src/ld/InputFiles.cpp

   1
   2 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-*
   3  *
   4  * Copyright (c) 2009-2011 Apple Inc. All rights reserved.
   5  *
   6  * @APPLE_LICENSE_HEADER_START@
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26
  27 #include <stdlib.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <sys/mman.h>
  31 #include <sys/sysctl.h>
  32 #include <fcntl.h>
  33 #include <errno.h>
  34 #include <limits.h>
  35 #include <unistd.h>
  36 #include <mach/mach_time.h>
  37 #include <mach/vm_statistics.h>
  38 #include <mach/mach_init.h>
  39 #include <mach/mach_host.h>
  40 #include <dlfcn.h>
  41 #include <mach-o/dyld.h>
  42 #include <mach-o/fat.h>
  43 #include <sys/sysctl.h>
  44 #include <libkern/OSAtomic.h>
  45
  46 #include <string>
  47 #include <map>
  48 #include <set>
  49 #include <string>
  50 #include <vector>
  51 #include <list>
  52 #include <algorithm>
  53 #include <dlfcn.h>
  54 #include <AvailabilityMacros.h>
  55
  56 #include "Options.h"
  57
  58 #include "InputFiles.h"
  59 #include "macho_relocatable_file.h"
  60 #include "macho_dylib_file.h"
  61 #include "textstub_dylib_file.hpp"
  62 #include "archive_file.h"
  63 #include "lto_file.h"
  64 #include "opaque_section_file.h"
  65 #include "MachOFileAbstraction.hpp"
  66 #include "Snapshot.h"
  67
  68 const bool _s_logPThreads = false;
  69
  70 namespace ld {
  71 namespace tool {
  72
  73 class IgnoredFile : public ld::File {
  74 public:
  75         IgnoredFile(const char* pth, time_t modTime, Ordinal ord, Type type) : ld::File(pth, modTime, ord, type) {};
  76         virtual bool                                            forEachAtom(AtomHandler&) const { return false; };
  77         virtual bool                                            justInTimeforEachAtom(const char* name, AtomHandler&) const { return false; };
  78 };
  79
  80
  81 class DSOHandleAtom : public ld::Atom {
  82 public:
  83                                                                         DSOHandleAtom(const char* nm, ld::Atom::Scope sc,
  84                                                                                                                 ld::Atom::SymbolTableInclusion inc, ld::Section& sect=_s_section)
  85                                                                                 : ld::Atom(sect, ld::Atom::definitionRegular,
  86                                                                                                    (sect == _s_section_text) ? ld::Atom::combineByName : ld::Atom::combineNever,
  87                                                                                                    // make "weak def" so that link succeeds even if app defines __dso_handle
  88                                                                                                         sc, ld::Atom::typeUnclassified, inc, true, false, false,
  89                                                                                                          ld::Atom::Alignment(1)), _name(nm) {}
  90
  91         virtual ld::File*                                               file() const                                    { return NULL; }
  92   virtual const char*                                           name() const                                    { return _name; }
  93         virtual uint64_t                                                size() const                                    { return 0; }
  94         virtual uint64_t                                                objectAddress() const                   { return 0; }
  95         virtual void                                                    copyRawContent(uint8_t buffer[]) const
  96                                                                                                                                                         { }
  97         virtual void                                                    setScope(Scope)                                 { }
  98
  99         virtual                                                                 ~DSOHandleAtom() {}
 100
 101         static ld::Section                                              _s_section;
 102         static ld::Section                                              _s_section_preload;
 103         static ld::Section                                              _s_section_text;
 104         static DSOHandleAtom                                    _s_atomAll;
 105         static DSOHandleAtom                                    _s_atomExecutable;
 106         static DSOHandleAtom                                    _s_atomDylib;
 107         static DSOHandleAtom                                    _s_atomBundle;
 108         static DSOHandleAtom                                    _s_atomDyld;
 109         static DSOHandleAtom                                    _s_atomObjectFile;
 110         static DSOHandleAtom                                    _s_atomPreload;
 111         static DSOHandleAtom                                    _s_atomPreloadDSO;
 112 private:
 113         const char*                                                             _name;
 114 };
 115 ld::Section DSOHandleAtom::_s_section("__TEXT", "__mach_header", ld::Section::typeMachHeader, true);
 116 ld::Section DSOHandleAtom::_s_section_preload("__HEADER", "__mach_header", ld::Section::typeMachHeader, true);
 117 ld::Section DSOHandleAtom::_s_section_text("__TEXT", "__text", ld::Section::typeCode, false);
 118 DSOHandleAtom DSOHandleAtom::_s_atomAll("___dso_handle", ld::Atom::scopeLinkageUnit, ld::Atom::symbolTableNotIn);
 119 DSOHandleAtom DSOHandleAtom::_s_atomExecutable("__mh_execute_header", ld::Atom::scopeGlobal, ld::Atom::symbolTableInAndNeverStrip);
 120 DSOHandleAtom DSOHandleAtom::_s_atomDylib("__mh_dylib_header", ld::Atom::scopeLinkageUnit, ld::Atom::symbolTableNotIn);
 121 DSOHandleAtom DSOHandleAtom::_s_atomBundle("__mh_bundle_header", ld::Atom::scopeLinkageUnit, ld::Atom::symbolTableNotIn);
 122 DSOHandleAtom DSOHandleAtom::_s_atomDyld("__mh_dylinker_header", ld::Atom::scopeLinkageUnit, ld::Atom::symbolTableNotIn);
 123 DSOHandleAtom DSOHandleAtom::_s_atomObjectFile("__mh_object_header", ld::Atom::scopeLinkageUnit, ld::Atom::symbolTableNotIn);
 124 DSOHandleAtom DSOHandleAtom::_s_atomPreload("__mh_preload_header", ld::Atom::scopeLinkageUnit, ld::Atom::symbolTableNotIn, _s_section_preload);
 125 DSOHandleAtom DSOHandleAtom::_s_atomPreloadDSO("___dso_handle", ld::Atom::scopeLinkageUnit, ld::Atom::symbolTableNotIn, _s_section_text);
 126
 127
 128
 129 class PageZeroAtom : public ld::Atom {
 130 public:
 131                                                                         PageZeroAtom(uint64_t sz)
 132                                                                                 : ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
 133                                                                                         ld::Atom::scopeTranslationUnit, ld::Atom::typeZeroFill,
 134                                                                                         symbolTableNotIn, true, false, false, ld::Atom::Alignment(12)),
 135                                                                                         _size(sz) {}
 136
 137         virtual ld::File*                                               file() const                                    { return NULL; }
 138         virtual const char*                                             name() const                                    { return "page zero"; }
 139         virtual uint64_t                                                size() const                                    { return _size; }
 140         virtual uint64_t                                                objectAddress() const                   { return 0; }
 141         virtual void                                                    copyRawContent(uint8_t buffer[]) const
 142                                                                                                                                                         { }
 143         virtual void                                                    setScope(Scope)                                 { }
 144
 145         virtual                                                                 ~PageZeroAtom() {}
 146
 147         static ld::Section                                              _s_section;
 148         static DSOHandleAtom                                    _s_atomAll;
 149 private:
 150         uint64_t                                                                _size;
 151 };
 152 ld::Section PageZeroAtom::_s_section("__PAGEZERO", "__pagezero", ld::Section::typePageZero, true);
 153
 154
 155 class CustomStackAtom : public ld::Atom {
 156 public:
 157                                                                         CustomStackAtom(uint64_t sz)
 158                                                                                 : ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
 159                                                                                         ld::Atom::scopeTranslationUnit, ld::Atom::typeZeroFill,
 160                                                                                         symbolTableNotIn, false, false, false, ld::Atom::Alignment(12)),
 161                                                                                         _size(sz) {}
 162
 163         virtual ld::File*                                               file() const                                    { return NULL; }
 164         virtual const char*                                             name() const                                    { return "custom stack"; }
 165         virtual uint64_t                                                size() const                                    { return _size; }
 166         virtual uint64_t                                                objectAddress() const                   { return 0; }
 167         virtual void                                                    copyRawContent(uint8_t buffer[]) const
