@Override
public void transferInstruction(InstructionHandle handle, BasicBlock basicBlock, LockSet fact)
throws DataflowAnalysisException {
Instruction ins = handle.getInstruction();
short opcode = ins.getOpcode();
if (opcode == Constants.MONITORENTER || opcode == Constants.MONITOREXIT) {
ValueNumberFrame frame = vnaDataflow.getFactAtLocation(new Location(handle, basicBlock));
modifyLock(frame, fact, opcode == Constants.MONITORENTER ? 1 : -1);
} else if (opcode == Constants.INVOKEVIRTUAL || opcode == Constants.INVOKEINTERFACE) {
InvokeInstruction inv = (InvokeInstruction) ins;
String name = inv.getMethodName(methodGen.getConstantPool());
String sig = inv.getSignature(methodGen.getConstantPool());
ValueNumberFrame frame = vnaDataflow.getFactAtLocation(new Location(handle, basicBlock));
if ("()V".equals(sig) && ("lock".equals(name) || "lockInterruptibly".equals(name))) {
modifyLock(frame, fact, 1);
} else if ("()V".equals(sig) && ("unlock".equals(name))) {
modifyLock(frame, fact, -1);
}
} else if ((ins instanceof ReturnInstruction) && isSynchronized && !isStatic) {
lockOp(fact, vna.getThisValue().getNumber(), -1);
}
}
/** Start the method's visit. */
public void start() {
if (!mg.isAbstract() && !mg.isNative()) {
for (InstructionHandle ih = mg.getInstructionList().getStart();
ih != null;
ih = ih.getNext()) {
Instruction i = ih.getInstruction();
if (!visitInstruction(i)) i.accept(this);
}
updateExceptionHandlers();
}
}
CFG createCFG(String className) throws ClassNotFoundException {
CFG cfg = new CFG();
JavaClass jc = Repository.lookupClass(className);
ClassGen cg = new ClassGen(jc);
ConstantPoolGen cpg = cg.getConstantPool();
for (Method m : cg.getMethods()) {
MethodGen mg = new MethodGen(m, cg.getClassName(), cpg);
InstructionList il = mg.getInstructionList();
InstructionHandle[] handles = il.getInstructionHandles();
int prev = 0;
for (InstructionHandle ih : handles) {
int position = ih.getPosition();
cfg.addNode(position, m, jc);
Instruction inst = ih.getInstruction();
boolean br = inst.getName().contains("if") || inst.getName().contains("goto");
boolean ret = inst.getName().contains("return");
boolean stat = inst.getName().contains("invokestatic");
int len = inst.getLength();
if (stat) {
int index = inst.toString(true).indexOf(" ");
String name = inst.toString(true).substring(index + 1);
int tar = Integer.valueOf(name);
INVOKESTATIC inv = new INVOKESTATIC(tar);
name = inv.getMethodName(cpg);
Method m2 = null;
Method[] tm = cg.getMethods();
for (int i = 0; i < tm.length; i++) {
if (tm[i].getName().equals(name)) {
m2 = tm[i];
}
}
cfg.addEdge(position, m, jc, 0, m2, jc);
cfg.addEdge(-1, m2, jc, position + len, m, jc);
}
if (!ret && !stat) {
cfg.addEdge(position, position + len, m, jc);
}
if (br) {
cfg.addEdge(position, position + len, m, jc);
IF_ICMPGE comp = new IF_ICMPGE(ih);
String name = comp.getTarget().toString(false);
int index = name.indexOf(">");
name = name.substring(index + 2);
int tar = Integer.valueOf(name);
cfg.addEdge(position, tar, m, jc);
}
if (ret) {
cfg.addEdge(position, -1, m, jc);
}
prev = position;
