int
jvmti_close(void *agent)
{
struct jr_code_close rec;
FILE *fp = agent;
if (!fp) {
warnx("jvmti: incalid fd in close_agent");
return -1;
}
rec.p.id = JIT_CODE_CLOSE;
rec.p.total_size = sizeof(rec);
rec.p.timestamp = perf_get_timestamp();
if (!fwrite(&rec, sizeof(rec), 1, fp))
return -1;
fclose(fp);
fp = NULL;
perf_close_marker_file();
return 0;
}
int
jvmti_write_code(void *agent, char const *sym,
uint64_t vma, void const *code, unsigned int const size)
{
static int code_generation = 1;
struct jr_code_load rec;
size_t sym_len;
FILE *fp = agent;
int ret = -1;
/* don't care about 0 length function, no samples */
if (size == 0)
return 0;
if (!fp) {
warnx("jvmti: invalid fd in write_native_code");
return -1;
}
sym_len = strlen(sym) + 1;
rec.p.id = JIT_CODE_LOAD;
rec.p.total_size = sizeof(rec) + sym_len;
rec.p.timestamp = perf_get_timestamp();
rec.code_size = size;
rec.vma = vma;
rec.code_addr = vma;
rec.pid = getpid();
rec.tid = gettid();
if (code)
rec.p.total_size += size;
/*
* If JVM is multi-threaded, nultiple concurrent calls to agent
* may be possible, so protect file writes
*/
flockfile(fp);
/*
* get code index inside lock to avoid race condition
*/
rec.code_index = code_generation++;
ret = fwrite_unlocked(&rec, sizeof(rec), 1, fp);
fwrite_unlocked(sym, sym_len, 1, fp);
if (code)
fwrite_unlocked(code, size, 1, fp);
funlockfile(fp);
ret = 0;
return ret;
}
int
jvmti_write_debug_info(void *agent, uint64_t code, const char *file,
jvmti_line_info_t *li, int nr_lines)
{
struct jr_code_debug_info rec;
size_t sret, len, size, flen;
size_t padding_count;
uint64_t addr;
const char *fn = file;
FILE *fp = agent;
int i;
/*
* no entry to write
*/
if (!nr_lines)
return 0;
if (!fp) {
warnx("jvmti: invalid fd in write_debug_info");
return -1;
}
flen = strlen(file) + 1;
rec.p.id = JIT_CODE_DEBUG_INFO;
size = sizeof(rec);
rec.p.timestamp = perf_get_timestamp();
rec.code_addr = (uint64_t)(uintptr_t)code;
rec.nr_entry = nr_lines;
/*
* on disk source line info layout:
* uint64_t : addr
* int : line number
* int : column discriminator
* file[] : source file name
* padding : pad to multiple of 8 bytes
*/
size += nr_lines * sizeof(struct debug_entry);
size += flen * nr_lines;
/*
* pad to 8 bytes
*/
padding_count = PADDING_8ALIGNED(size);
rec.p.total_size = size + padding_count;
/*
* If JVM is multi-threaded, nultiple concurrent calls to agent
* may be possible, so protect file writes
*/
flockfile(fp);
sret = fwrite_unlocked(&rec, sizeof(rec), 1, fp);
if (sret != 1)
goto error;
for (i = 0; i < nr_lines; i++) {
addr = (uint64_t)li[i].pc;
len = sizeof(addr);
sret = fwrite_unlocked(&addr, len, 1, fp);
if (sret != 1)
goto error;
len = sizeof(li[0].line_number);
sret = fwrite_unlocked(&li[i].line_number, len, 1, fp);
if (sret != 1)
goto error;
len = sizeof(li[0].discrim);
sret = fwrite_unlocked(&li[i].discrim, len, 1, fp);
if (sret != 1)
goto error;
sret = fwrite_unlocked(fn, flen, 1, fp);
if (sret != 1)
goto error;
}
if (padding_count)
sret = fwrite_unlocked(pad_bytes, padding_count, 1, fp);
if (sret != 1)
goto error;
funlockfile(fp);
return 0;
error:
funlockfile(fp);
return -1;
}
void *jvmti_open(void)
{
int pad_cnt;
char dump_path[PATH_MAX];
struct jitheader header;
int fd;
FILE *fp;
/*
* check if clockid is supported
*/
if (!perf_get_timestamp())
warnx("jvmti: kernel does not support %d clock id", perf_clk_id);
memset(&header, 0, sizeof(header));
debug_cache_init();
/*
* jitdump file name
*/
snprintf(dump_path, PATH_MAX, "%s/jit-%i.dump", jit_path, getpid());
fd = open(dump_path, O_CREAT|O_TRUNC|O_RDWR, 0666);
if (fd == -1)
return NULL;
/*
* create perf.data maker for the jitdump file
*/
if (perf_open_marker_file(fd)) {
warnx("jvmti: failed to create marker file");
return NULL;
}
fp = fdopen(fd, "w+");
if (!fp) {
warn("jvmti: cannot create %s", dump_path);
close(fd);
goto error;
}
warnx("jvmti: jitdump in %s", dump_path);
if (get_e_machine(&header)) {
warn("get_e_machine failed\n");
goto error;
}
header.magic = JITHEADER_MAGIC;
header.version = JITHEADER_VERSION;
header.total_size = sizeof(header);
header.pid = getpid();
/* calculate amount of padding '\0' */
pad_cnt = PADDING_8ALIGNED(header.total_size);
header.total_size += pad_cnt;
header.timestamp = perf_get_timestamp();
if (!fwrite(&header, sizeof(header), 1, fp)) {
warn("jvmti: cannot write dumpfile header");
goto error;
}
/* write padding '\0' if necessary */
if (pad_cnt && !fwrite(pad_bytes, pad_cnt, 1, fp)) {
warn("jvmti: cannot write dumpfile header padding");
goto error;
}
return fp;
error:
fclose(fp);
return NULL;
}
void *jvmti_open(void)
{
char dump_path[PATH_MAX];
struct jitheader header;
int fd;
FILE *fp;
init_arch_timestamp();
/*
* check if clockid is supported
*/
if (!perf_get_timestamp()) {
if (use_arch_timestamp)
warnx("jvmti: arch timestamp not supported");
else
warnx("jvmti: kernel does not support %d clock id", perf_clk_id);
}
memset(&header, 0, sizeof(header));
debug_cache_init();
/*
* jitdump file name
*/
snprintf(dump_path, PATH_MAX, "%s/jit-%i.dump", jit_path, getpid());
fd = open(dump_path, O_CREAT|O_TRUNC|O_RDWR, 0666);
if (fd == -1)
return NULL;
/*
* create perf.data maker for the jitdump file
*/
if (perf_open_marker_file(fd)) {
warnx("jvmti: failed to create marker file");
return NULL;
}
fp = fdopen(fd, "w+");
if (!fp) {
warn("jvmti: cannot create %s", dump_path);
close(fd);
goto error;
}
warnx("jvmti: jitdump in %s", dump_path);
if (get_e_machine(&header)) {
warn("get_e_machine failed\n");
goto error;
}
header.magic = JITHEADER_MAGIC;
header.version = JITHEADER_VERSION;
header.total_size = sizeof(header);
header.pid = getpid();
header.timestamp = perf_get_timestamp();
if (use_arch_timestamp)
header.flags |= JITDUMP_FLAGS_ARCH_TIMESTAMP;
if (!fwrite(&header, sizeof(header), 1, fp)) {
warn("jvmti: cannot write dumpfile header");
goto error;
}
return fp;
error:
fclose(fp);
return NULL;
}
