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b2a09562
编写于
2月 24, 2011
作者:
G
Graydon Hoare
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Factor crate expr evaluator out of parser, expand to simple scalars and ops, if, alt.
上级
dcd65fac
变更
4
隐藏空白更改
内联
并排
Showing
4 changed file
with
453 addition
and
82 deletion
+453
-82
src/comp/front/ast.rs
src/comp/front/ast.rs
+6
-2
src/comp/front/eval.rs
src/comp/front/eval.rs
+443
-0
src/comp/front/parser.rs
src/comp/front/parser.rs
+3
-79
src/comp/rustc.rc
src/comp/rustc.rc
+1
-1
未找到文件。
src/comp/front/ast.rs
浏览文件 @
b2a09562
...
...
@@ -46,7 +46,10 @@
tag
crate_directive_
{
cdir_expr
(
@
expr
);
cdir_const
(
@
item
);
// FIXME: cdir_let should be eliminated
// and redirected to the use of const stmt_decls inside
// crate directive blocks.
cdir_let
(
ident
,
@
expr
,
vec
[
@
crate_directive
]);
cdir_src_mod
(
ident
,
option
.t
[
filename
]);
cdir_dir_mod
(
ident
,
option
.t
[
filename
],
vec
[
@
crate_directive
]);
cdir_view_item
(
@
view_item
);
...
...
@@ -137,6 +140,8 @@
tag
stmt_
{
stmt_decl
(
@
decl
);
stmt_expr
(
@
expr
);
// These only exist in crate-level blocks.
stmt_crate_directive
(
@
crate_directive
);
}
type
local
=
rec
(
option
.t
[
@
ty
]
ty
,
...
...
@@ -175,7 +180,6 @@
expr_do_while
(
block
,
@
expr
,
ann
);
expr_alt
(
@
expr
,
vec
[
arm
],
ann
);
expr_block
(
block
,
ann
);
expr_crate_directive_block
(
vec
[
crate_directive_
]);
expr_assign
(
@
expr
/* TODO: @expr|is_lval */
,
@
expr
,
ann
);
expr_assign_op
(
binop
,
@
expr
/* TODO: @expr|is_lval */
,
@
expr
,
ann
);
expr_field
(
@
expr
,
ident
,
ann
);
...
...
src/comp/front/eval.rs
0 → 100644
浏览文件 @
b2a09562
import
std
._vec
;
import
std
._str
;
import
std
.option
;
import
std
.option.some
;
import
std
.option.none
;
import
std
.map.hashmap
;
import
driver
.session
;
import
ast
.ident
;
import
front
.parser.parser
;
import
front
.parser.spanned
;
import
front
.parser.new_parser
;
import
front
.parser.parse_mod_items
;
import
util
.common
;
import
util
.common.filename
;
import
util
.common.append
;
import
util
.common.span
;
import
util
.common.new_str_hash
;
// Simple dynamic-typed value type for eval_expr.
tag
val
{
val_bool
(
bool
);
val_int
(
int
);
val_str
(
str
);
}
type
env
=
vec
[
tup
(
ident
,
val
)];
fn
mk_env
()
->
env
{
let
env
e
=
vec
();
ret
e
;
}
fn
val_is_bool
(
val
v
)
->
bool
{
alt
(
v
)
{
case
(
val_bool
(
_
))
{
ret
true
;
}
case
(
_
)
{
}
}
ret
false
;
}
fn
val_is_int
(
val
v
)
->
bool
{
alt
(
v
)
{
case
(
val_bool
(
_
))
{
ret
true
;
}
case
(
_
)
{
}
}
ret
false
;
}
fn
val_is_str
(
val
v
)
->
bool
{
alt
(
v
)
{
case
(
val_str
(
_
))
{
ret
true
;
}
case
(
_
)
{
}
}
ret
false
;
}
fn
val_as_bool
(
val
v
)
->
bool
{
alt
(
v
)
{
case
(
val_bool
(
?
