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Darwin.cpp
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//===--- Darwin.cpp - Darwin Tool and ToolChain Implementations -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Darwin.h"
#include "Arch/AArch64.h"
#include "Arch/ARM.h"
#include "CommonArgs.h"
#include "clang/Basic/AlignedAllocation.h"
#include "clang/Basic/ObjCRuntime.h"
#include "clang/Config/config.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/SanitizerArgs.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Option/ArgList.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/Support/TargetParser.h"
#include "llvm/Support/Threading.h"
#include "llvm/Support/VirtualFileSystem.h"
#include <cstdlib> // ::getenv
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang::driver::toolchains;
using namespace clang;
using namespace llvm::opt;
static VersionTuple minimumMacCatalystDeploymentTarget() {
return VersionTuple(13, 1);
}
llvm::Triple::ArchType darwin::getArchTypeForMachOArchName(StringRef Str) {
// See arch(3) and llvm-gcc's driver-driver.c. We don't implement support for
// archs which Darwin doesn't use.
// The matching this routine does is fairly pointless, since it is neither the
// complete architecture list, nor a reasonable subset. The problem is that
// historically the driver driver accepts this and also ties its -march=
// handling to the architecture name, so we need to be careful before removing
// support for it.
// This code must be kept in sync with Clang's Darwin specific argument
// translation.
return llvm::StringSwitch<llvm::Triple::ArchType>(Str)
.Cases("ppc", "ppc601", "ppc603", "ppc604", "ppc604e", llvm::Triple::ppc)
.Cases("ppc750", "ppc7400", "ppc7450", "ppc970", llvm::Triple::ppc)
.Case("ppc64", llvm::Triple::ppc64)
.Cases("i386", "i486", "i486SX", "i586", "i686", llvm::Triple::x86)
.Cases("pentium", "pentpro", "pentIIm3", "pentIIm5", "pentium4",
llvm::Triple::x86)
.Cases("x86_64", "x86_64h", llvm::Triple::x86_64)
// This is derived from the driver driver.
.Cases("arm", "armv4t", "armv5", "armv6", "armv6m", llvm::Triple::arm)
.Cases("armv7", "armv7em", "armv7k", "armv7m", llvm::Triple::arm)
.Cases("armv7s", "xscale", llvm::Triple::arm)
.Cases("arm64", "arm64e", llvm::Triple::aarch64)
.Case("arm64_32", llvm::Triple::aarch64_32)
.Case("r600", llvm::Triple::r600)
.Case("amdgcn", llvm::Triple::amdgcn)
.Case("nvptx", llvm::Triple::nvptx)
.Case("nvptx64", llvm::Triple::nvptx64)
.Case("amdil", llvm::Triple::amdil)
.Case("spir", llvm::Triple::spir)
.Default(llvm::Triple::UnknownArch);
}
void darwin::setTripleTypeForMachOArchName(llvm::Triple &T, StringRef Str) {
const llvm::Triple::ArchType Arch = getArchTypeForMachOArchName(Str);
llvm::ARM::ArchKind ArchKind = llvm::ARM::parseArch(Str);
T.setArch(Arch);
if (Arch != llvm::Triple::UnknownArch)
T.setArchName(Str);
if (ArchKind == llvm::ARM::ArchKind::ARMV6M ||
ArchKind == llvm::ARM::ArchKind::ARMV7M ||
ArchKind == llvm::ARM::ArchKind::ARMV7EM) {
T.setOS(llvm::Triple::UnknownOS);
T.setObjectFormat(llvm::Triple::MachO);
}
}
void darwin::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const llvm::Triple &T(getToolChain().getTriple());
ArgStringList CmdArgs;
assert(Inputs.size() == 1 && "Unexpected number of inputs.");
const InputInfo &Input = Inputs[0];
// Determine the original source input.
const Action *SourceAction = &JA;
while (SourceAction->getKind() != Action::InputClass) {
assert(!SourceAction->getInputs().empty() && "unexpected root action!");
SourceAction = SourceAction->getInputs()[0];
}
// If -fno-integrated-as is used add -Q to the darwin assembler driver to make
// sure it runs its system assembler not clang's integrated assembler.
// Applicable to darwin11+ and Xcode 4+. darwin<10 lacked integrated-as.
// FIXME: at run-time detect assembler capabilities or rely on version
// information forwarded by -target-assembler-version.
if (Args.hasArg(options::OPT_fno_integrated_as)) {
if (!(T.isMacOSX() && T.isMacOSXVersionLT(10, 7)))
CmdArgs.push_back("-Q");
}
// Forward -g, assuming we are dealing with an actual assembly file.
if (SourceAction->getType() == types::TY_Asm ||
SourceAction->getType() == types::TY_PP_Asm) {
if (Args.hasArg(options::OPT_gstabs))
CmdArgs.push_back("--gstabs");
else if (Args.hasArg(options::OPT_g_Group))
CmdArgs.push_back("-g");
}
// Derived from asm spec.
