5590 improper use of NULL in tools/protocmp

[unleashed.git] / usr / src / tools / stabs / stabs.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1996-2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I%     %E% SMI"

#include <limits.h>
#include <stdarg.h>
#include <stdio.h>

#include "stabs.h"

static struct tdesc *hash_table[BUCKETS];
static struct tdesc *name_table[BUCKETS];

static void reset(void);
static jmp_buf  resetbuf;

static char *get_line(void);
static void parseline(char *cp);
static char *soudef(char *cp, enum type type, struct tdesc **rtdp);
static void enumdef(char *cp, struct tdesc **rtdp);
static int compute_sum(char *w);
static struct tdesc *lookup(int h);

static char *number(char *cp, int *n);
static char *name(char *cp, char **w);
static char *id(char *cp, int *h);
static char *offsize(char *cp, struct mlist *mlp);
static char *whitesp(char *cp);
static void addhash(struct tdesc *tdp, int num);
static void tagadd(char *w, int h, struct tdesc *tdp);
static void tagdecl(char *cp, struct tdesc **rtdp, int h, char *w);
static char *tdefdecl(char *cp, int h, struct tdesc **rtdp);
static char *intrinsic(char *cp, struct tdesc **rtdp);
static char *arraydef(char *cp, struct tdesc **rtdp);

static int line_number = 0;
static int debug_line  = 0;
static char linebuf[MAXLINE];

extern int debug_level;

static void
debug(int level, char *cp, char *fmt, ...)
{
        va_list ap;
        char buf[1024];
        char tmp[32];
        int i;

        if (level > debug_level)
                return;

        if (cp != NULL) {
                for (i = 0; i < 30; i++) {
                        if (cp[i] == '\0')
                                break;
                        if (!iscntrl(cp[i]))
                                tmp[i] = cp[i];
                }
                tmp[i] = '\0';
                (void) sprintf(buf, "%s [cp='%s']\n", fmt, tmp);
        } else {
                strcpy(buf, fmt);
                strcat(buf, "\n");
        }

        va_start(ap, fmt);
        (void) vfprintf(stderr, buf, ap);
        va_end(ap);
}


/* Report unexpected syntax in stabs. */
static void
expected(
        char *who,      /* what function, or part thereof, is reporting */
        char *what,     /* what was expected */
        char *where)    /* where we were in the line of input */
{
        fprintf(stderr, "%s, input line %d: expecting \"%s\" at \"%s\"\n",
                who, line_number, what, where);
        exit(1);
}

/* Read a line from stdin into linebuf and increment line_number. */
static char *
get_line(void)
{
        char *cp = fgets(linebuf, MAXLINE, stdin);
        line_number++;

        /* For debugging, you can set debug_line to a line to stop on. */
        if (line_number == debug_line) {
                fprintf(stderr, "Hit debug line number %d\n", line_number);
                for (;;)
                        sleep(1);
        }
        return (cp);
}

/* Get the continuation of the current input line. */
static char *
get_continuation(void)
{
        char *cp = get_line();
        if (!cp) {
                fprintf(stderr, "expecting continuation line, "
                    "got end of input\n");
                exit(1);
        }

        /* Skip to the quoted stuff. */
        while (*cp++ != '"')
                ;
        return (cp);
}

void
parse_input(void)
{
        char *cp;
        int i = 0;

        for (i = 0; i < BUCKETS; i++) {
                hash_table[i] = NULL;
                name_table[i] = NULL;
        }

        /*
         * get a line at a time from the .s stabs file and parse.
         */
        while ((cp = get_line()) != NULL)
                parseline(cp);
}

/*
 * Parse each line of the .s file (stabs entry) gather meaningful information
 * like name of type, size, offsets of fields etc.
 */
static void
parseline(char *cp)
{
        struct tdesc *tdp;
        char c, *w;
        int h, tagdef;

        /*
         * setup for reset()
         */
        if (setjmp(resetbuf))
                return;

        /*
         * Look for lines of the form
         *      .stabs  "str",n,n,n,n
         * The part in '"' is then parsed.
         */
        cp = whitesp(cp);
#define STLEN   6
        debug(2, cp, "parseline");
        if (strncmp(cp, ".stabs", STLEN) != 0)
                reset();
        cp += STLEN;
#undef STLEN
        cp = whitesp(cp);
        if (*cp++ != '"')
                reset();

