Examples with Label org.springframework.asm.Label used on opensource projects

Example 6 with Label

use of org.springframework.asm.Label in project spring-framework by spring-projects.

the class OperatorNot method generateCode.

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
    this.children[0].generateCode(mv, cf);
    cf.unboxBooleanIfNecessary(mv);
    Label elseTarget = new Label();
    Label endOfIf = new Label();
    mv.visitJumpInsn(IFNE, elseTarget);
    // TRUE
    mv.visitInsn(ICONST_1);
    mv.visitJumpInsn(GOTO, endOfIf);
    mv.visitLabel(elseTarget);
    // FALSE
    mv.visitInsn(ICONST_0);
    mv.visitLabel(endOfIf);
    cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 7 with Label

use of org.springframework.asm.Label in project spring-framework by spring-projects.

the class Ternary method generateCode.

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
    // May reach here without it computed if all elements are literals
    computeExitTypeDescriptor();
    cf.enterCompilationScope();
    this.children[0].generateCode(mv, cf);
    String lastDesc = cf.lastDescriptor();
    Assert.state(lastDesc != null, "No last descriptor");
    if (!CodeFlow.isPrimitive(lastDesc)) {
        CodeFlow.insertUnboxInsns(mv, 'Z', lastDesc);
    }
    cf.exitCompilationScope();
    Label elseTarget = new Label();
    Label endOfIf = new Label();
    mv.visitJumpInsn(IFEQ, elseTarget);
    cf.enterCompilationScope();
    this.children[1].generateCode(mv, cf);
    if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
        lastDesc = cf.lastDescriptor();
        Assert.state(lastDesc != null, "No last descriptor");
        CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
    }
    cf.exitCompilationScope();
    mv.visitJumpInsn(GOTO, endOfIf);
    mv.visitLabel(elseTarget);
    cf.enterCompilationScope();
    this.children[2].generateCode(mv, cf);
    if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
        lastDesc = cf.lastDescriptor();
        Assert.state(lastDesc != null, "No last descriptor");
        CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
    }
    cf.exitCompilationScope();
    mv.visitLabel(endOfIf);
    cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 8 with Label

use of org.springframework.asm.Label in project spring-framework by spring-projects.

the class Elvis method generateCode.

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
    // exit type descriptor can be null if both components are literal expressions
    computeExitTypeDescriptor();
    cf.enterCompilationScope();
    this.children[0].generateCode(mv, cf);
    String lastDesc = cf.lastDescriptor();
    Assert.state(lastDesc != null, "No last descriptor");
    CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
    cf.exitCompilationScope();
    Label elseTarget = new Label();
    Label endOfIf = new Label();
    mv.visitInsn(DUP);
    mv.visitJumpInsn(IFNULL, elseTarget);
    // Also check if empty string, as per the code in the interpreted version
    mv.visitInsn(DUP);
    mv.visitLdcInsn("");
    mv.visitInsn(SWAP);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
    // if not empty, drop through to elseTarget
    mv.visitJumpInsn(IFEQ, endOfIf);
    mv.visitLabel(elseTarget);
    mv.visitInsn(POP);
    cf.enterCompilationScope();
    this.children[1].generateCode(mv, cf);
    if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
        lastDesc = cf.lastDescriptor();
        Assert.state(lastDesc != null, "No last descriptor");
        CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
    }
    cf.exitCompilationScope();
    mv.visitLabel(endOfIf);
    cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 9 with Label

use of org.springframework.asm.Label in project spring-framework by spring-projects.

the class MethodReference method generateCode.

