mirror of
https://github.com/ctm/syn68k.git
synced 2024-12-12 14:30:01 +00:00
511 lines
12 KiB
C
511 lines
12 KiB
C
#include "config.h"
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#include "template.h"
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#include "process.h"
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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static int create_asmdata (const template_t *t, int num_operands);
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static void dump_m68k_cc (char *s, const char *i386_cc);
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static boolean_t
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is_operand_holder (const char *p, int *operand_nump, boolean_t *pc_relative_pp)
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{
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boolean_t retval;
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if (p[0] != '%')
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retval = FALSE;
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else
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{
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boolean_t unused;
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if (!pc_relative_pp)
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pc_relative_pp = &unused;
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*pc_relative_pp = p[1] == 'P';
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if (*pc_relative_pp)
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++p;
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retval = isdigit (p[1]);
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if (retval)
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if (operand_nump)
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*operand_nump = atoi (&p[1]);
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}
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return retval;
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}
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static void
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operand_replace (const char *old_code, char *new_code, int operand_num,
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const char *new_operand, int end_num)
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{
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const char *s;
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char *d;
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for (s = old_code, d = new_code; *s != '\0'; )
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{
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int num;
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boolean_t pc_p;
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if (!is_operand_holder (s, &num, &pc_p) || num != operand_num)
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*d++ = *s++;
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else
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{
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if (pc_p)
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{
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sprintf (d, "code_end_%d+", end_num);
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d+= strlen (d);
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++s; /* to skip over the P */
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}
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strcpy (d, new_operand);
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d += strlen (d);
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for (s++; isdigit (*s); s++)
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;
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}
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}
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*d = '\0';
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}
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int
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process_template (FILE *fp, FILE *header_fp, const template_t *t,
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const char *make, int swapop_p)
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{
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int i, num_operands;
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char cc[128], cmd[1024], buf[2048];
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static char last_code_generated[32767];
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FILE *bits;
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/* Count the operands. */
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num_operands = count_operands (t->code);
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/* Generate the C code for all the operand combinations. It's the
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* same for the case where our operands are swapped, so just reuse
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* the old information if swapop_p is true.
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*/
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if (!swapop_p)
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{
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long size;
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if (create_asmdata (t, num_operands) == FAILURE)
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return 0;
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/* Build the program to analyze it. If the make failed, we fail too. */
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system ("rm -f analyze analyze.o");
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sprintf (cmd, "%s -s analyze > /dev/null", make);
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if (system (cmd) != 0)
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return FAILURE;
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/* Get the output of the analyzing program. */
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sprintf (cmd, "./analyze");
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bits = popen (cmd, "r");
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if (bits == NULL)
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return FAILURE;
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/* Copy everything from our input pipe to our buffer. */
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size = fread (last_code_generated, 1, sizeof last_code_generated, bits);
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assert (size >= 0 && size < sizeof last_code_generated);
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last_code_generated[size] = '\0';
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if (pclose (bits) != 0)
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return FAILURE;
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}
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else
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abort ();
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/* Output the code. */
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sprintf (buf,
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"/* Temporary machine-generated file. Delete me. */\n"
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"\n"
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"#include \"syn68k_private.h\"\n"
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"#include \"native.h\"\n"
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"\n"
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"\n"
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"int\n"
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"%s%s (COMMON_ARGS",
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t->macro_name, swapop_p ? "_swapop" : "");
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fputs (buf, fp);
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/* Output the prototype for this function to the haeder. */
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sprintf (buf, "extern int %s%s (COMMON_ARGS",
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t->macro_name, swapop_p ? "_swapop" : "");
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fputs (buf, header_fp);
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if (swapop_p)
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{
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for (i = num_operands - 1; i >= 0; i--)
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{
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fprintf (fp, ", int32 %s", t->operand_name[i]);
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fprintf (header_fp, ", int32 %s", t->operand_name[i]);
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}
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}
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else /* !swapop_p */
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{
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for (i = 0; i < num_operands; i++)
