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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/compiler.h>
3#include <linux/string.h>
4#include <sys/types.h>
5#include <stdio.h>
6#include <string.h>
7#include <stdlib.h>
8#include <err.h>
9#include <jvmti.h>
10#ifdef HAVE_JVMTI_CMLR
11#include <jvmticmlr.h>
12#endif
13#include <limits.h>
14
15#include "jvmti_agent.h"
16
17static int has_line_numbers;
18void *jvmti_agent;
19
20static void print_error(jvmtiEnv *jvmti, const char *msg, jvmtiError ret)
21{
22 char *err_msg = NULL;
23 jvmtiError err;
24 err = (*jvmti)->GetErrorName(jvmti, ret, &err_msg);
25 if (err == JVMTI_ERROR_NONE) {
26 warnx("%s failed with %s", msg, err_msg);
27 (*jvmti)->Deallocate(jvmti, (unsigned char *)err_msg);
28 } else {
29 warnx("%s failed with an unknown error %d", msg, ret);
30 }
31}
32
33#ifdef HAVE_JVMTI_CMLR
34static jvmtiError
35do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci,
36 jvmti_line_info_t *tab, jint *nr)
37{
38 jint i, lines = 0;
39 jint nr_lines = 0;
40 jvmtiLineNumberEntry *loc_tab = NULL;
41 jvmtiError ret;
42
43 ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab);
44 if (ret != JVMTI_ERROR_NONE) {
45 print_error(jvmti, "GetLineNumberTable", ret);
46 return ret;
47 }
48
49 for (i = 0; i < nr_lines; i++) {
50 if (loc_tab[i].start_location < bci) {
51 tab[lines].pc = (unsigned long)pc;
52 tab[lines].line_number = loc_tab[i].line_number;
53 tab[lines].discrim = 0; /* not yet used */
54 tab[lines].methodID = m;
55 lines++;
56 } else {
57 break;
58 }
59 }
60 (*jvmti)->Deallocate(jvmti, (unsigned char *)loc_tab);
61 *nr = lines;
62 return JVMTI_ERROR_NONE;
63}
64
65static jvmtiError
66get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t **tab, int *nr_lines)
67{
68 const jvmtiCompiledMethodLoadRecordHeader *hdr;
69 jvmtiCompiledMethodLoadInlineRecord *rec;
70 jvmtiLineNumberEntry *lne = NULL;
71 PCStackInfo *c;
72 jint nr, ret;
73 int nr_total = 0;
74 int i, lines_total = 0;
75
76 if (!(tab && nr_lines))
77 return JVMTI_ERROR_NULL_POINTER;
78
79 /*
80 * Phase 1 -- get the number of lines necessary
81 */
82 for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
83 if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
84 rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
85 for (i = 0; i < rec->numpcs; i++) {
86 c = rec->pcinfo + i;
87 nr = 0;
88 /*
89 * unfortunately, need a tab to get the number of lines!
90 */
91 ret = (*jvmti)->GetLineNumberTable(jvmti, c->methods[0], &nr, &lne);
92 if (ret == JVMTI_ERROR_NONE) {
93 /* free what was allocated for nothing */
94 (*jvmti)->Deallocate(jvmti, (unsigned char *)lne);
95 nr_total += (int)nr;
96 } else {
97 print_error(jvmti, "GetLineNumberTable", ret);
98 }
99 }
100 }
101 }
102
103 if (nr_total == 0)
104 return JVMTI_ERROR_NOT_FOUND;
105
106 /*
107 * Phase 2 -- allocate big enough line table
108 */
109 *tab = malloc(nr_total * sizeof(**tab));
110 if (!*tab)
111 return JVMTI_ERROR_OUT_OF_MEMORY;
112
113 for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
114 if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
115 rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
116 for (i = 0; i < rec->numpcs; i++) {
117 c = rec->pcinfo + i;
118 nr = 0;
119 ret = do_get_line_numbers(jvmti, c->pc,
120 c->methods[0],
121 c->bcis[0],
122 *tab + lines_total,
123 &nr);
124 if (ret == JVMTI_ERROR_NONE)
125 lines_total += nr;
126 }
127 }
128 }
129 *nr_lines = lines_total;
130 return JVMTI_ERROR_NONE;
131}
132#else /* HAVE_JVMTI_CMLR */
133
134static jvmtiError
