--- /dev/null
+use crate::base::ExtCtxt;
+
+use rustc_ast::attr;
+use rustc_ast::ptr::P;
+use rustc_ast::{self as ast, AttrVec, BlockCheckMode, Expr, PatKind, UnOp};
+use rustc_span::source_map::Spanned;
+use rustc_span::symbol::{kw, sym, Ident, Symbol};
+
+use rustc_span::Span;
+
+impl<'a> ExtCtxt<'a> {
+ pub fn path(&self, span: Span, strs: Vec<Ident>) -> ast::Path {
+ self.path_all(span, false, strs, vec![])
+ }
+ pub fn path_ident(&self, span: Span, id: Ident) -> ast::Path {
+ self.path(span, vec![id])
+ }
+ pub fn path_global(&self, span: Span, strs: Vec<Ident>) -> ast::Path {
+ self.path_all(span, true, strs, vec![])
+ }
+ pub fn path_all(
+ &self,
+ span: Span,
+ global: bool,
+ mut idents: Vec<Ident>,
+ args: Vec<ast::GenericArg>,
+ ) -> ast::Path {
+ assert!(!idents.is_empty());
+ let add_root = global && !idents[0].is_path_segment_keyword();
+ let mut segments = Vec::with_capacity(idents.len() + add_root as usize);
+ if add_root {
+ segments.push(ast::PathSegment::path_root(span));
+ }
+ let last_ident = idents.pop().unwrap();
+ segments.extend(
+ idents.into_iter().map(|ident| ast::PathSegment::from_ident(ident.with_span_pos(span))),
+ );
+ let args = if !args.is_empty() {
+ let args = args.into_iter().map(ast::AngleBracketedArg::Arg).collect();
+ ast::AngleBracketedArgs { args, span }.into()
+ } else {
+ None
+ };
+ segments.push(ast::PathSegment {
+ ident: last_ident.with_span_pos(span),
+ id: ast::DUMMY_NODE_ID,
+ args,
+ });
+ ast::Path { span, segments, tokens: None }
+ }
+
+ pub fn ty_mt(&self, ty: P<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy {
+ ast::MutTy { ty, mutbl }
+ }
+
+ pub fn ty(&self, span: Span, kind: ast::TyKind) -> P<ast::Ty> {
+ P(ast::Ty { id: ast::DUMMY_NODE_ID, span, kind, tokens: None })
+ }
+
+ pub fn ty_path(&self, path: ast::Path) -> P<ast::Ty> {
+ self.ty(path.span, ast::TyKind::Path(None, path))
+ }
+
+ // Might need to take bounds as an argument in the future, if you ever want
+ // to generate a bounded existential trait type.
+ pub fn ty_ident(&self, span: Span, ident: Ident) -> P<ast::Ty> {
+ self.ty_path(self.path_ident(span, ident))
+ }
+
+ pub fn anon_const(&self, span: Span, kind: ast::ExprKind) -> ast::AnonConst {
+ ast::AnonConst {
+ id: ast::DUMMY_NODE_ID,
+ value: P(ast::Expr {
+ id: ast::DUMMY_NODE_ID,
+ kind,
+ span,
+ attrs: AttrVec::new(),
