/* opc2c.c --- generate C opcode decoder code from from .opc file
Copyright (C) 2005-2018 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.
This file is part of the GNU opcode library.
This program 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 of the License, or
(at your option) any later version.
This program 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, see <http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>
#include "libiberty.h"
static char * line_buf = NULL;
static int line_buf_size = 0;
#define LBUFINCR 100
char *
safe_fgets (FILE * f)
{
char * line_ptr;
if (line_buf == NULL)
{
line_buf = (char *) malloc (LBUFINCR);
line_buf_size = LBUFINCR;
}
/* Points to last byte. */
line_ptr = line_buf + line_buf_size - 1;
/* So we can see if fgets put a 0 there. */
*line_ptr = 1;
if (fgets (line_buf, line_buf_size, f) == 0)
return NULL;
/* We filled the buffer? */
while (line_ptr[0] == 0 && line_ptr[-1] != '\n')
{
/* Make the buffer bigger and read more of the line. */
line_buf_size += LBUFINCR;
line_buf = (char *) realloc (line_buf, line_buf_size);
/* Points to last byte again. */
line_ptr = line_buf + line_buf_size - 1;
/* So we can see if fgets put a 0 there. */
*line_ptr = 1;
if (fgets (line_buf + line_buf_size - LBUFINCR - 1, LBUFINCR + 1, f) == 0)
return NULL;
}
return line_buf;
}
static int errors = 0;
#define MAX_BYTES 10
typedef struct
{
int varyno:16;
int byte:8;
int shift:8;
} VaryRef;
typedef struct
{
char nbytes;
char dbytes;
char id[MAX_BYTES * 8 + 1];
unsigned char var_start[MAX_BYTES * 8 + 1];
struct
{
unsigned char decodable_mask;
unsigned char decodable_bits;
} b[MAX_BYTES];
char * comment;
char * syntax;
int lineno;
int nlines;
char ** lines;
struct Indirect * last_ind;
int semantics_label;
int nvaries;
VaryRef * vary;
} opcode;
int n_opcodes;
opcode ** opcodes;
opcode * op;
typedef struct
{
char * name;
int nlen;
unsigned char mask;
int n_patterns;
unsigned char * patterns;
} Vary;
Vary ** vary = 0;
int n_varies = 0;
unsigned char cur_bits[MAX_BYTES + 1];
const char * orig_filename;
FILE * sim_log = NULL;
#define lprintf if (sim_log) fprintf
opcode prefix_text, suffix_text;
typedef enum
{
T_unused,
T_op,
T_indirect,
T_done
} OpType;
typedef struct Indirect
{
OpType type;
union
{
struct Indirect * ind;
opcode * op;
} u;
} Indirect;
Indirect indirect[256];
static int
next_varybits (int bits, opcode * op, int byte)
{
int mask = op->b[byte].decodable_mask;
int i;
for (i = 0; i < 8; i++)
if (!(mask & (1 << i)))
{
if (bits & (1 << i))
{
bits &= ~(1 << i);
}
else
{
bits |= (1 << i);
return bits;
}
}
return 0;
}
static int
valid_varybits (int bits, opcode * op, int byte)
{
if (op->nvaries)
{
int vn;
for (vn = 0; vn < op->nvaries; vn++)
{
Vary * v;
int found = 0;
int i;
int ob;
if (byte != op->vary[vn].byte)
continue;
v = vary[op->vary[vn].varyno];
ob = (bits >> op->vary[vn].shift) & v->mask;
