981 lines
30 KiB
Rust
981 lines
30 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast::*;
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use ast;
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use ast_util;
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use codemap::{span, spanned};
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use opt_vec;
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use parse::token;
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use visit;
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use std::hashmap::HashMap;
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use std::int;
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use std::option;
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use std::to_bytes;
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use std::cast;
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use std::local_data;
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pub fn path_name_i(idents: &[ident]) -> ~str {
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// FIXME: Bad copies (#2543 -- same for everything else that says "bad")
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idents.map(|i| token::interner_get(i.name)).connect("::")
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}
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pub fn path_to_ident(p: @Path) -> ident { copy *p.idents.last() }
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pub fn local_def(id: node_id) -> def_id {
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ast::def_id { crate: local_crate, node: id }
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}
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pub fn is_local(did: ast::def_id) -> bool { did.crate == local_crate }
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pub fn stmt_id(s: &stmt) -> node_id {
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match s.node {
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stmt_decl(_, id) => id,
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stmt_expr(_, id) => id,
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stmt_semi(_, id) => id,
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stmt_mac(*) => fail!("attempted to analyze unexpanded stmt")
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}
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}
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pub fn variant_def_ids(d: def) -> Option<(def_id, def_id)> {
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match d {
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def_variant(enum_id, var_id) => {
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Some((enum_id, var_id))
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}
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_ => None
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}
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}
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pub fn def_id_of_def(d: def) -> def_id {
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match d {
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def_fn(id, _) | def_static_method(id, _, _) | def_mod(id) |
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def_foreign_mod(id) | def_static(id, _) |
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def_variant(_, id) | def_ty(id) | def_ty_param(id, _) |
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def_use(id) | def_struct(id) | def_trait(id) => {
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id
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}
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def_arg(id, _) | def_local(id, _) | def_self(id, _) | def_self_ty(id)
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| def_upvar(id, _, _, _) | def_binding(id, _) | def_region(id)
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| def_typaram_binder(id) | def_label(id) => {
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local_def(id)
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}
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def_prim_ty(_) => fail!()
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}
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}
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pub fn binop_to_str(op: binop) -> ~str {
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match op {
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add => return ~"+",
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subtract => return ~"-",
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mul => return ~"*",
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div => return ~"/",
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rem => return ~"%",
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and => return ~"&&",
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or => return ~"||",
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bitxor => return ~"^",
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bitand => return ~"&",
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bitor => return ~"|",
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shl => return ~"<<",
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shr => return ~">>",
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eq => return ~"==",
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lt => return ~"<",
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le => return ~"<=",
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ne => return ~"!=",
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ge => return ~">=",
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gt => return ~">"
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}
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}
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pub fn binop_to_method_name(op: binop) -> Option<~str> {
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match op {
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add => return Some(~"add"),
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subtract => return Some(~"sub"),
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mul => return Some(~"mul"),
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div => return Some(~"div"),
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rem => return Some(~"rem"),
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bitxor => return Some(~"bitxor"),
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bitand => return Some(~"bitand"),
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bitor => return Some(~"bitor"),
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shl => return Some(~"shl"),
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shr => return Some(~"shr"),
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lt => return Some(~"lt"),
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le => return Some(~"le"),
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ge => return Some(~"ge"),
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gt => return Some(~"gt"),
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eq => return Some(~"eq"),
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ne => return Some(~"ne"),
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and | or => return None
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}
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}
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pub fn lazy_binop(b: binop) -> bool {
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match b {
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and => true,
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or => true,
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_ => false
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}
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}
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pub fn is_shift_binop(b: binop) -> bool {
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match b {
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shl => true,
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shr => true,
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_ => false
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}
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}
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pub fn unop_to_str(op: unop) -> ~str {
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match op {
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box(mt) => if mt == m_mutbl { ~"@mut " } else { ~"@" },
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uniq(mt) => if mt == m_mutbl { ~"~mut " } else { ~"~" },
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deref => ~"*",
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not => ~"!",
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neg => ~"-"
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}
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}
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pub fn is_path(e: @expr) -> bool {
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return match e.node { expr_path(_) => true, _ => false };
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}
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pub fn int_ty_to_str(t: int_ty) -> ~str {
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match t {
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ty_char => ~"u8", // ???