+ tokens: None,
+ }),
+ }
+ }
+
+ pub fn const_ident(&self, span: Span, ident: Ident) -> ast::AnonConst {
+ self.anon_const(span, ast::ExprKind::Path(None, self.path_ident(span, ident)))
+ }
+
+ pub fn ty_rptr(
+ &self,
+ span: Span,
+ ty: P<ast::Ty>,
+ lifetime: Option<ast::Lifetime>,
+ mutbl: ast::Mutability,
+ ) -> P<ast::Ty> {
+ self.ty(span, ast::TyKind::Rptr(lifetime, self.ty_mt(ty, mutbl)))
+ }
+
+ pub fn ty_ptr(&self, span: Span, ty: P<ast::Ty>, mutbl: ast::Mutability) -> P<ast::Ty> {
+ self.ty(span, ast::TyKind::Ptr(self.ty_mt(ty, mutbl)))
+ }
+
+ pub fn typaram(
+ &self,
+ span: Span,
+ ident: Ident,
+ attrs: Vec<ast::Attribute>,
+ bounds: ast::GenericBounds,
+ default: Option<P<ast::Ty>>,
+ ) -> ast::GenericParam {
+ ast::GenericParam {
+ ident: ident.with_span_pos(span),
+ id: ast::DUMMY_NODE_ID,
+ attrs: attrs.into(),
+ bounds,
+ kind: ast::GenericParamKind::Type { default },
+ is_placeholder: false,
+ }
+ }
+
+ pub fn trait_ref(&self, path: ast::Path) -> ast::TraitRef {
+ ast::TraitRef { path, ref_id: ast::DUMMY_NODE_ID }
+ }
+
+ pub fn poly_trait_ref(&self, span: Span, path: ast::Path) -> ast::PolyTraitRef {
+ ast::PolyTraitRef {
+ bound_generic_params: Vec::new(),
+ trait_ref: self.trait_ref(path),
+ span,
+ }
+ }
+
+ pub fn trait_bound(&self, path: ast::Path) -> ast::GenericBound {
+ ast::GenericBound::Trait(
+ self.poly_trait_ref(path.span, path),
+ ast::TraitBoundModifier::None,
+ )
+ }
+
+ pub fn lifetime(&self, span: Span, ident: Ident) -> ast::Lifetime {
+ ast::Lifetime { id: ast::DUMMY_NODE_ID, ident: ident.with_span_pos(span) }
+ }
+
+ pub fn stmt_expr(&self, expr: P<ast::Expr>) -> ast::Stmt {
+ ast::Stmt { id: ast::DUMMY_NODE_ID, span: expr.span, kind: ast::StmtKind::Expr(expr) }
+ }
+
+ pub fn stmt_let(&self, sp: Span, mutbl: bool, ident: Ident, ex: P<ast::Expr>) -> ast::Stmt {
+ let pat = if mutbl {
+ let binding_mode = ast::BindingMode::ByValue(ast::Mutability::Mut);
+ self.pat_ident_binding_mode(sp, ident, binding_mode)
+ } else {
+ self.pat_ident(sp, ident)
+ };
+ let local = P(ast::Local {
+ pat,
+ ty: None,
+ init: Some(ex),
+ id: ast::DUMMY_NODE_ID,
+ span: sp,
+ attrs: AttrVec::new(),
+ tokens: None,
+ });
+ ast::Stmt { id: ast::DUMMY_NODE_ID, kind: ast::StmtKind::Local(local), span: sp }
+ }
+
+ // Generates `let _: Type;`, which is usually used for type assertions.
