blob: 83740258ff1f279d4926077bfbe0a425a0245946 [file] [log] [blame]
/*
* Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License (not later!)
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* The parts for function graph printing was taken and modified from the
* Linux Kernel that were written by
* - Copyright (C) 2009 Frederic Weisbecker,
* Frederic Weisbecker gave his permission to relicense the code to
* the Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>
#include <stdint.h>
#include <limits.h>
#include <netinet/ip6.h>
#include "event-parse.h"
#include "event-utils.h"
static const char *input_buf;
static unsigned long long input_buf_ptr;
static unsigned long long input_buf_siz;
static int is_flag_field;
static int is_symbolic_field;
static int show_warning = 1;
#define do_warning(fmt, ...) \
do { \
if (show_warning) \
warning(fmt, ##__VA_ARGS__); \
} while (0)
#define do_warning_event(event, fmt, ...) \
do { \
if (!show_warning) \
continue; \
\
if (event) \
warning("[%s:%s] " fmt, event->system, \
event->name, ##__VA_ARGS__); \
else \
warning(fmt, ##__VA_ARGS__); \
} while (0)
static void init_input_buf(const char *buf, unsigned long long size)
{
input_buf = buf;
input_buf_siz = size;
input_buf_ptr = 0;
}
const char *pevent_get_input_buf(void)
{
return input_buf;
}
unsigned long long pevent_get_input_buf_ptr(void)
{
return input_buf_ptr;
}
struct event_handler {
struct event_handler *next;
int id;
const char *sys_name;
const char *event_name;
pevent_event_handler_func func;
void *context;
};
struct pevent_func_params {
struct pevent_func_params *next;
enum pevent_func_arg_type type;
};
struct pevent_function_handler {
struct pevent_function_handler *next;
enum pevent_func_arg_type ret_type;
char *name;
pevent_func_handler func;
struct pevent_func_params *params;
int nr_args;
};
static unsigned long long
process_defined_func(struct trace_seq *s, void *data, int size,
struct event_format *event, struct print_arg *arg);
static void free_func_handle(struct pevent_function_handler *func);
/**
* pevent_buffer_init - init buffer for parsing
* @buf: buffer to parse
* @size: the size of the buffer
*
* For use with pevent_read_token(), this initializes the internal
* buffer that pevent_read_token() will parse.
*/
void pevent_buffer_init(const char *buf, unsigned long long size)
{
init_input_buf(buf, size);
}
void breakpoint(void)
{
static int x;
x++;
}
struct print_arg *alloc_arg(void)
{
return calloc(1, sizeof(struct print_arg));
}
struct cmdline {
char *comm;
int pid;
};
static int cmdline_cmp(const void *a, const void *b)
{
const struct cmdline *ca = a;
const struct cmdline *cb = b;
if (ca->pid < cb->pid)
return -1;
if (ca->pid > cb->pid)
return 1;
return 0;
}
struct cmdline_list {
struct cmdline_list *next;
char *comm;
int pid;
};
static int cmdline_init(struct pevent *pevent)
{
struct cmdline_list *cmdlist = pevent->cmdlist;
struct cmdline_list *item;
struct cmdline *cmdlines;
int i;
cmdlines = malloc(sizeof(*cmdlines) * pevent->cmdline_count);
if (!cmdlines)
return -1;
i = 0;
while (cmdlist) {
cmdlines[i].pid = cmdlist->pid;
cmdlines[i].comm = cmdlist->comm;
i++;
item = cmdlist;
cmdlist = cmdlist->next;
free(item);
}
qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
pevent->cmdlines = cmdlines;
pevent->cmdlist = NULL;
return 0;
}
static const char *find_cmdline(struct pevent *pevent, int pid)
{
const struct cmdline *comm;
struct cmdline key;
if (!pid)
return "<idle>";
if (!pevent->cmdlines && cmdline_init(pevent))
return "<not enough memory for cmdlines!>";
key.pid = pid;
comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
sizeof(*pevent->cmdlines), cmdline_cmp);
if (comm)
return comm->comm;
return "<...>";
}
/**
* pevent_pid_is_registered - return if a pid has a cmdline registered
* @pevent: handle for the pevent
* @pid: The pid to check if it has a cmdline registered with.
*
* Returns 1 if the pid has a cmdline mapped to it
* 0 otherwise.
*/
int pevent_pid_is_registered(struct pevent *pevent, int pid)
{
const struct cmdline *comm;
struct cmdline key;
if (!pid)
return 1;
if (!pevent->cmdlines && cmdline_init(pevent))
return 0;
key.pid = pid;
comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
sizeof(*pevent->cmdlines), cmdline_cmp);
if (comm)
return 1;
return 0;
}
/*
* If the command lines have been converted to an array, then
* we must add this pid. This is much slower than when cmdlines
* are added before the array is initialized.
*/
static int add_new_comm(struct pevent *pevent, const char *comm, int pid)
{
struct cmdline *cmdlines = pevent->cmdlines;
const struct cmdline *cmdline;
struct cmdline key;
if (!pid)
return 0;
/* avoid duplicates */
key.pid = pid;
cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
sizeof(*pevent->cmdlines), cmdline_cmp);
if (cmdline) {
errno = EEXIST;
return -1;
}
cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
if (!cmdlines) {
errno = ENOMEM;
return -1;
}
cmdlines[pevent->cmdline_count].comm = strdup(comm);
if (!cmdlines[pevent->cmdline_count].comm) {
free(cmdlines);
errno = ENOMEM;
return -1;
}
cmdlines[pevent->cmdline_count].pid = pid;
if (cmdlines[pevent->cmdline_count].comm)
pevent->cmdline_count++;
qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
pevent->cmdlines = cmdlines;
return 0;
}
/**
* pevent_register_comm - register a pid / comm mapping
* @pevent: handle for the pevent
* @comm: the command line to register
* @pid: the pid to map the command line to
*
* This adds a mapping to search for command line names with
* a given pid. The comm is duplicated.
*/
int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
{
struct cmdline_list *item;
if (pevent->cmdlines)
return add_new_comm(pevent, comm, pid);
item = malloc(sizeof(*item));
if (!item)
return -1;
if (comm)
item->comm = strdup(comm);
else
item->comm = strdup("<...>");
if (!item->comm) {
free(item);
return -1;
}
item->pid = pid;
item->next = pevent->cmdlist;
pevent->cmdlist = item;
pevent->cmdline_count++;
return 0;
}
struct func_map {
unsigned long long addr;
char *func;
char *mod;
};
struct func_list {
struct func_list *next;
unsigned long long addr;
char *func;
char *mod;
};
static int func_cmp(const void *a, const void *b)
{
const struct func_map *fa = a;
const struct func_map *fb = b;
if (fa->addr < fb->addr)
return -1;
if (fa->addr > fb->addr)
return 1;
return 0;
}
/*
* We are searching for a record in between, not an exact
* match.
