/* CGEN generic assembler support code.
  Copyright (C) 1996-2024 Free Software Foundation, Inc.

  This file is part of libopcodes.

  This library 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, or (at your option)
  any later version.

  It 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 this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#include "sysdep.h"
#include <stdio.h>
#include "ansidecl.h"
#include "libiberty.h"
#include "safe-ctype.h"
#include "bfd.h"
#include "symcat.h"
#include "opcode/cgen.h"
#include "opintl.h"

static CGEN_INSN_LIST *  hash_insn_array      (CGEN_CPU_DESC, const CGEN_INSN *, int, int, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
static CGEN_INSN_LIST *  hash_insn_list       (CGEN_CPU_DESC, const CGEN_INSN_LIST *, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
static void              build_asm_hash_table (CGEN_CPU_DESC);

/* Set the cgen_parse_operand_fn callback.  */

void
cgen_set_parse_operand_fn (CGEN_CPU_DESC cd, cgen_parse_operand_fn fn)
{
 cd->parse_operand_fn = fn;
}

/* Called whenever starting to parse an insn.  */

void
cgen_init_parse_operand (CGEN_CPU_DESC cd)
{
 /* This tells the callback to re-initialize.  */
 (void) (* cd->parse_operand_fn)
   (cd, CGEN_PARSE_OPERAND_INIT, NULL, 0, 0, NULL, NULL);
}

/* Subroutine of build_asm_hash_table to add INSNS to the hash table.

  COUNT is the number of elements in INSNS.
  ENTSIZE is sizeof (CGEN_IBASE) for the target.
  ??? No longer used but leave in for now.
  HTABLE points to the hash table.
  HENTBUF is a pointer to sufficiently large buffer of hash entries.
  The result is a pointer to the next entry to use.

  The table is scanned backwards as additions are made to the front of the
  list and we want earlier ones to be preferred.  */

static CGEN_INSN_LIST *
hash_insn_array (CGEN_CPU_DESC cd,
                const CGEN_INSN *insns,
                int count,
                int entsize ATTRIBUTE_UNUSED,
                CGEN_INSN_LIST **htable,
                CGEN_INSN_LIST *hentbuf)
{
 int i;

 for (i = count - 1; i >= 0; --i, ++hentbuf)
   {
     unsigned int hash;
     const CGEN_INSN *insn = &insns[i];

     if (! (* cd->asm_hash_p) (insn))
       continue;
     hash = (* cd->asm_hash) (CGEN_INSN_MNEMONIC (insn));
     hentbuf->next = htable[hash];
     hentbuf->insn = insn;
     htable[hash] = hentbuf;
   }

 return hentbuf;
}

/* Subroutine of build_asm_hash_table to add INSNS to the hash table.
  This function is identical to hash_insn_array except the insns are
  in a list.  */

static CGEN_INSN_LIST *
hash_insn_list (CGEN_CPU_DESC cd,
               const CGEN_INSN_LIST *insns,
               CGEN_INSN_LIST **htable,
               CGEN_INSN_LIST *hentbuf)
{
 const CGEN_INSN_LIST *ilist;

 for (ilist = insns; ilist != NULL; ilist = ilist->next, ++ hentbuf)
   {
     unsigned int hash;

     if (! (* cd->asm_hash_p) (ilist->insn))
       continue;
     hash = (* cd->asm_hash) (CGEN_INSN_MNEMONIC (ilist->insn));
     hentbuf->next = htable[hash];
     hentbuf->insn = ilist->insn;
     htable[hash] = hentbuf;
   }

 return hentbuf;
}

/* Build the assembler instruction hash table.  */

static void
build_asm_hash_table (CGEN_CPU_DESC cd)
{
 int count = cgen_insn_count (cd) + cgen_macro_insn_count (cd);
 CGEN_INSN_TABLE *insn_table = &cd->insn_table;
 CGEN_INSN_TABLE *macro_insn_table = &cd->macro_insn_table;
 unsigned int hash_size = cd->asm_hash_size;
 CGEN_INSN_LIST *hash_entry_buf;
 CGEN_INSN_LIST **asm_hash_table;
 CGEN_INSN_LIST *asm_hash_table_entries;

 /* The space allocated for the hash table consists of two parts:
    the hash table and the hash lists.  */

 asm_hash_table = (CGEN_INSN_LIST **)
   xmalloc (hash_size * sizeof (CGEN_INSN_LIST *));
 memset (asm_hash_table, 0, hash_size * sizeof (CGEN_INSN_LIST *));
 asm_hash_table_entries = hash_entry_buf = (CGEN_INSN_LIST *)
   xmalloc (count * sizeof (CGEN_INSN_LIST));

 /* Add compiled in insns.
    Don't include the first one as it is a reserved entry.  */
 /* ??? It was the end of all hash chains, and also the special
    "invalid insn" marker.  May be able to do it differently now.  */

 hash_entry_buf = hash_insn_array (cd,
                                   insn_table->init_entries + 1,
                                   insn_table->num_init_entries - 1,
                                   insn_table->entry_size,
                                   asm_hash_table, hash_entry_buf);

 /* Add compiled in macro-insns.  */

 hash_entry_buf = hash_insn_array (cd, macro_insn_table->init_entries,
                                   macro_insn_table->num_init_entries,
                                   macro_insn_table->entry_size,
                                   asm_hash_table, hash_entry_buf);

 /* Add runtime added insns.
    Later added insns will be preferred over earlier ones.  */

 hash_entry_buf = hash_insn_list (cd, insn_table->new_entries,
                                  asm_hash_table, hash_entry_buf);

 /* Add runtime added macro-insns.  */

 hash_insn_list (cd, macro_insn_table->new_entries,
                 asm_hash_table, hash_entry_buf);

 cd->asm_hash_table = asm_hash_table;
 cd->asm_hash_table_entries = asm_hash_table_entries;
}

/* Return the first entry in the hash list for INSN.  */

CGEN_INSN_LIST *
cgen_asm_lookup_insn (CGEN_CPU_DESC cd, const char *insn)
{
 unsigned int hash;

 if (cd->asm_hash_table == NULL)
   build_asm_hash_table (cd);

 hash = (* cd->asm_hash) (insn);
 return cd->asm_hash_table[hash];
}

/* Keyword parser.
  The result is NULL upon success or an error message.
  If successful, *STRP is updated to point passed the keyword.

