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android / platform / dalvik / 9907ca3cb8982063a846426ad3bdf3f90e3b87c2 / . / vm / Init.cpp
blob: 35c10857911c2ea339dc4914639f688661c9f692 [file] [log] [blame]
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Dalvik initialization, shutdown, and command-line argument processing.
*/
#define __STDC_LIMIT_MACROS
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <limits.h>
#include <ctype.h>
#include <sys/mount.h>
#include <sys/wait.h>
#include <linux/fs.h>
#include <cutils/fs.h>
#include <unistd.h>
#include "Dalvik.h"
#include "test/Test.h"
#include "mterp/Mterp.h"
#include "Hash.h"
#if defined(WITH_JIT)
#include "compiler/codegen/Optimizer.h"
#endif
#define kMinHeapStartSize (1*1024*1024)
#define kMinHeapSize (2*1024*1024)
#define kMaxHeapSize (1*1024*1024*1024)
/*
* Register VM-agnostic native methods for system classes.
*/
extern int jniRegisterSystemMethods(JNIEnv* env);
/* fwd */
static bool registerSystemNatives(JNIEnv* pEnv);
static bool initJdwp();
static bool initZygote();
/* global state */
struct DvmGlobals gDvm;
struct DvmJniGlobals gDvmJni;
/* JIT-specific global state */
#if defined(WITH_JIT)
struct DvmJitGlobals gDvmJit;
#if defined(WITH_JIT_TUNING)
/*
* Track the number of hits in the inline cache for predicted chaining.
* Use an ugly global variable here since it is accessed in assembly code.
*/
int gDvmICHitCount;
#endif
#endif
/*
* Show usage.
*
* We follow the tradition of unhyphenated compound words.
*/
static void usage(const char* progName)
{
dvmFprintf(stderr, "%s: [options] class [argument ...]\n", progName);
dvmFprintf(stderr, "%s: [options] -jar file.jar [argument ...]\n",progName);
dvmFprintf(stderr, "\n");
dvmFprintf(stderr, "The following standard options are recognized:\n");
dvmFprintf(stderr, " -classpath classpath\n");
dvmFprintf(stderr, " -Dproperty=value\n");
dvmFprintf(stderr, " -verbose:tag ('gc', 'jni', or 'class')\n");
dvmFprintf(stderr, " -ea[:<package name>... |:<class name>]\n");
dvmFprintf(stderr, " -da[:<package name>... |:<class name>]\n");
dvmFprintf(stderr, " (-enableassertions, -disableassertions)\n");
dvmFprintf(stderr, " -esa\n");
dvmFprintf(stderr, " -dsa\n");
dvmFprintf(stderr,
" (-enablesystemassertions, -disablesystemassertions)\n");
dvmFprintf(stderr, " -showversion\n");
dvmFprintf(stderr, " -help\n");
dvmFprintf(stderr, "\n");
dvmFprintf(stderr, "The following extended options are recognized:\n");
dvmFprintf(stderr, " -Xrunjdwp:<options>\n");
dvmFprintf(stderr, " -Xbootclasspath:bootclasspath\n");
dvmFprintf(stderr, " -Xcheck:tag (e.g. 'jni')\n");
dvmFprintf(stderr, " -XmsN (min heap, must be multiple of 1K, >= 1MB)\n");
dvmFprintf(stderr, " -XmxN (max heap, must be multiple of 1K, >= 2MB)\n");
dvmFprintf(stderr, " -XssN (stack size, >= %dKB, <= %dKB)\n",
kMinStackSize / 1024, kMaxStackSize / 1024);
dvmFprintf(stderr, " -Xverify:{none,remote,all}\n");
dvmFprintf(stderr, " -Xrs\n");
#if defined(WITH_JIT)
dvmFprintf(stderr,
" -Xint (extended to accept ':portable', ':fast' and ':jit')\n");
#else
dvmFprintf(stderr,
" -Xint (extended to accept ':portable' and ':fast')\n");
#endif
dvmFprintf(stderr, "\n");
dvmFprintf(stderr, "These are unique to Dalvik:\n");
dvmFprintf(stderr, " -Xzygote\n");
dvmFprintf(stderr, " -Xdexopt:{none,verified,all,full}\n");
dvmFprintf(stderr, " -Xnoquithandler\n");
dvmFprintf(stderr,
" -Xjnigreflimit:N (must be multiple of 100, >= 200)\n");
dvmFprintf(stderr, " -Xjniopts:{warnonly,forcecopy}\n");
dvmFprintf(stderr, " -Xjnitrace:substring (eg NativeClass or nativeMethod)\n");
dvmFprintf(stderr, " -Xstacktracefile:<filename>\n");
dvmFprintf(stderr, " -Xgc:[no]precise\n");
dvmFprintf(stderr, " -Xgc:[no]preverify\n");
dvmFprintf(stderr, " -Xgc:[no]postverify\n");
dvmFprintf(stderr, " -Xgc:[no]concurrent\n");
dvmFprintf(stderr, " -Xgc:[no]verifycardtable\n");
dvmFprintf(stderr, " -XX:+DisableExplicitGC\n");
dvmFprintf(stderr, " -X[no]genregmap\n");
dvmFprintf(stderr, " -Xverifyopt:[no]checkmon\n");
dvmFprintf(stderr, " -Xcheckdexsum\n");
#if defined(WITH_JIT)
dvmFprintf(stderr, " -Xincludeselectedop\n");
dvmFprintf(stderr, " -Xjitop:hexopvalue[-endvalue]"
"[,hexopvalue[-endvalue]]*\n");
dvmFprintf(stderr, " -Xincludeselectedmethod\n");
dvmFprintf(stderr, " -Xjitthreshold:decimalvalue\n");
dvmFprintf(stderr, " -Xjitblocking\n");
dvmFprintf(stderr, " -Xjitmethod:signature[,signature]* "
"(eg Ljava/lang/String\\;replace)\n");
dvmFprintf(stderr, " -Xjitclass:classname[,classname]*\n");
dvmFprintf(stderr, " -Xjitoffset:offset[,offset]\n");
dvmFprintf(stderr, " -Xjitconfig:filename\n");
dvmFprintf(stderr, " -Xjitcheckcg\n");
dvmFprintf(stderr, " -Xjitverbose\n");
dvmFprintf(stderr, " -Xjitprofile\n");
dvmFprintf(stderr, " -Xjitdisableopt\n");
dvmFprintf(stderr, " -Xjitsuspendpoll\n");
#endif
dvmFprintf(stderr, "\n");
dvmFprintf(stderr, "Configured with:"
" debugger"
" profiler"
" hprof"
#ifdef WITH_TRACKREF_CHECKS
" trackref_checks"
#endif
#ifdef WITH_INSTR_CHECKS
" instr_checks"
#endif
#ifdef WITH_EXTRA_OBJECT_VALIDATION
" extra_object_validation"
#endif
#ifdef WITH_EXTRA_GC_CHECKS
" extra_gc_checks"
#endif
#if !defined(NDEBUG) && defined(WITH_DALVIK_ASSERT)
" dalvik_assert"
#endif
#ifdef WITH_JNI_STACK_CHECK
" jni_stack_check"
#endif
#ifdef EASY_GDB
" easy_gdb"
#endif
#ifdef CHECK_MUTEX
" check_mutex"
#endif
#if defined(WITH_JIT)
" jit(" ARCH_VARIANT ")"
#endif
#if defined(WITH_SELF_VERIFICATION)
" self_verification"
#endif
#if ANDROID_SMP != 0
" smp"
#endif
);
#ifdef DVM_SHOW_EXCEPTION
dvmFprintf(stderr, " show_exception=%d", DVM_SHOW_EXCEPTION);
#endif
dvmFprintf(stderr, "\n\n");
}
/*
* Show helpful information on JDWP options.
*/
static void showJdwpHelp()
{
dvmFprintf(stderr,
"Example: -Xrunjdwp:transport=dt_socket,address=8000,server=y\n");
dvmFprintf(stderr,
"Example: -Xrunjdwp:transport=dt_socket,address=localhost:6500,server=n\n");
}
/*
* Show version and copyright info.
*/
static void showVersion()
{
dvmFprintf(stdout, "DalvikVM version %d.%d.%d\n",
DALVIK_MAJOR_VERSION, DALVIK_MINOR_VERSION, DALVIK_BUG_VERSION);
dvmFprintf(stdout,
"Copyright (C) 2007 The Android Open Source Project\n\n"
"This software is built from source code licensed under the "
"Apache License,\n"
"Version 2.0 (the \"License\"). You may obtain a copy of the "
"License at\n\n"
" http://www.apache.org/licenses/LICENSE-2.0\n\n"
"See the associated NOTICE file for this software for further "
"details.\n");
}
/*
* Parse a string of the form /[0-9]+[kKmMgG]?/, which is used to specify
* memory sizes. [kK] indicates kilobytes, [mM] megabytes, and
* [gG] gigabytes.
