/*
 * Copyright (C) 2010 Dan Carpenter.
 *
 * 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 2
 * 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/copyleft/gpl.txt
 */

#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include "smatch.h"
#include "smatch_slist.h"
#include "smatch_extra.h"

struct sqlite3 *smatch_db;
struct sqlite3 *mem_db;
struct sqlite3 *cache_db;

int debug_db;

static int return_id;

static void call_return_state_hooks(struct expression *expr);

#define SQLITE_CACHE_PAGES 1000

struct def_callback {
        int hook_type;
        void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
};
ALLOCATOR(def_callback, "definition db hook callbacks");
DECLARE_PTR_LIST(callback_list, struct def_callback);
static struct callback_list *select_caller_info_callbacks;

struct member_info_callback {
        int owner;
        void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
};
ALLOCATOR(member_info_callback, "caller_info callbacks");
DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
static struct member_info_cb_list *member_callbacks;
static struct member_info_cb_list *member_callbacks_new;

struct returned_state_callback {
        void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
};
ALLOCATOR(returned_state_callback, "returned state callbacks");
DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
static struct returned_state_cb_list *returned_state_callbacks;

struct returned_member_callback {
        int owner;
        void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
};
ALLOCATOR(returned_member_callback, "returned member callbacks");
DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
static struct returned_member_cb_list *returned_member_callbacks;

struct db_implies_callback {
        int type;
        void (*callback)(struct expression *call, struct expression *arg, char *key, char *value);
};
ALLOCATOR(db_implies_callback, "return_implies callbacks");
DECLARE_PTR_LIST(db_implies_cb_list, struct db_implies_callback);
static struct db_implies_cb_list *return_implies_cb_list;
static struct db_implies_cb_list *call_implies_cb_list;

/* silently truncates if needed. */
char *escape_newlines(const char *str)
{
        char buf[1024] = "";
        bool found = false;
        int i, j;

        for (i = 0, j = 0; str[i] != '\0' && j != sizeof(buf); i++, j++) {
                if (str[i] != '\r' && str[i] != '\n') {
                        buf[j] = str[i];
                        continue;
                }

                found = true;
                buf[j++] = '\\';
                if (j == sizeof(buf))
                         break;
                buf[j] = 'n';
        }

        if (!found)
                return alloc_sname(str);

        if (j == sizeof(buf))
                buf[j - 1] = '\0';
        return alloc_sname(buf);
}

static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
{
        int i;

        for (i = 0; i < argc; i++) {
                if (i != 0)
                        sm_printf(", ");
                sm_printf("%s", argv[i]);
        }
        sm_printf("\n");
        return 0;
}

void sql_exec(struct sqlite3 *db, int (*callback)(void*, int, char**, char**), void *data, const char *sql)
{
        char *err = NULL;
        int rc;

        if (!db)
                return;

        if (option_debug || debug_db) {
                sm_msg("%s", sql);
                if (strncasecmp(sql, "select", strlen("select")) == 0)
                        sqlite3_exec(db, sql, print_sql_output, NULL, NULL);
        }

        rc = sqlite3_exec(db, sql, callback, data, &err);
        if (rc != SQLITE_OK && !parse_error) {
                sm_ierror("%s:%d SQL error #2: %s\n", get_filename(), get_lineno(), err);
                sm_ierror("%s:%d SQL: '%s'\n", get_filename(), get_lineno(), sql);
                parse_error = 1;
        }
}

static int replace_count;
static char **replace_table;
static const char *replace_return_ranges(const char *return_ranges)
{
        int i;

        if (!get_function()) {
                /* I have no idea why EXPORT_SYMBOL() is here */
                return return_ranges;
        }
        for (i = 0; i < replace_count; i += 3) {
                if (strcmp(replace_table[i + 0], get_function()) == 0) {
                        if (strcmp(replace_table[i + 1], return_ranges) == 0)
                                return replace_table[i + 2];
                }
        }
        return return_ranges;
}


static char *use_states;
static int get_db_state_count(void)
{
        struct sm_state *sm;
        int count = 0;

        FOR_EACH_SM(__get_cur_stree(), sm) {
                if (sm->owner == USHRT_MAX)
                        continue;
                if (use_states[sm->owner])
                        count++;
        } END_FOR_EACH_SM(sm);
        return count;
}

void db_ignore_states(int id)
{
        use_states[id] = 0;
}

unsigned long long __fn_mtag;
static void set_fn_mtag(struct symbol *sym)
{
        char buf[128];

        if (cur_func_sym->ctype.modifiers & MOD_STATIC)
                snprintf(buf, sizeof(buf), "%s %s", get_base_file(), get_function());
        else
                snprintf(buf, sizeof(buf), "extern %s", get_function());

        __fn_mtag = str_to_mtag(buf);
}

void sql_insert_return_states(int return_id, const char *return_ranges,
                int type, int param, const char *key, const char *value)
{
        unsigned long long id;


        if (key && strlen(key) >= 80)
                return;
        if (__inline_fn)
                id = (unsigned long)__inline_fn;
        else
                id = __fn_mtag;

        return_ranges = replace_return_ranges(return_ranges);
        sql_insert(return_states, "'%s', '%s', %llu, %d, '%s', %d, %d, %d, '%s', '%s'",
                   get_base_file(), get_function(), id, return_id,
                   return_ranges, fn_static(), type, param, key, value);
}

static struct string_list *common_funcs;
static int is_common_function(const char *fn)
{
        char *tmp;

        if (!fn)
                return 0;

        if (strncmp(fn, "__builtin_", 10) == 0)
                return 1;

        FOR_EACH_PTR(common_funcs, tmp) {
                if (strcmp(tmp, fn) == 0)
                        return 1;
        } END_FOR_EACH_PTR(tmp);

        return 0;
}

static char *function_signature(void)
{
        return type_to_str(get_real_base_type(cur_func_sym));
}

void sql_insert_caller_info(struct expression *call, int type,
                int param, const char *key, const char *value)
{
        FILE *tmp_fd = sm_outfd;
        char *fn;

        if (!option_info && !__inline_call)
                return;

        if (key && strlen(key) >= 80)
                return;

        fn = get_fnptr_name(call->fn);
        if (!fn)
                return;

        if (__inline_call) {
                mem_sql(NULL, NULL,
                        "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
                        get_base_file(), get_function(), fn, (unsigned long)call,
                        is_static(call->fn), type, param, key, value);
        }

        if (!option_info)
                return;

        if (strncmp(fn, "__builtin_", 10) == 0)
                return;
        if (type != INTERNAL && is_common_function(fn))
                return;

        sm_outfd = caller_info_fd;
        sm_msg("SQL_caller_info: insert into caller_info values ("
               "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
               get_base_file(), get_function(), fn, is_static(call->fn),
               type, param, key, value);
        sm_outfd = tmp_fd;

        free_string(fn);
}

void sql_insert_function_ptr(const char *fn, const char *struct_name)
{
        sql_insert_or_ignore(function_ptr, "'%s', '%s', '%s', 0",
                             get_base_file(), fn, struct_name);
}

void sql_insert_return_implies(int type, int param, const char *key, const char *value)
{
        sql_insert_or_ignore(return_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'",
                get_base_file(), get_function(), (unsigned long)__inline_fn,
                fn_static(), type, param, key, value);
}

void sql_insert_call_implies(int type, int param, const char *key, const char *value)
{
        sql_insert_or_ignore(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', '%s'",
                get_base_file(), get_function(), (unsigned long)__inline_fn,
                fn_static(), type, param, key, value);
}

void sql_insert_function_type_size(const char *member, const char *ranges)
{
        sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
}

void sql_insert_function_type_info(int type, const char *struct_type, const char *member, const char *value)
{
        sql_insert(function_type_info, "'%s', '%s', %d, '%s', '%s', '%s'", get_base_file(), get_function(), type, struct_type, member, value);
}

void sql_insert_type_info(int type, const char *member, const char *value)
{
        sql_insert_cache(type_info, "'%s', %d, '%s', '%s'", get_base_file(), type, member, value);
}

void sql_insert_local_values(const char *name, const char *value)
{
        sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
}

void sql_insert_function_type_value(const char *type, const char *value)
{
        sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
}

void sql_insert_function_type(int param, const char *value)
{
        sql_insert(function_type, "'%s', '%s', %d, %d, '%s'",
                   get_base_file(), get_function(), fn_static(), param, value);
}

void sql_insert_parameter_name(int param, const char *value)
{
        sql_insert(parameter_name, "'%s', '%s', %d, %d, '%s'",
                   get_base_file(), get_function(), fn_static(), param, value);
}

void sql_insert_data_info(struct expression *data, int type, const char *value)
{
        char *data_name;

        data_name = get_data_info_name(data);
        if (!data_name)
                return;
        sql_insert(data_info, "'%s', '%s', %d, '%s'",
                   is_static(data) ? get_base_file() : "extern",
                   data_name, type, value);
}

void sql_insert_data_info_var_sym(const char *var, struct symbol *sym, int type, const char *value)
{
        sql_insert(data_info, "'%s', '%s', %d, '%s'",
                   (sym->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
                   var, type, value);
}

void sql_save_constraint(const char *con)
{
        if (!option_info)
                return;

        sm_msg("SQL: insert or ignore into constraints (str) values('%s');", escape_newlines(con));
}

void sql_save_constraint_required(const char *data, int op, const char *limit)
{
        sql_insert_or_ignore(constraints_required, "'%s', '%s', '%s'", data, show_special(op), limit);
}

void sql_copy_constraint_required(const char *new_limit, const char *old_limit)
{
        if (!option_info)
                return;

