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package serp.bytecode;
import java.io.*;
import java.lang.reflect.*;
import serp.bytecode.lowlevel.*;
import serp.bytecode.visitor.*;
import serp.util.*;
/**
* An instruction that invokes a method.
*
* @author Abe White
*/
public class MethodInstruction extends Instruction {
private int _index = 0;
MethodInstruction(Code owner, int opcode) {
super(owner, opcode);
}
int getLength() {
if (getOpcode() == Constants.INVOKEINTERFACE)
return super.getLength() + 4;
return super.getLength() + 2;
}
public int getLogicalStackChange() {
String ret = getMethodReturnName();
if (ret == null)
return 0;
// subtract a stack pos for the this ptr
int stack = 0;
if (getOpcode() != Constants.INVOKESTATIC)
stack--;
// and for each arg
String[] params = getMethodParamNames();
for (int i = 0; i < params.length; i++)
stack--;
// add for the return value, if any
if (!void.class.getName().equals(ret))
stack++;
return stack;
}
public int getStackChange() {
String ret = getMethodReturnName();
if (ret == null)
return 0;
// subtract a stack pos for the this ptr
int stack = 0;
if (getOpcode() != Constants.INVOKESTATIC)
stack--;
// and for each arg (2 for longs, doubles)
String[] params = getMethodParamNames();
for (int i = 0; i < params.length; i++, stack--)
if (long.class.getName().equals(params[i])
|| double.class.getName().equals(params[i]))
stack--;
// add for the return value, if any
if (!void.class.getName().equals(ret))
stack++;
if (long.class.getName().equals(ret)
|| double.class.getName().equals(ret))
stack++;
return stack;
}
/////////////////////
// Method operations
/////////////////////
/**
* Return the index in the class {@link ConstantPool} of the
* {@link ComplexEntry} describing the method to operate on.
*/
public int getMethodIndex() {
return _index;
}
/**
* Set the index in the class {@link ConstantPool} of the
* {@link ComplexEntry} describing the method to operate on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodIndex(int index) {
_index = index;
return this;
}
/**
* Return the method this instruction operates on, or null if not set.
*/
public BCMethod getMethod() {
String dec = getMethodDeclarerName();
if (dec == null)
return null;
BCClass bc = getProject().loadClass(dec, getClassLoader());
BCMethod[] meths = bc.getMethods(getMethodName(),getMethodParamNames());
if (meths.length == 0)
return null;
return meths[0];
}
/**
* Set the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(BCMethod method) {
if (method == null)
return setMethodIndex(0);
return setMethod(method.getDeclarer().getName(), method.getName(),
method.getReturnName(), method.getParamNames(), false);
}
/**
* Set the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(Method method) {
if (method == null)
return setMethodIndex(0);
return setMethod(method.getDeclaringClass(), method.getName(),
method.getReturnType(), method.getParameterTypes());
}
/**
* Set the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(Constructor method) {
if (method == null)
return setMethodIndex(0);
setOpcode(Constants.INVOKESPECIAL);
return setMethod(method.getDeclaringClass(), "", void.class,
method.getParameterTypes());
}
/**
* Set the method this instruction operates on.
*
* @param dec the full class name of the method's declaring class
* @param name the method name
* @param returnType the full class name of the method return type
* @param param the full class names of the method param types
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(String dec, String name,
String returnType, String[] params) {
return setMethod(dec, name, returnType, params, true);
}
/**
* Set the method this instruction operates on.
*
* @param dec the full class name of the method's declaring class
* @param name the method name
* @param returnType the full class name of the method return type
* @param param the full class names of the method param types
* @param copy whether to copy the the parameter array
* @return this instruction, for method chaining
*/
private MethodInstruction setMethod(String dec, String name,
String returnType, String[] params, boolean copy) {
if (name == null && returnType == null && dec == null
&& (params == null || params.length == 0))
return setMethodIndex(0);
if (dec == null)
dec = "";
if (name == null)
name = "";
if (returnType == null)
returnType = "";
if (params == null)
params = new String[0];
else if (copy) {
String[] pcopy = new String[params.length];
System.arraycopy(params, 0, pcopy, 0, params.length);
params = pcopy;
}
NameCache cache = getProject().getNameCache();
returnType = cache.getInternalForm(returnType, true);
dec = cache.getInternalForm(dec, false);
for (int i = 0; i < params.length; i++)
params[i] = cache.getInternalForm(params[i], true);
String desc = cache.getDescriptor(returnType, params);
if (getOpcode() == Constants.INVOKEINTERFACE)
return setMethodIndex(getPool().findInterfaceMethodEntry(dec, name,
desc, true));
return setMethodIndex(getPool().findMethodEntry(dec, name, desc, true));
}
/**
* Set the method this instruction operates on, for methods that are
* declared by the current class.
*
* @param name the method name
* @param returnType the full class name of the method return type
* @param param the full class names of the method param types
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(String name, String returnType,
String[] params) {
BCClass owner = getCode().getMethod().getDeclarer();
return setMethod(owner.getName(), name, returnType, params);
}
/**
* Set the method this instruction operates on.
