265a23320d
Note: Do not merge until we get a newer snapshot that includes #21374 There was some type inference fallout (see 4th commit) because type inference with `a..b` is not as good as with `range(a, b)` (see #21672). r? @alexcrichton
759 lines
22 KiB
Rust
759 lines
22 KiB
Rust
// Copyright 2012-2014 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 abi::Abi;
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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;
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use codemap::Span;
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use owned_slice::OwnedSlice;
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use parse::token;
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use print::pprust;
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use ptr::P;
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use visit::Visitor;
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use visit;
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use std::cmp;
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use std::u32;
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pub fn path_name_i(idents: &[Ident]) -> String {
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// FIXME: Bad copies (#2543 -- same for everything else that says "bad")
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idents.iter().map(|i| {
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token::get_ident(*i).get().to_string()
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}).collect::<Vec<String>>().connect("::")
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}
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pub fn local_def(id: NodeId) -> DefId {
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ast::DefId { krate: LOCAL_CRATE, node: id }
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}
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pub fn is_local(did: ast::DefId) -> bool { did.krate == LOCAL_CRATE }
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pub fn stmt_id(s: &Stmt) -> NodeId {
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match s.node {
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StmtDecl(_, id) => id,
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StmtExpr(_, id) => id,
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StmtSemi(_, id) => id,
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StmtMac(..) => panic!("attempted to analyze unexpanded stmt")
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}
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}
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pub fn binop_to_string(op: BinOp_) -> &'static str {
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match op {
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BiAdd => "+",
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BiSub => "-",
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BiMul => "*",
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BiDiv => "/",
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BiRem => "%",
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BiAnd => "&&",
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BiOr => "||",
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BiBitXor => "^",
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BiBitAnd => "&",
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BiBitOr => "|",
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BiShl => "<<",
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BiShr => ">>",
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BiEq => "==",
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BiLt => "<",
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BiLe => "<=",
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BiNe => "!=",
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BiGe => ">=",
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BiGt => ">"
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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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BiAnd => true,
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BiOr => 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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BiShl => true,
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BiShr => true,
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_ => false
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}
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}
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pub fn is_comparison_binop(b: BinOp_) -> bool {
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match b {
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BiEq | BiLt | BiLe | BiNe | BiGt | BiGe => true,
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_ => false
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}
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}
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/// Returns `true` if the binary operator takes its arguments by value
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pub fn is_by_value_binop(b: BinOp_) -> bool {
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match b {
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BiAdd | BiSub | BiMul | BiDiv | BiRem | BiBitXor | BiBitAnd | BiBitOr | BiShl | BiShr => {
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true
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}
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_ => false
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}
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}
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/// Returns `true` if the unary operator takes its argument by value
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pub fn is_by_value_unop(u: UnOp) -> bool {
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match u {
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UnNeg | UnNot => true,
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_ => false,
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}
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}
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pub fn unop_to_string(op: UnOp) -> &'static str {
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match op {
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UnUniq => "box() ",
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UnDeref => "*",
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UnNot => "!",
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UnNeg => "-",
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}
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}
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pub fn is_path(e: P<Expr>) -> bool {
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return match e.node { ExprPath(_) => true, _ => false };
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}
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/// Get a string representation of a signed int type, with its value.
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/// We want to avoid "45int" and "-3int" in favor of "45" and "-3"
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pub fn int_ty_to_string(t: IntTy, val: Option<i64>) -> String {
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let s = match t {
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TyIs(true) if val.is_some() => "i",
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TyIs(true) => "int",
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TyIs(false) if val.is_some() => "is",
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TyIs(false) => "isize",
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TyI8 => "i8",
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TyI16 => "i16",
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TyI32 => "i32",
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TyI64 => "i64"
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};
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match val {
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// cast to a u64 so we can correctly print INT64_MIN. All integral types
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// are parsed as u64, so we wouldn't want to print an extra negative
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// sign.
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Some(n) => format!("{}{}", n as u64, s),
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None => s.to_string()
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}
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}
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pub fn int_ty_max(t: IntTy) -> u64 {
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match t {
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TyI8 => 0x80u64,
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TyI16 => 0x8000u64,
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TyIs(_) | TyI32 => 0x80000000u64, // actually ni about TyIs
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TyI64 => 0x8000000000000000u64
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}
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}
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/// Get a string representation of an unsigned int type, with its value.
