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package soot.coffi;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 1997 Clark Verbrugge
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 2.1 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import java.util.StringTokenizer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import soot.Value;
/**
* Base abstract class for constant pool entries; includes some utility methods.
*
* @see ClassFile#constant_pool
* @author Clark Verbrugge
*/
abstract class cp_info {
private static final Logger logger = LoggerFactory.getLogger(cp_info.class);
public static final byte CONSTANT_Utf8 = 1;
public static final byte CONSTANT_Integer = 3;
public static final byte CONSTANT_Float = 4;
public static final byte CONSTANT_Long = 5;
public static final byte CONSTANT_Double = 6;
public static final byte CONSTANT_Class = 7;
public static final byte CONSTANT_String = 8;
public static final byte CONSTANT_Fieldref = 9;
public static final byte CONSTANT_Methodref = 10;
public static final byte CONSTANT_InterfaceMethodref = 11;
public static final byte CONSTANT_NameAndType = 12;
public static final byte CONSTANT_MethodHandle = 15;
public static final byte CONSTANT_MethodType = 16; // TODO
public static final byte CONSTANT_InvokeDynamic = 18;
/* constants for method handle kinds */
public static final byte REF_getField = 1;
public static final byte REF_getStatic = 2;
public static final byte REF_putField = 3;
public static final byte REF_putStatic = 4;
public static final byte REF_invokeVirtual = 5;
public static final byte REF_invokeStatic = 6;
public static final byte REF_invokeSpecial = 7;
public static final byte REF_newInvokeSpecial = 8;
public static final byte REF_invokeInterface = 9;
// mapping from the above to the kinds of members they refer to
public static final byte[] REF_TO_CONSTANT = { -1, CONSTANT_Fieldref, // getField...
CONSTANT_Fieldref, //
CONSTANT_Fieldref, //
CONSTANT_Fieldref, //
CONSTANT_Methodref, // invokeVirtual...
CONSTANT_Methodref, CONSTANT_Methodref, CONSTANT_Methodref, CONSTANT_InterfaceMethodref,// invokeInterface
};
/** One of the CONSTANT_* constants. */
public byte tag;
/**
* Returns the size of this entry.
*
* @return size (in bytes) of this entry.
*/
public abstract int size();
/**
* Returns a String representation of this entry.
*
* @param constant_pool
* constant pool of ClassFile.
* @return String representation of this entry.
*/
public abstract String toString(cp_info constant_pool[]);
/**
* Returns a String description of what kind of entry this is.
*
* @return String representation of this kind of entry.
*/
public abstract String typeName();
/**
* Compares this entry with another cp_info object (which may reside in a different constant pool).
*
* @param constant_pool
* constant pool of ClassFile for this.
* @param cp
* constant pool entry to compare against.
* @param cp_constant_pool
* constant pool of ClassFile for cp.
* @return a value <0, 0, or >0 indicating whether this is smaller, the same or larger than cp.
*/
public abstract int compareTo(cp_info constant_pool[], cp_info cp, cp_info cp_constant_pool[]);
/**
* Utility method, converts two integers into a single long.
*
* @param high
* upper 32 bits of the long.
* @param low
* lower 32 bits of the long.
* @return a long value composed from the two ints.
*/
public static long ints2long(long high, long low) {
long h, l;
h = high;
l = low;
return ((h << 32) + l);
}
/**
* Utility method, returns a String binary representation of the given integer.
*
* @param i
* the integer in question.
* @return a String of 0's and 1's.
* @see cp_info#printBits(long)
*/
public static String printBits(int i) {
String s = "";
int j, k;
k = 1;
for (j = 0; j < 32; j++) {
if ((i & k) != 0) {
s = "1" + s;
} else {
s = "0" + s;
}
k = k << 1;
}
return s;
}
/**
* Utility method, returns a String binary representation of the given long.
*
* @param i
* the long in question.
* @return a String of 0's and 1's.
* @see cp_info#printBits(int)
*/
public static String printBits(long i) {
String s = "";
long j, k;
k = 1;
for (j = 0; j < 64; j++) {
if ((i & k) != 0) {
s = "1" + s;
} else {
s = "0" + s;
}
k = k << 1;
}
return s;
}
/**
* Locates the name of the corresponding class, given the constant pool index of either a CONSTANT_Class, _Fieldref,
* Methodref or InterfaceMethodref.
*
* @param constant_pool
* constant pool of ClassFile.
* @param i
* index of cp_info entry in question.
* @return name of the associated class.
