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
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  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 static bool isCompilerSupportLib(const char* path) {
 181         const char* libName = strrchr(path, '/');
 182         return ( (libName != NULL) && (strncmp(libName, "/libclang_rt", 12) == 0) );
 183 }
 184
 185
 186 const char* InputFiles::fileArch(const uint8_t* p, unsigned len)
 187 {
 188         const char* result = mach_o::relocatable::archName(p);
 189         if ( result != NULL  )
 190                  return result;
 191
 192     result = mach_o::dylib::archName(p);
 193     if ( result != NULL  )
 194                 return result;
 195
 196         result = lto::archName(p, len);
 197         if ( result != NULL  )
 198                  return result;
 199
 200         if ( strncmp((const char*)p, "!<arch>\n", 8) == 0 )
 201                 return "archive";
 202
 203         char *unsupported = (char *)malloc(128);
 204         strcpy(unsupported, "unsupported file format (");
 205         for (unsigned i=0; i<len && i < 16; i++) {
 206                 char buf[8];
 207                 sprintf(buf, " 0x%02X", p[i]);
 208                 strcat(unsupported, buf);
 209         }
 210         strcat(unsupported, " )");
 211         return unsupported;
 212 }
 213
 214
 215 ld::File* InputFiles::makeFile(const Options::FileInfo& info, bool indirectDylib)
 216 {
 217         // map in whole file
 218         struct stat stat_buf;
 219         int fd = ::open(info.path, O_RDONLY, 0);
 220         if ( fd == -1 )
 221                 throwf("can't open file, errno=%d", errno);
 222         if ( ::fstat(fd, &stat_buf) != 0 )
 223                 throwf("fstat(%s) failed, errno=%d\n", info.path, errno);
 224         if ( stat_buf.st_size < 20 )
 225                 throwf("file too small (length=%llu)", stat_buf.st_size);
 226         int64_t len = stat_buf.st_size;
 227         uint8_t* p = (uint8_t*)::mmap(NULL, stat_buf.st_size, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0);
 228         if ( p == (uint8_t*)(-1) )
 229                 throwf("can't map file, errno=%d", errno);
 230
 231         // if fat file, skip to architecture we want
 232         // Note: fat header is always big-endian
 233         bool isFatFile = false;
 234         uint32_t sliceToUse, sliceCount;
 235         const fat_header* fh = (fat_header*)p;
 236         if ( fh->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
 237                 isFatFile = true;
 238                 const struct fat_arch* archs = (struct fat_arch*)(p + sizeof(struct fat_header));
 239                 bool sliceFound = false;
 240                 sliceCount = OSSwapBigToHostInt32(fh->nfat_arch);
 241                 if ( _options.preferSubArchitecture() ) {
 242                         // first try to find a slice that match cpu-type and cpu-sub-type
 243                         for (uint32_t i=0; i < sliceCount; ++i) {
 244                                 if ( (OSSwapBigToHostInt32(archs[i].cputype) == (uint32_t)_options.architecture())
 245                                   && (OSSwapBigToHostInt32(archs[i].cpusubtype) == (uint32_t)_options.subArchitecture()) ) {
 246                                         sliceToUse = i;
 247                                         sliceFound = true;
 248                                         break;
 249                                 }
 250                         }
 251                 }
 252                 if ( !sliceFound ) {
 253                         // look for any slice that matches just cpu-type
 254                         for (uint32_t i=0; i < sliceCount; ++i) {
 255                                 if ( OSSwapBigToHostInt32(archs[i].cputype) == (uint32_t)_options.architecture() ) {
 256                                         sliceToUse = i;
 257                                         sliceFound = true;
 258                                         break;
 259                                 }
 260                         }
 261                 }
 262                 if ( sliceFound ) {
 263                         uint32_t fileOffset = OSSwapBigToHostInt32(archs[sliceToUse].offset);
 264                         len = OSSwapBigToHostInt32(archs[sliceToUse].size);
 265                         if ( fileOffset+len > stat_buf.st_size ) {
 266                                 // <rdar://problem/17593430> file size was read awhile ago.  If file is being written, wait a second to see if big enough now
 267                                 sleep(1);
 268                                 int64_t newFileLen = stat_buf.st_size;
 269                                 struct stat statBuffer;
 270                                 if ( stat(info.path, &statBuffer) == 0 ) {
 271                                         newFileLen = statBuffer.st_size;
 272                                 }
 273                                 if ( fileOffset+len > newFileLen ) {
 274                                         throwf("truncated fat file. Slice from %u to %llu is past end of file with length %llu",
 275                                                 fileOffset, fileOffset+len, stat_buf.st_size);
 276                                 }
 277                         }
 278                         // if requested architecture is page aligned within fat file, then remap just that portion of file
 279                         if ( (fileOffset & 0x00000FFF) == 0 ) {
 280                                 // unmap whole file
 281                                 munmap((caddr_t)p, stat_buf.st_size);
 282                                 // re-map just part we need
 283                                 p = (uint8_t*)::mmap(NULL, len, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, fileOffset);
 284                                 if ( p == (uint8_t*)(-1) )
 285                                         throwf("can't re-map file, errno=%d", errno);
 286                         }
 287                         else {
 288                                 p = &p[fileOffset];
 289                         }
 290                 }
 291         }
 292         ::close(fd);
 293
 294         // see if it is an object file
 295         mach_o::relocatable::ParserOptions objOpts;
 296         objOpts.architecture            = _options.architecture();
 297         objOpts.objSubtypeMustMatch = !_options.allowSubArchitectureMismatches();
 298         objOpts.logAllFiles                     = _options.logAllFiles();
 299         objOpts.warnUnwindConversionProblems    = _options.needsUnwindInfoSection();
 300         objOpts.keepDwarfUnwind         = _options.keepDwarfUnwind();
 301         objOpts.forceDwarfConversion= (_options.outputKind() == Options::kDyld);
 302         objOpts.neverConvertDwarf   = !_options.needsUnwindInfoSection();
 303         objOpts.verboseOptimizationHints = _options.verboseOptimizationHints();
 304         objOpts.armUsesZeroCostExceptions = _options.armUsesZeroCostExceptions();
 305         objOpts.simulator                       = _options.targetIOSSimulator();
 306         objOpts.ignoreMismatchPlatform = ((_options.outputKind() == Options::kPreload) || (_options.outputKind() == Options::kStaticExecutable));
 307         objOpts.subType                         = _options.subArchitecture();
 308         objOpts.platform                        = _options.platform();
 309         objOpts.minOSVersion            = _options.minOSversion();
 310         objOpts.srcKind                         = ld::relocatable::File::kSourceObj;
 311         objOpts.treateBitcodeAsData     = _options.bitcodeKind() == Options::kBitcodeAsData;
 312         objOpts.usingBitcode            = _options.bundleBitcode();
 313         objOpts.maxDefaultCommonAlignment = _options.maxDefaultCommonAlign();
 314
 315         ld::relocatable::File* objResult = mach_o::relocatable::parse(p, len, info.path, info.modTime, info.ordinal, objOpts);
 316         if ( objResult != NULL ) {
 317                 OSAtomicAdd64(len, &_totalObjectSize);
 318                 OSAtomicIncrement32(&_totalObjectLoaded);
 319                 return objResult;
 320         }
 321
 322         // see if it is an llvm object file
 323         objResult = lto::parse(p, len, info.path, info.modTime, info.ordinal, _options.architecture(), _options.subArchitecture(), _options.logAllFiles(), _options.verboseOptimizationHints());
 324         if ( objResult != NULL ) {
 325                 OSAtomicAdd64(len, &_totalObjectSize);
 326                 OSAtomicIncrement32(&_totalObjectLoaded);
 327                 return objResult;
 328         }
 329
 330         // see if it is a dynamic library (or text-based dynamic library)
 331         ld::dylib::File* dylibResult;
 332         bool dylibsNotAllowed = false;
 333         switch ( _options.outputKind() ) {
