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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::codemap::respan;
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 {
ArrayTyBuilder::new().with_len(data_len).build(inner_ty)
}
}
}
pub struct ArrayTyBuilder {
len: usize,
}
impl ArrayTyBuilder {
pub fn new() -> Self {
ArrayTyBuilder {
len: 0,
}
}
pub fn with_len(mut self, len: usize) -> Self {
self.len = len;
self
}
pub fn build(self, ty: P<ast::Ty>) -> P<ast::Ty> {
use syntax::codemap::DUMMY_SP;
let size =
ast::LitKind::Int(self.len as u64,
ast::LitIntType::Unsigned(ast::UintTy::Us));
let size = ast::ExprKind::Lit(P(respan(DUMMY_SP, size)));
let array_kind = ast::TyKind::FixedLengthVec(ty,
P(ast::Expr {
id: ast::DUMMY_NODE_ID,
node: size,
span: DUMMY_SP,
attrs: ast::ThinVec::new(),
})
);
P(ast::Ty {
id: ast::DUMMY_NODE_ID,
node: array_kind,
span: DUMMY_SP,
})
}
}
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