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process.c
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/******************************************************************************
* @file process.c
*****************************************************************************/
#include <ctype.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "as.h"
#include "frag.h"
#include "hashtab.h"
#include "intel.h"
#include "lex.h"
#include "lib.h"
#include "listing.h"
#include "load_line.h"
#include "macro.h"
#include "pseudo_ops.h"
#include "process.h"
#include "report.h"
#include "section.h"
#include "symbol.h"
#include "vector.h"
static const char *filename = 0;
static unsigned long line_number = 0;
char lex_table[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* SPACE!"#$%&'()*+,-./ */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, /* 0123456789:;<=>? */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 3, /* #PQRSTUVWXYZ[\]^_ */
0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 'abcdefghijklmno */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 0 /* pqrstuvwxyz{|}~ */
};
/**
* Index: a character
*
* Output:
* 1 - the character ends a line
* 2 - the character is a line separator
*
* Line separators allowing having multiple logical lines on a single physical line.
*/
char is_end_of_line[256] = {
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 /* '\0' and '\n' */
};
static char *find_end_of_line (char *line) {
while (!is_end_of_line[(int) *line]) {
++(line);
}
return line;
}
char get_symbol_name_end (char **pp) {
char c = **pp;
if (is_name_beginner ((int) (*pp)[0])) {
while (is_name_part ((int) (*pp)[0])) {
(*pp)++;
}
c = **pp;
**pp = '\0';
}
return c;
}
int read_and_append_char_in_ascii (char **pp, int double_quotes, int size) {
char ch;
int i;
unsigned long number;
switch (ch = *((*pp)++)) {
case '"':
if (double_quotes) {
return 1;
}
for (i = 0; i < size; i++) {
frag_append_1_char ((ch >> (8 * i)) & 0xff);
}
break;
case '\'':
if (!double_quotes) {
return 1;
}
for (i = 0; i < size; i++) {
frag_append_1_char ((ch >> (8 * i)) & 0xff);
}
break;
case '\0':
--*pp; /* Might be the end of line buffer. */
report (REPORT_WARNING, "null character in string; '\"' inserted");
return 1;
case '\n':
report (REPORT_WARNING, "unterminated string; newline inserted");
++line_number;
for (i = 0; i < size; i++) {
frag_append_1_char ((ch >> (8 * i)) & 0xff);
}
break;
case '\\':
ch = *((*pp)++);
switch (ch) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
for (i = 0, number = 0; isdigit (ch) && (i < 3); (ch = *((*pp)++)), i++) {
number = number * 8 + ch - '0';
}
for (i = 0; i < size; i++) {
frag_append_1_char ((number >> (8 * i)) & 0xff);
}
(*pp)--;
break;
case 'r':
number = 13;
for (i = 0; i < size; i++) {
frag_append_1_char ((number >> (8 * i)) & 0xff);
}
break;
case 'n':
number = 10;
for (i = 0; i < size; i++) {
frag_append_1_char ((number >> (8 * i)) & 0xff);
}
break;
case '\\':
case '"':
case '\'':
for (i = 0; i < size; i++) {
frag_append_1_char ((ch >> (8 * i)) & 0xff);
}
break;
default:
report_at (__FILE__, __LINE__, REPORT_INTERNAL_ERROR, "+++UNIMPLEMENTED escape sequence read_and_append_char_in_ascii");
exit (EXIT_FAILURE);
}
break;
default:
for (i = 0; i < size; i++) {
frag_append_1_char ((ch >> (8 * i)) & 0xff);
}
break;
}
return 0;
}
void get_filename_and_line_number (const char **filename_p, unsigned long *line_number_p) {
*filename_p = filename;
*line_number_p = line_number;
}
void ignore_rest_of_line (char **pp) {
*pp = find_end_of_line (*pp);
++*pp;
}
void demand_empty_rest_of_line (char **pp) {
*pp = skip_whitespace (*pp);
if (is_end_of_line[(int) **pp]) {
++(*pp);
} else {
if (isprint ((int) **pp)) {
report (REPORT_ERROR, "junk at the end of line, first unrecognized character is '%c'", **pp);
} else {
