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filter.c
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#include <fnmatch.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/utsname.h>
/* This should be defined before #include "utils.h" */
#define PR_FMT "filter"
#define PR_DOMAIN DBG_FILTER
#include "libmcount/mcount.h"
#include "uftrace.h"
#include "utils/dwarf.h"
#include "utils/filter.h"
#include "utils/list.h"
#include "utils/rbtree.h"
#include "utils/symbol.h"
#include "utils/utils.h"
static void snprintf_trigger_read(char *buf, size_t len, enum trigger_read_type type)
{
buf[0] = '\0';
if (type == TRIGGER_READ_NONE)
snprintf(buf, len, "none");
if (type & TRIGGER_READ_PROC_STATM)
snprintf(buf, len, "%s%s", buf[0] ? "|" : "", "proc/statm");
if (type & TRIGGER_READ_PAGE_FAULT)
snprintf(buf, len, "%s%s", buf[0] ? "|" : "", "page-fault");
if (type & TRIGGER_READ_PMU_CYCLE)
snprintf(buf, len, "%s%s", buf[0] ? "|" : "", "pmu-cycle");
if (type & TRIGGER_READ_PMU_CACHE)
snprintf(buf, len, "%s%s", buf[0] ? "|" : "", "pmu-cache");
if (type & TRIGGER_READ_PMU_BRANCH)
snprintf(buf, len, "%s%s", buf[0] ? "|" : "", "pmu-branch");
}
static void print_trigger(struct uftrace_trigger *tr)
{
if (tr->flags & TRIGGER_FL_CLEAR)
pr_dbg("\ttriggers: clear=%#x\n", tr->clear_flags);
if (tr->flags & TRIGGER_FL_DEPTH)
pr_dbg("\ttrigger: depth %d\n", tr->depth);
if (tr->flags & TRIGGER_FL_FILTER) {
if (tr->fmode == FILTER_MODE_IN)
pr_dbg("\ttrigger: filter IN\n");
else if (tr->fmode == FILTER_MODE_OUT)
pr_dbg("\ttrigger: filter OUT\n");
}
if (tr->flags & TRIGGER_FL_LOC) {
if (tr->lmode == FILTER_MODE_IN)
pr_dbg("\ttrigger: location filter IN\n");
else
pr_dbg("\ttrigger: location filter OUT\n");
}
if (tr->flags & TRIGGER_FL_BACKTRACE)
pr_dbg("\ttrigger: backtrace\n");
if (tr->flags & TRIGGER_FL_TRACE)
pr_dbg("\ttrigger: trace\n");
if (tr->flags & TRIGGER_FL_TRACE_ON)
pr_dbg("\ttrigger: trace_on\n");
if (tr->flags & TRIGGER_FL_TRACE_OFF)
pr_dbg("\ttrigger: trace_off\n");
if (tr->flags & TRIGGER_FL_RECOVER)
pr_dbg("\ttrigger: recover\n");
if (tr->flags & TRIGGER_FL_FINISH)
pr_dbg("\ttrigger: finish\n");
if (tr->flags & TRIGGER_FL_ARGUMENT) {
struct uftrace_arg_spec *arg;
pr_dbg("\ttrigger: argument\n");
list_for_each_entry(arg, tr->pargs, list) {
if (arg->idx == RETVAL_IDX)
continue;
pr_dbg("\t\t arg%d: %c%d\n", arg->idx, ARG_SPEC_CHARS[arg->fmt],
arg->size * 8);
}
}
if (tr->flags & TRIGGER_FL_RETVAL) {
struct uftrace_arg_spec *arg;
pr_dbg("\ttrigger: return value\n");
list_for_each_entry(arg, tr->pargs, list) {
if (arg->idx != RETVAL_IDX)
continue;
pr_dbg("\t\t retval%d: %c%d\n", arg->idx, ARG_SPEC_CHARS[arg->fmt],
arg->size * 8);
}
}
if (tr->flags & TRIGGER_FL_COLOR)
pr_dbg("\ttrigger: color '%c'\n", tr->color);
if (tr->flags & TRIGGER_FL_TIME_FILTER)
pr_dbg("\ttrigger: time filter %" PRIu64 "\n", tr->time);
if (tr->flags & TRIGGER_FL_CALLER)
pr_dbg("\ttrigger: caller filter\n");
if (tr->flags & TRIGGER_FL_SIZE_FILTER)
pr_dbg("\ttrigger: size filter %u\n", tr->size);
if (tr->flags & TRIGGER_FL_READ) {
char buf[1024];
snprintf_trigger_read(buf, sizeof(buf), tr->read);
pr_dbg("\ttrigger: read (%s)\n", buf);
}
}
/**
* uftrace_count_filter - count matching filters in @root
