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Options.cpp
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/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
* Copyright (c) 2005-2011 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <mach/vm_prot.h>
#include <sys/sysctl.h>
#include <mach-o/dyld.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <spawn.h>
#include <cxxabi.h>
#include <Availability.h>
#include <tapi/tapi.h>
#include <vector>
#include <map>
#include <sstream>
#include "ld.hpp"
#include "Options.h"
#include "Architectures.hpp"
#include "MachOFileAbstraction.hpp"
#include "Snapshot.h"
#include "macho_relocatable_file.h"
// from FunctionNameDemangle.h
extern "C" size_t fnd_get_demangled_name(const char *mangledName, char *outputBuffer, size_t length);
#define VAL(x) #x
#define STRINGIFY(x) VAL(x)
// upward dependency on lto::version()
namespace lto {
extern const char* version();
extern unsigned static_api_version();
extern unsigned runtime_api_version();
}
// magic to place command line in crash reports
const int crashreporterBufferSize = 2000;
static char crashreporterBuffer[crashreporterBufferSize];
#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
#include <CrashReporterClient.h>
// hack until ld does not need to build on 10.6 anymore
struct crashreporter_annotations_t gCRAnnotations
__attribute__((section("__DATA," CRASHREPORTER_ANNOTATIONS_SECTION)))
= { CRASHREPORTER_ANNOTATIONS_VERSION, 0, 0, 0, 0, 0, 0 };
#else
extern "C" char* __crashreporter_info__;
__attribute__((used))
char* __crashreporter_info__ = crashreporterBuffer;
#endif
static bool sEmitWarnings = true;
static bool sFatalWarnings = false;
static const char* sWarningsSideFilePath = NULL;
static FILE* sWarningsSideFile = NULL;
static int sWarningsCount = 0;
void warning(const char* format, ...)
{
++sWarningsCount;
if ( sEmitWarnings ) {
va_list list;
if ( sWarningsSideFilePath != NULL ) {
if ( sWarningsSideFile == NULL )
sWarningsSideFile = fopen(sWarningsSideFilePath, "a");
}
va_start(list, format);
fprintf(stderr, "ld: warning: ");
vfprintf(stderr, format, list);
fprintf(stderr, "\n");
if ( sWarningsSideFile != NULL ) {
fprintf(sWarningsSideFile, "ld: warning: ");
vfprintf(sWarningsSideFile, format, list);
fprintf(sWarningsSideFile, "\n");
fflush(sWarningsSideFile);
}
va_end(list);
}
}
void throwf(const char* format, ...)
{
va_list list;
char* p;
va_start(list, format);
vasprintf(&p, format, list);
va_end(list);
const char* t = p;
throw t;
}
bool Options::FileInfo::checkFileExists(const Options& options, const char *p)
{
if (isInlined) {
modTime = 0;
return true;
}
struct stat statBuffer;
if (p == NULL)
p = path;
if ( stat(p, &statBuffer) == 0 ) {
if (p != path) path = strdup(p);
modTime = statBuffer.st_mtime;
return true;
}
options.addDependency(Options::depNotFound, p);
// fprintf(stderr, "not found: %s\n", p);
return false;
}
Options::Options(int argc, const char* argv[])
: fOutputFile("a.out"), fArchitecture(0), fSubArchitecture(0),
fFallbackArchitecture(0), fFallbackSubArchitecture(0), fArchitectureName("unknown"), fOutputKind(kDynamicExecutable),
fHasPreferredSubType(false), fArchSupportsThumb2(false), fBindAtLoad(false), fKeepPrivateExterns(false),
fIgnoreOtherArchFiles(false), fErrorOnOtherArchFiles(false), fForceSubtypeAll(false),
fInterposeMode(kInterposeNone), fDeadStrip(false), fNameSpace(kTwoLevelNameSpace),
fDylibCompatVersion(0), fDylibCurrentVersion(0), fDylibInstallName(NULL), fFinalName(NULL), fEntryName(NULL),
fBaseAddress(0), fMaxAddress(0xFFFFFFFFFFFFFFFFULL),
fBaseWritableAddress(0),
fExportMode(kExportDefault), fLibrarySearchMode(kSearchDylibAndArchiveInEachDir),
fUndefinedTreatment(kUndefinedError), fMessagesPrefixedWithArchitecture(true),