 334                 case Options::kDynamicExecutable:
 335                 case Options::kDynamicLibrary:
 336                 case Options::kDynamicBundle:
 337                         dylibResult = mach_o::dylib::parse(p, len, info.path, info.modTime, _options, info.ordinal, info.options.fBundleLoader, indirectDylib);
 338                         if ( dylibResult != NULL ) {
 339                                 return dylibResult;
 340                         }
 341                         dylibResult = textstub::dylib::parse(p, len, info.path, info.modTime, _options, info.ordinal, info.options.fBundleLoader, indirectDylib);
 342                         if ( dylibResult != NULL ) {
 343                                 return dylibResult;
 344                         }
 345                         break;
 346                 case Options::kStaticExecutable:
 347                 case Options::kDyld:
 348                 case Options::kPreload:
 349                 case Options::kObjectFile:
 350                 case Options::kKextBundle:
 351                         dylibsNotAllowed = true;
 352                         break;
 353         }
 354
 355         // see if it is a static library
 356         ::archive::ParserOptions archOpts;
 357         archOpts.objOpts                                = objOpts;
 358         archOpts.forceLoadThisArchive   = info.options.fForceLoad;
 359         archOpts.forceLoadAll                   = _options.fullyLoadArchives();
 360         archOpts.forceLoadObjC                  = _options.loadAllObjcObjectsFromArchives();
 361         archOpts.objcABI2                               = _options.objCABIVersion2POverride();
 362         archOpts.verboseLoad                    = _options.whyLoad();
 363         archOpts.logAllFiles                    = _options.logAllFiles();
 364         // Set ObjSource Kind, libclang_rt is compiler static library
 365         if ( isCompilerSupportLib(info.path) )
 366                 archOpts.objOpts.srcKind = ld::relocatable::File::kSourceCompilerArchive;
 367         else
 368                 archOpts.objOpts.srcKind = ld::relocatable::File::kSourceArchive;
 369         archOpts.objOpts.treateBitcodeAsData = _options.bitcodeKind() == Options::kBitcodeAsData;
 370         archOpts.objOpts.usingBitcode = _options.bundleBitcode();
 371
 372         ld::archive::File* archiveResult = ::archive::parse(p, len, info.path, info.modTime, info.ordinal, archOpts);
 373         if ( archiveResult != NULL ) {
 374
 375                 OSAtomicAdd64(len, &_totalArchiveSize);
 376                 OSAtomicIncrement32(&_totalArchivesLoaded);
 377                 return archiveResult;
 378         }
 379
 380         // does not seem to be any valid linker input file, check LTO misconfiguration problems
 381         if ( lto::archName((uint8_t*)p, len) != NULL ) {
 382                 if ( lto::libLTOisLoaded() ) {
 383                         throwf("lto file was built for %s which is not the architecture being linked (%s): %s", fileArch(p, len), _options.architectureName(), info.path);
 384                 }
 385                 else {
 386                         const char* libLTO = "libLTO.dylib";
 387                         char ldPath[PATH_MAX];
 388                         char tmpPath[PATH_MAX];
 389                         char libLTOPath[PATH_MAX];
 390                         uint32_t bufSize = PATH_MAX;
 391                         if ( _options.overridePathlibLTO() != NULL ) {
 392                                 libLTO = _options.overridePathlibLTO();
 393                         }
 394                         else if ( _NSGetExecutablePath(ldPath, &bufSize) != -1 ) {
 395                                 if ( realpath(ldPath, tmpPath) != NULL ) {
 396                                         char* lastSlash = strrchr(tmpPath, '/');
 397                                         if ( lastSlash != NULL )
 398                                                 strcpy(lastSlash, "/../lib/libLTO.dylib");
 399                                         libLTO = tmpPath;
 400                                         if ( realpath(tmpPath, libLTOPath) != NULL )
 401                                                 libLTO = libLTOPath;
 402                                 }
 403                         }
 404                         throwf("could not process llvm bitcode object file, because %s could not be loaded", libLTO);
 405                 }
 406         }
 407
 408         if ( dylibsNotAllowed ) {
 409                 cpu_type_t dummy1;
 410                 cpu_type_t dummy2;
 411                 if ( mach_o::dylib::isDylibFile(p, &dummy1, &dummy2) )
 412                         throw "ignoring unexpected dylib file";
 413         }
 414
 415         // error handling
 416         if ( ((fat_header*)p)->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
 417                 throwf("missing required architecture %s in file %s (%u slices)", _options.architectureName(), info.path, sliceCount);
 418         }
 419         else {
 420                 if ( isFatFile )
 421                         throwf("file is universal (%u slices) but does not contain a(n) %s slice: %s", sliceCount, _options.architectureName(), info.path);
 422                 else
 423                         throwf("file was built for %s which is not the architecture being linked (%s): %s", fileArch(p, len), _options.architectureName(), info.path);
 424         }
 425 }
 426
 427 void InputFiles::logDylib(ld::File* file, bool indirect, bool speculative)
 428 {
 429         if ( _options.traceDylibs() ) {
 430                 const char* fullPath = file->path();
 431                 char realName[MAXPATHLEN];
 432                 if ( realpath(fullPath, realName) != NULL )
 433                         fullPath = realName;
 434                 const ld::dylib::File* dylib = dynamic_cast<const ld::dylib::File*>(file);
 435                 if ( (dylib != NULL ) && dylib->willBeUpwardDylib() ) {
 436                         // don't log upward dylibs when XBS is computing dependencies
 437                         logTraceInfo("[Logging for XBS] Used upward dynamic library: %s\n", fullPath);
 438                 }
 439                 else if ( (dylib != NULL ) && dylib->speculativelyLoaded() ) {
 440                         logTraceInfo("[Logging for XBS] Speculatively loaded dynamic library: %s\n", fullPath);
 441                 }
 442                 else {
 443                         if ( indirect ) {
 444                                 if ( speculative )
 445                                         logTraceInfo("[Logging for XBS] Speculatively loaded indirect dynamic library: %s\n", fullPath);
 446                                 else
 447                                         logTraceInfo("[Logging for XBS] Used indirect dynamic library: %s\n", fullPath);
 448                         }
 449                         else {
 450                                 logTraceInfo("[Logging for XBS] Used dynamic library: %s\n", fullPath);
 451                         }
 452                 }
 453         }
 454
 455         if ( _options.dumpDependencyInfo() ) {
 456                 const ld::dylib::File* dylib = dynamic_cast<const ld::dylib::File*>(file);
 457                 if ( file == _bundleLoader ) {
 458                         _options.dumpDependency(Options::depBundleLoader, file->path());
 459                 }
 460                 else if ( (dylib != NULL ) && dylib->willBeUpwardDylib() ) {
 461                         if ( indirect )
 462                                 _options.dumpDependency(Options::depUpwardIndirectDylib, file->path());
 463                         else
 464                                 _options.dumpDependency(Options::depUpwardDirectDylib, file->path());
 465                 }
 466                 else {
 467                         if ( indirect )
 468                                 _options.dumpDependency(Options::depIndirectDylib, file->path());
 469                         else
 470                                 _options.dumpDependency(Options::depDirectDylib, file->path());
 471                 }
 472         }
 473 }
 474
 475 void InputFiles::logArchive(ld::File* file) const
 476 {
 477         if ( (_options.traceArchives() || _options.traceEmitJSON()) && (_archiveFilesLogged.count(file) == 0) ) {
 478                 // <rdar://problem/4947347> LD_TRACE_ARCHIVES should only print out when a .o is actually used from an archive
 479                 _archiveFilesLogged.insert(file);
 480                 const char* fullPath = file->path();
 481                 char realName[MAXPATHLEN];
 482                 if ( realpath(fullPath, realName) != NULL )
 483                         fullPath = realName;
 484                 logTraceInfo("[Logging for XBS] Used static archive: %s\n", fullPath);
 485
