src/oat_file.cc - platform/art - Git at Google

 // Copyright 2011 Google Inc. All Rights Reserved.

 #include "oat_file.h"

 #include <sys/mman.h>

 #include "file.h"
 #include "os.h"
 #include "stl_util.h"

 namespace art {

 std::string OatFile::DexFilenameToOatFilename(const std::string& location) {
   CHECK(IsValidDexFilename(location) || IsValidZipFilename(location));
   std::string oat_location(location.substr(0, location.size() - 3));
   oat_location += "oat";
   return oat_location;
 }

 OatFile* OatFile::Open(const std::string& filename,
                        const std::string& strip_location_prefix,
                        byte* requested_base) {
   StringPiece location = filename;
   if (!location.starts_with(strip_location_prefix)) {
     LOG(ERROR) << filename << " does not start with " << strip_location_prefix;
     return NULL;
   }
   location.remove_prefix(strip_location_prefix.size());

   UniquePtr<OatFile> oat_file(new OatFile(location.ToString()));
   bool success = oat_file->Read(filename, requested_base);
   if (!success) {
     return NULL;
   }
   return oat_file.release();
 }

 OatFile::OatFile(const std::string& filename) : location_(filename) {}

 OatFile::~OatFile() {
   STLDeleteValues(&oat_dex_files_);
 }

 bool OatFile::Read(const std::string& filename, byte* requested_base) {
   UniquePtr<File> file(OS::OpenFile(filename.c_str(), false));
   if (file.get() == NULL) {
     return false;
   }

   OatHeader oat_header;
   bool success = file->ReadFully(&oat_header, sizeof(oat_header));
   if (!success || !oat_header.IsValid()) {
     LOG(WARNING) << "Invalid oat header " << filename;
     return false;
   }

   UniquePtr<MemMap> map(MemMap::Map(requested_base,
                                     file->Length(),
                                     PROT_READ,
                                     MAP_PRIVATE | ((requested_base != NULL) ? MAP_FIXED : 0),
                                     file->Fd(),
                                     0));
   if (map.get() == NULL) {
     LOG(WARNING) << "Failed to map oat file " << filename;
     return false;
   }
   CHECK(requested_base == 0 || requested_base == map->GetAddress()) << map->GetAddress();
   DCHECK_EQ(0, memcmp(&oat_header, map->GetAddress(), sizeof(OatHeader)));

   off_t code_offset = oat_header.GetExecutableOffset();
   if (code_offset < file->Length()) {
     byte* code_address = map->GetAddress() + code_offset;
     size_t code_length = file->Length() - code_offset;
     if (mprotect(code_address, code_length, PROT_READ | PROT_EXEC) != 0) {
       PLOG(ERROR) << "Failed to make oat code executable.";
       return false;
     }
   } else {
     // its possible to have no code if all the methods were abstract, native, etc
     DCHECK_EQ(code_offset, RoundUp(file->Length(), kPageSize));
   }

   const byte* oat = map->GetAddress();
   oat += sizeof(OatHeader);
   CHECK_LT(oat, map->GetLimit());
   for (size_t i = 0; i < oat_header.GetDexFileCount(); i++) {
     size_t dex_file_location_size = *reinterpret_cast<const uint32_t*>(oat);
     oat += sizeof(dex_file_location_size);
     CHECK_LT(oat, map->GetLimit());

     const char* dex_file_location_data = reinterpret_cast<const char*>(oat);
     oat += dex_file_location_size;
     CHECK_LT(oat, map->GetLimit());

     std::string dex_file_location(dex_file_location_data, dex_file_location_size);

     uint32_t dex_file_checksum = *reinterpret_cast<const uint32_t*>(oat);
     oat += sizeof(dex_file_checksum);
     CHECK_LT(oat, map->GetLimit());

     uint32_t classes_offset = *reinterpret_cast<const uint32_t*>(oat);
     CHECK_GT(classes_offset, 0U);
     CHECK_LT(classes_offset, static_cast<uint32_t>(file->Length()));
     oat += sizeof(classes_offset);
     CHECK_LT(oat, map->GetLimit());

