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         // workaround for strip -S
 304         // when ld -r has single input file, set the srcKind to kSourceSingle so __LLVM segment will be kept
 305         if (_options.outputKind() == Options::kObjectFile && _options.getInputFiles().size() == 1)
 306                 objOpts.srcKind                 = ld::relocatable::File::kSourceSingle;
 307         else
 308                 objOpts.srcKind                         = ld::relocatable::File::kSourceObj;
 309         ld::relocatable::File* objResult = mach_o::relocatable::parse(p, len, info.path, info.modTime, info.ordinal, objOpts);
 310         if ( objResult != NULL ) {
 311                 OSAtomicAdd64(len, &_totalObjectSize);
 312                 OSAtomicIncrement32(&_totalObjectLoaded);
 313                 return objResult;
 314         }
 315
 316         // see if it is an llvm object file
 317         objResult = lto::parse(p, len, info.path, info.modTime, info.ordinal, _options.architecture(), _options.subArchitecture(), _options.logAllFiles(), _options.verboseOptimizationHints());
 318         if ( objResult != NULL ) {
 319                 OSAtomicAdd64(len, &_totalObjectSize);
 320                 OSAtomicIncrement32(&_totalObjectLoaded);
 321                 return objResult;
 322         }
 323
 324         // see if it is a dynamic library (or text-based dynamic library)
 325         ld::dylib::File* dylibResult;
 326         bool dylibsNotAllowed = false;
 327         switch ( _options.outputKind() ) {
 328                 case Options::kDynamicExecutable:
 329                 case Options::kDynamicLibrary:
 330                 case Options::kDynamicBundle:
 331                         dylibResult = mach_o::dylib::parse(p, len, info.path, info.modTime, _options, info.ordinal, info.options.fBundleLoader, indirectDylib);
 332                         if ( dylibResult != NULL ) {
 333                                 return dylibResult;
 334                         }
 335                         dylibResult = textstub::dylib::parse(p, len, info.path, info.modTime, _options, info.ordinal, info.options.fBundleLoader, indirectDylib);
 336                         if ( dylibResult != NULL ) {
 337                                 return dylibResult;
 338                         }
 339                         break;
 340                 case Options::kStaticExecutable:
 341                 case Options::kDyld:
 342                 case Options::kPreload:
 343                 case Options::kObjectFile:
 344                 case Options::kKextBundle:
 345                         dylibsNotAllowed = true;
 346                         break;
 347         }
 348
 349         // see if it is a static library
 350         ::archive::ParserOptions archOpts;
 351         archOpts.objOpts                                = objOpts;
 352         archOpts.forceLoadThisArchive   = info.options.fForceLoad;
 353         archOpts.forceLoadAll                   = _options.fullyLoadArchives();
 354         archOpts.forceLoadObjC                  = _options.loadAllObjcObjectsFromArchives();
 355         archOpts.objcABI2                               = _options.objCABIVersion2POverride();
 356         archOpts.verboseLoad                    = _options.whyLoad();
 357         archOpts.logAllFiles                    = _options.logAllFiles();
 358         // Set ObjSource Kind, libclang_rt is compiler static library
 359         const char* libName = strrchr(info.path, '/');
 360         if ( (libName != NULL) && (strncmp(libName, "/libclang_rt", 12) == 0) )
 361                 archOpts.objOpts.srcKind = ld::relocatable::File::kSourceCompilerArchive;
 362         else
 363                 archOpts.objOpts.srcKind = ld::relocatable::File::kSourceArchive;
 364         ld::archive::File* archiveResult = ::archive::parse(p, len, info.path, info.modTime, info.ordinal, archOpts);
 365         if ( archiveResult != NULL ) {
 366                 OSAtomicAdd64(len, &_totalArchiveSize);
 367                 OSAtomicIncrement32(&_totalArchivesLoaded);
 368                 return archiveResult;
 369         }
 370
 371         // does not seem to be any valid linker input file, check LTO misconfiguration problems
 372         if ( lto::archName((uint8_t*)p, len) != NULL ) {
 373                 if ( lto::libLTOisLoaded() ) {
 374                         throwf("lto file was built for %s which is not the architecture being linked (%s): %s", fileArch(p, len), _options.architectureName(), info.path);
 375                 }
 376                 else {
 377                         const char* libLTO = "libLTO.dylib";
 378                         char ldPath[PATH_MAX];
 379                         char tmpPath[PATH_MAX];
 380                         char libLTOPath[PATH_MAX];
 381                         uint32_t bufSize = PATH_MAX;
 382                         if ( _options.overridePathlibLTO() != NULL ) {
 383                                 libLTO = _options.overridePathlibLTO();
 384                         }
 385                         else if ( _NSGetExecutablePath(ldPath, &bufSize) != -1 ) {
 386                                 if ( realpath(ldPath, tmpPath) != NULL ) {
 387                                         char* lastSlash = strrchr(tmpPath, '/');
 388                                         if ( lastSlash != NULL )
 389                                                 strcpy(lastSlash, "/../lib/libLTO.dylib");
 390                                         libLTO = tmpPath;
 391                                         if ( realpath(tmpPath, libLTOPath) != NULL )
 392                                                 libLTO = libLTOPath;
 393                                 }
 394                         }
 395                         throwf("could not process llvm bitcode object file, because %s could not be loaded", libLTO);
 396                 }
 397         }
 398
 399         if ( dylibsNotAllowed ) {
 400                 cpu_type_t dummy1;
 401                 cpu_type_t dummy2;
 402                 if ( mach_o::dylib::isDylibFile(p, &dummy1, &dummy2) )
 403                         throw "ignoring unexpected dylib file";
 404         }
 405
 406         // error handling
 407         if ( ((fat_header*)p)->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
 408                 throwf("missing required architecture %s in file %s (%u slices)", _options.architectureName(), info.path, sliceCount);
 409         }
 410         else {
 411                 if ( isFatFile )
 412                         throwf("file is universal (%u slices) but does not contain a(n) %s slice: %s", sliceCount, _options.architectureName(), info.path);
 413                 else
 414                         throwf("file was built for %s which is not the architecture being linked (%s): %s", fileArch(p, len), _options.architectureName(), info.path);
 415         }
 416 }
 417
 418 void InputFiles::logDylib(ld::File* file, bool indirect)
 419 {
 420         if ( _options.traceDylibs() ) {
 421                 const char* fullPath = file->path();
 422                 char realName[MAXPATHLEN];
 423                 if ( realpath(fullPath, realName) != NULL )
 424                         fullPath = realName;
 425                 const ld::dylib::File* dylib = dynamic_cast<const ld::dylib::File*>(file);
 426                 if ( (dylib != NULL ) && dylib->willBeUpwardDylib() ) {
 427                         // don't log upward dylibs when XBS is computing dependencies
 428                         logTraceInfo("[Logging for XBS] Used upward dynamic library: %s\n", fullPath);
 429                 }
 430                 else {
 431                         if ( indirect )
 432                                 logTraceInfo("[Logging for XBS] Used indirect dynamic library: %s\n", fullPath);
 433                         else
 434                                 logTraceInfo("[Logging for XBS] Used dynamic library: %s\n", fullPath);
 435                 }
 436         }
 437
 438         if ( _options.dumpDependencyInfo() ) {
 439                 const ld::dylib::File* dylib = dynamic_cast<const ld::dylib::File*>(file);
 440                 if ( file == _bundleLoader ) {
