/**
* Creates a new local variable of the given type.
*
* @param type the type of the local variable to be created.
* @return the identifier of the newly created local variable.
*/
public int newLocal(final Type type) {
Object t;
switch (type.getSort()) {
case Type.BOOLEAN:
case Type.CHAR:
case Type.BYTE:
case Type.SHORT:
case Type.INT:
t = Opcodes.INTEGER;
break;
case Type.FLOAT:
t = Opcodes.FLOAT;
break;
case Type.LONG:
t = Opcodes.LONG;
break;
case Type.DOUBLE:
t = Opcodes.DOUBLE;
break;
case Type.ARRAY:
t = type.getDescriptor();
break;
// case Type.OBJECT:
default:
t = type.getInternalName();
break;
}
int local = nextLocal;
setLocalType(local, type);
setFrameLocal(local, t);
nextLocal += type.getSize();
return local;
}
/**
* Creates a new {@link AnalyzerAdapter}.
*
* @param api the ASM API version implemented by this visitor. Must be one of {@link Opcodes#ASM4}
* or {@link Opcodes#ASM5}.
* @param owner the owner's class name.
* @param access the method's access flags (see {@link Opcodes}).
* @param name the method's name.
* @param desc the method's descriptor (see {@link Type Type}).
* @param mv the method visitor to which this adapter delegates calls. May be <tt>null</tt>.
*/
protected AnalyzerAdapter(
final int api,
final String owner,
final int access,
final String name,
final String desc,
final MethodVisitor mv) {
super(api, mv);
this.owner = owner;
locals = new ArrayList<Object>();
stack = new ArrayList<Object>();
uninitializedTypes = new HashMap<Object, Object>();
if ((access & Opcodes.ACC_STATIC) == 0) {
if ("<init>".equals(name)) {
locals.add(Opcodes.UNINITIALIZED_THIS);
} else {
locals.add(owner);
}
}
Type[] types = Type.getArgumentTypes(desc);
for (int i = 0; i < types.length; ++i) {
Type type = types[i];
switch (type.getSort()) {
case Type.BOOLEAN:
case Type.CHAR:
case Type.BYTE:
case Type.SHORT:
case Type.INT:
locals.add(Opcodes.INTEGER);
break;
case Type.FLOAT:
locals.add(Opcodes.FLOAT);
break;
case Type.LONG:
locals.add(Opcodes.LONG);
locals.add(Opcodes.TOP);
break;
case Type.DOUBLE:
locals.add(Opcodes.DOUBLE);
locals.add(Opcodes.TOP);
break;
case Type.ARRAY:
locals.add(types[i].getDescriptor());
break;
// case Type.OBJECT:
default:
locals.add(types[i].getInternalName());
}
}
maxLocals = locals.size();
}
/**
* Creates a new {@link LocalVariablesSorter}.
*
* @param access access flags of the adapted method.
* @param desc the method's descriptor (see {@link Type Type}).
* @param mv the method visitor to which this adapter delegates calls.
*/
public LocalVariablesSorter(final int access, final String desc, final MethodVisitor mv) {
super(mv);
Type[] args = Type.getArgumentTypes(desc);
nextLocal = (Opcodes.ACC_STATIC & access) != 0 ? 0 : 1;
for (int i = 0; i < args.length; i++) {
nextLocal += args[i].getSize();
}
firstLocal = nextLocal;
}
private int remap(final int var, final Type type) {
if (var < firstLocal) {
return var;
}
int key = 2 * var + type.getSize() - 1;
int size = mapping.length;
if (key >= size) {
int[] newMapping = new int[Math.max(2 * size, key + 1)];
System.arraycopy(mapping, 0, newMapping, 0, size);
mapping = newMapping;
}
int value = mapping[key];
if (value == 0) {
value = nextLocal + 1;
mapping[key] = value;
setLocalType(nextLocal, type);
nextLocal += type.getSize();
}
if (value - 1 != var) {
changed = true;
}
return value - 1;
}
private void pop(final String desc) {
char c = desc.charAt(0);
if (c == '(') {
int n = 0;
Type[] types = Type.getArgumentTypes(desc);
for (int i = 0; i < types.length; ++i) {
n += types[i].getSize();
}
pop(n);
} else if (c == 'J' || c == 'D') {
pop(2);
} else {
pop(1);
}
}
/**
* A {@link MethodAdapter} that renumbers local variables in their order of appearance. This adapter
* allows one to easily add new local variables to a method. It may be used by inheriting from this
* class, but the preferred way of using it is via delegation: the next visitor in the chain can
* indeed add new locals when needed by calling {@link #newLocal} on this adapter (this requires a
* reference back to this {@link LocalVariablesSorter}).
