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:com.yahoo.yqlplus.engine.internal.compiler.CodeEmitter.java

public void emitInstanceCheck(TypeWidget targetType, Class<?> clazz, Label isNotInstance) {
    Label is = new Label();
    Label not = new Label();
    nullTest(targetType, isNotInstance);
    emitInstanceOf(targetType, clazz, not);
    getMethodVisitor().visitJumpInsn(Opcodes.GOTO, is);
    getMethodVisitor().visitLabel(not);/*  www.  j  a  v  a  2s .  co  m*/
    pop(targetType);
    getMethodVisitor().visitJumpInsn(Opcodes.GOTO, isNotInstance);
    getMethodVisitor().visitLabel(is);
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.CodeEmitter.java

public void emitStringSwitch(Map<String, Label> labels, Label defaultCase, boolean caseInsensitive) {
    MethodVisitor mv = getMethodVisitor();
    if (caseInsensitive) {
        mv.visitFieldInsn(GETSTATIC, "java/util/Locale", "ENGLISH", "Ljava/util/Locale;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "toUpperCase",
                "(Ljava/util/Locale;)Ljava/lang/String;", false);
    }// w  ww.j  a  v a  2  s.c o m
    mv.visitInsn(DUP);
    AssignableValue tmp = allocate(String.class);
    tmp.write(BaseTypeAdapter.STRING).generate(this);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "hashCode", "()I", false);
    Multimap<Integer, SwitchLabel> keys = ArrayListMultimap.create();
    for (Map.Entry<String, Label> e : labels.entrySet()) {
        String name = e.getKey();
        if (caseInsensitive) {
            name = name.toUpperCase(Locale.ENGLISH);
        }
        keys.put(name.hashCode(), new SwitchLabel(name, e.getValue()));
    }
    List<Integer> codes = Lists.newArrayList(keys.keySet());
    Collections.sort(codes);
    int[] k = new int[codes.size()];
    Label[] kl = new Label[codes.size()];
    for (int i = 0; i < k.length; ++i) {
        k[i] = codes.get(i);
        kl[i] = new Label();
    }
    mv.visitLookupSwitchInsn(defaultCase, k, kl);
    for (int i = 0; i < k.length; ++i) {
        mv.visitLabel(kl[i]);
        for (SwitchLabel switchLabel : keys.get(k[i])) {
            mv.visitLdcInsn(switchLabel.name);
            tmp.read().generate(this);
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
            mv.visitJumpInsn(IFNE, switchLabel.label);
        }
        mv.visitJumpInsn(GOTO, defaultCase);
    }
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.CompareExpression.java

@Override
public void generate(CodeEmitter code) {
    // a bit of a hack; should not need to go to dynamic invocation for this unless one arg is ANY
    Label done = new Label();
    MethodVisitor mv = code.getMethodVisitor();
    Label leftNull = new Label();
    Label rightNull = new Label();
    Label bothNull = new Label();
    CodeEmitter.Unification unified = code.unifiedEmit(leftExpr, rightExpr, leftNull, rightNull, bothNull);
    if (unified.type.isPrimitive()) {
        emitPrimitiveCompare(code, unified.type);
    } else {/*  w w w  .j  a  v  a 2 s .  c  o m*/
        // TODO: statically determine if the unified type is Comparable -- for now treat them all like "any"
        CodeEmitter scope = code.createScope();
        MethodVisitor mv2 = scope.getMethodVisitor();
        AssignableValue right = scope.allocate(unified.type);
        AssignableValue left = scope.allocate(unified.type);
        scope.exec(right.write(unified.type));
        scope.exec(left.write(unified.type));
        scope.exec(left.read());
        Label leftIsNotComparable = new Label();
        scope.emitInstanceCheck(unified.type, Comparable.class, leftIsNotComparable);
        scope.exec(right.read());
        mv2.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(Comparable.class), "compareTo",
                Type.getMethodDescriptor(Type.INT_TYPE, Type.getType(Object.class)), true);
        scope.gotoExitScope();
        mv2.visitLabel(leftIsNotComparable);
        scope.exec(scope.getLocal("$program").read());
        scope.exec(left.read());
        scope.emitIntConstant((loc != null) ? loc.getLineNumber() : -1);
        scope.emitIntConstant((loc != null) ? loc.getCharacterOffset() : 0);
        mv2.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(ProgramInvocation.class),
                "notComparable", Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(Object.class),
                        Type.INT_TYPE, Type.INT_TYPE),
                false);
        // this bit is not reachable, notComparable throws
        mv2.visitInsn(Opcodes.ICONST_0);
        mv2.visitJumpInsn(Opcodes.GOTO, done);
        scope.endScope();
    }
    if (unified.nullPossible) {
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(leftNull);
        mv.visitInsn(Opcodes.ICONST_M1);
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(rightNull);
        mv.visitInsn(Opcodes.ICONST_1);
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(bothNull);
        mv.visitInsn(Opcodes.ICONST_0);
    }
    mv.visitLabel(done);
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.EqualsExpression.java

