Examples with ReturnInstruction net.runelite.asm.attributes.code.instruction.types.ReturnInstruction used on opensource projects

Example 1 with ReturnInstruction

use of net.runelite.asm.attributes.code.instruction.types.ReturnInstruction in project runelite by runelite.

the class MixinInjector method injectMethods.

private void injectMethods(ClassFile mixinCf, ClassFile cf, Map<net.runelite.asm.pool.Field, Field> shadowFields) throws InjectionException {
    // Keeps mappings between methods annotated with @Copy -> the copied method within the vanilla pack
    Map<net.runelite.asm.pool.Method, CopiedMethod> copiedMethods = new HashMap<>();
    // Handle the copy mixins first, so all other mixins know of the copies
    for (Method method : mixinCf.getMethods()) {
        Annotation copyAnnotation = method.getAnnotations().find(COPY);
        if (copyAnnotation == null) {
            continue;
        }
        String deobMethodName = (String) copyAnnotation.getElement().getValue();
        ClassFile deobCf = inject.toDeobClass(cf);
        Method deobMethod = findDeobMethod(deobCf, deobMethodName, method.getDescriptor());
        if (deobMethod == null) {
            throw new InjectionException("Failed to find the deob method " + deobMethodName + " for mixin " + mixinCf);
        }
        if (method.isStatic() != deobMethod.isStatic()) {
            throw new InjectionException("Mixin method " + method + " should be " + (deobMethod.isStatic() ? "static" : "non-static"));
        }
        // Find the vanilla class where the method to copy is in
        String obClassName = DeobAnnotations.getObfuscatedName(deobMethod.getClassFile().getAnnotations());
        ClassFile obCf = inject.getVanilla().findClass(obClassName);
        assert obCf != null : "unable to find vanilla class from obfuscated name " + obClassName;
        String obMethodName = DeobAnnotations.getObfuscatedName(deobMethod.getAnnotations());
        Signature obMethodSignature = DeobAnnotations.getObfuscatedSignature(deobMethod);
        if (obMethodName == null) {
            obMethodName = deobMethod.getName();
        }
        if (obMethodSignature == null) {
            obMethodSignature = deobMethod.getDescriptor();
        }
        Method obMethod = obCf.findMethod(obMethodName, obMethodSignature);
        if (obMethod == null) {
            throw new InjectionException("Failed to find the ob method " + obMethodName + " for mixin " + mixinCf);
        }
        if (method.getDescriptor().size() > obMethod.getDescriptor().size()) {
            throw new InjectionException("Mixin methods cannot have more parameters than their corresponding ob method");
        }
        Method copy = new Method(cf, "copy$" + deobMethodName, obMethodSignature);
        moveCode(copy, obMethod.getCode());
        copy.setAccessFlags(obMethod.getAccessFlags());
        copy.setPublic();
        copy.getExceptions().getExceptions().addAll(obMethod.getExceptions().getExceptions());
        copy.getAnnotations().getAnnotations().addAll(obMethod.getAnnotations().getAnnotations());
        cf.addMethod(copy);
        /*
				If the desc for the mixin method and the desc for the ob method
				are the same in length, assume that the mixin method is taking
				care of the garbage parameter itself.
			 */
        boolean hasGarbageValue = method.getDescriptor().size() != obMethod.getDescriptor().size() && deobMethod.getDescriptor().size() < obMethodSignature.size();
        copiedMethods.put(method.getPoolMethod(), new CopiedMethod(copy, hasGarbageValue));
        logger.debug("Injected copy of {} to {}", obMethod, copy);
    }
    // Handle the rest of the mixin types
    for (Method method : mixinCf.getMethods()) {
        boolean isClinit = "<clinit>".equals(method.getName());
        boolean isInit = "<init>".equals(method.getName());
        boolean hasInject = method.getAnnotations().find(INJECT) != null;
        // You can't annotate clinit, so its always injected
        if ((hasInject && isInit) || isClinit) {
            if (!"()V".equals(method.getDescriptor().toString())) {
                throw new InjectionException("Injected constructors cannot have arguments");
            }
            Method[] originalMethods = cf.getMethods().stream().filter(n -> n.getName().equals(method.getName())).toArray(Method[]::new);
            // If there isn't a <clinit> already just inject ours, otherwise rename it
            // This is always true for <init>
            String name = method.getName();
            if (originalMethods.length > 0) {
                name = "rl$$" + (isInit ? "init" : "clinit");
            }
            String numberlessName = name;
            for (int i = 1; cf.findMethod(name, method.getDescriptor()) != null; i++) {
                name = numberlessName + i;
            }
            Method copy = new Method(cf, name, method.getDescriptor());
            moveCode(copy, method.getCode());
            copy.setAccessFlags(method.getAccessFlags());
            copy.setPrivate();
            assert method.getExceptions().getExceptions().isEmpty();
            // Remove the call to the superclass's ctor
            if (isInit) {
                Instructions instructions = copy.getCode().getInstructions();
                ListIterator<Instruction> listIter = instructions.getInstructions().listIterator();
                for (; listIter.hasNext(); ) {
                    Instruction instr = listIter.next();
                    if (instr instanceof InvokeSpecial) {
                        InvokeSpecial invoke = (InvokeSpecial) instr;
                        assert invoke.getMethod().getName().equals("<init>");
                        listIter.remove();
                        int pops = invoke.getMethod().getType().getArguments().size() + 1;
                        for (int i = 0; i < pops; i++) {
                            listIter.add(new Pop(instructions));
                        }
                        break;
                    }
                }
            }
            setOwnersToTargetClass(mixinCf, cf, copy, shadowFields, copiedMethods);
            cf.addMethod(copy);