 168                                                                                                                                                         { }
 169         virtual void                                                    setScope(Scope)                                 { }
 170
 171         virtual                                                                 ~CustomStackAtom() {}
 172
 173 private:
 174         uint64_t                                                                _size;
 175         static ld::Section                                              _s_section;
 176 };
 177 ld::Section CustomStackAtom::_s_section("__UNIXSTACK", "__stack", ld::Section::typeStack, true);
 178
 179
 180
 181 const char* InputFiles::fileArch(const uint8_t* p, unsigned len)
 182 {
 183         const char* result = mach_o::relocatable::archName(p);
 184         if ( result != NULL  )
 185                  return result;
 186
 187     result = mach_o::dylib::archName(p);
 188     if ( result != NULL  )
 189                 return result;
 190
 191         result = lto::archName(p, len);
 192         if ( result != NULL  )
 193                  return result;
 194
 195         if ( strncmp((const char*)p, "!<arch>\n", 8) == 0 )
 196                 return "archive";
 197
 198         char *unsupported = (char *)malloc(128);
 199         strcpy(unsupported, "unsupported file format (");
 200         for (unsigned i=0; i<len && i < 16; i++) {
 201                 char buf[8];
 202                 sprintf(buf, " 0x%02X", p[i]);
 203                 strcat(unsupported, buf);
 204         }
 205         strcat(unsupported, " )");
 206         return unsupported;
 207 }
 208
 209
 210 ld::File* InputFiles::makeFile(const Options::FileInfo& info, bool indirectDylib)
 211 {
 212         // map in whole file
 213         uint64_t len = info.fileLen;
 214         int fd = ::open(info.path, O_RDONLY, 0);
 215         if ( fd == -1 )
 216                 throwf("can't open file, errno=%d", errno);
 217         if ( info.fileLen < 20 )
 218                 throwf("file too small (length=%llu)", info.fileLen);
 219
 220         uint8_t* p = (uint8_t*)::mmap(NULL, info.fileLen, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0);
 221         if ( p == (uint8_t*)(-1) )
 222                 throwf("can't map file, errno=%d", errno);
 223
 224         // if fat file, skip to architecture we want
 225         // Note: fat header is always big-endian
 226         bool isFatFile = false;
 227         uint32_t sliceToUse, sliceCount;
 228         const fat_header* fh = (fat_header*)p;
 229         if ( fh->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
 230                 isFatFile = true;
 231                 const struct fat_arch* archs = (struct fat_arch*)(p + sizeof(struct fat_header));
 232                 bool sliceFound = false;
 233                 sliceCount = OSSwapBigToHostInt32(fh->nfat_arch);
 234                 if ( _options.preferSubArchitecture() ) {
 235                         // first try to find a slice that match cpu-type and cpu-sub-type
 236                         for (uint32_t i=0; i < sliceCount; ++i) {
 237                                 if ( (OSSwapBigToHostInt32(archs[i].cputype) == (uint32_t)_options.architecture())
 238                                   && (OSSwapBigToHostInt32(archs[i].cpusubtype) == (uint32_t)_options.subArchitecture()) ) {
 239                                         sliceToUse = i;
 240                                         sliceFound = true;
 241                                         break;
 242                                 }
 243                         }
 244                 }
 245                 if ( !sliceFound ) {
 246                         // look for any slice that matches just cpu-type
 247                         for (uint32_t i=0; i < sliceCount; ++i) {
 248                                 if ( OSSwapBigToHostInt32(archs[i].cputype) == (uint32_t)_options.architecture() ) {
 249                                         sliceToUse = i;
 250                                         sliceFound = true;
 251                                         break;
 252                                 }
 253                         }
 254                 }
 255                 if ( sliceFound ) {
 256                         uint32_t fileOffset = OSSwapBigToHostInt32(archs[sliceToUse].offset);
 257                         len = OSSwapBigToHostInt32(archs[sliceToUse].size);
 258                         if ( fileOffset+len > info.fileLen ) {
 259                                 // <rdar://problem/17593430> file size was read awhile ago.  If file is being written, wait a second to see if big enough now
 260                                 sleep(1);
 261                                 uint64_t newFileLen = info.fileLen;
 262                                 struct stat statBuffer;
 263                                 if ( stat(info.path, &statBuffer) == 0 ) {
 264                                         newFileLen = statBuffer.st_size;
 265                                 }
 266                                 if ( fileOffset+len > newFileLen ) {
 267                                         throwf("truncated fat file. Slice from %u to %llu is past end of file with length %llu",
 268                                                 fileOffset, fileOffset+len, info.fileLen);
 269                                 }
 270                         }
 271                         // if requested architecture is page aligned within fat file, then remap just that portion of file
 272                         if ( (fileOffset & 0x00000FFF) == 0 ) {
 273                                 // unmap whole file
 274                                 munmap((caddr_t)p, info.fileLen);
 275                                 // re-map just part we need
 276                                 p = (uint8_t*)::mmap(NULL, len, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, fileOffset);
 277                                 if ( p == (uint8_t*)(-1) )
 278                                         throwf("can't re-map file, errno=%d", errno);
 279                         }
 280                         else {
 281                                 p = &p[fileOffset];
 282                         }
 283                 }
 284         }
 285         ::close(fd);
 286
 287         // see if it is an object file
 288         mach_o::relocatable::ParserOptions objOpts;
 289         objOpts.architecture            = _options.architecture();
 290         objOpts.objSubtypeMustMatch = !_options.allowSubArchitectureMismatches();
 291         objOpts.logAllFiles                     = _options.logAllFiles();
 292         objOpts.warnUnwindConversionProblems    = _options.needsUnwindInfoSection();
 293         objOpts.keepDwarfUnwind         = _options.keepDwarfUnwind();
 294         objOpts.forceDwarfConversion= (_options.outputKind() == Options::kDyld);
 295         objOpts.neverConvertDwarf   = !_options.needsUnwindInfoSection();
 296         objOpts.verboseOptimizationHints = _options.verboseOptimizationHints();
 297         objOpts.armUsesZeroCostExceptions = _options.armUsesZeroCostExceptions();
 298         objOpts.simulator                       = _options.targetIOSSimulator();
 299         objOpts.ignoreMismatchPlatform = ((_options.outputKind() == Options::kPreload) || (_options.outputKind() == Options::kStaticExecutable));
 300         objOpts.subType                         = _options.subArchitecture();
 301         objOpts.platform                        = _options.platform();
 302         objOpts.minOSVersion            = _options.minOSversion();
 303         objOpts.srcKind                         = ld::relocatable::File::kSourceObj;
 304         objOpts.treateBitcodeAsData     = _options.bitcodeKind() == Options::kBitcodeAsData;
 305         objOpts.usingBitcode            = _options.bundleBitcode();
 306
 307         ld::relocatable::File* objResult = mach_o::relocatable::parse(p, len, info.path, info.modTime, info.ordinal, objOpts);
 308         if ( objResult != NULL ) {
 309                 OSAtomicAdd64(len, &_totalObjectSize);
 310                 OSAtomicIncrement32(&_totalObjectLoaded);
 311                 return objResult;
 312         }
 313
 314         // see if it is an llvm object file
 315         objResult = lto::parse(p, len, info.path, info.modTime, info.ordinal, _options.architecture(), _options.subArchitecture(), _options.logAllFiles(), _options.verboseOptimizationHints());
 316         if ( objResult != NULL ) {
 317                 OSAtomicAdd64(len, &_totalObjectSize);
 318                 OSAtomicIncrement32(&_totalObjectLoaded);
 319                 return objResult;
 320         }
 321
 322         // see if it is a dynamic library (or text-based dynamic library)
 323         ld::dylib::File* dylibResult;
 324         bool dylibsNotAllowed = false;
 325         switch ( _options.outputKind() ) {
 326                 case Options::kDynamicExecutable:
 327                 case Options::kDynamicLibrary:
 328                 case Options::kDynamicBundle:
 329                         dylibResult = mach_o::dylib::parse(p, len, info.path, info.modTime, _options, info.ordinal, info.options.fBundleLoader, indirectDylib);
 330                         if ( dylibResult != NULL ) {
 331                                 return dylibResult;
 332                         }
 333                         dylibResult = textstub::dylib::parse(p, len, info.path, info.modTime, _options, info.ordinal, info.options.fBundleLoader, indirectDylib);
 334                         if ( dylibResult != NULL ) {
 335                                 return dylibResult;
 336                         }
 337                         break;
 338                 case Options::kStaticExecutable:
 339                 case Options::kDyld:
 340                 case Options::kPreload:
 341                 case Options::kObjectFile:
 342                 case Options::kKextBundle:
 343                         dylibsNotAllowed = true;
 344                         break;
 345         }
 346
