/** * Registers an attribute and gives it a type so that it can be mapped to DOM attribute types at * run-time. */ public int registerAttribute(QName name) { Integer code = (Integer) _attributes.get(name.toString()); if (code == null) { code = new Integer(_nextGType++); _attributes.put(name.toString(), code); final String uri = name.getNamespace(); final String local = "@" + name.getLocalPart(); if ((uri != null) && (!uri.equals(""))) _namesIndex.addElement(uri + ":" + local); else _namesIndex.addElement(local); if (name.getLocalPart().equals("*")) { registerNamespace(name.getNamespace()); } } return code.intValue(); }
/** * Type check a call to a standard function. Insert CastExprs when needed. If as a result of the * insertion of a CastExpr a type check error is thrown, then catch it and re-throw it with a new * "this". */ public Type typeCheckStandard(SymbolTable stable) throws TypeCheckError { _fname.clearNamespace(); // HACK!!! final int n = _arguments.size(); final Vector argsType = typeCheckArgs(stable); final MethodType args = new MethodType(Type.Void, argsType); final MethodType ptype = lookupPrimop(stable, _fname.getLocalPart(), args); if (ptype != null) { for (int i = 0; i < n; i++) { final Type argType = (Type) ptype.argsType().elementAt(i); final Expression exp = (Expression) _arguments.elementAt(i); if (!argType.identicalTo(exp.getType())) { try { _arguments.setElementAt(new CastExpr(exp, argType), i); } catch (TypeCheckError e) { throw new TypeCheckError(this); // invalid conversion } } } _chosenMethodType = ptype; return _type = ptype.resultType(); } throw new TypeCheckError(this); }
/** * Registers an element and gives it a type so that it can be mapped to DOM element types at * run-time. */ public int registerElement(QName name) { // Register element (full QName) Integer code = (Integer) _elements.get(name.toString()); if (code == null) { _elements.put(name.toString(), code = new Integer(_nextGType++)); _namesIndex.addElement(name.toString()); } if (name.getLocalPart().equals("*")) { registerNamespace(name.getNamespace()); } return code.intValue(); }
/** Return the signature of the current method */ private String getMethodSignature(Vector argsType) { final StringBuffer buf = new StringBuffer(_className); buf.append('.').append(_fname.getLocalPart()).append('('); int nArgs = argsType.size(); for (int i = 0; i < nArgs; i++) { final Type intType = (Type) argsType.elementAt(i); buf.append(intType.toString()); if (i < nArgs - 1) buf.append(", "); } buf.append(')'); return buf.toString(); }
/** * Registers a namespace prefix and gives it a type so that it can be mapped to DOM namespace * types at run-time. */ public int registerNamespacePrefix(QName name) { Integer code = (Integer) _namespacePrefixes.get(name.toString()); if (code == null) { code = new Integer(_nextGType++); _namespacePrefixes.put(name.toString(), code); final String uri = name.getNamespace(); if ((uri != null) && (!uri.equals(""))) { // namespace::ext2:ped2 will be made empty in TypedNamespaceIterator _namesIndex.addElement("?"); } else { _namesIndex.addElement("?" + name.getLocalPart()); } } return code.intValue(); }
/** * Returns a vector with all methods named <code>_fname</code> after stripping its namespace or * <code>null</code> if no such methods exist. */ private Vector findMethods() { Vector result = null; final String namespace = _fname.getNamespace(); if (_className != null && _className.length() > 0) { final int nArgs = _arguments.size(); try { if (_clazz == null) { _clazz = ObjectFactory.findProviderClass(_className, ObjectFactory.findClassLoader(), true); if (_clazz == null) { final ErrorMsg msg = new ErrorMsg(ErrorMsg.CLASS_NOT_FOUND_ERR, _className); getParser().reportError(Constants.ERROR, msg); } } final String methodName = _fname.getLocalPart(); final Method[] methods = _clazz.getMethods(); for (int i = 0; i < methods.length; i++) { final int mods = methods[i].getModifiers(); // Is it public and same number of args ? if (Modifier.isPublic(mods) && methods[i].getName().equals(methodName) && methods[i].getParameterTypes().length == nArgs) { if (result == null) { result = new Vector(); } result.addElement(methods[i]); } } } catch (ClassNotFoundException e) { final ErrorMsg msg = new ErrorMsg(ErrorMsg.CLASS_NOT_FOUND_ERR, _className); getParser().reportError(Constants.ERROR, msg); } } return result; }
