/** @file main.c
    pic14 specific general functions.

    Note that mlh prepended _pic14_ on the static functions.  Makes
    it easier to set a breakpoint using the debugger.
*/
#include "common.h"
#include "dbuf_string.h"
#include "SDCCmacro.h"

#include "device.h"
#include "gen.h"
#include "glue.h"
#include "main.h"
#include "pcode.h"
#include "ralloc.h"

/*
 * Imports
 */
extern set *dataDirsSet;
extern set *includeDirsSet;
extern set *libDirsSet;
extern set *libPathsSet;
extern set *linkOptionsSet;


pic14_options_t pic14_options;
int debug_verbose = 0;


#define OPTION_STACK_SIZE         "--stack-size"

static char _defaultRules[] =
{
#include "peeph.rul"
};

static OPTION _pic14_poptions[] =
  {
    { 0, "--debug-xtra",   &debug_verbose, "show more debug info in assembly output" },
    { 0, "--no-pcode-opt", &pic14_options.disable_df, "disable (slightly faulty) optimization on pCode" },
    { 0, OPTION_STACK_SIZE, &options.stack_size, "sets the size if the argument passing stack (default: 16, minimum: 4)", CLAT_INTEGER },
    { 0, "--no-extended-instructions", &pic14_options.no_ext_instr, "forbid use of the extended instruction set (e.g., ADDFSR)" },
    { 0, "--no-warn-non-free", &pic14_options.no_warn_non_free, "suppress warning on absent --use-non-free option" },
    { 0, NULL, NULL, NULL }
  };

/* list of key words used by pic14 */
static char *_pic14_keywords[] =
{
  "at",
  //"bit",
  "code",
  "critical",
  "data",
  "far",
  "idata",
  "interrupt",
  "naked",
  "near",
  //"pdata",
  "reentrant",
  "sfr",
  //"sbit",
  "using",
  "xdata",
  NULL
};

static int regParmFlg = 0;  /* determine if we can register a parameter */


/** $1 is always the basename.
    $2 is always the output file.
    $3 varies
    $l is the list of extra options that should be there somewhere...
    MUST be terminated with a NULL.
*/
/*
static const char *_linkCmd[] =
{
  "gplink", "$l", "-w", "-r", "-o \"$2\"", "\"$1\"", "$3", NULL
};
*/

static const char *_asmCmd[] =
{
  "gpasm", "$l", "$3", "-o", "$2", "-c", "$1.asm", NULL
};

static void
_pic14_init (void)
{
  asm_addTree (&asm_asxxxx_mapping);
  memset (&pic14_options, 0, sizeof (pic14_options));
}

static void
_pic14_reset_regparm (struct sym_link *funcType)
{
  regParmFlg = 0;
}

static int
_pic14_regparm (sym_link * l, bool reentrant)
{
/* for this processor it is simple
  can pass only the first parameter in a register */
  //if (regParmFlg)
  //  return 0;

  regParmFlg++;// = 1;
  return 1;
}

static bool
_pic14_parseOptions (int *pargc, char **argv, int *i)
{
    /* TODO: allow port-specific command line options to specify
    * segment names here.
    */
    return FALSE;
}

static void
_pic14_finaliseOptions (void)
{
  struct dbuf_s dbuf;

  pCodeInitRegisters();

  port->mem.default_local_map = data;
  port->mem.default_globl_map = data;

  dbuf_init (&dbuf, 512);
  dbuf_printf (&dbuf, "-D__SDCC_PROCESSOR=\"%s\"", port->processor);
  addSet (&preArgvSet, Safe_strdup (dbuf_detach_c_str (&dbuf)));

    {
      char *upperProc, *p1, *p2;
      int len;

      dbuf_set_length (&dbuf, 0);
      len = strlen (port->processor);
      upperProc = Safe_malloc (len);
      for (p1 = port->processor, p2 = upperProc; *p1; ++p1, ++p2)
        {
          *p2 = toupper (*p1);
        }
      dbuf_append (&dbuf, "-D__SDCC_PIC", sizeof ("-D__SDCC_PIC") - 1);
      dbuf_append (&dbuf, upperProc, len);
      addSet (&preArgvSet, dbuf_detach_c_str (&dbuf));
    }

  /* This is valid after calling pCodeInitRegisters */
  if (pic14_getPIC()->isEnhancedCore)
    {
      dbuf_set_length (&dbuf, 0);
      dbuf_printf (&dbuf, "-D__SDCC_PIC14_ENHANCED");
      addSet (&preArgvSet, Safe_strdup (dbuf_detach_c_str (&dbuf)));
    }

  /* Report the actual stack size */
  {
    int size;
    pic14_getSharedStack(NULL, NULL, &size);

    /* non-enhanced cores take PSAVE, SSAVE and WSAVE from stack */
    if (!pic14_getPIC()->isEnhancedCore)
      size -= 3;