*
* "s" should point just past the "-Xm?" part of the string.
* "min" specifies the lowest acceptable value described by "s".
* "div" specifies a divisor, e.g. 1024 if the value must be a multiple
* of 1024.
*
* The spec says the -Xmx and -Xms options must be multiples of 1024. It
* doesn't say anything about -Xss.
*
* Returns 0 (a useless size) if "s" is malformed or specifies a low or
* non-evenly-divisible value.
*/
static size_t parseMemOption(const char* s, size_t div)
{
/* strtoul accepts a leading [+-], which we don't want,
* so make sure our string starts with a decimal digit.
*/
if (isdigit(*s)) {
const char* s2;
size_t val;
val = strtoul(s, (char* *)&s2, 10);
if (s2 != s) {
/* s2 should be pointing just after the number.
* If this is the end of the string, the user
* has specified a number of bytes. Otherwise,
* there should be exactly one more character
* that specifies a multiplier.
*/
if (*s2 != '\0') {
char c;
/* The remainder of the string is either a single multiplier
* character, or nothing to indicate that the value is in
* bytes.
*/
c = *s2++;
if (*s2 == '\0') {
size_t mul;
if (c == '\0') {
mul = 1;
} else if (c == 'k' || c == 'K') {
mul = 1024;
} else if (c == 'm' || c == 'M') {
mul = 1024 * 1024;
} else if (c == 'g' || c == 'G') {
mul = 1024 * 1024 * 1024;
} else {
/* Unknown multiplier character.
*/
return 0;
}
if (val <= SIZE_MAX / mul) {
val *= mul;
} else {
/* Clamp to a multiple of 1024.
*/
val = SIZE_MAX & ~(1024-1);
}
} else {
/* There's more than one character after the
* numeric part.
*/
return 0;
}
}
/* The man page says that a -Xm value must be
* a multiple of 1024.
*/
if (val % div == 0) {
return val;
}
}
}
return 0;
}
/*
* Handle one of the JDWP name/value pairs.
*
* JDWP options are:
* help: if specified, show help message and bail
* transport: may be dt_socket or dt_shmem
* address: for dt_socket, "host:port", or just "port" when listening
* server: if "y", wait for debugger to attach; if "n", attach to debugger
* timeout: how long to wait for debugger to connect / listen
*
* Useful with server=n (these aren't supported yet):
* onthrow=<exception-name>: connect to debugger when exception thrown
* onuncaught=y|n: connect to debugger when uncaught exception thrown
* launch=<command-line>: launch the debugger itself
*
* The "transport" option is required, as is "address" if server=n.
*/
static bool handleJdwpOption(const char* name, const char* value)
{
if (strcmp(name, "transport") == 0) {
if (strcmp(value, "dt_socket") == 0) {
gDvm.jdwpTransport = kJdwpTransportSocket;
} else if (strcmp(value, "dt_android_adb") == 0) {
gDvm.jdwpTransport = kJdwpTransportAndroidAdb;
} else {
ALOGE("JDWP transport '%s' not supported", value);
return false;
}
} else if (strcmp(name, "server") == 0) {
if (*value == 'n')
gDvm.jdwpServer = false;
else if (*value == 'y')
gDvm.jdwpServer = true;
else {
ALOGE("JDWP option 'server' must be 'y' or 'n'");
return false;
}
} else if (strcmp(name, "suspend") == 0) {
if (*value == 'n')
gDvm.jdwpSuspend = false;
else if (*value == 'y')
gDvm.jdwpSuspend = true;
else {
ALOGE("JDWP option 'suspend' must be 'y' or 'n'");
return false;
}
} else if (strcmp(name, "address") == 0) {
/* this is either <port> or <host>:<port> */
const char* colon = strchr(value, ':');
char* end;
long port;
if (colon != NULL) {
free(gDvm.jdwpHost);
gDvm.jdwpHost = (char*) malloc(colon - value +1);
strncpy(gDvm.jdwpHost, value, colon - value +1);
gDvm.jdwpHost[colon-value] = '\0';
value = colon + 1;
}
if (*value == '\0') {
ALOGE("JDWP address missing port");
return false;
}
port = strtol(value, &end, 10);
if (*end != '\0') {
ALOGE("JDWP address has junk in port field '%s'", value);
return false;
}
gDvm.jdwpPort = port;
} else if (strcmp(name, "launch") == 0 ||
strcmp(name, "onthrow") == 0 ||
strcmp(name, "oncaught") == 0 ||
strcmp(name, "timeout") == 0)
{
/* valid but unsupported */
ALOGI("Ignoring JDWP option '%s'='%s'", name, value);
} else {
ALOGI("Ignoring unrecognized JDWP option '%s'='%s'", name, value);
}
return true;
}
/*
* Parse the latter half of a -Xrunjdwp/-agentlib:jdwp= string, e.g.:
* "transport=dt_socket,address=8000,server=y,suspend=n"
*/
static bool parseJdwpOptions(const char* str)
{
char* mangle = strdup(str);
char* name = mangle;
bool result = false;
/*
* Process all of the name=value pairs.
*/
while (true) {
char* value;
char* comma;
value = strchr(name, '=');
if (value == NULL) {
ALOGE("JDWP opts: garbage at '%s'", name);
goto bail;
}
comma = strchr(name, ','); // use name, not value, for safety
if (comma != NULL) {
if (comma < value) {
ALOGE("JDWP opts: found comma before '=' in '%s'", mangle);
goto bail;
}
*comma = '\0';
}
*value++ = '\0'; // stomp the '='
if (!handleJdwpOption(name, value))
goto bail;
if (comma == NULL) {
/* out of options */
break;
}
name = comma+1;
}
/*
* Make sure the combination of arguments makes sense.
*/
if (gDvm.jdwpTransport == kJdwpTransportUnknown) {
ALOGE("JDWP opts: must specify transport");
goto bail;
}
if (!gDvm.jdwpServer && (gDvm.jdwpHost == NULL || gDvm.jdwpPort == 0)) {
ALOGE("JDWP opts: when server=n, must specify host and port");
goto bail;
}
// transport mandatory
// outbound server address
gDvm.jdwpConfigured = true;
result = true;
bail:
free(mangle);
return result;
}
/*
* Handle one of the four kinds of assertion arguments.
*
* "pkgOrClass" is the last part of an enable/disable line. For a package
* the arg looks like "-ea:com.google.fubar...", for a class it looks
* like "-ea:com.google.fubar.Wahoo". The string we get starts at the ':'.
*
* For system assertions (-esa/-dsa), "pkgOrClass" is NULL.
*
* Multiple instances of these arguments can be specified, e.g. you can
* enable assertions for a package and then disable them for one class in
* the package.
*/
static bool enableAssertions(const char* pkgOrClass, bool enable)
{
AssertionControl* pCtrl = &gDvm.assertionCtrl[gDvm.assertionCtrlCount++];
pCtrl->enable = enable;
if (pkgOrClass == NULL) {
/* enable or disable for all system classes */
pCtrl->isPackage = false;
pCtrl->pkgOrClass = NULL;
pCtrl->pkgOrClassLen = 0;
} else {
if (*pkgOrClass == '\0') {
/* global enable/disable for all but system */
pCtrl->isPackage = false;
pCtrl->pkgOrClass = strdup("");
pCtrl->pkgOrClassLen = 0;
} else {
pCtrl->pkgOrClass = dvmDotToSlash(pkgOrClass+1); // skip ':'
if (pCtrl->pkgOrClass == NULL) {
/* can happen if class name includes an illegal '/' */
ALOGW("Unable to process assertion arg '%s'", pkgOrClass);
return false;
}
int len = strlen(pCtrl->pkgOrClass);
if (len >= 3 && strcmp(pCtrl->pkgOrClass + len-3, "///") == 0) {
/* mark as package, truncate two of the three slashes */
pCtrl->isPackage = true;
*(pCtrl->pkgOrClass + len-2) = '\0';
pCtrl->pkgOrClassLen = len - 2;
} else {
/* just a class */
pCtrl->isPackage = false;
pCtrl->pkgOrClassLen = len;
}
}
}
return true;
}
/*
* Turn assertions on when requested to do so by the Zygote.
*
* This is a bit sketchy. We can't (easily) go back and fiddle with all
* of the classes that have already been initialized, so this only
* affects classes that have yet to be loaded. If some or all assertions
* have been enabled through some other means, we don't want to mess with
* it here, so we do nothing. Finally, we assume that there's room in
* "assertionCtrl" to hold at least one entry; this is guaranteed by the
* allocator.
*
* This must only be called from the main thread during zygote init.