b
))
{
ret
b
;
}
case
(
_
)
{
}
}
fail
;
}
fn
val_as_int
(
val
v
)
->
int
{
alt
(
v
)
{
case
(
val_int
(
?
i
))
{
ret
i
;
}
case
(
_
)
{
}
}
fail
;
}
fn
val_as_str
(
val
v
)
->
str
{
alt
(
v
)
{
case
(
val_str
(
?
s
))
{
ret
s
;
}
case
(
_
)
{
}
}
fail
;
}
fn
lookup
(
session
.session
sess
,
env
e
,
span
sp
,
ident
i
)
->
val
{
for
(
tup
(
ident
,
val
)
pair
in
e
)
{
if
(
_
str
.eq
(
i
,
pair
._0
))
{
ret
pair
._1
;
}
}
sess
.span_err
(
sp
,
"unknown variable: "
+
i
);
fail
;
}
fn
eval_lit
(
session
.session
sess
,
env
e
,
span
sp
,
@
ast
.lit
lit
)
->
val
{
alt
(
lit
.node
)
{
case
(
ast
.lit_bool
(
?
b
))
{
ret
val_bool
(
b
);
}
case
(
ast
.lit_int
(
?
i
))
{
ret
val_int
(
i
);
}
case
(
ast
.lit_str
(
?
s
))
{
ret
val_str
(
s
);
}
case
(
_
)
{
sess
.span_err
(
sp
,
"evaluating unsupported literal"
);
}
}
fail
;
}
fn
eval_expr
(
session
.session
sess
,
env
e
,
@
ast
.expr
x
)
->
val
{
alt
(
x
.node
)
{
case
(
ast
.expr_path
(
?
pth
,
_
,
_
))
{
if
(
_
vec
.len
[
ident
](
pth
.node.idents
)
==
1u
&&
_
vec
.len
[
@
ast
.ty
](
pth
.node.types
)
==
0u
)
{
ret
lookup
(
sess
,
e
,
x
.span
,
pth
.node.idents
.
(
0
));
}
sess
.span_err
(
x
.span
,
"evaluating structured path-name"
);
}
case
(
ast
.expr_lit
(
?
lit
,
_
))
{
ret
eval_lit
(
sess
,
e
,
x
.span
,
lit
);
}
case
(
ast
.expr_unary
(
?
op
,
?
a
,
_
))
{
auto
av
=
eval_expr
(
sess
,
e
,
a
);
alt
(
op
)
{
case
(
ast
.not
)
{
if
(
val_is_bool
(
av
))
{
ret
val_bool
(
!
val_as_bool
(
av
));
}
sess
.span_err
(
x
.span
,
"bad types in '!' expression"
);
}
case
(
_
)
{
sess
.span_err
(
x
.span
,
"evaluating unsupported unop"
);
}
}
}
case
(
ast
.expr_binary
(
?
op
,
?
a
,
?
b
,
_
))
{
auto
av
=
eval_expr
(
sess
,
e
,
a
);
auto
bv
=
eval_expr
(
sess
,
e
,
b
);
alt
(
op
)
{
case
(
ast
.add
)
{
if
(
val_is_int
(
av
)
&&
val_is_int
(
bv
))
{
ret
val_int
(
val_as_int
(
av
)
+
val_as_int
(
bv
));
}
if
(
val_is_str
(
av
)
&&
val_is_str
(
bv
))
{
ret
val_str
(
val_as_str
(
av
)
+
val_as_str
(
bv
));
}
sess
.span_err
(
x
.span
,
"bad types in '+' expression"
);
}
case
(
ast
.sub
)
{
if
(
val_is_int
(
av
)
&&
val_is_int
(
bv
))
{
ret
val_int
(
val_as_int
(
av
)
-
val_as_int
(
bv
));
}
sess
.span_err
(
x
.span
,
"bad types in '-' expression"
);
}
case
(
ast
.mul
)
{
if
(
val_is_int
(
av
)
&&
val_is_int
(
bv
))
{
ret
val_int
(
val_as_int
(
av
)
*
val_as_int
(
bv
));
}
sess
.span_err
(
x
.span
,
"bad types in '*' expression"
);
}
case
(
ast
.div
)
{
if
(
val_is_int
(
av
)
&&
val_is_int
(
bv
))
{
ret
val_int
(
val_as_int
(
av
)
/
val_as_int
(
bv