lprintf (sim_log, "varybits: vary %s ob %x\n", v->name, ob);
for (i = 0; i < v->n_patterns; i++)
if (ob == v->patterns[i])
{
lprintf (sim_log, " found at %d\n", i);
found = 1;
break;
}
if (!found)
return 0;
}
}
return 1;
}
char *
prmb (int mask, int bits)
{
static char buf[8][30];
static int bn = 0;
char * bp;
bn = (bn + 1) % 8;
bp = buf[bn];
int i;
for (i = 0; i < 8; i++)
{
int bit = 0x80 >> i;
if (!(mask & bit))
*bp++ = '-';
else if (bits & bit)
*bp++ = '1';
else
*bp++ = '0';
if (i % 4 == 3)
*bp++ = ' ';
}
*--bp = 0;
return buf[bn];
}
static int
op_cmp (const void *va, const void *vb)
{
const opcode * a = *(const opcode **) va;
const opcode * b = *(const opcode **) vb;
if (a->nbytes != b->nbytes)
return a->nbytes - b->nbytes;
return strcmp (a->id, b->id);
}
void
dump_lines (opcode * op, int level, Indirect * ind)
{
char * varnames[40];
int i, vn = 0;
if (op->semantics_label)
{
printf ("%*sgoto op_semantics_%d;\n", level, "", op->semantics_label);
return;
}
if (ind != op->last_ind)
{
static int labelno = 0;
labelno++;
printf ("%*sop_semantics_%d:\n", level, "", labelno);
op->semantics_label = labelno;
}
if (op->comment)
{
level += 2;
printf ("%*s{\n", level, "");
printf ("%*s %s\n", level, "", op->comment);
}
for (i = 0; i < op->nbytes * 8;)
{
if (isalpha (op->id[i]))
{
int byte = i >> 3;
int mask = 0;
int shift = 0;
char name[33];
char * np = name;
while (op->id[i] && isalpha (op->id[i]))
{
mask = (mask << 1) | 1;
shift = 7 - (i & 7);
*np++ = op->id[i++];
if (op->var_start[i])
break;
}
*np = 0;
varnames[vn++] = strdup (name);
printf ("#line %d \"%s\"\n", op->lineno + 1, orig_filename);
if (mask & ~0xff)
{
fprintf (stderr, "Error: variable %s spans bytes: %s\n",
name, op->comment);
errors++;
}
else if (shift && (mask != 0xff))
printf ("%*s int %s AU = (op[%d] >> %d) & 0x%02x;\n",
level, "", name, byte, shift, mask);
else if (mask != 0xff)
printf ("%*s int %s AU = op[%d] & 0x%02x;\n",
level, "", name, byte, mask);
else
printf ("%*s int %s AU = op[%d];\n", level, "", name, byte);
}
else
i++;
}
if (op->comment)
{
printf ("%*s if (trace)\n", level, "");
printf ("%*s {\n", level, "");
printf ("%*s printf (\"\\033[33m%%s\\033[0m ", level, "");
for (i = 0; i < op->nbytes; i++)
printf (" %%02x");
printf ("\\n\"");
printf (",\n%*s \"%s\"", level, "", op->comment);
for (i = 0; i < op->nbytes; i++)
{
if (i == 0)
printf (",\n%*s op[%d]", level, "", i);
else
printf (", op[%d]", i);
}
printf (");\n");
for (i = 0; i < vn; i++)
printf ("%*s printf (\" %s = 0x%%x%s\", %s);\n", level, "",
varnames[i], (i < vn - 1) ? "," : "\\n", varnames[i]);
printf ("%*s }\n", level, "");
}
if (op->syntax)
printf ("%*s SYNTAX(\"%s\");\n", level, "", op->syntax);
printf ("#line %d \"%s\"\n", op->lineno + 1, orig_filename);
for (i = 0; i < op->nlines; i++)
if (op->lines[i][0] == '\n')
printf ("%s", op->lines[i]);
else
printf ("%*s%s", level, "", op->lines[i]);
if (op->comment)
printf ("%*s}\n", level, "");
