src/ld/parsers/archive_file.cpp

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  24
  25 #include <stdint.h>
  26 #include <math.h>
  27 #include <unistd.h>
  28 #include <sys/param.h>
  29 #include <mach-o/ranlib.h>
  30 #include <ar.h>
  31
  32 #include <vector>
  33 #include <set>
  34 #include <map>
  35 #include <algorithm>
  36 #include <ext/hash_map>
  37
  38 #include "MachOFileAbstraction.hpp"
  39 #include "Architectures.hpp"
  40
  41 #include "macho_relocatable_file.h"
  42 #include "lto_file.h"
  43 #include "archive_file.h"
  44
  45
  46 namespace archive {
  47
  48 typedef const struct ranlib* ConstRanLibPtr;
  49
  50 // forward reference
  51 template <typename A> class File;
  52
  53
  54 template <typename A>
  55 class Parser
  56 {
  57 public:
  58         typedef typename A::P                                   P;
  59
  60         static bool                                                                             validFile(const uint8_t* fileContent, uint64_t fileLength,
  61                                                                                                                                 const mach_o::relocatable::ParserOptions& opts) {
  62                                                                                                                 return File<A>::validFile(fileContent, fileLength, opts); }
  63         static File<A>*                                                                 parse(const uint8_t* fileContent, uint64_t fileLength,
  64                                                                                                                         const char* path, time_t mTime,
  65                                                                                                                         uint32_t ordinal, const ParserOptions& opts) {
  66                                                                                                                          return new File<A>(fileContent, fileLength, path, mTime,
  67                                                                                                                                                         ordinal, opts);
  68                                                                                                                 }
  69
  70 };
  71
  72 template <typename A>
  73 class File : public ld::archive::File
  74 {
  75 public:
  76         static bool                                                                             validFile(const uint8_t* fileContent, uint64_t fileLength,
  77                                                                                                                                 const mach_o::relocatable::ParserOptions& opts);
  78                                                                                                         File(const uint8_t* fileContent, uint64_t fileLength,
  79                                                                                                                         const char* pth, time_t modTime,
  80                                                                                                                         uint32_t ord, const ParserOptions& opts);
  81         virtual                                                                                 ~File() {}
  82
  83         // overrides of ld::File
  84         virtual bool                                                                            forEachAtom(ld::File::AtomHandler&) const;
  85         virtual bool                                                                            justInTimeforEachAtom(const char* name, ld::File::AtomHandler&) const;
  86         virtual uint32_t                                                                        subFileCount() const  { return _archiveFilelength/sizeof(ar_hdr); }
  87
  88         // overrides of ld::archive::File
  89         virtual bool                                                                            justInTimeDataOnlyforEachAtom(const char* name, ld::File::AtomHandler& handler) const;
  90
  91 private:
  92         static bool                                                                             validMachOFile(const uint8_t* fileContent, uint64_t fileLength,
  93                                                                                                                                         const mach_o::relocatable::ParserOptions& opts);
  94         static bool                                                                             validLTOFile(const uint8_t* fileContent, uint64_t fileLength,
  95                                                                                                                                         const mach_o::relocatable::ParserOptions& opts);
  96         static cpu_type_t                                                               architecture();
  97
  98         class Entry : ar_hdr
  99         {
 100         public:
