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1 /*
2  * Copyright (C) 2011 The Android Open Source Project
3  *
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
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
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.
15  */
16 
17 #include "oat_file.h"
18 
19 #include <dlfcn.h>
20 #include <sstream>
21 #include <string.h>
22 #include <unistd.h>
23 
24 #include "base/bit_vector.h"
25 #include "base/stl_util.h"
26 #include "base/unix_file/fd_file.h"
27 #include "elf_file.h"
28 #include "elf_utils.h"
29 #include "oat.h"
30 #include "mirror/art_method.h"
31 #include "mirror/art_method-inl.h"
32 #include "mirror/class.h"
33 #include "mirror/object-inl.h"
34 #include "os.h"
35 #include "runtime.h"
36 #include "utils.h"
37 #include "vmap_table.h"
38 
39 namespace art {
40 
CheckLocation(const std::string & location)41 void OatFile::CheckLocation(const std::string& location) {
42   CHECK(!location.empty());
43 }
44 
OpenWithElfFile(ElfFile * elf_file,const std::string & location,std::string * error_msg)45 OatFile* OatFile::OpenWithElfFile(ElfFile* elf_file,
46                                   const std::string& location,
47                                   std::string* error_msg) {
48   std::unique_ptr<OatFile> oat_file(new OatFile(location, false));
49   oat_file->elf_file_.reset(elf_file);
50   Elf32_Shdr* hdr = elf_file->FindSectionByName(".rodata");
51   oat_file->begin_ = elf_file->Begin() + hdr->sh_offset;
52   oat_file->end_ = elf_file->Begin() + hdr->sh_size + hdr->sh_offset;
53   return oat_file->Setup(error_msg) ? oat_file.release() : nullptr;
54 }
55 
OpenMemory(std::vector<uint8_t> & oat_contents,const std::string & location,std::string * error_msg)56 OatFile* OatFile::OpenMemory(std::vector<uint8_t>& oat_contents,
57                              const std::string& location,
58                              std::string* error_msg) {
59   CHECK(!oat_contents.empty()) << location;
60   CheckLocation(location);
61   std::unique_ptr<OatFile> oat_file(new OatFile(location, false));
62   oat_file->begin_ = &oat_contents[0];
63   oat_file->end_ = &oat_contents[oat_contents.size()];
64   return oat_file->Setup(error_msg) ? oat_file.release() : nullptr;
65 }
66 
Open(const std::string & filename,const std::string & location,byte * requested_base,bool executable,std::string * error_msg)67 OatFile* OatFile::Open(const std::string& filename,
68                        const std::string& location,
69                        byte* requested_base,
70                        bool executable,
71                        std::string* error_msg) {
72   CHECK(!filename.empty()) << location;
73   CheckLocation(filename);
74   std::unique_ptr<OatFile> ret;
75   if (kUsePortableCompiler && executable) {
76     // If we are using PORTABLE, use dlopen to deal with relocations.
77     //
78     // We use our own ELF loader for Quick to deal with legacy apps that
79     // open a generated dex file by name, remove the file, then open
80     // another generated dex file with the same name. http://b/10614658
81     ret.reset(OpenDlopen(filename, location, requested_base, error_msg));
82   } else {
83     // If we aren't trying to execute, we just use our own ElfFile loader for a couple reasons:
84     //
85     // On target, dlopen may fail when compiling due to selinux restrictions on installd.
86     //
87     // On host, dlopen is expected to fail when cross compiling, so fall back to OpenElfFile.
88     // This won't work for portable runtime execution because it doesn't process relocations.
89     std::unique_ptr<File> file(OS::OpenFileForReading(filename.c_str()));
90     if (file.get() == NULL) {
91       *error_msg = StringPrintf("Failed to open oat filename for reading: %s", strerror(errno));
92       return nullptr;
93     }
94     ret.reset(OpenElfFile(file.get(), location, requested_base, false, executable, error_msg));
95 
96     // It would be nice to unlink here. But we might have opened the file created by the
97     // ScopedLock, which we better not delete to avoid races. TODO: Investigate how to fix the API
98     // to allow removal when we know the ELF must be borked.
