Example 1 with LDC
use of org.apache.bcel.generic.LDC in project fb-contrib by mebigfatguy.
the class CopiedOverriddenMethod method codeEquals.
/**
* compares two code blocks to see if they are equal with regard to instructions and field accesses
*
* @param child
* the first code block
* @param parent
* the second code block
*
* @return whether the code blocks are the same
*/
private boolean codeEquals(Code child, Code parent) {
if (parent == null) {
return false;
}
byte[] childBytes = child.getCode();
byte[] parentBytes = parent.getCode();
if ((childBytes == null) || (parentBytes == null)) {
return false;
}
if (childBytes.length != parentBytes.length) {
return false;
}
InstructionHandle[] childihs = new InstructionList(childBytes).getInstructionHandles();
InstructionHandle[] parentihs = new InstructionList(parentBytes).getInstructionHandles();
if (childihs.length != parentihs.length) {
return false;
}
for (int i = 0; i < childihs.length; i++) {
InstructionHandle childih = childihs[i];
InstructionHandle parentih = parentihs[i];
Instruction childin = childih.getInstruction();
Instruction parentin = parentih.getInstruction();
if (!childin.getName().equals(parentin.getName())) {
return false;
}
if (childin instanceof FieldInstruction) {
String childFName = ((FieldInstruction) childin).getFieldName(childPoolGen);
String parentFName = ((FieldInstruction) parentin).getFieldName(parentPoolGen);
if (!childFName.equals(parentFName)) {
return false;
}
String childFSig = ((FieldInstruction) childin).getSignature(childPoolGen);
String parentFSig = ((FieldInstruction) parentin).getSignature(parentPoolGen);
if (!childFSig.equals(parentFSig)) {
return false;
}
if (childFSig.startsWith(Values.SIG_QUALIFIED_CLASS_PREFIX) || childFSig.startsWith(Values.SIG_ARRAY_PREFIX)) {
ReferenceType childRefType = ((FieldInstruction) childin).getReferenceType(childPoolGen);
ReferenceType parentRefType = ((FieldInstruction) parentin).getReferenceType(parentPoolGen);
if (!childRefType.getSignature().equals(parentRefType.getSignature())) {
return false;
}
}
} else if (childin instanceof InvokeInstruction) {
String childClassName = ((InvokeInstruction) childin).getClassName(childPoolGen);
String parentClassName = ((InvokeInstruction) parentin).getClassName(parentPoolGen);
if (!childClassName.equals(parentClassName)) {
return false;
}
String childMethodName = ((InvokeInstruction) childin).getMethodName(childPoolGen);
String parentMethodName = ((InvokeInstruction) parentin).getMethodName(parentPoolGen);
if (!childMethodName.equals(parentMethodName)) {
return false;
}
String childSignature = ((InvokeInstruction) childin).getSignature(childPoolGen);
String parentSignature = ((InvokeInstruction) parentin).getSignature(parentPoolGen);
if (!childSignature.equals(parentSignature)) {
return false;
}
} else if (childin instanceof LDC) {
Type childType = ((LDC) childin).getType(childPoolGen);
Type parentType = ((LDC) parentin).getType(parentPoolGen);
if (!childType.equals(parentType)) {
return false;
}
Object childValue = ((LDC) childin).getValue(childPoolGen);
Object parentValue = ((LDC) parentin).getValue(parentPoolGen);
if (childValue instanceof ConstantClass) {
ConstantClass childClass = (ConstantClass) childValue;
ConstantClass parentClass = (ConstantClass) parentValue;
if (!childClass.getBytes(childPoolGen.getConstantPool()).equals(parentClass.getBytes(parentPoolGen.getConstantPool()))) {
return false;
}
} else if (!childValue.equals(parentValue)) {
return false;
}
// TODO: Other Constant types
} else if (childin instanceof LDC2_W) {
Type childType = ((LDC2_W) childin).getType(childPoolGen);
Type parentType = ((LDC2_W) parentin).getType(parentPoolGen);
if (!childType.equals(parentType)) {
return false;
}
Object childValue = ((LDC2_W) childin).getValue(childPoolGen);
Object parentValue = ((LDC2_W) parentin).getValue(parentPoolGen);
if (!childValue.equals(parentValue)) {
return false;
}
} else {
if (!childin.equals(parentin)) {
return false;
}
}
}
return true;
}
Also used :
InstructionList(org.apache.bcel.generic.InstructionList)
LDC(org.apache.bcel.generic.LDC)
ToString(com.mebigfatguy.fbcontrib.utils.ToString)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
Instruction(org.apache.bcel.generic.Instruction)
FieldInstruction(org.apache.bcel.generic.FieldInstruction)
InstructionHandle(org.apache.bcel.generic.InstructionHandle)
ReferenceType(org.apache.bcel.generic.ReferenceType)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
ReferenceType(org.apache.bcel.generic.ReferenceType)
Type(org.apache.bcel.generic.Type)
BugType(com.mebigfatguy.fbcontrib.utils.BugType)
LDC2_W(org.apache.bcel.generic.LDC2_W)
FieldInstruction(org.apache.bcel.generic.FieldInstruction)
ConstantClass(org.apache.bcel.classfile.ConstantClass)
Example 2 with LDC
use of org.apache.bcel.generic.LDC in project jop by jop-devel.
the class LoopBounds method transfer.
public ContextMap<CallString, Map<Location, ValueMapping>> transfer(InstructionHandle stmt, FlowEdge edge, ContextMap<CallString, Map<Location, ValueMapping>> input, Interpreter<CallString, Map<Location, ValueMapping>> interpreter, Map<InstructionHandle, ContextMap<CallString, Map<Location, ValueMapping>>> state) {
Context context = new Context(input.getContext());
Map<Location, ValueMapping> in = (Map<Location, ValueMapping>) input.get(context.callString);
ContextMap<CallString, Map<Location, ValueMapping>> retval = new ContextMap<CallString, Map<Location, ValueMapping>>(context, new LinkedHashMap<CallString, Map<Location, ValueMapping>>());
Instruction instruction = stmt.getInstruction();
// shortcut for infeasible paths
if (in == null) {
context.stackPtr += instruction.produceStack(context.constPool()) - instruction.consumeStack(context.constPool());
return retval;
}
Map<Location, ValueMapping> result = new LinkedHashMap<Location, ValueMapping>();
retval.put(context.callString, result);
switch(instruction.getOpcode()) {
case Constants.ICONST_M1:
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.BIPUSH:
case Constants.SIPUSH:
{
ConstantPushInstruction instr = (ConstantPushInstruction) instruction;
result = new LinkedHashMap<Location, ValueMapping>(in);
retval.put(context.callString, result);
int value = instr.getValue().intValue();
result.put(new Location(context.stackPtr), new ValueMapping(value));
}
break;
case Constants.ACONST_NULL:
result = in;
retval.put(context.callString, result);
break;
case Constants.LDC:
case Constants.LDC_W:
{
LDC instr = (LDC) instruction;
result = new LinkedHashMap<Location, ValueMapping>(in);
retval.put(context.callString, result);
Type type = instr.getType(context.constPool());
if (type.equals(Type.INT)) {
Integer value = (Integer) instr.getValue(context.constPool());
result.put(new Location(context.stackPtr), new ValueMapping(value));
} else if (type.equals(Type.STRING)) {
String value = (String) instr.getValue(context.constPool());
String name = "char[]";
name += "@" + context.method() + ":" + stmt.getPosition();
result.put(new Location(name + ".length"), new ValueMapping(value.length()));
// System.out.println(name+": \""+value+"\"");
}
}
break;
case Constants.LDC2_W:
result = in;
retval.put(context.callString, result);
break;
case Constants.ISTORE_0:
case Constants.ISTORE_1:
case Constants.ISTORE_2:
case Constants.ISTORE_3:
case Constants.ISTORE:
{
StoreInstruction instr = (StoreInstruction) instruction;
int index = instr.getIndex();
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 1 && l.stackLoc != index) {
result.put(l, in.get(l));
}
if (l.stackLoc == context.stackPtr - 1) {
ValueMapping v = new ValueMapping(in.get(l), true);
if (in.get(l).source == null || in.get(l).source.stackLoc != index) {
v.defscope = ValueMapping.scope;
}
result.put(new Location(index), v);
}
}
}
break;
case Constants.ASTORE_0:
case Constants.ASTORE_1:
case Constants.ASTORE_2:
case Constants.ASTORE_3:
case Constants.ASTORE:
result = in;
retval.put(context.callString, result);
break;
case Constants.LSTORE_0:
case Constants.LSTORE_1:
case Constants.LSTORE_2:
case Constants.LSTORE_3:
case Constants.LSTORE:
// drop top entries to avoid clobbering
filterSet(in, result, context.stackPtr - 2);
break;
case Constants.ILOAD_0:
case Constants.ILOAD_1:
case Constants.ILOAD_2:
case Constants.ILOAD_3:
case Constants.ILOAD:
{
LoadInstruction instr = (LoadInstruction) instruction;
filterSet(in, result, context.stackPtr);
int index = instr.getIndex();
for (Location l : in.keySet()) {
if (l.stackLoc == index) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.source = l;
result.put(new Location(context.stackPtr), m);
}
}
}
break;
case Constants.ALOAD_0:
case Constants.ALOAD_1:
case Constants.ALOAD_2:
case Constants.ALOAD_3:
case Constants.ALOAD:
result = in;
retval.put(context.callString, result);
break;
case Constants.ARRAYLENGTH:
{
filterSet(in, result, context.stackPtr - 1);
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
Location location = new Location(context.stackPtr - 1);
boolean valid = false;
if (receivers == null) {
System.out.println("no receivers at: " + context.callString.toStringList() + context.method() + stmt);
} else {
for (String arrayName : receivers) {
ValueMapping m = in.get(new Location(arrayName + ".length"));
if (m != null) {
ValueMapping value = new ValueMapping(m, false);
value.join(result.get(location));
result.put(location, value);
valid = true;
}
}
}
if (!valid) {
result.put(new Location(context.stackPtr - 1), new ValueMapping());
}
}
break;
case Constants.PUTFIELD:
{
PUTFIELD instr = (PUTFIELD) instruction;
int fieldSize = instr.getFieldType(context.constPool()).getSize();
for (Location l : in.keySet()) {
if (l.stackLoc >= 0 && l.stackLoc < context.stackPtr - 1 - fieldSize) {
result.put(l, in.get(l));
}
}
// System.out.println(context.stackPtr+","+fieldSize+": "+result);
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
if (receivers == null) {
warnNoReceiver(context, stmt);
} else {
