Example usage for org.objectweb.asm MethodVisitor visitLdcInsn

Introduction

In this page you can find the example usage for org.objectweb.asm MethodVisitor visitLdcInsn.

Prototype

public void visitLdcInsn(final Object value) 

Source Link

Document

Visits a LDC instruction.

Usage

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.NumberType.java

License:Open Source License

@Override
public Type ldc(final MethodVisitor method, final Object c) {
    assert c instanceof Double;

    final double value = (Double) c;

    if (Double.doubleToLongBits(value) == 0L) { // guard against -0.0
        method.visitInsn(DCONST_0);/*from w w  w . ja  v a 2  s . co m*/
    } else if (value == 1.0) {
        method.visitInsn(DCONST_1);
    } else {
        method.visitLdcInsn(value);
    }

    return NUMBER;
}

---

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.ObjectType.java

License:Open Source License

@Override
public Type ldc(final MethodVisitor method, final Object c) {
    if (c == null) {
        method.visitInsn(ACONST_NULL);//from   ww  w  . ja va  2  s.c  om
    } else if (c instanceof Undefined) {
        return loadUndefined(method);
    } else if (c instanceof String) {
        method.visitLdcInsn(c);
        return STRING;
    } else if (c instanceof Handle) {
        method.visitLdcInsn(c);
        return Type.typeFor(MethodHandle.class);
    } else {
        throw new UnsupportedOperationException(
                "implementation missing for class " + c.getClass() + " value=" + c);
    }

    return Type.OBJECT;
}

---

From source file:com.github.bmsantos.core.cola.injector.ErrorsClassVisitor.java

License:Apache License

private void injectTestMethod() {

    final MethodVisitor mv = classVisitor.visitMethod(ACC_PUBLIC, METHOD_NAME, "()V", null, null);
    mv.visitCode();//from w w  w  . j  av  a2 s. co m
    mv.visitVarInsn(ALOAD, 0);
    mv.visitLdcInsn(errors);
    mv.visitMethodInsn(INVOKESTATIC, "org/junit/Assert", "fail", "(Ljava/lang/String;)V", false);
    mv.visitInsn(RETURN);
    mv.visitAnnotation("Lorg/junit/Test;", true);
    mv.visitEnd();
    mv.visitMaxs(0, 0);
}

---

From source file:com.github.bmsantos.core.cola.injector.InjectorClassVisitor.java

License:Apache License

private void injectTestMethod(final String feature, final String scenario, final String story,
        final String projectionValues, final String reports) {

    final MethodVisitor mv = infoClassVisitor.visitMethod(ACC_PUBLIC,
            String.format(METHOD_NAME_FORMAT, feature, scenario), "()V", null, null);
    mv.visitCode();//from ww w .j a va  2s . co  m
    mv.visitVarInsn(ALOAD, 0);
    mv.visitLdcInsn(feature);
    mv.visitLdcInsn(scenario);
    mv.visitLdcInsn(story);
    mv.visitLdcInsn(projectionValues);
    mv.visitLdcInsn(reports);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESTATIC, "com/github/bmsantos/core/cola/story/processor/StoryProcessor", "process",
            "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V",
            false);
    mv.visitInsn(RETURN);
    mv.visitAnnotation("Lorg/junit/Test;", true);
    mv.visitEnd();
    mv.visitMaxs(0, 0);
}

---

From source file:com.github.bmsantos.core.cola.injector.InjectorClassVisitor.java

License:Apache License

private void injectIgnoreMethod(final String feature, final String scenario) {
    final MethodVisitor mv = infoClassVisitor.visitMethod(ACC_PUBLIC,
            String.format(IGNORED_METHOD_NAME_FORMAT, feature, scenario), "()V", null, null);
    mv.visitCode();/*from   w ww. java 2  s.c  om*/
    mv.visitVarInsn(ALOAD, 0);
    mv.visitLdcInsn(feature);
    mv.visitLdcInsn(scenario);
    mv.visitMethodInsn(INVOKESTATIC, "com/github/bmsantos/core/cola/story/processor/StoryProcessor", "ignore",
            "(Ljava/lang/String;Ljava/lang/String;)V", false);
    mv.visitInsn(RETURN);
    mv.visitAnnotation("Lorg/junit/Test;", true);
    mv.visitEnd();
    mv.visitMaxs(0, 0);
}