*/
void dvmLateEnableAssertions()
{
if (gDvm.assertionCtrl == NULL) {
ALOGD("Not late-enabling assertions: no assertionCtrl array");
return;
} else if (gDvm.assertionCtrlCount != 0) {
ALOGD("Not late-enabling assertions: some asserts already configured");
return;
}
ALOGD("Late-enabling assertions");
/* global enable for all but system */
AssertionControl* pCtrl = gDvm.assertionCtrl;
pCtrl->pkgOrClass = strdup("");
pCtrl->pkgOrClassLen = 0;
pCtrl->isPackage = false;
pCtrl->enable = true;
gDvm.assertionCtrlCount = 1;
}
/*
* Release memory associated with the AssertionCtrl array.
*/
static void freeAssertionCtrl()
{
int i;
for (i = 0; i < gDvm.assertionCtrlCount; i++)
free(gDvm.assertionCtrl[i].pkgOrClass);
free(gDvm.assertionCtrl);
}
#if defined(WITH_JIT)
/* Parse -Xjitop to selectively turn on/off certain opcodes for JIT */
static void processXjitop(const char* opt)
{
if (opt[7] == ':') {
const char* startPtr = &opt[8];
char* endPtr = NULL;
do {
long startValue, endValue;
startValue = strtol(startPtr, &endPtr, 16);
if (startPtr != endPtr) {
/* Just in case value is out of range */
startValue %= kNumPackedOpcodes;
if (*endPtr == '-') {
endValue = strtol(endPtr+1, &endPtr, 16);
endValue %= kNumPackedOpcodes;
} else {
endValue = startValue;
}
for (; startValue <= endValue; startValue++) {
ALOGW("Dalvik opcode %x is selected for debugging",
(unsigned int) startValue);
/* Mark the corresponding bit to 1 */
gDvmJit.opList[startValue >> 3] |= 1 << (startValue & 0x7);
}
if (*endPtr == 0) {
break;
}
startPtr = endPtr + 1;
continue;
} else {
if (*endPtr != 0) {
dvmFprintf(stderr,
"Warning: Unrecognized opcode value substring "
"%s\n", endPtr);
}
break;
}
} while (1);
} else {
int i;
for (i = 0; i < (kNumPackedOpcodes+7)/8; i++) {
gDvmJit.opList[i] = 0xff;
}
dvmFprintf(stderr, "Warning: select all opcodes\n");
}
}
/* Parse -Xjitoffset to selectively turn on/off traces with certain offsets for JIT */
static void processXjitoffset(const char* opt) {
gDvmJit.num_entries_pcTable = 0;
char* buf = strdup(opt);
char* start, *end;
start = buf;
int idx = 0;
do {
end = strchr(start, ',');
if (end) {
*end = 0;
}
dvmFprintf(stderr, "processXjitoffset start = %s\n", start);
char* tmp = strdup(start);
gDvmJit.pcTable[idx++] = atoi(tmp);
free(tmp);
if (idx >= COMPILER_PC_OFFSET_SIZE) {
dvmFprintf(stderr, "processXjitoffset: ignore entries beyond %d\n", COMPILER_PC_OFFSET_SIZE);
break;
}
if (end) {
start = end + 1;
} else {
break;
}
} while (1);
gDvmJit.num_entries_pcTable = idx;
free(buf);
}
/* Parse -Xjitmethod to selectively turn on/off certain methods for JIT */
static void processXjitmethod(const char* opt, bool isMethod) {
char* buf = strdup(opt);
if (isMethod && gDvmJit.methodTable == NULL) {
gDvmJit.methodTable = dvmHashTableCreate(8, NULL);
}
if (!isMethod && gDvmJit.classTable == NULL) {
gDvmJit.classTable = dvmHashTableCreate(8, NULL);
}
char* start = buf;
char* end;
/*
* Break comma-separated method signatures and enter them into the hash
* table individually.
*/
do {
int hashValue;
end = strchr(start, ',');
if (end) {
*end = 0;
}
hashValue = dvmComputeUtf8Hash(start);
dvmHashTableLookup(isMethod ? gDvmJit.methodTable : gDvmJit.classTable,
hashValue, strdup(start), (HashCompareFunc) strcmp, true);
if (end) {
start = end + 1;
} else {
break;
}
} while (1);
free(buf);
}
/* The format of jit_config.list:
EXCLUDE or INCLUDE
CLASS
prefix1 ...
METHOD
prefix 1 ...
OFFSET
index ... //each pair is a range, if pcOff falls into a range, JIT
*/
static int processXjitconfig(const char* opt) {
FILE* fp = fopen(opt, "r");
if (fp == NULL) {
return -1;
}
char fLine[500];
bool startClass = false, startMethod = false, startOffset = false;
gDvmJit.num_entries_pcTable = 0;
int idx = 0;
while (fgets(fLine, 500, fp) != NULL) {
char* curLine = strtok(fLine, " \t\r\n");
/* handles keyword CLASS, METHOD, INCLUDE, EXCLUDE */
if (!strncmp(curLine, "CLASS", 5)) {
startClass = true;
startMethod = false;
startOffset = false;
continue;
}
if (!strncmp(curLine, "METHOD", 6)) {
startMethod = true;
startClass = false;
startOffset = false;
continue;
}
if (!strncmp(curLine, "OFFSET", 6)) {
startOffset = true;
startMethod = false;
startClass = false;
continue;
}
if (!strncmp(curLine, "EXCLUDE", 7)) {
gDvmJit.includeSelectedMethod = false;
continue;
}
if (!strncmp(curLine, "INCLUDE", 7)) {
gDvmJit.includeSelectedMethod = true;
continue;
}
if (!startMethod && !startClass && !startOffset) {
continue;
}
int hashValue = dvmComputeUtf8Hash(curLine);
if (startMethod) {
if (gDvmJit.methodTable == NULL) {
gDvmJit.methodTable = dvmHashTableCreate(8, NULL);
}
dvmHashTableLookup(gDvmJit.methodTable, hashValue,
strdup(curLine),
(HashCompareFunc) strcmp, true);
} else if (startClass) {
if (gDvmJit.classTable == NULL) {
gDvmJit.classTable = dvmHashTableCreate(8, NULL);
}
dvmHashTableLookup(gDvmJit.classTable, hashValue,
strdup(curLine),
(HashCompareFunc) strcmp, true);
} else if (startOffset) {
int tmpInt = atoi(curLine);
gDvmJit.pcTable[idx++] = tmpInt;
if (idx >= COMPILER_PC_OFFSET_SIZE) {
printf("processXjitoffset: ignore entries beyond %d\n", COMPILER_PC_OFFSET_SIZE);
break;
}
}
}
gDvmJit.num_entries_pcTable = idx;
fclose(fp);
return 0;
}
#endif
/*
* Process an argument vector full of options. Unlike standard C programs,
* argv[0] does not contain the name of the program.
*
* If "ignoreUnrecognized" is set, we ignore options starting with "-X" or "_"
* that we don't recognize. Otherwise, we return with an error as soon as
* we see anything we can't identify.
*
* Returns 0 on success, -1 on failure, and 1 for the special case of
* "-version" where we want to stop without showing an error message.
*/
static int processOptions(int argc, const char* const argv[],
bool ignoreUnrecognized)
{
int i;
ALOGV("VM options (%d):", argc);
for (i = 0; i < argc; i++)
ALOGV(" %d: '%s'", i, argv[i]);
/*
* Over-allocate AssertionControl array for convenience. If allocated,
* the array must be able to hold at least one entry, so that the
* zygote-time activation can do its business.
