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extern crate quote;
#[macro_use]
extern crate syn;
#[macro_use]
extern crate synstructure;
#[cfg(not(test))]
decl_derive!([MallocSizeOf, attributes(ignore_malloc_size_of, with_malloc_size_of_func)] => malloc_size_of_derive);
fn malloc_size_of_derive(s: synstructure::Structure) -> quote::Tokens {
let match_body = s.each(|binding| {
let ignore = binding
.ast()
.attrs
.iter()
.any(|attr| match attr.interpret_meta().unwrap() {
syn::Meta::Word(ref ident) | syn::Meta::List(syn::MetaList { ref ident, .. })
if ident == "ignore_malloc_size_of" =>
{
panic!(
"#[ignore_malloc_size_of] should have an explanation, \
e.g. #[ignore_malloc_size_of = \"because reasons\"]"
);
}
syn::Meta::NameValue(syn::MetaNameValue { ref ident, .. })
if ident == "ignore_malloc_size_of" =>
{
true
},
_ => false,
});
let with_function : Option<syn::Path> = binding
.ast()
.attrs
.iter()
.filter_map(|attr| match attr.interpret_meta().unwrap() {
syn::Meta::Word(ref ident) | syn::Meta::List(syn::MetaList { ref ident, .. })
if ident == "with_malloc_size_of_func" =>
{
panic!(
"#[with_malloc_size_of_func] must have a function name as argument, \
e.g. #[with_malloc_size_of_func = \"util::measure_btreemap\"]"
);
}
syn::Meta::NameValue(syn::MetaNameValue { ref ident, ref lit, .. })
if ident == "with_malloc_size_of_func" =>
{
if let syn::Lit::Str(ref lit) = lit {
let as_path = lit.parse::<syn::Path>();
match as_path {
Ok(as_path) => Some(as_path),
Err(_err) => {
panic!("The argument of #[with_malloc_size_of_func = \"...\"] must be the path to a function which is in scope.");
}
}
} else {
panic!(
"#[with_malloc_size_of_func] must have a function name as argument and this must be a string, \
e.g. #[with_malloc_size_of_func = \"util::measure_btreemap\"]"
);
}
},
_ => None,
})
.next();
if ignore {
None
} else if let Some(with_function) = with_function {
Some(quote! {
sum += #with_function(#binding, ops);
})
} else if let syn::Type::Array(..) = binding.ast().ty {
Some(quote! {
for item in #binding.iter() {
sum += ::malloc_size_of::MallocSizeOf::size_of(item, ops);
}
})
} else {
Some(quote! {
sum += ::malloc_size_of::MallocSizeOf::size_of(#binding, ops);
})
}
});
let ast = s.ast();
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let mut where_clause = where_clause.unwrap_or(&parse_quote!(where)).clone();
for param in ast.generics.type_params() {
let ident = param.ident;
where_clause
.predicates
.push(parse_quote!(#ident: ::malloc_size_of::MallocSizeOf));
}
let tokens = quote! {
impl #impl_generics ::malloc_size_of::MallocSizeOf for #name #ty_generics #where_clause {
#[inline]
#[allow(unused_variables, unused_mut, unreachable_code)]
fn size_of(&self, ops: &mut ::malloc_size_of::MallocSizeOfOps) -> usize {
let mut sum = 0;
match *self {
#match_body
}
sum
}
}
};
tokens
}
#[test]
fn test_struct() {
let source = syn::parse_str(
"struct Foo<T> { bar: Bar, baz: T, #[ignore_malloc_size_of = \"\"] z: Arc<T> }",
).unwrap();
let source = synstructure::Structure::new(&source);
let expanded = malloc_size_of_derive(source).to_string();
let mut no_space = expanded.replace(" ", "");
macro_rules! match_count {
($e: expr, $count: expr) => {
assert_eq!(
no_space.matches(&$e.replace(" ", "")).count(),
$count,
"counting occurences of {:?} in {:?} (whitespace-insensitive)",
$e,
expanded
)
};
}
match_count!("struct", 0);
match_count!("ignore_malloc_size_of", 0);
match_count!("impl<T> ::malloc_size_of::MallocSizeOf for Foo<T> where T: ::malloc_size_of::MallocSizeOf {", 1);
match_count!("sum += ::malloc_size_of::MallocSizeOf::size_of(", 2);
let source = syn::parse_str("struct Bar([Baz; 3]);").unwrap();
let source = synstructure::Structure::new(&source);
let expanded = malloc_size_of_derive(source).to_string();
no_space = expanded.replace(" ", "");
match_count!("for item in", 1);
}
#[should_panic(expected = "should have an explanation")]
#[test]
fn test_no_reason() {
let input = syn::parse_str("struct A { #[ignore_malloc_size_of] b: C }").unwrap();
malloc_size_of_derive(synstructure::Structure::new(&input));
}
#[test]
fn test_with_function() {
let source = syn::parse_str(
"struct Foo { bar: Bar, #[with_malloc_size_of_func = \"col::anothermod::custom_func\"] baz: Baz,
#[with_malloc_size_of_func = \"my_func\"]
baz2: Baz}",
).unwrap();
let source = synstructure::Structure::new(&source);
let expanded = malloc_size_of_derive(source).to_string();
let no_space = expanded.replace(" ", "");
macro_rules! match_count {
($e: expr, $count: expr) => {
assert_eq!(
no_space.matches(&$e.replace(" ", "")).count(),
$count,
"counting occurences of {:?} in {:?} (whitespace-insensitive)",
$e,
expanded
)
};
}
match_count!("struct", 0);
match_count!("ignore_malloc_size_of", 0);
match_count!("impl::malloc_size_of::MallocSizeOf for Foo {", 1);
match_count!("sum += ::malloc_size_of::MallocSizeOf::size_of(", 1);
match_count!("sum += col::anothermod::custom_func(", 1);
match_count!("sum += my_func(", 1);
}