 486                 std::string archivePath(fullPath);
 487                 _archiveFilePaths.push_back(archivePath);
 488         }
 489 }
 490
 491
 492 void InputFiles::logTraceInfo(const char* format, ...) const
 493 {
 494         char trace_buffer[MAXPATHLEN * 2];
 495     va_list ap;
 496         va_start(ap, format);
 497         int length = vsnprintf(trace_buffer, sizeof(trace_buffer), format, ap);
 498         va_end(ap);
 499         _options.writeToTraceFile(trace_buffer, length);
 500 }
 501
 502
 503 ld::dylib::File* InputFiles::findDylib(const char* installPath, const ld::dylib::File* fromDylib, bool speculative)
 504 {
 505         //fprintf(stderr, "findDylib(%s, %s)\n", installPath, fromPath);
 506         InstallNameToDylib::iterator pos = _installPathToDylibs.find(installPath);
 507         if ( pos != _installPathToDylibs.end() ) {
 508                 return pos->second;
 509         }
 510         else {
 511                 // allow -dylib_path option to override indirect library to use
 512                 for (std::vector<Options::DylibOverride>::const_iterator dit = _options.dylibOverrides().begin(); dit != _options.dylibOverrides().end(); ++dit) {
 513                         if ( strcmp(dit->installName,installPath) == 0 ) {
 514                                 try {
 515                                         Options::FileInfo info = _options.findFile(dit->useInstead);
 516                                         _indirectDylibOrdinal = _indirectDylibOrdinal.nextIndirectDylibOrdinal();
 517                                         info.ordinal = _indirectDylibOrdinal;
 518                                         info.options.fIndirectDylib = true;
 519                                         ld::File* reader = this->makeFile(info, true);
 520                                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 521                                         if ( dylibReader != NULL ) {
 522                                                 addDylib(dylibReader, info);
 523                                                 //_installPathToDylibs[strdup(installPath)] = dylibReader;
 524                                                 this->logDylib(dylibReader, true, speculative);
 525                                                 return dylibReader;
 526                                         }
 527                                         else
 528                                                 throwf("indirect dylib at %s is not a dylib", dit->useInstead);
 529                                 }
 530                                 catch (const char* msg) {
 531                                         warning("ignoring -dylib_file option, %s", msg);
 532                                 }
 533                         }
 534                 }
 535
 536                 // search for dylib using -F and -L paths and expanding @ paths
 537                 Options::FileInfo info = _options.findIndirectDylib(installPath, fromDylib);
 538                 _indirectDylibOrdinal = _indirectDylibOrdinal.nextIndirectDylibOrdinal();
 539                 info.ordinal = _indirectDylibOrdinal;
 540                 info.options.fIndirectDylib = true;
 541                 try {
 542                         ld::File* reader = this->makeFile(info, true);
 543                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 544                         if ( dylibReader != NULL ) {
 545                                 //assert(_installPathToDylibs.find(installPath) !=  _installPathToDylibs.end());
 546                                 //_installPathToDylibs[strdup(installPath)] = dylibReader;
 547                                 addDylib(dylibReader, info);
 548                                 this->logDylib(dylibReader, true, speculative);
 549                                 return dylibReader;
 550                         }
 551                         else
 552                                 throwf("indirect dylib at %s is not a dylib", info.path);
 553                 }
 554                 catch (const char* msg) {
 555                         throwf("in '%s', %s", info.path, msg);
 556                 }
 557         }
 558 }
 559
 560
 561 // mark all dylibs initially specified as required, and check if they can be used
 562 void InputFiles::markExplicitlyLinkedDylibs()
 563 {
 564         for (InstallNameToDylib::iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); it++) {
 565                 it->second->setExplicitlyLinked();
 566                 this->checkDylibClientRestrictions(it->second);
 567         }
 568 }
 569
 570 bool InputFiles::frameworkAlreadyLoaded(const char* path, const char* frameworkName)
 571 {
 572         for (ld::File* file : _inputFiles) {
 573                 if ( strcmp(path, file->path()) == 0 )
 574                         return true;
 575         }
 576         for (ld::dylib::File* dylibx : _allDylibs) {
 577                 const char* fname = dylibx->frameworkName();
 578                 if ( fname == NULL )
 579                         continue;
 580                 if ( strcmp(frameworkName, fname) == 0 )
 581                         return true;
 582         }
 583         return false;
 584 }
 585
 586 bool InputFiles::libraryAlreadyLoaded(const char* path)
 587 {
 588         for (ld::File* file : _inputFiles) {
 589                 if ( strcmp(path, file->path()) == 0 )
 590                         return true;
 591         }
 592         for (ld::dylib::File* dylib : _allDylibs) {
 593                 if ( strcmp(path, dylib->path()) == 0 )
 594                         return true;
 595         }
 596         for (const LibraryInfo& libInfo : _searchLibraries) {
 597                 if ( strcmp(path, libInfo.archive()->path()) == 0 )
 598                         return true;
 599         }
 600
 601         char realDylibPath[PATH_MAX];
 602         if ( (realpath(path, realDylibPath) != NULL) && (strcmp(path, realDylibPath) != 0) ) {
 603                 return libraryAlreadyLoaded(realDylibPath);
 604         }
 605
 606         return false;
 607 }
 608
 609
 610 void InputFiles::addLinkerOptionLibraries(ld::Internal& state, ld::File::AtomHandler& handler)
 611 {
 612         if ( _options.outputKind() == Options::kObjectFile )
 613                 return;
 614
 615         while (! state.unprocessedLinkerOptionLibraries.empty() || ! state.unprocessedLinkerOptionFrameworks.empty()) {
 616
 617                 // process frameworks specified in .o linker options
 618                 CStringSet newFrameworks = std::move(state.unprocessedLinkerOptionFrameworks);
 619                 state.unprocessedLinkerOptionFrameworks.clear();
 620                 for (const char* frameworkName : newFrameworks) {
 621                         if ( state.linkerOptionFrameworks.count(frameworkName) )
 622                                 continue;
 623                         Options::FileInfo info = _options.findFramework(frameworkName);
 624                         if ( ! this->frameworkAlreadyLoaded(info.path, frameworkName) ) {
 625                                 _linkerOptionOrdinal = _linkerOptionOrdinal.nextLinkerOptionOrdinal();
 626                                 info.ordinal = _linkerOptionOrdinal;
 627                                 try {
 628                                         ld::File* reader = this->makeFile(info, true);
 629                                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 630                                         if ( dylibReader != NULL ) {
 631                                                 if ( ! dylibReader->installPathVersionSpecific() ) {
 632                                                         dylibReader->forEachAtom(handler);
 633                                                         dylibReader->setImplicitlyLinked();
 634                                                         dylibReader->setSpeculativelyLoaded();
 635                                                         this->addDylib(dylibReader, info);
 636                                                 }
 637                                         }
 638                                         else {
 639                                                 throwf("framework linker option at %s is not a dylib", info.path);
 640                                         }
 641                                 }
 642                                 catch (const char* msg) {
 643                                         warning("Auto-Linking supplied '%s', %s", info.path, msg);
 644                                 }
 645                         }
 646                         state.linkerOptionFrameworks.insert(frameworkName);
 647                 }
 648
 649                 // process libraries specified in .o linker options
 650                 // fixme optimize with std::move?