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{
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assert (t->operand_name[i] != NULL);
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fprintf (fp, ", int32 %s", t->operand_name[i]);
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fprintf (header_fp, ", int32 %s", t->operand_name[i]);
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}
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}
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fputs (");\n", header_fp);
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fputs (")\n"
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"{\n"
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" host_code_t *code;\n",
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fp);
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dump_m68k_cc (cc, t->i386_cc_out);
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if (cc[0] != '-')
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{
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if (!strcmp (cc, "CNVXZ"))
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fprintf (fp, " SPILL_CC_BITS (c, codep, cc_spill_if_changed);\n");
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else
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{
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int b;
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fprintf (fp, " SPILL_CC_BITS (c, codep, cc_spill_if_changed "
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"& (");
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for (b = 0; cc[b] != '\0'; b++)
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fprintf (fp, "%sM68K_CC%c", (b > 0) ? "| " : "", cc[b]);
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fputs ("));\n", fp);
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}
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/* Note which CC bits we just made valid. */
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if (strcmp (cc, "CNVXZ"))
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{
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int b;
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fprintf (fp,
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" {\n"
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" uint8 newly_valid_cc = (cc_to_compute & (");
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for (b = 0; cc[b] != '\0'; b++)
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fprintf (fp, "%sM68K_CC%c", (b > 0) ? "| " : "", cc[b]);
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fputs ("));\n", fp);
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fprintf (fp,
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"\n"
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" c->cached_cc |= newly_valid_cc;\n"
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" c->dirty_cc |= newly_valid_cc;\n"
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" }\n");
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}
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else
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{
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fputs (" c->cached_cc |= cc_to_compute;\n"
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" c->dirty_cc |= cc_to_compute;\n",
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fp);
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}
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}
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fputs (" code = *codep;\n", fp);
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fputs (last_code_generated, fp);
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fputs (" *codep = code;\n"
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" return 0;\n"
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"}\n",
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fp);
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/* Just so I can watch its progress more easily, flush stuff. */
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fflush (fp);
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fflush (header_fp);
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return SUCCESS;
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}
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static void
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dump_m68k_cc (char *d, const char *i386_cc)
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{
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cc_mask_t m68k_cc;
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const char *s;
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m68k_cc = M68K_CC_NONE;
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for (s = i386_cc; *s != '\0'; s++)
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switch (*s)
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{
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case 'c':
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m68k_cc |= (M68K_CCC | M68K_CCX);
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break;
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case 'o':
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m68k_cc |= M68K_CCV;
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break;
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case 's':
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m68k_cc |= M68K_CCN;
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break;
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case 'z':
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m68k_cc |= M68K_CCZ;
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break;
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case 'a':
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case 'p':
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case 'd':
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case 'i':
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break;
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default:
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fprintf (stderr, "Unknown i386 cc bit specifier \"%c\".\n", *s);
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break;
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}
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if (m68k_cc == M68K_CC_NONE)
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*d++ = '-';
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else
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{
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if (m68k_cc & M68K_CCC)
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*d++ = 'C';
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if (m68k_cc & M68K_CCN)
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*d++ = 'N';
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if (m68k_cc & M68K_CCV)
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*d++ = 'V';
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if (m68k_cc & M68K_CCX)
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*d++ = 'X';
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if (m68k_cc & M68K_CCZ)
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*d++ = 'Z';
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}
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*d = '\0';
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}
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int
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count_operands (const char *s)
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{
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int num_operands;
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for (num_operands = 0; ; num_operands++)
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{
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const char *p;
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for (p = s; *p != '\0'; p++)
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{
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int num;
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if (is_operand_holder (p, &num, NULL) && num == num_operands)
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break;
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}
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/* If we failed to find the operand, we're done. */
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if (*p == '\0')
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break;
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}
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return num_operands;
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}
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#define MAX_VALUE_SET_ENTRIES 35
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typedef struct
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{
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int num_values;
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long value[MAX_VALUE_SET_ENTRIES];
