1 //===-- ObjectContainerBSDArchive.cpp ---------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "ObjectContainerBSDArchive.h"
12 #if defined(_WIN32) || defined(__ANDROID__)
13 // Defines from ar, missing on Windows
14 #define ARMAG "!<arch>\n"
18 typedef struct ar_hdr {
21 char ar_uid[6], ar_gid[6];
30 #include "lldb/Core/Module.h"
31 #include "lldb/Core/ModuleSpec.h"
32 #include "lldb/Core/PluginManager.h"
33 #include "lldb/Host/FileSystem.h"
34 #include "lldb/Symbol/ObjectFile.h"
35 #include "lldb/Utility/ArchSpec.h"
36 #include "lldb/Utility/DataBufferLLVM.h"
37 #include "lldb/Utility/Stream.h"
38 #include "lldb/Utility/Timer.h"
40 #include "llvm/Support/MemoryBuffer.h"
43 using namespace lldb_private;
45 ObjectContainerBSDArchive::Object::Object()
46 : ar_name(), ar_date(0), ar_uid(0), ar_gid(0), ar_mode(0), ar_size(0),
47 ar_file_offset(0), ar_file_size(0) {}
49 void ObjectContainerBSDArchive::Object::Clear() {
61 ObjectContainerBSDArchive::Object::Extract(const DataExtractor &data,
62 lldb::offset_t offset) {
63 size_t ar_name_len = 0;
69 // The common format is as follows.
71 // Offset Length Name Format
72 // 0 16 File name ASCII right padded with spaces (no spaces
73 // allowed in file name)
74 // 16 12 File mod Decimal as cstring right padded with
76 // 28 6 Owner ID Decimal as cstring right padded with
78 // 34 6 Group ID Decimal as cstring right padded with
80 // 40 8 File mode Octal as cstring right padded with
82 // 48 10 File byte size Decimal as cstring right padded with
84 // 58 2 File magic 0x60 0x0A
86 // Make sure there is enough data for the file header and bail if not
87 if (!data.ValidOffsetForDataOfSize(offset, 60))
88 return LLDB_INVALID_OFFSET;
90 str.assign((const char *)data.GetData(&offset, 16), 16);
91 if (str.find("#1/") == 0) {
92 // If the name is longer than 16 bytes, or contains an embedded space then
93 // it will use this format where the length of the name is here and the
94 // name characters are after this header.
95 ar_name_len = strtoul(str.c_str() + 3, &err, 10);
97 // Strip off any trailing spaces.
98 const size_t last_pos = str.find_last_not_of(' ');
99 if (last_pos != std::string::npos) {
100 if (last_pos + 1 < 16)
101 str.erase(last_pos + 1);
103 ar_name.SetCString(str.c_str());
106 str.assign((const char *)data.GetData(&offset, 12), 12);
107 ar_date = strtoul(str.c_str(), &err, 10);
109 str.assign((const char *)data.GetData(&offset, 6), 6);
110 ar_uid = strtoul(str.c_str(), &err, 10);
112 str.assign((const char *)data.GetData(&offset, 6), 6);
113 ar_gid = strtoul(str.c_str(), &err, 10);
115 str.assign((const char *)data.GetData(&offset, 8), 8);
116 ar_mode = strtoul(str.c_str(), &err, 8);
118 str.assign((const char *)data.GetData(&offset, 10), 10);
119 ar_size = strtoul(str.c_str(), &err, 10);
121 str.assign((const char *)data.GetData(&offset, 2), 2);
123 if (ar_name_len > 0) {
124 const void *ar_name_ptr = data.GetData(&offset, ar_name_len);
125 // Make sure there was enough data for the string value and bail if not
126 if (ar_name_ptr == NULL)
127 return LLDB_INVALID_OFFSET;
128 str.assign((const char *)ar_name_ptr, ar_name_len);
129 ar_name.SetCString(str.c_str());
131 ar_file_offset = offset;
132 ar_file_size = ar_size - ar_name_len;
135 return LLDB_INVALID_OFFSET;
138 ObjectContainerBSDArchive::Archive::Archive(const lldb_private::ArchSpec &arch,
139 const llvm::sys::TimePoint<> &time,
140 lldb::offset_t file_offset,
141 lldb_private::DataExtractor &data)
142 : m_arch(arch), m_time(time), m_file_offset(file_offset), m_objects(),
145 ObjectContainerBSDArchive::Archive::~Archive() {}
147 size_t ObjectContainerBSDArchive::Archive::ParseObjects() {
148 DataExtractor &data = m_data;
150 lldb::offset_t offset = 0;
151 str.assign((const char *)data.GetData(&offset, SARMAG), SARMAG);
155 offset = obj.Extract(data, offset);
156 if (offset == LLDB_INVALID_OFFSET)
158 size_t obj_idx = m_objects.size();
159 m_objects.push_back(obj);
160 // Insert all of the C strings out of order for now...