+ pub fn stmt_let_type_only(&self, span: Span, ty: P<ast::Ty>) -> ast::Stmt {
+ let local = P(ast::Local {
+ pat: self.pat_wild(span),
+ ty: Some(ty),
+ init: None,
+ id: ast::DUMMY_NODE_ID,
+ span,
+ attrs: AttrVec::new(),
+ tokens: None,
+ });
+ ast::Stmt { id: ast::DUMMY_NODE_ID, kind: ast::StmtKind::Local(local), span }
+ }
+
+ pub fn stmt_item(&self, sp: Span, item: P<ast::Item>) -> ast::Stmt {
+ ast::Stmt { id: ast::DUMMY_NODE_ID, kind: ast::StmtKind::Item(item), span: sp }
+ }
+
+ pub fn block_expr(&self, expr: P<ast::Expr>) -> P<ast::Block> {
+ self.block(
+ expr.span,
+ vec![ast::Stmt {
+ id: ast::DUMMY_NODE_ID,
+ span: expr.span,
+ kind: ast::StmtKind::Expr(expr),
+ }],
+ )
+ }
+ pub fn block(&self, span: Span, stmts: Vec<ast::Stmt>) -> P<ast::Block> {
+ P(ast::Block {
+ stmts,
+ id: ast::DUMMY_NODE_ID,
+ rules: BlockCheckMode::Default,
+ span,
+ tokens: None,
+ })
+ }
+
+ pub fn expr(&self, span: Span, kind: ast::ExprKind) -> P<ast::Expr> {
+ P(ast::Expr { id: ast::DUMMY_NODE_ID, kind, span, attrs: AttrVec::new(), tokens: None })
+ }
+
+ pub fn expr_path(&self, path: ast::Path) -> P<ast::Expr> {
+ self.expr(path.span, ast::ExprKind::Path(None, path))
+ }
+
+ pub fn expr_ident(&self, span: Span, id: Ident) -> P<ast::Expr> {
+ self.expr_path(self.path_ident(span, id))
+ }
+ pub fn expr_self(&self, span: Span) -> P<ast::Expr> {
+ self.expr_ident(span, Ident::with_dummy_span(kw::SelfLower))
+ }
+
+ pub fn expr_binary(
+ &self,
+ sp: Span,
+ op: ast::BinOpKind,
+ lhs: P<ast::Expr>,
+ rhs: P<ast::Expr>,
+ ) -> P<ast::Expr> {
+ self.expr(sp, ast::ExprKind::Binary(Spanned { node: op, span: sp }, lhs, rhs))
+ }
+
+ pub fn expr_deref(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+ self.expr(sp, ast::ExprKind::Unary(UnOp::Deref, e))
+ }
+
+ pub fn expr_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+ self.expr(sp, ast::ExprKind::AddrOf(ast::BorrowKind::Ref, ast::Mutability::Not, e))
+ }
+
+ pub fn expr_call(
+ &self,
+ span: Span,
+ expr: P<ast::Expr>,
+ args: Vec<P<ast::Expr>>,
+ ) -> P<ast::Expr> {
+ self.expr(span, ast::ExprKind::Call(expr, args))
+ }
+ pub fn expr_call_ident(&self, span: Span, id: Ident, args: Vec<P<ast::Expr>>) -> P<ast::Expr> {
+ self.expr(span, ast::ExprKind::Call(self.expr_ident(span, id), args))
+ }
+ pub fn expr_call_global(
+ &self,
+ sp: Span,
+ fn_path: Vec<Ident>,
+ args: Vec<P<ast::Expr>>,
+ ) -> P<ast::Expr> {
+ let pathexpr = self.expr_path(self.path_global(sp, fn_path));
+ self.expr_call(sp, pathexpr, args)
+ }
+ pub fn expr_method_call(
+ &self,
+ span: Span,
+ expr: P<ast::Expr>,
+ ident: Ident,
+ mut args: Vec<P<ast::Expr>>,
+ ) -> P<ast::Expr> {
+ args.insert(0, expr);
+ let segment = ast::PathSegment::from_ident(ident.with_span_pos(span));
+ self.expr(span, ast::ExprKind::MethodCall(segment, args, span))
+ }
+ pub fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr> {
+ self.expr(b.span, ast::ExprKind::Block(b, None))
+ }
+ pub fn field_imm(&self, span: Span, ident: Ident, e: P<ast::Expr>) -> ast::Field {
+ ast::Field {
+ ident: ident.with_span_pos(span),
+ expr: e,
+ span,
+ is_shorthand: false,
+ attrs: AttrVec::new(),
+ id: ast::DUMMY_NODE_ID,
+ is_placeholder: false,
+ }
+ }
+ pub fn expr_struct(
+ &self,
