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.bytecode.types.gambit.IterateBuilderAdapter.java

@Override
public void next(BytecodeExpression test) {
    final BytecodeExpression testExpr = test;
    final TypeWidget type = testExpr.getType();
    body.add(new BytecodeSequence() {
        @Override/*from w  w w  . ja va2 s.  c om*/
        public void generate(CodeEmitter code) {
            code.exec(testExpr);
            Label isFalse = new Label();
            type.getComparisionAdapter().coerceBoolean(code, next, isFalse, isFalse);
            MethodVisitor mv = code.getMethodVisitor();
            mv.visitLabel(isFalse);
        }
    });

}

---

From source file:com.yahoo.yqlplus.engine.internal.bytecode.types.gambit.LoopAdapter.java

@Override
public void abort(final BytecodeExpression test) {
    final TypeWidget type = test.getType();
    body.add(new BytecodeSequence() {
        @Override//from   www  .j a v  a  2s  . c o m
        public void generate(CodeEmitter code) {
            code.exec(test);
            Label isTrue = new Label();
            Label isFalse = new Label();
            type.getComparisionAdapter().coerceBoolean(code, isTrue, isFalse, isFalse);
            MethodVisitor mv = code.getMethodVisitor();
            mv.visitLabel(isTrue);
            code.exec(result);
            mv.visitJumpInsn(Opcodes.GOTO, body.getEnd());
            mv.visitLabel(isFalse);
        }
    });
}

---

From source file:com.yahoo.yqlplus.engine.internal.bytecode.types.gambit.LoopAdapter.java

@Override
public void next(final BytecodeExpression test) {
    final TypeWidget type = test.getType();
    body.add(new BytecodeSequence() {
        @Override//from   ww w.j a va  2 s . c  om
        public void generate(CodeEmitter code) {
            code.exec(test);
            Label isTrue = new Label();
            Label isFalse = new Label();
            type.getComparisionAdapter().coerceBoolean(code, isTrue, isFalse, isFalse);
            MethodVisitor mv = code.getMethodVisitor();
            mv.visitLabel(isTrue);
            code.exec(result);
            mv.visitJumpInsn(Opcodes.GOTO, next);
            mv.visitLabel(isFalse);
        }
    });

}

---

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

@Override
public void generate(CodeEmitter code) {
    code.exec(new CompareExpression(loc, leftExpr, rightExpr));
    MethodVisitor mv = code.getMethodVisitor();
    Label isTrue = new Label();
    Label done = new Label();
    switch (booleanComparison) {
    case LT:/*from ww  w  .j  a  v  a  2  s. com*/
        mv.visitJumpInsn(Opcodes.IFLT, isTrue);
        break;
    case LTEQ:
        mv.visitJumpInsn(Opcodes.IFLE, isTrue);
        break;
    case GT:
        mv.visitJumpInsn(Opcodes.IFGT, isTrue);
        break;
    case GTEQ:
        mv.visitJumpInsn(Opcodes.IFGE, isTrue);
        break;
    }
    code.emitBooleanConstant(false);
    mv.visitJumpInsn(Opcodes.GOTO, done);
    mv.visitLabel(isTrue);
    code.emitBooleanConstant(true);
    mv.visitLabel(done);
}

---

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

@Override
public void generate(CodeEmitter code) {
    MethodVisitor mv = code.getMethodVisitor();
    Label isNull = new Label();
    TypeWidget mathType = getType().unboxed();

    if (!mathType.isPrimitive() || op == ArithmeticOperation.POW) {
        mv.visitFieldInsn(Opcodes.GETSTATIC, Type.getInternalName(Maths.class), "INSTANCE",
                Type.getDescriptor(Maths.class));
        mv.visitFieldInsn(Opcodes.GETSTATIC, Type.getInternalName(ArithmeticOperation.class), op.name(),
                Type.getDescriptor(ArithmeticOperation.class));
    }/*from   w  w  w  .  jav a 2s  .c om*/