        /*
         * name:type            variable (ignored)
         * name:ttype           typedef
         * name:Ttype           struct tag define
         */
        cp = whitesp(cp);
        cp = name(cp, &w);

        tagdef = 0;
        switch (c = *cp++) {
        case 't': /* type */
                break;
        case 'T': /* struct, union, enum */
                tagdef = 1;
                break;
        default:
                reset();
        }

        /*
         * The type id and definition follow.
         */
        cp = id(cp, &h);
        if (*cp == '"') {
                struct tdesc *ntdp;

                cp++;
                ntdp = lookup(h);
                if (ntdp == NULL) {  /* if that type isn't defined yet */
                        if (*cp++ != '=')  /* better be defining it now */
                                expected("parseline/'0-9'", "=", cp - 1);
                        cp = tdefdecl(cp, h, &tdp);
                        addhash(tdp, h); /* for *(x,y) types */
                } else { /* that type is already defined */
                        tdp = malloc(sizeof (*tdp));
                        tdp->type = TYPEOF;
                        tdp->name = (w != NULL) ? strdup(w) : NULL;
                        tdp->data.tdesc = ntdp;
                        addhash(tdp, h); /* for *(x,y) types */
                        debug(3, NULL, "    %s defined as %s(%d)", w,
                            (ntdp->name != NULL) ? ntdp->name : "anon", h);
                }
                return;
        } else if (*cp++ != '=') {
                expected("parseline", "=", cp - 1);
        }
        if (tagdef) {
                tagdecl(cp, &tdp, h, w);
        } else {
                tdefdecl(cp, h, &tdp);
                tagadd(w, h, tdp);
        }
}

/*
 * Check if we have this node in the hash table already
 */
static struct tdesc *
lookup(int h)
{
        int hash = HASH(h);
        struct tdesc *tdp = hash_table[hash];

        while (tdp != NULL) {
                if (tdp->id == h)
                        return (tdp);
                tdp = tdp->hash;
        }
        return (NULL);
}

static char *
whitesp(char *cp)
{
        char *orig, c;

        orig = cp;
        for (c = *cp++; isspace(c); c = *cp++)
                ;
        --cp;
        return (cp);
}

static char *
name(char *cp, char **w)
{
        char *new, *orig, c;
        int len;

        orig = cp;
        c = *cp++;
        if (c == ':')
                *w = NULL;
        else if (isalpha(c) || c == '_') {
                for (c = *cp++; isalnum(c) || c == ' ' || c == '_'; c = *cp++)
                        ;
                if (c != ':')
                        reset();
                len = cp - orig;
                new = malloc(len);
                while (orig < cp - 1)
                        *new++ = *orig++;
                *new = '\0';
                *w = new - (len - 1);
        } else
                reset();

        return (cp);
}

static char *
number(char *cp, int *n)
{
        char *next;

        *n = (int)strtol(cp, &next, 10);
        if (next == cp)
                expected("number", "<number>", cp);
        return (next);
}

static char *
id(char *cp, int *h)
{
        int n1, n2;

        if (*cp == '(') {       /* SunPro style */
                cp++;
                cp = number(cp, &n1);
                if (*cp++ != ',')
                        expected("id", ",", cp - 1);
                cp = number(cp, &n2);
                if (*cp++ != ')')
                        expected("id", ")", cp - 1);
                *h = n1 * 1000 + n2;
        } else if (isdigit(*cp)) { /* gcc style */
                cp = number(cp, &n1);
                *h = n1;
        } else {
                expected("id", "(/0-9", cp);
        }
        return (cp);
}

static void
tagadd(char *w, int h, struct tdesc *tdp)
{
        struct tdesc *otdp;

        tdp->name = w;
        if (!(otdp = lookup(h)))
                addhash(tdp, h);
        else if (otdp != tdp) {
                fprintf(stderr, "duplicate entry\n");
                fprintf(stderr, "old: %s %d %d %d\n",
                    otdp->name ? otdp->name : "NULL",
                    otdp->type, otdp->id / 1000, otdp->id % 1000);
                fprintf(stderr, "new: %s %d %d %d\n",
                    tdp->name ? tdp->name : "NULL",
                    tdp->type, tdp->id / 1000, tdp->id % 1000);
        }
}

static void
tagdecl(char *cp, struct tdesc **rtdp, int h, char *w)
{
        debug(1, NULL, "tagdecl: declaring '%s'", w ? w : "(anon)");
        if ((*rtdp = lookup(h)) != NULL) {
                if (w != NULL) {
                        if ((*rtdp)->name != NULL &&
                            strcmp((*rtdp)->name, w) != 0) {
                                struct tdesc *tdp;

