Arnaldo Carvalho de Melo | 0353631 | 2017-06-16 12:18:27 -0300 | [diff] [blame^] | 1 | #include <linux/compiler.h> |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 2 | #include <sys/types.h> |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <err.h> |
| 7 | #include <jvmti.h> |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 8 | #include <jvmticmlr.h> |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 9 | #include <limits.h> |
| 10 | |
| 11 | #include "jvmti_agent.h" |
| 12 | |
| 13 | static int has_line_numbers; |
| 14 | void *jvmti_agent; |
| 15 | |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 16 | static void print_error(jvmtiEnv *jvmti, const char *msg, jvmtiError ret) |
| 17 | { |
| 18 | char *err_msg = NULL; |
| 19 | jvmtiError err; |
| 20 | err = (*jvmti)->GetErrorName(jvmti, ret, &err_msg); |
| 21 | if (err == JVMTI_ERROR_NONE) { |
| 22 | warnx("%s failed with %s", msg, err_msg); |
| 23 | (*jvmti)->Deallocate(jvmti, (unsigned char *)err_msg); |
| 24 | } else { |
| 25 | warnx("%s failed with an unknown error %d", msg, ret); |
| 26 | } |
| 27 | } |
| 28 | |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 29 | static jvmtiError |
| 30 | do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci, |
| 31 | jvmti_line_info_t *tab, jint *nr) |
| 32 | { |
| 33 | jint i, lines = 0; |
| 34 | jint nr_lines = 0; |
| 35 | jvmtiLineNumberEntry *loc_tab = NULL; |
| 36 | jvmtiError ret; |
| 37 | |
| 38 | ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab); |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 39 | if (ret != JVMTI_ERROR_NONE) { |
| 40 | print_error(jvmti, "GetLineNumberTable", ret); |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 41 | return ret; |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 42 | } |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 43 | |
| 44 | for (i = 0; i < nr_lines; i++) { |
| 45 | if (loc_tab[i].start_location < bci) { |
| 46 | tab[lines].pc = (unsigned long)pc; |
| 47 | tab[lines].line_number = loc_tab[i].line_number; |
| 48 | tab[lines].discrim = 0; /* not yet used */ |
| 49 | lines++; |
| 50 | } else { |
| 51 | break; |
| 52 | } |
| 53 | } |
| 54 | (*jvmti)->Deallocate(jvmti, (unsigned char *)loc_tab); |
| 55 | *nr = lines; |
| 56 | return JVMTI_ERROR_NONE; |
| 57 | } |
| 58 | |
| 59 | static jvmtiError |
| 60 | get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t **tab, int *nr_lines) |
| 61 | { |
| 62 | const jvmtiCompiledMethodLoadRecordHeader *hdr; |
| 63 | jvmtiCompiledMethodLoadInlineRecord *rec; |
| 64 | jvmtiLineNumberEntry *lne = NULL; |
| 65 | PCStackInfo *c; |
| 66 | jint nr, ret; |
| 67 | int nr_total = 0; |
| 68 | int i, lines_total = 0; |
| 69 | |
| 70 | if (!(tab && nr_lines)) |
| 71 | return JVMTI_ERROR_NULL_POINTER; |
| 72 | |
| 73 | /* |
| 74 | * Phase 1 -- get the number of lines necessary |
| 75 | */ |
| 76 | for (hdr = compile_info; hdr != NULL; hdr = hdr->next) { |
| 77 | if (hdr->kind == JVMTI_CMLR_INLINE_INFO) { |
| 78 | rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr; |
| 79 | for (i = 0; i < rec->numpcs; i++) { |
| 80 | c = rec->pcinfo + i; |
| 81 | nr = 0; |
| 82 | /* |
| 83 | * unfortunately, need a tab to get the number of lines! |
| 84 | */ |
| 85 | ret = (*jvmti)->GetLineNumberTable(jvmti, c->methods[0], &nr, &lne); |
| 86 | if (ret == JVMTI_ERROR_NONE) { |
| 87 | /* free what was allocated for nothing */ |
| 88 | (*jvmti)->Deallocate(jvmti, (unsigned char *)lne); |
| 89 | nr_total += (int)nr; |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 90 | } else { |
| 91 | print_error(jvmti, "GetLineNumberTable", ret); |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 92 | } |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | if (nr_total == 0) |
| 98 | return JVMTI_ERROR_NOT_FOUND; |
| 99 | |
| 100 | /* |
| 101 | * Phase 2 -- allocate big enough line table |
| 102 | */ |
| 103 | *tab = malloc(nr_total * sizeof(**tab)); |
| 104 | if (!*tab) |
| 105 | return JVMTI_ERROR_OUT_OF_MEMORY; |
| 106 | |
| 107 | for (hdr = compile_info; hdr != NULL; hdr = hdr->next) { |
| 108 | if (hdr->kind == JVMTI_CMLR_INLINE_INFO) { |
| 109 | rec = (jvmtiCompiledMethodLoadInlineRecord *)hdr; |
| 110 | for (i = 0; i < rec->numpcs; i++) { |
| 111 | c = rec->pcinfo + i; |
| 112 | nr = 0; |
| 113 | ret = do_get_line_numbers(jvmti, c->pc, |
| 114 | c->methods[0], |
| 115 | c->bcis[0], |
| 116 | *tab + lines_total, |
| 117 | &nr); |
| 118 | if (ret == JVMTI_ERROR_NONE) |
| 119 | lines_total += nr; |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | *nr_lines = lines_total; |
