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BridgeVisitor.java
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BridgeVisitor.java
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package bridge.mvn;
import bridge.asm.KnownType;
import bridge.asm.TypeMap;
import org.objectweb.asm.*;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Map.Entry;
import static bridge.asm.Types.*;
import static org.objectweb.asm.Opcodes.*;
final class BridgeVisitor extends ClassVisitor {
private Map<BridgeAnnotation.Data, Field> clfields, fields;
private boolean clinit, init;
final TypeMap types;
KnownType type;
BridgeData data;
HashMap<Integer, Boolean> forks = new HashMap<>();
String adopt, name, src = "Unknown Source";
int version, bridges, invocations, adjustments, removals;
BridgeVisitor(ClassVisitor delegate, TypeMap types) {
super(ASM9, delegate);
this.types = types;
}
@Override
public void visit(int version, int access, String name, String signature, String extended, String[] implemented) {
KnownType type = this.type = types.loadClass(this.name = name);
BridgeData data = this.data = (BridgeData) type.data();
if (data != null) {
if (data.adopted) {
final KnownType[] interfaces;
int i = 0, length = (interfaces = type.interfaces()).length;
if (implemented == null || implemented.length != length) implemented = new String[length];
while (i != length) implemented[i] = interfaces[i++].type.getInternalName();
extended = adopt = type.supertype().type.getInternalName();
signature = data.signature;
}
access = type.modifiers();
} else this.data = new BridgeData();
this.forks.put(this.version = version - 44, Boolean.FALSE);
super.visit(version, access, name, signature, extended, implemented);
}
@Override
public AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {
if (!visible && (descriptor.equals("Lbridge/Adopt;") || descriptor.equals("Lbridge/Synthetic;"))) {
++adjustments;
return null;
}
return super.visitAnnotation(descriptor, visible);
}
@Override
public void visitSource(String source, String debug) {
super.visitSource(this.src = source, debug);
}
private final class Field extends FieldVisitor {
final int access;
final String name, desc;
final KnownType returns;
final Object value;
private Field(int access, String name, String descriptor, String signature, Object value) {
super(ASM9, BridgeVisitor.super.visitField(access, name, descriptor, signature, value));
this.access = access;
this.name = name;
this.desc = descriptor;
this.returns = types.load(descriptor);
this.value = value;
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
if (!visible) switch (desc) {
case "Lbridge/Synthetic;":
++adjustments;
case "Lbridge/Bridges;":
case "Lbridge/Bridge;":
return null;
}
return super.visitAnnotation(desc, visible);
}
private Map<BridgeAnnotation.Data, Field> initStatic() {
if (clinit) throw new IllegalStateException("Attempted @Bridge to static field after <clinit>: " + this.name.replace('/', '.') + '.' + name + '(' + src + ')');
if (clfields == null) clfields = new HashMap<>();
return clfields;
}
private Map<BridgeAnnotation.Data, Field> initVirtual() {
if (init) throw new IllegalStateException("Attempted @Bridge to instance field after <init>: " + this.name.replace('/', '.') + '.' + name + '(' + src + ')');
if (fields == null) fields = new HashMap<>();
return fields;
}
@Override
public void visitEnd() {
super.visitEnd();
final LinkedList<BridgeAnnotation.Data> bridges;
if ((bridges = data.bridges.get(desc + name)) != null) {
boolean safe, constant = (access & ACC_FINAL) != 0;
for (BridgeAnnotation.Data data : bridges) {
safe = constant && returns.type.equals(data.returns);
FieldVisitor fv = cv.visitField(data.access, data.name, data.desc, data.sign, (safe)? value : null);
data.annotate(fv::visitAnnotation);
fv.visitEnd();
if (!safe || value == null) {
(((data.access & ACC_STATIC) != 0)? initStatic() : initVirtual()).put(data, this);
}
}
BridgeVisitor.this.bridges += bridges.size();
}
}
}
@Override
public FieldVisitor visitField(int $, String name, String descriptor, String signature, Object value) {
return new Field(data.members.getOrDefault(descriptor + name, $), name, descriptor, signature, value);
