/* scfidw2gen.c - Support for emission of synthesized Dwarf2 CFI.
  Copyright (C) 2023 Free Software Foundation, Inc.

  This file is part of GAS, the GNU Assembler.

  GAS 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.

  GAS 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 GAS; see the file COPYING.  If not, write to the Free
  Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  02110-1301, USA.  */

#include "as.h"
#include "ginsn.h"
#include "scfi.h"
#include "dw2gencfi.h"
#include "subsegs.h"
#include "scfidw2gen.h"

#if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN)

static bool scfi_ignore_warn_once;

static void
dot_scfi_ignore (int ignored ATTRIBUTE_UNUSED)
{
 gas_assert (flag_synth_cfi);

 if (!scfi_ignore_warn_once)
   {
     as_warn (_("SCFI ignores most user-specified CFI directives"));
     scfi_ignore_warn_once = true;
   }
 ignore_rest_of_line ();
}

static void
scfi_process_cfi_label (void)
{
 char *name;
 ginsnS *ginsn;

 name = read_symbol_name ();
 if (name == NULL)
   return;

 /* Add a new ginsn.  */
 ginsn = ginsn_new_phantom (symbol_temp_new_now ());
 frch_ginsn_data_append (ginsn);

 scfi_op_add_cfi_label (ginsn, name);
 /* TODO.  */
 // free (name);

 demand_empty_rest_of_line ();
}

static void
scfi_process_cfi_signal_frame (void)
{
 ginsnS *ginsn;

 ginsn = ginsn_new_phantom (symbol_temp_new_now ());
 frch_ginsn_data_append (ginsn);

 scfi_op_add_signal_frame (ginsn);
}

static void
dot_scfi (int arg)
{
 switch (arg)
   {
     case CFI_label:
       scfi_process_cfi_label ();
       break;
     case CFI_signal_frame:
       scfi_process_cfi_signal_frame ();
       break;
     default:
       abort ();
   }
}

const pseudo_typeS scfi_pseudo_table[] =
 {
   { "cfi_sections", dot_cfi_sections, 0 }, /* No ignore.  */
   { "cfi_signal_frame", dot_scfi, CFI_signal_frame }, /* No ignore.  */
   { "cfi_label", dot_scfi, CFI_label }, /* No ignore.  */
   { "cfi_startproc", dot_scfi_ignore, 0 },
   { "cfi_endproc", dot_scfi_ignore, 0 },
   { "cfi_fde_data", dot_scfi_ignore, 0 },
   { "cfi_def_cfa", dot_scfi_ignore, 0 },
   { "cfi_def_cfa_register", dot_scfi_ignore, 0 },
   { "cfi_def_cfa_offset", dot_scfi_ignore, 0 },
   { "cfi_adjust_cfa_offset", dot_scfi_ignore, 0 },
   { "cfi_offset", dot_scfi_ignore, 0 },
   { "cfi_rel_offset", dot_scfi_ignore, 0 },
   { "cfi_register", dot_scfi_ignore, 0 },
   { "cfi_return_column", dot_scfi_ignore, 0 },
   { "cfi_restore", dot_scfi_ignore, 0 },
   { "cfi_undefined", dot_scfi_ignore, 0 },
   { "cfi_same_value", dot_scfi_ignore, 0 },
   { "cfi_remember_state", dot_scfi_ignore, 0 },
   { "cfi_restore_state", dot_scfi_ignore, 0 },
   { "cfi_window_save", dot_scfi_ignore, 0 },
   { "cfi_negate_ra_state", dot_scfi_ignore, 0 },
   { "cfi_escape", dot_scfi_ignore, 0 },
   { "cfi_personality", dot_scfi_ignore, 0 },
   { "cfi_personality_id", dot_scfi_ignore, 0 },
   { "cfi_lsda", dot_scfi_ignore, 0 },
   { "cfi_val_encoded_addr", dot_scfi_ignore, 0 },
   { "cfi_inline_lsda", dot_scfi_ignore, 0 },
   { "cfi_val_offset", dot_scfi_ignore, 0 },
   { NULL, NULL, 0 }
 };

void
scfi_dot_cfi_startproc (const symbolS *start_sym)
{
 if (frchain_now->frch_cfi_data != NULL)
   {
     as_bad (_("SCFI: missing previous SCFI endproc marker"));
     return;
   }

 cfi_new_fde ((symbolS *)start_sym);

 cfi_set_sections ();

 frchain_now->frch_cfi_data->cur_cfa_offset = 0;

