'a [OpTy<'tcx, Tag>]>,
+{
+ if let Ok(ops) = args.try_into() {
+ return Ok(ops);
+ }
+ throw_ub_format!("incorrect number of arguments: got {}, expected {}", args.len(), N)
}
-#[cfg(target_os = "unix")]
-fn bytes_to_os_str<'tcx, 'a>(bytes: &'a[u8]) -> InterpResult<'tcx, &'a OsStr> {
- Ok(std::os::unix::ffi::OsStringExt::from_bytes(bytes))
+pub fn isolation_error(name: &str) -> InterpResult<'static> {
+ throw_machine_stop!(TerminationInfo::UnsupportedInIsolation(format!(
+ "{} not available when isolation is enabled",
+ name,
+ )))
}
-// On non-unix platforms the best we can do to transform bytes from/to OS strings is to do the
-// intermediate transformation into strings. Which invalidates non-utf8 paths that are actually
-// valid.
-#[cfg(not(target_os = "unix"))]
-fn os_str_to_bytes<'tcx, 'a>(os_str: &'a OsStr) -> InterpResult<'tcx, &'a [u8]> {
- os_str
- .to_str()
- .map(|s| s.as_bytes())
- .ok_or_else(|| err_unsup_format!("{:?} is not a valid utf-8 string", os_str).into())
+pub fn immty_from_int_checked<'tcx>(
+ int: impl Into<i128>,
+ layout: TyAndLayout<'tcx>,
+) -> InterpResult<'tcx, ImmTy<'tcx, Tag>> {
+ let int = int.into();
+ Ok(ImmTy::try_from_int(int, layout).ok_or_else(|| {
+ err_unsup_format!("signed value {:#x} does not fit in {} bits", int, layout.size.bits())
+ })?)
}
-#[cfg(not(target_os = "unix"))]
-fn bytes_to_os_str<'tcx, 'a>(bytes: &'a[u8]) -> InterpResult<'tcx, &'a OsStr> {
- let s = std::str::from_utf8(bytes)
- .map_err(|_| err_unsup_format!("{:?} is not a valid utf-8 string", bytes))?;
- Ok(&OsStr::new(s))
+pub fn immty_from_uint_checked<'tcx>(
+ int: impl Into<u128>,
+ layout: TyAndLayout<'tcx>,
+) -> InterpResult<'tcx, ImmTy<'tcx, Tag>> {
+ let int = int.into();
+ Ok(ImmTy::try_from_uint(int, layout).ok_or_else(|| {
+ err_unsup_format!("unsigned value {:#x} does not fit in {} bits", int, layout.size.bits())
+ })?)
}
projects / rust.git / blobdiff