        sm_msg("SQL_late: insert or ignore into constraints_required (data, op, bound) "
                "select constraints_required.data, constraints_required.op, '%s' from "
                "constraints_required where bound = '%s';", new_limit, old_limit);
}

void sql_insert_fn_ptr_data_link(const char *ptr, const char *data)
{
        sql_insert_or_ignore(fn_ptr_data_link, "'%s', '%s'", ptr, data);
}

void sql_insert_fn_data_link(struct expression *fn, int type, int param, const char *key, const char *value)
{
        if (fn->type != EXPR_SYMBOL || !fn->symbol->ident)
                return;

        sql_insert(fn_data_link, "'%s', '%s', %d, %d, %d, '%s', '%s'",
                   (fn->symbol->ctype.modifiers & MOD_STATIC) ? get_base_file() : "extern",
                   fn->symbol->ident->name,
                   !!(fn->symbol->ctype.modifiers & MOD_STATIC),
                   type, param, key, value);
}

void sql_insert_mtag_about(mtag_t tag, const char *left_name, const char *right_name)
{
        sql_insert_cache(mtag_about, "%lld, '%s', '%s', %d, '%s', '%s'",
                         tag, get_filename(), get_function(), get_lineno(),
                         left_name, right_name);
}

void sql_insert_mtag_info(mtag_t tag, int type, const char *value)
{
        sql_insert_cache(mtag_info, "'%s', %lld, %d, '%s'", get_filename(), tag, type, value);
}

void sql_insert_mtag_map(mtag_t container, int container_offset, mtag_t tag, int tag_offset)
{
        sql_insert(mtag_map, "%lld, %d, %lld, %d", container, container_offset, tag, tag_offset);
}

void sql_insert_mtag_alias(mtag_t orig, mtag_t alias)
{
        sql_insert(mtag_alias, "%lld, %lld", orig, alias);
}

static int save_mtag(void *_tag, int argc, char **argv, char **azColName)
{
        mtag_t *saved_tag = _tag;
        mtag_t new_tag;

        new_tag = strtoll(argv[0], NULL, 10);

        if (!*saved_tag)
                *saved_tag = new_tag;
        else if (*saved_tag != new_tag)
                *saved_tag = -1ULL;

        return 0;
}

int mtag_map_select_container(mtag_t tag, int container_offset, mtag_t *container)
{
        mtag_t tmp = 0;

        run_sql(save_mtag, &tmp,
                "select container from mtag_map where tag = %lld and container_offset = %d and tag_offset = 0;",
                tag, container_offset);

        if (tmp == 0 || tmp == -1ULL)
                return 0;
        *container = tmp;
        return 1;
}

int mtag_map_select_tag(mtag_t container, int offset, mtag_t *tag)
{
        mtag_t tmp = 0;

        run_sql(save_mtag, &tmp,
                "select tag from mtag_map where container = %lld and container_offset = %d;",
                container, offset);

        if (tmp == 0 || tmp == -1ULL)
                return 0;
        *tag = tmp;
        return 1;
}

char *get_static_filter(struct symbol *sym)
{
        static char sql_filter[1024];

        /* This can only happen on buggy code.  Return invalid SQL. */
        if (!sym) {
                sql_filter[0] = '\0';
                return sql_filter;
        }

        if (sym->ctype.modifiers & MOD_STATIC) {
                snprintf(sql_filter, sizeof(sql_filter),
                         "file = '%s' and function = '%s' and static = '1'",
                         get_base_file(), sym->ident->name);
        } else {
                snprintf(sql_filter, sizeof(sql_filter),
                         "function = '%s' and static = '0'", sym->ident->name);
        }

        return sql_filter;
}

static int get_row_count(void *_row_count, int argc, char **argv, char **azColName)
{
        int *row_count = _row_count;

        *row_count = 0;
        if (argc != 1)
                return 0;
        *row_count = atoi(argv[0]);
        return 0;
}

static void mark_call_params_untracked(struct expression *call)
{
        struct expression *arg;
        int i = 0;

        FOR_EACH_PTR(call->args, arg) {
                mark_untracked(call, i++, "$", NULL);
        } END_FOR_EACH_PTR(arg);
}

static void sql_select_return_states_pointer(const char *cols,
        struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
{
        char *ptr;
        int return_count = 0;

        ptr = get_fnptr_name(call->fn);
        if (!ptr)
                return;

        run_sql(get_row_count, &return_count,
                "select count(*) from return_states join function_ptr "
                "where return_states.function == function_ptr.function and "
                "ptr = '%s' and searchable = 1 and type = %d;", ptr, INTERNAL);
        /* The magic number 100 is just from testing on the kernel. */
        if (return_count > 100) {
                mark_call_params_untracked(call);
                return;
        }

        run_sql(callback, info,
                "select %s from return_states join function_ptr where "
                "return_states.function == function_ptr.function and ptr = '%s' "
                "and searchable = 1 "
                "order by function_ptr.file, return_states.file, return_id, type;",
                cols, ptr);
}

static int is_local_symbol(struct expression *expr)
{
        if (expr->type != EXPR_SYMBOL)
                return 0;
        if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
                return 0;
        return 1;
}

void sql_select_return_states(const char *cols, struct expression *call,
        int (*callback)(void*, int, char**, char**), void *info)
{
        struct expression *fn;
        int row_count = 0;

        if (is_fake_call(call))
                return;

        fn = strip_expr(call->fn);
        if (fn->type != EXPR_SYMBOL || !fn->symbol || is_local_symbol(fn)) {
                sql_select_return_states_pointer(cols, call, callback, info);
                return;
        }

        if (inlinable(fn)) {
                mem_sql(callback, info,
                        "select %s from return_states where call_id = '%lu' order by return_id, type;",
                        cols, (unsigned long)call);
                return;
        }

        run_sql(get_row_count, &row_count, "select count(*) from return_states where %s;",
                get_static_filter(fn->symbol));
        if (row_count > 3000)
                return;

        run_sql(callback, info, "select %s from return_states where %s order by file, return_id, type;",
                cols, get_static_filter(fn->symbol));
}

#define CALL_IMPLIES 0
#define RETURN_IMPLIES 1

struct implies_info {
        int type;
        struct db_implies_cb_list *cb_list;
        struct expression *expr;
        struct symbol *sym;
};

void sql_select_implies(const char *cols, struct implies_info *info,
        int (*callback)(void*, int, char**, char**))
{
        if (info->type == RETURN_IMPLIES && inlinable(info->expr->fn)) {
                mem_sql(callback, info,
                        "select %s from return_implies where call_id = '%lu';",
                        cols, (unsigned long)info->expr);
                return;
        }

        run_sql(callback, info, "select %s from %s_implies where %s;",
                cols,
                info->type == CALL_IMPLIES ? "call" : "return",
                get_static_filter(info->sym));
}

struct select_caller_info_data {
        struct stree *final_states;
        struct timeval start_time;
        int prev_func_id;
        int ignore;
        int results;
};

static int caller_info_callback(void *_data, int argc, char **argv, char **azColName);

static void sql_select_caller_info(struct select_caller_info_data *data,
        const char *cols, struct symbol *sym)
{
        if (__inline_fn) {
                mem_sql(caller_info_callback, data,
                        "select %s from caller_info where call_id = %lu;",
                        cols, (unsigned long)__inline_fn);
                return;
        }

        if (sym->ident->name && is_common_function(sym->ident->name))
                return;
        run_sql(caller_info_callback, data,
                "select %s from common_caller_info where %s order by call_id;",
                cols, get_static_filter(sym));
        if (data->results)
                return;

        run_sql(caller_info_callback, data,
                "select %s from caller_info where %s order by call_id;",
                cols, get_static_filter(sym));
}

void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
{
        struct def_callback *def_callback = __alloc_def_callback(0);

        def_callback->hook_type = type;
        def_callback->callback = callback;
        add_ptr_list(&select_caller_info_callbacks, def_callback);
}

/*
 * These call backs are used when the --info option is turned on to print struct
 * member information.  For example foo->bar could have a state in
 * smatch_extra.c and also check_user.c.
 */
void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
{
        struct member_info_callback *member_callback = __alloc_member_info_callback(0);

        member_callback->owner = owner;
        member_callback->callback = callback;
        add_ptr_list(&member_callbacks, member_callback);
}

void add_caller_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
{
        struct member_info_callback *member_callback = __alloc_member_info_callback(0);

        member_callback->owner = owner;
        member_callback->callback = callback;
        add_ptr_list(&member_callbacks_new, member_callback);
}

void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
{
        struct returned_state_callback *callback = __alloc_returned_state_callback(0);

        callback->callback = fn;
        add_ptr_list(&returned_state_callbacks, callback);
}

void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state))
{
        struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);

        member_callback->owner = owner;
        member_callback->callback = callback;
        add_ptr_list(&returned_member_callbacks, member_callback);
}

void select_call_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
{
        struct db_implies_callback *cb = __alloc_db_implies_callback(0);

        cb->type = type;
        cb->callback = callback;
        add_ptr_list(&call_implies_cb_list, cb);
}

void select_return_implies_hook(int type, void (*callback)(struct expression *call, struct expression *arg, char *key, char *value))
{
        struct db_implies_callback *cb = __alloc_db_implies_callback(0);

        cb->type = type;
        cb->callback = callback;
        add_ptr_list(&return_implies_cb_list, cb);
}

struct return_info {
        struct expression *static_returns_call;
        struct symbol *return_type;
        struct range_list *return_range_list;
};

static int db_return_callback(void *_ret_info, int argc, char **argv, char **azColName)
{
        struct return_info *ret_info = _ret_info;
        struct range_list *rl;
        struct expression *call_expr = ret_info->static_returns_call;

