Loading...
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}
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 void print_error(jvmtiEnv *jvmti, const char *msg, jvmtiError ret)
16{
17 char *err_msg = NULL;
18 jvmtiError err;
19 err = (*jvmti)->GetErrorName(jvmti, ret, &err_msg);
20 if (err == JVMTI_ERROR_NONE) {
21 warnx("%s failed with %s", msg, err_msg);
22 (*jvmti)->Deallocate(jvmti, (unsigned char *)err_msg);
23 } else {
24 warnx("%s failed with an unknown error %d", msg, ret);
25 }
26}
27
28static jvmtiError
29do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci,
30 jvmti_line_info_t *tab, jint *nr)
31{
32 jint i, lines = 0;
33 jint nr_lines = 0;
34 jvmtiLineNumberEntry *loc_tab = NULL;
35 jvmtiError ret;
36
37 ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab);
38 if (ret != JVMTI_ERROR_NONE) {
39 print_error(jvmti, "GetLineNumberTable", ret);
40 return ret;
41 }
42
43 for (i = 0; i < nr_lines; i++) {
44 if (loc_tab[i].start_location < bci) {
45 tab[lines].pc = (unsigned long)pc;
46 tab[lines].line_number = loc_tab[i].line_number;
47 tab[lines].discrim = 0; /* not yet used */
48 lines++;
49 } else {
50 break;
51 }
52 }
53 (*jvmti)->Deallocate(jvmti, (unsigned char *)loc_tab);
54 *nr = lines;
55 return JVMTI_ERROR_NONE;
56}
57
58static jvmtiError
59get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t **tab, int *nr_lines)
60{
61 const jvmtiCompiledMethodLoadRecordHeader *hdr;
62 jvmtiCompiledMethodLoadInlineRecord *rec;
63 jvmtiLineNumberEntry *lne = NULL;
64 PCStackInfo *c;
65 jint nr, ret;
66 int nr_total = 0;
67 int i, lines_total = 0;
68
69 if (!(tab && nr_lines))
70 return JVMTI_ERROR_NULL_POINTER;
71
72 /*
73 * Phase 1 -- get the number of lines necessary
74 */
75 for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
76 if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
77 rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
78 for (i = 0; i < rec->numpcs; i++) {
79 c = rec->pcinfo + i;
80 nr = 0;
81 /*
82 * unfortunately, need a tab to get the number of lines!
83 */
84 ret = (*jvmti)->GetLineNumberTable(jvmti, c->methods[0], &nr, &lne);
85 if (ret == JVMTI_ERROR_NONE) {
86 /* free what was allocated for nothing */
87 (*jvmti)->Deallocate(jvmti, (unsigned char *)lne);
88 nr_total += (int)nr;
89 } else {
90 print_error(jvmti, "GetLineNumberTable", ret);
91 }
92 }
93 }
94 }
95
96 if (nr_total == 0)
97 return JVMTI_ERROR_NOT_FOUND;
98
99 /*
100 * Phase 2 -- allocate big enough line table
101 */
102 *tab = malloc(nr_total * sizeof(**tab));
103 if (!*tab)
104 return JVMTI_ERROR_OUT_OF_MEMORY;
105
106 for (hdr = compile_info; hdr != NULL; hdr = hdr->next) {
107 if (hdr->kind == JVMTI_CMLR_INLINE_INFO) {
108 rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr;
109 for (i = 0; i < rec->numpcs; i++) {
110 c = rec->pcinfo + i;
111 nr = 0;
112 ret = do_get_line_numbers(jvmti, c->pc,
113 c->methods[0],
114 c->bcis[0],
115 *tab + lines_total,
116 &nr);
117 if (ret == JVMTI_ERROR_NONE)
118 lines_total += nr;
119 }
120 }
121 }
122 *nr_lines = lines_total;
123 return JVMTI_ERROR_NONE;
124}
125
126static void JNICALL
127compiled_method_load_cb(jvmtiEnv *jvmti,
128 jmethodID method,
129 jint code_size,
130 void const *code_addr,
131 jint map_length,
132 jvmtiAddrLocationMap const *map,
133 const void *compile_info)
134{
135 jvmti_line_info_t *line_tab = NULL;
136 jclass decl_class;
137 char *class_sign = NULL;
138 char *func_name = NULL;
139 char *func_sign = NULL;
140 char *file_name= NULL;
141 char fn[PATH_MAX];
142 uint64_t addr = (uint64_t)(uintptr_t)code_addr;
143 jvmtiError ret;
144 int nr_lines = 0; /* in line_tab[] */
145 size_t len;
146
147 ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method,
148 &decl_class);
149 if (ret != JVMTI_ERROR_NONE) {
150 print_error(jvmti, "GetMethodDeclaringClass", ret);
151 return;
152 }
153
154 if (has_line_numbers && map && map_length) {
155 ret = get_line_numbers(jvmti, compile_info, &line_tab, &nr_lines);
156 if (ret != JVMTI_ERROR_NONE) {
157 warnx("jvmti: cannot get line table for method");
158 nr_lines = 0;
159 }
160 }
161
162 ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);
163 if (ret != JVMTI_ERROR_NONE) {
164 print_error(jvmti, "GetSourceFileName", ret);
165 goto error;
166 }
167
168 ret = (*jvmti)->GetClassSignature(jvmti, decl_class,
169 &class_sign, NULL);
170 if (ret != JVMTI_ERROR_NONE) {
171 print_error(jvmti, "GetClassSignature", ret);
172 goto error;