for (String fieldName : receivers) {
String f = fieldName.substring(fieldName.lastIndexOf("."), fieldName.length());
String strippedName;
if (fieldName.indexOf("@") >= 0) {
strippedName = fieldName.split("@")[0] + f;
} else {
strippedName = fieldName;
}
if (p.containsField(strippedName)) {
for (Location l : in.keySet()) {
if (l.stackLoc < 0 && !receivers.contains(l.heapLoc)) {
result.put(l, in.get(l));
}
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(fieldName), new ValueMapping(in.get(l), false));
}
}
}
}
}
}
break;
case Constants.GETFIELD:
{
GETFIELD instr = (GETFIELD) instruction;
filterSet(in, result, context.stackPtr - 1);
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
Location location = new Location(context.stackPtr - 1);
boolean valid = false;
if (receivers == null) {
warnNoReceiver(context, stmt);
} else {
for (String fieldName : receivers) {
String f = fieldName.substring(fieldName.lastIndexOf("."), fieldName.length());
String strippedName;
if (fieldName.indexOf("@") >= 0) {
strippedName = fieldName.split("@")[0] + f;
} else {
strippedName = fieldName;
}
if (p.containsField(strippedName)) {
for (Location l : in.keySet()) {
if (l.heapLoc.equals(fieldName)) {
ValueMapping value = new ValueMapping(in.get(l), false);
value.join(result.get(location));
result.put(location, value);
valid = true;
}
}
}
}
}
if (!valid && !(instr.getFieldType(context.constPool()) instanceof ReferenceType)) {
result.put(new Location(context.stackPtr - 1), new ValueMapping());
}
}
break;
case Constants.PUTSTATIC:
{
PUTSTATIC instr = (PUTSTATIC) instruction;
int fieldSize = instr.getFieldType(context.constPool()).getSize();
for (Location l : in.keySet()) {
if (l.stackLoc >= 0 && l.stackLoc < context.stackPtr - fieldSize) {
result.put(l, in.get(l));
}
}
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
for (String fieldName : receivers) {
if (p.containsField(fieldName)) {
for (Location l : in.keySet()) {
if (l.stackLoc < 0 && !receivers.contains(l.heapLoc)) {
result.put(l, in.get(l));
}
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(fieldName), new ValueMapping(in.get(l), false));
}
}
}
}
}
break;
case Constants.GETSTATIC:
{
GETSTATIC instr = (GETSTATIC) instruction;
result = new LinkedHashMap<Location, ValueMapping>(in);
retval.put(context.callString, result);
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
Location location = new Location(context.stackPtr);
boolean valid = false;
for (String fieldName : receivers) {
if (p.containsField(fieldName)) {
for (Location l : in.keySet()) {
if (l.heapLoc.equals(fieldName)) {
ValueMapping value = new ValueMapping(in.get(l), false);
value.join(result.get(location));
result.put(location, value);
valid = true;
}
}
}
}
if (!valid && !(instr.getFieldType(context.constPool()) instanceof ReferenceType)) {
result.put(new Location(context.stackPtr), new ValueMapping());
}
}
break;
case Constants.IASTORE:
case Constants.CASTORE:
case Constants.SASTORE:
case Constants.BASTORE:
{
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 3) {
result.put(l, in.get(l));
}
}
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
if (receivers == null) {
warnNoReceiver(context, stmt);
break;
}
for (String name : receivers) {
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
Location loc = new Location(name);
ValueMapping val = new ValueMapping(in.get(l), false);
val.join(in.get(loc));
result.put(loc, val);
}
}
}
}
break;
case Constants.AASTORE:
{
filterSet(in, result, context.stackPtr - 3);
}
break;
case Constants.IALOAD:
case Constants.CALOAD:
case Constants.SALOAD:
case Constants.BALOAD:
{
filterSet(in, result, context.stackPtr - 2);
DFATool p = interpreter.getDFATool();
Location location = new Location(context.stackPtr - 2);
boolean valid = false;
Set<String> receivers = p.getReceivers(stmt, context.callString);
for (String name : receivers) {
for (Location l : in.keySet()) {
if (l.heapLoc.equals(name)) {
ValueMapping value = new ValueMapping(in.get(l), false);
value.join(result.get(location));
result.put(location, value);
valid = true;
}
}
}
if (!valid) {
result.put(new Location(context.stackPtr - 2), new ValueMapping(0));
}
}
break;
case Constants.AALOAD:
{
ValueMapping v = in.get(new Location(context.stackPtr - 1));
if (v == null) {
logger.warn("no value at: " + context.callString.toStringList() + context.method() + stmt);
} else {
recordArrayIndex(stmt, context, v.assigned);
}
filterSet(in, result, context.stackPtr - 2);
}
break;
case Constants.DUP:
{
for (Location l : in.keySet()) {
result.put(l, in.get(l));
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(context.stackPtr), new ValueMapping(in.get(l), true));
}
}
}
break;
case Constants.DUP_X1:
{
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
}
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(context.stackPtr - 2), new ValueMapping(in.get(l), true));
result.put(new Location(context.stackPtr), new ValueMapping(in.get(l), true));
}
if (l.stackLoc == context.stackPtr - 2) {
result.put(new Location(context.stackPtr - 1), new ValueMapping(in.get(l), true));
}
}
}
break;
case Constants.DUP2:
{
for (Location l : in.keySet()) {
result.put(l, in.get(l));
if (l.stackLoc == context.stackPtr - 2) {
result.put(new Location(context.stackPtr), new ValueMapping(in.get(l), true));
}
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(context.stackPtr + 1), new ValueMapping(in.get(l), true));
}
}
}
break;
case Constants.POP:
{
filterSet(in, result, context.stackPtr - 1);
}
break;
case Constants.POP2:
{
filterSet(in, result, context.stackPtr - 2);
}
break;
case Constants.IINC:
{
IINC instr = (IINC) instruction;
int index = instr.getIndex();
int increment = instr.getIncrement();
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr) {
result.put(l, in.get(l));
}
if (l.stackLoc == index) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.add(increment);
m.constrained.add(increment);
Interval operand = new Interval(increment, increment);
if (m.increment != null && !m.softinc) {
m.increment.join(operand);
} else if (m.increment != null && m.softinc) {
if ((m.increment.getLb() < 0 && operand.getUb() > 0) || (m.increment.getUb() > 0 && operand.getLb() < 0)) {
m.increment.join(operand);
} else {
m.increment = operand;
}
m.softinc = false;
} else {
m.increment = operand;
m.softinc = false;
}
result.put(l, m);
}
}
}
break;
case Constants.IADD:
{
Interval operand = new Interval();
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
operand = in.get(l).assigned;
}
}
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 2) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.add(operand);
m.constrained.add(operand);
if (m.increment != null && !m.softinc) {
m.increment.join(operand);
} else if (m.increment != null && m.softinc) {
if ((m.increment.getLb() < 0 && operand.getUb() > 0) || (m.increment.getUb() > 0 && operand.getLb() < 0)) {
m.increment.join(operand);
} else {
m.increment = operand;
}
m.softinc = false;
} else {
m.increment = operand;
m.softinc = false;
}
result.put(l, m);
}
}
}
break;
case Constants.ISUB:
{
Interval operand = new Interval();
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
operand = in.get(l).assigned;
}
}
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 2) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.sub(operand);
m.constrained.sub(operand);
// decrement rather than increment
operand.neg();
if (m.increment != null && !m.softinc) {
m.increment.join(operand);
} else if (m.increment != null && m.softinc) {
if ((m.increment.getLb() < 0 && operand.getUb() > 0) || (m.increment.getUb() > 0 && operand.getLb() < 0)) {
m.increment.join(operand);
} else {
m.increment = operand;
}
m.softinc = false;
} else {
m.increment = operand;
m.softinc = false;
}
result.put(l, m);
}
}
}
break;
case Constants.INEG:
{
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 1) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 1) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.neg();
m.constrained.neg();
m.increment = new Interval();
result.put(l, m);
}
}
}
break;
case Constants.IUSHR:
{
Interval operand = new Interval();
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
operand = in.get(l).assigned;
}
}
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 2) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.ushr(operand);
m.constrained.ushr(operand);
m.increment = new Interval();
result.put(l, m);
}
}
}
break;
case Constants.ISHR:
{
Interval operand = new Interval();
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
operand = in.get(l).assigned;
}
}
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 2) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.shr(operand);
m.constrained.shr(operand);
m.increment = new Interval();
result.put(l, m);
}
}
}
break;
case Constants.IMUL:
{
Interval operand = new Interval();
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
operand = in.get(l).assigned;
}
}
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 2) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.mul(operand);
m.constrained.mul(operand);
m.increment = new Interval();
result.put(l, m);
}
}
}
break;
case Constants.IDIV:
{
Interval operand = new Interval();
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
operand = in.get(l).assigned;
}
}
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 2) {
ValueMapping m = new ValueMapping(in.get(l), true);
m.assigned.div(operand);
m.constrained.div(operand);
m.increment = new Interval();
result.put(l, m);
}
}
}
break;
case Constants.IAND:
case Constants.IOR:
case Constants.IXOR:
case Constants.IREM:
case Constants.ISHL:
{
// TODO: we could be more clever for some operations
for (Location l : in.keySet()) {
if (l.stackLoc < context.stackPtr - 2) {
result.put(l, in.get(l));
} else if (l.stackLoc == context.stackPtr - 2) {
ValueMapping m = new ValueMapping();
result.put(l, m);
}
}
}
break;
case Constants.I2B:
case Constants.I2C:
case Constants.I2S:
// TODO: is this really correct?
