Interpreter reworked and simplified

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@1112 379699f6-c40d-0410-875b-85095c16579e

jode/jode/expr/InvokeOperator.java.in

@@ -342,26 +342,25 @@ public final class InvokeOperator extends Operator
 
     class Environment extends SimpleRuntimeEnvironment {
 
+	Interpreter interpreter;
+	String classSig;
+
+	public Environment(String interpretedClassSig) {
+	    classSig = interpretedClassSig.intern();
+	}
+
 	public Object invokeMethod(Reference ref, boolean isVirtual, 
 				   Object cls, Object[] params) 
 	    throws InterpreterException, InvocationTargetException {
-	    if (ref.getClazz().equals
-		("L"+methodAnalyzer.getClazz().getName().replace('.','/')+";")) {
-		MethodType mt = (MethodType) Type.tType(ref.getType());
-		BytecodeInfo info = methodAnalyzer.getClassAnalyzer()
-		    .getMethod(ref.getName(), mt).getBytecodeInfo();
-		Value[] locals = new Value[info.getMaxLocals()];
-		for (int i=0; i< locals.length; i++)
-		    locals[i] = new Value();
-		int param = params.length;
-		int slot = 0;
-		if (cls != null)
-		    locals[slot++].setObject(cls);
-		for (int i = 0; i < param; i++) {
-		    locals[slot].setObject(params[i]);
-		    slot += mt.getParameterTypes()[i].stackSize();
-		}
-		return Interpreter.interpretMethod(this, info, locals); 
+	    if (cls == null && ref.getClazz().equals(classSig)) {
+		BytecodeInfo info = 
+		    ClassInfo.forName(ref.getClazz())
+		    .findMethod(ref.getName(), ref.getType())
+		    .getBytecode();
+		if (info != null)
+		    return interpreter.interpretMethod(info, null, params); 
+		throw new InterpreterException
+		    ("Can't interpret static native method: "+ref);
 	    } else
 		return super.invokeMethod(ref, isVirtual, cls, params);
 	}
@@ -372,15 +371,15 @@ public final class InvokeOperator extends Operator
 	MethodAnalyzer ma = clazz.getMethod(methodName, methodType);
 	if (ma == null)
 	    return null;
-	Environment env = new Environment();
-	BytecodeInfo info = ma.getBytecodeInfo();
-	Value[] locals = new Value[info.getMaxLocals()];
-	for (int i=0; i< locals.length; i++)
-	    locals[i] = new Value();
-	locals[0].setObject(op.getValue());
+	Environment env = new Environment("L"+methodAnalyzer.getClazz()
+					  .getName().replace('.','/')+";");
+	Interpreter interpreter = new Interpreter(env);
+	env.interpreter = interpreter;
+
 	String result;
 	try {
-	    result = (String) Interpreter.interpretMethod(env, info, locals);
+	    result = (String) interpreter.interpretMethod
+		(ma.getBytecodeInfo(), null, new String[] { op.getValue() });
 	} catch (InterpreterException ex) {
 	    GlobalOptions.err.println("Warning: Can't interpret method "
 				      +methodName);

jode/jode/jvm/Interpreter.java.in

@@ -25,11 +25,11 @@ import jode.bytecode.Handler;
 import jode.bytecode.Instruction;
 import jode.bytecode.Opcodes;
 import jode.bytecode.Reference;
-import jode.type.MethodType;
-import jode.type.Type;
+import jode.bytecode.TypeSignature;
 
 import java.lang.reflect.Array;
 import java.lang.reflect.InvocationTargetException;
+import @COLLECTIONS@.Arrays;
 
 /**
  * This class is a java virtual machine written in java :-).  Well not
@@ -53,14 +53,55 @@ public class Interpreter implements Opcodes {
     private final static int CMP_EQUAL_MASK
 	= (1 << CMP_GE)|(1 << CMP_LE)|(1 << CMP_EQ);
 
