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/*
* FindBugs - Find bugs in Java programs
* Copyright (C) 2005, University of Maryland
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.umd.cs.findbugs.detect;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumMap;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.Map;
import edu.umd.cs.findbugs.util.ClassName;
import org.apache.bcel.Const;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.Code;
import org.apache.bcel.classfile.CodeException;
import org.apache.bcel.classfile.JavaClass;
import edu.umd.cs.findbugs.BugAccumulator;
import edu.umd.cs.findbugs.BugAnnotation;
import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.FieldAnnotation;
import edu.umd.cs.findbugs.IntAnnotation;
import edu.umd.cs.findbugs.LocalVariableAnnotation;
import edu.umd.cs.findbugs.MethodAnnotation;
import edu.umd.cs.findbugs.OpcodeStack;
import edu.umd.cs.findbugs.OpcodeStack.Item;
import edu.umd.cs.findbugs.Priorities;
import edu.umd.cs.findbugs.SourceLineAnnotation;
import edu.umd.cs.findbugs.SystemProperties;
import edu.umd.cs.findbugs.ba.AnalysisContext;
import edu.umd.cs.findbugs.ba.XFactory;
import edu.umd.cs.findbugs.ba.XField;
import edu.umd.cs.findbugs.ba.XMethod;
import edu.umd.cs.findbugs.ba.ch.Subtypes2;
import edu.umd.cs.findbugs.bcel.OpcodeStackDetector;
import edu.umd.cs.findbugs.classfile.ClassDescriptor;
import edu.umd.cs.findbugs.classfile.DescriptorFactory;
import edu.umd.cs.findbugs.classfile.FieldDescriptor;
import edu.umd.cs.findbugs.visitclass.Util;
public class FindPuzzlers extends OpcodeStackDetector {
static FieldDescriptor SYSTEM_OUT = new FieldDescriptor("java/lang/System", "out", "Ljava/io/PrintStream;", true);
static FieldDescriptor SYSTEM_ERR = new FieldDescriptor("java/lang/System", "err", "Ljava/io/PrintStream;", true);
final BugReporter bugReporter;
final BugAccumulator bugAccumulator;
private final boolean testingEnabled;
public FindPuzzlers(BugReporter bugReporter) {
this.bugReporter = bugReporter;
this.bugAccumulator = new BugAccumulator(bugReporter);
testingEnabled = SystemProperties.getBoolean("report_TESTING_pattern_in_standard_detectors");
}
@Override
public void visit(Code obj) {
prevOpcodeIncrementedRegister = -1;
best_priority_for_ICAST_INTEGER_MULTIPLY_CAST_TO_LONG = LOW_PRIORITY + 1;
prevOpCode = Const.NOP;
previousMethodInvocation = null;
badlyComputingOddState = 0;
resetIMulCastLong();
imul_distance = 10000;
ternaryConversionState = 0;
becameTop = -1;
super.visit(obj);
bugAccumulator.reportAccumulatedBugs();
pendingUnreachableBranch = null;
}
int becameTop;
int imul_constant;
int imul_distance;
boolean imul_operand_is_parameter;
int prevOpcodeIncrementedRegister;
int valueOfConstantArgumentToShift;
int best_priority_for_ICAST_INTEGER_MULTIPLY_CAST_TO_LONG;
boolean constantArgumentToShift;
boolean shiftOfNonnegativeValue;
int ternaryConversionState = 0;
int badlyComputingOddState;
int prevOpCode;
XMethod previousMethodInvocation;
boolean isTigerOrHigher;
static ClassDescriptor ITERATOR = DescriptorFactory.createClassDescriptor(Iterator.class);
static ClassDescriptor MAP_ENTRY = DescriptorFactory.createClassDescriptor(Map.Entry.class);