}
System.out.println(cfg.toString());
}
return cfg;
}
/** Visit a single instruction. */
private boolean visitInstruction(Instruction i) {
short opcode = i.getOpcode();
return ((InstructionConstants.INSTRUCTIONS[opcode] != null)
&& !(i instanceof ConstantPushInstruction)
&& !(i instanceof ReturnInstruction));
}
/*
* (non-Javadoc)
*
* @see
* edu.umd.cs.findbugs.classfile.IAnalysisEngine#analyze(edu.umd.cs.findbugs
* .classfile.IAnalysisCache, java.lang.Object)
*/
public LoadedFieldSet analyze(IAnalysisCache analysisCache, MethodDescriptor descriptor)
throws CheckedAnalysisException {
MethodGen methodGen = getMethodGen(analysisCache, descriptor);
if (methodGen == null) return null;
InstructionList il = methodGen.getInstructionList();
LoadedFieldSet loadedFieldSet = new LoadedFieldSet(methodGen);
ConstantPoolGen cpg = getConstantPoolGen(analysisCache, descriptor.getClassDescriptor());
for (InstructionHandle handle = il.getStart(); handle != null; handle = handle.getNext()) {
Instruction ins = handle.getInstruction();
short opcode = ins.getOpcode();
try {
if (opcode == Constants.INVOKESTATIC) {
INVOKESTATIC inv = (INVOKESTATIC) ins;
if (Hierarchy.isInnerClassAccess(inv, cpg)) {
InnerClassAccess access = Hierarchy.getInnerClassAccess(inv, cpg);
/*
* if (access == null) {
* System.out.println("Missing inner class access in " +
* SignatureConverter.convertMethodSignature(methodGen)
* + " at " + inv); }
*/
if (access != null) {
if (access.isLoad()) loadedFieldSet.addLoad(handle, access.getField());
else loadedFieldSet.addStore(handle, access.getField());
}
}
} else if (fieldInstructionOpcodeSet.get(opcode)) {
boolean isLoad = (opcode == Constants.GETFIELD || opcode == Constants.GETSTATIC);
XField field = Hierarchy.findXField((FieldInstruction) ins, cpg);
if (field != null) {
if (isLoad) loadedFieldSet.addLoad(handle, field);
else loadedFieldSet.addStore(handle, field);
}
}
} catch (ClassNotFoundException e) {
AnalysisContext.currentAnalysisContext().getLookupFailureCallback().reportMissingClass(e);
}
}
return loadedFieldSet;
}
/**
* Determine if given Instruction is a monitor wait.
*
* @param ins the Instruction
* @param cpg the ConstantPoolGen for the Instruction
* @return true if the instruction is a monitor wait, false if not
*/
public static boolean isMonitorNotify(Instruction ins, ConstantPoolGen cpg) {
if (!(ins instanceof InvokeInstruction)) return false;
if (ins.getOpcode() == Constants.INVOKESTATIC) return false;
InvokeInstruction inv = (InvokeInstruction) ins;
String methodName = inv.getMethodName(cpg);
String methodSig = inv.getSignature(cpg);
return isMonitorNotify(methodName, methodSig);
}
@Override
public void visitInstructionHandle(InstructionHandle handle) {
try {
Instruction ins = handle.getInstruction();
short opcode = ins.getOpcode();
if (DEBUG)
System.out.printf("%3d %s%n", handle.getPosition(), Constants.OPCODE_NAMES[opcode]);
if (opcode == Constants.PUTFIELD
|| opcode == Constants.PUTSTATIC
|| opcode == Constants.ARETURN) {
//
// A value is being assigned to a field or returned from
// the method.
