i370.c

gcc-2.95.3 Linux下最常用的C编译器

/* Subroutines for insn-output.c for System/370.
   Copyright (C) 1989, 1993, 1995, 1997 Free Software Foundation, Inc.
   Contributed by Jan Stein ([e-mail]).
   Modified for MVS C/370 by Dave Pitts ([e-mail])

This file is part of GNU CC.

GNU CC 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 2, or (at your option)
any later version.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "config.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "real.h"
#include "insn-config.h"
#include "conditions.h"
#include "insn-flags.h"
#include "output.h"
#include "insn-attr.h"
#include "flags.h"
#include "recog.h"
#ifdef sun
#include <sys/types.h>
#include <ctype.h>
#endif
#include <time.h>


/* Label node, this structure is used to keep track of labels on the
   current page.  */
typedef struct label_node
  {
    struct label_node *label_next;
    int label_id;
    int label_page;
  }
label_node_t;

/* Is 1 when a label has been generated and the base register must be
   reloaded.  */
int mvs_label_emitted = 0;

/* Current function starting base page.  */
int function_base_page;

/* Length of the current page code.  */
int mvs_page_code;

/* Length of the current page literals.  */
int mvs_page_lit;

/* Current function name.  */
char *mvs_function_name = 0;

/* Current function name length.  */
int mvs_function_name_length = 0;

/* Page number for multi-page functions.  */
int mvs_page_num = 0;

/* Label node list anchor.  */
static label_node_t *label_anchor = 0;

/* Label node free list anchor.  */
static label_node_t *free_anchor = 0;

/* Assembler source file descriptor.  */
static FILE *assembler_source = 0;

/* Define the length of the internal MVS function table.  */
#define MVS_FUNCTION_TABLE_LENGTH 32

/* C/370 internal function table.  These functions use non-standard linkage
   and must handled in a special manner.  */
static char *mvs_function_table[MVS_FUNCTION_TABLE_LENGTH] =
{
   "ceil",     "edc_acos", "edc_asin", "edc_ata2", "edc_atan", "edc_cos",
   "edc_cosh", "edc_erf",  "edc_erfc", "edc_exp",  "edc_gamm", "edc_lg10",
   "edc_log",  "edc_sin",  "edc_sinh", "edc_sqrt", "edc_tan",  "edc_tanh",
   "fabs",     "floor",    "fmod",     "frexp",    "hypot",    "j0",
   "j1",       "jn",       "ldexp",    "modf",     "pow",      "y0",
   "y1",       "yn"
};

/* ASCII to EBCDIC conversion table.  */
#if defined(TARGET_EBCDIC) && !defined(HOST_EBCDIC)
static unsigned char ascebc[256] =
{
 /*00  NL    SH    SX    EX    ET    NQ    AK    BL */
     0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F,
 /*08  BS    HT    LF    VT    FF    CR    SO    SI */
     0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
 /*10  DL    D1    D2    D3    D4    NK    SN    EB */
     0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26,
 /*18  CN    EM    SB    EC    FS    GS    RS    US */
     0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
 /*20  SP     !     "     #     $     %     &     ' */
     0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D,
 /*28   (     )     *     +     ,     -    .      / */
     0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
 /*30   0     1     2     3     4     5     6     7 */
     0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
 /*38   8     9     :     ;     <     =     >     ? */
     0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
 /*40   @     A     B     C     D     E     F     G */
     0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
 /*48   H     I     J     K     L     M     N     O */
     0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
 /*50   P     Q     R     S     T     U     V     W */
     0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6,
 /*58   X     Y     Z     [     \     ]     ^     _ */
     0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
 /*60   `     a     b     c     d     e     f     g */
     0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
 /*68   h     i     j     k     l     m     n     o */
     0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
 /*70   p     q     r     s     t     u     v     w */
     0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6,
 /*78   x     y     z     {     |     }     ~    DL */
     0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
     0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0xFF
};
#endif

