/**
* Generates code to return a Java type, after calling a Java method that returns the same type.
* Generates the appropriate RETURN bytecode.
*/
private static void generatePopResult(ClassFileWriter cfw, Class<?> retType) {
if (retType.isPrimitive()) {
String typeName = retType.getName();
switch (typeName.charAt(0)) {
case 'b':
case 'c':
case 's':
case 'i':
case 'z':
cfw.add(ByteCode.IRETURN);
break;
case 'l':
cfw.add(ByteCode.LRETURN);
break;
case 'f':
cfw.add(ByteCode.FRETURN);
break;
case 'd':
cfw.add(ByteCode.DRETURN);
break;
}
} else {
cfw.add(ByteCode.ARETURN);
}
}
/**
* Generates a method called "super$methodName()" which can be called from JavaScript that is
* equivalent to calling "super.methodName()" from Java. Eventually, this may be supported
* directly in JavaScript.
*/
private static void generateSuper(
ClassFileWriter cfw,
String genName,
String superName,
String methodName,
String methodSignature,
Class<?>[] parms,
Class<?> returnType) {
cfw.startMethod("super$" + methodName, methodSignature, ClassFileWriter.ACC_PUBLIC);
// push "this"
cfw.add(ByteCode.ALOAD, 0);
// push the rest of the parameters.
int paramOffset = 1;
for (Class<?> parm : parms) {
paramOffset += generatePushParam(cfw, paramOffset, parm);
}
// call the superclass implementation of the method.
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, methodName, methodSignature);
// now, handle the return type appropriately.
Class<?> retType = returnType;
if (!retType.equals(Void.TYPE)) {
generatePopResult(cfw, retType);
} else {
cfw.add(ByteCode.RETURN);
}
cfw.stopMethod((short) (paramOffset + 1));
}
/**
* Generates code to wrap Java arguments into Object[]. Non-primitive Java types are left as-is
* pending conversion in the helper method. Leaves the array object on the top of the stack.
*/
static void generatePushWrappedArgs(ClassFileWriter cfw, Class<?>[] argTypes, int arrayLength) {
// push arguments
cfw.addPush(arrayLength);
cfw.add(ByteCode.ANEWARRAY, "java/lang/Object");
int paramOffset = 1;
for (int i = 0; i != argTypes.length; ++i) {
cfw.add(ByteCode.DUP); // duplicate array reference
cfw.addPush(i);
paramOffset += generateWrapArg(cfw, paramOffset, argTypes[i]);
cfw.add(ByteCode.AASTORE);
}
}
private static void generateSerialCtor(
ClassFileWriter cfw, String adapterName, String superName) {
cfw.startMethod(
"<init>",
"(Lorg/mozilla/javascript/ContextFactory;"
+ "Lorg/mozilla/javascript/Scriptable;"
+ "Lorg/mozilla/javascript/Scriptable;"
+ ")V",
ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", "()V");
// Save parameter in instance variable "factory"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_1); // first arg: ContextFactory instance
cfw.add(ByteCode.PUTFIELD, adapterName, "factory", "Lorg/mozilla/javascript/ContextFactory;");
// Save parameter in instance variable "delegee"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_2); // second arg: Scriptable delegee
cfw.add(ByteCode.PUTFIELD, adapterName, "delegee", "Lorg/mozilla/javascript/Scriptable;");
// save self
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_3); // third arg: Scriptable self
cfw.add(ByteCode.PUTFIELD, adapterName, "self", "Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.RETURN);
cfw.stopMethod((short) 4); // 4: this + factory + delegee + self
}
private static void generateCtor(ClassFileWriter cfw, String adapterName, String superName) {
cfw.startMethod(
"<init>",
"(Lorg/mozilla/javascript/ContextFactory;" + "Lorg/mozilla/javascript/Scriptable;)V",
ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", "()V");
// Save parameter in instance variable "factory"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_1); // first arg: ContextFactory instance
cfw.add(ByteCode.PUTFIELD, adapterName, "factory", "Lorg/mozilla/javascript/ContextFactory;");
// Save parameter in instance variable "delegee"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_2); // second arg: Scriptable delegee
cfw.add(ByteCode.PUTFIELD, adapterName, "delegee", "Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.ALOAD_0); // this for the following PUTFIELD for self
// create a wrapper object to be used as "this" in method calls
cfw.add(ByteCode.ALOAD_2); // the Scriptable delegee
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/JavaAdapter",
"createAdapterWrapper",
"(Lorg/mozilla/javascript/Scriptable;"
+ "Ljava/lang/Object;"
+ ")Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.PUTFIELD, adapterName, "self", "Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.RETURN);
cfw.stopMethod((short) 3); // 3: this + factory + delegee
}
private static void generateMethod(
ClassFileWriter cfw,
String genName,
String methodName,
Class<?>[] parms,
Class<?> returnType,
boolean convertResult) {
StringBuilder sb = new StringBuilder();
int paramsEnd = appendMethodSignature(parms, returnType, sb);
String methodSignature = sb.toString();
cfw.startMethod(methodName, methodSignature, ClassFileWriter.ACC_PUBLIC);
// Prepare stack to call method
// push factory
cfw.add(ByteCode.ALOAD_0);
cfw.add(ByteCode.GETFIELD, genName, "factory", "Lorg/mozilla/javascript/ContextFactory;");
// push self
cfw.add(ByteCode.ALOAD_0);
cfw.add(ByteCode.GETFIELD, genName, "self", "Lorg/mozilla/javascript/Scriptable;");
// push function
cfw.add(ByteCode.ALOAD_0);
cfw.add(ByteCode.GETFIELD, genName, "delegee", "Lorg/mozilla/javascript/Scriptable;");
cfw.addPush(methodName);
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/JavaAdapter",
"getFunction",
"(Lorg/mozilla/javascript/Scriptable;"
+ "Ljava/lang/String;"
+ ")Lorg/mozilla/javascript/Function;");
// push arguments
generatePushWrappedArgs(cfw, parms, parms.length);
// push bits to indicate which parameters should be wrapped
if (parms.length > 64) {
// If it will be an issue, then passing a static boolean array
// can be an option, but for now using simple bitmask
throw Context.reportRuntimeError0(
"JavaAdapter can not subclass methods with more then" + " 64 arguments.");
}
long convertionMask = 0;
for (int i = 0; i != parms.length; ++i) {
if (!parms[i].isPrimitive()) {
convertionMask |= (1 << i);
}
}
cfw.addPush(convertionMask);
// go through utility method, which creates a Context to run the
// method in.