     uint32_t* classes_pointer = reinterpret_cast<uint32_t*>(map->GetAddress() + classes_offset);

     oat_dex_files_[dex_file_location] = new OatDexFile(this,
                                                        dex_file_location,
                                                        dex_file_checksum,
                                                        classes_pointer);
   }

   mem_map_.reset(map.release());
   return true;
 }

 const OatHeader& OatFile::GetOatHeader() const {
   return *reinterpret_cast<const OatHeader*>(GetBase());
 }

 const byte* OatFile::GetBase() const {
   CHECK(mem_map_->GetAddress() != NULL);
   return mem_map_->GetAddress();
 }

 const byte* OatFile::GetLimit() const {
   CHECK(mem_map_->GetLimit() != NULL);
   return mem_map_->GetLimit();
 }

 const OatFile::OatDexFile* OatFile::GetOatDexFile(const std::string& dex_file_location,
                                                   bool warn_if_not_found) const {
   Table::const_iterator it = oat_dex_files_.find(dex_file_location);
   if (it == oat_dex_files_.end()) {
     if (warn_if_not_found) {
       LOG(WARNING) << "Failed to find OatDexFile for DexFile " << dex_file_location;
     }
     return NULL;
   }
   return it->second;
 }

 std::vector<const OatFile::OatDexFile*> OatFile::GetOatDexFiles() const {
   std::vector<const OatFile::OatDexFile*> result;
   for (Table::const_iterator it = oat_dex_files_.begin(); it != oat_dex_files_.end(); ++it) {
     result.push_back(it->second);
   }
   return result;
 }

 OatFile::OatDexFile::OatDexFile(const OatFile* oat_file,
                                 std::string dex_file_location,
                                 uint32_t dex_file_checksum,
                                 uint32_t* classes_pointer)
     : oat_file_(oat_file),
       dex_file_location_(dex_file_location),
       dex_file_checksum_(dex_file_checksum),
       classes_pointer_(classes_pointer) {}

 OatFile::OatDexFile::~OatDexFile() {}

 const OatFile::OatClass* OatFile::OatDexFile::GetOatClass(uint32_t class_def_index) const {
   uint32_t methods_offset = classes_pointer_[class_def_index];
   const byte* methods_pointer = oat_file_->GetBase() + methods_offset;
   CHECK_LT(methods_pointer, oat_file_->GetLimit());
   return new OatClass(oat_file_, reinterpret_cast<const OatMethodOffsets*>(methods_pointer));
 }

 OatFile::OatClass::OatClass(const OatFile* oat_file, const OatMethodOffsets* methods_pointer)
     : oat_file_(oat_file), methods_pointer_(methods_pointer) {}

 OatFile::OatClass::~OatClass() {}

 const OatFile::OatMethod OatFile::OatClass::GetOatMethod(uint32_t method_index) const {
   const OatMethodOffsets& oat_method_offsets = methods_pointer_[method_index];
   return OatMethod(
       oat_file_->GetBase(),
       oat_method_offsets.code_offset_,
       oat_method_offsets.frame_size_in_bytes_,
       oat_method_offsets.core_spill_mask_,
       oat_method_offsets.fp_spill_mask_,
       oat_method_offsets.mapping_table_offset_,
       oat_method_offsets.vmap_table_offset_,
       oat_method_offsets.invoke_stub_offset_);
 }

 OatFile::OatMethod::OatMethod(const byte* base,
                               const uint32_t code_offset,
                               const size_t frame_size_in_bytes,
                               const uint32_t core_spill_mask,
                               const uint32_t fp_spill_mask,
                               const uint32_t mapping_table_offset,
                               const uint32_t vmap_table_offset,
                               const uint32_t invoke_stub_offset)
   : base_(base),
     code_offset_(code_offset),
     frame_size_in_bytes_(frame_size_in_bytes),
     core_spill_mask_(core_spill_mask),
     fp_spill_mask_(fp_spill_mask),
     mapping_table_offset_(mapping_table_offset),
     vmap_table_offset_(vmap_table_offset),
     invoke_stub_offset_(invoke_stub_offset) {