*/
static int func_bcmp(const void *a, const void *b)
{
const struct func_map *fa = a;
const struct func_map *fb = b;
if ((fa->addr == fb->addr) ||
(fa->addr > fb->addr &&
fa->addr < (fb+1)->addr))
return 0;
if (fa->addr < fb->addr)
return -1;
return 1;
}
static int func_map_init(struct pevent *pevent)
{
struct func_list *funclist;
struct func_list *item;
struct func_map *func_map;
int i;
func_map = malloc(sizeof(*func_map) * (pevent->func_count + 1));
if (!func_map)
return -1;
funclist = pevent->funclist;
i = 0;
while (funclist) {
func_map[i].func = funclist->func;
func_map[i].addr = funclist->addr;
func_map[i].mod = funclist->mod;
i++;
item = funclist;
funclist = funclist->next;
free(item);
}
qsort(func_map, pevent->func_count, sizeof(*func_map), func_cmp);
/*
* Add a special record at the end.
*/
func_map[pevent->func_count].func = NULL;
func_map[pevent->func_count].addr = 0;
func_map[pevent->func_count].mod = NULL;
pevent->func_map = func_map;
pevent->funclist = NULL;
return 0;
}
static struct func_map *
find_func(struct pevent *pevent, unsigned long long addr)
{
struct func_map *func;
struct func_map key;
if (!pevent->func_map)
func_map_init(pevent);
key.addr = addr;
func = bsearch(&key, pevent->func_map, pevent->func_count,
sizeof(*pevent->func_map), func_bcmp);
return func;
}
/**
* pevent_find_function - find a function by a given address
* @pevent: handle for the pevent
* @addr: the address to find the function with
*
* Returns a pointer to the function stored that has the given
* address. Note, the address does not have to be exact, it
* will select the function that would contain the address.
*/
const char *pevent_find_function(struct pevent *pevent, unsigned long long addr)
{
struct func_map *map;
map = find_func(pevent, addr);
if (!map)
return NULL;
return map->func;
}
/**
* pevent_find_function_address - find a function address by a given address
* @pevent: handle for the pevent
* @addr: the address to find the function with
*
* Returns the address the function starts at. This can be used in
* conjunction with pevent_find_function to print both the function
* name and the function offset.
*/
unsigned long long
pevent_find_function_address(struct pevent *pevent, unsigned long long addr)
{
struct func_map *map;
map = find_func(pevent, addr);
if (!map)
return 0;
return map->addr;
}
/**
* pevent_register_function - register a function with a given address
* @pevent: handle for the pevent
* @function: the function name to register
* @addr: the address the function starts at
* @mod: the kernel module the function may be in (NULL for none)
*
* This registers a function name with an address and module.
* The @func passed in is duplicated.
*/
int pevent_register_function(struct pevent *pevent, char *func,
unsigned long long addr, char *mod)
{
struct func_list *item = malloc(sizeof(*item));
if (!item)
return -1;
item->next = pevent->funclist;
item->func = strdup(func);
if (!item->func)
goto out_free;
if (mod) {
item->mod = strdup(mod);
if (!item->mod)
goto out_free_func;
} else
item->mod = NULL;
item->addr = addr;
pevent->funclist = item;
pevent->func_count++;
return 0;
out_free_func:
free(item->func);
item->func = NULL;
out_free:
free(item);
errno = ENOMEM;
return -1;
}
/**
* pevent_print_funcs - print out the stored functions
* @pevent: handle for the pevent
*
* This prints out the stored functions.
*/
void pevent_print_funcs(struct pevent *pevent)
{
int i;
if (!pevent->func_map)
func_map_init(pevent);
for (i = 0; i < (int)pevent->func_count; i++) {
printf("%016llx %s",
pevent->func_map[i].addr,
pevent->func_map[i].func);
if (pevent->func_map[i].mod)
printf(" [%s]\n", pevent->func_map[i].mod);
else
printf("\n");
}
}
struct printk_map {
unsigned long long addr;
char *printk;
};
struct printk_list {
struct printk_list *next;
unsigned long long addr;
char *printk;
};
static int printk_cmp(const void *a, const void *b)
{
const struct printk_map *pa = a;
const struct printk_map *pb = b;
if (pa->addr < pb->addr)
return -1;
if (pa->addr > pb->addr)
return 1;
return 0;
}
static int printk_map_init(struct pevent *pevent)
{
struct printk_list *printklist;
struct printk_list *item;
struct printk_map *printk_map;
int i;
printk_map = malloc(sizeof(*printk_map) * (pevent->printk_count + 1));
if (!printk_map)
return -1;
printklist = pevent->printklist;
i = 0;
while (printklist) {
printk_map[i].printk = printklist->printk;
printk_map[i].addr = printklist->addr;
i++;
item = printklist;
printklist = printklist->next;
free(item);
}
qsort(printk_map, pevent->printk_count, sizeof(*printk_map), printk_cmp);
pevent->printk_map = printk_map;
pevent->printklist = NULL;
return 0;
}
static struct printk_map *
find_printk(struct pevent *pevent, unsigned long long addr)
{
struct printk_map *printk;
struct printk_map key;
if (!pevent->printk_map && printk_map_init(pevent))
return NULL;
key.addr = addr;
printk = bsearch(&key, pevent->printk_map, pevent->printk_count,
sizeof(*pevent->printk_map), printk_cmp);
return printk;
}
/**
* pevent_register_print_string - register a string by its address
* @pevent: handle for the pevent
* @fmt: the string format to register
* @addr: the address the string was located at
*
* This registers a string by the address it was stored in the kernel.
* The @fmt passed in is duplicated.
*/
int pevent_register_print_string(struct pevent *pevent, const char *fmt,
unsigned long long addr)
{
struct printk_list *item = malloc(sizeof(*item));
char *p;
if (!item)
return -1;
item->next = pevent->printklist;
item->addr = addr;
/* Strip off quotes and '\n' from the end */
if (fmt[0] == '"')
fmt++;
item->printk = strdup(fmt);
if (!item->printk)
goto out_free;
p = item->printk + strlen(item->printk) - 1;
if (*p == '"')
*p = 0;
p -= 2;
if (strcmp(p, "\\n") == 0)
*p = 0;
pevent->printklist = item;
pevent->printk_count++;
return 0;
out_free:
free(item);
errno = ENOMEM;
return -1;
}
/**
* pevent_print_printk - print out the stored strings
* @pevent: handle for the pevent
*
* This prints the string formats that were stored.