*/
assert(gDvm.assertionCtrl == NULL);
if (argc > 0) {
gDvm.assertionCtrl =
(AssertionControl*) malloc(sizeof(AssertionControl) * argc);
if (gDvm.assertionCtrl == NULL)
return -1;
assert(gDvm.assertionCtrlCount == 0);
}
for (i = 0; i < argc; i++) {
if (strcmp(argv[i], "-help") == 0) {
/* show usage and stop */
return -1;
} else if (strcmp(argv[i], "-version") == 0) {
/* show version and stop */
showVersion();
return 1;
} else if (strcmp(argv[i], "-showversion") == 0) {
/* show version and continue */
showVersion();
} else if (strcmp(argv[i], "-classpath") == 0 ||
strcmp(argv[i], "-cp") == 0)
{
/* set classpath */
if (i == argc-1) {
dvmFprintf(stderr, "Missing classpath path list\n");
return -1;
}
free(gDvm.classPathStr); /* in case we have compiled-in default */
gDvm.classPathStr = strdup(argv[++i]);
} else if (strncmp(argv[i], "-Xbootclasspath:",
sizeof("-Xbootclasspath:")-1) == 0)
{
/* set bootclasspath */
const char* path = argv[i] + sizeof("-Xbootclasspath:")-1;
if (*path == '\0') {
dvmFprintf(stderr, "Missing bootclasspath path list\n");
return -1;
}
free(gDvm.bootClassPathStr);
gDvm.bootClassPathStr = strdup(path);
} else if (strncmp(argv[i], "-Xbootclasspath/a:",
sizeof("-Xbootclasspath/a:")-1) == 0) {
const char* appPath = argv[i] + sizeof("-Xbootclasspath/a:")-1;
if (*(appPath) == '\0') {
dvmFprintf(stderr, "Missing appending bootclasspath path list\n");
return -1;
}
char* allPath;
if (asprintf(&allPath, "%s:%s", gDvm.bootClassPathStr, appPath) < 0) {
dvmFprintf(stderr, "Can't append to bootclasspath path list\n");
return -1;
}
free(gDvm.bootClassPathStr);
gDvm.bootClassPathStr = allPath;
} else if (strncmp(argv[i], "-Xbootclasspath/p:",
sizeof("-Xbootclasspath/p:")-1) == 0) {
const char* prePath = argv[i] + sizeof("-Xbootclasspath/p:")-1;
if (*(prePath) == '\0') {
dvmFprintf(stderr, "Missing prepending bootclasspath path list\n");
return -1;
}
char* allPath;
if (asprintf(&allPath, "%s:%s", prePath, gDvm.bootClassPathStr) < 0) {
dvmFprintf(stderr, "Can't prepend to bootclasspath path list\n");
return -1;
}
free(gDvm.bootClassPathStr);
gDvm.bootClassPathStr = allPath;
} else if (strncmp(argv[i], "-D", 2) == 0) {
/* Properties are handled in managed code. We just check syntax. */
if (strchr(argv[i], '=') == NULL) {
dvmFprintf(stderr, "Bad system property setting: \"%s\"\n",
argv[i]);
return -1;
}
gDvm.properties->push_back(argv[i] + 2);
} else if (strcmp(argv[i], "-jar") == 0) {
// TODO: handle this; name of jar should be in argv[i+1]
dvmFprintf(stderr, "-jar not yet handled\n");
assert(false);
} else if (strncmp(argv[i], "-Xms", 4) == 0) {
size_t val = parseMemOption(argv[i]+4, 1024);
if (val != 0) {
if (val >= kMinHeapStartSize && val <= kMaxHeapSize) {
gDvm.heapStartingSize = val;
} else {
dvmFprintf(stderr,
"Invalid -Xms '%s', range is %dKB to %dKB\n",
argv[i], kMinHeapStartSize/1024, kMaxHeapSize/1024);
return -1;
}
} else {
dvmFprintf(stderr, "Invalid -Xms option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-Xmx", 4) == 0) {
size_t val = parseMemOption(argv[i]+4, 1024);
if (val != 0) {
if (val >= kMinHeapSize && val <= kMaxHeapSize) {
gDvm.heapMaximumSize = val;
} else {
dvmFprintf(stderr,
"Invalid -Xmx '%s', range is %dKB to %dKB\n",
argv[i], kMinHeapSize/1024, kMaxHeapSize/1024);
return -1;
}
} else {
dvmFprintf(stderr, "Invalid -Xmx option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-XX:HeapGrowthLimit=", 20) == 0) {
size_t val = parseMemOption(argv[i] + 20, 1024);
if (val != 0) {
gDvm.heapGrowthLimit = val;
} else {
dvmFprintf(stderr, "Invalid -XX:HeapGrowthLimit option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-XX:HeapMinFree=", 16) == 0) {
size_t val = parseMemOption(argv[i] + 16, 1024);
if (val != 0) {
gDvm.heapMinFree = val;
} else {
dvmFprintf(stderr, "Invalid -XX:HeapMinFree option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-XX:HeapMaxFree=", 16) == 0) {
size_t val = parseMemOption(argv[i] + 16, 1024);
if (val != 0) {
gDvm.heapMaxFree = val;
} else {
dvmFprintf(stderr, "Invalid -XX:HeapMaxFree option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-XX:HeapTargetUtilization=", 26) == 0) {
const char* start = argv[i] + 26;
const char* end = start;
double val = strtod(start, const_cast<char**>(&end));
// Ensure that we have a value, there was no cruft after it and it
// satisfies a sensible range.
bool sane_val = (start != end) && (end[0] == '\0') &&
(val >= 0.1) && (val <= 0.9);
if (sane_val) {
gDvm.heapTargetUtilization = val;
} else {
dvmFprintf(stderr, "Invalid -XX:HeapTargetUtilization option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-Xss", 4) == 0) {
size_t val = parseMemOption(argv[i]+4, 1);
if (val != 0) {
if (val >= kMinStackSize && val <= kMaxStackSize) {
gDvm.stackSize = val;
if (val > gDvm.mainThreadStackSize) {
gDvm.mainThreadStackSize = val;
}
} else {
dvmFprintf(stderr, "Invalid -Xss '%s', range is %d to %d\n",
argv[i], kMinStackSize, kMaxStackSize);
return -1;
}
} else {
dvmFprintf(stderr, "Invalid -Xss option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-XX:mainThreadStackSize=", strlen("-XX:mainThreadStackSize=")) == 0) {
size_t val = parseMemOption(argv[i] + strlen("-XX:mainThreadStackSize="), 1);
if (val != 0) {
if (val >= kMinStackSize && val <= kMaxStackSize) {
gDvm.mainThreadStackSize = val;
} else {
dvmFprintf(stderr, "Invalid -XX:mainThreadStackSize '%s', range is %d to %d\n",
argv[i], kMinStackSize, kMaxStackSize);
return -1;
}
} else {
dvmFprintf(stderr, "Invalid -XX:mainThreadStackSize option '%s'\n", argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-XX:+DisableExplicitGC", 22) == 0) {
gDvm.disableExplicitGc = true;
} else if (strcmp(argv[i], "-verbose") == 0 ||
strcmp(argv[i], "-verbose:class") == 0)
{
// JNI spec says "-verbose:gc,class" is valid, but cmd line
// doesn't work that way; may want to support.
gDvm.verboseClass = true;
} else if (strcmp(argv[i], "-verbose:jni") == 0) {
gDvm.verboseJni = true;
} else if (strcmp(argv[i], "-verbose:gc") == 0) {
gDvm.verboseGc = true;
} else if (strcmp(argv[i], "-verbose:shutdown") == 0) {
gDvm.verboseShutdown = true;
} else if (strncmp(argv[i], "-enableassertions", 17) == 0) {
enableAssertions(argv[i] + 17, true);
} else if (strncmp(argv[i], "-ea", 3) == 0) {
enableAssertions(argv[i] + 3, true);
} else if (strncmp(argv[i], "-disableassertions", 18) == 0) {
enableAssertions(argv[i] + 18, false);
} else if (strncmp(argv[i], "-da", 3) == 0) {
enableAssertions(argv[i] + 3, false);
} else if (strcmp(argv[i], "-enablesystemassertions") == 0 ||
strcmp(argv[i], "-esa") == 0)
{
enableAssertions(NULL, true);
} else if (strcmp(argv[i], "-disablesystemassertions") == 0 ||
strcmp(argv[i], "-dsa") == 0)
{
enableAssertions(NULL, false);
} else if (strncmp(argv[i], "-Xcheck:jni", 11) == 0) {
/* nothing to do now -- was handled during JNI init */
} else if (strcmp(argv[i], "-Xdebug") == 0) {