AddMachOArch(Args, CmdArgs);
// Use -force_cpusubtype_ALL on x86 by default.
if (T.isX86() || Args.hasArg(options::OPT_force__cpusubtype__ALL))
CmdArgs.push_back("-force_cpusubtype_ALL");
if (getToolChain().getArch() != llvm::Triple::x86_64 &&
(((Args.hasArg(options::OPT_mkernel) ||
Args.hasArg(options::OPT_fapple_kext)) &&
getMachOToolChain().isKernelStatic()) ||
Args.hasArg(options::OPT_static)))
CmdArgs.push_back("-static");
Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
assert(Output.isFilename() && "Unexpected lipo output.");
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
assert(Input.isFilename() && "Invalid input.");
CmdArgs.push_back(Input.getFilename());
// asm_final spec is empty.
const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
Exec, CmdArgs, Inputs, Output));
}
void darwin::MachOTool::anchor() {}
void darwin::MachOTool::AddMachOArch(const ArgList &Args,
ArgStringList &CmdArgs) const {
StringRef ArchName = getMachOToolChain().getMachOArchName(Args);
// Derived from darwin_arch spec.
CmdArgs.push_back("-arch");
CmdArgs.push_back(Args.MakeArgString(ArchName));
// FIXME: Is this needed anymore?
if (ArchName == "arm")
CmdArgs.push_back("-force_cpusubtype_ALL");
}
bool darwin::Linker::NeedsTempPath(const InputInfoList &Inputs) const {
// We only need to generate a temp path for LTO if we aren't compiling object
// files. When compiling source files, we run 'dsymutil' after linking. We
// don't run 'dsymutil' when compiling object files.
for (const auto &Input : Inputs)
if (Input.getType() != types::TY_Object)
return true;
return false;
}
/// Pass -no_deduplicate to ld64 under certain conditions:
///
/// - Either -O0 or -O1 is explicitly specified
/// - No -O option is specified *and* this is a compile+link (implicit -O0)
///
/// Also do *not* add -no_deduplicate when no -O option is specified and this
/// is just a link (we can't imply -O0)
static bool shouldLinkerNotDedup(bool IsLinkerOnlyAction, const ArgList &Args) {
if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
if (A->getOption().matches(options::OPT_O0))
return true;
if (A->getOption().matches(options::OPT_O))
return llvm::StringSwitch<bool>(A->getValue())
.Case("1", true)
.Default(false);
return false; // OPT_Ofast & OPT_O4
}
if (!IsLinkerOnlyAction) // Implicit -O0 for compile+linker only.
return true;
return false;
}
void darwin::Linker::AddLinkArgs(Compilation &C, const ArgList &Args,
ArgStringList &CmdArgs,
const InputInfoList &Inputs,
VersionTuple Version, bool LinkerIsLLD) const {
const Driver &D = getToolChain().getDriver();
const toolchains::MachO &MachOTC = getMachOToolChain();
// Newer linkers support -demangle. Pass it if supported and not disabled by
// the user.
if ((Version >= VersionTuple(100) || LinkerIsLLD) &&
!Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
CmdArgs.push_back("-demangle");
if (Args.hasArg(options::OPT_rdynamic) &&
(Version >= VersionTuple(137) || LinkerIsLLD))
CmdArgs.push_back("-export_dynamic");
// If we are using App Extension restrictions, pass a flag to the linker
// telling it that the compiled code has been audited.
if (Args.hasFlag(options::OPT_fapplication_extension,
options::OPT_fno_application_extension, false))
CmdArgs.push_back("-application_extension");
if (D.isUsingLTO() && (Version >= VersionTuple(116) || LinkerIsLLD) &&
NeedsTempPath(Inputs)) {
std::string TmpPathName;
if (D.getLTOMode() == LTOK_Full) {
// If we are using full LTO, then automatically create a temporary file
// path for the linker to use, so that it's lifetime will extend past a
// possible dsymutil step.
TmpPathName =
D.GetTemporaryPath("cc", types::getTypeTempSuffix(types::TY_Object));
} else if (D.getLTOMode() == LTOK_Thin)
// If we are using thin LTO, then create a directory instead.
TmpPathName = D.GetTemporaryDirectory("thinlto");
if (!TmpPathName.empty()) {
auto *TmpPath = C.getArgs().MakeArgString(TmpPathName);
C.addTempFile(TmpPath);
CmdArgs.push_back("-object_path_lto");
CmdArgs.push_back(TmpPath);
}
}
// Use -lto_library option to specify the libLTO.dylib path. Try to find
// it in clang installed libraries. ld64 will only look at this argument
// when it actually uses LTO, so libLTO.dylib only needs to exist at link
// time if ld64 decides that it needs to use LTO.
