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-rw-r--r--tools/perf/jvmti/Build21
-rw-r--r--tools/perf/jvmti/jvmti_agent.c496
-rw-r--r--tools/perf/jvmti/jvmti_agent.h34
-rw-r--r--tools/perf/jvmti/libjvmti.c420
4 files changed, 971 insertions, 0 deletions
diff --git a/tools/perf/jvmti/Build b/tools/perf/jvmti/Build
new file mode 100644
index 000000000..202cadaaf
--- /dev/null
+++ b/tools/perf/jvmti/Build
@@ -0,0 +1,21 @@
+jvmti-y += libjvmti.o
+jvmti-y += jvmti_agent.o
+
+# For strlcpy
+jvmti-y += libstring.o libctype.o
+
+CFLAGS_jvmti = -fPIC -DPIC -I$(JDIR)/include -I$(JDIR)/include/linux
+CFLAGS_REMOVE_jvmti = -Wmissing-declarations
+CFLAGS_REMOVE_jvmti += -Wstrict-prototypes
+CFLAGS_REMOVE_jvmti += -Wextra
+CFLAGS_REMOVE_jvmti += -Wwrite-strings
+
+CFLAGS_libstring.o += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
+
+$(OUTPUT)jvmti/libstring.o: ../lib/string.c FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)
+
+$(OUTPUT)jvmti/libctype.o: ../lib/ctype.c FORCE
+ $(call rule_mkdir)
+ $(call if_changed_dep,cc_o_c)
diff --git a/tools/perf/jvmti/jvmti_agent.c b/tools/perf/jvmti/jvmti_agent.c
new file mode 100644
index 000000000..526dcaf9f
--- /dev/null
+++ b/tools/perf/jvmti/jvmti_agent.c
@@ -0,0 +1,496 @@
+/*
+ * jvmti_agent.c: JVMTI agent interface
+ *
+ * Adapted from the Oprofile code in opagent.c:
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Copyright 2007 OProfile authors
+ * Jens Wilke
+ * Daniel Hansel
+ * Copyright IBM Corporation 2007
+ */
+#include <sys/types.h>
+#include <sys/stat.h> /* for mkdir() */
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/mman.h>
+#include <syscall.h> /* for gettid() */
+#include <err.h>
+#include <linux/kernel.h>
+
+#include "jvmti_agent.h"
+#include "../util/jitdump.h"
+
+#define JIT_LANG "java"
+
+static char jit_path[PATH_MAX];
+static void *marker_addr;
+
+#ifndef HAVE_GETTID
+static inline pid_t gettid(void)
+{
+ return (pid_t)syscall(__NR_gettid);
+}
+#endif
+
+static int get_e_machine(struct jitheader *hdr)
+{
+ ssize_t sret;
+ char id[16];
+ int fd, ret = -1;
+ struct {
+ uint16_t e_type;
+ uint16_t e_machine;
+ } info;
+
+ fd = open("/proc/self/exe", O_RDONLY);
+ if (fd == -1)
+ return -1;
+
+ sret = read(fd, id, sizeof(id));
+ if (sret != sizeof(id))
+ goto error;
+
+ /* check ELF signature */
+ if (id[0] != 0x7f || id[1] != 'E' || id[2] != 'L' || id[3] != 'F')
+ goto error;
+
+ sret = read(fd, &info, sizeof(info));
+ if (sret != sizeof(info))
+ goto error;
+
+ hdr->elf_mach = info.e_machine;
+ ret = 0;
+error:
+ close(fd);
+ return ret;
+}
+
+static int use_arch_timestamp;
+
+static inline uint64_t
+get_arch_timestamp(void)
+{
+#if defined(__i386__) || defined(__x86_64__)
