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329 lines (272 loc) · 9.16 KB
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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Felipe Pena <felipe@php.net> |
| Authors: Joe Watkins <joe.watkins@live.co.uk> |
| Authors: Bob Weinand <bwoebi@php.net> |
+----------------------------------------------------------------------+
*/
#include "zend.h"
#include "phpdbg.h"
#include "phpdbg_utils.h"
#include "phpdbg_frame.h"
#include "phpdbg_list.h"
#include "zend_smart_str.h"
ZEND_EXTERN_MODULE_GLOBALS(phpdbg)
static inline void phpdbg_append_individual_arg(smart_str *s, uint32_t i, zend_function *func, zval *arg) {
const zend_arg_info *arginfo = func->common.arg_info;
char *arg_name = NULL;
if (i) {
smart_str_appends(s, ", ");
}
if (i < func->common.num_args) {
if (arginfo) {
if (func->type == ZEND_INTERNAL_FUNCTION) {
arg_name = (char *) ((zend_internal_arg_info *) &arginfo[i])->name;
} else {
arg_name = ZSTR_VAL(arginfo[i].name);
}
}
smart_str_appends(s, arg_name ? arg_name : "?");
smart_str_appendc(s, '=');
}
{
char *arg_print = phpdbg_short_zval_print(arg, 40);
smart_str_appends(s, arg_print);
efree(arg_print);
}
}
zend_string *phpdbg_compile_stackframe(zend_execute_data *ex) {
smart_str s = {0};
zend_op_array *op_array = &ex->func->op_array;
uint32_t i = 0, first_extra_arg = op_array->num_args, num_args = ZEND_CALL_NUM_ARGS(ex);
zval *p = ZEND_CALL_ARG(ex, 1);
if (op_array->scope) {
smart_str_append(&s, op_array->scope->name);
smart_str_appends(&s, "::");
}
smart_str_append(&s, op_array->function_name);
smart_str_appendc(&s, '(');
if (ZEND_CALL_NUM_ARGS(ex) > first_extra_arg) {
while (i < first_extra_arg) {
phpdbg_append_individual_arg(&s, i, ex->func, p);
p++;
i++;
}
p = ZEND_CALL_VAR_NUM(ex, op_array->last_var + op_array->T);
}
while (i < num_args) {
phpdbg_append_individual_arg(&s, i, ex->func, p);
p++;
i++;
}
smart_str_appendc(&s, ')');
if (ex->func->type == ZEND_USER_FUNCTION) {
smart_str_appends(&s, " at ");
smart_str_append(&s, op_array->filename);
smart_str_appendc(&s, ':');
smart_str_append_unsigned(&s, ex->opline->lineno);
} else {
smart_str_appends(&s, " [internal function]");
}
return s.s;
}
void phpdbg_print_cur_frame_info(void) {
const char *file_chr = zend_get_executed_filename();
zend_string *file = zend_string_init(file_chr, strlen(file_chr), 0);
phpdbg_list_file(file, 3, zend_get_executed_lineno() - 1, zend_get_executed_lineno());
efree(file);
}
void phpdbg_restore_frame(void) /* {{{ */
{
if (PHPDBG_FRAME(num) == 0) {
return;
}
if (PHPDBG_FRAME(generator)) {
if (PHPDBG_FRAME(generator)->execute_data->call) {
PHPDBG_FRAME(generator)->frozen_call_stack = zend_generator_freeze_call_stack(PHPDBG_FRAME(generator)->execute_data);
}
PHPDBG_FRAME(generator) = NULL;
}
PHPDBG_FRAME(num) = 0;
/* move things back */
EG(current_execute_data) = PHPDBG_FRAME(execute_data);
} /* }}} */
void phpdbg_switch_frame(int frame) /* {{{ */
{
zend_execute_data *execute_data = PHPDBG_FRAME(num) ? PHPDBG_FRAME(execute_data) : EG(current_execute_data);
int i = 0;
if (PHPDBG_FRAME(num) == frame) {
phpdbg_notice("Already in frame #%d", frame);
return;
}
phpdbg_try_access {
while (execute_data) {
if (i++ == frame) {
break;
}
do {
execute_data = execute_data->prev_execute_data;
} while (execute_data && execute_data->opline == NULL);
}
} phpdbg_catch_access {
phpdbg_error("Couldn't switch frames, invalid data source");
return;
} phpdbg_end_try_access();
if (execute_data == NULL) {
phpdbg_error("No frame #%d", frame);
return;
}
phpdbg_restore_frame();
if (frame > 0) {
PHPDBG_FRAME(num) = frame;
/* backup things and jump back */
PHPDBG_FRAME(execute_data) = EG(current_execute_data);
EG(current_execute_data) = execute_data;
}
phpdbg_try_access {
zend_string *s = phpdbg_compile_stackframe(EG(current_execute_data));
phpdbg_notice("Switched to frame #%d: %.*s", frame, (int) ZSTR_LEN(s), ZSTR_VAL(s));
zend_string_release(s);
} phpdbg_catch_access {
phpdbg_notice("Switched to frame #%d", frame);
} phpdbg_end_try_access();
phpdbg_print_cur_frame_info();
} /* }}} */
static void phpdbg_dump_prototype(zval *tmp) /* {{{ */
{
zval *funcname, *class, class_zv, *args, *argstmp;
