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Derive partialeq "manually" when possible #1012
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bors-servo
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rust-lang:master
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pepyakin:derive-partialeq-manually
Oct 2, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
|
|
||
| use ir::comp::{CompInfo, CompKind, Field, FieldMethods}; | ||
| use ir::context::BindgenContext; | ||
| use ir::item::{IsOpaque, Item}; | ||
| use ir::ty::{TypeKind, RUST_DERIVE_IN_ARRAY_LIMIT}; | ||
| use quote; | ||
|
|
||
| /// Generate a manual implementation of `PartialEq` trait for the | ||
| /// specified compound type. | ||
| pub fn gen_partialeq_impl( | ||
| ctx: &BindgenContext, | ||
| comp_info: &CompInfo, | ||
| item: &Item, | ||
| ty_for_impl: "e::Tokens, | ||
| ) -> Option<quote::Tokens> { | ||
| let mut tokens = vec![]; | ||
|
|
||
| if item.is_opaque(ctx, &()) { | ||
| tokens.push(quote! { | ||
| &self._bindgen_opaque_blob[..] == &other._bindgen_opaque_blob[..] | ||
| }); | ||
| } else if comp_info.kind() == CompKind::Union { | ||
| assert!(!ctx.options().rust_features().untagged_union()); | ||
| tokens.push(quote! { | ||
| &self.bindgen_union_field[..] == &other.bindgen_union_field[..] | ||
| }); | ||
| } else { | ||
| for base in comp_info.base_members().iter() { | ||
| if !base.requires_storage(ctx) { | ||
| continue; | ||
| } | ||
|
|
||
| let ty_item = ctx.resolve_item(base.ty); | ||
| let field_name = &base.field_name; | ||
|
|
||
| if ty_item.is_opaque(ctx, &()) { | ||
| let field_name = ctx.rust_ident(field_name); | ||
| tokens.push(quote! { | ||
| &self. #field_name [..] == &other. #field_name [..] | ||
| }); | ||
| } else { | ||
| tokens.push(gen_field(ctx, ty_item, field_name)); | ||
| } | ||
| } | ||
|
|
||
| for field in comp_info.fields() { | ||
| match *field { | ||
| Field::DataMember(ref fd) => { | ||
| let ty_item = ctx.resolve_item(fd.ty()); | ||
| let name = fd.name().unwrap(); | ||
| tokens.push(gen_field(ctx, ty_item, name)); | ||
| } | ||
| Field::Bitfields(ref bu) => for bitfield in bu.bitfields() { | ||
| let name_ident = ctx.rust_ident_raw(bitfield.name()); | ||
| tokens.push(quote! { | ||
| self.#name_ident () == other.#name_ident () | ||
| }); | ||
| }, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| Some(quote! { | ||
| fn eq(&self, other: & #ty_for_impl) -> bool { | ||
| #( #tokens )&&* | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| fn gen_field(ctx: &BindgenContext, ty_item: &Item, name: &str) -> quote::Tokens { | ||
| fn quote_equals(name_ident: quote::Ident) -> quote::Tokens { | ||
| quote! { self.#name_ident == other.#name_ident } | ||
| } | ||
|
|
||
| let name_ident = ctx.rust_ident(name); | ||
| let ty = ty_item.expect_type(); | ||
|
|
||
| match *ty.kind() { | ||
| TypeKind::Void | | ||
| TypeKind::NullPtr | | ||
| TypeKind::Int(..) | | ||
| TypeKind::Complex(..) | | ||
| TypeKind::Float(..) | | ||
| TypeKind::Enum(..) | | ||
| TypeKind::TypeParam | | ||
| TypeKind::UnresolvedTypeRef(..) | | ||
| TypeKind::BlockPointer | | ||
| TypeKind::Reference(..) | | ||
| TypeKind::ObjCInterface(..) | | ||
| TypeKind::ObjCId | | ||
| TypeKind::ObjCSel | | ||
| TypeKind::Comp(..) | | ||
| TypeKind::Pointer(_) | | ||
| TypeKind::Function(..) | | ||
| TypeKind::Opaque => quote_equals(name_ident), | ||
|
|
||
| TypeKind::TemplateInstantiation(ref inst) => { | ||
| if inst.is_opaque(ctx, &ty_item) { | ||
| quote! { | ||
| &self. #name_ident [..] == &other. #name_ident [..] | ||
| } | ||
| } else { | ||
| quote_equals(name_ident) | ||
| } | ||
| } | ||
|
|
||
| TypeKind::Array(_, len) => if len <= RUST_DERIVE_IN_ARRAY_LIMIT { | ||
| quote_equals(name_ident) | ||
| } else { | ||
| quote! { | ||
| &self. #name_ident [..] == &other. #name_ident [..] | ||
| } | ||
| }, | ||
|
|
||
| TypeKind::ResolvedTypeRef(t) | | ||
| TypeKind::TemplateAlias(t, _) | | ||
| TypeKind::Alias(t) => { | ||
| let inner_item = ctx.resolve_item(t); | ||
| gen_field(ctx, inner_item, name) | ||
| } | ||
| } | ||
| } | ||
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Nice, we don't even need a loop ;)
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I was inspired by rustc itself (Just looked how it handles cases below 32 😄 )