+ unsigned int low, high;
+
+ asm volatile("rdtsc" : "=a" (low), "=d" (high));
+
+ return low | ((uint64_t)high) << 32;
+#else
+ return 0;
+#endif
+}
+
+#define NSEC_PER_SEC 1000000000
+static int perf_clk_id = CLOCK_MONOTONIC;
+
+static inline uint64_t
+timespec_to_ns(const struct timespec *ts)
+{
+ return ((uint64_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
+}
+
+static inline uint64_t
+perf_get_timestamp(void)
+{
+ struct timespec ts;
+ int ret;
+
+ if (use_arch_timestamp)
+ return get_arch_timestamp();
+
+ ret = clock_gettime(perf_clk_id, &ts);
+ if (ret)
+ return 0;
+
+ return timespec_to_ns(&ts);
+}
+
+static int
+create_jit_cache_dir(void)
+{
+ char str[32];
+ char *base, *p;
+ struct tm tm;
+ time_t t;
+ int ret;
+
+ time(&t);
+ localtime_r(&t, &tm);
+
+ base = getenv("JITDUMPDIR");
+ if (!base)
+ base = getenv("HOME");
+ if (!base)
+ base = ".";
+
+ strftime(str, sizeof(str), JIT_LANG"-jit-%Y%m%d", &tm);
+
+ ret = snprintf(jit_path, PATH_MAX, "%s/.debug/", base);
+ if (ret >= PATH_MAX) {
+ warnx("jvmti: cannot generate jit cache dir because %s/.debug/"
+ " is too long, please check the cwd, JITDUMPDIR, and"
+ " HOME variables", base);
+ return -1;
+ }
+ ret = mkdir(jit_path, 0755);
+ if (ret == -1) {
+ if (errno != EEXIST) {
+ warn("jvmti: cannot create jit cache dir %s", jit_path);
+ return -1;
+ }
+ }
+
+ ret = snprintf(jit_path, PATH_MAX, "%s/.debug/jit", base);
+ if (ret >= PATH_MAX) {
+ warnx("jvmti: cannot generate jit cache dir because"
+ " %s/.debug/jit is too long, please check the cwd,"
+ " JITDUMPDIR, and HOME variables", base);
+ return -1;
+ }
+ ret = mkdir(jit_path, 0755);
+ if (ret == -1) {
+ if (errno != EEXIST) {
+ warn("jvmti: cannot create jit cache dir %s", jit_path);
+ return -1;
+ }
+ }
+
+ ret = snprintf(jit_path, PATH_MAX, "%s/.debug/jit/%s.XXXXXXXX", base, str);
+ if (ret >= PATH_MAX) {
+ warnx("jvmti: cannot generate jit cache dir because"
+ " %s/.debug/jit/%s.XXXXXXXX is too long, please check"
+ " the cwd, JITDUMPDIR, and HOME variables",
+ base, str);
+ return -1;
+ }
+ p = mkdtemp(jit_path);
+ if (p != jit_path) {
+ warn("jvmti: cannot create jit cache dir %s", jit_path);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int
+perf_open_marker_file(int fd)
+{
+ long pgsz;
+
+ pgsz = sysconf(_SC_PAGESIZE);
+ if (pgsz == -1)
+ return -1;
+
+ /*
+ * we mmap the jitdump to create an MMAP RECORD in perf.data file.
+ * The mmap is captured either live (perf record running when we mmap)
+ * or in deferred mode, via /proc/PID/maps
+ * the MMAP record is used as a marker of a jitdump file for more meta
+ * data info about the jitted code. Perf report/annotate detect this
+ * special filename and process the jitdump file.
