Skip to content

Commit

Permalink
Extract runtime POD generation to a separate class
Browse files Browse the repository at this point in the history
  • Loading branch information
@ShadelessFox
ShadelessFox committed Nov 11, 2024
1 parent 7cdc710 commit c6bb2c1
Show file tree
Hide file tree
Showing 2 changed files with 494 additions and 264 deletions.
270 changes: 6 additions & 264 deletions modules/decima-rtti/src/main/java/com/shade/decima/rtti/RTTI.java
View file
Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
import com.shade.decima.rtti.data.Value;
import com.shade.util.NotNull;
import com.shade.util.Nullable;
import org.objectweb.asm.*;
import org.objectweb.asm.Handle;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
Expand All @@ -17,10 +17,11 @@
import java.lang.reflect.AnnotatedType;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

import static org.objectweb.asm.Opcodes.*;
import static org.objectweb.asm.Opcodes.H_INVOKESTATIC;

public class RTTI {
@Retention(RetentionPolicy.RUNTIME)
Expand Down Expand Up @@ -214,7 +215,7 @@ private static Map<String, Class<?>> getNamespaceTypes(@NotNull Class<?> namespa
private static RepresentationInfo getRepresentationInfo0(@NotNull Class<?> iface) {
try {
var lookup = MethodHandles.privateLookupIn(iface, MethodHandles.lookup());
var clazz = generateClass(iface, lookup);
var clazz = RuntimeTypeGenerator.generate(iface, lookup);
var constructor = lookup.findConstructor(clazz, MethodType.methodType(void.class));

return new RepresentationInfo(clazz, constructor);
Expand All @@ -223,253 +224,6 @@ private static RepresentationInfo getRepresentationInfo0(@NotNull Class<?> iface
}
}

@NotNull
private static Class<?> generateClass(
@NotNull Class<?> iface,
@NotNull MethodHandles.Lookup lookup
) throws IllegalAccessException {
var type = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
var typeName = Type.getType('L' + Type.getInternalName(iface) + "$POD;");
var interfaces = new String[]{Type.getInternalName(iface), Type.getInternalName(Compound.class)};
type.visit(V11, ACC_PUBLIC | ACC_SUPER, typeName.getInternalName(), null, "java/lang/Object", interfaces);

var init = type.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
init.visitCode();
init.visitVarInsn(ALOAD, 0);
init.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);

var getType = type.visitMethod(ACC_PUBLIC, "getType", "()Ljava/lang/Class;", null, null);
getType.visitCode();
getType.visitLdcInsn(Type.getType(iface));
getType.visitInsn(ARETURN);
getType.visitMaxs(0, 0);
getType.visitEnd();

var categoryIndex = 1;
for (CategoryInfo category : getCategories(iface)) {
var categoryType = Type.getReturnType(category.getter);
var categoryName = Type.getType('L' + typeName.getInternalName() + '$' + (categoryIndex++) + ';');

var getter = type.visitMethod(ACC_PUBLIC, category.getter.getName(), Type.getMethodDescriptor(category.getter), null, null);
getter.visitCode();
getter.visitVarInsn(ALOAD, 0);
getter.visitFieldInsn(GETFIELD, typeName.getInternalName(), category.name, categoryType.getDescriptor());
getter.visitInsn(ARETURN);
getter.visitMaxs(0, 0);
getter.visitEnd();

init.visitVarInsn(ALOAD, 0);
init.visitTypeInsn(NEW, categoryName.getInternalName());
init.visitInsn(DUP);
init.visitVarInsn(ALOAD, 0);
init.visitMethodInsn(INVOKESPECIAL, categoryName.getInternalName(), "<init>", Type.getMethodDescriptor(Type.VOID_TYPE, typeName), false);
init.visitFieldInsn(PUTFIELD, typeName.getInternalName(), category.name, categoryType.getDescriptor());

type.visitField(ACC_FINAL | ACC_SYNTHETIC, category.name, categoryType.getDescriptor(), null, null).visitEnd();
type.visitNestMember(categoryName.getInternalName());
type.visitInnerClass(categoryName.getInternalName(), null, null, 0);

generateCategory(typeName, categoryName, category, lookup);
}

for (AttributeInfo attr : getAttrsSorted(iface)) {
var attrType = Type.getReturnType(attr.getter);

type.visitField(ACC_PRIVATE, attr.fieldName(), attrType.getDescriptor(), null, null).visitEnd();

if (attr.category != null) {
continue;
}

var getter = type.visitMethod(ACC_PUBLIC, attr.getter.getName(), Type.getMethodDescriptor(attr.getter), null, null);
getter.visitCode();
getter.visitVarInsn(ALOAD, 0);
getter.visitFieldInsn(GETFIELD, typeName.getInternalName(), attr.name(), attrType.getDescriptor());
getter.visitInsn(attrType.getOpcode(IRETURN));
getter.visitMaxs(0, 0);
getter.visitEnd();

var setter = type.visitMethod(ACC_PUBLIC, attr.setter.getName(), Type.getMethodDescriptor(attr.setter), null, null);
setter.visitCode();
setter.visitVarInsn(ALOAD, 0);
setter.visitVarInsn(attrType.getOpcode(ILOAD), 1);
setter.visitFieldInsn(PUTFIELD, typeName.getInternalName(), attr.name(), attrType.getDescriptor());
setter.visitInsn(RETURN);
setter.visitMaxs(0, 0);
setter.visitEnd();
}

init.visitInsn(RETURN);
init.visitMaxs(0, 0);
init.visitEnd();