result = in;
retval.put(context.callString, result);
break;
case Constants.MONITORENTER:
result = in;
retval.put(context.callString, result);
context.syncLevel++;
break;
case Constants.MONITOREXIT:
result = in;
retval.put(context.callString, result);
context.syncLevel--;
if (context.syncLevel < 0) {
System.err.println("Synchronization level mismatch.");
System.exit(-1);
}
break;
case Constants.CHECKCAST:
result = in;
retval.put(context.callString, result);
break;
case Constants.INSTANCEOF:
{
filterSet(in, result, context.stackPtr - 1);
ValueMapping bool = new ValueMapping();
bool.assigned.setLb(0);
bool.assigned.setUb(1);
result.put(new Location(context.stackPtr - 1), bool);
}
break;
case Constants.NEW:
{
result = in;
retval.put(context.callString, result);
}
break;
case Constants.NEWARRAY:
{
NEWARRAY instr = (NEWARRAY) instruction;
String name = instr.getType().toString();
name += "@" + context.method() + ":" + stmt.getPosition();
filterSet(in, result, context.stackPtr - 1);
boolean valid = false;
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(name + ".length"), in.get(l));
recordSize(stmt, context, in.get(l).assigned);
valid = true;
}
}
if (!valid) {
ValueMapping v = new ValueMapping();
result.put(new Location(name + ".length"), v);
recordSize(stmt, context, v.assigned);
}
}
break;
case Constants.ANEWARRAY:
{
ANEWARRAY instr = (ANEWARRAY) instruction;
String name = instr.getType(context.constPool()).toString() + "[]";
name += "@" + context.method() + ":" + stmt.getPosition();
// System.out.println("NEW ARRAY: "+name);
filterSet(in, result, context.stackPtr - 1);
boolean valid = false;
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(name + ".length"), in.get(l));
recordSize(stmt, context, in.get(l).assigned);
valid = true;
}
}
if (!valid) {
ValueMapping v = new ValueMapping();
result.put(new Location(name + ".length"), v);
recordSize(stmt, context, v.assigned);
}
}
break;
case Constants.MULTIANEWARRAY:
{
MULTIANEWARRAY instr = (MULTIANEWARRAY) instruction;
int dim = instr.getDimensions();
filterSet(in, result, context.stackPtr - dim);
String type = instr.getType(context.constPool()).toString();
type = type.substring(0, type.indexOf("["));
Interval[] size = new Interval[dim];
for (int i = 1; i <= dim; i++) {
String name = type;
for (int k = 0; k < i; k++) {
name += "[]";
}
name += "@" + context.method() + ":" + stmt.getPosition();
boolean valid = false;
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - i) {
result.put(new Location(name + ".length"), in.get(l));
if (size[i - 1] != null) {
size[i - 1].join(in.get(l).assigned);
} else {
size[i - 1] = in.get(l).assigned;
}
valid = true;
}
}
if (!valid) {
ValueMapping v = new ValueMapping();
result.put(new Location(name + ".length"), v);
size[i - 1] = v.assigned;
}
}
recordSize(stmt, context, size);
}
break;
case Constants.GOTO:
result = in;
retval.put(context.callString, result);
break;
case Constants.IFNULL:
case Constants.IFNONNULL:
{
checkScope(context, stmt);
filterSet(in, result, context.stackPtr - 1);
}
break;
case Constants.IF_ACMPEQ:
case Constants.IF_ACMPNE:
{
checkScope(context, stmt);
filterSet(in, result, context.stackPtr - 2);
}
break;
case Constants.IFEQ:
case Constants.IFNE:
case Constants.IFLT:
case Constants.IFGE:
case Constants.IFLE:
case Constants.IFGT:
checkScope(context, stmt);
result = doIf(stmt, edge, context, in, result);
retval.put(context.callString, result);
break;
case Constants.IF_ICMPEQ:
case Constants.IF_ICMPNE:
case Constants.IF_ICMPLT:
case Constants.IF_ICMPGE:
case Constants.IF_ICMPGT:
case Constants.IF_ICMPLE:
checkScope(context, stmt);
result = doIfIcmp(stmt, edge, context, in, result);
retval.put(context.callString, result);
break;
case Constants.LOOKUPSWITCH:
case Constants.TABLESWITCH:
result = in;
retval.put(context.callString, result);
break;
case Constants.INVOKEVIRTUAL:
case Constants.INVOKEINTERFACE:
case Constants.INVOKESTATIC:
case Constants.INVOKESPECIAL:
{
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
if (receivers == null) {
warnUnknownReceivers(context, stmt);
result = in;
break;
}
for (String methodName : receivers) {
doInvoke(methodName, stmt, context, input, interpreter, state, retval);
}
}
break;
case Constants.ARETURN:
case Constants.RETURN:
{
filterSet(in, result, 0);
}
break;
case Constants.IRETURN:
{
filterSet(in, result, 0);
for (Location l : in.keySet()) {
if (l.stackLoc == context.stackPtr - 1) {
result.put(new Location(0), new ValueMapping(in.get(l), false));
}
}
}
break;
default:
// System.out.println("unknown instruction: "+stmt);
result = in;
retval.put(context.callString, result);
break;
}
// System.out.println(stmt);
// System.out.print(stmt.getInstruction()+":\t{ ");
// if (retval != null) {
// for (Iterator<Map<Location, ValueMapping>> k = retval.values().iterator(); k.hasNext(); ) {
// Map<Location, ValueMapping> m = k.next();
// System.out.print(m+", ");
// }
// }
// System.out.println("}");
context.stackPtr += instruction.produceStack(context.constPool()) - instruction.consumeStack(context.constPool());
return retval;
}
Also used :
Set(java.util.Set)
LinkedHashSet(java.util.LinkedHashSet)
MULTIANEWARRAY(org.apache.bcel.generic.MULTIANEWARRAY)
ANEWARRAY(org.apache.bcel.generic.ANEWARRAY)
LDC(org.apache.bcel.generic.LDC)
CallString(com.jopdesign.common.code.CallString)
LoadInstruction(org.apache.bcel.generic.LoadInstruction)
StoreInstruction(org.apache.bcel.generic.StoreInstruction)
Instruction(org.apache.bcel.generic.Instruction)
ConstantPushInstruction(org.apache.bcel.generic.ConstantPushInstruction)
BranchInstruction(org.apache.bcel.generic.BranchInstruction)
ReferenceType(org.apache.bcel.generic.ReferenceType)
LinkedHashMap(java.util.LinkedHashMap)
PUTSTATIC(org.apache.bcel.generic.PUTSTATIC)
LoadInstruction(org.apache.bcel.generic.LoadInstruction)
Context(com.jopdesign.dfa.framework.Context)
MULTIANEWARRAY(org.apache.bcel.generic.MULTIANEWARRAY)
ANEWARRAY(org.apache.bcel.generic.ANEWARRAY)
NEWARRAY(org.apache.bcel.generic.NEWARRAY)
DFATool(com.jopdesign.dfa.DFATool)
PUTFIELD(org.apache.bcel.generic.PUTFIELD)
MULTIANEWARRAY(org.apache.bcel.generic.MULTIANEWARRAY)
ContextMap(com.jopdesign.dfa.framework.ContextMap)
CallString(com.jopdesign.common.code.CallString)
GETFIELD(org.apache.bcel.generic.GETFIELD)
ReferenceType(org.apache.bcel.generic.ReferenceType)
Type(org.apache.bcel.generic.Type)
IINC(org.apache.bcel.generic.IINC)
ConstantPushInstruction(org.apache.bcel.generic.ConstantPushInstruction)
GETSTATIC(org.apache.bcel.generic.GETSTATIC)
Map(java.util.Map)
LinkedHashMap(java.util.LinkedHashMap)
ContextMap(com.jopdesign.dfa.framework.ContextMap)
StoreInstruction(org.apache.bcel.generic.StoreInstruction)
Example 3 with LDC
use of org.apache.bcel.generic.LDC in project jop by jop-devel.
the class SymbolicPointsTo method transfer.