        if (argc != 1)
                return 0;
        call_results_to_rl(call_expr, ret_info->return_type, argv[0], &rl);
        ret_info->return_range_list = rl_union(ret_info->return_range_list, rl);
        return 0;
}

struct range_list *db_return_vals(struct expression *expr)
{
        struct return_info ret_info = {};
        char buf[64];
        struct sm_state *sm;

        if (is_fake_call(expr))
                return NULL;

        snprintf(buf, sizeof(buf), "return %p", expr);
        sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
        if (sm)
                return clone_rl(estate_rl(sm->state));
        ret_info.static_returns_call = expr;
        ret_info.return_type = get_type(expr);
        if (!ret_info.return_type)
                return NULL;

        if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
                return NULL;

        ret_info.return_range_list = NULL;
        if (inlinable(expr->fn)) {
                mem_sql(db_return_callback, &ret_info,
                        "select distinct return from return_states where call_id = '%lu';",
                        (unsigned long)expr);
        } else {
                run_sql(db_return_callback, &ret_info,
                        "select distinct return from return_states where %s;",
                        get_static_filter(expr->fn->symbol));
        }
        return ret_info.return_range_list;
}

struct range_list *db_return_vals_from_str(const char *fn_name)
{
        struct return_info ret_info;

        ret_info.static_returns_call = NULL;
        ret_info.return_type = &llong_ctype;
        ret_info.return_range_list = NULL;

        run_sql(db_return_callback, &ret_info,
                "select distinct return from return_states where function = '%s';",
                fn_name);
        return ret_info.return_range_list;
}

/*
 * This is used when we have a function that takes a function pointer as a
 * parameter.  "frob(blah, blah, my_function);"  We know that the return values
 * from frob() come from my_funcion() so we want to find the possible returns
 * of my_function(), but we don't know which arguments are passed to it.
 *
 */
struct range_list *db_return_vals_no_args(struct expression *expr)
{
        struct return_info ret_info = {};

        if (!expr || expr->type != EXPR_SYMBOL)
                return NULL;

        ret_info.static_returns_call = expr;
        ret_info.return_type = get_type(expr);
        ret_info.return_type = get_real_base_type(ret_info.return_type);
        if (!ret_info.return_type)
                return NULL;

        run_sql(db_return_callback, &ret_info,
                "select distinct return from return_states where %s;",
                get_static_filter(expr->symbol));

        return ret_info.return_range_list;
}

static void match_call_marker(struct expression *expr)
{
        struct symbol *type;

        type = get_type(expr->fn);
        if (type && type->type == SYM_PTR)
                type = get_real_base_type(type);

        /*
         * we just want to record something in the database so that if we have
         * two calls like:  frob(4); frob(some_unkown); then on the receiving
         * side we know that sometimes frob is called with unknown parameters.
         */

        sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", type_to_str(type));
}

int is_recursive_member(const char *name)
{
        char buf[256];
        const char *p, *next;
        int size;

        p = strchr(name, '>');
        if (!p)
                return 0;
        p++;
        while (true) {
                next = strchr(p, '>');
                if (!next)
                        return 0;
                next++;

                size = next - p;
                if (size >= sizeof(buf))
                        return 0;
                memcpy(buf, p, size);
                buf[size] = '\0';
                if (strstr(next, buf))
                        return 1;
                p = next;
        }
}

char *sm_to_arg_name(struct expression *expr, struct sm_state *sm)
{
        struct symbol *sym;
        const char *sm_name;
        char *name;
        bool is_address = false;
        bool add_star = false;
        char buf[256];
        char *ret = NULL;
        int len;

        expr = strip_expr(expr);
        if (!expr)
                return NULL;

        if (expr->type == EXPR_PREOP && expr->op == '&') {
                expr = strip_expr(expr->unop);
                is_address = true;
        }

        name = expr_to_var_sym(expr, &sym);
        if (!name || !sym)
                goto free;
        if (sym != sm->sym)
                goto free;

        sm_name = sm->name;
        add_star = false;
        if (sm_name[0] == '*') {
                add_star = true;
                sm_name++;
        }

        len = strlen(name);
        if (strncmp(name, sm_name, len) != 0)
                goto free;
        if (sm_name[len] == '\0') {
                snprintf(buf, sizeof(buf), "%s%s$",
                         add_star ? "*" : "", is_address ? "*" : "");
        } else {
                if (sm_name[len] != '.' && sm_name[len] != '-')
                        goto free;
                if (sm_name[len] == '-')
                        len++;
                // FIXME does is_address really imply that sm_name[len] == '-'
                snprintf(buf, sizeof(buf), "%s$->%s", add_star ? "*" : "",
                         sm_name + len);
        }

        ret = alloc_sname(buf);
free:
        free_string(name);
        return ret;
}

static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
        void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm),
        bool new)
{
        struct sm_state *sm;
        const char *sm_name;
        char *name;
        struct symbol *sym;
        int len;
        char printed_name[256];
        int is_address = 0;
        bool add_star;
        struct symbol *type;

        expr = strip_expr(expr);
        if (!expr)
                return;
        type = get_type(expr);
        if (type && type_bits(type) < type_bits(&ulong_ctype))
                return;

        if (expr->type == EXPR_PREOP && expr->op == '&') {
                expr = strip_expr(expr->unop);
                is_address = 1;
        }

        name = expr_to_var_sym(expr, &sym);
        if (!name || !sym)
                goto free;

        len = strlen(name);
        FOR_EACH_SM(stree, sm) {
                if (sm->sym != sym)
                        continue;
                sm_name = sm->name;
                add_star = false;
                if (sm_name[0] == '*') {
                        add_star = true;
                        sm_name++;
                }
                // FIXME: simplify?
                if (!add_star && strcmp(name, sm_name) == 0) {
                        if (is_address) {
                                snprintf(printed_name, sizeof(printed_name), "*$");
                        } else {
                                if (new)
                                        snprintf(printed_name, sizeof(printed_name), "$");
                                else
                                        continue;
                        }
                } else if (add_star && strcmp(name, sm_name) == 0) {
                        snprintf(printed_name, sizeof(printed_name), "%s*$",
                                 is_address ? "*" : "");
                } else if (strncmp(name, sm_name, len) == 0) {
                        if (sm_name[len] != '.' && sm_name[len] != '-')
                                continue;
                        if (is_address && sm_name[len] == '.') {
                                snprintf(printed_name, sizeof(printed_name),
                                         "%s$->%s", add_star ? "*" : "",
                                         sm_name + len + 1);
                        } else if (is_address && sm_name[len] == '-') {
                                snprintf(printed_name, sizeof(printed_name),
                                         "%s(*$)%s", add_star ? "*" : "",
                                         sm_name + len);
                        } else {
                                snprintf(printed_name, sizeof(printed_name),
                                         "%s$%s", add_star ? "*" : "",
                                         sm_name + len);
                        }
                } else {
                        continue;
                }
                if (is_recursive_member(printed_name))
                        continue;
                callback(call, param, printed_name, sm);
        } END_FOR_EACH_SM(sm);
free:
        free_string(name);
}

static void match_call_info(struct expression *call)
{
        struct member_info_callback *cb;
        struct expression *arg;
        struct stree *stree;
        char *name;
        int i;

        name = get_fnptr_name(call->fn);
        if (!name)
                return;

        FOR_EACH_PTR(member_callbacks, cb) {
                stree = get_all_states_stree(cb->owner);
                i = 0;
                FOR_EACH_PTR(call->args, arg) {
                        print_struct_members(call, arg, i, stree, cb->callback, 0);
                        i++;
                } END_FOR_EACH_PTR(arg);
                free_stree(&stree);
        } END_FOR_EACH_PTR(cb);

        free_string(name);
}

static void match_call_info_new(struct expression *call)
{
        struct member_info_callback *cb;
        struct expression *arg;
        struct stree *stree;
        char *name;
        int i;

        name = get_fnptr_name(call->fn);
        if (!name)
                return;

        FOR_EACH_PTR(member_callbacks_new, cb) {
                stree = get_all_states_stree(cb->owner);
                i = 0;
                FOR_EACH_PTR(call->args, arg) {
                        print_struct_members(call, arg, i, stree, cb->callback, 1);
                        i++;
                } END_FOR_EACH_PTR(arg);
                free_stree(&stree);
        } END_FOR_EACH_PTR(cb);

        free_string(name);
}

static int get_param(int param, char **name, struct symbol **sym)
{
        struct symbol *arg;
        int i;

        i = 0;
        FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
                /*
                 * this is a temporary hack to work around a bug (I think in sparse?)
                 * 2.6.37-rc1:fs/reiserfs/journal.o
                 * If there is a function definition without parameter name found
                 * after a function implementation then it causes a crash.
                 * int foo() {}
                 * int bar(char *);
                 */
                if (arg->ident->name < (char *)100)
                        continue;
                if (i == param) {
                        *name = arg->ident->name;
                        *sym = arg;
                        return TRUE;
                }
                i++;
        } END_FOR_EACH_PTR(arg);

        return FALSE;
}

static int function_signature_matches(const char *sig)
{
        char *my_sig;

        my_sig = function_signature();
        if (!sig || !my_sig)
                return 1;  /* default to matching */
        if (strcmp(my_sig, sig) == 0)
                  return 1;
        return 0;
}

static int caller_info_callback(void *_data, int argc, char **argv, char **azColName)
{
        struct select_caller_info_data *data = _data;
        int func_id;
        long type;
        long param;
        char *key;
        char *value;
        char *name = NULL;
        struct symbol *sym = NULL;
        struct def_callback *def_callback;
        struct stree *stree;
        struct timeval cur_time;

        data->results = 1;

        if (argc != 5)
                return 0;

        gettimeofday(&cur_time, NULL);
        if (cur_time.tv_sec - data->start_time.tv_sec > 10)
                return 0;

        func_id = atoi(argv[0]);
        errno = 0;
        type = strtol(argv[1], NULL, 10);
        param = strtol(argv[2], NULL, 10);
        if (errno)
                return 0;
        key = argv[3];
        value = argv[4];

        if (data->prev_func_id == -1)
                data->prev_func_id = func_id;
        if (func_id != data->prev_func_id) {
                stree = __pop_fake_cur_stree();
                if (!data->ignore)
                        merge_stree(&data->final_states, stree);
                free_stree(&stree);
                __push_fake_cur_stree();
                __unnullify_path();
                data->prev_func_id = func_id;
                data->ignore = 0;
        }

        if (data->ignore)
                return 0;
        if (type == INTERNAL &&
            !function_signature_matches(value)) {
                data->ignore = 1;
                return 0;
        }

        if (param >= 0 && !get_param(param, &name, &sym))
                return 0;