    CodeEmitter.Unification out = code.unifyAs(mathType, leftExpr, rightExpr, isNull, isNull, isNull);
    // now we have both sides unified as (if possible) a primitive type

    // compute the result
    if (mathType.isPrimitive()) {
        switch (op) {
        case ADD:
            mv.visitInsn(mathType.getJVMType().getOpcode(Opcodes.IADD));
            break;
        case SUB:
            mv.visitInsn(mathType.getJVMType().getOpcode(Opcodes.ISUB));
            break;
        case MULT:
            mv.visitInsn(mathType.getJVMType().getOpcode(Opcodes.IMUL));
            break;
        case DIV:
            mv.visitInsn(mathType.getJVMType().getOpcode(Opcodes.IDIV));
            break;
        case MOD:
            mv.visitInsn(mathType.getJVMType().getOpcode(Opcodes.IREM));
            break;
        case POW:
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Maths.class), "binaryMath",
                    Type.getMethodDescriptor(mathType.getJVMType(), Type.getType(ArithmeticOperation.class),
                            mathType.getJVMType(), mathType.getJVMType()),
                    false);
            break;
        default:
            throw new ProgramCompileException(loc, "Unknown BinaryMath operation: " + op);

        }
    } else if (mathType.getValueCoreType() == YQLCoreType.ANY) {
        String desc = Type.getMethodDescriptor(getType().getJVMType(), Type.getType(Maths.class),
                Type.getType(ArithmeticOperation.class), leftExpr.getType().boxed().getJVMType(),
                rightExpr.getType().boxed().getJVMType());
        mv.visitInvokeDynamicInsn("dyn:callMethod:binaryMath", desc, Dynamic.H_DYNALIB_BOOTSTRAP);
    } else {
        throw new ProgramCompileException(loc, "Math operation %s is not defined for type %s", op,
                mathType.getJVMType());
    }

    if (!getType().isPrimitive() && mathType.isPrimitive()) {
        code.box(mathType);
    }

    if (out.nullPossible) {
        Label done = new Label();
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(isNull);
        if (!mathType.isPrimitive() || op == ArithmeticOperation.POW) {
            mv.visitInsn(Opcodes.POP2);
        }
        mv.visitInsn(Opcodes.ACONST_NULL);
        mv.visitLabel(done);
    }
}

---

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

@Override
public void generate(CodeEmitter code) {
    MethodVisitor mv = code.getMethodVisitor();
    Label isNull = new Label();
    TypeWidget mathType = getType().unboxed();

    if (!mathType.isPrimitive()) {
        mv.visitFieldInsn(Opcodes.GETSTATIC, Type.getInternalName(Maths.class), "INSTANCE",
                Type.getDescriptor(Maths.class));
    }/*from w  w w  . j av a  2  s . c o  m*/

    boolean maybeNull = code.cast(mathType, leftExpr.getType(), isNull);
    // compute the result
    if (mathType.isPrimitive()) {
        mv.visitInsn(mathType.getJVMType().getOpcode(Opcodes.INEG));
    } else if (mathType.getValueCoreType() == YQLCoreType.ANY) {
        String desc = Type.getMethodDescriptor(getType().getJVMType(), Type.getType(Maths.class),
                leftExpr.getType().getJVMType());
        mv.visitInvokeDynamicInsn("dyn:callMethod:negate", desc, Dynamic.H_DYNALIB_BOOTSTRAP);
    } else {
        throw new ProgramCompileException(loc, "Math operation NEGATE is not defined for type %s",
                mathType.getJVMType());
    }

    if (!getType().isPrimitive() && mathType.isPrimitive()) {
        code.box(mathType);
    }

    if (maybeNull) {
        Label done = new Label();
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(isNull);
        mv.visitInsn(Opcodes.ACONST_NULL);
        mv.visitLabel(done);
    }
}

