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
|
package cuchaz.enigma.analysis.index;
import com.google.common.collect.Maps;
import cuchaz.enigma.translation.representation.AccessFlags;
import cuchaz.enigma.translation.representation.MethodDescriptor;
import cuchaz.enigma.translation.representation.TypeDescriptor;
import cuchaz.enigma.translation.representation.entry.ClassEntry;
import cuchaz.enigma.translation.representation.entry.MethodDefEntry;
import cuchaz.enigma.translation.representation.entry.MethodEntry;
import javax.annotation.Nullable;
import java.util.*;
public class BridgeMethodIndex implements JarIndexer {
private final EntryIndex entryIndex;
private final InheritanceIndex inheritanceIndex;
private final ReferenceIndex referenceIndex;
private final Map<MethodEntry, MethodEntry> bridgeToSpecialized = Maps.newHashMap();
private final Map<MethodEntry, MethodEntry> specializedToBridge = Maps.newHashMap();
public BridgeMethodIndex(EntryIndex entryIndex, InheritanceIndex inheritanceIndex, ReferenceIndex referenceIndex) {
this.entryIndex = entryIndex;
this.inheritanceIndex = inheritanceIndex;
this.referenceIndex = referenceIndex;
}
public void findBridgeMethods() {
// look for access and bridged methods
for (MethodEntry methodEntry : entryIndex.getMethods()) {
MethodDefEntry methodDefEntry = (MethodDefEntry) methodEntry;
AccessFlags access = methodDefEntry.getAccess();
if (access == null || !access.isSynthetic()) {
continue;
}
indexSyntheticMethod(methodDefEntry, access);
}
}
@Override
public void processIndex(JarIndex index) {
Map<MethodEntry, MethodEntry> copiedAccessToBridge = new HashMap<>(specializedToBridge);
for (Map.Entry<MethodEntry, MethodEntry> entry : copiedAccessToBridge.entrySet()) {
MethodEntry specializedEntry = entry.getKey();
MethodEntry bridgeEntry = entry.getValue();
if (bridgeEntry.getName().equals(specializedEntry.getName())) {
continue;
}
MethodEntry renamedSpecializedEntry = specializedEntry.withName(bridgeEntry.getName());
specializedToBridge.put(renamedSpecializedEntry, specializedToBridge.get(specializedEntry));
}
}
private void indexSyntheticMethod(MethodDefEntry syntheticMethod, AccessFlags access) {
MethodEntry specializedMethod = findSpecializedMethod(syntheticMethod);
if (specializedMethod == null) {
return;
}
if (access.isBridge() || isPotentialBridge(syntheticMethod, specializedMethod)) {
bridgeToSpecialized.put(syntheticMethod, specializedMethod);
specializedToBridge.put(specializedMethod, syntheticMethod);
}
}
private MethodEntry findSpecializedMethod(MethodEntry method) {
// we want to find all compiler-added methods that directly call another with no processing
// get all the methods that we call
final Collection<MethodEntry> referencedMethods = referenceIndex.getMethodsReferencedBy(method);
// is there just one?
if (referencedMethods.size() != 1) {
return null;
}
return referencedMethods.stream().findFirst().orElse(null);
}
private boolean isPotentialBridge(MethodDefEntry bridgeMethod, MethodEntry specializedMethod) {
// Bridge methods only exist for inheritance purposes, if we're private, final, or static, we cannot be inherited
AccessFlags bridgeAccess = bridgeMethod.getAccess();
if (bridgeAccess.isPrivate() || bridgeAccess.isFinal() || bridgeAccess.isStatic()) {
return false;
}
MethodDescriptor bridgeDesc = bridgeMethod.getDesc();
MethodDescriptor specializedDesc = specializedMethod.getDesc();
List<TypeDescriptor> bridgeArguments = bridgeDesc.getArgumentDescs();
List<TypeDescriptor> specializedArguments = specializedDesc.getArgumentDescs();
// A bridge method will always have the same number of arguments
if (bridgeArguments.size() != specializedArguments.size()) {
return false;
}
// Check that all argument types are bridge-compatible
for (int i = 0; i < bridgeArguments.size(); i++) {
if (!areTypesBridgeCompatible(bridgeArguments.get(i), specializedArguments.get(i))) {
return false;
}
}
// Check that the return type is bridge-compatible
return areTypesBridgeCompatible(bridgeDesc.getReturnDesc(), specializedDesc.getReturnDesc());
}
private boolean areTypesBridgeCompatible(TypeDescriptor bridgeDesc, TypeDescriptor specializedDesc) {
if (bridgeDesc.equals(specializedDesc)) {
return true;
}
// Either the descs will be equal, or they are both types and different through a generic
if (bridgeDesc.isType() && specializedDesc.isType()) {
ClassEntry bridgeType = bridgeDesc.getTypeEntry();
ClassEntry accessedType = specializedDesc.getTypeEntry();
// If the given types are completely unrelated to each other, this can't be bridge compatible
InheritanceIndex.Relation relation = inheritanceIndex.computeClassRelation(accessedType, bridgeType);
return relation != InheritanceIndex.Relation.UNRELATED;
}
return false;
}
public boolean isBridgeMethod(MethodEntry entry) {
return bridgeToSpecialized.containsKey(entry);
}
public boolean isSpecializedMethod(MethodEntry entry) {
return specializedToBridge.containsKey(entry);
}
@Nullable
public MethodEntry getBridgeFromSpecialized(MethodEntry specialized) {
return specializedToBridge.get(specialized);
}
public MethodEntry getSpecializedFromBridge(MethodEntry bridge) {
return bridgeToSpecialized.get(bridge);
}
/** Includes "renamed specialized -> bridge" entries. */
public Map<MethodEntry, MethodEntry> getSpecializedToBridge() {
return Collections.unmodifiableMap(specializedToBridge);
}
/** Only "bridge -> original name" entries. **/
public Map<MethodEntry, MethodEntry> getBridgeToSpecialized() {
return Collections.unmodifiableMap(bridgeToSpecialized);
}
}
|