        FOR_EACH_PTR(select_caller_info_callbacks, def_callback) {
                if (def_callback->hook_type == type)
                        def_callback->callback(name, sym, key, value);
        } END_FOR_EACH_PTR(def_callback);

        return 0;
}

static struct string_list *ptr_names_done;
static struct string_list *ptr_names;

static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
{
        insert_string(&ptr_names, alloc_string(argv[0]));
        return 0;
}

static char *get_next_ptr_name(void)
{
        char *ptr;

        FOR_EACH_PTR(ptr_names, ptr) {
                if (!insert_string(&ptr_names_done, ptr))
                        continue;
                return ptr;
        } END_FOR_EACH_PTR(ptr);
        return NULL;
}

static void get_ptr_names(const char *file, const char *name)
{
        char sql_filter[1024];
        int before, after;

        if (file) {
                snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
                         file, name);
        } else {
                snprintf(sql_filter, 1024, "function = '%s';", name);
        }

        before = ptr_list_size((struct ptr_list *)ptr_names);

        run_sql(get_ptr_name, NULL,
                "select distinct ptr from function_ptr where %s",
                sql_filter);

        after = ptr_list_size((struct ptr_list *)ptr_names);
        if (before == after)
                return;

        while ((name = get_next_ptr_name()))
                get_ptr_names(NULL, name);
}

static void match_data_from_db(struct symbol *sym)
{
        struct select_caller_info_data data = { .prev_func_id = -1 };
        struct sm_state *sm;
        struct stree *stree;
        struct timeval end_time;

        if (!sym || !sym->ident)
                return;

        set_fn_mtag(sym);
        gettimeofday(&data.start_time, NULL);

        __push_fake_cur_stree();
        __unnullify_path();

        if (!__inline_fn) {
                char *ptr;

                if (sym->ctype.modifiers & MOD_STATIC)
                        get_ptr_names(get_base_file(), sym->ident->name);
                else
                        get_ptr_names(NULL, sym->ident->name);

                if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
                        __free_ptr_list((struct ptr_list **)&ptr_names);
                        __free_ptr_list((struct ptr_list **)&ptr_names_done);
                        __free_fake_cur_stree();
                        return;
                }

                sql_select_caller_info(&data,
                                       "call_id, type, parameter, key, value",
                                       sym);


                stree = __pop_fake_cur_stree();
                if (!data.ignore)
                        merge_stree(&data.final_states, stree);
                free_stree(&stree);
                __push_fake_cur_stree();
                __unnullify_path();
                data.prev_func_id = -1;
                data.ignore = 0;
                data.results = 0;

                FOR_EACH_PTR(ptr_names, ptr) {
                        run_sql(caller_info_callback, &data,
                                "select call_id, type, parameter, key, value"
                                " from common_caller_info where function = '%s' order by call_id",
                                ptr);
                } END_FOR_EACH_PTR(ptr);

                if (data.results) {
                        FOR_EACH_PTR(ptr_names, ptr) {
                                free_string(ptr);
                        } END_FOR_EACH_PTR(ptr);
                        goto free_ptr_names;
                }

                FOR_EACH_PTR(ptr_names, ptr) {
                        run_sql(caller_info_callback, &data,
                                "select call_id, type, parameter, key, value"
                                " from caller_info where function = '%s' order by call_id",
                                ptr);
                        free_string(ptr);
                } END_FOR_EACH_PTR(ptr);

free_ptr_names:
                __free_ptr_list((struct ptr_list **)&ptr_names);
                __free_ptr_list((struct ptr_list **)&ptr_names_done);
        } else {
                sql_select_caller_info(&data,
                                       "call_id, type, parameter, key, value",
                                       sym);
        }

        stree = __pop_fake_cur_stree();
        if (!data.ignore)
                merge_stree(&data.final_states, stree);
        free_stree(&stree);

        gettimeofday(&end_time, NULL);
        if (end_time.tv_sec - data.start_time.tv_sec <= 10) {
                FOR_EACH_SM(data.final_states, sm) {
                        __set_sm(sm);
                } END_FOR_EACH_SM(sm);
        }

        free_stree(&data.final_states);
}

static int return_implies_callbacks(void *_info, int argc, char **argv, char **azColName)
{
        struct implies_info *info = _info;
        struct db_implies_callback *cb;
        struct expression *arg = NULL;
        int type;
        int param;

        if (argc != 5)
                return 0;

        type = atoi(argv[1]);
        param = atoi(argv[2]);

        FOR_EACH_PTR(info->cb_list, cb) {
                if (cb->type != type)
                        continue;
                if (param != -1) {
                        arg = get_argument_from_call_expr(info->expr->args, param);
                        if (!arg)
                                continue;
                }
                cb->callback(info->expr, arg, argv[3], argv[4]);
        } END_FOR_EACH_PTR(cb);

        return 0;
}

static int call_implies_callbacks(void *_info, int argc, char **argv, char **azColName)
{
        struct implies_info *info = _info;
        struct db_implies_callback *cb;
        struct expression *arg;
        struct symbol *sym;
        char *name;
        int type;
        int param;

        if (argc != 5)
                return 0;

        type = atoi(argv[1]);
        param = atoi(argv[2]);

        if (!get_param(param, &name, &sym))
                return 0;
        arg = symbol_expression(sym);
        if (!arg)
                return 0;

        FOR_EACH_PTR(info->cb_list, cb) {
                if (cb->type != type)
                        continue;
                cb->callback(info->expr, arg, argv[3], argv[4]);
        } END_FOR_EACH_PTR(cb);

        return 0;
}

static void match_return_implies(struct expression *expr)
{
        struct implies_info info = {
                .type = RETURN_IMPLIES,
                .cb_list = return_implies_cb_list,
        };

        if (expr->fn->type != EXPR_SYMBOL ||
            !expr->fn->symbol)
                return;
        info.expr = expr;
        info.sym = expr->fn->symbol;
        sql_select_implies("function, type, parameter, key, value", &info,
                           return_implies_callbacks);
}

static void match_call_implies(struct symbol *sym)
{
        struct implies_info info = {
                .type = CALL_IMPLIES,
                .cb_list = call_implies_cb_list,
        };

        if (!sym || !sym->ident)
                return;

        info.sym = sym;
        sql_select_implies("function, type, parameter, key, value", &info,
                           call_implies_callbacks);
}

static char *get_fn_param_str(struct expression *expr)
{
        struct expression *tmp;
        int param;
        char buf[32];

        tmp = get_assigned_expr(expr);
        if (tmp)
                expr = tmp;
        expr = strip_expr(expr);
        if (!expr || expr->type != EXPR_CALL)
                return NULL;
        expr = strip_expr(expr->fn);
        if (!expr || expr->type != EXPR_SYMBOL)
                return NULL;
        param = get_param_num(expr);
        if (param < 0)
                return NULL;

        snprintf(buf, sizeof(buf), "[r $%d]", param);
        return alloc_sname(buf);
}

static char *get_return_compare_is_param(struct expression *expr)
{
        char *var;
        char buf[256];
        int comparison;
        int param;

        param = get_param_num(expr);
        if (param < 0)
                return NULL;

        var = expr_to_var(expr);
        if (!var)
                return NULL;
        snprintf(buf, sizeof(buf), "%s orig", var);
        comparison = get_comparison_strings(var, buf);
        free_string(var);

        if (!comparison)
                return NULL;

        snprintf(buf, sizeof(buf), "[%s$%d]", show_special(comparison), param);
        return alloc_sname(buf);
}

static char *get_return_compare_str(struct expression *expr)
{
        char *compare_str;

        compare_str = get_return_compare_is_param(expr);
        if (compare_str)
                return compare_str;

        compare_str = expr_lte_to_param(expr, -1);
        if (compare_str)
                return compare_str;

        return expr_param_comparison(expr, -1);
}

static const char *get_return_ranges_str(struct expression *expr, struct range_list **rl_p)
{
        struct range_list *rl;
        char *return_ranges;
        sval_t sval;
        char *fn_param_str;
        char *compare_str;
        char *math_str;
        char buf[128];

