Examples with JumpInsnNode org.objectweb.asm.tree.JumpInsnNode used on opensource projects

Example 1 with JumpInsnNode

use of org.objectweb.asm.tree.JumpInsnNode in project MinecraftForge by MinecraftForge.

the class EventSubscriptionTransformer method buildEvents.

private boolean buildEvents(ClassNode classNode) throws Exception {
    // Yes, this recursively loads classes until we get this base class. THIS IS NOT A ISSUE. Coremods should handle re-entry just fine.
    // If they do not this a COREMOD issue NOT a Forge/LaunchWrapper issue.
    Class<?> parent = this.getClass().getClassLoader().loadClass(classNode.superName.replace('/', '.'));
    if (!Event.class.isAssignableFrom(parent)) {
        return false;
    }
    //Class<?> listenerListClazz = Class.forName("net.minecraftforge.fml.common.eventhandler.ListenerList", false, getClass().getClassLoader());
    Type tList = Type.getType("Lnet/minecraftforge/fml/common/eventhandler/ListenerList;");
    boolean edited = false;
    boolean hasSetup = false;
    boolean hasGetListenerList = false;
    boolean hasDefaultCtr = false;
    boolean hasCancelable = false;
    boolean hasResult = false;
    String voidDesc = Type.getMethodDescriptor(VOID_TYPE);
    String boolDesc = Type.getMethodDescriptor(BOOLEAN_TYPE);
    String listDesc = tList.getDescriptor();
    String listDescM = Type.getMethodDescriptor(tList);
    for (MethodNode method : classNode.methods) {
        if (method.name.equals("setup") && method.desc.equals(voidDesc) && (method.access & ACC_PROTECTED) == ACC_PROTECTED)
            hasSetup = true;
        if ((method.access & ACC_PUBLIC) == ACC_PUBLIC) {
            if (method.name.equals("getListenerList") && method.desc.equals(listDescM))
                hasGetListenerList = true;
            if (method.name.equals("isCancelable") && method.desc.equals(boolDesc))
                hasCancelable = true;
            if (method.name.equals("hasResult") && method.desc.equals(boolDesc))
                hasResult = true;
        }
        if (method.name.equals("<init>") && method.desc.equals(voidDesc))
            hasDefaultCtr = true;
    }
    if (classNode.visibleAnnotations != null) {
        for (AnnotationNode node : classNode.visibleAnnotations) {
            if (!hasResult && node.desc.equals("Lnet/minecraftforge/fml/common/eventhandler/Event$HasResult;")) {
                /* Add:
                     *      public boolean hasResult()
                     *      {
                     *            return true;
                     *      }
                     */
                MethodNode method = new MethodNode(ACC_PUBLIC, "hasResult", boolDesc, null, null);
                method.instructions.add(new InsnNode(ICONST_1));
                method.instructions.add(new InsnNode(IRETURN));
                classNode.methods.add(method);
                edited = true;
            } else if (!hasCancelable && node.desc.equals("Lnet/minecraftforge/fml/common/eventhandler/Cancelable;")) {
                /* Add:
                     *      public boolean isCancelable()
                     *      {
                     *            return true;
                     *      }
                     */
                MethodNode method = new MethodNode(ACC_PUBLIC, "isCancelable", boolDesc, null, null);
                method.instructions.add(new InsnNode(ICONST_1));
                method.instructions.add(new InsnNode(IRETURN));
                classNode.methods.add(method);
                edited = true;
            }
        }
    }
    if (hasSetup) {
        if (!hasGetListenerList)
            throw new RuntimeException("Event class defines setup() but does not define getListenerList! " + classNode.name);
        else
            return edited;
    }
    Type tSuper = Type.getType(classNode.superName);
    //Add private static ListenerList LISTENER_LIST
    classNode.fields.add(new FieldNode(ACC_PRIVATE | ACC_STATIC, "LISTENER_LIST", listDesc, null, null));
    /*Add:
         *      public <init>()
         *      {
         *              super();
         *      }
         */
    if (!hasDefaultCtr) {
        MethodNode method = new MethodNode(ACC_PUBLIC, "<init>", voidDesc, null, null);
        method.instructions.add(new VarInsnNode(ALOAD, 0));
        method.instructions.add(new MethodInsnNode(INVOKESPECIAL, tSuper.getInternalName(), "<init>", voidDesc, false));
        method.instructions.add(new InsnNode(RETURN));
        classNode.methods.add(method);
    }
    /*Add:
         *      protected void setup()
         *      {
         *              super.setup();
         *              if (LISTENER_LIST != NULL)
         *              {
         *                      return;
         *              }
         *              LISTENER_LIST = new ListenerList(super.getListenerList());
         *      }
         */
    MethodNode method = new MethodNode(ACC_PROTECTED, "setup", voidDesc, null, null);
    method.instructions.add(new VarInsnNode(ALOAD, 0));
    method.instructions.add(new MethodInsnNode(INVOKESPECIAL, tSuper.getInternalName(), "setup", voidDesc, false));
    method.instructions.add(new FieldInsnNode(GETSTATIC, classNode.name, "LISTENER_LIST", listDesc));
    LabelNode initListener = new LabelNode();
    method.instructions.add(new JumpInsnNode(IFNULL, initListener));
    method.instructions.add(new InsnNode(RETURN));
    method.instructions.add(initListener);
    method.instructions.add(new FrameNode(F_SAME, 0, null, 0, null));
    method.instructions.add(new TypeInsnNode(NEW, tList.getInternalName()));
    method.instructions.add(new InsnNode(DUP));
    method.instructions.add(new VarInsnNode(ALOAD, 0));
    method.instructions.add(new MethodInsnNode(INVOKESPECIAL, tSuper.getInternalName(), "getListenerList", listDescM, false));
    method.instructions.add(new MethodInsnNode(INVOKESPECIAL, tList.getInternalName(), "<init>", getMethodDescriptor(VOID_TYPE, tList), false));
    method.instructions.add(new FieldInsnNode(PUTSTATIC, classNode.name, "LISTENER_LIST", listDesc));
    method.instructions.add(new InsnNode(RETURN));
    classNode.methods.add(method);
    /*Add:
         *      public ListenerList getListenerList()
         *      {
         *              return this.LISTENER_LIST;
         *      }
         */
    method = new MethodNode(ACC_PUBLIC, "getListenerList", listDescM, null, null);
    method.instructions.add(new FieldInsnNode(GETSTATIC, classNode.name, "LISTENER_LIST", listDesc));
    method.instructions.add(new InsnNode(ARETURN));
    classNode.methods.add(method);
    return true;
}