* @root - root of rbtree which has filters
* @flag - filter flag to match
*/
int uftrace_count_filter(struct rb_root *root, unsigned long flag)
{
struct rb_node *entry;
struct uftrace_filter *iter;
int count = 0;
entry = rb_first(root);
while (entry) {
iter = rb_entry(entry, struct uftrace_filter, node);
if (iter->trigger.flags & flag)
count++;
entry = rb_next(entry);
}
return count;
}
static bool match_ip(struct uftrace_filter *filter, uint64_t addr)
{
return filter->start <= addr && addr < filter->end;
}
/**
* uftrace_match_filter - try to match @ip with filters in @root
* @addr - instruction address to match
* @root - root of rbtree which has filters
* @tr - trigger data
*/
struct uftrace_filter *uftrace_match_filter(uint64_t addr, struct rb_root *root,
struct uftrace_trigger *tr)
{
struct rb_node *parent = NULL;
struct rb_node **p = &root->rb_node;
struct uftrace_filter *iter;
while (*p) {
parent = *p;
iter = rb_entry(parent, struct uftrace_filter, node);
if (match_ip(iter, addr)) {
*tr = iter->trigger;
pr_dbg2("filter match: %s\n", iter->name);
if (dbg_domain[DBG_FILTER] >= 3)
print_trigger(tr);
return iter;
}
if (iter->start > addr)
p = &parent->rb_left;
else
p = &parent->rb_right;
}
return NULL;
}
static void add_arg_spec(struct list_head *arg_list, struct uftrace_arg_spec *arg, bool exact_match)
{
bool found = false;
struct uftrace_arg_spec *oarg, *narg;
list_for_each_entry(oarg, arg_list, list) {
if (arg->type != oarg->type)
continue;
switch (arg->type) {
case ARG_TYPE_INDEX:
case ARG_TYPE_FLOAT:
if (arg->idx == oarg->idx)
found = true;
break;
case ARG_TYPE_REG:
if (arg->reg_idx == oarg->reg_idx)
found = true;
break;
case ARG_TYPE_STACK:
if (arg->stack_ofs == oarg->stack_ofs)
found = true;
break;
}
if (found)
break;
}
if (found) {
/* do not overwrite exact match by regex match */
if (exact_match || !oarg->exact) {
free(oarg->type_name);
oarg->type_name = NULL;
oarg->fmt = arg->fmt;
oarg->size = arg->size;
oarg->exact = exact_match;
oarg->type = arg->type;
oarg->reg_idx = arg->reg_idx;
oarg->struct_reg_cnt = arg->struct_reg_cnt;
if (arg->type_name)
oarg->type_name = xstrdup(arg->type_name);
if (arg->struct_reg_cnt) {
memcpy(oarg->struct_regs, arg->struct_regs,
sizeof(arg->struct_regs));
}
}
}
else {
narg = xmalloc(sizeof(*narg));
narg->idx = arg->idx;
narg->fmt = arg->fmt;
narg->size = arg->size;
narg->exact = exact_match;
narg->type = arg->type;
narg->reg_idx = arg->reg_idx;
narg->struct_reg_cnt = arg->struct_reg_cnt;
if (arg->type_name)
narg->type_name = xstrdup(arg->type_name);
else
narg->type_name = NULL;
if (arg->struct_reg_cnt) {
memcpy(narg->struct_regs, arg->struct_regs, sizeof(arg->struct_regs));
}
list_add_tail(&narg->list, &oarg->list);
}
}
/**
* update_trigger - update the trigger flags and related filter data
* @filter - trigger tree entry holding filter parameters
* @tr - trigger flags to apply
* @exact_match - if symbol is exact or regex match (exact match has precedence)
*/
void update_trigger(struct uftrace_filter *filter, struct uftrace_trigger *tr, bool exact_match)
{
filter->trigger.flags |= tr->flags;
if (tr->flags & TRIGGER_FL_CLEAR) {
filter->trigger.flags &= ~tr->clear_flags;
if (tr->clear_flags & TRIGGER_FL_FILTER)