{ // toString, equals, hashCode
List<String> names = new ArrayList<>();
List<Handle> handles = new ArrayList<>();
List<AttributeInfo> arrays = new ArrayList<>();

for (AttributeInfo attr : getAttrsSorted(iface)) {
if (attr.getter.getReturnType().isArray()) {
arrays.add(attr);
continue;
}
names.add(attr.fieldName());
handles.add(new Handle(
H_GETFIELD,
typeName.getInternalName(),
attr.fieldName(),
Type.getReturnType(attr.getter).getDescriptor(),
false
));
}

List<Object> args = new ArrayList<>(2 + handles.size());
args.add(typeName);
args.add(String.join(";", names));
args.addAll(handles);

generateEquals(type, typeName, args, arrays);
generateHashCode(type, typeName, args, arrays);
generateToString(type, typeName, args);
}

type.visitEnd();

return lookup.defineClass(type.toByteArray());
}

private static void generateEquals(@NotNull ClassWriter type, @NotNull Type name, @NotNull List<Object> args, @NotNull List<AttributeInfo> arrays) {
MethodVisitor method = type.visitMethod(ACC_PUBLIC | ACC_FINAL, "equals", Type.getMethodDescriptor(Type.BOOLEAN_TYPE, Type.getType(Object.class)), null, null);
method.visitCode();
method.visitVarInsn(ALOAD, 0);
method.visitVarInsn(ALOAD, 1);
method.visitInvokeDynamicInsn("equals", Type.getMethodDescriptor(Type.BOOLEAN_TYPE, name, Type.getType(Object.class)), BOOTSTRAP_HANDLE, args.toArray());

if (!arrays.isEmpty()) {
Label fail = new Label();
method.visitJumpInsn(IFEQ, fail);

method.visitVarInsn(ALOAD, 1);
method.visitTypeInsn(CHECKCAST, name.getInternalName());
method.visitVarInsn(ASTORE, 2);

for (AttributeInfo attr : arrays) {
var attrType = Type.getReturnType(attr.getter);

method.visitVarInsn(ALOAD, 0);
method.visitFieldInsn(GETFIELD, name.getInternalName(), attr.fieldName(), attrType.getDescriptor());
method.visitVarInsn(ALOAD, 2);
method.visitFieldInsn(GETFIELD, name.getInternalName(), attr.fieldName(), attrType.getDescriptor());
method.visitMethodInsn(INVOKESTATIC, "java/util/Arrays", "equals", Type.getMethodDescriptor(Type.BOOLEAN_TYPE, attrType, attrType), false);
method.visitJumpInsn(IFEQ, fail);
}

method.visitInsn(ICONST_1);
method.visitInsn(IRETURN);

method.visitLabel(fail);
method.visitInsn(ICONST_0);
}

method.visitInsn(IRETURN);

method.visitMaxs(0, 0);
method.visitEnd();
}

private static void generateHashCode(@NotNull ClassWriter type, @NotNull Type name, @NotNull List<Object> args, @NotNull List<AttributeInfo> arrays) {
MethodVisitor method = type.visitMethod(ACC_PUBLIC | ACC_FINAL, "hashCode", Type.getMethodDescriptor(Type.INT_TYPE), null, null);
method.visitCode();
method.visitVarInsn(ALOAD, 0);
method.visitInvokeDynamicInsn("hashCode", Type.getMethodDescriptor(Type.INT_TYPE, name), BOOTSTRAP_HANDLE, args.toArray());

if (!arrays.isEmpty()) {
method.visitVarInsn(ISTORE, 1);

for (AttributeInfo attr : arrays) {
var attrType = Type.getReturnType(attr.getter);

method.visitLdcInsn(31);
method.visitVarInsn(ILOAD, 1);
method.visitInsn(IMUL);
method.visitVarInsn(ALOAD, 0);
method.visitFieldInsn(GETFIELD, name.getInternalName(), attr.fieldName(), attrType.getDescriptor());
method.visitMethodInsn(INVOKESTATIC, "java/util/Arrays", "hashCode", Type.getMethodDescriptor(Type.INT_TYPE, attrType), false);
method.visitInsn(IADD);
method.visitVarInsn(ISTORE, 1);
}

method.visitVarInsn(ILOAD, 1);
}

method.visitInsn(IRETURN);
method.visitMaxs(0, 0);
method.visitEnd();
}

private static void generateToString(@NotNull ClassWriter type, @NotNull Type name, @NotNull List<Object> args) {
MethodVisitor method = type.visitMethod(ACC_PUBLIC | ACC_FINAL, "toString", Type.getMethodDescriptor(Type.getType(String.class)), null, null);
method.visitCode();
method.visitVarInsn(ALOAD, 0);
method.visitInvokeDynamicInsn("toString", Type.getMethodDescriptor(Type.getType(String.class), name), BOOTSTRAP_HANDLE, args.toArray());
method.visitInsn(ARETURN);
method.visitMaxs(0, 0);
method.visitEnd();
}