-    public static Object interpretMethod
-	(RuntimeEnvironment env, BytecodeInfo code, Value[] locals)
+    private RuntimeEnvironment env;
+
+    public Interpreter(RuntimeEnvironment env) {
+	this.env = env;
+    }
+
+    private Value[] fillParameters(BytecodeInfo code, 
+				   Object cls, Object[] params) {
+	Value[] locals = new Value[code.getMaxLocals()];
+	for (int i=0; i< locals.length; i++)
+	    locals[i] = new Value();
+
+	String myType = code.getMethodInfo().getType();
+	String[] myParamTypes = TypeSignature.getParameterTypes(myType);
+	int slot = 0;
+	if (!code.getMethodInfo().isStatic())
+	    locals[slot++].setObject(cls);
+	for (int i=0; i< myParamTypes.length; i++) {
+	    char type = myParamTypes[i].charAt(0);
+	    switch ("ZBSC".indexOf(type)) {
+	    case 0:
+		locals[slot].setInt(((Boolean) params[i])
+				    .booleanValue() ? 1 : 0);
+		break;
+	    case 1: case 2:
+		locals[slot].setInt(((Number) params[i]).intValue());
+		break;
+	    case 3:
+		locals[slot].setInt(((Character) params[i]).charValue());
+		break;
+	    default:
+		locals[slot].setObject(params[i]);
+		break;
+	    }
+	    slot += TypeSignature.getTypeSize(myParamTypes[i]);
+	}
+	return locals;
+    }
+
+    public Object interpretMethod(BytecodeInfo code, 
+				  Object instance, Object[] myParams)
 	throws InterpreterException, InvocationTargetException {
 	if ((GlobalOptions.debuggingFlags 
 	     & GlobalOptions.DEBUG_INTERPRT) != 0)
 	    GlobalOptions.err.println("Interpreting "+code);
+
+	Value[] locals = fillParameters(code, instance, myParams);
 	Value[] stack = new Value[code.getMaxStack()];
-	for (int i=0; i< stack.length; i++)
+	for (int i=0; i < stack.length; i++)
 	    stack[i] = new Value();
 
