2 * Copyright (C) 2008 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * Command-line DEX optimization and verification entry point.
20 * There are three ways to launch this:
21 * (1) From the VM. This takes a dozen args, one of which is a file
22 * descriptor that acts as both input and output. This allows us to
23 * remain ignorant of where the DEX data originally came from.
24 * (2) From installd or another native application. Pass in a file
25 * descriptor for a zip file, a file descriptor for the output, and
26 * a filename for debug messages. Many assumptions are made about
27 * what's going on (verification + optimization are enabled, boot
28 * class path is in BOOTCLASSPATH, etc).
29 * (3) On the host during a build for preoptimization. This behaves
30 * almost the same as (2), except it takes file names instead of
33 * There are some fragile aspects around bootclasspath entries, owing
34 * largely to the VM's history of working on whenever it thought it needed
35 * instead of strictly doing what it was told. If optimizing bootclasspath
36 * entries, always do them in the order in which they appear in the path.
39 #include "libdex/OptInvocation.h"
41 #include "cutils/log.h"
42 #include "cutils/process_name.h"
50 static const char* kClassesDex = "classes.dex";
54 * Extract "classes.dex" from zipFd into "cacheFd", leaving a little space
55 * up front for the DEX optimization header.
57 static int extractAndProcessZip(int zipFd, int cacheFd,
58 const char* debugFileName, bool isBootstrap, const char* bootClassPath,
59 const char* dexoptFlagStr)
68 int dexoptFlags = 0; /* bit flags, from enum DexoptFlags */
69 DexClassVerifyMode verifyMode = VERIFY_MODE_ALL;
70 DexOptimizerMode dexOptMode = OPTIMIZE_MODE_VERIFIED;
72 memset(&zippy, 0, sizeof(zippy));
74 /* make sure we're still at the start of an empty file */
75 if (lseek(cacheFd, 0, SEEK_END) != 0) {
76 ALOGE("DexOptZ: new cache file '%s' is not empty", debugFileName);
81 * Write a skeletal DEX optimization header. We want the classes.dex
82 * to come just after it.
84 err = dexOptCreateEmptyHeader(cacheFd);
88 /* record the file position so we can get back here later */
89 dexOffset = lseek(cacheFd, 0, SEEK_CUR);
94 * Open the zip archive, find the DEX entry.
96 if (dexZipPrepArchive(zipFd, debugFileName, &zippy) != 0) {
97 ALOGW("DexOptZ: unable to open zip archive '%s'", debugFileName);
101 zipEntry = dexZipFindEntry(&zippy, kClassesDex);
102 if (zipEntry == NULL) {
103 ALOGW("DexOptZ: zip archive '%s' does not include %s",
104 debugFileName, kClassesDex);
109 * Extract some info about the zip entry.
111 if (dexZipGetEntryInfo(&zippy, zipEntry, NULL, &uncompLen, NULL, NULL,
112 &modWhen, &crc32) != 0)
114 ALOGW("DexOptZ: zip archive GetEntryInfo failed on %s", debugFileName);
118 uncompLen = uncompLen;
123 * Extract the DEX data into the cache file at the current offset.
125 if (dexZipExtractEntryToFile(&zippy, zipEntry, cacheFd) != 0) {
126 ALOGW("DexOptZ: extraction of %s from %s failed",
127 kClassesDex, debugFileName);
131 /* Parse the options. */
132 if (dexoptFlagStr[0] != '\0') {
136 opc = strstr(dexoptFlagStr, "v="); /* verification */
139 case 'n': verifyMode = VERIFY_MODE_NONE; break;
140 case 'r': verifyMode = VERIFY_MODE_REMOTE; break;
141 case 'a': verifyMode = VERIFY_MODE_ALL; break;
146 opc = strstr(dexoptFlagStr, "o="); /* optimization */
149 case 'n': dexOptMode = OPTIMIZE_MODE_NONE; break;
150 case 'v': dexOptMode = OPTIMIZE_MODE_VERIFIED; break;
151 case 'a': dexOptMode = OPTIMIZE_MODE_ALL; break;
152 case 'f': dexOptMode = OPTIMIZE_MODE_FULL; break;
157 opc = strstr(dexoptFlagStr, "m=y"); /* register map */
159 dexoptFlags |= DEXOPT_GEN_REGISTER_MAPS;
162 opc = strstr(dexoptFlagStr, "u="); /* uniprocessor target */
165 case 'y': dexoptFlags |= DEXOPT_UNIPROCESSOR; break;
166 case 'n': dexoptFlags |= DEXOPT_SMP; break;
173 * Prep the VM and perform the optimization.