private static void generateCategory(
@NotNull Type host,
@NotNull Type self,
@NotNull CategoryInfo category,
@NotNull MethodHandles.Lookup lookup
) throws IllegalAccessException {
var type = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
type.visit(V11, ACC_SUPER, self.getInternalName(), null, "java/lang/Object", new String[]{Type.getReturnType(category.getter).getInternalName()});
type.visitNestHost(host.getInternalName());
type.visitOuterClass(host.getInternalName(), null, null);
type.visitInnerClass(self.getInternalName(), null, null, 0);

type.visitField(ACC_FINAL | ACC_SYNTHETIC, "this$0", host.getDescriptor(), null, null).visitEnd();

var init = type.visitMethod(0, "<init>", Type.getMethodDescriptor(Type.VOID_TYPE, host), null, null);
init.visitCode();
init.visitVarInsn(ALOAD, 0);
init.visitVarInsn(ALOAD, 1);
init.visitFieldInsn(PUTFIELD, self.getInternalName(), "this$0", host.getDescriptor());
init.visitVarInsn(ALOAD, 0);
init.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
init.visitInsn(RETURN);
init.visitMaxs(0, 0);
init.visitEnd();

for (AttributeInfo attr : getAttrsSorted(category.getter.getReturnType())) {
var attrType = Type.getReturnType(attr.getter);

var getter = type.visitMethod(ACC_PUBLIC, attr.getter.getName(), Type.getMethodDescriptor(attr.getter), null, null);
getter.visitCode();
getter.visitVarInsn(ALOAD, 0);
getter.visitFieldInsn(GETFIELD, self.getInternalName(), "this$0", host.getDescriptor());
getter.visitFieldInsn(GETFIELD, host.getInternalName(), category.name() + '$' + attr.name(), attrType.getDescriptor());
getter.visitInsn(attrType.getOpcode(IRETURN));
getter.visitMaxs(0, 0);
getter.visitEnd();

var setter = type.visitMethod(ACC_PUBLIC, attr.setter.getName(), Type.getMethodDescriptor(attr.setter), null, null);
setter.visitCode();
setter.visitVarInsn(ALOAD, 0);
setter.visitFieldInsn(GETFIELD, self.getInternalName(), "this$0", host.getDescriptor());
setter.visitVarInsn(attrType.getOpcode(ILOAD), 1);
setter.visitFieldInsn(PUTFIELD, host.getInternalName(), category.name() + '$' + attr.name(), attrType.getDescriptor());
setter.visitInsn(RETURN);
setter.visitMaxs(0, 0);
setter.visitEnd();
}

type.visitEnd();

lookup.defineClass(type.toByteArray());
}

@NotNull
private static List<AttributeInfo> getAttrsSorted0(@NotNull Class<?> cls) {
List<AttributeInfo> attrs = new ArrayList<>();
Expand Down Expand Up @@ -553,8 +307,6 @@ private static void collectAttr(
category,
attr.type(),
method.getGenericReturnType(),
method,
setter,
parent,
attr.position(),
attr.offset() + offset,
Expand Down Expand Up @@ -650,8 +402,6 @@ public static final class AttributeInfo {
private final CategoryInfo category;
private final TypeName typeName;
private final java.lang.reflect.Type type;
private final Method getter;
private final Method setter;
private final Class<?> parent;

private final int position;
Expand All @@ -666,8 +416,6 @@ private AttributeInfo(
@Nullable CategoryInfo category,
@NotNull String typeName,
@NotNull java.lang.reflect.Type type,
@NotNull Method getter,
@NotNull Method setter,
@NotNull Class<?> parent,
int position,
int offset,
Expand All @@ -678,8 +426,6 @@ private AttributeInfo(
this.category = category;
this.typeName = TypeName.parse(typeName);
this.type = type;
this.getter = getter;
this.setter = setter;
this.parent = parent;
this.position = position;
this.offset = offset;
Expand All @@ -692,11 +438,6 @@ public String name() {
return name;
}

@Nullable
public CategoryInfo category() {
return category;
}

@NotNull
public TypeName typeName() {
return typeName;
Expand Down Expand Up @@ -762,7 +503,8 @@ private VarHandle fieldHandle(@NotNull Object object) {
try {
var cls = object.getClass();
var lookup = MethodHandles.privateLookupIn(cls, MethodHandles.lookup());
handle = lookup.findVarHandle(cls, fieldName(), getter.getReturnType());
var rawType = (Class<?>) (type instanceof ParameterizedType p ? p.getRawType() : type);
handle = lookup.findVarHandle(cls, fieldName(), rawType);
} catch (ReflectiveOperationException e) {
throw new IllegalStateException("Failed to get field handle", e);
}
Expand Down
Loading

0 comments on commit c6bb2c1

Please sign in to comment.