));
}
sess
.span_err
(
x
.span
,
"bad types in '/' expression"
);
}
case
(
ast
.rem
)
{
if
(
val_is_int
(
av
)
&&
val_is_int
(
bv
))
{
ret
val_int
(
val_as_int
(
av
)
%
val_as_int
(
bv
));
}
sess
.span_err
(
x
.span
,
"bad types in '%' expression"
);
}
case
(
ast
.and
)
{
if
(
val_is_bool
(
av
)
&&
val_is_bool
(
bv
))
{
ret
val_bool
(
val_as_bool
(
av
)
&&
val_as_bool
(
bv
));
}
sess
.span_err
(
x
.span
,
"bad types in '&&' expression"
);
}
case
(
ast
.or
)
{
if
(
val_is_bool
(
av
)
&&
val_is_bool
(
bv
))
{
ret
val_bool
(
val_as_bool
(
av
)
||
val_as_bool
(
bv
));
}
sess
.span_err
(
x
.span
,
"bad types in '||' expression"
);
}
case
(
ast
.eq
)
{
ret
val_bool
(
val_eq
(
sess
,
x
.span
,
av
,
bv
));
}
case
(
ast
.ne
)
{
ret
val_bool
(
!
val_eq
(
sess
,
x
.span
,
av
,
bv
));
}
case
(
_
)
{
sess
.span_err
(
x
.span
,
"evaluating unsupported binop"
);
}
}
}
case
(
_
)
{
sess
.span_err
(
x
.span
,
"evaluating unsupported expression"
);
}
}
fail
;
}
fn
val_eq
(
session
.session
sess
,
span
sp
,
val
av
,
val
bv
)
->
bool
{
if
(
val_is_bool
(
av
)
&&
val_is_bool
(
bv
))
{
ret
val_as_bool
(
av
)
==
val_as_bool
(
bv
);
}
if
(
val_is_int
(
av
)
&&
val_is_int
(
bv
))
{
ret
val_as_int
(
av
)
==
val_as_int
(
bv
);
}
if
(
val_is_str
(
av
)
&&
val_is_str
(
bv
))
{
ret
_
str
.eq
(
val_as_str
(
av
),
val_as_str
(
bv
));
}
sess
.span_err
(
sp
,
"bad types in comparison"
);
fail
;
}
impure
fn
eval_crate_directives
(
parser
p
,
env
e
,
vec
[
@
ast
.crate_directive
]
cdirs
,
str
prefix
,
&
mutable
vec
[
@
ast
.view_item
]
view_items
,
&
mutable
vec
[
@
ast
.item
]
items
,
hashmap
[
ast
.ident
,
ast
.mod_index_entry
]
index
)
{
for
(
@
ast
.crate_directive
sub_cdir
in
cdirs
)
{
eval_crate_directive
(
p
,
e
,
sub_cdir
,
prefix
,
view_items
,
items
,
index
);
}
}
impure
fn
eval_crate_directives_to_mod
(
parser
p
,
env
e
,
vec
[
@
ast
.crate_directive
]
cdirs
,
str
prefix
)
->
ast
._mod
{
let
vec
[
@
ast
.view_item
]
view_items
=
vec
();
let
vec
[
@
ast
.item
]
items
=
vec
();
auto
index
=
new_str_hash
[
ast
.mod_index_entry
]();
eval_crate_directives
(
p
,
e
,
cdirs
,
prefix
,
view_items
,
items
,
index
);
ret
rec
(
view_items
=
view_items
,
items
=
items
,
index
=
index
);
}
impure
fn
eval_crate_directive_block
(
parser
p
,
env
e
,
&
ast
.block
blk
,
str
prefix
,
&
mutable
vec
[
@
ast
.view_item
]
view_items
,
&
mutable
vec
[
@
ast
.item
]
items
,
hashmap
[
ast
.ident
,
ast
.mod_index_entry
]
index
)
{
for
(
@
ast
.stmt
s
in
blk
.node.stmts
)
{
alt
(
s
.node
)
{
case
(
ast
.stmt_crate_directive
(
?
