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/*
* Copyright (C) 2011 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.
*/
#include "image_space.h"
#include <sys/types.h>
#include <sys/wait.h>
#include "base/stl_util.h"
#include "base/unix_file/fd_file.h"
#include "gc/accounting/space_bitmap-inl.h"
#include "mirror/art_method.h"
#include "mirror/class-inl.h"
#include "mirror/object-inl.h"
#include "oat_file.h"
#include "os.h"
#include "runtime.h"
#include "space-inl.h"
#include "utils.h"
namespace art {
namespace gc {
namespace space {
AtomicInteger ImageSpace::bitmap_index_(0);
ImageSpace::ImageSpace(const std::string& name, MemMap* mem_map,
accounting::SpaceBitmap* live_bitmap)
: MemMapSpace(name, mem_map, mem_map->Size(), kGcRetentionPolicyNeverCollect) {
DCHECK(live_bitmap != NULL);
live_bitmap_.reset(live_bitmap);
}
static bool GenerateImage(const std::string& image_file_name) {
const std::string boot_class_path_string(Runtime::Current()->GetBootClassPathString());
std::vector<std::string> boot_class_path;
Split(boot_class_path_string, ':', boot_class_path);
if (boot_class_path.empty()) {
LOG(FATAL) << "Failed to generate image because no boot class path specified";
}
std::vector<std::string> arg_vector;
std::string dex2oat(GetAndroidRoot());
dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat");
arg_vector.push_back(dex2oat);
std::string image_option_string("--image=");
image_option_string += image_file_name;
arg_vector.push_back(image_option_string);
arg_vector.push_back("--runtime-arg");
arg_vector.push_back("-Xms64m");
arg_vector.push_back("--runtime-arg");
arg_vector.push_back("-Xmx64m");
for (size_t i = 0; i < boot_class_path.size(); i++) {
arg_vector.push_back(std::string("--dex-file=") + boot_class_path[i]);
}
std::string oat_file_option_string("--oat-file=");
oat_file_option_string += image_file_name;
oat_file_option_string.erase(oat_file_option_string.size() - 3);
oat_file_option_string += "oat";
arg_vector.push_back(oat_file_option_string);
arg_vector.push_back(StringPrintf("--base=0x%x", ART_BASE_ADDRESS));
if (kIsTargetBuild) {
arg_vector.push_back("--image-classes-zip=/system/framework/framework.jar");
arg_vector.push_back("--image-classes=preloaded-classes");
} else {
arg_vector.push_back("--host");
}
std::string command_line(Join(arg_vector, ' '));
LOG(INFO) << "GenerateImage: " << command_line;
// Convert the args to char pointers.
std::vector<char*> char_args;
for (std::vector<std::string>::iterator it = arg_vector.begin(); it != arg_vector.end();
++it) {
char_args.push_back(const_cast<char*>(it->c_str()));
}
char_args.push_back(NULL);
// fork and exec dex2oat
pid_t pid = fork();
if (pid == 0) {
// no allocation allowed between fork and exec
// change process groups, so we don't get reaped by ProcessManager
setpgid(0, 0);
execv(dex2oat.c_str(), &char_args[0]);
PLOG(FATAL) << "execv(" << dex2oat << ") failed";
return false;
} else {
if (pid == -1) {
PLOG(ERROR) << "fork failed";
}
// wait for dex2oat to finish
int status;
pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
if (got_pid != pid) {
PLOG(ERROR) << "waitpid failed: wanted " << pid << ", got " << got_pid;
return false;
}
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
LOG(ERROR) << dex2oat << " failed: " << command_line;
return false;
}
}
return true;
}
ImageSpace* ImageSpace::Create(const std::string& original_image_file_name) {
if (OS::FileExists(original_image_file_name.c_str())) {
// If the /system file exists, it should be up-to-date, don't try to generate
return space::ImageSpace::Init(original_image_file_name, false);
}
// If the /system file didn't exist, we need to use one from the dalvik-cache.
// If the cache file exists, try to open, but if it fails, regenerate.
// If it does not exist, generate.
std::string image_file_name(GetDalvikCacheFilenameOrDie(original_image_file_name));
if (OS::FileExists(image_file_name.c_str())) {
space::ImageSpace* image_space = space::ImageSpace::Init(image_file_name, true);
if (image_space != NULL) {
return image_space;
}
}
CHECK(GenerateImage(image_file_name)) << "Failed to generate image: " << image_file_name;
return space::ImageSpace::Init(image_file_name, true);
}
void ImageSpace::VerifyImageAllocations() {
byte* current = Begin() + RoundUp(sizeof(ImageHeader), kObjectAlignment);
while (current < End()) {
DCHECK_ALIGNED(current, kObjectAlignment);
const mirror::Object* obj = reinterpret_cast<const mirror::Object*>(current);
CHECK(live_bitmap_->Test(obj));
CHECK(obj->GetClass() != nullptr) << "Image object at address " << obj << " has null class";
current += RoundUp(obj->SizeOf(), kObjectAlignment);
}
}
ImageSpace* ImageSpace::Init(const std::string& image_file_name, bool validate_oat_file) {
CHECK(!image_file_name.empty());
uint64_t start_time = 0;
if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
start_time = NanoTime();
LOG(INFO) << "ImageSpace::Init entering image_file_name=" << image_file_name;
}
UniquePtr<File> file(OS::OpenFileForReading(image_file_name.c_str()));
if (file.get() == NULL) {
LOG(ERROR) << "Failed to open " << image_file_name;
return NULL;
}
ImageHeader image_header;
bool success = file->ReadFully(&image_header, sizeof(image_header));
if (!success || !image_header.IsValid()) {
LOG(ERROR) << "Invalid image header " << image_file_name;
return NULL;
}
// Note: The image header is part of the image due to mmap page alignment required of offset.