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
    CachedMethodExecutor executorToCheck = this.cachedExecutor;
    if (executorToCheck == null || !(executorToCheck.get() instanceof ReflectiveMethodExecutor)) {
        throw new IllegalStateException("No applicable cached executor found: " + executorToCheck);
    }
    ReflectiveMethodExecutor methodExecutor = (ReflectiveMethodExecutor) executorToCheck.get();
    Method method = methodExecutor.getMethod();
    boolean isStaticMethod = Modifier.isStatic(method.getModifiers());
    String descriptor = cf.lastDescriptor();
    Label skipIfNull = null;
    if (descriptor == null && !isStaticMethod) {
        // Nothing on the stack but something is needed
        cf.loadTarget(mv);
    }
    if ((descriptor != null || !isStaticMethod) && this.nullSafe) {
        mv.visitInsn(DUP);
        skipIfNull = new Label();
        Label continueLabel = new Label();
        mv.visitJumpInsn(IFNONNULL, continueLabel);
        CodeFlow.insertCheckCast(mv, this.exitTypeDescriptor);
        mv.visitJumpInsn(GOTO, skipIfNull);
        mv.visitLabel(continueLabel);
    }
    if (descriptor != null && isStaticMethod) {
        // Something on the stack when nothing is needed
        mv.visitInsn(POP);
    }
    if (CodeFlow.isPrimitive(descriptor)) {
        CodeFlow.insertBoxIfNecessary(mv, descriptor.charAt(0));
    }
    String classDesc;
    if (Modifier.isPublic(method.getDeclaringClass().getModifiers())) {
        classDesc = method.getDeclaringClass().getName().replace('.', '/');
    } else {
        Class<?> publicDeclaringClass = methodExecutor.getPublicDeclaringClass();
        Assert.state(publicDeclaringClass != null, "No public declaring class");
        classDesc = publicDeclaringClass.getName().replace('.', '/');
    }
    if (!isStaticMethod && (descriptor == null || !descriptor.substring(1).equals(classDesc))) {
        CodeFlow.insertCheckCast(mv, "L" + classDesc);
    }
    generateCodeForArguments(mv, cf, method, this.children);
    mv.visitMethodInsn((isStaticMethod ? INVOKESTATIC : (method.isDefault() ? INVOKEINTERFACE : INVOKEVIRTUAL)), classDesc, method.getName(), CodeFlow.createSignatureDescriptor(method), method.getDeclaringClass().isInterface());
    cf.pushDescriptor(this.exitTypeDescriptor);
    if (this.originalPrimitiveExitTypeDescriptor != null) {
        // The output of the accessor will be a primitive but from the block above it might be null,
        // so to have a 'common stack' element at skipIfNull target we need to box the primitive
        CodeFlow.insertBoxIfNecessary(mv, this.originalPrimitiveExitTypeDescriptor);
    }
    if (skipIfNull != null) {
        mv.visitLabel(skipIfNull);
    }
}

Example 10 with Label

use of org.springframework.asm.Label in project spring-framework by spring-projects.

the class OpNE method generateCode.

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
    cf.loadEvaluationContext(mv);
    String leftDesc = getLeftOperand().exitTypeDescriptor;
    String rightDesc = getRightOperand().exitTypeDescriptor;
    boolean leftPrim = CodeFlow.isPrimitive(leftDesc);
    boolean rightPrim = CodeFlow.isPrimitive(rightDesc);
    cf.enterCompilationScope();
    getLeftOperand().generateCode(mv, cf);
    cf.exitCompilationScope();
    if (leftPrim) {
        CodeFlow.insertBoxIfNecessary(mv, leftDesc.charAt(0));
    }
    cf.enterCompilationScope();
    getRightOperand().generateCode(mv, cf);
    cf.exitCompilationScope();
    if (rightPrim) {
        CodeFlow.insertBoxIfNecessary(mv, rightDesc.charAt(0));
    }
    String operatorClassName = Operator.class.getName().replace('.', '/');
    String evaluationContextClassName = EvaluationContext.class.getName().replace('.', '/');
    mv.visitMethodInsn(INVOKESTATIC, operatorClassName, "equalityCheck", "(L" + evaluationContextClassName + ";Ljava/lang/Object;Ljava/lang/Object;)Z", false);
    // Invert the boolean
    Label notZero = new Label();
    Label end = new Label();
    mv.visitJumpInsn(IFNE, notZero);
    mv.visitInsn(ICONST_1);
    mv.visitJumpInsn(GOTO, end);
    mv.visitLabel(notZero);
    mv.visitInsn(ICONST_0);
    mv.visitLabel(end);
    cf.pushDescriptor("Z");
}