fWeakReferenceMismatchTreatment(kWeakReferenceMismatchNonWeak),
fClientName(NULL),
fUmbrellaName(NULL), fInitFunctionName(NULL), fDotOutputFile(NULL), fExecutablePath(NULL),
fBundleLoader(NULL), fDtraceScriptName(NULL), fMapPath(NULL),
fDyldInstallPath("/usr/lib/dyld"), fLtoCachePath(NULL), fTempLtoObjectPath(NULL), fOverridePathlibLTO(NULL), fLtoCpu(NULL),
fKextObjectsEnable(-1),fKextObjectsDirPath(NULL),fToolchainPath(NULL),fOrderFilePath(NULL),
fZeroPageSize(ULLONG_MAX), fStackSize(0), fStackAddr(0), fSourceVersion(0), fSDKVersion(0), fExecutableStack(false),
fNonExecutableHeap(false), fDisableNonExecutableHeap(false),
fMinimumHeaderPad(32), fSegmentAlignment(LD_PAGE_SIZE),
fCommonsMode(kCommonsIgnoreDylibs), fUUIDMode(kUUIDContent), fLocalSymbolHandling(kLocalSymbolsAll), fWarnCommons(false),
fVerbose(false), fKeepRelocations(false), fWarnStabs(false),
fTraceDylibSearching(false), fPause(false), fStatistics(false), fPrintOptions(false),
fSharedRegionEligible(false), fSharedRegionEligibleForceOff(false), fPrintOrderFileStatistics(false),
fReadOnlyx86Stubs(false), fPositionIndependentExecutable(false), fPIEOnCommandLine(false),
fDisablePositionIndependentExecutable(false), fMaxMinimumHeaderPad(false),
fDeadStripDylibs(false), fAllowTextRelocs(false), fWarnTextRelocs(false), fKextsUseStubs(false),
fUsingLazyDylibLinking(false), fEncryptable(true), fEncryptableForceOn(false), fEncryptableForceOff(false),
fOrderData(true), fMarkDeadStrippableDylib(false),
fMakeCompressedDyldInfo(true), fMakeCompressedDyldInfoForceOff(false),
fMakeThreadedStartsSection(false), fNoEHLabels(false),
fAllowCpuSubtypeMismatches(false), fEnforceDylibSubtypesMatch(false),
fWarnOnSwiftABIVersionMismatches(false), fUseSimplifiedDylibReExports(false),
fObjCABIVersion2Override(false), fObjCABIVersion1Override(false), fCanUseUpwardDylib(false),
fFullyLoadArchives(false), fLoadAllObjcObjectsFromArchives(false), fFlatNamespace(false),
fLinkingMainExecutable(false), fForFinalLinkedImage(false), fForStatic(false),
fForDyld(false), fMakeTentativeDefinitionsReal(false), fWhyLoad(false), fRootSafe(false),
fSetuidSafe(false), fImplicitlyLinkPublicDylibs(true), fAddCompactUnwindEncoding(true),
fWarnCompactUnwind(false), fRemoveDwarfUnwindIfCompactExists(false),
fAutoOrderInitializers(true), fOptimizeZeroFill(true), fMergeZeroFill(false), fLogObjectFiles(false),
fLogAllFiles(false), fTraceDylibs(false), fTraceIndirectDylibs(false), fTraceArchives(false), fTraceEmitJSON(false),
fOutputSlidable(false), fWarnWeakExports(false), fNoWeakExports(false),
fObjcGcCompaction(false), fObjCGc(false), fObjCGcOnly(false),
fDemangle(false), fTLVSupport(false),
fVersionLoadCommand(false), fVersionLoadCommandForcedOn(false),
fVersionLoadCommandForcedOff(false), fForceLegacyVersionLoadCommands(false), fFunctionStartsLoadCommand(false),
fFunctionStartsForcedOn(false), fFunctionStartsForcedOff(false),
fDataInCodeInfoLoadCommand(false), fDataInCodeInfoLoadCommandForcedOn(false), fDataInCodeInfoLoadCommandForcedOff(false),
fCanReExportSymbols(false), fObjcCategoryMerging(true), fPageAlignDataAtoms(false),
fNeedsThreadLoadCommand(false), fEntryPointLoadCommand(false),
fSourceVersionLoadCommand(false),
fSourceVersionLoadCommandForceOn(false), fSourceVersionLoadCommandForceOff(false),
fExportDynamic(false), fAbsoluteSymbols(false),
fAllowSimulatorToLinkWithMacOSX(false), fSimulatorSupportDylib(false), fKeepDwarfUnwind(true),
fKeepDwarfUnwindForcedOn(false), fKeepDwarfUnwindForcedOff(false),
fVerboseOptimizationHints(false), fIgnoreOptimizationHints(false),
fGenerateDtraceDOF(true), fAllowBranchIslands(true), fTraceSymbolLayout(false),
fMarkAppExtensionSafe(false), fCheckAppExtensionSafe(false), fForceLoadSwiftLibs(false),