            // Call our method at the return point of the matching method(s)
            for (Method om : originalMethods) {
                Instructions instructions = om.getCode().getInstructions();
                ListIterator<Instruction> listIter = instructions.getInstructions().listIterator();
                for (; listIter.hasNext(); ) {
                    Instruction instr = listIter.next();
                    if (instr instanceof ReturnInstruction) {
                        listIter.previous();
                        if (isInit) {
                            listIter.add(new ALoad(instructions, 0));
                            listIter.add(new InvokeSpecial(instructions, copy.getPoolMethod()));
                        } else if (isClinit) {
                            listIter.add(new InvokeStatic(instructions, copy.getPoolMethod()));
                        }
                        listIter.next();
                    }
                }
            }
            logger.debug("Injected mixin method {} to {}", copy, cf);
        } else if (hasInject) {
            // Make sure the method doesn't invoke copied methods
            for (Instruction i : method.getCode().getInstructions().getInstructions()) {
                if (i instanceof InvokeInstruction) {
                    InvokeInstruction ii = (InvokeInstruction) i;
                    if (copiedMethods.containsKey(ii.getMethod())) {
                        throw new InjectionException("Injected methods cannot invoke copied methods");
                    }
                }
            }
            Method copy = new Method(cf, method.getName(), method.getDescriptor());
            moveCode(copy, method.getCode());
            copy.setAccessFlags(method.getAccessFlags());
            copy.setPublic();
            assert method.getExceptions().getExceptions().isEmpty();
            setOwnersToTargetClass(mixinCf, cf, copy, shadowFields, copiedMethods);
            cf.addMethod(copy);
            logger.debug("Injected mixin method {} to {}", copy, cf);
        } else if (method.getAnnotations().find(REPLACE) != null) {
            Annotation replaceAnnotation = method.getAnnotations().find(REPLACE);
            String deobMethodName = (String) replaceAnnotation.getElement().getValue();
            ClassFile deobCf = inject.toDeobClass(cf);
            Method deobMethod = findDeobMethod(deobCf, deobMethodName, method.getDescriptor());
            if (deobMethod == null) {
                throw new InjectionException("Failed to find the deob method " + deobMethodName + " for mixin " + mixinCf);
            }
            if (method.isStatic() != deobMethod.isStatic()) {
                throw new InjectionException("Mixin method " + method + " should be " + (deobMethod.isStatic() ? "static" : "non-static"));
            }
            String obMethodName = DeobAnnotations.getObfuscatedName(deobMethod.getAnnotations());
            Signature obMethodSignature = DeobAnnotations.getObfuscatedSignature(deobMethod);
            // Deob signature is the same as ob signature
            if (obMethodName == null) {
                obMethodName = deobMethod.getName();
            }
            if (obMethodSignature == null) {
                obMethodSignature = deobMethod.getDescriptor();
            }
            // Find the vanilla class where the method to copy is in
            String obClassName = DeobAnnotations.getObfuscatedName(deobMethod.getClassFile().getAnnotations());
            ClassFile obCf = inject.getVanilla().findClass(obClassName);
            Method obMethod = obCf.findMethod(obMethodName, obMethodSignature);
            assert obMethod != null : "obfuscated method " + obMethodName + obMethodSignature + " does not exist";
            if (method.getDescriptor().size() > obMethod.getDescriptor().size()) {
                throw new InjectionException("Mixin methods cannot have more parameters than their corresponding ob method");
            }
            Type returnType = method.getDescriptor().getReturnValue();
            Type deobReturnType = inject.apiTypeToDeobfuscatedType(returnType);
            if (!returnType.equals(deobReturnType)) {
                ClassFile deobReturnTypeClassFile = inject.getDeobfuscated().findClass(deobReturnType.getInternalName());
                if (deobReturnTypeClassFile != null) {
                    ClassFile obReturnTypeClass = inject.toObClass(deobReturnTypeClassFile);
                    Instructions instructions = method.getCode().getInstructions();
                    ListIterator<Instruction> listIter = instructions.getInstructions().listIterator();
                    for (; listIter.hasNext(); ) {
                        Instruction instr = listIter.next();
                        if (instr instanceof ReturnInstruction) {
                            listIter.previous();
                            CheckCast checkCast = new CheckCast(instructions);
                            checkCast.setType(new Type(obReturnTypeClass.getName()));
                            listIter.add(checkCast);
                            listIter.next();
                        }
                    }
                }
            }
            moveCode(obMethod, method.getCode());
            boolean hasGarbageValue = method.getDescriptor().size() != obMethod.getDescriptor().size() && deobMethod.getDescriptor().size() < obMethodSignature.size();
            if (hasGarbageValue) {
                int garbageIndex = obMethod.isStatic() ? obMethod.getDescriptor().size() - 1 : obMethod.getDescriptor().size();
                /*
						If the mixin method doesn't have the garbage parameter,
						the compiler will have produced code that uses the garbage
						parameter's local variable index for other things,
						so we'll have to add 1 to all loads/stores to indices
						that are >= garbageIndex.
					 */
                shiftLocalIndices(obMethod.getCode().getInstructions(), garbageIndex);
            }
            setOwnersToTargetClass(mixinCf, cf, obMethod, shadowFields, copiedMethods);
            logger.debug("Replaced method {} with mixin method {}", obMethod, method);
        }
    }
}