cdir
))
{
eval_crate_directive
(
p
,
e
,
cdir
,
prefix
,
view_items
,
items
,
index
);
}
case
(
_
)
{
auto
sess
=
p
.get_session
();
sess
.span_err
(
s
.span
,
"unsupported stmt in crate-directive block"
);
}
}
}
}
impure
fn
eval_crate_directive_expr
(
parser
p
,
env
e
,
@
ast
.expr
x
,
str
prefix
,
&
mutable
vec
[
@
ast
.view_item
]
view_items
,
&
mutable
vec
[
@
ast
.item
]
items
,
hashmap
[
ast
.ident
,
ast
.mod_index_entry
]
index
)
{
auto
sess
=
p
.get_session
();
alt
(
x
.node
)
{
case
(
ast
.expr_if
(
?
cond
,
?
thn
,
?
elifs
,
?
elopt
,
_
))
{
auto
cv
=
eval_expr
(
sess
,
e
,
cond
);
if
(
!
val_is_bool
(
cv
))
{
sess
.span_err
(
x
.span
,
"bad cond type in 'if'"
);
}
if
(
val_as_bool
(
cv
))
{
ret
eval_crate_directive_block
(
p
,
e
,
thn
,
prefix
,
view_items
,
items
,
index
);
}
for
(
tup
(
@
ast
.expr
,
ast
.block
)
elif
in
elifs
)
{
auto
cv
=
eval_expr
(
sess
,
e
,
elif
._0
);
if
(
!
val_is_bool
(
cv
))
{
sess
.span_err
(
x
.span
,
"bad cond type in 'else if'"
);
}
if
(
val_as_bool
(
cv
))
{
ret
eval_crate_directive_block
(
p
,
e
,
elif
._1
,
prefix
,
view_items
,
items
,
index
);
}
}
alt
(
elopt
)
{
case
(
some
[
ast
.block
](
?
els
))
{
ret
eval_crate_directive_block
(
p
,
e
,
els
,
prefix
,
view_items
,
items
,
index
);
}
case
(
_
)
{
// Absent-else is ok.
}
}
}
case
(
ast
.expr_alt
(
?
v
,
?
arms
,
_
))
{
auto
vv
=
eval_expr
(
sess
,
e
,
v
);
for
(
ast
.arm
arm
in
arms
)
{
alt
(
arm
.pat.node
)
{
case
(
ast
.pat_lit
(
?
lit
,
_
))
{
auto
pv
=
eval_lit
(
sess
,
e
,
arm
.pat.span
,
lit
);
if
(
val_eq
(
sess
,
arm
.pat.span
,
vv
,
pv
))
{
ret
eval_crate_directive_block
(
p
,
e
,
arm
.block
,
prefix
,
view_items
,
items
,
index
);
}
}
case
(
ast
.pat_wild
(
_
))
{
ret
eval_crate_directive_block
(
p
,
e
,
arm
.block
,
prefix
,
view_items
,
items
,
index
);
}
case
(
_
)
{
sess
.span_err
(
arm
.pat.span
,
"bad pattern type in 'alt'"
);
}
}
}
sess
.span_err
(
x
.span
,
"no cases matched in 'alt'"
);
}
case
(
_
)
{
sess
.span_err
(
x
.span
,
"unsupported expr type"
);
}
}
}
impure
fn
eval_crate_directive
(
parser
p
,
env
e
,
@
ast
.crate_directive
cdir
,
str
prefix
,
&
mutable
vec
[
@
ast
.view_item
]
view_items
,
&
mutable
vec
[
@
ast
.item
]
items
,
hashmap
[
ast
.ident
,
ast
.mod_index_entry
]
index
)
{
alt
(
cdir
.node
)
{
case
(
ast
.cdir_let
(
?