+ span: Span,
+ path: ast::Path,
+ fields: Vec<ast::Field>,
+ ) -> P<ast::Expr> {
+ self.expr(span, ast::ExprKind::Struct(path, fields, ast::StructRest::None))
+ }
+ pub fn expr_struct_ident(
+ &self,
+ span: Span,
+ id: Ident,
+ fields: Vec<ast::Field>,
+ ) -> P<ast::Expr> {
+ self.expr_struct(span, self.path_ident(span, id), fields)
+ }
+
+ pub fn expr_lit(&self, span: Span, lit_kind: ast::LitKind) -> P<ast::Expr> {
+ let lit = ast::Lit::from_lit_kind(lit_kind, span);
+ self.expr(span, ast::ExprKind::Lit(lit))
+ }
+ pub fn expr_usize(&self, span: Span, i: usize) -> P<ast::Expr> {
+ self.expr_lit(
+ span,
+ ast::LitKind::Int(i as u128, ast::LitIntType::Unsigned(ast::UintTy::Usize)),
+ )
+ }
+ pub fn expr_u32(&self, sp: Span, u: u32) -> P<ast::Expr> {
+ self.expr_lit(sp, ast::LitKind::Int(u as u128, ast::LitIntType::Unsigned(ast::UintTy::U32)))
+ }
+ pub fn expr_bool(&self, sp: Span, value: bool) -> P<ast::Expr> {
+ self.expr_lit(sp, ast::LitKind::Bool(value))
+ }
+
+ pub fn expr_vec(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
+ self.expr(sp, ast::ExprKind::Array(exprs))
+ }
+ pub fn expr_vec_slice(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
+ self.expr_addr_of(sp, self.expr_vec(sp, exprs))
+ }
+ pub fn expr_str(&self, sp: Span, s: Symbol) -> P<ast::Expr> {
+ self.expr_lit(sp, ast::LitKind::Str(s, ast::StrStyle::Cooked))
+ }
+
+ pub fn expr_cast(&self, sp: Span, expr: P<ast::Expr>, ty: P<ast::Ty>) -> P<ast::Expr> {
+ self.expr(sp, ast::ExprKind::Cast(expr, ty))
+ }
+
+ pub fn expr_some(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
+ let some = self.std_path(&[sym::option, sym::Option, sym::Some]);
+ self.expr_call_global(sp, some, vec![expr])
+ }
+
+ pub fn expr_tuple(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
+ self.expr(sp, ast::ExprKind::Tup(exprs))
+ }
+
+ pub fn expr_fail(&self, span: Span, msg: Symbol) -> P<ast::Expr> {
+ self.expr_call_global(
+ span,
+ [sym::std, sym::rt, sym::begin_panic].iter().map(|s| Ident::new(*s, span)).collect(),
+ vec![self.expr_str(span, msg)],
+ )
+ }
+
+ pub fn expr_unreachable(&self, span: Span) -> P<ast::Expr> {
+ self.expr_fail(span, Symbol::intern("internal error: entered unreachable code"))
+ }
+
+ pub fn expr_ok(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
+ let ok = self.std_path(&[sym::result, sym::Result, sym::Ok]);
+ self.expr_call_global(sp, ok, vec![expr])
+ }
+
+ pub fn expr_try(&self, sp: Span, head: P<ast::Expr>) -> P<ast::Expr> {
+ let ok = self.std_path(&[sym::result, sym::Result, sym::Ok]);
+ let ok_path = self.path_global(sp, ok);
+ let err = self.std_path(&[sym::result, sym::Result, sym::Err]);
+ let err_path = self.path_global(sp, err);
+
+ let binding_variable = Ident::new(sym::__try_var, sp);
+ let binding_pat = self.pat_ident(sp, binding_variable);
+ let binding_expr = self.expr_ident(sp, binding_variable);
+
+ // `Ok(__try_var)` pattern
+ let ok_pat = self.pat_tuple_struct(sp, ok_path, vec![binding_pat.clone()]);
+
+ // `Err(__try_var)` (pattern and expression respectively)
+ let err_pat = self.pat_tuple_struct(sp, err_path.clone(), vec![binding_pat]);
+ let err_inner_expr =
+ self.expr_call(sp, self.expr_path(err_path), vec![binding_expr.clone()]);
