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use crate::{Addr, PValue, RValue, RefAddr, RefCountedType};
/// This trait only exists to workaround the orphan rule.
pub trait RValueLift {
/// Lift the type to a higher level, in place
fn lift(&mut self) -> Option<()>;
}
impl RValueLift for RValue {
/// Lift the `RValue` to a higher level. It removes some implementation details of standard library types.
fn lift(&mut self) -> Option<()> {
match self {
Self::Unit => (),
Self::Prim(_) => (),
Self::Bytes { .. } => (),
Self::Ref { value, .. } => {
value.lift();
}
Self::DynRef { .. } | Self::RefCounted { .. } | Self::DynRefCounted { .. } => {
// already lifted
}
Self::UnresolvedRef { .. } => (),
Self::Struct { typename, fields } => {
for value in fields.values_mut() {
value.lift();
}
if typename.starts_with("(") && typename.ends_with(")") {
let mut items = Vec::new();
for (i, (t, item)) in fields.drain(..).enumerate() {
let t: usize = t.parse().ok()?;
if i != t {
return None;
}
items.push(item);
}
*self = Self::Tuple {
typename: std::mem::take(typename),
items,
};
} else if typename.starts_with("core::sync::atomic::Atomic")
|| typename.starts_with("core::cell::Cell<")
{
if fields.len() != 1 {
return None;
}
let mut value = fields.get("value");
if value.is_none() {
value = fields.get("v");
}
let value = value?;
let prim = value.struct_field("value")?.prim()?;
fields.clear();
fields.insert("value".to_owned(), RValue::Prim(prim));
} else if typename.starts_with("&dyn ")
|| typename.starts_with("alloc::boxed::Box<dyn ")
{
if fields.get("pointer").is_some() && fields.get("vtable").is_some() {
let pointer = fields.remove("pointer");
let vtable = fields.remove("vtable");
if let (Some(pointer), Some(vtable)) = (pointer, vtable) {
*self = Self::DynRef {
typename: std::mem::take(typename),
addr: get_addr(&pointer),
vtable: get_addr(&vtable),
value: match pointer {
RValue::Ref { value, .. } => value,
_ => Box::new(RValue::Opaque),
},
};
}
}
} else if typename.starts_with("alloc::sync::Arc<dyn ")
|| typename.starts_with("alloc::rc::Rc<dyn ")
{
if let Some(value) = fields.remove("ptr") {
if let Some(value) = take_struct_field(value, "pointer") {
if let Self::Struct { mut fields, .. } = value {
let pointer = fields.remove("pointer");
let vtable = fields.remove("vtable");
if let (Some(pointer), Some(vtable)) = (pointer, vtable) {
if let Self::Ref { addr, value, .. } = pointer {
let extract = |name: &str| -> Option<u64> {
take_usize(
value
.struct_field(name)?
.struct_field("value")?
.prim()?,
)
};
let strong = extract("strong").unwrap_or_default();
let weak = extract("weak").unwrap_or_default();
let field = if typename.starts_with("alloc::sync::Arc<") {
"data"
} else {
"value"
};
*self = Self::DynRefCounted {
typename: std::mem::take(typename),
addr,
strong,
weak,
vtable: get_addr(&vtable),
value: Box::new(take_struct_field(
unbox(value),
field,
)?),
};
} else {
*self = Self::Struct {
typename: std::mem::take(typename),
fields: Default::default(),
};
}
} else {
*self = Self::Struct {
typename: std::mem::take(typename),
fields: Default::default(),
};
}
} else {
*self = Self::Struct {
typename: std::mem::take(typename),
fields: Default::default(),
};
}
} else {
*self = Self::Struct {
typename: std::mem::take(typename),
fields: Default::default(),
};
}
}
} else if typename.starts_with("alloc::sync::Arc<")
|| typename.starts_with("alloc::rc::Rc<")
{
if let Some(value) = fields.remove("ptr") {
let value = take_struct_field(value, "pointer")?;
if let Self::Ref { addr, value, .. } = value {
let extract = |name: &str| -> Option<u64> {
take_usize(value.struct_field(name)?.struct_field("value")?.prim()?)
};
let strong = extract("strong").unwrap_or_default();
let weak = extract("weak").unwrap_or_default();
let (typename, field) = if typename.starts_with("alloc::sync::Arc<") {
(RefCountedType::Arc, "data")
} else if typename.starts_with("alloc::rc::Rc<") {
(RefCountedType::Rc, "value")
} else {
*self = Self::Struct {
typename: std::mem::take(typename),
fields: Default::default(),
};
return None;
};
*self = Self::RefCounted {
typename,
addr,
strong,
weak,
value: Box::new(
take_struct_field(unbox(value), field).unwrap_or(Self::Opaque),
),
};
} else {
*self = Self::Struct {
typename: std::mem::take(typename),
fields: Default::default(),
};
}
}
}
}
Self::Tuple { .. } => {
// already lifted
}
Self::Enum { .. } => (),
Self::String { .. } => (),
Self::Union {
typeinfo,
variant,
fields,
} => {
for value in fields.values_mut() {
value.lift();
}
if typeinfo.name.starts_with("core::option::Option") {
*self = Self::Option {
typename: typeinfo.name.to_owned(),
variant: std::mem::take(variant),
value: if let Some(field) = fields.remove("0") {
Some(Box::new(field))
} else if fields.contains_key("<>") {
Some(Box::new(Self::Opaque))
} else {
None
},
}
} else if typeinfo.name.starts_with("core::result::Result") {
*self = Self::Result {
typename: typeinfo.name.to_owned(),
variant: std::mem::take(variant),
value: Box::new(fields.remove("0").unwrap_or(Self::Opaque)),
}
}
}
Self::Option { .. } | Self::Result { .. } => {
// already lifted
}
Self::Array { data, .. } => {
for value in data.iter_mut() {
value.lift();
}
}
Self::Opaque => (),
}
Some(())
}
}
fn take_struct_field(value: RValue, field: &str) -> Option<RValue> {
if let RValue::Struct { mut fields, .. } = value {
fields.remove(field)
} else {
None
}
}
fn get_addr(value: &RValue) -> RefAddr {
if let RValue::Ref { addr, .. } = value {
*addr
} else {
RefAddr::Addr(Addr::from(0))
}
}
fn take_usize(value: PValue) -> Option<u64> {
match value {
PValue::usize(value) => Some(value),
_ => None,
}
}
fn unbox<T>(value: Box<T>) -> T {
*value
}