Examples with FQMethod com.mebigfatguy.fbcontrib.utils.FQMethod used on opensource projects

Example 1 with FQMethod

use of com.mebigfatguy.fbcontrib.utils.FQMethod in project fb-contrib by mebigfatguy.

the class PresizeCollections method sawOpcode.

/**
 * implements the visitor to look for creation of collections that are then populated with a known number of elements usually based on another collection,
 * but the new collection is not presized.
 *
 * @param seen
 *            the opcode of the currently parsed instruction
 */
@edu.umd.cs.findbugs.annotations.SuppressFBWarnings(value = "CLI_CONSTANT_LIST_INDEX", justification = "Constrained by FindBugs API")
@Override
public void sawOpcode(int seen) {
    PSCUserValue userValue = null;
    boolean sawAlloc = false;
    try {
        stack.precomputation(this);
        switch(seen) {
            case Const.INVOKESPECIAL:
                String clsName = getClassConstantOperand();
                if (PRESIZEABLE_COLLECTIONS.contains(clsName)) {
                    String methodName = getNameConstantOperand();
                    if (Values.CONSTRUCTOR.equals(methodName)) {
                        String signature = getSigConstantOperand();
                        if (SignatureBuilder.SIG_VOID_TO_VOID.equals(signature)) {
                            userValue = new PSCUserValue(Integer.valueOf(nextAllocNumber++));
                            sawAlloc = true;
                        } else if (guavaOnPath && (stack.getStackDepth() > 0)) {
                            FQMethod fqMethod = new FQMethod(clsName, methodName, signature);
                            if (HASHMAP_SIZED_CTOR.equals(fqMethod) || HASHSET_SIZED_CTOR.equals(fqMethod)) {
                                OpcodeStack.Item itm = stack.getStackItem(0);
                                XMethod xm = itm.getReturnValueOf();
                                if ((xm != null) && "size".equals(xm.getMethodDescriptor().getName())) {
                                    bugReporter.reportBug(new BugInstance(this, BugType.PSC_SUBOPTIMAL_COLLECTION_SIZING.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this));
                                }
                            }
                        }
                    }
                }
                break;
            case Const.INVOKEINTERFACE:
                String methodName = getNameConstantOperand();
                if (ITERATOR_METHOD.equals(new QMethod(methodName, getSigConstantOperand()))) {
                    if (stack.getStackDepth() > 0) {
                        OpcodeStack.Item itm = stack.getStackItem(0);
                        userValue = isSizedSource(itm);
                    }
                } else if (ITERATOR_HASNEXT.equals(new FQMethod(getClassConstantOperand(), methodName, getSigConstantOperand()))) {
                    if (stack.getStackDepth() > 0) {
                        OpcodeStack.Item itm = stack.getStackItem(0);
                        userValue = (PSCUserValue) itm.getUserValue();
                    }
                } else if ("add".equals(methodName) || "addAll".equals(methodName)) {
                    String signature = getSigConstantOperand();
                    int numArguments = SignatureUtils.getNumParameters(signature);
                    if ((numArguments == 1) && (stack.getStackDepth() > 1)) {
                        OpcodeStack.Item item = stack.getStackItem(1);
                        PSCUserValue uv = (PSCUserValue) item.getUserValue();
                        if (uv != null) {
                            Integer allocNum = uv.getAllocationNumber();
                            if (allocNum != null) {
                                if ("addAll".equals(methodName)) {
                                    allocToAddPCs.remove(allocNum);
                                } else {
                                    List<Integer> lines = allocToAddPCs.get(allocNum);
                                    if (lines == null) {
                                        lines = new ArrayList<>();
                                        allocToAddPCs.put(allocNum, lines);
                                    }
                                    lines.add(Integer.valueOf(getPC()));
                                }
                            }
                        }
                    }
                } else if ("put".equals(methodName) || "putAll".equals(methodName)) {
                    String signature = getSigConstantOperand();
                    int numArguments = SignatureUtils.getNumParameters(signature);
                    if ((numArguments == 2) && (stack.getStackDepth() > 2)) {
                        OpcodeStack.Item item = stack.getStackItem(2);
                        PSCUserValue uv = (PSCUserValue) item.getUserValue();
                        if (uv != null) {
                            Integer allocNum = uv.getAllocationNumber();
                            if (allocNum != null) {
                                if ("putAll".equals(methodName)) {
                                    allocToAddPCs.remove(allocNum);
                                } else {
                                    List<Integer> lines = allocToAddPCs.get(allocNum);
                                    if (lines == null) {
                                        lines = new ArrayList<>();
                                        allocToAddPCs.put(allocNum, lines);