/* accept but ignore */
} else if (strncmp(argv[i], "-Xrunjdwp:", 10) == 0 ||
strncmp(argv[i], "-agentlib:jdwp=", 15) == 0)
{
const char* tail;
if (argv[i][1] == 'X')
tail = argv[i] + 10;
else
tail = argv[i] + 15;
if (strncmp(tail, "help", 4) == 0 || !parseJdwpOptions(tail)) {
showJdwpHelp();
return 1;
}
} else if (strcmp(argv[i], "-Xrs") == 0) {
gDvm.reduceSignals = true;
} else if (strcmp(argv[i], "-Xnoquithandler") == 0) {
/* disables SIGQUIT handler thread while still blocking SIGQUIT */
/* (useful if we don't want thread but system still signals us) */
gDvm.noQuitHandler = true;
} else if (strcmp(argv[i], "-Xzygote") == 0) {
gDvm.zygote = true;
#if defined(WITH_JIT)
gDvmJit.runningInAndroidFramework = true;
#endif
} else if (strncmp(argv[i], "-Xdexopt:", 9) == 0) {
if (strcmp(argv[i] + 9, "none") == 0)
gDvm.dexOptMode = OPTIMIZE_MODE_NONE;
else if (strcmp(argv[i] + 9, "verified") == 0)
gDvm.dexOptMode = OPTIMIZE_MODE_VERIFIED;
else if (strcmp(argv[i] + 9, "all") == 0)
gDvm.dexOptMode = OPTIMIZE_MODE_ALL;
else if (strcmp(argv[i] + 9, "full") == 0)
gDvm.dexOptMode = OPTIMIZE_MODE_FULL;
else {
dvmFprintf(stderr, "Unrecognized dexopt option '%s'\n",argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-Xverify:", 9) == 0) {
if (strcmp(argv[i] + 9, "none") == 0)
gDvm.classVerifyMode = VERIFY_MODE_NONE;
else if (strcmp(argv[i] + 9, "remote") == 0)
gDvm.classVerifyMode = VERIFY_MODE_REMOTE;
else if (strcmp(argv[i] + 9, "all") == 0)
gDvm.classVerifyMode = VERIFY_MODE_ALL;
else {
dvmFprintf(stderr, "Unrecognized verify option '%s'\n",argv[i]);
return -1;
}
} else if (strncmp(argv[i], "-Xjnigreflimit:", 15) == 0) {
int lim = atoi(argv[i] + 15);
if (lim < 200 || (lim % 100) != 0) {
dvmFprintf(stderr, "Bad value for -Xjnigreflimit: '%s'\n",
argv[i]+15);
return -1;
}
gDvm.jniGrefLimit = lim;
} else if (strncmp(argv[i], "-Xjnitrace:", 11) == 0) {
gDvm.jniTrace = strdup(argv[i] + 11);
} else if (strcmp(argv[i], "-Xlog-stdio") == 0) {
gDvm.logStdio = true;
} else if (strncmp(argv[i], "-Xint", 5) == 0) {
if (argv[i][5] == ':') {
if (strcmp(argv[i] + 6, "portable") == 0)
gDvm.executionMode = kExecutionModeInterpPortable;
else if (strcmp(argv[i] + 6, "fast") == 0)
gDvm.executionMode = kExecutionModeInterpFast;
#ifdef WITH_JIT
else if (strcmp(argv[i] + 6, "jit") == 0)
gDvm.executionMode = kExecutionModeJit;
#endif
else {
dvmFprintf(stderr,
"Warning: Unrecognized interpreter mode %s\n",argv[i]);
/* keep going */
}
} else {
/* disable JIT if it was enabled by default */
gDvm.executionMode = kExecutionModeInterpFast;
}
} else if (strncmp(argv[i], "-Xlockprofthreshold:", 20) == 0) {
gDvm.lockProfThreshold = atoi(argv[i] + 20);
#ifdef WITH_JIT
} else if (strncmp(argv[i], "-Xjitop", 7) == 0) {
processXjitop(argv[i]);
} else if (strncmp(argv[i], "-Xjitmethod:", 12) == 0) {
processXjitmethod(argv[i] + strlen("-Xjitmethod:"), true);
} else if (strncmp(argv[i], "-Xjitclass:", 11) == 0) {
processXjitmethod(argv[i] + strlen("-Xjitclass:"), false);
} else if (strncmp(argv[i], "-Xjitoffset:", 12) == 0) {
processXjitoffset(argv[i] + strlen("-Xjitoffset:"));
} else if (strncmp(argv[i], "-Xjitconfig:", 12) == 0) {
processXjitconfig(argv[i] + strlen("-Xjitconfig:"));
} else if (strncmp(argv[i], "-Xjitblocking", 13) == 0) {
gDvmJit.blockingMode = true;
} else if (strncmp(argv[i], "-Xjitthreshold:", 15) == 0) {
gDvmJit.threshold = atoi(argv[i] + 15);
} else if (strncmp(argv[i], "-Xincludeselectedop", 19) == 0) {
gDvmJit.includeSelectedOp = true;
} else if (strncmp(argv[i], "-Xincludeselectedmethod", 23) == 0) {
gDvmJit.includeSelectedMethod = true;
} else if (strncmp(argv[i], "-Xjitcheckcg", 12) == 0) {
gDvmJit.checkCallGraph = true;
/* Need to enable blocking mode due to stack crawling */
gDvmJit.blockingMode = true;
} else if (strncmp(argv[i], "-Xjitdumpbin", 12) == 0) {
gDvmJit.printBinary = true;
} else if (strncmp(argv[i], "-Xjitverbose", 12) == 0) {
gDvmJit.printMe = true;
} else if (strncmp(argv[i], "-Xjitprofile", 12) == 0) {
gDvmJit.profileMode = kTraceProfilingContinuous;
} else if (strncmp(argv[i], "-Xjitdisableopt", 15) == 0) {
/* Disable selected optimizations */
if (argv[i][15] == ':') {
sscanf(argv[i] + 16, "%x", &gDvmJit.disableOpt);
/* Disable all optimizations */
} else {
gDvmJit.disableOpt = -1;
}
} else if (strncmp(argv[i], "-Xjitsuspendpoll", 16) == 0) {
gDvmJit.genSuspendPoll = true;
#endif
} else if (strncmp(argv[i], "-Xstacktracefile:", 17) == 0) {
gDvm.stackTraceFile = strdup(argv[i]+17);
} else if (strcmp(argv[i], "-Xgenregmap") == 0) {
gDvm.generateRegisterMaps = true;
} else if (strcmp(argv[i], "-Xnogenregmap") == 0) {
gDvm.generateRegisterMaps = false;
} else if (strcmp(argv[i], "Xverifyopt:checkmon") == 0) {
gDvm.monitorVerification = true;
} else if (strcmp(argv[i], "Xverifyopt:nocheckmon") == 0) {
gDvm.monitorVerification = false;
} else if (strncmp(argv[i], "-Xgc:", 5) == 0) {
if (strcmp(argv[i] + 5, "precise") == 0)
gDvm.preciseGc = true;
else if (strcmp(argv[i] + 5, "noprecise") == 0)
gDvm.preciseGc = false;
else if (strcmp(argv[i] + 5, "preverify") == 0)
gDvm.preVerify = true;
else if (strcmp(argv[i] + 5, "nopreverify") == 0)
gDvm.preVerify = false;
else if (strcmp(argv[i] + 5, "postverify") == 0)
gDvm.postVerify = true;
else if (strcmp(argv[i] + 5, "nopostverify") == 0)
gDvm.postVerify = false;
else if (strcmp(argv[i] + 5, "concurrent") == 0)
gDvm.concurrentMarkSweep = true;
else if (strcmp(argv[i] + 5, "noconcurrent") == 0)
gDvm.concurrentMarkSweep = false;
else if (strcmp(argv[i] + 5, "verifycardtable") == 0)
gDvm.verifyCardTable = true;
else if (strcmp(argv[i] + 5, "noverifycardtable") == 0)
gDvm.verifyCardTable = false;
else {
dvmFprintf(stderr, "Bad value for -Xgc");
return -1;
}
ALOGV("Precise GC configured %s", gDvm.preciseGc ? "ON" : "OFF");
} else if (strcmp(argv[i], "-Xcheckdexsum") == 0) {
gDvm.verifyDexChecksum = true;
} else if (strcmp(argv[i], "-Xprofile:threadcpuclock") == 0) {
gDvm.profilerClockSource = kProfilerClockSourceThreadCpu;
} else if (strcmp(argv[i], "-Xprofile:wallclock") == 0) {
gDvm.profilerClockSource = kProfilerClockSourceWall;
} else if (strcmp(argv[i], "-Xprofile:dualclock") == 0) {
gDvm.profilerClockSource = kProfilerClockSourceDual;
} else {
if (!ignoreUnrecognized) {
dvmFprintf(stderr, "Unrecognized option '%s'\n", argv[i]);
return -1;
}
}
}
return 0;
}
/*
* Set defaults for fields altered or modified by arguments.
*
* Globals are initialized to 0 (a/k/a NULL or false).
*/
static void setCommandLineDefaults()
{
const char* envStr = getenv("CLASSPATH");
if (envStr != NULL) {
gDvm.classPathStr = strdup(envStr);
} else {
gDvm.classPathStr = strdup(".");
}
envStr = getenv("BOOTCLASSPATH");
if (envStr != NULL) {
gDvm.bootClassPathStr = strdup(envStr);
} else {
gDvm.bootClassPathStr = strdup(".");
}
gDvm.properties = new std::vector<std::string>();
/* Defaults overridden by -Xms and -Xmx.