        *rl_p = NULL;

        if (!expr)
                return alloc_sname("");

        if (get_implied_value(expr, &sval)) {
                sval = sval_cast(cur_func_return_type(), sval);
                *rl_p = alloc_rl(sval, sval);
                return sval_to_str_or_err_ptr(sval);
        }

        fn_param_str = get_fn_param_str(expr);
        compare_str = expr_equal_to_param(expr, -1);
        math_str = get_value_in_terms_of_parameter_math(expr);

        if (get_implied_rl(expr, &rl) && !is_whole_rl(rl)) {
                rl = cast_rl(cur_func_return_type(), rl);
                return_ranges = show_rl(rl);
        } else if (get_imaginary_absolute(expr, &rl)){
                rl = cast_rl(cur_func_return_type(), rl);
                return alloc_sname(show_rl(rl));
        } else {
                get_absolute_rl(expr, &rl);
                rl = cast_rl(cur_func_return_type(), rl);
                return_ranges = show_rl(rl);
        }
        *rl_p = rl;

        if (fn_param_str) {
                snprintf(buf, sizeof(buf), "%s%s", return_ranges, fn_param_str);
                return alloc_sname(buf);
        }
        if (compare_str) {
                snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
                return alloc_sname(buf);
        }
        if (math_str) {
                snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
                return alloc_sname(buf);
        }
        compare_str = get_return_compare_str(expr);
        if (compare_str) {
                snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
                return alloc_sname(buf);
        }

        return return_ranges;
}

static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
{
        sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", function_signature());
}

static bool call_return_state_hooks_conditional(struct expression *expr)
{
        int final_pass_orig = final_pass;
        static int recurse;

        if (recurse >= 2)
                return false;
        if (!expr ||
            (expr->type != EXPR_CONDITIONAL && expr->type != EXPR_SELECT))
                return false;

        recurse++;

        __push_fake_cur_stree();

        final_pass = 0;
        __split_whole_condition(expr->conditional);
        final_pass = final_pass_orig;

        call_return_state_hooks(expr->cond_true ?: expr->conditional);

        __push_true_states();
        __use_false_states();

        call_return_state_hooks(expr->cond_false);

        __merge_true_states();
        __free_fake_cur_stree();

        recurse--;
        return true;
}

static void call_return_state_hooks_compare(struct expression *expr)
{
        struct returned_state_callback *cb;
        char *return_ranges;
        int final_pass_orig = final_pass;
        sval_t sval = { .type = &int_ctype };
        sval_t ret;

        if (!get_implied_value(expr, &ret))
                ret.value = -1;

        __push_fake_cur_stree();

        final_pass = 0;
        __split_whole_condition(expr);
        final_pass = final_pass_orig;

        if (ret.value != 0) {
                return_ranges = alloc_sname("1");
                sval.value = 1;
                set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));

                return_id++;
                FOR_EACH_PTR(returned_state_callbacks, cb) {
                        cb->callback(return_id, return_ranges, expr);
                } END_FOR_EACH_PTR(cb);
        }

        __push_true_states();
        __use_false_states();

        if (ret.value != 1) {
                return_ranges = alloc_sname("0");
                sval.value = 0;
                set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_sval(sval));

                return_id++;
                FOR_EACH_PTR(returned_state_callbacks, cb) {
                        cb->callback(return_id, return_ranges, expr);
                } END_FOR_EACH_PTR(cb);
        }

        __merge_true_states();
        __free_fake_cur_stree();
}

static int ptr_in_list(struct sm_state *sm, struct state_list *slist)
{
        struct sm_state *tmp;

        FOR_EACH_PTR(slist, tmp) {
                if (strcmp(tmp->state->name, sm->state->name) == 0)
                        return 1;
        } END_FOR_EACH_PTR(tmp);

        return 0;
}

static int split_possible_helper(struct sm_state *sm, struct expression *expr)
{
        struct returned_state_callback *cb;
        struct range_list *rl;
        char *return_ranges;
        struct sm_state *tmp;
        int ret = 0;
        int nr_possible, nr_states;
        char *compare_str;
        char buf[128];
        struct state_list *already_handled = NULL;
        sval_t sval;

        if (!sm || !sm->merged)
                return 0;

        if (too_many_possible(sm))
                return 0;

        /* bail if it gets too complicated */
        nr_possible = 0;
        FOR_EACH_PTR(sm->possible, tmp) {
                if (tmp->merged)
                        continue;
                if (ptr_in_list(tmp, already_handled))
                        continue;
                add_ptr_list(&already_handled, tmp);
                nr_possible++;
        } END_FOR_EACH_PTR(tmp);
        free_slist(&already_handled);
        nr_states = get_db_state_count();
        if (nr_states * nr_possible >= 2000)
                return 0;

        FOR_EACH_PTR(sm->possible, tmp) {
                if (tmp->merged)
                        continue;
                if (ptr_in_list(tmp, already_handled))
                        continue;
                add_ptr_list(&already_handled, tmp);

                ret = 1;
                __push_fake_cur_stree();

                overwrite_states_using_pool(sm, tmp);

                rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
                return_ranges = show_rl(rl);
                set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(clone_rl(rl)));
                if (!rl_to_sval(rl, &sval)) {
                        compare_str = get_return_compare_str(expr);
                        if (compare_str) {
                                snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
                                return_ranges = alloc_sname(buf);
                        }
                }

                return_id++;
                FOR_EACH_PTR(returned_state_callbacks, cb) {
                        cb->callback(return_id, return_ranges, expr);
                } END_FOR_EACH_PTR(cb);

                __free_fake_cur_stree();
        } END_FOR_EACH_PTR(tmp);

        free_slist(&already_handled);

        return ret;
}

static int call_return_state_hooks_split_possible(struct expression *expr)
{
        struct sm_state *sm;

        if (!expr)
                return 0;

        sm = get_sm_state_expr(SMATCH_EXTRA, expr);
        return split_possible_helper(sm, expr);
}

static bool has_possible_negative(struct sm_state *sm)
{
        struct sm_state *tmp;

        if (!type_signed(estate_type(sm->state)))
                return false;

        FOR_EACH_PTR(sm->possible, tmp) {
                if (!estate_rl(tmp->state))
                        continue;
                if (sval_is_negative(estate_min(tmp->state)) &&
                    sval_is_negative(estate_max(tmp->state)))
                        return true;
        } END_FOR_EACH_PTR(tmp);

        return false;
}

static bool has_separate_zero_null(struct sm_state *sm)
{
        struct sm_state *tmp;
        sval_t sval;

        FOR_EACH_PTR(sm->possible, tmp) {
                if (!estate_get_single_value(tmp->state, &sval))
                        continue;
                if (sval.value == 0)
                        return true;
        } END_FOR_EACH_PTR(tmp);

        return false;
}

static int split_positive_from_negative(struct expression *expr)
{
        struct sm_state *sm;
        struct returned_state_callback *cb;
        struct range_list *rl;
        const char *return_ranges;
        struct range_list *ret_rl;
        bool separate_zero;
        int undo;

        /* We're going to print the states 3 times */
        if (get_db_state_count() > 10000 / 3)
                return 0;

        if (!get_implied_rl(expr, &rl) || !rl)
                return 0;
        /* Forget about INT_MAX and larger */
        if (rl_max(rl).value <= 0)
                return 0;
        if (!sval_is_negative(rl_min(rl)))
                return 0;

        sm = get_sm_state_expr(SMATCH_EXTRA, expr);
        if (!sm)
                return 0;
        if (!has_possible_negative(sm))
                return 0;
        separate_zero = has_separate_zero_null(sm);

        if (!assume(compare_expression(expr, separate_zero ? '>' : SPECIAL_GTE, zero_expr())))
                return 0;

        return_id++;
        return_ranges = get_return_ranges_str(expr, &ret_rl);
        set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
        FOR_EACH_PTR(returned_state_callbacks, cb) {
                cb->callback(return_id, (char *)return_ranges, expr);
        } END_FOR_EACH_PTR(cb);

        end_assume();

        if (separate_zero) {
                undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));

                return_id++;
                return_ranges = get_return_ranges_str(expr, &ret_rl);
                set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
                FOR_EACH_PTR(returned_state_callbacks, cb) {
                        cb->callback(return_id, (char *)return_ranges, expr);
                } END_FOR_EACH_PTR(cb);

                if (undo)
                        end_assume();
        }

        undo = assume(compare_expression(expr, '<', zero_expr()));

        return_id++;
        return_ranges = get_return_ranges_str(expr, &ret_rl);
        set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
        FOR_EACH_PTR(returned_state_callbacks, cb) {
                cb->callback(return_id, (char *)return_ranges, expr);
        } END_FOR_EACH_PTR(cb);

        if (undo)
                end_assume();

        return 1;
}

static int call_return_state_hooks_split_null_non_null_zero(struct expression *expr)
{
        struct returned_state_callback *cb;
        struct range_list *rl;
        struct range_list *nonnull_rl;
        sval_t null_sval;
        struct range_list *null_rl = NULL;
        char *return_ranges;
        struct sm_state *sm;
        struct smatch_state *state;
        int nr_states;
        int final_pass_orig = final_pass;

        if (!expr || expr_equal_to_param(expr, -1))
                return 0;
        if (expr->type == EXPR_CALL)
                return 0;

        sm = get_sm_state_expr(SMATCH_EXTRA, expr);
        if (!sm)
                return 0;
        if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
                return 0;
        state = sm->state;
        if (!estate_rl(state))
                return 0;
        if (estate_min(state).value == 0 && estate_max(state).value == 0)
                return 0;
        if (has_possible_negative(sm))
                return 0;
        if (!has_separate_zero_null(sm))
                return 0;

        nr_states = get_db_state_count();
        if (option_info && nr_states >= 1500)
                return 0;

        rl = estate_rl(state);

