Example usage for org.objectweb.asm Label Label

Introduction

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

Prototype

public Label() 

Source Link

Document

Constructs a new label.

Usage

From source file:edu.mit.streamjit.util.bytecode.MethodUnresolver.java

License:Open Source License

private void createLabels() {
    for (BasicBlock b : method.basicBlocks())
        labels.put(b, new LabelNode(new Label()));
}

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From source file:edu.ubc.mirrors.holograms.HologramMethodGenerator.java

License:Open Source License

@Override
public void visitCode() {
    super.visitCode();

    if (name.equals("<clinit>")) {
        initializeStaticFields(owner, this);

        // Skip the static initializer for classes that were already defined - 
        // these will have already been executed when
        // loading the original class and state will be proxied by ClassMirrors instead.
        Label afterEarlyReturn = new Label();
        new MethodHandle() {
            protected void methodCall() throws Throwable {
                ((ClassMirror) null).initialized();
            }/*from  ww  w. j av a  2 s.c om*/
        }.invoke(this);
        ifeq(afterEarlyReturn);
        areturn(Type.VOID_TYPE);
        mark(afterEarlyReturn);
        visitFrame(Opcodes.F_NEW, 0, new Object[0], 0, new Object[0]);
    }

    if (name.equals("<init>")) {
        lvs.newLocal(instanceMirrorType);

        if (owner.equals(getHologramType(Throwable.class))) {
            load(0, owner);
            load((methodType.getArgumentsAndReturnSizes() >> 2) - 1, instanceMirrorType);
            putfield(owner.getInternalName(), "mirror", Type.getDescriptor(ObjectMirror.class));
        }
    }
}

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From source file:erjang.beam.CompilerVisitor.java

License:Apache License

private static void make_invoke_method(ClassWriter cw, String outer_name, String mname, int arity, boolean proc,
        int freevars, Type returnType, boolean isTailCall) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "invoke", EUtil.getSignature(arity - freevars, true), null,
            PAUSABLE_EX);//from   w  ww .ja v  a2  s.c  o m
    mv.visitCode();
    if (proc) {
        mv.visitVarInsn(ALOAD, 1);
    }
    for (int i = 0; i < arity - freevars; i++) {
        mv.visitVarInsn(ALOAD, i + 2);
    }
    for (int i = 0; i < freevars; i++) {
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, outer_name + "$FN_" + mname, "fv" + i, EOBJECT_DESC);
    }
    mv.visitMethodInsn(INVOKESTATIC, outer_name, mname, EUtil.getSignature(arity, proc, returnType));

    if (isTailCall) {
        mv.visitVarInsn(ASTORE, arity + 2);

        Label done = new Label();
        Label loop = new Label();
        mv.visitLabel(loop);
        mv.visitVarInsn(ALOAD, arity + 2);
        if (EProc.TAIL_MARKER == null) {
            mv.visitJumpInsn(IFNONNULL, done);
        } else {
            mv.visitFieldInsn(GETSTATIC, EPROC_NAME, "TAIL_MARKER", EOBJECT_DESC);
            mv.visitJumpInsn(IF_ACMPNE, done);
        }

        // load proc
        mv.visitVarInsn(ALOAD, 1);
        mv.visitFieldInsn(GETFIELD, EPROC_NAME, "tail", EFUN_DESCRIPTOR);
        mv.visitVarInsn(ALOAD, 1);

        mv.visitMethodInsn(INVOKEVIRTUAL, EFUN_NAME, "go", GO_DESC);
        mv.visitVarInsn(ASTORE, arity + 2);

        mv.visitJumpInsn(GOTO, loop);

        mv.visitLabel(done);
        mv.visitVarInsn(ALOAD, arity + 2);
    }

    mv.visitInsn(ARETURN);
    mv.visitMaxs(arity + 2, arity + 2);
    mv.visitEnd();
}

---

From source file:erjang.EFun.java

License:Apache License

private static void make_cast_method(ClassWriter cw, int n) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "cast",
            "(" + EOBJECT_DESC + ")L" + EFUN_NAME + n + ";", null, null);
    mv.visitCode();/* w w w  .  java 2  s. c om*/

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(INSTANCEOF, EFUN_NAME + n);

    Label fail = new Label();

    mv.visitJumpInsn(Opcodes.IFEQ, fail);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(Opcodes.CHECKCAST, EFUN_NAME + n);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(fail);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

---

From source file:erjang.EFun.java

License:Apache License

private static void make_invoke_method(ClassWriter cw, String self_type, int arity) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "invoke", EUtil.getSignature(arity, true), null, PAUSABLE_EX);
    mv.visitCode();/*from  www  .jav a2s .co  m*/
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    for (int i = 0; i < arity; i++) {
        mv.visitVarInsn(ALOAD, i + 2);
    }
    mv.visitMethodInsn(INVOKEVIRTUAL, self_type, "invoke_tail", EUtil.getSignature(arity, true));
    mv.visitVarInsn(ASTORE, arity + 2);

    Label done = new Label();
    Label loop = new Label();
    mv.visitLabel(loop);
    mv.visitVarInsn(ALOAD, arity + 2);
    if (EProc.TAIL_MARKER == null) {
        mv.visitJumpInsn(IFNONNULL, done);
    } else {
        mv.visitFieldInsn(GETSTATIC, EPROC_TYPE.getInternalName(), "TAIL_MARKER", EOBJECT_TYPE.getDescriptor());
        mv.visitJumpInsn(IF_ACMPNE, done);
    }