+ *
+ * mapping must be PROT_EXEC to ensure it is captured by perf record
+ * even when not using -d option
+ */
+ marker_addr = mmap(NULL, pgsz, PROT_READ|PROT_EXEC, MAP_PRIVATE, fd, 0);
+ return (marker_addr == MAP_FAILED) ? -1 : 0;
+}
+
+static void
+perf_close_marker_file(void)
+{
+ long pgsz;
+
+ if (!marker_addr)
+ return;
+
+ pgsz = sysconf(_SC_PAGESIZE);
+ if (pgsz == -1)
+ return;
+
+ munmap(marker_addr, pgsz);
+}
+
+static void
+init_arch_timestamp(void)
+{
+ char *str = getenv("JITDUMP_USE_ARCH_TIMESTAMP");
+
+ if (!str || !*str || !strcmp(str, "0"))
+ return;
+
+ use_arch_timestamp = 1;
+}
+
+void *jvmti_open(void)
+{
+ char dump_path[PATH_MAX];
+ struct jitheader header;
+ int fd, ret;
+ 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));
+
+ /*
+ * jitdump file dir
+ */
+ if (create_jit_cache_dir() < 0)
+ return NULL;
+
+ /*
+ * jitdump file name
+ */
+ ret = snprintf(dump_path, PATH_MAX, "%s/jit-%i.dump", jit_path, getpid());
+ if (ret >= PATH_MAX) {
+ warnx("jvmti: cannot generate jitdump file full path because"
+ " %s/jit-%i.dump is too long, please check the cwd,"
+ " JITDUMPDIR, and HOME variables", jit_path, getpid());
+ return NULL;
+ }
+
+ 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;
+}
+
+int
+jvmti_close(void *agent)
+{
+ struct jr_code_close rec;
+ FILE *fp = agent;
+
+ if (!fp) {
+ warnx("jvmti: invalid 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, multiple 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,
+ int nr_lines, jvmti_line_info_t *li,
+ const char * const * file_names)
+{
+ struct jr_code_debug_info rec;
+ size_t sret, len, size, flen = 0;
+ uint64_t addr;
+ 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;
+ }
+
+ for (i = 0; i < nr_lines; ++i) {
+ flen += strlen(file_names[i]) + 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
+ */
+ size += nr_lines * sizeof(struct debug_entry);
+ size += flen;
+ rec.p.total_size = size;
+
+ /*
+ * If JVM is multi-threaded, multiple 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(file_names[i], strlen(file_names[i]) + 1, 1, fp);
+ if (sret != 1)
+ goto error;
+ }
+ funlockfile(fp);
+ return 0;
+error:
+ funlockfile(fp);
+ return -1;
+}
diff --git a/tools/perf/jvmti/jvmti_agent.h b/tools/perf/jvmti/jvmti_agent.h
new file mode 100644
index 000000000..6ed82f6c0
--- /dev/null
+++ b/tools/perf/jvmti/jvmti_agent.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __JVMTI_AGENT_H__
+#define __JVMTI_AGENT_H__
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <jvmti.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+typedef struct {
+ unsigned long pc;
+ int line_number;
+ int discrim; /* discriminator -- 0 for now */
+ jmethodID methodID;
+} jvmti_line_info_t;
+
+void *jvmti_open(void);
+int jvmti_close(void *agent);
+int jvmti_write_code(void *agent, char const *symbol_name,
+ uint64_t vma, void const *code,
+ const unsigned int code_size);
+
+int jvmti_write_debug_info(void *agent, uint64_t code, int nr_lines,
+ jvmti_line_info_t *li,
+ const char * const * file_names);
+
+#if defined(__cplusplus)
+}
+
+#endif
+#endif /* __JVMTI_H__ */
diff --git a/tools/perf/jvmti/libjvmti.c b/tools/perf/jvmti/libjvmti.c
new file mode 100644
index 000000000..fcca275e5
--- /dev/null
+++ b/tools/perf/jvmti/libjvmti.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/compiler.h>
+#include <linux/string.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <err.h>
+#include <jvmti.h>
+#ifdef HAVE_JVMTI_CMLR
+#include <jvmticmlr.h>
+#endif
+#include <limits.h>
+
+#include "jvmti_agent.h"
+
+static int has_line_numbers;
+void *jvmti_agent;
+
+static void print_error(jvmtiEnv *jvmti, const char *msg, jvmtiError ret)
+{
+ char *err_msg = NULL;