 651                 CStringSet newLibraries = std::move(state.unprocessedLinkerOptionLibraries);
 652                 state.unprocessedLinkerOptionLibraries.clear();
 653                 for (const char* libName : newLibraries) {
 654                         if ( state.linkerOptionLibraries.count(libName) )
 655                                 continue;
 656                         Options::FileInfo info = _options.findLibrary(libName);
 657                         if ( ! this->libraryAlreadyLoaded(info.path) ) {
 658                                 _linkerOptionOrdinal = _linkerOptionOrdinal.nextLinkerOptionOrdinal();
 659                                 info.ordinal = _linkerOptionOrdinal;
 660                                 try {
 661                                         //<rdar://problem/17787306> -force_load_swift_libs
 662                                         info.options.fForceLoad = _options.forceLoadSwiftLibs() && (strncmp(libName, "swift", 5) == 0);
 663                                         ld::File* reader = this->makeFile(info, true);
 664                                         ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(reader);
 665                                         ld::archive::File* archiveReader = dynamic_cast<ld::archive::File*>(reader);
 666                                         if ( dylibReader != NULL ) {
 667                                                 dylibReader->forEachAtom(handler);
 668                                                 dylibReader->setImplicitlyLinked();
 669                                                 dylibReader->setSpeculativelyLoaded();
 670                                                 this->addDylib(dylibReader, info);
 671                                         }
 672                                         else if ( archiveReader != NULL ) {
 673                                                 _searchLibraries.push_back(LibraryInfo(archiveReader));
 674                                                 if ( _options.dumpDependencyInfo() )
 675                                                         _options.dumpDependency(Options::depArchive, archiveReader->path());
 676                                                 //<rdar://problem/17787306> -force_load_swift_libs
 677                                                 if (info.options.fForceLoad) {
 678                                                         archiveReader->forEachAtom(handler);
 679                                                 }
 680                                         }
 681                                         else {
 682                                                 throwf("linker option dylib at %s is not a dylib", info.path);
 683                                         }
 684                                 }
 685                                 catch (const char* msg) {
 686                                         warning("Auto-Linking supplied '%s', %s", info.path, msg);
 687                                 }
 688                         }
 689                         state.linkerOptionLibraries.insert(libName);
 690                 }
 691         }
 692 }
 693
 694 void InputFiles::createIndirectDylibs()
 695 {
 696         // keep processing dylibs until no more dylibs are added
 697         unsigned long lastMapSize = 0;
 698         std::set<ld::dylib::File*>  dylibsProcessed;
 699         while ( lastMapSize != _allDylibs.size() ) {
 700                 lastMapSize = _allDylibs.size();
 701                 // can't iterator _installPathToDylibs while modifying it, so use temp buffer
 702                 std::vector<ld::dylib::File*> unprocessedDylibs;
 703                 for (std::set<ld::dylib::File*>::iterator it=_allDylibs.begin(); it != _allDylibs.end(); it++) {
 704                         if ( dylibsProcessed.count(*it) == 0 )
 705                                 unprocessedDylibs.push_back(*it);
 706                 }
 707                 for (std::vector<ld::dylib::File*>::iterator it=unprocessedDylibs.begin(); it != unprocessedDylibs.end(); it++) {
 708                         dylibsProcessed.insert(*it);
 709                         (*it)->processIndirectLibraries(this, _options.implicitlyLinkIndirectPublicDylibs());
 710                 }
 711         }
 712
 713         // go back over original dylibs and mark sub frameworks as re-exported
 714         if ( _options.outputKind() == Options::kDynamicLibrary ) {
 715                 const char* myLeaf = strrchr(_options.installPath(), '/');
 716                 if ( myLeaf != NULL ) {
 717                         for (std::vector<class ld::File*>::const_iterator it=_inputFiles.begin(); it != _inputFiles.end(); it++) {
 718                                 ld::dylib::File* dylibReader = dynamic_cast<ld::dylib::File*>(*it);
 719                                 if ( dylibReader != NULL ) {
 720                                         const char* childParent = dylibReader->parentUmbrella();
 721                                         if ( childParent != NULL ) {
 722                                                 if ( strcmp(childParent, &myLeaf[1]) == 0 ) {
 723                                                         // mark that this dylib will be re-exported
 724                                                         dylibReader->setWillBeReExported();
 725                                                 }
 726                                         }
 727                                 }
 728                         }
 729                 }
 730         }
 731
 732 }
 733
 734 void InputFiles::createOpaqueFileSections()
 735 {
 736         // extra command line sections always at end
 737         for (Options::ExtraSection::const_iterator it=_options.extraSectionsBegin(); it != _options.extraSectionsEnd(); ++it) {
 738                 _inputFiles.push_back(opaque_section::parse(it->segmentName, it->sectionName, it->path, it->data, it->dataLen));
 739                 if ( _options.dumpDependencyInfo() )
 740                         _options.dumpDependency(Options::depSection, it->path);
 741         }
 742
 743 }
 744
 745
 746 void InputFiles::checkDylibClientRestrictions(ld::dylib::File* dylib)
 747 {
 748         // Check for any restrictions on who can link with this dylib
 749         const char* dylibParentName = dylib->parentUmbrella() ;
 750         const std::vector<const char*>* clients = dylib->allowableClients();
 751         if ( (dylibParentName != NULL) || (clients != NULL) ) {
 752                 // only dylibs that are in an umbrella or have a client list need verification
 753                 const char* installName = _options.installPath();
 754                 const char* installNameLastSlash = strrchr(installName, '/');
 755                 bool isParent = false;
 756                 bool isSibling = false;
 757                 bool isAllowableClient = false;
 758                 // There are three cases:
 759                 if ( (dylibParentName != NULL) && (installNameLastSlash != NULL) ) {
 760                         // starts after last slash
 761                         const char* myName = &installNameLastSlash[1];
 762                         unsigned int myNameLen = strlen(myName);
 763                         if ( strncmp(myName, "lib", 3) == 0 )
 764                                 myName = &myName[3];
 765                         // up to first dot
 766                         const char* firstDot = strchr(myName, '.');
 767                         if ( firstDot != NULL )
 768                                 myNameLen = firstDot - myName;
 769                         // up to first underscore
 770                         const char* firstUnderscore = strchr(myName, '_');
 771                         if ( (firstUnderscore != NULL) && ((firstUnderscore - myName) < (int)myNameLen) )
 772                                 myNameLen = firstUnderscore - myName;
 773
 774                         // case 1) The dylib has a parent umbrella, and we are creating the parent umbrella
 775                         isParent = ( (strlen(dylibParentName) == myNameLen) && (strncmp(myName, dylibParentName, myNameLen) == 0) );
 776
 777                         // case 2) The dylib has a parent umbrella, and we are creating a sibling with the same parent
 778                         isSibling = ( (_options.umbrellaName() != NULL) && (strcmp(_options.umbrellaName(), dylibParentName) == 0) );
 779                 }
 780
 781                 if ( !isParent && !isSibling && (clients != NULL) ) {
 782                         // case 3) the dylib has a list of allowable clients, and we are creating one of them
 783                         const char* clientName = _options.clientName();
 784                         int clientNameLen = 0;
 785                         if ( clientName != NULL ) {
 786                                 // use client name as specified on command line
 787                                 clientNameLen = strlen(clientName);
 788                         }
 789                         else {
 790                                 // infer client name from output path (e.g. xxx/libfoo_variant.A.dylib --> foo, Bar.framework/Bar_variant --> Bar)
 791                                 clientName = installName;
 792                                 clientNameLen = strlen(clientName);
 793                                 // starts after last slash
 794                                 if ( installNameLastSlash != NULL )
 795                                         clientName = &installNameLastSlash[1];
 796                                 if ( strncmp(clientName, "lib", 3) == 0 )
 797                                         clientName = &clientName[3];
 798                                 // up to first dot
 799                                 const char* firstDot = strchr(clientName, '.');
 800                                 if ( firstDot != NULL )
 801                                         clientNameLen = firstDot - clientName;
 802                                 // up to first underscore
 803                                 const char* firstUnderscore = strchr(clientName, '_');
 804                                 if ( (firstUnderscore != NULL) && ((firstUnderscore - clientName) < clientNameLen) )
 805                                         clientNameLen = firstUnderscore - clientName;
 806                         }
 807
 808                         // Use clientName to check if this dylib is able to link against the allowable clients.