 347         // see if it is a static library
 348         ::archive::ParserOptions archOpts;
 349         archOpts.objOpts                                = objOpts;
 350         archOpts.forceLoadThisArchive   = info.options.fForceLoad;
 351         archOpts.forceLoadAll                   = _options.fullyLoadArchives();
 352         archOpts.forceLoadObjC                  = _options.loadAllObjcObjectsFromArchives();
 353         archOpts.objcABI2                               = _options.objCABIVersion2POverride();
 354         archOpts.verboseLoad                    = _options.whyLoad();
 355         archOpts.logAllFiles                    = _options.logAllFiles();
 356         // Set ObjSource Kind, libclang_rt is compiler static library
 357         const char* libName = strrchr(info.path, '/');
 358         if ( (libName != NULL) && (strncmp(libName, "/libclang_rt", 12) == 0) )
 359                 archOpts.objOpts.srcKind = ld::relocatable::File::kSourceCompilerArchive;
 360         else
 361                 archOpts.objOpts.srcKind = ld::relocatable::File::kSourceArchive;
 362         archOpts.objOpts.treateBitcodeAsData = _options.bitcodeKind() == Options::kBitcodeAsData;
 363         archOpts.objOpts.usingBitcode = _options.bundleBitcode();
 364
 365         ld::archive::File* archiveResult = ::archive::parse(p, len, info.path, info.modTime, info.ordinal, archOpts);
 366         if ( archiveResult != NULL ) {
 367                 OSAtomicAdd64(len, &_totalArchiveSize);
 368                 OSAtomicIncrement32(&_totalArchivesLoaded);
 369                 return archiveResult;
 370         }
 371
 372         // does not seem to be any valid linker input file, check LTO misconfiguration problems
 373         if ( lto::archName((uint8_t*)p, len) != NULL ) {
 374                 if ( lto::libLTOisLoaded() ) {
 375                         throwf("lto file was built for %s which is not the architecture being linked (%s): %s", fileArch(p, len), _options.architectureName(), info.path);
 376                 }
 377                 else {
 378                         const char* libLTO = "libLTO.dylib";
 379                         char ldPath[PATH_MAX];
 380                         char tmpPath[PATH_MAX];
 381                         char libLTOPath[PATH_MAX];
 382                         uint32_t bufSize = PATH_MAX;
 383                         if ( _options.overridePathlibLTO() != NULL ) {
 384                                 libLTO = _options.overridePathlibLTO();
 385                         }
 386                         else if ( _NSGetExecutablePath(ldPath, &bufSize) != -1 ) {
 387                                 if ( realpath(ldPath, tmpPath) != NULL ) {
 388                                         char* lastSlash = strrchr(tmpPath, '/');
 389                                         if ( lastSlash != NULL )
 390                                                 strcpy(lastSlash, "/../lib/libLTO.dylib");
 391                                         libLTO = tmpPath;
 392                                         if ( realpath(tmpPath, libLTOPath) != NULL )
 393                                                 libLTO = libLTOPath;
 394                                 }
 395                         }
 396                         throwf("could not process llvm bitcode object file, because %s could not be loaded", libLTO);
 397                 }
 398         }
 399
 400         if ( dylibsNotAllowed ) {
 401                 cpu_type_t dummy1;
 402                 cpu_type_t dummy2;
 403                 if ( mach_o::dylib::isDylibFile(p, &dummy1, &dummy2) )
 404                         throw "ignoring unexpected dylib file";
 405         }
 406
 407         // error handling
 408         if ( ((fat_header*)p)->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
 409                 throwf("missing required architecture %s in file %s (%u slices)", _options.architectureName(), info.path, sliceCount);
 410         }
 411         else {
 412                 if ( isFatFile )
 413                         throwf("file is universal (%u slices) but does not contain a(n) %s slice: %s", sliceCount, _options.architectureName(), info.path);
 414                 else
 415                         throwf("file was built for %s which is not the architecture being linked (%s): %s", fileArch(p, len), _options.architectureName(), info.path);
 416         }
 417 }
 418
 419 void InputFiles::logDylib(ld::File* file, bool indirect)
 420 {
 421         if ( _options.traceDylibs() ) {
 422                 const char* fullPath = file->path();
 423                 char realName[MAXPATHLEN];
 424                 if ( realpath(fullPath, realName) != NULL )
 425                         fullPath = realName;
 426                 const ld::dylib::File* dylib = dynamic_cast<const ld::dylib::File*>(file);
 427                 if ( (dylib != NULL ) && dylib->willBeUpwardDylib() ) {
 428                         // don't log upward dylibs when XBS is computing dependencies
 429                         logTraceInfo("[Logging for XBS] Used upward dynamic library: %s\n", fullPath);
 430                 }
 431                 else {
 432                         if ( indirect )
 433                                 logTraceInfo("[Logging for XBS] Used indirect dynamic library: %s\n", fullPath);
 434                         else
 435                                 logTraceInfo("[Logging for XBS] Used dynamic library: %s\n", fullPath);
 436                 }
 437         }
 438
 439         if ( _options.dumpDependencyInfo() ) {
 440                 const ld::dylib::File* dylib = dynamic_cast<const ld::dylib::File*>(file);
 441                 if ( file == _bundleLoader ) {
 442                         _options.dumpDependency(Options::depBundleLoader, file->path());
 443                 }
 444                 else if ( (dylib != NULL ) && dylib->willBeUpwardDylib() ) {
 445                         if ( indirect )
 446                                 _options.dumpDependency(Options::depUpwardIndirectDylib, file->path());
 447                         else
 448                                 _options.dumpDependency(Options::depUpwardDirectDylib, file->path());
 449                 }
 450                 else {
 451                         if ( indirect )
 452                                 _options.dumpDependency(Options::depIndirectDylib, file->path());
 453                         else
 454                                 _options.dumpDependency(Options::depDirectDylib, file->path());
 455                 }
 456         }
 457 }
 458
 459 void InputFiles::logArchive(ld::File* file) const
 460 {
 461         if ( _options.traceArchives() && (_archiveFilesLogged.count(file) == 0) ) {
 462                 // <rdar://problem/4947347> LD_TRACE_ARCHIVES should only print out when a .o is actually used from an archive
 463                 _archiveFilesLogged.insert(file);
 464                 const char* fullPath = file->path();
 465                 char realName[MAXPATHLEN];
 466                 if ( realpath(fullPath, realName) != NULL )
 467                         fullPath = realName;
 468                 logTraceInfo("[Logging for XBS] Used static archive: %s\n", fullPath);
 469         }
 470 }
 471
 472
 473 void InputFiles::logTraceInfo(const char* format, ...) const
 474 {
 475         // one time open() of custom LD_TRACE_FILE
 476         static int trace_file = -1;
 477         if ( trace_file == -1 ) {
 478                 const char *trace_file_path = _options.traceOutputFile();
 479                 if ( trace_file_path != NULL ) {
 480                         trace_file = open(trace_file_path, O_WRONLY | O_APPEND | O_CREAT, 0666);
 481                         if ( trace_file == -1 )
 482                                 throwf("Could not open or create trace file (errno=%d): %s", errno, trace_file_path);
 483                 }
 484                 else {
 485                         trace_file = fileno(stderr);
 486                 }
 487         }
 488
 489         char trace_buffer[MAXPATHLEN * 2];
 490     va_list ap;
 491         va_start(ap, format);
 492         int length = vsnprintf(trace_buffer, sizeof(trace_buffer), format, ap);
 493         va_end(ap);
 494         char* buffer_ptr = trace_buffer;
 495
 496         while (length > 0) {
 497                 ssize_t amount_written = write(trace_file, buffer_ptr, length);
 498                 if(amount_written == -1)
 499                         /* Failure to write shouldn't fail the build. */
 500                         return;
 501                 buffer_ptr += amount_written;
 502                 length -= amount_written;
 503         }
 504 }
 505
 506
 507 ld::dylib::File* InputFiles::findDylib(const char* installPath, const char* fromPath)
 508 {
 509         //fprintf(stderr, "findDylib(%s, %s)\n", installPath, fromPath);
 510         InstallNameToDylib::iterator pos = _installPathToDylibs.find(installPath);
 511         if ( pos != _installPathToDylibs.end() ) {
 512                 return pos->second;
 513         }
 514         else {
 515                 // allow -dylib_path option to override indirect library to use
 516                 for (std::vector<Options::DylibOverride>::const_iterator dit = _options.dylibOverrides().begin(); dit != _options.dylibOverrides().end(); ++dit) {
 517                         if ( strcmp(dit->installName,installPath) == 0 ) {
 518                                 try {
 519                                         Options::FileInfo info = _options.findFile(dit->useInstead);
 520                                         _indirectDylibOrdinal = _indirectDylibOrdinal.nextIndirectDylibOrdinal();
 521                                         info.ordinal = _indirectDylibOrdinal;
 522                                         info.options.fIndirectDylib = true;
 523                                         ld::File* reader = this->makeFile(info, true);
 524                                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 525                                         if ( dylibReader != NULL ) {
 526                                                 addDylib(dylibReader, info);