Example 2 with JumpInsnNode

use of org.objectweb.asm.tree.JumpInsnNode in project jphp by jphp-compiler.

the class IfElseCompiler method writeBody.

private void writeBody(IfStmtToken token) {
    LabelNode end = new LabelNode();
    LabelNode elseL = new LabelNode();
    expr.writePopBoolean();
    add(new JumpInsnNode(IFEQ, token.getElseBody() != null ? elseL : end));
    expr.stackPop();
    if (token.getBody() != null) {
        expr.write(token.getBody());
    }
    if (token.getElseBody() != null) {
        add(new JumpInsnNode(GOTO, end));
        add(elseL);
        expr.write(token.getElseBody());
    }
    add(end);
    add(new LineNumberNode(token.getMeta().getEndLine(), end));
}

Example 3 with JumpInsnNode

use of org.objectweb.asm.tree.JumpInsnNode in project jphp by jphp-compiler.

the class DoCompiler method write.

@Override
public void write(DoStmtToken token) {
    expr.writeDefineVariables(token.getLocal());
    LabelNode start = expr.writeLabel(node, token.getMeta().getStartLine());
    LabelNode end = new LabelNode();
    method.pushJump(end, start);
    expr.write(token.getBody());
    method.popJump();
    expr.writeConditional(token.getCondition(), end);
    add(new JumpInsnNode(GOTO, start));
    add(end);
    add(new LineNumberNode(token.getMeta().getEndLine(), end));
    expr.writeUndefineVariables(token.getLocal());
}

Example 4 with JumpInsnNode

use of org.objectweb.asm.tree.JumpInsnNode in project jphp by jphp-compiler.

the class ReturnCompiler method write.