fSharedRegionEncodingV2(false), fUseDataConstSegment(false),
fUseDataConstSegmentForceOn(false), fUseDataConstSegmentForceOff(false), fUseTextExecSegment(false),
fBundleBitcode(false), fHideSymbols(false), fVerifyBitcode(false),
fReverseMapUUIDRename(false), fDeDupe(true), fVerboseDeDupe(false), fMakeInitializersIntoOffsets(false),
fUseLinkedListBinding(false), fMakeChainedFixups(false), fMakeChainedFixupsSection(false), fNoLazyBinding(false), fDebugVariant(false),
fReverseMapPath(NULL), fLTOCodegenOnly(false),
fIgnoreAutoLink(false), fAllowDeadDups(false), fAllowWeakImports(true), fInitializersTreatment(Options::kInvalid),
fZeroModTimeInDebugMap(false), fBitcodeKind(kBitcodeProcess),
fDebugInfoStripping(kDebugInfoMinimal), fTraceOutputFile(NULL), fPlatfromVersionCmdFound(false), fInternalSDK(false),
fSaveTempFiles(false), fLinkSnapshot(this), fSnapshotRequested(false), fPipelineFifo(NULL),
fDependencyInfoPath(NULL), fBuildContextName(NULL), fTraceFileDescriptor(-1), fMaxDefaultCommonAlign(0),
fUnalignedPointerTreatment(kUnalignedPointerIgnore), fPreferTAPIFile(false), fOSOPrefixPath(NULL)
{
this->checkForClassic(argc, argv);
this->parsePreCommandLineEnvironmentSettings();
this->parse(argc, argv);
this->parsePostCommandLineEnvironmentSettings();
this->reconfigureDefaults();
this->checkIllegalOptionCombinations();
this->addDependency(depOutputFile, fOutputFile);
if ( fMapPath != NULL )
this->addDependency(depOutputFile, fMapPath);
}
Options::~Options()
{
if ( fTraceFileDescriptor != -1 )
::close(fTraceFileDescriptor);
}
bool Options::errorBecauseOfWarnings() const
{
return (sFatalWarnings && (sWarningsCount > 0));
}
const char* Options::installPath() const
{
if ( fDylibInstallName != NULL )
return fDylibInstallName;
else if ( fFinalName != NULL )
return fFinalName;
else
return fOutputFile;
}
bool Options::interposable(const char* name) const
{
switch ( fInterposeMode ) {
case kInterposeNone:
return false;
case kInterposeAllExternal:
return true;
case kInterposeSome:
return fInterposeList.contains(name);
}
throw "internal error";
}
bool Options::printWhyLive(const char* symbolName) const
{
return fWhyLive.contains(symbolName);
}
const char* Options::dotOutputFile()
{
return fDotOutputFile;
}
bool Options::hasWildCardExportRestrictList() const
{
// has -exported_symbols_list which contains some wildcards
return ((fExportMode == kExportSome) && fExportSymbols.hasWildCards());
}
bool Options::hasWeakBitTweaks() const
{
// has -exported_symbols_list which contains some wildcards
return (!fForceWeakSymbols.empty() || !fForceNotWeakSymbols.empty());
}
bool Options::allGlobalsAreDeadStripRoots() const
{
// -exported_symbols_list means globals are not exported by default
if ( fExportMode == kExportSome )
return false;
//
switch ( fOutputKind ) {
case Options::kDynamicExecutable:
// <rdar://problem/12839986> Add the -export_dynamic flag
return fExportDynamic;
case Options::kStaticExecutable:
// <rdar://problem/13361218> Support the -export_dynamic flag for xnu
return fExportDynamic;
case Options::kPreload:
// by default unused globals in a main executable are stripped
return false;
case Options::kDynamicLibrary:
case Options::kDynamicBundle:
case Options::kObjectFile:
case Options::kDyld:
case Options::kKextBundle:
return true;
}
return false;
}
bool Options::dyldLoadsOutput() const
{
switch ( fOutputKind ) {
case Options::kStaticExecutable:
case Options::kPreload:
case Options::kObjectFile:
case Options::kKextBundle:
return false;
case Options::kDynamicExecutable:
case Options::kDynamicLibrary:
case Options::kDynamicBundle:
case Options::kDyld:
return true;
}
}
bool Options::keepRelocations()
{
return fKeepRelocations;
}
bool Options::warnStabs()
{
return fWarnStabs;