                                tdp = malloc(sizeof (*tdp));
                                tdp->name = strdup(w);
                                tdp->type = TYPEOF;
                                tdp->data.tdesc = *rtdp;
                                addhash(tdp, h); /* for *(x,y) types */
                                debug(3, NULL, "    %s defined as %s(%d)", w,
                                    ((*rtdp)->name != NULL) ?
                                    (*rtdp)->name : "anon", h);
                        } else if ((*rtdp)->name == NULL) {
                                (*rtdp)->name = w;
                                addhash(*rtdp, h);
                        }
                }
        } else {
                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->name = w;
                addhash(*rtdp, h);
        }

        switch (*cp++) {
        case 's':
                soudef(cp, STRUCT, rtdp);
                break;
        case 'u':
                soudef(cp, UNION, rtdp);
                break;
        case 'e':
                enumdef(cp, rtdp);
                break;
        default:
                expected("tagdecl", "<tag type s/u/e>", cp - 1);
                break;
        }
}

static char *
tdefdecl(char *cp, int h, struct tdesc **rtdp)
{
        struct tdesc *ntdp;
        char *w;
        int c, h2;
        char type;

        debug(3, cp, "tdefdecl h=%d", h);

        /* Type codes */
        switch (type = *cp) {
        case 'b': /* integer */
                c = *++cp;
                if (c != 's' && c != 'u')
                        expected("tdefdecl/b", "[su]", cp - 1);
                c = *++cp;
                if (c == 'c')
                        cp++;
                cp = intrinsic(cp, rtdp);
                break;
        case 'R': /* fp */
                /* skip up to and past ';' */
                while (*cp++ != ';')
                        /* NULL */;
                cp = intrinsic(cp, rtdp);
                break;
        case '(': /* equiv to another type */
                cp = id(cp, &h2);
                ntdp = lookup(h2);
                if (ntdp == NULL) {  /* if that type isn't defined yet */
                        if (*cp++ != '=')  /* better be defining it now */
                                expected("tdefdecl/'('", "=", cp - 1);
                        cp = tdefdecl(cp, h2, rtdp);
                        ntdp = malloc(sizeof (*ntdp));
                        ntdp->type = TYPEOF;
                        ntdp->data.tdesc = *rtdp;
                        addhash(ntdp, h2);
                } else { /* that type is already defined */
                        *rtdp = malloc(sizeof (**rtdp));
                        (*rtdp)->type = TYPEOF;
                        (*rtdp)->data.tdesc = ntdp;
                }
                break;
        case '*':
                ntdp = NULL;
                cp = tdefdecl(cp + 1, h, &ntdp);
                if (ntdp == NULL)
                        expected("tdefdecl/*", "id", cp);

                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->type = POINTER;
                (*rtdp)->size = model->pointersize;
                (*rtdp)->name = "pointer";
                (*rtdp)->data.tdesc = ntdp;
                break;
        case 'f':
                cp = tdefdecl(cp + 1, h, &ntdp);
                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->type = FUNCTION;
                (*rtdp)->size = model->pointersize;
                (*rtdp)->name = "function";
                (*rtdp)->data.tdesc = ntdp;
                break;
        case 'a':
                cp++;
                if (*cp++ != 'r')
                        expected("tdefdecl/a", "r", cp - 1);
                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->type = ARRAY;
                (*rtdp)->name = "array";
                cp = arraydef(cp, rtdp);
                break;
        case 'x':
                c = *++cp;
                if (c != 's' && c != 'u' && c != 'e')
                        expected("tdefdecl/x", "[sue]", cp - 1);
                cp = name(cp + 1, &w);
                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->type = FORWARD;
                (*rtdp)->name = w;
                break;
        case 'B': /* volatile */
                cp = tdefdecl(cp + 1, h, &ntdp);
                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->type = VOLATILE;
                (*rtdp)->size = 0;
                (*rtdp)->name = "volatile";
                (*rtdp)->data.tdesc = ntdp;
                break;
        case 'k': /* const */
                cp = tdefdecl(cp + 1, h, &ntdp);
                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->type = CONST;
                (*rtdp)->size = 0;
                (*rtdp)->name = "const";
                (*rtdp)->data.tdesc = ntdp;
                break;
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
                /* gcc equiv to another type */
                cp = id(cp, &h2);
                ntdp = lookup(h2);
                if (ntdp == NULL) {  /* if that type isn't defined yet */
                        /* better be defining it now */
                        if (*cp++ != '=') {
                                if (h != h2)
                                        expected("tdefdecl/'0-9'", "=", cp - 1);
                                /* defined in terms of itself */
                                *rtdp = malloc(sizeof (**rtdp));
                                (*rtdp)->type = INTRINSIC;
                                (*rtdp)->name = "void";
                                (*rtdp)->size = 0;
                        } else {
                                cp = tdefdecl(cp, h2, rtdp);
                                ntdp = malloc(sizeof (*ntdp));
                                ntdp->type = TYPEOF;
                                ntdp->data.tdesc = *rtdp;
                                addhash(ntdp, h2);
                        }
                } else { /* that type is already defined */
                        *rtdp = malloc(sizeof (**rtdp));
                        (*rtdp)->type = TYPEOF;
                        (*rtdp)->data.tdesc = ntdp;
                }
                break;
        case 'u':
        case 's':
                cp++;