// Since this is passed unconditionally, ld64 will never look for libLTO.dylib
// next to it. That's ok since ld64 using a libLTO.dylib not matching the
// clang version won't work anyways.
// lld is built at the same revision as clang and statically links in
// LLVM libraries, so it doesn't need libLTO.dylib.
if (Version >= VersionTuple(133) && !LinkerIsLLD) {
// Search for libLTO in <InstalledDir>/../lib/libLTO.dylib
StringRef P = llvm::sys::path::parent_path(D.Dir);
SmallString<128> LibLTOPath(P);
llvm::sys::path::append(LibLTOPath, "lib");
llvm::sys::path::append(LibLTOPath, "libLTO.dylib");
CmdArgs.push_back("-lto_library");
CmdArgs.push_back(C.getArgs().MakeArgString(LibLTOPath));
}
// ld64 version 262 and above runs the deduplicate pass by default.
// FIXME: lld doesn't dedup by default. Should we pass `--icf=safe`
// if `!shouldLinkerNotDedup()` if LinkerIsLLD here?
if (Version >= VersionTuple(262) &&
shouldLinkerNotDedup(C.getJobs().empty(), Args))
CmdArgs.push_back("-no_deduplicate");
// Derived from the "link" spec.
Args.AddAllArgs(CmdArgs, options::OPT_static);
if (!Args.hasArg(options::OPT_static))
CmdArgs.push_back("-dynamic");
if (Args.hasArg(options::OPT_fgnu_runtime)) {
// FIXME: gcc replaces -lobjc in forward args with -lobjc-gnu
// here. How do we wish to handle such things?
}
if (!Args.hasArg(options::OPT_dynamiclib)) {
AddMachOArch(Args, CmdArgs);
// FIXME: Why do this only on this path?
Args.AddLastArg(CmdArgs, options::OPT_force__cpusubtype__ALL);
Args.AddLastArg(CmdArgs, options::OPT_bundle);
Args.AddAllArgs(CmdArgs, options::OPT_bundle__loader);
Args.AddAllArgs(CmdArgs, options::OPT_client__name);
Arg *A;
if ((A = Args.getLastArg(options::OPT_compatibility__version)) ||
(A = Args.getLastArg(options::OPT_current__version)) ||
(A = Args.getLastArg(options::OPT_install__name)))
D.Diag(diag::err_drv_argument_only_allowed_with) << A->getAsString(Args)
<< "-dynamiclib";
Args.AddLastArg(CmdArgs, options::OPT_force__flat__namespace);
Args.AddLastArg(CmdArgs, options::OPT_keep__private__externs);
Args.AddLastArg(CmdArgs, options::OPT_private__bundle);
} else {
CmdArgs.push_back("-dylib");
Arg *A;
if ((A = Args.getLastArg(options::OPT_bundle)) ||
(A = Args.getLastArg(options::OPT_bundle__loader)) ||
(A = Args.getLastArg(options::OPT_client__name)) ||
(A = Args.getLastArg(options::OPT_force__flat__namespace)) ||
(A = Args.getLastArg(options::OPT_keep__private__externs)) ||
(A = Args.getLastArg(options::OPT_private__bundle)))
D.Diag(diag::err_drv_argument_not_allowed_with) << A->getAsString(Args)
<< "-dynamiclib";
Args.AddAllArgsTranslated(CmdArgs, options::OPT_compatibility__version,
"-dylib_compatibility_version");
Args.AddAllArgsTranslated(CmdArgs, options::OPT_current__version,
"-dylib_current_version");
AddMachOArch(Args, CmdArgs);
Args.AddAllArgsTranslated(CmdArgs, options::OPT_install__name,
"-dylib_install_name");
}
Args.AddLastArg(CmdArgs, options::OPT_all__load);
Args.AddAllArgs(CmdArgs, options::OPT_allowable__client);
Args.AddLastArg(CmdArgs, options::OPT_bind__at__load);
if (MachOTC.isTargetIOSBased())
Args.AddLastArg(CmdArgs, options::OPT_arch__errors__fatal);
Args.AddLastArg(CmdArgs, options::OPT_dead__strip);
Args.AddLastArg(CmdArgs, options::OPT_no__dead__strip__inits__and__terms);
Args.AddAllArgs(CmdArgs, options::OPT_dylib__file);
Args.AddLastArg(CmdArgs, options::OPT_dynamic);
Args.AddAllArgs(CmdArgs, options::OPT_exported__symbols__list);
Args.AddLastArg(CmdArgs, options::OPT_flat__namespace);
Args.AddAllArgs(CmdArgs, options::OPT_force__load);
Args.AddAllArgs(CmdArgs, options::OPT_headerpad__max__install__names);
Args.AddAllArgs(CmdArgs, options::OPT_image__base);
Args.AddAllArgs(CmdArgs, options::OPT_init);
// Add the deployment target.
