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//===--- Fuchsia.cpp - Fuchsia 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 "Fuchsia.h"
#include "CommonArgs.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/Option/ArgList.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/VirtualFileSystem.h"
using namespace clang::driver;
using namespace clang::driver::toolchains;
using namespace clang::driver::tools;
using namespace clang;
using namespace llvm::opt;
using tools::addMultilibFlag;
void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const toolchains::Fuchsia &ToolChain =
static_cast<const toolchains::Fuchsia &>(getToolChain());
const Driver &D = ToolChain.getDriver();
ArgStringList CmdArgs;
// 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);
CmdArgs.push_back("-z");
CmdArgs.push_back("max-page-size=4096");
CmdArgs.push_back("-z");
CmdArgs.push_back("now");
const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
if (llvm::sys::path::filename(Exec).equals_insensitive("ld.lld") ||
llvm::sys::path::stem(Exec).equals_insensitive("ld.lld")) {
CmdArgs.push_back("-z");
CmdArgs.push_back("rodynamic");
CmdArgs.push_back("-z");
CmdArgs.push_back("separate-loadable-segments");
CmdArgs.push_back("-z");
CmdArgs.push_back("rel");
CmdArgs.push_back("--pack-dyn-relocs=relr");
}
if (!D.SysRoot.empty())
CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
CmdArgs.push_back("-pie");
if (Args.hasArg(options::OPT_rdynamic))
CmdArgs.push_back("-export-dynamic");
if (Args.hasArg(options::OPT_s))
CmdArgs.push_back("-s");
if (Args.hasArg(options::OPT_r)) {
CmdArgs.push_back("-r");
} else {
CmdArgs.push_back("--build-id");
CmdArgs.push_back("--hash-style=gnu");
}
CmdArgs.push_back("--eh-frame-hdr");
if (Args.hasArg(options::OPT_static))
CmdArgs.push_back("-Bstatic");
else if (Args.hasArg(options::OPT_shared))
CmdArgs.push_back("-shared");
const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs(Args);
if (!Args.hasArg(options::OPT_shared)) {
std::string Dyld = D.DyldPrefix;
if (SanArgs.needsAsanRt() && SanArgs.needsSharedRt())
Dyld += "asan/";
if (SanArgs.needsHwasanRt() && SanArgs.needsSharedRt())
Dyld += "hwasan/";
if (SanArgs.needsTsanRt() && SanArgs.needsSharedRt())
Dyld += "tsan/";
Dyld += "ld.so.1";
CmdArgs.push_back("-dynamic-linker");
CmdArgs.push_back(Args.MakeArgString(Dyld));
}
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
if (!Args.hasArg(options::OPT_shared)) {
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
}
}
Args.AddAllArgs(CmdArgs, options::OPT_L);
Args.AddAllArgs(CmdArgs, options::OPT_u);
ToolChain.AddFilePathLibArgs(Args, CmdArgs);
if (D.isUsingLTO()) {
assert(!Inputs.empty() && "Must have at least one input.");
addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0],
D.getLTOMode() == LTOK_Thin);
}
bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
ToolChain.addProfileRTLibs(Args, CmdArgs);
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
if (Args.hasArg(options::OPT_static))
CmdArgs.push_back("-Bdynamic");
if (D.CCCIsCXX()) {
if (ToolChain.ShouldLinkCXXStdlib(Args)) {
bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
!Args.hasArg(options::OPT_static);
CmdArgs.push_back("--push-state");
CmdArgs.push_back("--as-needed");
if (OnlyLibstdcxxStatic)
CmdArgs.push_back("-Bstatic");
ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
if (OnlyLibstdcxxStatic)
CmdArgs.push_back("-Bdynamic");
CmdArgs.push_back("-lm");
CmdArgs.push_back("--pop-state");
}
}
if (NeedsSanitizerDeps)
linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
if (NeedsXRayDeps)
linkXRayRuntimeDeps(ToolChain, CmdArgs);
AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
if (Args.hasArg(options::OPT_pthread) ||
Args.hasArg(options::OPT_pthreads))
CmdArgs.push_back("-lpthread");
if (Args.hasArg(options::OPT_fsplit_stack))
CmdArgs.push_back("--wrap=pthread_create");
if (!Args.hasArg(options::OPT_nolibc))
CmdArgs.push_back("-lc");
}
C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
Exec, CmdArgs, Inputs, Output));
}
/// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args)
: ToolChain(D, Triple, Args) {
getProgramPaths().push_back(getDriver().getInstalledDir());
if (getDriver().getInstalledDir() != D.Dir)
getProgramPaths().push_back(D.Dir);
if (!D.SysRoot.empty()) {
SmallString<128> P(D.SysRoot);
llvm::sys::path::append(P, "lib");
getFilePaths().push_back(std::string(P.str()));
}
auto FilePaths = [&](const Multilib &M) -> std::vector<std::string> {
std::vector<std::string> FP;
SmallString<128> P(getStdlibPath());
llvm::sys::path::append(P, M.gccSuffix());
FP.push_back(std::string(P.str()));
return FP;
};
Multilibs.push_back(Multilib());
// Use the noexcept variant with -fno-exceptions to avoid the extra overhead.