+ // `return Err(__try_var)`
+ let err_expr = self.expr(sp, ast::ExprKind::Ret(Some(err_inner_expr)));
+
+ // `Ok(__try_var) => __try_var`
+ let ok_arm = self.arm(sp, ok_pat, binding_expr);
+ // `Err(__try_var) => return Err(__try_var)`
+ let err_arm = self.arm(sp, err_pat, err_expr);
+
+ // `match head { Ok() => ..., Err() => ... }`
+ self.expr_match(sp, head, vec![ok_arm, err_arm])
+ }
+
+ pub fn pat(&self, span: Span, kind: PatKind) -> P<ast::Pat> {
+ P(ast::Pat { id: ast::DUMMY_NODE_ID, kind, span, tokens: None })
+ }
+ pub fn pat_wild(&self, span: Span) -> P<ast::Pat> {
+ self.pat(span, PatKind::Wild)
+ }
+ pub fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat> {
+ self.pat(span, PatKind::Lit(expr))
+ }
+ pub fn pat_ident(&self, span: Span, ident: Ident) -> P<ast::Pat> {
+ let binding_mode = ast::BindingMode::ByValue(ast::Mutability::Not);
+ self.pat_ident_binding_mode(span, ident, binding_mode)
+ }
+
+ pub fn pat_ident_binding_mode(
+ &self,
+ span: Span,
+ ident: Ident,
+ bm: ast::BindingMode,
+ ) -> P<ast::Pat> {
+ let pat = PatKind::Ident(bm, ident.with_span_pos(span), None);
+ self.pat(span, pat)
+ }
+ pub fn pat_path(&self, span: Span, path: ast::Path) -> P<ast::Pat> {
+ self.pat(span, PatKind::Path(None, path))
+ }
+ pub fn pat_tuple_struct(
+ &self,
+ span: Span,
+ path: ast::Path,
+ subpats: Vec<P<ast::Pat>>,
+ ) -> P<ast::Pat> {
+ self.pat(span, PatKind::TupleStruct(path, subpats))
+ }
+ pub fn pat_struct(
+ &self,
+ span: Span,
+ path: ast::Path,
+ field_pats: Vec<ast::FieldPat>,
+ ) -> P<ast::Pat> {
+ self.pat(span, PatKind::Struct(path, field_pats, false))
+ }
+ pub fn pat_tuple(&self, span: Span, pats: Vec<P<ast::Pat>>) -> P<ast::Pat> {
+ self.pat(span, PatKind::Tuple(pats))
+ }
+
+ pub fn pat_some(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
+ let some = self.std_path(&[sym::option, sym::Option, sym::Some]);
+ let path = self.path_global(span, some);
+ self.pat_tuple_struct(span, path, vec![pat])
+ }
+
+ pub fn arm(&self, span: Span, pat: P<ast::Pat>, expr: P<ast::Expr>) -> ast::Arm {
+ ast::Arm {
+ attrs: vec![],
+ pat,
+ guard: None,
+ body: expr,
+ span,
+ id: ast::DUMMY_NODE_ID,
+ is_placeholder: false,
+ }
+ }
+
+ pub fn arm_unreachable(&self, span: Span) -> ast::Arm {
+ self.arm(span, self.pat_wild(span), self.expr_unreachable(span))
+ }
+
+ pub fn expr_match(&self, span: Span, arg: P<ast::Expr>, arms: Vec<ast::Arm>) -> P<Expr> {
+ self.expr(span, ast::ExprKind::Match(arg, arms))
+ }
+
+ pub fn expr_if(
+ &self,
+ span: Span,
+ cond: P<ast::Expr>,
+ then: P<ast::Expr>,
+ els: Option<P<ast::Expr>>,
+ ) -> P<ast::Expr> {
+ let els = els.map(|x| self.expr_block(self.block_expr(x)));
+ self.expr(span, ast::ExprKind::If(cond, self.block_expr(then), els))
+ }
+
+ pub fn lambda(&self, span: Span, ids: Vec<Ident>, body: P<ast::Expr>) -> P<ast::Expr> {
+ let fn_decl = self.fn_decl(
+ ids.iter().map(|id| self.param(span, *id, self.ty(span, ast::TyKind::Infer))).collect(),
+ ast::FnRetTy::Default(span),
+ );
+
+ // FIXME -- We are using `span` as the span of the `|...|`
+ // part of the lambda, but it probably (maybe?) corresponds to
+ // the entire lambda body. Probably we should extend the API
+ // here, but that's not entirely clear.
