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|
//! Helpers for code generation that don't need macro expansion.
use aster;
use ir::layout::Layout;
use syntax::ast;
use syntax::ptr::P;
pub mod attributes {
use aster;
use syntax::ast;
pub fn repr(which: &str) -> ast::Attribute {
aster::AstBuilder::new().attr().list("repr").words(&[which]).build()
}
pub fn repr_list(which_ones: &[&str]) -> ast::Attribute {
aster::AstBuilder::new().attr().list("repr").words(which_ones).build()
}
pub fn derives(which_ones: &[&str]) -> ast::Attribute {
aster::AstBuilder::new().attr().list("derive").words(which_ones).build()
}
pub fn inline() -> ast::Attribute {
aster::AstBuilder::new().attr().word("inline")
}
pub fn doc(comment: &str) -> ast::Attribute {
aster::AstBuilder::new().attr().doc(comment)
}
pub fn link_name(name: &str) -> ast::Attribute {
aster::AstBuilder::new().attr().name_value("link_name").str(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 struct BlobTyBuilder {
layout: Layout,
}
impl BlobTyBuilder {
pub fn new(layout: Layout) -> Self {
BlobTyBuilder {
layout: layout,
}
}
pub fn build(self) -> P<ast::Ty> {
use std::cmp;
let ty_name = match self.layout.align {
8 => "u64",
4 => "u32",
2 => "u16",
1 | _ => "u8",
};
let data_len = if ty_name == "u8" {
self.layout.size
} else {
self.layout.size / cmp::max(self.layout.align, 1)
};
let inner_ty = aster::AstBuilder::new().ty().path().id(ty_name).build();
if data_len == 1 {
inner_ty
} else {
aster::ty::TyBuilder::new().array(data_len).build(inner_ty)
}
}
}
pub mod ast_ty {
use aster;
use ir::context::BindgenContext;
use ir::ty::FloatKind;
use syntax::ast;
use syntax::ptr::P;
pub fn raw_type(ctx: &BindgenContext, name: &str) -> P<ast::Ty> {
let ident = ctx.rust_ident_raw(&name);
match ctx.options().ctypes_prefix {
Some(ref prefix) => {
let prefix = ctx.rust_ident_raw(prefix);
quote_ty!(ctx.ext_cx(), $prefix::$ident)
}
None => quote_ty!(ctx.ext_cx(), ::std::os::raw::$ident),
}
}
pub fn float_kind_rust_type(ctx: &BindgenContext,
fk: FloatKind)
-> P<ast::Ty> {
macro_rules! raw {
($ty: ident) => {
raw_type(ctx, stringify!($ty))
}
}
// 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) => aster::ty::TyBuilder::new().f32(),
(FloatKind::Double, true) |
(FloatKind::LongDouble, true) => aster::ty::TyBuilder::new().f64(),
(FloatKind::Float, false) => raw!(c_float),
(FloatKind::Double, false) |
(FloatKind::LongDouble, false) => raw!(c_double),
(FloatKind::Float128, _) => {
aster::ty::TyBuilder::new().array(16).u8()
}
}
}
pub fn int_expr(val: i64) -> P<ast::Expr> {
use std::i64;
let expr = aster::AstBuilder::new().expr();
// This is not representable as an i64 if it's negative, so we
// special-case it.
//
// Fix in aster incoming.
if val == i64::MIN {
expr.neg().uint(1u64 << 63)
} else {
expr.int(val)
}
}
}
|