161 m_object_name_to_index_map.Append(obj.ar_name, obj_idx);
162 offset += obj.ar_file_size;
164 } while (data.ValidOffset(offset));
166 // Now sort all of the object name pointers
167 m_object_name_to_index_map.Sort();
169 return m_objects.size();
172 ObjectContainerBSDArchive::Object *
173 ObjectContainerBSDArchive::Archive::FindObject(
174 const ConstString &object_name,
175 const llvm::sys::TimePoint<> &object_mod_time) {
176 const ObjectNameToIndexMap::Entry *match =
177 m_object_name_to_index_map.FindFirstValueForName(object_name);
179 if (object_mod_time != llvm::sys::TimePoint<>()) {
180 const uint64_t object_date = llvm::sys::toTimeT(object_mod_time);
181 if (m_objects[match->value].ar_date == object_date)
182 return &m_objects[match->value];
183 const ObjectNameToIndexMap::Entry *next_match =
184 m_object_name_to_index_map.FindNextValueForName(match);
186 if (m_objects[next_match->value].ar_date == object_date)
187 return &m_objects[next_match->value];
189 m_object_name_to_index_map.FindNextValueForName(next_match);
192 return &m_objects[match->value];
198 ObjectContainerBSDArchive::Archive::shared_ptr
199 ObjectContainerBSDArchive::Archive::FindCachedArchive(
200 const FileSpec &file, const ArchSpec &arch,
201 const llvm::sys::TimePoint<> &time, lldb::offset_t file_offset) {
202 std::lock_guard<std::recursive_mutex> guard(Archive::GetArchiveCacheMutex());
203 shared_ptr archive_sp;
204 Archive::Map &archive_map = Archive::GetArchiveCache();
205 Archive::Map::iterator pos = archive_map.find(file);
206 // Don't cache a value for "archive_map.end()" below since we might delete an
208 while (pos != archive_map.end() && pos->first == file) {
210 if (arch.IsValid() &&
211 pos->second->GetArchitecture().IsCompatibleMatch(arch) == false)
213 else if (file_offset != LLDB_INVALID_OFFSET &&
214 pos->second->GetFileOffset() != file_offset)
217 if (pos->second->GetModificationTime() == time) {
220 // We have a file at the same path with the same architecture whose
221 // modification time doesn't match. It doesn't make sense for us to
222 // continue to use this BSD archive since we cache only the object info
223 // which consists of file time info and also the file offset and file
224 // size of any contained objects. Since this information is now out of
225 // date, we won't get the correct information if we go and extract the
226 // file data, so we should remove the old and outdated entry.
227 archive_map.erase(pos);
228 pos = archive_map.find(file);
229 continue; // Continue to next iteration so we don't increment pos
238 ObjectContainerBSDArchive::Archive::shared_ptr
239 ObjectContainerBSDArchive::Archive::ParseAndCacheArchiveForFile(
240 const FileSpec &file, const ArchSpec &arch,
241 const llvm::sys::TimePoint<> &time, lldb::offset_t file_offset,
242 DataExtractor &data) {
243 shared_ptr archive_sp(new Archive(arch, time, file_offset, data));
245 const size_t num_objects = archive_sp->ParseObjects();
246 if (num_objects > 0) {
247 std::lock_guard<std::recursive_mutex> guard(
248 Archive::GetArchiveCacheMutex());
249 Archive::GetArchiveCache().insert(std::make_pair(file, archive_sp));
257 ObjectContainerBSDArchive::Archive::Map &
258 ObjectContainerBSDArchive::Archive::GetArchiveCache() {
259 static Archive::Map g_archive_map;
260 return g_archive_map;
263 std::recursive_mutex &
264 ObjectContainerBSDArchive::Archive::GetArchiveCacheMutex() {
265 static std::recursive_mutex g_archive_map_mutex;
266 return g_archive_map_mutex;
269 void ObjectContainerBSDArchive::Initialize() {
270 PluginManager::RegisterPlugin(GetPluginNameStatic(),
271 GetPluginDescriptionStatic(), CreateInstance,
272 GetModuleSpecifications);
275 void ObjectContainerBSDArchive::Terminate() {
276 PluginManager::UnregisterPlugin(CreateInstance);
279 lldb_private::ConstString ObjectContainerBSDArchive::GetPluginNameStatic() {