+ self.expr(
+ span,
+ ast::ExprKind::Closure(
+ ast::CaptureBy::Ref,
+ ast::Async::No,
+ ast::Movability::Movable,
+ fn_decl,
+ body,
+ span,
+ ),
+ )
+ }
+
+ pub fn lambda0(&self, span: Span, body: P<ast::Expr>) -> P<ast::Expr> {
+ self.lambda(span, Vec::new(), body)
+ }
+
+ pub fn lambda1(&self, span: Span, body: P<ast::Expr>, ident: Ident) -> P<ast::Expr> {
+ self.lambda(span, vec![ident], body)
+ }
+
+ pub fn lambda_stmts_1(&self, span: Span, stmts: Vec<ast::Stmt>, ident: Ident) -> P<ast::Expr> {
+ self.lambda1(span, self.expr_block(self.block(span, stmts)), ident)
+ }
+
+ pub fn param(&self, span: Span, ident: Ident, ty: P<ast::Ty>) -> ast::Param {
+ let arg_pat = self.pat_ident(span, ident);
+ ast::Param {
+ attrs: AttrVec::default(),
+ id: ast::DUMMY_NODE_ID,
+ pat: arg_pat,
+ span,
+ ty,
+ is_placeholder: false,
+ }
+ }
+
+ // FIXME: unused `self`
+ pub fn fn_decl(&self, inputs: Vec<ast::Param>, output: ast::FnRetTy) -> P<ast::FnDecl> {
+ P(ast::FnDecl { inputs, output })
+ }
+
+ pub fn item(
+ &self,
+ span: Span,
+ name: Ident,
+ attrs: Vec<ast::Attribute>,
+ kind: ast::ItemKind,
+ ) -> P<ast::Item> {
+ // FIXME: Would be nice if our generated code didn't violate
+ // Rust coding conventions
+ P(ast::Item {
+ ident: name,
+ attrs,
+ id: ast::DUMMY_NODE_ID,
+ kind,
+ vis: ast::Visibility {
+ span: span.shrink_to_lo(),
+ kind: ast::VisibilityKind::Inherited,
+ tokens: None,
+ },
+ span,
+ tokens: None,
+ })
+ }
+
+ pub fn item_static(
+ &self,
+ span: Span,
+ name: Ident,
+ ty: P<ast::Ty>,
+ mutbl: ast::Mutability,
+ expr: P<ast::Expr>,
+ ) -> P<ast::Item> {
+ self.item(span, name, Vec::new(), ast::ItemKind::Static(ty, mutbl, Some(expr)))
+ }
+
+ pub fn item_const(
+ &self,
+ span: Span,
+ name: Ident,
+ ty: P<ast::Ty>,
+ expr: P<ast::Expr>,
+ ) -> P<ast::Item> {
+ let def = ast::Defaultness::Final;
+ self.item(span, name, Vec::new(), ast::ItemKind::Const(def, ty, Some(expr)))
+ }
+
+ pub fn attribute(&self, mi: ast::MetaItem) -> ast::Attribute {
+ attr::mk_attr_outer(mi)
+ }
+
+ pub fn meta_word(&self, sp: Span, w: Symbol) -> ast::MetaItem {
+ attr::mk_word_item(Ident::new(w, sp))
+ }
+}
projects / rustc.git / blobdiff