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Re-enable List.get

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This commit is contained in:
Richard Feldman 2020-04-28 19:33:10 -04:00
parent 357cd3bd70
commit 353377c29e
1 changed files with 145 additions and 158 deletions
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303
compiler/can/src/builtins.rs
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@ -26,174 +26,134 @@ use roc_types::subs::{VarStore, Variable};
/// lookup (if the bounds check passed). That internal function is hardcoded in code gen,
/// which works fine because it doesn't involve any open tag unions.
pub fn builtin_defs(var_store: &VarStore) -> Vec<Def> {
vec![/*list_get(var_store),*/ list_first(var_store)]
vec![list_get(var_store), list_first(var_store)]
}
/// List.get : List elem, Int -> Result elem [ OutOfBounds ]*
// fn list_get(var_store: &VarStore) -> Def {
// use crate::expr::Expr::*;
// use crate::pattern::Pattern::*;
fn list_get(var_store: &VarStore) -> Def {
use crate::expr::Expr::*;
// let args = vec![
// (
// var_store.fresh(),
// no_region(Identifier(Symbol::LIST_GET_ARG_LIST)),
// ),
// (
// var_store.fresh(),
// no_region(Identifier(Symbol::LIST_GET_ARG_INDEX)),
// ),
// ];
// // Perform a bounds check. If it passes, delegate to List.#getUnsafe
// let body = If {
// cond_var: var_store.fresh(),
// branch_var: var_store.fresh(),
// branches: vec![(
// // if-condition
// no_region(
// // index < List.len list
// call(
// Symbol::NUM_LT,
// vec![
// Var(Symbol::LIST_GET_ARG_INDEX),
// call(
// Symbol::LIST_LEN,
// vec![Var(Symbol::LIST_GET_ARG_LIST)],
// var_store,
// ),
// ],
// var_store,
// ),
// ),
// // then-branch
// no_region(
// // Ok
// tag(
// "Ok",
// vec![
// // List.getUnsafe list index
// Call(
// Box::new((
// var_store.fresh(),
// no_region(Var(Symbol::LIST_GET_UNSAFE)),
// var_store.fresh(),
// )),
// vec![
// (var_store.fresh(), no_region(Var(Symbol::LIST_GET_ARG_LIST))),
// (
// var_store.fresh(),
// no_region(Var(Symbol::LIST_GET_ARG_INDEX)),
// ),
// ],
// CalledVia::Space,
// ),
// ],
// var_store,
// ),
// ),
// )],
// final_else: Box::new(
// // else-branch
// no_region(
// // Err
// tag(
// "Err",
// vec![tag("OutOfBounds", Vec::new(), var_store)],
// var_store,
// ),
// ),
// ),
// };
// let expr = Closure(
// var_store.fresh(),
// Symbol::LIST_GET,
// Recursive::NotRecursive,
// args,
// Box::new((no_region(body), var_store.fresh())),
// );
// Def {
// loc_pattern: no_region(Identifier(Symbol::LIST_GET)),
// loc_expr: no_region(expr),
// expr_var: var_store.fresh(),
// pattern_vars: SendMap::default(),
// annotation: None,
// }
// }
defn(
Symbol::LIST_GET,
vec![Symbol::LIST_GET_ARG_LIST, Symbol::LIST_GET_ARG_INDEX],
var_store,
// Perform a bounds check. If it passes, delegate to List.#getUnsafe
If {
cond_var: var_store.fresh(),
branch_var: var_store.fresh(),
branches: vec![(
// if-condition
no_region(
// index < List.len list
call(
Symbol::NUM_LT,
vec![
Var(Symbol::LIST_GET_ARG_INDEX),
call(
Symbol::LIST_LEN,
vec![Var(Symbol::LIST_GET_ARG_LIST)],
var_store,
),
],
var_store,
),
),
// then-branch
no_region(
// Ok
tag(
"Ok",
vec![
// List.getUnsafe list index
Call(
Box::new((
var_store.fresh(),
no_region(Var(Symbol::LIST_GET_UNSAFE)),
var_store.fresh(),
)),
vec![
(var_store.fresh(), no_region(Var(Symbol::LIST_GET_ARG_LIST))),
(
var_store.fresh(),
no_region(Var(Symbol::LIST_GET_ARG_INDEX)),
),
],
CalledVia::Space,
),
],
var_store,
),
),
)],
final_else: Box::new(
// else-branch
no_region(
// Err
tag(
"Err",
vec![tag("OutOfBounds", Vec::new(), var_store)],
var_store,
),
),
),
},
)
}
/// List.first : List elem -> Result elem [ ListWasEmpty ]*
fn list_first(var_store: &VarStore) -> Def {
use crate::expr::Expr::*;
use crate::pattern::Pattern::*;
let args = vec![(
var_store.fresh(),
no_region(Identifier(Symbol::LIST_FIRST_ARG)),
)];
// Perform a bounds check. If it passes, delegate to List.getUnsafe.