Multilibs.push_back(Multilib("noexcept", {}, {}, 1)
.flag("-fexceptions")
.flag("+fno-exceptions"));
// ASan has higher priority because we always want the instrumentated version.
Multilibs.push_back(Multilib("asan", {}, {}, 2)
.flag("+fsanitize=address"));
// Use the asan+noexcept variant with ASan and -fno-exceptions.
Multilibs.push_back(Multilib("asan+noexcept", {}, {}, 3)
.flag("+fsanitize=address")
.flag("-fexceptions")
.flag("+fno-exceptions"));
// HWASan has higher priority because we always want the instrumentated
// version.
Multilibs.push_back(
Multilib("hwasan", {}, {}, 4).flag("+fsanitize=hwaddress"));
// Use the hwasan+noexcept variant with HWASan and -fno-exceptions.
Multilibs.push_back(Multilib("hwasan+noexcept", {}, {}, 5)
.flag("+fsanitize=hwaddress")
.flag("-fexceptions")
.flag("+fno-exceptions"));
// Use the relative vtables ABI.
// TODO: Remove these multilibs once relative vtables are enabled by default
// for Fuchsia.
Multilibs.push_back(Multilib("relative-vtables", {}, {}, 6)
.flag("+fexperimental-relative-c++-abi-vtables"));
Multilibs.push_back(Multilib("relative-vtables+noexcept", {}, {}, 7)
.flag("+fexperimental-relative-c++-abi-vtables")
.flag("-fexceptions")
.flag("+fno-exceptions"));
Multilibs.push_back(Multilib("relative-vtables+asan", {}, {}, 8)
.flag("+fexperimental-relative-c++-abi-vtables")
.flag("+fsanitize=address"));
Multilibs.push_back(Multilib("relative-vtables+asan+noexcept", {}, {}, 9)
.flag("+fexperimental-relative-c++-abi-vtables")
.flag("+fsanitize=address")
.flag("-fexceptions")
.flag("+fno-exceptions"));
Multilibs.push_back(Multilib("relative-vtables+hwasan", {}, {}, 10)
.flag("+fexperimental-relative-c++-abi-vtables")
.flag("+fsanitize=hwaddress"));
Multilibs.push_back(Multilib("relative-vtables+hwasan+noexcept", {}, {}, 11)
.flag("+fexperimental-relative-c++-abi-vtables")
.flag("+fsanitize=hwaddress")
.flag("-fexceptions")
.flag("+fno-exceptions"));
// Use Itanium C++ ABI for the compat multilib.
Multilibs.push_back(Multilib("compat", {}, {}, 12).flag("+fc++-abi=itanium"));
Multilibs.FilterOut([&](const Multilib &M) {
std::vector<std::string> RD = FilePaths(M);
return llvm::all_of(RD, [&](std::string P) { return !getVFS().exists(P); });
});
Multilib::flags_list Flags;
addMultilibFlag(
Args.hasFlag(options::OPT_fexceptions, options::OPT_fno_exceptions, true),
"fexceptions", Flags);
addMultilibFlag(getSanitizerArgs(Args).needsAsanRt(), "fsanitize=address",
Flags);
addMultilibFlag(getSanitizerArgs(Args).needsHwasanRt(), "fsanitize=hwaddress",
Flags);
addMultilibFlag(
Args.hasFlag(options::OPT_fexperimental_relative_cxx_abi_vtables,
options::OPT_fno_experimental_relative_cxx_abi_vtables,
/*default=*/false),
"fexperimental-relative-c++-abi-vtables", Flags);
addMultilibFlag(Args.getLastArgValue(options::OPT_fcxx_abi_EQ) == "itanium",
"fc++-abi=itanium", Flags);
Multilibs.setFilePathsCallback(FilePaths);
if (Multilibs.select(Flags, SelectedMultilib))
if (!SelectedMultilib.isDefault())
if (const auto &PathsCallback = Multilibs.filePathsCallback())
for (const auto &Path : PathsCallback(SelectedMultilib))
// Prepend the multilib path to ensure it takes the precedence.