* TODO: base these on a system or application-specific default
*/
gDvm.heapStartingSize = 2 * 1024 * 1024; // Spec says 16MB; too big for us.
gDvm.heapMaximumSize = 16 * 1024 * 1024; // Spec says 75% physical mem
gDvm.heapGrowthLimit = 0; // 0 means no growth limit
gDvm.stackSize = kDefaultStackSize;
gDvm.mainThreadStackSize = kDefaultStackSize;
// When the heap is less than the maximum or growth limited size,
// fix the free portion of the heap. The utilization is the ratio
// of live to free memory, 0.5 implies half the heap is available
// to allocate into before a GC occurs. Min free and max free
// force the free memory to never be smaller than min free or
// larger than max free.
gDvm.heapTargetUtilization = 0.5;
gDvm.heapMaxFree = 2 * 1024 * 1024;
gDvm.heapMinFree = gDvm.heapMaxFree / 4;
gDvm.concurrentMarkSweep = true;
/* gDvm.jdwpSuspend = true; */
/* allowed unless zygote config doesn't allow it */
gDvm.jdwpAllowed = true;
/* default verification and optimization modes */
gDvm.classVerifyMode = VERIFY_MODE_ALL;
gDvm.dexOptMode = OPTIMIZE_MODE_VERIFIED;
gDvm.monitorVerification = false;
gDvm.generateRegisterMaps = true;
gDvm.registerMapMode = kRegisterMapModeTypePrecise;
/*
* Default execution mode.
*
* This should probably interact with the mterp code somehow, e.g. if
* we know we're using the "desktop" build we should probably be
* using "portable" rather than "fast".
*/
#if defined(WITH_JIT)
gDvm.executionMode = kExecutionModeJit;
gDvmJit.num_entries_pcTable = 0;
gDvmJit.includeSelectedMethod = false;
gDvmJit.includeSelectedOffset = false;
gDvmJit.methodTable = NULL;
gDvmJit.classTable = NULL;
gDvm.constInit = false;
gDvm.commonInit = false;
#else
gDvm.executionMode = kExecutionModeInterpFast;
#endif
/*
* SMP support is a compile-time define, but we may want to have
* dexopt target a differently-configured device.
*/
gDvm.dexOptForSmp = (ANDROID_SMP != 0);
/*
* Default profiler configuration.
*/
gDvm.profilerClockSource = kProfilerClockSourceDual;
}
/*
* Handle a SIGBUS, which frequently occurs because somebody replaced an
* optimized DEX file out from under us.
*/
static void busCatcher(int signum, siginfo_t* info, void* context)
{
void* addr = info->si_addr;
ALOGE("Caught a SIGBUS (%d), addr=%p", signum, addr);
/*
* If we return at this point the SIGBUS just keeps happening, so we
* remove the signal handler and allow it to kill us. TODO: restore
* the original, which points to a debuggerd stub; if we don't then
* debuggerd won't be notified.
*/
signal(SIGBUS, SIG_DFL);
}
/*
* Configure signals. We need to block SIGQUIT so that the signal only
* reaches the dump-stack-trace thread.
*
* This can be disabled with the "-Xrs" flag.
*/
static void blockSignals()
{
sigset_t mask;
int cc;
sigemptyset(&mask);
sigaddset(&mask, SIGQUIT);
sigaddset(&mask, SIGUSR1); // used to initiate heap dump
#if defined(WITH_JIT) && defined(WITH_JIT_TUNING)
sigaddset(&mask, SIGUSR2); // used to investigate JIT internals
#endif
//sigaddset(&mask, SIGPIPE);
cc = sigprocmask(SIG_BLOCK, &mask, NULL);
assert(cc == 0);
if (false) {
/* TODO: save the old sigaction in a global */
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = busCatcher;
sa.sa_flags = SA_SIGINFO;
cc = sigaction(SIGBUS, &sa, NULL);
assert(cc == 0);
}
}
class ScopedShutdown {
public:
ScopedShutdown() : armed_(true) {
}
~ScopedShutdown() {
if (armed_) {
dvmShutdown();
}
}
void disarm() {
armed_ = false;
}
private:
bool armed_;
};
/*
* VM initialization. Pass in any options provided on the command line.
* Do not pass in the class name or the options for the class.
*
* Returns 0 on success.
*/
std::string dvmStartup(int argc, const char* const argv[],
bool ignoreUnrecognized, JNIEnv* pEnv)
{
ScopedShutdown scopedShutdown;
assert(gDvm.initializing);
ALOGV("VM init args (%d):", argc);
for (int i = 0; i < argc; i++) {
ALOGV(" %d: '%s'", i, argv[i]);
}
setCommandLineDefaults();
/*
* Process the option flags (if any).
*/
int cc = processOptions(argc, argv, ignoreUnrecognized);
if (cc != 0) {
if (cc < 0) {
dvmFprintf(stderr, "\n");
usage("dalvikvm");
}
return "syntax error";
}
#if WITH_EXTRA_GC_CHECKS > 1
/* only "portable" interp has the extra goodies */
if (gDvm.executionMode != kExecutionModeInterpPortable) {
ALOGI("Switching to 'portable' interpreter for GC checks");
gDvm.executionMode = kExecutionModeInterpPortable;
}
#endif
/* Configure group scheduling capabilities */
if (!access("/dev/cpuctl/tasks", F_OK)) {
ALOGV("Using kernel group scheduling");
gDvm.kernelGroupScheduling = 1;
} else {
ALOGV("Using kernel scheduler policies");
}
/* configure signal handling */
if (!gDvm.reduceSignals)
blockSignals();
/* verify system page size */
if (sysconf(_SC_PAGESIZE) != SYSTEM_PAGE_SIZE) {
return StringPrintf("expected page size %d, got %d",
SYSTEM_PAGE_SIZE, (int) sysconf(_SC_PAGESIZE));
}
/* mterp setup */
ALOGV("Using executionMode %d", gDvm.executionMode);
dvmCheckAsmConstants();
/*
* Initialize components.
*/
dvmQuasiAtomicsStartup();
if (!dvmAllocTrackerStartup()) {
return "dvmAllocTrackerStartup failed";
}
if (!dvmGcStartup()) {
return "dvmGcStartup failed";
}
if (!dvmThreadStartup()) {
return "dvmThreadStartup failed";
}
if (!dvmInlineNativeStartup()) {
return "dvmInlineNativeStartup";
}
if (!dvmRegisterMapStartup()) {
return "dvmRegisterMapStartup failed";
}
if (!dvmInstanceofStartup()) {
return "dvmInstanceofStartup failed";
}
if (!dvmClassStartup()) {
return "dvmClassStartup failed";
}
/*
* At this point, the system is guaranteed to be sufficiently
* initialized that we can look up classes and class members. This
* call populates the gDvm instance with all the class and member
* references that the VM wants to use directly.
*/
if (!dvmFindRequiredClassesAndMembers()) {
return "dvmFindRequiredClassesAndMembers failed";
}
if (!dvmStringInternStartup()) {
return "dvmStringInternStartup failed";
}
if (!dvmNativeStartup()) {
return "dvmNativeStartup failed";
}
if (!dvmInternalNativeStartup()) {
return "dvmInternalNativeStartup failed";
}
if (!dvmJniStartup()) {
return "dvmJniStartup failed";
}
if (!dvmProfilingStartup()) {
return "dvmProfilingStartup failed";
}
/*
* Create a table of methods for which we will substitute an "inline"
* version for performance.
*/
if (!dvmCreateInlineSubsTable()) {
return "dvmCreateInlineSubsTable failed";
}
/*
* Miscellaneous class library validation.
*/
if (!dvmValidateBoxClasses()) {
return "dvmValidateBoxClasses failed";
}
/*
* Do the last bits of Thread struct initialization we need to allow
* JNI calls to work.
*/
if (!dvmPrepMainForJni(pEnv)) {
return "dvmPrepMainForJni failed";
}
/*
* Explicitly initialize java.lang.Class. This doesn't happen
* automatically because it's allocated specially (it's an instance
* of itself). Must happen before registration of system natives,
* which make some calls that throw assertions if the classes they
* operate on aren't initialized.
*/
if (!dvmInitClass(gDvm.classJavaLangClass)) {
return "couldn't initialized java.lang.Class";
}
/*
* Register the system native methods, which are registered through JNI.
*/
if (!registerSystemNatives(pEnv)) {
return "couldn't register system natives";
}
/*
* Do some "late" initialization for the memory allocator. This may
* allocate storage and initialize classes.
*/
if (!dvmCreateStockExceptions()) {
return "dvmCreateStockExceptions failed";
}
/*
* At this point, the VM is in a pretty good state. Finish prep on
* the main thread (specifically, create a java.lang.Thread object to go
* along with our Thread struct). Note we will probably be executing
* some interpreted class initializer code in here.
*/
if (!dvmPrepMainThread()) {
return "dvmPrepMainThread failed";
}
/*
* Make sure we haven't accumulated any tracked references. The main
* thread should be starting with a clean slate.