*/
void pevent_print_printk(struct pevent *pevent)
{
int i;
if (!pevent->printk_map)
printk_map_init(pevent);
for (i = 0; i < (int)pevent->printk_count; i++) {
printf("%016llx %s\n",
pevent->printk_map[i].addr,
pevent->printk_map[i].printk);
}
}
static struct event_format *alloc_event(void)
{
return calloc(1, sizeof(struct event_format));
}
static int add_event(struct pevent *pevent, struct event_format *event)
{
int i;
struct event_format **events = realloc(pevent->events, sizeof(event) *
(pevent->nr_events + 1));
if (!events)
return -1;
pevent->events = events;
for (i = 0; i < pevent->nr_events; i++) {
if (pevent->events[i]->id > event->id)
break;
}
if (i < pevent->nr_events)
memmove(&pevent->events[i + 1],
&pevent->events[i],
sizeof(event) * (pevent->nr_events - i));
pevent->events[i] = event;
pevent->nr_events++;
event->pevent = pevent;
return 0;
}
static int event_item_type(enum event_type type)
{
switch (type) {
case EVENT_ITEM ... EVENT_SQUOTE:
return 1;
case EVENT_ERROR ... EVENT_DELIM:
default:
return 0;
}
}
static void free_flag_sym(struct print_flag_sym *fsym)
{
struct print_flag_sym *next;
while (fsym) {
next = fsym->next;
free(fsym->value);
free(fsym->str);
free(fsym);
fsym = next;
}
}
static void free_arg(struct print_arg *arg)
{
struct print_arg *farg;
if (!arg)
return;
switch (arg->type) {
case PRINT_ATOM:
free(arg->atom.atom);
break;
case PRINT_FIELD:
free(arg->field.name);
break;
case PRINT_FLAGS:
free_arg(arg->flags.field);
free(arg->flags.delim);
free_flag_sym(arg->flags.flags);
break;
case PRINT_SYMBOL:
free_arg(arg->symbol.field);
free_flag_sym(arg->symbol.symbols);
break;
case PRINT_HEX:
free_arg(arg->hex.field);
free_arg(arg->hex.size);
break;
case PRINT_TYPE:
free(arg->typecast.type);
free_arg(arg->typecast.item);
break;
case PRINT_STRING:
case PRINT_BSTRING:
free(arg->string.string);
break;
case PRINT_DYNAMIC_ARRAY:
free(arg->dynarray.index);
break;
case PRINT_OP:
free(arg->op.op);
free_arg(arg->op.left);
free_arg(arg->op.right);
break;
case PRINT_FUNC:
while (arg->func.args) {
farg = arg->func.args;
arg->func.args = farg->next;
free_arg(farg);
}
break;
case PRINT_NULL:
default:
break;
}
free(arg);
}
static enum event_type get_type(int ch)
{
if (ch == '\n')
return EVENT_NEWLINE;
if (isspace(ch))
return EVENT_SPACE;
if (isalnum(ch) || ch == '_')
return EVENT_ITEM;
if (ch == '\'')
return EVENT_SQUOTE;
if (ch == '"')
return EVENT_DQUOTE;
if (!isprint(ch))
return EVENT_NONE;
if (ch == '(' || ch == ')' || ch == ',')
return EVENT_DELIM;
return EVENT_OP;
}
static int __read_char(void)
{
if (input_buf_ptr >= input_buf_siz)
return -1;
return input_buf[input_buf_ptr++];
}
static int __peek_char(void)
{
if (input_buf_ptr >= input_buf_siz)
return -1;
return input_buf[input_buf_ptr];
}
/**
* pevent_peek_char - peek at the next character that will be read
*
* Returns the next character read, or -1 if end of buffer.
*/
int pevent_peek_char(void)
{
return __peek_char();
}
static int extend_token(char **tok, char *buf, int size)
{
char *newtok = realloc(*tok, size);
if (!newtok) {
free(*tok);
*tok = NULL;
return -1;
}
if (!*tok)
strcpy(newtok, buf);
else
strcat(newtok, buf);
*tok = newtok;
return 0;
}
static enum event_type force_token(const char *str, char **tok);
static enum event_type __read_token(char **tok)
{
char buf[BUFSIZ];
int ch, last_ch, quote_ch, next_ch;
int i = 0;
int tok_size = 0;
enum event_type type;
*tok = NULL;
ch = __read_char();
if (ch < 0)
return EVENT_NONE;
type = get_type(ch);
if (type == EVENT_NONE)
return type;
buf[i++] = ch;
switch (type) {
case EVENT_NEWLINE:
case EVENT_DELIM:
if (asprintf(tok, "%c", ch) < 0)
return EVENT_ERROR;
return type;
case EVENT_OP:
switch (ch) {
case '-':
next_ch = __peek_char();
if (next_ch == '>') {
buf[i++] = __read_char();
break;
}
/* fall through */
case '+':
case '|':
case '&':
case '>':
case '<':
last_ch = ch;
ch = __peek_char();
if (ch != last_ch)
goto test_equal;
buf[i++] = __read_char();
switch (last_ch) {
case '>':
case '<':
goto test_equal;
default:
break;
}
break;
case '!':
case '=':
goto test_equal;
default: /* what should we do instead? */
break;
}
buf[i] = 0;
*tok = strdup(buf);
return type;
test_equal:
ch = __peek_char();
if (ch == '=')
buf[i++] = __read_char();
goto out;
case EVENT_DQUOTE:
case EVENT_SQUOTE:
/* don't keep quotes */
i--;
quote_ch = ch;
last_ch = 0;
concat:
do {
if (i == (BUFSIZ - 1)) {
buf[i] = 0;
tok_size += BUFSIZ;
if (extend_token(tok, buf, tok_size) < 0)
return EVENT_NONE;
i = 0;
}
last_ch = ch;
ch = __read_char();
buf[i++] = ch;
/* the '\' '\' will cancel itself */
if (ch == '\\' && last_ch == '\\')
last_ch = 0;
} while (ch != quote_ch || last_ch == '\\');
/* remove the last quote */
i--;
/*
* For strings (double quotes) check the next token.
* If it is another string, concatinate the two.
*/
if (type == EVENT_DQUOTE) {
unsigned long long save_input_buf_ptr = input_buf_ptr;
do {
ch = __read_char();
} while (isspace(ch));
if (ch == '"')
goto concat;
input_buf_ptr = save_input_buf_ptr;
}
goto out;
case EVENT_ERROR ... EVENT_SPACE:
case EVENT_ITEM:
default:
break;
}
while (get_type(__peek_char()) == type) {
if (i == (BUFSIZ - 1)) {
buf[i] = 0;
tok_size += BUFSIZ;
if (extend_token(tok, buf, tok_size) < 0)
return EVENT_NONE;
i = 0;
}
ch = __read_char();
buf[i++] = ch;
}
out:
buf[i] = 0;
if (extend_token(tok, buf, tok_size + i + 1) < 0)
return EVENT_NONE;
if (type == EVENT_ITEM) {
/*
* Older versions of the kernel has a bug that
* creates invalid symbols and will break the mac80211
* parsing. This is a work around to that bug.
*
* See Linux kernel commit:
* 811cb50baf63461ce0bdb234927046131fc7fa8b
*/
if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
free(*tok);
*tok = NULL;
return force_token("\"\%s\" ", tok);
} else if (strcmp(*tok, "STA_PR_FMT") == 0) {
free(*tok);
*tok = NULL;
return force_token("\" sta:%pM\" ", tok);
} else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
free(*tok);
*tok = NULL;
return force_token("\" vif:%p(%d)\" ", tok);
}
}
return type;
}
static enum event_type force_token(const char *str, char **tok)
{
const char *save_input_buf;
unsigned long long save_input_buf_ptr;
unsigned long long save_input_buf_siz;
enum event_type type;
/* save off the current input pointers */
save_input_buf = input_buf;
save_input_buf_ptr = input_buf_ptr;
save_input_buf_siz = input_buf_siz;
init_input_buf(str, strlen(str));
type = __read_token(tok);
/* reset back to original token */
input_buf = save_input_buf;
input_buf_ptr = save_input_buf_ptr;
input_buf_siz = save_input_buf_siz;
return type;
}
static void free_token(char *tok)
{
if (tok)
free(tok);
}
static enum event_type read_token(char **tok)
{
enum event_type type;
for (;;) {
type = __read_token(tok);
if (type != EVENT_SPACE)
return type;
free_token(*tok);
}
/* not reached */
*tok = NULL;
return EVENT_NONE;
}
/**
* pevent_read_token - access to utilites to use the pevent parser
* @tok: The token to return
*
* This will parse tokens from the string given by
* pevent_init_data().