id
,
?
x
,
?
cdirs
))
{
auto
v
=
eval_expr
(
p
.get_session
(),
e
,
x
);
auto
e0
=
vec
(
tup
(
id
,
v
))
+
e
;
eval_crate_directives
(
p
,
e0
,
cdirs
,
prefix
,
view_items
,
items
,
index
);
}
case
(
ast
.cdir_expr
(
?
x
))
{
eval_crate_directive_expr
(
p
,
e
,
x
,
prefix
,
view_items
,
items
,
index
);
}
case
(
ast
.cdir_src_mod
(
?
id
,
?
file_opt
))
{
auto
file_path
=
id
+
".rs"
;
alt
(
file_opt
)
{
case
(
some
[
filename
](
?
f
))
{
file_path
=
f
;
}
case
(
none
[
filename
])
{}
}
auto
full_path
=
prefix
+
std
.os
.path_sep
()
+
file_path
;
auto
p0
=
new_parser
(
p
.get_session
(),
0
,
full_path
);
auto
m0
=
parse_mod_items
(
p0
,
token
.EOF
);
auto
im
=
ast
.item_mod
(
id
,
m0
,
p
.next_def_id
());
auto
i
=
@
spanned
(
cdir
.span
,
cdir
.span
,
im
);
ast
.index_item
(
index
,
i
);
append
[
@
ast
.item
](
items
,
i
);
}
case
(
ast
.cdir_dir_mod
(
?
id
,
?
dir_opt
,
?
cdirs
))
{
auto
path
=
id
;
alt
(
dir_opt
)
{
case
(
some
[
filename
](
?
d
))
{
path
=
d
;
}
case
(
none
[
filename
])
{}
}
auto
full_path
=
prefix
+
std
.os
.path_sep
()
+
path
;
auto
m0
=
eval_crate_directives_to_mod
(
p
,
e
,
cdirs
,
path
);
auto
im
=
ast
.item_mod
(
id
,
m0
,
p
.next_def_id
());
auto
i
=
@
spanned
(
cdir
.span
,
cdir
.span
,
im
);
ast
.index_item
(
index
,
i
);
append
[
@
ast
.item
](
items
,
i
);
}
case
(
ast
.cdir_view_item
(
?
vi
))
{
append
[
@
ast
.view_item
](
view_items
,
vi
);
ast
.index_view_item
(
index
,
vi
);
}
case
(
ast
.cdir_meta
(
?
mi
))
{}
case
(
ast
.cdir_syntax
(
?
pth
))
{}
case
(
ast
.cdir_auth
(
?
pth
,
?
eff
))
{}
}
}
//
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
//
src/comp/front/parser.rs
浏览文件 @
b2a09562
...
...
@@ -2111,80 +2111,6 @@ fn is_use_or_import(token.token t) -> bool {
//
// Each directive imperatively extends its environment with 0 or more items.
impure
fn
eval_crate_directives
(
parser
p
,
vec
[
@
ast
.crate_directive
]
cdirs
,
str
prefix
)
->
ast
._mod
{
let
vec
[
@
ast
.item
]
items
=
vec
();
auto
index
=
new_str_hash
[
ast
.mod_index_entry
]();
auto
view_items
=
parse_view
(
p
,
index
);
for
(
@
ast
.crate_directive
sub_cdir
in
cdirs
)
{
eval_crate_directive
(
p
,
sub_cdir
,
prefix
,
view_items
,
items
,
index
);
}
ret
rec
(
view_items
=
view_items
,
items
=
items
,
index
=
index
);
}
impure
fn
eval_crate_directive
(
parser
p
,
@
ast
.crate_directive
cdir
,
str
prefix
,
&
mutable
vec
[
@
ast
.view_item
]
view_items
,
&
mutable
vec
[
@
ast
.item
]
items
,
hashmap
[
ast
.ident
,
ast
.mod_index_entry
]
index
)
{
alt
(
cdir
.node
)
{
case
(
ast
.cdir_expr
(
?
e
))
{}
case
(
ast
.cdir_const
(
?