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/// We want to avoid "42u" in favor of "42us". "42uint" is right out.
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pub fn uint_ty_to_string(t: UintTy, val: Option<u64>) -> String {
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let s = match t {
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TyUs(true) if val.is_some() => "u",
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TyUs(true) => "uint",
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TyUs(false) if val.is_some() => "us",
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TyUs(false) => "usize",
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TyU8 => "u8",
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TyU16 => "u16",
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TyU32 => "u32",
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TyU64 => "u64"
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};
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match val {
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Some(n) => format!("{}{}", n, s),
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None => s.to_string()
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}
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}
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pub fn uint_ty_max(t: UintTy) -> u64 {
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match t {
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TyU8 => 0xffu64,
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TyU16 => 0xffffu64,
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TyUs(_) | TyU32 => 0xffffffffu64, // actually ni about TyUs
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TyU64 => 0xffffffffffffffffu64
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}
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}
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pub fn float_ty_to_string(t: FloatTy) -> String {
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match t {
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TyF32 => "f32".to_string(),
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TyF64 => "f64".to_string(),
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}
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}
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// convert a span and an identifier to the corresponding
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// 1-segment path
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pub fn ident_to_path(s: Span, identifier: Ident) -> Path {
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ast::Path {
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span: s,
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global: false,
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segments: vec!(
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ast::PathSegment {
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identifier: identifier,
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parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
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lifetimes: Vec::new(),
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types: OwnedSlice::empty(),
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bindings: OwnedSlice::empty(),
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})
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}
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),
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}
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}
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// If path is a single segment ident path, return that ident. Otherwise, return
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// None.
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pub fn path_to_ident(path: &Path) -> Option<Ident> {
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if path.segments.len() != 1 {
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return None;
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}
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let segment = &path.segments[0];
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if !segment.parameters.is_empty() {
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return None;
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}
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Some(segment.identifier)
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}
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pub fn ident_to_pat(id: NodeId, s: Span, i: Ident) -> P<Pat> {
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P(Pat {
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id: id,
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node: PatIdent(BindByValue(MutImmutable), codemap::Spanned{span:s, node:i}, None),
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span: s
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})
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}
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pub fn name_to_dummy_lifetime(name: Name) -> Lifetime {
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Lifetime { id: DUMMY_NODE_ID,
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span: codemap::DUMMY_SP,
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name: name }
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}
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/// Generate a "pretty" name for an `impl` from its type and trait.
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/// This is designed so that symbols of `impl`'d methods give some
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/// hint of where they came from, (previously they would all just be
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/// listed as `__extensions__::method_name::hash`, with no indication
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/// of the type).
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pub fn impl_pretty_name(trait_ref: &Option<TraitRef>, ty: &Ty) -> Ident {
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let mut pretty = pprust::ty_to_string(ty);
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match *trait_ref {
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Some(ref trait_ref) => {
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pretty.push('.');
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pretty.push_str(&pprust::path_to_string(&trait_ref.path)[]);
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}
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None => {}
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}
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token::gensym_ident(&pretty[])
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}
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pub fn trait_method_to_ty_method(method: &Method) -> TypeMethod {
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match method.node {
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MethDecl(ident,
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ref generics,
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abi,
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ref explicit_self,
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unsafety,
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ref decl,
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_,
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vis) => {
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TypeMethod {
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ident: ident,
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attrs: method.attrs.clone(),
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unsafety: unsafety,
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decl: (*decl).clone(),
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generics: generics.clone(),
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explicit_self: (*explicit_self).clone(),
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id: method.id,
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span: method.span,
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vis: vis,
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abi: abi,
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}
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},
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MethMac(_) => panic!("expected non-macro method declaration")
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}
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}
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/// extract a TypeMethod from a TraitItem. if the TraitItem is
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/// a default, pull out the useful fields to make a TypeMethod
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//
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// NB: to be used only after expansion is complete, and macros are gone.
