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-rw-r--r--.gitignore5
-rw-r--r--CMakeLists.txt11
-rw-r--r--LICENSE339
-rw-r--r--README53
-rwxr-xr-xjava-objdump.py122
-rw-r--r--methodentry.c194
-rw-r--r--methodentry.h28
-rw-r--r--nativejava.c378
8 files changed, 1130 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4d9344f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+out/
+CMakeFiles/
+CMakeCache.txt
+Makefile
+cmake_install.cmake
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..7e10b66
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,11 @@
+cmake_minimum_required (VERSION 2.6)
+project (native-java-agent)
+
+set(OUTDIR ${PROJECT_BINARY_DIR}/out)
+set(LIBRARY_OUTPUT_PATH ${OUTDIR})
+
+find_package(JNI)
+INCLUDE_DIRECTORIES(${JAVA_INCLUDE_PATH})
+INCLUDE_DIRECTORIES(${JAVA_INCLUDE_PATH2})
+
+add_library(nativejava SHARED nativejava.c methodentry.c methodentry.h)
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
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+
+ b) Accompany it with a written offer, valid for at least three
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+
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+ allowed only for noncommercial distribution and only if you
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+The source code for a work means the preferred form of the work for
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+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
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+However, parties who have received copies, or rights, from you under
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+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
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+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
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+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
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+license would not permit royalty-free redistribution of the Program by
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+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
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+
+It is not the purpose of this section to induce you to infringe any
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+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
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+to distribute software through any other system and a licensee cannot
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+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
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+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
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+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/README b/README
new file mode 100644
index 0000000..1ec1887
--- /dev/null
+++ b/README
@@ -0,0 +1,53 @@
+native-java-agent
+=================
+v0.01 by Steve Capper <steve.capper@linaro.org>
+
+native-java-agent is a library and a Python script that allow Linux
+perf to view information about JIT'ed Java code.
+
+This software acts as a Java Virtual Machine Tools Interface (JVMTI)
+Agent. It is loosely based on perf-map-agent by Johannes Rudolph:
+https://github.com/jrudolph/perf-map-agent
+
+Rather than sample all the function addresses at an instant in time,
+native-java-agent runs throughout the entire workload and captures the
+following as the JVM generates JIT'ed functions:
+ 1) Address offsets and names,
+ 2) Source code filenames, linenumber and bytecode offsets.
+
+Building
+--------
+ cmake .
+ make
+
+
+Recording in Perf
+-----------------
+
+One can invoke perf via:
+
+$ perf record -g java \
+ -agentpath:/full/path/to/libnativejava.so \
+ -jar workload.jar
+
+For JDK9 workloads, I would recommend the following flag be enabled too:
+ -XX:+PreserveFramePointer
+as this will give reliable call stack information.
+
+
+Viewing JIT'ed code in Perf
+---------------------------
+
+One can view JIT'ed code by overriding the default objdump command
+thusly:
+
+$ perf report --objdump=./java-objdump.py
+
+The JAVA_SOURCE_PATH environment variable contains the base paths for
+Java source that java-objdump.py will scan.
+
+Todo
+----
+ * Add attach/detach to already running JVM.
+ * Clean up the Python code a lot!
+ * Test on architectures other than AArch64.