 809                         for (std::vector<const char*>::const_iterator it = clients->begin(); it != clients->end(); it++) {
 810                                 if ( strncmp(*it, clientName, clientNameLen) == 0 )
 811                                         isAllowableClient = true;
 812                         }
 813                 }
 814
 815                 if ( !isParent && !isSibling && !isAllowableClient ) {
 816                         if ( dylibParentName != NULL ) {
 817                                 throwf("cannot link directly with %s.  Link against the umbrella framework '%s.framework' instead.",
 818                                         dylib->path(), dylibParentName);
 819                         }
 820                         else {
 821                                 throwf("cannot link directly with %s", dylib->path());
 822                         }
 823                 }
 824         }
 825 }
 826
 827
 828 void InputFiles::inferArchitecture(Options& opts, const char** archName)
 829 {
 830         _inferredArch = true;
 831         // scan all input files, looking for a thin .o file.
 832         // the first one found is presumably the architecture to link
 833         uint8_t buffer[4096];
 834         const std::vector<Options::FileInfo>& files = opts.getInputFiles();
 835         for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
 836                 int fd = ::open(it->path, O_RDONLY, 0);
 837                 if ( fd != -1 ) {
 838                         struct stat stat_buf;
 839                         if ( fstat(fd, &stat_buf) != -1) {
 840                                 ssize_t readAmount = stat_buf.st_size;
 841                                 if ( 4096 < readAmount )
 842                                         readAmount = 4096;
 843                                 ssize_t amount = read(fd, buffer, readAmount);
 844                                 ::close(fd);
 845                                 if ( amount >= readAmount ) {
 846                                         cpu_type_t type;
 847                                         cpu_subtype_t subtype;
 848                                         Options::Platform platform;
 849                                         if ( mach_o::relocatable::isObjectFile(buffer, &type, &subtype, &platform) ) {
 850                                                 opts.setArchitecture(type, subtype, platform);
 851                                                 *archName = opts.architectureName();
 852                                                 return;
 853                                         }
 854                                 }
 855                         }
 856                 }
 857         }
 858
 859         // no thin .o files found, so default to same architecture this tool was built as
 860         warning("-arch not specified");
 861 #if __i386__
 862         opts.setArchitecture(CPU_TYPE_I386, CPU_SUBTYPE_X86_ALL, Options::kPlatformOSX);
 863 #elif __x86_64__
 864         opts.setArchitecture(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL, Options::kPlatformOSX);
 865 #elif __arm__
 866         opts.setArchitecture(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6, Options::kPlatformOSX);
 867 #else
 868         #error unknown default architecture
 869 #endif
 870         *archName = opts.architectureName();
 871 }
 872
 873
 874 InputFiles::InputFiles(Options& opts, const char** archName)
 875  : _totalObjectSize(0), _totalArchiveSize(0),
 876    _totalObjectLoaded(0), _totalArchivesLoaded(0), _totalDylibsLoaded(0),
 877         _options(opts), _bundleLoader(NULL),
 878         _inferredArch(false),
 879         _exception(NULL),
 880         _indirectDylibOrdinal(ld::File::Ordinal::indirectDylibBase()),
 881         _linkerOptionOrdinal(ld::File::Ordinal::linkeOptionBase())
 882 {
 883 //      fStartCreateReadersTime = mach_absolute_time();
 884         if ( opts.architecture() == 0 ) {
 885                 // command line missing -arch, so guess arch
 886                 inferArchitecture(opts, archName);
 887         }
 888 #if HAVE_PTHREADS
 889         pthread_mutex_init(&_parseLock, NULL);
 890         pthread_cond_init(&_parseWorkReady, NULL);
 891         pthread_cond_init(&_newFileAvailable, NULL);
 892         _neededFileSlot = -1;
 893 #endif
 894         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
 895         if ( files.size() == 0 )
 896                 throw "no object files specified";
 897
 898         _inputFiles.reserve(files.size());
 899 #if HAVE_PTHREADS
 900         unsigned int inputFileSlot = 0;
 901         _availableInputFiles = 0;
 902         _parseCursor = 0;
 903 #endif
 904         Options::FileInfo* entry;
 905         for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
 906                 entry = (Options::FileInfo*)&(*it);
 907 #if HAVE_PTHREADS
 908                 // Assign input file slots to all the FileInfos.
 909                 // Also chain all FileInfos into one big list to set up for worker threads to do parsing.
 910                 entry->inputFileSlot = inputFileSlot;
 911                 entry->readyToParse = !entry->fromFileList || !_options.pipelineEnabled();
 912                 if (entry->readyToParse)
 913                         _availableInputFiles++;
 914                 _inputFiles.push_back(NULL);
 915                 inputFileSlot++;
 916 #else
 917                 // In the non-threaded case just parse the file now.
 918                 _inputFiles.push_back(makeFile(*entry, false));
 919 #endif
 920         }
 921
 922 #if HAVE_PTHREADS
 923         _remainingInputFiles = files.size();
 924
 925         // initialize info for parsing input files on worker threads
 926         unsigned int ncpus;
 927         int mib[2];
 928         size_t len = sizeof(ncpus);
 929         mib[0] = CTL_HW;
 930         mib[1] = HW_NCPU;
 931         if (sysctl(mib, 2, &ncpus, &len, NULL, 0) != 0) {
 932                 ncpus = 1;
 933         }
 934         _availableWorkers = MIN(ncpus, files.size()); // max # workers we permit
 935         _idleWorkers = 0;
 936
 937         if (_options.pipelineEnabled()) {
 938                 // start up a thread to listen for available input files
 939                 startThread(InputFiles::waitForInputFiles);
 940         }
 941
 942         // Start up one parser thread. More start on demand as parsed input files get consumed.
