tracked_pointer_tag: Option<PtrId>,
/// The call id to trace
tracked_call_id: Option<CallId>,
+ /// Whether to track raw pointers.
+ track_raw: bool,
}
/// Memory extra state gives us interior mutable access to the global state.
pub type MemoryExtra = Rc<RefCell<GlobalState>>;
/// Utilities for initialization and ID generation
impl GlobalState {
- pub fn new(tracked_pointer_tag: Option<PtrId>, tracked_call_id: Option<CallId>) -> Self {
+ pub fn new(tracked_pointer_tag: Option<PtrId>, tracked_call_id: Option<CallId>, track_raw: bool) -> Self {
GlobalState {
next_ptr_id: NonZeroU64::new(1).unwrap(),
base_ptr_ids: FxHashMap::default(),
active_calls: FxHashSet::default(),
tracked_pointer_tag,
tracked_call_id,
+ track_raw,
}
}
fn new_ptr(&mut self) -> PtrId {
let id = self.next_ptr_id;
+ if Some(id) == self.tracked_pointer_tag {
+ register_diagnostic(NonHaltingDiagnostic::CreatedPointerTag(id));
+ }
self.next_ptr_id = NonZeroU64::new(id.get() + 1).unwrap();
id
}
/// Test if a memory `access` using pointer tagged `tag` is granted.
/// If yes, return the index of the item that granted it.
- fn access(&mut self, access: AccessKind, tag: Tag, global: &GlobalState) -> InterpResult<'tcx> {
+ fn access(&mut self, access: AccessKind, ptr: Pointer<Tag>, global: &GlobalState) -> InterpResult<'tcx> {
// Two main steps: Find granting item, remove incompatible items above.
// Step 1: Find granting item.
- let granting_idx = self.find_granting(access, tag).ok_or_else(|| {
+ let granting_idx = self.find_granting(access, ptr.tag).ok_or_else(|| {
err_sb_ub(format!(
- "no item granting {} to tag {:?} found in borrow stack.",
- access, tag
+ "no item granting {} to tag {:?} at {} found in borrow stack.",
+ access, ptr.tag, ptr.erase_tag(),
))
})?;
let first_incompatible_idx = self.find_first_write_incompatible(granting_idx);
for item in self.borrows.drain(first_incompatible_idx..).rev() {
trace!("access: popping item {:?}", item);
- Stack::check_protector(&item, Some(tag), global)?;
+ Stack::check_protector(&item, Some(ptr.tag), global)?;
}
} else {
// On a read, *disable* all `Unique` above the granting item. This ensures U2 for read accesses.
let item = &mut self.borrows[idx];
if item.perm == Permission::Unique {
trace!("access: disabling item {:?}", item);
- Stack::check_protector(item, Some(tag), global)?;
+ Stack::check_protector(item, Some(ptr.tag), global)?;
item.perm = Permission::Disabled;
}
}
/// Deallocate a location: Like a write access, but also there must be no
/// active protectors at all because we will remove all items.
- fn dealloc(&mut self, tag: Tag, global: &GlobalState) -> InterpResult<'tcx> {
+ fn dealloc(&mut self, ptr: Pointer<Tag>, global: &GlobalState) -> InterpResult<'tcx> {
// Step 1: Find granting item.
- self.find_granting(AccessKind::Write, tag).ok_or_else(|| {
+ self.find_granting(AccessKind::Write, ptr.tag).ok_or_else(|| {
err_sb_ub(format!(
- "no item granting write access for deallocation to tag {:?} found in borrow stack",
- tag,
+ "no item granting write access for deallocation to tag {:?} at {} found in borrow stack",
+ ptr.tag, ptr.erase_tag(),
))
})?;
Ok(())
}
- /// Derived a new pointer from one with the given tag.
+ /// Derive a new pointer from one with the given tag.
/// `weak` controls whether this operation is weak or strong: weak granting does not act as
/// an access, and they add the new item directly on top of the one it is derived
/// from instead of all the way at the top of the stack.
- fn grant(&mut self, derived_from: Tag, new: Item, global: &GlobalState) -> InterpResult<'tcx> {
+ fn grant(&mut self, derived_from: Pointer<Tag>, new: Item, global: &GlobalState) -> InterpResult<'tcx> {
// Figure out which access `perm` corresponds to.
let access =
if new.perm.grants(AccessKind::Write) { AccessKind::Write } else { AccessKind::Read };
// Now we figure out which item grants our parent (`derived_from`) this kind of access.
// We use that to determine where to put the new item.
- let granting_idx = self.find_granting(access, derived_from)
+ let granting_idx = self.find_granting(access, derived_from.tag)
.ok_or_else(|| err_sb_ub(format!(
- "trying to reborrow for {:?}, but parent tag {:?} does not have an appropriate item in the borrow stack",
- new.perm, derived_from,
+ "trying to reborrow for {:?} at {}, but parent tag {:?} does not have an appropriate item in the borrow stack",
+ new.perm, derived_from.erase_tag(), derived_from.tag,
)))?;
// Compute where to put the new item.