*/
public static String getClassname(cp_info constant_pool[], int i) {
cp_info c = constant_pool[i];
switch (c.tag) {
case cp_info.CONSTANT_Class:
return c.toString(constant_pool);
case cp_info.CONSTANT_Fieldref:
return getClassname(constant_pool, ((CONSTANT_Fieldref_info) c).class_index);
case cp_info.CONSTANT_Methodref:
return getClassname(constant_pool, ((CONSTANT_Methodref_info) c).class_index);
case cp_info.CONSTANT_InterfaceMethodref:
return getClassname(constant_pool, ((CONSTANT_InterfaceMethodref_info) c).class_index);
}
logger.debug("Request for classname for non-class object!");
return "Can't find classname. Sorry.";
}
/**
* Returns the name of the given constant pool object, assuming it is of type CONSTANT_NameAndType, _FieldRef, _Methodref
* or _InterfaceMethodref.
*
* @param constant_pool
* constant pool of ClassFile.
* @param i
* index of cp_info entry in question.
* @return name of the associated object.
* @see CONSTANT_Utf8_info
*/
public static String getName(cp_info constant_pool[], int i) {
cp_info c = constant_pool[i];
switch (c.tag) {
case cp_info.CONSTANT_Utf8:
return c.toString(constant_pool);
case cp_info.CONSTANT_NameAndType:
return getName(constant_pool, ((CONSTANT_NameAndType_info) c).name_index);
case cp_info.CONSTANT_Fieldref:
return getName(constant_pool, ((CONSTANT_Fieldref_info) c).name_and_type_index);
case cp_info.CONSTANT_Methodref:
return getName(constant_pool, ((CONSTANT_Methodref_info) c).name_and_type_index);
case cp_info.CONSTANT_InterfaceMethodref:
return getName(constant_pool, ((CONSTANT_InterfaceMethodref_info) c).name_and_type_index);
}
logger.debug("Request for name for non-named object!");
return "Can't find name of that object. Sorry.";
}
/**
* Counts the number of parameters of the given method.
*
* @param constant_pool
* constant pool of ClassFile.
* @param m
* a constant pool index as accepted by getTypeDescr.
* @return the number of parameters.
* @see cp_info#getTypeDescr
*/
public static int countParams(cp_info constant_pool[], int m) {
StringTokenizer st;
String s = getTypeDescr(constant_pool, m);
s = ClassFile.parseMethodDesc_params(s);
st = new StringTokenizer(s, ",", false);
return st.countTokens();
}
/**
* Returns the type descriptor for the given constant pool object, which must be a CONSTANT_Utf8, CONSTANT_NameAndType,
* CONSTANT_Fieldref, CONSTANT_MethodRef, or CONSTANT_InterfaceMethodRef.
*
* @param constant_pool
* constant pool of ClassFile.
* @param i
* a constant pool index for an entry of type CONSTANT_Utf8, CONSTANT_NameAndType, CONSTANT_MethodRef, or
* CONSTANT_InterfaceMethodRef.
* @return the type descriptor.
* @see CONSTANT_Utf8_info
*/
public static String getTypeDescr(cp_info constant_pool[], int i) {
cp_info c = constant_pool[i];
if (c instanceof CONSTANT_Utf8_info) {
return c.toString(constant_pool);
}
if (c instanceof CONSTANT_NameAndType_info) {
return getTypeDescr(constant_pool, ((CONSTANT_NameAndType_info) c).descriptor_index);
}
if (c instanceof CONSTANT_Methodref_info) {
return getTypeDescr(constant_pool, ((CONSTANT_Methodref_info) c).name_and_type_index);
}
if (c instanceof CONSTANT_InterfaceMethodref_info) {
return getTypeDescr(constant_pool, ((CONSTANT_InterfaceMethodref_info) c).name_and_type_index);
}
if (c instanceof CONSTANT_Fieldref_info) {
return getTypeDescr(constant_pool, ((CONSTANT_Fieldref_info) c).name_and_type_index);
}
logger.debug("Invalid request for type descr!");
return "Invalid type descriptor request.";
}
/**
* Returns the name of the field type of the given constant pool object.
*
* @param constant_pool
* constant pool of ClassFile.
* @param i
* a constant pool index for an entry of type CONSTANT_Utf8, CONSTANT_NameAndType, or CONSTANT_FieldRef.
* @return the type of the field.
* @see CONSTANT_Utf8_info
* @see cp_info#getTypeDescr
*/
public static String fieldType(cp_info constant_pool[], int i) {
return ClassFile.parseDesc(getTypeDescr(constant_pool, i), "");
}
/**
* Creates an appropriate jimple representation of this constant. Field and method constants are assumed to point to static
* fields/methods.
*/
public abstract Value createJimpleConstantValue(cp_info[] constant_pool);
}