*
* Returns the token type.
*/
enum event_type pevent_read_token(char **tok)
{
return read_token(tok);
}
/**
* pevent_free_token - free a token returned by pevent_read_token
* @token: the token to free
*/
void pevent_free_token(char *token)
{
free_token(token);
}
/* no newline */
static enum event_type read_token_item(char **tok)
{
enum event_type type;
for (;;) {
type = __read_token(tok);
if (type != EVENT_SPACE && type != EVENT_NEWLINE)
return type;
free_token(*tok);
*tok = NULL;
}
/* not reached */
*tok = NULL;
return EVENT_NONE;
}
static int test_type(enum event_type type, enum event_type expect)
{
if (type != expect) {
do_warning("Error: expected type %d but read %d",
expect, type);
return -1;
}
return 0;
}
static int test_type_token(enum event_type type, const char *token,
enum event_type expect, const char *expect_tok)
{
if (type != expect) {
do_warning("Error: expected type %d but read %d",
expect, type);
return -1;
}
if (strcmp(token, expect_tok) != 0) {
do_warning("Error: expected '%s' but read '%s'",
expect_tok, token);
return -1;
}
return 0;
}
static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
{
enum event_type type;
if (newline_ok)
type = read_token(tok);
else
type = read_token_item(tok);
return test_type(type, expect);
}
static int read_expect_type(enum event_type expect, char **tok)
{
return __read_expect_type(expect, tok, 1);
}
static int __read_expected(enum event_type expect, const char *str,
int newline_ok)
{
enum event_type type;
char *token;
int ret;
if (newline_ok)
type = read_token(&token);
else
type = read_token_item(&token);
ret = test_type_token(type, token, expect, str);
free_token(token);
return ret;
}
static int read_expected(enum event_type expect, const char *str)
{
return __read_expected(expect, str, 1);
}
static int read_expected_item(enum event_type expect, const char *str)
{
return __read_expected(expect, str, 0);
}
static char *event_read_name(void)
{
char *token;
if (read_expected(EVENT_ITEM, "name") < 0)
return NULL;
if (read_expected(EVENT_OP, ":") < 0)
return NULL;
if (read_expect_type(EVENT_ITEM, &token) < 0)
goto fail;
return token;
fail:
free_token(token);
return NULL;
}
static int event_read_id(void)
{
char *token;
int id;
if (read_expected_item(EVENT_ITEM, "ID") < 0)
return -1;
if (read_expected(EVENT_OP, ":") < 0)
return -1;
if (read_expect_type(EVENT_ITEM, &token) < 0)
goto fail;
id = strtoul(token, NULL, 0);
free_token(token);
return id;
fail:
free_token(token);
return -1;
}
static int field_is_string(struct format_field *field)
{
if ((field->flags & FIELD_IS_ARRAY) &&
(strstr(field->type, "char") || strstr(field->type, "u8") ||
strstr(field->type, "s8")))
return 1;
return 0;
}
static int field_is_dynamic(struct format_field *field)
{
if (strncmp(field->type, "__data_loc", 10) == 0)
return 1;
return 0;
}
static int field_is_long(struct format_field *field)
{
/* includes long long */
if (strstr(field->type, "long"))
return 1;
return 0;
}
static unsigned int type_size(const char *name)
{
/* This covers all FIELD_IS_STRING types. */
static struct {
const char *type;
unsigned int size;
} table[] = {
{ "u8", 1 },
{ "u16", 2 },
{ "u32", 4 },
{ "u64", 8 },
{ "s8", 1 },
{ "s16", 2 },
{ "s32", 4 },
{ "s64", 8 },
{ "char", 1 },
{ },
};
int i;
for (i = 0; table[i].type; i++) {
if (!strcmp(table[i].type, name))
return table[i].size;
}
return 0;
}
static int event_read_fields(struct event_format *event, struct format_field **fields)
{
struct format_field *field = NULL;
enum event_type type;
char *token;
char *last_token;
int count = 0;
do {
unsigned int size_dynamic = 0;
type = read_token(&token);
if (type == EVENT_NEWLINE) {
free_token(token);
return count;
}
count++;
if (test_type_token(type, token, EVENT_ITEM, "field"))
goto fail;
free_token(token);
type = read_token(&token);
/*
* The ftrace fields may still use the "special" name.
* Just ignore it.
*/
if (event->flags & EVENT_FL_ISFTRACE &&
type == EVENT_ITEM && strcmp(token, "special") == 0) {
free_token(token);
type = read_token(&token);
}
if (test_type_token(type, token, EVENT_OP, ":") < 0)
goto fail;
free_token(token);
if (read_expect_type(EVENT_ITEM, &token) < 0)
goto fail;
last_token = token;
field = calloc(1, sizeof(*field));
if (!field)
goto fail;
field->event = event;
/* read the rest of the type */
for (;;) {
type = read_token(&token);
if (type == EVENT_ITEM ||
(type == EVENT_OP && strcmp(token, "*") == 0) ||
/*
* Some of the ftrace fields are broken and have
* an illegal "." in them.