 	Instruction pc = (Instruction) code.getInstructions().get(0);
@@ -78,7 +119,8 @@ public class Interpreter implements Opcodes {
 			    GlobalOptions.err.print(",");
 			GlobalOptions.err.print(stack[i]);
 			if (stack[i].objectValue() instanceof char[]) {
-			    GlobalOptions.err.print(new String((char[])stack[i].objectValue()));
+			    GlobalOptions.err.print
+				(new String((char[])stack[i].objectValue()));
 			}
 		    }
 		    GlobalOptions.err.println("]");
@@ -563,16 +605,31 @@ public class Interpreter implements Opcodes {
 		case opc_lookupswitch: {
 		    int value = stack[--stacktop].intValue();
 		    int[] values = instr.getValues();
-		    pc = instr.getSuccs()[values.length];
-		    for (int i=0; i< values.length; i++) {
-			if (values[i] == value) {
-			    pc = instr.getSuccs()[i];
-			    break;
-			}
-		    }
+		    int pos = Arrays.binarySearch(values, value);
+		    pc = pos < 0
+			? instr.getSuccs()[values.length]
+			: instr.getSuccs()[pos];
 		    break;
 		}
-		case opc_ireturn: case opc_freturn: case opc_areturn:
+		case opc_ireturn: {
+		    Object result = stack[--stacktop].objectValue();
+		    String retType = TypeSignature
+			.getReturnType(code.getMethodInfo().getType());
+		    switch ("ZBSC".indexOf(retType.charAt(0))) {
+		    case 0: // boolean
+			return new Boolean(((Integer)result).intValue() != 0);
+		    case 1: // byte
+			return new Byte(((Integer)result).byteValue());
+		    case 2: // short
+			return new Short(((Integer)result).shortValue());
+		    case 3: // char
+			return new Character((char) 
+					     ((Integer)result).intValue());
+		    default: // integer
+			return result;
+		    }
+		}
+		case opc_freturn: case opc_areturn:
 		    return stack[--stacktop].objectValue();
 		case opc_lreturn: case opc_dreturn:
 		    return stack[stacktop -= 2].objectValue();
@@ -580,34 +637,100 @@ public class Interpreter implements Opcodes {
 		    return Void.TYPE;
 		case opc_getstatic: {
 		    Reference ref = instr.getReference();
-		    stack[stacktop].setObject
-			(env.getField(instr.getReference(), null));
-		    stacktop += Type.tType(ref.getType()).stackSize();
+		    Object result = env.getField(instr.getReference(), null);
+		    char type = ref.getType().charAt(0);
+		    switch ("ZBSC".indexOf(type)) {
+		    case 0:
+			stack[stacktop].setInt(((Boolean) result)
+					       .booleanValue() ? 1 : 0);
+			break;
+		    case 1: case 2:
+			stack[stacktop].setInt(((Number) result)
+					       .intValue());
+			break;
+		    case 3:
+			stack[stacktop].setInt(((Character) result)
+					       .charValue());
+			break;
+		    default:
+			stack[stacktop].setObject(result);
+			break;
+		    }
+		    stacktop += TypeSignature.getTypeSize(ref.getType());
 		    break;
 		}
 		case opc_getfield: {
 		    Reference ref = instr.getReference();
-		    Object cls = stack[--stacktop];
+		    Object cls = stack[--stacktop].objectValue();
 		    if (cls == null)
 			throw new InvocationTargetException
 			    (new NullPointerException());
-		    stack[stacktop].setObject
-			(env.getField(instr.getReference(), cls));
-		    stacktop += Type.tType(ref.getType()).stackSize();
+		    Object result = env.getField(instr.getReference(), cls);
+		    char type = ref.getType().charAt(0);
+		    switch ("ZBSC".indexOf(type)) {
+		    case 0:
+			stack[stacktop].setInt(((Boolean) result)
+					       .booleanValue() ? 1 : 0);
+			break;
+		    case 1: case 2:
+			stack[stacktop].setInt(((Number) result)
+					       .intValue());
+			break;
+		    case 3:
+			stack[stacktop].setInt(((Character) result)
+					       .charValue());
+			break;
+		    default:
+			stack[stacktop].setObject(result);
+			break;
+		    }
+		    stacktop += TypeSignature.getTypeSize(ref.getType());
 		    break;
 		}
 		case opc_putstatic: {
 		    Reference ref = instr.getReference();
-		    stacktop -= Type.tType(ref.getType()).stackSize();
-		    Object value = stack[stacktop];
+		    stacktop -= TypeSignature.getTypeSize(ref.getType());
+		    Object value = stack[stacktop].objectValue();
+		    int type = "ZBSC".indexOf(ref.getType().charAt(0));
+		    switch(type) {
+		    case 0: // boolean
+			value = new Boolean(((Integer)value).intValue() != 0);
+			break;
+		    case 1: // byte
+			value = new Byte(((Integer)value).byteValue());
+			break;
+		    case 2: // short
+			value = new Short(((Integer)value).shortValue());
+			break;
+		    case 3: // char
+			value = new Character((char) 
+					      ((Integer)value).intValue());
+			break;
+		    }
 		    env.putField(instr.getReference(), null, value);
 		    break;
 		}
 		case opc_putfield: {
 		    Reference ref = instr.getReference();
-		    stacktop -= Type.tType(ref.getType()).stackSize();
-		    Object value = stack[stacktop];
-		    Object cls = stack[--stacktop];
+		    stacktop -= TypeSignature.getTypeSize(ref.getType());
+		    Object value = stack[stacktop].objectValue();
+		    int type = "ZBSC".indexOf(ref.getType().charAt(0));
+		    switch(type) {
+		    case 0: // boolean
+			value = new Boolean(((Integer)value).intValue() != 0);
+			break;
+		    case 1: // byte
+			value = new Byte(((Integer)value).byteValue());
+			break;
+		    case 2: // short
+			value = new Short(((Integer)value).shortValue());
+			break;
+		    case 3: // char
+			value = new Character((char)
+					      ((Integer)value).intValue());
+			break;
+		    }
+		    Object cls = stack[--stacktop].objectValue();
 		    if (cls == null)
 			throw new InvocationTargetException
 			    (new NullPointerException());
@@ -619,11 +742,30 @@ public class Interpreter implements Opcodes {
 		case opc_invokestatic :
 		case opc_invokeinterface: {
 		    Reference ref = instr.getReference();
-		    MethodType mt = (MethodType) Type.tType(ref.getType());
-		    Object[] args = new Object[mt.getParameterTypes().length];
-		    for (int i=args.length - 1; i >= 0; i--) {
-			stacktop -= mt.getParameterTypes()[i].stackSize();
-			args[i] = stack[stacktop].objectValue();
+		    String[] paramTypes
+			= TypeSignature.getParameterTypes(ref.getType());
+		    Object[] args = new Object[paramTypes.length];
+		    for (int i = paramTypes.length - 1; i >= 0; i--) {
+			stacktop -= TypeSignature.getTypeSize(paramTypes[i]);
+			Object value = stack[stacktop].objectValue();
+			int type = "ZBSC".indexOf(paramTypes[i].charAt(0));
+			switch(type) {
+			case 0: // boolean
+			    value = new Boolean(((Integer)value)
+						.intValue() != 0);
+			    break;
+			case 1: // byte
+			    value = new Byte(((Integer)value).byteValue());
+			    break;
+			case 2: // short
+			    value = new Short(((Integer)value).shortValue());
+			    break;
+			case 3: // char
+			    value = new Character((char)
+						  ((Integer)value).intValue());
+			    break;
+			}
+			args[i] = value;
 		    }
 		