*
* @author Chris Nokleberg
* @author Eugene Kuleshov
* @author Eric Bruneton
*/
public class LocalVariablesSorter extends MethodAdapter {
private static final Type OBJECT_TYPE = Type.getObjectType("java/lang/Object");
/**
* Mapping from old to new local variable indexes. A local variable at index i of size 1 is
* remapped to 'mapping[2*i]', while a local variable at index i of size 2 is remapped to
* 'mapping[2*i+1]'.
*/
private int[] mapping = new int[40];
/** Array used to store stack map local variable types after remapping. */
private Object[] newLocals = new Object[20];
/** Index of the first local variable, after formal parameters. */
protected final int firstLocal;
/** Index of the next local variable to be created by {@link #newLocal}. */
protected int nextLocal;
/** Indicates if at least one local variable has moved due to remapping. */
private boolean changed;
/**
* Creates a new {@link LocalVariablesSorter}.
*
* @param access access flags of the adapted method.
* @param desc the method's descriptor (see {@link Type Type}).
* @param mv the method visitor to which this adapter delegates calls.
*/
public LocalVariablesSorter(final int access, final String desc, final MethodVisitor mv) {
super(mv);
Type[] args = Type.getArgumentTypes(desc);
nextLocal = (Opcodes.ACC_STATIC & access) != 0 ? 0 : 1;
for (int i = 0; i < args.length; i++) {
nextLocal += args[i].getSize();
}
firstLocal = nextLocal;
}
public void visitVarInsn(final int opcode, final int var) {
Type type;
switch (opcode) {
case Opcodes.LLOAD:
case Opcodes.LSTORE:
type = Type.LONG_TYPE;
break;
case Opcodes.DLOAD:
case Opcodes.DSTORE:
type = Type.DOUBLE_TYPE;
break;
case Opcodes.FLOAD:
case Opcodes.FSTORE:
type = Type.FLOAT_TYPE;
break;
case Opcodes.ILOAD:
case Opcodes.ISTORE:
type = Type.INT_TYPE;
break;
case Opcodes.ALOAD:
case Opcodes.ASTORE:
type = OBJECT_TYPE;
break;
// case RET:
default:
type = Type.VOID_TYPE;
}
mv.visitVarInsn(opcode, remap(var, type));
}
public void visitIincInsn(final int var, final int increment) {
mv.visitIincInsn(remap(var, Type.INT_TYPE), increment);
}
public void visitMaxs(final int maxStack, final int maxLocals) {
mv.visitMaxs(maxStack, nextLocal);
}
public void visitLocalVariable(
final String name,
final String desc,
final String signature,
final Label start,
final Label end,
final int index) {
int size = "J".equals(desc) || "D".equals(desc) ? 2 : 1;
int newIndex = remap(index, size);
mv.visitLocalVariable(name, desc, signature, start, end, newIndex);
}
public void visitFrame(
final int type,
final int nLocal,
final Object[] local,
final int nStack,
final Object[] stack) {
if (type != Opcodes.F_NEW) { // uncompressed frame
throw new IllegalStateException(
"ClassReader.accept() should be called with EXPAND_FRAMES flag");
}
if (!changed) { // optimization for the case where mapping = identity
mv.visitFrame(type, nLocal, local, nStack, stack);
return;
}
// creates a copy of newLocals
Object[] oldLocals = new Object[newLocals.length];
System.arraycopy(newLocals, 0, oldLocals, 0, oldLocals.length);
// copies types from 'local' to 'newLocals'
// 'newLocals' already contains the variables added with 'newLocal'
int index = 0; // old local variable index
int number = 0; // old local variable number
for (; number < nLocal; ++number) {
Object t = local[number];
int size = t == Opcodes.LONG || t == Opcodes.DOUBLE ? 2 : 1;
if (t != Opcodes.TOP) {
setFrameLocal(remap(index, size), t);
}
index += size;
}
// removes TOP after long and double types as well as trailing TOPs
index = 0;
number = 0;
for (int i = 0; index < newLocals.length; ++i) {
Object t = newLocals[index++];
if (t != null && t != Opcodes.TOP) {
newLocals[i] = t;
number = i + 1;
if (t == Opcodes.LONG || t == Opcodes.DOUBLE) {
index += 1;
}
} else {
newLocals[i] = Opcodes.TOP;
}
}
// visits remapped frame
mv.visitFrame(type, number, newLocals, nStack, stack);
// restores original value of 'newLocals'
newLocals = oldLocals;
}
// -------------
/**
* Creates a new local variable of the given type.