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} value_set_t;
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static int
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create_asmdata (const template_t *t, int num_operands)
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{
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static const value_set_t immediate_values[] =
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{ { 12, { 0, 1, 2, -1, -2, 127, -128, -127, 0x37, -100, 0x12, -97 } },
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{ 23, { 0, 1, 2, 0xFF, 0xFE, 127, -129, -128, -127, 128, 0x37,
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-100, 0x12, -97, 32767, -32768, -32767, -1, -2, 0x871,
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-1234, 0x1234, -561 } },
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{ 33, { 0, 1, 2, 0xFF, 0xFE, 128, -129, 127, -128, -127, 0x37, -100,
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0x12, -97,
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32767, -32768, -32767, -1, 0xFFFE, 0x871, 0xFA03,
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0x1234, 0x8765, 0x7FFFFFFF, 0x80000000, 0x80000001,
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0xFFFFFFFF, 0xFFFFFFFE, 0x871529, 0x392332, 0xFA034433,
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0x12345678, 0x87654321 } },
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};
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#if 0
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/* Explanation of this warning:
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* The i386 has slightly more compact opcode sequences in some situations
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* when %al/%ax/%eax is involved in an operation. The register specifier
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* byte is omitted and the register is implicit in the special case opcode.
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* Unfortunately, this can cause:
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* addw $0x1234,%ax ; Using %ax shaves off a byte
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* addw $1,%bx ; small immediate shaves off one byte
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* to both require the same number of compiled bytes. analyze.c isn't
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* yet smart enough to make fine distinctions between two different
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* bit patterns of the same size which don't accept the same operands into
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* the same bit offsets.
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*/
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#warning "Intentionally overlooking compact special cases for %al/%ax/%eax"
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#endif
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static const value_set_t register_values[3] =
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{
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{ 8, { 0, 1, 2, 3, 4, 5, 6, 7 } },
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{ 6, { 0, 1, 2, 3, /* skip %bp,%sp */ 6, 7 } },
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{ 6, { 0, 1, 2, 3, /* skip %ebp,%esp */ 6, 7 } }
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};
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static const char *register_name[3][8] =
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{
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/* We don't consider %esp and %ebp here because they are "escape"
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* registers in some circumstances to indicate different addressing
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* modes, and we don't allocate anything into them anyway.
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* It's best to not confuse our software by allowing escape sequences.
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*/
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{ "%al", "%cl", "%dl", "%bl", "%ah", "%ch", "%dh", "%bh" },
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{ "%ax", "%cx", "%dx", "%bx", NULL, NULL, "%si", "%di" },
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{ "%eax", "%ecx", "%edx", "%ebx", NULL, NULL, "%esi", "%edi" }
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};
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int current, n, op;
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int which[MAX_OPERANDS + 1];
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const value_set_t *value[MAX_OPERANDS];
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boolean_t done_p;
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long v;
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FILE *fp;
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memset (which, 0, sizeof which);
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memset (value, 0xff, sizeof value); /* help us detect uninitialized use */
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fp = fopen ("asmdata.h", "w");
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if (fp == NULL)
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{
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fprintf (stderr, "Unable to open asmdata.c for writing.\n");
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return FAILURE;
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}
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fputs ("/* This file is machine-generated and ephemeral. DO NOT EDIT! */\n"
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"\n"
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"extern void asmdata (void); /* Avoid compiler warnings. */\n"
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"void asmdata ()\n"
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"{\n",
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fp);
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/* Determine which test value sets we will use for each operand. */
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for (n = 0; n < num_operands; n++)
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{
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if (t->operand[n].type == REGISTER)
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value[n] = ®ister_values[t->operand[n].size];
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else
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value[n] = &immediate_values[t->operand[n].size];
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}
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for (current = 0, done_p = FALSE; !done_p; current++)
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{
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char code[2][1024];
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int new_code = 0;
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#if defined(HAVE_SYMBOL_UNDERSCORE)
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const char *symbol_prefix = "_";
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#else
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const char *symbol_prefix = "";
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#endif
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strcpy (&code[new_code][0], t->code);
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for (op = 0; op < num_operands; op++)
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{
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char buf[100];
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v = value[op]->value[which[op]];
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if (t->operand[op].type == REGISTER)
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strcpy (buf, register_name[t->operand[op].size][v]);
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else
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sprintf (buf, "%ld", v);
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operand_replace (code[new_code], code[!new_code], op, buf, current);
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new_code = !new_code;
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}
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/*
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* Use local labels so we get smaller branches even on Mac OS X. The
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* following note comes from the Mac OS X Assembler reference:
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*
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* Note: The Mac OS X assembler for Intel i386 processors always
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* produces branch instructions that are long (32 bits) for non-local
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* labels. This allows the link editor to do procedure ordering (see
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* the description of the -sectorder option in the ld(1) man page).