    // load proc
    mv.visitVarInsn(ALOAD, 1);
    mv.visitFieldInsn(GETFIELD, EPROC_TYPE.getInternalName(), "tail", EFUN_TYPE.getDescriptor());
    mv.visitVarInsn(ALOAD, 1);

    mv.visitMethodInsn(INVOKEVIRTUAL, EFUN_TYPE.getInternalName(), "go", GO_DESC);
    mv.visitVarInsn(ASTORE, arity + 2);

    mv.visitJumpInsn(GOTO, loop);

    mv.visitLabel(done);
    mv.visitVarInsn(ALOAD, arity + 2);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(arity + 2, arity + 2);
    mv.visitEnd();
}

---

From source file:erjang.ETuple.java

License:Apache License

private static void create_tuple_nth(int n_cells, ClassAdapter cw, String this_class_name) {
    MethodVisitor mv;//from   w w  w  .  ja  v  a  2s.  c om
    mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "elm", "(I)" + ETERM_TYPE.getDescriptor(), null, null);
    mv.visitCode();

    Label dflt = new Label();
    Label[] labels = new Label[n_cells];
    for (int i = 0; i < n_cells; i++) {
        labels[i] = new Label();
    }

    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitTableSwitchInsn(1, n_cells, dflt, labels);

    for (int zbase = 0; zbase < n_cells; zbase++) {

        mv.visitLabel(labels[zbase]);

        mv.visitVarInsn(Opcodes.ALOAD, 0); // load this
        String field = "elem" + (zbase + 1);

        mv.visitFieldInsn(Opcodes.GETFIELD, this_class_name, field, ETERM_TYPE.getDescriptor());
        mv.visitInsn(Opcodes.ARETURN);
    }

    mv.visitLabel(dflt);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, ETUPLE_NAME, "bad_nth", "(I)" + ETERM_TYPE.getDescriptor());
    mv.visitInsn(Opcodes.ARETURN); // make compiler happy

    mv.visitMaxs(3, 2);
    mv.visitEnd();
}

---

From source file:erjang.ETuple.java

License:Apache License

private static void create_tuple_set(int n_cells, ClassAdapter cw, String this_class_name) {
    MethodVisitor mv;//from   ww w . j  a  v  a  2 s .c o  m
    mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "set", "(I" + ETERM_TYPE.getDescriptor() + ")V", null, null);
    mv.visitCode();

    Label dflt = new Label();
    Label[] labels = new Label[n_cells];
    for (int i = 0; i < n_cells; i++) {
        labels[i] = new Label();
    }

    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitTableSwitchInsn(1, n_cells, dflt, labels);

    for (int zbase = 0; zbase < n_cells; zbase++) {

        mv.visitLabel(labels[zbase]);

        mv.visitVarInsn(Opcodes.ALOAD, 0); // load this
        mv.visitVarInsn(Opcodes.ALOAD, 2); // load term

        String field = "elem" + (zbase + 1);

        mv.visitFieldInsn(Opcodes.PUTFIELD, this_class_name, field, ETERM_TYPE.getDescriptor());
        mv.visitInsn(Opcodes.RETURN);
    }

    mv.visitLabel(dflt);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, ETUPLE_NAME, "bad_nth", "(I)" + ETERM_TYPE.getDescriptor());
    mv.visitInsn(Opcodes.POP);
    mv.visitInsn(Opcodes.RETURN); // make compiler happy

    mv.visitMaxs(3, 3);
    mv.visitEnd();
}

---

From source file:erjang.ETuple.java

License:Apache License

private static void create_cast(ClassAdapter cw, int n) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "cast",
            "(L" + ETUPLE_NAME + ";)L" + ETUPLE_NAME + n + ";", null, null);
    mv.visitCode();//from  w  w  w .  j  av a  2  s  . c  o m

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, ETUPLE_NAME, "arity", "()I");

    if (n <= 5) {
        mv.visitInsn(Opcodes.ICONST_0 + n);
    } else {
        mv.visitLdcInsn(new Integer(n));
    }

    Label fail = new Label();

    mv.visitJumpInsn(Opcodes.IF_ICMPNE, fail);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(Opcodes.CHECKCAST, ETUPLE_NAME + n);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(fail);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

---

From source file:erjang.ETuple.java

License:Apache License

private static void create_cast2(ClassAdapter cw, int n) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "cast",
            "(L" + Type.getInternalName(EObject.class) + ";)L" + ETUPLE_NAME + n + ";", null, null);
    mv.visitCode();/*from ww w .j  a v  a2 s.c om*/

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitInsn(Opcodes.DUP);
    mv.visitTypeInsn(Opcodes.INSTANCEOF, ETUPLE_NAME + n);

    Label fail = new Label();

    mv.visitJumpInsn(Opcodes.IFEQ, fail);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(Opcodes.CHECKCAST, ETUPLE_NAME + n);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(fail);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

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From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeGenerationGoloIrVisitor.java

License:Apache License

@Override
public void visitBlock(Block block) {
    ReferenceTable referenceTable = block.getReferenceTable();
    context.referenceTableStack.push(referenceTable);
    Label blockStart = new Label();
    Label blockEnd = new Label();
    methodVisitor.visitLabel(blockStart);
    for (GoloStatement statement : block.getStatements()) {
        visitLine(statement, methodVisitor);
        statement.accept(this);
        insertMissingPop(statement);//from w  w w  . j  ava2  s  .c  o  m
    }
    methodVisitor.visitLabel(blockEnd);
    for (LocalReference localReference : referenceTable.ownedReferences()) {
        if (localReference.isModuleState()) {
            continue;
        }
        methodVisitor.visitLocalVariable(localReference.getName(), TOBJECT, null, blockStart, blockEnd,
                localReference.getIndex());
    }
    context.referenceTableStack.pop();
}

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