tr->fmode = filter->trigger.fmode; /* read from tree before deleting */
}
if (tr->flags & TRIGGER_FL_DEPTH)
filter->trigger.depth = tr->depth;
if (tr->flags & TRIGGER_FL_FILTER)
filter->trigger.fmode = tr->fmode;
if (tr->flags & TRIGGER_FL_LOC)
filter->trigger.lmode = tr->lmode;
if (tr->flags & TRIGGER_FL_TRACE_ON)
filter->trigger.flags &= ~TRIGGER_FL_TRACE_OFF;
if (tr->flags & TRIGGER_FL_TRACE_OFF)
filter->trigger.flags &= ~TRIGGER_FL_TRACE_ON;
if (tr->flags & (TRIGGER_FL_ARGUMENT | TRIGGER_FL_RETVAL)) {
struct uftrace_arg_spec *arg;
list_for_each_entry(arg, tr->pargs, list)
add_arg_spec(&filter->args, arg, exact_match);
}
if (tr->flags & TRIGGER_FL_COLOR)
filter->trigger.color = tr->color;
if (tr->flags & TRIGGER_FL_TIME_FILTER)
filter->trigger.time = tr->time;
if (tr->flags & TRIGGER_FL_READ)
filter->trigger.read |= tr->read;
if (tr->flags & TRIGGER_FL_SIZE_FILTER)
filter->trigger.size = tr->size;
}
/**
* prune_void_filter - remove filters without trigger flags from the tree
* @node - filter node to check
* @root - root of the rbtree
*/
static void prune_void_filter(struct rb_node *node, struct rb_root *root)
{
struct uftrace_filter *iter = rb_entry(node, struct uftrace_filter, node);
if (!iter->trigger.flags) {
rb_erase(node, root);
pr_dbg3("prune void filter %s\n", iter->name);
}
}
/**
* update_filter - add, change or remove registered filter
* @root - registered filters RB tree
* @filter - filter tree node to update
* @tr - trigger flags and data to apply
* @exact_match - if symbol name is exact or regex match (exact precedes)
* @dinfo - debug information
* @return - status: 1 when update is made, 0 otherwise
*/
static int update_filter(struct rb_root *root, struct uftrace_filter *filter,
struct uftrace_trigger *tr, struct uftrace_mmap *map, bool exact_match,
struct uftrace_dbg_info *dinfo, struct uftrace_filter_setting *setting)
{
struct rb_node *parent = NULL;
struct rb_node **p = &root->rb_node;
struct uftrace_filter *iter, *new;
struct uftrace_filter *auto_arg = NULL;
struct uftrace_filter *auto_ret = NULL;
unsigned long orig_flags = tr->flags;
if ((tr->flags & TRIGGER_FL_ARGUMENT) && list_empty(tr->pargs)) {
auto_arg = find_auto_argspec(filter, tr, dinfo, setting);
if (auto_arg == NULL)
tr->flags &= ~TRIGGER_FL_ARGUMENT;
}
if ((tr->flags & TRIGGER_FL_RETVAL) && list_empty(tr->pargs)) {
auto_ret = find_auto_retspec(filter, tr, dinfo, setting);
if (auto_ret == NULL)
tr->flags &= ~TRIGGER_FL_RETVAL;
}
/* remove unnecessary filters might be set by --auto-args */
if (tr->flags == TRIGGER_FL_AUTO_ARGS) {
/* restored for regex filter */
tr->flags = orig_flags;
return 0;
}
pr_dbg2("add filter for %s (flags = %x)\n", filter->name, tr->flags);
if (dbg_domain[DBG_FILTER] >= 3)
print_trigger(tr);
filter->start += map->start;
filter->end += map->start;
while (*p) {
parent = *p;
iter = rb_entry(parent, struct uftrace_filter, node);
if (iter->start == filter->start) {
unsigned long args_flags = tr->flags;
args_flags &= ~TRIGGER_FL_AUTO_ARGS;
/* ignore auto-args if it already has argspec */
if ((tr->flags & TRIGGER_FL_AUTO_ARGS) &&
(iter->trigger.flags & args_flags)) {
tr->flags = orig_flags;
return 0;
}
update_trigger(iter, tr, exact_match);
