1 files changed, 165 insertions, 0 deletions
diff --git a/third_party/rust/bindgen/callbacks.rs b/third_party/rust/bindgen/callbacks.rs
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+++ b/third_party/rust/bindgen/callbacks.rs
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+//! A public API for more fine-grained customization of bindgen behavior.
+
+pub use crate::ir::analysis::DeriveTrait;
+pub use crate::ir::derive::CanDerive as ImplementsTrait;
+pub use crate::ir::enum_ty::{EnumVariantCustomBehavior, EnumVariantValue};
+pub use crate::ir::int::IntKind;
+use std::fmt;
+
+/// An enum to allow ignoring parsing of macros.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum MacroParsingBehavior {
+    /// Ignore the macro, generating no code for it, or anything that depends on
+    /// it.
+    Ignore,
+    /// The default behavior bindgen would have otherwise.
+    Default,
+}
+
+impl Default for MacroParsingBehavior {
+    fn default() -> Self {
+        MacroParsingBehavior::Default
+    }
+}
+
+/// A trait to allow configuring different kinds of types in different
+/// situations.
+pub trait ParseCallbacks: fmt::Debug {
+    #[cfg(feature = "cli")]
+    #[doc(hidden)]
+    fn cli_args(&self) -> Vec<String> {
+        vec![]
+    }
+
+    /// This function will be run on every macro that is identified.
+    fn will_parse_macro(&self, _name: &str) -> MacroParsingBehavior {
+        MacroParsingBehavior::Default
+    }
+
+    /// This function will run for every extern variable and function. The returned value determines
+    /// the name visible in the bindings.
+    fn generated_name_override(
+        &self,
+        _item_info: ItemInfo<'_>,
+    ) -> Option<String> {
+        None
+    }
+
+    /// The integer kind an integer macro should have, given a name and the
+    /// value of that macro, or `None` if you want the default to be chosen.
+    fn int_macro(&self, _name: &str, _value: i64) -> Option<IntKind> {
+        None
+    }
+
+    /// This will be run on every string macro. The callback cannot influence the further
+    /// treatment of the macro, but may use the value to generate additional code or configuration.
+    fn str_macro(&self, _name: &str, _value: &[u8]) {}
+
+    /// This will be run on every function-like macro. The callback cannot
+    /// influence the further treatment of the macro, but may use the value to
+    /// generate additional code or configuration.
+    ///
+    /// The first parameter represents the name and argument list (including the
+    /// parentheses) of the function-like macro. The second parameter represents
+    /// the expansion of the macro as a sequence of tokens.
+    fn func_macro(&self, _name: &str, _value: &[&[u8]]) {}
+
+    /// This function should return whether, given an enum variant
+    /// name, and value, this enum variant will forcibly be a constant.
+    fn enum_variant_behavior(
+        &self,
+        _enum_name: Option<&str>,
+        _original_variant_name: &str,
+        _variant_value: EnumVariantValue,
+    ) -> Option<EnumVariantCustomBehavior> {
+        None
+    }
+
+    /// Allows to rename an enum variant, replacing `_original_variant_name`.
+    fn enum_variant_name(
+        &self,
+        _enum_name: Option<&str>,
+        _original_variant_name: &str,
+        _variant_value: EnumVariantValue,
+    ) -> Option<String> {
+        None
+    }
+
+    /// Allows to rename an item, replacing `_original_item_name`.
+    fn item_name(&self, _original_item_name: &str) -> Option<String> {
+        None
+    }
+
+    /// This will be called on every file inclusion, with the full path of the included file.
+    fn include_file(&self, _filename: &str) {}
+
+    /// This will be called to determine whether a particular blocklisted type
+    /// implements a trait or not. This will be used to implement traits on
+    /// other types containing the blocklisted type.
+    ///
+    /// * `None`: use the default behavior
+    /// * `Some(ImplementsTrait::Yes)`: `_name` implements `_derive_trait`
+    /// * `Some(ImplementsTrait::Manually)`: any type including `_name` can't
+    ///   derive `_derive_trait` but can implemented it manually
+    /// * `Some(ImplementsTrait::No)`: `_name` doesn't implement `_derive_trait`
+    fn blocklisted_type_implements_trait(
+        &self,
+        _name: &str,
+        _derive_trait: DeriveTrait,
+    ) -> Option<ImplementsTrait> {
+        None
+    }
+
+    /// Provide a list of custom derive attributes.
+    ///
+    /// If no additional attributes are wanted, this function should return an
+    /// empty `Vec`.
+    fn add_derives(&self, _info: &DeriveInfo<'_>) -> Vec<String> {
+        vec![]
+    }
+
+    /// Process a source code comment.
+    fn process_comment(&self, _comment: &str) -> Option<String> {
+        None
+    }
+}
+
+/// Relevant information about a type to which new derive attributes will be added using
+/// [`ParseCallbacks::add_derives`].
+#[derive(Debug)]
+#[non_exhaustive]
+pub struct DeriveInfo<'a> {
+    /// The name of the type.
+    pub name: &'a str,
+    /// The kind of the type.
+    pub kind: TypeKind,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+/// The kind of the current type.
+pub enum TypeKind {
+    /// The type is a Rust `struct`.
+    Struct,
+    /// The type is a Rust `enum`.
+    Enum,
+    /// The type is a Rust `union`.
+    Union,
+}
+
+/// An struct providing information about the item being passed to `ParseCallbacks::generated_name_override`.
+#[non_exhaustive]
+pub struct ItemInfo<'a> {
+    /// The name of the item
+    pub name: &'a str,
+    /// The kind of item
+    pub kind: ItemKind,
+}
+
+/// An enum indicating the kind of item for an ItemInfo.
+#[non_exhaustive]
+pub enum ItemKind {
+    /// A Function
+    Function,
+    /// A Variable
+    Var,
+}