 943         startThread(InputFiles::parseWorkerThread);
 944         _availableWorkers--;
 945 #else
 946         if (_options.pipelineEnabled()) {
 947                 throwf("pipelined linking not supported on this platform");
 948         }
 949 #endif
 950 }
 951
 952
 953 #if HAVE_PTHREADS
 954 void InputFiles::startThread(void (*threadFunc)(InputFiles *)) const {
 955         pthread_t thread;
 956         pthread_attr_t attr;
 957         pthread_attr_init(&attr);
 958         // set a nice big stack (same as main thread) because some code uses potentially large stack buffers
 959         pthread_attr_setstacksize(&attr, 8 * 1024 * 1024);
 960         pthread_create(&thread, &attr, (void *(*)(void*))threadFunc, (void *)this);
 961         pthread_detach(thread);
 962         pthread_attr_destroy(&attr);
 963 }
 964
 965 // Work loop for input file parsing threads
 966 void InputFiles::parseWorkerThread() {
 967         ld::File *file;
 968         const char *exception = NULL;
 969         pthread_mutex_lock(&_parseLock);
 970         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
 971         if (_s_logPThreads) printf("worker starting\n");
 972         do {
 973                 if (_availableInputFiles == 0) {
 974                         _idleWorkers++;
 975                         pthread_cond_wait(&_parseWorkReady, &_parseLock);
 976                         _idleWorkers--;
 977                 } else {
 978                         int slot = _parseCursor;
 979                         while (slot < (int)files.size() && (_inputFiles[slot] != NULL || !files[slot].readyToParse))
 980                                 slot++;
 981                         assert(slot < (int)files.size());
 982                         Options::FileInfo& entry = (Options::FileInfo&)files[slot];
 983                         _parseCursor = slot+1;
 984                         _availableInputFiles--;
 985                         entry.readyToParse = false; // to avoid multiple threads finding this file
 986                         pthread_mutex_unlock(&_parseLock);
 987                         if (_s_logPThreads) printf("parsing index %u\n", slot);
 988                         try {
 989                                 file = makeFile(entry, false);
 990                         }
 991                         catch (const char *msg) {
 992                                 if ( (strstr(msg, "architecture") != NULL) && !_options.errorOnOtherArchFiles() ) {
 993                                         if ( _options.ignoreOtherArchInputFiles() ) {
 994                                                 // ignore, because this is about an architecture not in use
 995                                         }
 996                                         else {
 997                                                 warning("ignoring file %s, %s", entry.path, msg);
 998                                         }
 999                                 }
1000                                 else if ( strstr(msg, "ignoring unexpected") != NULL ) {
1001                                         warning("%s, %s", entry.path, msg);
1002                                 }
1003                                 else {
1004                                         asprintf((char**)&exception, "%s file '%s'", msg, entry.path);
1005                                 }
1006                                 file = new IgnoredFile(entry.path, entry.modTime, entry.ordinal, ld::File::Other);
1007                         }
1008                         pthread_mutex_lock(&_parseLock);
1009                         if (_remainingInputFiles > 0)
1010                                 _remainingInputFiles--;
1011                         if (_s_logPThreads) printf("done with index %u, %d remaining\n", slot, _remainingInputFiles);
1012                         if (exception) {
1013                                 // We are about to die, so set to zero to stop other threads from doing unneeded work.
1014                                 _remainingInputFiles = 0;
1015                                 _exception = exception;
1016                         }
1017                         else {
1018                                 _inputFiles[slot] = file;
1019                                 if (_neededFileSlot == slot)
1020                                         pthread_cond_signal(&_newFileAvailable);
1021                         }
1022                 }
1023         } while (_remainingInputFiles);
1024         if (_s_logPThreads) printf("worker exiting\n");
1025         pthread_cond_broadcast(&_parseWorkReady);
1026         pthread_cond_signal(&_newFileAvailable);
1027         pthread_mutex_unlock(&_parseLock);
1028 }
1029
1030
1031 void InputFiles::parseWorkerThread(InputFiles *inputFiles) {
1032         inputFiles->parseWorkerThread();
1033 }
1034 #endif
1035
1036
1037 ld::File* InputFiles::addDylib(ld::dylib::File* reader, const Options::FileInfo& info)
1038 {
1039         _allDylibs.insert(reader);
1040
1041         if ( (reader->installPath() == NULL) && !info.options.fBundleLoader ) {
1042                 // this is a "blank" stub
1043                 // silently ignore it
1044                 return reader;
1045         }
1046         // store options about how dylib will be used in dylib itself
1047         if ( info.options.fWeakImport )
1048                 reader->setForcedWeakLinked();
1049         if ( info.options.fReExport )
1050                 reader->setWillBeReExported();
1051         if ( info.options.fUpward ) {
1052                 if ( _options.outputKind() == Options::kDynamicLibrary )
1053                         reader->setWillBeUpwardDylib();
1054                 else
1055                         warning("ignoring upward dylib option for %s\n", info.path);
1056         }
1057         if ( info.options.fLazyLoad )
1058                 reader->setWillBeLazyLoadedDylb();
1059
1060         // add to map of loaded dylibs
1061         const char* installPath = reader->installPath();
1062         if ( installPath != NULL ) {
1063                 InstallNameToDylib::iterator pos = _installPathToDylibs.find(installPath);
1064                 if ( pos == _installPathToDylibs.end() ) {
1065                         _installPathToDylibs[strdup(installPath)] = reader;
1066                 }
1067                 else {
1068                         bool dylibOnCommandLineTwice = ( strcmp(pos->second->path(), reader->path()) == 0 );
1069                         bool isSymlink = false;
1070                         // ignore if this is a symlink to a dylib we've already loaded
1071                         if ( !dylibOnCommandLineTwice ) {
1072                                 char existingDylibPath[PATH_MAX];
1073                                 if ( realpath(pos->second->path(), existingDylibPath) != NULL ) {
1074                                         char newDylibPath[PATH_MAX];
1075                                         if ( realpath(reader->path(), newDylibPath) != NULL ) {
1076                                                 isSymlink = ( strcmp(existingDylibPath, newDylibPath) == 0 );
1077                                         }
1078                                 }
1079                         }
1080                         // remove warning for <rdar://problem/10860629> Same install name for CoreServices and CFNetwork?
1081                         //if ( !dylibOnCommandLineTwice && !isSymlink )
1082                         //      warning("dylibs with same install name: %p %s and %p %s", pos->second, pos->second->path(), reader, reader->path());
1083                 }
1084         }
1085         else if ( info.options.fBundleLoader )
1086                 _bundleLoader = reader;
1087
1088         // log direct readers
1089         if ( ! info.options.fIndirectDylib )
1090                 this->logDylib(reader, false, false);
1091
1092         // update stats
1093         _totalDylibsLoaded++;
1094
1095         // just add direct libraries to search-first list
1096         if ( ! info.options.fIndirectDylib )
1097                 _searchLibraries.push_back(LibraryInfo(reader));
1098
1099         return reader;
1100 }
1101
1102
1103 #if HAVE_PTHREADS
1104 // Called during pipelined linking to listen for available input files.
1105 // Available files are enqueued for parsing.
1106 void InputFiles::waitForInputFiles()
1107 {
1108         if (_s_logPThreads) printf("starting pipeline listener\n");
1109         try {
1110                 const char *fifo = _options.pipelineFifo();
1111                 assert(fifo);
1112                 std::map<const char *, const Options::FileInfo*, strcompclass> fileMap;
1113                 const std::vector<Options::FileInfo>& files = _options.getInputFiles();
1114                 for (std::vector<Options::FileInfo>::const_iterator it = files.begin(); it != files.end(); ++it) {
1115                         const Options::FileInfo& entry = *it;
1116                         if (entry.fromFileList) {
1117                                 fileMap[entry.path] = &entry;
1118                         }
1119                 }
1120                 FILE *fileStream = fopen(fifo, "r");
1121                 if (!fileStream)
1122                         throwf("pipelined linking error - failed to open stream. fopen() returns %s for \"%s\"\n", strerror(errno), fifo);
1123                 while (fileMap.size() > 0) {
1124                         char path_buf[PATH_MAX+1];
1125                         if (fgets(path_buf, PATH_MAX, fileStream) == NULL)
1126                                 throwf("pipelined linking error - %lu missing input files", fileMap.size());
1127                         int len = strlen(path_buf);
1128                         if (path_buf[len-1] == '\n')
1129                                 path_buf[len-1] = 0;
1130                         std::map<const char *, const Options::FileInfo*, strcompclass>::iterator it = fileMap.find(path_buf);
1131                         if (it == fileMap.end())
1132                                 throwf("pipelined linking error - not in file list: %s\n", path_buf);
1133                         Options::FileInfo* inputInfo = (Options::FileInfo*)it->second;
1134                         if (!inputInfo->checkFileExists(_options))
1135                                 throwf("pipelined linking error - file does not exist: %s\n", inputInfo->path);
1136                         pthread_mutex_lock(&_parseLock);
1137                         if (_idleWorkers)
1138                                 pthread_cond_signal(&_parseWorkReady);
1139                         inputInfo->readyToParse = true;
1140                         if (_parseCursor > inputInfo->inputFileSlot)
1141                                 _parseCursor = inputInfo->inputFileSlot;
1142                         _availableInputFiles++;
1143                         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);
1144                         pthread_mutex_unlock(&_parseLock);
1145                         fileMap.erase(it);
1146                 }
1147         } catch (const char *msg) {
1148                 pthread_mutex_lock(&_parseLock);
1149                 _exception = msg;
1150                 pthread_cond_signal(&_newFileAvailable);
1151                 pthread_mutex_unlock(&_parseLock);
1152         }
1153 }
1154
1155
1156 void InputFiles::waitForInputFiles(InputFiles *inputFiles) {
1157         inputFiles->waitForInputFiles();
1158 }
1159 #endif
1160
1161
1162 void InputFiles::forEachInitialAtom(ld::File::AtomHandler& handler, ld::Internal& state)
1163 {
1164         // add all direct object, archives, and dylibs
1165         const std::vector<Options::FileInfo>& files = _options.getInputFiles();
1166         size_t fileIndex;
1167         for (fileIndex=0; fileIndex<_inputFiles.size(); fileIndex++) {
1168                 ld::File *file;
1169 #if HAVE_PTHREADS
1170                 pthread_mutex_lock(&_parseLock);
1171
1172                 // this loop waits for the needed file to be ready (parsed by worker thread)
1173                 while (_inputFiles[fileIndex] == NULL && _exception == NULL) {
1174                         // We are starved for input. If there are still files to parse and we have
1175                         // not maxed out the worker thread count start a new worker thread.