UniquePtr<MemMap> map(MemMap::MapFileAtAddress(image_header.GetImageBegin(),
image_header.GetImageSize(),
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_FIXED,
file->Fd(),
0,
false));
if (map.get() == NULL) {
LOG(ERROR) << "Failed to map " << image_file_name;
return NULL;
}
CHECK_EQ(image_header.GetImageBegin(), map->Begin());
DCHECK_EQ(0, memcmp(&image_header, map->Begin(), sizeof(ImageHeader)));
UniquePtr<MemMap> image_map(MemMap::MapFileAtAddress(nullptr, image_header.GetImageBitmapSize(),
PROT_READ, MAP_PRIVATE,
file->Fd(), image_header.GetBitmapOffset(),
false));
CHECK(image_map.get() != nullptr) << "failed to map image bitmap";
size_t bitmap_index = bitmap_index_.fetch_add(1);
std::string bitmap_name(StringPrintf("imagespace %s live-bitmap %u", image_file_name.c_str(),
bitmap_index));
UniquePtr<accounting::SpaceBitmap> bitmap(
accounting::SpaceBitmap::CreateFromMemMap(bitmap_name, image_map.release(),
reinterpret_cast<byte*>(map->Begin()),
map->Size()));
CHECK(bitmap.get() != nullptr) << "could not create " << bitmap_name;
Runtime* runtime = Runtime::Current();
mirror::Object* resolution_method = image_header.GetImageRoot(ImageHeader::kResolutionMethod);
runtime->SetResolutionMethod(down_cast<mirror::ArtMethod*>(resolution_method));
mirror::Object* callee_save_method = image_header.GetImageRoot(ImageHeader::kCalleeSaveMethod);
runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kSaveAll);
callee_save_method = image_header.GetImageRoot(ImageHeader::kRefsOnlySaveMethod);
runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kRefsOnly);
callee_save_method = image_header.GetImageRoot(ImageHeader::kRefsAndArgsSaveMethod);
runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kRefsAndArgs);
UniquePtr<ImageSpace> space(new ImageSpace(image_file_name, map.release(), bitmap.release()));
if (kIsDebugBuild) {
space->VerifyImageAllocations();
}
space->oat_file_.reset(space->OpenOatFile());
if (space->oat_file_.get() == NULL) {
LOG(ERROR) << "Failed to open oat file for image: " << image_file_name;
return NULL;
}
if (validate_oat_file && !space->ValidateOatFile()) {
LOG(WARNING) << "Failed to validate oat file for image: " << image_file_name;
return NULL;
}
if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
LOG(INFO) << "ImageSpace::Init exiting (" << PrettyDuration(NanoTime() - start_time)
<< ") " << *space.get();
}
return space.release();
}
OatFile* ImageSpace::OpenOatFile() const {
const Runtime* runtime = Runtime::Current();
const ImageHeader& image_header = GetImageHeader();
// Grab location but don't use Object::AsString as we haven't yet initialized the roots to
// check the down cast
mirror::String* oat_location =
down_cast<mirror::String*>(image_header.GetImageRoot(ImageHeader::kOatLocation));
std::string oat_filename;
oat_filename += runtime->GetHostPrefix();
oat_filename += oat_location->ToModifiedUtf8();
OatFile* oat_file = OatFile::Open(oat_filename, oat_filename, image_header.GetOatDataBegin(),
!Runtime::Current()->IsCompiler());
if (oat_file == NULL) {
LOG(ERROR) << "Failed to open oat file " << oat_filename << " referenced from image.";
return NULL;
}
uint32_t oat_checksum = oat_file->GetOatHeader().GetChecksum();
uint32_t image_oat_checksum = image_header.GetOatChecksum();
if (oat_checksum != image_oat_checksum) {
LOG(ERROR) << "Failed to match oat file checksum " << std::hex << oat_checksum
<< " to expected oat checksum " << std::hex << image_oat_checksum
<< " in image";
return NULL;
}
return oat_file;
}
bool ImageSpace::ValidateOatFile() const {
CHECK(oat_file_.get() != NULL);
for (const OatFile::OatDexFile* oat_dex_file : oat_file_->GetOatDexFiles()) {
const std::string& dex_file_location = oat_dex_file->GetDexFileLocation();
uint32_t dex_file_location_checksum;
if (!DexFile::GetChecksum(dex_file_location.c_str(), dex_file_location_checksum)) {
LOG(WARNING) << "ValidateOatFile could not find checksum for " << dex_file_location;
return false;
}
if (dex_file_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) {
LOG(WARNING) << "ValidateOatFile found checksum mismatch between oat file "
<< oat_file_->GetLocation() << " and dex file " << dex_file_location
<< " (" << oat_dex_file->GetDexFileLocationChecksum() << " != "
<< dex_file_location_checksum << ")";
return false;
}
}
return true;
}
OatFile& ImageSpace::ReleaseOatFile() {
CHECK(oat_file_.get() != NULL);
return *oat_file_.release();
}
void ImageSpace::Dump(std::ostream& os) const {
os << GetType()
<< "begin=" << reinterpret_cast<void*>(Begin())
<< ",end=" << reinterpret_cast<void*>(End())
<< ",size=" << PrettySize(Size())
<< ",name=\"" << GetName() << "\"]";
}
} // namespace space
} // namespace gc
} // namespace art