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
|
/*
* Copyright 2017 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.deps;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.turbine.binder.Binder.BindingResult;
import com.google.turbine.binder.ClassPath;
import com.google.turbine.binder.bound.TypeBoundClass;
import com.google.turbine.binder.bytecode.BytecodeBoundClass;
import com.google.turbine.binder.env.CompoundEnv;
import com.google.turbine.binder.env.Env;
import com.google.turbine.binder.env.SimpleEnv;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.bytecode.ClassFile;
import com.google.turbine.bytecode.ClassFile.FieldInfo;
import com.google.turbine.bytecode.ClassFile.InnerClass;
import com.google.turbine.bytecode.ClassWriter;
import com.google.turbine.model.TurbineFlag;
import java.util.LinkedHashSet;
import java.util.Set;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Collects the minimal compile-time API for symbols in the supertype closure of compiled classes.
* This allows header compilations to be performed against a classpath containing only direct
* dependencies and no transitive dependencies.
*/
public final class Transitive {
public static ImmutableMap<String, byte[]> collectDeps(
ClassPath bootClassPath, BindingResult bound) {
ImmutableMap.Builder<String, byte[]> transitive = ImmutableMap.builder();
for (ClassSymbol sym : superClosure(bound)) {
BytecodeBoundClass info = bound.classPathEnv().get(sym);
if (info == null) {
// the symbol wasn't loaded from the classpath
continue;
}
if (bootClassPath.env().get(sym) != null) {
// don't export symbols loaded from the bootclasspath
continue;
}
transitive.put(
sym.binaryName(), ClassWriter.writeClass(trimClass(info.classFile(), info.jarFile())));
}
return transitive.buildOrThrow();
}
/**
* Removes information from repackaged classes that will not be needed by upstream compilations.
*/
public static ClassFile trimClass(ClassFile cf, @Nullable String jarFile) {
// drop non-constant fields
ImmutableList.Builder<FieldInfo> fields = ImmutableList.builder();
for (FieldInfo f : cf.fields()) {
if (f.value() != null) {
fields.add(f);
}
}
// Remove InnerClass attributes that are unnecessary after pruning the types they refer to.
// To do this for javac, we would have to scan all remaining signatures and preserve attributes
// for reachable inner classes, but turbine only needs the attributes for the immediate
// children or parent of the current class.
ImmutableList.Builder<InnerClass> innerClasses = ImmutableList.builder();
for (InnerClass i : cf.innerClasses()) {
if (i.innerClass().equals(cf.name()) || i.outerClass().equals(cf.name())) {
innerClasses.add(i);
}
}
// Include the original jar file name when repackaging transitive deps. If the same transitive
// dep is repackaged more than once, keep the original name.
String transitiveJar = cf.transitiveJar();
if (transitiveJar == null) {
transitiveJar = jarFile;
}
return new ClassFile(
cf.access(),
cf.majorVersion(),
cf.name(),
cf.signature(),
cf.superName(),
cf.interfaces(),
cf.permits(),
// drop methods, except for annotations where we need to resolve key/value information
(cf.access() & TurbineFlag.ACC_ANNOTATION) == TurbineFlag.ACC_ANNOTATION
? cf.methods()
: ImmutableList.of(),
fields.build(),
// unnecessary annotations are dropped during class reading, the only remaining ones are
// well-known @interface meta-annotations (e.g. @Retention, etc.)
cf.annotations(),
innerClasses.build(),
cf.typeAnnotations(),
/* module= */ null,
/* nestHost= */ null,
/* nestMembers= */ ImmutableList.of(),
/* record= */ null,
/* transitiveJar = */ transitiveJar);
}
private static Set<ClassSymbol> superClosure(BindingResult bound) {
Env<ClassSymbol, TypeBoundClass> env =
CompoundEnv.<ClassSymbol, TypeBoundClass>of(new SimpleEnv<>(bound.units()))
.append(bound.classPathEnv());
Set<ClassSymbol> closure = new LinkedHashSet<>();
for (ClassSymbol sym : bound.units().keySet()) {
addSuperTypes(closure, env, sym);
}
Set<ClassSymbol> directChildren = new LinkedHashSet<>();
for (ClassSymbol sym : closure) {
TypeBoundClass info = env.get(sym);
if (info != null) {
directChildren.addAll(info.children().values());
}
}
closure.addAll(directChildren);
return closure;
}
private static void addSuperTypes(
Set<ClassSymbol> closure, Env<ClassSymbol, TypeBoundClass> env, ClassSymbol sym) {
if (!closure.add(sym)) {
return;
}
TypeBoundClass info = env.get(sym);
if (info == null) {
return;
}
if (info.superclass() != null) {
addSuperTypes(closure, env, info.superclass());
}
for (ClassSymbol i : info.interfaces()) {
addSuperTypes(closure, env, i);
}
}
private Transitive() {}
}
|