}
@Override
public MethodVisitor visitMethod(int $, String name, String descriptor, String signature, String[] exceptions) {
final int access = data.members.getOrDefault(name + descriptor, $);
return new InvocationVisitor(this, access, name, descriptor, new MethodVisitor(ASM9, super.visitMethod(access, name, descriptor, signature, exceptions)) {
private final KnownType returns = types.load(Type.getReturnType(descriptor));
private final boolean amend = name.equals("<init>");
private boolean safe = true;
private int occ = 0;
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
if (!visible) switch (desc) {
case "Lbridge/Synthetic;":
++adjustments;
case "Lbridge/Bridges;":
case "Lbridge/Bridge;":
return null;
}
return super.visitAnnotation(desc, visible);
}
@Override
public void visitTypeInsn(int opcode, String type) {
if (opcode == NEW) ++occ;
super.visitTypeInsn(opcode, type);
}
@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean isInterface) {
if (opcode == INVOKESPECIAL && name.equals("<init>")) {
if (occ > 0) {
--occ;
} else if (amend) {
if (BridgeVisitor.this.name.equals(owner)) {
safe = false;
} else if (adopt != null) {
owner = adopt;
}
}
}
super.visitMethodInsn(opcode, owner, name, desc, isInterface);
}
@Override
public void visitInsn(int opcode) {
if (opcode == RETURN) {
Map<BridgeAnnotation.Data, Field> map;
if (amend) {
init = true;
map = fields;
} else if (name.equals("<clinit>")) {
clinit = true;
map = clfields;
} else {
map = null;
}
if (map != null) {
BridgeAnnotation.Data data; Field field;
for (Entry<BridgeAnnotation.Data, Field> entry : map.entrySet()) {
data = entry.getKey();
if (safe || (data.access & ACC_FINAL) == 0) {
field = entry.getValue();
super.visitLabel(new Label());
int get = GETSTATIC, set = PUTSTATIC;
if ((data.access & ACC_STATIC) == 0) {
super.visitVarInsn(ALOAD, 0);
set = PUTFIELD;
if ((field.access & ACC_STATIC) == 0) {
super.visitInsn(DUP);
get = GETFIELD;
}
}
super.visitFieldInsn(get, BridgeVisitor.this.name, field.name, field.desc);
cast(mv, field.returns, types.load(data.returns));
super.visitFieldInsn(set, BridgeVisitor.this.name, data.name, data.desc);
}
}
}
}
super.visitInsn(opcode);
}
@Override
public void visitEnd() {
super.visitEnd();
final LinkedList<BridgeAnnotation.Data> bridges;
if ((bridges = data.bridges.get(name + descriptor)) != null) {
final KnownType[] METHOD = types.load(Type.getArgumentTypes(descriptor));
for (BridgeAnnotation.Data data : bridges) {
MethodVisitor mv = cv.visitMethod(data.access, data.name, data.desc, data.sign, data.ex);
data.annotate(mv::visitAnnotation);
mv.visitCode();
mv.visitLabel(new Label());
KnownType[] params = types.load(Type.getArgumentTypes(data.desc));
int size = 0;
int invoke = INVOKESTATIC;
if ((data.access & ACC_STATIC) == 0) {
if ((access & ACC_STATIC) == 0) {
mv.visitVarInsn(ALOAD, 0);
invoke = INVOKESPECIAL;
}
size = 1;
}
// bridge -> method
int fromIndex = data.fromIndex;
final int length = Math.min(Math.min(METHOD.length, params.length), fromIndex + data.length);
size += size(params, 0, Math.min(fromIndex, params.length));
int toIndex = 0;
while (toIndex < data.toIndex) {
cast(mv, VOID_TYPE, METHOD[toIndex++].type);
}
for (KnownType from; fromIndex < length; ++fromIndex, ++toIndex) {
mv.visitVarInsn((from = params[fromIndex]).type.getOpcode(ILOAD), size);
size += size(from);
cast(mv, from, METHOD[toIndex]);
}
while (toIndex < METHOD.length) {
cast(mv, VOID_TYPE, METHOD[toIndex++].type);
}
// method -> bridge
mv.visitMethodInsn(invoke, BridgeVisitor.this.name, name, descriptor, type.isInterface());
cast(mv, this.returns, types.load(data.returns));
mv.visitInsn(data.returns.getOpcode(IRETURN));
mv.visitMaxs(0, 0);
mv.visitEnd();
}
BridgeVisitor.this.bridges += bridges.size();
}
}
});
}
private void visitSpecial(int access, String name) {
MethodVisitor mv = this.visitMethod(access, name, "()V", null, null);
mv.visitCode();
mv.visitLabel(new Label());
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
@Override
public void visitEnd() {
if (!init && fields != null) this.visitSpecial(ACC_PUBLIC, "<init>");
if (!clinit && clfields != null) this.visitSpecial(ACC_STATIC, "<clinit>");
super.visitEnd();
}
}