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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.turbine.binder;
import com.google.turbine.binder.bound.BoundClass;
import com.google.turbine.binder.bound.HeaderBoundClass;
import com.google.turbine.binder.bound.TypeBoundClass;
import com.google.turbine.binder.bound.TypeBoundClass.FieldInfo;
import com.google.turbine.binder.env.CompoundEnv;
import com.google.turbine.binder.env.Env;
import com.google.turbine.binder.env.LazyEnv.LazyBindingError;
import com.google.turbine.binder.lookup.CanonicalSymbolResolver;
import com.google.turbine.binder.lookup.ImportScope.ResolveFunction;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.model.TurbineVisibility;
import com.google.turbine.tree.Tree;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
/** Qualified name resolution. */
public final class Resolve {
/**
* Performs JLS 6.5.5.2 qualified type name resolution of a type with the given simple name,
* qualified by the given symbol. The search considers members that are inherited from
* superclasses or interfaces.
*/
public static ClassSymbol resolve(
Env<ClassSymbol, ? extends HeaderBoundClass> env,
ClassSymbol origin,
ClassSymbol sym,
Tree.Ident simpleName) {
return resolve(env, origin, sym, simpleName, new HashSet<>());
}
private static ClassSymbol resolve(
Env<ClassSymbol, ? extends HeaderBoundClass> env,
ClassSymbol origin,
ClassSymbol sym,
Tree.Ident simpleName,
Set<ClassSymbol> seen) {
ClassSymbol result;
if (!seen.add(sym)) {
// Optimize multiple-interface-inheritance, and don't get stuck in cycles.
return null;
}
HeaderBoundClass bound = env.get(sym);
if (bound == null) {
return null;
}
result = bound.children().get(simpleName.value());
if (result != null) {
return result;
}
if (bound.superclass() != null) {
result = resolve(env, origin, bound.superclass(), simpleName, seen);
if (result != null && visible(origin, result, env.get(result))) {
return result;
}
}
for (ClassSymbol i : bound.interfaces()) {
result = resolve(env, origin, i, simpleName, seen);
if (result != null && visible(origin, result, env.get(result))) {
return result;
}
}
return null;
}
/**
* Partially applied {@link #resolve}, returning a {@link ResolveFunction} for the given {@code
* env} and {@code origin} symbol.
*/
public static ResolveFunction resolveFunction(
Env<ClassSymbol, ? extends HeaderBoundClass> env, ClassSymbol origin) {
return new ResolveFunction() {
@Override
public ClassSymbol resolveOne(ClassSymbol base, Tree.Ident name) {
try {
return Resolve.resolve(env, origin, base, name);
} catch (LazyBindingError e) {
// This is only used for non-canonical import resolution, and if we discover a cycle
// while processing imports we want to continue and only error out if the symbol is
// never found.
return null;
}
}
};
}
static class CanonicalResolver implements CanonicalSymbolResolver {
private final String packagename;
private final CompoundEnv<ClassSymbol, BoundClass> env;
public CanonicalResolver(String packagename, CompoundEnv<ClassSymbol, BoundClass> env) {
this.packagename = packagename;
this.env = env;
}
@Override
public ClassSymbol resolveOne(ClassSymbol sym, Tree.Ident bit) {
BoundClass ci = env.get(sym);
if (ci == null) {
return null;
}
sym = ci.children().get(bit.value());
if (sym == null) {
return null;
}
if (!visible(sym)) {
return null;
}
return sym;
}
@Override
public boolean visible(ClassSymbol sym) {
TurbineVisibility visibility = TurbineVisibility.fromAccess(env.get(sym).access());
switch (visibility) {
case PUBLIC:
return true;
case PROTECTED:
case PACKAGE:
return Objects.equals(sym.packageName(), packagename);
case PRIVATE:
return false;
}
throw new AssertionError(visibility);
}
}
/**
* Performs qualified type name resolution of an instance variable with the given simple name,
* qualified by the given symbol. The search considers members that are inherited from
* superclasses or interfaces.
*/
public static FieldInfo resolveField(
Env<ClassSymbol, TypeBoundClass> env, ClassSymbol origin, ClassSymbol sym, Tree.Ident name) {
return resolveField(env, origin, sym, name, new HashSet<>());
}
private static FieldInfo resolveField(
Env<ClassSymbol, TypeBoundClass> env,
ClassSymbol origin,
ClassSymbol sym,
Tree.Ident name,
Set<ClassSymbol> seen) {
if (!seen.add(sym)) {
// Optimize multiple-interface-inheritance, and don't get stuck in cycles.
return null;
}
TypeBoundClass info = env.get(sym);
if (info == null) {
return null;
}
for (FieldInfo f : info.fields()) {
if (f.name().equals(name.value())) {
return f;
}
}
if (info.superclass() != null) {
FieldInfo field = resolveField(env, origin, info.superclass(), name, seen);
if (field != null && visible(origin, field)) {
return field;
}
}
for (ClassSymbol i : info.interfaces()) {
FieldInfo field = resolveField(env, origin, i, name, seen);
if (field != null && visible(origin, field)) {
return field;
}
}
return null;
}
/** Is the given field visible when inherited into class origin? */
private static boolean visible(ClassSymbol origin, FieldInfo info) {
return visible(origin, info.sym().owner(), info.access());
}
/** Is the given type visible when inherited into class origin? */
private static boolean visible(ClassSymbol origin, ClassSymbol sym, HeaderBoundClass info) {
return visible(origin, sym, info.access());
}
private static boolean visible(ClassSymbol origin, ClassSymbol owner, int access) {
TurbineVisibility visibility = TurbineVisibility.fromAccess(access);
switch (visibility) {
case PUBLIC:
case PROTECTED:
return true;
case PACKAGE:
return Objects.equals(owner.packageName(), origin.packageName());
case PRIVATE:
// Private members of lexically enclosing declarations are not handled,
// since this visibility check is only used for inherited members.
return owner.equals(origin);
}
throw new AssertionError(visibility);
}
private Resolve() {}
}
|
