From 57a845d6766e58396184af3897915db42dfb6f6f Mon Sep 17 00:00:00 2001
From: paltherr <paltherr@epfl.ch>
Date: Thu, 2 Oct 2003 11:03:51 +0000
Subject: - Added a constructor to AbsTypeSymbols

- Changed ExplicitOuter to replace all TypeRefs prefixes by
- localThisTypes. Adapted ExpandMixins and Type to the new TypeRefs
---
 sources/scalac/symtab/Symbol.java                  | 21 +++++++++------------
 sources/scalac/symtab/Type.java                    | 16 ++++++++++------
 sources/scalac/transformer/ExpandMixins.java       |  7 ++++---
 .../transformer/ExplicitOuterClassesPhase.java     | 22 ++++++++++++----------
 4 files changed, 35 insertions(+), 31 deletions(-)

(limited to 'sources')

diff --git a/sources/scalac/symtab/Symbol.java b/sources/scalac/symtab/Symbol.java
index cc070c24af..6fa6a0db04 100644
--- a/sources/scalac/symtab/Symbol.java
+++ b/sources/scalac/symtab/Symbol.java
@@ -1358,8 +1358,7 @@ public abstract class TypeSymbol extends Symbol {
     public TypeSymbol(int kind, int pos, Name name, Symbol owner, int flags) {
         super(kind, pos, name, owner, flags);
         assert name.isTypeName() : this;
-        if (kind != TYPE)
-            this.constructor = TermSymbol.newConstructor(this, flags & ~MODUL);
+        this.constructor = TermSymbol.newConstructor(this, flags & ~MODUL);
     }
 
     protected void update(int pos, int flags) {
@@ -1371,12 +1370,10 @@ public abstract class TypeSymbol extends Symbol {
      */
     public void copyTo(Symbol sym) {
         super.copyTo(sym);
-        if (kind != TYPE) {
-            Symbol symconstr = ((TypeSymbol) sym).constructor;
-            constructor.copyTo(symconstr);
-            if (constructor.isInitialized())
-                symconstr.setInfo(fixConstrType(symconstr.type(), sym));
-        }
+        Symbol symconstr = ((TypeSymbol) sym).constructor;
+        constructor.copyTo(symconstr);
+        if (constructor.isInitialized())
+            symconstr.setInfo(fixConstrType(symconstr.type(), sym));
     }
 
     protected void copyConstructorInfo(TypeSymbol other) {
@@ -1423,18 +1420,17 @@ public abstract class TypeSymbol extends Symbol {
 
     /** Get primary constructor */
     public Symbol primaryConstructor() {
-        return (kind == TYPE) ? Symbol.NONE : constructor.firstAlternative();
+        return constructor.firstAlternative();
     }
 
     /** Get all constructors */
     public Symbol allConstructors() {
-        return (kind == TYPE) ? Symbol.NONE : constructor;
+        return constructor;
     }
 
     /** Get type parameters */
     public Symbol[] typeParams() {
-        return (kind == TYPE) ? Symbol.EMPTY_ARRAY
-            : primaryConstructor().info().typeParams();
+        return primaryConstructor().info().typeParams();
     }
 
     /** Get value parameters */
@@ -1611,6 +1607,7 @@ public class AbsTypeSymbol extends TypeSymbol {
     /** Constructor */
     public AbsTypeSymbol(int pos, Name name, Symbol owner, int flags) {
         super(TYPE, pos, name, owner, flags);
+        allConstructors().setType(Type.MethodType(EMPTY_ARRAY, thisType()));
     }
 
     public static AbsTypeSymbol define(
diff --git a/sources/scalac/symtab/Type.java b/sources/scalac/symtab/Type.java
index bb4a63f7ce..8be3dcd00a 100644
--- a/sources/scalac/symtab/Type.java
+++ b/sources/scalac/symtab/Type.java
@@ -1011,11 +1011,14 @@ public class Type implements Modifiers, Kinds, TypeTags, EntryTags {
      */
     static class AsSeenFromMap extends Map {
 
-	private Type pre;
-	private Symbol clazz;
+	private final Type pre;
+	private final Symbol clazz;
+        private final boolean local;
 
 	AsSeenFromMap(Type pre, Symbol clazz) {
 	    this.pre = pre; this.clazz = clazz;
+            Global global = Global.instance;
+            this.local =global.PHASE.EXPLICITOUTER.id()<global.currentPhase.id;
 	}
 
 	public Type apply(Type t) {
@@ -1036,12 +1039,13 @@ public class Type implements Modifiers, Kinds, TypeTags, EntryTags {
 		    //System.out.println(t + ".toInstance(" + pre + "," + clazz + ") = " + t1);//DEBUG
 		    return t1;
 		} else {
+                    if (local) prefix = sym.owner().thisType();
 		    Type prefix1 = apply(prefix);
-		    Symbol sym1 = (prefix1 == prefix || (sym.flags & MODUL) != 0)
-			? sym : prefix1.rebind(sym);
 		    Type[] args1 = map(args);
 		    if (prefix1 == prefix && args1 == args) return t;
-		    else return typeRef(prefix1, sym1, args1);
+		    Symbol sym1 = (sym.flags & MODUL) == 0 ? prefix1.rebind(sym) : sym;
+                    if (local) prefix1 = localThisType;
+		    return typeRef(prefix1, sym1, args1);
 		}
 
