blob: 8220da5d6041169193e0fa0ca9c263e07e9c5a0d (
plain)
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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/**
** \file object/binder.cc
** \brief Implementation of object::Binder.
*/
#include <ast/all.hh>
#include <object/binder.hh>
namespace object
{
/*---------.
| Visits. |
`---------*/
/* Handle the case of `self'. If the variable is not named `self', handle it
like the normal `Binder'. If it is `self', it must be bound to a definiton
site, unless:
* it is inside a method,
* AND `self` is not overridden.
If those conditions are met, `self' is an implicitly defined instance of
the class.

Variable `self' will have a meaningful definition after the object
constructs have been desugared. */
void Binder::operator()(ast::SimpleVar& e)
{
// FIXME DONE: Some code was deleted here.
misc::symbol test_self("self");
if (e.name_get() == test_self && within_method_dec_ && !overrided_self_)
{
e.def_set(nullptr);
}
else
{
super_type::operator()(e);
}
}
// Handle the case of `Object'.
void Binder::operator()(ast::NameTy& e)
{
// FIXME DONE: Some code was deleted here.
misc::symbol test_obj("Object");
if (e.name_get() == test_obj)
{
e.def_set(nullptr);
}
else
{
super_type::operator()(e);
}
}
/*---------------.
| Visiting Exp. |
`---------------*/
void Binder::operator()(ast::ForExp& e)
{
bool saved_within_class_ty = within_class_ty_;
within_class_ty_ = false;
super_type::operator()(e);
within_class_ty_ = saved_within_class_ty;
}
/*-------------------.
| Visiting ClassTy. |
`-------------------*/
void Binder::operator()(ast::ClassTy& e)
{
// FIXME DONE: Some code was deleted here (Scope begins).
begin_scope();
e.super_get().accept(*this);
bool saved_within_class_ty = within_class_ty_;
within_class_ty_ = true;
bool saved_within_method_dec = within_method_dec_;
within_method_dec_ = false;
e.chunks_get().accept(*this);
within_method_dec_ = saved_within_method_dec;
within_class_ty_ = saved_within_class_ty;
// FIXME DONE: Some code was deleted here (Scope ends).
end_scope();
}
/*---------------.
| Visiting Dec. |
`---------------*/
void Binder::operator()(ast::VarDec& e)
{
if (within_class_ty_)
{
within_class_ty_ = false;
// Don't bind class attributes.
super_type::super_type::operator()(e);
within_class_ty_ = true;
}
else
{
// But still bind other variable declarations.
super_type::operator()(e);
if (e.name_get() == "self" && within_method_dec_)
overrided_self_ = true;
}
}
void Binder::operator()(ast::FunctionChunk& e)
{
chunk_visit<ast::FunctionDec>(e);
}
template <class D> void Binder::chunk_visit(ast::Chunk<D>& e)
{
// Shorthand.
using chunk_type = ast::Chunk<D>;
// FIXME: Some code was deleted here (Two passes: once on headers, then on bodies).
for (auto machala : e)
{
if (dynamic_cast<ast::MethodDec*>(machala))
{
scoped_map_fun_.put(machala->name_get(), machala);
}
}
super_type::operator()(e);
}
// This trampoline is needed, since `virtual' and `template' cannot
// be mixed.
template <>
void Binder::visit_dec_header<ast::FunctionDec>(ast::FunctionDec& e)
{
// FIXME DONE: Some code was deleted here (Call the super type).
super_type::operator()(e);
}
// Compute the bindings of this function's body.
template <> void Binder::visit_dec_body<ast::FunctionDec>(ast::FunctionDec& e)
{
bool saved_within_class_ty = within_class_ty_;
within_class_ty_ = false;
bool saved_within_method_dec = within_method_dec_;
within_method_dec_ = false;
// FIXME DONE: Some code was deleted here (Call the super type).
super_type::operator()(e);
within_method_dec_ = saved_within_method_dec;
within_class_ty_ = saved_within_class_ty;
}
/* We can't bind methods definitions without types, so we don't
store them. Nonetheless, object::Binder must still recurse
through the children of ast::MethodChunk to bind other names.
Note that as we defer the binding of methods to the
type-checkimg, there is no need to visit method in two-pass (like
bind::Binder does for functions for instance). */
void Binder::operator()(ast::MethodDec& e)
{
// FIXME DONE: Some code was deleted here (Scope begins).
begin_scope();
bool saved_within_class_ty = within_class_ty_;
within_class_ty_ = false;
bool saved_within_method_dec = within_method_dec_;
within_method_dec_ = true;
bool saved_overrided_self = overrided_self_;
overrided_self_ = false;
ast::DefaultVisitor::operator()(static_cast<ast::FunctionDec&>(e));
within_method_dec_ = saved_within_method_dec;
within_class_ty_ = saved_within_class_ty;
overrided_self_ = saved_overrided_self;
// FIXME DONE: Some code was deleted here (Scope ends).
end_scope();
}
} // namespace object
|