                *rtdp = malloc(sizeof (**rtdp));
                (*rtdp)->name = NULL;
                cp = soudef(cp, (type == 'u') ? UNION : STRUCT, rtdp);
                break;
        default:
                expected("tdefdecl", "<type code>", cp);
        }
        return (cp);
}

static char *
intrinsic(char *cp, struct tdesc **rtdp)
{
        struct tdesc *tdp;
        int size;

        cp = number(cp, &size);
        tdp = malloc(sizeof (*tdp));
        tdp->type = INTRINSIC;
        tdp->size = size;
        tdp->name = NULL;
        debug(3, NULL, "intrinsic: size=%ld", size);
        *rtdp = tdp;
        return (cp);
}

static char *
soudef(char *cp, enum type type, struct tdesc **rtdp)
{
        struct mlist **next_pp, *prev_p = NULL;
        char *w;
        int size;
        struct tdesc *tdp;

        cp = number(cp, &size);
        (*rtdp)->size = size;
        (*rtdp)->type = type; /* s or u */

        /*
         * An '@' here indicates a bitmask follows.   This is so the
         * compiler can pass information to debuggers about how structures
         * are passed in the v9 world.  We don't need this information
         * so we skip over it.
         */
        if (cp[0] == '@')
                cp += 3;

        debug(3, cp, "soudef: %s size=%d",
            (*rtdp)->name ? (*rtdp)->name : "(anonsou)",
            (*rtdp)->size);

        next_pp = &((*rtdp)->data.members.forw); /* head for forward linklist */
        /* fill up the fields */
        while ((*cp != '"') && (*cp != ';')) { /* signifies end of fields */
                int h;
                struct mlist *mlp = malloc(sizeof (*mlp));

                mlp->prev = prev_p;     /* links for the backward list */
                prev_p = mlp;
                *next_pp = mlp;         /* links for the forward list */
                next_pp = &mlp->next;

                cp = name(cp, &w);
                mlp->name = w;
                cp = id(cp, &h);
                /*
                 * find the tdesc struct in the hash table for this type
                 * and stick a ptr in here
                 */
                tdp = lookup(h);
                if (tdp == NULL) { /* not in hash list */
                        debug(3, NULL, "      defines %s (%d)", w, h);
                        if (*cp++ != '=')
                                expected("soudef", "=", cp - 1);
                        cp = tdefdecl(cp, h, &tdp);
                        addhash(tdp, h);
                        debug(4, cp, "     soudef now looking at    ");
                        cp++;

                } else {
                        debug(3, NULL, "      refers to %s (%d, %s)",
                            w ? w : "anon", h, tdp->name ? tdp->name : "anon");
                }

                mlp->fdesc = tdp;
                cp = offsize(cp, mlp);  /* cp is now pointing to next field */
                if (*cp == '\\')        /* could be a continuation */
                        cp = get_continuation();
        }
        (*rtdp)->data.members.back = prev_p;    /* head for backward linklist */
        return (cp);
}

static char *
offsize(char *cp, struct mlist *mlp)
{
        int offset, size;

        if (*cp == ',')
                cp++;
        cp = number(cp, &offset);
        if (*cp++ != ',')
                expected("offsize/2", ",", cp - 1);
        cp = number(cp, &size);
        if (*cp++ != ';')
                expected("offsize/3", ";", cp - 1);
        mlp->offset = offset;
        mlp->size = size;
        return (cp);
}

static char *
arraydef(char *cp, struct tdesc **rtdp)
{
        int h;
        int start, end;

        cp = id(cp, &h);
        if (*cp++ != ';')
                expected("arraydef/1", ";", cp - 1);