public ContextMap<CallString, SymbolicAddressMap> transfer(InstructionHandle stmt, FlowEdge edge, ContextMap<CallString, SymbolicAddressMap> input, Interpreter<CallString, SymbolicAddressMap> interpreter, Map<InstructionHandle, ContextMap<CallString, SymbolicAddressMap>> state) {
Context context = new Context(input.getContext());
if (DEBUG_PRINT) {
System.out.println("[S] " + context.callString.toStringList() + ": " + context.method() + " / " + stmt);
}
SymbolicAddressMap in = input.get(context.callString);
ContextMap<CallString, SymbolicAddressMap> retval = new ContextMap<CallString, SymbolicAddressMap>(context, input);
Instruction instruction = stmt.getInstruction();
int newStackPtr = context.stackPtr + instruction.produceStack(context.constPool()) - instruction.consumeStack(context.constPool());
int opcode = instruction.getOpcode();
switch(opcode) {
/* Constants (boring) */
case Constants.DCONST_0:
case Constants.DCONST_1:
case Constants.LCONST_0:
case Constants.LCONST_1:
/* Instructions above need two stack slots */
case Constants.FCONST_0:
case Constants.FCONST_1:
case Constants.FCONST_2:
case Constants.ICONST_M1:
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.BIPUSH:
case Constants.SIPUSH:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.ACONST_NULL:
{
// Null -> No reference
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
result.putStack(newStackPtr - 1, bsFactory.empty());
retval.put(context.callString, result);
}
break;
/* Long/Double Constants */
case Constants.LDC2_W:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
/* Int/Float/String Constants */
case Constants.LDC:
case Constants.LDC_W:
{
LDC ldc = (LDC) instruction;
Type t = ldc.getType(context.constPool());
if (t instanceof ReferenceType) {
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
/* FIXME: This is overly conservative, but class pointer not available here */
String classContext = context.getMethodInfo().getMemberID().toString();
SymbolicAddress addr = SymbolicAddress.stringLiteral(classContext, ldc.getIndex());
result.putStack(newStackPtr - 1, bsFactory.singleton(addr));
retval.put(context.callString, result);
} else {
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
}
break;
case Constants.DSTORE:
case Constants.DSTORE_0:
case Constants.DSTORE_1:
case Constants.DSTORE_2:
case Constants.DSTORE_3:
case Constants.LSTORE:
case Constants.LSTORE_0:
case Constants.LSTORE_1:
case Constants.LSTORE_2:
case Constants.LSTORE_3:
case Constants.FSTORE:
case Constants.FSTORE_0:
case Constants.FSTORE_1:
case Constants.FSTORE_2:
case Constants.FSTORE_3:
case Constants.ISTORE_0:
case Constants.ISTORE_1:
case Constants.ISTORE_2:
case Constants.ISTORE_3:
case Constants.ISTORE:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
//
case Constants.ASTORE_0:
case Constants.ASTORE_1:
case Constants.ASTORE_2:
case Constants.ASTORE_3:
case Constants.ASTORE:
{
// copy value to local variable
StoreInstruction instr = (StoreInstruction) instruction;
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
if (DEBUG_PRINT) {
System.out.println(String.format("[DD] Copy: stack[%d] <- stack[%d]", instr.getIndex(), context.stackPtr - 1));
}
result.copyStack(in, instr.getIndex(), context.stackPtr - 1);
retval.put(context.callString, result);
}
break;
/* Load variables (boring) */
case Constants.DLOAD_0:
case Constants.DLOAD_1:
case Constants.DLOAD_2:
case Constants.DLOAD_3:
case Constants.DLOAD:
case Constants.LLOAD_0:
case Constants.LLOAD_1:
case Constants.LLOAD_2:
case Constants.LLOAD_3:
case Constants.LLOAD:
/* Instructions above need two stack slots */
case Constants.FLOAD_0:
case Constants.FLOAD_1:
case Constants.FLOAD_2:
case Constants.FLOAD_3:
case Constants.FLOAD:
case Constants.ILOAD_0:
case Constants.ILOAD_1:
case Constants.ILOAD_2:
case Constants.ILOAD_3:
case Constants.ILOAD:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
/* Floating Point Comparison (boring) */
case Constants.DCMPG:
case Constants.DCMPL:
case Constants.LCMP:
/* Instructions above need two stack slots */
case Constants.FCMPG:
case Constants.FCMPL:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.ALOAD_0:
case Constants.ALOAD_1:
case Constants.ALOAD_2:
case Constants.ALOAD_3:
case Constants.ALOAD:
{
LoadInstruction instr = (LoadInstruction) instruction;
// copy value from local variable
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
result.copyStack(in, context.stackPtr, instr.getIndex());
retval.put(context.callString, result);
}
break;
// Access Object Handle (area), top of stack
case Constants.ARRAYLENGTH:
{
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - 1));
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
// Access Object Handle, second on stack
case Constants.PUTFIELD:
{
PUTFIELD instr = (PUTFIELD) instruction;
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - 1 - instr.getType(context.constPool()).getSize()));
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
// Change alias information
if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
String ty = instr.getFieldType(context.constPool()).getSignature();
result.addAlias(ty, in.getStack(context.stackPtr - 1));
}
retval.put(context.callString, result);
}
break;
// Access Object Handle, top of stack
case Constants.GETFIELD:
{
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - 1));
GETFIELD instr = (GETFIELD) instruction;
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
BoundedSet<SymbolicAddress> newMapping = SymbolicAddress.fieldAccess(bsFactory, in.getStack(context.stackPtr - 1), instr.getFieldName(context.constPool()));
newMapping.addAll(in.getAliases(instr.getFieldType(context.constPool()).getSignature()));
result.putStack(context.stackPtr - 1, newMapping);
}
retval.put(context.callString, result);
}
break;
// Handles the same way as MOV
case Constants.PUTSTATIC:
{
PUTSTATIC instr = (PUTSTATIC) instruction;
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
BoundedSet<SymbolicAddress> pointers = in.getStack(context.stackPtr - 1);
result.putHeap(fieldSignature(context, instr), pointers);
}
retval.put(context.callString, result);
}
break;
// Handled the same as MOV
case Constants.GETSTATIC:
{
GETSTATIC instr = (GETSTATIC) instruction;
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
result.putStack(context.stackPtr, in.getHeap(fieldSignature(context, instr)));
}
retval.put(context.callString, result);
}
break;
case Constants.LASTORE:
case Constants.DASTORE:
case Constants.IASTORE:
case Constants.FASTORE:
case Constants.CASTORE:
case Constants.SASTORE:
case Constants.BASTORE:
{
int offset = 3;
if (opcode == Constants.LASTORE || opcode == Constants.DASTORE)
offset = 4;
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - offset));
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
// changing the heap -> TOP
case Constants.AASTORE:
{
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - 3));
AASTORE instr = (AASTORE) stmt.getInstruction();
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
// Change alias information
if (instr.getType(context.constPool()) instanceof ReferenceType) {
String ty = instr.getType(context.constPool()).getSignature();
result.addAlias(ty, in.getStack(context.stackPtr - 1));
}
retval.put(context.callString, result);
}
break;
case Constants.DALOAD:
case Constants.LALOAD:
case Constants.IALOAD:
case Constants.FALOAD:
case Constants.CALOAD:
case Constants.SALOAD:
case Constants.BALOAD:
{
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - 2));
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
// TODO: Use index info
case Constants.AALOAD:
{
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - 2));
// AALOAD instr = (AALOAD)instruction;
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
BoundedSet<SymbolicAddress> objectMapping = in.getStack(context.stackPtr - 2);
BoundedSet<SymbolicAddress> newMapping;
LoopBounds bounds = interpreter.getDFATool().getLoopBounds();
if (executedOnce.query(stmt)) {
newMapping = bsFactory.singleton(SymbolicAddress.newName());
} else if (objectMapping.isSaturated() || bounds == null) {
newMapping = bsFactory.top();
} else {
Interval interval = bounds.getArrayIndices(stmt, context.callString);
if (interval.hasLb() && interval.hasUb()) {
newMapping = bsFactory.empty();
for (SymbolicAddress addr : objectMapping.getSet()) {
for (int i = interval.getLb(); i <= interval.getUb(); i++) {
newMapping.add(addr.accessArray(i));
}
}
} else {
newMapping = bsFactory.top();
}
}
// Doesn't work, but is probably stupid anyway :(
// LoopBounds bounds = interpreter.getDFATool().getLoopBounds();
// bounds.getArraySizes().get(stmt).get(context.callString);
// newMapping = bsFactory.empty();
// Interval[] sizeBounds = { new Interval(2,3) };
// for(Interval i : sizeBounds) {
// if(! i.hasUb()) {
// newMapping = bsFactory.top();
// }
// int ub = i.getUb();
// for(int j = 0; j <= ub; j++) {
// for(SymbolicAddress addr: objectMapping.getSet()) {
// newMapping.add(addr.accessArray(j));
// }
// }
// }
// }
result.putStack(context.stackPtr - 2, newMapping);
retval.put(context.callString, result);
}
break;
case Constants.DUP:
{
// copy value on stack
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
result.copyStack(in, context.stackPtr, context.stackPtr - 1);
retval.put(context.callString, result);
}
break;
case Constants.DUP_X1:
{
// copy value on stack
SymbolicAddressMap result = in.cloneFilterStack(context.stackPtr - 2);
result.copyStack(in, context.stackPtr - 2, context.stackPtr - 1);
result.copyStack(in, context.stackPtr - 1, context.stackPtr - 2);
result.copyStack(in, context.stackPtr, context.stackPtr - 1);
retval.put(context.callString, result);
}
break;
case Constants.DUP_X2:
{
// copy value on stack
SymbolicAddressMap result = in.cloneFilterStack(context.stackPtr - 3);
result.copyStack(in, context.stackPtr - 3, context.stackPtr - 1);
result.copyStack(in, context.stackPtr - 2, context.stackPtr - 3);
result.copyStack(in, context.stackPtr - 1, context.stackPtr - 2);
result.copyStack(in, context.stackPtr, context.stackPtr - 1);
retval.put(context.callString, result);
}
break;
case Constants.DUP2:
{
// v1,v2 -> v1,v2,v1,v2
SymbolicAddressMap result = in.cloneFilterStack(context.stackPtr);
result.copyStack(in, context.stackPtr, context.stackPtr - 2);
result.copyStack(in, context.stackPtr + 1, context.stackPtr - 1);
retval.put(context.callString, result);
}
break;
case Constants.POP:
case Constants.POP2:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.IINC:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.IADD:
case Constants.ISUB:
case Constants.INEG:
case Constants.IUSHR:
case Constants.ISHR:
case Constants.IAND:
case Constants.IOR:
case Constants.IXOR:
case Constants.IMUL:
case Constants.IDIV:
case Constants.IREM:
case Constants.ISHL:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
/* Long,Float and Double operations (boring) */
case Constants.DADD:
case Constants.DSUB:
case Constants.DMUL:
case Constants.DDIV:
case Constants.DREM:
case Constants.LADD:
case Constants.LSUB:
case Constants.LUSHR:
case Constants.LSHR:
case Constants.LAND:
case Constants.LOR:
case Constants.LXOR:
case Constants.LMUL:
case Constants.LDIV:
case Constants.LREM:
case Constants.LSHL:
/* Instructions above need two stack slots */
case Constants.DNEG:
case Constants.LNEG:
case Constants.FADD:
case Constants.FSUB:
case Constants.FNEG:
case Constants.FMUL:
case Constants.FDIV:
case Constants.FREM:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
/* Conversion of primitives (boring) */
case Constants.D2F:
case Constants.D2I:
/* Instructions above need two stack slots */
case Constants.D2L:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.L2F:
case Constants.L2I:
/* Instructions above need two stack slots */
case Constants.L2D:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.F2D:
case Constants.I2D:
case Constants.F2L:
case Constants.I2L:
/* Instructions above need one stack slot less */
case Constants.F2I:
case Constants.I2B:
case Constants.I2C:
case Constants.I2F:
case Constants.I2S:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.MONITORENTER:
// not supported yet
if (ASSUME_NO_CONC)
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
else
retval.put(context.callString, SymbolicAddressMap.top());
break;
case Constants.MONITOREXIT:
// not supported yet
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
break;
case Constants.CHECKCAST:
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
break;
case Constants.INSTANCEOF:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.NEW:
case Constants.NEWARRAY:
case Constants.ANEWARRAY:
{
SymbolicAddressMap result = in.cloneFilterStack(newStackPtr);
BoundedSet<SymbolicAddress> newMapping;
if (executedOnce.query(stmt)) {
newMapping = bsFactory.singleton(SymbolicAddress.newName());
} else {
newMapping = bsFactory.top();
}
int objPtr = (instruction.getOpcode() == Constants.NEW) ? context.stackPtr : (context.stackPtr - 1);
result.putStack(objPtr, newMapping);
retval.put(context.callString, result);
}
break;
case Constants.MULTIANEWARRAY:
{
// not supported yet
retval.put(context.callString, SymbolicAddressMap.top());
}
break;
case Constants.GOTO:
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
break;
case Constants.IFNULL:
case Constants.IFNONNULL:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.IF_ACMPEQ:
case Constants.IF_ACMPNE:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
case Constants.IFEQ:
case Constants.IFNE:
case Constants.IFLT:
case Constants.IFGE:
case Constants.IFLE:
case Constants.IFGT:
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
break;
case Constants.IF_ICMPEQ:
case Constants.IF_ICMPNE:
case Constants.IF_ICMPLT:
case Constants.IF_ICMPGE:
case Constants.IF_ICMPGT:
case Constants.IF_ICMPLE:
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
break;
case Constants.LOOKUPSWITCH:
case Constants.TABLESWITCH:
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
break;
case Constants.INVOKEVIRTUAL:
case Constants.INVOKEINTERFACE:
case Constants.INVOKESTATIC:
case Constants.INVOKESPECIAL:
{
DFATool p = interpreter.getDFATool();
Set<String> receivers = p.getReceivers(stmt, context.callString);
retval.put(context.callString, new SymbolicAddressMap(bsFactory));
if (receivers == null || receivers.size() == 0) {
String errMsg = String.format("%s : invoke %s: %s receivers", context.method(), instruction.toString(context.constPool().getConstantPool()), (receivers == null ? "Unknown" : "No"));
// Get static receivers (FIXME: this just workarounds DFA bugs)
if (opcode == Constants.INVOKESTATIC) {
receivers = new HashSet<String>();
InvokeInstruction invInstruction = (InvokeInstruction) instruction;
String klass = invInstruction.getClassName(context.constPool());
String name = invInstruction.getMethodName(context.constPool());
String sig = invInstruction.getSignature(context.constPool());
String recv = klass + "." + name + sig;
Logger.getLogger(this.getClass()).info("Using static receiver: " + recv);
receivers.add(recv);
} else {
Logger.getLogger(this.getClass()).error(errMsg);
throw new AssertionError(errMsg);
}
}
if (instruction.getOpcode() == Constants.INVOKEVIRTUAL || instruction.getOpcode() == Constants.INVOKEINTERFACE) {
MethodInfo mi = p.getMethod(receivers.iterator().next());
int refPos = MethodHelper.getArgSize(mi);
// mi.methodId,refPos,context.stackPtr,input.get(context.callString)));
try {
putResult(stmt, context, input.get(context.callString).getStack(context.stackPtr - refPos));
} catch (Error e) {
System.err.println("We have problems with method " + mi);
System.err.println(e.getMessage());
}
}
for (String methodName : receivers) {
doInvoke(methodName, stmt, context, input, interpreter, state, retval);
}
}
break;
case Constants.ARETURN:
{
SymbolicAddressMap result = in.cloneFilterStack(0);
// store results
result.copyStack(in, 0, context.stackPtr - 1);
retval.put(context.callString, result);
}
break;
/* The values of other return statements are not of interest here */
case Constants.DRETURN:
case Constants.LRETURN:
case Constants.FRETURN:
case Constants.IRETURN:
case Constants.RETURN:
{
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
}
break;
default:
System.err.println("unknown instruction: " + stmt + " in method " + context.method());
retval.put(context.callString, in.cloneFilterStack(newStackPtr));
break;
}
// DEBUGGING
if (DEBUG_PRINT) {
System.out.println("[F] " + context.method() + " / " + stmt);
System.out.println(" Stackptr: " + context.stackPtr + " -> " + newStackPtr);
System.out.println(" Before: ");
input.get(context.callString).print(System.out, 4);
System.out.println(" After: ");
retval.get(context.callString).print(System.out, 4);
}
context.stackPtr = newStackPtr;
return retval;
}
Also used :
HashSet(java.util.HashSet)
Set(java.util.Set)
BoundedSet(com.jopdesign.dfa.framework.BoundedSetFactory.BoundedSet)
LDC(org.apache.bcel.generic.LDC)
CallString(com.jopdesign.common.code.CallString)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
ArrayInstruction(org.apache.bcel.generic.ArrayInstruction)
LoadInstruction(org.apache.bcel.generic.LoadInstruction)
StoreInstruction(org.apache.bcel.generic.StoreInstruction)
Instruction(org.apache.bcel.generic.Instruction)
FieldInstruction(org.apache.bcel.generic.FieldInstruction)
ReferenceType(org.apache.bcel.generic.ReferenceType)
PUTSTATIC(org.apache.bcel.generic.PUTSTATIC)
LoadInstruction(org.apache.bcel.generic.LoadInstruction)
HashSet(java.util.HashSet)
Context(com.jopdesign.dfa.framework.Context)
DFATool(com.jopdesign.dfa.DFATool)
PUTFIELD(org.apache.bcel.generic.PUTFIELD)
AppInfoError(com.jopdesign.common.misc.AppInfoError)
ContextMap(com.jopdesign.dfa.framework.ContextMap)
CallString(com.jopdesign.common.code.CallString)
GETFIELD(org.apache.bcel.generic.GETFIELD)
BoundedSet(com.jopdesign.dfa.framework.BoundedSetFactory.BoundedSet)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
ReferenceType(org.apache.bcel.generic.ReferenceType)
Type(org.apache.bcel.generic.Type)
AASTORE(org.apache.bcel.generic.AASTORE)
MethodInfo(com.jopdesign.common.MethodInfo)
GETSTATIC(org.apache.bcel.generic.GETSTATIC)
StoreInstruction(org.apache.bcel.generic.StoreInstruction)
Example 4 with LDC
use of org.apache.bcel.generic.LDC in project jop by jop-devel.
the class CallStringReceiverTypes method transfer.
public ContextMap<CallString, Set<TypeMapping>> transfer(InstructionHandle stmt, FlowEdge edge, ContextMap<CallString, Set<TypeMapping>> input, Interpreter<CallString, Set<TypeMapping>> interpreter, Map<InstructionHandle, ContextMap<CallString, Set<TypeMapping>>> state) {
Context context = new Context(input.getContext());
Set<TypeMapping> in = input.get(context.callString);
ContextMap<CallString, Set<TypeMapping>> retval = new ContextMap<CallString, Set<TypeMapping>>(context, new LinkedHashMap<CallString, Set<TypeMapping>>());
Set<TypeMapping> result = new LinkedHashSet<TypeMapping>();
retval.put(context.callString, result);
Instruction instruction = stmt.getInstruction();
switch(instruction.getOpcode()) {
case Constants.NOP:
result = in;
retval.put(context.callString, result);
break;
case Constants.ACONST_NULL:
case Constants.ICONST_M1:
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.BIPUSH:
case Constants.SIPUSH:
case Constants.FCONST_0:
case Constants.FCONST_1:
case Constants.FCONST_2:
case Constants.LCONST_0:
case Constants.LCONST_1:
case Constants.DCONST_0:
case Constants.DCONST_1:
case Constants.LDC2_W:
result = in;
retval.put(context.callString, result);
break;
case Constants.LDC:
case Constants.LDC_W:
{
LDC instr = (LDC) instruction;
result = new LinkedHashSet<TypeMapping>(in);
retval.put(context.callString, result);
Type type = instr.getType(context.constPool());
if (type.equals(Type.STRING)) {
result.add(new TypeMapping(context.stackPtr, type.toString()));
String value = type.toString() + ".value";
String name = "char[]";
name += "@" + context.method() + ":" + stmt.getPosition();
result.add(new TypeMapping(value, name));
}
}
break;
case Constants.DUP:
{
for (TypeMapping m : in) {
result.add(m);
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(context.stackPtr, m.type));
}
}
}
break;
case Constants.DUP_X1:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 2) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(context.stackPtr - 2, m.type));
result.add(new TypeMapping(context.stackPtr, m.type));
}
if (m.stackLoc == context.stackPtr - 2) {
result.add(new TypeMapping(context.stackPtr - 1, m.type));
}
}
}
break;
case Constants.DUP_X2:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 3) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(context.stackPtr - 3, m.type));
result.add(new TypeMapping(context.stackPtr, m.type));
}
if (m.stackLoc == context.stackPtr - 2) {
result.add(new TypeMapping(context.stackPtr - 1, m.type));
}
if (m.stackLoc == context.stackPtr - 3) {
result.add(new TypeMapping(context.stackPtr - 2, m.type));
}
}
}
break;
case Constants.DUP2:
{
for (TypeMapping m : in) {
result.add(m);
if (m.stackLoc == context.stackPtr - 2) {
result.add(new TypeMapping(context.stackPtr, m.type));