---

From source file:com.github.jasmo.obfuscate.ScrambleStrings.java

License:Open Source License

private void createUnscramble() {
    MethodVisitor mv = unscrambleClass.visitMethod(ACC_PUBLIC | ACC_STATIC, CALL_NAME, CALL_DESC, null, null);
    mv.visitCode();/*from   ww w  . j  a  v  a2  s .  c  o m*/
    mv.visitTypeInsn(NEW, "java/lang/String");
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESTATIC, "java/util/Base64", "getDecoder", "()Ljava/util/Base64$Decoder;", false);
    mv.visitFieldInsn(GETSTATIC, unscrambleClass.name, FIELD_NAME, "[Ljava/lang/String;");
    mv.visitVarInsn(ILOAD, 0);
    mv.visitInsn(AALOAD);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/Base64$Decoder", "decode", "(Ljava/lang/String;)[B", false);
    mv.visitLdcInsn("UTF-8");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/String", "<init>", "([BLjava/lang/String;)V", false);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

---

From source file:com.github.megatronking.stringfog.plugin.StringFogClassVisitor.java

License:Apache License

@Override
public void visitEnd() {
    if (!mIgnoreClass && !isClInitExists && !mStaticFinalFields.isEmpty()) {
        MethodVisitor mv = super.visitMethod(Opcodes.ACC_STATIC, "<clinit>", "()V", null, null);
        mv.visitCode();//  w ww .j  a va  2 s .co  m
        // Here init static final fields.
        for (ClassStringField field : mStaticFinalFields) {
            if (!canEncrypted(field.value)) {
                continue;
            }
            String originValue = field.value;
            String encryptValue = mStringFogImpl.encrypt(originValue, mKey);
            mMappingPrinter.output(getJavaClassName(), originValue, encryptValue);
            mv.visitLdcInsn(encryptValue);
            mv.visitMethodInsn(Opcodes.INVOKESTATIC, mFogClassName, "decrypt",
                    "(Ljava/lang/String;)Ljava/lang/String;", false);
            mv.visitFieldInsn(Opcodes.PUTSTATIC, mClassName, field.name, ClassStringField.STRING_DESC);
        }
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(1, 0);
        mv.visitEnd();
    }
    super.visitEnd();
}

---

From source file:com.github.rgcjonas.kuemmelgtr.core.Compiler.java

License:Open Source License

private static void compileCommon(TokenSource<RPNToken> source, MethodVisitor method, String variable)
        throws ParsingError {
    method.visitCode();//from w ww  .ja v  a  2 s.  c  o  m

    // we now can compile our token stream
    int currentStackSize = 0; // we keep track of the current stack size to throw errors if we encounter an invalid instruction
    RPNToken t;
    while ((t = source.nextToken()) != null) {
        if (t instanceof RPNToken.Operand) {
            // we push it onto the stack
            method.visitLdcInsn(((RPNToken.Operand) t).getValue());
            currentStackSize++;
        } else if (t instanceof RPNToken.Operator) {
            RPNToken.Operator op = (RPNToken.Operator) t;

            if (currentStackSize < op.getNumOperands())
                throw new ParsingError(t.getSrcLine(), t.getSrcColumn(), "Missing operand(s)");

            switch (op.getName()) {
            case "_add":
                method.visitInsn(Opcodes.DADD);
                currentStackSize--;
                break;
            case "_mult":
                method.visitInsn(Opcodes.DMUL);
                currentStackSize--;
                break;
            case "_sub":
                method.visitInsn(Opcodes.DSUB);
                currentStackSize--;
                break;
            case "_div":
                method.visitInsn(Opcodes.DDIV);
                currentStackSize--;
                break;
            case "_pow":
                method.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Math", "pow", "(DD)D");
                currentStackSize--;
                break;
            default:
                //HACK: support every function in java/lang/Math. Will be way more performant than any lookup-and-evaluate
                //TODO: implement more functions inline
                if (currentStackSize < 1)
                    throw new ParsingError(t.getSrcLine(), t.getSrcColumn(), "Missing operand");
                try {
                    Method meth = Math.class.getDeclaredMethod(op.getName(), double.class); // just check if it's available and hope it returns a double
                    if (meth.getReturnType() != double.class)
                        throw new NoSuchMethodException(); // we don't want to blow up at runtime, do we?

