SymbolTable to separate library, Class/Method Instances

1 files changed, 99 insertions, 95 deletions

diff --git a/typecheck/library/TypeCheckSimp.java b/typecheck/library/TypeCheckSimp.java
index b4844a1..3d262fd 100644
--- a/typecheck/library/TypeCheckSimp.java
+++ b/typecheck/library/TypeCheckSimp.java
@@ -2,34 +2,36 @@ package typecheck.library;
 
 import syntaxtree.*;
 import visitor.*;
+import st.*;
+import misc.*;
 import java.util.*;
 
 /**
  * Provides default methods which visit each node in the tree in depth-first
  * order.  Your visitors may extend this class.
  */
-public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,TypeInstance>> {
+public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,AbstractInstance>> {
 
     private int offset;
 
-    private void printNode(Node n, HashMap<String,TypeInstance> argu, boolean enter, TypeEnum consensus) {
+    private void printNode(Node n, HashMap<String,AbstractInstance> argu, boolean enter, TypeEnum consensus) {
         for (int i=0; i < this.offset; ++i)
-            Utilities.print_filter(".", false);
+            PrintFilter.print(".", false);
         if (enter)
-            Utilities.print_filter("Visiting ", false);
+            PrintFilter.print("Visiting ", false);
         else
-            Utilities.print_filter("Leaving ", false);
-        Utilities.print_filter(n.getClass().getSimpleName(), false);
+            PrintFilter.print("Leaving ", false);
+        PrintFilter.print(n.getClass().getSimpleName(), false);
         if (!enter) {
             if (consensus == TypeEnum.ERROR)
-                Utilities.print_filter(" did not type check.", false);
+                PrintFilter.print(" did not type check.", false);
             else
-                Utilities.print_filter(" found type " + consensus, false);
+                PrintFilter.print(" found type " + consensus, false);
         }
-        Utilities.print_filter("", true);
+        PrintFilter.print("", true);
     }
 
-    public TypeInstance visit(NodeList n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(NodeList n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -48,7 +50,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         return ret;
     }
 
-    public TypeInstance visit(NodeListOptional n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(NodeListOptional n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -72,7 +74,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
     }
 
     // FIXME
-    public TypeInstance visit(NodeOptional n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(NodeOptional n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -88,7 +90,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         return ret;
     }
 
-    public TypeInstance visit(NodeSequence n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(NodeSequence n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -106,13 +108,13 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         return ret;
     }
 
-    public TypeInstance visit(NodeToken n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(NodeToken n, HashMap<String,AbstractInstance> argu) {
         // A fixed string token. '⌣'
         for (int i=0; i < this.offset; ++i)
-            Utilities.print_filter(".", false);
-        Utilities.print_filter("Leaving " + n.getClass().getSimpleName() +
-                               " => " +
-                               n.toString(), true);
+            PrintFilter.print(".", false);
+        PrintFilter.print("Leaving " + n.getClass().getSimpleName() +
+                          " => " +
+                          n.toString(), true);
         return null;
     }
 
@@ -125,7 +127,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> ( TypeDeclaration() )*
      * f2 -> <EOF>
      */
-    public TypeInstance visit(Goal n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(Goal n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -158,7 +160,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f16 -> "}"
      * f17 -> "}"
      */
-    public TypeInstance visit(MainClass n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(MainClass n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -188,9 +190,9 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
 
