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/*
* 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.
*/
/*
* Utility functions for dealing with optimized dex files.
*/
#include "vm/DalvikVersion.h"
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <errno.h>
#include "OptInvocation.h"
#include "DexFile.h"
static const char* kCacheDirectoryName = "dalvik-cache";
static const char* kClassesDex = "classes.dex";
#if defined(__aarch64__)
static const char* kInstructionSet = "arm64";
#elif defined(__arm__)
static const char* kInstructionSet = "arm";
#elif defined(__i386__)
static const char* kInstructionSet = "x86";
#elif defined(__mips__)
static const char* kInstructionSet = "mips";
#elif defined(__x86_64__)
static const char* kInstructionSet = "x86_64";
#else
#error Unsupported instruction set.
#endif
static int dexOptMkdir(const char* path, int mode)
{
#ifdef _WIN32
return mkdir(path);
#else
return mkdir(path, mode);
#endif
}
/*
* Given the filename of a .jar or .dex file, construct the DEX file cache
* name.
*
* For a Jar, "subFileName" is the name of the entry (usually "classes.dex").
* For a DEX, it may be NULL.
*
* Returns a newly-allocated string, or NULL on failure.
*/
char* dexOptGenerateCacheFileName(const char* fileName, const char* subFileName)
{
char nameBuf[512];
char absoluteFile[sizeof(nameBuf)];
const size_t kBufLen = sizeof(nameBuf) - 1;
const char* dataRoot;
char* cp;
/*
* Get the absolute path of the Jar or DEX file.
*/
absoluteFile[0] = '\0';
if (fileName[0] != '/') {
/*
* Generate the absolute path. This doesn't do everything it
* should, e.g. if filename is "./out/whatever" it doesn't crunch
* the leading "./" out, but it'll do.
*/
if (getcwd(absoluteFile, kBufLen) == NULL) {
ALOGE("Can't get CWD while opening jar file");
return NULL;
}
strncat(absoluteFile, "/", kBufLen - strlen(absoluteFile));
}
strncat(absoluteFile, fileName, kBufLen - strlen(absoluteFile));
/*
* Append the name of the Jar file entry, if any. This is not currently
* required, but will be if we start putting more than one DEX file
* in a Jar.
*/
if (subFileName != NULL) {
strncat(absoluteFile, "/", kBufLen - strlen(absoluteFile));
strncat(absoluteFile, subFileName, kBufLen - strlen(absoluteFile));
}
/* Turn the path into a flat filename by replacing
* any slashes after the first one with '@' characters.
*/
cp = absoluteFile + 1;
while (*cp != '\0') {
if (*cp == '/') {
*cp = '@';
}
cp++;
}
/* Build the name of the cache directory.
*/
dataRoot = getenv("ANDROID_DATA");
if (dataRoot == NULL)
dataRoot = "/data";
snprintf(nameBuf, kBufLen, "%s/%s", dataRoot, kCacheDirectoryName);
if (strcmp(dataRoot, "/data") != 0) {
int result = dexOptMkdir(nameBuf, 0700);
if (result != 0 && errno != EEXIST) {
ALOGE("Failed to create dalvik-cache directory %s: %s", nameBuf, strerror(errno));
return NULL;
}
}
snprintf(nameBuf, kBufLen, "%s/%s/%s", dataRoot, kCacheDirectoryName, kInstructionSet);
if (strcmp(dataRoot, "/data") != 0) {
int result = dexOptMkdir(nameBuf, 0700);
if (result != 0 && errno != EEXIST) {
ALOGE("Failed to create dalvik-cache directory %s: %s", nameBuf, strerror(errno));
return NULL;
}
}
/* Tack on the file name for the actual cache file path.
*/
strncat(nameBuf, absoluteFile, kBufLen - strlen(nameBuf));
ALOGV("Cache file for '%s' '%s' is '%s'", fileName, subFileName, nameBuf);
return strdup(nameBuf);
}
/*
* Create a skeletal "opt" header in a new file. Most of the fields are
* initialized to garbage, but we fill in "dexOffset" so others can
* see how large the header is.
*
* "fd" must be positioned at the start of the file. On return, it will
* be positioned just past the header, and the place where the DEX data
* should go.
*
* Returns 0 on success, errno on failure.
*/
int dexOptCreateEmptyHeader(int fd)
{
DexOptHeader optHdr;
ssize_t actual;
assert(lseek(fd, 0, SEEK_CUR) == 0);
/*
* The data is only expected to be readable on the current system, so
* we just write the structure. We do need the file offset to be 64-bit
* aligned to fulfill a DEX requirement.
*/
assert((sizeof(optHdr) & 0x07) == 0);
memset(&optHdr, 0xff, sizeof(optHdr));
optHdr.dexOffset = sizeof(optHdr);
actual = write(fd, &optHdr, sizeof(optHdr));
if (actual != sizeof(optHdr)) {
int err = errno ? errno : -1;
ALOGE("opt header write failed: %s", strerror(errno));
return errno;
}
return 0;
}
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