 527                                                 //_installPathToDylibs[strdup(installPath)] = dylibReader;
 528                                                 this->logDylib(dylibReader, true);
 529                                                 return dylibReader;
 530                                         }
 531                                         else
 532                                                 throwf("indirect dylib at %s is not a dylib", dit->useInstead);
 533                                 }
 534                                 catch (const char* msg) {
 535                                         warning("ignoring -dylib_file option, %s", msg);
 536                                 }
 537                         }
 538                 }
 539                 char newPath[MAXPATHLEN];
 540                 // handle @loader_path
 541                 if ( strncmp(installPath, "@loader_path/", 13) == 0 ) {
 542                         strcpy(newPath, fromPath);
 543                         char* addPoint = strrchr(newPath,'/');
 544                         if ( addPoint != NULL )
 545                                 strcpy(&addPoint[1], &installPath[13]);
 546                         else
 547                                 strcpy(newPath, &installPath[13]);
 548                         installPath = newPath;
 549                 }
 550                 // note: @executable_path case is handled inside findFileUsingPaths()
 551                 // search for dylib using -F and -L paths
 552                 Options::FileInfo info = _options.findFileUsingPaths(installPath);
 553                 _indirectDylibOrdinal = _indirectDylibOrdinal.nextIndirectDylibOrdinal();
 554                 info.ordinal = _indirectDylibOrdinal;
 555                 info.options.fIndirectDylib = true;
 556                 try {
 557                         ld::File* reader = this->makeFile(info, true);
 558                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 559                         if ( dylibReader != NULL ) {
 560                                 //assert(_installPathToDylibs.find(installPath) !=  _installPathToDylibs.end());
 561                                 //_installPathToDylibs[strdup(installPath)] = dylibReader;
 562                                 addDylib(dylibReader, info);
 563                                 this->logDylib(dylibReader, true);
 564                                 return dylibReader;
 565                         }
 566                         else
 567                                 throwf("indirect dylib at %s is not a dylib", info.path);
 568                 }
 569                 catch (const char* msg) {
 570                         throwf("in '%s', %s", info.path, msg);
 571                 }
 572         }
 573 }
 574
 575
 576 // mark all dylibs initially specified as required, and check if they can be used
 577 void InputFiles::markExplicitlyLinkedDylibs()
 578 {
 579         for (InstallNameToDylib::iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); it++) {
 580                 it->second->setExplicitlyLinked();
 581                 this->checkDylibClientRestrictions(it->second);
 582         }
 583 }
 584
 585 bool InputFiles::libraryAlreadyLoaded(const char* path)
 586 {
 587         for (std::vector<ld::File*>::const_iterator it = _inputFiles.begin(); it != _inputFiles.end(); ++it) {
 588                 if ( strcmp(path, (*it)->path()) == 0 )
 589                         return true;
 590         }
 591         return false;
 592 }
 593
 594
 595 void InputFiles::addLinkerOptionLibraries(ld::Internal& state, ld::File::AtomHandler& handler)
 596 {
 597     if ( _options.outputKind() == Options::kObjectFile )
 598                 return;
 599
 600         // process frameworks specified in .o linker options
 601         for (CStringSet::const_iterator it = state.linkerOptionFrameworks.begin(); it != state.linkerOptionFrameworks.end(); ++it) {
 602                 const char* frameworkName = *it;
 603                 Options::FileInfo info = _options.findFramework(frameworkName);
 604                 if ( ! this->libraryAlreadyLoaded(info.path) ) {
 605                         info.ordinal = _linkerOptionOrdinal.nextLinkerOptionOrdinal();
 606                         try {
 607                                 ld::File* reader = this->makeFile(info, true);
 608                                 ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 609                                 if ( dylibReader != NULL ) {
 610                                         if ( ! dylibReader->installPathVersionSpecific() ) {
 611                                                 dylibReader->forEachAtom(handler);
 612                                                 dylibReader->setImplicitlyLinked();
 613                                                 this->addDylib(dylibReader, info);
 614                                         }
 615                                 }
 616                                 else {
 617                                         throwf("framework linker option at %s is not a dylib", info.path);
 618                                 }
 619                         }
 620                         catch (const char* msg) {
 621                                 warning("Auto-Linking supplied '%s', %s", info.path, msg);
 622                         }
 623                 }
 624         }
 625         // process libraries specified in .o linker options
 626         for (CStringSet::const_iterator it = state.linkerOptionLibraries.begin(); it != state.linkerOptionLibraries.end(); ++it) {
 627                 const char* libName = *it;
 628                 Options::FileInfo info = _options.findLibrary(libName);
 629                 if ( ! this->libraryAlreadyLoaded(info.path) ) {
 630                         info.ordinal = _linkerOptionOrdinal.nextLinkerOptionOrdinal();
 631                         try {
 632                                 //<rdar://problem/17787306> -force_load_swift_libs
 633                                 info.options.fForceLoad = _options.forceLoadSwiftLibs() && (strncmp(libName, "swift", 5) == 0);
 634                                 ld::File* reader = this->makeFile(info, true);
 635                                 ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 636                                 ld::archive::File* archiveReader = dynamic_cast<ld::archive::File*>(reader);
 637                                 if ( dylibReader != NULL ) {
 638                                         dylibReader->forEachAtom(handler);
 639                                         dylibReader->setImplicitlyLinked();
 640                                         this->addDylib(dylibReader, info);
 641                                 }
 642                                 else if ( archiveReader != NULL ) {
 643                                         _searchLibraries.push_back(LibraryInfo(archiveReader));
 644                                         if ( _options.dumpDependencyInfo() )
 645                                                 _options.dumpDependency(Options::depArchive, archiveReader->path());
 646                                         //<rdar://problem/17787306> -force_load_swift_libs
 647                                         if (info.options.fForceLoad) {
 648                                                 archiveReader->forEachAtom(handler);
 649                                         }
 650                                 }
 651                                 else {
 652                                         throwf("linker option dylib at %s is not a dylib", info.path);
 653                                 }
 654                         }
 655                         catch (const char* msg) {
 656                                 warning("Auto-Linking supplied '%s', %s", info.path, msg);
 657                         }
 658                 }
 659         }
 660 }
 661
 662 void InputFiles::createIndirectDylibs()
 663 {
 664         // keep processing dylibs until no more dylibs are added
 665         unsigned long lastMapSize = 0;
 666         std::set<ld::dylib::File*>  dylibsProcessed;
 667         while ( lastMapSize != _allDylibs.size() ) {
 668                 lastMapSize = _allDylibs.size();
 669                 // can't iterator _installPathToDylibs while modifying it, so use temp buffer
 670                 std::vector<ld::dylib::File*> unprocessedDylibs;
 671                 for (std::set<ld::dylib::File*>::iterator it=_allDylibs.begin(); it != _allDylibs.end(); it++) {
 672                         if ( dylibsProcessed.count(*it) == 0 )
 673                                 unprocessedDylibs.push_back(*it);
 674                 }
 675                 for (std::vector<ld::dylib::File*>::iterator it=unprocessedDylibs.begin(); it != unprocessedDylibs.end(); it++) {
 676                         dylibsProcessed.insert(*it);
 677                         (*it)->processIndirectLibraries(this, _options.implicitlyLinkIndirectPublicDylibs());
 678                 }
 679         }
 680
 681         // go back over original dylibs and mark sub frameworks as re-exported
 682         if ( _options.outputKind() == Options::kDynamicLibrary ) {
 683                 const char* myLeaf = strrchr(_options.installPath(), '/');
 684                 if ( myLeaf != NULL ) {
 685                         for (std::vector<class ld::File*>::const_iterator it=_inputFiles.begin(); it != _inputFiles.end(); it++) {
 686                                 ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(*it);
 687                                 if ( dylibReader != NULL ) {
 688                                         const char* childParent = dylibReader->parentUmbrella();
 689                                         if ( childParent != NULL ) {
 690                                                 if ( strcmp(childParent, &myLeaf[1]) == 0 ) {
 691                                                         // mark that this dylib will be re-exported
 692                                                         dylibReader->setWillBeReExported();