//
Location loc = new Location(handle, curBlock);
TypeFrame typeFrame = typeDataflow.getFactAtLocation(loc);
if (!typeFrame.isValid()) {
// dead code?
couldNotAnalyze = true;
}
Type tosType = typeFrame.getTopValue();
if (tosType instanceof ObjectType
&& isPossibleInstanceOfObligationType(
subtypes2, (ObjectType) tosType, possiblyLeakedObligation.getType())) {
// Remove one obligation of this type
adjustedLeakCount--;
if (DEBUG)
System.out.println(
"removing obligation to close " + tosType + " at " + handle.getPosition());
}
}
if (COMPUTE_TRANSFERS && ins instanceof InvokeInstruction) {
checkForPossibleObligationTransfer((InvokeInstruction) ins, handle);
}
} catch (ClassNotFoundException e) {
bugReporter.reportMissingClass(e);
couldNotAnalyze = true;
} catch (DataflowAnalysisException e) {
couldNotAnalyze = true;
}
}
/* 70: */
/* 71: */ public static final Instruction readInstruction(ByteSequence bytes)
/* 72: */ throws IOException
/* 73: */ {
/* 74:167 */ boolean wide = false;
/* 75:168 */ short opcode = (short) bytes.readUnsignedByte();
/* 76:169 */ Instruction obj = null;
/* 77:171 */ if (opcode == 196)
/* 78: */ {
/* 79:172 */ wide = true;
/* 80:173 */ opcode = (short) bytes.readUnsignedByte();
/* 81: */ }
/* 82:176 */ if (InstructionConstants.INSTRUCTIONS[opcode] != null) {
/* 83:177 */ return InstructionConstants.INSTRUCTIONS[opcode];
/* 84: */ }
/* 85: */ Class clazz;
/* 86: */ try
/* 87: */ {
/* 88:184 */ clazz = Class.forName(className(opcode));
/* 89: */ }
/* 90: */ catch (ClassNotFoundException cnfe)
/* 91: */ {
/* 92:189 */ throw new ClassGenException("Illegal opcode detected.");
/* 93: */ }
/* 94: */ try
/* 95: */ {
/* 96:192 */ obj = (Instruction) clazz.newInstance();
/* 97:194 */ if ((wide)
&& (!(obj instanceof LocalVariableInstruction))
&& (!(obj instanceof IINC))
&& (!(obj instanceof RET))) {
/* 98:196 */ throw new Exception("Illegal opcode after wide: " + opcode);
/* 99: */ }
/* 100:198 */ obj.setOpcode(opcode);
/* 101:199 */ obj.initFromFile(bytes, wide);
/* 102: */ }
/* 103: */ catch (Exception e)
/* 104: */ {
/* 105:201 */ throw new ClassGenException(e.toString());
/* 106: */ }
/* 107:203 */ return obj;
/* 108: */ }
/**
* Transforms invoke instructions that match the specified list for this class to call the
* specified static call instead.
*/
private InstructionList xform_inst(MethodGen mg, Instruction inst) {
switch (inst.getOpcode()) {
case Constants.INVOKESTATIC:
{
InstructionList il = new InstructionList();
INVOKESTATIC is = (INVOKESTATIC) inst;
String cname = is.getClassName(pgen);
String mname = is.getMethodName(pgen);
Type[] args = is.getArgumentTypes(pgen);
MethodDef orig = new MethodDef(cname + "." + mname, args);
MethodInfo call = method_map.get(orig);
if (call != null) {
call.cnt++;
String classname = call.method_class;
String methodname = mname;
debug_map.log(
"%s.%s: Replacing method %s.%s (%s) with %s.%s%n",
mg.getClassName(),
mg.getName(),
cname,
mname,
UtilMDE.join(args, ", "),
classname,
methodname);
il.append(
ifact.createInvoke(
classname, methodname, is.getReturnType(pgen), args, Constants.INVOKESTATIC));
}
return (il);
}
case Constants.INVOKEVIRTUAL:
{
InstructionList il = new InstructionList();
INVOKEVIRTUAL iv = (INVOKEVIRTUAL) inst;
String cname = iv.getClassName(pgen);
String mname = iv.getMethodName(pgen);
Type[] args = iv.getArgumentTypes(pgen);
Type instance_type = iv.getReferenceType(pgen);
Type[] new_args = BCELUtil.insert_type(instance_type, args);
MethodDef orig = new MethodDef(cname + "." + mname, args);
if (debug_class) System.out.printf("looking for %s in map %s%n", orig, method_map);
MethodInfo call = method_map.get(orig);
if (call != null) {
call.cnt++;
String classname = call.method_class;
String methodname = mname;
debug_map.log(
"Replacing method %s.%s (%s) with %s.%s%n",
cname, mname, ArraysMDE.toString(args), classname, methodname);
il.append(
ifact.createInvoke(
classname,
methodname,
iv.getReturnType(pgen),
new_args,
Constants.INVOKESTATIC));
}
return (il);
}
default:
return (null);
}
}
/**
* Adds all the constants found in the given class into the given ConstantSet, and returns it.