280 static ConstString g_name("bsd-archive");
284 const char *ObjectContainerBSDArchive::GetPluginDescriptionStatic() {
285 return "BSD Archive object container reader.";
288 ObjectContainer *ObjectContainerBSDArchive::CreateInstance(
289 const lldb::ModuleSP &module_sp, DataBufferSP &data_sp,
290 lldb::offset_t data_offset, const FileSpec *file,
291 lldb::offset_t file_offset, lldb::offset_t length) {
292 ConstString object_name(module_sp->GetObjectName());
297 // We have data, which means this is the first 512 bytes of the file Check
298 // to see if the magic bytes match and if they do, read the entire table of
299 // contents for the archive and cache it
301 data.SetData(data_sp, data_offset, length);
302 if (file && data_sp && ObjectContainerBSDArchive::MagicBytesMatch(data)) {
303 static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
306 "ObjectContainerBSDArchive::CreateInstance (module = %s, file = "
307 "%p, file_offset = 0x%8.8" PRIx64 ", file_size = 0x%8.8" PRIx64 ")",
308 module_sp->GetFileSpec().GetPath().c_str(),
309 static_cast<const void *>(file), static_cast<uint64_t>(file_offset),
310 static_cast<uint64_t>(length));
312 // Map the entire .a file to be sure that we don't lose any data if the
313 // file gets updated by a new build while this .a file is being used for
315 DataBufferSP archive_data_sp =
316 DataBufferLLVM::CreateSliceFromPath(file->GetPath(), length, file_offset);
317 if (!archive_data_sp)
320 lldb::offset_t archive_data_offset = 0;
322 Archive::shared_ptr archive_sp(Archive::FindCachedArchive(
323 *file, module_sp->GetArchitecture(), module_sp->GetModificationTime(),
325 std::unique_ptr<ObjectContainerBSDArchive> container_ap(
326 new ObjectContainerBSDArchive(module_sp, archive_data_sp,
327 archive_data_offset, file, file_offset,
330 if (container_ap.get()) {
332 // We already have this archive in our cache, use it
333 container_ap->SetArchive(archive_sp);
334 return container_ap.release();
335 } else if (container_ap->ParseHeader())
336 return container_ap.release();
340 // No data, just check for a cached archive
341 Archive::shared_ptr archive_sp(Archive::FindCachedArchive(
342 *file, module_sp->GetArchitecture(), module_sp->GetModificationTime(),
345 std::unique_ptr<ObjectContainerBSDArchive> container_ap(
346 new ObjectContainerBSDArchive(module_sp, data_sp, data_offset, file,
347 file_offset, length));
349 if (container_ap.get()) {
350 // We already have this archive in our cache, use it
351 container_ap->SetArchive(archive_sp);
352 return container_ap.release();
359 bool ObjectContainerBSDArchive::MagicBytesMatch(const DataExtractor &data) {
361 const char *armag = (const char *)data.PeekData(offset, sizeof(ar_hdr));
362 if (armag && ::strncmp(armag, ARMAG, SARMAG) == 0) {
363 armag += offsetof(struct ar_hdr, ar_fmag) + SARMAG;
364 if (strncmp(armag, ARFMAG, 2) == 0)
370 ObjectContainerBSDArchive::ObjectContainerBSDArchive(
371 const lldb::ModuleSP &module_sp, DataBufferSP &data_sp,
372 lldb::offset_t data_offset, const lldb_private::FileSpec *file,
373 lldb::offset_t file_offset, lldb::offset_t size)
374 : ObjectContainer(module_sp, file, file_offset, size, data_sp, data_offset),
376 void ObjectContainerBSDArchive::SetArchive(Archive::shared_ptr &archive_sp) {
377 m_archive_sp = archive_sp;
380 ObjectContainerBSDArchive::~ObjectContainerBSDArchive() {}
382 bool ObjectContainerBSDArchive::ParseHeader() {
383 if (m_archive_sp.get() == NULL) {
384 if (m_data.GetByteSize() > 0) {
385 ModuleSP module_sp(GetModule());
387 m_archive_sp = Archive::ParseAndCacheArchiveForFile(
388 m_file, module_sp->GetArchitecture(),
389 module_sp->GetModificationTime(), m_offset, m_data);
391 // Clear the m_data that contains the entire archive data and let our
392 // m_archive_sp hold onto the data.