| 124 | return JVMTI_ERROR_NONE; |
| 125 | } |
| 126 | |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 127 | static void JNICALL |
| 128 | compiled_method_load_cb(jvmtiEnv *jvmti, |
| 129 | jmethodID method, |
| 130 | jint code_size, |
| 131 | void const *code_addr, |
| 132 | jint map_length, |
| 133 | jvmtiAddrLocationMap const *map, |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 134 | const void *compile_info) |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 135 | { |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 136 | jvmti_line_info_t *line_tab = NULL; |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 137 | jclass decl_class; |
| 138 | char *class_sign = NULL; |
| 139 | char *func_name = NULL; |
| 140 | char *func_sign = NULL; |
| 141 | char *file_name= NULL; |
| 142 | char fn[PATH_MAX]; |
| 143 | uint64_t addr = (uint64_t)(uintptr_t)code_addr; |
| 144 | jvmtiError ret; |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 145 | int nr_lines = 0; /* in line_tab[] */ |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 146 | size_t len; |
| 147 | |
| 148 | ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method, |
| 149 | &decl_class); |
| 150 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 151 | print_error(jvmti, "GetMethodDeclaringClass", ret); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 152 | return; |
| 153 | } |
| 154 | |
| 155 | if (has_line_numbers && map && map_length) { |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 156 | ret = get_line_numbers(jvmti, compile_info, &line_tab, &nr_lines); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 157 | if (ret != JVMTI_ERROR_NONE) { |
| 158 | warnx("jvmti: cannot get line table for method"); |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 159 | nr_lines = 0; |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 160 | } |
| 161 | } |
| 162 | |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 163 | ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name); |
| 164 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 165 | print_error(jvmti, "GetSourceFileName", ret); |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 166 | goto error; |
| 167 | } |
| 168 | |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 169 | ret = (*jvmti)->GetClassSignature(jvmti, decl_class, |
| 170 | &class_sign, NULL); |
| 171 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 172 | print_error(jvmti, "GetClassSignature", ret); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 173 | goto error; |
| 174 | } |
| 175 | |
| 176 | ret = (*jvmti)->GetMethodName(jvmti, method, &func_name, |
| 177 | &func_sign, NULL); |
| 178 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 179 | print_error(jvmti, "GetMethodName", ret); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 180 | goto error; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Assume path name is class hierarchy, this is a common practice with Java programs |
| 185 | */ |
| 186 | if (*class_sign == 'L') { |
| 187 | int j, i = 0; |
| 188 | char *p = strrchr(class_sign, '/'); |
| 189 | if (p) { |
| 190 | /* drop the 'L' prefix and copy up to the final '/' */ |
| 191 | for (i = 0; i < (p - class_sign); i++) |
| 192 | fn[i] = class_sign[i+1]; |
| 193 | } |
| 194 | /* |
| 195 | * append file name, we use loops and not string ops to avoid modifying |
| 196 | * class_sign which is used later for the symbol name |
| 197 | */ |
| 198 | for (j = 0; i < (PATH_MAX - 1) && file_name && j < strlen(file_name); j++, i++) |
| 199 | fn[i] = file_name[j]; |
| 200 | fn[i] = '\0'; |
| 201 | } else { |
| 202 | /* fallback case */ |
| 203 | strcpy(fn, file_name); |
| 204 | } |
| 205 | /* |
| 206 | * write source line info record if we have it |
| 207 | */ |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 208 | if (jvmti_write_debug_info(jvmti_agent, addr, fn, line_tab, nr_lines)) |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 209 | warnx("jvmti: write_debug_info() failed"); |
| 210 | |
| 211 | len = strlen(func_name) + strlen(class_sign) + strlen(func_sign) + 2; |
| 212 | { |
| 213 | char str[len]; |
| 214 | snprintf(str, len, "%s%s%s", class_sign, func_name, func_sign); |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 215 | |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 216 | if (jvmti_write_code(jvmti_agent, str, addr, code_addr, code_size)) |
| 217 | warnx("jvmti: write_code() failed"); |
| 218 | } |
