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dev.lukebemish.opensesame.compile.ConDynUtils Maven / Gradle / Ivy
Compile-time abstractions for OpenSesame, a tool for typesafe access to normally inaccessible members
package dev.lukebemish.opensesame.compile;
import dev.lukebemish.opensesame.annotations.Open;
import dev.lukebemish.opensesame.runtime.ClassProvider;
import dev.lukebemish.opensesame.runtime.OpeningMetafactory;
import java.lang.invoke.*;
import java.util.List;
public class ConDynUtils {
private final TypeProvider types;
public ConDynUtils(TypeProvider types) {
this.types = types;
}
public CD invoke(String descriptor, Object handle, Object... args) {
Object[] fullArgs = new Object[args.length+1];
System.arraycopy(args, 0, fullArgs, 1, args.length);
fullArgs[0] = handle;
return types.constantDynamic(
"invoke",
descriptor,
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(ConstantBootstraps.class),
"invoke",
MethodType.methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class, MethodHandle.class, Object[].class).descriptorString(),
false
),
fullArgs
);
}
public CD booleanConstant(boolean bool) {
return types.constantDynamic(
// booleans are fucky in ConstantDynamics. Here's an alternative...
bool ? "TRUE" : "FALSE",
Boolean.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(ConstantBootstraps.class),
"getStaticFinal",
MethodType.methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class, Class.class).descriptorString(),
false
),
types.type(Boolean.class)
);
}
public CD conDynMethodType(Object returnType, List parameterTypes) {
var fixedArityMethodType = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKEVIRTUAL,
types.internalName(MethodHandle.class),
"asCollector",
MethodType.methodType(MethodHandle.class, Class.class, int.class).descriptorString(),
false
),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodType.class),
"methodType",
MethodType.methodType(MethodType.class, Class.class, Class[].class).descriptorString(),
false
),
types.type(Class[].class),
parameterTypes.size()
);
Object[] args = new Object[parameterTypes.size() + 3];
args[0] = fixedArityMethodType;
args[1] = 0;
args[2] = returnType;
for (int i = 0; i < parameterTypes.size(); i++) {
args[i+3] = parameterTypes.get(i);
}
var manyClassloaderArg = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"filterArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, int.class, MethodHandle[].class).descriptorString(),
false
),
args
);
Object[] parameterPermutations = new Object[parameterTypes.size() + 3];
parameterPermutations[0] = manyClassloaderArg;
parameterPermutations[1] = types.methodType(MethodType.class.descriptorString(), ClassLoader.class.descriptorString());
for (int i = 0; i < parameterTypes.size() + 1; i++) {
parameterPermutations[i + 2] = 0;
}
return invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"permuteArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, MethodType.class, int[].class).descriptorString(),
false
),
parameterPermutations
);
}
public CD conDynFromFunction(T targetFunction, String targetName) {
var lookup = invoke(
MethodHandles.Lookup.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"lookup",
MethodType.methodType(MethodHandles.Lookup.class).descriptorString(),
false
)
);
var functionCtorCallsite = invoke(
CallSite.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(OpeningMetafactory.class),
"invokeKnown",
MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class, Class.class, int.class).descriptorString(),
false
),
lookup,
"",
types.methodType(types.descriptor(targetFunction)),
targetFunction,
Open.Type.CONSTRUCT.ordinal()
);
var functionCtor = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKEVIRTUAL,
types.internalName(CallSite.class),
"getTarget",
MethodType.methodType(MethodHandle.class).descriptorString(),
false
),
functionCtorCallsite
);
functionCtor = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKEVIRTUAL,
types.internalName(MethodHandle.class),
"asType",
MethodType.methodType(MethodHandle.class, MethodType.class).descriptorString(),
false
),
functionCtor,
types.methodType(ClassProvider.class.descriptorString())
);
var fetchClass = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"collectArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, int.class, MethodHandle.class).descriptorString(),
false
),
types.handle(
Opcodes.H_INVOKEINTERFACE,
types.internalName(ClassProvider.class),
"provide",
MethodType.methodType(Class.class, ClassLoader.class, String.class).descriptorString(),
true
),
0,
functionCtor
);
return invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"insertArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, int.class, Object[].class).descriptorString(),
false
),
fetchClass,
1,
targetName == null ? makeNull(types.type(String.class)) : targetName
);
}
public CD makeNull(T type) {
return types.constantDynamic(
"nullConstant",
types.descriptor(type),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(ConstantBootstraps.class),
"nullConstant",
MethodType.methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class).descriptorString(),
false
)
);
}
public CD conDynFromClass(T targetTypeType) {
Object targetType = targetTypeType;
if (types.isPrimitiveOrVoid(targetTypeType)) {
targetType = types.constantDynamic(
types.descriptor(targetTypeType),
Class.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(ConstantBootstraps.class),
"primitiveClass",
MethodType.methodType(Class.class, MethodHandles.Lookup.class, String.class, Class.class).descriptorString(),
false
)
);
}
return invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"dropArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, int.class, Class[].class).descriptorString(),
false
),
invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"constant",
MethodType.methodType(MethodHandle.class, Class.class, Object.class).descriptorString(),
false
),
types.type(Class.class),
targetType
),
0,
types.type(ClassLoader.class)
);
}
public CD conDynFromName(String targetName) {
String targetClassName;
int arrayLevels = 0;
while (targetName.startsWith("[")) {
arrayLevels++;
targetName = targetName.substring(1);
}
if (targetName.length() == 1) {
if ("ZBCSIFJDV".contains(targetName)) {
return conDynFromClass(types.type(targetName));
}
}
if (targetName.contains(";")) {
targetClassName = targetName.substring(1, targetName.length() - 1).replace('/', '.');
} else {
targetClassName = targetName;
}
var classLookupFromNameAndClassloader = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"insertArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, int.class, Object[].class).descriptorString(),
false
),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(Class.class),
"forName",
MethodType.methodType(Class.class, String.class, boolean.class, ClassLoader.class).descriptorString(),
false
),
1,
booleanConstant(false)
);
var remapper = types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(OpeningMetafactory.class),
"remapClass",
MethodType.methodType(String.class, String.class, ClassLoader.class).descriptorString(),
false
);
var twoClassloaderArguments = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"collectArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, int.class, MethodHandle.class).descriptorString(),
false
),
classLookupFromNameAndClassloader,
0,
remapper
);
var remappingLookup = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"permuteArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, MethodType.class, int[].class).descriptorString(),
false
),
twoClassloaderArguments,
types.methodType(Class.class.descriptorString(), String.class.descriptorString(), ClassLoader.class.descriptorString()),
0,
1,
1
);
var classValue = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"insertArguments",
MethodType.methodType(MethodHandle.class, MethodHandle.class, int.class, Object[].class).descriptorString(),
false
),
remappingLookup,
0,
targetClassName
);
for (int i = 0; i < arrayLevels; i++) {
classValue = invoke(
MethodHandle.class.descriptorString(),
types.handle(
Opcodes.H_INVOKESTATIC,
types.internalName(MethodHandles.class),
"filterReturnValue",
MethodType.methodType(MethodHandle.class, MethodHandle.class, MethodHandle.class).descriptorString(),
false
),
classValue,
types.handle(
Opcodes.H_INVOKEVIRTUAL,
types.internalName(Class.class),
"arrayType",
MethodType.methodType(Class.class).descriptorString(),
false
)
);
}
return classValue;
}
}