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ty_i => ~"",
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ty_i8 => ~"i8",
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ty_i16 => ~"i16",
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ty_i32 => ~"i32",
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ty_i64 => ~"i64"
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}
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}
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pub fn int_ty_max(t: int_ty) -> u64 {
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match t {
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ty_i8 => 0x80u64,
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ty_i16 => 0x8000u64,
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ty_i | ty_char | ty_i32 => 0x80000000u64, // actually ni about ty_i
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ty_i64 => 0x8000000000000000u64
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}
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}
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pub fn uint_ty_to_str(t: uint_ty) -> ~str {
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match t {
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ty_u => ~"u",
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ty_u8 => ~"u8",
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ty_u16 => ~"u16",
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ty_u32 => ~"u32",
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ty_u64 => ~"u64"
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}
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}
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pub fn uint_ty_max(t: uint_ty) -> u64 {
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match t {
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ty_u8 => 0xffu64,
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ty_u16 => 0xffffu64,
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ty_u | ty_u32 => 0xffffffffu64, // actually ni about ty_u
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ty_u64 => 0xffffffffffffffffu64
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}
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}
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pub fn float_ty_to_str(t: float_ty) -> ~str {
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match t { ty_f => ~"f", ty_f32 => ~"f32", ty_f64 => ~"f64" }
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}
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pub fn is_call_expr(e: @expr) -> bool {
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match e.node { expr_call(*) => true, _ => false }
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}
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// This makes def_id hashable
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impl to_bytes::IterBytes for def_id {
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#[inline]
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fn iter_bytes(&self, lsb0: bool, f: to_bytes::Cb) -> bool {
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self.crate.iter_bytes(lsb0, f) && self.node.iter_bytes(lsb0, f)
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}
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}
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pub fn block_from_expr(e: @expr) -> blk {
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let blk_ = default_block(~[], option::Some::<@expr>(e), e.id);
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return spanned {node: blk_, span: e.span};
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}
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pub fn default_block(
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stmts1: ~[@stmt],
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expr1: Option<@expr>,
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id1: node_id
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) -> blk_ {
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ast::blk_ {
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view_items: ~[],
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stmts: stmts1,
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expr: expr1,
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id: id1,
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rules: default_blk,
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}
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}
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pub fn ident_to_path(s: span, i: ident) -> @Path {
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@ast::Path { span: s,
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global: false,
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idents: ~[i],
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rp: None,
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types: ~[] }
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}
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pub fn ident_to_pat(id: node_id, s: span, i: ident) -> @pat {
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@ast::pat { id: id,
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node: pat_ident(bind_infer, ident_to_path(s, i), None),
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span: s }
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}
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pub fn is_unguarded(a: &arm) -> bool {
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match a.guard {
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None => true,
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_ => false
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}
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}
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pub fn unguarded_pat(a: &arm) -> Option<~[@pat]> {
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if is_unguarded(a) { Some(/* FIXME (#2543) */ copy a.pats) } else { None }
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}
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pub fn public_methods(ms: ~[@method]) -> ~[@method] {
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do ms.filtered |m| {
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match m.vis {
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public => true,
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_ => false
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}
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}
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}
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// extract a ty_method from a trait_method. if the trait_method is
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// a default, pull out the useful fields to make a ty_method
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pub fn trait_method_to_ty_method(method: &trait_method) -> ty_method {
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match *method {
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required(ref m) => copy *m,
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provided(ref m) => {
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ty_method {
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ident: m.ident,
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attrs: copy m.attrs,
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purity: m.purity,
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decl: copy m.decl,
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generics: copy m.generics,
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explicit_self: m.explicit_self,
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id: m.id,
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span: m.span,
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}
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}
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}
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}
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pub fn split_trait_methods(trait_methods: &[trait_method])
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-> (~[ty_method], ~[@method]) {
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let mut reqd = ~[];
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let mut provd = ~[];
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for trait_methods.iter().advance |trt_method| {
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match *trt_method {
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required(ref tm) => reqd.push(copy *tm),