        (*rtdp)->data.ardef = malloc(sizeof (struct ardef));
        (*rtdp)->data.ardef->indices = malloc(sizeof (struct element));
        (*rtdp)->data.ardef->indices->index_type = lookup(h);

        cp = number(cp, &start); /* lower */
        if (*cp++ != ';')
                expected("arraydef/2", ";", cp - 1);
        cp = number(cp, &end);  /* upper */
        if (*cp++ != ';')
                expected("arraydef/3", ";", cp - 1);
        (*rtdp)->data.ardef->indices->range_start = start;
        (*rtdp)->data.ardef->indices->range_end = end;
#if 0
        if (isdigit(*cp)) {
                cp = number(cp, &contents_type); /* lower */
                tdp = lookup(contents_type);
                if (tdp != NULL) {
                        (*rtdp)->data.ardef->contents = tdp;
                } else {
                        if (*cp != '=')
                                expected("arraydef/4", "=", cp);
                        cp = tdefdecl(cp + 1, h, &tdp);
                        addhash(tdp, h); /* for *(x,y) types */
                        (*rtdp)->data.ardef->contents = tdp;
                }
        } /* else  */
#endif
        cp = tdefdecl(cp, h, &((*rtdp)->data.ardef->contents));
        return (cp);
}

static void
enumdef(char *cp, struct tdesc **rtdp)
{
        struct elist *elp, **prev;
        char *w;

        (*rtdp)->type = ENUM;
        (*rtdp)->data.emem = NULL;

        prev = &((*rtdp)->data.emem);
        while (*cp != ';') {
                elp = malloc(sizeof (*elp));
                elp->next = NULL;
                *prev = elp;
                cp = name(cp, &w);
                elp->name = w;
                cp = number(cp, &elp->number);
                debug(3, NULL, "enum %s: %s=%ld",
                    (*rtdp)->name ? (*rtdp)->name : "(anon enum)",
                    elp->name, elp->number);
                prev = &elp->next;
                if (*cp++ != ',')
                        expected("enumdef", ",", cp - 1);
                if (*cp == '\\')
                        cp = get_continuation();
        }
}

/*
 * Add a node to the hash queues.
 */
static void
addhash(struct tdesc *tdp, int num)
{
        int hash = HASH(num);
        struct tdesc *ttdp;
        char added_num = 0, added_name = 0;

        /*
         * If it already exists in the hash table don't add it again
         * (but still check to see if the name should be hashed).
         */
        ttdp = lookup(num);
        if (ttdp == NULL) {
                tdp->id = num;
                tdp->hash = hash_table[hash];
                hash_table[hash] = tdp;
                added_num = 1;
        }

        if (tdp->name != NULL) {
                ttdp = lookupname(tdp->name);
                if (ttdp == NULL) {
                        hash = compute_sum(tdp->name);
                        tdp->next = name_table[hash];
                        name_table[hash] = tdp;
                        added_name = 1;
                }
        }
        if (!added_num && !added_name) {
                fprintf(stderr, "stabs: broken hash\n");
                exit(1);
        }
}

struct tdesc *
lookupname(char *name)
{
        int hash = compute_sum(name);
        struct tdesc *tdp, *ttdp = NULL;

        for (tdp = name_table[hash]; tdp != NULL; tdp = tdp->next) {
                if (tdp->name != NULL && strcmp(tdp->name, name) == 0) {
                        if (tdp->type == STRUCT || tdp->type == UNION ||
                            tdp->type == ENUM || tdp->type == INTRINSIC)
                                return (tdp);
                        if (tdp->type == TYPEOF)
                                ttdp = tdp;
                }
        }
        return (ttdp);
}

static int
compute_sum(char *w)
{
        char c;
        int sum;

        for (sum = 0; (c = *w) != '\0'; sum += c, w++)
                ;
        return (HASH(sum));
}

static void
reset(void)
{
        longjmp(resetbuf, 1);
        /* NOTREACHED */
}