135get_line_numbers(jvmtiEnv *jvmti __maybe_unused, const void *compile_info __maybe_unused,
136 jvmti_line_info_t **tab __maybe_unused, int *nr_lines __maybe_unused)
137{
138 return JVMTI_ERROR_NONE;
139}
140#endif /* HAVE_JVMTI_CMLR */
141
142static void
143copy_class_filename(const char * class_sign, const char * file_name, char * result, size_t max_length)
144{
145 /*
146 * Assume path name is class hierarchy, this is a common practice with Java programs
147 */
148 if (*class_sign == 'L') {
149 int j, i = 0;
150 char *p = strrchr(class_sign, '/');
151 if (p) {
152 /* drop the 'L' prefix and copy up to the final '/' */
153 for (i = 0; i < (p - class_sign); i++)
154 result[i] = class_sign[i+1];
155 }
156 /*
157 * append file name, we use loops and not string ops to avoid modifying
158 * class_sign which is used later for the symbol name
159 */
160 for (j = 0; i < (max_length - 1) && file_name && j < strlen(file_name); j++, i++)
161 result[i] = file_name[j];
162
163 result[i] = '\0';
164 } else {
165 /* fallback case */
166 strlcpy(result, file_name, max_length);
167 }
168}
169
170static jvmtiError
171get_source_filename(jvmtiEnv *jvmti, jmethodID methodID, char ** buffer)
172{
173 jvmtiError ret;
174 jclass decl_class;
175 char *file_name = NULL;
176 char *class_sign = NULL;
177 char fn[PATH_MAX];
178 size_t len;
179
180 ret = (*jvmti)->GetMethodDeclaringClass(jvmti, methodID, &decl_class);
181 if (ret != JVMTI_ERROR_NONE) {
182 print_error(jvmti, "GetMethodDeclaringClass", ret);
183 return ret;
184 }
185
186 ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);
187 if (ret != JVMTI_ERROR_NONE) {
188 print_error(jvmti, "GetSourceFileName", ret);
189 return ret;
190 }
191
192 ret = (*jvmti)->GetClassSignature(jvmti, decl_class, &class_sign, NULL);
193 if (ret != JVMTI_ERROR_NONE) {
194 print_error(jvmti, "GetClassSignature", ret);
195 goto free_file_name_error;
196 }
197
198 copy_class_filename(class_sign, file_name, fn, PATH_MAX);
199 len = strlen(fn);
200 *buffer = malloc((len + 1) * sizeof(char));
201 if (!*buffer) {
202 print_error(jvmti, "GetClassSignature", ret);
203 ret = JVMTI_ERROR_OUT_OF_MEMORY;
204 goto free_class_sign_error;
205 }
206 strcpy(*buffer, fn);
207 ret = JVMTI_ERROR_NONE;
208
209free_class_sign_error:
210 (*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
211free_file_name_error:
212 (*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
213
214 return ret;
215}
216
217static jvmtiError
218fill_source_filenames(jvmtiEnv *jvmti, int nr_lines,
219 const jvmti_line_info_t * line_tab,
220 char ** file_names)
221{
222 int index;
223 jvmtiError ret;
224
225 for (index = 0; index < nr_lines; ++index) {
226 ret = get_source_filename(jvmti, line_tab[index].methodID, &(file_names[index]));
227 if (ret != JVMTI_ERROR_NONE)
228 return ret;
229 }
230
231 return JVMTI_ERROR_NONE;
232}
233
234static void JNICALL
235compiled_method_load_cb(jvmtiEnv *jvmti,
236 jmethodID method,
237 jint code_size,
238 void const *code_addr,
239 jint map_length,
240 jvmtiAddrLocationMap const *map,
241 const void *compile_info)
242{
243 jvmti_line_info_t *line_tab = NULL;
244 char ** line_file_names = NULL;
245 jclass decl_class;
246 char *class_sign = NULL;
247 char *func_name = NULL;
248 char *func_sign = NULL;
249 char *file_name = NULL;
250 char fn[PATH_MAX];
251 uint64_t addr = (uint64_t)(uintptr_t)code_addr;
252 jvmtiError ret;
253 int nr_lines = 0; /* in line_tab[] */
254 size_t len;
255 int output_debug_info = 0;
256