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provided(m) => provd.push(m)
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}
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};
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(reqd, provd)
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}
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pub fn struct_field_visibility(field: ast::struct_field) -> visibility {
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match field.node.kind {
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ast::named_field(_, visibility) => visibility,
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ast::unnamed_field => ast::public
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}
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}
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pub trait inlined_item_utils {
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fn ident(&self) -> ident;
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fn id(&self) -> ast::node_id;
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fn accept<E: Copy>(&self, e: E, v: visit::vt<E>);
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}
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impl inlined_item_utils for inlined_item {
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fn ident(&self) -> ident {
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match *self {
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ii_item(i) => /* FIXME (#2543) */ copy i.ident,
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ii_foreign(i) => /* FIXME (#2543) */ copy i.ident,
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ii_method(_, m) => /* FIXME (#2543) */ copy m.ident,
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}
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}
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fn id(&self) -> ast::node_id {
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match *self {
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ii_item(i) => i.id,
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ii_foreign(i) => i.id,
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ii_method(_, m) => m.id,
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}
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}
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fn accept<E: Copy>(&self, e: E, v: visit::vt<E>) {
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match *self {
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ii_item(i) => (v.visit_item)(i, (e, v)),
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ii_foreign(i) => (v.visit_foreign_item)(i, (e, v)),
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ii_method(_, m) => visit::visit_method_helper(m, (e, v)),
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}
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}
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}
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/* True if d is either a def_self, or a chain of def_upvars
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referring to a def_self */
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pub fn is_self(d: ast::def) -> bool {
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match d {
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def_self(*) => true,
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def_upvar(_, d, _, _) => is_self(*d),
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_ => false
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}
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}
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/// Maps a binary operator to its precedence
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pub fn operator_prec(op: ast::binop) -> uint {
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match op {
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mul | div | rem => 12u,
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// 'as' sits between here with 11
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add | subtract => 10u,
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shl | shr => 9u,
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bitand => 8u,
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bitxor => 7u,
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bitor => 6u,
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lt | le | ge | gt => 4u,
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eq | ne => 3u,
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and => 2u,
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or => 1u
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}
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}
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/// Precedence of the `as` operator, which is a binary operator
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/// not appearing in the prior table.
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pub static as_prec: uint = 11u;
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pub fn empty_generics() -> Generics {
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Generics {lifetimes: opt_vec::Empty,
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ty_params: opt_vec::Empty}
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}
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// ______________________________________________________________________
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// Enumerating the IDs which appear in an AST
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#[deriving(Encodable, Decodable)]
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pub struct id_range {
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min: node_id,
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max: node_id,
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}
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impl id_range {
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pub fn max() -> id_range {
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id_range {
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min: int::max_value,
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max: int::min_value,
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}
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}
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pub fn empty(&self) -> bool {
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self.min >= self.max
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}
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pub fn add(&mut self, id: node_id) {
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self.min = int::min(self.min, id);
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self.max = int::max(self.max, id + 1);
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}
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}
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pub fn id_visitor<T: Copy>(vfn: @fn(node_id, T)) -> visit::vt<T> {
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let visit_generics: @fn(&Generics, T) = |generics, t| {
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for generics.ty_params.iter().advance |p| {
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vfn(p.id, copy t);
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}
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for generics.lifetimes.iter().advance |p| {
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vfn(p.id, copy t);
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}
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};
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visit::mk_vt(@visit::Visitor {
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visit_mod: |m, sp, id, (t, vt)| {
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vfn(id, copy t);
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visit::visit_mod(m, sp, id, (t, vt));
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},
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visit_view_item: |vi, (t, vt)| {
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match vi.node {
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view_item_extern_mod(_, _, id) => vfn(id, copy t),
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view_item_use(ref vps) => {
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for vps.iter().advance |vp| {
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match vp.node {
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view_path_simple(_, _, id) => vfn(id, copy t),