*
* @param type the type of the local variable to be created.
* @return the identifier of the newly created local variable.
*/
public int newLocal(final Type type) {
Object t;
switch (type.getSort()) {
case Type.BOOLEAN:
case Type.CHAR:
case Type.BYTE:
case Type.SHORT:
case Type.INT:
t = Opcodes.INTEGER;
break;
case Type.FLOAT:
t = Opcodes.FLOAT;
break;
case Type.LONG:
t = Opcodes.LONG;
break;
case Type.DOUBLE:
t = Opcodes.DOUBLE;
break;
case Type.ARRAY:
t = type.getDescriptor();
break;
// case Type.OBJECT:
default:
t = type.getInternalName();
break;
}
int local = nextLocal;
setLocalType(local, type);
setFrameLocal(local, t);
nextLocal += type.getSize();
return local;
}
/**
* Sets the current type of the given local variable. The default implementation of this method
* does nothing.
*
* @param local a local variable identifier, as returned by {@link #newLocal newLocal()}.
* @param type the type of the value being stored in the local variable
*/
protected void setLocalType(final int local, final Type type) {}
private void setFrameLocal(final int local, final Object type) {
int l = newLocals.length;
if (local >= l) {
Object[] a = new Object[Math.max(2 * l, local + 1)];
System.arraycopy(newLocals, 0, a, 0, l);
newLocals = a;
}
newLocals[local] = type;
}
private int remap(final int var, final Type type) {
if (var < firstLocal) {
return var;
}
int key = 2 * var + type.getSize() - 1;
int size = mapping.length;
if (key >= size) {
int[] newMapping = new int[Math.max(2 * size, key + 1)];
System.arraycopy(mapping, 0, newMapping, 0, size);
mapping = newMapping;
}
int value = mapping[key];
if (value == 0) {
value = nextLocal + 1;
mapping[key] = value;
setLocalType(nextLocal, type);
nextLocal += type.getSize();
}
if (value - 1 != var) {
changed = true;
}
return value - 1;
}
private int remap(final int var, final int size) {
if (var < firstLocal || !changed) {
return var;
}
int key = 2 * var + size - 1;
int value = key < mapping.length ? mapping[key] : 0;
if (value == 0) {
throw new IllegalStateException("Unknown local variable " + var);
}
return value - 1;
}
}
private void execute(final int opcode, final int iarg, final String sarg) {
if (this.locals == null) {
labels = null;
return;
}
Object t1, t2, t3, t4;
switch (opcode) {
case Opcodes.NOP:
case Opcodes.INEG:
case Opcodes.LNEG:
case Opcodes.FNEG:
case Opcodes.DNEG:
case Opcodes.I2B:
case Opcodes.I2C:
case Opcodes.I2S:
case Opcodes.GOTO:
case Opcodes.RETURN:
break;
case Opcodes.ACONST_NULL:
push(Opcodes.NULL);
break;
case Opcodes.ICONST_M1:
case Opcodes.ICONST_0:
case Opcodes.ICONST_1:
case Opcodes.ICONST_2:
case Opcodes.ICONST_3:
case Opcodes.ICONST_4:
case Opcodes.ICONST_5:
case Opcodes.BIPUSH:
case Opcodes.SIPUSH:
push(Opcodes.INTEGER);
break;
case Opcodes.LCONST_0:
case Opcodes.LCONST_1:
push(Opcodes.LONG);
push(Opcodes.TOP);
break;
case Opcodes.FCONST_0:
case Opcodes.FCONST_1:
case Opcodes.FCONST_2:
push(Opcodes.FLOAT);
break;
case Opcodes.DCONST_0:
case Opcodes.DCONST_1:
push(Opcodes.DOUBLE);
push(Opcodes.TOP);
break;
case Opcodes.ILOAD:
case Opcodes.FLOAD:
case Opcodes.ALOAD:
push(get(iarg));
break;
case Opcodes.LLOAD:
case Opcodes.DLOAD:
push(get(iarg));
push(Opcodes.TOP);
break;
case Opcodes.IALOAD:
case Opcodes.BALOAD:
case Opcodes.CALOAD:
case Opcodes.SALOAD:
pop(2);
push(Opcodes.INTEGER);
break;
case Opcodes.LALOAD:
case Opcodes.D2L:
pop(2);
push(Opcodes.LONG);
push(Opcodes.TOP);
break;
case Opcodes.FALOAD:
pop(2);
push(Opcodes.FLOAT);
break;
case Opcodes.DALOAD:
case Opcodes.L2D:
pop(2);
push(Opcodes.DOUBLE);
push(Opcodes.TOP);
break;
case Opcodes.AALOAD:
pop(1);
t1 = pop();
if (t1 instanceof String) {
pushDesc(((String) t1).substring(1));
} else {
push("java/lang/Object");
}
break;
case Opcodes.ISTORE:
case Opcodes.FSTORE:
case Opcodes.ASTORE:
t1 = pop();
set(iarg, t1);
if (iarg > 0) {
t2 = get(iarg - 1);
if (t2 == Opcodes.LONG || t2 == Opcodes.DOUBLE) {
set(iarg - 1, Opcodes.TOP);
}
}
break;
case Opcodes.LSTORE:
case Opcodes.DSTORE:
pop(1);
t1 = pop();
set(iarg, t1);
set(iarg + 1, Opcodes.TOP);
if (iarg > 0) {
t2 = get(iarg - 1);
if (t2 == Opcodes.LONG || t2 == Opcodes.DOUBLE) {
set(iarg - 1, Opcodes.TOP);
}
}
break;
case Opcodes.IASTORE:
case Opcodes.BASTORE:
case Opcodes.CASTORE:
case Opcodes.SASTORE:
case Opcodes.FASTORE:
case Opcodes.AASTORE:
pop(3);
break;
case Opcodes.LASTORE:
case Opcodes.DASTORE:
pop(4);
break;
case Opcodes.POP:
case Opcodes.IFEQ:
case Opcodes.IFNE:
case Opcodes.IFLT:
case Opcodes.IFGE:
case Opcodes.IFGT:
case Opcodes.IFLE:
case Opcodes.IRETURN:
case Opcodes.FRETURN:
case Opcodes.ARETURN:
case Opcodes.TABLESWITCH:
case Opcodes.LOOKUPSWITCH:
case Opcodes.ATHROW:
case Opcodes.MONITORENTER:
case Opcodes.MONITOREXIT:
case Opcodes.IFNULL:
case Opcodes.IFNONNULL:
pop(1);
break;
case Opcodes.POP2:
case Opcodes.IF_ICMPEQ:
case Opcodes.IF_ICMPNE:
case Opcodes.IF_ICMPLT:
case Opcodes.IF_ICMPGE:
case Opcodes.IF_ICMPGT:
case Opcodes.IF_ICMPLE:
case Opcodes.IF_ACMPEQ:
case Opcodes.IF_ACMPNE:
case Opcodes.LRETURN:
case Opcodes.DRETURN:
pop(2);
break;
case Opcodes.DUP:
t1 = pop();
push(t1);
push(t1);
break;
case Opcodes.DUP_X1:
t1 = pop();
t2 = pop();
push(t1);
push(t2);
push(t1);
break;
case Opcodes.DUP_X2:
t1 = pop();
t2 = pop();
t3 = pop();
push(t1);
push(t3);
push(t2);
push(t1);
break;
case Opcodes.DUP2:
t1 = pop();
t2 = pop();
push(t2);
push(t1);
push(t2);
push(t1);
break;
case Opcodes.DUP2_X1:
t1 = pop();
t2 = pop();
t3 = pop();
push(t2);
push(t1);