 693                                                 }
 694                                         }
 695                                 }
 696                         }
 697                 }
 698         }
 699
 700 }
 701
 702 void InputFiles::createOpaqueFileSections()
 703 {
 704         // extra command line sections always at end
 705         for (Options::ExtraSection::const_iterator it=_options.extraSectionsBegin(); it != _options.extraSectionsEnd(); ++it) {
 706                 _inputFiles.push_back(opaque_section::parse(it->segmentName, it->sectionName, it->path, it->data, it->dataLen));
 707                 if ( _options.dumpDependencyInfo() )
 708                         _options.dumpDependency(Options::depSection, it->path);
 709         }
 710
 711 }
 712
 713
 714 void InputFiles::checkDylibClientRestrictions(ld::dylib::File* dylib)
 715 {
 716         // Check for any restrictions on who can link with this dylib
 717         const char* dylibParentName = dylib->parentUmbrella() ;
 718         const std::vector<const char*>* clients = dylib->allowableClients();
 719         if ( (dylibParentName != NULL) || (clients != NULL) ) {
 720                 // only dylibs that are in an umbrella or have a client list need verification
 721                 const char* installName = _options.installPath();
 722                 const char* installNameLastSlash = strrchr(installName, '/');
 723                 bool isParent = false;
 724                 bool isSibling = false;
 725                 bool isAllowableClient = false;
 726                 // There are three cases:
 727                 if ( (dylibParentName != NULL) && (installNameLastSlash != NULL) ) {
 728                         // starts after last slash
 729                         const char* myName = &installNameLastSlash[1];
 730                         unsigned int myNameLen = strlen(myName);
 731                         if ( strncmp(myName, "lib", 3) == 0 )
 732                                 myName = &myName[3];
 733                         // up to first dot
 734                         const char* firstDot = strchr(myName, '.');
 735                         if ( firstDot != NULL )
 736                                 myNameLen = firstDot - myName;
 737                         // up to first underscore
 738                         const char* firstUnderscore = strchr(myName, '_');
 739                         if ( (firstUnderscore != NULL) && ((firstUnderscore - myName) < (int)myNameLen) )
 740                                 myNameLen = firstUnderscore - myName;
 741
 742                         // case 1) The dylib has a parent umbrella, and we are creating the parent umbrella
 743                         isParent = ( (strlen(dylibParentName) == myNameLen) && (strncmp(myName, dylibParentName, myNameLen) == 0) );
 744
 745                         // case 2) The dylib has a parent umbrella, and we are creating a sibling with the same parent
 746                         isSibling = ( (_options.umbrellaName() != NULL) && (strcmp(_options.umbrellaName(), dylibParentName) == 0) );
 747                 }
 748
 749                 if ( !isParent && !isSibling && (clients != NULL) ) {
 750                         // case 3) the dylib has a list of allowable clients, and we are creating one of them
 751                         const char* clientName = _options.clientName();
 752                         int clientNameLen = 0;
 753                         if ( clientName != NULL ) {
 754                                 // use client name as specified on command line
 755                                 clientNameLen = strlen(clientName);
 756                         }
 757                         else {
 758                                 // infer client name from output path (e.g. xxx/libfoo_variant.A.dylib --> foo, Bar.framework/Bar_variant --> Bar)
 759                                 clientName = installName;
 760                                 clientNameLen = strlen(clientName);
 761                                 // starts after last slash
 762                                 if ( installNameLastSlash != NULL )
 763                                         clientName = &installNameLastSlash[1];
 764                                 if ( strncmp(clientName, "lib", 3) == 0 )
 765                                         clientName = &clientName[3];
 766                                 // up to first dot
 767                                 const char* firstDot = strchr(clientName, '.');
 768                                 if ( firstDot != NULL )
 769                                         clientNameLen = firstDot - clientName;
 770                                 // up to first underscore
 771                                 const char* firstUnderscore = strchr(clientName, '_');
 772                                 if ( (firstUnderscore != NULL) && ((firstUnderscore - clientName) < clientNameLen) )
 773                                         clientNameLen = firstUnderscore - clientName;
 774                         }
 775
 776                         // Use clientName to check if this dylib is able to link against the allowable clients.
 777                         for (std::vector<const char*>::const_iterator it = clients->begin(); it != clients->end(); it++) {
 778                                 if ( strncmp(*it, clientName, clientNameLen) == 0 )
 779                                         isAllowableClient = true;
 780                         }
 781                 }
 782
 783                 if ( !isParent && !isSibling && !isAllowableClient ) {
 784                         if ( dylibParentName != NULL ) {
 785                                 throwf("cannot link directly with %s.  Link against the umbrella framework '%s.framework' instead.",
 786                                         dylib->path(), dylibParentName);
 787                         }
 788                         else {
 789                                 throwf("cannot link directly with %s", dylib->path());
 790                         }
 791                 }
 792         }
 793 }
 794
 795
 796 void InputFiles::inferArchitecture(Options& opts, const char** archName)
 797 {
 798         _inferredArch = true;
 799         // scan all input files, looking for a thin .o file.
 800         // the first one found is presumably the architecture to link
 801         uint8_t buffer[4096];
 802         const std::vector<Options::FileInfo>& files = opts.getInputFiles();
 803         for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
 804                 int fd = ::open(it->path, O_RDONLY, 0);
 805                 if ( fd != -1 ) {
 806                         struct stat stat_buf;
 807                         if ( fstat(fd, &stat_buf) != -1) {
 808                                 ssize_t readAmount = stat_buf.st_size;
 809                                 if ( 4096 < readAmount )
 810                                         readAmount = 4096;
 811                                 ssize_t amount = read(fd, buffer, readAmount);
 812                                 ::close(fd);
 813                                 if ( amount >= readAmount ) {
 814                                         cpu_type_t type;
 815                                         cpu_subtype_t subtype;
 816                                         Options::Platform platform;
 817                                         if ( mach_o::relocatable::isObjectFile(buffer, &type, &subtype, &platform) ) {
 818                                                 opts.setArchitecture(type, subtype, platform);
 819                                                 *archName = opts.architectureName();
 820                                                 return;
 821                                         }
 822                                 }
 823                         }
 824                 }
 825         }
 826
 827         // no thin .o files found, so default to same architecture this tool was built as
 828         warning("-arch not specified");
 829 #if __i386__
 830         opts.setArchitecture(CPU_TYPE_I386, CPU_SUBTYPE_X86_ALL, Options::kPlatformOSX);
 831 #elif __x86_64__
 832         opts.setArchitecture(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL, Options::kPlatformOSX);
 833 #elif __arm__
 834         opts.setArchitecture(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6, Options::kPlatformOSX);
 835 #else
 836         #error unknown default architecture
 837 #endif
 838         *archName = opts.architectureName();
 839 }
 840
 841
 842 InputFiles::InputFiles(Options& opts, const char** archName)
 843  : _totalObjectSize(0), _totalArchiveSize(0),
 844    _totalObjectLoaded(0), _totalArchivesLoaded(0), _totalDylibsLoaded(0),
 845         _options(opts), _bundleLoader(NULL),
 846         _inferredArch(false),
 847         _exception(NULL),
 848         _indirectDylibOrdinal(ld::File::Ordinal::indirectDylibBase()),
 849         _linkerOptionOrdinal(ld::File::Ordinal::linkeOptionBase())
 850 {
 851 //      fStartCreateReadersTime = mach_absolute_time();
 852         if ( opts.architecture() == 0 ) {
 853                 // command line missing -arch, so guess arch
 854                 inferArchitecture(opts, archName);
 855         }
 856 #if HAVE_PTHREADS
 857         pthread_mutex_init(&_parseLock, NULL);
 858         pthread_cond_init(&_parseWorkReady, NULL);
 859         pthread_cond_init(&_newFileAvailable, NULL);
 860 #endif
 861         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
 862         if ( files.size() == 0 )
 863                 throw "no object files specified";
 864
 865         _inputFiles.reserve(files.size());
 866 #if HAVE_PTHREADS
 867         unsigned int inputFileSlot = 0;
 868         _availableInputFiles = 0;
 869         _parseCursor = 0;
 870 #endif
 871         Options::FileInfo* entry;
 872         for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
 873                 entry = (Options::FileInfo*)&(*it);
 874 #if HAVE_PTHREADS
 875                 // Assign input file slots to all the FileInfos.