funcname = zend_hash_find(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_FUNCTION));
if ((class = zend_hash_find(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_OBJECT)))) {
ZVAL_NEW_STR(&class_zv, Z_OBJCE_P(class)->name);
class = &class_zv;
} else {
class = zend_hash_find(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_CLASS));
}
if (class) {
zval *type = zend_hash_find(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_TYPE));
phpdbg_out("%s%s%s(", Z_STRVAL_P(class), Z_STRVAL_P(type), Z_STRVAL_P(funcname));
} else {
phpdbg_out("%s(", Z_STRVAL_P(funcname));
}
args = zend_hash_find(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_ARGS));
if (args) {
const zend_function *func = NULL;
const zend_arg_info *arginfo = NULL;
bool is_variadic = 0;
int j = 0, m;
phpdbg_try_access {
/* assuming no autoloader call is necessary, class should have been loaded if it's in backtrace ... */
if ((func = phpdbg_get_function(Z_STRVAL_P(funcname), class ? Z_STRVAL_P(class) : NULL))) {
arginfo = func->common.arg_info;
}
} phpdbg_end_try_access();
m = func ? func->common.num_args : 0;
ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(args), argstmp) {
if (j) {
phpdbg_out(", ");
}
if (m && j < m) {
char *arg_name = NULL;
if (arginfo) {
if (func->type == ZEND_INTERNAL_FUNCTION) {
arg_name = (char *)((zend_internal_arg_info *)&arginfo[j])->name;
} else {
arg_name = ZSTR_VAL(arginfo[j].name);
}
}
if (!is_variadic) {
is_variadic = arginfo ? ZEND_ARG_IS_VARIADIC(&arginfo[j]) : 0;
}
phpdbg_out("%s=%s", arg_name ? arg_name : "?", is_variadic ? "[": "");
}
++j;
{
char *arg_print = phpdbg_short_zval_print(argstmp, 40);
php_printf("%s", arg_print);
efree(arg_print);
}
} ZEND_HASH_FOREACH_END();
if (is_variadic) {
phpdbg_out("]");
}
}
phpdbg_out(")");
}
void phpdbg_dump_backtrace(size_t num) /* {{{ */
{
zval zbacktrace;
zval *tmp;
zend_string *file = NULL;
zend_long line = 0;
int i = 0, limit = num;
PHPDBG_OUTPUT_BACKUP();
if (limit < 0) {
phpdbg_error("Invalid backtrace size %d", limit);
PHPDBG_OUTPUT_BACKUP_RESTORE();
return;
}
phpdbg_try_access {
zend_fetch_debug_backtrace(&zbacktrace, 0, 0, limit);
} phpdbg_catch_access {
phpdbg_error("Couldn't fetch backtrace, invalid data source");
return;
} phpdbg_end_try_access();
line = zend_get_executed_lineno();
file = zend_get_executed_filename_ex();
zval *function_name = NULL;
ZEND_HASH_FOREACH_VAL(Z_ARRVAL(zbacktrace), tmp) {
if (file) { /* userland */
phpdbg_out("frame #%d: ", i);
phpdbg_dump_prototype(tmp);
phpdbg_out(" at %s:"ZEND_LONG_FMT"\n", ZSTR_VAL(file), line);
i++;
} else {
phpdbg_out(" => ");
phpdbg_dump_prototype(tmp);
phpdbg_out(" (internal function)\n");
}
file = zend_hash_find_ptr(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_FILE));
zval *line_zv = zend_hash_find(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_LINE));
if (line_zv) {
line = Z_LVAL_P(line_zv);
}
function_name = zend_hash_find(Z_ARRVAL_P(tmp), ZSTR_KNOWN(ZEND_STR_FUNCTION));
} ZEND_HASH_FOREACH_END();
/* This is possible for fibers' start closure for example, which have a frame that doesn't contain the info
* of which location stated the fiber if that stack frame is already torn down. same behaviour with debug_backtrace(). */
if (file == NULL) {
phpdbg_writeln(" => %s (internal function)", Z_STRVAL_P(function_name));
} else {
phpdbg_writeln("frame #%d: {main} at %s:"ZEND_LONG_FMT, i, ZSTR_VAL(file), line);
}
zval_ptr_dtor_nogc(&zbacktrace);
PHPDBG_OUTPUT_BACKUP_RESTORE();
} /* }}} */
void phpdbg_open_generator_frame(zend_generator *gen) {
zend_string *s;
if (EG(current_execute_data) == gen->execute_data) {
return;
}
phpdbg_restore_frame();
PHPDBG_FRAME(num) = -1;
PHPDBG_FRAME(generator) = gen;
EG(current_execute_data) = gen->execute_data;
if (gen->frozen_call_stack) {
zend_generator_restore_call_stack(gen);
}
gen->execute_data->prev_execute_data = NULL;
s = phpdbg_compile_stackframe(EG(current_execute_data));
phpdbg_notice("Switched to generator with handle #%d: %.*s", gen->std.handle, (int) ZSTR_LEN(s), ZSTR_VAL(s));
zend_string_release(s);
phpdbg_print_cur_frame_info();
}
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