*/
(event->flags & EVENT_FL_ISFTRACE &&
type == EVENT_OP && strcmp(token, ".") == 0)) {
if (strcmp(token, "*") == 0)
field->flags |= FIELD_IS_POINTER;
if (field->type) {
char *new_type;
new_type = realloc(field->type,
strlen(field->type) +
strlen(last_token) + 2);
if (!new_type) {
free(last_token);
goto fail;
}
field->type = new_type;
strcat(field->type, " ");
strcat(field->type, last_token);
free(last_token);
} else
field->type = last_token;
last_token = token;
continue;
}
break;
}
if (!field->type) {
do_warning_event(event, "%s: no type found", __func__);
goto fail;
}
field->name = last_token;
if (test_type(type, EVENT_OP))
goto fail;
if (strcmp(token, "[") == 0) {
enum event_type last_type = type;
char *brackets = token;
char *new_brackets;
int len;
field->flags |= FIELD_IS_ARRAY;
type = read_token(&token);
if (type == EVENT_ITEM)
field->arraylen = strtoul(token, NULL, 0);
else
field->arraylen = 0;
while (strcmp(token, "]") != 0) {
if (last_type == EVENT_ITEM &&
type == EVENT_ITEM)
len = 2;
else
len = 1;
last_type = type;
new_brackets = realloc(brackets,
strlen(brackets) +
strlen(token) + len);
if (!new_brackets) {
free(brackets);
goto fail;
}
brackets = new_brackets;
if (len == 2)
strcat(brackets, " ");
strcat(brackets, token);
/* We only care about the last token */
field->arraylen = strtoul(token, NULL, 0);
free_token(token);
type = read_token(&token);
if (type == EVENT_NONE) {
do_warning_event(event, "failed to find token");
goto fail;
}
}
free_token(token);
new_brackets = realloc(brackets, strlen(brackets) + 2);
if (!new_brackets) {
free(brackets);
goto fail;
}
brackets = new_brackets;
strcat(brackets, "]");
/* add brackets to type */
type = read_token(&token);
/*
* If the next token is not an OP, then it is of
* the format: type [] item;
*/
if (type == EVENT_ITEM) {
char *new_type;
new_type = realloc(field->type,
strlen(field->type) +
strlen(field->name) +
strlen(brackets) + 2);
if (!new_type) {
free(brackets);
goto fail;
}
field->type = new_type;
strcat(field->type, " ");
strcat(field->type, field->name);
size_dynamic = type_size(field->name);
free_token(field->name);
strcat(field->type, brackets);
field->name = token;
type = read_token(&token);
} else {
char *new_type;
new_type = realloc(field->type,
strlen(field->type) +
strlen(brackets) + 1);
if (!new_type) {
free(brackets);
goto fail;
}
field->type = new_type;
strcat(field->type, brackets);
}
free(brackets);
}
if (field_is_string(field))
field->flags |= FIELD_IS_STRING;
if (field_is_dynamic(field))
field->flags |= FIELD_IS_DYNAMIC;
if (field_is_long(field))
field->flags |= FIELD_IS_LONG;
if (test_type_token(type, token, EVENT_OP, ";"))
goto fail;
free_token(token);
if (read_expected(EVENT_ITEM, "offset") < 0)
goto fail_expect;
if (read_expected(EVENT_OP, ":") < 0)
goto fail_expect;
if (read_expect_type(EVENT_ITEM, &token))
goto fail;
field->offset = strtoul(token, NULL, 0);
free_token(token);
if (read_expected(EVENT_OP, ";") < 0)
goto fail_expect;
if (read_expected(EVENT_ITEM, "size") < 0)
goto fail_expect;
if (read_expected(EVENT_OP, ":") < 0)
goto fail_expect;
if (read_expect_type(EVENT_ITEM, &token))
goto fail;
field->size = strtoul(token, NULL, 0);
free_token(token);
if (read_expected(EVENT_OP, ";") < 0)
goto fail_expect;
type = read_token(&token);
if (type != EVENT_NEWLINE) {
/* newer versions of the kernel have a "signed" type */
if (test_type_token(type, token, EVENT_ITEM, "signed"))
goto fail;
free_token(token);
if (read_expected(EVENT_OP, ":") < 0)
goto fail_expect;
if (read_expect_type(EVENT_ITEM, &token))
goto fail;
if (strtoul(token, NULL, 0))
field->flags |= FIELD_IS_SIGNED;
free_token(token);
if (read_expected(EVENT_OP, ";") < 0)
goto fail_expect;
if (read_expect_type(EVENT_NEWLINE, &token))
goto fail;
}
free_token(token);
if (field->flags & FIELD_IS_ARRAY) {
if (field->arraylen)
field->elementsize = field->size / field->arraylen;
else if (field->flags & FIELD_IS_DYNAMIC)
field->elementsize = size_dynamic;
else if (field->flags & FIELD_IS_STRING)
field->elementsize = 1;
else if (field->flags & FIELD_IS_LONG)
field->elementsize = event->pevent ?
event->pevent->long_size :
sizeof(long);
} else
field->elementsize = field->size;
*fields = field;
fields = &field->next;
} while (1);
return 0;
fail:
free_token(token);
fail_expect:
if (field) {
free(field->type);
free(field->name);
free(field);
}
return -1;
}
static int event_read_format(struct event_format *event)
{
char *token;
int ret;
if (read_expected_item(EVENT_ITEM, "format") < 0)
return -1;
if (read_expected(EVENT_OP, ":") < 0)
return -1;
if (read_expect_type(EVENT_NEWLINE, &token))
goto fail;
free_token(token);
ret = event_read_fields(event, &event->format.common_fields);
if (ret < 0)
return ret;
event->format.nr_common = ret;
ret = event_read_fields(event, &event->format.fields);
if (ret < 0)
return ret;
event->format.nr_fields = ret;
return 0;
fail:
free_token(token);
return -1;
}
static enum event_type
process_arg_token(struct event_format *event, struct print_arg *arg,
char **tok, enum event_type type);
static enum event_type
process_arg(struct event_format *event, struct print_arg *arg, char **tok)
{
enum event_type type;
char *token;
type = read_token(&token);
*tok = token;
return process_arg_token(event, arg, tok, type);
}
static enum event_type
process_op(struct event_format *event, struct print_arg *arg, char **tok);
/*
* For __print_symbolic() and __print_flags, we need to completely
* evaluate the first argument, which defines what to print next.