 101                 const char*                     name() const;
 102                 time_t                          modificationTime() const;
 103                 const uint8_t*          content() const;
 104                 uint32_t                        contentSize() const;
 105                 const Entry*            next() const;
 106         private:
 107                 bool                            hasLongName() const;
 108                 unsigned int            getLongNameSpace() const;
 109
 110         };
 111
 112         class CStringEquals
 113         {
 114         public:
 115                 bool operator()(const char* left, const char* right) const { return (strcmp(left, right) == 0); }
 116         };
 117         typedef __gnu_cxx::hash_map<const char*, const struct ranlib*, __gnu_cxx::hash<const char*>, CStringEquals> NameToEntryMap;
 118
 119         typedef typename A::P                                                   P;
 120         typedef typename A::P::E                                                E;
 121
 122         struct MemberState { ld::relocatable::File* file; bool logged; bool loaded; };
 123
 124         typedef std::map<const class Entry*, MemberState> MemberToStateMap;
 125
 126         const struct ranlib*                                                    ranlibHashSearch(const char* name) const;
 127         MemberState&                                                                    makeObjectFileForMember(const Entry* member) const;
 128         bool                                                                                    memberHasObjCCategories(const Entry* member) const;
 129         void                                                                                    dumpTableOfContents();
 130         void                                                                                    buildHashTable();
 131
 132         const uint8_t*                                                                  _archiveFileContent;
 133         uint64_t                                                                                _archiveFilelength;
 134         const struct ranlib*                                                    _tableOfContents;
 135         uint32_t                                                                                _tableOfContentCount;
 136         const char*                                                                             _tableOfContentStrings;
 137         mutable MemberToStateMap                                                _instantiatedEntries;
 138         NameToEntryMap                                                                  _hashTable;
 139         const bool                                                                              _forceLoadAll;
 140         const bool                                                                              _forceLoadObjC;
 141         const bool                                                                              _forceLoadThis;
 142         const bool                                                                              _objc2ABI;
 143         const bool                                                                              _verboseLoad;
 144         const bool                                                                              _logAllFiles;
 145         const mach_o::relocatable::ParserOptions                _objOpts;
 146 };
 147
 148
 149 template <typename A>
 150 bool File<A>::Entry::hasLongName() const
 151 {
 152         return ( strncmp(this->ar_name, AR_EFMT1, strlen(AR_EFMT1)) == 0 );
 153 }
 154
 155 template <typename A>
 156 unsigned int File<A>::Entry::getLongNameSpace() const
 157 {
 158         char* endptr;
 159         long result = strtol(&this->ar_name[strlen(AR_EFMT1)], &endptr, 10);
 160         return result;
 161 }
 162
 163 template <typename A>
 164 const char* File<A>::Entry::name() const
 165 {
 166         if ( this->hasLongName() ) {
 167                 int len = this->getLongNameSpace();
 168                 static char longName[256];
 169                 strncpy(longName, ((char*)this)+sizeof(ar_hdr), len);
 170                 longName[len] = '\0';
 171                 return longName;
 172         }
 173         else {
 174                 static char shortName[20];
 175                 strncpy(shortName, this->ar_name, 16);
 176                 shortName[16] = '\0';
 177                 char* space = strchr(shortName, ' ');
 178                 if ( space != NULL )
 179                         *space = '\0';
 180                 return shortName;
 181         }
 182 }
 183
 184 template <typename A>
 185 time_t  File<A>::Entry::modificationTime() const
 186 {
 187         char temp[14];
 188         strncpy(temp, this->ar_date, 12);
 189         temp[12] = '\0';
 190         char* endptr;
 191         return (time_t)strtol(temp, &endptr, 10);
 192 }
 193
 194
 195 template <typename A>
 196 const uint8_t* File<A>::Entry::content() const
 197 {
 198         if ( this->hasLongName() )