        __push_fake_cur_stree();

        final_pass = 0;
        __split_whole_condition(expr);
        final_pass = final_pass_orig;

        nonnull_rl = rl_filter(rl, rl_zero());
        return_ranges = show_rl(nonnull_rl);
        set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonnull_rl));

        return_id++;
        FOR_EACH_PTR(returned_state_callbacks, cb) {
                cb->callback(return_id, return_ranges, expr);
        } END_FOR_EACH_PTR(cb);

        __push_true_states();
        __use_false_states();

        return_ranges = alloc_sname("0");
        null_sval = sval_type_val(rl_type(rl), 0);
        add_range(&null_rl, null_sval, null_sval);
        set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(null_rl));
        return_id++;
        FOR_EACH_PTR(returned_state_callbacks, cb) {
                cb->callback(return_id, return_ranges, expr);
        } END_FOR_EACH_PTR(cb);

        __merge_true_states();
        __free_fake_cur_stree();

        return 1;
}

static bool is_kernel_success_fail(struct sm_state *sm)
{
        struct sm_state *tmp;
        struct range_list *rl;
        bool has_zero = false;
        bool has_neg = false;

        if (!type_signed(estate_type(sm->state)))
                return false;

        FOR_EACH_PTR(sm->possible, tmp) {
                rl = estate_rl(tmp->state);
                if (!rl)
                        return false;
                if (rl_min(rl).value == 0 && rl_max(rl).value == 0) {
                        has_zero = true;
                        continue;
                }
                has_neg = true;
                if (rl_min(rl).value >= -4095 && rl_max(rl).value < 0)
                        continue;
                if (strcmp(tmp->state->name, "s32min-(-1)") == 0)
                        continue;
                if (strcmp(tmp->state->name, "s32min-(-1),1-s32max") == 0)
                        continue;
                return false;
        } END_FOR_EACH_PTR(tmp);

        return has_zero && has_neg;
}

static int call_return_state_hooks_split_success_fail(struct expression *expr)
{
        struct sm_state *sm;
        struct range_list *rl;
        struct range_list *nonzero_rl;
        sval_t zero_sval;
        struct range_list *zero_rl = NULL;
        int nr_states;
        struct returned_state_callback *cb;
        char *return_ranges;
        int final_pass_orig = final_pass;

        if (option_project != PROJ_KERNEL)
                return 0;

        nr_states = get_db_state_count();
        if (nr_states > 2000)
                return 0;

        sm = get_sm_state_expr(SMATCH_EXTRA, expr);
        if (!sm)
                return 0;
        if (ptr_list_size((struct ptr_list *)sm->possible) == 1)
                return 0;
        if (!is_kernel_success_fail(sm))
                return 0;

        rl = estate_rl(sm->state);
        if (!rl)
                return 0;

        __push_fake_cur_stree();

        final_pass = 0;
        __split_whole_condition(expr);
        final_pass = final_pass_orig;

        nonzero_rl = rl_filter(rl, rl_zero());
        nonzero_rl = cast_rl(cur_func_return_type(), nonzero_rl);
        return_ranges = show_rl(nonzero_rl);
        set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(nonzero_rl));

        return_id++;
        FOR_EACH_PTR(returned_state_callbacks, cb) {
                cb->callback(return_id, return_ranges, expr);
        } END_FOR_EACH_PTR(cb);

        __push_true_states();
        __use_false_states();

        return_ranges = alloc_sname("0");
        zero_sval = sval_type_val(rl_type(rl), 0);
        add_range(&zero_rl, zero_sval, zero_sval);
        set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(zero_rl));
        return_id++;
        FOR_EACH_PTR(returned_state_callbacks, cb) {
                cb->callback(return_id, return_ranges, expr);
        } END_FOR_EACH_PTR(cb);

        __merge_true_states();
        __free_fake_cur_stree();

        return 1;
}

static int is_boolean(struct expression *expr)
{
        struct range_list *rl;

        if (!get_implied_rl(expr, &rl))
                return 0;
        if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
                return 1;
        return 0;
}

static int splitable_function_call(struct expression *expr)
{
        struct sm_state *sm;
        char buf[64];

        if (!expr || expr->type != EXPR_CALL)
                return 0;
        snprintf(buf, sizeof(buf), "return %p", expr);
        sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
        return split_possible_helper(sm, expr);
}

static struct sm_state *find_bool_param(void)
{
        struct stree *start_states;
        struct symbol *arg;
        struct sm_state *sm, *tmp;
        sval_t sval;

        start_states = get_start_states();

        FOR_EACH_PTR_REVERSE(cur_func_sym->ctype.base_type->arguments, arg) {
                if (!arg->ident)
                        continue;
                sm = get_sm_state_stree(start_states, SMATCH_EXTRA, arg->ident->name, arg);
                if (!sm)
                        continue;
                if (rl_min(estate_rl(sm->state)).value != 0 ||
                    rl_max(estate_rl(sm->state)).value != 1)
                        continue;
                goto found;
        } END_FOR_EACH_PTR_REVERSE(arg);

        return NULL;

found:
        /*
         * Check if it's splitable.  If not, then splitting it up is likely not
         * useful for the callers.
         */
        FOR_EACH_PTR(sm->possible, tmp) {
                if (is_merged(tmp))
                        continue;
                if (!estate_get_single_value(tmp->state, &sval))
                        return NULL;
        } END_FOR_EACH_PTR(tmp);

        return sm;
}

static int split_on_bool_sm(struct sm_state *sm, struct expression *expr)
{
        struct returned_state_callback *cb;
        struct range_list *ret_rl;
        const char *return_ranges;
        struct sm_state *tmp;
        int ret = 0;
        struct state_list *already_handled = NULL;

        if (!sm || !sm->merged)
                return 0;

        if (too_many_possible(sm))
                return 0;

        FOR_EACH_PTR(sm->possible, tmp) {
                if (tmp->merged)
                        continue;
                if (ptr_in_list(tmp, already_handled))
                        continue;
                add_ptr_list(&already_handled, tmp);

                ret = 1;
                __push_fake_cur_stree();

                overwrite_states_using_pool(sm, tmp);

                return_ranges = get_return_ranges_str(expr, &ret_rl);
                set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));
                return_id++;
                FOR_EACH_PTR(returned_state_callbacks, cb) {
                        cb->callback(return_id, (char *)return_ranges, expr);
                } END_FOR_EACH_PTR(cb);

                __free_fake_cur_stree();
        } END_FOR_EACH_PTR(tmp);

        free_slist(&already_handled);

        return ret;
}

static int split_by_bool_param(struct expression *expr)
{
        struct sm_state *start_sm, *sm;
        sval_t sval;

        start_sm = find_bool_param();
        if (!start_sm)
                return 0;
        sm = get_sm_state(SMATCH_EXTRA, start_sm->name, start_sm->sym);
        if (!sm || estate_get_single_value(sm->state, &sval))
                return 0;

        if (get_db_state_count() * 2 >= 2000)
                return 0;

        return split_on_bool_sm(sm, expr);
}

static int split_by_null_nonnull_param(struct expression *expr)
{
        struct symbol *arg;
        struct sm_state *sm;
        int nr_possible;

        /* function must only take one pointer */
        if (ptr_list_size((struct ptr_list *)cur_func_sym->ctype.base_type->arguments) != 1)
                return 0;
        arg = first_ptr_list((struct ptr_list *)cur_func_sym->ctype.base_type->arguments);
        if (!arg->ident)
                return 0;
        if (get_real_base_type(arg)->type != SYM_PTR)
                return 0;

        if (param_was_set_var_sym(arg->ident->name, arg))
                return 0;
        sm = get_sm_state(SMATCH_EXTRA, arg->ident->name, arg);
        if (!sm)
                return 0;

        if (!has_separate_zero_null(sm))
                return 0;

        nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
        if (get_db_state_count() * nr_possible >= 2000)
                return 0;

        return split_on_bool_sm(sm, expr);
}

struct expression *strip_expr_statement(struct expression *expr)
{
        struct expression *orig = expr;
        struct statement *stmt, *last_stmt;

        if (!expr)
                return NULL;
        if (expr->type == EXPR_PREOP && expr->op == '(')
                expr = expr->unop;
        if (expr->type != EXPR_STATEMENT)
                return orig;
        stmt = expr->statement;
        if (!stmt || stmt->type != STMT_COMPOUND)
                return orig;

        last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
        if (!last_stmt || last_stmt->type == STMT_LABEL)
                last_stmt = last_stmt->label_statement;
        if (!last_stmt || last_stmt->type != STMT_EXPRESSION)
                return orig;
        return strip_expr(last_stmt->expression);
}

static bool is_kernel_error_path(struct expression *expr)
{
        struct range_list *rl;