 441                         _options.dumpDependency(Options::depBundleLoader, file->path());
 442                 }
 443                 else if ( (dylib != NULL ) && dylib->willBeUpwardDylib() ) {
 444                         if ( indirect )
 445                                 _options.dumpDependency(Options::depUpwardIndirectDylib, file->path());
 446                         else
 447                                 _options.dumpDependency(Options::depUpwardDirectDylib, file->path());
 448                 }
 449                 else {
 450                         if ( indirect )
 451                                 _options.dumpDependency(Options::depIndirectDylib, file->path());
 452                         else
 453                                 _options.dumpDependency(Options::depDirectDylib, file->path());
 454                 }
 455         }
 456 }
 457
 458 void InputFiles::logArchive(ld::File* file) const
 459 {
 460         if ( _options.traceArchives() && (_archiveFilesLogged.count(file) == 0) ) {
 461                 // <rdar://problem/4947347> LD_TRACE_ARCHIVES should only print out when a .o is actually used from an archive
 462                 _archiveFilesLogged.insert(file);
 463                 const char* fullPath = file->path();
 464                 char realName[MAXPATHLEN];
 465                 if ( realpath(fullPath, realName) != NULL )
 466                         fullPath = realName;
 467                 logTraceInfo("[Logging for XBS] Used static archive: %s\n", fullPath);
 468         }
 469 }
 470
 471
 472 void InputFiles::logTraceInfo(const char* format, ...) const
 473 {
 474         // one time open() of custom LD_TRACE_FILE
 475         static int trace_file = -1;
 476         if ( trace_file == -1 ) {
 477                 const char *trace_file_path = _options.traceOutputFile();
 478                 if ( trace_file_path != NULL ) {
 479                         trace_file = open(trace_file_path, O_WRONLY | O_APPEND | O_CREAT, 0666);
 480                         if ( trace_file == -1 )
 481                                 throwf("Could not open or create trace file (errno=%d): %s", errno, trace_file_path);
 482                 }
 483                 else {
 484                         trace_file = fileno(stderr);
 485                 }
 486         }
 487
 488         char trace_buffer[MAXPATHLEN * 2];
 489     va_list ap;
 490         va_start(ap, format);
 491         int length = vsnprintf(trace_buffer, sizeof(trace_buffer), format, ap);
 492         va_end(ap);
 493         char* buffer_ptr = trace_buffer;
 494
 495         while (length > 0) {
 496                 ssize_t amount_written = write(trace_file, buffer_ptr, length);
 497                 if(amount_written == -1)
 498                         /* Failure to write shouldn't fail the build. */
 499                         return;
 500                 buffer_ptr += amount_written;
 501                 length -= amount_written;
 502         }
 503 }
 504
 505
 506 ld::dylib::File* InputFiles::findDylib(const char* installPath, const char* fromPath)
 507 {
 508         //fprintf(stderr, "findDylib(%s, %s)\n", installPath, fromPath);
 509         InstallNameToDylib::iterator pos = _installPathToDylibs.find(installPath);
 510         if ( pos != _installPathToDylibs.end() ) {
 511                 return pos->second;
 512         }
 513         else {
 514                 // allow -dylib_path option to override indirect library to use
 515                 for (std::vector<Options::DylibOverride>::const_iterator dit = _options.dylibOverrides().begin(); dit != _options.dylibOverrides().end(); ++dit) {
 516                         if ( strcmp(dit->installName,installPath) == 0 ) {
 517                                 try {
 518                                         Options::FileInfo info = _options.findFile(dit->useInstead);
 519                                         _indirectDylibOrdinal = _indirectDylibOrdinal.nextIndirectDylibOrdinal();
 520                                         info.ordinal = _indirectDylibOrdinal;
 521                                         info.options.fIndirectDylib = true;
 522                                         ld::File* reader = this->makeFile(info, true);
 523                                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 524                                         if ( dylibReader != NULL ) {
 525                                                 addDylib(dylibReader, info);
 526                                                 //_installPathToDylibs[strdup(installPath)] = dylibReader;
 527                                                 this->logDylib(dylibReader, true);
 528                                                 return dylibReader;
 529                                         }
 530                                         else
 531                                                 throwf("indirect dylib at %s is not a dylib", dit->useInstead);
 532                                 }
 533                                 catch (const char* msg) {
 534                                         warning("ignoring -dylib_file option, %s", msg);
 535                                 }
 536                         }
 537                 }
 538                 char newPath[MAXPATHLEN];
 539                 // handle @loader_path
 540                 if ( strncmp(installPath, "@loader_path/", 13) == 0 ) {
 541                         strcpy(newPath, fromPath);
 542                         char* addPoint = strrchr(newPath,'/');
 543                         if ( addPoint != NULL )
 544                                 strcpy(&addPoint[1], &installPath[13]);
 545                         else
 546                                 strcpy(newPath, &installPath[13]);
 547                         installPath = newPath;
 548                 }
 549                 // note: @executable_path case is handled inside findFileUsingPaths()
 550                 // search for dylib using -F and -L paths
 551                 Options::FileInfo info = _options.findFileUsingPaths(installPath);
 552                 _indirectDylibOrdinal = _indirectDylibOrdinal.nextIndirectDylibOrdinal();
 553                 info.ordinal = _indirectDylibOrdinal;
 554                 info.options.fIndirectDylib = true;
 555                 try {
 556                         ld::File* reader = this->makeFile(info, true);
 557                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 558                         if ( dylibReader != NULL ) {
 559                                 //assert(_installPathToDylibs.find(installPath) !=  _installPathToDylibs.end());
 560                                 //_installPathToDylibs[strdup(installPath)] = dylibReader;
 561                                 addDylib(dylibReader, info);
 562                                 this->logDylib(dylibReader, true);
 563                                 return dylibReader;
 564                         }
 565                         else
 566                                 throwf("indirect dylib at %s is not a dylib", info.path);
 567                 }
 568                 catch (const char* msg) {
 569                         throwf("in '%s', %s", info.path, msg);
 570                 }
 571         }
 572 }
 573
 574
 575 // mark all dylibs initially specified as required, and check if they can be used
 576 void InputFiles::markExplicitlyLinkedDylibs()
 577 {
 578         for (InstallNameToDylib::iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); it++) {
 579                 it->second->setExplicitlyLinked();
 580                 this->checkDylibClientRestrictions(it->second);
 581         }
 582 }
 583
 584 bool InputFiles::libraryAlreadyLoaded(const char* path)
 585 {
 586         for (std::vector<ld::File*>::const_iterator it = _inputFiles.begin(); it != _inputFiles.end(); ++it) {
 587                 if ( strcmp(path, (*it)->path()) == 0 )
 588                         return true;
 589         }
 590         return false;
 591 }
 592
 593
 594 void InputFiles::addLinkerOptionLibraries(ld::Internal& state, ld::File::AtomHandler& handler)
 595 {
 596     if ( _options.outputKind() == Options::kObjectFile )
 597                 return;
 598