 /* By default, SCFI machinery assumes .cfi_startproc is used without
    parameter simple.  */
 tc_cfi_frame_initial_instructions ();

 if ((all_cfi_sections & CFI_EMIT_target) != 0)
   tc_cfi_startproc ();
}

void
scfi_dot_cfi_endproc (const symbolS *end_sym)
{
 struct fde_entry *fde_last;

 if (frchain_now->frch_cfi_data == NULL)
   {
     as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
     return;
   }

 fde_last = frchain_now->frch_cfi_data->cur_fde_data;
 cfi_set_last_fde (fde_last);

 cfi_end_fde ((symbolS *)end_sym);

 if ((all_cfi_sections & CFI_EMIT_target) != 0)
   tc_cfi_endproc (fde_last);
}

void
scfi_dot_cfi (int arg, unsigned reg1, unsigned reg2, offsetT offset,
             const char *name, const symbolS *advloc)
{
 if (frchain_now->frch_cfi_data == NULL)
   {
     as_bad (_("CFI instruction used without previous .cfi_startproc"));
     return;
   }

 /* If the last address was not at the current PC, advance to current.  */
 if (frchain_now->frch_cfi_data->last_address != advloc)
   cfi_add_advance_loc ((symbolS *)advloc);

 switch (arg)
   {
   case DW_CFA_offset:
     cfi_add_CFA_offset (reg1, offset);
     break;

   case DW_CFA_val_offset:
     cfi_add_CFA_val_offset (reg1, offset);
     break;

   case CFI_rel_offset:
     cfi_add_CFA_offset (reg1,
                         offset - frchain_now->frch_cfi_data->cur_cfa_offset);
     break;

   case DW_CFA_def_cfa:
     cfi_add_CFA_def_cfa (reg1, offset);
     break;

   case DW_CFA_register:
     cfi_add_CFA_register (reg1, reg2);
     break;

   case DW_CFA_def_cfa_register:
     cfi_add_CFA_def_cfa_register (reg1);
     break;

   case DW_CFA_def_cfa_offset:
     cfi_add_CFA_def_cfa_offset (offset);
     break;

   case CFI_adjust_cfa_offset:
     cfi_add_CFA_def_cfa_offset (frchain_now->frch_cfi_data->cur_cfa_offset
                                 + offset);
     break;

   case DW_CFA_restore:
     cfi_add_CFA_restore (reg1);
     break;

   case DW_CFA_remember_state:
     cfi_add_CFA_remember_state ();
     break;

   case DW_CFA_restore_state:
     cfi_add_CFA_restore_state ();
     break;

   case CFI_label:
     cfi_add_label (name);
     break;

   case CFI_signal_frame:
     frchain_now->frch_cfi_data->cur_fde_data->signal_frame = 1;
     break;

/*
   case DW_CFA_undefined:
     for (;;)
       {
         reg1 = cfi_parse_reg ();
         cfi_add_CFA_undefined (reg1);
         SKIP_WHITESPACE ();
         if (*input_line_pointer != ',')
           break;
         ++input_line_pointer;
       }
     break;

   case DW_CFA_same_value:
     reg1 = cfi_parse_reg ();
     cfi_add_CFA_same_value (reg1);
     break;

   case CFI_return_column:
     reg1 = cfi_parse_reg ();
     cfi_set_return_column (reg1);
     break;

   case DW_CFA_GNU_window_save:
     cfi_add_CFA_insn (DW_CFA_GNU_window_save);
     break;

*/
   default:
     abort ();
   }
}

#endif

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