abi_stable/type_layout/
tl_prefix.rs

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1use super::*;
2
3////////////////////////////////////////////////////////////////////////////////
4
5/// Properties of prefix types
6/// (vtables and modules) that don't change with generic parameters.
7#[repr(C)]
8#[derive(Copy, Clone, StableAbi)]
9pub struct MonoTLPrefixType {
10    /// The first field in the suffix,
11    /// the index to the field after
12    /// the one to which `#[sabi(last_prefix_field)]` was applied to
13    pub first_suffix_field: u8,
14    /// Which fields in the prefix
15    /// (the ones up to the one with the `#[sabi(last_prefix_field)]` attribute)
16    /// are conditionally accessible
17    /// (with the `#[sabi(accessible_if = expression)]` attribute).
18    pub conditional_prefix_fields: FieldConditionality,
19    /// All the fields of the prefix-type,even if they are inaccessible.
20    pub fields: CompTLFields,
21}
22
23impl MonoTLPrefixType {
24    /// Expands this into a `TLPrefixType`.
25    pub const fn expand(
26        self,
27        other: GenericTLPrefixType,
28        shared_vars: &'static SharedVars,
29    ) -> TLPrefixType {
30        TLPrefixType {
31            first_suffix_field: self.first_suffix_field,
32            conditional_prefix_fields: self.conditional_prefix_fields,
33            fields: self.fields.expand(shared_vars),
34            accessible_fields: other.accessible_fields,
35        }
36    }
37}
38
39/////////////////////////////////////////////////////
40
41/// Properties of prefix types
42/// (vtables and modules) that depends on generic parameters.
43#[repr(C)]
44#[derive(Copy, Clone, StableAbi)]
45pub struct GenericTLPrefixType {
46    /// Which fields are accessible when the prefix type is instantiated in
47    /// the same dynlib/binary.
48    pub accessible_fields: FieldAccessibility,
49}
50
51/////////////////////////////////////////////////////
52
53/// Properties of prefix types (vtables and modules),
54/// combining `MonoTLPrefixType` and `GenericTLPrefixType`.
55#[repr(C)]
56#[derive(Debug, Copy, Clone, PartialEq, Eq, StableAbi)]
57pub struct TLPrefixType {
58    /// The first field in the suffix,
59    /// the index to the field after
60    /// the one to which `#[sabi(last_prefix_field)]` was applied to
61    pub first_suffix_field: u8,
62    /// Which fields in the prefix
63    /// (the ones up to the one with the `#[sabi(last_prefix_field)]` attribute)
64    /// are conditionally accessible
65    /// (with the `#[sabi(accessible_if = expression)]` attribute).
66    pub conditional_prefix_fields: FieldConditionality,
67    /// All the fields of the prefix-type,even if they are inaccessible.
68    pub fields: TLFields,
69
70    /// Which fields are accessible when the prefix type is instantiated in
71    /// the same dynlib/binary.
72    pub accessible_fields: FieldAccessibility,
73}
74
75impl Display for TLPrefixType {
76    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
77        writeln!(f, "first_suffix_field:{}", self.first_suffix_field)?;
78        writeln!(
79            f,
80            "conditional_prefix_fields:\n    {:b}",
81            self.conditional_prefix_fields.bits(),
82        )?;
83        writeln!(f, "fields:\n{}", self.fields.to_string().left_padder(4))?;
84        write!(f, "accessible_fields:\n    ")?;
85        f.debug_list()
86            .entries(self.accessible_fields.iter().take(self.fields.len()))
87            .finish()?;
88        Ok(())
89    }
90}
abi_stable/type_layout/tl_prefix.rs

abi_stable/type_layout/
tl_prefix.rs