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(context.stackPtr + 1, m.type));
}
}
}
break;
case Constants.DUP2_X1:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 3) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 2) {
result.add(new TypeMapping(context.stackPtr - 3, m.type));
result.add(new TypeMapping(context.stackPtr, m.type));
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(context.stackPtr - 2, m.type));
result.add(new TypeMapping(context.stackPtr + 1, m.type));
}
if (m.stackLoc == context.stackPtr - 3) {
result.add(new TypeMapping(context.stackPtr - 1, m.type));
}
}
}
break;
case Constants.DUP2_X2:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 3) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 2) {
result.add(new TypeMapping(context.stackPtr - 4, m.type));
result.add(new TypeMapping(context.stackPtr, m.type));
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(context.stackPtr - 3, m.type));
result.add(new TypeMapping(context.stackPtr + 1, m.type));
}
if (m.stackLoc == context.stackPtr - 4) {
result.add(new TypeMapping(context.stackPtr - 2, m.type));
}
if (m.stackLoc == context.stackPtr - 3) {
result.add(new TypeMapping(context.stackPtr - 1, m.type));
}
}
}
break;
case Constants.SWAP:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 2) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 2) {
result.add(new TypeMapping(context.stackPtr - 1, m.type));
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(context.stackPtr - 2, m.type));
}
}
}
break;
case Constants.POP:
filterSet(in, result, context.stackPtr - 1);
break;
case Constants.POP2:
filterSet(in, result, context.stackPtr - 2);
break;
case Constants.GETFIELD:
{
GETFIELD instr = (GETFIELD) instruction;
List<String> receivers = new LinkedList<String>();
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 1) {
result.add(m);
} else if (m.stackLoc == context.stackPtr - 1) {
receivers.add(m.type);
}
}
// if (receivers.isEmpty()
// && instr.getFieldType(context.constPool) != Type.INT) {
// System.out.println("GETFIELD not found: "+context.method+"@"+stmt+": "+instr.getFieldName(context.constPool));
// // System.exit(1);
// }
DFATool p = interpreter.getDFATool();
String fieldName = instr.getFieldName(context.constPool());
for (String receiver : receivers) {
// String heapLoc = receiver + "." + instr.getFieldName(context.constPool);
// String namedLoc = receiver.split("@")[0] + "." + instr.getFieldName(context.constPool);
String className = receiver.split("@")[0];
ClassInfo classInfo = p.classForField(className, fieldName);
if (classInfo != null) {
String heapLoc = classInfo.getClassName() + "." + fieldName;
recordReceiver(stmt, context, heapLoc);
for (TypeMapping m : in) {
if (heapLoc.equals(m.heapLoc)) {
result.add(new TypeMapping(context.stackPtr - 1, m.type));
}
}
}
}
}
break;
case Constants.PUTFIELD:
{
PUTFIELD instr = (PUTFIELD) instruction;
List<String> receivers = new LinkedList<String>();
int fieldSize = instr.getFieldType(context.constPool()).getSize();
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 1 - fieldSize) {
result.add(m);
} else if (m.stackLoc == context.stackPtr - 1 - fieldSize) {
receivers.add(m.type);
}
}
// if (receivers.isEmpty()) {
// System.out.println("PUTFIELD not found: "+context.method+"@"+stmt+": "+instr.getFieldName(context.constPool));
// // System.exit(-1);
// }
DFATool p = interpreter.getDFATool();
String fieldName = instr.getFieldName(context.constPool());
for (String receiver : receivers) {
// String heapLoc = receiver + "." + instr.getFieldName(context.constPool);
// String namedLoc = receiver.split("@")[0] + "." + instr.getFieldName(context.constPool);
String className = receiver.split("@")[0];
ClassInfo classInfo = p.classForField(className, fieldName);
if (classInfo != null) {
String heapLoc = classInfo.getClassName() + "." + fieldName;
recordReceiver(stmt, context, heapLoc);
for (TypeMapping m : in) {
if (!heapLoc.equals(m.heapLoc) || context.threaded) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(heapLoc, m.type));
}
}
}
}
if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
doInvokeStatic("com.jopdesign.sys.JVM.f_putfield_ref(III)V", stmt, context, input, interpreter, state, retval);
}
}
break;
case Constants.GETSTATIC:
{
GETSTATIC instr = (GETSTATIC) instruction;
DFATool p = interpreter.getDFATool();
FieldRef ref = context.getMethodInfo().getCode().getFieldRef(instr);
String fieldName = ref.getName();
String className = ref.getClassName();
ClassInfo classInfo = p.classForField(className, fieldName);
if (classInfo != null) {
String heapLoc = classInfo.getClassName() + "." + fieldName;
recordReceiver(stmt, context, heapLoc);
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr) {
result.add(m);
}
if (heapLoc.equals(m.heapLoc)) {
result.add(new TypeMapping(context.stackPtr, m.type));
}
}
} else {
// System.out.println("GETSTATIC not found: "+heapLoc);
// System.exit(1);
}
}
break;
case Constants.PUTSTATIC:
{
PUTSTATIC instr = (PUTSTATIC) instruction;
DFATool p = interpreter.getDFATool();
FieldRef ref = context.getMethodInfo().getCode().getFieldRef(instr);
String fieldName = ref.getName();
String className = ref.getClassName();
ClassInfo classInfo = p.classForField(className, fieldName);
if (classInfo != null) {
String heapLoc = classInfo.getClassName() + "." + fieldName;
recordReceiver(stmt, context, heapLoc);
for (TypeMapping m : in) {
if (m.stackLoc >= 0 && m.stackLoc < context.stackPtr - 1) {
result.add(m);
} else if (m.stackLoc == -1 && (!heapLoc.equals(m.heapLoc) || context.threaded)) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(heapLoc, m.type));
}
}
} else {
// System.out.println("PUTSTATIC not found: "+heapLoc);
// System.exit(1);
}
if (instr.getFieldType(context.constPool()) instanceof ReferenceType) {
doInvokeStatic("com.jopdesign.sys.JVM.f_putstatic_ref(II)V", stmt, context, input, interpreter, state, retval);
}
}
break;
case Constants.ARRAYLENGTH:
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 1) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
recordReceiver(stmt, context, m.type);
}
}
break;
case Constants.IASTORE:
case Constants.BASTORE:
case Constants.CASTORE:
case Constants.SASTORE:
case Constants.FASTORE:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 3) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 3) {
recordReceiver(stmt, context, m.type);
}
}
}
break;
case Constants.LASTORE:
case Constants.DASTORE:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 4) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 4) {
recordReceiver(stmt, context, m.type);
}
}
}
break;
case Constants.AASTORE:
{
List<String> receivers = new LinkedList<String>();
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 3) {
result.add(m);
} else if (m.stackLoc == context.stackPtr - 3) {
receivers.add(m.type);
recordReceiver(stmt, context, m.type);
}
}
for (String healLoc : receivers) {
for (TypeMapping m : in) {
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(healLoc, m.type));
}
}
}
doInvokeStatic("com.jopdesign.sys.JVM.f_aastore(III)V", stmt, context, input, interpreter, state, retval);
}
break;
case Constants.IALOAD:
case Constants.BALOAD:
case Constants.CALOAD:
case Constants.SALOAD:
case Constants.FALOAD:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 2) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 2) {
recordReceiver(stmt, context, m.type);
}
}
}
break;
case Constants.LALOAD:
case Constants.DALOAD:
{
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 2) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 2) {
recordReceiver(stmt, context, m.type);
}
}
}
break;
case Constants.AALOAD:
{
List<String> receivers = new LinkedList<String>();
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 2) {
result.add(m);
} else if (m.stackLoc == context.stackPtr - 2) {
receivers.add(m.type);
recordReceiver(stmt, context, m.type);
}
}
for (String heapLoc : receivers) {
for (TypeMapping m : in) {
if (heapLoc.equals(m.heapLoc)) {
result.add(new TypeMapping(context.stackPtr - 2, m.type));
}
}
}
}
break;
case Constants.NEW:
{
NEW instr = (NEW) instruction;
filterSet(in, result, context.stackPtr);
String name = instr.getType(context.constPool()).toString();
name += "@" + context.method() + ":" + stmt.getPosition();
result.add(new TypeMapping(context.stackPtr, name));
doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(I)I", stmt, context, input, interpreter, state, retval);
}
break;
case Constants.ANEWARRAY:
{
ANEWARRAY instr = (ANEWARRAY) instruction;
filterSet(in, result, context.stackPtr - 1);
String name = instr.getType(context.constPool()).toString() + "[]";
name += "@" + context.method() + ":" + stmt.getPosition();
result.add(new TypeMapping(context.stackPtr - 1, name));
doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(II)I", stmt, context, input, interpreter, state, retval);
}
break;
case Constants.NEWARRAY:
{
NEWARRAY instr = (NEWARRAY) instruction;
filterSet(in, result, context.stackPtr - 1);
String name = instr.getType().toString();
name += "@" + context.method() + ":" + stmt.getPosition();
result.add(new TypeMapping(context.stackPtr - 1, name));
doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(II)I", stmt, context, input, interpreter, state, retval);
}
break;
case Constants.MULTIANEWARRAY:
{
MULTIANEWARRAY instr = (MULTIANEWARRAY) instruction;
int dim = instr.getDimensions();
filterSet(in, result, context.stackPtr - dim);
String type = instr.getType(context.constPool()).toString();
type = type.substring(0, type.indexOf("["));
for (int i = 1; i <= dim; i++) {
String type1 = type;
String type2 = type;
for (int k = 0; k < i; k++) {
type1 += "[]";
}
for (int k = 0; k < i - 1; k++) {
type2 += "[]";
}
type1 += "@" + context.method() + ":" + stmt.getPosition();
type2 += "@" + context.method() + ":" + stmt.getPosition();
result.add(new TypeMapping(type1, type2));
}
String name = instr.getType(context.constPool()).toString();
name += "@" + context.method() + ":" + stmt.getPosition();
result.add(new TypeMapping(context.stackPtr - dim, name));
doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "()I", stmt, context, input, interpreter, state, retval);
}
break;
case Constants.ILOAD_0:
case Constants.ILOAD_1:
case Constants.ILOAD_2:
case Constants.ILOAD_3:
case Constants.ILOAD:
case Constants.FLOAD_0:
case Constants.FLOAD_1:
case Constants.FLOAD_2:
case Constants.FLOAD_3:
case Constants.FLOAD:
case Constants.LLOAD_0:
case Constants.LLOAD_1:
case Constants.LLOAD_2:
case Constants.LLOAD_3:
case Constants.LLOAD:
case Constants.DLOAD_0:
case Constants.DLOAD_1:
case Constants.DLOAD_2:
case Constants.DLOAD_3:
case Constants.DLOAD:
result = in;
retval.put(context.callString, result);
break;
case Constants.ALOAD_0:
case Constants.ALOAD_1:
case Constants.ALOAD_2:
case Constants.ALOAD_3:
case Constants.ALOAD:
{
LoadInstruction instr = (LoadInstruction) instruction;
int index = instr.getIndex();
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr) {
result.add(m);
}
if (m.stackLoc == index) {
result.add(new TypeMapping(context.stackPtr, m.type));
}
}
}
break;
case Constants.ISTORE_0:
case Constants.ISTORE_1:
case Constants.ISTORE_2:
case Constants.ISTORE_3:
case Constants.ISTORE:
case Constants.FSTORE_0:
case Constants.FSTORE_1:
case Constants.FSTORE_2:
case Constants.FSTORE_3:
case Constants.FSTORE:
case Constants.LSTORE_0:
case Constants.LSTORE_1:
case Constants.LSTORE_2:
case Constants.LSTORE_3:
case Constants.LSTORE:
case Constants.DSTORE_0:
case Constants.DSTORE_1:
case Constants.DSTORE_2:
case Constants.DSTORE_3:
case Constants.DSTORE:
result = in;
retval.put(context.callString, result);
break;
case Constants.ASTORE_0:
case Constants.ASTORE_1:
case Constants.ASTORE_2:
case Constants.ASTORE_3:
case Constants.ASTORE:
{
StoreInstruction instr = (StoreInstruction) instruction;
int index = instr.getIndex();
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 1 && m.stackLoc != index) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(index, m.type));
}
}
}
break;
case Constants.FCMPL:
case Constants.FCMPG:
case Constants.LCMP:
case Constants.DCMPL:
case Constants.DCMPG:
result = in;
retval.put(context.callString, result);
break;
case Constants.IFEQ:
case Constants.IFNE:
case Constants.IFLT:
case Constants.IFGE:
case Constants.IFGT:
case Constants.IFLE:
case Constants.IFNULL:
case Constants.IFNONNULL:
filterSet(in, result, context.stackPtr - 1);
break;
case Constants.IF_ICMPEQ:
case Constants.IF_ICMPNE:
case Constants.IF_ICMPLT:
case Constants.IF_ICMPGE:
case Constants.IF_ICMPGT:
case Constants.IF_ICMPLE:
case Constants.IF_ACMPEQ:
case Constants.IF_ACMPNE:
filterSet(in, result, context.stackPtr - 2);
break;
case Constants.TABLESWITCH:
case Constants.LOOKUPSWITCH:
filterSet(in, result, context.stackPtr - 1);
break;
case Constants.GOTO:
result = in;
retval.put(context.callString, result);
break;
case Constants.IADD:
case Constants.ISUB:
case Constants.IMUL:
case Constants.IDIV:
case Constants.IREM:
case Constants.ISHL:
case Constants.ISHR:
case Constants.IUSHR:
case Constants.IAND:
case Constants.IOR:
case Constants.IXOR:
case Constants.FADD:
case Constants.FSUB:
case Constants.FMUL:
case Constants.FDIV:
case Constants.FREM:
case Constants.DADD:
case Constants.DSUB:
case Constants.DMUL:
case Constants.DDIV:
case Constants.DREM:
case Constants.IINC:
case Constants.INEG:
case Constants.FNEG:
case Constants.LNEG:
case Constants.DNEG:
case Constants.LADD:
case Constants.LAND:
case Constants.LOR:
case Constants.LXOR:
case Constants.LSUB:
case Constants.LSHL:
case Constants.LSHR:
case Constants.LUSHR:
result = in;
retval.put(context.callString, result);
break;
case Constants.LMUL:
case Constants.LDIV:
case Constants.LREM:
result = new LinkedHashSet<TypeMapping>(in);
retval.put(context.callString, result);
doInvokeStatic("com.jopdesign.sys.JVM.f_" + stmt.getInstruction().getName() + "(JJ)J", stmt, context, input, interpreter, state, retval);
break;
case Constants.I2B:
case Constants.I2C:
case Constants.I2S:
case Constants.I2F:
case Constants.F2I:
case Constants.I2L:
case Constants.I2D:
case Constants.F2L:
case Constants.F2D:
case Constants.L2I:
case Constants.D2I:
case Constants.L2F:
case Constants.D2F:
case Constants.L2D:
case Constants.D2L:
result = in;
retval.put(context.callString, result);
break;
case Constants.INSTANCEOF:
filterSet(in, result, context.stackPtr - 1);
break;
case Constants.CHECKCAST:
{
DFATool p = interpreter.getDFATool();
CHECKCAST instr = (CHECKCAST) instruction;
for (TypeMapping m : in) {
if (m.stackLoc < context.stackPtr - 1) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
// check whether this class can possibly be cast
String constClassName = instr.getType(context.constPool()).toString();
ClassInfo staticClass = p.getAppInfo().getClassInfo(constClassName);
ClassInfo dynamicClass = p.getAppInfo().getClassInfo(m.type.split("@")[0]);
// System.out.println("CHECKCAST: "+context.callString.asList()+"/"+context.method+": "+stmt+": "+constClassName+" vs "+m.type);
if (dynamicClass.isSubclassOf(staticClass)) {
result.add(m);
// System.out.println("yay!");
}
}
}
}
break;
case Constants.MONITORENTER:
filterSet(in, result, context.stackPtr - 1);
context.syncLevel++;
break;
case Constants.MONITOREXIT:
filterSet(in, result, context.stackPtr - 1);
context.syncLevel--;
if (context.syncLevel < 0) {
System.err.println("Synchronization level mismatch.");
System.exit(-1);
}
break;
case Constants.INVOKEVIRTUAL:
case Constants.INVOKEINTERFACE:
{
InvokeInstruction instr = (InvokeInstruction) instruction;
int argSize = MethodHelper.getArgSize(instr, context.constPool());
DFATool p = interpreter.getDFATool();
MethodRef ref = context.getMethodInfo().getCode().getInvokeSite(stmt).getInvokeeRef();
ClassInfo constClass = ref.getClassInfo();
// find possible receiver types
List<String> receivers = new LinkedList<String>();
for (TypeMapping m : in) {
if (m.stackLoc == context.stackPtr - argSize) {
String clName = m.type.split("@")[0];
ClassInfo dynamicClass;
// check whether this class can possibly be a receiver
try {
dynamicClass = p.getAppInfo().getClassInfo(clName);
} catch (MissingClassError ex) {
logger.error("TRANSFER/" + instr + ": " + ex);
continue;
}
if ((instr instanceof INVOKEVIRTUAL && dynamicClass.isSubclassOf(constClass)) || (instr instanceof INVOKEINTERFACE && dynamicClass.isImplementationOf(constClass))) {
receivers.add(clName);
} else {
logger.debug(context.method() + ": class " + constClass + " is not a superclass of " + clName);
}
}
}
/* Get the actual set of invoked methods */
// ArrayList<MethodInfo> invokeCandidates = new ArrayList<MethodInfo>();
String signature = ref.getMethodSignature();
for (String receiver : receivers) {
// find receiving method
MethodInfo impl = p.getAppInfo().getMethodInfoInherited(receiver, signature);
if (impl == null) {
throw new AppInfoError("Could not find implementation for: " + receiver + "#" + signature);
}
doInvokeVirtual(receiver, impl, stmt, context, input, interpreter, state, retval);
}
// add relevant information to result
filterSet(in, result, context.stackPtr - argSize);
}
break;
case Constants.INVOKESTATIC:
case Constants.INVOKESPECIAL:
{
InvokeInstruction instr = (InvokeInstruction) instruction;
int argSize = MethodHelper.getArgSize(instr, context.constPool());
MethodRef ref = context.getMethodInfo().getCode().getInvokeSite(stmt).getInvokeeRef();
MethodInfo impl = ref.getMethodInfo();
if (impl == null) {
throw new AppInfoError("Cannot find implementation of " + ref);
} else if (impl.isPrivate() && !impl.isStatic()) {
doInvokeVirtual(ref.getClassName(), impl, stmt, context, input, interpreter, state, retval);
} else {
doInvokeStatic(impl.getMemberID().toString(), stmt, context, input, interpreter, state, retval);
}
// add relevant information to result
filterSet(in, result, context.stackPtr - argSize);
}
break;
case Constants.RETURN:
case Constants.IRETURN:
case Constants.FRETURN:
case Constants.LRETURN:
case Constants.DRETURN:
filterSet(in, result, 0);
break;
case Constants.ARETURN:
{
for (TypeMapping m : in) {
if (m.stackLoc < 0) {
result.add(m);
}
if (m.stackLoc == context.stackPtr - 1) {
result.add(new TypeMapping(0, m.type));
}
}
}
break;
default:
System.out.println("Unknown opcode: " + instruction.toString(context.constPool().getConstantPool()));
System.exit(-1);
}
// System.out.print(instruction+":\t{ ");
// for (Iterator k = result.iterator(); k.hasNext(); ) {
// ReceiverTypes.TypeMapping m = (ReceiverTypes.TypeMapping) k.next();
// if (m.stackLoc >= 0) {
// System.out.print("<stack[" + m.stackLoc + "], " + m.type +">, ");
// } else {
// System.out.print("<" + m.heapLoc + ", " + m.type +">, ");
// }
// }
// System.out.println("}");
// System.out.println("AFTER "+context.method+": "+stmt+" / "+context.callString.asList());
// System.out.print(stmt.getInstruction()+":\t{ ");
// System.out.print(context.callString.asList()+": "+retval.get(context.callString));
// System.out.println(" }");
context.stackPtr += instruction.produceStack(context.constPool()) - instruction.consumeStack(context.constPool());
return retval;
}
Also used :
LinkedHashSet(java.util.LinkedHashSet)
NEW(org.apache.bcel.generic.NEW)
LinkedHashSet(java.util.LinkedHashSet)
Set(java.util.Set)
MULTIANEWARRAY(org.apache.bcel.generic.MULTIANEWARRAY)
ANEWARRAY(org.apache.bcel.generic.ANEWARRAY)
CHECKCAST(org.apache.bcel.generic.CHECKCAST)
LDC(org.apache.bcel.generic.LDC)
CallString(com.jopdesign.common.code.CallString)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
LoadInstruction(org.apache.bcel.generic.LoadInstruction)
StoreInstruction(org.apache.bcel.generic.StoreInstruction)
Instruction(org.apache.bcel.generic.Instruction)
ReferenceType(org.apache.bcel.generic.ReferenceType)
AppInfoError(com.jopdesign.common.misc.AppInfoError)
PUTSTATIC(org.apache.bcel.generic.PUTSTATIC)
LoadInstruction(org.apache.bcel.generic.LoadInstruction)
MethodRef(com.jopdesign.common.type.MethodRef)
LinkedList(java.util.LinkedList)
List(java.util.List)
MissingClassError(com.jopdesign.common.misc.MissingClassError)
Context(com.jopdesign.dfa.framework.Context)
MULTIANEWARRAY(org.apache.bcel.generic.MULTIANEWARRAY)
ANEWARRAY(org.apache.bcel.generic.ANEWARRAY)
NEWARRAY(org.apache.bcel.generic.NEWARRAY)
DFATool(com.jopdesign.dfa.DFATool)
FieldRef(com.jopdesign.common.type.FieldRef)
PUTFIELD(org.apache.bcel.generic.PUTFIELD)
MULTIANEWARRAY(org.apache.bcel.generic.MULTIANEWARRAY)
ContextMap(com.jopdesign.dfa.framework.ContextMap)
CallString(com.jopdesign.common.code.CallString)
GETFIELD(org.apache.bcel.generic.GETFIELD)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
ReferenceType(org.apache.bcel.generic.ReferenceType)
Type(org.apache.bcel.generic.Type)
INVOKEINTERFACE(org.apache.bcel.generic.INVOKEINTERFACE)
MethodInfo(com.jopdesign.common.MethodInfo)
GETSTATIC(org.apache.bcel.generic.GETSTATIC)
StoreInstruction(org.apache.bcel.generic.StoreInstruction)
INVOKEVIRTUAL(org.apache.bcel.generic.INVOKEVIRTUAL)
ClassInfo(com.jopdesign.common.ClassInfo)
Example 5 with LDC
use of org.apache.bcel.generic.LDC in project jop by jop-devel.
