1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
import std::map::hashmap;
import syntax::ast;
import ast::{ty, pat};
import syntax::codemap::{span};
import syntax::visit;
import syntax::print;
fn indent<R>(op: fn() -> R) -> R {
// Use in conjunction with the log post-processor like `src/etc/indenter`
// to make debug output more readable.
debug!{">>"};
let r <- op();
debug!{"<< (Result = %?)", r};
return r;
}
struct _indenter {
let _i: ();
new(_i: ()) { self._i = (); }
drop { debug!{"<<"}; }
}
fn indenter() -> _indenter {
debug!{">>"};
_indenter(())
}
type flag = hashmap<~str, ()>;
fn field_expr(f: ast::field) -> @ast::expr { return f.node.expr; }
fn field_exprs(fields: ~[ast::field]) -> ~[@ast::expr] {
let mut es = ~[];
for fields.each |f| { vec::push(es, f.node.expr); }
return es;
}
// Takes a predicate p, returns true iff p is true for any subexpressions
// of b -- skipping any inner loops (loop, while, loop_body)
fn loop_query(b: ast::blk, p: fn@(ast::expr_) -> bool) -> bool {
let rs = @mut false;
let visit_expr =
|e: @ast::expr, &&flag: @mut bool, v: visit::vt<@mut bool>| {
*flag |= p(e.node);
match e.node {
// Skip inner loops, since a break in the inner loop isn't a
// break inside the outer loop
ast::expr_loop(*) | ast::expr_while(*)
| ast::expr_loop_body(*) => {}
_ => visit::visit_expr(e, flag, v)
}
};
let v = visit::mk_vt(@{visit_expr: visit_expr
with *visit::default_visitor()});
visit::visit_block(b, rs, v);
return *rs;
}
fn has_nonlocal_exits(b: ast::blk) -> bool {
do loop_query(b) |e| {
match e {
ast::expr_break(_) | ast::expr_again(_) => true,
_ => false
}
}
}
fn may_break(b: ast::blk) -> bool {
do loop_query(b) |e| {
match e {
ast::expr_break(_) => true,
_ => false
}
}
}
fn local_rhs_span(l: @ast::local, def: span) -> span {
match l.node.init {
some(i) => return i.expr.span,
_ => return def
}
}
fn is_main_name(path: syntax::ast_map::path) -> bool {
// FIXME (#34): path should be a constrained type, so we know
// the call to last doesn't fail.
vec::last(path) == syntax::ast_map::path_name(@~"main")
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
//
|