if (auto_arg)
update_trigger(iter, &auto_arg->trigger, exact_match);
if (auto_ret)
update_trigger(iter, &auto_ret->trigger, exact_match);
tr->flags = orig_flags;
if (tr->flags & TRIGGER_FL_CLEAR)
prune_void_filter(parent, root);
return 1;
}
if (iter->start > filter->start)
p = &parent->rb_left;
else
p = &parent->rb_right;
}
new = xmalloc(sizeof(*new));
memcpy(new, filter, sizeof(*new));
new->trigger.flags = 0;
new->trigger.read = 0;
INIT_LIST_HEAD(&new->args);
new->trigger.pargs = &new->args;
update_trigger(new, tr, exact_match);
if (auto_arg)
update_trigger(new, &auto_arg->trigger, exact_match);
if (auto_ret)
update_trigger(new, &auto_ret->trigger, exact_match);
tr->flags = orig_flags;
rb_link_node(&new->node, parent, p);
rb_insert_color(&new->node, root);
return 1;
}
struct {
enum uftrace_pattern_type type;
const char *name;
} filter_patterns[] = {
{ PATT_SIMPLE, "simple" },
{ PATT_REGEX, "regex" },
{ PATT_GLOB, "glob" },
};
void init_locfilter_pattern(enum uftrace_pattern_type type, struct uftrace_pattern *p, char *str)
{
char *converted;
if (strpbrk(str, REGEX_CHARS) == NULL) {
/* remove trailing '/' */
if (str[strlen(str) - 1] == '/')
str[strlen(str) - 1] = '\0';
/* remove preceding '/' */
if (str[0] == '/')
str += 1;
xasprintf(&converted, "%s%s%s", "((.*/)*)", str, "($|(/.*))");
p->type = PATT_REGEX;
p->patt = converted;
}
else {
/* remaining PATT_REGEX and PATT_GLOB cases */
p->type = type;
p->patt = xstrdup(str);
}
if (p->type == PATT_REGEX) {
/* to handle full demangled operator new and delete specially */
const char *str_operator = "operator ";
if (!strncmp(p->patt, str_operator, 9)) {
p->type = PATT_SIMPLE;
}
else if (regcomp(&p->re, p->patt, REG_NOSUB | REG_EXTENDED)) {
pr_dbg("regex pattern failed: %s\n", p->patt);
p->type = PATT_SIMPLE;
}
}
}
void init_filter_pattern(enum uftrace_pattern_type type, struct uftrace_pattern *p, char *str)
{
if (strpbrk(str, REGEX_CHARS) == NULL)
type = PATT_SIMPLE;
p->type = type;
p->patt = xstrdup(str);
if (type == PATT_REGEX) {
/* to handle full demangled operator new and delete specially */
const char *str_operator = "operator ";
if (!strncmp(str, str_operator, 9)) {
p->type = PATT_SIMPLE;
}
else if (regcomp(&p->re, str, REG_NOSUB | REG_EXTENDED)) {
pr_dbg("regex pattern failed: %s\n", str);
p->type = PATT_SIMPLE;
}
}
}
bool match_filter_pattern(struct uftrace_pattern *p, char *name)
{
switch (p->type) {
case PATT_SIMPLE:
return !strcmp(p->patt, name);
case PATT_REGEX:
return !regexec(&p->re, name, 0, NULL, 0);
case PATT_GLOB:
return !fnmatch(p->patt, name, 0);
default:
return false;
}
}
bool match_location_filter(struct uftrace_pattern *p, struct uftrace_dbg_info *dinfo,
size_t loc_idx)
{
char *loc;
if (!dinfo || loc_idx >= dinfo->nr_locs || !dinfo->locs[loc_idx].file)
return false;
loc = dinfo->locs[loc_idx].file->name;
return match_filter_pattern(p, loc);
}
void free_filter_pattern(struct uftrace_pattern *p)
{
free(p->patt);
p->patt = NULL;
if (p->type == PATT_REGEX)
regfree(&p->re);
p->type = PATT_NONE;
}
enum uftrace_pattern_type parse_filter_pattern(const char *str)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(filter_patterns); i++) {
if (!strcmp(str, filter_patterns[i].name))