173 }
174
175 ret = (*jvmti)->GetMethodName(jvmti, method, &func_name,
176 &func_sign, NULL);
177 if (ret != JVMTI_ERROR_NONE) {
178 print_error(jvmti, "GetMethodName", ret);
179 goto error;
180 }
181
182 /*
183 * Assume path name is class hierarchy, this is a common practice with Java programs
184 */
185 if (*class_sign == 'L') {
186 int j, i = 0;
187 char *p = strrchr(class_sign, '/');
188 if (p) {
189 /* drop the 'L' prefix and copy up to the final '/' */
190 for (i = 0; i < (p - class_sign); i++)
191 fn[i] = class_sign[i+1];
192 }
193 /*
194 * append file name, we use loops and not string ops to avoid modifying
195 * class_sign which is used later for the symbol name
196 */
197 for (j = 0; i < (PATH_MAX - 1) && file_name && j < strlen(file_name); j++, i++)
198 fn[i] = file_name[j];
199 fn[i] = '\0';
200 } else {
201 /* fallback case */
202 strcpy(fn, file_name);
203 }
204 /*
205 * write source line info record if we have it
206 */
207 if (jvmti_write_debug_info(jvmti_agent, addr, fn, line_tab, nr_lines))
208 warnx("jvmti: write_debug_info() failed");
209
210 len = strlen(func_name) + strlen(class_sign) + strlen(func_sign) + 2;
211 {
212 char str[len];
213 snprintf(str, len, "%s%s%s", class_sign, func_name, func_sign);
214
215 if (jvmti_write_code(jvmti_agent, str, addr, code_addr, code_size))
216 warnx("jvmti: write_code() failed");
217 }
218error:
219 (*jvmti)->Deallocate(jvmti, (unsigned char *)func_name);
220 (*jvmti)->Deallocate(jvmti, (unsigned char *)func_sign);
221 (*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
222 (*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
223 free(line_tab);
224}
225
226static void JNICALL
227code_generated_cb(jvmtiEnv *jvmti,
228 char const *name,
229 void const *code_addr,
230 jint code_size)
231{
232 uint64_t addr = (uint64_t)(unsigned long)code_addr;
233 int ret;
234
235 ret = jvmti_write_code(jvmti_agent, name, addr, code_addr, code_size);
236 if (ret)
237 warnx("jvmti: write_code() failed for code_generated");
238}
239
240JNIEXPORT jint JNICALL
241Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __unused)
242{
243 jvmtiEventCallbacks cb;
244 jvmtiCapabilities caps1;
245 jvmtiJlocationFormat format;
246 jvmtiEnv *jvmti = NULL;
247 jint ret;
248
249 jvmti_agent = jvmti_open();
250 if (!jvmti_agent) {
251 warnx("jvmti: open_agent failed");
252 return -1;
253 }
254
255 /*
256 * Request a JVMTI interface version 1 environment
257 */
258 ret = (*jvm)->GetEnv(jvm, (void *)&jvmti, JVMTI_VERSION_1);
259 if (ret != JNI_OK) {
260 warnx("jvmti: jvmti version 1 not supported");
261 return -1;
262 }
263
264 /*
265 * acquire method_load capability, we require it
266 * request line numbers (optional)
267 */
268 memset(&caps1, 0, sizeof(caps1));
269 caps1.can_generate_compiled_method_load_events = 1;
270
271 ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
272 if (ret != JVMTI_ERROR_NONE) {
273 print_error(jvmti, "AddCapabilities", ret);
274 return -1;
275 }
276 ret = (*jvmti)->GetJLocationFormat(jvmti, &format);
277 if (ret == JVMTI_ERROR_NONE && format == JVMTI_JLOCATION_JVMBCI) {
278 memset(&caps1, 0, sizeof(caps1));
279 caps1.can_get_line_numbers = 1;
280 caps1.can_get_source_file_name = 1;
281 ret = (*jvmti)->AddCapabilities(jvmti, &caps1);
282 if (ret == JVMTI_ERROR_NONE)
283 has_line_numbers = 1;
284 } else if (ret != JVMTI_ERROR_NONE)
285 print_error(jvmti, "GetJLocationFormat", ret);
286
287
288 memset(&cb, 0, sizeof(cb));
289
290 cb.CompiledMethodLoad = compiled_method_load_cb;
291 cb.DynamicCodeGenerated = code_generated_cb;
292
293 ret = (*jvmti)->SetEventCallbacks(jvmti, &cb, sizeof(cb));
294 if (ret != JVMTI_ERROR_NONE) {
295 print_error(jvmti, "SetEventCallbacks", ret);
296 return -1;
297 }
298
299 ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
300 JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);
301 if (ret != JVMTI_ERROR_NONE) {
302 print_error(jvmti, "SetEventNotificationMode(METHOD_LOAD)", ret);
303 return -1;
304 }
305
306 ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
307 JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL);
308 if (ret != JVMTI_ERROR_NONE) {
309 print_error(jvmti, "SetEventNotificationMode(CODE_GENERATED)", ret);
310 return -1;
311 }
312 return 0;
313}
314
315JNIEXPORT void JNICALL
316Agent_OnUnload(JavaVM *jvm __unused)
317{
318 int ret;
319
320 ret = jvmti_close(jvmti_agent);
321 if (ret)
322 errx(1, "Error: op_close_agent()");
323}