99   }
100   return ret.release();
101 }
102 
OpenWritable(File * file,const std::string & location,std::string * error_msg)103 OatFile* OatFile::OpenWritable(File* file, const std::string& location, std::string* error_msg) {
104   CheckLocation(location);
105   return OpenElfFile(file, location, NULL, true, false, error_msg);
106 }
107 
OpenReadable(File * file,const std::string & location,std::string * error_msg)108 OatFile* OatFile::OpenReadable(File* file, const std::string& location, std::string* error_msg) {
109   CheckLocation(location);
110   return OpenElfFile(file, location, NULL, false, false, error_msg);
111 }
112 
OpenDlopen(const std::string & elf_filename,const std::string & location,byte * requested_base,std::string * error_msg)113 OatFile* OatFile::OpenDlopen(const std::string& elf_filename,
114                              const std::string& location,
115                              byte* requested_base,
116                              std::string* error_msg) {
117   std::unique_ptr<OatFile> oat_file(new OatFile(location, true));
118   bool success = oat_file->Dlopen(elf_filename, requested_base, error_msg);
119   if (!success) {
120     return nullptr;
121   }
122   return oat_file.release();
123 }
124 
OpenElfFile(File * file,const std::string & location,byte * requested_base,bool writable,bool executable,std::string * error_msg)125 OatFile* OatFile::OpenElfFile(File* file,
126                               const std::string& location,
127                               byte* requested_base,
128                               bool writable,
129                               bool executable,
130                               std::string* error_msg) {
131   std::unique_ptr<OatFile> oat_file(new OatFile(location, executable));
132   bool success = oat_file->ElfFileOpen(file, requested_base, writable, executable, error_msg);
133   if (!success) {
134     CHECK(!error_msg->empty());
135     return nullptr;
136   }
137   return oat_file.release();
138 }
139 
OatFile(const std::string & location,bool is_executable)140 OatFile::OatFile(const std::string& location, bool is_executable)
141     : location_(location), begin_(NULL), end_(NULL), is_executable_(is_executable),
142       dlopen_handle_(NULL),
143       secondary_lookup_lock_("OatFile secondary lookup lock", kOatFileSecondaryLookupLock) {
144   CHECK(!location_.empty());
145 }
146 
~OatFile()147 OatFile::~OatFile() {
148   STLDeleteElements(&oat_dex_files_storage_);
149   if (dlopen_handle_ != NULL) {
150     dlclose(dlopen_handle_);
151   }
152 }
153 
Dlopen(const std::string & elf_filename,byte * requested_base,std::string * error_msg)154 bool OatFile::Dlopen(const std::string& elf_filename, byte* requested_base,
155                      std::string* error_msg) {
156   char* absolute_path = realpath(elf_filename.c_str(), NULL);
157   if (absolute_path == NULL) {
158     *error_msg = StringPrintf("Failed to find absolute path for '%s'", elf_filename.c_str());
159     return false;
160   }
161   dlopen_handle_ = dlopen(absolute_path, RTLD_NOW);
162   free(absolute_path);
163   if (dlopen_handle_ == NULL) {
164     *error_msg = StringPrintf("Failed to dlopen '%s': %s", elf_filename.c_str(), dlerror());
165     return false;
166   }
167   begin_ = reinterpret_cast<byte*>(dlsym(dlopen_handle_, "oatdata"));
168   if (begin_ == NULL) {
169     *error_msg = StringPrintf("Failed to find oatdata symbol in '%s': %s", elf_filename.c_str(),
170                               dlerror());
171     return false;
172   }
173   if (requested_base != NULL && begin_ != requested_base) {
174     *error_msg = StringPrintf("Failed to find oatdata symbol at expected address: "
175                               "oatdata=%p != expected=%p /proc/self/maps:\n",
176                               begin_, requested_base);
177     ReadFileToString("/proc/self/maps", error_msg);
178     return false;
179   }
180   end_ = reinterpret_cast<byte*>(dlsym(dlopen_handle_, "oatlastword"));
181   if (end_ == NULL) {
182     *error_msg = StringPrintf("Failed to find oatlastword symbol in '%s': %s", elf_filename.c_str(),
183                               dlerror());
184     return false;
185   }
186   // Readjust to be non-inclusive upper bound.