/** * Translate a function call. The compiled code will leave the function's return value on the * JVM's stack. */ public void translate(ClassGenerator classGen, MethodGenerator methodGen) { final int n = argumentCount(); final ConstantPoolGen cpg = classGen.getConstantPool(); final InstructionList il = methodGen.getInstructionList(); final boolean isSecureProcessing = classGen.getParser().getXSLTC().isSecureProcessing(); int index; // Translate calls to methods in the BasisLibrary if (isStandard() || isExtension()) { for (int i = 0; i < n; i++) { final Expression exp = argument(i); exp.translate(classGen, methodGen); exp.startIterator(classGen, methodGen); } // append "F" to the function's name final String name = _fname.toString().replace('-', '_') + "F"; String args = Constants.EMPTYSTRING; // Special precautions for some method calls if (name.equals("sumF")) { args = DOM_INTF_SIG; il.append(methodGen.loadDOM()); } else if (name.equals("normalize_spaceF")) { if (_chosenMethodType.toSignature(args).equals("()Ljava/lang/String;")) { args = "I" + DOM_INTF_SIG; il.append(methodGen.loadContextNode()); il.append(methodGen.loadDOM()); } } // Invoke the method in the basis library index = cpg.addMethodref(BASIS_LIBRARY_CLASS, name, _chosenMethodType.toSignature(args)); il.append(new INVOKESTATIC(index)); } // Add call to BasisLibrary.unresolved_externalF() to generate // run-time error message for unsupported external functions else if (unresolvedExternal) { index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "unresolved_externalF", "(Ljava/lang/String;)V"); il.append(new PUSH(cpg, _fname.toString())); il.append(new INVOKESTATIC(index)); } else if (_isExtConstructor) { if (isSecureProcessing) translateUnallowedExtension(cpg, il); final String clazz = _chosenConstructor.getDeclaringClass().getName(); Class[] paramTypes = _chosenConstructor.getParameterTypes(); LocalVariableGen[] paramTemp = new LocalVariableGen[n]; // Backwards branches are prohibited if an uninitialized object is // on the stack by section 4.9.4 of the JVM Specification, 2nd Ed. // We don't know whether this code might contain backwards branches // so we mustn't create the new object until after we've created // the suspect arguments to its constructor. Instead we calculate // the values of the arguments to the constructor first, store them // in temporary variables, create the object and reload the // arguments from the temporaries to avoid the problem. for (int i = 0; i < n; i++) { final Expression exp = argument(i); Type expType = exp.getType(); exp.translate(classGen, methodGen); // Convert the argument to its Java type exp.startIterator(classGen, methodGen); expType.translateTo(classGen, methodGen, paramTypes[i]); paramTemp[i] = methodGen.addLocalVariable( "function_call_tmp" + i, expType.toJCType(), il.getEnd(), null); il.append(expType.STORE(paramTemp[i].getIndex())); } il.append(new NEW(cpg.addClass(_className))); il.append(InstructionConstants.DUP); for (int i = 0; i < n; i++) { final Expression arg = argument(i); il.append(arg.getType().LOAD(paramTemp[i].getIndex())); } final StringBuffer buffer = new StringBuffer(); buffer.append('('); for (int i = 0; i < paramTypes.length; i++) { buffer.append(getSignature(paramTypes[i])); } buffer.append(')'); buffer.append("V"); index = cpg.addMethodref(clazz, "<init>", buffer.toString()); il.append(new INVOKESPECIAL(index)); // Convert