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pub fn trait_item_to_ty_method(method: &TraitItem) -> TypeMethod {
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match *method {
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RequiredMethod(ref m) => (*m).clone(),
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ProvidedMethod(ref m) => trait_method_to_ty_method(&**m),
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TypeTraitItem(_) => {
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panic!("trait_method_to_ty_method(): expected method but found \
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typedef")
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}
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}
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}
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pub fn split_trait_methods(trait_methods: &[TraitItem])
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-> (Vec<TypeMethod>, Vec<P<Method>> ) {
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let mut reqd = Vec::new();
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let mut provd = Vec::new();
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for trt_method in trait_methods.iter() {
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match *trt_method {
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RequiredMethod(ref tm) => reqd.push((*tm).clone()),
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ProvidedMethod(ref m) => provd.push((*m).clone()),
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TypeTraitItem(_) => {}
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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::StructField) -> Visibility {
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match field.node.kind {
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ast::NamedField(_, v) | ast::UnnamedField(v) => v
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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_) -> usize {
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match op {
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// 'as' sits here with 12
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BiMul | BiDiv | BiRem => 11us,
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BiAdd | BiSub => 10us,
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BiShl | BiShr => 9us,
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BiBitAnd => 8us,
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BiBitXor => 7us,
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BiBitOr => 6us,
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BiLt | BiLe | BiGe | BiGt | BiEq | BiNe => 3us,
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BiAnd => 2us,
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BiOr => 1us
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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 const AS_PREC: usize = 12us;
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pub fn empty_generics() -> Generics {
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Generics {
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lifetimes: Vec::new(),
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ty_params: OwnedSlice::empty(),
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where_clause: WhereClause {
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id: DUMMY_NODE_ID,
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predicates: Vec::new(),
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}
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}
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}
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// ______________________________________________________________________
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// Enumerating the IDs which appear in an AST
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#[derive(RustcEncodable, RustcDecodable, Debug, Copy)]
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pub struct IdRange {
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pub min: NodeId,
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pub max: NodeId,
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}
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impl IdRange {
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pub fn max() -> IdRange {
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IdRange {
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min: u32::MAX,
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max: u32::MIN,
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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: NodeId) {
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self.min = cmp::min(self.min, id);
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self.max = cmp::max(self.max, id + 1);
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}
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}
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pub trait IdVisitingOperation {
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fn visit_id(&mut self, node_id: NodeId);
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}
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/// A visitor that applies its operation to all of the node IDs
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/// in a visitable thing.
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pub struct IdVisitor<'a, O:'a> {
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pub operation: &'a mut O,
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pub pass_through_items: bool,
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pub visited_outermost: bool,
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}
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impl<'a, O: IdVisitingOperation> IdVisitor<'a, O> {
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fn visit_generics_helper(&mut self, generics: &Generics) {
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for type_parameter in generics.ty_params.iter() {
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self.operation.visit_id(type_parameter.id)
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}
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for lifetime in generics.lifetimes.iter() {
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self.operation.visit_id(lifetime.lifetime.id)
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}
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}
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}
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impl<'a, 'v, O: IdVisitingOperation> Visitor<'v> for IdVisitor<'a, O> {
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fn visit_mod(&mut self,
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module: &Mod,
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_: Span,
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node_id: NodeId) {
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self.operation.visit_id(node_id);
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visit::walk_mod(self, module)
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}
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fn visit_foreign_item(&mut self, foreign_item: &ForeignItem) {
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self.operation.visit_id(foreign_item.id);
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visit::walk_foreign_item(self, foreign_item)
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}
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fn visit_item(&mut self, item: &Item) {
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if !self.pass_through_items {
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if self.visited_outermost {
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return
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} else {
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self.visited_outermost = true
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}
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}
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self.operation.visit_id(item.id);
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match item.node {
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ItemUse(ref view_path) => {
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match view_path.node {