}
void
store_opcode_bits (opcode * op, int byte, Indirect * ind)
{
int bits = op->b[byte].decodable_bits;
do
{
if (!valid_varybits (bits, op, byte))
continue;
switch (ind[bits].type)
{
case T_unused:
if (byte == op->dbytes - 1)
{
ind[bits].type = T_op;
ind[bits].u.op = op;
op->last_ind = ind;
break;
}
else
{
int i2;
ind[bits].type = T_indirect;
ind[bits].u.ind = (Indirect *) malloc (256 * sizeof (Indirect));
for (i2 = 0; i2 < 256; i2++)
ind[bits].u.ind[i2].type = T_unused;
store_opcode_bits (op, byte + 1, ind[bits].u.ind);
}
break;
case T_indirect:
if (byte < op->dbytes - 1)
store_opcode_bits (op, byte + 1, ind[bits].u.ind);
break;
case T_op:
break;
case T_done:
break;
}
}
while ((bits = next_varybits (bits, op, byte)) != 0);
}
void
emit_indirect (Indirect * ind, int byte)
{
int unsup = 0;
int j, n, mask;
mask = 0;
for (j = 0; j < 256; j++)
{
switch (ind[j].type)
{
case T_indirect:
mask = 0xff;
break;
case T_op:
mask |= ind[j].u.op->b[byte].decodable_mask;
break;
case T_done:
case T_unused:
break;
}
}
printf ("%*s GETBYTE ();\n", byte * 6, "");
printf ("%*s switch (op[%d] & 0x%02x)\n", byte * 6, "", byte, mask);
printf ("%*s {\n", byte * 6, "");
for (j = 0; j < 256; j++)
if ((j & ~mask) == 0)
{
switch (ind[j].type)
{
case T_done:
break;
case T_unused:
unsup = 1;
break;
case T_op:
for (n = j; n < 256; n++)
if ((n & ~mask) == 0
&& ind[n].type == T_op && ind[n].u.op == ind[j].u.op)
{
ind[n].type = T_done;
printf ("%*s case 0x%02x:\n", byte * 6, "", n);
}
for (n = byte; n < ind[j].u.op->nbytes - 1; n++)
printf ("%*s GETBYTE();\n", byte * 6, "");
dump_lines (ind[j].u.op, byte * 6 + 6, ind);
printf ("%*s break;\n", byte * 6, "");
break;
case T_indirect:
printf ("%*s case 0x%02x:\n", byte * 6, "", j);
emit_indirect (ind[j].u.ind, byte + 1);
printf ("%*s break;\n", byte * 6, "");
break;
}
}
if (unsup)
printf ("%*s default: UNSUPPORTED(); break;\n", byte * 6, "");
printf ("%*s }\n", byte * 6, "");
}
static char *
pv_dup (char * p, char * ep)
{
int n = ep - p;
char *rv = (char *) malloc (n + 1);
memcpy (rv, p, n);
rv[n] = 0;
return rv;
}
static unsigned char
str2mask (char * str, char * ep)
{
unsigned char rv = 0;
while (str < ep)
{
rv *= 2;
if (*str == '1')
rv += 1;
str++;
}
return rv;
}
static void
process_vary (char * line)
{
char * cp;
char * ep;
Vary * v = (Vary *) malloc (sizeof (Vary));
n_varies++;
if (vary)
vary = (Vary **) realloc (vary, n_varies * sizeof (Vary *));
else
vary = (Vary **) malloc (n_varies * sizeof (Vary *));
vary[n_varies - 1] = v;
cp = line;
for (cp = line; isspace (*cp); cp++);
for (ep = cp; *ep && !isspace (*ep); ep++);
v->name = pv_dup (cp, ep);
v->nlen = strlen (v->name);
v->mask = (1 << v->nlen) - 1;
v->n_patterns = 0;
v->patterns = (unsigned char *) malloc (1);
while (1)
{
for (cp = ep; isspace (*cp); cp++);
if (!isdigit (*cp))
break;
for (ep = cp; *ep && !isspace (*ep); ep++);
v->n_patterns++;
