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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac.atree;
import java.util.List;
import java.util.ArrayList;
import scalac.Unit;
import scalac.ast.Tree;
import scalac.ast.Tree.Template;
import scalac.symtab.Definitions;
import scalac.symtab.Symbol;
import scalac.util.Debug;
/** This class translates syntax trees into attributed trees. */
public class ATreeFromSTree {
//########################################################################
// Private Fields
/** The global definitions */
private final Definitions definitions;
/** The attributed tree factory */
private final ATreeFactory make;
//########################################################################
// Public Constructors
/** Initializes this instance. */
public ATreeFromSTree(Definitions definitions) {
this.definitions = definitions;
this.make = new ATreeFactory();
}
//########################################################################
// Public Methods - Translating units
/** Translates the unit's body and stores the result in it. */
public void translate(Unit unit) {
template(unit.repository = new ARepository(), unit.body);
}
//########################################################################
// Private Methods - Translating templates
/** Translates the templates and adds them to the repository. */
private void template(ARepository repository, Tree[] trees) {
for (int i = 0; i < trees.length; i++) template(repository, trees[i]);
}
/** Translates the template and adds it to the repository. */
private void template(ARepository repository, Tree tree) {
switch (tree) {
case Empty:
return;
case ClassDef(_, _, _, _, _, Template(_, Tree[] body)):
AClass clasz = new AClass(tree.symbol());
repository.addClass(clasz);
member(clasz, body);
return;
case PackageDef(_, Template(_, Tree[] body)):
template(repository, body);
return;
case ValDef(_, _, _, Tree rhs):
// !!!
return;
default:
throw Debug.abort("illegal case", tree);
}
}
//########################################################################
// Private Methods - Translating members
/** Translates the members and adds them to the class. */
private void member(AClass clasz, Tree[] trees) {
for (int i = 0; i < trees.length; i++) member(clasz, trees[i]);
}
/** Translates the member and adds it to the class. */
private void member(AClass clasz, Tree tree) {
switch (tree) {
case Empty:
return;
case ClassDef(_, _, _, _, _, _):
template(clasz, tree);
return;
case ValDef(_, _, _, Tree rhs):
AField field = new AField(tree.symbol(), false);
clasz.addField(field);
return;
case DefDef(_, _, _, _, _, Tree rhs):
AMethod method = new AMethod(tree.symbol(), false);
clasz.addMethod(method);
if (!method.isAbstract()) method.setCode(expression(rhs));
return;
default:
throw Debug.abort("illegal case", tree);
}
}
//########################################################################
// Private Methods - Translating statements
/** Translates the statements. */
private ACode[] statement(List locals, Tree[] trees, int start, int count){
List codes = new ArrayList();
for (int i = start; i < count; i++) {
ACode code = statement(locals, trees[i]);
if (code != ACode.Void) codes.add(code);
}
return (ACode[])codes.toArray(new ACode[codes.size()]);
}
/** Translates the statement. */
private ACode statement(List locals, Tree tree) {
switch (tree) {
case Empty:
return make.Void;
case ValDef(_, _, _, Tree rhs):
Symbol symbol = tree.symbol();
locals.add(symbol);
ALocation location = ALocation.Local(symbol, false);
return make.Store(tree, location, expression(rhs));
default:
return ACode.Drop(expression(tree), tree.type());
}
}
//########################################################################
// Private Methods - Translating expressions
/** Translates the expressions. */
private ACode[] expression(Tree[] trees) {
ACode[] codes = new ACode[trees.length];
for (int i = 0; i < codes.length; i++) codes[i] = expression(trees[i]);
return codes;
}
/** Translates the expression. */
private ACode expression(Tree tree) {
return ACode.Void;
}
//########################################################################
// Private Methods - Translating locations
/** Translates the location. */
private ALocation location(Tree tree) {
switch (tree) {
case Select(Tree qualifier, _):
Symbol symbol = tree.symbol();
if (symbol.isModule())
return ALocation.Module(symbol); // !!! qualifier is ignored !
if (symbol.isJava() && symbol.owner().isModuleClass())
return ALocation.Field(make.Void, symbol, true); // !!! qualifier is ignored !
return ALocation.Field(expression(qualifier), symbol, false);
case Ident(_):
Symbol symbol = tree.symbol();
if (symbol.isModule()) return ALocation.Module(symbol);
return ALocation.Local(symbol, symbol.isParameter());
default:
throw Debug.abort("illegal case", tree);
}
}
//########################################################################
// Private Methods - Translating constants
/** Translates the constant. */
private AConstant constant(Object value) {
if (value instanceof Boolean ) return make.BOOLEAN((Boolean )value);
if (value instanceof Byte ) return make.BYTE (((Byte )value));
if (value instanceof Short ) return make.SHORT ((Short )value);
if (value instanceof Character) return make.CHAR ((Character)value);
if (value instanceof Integer ) return make.INT ((Integer )value);
if (value instanceof Long ) return make.LONG ((Long )value);
if (value instanceof Float ) return make.FLOAT ((Float )value);
if (value instanceof Double ) return make.DOUBLE ((Double )value);
if (value instanceof String ) return make.STRING ((String )value);
throw Debug.abort("illegal constant", value +" -- "+ value.getClass());
}
//########################################################################
}
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