rust/src/librustc/middle/lang_items.rs
2013-05-01 15:40:05 +10:00

427 lines
14 KiB
Rust

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Detecting language items.
//
// Language items are items that represent concepts intrinsic to the language
// itself. Examples are:
//
// * Traits that specify "kinds"; e.g. "const", "copy", "owned".
//
// * Traits that represent operators; e.g. "add", "sub", "index".
//
// * Functions called by the compiler itself.
use driver::session::Session;
use metadata::csearch::each_lang_item;
use metadata::cstore::iter_crate_data;
use syntax::ast::{crate, def_id, lit_str, meta_item};
use syntax::ast::{meta_list, meta_name_value, meta_word};
use syntax::ast_util::local_def;
use syntax::visit::{default_simple_visitor, mk_simple_visitor, SimpleVisitor};
use syntax::visit::visit_crate;
use core::cast::transmute;
use core::hashmap::HashMap;
pub enum LangItem {
ConstTraitLangItem, // 0
CopyTraitLangItem, // 1
OwnedTraitLangItem, // 2
DurableTraitLangItem, // 3
DropTraitLangItem, // 4
AddTraitLangItem, // 5
SubTraitLangItem, // 6
MulTraitLangItem, // 7
DivTraitLangItem, // 8
RemTraitLangItem, // 9
NegTraitLangItem, // 10
NotTraitLangItem, // 11
BitXorTraitLangItem, // 12
BitAndTraitLangItem, // 13
BitOrTraitLangItem, // 14
ShlTraitLangItem, // 15
ShrTraitLangItem, // 16
IndexTraitLangItem, // 17
EqTraitLangItem, // 18
OrdTraitLangItem, // 19
StrEqFnLangItem, // 20
UniqStrEqFnLangItem, // 21
AnnihilateFnLangItem, // 22
LogTypeFnLangItem, // 23
FailFnLangItem, // 24
FailBoundsCheckFnLangItem, // 25
ExchangeMallocFnLangItem, // 26
ExchangeFreeFnLangItem, // 27
MallocFnLangItem, // 28
FreeFnLangItem, // 29
BorrowAsImmFnLangItem, // 30
ReturnToMutFnLangItem, // 31
CheckNotBorrowedFnLangItem, // 32
StrDupUniqFnLangItem, // 33
StartFnLangItem, // 34
}
pub struct LanguageItems {
items: [Option<def_id>, ..35]
}
pub impl LanguageItems {
pub fn new() -> LanguageItems {
LanguageItems {
items: [ None, ..35 ]
}
}
fn each_item(&self, f: &fn(def_id: def_id, i: uint) -> bool) {
for self.items.eachi |i, &item| {
if !f(item.get(), i) {
break;
}
}
}
pub fn item_name(index: uint) -> &'static str {
match index {
0 => "const",
1 => "copy",
2 => "owned",
3 => "durable",
4 => "drop",
5 => "add",
6 => "sub",
7 => "mul",
8 => "div",
9 => "rem",
10 => "neg",
11 => "not",
12 => "bitxor",
13 => "bitand",
14 => "bitor",
15 => "shl",
16 => "shr",
17 => "index",
18 => "eq",
19 => "ord",
20 => "str_eq",
21 => "uniq_str_eq",
22 => "annihilate",
23 => "log_type",
24 => "fail_",
25 => "fail_bounds_check",
26 => "exchange_malloc",
27 => "exchange_free",
28 => "malloc",
29 => "free",
30 => "borrow_as_imm",
31 => "return_to_mut",
32 => "check_not_borrowed",
33 => "strdup_uniq",
34 => "start",
_ => "???"
}
}
// FIXME #4621: Method macros sure would be nice here.