176 if (dvmPrepForDexOpt(bootClassPath, dexOptMode, verifyMode,
179 ALOGE("DexOptZ: VM init failed");
185 /* do the optimization */
186 if (!dvmContinueOptimization(cacheFd, dexOffset, uncompLen, debugFileName,
187 modWhen, crc32, isBootstrap))
189 ALOGE("Optimization failed");
193 /* we don't shut the VM down -- process is about to exit */
198 dexZipCloseArchive(&zippy);
203 * Common functionality for normal device-side processing as well as
206 static int processZipFile(int zipFd, int cacheFd, const char* zipName,
207 const char *dexoptFlags)
209 char* bcpCopy = NULL;
212 * Check to see if this is a bootstrap class entry. If so, truncate
215 const char* bcp = getenv("BOOTCLASSPATH");
217 ALOGE("DexOptZ: BOOTCLASSPATH not set");
221 bool isBootstrap = false;
222 const char* match = strstr(bcp, zipName);
225 * TODO: we have a partial string match, but that doesn't mean
226 * we've matched an entire path component. We should make sure
227 * that we're matching on the full zipName, and if not we
228 * should re-do the strstr starting at (match+1).
230 * The scenario would be a bootclasspath with something like
231 * "/system/framework/core.jar" while we're trying to optimize
232 * "/framework/core.jar". Not very likely since all paths are
233 * absolute and end with ".jar", but not impossible.
235 int matchOffset = match - bcp;
236 if (matchOffset > 0 && bcp[matchOffset-1] == ':')
238 ALOGV("DexOptZ: found '%s' in bootclasspath, cutting off at %d",
239 zipName, matchOffset);
240 bcpCopy = strdup(bcp);
241 bcpCopy[matchOffset] = '\0';
244 ALOGD("DexOptZ: truncated BOOTCLASSPATH to '%s'", bcp);
248 int result = extractAndProcessZip(zipFd, cacheFd, zipName, isBootstrap,
255 /* advance to the next arg and extract it */
256 #define GET_ARG(_var, _func, _msg) \
259 (_var) = _func(*++argv, &endp, 0); \
260 if (*endp != '\0') { \
261 ALOGE("%s '%s'", _msg, *argv); \
268 * Parse arguments. We want:
269 * 0. (name of dexopt command -- ignored)
271 * 2. zip fd (input, read-only)
272 * 3. cache fd (output, read-write, locked with flock)
273 * 4. filename of zipfile being optimized (used for debug messages and
274 * for comparing against BOOTCLASSPATH; does not need to be
275 * accessible or even exist)
278 * The BOOTCLASSPATH environment variable is assumed to hold the correct
279 * boot class path. If the filename provided appears in the boot class
280 * path, the path will be truncated just before that entry (so that, if
281 * you were to dexopt "core.jar", your bootclasspath would be empty).
283 * This does not try to normalize the boot class path name, so the
284 * filename test won't catch you if you get creative.
286 static int fromZip(int argc, char* const argv[])
291 char* bcpCopy = NULL;
292 const char* dexoptFlags;
295 ALOGE("Wrong number of args for --zip (found %d)", argc);
303 GET_ARG(zipFd, strtol, "bad zip fd");
304 GET_ARG(cacheFd, strtol, "bad cache fd");
307 dexoptFlags = *++argv;
310 result = processZipFile(zipFd, cacheFd, zipName, dexoptFlags);
317 * Parse arguments for a preoptimization run. This is when dalvikvm is run
318 * on a host to optimize dex files for eventual running on a (different)
320 * 0. (name of dexopt command -- ignored)
323 * 3. output file name
326 * The BOOTCLASSPATH environment variable is assumed to hold the correct
327 * boot class path. If the filename provided appears in the boot class
328 * path, the path will be truncated just before that entry (so that, if
329 * you were to dexopt "core.jar", your bootclasspath would be empty).
331 * This does not try to normalize the boot class path name, so the
332 * filename test won't catch you if you get creative.
334 static int preopt(int argc, char* const argv[])
342 * Use stderr here, since this variant is meant to be called on
345 fprintf(stderr, "Wrong number of args for --preopt (found %d)\n",
350 const char* zipName = argv[2];
351 const char* outName = argv[3];
352 const char* dexoptFlags = argv[4];
354 if (strstr(dexoptFlags, "u=y") == NULL &&
355 strstr(dexoptFlags, "u=n") == NULL)
357 fprintf(stderr, "Either 'u=y' or 'u=n' must be specified\n");
361 zipFd = open(zipName, O_RDONLY);
367 outFd = open(outName, O_RDWR | O_EXCL | O_CREAT, 0666);
373 result = processZipFile(zipFd, outFd, zipName, dexoptFlags);
388 * Parse arguments for an "old-style" invocation directly from the VM.
390 * Here's what we want:
391 * 0. (name of dexopt command -- ignored)
393 * 2. DALVIK_VM_BUILD value, as a sanity check
394 * 3. file descriptor, locked with flock, for DEX file being optimized
395 * 4. DEX offset within file
397 * 6. filename of file being optimized (for debug messages only)
398 * 7. modification date of source (goes into dependency section)
399 * 8. CRC of source (goes into dependency section)
400 * 9. flags (optimization level, isBootstrap)
401 * 10. bootclasspath entry #1
402 * 11. bootclasspath entry #2
405 * dvmOptimizeDexFile() in dalvik/vm/analysis/DexOptimize.c builds the
406 * argument list and calls this executable.