@Override
public void visit(JavaClass obj) {
isTigerOrHigher = obj.getMajor() >= Const.MAJOR_1_5;
try {
Subtypes2 subtypes2 = AnalysisContext.currentAnalysisContext().getSubtypes2();
ClassDescriptor me = getClassDescriptor();
if (subtypes2.isSubtype(me, MAP_ENTRY) && subtypes2.isSubtype(me, ITERATOR)) {
bugReporter.reportBug(new BugInstance(this, "PZ_DONT_REUSE_ENTRY_OBJECTS_IN_ITERATORS", NORMAL_PRIORITY)
.addClass(this).addString("shouldn't reuse Iterator as a Map.Entry"));
}
} catch (ClassNotFoundException e) {
AnalysisContext.reportMissingClass(e);
}
}
private void resetIMulCastLong() {
imul_constant = 1;
imul_operand_is_parameter = false;
}
private int adjustPriority(int factor, int priority) {
if (factor <= 4) {
return LOW_PRIORITY + 2;
}
if (factor <= 10000) {
return priority + 1;
}
if (factor <= 60 * 60 * 1000) {
return priority;
}
return priority - 1;
}
private int adjustMultiplier(Object constant, int mul) {
if (!(constant instanceof Integer)) {
return mul;
}
return Math.abs(((Integer) constant).intValue()) * mul;
}
@Override
public boolean beforeOpcode(int seen) {
super.beforeOpcode(seen);
return true;
}
BugInstance pendingUnreachableBranch;
@Override
public void sawOpcode(int seen) {
if (stack.isTop()) {
pendingUnreachableBranch = null;
if (becameTop == -1) {
becameTop = getPC();
}
if (testingEnabled && seen == Const.GOTO && getBranchTarget() < becameTop) {
pendingUnreachableBranch = new BugInstance(this, "TESTING", NORMAL_PRIORITY)
.addClassAndMethod(this).addString("Unreachable loop body").addSourceLineRange(this, becameTop, getPC());
}
return;
}
if (pendingUnreachableBranch != null) {
bugReporter.reportBug(pendingUnreachableBranch);
pendingUnreachableBranch = null;
}
becameTop = -1;
if (seen == Const.INVOKESPECIAL && Const.CONSTRUCTOR_NAME.equals(getNameConstantOperand()) && "(Ljava/util/Collection;)V".equals(
getSigConstantOperand())
&& getClassConstantOperand().contains("Set")
|| (seen == Const.INVOKEVIRTUAL || seen == Const.INVOKEINTERFACE) && "addAll".equals(getNameConstantOperand())
&& "(Ljava/util/Collection;)Z".equals(getSigConstantOperand())) {
OpcodeStack.Item top = stack.getStackItem(0);
XMethod returnValueOf = top.getReturnValueOf();
if (returnValueOf != null && "entrySet".equals(returnValueOf.getName())) {
String name = returnValueOf.getClassName();
int priority = Priorities.LOW_PRIORITY;
if ("java.util.Map".equals(name)) {
priority = Priorities.NORMAL_PRIORITY;
} else if (name.equals(EnumMap.class.getName())
|| name.equals(IdentityHashMap.class.getName())) {
priority = Priorities.HIGH_PRIORITY;
}
bugReporter.reportBug(new BugInstance(this, "DMI_ENTRY_SETS_MAY_REUSE_ENTRY_OBJECTS", priority)
.addClassAndMethod(this).addCalledMethod(returnValueOf).addCalledMethod(this).addValueSource(top, this).addSourceLine(this));
}
}
if (seen == Const.INVOKEVIRTUAL && "hashCode".equals(getNameConstantOperand()) && "()I".equals(getSigConstantOperand())
&& stack.getStackDepth() > 0) {
OpcodeStack.Item item0 = stack.getStackItem(0);
if (item0.getSignature().charAt(0) == '[') {
bugReporter.reportBug(new BugInstance(this, "DMI_INVOKING_HASHCODE_ON_ARRAY", NORMAL_PRIORITY)