/* EBCDIC to ASCII conversion table.  */
#if defined(HOST_EBCDIC) && !defined(TARGET_EBCDIC)
unsigned char ebcasc[256] =
{
 /*00  NU    SH    SX    EX    PF    HT    LC    DL */
     0x00, 0x01, 0x02, 0x03, 0x00, 0x09, 0x00, 0x7F,
 /*08              SM    VT    FF    CR    SO    SI */
     0x00, 0x00, 0x00, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
 /*10  DE    D1    D2    TM    RS    NL    BS    IL */
     0x10, 0x11, 0x12, 0x13, 0x14, 0x0A, 0x08, 0x00,
 /*18  CN    EM    CC    C1    FS    GS    RS    US */
     0x18, 0x19, 0x00, 0x00, 0x1C, 0x1D, 0x1E, 0x1F,
 /*20  DS    SS    FS          BP    LF    EB    EC */
     0x00, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x17, 0x1B,
 /*28              SM    C2    EQ    AK    BL       */
     0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07, 0x00,
 /*30              SY          PN    RS    UC    ET */
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04,
 /*38                    C3    D4    NK          SU */
     0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x00, 0x1A,
 /*40  SP                                           */
     0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*48                     .     <     (     +     | */
     0x00, 0x00, 0x00, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
 /*50   &                                           */
     0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*58               !     $     *     )     ;     ^ */
     0x00, 0x00, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E,
 /*60   -     /                                     */
     0x2D, 0x2F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*68                     ,     %     _     >     ? */
     0x00, 0x00, 0x00, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
 /*70                                               */
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*78         `     :     #     @     '     =     " */
     0x00, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
 /*80         a     b     c     d     e     f     g */
     0x00, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
 /*88   h     i           {                         */
     0x68, 0x69, 0x00, 0x7B, 0x00, 0x00, 0x00, 0x00,
 /*90         j     k     l     m     n     o     p */
     0x00, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70,
 /*98   q     r           }                         */
     0x71, 0x72, 0x00, 0x7D, 0x00, 0x00, 0x00, 0x00,
 /*A0         ~     s     t     u     v     w     x */
     0x00, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
 /*A8   y     z                       [             */
     0x79, 0x7A, 0x00, 0x00, 0x00, 0x5B, 0x00, 0x00,
 /*B0                                               */
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*B8                                 ]             */
     0x00, 0x00, 0x00, 0x00, 0x00, 0x5D, 0x00, 0x00,
 /*C0   {     A     B     C     D     E     F     G */
     0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
 /*C8   H     I                                     */
     0x48, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*D0   }     J     K     L     M     N     O     P */
     0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
 /*D8   Q     R                                     */
     0x51, 0x52, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*E0   \           S     T     U     V     W     X */
     0x5C, 0x00, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
 /*E8   Y     Z                                     */
     0x59, 0x5A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /*F0   0     1     2     3     4     5     6     7 */
     0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
 /*F8   8     9                                     */
     0x38, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF
};
#endif

/* Map characters from one character set to another.
   C is the character to be translated.  */

char
mvs_map_char (c)
     char c;
{
#if defined(TARGET_EBCDIC) && !defined(HOST_EBCDIC)
  return ascebc[c];
#else
#if defined(HOST_EBCDIC) && !defined(TARGET_EBCDIC)
  return ebcasc[c];
#else
  return c;
#endif
#endif
}

/* Emit reload of base register if indicated.  This is to eliminate multiple
   reloads when several labels are generated pointing to the same place
   in the code.  */

int
check_label_emit (void)
{
  if (mvs_label_emitted)
    {
      mvs_label_emitted = 0;
      mvs_page_code += 4;
      fprintf (assembler_source, "\tL\t%d,%d(,%d)\n",
	  BASE_REGISTER, (mvs_page_num - function_base_page) * 4,
	  PAGE_REGISTER);
    }
}

/* Add the label to the current page label list.  If a free element is available
   it will be used for the new label.  Otherwise, a label element will be
   allocated from memory.
   ID is the label number of the label being added to the list.  */

int
mvs_add_label (id)
     int id;
{
  label_node_t *lp;

  if (free_anchor)
    {
      lp = free_anchor;
      free_anchor = lp->label_next;
    }
  else
    {
      lp = (label_node_t *) malloc (sizeof (label_node_t));
      if (lp == 0)
	{
	  fatal ("virtual memory exhausted\n");
	  abort ();
	}
    }
  lp->label_id = id;
  lp->label_page = mvs_page_num;
  lp->label_next = label_anchor;
  label_anchor = lp;
}

/* Check to see if the label is in the list.  If 1 is returned then a load