v->patterns = (unsigned char *) realloc (v->patterns, v->n_patterns);
v->patterns[v->n_patterns - 1] = str2mask (cp, ep);
}
}
static int
fieldcmp (opcode * op, int bit, char *name)
{
int n = strlen (name);
if (memcmp (op->id + bit, name, n) == 0
&& (!isalpha (op->id[bit + n]) || op->var_start[bit + n]))
return 1;
return 0;
}
static void
log_indirect (Indirect * ind, int byte)
{
int i, j;
char * last_c = 0;
for (i = 0; i < 256; i++)
{
for (j = 0; j < byte; j++)
fprintf (sim_log, "%s ", prmb (255, cur_bits[j]));
fprintf (sim_log, "%s ", prmb (255, i));
switch (ind[i].type)
{
case T_op:
case T_done:
if (last_c && (ind[i].u.op->comment == last_c))
fprintf (sim_log, "''\n");
else
fprintf (sim_log, "%s\n", ind[i].u.op->comment);
last_c = ind[i].u.op->comment;
break;
case T_unused:
fprintf (sim_log, "unused\n");
break;
case T_indirect:
fprintf (sim_log, "indirect\n");
cur_bits[byte] = i;
log_indirect (ind[i].u.ind, byte + 1);
last_c = 0;
break;
}
}
}
int
main (int argc, char ** argv)
{
char * line;
FILE * in;
int lineno = 0;
int i;
VaryRef * vlist;
int skipping_section = 0;
if (argc > 2 && strcmp (argv[1], "-l") == 0)
{
sim_log = fopen (argv[2], "w");
fprintf (stderr, "sim_log: %s\n", argv[2]);
argc -= 2;
argv += 2;
}
if (argc < 2)
{
fprintf (stderr, "usage: opc2c infile.opc > outfile.opc\n");
exit (1);
}
orig_filename = lbasename (argv[1]);
in = fopen (argv[1], "r");
if (!in)
{
fprintf (stderr, "Unable to open file %s for reading: %s\n", argv[1],
xstrerror (errno));
exit (1);
}
n_opcodes = 0;
opcodes = (opcode **) malloc (sizeof (opcode *));
op = &prefix_text;
op->lineno = 0;
while ((line = safe_fgets (in)) != 0)
{
lineno++;
if (strncmp (line, "/*?* ", 5) == 0)
{
skipping_section = 1;
continue;
}
if (strncmp (line, " /** ", 6) == 0
&& (isdigit (line[6]) || memcmp (line + 6, "VARY", 4) == 0))
line += 2;
if (line[0] == '/' && line[1] == '*' && line[2] == '*')
{
skipping_section = 0;
if (strncmp (line, "/** */", 6) == 0)
{
op = &suffix_text;
op->lineno = lineno;
}
else if (strncmp (line, "/** VARY ", 9) == 0)
process_vary (line + 9);
else
{
char * lp;
int i, bit, byte;
int var_start = 1;
n_opcodes++;
opcodes =
(opcode **) realloc (opcodes, n_opcodes * sizeof (opcode *));
op = (opcode *) malloc (sizeof (opcode));
opcodes[n_opcodes - 1] = op;
op->nbytes = op->dbytes = 0;
memset (op->id, 0, sizeof (op->id));
memset (op->var_start, 0, sizeof (op->var_start));
for (i = 0; i < MAX_BYTES; i++)
{
op->b[i].decodable_mask = 0;
op->b[i].decodable_bits = 0;
}
op->comment = strdup (line);
op->comment[strlen (op->comment) - 1] = 0;
while (op->comment[0] && isspace (op->comment[0]))
op->comment++;
op->lineno = lineno;
op->nlines = 0;
op->lines = 0;
op->last_ind = 0;
op->semantics_label = 0;
op->nvaries = 0;
op->vary = 0;
i = 0;
for (lp = line + 4; *lp; lp++)
{
bit = 7 - (i & 7);
byte = i >> 3;
if (strncmp (lp, "*/", 2) == 0)
break;
else if ((lp[0] == ' ' && lp[1] == ' ') || (lp[0] == '\t'))