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ViewPathSimple(_, _) |
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ViewPathGlob(_) => {}
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ViewPathList(_, ref paths) => {
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for path in paths.iter() {
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self.operation.visit_id(path.node.id())
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}
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}
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}
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}
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ItemEnum(ref enum_definition, _) => {
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for variant in enum_definition.variants.iter() {
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self.operation.visit_id(variant.node.id)
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}
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}
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_ => {}
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}
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visit::walk_item(self, item);
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self.visited_outermost = false
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}
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fn visit_local(&mut self, local: &Local) {
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self.operation.visit_id(local.id);
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visit::walk_local(self, local)
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}
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fn visit_block(&mut self, block: &Block) {
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self.operation.visit_id(block.id);
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visit::walk_block(self, block)
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}
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fn visit_stmt(&mut self, statement: &Stmt) {
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self.operation.visit_id(ast_util::stmt_id(statement));
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visit::walk_stmt(self, statement)
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}
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fn visit_pat(&mut self, pattern: &Pat) {
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self.operation.visit_id(pattern.id);
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visit::walk_pat(self, pattern)
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}
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fn visit_expr(&mut self, expression: &Expr) {
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self.operation.visit_id(expression.id);
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visit::walk_expr(self, expression)
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}
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fn visit_ty(&mut self, typ: &Ty) {
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self.operation.visit_id(typ.id);
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if let TyPath(_, id) = typ.node {
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self.operation.visit_id(id);
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}
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visit::walk_ty(self, typ)
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}
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fn visit_generics(&mut self, generics: &Generics) {
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self.visit_generics_helper(generics);
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visit::walk_generics(self, generics)
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}
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fn visit_fn(&mut self,
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function_kind: visit::FnKind<'v>,
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function_declaration: &'v FnDecl,
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block: &'v Block,
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span: Span,
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node_id: NodeId) {
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if !self.pass_through_items {
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match function_kind {
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visit::FkMethod(..) if self.visited_outermost => return,
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visit::FkMethod(..) => self.visited_outermost = true,
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_ => {}
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}
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}
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self.operation.visit_id(node_id);
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match function_kind {
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visit::FkItemFn(_, generics, _, _) |
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visit::FkMethod(_, generics, _) => {
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self.visit_generics_helper(generics)
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}
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visit::FkFnBlock => {}
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}
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for argument in function_declaration.inputs.iter() {
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self.operation.visit_id(argument.id)
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}
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visit::walk_fn(self,
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function_kind,
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function_declaration,
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block,
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span);
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if !self.pass_through_items {
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if let visit::FkMethod(..) = function_kind {
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self.visited_outermost = false;
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}
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}
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}
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fn visit_struct_field(&mut self, struct_field: &StructField) {
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self.operation.visit_id(struct_field.node.id);
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visit::walk_struct_field(self, struct_field)
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}
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fn visit_struct_def(&mut self,
|
|
struct_def: &StructDef,
|
|
_: ast::Ident,
|
|
_: &ast::Generics,
|
|
id: NodeId) {
|
|
self.operation.visit_id(id);
|
|
struct_def.ctor_id.map(|ctor_id| self.operation.visit_id(ctor_id));
|
|
visit::walk_struct_def(self, struct_def);
|
|
}
|
|
|
|
fn visit_trait_item(&mut self, tm: &ast::TraitItem) {
|
|
match *tm {
|
|
ast::RequiredMethod(ref m) => self.operation.visit_id(m.id),
|
|
ast::ProvidedMethod(ref m) => self.operation.visit_id(m.id),
|
|
ast::TypeTraitItem(ref typ) => self.operation.visit_id(typ.ty_param.id),
|
|
}
|
|
visit::walk_trait_item(self, tm);
|
|
}
|
|
|
|
fn visit_lifetime_ref(&mut self, lifetime: &'v Lifetime) {
|
|
self.operation.visit_id(lifetime.id);
|
|
}
|
|
|
|
fn visit_lifetime_def(&mut self, def: &'v LifetimeDef) {
|
|
self.visit_lifetime_ref(&def.lifetime);
|
|
}
|
|
}
|
|
|
|
pub fn visit_ids_for_inlined_item<O: IdVisitingOperation>(item: &InlinedItem,
|
|
operation: &mut O) {
|
|
let mut id_visitor = IdVisitor {
|
|
operation: operation,
|
|
pass_through_items: true,
|
|
visited_outermost: false,
|
|
};
|
|
|
|
visit::walk_inlined_item(&mut id_visitor, item);
|
|
}
|
|
|
|
struct IdRangeComputingVisitor {
|
|
result: IdRange,
|
|
}
|
|
|
|
impl IdVisitingOperation for IdRangeComputingVisitor {
|
|
fn visit_id(&mut self, id: NodeId) {
|
|
self.result.add(id);
|
|
}
|
|
}
|
|
|
|
pub fn compute_id_range_for_inlined_item(item: &InlinedItem) -> IdRange {
|
|
let mut visitor = IdRangeComputingVisitor {
|
|
result: IdRange::max()
|
|
};
|
|
visit_ids_for_inlined_item(item, &mut visitor);
|
|
visitor.result
|
|
}
|
|
|
|
/// Computes the id range for a single fn body, ignoring nested items.