if (Version >= VersionTuple(520) || LinkerIsLLD)
MachOTC.addPlatformVersionArgs(Args, CmdArgs);
else
MachOTC.addMinVersionArgs(Args, CmdArgs);
Args.AddLastArg(CmdArgs, options::OPT_nomultidefs);
Args.AddLastArg(CmdArgs, options::OPT_multi__module);
Args.AddLastArg(CmdArgs, options::OPT_single__module);
Args.AddAllArgs(CmdArgs, options::OPT_multiply__defined);
Args.AddAllArgs(CmdArgs, options::OPT_multiply__defined__unused);
if (const Arg *A =
Args.getLastArg(options::OPT_fpie, options::OPT_fPIE,
options::OPT_fno_pie, options::OPT_fno_PIE)) {
if (A->getOption().matches(options::OPT_fpie) ||
A->getOption().matches(options::OPT_fPIE))
CmdArgs.push_back("-pie");
else
CmdArgs.push_back("-no_pie");
}
// for embed-bitcode, use -bitcode_bundle in linker command
if (C.getDriver().embedBitcodeEnabled()) {
// Check if the toolchain supports bitcode build flow.
if (MachOTC.SupportsEmbeddedBitcode()) {
CmdArgs.push_back("-bitcode_bundle");
// FIXME: Pass this if LinkerIsLLD too, once it implements this flag.
if (C.getDriver().embedBitcodeMarkerOnly() &&
Version >= VersionTuple(278)) {
CmdArgs.push_back("-bitcode_process_mode");
CmdArgs.push_back("marker");
}
} else
D.Diag(diag::err_drv_bitcode_unsupported_on_toolchain);
}
// If GlobalISel is enabled, pass it through to LLVM.
if (Arg *A = Args.getLastArg(options::OPT_fglobal_isel,
options::OPT_fno_global_isel)) {
if (A->getOption().matches(options::OPT_fglobal_isel)) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-global-isel");
// Disable abort and fall back to SDAG silently.
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-global-isel-abort=0");
}
}
Args.AddLastArg(CmdArgs, options::OPT_prebind);
Args.AddLastArg(CmdArgs, options::OPT_noprebind);
Args.AddLastArg(CmdArgs, options::OPT_nofixprebinding);
Args.AddLastArg(CmdArgs, options::OPT_prebind__all__twolevel__modules);
Args.AddLastArg(CmdArgs, options::OPT_read__only__relocs);
Args.AddAllArgs(CmdArgs, options::OPT_sectcreate);
Args.AddAllArgs(CmdArgs, options::OPT_sectorder);
Args.AddAllArgs(CmdArgs, options::OPT_seg1addr);
Args.AddAllArgs(CmdArgs, options::OPT_segprot);
Args.AddAllArgs(CmdArgs, options::OPT_segaddr);
Args.AddAllArgs(CmdArgs, options::OPT_segs__read__only__addr);
Args.AddAllArgs(CmdArgs, options::OPT_segs__read__write__addr);
Args.AddAllArgs(CmdArgs, options::OPT_seg__addr__table);
Args.AddAllArgs(CmdArgs, options::OPT_seg__addr__table__filename);
Args.AddAllArgs(CmdArgs, options::OPT_sub__library);
Args.AddAllArgs(CmdArgs, options::OPT_sub__umbrella);
// Give --sysroot= preference, over the Apple specific behavior to also use
// --isysroot as the syslibroot.
StringRef sysroot = C.getSysRoot();
if (sysroot != "") {
CmdArgs.push_back("-syslibroot");
CmdArgs.push_back(C.getArgs().MakeArgString(sysroot));
} else if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
CmdArgs.push_back("-syslibroot");
CmdArgs.push_back(A->getValue());
}
Args.AddLastArg(CmdArgs, options::OPT_twolevel__namespace);
Args.AddLastArg(CmdArgs, options::OPT_twolevel__namespace__hints);
Args.AddAllArgs(CmdArgs, options::OPT_umbrella);
Args.AddAllArgs(CmdArgs, options::OPT_undefined);
Args.AddAllArgs(CmdArgs, options::OPT_unexported__symbols__list);
Args.AddAllArgs(CmdArgs, options::OPT_weak__reference__mismatches);
Args.AddLastArg(CmdArgs, options::OPT_X_Flag);
Args.AddAllArgs(CmdArgs, options::OPT_y);
Args.AddLastArg(CmdArgs, options::OPT_w);
Args.AddAllArgs(CmdArgs, options::OPT_pagezero__size);
Args.AddAllArgs(CmdArgs, options::OPT_segs__read__);
Args.AddLastArg(CmdArgs, options::OPT_seglinkedit);
Args.AddLastArg(CmdArgs, options::OPT_noseglinkedit);
Args.AddAllArgs(CmdArgs, options::OPT_sectalign);
Args.AddAllArgs(CmdArgs, options::OPT_sectobjectsymbols);
Args.AddAllArgs(CmdArgs, options::OPT_segcreate);
Args.AddLastArg(CmdArgs, options::OPT_why_load);
Args.AddLastArg(CmdArgs, options::OPT_whatsloaded);
Args.AddAllArgs(CmdArgs, options::OPT_dylinker__install__name);
Args.AddLastArg(CmdArgs, options::OPT_dylinker);
Args.AddLastArg(CmdArgs, options::OPT_Mach);
}
/// Determine whether we are linking the ObjC runtime.