diff --git a/java-objdump.py b/java-objdump.py
new file mode 100755
index 0000000..5a21684
--- /dev/null
+++ b/java-objdump.py
@@ -0,0 +1,122 @@
+#!/usr/bin/python
+
+# native-java-agent
+#
+# Copyright (C) 2015 Linaro Ltd.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# Author: Steve Capper <steve.capper@linaro.org>
+
+import os
+import platform
+import sys
+import re
+import subprocess
+
+def getsourceline (classname, filename, line):
+ searchname = ""
+ for component in classname.split('.')[:-1]:
+ searchname += component + "/"
+
+ searchname += filename
+
+ try:
+ for searchpath in os.environ['JAVA_SOURCE_PATH'].split(':'):
+ fullname = searchpath + "/" + searchname
+
+ if os.path.isfile(fullname):
+ with open(fullname) as f:
+ content = f.readlines()
+ return content[line - 1]
+ except KeyError:
+ pass
+
+ return None
+
+objectname = sys.argv[len(sys.argv) - 1]
+
+if not re.match('/tmp/perf-[0-9]+.map', objectname):
+ newargs = sys.argv
+ newargs[0] = 'objdump'
+ retcode = subprocess.call(newargs)
+ sys.exit(retcode)
+
+objectdir = objectname + '.d'
+
+startaddress = 0
+endaddress = 0
+
+startsmatch = '--start-address='
+stopsmatch = '--stop-address='
+
+for argument in sys.argv:
+ if argument.startswith(startsmatch):
+ startaddress = int(argument[len(startsmatch):], 16)
+
+ elif argument.startswith(stopsmatch):
+ endaddress = int(argument[len(stopsmatch):], 16)
+
+filename = objectdir + '/' + format(startaddress, 'x') + '.dump'
+
+newargs = ['objdump', '-b', 'binary', '--start-address=0x' + format(startaddress, 'x'), \
+ '--stop-address=0x' + format(endaddress, 'x'), \
+ '--adjust-vma=0x' + format(startaddress, 'x'), \
+ '--architecture=' + platform.machine(), '--no-show-raw', '-D', filename]
+
+retproc = subprocess.Popen(newargs, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+outputlines = retproc.stdout.read().splitlines()
+
+midict = {}
+mifilename = objectdir + '/' + format(startaddress, 'x') + '.methodinfo'
+try:
+ with open(mifilename, 'r') as f:
+ milines = f.read().splitlines()
+
+ for miline in milines:
+ sline = miline.split(':')
+ if len(sline) != 6:
+ continue
+
+ pc = int(sline[0], 16)
+
+ if (int(sline[5]) != -1):
+ sourceline = getsourceline(sline[1], sline[2], int(sline[3]))
+ else:
+ sourceline = None
+
+ rhs = sline[1]
+ rhs += " <" + sline[4] + "+" + sline[5] + ">"
+ rhs += " " + sline[2] + ":" + sline[3] + ":"
+
+ if sourceline:
+ rhs += "\n" + sourceline
+
+ if midict.has_key(pc):
+ midict[pc] = rhs + '\n' + midict[pc]
+ else:
+ midict[pc] = rhs
+except IOError:
+ pass
+
+for line in outputlines:
+ sublines = line.split(':')
+ try:
+ pc = int(sublines[0], 16)
+
+ if midict.has_key(pc):
+ print midict[pc]
+ except ValueError:
+ pass
+
+ print line
diff --git a/methodentry.c b/methodentry.c
new file mode 100644
index 0000000..346c164
--- /dev/null
+++ b/methodentry.c
@@ -0,0 +1,194 @@
+/*
+ * native-java-agent
+ *
+ * Copyright (C) 2015 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Steve Capper <steve.capper@linaro.org>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "methodentry.h"
+
+struct methodentry
+{
+ intptr_t start;
+ uintptr_t size;
+ struct methodentry *next;
+ char name[];
+};
+
+static volatile struct methodentry *tail;
+static volatile int methodcount;
+
+/*
+ * We may get multiple calls to me_addmethods from different threads.
+ * So we atomicise access to the methodcount and tail global variables.
+ *
+ * All the rest of the me_ methods are called from a single thread.
+ */
+void me_addmethod(uintptr_t start, uintptr_t size, const char *format, ...)
+{
+ va_list ap;
+ int numchars;
+ struct methodentry *newentry, *expectedtail;
+
+ va_start(ap, format);
+ numchars = vsnprintf(NULL, 0, format, ap);
+ va_end(ap);
+
+ if (numchars <= 0) {
+ fprintf(stderr, "Unexpected error in vsnprintf! ret = %d\n", numchars);
+ return;
+ }
+
+ newentry = malloc(sizeof(struct methodentry) + numchars + 1);
+ if (!newentry) {
+ fprintf(stderr, "FATAL: Unable to allocate space for a methodentry!\n");
+ return;
+ }
+
+ newentry->start = start;
+ newentry->size = size;
+
+ va_start(ap, format);
+ numchars = vsnprintf(newentry->name, numchars + 1, format, ap);
+ va_end(ap);
+
+ if (numchars <= 0) {
+ fprintf(stderr, "Unexpected error in vsnprintf output! ret = %d\n", numchars);
+ free(newentry);
+ return;
+ }
+
+ /*
+ * We only need __ATOMIC_RELAXED below as we are not protecting
+ * access to any resources (i.e. we are not locking), all we want
+ * is atomic update of two variables (tail pointer and count).