pub fn const_trait(&const self) -> def_id {
self.items[ConstTraitLangItem as uint].get()
}
pub fn copy_trait(&const self) -> def_id {
self.items[CopyTraitLangItem as uint].get()
}
pub fn owned_trait(&const self) -> def_id {
self.items[OwnedTraitLangItem as uint].get()
}
pub fn durable_trait(&const self) -> def_id {
self.items[DurableTraitLangItem as uint].get()
}
pub fn drop_trait(&const self) -> def_id {
self.items[DropTraitLangItem as uint].get()
}
pub fn add_trait(&const self) -> def_id {
self.items[AddTraitLangItem as uint].get()
}
pub fn sub_trait(&const self) -> def_id {
self.items[SubTraitLangItem as uint].get()
}
pub fn mul_trait(&const self) -> def_id {
self.items[MulTraitLangItem as uint].get()
}
pub fn div_trait(&const self) -> def_id {
self.items[DivTraitLangItem as uint].get()
}
pub fn rem_trait(&const self) -> def_id {
self.items[RemTraitLangItem as uint].get()
}
pub fn neg_trait(&const self) -> def_id {
self.items[NegTraitLangItem as uint].get()
}
pub fn not_trait(&const self) -> def_id {
self.items[NotTraitLangItem as uint].get()
}
pub fn bitxor_trait(&const self) -> def_id {
self.items[BitXorTraitLangItem as uint].get()
}
pub fn bitand_trait(&const self) -> def_id {
self.items[BitAndTraitLangItem as uint].get()
}
pub fn bitor_trait(&const self) -> def_id {
self.items[BitOrTraitLangItem as uint].get()
}
pub fn shl_trait(&const self) -> def_id {
self.items[ShlTraitLangItem as uint].get()
}
pub fn shr_trait(&const self) -> def_id {
self.items[ShrTraitLangItem as uint].get()
}
pub fn index_trait(&const self) -> def_id {
self.items[IndexTraitLangItem as uint].get()
}
pub fn eq_trait(&const self) -> def_id {
self.items[EqTraitLangItem as uint].get()
}
pub fn ord_trait(&const self) -> def_id {
self.items[OrdTraitLangItem as uint].get()
}
pub fn str_eq_fn(&const self) -> def_id {
self.items[StrEqFnLangItem as uint].get()
}
pub fn uniq_str_eq_fn(&const self) -> def_id {
self.items[UniqStrEqFnLangItem as uint].get()
}
pub fn annihilate_fn(&const self) -> def_id {
self.items[AnnihilateFnLangItem as uint].get()
}
pub fn log_type_fn(&const self) -> def_id {
self.items[LogTypeFnLangItem as uint].get()
}
pub fn fail_fn(&const self) -> def_id {
self.items[FailFnLangItem as uint].get()
}
pub fn fail_bounds_check_fn(&const self) -> def_id {
self.items[FailBoundsCheckFnLangItem as uint].get()
}
pub fn exchange_malloc_fn(&const self) -> def_id {
self.items[ExchangeMallocFnLangItem as uint].get()
}
pub fn exchange_free_fn(&const self) -> def_id {
self.items[ExchangeFreeFnLangItem as uint].get()
}
pub fn malloc_fn(&const self) -> def_id {
self.items[MallocFnLangItem as uint].get()
}
pub fn free_fn(&const self) -> def_id {
self.items[FreeFnLangItem as uint].get()
}
pub fn borrow_as_imm_fn(&const self) -> def_id {
self.items[BorrowAsImmFnLangItem as uint].get()
}
pub fn return_to_mut_fn(&const self) -> def_id {
self.items[ReturnToMutFnLangItem as uint].get()
}
pub fn check_not_borrowed_fn(&const self) -> def_id {
self.items[CheckNotBorrowedFnLangItem as uint].get()
}
pub fn strdup_uniq_fn(&const self) -> def_id {
self.items[StrDupUniqFnLangItem as uint].get()
}
pub fn start_fn(&const self) -> def_id {
self.items[StartFnLangItem as uint].get()
}
}
fn LanguageItemCollector<'r>(crate: @crate,
session: Session,
items: &'r mut LanguageItems)
-> LanguageItemCollector<'r> {
let mut item_refs = HashMap::new();
item_refs.insert(@~"const", ConstTraitLangItem as uint);
item_refs.insert(@~"copy", CopyTraitLangItem as uint);
item_refs.insert(@~"owned", OwnedTraitLangItem as uint);
item_refs.insert(@~"durable", DurableTraitLangItem as uint);
item_refs.insert(@~"drop", DropTraitLangItem as uint);
item_refs.insert(@~"add", AddTraitLangItem as uint);
item_refs.insert(@~"sub", SubTraitLangItem as uint);
item_refs.insert(@~"mul", MulTraitLangItem as uint);
item_refs.insert(@~"div", DivTraitLangItem as uint);
item_refs.insert(@~"rem", RemTraitLangItem as uint);
item_refs.insert(@~"neg", NegTraitLangItem as uint);