    /* Actual stack size includes WREG and STK00, ... */
    dbuf_set_length (&dbuf, 0);
    dbuf_printf (&dbuf, "-D__SDCC_PIC14_STACK_SIZE=%d", size + 1);
    addSet (&preArgvSet, Safe_strdup (dbuf_detach_c_str (&dbuf)));
  }

  if (!pic14_options.no_warn_non_free && !options.use_non_free)
    {
      fprintf(stderr,
              "WARNING: Command line option --use-non-free not present.\n"
              "         When compiling for PIC14/PIC16, please provide --use-non-free\n"
              "         to get access to device headers and libraries.\n"
              "         If you do not use these, you may provide --no-warn-non-free\n"
              "         to suppress this warning (not recommended).\n");
    } // if

}

static void
_pic14_setDefaultOptions (void)
{
}

static const char *
_pic14_getRegName (const struct reg_info *reg)
{
  if (reg)
    return reg->name;
  return "err";
}

static void
_pic14_genAssemblerPreamble (FILE * of)
{
  char * name = processor_base_name();

  if(!name) {

    name = "16f877";
    fprintf(stderr,"WARNING: No Pic has been selected, defaulting to %s\n",name);
  }

  fprintf (of, "\tlist\tp=%s\n",name);
  fprintf (of, "\tradix dec\n");
  fprintf (of, "\tinclude \"p%s.inc\"\n",name);
}

/* Generate interrupt vector table. */
static int
_pic14_genIVT (struct dbuf_s * oBuf, symbol ** interrupts, int maxInterrupts)
{
  /* Let the default code handle it. */
  return FALSE;
}

static bool
_hasNativeMulFor (iCode *ic, sym_link *left, sym_link *right)
{
#if 0
  if ( ic->op != '*')
  {
    return FALSE;
  }

  /* multiply chars in-place */
  if (getSize(left) == 1 && getSize(right) == 1)
    return TRUE;
#endif

  /* use library functions for more complex maths */
  return FALSE;
}

/* Indicate which extended bit operations this port supports */
static bool
hasExtBitOp (int op, int size)
{
  if (op == RRC
    || op == RLC
    || op == GETABIT
    /* || op == GETHBIT */ /* GETHBIT doesn't look complete for PIC */
    )
    return TRUE;
  else
    return FALSE;
}

/* Indicate the expense of an access to an output storage class */
static int
oclsExpense (struct memmap *oclass)
{
  /* The IN_FARSPACE test is compatible with historical behaviour, */
  /* but I don't think it is applicable to PIC. If so, please feel */
  /* free to remove this test -- EEP */
  if (IN_FARSPACE(oclass))
    return 1;

  return 0;
}

static void
_pic14_do_link (void)
{
  /*
   * link command format:
   * {linker} {incdirs} {lflags} -o {outfile} {spec_ofiles} {ofiles} {libs}
   *
   */
#define LFRM  "{linker} {incdirs} {sysincdirs} {lflags} -w -r -o {outfile} {user_ofile} {spec_ofiles} {ofiles} {libs}"
  hTab *linkValues = NULL;
  char *lcmd;
  set *tSet = NULL;
  int ret;
  char * procName;

  shash_add (&linkValues, "linker", "gplink");

  /* LIBRARY SEARCH DIRS */
  mergeSets (&tSet, libPathsSet);
  mergeSets (&tSet, libDirsSet);
  shash_add (&linkValues, "incdirs", joinStrSet (processStrSet (tSet, "-I", NULL, shell_escape)));

  joinStrSet (processStrSet (libDirsSet, "-I", NULL, shell_escape));
  shash_add (&linkValues, "sysincdirs", joinStrSet (processStrSet (libDirsSet, "-I", NULL, shell_escape)));

  shash_add (&linkValues, "lflags", joinStrSet (linkOptionsSet));

  {
    char *s = shell_escape (fullDstFileName ? fullDstFileName : dstFileName);

    shash_add (&linkValues, "outfile", s);
    Safe_free (s);
  }

  if (fullSrcFileName)
    {
      struct dbuf_s dbuf;
      char *s;

      dbuf_init (&dbuf, 128);

      dbuf_append_str (&dbuf, fullDstFileName ? fullDstFileName : dstFileName);
      dbuf_append (&dbuf, ".o", 2);
      s = shell_escape (dbuf_c_str (&dbuf));
      dbuf_destroy (&dbuf);
      shash_add (&linkValues, "user_ofile", s);
      Safe_free (s);
    }

  shash_add (&linkValues, "ofiles", joinStrSet (processStrSet (relFilesSet, NULL, NULL, shell_escape)));

  /* LIBRARIES */
  procName = processor_base_name ();
  if (!procName)
    procName = "16f877";

  addSet (&libFilesSet, Safe_strdup (pic14_getPIC()->isEnhancedCore ?
          "libsdcce.lib" : "libsdcc.lib"));