{
while (*lp == ' ' || *lp == '\t')
lp ++;
op->syntax = strdup (lp);
lp = strstr (op->syntax, "*/");
if (lp)
{
*lp-- = 0;
while ((*lp == ' ' || *lp == '\t')
&& lp > op->syntax)
*lp-- = 0;
}
break;
}
else if (*lp == ' ')
var_start = 1;
else
{
if (*lp == '0' || *lp == '1')
{
op->b[byte].decodable_mask |= 1 << bit;
var_start = 1;
if (op->dbytes < byte + 1)
op->dbytes = byte + 1;
}
else if (var_start)
{
op->var_start[i] = 1;
var_start = 0;
if (op->dbytes < byte + 1)
op->dbytes = byte + 1;
}
if (*lp == '1')
op->b[byte].decodable_bits |= 1 << bit;
op->nbytes = byte + 1;
op->id[i++] = *lp;
}
}
}
}
else if (!skipping_section)
{
op->nlines++;
if (op->lines)
op->lines =
(char **) realloc (op->lines, op->nlines * sizeof (char *));
else
op->lines = (char **) malloc (op->nlines * sizeof (char *));
op->lines[op->nlines - 1] = strdup (line);
}
}
{
int i, j;
for (i = 0; i < n_varies; i++)
{
Vary *v = vary[i];
lprintf (sim_log, "V[%s] %d\n", v->name, v->nlen);
for (j = 0; j < v->n_patterns; j++)
lprintf (sim_log, " P %02x\n", v->patterns[j]);
}
}
for (i = n_opcodes - 2; i >= 0; i--)
{
if (opcodes[i]->nlines == 0)
{
opcodes[i]->nlines = opcodes[i + 1]->nlines;
opcodes[i]->lines = opcodes[i + 1]->lines;
}
}
for (i = 0; i < 256; i++)
indirect[i].type = T_unused;
qsort (opcodes, n_opcodes, sizeof (opcodes[0]), op_cmp);
vlist = (VaryRef *) malloc (n_varies * sizeof (VaryRef));
for (i = 0; i < n_opcodes; i++)
{
int j, b, v;
for (j = 0; j < opcodes[i]->nbytes; j++)
lprintf (sim_log, "%s ",
prmb (opcodes[i]->b[j].decodable_mask,
opcodes[i]->b[j].decodable_bits));
lprintf (sim_log, " %s\n", opcodes[i]->comment);
for (j = 0; j < opcodes[i]->nbytes; j++)
{
for (b = 0; b < 8; b++)
if (isalpha (opcodes[i]->id[j * 8 + b]))
for (v = 0; v < n_varies; v++)
if (fieldcmp (opcodes[i], j * 8 + b, vary[v]->name))
{
int nv = opcodes[i]->nvaries++;
if (nv)
opcodes[i]->vary =
(VaryRef *) realloc (opcodes[i]->vary,
(nv + 1) * sizeof (VaryRef));
else
opcodes[i]->vary =
(VaryRef *) malloc ((nv + 1) * sizeof (VaryRef));
opcodes[i]->vary[nv].varyno = v;
opcodes[i]->vary[nv].byte = j;
opcodes[i]->vary[nv].shift = 8 - b - vary[v]->nlen;
lprintf (sim_log, "[vary %s shift %d]\n",
vary[v]->name, opcodes[i]->vary[nv].shift);
}
}
}
for (i = 0; i < n_opcodes; i++)
{
int i2;
int bytes = opcodes[i]->dbytes;
lprintf (sim_log, "\nmask:");
for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_mask);
lprintf (sim_log, "%*s%s\n", 13 - 3 * opcodes[i]->nbytes, "",
opcodes[i]->comment);
lprintf (sim_log, "bits:");
for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_bits);
lprintf (sim_log, "%*s(%s) %d byte%s\n", 13 - 3 * opcodes[i]->nbytes,
"", opcodes[i]->id, bytes, bytes == 1 ? "" : "s");
store_opcode_bits (opcodes[i], 0, indirect);
}
dump_lines (&prefix_text, 0, 0);
emit_indirect (indirect, 0);
dump_lines (&suffix_text, 0, 0);
if (sim_log)
log_indirect (indirect, 0);
return errors;
}