257 ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method,
258 &decl_class);
259 if (ret != JVMTI_ERROR_NONE) {
260 print_error(jvmti, "GetMethodDeclaringClass", ret);
261 return;
262 }
263
264 if (has_line_numbers && map && map_length) {
265 ret = get_line_numbers(jvmti, compile_info, &line_tab, &nr_lines);
266 if (ret != JVMTI_ERROR_NONE) {
267 warnx("jvmti: cannot get line table for method");
268 nr_lines = 0;
269 } else if (nr_lines > 0) {
270 line_file_names = malloc(sizeof(char*) * nr_lines);
271 if (!line_file_names) {
272 warnx("jvmti: cannot allocate space for line table method names");
273 } else {
274 memset(line_file_names, 0, sizeof(char*) * nr_lines);
275 ret = fill_source_filenames(jvmti, nr_lines, line_tab, line_file_names);
276 if (ret != JVMTI_ERROR_NONE) {
277 warnx("jvmti: fill_source_filenames failed");
278 } else {
279 output_debug_info = 1;
280 }
281 }
282 }
283 }
284
285 ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);
286 if (ret != JVMTI_ERROR_NONE) {
287 print_error(jvmti, "GetSourceFileName", ret);
288 goto error;
289 }
290
291 ret = (*jvmti)->GetClassSignature(jvmti, decl_class,
292 &class_sign, NULL);
293 if (ret != JVMTI_ERROR_NONE) {
294 print_error(jvmti, "GetClassSignature", ret);
295 goto error;
296 }
297
298 ret = (*jvmti)->GetMethodName(jvmti, method, &func_name,
299 &func_sign, NULL);
300 if (ret != JVMTI_ERROR_NONE) {
301 print_error(jvmti, "GetMethodName", ret);
302 goto error;
303 }
304
305 copy_class_filename(class_sign, file_name, fn, PATH_MAX);
306
307 /*
308 * write source line info record if we have it
309 */
310 if (output_debug_info)
311 if (jvmti_write_debug_info(jvmti_agent, addr, nr_lines, line_tab, (const char * const *) line_file_names))
312 warnx("jvmti: write_debug_info() failed");
313
314 len = strlen(func_name) + strlen(class_sign) + strlen(func_sign) + 2;
315 {
316 char str[len];
317 snprintf(str, len, "%s%s%s", class_sign, func_name, func_sign);
318
319 if (jvmti_write_code(jvmti_agent, str, addr, code_addr, code_size))
320 warnx("jvmti: write_code() failed");
321 }
322error:
323 (*jvmti)->Deallocate(jvmti, (unsigned char *)func_name);
324 (*jvmti)->Deallocate(jvmti, (unsigned char *)func_sign);
325 (*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
326 (*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
327 free(line_tab);
328 while (line_file_names && (nr_lines > 0)) {
329 if (line_file_names[nr_lines - 1]) {
330 free(line_file_names[nr_lines - 1]);
331 }
332 nr_lines -= 1;
333 }
334 free(line_file_names);
335}
336
337static void JNICALL
338code_generated_cb(jvmtiEnv *jvmti,
339 char const *name,
340 void const *code_addr,
341 jint code_size)
342{
343 uint64_t addr = (uint64_t)(unsigned long)code_addr;
344 int ret;
345
346 ret = jvmti_write_code(jvmti_agent, name, addr, code_addr, code_size);
347 if (ret)
348 warnx("jvmti: write_code() failed for code_generated");
349}
350
351JNIEXPORT jint JNICALL
352Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __maybe_unused)
353{
354 jvmtiEventCallbacks cb;
355 jvmtiCapabilities caps1;
356 jvmtiJlocationFormat format;
357 jvmtiEnv *jvmti = NULL;
358 jint ret;
359
360 jvmti_agent = jvmti_open();
361 if (!jvmti_agent) {
362 warnx("jvmti: open_agent failed");
363 return -1;
364 }
365
366 /*
367 * Request a JVMTI interface version 1 environment
368 */
369 ret = (*jvm)->GetEnv(jvm, (void *)&jvmti, JVMTI_VERSION_1);
370 if (ret != JNI_OK) {
371 warnx("jvmti: jvmti version 1 not supported");
372 return -1;
373 }
374
375 /*
376 * acquire method_load capability, we require it