static bool isObjCRuntimeLinked(const ArgList &Args) {
if (isObjCAutoRefCount(Args)) {
Args.ClaimAllArgs(options::OPT_fobjc_link_runtime);
return true;
}
return Args.hasArg(options::OPT_fobjc_link_runtime);
}
static bool checkRemarksOptions(const Driver &D, const ArgList &Args,
const llvm::Triple &Triple) {
// When enabling remarks, we need to error if:
// * The remark file is specified but we're targeting multiple architectures,
// which means more than one remark file is being generated.
bool hasMultipleInvocations =
Args.getAllArgValues(options::OPT_arch).size() > 1;
bool hasExplicitOutputFile =
Args.getLastArg(options::OPT_foptimization_record_file_EQ);
if (hasMultipleInvocations && hasExplicitOutputFile) {
D.Diag(diag::err_drv_invalid_output_with_multiple_archs)
<< "-foptimization-record-file";
return false;
}
return true;
}
static void renderRemarksOptions(const ArgList &Args, ArgStringList &CmdArgs,
const llvm::Triple &Triple,
const InputInfo &Output, const JobAction &JA) {
StringRef Format = "yaml";
if (const Arg *A = Args.getLastArg(options::OPT_fsave_optimization_record_EQ))
Format = A->getValue();
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-lto-pass-remarks-output");
CmdArgs.push_back("-mllvm");
const Arg *A = Args.getLastArg(options::OPT_foptimization_record_file_EQ);
if (A) {
CmdArgs.push_back(A->getValue());
} else {
assert(Output.isFilename() && "Unexpected ld output.");
SmallString<128> F;
F = Output.getFilename();
F += ".opt.";
F += Format;
CmdArgs.push_back(Args.MakeArgString(F));
}
if (const Arg *A =
Args.getLastArg(options::OPT_foptimization_record_passes_EQ)) {
CmdArgs.push_back("-mllvm");
std::string Passes =
std::string("-lto-pass-remarks-filter=") + A->getValue();
CmdArgs.push_back(Args.MakeArgString(Passes));
}
if (!Format.empty()) {
CmdArgs.push_back("-mllvm");
Twine FormatArg = Twine("-lto-pass-remarks-format=") + Format;
CmdArgs.push_back(Args.MakeArgString(FormatArg));
}
if (getLastProfileUseArg(Args)) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-lto-pass-remarks-with-hotness");
if (const Arg *A =
Args.getLastArg(options::OPT_fdiagnostics_hotness_threshold_EQ)) {
CmdArgs.push_back("-mllvm");
std::string Opt =
std::string("-lto-pass-remarks-hotness-threshold=") + A->getValue();
CmdArgs.push_back(Args.MakeArgString(Opt));
}
}
}
namespace {
/// Environment. By default, same as the host application.
class VirtualEnvironment {
public:
/// Get the environment block, only if it has been overridden. This is a valid
/// environment block and includes the terminating \a nullptr.
Optional<ArrayRef<const char *>> getEnvironmentIfOverridden() const {
if (Environment)
return makeArrayRef(*Environment);
return None;
}
/// Get the parts of the environment that have been overridden. Not a valid
/// environment block.
ArrayRef<const char *> getOverriddenEnvironment() const {
return OverriddenEnvironment;
}
void set(StringRef Name, StringRef Value,
llvm::function_ref<const char *(StringRef)> SaveString);
private:
static const char **findName(const char **I, StringRef Name,
Optional<StringRef> &Existing);
static const char **getHostEnvironment();
void copyHostEnvironment(const char **I = nullptr);
Optional<SmallVector<const char *>> Environment;
SmallVector<const char *> OverriddenEnvironment;
};
} // end namespace
const char **VirtualEnvironment::findName(const char **I, StringRef Name,
Optional<StringRef> &Existing) {
std::string Prefix = (Name + Twine("=")).str();
for (; *I; ++I) {
StringRef NameValue = *I;
if (!NameValue.startswith(Prefix))
continue;
Existing = NameValue;
break;
}
return I;
}
extern char **environ;
const char **VirtualEnvironment::getHostEnvironment() {
return const_cast<const char **>(environ);
}
void VirtualEnvironment::copyHostEnvironment(const char **Hint) {
assert(!Environment);
const char **B = getHostEnvironment();
const char **I = Hint ? Hint : B;
while (*I)
++I;
Environment.emplace();
// Include room for nullptr plus 1 new variable.