return filter_patterns[i].type;
}
return PATT_NONE;
}
const char *get_filter_pattern(enum uftrace_pattern_type ptype)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(filter_patterns); i++) {
if (filter_patterns[i].type == ptype)
return filter_patterns[i].name;
}
return "none";
}
/* argument_spec = arg1/i32,arg2/x64%reg,arg3%stack+1,... */
static int parse_argument_spec(char *str, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
struct uftrace_arg_spec *arg;
if (!isdigit(str[3])) {
pr_use("skipping invalid argument: %s\n", str);
return -1;
}
arg = parse_argspec(str, setting);
if (arg == NULL)
return -1;
tr->flags |= TRIGGER_FL_ARGUMENT;
list_add_tail(&arg->list, tr->pargs);
return 0;
}
/* argument_spec = retval/i32 or retval/x64 ... */
static int parse_retval_spec(char *str, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
struct uftrace_arg_spec *arg;
arg = parse_argspec(str, setting);
if (arg == NULL)
return -1;
tr->flags |= TRIGGER_FL_RETVAL;
list_add_tail(&arg->list, tr->pargs);
return 0;
}
/* argument_spec = fparg1/32,fparg2/64%stack+1,... */
static int parse_float_argument_spec(char *str, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
struct uftrace_arg_spec *arg;
if (!isdigit(str[5])) {
pr_use("skipping invalid argument: %s\n", str);
return -1;
}
arg = parse_argspec(str, setting);
if (arg == NULL)
return -1;
tr->flags |= TRIGGER_FL_ARGUMENT;
list_add_tail(&arg->list, tr->pargs);
return 0;
}
static int parse_depth_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_DEPTH;
tr->depth = strtoul(action + 6, NULL, 10);
if (tr->depth < 0 || tr->depth > MCOUNT_RSTACK_MAX) {
pr_use("skipping invalid trigger depth: %d\n", tr->depth);
return -1;
}
return 0;
}
static int parse_time_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_TIME_FILTER;
tr->time = parse_time(action + 5, 3);
return 0;
}
static int parse_size_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_SIZE_FILTER;
tr->size = strtoul(action + 5, NULL, 10);
return 0;
}
static int parse_read_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
const char *target = action + 5;
if (!strcmp(target, "proc/statm"))
tr->read |= TRIGGER_READ_PROC_STATM;
if (!strcmp(target, "page-fault"))
tr->read |= TRIGGER_READ_PAGE_FAULT;
if (!strcmp(target, "pmu-cycle"))
tr->read |= TRIGGER_READ_PMU_CYCLE;
if (!strcmp(target, "pmu-cache"))
tr->read |= TRIGGER_READ_PMU_CACHE;
if (!strcmp(target, "pmu-branch"))
tr->read |= TRIGGER_READ_PMU_BRANCH;
/* set READ flag only if valid type set */
if (tr->read)
tr->flags |= TRIGGER_FL_READ;
return 0;
}
static int parse_color_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
const char *color = action + 6;
if (!strcmp(color, "red"))
tr->color = COLOR_CODE_RED;
else if (!strcmp(color, "green"))
tr->color = COLOR_CODE_GREEN;
else if (!strcmp(color, "blue"))
tr->color = COLOR_CODE_BLUE;
else if (!strcmp(color, "yellow"))
tr->color = COLOR_CODE_YELLOW;
else if (!strcmp(color, "magenta"))
tr->color = COLOR_CODE_MAGENTA;
else if (!strcmp(color, "cyan"))
tr->color = COLOR_CODE_CYAN;
else if (!strcmp(color, "bold"))
tr->color = COLOR_CODE_BOLD;
else if (!strcmp(color, "gray"))
tr->color = COLOR_CODE_GRAY;
else {
pr_use("ignoring invalid color: %s\n", color);