 876                 // Also chain all FileInfos into one big list to set up for worker threads to do parsing.
 877                 entry->inputFileSlot = inputFileSlot;
 878                 entry->readyToParse = !entry->fromFileList || !_options.pipelineEnabled();
 879                 if (entry->readyToParse)
 880                         _availableInputFiles++;
 881                 _inputFiles.push_back(NULL);
 882                 inputFileSlot++;
 883 #else
 884                 // In the non-threaded case just parse the file now.
 885                 _inputFiles.push_back(makeFile(*entry, false));
 886 #endif
 887         }
 888
 889 #if HAVE_PTHREADS
 890         _remainingInputFiles = files.size();
 891
 892         // initialize info for parsing input files on worker threads
 893         unsigned int ncpus;
 894         int mib[2];
 895         size_t len = sizeof(ncpus);
 896         mib[0] = CTL_HW;
 897         mib[1] = HW_NCPU;
 898         if (sysctl(mib, 2, &ncpus, &len, NULL, 0) != 0) {
 899                 ncpus = 1;
 900         }
 901         _availableWorkers = MIN(ncpus, files.size()); // max # workers we permit
 902         _idleWorkers = 0;
 903
 904         if (_options.pipelineEnabled()) {
 905                 // start up a thread to listen for available input files
 906                 startThread(InputFiles::waitForInputFiles);
 907         }
 908
 909         // Start up one parser thread. More start on demand as parsed input files get consumed.
 910         startThread(InputFiles::parseWorkerThread);
 911         _availableWorkers--;
 912 #else
 913         if (_options.pipelineEnabled()) {
 914                 throwf("pipelined linking not supported on this platform");
 915         }
 916 #endif
 917 }
 918
 919
 920 #if HAVE_PTHREADS
 921 void InputFiles::startThread(void (*threadFunc)(InputFiles *)) const {
 922         pthread_t thread;
 923         pthread_attr_t attr;
 924         pthread_attr_init(&attr);
 925         // set a nice big stack (same as main thread) because some code uses potentially large stack buffers
 926         pthread_attr_setstacksize(&attr, 8 * 1024 * 1024);
 927         pthread_create(&thread, &attr, (void *(*)(void*))threadFunc, (void *)this);
 928         pthread_detach(thread);
 929         pthread_attr_destroy(&attr);
 930 }
 931
 932 // Work loop for input file parsing threads
 933 void InputFiles::parseWorkerThread() {
 934         ld::File *file;
 935         const char *exception = NULL;
 936         pthread_mutex_lock(&_parseLock);
 937         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
 938         if (_s_logPThreads) printf("worker starting\n");
 939         do {
 940                 if (_availableInputFiles == 0) {
 941                         _idleWorkers++;
 942                         pthread_cond_wait(&_parseWorkReady, &_parseLock);
 943                         _idleWorkers--;
 944                 } else {
 945                         int slot = _parseCursor;
 946                         while (slot < (int)files.size() && (_inputFiles[slot] != NULL || !files[slot].readyToParse))
 947                                 slot++;
 948                         assert(slot < (int)files.size());
 949                         Options::FileInfo& entry = (Options::FileInfo&)files[slot];
 950                         _parseCursor = slot+1;
 951                         _availableInputFiles--;
 952                         entry.readyToParse = false; // to avoid multiple threads finding this file
 953                         pthread_mutex_unlock(&_parseLock);
 954                         if (_s_logPThreads) printf("parsing index %u\n", slot);
 955                         try {
 956                                 file = makeFile(entry, false);
 957                         }
 958                         catch (const char *msg) {
 959                                 if ( (strstr(msg, "architecture") != NULL) && !_options.errorOnOtherArchFiles() ) {
 960                                         if ( _options.ignoreOtherArchInputFiles() ) {
 961                                                 // ignore, because this is about an architecture not in use
 962                                         }
 963                                         else {
 964                                                 warning("ignoring file %s, %s", entry.path, msg);
 965                                         }
 966                                 }
 967                                 else if ( strstr(msg, "ignoring unexpected") != NULL ) {
 968                                         warning("%s, %s", entry.path, msg);
 969                                 }
 970                                 else {
 971                                         asprintf((char**)&exception, "%s file '%s'", msg, entry.path);
 972                                 }
 973                                 file = new IgnoredFile(entry.path, entry.modTime, entry.ordinal, ld::File::Other);
 974                         }
 975                         pthread_mutex_lock(&_parseLock);
 976                         if (_remainingInputFiles > 0)
 977                                 _remainingInputFiles--;
 978                         if (_s_logPThreads) printf("done with index %u, %d remaining\n", slot, _remainingInputFiles);
 979                         if (exception) {
 980                                 // We are about to die, so set to zero to stop other threads from doing unneeded work.
 981                                 _remainingInputFiles = 0;
 982                                 _exception = exception;
 983                         }
 984                         else {
 985                                 _inputFiles[slot] = file;
 986                                 if (_neededFileSlot == slot)
 987                                         pthread_cond_signal(&_newFileAvailable);
 988                         }
 989                 }
 990         } while (_remainingInputFiles);
 991         if (_s_logPThreads) printf("worker exiting\n");
 992         pthread_cond_broadcast(&_parseWorkReady);
 993         pthread_cond_signal(&_newFileAvailable);
 994         pthread_mutex_unlock(&_parseLock);
 995 }
 996
 997
 998 void InputFiles::parseWorkerThread(InputFiles *inputFiles) {
 999         inputFiles->parseWorkerThread();
1000 }
1001 #endif
1002
1003
1004 ld::File* InputFiles::addDylib(ld::dylib::File* reader, const Options::FileInfo& info)
1005 {
1006         _allDylibs.insert(reader);
1007
1008         if ( (reader->installPath() == NULL) && !info.options.fBundleLoader ) {
1009                 // this is a "blank" stub
1010                 // silently ignore it
1011                 return reader;
1012         }
1013         // store options about how dylib will be used in dylib itself
1014         if ( info.options.fWeakImport )
1015                 reader->setForcedWeakLinked();
1016         if ( info.options.fReExport )
1017                 reader->setWillBeReExported();
1018         if ( info.options.fUpward ) {
1019                 if ( _options.outputKind() == Options::kDynamicLibrary )
1020                         reader->setWillBeUpwardDylib();
1021                 else
1022                         warning("ignoring upward dylib option for %s\n", info.path);
1023         }
1024         if ( info.options.fLazyLoad )
1025                 reader->setWillBeLazyLoadedDylb();
1026
1027         // add to map of loaded dylibs
1028         const char* installPath = reader->installPath();
1029         if ( installPath != NULL ) {
1030                 InstallNameToDylib::iterator pos = _installPathToDylibs.find(installPath);
1031                 if ( pos == _installPathToDylibs.end() ) {
1032                         _installPathToDylibs[strdup(installPath)] = reader;
1033                 }
1034                 else {
1035                         bool dylibOnCommandLineTwice = ( strcmp(pos->second->path(), reader->path()) == 0 );
1036                         bool isSymlink = false;
1037                         // ignore if this is a symlink to a dylib we've already loaded
1038                         if ( !dylibOnCommandLineTwice ) {
1039                                 char existingDylibPath[PATH_MAX];
1040                                 if ( realpath(pos->second->path(), existingDylibPath) != NULL ) {
1041                                         char newDylibPath[PATH_MAX];
1042                                         if ( realpath(reader->path(), newDylibPath) != NULL ) {
1043                                                 isSymlink = ( strcmp(existingDylibPath, newDylibPath) == 0 );
1044                                         }
1045                                 }
1046                         }
1047                         // remove warning for <rdar://problem/10860629> Same install name for CoreServices and CFNetwork?