the return type back to our internal type (Type.Object).translateFrom(classGen, methodGen, _chosenConstructor.getDeclaringClass()); } // Invoke function calls that are handled in separate classes else { if (isSecureProcessing) translateUnallowedExtension(cpg, il); final String clazz = _chosenMethod.getDeclaringClass().getName(); Class[] paramTypes = _chosenMethod.getParameterTypes(); // Push "this" if it is an instance method if (_thisArgument != null) { _thisArgument.translate(classGen, methodGen); } for (int i = 0; i < n; i++) { final Expression exp = argument(i); exp.translate(classGen, methodGen); // Convert the argument to its Java type exp.startIterator(classGen, methodGen); exp.getType().translateTo(classGen, methodGen, paramTypes[i]); } final StringBuffer buffer = new StringBuffer(); buffer.append('('); for (int i = 0; i < paramTypes.length; i++) { buffer.append(getSignature(paramTypes[i])); } buffer.append(')'); buffer.append(getSignature(_chosenMethod.getReturnType())); if (_thisArgument != null && _clazz.isInterface()) { index = cpg.addInterfaceMethodref(clazz, _fname.getLocalPart(), buffer.toString()); il.append(new INVOKEINTERFACE(index, n + 1)); } else { index = cpg.addMethodref(clazz, _fname.getLocalPart(), buffer.toString()); il.append( _thisArgument != null ? (InvokeInstruction) new INVOKEVIRTUAL(index) : (InvokeInstruction) new INVOKESTATIC(index)); } // Convert the return type back to our internal type _type.translateFrom(classGen, methodGen, _chosenMethod.getReturnType()); } }
/** * Type check a call to an external (Java) method. The method must be static an public, and a * legal type conversion must exist for all its arguments and its return type. Every method of * name <code>_fname</code> is inspected as a possible candidate. */ public Type typeCheckExternal(SymbolTable stable) throws TypeCheckError { int nArgs = _arguments.size(); final String name = _fname.getLocalPart(); // check if function is a contructor 'new' if (_fname.getLocalPart().equals("new")) { return typeCheckConstructor(stable); } // check if we are calling an instance method else { boolean hasThisArgument = false; if (nArgs == 0) _isStatic = true; if (!_isStatic) { if (_namespace_format == NAMESPACE_FORMAT_JAVA || _namespace_format == NAMESPACE_FORMAT_PACKAGE) hasThisArgument = true; Expression firstArg = (Expression) _arguments.elementAt(0); Type firstArgType = (Type) firstArg.typeCheck(stable); if (_namespace_format == NAMESPACE_FORMAT_CLASS && firstArgType instanceof ObjectType && _clazz != null && _clazz.isAssignableFrom(((ObjectType) firstArgType).getJavaClass())) hasThisArgument = true; if (hasThisArgument) { _thisArgument = (Expression) _arguments.elementAt(0); _arguments.remove(0); nArgs--; if (firstArgType instanceof ObjectType) { _className = ((ObjectType) firstArgType).getJavaClassName(); } else throw new TypeCheckError(ErrorMsg.NO_JAVA_FUNCT_THIS_REF, name); } } else if (_className.length() == 0) { /* * Warn user if external function could not be resolved. * Warning will _NOT_ be issued is the call is properly * wrapped in an <xsl:if> or <xsl:when> element. For details * see If.parserContents() and When.parserContents() */ final Parser parser = getParser(); if (parser != null) { reportWarning(this, parser, ErrorMsg.FUNCTION_RESOLVE_ERR, _fname.toString()); } unresolvedExternal = true; return _type = Type.Int; // use "Int" as "unknown" } } final Vector methods = findMethods(); if (methods == null) { // Method not found in this class throw new TypeCheckError(ErrorMsg.METHOD_NOT_FOUND_ERR, _className + "." + name); } Class extType = null; final int nMethods = methods.size(); final Vector argsType = typeCheckArgs(stable); // Try all methods to identify the best fit int bestMethodDistance = Integer.MAX_VALUE; _type = null; // reset internal type for (int j, i = 0; i < nMethods; i++) { // Check if all paramteters