&self,
ptr: Pointer<Tag>,
size: Size,
- f: impl Fn(&mut Stack, &GlobalState) -> InterpResult<'tcx>,
+ f: impl Fn(Pointer<Tag>, &mut Stack, &GlobalState) -> InterpResult<'tcx>,
) -> InterpResult<'tcx> {
let global = self.global.borrow();
let mut stacks = self.stacks.borrow_mut();
- for stack in stacks.iter_mut(ptr.offset, size) {
- f(stack, &*global)?;
+ for (offset, stack) in stacks.iter_mut(ptr.offset, size) {
+ let mut cur_ptr = ptr;
+ cur_ptr.offset = offset;
+ f(cur_ptr, stack, &*global)?;
}
Ok(())
}
// The base pointer is not unique, so the base permission is `SharedReadWrite`.
MemoryKind::Machine(MiriMemoryKind::Global | MiriMemoryKind::ExternStatic | MiriMemoryKind::Tls | MiriMemoryKind::Env) =>
(extra.borrow_mut().global_base_ptr(id), Permission::SharedReadWrite),
- // Everything else we handle entirely untagged for now.
- // FIXME: experiment with more precise tracking.
- _ => (Tag::Untagged, Permission::SharedReadWrite),
+ // Everything else we handle like raw pointers for now.
+ _ => {
+ let mut extra = extra.borrow_mut();
+ let tag = if extra.track_raw { Tag::Tagged(extra.new_ptr()) } else { Tag::Untagged };
+ (tag, Permission::SharedReadWrite)
+ }
};
(Stacks::new(size, perm, tag, extra), tag)
}
#[inline(always)]
pub fn memory_read<'tcx>(&self, ptr: Pointer<Tag>, size: Size) -> InterpResult<'tcx> {
trace!("read access with tag {:?}: {:?}, size {}", ptr.tag, ptr.erase_tag(), size.bytes());
- self.for_each(ptr, size, |stack, global| {
- stack.access(AccessKind::Read, ptr.tag, global)?;
- Ok(())
- })
+ self.for_each(ptr, size, |ptr, stack, global| stack.access(AccessKind::Read, ptr, global))
}
#[inline(always)]
pub fn memory_written<'tcx>(&mut self, ptr: Pointer<Tag>, size: Size) -> InterpResult<'tcx> {
trace!("write access with tag {:?}: {:?}, size {}", ptr.tag, ptr.erase_tag(), size.bytes());
- self.for_each(ptr, size, |stack, global| {
- stack.access(AccessKind::Write, ptr.tag, global)?;
- Ok(())
- })
+ self.for_each(ptr, size, |ptr, stack, global| stack.access(AccessKind::Write, ptr, global))
}
#[inline(always)]
size: Size,
) -> InterpResult<'tcx> {
trace!("deallocation with tag {:?}: {:?}, size {}", ptr.tag, ptr.erase_tag(), size.bytes());
- self.for_each(ptr, size, |stack, global| stack.dealloc(ptr.tag, global))
+ self.for_each(ptr, size, |ptr, stack, global| stack.dealloc(ptr, global))
}
}
Permission::SharedReadWrite
};
let item = Item { perm, tag: new_tag, protector };
- stacked_borrows.for_each(cur_ptr, size, |stack, global| {
- stack.grant(cur_ptr.tag, item, global)
+ stacked_borrows.for_each(cur_ptr, size, |cur_ptr, stack, global| {
+ stack.grant(cur_ptr, item, global)
})
});
}
};
let item = Item { perm, tag: new_tag, protector };
- stacked_borrows.for_each(ptr, size, |stack, global| stack.grant(ptr.tag, item, global))
+ stacked_borrows.for_each(ptr, size, |ptr, stack, global| stack.grant(ptr, item, global))
}
/// Retags an indidual pointer, returning the retagged version.
}
// Compute new borrow.
- let new_tag = match kind {
- // Give up tracking for raw pointers.
- // FIXME: Experiment with more precise tracking. Blocked on `&raw`
- // because `Rc::into_raw` currently creates intermediate references,
- // breaking `Rc::from_raw`.
- RefKind::Raw { .. } => Tag::Untagged,
- // All other pointesr are properly tracked.
- _ => Tag::Tagged(
- this.memory.extra.stacked_borrows.as_ref().unwrap().borrow_mut().new_ptr(),
- ),
+ let new_tag = {
+ let mut mem_extra = this.memory.extra.stacked_borrows.as_ref().unwrap().borrow_mut();
+ match kind {
+ // Give up tracking for raw pointers.
+ RefKind::Raw { .. } if !mem_extra.track_raw => Tag::Untagged,
+ // All other pointers are properly tracked.
+ _ => Tag::Tagged(mem_extra.new_ptr()),
+ }
};
// Reborrow.
projects / rust.git / blobdiff