Example 2 with ReturnInstruction

use of net.runelite.asm.attributes.code.instruction.types.ReturnInstruction in project runelite by runelite.

the class PacketWriteDeobfuscator method isEnd.

private boolean isEnd(InstructionContext ctx) {
    // conditions where packet write ends:
    // any invoke that isn't to the packet buffer
    // any variable assignment
    // any field assignment
    // any conditional jump
    // any return
    Instruction i = ctx.getInstruction();
    if (i instanceof InvokeInstruction) {
        InvokeInstruction ii = (InvokeInstruction) i;
        Method method = ii.getMethod();
        if (!method.getClazz().equals(rw.getSecretBuffer().getPoolClass()) && !method.getClazz().equals(rw.getBuffer().getPoolClass())) {
            return true;
        }
    }
    if (i instanceof LVTInstruction) {
        LVTInstruction lvt = (LVTInstruction) i;
        if (lvt.store()) {
            return true;
        }
    }
    if (i instanceof SetFieldInstruction) {
        return true;
    }
    if (i instanceof If || i instanceof If0) {
        return true;
    }
    if (i instanceof ReturnInstruction) {
        return true;
    }
    return false;
}

Example 3 with ReturnInstruction

use of net.runelite.asm.attributes.code.instruction.types.ReturnInstruction in project runelite by runelite.

the class InjectHookMethod method findHookLocations.

private List<Integer> findHookLocations(Annotation hook, Method vanillaMethod) throws InjectionException {
    Instructions instructions = vanillaMethod.getCode().getInstructions();
    boolean end = hook.getElements().size() == 2 && hook.getElements().get(1).getValue().equals(true);
    if (end) {
        // find return
        List<Instruction> returns = instructions.getInstructions().stream().filter(i -> i instanceof ReturnInstruction).collect(Collectors.toList());
        List<Integer> indexes = new ArrayList<>();
        for (Instruction ret : returns) {
            int idx = instructions.getInstructions().indexOf(ret);
            assert idx != -1;
            indexes.add(idx);
        }
        return indexes;
    }
    if (!vanillaMethod.getName().equals("<init>")) {
        return Arrays.asList(0);
    }
    // Find index after invokespecial
    for (int i = 0; i < instructions.getInstructions().size(); ++i) {
        Instruction in = instructions.getInstructions().get(i);
        if (in.getType() == InstructionType.INVOKESPECIAL) {
            // one after
            return Arrays.asList(i + 1);
        }
    }
    throw new IllegalStateException("constructor with no invokespecial");
}