     /**
      * f0 -> ClassDeclaration()
-     *                               | ClassExtendsDeclaration()
+     *     | ClassExtendsDeclaration()
      */
-    public TypeInstance visit(TypeDeclaration n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(TypeDeclaration n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -209,7 +211,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f4 -> ( MethodDeclaration() )*
      * f5 -> "}"
      */
-    public TypeInstance visit(ClassDeclaration n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ClassDeclaration n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -240,7 +242,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f6 -> ( MethodDeclaration() )*
      * f7 -> "}"
      */
-    public TypeInstance visit(ClassExtendsDeclaration n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ClassExtendsDeclaration n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -269,7 +271,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> Identifier()
      * f2 -> ";"
      */
-    public TypeInstance visit(VarDeclaration n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(VarDeclaration n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -298,7 +300,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f11 -> ";"
      * f12 -> "}"
      */
-    public TypeInstance visit(MethodDeclaration n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(MethodDeclaration n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -315,7 +317,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         TypeInstance retur = n.f10.accept(this, argu);
         n.f11.accept(this, argu);
         n.f12.accept(this, argu);
-        TypeInstance ret = (stmt.equal_type(ret_type) &&
+        TypeInstance ret = (stmt.same_type(ret_type) &&
                             stmt.has_checked()) ?
             new TypeInstance(null, TypeEnum.CHECK) :
             new TypeInstance(null, TypeEnum.ERROR);
@@ -329,7 +331,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f0 -> FormalParameter()
      * f1 -> ( FormalParameterRest() )*
      */
-    public TypeInstance visit(FormalParameterList n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(FormalParameterList n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -350,7 +352,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f0 -> Type()
      * f1 -> Identifier()
      */
-    public TypeInstance visit(FormalParameter n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(FormalParameter n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -366,7 +368,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f0 -> ","
      * f1 -> FormalParameter()
      */
-    public TypeInstance visit(FormalParameterRest n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(FormalParameterRest n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -380,15 +382,15 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
 
     /**
      * f0 -> ArrayType()
-     *                               | BooleanType()
-     *                               | IntegerType()
-     *                               | Identifier()
+     *     | BooleanType()
+     *     | IntegerType()
+     *     | Identifier()
      */
-    public TypeInstance visit(Type n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(Type n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
-        TypeInstance ret =      n.f0.accept(this, argu);
+        TypeInstance ret = n.f0.accept(this, argu);
 
         this.printNode(n, argu, false, ret.get_type());
         --this.offset;
@@ -400,11 +402,11 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> "["
      * f2 -> "]"
      */
-    public TypeInstance visit(ArrayType n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ArrayType n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
-        TypeInstance ret = new TypeInstance(null, TypeEnum.int_array);
+        TypeInstance ret = new TypeInstance(null, TypeEnum.intarray);
 
         this.printNode(n, argu, false, ret.get_type());
         --this.offset;
@@ -414,11 +416,11 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
     /**
      * f0 -> "boolean"
      */
-    public TypeInstance visit(BooleanType n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(BooleanType n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
-        TypeInstance ret =      new TypeInstance(null, TypeEnum.bool);
+        TypeInstance ret = new TypeInstance(null, TypeEnum.bool);
 
         this.printNode(n, argu, false, ret.get_type());
         --this.offset;
@@ -428,7 +430,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
     /**
      * f0 -> "int"
      */
-    public TypeInstance visit(IntegerType n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(IntegerType n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -441,13 +443,13 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
 
     /**
      * f0 -> Block()
-     *                               | AssignmentStatement()
-     *                               | ArrayAssignmentStatement()
-     *                               | IfStatement()
-     *                               | WhileStatement()
-     *                               | PrintStatement()
+     *     | AssignmentStatement()
+     *     | ArrayAssignmentStatement()
+     *     | IfStatement()
+     *     | WhileStatement()
+     *     | PrintStatement()
      */
-    public TypeInstance visit(Statement n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(Statement n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -463,7 +465,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> ( Statement() )*
      * f2 -> "}"
      */
-    public TypeInstance visit(Block n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(Block n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -486,7 +488,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f2 -> Expression()
      * f3 -> ";"
      */
-    public TypeInstance visit(AssignmentStatement n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(AssignmentStatement n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -494,7 +496,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         n.f1.accept(this, argu);
         TypeInstance rhs = n.f2.accept(this, argu);
         n.f3.accept(this, argu);
-        TypeInstance ret = (lhs.equal_type(rhs)) ?
+        TypeInstance ret = (lhs.same_type(rhs)) ?
             new TypeInstance(null, TypeEnum.CHECK) :
             new TypeInstance(null, TypeEnum.ERROR);
 
