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