Examples with JavaClass org.apache.bcel.classfile.JavaClass used on opensource projects

Example 96 with JavaClass

use of org.apache.bcel.classfile.JavaClass in project fb-contrib by mebigfatguy.

the class SillynessPotPourri method equalsSilliness.

private void equalsSilliness(String className) {
    try {
        JavaClass cls = Repository.lookupClass(className);
        if (cls.isEnum()) {
            bugReporter.reportBug(new BugInstance(this, BugType.SPP_EQUALS_ON_ENUM.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this));
        } else {
            if (stack.getStackDepth() >= 2) {
                OpcodeStack.Item item = stack.getStackItem(1);
                cls = item.getJavaClass();
                if (cls != null) {
                    String clsName = cls.getClassName();
                    if (oddMissingEqualsClasses.contains(clsName)) {
                        bugReporter.reportBug(new BugInstance(this, BugType.SPP_EQUALS_ON_STRING_BUILDER.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this));
                    }
                }
            }
        }
    } catch (ClassNotFoundException cnfe) {
        bugReporter.reportMissingClass(cnfe);
    }
}

Example 97 with JavaClass

use of org.apache.bcel.classfile.JavaClass in project fb-contrib by mebigfatguy.

the class SluggishGui method visitClassContext.

/**
 * overrides the visitor to reset look for gui interfaces
 *
 * @param classContext
 *            the context object for the currently parsed class
 */
@Override
public void visitClassContext(ClassContext classContext) {
    try {
        guiInterfaces = new HashSet<>();
        JavaClass cls = classContext.getJavaClass();
        JavaClass[] infs = cls.getAllInterfaces();
        for (JavaClass inf : infs) {
            String name = inf.getClassName();
            if ((name.startsWith("java.awt.") || name.startsWith("javax.swing.")) && name.endsWith("Listener")) {
                guiInterfaces.add(inf);
            }
        }
        if (!guiInterfaces.isEmpty()) {
            listenerCode = new LinkedHashMap<>();
            expensiveThisCalls = new HashSet<>();
            super.visitClassContext(classContext);
        }
    } catch (ClassNotFoundException cnfe) {
        bugReporter.reportMissingClass(cnfe);
    } finally {
        guiInterfaces = null;
        listenerCode = null;
        expensiveThisCalls = null;
    }
}

Example 98 with JavaClass

use of org.apache.bcel.classfile.JavaClass in project fb-contrib by mebigfatguy.

the class StackedTryBlocks method sawOpcode.

/**
 * overrides the visitor to document what catch blocks do with regard to rethrowing the exceptions, and if the message is a static message
 *
 * @param seen
 *            the currently parsed opcode
 */
@Override
public void sawOpcode(int seen) {
    String message = null;
    try {
        stack.precomputation(this);
        if ((seen == Const.TABLESWITCH) || (seen == Const.LOOKUPSWITCH)) {
            int pc = getPC();
            for (int offset : getSwitchOffsets()) {
                transitionPoints.set(pc + offset);
            }
            transitionPoints.set(pc + getDefaultSwitchOffset());
        } else if (isBranch(seen) && (getBranchOffset() < 0)) {
            // throw out try blocks in loops, this could cause false
            // negatives
            // with two try/catches in one loop, but more unlikely
            Iterator<TryBlock> it = blocks.iterator();
            int target = getBranchTarget();
            while (it.hasNext()) {
                TryBlock block = it.next();
                if (block.getStartPC() >= target) {
                    it.remove();
                }
            }
        }
        int pc = getPC();
        TryBlock block = findBlockWithStart(pc);
        if (block != null) {
            inBlocks.add(block);
            block.setState(TryBlock.State.IN_TRY);
        }
        if (inBlocks.isEmpty()) {
            return;
        }
        TryBlock innerBlock = inBlocks.get(inBlocks.size() - 1);
        int nextPC = getNextPC();
        if (innerBlock.atHandlerPC(nextPC)) {
            if ((seen == Const.GOTO) || (seen == Const.GOTO_W)) {
                innerBlock.setEndHandlerPC(getBranchTarget());
            } else {
                inBlocks.remove(innerBlock);
                blocks.remove(innerBlock);
            }
        } else if (innerBlock.atHandlerPC(pc)) {
            innerBlock.setState(TryBlock.State.IN_CATCH);
        } else if (innerBlock.atEndHandlerPC(pc)) {
            inBlocks.remove(inBlocks.size() - 1);
            innerBlock.setState(TryBlock.State.AFTER);
        }
        if (transitionPoints.get(nextPC)) {
            if (innerBlock.inCatch() && (innerBlock.getEndHandlerPC() > nextPC)) {
                innerBlock.setEndHandlerPC(nextPC);
            }
        }
        if (innerBlock.inCatch()) {
            if (((seen >= Const.IFEQ) && ((seen <= Const.RET))) || (seen == Const.GOTO_W) || OpcodeUtils.isReturn(seen)) {
                blocks.remove(innerBlock);
                inBlocks.remove(inBlocks.size() - 1);
            } else if (seen == Const.ATHROW) {
                if (stack.getStackDepth() > 0) {
                    OpcodeStack.Item item = stack.getStackItem(0);
                    XMethod xm = item.getReturnValueOf();
                    if (xm != null) {
                        innerBlock.setThrowSignature(xm.getSignature());
                    }
                    innerBlock.setExceptionSignature(item.getSignature());
                    innerBlock.setMessage((String) item.getUserValue());
                } else {
                    inBlocks.remove(inBlocks.size() - 1);
                    innerBlock.setState(TryBlock.State.AFTER);
                }
            } else if ((seen == Const.INVOKESPECIAL) && Values.CONSTRUCTOR.equals(getNameConstantOperand())) {
                String cls = getClassConstantOperand();
                JavaClass exCls = Repository.lookupClass(cls);
                if (exCls.instanceOf(THROWABLE_CLASS)) {
                    String signature = getSigConstantOperand();
                    List<String> types = SignatureUtils.getParameterSignatures(signature);
                    if (!types.isEmpty()) {
                        if (Values.SIG_JAVA_LANG_STRING.equals(types.get(0)) && (stack.getStackDepth() >= types.size())) {
                            OpcodeStack.Item item = stack.getStackItem(types.size() - 1);
                            message = (String) item.getConstant();
                            if (message == null) {
                                message = "____UNKNOWN____" + System.identityHashCode(item);
                            }
                        }
                    } else {
                        message = "";
                    }
                }
            }
        }
    } catch (ClassNotFoundException cnfe) {
        bugReporter.reportMissingClass(cnfe);
    } finally {
        stack.sawOpcode(this, seen);
        if ((message != null) && (stack.getStackDepth() > 0)) {
            OpcodeStack.Item item = stack.getStackItem(0);
            item.setUserValue(message);
        }
    }
}