.addClassAndMethod(this).addValueSource(item0, this).addSourceLine(this));
}
}
if (seen != Const.RETURN && isReturn(seen) && isRegisterStore(getPrevOpcode(1))) {
int priority = Priorities.NORMAL_PRIORITY;
if (getMethodSig().endsWith(")Z")) {
priority = Priorities.HIGH_PRIORITY;
} else {
if (getMethodSig().endsWith(")Ljava/lang/String;")) {
priority = Priorities.LOW_PRIORITY;
}
if (getPC() == getCode().getCode().length - 1) {
priority++;
}
}
bugReporter.reportBug(new BugInstance(this, "DLS_DEAD_LOCAL_STORE_IN_RETURN", priority).addClassAndMethod(this)
.addSourceLine(this));
}
// System.out.println(getPC() + " " + Const.getOpcodeName(seen) + " " +
// ternaryConversionState);
if (seen == Const.IMUL) {
if (imul_distance != 1) {
resetIMulCastLong();
}
imul_distance = 0;
if (stack.getStackDepth() > 1) {
OpcodeStack.Item item0 = stack.getStackItem(0);
OpcodeStack.Item item1 = stack.getStackItem(1);
imul_constant = adjustMultiplier(item0.getConstant(), imul_constant);
imul_constant = adjustMultiplier(item1.getConstant(), imul_constant);
if (item0.isInitialParameter() || item1.isInitialParameter()) {
imul_operand_is_parameter = true;
}
}
} else {
imul_distance++;
}
if (prevOpCode == Const.IMUL && seen == Const.I2L) {
int priority = adjustPriority(imul_constant, NORMAL_PRIORITY);
if (priority >= LOW_PRIORITY && imul_constant != 1000 && imul_constant != 60 && imul_operand_is_parameter) {
priority = NORMAL_PRIORITY;
}
if (priority <= best_priority_for_ICAST_INTEGER_MULTIPLY_CAST_TO_LONG) {
best_priority_for_ICAST_INTEGER_MULTIPLY_CAST_TO_LONG = priority;
bugAccumulator.accumulateBug(
new BugInstance(this, "ICAST_INTEGER_MULTIPLY_CAST_TO_LONG", priority).addClassAndMethod(this), this);
}
}
if (Const.STATIC_INITIALIZER_NAME.equals(getMethodName()) && (seen == Const.PUTSTATIC || seen == Const.GETSTATIC
|| seen == Const.INVOKESTATIC)) {
String clazz = getClassConstantOperand();
if (!clazz.equals(getClassName())) {
try {
JavaClass targetClass = Repository.lookupClass(clazz);
if (Repository.instanceOf(targetClass, getThisClass())) {
int priority = NORMAL_PRIORITY;
if (seen == Const.GETSTATIC) {
priority--;
}
if (!targetClass.isPublic()) {
priority++;
}
bugAccumulator.accumulateBug(new BugInstance(this, "IC_SUPERCLASS_USES_SUBCLASS_DURING_INITIALIZATION",
priority).addClassAndMethod(this).addClass(getClassConstantOperand()), this);
}
} catch (ClassNotFoundException e) {
// ignore it
}
}
}
/*
if (false && (seen == Const.INVOKEVIRTUAL) && getNameConstantOperand().equals("equals")
&& getSigConstantOperand().equals("(Ljava/lang/Object;)Z") && stack.getStackDepth() > 1) {
OpcodeStack.Item item0 = stack.getStackItem(0);
OpcodeStack.Item item1 = stack.getStackItem(1);
if (item0.isArray() || item1.isArray()) {
bugAccumulator.accumulateBug(
new BugInstance(this, "EC_BAD_ARRAY_COMPARE", NORMAL_PRIORITY).addClassAndMethod(this), this);
}
}
*/
if (seen >= Const.IALOAD && seen <= Const.SALOAD || seen >= Const.IASTORE && seen <= Const.SASTORE) {
Item index = stack.getStackItem(0);
if (index.getSpecialKind() == Item.AVERAGE_COMPUTED_USING_DIVISION) {
SourceLineAnnotation where;
if (index.getPC() >= 0) {
