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llvm-project/clang/lib/Driver/ToolChains/OpenBSD.cpp

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//===--- OpenBSD.cpp - OpenBSD 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 "OpenBSD.h"
#include "Arch/Mips.h"
#include "Arch/Sparc.h"
#include "CommonArgs.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/SanitizerArgs.h"
#include "llvm/Option/ArgList.h"
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang::driver::toolchains;
using namespace clang;
using namespace llvm::opt;
void openbsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
claimNoWarnArgs(Args);
ArgStringList CmdArgs;
switch (getToolChain().getArch()) {
case llvm::Triple::x86:
// When building 32-bit code on OpenBSD/amd64, we have to explicitly
// instruct as in the base system to assemble 32-bit code.
CmdArgs.push_back("--32");
break;
case llvm::Triple::ppc:
CmdArgs.push_back("-mppc");
CmdArgs.push_back("-many");
break;
case llvm::Triple::sparc:
case llvm::Triple::sparcel: {
CmdArgs.push_back("-32");
std::string CPU = getCPUName(Args, getToolChain().getTriple());
CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
break;
}
case llvm::Triple::sparcv9: {
CmdArgs.push_back("-64");
std::string CPU = getCPUName(Args, getToolChain().getTriple());
CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
break;
}
case llvm::Triple::mips64:
case llvm::Triple::mips64el: {
StringRef CPUName;
StringRef ABIName;
mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
CmdArgs.push_back("-mabi");
CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
if (getToolChain().getTriple().isLittleEndian())
CmdArgs.push_back("-EL");
else
CmdArgs.push_back("-EB");
AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
break;
}
default:
break;
}
Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
for (const auto &II : Inputs)
CmdArgs.push_back(II.getFilename());
const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
}
void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const toolchains::OpenBSD &ToolChain =
static_cast<const toolchains::OpenBSD &>(getToolChain());
const Driver &D = getToolChain().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);
if (ToolChain.getArch() == llvm::Triple::mips64)
CmdArgs.push_back("-EB");
else if (ToolChain.getArch() == llvm::Triple::mips64el)
CmdArgs.push_back("-EL");
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_shared)) {
CmdArgs.push_back("-e");
CmdArgs.push_back("__start");
}
CmdArgs.push_back("--eh-frame-hdr");
if (Args.hasArg(options::OPT_static)) {
CmdArgs.push_back("-Bstatic");
} else {
if (Args.hasArg(options::OPT_rdynamic))
CmdArgs.push_back("-export-dynamic");
CmdArgs.push_back("-Bdynamic");
if (Args.hasArg(options::OPT_shared)) {
CmdArgs.push_back("-shared");
} else {
CmdArgs.push_back("-dynamic-linker");
CmdArgs.push_back("/usr/libexec/ld.so");
}
}
if (Args.hasArg(options::OPT_pie))
CmdArgs.push_back("-pie");
if (Args.hasArg(options::OPT_nopie) || Args.hasArg(options::OPT_pg))
CmdArgs.push_back("-nopie");
if (Output.isFilename()) {
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
} else {
assert(Output.isNothing() && "Invalid output.");
}
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
const char *crt0 = nullptr;
const char *crtbegin = nullptr;
if (!Args.hasArg(options::OPT_shared)) {
if (Args.hasArg(options::OPT_pg))
crt0 = "gcrt0.o";
else if (Args.hasArg(options::OPT_static) &&
!Args.hasArg(options::OPT_nopie))
crt0 = "rcrt0.o";
else
crt0 = "crt0.o";
crtbegin = "crtbegin.o";
} else {
crtbegin = "crtbeginS.o";
}
if (crt0)
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt0)));
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
}
Args.AddAllArgs(CmdArgs, options::OPT_L);
ToolChain.AddFilePathLibArgs(Args, CmdArgs);
Args.AddAllArgs(CmdArgs, {options::OPT_T_Group, options::OPT_e,
options::OPT_s, options::OPT_t,
options::OPT_Z_Flag, options::OPT_r});
bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
if (D.CCCIsCXX()) {
if (ToolChain.ShouldLinkCXXStdlib(Args))
ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
if (Args.hasArg(options::OPT_pg))
CmdArgs.push_back("-lm_p");
else
CmdArgs.push_back("-lm");
}
if (NeedsSanitizerDeps) {
CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));
linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
}
if (NeedsXRayDeps) {
CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));
linkXRayRuntimeDeps(ToolChain, CmdArgs);
}
// FIXME: For some reason GCC passes -lgcc before adding
// the default system libraries. Just mimic this for now.
CmdArgs.push_back("-lcompiler_rt");
if (Args.hasArg(options::OPT_pthread)) {
if (!Args.hasArg(options::OPT_shared) && Args.hasArg(options::OPT_pg))
CmdArgs.push_back("-lpthread_p");
else
CmdArgs.push_back("-lpthread");
}
if (!Args.hasArg(options::OPT_shared)) {
if (Args.hasArg(options::OPT_pg))
CmdArgs.push_back("-lc_p");
else
CmdArgs.push_back("-lc");
}
CmdArgs.push_back("-lcompiler_rt");
}
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
const char *crtend = nullptr;
if (!Args.hasArg(options::OPT_shared))
crtend = "crtend.o";
else
crtend = "crtendS.o";
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
}
const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
}
SanitizerMask OpenBSD::getSupportedSanitizers() const {
const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
// For future use, only UBsan at the moment
SanitizerMask Res = ToolChain::getSupportedSanitizers();
if (IsX86 || IsX86_64) {
Res |= SanitizerKind::Vptr;
Res |= SanitizerKind::Fuzzer;
Res |= SanitizerKind::FuzzerNoLink;
}
return Res;
}
/// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly.
OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args)
: Generic_ELF(D, Triple, Args) {
getFilePaths().push_back(getDriver().SysRoot + "/usr/lib");
}
void OpenBSD::AddCXXStdlibLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
bool Profiling = Args.hasArg(options::OPT_pg);
CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
CmdArgs.push_back(Profiling ? "-lc++abi_p" : "-lc++abi");
}
Tool *OpenBSD::buildAssembler() const {
return new tools::openbsd::Assembler(*this);
}
Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); }
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