+ jvmtiError err;
+ err = (*jvmti)->GetErrorName(jvmti, ret, &err_msg);
+ if (err == JVMTI_ERROR_NONE) {
+ warnx("%s failed with %s", msg, err_msg);
+ (*jvmti)->Deallocate(jvmti, (unsigned char *)err_msg);
+ } else {
+ warnx("%s failed with an unknown error %d", msg, ret);
+ }
+}
+
+#ifdef HAVE_JVMTI_CMLR
+static jvmtiError
+do_get_line_number(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci,
+ jvmti_line_info_t *tab)
+{
+ jint i, nr_lines = 0;
+ jvmtiLineNumberEntry *loc_tab = NULL;
+ jvmtiError ret;
+ jint src_line = -1;
+
+ ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab);
+ if (ret == JVMTI_ERROR_ABSENT_INFORMATION || ret == JVMTI_ERROR_NATIVE_METHOD) {
+ /* No debug information for this method */
+ return ret;
+ } else if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "GetLineNumberTable", ret);
+ return ret;
+ }
+
+ for (i = 0; i < nr_lines && loc_tab[i].start_location <= bci; i++) {
+ src_line = i;
+ }
+
+ if (src_line != -1) {
+ tab->pc = (unsigned long)pc;
+ tab->line_number = loc_tab[src_line].line_number;
+ tab->discrim = 0; /* not yet used */
+ tab->methodID = m;
+
+ ret = JVMTI_ERROR_NONE;
+ } else {
+ ret = JVMTI_ERROR_ABSENT_INFORMATION;
+ }
+
+ (*jvmti)->Deallocate(jvmti, (unsigned char *)loc_tab);
+
+ return ret;
+}
+
+static jvmtiError
+get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t **tab, int *nr_lines)
+{
+ const jvmtiCompiledMethodLoadRecordHeader *hdr;
+ jvmtiCompiledMethodLoadInlineRecord *rec;
+ PCStackInfo *c;
+ jint 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;
+ nr_total += rec->numpcs;
+ }
+ }
+
+ 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;
+ /*
+ * c->methods is the stack of inlined method calls
+ * at c->pc. [0] is the leaf method. Caller frames
+ * are ignored at the moment.
+ */
+ ret = do_get_line_number(jvmti, c->pc,
+ c->methods[0],
+ c->bcis[0],
+ *tab + lines_total);
+ if (ret == JVMTI_ERROR_NONE)
+ lines_total++;
+ }
+ }
+ }
+ *nr_lines = lines_total;
+ return JVMTI_ERROR_NONE;
+}
+#else /* HAVE_JVMTI_CMLR */
+
+static jvmtiError
+get_line_numbers(jvmtiEnv *jvmti __maybe_unused, const void *compile_info __maybe_unused,
+ jvmti_line_info_t **tab __maybe_unused, int *nr_lines __maybe_unused)
+{
+ return JVMTI_ERROR_NONE;
+}
+#endif /* HAVE_JVMTI_CMLR */
+
+static void
+copy_class_filename(const char * class_sign, const char * file_name, char * result, size_t max_length)
+{
+ /*
+ * 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++)
+ result[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 < (max_length - 1) && file_name && j < strlen(file_name); j++, i++)
+ result[i] = file_name[j];
+
+ result[i] = '\0';
+ } else {
+ /* fallback case */
+ strlcpy(result, file_name, max_length);
+ }
+}
+
+static jvmtiError
+get_source_filename(jvmtiEnv *jvmti, jmethodID methodID, char ** buffer)
+{
+ jvmtiError ret;
+ jclass decl_class;
+ char *file_name = NULL;
+ char *class_sign = NULL;
+ char fn[PATH_MAX];
+ size_t len;
+
+ ret = (*jvmti)->GetMethodDeclaringClass(jvmti, methodID, &decl_class);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "GetMethodDeclaringClass", ret);
+ return ret;
+ }
+
+ ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "GetSourceFileName", ret);
+ return ret;
+ }
+
+ ret = (*jvmti)->GetClassSignature(jvmti, decl_class, &class_sign, NULL);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "GetClassSignature", ret);
+ goto free_file_name_error;
+ }
+
+ copy_class_filename(class_sign, file_name, fn, PATH_MAX);
+ len = strlen(fn);
+ *buffer = malloc((len + 1) * sizeof(char));
+ if (!*buffer) {
+ print_error(jvmti, "GetClassSignature", ret);
+ ret = JVMTI_ERROR_OUT_OF_MEMORY;
+ goto free_class_sign_error;
+ }
+ strcpy(*buffer, fn);