                                    }
                                    lines.add(Integer.valueOf(getPC()));
                                }
                            }
                        }
                    }
                }
                break;
            case Const.INVOKESTATIC:
                FQMethod fqm = new FQMethod(getClassConstantOperand(), getNameConstantOperand(), getSigConstantOperand());
                if (STATIC_COLLECTION_FACTORIES.contains(fqm)) {
                    userValue = new PSCUserValue(Integer.valueOf(nextAllocNumber++));
                    sawAlloc = true;
                }
                break;
            case Const.LOOKUPSWITCH:
            case Const.TABLESWITCH:
                int[] offsets = getSwitchOffsets();
                if (offsets.length >= 2) {
                    int pc = getPC();
                    int thisOffset = pc + offsets[0];
                    for (int o = 0; o < (offsets.length - 1); o++) {
                        int nextOffset = offsets[o + 1] + pc;
                        CodeRange db = new CodeRange(thisOffset, nextOffset, false);
                        optionalRanges.add(db);
                        thisOffset = nextOffset;
                    }
                }
                break;
            case Const.IFEQ:
            case Const.IFNE:
            case Const.IFLT:
            case Const.IFLE:
            case Const.IF_ICMPEQ:
            case Const.IF_ICMPNE:
            case Const.IF_ICMPLT:
            case Const.IF_ICMPGE:
            case Const.IF_ICMPGT:
            case Const.IF_ICMPLE:
            case Const.IF_ACMPEQ:
            case Const.IF_ACMPNE:
            case Const.GOTO:
            case Const.GOTO_W:
                if (getBranchOffset() < 0) {
                    if (branchBasedOnUnsizedObject(seen)) {
                        break;
                    }
                    int target = getBranchTarget();
                    Iterator<Map.Entry<Integer, List<Integer>>> it = allocToAddPCs.entrySet().iterator();
                    while (it.hasNext()) {
                        Map.Entry<Integer, List<Integer>> entry = it.next();
                        Integer allocLoc = allocLocation.get(entry.getKey());
                        if ((allocLoc != null) && (allocLoc.intValue() < target)) {
                            List<Integer> pcs = entry.getValue();
                            for (int pc : pcs) {
                                if (pc > target) {
                                    if (hasSinglePossiblySizedBranch(allocLoc.intValue(), pc)) {
                                        bugReporter.reportBug(new BugInstance(this, BugType.PSC_PRESIZE_COLLECTIONS.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this, pc));
                                        it.remove();
                                    }
                                    break;
                                }
                            }
                        }
                    }
                } else {
                    CodeRange db = new CodeRange(getPC(), getBranchTarget(), !branchBasedOnUnsizedObject(seen));
                    optionalRanges.add(db);
                }
                break;
            case Const.IFNULL:
            case Const.IFNONNULL:
            case Const.IFGE:
            case Const.IFGT:
                // null check and >, >= branches are hard to presize
                if (getBranchOffset() > 0) {
                    CodeRange db = new CodeRange(getPC(), getBranchTarget(), false);
                    optionalRanges.add(db);
                }
                break;
            case Const.ASTORE:
            case Const.ASTORE_0:
            case Const.ASTORE_1:
            case Const.ASTORE_2:
            case Const.ASTORE_3:
                {
                    if (stack.getStackDepth() > 0) {
                        PSCUserValue uv = (PSCUserValue) stack.getStackItem(0).getUserValue();
                        if (uv != null) {
                            storeToUserValue.put(getRegisterOperand(), uv);
                        }
                    }
                }
                break;
            case Const.ALOAD:
            case Const.ALOAD_0:
            case Const.ALOAD_1:
            case Const.ALOAD_2:
            case Const.ALOAD_3:
                {
                    userValue = storeToUserValue.get(getRegisterOperand());
                }
                break;
            case Const.PUTFIELD:
                {
                    if (stack.getStackDepth() > 0) {
                        PSCUserValue uv = (PSCUserValue) stack.getStackItem(0).getUserValue();
                        if (uv != null) {
                            storeToUserValue.put(getNameConstantOperand(), uv);
                        }
                    }
                }
                break;
            case Const.GETFIELD:
                {
                    userValue = storeToUserValue.get(getNameConstantOperand());
                }
        }
    } finally {
        stack.sawOpcode(this, seen);
        if ((userValue != null) && (stack.getStackDepth() > 0)) {
            OpcodeStack.Item item = stack.getStackItem(0);
            item.setUserValue(userValue);
            if (sawAlloc) {
                allocLocation.put(userValue.getAllocationNumber(), Integer.valueOf(getPC()));
            }
        }
    }
}

