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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $OldId: Environment.java,v 1.13 2002/10/01 16:14:07 paltherr Exp $
// $Id$
package scalai;
import java.util.Map;
import java.util.HashMap;
import scalac.ast.Tree.ClassDef;
import scalac.symtab.Symbol;
import scalac.symtab.Type;
import scalac.symtab.Scope;
import scalac.symtab.Scope.SymbolIterator;
import scalac.util.Names;
import scalac.util.Debug;
public class Environment {
//########################################################################
// Private Fields
private final Compiler compiler;
private final JavaMirror mirror;
private final Map/*<Symbol,ClassDef>*/ classdefs;
private final Map/*<Symbol,Template>*/ templates;
private final Map/*<Symbol,Function>*/ functions;
private final Map/*<Symbol,Variable>*/ variables;
private final Map/*<Symbol,Override>*/ overrides;
//########################################################################
// Public Constructors
public Environment(Compiler compiler, JavaMirror mirror) {
this.compiler = compiler;
this.mirror = mirror;
this.classdefs = new HashMap();
this.templates = new HashMap();
this.functions = new HashMap();
this.variables = new HashMap();
this.overrides = new HashMap();
}
//########################################################################
// Public Methods - insert
public ClassDef insertClassDef(Symbol symbol, ClassDef classdef) {
assert symbol.isType() : Debug.show(symbol);
assert Debug.log("insert classdef: ", symbol);
Object value = classdefs.put(symbol, classdef);
assert value == null : Debug.show(symbol) + " -> " + value;
assert !templates.containsKey(symbol) : Debug.show(symbol);
return classdef;
}
private Template insertTemplate(Symbol symbol, Template template) {
assert symbol.isType() : Debug.show(symbol);
assert Debug.log("insert template: ", symbol);
Object value = templates.put(symbol, template);
assert !classdefs.containsKey(symbol) : Debug.show(symbol);
assert value == null : Debug.show(symbol) + " -> " + value;
return template;
}
public Function insertFunction(Symbol symbol, Function function) {
assert symbol.isTerm() : Debug.show(symbol);
assert Debug.log("insert function: ", symbol);
Object value = functions.put(symbol, function);
assert value == null : Debug.show(symbol) + " -> " + value;
return function;
}
public Variable insertVariable(Symbol symbol, Variable variable) {
assert symbol.isTerm() : Debug.show(symbol);
assert Debug.log("insert variable: ", symbol);
Object value = variables.put(symbol, variable);
assert value == null : Debug.show(symbol) + " -> " + value;
return variable;
}
public Override insertOverride(Symbol symbol, Override override) {
assert symbol.isTerm() : Debug.show(symbol);
assert Debug.log("insert override: ", symbol);
Object value = overrides.put(symbol, override);
assert value == null : Debug.show(symbol) + " -> " + value;
return override;
}
//########################################################################
// Public Methods - lookup
public Template lookupTemplate(Symbol symbol) {
assert symbol.isType() : Debug.show(symbol);
Object value = templates.get(symbol);
if (value != null) return (Template)value;
if (symbol.isExternal()) {
Template template = Template.JavaClass(mirror.getClass(symbol));
return insertTemplate(symbol, template);
} else {
return loadTemplate(symbol);
}
}
public Function lookupFunction(Symbol symbol) {
assert symbol.isTerm() : Debug.show(symbol);
Object value = functions.get(symbol);
if (value != null) return (Function)value;
if (symbol.isExternal()) {
Function function = (symbol.name == Names.CONSTRUCTOR) ?
Function.JavaConstructor(mirror.getConstructor(symbol)) :
Function.JavaMethod(mirror.getMethod(symbol));
return insertFunction(symbol, function);
} else {
return (Function)loadOwnerThenGet("function", symbol, functions);
}
}
public Variable lookupVariable(Symbol symbol) {
assert symbol.isTerm() : Debug.show(symbol);
Object value = variables.get(symbol);
if (value != null) return (Variable)value;
if (symbol.isJava() && symbol.isModule()) {
// !!! This should never happen. This value will never be used.
Class clasz = mirror.getClass(symbol.moduleClass());
Variable variable = Variable.Global(clasz);
return insertVariable(symbol, variable);
} else if (symbol.isExternal()) {
Variable variable = Variable.JavaField(mirror.getField(symbol));
return insertVariable(symbol, variable);
} else {
return (Variable)loadOwnerThenGet("variable", symbol, variables);
}
}
public Override lookupOverride(Symbol symbol) {
assert symbol.isTerm() : Debug.show(symbol);
Object value = overrides.get(symbol);
if (value != null) return (Override)value;
return loadOwnerOverridesThenGet(symbol);
}
//########################################################################
// Private Methods - template loading
private Object loadOwnerThenGet(String what, Symbol symbol, Map table) {
loadOwner(what, symbol);
Object value = table.get(symbol);
assert value != null : Debug.show(symbol) + " -> " + value;
return value;
}
private void loadOwner(String what, Symbol symbol) {
assert Debug.log("search ", what, ": ", symbol);
assert symbol.owner().isType() : Debug.show(symbol);
assert!symbol.owner().isExternal() : Debug.show(symbol);
loadTemplate(symbol.owner());
}
private Template loadTemplate(Symbol symbol) {
Object test1 = classdefs.remove(symbol);
if (test1 != null) return loadTemplate(symbol, (ClassDef)test1);
loadOwner("template", symbol);
Object test2 = classdefs.remove(symbol);
if (test2 != null) return loadTemplate(symbol, (ClassDef)test2);
Object value = templates.get(symbol);
assert value != null : Debug.show(symbol) + " -> " + value;
return (Template)value;
}
private Template loadTemplate(Symbol symbol, ClassDef classdef) {
Template template = Template.Global(compiler.load(symbol, classdef));
return insertTemplate(symbol, template);
}
//########################################################################
// Private Methods - override loading
private Override loadOwnerOverridesThenGet(Symbol symbol) {
assert Debug.log("search override: ", symbol);
assert symbol.owner().isType() : Debug.show(symbol);
loadTemplateOverrides(symbol.owner());
Object value = overrides.get(symbol);
assert value != null : Debug.show(symbol) + " -> " + value;
return (Override)value;
}
private void loadTemplateOverrides(Symbol symbol) {
Type[] bases = symbol.parents();
SymbolIterator i = symbol.members().iterator(true);
while (i.hasNext()) loadMethodOverride(bases, i.next());
}
private void loadMethodOverride(Type[] bases, Symbol symbol) {
if (!symbol.isMethod()) return;
Override override = Override.empty().insert(symbol);
if (!symbol.isInitializer()) {
if (symbol.isExternal()) override.insert(mirror.getMethod(symbol));
for (int i = 0; i < bases.length; i++) {
Symbol overridden = symbol.overriddenSymbol(bases[i], true);
if (overridden == Symbol.NONE) continue;
assert Debug.log("update override: ",symbol," <- ",overridden);
override.insert(lookupOverride(overridden));
}
}
insertOverride(symbol, override);
}
//########################################################################
}
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