Environment->reserve(I - B + 2);
// Include nullptr.
Environment->append(B, I + 1);
}
/// Set an environment variable.
///
/// FIXME: Not portable.
void VirtualEnvironment::set(
StringRef Name, StringRef Value,
llvm::function_ref<const char *(StringRef)> SaveString) {
const char **B =
Environment ? Environment->data() : const_cast<const char **>(environ);
Optional<StringRef> Existing;
const char **I = findName(B, Name, Existing);
if (Existing && Existing->drop_front(Name.size() + 1) == Value)
return;
SmallString<128> Storage;
const char *NameValue =
SaveString((Name + Twine("=") + Value).toStringRef(Storage));
// Record what has been overridden.
OverriddenEnvironment.push_back(NameValue);
// Update the environment block.
if (!Environment)
copyHostEnvironment(I);
if (*I) {
(*Environment)[I - B] = NameValue;
return;
}
Environment->back() = NameValue;
Environment->push_back(nullptr);
}
static void AppendPlatformPrefix(SmallString<128> &Path, const llvm::Triple &T);
void darwin::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
assert(Output.getType() == types::TY_Image && "Invalid linker output type.");
// If the number of arguments surpasses the system limits, we will encode the
// input files in a separate file, shortening the command line. To this end,
// build a list of input file names that can be passed via a file with the
// -filelist linker option.
llvm::opt::ArgStringList InputFileList;
// The logic here is derived from gcc's behavior; most of which
// comes from specs (starting with link_command). Consult gcc for
// more information.
ArgStringList CmdArgs;
Args.ClaimAllArgs(options::OPT_index_store_path);
Args.ClaimAllArgs(options::OPT_index_ignore_system_symbols);
Args.ClaimAllArgs(options::OPT_index_record_codegen_name);
Args.ClaimAllArgs(options::OPT_index_ignore_macros);
Args.ClaimAllArgs(options::OPT_index_ignore_pcms);
/// Hack(tm) to ignore linking errors when we are doing ARC migration.
if (Args.hasArg(options::OPT_ccc_arcmt_check,
options::OPT_ccc_arcmt_migrate)) {
for (const auto &Arg : Args)
Arg->claim();
const char *Exec =
Args.MakeArgString(getToolChain().GetProgramPath("touch"));
CmdArgs.push_back(Output.getFilename());
C.addCommand(std::make_unique<Command>(
JA, *this, ResponseFileSupport::None(), Exec, CmdArgs, None, Output));
return;
}
VersionTuple Version = getMachOToolChain().getLinkerVersion(Args);
bool LinkerIsLLD;
const char *Exec =
Args.MakeArgString(getToolChain().GetLinkerPath(&LinkerIsLLD));
// I'm not sure why this particular decomposition exists in gcc, but
// we follow suite for ease of comparison.
AddLinkArgs(C, Args, CmdArgs, Inputs, Version, LinkerIsLLD);
if (willEmitRemarks(Args) &&
checkRemarksOptions(getToolChain().getDriver(), Args,
getToolChain().getTriple()))
renderRemarksOptions(Args, CmdArgs, getToolChain().getTriple(), Output, JA);
// Propagate the -moutline flag to the linker in LTO.
if (Arg *A =
Args.getLastArg(options::OPT_moutline, options::OPT_mno_outline)) {
if (A->getOption().matches(options::OPT_moutline)) {
if (getMachOToolChain().getMachOArchName(Args) == "arm64") {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-enable-machine-outliner");
// Outline from linkonceodr functions by default in LTO.
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-enable-linkonceodr-outlining");
}
} else {
// Disable all outlining behaviour if we have mno-outline. We need to do
// this explicitly, because targets which support default outlining will
// try to do work if we don't.
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-enable-machine-outliner=never");
}
}
// Setup statistics file output.
SmallString<128> StatsFile =
getStatsFileName(Args, Output, Inputs[0], getToolChain().getDriver());
if (!StatsFile.empty()) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back(Args.MakeArgString("-lto-stats-file=" + StatsFile.str()));
}
// It seems that the 'e' option is completely ignored for dynamic executables
// (the default), and with static executables, the last one wins, as expected.