                    method.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Math", op.getName(), "(D)D");
                } catch (NoSuchMethodException e) {
                    // we do not give up. The method may be available at runtime.
                    method.visitVarInsn(Opcodes.ALOAD, 0);
                    method.visitInsn(Opcodes.DUP_X2); // swap the this pointer and double
                    method.visitInsn(Opcodes.POP);
                    method.visitLdcInsn(op.getName());
                    method.visitLdcInsn((int) op.getSrcLine());
                    method.visitLdcInsn((int) op.getSrcColumn());
                    method.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                            CompiledClassBase.class.getName().replace('.', '/'), "resolveAndEvaluateFunction",
                            "(DLjava/lang/String;II)D");
                }
            }
        } else if (t instanceof RPNToken.VariableRecall) {
            // maybe, maybe the variable is an argument we can load
            if (variable != null && ((RPNToken.VariableRecall) t).getName().equalsIgnoreCase(variable)) {
                method.visitVarInsn(Opcodes.DLOAD, 1);
            } else {
                // we let our parent class do the hard work
                method.visitVarInsn(Opcodes.ALOAD, 0);
                method.visitLdcInsn(((RPNToken.VariableRecall) t).getName());
                method.visitLdcInsn(t.getSrcLine());
                method.visitLdcInsn(t.getSrcColumn());
                method.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                        CompiledClassBase.class.getName().replace('.', '/'), "getVariable",
                        "(Ljava/lang/String;II)D");
            }
            currentStackSize++;
        } else if (t instanceof RPNToken.VariableAssignment) {
            // also defer to our parent class
            // we do not give up. The method may be available at runtime.
            method.visitVarInsn(Opcodes.ALOAD, 0);
            method.visitInsn(Opcodes.DUP_X2); // swap the this pointer and double
            method.visitInsn(Opcodes.POP);
            method.visitLdcInsn(((RPNToken.VariableAssignment) t).getVariableName());
            method.visitLdcInsn(t.getSrcLine());
            method.visitLdcInsn(t.getSrcColumn());
            method.visitMethodInsn(Opcodes.INVOKEVIRTUAL, CompiledClassBase.class.getName().replace('.', '/'),
                    "setVariable", "(DLjava/lang/String;II)D");
        } else {
            throw new ParsingError(t.getSrcLine(), t.getSrcColumn(), "Unknown instruction: " + t);
        }
    }

    if (currentStackSize != 1)
        throw new ParsingError(0, 0, "Expected stack to be one value, found " + currentStackSize);

    method.visitInsn(Opcodes.DRETURN);

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

---

From source file:com.github.stokito.gag.agent.AnswerToLifeGenerator.java

License:Apache License

@Override
public MethodVisitor visitMethod(int access, String name, String desc, String sig, String[] exceptions) {

    MethodVisitor mv = writer().visitMethod(access, name, desc, sig, exceptions);
    mv.visitCode();/*ww  w.j  a  v  a2s .com*/

    MethodInfo method = classInfo().getMethod(name, desc);
    for (LocalVarInfo param : method.getLocalVars()) {
        AnnoInfo anno = param.getAnnoFor(ANSWER_TYPE);
        if (anno == null) {
            continue;
        }

        Type paramType = param.getType();
        switch (paramType.getSort()) {
        case Type.INT:
        case Type.BYTE:
        case Type.CHAR:
        case Type.SHORT:
            mv.visitLdcInsn(FORTY_TWO);
            mv.visitVarInsn(ISTORE, param.getIndex());
            break;
        case Type.LONG:
            mv.visitLdcInsn((long) FORTY_TWO);
            mv.visitVarInsn(LSTORE, param.getIndex());
            break;
        case Type.DOUBLE:
            mv.visitLdcInsn((double) FORTY_TWO);
            mv.visitVarInsn(DSTORE, param.getIndex());
            break;
        case Type.FLOAT:
            mv.visitLdcInsn((float) FORTY_TWO);
            mv.visitVarInsn(FSTORE, param.getIndex());
            break;
        case Type.OBJECT:
            visitObject(mv, param);
            break;
        default:
            throwUnsupportedException(param);
        }

        setInstrumented(true);
    }

    mv.visitEnd();
    return mv;
}

---

From source file:com.github.stokito.gag.agent.AnswerToLifeGenerator.java

License:Apache License

/** TODO: Support BigDecimal and BigInteger. */
private void visitObject(MethodVisitor mv, LocalVarInfo param) {
    Type paramType = param.getType();
    if (Type.getType(Character.class).equals(paramType)) {
        mv.visitLdcInsn((char) FORTY_TWO);
        mv.visitMethodInsn(INVOKESTATIC, paramType.getInternalName(), "valueOf",
                "(C)L" + paramType.getInternalName() + ";");
        mv.visitVarInsn(ASTORE, param.getIndex());
    } else if (supportedValueOfTypes.contains(paramType)) {
        mv.visitLdcInsn(String.valueOf(FORTY_TWO));
        mv.visitMethodInsn(INVOKESTATIC, paramType.getInternalName(), "valueOf",
                "(Ljava/lang/String;)L" + paramType.getInternalName() + ";");
        mv.visitVarInsn(ASTORE, param.getIndex());
    } else {//from w  ww .  j  a  v a  2 s  .c o  m
        throwUnsupportedException(param);
    }
}

---

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