@@ -515,7 +517,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f5 -> Expression()
      * f6 -> ";"
      */
-    public TypeInstance visit(ArrayAssignmentStatement n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ArrayAssignmentStatement n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -526,7 +528,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         n.f4.accept(this, argu);
         TypeInstance value = n.f5.accept(this, argu);
         n.f6.accept(this, argu);
-        TypeInstance ret =      (id.get_type() == TypeEnum.int_array &&
+        TypeInstance ret =      (id.get_type() == TypeEnum.intarray &&
                                  index.get_type() == TypeEnum.integer &&
                                  value.get_type() == TypeEnum.integer) ?
             new TypeInstance(null, TypeEnum.CHECK) :
@@ -548,7 +550,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f5 -> "else"
      * f6 -> Statement()
      */
-    public TypeInstance visit(IfStatement n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(IfStatement n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -580,7 +582,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f3 -> ")"
      * f4 -> Statement()
      */
-    public TypeInstance visit(WhileStatement n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(WhileStatement n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -608,7 +610,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f3 -> ")"
      * f4 -> ";"
      */
-    public TypeInstance visit(PrintStatement n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(PrintStatement n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -628,16 +630,16 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
 
     /**
      * f0 -> AndExpression()
-     *                               | CompareExpression()
-     *                               | PlusExpression()
-     *                               | MinusExpression()
-     *                               | TimesExpression()
-     *                               | ArrayLookup()
-     *                               | ArrayLength()
-     *                               | MessageSend()
-     *                               | PrimaryExpression()
+     *     | CompareExpression()
+     *     | PlusExpression()
+     *     | MinusExpression()
+     *     | TimesExpression()
+     *     | ArrayLookup()
+     *     | ArrayLength()
+     *     | MessageSend()
+     *     | PrimaryExpression()
      */
-    public TypeInstance visit(Expression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(Expression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -655,7 +657,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> "&&"
      * f2 -> PrimaryExpression()
      */
-    public TypeInstance visit(AndExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(AndExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -679,7 +681,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> "<"
      * f2 -> PrimaryExpression()
      */
-    public TypeInstance visit(CompareExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(CompareExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -703,7 +705,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> "+"
      * f2 -> PrimaryExpression()
      */
-    public TypeInstance visit(PlusExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(PlusExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -727,7 +729,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> "-"
      * f2 -> PrimaryExpression()
      */
-    public TypeInstance visit(MinusExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(MinusExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -751,7 +753,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> "*"
      * f2 -> PrimaryExpression()
      */
-    public TypeInstance visit(TimesExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(TimesExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -777,7 +779,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f2 -> PrimaryExpression()
      * f3 -> "]"
      */
-    public TypeInstance visit(ArrayLookup n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ArrayLookup n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -785,7 +787,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         n.f1.accept(this, argu);
         TypeInstance index = n.f2.accept(this, argu);
         n.f3.accept(this, argu);
-        TypeInstance ret = (array.get_type() == TypeEnum.int_array &&
+        TypeInstance ret = (array.get_type() == TypeEnum.intarray &&
                             index.get_type() == TypeEnum.integer) ?
             new TypeInstance(null, TypeEnum.integer) :
             new TypeInstance(null, TypeEnum.ERROR);
@@ -802,14 +804,14 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> "."
      * f2 -> "length"
      */
-    public TypeInstance visit(ArrayLength n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ArrayLength n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
         TypeInstance ret = n.f0.accept(this, argu);
         n.f1.accept(this, argu);
         n.f2.accept(this, argu);
-        ret = (ret.get_type() == TypeEnum.int_array) ? new TypeInstance(null, TypeEnum.integer) :
+        ret = (ret.get_type() == TypeEnum.intarray) ? new TypeInstance(null, TypeEnum.integer) :
             new TypeInstance(null, TypeEnum.ERROR);
 
         this.printNode(n, argu, false, ret.get_type());
@@ -828,7 +830,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f4 -> ( ExpressionList() )?
      * f5 -> ")"
      */
-    public TypeInstance visit(MessageSend n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(MessageSend n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -847,7 +849,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f0 -> Expression()
      * f1 -> ( ExpressionRest() )*
      */
-    public TypeInstance visit(ExpressionList n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ExpressionList n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -867,7 +869,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f0 -> ","
      * f1 -> Expression()
      */
-    public TypeInstance visit(ExpressionRest n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ExpressionRest n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -881,16 +883,16 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
 