getFilePaths().insert(getFilePaths().begin(), Path);
}
std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
types::ID InputType) const {
llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
return Triple.str();
}
Tool *Fuchsia::buildLinker() const {
return new tools::fuchsia::Linker(*this);
}
ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
const ArgList &Args) const {
if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
StringRef Value = A->getValue();
if (Value != "compiler-rt")
getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
<< A->getAsString(Args);
}
return ToolChain::RLT_CompilerRT;
}
ToolChain::CXXStdlibType
Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
StringRef Value = A->getValue();
if (Value != "libc++")
getDriver().Diag(diag::err_drv_invalid_stdlib_name)
<< A->getAsString(Args);
}
return ToolChain::CST_Libcxx;
}
void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
ArgStringList &CC1Args,
Action::OffloadKind) const {
if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
options::OPT_fno_use_init_array, true))
CC1Args.push_back("-fno-use-init-array");
}
void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
const Driver &D = getDriver();
if (DriverArgs.hasArg(options::OPT_nostdinc))
return;
if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
SmallString<128> P(D.ResourceDir);
llvm::sys::path::append(P, "include");
addSystemInclude(DriverArgs, CC1Args, P);
}
if (DriverArgs.hasArg(options::OPT_nostdlibinc))
return;
// Check for configure-time C include directories.
StringRef CIncludeDirs(C_INCLUDE_DIRS);
if (CIncludeDirs != "") {
SmallVector<StringRef, 5> dirs;
CIncludeDirs.split(dirs, ":");
for (StringRef dir : dirs) {
StringRef Prefix =
llvm::sys::path::is_absolute(dir) ? "" : StringRef(D.SysRoot);
addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
}
return;
}
if (!D.SysRoot.empty()) {
SmallString<128> P(D.SysRoot);
llvm::sys::path::append(P, "include");
addExternCSystemInclude(DriverArgs, CC1Args, P.str());
}
}
void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
DriverArgs.hasArg(options::OPT_nostdincxx))
return;
const Driver &D = getDriver();
std::string Target = getTripleString();
auto AddCXXIncludePath = [&](StringRef Path) {
std::string Version = detectLibcxxVersion(Path);
if (Version.empty())
return;
// First add the per-target include path.
SmallString<128> TargetDir(Path);
llvm::sys::path::append(TargetDir, Target, "c++", Version);
if (getVFS().exists(TargetDir))
addSystemInclude(DriverArgs, CC1Args, TargetDir);
// Second add the generic one.
SmallString<128> Dir(Path);
llvm::sys::path::append(Dir, "c++", Version);
addSystemInclude(DriverArgs, CC1Args, Dir);
};
switch (GetCXXStdlibType(DriverArgs)) {
case ToolChain::CST_Libcxx: {
SmallString<128> P(D.Dir);
llvm::sys::path::append(P, "..", "include");
AddCXXIncludePath(P);
break;
}
default:
llvm_unreachable("invalid stdlib name");
}
}
void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
switch (GetCXXStdlibType(Args)) {
case ToolChain::CST_Libcxx:
CmdArgs.push_back("-lc++");
break;
case ToolChain::CST_Libstdcxx:
llvm_unreachable("invalid stdlib name");
}
}
SanitizerMask Fuchsia::getSupportedSanitizers() const {
SanitizerMask Res = ToolChain::getSupportedSanitizers();
Res |= SanitizerKind::Address;
Res |= SanitizerKind::HWAddress;
Res |= SanitizerKind::PointerCompare;
Res |= SanitizerKind::PointerSubtract;
Res |= SanitizerKind::Fuzzer;
Res |= SanitizerKind::FuzzerNoLink;
Res |= SanitizerKind::Leak;
Res |= SanitizerKind::SafeStack;
Res |= SanitizerKind::Scudo;
Res |= SanitizerKind::Thread;
return Res;
}
SanitizerMask Fuchsia::getDefaultSanitizers() const {
SanitizerMask Res;
switch (getTriple().getArch()) {
case llvm::Triple::aarch64:
Res |= SanitizerKind::ShadowCallStack;
break;
case llvm::Triple::x86_64:
Res |= SanitizerKind::SafeStack;
break;
default:
// TODO: Enable SafeStack on RISC-V once tested.
break;
}
return Res;
}