Example 99 with JavaClass

use of org.apache.bcel.classfile.JavaClass in project fb-contrib by mebigfatguy.

the class NonRecycleableTaglibs method visitClassContext.

/**
 * implements the visitor to look for classes that extend the TagSupport or BodyTagSupport class
 *
 * @param classContext
 *            the context object for the currently parsed class
 */
@Override
public void visitClassContext(ClassContext classContext) {
    try {
        JavaClass cls = classContext.getJavaClass();
        JavaClass[] superClasses = cls.getSuperClasses();
        for (JavaClass superCls : superClasses) {
            if (tagClasses.contains(superCls.getClassName())) {
                attributes = getAttributes(cls);
                if (!attributes.isEmpty()) {
                    methodWrites = new HashMap<>();
                    fieldAnnotations = new HashMap<>();
                    super.visitClassContext(classContext);
                    reportBugs();
                }
                break;
            }
        }
    } catch (ClassNotFoundException cnfe) {
        bugReporter.reportMissingClass(cnfe);
    } finally {
        attributes = null;
        methodWrites = null;
        fieldAnnotations = null;
    }
}

Example 100 with JavaClass

use of org.apache.bcel.classfile.JavaClass in project fb-contrib by mebigfatguy.

the class NonSymmetricEquals method sawOpcode.

/**
 * implements the visitor to look for checkcasts of the parameter to other types, and enter instances in a map for further processing in doReport.
 *
 * @param seen
 *            the opcode of the currently parsed instruction
 */
@Override
public void sawOpcode(int seen) {
    try {
        stack.precomputation(this);
        if ((seen == Const.CHECKCAST) && (stack.getStackDepth() > 0)) {
            OpcodeStack.Item item = stack.getStackItem(0);
            if (item.getRegisterNumber() == 1) {
                String thisCls = getClassName();
                String equalsCls = getClassConstantOperand();
                if (!thisCls.equals(equalsCls)) {
                    JavaClass thisJavaClass = getClassContext().getJavaClass();
                    JavaClass equalsJavaClass = Repository.lookupClass(equalsCls);
                    boolean inheritance = thisJavaClass.instanceOf(equalsJavaClass) || equalsJavaClass.instanceOf(thisJavaClass);
                    BugInstance bug = new BugInstance(this, BugType.NSE_NON_SYMMETRIC_EQUALS.name(), inheritance ? LOW_PRIORITY : NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this).addString(equalsCls);
                    Map<String, BugInstance> bugs = possibleBugs.get(thisCls);
                    if (bugs == null) {
                        bugs = new HashMap<>();
                        possibleBugs.put(thisCls, bugs);
                    }
                    bugs.put(equalsCls, bug);
                }
            }
        }
    } catch (ClassNotFoundException cnfe) {
        bugReporter.reportMissingClass(cnfe);
    } finally {
        stack.sawOpcode(this, seen);
    }
}