to this method can be converted final Method method = (Method) methods.elementAt(i); final Class[] paramTypes = method.getParameterTypes(); int currMethodDistance = 0; for (j = 0; j < nArgs; j++) { // Convert from internal (translet) type to external (Java) type extType = paramTypes[j]; final Type intType = (Type) argsType.elementAt(j); Object match = _internal2Java.maps(intType, extType); if (match != null) { currMethodDistance += ((JavaType) match).distance; } else { // no mapping available // // Allow a Reference type to match any external (Java) type at // the moment. The real type checking is performed at runtime. if (intType instanceof ReferenceType) { currMethodDistance += 1; } else if (intType instanceof ObjectType) { ObjectType object = (ObjectType) intType; if (extType.getName().equals(object.getJavaClassName())) currMethodDistance += 0; else if (extType.isAssignableFrom(object.getJavaClass())) currMethodDistance += 1; else { currMethodDistance = Integer.MAX_VALUE; break; } } else { currMethodDistance = Integer.MAX_VALUE; break; } } } if (j == nArgs) { // Check if the return type can be converted extType = method.getReturnType(); _type = (Type) _java2Internal.get(extType); if (_type == null) { _type = Type.newObjectType(extType); } // Use this method if all parameters & return type match if (_type != null && currMethodDistance < bestMethodDistance) { _chosenMethod = method; bestMethodDistance = currMethodDistance; } } } // It is an error if the chosen method is an instance menthod but we don't // have a this argument. if (_chosenMethod != null && _thisArgument == null && !Modifier.isStatic(_chosenMethod.getModifiers())) { throw new TypeCheckError(ErrorMsg.NO_JAVA_FUNCT_THIS_REF, getMethodSignature(argsType)); } if (_type != null) { if (_type == Type.NodeSet) { getXSLTC().setMultiDocument(true); } return _type; } throw new TypeCheckError(ErrorMsg.ARGUMENT_CONVERSION_ERR, getMethodSignature(argsType)); }
/** * Type check a function call. Since different type conversions apply, type checking is different * for standard and external (Java) functions. */ public Type typeCheck(SymbolTable stable) throws TypeCheckError { if (_type != null) return _type; final String namespace = _fname.getNamespace(); String local = _fname.getLocalPart(); if (isExtension()) { _fname = new QName(null, null, local); return typeCheckStandard(stable); } else if (isStandard()) { return typeCheckStandard(stable); } // Handle extension functions (they all have a namespace) else { try { _className = getClassNameFromUri(namespace); final int pos = local.lastIndexOf('.'); if (pos > 0) { _isStatic = true; if (_className != null && _className.length() > 0) { _namespace_format = NAMESPACE_FORMAT_PACKAGE; _className = _className + "." + local.substring(0, pos); } else { _namespace_format = NAMESPACE_FORMAT_JAVA; _className = local.substring(0, pos); } _fname = new QName(namespace, null, local.substring(pos + 1)); } else { if (_className != null && _className.length() > 0) { try { _clazz = ObjectFactory.findProviderClass( _className, ObjectFactory.findClassLoader(), true); _namespace_format = NAMESPACE_FORMAT_CLASS; } catch (ClassNotFoundException e) { _namespace_format = NAMESPACE_FORMAT_PACKAGE; } } else _namespace_format = NAMESPACE_FORMAT_JAVA; if (local.indexOf('-') > 0) { local = replaceDash(local); } String extFunction = (String) _extensionFunctionTable.get(namespace + ":" + local); if (extFunction != null) { _fname = new QName(null, null, extFunction); return typeCheckStandard(stable); } else _fname = new QName(namespace, null, local); } return typeCheckExternal(stable); } catch (TypeCheckError e) { ErrorMsg errorMsg = e.getErrorMsg(); if (errorMsg == null) { final String name = _fname.getLocalPart(); errorMsg = new ErrorMsg(ErrorMsg.METHOD_NOT_FOUND_ERR, name); } getParser().reportError(ERROR, errorMsg); return _type = Type.Void; } } }