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2997 Commits

Author SHA1 Message Date
Tim Chevalier
172df2e3a2 Add non_ty_var precondition for type_of_fn, plus minor cleanup 2011-09-16 10:58:02 -07:00
Marijn Haverbeke
ad470d741e Revert "Saner approach to lvalues and callable values in trans" 
This reverts commit 66153436c9070386786c8a38cde199b5d3e71289.
 2011-09-16 18:37:46 +02:00
Marijn Haverbeke
133d36f452 Require body of else-less if expressions to be a value-less block 
For consistency with other constructs that could not possibly return a
value (say, loops).
 2011-09-16 18:21:06 +02:00
Marijn Haverbeke
66153436c9 Saner approach to lvalues and callable values in trans 
LValues no longer carry information about generics and objs, instead
there's an extended form of lvalue, lval_maybe_callee, only used by
call and bind, which holds this info.

This makes it possible to take the value of a method and get a working
closure, and will (with some more work) allow us to call statically
known functions without loading from their pair.

Closes #435
Closes #758
 2011-09-16 18:21:05 +02:00
Marijn Haverbeke
639d88a693 Move expr_uniq case in trans to a saner place 
Note that unique pointers are still broken in more ways than I can count.
 2011-09-16 15:03:03 +02:00
Marijn Haverbeke
f8a35234ad Remove autoderef for calls 
We were only using it in a single place, and there for no discernable reason
(probably as part of the bare-fn-vals-are-not-copyable plan). It seems more
surprising than useful.
 2011-09-16 14:39:30 +02:00
Marijn Haverbeke
c04490d97b Remove unused method_ty field from lval_result 2011-09-16 14:18:49 +02:00
Marijn Haverbeke
fb42d839a0 Clean up (and optimize) root-mutability analysis in alias.rs 2011-09-16 13:46:03 +02:00
Marijn Haverbeke
d7587c1eda Change convention for specifying referenced argument 
It is now 1-based, rather than 0 based. (Seems more natural, and allows 0 to
be used to refer to self and maybe to closure.)

Also allows non-referenced args to be implicitly copied again.

Issue #918
 2011-09-16 12:42:18 +02:00
Tim Chevalier
059b31f7a3 Actually call unreachable() in impossible case in type_of_inner 2011-09-15 23:22:12 -07:00
Tim Chevalier
57ede5f281 Added non_ty_var precondition to trans::type_of_inner 
This allows us to legitimately call unreachable() in the ty_var case.
 2011-09-15 23:22:12 -07:00
Jesse Ruderman
ce1877dc8e Add parens, as needed, around else-if conditions. 2011-09-15 21:24:24 -07:00
Tim Chevalier
2c6eba00dd Added an extra check in trans_alt 
Gratuitous right now, but I'm going to change the type of trans::type_of
 2011-09-15 20:32:01 -07:00
Tim Chevalier
f41f75fe53 Added more predicates in trans 
Added the non_ty_var predicate (soon to be used)
Added a check in get_res_dtor (will be necessary for a future change
to type_of_fn)
Removed a gratuitous ret
 2011-09-15 20:23:06 -07:00
Tim Chevalier
059952da5b Change a few span_fatals to span_err 2011-09-15 19:51:27 -07:00
Graydon Hoare
1e3e7d4bc5 Update README slightly. 2011-09-15 16:31:33 -07:00
Marijn Haverbeke
7364a8c2b0 Prevent binary expressions from parsing when lhs is non-value block 2011-09-15 17:37:10 +02:00
Marijn Haverbeke
b843cf2117 Generalize expression roots in alias analysis 
This allows calls-returning-a-reference to count as expression roots,
making it possible to return the result of such a call by reference.

Issue #918
 2011-09-15 17:01:35 +02:00
Marijn Haverbeke
3abe3671bd Require the parameter that will be referenced to be noted 
Issue #918
 2011-09-15 16:15:17 +02:00
Marijn Haverbeke
75eee8b194 Overhaul alias-checking of blocks 
The set of active bindings has to be updated as by-reference locals are
encountered.

Issue #918
 2011-09-15 15:43:15 +02:00
Marijn Haverbeke
87fa38910e Make storing returned references in a by-reference local work 
fn f(a: {x: str}) -> &str {
        ret a.x;
    }

    fn main() {
        let x = {x: "hi"};
        let &y = f(x); // Look ma, no copy!
        log_err y;
    }