 599         // process frameworks specified in .o linker options
 600         for (CStringSet::const_iterator it = state.linkerOptionFrameworks.begin(); it != state.linkerOptionFrameworks.end(); ++it) {
 601                 const char* frameworkName = *it;
 602                 Options::FileInfo info = _options.findFramework(frameworkName);
 603                 if ( ! this->libraryAlreadyLoaded(info.path) ) {
 604                         info.ordinal = _linkerOptionOrdinal.nextLinkerOptionOrdinal();
 605                         try {
 606                                 ld::File* reader = this->makeFile(info, true);
 607                                 ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 608                                 if ( dylibReader != NULL ) {
 609                                         if ( ! dylibReader->installPathVersionSpecific() ) {
 610                                                 dylibReader->forEachAtom(handler);
 611                                                 dylibReader->setImplicitlyLinked();
 612                                                 this->addDylib(dylibReader, info);
 613                                         }
 614                                 }
 615                                 else {
 616                                         throwf("framework linker option at %s is not a dylib", info.path);
 617                                 }
 618                         }
 619                         catch (const char* msg) {
 620                                 warning("Auto-Linking supplied '%s', %s", info.path, msg);
 621                         }
 622                 }
 623         }
 624         // process libraries specified in .o linker options
 625         for (CStringSet::const_iterator it = state.linkerOptionLibraries.begin(); it != state.linkerOptionLibraries.end(); ++it) {
 626                 const char* libName = *it;
 627                 Options::FileInfo info = _options.findLibrary(libName);
 628                 if ( ! this->libraryAlreadyLoaded(info.path) ) {
 629                         info.ordinal = _linkerOptionOrdinal.nextLinkerOptionOrdinal();
 630                         try {
 631                                 //<rdar://problem/17787306> -force_load_swift_libs
 632                                 info.options.fForceLoad = _options.forceLoadSwiftLibs() && (strncmp(libName, "swift", 5) == 0);
 633                                 ld::File* reader = this->makeFile(info, true);
 634                                 ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 635                                 ld::archive::File* archiveReader = dynamic_cast<ld::archive::File*>(reader);
 636                                 if ( dylibReader != NULL ) {
 637                                         dylibReader->forEachAtom(handler);
 638                                         dylibReader->setImplicitlyLinked();
 639                                         this->addDylib(dylibReader, info);
 640                                 }
 641                                 else if ( archiveReader != NULL ) {
 642                                         _searchLibraries.push_back(LibraryInfo(archiveReader));
 643                                         if ( _options.dumpDependencyInfo() )
 644                                                 _options.dumpDependency(Options::depArchive, archiveReader->path());
 645                                         //<rdar://problem/17787306> -force_load_swift_libs
 646                                         if (info.options.fForceLoad) {
 647                                                 archiveReader->forEachAtom(handler);
 648                                         }
 649                                 }
 650                                 else {
 651                                         throwf("linker option dylib at %s is not a dylib", info.path);
 652                                 }
 653                         }
 654                         catch (const char* msg) {
 655                                 warning("Auto-Linking supplied '%s', %s", info.path, msg);
 656                         }
 657                 }
 658         }
 659 }
 660
 661 void InputFiles::createIndirectDylibs()
 662 {
 663         // keep processing dylibs until no more dylibs are added
 664         unsigned long lastMapSize = 0;
 665         std::set<ld::dylib::File*>  dylibsProcessed;
 666         while ( lastMapSize != _allDylibs.size() ) {
 667                 lastMapSize = _allDylibs.size();
 668                 // can't iterator _installPathToDylibs while modifying it, so use temp buffer
 669                 std::vector<ld::dylib::File*> unprocessedDylibs;
 670                 for (std::set<ld::dylib::File*>::iterator it=_allDylibs.begin(); it != _allDylibs.end(); it++) {
 671                         if ( dylibsProcessed.count(*it) == 0 )
 672                                 unprocessedDylibs.push_back(*it);
 673                 }
 674                 for (std::vector<ld::dylib::File*>::iterator it=unprocessedDylibs.begin(); it != unprocessedDylibs.end(); it++) {
 675                         dylibsProcessed.insert(*it);
 676                         (*it)->processIndirectLibraries(this, _options.implicitlyLinkIndirectPublicDylibs());
 677                 }
 678         }
 679
 680         // go back over original dylibs and mark sub frameworks as re-exported
 681         if ( _options.outputKind() == Options::kDynamicLibrary ) {
 682                 const char* myLeaf = strrchr(_options.installPath(), '/');
 683                 if ( myLeaf != NULL ) {
 684                         for (std::vector<class ld::File*>::const_iterator it=_inputFiles.begin(); it != _inputFiles.end(); it++) {
 685                                 ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(*it);
 686                                 if ( dylibReader != NULL ) {
 687                                         const char* childParent = dylibReader->parentUmbrella();
 688                                         if ( childParent != NULL ) {
 689                                                 if ( strcmp(childParent, &myLeaf[1]) == 0 ) {
 690                                                         // mark that this dylib will be re-exported
 691                                                         dylibReader->setWillBeReExported();
 692                                                 }
 693                                         }
 694                                 }
 695                         }
 696                 }
 697         }
 698
 699 }
 700
 701 void InputFiles::createOpaqueFileSections()
 702 {
 703         // extra command line sections always at end
 704         for (Options::ExtraSection::const_iterator it=_options.extraSectionsBegin(); it != _options.extraSectionsEnd(); ++it) {
 705                 _inputFiles.push_back(opaque_section::parse(it->segmentName, it->sectionName, it->path, it->data, it->dataLen));
 706                 if ( _options.dumpDependencyInfo() )
 707                         _options.dumpDependency(Options::depSection, it->path);
 708         }
 709
 710 }
 711
 712
 713 void InputFiles::checkDylibClientRestrictions(ld::dylib::File* dylib)
 714 {
 715         // Check for any restrictions on who can link with this dylib
 716         const char* dylibParentName = dylib->parentUmbrella() ;
 717         const std::vector<const char*>* clients = dylib->allowableClients();
 718         if ( (dylibParentName != NULL) || (clients != NULL) ) {
 719                 // only dylibs that are in an umbrella or have a client list need verification
 720                 const char* installName = _options.installPath();
 721                 const char* installNameLastSlash = strrchr(installName, '/');
 722                 bool isParent = false;
 723                 bool isSibling = false;
 724                 bool isAllowableClient = false;
 725                 // There are three cases:
 726                 if ( (dylibParentName != NULL) && (installNameLastSlash != NULL) ) {
 727                         // starts after last slash
 728                         const char* myName = &installNameLastSlash[1];
 729                         unsigned int myNameLen = strlen(myName);