Args.AddAllArgs(CmdArgs, {options::OPT_d_Flag, options::OPT_s, options::OPT_t,
options::OPT_Z_Flag, options::OPT_u_Group,
options::OPT_e, options::OPT_r});
// Forward -ObjC when either -ObjC or -ObjC++ is used, to force loading
// members of static archive libraries which implement Objective-C classes or
// categories.
if (Args.hasArg(options::OPT_ObjC) || Args.hasArg(options::OPT_ObjCXX))
CmdArgs.push_back("-ObjC");
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
getMachOToolChain().addStartObjectFileArgs(Args, CmdArgs);
Args.AddAllArgs(CmdArgs, options::OPT_L);
AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
// Build the input file for -filelist (list of linker input files) in case we
// need it later
for (const auto &II : Inputs) {
if (!II.isFilename()) {
// This is a linker input argument.
// We cannot mix input arguments and file names in a -filelist input, thus
// we prematurely stop our list (remaining files shall be passed as
// arguments).
if (InputFileList.size() > 0)
break;
continue;
}
InputFileList.push_back(II.getFilename());
}
// Additional linker set-up and flags for Fortran. This is required in order
// to generate executables.
if (getToolChain().getDriver().IsFlangMode()) {
addFortranRuntimeLibraryPath(getToolChain(), Args, CmdArgs);
addFortranRuntimeLibs(getToolChain(), CmdArgs);
}
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs))
addOpenMPRuntime(CmdArgs, getToolChain(), Args);
if (isObjCRuntimeLinked(Args) &&
!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
// We use arclite library for both ARC and subscripting support.
getMachOToolChain().AddLinkARCArgs(Args, CmdArgs);
CmdArgs.push_back("-framework");
CmdArgs.push_back("Foundation");
// Link libobj.
CmdArgs.push_back("-lobjc");
}
if (LinkingOutput) {
CmdArgs.push_back("-arch_multiple");
CmdArgs.push_back("-final_output");
CmdArgs.push_back(LinkingOutput);
}
if (Args.hasArg(options::OPT_fnested_functions))
CmdArgs.push_back("-allow_stack_execute");
getMachOToolChain().addProfileRTLibs(Args, CmdArgs);
StringRef Parallelism = getLTOParallelism(Args, getToolChain().getDriver());
if (!Parallelism.empty()) {
CmdArgs.push_back("-mllvm");
unsigned NumThreads =
llvm::get_threadpool_strategy(Parallelism)->compute_thread_count();
CmdArgs.push_back(Args.MakeArgString("-threads=" + Twine(NumThreads)));
}
if (getToolChain().ShouldLinkCXXStdlib(Args))
getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);
bool NoStdOrDefaultLibs =
Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs);
bool ForceLinkBuiltins = Args.hasArg(options::OPT_fapple_link_rtlib);
if (!NoStdOrDefaultLibs || ForceLinkBuiltins) {
// link_ssp spec is empty.
// If we have both -nostdlib/nodefaultlibs and -fapple-link-rtlib then
// we just want to link the builtins, not the other libs like libSystem.
if (NoStdOrDefaultLibs && ForceLinkBuiltins) {
getMachOToolChain().AddLinkRuntimeLib(Args, CmdArgs, "builtins");
} else {
// Let the tool chain choose which runtime library to link.
getMachOToolChain().AddLinkRuntimeLibArgs(Args, CmdArgs,
ForceLinkBuiltins);
// No need to do anything for pthreads. Claim argument to avoid warning.
Args.ClaimAllArgs(options::OPT_pthread);
Args.ClaimAllArgs(options::OPT_pthreads);
}
}
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
// endfile_spec is empty.
}
Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
Args.AddAllArgs(CmdArgs, options::OPT_F);
// -iframework should be forwarded as -F.
for (const Arg *A : Args.filtered(options::OPT_iframework))
CmdArgs.push_back(Args.MakeArgString(std::string("-F") + A->getValue()));
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
if (Arg *A = Args.getLastArg(options::OPT_fveclib)) {
if (A->getValue() == StringRef("Accelerate")) {
CmdArgs.push_back("-framework");
CmdArgs.push_back("Accelerate");
}
}
}
// Add non-standard, platform-specific search paths, e.g., for DriverKit:
// -L<sysroot>/System/DriverKit/usr/lib
// -F<sysroot>/System/DriverKit/System/Library/Framework
{
bool NonStandardSearchPath = false;
const auto &Triple = getToolChain().getTriple();
if (Triple.isDriverKit()) {
// ld64 fixed the implicit -F and -L paths in ld64-605.1+.
NonStandardSearchPath =
Version.getMajor() < 605 ||
(Version.getMajor() == 605 && Version.getMinor().value_or(0) < 1);
}
if (NonStandardSearchPath) {
if (auto *Sysroot = Args.getLastArg(options::OPT_isysroot)) {
auto AddSearchPath = [&](StringRef Flag, StringRef SearchPath) {
SmallString<128> P(Sysroot->getValue());
AppendPlatformPrefix(P, Triple);
llvm::sys::path::append(P, SearchPath);
if (getToolChain().getVFS().exists(P)) {
CmdArgs.push_back(Args.MakeArgString(Flag + P));
}
};
AddSearchPath("-L", "/usr/lib");
AddSearchPath("-F", "/System/Library/Frameworks");
}
}
}
ResponseFileSupport ResponseSupport;
if (Version >= VersionTuple(705) || LinkerIsLLD) {
ResponseSupport = ResponseFileSupport::AtFileUTF8();
} else {
// For older versions of the linker, use the legacy filelist method instead.