push(t3);
push(t2);
push(t1);
break;
case Opcodes.DUP2_X2:
t1 = pop();
t2 = pop();
t3 = pop();
t4 = pop();
push(t2);
push(t1);
push(t4);
push(t3);
push(t2);
push(t1);
break;
case Opcodes.SWAP:
t1 = pop();
t2 = pop();
push(t1);
push(t2);
break;
case Opcodes.IADD:
case Opcodes.ISUB:
case Opcodes.IMUL:
case Opcodes.IDIV:
case Opcodes.IREM:
case Opcodes.IAND:
case Opcodes.IOR:
case Opcodes.IXOR:
case Opcodes.ISHL:
case Opcodes.ISHR:
case Opcodes.IUSHR:
case Opcodes.L2I:
case Opcodes.D2I:
case Opcodes.FCMPL:
case Opcodes.FCMPG:
pop(2);
push(Opcodes.INTEGER);
break;
case Opcodes.LADD:
case Opcodes.LSUB:
case Opcodes.LMUL:
case Opcodes.LDIV:
case Opcodes.LREM:
case Opcodes.LAND:
case Opcodes.LOR:
case Opcodes.LXOR:
pop(4);
push(Opcodes.LONG);
push(Opcodes.TOP);
break;
case Opcodes.FADD:
case Opcodes.FSUB:
case Opcodes.FMUL:
case Opcodes.FDIV:
case Opcodes.FREM:
case Opcodes.L2F:
case Opcodes.D2F:
pop(2);
push(Opcodes.FLOAT);
break;
case Opcodes.DADD:
case Opcodes.DSUB:
case Opcodes.DMUL:
case Opcodes.DDIV:
case Opcodes.DREM:
pop(4);
push(Opcodes.DOUBLE);
push(Opcodes.TOP);
break;
case Opcodes.LSHL:
case Opcodes.LSHR:
case Opcodes.LUSHR:
pop(3);
push(Opcodes.LONG);
push(Opcodes.TOP);
break;
case Opcodes.IINC:
set(iarg, Opcodes.INTEGER);
break;
case Opcodes.I2L:
case Opcodes.F2L:
pop(1);
push(Opcodes.LONG);
push(Opcodes.TOP);
break;
case Opcodes.I2F:
pop(1);
push(Opcodes.FLOAT);
break;
case Opcodes.I2D:
case Opcodes.F2D:
pop(1);
push(Opcodes.DOUBLE);
push(Opcodes.TOP);
break;
case Opcodes.F2I:
case Opcodes.ARRAYLENGTH:
case Opcodes.INSTANCEOF:
pop(1);
push(Opcodes.INTEGER);
break;
case Opcodes.LCMP:
case Opcodes.DCMPL:
case Opcodes.DCMPG:
pop(4);
push(Opcodes.INTEGER);
break;
case Opcodes.JSR:
case Opcodes.RET:
throw new RuntimeException("JSR/RET are not supported");
case Opcodes.GETSTATIC:
pushDesc(sarg);
break;
case Opcodes.PUTSTATIC:
pop(sarg);
break;
case Opcodes.GETFIELD:
pop(1);
pushDesc(sarg);
break;
case Opcodes.PUTFIELD:
pop(sarg);
pop();
break;
case Opcodes.NEW:
push(labels.get(0));
break;
case Opcodes.NEWARRAY:
pop();
switch (iarg) {
case Opcodes.T_BOOLEAN:
pushDesc("[Z");
break;
case Opcodes.T_CHAR:
pushDesc("[C");
break;
case Opcodes.T_BYTE:
pushDesc("[B");
break;
case Opcodes.T_SHORT:
pushDesc("[S");
break;
case Opcodes.T_INT:
pushDesc("[I");
break;
case Opcodes.T_FLOAT:
pushDesc("[F");
break;
case Opcodes.T_DOUBLE:
pushDesc("[D");
break;
// case Opcodes.T_LONG:
default:
pushDesc("[J");
break;
}
break;
case Opcodes.ANEWARRAY:
pop();
pushDesc("[" + Type.getObjectType(sarg));
break;
case Opcodes.CHECKCAST:
pop();
pushDesc(Type.getObjectType(sarg).getDescriptor());
break;
// case Opcodes.MULTIANEWARRAY:
default:
pop(iarg);
pushDesc(sarg);
break;
}
labels = null;
}