 730                         if ( strncmp(myName, "lib", 3) == 0 )
 731                                 myName = &myName[3];
 732                         // up to first dot
 733                         const char* firstDot = strchr(myName, '.');
 734                         if ( firstDot != NULL )
 735                                 myNameLen = firstDot - myName;
 736                         // up to first underscore
 737                         const char* firstUnderscore = strchr(myName, '_');
 738                         if ( (firstUnderscore != NULL) && ((firstUnderscore - myName) < (int)myNameLen) )
 739                                 myNameLen = firstUnderscore - myName;
 740
 741                         // case 1) The dylib has a parent umbrella, and we are creating the parent umbrella
 742                         isParent = ( (strlen(dylibParentName) == myNameLen) && (strncmp(myName, dylibParentName, myNameLen) == 0) );
 743
 744                         // case 2) The dylib has a parent umbrella, and we are creating a sibling with the same parent
 745                         isSibling = ( (_options.umbrellaName() != NULL) && (strcmp(_options.umbrellaName(), dylibParentName) == 0) );
 746                 }
 747
 748                 if ( !isParent && !isSibling && (clients != NULL) ) {
 749                         // case 3) the dylib has a list of allowable clients, and we are creating one of them
 750                         const char* clientName = _options.clientName();
 751                         int clientNameLen = 0;
 752                         if ( clientName != NULL ) {
 753                                 // use client name as specified on command line
 754                                 clientNameLen = strlen(clientName);
 755                         }
 756                         else {
 757                                 // infer client name from output path (e.g. xxx/libfoo_variant.A.dylib --> foo, Bar.framework/Bar_variant --> Bar)
 758                                 clientName = installName;
 759                                 clientNameLen = strlen(clientName);
 760                                 // starts after last slash
 761                                 if ( installNameLastSlash != NULL )
 762                                         clientName = &installNameLastSlash[1];
 763                                 if ( strncmp(clientName, "lib", 3) == 0 )
 764                                         clientName = &clientName[3];
 765                                 // up to first dot
 766                                 const char* firstDot = strchr(clientName, '.');
 767                                 if ( firstDot != NULL )
 768                                         clientNameLen = firstDot - clientName;
 769                                 // up to first underscore
 770                                 const char* firstUnderscore = strchr(clientName, '_');
 771                                 if ( (firstUnderscore != NULL) && ((firstUnderscore - clientName) < clientNameLen) )
 772                                         clientNameLen = firstUnderscore - clientName;
 773                         }
 774
 775                         // Use clientName to check if this dylib is able to link against the allowable clients.
 776                         for (std::vector<const char*>::const_iterator it = clients->begin(); it != clients->end(); it++) {
 777                                 if ( strncmp(*it, clientName, clientNameLen) == 0 )
 778                                         isAllowableClient = true;
 779                         }
 780                 }
 781
 782                 if ( !isParent && !isSibling && !isAllowableClient ) {
 783                         if ( dylibParentName != NULL ) {
 784                                 throwf("cannot link directly with %s.  Link against the umbrella framework '%s.framework' instead.",
 785                                         dylib->path(), dylibParentName);
 786                         }
 787                         else {
 788                                 throwf("cannot link directly with %s", dylib->path());
 789                         }
 790                 }
 791         }
 792 }
 793
 794
 795 void InputFiles::inferArchitecture(Options& opts, const char** archName)
 796 {
 797         _inferredArch = true;
 798         // scan all input files, looking for a thin .o file.
 799         // the first one found is presumably the architecture to link
 800         uint8_t buffer[4096];
 801         const std::vector<Options::FileInfo>& files = opts.getInputFiles();
 802         for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
 803                 int fd = ::open(it->path, O_RDONLY, 0);
 804                 if ( fd != -1 ) {
 805                         struct stat stat_buf;
 806                         if ( fstat(fd, &stat_buf) != -1) {
 807                                 ssize_t readAmount = stat_buf.st_size;
 808                                 if ( 4096 < readAmount )
 809                                         readAmount = 4096;
 810                                 ssize_t amount = read(fd, buffer, readAmount);
 811                                 ::close(fd);
 812                                 if ( amount >= readAmount ) {
 813                                         cpu_type_t type;
 814                                         cpu_subtype_t subtype;
 815                                         Options::Platform platform;
 816                                         if ( mach_o::relocatable::isObjectFile(buffer, &type, &subtype, &platform) ) {
 817                                                 opts.setArchitecture(type, subtype, platform);
 818                                                 *archName = opts.architectureName();
 819                                                 return;
 820                                         }
 821                                 }
 822                         }
 823                 }
 824         }
 825
 826         // no thin .o files found, so default to same architecture this tool was built as
 827         warning("-arch not specified");
 828 #if __i386__
 829         opts.setArchitecture(CPU_TYPE_I386, CPU_SUBTYPE_X86_ALL, Options::kPlatformOSX);
 830 #elif __x86_64__
 831         opts.setArchitecture(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL, Options::kPlatformOSX);
 832 #elif __arm__
 833         opts.setArchitecture(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6, Options::kPlatformOSX);
 834 #else
 835         #error unknown default architecture
 836 #endif
 837         *archName = opts.architectureName();
 838 }
 839
 840
 841 InputFiles::InputFiles(Options& opts, const char** archName)
 842  : _totalObjectSize(0), _totalArchiveSize(0),
 843    _totalObjectLoaded(0), _totalArchivesLoaded(0), _totalDylibsLoaded(0),
 844         _options(opts), _bundleLoader(NULL),
 845         _inferredArch(false),
 846         _exception(NULL),
 847         _indirectDylibOrdinal(ld::File::Ordinal::indirectDylibBase()),
 848         _linkerOptionOrdinal(ld::File::Ordinal::linkeOptionBase())
 849 {
 850 //      fStartCreateReadersTime = mach_absolute_time();
 851         if ( opts.architecture() == 0 ) {
 852                 // command line missing -arch, so guess arch
 853                 inferArchitecture(opts, archName);
 854         }
 855 #if HAVE_PTHREADS
 856         pthread_mutex_init(&_parseLock, NULL);
 857         pthread_cond_init(&_parseWorkReady, NULL);
 858         pthread_cond_init(&_newFileAvailable, NULL);
 859 #endif
 860         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
 861         if ( files.size() == 0 )
 862                 throw "no object files specified";
 863
 864         _inputFiles.reserve(files.size());
 865 #if HAVE_PTHREADS
 866         unsigned int inputFileSlot = 0;
 867         _availableInputFiles = 0;
 868         _parseCursor = 0;
 869 #endif
 870         Options::FileInfo* entry;
 871         for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
 872                 entry = (Options::FileInfo*)&(*it);
 873 #if HAVE_PTHREADS
 874                 // Assign input file slots to all the FileInfos.
