mirror of
https://github.com/netwide-assembler/nasm.git
synced 2025-07-24 10:25:42 -04:00
37d88e4125
1e30 is a floating-point constant, but 1e30h is not. The scanner won't know that until it sees the "h", so make sure we keep enough state to be able to distinguish "1e30" (a possible hex constant) from "1.e30", "1e+30" or "1.0" (unabiguously floating-point.)
229 lines
7.3 KiB
C
229 lines
7.3 KiB
C
#include "compiler.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <inttypes.h>
|
|
|
|
#include "nasm.h"
|
|
#include "nasmlib.h"
|
|
#include "stdscan.h"
|
|
#include "insns.h"
|
|
|
|
/*
|
|
* Standard scanner routine used by parser.c and some output
|
|
* formats. It keeps a succession of temporary-storage strings in
|
|
* stdscan_tempstorage, which can be cleared using stdscan_reset.
|
|
*/
|
|
static char **stdscan_tempstorage = NULL;
|
|
static int stdscan_tempsize = 0, stdscan_templen = 0;
|
|
#define STDSCAN_TEMP_DELTA 256
|
|
|
|
static void stdscan_pop(void)
|
|
{
|
|
nasm_free(stdscan_tempstorage[--stdscan_templen]);
|
|
}
|
|
|
|
void stdscan_reset(void)
|
|
{
|
|
while (stdscan_templen > 0)
|
|
stdscan_pop();
|
|
}
|
|
|
|
/*
|
|
* Unimportant cleanup is done to avoid confusing people who are trying
|
|
* to debug real memory leaks
|
|
*/
|
|
void stdscan_cleanup(void)
|
|
{
|
|
stdscan_reset();
|
|
nasm_free(stdscan_tempstorage);
|
|
}
|
|
|
|
static char *stdscan_copy(char *p, int len)
|
|
{
|
|
char *text;
|
|
|
|
text = nasm_malloc(len + 1);
|
|
strncpy(text, p, len);
|
|
text[len] = '\0';
|
|
|
|
if (stdscan_templen >= stdscan_tempsize) {
|
|
stdscan_tempsize += STDSCAN_TEMP_DELTA;
|
|
stdscan_tempstorage = nasm_realloc(stdscan_tempstorage,
|
|
stdscan_tempsize *
|
|
sizeof(char *));
|
|
}
|
|
stdscan_tempstorage[stdscan_templen++] = text;
|
|
|
|
return text;
|
|
}
|
|
|
|
char *stdscan_bufptr = NULL;
|
|
int stdscan(void *private_data, struct tokenval *tv)
|
|
{
|
|
char ourcopy[MAX_KEYWORD + 1], *r, *s;
|
|
|
|
(void)private_data; /* Don't warn that this parameter is unused */
|
|
|
|
while (isspace(*stdscan_bufptr))
|
|
stdscan_bufptr++;
|
|
if (!*stdscan_bufptr)
|
|
return tv->t_type = 0;
|
|
|
|
/* we have a token; either an id, a number or a char */
|
|
if (isidstart(*stdscan_bufptr) ||
|
|
(*stdscan_bufptr == '$' && isidstart(stdscan_bufptr[1]))) {
|
|
/* now we've got an identifier */
|
|
bool is_sym = false;
|
|
|
|
if (*stdscan_bufptr == '$') {
|
|
is_sym = true;
|
|
stdscan_bufptr++;
|
|
}
|
|
|
|
r = stdscan_bufptr++;
|
|
/* read the entire buffer to advance the buffer pointer but... */
|
|
while (isidchar(*stdscan_bufptr))
|
|
stdscan_bufptr++;
|
|
|
|
/* ... copy only up to IDLEN_MAX-1 characters */
|
|
tv->t_charptr = stdscan_copy(r, stdscan_bufptr - r < IDLEN_MAX ?
|
|
stdscan_bufptr - r : IDLEN_MAX - 1);
|
|
|
|
if (is_sym || stdscan_bufptr - r > MAX_KEYWORD)
|
|
return tv->t_type = TOKEN_ID; /* bypass all other checks */
|
|
|
|
for (s = tv->t_charptr, r = ourcopy; *s; s++)
|
|
*r++ = tolower(*s);
|
|
*r = '\0';
|
|
/* right, so we have an identifier sitting in temp storage. now,
|
|
* is it actually a register or instruction name, or what? */
|
|
return nasm_token_hash(ourcopy, tv);
|
|
} else if (*stdscan_bufptr == '$' && !isnumchar(stdscan_bufptr[1])) {
|
|
/*
|
|
* It's a $ sign with no following hex number; this must
|
|
* mean it's a Here token ($), evaluating to the current
|
|
* assembly location, or a Base token ($$), evaluating to
|
|
* the base of the current segment.