+ */
+ while(!__atomic_compare_exchange_n(&tail, &expectedtail, newentry, 0,
+ __ATOMIC_RELAXED, __ATOMIC_RELAXED));
+
+ newentry->next = expectedtail;
+ __atomic_add_fetch(&methodcount, 1, __ATOMIC_RELAXED);
+}
+
+static int comparemethodentries(const void *arg1, const void *arg2)
+{
+ int retval;
+ struct methodentry *entry1 = *(struct methodentry **)arg1;
+ struct methodentry *entry2 = *(struct methodentry **)arg2;
+
+ retval = (int)(entry1->start - entry2->start);
+ if (retval == 0)
+ retval = strcmp(entry1->name, entry2->name);
+
+ return retval;
+}
+
+static void checkforoverlap(struct methodentry **array)
+{
+ int loop;
+ for (loop = 1; loop < methodcount; loop++) {
+ if ((array[loop - 1]->start + array[loop - 1]->size)
+ > array[loop]->start) {
+ fprintf(stderr, "Overlapping found for %s and %s\n",
+ array[loop - 1]->name, array[loop]->name);
+ }
+ }
+}
+
+static void writeoutputfile(struct methodentry **array)
+{
+ FILE *myfile;
+ char *filename;
+ pid_t mypid = getpid();
+ int loop, ret;
+
+ ret = asprintf(&filename, "/tmp/perf-%d.map", mypid);
+ if (ret == -1) {
+ fprintf(stderr, "Unable to allocate space for filename: %s\n", strerror(errno));
+ return;
+ }
+
+ myfile = fopen(filename, "w");
+ if (!myfile) {
+ fprintf(stderr, "Unable to open %s for writing\n", filename);
+ goto out;
+ }
+
+ for (loop = 0; loop < methodcount; loop++) {
+ fprintf(myfile, "%lx %x %s\n", array[loop]->start,
+ array[loop]->size, array[loop]->name);
+ }
+
+ fclose(myfile);
+ fprintf(stderr, "Native codegen data written out to: %s\n", filename);
+out:
+ free(filename);
+}
+
+void me_outputperfmap(void)
+{
+ int loop;
+ struct methodentry *current = (struct methodentry *) tail;
+ struct methodentry **array;
+
+ if (!methodcount) {
+ fprintf(stderr, "No native code was generated, finishing...\n");
+ return;
+ }
+
+ array = malloc(sizeof(struct methodentry *) * methodcount);
+ if (!array) {
+ fprintf(stderr, "Unable to allocate array!\n");
+ return;
+ }
+
+ for (loop = 0; loop < methodcount; loop++) {
+ array[loop] = current;
+ current = current->next;
+ }
+
+ qsort(array, methodcount, sizeof(array[0]), comparemethodentries);
+
+ checkforoverlap(array);
+
+ writeoutputfile(array);
+
+ free(array);
+}
+
+void me_freemethodentries(void)
+{
+ struct methodentry *next = (struct methodentry *) tail;
+ tail = NULL;
+
+ while(next) {
+ struct methodentry *freeme = next;
+ next = next->next;
+ free(freeme);
+ --methodcount;
+ }
+
+ if (methodcount) {
+ fprintf(stderr, "Unexpected number of unfreed methodentries = %d\n", methodcount);
+ }
+}
diff --git a/methodentry.h b/methodentry.h
new file mode 100644
index 0000000..715042c
--- /dev/null
+++ b/methodentry.h
@@ -0,0 +1,28 @@
+/*
+ * native-java-agent
+ *
+ * Copyright (C) 2015 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Steve Capper <steve.capper@linaro.org>
+ */
+
+#ifndef _METHODENTRY_H_
+#define _METHODENTRY_H_
+
+void me_addmethod(uintptr_t start, uintptr_t size, const char *format, ...);
+void me_outputperfmap(void);
+void me_freemethodentries(void);
+
+#endif /* _METHODENTRY_H_ */