187   end_ += sizeof(uint32_t);
188   return Setup(error_msg);
189 }
190 
ElfFileOpen(File * file,byte * requested_base,bool writable,bool executable,std::string * error_msg)191 bool OatFile::ElfFileOpen(File* file, byte* requested_base, bool writable, bool executable,
192                           std::string* error_msg) {
193   elf_file_.reset(ElfFile::Open(file, writable, true, error_msg));
194   if (elf_file_.get() == nullptr) {
195     DCHECK(!error_msg->empty());
196     return false;
197   }
198   bool loaded = elf_file_->Load(executable, error_msg);
199   if (!loaded) {
200     DCHECK(!error_msg->empty());
201     return false;
202   }
203   begin_ = elf_file_->FindDynamicSymbolAddress("oatdata");
204   if (begin_ == NULL) {
205     *error_msg = StringPrintf("Failed to find oatdata symbol in '%s'", file->GetPath().c_str());
206     return false;
207   }
208   if (requested_base != NULL && begin_ != requested_base) {
209     *error_msg = StringPrintf("Failed to find oatdata symbol at expected address: "
210                               "oatdata=%p != expected=%p /proc/self/maps:\n",
211                               begin_, requested_base);
212     ReadFileToString("/proc/self/maps", error_msg);
213     return false;
214   }
215   end_ = elf_file_->FindDynamicSymbolAddress("oatlastword");
216   if (end_ == NULL) {
217     *error_msg = StringPrintf("Failed to find oatlastword symbol in '%s'", file->GetPath().c_str());
218     return false;
219   }
220   // Readjust to be non-inclusive upper bound.
221   end_ += sizeof(uint32_t);
222   return Setup(error_msg);
223 }
224 
Setup(std::string * error_msg)225 bool OatFile::Setup(std::string* error_msg) {
226   if (!GetOatHeader().IsValid()) {
227     *error_msg = StringPrintf("Invalid oat magic for '%s'", GetLocation().c_str());
228     return false;
229   }
230   const byte* oat = Begin();
231   oat += sizeof(OatHeader);
232   if (oat > End()) {
233     *error_msg = StringPrintf("In oat file '%s' found truncated OatHeader", GetLocation().c_str());
234     return false;
235   }
236 
237   oat += GetOatHeader().GetKeyValueStoreSize();
238   if (oat > End()) {
239     *error_msg = StringPrintf("In oat file '%s' found truncated variable-size data: "
240                               "%p + %zd + %ud <= %p", GetLocation().c_str(),
241                               Begin(), sizeof(OatHeader), GetOatHeader().GetKeyValueStoreSize(),
242                               End());
243     return false;
244   }
245 
246   uint32_t dex_file_count = GetOatHeader().GetDexFileCount();
247   oat_dex_files_storage_.reserve(dex_file_count);
248   for (size_t i = 0; i < dex_file_count; i++) {
249     uint32_t dex_file_location_size = *reinterpret_cast<const uint32_t*>(oat);
250     if (UNLIKELY(dex_file_location_size == 0U)) {
251       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd with empty location name",
252                                 GetLocation().c_str(), i);
253       return false;
254     }
255     oat += sizeof(dex_file_location_size);
256     if (UNLIKELY(oat > End())) {
257       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd truncated after dex file "
258                                 "location size", GetLocation().c_str(), i);
259       return false;
260     }
261 
262     const char* dex_file_location_data = reinterpret_cast<const char*>(oat);
263     oat += dex_file_location_size;
264     if (UNLIKELY(oat > End())) {
265       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd with truncated dex file "
266                                 "location", GetLocation().c_str(), i);
267       return false;
268     }
269 
270     std::string dex_file_location(dex_file_location_data, dex_file_location_size);
271 
272     uint32_t dex_file_checksum = *reinterpret_cast<const uint32_t*>(oat);
273     oat += sizeof(dex_file_checksum);
274     if (UNLIKELY(oat > End())) {
275       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' truncated after "
276                                 "dex file checksum", GetLocation().c_str(), i,
277                                 dex_file_location.c_str());
278       return false;
279     }
280 
281     uint32_t dex_file_offset = *reinterpret_cast<const uint32_t*>(oat);
282     if (UNLIKELY(dex_file_offset == 0U)) {
283       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' with zero dex "