*/
static enum event_type
process_field_arg(struct event_format *event, struct print_arg *arg, char **tok)
{
enum event_type type;
type = process_arg(event, arg, tok);
while (type == EVENT_OP) {
type = process_op(event, arg, tok);
}
return type;
}
static enum event_type
process_cond(struct event_format *event, struct print_arg *top, char **tok)
{
struct print_arg *arg, *left, *right;
enum event_type type;
char *token = NULL;
arg = alloc_arg();
left = alloc_arg();
right = alloc_arg();
if (!arg || !left || !right) {
do_warning_event(event, "%s: not enough memory!", __func__);
/* arg will be freed at out_free */
free_arg(left);
free_arg(right);
goto out_free;
}
arg->type = PRINT_OP;
arg->op.left = left;
arg->op.right = right;
*tok = NULL;
type = process_arg(event, left, &token);
again:
/* Handle other operations in the arguments */
if (type == EVENT_OP && strcmp(token, ":") != 0) {
type = process_op(event, left, &token);
goto again;
}
if (test_type_token(type, token, EVENT_OP, ":"))
goto out_free;
arg->op.op = token;
type = process_arg(event, right, &token);
top->op.right = arg;
*tok = token;
return type;
out_free:
/* Top may point to itself */
top->op.right = NULL;
free_token(token);
free_arg(arg);
return EVENT_ERROR;
}
static enum event_type
process_array(struct event_format *event, struct print_arg *top, char **tok)
{
struct print_arg *arg;
enum event_type type;
char *token = NULL;
arg = alloc_arg();
if (!arg) {
do_warning_event(event, "%s: not enough memory!", __func__);
/* '*tok' is set to top->op.op. No need to free. */
*tok = NULL;
return EVENT_ERROR;
}
*tok = NULL;
type = process_arg(event, arg, &token);
if (test_type_token(type, token, EVENT_OP, "]"))
goto out_free;
top->op.right = arg;
free_token(token);
type = read_token_item(&token);
*tok = token;
return type;
out_free:
free_token(token);
free_arg(arg);
return EVENT_ERROR;
}
static int get_op_prio(char *op)
{
if (!op[1]) {
switch (op[0]) {
case '~':
case '!':
return 4;
case '*':
case '/':
case '%':
return 6;
case '+':
case '-':
return 7;
/* '>>' and '<<' are 8 */
case '<':
case '>':
return 9;
/* '==' and '!=' are 10 */
case '&':
return 11;
case '^':
return 12;
case '|':
return 13;
case '?':
return 16;
default:
do_warning("unknown op '%c'", op[0]);
return -1;
}
} else {
if (strcmp(op, "++") == 0 ||
strcmp(op, "--") == 0) {
return 3;
} else if (strcmp(op, ">>") == 0 ||
strcmp(op, "<<") == 0) {
return 8;
} else if (strcmp(op, ">=") == 0 ||
strcmp(op, "<=") == 0) {
return 9;
} else if (strcmp(op, "==") == 0 ||
strcmp(op, "!=") == 0) {
return 10;
} else if (strcmp(op, "&&") == 0) {
return 14;
} else if (strcmp(op, "||") == 0) {
return 15;
} else {
do_warning("unknown op '%s'", op);
return -1;
}
}
}
static int set_op_prio(struct print_arg *arg)
{
/* single ops are the greatest */
if (!arg->op.left || arg->op.left->type == PRINT_NULL)
arg->op.prio = 0;
else
arg->op.prio = get_op_prio(arg->op.op);
return arg->op.prio;
}
/* Note, *tok does not get freed, but will most likely be saved */
static enum event_type
process_op(struct event_format *event, struct print_arg *arg, char **tok)
{
struct print_arg *left, *right = NULL;
enum event_type type;
char *token;
/* the op is passed in via tok */
token = *tok;
if (arg->type == PRINT_OP && !arg->op.left) {
/* handle single op */
if (token[1]) {
do_warning_event(event, "bad op token %s", token);
goto out_free;
}
switch (token[0]) {
case '~':
case '!':
case '+':
case '-':
break;
default:
do_warning_event(event, "bad op token %s", token);
goto out_free;
}
/* make an empty left */
left = alloc_arg();
if (!left)
goto out_warn_free;
left->type = PRINT_NULL;
arg->op.left = left;
right = alloc_arg();
if (!right)
goto out_warn_free;
arg->op.right = right;
/* do not free the token, it belongs to an op */
*tok = NULL;
type = process_arg(event, right, tok);
} else if (strcmp(token, "?") == 0) {
left = alloc_arg();
if (!left)
goto out_warn_free;
/* copy the top arg to the left */
*left = *arg;
arg->type = PRINT_OP;
arg->op.op = token;
arg->op.left = left;
arg->op.prio = 0;
/* it will set arg->op.right */
type = process_cond(event, arg, tok);
} else if (strcmp(token, ">>") == 0 ||
strcmp(token, "<<") == 0 ||
strcmp(token, "&") == 0 ||
strcmp(token, "|") == 0 ||
strcmp(token, "&&") == 0 ||
strcmp(token, "||") == 0 ||
strcmp(token, "-") == 0 ||
strcmp(token, "+") == 0 ||
strcmp(token, "*") == 0 ||
strcmp(token, "^") == 0 ||
strcmp(token, "/") == 0 ||
strcmp(token, "<") == 0 ||
strcmp(token, ">") == 0 ||
strcmp(token, "<=") == 0 ||
strcmp(token, ">=") == 0 ||
strcmp(token, "==") == 0 ||
strcmp(token, "!=") == 0) {
left = alloc_arg();
if (!left)
goto out_warn_free;
/* copy the top arg to the left */
*left = *arg;
arg->type = PRINT_OP;
arg->op.op = token;
arg->op.left = left;
arg->op.right = NULL;
if (set_op_prio(arg) == -1) {
event->flags |= EVENT_FL_FAILED;
/* arg->op.op (= token) will be freed at out_free */
arg->op.op = NULL;
goto out_free;
}
type = read_token_item(&token);
*tok = token;
/* could just be a type pointer */
if ((strcmp(arg->op.op, "*") == 0) &&
type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
char *new_atom;
if (left->type != PRINT_ATOM) {
do_warning_event(event, "bad pointer type");
goto out_free;
}
new_atom = realloc(left->atom.atom,
strlen(left->atom.atom) + 3);
if (!new_atom)
goto out_warn_free;
left->atom.atom = new_atom;
strcat(left->atom.atom, " *");
free(arg->op.op);
*arg = *left;
free(left);
return type;
}
right = alloc_arg();
if (!right)
goto out_warn_free;
type = process_arg_token(event, right, tok, type);
arg->op.right = right;
} else if (strcmp(token, "[") == 0) {
left = alloc_arg();
if (!left)
goto out_warn_free;
*left = *arg;
arg->type = PRINT_OP;
arg->op.op = token;
arg->op.left = left;
arg->op.prio = 0;
/* it will set arg->op.right */
type = process_array(event, arg, tok);
} else {
do_warning_event(event, "unknown op '%s'", token);
event->flags |= EVENT_FL_FAILED;
/* the arg is now the left side */
goto out_free;
}
if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
int prio;
/* higher prios need to be closer to the root */
prio = get_op_prio(*tok);
if (prio > arg->op.prio)
return process_op(event, arg, tok);
return process_op(event, right, tok);
}
return type;
out_warn_free:
do_warning_event(event, "%s: not enough memory!", __func__);
out_free:
free_token(token);
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_entry(struct event_format *event __maybe_unused, struct print_arg *arg,
char **tok)
{
enum event_type type;
char *field;
char *token;
if (read_expected(EVENT_OP, "->") < 0)
goto out_err;
if (read_expect_type(EVENT_ITEM, &token) < 0)
goto out_free;
field = token;
arg->type = PRINT_FIELD;
arg->field.name = field;
if (is_flag_field) {
arg->field.field = pevent_find_any_field(event, arg->field.name);
arg->field.field->flags |= FIELD_IS_FLAG;
is_flag_field = 0;
} else if (is_symbolic_field) {
arg->field.field = pevent_find_any_field(event, arg->field.name);
arg->field.field->flags |= FIELD_IS_SYMBOLIC;
is_symbolic_field = 0;
}
type = read_token(&token);
*tok = token;
return type;
out_free:
free_token(token);
out_err:
*tok = NULL;
return EVENT_ERROR;
}
static char *arg_eval (struct print_arg *arg);
static unsigned long long
eval_type_str(unsigned long long val, const char *type, int pointer)
{
int sign = 0;
char *ref;
int len;
len = strlen(type);
if (pointer) {
if (type[len-1] != '*') {
do_warning("pointer expected with non pointer type");
return val;
}
ref = malloc(len);
if (!ref) {
do_warning("%s: not enough memory!", __func__);
return val;
}
memcpy(ref, type, len);
/* chop off the " *" */
ref[len - 2] = 0;
val = eval_type_str(val, ref, 0);
free(ref);
return val;
}
/* check if this is a pointer */
if (type[len - 1] == '*')
return val;
/* Try to figure out the arg size*/
if (strncmp(type, "struct", 6) == 0)
/* all bets off */
return val;
if (strcmp(type, "u8") == 0)
return val & 0xff;
if (strcmp(type, "u16") == 0)
return val & 0xffff;
if (strcmp(type, "u32") == 0)
return val & 0xffffffff;
if (strcmp(type, "u64") == 0 ||
strcmp(type, "s64"))
return val;
if (strcmp(type, "s8") == 0)
return (unsigned long long)(char)val & 0xff;
if (strcmp(type, "s16") == 0)
return (unsigned long long)(short)val & 0xffff;
if (strcmp(type, "s32") == 0)
return (unsigned long long)(int)val & 0xffffffff;
if (strncmp(type, "unsigned ", 9) == 0) {
sign = 0;
type += 9;
}
if (strcmp(type, "char") == 0) {
if (sign)
return (unsigned long long)(char)val & 0xff;
else
return val & 0xff;
}
if (strcmp(type, "short") == 0) {
if (sign)
return (unsigned long long)(short)val & 0xffff;
else
return val & 0xffff;
}
if (strcmp(type, "int") == 0) {
if (sign)
return (unsigned long long)(int)val & 0xffffffff;
else
return val & 0xffffffff;
}
return val;
}
/*
* Try to figure out the type.