408 * The bootclasspath entries become the dependencies for this DEX file.
410 * The open file descriptor MUST NOT be for one of the bootclasspath files.
411 * The parent has the descriptor locked, and we'll try to lock it again as
412 * part of processing the bootclasspath. (We can catch this and return
413 * an error by comparing filenames or by opening the bootclasspath files
414 * and stat()ing them for inode numbers).
416 static int fromDex(int argc, char* const argv[])
419 bool vmStarted = false;
420 char* bootClassPath = NULL;
421 int fd, flags, vmBuildVersion;
423 const char* debugFileName;
426 bool onlyOptVerifiedDex = false;
427 DexClassVerifyMode verifyMode;
428 DexOptimizerMode dexOptMode;
431 /* don't have all mandatory args */
432 ALOGE("Not enough arguments for --dex (found %d)", argc);
443 GET_ARG(vmBuildVersion, strtol, "bad vm build");
444 if (vmBuildVersion != DALVIK_VM_BUILD) {
445 ALOGE("DexOpt: build rev does not match VM: %d vs %d",
446 vmBuildVersion, DALVIK_VM_BUILD);
449 GET_ARG(fd, strtol, "bad fd");
450 GET_ARG(offset, strtol, "bad offset");
451 GET_ARG(length, strtol, "bad length");
452 debugFileName = *++argv;
454 GET_ARG(modWhen, strtoul, "bad modWhen");
455 GET_ARG(crc, strtoul, "bad crc");
456 GET_ARG(flags, strtol, "bad flags");
458 ALOGV("Args: fd=%d off=%ld len=%ld name='%s' mod=%#x crc=%#x flg=%d (argc=%d)",
459 fd, offset, length, debugFileName, modWhen, crc, flags, argc);
463 bootClassPath = strdup("");
470 for (i = 0, argp = argv; i < argc; i++) {
472 ALOGV("DEP: '%s'", *argp);
473 bcpLen += strlen(*argp) + 1;
476 cp = bootClassPath = (char*) malloc(bcpLen +1);
477 for (i = 0, argp = argv; i < argc; i++) {
481 strLen = strlen(*argp);
484 memcpy(cp, *argp, strLen);
489 assert((int) strlen(bootClassPath) == bcpLen-1);
491 ALOGV(" bootclasspath is '%s'", bootClassPath);
493 /* start the VM partway */
495 /* ugh -- upgrade these to a bit field if they get any more complex */
496 if ((flags & DEXOPT_VERIFY_ENABLED) != 0) {
497 if ((flags & DEXOPT_VERIFY_ALL) != 0)
498 verifyMode = VERIFY_MODE_ALL;
500 verifyMode = VERIFY_MODE_REMOTE;
502 verifyMode = VERIFY_MODE_NONE;
504 if ((flags & DEXOPT_OPT_ENABLED) != 0) {
505 if ((flags & DEXOPT_OPT_ALL) != 0)
506 dexOptMode = OPTIMIZE_MODE_ALL;
508 dexOptMode = OPTIMIZE_MODE_VERIFIED;
510 dexOptMode = OPTIMIZE_MODE_NONE;
513 if (dvmPrepForDexOpt(bootClassPath, dexOptMode, verifyMode, flags) != 0) {
514 ALOGE("VM init failed");
520 /* do the optimization */
521 if (!dvmContinueOptimization(fd, offset, length, debugFileName,
522 modWhen, crc, (flags & DEXOPT_IS_BOOTSTRAP) != 0))
524 ALOGE("Optimization failed");
532 * In theory we should gracefully shut the VM down at this point. In
533 * practice that only matters if we're checking for memory leaks with
534 * valgrind -- simply exiting is much faster.
536 * As it turns out, the DEX optimizer plays a little fast and loose
537 * with class loading. We load all of the classes from a partially-
538 * formed DEX file, which is unmapped when we're done. If we want to
539 * do clean shutdown here, perhaps for testing with valgrind, we need
540 * to skip the munmap call there.
544 ALOGI("DexOpt shutting down, result=%d", result);
550 ALOGV("DexOpt command complete (result=%d)", result);
555 * Main entry point. Decide where to go.
557 int main(int argc, char* const argv[])
559 set_process_name("dexopt");
561 setvbuf(stdout, NULL, _IONBF, 0);
564 if (strcmp(argv[1], "--zip") == 0)
565 return fromZip(argc, argv);
566 else if (strcmp(argv[1], "--dex") == 0)
567 return fromDex(argc, argv);
568 else if (strcmp(argv[1], "--preopt") == 0)
569 return preopt(argc, argv);
574 "Short version: Don't use this.\n\n"
575 "Slightly longer version: This system-internal tool is used to\n"
576 "produce optimized dex files. See the source code for details.\n");