     /**
      * f0 -> IntegerLiteral()
-     *                               | TrueLiteral()
-     *                               | FalseLiteral()
-     *                               | Identifier()
-     *                               | ThisExpression()
-     *                               | ArrayAllocationExpression()
-     *                               | AllocationExpression()
-     *                               | NotExpression()
-     *                               | BracketExpression()
+     *     | TrueLiteral()
+     *     | FalseLiteral()
+     *     | Identifier()
+     *     | ThisExpression()
+     *     | ArrayAllocationExpression()
+     *     | AllocationExpression()
+     *     | NotExpression()
+     *     | BracketExpression()
      */
-    public TypeInstance visit(PrimaryExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(PrimaryExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -907,7 +909,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      *
      * f0 -> <INTEGER_LITERAL>
      */
-    public TypeInstance visit(IntegerLiteral n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(IntegerLiteral n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -921,7 +923,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      *
      * f0 -> "true"
      */
-    public TypeInstance visit(TrueLiteral n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(TrueLiteral n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -935,7 +937,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      *
      * f0 -> "false"
      */
-    public TypeInstance visit(FalseLiteral n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(FalseLiteral n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -950,12 +952,14 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      *
      * f0 -> <IDENTIFIER>
      */
-    public TypeInstance visit(Identifier n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(Identifier n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
         TypeInstance ret = (argu.get(n.f0.tokenImage) != null) ?
-            argu.get(n.f0.tokenImage) : new TypeInstance(null, TypeEnum.ERROR);
+            new TypeInstance(argu.get(n.f0.tokenImage).get_name(),
+                             argu.get(n.f0.tokenImage).get_type()) :
+            new TypeInstance(null, TypeEnum.ERROR);
 
         this.printNode(n, argu, false, ret.get_type());
         --this.offset;
@@ -968,7 +972,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      *
      * f0 -> "this"
      */
-    public TypeInstance visit(ThisExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ThisExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -989,7 +993,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f3 -> Expression()
      * f4 -> "]"
      */
-    public TypeInstance visit(ArrayAllocationExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(ArrayAllocationExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -998,7 +1002,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
         n.f2.accept(this, argu);
         TypeInstance ret = n.f3.accept(this, argu);
         n.f4.accept(this, argu);
-        ret = (ret.get_type() == TypeEnum.integer) ? new TypeInstance(null, TypeEnum.int_array) :
+        ret = (ret.get_type() == TypeEnum.integer) ? new TypeInstance(null, TypeEnum.intarray) :
             new TypeInstance(null, TypeEnum.ERROR);
 
         this.printNode(n, argu, false, ret.get_type());
@@ -1015,7 +1019,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f2 -> "("
      * f3 -> ")"
      */
-    public TypeInstance visit(AllocationExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(AllocationExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -1035,7 +1039,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f0 -> "!"
      * f1 -> Expression()
      */
-    public TypeInstance visit(NotExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(NotExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);
 
@@ -1054,7 +1058,7 @@ public class TypeCheckSimp implements GJVisitor<TypeInstance,HashMap<String,Type
      * f1 -> Expression()
      * f2 -> ")"
      */
-    public TypeInstance visit(BracketExpression n, HashMap<String,TypeInstance> argu) {
+    public TypeInstance visit(BracketExpression n, HashMap<String,AbstractInstance> argu) {
         ++this.offset;
         this.printNode(n, argu, true, null);