 #ifndef NDEBUG
   if (mapping_table_offset_ != 0) {  // implies non-native, non-stub code
     if (vmap_table_offset_ == 0) {
       DCHECK_EQ(0U, static_cast<uint32_t>(__builtin_popcount(core_spill_mask_) + __builtin_popcount(fp_spill_mask_)));
     } else {
       const uint16_t* vmap_table_ = reinterpret_cast<const uint16_t*>(base_ + vmap_table_offset_);
       DCHECK_EQ(vmap_table_[0], static_cast<uint32_t>(__builtin_popcount(core_spill_mask_) + __builtin_popcount(fp_spill_mask_)));
     }
   } else {
     DCHECK(vmap_table_offset_ == 0);
   }
 #endif
 }

 OatFile::OatMethod::~OatMethod() {}

 void OatFile::OatMethod::LinkMethodPointers(Method* method) const {
   CHECK(method != NULL);
   method->SetCode(GetCode());
   method->SetFrameSizeInBytes(frame_size_in_bytes_);
   method->SetCoreSpillMask(core_spill_mask_);
   method->SetFpSpillMask(fp_spill_mask_);
   method->SetMappingTable(GetMappingTable());
   method->SetVmapTable(GetVmapTable());
   method->SetInvokeStub(GetInvokeStub());
 }

 void OatFile::OatMethod::LinkMethodOffsets(Method* method) const {
   CHECK(method != NULL);
   method->SetOatCodeOffset(GetCodeOffset());
   method->SetFrameSizeInBytes(GetFrameSizeInBytes());
   method->SetCoreSpillMask(GetCoreSpillMask());
   method->SetFpSpillMask(GetFpSpillMask());
   method->SetOatMappingTableOffset(GetMappingTableOffset());
   method->SetOatVmapTableOffset(GetVmapTableOffset());
   method->SetOatInvokeStubOffset(GetInvokeStubOffset());
 }

 }  // namespace art
	// Copyright 2011 Google Inc. All Rights Reserved.

	#include "oat_file.h"

	#include <sys/mman.h>

	#include "file.h"
	#include "os.h"
	#include "stl_util.h"

	namespace art {

	std::string OatFile::DexFilenameToOatFilename(const std::string& location) {
	CHECK(IsValidDexFilename(location) \|\| IsValidZipFilename(location));
	std::string oat_location(location.substr(0, location.size() - 3));
	oat_location += "oat";
	return oat_location;
	}

	OatFile* OatFile::Open(const std::string& filename,
	const std::string& strip_location_prefix,
	byte* requested_base) {
	StringPiece location = filename;
	if (!location.starts_with(strip_location_prefix)) {
	LOG(ERROR) << filename << " does not start with " << strip_location_prefix;
	return NULL;
	}
	location.remove_prefix(strip_location_prefix.size());

	UniquePtr<OatFile> oat_file(new OatFile(location.ToString()));
	bool success = oat_file->Read(filename, requested_base);
	if (!success) {
	return NULL;
	}
	return oat_file.release();
	}

	OatFile::OatFile(const std::string& filename) : location_(filename) {}

	OatFile::~OatFile() {
	STLDeleteValues(&oat_dex_files_);
	}

	bool OatFile::Read(const std::string& filename, byte* requested_base) {
	UniquePtr<File> file(OS::OpenFile(filename.c_str(), false));
	if (file.get() == NULL) {
	return false;
	}

	OatHeader oat_header;
	bool success = file->ReadFully(&oat_header, sizeof(oat_header));
	if (!success \|\| !oat_header.IsValid()) {
	LOG(WARNING) << "Invalid oat header " << filename;
	return false;
	}