284                                 "file offset", GetLocation().c_str(), i, dex_file_location.c_str());
285       return false;
286     }
287     if (UNLIKELY(dex_file_offset > Size())) {
288       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' with dex file "
289                                 "offset %ud > %zd", GetLocation().c_str(), i,
290                                 dex_file_location.c_str(), dex_file_offset, Size());
291       return false;
292     }
293     oat += sizeof(dex_file_offset);
294     if (UNLIKELY(oat > End())) {
295       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' truncated "
296                                 " after dex file offsets", GetLocation().c_str(), i,
297                                 dex_file_location.c_str());
298       return false;
299     }
300 
301     const uint8_t* dex_file_pointer = Begin() + dex_file_offset;
302     if (UNLIKELY(!DexFile::IsMagicValid(dex_file_pointer))) {
303       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' with invalid "
304                                 " dex file magic '%s'", GetLocation().c_str(), i,
305                                 dex_file_location.c_str(), dex_file_pointer);
306       return false;
307     }
308     if (UNLIKELY(!DexFile::IsVersionValid(dex_file_pointer))) {
309       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' with invalid "
310                                 " dex file version '%s'", GetLocation().c_str(), i,
311                                 dex_file_location.c_str(), dex_file_pointer);
312       return false;
313     }
314     const DexFile::Header* header = reinterpret_cast<const DexFile::Header*>(dex_file_pointer);
315     const uint32_t* methods_offsets_pointer = reinterpret_cast<const uint32_t*>(oat);
316 
317     oat += (sizeof(*methods_offsets_pointer) * header->class_defs_size_);
318     if (UNLIKELY(oat > End())) {
319       *error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' with truncated "
320                                 " method offsets", GetLocation().c_str(), i,
321                                 dex_file_location.c_str());
322       return false;
323     }
324 
325     std::string canonical_location = DexFile::GetDexCanonicalLocation(dex_file_location.c_str());
326 
327     // Create the OatDexFile and add it to the owning container.
328     OatDexFile* oat_dex_file = new OatDexFile(this,
329                                               dex_file_location,
330                                               canonical_location,
331                                               dex_file_checksum,
332                                               dex_file_pointer,
333                                               methods_offsets_pointer);
334     oat_dex_files_storage_.push_back(oat_dex_file);
335 
336     // Add the location and canonical location (if different) to the oat_dex_files_ table.
337     StringPiece key(oat_dex_file->GetDexFileLocation());
338     oat_dex_files_.Put(key, oat_dex_file);
339     if (canonical_location != dex_file_location) {
340       StringPiece canonical_key(oat_dex_file->GetCanonicalDexFileLocation());
341       oat_dex_files_.Put(canonical_key, oat_dex_file);
342     }
343   }
344   return true;
345 }
346 
GetOatHeader() const347 const OatHeader& OatFile::GetOatHeader() const {
348   return *reinterpret_cast<const OatHeader*>(Begin());
349 }
350 
Begin() const351 const byte* OatFile::Begin() const {
352   CHECK(begin_ != NULL);
353   return begin_;
354 }
355 
End() const356 const byte* OatFile::End() const {
357   CHECK(end_ != NULL);
358   return end_;
359 }
360 
GetOatDexFile(const char * dex_location,const uint32_t * dex_location_checksum,bool warn_if_not_found) const361 const OatFile::OatDexFile* OatFile::GetOatDexFile(const char* dex_location,
362                                                   const uint32_t* dex_location_checksum,
363                                                   bool warn_if_not_found) const {
364   // NOTE: We assume here that the canonical location for a given dex_location never
365   // changes. If it does (i.e. some symlink used by the filename changes) we may return
366   // an incorrect OatDexFile. As long as we have a checksum to check, we shall return
367   // an identical file or fail; otherwise we may see some unpredictable failures.