 199                 return ((uint8_t*)this) + sizeof(ar_hdr) + this->getLongNameSpace();
 200         else
 201                 return ((uint8_t*)this) + sizeof(ar_hdr);
 202 }
 203
 204
 205 template <typename A>
 206 uint32_t File<A>::Entry::contentSize() const
 207 {
 208         char temp[12];
 209         strncpy(temp, this->ar_size, 10);
 210         temp[10] = '\0';
 211         char* endptr;
 212         long size = strtol(temp, &endptr, 10);
 213         // long name is included in ar_size
 214         if ( this->hasLongName() )
 215                 size -= this->getLongNameSpace();
 216         return size;
 217 }
 218
 219
 220 template <typename A>
 221 const class File<A>::Entry* File<A>::Entry::next() const
 222 {
 223         const uint8_t* p = this->content() + contentSize();
 224         p = (const uint8_t*)(((uintptr_t)p+3) & (-4));  // 4-byte align
 225         return (class File<A>::Entry*)p;
 226 }
 227
 228
 229 template <> cpu_type_t File<x86>::architecture()    { return CPU_TYPE_I386; }
 230 template <> cpu_type_t File<x86_64>::architecture() { return CPU_TYPE_X86_64; }
 231 template <> cpu_type_t File<arm>::architecture()    { return CPU_TYPE_ARM; }
 232
 233
 234 template <typename A>
 235 bool File<A>::validMachOFile(const uint8_t* fileContent, uint64_t fileLength, const mach_o::relocatable::ParserOptions& opts)
 236 {
 237         return mach_o::relocatable::isObjectFile(fileContent, fileLength, opts);
 238 }
 239
 240 template <typename A>
 241 bool File<A>::validLTOFile(const uint8_t* fileContent, uint64_t fileLength, const mach_o::relocatable::ParserOptions& opts)
 242 {
 243         return lto::isObjectFile(fileContent, fileLength, opts.architecture, opts.subType);
 244 }
 245
 246
 247
 248 template <typename A>
 249 bool File<A>::validFile(const uint8_t* fileContent, uint64_t fileLength, const mach_o::relocatable::ParserOptions& opts)
 250 {
 251         // must have valid archive header
 252         if ( strncmp((const char*)fileContent, "!<arch>\n", 8) != 0 )
 253                 return false;
 254
 255         // peak at first .o file and verify it is correct architecture
 256         const Entry* const start = (Entry*)&fileContent[8];
 257         const Entry* const end = (Entry*)&fileContent[fileLength];
 258         for (const Entry* p=start; p < end; p = p->next()) {
 259                 const char* memberName = p->name();
 260                 // skip option table-of-content member
 261                 if ( (p==start) && ((strcmp(memberName, SYMDEF_SORTED) == 0) || (strcmp(memberName, SYMDEF) == 0)) )
 262                         continue;
 263                 // archive is valid if first .o file is valid
 264                 return (validMachOFile(p->content(), p->contentSize(), opts) || validLTOFile(p->content(), p->contentSize(), opts));
 265         }
 266         // empty archive
 267         return true;
 268 }
 269
 270
 271 template <typename A>
 272 File<A>::File(const uint8_t fileContent[], uint64_t fileLength, const char* pth, time_t modTime,
 273                                         uint32_t ord, const ParserOptions& opts)
 274  : ld::archive::File(strdup(pth), modTime, ord),
 275         _archiveFileContent(fileContent), _archiveFilelength(fileLength),
 276         _tableOfContents(NULL), _tableOfContentCount(0), _tableOfContentStrings(NULL),
 277         _forceLoadAll(opts.forceLoadAll), _forceLoadObjC(opts.forceLoadObjC),
 278         _forceLoadThis(opts.forceLoadThisArchive), _objc2ABI(opts.objcABI2), _verboseLoad(opts.verboseLoad),
 279         _logAllFiles(opts.logAllFiles), _objOpts(opts.objOpts)
 280 {
 281         if ( strncmp((const char*)fileContent, "!<arch>\n", 8) != 0 )
 282                 throw "not an archive";
 283
 284         if ( !_forceLoadAll ) {
 285                 const Entry* const firstMember = (Entry*)&_archiveFileContent[8];
 286                 if ( (strcmp(firstMember->name(), SYMDEF_SORTED) == 0) || (strcmp(firstMember->name(), SYMDEF) == 0) ) {
 287                         const uint8_t* contents = firstMember->content();
 288                         uint32_t ranlibArrayLen = E::get32(*((uint32_t*)contents));
 289                         _tableOfContents = (const struct ranlib*)&contents[4];
 290                         _tableOfContentCount = ranlibArrayLen / sizeof(struct ranlib);
 291                         _tableOfContentStrings = (const char*)&contents[ranlibArrayLen+8];
 292                         if ( ((uint8_t*)(&_tableOfContents[_tableOfContentCount]) > &fileContent[fileLength])
 293                                 || ((uint8_t*)_tableOfContentStrings > &fileContent[fileLength]) )
 294                                 throw "malformed archive, perhaps wrong architecture";
 295                         this->buildHashTable();
 296                 }
 297                 else
 298                         throw "archive has no table of contents";
 299         }
 300 }
 301
 302 template <>
 303 bool File<x86>::memberHasObjCCategories(const Entry* member) const
 304 {
 305         if ( _objc2ABI ) {