Issue #918.
 2011-09-15 15:17:14 +02:00
Marijn Haverbeke
25787bd2b8 Forbid assignment to by-reference bindings 
Issue #918
 2011-09-15 14:08:54 +02:00
Marijn Haverbeke
d7a1d6a1cb Make trans understand by-ref bindings 
Issue #918
 2011-09-15 14:00:58 +02:00
Marijn Haverbeke
8aad16112b Implement basic checking of by-reference bindings 
Issue #918
 2011-09-15 13:40:28 +02:00
Marijn Haverbeke
44c6370e6a Move local numbering into ast_map.rs 
This further simplifies the alias pass, which is sorely needed.
 2011-09-15 13:18:32 +02:00
Marijn Haverbeke
1cda74deee Add representation for by-ref let bindings 
Issue #918
 2011-09-15 11:42:56 +02:00
Marijn Haverbeke
197f360e30 Ensure parens are wrapped around composite exprs in call/index/field pos 
This is needed to fix the second example in issue #919
 2011-09-15 11:15:14 +02:00
Marijn Haverbeke
8c83ea564b More thorough check for (.. 10).x in pretty-printer 
Closes #919
 2011-09-15 10:59:06 +02:00
Marijn Haverbeke
63ecc84562 Also handle fail and put in print_maybe_parens_discrim 
Closes #920
 2011-09-15 10:14:52 +02:00
Marijn Haverbeke
3798b6f780 Remove maybe_protect_block kludge from pretty-printer 
It is no longer needed.
 2011-09-15 10:14:52 +02:00
Marijn Haverbeke
0b34e0e60b Introduce new semicolon rules 
- Loop bodies and resource constructors aren't allowed to have
  trailing expressions anymore.

- An expression that ends* in a block without trailing expression can
  can not be called, indexed, or subscripted.

- Only expression-statements that end* in a block without trailing
  expression can omit their semicolon.

*) 'Ending in a trailing expression' is defined as being a block or
   construct-ending-in-a-block (if, alt) that either ends in an
   expression itself, or ends in another block-like expression that
   has a trailing expression (by these same rules).
 2011-09-15 09:49:00 +02:00
Marijn Haverbeke
7298b8f4ba Insert omitted semicolons for statements 2011-09-15 09:49:00 +02:00
Brian Anderson
31d4fe37f6 Revert "Try a little harder to avoid creating new landing pads" 
This reverts commit b8e31ac46917edcf5922f0b191c5e6c4505830d2.

Conflicts:

	src/comp/middle/trans.rs
 2011-09-14 09:19:31 -07:00
Marijn Haverbeke
93de2f0b74 Add syntax and representation for return-by-mutably-rooted-ref 
This will be used in the near future to decide what can safely
be done with the returned reference.

Issue #918
 2011-09-14 17:30:38 +02:00
Marijn Haverbeke
1cabe37155 Prevent memory errors when returning references to temp args. 
Issue #918
 2011-09-14 16:46:54 +02:00
Marijn Haverbeke
c6619f9ce0 Accept returning refs rooted in an arg from a by-ref funtion 
Issue #918
 2011-09-14 16:19:15 +02:00
Marijn Haverbeke
a3c449df74 Make ast_map.rs index function args, switch it over to simple_visitor 2011-09-14 15:30:59 +02:00
Marijn Haverbeke
cd0e7fc041 Remove some extra white-space introduced by the pretty-printer 2011-09-14 15:20:22 +02:00
Marijn Haverbeke
7d69712dee Disallow implicit arg copying when the function returns a ref 
Issue #918
 2011-09-14 14:57:20 +02:00
Marijn Haverbeke
93d2a4f82a Add support for basic return-by-alias to trans 
Issue #918
 2011-09-14 14:39:08 +02:00
Marijn Haverbeke
9a69ee79e0 Clean up trans_obj.rs a bit 
As a preparation to adding an arg to type_of_fn_full
 2011-09-14 13:49:22 +02:00
Marijn Haverbeke
6cd24173d4 Add a ret_style field to fn_ctxt in trans 2011-09-14 13:48:51 +02:00
Marijn Haverbeke
2aac43d809 Simplify trans::new_fn_ctxt_w_id 
It was still living in the pre-decent-type-inference era.
 2011-09-14 13:26:39 +02:00
Marijn Haverbeke
0699acb6f7 Rudimentary checking of safe alias returns 2011-09-14 13:09:45 +02:00
Marijn Haverbeke
63519d9006 Rename restrict to binding in alias.rs 
Its role gradually changed to the point where the old name doesn't
really make sense anymore.
 2011-09-14 12:06:51 +02:00
Marijn Haverbeke
44df041799 Stop needlessly boxing vectors in alias.rs 2011-09-14 11:37:52 +02:00
Marijn Haverbeke
51dae63c44 Make most of the compiler aware of return-by-reference 
tyencode/tydecode still don't know about it. return_ref will be extended to take
arguments anyway.
 2011-09-14 11:31:05 +02:00
Marijn Haverbeke
c1c083cd66 Refactor parse_ret_ty, start parsing by-alias return specs 2011-09-14 10:46:40 +02:00
Marijn Haverbeke
6eb9738a66 Rename ast::controlflow to ast::ret_style 
It will include information about returning by alias.
 2011-09-14 10:38:23 +02:00
Josh Matthews
f6fe07d1f3 Add support for negative literals. 2011-09-14 00:47:14 -04:00