	UniquePtr<MemMap> map(MemMap::Map(requested_base,
	file->Length(),
	PROT_READ,
	MAP_PRIVATE \| ((requested_base != NULL) ? MAP_FIXED : 0),
	file->Fd(),
	0));
	if (map.get() == NULL) {
	LOG(WARNING) << "Failed to map oat file " << filename;
	return false;
	}
	CHECK(requested_base == 0 \|\| requested_base == map->GetAddress()) << map->GetAddress();
	DCHECK_EQ(0, memcmp(&oat_header, map->GetAddress(), sizeof(OatHeader)));

	off_t code_offset = oat_header.GetExecutableOffset();
	if (code_offset < file->Length()) {
	byte* code_address = map->GetAddress() + code_offset;
	size_t code_length = file->Length() - code_offset;
	if (mprotect(code_address, code_length, PROT_READ \| PROT_EXEC) != 0) {
	PLOG(ERROR) << "Failed to make oat code executable.";
	return false;
	}
	} else {
	// its possible to have no code if all the methods were abstract, native, etc
	DCHECK_EQ(code_offset, RoundUp(file->Length(), kPageSize));
	}

	const byte* oat = map->GetAddress();
	oat += sizeof(OatHeader);
	CHECK_LT(oat, map->GetLimit());
	for (size_t i = 0; i < oat_header.GetDexFileCount(); i++) {
	size_t dex_file_location_size = reinterpret_cast<const uint32_t>(oat);
	oat += sizeof(dex_file_location_size);
	CHECK_LT(oat, map->GetLimit());

	const char* dex_file_location_data = reinterpret_cast<const char*>(oat);
	oat += dex_file_location_size;
	CHECK_LT(oat, map->GetLimit());

	std::string dex_file_location(dex_file_location_data, dex_file_location_size);

	uint32_t dex_file_checksum = reinterpret_cast<const uint32_t>(oat);
	oat += sizeof(dex_file_checksum);
	CHECK_LT(oat, map->GetLimit());

	uint32_t classes_offset = reinterpret_cast<const uint32_t>(oat);
	CHECK_GT(classes_offset, 0U);
	CHECK_LT(classes_offset, static_cast<uint32_t>(file->Length()));
	oat += sizeof(classes_offset);
	CHECK_LT(oat, map->GetLimit());

	uint32_t* classes_pointer = reinterpret_cast<uint32_t*>(map->GetAddress() + classes_offset);

	oat_dex_files_[dex_file_location] = new OatDexFile(this,
	dex_file_location,
	dex_file_checksum,
	classes_pointer);
	}

	mem_map_.reset(map.release());
	return true;
	}

	const OatHeader& OatFile::GetOatHeader() const {
	return reinterpret_cast<const OatHeader>(GetBase());
	}

	const byte* OatFile::GetBase() const {
	CHECK(mem_map_->GetAddress() != NULL);
	return mem_map_->GetAddress();
	}

	const byte* OatFile::GetLimit() const {
	CHECK(mem_map_->GetLimit() != NULL);
	return mem_map_->GetLimit();
	}

	const OatFile::OatDexFile* OatFile::GetOatDexFile(const std::string& dex_file_location,
	bool warn_if_not_found) const {
	Table::const_iterator it = oat_dex_files_.find(dex_file_location);
	if (it == oat_dex_files_.end()) {
	if (warn_if_not_found) {
	LOG(WARNING) << "Failed to find OatDexFile for DexFile " << dex_file_location;
	}
	return NULL;
	}
	return it->second;
	}

	std::vector<const OatFile::OatDexFile*> OatFile::GetOatDexFiles() const {
	std::vector<const OatFile::OatDexFile*> result;
	for (Table::const_iterator it = oat_dex_files_.begin(); it != oat_dex_files_.end(); ++it) {
	result.push_back(it->second);
	}
	return result;
	}

	OatFile::OatDexFile::OatDexFile(const OatFile* oat_file,
	std::string dex_file_location,
	uint32_t dex_file_checksum,
	uint32_t* classes_pointer)
	: oat_file_(oat_file),
	dex_file_location_(dex_file_location),
	dex_file_checksum_(dex_file_checksum),
	classes_pointer_(classes_pointer) {}

