1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2018 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Felipe Pena <felipe@php.net> |
16 | Authors: Joe Watkins <joe.watkins@live.co.uk> |
17 | Authors: Bob Weinand <bwoebi@php.net> |
18 +----------------------------------------------------------------------+
19 */
20
21 #include "zend.h"
22 #include "phpdbg.h"
23 #include "phpdbg_utils.h"
24 #include "phpdbg_frame.h"
25 #include "phpdbg_list.h"
26 #include "zend_smart_str.h"
27
ZEND_EXTERN_MODULE_GLOBALS(phpdbg)28 ZEND_EXTERN_MODULE_GLOBALS(phpdbg)
29
30 static inline void phpdbg_append_individual_arg(smart_str *s, uint32_t i, zend_function *func, zval *arg) {
31 const zend_arg_info *arginfo = func->common.arg_info;
32 char *arg_name = NULL;
33
34 if (i) {
35 smart_str_appends(s, ", ");
36 }
37 if (i < func->common.num_args) {
38 if (arginfo) {
39 if (func->type == ZEND_INTERNAL_FUNCTION) {
40 arg_name = (char *) ((zend_internal_arg_info *) &arginfo[i])->name;
41 } else {
42 arg_name = ZSTR_VAL(arginfo[i].name);
43 }
44 }
45 smart_str_appends(s, arg_name ? arg_name : "?");
46 smart_str_appendc(s, '=');
47 }
48 {
49 char *arg_print = phpdbg_short_zval_print(arg, 40);
50 smart_str_appends(s, arg_print);
51 efree(arg_print);
52 }
53 }
54
phpdbg_compile_stackframe(zend_execute_data * ex)55 zend_string *phpdbg_compile_stackframe(zend_execute_data *ex) {
56 smart_str s = {0};
57 zend_op_array *op_array = &ex->func->op_array;
58 uint32_t i = 0, first_extra_arg = op_array->num_args, num_args = ZEND_CALL_NUM_ARGS(ex);
59 zval *p = ZEND_CALL_ARG(ex, 1);
60
61 if (op_array->scope) {
62 smart_str_append(&s, op_array->scope->name);
63 smart_str_appends(&s, "::");
64 }
65 smart_str_append(&s, op_array->function_name);
66 smart_str_appendc(&s, '(');
67 if (ZEND_CALL_NUM_ARGS(ex) > first_extra_arg) {
68 while (i < first_extra_arg) {
69 phpdbg_append_individual_arg(&s, i, ex->func, p);
70 p++;
71 i++;
72 }
73 p = ZEND_CALL_VAR_NUM(ex, op_array->last_var + op_array->T);
74 }
75 while (i < num_args) {
76 phpdbg_append_individual_arg(&s, i, ex->func, p);
77 p++;
78 i++;
79 }
80 smart_str_appendc(&s, ')');
81
82 if (ex->func->type == ZEND_USER_FUNCTION) {
83 smart_str_appends(&s, " at ");
84 smart_str_append(&s, op_array->filename);
85 smart_str_appendc(&s, ':');
86 smart_str_append_unsigned(&s, ex->opline->lineno);
87 } else {
88 smart_str_appends(&s, " [internal function]");
89 }
90
91 return s.s;
92 }
93
phpdbg_print_cur_frame_info()94 void phpdbg_print_cur_frame_info() {
95 const char *file_chr = zend_get_executed_filename();
96 zend_string *file = zend_string_init(file_chr, strlen(file_chr), 0);
97
98 phpdbg_list_file(file, 3, zend_get_executed_lineno() - 1, zend_get_executed_lineno());
99 efree(file);
100 }
101
phpdbg_restore_frame(void)102 void phpdbg_restore_frame(void) /* {{{ */
103 {
104 if (PHPDBG_FRAME(num) == 0) {
105 return;
106 }
107
108 if (PHPDBG_FRAME(generator)) {
109 if (PHPDBG_FRAME(generator)->execute_data->call) {
110 PHPDBG_FRAME(generator)->frozen_call_stack = zend_generator_freeze_call_stack(PHPDBG_FRAME(generator)->execute_data);
111 }
112 PHPDBG_FRAME(generator) = NULL;
113 }
114
115 PHPDBG_FRAME(num) = 0;
116
117 /* move things back */
118 EG(current_execute_data) = PHPDBG_FRAME(execute_data);
119 } /* }}} */
120
phpdbg_switch_frame(int frame)121 void phpdbg_switch_frame(int frame) /* {{{ */
122 {
123 zend_execute_data *execute_data = PHPDBG_FRAME(num) ? PHPDBG_FRAME(execute_data) : EG(current_execute_data);