where = SourceLineAnnotation.fromVisitedInstruction(this, index.getPC());
} else {
where = SourceLineAnnotation.fromVisitedInstruction(this);
}
bugAccumulator.accumulateBug(
new BugInstance(this, "IM_AVERAGE_COMPUTATION_COULD_OVERFLOW", NORMAL_PRIORITY).addClassAndMethod(this),
where);
}
}
if (seen == Const.IMUL && (getPrevOpcode(1) == Const.SIPUSH || getPrevOpcode(1) == Const.BIPUSH) && getPrevOpcode(
2) == Const.IREM) {
bugAccumulator.accumulateBug(
new BugInstance(this, "IM_MULTIPLYING_RESULT_OF_IREM", LOW_PRIORITY).addClassAndMethod(this), this);
}
if (seen == Const.I2S && getPrevOpcode(1) == Const.IUSHR && !shiftOfNonnegativeValue
&& (!constantArgumentToShift || valueOfConstantArgumentToShift % 16 != 0) || seen == Const.I2B
&& getPrevOpcode(1) == Const.IUSHR && !shiftOfNonnegativeValue
&& (!constantArgumentToShift || valueOfConstantArgumentToShift % 8 != 0)) {
bugAccumulator.accumulateBug(
new BugInstance(this, "ICAST_QUESTIONABLE_UNSIGNED_RIGHT_SHIFT", NORMAL_PRIORITY).addClassAndMethod(this),
this);
}
if (seen == Const.IADD && (getNextOpcode() == Const.ISHL || getNextOpcode() == Const.LSHL) && stack.getStackDepth() >= 3) {
OpcodeStack.Item l = stack.getStackItem(2);
OpcodeStack.Item v = stack.getStackItem(1);
Object constantValue = v.getConstant();
// Ignore 1 << (const + var) as it's usually intended
if (constantValue instanceof Integer && !Integer.valueOf(1).equals(l.getConstant())) {
int c = ((Integer) constantValue).intValue();
int priority = LOW_PRIORITY;
// If (foo << 32 + var) encountered, then ((foo << 32) + var) is absolutely meaningless,
// but (foo << (32 + var)) can be meaningful for negative var values
if (c < 32 || (c < 64 && getNextOpcode() == Const.LSHL)) {
if (c == 8) {
priority--;
}
if (getPrevOpcode(1) == Const.IAND) {
priority--;
}
if (getMethodName().equals("hashCode") && getMethodSig().equals("()I")
&& (getCode().getCode()[getNextPC() + 1] & 0xFF) == Const.IRETURN) {
// commonly observed error is hashCode body like "return foo << 16 + bar;"
priority = HIGH_PRIORITY;
}
bugAccumulator.accumulateBug(new BugInstance(this, "BSHIFT_WRONG_ADD_PRIORITY", priority)
.addClassAndMethod(this)
.addInt(c).describe(IntAnnotation.INT_SHIFT)
.addValueSource(stack.getStackItem(2), this)
.addValueSource(stack.getStackItem(0), this), this);
}
}
}
constantArgumentToShift = false;
shiftOfNonnegativeValue = false;
if ((seen == Const.IUSHR || seen == Const.ISHR || seen == Const.ISHL)) {
if (stack.getStackDepth() <= 1) {
// don't understand; lie so other detectors won't get concerned
constantArgumentToShift = true;
valueOfConstantArgumentToShift = 8;
} else {
Object rightHandSide = stack.getStackItem(0).getConstant();
Object leftHandSide = stack.getStackItem(1).getConstant();
shiftOfNonnegativeValue = stack.getStackItem(1).isNonNegative();
if (rightHandSide instanceof Integer) {
constantArgumentToShift = true;
valueOfConstantArgumentToShift = ((Integer) rightHandSide);
if (valueOfConstantArgumentToShift < 0 || valueOfConstantArgumentToShift >= 32) {
bugAccumulator.accumulateBug(new BugInstance(this, "ICAST_BAD_SHIFT_AMOUNT",
valueOfConstantArgumentToShift < 0 ? LOW_PRIORITY
: (valueOfConstantArgumentToShift == 32