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view_path_glob(_, id) => vfn(id, copy t),
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view_path_list(_, ref paths, id) => {
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vfn(id, copy t);
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for paths.iter().advance |p| {
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vfn(p.node.id, copy t);
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}
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}
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}
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}
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}
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}
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visit::visit_view_item(vi, (t, vt));
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},
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visit_foreign_item: |ni, (t, vt)| {
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vfn(ni.id, copy t);
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visit::visit_foreign_item(ni, (t, vt));
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},
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visit_item: |i, (t, vt)| {
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vfn(i.id, copy t);
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match i.node {
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item_enum(ref enum_definition, _) =>
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for (*enum_definition).variants.iter().advance |v| { vfn(v.node.id, copy t); },
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_ => ()
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}
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visit::visit_item(i, (t, vt));
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},
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visit_local: |l, (t, vt)| {
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vfn(l.node.id, copy t);
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visit::visit_local(l, (t, vt));
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},
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visit_block: |b, (t, vt)| {
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vfn(b.node.id, copy t);
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visit::visit_block(b, (t, vt));
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},
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visit_stmt: |s, (t, vt)| {
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vfn(ast_util::stmt_id(s), copy t);
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visit::visit_stmt(s, (t, vt));
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},
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visit_pat: |p, (t, vt)| {
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vfn(p.id, copy t);
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visit::visit_pat(p, (t, vt));
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},
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visit_expr: |e, (t, vt)| {
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{
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let r = e.get_callee_id();
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for r.iter().advance |callee_id| {
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vfn(*callee_id, copy t);
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}
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}
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vfn(e.id, copy t);
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visit::visit_expr(e, (t, vt));
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},
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visit_ty: |ty, (t, vt)| {
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match ty.node {
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ty_path(_, _, id) => vfn(id, copy t),
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_ => { /* fall through */ }
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}
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visit::visit_ty(ty, (t, vt));
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},
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visit_generics: |generics, (t, vt)| {
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visit_generics(generics, copy t);
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visit::visit_generics(generics, (t, vt));
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},
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visit_fn: |fk, d, a, b, id, (t, vt)| {
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vfn(id, copy t);
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match *fk {
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visit::fk_item_fn(_, generics, _, _) => {
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visit_generics(generics, copy t);
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}
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visit::fk_method(_, generics, m) => {
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vfn(m.self_id, copy t);
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visit_generics(generics, copy t);
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}
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visit::fk_anon(_) |
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visit::fk_fn_block => {
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}
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}
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for d.inputs.iter().advance |arg| {
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vfn(arg.id, copy t)
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}
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visit::visit_fn(fk, d, a, b, id, (copy t, vt));
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},
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visit_struct_field: |f, (t, vt)| {
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vfn(f.node.id, copy t);
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visit::visit_struct_field(f, (t, vt));
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},
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.. *visit::default_visitor()
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})
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}
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pub fn visit_ids_for_inlined_item(item: &inlined_item, vfn: @fn(node_id)) {
|
|
item.accept((), id_visitor(|id, ()| vfn(id)));
|
|
}
|
|
|
|
pub fn compute_id_range(visit_ids_fn: &fn(@fn(node_id))) -> id_range {
|
|
let result = @mut id_range::max();
|
|
do visit_ids_fn |id| {
|
|
result.add(id);
|
|
}
|
|
*result
|
|
}
|
|
|
|
pub fn compute_id_range_for_inlined_item(item: &inlined_item) -> id_range {
|
|
compute_id_range(|f| visit_ids_for_inlined_item(item, f))
|
|
}
|
|
|
|
pub fn is_item_impl(item: @ast::item) -> bool {
|
|
match item.node {
|
|
item_impl(*) => true,
|
|
_ => false
|
|
}
|
|
}
|
|
|
|
pub fn walk_pat(pat: @pat, it: &fn(@pat) -> bool) -> bool {
|
|
if !it(pat) {
|
|
return false;
|
|
}
|
|
|
|
match pat.node {
|
|
pat_ident(_, _, Some(p)) => walk_pat(p, it),
|
|
pat_struct(_, ref fields, _) => {
|
|
fields.iter().advance(|f| walk_pat(f.pat, it))
|
|
}
|
|
pat_enum(_, Some(ref s)) | pat_tup(ref s) => {
|
|
s.iter().advance(|&p| walk_pat(p, it))
|
|
}
|
|
pat_box(s) | pat_uniq(s) | pat_region(s) => {
|
|
walk_pat(s, it)
|
|
}
|
|
pat_vec(ref before, ref slice, ref after) => {
|
|
before.iter().advance(|&p| walk_pat(p, it)) &&
|
|
slice.iter().advance(|&p| walk_pat(p, it)) &&
|
|
after.iter().advance(|&p| walk_pat(p, it))
|
|
}
|
|
pat_wild | pat_lit(_) | pat_range(_, _) | pat_ident(_, _, _) |
|
|
pat_enum(_, _) => {
|
|
true
|
|
}
|
|
}
|
|
}
|
|
|
|
pub trait EachViewItem {
|
|
pub fn each_view_item(&self, f: @fn(@ast::view_item) -> bool) -> bool;
|
|
}
|
|
|
|
impl EachViewItem for ast::crate {
|
|
fn each_view_item(&self, f: @fn(@ast::view_item) -> bool) -> bool {
|
|
let broke = @mut false;
|
|
let vtor: visit::vt<()> = visit::mk_simple_visitor(@visit::SimpleVisitor {
|
|
visit_view_item: |vi| { *broke = f(vi); }, ..*visit::default_simple_visitor()
|
|
});
|
|
visit::visit_crate(self, ((), vtor));
|
|
true
|
|
}
|
|
}
|
|
|
|
pub fn view_path_id(p: @view_path) -> node_id {
|
|
match p.node {
|
|
view_path_simple(_, _, id) |
|
|
view_path_glob(_, id) |
|
|
view_path_list(_, _, id) => id
|
|
}
|
|
}
|
|
|
|
/// Returns true if the given struct def is tuple-like; i.e. that its fields
|
|
/// are unnamed.