*/
static unsigned long long
eval_type(unsigned long long val, struct print_arg *arg, int pointer)
{
if (arg->type != PRINT_TYPE) {
do_warning("expected type argument");
return 0;
}
return eval_type_str(val, arg->typecast.type, pointer);
}
static int arg_num_eval(struct print_arg *arg, long long *val)
{
long long left, right;
int ret = 1;
switch (arg->type) {
case PRINT_ATOM:
*val = strtoll(arg->atom.atom, NULL, 0);
break;
case PRINT_TYPE:
ret = arg_num_eval(arg->typecast.item, val);
if (!ret)
break;
*val = eval_type(*val, arg, 0);
break;
case PRINT_OP:
switch (arg->op.op[0]) {
case '|':
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
if (arg->op.op[1])
*val = left || right;
else
*val = left | right;
break;
case '&':
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
if (arg->op.op[1])
*val = left && right;
else
*val = left & right;
break;
case '<':
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
switch (arg->op.op[1]) {
case 0:
*val = left < right;
break;
case '<':
*val = left << right;
break;
case '=':
*val = left <= right;
break;
default:
do_warning("unknown op '%s'", arg->op.op);
ret = 0;
}
break;
case '>':
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
switch (arg->op.op[1]) {
case 0:
*val = left > right;
break;
case '>':
*val = left >> right;
break;
case '=':
*val = left >= right;
break;
default:
do_warning("unknown op '%s'", arg->op.op);
ret = 0;
}
break;
case '=':
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
if (arg->op.op[1] != '=') {
do_warning("unknown op '%s'", arg->op.op);
ret = 0;
} else
*val = left == right;
break;
case '!':
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
switch (arg->op.op[1]) {
case '=':
*val = left != right;
break;
default:
do_warning("unknown op '%s'", arg->op.op);
ret = 0;
}
break;
case '-':
/* check for negative */
if (arg->op.left->type == PRINT_NULL)
left = 0;
else
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
*val = left - right;
break;
case '+':
if (arg->op.left->type == PRINT_NULL)
left = 0;
else
ret = arg_num_eval(arg->op.left, &left);
if (!ret)
break;
ret = arg_num_eval(arg->op.right, &right);
if (!ret)
break;
*val = left + right;
break;
default:
do_warning("unknown op '%s'", arg->op.op);
ret = 0;
}
break;
case PRINT_NULL:
case PRINT_FIELD ... PRINT_SYMBOL:
case PRINT_STRING:
case PRINT_BSTRING:
default:
do_warning("invalid eval type %d", arg->type);
ret = 0;
}
return ret;
}
static char *arg_eval (struct print_arg *arg)
{
long long val;
static char buf[20];
switch (arg->type) {
case PRINT_ATOM:
return arg->atom.atom;
case PRINT_TYPE:
return arg_eval(arg->typecast.item);
case PRINT_OP:
if (!arg_num_eval(arg, &val))
break;
sprintf(buf, "%lld", val);
return buf;
case PRINT_NULL:
case PRINT_FIELD ... PRINT_SYMBOL:
case PRINT_STRING:
case PRINT_BSTRING:
default:
do_warning("invalid eval type %d", arg->type);
break;
}
return NULL;
}
static enum event_type
process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
{
enum event_type type;
struct print_arg *arg = NULL;
struct print_flag_sym *field;
char *token = *tok;
char *value;
do {
free_token(token);
type = read_token_item(&token);
if (test_type_token(type, token, EVENT_OP, "{"))
break;
arg = alloc_arg();
if (!arg)
goto out_free;
free_token(token);
type = process_arg(event, arg, &token);
if (type == EVENT_OP)
type = process_op(event, arg, &token);
if (type == EVENT_ERROR)
goto out_free;
if (test_type_token(type, token, EVENT_DELIM, ","))
goto out_free;
field = calloc(1, sizeof(*field));
if (!field)
goto out_free;
value = arg_eval(arg);
if (value == NULL)
goto out_free_field;
field->value = strdup(value);
if (field->value == NULL)
goto out_free_field;
free_arg(arg);
arg = alloc_arg();
if (!arg)
goto out_free;
free_token(token);
type = process_arg(event, arg, &token);
if (test_type_token(type, token, EVENT_OP, "}"))
goto out_free_field;
value = arg_eval(arg);
if (value == NULL)
goto out_free_field;
field->str = strdup(value);
if (field->str == NULL)
goto out_free_field;
free_arg(arg);
arg = NULL;
*list = field;
list = &field->next;
free_token(token);
type = read_token_item(&token);
} while (type == EVENT_DELIM && strcmp(token, ",") == 0);
*tok = token;
return type;
out_free_field:
free_flag_sym(field);
out_free:
free_arg(arg);
free_token(token);
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_flags(struct event_format *event, struct print_arg *arg, char **tok)
{
struct print_arg *field;
enum event_type type;
char *token = NULL;
memset(arg, 0, sizeof(*arg));
arg->type = PRINT_FLAGS;
field = alloc_arg();
if (!field) {
do_warning_event(event, "%s: not enough memory!", __func__);
goto out_free;
}
type = process_field_arg(event, field, &token);
/* Handle operations in the first argument */
while (type == EVENT_OP)
type = process_op(event, field, &token);
if (test_type_token(type, token, EVENT_DELIM, ","))
goto out_free_field;
free_token(token);
arg->flags.field = field;
type = read_token_item(&token);
if (event_item_type(type)) {
arg->flags.delim = token;
type = read_token_item(&token);
}
if (test_type_token(type, token, EVENT_DELIM, ","))
goto out_free;
type = process_fields(event, &arg->flags.flags, &token);
if (test_type_token(type, token, EVENT_DELIM, ")"))
goto out_free;
free_token(token);
type = read_token_item(tok);
return type;
out_free_field:
free_arg(field);
out_free:
free_token(token);
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
{
struct print_arg *field;
enum event_type type;
char *token = NULL;
memset(arg, 0, sizeof(*arg));
arg->type = PRINT_SYMBOL;
field = alloc_arg();
if (!field) {
do_warning_event(event, "%s: not enough memory!", __func__);
goto out_free;
}
type = process_field_arg(event, field, &token);
if (test_type_token(type, token, EVENT_DELIM, ","))
goto out_free_field;
arg->symbol.field = field;
type = process_fields(event, &arg->symbol.symbols, &token);
if (test_type_token(type, token, EVENT_DELIM, ")"))
goto out_free;
free_token(token);
type = read_token_item(tok);
return type;
out_free_field:
free_arg(field);
out_free:
free_token(token);
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_hex(struct event_format *event, struct print_arg *arg, char **tok)
{
struct print_arg *field;
enum event_type type;
char *token = NULL;
memset(arg, 0, sizeof(*arg));
arg->type = PRINT_HEX;
field = alloc_arg();
if (!field) {
do_warning_event(event, "%s: not enough memory!", __func__);
goto out_free;
}
type = process_arg(event, field, &token);
if (test_type_token(type, token, EVENT_DELIM, ","))
goto out_free;
arg->hex.field = field;
free_token(token);
field = alloc_arg();
if (!field) {
do_warning_event(event, "%s: not enough memory!", __func__);
*tok = NULL;
return EVENT_ERROR;
}
type = process_arg(event, field, &token);
if (test_type_token(type, token, EVENT_DELIM, ")"))
goto out_free;
arg->hex.size = field;
free_token(token);
type = read_token_item(tok);
return type;
out_free:
free_arg(field);
free_token(token);
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
{
struct format_field *field;
enum event_type type;
char *token;
memset(arg, 0, sizeof(*arg));
arg->type = PRINT_DYNAMIC_ARRAY;
/*
* The item within the parenthesis is another field that holds
* the index into where the array starts.