}
const char* Options::executablePath()
{
return fExecutablePath;
}
uint32_t Options::initialSegProtection(const char* segName) const
{
for(std::vector<Options::SegmentProtect>::const_iterator it = fCustomSegmentProtections.begin(); it != fCustomSegmentProtections.end(); ++it) {
if ( strcmp(it->name, segName) == 0 ) {
return it->init;
}
}
if ( strcmp(segName, "__TEXT") == 0 ) {
return ( fUseTextExecSegment ? VM_PROT_READ : (VM_PROT_READ | VM_PROT_EXECUTE) );
}
else if ( strcmp(segName, "__TEXT_EXEC") == 0 ) {
return VM_PROT_READ | VM_PROT_EXECUTE;
}
else if ( strcmp(segName, "__PAGEZERO") == 0 ) {
return 0;
}
else if ( strcmp(segName, "__LINKEDIT") == 0 ) {
return VM_PROT_READ;
}
// all others default to read-write
return VM_PROT_READ | VM_PROT_WRITE;
}
bool Options::readOnlyDataSegment(const char* name) const
{
// set SG_READ_ONLY on segment
// but not for shared cache dylibs (because __objc_const is not read-only)
return ( fUseDataConstSegment && (strcmp(name, "__DATA_CONST") == 0) && (!fSharedRegionEligible || (fOutputKind == Options::kDyld)) );
}
uint32_t Options::maxSegProtection(const char* segName) const
{
// i386 uses text-relocations so, need max prot to be rwx. All others have max==init
if ( fArchitecture != CPU_TYPE_I386 )
return initialSegProtection(segName);
for(std::vector<Options::SegmentProtect>::const_iterator it = fCustomSegmentProtections.begin(); it != fCustomSegmentProtections.end(); ++it) {
if ( strcmp(it->name, segName) == 0 ) {
return it->max;
}
}
if ( strcmp(segName, "__PAGEZERO") == 0 ) {
return 0;
}
// all others default to all
return VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
}
uint64_t Options::segPageSize(const char* segName) const
{
for(std::vector<SegmentSize>::const_iterator it=fCustomSegmentSizes.begin(); it != fCustomSegmentSizes.end(); ++it) {
if ( strcmp(it->name, segName) == 0 )
return it->size;
}
return fSegmentAlignment;
}
uint64_t Options::customSegmentAddress(const char* segName) const
{
for(std::vector<SegmentStart>::const_iterator it=fCustomSegmentAddresses.begin(); it != fCustomSegmentAddresses.end(); ++it) {
if ( strcmp(it->name, segName) == 0 )
return it->address;
}
// if custom stack in use, model as segment with custom address
if ( (fStackSize != 0) && (strcmp("__UNIXSTACK", segName) == 0) )
return fStackAddr - fStackSize;
return 0;
}
bool Options::hasCustomSegmentAddress(const char* segName) const
{
for(std::vector<SegmentStart>::const_iterator it=fCustomSegmentAddresses.begin(); it != fCustomSegmentAddresses.end(); ++it) {
if ( strcmp(it->name, segName) == 0 )
return true;
}
// if custom stack in use, model as segment with custom address
if ( (fStackSize != 0) && (strcmp("__UNIXSTACK", segName) == 0) )
return true;
return false;
}
bool Options::hasCustomSectionAlignment(const char* segName, const char* sectName) const
{
for (std::vector<SectionAlignment>::const_iterator it = fSectionAlignments.begin(); it != fSectionAlignments.end(); ++it) {
if ( (strcmp(it->segmentName, segName) == 0) && (strcmp(it->sectionName, sectName) == 0) )
return true;
}
if ( fEncryptable && (strcmp(sectName, "__oslogstring") == 0) && (strcmp(segName, "__TEXT") == 0) )
return true;
return false;
}
uint8_t Options::customSectionAlignment(const char* segName, const char* sectName) const
{
for (std::vector<SectionAlignment>::const_iterator it = fSectionAlignments.begin(); it != fSectionAlignments.end(); ++it) {
if ( (strcmp(it->segmentName, segName) == 0) && (strcmp(it->sectionName, sectName) == 0) )
return it->alignment;
}
if ( fEncryptable && (strcmp(sectName, "__oslogstring") == 0) && (strcmp(segName, "__TEXT") == 0) )
return __builtin_ctz(fSegmentAlignment);
return 0;
}
bool Options::segmentOrderAfterFixedAddressSegment(const char* segName) const