let body = If {
// TODO Use "when" instead of "if" so that we can have False be the first branch.
// We want that for branch prediction; usually we expect the list to be nonempty.
cond_var: var_store.fresh(),
branch_var: var_store.fresh(),
branches: vec![(
// if-condition
no_region(
// List.isEmpty list
call(
Symbol::LIST_IS_EMPTY,
vec![Var(Symbol::LIST_FIRST_ARG)],
var_store,
),
),
// list was empty
no_region(
// Err ListWasEmpty
tag(
"Err",
vec![tag("ListWasEmpty", Vec::new(), var_store)],
var_store,
),
),
)],
final_else: Box::new(
// list was not empty
no_region(
// Ok (List.#getUnsafe list 0)
tag(
"Ok",
vec![
// List.#getUnsafe list 0
call(
Symbol::LIST_GET_UNSAFE,
vec![(Var(Symbol::LIST_FIRST_ARG)), (Int(var_store.fresh(), 0))],
var_store,
),
],
var_store,
),
),
),
};
let expr = Closure(
var_store.fresh(),
defn(
Symbol::LIST_FIRST,
Recursive::NotRecursive,
args,
Box::new((no_region(body), var_store.fresh())),
);
Def {
loc_pattern: no_region(Identifier(Symbol::LIST_FIRST)),
loc_expr: no_region(expr),
expr_var: var_store.fresh(),
pattern_vars: SendMap::default(),
annotation: None,
}
vec![Symbol::LIST_FIRST_ARG],
var_store,
// Perform a bounds check. If it passes, delegate to List.getUnsafe.
If {
// TODO Use "when" instead of "if" so that we can have False be the first branch.
// We want that for branch prediction; usually we expect the list to be nonempty.
cond_var: var_store.fresh(),
branch_var: var_store.fresh(),
branches: vec![(
// if-condition
no_region(
// List.isEmpty list
call(
Symbol::LIST_IS_EMPTY,
vec![Var(Symbol::LIST_FIRST_ARG)],
var_store,
),
),
// list was empty
no_region(
// Err ListWasEmpty
tag(
"Err",
vec![tag("ListWasEmpty", Vec::new(), var_store)],
var_store,
),
),
)],
final_else: Box::new(
// list was not empty
no_region(
// Ok (List.#getUnsafe list 0)
tag(
"Ok",
vec![
// List.#getUnsafe list 0
call(
Symbol::LIST_GET_UNSAFE,
vec![(Var(Symbol::LIST_FIRST_ARG)), (Int(var_store.fresh(), 0))],
var_store,
),
],
var_store,
),
),
),
},
)
}
#[inline(always)]
@ -231,3 +191,30 @@ fn call(symbol: Symbol, args: Vec<Expr>, var_store: &VarStore) -> Expr {
CalledVia::Space,
)
}
#[inline(always)]
fn defn(fn_name: Symbol, args: Vec<Symbol>, var_store: &VarStore, body: Expr) -> Def {
use crate::expr::Expr::*;
use crate::pattern::Pattern::*;
let closure_args = args
.into_iter()
.map(|symbol| (var_store.fresh(), no_region(Identifier(symbol))))
.collect();
let expr = Closure(
var_store.fresh(),
fn_name,
Recursive::NotRecursive,
closure_args,
Box::new((no_region(body), var_store.fresh())),
);
Def {
loc_pattern: no_region(Identifier(fn_name)),
loc_expr: no_region(expr),
expr_var: var_store.fresh(),
pattern_vars: SendMap::default(),
annotation: None,
}
}