|
|
*/
|
|
stdscan_bufptr++;
|
|
if (*stdscan_bufptr == '$') {
|
|
stdscan_bufptr++;
|
|
return tv->t_type = TOKEN_BASE;
|
|
}
|
|
return tv->t_type = TOKEN_HERE;
|
|
} else if (isnumstart(*stdscan_bufptr)) { /* now we've got a number */
|
|
bool rn_error;
|
|
bool is_hex = false;
|
|
bool is_float = false;
|
|
bool has_e = false;
|
|
bool has_h = false;
|
|
char c;
|
|
|
|
r = stdscan_bufptr++;
|
|
|
|
if (r[0] == '$' || (r[0] == '0' || (r[1] == 'x' || r[1] == 'X')))
|
|
is_hex = true;
|
|
|
|
for (;;) {
|
|
c = *stdscan_bufptr++;
|
|
|
|
if (!is_hex && (c == 'e' || c == 'E')) {
|
|
has_e = true;
|
|
if (*stdscan_bufptr == '+' || *stdscan_bufptr == '-') {
|
|
/* e can only be followed by +/- if it is either a
|
|
prefixed hex number or a floating-point number */
|
|
is_float = true;
|
|
stdscan_bufptr++;
|
|
}
|
|
} else if (c == 'H' || c == 'h') {
|
|
has_h = true;
|
|
} else if (c == 'P' || c == 'p') {
|
|
is_float = true;
|
|
if (*stdscan_bufptr == '+' || *stdscan_bufptr == '-')
|
|
stdscan_bufptr++;
|
|
} else if (isnumchar(c) || c == '_')
|
|
; /* just advance */
|
|
else if (c == '.')
|
|
is_float = true;
|
|
else
|
|
break;
|
|
}
|
|
stdscan_bufptr--; /* Point to first character beyond number */
|
|
|
|
if (has_e && !has_h) {
|
|
/* 1e13 is floating-point, but 1e13h is not */
|
|
is_float = true;
|
|
}
|
|
|
|
if (is_float) {
|
|
tv->t_charptr = stdscan_copy(r, stdscan_bufptr - r);
|
|
return tv->t_type = TOKEN_FLOAT;
|
|
} else {
|
|
r = stdscan_copy(r, stdscan_bufptr - r);
|
|
tv->t_integer = readnum(r, &rn_error);
|
|
stdscan_pop();
|
|
if (rn_error)
|
|
return tv->t_type = TOKEN_ERRNUM; /* some malformation occurred */
|
|
tv->t_charptr = NULL;
|
|
return tv->t_type = TOKEN_NUM;
|
|
}
|
|
} else if (*stdscan_bufptr == '\'' || *stdscan_bufptr == '"') {
|
|
/* a char constant */
|
|
char quote = *stdscan_bufptr++, *r;
|
|
bool rn_warn;
|
|
r = tv->t_charptr = stdscan_bufptr;
|
|
while (*stdscan_bufptr && *stdscan_bufptr != quote)
|
|
stdscan_bufptr++;
|
|
tv->t_inttwo = stdscan_bufptr - r; /* store full version */
|
|
if (!*stdscan_bufptr)
|
|
return tv->t_type = TOKEN_ERRNUM; /* unmatched quotes */
|
|
stdscan_bufptr++; /* skip over final quote */
|
|
tv->t_integer = readstrnum(r, tv->t_inttwo, &rn_warn);
|
|
/* FIXME: rn_warn is not checked! */
|
|
return tv->t_type = TOKEN_NUM;
|
|
} else if (*stdscan_bufptr == ';') { /* a comment has happened - stay */
|
|
return tv->t_type = 0;
|
|
} else if (stdscan_bufptr[0] == '>' && stdscan_bufptr[1] == '>') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_SHR;
|
|
} else if (stdscan_bufptr[0] == '<' && stdscan_bufptr[1] == '<') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_SHL;
|
|
} else if (stdscan_bufptr[0] == '/' && stdscan_bufptr[1] == '/') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_SDIV;
|
|
} else if (stdscan_bufptr[0] == '%' && stdscan_bufptr[1] == '%') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_SMOD;
|
|
} else if (stdscan_bufptr[0] == '=' && stdscan_bufptr[1] == '=') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_EQ;
|
|
} else if (stdscan_bufptr[0] == '<' && stdscan_bufptr[1] == '>') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_NE;
|
|
} else if (stdscan_bufptr[0] == '!' && stdscan_bufptr[1] == '=') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_NE;
|
|
} else if (stdscan_bufptr[0] == '<' && stdscan_bufptr[1] == '=') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_LE;
|
|
} else if (stdscan_bufptr[0] == '>' && stdscan_bufptr[1] == '=') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_GE;
|
|
} else if (stdscan_bufptr[0] == '&' && stdscan_bufptr[1] == '&') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_DBL_AND;
|
|
} else if (stdscan_bufptr[0] == '^' && stdscan_bufptr[1] == '^') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_DBL_XOR;
|
|
} else if (stdscan_bufptr[0] == '|' && stdscan_bufptr[1] == '|') {
|
|
stdscan_bufptr += 2;
|
|
return tv->t_type = TOKEN_DBL_OR;
|
|
} else /* just an ordinary char */
|
|
return tv->t_type = (uint8_t)(*stdscan_bufptr++);
|
|
}
|
|
|