*
* @see #getConstants(String)
*/
public static ConstantSet getConstants(String classname, ConstantSet result) {
ClassParser cp;
JavaClass jc;
try {
String classfileBase = classname.replace('.', '/');
InputStream is = ClassPath.SYSTEM_CLASS_PATH.getInputStream(classfileBase, ".class");
cp = new ClassParser(is, classname);
jc = cp.parse();
} catch (java.io.IOException e) {
throw new Error("IOException while reading '" + classname + "': " + e.getMessage());
}
result.classname = jc.getClassName();
// Get all of the constants from the pool
ConstantPool constant_pool = jc.getConstantPool();
for (Constant c : constant_pool.getConstantPool()) {
// System.out.printf ("*Constant = %s%n", c);
if (c == null
|| c instanceof ConstantClass
|| c instanceof ConstantFieldref
|| c instanceof ConstantInterfaceMethodref
|| c instanceof ConstantMethodref
|| c instanceof ConstantNameAndType
|| c instanceof ConstantUtf8) {
continue;
}
if (c instanceof ConstantString) {
result.strings.add((String) ((ConstantString) c).getConstantValue(constant_pool));
} else if (c instanceof ConstantDouble) {
result.doubles.add((Double) ((ConstantDouble) c).getConstantValue(constant_pool));
} else if (c instanceof ConstantFloat) {
result.floats.add((Float) ((ConstantFloat) c).getConstantValue(constant_pool));
} else if (c instanceof ConstantInteger) {
result.ints.add((Integer) ((ConstantInteger) c).getConstantValue(constant_pool));
} else if (c instanceof ConstantLong) {
result.longs.add((Long) ((ConstantLong) c).getConstantValue(constant_pool));
} else {
throw new RuntimeException("Unrecognized constant of type " + c.getClass() + ": " + c);
}
}
ClassGen gen = new ClassGen(jc);
ConstantPoolGen pool = gen.getConstantPool();
// Process the code in each method looking for literals
for (Method m : jc.getMethods()) {
MethodGen mg = new MethodGen(m, jc.getClassName(), pool);
InstructionList il = mg.getInstructionList();
if (il == null) {
// System.out.println("No instructions for " + mg);
} else {
for (Instruction inst : il.getInstructions()) {
switch (inst.getOpcode()) {
// Compare two objects, no literals
case Constants.IF_ACMPEQ:
case Constants.IF_ACMPNE:
break;
// These instructions compare the integer on the top of the stack
// to zero. There are no literals here (except 0)
case Constants.IFEQ:
case Constants.IFNE:
case Constants.IFLT:
case Constants.IFGE:
case Constants.IFGT:
case Constants.IFLE:
{
break;
}
// Instanceof pushes either 0 or 1 on the stack depending on whether
// the object on top of stack is of the specified type.