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*/
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fprintf (fp,
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" asm volatile (\"\\n\"\n"
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" \"%scode_start_%d:\\n\\t\"\n"
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" \"%s\\n\"\n"
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" \"Lcode_end_%d:\\n\"\n"
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" \"%scode_end_%d:\");\n",
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symbol_prefix, current, code[new_code], current,
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symbol_prefix, current);
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/* Try the next combination of operands. */
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for (op = num_operands - 1; op >= 0; op--)
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{
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if (++which[op] >= value[op]->num_values)
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{
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which[op] = 0;
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if (op == 0)
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done_p = TRUE;
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}
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else
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break;
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}
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if (num_operands == 0)
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done_p = TRUE;
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}
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fputs ("}\n", fp);
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fprintf (fp,
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"\n"
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"#define NUM_SAMPLES %d\n"
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"#define NUM_OPERANDS %d\n"
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"#define TEMPLATE template[%d]\n"
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"\n",
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current, num_operands, t - &template[0]);
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fputs ("static const long value[NUM_SAMPLES][NUM_OPERANDS + 1] =\n"
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"{\n",
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fp);
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memset (which, 0, sizeof which);
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for (n = 0; n < current; n++)
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{
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fprintf (fp, " {");
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for (op = 0; op < num_operands; op++)
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fprintf (fp, "%s 0x%lX", op == 0 ? "" : ",",
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(unsigned long) value[op]->value[which[op]]);
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fputs (" },\n", fp);
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/* Try the next combination of operands. */
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for (op = num_operands - 1; op >= 0; op--)
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{
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if (++which[op] >= value[op]->num_values)
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which[op] = 0;
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else
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break;
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}
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}
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fputs ("};\n", fp);
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for (n = 0; n < current; n++)
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{
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fprintf (fp,
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"extern uint8 code_start_%d;\n"
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"extern uint8 code_end_%d;\n",
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n, n);
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}
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fputs ("\n"
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"typedef struct\n"
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"{\n"
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" const uint8 *start, *end;\n"
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"} sample_t;\n"
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"\n",
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fp);
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fputs ("static const sample_t sample[NUM_SAMPLES] =\n"
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"{\n", fp);
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memset (which, 0, sizeof which);
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for (n = 0; n < current; n++)
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{
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fprintf (fp,
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" { &code_start_%d, &code_end_%d }",
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n, n);
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/* Try the next combination of operands. */
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for (op = num_operands - 1; op >= 0; op--)
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{
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if (++which[op] >= value[op]->num_values)
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which[op] = 0;
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else
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break;
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}
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if (n < current - 1)
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fputs (",\n", fp);
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}
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fputs ("};\n", fp);
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fclose (fp);
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return SUCCESS;
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}
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