---

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

public Unification unifyAs(TypeWidget typeWidget, BytecodeExpression left, BytecodeExpression right,
        Label leftNull, Label rightNull, Label bothNull) {
    left.generate(this);
    boolean distinct = (leftNull != bothNull) && right.getType().isNullable();
    Label leftIsNull = distinct ? new Label() : leftNull;
    boolean nullpossible = cast(typeWidget, left.getType(), leftIsNull);
    if (nullpossible && distinct) {
        Label skip = new Label();
        methodVisitor.visitJumpInsn(Opcodes.GOTO, skip);
        methodVisitor.visitLabel(leftIsNull);
        right.generate(this);
        methodVisitor.visitJumpInsn(Opcodes.IFNULL, bothNull);
        methodVisitor.visitJumpInsn(Opcodes.GOTO, leftNull);
        methodVisitor.visitLabel(skip);//from   w  w w .j  a v a2 s .c om
    }
    Label pop = new Label();
    right.generate(this);
    if (cast(typeWidget, right.getType(), pop)) {
        Label done = new Label();
        nullpossible = true;
        methodVisitor.visitJumpInsn(Opcodes.GOTO, done);
        methodVisitor.visitLabel(pop);
        // pop the left-value
        pop(typeWidget);
        methodVisitor.visitJumpInsn(Opcodes.GOTO, rightNull);
        methodVisitor.visitLabel(done);
    }
    return new Unification(typeWidget, nullpossible);
}

---

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

public BinaryCoercion binaryCoercion(BytecodeExpression left, Class<?> leftClazz, BytecodeExpression right,
        Class<?> rightClazz, Label leftNull, Label rightNull, Label bothNull) {
    TypeWidget leftTarget = adapt(leftClazz);
    TypeWidget rightTarget = adapt(rightClazz);
    left.generate(this);
    boolean distinct = (leftNull != bothNull) && right.getType().isNullable();
    Label leftIsNull = distinct ? new Label() : leftNull;
    boolean leftMaybeNull = cast(leftTarget, left.getType(), leftIsNull);
    if (leftMaybeNull && distinct) {
        Label skip = new Label();
        methodVisitor.visitJumpInsn(Opcodes.GOTO, skip);
        methodVisitor.visitLabel(leftIsNull);
        right.generate(this);
        methodVisitor.visitJumpInsn(Opcodes.IFNULL, bothNull);
        methodVisitor.visitJumpInsn(Opcodes.GOTO, leftNull);
        methodVisitor.visitLabel(skip);/*w ww.  j av a 2  s. c om*/
    }
    Label pop = new Label();
    right.generate(this);
    boolean rightMaybeNull = false;
    if (cast(rightTarget, right.getType(), pop)) {
        Label done = new Label();
        rightMaybeNull = true;
        methodVisitor.visitJumpInsn(Opcodes.GOTO, done);
        methodVisitor.visitLabel(pop);
        // pop the left-value
        pop(leftTarget);
        methodVisitor.visitJumpInsn(Opcodes.GOTO, rightNull);
        methodVisitor.visitLabel(done);
    }
    return new BinaryCoercion(leftMaybeNull, rightMaybeNull);
}

---

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

public boolean nullTest(TypeWidget typeWidget, Label isNull) {
    if (typeWidget.isNullable()) {
        Label done = new Label();
        dup(typeWidget);//w  w  w .j a v a2  s  .com
        getMethodVisitor().visitJumpInsn(Opcodes.IFNONNULL, done);
        pop(typeWidget);
        getMethodVisitor().visitJumpInsn(Opcodes.GOTO, isNull);
        getMethodVisitor().visitLabel(done);
        return true;
    }
    return false;
}

---

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

public boolean nullTestLeaveNull(TypeWidget typeWidget, Label isNull) {
    if (typeWidget.isNullable()) {
        Label done = new Label();
        dup(typeWidget);//  ww  w.j av  a  2  s .c o m
        getMethodVisitor().visitJumpInsn(Opcodes.IFNONNULL, done);
        getMethodVisitor().visitJumpInsn(Opcodes.GOTO, isNull);
        getMethodVisitor().visitLabel(done);
        return true;
    }
    return false;
}

---

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