|
|
pub fn compute_id_range_for_fn_body(fk: visit::FnKind,
|
|
decl: &FnDecl,
|
|
body: &Block,
|
|
sp: Span,
|
|
id: NodeId)
|
|
-> IdRange
|
|
{
|
|
let mut visitor = IdRangeComputingVisitor {
|
|
result: IdRange::max()
|
|
};
|
|
let mut id_visitor = IdVisitor {
|
|
operation: &mut visitor,
|
|
pass_through_items: false,
|
|
visited_outermost: false,
|
|
};
|
|
id_visitor.visit_fn(fk, decl, body, sp, id);
|
|
id_visitor.operation.result
|
|
}
|
|
|
|
pub fn walk_pat<F>(pat: &Pat, mut it: F) -> bool where F: FnMut(&Pat) -> bool {
|
|
// FIXME(#19596) this is a workaround, but there should be a better way
|
|
fn walk_pat_<G>(pat: &Pat, it: &mut G) -> bool where G: FnMut(&Pat) -> bool {
|
|
if !(*it)(pat) {
|
|
return false;
|
|
}
|
|
|
|
match pat.node {
|
|
PatIdent(_, _, Some(ref p)) => walk_pat_(&**p, it),
|
|
PatStruct(_, ref fields, _) => {
|
|
fields.iter().all(|field| walk_pat_(&*field.node.pat, it))
|
|
}
|
|
PatEnum(_, Some(ref s)) | PatTup(ref s) => {
|
|
s.iter().all(|p| walk_pat_(&**p, it))
|
|
}
|
|
PatBox(ref s) | PatRegion(ref s, _) => {
|
|
walk_pat_(&**s, it)
|
|
}
|
|
PatVec(ref before, ref slice, ref after) => {
|
|
before.iter().all(|p| walk_pat_(&**p, it)) &&
|
|
slice.iter().all(|p| walk_pat_(&**p, it)) &&
|
|
after.iter().all(|p| walk_pat_(&**p, it))
|
|
}
|
|
PatMac(_) => panic!("attempted to analyze unexpanded pattern"),
|
|
PatWild(_) | PatLit(_) | PatRange(_, _) | PatIdent(_, _, _) |
|
|
PatEnum(_, _) => {
|
|
true
|
|
}
|
|
}
|
|
}
|
|
|
|
walk_pat_(pat, &mut it)
|
|
}
|
|
|
|
/// 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::StructDef) -> bool {
|
|
struct_def.ctor_id.is_some()
|
|
}
|
|
|
|
/// Returns true if the given pattern consists solely of an identifier
|
|
/// and false otherwise.
|
|
pub fn pat_is_ident(pat: P<ast::Pat>) -> bool {
|
|
match pat.node {
|
|
ast::PatIdent(..) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
// are two paths equal when compared unhygienically?
|
|
// since I'm using this to replace ==, it seems appropriate
|
|
// to compare the span, global, etc. fields as well.
|
|
pub fn path_name_eq(a : &ast::Path, b : &ast::Path) -> bool {
|
|
(a.span == b.span)
|
|
&& (a.global == b.global)
|
|
&& (segments_name_eq(&a.segments[], &b.segments[]))
|
|
}
|
|
|
|
// are two arrays of segments equal when compared unhygienically?
|
|
pub fn segments_name_eq(a : &[ast::PathSegment], b : &[ast::PathSegment]) -> bool {
|
|
a.len() == b.len() &&
|
|
a.iter().zip(b.iter()).all(|(s, t)| {
|
|
s.identifier.name == t.identifier.name &&
|
|
// FIXME #7743: ident -> name problems in lifetime comparison?
