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|
use ir::comp::{BitfieldUnit, CompKind, Field, FieldData, FieldMethods};
use ir::context::BindgenContext;
use ir::derive::CanTriviallyDeriveDebug;
use ir::item::{IsOpaque, Item, ItemCanonicalName};
use ir::ty::{TypeKind, RUST_DERIVE_IN_ARRAY_LIMIT};
use syntax::ast;
use syntax::codemap::DUMMY_SP;
use syntax::parse::token::Token;
use syntax::tokenstream::TokenTree;
pub fn gen_debug_impl(
ctx: &BindgenContext,
fields: &[Field],
item: &Item,
kind: CompKind,
) -> Vec<ast::ImplItem> {
let struct_name = item.canonical_name(ctx);
let mut format_string = format!("{} {{{{ ", struct_name);
let mut tokens: Vec<TokenTree> = Vec::new();
if item.is_opaque(ctx, &()) {
format_string.push_str("opaque");
} else {
match kind {
CompKind::Union => {
format_string.push_str("union");
}
CompKind::Struct => {
let processed_fields = fields.iter().filter_map(|f| match f {
&Field::DataMember(ref fd) => {
gen_field_data_debug_impl(ctx, fd)
}
&Field::Bitfields(ref bu) => {
gen_bitfield_unit_debug_impl(ctx, bu)
}
});
for (i, (fstring, token)) in processed_fields.enumerate() {
if i > 0 {
format_string.push_str(", ");
}
if !token.is_empty() {
tokens.push(TokenTree::Token(DUMMY_SP, Token::Comma));
tokens.extend(token);
}
format_string.push_str(&fstring);
}
}
}
}
format_string.push_str(" }}");
let impl_ = quote_item!(ctx.ext_cx(),
impl X {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
write!(f, $format_string $tokens)
}
});
match impl_.unwrap().node {
ast::ItemKind::Impl(_, _, _, _, _, ref items) => items.clone(),
_ => unreachable!(),
}
}
fn gen_field_data_debug_impl(
ctx: &BindgenContext,
data: &FieldData,
) -> Option<(String, Vec<TokenTree>)> {
if let Some(name) = data.name() {
gen_item_debug_impl(ctx, ctx.resolve_item(data.ty()), name)
} else {
None
}
}
fn gen_bitfield_unit_debug_impl(
ctx: &BindgenContext,
data: &BitfieldUnit,
) -> Option<(String, Vec<TokenTree>)> {
let mut format_string = String::new();
let mut tokens = Vec::new();
for (i, bu) in data.bitfields().iter().enumerate() {
if i > 0 {
format_string.push_str(", ");
tokens.push(TokenTree::Token(DUMMY_SP, Token::Comma));
}
format_string.push_str(&format!("{} : {{:?}}", bu.name()));
let name_ident = ctx.rust_ident_raw(bu.name());
tokens.extend(quote_tokens!(ctx.ext_cx(), self.$name_ident()));
}
Some((format_string, tokens))
}
fn gen_item_debug_impl(
ctx: &BindgenContext,
item: &Item,
name: &str,
) -> Option<(String, Vec<TokenTree>)> {
let name_ident = ctx.rust_ident_raw(name);
let ty = match item.as_type() {
Some(ty) => ty,
None => {
return None;
}
};
fn debug_print(
ctx: &BindgenContext,
name: &str,
name_ident: ast::Ident,
) -> Option<(String, Vec<TokenTree>)> {
Some((
format!("{}: {{:?}}", name),
quote_tokens!(ctx.ext_cx(), self.$name_ident),
))
}
match *ty.kind() {
// Handle the simple cases.
TypeKind::Void |
TypeKind::NullPtr |
TypeKind::Int(..) |
TypeKind::Float(..) |
TypeKind::Complex(..) |
TypeKind::Function(..) |
TypeKind::Enum(..) |
TypeKind::Reference(..) |
TypeKind::BlockPointer |
TypeKind::UnresolvedTypeRef(..) |
TypeKind::ObjCInterface(..) |
TypeKind::ObjCId |
TypeKind::Comp(..) |
TypeKind::ObjCSel => debug_print(ctx, name, name_ident),
TypeKind::TemplateInstantiation(ref inst) => {
if inst.is_opaque(ctx, item) {
Some((format!("{}: opaque", name), vec![]))
} else {
debug_print(ctx, name, name_ident)
}
}
// The generic is not required to implement Debug, so we can not debug print that type
TypeKind::Named => {
Some((format!("{}: Non-debuggable generic", name), vec![]))
}
TypeKind::Array(_, len) => {
// Generics are not required to implement Debug
if ctx.lookup_item_id_has_type_param_in_array(&item.id()) {
Some((format!("{}: Array with length {}", name, len), vec![]))
} else if len < RUST_DERIVE_IN_ARRAY_LIMIT {
// The simple case
debug_print(ctx, name, name_ident)
} else {
// Let's implement our own print function
Some((
format!("{}: [{{}}]", name),
quote_tokens!(
ctx.ext_cx(),
self.$name_ident
.iter()
.enumerate()
.map(|(i, v)| format!("{}{:?}", if i > 0 { ", " } else { "" }, v))
.collect::<String>()),
))
}
}
TypeKind::ResolvedTypeRef(t) |
TypeKind::TemplateAlias(t, _) |
TypeKind::Alias(t) => {
// We follow the aliases
gen_item_debug_impl(ctx, ctx.resolve_item(t), name)
}
TypeKind::Pointer(inner) => {
let inner_type = ctx.resolve_type(inner).canonical_type(ctx);
match *inner_type.kind() {
TypeKind::Function(ref sig)
if !sig.can_trivially_derive_debug() =>
{
Some((format!("{}: FunctionPointer", name), vec![]))
}
_ => debug_print(ctx, name, name_ident),
}
}
TypeKind::Opaque => None,
}
}
|