|
|
pub fn struct_def_is_tuple_like(struct_def: @ast::struct_def) -> bool {
|
|
struct_def.ctor_id.is_some()
|
|
}
|
|
|
|
pub fn visibility_to_privacy(visibility: visibility) -> Privacy {
|
|
match visibility {
|
|
public => Public,
|
|
inherited | private => Private
|
|
}
|
|
}
|
|
|
|
pub fn variant_visibility_to_privacy(visibility: visibility,
|
|
enclosing_is_public: bool)
|
|
-> Privacy {
|
|
if enclosing_is_public {
|
|
match visibility {
|
|
public | inherited => Public,
|
|
private => Private
|
|
}
|
|
} else {
|
|
visibility_to_privacy(visibility)
|
|
}
|
|
}
|
|
|
|
#[deriving(Eq)]
|
|
pub enum Privacy {
|
|
Private,
|
|
Public
|
|
}
|
|
|
|
// HYGIENE FUNCTIONS
|
|
|
|
/// Construct an identifier with the given name and an empty context:
|
|
pub fn new_ident(name: Name) -> ident { ident {name: name, ctxt: 0}}
|
|
|
|
/// Extend a syntax context with a given mark
|
|
pub fn new_mark(m:Mrk, tail:SyntaxContext) -> SyntaxContext {
|
|
new_mark_internal(m,tail,get_sctable())
|
|
}
|
|
|
|
// Extend a syntax context with a given mark and table
|
|
// FIXME #4536 : currently pub to allow testing
|
|
pub fn new_mark_internal(m:Mrk, tail:SyntaxContext,table:&mut SCTable)
|
|
-> SyntaxContext {
|
|
let key = (tail,m);
|
|
// FIXME #5074 : can't use more natural style because we're missing
|
|
// flow-sensitivity. Results in two lookups on a hash table hit.
|
|
// also applies to new_rename_internal, below.
|
|
// let try_lookup = table.mark_memo.find(&key);
|
|
match table.mark_memo.contains_key(&key) {
|
|
false => {
|
|
let new_idx = idx_push(&mut table.table,Mark(m,tail));
|
|
table.mark_memo.insert(key,new_idx);
|
|
new_idx
|
|
}
|
|
true => {
|
|
match table.mark_memo.find(&key) {
|
|
None => fail!(~"internal error: key disappeared 2013042901"),
|
|
Some(idxptr) => {*idxptr}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Extend a syntax context with a given rename
|
|
pub fn new_rename(id:ident, to:Name, tail:SyntaxContext) -> SyntaxContext {
|
|
new_rename_internal(id, to, tail, get_sctable())
|
|
}
|
|
|
|
// Extend a syntax context with a given rename and sctable
|
|
// FIXME #4536 : currently pub to allow testing
|
|
pub fn new_rename_internal(id:ident, to:Name, tail:SyntaxContext, table: &mut SCTable)
|
|
-> SyntaxContext {
|
|
let key = (tail,id,to);
|
|
// FIXME #5074
|
|
//let try_lookup = table.rename_memo.find(&key);
|
|
match table.rename_memo.contains_key(&key) {
|
|
false => {
|
|
let new_idx = idx_push(&mut table.table,Rename(id,to,tail));
|
|
table.rename_memo.insert(key,new_idx);
|
|
new_idx
|
|
}
|
|
true => {
|
|
match table.rename_memo.find(&key) {
|
|
None => fail!(~"internal error: key disappeared 2013042902"),
|
|
Some(idxptr) => {*idxptr}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Make a fresh syntax context table with EmptyCtxt in slot zero
|
|
/// and IllegalCtxt in slot one.
|
|
// FIXME #4536 : currently pub to allow testing
|
|
pub fn new_sctable_internal() -> SCTable {
|
|
SCTable {
|
|
table: ~[EmptyCtxt,IllegalCtxt],
|
|
mark_memo: HashMap::new(),
|
|
rename_memo: HashMap::new()
|
|
}
|
|
}
|
|
|
|
// fetch the SCTable from TLS, create one if it doesn't yet exist.
