assembler.h

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#ifndef __ASSEMBLER_H__
#define __ASSEMBLER_H__

/*
 * "Copyright (c) 2014 by Fritz Sieker."
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written
 * agreement is hereby granted, provided that the above copyright notice
 * and the following two paragraphs appear in all copies of this software.
 *
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
 * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE AUTHOR
 * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
 * BASIS, AND THE AUTHOR NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
 * UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 */

#include "lc3.h"

#include "symbol.h"

#ifndef LC3AS_VAR
#define LC3AS_VAR extern
#endif

#define ERR_OPEN_READ       "could not open '%s' for reading."
#define ERR_OPEN_WRITE      "could not open '%s' for writing."
#define ERR_LINE_TOO_LONG   "source line too long (max is %d)"
#define ERR_NO_ORIG         "no .ORIG directive found"
#define ERR_NO_END          "no .END directive found"
#define ERR_ORIG_NOT_1ST    "instruction(s) appear before .ORIG"
#define ERR_END_NOT_LAST    "instruction(s) appear after .END"
#define ERR_MISSING_ORIG    ".ORIG not found"
#define ERR_MISSING_END     ".END not found"
#define ERR_EXPECTED_COMMA  "expected comma, got '%s'"
#define ERR_EXPECTED_REG    "expected register (R0-R7), got '%s'"
#define ERR_EXPECT_REG_IMM  "expected register or immediate, got '%s'"
#define ERR_BAD_LABEL       "label '%s' contains illegal characters"
#define ERR_MISSING_OP      "expected LC3 op, got '%s'"
#define ERR_MISSING_OPERAND "too few operand(s)"
#define ERR_EXTRA_OPERAND   "extra operand(s) '%s'"
#define ERR_DUPLICATE_LABEL "label '%s' previosly defined"
#define ERR_MISSING_LABEL   "label '%s' never defined"
#define ERR_BAD_PCOFFSET    "PCoffset to '%s' out of range"
#define ERR_BAD_IMM         "immediate '%s' (bad format)"
#define ERR_IMM_TOO_BIG     "immediate '%s' out of range"
#define ERR_EXPECTED_STR    "expected quoted string, got '%s'"
#define ERR_BAD_STR         "unterminated string '%s'"

LC3AS_VAR int srcLineNum;

LC3AS_VAR int currAddr;

LC3AS_VAR int numErrors;

typedef struct line_info line_info_t;

struct line_info {
  line_info_t* next;         
  int          lineNum;      
  int          address;      
  int          machineCode;  
  opcode_t     opcode;       
  int          form;         
  int          reg1;         
  int          reg2;         
  int          reg3;         
  int          immediate;    
  char*        reference;    
};


void asm_error (char* msg, ...);

void asm_init (void);

void asm_init_line_info (line_info_t* info);

void asm_pass_one (char* asm_file_name, char* sym_file_name);

void asm_pass_two(char* obj_file_name);

void asm_print_line_info (line_info_t* info);

void asm_term (void);

char* check_for_label (char* token);

void check_line_syntax (char *token);

void encode_operand (operand_t operand);

void encode_PCoffset_or_error (int width);

void get_comma_or_error (void);

void get_immediate_or_error (char* token, int width, int isSigned);

void get_PCoffset_or_error (char* token);

void get_operand (operand_t operand, char* token);

int get_reg_or_error (char* token);

FILE *open_read_or_error (char* file_name);

FILE *open_write_or_error (char* file_name);

void scan_operands (operands_t operands);

void update_address (void);

#endif