// If were interested in class literals, this would be interesting
case Constants.INSTANCEOF:
break;
// Duplicates the item on the top of stack. No literal.
case Constants.DUP:
{
break;
}
// Duplicates the item on the top of the stack and inserts it 2
// values down in the stack. No literals
case Constants.DUP_X1:
{
break;
}
// Duplicates either the top 2 category 1 values or a single
// category 2 value and inserts it 2 or 3 values down on the
// stack.
case Constants.DUP2_X1:
{
break;
}
// Duplicate either one category 2 value or two category 1 values.
case Constants.DUP2:
{
break;
}
// Dup the category 1 value on the top of the stack and insert it either
// two or three values down on the stack.
case Constants.DUP_X2:
{
break;
}
case Constants.DUP2_X2:
{
break;
}
// Pop instructions discard the top of the stack.
case Constants.POP:
{
break;
}
// Pops either the top 2 category 1 values or a single category 2 value
// from the top of the stack.
case Constants.POP2:
{
break;
}
// Swaps the two category 1 types on the top of the stack.
case Constants.SWAP:
{
break;
}
// Compares two integers on the stack
case Constants.IF_ICMPEQ:
case Constants.IF_ICMPGE:
case Constants.IF_ICMPGT:
case Constants.IF_ICMPLE:
case Constants.IF_ICMPLT:
case Constants.IF_ICMPNE:
{
break;
}
// Get the value of a field
case Constants.GETFIELD:
{
break;
}
// stores the top of stack into a field
case Constants.PUTFIELD:
{
break;
}
// Pushes the value of a static field on the stack
case Constants.GETSTATIC:
{
break;
}
// Pops a value off of the stack into a static field
case Constants.PUTSTATIC:
{
break;
}
// pushes a local onto the stack
case Constants.DLOAD:
case Constants.DLOAD_0:
case Constants.DLOAD_1:
case Constants.DLOAD_2:
case Constants.DLOAD_3:
case Constants.FLOAD:
case Constants.FLOAD_0:
case Constants.FLOAD_1:
case Constants.FLOAD_2:
case Constants.FLOAD_3:
case Constants.ILOAD:
case Constants.ILOAD_0:
case Constants.ILOAD_1:
case Constants.ILOAD_2:
case Constants.ILOAD_3:
case Constants.LLOAD:
case Constants.LLOAD_0:
case Constants.LLOAD_1:
case Constants.LLOAD_2:
case Constants.LLOAD_3:
{
break;
}
// Pops a value off of the stack into a local
case Constants.DSTORE:
case Constants.DSTORE_0:
case Constants.DSTORE_1:
case Constants.DSTORE_2:
case Constants.DSTORE_3:
case Constants.FSTORE:
case Constants.FSTORE_0:
case Constants.FSTORE_1:
case Constants.FSTORE_2:
case Constants.FSTORE_3:
case Constants.ISTORE:
case Constants.ISTORE_0:
case Constants.ISTORE_1:
case Constants.ISTORE_2:
case Constants.ISTORE_3:
case Constants.LSTORE:
case Constants.LSTORE_0:
case Constants.LSTORE_1:
case Constants.LSTORE_2:
case Constants.LSTORE_3:
{
break;
}
// Push a value from the runtime constant pool. We'll get these
// values when processing the constant pool itself
case Constants.LDC:
case Constants.LDC_W:
case Constants.LDC2_W:
{
break;
}
// Push the length of an array on the stack
case Constants.ARRAYLENGTH:
{
break;
}
// Push small constants (-1..5) on the stack. These literals are
// too common to bother mentioning
case Constants.DCONST_0:
case Constants.DCONST_1:
case Constants.FCONST_0:
case Constants.FCONST_1:
case Constants.FCONST_2:
case Constants.ICONST_0:
case Constants.ICONST_1:
case Constants.ICONST_2:
case Constants.ICONST_3:
case Constants.ICONST_4:
case Constants.ICONST_5:
case Constants.ICONST_M1:
case Constants.LCONST_0:
case Constants.LCONST_1:
{
break;
}
case Constants.BIPUSH:
case Constants.SIPUSH:
{
ConstantPushInstruction cpi = (ConstantPushInstruction) inst;
result.ints.add((Integer) cpi.getValue());
break;
}
// Primitive Binary operators.