377 * request line numbers (optional)
378 */
379 memset(&caps1, 0, sizeof(caps1));
380 caps1.can_generate_compiled_method_load_events = 1;
381
382 ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
383 if (ret != JVMTI_ERROR_NONE) {
384 print_error(jvmti, "AddCapabilities", ret);
385 return -1;
386 }
387 ret = (*jvmti)->GetJLocationFormat(jvmti, &format);
388 if (ret == JVMTI_ERROR_NONE && format == JVMTI_JLOCATION_JVMBCI) {
389 memset(&caps1, 0, sizeof(caps1));
390 caps1.can_get_line_numbers = 1;
391 caps1.can_get_source_file_name = 1;
392 ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
393 if (ret == JVMTI_ERROR_NONE)
394 has_line_numbers = 1;
395 } else if (ret != JVMTI_ERROR_NONE)
396 print_error(jvmti, "GetJLocationFormat", ret);
397
398
399 memset(&cb, 0, sizeof(cb));
400
401 cb.CompiledMethodLoad = compiled_method_load_cb;
402 cb.DynamicCodeGenerated = code_generated_cb;
403
404 ret = (*jvmti)->SetEventCallbacks(jvmti, &cb, sizeof(cb));
405 if (ret != JVMTI_ERROR_NONE) {
406 print_error(jvmti, "SetEventCallbacks", ret);
407 return -1;
408 }
409
410 ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
411 JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);
412 if (ret != JVMTI_ERROR_NONE) {
413 print_error(jvmti, "SetEventNotificationMode(METHOD_LOAD)", ret);
414 return -1;
415 }
416
417 ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
418 JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL);
419 if (ret != JVMTI_ERROR_NONE) {
420 print_error(jvmti, "SetEventNotificationMode(CODE_GENERATED)", ret);
421 return -1;
422 }
423 return 0;
424}
425
426JNIEXPORT void JNICALL
427Agent_OnUnload(JavaVM *jvm __maybe_unused)
428{
429 int ret;
430
431 ret = jvmti_close(jvmti_agent);
432 if (ret)
433 errx(1, "Error: op_close_agent()");
434}
1#include <sys/types.h>
2#include <stdio.h>
3#include <string.h>
4#include <stdlib.h>
5#include <err.h>
6#include <jvmti.h>
7#include <jvmticmlr.h>
8#include <limits.h>
9
10#include "jvmti_agent.h"
11
12static int has_line_numbers;
13void *jvmti_agent;
14
15static jvmtiError
16do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci,
17 jvmti_line_info_t *tab, jint *nr)
18{
19 jint i, lines = 0;
20 jint nr_lines = 0;
21 jvmtiLineNumberEntry *loc_tab = NULL;
22 jvmtiError ret;
23
24 ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab);
25 if (ret != JVMTI_ERROR_NONE)
26 return ret;
27
28 for (i = 0; i < nr_lines; i++) {
29 if (loc_tab[i].start_location < bci) {
30 tab[lines].pc = (unsigned long)pc;
31 tab[lines].line_number = loc_tab[i].line_number;
32 tab[lines].discrim = 0; /* not yet used */
33 lines++;
34 } else {
35 break;
36 }
37 }
38 (*jvmti)->Deallocate(jvmti, (unsigned char *)loc_tab);
39 *nr = lines;
40 return JVMTI_ERROR_NONE;
41}
42
43static jvmtiError
44get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t **tab, int *nr_lines)
45{
46 const jvmtiCompiledMethodLoadRecordHeader *hdr;
47 jvmtiCompiledMethodLoadInlineRecord *rec;
48 jvmtiLineNumberEntry *lne = NULL;
49 PCStackInfo *c;
50 jint nr, ret;
51 int nr_total = 0;
52 int i, lines_total = 0;
53
54 if (!(tab && nr_lines))
55 return JVMTI_ERROR_NULL_POINTER;
56
57 /*
58 * Phase 1 -- get the number of lines necessary
59 */
60 for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
61 if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
62 rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
63 for (i = 0; i < rec->numpcs; i++) {
64 c = rec->pcinfo + i;
65 nr = 0;
66 /*
67 * unfortunately, need a tab to get the number of lines!