{
bool nowPinned = false;
for (std::vector<const char*>::const_iterator it=fSegmentOrder.begin(); it != fSegmentOrder.end(); ++it) {
if ( strcmp(*it, segName) == 0 )
return nowPinned;
if ( hasCustomSegmentAddress(*it) )
nowPinned = true;
}
return false;
}
bool Options::hasExportedSymbolOrder()
{
return (fExportSymbolsOrder.size() > 0);
}
bool Options::exportedSymbolOrder(const char* sym, unsigned int* order) const
{
NameToOrder::const_iterator pos = fExportSymbolsOrder.find(sym);
if ( pos != fExportSymbolsOrder.end() ) {
*order = pos->second;
return true;
}
else {
*order = 0xFFFFFFFF;
return false;
}
}
void Options::loadSymbolOrderFile(const char* fileOfExports, NameToOrder& orderMapping)
{
// read in whole file
int fd = ::open(fileOfExports, O_RDONLY, 0);
if ( fd == -1 )
throwf("can't open -exported_symbols_order file: %s", fileOfExports);
struct stat stat_buf;
::fstat(fd, &stat_buf);
char* p = (char*)malloc(stat_buf.st_size);
if ( p == NULL )
throwf("can't process -exported_symbols_order file: %s", fileOfExports);
if ( read(fd, p, stat_buf.st_size) != stat_buf.st_size )
throwf("can't read -exported_symbols_order file: %s", fileOfExports);
::close(fd);
// parse into symbols and add to unordered_set
unsigned int count = 0;
char * const end = &p[stat_buf.st_size];
enum { lineStart, inSymbol, inComment } state = lineStart;
char* symbolStart = NULL;
for (char* s = p; s < end; ++s ) {
switch ( state ) {
case lineStart:
if ( *s =='#' ) {
state = inComment;
}
else if ( !isspace(*s) ) {
state = inSymbol;
symbolStart = s;
}
break;
case inSymbol:
if ( (*s == '\n') || (*s == '\r') ) {
*s = '\0';
// removing any trailing spaces
char* last = s-1;
while ( isspace(*last) ) {
*last = '\0';
--last;
}
orderMapping[symbolStart] = ++count;
symbolStart = NULL;
state = lineStart;
}
break;
case inComment:
if ( (*s == '\n') || (*s == '\r') )
state = lineStart;
break;
}
}
if ( state == inSymbol ) {
warning("missing line-end at end of file \"%s\"", fileOfExports);
int len = end-symbolStart+1;
char* temp = new char[len];
strlcpy(temp, symbolStart, len);
// remove any trailing spaces
char* last = &temp[len-2];
while ( isspace(*last) ) {
*last = '\0';
--last;
}
orderMapping[temp] = ++count;
}
// Note: we do not free() the malloc buffer, because the strings are used by the export-set hash table
}
void Options::loadImplictZipperFile(const char *path, std::vector<const char*>& paths)
{
// read in whole file
int fd = ::open(path, O_RDONLY, 0);
if ( fd == -1 ) return; // Early exist if the file is not present
struct stat stat_buf;
::fstat(fd, &stat_buf);
char* p = (char*)malloc(stat_buf.st_size);
if ( p == NULL )
throwf("can't process auto zipper file: %s", path);
if ( read(fd, p, stat_buf.st_size) != stat_buf.st_size )
throwf("can't process auto zipper file: %s", path);
::close(fd);
// parse into paths and add to a vector
char * const end = &p[stat_buf.st_size];
enum { lineStart, inInstallname, inComment } state = lineStart;
char* installnameStart = NULL;
for (char* s = p; s < end; ++s ) {
switch ( state ) {
case lineStart:
if ( *s =='#' ) {
state = inComment;
}
else if ( !isspace(*s) ) {
state = inInstallname;
installnameStart = s;
}
break;
case inInstallname:
if ( (*s == '\n') || (*s == '\r') ) {
*s = '\0';
// removing any trailing spaces
char* last = s-1;
while ( isspace(*last) ) {
*last = '\0';
--last;
}
paths.push_back(installnameStart);
state = lineStart;
}
break;
case inComment:
if ( (*s == '\n') || (*s == '\r') )
state = lineStart;
break;
}
}
if ( state == inInstallname ) {
warning("missing line-end at end of file \"%s\"", path);
int len = end-installnameStart+1;
char* temp = new char[len];
strlcpy(temp, installnameStart, len);
// remove any trailing spaces