 875                 // Also chain all FileInfos into one big list to set up for worker threads to do parsing.
 876                 entry->inputFileSlot = inputFileSlot;
 877                 entry->readyToParse = !entry->fromFileList || !_options.pipelineEnabled();
 878                 if (entry->readyToParse)
 879                         _availableInputFiles++;
 880                 _inputFiles.push_back(NULL);
 881                 inputFileSlot++;
 882 #else
 883                 // In the non-threaded case just parse the file now.
 884                 _inputFiles.push_back(makeFile(*entry, false));
 885 #endif
 886         }
 887
 888 #if HAVE_PTHREADS
 889         _remainingInputFiles = files.size();
 890
 891         // initialize info for parsing input files on worker threads
 892         unsigned int ncpus;
 893         int mib[2];
 894         size_t len = sizeof(ncpus);
 895         mib[0] = CTL_HW;
 896         mib[1] = HW_NCPU;
 897         if (sysctl(mib, 2, &ncpus, &len, NULL, 0) != 0) {
 898                 ncpus = 1;
 899         }
 900         _availableWorkers = MIN(ncpus, files.size()); // max # workers we permit
 901         _idleWorkers = 0;
 902
 903         if (_options.pipelineEnabled()) {
 904                 // start up a thread to listen for available input files
 905                 startThread(InputFiles::waitForInputFiles);
 906         }
 907
 908         // Start up one parser thread. More start on demand as parsed input files get consumed.
 909         startThread(InputFiles::parseWorkerThread);
 910         _availableWorkers--;
 911 #else
 912         if (_options.pipelineEnabled()) {
 913                 throwf("pipelined linking not supported on this platform");
 914         }
 915 #endif
 916 }
 917
 918
 919 #if HAVE_PTHREADS
 920 void InputFiles::startThread(void (*threadFunc)(InputFiles *)) const {
 921         pthread_t thread;
 922         pthread_attr_t attr;
 923         pthread_attr_init(&attr);
 924         // set a nice big stack (same as main thread) because some code uses potentially large stack buffers
 925         pthread_attr_setstacksize(&attr, 8 * 1024 * 1024);
 926         pthread_create(&thread, &attr, (void *(*)(void*))threadFunc, (void *)this);
 927         pthread_detach(thread);
 928         pthread_attr_destroy(&attr);
 929 }
 930
 931 // Work loop for input file parsing threads
 932 void InputFiles::parseWorkerThread() {
 933         ld::File *file;
 934         const char *exception = NULL;
 935         pthread_mutex_lock(&_parseLock);
 936         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
 937         if (_s_logPThreads) printf("worker starting\n");
 938         do {
 939                 if (_availableInputFiles == 0) {
 940                         _idleWorkers++;
 941                         pthread_cond_wait(&_parseWorkReady, &_parseLock);
 942                         _idleWorkers--;
 943                 } else {
 944                         int slot = _parseCursor;
 945                         while (slot < (int)files.size() && (_inputFiles[slot] != NULL || !files[slot].readyToParse))
 946                                 slot++;
 947                         assert(slot < (int)files.size());
 948                         Options::FileInfo& entry = (Options::FileInfo&)files[slot];
 949                         _parseCursor = slot+1;
 950                         _availableInputFiles--;
 951                         entry.readyToParse = false; // to avoid multiple threads finding this file
 952                         pthread_mutex_unlock(&_parseLock);
 953                         if (_s_logPThreads) printf("parsing index %u\n", slot);
 954                         try {
 955                                 file = makeFile(entry, false);
 956                         }
 957                         catch (const char *msg) {
 958                                 if ( (strstr(msg, "architecture") != NULL) && !_options.errorOnOtherArchFiles() ) {
 959                                         if ( _options.ignoreOtherArchInputFiles() ) {
 960                                                 // ignore, because this is about an architecture not in use
 961                                         }
 962                                         else {
 963                                                 warning("ignoring file %s, %s", entry.path, msg);
 964                                         }
 965                                 }
 966                                 else if ( strstr(msg, "ignoring unexpected") != NULL ) {
 967                                         warning("%s, %s", entry.path, msg);
 968                                 }
 969                                 else {
 970                                         asprintf((char**)&exception, "%s file '%s'", msg, entry.path);
 971                                 }
 972                                 file = new IgnoredFile(entry.path, entry.modTime, entry.ordinal, ld::File::Other);
 973                         }
 974                         pthread_mutex_lock(&_parseLock);
 975                         if (_remainingInputFiles > 0)
 976                                 _remainingInputFiles--;
 977                         if (_s_logPThreads) printf("done with index %u, %d remaining\n", slot, _remainingInputFiles);
 978                         if (exception) {
 979                                 // We are about to die, so set to zero to stop other threads from doing unneeded work.
