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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    asmdata.h

//

// Project:     Zip CPU -- a small, lightweight, RISC CPU core

//

// Purpose:     Data structures for the assembler.  In particular, this file

//              declares: Abstract Syntax Trees (ASTs) to store operations for

//              later calculation, ASMLINEs or assembled lines (which may or

//              may not be defined, depending upon symbol table status),

//              symbol table access and the final output object file together

//              with its necessary relocations.  Yes, linking is done, but as

//              part of the assembler and not part of a separate linker.

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Tecnology, LLC

//

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2015, Gisselquist Technology, LLC

//

// This program is free software (firmware): 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.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY 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 this program.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

////////////////////////////////////////////////////////////////////////////////

#ifndef ASMDATA_H

#define ASMDATA_H

#include <stdio.h>

#include <string>

#include <list>

#include "zopcodes.h"

#include "zparser.h"

extern  "C" char        *linecp;

extern  int     yylineno;

typedef enum {

//      TST     OPCND

        // Dual operand instructions that take conditions

        OP_CMP, OP_TST, OP_MOV, OP_LDIHI, OP_LDILO, OP_MPYU, OP_MPYS, OP_ROL,

                OP_SUB, OP_AND, OP_ADD, OP_OR, OP_XOR,

                OP_LSL, OP_ASR, OP_LSR,

        // Memory operands/operators

        OP_LOD, OP_STO,

        // Dual operand instructions that do not take conditions

        OP_LDI,

        // Single operand instructions that can take conditions

        OP_CLRF, OP_JMP, OP_LJMP, OP_NOT,

        // Branch operands

        OP_BRA, OP_BZ, OP_BNZ, OP_BGE, OP_BGT, OP_BLT, OP_BRC, OP_BRV,

        // Single operand instructions that have no explicit conditions

        OP_CLR, OP_TRAP, OP_NEG,

        // BAREOPs that can have conditions

        OP_HALT,  OP_RTU, OP_BUSY,

        // BAREOPs without conditions

        OP_BREAK, OP_NOOP,

        // Error condition--undefined operand

        OP_NONE

} LEXOPCODE;

#define DEFAULT_LINE    0x4e000000

class   ASMLINE {

public:

        char    m_state;

        int     m_lineno;

        virtual bool    isdefined(void) { return true; };

        virtual ~ASMLINE(void) {};

        virtual int     nlines(void) { return 0; }

        virtual unsigned int    eval(const int lno) { return DEFAULT_LINE; }

        virtual void    dump(FILE *fp) = 0;

};

class   AST { // The actual expression tree

public:

        // node type is one of:

        // 'B' a branch with two sides

        // 'N' a number

        // 'I' an identifier

        // 'A' ?? an address ?? would we need this?

        char    m_node_type;

        virtual bool    isdefined(void) = 0;

        virtual int     eval(void) = 0;

        virtual void    reduce(void) = 0;

        virtual void    dump(FILE *fp) = 0;

};

/*

class   ULINE : public ASMLINE  { // Unprocessed line of assembly

public:

        std::string     m_file, m_text;

        int             m_lineno;

        ULINE(const int line, const std::string file,

                const std::string text) : m_file(file), m_text(text),

                                        m_lineno(line) { m_state = 'U'; }

        class TLINE     *eval(void);

        int             nlines(void) { return 0; };

        virtual bool    isdefined(void) { return false; };

};

*/

class   ILINE : public ASMLINE { // Instruction line

public:

        ZIPI    m_in;

        ILINE(const ZIPI in) : m_in(in) { m_state = 'I'; m_lineno = yylineno; };

        virtual bool    isdefined(void) { return true; };

        virtual int     nlines(void) { return 1; }

        virtual unsigned int    eval(const int lno);

        void    dump(FILE *fp) { fprintf(fp, "IN: %08x\n", m_in); }

};

class   VLINE : public ASMLINE { // Void line

public:

        VLINE(void) { m_state = 'V'; m_lineno = yylineno; };

        virtual bool    isdefined(void) { return true; };

        virtual int     nlines(void) { return 0; }

        virtual unsigned int    eval(const int lno);

        void    dump(FILE *fp) { fprintf(fp, "void\n"); }

};

class   DLINE : public ASMLINE { // Data line

public:

        ZIPI    m_data;

        DLINE(const ZIPI dat) : m_data(dat) { m_state = 'D'; m_lineno = yylineno; };

        virtual bool    isdefined(void) { return true; };

        virtual int     nlines(void) { return 1; }

        virtual unsigned int    eval(const int lno);

        void    dump(FILE *fp) { fprintf(fp, "\tWORD\t%08d\n", m_data); }

};

class   LLINE : public ASMLINE { // List line -- one line that has turned into

                // many

public:

        int     m_nlines;

        ASMLINE **m_lines;

        LLINE(void) : m_nlines(0), m_lines(NULL) { m_state = 'L'; m_lineno = yylineno; };

        void addline(ASMLINE *line) ;

        virtual bool    isdefined(void);