368 
369   // TODO: Additional analysis of usage patterns to see if this can be simplified
370   // without any performance loss, for example by not doing the first lock-free lookup.
371 
372   const OatFile::OatDexFile* oat_dex_file = nullptr;
373   StringPiece key(dex_location);
374   // Try to find the key cheaply in the oat_dex_files_ map which holds dex locations
375   // directly mentioned in the oat file and doesn't require locking.
376   auto primary_it = oat_dex_files_.find(key);
377   if (primary_it != oat_dex_files_.end()) {
378     oat_dex_file = primary_it->second;
379     DCHECK(oat_dex_file != nullptr);
380   } else {
381     // This dex_location is not one of the dex locations directly mentioned in the
382     // oat file. The correct lookup is via the canonical location but first see in
383     // the secondary_oat_dex_files_ whether we've looked up this location before.
384     MutexLock mu(Thread::Current(), secondary_lookup_lock_);
385     auto secondary_lb = secondary_oat_dex_files_.lower_bound(key);
386     if (secondary_lb != secondary_oat_dex_files_.end() && key == secondary_lb->first) {
387       oat_dex_file = secondary_lb->second;  // May be nullptr.
388     } else {
389       // We haven't seen this dex_location before, we must check the canonical location.
390       std::string dex_canonical_location = DexFile::GetDexCanonicalLocation(dex_location);
391       if (dex_canonical_location != dex_location) {
392         StringPiece canonical_key(dex_canonical_location);
393         auto canonical_it = oat_dex_files_.find(canonical_key);
394         if (canonical_it != oat_dex_files_.end()) {
395           oat_dex_file = canonical_it->second;
396         }  // else keep nullptr.
397       }  // else keep nullptr.
398 
399       // Copy the key to the string_cache_ and store the result in secondary map.
400       string_cache_.emplace_back(key.data(), key.length());
401       StringPiece key_copy(string_cache_.back());
402       secondary_oat_dex_files_.PutBefore(secondary_lb, key_copy, oat_dex_file);
403     }
404   }
405   if (oat_dex_file != nullptr &&
406       (dex_location_checksum == nullptr ||
407        oat_dex_file->GetDexFileLocationChecksum() == *dex_location_checksum)) {
408     return oat_dex_file;
409   }
410 
411   if (warn_if_not_found) {
412     std::string dex_canonical_location = DexFile::GetDexCanonicalLocation(dex_location);
413     std::string checksum("<unspecified>");
414     if (dex_location_checksum != NULL) {
415       checksum = StringPrintf("0x%08x", *dex_location_checksum);
416     }
417     LOG(WARNING) << "Failed to find OatDexFile for DexFile " << dex_location
418                  << " ( canonical path " << dex_canonical_location << ")"
419                  << " with checksum " << checksum << " in OatFile " << GetLocation();
420     if (kIsDebugBuild) {
421       for (const OatDexFile* odf : oat_dex_files_storage_) {
422         LOG(WARNING) << "OatFile " << GetLocation()
423                      << " contains OatDexFile " << odf->GetDexFileLocation()
424                      << " (canonical path " << odf->GetCanonicalDexFileLocation() << ")"
425                      << " with checksum 0x" << std::hex << odf->GetDexFileLocationChecksum();
426       }
427     }
428   }
429 
430   return NULL;
431 }
432 
OatDexFile(const OatFile * oat_file,const std::string & dex_file_location,const std::string & canonical_dex_file_location,uint32_t dex_file_location_checksum,const byte * dex_file_pointer,const uint32_t * oat_class_offsets_pointer)433 OatFile::OatDexFile::OatDexFile(const OatFile* oat_file,
434                                 const std::string& dex_file_location,
435                                 const std::string& canonical_dex_file_location,
436                                 uint32_t dex_file_location_checksum,