@Override
public void write(ReturnStmtToken token) {
    boolean isGeneratorReturn = false;
    if (token.getValue() != null && method.getGeneratorEntity() != null) {
        isGeneratorReturn = true;
        expr.writeVarLoad(LocalVariable.THIS);
        expr.writePushEnv();
        expr.writePushTraceInfo(token);
    /*env.error(
                    token.toTraceInfo(compiler.getContext()),
                    ErrorType.E_ERROR,
                    "Generators cannot return values using \"return\""
            );*/
    }
    Memory result = token.isEmpty() ? Memory.UNDEFINED : Memory.NULL;
    boolean isImmutable = method.getEntity().isImmutable();
    if (token.getValue() != null) {
        result = expr.writeExpression(token.getValue(), true, true);
        if (methodStatement.getReturnHintType() == HintType.VOID) {
            String suffix = result != null && result.isNull() ? " (did you mean \"return;\" instead of \"return null;\"?)" : "";
            env.error(token.toTraceInfo(compiler.getContext()), ErrorType.E_ERROR, "A void function must not return a value" + suffix);
        }
    }
    if (result != null) {
        if (methodStatement.getReturnHintType() == HintType.VOID) {
            if (methodStatement.isReturnOptional()) {
                env.error(token.toTraceInfo(compiler.getContext()), ErrorType.E_ERROR, "Void type cannot be nullable");
            }
        }
        if (isImmutable) {
            Memory r = method.getEntity().getResult();
            if (r == null || r.isUndefined()) {
                method.getEntity().setResult(result);
            }
        }
        expr.writePushMemory(result);
    } else {
        method.getEntity().setImmutable(false);
    }
    if (expr.stackEmpty(false)) {
        expr.writePushNull();
    } else {
        expr.writePopBoxing(false);
    }
    if (method.getEntity().isReturnReference()) {
        expr.writePushDup();
        expr.writePushEnv();
        expr.writePushTraceInfo(token);
        expr.writeSysStaticCall(InvokeHelper.class, "checkReturnReference", void.class, Memory.class, Environment.class, TraceInfo.class);
    } else {
        expr.writePopImmutable();
    }
    if (isGeneratorReturn) {
        expr.writeSysDynamicCall(Generator.class, "setReturn", Memory.class, Environment.class, TraceInfo.class, Memory.class);
    }
    if (!method.getTryStack().empty()) {
        LocalVariable variable = method.getLocalVariable("~result~");
        if (variable == null) {
            variable = method.addLocalVariable("~result~", null, Memory.class);
        }
        expr.writeVarStore(variable, false, false);
        add(new JumpInsnNode(GOTO, method.getTryStack().peek().getReturnLabel()));
    } else {
        add(new InsnNode(ARETURN));
        // removeStackFrame();
        expr.stackPop();
    }
}

Example 5 with JumpInsnNode

use of org.objectweb.asm.tree.JumpInsnNode in project jphp by jphp-compiler.

the class SwitchCompiler method write.

@Override
public void write(SwitchStmtToken token) {
    expr.writeDefineVariables(token.getLocal());
    LabelNode l = new LabelNode();
    LabelNode end = new LabelNode();
    add(l);
    LocalVariable switchValue = method.addLocalVariable("~switch~" + method.nextStatementIndex(Memory.class), l, Memory.class);
    switchValue.setEndLabel(end);
    LabelNode[][] jumps = new LabelNode[token.getCases().size() + 1][2];
    int i = 0;
    for (CaseStmtToken one : token.getCases()) {
        // checkLabel, bodyLabel
        jumps[i] = new LabelNode[] { new LabelNode(), new LabelNode() };
        if (i == jumps.length - 1)
            jumps[i] = new LabelNode[] { end, end };
        i++;
    }
    jumps[jumps.length - 1] = new LabelNode[] { end, end };
    method.pushJump(end, end);
    expr.writeExpression(token.getValue(), true, false);
    expr.writePopBoxing();
    expr.writeVarStore(switchValue, false, false);
    i = 0;
    for (CaseStmtToken one : token.getCases()) {
        // conditional
        add(jumps[i][0]);
        if (one.getConditional() != null) {
            expr.writeVarLoad(switchValue);
            expr.writeExpression(one.getConditional(), true, false);
            expr.writeSysDynamicCall(Memory.class, "equal", Boolean.TYPE, expr.stackPeek().type.toClass());
            add(new JumpInsnNode(IFEQ, jumps[i + 1][0]));
            expr.stackPop();
        }
        // if is done...
        add(new JumpInsnNode(GOTO, jumps[i][1]));
        i++;
    }
    i = 0;
    for (CaseStmtToken one : token.getCases()) {
        add(jumps[i][1]);
        expr.writeDefineVariables(one.getLocals());
        expr.write(BodyStmtToken.class, one.getBody());
        i++;
        expr.writeUndefineVariables(one.getLocals());
    }
    method.popJump();
    add(end);
    add(new LineNumberNode(token.getMeta().getEndLine(), end));
    method.prevStatementIndex(Memory.class);
    expr.writeUndefineVariables(token.getLocal());
}