        /*
         * Splitting up returns requires resources.  It also requires resources
         * for the caller.  It doesn't seem worth it to split anything up.
         */
        if (!get_implied_rl(expr, &rl))
                return false;
        if (rl_type(rl) != &int_ctype)
                return false;
        if (rl_min(rl).value >= -4095 &&
            rl_max(rl).value < 0)
                return true;
        return false;
}

static void call_return_state_hooks(struct expression *expr)
{
        struct returned_state_callback *cb;
        struct range_list *ret_rl;
        const char *return_ranges;
        int nr_states;
        sval_t sval;

        if (__path_is_null())
                return;

        expr = strip_expr(expr);
        expr = strip_expr_statement(expr);

        if (is_impossible_path())
                goto vanilla;

        if (expr && (expr->type == EXPR_COMPARE ||
                     !get_implied_value(expr, &sval)) &&
            (is_condition(expr) || is_boolean(expr))) {
                call_return_state_hooks_compare(expr);
                return;
        } else if (call_return_state_hooks_conditional(expr)) {
                return;
        } else if (is_kernel_error_path(expr)) {
                goto vanilla;
        } else if (call_return_state_hooks_split_possible(expr)) {
                return;
        } else if (split_positive_from_negative(expr)) {
                return;
        } else if (call_return_state_hooks_split_null_non_null_zero(expr)) {
                return;
        } else if (call_return_state_hooks_split_success_fail(expr)) {
                return;
        } else if (splitable_function_call(expr)) {
                return;
        } else if (split_by_bool_param(expr)) {
        } else if (split_by_null_nonnull_param(expr)) {
                return;
        }

vanilla:
        return_ranges = get_return_ranges_str(expr, &ret_rl);
        set_state(RETURN_ID, "return_ranges", NULL, alloc_estate_rl(ret_rl));

        return_id++;
        nr_states = get_db_state_count();
        if (nr_states >= 10000) {
                match_return_info(return_id, (char *)return_ranges, expr);
                print_limited_param_set(return_id, (char *)return_ranges, expr);
                mark_all_params_untracked(return_id, (char *)return_ranges, expr);
                return;
        }
        FOR_EACH_PTR(returned_state_callbacks, cb) {
                cb->callback(return_id, (char *)return_ranges, expr);
        } END_FOR_EACH_PTR(cb);
}

static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
{
        struct returned_member_callback *cb;
        struct stree *stree;
        struct sm_state *sm;
        struct symbol *type;
        char *name;
        char member_name[256];
        int len;

        type = get_type(expr);
        if (!type || type->type != SYM_PTR)
                return;
        name = expr_to_var(expr);
        if (!name)
                return;

        member_name[sizeof(member_name) - 1] = '\0';
        strcpy(member_name, "$");

        len = strlen(name);
        FOR_EACH_PTR(returned_member_callbacks, cb) {
                stree = __get_cur_stree();
                FOR_EACH_MY_SM(cb->owner, stree, sm) {
                        if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
                                strcpy(member_name, "*$");
                                cb->callback(return_id, return_ranges, expr, member_name, sm->state);
                                continue;
                        }
                        if (strncmp(sm->name, name, len) != 0)
                                continue;
                        if (strncmp(sm->name + len, "->", 2) != 0)
                                continue;
                        snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
                        cb->callback(return_id, return_ranges, expr, member_name, sm->state);
                } END_FOR_EACH_SM(sm);
        } END_FOR_EACH_PTR(cb);

        free_string(name);
}

static void reset_memdb(struct symbol *sym)
{
        mem_sql(NULL, NULL, "delete from caller_info;");
        mem_sql(NULL, NULL, "delete from return_states;");
        mem_sql(NULL, NULL, "delete from call_implies;");
        mem_sql(NULL, NULL, "delete from return_implies;");
}

static void match_end_func_info(struct symbol *sym)
{
        if (__path_is_null())
                return;
        call_return_state_hooks(NULL);
}

static void match_after_func(struct symbol *sym)
{
        if (!__inline_fn)
                reset_memdb(sym);
}

static void init_memdb(void)
{
        char *err = NULL;
        int rc;
        const char *schema_files[] = {
                "db/db.schema",
                "db/caller_info.schema",
                "db/common_caller_info.schema",
                "db/return_states.schema",
                "db/function_type_size.schema",
                "db/type_size.schema",
                "db/function_type_info.schema",
                "db/type_info.schema",
                "db/call_implies.schema",
                "db/return_implies.schema",
                "db/function_ptr.schema",
                "db/local_values.schema",
                "db/function_type_value.schema",
                "db/type_value.schema",
                "db/function_type.schema",
                "db/data_info.schema",
                "db/parameter_name.schema",
                "db/constraints.schema",
                "db/constraints_required.schema",
                "db/fn_ptr_data_link.schema",
                "db/fn_data_link.schema",
                "db/mtag_about.schema",
                "db/mtag_info.schema",
                "db/mtag_map.schema",
                "db/mtag_data.schema",
                "db/mtag_alias.schema",
        };
        static char buf[4096];
        int fd;
        int ret;
        int i;

        rc = sqlite3_open(":memory:", &mem_db);
        if (rc != SQLITE_OK) {
                sm_ierror("starting In-Memory database.");
                return;
        }

        for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
                fd = open_schema_file(schema_files[i]);
                if (fd < 0)
                        continue;
                ret = read(fd, buf, sizeof(buf));
                if (ret < 0) {
                        sm_ierror("failed to read: %s", schema_files[i]);
                        continue;
                }
                close(fd);
                if (ret == sizeof(buf)) {
                        sm_ierror("Schema file too large:  %s (limit %zd bytes)",
                               schema_files[i], sizeof(buf));
                        continue;
                }
                buf[ret] = '\0';
                rc = sqlite3_exec(mem_db, buf, NULL, NULL, &err);
                if (rc != SQLITE_OK) {
                        sm_ierror("SQL error #2: %s", err);
                        sm_ierror("%s", buf);
                }
        }
}

static void init_cachedb(void)
{
        char *err = NULL;
        int rc;
        const char *schema_files[] = {
                "db/call_implies.schema",
                "db/return_implies.schema",
                "db/type_info.schema",
                "db/mtag_about.schema",
                "db/mtag_data.schema",
                "db/mtag_info.schema",
                "db/sink_info.schema",
        };
        static char buf[4096];
        int fd;
        int ret;
        int i;

        rc = sqlite3_open(":memory:", &cache_db);
        if (rc != SQLITE_OK) {
                sm_ierror("starting In-Memory database.");
                return;
        }

        for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
                fd = open_schema_file(schema_files[i]);
                if (fd < 0)
                        continue;
                ret = read(fd, buf, sizeof(buf));
                if (ret < 0) {
                        sm_ierror("failed to read: %s", schema_files[i]);
                        continue;
                }
                close(fd);
                if (ret == sizeof(buf)) {
                        sm_ierror("Schema file too large:  %s (limit %zd bytes)",
                               schema_files[i], sizeof(buf));
                        continue;
                }
                buf[ret] = '\0';
                rc = sqlite3_exec(cache_db, buf, NULL, NULL, &err);
                if (rc != SQLITE_OK) {
                        sm_ierror("SQL error #2: %s", err);
                        sm_ierror("%s", buf);
                }
        }
}

static int save_cache_data(void *_table, int argc, char **argv, char **azColName)
{
        static char buf[4096];
        char tmp[256];
        char *p = buf;
        char *table = _table;
        int i;


        p += snprintf(p, 4096 - (p - buf), "insert or ignore into %s values (", table);
        for (i = 0; i < argc; i++) {
                if (i)
                        p += snprintf(p, 4096 - (p - buf), ", ");
                sqlite3_snprintf(sizeof(tmp), tmp, "%q", escape_newlines(argv[i]));
                p += snprintf(p, 4096 - (p - buf), "'%s'", tmp);

        }
        p += snprintf(p, 4096 - (p - buf), ");");
        if (p - buf > 4096)
                return 0;

        sm_msg("SQL: %s", buf);
        return 0;
}

static void dump_cache(struct symbol_list *sym_list)
{
        const char *cache_tables[] = {
                "type_info", "return_implies", "call_implies", "mtag_data",
                "mtag_info", "mtag_about", "sink_info",
        };
        char buf[64];
        int i;

        if (!option_info)
                return;

        for (i = 0; i < ARRAY_SIZE(cache_tables); i++) {
                snprintf(buf, sizeof(buf), "select * from %s;", cache_tables[i]);
                cache_sql(&save_cache_data, (char *)cache_tables[i], buf);
        }
}

void open_smatch_db(char *db_file)
{
        int rc;

        if (option_no_db)
                return;

        use_states = malloc(num_checks + 1);
        memset(use_states, 0xff, num_checks + 1);

        init_memdb();
        init_cachedb();

        rc = sqlite3_open_v2(db_file, &smatch_db, SQLITE_OPEN_READONLY, NULL);
        if (rc != SQLITE_OK) {
                option_no_db = 1;
                return;
        }
        run_sql(NULL, NULL,
                "PRAGMA cache_size = %d;", SQLITE_CACHE_PAGES);
        return;
}

static void register_common_funcs(void)
{
        struct token *token;
        char *func;
        char filename[256];

        if (option_project == PROJ_NONE)
                strcpy(filename, "common_functions");
        else
                snprintf(filename, 256, "%s.common_functions", option_project_str);

        token = get_tokens_file(filename);
        if (!token)
                return;
        if (token_type(token) != TOKEN_STREAMBEGIN)
                return;
        token = token->next;
        while (token_type(token) != TOKEN_STREAMEND) {
                if (token_type(token) != TOKEN_IDENT)
                        return;
                func = alloc_string(show_ident(token->ident));
                add_ptr_list(&common_funcs, func);
                token = token->next;
        }
        clear_token_alloc();
}

static char *get_next_string(char **str)
{
        static char string[256];
        char *start;
        char *p = *str;
        int len, i, j;

        if (*p == '\0')
                return NULL;
        start = p;

        while (*p != '\0' && *p != '\n') {
                if (*p == '\\' && *(p + 1) == ' ') {
                        p += 2;
                        continue;
                }
                if (*p == ' ')
                        break;
                p++;
        }

        len = p - start;
        if (len >= sizeof(string)) {
                memcpy(string, start, sizeof(string));
                string[sizeof(string) - 1] = '\0';
                sm_ierror("return_fix: '%s' too long", string);
                **str = '\0';
                return NULL;
        }
        memcpy(string, start, len);
        string[len] = '\0';
        for (i = 0; i < sizeof(string) - 1; i++) {
                if (string[i] == '\\' && string[i + 1] == ' ') {
                        for (j = i; string[j] != '\0'; j++)
                                string[j] = string[j + 1];
                }
        }
        if (*p != '\0')
                p++;
        *str = p;
        return string;
}