return 0;
}
tr->flags |= TRIGGER_FL_COLOR;
return 0;
}
static int parse_trace_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
action += 5;
if (*action == '_' || *action == '-')
action++;
if (*action == '\0')
tr->flags |= TRIGGER_FL_TRACE;
else if (!strcasecmp(action, "on"))
tr->flags |= TRIGGER_FL_TRACE_ON;
else if (!strcasecmp(action, "off"))
tr->flags |= TRIGGER_FL_TRACE_OFF;
else
pr_use("skipping invalid trace action: %s\n", action);
return 0;
}
static int parse_backtrace_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_BACKTRACE;
return 0;
}
static int parse_recover_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_RECOVER;
return 0;
}
static int parse_finish_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_FINISH;
return 0;
}
static int parse_filter_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_FILTER;
tr->fmode = FILTER_MODE_IN;
return 0;
}
static int parse_notrace_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_FILTER;
tr->fmode = FILTER_MODE_OUT;
return 0;
}
static int parse_auto_args_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_ARGUMENT | TRIGGER_FL_RETVAL;
return 0;
}
static int parse_caller_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_CALLER;
return 0;
}
static int parse_hide_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
tr->flags |= TRIGGER_FL_HIDE;
return 0;
}
static int parse_clear_action(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting)
{
struct strv acts = STRV_INIT;
char *pos = NULL;
int j;
tr->flags |= TRIGGER_FL_CLEAR;
if (strlen(action) == 5) {
tr->clear_flags = ~0;
return 0;
}
if (action[5] != '=') {
pr_use("skipping invalid action: %s\n", action);
return -1;
}
/* action = "clear=act1+act2+..." */
pos = action + 6;
strv_split(&acts, pos, "+");
strv_for_each(&acts, pos, j) {
if (!strcmp(pos, "arg") || !strcmp(pos, "fparg"))
tr->clear_flags |= TRIGGER_FL_ARGUMENT;
else if (!strcmp(pos, "retval"))
tr->clear_flags |= TRIGGER_FL_RETVAL;
else if (!strcmp(pos, "filter") || !strcmp(pos, "notrace"))
tr->clear_flags |= TRIGGER_FL_FILTER;
else if (!strcmp(pos, "depth"))
tr->clear_flags |= TRIGGER_FL_DEPTH;
else if (!strcmp(pos, "time"))
tr->clear_flags |= TRIGGER_FL_TIME_FILTER;
else if (!strcmp(pos, "size"))
tr->clear_flags |= TRIGGER_FL_SIZE_FILTER;
else if (!strcmp(pos, "hide"))
tr->clear_flags |= TRIGGER_FL_HIDE;
else if (!strcmp(pos, "trace"))
tr->clear_flags |= TRIGGER_FL_TRACE | TRIGGER_FL_TRACE_ON |
TRIGGER_FL_TRACE_OFF;
else if (!strcmp(pos, "finish"))
tr->clear_flags |= TRIGGER_FL_FINISH;
else if (!strcmp(pos, "read"))
tr->clear_flags |= TRIGGER_FL_READ;
else if (!strcmp(pos, "color"))
tr->clear_flags |= TRIGGER_FL_COLOR;
else if (!strcmp(pos, "backtrace"))
tr->clear_flags |= TRIGGER_FL_BACKTRACE;
else if (!strcmp(pos, "recover"))
tr->clear_flags |= TRIGGER_FL_RECOVER;
else
pr_use("skipping invalid clear argument: %s\n", pos);
}
strv_free(&acts);
return 0;
}
struct trigger_action_parser {
const char *name;
int (*parse)(char *action, struct uftrace_trigger *tr,
struct uftrace_filter_setting *setting);
enum trigger_flag compat_flags; /* flags the action is restricted to */
};
static const struct trigger_action_parser actions[] = {
{
"arg",
