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use super::*;
#[repr(C)]
#[derive(Debug, Copy, Clone, StableAbi)]
#[sabi(unsafe_sabi_opaque_fields)]
pub struct TLField {
name: RStr<'static>,
lifetime_indices: LifetimeArrayOrSlice<'static>,
layout: TypeLayoutCtor,
function_range: TLFunctionSlice,
is_function: bool,
field_accessor: FieldAccessor,
}
impl TLField {
pub const fn new(
name: RStr<'static>,
layout: TypeLayoutCtor,
vars: &'static SharedVars,
) -> Self {
Self {
name,
lifetime_indices: LifetimeArrayOrSlice::EMPTY,
layout,
function_range: TLFunctionSlice::empty(vars),
is_function: false,
field_accessor: FieldAccessor::Direct,
}
}
pub fn full_type(&self) -> FmtFullType {
self.layout.get().full_type()
}
pub fn name(&self) -> &'static str {
self.name.as_str()
}
pub fn lifetime_indices(&self) -> LifetimeArrayOrSlice<'static> {
self.lifetime_indices
}
pub fn layout(&self) -> &'static TypeLayout {
self.layout.get()
}
pub fn function_range(&self) -> TLFunctionSlice {
self.function_range
}
pub fn is_function(&self) -> bool {
self.is_function
}
pub fn field_accessor(&self) -> FieldAccessor {
self.field_accessor
}
fn recursive<F, U>(self, f: F) -> U
where
F: FnOnce(usize, TLFieldShallow) -> U,
{
let mut already_recursed = false;
let mut recursion_depth = !0;
let mut visited_nodes = !0;
ALREADY_RECURSED.with(|state| {
let mut state = state.borrow_mut();
recursion_depth = state.recursion_depth;
visited_nodes = state.visited_nodes;
state.recursion_depth += 1;
state.visited_nodes += 1;
already_recursed = state.visited.replace(self.layout.get()).is_some();
});
let _guard = if visited_nodes == 0 {
Some(ResetRecursion)
} else {
None
};
let field = TLFieldShallow::new(self, !already_recursed);
let res = f(recursion_depth, field);
ALREADY_RECURSED.with(|state| {
let mut state = state.borrow_mut();
state.recursion_depth -= 1;
});
res
}
}
impl Eq for TLField {}
impl PartialEq for TLField {
fn eq(&self, other: &Self) -> bool {
self.recursive(|_, this| {
let r = TLFieldShallow::new(*other, this.layout.is_some());
this == r
})
}
}
impl Display for TLField {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let layout = self.layout.get();
let (package, version) = layout.item_info().package_and_version();
writeln!(
f,
"field_name:{name}\n\
type:{ty}\n\
size:{size} align:{align}\n\
package:'{package}' version:'{version}'",
name = self.name,
ty = layout.full_type(),
size = layout.size(),
align = layout.alignment(),
package = package,
version = version,
)?;
if !self.function_range.is_empty() {
writeln!(f, "fn pointer(s):")?;
for func in self.function_range.iter() {
writeln!(f, "{}", func.to_string().left_padder(4))?;
}
}
if !self.lifetime_indices.is_empty() {
writeln!(f, "lifetime indices:{:?}", self.lifetime_indices)?;
}
Ok(())
}
}
struct ResetRecursion;
impl Drop for ResetRecursion {
fn drop(&mut self) {
ALREADY_RECURSED.with(|state| {
let mut state = state.borrow_mut();
state.recursion_depth = 0;
state.visited_nodes = 0;
state.visited.clear();
});
}
}
struct RecursionState {
recursion_depth: usize,
visited_nodes: u64,
visited: HashSet<*const TypeLayout>,
}
thread_local! {
static ALREADY_RECURSED: RefCell<RecursionState> = RefCell::new(RecursionState{
recursion_depth:0,
visited_nodes:0,
visited: HashSet::default(),
});
}