Example 2 with FQMethod

use of com.mebigfatguy.fbcontrib.utils.FQMethod in project fb-contrib by mebigfatguy.

the class PresizeCollections method branchBasedOnUnsizedObject.

/**
 * returns if the conditional is based on a method call from an object that has no sizing to determine what presize should be. it's possible the correct
 * implementation should just return true, if <code>if ((seen != IFNE) || (stack.getStackDepth() == 0))</code>
 *
 * @param seen
 *            the current visited opcode
 * @return whether this conditional is based on a unsized object
 */
private boolean branchBasedOnUnsizedObject(int seen) {
    if ((seen == Const.IF_ACMPEQ) || (seen == Const.IF_ACMPNE)) {
        return true;
    }
    if ((seen != Const.IFNE) || (stack.getStackDepth() == 0)) {
        return false;
    }
    OpcodeStack.Item itm = stack.getStackItem(0);
    XMethod xm = itm.getReturnValueOf();
    if (xm == null) {
        return false;
    }
    FQMethod fqm = new FQMethod(xm.getClassName().replace('.', '/'), xm.getName(), xm.getSignature());
    if (ITERATOR_HASNEXT.equals(fqm)) {
        PSCUserValue uv = (PSCUserValue) itm.getUserValue();
        if (uv == null) {
            return true;
        }
        return !uv.hasSizedSource();
    }
    return UNSIZED_SOURCES.contains(fqm);
}

Example 3 with FQMethod

use of com.mebigfatguy.fbcontrib.utils.FQMethod in project fb-contrib by mebigfatguy.

the class UseCharacterParameterizedMethod method sawOpcode.

/**
 * implements the visitor to look for method calls that pass a constant string as a parameter when the string is only one character long, and there is an
 * alternate method passing a character.
 */
@Override
public void sawOpcode(int seen) {
    try {
        stack.precomputation(this);
        if ((seen == Const.INVOKEVIRTUAL) || (seen == Const.INVOKEINTERFACE)) {
            FQMethod key = new FQMethod(getClassConstantOperand(), getNameConstantOperand(), getSigConstantOperand());
            Object posObject = characterMethods.get(key);
            if (posObject instanceof Integer) {
                if (checkSingleParamMethod(((Integer) posObject).intValue()) && !isInlineAppend(key)) {
                    reportBug();
                }
            } else if ((posObject instanceof IntPair) && checkDoubleParamMethod((IntPair) posObject)) {
                reportBug();
            }
        } else if (seen == Const.DUP) {
            if (stack.getStackDepth() > 0) {
                OpcodeStack.Item itm = stack.getStackItem(0);
                String duppedSig = itm.getSignature();
                if ("Ljava/lang/StringBuilder;".equals(duppedSig) || "Ljava/lang/StringBuffer;".equals(duppedSig)) {
                    itm.setUserValue(UCPMUserValue.INLINE);
                }
            }
        } else if ((seen == Const.PUTFIELD) || (((seen == Const.PUTSTATIC) || OpcodeUtils.isAStore(seen)) && (stack.getStackDepth() > 0))) {
            OpcodeStack.Item itm = stack.getStackItem(0);
            itm.setUserValue(null);
        }
    } finally {
        UCPMUserValue uv = callHasInline(seen);
        stack.sawOpcode(this, seen);
        if ((uv == UCPMUserValue.INLINE) && (stack.getStackDepth() > 0)) {
            OpcodeStack.Item itm = stack.getStackItem(0);
            itm.setUserValue(uv);
        }
    }
}

