/*

  * Copyright (C) 2012 David Anderson

  *

  * This file is part of JITCraft.

  *

  * JITCraft is free software: you can redistribute it and/or modify it under

  * the terms of the GNU General Public License as published by the Free

  * Software Foundation, either version 3 of the License, or (at your option)

  * any later version.

  * 

  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY

  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along with

  * JITCraft. If not, see http://www.gnu.org/licenses/.

  */

 #include <strings.h>

 #include "Types.h"

 #include "Zone.h"

 #include "Strings.h"

 #include "Heap-inl.h"

 using namespace ke;

 Type *

 Type::NewVoid(Zone *zone)

 {

     Local<Type> type(zone, Type::cast(zone->allocate(MapKind_Type, sizeof(Type), Heap::Tenure_Old)));

     if (!type)

         return NULL;

     type->kind_ = VOID;

     type->tag_ = NULL;

     type->contained_ = NULL;

     type->returnType_ = NULL;

     type->parameters_ = NULL;

     return type;

 }

 Type *

 Type::NewPrimitive(Zone *zone, Handle<String> tag)

 {

     Local<Type> type(zone, Type::cast(zone->allocate(MapKind_Type, sizeof(Type), Heap::Tenure_Old)));

     if (!type)

         return NULL;

     type->kind_ = PRIMITIVE;

     type->tag_ = tag;

     type->contained_ = NULL;

     type->returnType_ = NULL;

     type->parameters_ = NULL;

     if (tag && strcmp(tag->chars(), "Float") == 0)

         type->primitive_ = PrimitiveType_Float;

     else if (tag && strcmp(tag->chars(), "String") == 0)

         type->primitive_ = PrimitiveType_Char;

     else

         type->primitive_ = PrimitiveType_Int32;

     return type;

 }

 Type *

 Type::NewPrimitive(Zone *zone, PrimitiveType prim)

 {

     Local<Type> type(zone, Type::cast(zone->allocate(MapKind_Type, sizeof(Type), Heap::Tenure_Old)));

     if (!type)

         return NULL;

     type->kind_ = PRIMITIVE;

     type->tag_ = NULL;

     type->contained_ = NULL;

     type->returnType_ = NULL;

     type->parameters_ = NULL;

     type->primitive_ = prim;

     return type;

 }

 Type *

 Type::NewArray(Zone *zone, Handle<Type> contained, int elements, bool isConst)

 {

     Local<Type> type(zone, Type::cast(zone->allocate(MapKind_Type, sizeof(Type), Heap::Tenure_Old)));

     if (!type)

         return NULL;

     type->kind_ = ARRAY;

     type->tag_ = NULL;

     type->contained_ = contained;

     type->returnType_ = NULL;

     type->parameters_ = NULL;

     type->elements_ = elements;

     if (contained->isPrimitive())

         type->levels_ = 1;

     else

         type->levels_ = contained->levels() + 1;

     type->const_ = isConst;

     return type;

 }

 Type *

 Type::NewReference(Zone *zone, Handle<Type> contained, bool isConst)

 {

     Local<Type> type(zone, Type::cast(zone->allocate(MapKind_Type, sizeof(Type), Heap::Tenure_Old)));

     if (!type)

         return NULL;

     type->kind_ = REFERENCE;

     type->tag_ = NULL;

     type->contained_ = contained;

     type->returnType_ = NULL;

     type->parameters_ = NULL;

     type->const_ = isConst;

     return type;

 }

 Type *

 Type::NewFunction(Zone *zone, Handle<Type> returnType, Handle<FixedArray> parameters)

 {

     Local<Type> type(zone, Type::cast(zone->allocate(MapKind_Type, sizeof(Type), Heap::Tenure_Old)));

     if (!type)

         return NULL;

     type->kind_ = FUNCTION;

     type->contained_ = NULL;

     type->returnType_ = returnType;

     type->parameters_ = parameters;

     return type;

 }

 Type *

 Type::NewNative(Zone *zone, Handle<Type> returnType, Handle<FixedArray> parameters, bool variadic)

 {

     Local<Type> type(zone, Type::cast(zone->allocate(MapKind_Type, sizeof(Type), Heap::Tenure_Old)));

     if (!type)

         return NULL;

     type->kind_ = NATIVE;

     type->contained_ = NULL;

     type->returnType_ = returnType;

     type->parameters_ = parameters;

     type->variadicNative_ = variadic;

     return type;

 }

 bool

 Type::Compare(Type *left, Type *right)

 {

     if (left->kind() != right->kind())

         return false;

     switch (left->kind()) {

       case Type::PRIMITIVE:

         return (left->primitive() == right->primitive() &&

                 left->tag() == right->tag());

       case Type::ARRAY:

       {

         if (left->levels() != right->levels())

           return false;

         if (left->elements() != right->elements())

           return false;

         return Compare(left->contained(), right->contained());

       }

       case Type::FUNCTION:

       {

         if (!Compare(left->returnType(), right->returnType()))

             return false;

         if (left->parameters()->length() != right->parameters()->length())

             return false;

         if (left->isNative() != right->isNative())

             return false;

         if (left->isNative() && (left->isNativeVariadic() != right->isNativeVariadic()))

             return false;

         for (unsigned i = 0; i < left->parameters()->length(); i++) {

             Type *leftparam = left->parameterAt(i);

             Type *rightparam = right->parameterAt(i);

             if (!Compare(leftparam, rightparam))

                 return false;

         }

         return true;

       }

       default:

         assert(left->kind() == Type::REFERENCE);

         return Compare(left->contained(), right->contained());

     }

 }