1048                         //if ( !dylibOnCommandLineTwice && !isSymlink )
1049                         //      warning("dylibs with same install name: %p %s and %p %s", pos->second, pos->second->path(), reader, reader->path());
1050                 }
1051         }
1052         else if ( info.options.fBundleLoader )
1053                 _bundleLoader = reader;
1054
1055         // log direct readers
1056         if ( ! info.options.fIndirectDylib )
1057                 this->logDylib(reader, false);
1058
1059         // update stats
1060         _totalDylibsLoaded++;
1061
1062         // just add direct libraries to search-first list
1063         if ( ! info.options.fIndirectDylib )
1064                 _searchLibraries.push_back(LibraryInfo(reader));
1065
1066         return reader;
1067 }
1068
1069
1070 #if HAVE_PTHREADS
1071 // Called during pipelined linking to listen for available input files.
1072 // Available files are enqueued for parsing.
1073 void InputFiles::waitForInputFiles()
1074 {
1075         if (_s_logPThreads) printf("starting pipeline listener\n");
1076         try {
1077                 const char *fifo = _options.pipelineFifo();
1078                 assert(fifo);
1079                 std::map<const char *, const Options::FileInfo*, strcompclass> fileMap;
1080                 const std::vector<Options::FileInfo>& files = _options.getInputFiles();
1081                 for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
1082                         const Options::FileInfo& entry = *it;
1083                         if (entry.fromFileList) {
1084                                 fileMap[entry.path] = &entry;
1085                         }
1086                 }
1087                 FILE *fileStream = fopen(fifo, "r");
1088                 if (!fileStream)
1089                         throwf("pipelined linking error - failed to open stream. fopen() returns %s for \"%s\"\n", strerror(errno), fifo);
1090                 while (fileMap.size() > 0) {
1091                         char path_buf[PATH_MAX+1];
1092                         if (fgets(path_buf, PATH_MAX, fileStream) == NULL)
1093                                 throwf("pipelined linking error - %lu missing input files", fileMap.size());
1094                         int len = strlen(path_buf);
1095                         if (path_buf[len-1] == '\n')
1096                                 path_buf[len-1] = 0;
1097                         std::map<const char *, const Options::FileInfo*, strcompclass>::iterator it = fileMap.find(path_buf);
1098                         if (it == fileMap.end())
1099                                 throwf("pipelined linking error - not in file list: %s\n", path_buf);
1100                         Options::FileInfo* inputInfo = (Options::FileInfo*)it->second;
1101                         if (!inputInfo->checkFileExists(_options))
1102                                 throwf("pipelined linking error - file does not exist: %s\n", inputInfo->path);
1103                         pthread_mutex_lock(&_parseLock);
1104                         if (_idleWorkers)
1105                                 pthread_cond_signal(&_parseWorkReady);
1106                         inputInfo->readyToParse = true;
1107                         if (_parseCursor > inputInfo->inputFileSlot)
1108                                 _parseCursor = inputInfo->inputFileSlot;
1109                         _availableInputFiles++;
1110                         if (_s_logPThreads) printf("pipeline listener: %s slot=%d, _parseCursor=%d, _availableInputFiles = %d remaining = %ld\n", path_buf, inputInfo->inputFileSlot, _parseCursor, _availableInputFiles, fileMap.size()-1);
1111                         pthread_mutex_unlock(&_parseLock);
1112                         fileMap.erase(it);
1113                 }
1114         } catch (const char *msg) {
1115                 pthread_mutex_lock(&_parseLock);
1116                 _exception = msg;
1117                 pthread_cond_signal(&_newFileAvailable);
1118                 pthread_mutex_unlock(&_parseLock);
1119         }
1120 }
1121
1122
1123 void InputFiles::waitForInputFiles(InputFiles *inputFiles) {
1124         inputFiles->waitForInputFiles();
1125 }
1126 #endif
1127
1128
1129 void InputFiles::forEachInitialAtom(ld::File::AtomHandler& handler, ld::Internal& state)
1130 {
1131         // add all direct object, archives, and dylibs
1132         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
1133         size_t fileIndex;
1134         for (fileIndex=0; fileIndex<_inputFiles.size(); fileIndex++) {
1135                 ld::File *file;
1136 #if HAVE_PTHREADS
1137                 pthread_mutex_lock(&_parseLock);
1138
1139                 // this loop waits for the needed file to be ready (parsed by worker thread)
1140                 while (_inputFiles[fileIndex] == NULL && _exception == NULL) {
1141                         // We are starved for input. If there are still files to parse and we have
1142                         // not maxed out the worker thread count start a new worker thread.
1143                         if (_availableInputFiles > 0 && _availableWorkers > 0) {
1144                                 if (_s_logPThreads) printf("starting worker\n");
1145                                 startThread(InputFiles::parseWorkerThread);
1146                                 _availableWorkers--;
1147                         }
1148                         _neededFileSlot = fileIndex;
1149                         if (_s_logPThreads) printf("consumer blocking for %lu: %s\n", fileIndex, files[fileIndex].path);
1150                         pthread_cond_wait(&_newFileAvailable, &_parseLock);
1151                 }
1152
1153                 if (_exception)
1154                         throw _exception;
1155
1156                 // The input file is parsed. Assimilate it and call its atom iterator.
1157                 if (_s_logPThreads) printf("consuming slot %lu\n", fileIndex);
1158                 file = _inputFiles[fileIndex];
1159                 pthread_mutex_unlock(&_parseLock);
1160 #else
1161                 file = _inputFiles[fileIndex];
1162 #endif
1163                 const Options::FileInfo& info = files[fileIndex];
1164                 switch (file->type()) {
1165                         case ld::File::Reloc:
1166                         {
1167                                 ld::relocatable::File* reloc = (ld::relocatable::File*)file;
1168                                 _options.snapshot().recordObjectFile(reloc->path());
1169                                 if ( _options.dumpDependencyInfo() )
1170                                         _options.dumpDependency(Options::depObjectFile, reloc->path());
1171                         }
1172                                 break;
1173                         case ld::File::Dylib:
1174                         {
1175                                 ld::dylib::File* dylib = (ld::dylib::File*)file;
1176                                 addDylib(dylib, info);
1177                         }
1178                                 break;
1179                         case ld::File::Archive:
1180                         {
1181                                 ld::archive::File* archive = (ld::archive::File*)file;
1182                                 // <rdar://problem/9740166> force loaded archives should be in LD_TRACE
1183                                 if ( (info.options.fForceLoad || _options.fullyLoadArchives()) && _options.traceArchives() )
1184                                         logArchive(archive);
1185                                 _searchLibraries.push_back(LibraryInfo(archive));
1186                                 if ( _options.dumpDependencyInfo() )
1187                                         _options.dumpDependency(Options::depArchive, archive->path());
1188                         }
1189                                 break;
1190                         case ld::File::Other:
1191                                 break;
1192                         default:
1193                         {
1194                                 throwf("Unknown file type for %s", file->path());
1195                         }
1196                                 break;
1197                 }
1198                 file->forEachAtom(handler);
1199         }
1200
1201         markExplicitlyLinkedDylibs();
1202         addLinkerOptionLibraries(state, handler);
1203         createIndirectDylibs();
1204         createOpaqueFileSections();
1205
1206         while (fileIndex < _inputFiles.size()) {
1207                 ld::File *file = _inputFiles[fileIndex];
1208                 file->forEachAtom(handler);
1209                 fileIndex++;
1210         }
1211
1212     switch ( _options.outputKind() ) {
1213         case Options::kStaticExecutable:
1214         case Options::kDynamicExecutable:
1215             // add implicit __dso_handle label
1216             handler.doAtom(DSOHandleAtom::_s_atomExecutable);
1217             handler.doAtom(DSOHandleAtom::_s_atomAll);
1218             if ( _options.pageZeroSize() != 0 )
1219                 handler.doAtom(*new PageZeroAtom(_options.pageZeroSize()));
1220             if ( _options.hasCustomStack() && !_options.needsEntryPointLoadCommand() )
1221                 handler.doAtom(*new CustomStackAtom(_options.customStackSize()));
1222             break;
1223         case Options::kDynamicLibrary:
1224             // add implicit __dso_handle label
1225             handler.doAtom(DSOHandleAtom::_s_atomDylib);
1226             handler.doAtom(DSOHandleAtom::_s_atomAll);
1227             break;
1228         case Options::kDynamicBundle:
1229             // add implicit __dso_handle label
1230             handler.doAtom(DSOHandleAtom::_s_atomBundle);
1231             handler.doAtom(DSOHandleAtom::_s_atomAll);
1232             break;
1233         case Options::kDyld:
1234             // add implicit __dso_handle label
1235             handler.doAtom(DSOHandleAtom::_s_atomDyld);
1236             handler.doAtom(DSOHandleAtom::_s_atomAll);
1237             break;
1238         case Options::kPreload:
1239             // add implicit __mh_preload_header label
1240             handler.doAtom(DSOHandleAtom::_s_atomPreload);
1241             // add implicit __dso_handle label, but put it in __text section because
1242             // with -preload the mach_header is no in the address space.
