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sample_prof.c
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sample_prof.c
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_sample_prof.h"
#include "zend_exceptions.h"
#include "sample_prof_arginfo.h"
#include <pthread.h>
#define SAMPLE_PROF_DEFAULT_INTERVAL 1
/* On 64-bit this will give a 16 * 1MB allocation */
#define SAMPLE_PROF_DEFAULT_ALLOC (1 << 20)
ZEND_DECLARE_MODULE_GLOBALS(sample_prof)
static inline zend_bool sample_prof_end(void) {
if (!SAMPLE_PROF_G->enabled) {
return 0;
}
pthread_cancel(SAMPLE_PROF_G->thread_id);
SAMPLE_PROF_G->enabled = 0;
return 1;
}
static void *sample_prof_handler(void *data) {
zend_sample_prof_globals *g = SAMPLE_PROF_G;
#ifdef ZTS
volatile zend_executor_globals *eg = TSRMG_BULK(executor_globals_id, zend_executor_globals *);
#else
volatile zend_executor_globals *eg = &executor_globals;
#endif
retry_now:
while (1) {
volatile zend_execute_data *ex = eg->current_execute_data, *start_ex = ex;
zend_function *func;
const zend_op *opline;
while (1) {
zend_execute_data *prev;
/* We're not executing code right now, try again later */
if (!ex) {
goto retry_later;
}
func = ex->func;
opline = ex->opline;
prev = ex->prev_execute_data;
/* current_execute_data changed in the meantime, reload it */
if (eg->current_execute_data != start_ex) {
goto retry_now;
}
if (func && ZEND_USER_CODE(func->type)) {
break;
}
ex = prev;
}
if (!opline) {
goto retry_later;
}
g->entries[g->entries_num].filename = func->op_array.filename;
g->entries[g->entries_num].lineno = opline->lineno;
if (++g->entries_num == g->entries_allocated) {
/* Doing a realloc within a signal handler is unsafe, end profiling */
g->enabled = 0;
break;
}
retry_later:
usleep(g->interval_usec);
}
pthread_exit(NULL);
}
static void sample_prof_start(long interval_usec, size_t num_entries_alloc) {
zend_sample_prof_globals *g = SAMPLE_PROF_G;
/* Initialize data structures for entries */
if (g->entries) {
efree(g->entries);
}
g->interval_usec = interval_usec;
g->entries_allocated = num_entries_alloc;
g->entries_num = 0;
g->entries = safe_emalloc(g->entries_allocated, sizeof(sample_prof_entry), 0);
/* Register signal handler */
if (pthread_create(&g->thread_id, NULL, sample_prof_handler, NULL)) {
zend_throw_exception(NULL, "Could not register signal handler", 0);
return;
}
g->enabled = 1;
}
PHP_FUNCTION(sample_prof_start) {
zend_long interval_usec = 0;
zend_long num_entries_alloc = 0;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "|ll", &interval_usec, &num_entries_alloc) == FAILURE) {
return;
}
if (interval_usec < 0) {
zend_throw_exception(NULL, "Number of microseconds can't be negative", 0);
return;
} else if (interval_usec == 0) {
interval_usec = SAMPLE_PROF_DEFAULT_INTERVAL;
}
if (num_entries_alloc < 0) {
zend_throw_exception(NULL, "Number of profiling can't be negative", 0);
return;
} else if (num_entries_alloc == 0) {
num_entries_alloc = SAMPLE_PROF_DEFAULT_ALLOC;
}
sample_prof_start(interval_usec, num_entries_alloc);
}
PHP_FUNCTION(sample_prof_end) {
if (zend_parse_parameters_none() == FAILURE) {
return;
}
RETURN_BOOL(sample_prof_end());
}
PHP_FUNCTION(sample_prof_get_data) {
zend_sample_prof_globals *g = SAMPLE_PROF_G;
size_t entry_num;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
array_init(return_value);
for (entry_num = 0; entry_num < g->entries_num; ++entry_num) {
sample_prof_entry *entry = &g->entries[entry_num];
zend_string *filename = entry->filename;
uint32_t lineno = entry->lineno;
zval *lines, *num;
lines = zend_hash_find(Z_ARR_P(return_value), filename);
if (lines == NULL) {
zval lines_zv;
array_init(&lines_zv);
lines = zend_hash_update(Z_ARR_P(return_value), filename, &lines_zv);
}
num = zend_hash_index_find(Z_ARR_P(lines), lineno);
if (num == NULL) {
zval num_zv;
ZVAL_LONG(&num_zv, 0);
num = zend_hash_index_update(Z_ARR_P(lines), lineno, &num_zv);
}
increment_function(num);
}
}
PHP_RINIT_FUNCTION(sample_prof)
{
SAMPLE_PROF_G->enabled = 0;
SAMPLE_PROF_G->entries = NULL;
SAMPLE_PROF_G->entries_num = 0;
return SUCCESS;
}
PHP_RSHUTDOWN_FUNCTION(sample_prof)
{
sample_prof_end();
if (SAMPLE_PROF_G->entries) {
efree(SAMPLE_PROF_G->entries);
}
return SUCCESS;
}
PHP_MINFO_FUNCTION(sample_prof)
{
php_info_print_table_start();
php_info_print_table_header(2, "sample_prof support", "enabled");
php_info_print_table_end();
}
const zend_function_entry sample_prof_functions[] = {
PHP_FE(sample_prof_start, arginfo_sample_prof_start)
PHP_FE(sample_prof_end, arginfo_sample_prof_end)
PHP_FE(sample_prof_get_data, arginfo_sample_prof_get_data)
PHP_FE_END
};
zend_module_entry sample_prof_module_entry = {
STANDARD_MODULE_HEADER,
"sample_prof",
sample_prof_functions,
NULL,
NULL,
PHP_RINIT(sample_prof),
PHP_RSHUTDOWN(sample_prof),
PHP_MINFO(sample_prof),
PHP_SAMPLE_PROF_VERSION,
PHP_MODULE_GLOBALS(sample_prof),
NULL,
NULL,
NULL,
STANDARD_MODULE_PROPERTIES_EX
};
#ifdef COMPILE_DL_SAMPLE_PROF
ZEND_GET_MODULE(sample_prof)
#endif