parse_argument_spec,
TRIGGER_FL_ARGUMENT,
},
{
"fparg",
parse_float_argument_spec,
TRIGGER_FL_ARGUMENT,
},
{
"retval",
parse_retval_spec,
TRIGGER_FL_RETVAL,
},
{
"filter",
parse_filter_action,
TRIGGER_FL_FILTER,
},
{
"notrace",
parse_notrace_action,
TRIGGER_FL_FILTER,
},
{
"depth=",
parse_depth_action,
TRIGGER_FL_FILTER,
},
{
"time=",
parse_time_action,
TRIGGER_FL_FILTER,
},
{
"size=",
parse_size_action,
TRIGGER_FL_FILTER,
},
{
"caller",
parse_caller_action,
TRIGGER_FL_FILTER,
},
{
"hide",
parse_hide_action,
TRIGGER_FL_FILTER,
},
{
"trace",
parse_trace_action,
TRIGGER_FL_SIGNAL,
},
{
"finish",
parse_finish_action,
TRIGGER_FL_SIGNAL,
},
{
"read=",
parse_read_action,
},
{
"color=",
parse_color_action,
},
{
"backtrace",
parse_backtrace_action,
},
{
"recover",
parse_recover_action,
},
{
"auto-args",
parse_auto_args_action,
},
{
"clear",
parse_clear_action,
TRIGGER_FL_FILTER | TRIGGER_FL_CALLER,
},
};
int setup_trigger_action(char *str, struct uftrace_trigger *tr, char **module,
unsigned long orig_flags, struct uftrace_filter_setting *setting)
{
char *pos = strchr(str, '@');
struct strv acts = STRV_INIT;
int ret = -1;
size_t i;
int j;
if (module != NULL)
*module = NULL;
if (pos == NULL)
return 0;
*pos++ = '\0';
strv_split(&acts, pos, ",");
strv_for_each(&acts, pos, j) {
for (i = 0; i < ARRAY_SIZE(actions); i++) {
const struct trigger_action_parser *action = &actions[i];
if (strncasecmp(pos, action->name, strlen(action->name)))
continue;
if (orig_flags && !(orig_flags & action->compat_flags))
break; /* ignore incompatible actions */
if (action->parse(pos, tr, setting) < 0)
goto out;
break;
}
/* if it's not an action, treat it as a module name */
if (i == ARRAY_SIZE(actions) && module != NULL) {
if (*module)
pr_use("ignoring extra module: %s\n", pos);
else
*module = xstrdup(pos);
}
}
if (tr->flags & TRIGGER_FL_CLEAR) {
if (orig_flags)
/* '@clear' suffix for options other then -T/--trigger */
tr->clear_flags = orig_flags;
else {
/* preserve flag if set and cleared e.g. -T func@act,clear=act applies act */
tr->clear_flags &= ~tr->flags;
}
}
ret = 0;
out:
if (ret < 0 && module != NULL)
free(*module);
strv_free(&acts);
return ret;
}
/**
* update_trigger_entry - match symbol names to update their filter
* @root - RB tree of registered filters
* @patt - matching pattern type
* @tr - trigger data and flags to apply
* @return - status: count of updated filters
*/
static int update_trigger_entry(struct rb_root *root, struct uftrace_pattern *patt,
struct uftrace_trigger *tr, struct uftrace_mmap *map,
struct uftrace_filter_setting *setting)
{
struct uftrace_filter filter;
struct uftrace_symtab *symtab = &map->mod->symtab;
struct uftrace_dbg_info *dinfo = &map->mod->dinfo;
struct uftrace_symbol *sym;
size_t i;
int ret = 0;
for (i = 0; i < symtab->nr_sym; i++) {
sym = &symtab->sym[i];
if (tr->flags == TRIGGER_FL_LOC) {
if (!match_location_filter(patt, dinfo, i))
continue;
}
else {
if (!match_filter_pattern(patt, sym->name))
continue;
}
if (setting->plt_only && sym->type != ST_PLT_FUNC)
continue;
filter.name = sym->name;
filter.start = sym->addr;
filter.end = sym->addr + sym->size;
ret += update_filter(root, &filter, tr, map, patt->type == PATT_SIMPLE, dinfo,
setting);