report (REPORT_ERROR, "junk at the end of line, first unrecognized character valued 0x%x", **pp);
}
ignore_rest_of_line (pp);
}
}
static struct vector cond_stack = { 0 };
static int enable = 1, satisfy = 0;
#define CF_ENABLE (1 << 0)
#define CF_SATISFY_SHIFT (1 << 0)
#define CF_SATISFY_MASK (3 << CF_SATISFY_SHIFT)
static long cond_value (int enable, int satisfy) {
return (enable ? CF_ENABLE : 0) | (satisfy << CF_SATISFY_SHIFT);
}
static int handler_if (char **pp) {
struct expr expr;
expression_read_into (pp, &expr);
vec_push (&cond_stack, (void *) cond_value (enable, satisfy));
satisfy = (expr.type == EXPR_TYPE_CONSTANT && expr.add_number != 0);
enable = enable && satisfy == 1;
return enable;
}
static int handler_ifdef (char **pp) {
char saved_ch, *temp = *pp;
while (!is_end_of_line[(int) *temp]) {
++(temp);
}
saved_ch = *temp;
*temp = '\0';
vec_push (&cond_stack, (void *) cond_value (enable, satisfy));
satisfy = has_macro (*pp);
enable = enable && satisfy == 1;
*temp = saved_ch;
*pp = find_end_of_line (*pp);
return enable;
}
static int handler_ifndef (char **pp) {
char saved_ch, *temp = *pp;
while (!is_end_of_line[(int) *temp]) {
++(temp);
}
saved_ch = *temp;
*temp = '\0';
vec_push (&cond_stack, (void *) cond_value (enable, satisfy));
satisfy = !has_macro (*pp);
enable = enable && satisfy == 1;
*temp = saved_ch;
*pp = find_end_of_line (*pp);
return enable;
}
static int handler_elif (char **pp) {
int32_t last = cond_stack.length - 1;
int cond = 0;
long flag;
if (last < 0) {
report (REPORT_ERROR, "'elif': no matching if");
ignore_rest_of_line (pp);
return enable;
}
flag = (long) cond_stack.data[last];
if (satisfy == 2) {
report (REPORT_ERROR, "elif after else");
ignore_rest_of_line (pp);
return enable;
}
if (satisfy == 0) {
struct expr expr;
expression_read_into (pp, &expr);
cond = (expr.type == EXPR_TYPE_CONSTANT && expr.add_number != 0);
if (cond) {
satisfy = 1;
}
} else {
ignore_rest_of_line (pp);
}
enable = !enable && cond && ((flag & CF_ENABLE) != 0);
return enable;
}
static int handler_elifdef (char **pp) {
int32_t last = cond_stack.length - 1;
int cond = 0;
long flag;
if (last < 0) {
report (REPORT_ERROR, "'elifdef': no matching if");
ignore_rest_of_line (pp);
return enable;
}
flag = (long) cond_stack.data[last];
if (satisfy == 2) {
report (REPORT_ERROR, "elifdef after else");
ignore_rest_of_line (pp);
return enable;
}
if (satisfy == 0) {
char saved_ch, *temp = *pp;
while (!is_end_of_line[(int) *temp]) {
++(temp);
}
saved_ch = *temp;
*temp = '\0';
cond = has_macro (*pp);
*temp = saved_ch;
*pp = find_end_of_line (*pp);
if (cond) {
satisfy = 1;
}
} else {
ignore_rest_of_line (pp);
}
enable = !enable && cond && ((flag & CF_ENABLE) != 0);
return enable;
}
static int handler_elifndef (char **pp) {
int32_t last = cond_stack.length - 1;
int cond = 0;
long flag;
if (last < 0) {
report (REPORT_ERROR, "'elifndef': no matching if");
ignore_rest_of_line (pp);
return enable;
}
flag = (long) cond_stack.data[last];
if (satisfy == 2) {
report (REPORT_ERROR, "elifndef after else");
ignore_rest_of_line (pp);
return enable;
}
if (satisfy == 0) {
char saved_ch, *temp = *pp;
while (!is_end_of_line[(int) *temp]) {
++(temp);
}
saved_ch = *temp;
*temp = '\0';
cond = !has_macro (*pp);
*temp = saved_ch;
*pp = find_end_of_line (*pp);
if (cond) {
satisfy = 1;
}
} else {
ignore_rest_of_line (pp);
}
enable = !enable && cond && ((flag & CF_ENABLE) != 0);
return enable;
}
static int handler_else (char **pp) {
int32_t last = cond_stack.length - 1;
long flag;
if (last < 0) {
report (REPORT_ERROR, "'else': no matching if");
ignore_rest_of_line (pp);
return enable;
}
flag = (long) cond_stack.data[last];
if (satisfy == 2) {
report (REPORT_ERROR, "else after else");
ignore_rest_of_line (pp);
return enable;
}
enable = !enable && satisfy == 0 && ((flag & CF_ENABLE) != 0);
satisfy = 2;
return enable;
}
static int handler_endif (char **pp) {
int32_t len = cond_stack.length;