case Constants.DADD:
case Constants.DCMPG:
case Constants.DCMPL:
case Constants.DDIV:
case Constants.DMUL:
case Constants.DREM:
case Constants.DSUB:
case Constants.FADD:
case Constants.FCMPG:
case Constants.FCMPL:
case Constants.FDIV:
case Constants.FMUL:
case Constants.FREM:
case Constants.FSUB:
case Constants.IADD:
case Constants.IAND:
case Constants.IDIV:
case Constants.IMUL:
case Constants.IOR:
case Constants.IREM:
case Constants.ISHL:
case Constants.ISHR:
case Constants.ISUB:
case Constants.IUSHR:
case Constants.IXOR:
case Constants.LADD:
case Constants.LAND:
case Constants.LCMP:
case Constants.LDIV:
case Constants.LMUL:
case Constants.LOR:
case Constants.LREM:
case Constants.LSHL:
case Constants.LSHR:
case Constants.LSUB:
case Constants.LUSHR:
case Constants.LXOR:
break;
case Constants.LOOKUPSWITCH:
case Constants.TABLESWITCH:
break;
case Constants.ANEWARRAY:
case Constants.NEWARRAY:
{
break;
}
case Constants.MULTIANEWARRAY:
{
break;
}
// push the value at an index in an array
case Constants.AALOAD:
case Constants.BALOAD:
case Constants.CALOAD:
case Constants.DALOAD:
case Constants.FALOAD:
case Constants.IALOAD:
case Constants.LALOAD:
case Constants.SALOAD:
{
break;
}
// Pop the top of stack into an array location
case Constants.AASTORE:
case Constants.BASTORE:
case Constants.CASTORE:
case Constants.DASTORE:
case Constants.FASTORE:
case Constants.IASTORE:
case Constants.LASTORE:
case Constants.SASTORE:
break;
case Constants.ARETURN:
case Constants.DRETURN:
case Constants.FRETURN:
case Constants.IRETURN:
case Constants.LRETURN:
case Constants.RETURN:
{
break;
}
// subroutine calls.
case Constants.INVOKESTATIC:
case Constants.INVOKEVIRTUAL:
case Constants.INVOKESPECIAL:
case Constants.INVOKEINTERFACE:
break;
// Throws an exception.
case Constants.ATHROW:
break;
// Opcodes that don't need any modifications. Here for reference
case Constants.ACONST_NULL:
case Constants.ALOAD:
case Constants.ALOAD_0:
case Constants.ALOAD_1:
case Constants.ALOAD_2:
case Constants.ALOAD_3:
case Constants.ASTORE:
case Constants.ASTORE_0:
case Constants.ASTORE_1:
case Constants.ASTORE_2:
case Constants.ASTORE_3:
case Constants.CHECKCAST:
case Constants.D2F: // double to float
case Constants.D2I: // double to integer
case Constants.D2L: // double to long
case Constants.DNEG: // Negate double on top of stack
case Constants.F2D: // float to double
case Constants.F2I: // float to integer
case Constants.F2L: // float to long
case Constants.FNEG: // Negate float on top of stack
case Constants.GOTO:
case Constants.GOTO_W:
case Constants.I2B: // integer to byte
case Constants.I2C: // integer to char
case Constants.I2D: // integer to double
case Constants.I2F: // integer to float
case Constants.I2L: // integer to long
case Constants.I2S: // integer to short
case Constants.IFNONNULL:
case Constants.IFNULL:
case Constants.IINC: // increment local variable by a constant
case Constants.INEG: // negate integer on top of stack
case Constants.JSR: // pushes return address on the stack,
case Constants.JSR_W:
case Constants.L2D: // long to double
case Constants.L2F: // long to float
case Constants.L2I: // long to int
case Constants.LNEG: // negate long on top of stack
case Constants.MONITORENTER:
case Constants.MONITOREXIT:
case Constants.NEW:
case Constants.NOP:
case Constants.RET: // this is the internal JSR return
break;
// Make sure we didn't miss anything
default:
throw new Error("instruction " + inst + " unsupported");
}
}
}
}
return result;
}