|
|
pub fn get_sctable() -> @mut SCTable {
|
|
unsafe {
|
|
let sctable_key = (cast::transmute::<(uint, uint),
|
|
&fn(v: @@mut SCTable)>(
|
|
(-4 as uint, 0u)));
|
|
match local_data::local_data_get(sctable_key) {
|
|
None => {
|
|
let new_table = @@mut new_sctable_internal();
|
|
local_data::local_data_set(sctable_key,new_table);
|
|
*new_table
|
|
},
|
|
Some(intr) => *intr
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Add a value to the end of a vec, return its index
|
|
fn idx_push<T>(vec: &mut ~[T], val: T) -> uint {
|
|
vec.push(val);
|
|
vec.len() - 1
|
|
}
|
|
|
|
/// Resolve a syntax object to a name, per MTWT.
|
|
pub fn resolve(id : ident) -> Name {
|
|
resolve_internal(id, get_sctable())
|
|
}
|
|
|
|
// Resolve a syntax object to a name, per MTWT.
|
|
// FIXME #4536 : currently pub to allow testing
|
|
pub fn resolve_internal(id : ident, table : &mut SCTable) -> Name {
|
|
match table.table[id.ctxt] {
|
|
EmptyCtxt => id.name,
|
|
// ignore marks here:
|
|
Mark(_,subctxt) => resolve_internal(ident{name:id.name, ctxt: subctxt},table),
|
|
// do the rename if necessary:
|
|
Rename(ident{name,ctxt},toname,subctxt) => {
|
|
// this could be cached or computed eagerly:
|
|
let resolvedfrom = resolve_internal(ident{name:name,ctxt:ctxt},table);
|
|
let resolvedthis = resolve_internal(ident{name:id.name,ctxt:subctxt},table);
|
|
if ((resolvedthis == resolvedfrom)
|
|
&& (marksof(ctxt,resolvedthis,table)
|
|
== marksof(subctxt,resolvedthis,table))) {
|
|
toname
|
|
} else {
|
|
resolvedthis
|
|
}
|
|
}
|
|
IllegalCtxt() => fail!(~"expected resolvable context, got IllegalCtxt")
|
|
}
|
|
}
|
|
|
|
/// Compute the marks associated with a syntax context.
|
|
// it's not clear to me whether it's better to use a [] mutable
|
|
// vector or a cons-list for this.
|
|
pub fn marksof(ctxt: SyntaxContext, stopname: Name, table: &SCTable) -> ~[Mrk] {
|
|
let mut result = ~[];
|
|
let mut loopvar = ctxt;
|
|
loop {
|
|
match table.table[loopvar] {
|
|
EmptyCtxt => {return result;},
|
|
Mark(mark,tl) => {
|
|
xorPush(&mut result,mark);
|
|
loopvar = tl;
|
|
},
|
|
Rename(_,name,tl) => {
|
|
// see MTWT for details on the purpose of the stopname.
|
|
// short version: it prevents duplication of effort.
|
|
if (name == stopname) {
|
|
return result;
|
|
} else {
|
|
loopvar = tl;
|
|
}
|
|
}
|
|
IllegalCtxt => fail!(~"expected resolvable context, got IllegalCtxt")
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Push a name... unless it matches the one on top, in which
|
|
/// case pop and discard (so two of the same marks cancel)
|
|
pub fn xorPush(marks: &mut ~[uint], mark: uint) {
|
|
if ((marks.len() > 0) && (getLast(marks) == mark)) {
|
|
marks.pop();
|
|
} else {
|
|
marks.push(mark);
|
|
}
|
|
}
|
|
|
|
// get the last element of a mutable array.
|
|
// FIXME #4903: , must be a separate procedure for now.
|
|
pub fn getLast(arr: &~[Mrk]) -> uint {
|
|
*arr.last()
|
|
}
|
|
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use ast::*;
|
|
use super::*;
|
|
use std::io;
|
|
|
|
#[test] fn xorpush_test () {
|
|
let mut s = ~[];
|
|
xorPush(&mut s,14);
|
|
assert_eq!(copy s,~[14]);
|
|
xorPush(&mut s,14);
|
|
assert_eq!(copy s,~[]);
|
|
xorPush(&mut s,14);
|
|
assert_eq!(copy s,~[14]);
|
|
xorPush(&mut s,15);
|
|
assert_eq!(copy s,~[14,15]);
|
|
xorPush (&mut s,16);
|
|
assert_eq!(copy s,~[14,15,16]);
|
|
xorPush (&mut s,16);
|
|
assert_eq!(copy s,~[14,15]);
|
|
xorPush (&mut s,15);
|
|
assert_eq!(copy s,~[14]);
|
|
}
|
|
|
|
// convert a list of uints to an @[ident]
|
|
// (ignores the interner completely)
|
|
fn uints_to_idents (uints: &~[uint]) -> @~[ident] {
|
|
@uints.map(|u|{ ident {name:*u, ctxt: empty_ctxt} })
|
|
}
|
|
|
|
fn id (u : uint, s: SyntaxContext) -> ident {
|
|
ident{name:u, ctxt: s}
|
|
}
|
|
|
|
// because of the SCTable, I now need a tidy way of
|
|
// creating syntax objects. Sigh.