long flag;
if (len <= 0) {
report (REPORT_ERROR, "endif used without if");
ignore_rest_of_line (pp);
return enable;
}
flag = (long) cond_stack.data[--len];
enable = (flag & CF_ENABLE) != 0;
satisfy = (flag & CF_SATISFY_MASK) >> CF_SATISFY_SHIFT;
cond_stack.length = len;
return enable;
}
void handler_include (char **pp) {
char *orig_ilp;
const char *orig_filename = filename;
unsigned long orig_ln = line_number;
char *p2 = NULL, *tmp;
unsigned long i, len = 0;
*pp = skip_whitespace (*pp);
tmp = *pp;
if (**pp == '"' || **pp == '\'') {
char ch;
int double_quotes = (**pp == '"');
while ((ch = *++*pp)) {
if (ch == '"' && double_quotes) {
++(*pp);
break;
} else if (ch == '\'') {
++(*pp);
break;
}
len++;
continue;
}
if (double_quotes && ch != '"') {
report (REPORT_ERROR, "unterminated string");
ignore_rest_of_line (pp);
return;
} else if (ch != '\'') {
report (REPORT_ERROR, "unterminated string");
ignore_rest_of_line (pp);
return;
}
} else {
report (REPORT_ERROR, "missing string");
ignore_rest_of_line (pp);
return;
}
p2 = xmalloc (len + 1);
tmp++;
for (i = 0; i < len; i++) {
if (*tmp == '"') {
break;
}
p2[i] = *tmp++;
}
p2[len] = '\0';
demand_empty_rest_of_line (pp);
orig_ilp = *pp;
if (!process_file (p2)) {
*pp = orig_ilp;
goto done;
}
for (i = 0; i < state->nb_inc_paths; i++) {
tmp = xmalloc (strlen (state->inc_paths[i]) + len);
strcpy (tmp, state->inc_paths[i]);
strcat (tmp, p2);
if (!process_file (tmp)) {
free (tmp);
*pp = orig_ilp;
goto done;
}
free (tmp);
}
report_at (orig_filename, orig_ln, REPORT_ERROR, "can't open '%s' for reading", p2);
done:
free (p2);
filename = orig_filename;
line_number = orig_ln;
}
int process_file (const char *fname) {
unsigned long new_line_number = 1;
void *load_line_internal_data = NULL;
unsigned long newlines;
char *line, *line_end;
unsigned long real_line_len;
char *real_line;
int enabled = 1, i;
FILE *ifp;
if ((ifp = fopen (fname, "r")) == NULL) {
return 1;
}
filename = fname;
line_number = 0;
if ((load_line_internal_data = load_line_create_internal_data (&new_line_number)) == NULL) {
return 1;
}
while (!load_line (&line, &line_end, &real_line, &real_line_len, &newlines, ifp, &load_line_internal_data)) {
line_number = new_line_number;
new_line_number += newlines + 1;
if (state->listing) {
update_listing_line (current_frag);
add_listing_line (real_line, real_line_len, filename, line_number);
}
while (line < line_end) {
char saved_ch, *start_p;
line = skip_whitespace (line);
start_p = line;
if (*line == '%') {
++(line);
}
saved_ch = get_symbol_name_end (&line);
if (xstrcasecmp (start_p, "%if") == 0 || xstrcasecmp (start_p, ".if") == 0 || xstrcasecmp (start_p, "if") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_if (&line);
continue;
} else if (xstrcasecmp (start_p, "%ifdef") == 0 || xstrcasecmp (start_p, ".ifdef") == 0 || xstrcasecmp (start_p, "ifdef") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_ifdef (&line);
continue;
} else if (xstrcasecmp (start_p, "%ifndef") == 0 || xstrcasecmp (start_p, ".ifndef") == 0 || xstrcasecmp (start_p, "ifndef") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_ifndef (&line);
continue;
} else if (xstrcasecmp (start_p, "%elif") == 0 || xstrcasecmp (start_p, ".elif") == 0 || xstrcasecmp (start_p, "elif") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_elif (&line);
continue;
} else if (xstrcasecmp (start_p, "%elifdef") == 0 || xstrcasecmp (start_p, ".elifdef") == 0 || xstrcasecmp (start_p, "elifdef") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_elifdef (&line);
continue;
} else if (xstrcasecmp (start_p, "%elifndef") == 0 || xstrcasecmp (start_p, ".elifndef") == 0 || xstrcasecmp (start_p, "elifndef") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_elifndef (&line);
continue;
} else if (xstrcasecmp (start_p, "%else") == 0 || xstrcasecmp (start_p, "else") == 0 || xstrcasecmp (start_p, "else") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_else (&line);