68 */
69 ret = (*jvmti)->GetLineNumberTable(jvmti, c->methods[0], &nr, &lne);
70 if (ret == JVMTI_ERROR_NONE) {
71 /* free what was allocated for nothing */
72 (*jvmti)->Deallocate(jvmti, (unsigned char *)lne);
73 nr_total += (int)nr;
74 }
75 }
76 }
77 }
78
79 if (nr_total == 0)
80 return JVMTI_ERROR_NOT_FOUND;
81
82 /*
83 * Phase 2 -- allocate big enough line table
84 */
85 *tab = malloc(nr_total * sizeof(**tab));
86 if (!*tab)
87 return JVMTI_ERROR_OUT_OF_MEMORY;
88
89 for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
90 if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
91 rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
92 for (i = 0; i < rec->numpcs; i++) {
93 c = rec->pcinfo + i;
94 nr = 0;
95 ret = do_get_line_numbers(jvmti, c->pc,
96 c->methods[0],
97 c->bcis[0],
98 *tab + lines_total,
99 &nr);
100 if (ret == JVMTI_ERROR_NONE)
101 lines_total += nr;
102 }
103 }
104 }
105 *nr_lines = lines_total;
106 return JVMTI_ERROR_NONE;
107}
108
109static void JNICALL
110compiled_method_load_cb(jvmtiEnv *jvmti,
111 jmethodID method,
112 jint code_size,
113 void const *code_addr,
114 jint map_length,
115 jvmtiAddrLocationMap const *map,
116 const void *compile_info)
117{
118 jvmti_line_info_t *line_tab = NULL;
119 jclass decl_class;
120 char *class_sign = NULL;
121 char *func_name = NULL;
122 char *func_sign = NULL;
123 char *file_name= NULL;
124 char fn[PATH_MAX];
125 uint64_t addr = (uint64_t)(uintptr_t)code_addr;
126 jvmtiError ret;
127 int nr_lines = 0; /* in line_tab[] */
128 size_t len;
129
130 ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method,
131 &decl_class);
132 if (ret != JVMTI_ERROR_NONE) {
133 warnx("jvmti: cannot get declaring class");
134 return;
135 }
136
137 if (has_line_numbers && map && map_length) {
138 ret = get_line_numbers(jvmti, compile_info, &line_tab, &nr_lines);
139 if (ret != JVMTI_ERROR_NONE) {
140 warnx("jvmti: cannot get line table for method");
141 nr_lines = 0;
142 }
143 }
144
145 ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);
146 if (ret != JVMTI_ERROR_NONE) {
147 warnx("jvmti: cannot get source filename ret=%d", ret);
148 goto error;
149 }
150
151 ret = (*jvmti)->GetClassSignature(jvmti, decl_class,
152 &class_sign, NULL);
153 if (ret != JVMTI_ERROR_NONE) {
154 warnx("jvmti: getclassignature failed");
155 goto error;
156 }
157
158 ret = (*jvmti)->GetMethodName(jvmti, method, &func_name,
159 &func_sign, NULL);
160 if (ret != JVMTI_ERROR_NONE) {
161 warnx("jvmti: failed getmethodname");
162 goto error;
163 }
164
165 /*
166 * Assume path name is class hierarchy, this is a common practice with Java programs
167 */
168 if (*class_sign == 'L') {
169 int j, i = 0;
170 char *p = strrchr(class_sign, '/');
171 if (p) {
172 /* drop the 'L' prefix and copy up to the final '/' */
173 for (i = 0; i < (p - class_sign); i++)
174 fn[i] = class_sign[i+1];
175 }
176 /*
177 * append file name, we use loops and not string ops to avoid modifying
178 * class_sign which is used later for the symbol name
179 */
180 for (j = 0; i < (PATH_MAX - 1) && file_name && j < strlen(file_name); j++, i++)
181 fn[i] = file_name[j];
182 fn[i] = '\0';
183 } else {
184 /* fallback case */
185 strcpy(fn, file_name);
186 }
187 /*
188 * write source line info record if we have it
189 */
190 if (jvmti_write_debug_info(jvmti_agent, addr, fn, line_tab, nr_lines))