*/
type = read_token(&token);
*tok = token;
if (type != EVENT_ITEM)
goto out_free;
/* Find the field */
field = pevent_find_field(event, token);
if (!field)
goto out_free;
arg->dynarray.field = field;
arg->dynarray.index = 0;
if (read_expected(EVENT_DELIM, ")") < 0)
goto out_free;
free_token(token);
type = read_token_item(&token);
*tok = token;
if (type != EVENT_OP || strcmp(token, "[") != 0)
return type;
free_token(token);
arg = alloc_arg();
if (!arg) {
do_warning_event(event, "%s: not enough memory!", __func__);
*tok = NULL;
return EVENT_ERROR;
}
type = process_arg(event, arg, &token);
if (type == EVENT_ERROR)
goto out_free_arg;
if (!test_type_token(type, token, EVENT_OP, "]"))
goto out_free_arg;
free_token(token);
type = read_token_item(tok);
return type;
out_free_arg:
free_arg(arg);
out_free:
free_token(token);
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_paren(struct event_format *event, struct print_arg *arg, char **tok)
{
struct print_arg *item_arg;
enum event_type type;
char *token;
type = process_arg(event, arg, &token);
if (type == EVENT_ERROR)
goto out_free;
if (type == EVENT_OP)
type = process_op(event, arg, &token);
if (type == EVENT_ERROR)
goto out_free;
if (test_type_token(type, token, EVENT_DELIM, ")"))
goto out_free;
free_token(token);
type = read_token_item(&token);
/*
* If the next token is an item or another open paren, then
* this was a typecast.
*/
if (event_item_type(type) ||
(type == EVENT_DELIM && strcmp(token, "(") == 0)) {
/* make this a typecast and contine */
/* prevous must be an atom */
if (arg->type != PRINT_ATOM) {
do_warning_event(event, "previous needed to be PRINT_ATOM");
goto out_free;
}
item_arg = alloc_arg();
if (!item_arg) {
do_warning_event(event, "%s: not enough memory!",
__func__);
goto out_free;
}
arg->type = PRINT_TYPE;
arg->typecast.type = arg->atom.atom;
arg->typecast.item = item_arg;
type = process_arg_token(event, item_arg, &token, type);
}
*tok = token;
return type;
out_free:
free_token(token);
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_str(struct event_format *event __maybe_unused, struct print_arg *arg,
char **tok)
{
enum event_type type;
char *token;
if (read_expect_type(EVENT_ITEM, &token) < 0)
goto out_free;
arg->type = PRINT_STRING;
arg->string.string = token;
arg->string.offset = -1;
if (read_expected(EVENT_DELIM, ")") < 0)
goto out_err;
type = read_token(&token);
*tok = token;
return type;
out_free:
free_token(token);
out_err:
*tok = NULL;
return EVENT_ERROR;
}
static struct pevent_function_handler *
find_func_handler(struct pevent *pevent, char *func_name)
{
struct pevent_function_handler *func;
if (!pevent)
return NULL;
for (func = pevent->func_handlers; func; func = func->next) {
if (strcmp(func->name, func_name) == 0)
break;
}
return func;
}
static void remove_func_handler(struct pevent *pevent, char *func_name)
{
struct pevent_function_handler *func;
struct pevent_function_handler **next;
next = &pevent->func_handlers;
while ((func = *next)) {
if (strcmp(func->name, func_name) == 0) {
*next = func->next;
free_func_handle(func);
break;
}
next = &func->next;
}
}
static enum event_type
process_func_handler(struct event_format *event, struct pevent_function_handler *func,
struct print_arg *arg, char **tok)
{
struct print_arg **next_arg;
struct print_arg *farg;
enum event_type type;
char *token;
int i;
arg->type = PRINT_FUNC;
arg->func.func = func;
*tok = NULL;
next_arg = &(arg->func.args);
for (i = 0; i < func->nr_args; i++) {
farg = alloc_arg();
if (!farg) {
do_warning_event(event, "%s: not enough memory!",
__func__);
return EVENT_ERROR;
}
type = process_arg(event, farg, &token);
if (i < (func->nr_args - 1)) {
if (type != EVENT_DELIM || strcmp(token, ",") != 0) {
do_warning_event(event,
"Error: function '%s()' expects %d arguments but event %s only uses %d",
func->name, func->nr_args,
event->name, i + 1);
goto err;
}
} else {
if (type != EVENT_DELIM || strcmp(token, ")") != 0) {
do_warning_event(event,
"Error: function '%s()' only expects %d arguments but event %s has more",
func->name, func->nr_args, event->name);
goto err;
}
}
*next_arg = farg;
next_arg = &(farg->next);
free_token(token);
}
type = read_token(&token);
*tok = token;
return type;
err:
free_arg(farg);
free_token(token);
return EVENT_ERROR;
}
static enum event_type
process_function(struct event_format *event, struct print_arg *arg,
char *token, char **tok)
{
struct pevent_function_handler *func;
if (strcmp(token, "__print_flags") == 0) {
free_token(token);
is_flag_field = 1;
return process_flags(event, arg, tok);
}
if (strcmp(token, "__print_symbolic") == 0) {
free_token(token);
is_symbolic_field = 1;
return process_symbols(event, arg, tok);
}
if (strcmp(token, "__print_hex") == 0) {