static void register_return_replacements(void)
{
        char *func, *orig, *new;
        char filename[256];
        char buf[4096];
        int fd, ret, i;
        char *p;

        snprintf(filename, 256, "db/%s.return_fixes", option_project_str);
        fd = open_schema_file(filename);
        if (fd < 0)
                return;
        ret = read(fd, buf, sizeof(buf));
        close(fd);
        if (ret < 0)
                return;
        if (ret == sizeof(buf)) {
                sm_ierror("file too large:  %s (limit %zd bytes)",
                       filename, sizeof(buf));
                return;
        }
        buf[ret] = '\0';

        p = buf;
        while (*p) {
                get_next_string(&p);
                replace_count++;
        }
        if (replace_count == 0 || replace_count % 3 != 0) {
                replace_count = 0;
                return;
        }
        replace_table = malloc(replace_count * sizeof(char *));

        p = buf;
        i = 0;
        while (*p) {
                func = alloc_string(get_next_string(&p));
                orig = alloc_string(get_next_string(&p));
                new  = alloc_string(get_next_string(&p));

                replace_table[i++] = func;
                replace_table[i++] = orig;
                replace_table[i++] = new;
        }
}

void register_definition_db_callbacks(int id)
{
        add_hook(&match_call_info, FUNCTION_CALL_HOOK);
        add_hook(&match_call_info_new, FUNCTION_CALL_HOOK);
        add_split_return_callback(match_return_info);
        add_split_return_callback(print_returned_struct_members);
        add_hook(&call_return_state_hooks, RETURN_HOOK);
        add_hook(&match_end_func_info, END_FUNC_HOOK);
        add_hook(&match_after_func, AFTER_FUNC_HOOK);

        add_hook(&match_data_from_db, FUNC_DEF_HOOK);
        add_hook(&match_call_implies, FUNC_DEF_HOOK);
        add_hook(&match_return_implies, CALL_HOOK_AFTER_INLINE);

        register_common_funcs();
        register_return_replacements();

        add_hook(&dump_cache, END_FILE_HOOK);
}

void register_db_call_marker(int id)
{
        add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
}

char *return_state_to_var_sym(struct expression *expr, int param, const char *key, struct symbol **sym)
{
        struct expression *arg;
        char *name = NULL;
        char member_name[256];

        *sym = NULL;

        if (param == -1) {
                const char *star = "";

                if (expr->type != EXPR_ASSIGNMENT)
                        return NULL;
                if (get_type(expr->left) == &int_ctype && strcmp(key, "$") != 0)
                        return NULL;
                name = expr_to_var_sym(expr->left, sym);
                if (!name)
                        return NULL;
                if (key[0] == '*') {
                        star = "*";
                        key++;
                }
                if (strncmp(key, "$", 1) != 0)
                        return name;
                snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
                free_string(name);
                return alloc_string(member_name);
        }

        while (expr->type == EXPR_ASSIGNMENT)
                expr = strip_expr(expr->right);
        if (expr->type != EXPR_CALL)
                return NULL;

        arg = get_argument_from_call_expr(expr->args, param);
        if (!arg)
                return NULL;

        return get_variable_from_key(arg, key, sym);
}

char *get_variable_from_key(struct expression *arg, const char *key, struct symbol **sym)
{
        struct symbol *type;
        char buf[256];
        char *tmp;
        int star_cnt = 0;
        bool add_dot = false;

        if (!arg)
                return NULL;

        arg = strip_expr(arg);

        if (strcmp(key, "$") == 0)
                return expr_to_var_sym(arg, sym);

        if (strcmp(key, "*$") == 0) {
                if (arg->type == EXPR_PREOP && arg->op == '&') {
                        arg = strip_expr(arg->unop);
                        return expr_to_var_sym(arg, sym);
                } else {
                        tmp = expr_to_var_sym(arg, sym);
                        if (!tmp)
                                return NULL;
                        snprintf(buf, sizeof(buf), "*%s", tmp);
                        free_string(tmp);
                        return alloc_string(buf);
                }
        }

        if (strncmp(key, "(*$)", 4) == 0) {
                char buf[64];

                if (arg->type == EXPR_PREOP && arg->op == '&') {
                        arg = strip_expr(arg->unop);
                        snprintf(buf, sizeof(buf), "$%s", key + 4);
                        return get_variable_from_key(arg, buf, sym);
                } else {
                        tmp = expr_to_var_sym(arg, sym);
                        if (!tmp)
                                return NULL;
                        snprintf(buf, sizeof(buf), "(*%s)%s", tmp, key + 4);
                        free_string(tmp);
                        return alloc_string(buf);
                }
        }

        while (key[0] == '*') {
                star_cnt++;
                key++;
        }

        /*
         * FIXME:  This is a hack.
         * We should be able to parse expressions like (*$)->foo and *$->foo.
         */
        type = get_type(arg);
        if (is_struct_ptr(type))
                add_dot = true;

        if (arg->type == EXPR_PREOP && arg->op == '&' && star_cnt && !add_dot) {
                arg = strip_expr(arg->unop);
                star_cnt--;
        }

        if (arg->type == EXPR_PREOP && arg->op == '&') {
                arg = strip_expr(arg->unop);
                tmp = expr_to_var_sym(arg, sym);
                if (!tmp)
                        return NULL;
                snprintf(buf, sizeof(buf), "%.*s%s.%s",
                         star_cnt, "**********", tmp, key + 3);
                return alloc_string(buf);
        }

        tmp = expr_to_var_sym(arg, sym);
        if (!tmp)
                return NULL;
        snprintf(buf, sizeof(buf), "%.*s%s%s", star_cnt, "**********", tmp, key + 1);
        free_string(tmp);
        return alloc_string(buf);
}

char *get_chunk_from_key(struct expression *arg, char *key, struct symbol **sym, struct var_sym_list **vsl)
{
        *vsl = NULL;

        if (strcmp("$", key) == 0)
                return expr_to_chunk_sym_vsl(arg, sym, vsl);
        return get_variable_from_key(arg, key, sym);
}

const char *state_name_to_param_name(const char *state_name, const char *param_name)
{
        int star_cnt = 0;
        int name_len;
        char buf[256];

        name_len = strlen(param_name);

        while (state_name[0] == '*') {
                star_cnt++;
                state_name++;
        }

        /* ten out of ten stars! */
        if (star_cnt > 10)
                return NULL;

        if (strncmp(state_name, "(*", 2) == 0 &&
            strncmp(state_name + 2, param_name, name_len) == 0 &&
            state_name[name_len + 2] == ')') {
                snprintf(buf, sizeof(buf), "%.*s(*$)%s", star_cnt, "**********",
                         state_name + name_len + 3);
                return alloc_sname(buf);
        }

        if (strcmp(state_name, param_name) == 0) {
                snprintf(buf, sizeof(buf), "%.*s$", star_cnt, "**********");
                return alloc_sname(buf);
        }

        /* check for '-' from "->" */
        if (strncmp(state_name, param_name, name_len) == 0 &&
            state_name[name_len] == '-') {
                snprintf(buf, sizeof(buf), "%.*s$%s", star_cnt, "**********", state_name + name_len);
                return alloc_sname(buf);
        }
        return NULL;
}

const char *get_param_name_var_sym(const char *name, struct symbol *sym)
{
        if (!sym || !sym->ident)
                return NULL;

        return state_name_to_param_name(name, sym->ident->name);
}

const char *get_mtag_name_var_sym(const char *state_name, struct symbol *sym)
{
        struct symbol *type;
        const char *sym_name;
        int name_len;
        static char buf[256];

        /*
         * mtag_name is different from param_name because mtags can be a struct
         * instead of a struct pointer.  But we want to treat it like a pointer
         * because really an mtag is a pointer.  Or in other words, if you pass
         * a struct foo then you want to talk about foo.bar but with an mtag
         * you want to refer to it as foo->bar.
         *
         */

        if (!sym || !sym->ident)
                return NULL;

        type = get_real_base_type(sym);
        if (type && type->type == SYM_BASETYPE)
                return "*$";

        sym_name = sym->ident->name;
        name_len = strlen(sym_name);

        if (state_name[name_len] == '.' && /* check for '-' from "->" */
            strncmp(state_name, sym_name, name_len) == 0) {
                snprintf(buf, sizeof(buf), "$->%s", state_name + name_len + 1);
                return buf;
        }

        return state_name_to_param_name(state_name, sym_name);
}

const char *get_mtag_name_expr(struct expression *expr)
{
        char *name;
        struct symbol *sym;
        const char *ret = NULL;

        name = expr_to_var_sym(expr, &sym);
        if (!name || !sym)
                goto free;

        ret = get_mtag_name_var_sym(name, sym);
free:
        free_string(name);
        return ret;
}

const char *get_param_name(struct sm_state *sm)
{
        return get_param_name_var_sym(sm->name, sm->sym);
}

char *get_data_info_name(struct expression *expr)
{
        struct symbol *sym;
        char *name;
        char buf[256];
        char *ret = NULL;

        expr = strip_expr(expr);
        name = get_member_name(expr);
        if (name)
                return name;
        name = expr_to_var_sym(expr, &sym);
        if (!name || !sym)
                goto free;
        if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
                goto free;
        if (sym->ctype.modifiers & MOD_STATIC)
                snprintf(buf, sizeof(buf), "static %s", name);
        else
                snprintf(buf, sizeof(buf), "global %s", name);
        ret = alloc_sname(buf);
free:
        free_string(name);
        return ret;
}