ResponseSupport = {ResponseFileSupport::RF_FileList, llvm::sys::WEM_UTF8,
"-filelist"};
}
// Set the environment to include ZERO_AR_FLAGS.
//
// FIXME: Add a flag to the linkers to support this without an environment
// variable, and use that when the linkers are new enough.
VirtualEnvironment Environment;
if (Args.hasFlag(options::OPT_greproducible,
options::OPT_gno_reproducible, false))
Environment.set("ZERO_AR_DATE", "1",
[&](StringRef S) { return Args.MakeArgString(S); });
std::unique_ptr<Command> Cmd = std::make_unique<Command>(
JA, *this, ResponseSupport, Exec, CmdArgs, Inputs, Output);
Cmd->setInputFileList(std::move(InputFileList));
// Set the environment, if it has been overridden.
if (Optional<ArrayRef<const char *>> Env =
Environment.getEnvironmentIfOverridden()) {
Cmd->setEnvironment(Env->drop_back());
Cmd->setEnvironmentDisplay(Environment.getOverriddenEnvironment());
}
C.addCommand(std::move(Cmd));
}
void darwin::StaticLibTool::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const Driver &D = getToolChain().getDriver();
// Silence warning for "clang -g foo.o -o foo"
Args.ClaimAllArgs(options::OPT_g_Group);
// and "clang -emit-llvm foo.o -o foo"
Args.ClaimAllArgs(options::OPT_emit_llvm);
// and for "clang -w foo.o -o foo". Other warning options are already
// handled somewhere else.
Args.ClaimAllArgs(options::OPT_w);
// Silence warnings when linking C code with a C++ '-stdlib' argument.
Args.ClaimAllArgs(options::OPT_stdlib_EQ);
// libtool <options> <output_file> <input_files>
ArgStringList CmdArgs;
// Create and insert file members with a deterministic index.
CmdArgs.push_back("-static");
CmdArgs.push_back("-D");
CmdArgs.push_back("-no_warning_for_no_symbols");
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
for (const auto &II : Inputs) {
if (II.isFilename()) {
CmdArgs.push_back(II.getFilename());
}
}
// Delete old output archive file if it already exists before generating a new
// archive file.
const auto *OutputFileName = Output.getFilename();
if (Output.isFilename() && llvm::sys::fs::exists(OutputFileName)) {
if (std::error_code EC = llvm::sys::fs::remove(OutputFileName)) {
D.Diag(diag::err_drv_unable_to_remove_file) << EC.message();
return;
}
}
const char *Exec = Args.MakeArgString(getToolChain().GetStaticLibToolPath());
C.addCommand(std::make_unique<Command>(JA, *this,
ResponseFileSupport::AtFileUTF8(),
Exec, CmdArgs, Inputs, Output));
}
void darwin::Lipo::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
ArgStringList CmdArgs;
CmdArgs.push_back("-create");
assert(Output.isFilename() && "Unexpected lipo output.");
CmdArgs.push_back("-output");
CmdArgs.push_back(Output.getFilename());
for (const auto &II : Inputs) {
assert(II.isFilename() && "Unexpected lipo input.");
CmdArgs.push_back(II.getFilename());
}
const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("lipo"));
C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
Exec, CmdArgs, Inputs, Output));
}
void darwin::Dsymutil::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
ArgStringList CmdArgs;
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
assert(Inputs.size() == 1 && "Unable to handle multiple inputs.");
const InputInfo &Input = Inputs[0];
assert(Input.isFilename() && "Unexpected dsymutil input.");
CmdArgs.push_back(Input.getFilename());
const char *Exec =
Args.MakeArgString(getToolChain().GetProgramPath("dsymutil"));
C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
Exec, CmdArgs, Inputs, Output));
}
void darwin::VerifyDebug::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
ArgStringList CmdArgs;
CmdArgs.push_back("--verify");
CmdArgs.push_back("--debug-info");
CmdArgs.push_back("--eh-frame");
CmdArgs.push_back("--quiet");
assert(Inputs.size() == 1 && "Unable to handle multiple inputs.");
const InputInfo &Input = Inputs[0];
assert(Input.isFilename() && "Unexpected verify input");
// Grabbing the output of the earlier dsymutil run.
CmdArgs.push_back(Input.getFilename());
const char *Exec =
Args.MakeArgString(getToolChain().GetProgramPath("dwarfdump"));
C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),