#[derive(Debug, Copy, Clone, PartialEq)]
struct TLFieldShallow {
name: RStr<'static>,
full_type: FmtFullType,
lifetime_indices: LifetimeArrayOrSlice<'static>,
layout: Option<&'static TypeLayout>,
function_range: TLFunctionSlice,
is_function: bool,
field_accessor: FieldAccessor,
}
impl TLFieldShallow {
fn new(field: TLField, include_type_layout: bool) -> Self {
let layout = field.layout.get();
TLFieldShallow {
name: field.name,
lifetime_indices: field.lifetime_indices,
layout: if include_type_layout {
Some(layout)
} else {
None
},
full_type: layout.full_type(),
function_range: field.function_range,
is_function: field.is_function,
field_accessor: field.field_accessor,
}
}
}
abi_stable_shared::declare_comp_tl_field! {
attrs=[
derive(StableAbi),
sabi(unsafe_sabi_opaque_fields),
]
}
impl CompTLField {
pub fn name(&self, strings: &'static str) -> &'static str {
&strings[self.name_start_len().to_range()]
}
pub fn lifetime_indices(
&self,
indices: &'static [LifetimeIndexPair],
) -> LifetimeArrayOrSlice<'static> {
let comp = LifetimeRange::from_u21(self.lifetime_indices_bits());
comp.slicing(indices)
}
pub fn field_accessor(&self, strings: &'static str) -> FieldAccessor {
let name_end = self.name_start_len().end();
let comp = CompFieldAccessor::from_u3((self.bits0 >> Self::FIELD_ACCESSOR_OFFSET) as u8);
let accessor_payload = if comp.requires_payload() {
strings[name_end..].split(';').next().unwrap_or("")
} else {
""
};
comp.expand(accessor_payload)
.unwrap_or(FieldAccessor::Opaque)
}
pub fn type_layout(&self, type_layouts: &'static [TypeLayoutCtor]) -> TypeLayoutCtor {
type_layouts[self.type_layout_index()]
}
pub fn expand(
&self,
field_index: usize,
functions: Option<&'static TLFunctions>,
vars: &'static SharedVars,
) -> TLField {
let strings = vars.strings();
let function_range = TLFunctionSlice::for_field(field_index, functions, vars);
TLField {
name: self.name(strings).into(),
lifetime_indices: self.lifetime_indices(vars.lifetime_indices()),
layout: self.type_layout(vars.type_layouts()),
function_range,
is_function: self.is_function(),
field_accessor: self.field_accessor(strings),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{abi_stability::stable_abi_trait::GetTypeLayoutCtor, std_types::RString};
#[test]
fn roundtrip() {
const UNIT_CTOR: TypeLayoutCtor = GetTypeLayoutCtor::<()>::STABLE_ABI;
const U32_CTOR: TypeLayoutCtor = GetTypeLayoutCtor::<u32>::STABLE_ABI;
const RSTRING_CTOR: TypeLayoutCtor = GetTypeLayoutCtor::<RString>::STABLE_ABI;
const MONO_VARS: &MonoSharedVars = &MonoSharedVars::new(rstr!("foo;bar; baz; "), rslice![]);
const VARS: &SharedVars = &SharedVars::new(
MONO_VARS,
rslice![UNIT_CTOR, U32_CTOR, RSTRING_CTOR],
rslice![],
);
let vars = VARS;
let mut arr = [LifetimeIndex::NONE; 5];
arr[0] = LifetimeIndex::STATIC;
let lifetime_range = LifetimeRange::from_array(arr);
let field = CompTLField::new(
StartLen::new(9, 3),
lifetime_range,
CompFieldAccessor::DIRECT,
TypeLayoutIndex::from_u10(2),
false,
);
assert_eq!(field.name(vars.strings()), "baz",);
assert_eq!(
field.lifetime_indices(vars.lifetime_indices()),
lifetime_range.slicing(vars.lifetime_indices()),
);
assert_eq!(field.type_layout(vars.type_layouts()), RSTRING_CTOR,);
assert_eq!(field.field_accessor(vars.strings()), FieldAccessor::Direct,);
}
}