191 warnx("jvmti: write_debug_info() failed");
192
193 len = strlen(func_name) + strlen(class_sign) + strlen(func_sign) + 2;
194 {
195 char str[len];
196 snprintf(str, len, "%s%s%s", class_sign, func_name, func_sign);
197
198 if (jvmti_write_code(jvmti_agent, str, addr, code_addr, code_size))
199 warnx("jvmti: write_code() failed");
200 }
201error:
202 (*jvmti)->Deallocate(jvmti, (unsigned char *)func_name);
203 (*jvmti)->Deallocate(jvmti, (unsigned char *)func_sign);
204 (*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
205 (*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
206 free(line_tab);
207}
208
209static void JNICALL
210code_generated_cb(jvmtiEnv *jvmti,
211 char const *name,
212 void const *code_addr,
213 jint code_size)
214{
215 uint64_t addr = (uint64_t)(unsigned long)code_addr;
216 int ret;
217
218 ret = jvmti_write_code(jvmti_agent, name, addr, code_addr, code_size);
219 if (ret)
220 warnx("jvmti: write_code() failed for code_generated");
221}
222
223JNIEXPORT jint JNICALL
224Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __unused)
225{
226 jvmtiEventCallbacks cb;
227 jvmtiCapabilities caps1;
228 jvmtiJlocationFormat format;
229 jvmtiEnv *jvmti = NULL;
230 jint ret;
231
232 jvmti_agent = jvmti_open();
233 if (!jvmti_agent) {
234 warnx("jvmti: open_agent failed");
235 return -1;
236 }
237
238 /*
239 * Request a JVMTI interface version 1 environment
240 */
241 ret = (*jvm)->GetEnv(jvm, (void *)&jvmti, JVMTI_VERSION_1);
242 if (ret != JNI_OK) {
243 warnx("jvmti: jvmti version 1 not supported");
244 return -1;
245 }
246
247 /*
248 * acquire method_load capability, we require it
249 * request line numbers (optional)
250 */
251 memset(&caps1, 0, sizeof(caps1));
252 caps1.can_generate_compiled_method_load_events = 1;
253
254 ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
255 if (ret != JVMTI_ERROR_NONE) {
256 warnx("jvmti: acquire compiled_method capability failed");
257 return -1;
258 }
259 ret = (*jvmti)->GetJLocationFormat(jvmti, &format);
260 if (ret == JVMTI_ERROR_NONE && format == JVMTI_JLOCATION_JVMBCI) {
261 memset(&caps1, 0, sizeof(caps1));
262 caps1.can_get_line_numbers = 1;
263 caps1.can_get_source_file_name = 1;
264 ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
265 if (ret == JVMTI_ERROR_NONE)
266 has_line_numbers = 1;
267 }
268
269 memset(&cb, 0, sizeof(cb));
270
271 cb.CompiledMethodLoad = compiled_method_load_cb;
272 cb.DynamicCodeGenerated = code_generated_cb;
273
274 ret = (*jvmti)->SetEventCallbacks(jvmti, &cb, sizeof(cb));
275 if (ret != JVMTI_ERROR_NONE) {
276 warnx("jvmti: cannot set event callbacks");
277 return -1;
278 }
279
280 ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
281 JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);
282 if (ret != JVMTI_ERROR_NONE) {
283 warnx("jvmti: setnotification failed for method_load");
284 return -1;
285 }
286
287 ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
288 JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL);
289 if (ret != JVMTI_ERROR_NONE) {
290 warnx("jvmti: setnotification failed on code_generated");
291 return -1;
292 }
293 return 0;
294}
295
296JNIEXPORT void JNICALL
297Agent_OnUnload(JavaVM *jvm __unused)
298{
299 int ret;
300
301 ret = jvmti_close(jvmti_agent);
302 if (ret)
303 errx(1, "Error: op_close_agent()");
304}