&& "hashCode".equals(getMethodName()) ? NORMAL_PRIORITY : HIGH_PRIORITY))
.addClassAndMethod(this).addInt(valueOfConstantArgumentToShift).describe(
IntAnnotation.INT_SHIFT)
.addValueSource(stack.getStackItem(1), this), this);
}
}
if (leftHandSide instanceof Integer && ((Integer) leftHandSide) > 0) {
// boring; lie so other detectors won't get concerned
constantArgumentToShift = true;
valueOfConstantArgumentToShift = 8;
}
}
}
if (seen == Const.INVOKEVIRTUAL && stack.getStackDepth() > 0
&& ("java/util/Date".equals(getClassConstantOperand()) || "java/sql/Date".equals(getClassConstantOperand()))
&& "setMonth".equals(getNameConstantOperand()) && "(I)V".equals(getSigConstantOperand())) {
OpcodeStack.Item item = stack.getStackItem(0);
Object o = item.getConstant();
if (o instanceof Integer) {
int v = (Integer) o;
if (v < 0 || v > 11) {
bugReporter.reportBug(new BugInstance(this, "DMI_BAD_MONTH", HIGH_PRIORITY).addClassAndMethod(this).addInt(v)
.describe(IntAnnotation.INT_VALUE).addCalledMethod(this).addSourceLine(this));
}
}
}
if (seen == Const.INVOKEVIRTUAL && stack.getStackDepth() > 1 && "java/util/Calendar".equals(getClassConstantOperand())
&& "set".equals(getNameConstantOperand())
|| seen == Const.INVOKESPECIAL && stack.getStackDepth() > 1
&& "java/util/GregorianCalendar".equals(getClassConstantOperand()) && Const.CONSTRUCTOR_NAME.equals(getNameConstantOperand())
) {
String sig = getSigConstantOperand();
if (sig.startsWith("(III")) {
int pos = sig.length() - 5;
OpcodeStack.Item item = stack.getStackItem(pos);
Object o = item.getConstant();
if (o instanceof Integer) {
int v = (Integer) o;
if (v < 0 || v > 11) {
bugReporter.reportBug(new BugInstance(this, "DMI_BAD_MONTH", NORMAL_PRIORITY).addClassAndMethod(this)
.addInt(v).describe(IntAnnotation.INT_VALUE).addCalledMethod(this).addSourceLine(this));
}
}
}
}
if (isRegisterStore() && (seen == Const.ISTORE || seen == Const.ISTORE_0 || seen == Const.ISTORE_1 || seen == Const.ISTORE_2
|| seen == Const.ISTORE_3)
&& getRegisterOperand() == prevOpcodeIncrementedRegister) {
bugAccumulator.accumulateBug(
new BugInstance(this, "DLS_OVERWRITTEN_INCREMENT", HIGH_PRIORITY).addClassAndMethod(this), this);
}
if (seen == Const.IINC) {
prevOpcodeIncrementedRegister = getRegisterOperand();
} else {
prevOpcodeIncrementedRegister = -1;
}
// Java Puzzlers, Chapter 2, puzzle 1
// Look for ICONST_2 IREM ICONST_1 IF_ICMPNE L1
switch (badlyComputingOddState) {
case 0:
if (seen == Const.ICONST_2) {
badlyComputingOddState++;
}
break;
case 1:
if (seen == Const.IREM) {
OpcodeStack.Item item = stack.getStackItem(1);
if (!item.isNonNegative() && item.getSpecialKind() != OpcodeStack.Item.MATH_ABS) {
badlyComputingOddState++;
} else {
badlyComputingOddState = 0;
}
} else {
badlyComputingOddState = 0;
}
break;
case 2:
if (seen == Const.ICONST_1) {
badlyComputingOddState++;
} else {
badlyComputingOddState = 0;
}
break;
case 3:
if (seen == Const.IF_ICMPEQ || seen == Const.IF_ICMPNE) {
bugAccumulator.accumulateBug(
new BugInstance(this, "IM_BAD_CHECK_FOR_ODD", NORMAL_PRIORITY).addClassAndMethod(this), this);
}
badlyComputingOddState = 0;
break;
default:
break;
}
// Java Puzzlers, chapter 3, puzzle 12