  ??? At present we have a static notion of how to pick out a keyword.
  Later we can allow a target to customize this if necessary [say by
  recording something in the keyword table].  */

const char *
cgen_parse_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
                   const char **strp,
                   CGEN_KEYWORD *keyword_table,
                   long *valuep)
{
 const CGEN_KEYWORD_ENTRY *ke;
 char buf[256];
 const char *p,*start;

 if (keyword_table->name_hash_table == NULL)
   (void) cgen_keyword_search_init (keyword_table, NULL);

 p = start = *strp;

 /* Allow any first character.  This is to make life easier for
    the fairly common case of suffixes, eg. 'ld.b.w', where the first
    character of the suffix ('.') is special.  */
 if (*p)
   ++p;

 /* Allow letters, digits, and any special characters.  */
 while (((p - start) < (int) sizeof (buf))
        && *p
        && (ISALNUM (*p)
            || *p == '_'
            || strchr (keyword_table->nonalpha_chars, *p)))
   ++p;

 if (p - start >= (int) sizeof (buf))
   {
     /* All non-empty CGEN keywords can fit into BUF.  The only thing
        we can match here is the empty keyword.  */
     buf[0] = 0;
   }
 else
   {
     memcpy (buf, start, p - start);
     buf[p - start] = 0;
   }

 ke = cgen_keyword_lookup_name (keyword_table, buf);

 if (ke != NULL)
   {
     *valuep = ke->value;
     /* Don't advance pointer if we recognized the null keyword.  */
     if (ke->name[0] != 0)
       *strp = p;
     return NULL;
   }

 return "unrecognized keyword/register name";
}

/* Parse a small signed integer parser.
  ??? VALUEP is not a bfd_vma * on purpose, though this is confusing.
  Note that if the caller expects a bfd_vma result, it should call
  cgen_parse_address.  */

const char *
cgen_parse_signed_integer (CGEN_CPU_DESC cd,
                          const char **strp,
                          int opindex,
                          long *valuep)
{
 bfd_vma value;
 enum cgen_parse_operand_result result;
 const char *errmsg;

 errmsg = (* cd->parse_operand_fn)
   (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
    &result, &value);
 /* FIXME: Examine `result'.  */
 if (!errmsg)
   {
     /* Handle the case where a hex value is parsed on a 64-bit host.
        A value like 0xffffe000 is clearly intended to be a negative
        16-bit value, but on a 64-bit host it will be parsed by gas
        as 0x00000000ffffe000.

        The shifts below are designed not to produce compile time
        warnings on a 32-bit host.  */
     if (sizeof (value) > 4
         && result == CGEN_PARSE_OPERAND_RESULT_NUMBER
         && value > 0
         && (value & 0x80000000)
         && ((value >> 31) == 1))
       value |= ((bfd_vma) -1) << 31;

     *valuep = value;
   }
 return errmsg;
}

/* Parse a small unsigned integer parser.
  ??? VALUEP is not a bfd_vma * on purpose, though this is confusing.
  Note that if the caller expects a bfd_vma result, it should call
  cgen_parse_address.  */

const char *
cgen_parse_unsigned_integer (CGEN_CPU_DESC cd,
                            const char **strp,
                            int opindex,
                            unsigned long *valuep)
{
 bfd_vma value;
 enum cgen_parse_operand_result result;
 const char *errmsg;

 errmsg = (* cd->parse_operand_fn)
   (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
    &result, &value);
 /* FIXME: Examine `result'.  */
 if (!errmsg)
   *valuep = value;
 return errmsg;
}

/* Address parser.  */

const char *
cgen_parse_address (CGEN_CPU_DESC cd,
                   const char **strp,
                   int opindex,
                   int opinfo,
                   enum cgen_parse_operand_result *resultp,
                   bfd_vma *valuep)
{
 bfd_vma value;
 enum cgen_parse_operand_result result_type;
 const char *errmsg;

 errmsg = (* cd->parse_operand_fn)
   (cd, CGEN_PARSE_OPERAND_ADDRESS, strp, opindex, opinfo,
    &result_type, &value);
 /* FIXME: Examine `result'.  */
 if (!errmsg)
   {
     if (resultp != NULL)
       *resultp = result_type;
     *valuep = value;
   }
 return errmsg;
}

/* Signed integer validation routine.  */

const char *
cgen_validate_signed_integer (long value, long min, long max)
{
 if (value < min || value > max)
   {
     static char buf[100];

     /* xgettext:c-format */
     sprintf (buf, _("operand out of range (%ld not between %ld and %ld)"),
                     value, min, max);
     return buf;
   }

 return NULL;
}

/* Unsigned integer validation routine.
  Supplying `min' here may seem unnecessary, but we also want to handle
  cases where min != 0 (and max > LONG_MAX).  */

const char *
cgen_validate_unsigned_integer (unsigned long value,
                               unsigned long min,
                               unsigned long max)
{
 if (value < min || value > max)
   {
     static char buf[100];

     /* xgettext:c-format */
     sprintf (buf, _("operand out of range (%lu not between %lu and %lu)"),
              value, min, max);
     return buf;
   }

 return NULL;
}

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