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//! Helpers for code generation that don't need macro expansion.
use ir::layout::Layout;
use quote;
pub mod attributes {
use quote;
pub fn repr(which: &str) -> quote::Tokens {
let which = quote::Ident::new(which);
quote! {
#[repr( #which )]
}
}
pub fn repr_list(which_ones: &[&str]) -> quote::Tokens {
let which_ones = which_ones.iter().cloned().map(quote::Ident::new);
quote! {
#[repr( #( #which_ones ),* )]
}
}
pub fn derives(which_ones: &[&str]) -> quote::Tokens {
let which_ones = which_ones.iter().cloned().map(quote::Ident::new);
quote! {
#[derive( #( #which_ones ),* )]
}
}
pub fn inline() -> quote::Tokens {
quote! {
#[inline]
}
}
pub fn doc(comment: String) -> quote::Tokens {
// Doc comments are already preprocessed into nice `///` formats by the
// time they get here. Just make sure that we have newlines around it so
// that nothing else gets wrapped into the comment.
let mut tokens = quote! {};
tokens.append("\n");
tokens.append(comment);
tokens.append("\n");
tokens
}
pub fn link_name(name: &str) -> quote::Tokens {
quote! {
#[link_name = #name]
}
}
}
/// Generates a proper type for a field or type with a given `Layout`, that is,
/// a type with the correct size and alignment restrictions.
pub fn blob(layout: Layout) -> quote::Tokens {
let opaque = layout.opaque();
// FIXME(emilio, #412): We fall back to byte alignment, but there are
// some things that legitimately are more than 8-byte aligned.
//
// Eventually we should be able to `unwrap` here, but...
let ty_name = match opaque.known_rust_type_for_array() {
Some(ty) => ty,
None => {
warn!("Found unknown alignment on code generation!");
"u8"
}
};
let ty_name = quote::Ident::new(ty_name);
let data_len = opaque.array_size().unwrap_or(layout.size);
if data_len == 1 {
quote! {
#ty_name
}
} else {
quote! {
[ #ty_name ; #data_len ]
}
}
}
pub mod ast_ty {
use ir::context::BindgenContext;
use ir::function::FunctionSig;
use ir::ty::FloatKind;
use quote;
pub fn raw_type(ctx: &BindgenContext, name: &str) -> quote::Tokens {
let ident = ctx.rust_ident_raw(name);
match ctx.options().ctypes_prefix {
Some(ref prefix) => {
let prefix = ctx.rust_ident_raw(prefix.as_str());
quote! {
#prefix::#ident
}
}
None => quote! {
::std::os::raw::#ident
},
}
}
pub fn float_kind_rust_type(
ctx: &BindgenContext,
fk: FloatKind,
) -> quote::Tokens {
// TODO: we probably should just take the type layout into
// account?
//
// Also, maybe this one shouldn't be the default?
//
// FIXME: `c_longdouble` doesn't seem to be defined in some
// systems, so we use `c_double` directly.
match (fk, ctx.options().convert_floats) {
(FloatKind::Float, true) => quote! { f32 },
(FloatKind::Double, true) |
(FloatKind::LongDouble, true) => quote! { f64 },
(FloatKind::Float, false) => raw_type(ctx, "c_float"),
(FloatKind::Double, false) |
(FloatKind::LongDouble, false) => raw_type(ctx, "c_double"),
(FloatKind::Float128, _) => quote! { [u8; 16] },
}
}
pub fn int_expr(val: i64) -> quote::Tokens {
// Don't use quote! { #val } because that adds the type suffix.
let mut tokens = quote! {};
tokens.append(val.to_string());
tokens
}
pub fn uint_expr(val: u64) -> quote::Tokens {
// Don't use quote! { #val } because that adds the type suffix.
let mut tokens = quote! {};
tokens.append(val.to_string());
tokens
}
pub fn byte_array_expr(bytes: &[u8]) -> quote::Tokens {
let mut bytes: Vec<_> = bytes.iter().cloned().collect();
bytes.push(0);
quote! {
#bytes
}
}
pub fn cstr_expr(mut string: String) -> quote::Tokens {
string.push('\0');
let b = quote::ByteStr(&string);
quote! {
#b
}
}
pub fn float_expr(
ctx: &BindgenContext,
f: f64,
) -> Result<quote::Tokens, ()> {
if f.is_finite() {
let mut string = f.to_string();
// So it gets properly recognised as a floating point constant.
if !string.contains('.') {
string.push('.');
}
let mut tokens = quote! {};
tokens.append(string);
return Ok(tokens);
}
let prefix = ctx.trait_prefix();
if f.is_nan() {
return Ok(quote! {
::#prefix::f64::NAN
});
}
if f.is_infinite() {
return Ok(if f.is_sign_positive() {
quote! {
::#prefix::f64::INFINITY
}
} else {
quote! {
::#prefix::f64::NEG_INFINITY
}
});
}
warn!("Unknown non-finite float number: {:?}", f);
return Err(());
}
pub fn arguments_from_signature(
signature: &FunctionSig,
ctx: &BindgenContext,
) -> Vec<quote::Tokens> {
let mut unnamed_arguments = 0;
signature
.argument_types()
.iter()
.map(|&(ref name, _ty)| {
match *name {
Some(ref name) => {
let name = ctx.rust_ident(name);
quote! { #name }
}
None => {
unnamed_arguments += 1;
let name = ctx.rust_ident(format!("arg{}", unnamed_arguments));
quote! { #name }
}
}
})
.collect()
}
}
|