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/JavaAdapter",
"callMethod",
"(Lorg/mozilla/javascript/ContextFactory;"
+ "Lorg/mozilla/javascript/Scriptable;"
+ "Lorg/mozilla/javascript/Function;"
+ "[Ljava/lang/Object;"
+ "J"
+ ")Ljava/lang/Object;");
generateReturnResult(cfw, returnType, convertResult);
cfw.stopMethod((short) paramsEnd);
}
/**
* Generates code to convert a wrapped value type to a primitive type. Handles unwrapping
* java.lang.Boolean, and java.lang.Number types. Generates the appropriate RETURN bytecode.
*/
static void generateReturnResult(
ClassFileWriter cfw, Class<?> retType, boolean callConvertResult) {
// wrap boolean values with java.lang.Boolean, convert all other
// primitive values to java.lang.Double.
if (retType == Void.TYPE) {
cfw.add(ByteCode.POP);
cfw.add(ByteCode.RETURN);
} else if (retType == Boolean.TYPE) {
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/Context",
"toBoolean",
"(Ljava/lang/Object;)Z");
cfw.add(ByteCode.IRETURN);
} else if (retType == Character.TYPE) {
// characters are represented as strings in JavaScript.
// return the first character.
// first convert the value to a string if possible.
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/Context",
"toString",
"(Ljava/lang/Object;)Ljava/lang/String;");
cfw.add(ByteCode.ICONST_0);
cfw.addInvoke(ByteCode.INVOKEVIRTUAL, "java/lang/String", "charAt", "(I)C");
cfw.add(ByteCode.IRETURN);
} else if (retType.isPrimitive()) {
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/Context",
"toNumber",
"(Ljava/lang/Object;)D");
String typeName = retType.getName();
switch (typeName.charAt(0)) {
case 'b':
case 's':
case 'i':
cfw.add(ByteCode.D2I);
cfw.add(ByteCode.IRETURN);
break;
case 'l':
cfw.add(ByteCode.D2L);
cfw.add(ByteCode.LRETURN);
break;
case 'f':
cfw.add(ByteCode.D2F);
cfw.add(ByteCode.FRETURN);
break;
case 'd':
cfw.add(ByteCode.DRETURN);
break;
default:
throw new RuntimeException("Unexpected return type " + retType.toString());
}
} else {
String retTypeStr = retType.getName();
if (callConvertResult) {
cfw.addLoadConstant(retTypeStr);
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"java/lang/Class",
"forName",
"(Ljava/lang/String;)Ljava/lang/Class;");
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/JavaAdapter",
"convertResult",
"(Ljava/lang/Object;" + "Ljava/lang/Class;" + ")Ljava/lang/Object;");
}
// Now cast to return type
cfw.add(ByteCode.CHECKCAST, retTypeStr);
cfw.add(ByteCode.ARETURN);
}
}
/**
* Generates code to wrap Java argument into Object. Non-primitive Java types are left unconverted
* pending conversion in the helper method. Leaves the wrapper object on the top of the stack.