*
* @param dec the method's declaring class
* @param name the method name
* @param returnType the class of the method return type
* @param param the class of the method param types
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(Class dec, String name,
Class returnType, Class[] params) {
String decName = (dec == null) ? null : dec.getName();
String returnName = (returnType == null) ? null : returnType.getName();
String[] paramNames = null;
if (params != null) {
paramNames = new String[params.length];
for (int i = 0; i < params.length; i++)
paramNames[i] = params[i].getName();
}
return setMethod(decName, name, returnName, paramNames, false);
}
/**
* Set the method this instruction operates on, for methods that are
* declared by the current class.
*
* @param name the method name
* @param returnType the class of the method return type
* @param param the class of the method param types
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(String name, Class returnType,
Class[] params) {
BCClass owner = getCode().getMethod().getDeclarer();
String returnName = (returnType == null) ? null : returnType.getName();
String[] paramNames = null;
if (params != null) {
paramNames = new String[params.length];
for (int i = 0; i < params.length; i++)
paramNames[i] = params[i].getName();
}
return setMethod(owner.getName(), name, returnName, paramNames, false);
}
/**
* Set the method this instruction operates on.
*
* @param dec the method's declaring class
* @param name the method name
* @param returnType the class of the method return type
* @param param the class of the method param types
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(BCClass dec, String name,
BCClass returnType, BCClass[] params) {
String decName = (dec == null) ? null : dec.getName();
String returnName = (returnType == null) ? null : returnType.getName();
String[] paramNames = null;
if (params != null) {
paramNames = new String[params.length];
for (int i = 0; i < params.length; i++)
paramNames[i] = params[i].getName();
}
return setMethod(decName, name, returnName, paramNames, false);
}
/**
* Set the method this instruction operates on, for methods that are
* declared by the current class.
*
* @param name the method name
* @param returnType the class of the method return type
* @param param the class of the method param types
* @return this instruction, for method chaining
*/
public MethodInstruction setMethod(String name, BCClass returnType,
BCClass[] params) {
BCClass owner = getCode().getMethod().getDeclarer();
String returnName = (returnType == null) ? null : returnType.getName();
String[] paramNames = null;
if (params != null) {
paramNames = new String[params.length];
for (int i = 0; i < params.length; i++)
paramNames[i] = params[i].getName();
}
return setMethod(owner.getName(), name, returnName, paramNames, false);
}
/////////////////////////////////////////
// Name, Return, Param, Owner operations
/////////////////////////////////////////
/**
* Return the name of the method this instruction operates on, or null
* if not set.
*/
public String getMethodName() {
if (_index == 0)
return null;
ComplexEntry entry = (ComplexEntry) getPool().getEntry(_index);
String name = entry.getNameAndTypeEntry().getNameEntry().getValue();
if (name.length() == 0)
return null;
return name;
}
/**
* Set the name of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodName(String name) {
return setMethod(getMethodDeclarerName(), name, getMethodReturnName(),
getMethodParamNames());
}
/**
* Return the return type of the method this instruction operates on,
* or null if not set.
*/
public String getMethodReturnName() {
if (_index == 0)
return null;
ComplexEntry entry = (ComplexEntry) getPool().getEntry(_index);
String desc = entry.getNameAndTypeEntry().getDescriptorEntry().
getValue();
NameCache cache = getProject().getNameCache();
String name = cache.getExternalForm(cache.getDescriptorReturnName(desc),
false);
if (name.length() == 0)
return null;
return name;
}
/**
* Return the return type of the method this instruction operates on,
* or null if not set.
*/
public Class getMethodReturnType() {
String type = getMethodReturnName();
if (type == null)
return null;
return Strings.toClass(type, getClassLoader());
}
/**
* Return the return type of the method this instruction operates on,
* or null if not set.
*/
public BCClass getMethodReturnBC() {
String type = getMethodReturnName();
if (type == null)
return null;
return getProject().loadClass(type, getClassLoader());
}
/**
* Set the return type of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodReturn(String type) {
return setMethod(getMethodDeclarerName(), getMethodName(), type,
getMethodParamNames());
}
/**
* Set the return type of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodReturn(Class type) {
String name = null;
if (type != null)
name = type.getName();
return setMethodReturn(name);
}
/**
* Set the return type of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodReturn(BCClass type) {
String name = null;
if (type != null)
name = type.getName();
return setMethodReturn(name);
}
/**
* Return the param types of the method this instruction operates on,
* or empty array if none.
*/
public String[] getMethodParamNames() {
if (_index == 0)
return new String[0];
ComplexEntry entry = (ComplexEntry) getPool().getEntry(_index);
String desc = entry.getNameAndTypeEntry().getDescriptorEntry().
getValue();
NameCache cache = getProject().getNameCache();
String[] names = cache.getDescriptorParamNames(desc);
for (int i = 0; i < names.length; i++)
names[i] = cache.getExternalForm(names[i], false);
return names;
}
/**
* Return the param types of the method this instruction operates on,
* or empty array if none.