1243             handler.doAtom(DSOHandleAtom::_s_atomPreloadDSO);
1244             break;
1245         case Options::kObjectFile:
1246             handler.doAtom(DSOHandleAtom::_s_atomObjectFile);
1247             break;
1248         case Options::kKextBundle:
1249             // add implicit __dso_handle label
1250             handler.doAtom(DSOHandleAtom::_s_atomAll);
1251             break;
1252         }
1253 }
1254
1255
1256 bool InputFiles::searchLibraries(const char* name, bool searchDylibs, bool searchArchives, bool dataSymbolOnly, ld::File::AtomHandler& handler) const
1257 {
1258         // Check each input library.
1259     for (std::vector<LibraryInfo>::const_iterator it=_searchLibraries.begin(); it != _searchLibraries.end(); ++it) {
1260         LibraryInfo lib = *it;
1261         if (lib.isDylib()) {
1262             if (searchDylibs) {
1263                 ld::dylib::File *dylibFile = lib.dylib();
1264                 //fprintf(stderr, "searchLibraries(%s), looking in linked %s\n", name, dylibFile->path() );
1265                 if ( dylibFile->justInTimeforEachAtom(name, handler) ) {
1266                     // we found a definition in this dylib
1267                     // done, unless it is a weak definition in which case we keep searching
1268                     _options.snapshot().recordDylibSymbol(dylibFile, name);
1269                     if ( !dylibFile->hasWeakExternals() || !dylibFile->hasWeakDefinition(name)) {
1270                         return true;
1271                     }
1272                     // else continue search for a non-weak definition
1273                 }
1274             }
1275         } else {
1276             if (searchArchives) {
1277                 ld::archive::File *archiveFile = lib.archive();
1278                 if ( dataSymbolOnly ) {
1279                     if ( archiveFile->justInTimeDataOnlyforEachAtom(name, handler) ) {
1280                         if ( _options.traceArchives() )
1281                             logArchive(archiveFile);
1282                         _options.snapshot().recordArchive(archiveFile->path());
1283                         // found data definition in static library, done
1284                        return true;
1285                     }
1286                 }
1287                 else {
1288                     if ( archiveFile->justInTimeforEachAtom(name, handler) ) {
1289                         if ( _options.traceArchives() )
1290                             logArchive(archiveFile);
1291                         _options.snapshot().recordArchive(archiveFile->path());
1292                         // found definition in static library, done
1293                         return true;
1294                     }
1295                 }
1296             }
1297         }
1298     }
1299
1300         // search indirect dylibs
1301         if ( searchDylibs ) {
1302                 for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1303                         ld::dylib::File* dylibFile = it->second;
1304                         bool searchThisDylib = false;
1305                         if ( _options.nameSpace() == Options::kTwoLevelNameSpace ) {
1306                                 // for two level namesapce, just check all implicitly linked dylibs
1307                                 searchThisDylib = dylibFile->implicitlyLinked() && !dylibFile->explicitlyLinked();
1308                         }
1309                         else {
1310                                 // for flat namespace, check all indirect dylibs
1311                                 searchThisDylib = ! dylibFile->explicitlyLinked();
1312                         }
1313                         if ( searchThisDylib ) {
1314                                 //fprintf(stderr, "searchLibraries(%s), looking in implicitly linked %s\n", name, dylibFile->path() );
1315                                 if ( dylibFile->justInTimeforEachAtom(name, handler) ) {
1316                                         // we found a definition in this dylib
1317                                         // done, unless it is a weak definition in which case we keep searching
1318                     _options.snapshot().recordDylibSymbol(dylibFile, name);
1319                                         if ( !dylibFile->hasWeakExternals() || !dylibFile->hasWeakDefinition(name)) {
1320                                                 return true;
1321                     }
1322                                         // else continue search for a non-weak definition
1323                                 }
1324                         }
1325                 }
1326         }
1327
1328         return false;
1329 }
1330
1331
1332 bool InputFiles::searchWeakDefInDylib(const char* name) const
1333 {
1334         // search all relevant dylibs to see if any have a weak-def with this name
1335         for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1336                 ld::dylib::File* dylibFile = it->second;
1337                 if ( dylibFile->implicitlyLinked() || dylibFile->explicitlyLinked() ) {
1338                         if ( dylibFile->hasWeakExternals() && dylibFile->hasWeakDefinition(name) ) {
1339                                 return true;
1340                         }
1341                 }
1342         }
1343         return false;
1344 }
1345
1346 static bool vectorContains(const std::vector<ld::dylib::File*>& vec, ld::dylib::File* key)
1347 {
1348         return std::find(vec.begin(), vec.end(), key) != vec.end();
1349 }
1350
1351 struct DylibByInstallNameSorter
1352 {
1353          bool operator()(const ld::dylib::File* left, const ld::dylib::File* right)
1354          {
1355           return (strcmp(left->installPath(), right->installPath()) < 0);
1356          }
1357 };
1358
1359 void InputFiles::dylibs(ld::Internal& state)
1360 {
1361         bool dylibsOK = false;
1362         switch ( _options.outputKind() ) {
1363                 case Options::kDynamicExecutable:
1364                 case Options::kDynamicLibrary:
1365                 case Options::kDynamicBundle:
1366                         dylibsOK = true;
1367                         break;
1368                 case Options::kStaticExecutable:
1369                 case Options::kDyld:
1370                 case Options::kPreload:
1371                 case Options::kObjectFile:
1372                 case Options::kKextBundle:
1373                         dylibsOK = false;
1374                         break;
1375         }
1376
1377         // add command line dylibs in order
1378         for (std::vector<ld::File*>::const_iterator it=_inputFiles.begin(); it != _inputFiles.end(); ++it) {
1379                 ld::dylib::File* dylibFile = dynamic_cast<ld::dylib::File*>(*it);
1380                 // only add dylibs that are not "blank" dylib stubs
1381                 if ( (dylibFile != NULL) && ((dylibFile->installPath() != NULL) || (dylibFile == _bundleLoader)) ) {
1382                         if ( dylibsOK ) {
1383                                 if ( ! vectorContains(state.dylibs, dylibFile) ) {
1384                                         state.dylibs.push_back(dylibFile);
1385                                 }
1386                         }
1387                         else
1388                                 warning("unexpected dylib (%s) on link line", dylibFile->path());
1389                 }
1390         }
1391         // add implicitly linked dylibs
1392         if ( _options.nameSpace() == Options::kTwoLevelNameSpace ) {
1393                 std::vector<ld::dylib::File*> implicitDylibs;
1394                 for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1395                         ld::dylib::File* dylibFile = it->second;
1396                         if ( dylibFile->implicitlyLinked() && dylibsOK ) {
1397                                 if ( ! vectorContains(implicitDylibs, dylibFile) ) {
1398                                         implicitDylibs.push_back(dylibFile);
1399                                 }
1400                         }
1401                 }
1402                 // <rdar://problem/15002251> make implicit dylib order be deterministic by sorting by install_name
1403                 std::sort(implicitDylibs.begin(), implicitDylibs.end(), DylibByInstallNameSorter());
1404                 state.dylibs.insert(state.dylibs.end(), implicitDylibs.begin(), implicitDylibs.end());
1405         }
1406
1407         //fprintf(stderr, "all dylibs:\n");
1408         //for(std::vector<ld::dylib::File*>::iterator it=state.dylibs.begin(); it != state.dylibs.end(); ++it) {
1409         //      const ld::dylib::File* dylib = *it;
1410         //      fprintf(stderr, "    %p %s\n", dylib, dylib->path());
1411         //}
1412
1413         // and -bundle_loader
1414         state.bundleLoader = _bundleLoader;
1415
1416         // <rdar://problem/10807040> give an error when -nostdlib is used and libSystem is missing
1417         if ( (state.dylibs.size() == 0) && _options.needsEntryPointLoadCommand() )
1418                 throw "dynamic main executables must link with libSystem.dylib";
1419 }
1420
1421
1422 } // namespace tool
1423 } // namespace ld
1424