|
|
// can types contain idents?
|
|
s.parameters == t.parameters
|
|
})
|
|
}
|
|
|
|
/// Returns true if this literal is a string and false otherwise.
|
|
pub fn lit_is_str(lit: &Lit) -> bool {
|
|
match lit.node {
|
|
LitStr(..) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
/// Macro invocations are guaranteed not to occur after expansion is complete.
|
|
/// Extracting fields of a method requires a dynamic check to make sure that it's
|
|
/// not a macro invocation. This check is guaranteed to succeed, assuming
|
|
/// that the invocations are indeed gone.
|
|
pub trait PostExpansionMethod {
|
|
fn pe_ident(&self) -> ast::Ident;
|
|
fn pe_generics<'a>(&'a self) -> &'a ast::Generics;
|
|
fn pe_abi(&self) -> Abi;
|
|
fn pe_explicit_self<'a>(&'a self) -> &'a ast::ExplicitSelf;
|
|
fn pe_unsafety(&self) -> ast::Unsafety;
|
|
fn pe_fn_decl<'a>(&'a self) -> &'a ast::FnDecl;
|
|
fn pe_body<'a>(&'a self) -> &'a ast::Block;
|
|
fn pe_vis(&self) -> ast::Visibility;
|
|
}
|
|
|
|
macro_rules! mf_method{
|
|
($meth_name:ident, $field_ty:ty, $field_pat:pat, $result:expr) => {
|
|
fn $meth_name<'a>(&'a self) -> $field_ty {
|
|
match self.node {
|
|
$field_pat => $result,
|
|
MethMac(_) => {
|
|
panic!("expected an AST without macro invocations");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
impl PostExpansionMethod for Method {
|
|
mf_method! { pe_ident,ast::Ident,MethDecl(ident,_,_,_,_,_,_,_),ident }
|
|
mf_method! {
|
|
pe_generics,&'a ast::Generics,
|
|
MethDecl(_,ref generics,_,_,_,_,_,_),generics
|
|
}
|
|
mf_method! { pe_abi,Abi,MethDecl(_,_,abi,_,_,_,_,_),abi }
|
|
mf_method! {
|
|
pe_explicit_self,&'a ast::ExplicitSelf,
|
|
MethDecl(_,_,_,ref explicit_self,_,_,_,_),explicit_self
|
|
}
|
|
mf_method! { pe_unsafety,ast::Unsafety,MethDecl(_,_,_,_,unsafety,_,_,_),unsafety }
|
|
mf_method! { pe_fn_decl,&'a ast::FnDecl,MethDecl(_,_,_,_,_,ref decl,_,_),&**decl }
|
|
mf_method! { pe_body,&'a ast::Block,MethDecl(_,_,_,_,_,_,ref body,_),&**body }
|
|
mf_method! { pe_vis,ast::Visibility,MethDecl(_,_,_,_,_,_,_,vis),vis }
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use ast::*;
|
|
use super::*;
|
|
|
|
fn ident_to_segment(id : &Ident) -> PathSegment {
|
|
PathSegment {identifier: id.clone(),
|
|
parameters: PathParameters::none()}
|
|
}
|
|
|
|
#[test] fn idents_name_eq_test() {
|
|
assert!(segments_name_eq(
|
|
&[Ident{name:Name(3),ctxt:4}, Ident{name:Name(78),ctxt:82}]
|
|
.iter().map(ident_to_segment).collect::<Vec<PathSegment>>()[],
|
|
&[Ident{name:Name(3),ctxt:104}, Ident{name:Name(78),ctxt:182}]
|
|
.iter().map(ident_to_segment).collect::<Vec<PathSegment>>()[]));
|
|
assert!(!segments_name_eq(
|
|
&[Ident{name:Name(3),ctxt:4}, Ident{name:Name(78),ctxt:82}]
|
|
.iter().map(ident_to_segment).collect::<Vec<PathSegment>>()[],
|
|
&[Ident{name:Name(3),ctxt:104}, Ident{name:Name(77),ctxt:182}]
|
|
.iter().map(ident_to_segment).collect::<Vec<PathSegment>>()[]));
|
|
}
|
|
}
|