437                                 const byte* dex_file_pointer,
438                                 const uint32_t* oat_class_offsets_pointer)
439     : oat_file_(oat_file),
440       dex_file_location_(dex_file_location),
441       canonical_dex_file_location_(canonical_dex_file_location),
442       dex_file_location_checksum_(dex_file_location_checksum),
443       dex_file_pointer_(dex_file_pointer),
444       oat_class_offsets_pointer_(oat_class_offsets_pointer) {}
445 
~OatDexFile()446 OatFile::OatDexFile::~OatDexFile() {}
447 
FileSize() const448 size_t OatFile::OatDexFile::FileSize() const {
449   return reinterpret_cast<const DexFile::Header*>(dex_file_pointer_)->file_size_;
450 }
451 
OpenDexFile(std::string * error_msg) const452 const DexFile* OatFile::OatDexFile::OpenDexFile(std::string* error_msg) const {
453   return DexFile::Open(dex_file_pointer_, FileSize(), dex_file_location_,
454                        dex_file_location_checksum_, error_msg);
455 }
456 
GetOatClassOffset(uint16_t class_def_index) const457 uint32_t OatFile::OatDexFile::GetOatClassOffset(uint16_t class_def_index) const {
458   return oat_class_offsets_pointer_[class_def_index];
459 }
460 
GetOatClass(uint16_t class_def_index) const461 OatFile::OatClass OatFile::OatDexFile::GetOatClass(uint16_t class_def_index) const {
462   uint32_t oat_class_offset = GetOatClassOffset(class_def_index);
463 
464   const byte* oat_class_pointer = oat_file_->Begin() + oat_class_offset;
465   CHECK_LT(oat_class_pointer, oat_file_->End()) << oat_file_->GetLocation();
466 
467   const byte* status_pointer = oat_class_pointer;
468   CHECK_LT(status_pointer, oat_file_->End()) << oat_file_->GetLocation();
469   mirror::Class::Status status =
470       static_cast<mirror::Class::Status>(*reinterpret_cast<const int16_t*>(status_pointer));
471   CHECK_LT(status, mirror::Class::kStatusMax);
472 
473   const byte* type_pointer = status_pointer + sizeof(uint16_t);
474   CHECK_LT(type_pointer, oat_file_->End()) << oat_file_->GetLocation();
475   OatClassType type = static_cast<OatClassType>(*reinterpret_cast<const uint16_t*>(type_pointer));
476   CHECK_LT(type, kOatClassMax);
477 
478   const byte* after_type_pointer = type_pointer + sizeof(int16_t);
479   CHECK_LE(after_type_pointer, oat_file_->End()) << oat_file_->GetLocation();
480 
481   uint32_t bitmap_size = 0;
482   const byte* bitmap_pointer = nullptr;
483   const byte* methods_pointer = nullptr;
484   if (type == kOatClassSomeCompiled) {
485     bitmap_size = static_cast<uint32_t>(*reinterpret_cast<const uint32_t*>(after_type_pointer));
486     bitmap_pointer = after_type_pointer + sizeof(bitmap_size);
487     CHECK_LE(bitmap_pointer, oat_file_->End()) << oat_file_->GetLocation();
488     methods_pointer = bitmap_pointer + bitmap_size;
489   } else {
490     methods_pointer = after_type_pointer;
491   }
492   CHECK_LE(methods_pointer, oat_file_->End()) << oat_file_->GetLocation();
493 
494   return OatClass(oat_file_,
495                   status,
496                   type,
497                   bitmap_size,
498                   reinterpret_cast<const uint32_t*>(bitmap_pointer),
499                   reinterpret_cast<const OatMethodOffsets*>(methods_pointer));
500 }
501 
OatClass(const OatFile * oat_file,mirror::Class::Status status,OatClassType type,uint32_t bitmap_size,const uint32_t * bitmap_pointer,const OatMethodOffsets * methods_pointer)502 OatFile::OatClass::OatClass(const OatFile* oat_file,
503                             mirror::Class::Status status,
504                             OatClassType type,
505                             uint32_t bitmap_size,
506                             const uint32_t* bitmap_pointer,
507                             const OatMethodOffsets* methods_pointer)
508     : oat_file_(oat_file), status_(status), type_(type),