 		    Object result = null;
@@ -643,10 +785,29 @@ public class Interpreter implements Opcodes {
 			result = env.invokeMethod
 			    (ref, opcode != opc_invokespecial, cls, args);
 		    }
-		    if (mt.getReturnType() != Type.tVoid) {
+		    String retType
+			= TypeSignature.getReturnType(ref.getType());
+		    char type = retType.charAt(0);
+		    switch ("ZBSCV".indexOf(type)) {
+		    case 0:
+			stack[stacktop].setInt(((Boolean) result)
+					       .booleanValue() ? 1 : 0);
+			break;
+		    case 1: case 2:
+			stack[stacktop].setInt(((Number) result)
+					       .intValue());
+			break;
+		    case 3:
+			stack[stacktop].setInt(((Character) result)
+					       .charValue());
+			break;
+		    case 4: // Void
+			break;
+		    default:
 			stack[stacktop].setObject(result);
-			stacktop += mt.getReturnType().stackSize();
+			break;
 		    }
+		    stacktop += TypeSignature.getTypeSize(retType);
 		    break;
 		}
 		case opc_new: {

jode/jode/jvm/RuntimeEnvironment.java

@@ -21,11 +21,56 @@ package jode.jvm;
 import jode.bytecode.Reference;
 import java.lang.reflect.InvocationTargetException;
 
+/**
+ * This interface is used by the Interpreter to actually modify objects,
+ * invoke methods, etc. <br>
+ *
+ * The objects used in this runtime environment need not to be of the
+ * real class, but could also be of some wrapper class.  The only
+ * exception are arrays, which must be arrays (but not necessarily of
+ * the real element type). <br>
+ * 
+ * @author Jochen Hoenicke */
 public interface RuntimeEnvironment {
+    /**
+     * Get the value of a field member.
+     * @param fieldref the Reference of the field.
+     * @param obj the object of which the field should be taken, null
+     * if the field is static.
+     * @return the field value.  Primitive types are wrapped to 
+     * Object.
+     * @exception InterpreterException if the field does not exists, the
+     * object is not supported etc.
+     */
     public Object getField(Reference fieldref, Object obj)
 	throws InterpreterException;
+
+    /**
+     * Set the value of a field member.
+     * @param fieldref the Reference of the field.
+     * @param obj the object of which the field should be taken, null
+     * if the field is static.
+     * @param value the field value.  Primitive types are wrapped to 
+     * Object.
+     * @exception InterpreterException if the field does not exists, the
+     * object is not supported etc.
+     */
     public void putField(Reference fieldref, Object obj, Object value)
 	throws InterpreterException;
+
+
+    /**
+     * Invoke a method.
+     * @param methodRef the reference to the method.
+     * @param isVirtual true, iff the call is virtual
+     * @param cls the object on which the method should be called, null
+     * if the method is static.
+     * @param params the params of the method.  Primitive types are
+     * wrapped to Object.
+     * @return the return value of the method.  Primitive types are
+     * wrapped to Object,  void type is ignored, may be null.
+     * @exception InterpreterException if the field does not exists, the
+     * object is not supported etc.  */
     public Object invokeMethod(Reference methodRef, boolean isVirtual, 
 			       Object cls, Object[] params)
 	throws InterpreterException, InvocationTargetException;
@@ -43,3 +88,5 @@ public interface RuntimeEnvironment {
     public void exitMonitor(Object obj)
 	throws InterpreterException;
 }
+
+