the class SimpleInliner method analyzeInvokee.
/**
* @param cs the callstring from the invoker to the invoke to inline (if recursive). Used to check DFA results.
* @param invokee the invoked method to analyze
* @param inlineData the map to populate with the parameters and the instructions to inline.
* @return true if inlining is possible
*/
private boolean analyzeInvokee(CallString cs, MethodInfo invokee, InlineData inlineData) {
// we allow loading of parameters, loading of constants, some instruction, and a return
ValueMapAnalysis values = new ValueMapAnalysis(invokee);
values.loadParameters();
InstructionList il = invokee.getCode().getInstructionList(true, false);
InstructionHandle ih = il.getStart();
// we should at least have a return instruction, so even for empty methods we should fall through
// generate the parameter mapping
int count = 0;
while (true) {
Instruction instruction = ih.getInstruction();
if (instruction instanceof PushInstruction || instruction instanceof NOP) {
values.transfer(instruction);
ih = ih.getNext();
count++;
} else {
break;
}
}
// store the mapping
for (ValueInfo value : values.getValueTable().getStack()) {
inlineData.addParam(value);
}
inlineData.setInlineStart(count);
// if we do not need an NP check, we can also inline code which does not throw an exception in the same way
boolean needsNPCheck = helper.needsNullpointerCheck(cs, invokee, false);
boolean hasNPCheck = false;
// we allow up to 5 instructions and one return before assuming that the resulting code will be too large
for (int i = 0; i < 6; i++) {
// now lets see what we have here as non-push instructions
Instruction instruction = ih.getInstruction();
if (instruction instanceof InvokeInstruction) {
if (inlineData.getInvokeSite() != null) {
// only inline at most one invoke
return false;
}
InvokeSite is = invokee.getCode().getInvokeSite(ih);
inlineData.setInvokeSite(is);
hasNPCheck |= !is.isInvokeStatic();
} else if (instruction instanceof FieldInstruction) {
if (instruction instanceof GETFIELD) {
hasNPCheck |= values.getValueTable().top().isThisReference();
}
if (instruction instanceof PUTFIELD) {
int down = values.getValueTable().top().isContinued() ? 2 : 1;
hasNPCheck |= values.getValueTable().top(down).isThisReference();
}
} else if (instruction instanceof ArithmeticInstruction || instruction instanceof ConversionInstruction || instruction instanceof StackInstruction || instruction instanceof LDC || instruction instanceof LDC2_W || instruction instanceof ARRAYLENGTH || instruction instanceof CHECKCAST || instruction instanceof NOP) {
// nothing to do, just copy them
} else if (instruction instanceof ReturnInstruction) {
if (needsNPCheck && !hasNPCheck) {
// We were nearly finished.. but NP check test failed
this.requiresNPCheck++;
if (logger.isTraceEnabled()) {
logger.trace("Not inlining " + invokee + " because it requires a NP check.");
}
return false;
}
// else we need to add pop instructions
if (instruction instanceof RETURN) {
// we do not return anything, so we must empty the stack
while (values.getValueTable().getStackSize() > 0) {
Instruction pop;
if (values.getValueTable().top().isContinued()) {
pop = new POP2();
} else {
pop = new POP();
}
inlineData.addEpilogue(pop);
values.transfer(pop);
}
return true;
} else {
Type type = ((ReturnInstruction) instruction).getType();
// javac anyway)
return values.getValueTable().getStackSize() == type.getSize();
}
} else {
// if we encounter an instruction which we do not handle, we do not inline
unhandledInstructions++;
if (logger.isTraceEnabled()) {
logger.trace("Not inlining " + invokee + " because of unhandled instruction " + instruction.toString(invokee.getClassInfo().getConstantPoolGen().getConstantPool()));
}
return false;
}
// update the stack map since we need it to handle RETURN
values.transfer(instruction);
ih = ih.getNext();
}
// too many instructions, do not inline
return false;
}
Also used :
ArithmeticInstruction(org.apache.bcel.generic.ArithmeticInstruction)
ValueMapAnalysis(com.jopdesign.jcopter.analysis.ValueMapAnalysis)
ARRAYLENGTH(org.apache.bcel.generic.ARRAYLENGTH)
POP2(org.apache.bcel.generic.POP2)
InstructionList(org.apache.bcel.generic.InstructionList)
CHECKCAST(org.apache.bcel.generic.CHECKCAST)
StackInstruction(org.apache.bcel.generic.StackInstruction)
ConversionInstruction(org.apache.bcel.generic.ConversionInstruction)
LDC(org.apache.bcel.generic.LDC)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
StackInstruction(org.apache.bcel.generic.StackInstruction)
Instruction(org.apache.bcel.generic.Instruction)
FieldInstruction(org.apache.bcel.generic.FieldInstruction)
ArithmeticInstruction(org.apache.bcel.generic.ArithmeticInstruction)
ConversionInstruction(org.apache.bcel.generic.ConversionInstruction)
ReturnInstruction(org.apache.bcel.generic.ReturnInstruction)
PushInstruction(org.apache.bcel.generic.PushInstruction)
InstructionHandle(org.apache.bcel.generic.InstructionHandle)
ReturnInstruction(org.apache.bcel.generic.ReturnInstruction)
RETURN(org.apache.bcel.generic.RETURN)
LDC2_W(org.apache.bcel.generic.LDC2_W)
ValueInfo(com.jopdesign.common.type.ValueInfo)
PUTFIELD(org.apache.bcel.generic.PUTFIELD)
PushInstruction(org.apache.bcel.generic.PushInstruction)
NOP(org.apache.bcel.generic.NOP)
POP(org.apache.bcel.generic.POP)
InvokeInstruction(org.apache.bcel.generic.InvokeInstruction)
GETFIELD(org.apache.bcel.generic.GETFIELD)
Type(org.apache.bcel.generic.Type)
InvokeSite(com.jopdesign.common.code.InvokeSite)
FieldInstruction(org.apache.bcel.generic.FieldInstruction)
Aggregations
Instruction (org.apache.bcel.generic.Instruction)5
LDC (org.apache.bcel.generic.LDC)5
Type (org.apache.bcel.generic.Type)5
GETFIELD (org.apache.bcel.generic.GETFIELD)4
InvokeInstruction (org.apache.bcel.generic.InvokeInstruction)4
PUTFIELD (org.apache.bcel.generic.PUTFIELD)4
ReferenceType (org.apache.bcel.generic.ReferenceType)4
CallString (com.jopdesign.common.code.CallString)3
DFATool (com.jopdesign.dfa.DFATool)3
Context (com.jopdesign.dfa.framework.Context)3
ContextMap (com.jopdesign.dfa.framework.ContextMap)3
Set (java.util.Set)3
FieldInstruction (org.apache.bcel.generic.FieldInstruction)3
GETSTATIC (org.apache.bcel.generic.GETSTATIC)3
LoadInstruction (org.apache.bcel.generic.LoadInstruction)3
PUTSTATIC (org.apache.bcel.generic.PUTSTATIC)3
StoreInstruction (org.apache.bcel.generic.StoreInstruction)3
MethodInfo (com.jopdesign.common.MethodInfo)2
AppInfoError (com.jopdesign.common.misc.AppInfoError)2
LinkedHashSet (java.util.LinkedHashSet)2