*/
private static int generateWrapArg(ClassFileWriter cfw, int paramOffset, Class<?> argType) {
int size = 1;
if (!argType.isPrimitive()) {
cfw.add(ByteCode.ALOAD, paramOffset);
} else if (argType == Boolean.TYPE) {
// wrap boolean values with java.lang.Boolean.
cfw.add(ByteCode.NEW, "java/lang/Boolean");
cfw.add(ByteCode.DUP);
cfw.add(ByteCode.ILOAD, paramOffset);
cfw.addInvoke(ByteCode.INVOKESPECIAL, "java/lang/Boolean", "<init>", "(Z)V");
} else if (argType == Character.TYPE) {
// Create a string of length 1 using the character parameter.
cfw.add(ByteCode.ILOAD, paramOffset);
cfw.addInvoke(ByteCode.INVOKESTATIC, "java/lang/String", "valueOf", "(C)Ljava/lang/String;");
} else {
// convert all numeric values to java.lang.Double.
cfw.add(ByteCode.NEW, "java/lang/Double");
cfw.add(ByteCode.DUP);
String typeName = argType.getName();
switch (typeName.charAt(0)) {
case 'b':
case 's':
case 'i':
// load an int value, convert to double.
cfw.add(ByteCode.ILOAD, paramOffset);
cfw.add(ByteCode.I2D);
break;
case 'l':
// load a long, convert to double.
cfw.add(ByteCode.LLOAD, paramOffset);
cfw.add(ByteCode.L2D);
size = 2;
break;
case 'f':
// load a float, convert to double.
cfw.add(ByteCode.FLOAD, paramOffset);
cfw.add(ByteCode.F2D);
break;
case 'd':
cfw.add(ByteCode.DLOAD, paramOffset);
size = 2;
break;
}
cfw.addInvoke(ByteCode.INVOKESPECIAL, "java/lang/Double", "<init>", "(D)V");
}
return size;
}
private static void generateEmptyCtor(
ClassFileWriter cfw, String adapterName, String superName, String scriptClassName) {
cfw.startMethod("<init>", "()V", ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", "()V");
// Set factory to null to use current global when necessary
cfw.add(ByteCode.ALOAD_0);
cfw.add(ByteCode.ACONST_NULL);
cfw.add(ByteCode.PUTFIELD, adapterName, "factory", "Lorg/mozilla/javascript/ContextFactory;");
// Load script class
cfw.add(ByteCode.NEW, scriptClassName);
cfw.add(ByteCode.DUP);
cfw.addInvoke(ByteCode.INVOKESPECIAL, scriptClassName, "<init>", "()V");
// Run script and save resulting scope
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/JavaAdapter",
"runScript",
"(Lorg/mozilla/javascript/Script;" + ")Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.ASTORE_1);
// Save the Scriptable in instance variable "delegee"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_1); // the Scriptable
cfw.add(ByteCode.PUTFIELD, adapterName, "delegee", "Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.ALOAD_0); // this for the following PUTFIELD for self
// create a wrapper object to be used as "this" in method calls
cfw.add(ByteCode.ALOAD_1); // the Scriptable
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/JavaAdapter",
"createAdapterWrapper",
"(Lorg/mozilla/javascript/Scriptable;"
+ "Ljava/lang/Object;"
+ ")Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.PUTFIELD, adapterName, "self", "Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.RETURN);
cfw.stopMethod((short) 2); // this + delegee
}
private static void generateCtor(
ClassFileWriter cfw, String adapterName, String superName, Constructor<?> superCtor) {
short locals = 3; // this + factory + delegee
Class<?>[] parameters = superCtor.getParameterTypes();
// Note that we swapped arguments in app-facing constructors to avoid
// conflicting signatures with serial constructor defined below.
if (parameters.length == 0) {
cfw.startMethod(
"<init>",
"(Lorg/mozilla/javascript/Scriptable;" + "Lorg/mozilla/javascript/ContextFactory;)V",
ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", "()V");
} else {
StringBuilder sig =
new StringBuilder(
"(Lorg/mozilla/javascript/Scriptable;" + "Lorg/mozilla/javascript/ContextFactory;");
int marker = sig.length(); // lets us reuse buffer for super
// signature
for (Class<?> c : parameters) {
appendTypeString(sig, c);
}
sig.append(")V");
cfw.startMethod("<init>", sig.toString(), ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
short paramOffset = 3;
for (Class<?> parameter : parameters) {
paramOffset += generatePushParam(cfw, paramOffset, parameter);
}
locals = paramOffset;
sig.delete(1, marker);
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", sig.toString());
}
// Save parameter in instance variable "delegee"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_1); // first arg: Scriptable delegee
cfw.add(ByteCode.PUTFIELD, adapterName, "delegee", "Lorg/mozilla/javascript/Scriptable;");
// Save parameter in instance variable "factory"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_2); // second arg: ContextFactory instance
cfw.add(ByteCode.PUTFIELD, adapterName, "factory", "Lorg/mozilla/javascript/ContextFactory;");
cfw.add(ByteCode.ALOAD_0); // this for the following PUTFIELD for self
// create a wrapper object to be used as "this" in method calls
cfw.add(ByteCode.ALOAD_1); // the Scriptable delegee
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"org/mozilla/javascript/JavaAdapter",
"createAdapterWrapper",
"(Lorg/mozilla/javascript/Scriptable;"
+ "Ljava/lang/Object;"
+ ")Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.PUTFIELD, adapterName, "self", "Lorg/mozilla/javascript/Scriptable;");
cfw.add(ByteCode.RETURN);
cfw.stopMethod(locals);
}