 980                                 _remainingInputFiles = 0;
 981                                 _exception = exception;
 982                         }
 983                         else {
 984                                 _inputFiles[slot] = file;
 985                                 if (_neededFileSlot == slot)
 986                                         pthread_cond_signal(&_newFileAvailable);
 987                         }
 988                 }
 989         } while (_remainingInputFiles);
 990         if (_s_logPThreads) printf("worker exiting\n");
 991         pthread_cond_broadcast(&_parseWorkReady);
 992         pthread_cond_signal(&_newFileAvailable);
 993         pthread_mutex_unlock(&_parseLock);
 994 }
 995
 996
 997 void InputFiles::parseWorkerThread(InputFiles *inputFiles) {
 998         inputFiles->parseWorkerThread();
 999 }
1000 #endif
1001
1002
1003 ld::File* InputFiles::addDylib(ld::dylib::File* reader, const Options::FileInfo& info)
1004 {
1005         _allDylibs.insert(reader);
1006
1007         if ( (reader->installPath() == NULL) && !info.options.fBundleLoader ) {
1008                 // this is a "blank" stub
1009                 // silently ignore it
1010                 return reader;
1011         }
1012         // store options about how dylib will be used in dylib itself
1013         if ( info.options.fWeakImport )
1014                 reader->setForcedWeakLinked();
1015         if ( info.options.fReExport )
1016                 reader->setWillBeReExported();
1017         if ( info.options.fUpward ) {
1018                 if ( _options.outputKind() == Options::kDynamicLibrary )
1019                         reader->setWillBeUpwardDylib();
1020                 else
1021                         warning("ignoring upward dylib option for %s\n", info.path);
1022         }
1023         if ( info.options.fLazyLoad )
1024                 reader->setWillBeLazyLoadedDylb();
1025
1026         // add to map of loaded dylibs
1027         const char* installPath = reader->installPath();
1028         if ( installPath != NULL ) {
1029                 InstallNameToDylib::iterator pos = _installPathToDylibs.find(installPath);
1030                 if ( pos == _installPathToDylibs.end() ) {
1031                         _installPathToDylibs[strdup(installPath)] = reader;
1032                 }
1033                 else {
1034                         bool dylibOnCommandLineTwice = ( strcmp(pos->second->path(), reader->path()) == 0 );
1035                         bool isSymlink = false;
1036                         // ignore if this is a symlink to a dylib we've already loaded
1037                         if ( !dylibOnCommandLineTwice ) {
1038                                 char existingDylibPath[PATH_MAX];
1039                                 if ( realpath(pos->second->path(), existingDylibPath) != NULL ) {
1040                                         char newDylibPath[PATH_MAX];
1041                                         if ( realpath(reader->path(), newDylibPath) != NULL ) {
1042                                                 isSymlink = ( strcmp(existingDylibPath, newDylibPath) == 0 );
1043                                         }
1044                                 }
1045                         }
1046                         // remove warning for <rdar://problem/10860629> Same install name for CoreServices and CFNetwork?
1047                         //if ( !dylibOnCommandLineTwice && !isSymlink )
1048                         //      warning("dylibs with same install name: %p %s and %p %s", pos->second, pos->second->path(), reader, reader->path());
1049                 }
1050         }
1051         else if ( info.options.fBundleLoader )
1052                 _bundleLoader = reader;
1053
1054         // log direct readers
1055         if ( ! info.options.fIndirectDylib )
1056                 this->logDylib(reader, false);
1057
1058         // update stats
1059         _totalDylibsLoaded++;
1060
1061         // just add direct libraries to search-first list
1062         if ( ! info.options.fIndirectDylib )
1063                 _searchLibraries.push_back(LibraryInfo(reader));
1064
1065         return reader;
1066 }
1067
1068
1069 #if HAVE_PTHREADS
1070 // Called during pipelined linking to listen for available input files.
1071 // Available files are enqueued for parsing.
1072 void InputFiles::waitForInputFiles()
1073 {
1074         if (_s_logPThreads) printf("starting pipeline listener\n");
1075         try {
1076                 const char *fifo = _options.pipelineFifo();
1077                 assert(fifo);
1078                 std::map<const char *, const Options::FileInfo*, strcompclass> fileMap;
1079                 const std::vector<Options::FileInfo>& files = _options.getInputFiles();
1080                 for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
1081                         const Options::FileInfo& entry = *it;
1082                         if (entry.fromFileList) {
1083                                 fileMap[entry.path] = &entry;
1084                         }
1085                 }
1086                 FILE *fileStream = fopen(fifo, "r");
1087                 if (!fileStream)
1088                         throwf("pipelined linking error - failed to open stream. fopen() returns %s for \"%s\"\n", strerror(errno), fifo);
1089                 while (fileMap.size() > 0) {
1090                         char path_buf[PATH_MAX+1];
1091                         if (fgets(path_buf, PATH_MAX, fileStream) == NULL)
1092                                 throwf("pipelined linking error - %lu missing input files", fileMap.size());
1093                         int len = strlen(path_buf);
1094                         if (path_buf[len-1] == '\n')
1095                                 path_buf[len-1] = 0;
1096                         std::map<const char *, const Options::FileInfo*, strcompclass>::iterator it = fileMap.find(path_buf);
1097                         if (it == fileMap.end())
1098                                 throwf("pipelined linking error - not in file list: %s\n", path_buf);
1099                         Options::FileInfo* inputInfo = (Options::FileInfo*)it->second;
1100                         if (!inputInfo->checkFileExists(_options))
1101                                 throwf("pipelined linking error - file does not exist: %s\n", inputInfo->path);
1102                         pthread_mutex_lock(&_parseLock);
1103                         if (_idleWorkers)
1104                                 pthread_cond_signal(&_parseWorkReady);
1105                         inputInfo->readyToParse = true;
1106                         if (_parseCursor > inputInfo->inputFileSlot)
1107                                 _parseCursor = inputInfo->inputFileSlot;
1108                         _availableInputFiles++;
1109                         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);
1110                         pthread_mutex_unlock(&_parseLock);
1111                         fileMap.erase(it);
1112                 }
1113         } catch (const char *msg) {
1114                 pthread_mutex_lock(&_parseLock);
1115                 _exception = msg;
1116                 pthread_cond_signal(&_newFileAvailable);
1117                 pthread_mutex_unlock(&_parseLock);
1118         }
1119 }
1120
1121
1122 void InputFiles::waitForInputFiles(InputFiles *inputFiles) {
1123         inputFiles->waitForInputFiles();
1124 }
1125 #endif
1126
1127
1128 void InputFiles::forEachInitialAtom(ld::File::AtomHandler& handler, ld::Internal& state)
1129 {
1130         // add all direct object, archives, and dylibs
1131         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
1132         size_t fileIndex;
1133         for (fileIndex=0; fileIndex<_inputFiles.size(); fileIndex++) {
1134                 ld::File *file;
1135 #if HAVE_PTHREADS
1136                 pthread_mutex_lock(&_parseLock);
1137
1138                 // this loop waits for the needed file to be ready (parsed by worker thread)
1139                 while (_inputFiles[fileIndex] == NULL && _exception == NULL) {
1140                         // We are starved for input. If there are still files to parse and we have
1141                         // not maxed out the worker thread count start a new worker thread.