124 int i = 0;
125
126 if (PHPDBG_FRAME(num) == frame) {
127 phpdbg_notice("frame", "id=\"%d\"", "Already in frame #%d", frame);
128 return;
129 }
130
131 phpdbg_try_access {
132 while (execute_data) {
133 if (i++ == frame) {
134 break;
135 }
136
137 do {
138 execute_data = execute_data->prev_execute_data;
139 } while (execute_data && execute_data->opline == NULL);
140 }
141 } phpdbg_catch_access {
142 phpdbg_error("signalsegv", "", "Couldn't switch frames, invalid data source");
143 return;
144 } phpdbg_end_try_access();
145
146 if (execute_data == NULL) {
147 phpdbg_error("frame", "type=\"maxnum\" id=\"%d\"", "No frame #%d", frame);
148 return;
149 }
150
151 phpdbg_restore_frame();
152
153 if (frame > 0) {
154 PHPDBG_FRAME(num) = frame;
155
156 /* backup things and jump back */
157 PHPDBG_FRAME(execute_data) = EG(current_execute_data);
158 EG(current_execute_data) = execute_data;
159 }
160
161 phpdbg_try_access {
162 zend_string *s = phpdbg_compile_stackframe(EG(current_execute_data));
163 phpdbg_notice("frame", "id=\"%d\" frameinfo=\"%.*s\"", "Switched to frame #%d: %.*s", frame, (int) ZSTR_LEN(s), ZSTR_VAL(s));
164 zend_string_release(s);
165 } phpdbg_catch_access {
166 phpdbg_notice("frame", "id=\"%d\"", "Switched to frame #%d", frame);
167 } phpdbg_end_try_access();
168
169 phpdbg_print_cur_frame_info();
170 } /* }}} */
171
phpdbg_dump_prototype(zval * tmp)172 static void phpdbg_dump_prototype(zval *tmp) /* {{{ */
173 {
174 zval *funcname, *class, class_zv, *type, *args, *argstmp;
175
176 funcname = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("function"));
177
178 if ((class = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("object")))) {
179 ZVAL_NEW_STR(&class_zv, Z_OBJCE_P(class)->name);
180 class = &class_zv;
181 } else {
182 class = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("class"));
183 }
184
185 if (class) {
186 type = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("type"));
187 }
188
189 args = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("args"));
190
191 phpdbg_xml(" symbol=\"%s%s%s\"", class ? Z_STRVAL_P(class) : "", class ? Z_STRVAL_P(type) : "", Z_STRVAL_P(funcname));
192
193 if (args) {
194 phpdbg_xml(">");
195 } else {
196 phpdbg_xml(" />");
197 }
198
199 phpdbg_out("%s%s%s(", class ? Z_STRVAL_P(class) : "", class ? Z_STRVAL_P(type) : "", Z_STRVAL_P(funcname));
200
201 if (args) {
202 const zend_function *func = NULL;
203 const zend_arg_info *arginfo = NULL;
204 zend_bool is_variadic = 0;
205 int j = 0, m;
206
207 phpdbg_try_access {
208 /* assuming no autoloader call is necessary, class should have been loaded if it's in backtrace ... */
209 if ((func = phpdbg_get_function(Z_STRVAL_P(funcname), class ? Z_STRVAL_P(class) : NULL))) {
210 arginfo = func->common.arg_info;
211 }
212 } phpdbg_end_try_access();
213
214 m = func ? func->common.num_args : 0;
215
216 ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(args), argstmp) {
217 if (j) {
218 phpdbg_out(", ");
219 }
220 phpdbg_xml("<arg %r");
221 if (m && j < m) {
222 char *arg_name = NULL;
223
224 if (arginfo) {
225 if (func->type == ZEND_INTERNAL_FUNCTION) {
226 arg_name = (char *)((zend_internal_arg_info *)&arginfo[j])->name;
227 } else {
228 arg_name = ZSTR_VAL(arginfo[j].name);
229 }
230 }
231
232 if (!is_variadic) {
233 is_variadic = arginfo ? arginfo[j].is_variadic : 0;
234 }
235
236 phpdbg_xml(" variadic=\"%s\" name=\"%s\">", is_variadic ? "variadic" : "", arg_name ? arg_name : "");