diff --git a/nativejava.c b/nativejava.c
new file mode 100644
index 0000000..fb4a545
--- /dev/null
+++ b/nativejava.c
@@ -0,0 +1,378 @@
+/*
+ * native-java-agent
+ *
+ * Copyright (C) 2015 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Steve Capper <steve.capper@linaro.org>
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <jni.h>
+#include <jvmti.h>
+#include <jvmticmlr.h>
+
+#include "methodentry.h"
+
+#define CHECKBADRET(x, y) tires = x; if(tires) \
+ { fprintf(stderr, "Unexpected return code from " #x ", on line %d got %d back\n", __LINE__, tires); \
+ return y; }
+
+static void getclassname(jvmtiEnv *jvmti, jclass klass, char **name)
+{
+ char *classname;
+ int ret, loop;
+ jvmtiError tires;
+ *name = NULL;
+
+ CHECKBADRET((*jvmti)->GetClassSignature(jvmti, klass, &classname, NULL),);
+
+ for (loop = 1; loop < strlen(classname); loop++) {
+ if (classname[loop] == '/')
+ classname[loop] = '.';
+ else if (classname[loop] == ';')
+ classname[loop] = '\0';
+ }
+
+ ret = asprintf(name, "%s", classname + 1);
+ if (ret == -1) {
+ fprintf(stderr, "Unable to allocate space for classname: %s\n",
+ strerror(errno));
+ *name = NULL;
+ }
+
+ CHECKBADRET((*jvmti)->Deallocate(jvmti, classname),);
+}
+
+void decodelinenumber(jvmtiEnv *jvmti, FILE *output, jmethodID method, jint bci,
+ const void *pc)
+{
+ jclass klass;
+ jvmtiError tires;
+ jint table_entry_count;
+ jvmtiLineNumberEntry *linetable;
+ char *methodname, *source_file_name, *classname;
+ int tloop;
+
+ CHECKBADRET((*jvmti)->GetMethodName(jvmti, method, &methodname, NULL, NULL),);
+ CHECKBADRET((*jvmti)->GetMethodDeclaringClass(jvmti, method, &klass),);
+ CHECKBADRET((*jvmti)->GetSourceFileName(jvmti, klass, &source_file_name),);
+
+ CHECKBADRET((*jvmti)->GetLineNumberTable(jvmti, method, &table_entry_count,
+ &linetable),);
+
+ for(tloop = 1; tloop < table_entry_count; tloop++) {
+ if (linetable[tloop].start_location > bci)
+ break;
+ }
+
+ getclassname(jvmti, klass, &classname);
+
+ fprintf(output, "0x%llx:%s:%s:%d:%s:%d\n", pc, classname, source_file_name,
+ (bci == -1) ? 0 : linetable[tloop - 1].line_number,
+ methodname, bci);
+ free(classname);
+
+ CHECKBADRET((*jvmti)->Deallocate(jvmti, source_file_name),);
+ CHECKBADRET((*jvmti)->Deallocate(jvmti, (unsigned char*)linetable),);
+ CHECKBADRET((*jvmti)->Deallocate(jvmti, methodname),);
+}
+
+void analyseinline(jvmtiEnv *jvmti, FILE *output, PCStackInfo *stack)
+{
+ int loop;
+ for (loop = 0; loop < stack->numstackframes; loop++) {
+ decodelinenumber(jvmti, output, stack->methods[loop],
+ stack->bcis[loop], stack->pc);
+ }
+}
+
+void analysecompileinfo(jvmtiEnv *jvmti, const void *code_addr,
+ const char *name, const void *compile_info)
+{
+ int current = 0;
+ char *filename;
+ FILE *output;
+ int res = asprintf(&filename, "/tmp/perf-%d.map.d/%lx.methodinfo",
+ getpid(), (uintptr_t)code_addr);
+ if (res == -1) {
+ fprintf(stderr, "Couldn't allocate string %s\n",
+ strerror(errno));
+ return;
+ }
+
+ output = fopen(filename, "w");
+ if (!output) {
+ fprintf(stderr, "Unable to create %s\n", filename);