|
|
#[deriving(Eq)]
|
|
enum TestSC {
|
|
M(Mrk),
|
|
R(ident,Name)
|
|
}
|
|
|
|
// unfold a vector of TestSC values into a SCTable,
|
|
// returning the resulting index
|
|
fn unfold_test_sc(tscs : ~[TestSC], tail: SyntaxContext, table : &mut SCTable)
|
|
-> SyntaxContext {
|
|
tscs.rev_iter().fold(tail, |tail : SyntaxContext, tsc : &TestSC|
|
|
{match *tsc {
|
|
M(mrk) => new_mark_internal(mrk,tail,table),
|
|
R(ident,name) => new_rename_internal(ident,name,tail,table)}})
|
|
}
|
|
|
|
// gather a SyntaxContext back into a vector of TestSCs
|
|
fn refold_test_sc(mut sc: SyntaxContext, table : &SCTable) -> ~[TestSC] {
|
|
let mut result = ~[];
|
|
loop {
|
|
match table.table[sc] {
|
|
EmptyCtxt => {return result;},
|
|
Mark(mrk,tail) => {
|
|
result.push(M(mrk));
|
|
sc = tail;
|
|
loop;
|
|
},
|
|
Rename(id,name,tail) => {
|
|
result.push(R(id,name));
|
|
sc = tail;
|
|
loop;
|
|
}
|
|
IllegalCtxt => fail!("expected resolvable context, got IllegalCtxt")
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test] fn test_unfold_refold(){
|
|
let mut t = new_sctable_internal();
|
|
|
|
let test_sc = ~[M(3),R(id(101,0),14),M(9)];
|
|
assert_eq!(unfold_test_sc(copy test_sc,empty_ctxt,&mut t),4);
|
|
assert_eq!(t.table[2],Mark(9,0));
|
|
assert_eq!(t.table[3],Rename(id(101,0),14,2));
|
|
assert_eq!(t.table[4],Mark(3,3));
|
|
assert_eq!(refold_test_sc(4,&t),test_sc);
|
|
}
|
|
|
|
// extend a syntax context with a sequence of marks given
|
|
// in a vector. v[0] will be the outermost mark.
|
|
fn unfold_marks(mrks:~[Mrk],tail:SyntaxContext,table: &mut SCTable) -> SyntaxContext {
|
|
mrks.rev_iter().fold(tail, |tail:SyntaxContext, mrk:&Mrk|
|
|
{new_mark_internal(*mrk,tail,table)})
|
|
}
|
|
|
|
#[test] fn unfold_marks_test() {
|
|
let mut t = new_sctable_internal();
|
|
|
|
assert_eq!(unfold_marks(~[3,7],empty_ctxt,&mut t),3);
|
|
assert_eq!(t.table[2],Mark(7,0));
|
|
assert_eq!(t.table[3],Mark(3,2));
|
|
}
|
|
|
|
#[test] fn test_marksof () {
|
|
let stopname = 242;
|
|
let name1 = 243;
|
|
let mut t = new_sctable_internal();
|
|
assert_eq!(marksof (empty_ctxt,stopname,&t),~[]);
|
|
// FIXME #5074: ANF'd to dodge nested calls
|
|
{ let ans = unfold_marks(~[4,98],empty_ctxt,&mut t);
|
|
assert_eq! (marksof (ans,stopname,&t),~[4,98]);}
|
|
// does xoring work?
|
|
{ let ans = unfold_marks(~[5,5,16],empty_ctxt,&mut t);
|
|
assert_eq! (marksof (ans,stopname,&t), ~[16]);}
|
|
// does nested xoring work?