*/
if (dvmReferenceTableEntries(&dvmThreadSelf()->internalLocalRefTable) != 0)
{
ALOGW("Warning: tracked references remain post-initialization");
dvmDumpReferenceTable(&dvmThreadSelf()->internalLocalRefTable, "MAIN");
}
/* general debugging setup */
if (!dvmDebuggerStartup()) {
return "dvmDebuggerStartup failed";
}
if (!dvmGcStartupClasses()) {
return "dvmGcStartupClasses failed";
}
/*
* Init for either zygote mode or non-zygote mode. The key difference
* is that we don't start any additional threads in Zygote mode.
*/
if (gDvm.zygote) {
if (!initZygote()) {
return "initZygote failed";
}
} else {
if (!dvmInitAfterZygote()) {
return "dvmInitAfterZygote failed";
}
}
#ifndef NDEBUG
if (!dvmTestHash())
ALOGE("dvmTestHash FAILED");
if (false /*noisy!*/ && !dvmTestIndirectRefTable())
ALOGE("dvmTestIndirectRefTable FAILED");
#endif
if (dvmCheckException(dvmThreadSelf())) {
dvmLogExceptionStackTrace();
return "Exception pending at end of VM initialization";
}
scopedShutdown.disarm();
return "";
}
static void loadJniLibrary(const char* name) {
std::string mappedName(StringPrintf(OS_SHARED_LIB_FORMAT_STR, name));
char* reason = NULL;
if (!dvmLoadNativeCode(mappedName.c_str(), NULL, &reason)) {
ALOGE("dvmLoadNativeCode failed for \"%s\": %s", name, reason);
dvmAbort();
}
}
/*
* Register java.* natives from our class libraries. We need to do
* this after we're ready for JNI registration calls, but before we
* do any class initialization.
*
* If we get this wrong, we will blow up in the ThreadGroup class init if
* interpreted code makes any reference to System. It will likely do this
* since it wants to do some java.io.File setup (e.g. for static in/out/err).
*
* We need to have gDvm.initializing raised here so that JNI FindClass
* won't try to use the system/application class loader.
*/
static bool registerSystemNatives(JNIEnv* pEnv)
{
// Main thread is always first in list.
Thread* self = gDvm.threadList;
// Must set this before allowing JNI-based method registration.
self->status = THREAD_NATIVE;
// Most JNI libraries can just use System.loadLibrary, but you can't
// if you're the library that implements System.loadLibrary!
loadJniLibrary("javacore");
loadJniLibrary("nativehelper");
// Back to run mode.
self->status = THREAD_RUNNING;
return true;
}
/*
* Copied and modified slightly from system/core/toolbox/mount.c
*/
static std::string getMountsDevDir(const char *arg)
{
char mount_dev[256];
char mount_dir[256];
int match;
FILE *fp = fopen("/proc/self/mounts", "r");
if (fp == NULL) {
ALOGE("Could not open /proc/self/mounts: %s", strerror(errno));
return "";
}
while ((match = fscanf(fp, "%255s %255s %*s %*s %*d %*d\n", mount_dev, mount_dir)) != EOF) {
mount_dev[255] = 0;
mount_dir[255] = 0;
if (match == 2 && (strcmp(arg, mount_dir) == 0)) {
fclose(fp);
return mount_dev;
}
}
fclose(fp);
return "";
}
/*
* Do zygote-mode-only initialization.
*/
static bool initZygote()
{
/* zygote goes into its own process group */
setpgid(0,0);
// See storage config details at http://source.android.com/tech/storage/
// Create private mount namespace shared by all children
if (unshare(CLONE_NEWNS) == -1) {
SLOGE("Failed to unshare(): %s", strerror(errno));
return -1;
}
// Mark rootfs as being a slave so that changes from default
// namespace only flow into our children.
if (mount("rootfs", "/", NULL, (MS_SLAVE | MS_REC), NULL) == -1) {
SLOGE("Failed to mount() rootfs as MS_SLAVE: %s", strerror(errno));
return -1;
}
// Create a staging tmpfs that is shared by our children; they will
// bind mount storage into their respective private namespaces, which
// are isolated from each other.
const char* target_base = getenv("EMULATED_STORAGE_TARGET");
if (target_base != NULL) {
if (mount("tmpfs", target_base, "tmpfs", MS_NOSUID | MS_NODEV,
"uid=0,gid=1028,mode=0050") == -1) {
SLOGE("Failed to mount tmpfs to %s: %s", target_base, strerror(errno));
return -1;
}
}
// Mark /system as NOSUID | NODEV
const char* android_root = getenv("ANDROID_ROOT");
if (android_root == NULL) {
SLOGE("environment variable ANDROID_ROOT does not exist?!?!");
return -1;
}
std::string mountDev(getMountsDevDir(android_root));
if (mountDev.empty()) {
SLOGE("Unable to find mount point for %s", android_root);
return -1;
}
if (mount(mountDev.c_str(), android_root, "none",
MS_REMOUNT | MS_NOSUID | MS_NODEV | MS_RDONLY | MS_BIND, NULL) == -1) {
SLOGE("Remount of %s failed: %s", android_root, strerror(errno));
return -1;
}
return true;
}
/*
* Do non-zygote-mode initialization. This is done during VM init for
* standard startup, or after a "zygote fork" when creating a new process.
*/
bool dvmInitAfterZygote()
{
u8 startHeap, startQuit, startJdwp;
u8 endHeap, endQuit, endJdwp;
startHeap = dvmGetRelativeTimeUsec();
/*
* Post-zygote heap initialization, including starting
* the HeapWorker thread.
*/
if (!dvmGcStartupAfterZygote())
return false;
endHeap = dvmGetRelativeTimeUsec();
startQuit = dvmGetRelativeTimeUsec();
/* start signal catcher thread that dumps stacks on SIGQUIT */
if (!gDvm.reduceSignals && !gDvm.noQuitHandler) {
if (!dvmSignalCatcherStartup())
return false;
}
/* start stdout/stderr copier, if requested */
if (gDvm.logStdio) {
if (!dvmStdioConverterStartup())
return false;
}
endQuit = dvmGetRelativeTimeUsec();
startJdwp = dvmGetRelativeTimeUsec();
/*
* Start JDWP thread. If the command-line debugger flags specified
* "suspend=y", this will pause the VM. We probably want this to
* come last.
*/
if (!initJdwp()) {
ALOGD("JDWP init failed; continuing anyway");
}
endJdwp = dvmGetRelativeTimeUsec();
ALOGV("thread-start heap=%d quit=%d jdwp=%d total=%d usec",
(int)(endHeap-startHeap), (int)(endQuit-startQuit),
(int)(endJdwp-startJdwp), (int)(endJdwp-startHeap));
#ifdef WITH_JIT
if (gDvm.executionMode == kExecutionModeJit) {
if (!dvmCompilerStartup())
return false;
}
#endif
return true;
}
/*
* Prepare for a connection to a JDWP-compliant debugger.
*
* Note this needs to happen fairly late in the startup process, because
* we need to have all of the java.* native methods registered (which in
* turn requires JNI to be fully prepped).
*
* There are several ways to initialize:
* server=n
* We immediately try to connect to host:port. Bail on failure. On
* success, send VM_START (suspending the VM if "suspend=y").
* server=y suspend=n
* Passively listen for a debugger to connect. Return immediately.
* server=y suspend=y
* Wait until debugger connects. Send VM_START ASAP, suspending the
* VM after the message is sent.
*
* This gets more complicated with a nonzero value for "timeout".
*/
static bool initJdwp()
{
assert(!gDvm.zygote);
/*
* Init JDWP if the debugger is enabled. This may connect out to a
* debugger, passively listen for a debugger, or block waiting for a
* debugger.
*/
if (gDvm.jdwpAllowed && gDvm.jdwpConfigured) {
JdwpStartupParams params;
if (gDvm.jdwpHost != NULL) {
if (strlen(gDvm.jdwpHost) >= sizeof(params.host)-1) {
ALOGE("ERROR: hostname too long: '%s'", gDvm.jdwpHost);
return false;
}
strcpy(params.host, gDvm.jdwpHost);
} else {
params.host[0] = '\0';
}
params.transport = gDvm.jdwpTransport;
params.server = gDvm.jdwpServer;
params.suspend = gDvm.jdwpSuspend;
params.port = gDvm.jdwpPort;
gDvm.jdwpState = dvmJdwpStartup(&params);
if (gDvm.jdwpState == NULL) {
ALOGW("WARNING: debugger thread failed to initialize");
/* TODO: ignore? fail? need to mimic "expected" behavior */
}
}
/*
* If a debugger has already attached, send the "welcome" message. This
* may cause us to suspend all threads.