*/
public Class[] getMethodParamTypes() {
String[] paramNames = getMethodParamNames();
Class[] params = new Class[paramNames.length];
for (int i = 0; i < paramNames.length; i++)
params[i] = Strings.toClass(paramNames[i], getClassLoader());
return params;
}
/**
* Return the param types of the method this instruction operates on,
* or empty array if none.
*/
public BCClass[] getMethodParamBCs() {
String[] paramNames = getMethodParamNames();
BCClass[] params = new BCClass[paramNames.length];
for (int i = 0; i < paramNames.length; i++)
params[i] = getProject().loadClass(paramNames[i], getClassLoader());
return params;
}
/**
* Set the param types of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodParams(String[] types) {
return setMethod(getMethodDeclarerName(), getMethodName(),
getMethodReturnName(), types);
}
/**
* Set the param types of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public void setMethodParams(Class[] types) {
if (types == null)
setMethodParams((String[]) null);
else {
String[] names = new String[types.length];
for (int i = 0; i < types.length; i++)
names[i] = types[i].getName();
setMethodParams(names);
}
}
/**
* Set the param types of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public void setMethodParams(BCClass[] types) {
if (types == null)
setMethodParams((String[]) null);
else {
String[] names = new String[types.length];
for (int i = 0; i < types.length; i++)
names[i] = types[i].getName();
setMethodParams(names);
}
}
/**
* Return the declaring type of the method this instruction operates on,
* or null if not set.
*/
public String getMethodDeclarerName() {
if (_index == 0)
return null;
ComplexEntry entry = (ComplexEntry) getPool().getEntry(_index);
String name = getProject().getNameCache().getExternalForm
(entry.getClassEntry().getNameEntry().getValue(), false);
if (name.length() == 0)
return null;
return name;
}
/**
* Return the declaring type of the method this instruction operates on,
* or null if not set.
*/
public Class getMethodDeclarerType() {
String type = getMethodDeclarerName();
if (type == null)
return null;
return Strings.toClass(type, getClassLoader());
}
/**
* Return the declaring type of the method this instruction operates on,
* or null if not set.
*/
public BCClass getMethodDeclarerBC() {
String type = getMethodDeclarerName();
if (type == null)
return null;
return getProject().loadClass(type, getClassLoader());
}
/**
* Set the declaring type of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodDeclarer(String type) {
return setMethod(type, getMethodName(), getMethodReturnName(),
getMethodParamNames());
}
/**
* Set the declaring type of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodDeclarer(Class type) {
String name = null;
if (type != null)
name = type.getName();
return setMethodDeclarer(name);
}
/**
* Set the declaring type of the method this instruction operates on.
*
* @return this instruction, for method chaining
*/
public MethodInstruction setMethodDeclarer(BCClass type) {
String name = null;
if (type != null)
name = type.getName();
return setMethodDeclarer(name);
}
/**
* MethodInstructions are equal if the method they reference is the same,
* or if the method of either is unset.
*/
public boolean equalsInstruction(Instruction other) {
if (other == this)
return true;
if (!(other instanceof MethodInstruction))
return false;
if (!super.equalsInstruction(other))
return false;
MethodInstruction ins = (MethodInstruction) other;
String s1 = getMethodName();
String s2 = ins.getMethodName();
if (!(s1 == null || s2 == null || s1.equals(s2)))
return false;
s1 = getMethodReturnName();
s2 = ins.getMethodReturnName();
if (!(s1 == null || s2 == null || s1.equals(s2)))
return false;
s1 = getMethodDeclarerName();
s2 = ins.getMethodDeclarerName();
if (!(s1 == null || s2 == null || s1.equals(s2)))
return false;
String[] p1 = getMethodParamNames();
String[] p2 = ins.getMethodParamNames();
if (!(p1.length == 0 || p2.length == 0 || p1.length == p2.length))
return false;
for (int i = 0; i < p1.length; i++)
if (!(p1[i] == null || p2[i] == null || p1[i].equals(p2[i])))
return false;
return true;
}
public void acceptVisit(BCVisitor visit) {
visit.enterMethodInstruction(this);
visit.exitMethodInstruction(this);
}
void read(Instruction orig) {
super.read(orig);
MethodInstruction ins = (MethodInstruction) orig;
setMethod(ins.getMethodDeclarerName(), ins.getMethodName(),
ins.getMethodReturnName(), ins.getMethodParamNames());
}
void read(DataInput in) throws IOException {
super.read(in);
_index = in.readUnsignedShort();
if (getOpcode() == Constants.INVOKEINTERFACE) {
in.readByte();
in.readByte();
}
}
void write(DataOutput out) throws IOException {
super.write(out);
out.writeShort(_index);
if (getOpcode() == Constants.INVOKEINTERFACE) {
String[] args = getMethodParamNames();
int count = 1;
for (int i = 0; i < args.length; i++, count++)
if (long.class.getName().equals(args[i])
|| double.class.getName().equals(args[i]))
count++;
out.writeByte(count);
out.writeByte(0);
}
}
}