i
))
{}
case
(
ast
.cdir_src_mod
(
?
id
,
?
file_opt
))
{
auto
file_path
=
id
+
".rs"
;
alt
(
file_opt
)
{
case
(
some
[
filename
](
?
f
))
{
file_path
=
f
;
}
case
(
none
[
filename
])
{}
}
auto
full_path
=
prefix
+
std
.os
.path_sep
()
+
file_path
;
auto
p0
=
new_parser
(
p
.get_session
(),
0
,
full_path
);
auto
m0
=
parse_mod_items
(
p0
,
token
.EOF
);
auto
im
=
ast
.item_mod
(
id
,
m0
,
p
.next_def_id
());
auto
i
=
@
spanned
(
cdir
.span
,
cdir
.span
,
im
);
ast
.index_item
(
index
,
i
);
append
[
@
ast
.item
](
items
,
i
);
}
case
(
ast
.cdir_dir_mod
(
?
id
,
?
dir_opt
,
?
cdirs
))
{
auto
path
=
id
;
alt
(
dir_opt
)
{
case
(
some
[
filename
](
?
d
))
{
path
=
d
;
}
case
(
none
[
filename
])
{}
}
auto
full_path
=
prefix
+
std
.os
.path_sep
()
+
path
;
auto
m0
=
eval_crate_directives
(
p
,
cdirs
,
path
);
auto
im
=
ast
.item_mod
(
id
,
m0
,
p
.next_def_id
());
auto
i
=
@
spanned
(
cdir
.span
,
cdir
.span
,
im
);
ast
.index_item
(
index
,
i
);
append
[
@
ast
.item
](
items
,
i
);
}
case
(
ast
.cdir_view_item
(
?
vi
))
{
append
[
@
ast
.view_item
](
view_items
,
vi
);
ast
.index_view_item
(
index
,
vi
);
}
case
(
ast
.cdir_meta
(
?
mi
))
{}
case
(
ast
.cdir_syntax
(
?
pth
))
{}
case
(
ast
.cdir_auth
(
?
pth
,
?
eff
))
{}
}
}
impure
fn
parse_crate_directive
(
parser
p
)
->
ast
.crate_directive
{
auto
lo
=
p
.get_span
();
...
...
@@ -2201,10 +2127,7 @@ fn is_use_or_import(token.token t) -> bool {
expect
(
p
,
token
.SEMI
);
ret
spanned
(
lo
,
hi
,
ast
.cdir_auth
(
n
,
e
));
}
case
(
token
.CONST
)
{
auto
c
=
parse_item_const
(
p
);
ret
spanned
(
c
.span
,
c
.span
,
ast
.cdir_const
(
c
));
}
case
(
token
.MOD
)
{
p
.bump
();
auto
id
=
parse_ident
(
p
);
...
...
@@ -2267,7 +2190,8 @@ fn is_use_or_import(token.token t) -> bool {
auto
hi
=
lo
;
auto
prefix
=
std
.path
.dirname
(
lo
.filename
);
auto
cdirs
=
parse_crate_directives
(
p
,
token
.EOF
);
auto
m
=
eval_crate_directives
(
p
,
cdirs
,
prefix
);
auto
m
=
eval
.eval_crate_directives_to_mod
(
p
,
eval
.mk_env
(),
cdirs
,
prefix
);
hi
=
p
.get_span
();
expect
(
p
,
token
.EOF
);
ret
@
spanned
(
lo
,
hi
,
rec
(
module
=
m
));
...
...
src/comp/rustc.rc
浏览文件 @
b2a09562
...
...
@@ -8,6 +8,7 @@ mod front {
mod
lexer
;
mod
parser
;
mod
token
;
mod
eval
;
}
mod
middle
{
...
...
@@ -38,7 +39,6 @@ auth middle.trans.copy_args_to_allocas = impure;
auth
middle
.trans.trans_block
=
impure
;
auth
lib
.llvm
=
unsafe
;
mod
lib
{
alt
(
target_os
)
{
case
(
"win32"
)
{
...
...
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