continue;
} else if (xstrcasecmp (start_p, "%endif") == 0 || xstrcasecmp (start_p, ".endif") == 0 || xstrcasecmp (start_p, "endif") == 0) {
*line = saved_ch;
line = skip_whitespace (line);
enabled = handler_endif (&line);
continue;
} else {
*line = saved_ch;
line = start_p;
}
if (!enabled) {
ignore_rest_of_line (&line);
continue;
}
if (*line == '%') {
++(line);
}
saved_ch = get_symbol_name_end (&line);
if (xstrcasecmp (start_p, "extern") == 0 || xstrcasecmp (start_p, "extrn") == 0) {
struct hashtab_name *key;
line = skip_whitespace (line + 1);
start_p = line;
saved_ch = get_symbol_name_end (&line);
if ((key = hashtab_alloc_name (xstrdup (start_p))) == NULL) {
report_at (program_name, 0, REPORT_ERROR, "memory full (malloc)");
goto next;
}
if (hashtab_get (&state->hashtab_externs, key) != NULL) {
free (key);
report_at (program_name, 0, REPORT_ERROR, "hashtab collision");
goto next;
}
hashtab_put (&state->hashtab_externs, key, xstrdup (start_p));
next:
*line = saved_ch;
ignore_rest_of_line (&line);
continue;
} else if (xstrcasecmp (start_p, "assume") == 0 || xstrcasecmp (start_p, "dgroup") == 0 || xstrcasecmp (start_p, ".stack") == 0) {
report (REPORT_WARNING, "%s unimplemented; ignored", start_p);
*line = saved_ch;
ignore_rest_of_line (&line);
continue;
} else if (xstrcasecmp (start_p, "proc") == 0 || xstrcasecmp (start_p, "endp") == 0) {
report (REPORT_ERROR, "procedure must have a name");
*line = saved_ch;
ignore_rest_of_line (&line);
continue;
} else {
*line = saved_ch;
line = start_p;
}
if (is_name_beginner ((int) *line)) {
struct pseudo_op *poe;
if (*line == '%') {
line++;
if (*line == ' ') {
continue;
}
}
saved_ch = get_symbol_name_end (&line);
if (xstrcasecmp (start_p, "equ") == 0) {
report (REPORT_ERROR, "missing label for equ");
*line = saved_ch;
ignore_rest_of_line (&line);
continue;
}
if ((poe = find_pseudo_op (start_p)) != NULL) {
*line = saved_ch;
line = skip_whitespace (line);
(poe->handler) (&line);
continue;
}
if (machine_dependent_is_register (start_p)) {
report (REPORT_ERROR, "label or instruction expected at start of line");
*line = saved_ch;
ignore_rest_of_line (&line);
continue;
}
if (saved_ch && (saved_ch == ':' || (*skip_whitespace (line + 1)) == ':')) {
char temp_ch, *temp_line = line, *temp_start_p;
if (saved_ch != ':') {
temp_line = skip_whitespace (line + 1);
}
temp_line = skip_whitespace (temp_line + 1);
temp_start_p = temp_line;
temp_ch = get_symbol_name_end (&temp_line);
if (xstrcasecmp (temp_start_p, "equ") == 0) {
line = skip_whitespace (temp_line + 1);
handler_equ (&line, start_p);
continue;
}
*temp_line = temp_ch;
symbol_label (start_p);
*line = saved_ch;
if (*line != ':') {
line = skip_whitespace (line + 1) + 1;
}
line = skip_whitespace (line + 1);
continue;
}
if (saved_ch && saved_ch == ' ') {
char temp_ch, *temp_line, *temp_start_p;
temp_line = skip_whitespace (line + 1);
temp_start_p = temp_line;
temp_ch = get_symbol_name_end (&temp_line);
if (is_data_pseudo_op (temp_start_p)) {
symbol_label (start_p);
*temp_line = temp_ch;
line = temp_start_p;
continue;
}
if ((temp_ch && temp_ch == '=') || xstrcasecmp (temp_start_p, "equ") == 0) {
line = skip_whitespace (temp_line + 1);
handler_equ (&line, start_p);
continue;
}
if (xstrcasecmp (temp_start_p, "label") == 0) {
char *temp = xmalloc (13);
symbol_label (start_p);
*temp_line = temp_ch;
line = temp_line;
start_p = (line = skip_whitespace (line));
saved_ch = get_symbol_name_end (&line);
if (xstrcasecmp (start_p, "byte") == 0) {
strcpy (temp, "1 dup (?)");
if ((poe = find_pseudo_op ("db")) != NULL) {
poe->handler (&temp);
}
} else if (xstrcasecmp (start_p, "word") == 0) {
strcpy (temp, "1 dup (?)");
if ((poe = find_pseudo_op ("dw")) != NULL) {
poe->handler (&temp);
}
}
/*ignore_rest_of_line (&line);*/
*line = saved_ch;
continue;
}