*/
if (dvmJdwpIsActive(gDvm.jdwpState)) {
//dvmChangeStatus(NULL, THREAD_RUNNING);
if (!dvmJdwpPostVMStart(gDvm.jdwpState, gDvm.jdwpSuspend)) {
ALOGW("WARNING: failed to post 'start' message to debugger");
/* keep going */
}
//dvmChangeStatus(NULL, THREAD_NATIVE);
}
return true;
}
/*
* An alternative to JNI_CreateJavaVM/dvmStartup that does the first bit
* of initialization and then returns with "initializing" still set. (Used
* by DexOpt command-line utility.)
*
* Attempting to use JNI or internal natives will fail. It's best
* if no bytecode gets executed, which means no <clinit>, which means
* no exception-throwing. (In practice we need to initialize Class and
* Object, and probably some exception classes.)
*
* Returns 0 on success.
*/
int dvmPrepForDexOpt(const char* bootClassPath, DexOptimizerMode dexOptMode,
DexClassVerifyMode verifyMode, int dexoptFlags)
{
gDvm.initializing = true;
gDvm.optimizing = true;
/* configure signal handling */
blockSignals();
/* set some defaults */
setCommandLineDefaults();
free(gDvm.bootClassPathStr);
gDvm.bootClassPathStr = strdup(bootClassPath);
/* set opt/verify modes */
gDvm.dexOptMode = dexOptMode;
gDvm.classVerifyMode = verifyMode;
gDvm.generateRegisterMaps = (dexoptFlags & DEXOPT_GEN_REGISTER_MAPS) != 0;
if (dexoptFlags & DEXOPT_SMP) {
assert((dexoptFlags & DEXOPT_UNIPROCESSOR) == 0);
gDvm.dexOptForSmp = true;
} else if (dexoptFlags & DEXOPT_UNIPROCESSOR) {
gDvm.dexOptForSmp = false;
} else {
gDvm.dexOptForSmp = (ANDROID_SMP != 0);
}
/*
* Initialize the heap, some basic thread control mutexes, and
* get the bootclasspath prepped.
*
* We can't load any classes yet because we may not yet have a source
* for things like java.lang.Object and java.lang.Class.
*/
if (!dvmGcStartup())
goto fail;
if (!dvmThreadStartup())
goto fail;
if (!dvmInlineNativeStartup())
goto fail;
if (!dvmRegisterMapStartup())
goto fail;
if (!dvmInstanceofStartup())
goto fail;
if (!dvmClassStartup())
goto fail;
/*
* We leave gDvm.initializing set to "true" so that, if we're not
* able to process the "core" classes, we don't go into a death-spin
* trying to throw a "class not found" exception.
*/
return 0;
fail:
dvmShutdown();
return 1;
}
/*
* All threads have stopped. Finish the shutdown procedure.
*
* We can also be called if startup fails partway through, so be prepared
* to deal with partially initialized data.
*
* Free any storage allocated in gGlobals.
*
* We can't dlclose() shared libs we've loaded, because it's possible a
* thread not associated with the VM is running code in one.
*
* This is called from the JNI DestroyJavaVM function, which can be
* called from any thread. (In practice, this will usually run in the
* same thread that started the VM, a/k/a the main thread, but we don't
* want to assume that.)
*/
void dvmShutdown()
{
ALOGV("VM shutting down");
if (CALC_CACHE_STATS)
dvmDumpAtomicCacheStats(gDvm.instanceofCache);
/*
* Stop our internal threads.
*/
dvmGcThreadShutdown();
if (gDvm.jdwpState != NULL)
dvmJdwpShutdown(gDvm.jdwpState);
free(gDvm.jdwpHost);
gDvm.jdwpHost = NULL;
free(gDvm.jniTrace);
gDvm.jniTrace = NULL;
free(gDvm.stackTraceFile);
gDvm.stackTraceFile = NULL;
/* tell signal catcher to shut down if it was started */
dvmSignalCatcherShutdown();
/* shut down stdout/stderr conversion */
dvmStdioConverterShutdown();
#ifdef WITH_JIT
if (gDvm.executionMode == kExecutionModeJit) {
/* shut down the compiler thread */
dvmCompilerShutdown();
}
#endif
/*
* Kill any daemon threads that still exist. Actively-running threads
* are likely to crash the process if they continue to execute while
* the VM shuts down.
*/
dvmSlayDaemons();
if (gDvm.verboseShutdown)
ALOGD("VM cleaning up");
dvmDebuggerShutdown();
dvmProfilingShutdown();
dvmJniShutdown();
dvmStringInternShutdown();
dvmThreadShutdown();
dvmClassShutdown();
dvmRegisterMapShutdown();
dvmInstanceofShutdown();
dvmInlineNativeShutdown();
dvmGcShutdown();
dvmAllocTrackerShutdown();
/* these must happen AFTER dvmClassShutdown has walked through class data */
dvmNativeShutdown();
dvmInternalNativeShutdown();
dvmFreeInlineSubsTable();
free(gDvm.bootClassPathStr);
free(gDvm.classPathStr);
delete gDvm.properties;
freeAssertionCtrl();
dvmQuasiAtomicsShutdown();
/*
* We want valgrind to report anything we forget to free as "definitely
* lost". If there's a pointer in the global chunk, it would be reported
* as "still reachable". Erasing the memory fixes this.
*
* This must be erased to zero if we want to restart the VM within this
* process.
*/
memset(&gDvm, 0xcd, sizeof(gDvm));
}
/*
* fprintf() wrapper that calls through the JNI-specified vfprintf hook if
* one was specified.
*/
int dvmFprintf(FILE* fp, const char* format, ...)
{
va_list args;
int result;
va_start(args, format);
if (gDvm.vfprintfHook != NULL)
result = (*gDvm.vfprintfHook)(fp, format, args);
else
result = vfprintf(fp, format, args);
va_end(args);
return result;
}
#ifdef __GLIBC__
#include <execinfo.h>
/*
* glibc-only stack dump function. Requires link with "--export-dynamic".
*
* TODO: move this into libs/cutils and make it work for all platforms.
*/
void dvmPrintNativeBackTrace()
{
size_t MAX_STACK_FRAMES = 64;
void* stackFrames[MAX_STACK_FRAMES];
size_t frameCount = backtrace(stackFrames, MAX_STACK_FRAMES);
/*
* TODO: in practice, we may find that we should use backtrace_symbols_fd
* to avoid allocation, rather than use our own custom formatting.
*/
char** strings = backtrace_symbols(stackFrames, frameCount);
if (strings == NULL) {
ALOGE("backtrace_symbols failed: %s", strerror(errno));
return;
}
size_t i;
for (i = 0; i < frameCount; ++i) {
ALOGW("#%-2d %s", i, strings[i]);
}
free(strings);
}
#else
void dvmPrintNativeBackTrace() {
/* Hopefully, you're on an Android device and debuggerd will do this. */
}
#endif
/*
* Abort the VM. We get here on fatal errors. Try very hard not to use
* this; whenever possible, return an error to somebody responsible.
*/
void dvmAbort()
{
/*
* Leave gDvm.lastMessage on the stack frame which can be decoded in the
* tombstone file. This is for situations where we only have tombstone files
* but no logs (ie b/5372634).
*
* For example, in the tombstone file you usually see this:
*
* #00 pc 00050ef2 /system/lib/libdvm.so (dvmAbort)
* #01 pc 00077670 /system/lib/libdvm.so (_Z15dvmClassStartupv)
* :
*
* stack:
* :
* #00 beed2658 00000000
* beed265c 7379732f
* beed2660 2f6d6574
* beed2664 6d617266
* beed2668 726f7765
* beed266c 6f632f6b
* beed2670 6a2e6572
* beed2674 00007261
* beed2678 00000000
*
* The ascii values between beed265c and beed2674 belongs to messageBuffer
* and it can be decoded as "/system/framework/core.jar".
*/
const int messageLength = 512;
char messageBuffer[messageLength] = {0};
int result = 0;
snprintf(messageBuffer, messageLength, "%s", gDvm.lastMessage);
/* So that messageBuffer[] looks like useful stuff to the compiler */
for (int i = 0; i < messageLength && messageBuffer[i]; i++) {
result += messageBuffer[i];
}
ALOGE("VM aborting");
fflush(NULL); // flush all open file buffers
/* JNI-supplied abort hook gets right of first refusal */
if (gDvm.abortHook != NULL)
(*gDvm.abortHook)();
/*
* On the device, debuggerd will give us a stack trace.
* On the host, we have to help ourselves.
*/
dvmPrintNativeBackTrace();
/*
* If we call abort(), all threads in the process receives a SIBABRT.
* debuggerd dumps the stack trace of the main thread, whether or not
* that was the thread that failed.
*
* By stuffing a value into a bogus address, we cause a segmentation
* fault in the current thread, and get a useful log from debuggerd.
* We can also trivially tell the difference between a VM crash and
* a deliberate abort by looking at the fault address.
*/
*((char*)0xdeadd00d) = result;
abort();
/* notreached */
}