+ goto out;
+ }
+
+ jvmtiCompiledMethodLoadRecordHeader *head =
+ (jvmtiCompiledMethodLoadRecordHeader *) compile_info;
+
+ while(head) {
+ switch(head->kind) {
+ case JVMTI_CMLR_DUMMY:
+ {
+ jvmtiCompiledMethodLoadDummyRecord *dummy =
+ (jvmtiCompiledMethodLoadDummyRecord *)head;
+ fprintf(output, "Type dummy: %s\n", dummy->message);
+ break;
+ }
+
+ case JVMTI_CMLR_INLINE_INFO:
+ {
+ int loop;
+ jvmtiCompiledMethodLoadInlineRecord *in =
+ (jvmtiCompiledMethodLoadInlineRecord *)head;
+ for (loop = 0; loop < in->numpcs; loop++) {
+ analyseinline(jvmti, output, &in->pcinfo[loop]);
+ }
+ break;
+ }
+ default:
+ fprintf(output, "Unknown compile_info type: %d\n", head->kind);
+ }
+
+ head = head->next;
+ ++current;
+ }
+
+ fclose(output);
+out:
+ free(filename);
+}
+
+static void dumpdata(const void *code_addr, jint code_size)
+{
+ char *filename;
+ FILE *output;
+ size_t written;
+ int res = asprintf(&filename, "/tmp/perf-%d.map.d/%lx.dump", getpid(),
+ (uintptr_t)code_addr);
+ if (res == -1) {
+ fprintf(stderr, "Couldn't allocate string %s\n", strerror(errno));
+ return;
+ }
+
+ output = fopen(filename, "wb");
+ if (!output) {
+ fprintf(stderr, "Unable to create %s\n", filename);
+ goto out;
+ }
+
+ written = fwrite(code_addr, code_size, 1, output);
+ if (written != 1)
+ fprintf(stderr, "Unable to write %d bytes to %s\n",
+ code_size, filename);
+ fclose(output);
+
+out:
+ free(filename);
+}
+
+static void _CompiledMethodLoad(jvmtiEnv *jvmti,
+ jmethodID method,
+ jint code_size,
+ const void* code_addr,
+ jint map_length,
+ const jvmtiAddrLocationMap* map,
+ const void* compile_info)
+{
+ char *name, *classname;
+ jclass klass;
+
+ jvmtiError tires;
+
+ dumpdata(code_addr, code_size);
+
+ CHECKBADRET((*jvmti)->GetMethodName(jvmti, method, &name, NULL, NULL),);
+
+ analysecompileinfo(jvmti, code_addr, name, compile_info);
+
+ CHECKBADRET((*jvmti)->GetMethodDeclaringClass(jvmti, method, &klass),);
+ getclassname(jvmti, klass, &classname);
+
+ me_addmethod((int64_t)code_addr, code_size, "%s:%s", classname, name);
+
+ CHECKBADRET((*jvmti)->Deallocate(jvmti, name),);
+}
+
+static void _DynamicCodeGenerated(jvmtiEnv *jvmti_env,
+ const char* name,
+ const void* address,
+ jint length)
+{
+ dumpdata(address, length);
+ me_addmethod((int64_t) address, length, "%s DYNAMIC", name);
+}
+
+
+/*
+ * The JVM will fire DynamicCodeGenerated and CompileMethodInfo events from
+ * multiple threads. It will then fire a VMDeath event just before shutdown,
+ * and we need to block in VMDeath until all our previous events have completed.
+ * Also, we want to check for events fired after we have finished with VMDeath
+ * as this means we've forgotten to call SetEventNotificationMode and
+ * deactivate the events.
+ *
+ * This logic is achieved with a basic integer count of active threads.
+ * If this count is >0, that is the number of events being actively processed.
+ * If the count is 0 then we can proceed through VMDeath.
+ * After VMDeath, count is INT_MIN meaning that any events that fire detect
+ * a negative count and show an error.