237 phpdbg_out("%s=%s", arg_name ? arg_name : "?", is_variadic ? "[": "");
238
239 } else {
240 phpdbg_xml(">");
241 }
242 ++j;
243
244 {
245 char *arg_print = phpdbg_short_zval_print(argstmp, 40);
246 php_printf("%s", arg_print);
247 efree(arg_print);
248 }
249
250 phpdbg_xml("</arg>");
251 } ZEND_HASH_FOREACH_END();
252
253 if (is_variadic) {
254 phpdbg_out("]");
255 }
256 phpdbg_xml("</frame>");
257 }
258 phpdbg_out(")");
259 }
260
phpdbg_dump_backtrace(size_t num)261 void phpdbg_dump_backtrace(size_t num) /* {{{ */
262 {
263 HashPosition position;
264 zval zbacktrace;
265 zval *tmp;
266 zval startline, startfile;
267 const char *startfilename;
268 zval *file = &startfile, *line = &startline;
269 int i = 0, limit = num;
270
271 PHPDBG_OUTPUT_BACKUP();
272
273 if (limit < 0) {
274 phpdbg_error("backtrace", "type=\"minnum\"", "Invalid backtrace size %d", limit);
275
276 PHPDBG_OUTPUT_BACKUP_RESTORE();
277 return;
278 }
279
280 phpdbg_try_access {
281 zend_fetch_debug_backtrace(&zbacktrace, 0, 0, limit);
282 } phpdbg_catch_access {
283 phpdbg_error("signalsegv", "", "Couldn't fetch backtrace, invalid data source");
284 return;
285 } phpdbg_end_try_access();
286
287 phpdbg_xml("<backtrace %r>");
288
289 Z_LVAL(startline) = zend_get_executed_lineno();
290 startfilename = zend_get_executed_filename();
291 Z_STR(startfile) = zend_string_init(startfilename, strlen(startfilename), 0);
292
293 zend_hash_internal_pointer_reset_ex(Z_ARRVAL(zbacktrace), &position);
294 tmp = zend_hash_get_current_data_ex(Z_ARRVAL(zbacktrace), &position);
295 while ((tmp = zend_hash_get_current_data_ex(Z_ARRVAL(zbacktrace), &position))) {
296 if (file) { /* userland */
297 phpdbg_out("frame #%d: ", i);
298 phpdbg_xml("<frame %r id=\"%d\" file=\"%s\" line=\"" ZEND_LONG_FMT "\"", i, Z_STRVAL_P(file), Z_LVAL_P(line));
299 phpdbg_dump_prototype(tmp);
300 phpdbg_out(" at %s:%ld\n", Z_STRVAL_P(file), Z_LVAL_P(line));
301 i++;
302 } else {
303 phpdbg_out(" => ");
304 phpdbg_xml("<frame %r id=\"%d\" internal=\"internal\"", i);
305 phpdbg_dump_prototype(tmp);
306 phpdbg_out(" (internal function)\n");
307 }
308
309 file = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("file"));
310 line = zend_hash_str_find(Z_ARRVAL_P(tmp), ZEND_STRL("line"));
311 zend_hash_move_forward_ex(Z_ARRVAL(zbacktrace), &position);
312 }
313
314 phpdbg_writeln("frame", "id=\"%d\" symbol=\"{main}\" file=\"%s\" line=\"%d\"", "frame #%d: {main} at %s:%ld", i, Z_STRVAL_P(file), Z_LVAL_P(line));
315 phpdbg_xml("</backtrace>");
316
317 zval_dtor(&zbacktrace);
318 zend_string_release(Z_STR(startfile));
319
320 PHPDBG_OUTPUT_BACKUP_RESTORE();
321 } /* }}} */
322
phpdbg_open_generator_frame(zend_generator * gen)323 void phpdbg_open_generator_frame(zend_generator *gen) {
324 zend_string *s;
325
326 if (EG(current_execute_data) == gen->execute_data) {
327 return;
328 }
329
330 phpdbg_restore_frame();
331
332 PHPDBG_FRAME(num) = -1;
333 PHPDBG_FRAME(generator) = gen;
334
335 EG(current_execute_data) = gen->execute_data;
336 if (gen->frozen_call_stack) {
337 zend_generator_restore_call_stack(gen);
338 }
339 gen->execute_data->prev_execute_data = NULL;
340
341 s = phpdbg_compile_stackframe(EG(current_execute_data));
342 phpdbg_notice("frame", "handle=\"%d\" frameinfo=\"%.*s\"", "Switched to generator with handle #%d: %.*s", gen->std.handle, (int) ZSTR_LEN(s), ZSTR_VAL(s));
343 zend_string_release(s);
344 phpdbg_print_cur_frame_info();
345 }
346