if (seen == Const.INVOKEVIRTUAL
&& stack.getStackDepth() > 0
&& ("toString".equals(getNameConstantOperand()) && "()Ljava/lang/String;".equals(getSigConstantOperand())
|| "append".equals(getNameConstantOperand())
&& "(Ljava/lang/Object;)Ljava/lang/StringBuilder;".equals(getSigConstantOperand())
&& "java/lang/StringBuilder".equals(getClassConstantOperand())
|| "append".equals(getNameConstantOperand())
&& "(Ljava/lang/Object;)Ljava/lang/StringBuffer;".equals(getSigConstantOperand())
&& "java/lang/StringBuffer".equals(getClassConstantOperand()) || ("print".equals(getNameConstantOperand())
|| "println".equals(getNameConstantOperand()))
&& "(Ljava/lang/Object;)V".equals(getSigConstantOperand()))) {
OpcodeStack.Item item = stack.getStackItem(0);
String signature = item.getSignature();
if (signature != null && signature.startsWith("[")) {
boolean debuggingContext = "[Ljava/lang/StackTraceElement;".equals(signature);
if (!debuggingContext) {
for (CodeException e : getCode().getExceptionTable()) {
if (e.getHandlerPC() <= getPC() && e.getHandlerPC() + 30 >= getPC()) {
debuggingContext = true;
}
}
for (int i = 1; !debuggingContext && i < stack.getStackDepth(); i++) {
OpcodeStack.Item e = stack.getStackItem(i);
if (e.getSignature().indexOf("Logger") >= 0 || e.getSignature().indexOf("Exception") >= 0) {
debuggingContext = true;
}
XField f = e.getXField();
if (f != null && (SYSTEM_ERR.equals(f.getFieldDescriptor()) || SYSTEM_OUT.equals(f.getFieldDescriptor()))) {
debuggingContext = true;
}
}
}
// String name = null;
int reg = item.getRegisterNumber();
Collection as = new ArrayList<>();
XField field = item.getXField();
FieldAnnotation fieldAnnotation = null;
if (field != null) {
fieldAnnotation = FieldAnnotation.fromXField(field);
fieldAnnotation.setDescription(FieldAnnotation.LOADED_FROM_ROLE);
}
if (reg != -1) {
LocalVariableAnnotation lva = LocalVariableAnnotation.getLocalVariableAnnotation(getMethod(), reg, getPC(),
getPC() - 1);
if (lva.isNamed()) {
as.add(lva);
if (fieldAnnotation != null) {
as.add(fieldAnnotation);
}
} else {
if (fieldAnnotation != null) {
as.add(fieldAnnotation);
}
as.add(lva);
}
} else if (fieldAnnotation != null) {
as.add(fieldAnnotation);
} else {
XMethod m = item.getReturnValueOf();
if (m != null) {
MethodAnnotation methodAnnotation = MethodAnnotation.fromXMethod(m);
methodAnnotation.setDescription(MethodAnnotation.METHOD_RETURN_VALUE_OF);
as.add(methodAnnotation);
}
}
int priority = debuggingContext ? NORMAL_PRIORITY : HIGH_PRIORITY;
if (!as.isEmpty()) {
bugAccumulator.accumulateBug(new BugInstance(this, "DMI_INVOKING_TOSTRING_ON_ARRAY", priority)
.addClassAndMethod(this).addAnnotations(as), this);
} else {
bugAccumulator.accumulateBug(
new BugInstance(this, "DMI_INVOKING_TOSTRING_ON_ANONYMOUS_ARRAY", priority).addClassAndMethod(this),
this);
}
}
}
if (isTigerOrHigher) {
if (previousMethodInvocation != null && prevOpCode == Const.INVOKEVIRTUAL && seen == Const.INVOKESTATIC) {
String classNameForPreviousMethod = previousMethodInvocation.getClassName();
String classNameForThisMethod = ClassName.toDottedClassName(getClassConstantOperand());
if (classNameForPreviousMethod.startsWith("java.lang.")