1142                         if (_availableInputFiles > 0 && _availableWorkers > 0) {
1143                                 if (_s_logPThreads) printf("starting worker\n");
1144                                 startThread(InputFiles::parseWorkerThread);
1145                                 _availableWorkers--;
1146                         }
1147                         _neededFileSlot = fileIndex;
1148                         if (_s_logPThreads) printf("consumer blocking for %lu: %s\n", fileIndex, files[fileIndex].path);
1149                         pthread_cond_wait(&_newFileAvailable, &_parseLock);
1150                 }
1151
1152                 if (_exception)
1153                         throw _exception;
1154
1155                 // The input file is parsed. Assimilate it and call its atom iterator.
1156                 if (_s_logPThreads) printf("consuming slot %lu\n", fileIndex);
1157                 file = _inputFiles[fileIndex];
1158                 pthread_mutex_unlock(&_parseLock);
1159 #else
1160                 file = _inputFiles[fileIndex];
1161 #endif
1162                 const Options::FileInfo& info = files[fileIndex];
1163                 switch (file->type()) {
1164                         case ld::File::Reloc:
1165                         {
1166                                 ld::relocatable::File* reloc = (ld::relocatable::File*)file;
1167                                 _options.snapshot().recordObjectFile(reloc->path());
1168                                 if ( _options.dumpDependencyInfo() )
1169                                         _options.dumpDependency(Options::depObjectFile, reloc->path());
1170                         }
1171                                 break;
1172                         case ld::File::Dylib:
1173                         {
1174                                 ld::dylib::File* dylib = (ld::dylib::File*)file;
1175                                 addDylib(dylib, info);
1176                         }
1177                                 break;
1178                         case ld::File::Archive:
1179                         {
1180                                 ld::archive::File* archive = (ld::archive::File*)file;
1181                                 // <rdar://problem/9740166> force loaded archives should be in LD_TRACE
1182                                 if ( (info.options.fForceLoad || _options.fullyLoadArchives()) && _options.traceArchives() )
1183                                         logArchive(archive);
1184                                 _searchLibraries.push_back(LibraryInfo(archive));
1185                                 if ( _options.dumpDependencyInfo() )
1186                                         _options.dumpDependency(Options::depArchive, archive->path());
1187                         }
1188                                 break;
1189                         case ld::File::Other:
1190                                 break;
1191                         default:
1192                         {
1193                                 throwf("Unknown file type for %s", file->path());
1194                         }
1195                                 break;
1196                 }
1197                 file->forEachAtom(handler);
1198         }
1199
1200         markExplicitlyLinkedDylibs();
1201         addLinkerOptionLibraries(state, handler);
1202         createIndirectDylibs();
1203         createOpaqueFileSections();
1204
1205         while (fileIndex < _inputFiles.size()) {
1206                 ld::File *file = _inputFiles[fileIndex];
1207                 file->forEachAtom(handler);
1208                 fileIndex++;
1209         }
1210
1211     switch ( _options.outputKind() ) {
1212         case Options::kStaticExecutable:
1213         case Options::kDynamicExecutable:
1214             // add implicit __dso_handle label
1215             handler.doAtom(DSOHandleAtom::_s_atomExecutable);
1216             handler.doAtom(DSOHandleAtom::_s_atomAll);
1217             if ( _options.pageZeroSize() != 0 )
1218                 handler.doAtom(*new PageZeroAtom(_options.pageZeroSize()));
1219             if ( _options.hasCustomStack() && !_options.needsEntryPointLoadCommand() )
1220                 handler.doAtom(*new CustomStackAtom(_options.customStackSize()));
1221             break;
1222         case Options::kDynamicLibrary:
1223             // add implicit __dso_handle label
1224             handler.doAtom(DSOHandleAtom::_s_atomDylib);
1225             handler.doAtom(DSOHandleAtom::_s_atomAll);
1226             break;
1227         case Options::kDynamicBundle:
1228             // add implicit __dso_handle label
1229             handler.doAtom(DSOHandleAtom::_s_atomBundle);
1230             handler.doAtom(DSOHandleAtom::_s_atomAll);
1231             break;
1232         case Options::kDyld:
1233             // add implicit __dso_handle label
1234             handler.doAtom(DSOHandleAtom::_s_atomDyld);
1235             handler.doAtom(DSOHandleAtom::_s_atomAll);
1236             break;
1237         case Options::kPreload:
1238             // add implicit __mh_preload_header label
1239             handler.doAtom(DSOHandleAtom::_s_atomPreload);
1240             // add implicit __dso_handle label, but put it in __text section because
1241             // with -preload the mach_header is no in the address space.
1242             handler.doAtom(DSOHandleAtom::_s_atomPreloadDSO);
1243             break;
1244         case Options::kObjectFile:
1245             handler.doAtom(DSOHandleAtom::_s_atomObjectFile);
1246             break;
1247         case Options::kKextBundle:
1248             // add implicit __dso_handle label
1249             handler.doAtom(DSOHandleAtom::_s_atomAll);
1250             break;
1251         }
1252 }
1253
1254
1255 bool InputFiles::searchLibraries(const char* name, bool searchDylibs, bool searchArchives, bool dataSymbolOnly, ld::File::AtomHandler& handler) const
1256 {
1257         // Check each input library.