    {
      struct dbuf_s dbuf;

      dbuf_init (&dbuf, 128);
      dbuf_append (&dbuf, "pic", sizeof ("pic") - 1);
      dbuf_append_str (&dbuf, procName);
      dbuf_append (&dbuf, ".lib", sizeof (".lib") - 1);
      addSet (&libFilesSet, dbuf_detach_c_str (&dbuf));
    }

  shash_add (&linkValues, "libs", joinStrSet (processStrSet (libFilesSet, NULL, NULL, shell_escape)));

  lcmd = msprintf(linkValues, LFRM);
  ret = sdcc_system (lcmd);
  Safe_free (lcmd);

  if (ret)
    exit (1);
}

/* Globals */
PORT pic_port =
{
  TARGET_ID_PIC14,
  "pic14",
  "MCU pic",        /* Target name */
  "",               /* Processor */
  {
    picglue,
    TRUE,           /* Emit glue around main */
    NO_MODEL,
    NO_MODEL,
    NULL,           /* model == target */
  },
  {
    _asmCmd,
    NULL,
    "-g",           /* options with --debug */
    NULL,           /* options without --debug */
    0,
    ".asm",
    NULL            /* no do_assemble function */
  },
  {
    NULL,
    NULL,
    _pic14_do_link, /* own do link function */
    ".o",
    0
  },
  {                 /* Peephole optimizer */
    _defaultRules
  },
  {
    /* Sizes: char, short, int, long, long long, near ptr, far ptr, gptr, func ptr, banked func ptr, bit, float */
    1, 2, 2, 4, 8, 2, 2, 3, 2, 3, 1, 4
    /* TSD - I changed the size of gptr from 3 to 1. However, it should be
       2 so that we can accomodate the PIC's with 4 register banks (like the
       16f877)
     */
  },
  /* tags for generic pointers */
  { 0x00, 0x00, 0x00, 0x80 },   /* far, near, xstack, code */
  {
    "XSEG    (XDATA)",
    "STACK   (DATA)",
    "code",
    "DSEG    (DATA)",
    "ISEG    (DATA)",
    NULL, /* pdata */
    "XSEG    (XDATA)",
    "BSEG    (BIT)",
    "RSEG    (DATA)",
    "GSINIT  (CODE)",
    "udata_ovr",
    "GSFINAL (CODE)",
    "HOME        (CODE)",
    NULL, // xidata
    NULL, // xinit
    "CONST   (CODE)",       // const_name - const data (code or not)
    "CABS    (ABS,CODE)",   // cabs_name - const absolute data (code or not)
    "XABS    (ABS,XDATA)",  // xabs_name - absolute xdata
    "IABS    (ABS,DATA)",   // iabs_name - absolute data
    NULL,                   // name of segment for initialized variables
    NULL,                   // name of segment for copies of initialized variables in code space
    NULL,
    NULL,
    1,                      // code is read only
    1                       // No fancy alignments supported.
  },
  { NULL, NULL },
  {
    +1, 1, 4, 1, 1, 0, 0
  },
    /* pic14 has an 8 bit mul */
  {
    -1, FALSE
  },
  {
    pic14_emitDebuggerSymbol
  },
  {
    255/3,      /* maxCount */
    3,          /* sizeofElement */
    /* The rest of these costs are bogus. They approximate */
    /* the behavior of src/SDCCicode.c 1.207 and earlier.  */
    {4,4,4},    /* sizeofMatchJump[] */
    {0,0,0},    /* sizeofRangeCompare[] */
    0,          /* sizeofSubtract */
    3,          /* sizeofDispatch */
  },
  "_",
  _pic14_init,
  _pic14_parseOptions,
  _pic14_poptions,
  NULL,
  _pic14_finaliseOptions,
  _pic14_setDefaultOptions,
  pic14_assignRegisters,
  _pic14_getRegName,
  0,
  NULL,
  _pic14_keywords,
  _pic14_genAssemblerPreamble,
  NULL,         /* no genAssemblerEnd */
  _pic14_genIVT,
  NULL, // _pic14_genXINIT
  NULL,         /* genInitStartup */
  _pic14_reset_regparm,
  _pic14_regparm,
  NULL,         /* process a pragma */
  NULL,
  _hasNativeMulFor,
  hasExtBitOp,  /* hasExtBitOp */
  oclsExpense,  /* oclsExpense */
  FALSE,
//  TRUE,       /* little endian */
  FALSE,        /* little endian - PIC code enumlates big endian */
  0,            /* leave lt */
  0,            /* leave gt */
  1,            /* transform <= to ! > */
  1,            /* transform >= to ! < */
  1,            /* transform != to !(a == b) */
  0,            /* leave == */
  FALSE,        /* No array initializer support. */
  0,            /* no CSE cost estimation yet */
  NULL,         /* no builtin functions */
  GPOINTER,     /* treat unqualified pointers as "generic" pointers */
  1,            /* reset labelKey to 1 */
  1,            /* globals & local static allowed */
  0,            /* Number of registers handled in the tree-decomposition-based register allocator in SDCCralloc.hpp */
  PORT_MAGIC
};