&& classNameForPreviousMethod.equals(classNameForThisMethod)
&& previousMethodInvocation.getName().endsWith("Value")
&& previousMethodInvocation.getSignature().length() == 3
&& "valueOf".equals(getNameConstantOperand())
&& getSigConstantOperand().charAt(1) == previousMethodInvocation.getSignature().charAt(2)) {
bugAccumulator.accumulateBug(
new BugInstance(this, "BX_UNBOXING_IMMEDIATELY_REBOXED", NORMAL_PRIORITY).addClassAndMethod(this)
.addCalledMethod(this),
this);
}
}
if (previousMethodInvocation != null && prevOpCode == Const.INVOKESPECIAL && seen == Const.INVOKEVIRTUAL) {
String classNameForPreviousMethod = previousMethodInvocation.getClassName();
String classNameForThisMethod = ClassName.toDottedClassName(getClassConstantOperand());
if (classNameForPreviousMethod.startsWith("java.lang.")
&& classNameForPreviousMethod.equals(classNameForThisMethod)
&& getNameConstantOperand().endsWith("Value") && getSigConstantOperand().length() == 3) {
if (getSigConstantOperand().charAt(2) == previousMethodInvocation.getSignature().charAt(1)) {
bugAccumulator.accumulateBug(
new BugInstance(this, "BX_BOXING_IMMEDIATELY_UNBOXED", NORMAL_PRIORITY).addClassAndMethod(this),
this);
} else {
bugAccumulator.accumulateBug(new BugInstance(this, "BX_BOXING_IMMEDIATELY_UNBOXED_TO_PERFORM_COERCION",
NORMAL_PRIORITY).addClassAndMethod(this), this);
}
ternaryConversionState = 1;
} else {
ternaryConversionState = 0;
}
} else if (seen == Const.INVOKEVIRTUAL) {
if (getClassConstantOperand().startsWith("java/lang") && getNameConstantOperand().endsWith("Value")
&& getSigConstantOperand().length() == 3) {
ternaryConversionState = 1;
} else {
ternaryConversionState = 0;
}
} else if (ternaryConversionState == 1) {
if (Const.I2L < seen && seen <= Const.I2S) {
ternaryConversionState = 2;
} else {
ternaryConversionState = 0;
}
} else if (ternaryConversionState == 2) {
ternaryConversionState = 0;
if (seen == Const.GOTO) {
bugReporter.reportBug(new BugInstance(this, "BX_UNBOXED_AND_COERCED_FOR_TERNARY_OPERATOR", NORMAL_PRIORITY)
.addClassAndMethod(this).addSourceLine(this));
}
} else {
ternaryConversionState = 0;
}
}
AssertInvokedFromRun: if (seen == Const.INVOKESTATIC) {
if ((getNameConstantOperand().startsWith("assert") || getNameConstantOperand().startsWith("fail"))
&& "run".equals(getMethodName()) && implementsRunnable(getThisClass())) {
int size1 = Util.getSizeOfSurroundingTryBlock(getConstantPool(), getMethod().getCode(), "java/lang/Throwable",
getPC());
int size2 = Util.getSizeOfSurroundingTryBlock(getConstantPool(), getMethod().getCode(), "java/lang/Error",
getPC());
int size3 = Util.getSizeOfSurroundingTryBlock(getConstantPool(), getMethod().getCode(),
"java/lang/AssertionFailureError", getPC());
int size = Math.min(Math.min(size1, size2), size3);
if (size == Integer.MAX_VALUE) {