char* last = &temp[len-2];
while ( isspace(*last) ) {
*last = '\0';
--last;
}
paths.push_back(installnameStart);
}
// Note: we do not free() the malloc buffer, because the strings are returned out via paths
}
bool Options::forceWeak(const char* symbolName) const
{
return fForceWeakSymbols.contains(symbolName);
}
bool Options::forceNotWeak(const char* symbolName) const
{
return fForceNotWeakSymbols.contains(symbolName);
}
bool Options::forceWeakNonWildCard(const char* symbolName) const
{
return fForceWeakSymbols.containsNonWildcard(symbolName);
}
bool Options::forceNotWeakNonWildcard(const char* symbolName) const
{
return fForceNotWeakSymbols.containsNonWildcard(symbolName);
}
bool Options::forceCoalesce(const char* symbolName) const
{
return fForceCoalesceSymbols.contains(symbolName);
}
bool Options::shouldExport(const char* symbolName) const
{
switch (fExportMode) {
case kExportSome:
return fExportSymbols.contains(symbolName);
case kDontExportSome:
return ! fDontExportSymbols.contains(symbolName);
case kExportDefault:
return true;
}
throw "internal error";
}
bool Options::shouldReExport(const char* symbolName) const
{
return fReExportSymbols.contains(symbolName);
}
bool Options::keepLocalSymbol(const char* symbolName) const
{
switch (fLocalSymbolHandling) {
case kLocalSymbolsAll:
return true;
case kLocalSymbolsNone:
return false;
case kLocalSymbolsSelectiveInclude:
return fLocalSymbolsIncluded.contains(symbolName);
case kLocalSymbolsSelectiveExclude:
return ! fLocalSymbolsExcluded.contains(symbolName);
}
throw "internal error";
}
const std::vector<const char*>* Options::sectionOrder(const char* segName) const
{
for (std::vector<SectionOrderList>::const_iterator it=fSectionOrder.begin(); it != fSectionOrder.end(); ++it) {
if ( strcmp(it->segmentName, segName) == 0 )
return &it->sectionOrder;
}
return NULL;
}
void Options::setInferredArch(cpu_type_t type, cpu_subtype_t subtype)
{
assert(fArchitecture == 0);
for (const ArchInfo* t=archInfoArray; t->archName != NULL; ++t) {
if ( (type == t->cpuType) && (subtype == t->cpuSubType) ) {
fArchitecture = type;
fSubArchitecture = subtype;
fArchitectureName = t->archName;
fHasPreferredSubType = t->isSubType;
fArchSupportsThumb2 = t->supportsThumb2;
#if SUPPORT_ARCH_arm64e
if ( (fArchitecture == CPU_TYPE_ARM64) && (fSubArchitecture == CPU_SUBTYPE_ARM64E) ) {
fSupportsAuthenticatedPointers = true;
}
#endif
break;
}
}
if ( fArchitecture == 0 ) {
// some arch not in our table
fArchitecture = type;
fSubArchitecture = subtype;
fArchitectureName = "unknown";
}
fLinkSnapshot.recordArch(fArchitectureName);
}
void Options::setInferredPlatform(ld::Platform platform, uint32_t minOsVers)
{
assert(platforms().empty());
fPlatforms.insert(ld::PlatformVersion(platform, minOsVers));
// only use compressed LINKEDIT for:
// Mac OS X 10.6 or later
// iOS 3.1 or later
if ( !fMakeCompressedDyldInfo && platforms().minOS(ld::version2009) && !fMakeCompressedDyldInfoForceOff )
fMakeCompressedDyldInfo = true;
// Mac OS X 10.5 and iPhoneOS 2.0 support LC_REEXPORT_DYLIB
if ( platforms().minOS(ld::version2008) )
fUseSimplifiedDylibReExports = true;
}
bool Options::armUsesZeroCostExceptions() const
{
return ( (fArchitecture == CPU_TYPE_ARM) && (fSubArchitecture == CPU_SUBTYPE_ARM_V7K) );
}
void Options::selectFallbackArch(const char *arch)
{
// Should have the format "desired_arch:fallback_arch", for example "arm64_32:armv7k" to allow an armv7k
// slice to substitute for arm64_32 if the latter isn't present.
if (const char* fallbackEnv = getenv("LD_DYLIB_ARCH_FALLBACK") ) {
std::string fallback(fallbackEnv);
auto delimPos = fallback.find(':');
// Check we've got a potentially valid fallback string and that it's this architecture we're falling back from.