1176                         if (_availableInputFiles > 0 && _availableWorkers > 0) {
1177                                 if (_s_logPThreads) printf("starting worker\n");
1178                                 startThread(InputFiles::parseWorkerThread);
1179                                 _availableWorkers--;
1180                         }
1181                         _neededFileSlot = fileIndex;
1182                         if (_s_logPThreads) printf("consumer blocking for %lu: %s\n", fileIndex, files[fileIndex].path);
1183                         pthread_cond_wait(&_newFileAvailable, &_parseLock);
1184                 }
1185
1186                 if (_exception)
1187                         throw _exception;
1188
1189                 // The input file is parsed. Assimilate it and call its atom iterator.
1190                 if (_s_logPThreads) printf("consuming slot %lu\n", fileIndex);
1191                 file = _inputFiles[fileIndex];
1192                 pthread_mutex_unlock(&_parseLock);
1193 #else
1194                 file = _inputFiles[fileIndex];
1195 #endif
1196                 const Options::FileInfo& info = files[fileIndex];
1197                 switch (file->type()) {
1198                         case ld::File::Reloc:
1199                         {
1200                                 ld::relocatable::File* reloc = (ld::relocatable::File*)file;
1201                                 _options.snapshot().recordObjectFile(reloc->path());
1202                                 if ( _options.dumpDependencyInfo() )
1203                                         _options.dumpDependency(Options::depObjectFile, reloc->path());
1204                         }
1205                                 break;
1206                         case ld::File::Dylib:
1207                         {
1208                                 ld::dylib::File* dylib = (ld::dylib::File*)file;
1209                                 addDylib(dylib, info);
1210                         }
1211                                 break;
1212                         case ld::File::Archive:
1213                         {
1214                                 ld::archive::File* archive = (ld::archive::File*)file;
1215                                 // <rdar://problem/9740166> force loaded archives should be in LD_TRACE
1216                                 if ( (info.options.fForceLoad || _options.fullyLoadArchives()) && (_options.traceArchives() || _options.traceEmitJSON()) )
1217                                         logArchive(archive);
1218
1219                                 if ( isCompilerSupportLib(info.path) && (info.options.fForceLoad || _options.fullyLoadArchives()) )
1220                                         state.forceLoadCompilerRT = true;
1221
1222                                 _searchLibraries.push_back(LibraryInfo(archive));
1223                                 if ( _options.dumpDependencyInfo() )
1224                                         _options.dumpDependency(Options::depArchive, archive->path());
1225                         }
1226                                 break;
1227                         case ld::File::Other:
1228                                 break;
1229                         default:
1230                         {
1231                                 throwf("Unknown file type for %s", file->path());
1232                         }
1233                                 break;
1234                 }
1235                 file->forEachAtom(handler);
1236         }
1237
1238         markExplicitlyLinkedDylibs();
1239         addLinkerOptionLibraries(state, handler);
1240         createIndirectDylibs();
1241         createOpaqueFileSections();
1242
1243         while (fileIndex < _inputFiles.size()) {
1244                 ld::File *file = _inputFiles[fileIndex];
1245                 file->forEachAtom(handler);
1246                 fileIndex++;
1247         }
1248
1249     switch ( _options.outputKind() ) {
1250         case Options::kStaticExecutable:
1251         case Options::kDynamicExecutable:
1252             // add implicit __dso_handle label
1253             handler.doAtom(DSOHandleAtom::_s_atomExecutable);
1254             handler.doAtom(DSOHandleAtom::_s_atomAll);
1255             if ( _options.pageZeroSize() != 0 )
1256                 handler.doAtom(*new PageZeroAtom(_options.pageZeroSize()));
1257             if ( _options.hasCustomStack() && !_options.needsEntryPointLoadCommand() )
1258                 handler.doAtom(*new CustomStackAtom(_options.customStackSize()));
1259             break;
1260         case Options::kDynamicLibrary:
1261             // add implicit __dso_handle label
1262             handler.doAtom(DSOHandleAtom::_s_atomDylib);
1263             handler.doAtom(DSOHandleAtom::_s_atomAll);
1264             break;
1265         case Options::kDynamicBundle:
1266             // add implicit __dso_handle label
1267             handler.doAtom(DSOHandleAtom::_s_atomBundle);
1268             handler.doAtom(DSOHandleAtom::_s_atomAll);
1269             break;
1270         case Options::kDyld:
1271             // add implicit __dso_handle label
1272             handler.doAtom(DSOHandleAtom::_s_atomDyld);
1273             handler.doAtom(DSOHandleAtom::_s_atomAll);
1274             break;
1275         case Options::kPreload:
1276             // add implicit __mh_preload_header label
1277             handler.doAtom(DSOHandleAtom::_s_atomPreload);
1278             // add implicit __dso_handle label, but put it in __text section because
1279             // with -preload the mach_header is no in the address space.
1280             handler.doAtom(DSOHandleAtom::_s_atomPreloadDSO);
1281             break;
1282         case Options::kObjectFile:
1283             handler.doAtom(DSOHandleAtom::_s_atomObjectFile);
1284             break;
1285         case Options::kKextBundle:
1286             // add implicit __dso_handle label
1287             handler.doAtom(DSOHandleAtom::_s_atomAll);
1288             break;
1289         }
1290 }
1291
1292
1293 bool InputFiles::searchLibraries(const char* name, bool searchDylibs, bool searchArchives, bool dataSymbolOnly, ld::File::AtomHandler& handler) const
1294 {
1295         // Check each input library.