509       bitmap_(bitmap_pointer), methods_pointer_(methods_pointer) {
510     CHECK(methods_pointer != nullptr);
511     switch (type_) {
512       case kOatClassAllCompiled: {
513         CHECK_EQ(0U, bitmap_size);
514         CHECK(bitmap_pointer == nullptr);
515         break;
516       }
517       case kOatClassSomeCompiled: {
518         CHECK_NE(0U, bitmap_size);
519         CHECK(bitmap_pointer != nullptr);
520         break;
521       }
522       case kOatClassNoneCompiled: {
523         CHECK_EQ(0U, bitmap_size);
524         CHECK(bitmap_pointer == nullptr);
525         methods_pointer_ = nullptr;
526         break;
527       }
528       case kOatClassMax: {
529         LOG(FATAL) << "Invalid OatClassType " << type_;
530         break;
531       }
532     }
533 }
534 
GetOatMethodOffsetsOffset(uint32_t method_index) const535 uint32_t OatFile::OatClass::GetOatMethodOffsetsOffset(uint32_t method_index) const {
536   const OatMethodOffsets* oat_method_offsets = GetOatMethodOffsets(method_index);
537   if (oat_method_offsets == nullptr) {
538     return 0u;
539   }
540   return reinterpret_cast<const uint8_t*>(oat_method_offsets) - oat_file_->Begin();
541 }
542 
GetOatMethodOffsets(uint32_t method_index) const543 const OatMethodOffsets* OatFile::OatClass::GetOatMethodOffsets(uint32_t method_index) const {
544   // NOTE: We don't keep the number of methods and cannot do a bounds check for method_index.
545   if (methods_pointer_ == nullptr) {
546     CHECK_EQ(kOatClassNoneCompiled, type_);
547     return nullptr;
548   }
549   size_t methods_pointer_index;
550   if (bitmap_ == nullptr) {
551     CHECK_EQ(kOatClassAllCompiled, type_);
552     methods_pointer_index = method_index;
553   } else {
554     CHECK_EQ(kOatClassSomeCompiled, type_);
555     if (!BitVector::IsBitSet(bitmap_, method_index)) {
556       return nullptr;
557     }
558     size_t num_set_bits = BitVector::NumSetBits(bitmap_, method_index);
559     methods_pointer_index = num_set_bits;
560   }
561   const OatMethodOffsets& oat_method_offsets = methods_pointer_[methods_pointer_index];
562   return &oat_method_offsets;
563 }
564 
GetOatMethod(uint32_t method_index) const565 const OatFile::OatMethod OatFile::OatClass::GetOatMethod(uint32_t method_index) const {
566   const OatMethodOffsets* oat_method_offsets = GetOatMethodOffsets(method_index);
567   if (oat_method_offsets == nullptr) {
568     return OatMethod(nullptr, 0, 0);
569   }
570   if (oat_file_->IsExecutable() ||
571       Runtime::Current() == nullptr ||        // This case applies for oatdump.
572       Runtime::Current()->IsCompiler()) {
573     return OatMethod(
574         oat_file_->Begin(),
575         oat_method_offsets->code_offset_,
576         oat_method_offsets->gc_map_offset_);
577   } else {
578     // We aren't allowed to use the compiled code. We just force it down the interpreted version.
579     return OatMethod(oat_file_->Begin(), 0, 0);
580   }
581 }
582 
OatMethod(const byte * base,const uint32_t code_offset,const uint32_t gc_map_offset)583 OatFile::OatMethod::OatMethod(const byte* base,
584                               const uint32_t code_offset,
585                               const uint32_t gc_map_offset)
586   : begin_(base),
587     code_offset_(code_offset),
588     native_gc_map_offset_(gc_map_offset) {
589 }
590 
~OatMethod()591 OatFile::OatMethod::~OatMethod() {}
592 
LinkMethod(mirror::ArtMethod * method) const593 void OatFile::OatMethod::LinkMethod(mirror::ArtMethod* method) const {
594   CHECK(method != NULL);
595 #if defined(ART_USE_PORTABLE_COMPILER)
596   method->SetEntryPointFromPortableCompiledCode(GetPortableCode());
597 #endif
598   method->SetEntryPointFromQuickCompiledCode(GetQuickCode());
599   method->SetNativeGcMap(GetNativeGcMap());
600 }
601 
602 }  // namespace art
603