jode/jode/jvm/SimpleRuntimeEnvironment.java

@@ -154,24 +154,6 @@ public class SimpleRuntimeEnvironment implements RuntimeEnvironment {
 		(ref+": Security exception");
 	}
 	try {
-	    Type[] paramTypes = mt.getParameterTypes();
-	    for (int i = 0; i< paramTypes.length; i++) {
-		if (paramTypes[i] instanceof IntegerType
-		    && paramTypes[i] != Type.tInt) {
-		    int value = ((Integer) params[i]).intValue();
-		    if (paramTypes[i] == Type.tBoolean) {
-			params[i] = value != 0 ? Boolean.TRUE : Boolean.FALSE;
-		    } else if (paramTypes[i] == Type.tChar) {
-			params[i] = new Character((char) value);
-		    } else if (paramTypes[i] == Type.tByte) {
-			params[i] = new Byte((byte) value);
-		    } else if (paramTypes[i] == Type.tShort) {
-			params[i] = new Short((short) value);
-		    } else
-			throw new AssertError("Unknown integer type: "
-					      +paramTypes[i]);
-		}
-	    }
 	    return m.invoke(cls, params);
 	} catch (IllegalAccessException ex) {
 	    throw new InterpreterException

jode/jode/obfuscator/ConstantRuntimeEnvironment.java

@@ -18,7 +18,9 @@
  */
 
 package jode.obfuscator;
-import jode.jvm.*;
+import jode.jvm.Interpreter;
+import jode.jvm.SimpleRuntimeEnvironment;
+import jode.jvm.InterpreterException;
 import jode.bytecode.Reference;
 import jode.bytecode.BytecodeInfo;
 import jode.type.*;
@@ -213,8 +215,11 @@ public class ConstantRuntimeEnvironment extends SimpleRuntimeEnvironment {
 	addWhite(Reference.getReference
 		 ("Ljava/lang/Math;", "PI", "D"));
     }
+
+    private Interpreter interpreter;
     
     public ConstantRuntimeEnvironment() {
+	interpreter = new Interpreter(this);
     }
 
     public Object getField(Reference ref, Object obj)
@@ -235,7 +240,7 @@ public class ConstantRuntimeEnvironment extends SimpleRuntimeEnvironment {
 
     public void putField(Reference ref, Object obj, Object value)
 	throws InterpreterException {
-	throw new InterpreterException("Modifiing Field " + ref + ".");
+	throw new InterpreterException("Modifying Field " + ref + ".");
     }
     
     public Object invokeConstructor(Reference ref, Object[] params)
@@ -255,20 +260,8 @@ public class ConstantRuntimeEnvironment extends SimpleRuntimeEnvironment {
 	    = (MethodIdentifier) Main.getClassBundle().getIdentifier(ref);
 	if (mi != null) {
 	    BytecodeInfo code = mi.info.getBytecode();
-	    if (code != null) {
-		MethodType mt = (MethodType) Type.tType(ref.getType());
-		Value[] locals = new Value[code.getMaxLocals()];
-		for (int i=0; i< locals.length; i++)
-		    locals[i] = new Value();
-		int slot = 0;
-		if (cls != null)
-		    locals[slot++].setObject(cls);
-		for (int i = 0; i < params.length; i++) {
-		    locals[slot].setObject(params[i]);
-		    slot += mt.getParameterTypes()[i].stackSize();
-		}
-		return Interpreter.interpretMethod(this, code, locals);
-	    }
+	    if (code != null)
+		return interpreter.interpretMethod(code, cls, params);
 	}
 	throw new InterpreterException("Invoking library method " + ref + ".");
     }