Finishing touches on perfect hash tokenizer; actually turn the thing on

Finish the perfect hash tokenizer, and actually enable it.

Move stdscan() et al to a separate file, since it's not needed in any
of the clients of nasmlib other than nasm itself.

Run make alldeps.

1 files changed, 201 insertions, 0 deletions

diff --git a/stdscan.c b/stdscan.c
new file mode 100644
index 0000000..4a5f296
--- /dev/null
+++ b/stdscan.c
@@ -0,0 +1,201 @@
+#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 == '$' && isidstart(stdscan_bufptr[1]))) {
+        /* now we've got an identifier */
+        uint32_t i;
+        int is_sym = FALSE;
+
+        if (*stdscan_bufptr == '$') {
+            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? */
+	if (nasm_token_hash(ourcopy, tv) != -1)
+	    return tv->t_type;
+	else
+	    return tv->t_type = TOKEN_ID;
+    } 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 */
+        int rn_error;
+
+        r = stdscan_bufptr++;
+        while (isnumchar(*stdscan_bufptr))
+            stdscan_bufptr++;
+
+        if (*stdscan_bufptr == '.') {
+            /*
+             * a floating point constant
+             */
+            stdscan_bufptr++;
+            while (isnumchar(*stdscan_bufptr) ||
+                   ((stdscan_bufptr[-1] == 'e'
+                     || stdscan_bufptr[-1] == 'E')
+                    && (*stdscan_bufptr == '-' || *stdscan_bufptr == '+'))) {
+                stdscan_bufptr++;
+            }
+            tv->t_charptr = stdscan_copy(r, stdscan_bufptr - r);
+            return tv->t_type = TOKEN_FLOAT;
+        }
+        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;
+        int 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++);
+}
+