item_refs.insert(@~"not", NotTraitLangItem as uint);
item_refs.insert(@~"bitxor", BitXorTraitLangItem as uint);
item_refs.insert(@~"bitand", BitAndTraitLangItem as uint);
item_refs.insert(@~"bitor", BitOrTraitLangItem as uint);
item_refs.insert(@~"shl", ShlTraitLangItem as uint);
item_refs.insert(@~"shr", ShrTraitLangItem as uint);
item_refs.insert(@~"index", IndexTraitLangItem as uint);
item_refs.insert(@~"eq", EqTraitLangItem as uint);
item_refs.insert(@~"ord", OrdTraitLangItem as uint);
item_refs.insert(@~"str_eq", StrEqFnLangItem as uint);
item_refs.insert(@~"uniq_str_eq", UniqStrEqFnLangItem as uint);
item_refs.insert(@~"annihilate", AnnihilateFnLangItem as uint);
item_refs.insert(@~"log_type", LogTypeFnLangItem as uint);
item_refs.insert(@~"fail_", FailFnLangItem as uint);
item_refs.insert(@~"fail_bounds_check",
FailBoundsCheckFnLangItem as uint);
item_refs.insert(@~"exchange_malloc", ExchangeMallocFnLangItem as uint);
item_refs.insert(@~"exchange_free", ExchangeFreeFnLangItem as uint);
item_refs.insert(@~"malloc", MallocFnLangItem as uint);
item_refs.insert(@~"free", FreeFnLangItem as uint);
item_refs.insert(@~"borrow_as_imm", BorrowAsImmFnLangItem as uint);
item_refs.insert(@~"return_to_mut", ReturnToMutFnLangItem as uint);
item_refs.insert(@~"check_not_borrowed",
CheckNotBorrowedFnLangItem as uint);
item_refs.insert(@~"strdup_uniq", StrDupUniqFnLangItem as uint);
item_refs.insert(@~"start", StartFnLangItem as uint);
LanguageItemCollector {
crate: crate,
session: session,
items: items,
item_refs: item_refs
}
}
struct LanguageItemCollector<'self> {
items: &'self mut LanguageItems,
crate: @crate,
session: Session,
item_refs: HashMap<@~str, uint>,
}
pub impl<'self> LanguageItemCollector<'self> {
fn match_and_collect_meta_item(&self, item_def_id: def_id,
meta_item: @meta_item) {
match meta_item.node {
meta_name_value(key, literal) => {
match literal.node {
lit_str(value) => {
self.match_and_collect_item(item_def_id, key, value);
}
_ => {} // Skip.
}
}
meta_word(*) | meta_list(*) => {} // Skip.
}
}
fn collect_item(&self, item_index: uint, item_def_id: def_id) {
// Check for duplicates.
match self.items.items[item_index] {
Some(original_def_id) if original_def_id != item_def_id => {
self.session.err(fmt!("duplicate entry for `%s`",
LanguageItems::item_name(item_index)));
}
Some(_) | None => {
// OK.
}
}
// Matched.
self.items.items[item_index] = Some(item_def_id);
}
fn match_and_collect_item(&self,
item_def_id: def_id, key: @~str, value: @~str) {
if *key != ~"lang" {
return; // Didn't match.
}
match self.item_refs.find(&value) {
None => {
// Didn't match.
}
Some(&item_index) => {
self.collect_item(item_index, item_def_id)
}
}
}
fn collect_local_language_items(&self) {
unsafe {
let this: *LanguageItemCollector<'self> = transmute(self);
visit_crate(self.crate, (), mk_simple_visitor(@SimpleVisitor {
visit_item: |item| {
for item.attrs.each |attribute| {
unsafe {
(*this).match_and_collect_meta_item(
local_def(item.id),
attribute.node.value
);
}
}
},
.. *default_simple_visitor()
}));
}
}
fn collect_external_language_items(&self) {
let crate_store = self.session.cstore;
do iter_crate_data(crate_store) |crate_number, _crate_metadata| {
for each_lang_item(crate_store, crate_number)
|node_id, item_index| {
let def_id = def_id { crate: crate_number, node: node_id };
self.collect_item(item_index, def_id);
}
}
}
fn check_completeness(&self) {
for self.item_refs.each |&key, &item_ref| {
match self.items.items[item_ref] {
None => {
self.session.err(fmt!("no item found for `%s`", *key));
}
Some(_) => {
// OK.
}
}
}
}
fn collect(&self) {
self.collect_local_language_items();
self.collect_external_language_items();
self.check_completeness();
}
}
pub fn collect_language_items(crate: @crate,
session: Session)
-> LanguageItems {
let mut items = LanguageItems::new();
let collector = LanguageItemCollector(crate, session, &mut items);
collector.collect();
copy items
}