| Methods Summary |
|---|
| public int | getIndex()
return (_local != null) ? _local.getIndex() : -1;
|
| public void | initialize(com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator classGen, com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator methodGen)This method is part of a little trick that is needed to use local
variables inside nested for-each loops. See the initializeVariables()
method in the ForEach class for an explanation
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// This is only done for local variables that are actually used
if (isLocal() && !_refs.isEmpty()) {
// Create a variable slot if none is allocated
if (_local == null) {
_local = methodGen.addLocalVariable2(getEscapedName(),
_type.toJCType(),
il.getEnd());
}
// Push the default value on the JVM's stack
if ((_type instanceof IntType) ||
(_type instanceof NodeType) ||
(_type instanceof BooleanType))
il.append(new ICONST(0)); // 0 for node-id, integer and boolean
else if (_type instanceof RealType)
il.append(new DCONST(0)); // 0.0 for floating point numbers
else
il.append(new ACONST_NULL()); // and 'null' for anything else
il.append(_type.STORE(_local.getIndex()));
}
|
| public void | parseContents(com.sun.org.apache.xalan.internal.xsltc.compiler.Parser parser)Parse the contents of the variable
// Parse 'name' and 'select' attributes plus parameter contents
super.parseContents(parser);
// Add a ref to this var to its enclosing construct
SyntaxTreeNode parent = getParent();
if (parent instanceof Stylesheet) {
// Mark this as a global variable
_isLocal = false;
// Check if a global variable with this name already exists...
Variable var = parser.getSymbolTable().lookupVariable(_name);
// ...and if it does we need to check import precedence
if (var != null) {
final int us = this.getImportPrecedence();
final int them = var.getImportPrecedence();
// It is an error if the two have the same import precedence
if (us == them) {
final String name = _name.toString();
reportError(this, parser, ErrorMsg.VARIABLE_REDEF_ERR,name);
}
// Ignore this if previous definition has higher precedence
else if (them > us) {
_ignore = true;
return;
}
else {
var.disable();
}
// Add this variable if we have higher precedence
}
((Stylesheet)parent).addVariable(this);
parser.getSymbolTable().addVariable(this);
}
else {
_isLocal = true;
}
|
| public void | translate(com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator classGen, com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator methodGen)
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final String name = getEscapedName();
// Make sure that a variable instance is only compiled once
if (_ignore) return;
_ignore = true;
if (isLocal()) {
// Compile variable value computation
translateValue(classGen, methodGen);
// Add a new local variable and store value
if (_refs.isEmpty()) { // Remove it if nobody uses the value
il.append(_type.POP());
_local = null;
}
else { // Store in local var slot if referenced
if (_local == null) mapRegister(methodGen);
il.append(_type.STORE(_local.getIndex()));
}
}
else {
String signature = _type.toSignature();
// Global variables are store in class fields
if (classGen.containsField(name) == null) {
classGen.addField(new Field(ACC_PUBLIC,
cpg.addUtf8(name),
cpg.addUtf8(signature),
null, cpg.getConstantPool()));
// Push a reference to "this" for putfield
il.append(classGen.loadTranslet());
// Compile variable value computation
translateValue(classGen, methodGen);
// Store the variable in the allocated field
il.append(new PUTFIELD(cpg.addFieldref(classGen.getClassName(),
name, signature)));
}
}
|
| public com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type | typeCheck(com.sun.org.apache.xalan.internal.xsltc.compiler.SymbolTable stable)Runs a type check on either the variable element body or the
expression in the 'select' attribute
// Type check the 'select' expression if present
if (_select != null) {
_type = _select.typeCheck(stable);
}
// Type check the element contents otherwise
else if (hasContents()) {
typeCheckContents(stable);
_type = Type.ResultTree;
}
else {
_type = Type.Reference;
}
// The return type is void as the variable element does not leave
// anything on the JVM's stack. The '_type' global will be returned
// by the references to this variable, and not by the variable itself.
return Type.Void;
|