396 return m_archive_sp.get() != NULL;
399 void ObjectContainerBSDArchive::Dump(Stream *s) const {
400 s->Printf("%p: ", static_cast<const void *>(this));
402 const size_t num_archs = GetNumArchitectures();
403 const size_t num_objects = GetNumObjects();
404 s->Printf("ObjectContainerBSDArchive, num_archs = %" PRIu64
405 ", num_objects = %" PRIu64 "",
406 (uint64_t)num_archs, (uint64_t)num_objects);
410 for (i = 0; i < num_archs; i++) {
412 GetArchitectureAtIndex(i, arch);
413 s->Printf("arch[%u] = %s\n", i, arch.GetArchitectureName());
415 for (i = 0; i < num_objects; i++) {
417 s->Printf("object[%u] = %s\n", i, GetObjectNameAtIndex(i));
423 ObjectFileSP ObjectContainerBSDArchive::GetObjectFile(const FileSpec *file) {
424 ModuleSP module_sp(GetModule());
426 if (module_sp->GetObjectName() && m_archive_sp) {
427 Object *object = m_archive_sp->FindObject(
428 module_sp->GetObjectName(), module_sp->GetObjectModificationTime());
430 lldb::offset_t data_offset = object->ar_file_offset;
431 return ObjectFile::FindPlugin(
432 module_sp, file, m_offset + object->ar_file_offset,
433 object->ar_file_size, m_archive_sp->GetData().GetSharedDataBuffer(),
438 return ObjectFileSP();
441 //------------------------------------------------------------------
442 // PluginInterface protocol
443 //------------------------------------------------------------------
444 lldb_private::ConstString ObjectContainerBSDArchive::GetPluginName() {
445 return GetPluginNameStatic();
448 uint32_t ObjectContainerBSDArchive::GetPluginVersion() { return 1; }
450 size_t ObjectContainerBSDArchive::GetModuleSpecifications(
451 const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
452 lldb::offset_t data_offset, lldb::offset_t file_offset,
453 lldb::offset_t file_size, lldb_private::ModuleSpecList &specs) {
455 // We have data, which means this is the first 512 bytes of the file Check to
456 // see if the magic bytes match and if they do, read the entire table of
457 // contents for the archive and cache it
459 data.SetData(data_sp, data_offset, data_sp->GetByteSize());
460 if (!file || !data_sp || !ObjectContainerBSDArchive::MagicBytesMatch(data))
463 const size_t initial_count = specs.GetSize();
464 llvm::sys::TimePoint<> file_mod_time = FileSystem::GetModificationTime(file);
465 Archive::shared_ptr archive_sp(
466 Archive::FindCachedArchive(file, ArchSpec(), file_mod_time, file_offset));
467 bool set_archive_arch = false;
469 set_archive_arch = true;
471 DataBufferLLVM::CreateSliceFromPath(file.GetPath(), file_size, file_offset);
473 data.SetData(data_sp, 0, data_sp->GetByteSize());
474 archive_sp = Archive::ParseAndCacheArchiveForFile(
475 file, ArchSpec(), file_mod_time, file_offset, data);
480 const size_t num_objects = archive_sp->GetNumObjects();
481 for (size_t idx = 0; idx < num_objects; ++idx) {
482 const Object *object = archive_sp->GetObjectAtIndex(idx);
484 const lldb::offset_t object_file_offset =
485 file_offset + object->ar_file_offset;
486 if (object->ar_file_offset < file_size &&
487 file_size > object_file_offset) {
488 if (ObjectFile::GetModuleSpecifications(
489 file, object_file_offset, file_size - object_file_offset,
492 specs.GetModuleSpecRefAtIndex(specs.GetSize() - 1);
493 llvm::sys::TimePoint<> object_mod_time(
494 std::chrono::seconds(object->ar_date));
495 spec.GetObjectName() = object->ar_name;
496 spec.SetObjectOffset(object_file_offset);
497 spec.SetObjectSize(file_size - object_file_offset);
498 spec.GetObjectModificationTime() = object_mod_time;
504 const size_t end_count = specs.GetSize();
505 size_t num_specs_added = end_count - initial_count;
506 if (set_archive_arch && num_specs_added > 0) {
507 // The archive was created but we didn't have an architecture so we need to
509 for (size_t i = initial_count; i < end_count; ++i) {
510 ModuleSpec module_spec;
511 if (specs.GetModuleSpecAtIndex(i, module_spec)) {
512 if (module_spec.GetArchitecture().IsValid()) {
513 archive_sp->SetArchitecture(module_spec.GetArchitecture());
519 return num_specs_added;