String dottedClassName = ClassName.toDottedClassName(getClassConstantOperand());
if (!dottedClassName.startsWith("junit")) {
try {
JavaClass targetClass = AnalysisContext.currentAnalysisContext().lookupClass(dottedClassName);
if (!targetClass.getSuperclassName().startsWith("junit")) {
break AssertInvokedFromRun;
}
} catch (ClassNotFoundException e) {
AnalysisContext.reportMissingClass(e);
break AssertInvokedFromRun;
}
}
bugAccumulator.accumulateBug(new BugInstance(this, "IJU_ASSERT_METHOD_INVOKED_FROM_RUN_METHOD",
extendsThread(getThisClass()) ? NORMAL_PRIORITY : LOW_PRIORITY).addClassAndMethod(this), this);
}
}
}
if (seen == Const.INVOKESPECIAL && getClassConstantOperand().startsWith("java/lang/")
&& Const.CONSTRUCTOR_NAME.equals(getNameConstantOperand()) && getSigConstantOperand().length() == 4) {
previousMethodInvocation = XFactory.createReferencedXMethod(this);
} else if (seen == Const.INVOKESTATIC && getClassConstantOperand().startsWith("java/lang/")
&& "valueOf".equals(getNameConstantOperand()) && getSigConstantOperand().length() == 4) {
previousMethodInvocation = XFactory.createReferencedXMethod(this);
} else if (seen == Const.INVOKEVIRTUAL && getClassConstantOperand().startsWith("java/lang/")
&& getNameConstantOperand().endsWith("Value")
&& getSigConstantOperand().length() == 3) {
previousMethodInvocation = XFactory.createReferencedXMethod(this);
} else {
previousMethodInvocation = null;
}
if (testingEnabled && seen == Const.IAND || seen == Const.LAND) {
OpcodeStack.Item rhs = stack.getStackItem(0);
OpcodeStack.Item lhs = stack.getStackItem(1);
Object constant = rhs.getConstant();
OpcodeStack.Item value = lhs;
if (constant == null) {
constant = lhs.getConstant();
value = rhs;
}
if (constant instanceof Number && (seen == Const.LAND || value.getSpecialKind() == OpcodeStack.Item.RESULT_OF_L2I)) {
long constantValue = ((Number) constant).longValue();
if ((constantValue == 0xEFFFFFFFL || constantValue == 0xEFFFFFFFFFFFFFFFL || seen == Const.IAND
&& constantValue == 0xEFFFFFFF)) {
bugAccumulator.accumulateBug(new BugInstance(this, "TESTING", seen == Const.LAND ? HIGH_PRIORITY : NORMAL_PRIORITY)
.addClassAndMethod(this).addString("Possible failed attempt to mask lower 31 bits of an int")
.addValueSource(value, this), this);
}
}
}
if (seen == Const.INEG) {
OpcodeStack.Item top = stack.getStackItem(0);
XMethod m = top.getReturnValueOf();
if (m != null) {
if ("compareTo".equals(m.getName()) || "compare".equals(m.getName())) {
bugAccumulator.accumulateBug(new BugInstance(this, "RV_NEGATING_RESULT_OF_COMPARETO", NORMAL_PRIORITY)
.addClassAndMethod(this)
.addCalledMethod(m).addValueSource(top, this), this);
}
}
}
prevOpCode = seen;
}
boolean implementsRunnable(JavaClass obj) {
return Subtypes2.instanceOf(obj, "java.lang.Runnable");
}
boolean extendsThread(JavaClass obj) {
return Subtypes2.instanceOf(obj, "java.lang.Thread");
}
}