        ~LLINE(void);

        virtual int     nlines(void) { return m_nlines; }

        virtual unsigned int    eval(const int lno);

        void    dump(FILE *fp) {

                for(int i=0; i<m_nlines; i++)

                        m_lines[i]->dump(fp);

        }

};

class   TLINE : public ASMLINE { // Expression tree

public:

        LEXOPCODE               m_opcode;

        ZPARSER::ZIPCOND        m_cond;

        AST                     *m_imm;

        ZPARSER::ZIPREG         m_opb, m_opa;

        TLINE(void) : m_opcode(OP_NONE), m_cond(ZPARSER::ZIPC_ALWAYS),

                        m_imm(NULL), m_opa(ZPARSER::ZIP_Rnone), m_opb(ZPARSER::ZIP_Rnone)

                        { m_state = 'T'; m_lineno = yylineno; };

        virtual bool    isdefined(void) {

                if (m_imm != NULL) {

                        bool answer = m_imm->isdefined();

                        return answer;

                } else return true;

        }

        ASMLINE *eval(void);

        ~TLINE(void) { if (m_imm) delete m_imm; }

        virtual int     nlines(void); //  { return 1; }

        virtual unsigned int    eval(const int lno);

        void    dump(FILE *fp);

};

class   AST_BRANCH : public AST { // The actual expression tree

public:

        int     m_op; // An operator

        AST     *m_left, *m_right;

        AST_BRANCH(int op, AST *l, AST *r)

                : m_op(op), m_left(l), m_right(r) { m_node_type = 'B';

                }

        bool    isdefined(void) {

                return ((m_left)&&(m_right)

                                &&(m_left->isdefined())

                                &&(m_right->isdefined()));

        }

        ~AST_BRANCH(void) { delete m_left; delete m_right; }

        int     eval(void);

        void    reduce(void);

        void    dump(FILE *fp) {

                fprintf(fp, "(");

                m_left->dump(fp);

                fprintf(fp, ") %c (", m_node_type);

                m_right->dump(fp);

                fprintf(fp, ")");

        }

};

class   AST_NUMBER : public AST { // A number at the base of the tree

public:

        int     m_val;

        AST_NUMBER(int val) : m_val(val) { m_node_type = 'N'; }

        bool    isdefined(void) { return true; }

        int     eval(void);

        void    reduce(void);

        void    dump(FILE *fp) { fprintf(fp, "%d", m_val); }

};

class   AST_IDENTIFIER : public AST { // An identifier within the expression tree

public:

        std::string     m_id;

        AST_IDENTIFIER(const char *id) : m_id(id) { m_node_type = 'I'; }

        AST_IDENTIFIER(AST *ida, const char *idb);

        bool    isdefined(void);

        int     eval(void);

        void    reduce(void);

        void    dump(FILE *fp) { fprintf(fp, "%s", m_id.c_str()); }

};

class   AST_LABEL : public AST { // An address label within the expression tree

        // This is special, because it cannot be evaluated without knowing

        // the PC value at this address

public:

        std::string     m_label;

        AST_LABEL(const char *id) : m_label(id) { m_node_type = 'L'; }

        bool    isdefined(void);

        int     eval(void);

        void    reduce(void);

        void    dump(FILE *fp) { fprintf(fp, "%s", m_label.c_str()); }

};

class   SAVED_ASMLINE {

public:

        unsigned int    m_pc;

        ASMLINE         *m_ln;

        SAVED_ASMLINE(const unsigned int pc, ASMLINE *ln) : m_pc(pc), m_ln(ln)

                {}

};

class   OBJFILE {

        typedef std::list<SAVED_ASMLINE> SVDTBL;

        SVDTBL          m_tbl;

        unsigned int    m_pc;

        FILE            *m_fp;

public:

        OBJFILE(void) { m_fp = NULL; m_pc = 0; }

        void open(const char *fname);

        void close(void) { fclose(m_fp); };

        unsigned int pc(void) { return m_pc; }

        void    operator+=(ASMLINE *ln);

        bool    reduce(void);

};

// The file we are building

extern  OBJFILE objcode;

// Functions for accessing and defining elements in our symbol table

extern  bool    stb_isdefined(const char *key);

extern  int     stb_value(const char *key);

extern  void    stb_define(const char *key, AST *value);

extern  void    gbl_define(const char *key, AST *value);

extern  bool    stb_isdefined(const std::string &key); //  { return stb_isdefined(key.c_str()); }

extern  int     stb_value(const std::string &key); //  { return stb_value(key.c_str()); }

extern  void    stb_define(const std::string &key, AST *value); //  { return stb_define(key.c_str(), value); }

extern  void    gbl_define(const std::string &key, AST *value); //  { return stb_define(key.c_str(), value); }

extern  void    create_new_context(void); // Create a new symbol table context

#endif // ASMDATA_H