Example 4 with FQMethod

use of com.mebigfatguy.fbcontrib.utils.FQMethod in project fb-contrib by mebigfatguy.

the class UnnecessaryApiConversion method sawOpcode.

@Override
public void sawOpcode(int seen) {
    try {
        switch(seen) {
            case INVOKEVIRTUAL:
                FQMethod conversionMethod = new FQMethod(getClassConstantOperand(), getNameConstantOperand(), getSigConstantOperand());
                LegacyInfo legacyInfo = conversions.get(conversionMethod);
                if ((legacyInfo != null) && (stack.getStackDepth() > 0)) {
                    OpcodeStack.Item itm = stack.getStackItem(0);
                    XMethod xm = itm.getReturnValueOf();
                    if ((xm != null) && (xm.getName().equals(legacyInfo.methodName) && (xm.getClassName().equals(conversionMethod.getClassName().replace('/', '.'))))) {
                        bugReporter.reportBug(new BugInstance(this, legacyInfo.bugType.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this));
                    }
                }
                break;
            default:
                break;
        }
    } finally {
        stack.sawOpcode(this, seen);
    }
}

Example 5 with FQMethod

use of com.mebigfatguy.fbcontrib.utils.FQMethod in project fb-contrib by mebigfatguy.

the class StringifiedTypes method sawOpcode.