 306                 // i386 for iOS simulator uses ObjC2 which has no global symbol for categories
 307                 return mach_o::relocatable::hasObjC2Categories(member->content());
 308         }
 309         else {
 310                 // i386 uses ObjC1 ABI which has .objc_category* global symbols
 311                 return false;
 312         }
 313 }
 314
 315
 316
 317 template <typename A>
 318 bool File<A>::memberHasObjCCategories(const Entry* member) const
 319 {
 320         // x86_64 and ARM use ObjC2 which has no global symbol for categories
 321         return mach_o::relocatable::hasObjC2Categories(member->content());
 322 }
 323
 324
 325 template <typename A>
 326 typename File<A>::MemberState& File<A>::makeObjectFileForMember(const Entry* member) const
 327 {
 328         // in case member was instantiated earlier but not needed yet
 329         typename MemberToStateMap::iterator pos = _instantiatedEntries.find(member);
 330         if ( pos != _instantiatedEntries.end() )
 331                 return pos->second;
 332
 333         const char* memberName = member->name();
 334         char memberPath[strlen(this->path()) + strlen(memberName)+4];
 335         strcpy(memberPath, this->path());
 336         strcat(memberPath, "(");
 337         strcat(memberPath, memberName);
 338         strcat(memberPath, ")");
 339         //fprintf(stderr, "using %s from %s\n", memberName, this->path());
 340         try {
 341                 // range check
 342                 if ( member > (Entry*)(_archiveFileContent+_archiveFilelength) )
 343                         throwf("corrupt archive, member starts past end of file");
 344                 if ( (member->content() + member->contentSize()) > (_archiveFileContent+_archiveFilelength) )
 345                         throwf("corrupt archive, member contents extends past end of file");
 346                 const char* mPath = strdup(memberPath);
 347                 // offset the ordinals in this mach-o .o file, so that atoms layout in same order as in archive
 348                 uint32_t memberIndex = ((uint8_t*)member - _archiveFileContent)/sizeof(ar_hdr);
 349                 // see if member is mach-o file
 350                 ld::relocatable::File* result = mach_o::relocatable::parse(member->content(), member->contentSize(),
 351                                                                                                                                         mPath, member->modificationTime(),
 352                                                                                                                                         this->ordinal() + memberIndex, _objOpts);
 353                 if ( result != NULL ) {
 354                         MemberState state = {result, false, false};
 355                         _instantiatedEntries[member] = state;
 356                         return _instantiatedEntries[member];
 357                 }
 358                 // see if member is llvm bitcode file
 359                 result = lto::parse(member->content(), member->contentSize(),
 360                                                                 mPath, member->modificationTime(), this->ordinal() + memberIndex,
 361                                                                 _objOpts.architecture, _objOpts.subType, _logAllFiles);
 362                 if ( result != NULL ) {
 363                         MemberState state = {result, false, false};
 364                         _instantiatedEntries[member] = state;
 365                         return _instantiatedEntries[member];
 366                 }
 367
 368                 throwf("archive member '%s' with length %d is not mach-o or llvm bitcode", memberName, member->contentSize());
 369         }
 370         catch (const char* msg) {
 371                 throwf("in %s, %s", memberPath, msg);
 372         }
 373 }
 374
 375
 376 template <typename A>
 377 bool File<A>::forEachAtom(ld::File::AtomHandler& handler) const
 378 {
 379         bool didSome = false;
 380         if ( _forceLoadAll || _forceLoadThis ) {
 381                 // call handler on all .o files in this archive
 382                 const Entry* const start = (Entry*)&_archiveFileContent[8];
 383                 const Entry* const end = (Entry*)&_archiveFileContent[_archiveFilelength];
 384                 for (const Entry* p=start; p < end; p = p->next()) {
 385                         const char* memberName = p->name();
 386                         if ( (p==start) && ((strcmp(memberName, SYMDEF_SORTED) == 0) || (strcmp(memberName, SYMDEF) == 0)) )
 387                                 continue;
 388                         MemberState& state = this->makeObjectFileForMember(p);
 389                         if ( _verboseLoad ) {
 390                                 if ( _forceLoadThis )
 391                                         printf("-force_load forced load of %s(%s)\n", this->path(), memberName);
 392                                 else
 393                                         printf("-all_load forced load of %s(%s)\n", this->path(), memberName);