 	    case SingleType(Type prefix, Symbol sym):
@@ -1086,7 +1090,7 @@ public class Type implements Modifiers, Kinds, TypeTags, EntryTags {
 	Type toPrefix(Symbol sym, Type pre, Symbol clazz) {
 	    if (pre == NoType || clazz.kind != CLASS)
 		return this;
-	    else if (sym.isSubClass(clazz) &&
+	    else if ((sym.isSubClass(clazz) || clazz.isSubClass(sym)) &&
 		     pre.widen().symbol().isSubClass(sym))
 		return pre;
 	    else
diff --git a/sources/scalac/transformer/ExpandMixins.java b/sources/scalac/transformer/ExpandMixins.java
index a907743ff2..fcd173c9eb 100644
--- a/sources/scalac/transformer/ExpandMixins.java
+++ b/sources/scalac/transformer/ExpandMixins.java
@@ -140,9 +140,6 @@ public class ClassExpander {
         switch (type) {
         case TypeRef(Type prefix, Symbol symbol, Type[] args):
             map.insertType(symbol.typeParams(), args);
-            // !!! symbols could be equal but args different? need to rebind ?
-            if (prefix.symbol() != symbol.owner())
-                inlineMixinTParams(prefix.baseType(symbol.owner()));
             return;
         default:
             throw Debug.abort("illegal case", type);
@@ -183,6 +180,10 @@ public class ClassExpander {
         for (SymbolIterator i = symbols.iterator(true); i.hasNext();) {
             Symbol member = i.next();
             if (member.kind != scalac.symtab.Kinds.TYPE) continue;
+            // !!! use same trick as in erasure?
+            //Symbol clone = member.cloneSymbol(clasz);
+            //clone.setInfo(clasz.thisType().memberInfo(member));
+            //Symbol subst = clasz.thisType().memberType(clone).symbol();
             Symbol subst = clasz.thisType().memberType(member).symbol();
             if (subst == member) continue;
             Symbol subst1 = map.lookupSymbol(member);
diff --git a/sources/scalac/transformer/ExplicitOuterClassesPhase.java b/sources/scalac/transformer/ExplicitOuterClassesPhase.java
index 011904cf77..4efb1dced7 100644
--- a/sources/scalac/transformer/ExplicitOuterClassesPhase.java
+++ b/sources/scalac/transformer/ExplicitOuterClassesPhase.java
@@ -33,12 +33,14 @@ import scalac.util.Names;
  * - In every nested class, adds to each of its constructor a new
  *   value parameter that contains a link to the outer class.
  *
- * - In every nested class, adds to each of its constructor a new type
- *   parameter for every type parameter appearing in outer classes.
+ * - In every nested type, adds to each of its constructor a new type
+ *   parameter for every type parameter appearing in outer types.
  *
  * - In every class, adds a forwarding "super" method for every method
  *   that is accessed via "super" in a nested class.
  *
+ * - Replaces all prefixes of TypeRefs by localThisTypes.
+ *
  * - Adds all missing qualifiers.
  */
 public class ExplicitOuterClassesPhase extends Phase {
@@ -91,7 +93,7 @@ public class ExplicitOuterClassesPhase extends Phase {
                 : symbol.enclClass();
             //System.out.println("!!! debug2 = " + Debug.show(symbol) + " - " + Debug.show(owner) + " --- " + (owner == Symbol.NONE) + " -- #" + owner.name + "#");
             //if (onwer.isJava() && owner != Symbol.NONE && owner.name.length() > 0) // !!!
-            if (owner.isClass() || owner.isConstructor())
+            if (owner.isType() || owner.isConstructor())
             type = getOuterTypeSubst(owner, true).apply(type);
         }
 
@@ -121,9 +123,9 @@ public class ExplicitOuterClassesPhase extends Phase {
     //########################################################################
     // Private Methods - Outer class
 
-    /** Returns the outer class of the given class or constructor. */
+    /** Returns the outer class of the given type or constructor. */
     private Symbol getOuterClass(Symbol symbol) {
-        assert symbol.isClass() || symbol.isConstructor(): Debug.show(symbol);
+        assert symbol.isType() || symbol.isConstructor(): Debug.show(symbol);
         return symbol.owner();
     }
 
@@ -140,12 +142,12 @@ public class ExplicitOuterClassesPhase extends Phase {
         return nextValueParams(symbol)[0];
     }
 
-    /** Has the given class or constructor outer type links? */
+    /** Has the given type or constructor outer type links? */
     private boolean hasOuterTypeLinks(Symbol symbol) {
-        assert symbol.isClass() || symbol.isConstructor(): Debug.show(symbol);
+        assert symbol.isType() || symbol.isConstructor(): Debug.show(symbol);
         if (symbol.isJava()) return false;
         Symbol outer = getOuterClass(symbol);
-        return outer.isClass() && nextTypeParams(outer).length != 0;
+        return outer.isType() && nextTypeParams(outer).length != 0;
     }
 
     /** Returns the type substitution for the given class or constructor. */
@@ -212,11 +214,11 @@ public class ExplicitOuterClassesPhase extends Phase {
         public Type apply(Type type) {
             switch (type) {
             case TypeRef(Type prefix, Symbol symbol, Type[] targs):
-                if (!symbol.isClass()) break;
+                if (!symbol.owner().isType()) break;
                 prefix = apply(prefix);
                 targs = map(targs);
                 targs = Type.concat(getOuterTypeArgs(prefix, symbol), targs);
-                return Type.TypeRef(prefix, symbol, targs);
+                return Type.TypeRef(Type.localThisType, symbol, targs);
             }
             return map(type);
         }
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