if ( delimPos == std::string::npos || fallback.substr(0, delimPos) != arch )
return;
std::string fallbackTo = fallback.substr(delimPos + 1);
for (const ArchInfo *t = archInfoArray; t->archName != nullptr; ++t) {
if ( fallbackTo == t->archName ) {
fFallbackArchitecture = t->cpuType;
fFallbackSubArchitecture = t->cpuSubType;
}
}
}
else {
// <rdar://problem/39797337> let x86_64h fallback and use x86_64 slice
if ( (fArchitecture == CPU_TYPE_X86_64) && (fSubArchitecture == CPU_SUBTYPE_X86_64_H) ) {
fFallbackArchitecture = CPU_TYPE_X86_64;
fFallbackSubArchitecture = CPU_SUBTYPE_X86_ALL;
}
}
}
void Options::parseArch(const char* arch)
{
if ( arch == NULL )
throw "-arch must be followed by an architecture string";
for (const ArchInfo* t=archInfoArray; t->archName != NULL; ++t) {
if ( strcmp(t->archName,arch) == 0 ) {
fArchitectureName = arch;
fArchitecture = t->cpuType;
fSubArchitecture = t->cpuSubType;
fHasPreferredSubType = t->isSubType;
fArchSupportsThumb2 = t->supportsThumb2;
selectFallbackArch(arch);
return;
}
}
throwf("unknown/unsupported architecture name for: -arch %s", arch);
}
bool Options::checkForFile(const char* format, const char* dir, const char* rootName, FileInfo& result) const
{
char possiblePath[strlen(dir)+strlen(rootName)+strlen(format)+8];
sprintf(possiblePath, format, dir, rootName);
bool found = result.checkFileExists(*this, possiblePath);
if ( fTraceDylibSearching )
printf("[Logging for XBS]%sfound library: '%s'\n", (found ? " " : " not "), possiblePath);
return found;
}
Options::FileInfo Options::findLibrary(const char* rootName, bool dylibsOnly) const
{
FileInfo result;
const int rootNameLen = strlen(rootName);
// if rootName ends in .o there is no .a vs .dylib choice
if ( (rootNameLen > 3) && (strcmp(&rootName[rootNameLen-2], ".o") == 0) ) {
for (std::vector<const char*>::const_iterator it = fLibrarySearchPaths.begin();
it != fLibrarySearchPaths.end();
it++) {
const char* dir = *it;
if ( checkForFile("%s/%s", dir, rootName, result) )
return result;
}
}
else {
bool lookForDylibs = false;
switch ( fOutputKind ) {
case Options::kDynamicExecutable:
case Options::kDynamicLibrary:
case Options::kDynamicBundle:
case Options::kObjectFile: // <rdar://problem/15914513>
lookForDylibs = true;
break;
case Options::kStaticExecutable:
case Options::kDyld:
case Options::kPreload:
case Options::kKextBundle:
lookForDylibs = false;
break;
}
switch ( fLibrarySearchMode ) {
case kSearchAllDirsForDylibsThenAllDirsForArchives:
// first look in all directories for just for dylibs
if ( lookForDylibs ) {
for (std::vector<const char*>::const_iterator it = fLibrarySearchPaths.begin();
it != fLibrarySearchPaths.end();
it++) {
const char* dir = *it;
auto path = std::string(dir) + "/lib" + rootName + ".dylib";
if ( findFile(path, {".tbd"}, result) )
return result;
}
for (std::vector<const char*>::const_iterator it = fLibrarySearchPaths.begin();
it != fLibrarySearchPaths.end();
it++) {
const char* dir = *it;
if ( checkForFile("%s/lib%s.so", dir, rootName, result) )
return result;
}
}
// next look in all directories for just for archives
if ( !dylibsOnly ) {
for (std::vector<const char*>::const_iterator it = fLibrarySearchPaths.begin();
it != fLibrarySearchPaths.end();
it++) {
const char* dir = *it;
if ( checkForFile("%s/lib%s.a", dir, rootName, result) )
return result;
}
}
break;
case kSearchDylibAndArchiveInEachDir:
// look in each directory for just for a dylib then for an archive
for (std::vector<const char*>::const_iterator it = fLibrarySearchPaths.begin();
it != fLibrarySearchPaths.end();
it++) {
const char* dir = *it;
auto path = std::string(dir) + "/lib" + rootName + ".dylib";
if ( lookForDylibs && findFile(path, {".tbd"}, result) )
return result;
if ( lookForDylibs && checkForFile("%s/lib%s.so", dir, rootName, result) )
return result;
if ( !dylibsOnly && checkForFile("%s/lib%s.a", dir, rootName, result) )
return result;
}
break;
}
}
throwf("library not found for -l%s", rootName);
}
Options::FileInfo Options::findFramework(const char* frameworkName) const
{
if ( frameworkName == NULL )