1296     for (std::vector<LibraryInfo>::const_iterator it=_searchLibraries.begin(); it != _searchLibraries.end(); ++it) {
1297         LibraryInfo lib = *it;
1298         if (lib.isDylib()) {
1299             if (searchDylibs) {
1300                 ld::dylib::File *dylibFile = lib.dylib();
1301                 //fprintf(stderr, "searchLibraries(%s), looking in linked %s\n", name, dylibFile->path() );
1302                 if ( dylibFile->justInTimeforEachAtom(name, handler) ) {
1303                     // we found a definition in this dylib
1304                     // done, unless it is a weak definition in which case we keep searching
1305                     _options.snapshot().recordDylibSymbol(dylibFile, name);
1306                     if ( !dylibFile->hasWeakExternals() || !dylibFile->hasWeakDefinition(name)) {
1307                         return true;
1308                     }
1309                     // else continue search for a non-weak definition
1310                 }
1311             }
1312         } else {
1313             if (searchArchives) {
1314                 ld::archive::File *archiveFile = lib.archive();
1315                 if ( dataSymbolOnly ) {
1316                     if ( archiveFile->justInTimeDataOnlyforEachAtom(name, handler) ) {
1317                         if ( _options.traceArchives() || _options.traceEmitJSON())
1318                             logArchive(archiveFile);
1319                         _options.snapshot().recordArchive(archiveFile->path());
1320                                                 // DALLAS _state.archives.push_back(archiveFile);
1321                         // found data definition in static library, done
1322                        return true;
1323                     }
1324                 }
1325                 else {
1326                     if ( archiveFile->justInTimeforEachAtom(name, handler) ) {
1327                         if ( _options.traceArchives() || _options.traceEmitJSON())
1328                             logArchive(archiveFile);
1329                         _options.snapshot().recordArchive(archiveFile->path());
1330                         // found definition in static library, done
1331                         return true;
1332                     }
1333                 }
1334             }
1335         }
1336     }
1337
1338         // search indirect dylibs
1339         if ( searchDylibs ) {
1340                 for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1341                         ld::dylib::File* dylibFile = it->second;
1342                         bool searchThisDylib = false;
1343                         if ( _options.nameSpace() == Options::kTwoLevelNameSpace ) {
1344                                 // for two level namesapce, just check all implicitly linked dylibs
1345                                 searchThisDylib = dylibFile->implicitlyLinked() && !dylibFile->explicitlyLinked();
1346                         }
1347                         else {
1348                                 // for flat namespace, check all indirect dylibs
1349                                 searchThisDylib = ! dylibFile->explicitlyLinked();
1350                         }
1351                         if ( searchThisDylib ) {
1352                                 //fprintf(stderr, "searchLibraries(%s), looking in implicitly linked %s\n", name, dylibFile->path() );
1353                                 if ( dylibFile->justInTimeforEachAtom(name, handler) ) {
1354                                         // we found a definition in this dylib
1355                                         // done, unless it is a weak definition in which case we keep searching
1356                     _options.snapshot().recordDylibSymbol(dylibFile, name);
1357                                         if ( !dylibFile->hasWeakExternals() || !dylibFile->hasWeakDefinition(name)) {
1358                                                 return true;
1359                     }
1360                                         // else continue search for a non-weak definition
1361                                 }
1362                         }
1363                 }
1364         }
1365
1366         return false;
1367 }
1368
1369
1370 bool InputFiles::searchWeakDefInDylib(const char* name) const
1371 {
1372         // search all relevant dylibs to see if any have a weak-def with this name
1373         for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1374                 ld::dylib::File* dylibFile = it->second;
1375                 if ( dylibFile->implicitlyLinked() || dylibFile->explicitlyLinked() ) {
1376                         if ( dylibFile->hasWeakExternals() && dylibFile->hasWeakDefinition(name) ) {
1377                                 return true;
1378                         }
1379                 }
1380         }
1381         return false;
1382 }
1383
1384 static bool vectorContains(const std::vector<ld::dylib::File*>& vec, ld::dylib::File* key)
1385 {
1386         return std::find(vec.begin(), vec.end(), key) != vec.end();
1387 }
1388
1389 struct DylibByInstallNameSorter
1390 {
1391          bool operator()(const ld::dylib::File* left, const ld::dylib::File* right)
1392          {
1393           return (strcmp(left->installPath(), right->installPath()) < 0);
1394          }
1395 };
1396
1397 void InputFiles::dylibs(ld::Internal& state)
1398 {
1399         bool dylibsOK = false;
1400         switch ( _options.outputKind() ) {
1401                 case Options::kDynamicExecutable:
1402                 case Options::kDynamicLibrary:
1403                 case Options::kDynamicBundle:
1404                         dylibsOK = true;
1405                         break;
1406                 case Options::kStaticExecutable:
1407                 case Options::kDyld:
1408                 case Options::kPreload:
1409                 case Options::kObjectFile:
1410                 case Options::kKextBundle:
1411                         dylibsOK = false;
1412                         break;
1413         }
1414
1415         // add command line dylibs in order
1416         for (std::vector<ld::File*>::const_iterator it=_inputFiles.begin(); it != _inputFiles.end(); ++it) {
1417                 ld::dylib::File* dylibFile = dynamic_cast<ld::dylib::File*>(*it);
1418                 // only add dylibs that are not "blank" dylib stubs
1419                 if ( (dylibFile != NULL) && ((dylibFile->installPath() != NULL) || (dylibFile == _bundleLoader)) ) {
1420                         if ( dylibsOK ) {
1421                                 if ( ! vectorContains(state.dylibs, dylibFile) ) {
1422                                         state.dylibs.push_back(dylibFile);
1423                                 }
1424                         }
1425                         else
1426                                 warning("unexpected dylib (%s) on link line", dylibFile->path());
1427                 }
1428         }
1429         // add implicitly linked dylibs
1430         if ( _options.nameSpace() == Options::kTwoLevelNameSpace ) {
1431                 std::vector<ld::dylib::File*> implicitDylibs;
1432                 for (InstallNameToDylib::const_iterator it=_installPathToDylibs.begin(); it != _installPathToDylibs.end(); ++it) {
1433                         ld::dylib::File* dylibFile = it->second;
1434                         if ( dylibFile->implicitlyLinked() && dylibsOK ) {
1435                                 if ( ! vectorContains(implicitDylibs, dylibFile) ) {
1436                                         implicitDylibs.push_back(dylibFile);
1437                                 }
1438                         }
1439                 }
1440                 // <rdar://problem/15002251> make implicit dylib order be deterministic by sorting by install_name
1441                 std::sort(implicitDylibs.begin(), implicitDylibs.end(), DylibByInstallNameSorter());
1442
1443                 if ( _options.traceDylibs() ) {
1444                         for (ld::dylib::File* dylib :  implicitDylibs) {
1445                                 if ( dylib->speculativelyLoaded() && !dylib->explicitlyLinked() && dylib->providedExportAtom() ) {
1446                                         const char* fullPath = dylib->path();
1447                                         char realName[MAXPATHLEN];
1448                                         if ( realpath(fullPath, realName) != NULL )
1449                                                 fullPath = realName;
1450                                         logTraceInfo("[Logging for XBS] Used dynamic library: %s\n", fullPath);
1451                                 }
1452                         }
1453                 }
1454                 state.dylibs.insert(state.dylibs.end(), implicitDylibs.begin(), implicitDylibs.end());
1455         }
1456
1457         //fprintf(stderr, "all dylibs:\n");
1458         //for(std::vector<ld::dylib::File*>::iterator it=state.dylibs.begin(); it != state.dylibs.end(); ++it) {
1459         //      const ld::dylib::File* dylib = *it;
1460         //      fprintf(stderr, "    %p impl=%d %s\n", dylib, dylib->implicitlyLinked(), dylib->path());
1461         //}
1462
1463         // and -bundle_loader
1464         state.bundleLoader = _bundleLoader;
1465
1466         // <rdar://problem/10807040> give an error when -nostdlib is used and libSystem is missing
1467         if ( (state.dylibs.size() == 0) && _options.needsEntryPointLoadCommand() )
1468                 throw "dynamic main executables must link with libSystem.dylib";
1469 }
1470
1471 void InputFiles::archives(ld::Internal& state)
1472 {
1473         for (const std::string path :  _archiveFilePaths) {
1474
1475                 state.archivePaths.push_back(path);
1476         }
1477 }
1478
1479
1480 } // namespace tool
1481 } // namespace ld
1482