| 219 | error: |
| 220 | (*jvmti)->Deallocate(jvmti, (unsigned char *)func_name); |
| 221 | (*jvmti)->Deallocate(jvmti, (unsigned char *)func_sign); |
| 222 | (*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 223 | (*jvmti)->Deallocate(jvmti, (unsigned char *)file_name); |
Stephane Eranian | 598b7c6 | 2015-11-30 10:02:23 +0100 | [diff] [blame] | 224 | free(line_tab); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | static void JNICALL |
| 228 | code_generated_cb(jvmtiEnv *jvmti, |
| 229 | char const *name, |
| 230 | void const *code_addr, |
| 231 | jint code_size) |
| 232 | { |
| 233 | uint64_t addr = (uint64_t)(unsigned long)code_addr; |
| 234 | int ret; |
| 235 | |
| 236 | ret = jvmti_write_code(jvmti_agent, name, addr, code_addr, code_size); |
| 237 | if (ret) |
| 238 | warnx("jvmti: write_code() failed for code_generated"); |
| 239 | } |
| 240 | |
| 241 | JNIEXPORT jint JNICALL |
Arnaldo Carvalho de Melo | 0353631 | 2017-06-16 12:18:27 -0300 | [diff] [blame^] | 242 | Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __maybe_unused) |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 243 | { |
| 244 | jvmtiEventCallbacks cb; |
| 245 | jvmtiCapabilities caps1; |
| 246 | jvmtiJlocationFormat format; |
| 247 | jvmtiEnv *jvmti = NULL; |
| 248 | jint ret; |
| 249 | |
| 250 | jvmti_agent = jvmti_open(); |
| 251 | if (!jvmti_agent) { |
| 252 | warnx("jvmti: open_agent failed"); |
| 253 | return -1; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Request a JVMTI interface version 1 environment |
| 258 | */ |
| 259 | ret = (*jvm)->GetEnv(jvm, (void *)&jvmti, JVMTI_VERSION_1); |
| 260 | if (ret != JNI_OK) { |
| 261 | warnx("jvmti: jvmti version 1 not supported"); |
| 262 | return -1; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * acquire method_load capability, we require it |
| 267 | * request line numbers (optional) |
| 268 | */ |
| 269 | memset(&caps1, 0, sizeof(caps1)); |
| 270 | caps1.can_generate_compiled_method_load_events = 1; |
| 271 | |
| 272 | ret = (*jvmti)->AddCapabilities(jvmti, &caps1); |
| 273 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 274 | print_error(jvmti, "AddCapabilities", ret); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 275 | return -1; |
| 276 | } |
| 277 | ret = (*jvmti)->GetJLocationFormat(jvmti, &format); |
| 278 | if (ret == JVMTI_ERROR_NONE && format == JVMTI_JLOCATION_JVMBCI) { |
| 279 | memset(&caps1, 0, sizeof(caps1)); |
| 280 | caps1.can_get_line_numbers = 1; |
| 281 | caps1.can_get_source_file_name = 1; |
| 282 | ret = (*jvmti)->AddCapabilities(jvmti, &caps1); |
| 283 | if (ret == JVMTI_ERROR_NONE) |
| 284 | has_line_numbers = 1; |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 285 | } else if (ret != JVMTI_ERROR_NONE) |
| 286 | print_error(jvmti, "GetJLocationFormat", ret); |
| 287 | |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 288 | |
| 289 | memset(&cb, 0, sizeof(cb)); |
| 290 | |
| 291 | cb.CompiledMethodLoad = compiled_method_load_cb; |
| 292 | cb.DynamicCodeGenerated = code_generated_cb; |
| 293 | |
| 294 | ret = (*jvmti)->SetEventCallbacks(jvmti, &cb, sizeof(cb)); |
| 295 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 296 | print_error(jvmti, "SetEventCallbacks", ret); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 297 | return -1; |
| 298 | } |
| 299 | |
| 300 | ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 301 | JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL); |
| 302 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 303 | print_error(jvmti, "SetEventNotificationMode(METHOD_LOAD)", ret); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 304 | return -1; |
| 305 | } |
| 306 | |
| 307 | ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| 308 | JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL); |
| 309 | if (ret != JVMTI_ERROR_NONE) { |
Stephane Eranian | cdd75e3 | 2016-10-13 03:59:35 -0700 | [diff] [blame] | 310 | print_error(jvmti, "SetEventNotificationMode(CODE_GENERATED)", ret); |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 311 | return -1; |
| 312 | } |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | JNIEXPORT void JNICALL |
Arnaldo Carvalho de Melo | 0353631 | 2017-06-16 12:18:27 -0300 | [diff] [blame^] | 317 | Agent_OnUnload(JavaVM *jvm __maybe_unused) |
Stephane Eranian | 209045a | 2015-11-30 10:02:22 +0100 | [diff] [blame] | 318 | { |
| 319 | int ret; |
| 320 | |
| 321 | ret = jvmti_close(jvmti_agent); |
| 322 | if (ret) |
| 323 | errx(1, "Error: op_close_agent()"); |
| 324 | } |