throw "-framework missing next argument";
char temp[strlen(frameworkName)+1];
strcpy(temp, frameworkName);
const char* name = temp;
const char* suffix = NULL;
char* comma = strchr(temp, ',');
if ( comma != NULL ) {
*comma = '\0';
suffix = &comma[1];
}
return findFramework(name, suffix);
}
Options::FileInfo Options::findFramework(const char* rootName, const char* suffix) const
{
for (const auto* path : fFrameworkSearchPaths) {
auto possiblePath = std::string(path).append("/").append(rootName).append(".framework/").append(rootName);
if ( suffix != nullptr ) {
char realPath[PATH_MAX];
// no symlink in framework to suffix variants, so follow main symlink
if ( realpath(possiblePath.c_str(), realPath) != nullptr )
possiblePath = std::string(realPath).append(suffix);
}
FileInfo result;
if ( findFile(possiblePath, {".tbd"}, result) )
return result;
}
// try without suffix
if ( suffix != NULL )
return findFramework(rootName, NULL);
else
throwf("framework not found %s", rootName);
}
static std::string replace_extension(const std::string &path, const std::string &ext)
{
auto result = path;
auto lastSlashIdx = result.find_last_of('/');
auto lastDotIdx = result.find_last_of('.');
if (lastDotIdx != std::string::npos && lastDotIdx > lastSlashIdx)
result.erase(lastDotIdx, std::string::npos);
if ( ext.size() > 0 && ext[0] == '.' )
result.append(ext);
else
result.append('.' + ext);
return result;
}
void Options::addTAPIInterface(tapi::LinkerInterfaceFile* interface, const char *path) const {
#if ((TAPI_API_VERSION_MAJOR == 1 && TAPI_API_VERSION_MINOR >= 3) || (TAPI_API_VERSION_MAJOR > 1))
if (tapi::APIVersion::isAtLeast(1, 3)) {
for (auto &name : interface->inlinedFrameworkNames()) {
fTAPIFiles.emplace_back(interface, path, name.c_str());
}
}
#endif
}
bool Options::findFile(const std::string &path, const std::vector<std::string> &tbdExtensions, FileInfo& result) const
{
FileInfo tbdInfo;
for ( const auto &ext : tbdExtensions ) {
auto newPath = replace_extension(path, ext);
bool found = tbdInfo.checkFileExists(*this, newPath.c_str());
if ( fTraceDylibSearching )
printf("[Logging for XBS]%sfound library: '%s'\n", (found ? " " : " not "), newPath.c_str());
if ( found )
break;
}
FileInfo dylibInfo;
{
bool found = dylibInfo.checkFileExists(*this, path.c_str());
if ( fTraceDylibSearching )
printf("[Logging for XBS]%sfound library: '%s'\n", (found ? " " : " not "), path.c_str());
}
// There is only a text-based stub file or a dynamic library file.
if ( tbdInfo.missing() != dylibInfo.missing() ) {
result = tbdInfo.missing() ? dylibInfo : tbdInfo;
}
// There are both - a text-based stub file and a dynamic library file.
else if ( !tbdInfo.missing() && !dylibInfo.missing() ) {
// Check if we should prefer the text-based stub file (env var).
if (fPreferTAPIFile) {
result = tbdInfo;
}
// Check if we should prefer the text-based stub file (installapi).
else if (tapi::LinkerInterfaceFile::shouldPreferTextBasedStubFile(tbdInfo.path)) {
result = tbdInfo;
}
// If the files are still in sync we can use and should use the text-based stub file.
else if (tapi::LinkerInterfaceFile::areEquivalent(tbdInfo.path, dylibInfo.path)) {
result = tbdInfo;
}
// Otherwise issue a warning and fall-back to the dynamic library file.
else {
// <rdar://problem/48850374> Suppress warnings about iOSHostAdditions until mastering is fixed (rdar://46486148)
if ( strstr(tbdInfo.path, "/SDKs/iOSHostAdditions") == NULL )
warning("text-based stub file %s and library file %s are out of sync. Falling back to library file for linking.", tbdInfo.path, dylibInfo.path);
result = dylibInfo;
}
} else {
return false;
}
return true;
}
static bool startsWith(const std::string& str, const std::string& prefix)
{
return (str.compare(0, prefix.length(), prefix) == 0);
}
static std::string getDirPath(const std::string& path)
{
std::string::size_type lastSlashPos = path.find_last_of('/');
if ( lastSlashPos == std::string::npos )
return "./";
else
return path.substr(0, lastSlashPos+1);
}
Options::FileInfo Options::findFile(const std::string &path, const ld::dylib::File* fromDylib) const
{