 394                                 state.logged = true;
 395                         }
 396                         didSome |= state.file->forEachAtom(handler);
 397                         state.loaded = true;
 398                 }
 399         }
 400         else if ( _forceLoadObjC ) {
 401                 // call handler on all .o files in this archive containing objc classes
 402                 for(typename NameToEntryMap::const_iterator it = _hashTable.begin(); it != _hashTable.end(); ++it) {
 403                         if ( (strncmp(it->first, ".objc_c", 7) == 0) || (strncmp(it->first, "_OBJC_CLASS_$_", 14) == 0) ) {
 404                                 const Entry* member = (Entry*)&_archiveFileContent[E::get32(it->second->ran_off)];
 405                                 MemberState& state = this->makeObjectFileForMember(member);
 406                                 if ( _verboseLoad && !state.logged ) {
 407                                         printf("-ObjC forced load of %s(%s)\n", this->path(), member->name());
 408                                         state.logged = true;
 409                                 }
 410                                 if ( ! state.loaded ) {
 411                                         didSome |= state.file->forEachAtom(handler);
 412                                         state.loaded = true;
 413                                 }
 414                         }
 415                 }
 416                 // ObjC2 has no symbols in .o files with categories but not classes, look deeper for those
 417                 const Entry* const start = (Entry*)&_archiveFileContent[8];
 418                 const Entry* const end = (Entry*)&_archiveFileContent[_archiveFilelength];
 419                 for (const Entry* member=start; member < end; member = member->next()) {
 420                         // only look at files not already instantiated
 421                         if ( _instantiatedEntries.count(member) == 0 ) {
 422                                 //fprintf(stderr, "checking member %s\n", member->name());
 423                                 if ( this->memberHasObjCCategories(member) ) {
 424                                         MemberState& state = this->makeObjectFileForMember(member);
 425                                         if ( _verboseLoad && !state.logged ) {
 426                                                 printf("-ObjC forced load of %s(%s)\n", this->path(), member->name());
 427                                                 state.logged = true;
 428                                         }
 429                                         if ( ! state.loaded ) {
 430                                                 didSome |= state.file->forEachAtom(handler);
 431                                                 state.loaded = true;
 432                                         }
 433                                 }
 434                         }
 435                 }
 436         }
 437         return didSome;
 438 }
 439
 440 template <typename A>
 441 bool File<A>::justInTimeforEachAtom(const char* name, ld::File::AtomHandler& handler) const
 442 {
 443         // in force load case, all members already loaded
 444         if ( _forceLoadAll || _forceLoadThis )
 445                 return false;
 446
 447         // do a hash search of table of contents looking for requested symbol
 448         const struct ranlib* result = ranlibHashSearch(name);
 449         if ( result != NULL ) {
 450                 const Entry* member = (Entry*)&_archiveFileContent[E::get32(result->ran_off)];
 451                 MemberState& state = this->makeObjectFileForMember(member);
 452                 // only call handler for each member once
 453                 if ( ! state.loaded && !state.logged ) {
 454                         if ( _verboseLoad ) {
 455                                 printf("%s forced load of %s(%s)\n", name, this->path(), member->name());
 456                                 state.logged = true;
 457                         }
 458                         state.loaded = true;
 459                         return state.file->forEachAtom(handler);
 460                 }
 461         }
 462         //fprintf(stderr, "%s NOT found in archive %s\n", name, this->path());
 463         return false;
 464 }
 465
 466 class CheckIsDataSymbolHandler : public ld::File::AtomHandler
 467 {
 468 public:
 469                                         CheckIsDataSymbolHandler(const char* n) : _name(n), _isData(false) {}
 470         virtual void    doAtom(const class ld::Atom& atom) {
 471                                                 if ( strcmp(atom.name(), _name) == 0 ) {
 472                                                         if ( atom.section().type() != ld::Section::typeCode )
 473                                                                 _isData = true;
 474                                                 }
 475                                         }