@Override
public void sawOpcode(int seen) {
    String userValue = null;
    int[] checkParms = null;
    try {
        stack.precomputation(this);
        int stackDepth = stack.getStackDepth();
        switch(seen) {
            case Const.INVOKEVIRTUAL:
                {
                    String clsName = getClassConstantOperand();
                    String methodName = getNameConstantOperand();
                    String sig = getSigConstantOperand();
                    boolean isStringBuilder = SignatureUtils.isPlainStringConvertableClass(clsName);
                    if (Values.TOSTRING.equals(methodName) && SignatureBuilder.SIG_VOID_TO_STRING.equals(sig)) {
                        if (isStringBuilder) {
                            if (stackDepth > 0) {
                                OpcodeStack.Item item = stack.getStackItem(0);
                                userValue = (String) item.getUserValue();
                            }
                        } else {
                            userValue = Values.TOSTRING;
                        }
                    } else if (isStringBuilder) {
                        if ("append".equals(methodName)) {
                            if (stackDepth > 0) {
                                OpcodeStack.Item item = stack.getStackItem(0);
                                userValue = (String) item.getUserValue();
                                if ((userValue == null) && !Values.SIG_JAVA_LANG_STRING.equals(item.getSignature())) {
                                    userValue = Values.TOSTRING;
                                    if (stackDepth > 1) {
                                        item = stack.getStackItem(1);
                                        int reg = item.getRegisterNumber();
                                        if (reg >= 0) {
                                            toStringStringBuilders.set(reg);
                                        }
                                    }
                                }
                            }
                        } else if ((stackDepth > 1) && "setLength".equals(methodName)) {
                            OpcodeStack.Item item = stack.getStackItem(1);
                            item.setUserValue(null);
                            int reg = item.getRegisterNumber();
                            if (reg >= 0) {
                                toStringStringBuilders.clear(reg);
                            }
                        }
                    } else if (Values.SLASHED_JAVA_LANG_STRING.equals(clsName)) {
                        Integer priority = STRING_PARSE_METHODS.get(methodName);
                        if (priority != null) {
                            int numParameters = SignatureUtils.getNumParameters(sig);
                            if (stackDepth > numParameters) {
                                OpcodeStack.Item item = stack.getStackItem(numParameters);
                                if ((item.getXField() != null) || FROM_FIELD.equals(item.getUserValue())) {
                                    bugReporter.reportBug(new BugInstance(this, BugType.STT_STRING_PARSING_A_FIELD.name(), priority.intValue()).addClass(this).addMethod(this).addSourceLine(this));
                                }
                            }
                        }
                    }
                }
                break;
            case Const.INVOKEINTERFACE:
                {
                    String clsName = getClassConstantOperand();
                    String methodName = getNameConstantOperand();
                    String sig = getSigConstantOperand();
                    int numParameters = SignatureUtils.getNumParameters(sig);
                    if (stackDepth > numParameters) {
                        FQMethod cm = new FQMethod(clsName, methodName, sig);
                        checkParms = COLLECTION_PARMS.get(cm);
                        if (checkParms != null) {
                            OpcodeStack.Item item = stack.getStackItem(numParameters);
                            if (item.getXField() == null) {
                                if (MAP_PUT.equals(cm)) {
                                    OpcodeStack.Item itm = stack.getStackItem(1);
                                    XMethod xm = itm.getReturnValueOf();
                                    if (xm != null) {
                                        if (Values.DOTTED_JAVA_LANG_STRINGBUILDER.equals(xm.getClassName())) {
                                            bugReporter.reportBug(new BugInstance(this, BugType.STT_TOSTRING_MAP_KEYING.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this));
                                        }
                                    }
                                }
                            } else {
                                for (int parm : checkParms) {
                                    if ((parm >= 0) && Values.TOSTRING.equals(stack.getStackItem(parm).getUserValue())) {
                                        bugReporter.reportBug(new BugInstance(this, BugType.STT_TOSTRING_STORED_IN_FIELD.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this));
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
                break;
            case Const.PUTFIELD:
                if (stackDepth > 0) {
                    OpcodeStack.Item item = stack.getStackItem(0);
                    if (Values.TOSTRING.equals(item.getUserValue())) {
                        bugReporter.reportBug(new BugInstance(this, BugType.STT_TOSTRING_STORED_IN_FIELD.name(), NORMAL_PRIORITY).addClass(this).addMethod(this).addSourceLine(this));
                    }
                }
                break;
            case Const.ALOAD:
            case Const.ALOAD_0:
            case Const.ALOAD_1:
            case Const.ALOAD_2:
            case Const.ALOAD_3:
                {
                    int reg = RegisterUtils.getALoadReg(this, seen);
                    if (toStringStringBuilders.get(reg)) {
                        userValue = Values.TOSTRING;
                    }
                }
                break;
            case Const.ASTORE:
            case Const.ASTORE_0:
            case Const.ASTORE_1:
            case Const.ASTORE_2:
            case Const.ASTORE_3:
                {
                    int reg = RegisterUtils.getAStoreReg(this, seen);
                    toStringStringBuilders.clear(reg);
                }
                break;
            default:
                break;
        }
    } finally {
        stack.sawOpcode(this, seen);
        if ((userValue != null) && (stack.getStackDepth() > 0)) {
            OpcodeStack.Item item = stack.getStackItem(0);
            item.setUserValue(userValue);
        }
        if ((checkParms != null) && (checkParms[0] == -1) && (stack.getStackDepth() > 0)) {
            OpcodeStack.Item item = stack.getStackItem(0);
            item.setUserValue(FROM_FIELD);
        }
    }
}