	OatFile::OatDexFile::~OatDexFile() {}

	const OatFile::OatClass* OatFile::OatDexFile::GetOatClass(uint32_t class_def_index) const {
	uint32_t methods_offset = classes_pointer_[class_def_index];
	const byte* methods_pointer = oat_file_->GetBase() + methods_offset;
	CHECK_LT(methods_pointer, oat_file_->GetLimit());
	return new OatClass(oat_file_, reinterpret_cast<const OatMethodOffsets*>(methods_pointer));
	}

	OatFile::OatClass::OatClass(const OatFile* oat_file, const OatMethodOffsets* methods_pointer)
	: oat_file_(oat_file), methods_pointer_(methods_pointer) {}

	OatFile::OatClass::~OatClass() {}

	const OatFile::OatMethod OatFile::OatClass::GetOatMethod(uint32_t method_index) const {
	const OatMethodOffsets& oat_method_offsets = methods_pointer_[method_index];
	return OatMethod(
	oat_file_->GetBase(),
	oat_method_offsets.code_offset_,
	oat_method_offsets.frame_size_in_bytes_,
	oat_method_offsets.core_spill_mask_,
	oat_method_offsets.fp_spill_mask_,
	oat_method_offsets.mapping_table_offset_,
	oat_method_offsets.vmap_table_offset_,
	oat_method_offsets.invoke_stub_offset_);
	}

	OatFile::OatMethod::OatMethod(const byte* base,
	const uint32_t code_offset,
	const size_t frame_size_in_bytes,
	const uint32_t core_spill_mask,
	const uint32_t fp_spill_mask,
	const uint32_t mapping_table_offset,
	const uint32_t vmap_table_offset,
	const uint32_t invoke_stub_offset)
	: base_(base),
	code_offset_(code_offset),
	frame_size_in_bytes_(frame_size_in_bytes),
	core_spill_mask_(core_spill_mask),
	fp_spill_mask_(fp_spill_mask),
	mapping_table_offset_(mapping_table_offset),
	vmap_table_offset_(vmap_table_offset),
	invoke_stub_offset_(invoke_stub_offset) {

	#ifndef NDEBUG
	if (mapping_table_offset_ != 0) { // implies non-native, non-stub code
	if (vmap_table_offset_ == 0) {
	DCHECK_EQ(0U, static_cast<uint32_t>(__builtin_popcount(core_spill_mask_) + __builtin_popcount(fp_spill_mask_)));
	} else {
	const uint16_t* vmap_table_ = reinterpret_cast<const uint16_t*>(base_ + vmap_table_offset_);
	DCHECK_EQ(vmap_table_[0], static_cast<uint32_t>(__builtin_popcount(core_spill_mask_) + __builtin_popcount(fp_spill_mask_)));
	}
	} else {
	DCHECK(vmap_table_offset_ == 0);
	}
	#endif
	}

	OatFile::OatMethod::~OatMethod() {}

	void OatFile::OatMethod::LinkMethodPointers(Method* method) const {
	CHECK(method != NULL);
	method->SetCode(GetCode());
	method->SetFrameSizeInBytes(frame_size_in_bytes_);
	method->SetCoreSpillMask(core_spill_mask_);
	method->SetFpSpillMask(fp_spill_mask_);
	method->SetMappingTable(GetMappingTable());
	method->SetVmapTable(GetVmapTable());
	method->SetInvokeStub(GetInvokeStub());
	}

	void OatFile::OatMethod::LinkMethodOffsets(Method* method) const {
	CHECK(method != NULL);
	method->SetOatCodeOffset(GetCodeOffset());
	method->SetFrameSizeInBytes(GetFrameSizeInBytes());
	method->SetCoreSpillMask(GetCoreSpillMask());
	method->SetFpSpillMask(GetFpSpillMask());
	method->SetOatMappingTableOffset(GetMappingTableOffset());
	method->SetOatVmapTableOffset(GetVmapTableOffset());
	method->SetOatInvokeStubOffset(GetInvokeStubOffset());
	}

	} // namespace art