+ ret = JVMTI_ERROR_NONE;
+
+free_class_sign_error:
+ (*jvmti)->Deallocate(jvmti, (unsigned char *)class_sign);
+free_file_name_error:
+ (*jvmti)->Deallocate(jvmti, (unsigned char *)file_name);
+
+ return ret;
+}
+
+static jvmtiError
+fill_source_filenames(jvmtiEnv *jvmti, int nr_lines,
+ const jvmti_line_info_t * line_tab,
+ char ** file_names)
+{
+ int index;
+ jvmtiError ret;
+
+ for (index = 0; index < nr_lines; ++index) {
+ ret = get_source_filename(jvmti, line_tab[index].methodID, &(file_names[index]));
+ if (ret != JVMTI_ERROR_NONE)
+ return ret;
+ }
+
+ 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;
+ char ** line_file_names = NULL;
+ jclass decl_class;
+ char *class_sign = NULL;
+ char *func_name = NULL;
+ char *func_sign = NULL;
+ uint64_t addr = (uint64_t)(uintptr_t)code_addr;
+ jvmtiError ret;
+ int nr_lines = 0; /* in line_tab[] */
+ size_t len;
+ int output_debug_info = 0;
+
+ ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method,
+ &decl_class);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "GetMethodDeclaringClass", ret);
+ return;
+ }
+
+ if (has_line_numbers && map && map_length) {
+ ret = get_line_numbers(jvmti, compile_info, &line_tab, &nr_lines);
+ if (ret != JVMTI_ERROR_NONE) {
+ if (ret != JVMTI_ERROR_NOT_FOUND) {
+ warnx("jvmti: cannot get line table for method");
+ }
+ nr_lines = 0;
+ } else if (nr_lines > 0) {
+ line_file_names = malloc(sizeof(char*) * nr_lines);
+ if (!line_file_names) {
+ warnx("jvmti: cannot allocate space for line table method names");
+ } else {
+ memset(line_file_names, 0, sizeof(char*) * nr_lines);
+ ret = fill_source_filenames(jvmti, nr_lines, line_tab, line_file_names);
+ if (ret != JVMTI_ERROR_NONE) {
+ warnx("jvmti: fill_source_filenames failed");
+ } else {
+ output_debug_info = 1;
+ }
+ }
+ }
+ }
+
+ ret = (*jvmti)->GetClassSignature(jvmti, decl_class,
+ &class_sign, NULL);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "GetClassSignature", ret);
+ goto error;
+ }
+
+ ret = (*jvmti)->GetMethodName(jvmti, method, &func_name,
+ &func_sign, NULL);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "GetMethodName", ret);
+ goto error;
+ }
+
+ /*
+ * write source line info record if we have it
+ */
+ if (output_debug_info)
+ if (jvmti_write_debug_info(jvmti_agent, addr, nr_lines, line_tab, (const char * const *) line_file_names))
+ 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);
+ free(line_tab);
+ while (line_file_names && (nr_lines > 0)) {
+ if (line_file_names[nr_lines - 1]) {
+ free(line_file_names[nr_lines - 1]);
+ }
+ nr_lines -= 1;
+ }
+ free(line_file_names);
+}
+
+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 __maybe_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) {
+ print_error(jvmti, "AddCapabilities", ret);
+ 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;
+ } else if (ret != JVMTI_ERROR_NONE)
+ print_error(jvmti, "GetJLocationFormat", ret);
+
+
+ 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) {
+ print_error(jvmti, "SetEventCallbacks", ret);
+ return -1;
+ }
+
+ ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
+ JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "SetEventNotificationMode(METHOD_LOAD)", ret);
+ return -1;
+ }
+
+ ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
+ JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL);
+ if (ret != JVMTI_ERROR_NONE) {
+ print_error(jvmti, "SetEventNotificationMode(CODE_GENERATED)", ret);
+ return -1;
+ }
+ return 0;
+}
+
+JNIEXPORT void JNICALL
+Agent_OnUnload(JavaVM *jvm __maybe_unused)
+{
+ int ret;
+
+ ret = jvmti_close(jvmti_agent);
+ if (ret)
+ errx(1, "Error: op_close_agent()");
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 20:05:34 +0000