+ */
+
+static volatile int _agentsactive;
+
+static inline int incrementagents(void)
+{
+ return __atomic_add_fetch(&_agentsactive, 1, __ATOMIC_ACQUIRE);
+}
+
+static inline void decrementagents(void)
+{
+ __atomic_sub_fetch(&_agentsactive, 1, __ATOMIC_RELEASE);
+}
+
+void JNICALL
+DynamicCodeGenerated(jvmtiEnv *jvmti_env,
+ const char* name,
+ const void* address,
+ jint length)
+{
+ if (incrementagents() < 0) {
+ fprintf(stderr, "Unexpected shutdown received before dynamic code could start\n");
+ return;
+ }
+ _DynamicCodeGenerated(jvmti_env, name, address, length);
+ decrementagents();
+}
+
+void JNICALL
+CompiledMethodLoad(jvmtiEnv *jvmti,
+ jmethodID method,
+ jint code_size,
+ const void* code_addr,
+ jint map_length,
+ const jvmtiAddrLocationMap* map,
+ const void* compile_info)
+{
+ if (incrementagents() < 0) {
+ fprintf(stderr, "Unexpected shutdown received before methodload could start\n");
+ return;
+ }
+
+ _CompiledMethodLoad(jvmti, method, code_size, code_addr,
+ map_length, map, compile_info);
+ decrementagents();
+}
+
+void JNICALL
+VMDeath(jvmtiEnv *jvmti,
+ JNIEnv* jni_env)
+{
+ int expected = 0;
+ jvmtiError tires;
+
+ CHECKBADRET((*jvmti)->SetEventNotificationMode(jvmti, JVMTI_DISABLE, JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL),);
+ CHECKBADRET((*jvmti)->SetEventNotificationMode(jvmti, JVMTI_DISABLE, JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL),);
+
+ /* spin until we've finished decoding everything */
+ while(!__atomic_compare_exchange_n(&_agentsactive, &expected, INT_MIN,
+ 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) {
+ expected = 0;
+ }
+}
+
+
+/*
+ * Entry point, get everything ready for our tracing.
+ */
+JNIEXPORT jint JNICALL
+Agent_OnLoad(JavaVM* vm, char *options, void *reserved)
+
+{
+ jvmtiEnv *jvmti;
+ jvmtiError tires;
+ pid_t pid;
+ char *dirname;
+ int md, ret;
+
+ jvmtiEventCallbacks mycallbacks = {
+ .CompiledMethodLoad = CompiledMethodLoad,
+ .DynamicCodeGenerated = DynamicCodeGenerated,
+ .VMDeath = VMDeath,
+ };
+
+ jvmtiCapabilities mycapabilities = {
+ .can_generate_compiled_method_load_events = 1,
+ .can_get_line_numbers = 1,
+ .can_get_source_file_name = 1
+ };
+
+ jint eres = (*vm)->GetEnv(vm, (void **) &jvmti, JVMTI_VERSION_1_0);
+ if (eres) {
+ fprintf(stderr, "Unable to hook into JVMTI, error code = 0x%x\n", eres);
+ return eres;
+ }
+
+ CHECKBADRET((*jvmti)->SetEventCallbacks(jvmti, &mycallbacks, sizeof(mycallbacks)), -1);
+ CHECKBADRET((*jvmti)->AddCapabilities(jvmti, &mycapabilities), -2);
+ CHECKBADRET((*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL), -3);
+ CHECKBADRET((*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL), -4);
+ CHECKBADRET((*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_VM_DEATH, NULL), -5);
+
+ pid = getpid();
+ ret = asprintf(&dirname, "/tmp/perf-%d.map.d/", pid);
+
+ if (ret == -1) {
+ fprintf(stderr, "Couldn't allocate string %s\n",
+ strerror(errno));
+ return -6;
+ }
+
+ md = mkdir(dirname, 0700);
+ if (md) {
+ fprintf(stderr, "Unable to create directory %s - %s\n", dirname, strerror(errno));
+ return -7;
+ }
+
+ free(dirname);
+ fprintf(stderr, "native-java-agent v0.01 tracking codegen...\n");
+ return 0;
+}
+
+/*
+ * We are being unloaded from the JVM, dump out perf map
+ * and free everything up.
+ */
+JNIEXPORT void JNICALL
+Agent_OnUnload(JavaVM *vm)
+{
+ me_outputperfmap();
+ me_freemethodentries();
+}