1258     for (std::vector<LibraryInfo>::const_iterator it=_searchLibraries.begin(); it != _searchLibraries.end(); ++it) {
1259         LibraryInfo lib = *it;
1260         if (lib.isDylib()) {
1261             if (searchDylibs) {
1262                 ld::dylib::File *dylibFile = lib.dylib();
1263                 //fprintf(stderr, "searchLibraries(%s), looking in linked %s\n", name, dylibFile->path() );
1264                 if ( dylibFile->justInTimeforEachAtom(name, handler) ) {
1265                     // we found a definition in this dylib
1266                     // done, unless it is a weak definition in which case we keep searching
1267                     _options.snapshot().recordDylibSymbol(dylibFile, name);
1268                     if ( !dylibFile->hasWeakExternals() || !dylibFile->hasWeakDefinition(name)) {
1269                         return true;
1270                     }
1271                     // else continue search for a non-weak definition
1272                 }
1273             }
1274         } else {
1275             if (searchArchives) {
1276                 ld::archive::File *archiveFile = lib.archive();
1277                 if ( dataSymbolOnly ) {
1278                     if ( archiveFile->justInTimeDataOnlyforEachAtom(name, handler) ) {
1279                         if ( _options.traceArchives() )
1280                             logArchive(archiveFile);
1281                         _options.snapshot().recordArchive(archiveFile->path());
1282                         // found data definition in static library, done
1283                        return true;
1284                     }
1285                 }
1286                 else {
1287                     if ( archiveFile->justInTimeforEachAtom(name, handler) ) {
1288                         if ( _options.traceArchives() )
1289                             logArchive(archiveFile);
1290                         _options.snapshot().recordArchive(archiveFile->path());
1291                         // found definition in static library, done
1292                         return true;
1293                     }
1294                 }
1295             }
1296         }
1297     }
1298
1299         // search indirect dylibs
1300         if ( searchDylibs ) {
1301                 for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1302                         ld::dylib::File* dylibFile = it->second;
1303                         bool searchThisDylib = false;
1304                         if ( _options.nameSpace() == Options::kTwoLevelNameSpace ) {
1305                                 // for two level namesapce, just check all implicitly linked dylibs
1306                                 searchThisDylib = dylibFile->implicitlyLinked() && !dylibFile->explicitlyLinked();
1307                         }
1308                         else {
1309                                 // for flat namespace, check all indirect dylibs
1310                                 searchThisDylib = ! dylibFile->explicitlyLinked();
1311                         }
1312                         if ( searchThisDylib ) {
1313                                 //fprintf(stderr, "searchLibraries(%s), looking in implicitly linked %s\n", name, dylibFile->path() );
1314                                 if ( dylibFile->justInTimeforEachAtom(name, handler) ) {
1315                                         // we found a definition in this dylib
1316                                         // done, unless it is a weak definition in which case we keep searching
1317                     _options.snapshot().recordDylibSymbol(dylibFile, name);
1318                                         if ( !dylibFile->hasWeakExternals() || !dylibFile->hasWeakDefinition(name)) {
1319                                                 return true;
1320                     }
1321                                         // else continue search for a non-weak definition
1322                                 }
1323                         }
1324                 }
1325         }
1326
1327         return false;
1328 }
1329
1330
1331 bool InputFiles::searchWeakDefInDylib(const char* name) const
1332 {
1333         // search all relevant dylibs to see if any have a weak-def with this name
1334         for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1335                 ld::dylib::File* dylibFile = it->second;
1336                 if ( dylibFile->implicitlyLinked() || dylibFile->explicitlyLinked() ) {
1337                         if ( dylibFile->hasWeakExternals() && dylibFile->hasWeakDefinition(name) ) {
1338                                 return true;
1339                         }
1340                 }
1341         }
1342         return false;
1343 }
1344
1345 static bool vectorContains(const std::vector<ld::dylib::File*>& vec, ld::dylib::File* key)
1346 {
1347         return std::find(vec.begin(), vec.end(), key) != vec.end();
1348 }
1349
1350 struct DylibByInstallNameSorter
1351 {
1352          bool operator()(const ld::dylib::File* left, const ld::dylib::File* right)
1353          {
1354           return (strcmp(left->installPath(), right->installPath()) < 0);
1355          }
1356 };
1357
1358 void InputFiles::dylibs(ld::Internal& state)
1359 {
1360         bool dylibsOK = false;
1361         switch ( _options.outputKind() ) {
1362                 case Options::kDynamicExecutable:
1363                 case Options::kDynamicLibrary:
1364                 case Options::kDynamicBundle:
1365                         dylibsOK = true;
1366                         break;
1367                 case Options::kStaticExecutable:
1368                 case Options::kDyld:
1369                 case Options::kPreload:
1370                 case Options::kObjectFile:
1371                 case Options::kKextBundle:
1372                         dylibsOK = false;
1373                         break;
1374         }
1375
1376         // add command line dylibs in order
1377         for (std::vector<ld::File*>::const_iterator it=_inputFiles.begin(); it != _inputFiles.end(); ++it) {
1378                 ld::dylib::File* dylibFile = dynamic_cast<ld::dylib::File*>(*it);
1379                 // only add dylibs that are not "blank" dylib stubs
1380                 if ( (dylibFile != NULL) && ((dylibFile->installPath() != NULL) || (dylibFile == _bundleLoader)) ) {
1381                         if ( dylibsOK ) {
1382                                 if ( ! vectorContains(state.dylibs, dylibFile) ) {
1383                                         state.dylibs.push_back(dylibFile);
1384                                 }
1385                         }
1386                         else
1387                                 warning("unexpected dylib (%s) on link line", dylibFile->path());
1388                 }
1389         }
1390         // add implicitly linked dylibs
1391         if ( _options.nameSpace() == Options::kTwoLevelNameSpace ) {
1392                 std::vector<ld::dylib::File*> implicitDylibs;
1393                 for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1394                         ld::dylib::File* dylibFile = it->second;
1395                         if ( dylibFile->implicitlyLinked() && dylibsOK ) {
1396                                 if ( ! vectorContains(implicitDylibs, dylibFile) ) {
1397                                         implicitDylibs.push_back(dylibFile);
1398                                 }
1399                         }
1400                 }
1401                 // <rdar://problem/15002251> make implicit dylib order be deterministic by sorting by install_name
1402                 std::sort(implicitDylibs.begin(), implicitDylibs.end(), DylibByInstallNameSorter());
1403                 state.dylibs.insert(state.dylibs.end(), implicitDylibs.begin(), implicitDylibs.end());
1404         }
1405
1406         //fprintf(stderr, "all dylibs:\n");
1407         //for(std::vector<ld::dylib::File*>::iterator it=state.dylibs.begin(); it != state.dylibs.end(); ++it) {
1408         //      const ld::dylib::File* dylib = *it;
1409         //      fprintf(stderr, "    %p %s\n", dylib, dylib->path());
1410         //}
1411
1412         // and -bundle_loader
1413         state.bundleLoader = _bundleLoader;
1414
1415         // <rdar://problem/10807040> give an error when -nostdlib is used and libSystem is missing
1416         if ( (state.dylibs.size() == 0) && _options.needsEntryPointLoadCommand() )
1417                 throw "dynamic main executables must link with libSystem.dylib";
1418 }
1419
1420
1421 } // namespace tool
1422 } // namespace ld
1423