|
|
{ let ans = unfold_marks(~[5,10,10,5,16],empty_ctxt,&mut t);
|
|
assert_eq! (marksof (ans, stopname,&t), ~[16]);}
|
|
// rename where stop doesn't match:
|
|
{ let chain = ~[M(9),
|
|
R(id(name1,
|
|
new_mark_internal (4, empty_ctxt,&mut t)),
|
|
100101102),
|
|
M(14)];
|
|
let ans = unfold_test_sc(chain,empty_ctxt,&mut t);
|
|
assert_eq! (marksof (ans, stopname, &t), ~[9,14]);}
|
|
// rename where stop does match
|
|
{ let name1sc = new_mark_internal(4, empty_ctxt, &mut t);
|
|
let chain = ~[M(9),
|
|
R(id(name1, name1sc),
|
|
stopname),
|
|
M(14)];
|
|
let ans = unfold_test_sc(chain,empty_ctxt,&mut t);
|
|
assert_eq! (marksof (ans, stopname, &t), ~[9]); }
|
|
}
|
|
|
|
|
|
#[test] fn resolve_tests () {
|
|
let a = 40;
|
|
let mut t = new_sctable_internal();
|
|
// - ctxt is MT
|
|
assert_eq!(resolve_internal(id(a,empty_ctxt),&mut t),a);
|
|
// - simple ignored marks
|
|
{ let sc = unfold_marks(~[1,2,3],empty_ctxt,&mut t);
|
|
assert_eq!(resolve_internal(id(a,sc),&mut t),a);}
|
|
// - orthogonal rename where names don't match
|
|
{ let sc = unfold_test_sc(~[R(id(50,empty_ctxt),51),M(12)],empty_ctxt,&mut t);
|
|
assert_eq!(resolve_internal(id(a,sc),&mut t),a);}
|
|
// - rename where names do match, but marks don't
|
|
{ let sc1 = new_mark_internal(1,empty_ctxt,&mut t);
|
|
let sc = unfold_test_sc(~[R(id(a,sc1),50),
|
|
M(1),
|
|
M(2)],
|
|
empty_ctxt,&mut t);
|
|
assert_eq!(resolve_internal(id(a,sc),&mut t), a);}
|
|
// - rename where names and marks match
|
|
{ let sc1 = unfold_test_sc(~[M(1),M(2)],empty_ctxt,&mut t);
|
|
let sc = unfold_test_sc(~[R(id(a,sc1),50),M(1),M(2)],empty_ctxt,&mut t);
|
|
assert_eq!(resolve_internal(id(a,sc),&mut t), 50); }
|
|
// - rename where names and marks match by literal sharing
|
|
{ let sc1 = unfold_test_sc(~[M(1),M(2)],empty_ctxt,&mut t);
|
|
let sc = unfold_test_sc(~[R(id(a,sc1),50)],sc1,&mut t);
|
|
assert_eq!(resolve_internal(id(a,sc),&mut t), 50); }
|
|
// - two renames of the same var.. can only happen if you use
|
|
// local-expand to prevent the inner binding from being renamed
|
|
// during the rename-pass caused by the first:
|
|
io::println("about to run bad test");
|
|
{ let sc = unfold_test_sc(~[R(id(a,empty_ctxt),50),
|
|
R(id(a,empty_ctxt),51)],
|
|
empty_ctxt,&mut t);
|
|
assert_eq!(resolve_internal(id(a,sc),&mut t), 51); }
|
|
// the simplest double-rename:
|
|
{ let a_to_a50 = new_rename_internal(id(a,empty_ctxt),50,empty_ctxt,&mut t);
|
|
let a50_to_a51 = new_rename_internal(id(a,a_to_a50),51,a_to_a50,&mut t);
|
|
assert_eq!(resolve_internal(id(a,a50_to_a51),&mut t),51);
|
|
// mark on the outside doesn't stop rename:
|
|
let sc = new_mark_internal(9,a50_to_a51,&mut t);
|
|
assert_eq!(resolve_internal(id(a,sc),&mut t),51);
|
|
// but mark on the inside does:
|
|
let a50_to_a51_b = unfold_test_sc(~[R(id(a,a_to_a50),51),
|
|
M(9)],
|
|
a_to_a50,
|
|
&mut t);
|
|
assert_eq!(resolve_internal(id(a,a50_to_a51_b),&mut t),50);}
|
|
}
|
|
|
|
#[test] fn hashing_tests () {
|
|
let mut t = new_sctable_internal();
|
|
assert_eq!(new_mark_internal(12,empty_ctxt,&mut t),2);
|
|
assert_eq!(new_mark_internal(13,empty_ctxt,&mut t),3);
|
|
// using the same one again should result in the same index:
|
|
assert_eq!(new_mark_internal(12,empty_ctxt,&mut t),2);
|
|
// I'm assuming that the rename table will behave the same....
|
|
}
|
|
|
|
}
|