/*

  * 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/.

  */

 #ifndef _include_bytecode_compiler_h_

 #define _include_bytecode_compiler_h_

 #include "AST.h"

 #include "BytecodeEmitter.h"

 #include "Code.h"

 namespace jc {

 class Module;

 class BytecodeCompiler : public AstVisitor

 {

     ParseTree *tree_;

     BytecodeEmitter emitter_;

     Module *module_;

     FixedArray *locals_;

     Scope *scope_;

     class LoopScope

     {

         Scope *scope_;

         BytecodeEmitter::Label *bk_;

         BytecodeEmitter::Label *ct_;

         LoopScope **prevp_;

         LoopScope *prev_;

       public:

         LoopScope(Scope *scope, BytecodeEmitter::Label *bk, BytecodeEmitter::Label *ct,

                   LoopScope **prevp)

           : scope_(scope),

             bk_(bk),

             ct_(ct),

             prevp_(prevp),

             prev_(*prevp)

         {

             *prevp_ = this;

         }

         ~LoopScope()

         {

             *prevp_ = prev_;

         }

         BytecodeEmitter::Label *break_() {

             return bk_;

         }

         BytecodeEmitter::Label *continue_() {

             return ct_;

         }

         Scope *scope() {

             return scope_;

         }

     };

     LoopScope *loop_;

   public:

     class AutoEnterScope

     {

         BytecodeCompiler *bc_;

         Scope *saved_;

       public:

         AutoEnterScope(BytecodeCompiler *bc, Scope *scope)

           : bc_(bc),

             saved_(bc->scope_)

         {

             if (scope)

                 bc->scope_ = scope;

         }

         ~AutoEnterScope() {

             bc_->scope_ = saved_;

         }

     };

   private:

     void recordLifoSlot(Scope *scope);

     void unwindTo(Scope *scope);

     void visitForTest(Expression *expression, BytecodeEmitter::Label *label, bool onTrue);

     Code *compileFunction(Module *module, FunctionStatement *fun);

     void visitForALU(Type *needed, Expression *node);

   public:

     BytecodeCompiler(ParseTree *tree, Module *module);

     Module *compile();

   public:

     void visit(NameProxy *name);

     void visit(Assignment *node);

     void visit(BinaryExpression *node);

     void visit(ReturnStatement *node);

     void visit(ForStatement *node);

     void visit(BlockStatement *node);

     void visit(VariableDeclaration *node);

     void visit(IntegerLiteral *node);

     void visit(FloatLiteral *node);

     void visit(ExpressionStatement *node);

     void visit(FunctionStatement *node);

     void visit(CallExpression *node);

     void visit(IfStatement *node);

     void visit(IndexExpression *node);

     void visit(EnumStatement *node);

     void visit(WhileStatement *node);

     void visit(BreakStatement *node);

     void visit(ContinueStatement *node);

 };

 }

 #endif // _include_bytecode_generator_h_