@Override
public void generate(CodeEmitter code) {
    // a bit of a hack; should not need to go to dynamic invocation for this unless one arg is ANY
    MethodVisitor mv = code.getMethodVisitor();
    Label hasNull = new Label();
    CodeEmitter.Unification unified = code.unifiedEmit(leftExpr, rightExpr, hasNull);
    if (unified.type.isPrimitive()) {
        emitPrimitiveEquals(code, unified.type);
    } else {//  w w w.j  a  v a  2 s  . com
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Object.class), "equals",
                Type.getMethodDescriptor(Type.BOOLEAN_TYPE, Type.getType(Object.class)), false);
        if (negate) {
            emitNegate(mv);
        }
    }
    if (unified.nullPossible) {
        Label done = new Label();
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(hasNull);
        emitFalse(code);
        mv.visitLabel(done);
    }
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.EqualsExpression.java

private void emitComplexEquals(CodeEmitter code, int op) {
    MethodVisitor mv = code.getMethodVisitor();
    mv.visitInsn(op);//from  ww w.  j  a v a2  s.c om
    Label done = new Label();
    Label isTrue = new Label();
    mv.visitJumpInsn(Opcodes.IFEQ, isTrue);
    emitFalse(code);
    mv.visitJumpInsn(Opcodes.GOTO, done);
    mv.visitLabel(isTrue);
    emitTrue(code);
    mv.visitLabel(done);
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.EqualsExpression.java

private void emitIntEquals(CodeEmitter code) {
    Label done = new Label();
    MethodVisitor mv = code.getMethodVisitor();
    Label isTrue = new Label();
    mv.visitJumpInsn(Opcodes.IF_ICMPEQ, isTrue);
    emitFalse(code);//from w w w.  j a  va2 s .c  o m
    mv.visitJumpInsn(Opcodes.GOTO, done);
    mv.visitLabel(isTrue);
    emitTrue(code);
    mv.visitLabel(done);
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.EqualsExpression.java

private void emitNegate(MethodVisitor mv) {
    Label truth = new Label();
    Label skip = new Label();
    mv.visitJumpInsn(Opcodes.IFNE, truth);
    mv.visitInsn(Opcodes.ICONST_1);//from w  ww .  j  av a 2s  .c om
    mv.visitJumpInsn(Opcodes.GOTO, skip);
    mv.visitLabel(truth);
    mv.visitInsn(Opcodes.ICONST_0);
    mv.visitLabel(skip);
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.LocalFrame.java

public LocalFrame() {
    startFrame = new Label();
    endFrame = new Label();
    top = 0;
    parent = null;
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.LocalFrame.java

public LocalFrame(LocalFrame parent) {
    this.parent = parent;
    this.top = parent.top;
    startFrame = new Label();
    endFrame = new Label();
}

From source file:com.yahoo.yqlplus.engine.internal.compiler.MulticompareExpression.java

@Override
public void generate(CodeEmitter code) {
    CodeEmitter scope = code.createScope();
    MethodVisitor mv = scope.getMethodVisitor();
    AssignableValue var = scope.allocate(BaseTypeAdapter.INT32);
    for (BytecodeExpression expr : expressions) {
        Label areEqual = new Label();
        scope.exec(var.write(expr));
        scope.exec(var.read());
        mv.visitJumpInsn(Opcodes.IFEQ, areEqual);
        scope.exec(var.read());
        scope.gotoExitScope();/*from   w ww  . j a  v  a  2 s .c o m*/
        mv.visitLabel(areEqual);
    }
    mv.visitInsn(Opcodes.ICONST_0);
    scope.endScope();
}