 476         virtual void    doFile(const class ld::File&) {}
 477         bool                    symbolIsDataDefinition() { return _isData; }
 478
 479 private:
 480         const char*             _name;
 481         bool                    _isData;
 482
 483 };
 484
 485 template <typename A>
 486 bool File<A>::justInTimeDataOnlyforEachAtom(const char* name, ld::File::AtomHandler& handler) const
 487 {
 488         // in force load case, all members already loaded
 489         if ( _forceLoadAll || _forceLoadThis )
 490                 return false;
 491
 492         // do a hash search of table of contents looking for requested symbol
 493         const struct ranlib* result = ranlibHashSearch(name);
 494         if ( result != NULL ) {
 495                 const Entry* member = (Entry*)&_archiveFileContent[E::get32(result->ran_off)];
 496                 MemberState& state = this->makeObjectFileForMember(member);
 497                 // only call handler for each member once
 498                 if ( ! state.loaded ) {
 499                         CheckIsDataSymbolHandler checker(name);
 500                         state.file->forEachAtom(checker);
 501                         if ( checker.symbolIsDataDefinition() ) {
 502                                 if ( _verboseLoad && !state.logged ) {
 503                                         printf("%s forced load of %s(%s)\n", name, this->path(), member->name());
 504                                         state.logged = true;
 505                                 }
 506                                 state.loaded = true;
 507                                 return state.file->forEachAtom(handler);
 508                         }
 509                 }
 510         }
 511         //fprintf(stderr, "%s NOT found in archive %s\n", name, this->path());
 512         return false;
 513 }
 514
 515
 516 typedef const struct ranlib* ConstRanLibPtr;
 517
 518 template <typename A>
 519 ConstRanLibPtr  File<A>::ranlibHashSearch(const char* name) const
 520 {
 521         typename NameToEntryMap::const_iterator pos = _hashTable.find(name);
 522         if ( pos != _hashTable.end() )
 523                 return pos->second;
 524         else
 525                 return NULL;
 526 }
 527
 528 template <typename A>
 529 void File<A>::buildHashTable()
 530 {
 531         // walk through list backwards, adding/overwriting entries
 532         // this assures that with duplicates those earliest in the list will be found
 533         for (int i = _tableOfContentCount-1; i >= 0; --i) {
 534                 const struct ranlib* entry = &_tableOfContents[i];
 535                 const char* entryName = &_tableOfContentStrings[E::get32(entry->ran_un.ran_strx)];
 536                 if ( E::get32(entry->ran_off) > _archiveFilelength ) {
 537                         throwf("malformed archive TOC entry for %s, offset %d is beyond end of file %lld\n",
 538                                 entryName, entry->ran_off, _archiveFilelength);
 539                 }
 540
 541                 //const Entry* member = (Entry*)&_archiveFileContent[E::get32(entry->ran_off)];
 542                 //fprintf(stderr, "adding hash %d, %s -> %p\n", i, entryName, entry);
 543                 _hashTable[entryName] = entry;
 544         }
 545 }
 546
 547 template <typename A>
 548 void File<A>::dumpTableOfContents()
 549 {
 550         for (unsigned int i=0; i < _tableOfContentCount; ++i) {
 551                 const struct ranlib* e = &_tableOfContents[i];
 552                 printf("%s in %s\n", &_tableOfContentStrings[E::get32(e->ran_un.ran_strx)], ((Entry*)&_archiveFileContent[E::get32(e->ran_off)])->name());
 553         }
 554 }
 555
 556
 557 //
 558 // main function used by linker to instantiate archive files
 559 //
 560 ld::archive::File* parse(const uint8_t* fileContent, uint64_t fileLength,
 561                                 const char* path, time_t modTime, uint32_t ordinal, const ParserOptions& opts)
 562 {
 563         switch ( opts.objOpts.architecture ) {
 564                 case CPU_TYPE_X86_64:
 565                         if ( archive::Parser<x86_64>::validFile(fileContent, fileLength, opts.objOpts) )
 566                                 return archive::Parser<x86_64>::parse(fileContent, fileLength, path, modTime, ordinal, opts);
 567                         break;
 568                 case CPU_TYPE_I386:
 569                         if ( archive::Parser<x86>::validFile(fileContent, fileLength, opts.objOpts) )
 570                                 return archive::Parser<x86>::parse(fileContent, fileLength, path, modTime, ordinal, opts);
 571                         break;
 572                 case CPU_TYPE_ARM:
 573                         if ( archive::Parser<arm>::validFile(fileContent, fileLength, opts.objOpts) )
 574                                 return archive::Parser<arm>::parse(fileContent, fileLength, path, modTime, ordinal, opts);
 575                         break;
 576         }
 577         return NULL;
 578 }
 579
 580
 581
 582 }; // namespace archive
 583
 584