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

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//===--- NaCl.cpp - Native Client 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 "NaCl.h"
#include "InputInfo.h"
#include "CommonArgs.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/Path.h"
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang::driver::toolchains;
using namespace clang;
using namespace llvm::opt;
// NaCl ARM assembly (inline or standalone) can be written with a set of macros
// for the various SFI requirements like register masking. The assembly tool
// inserts the file containing the macros as an input into all the assembly
// jobs.
void nacltools::AssemblerARM::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const toolchains::NaClToolChain &ToolChain =
static_cast<const toolchains::NaClToolChain &>(getToolChain());
InputInfo NaClMacros(types::TY_PP_Asm, ToolChain.GetNaClArmMacrosPath(),
"nacl-arm-macros.s");
InputInfoList NewInputs;
NewInputs.push_back(NaClMacros);
NewInputs.append(Inputs.begin(), Inputs.end());
gnutools::Assembler::ConstructJob(C, JA, Output, NewInputs, Args,
LinkingOutput);
}
// This is quite similar to gnutools::Linker::ConstructJob with changes that
// we use static by default, do not yet support sanitizers or LTO, and a few
// others. Eventually we can support more of that and hopefully migrate back
// to gnutools::Linker.
void nacltools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const toolchains::NaClToolChain &ToolChain =
static_cast<const toolchains::NaClToolChain &>(getToolChain());
const Driver &D = ToolChain.getDriver();
const llvm::Triple::ArchType Arch = ToolChain.getArch();
const bool IsStatic =
!Args.hasArg(options::OPT_dynamic) && !Args.hasArg(options::OPT_shared);
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 (!D.SysRoot.empty())
CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
if (Args.hasArg(options::OPT_rdynamic))
CmdArgs.push_back("-export-dynamic");
if (Args.hasArg(options::OPT_s))
CmdArgs.push_back("-s");
// NaClToolChain doesn't have ExtraOpts like Linux; the only relevant flag
// from there is --build-id, which we do want.
CmdArgs.push_back("--build-id");
if (!IsStatic)
CmdArgs.push_back("--eh-frame-hdr");
CmdArgs.push_back("-m");
if (Arch == llvm::Triple::x86)
CmdArgs.push_back("elf_i386_nacl");
else if (Arch == llvm::Triple::arm)
CmdArgs.push_back("armelf_nacl");
else if (Arch == llvm::Triple::x86_64)
CmdArgs.push_back("elf_x86_64_nacl");
else if (Arch == llvm::Triple::mipsel)
CmdArgs.push_back("mipselelf_nacl");
else
D.Diag(diag::err_target_unsupported_arch) << ToolChain.getArchName()
<< "Native Client";
if (IsStatic)
CmdArgs.push_back("-static");
else if (Args.hasArg(options::OPT_shared))
CmdArgs.push_back("-shared");
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("crt1.o")));
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
const char *crtbegin;
if (IsStatic)
crtbegin = "crtbeginT.o";
else if (Args.hasArg(options::OPT_shared))
crtbegin = "crtbeginS.o";
else
crtbegin = "crtbegin.o";
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
}
Args.AddAllArgs(CmdArgs, options::OPT_L);
Args.AddAllArgs(CmdArgs, options::OPT_u);
ToolChain.AddFilePathLibArgs(Args, CmdArgs);
if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
CmdArgs.push_back("--no-demangle");
AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
if (D.CCCIsCXX() &&
!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
if (ToolChain.ShouldLinkCXXStdlib(Args)) {
bool OnlyLibstdcxxStatic =
Args.hasArg(options::OPT_static_libstdcxx) && !IsStatic;
if (OnlyLibstdcxxStatic)
CmdArgs.push_back("-Bstatic");
ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
if (OnlyLibstdcxxStatic)
CmdArgs.push_back("-Bdynamic");
}
CmdArgs.push_back("-lm");
}
if (!Args.hasArg(options::OPT_nostdlib)) {
if (!Args.hasArg(options::OPT_nodefaultlibs)) {
// Always use groups, since it has no effect on dynamic libraries.
CmdArgs.push_back("--start-group");
CmdArgs.push_back("-lc");
// NaCl's libc++ currently requires libpthread, so just always include it
// in the group for C++.
if (Args.hasArg(options::OPT_pthread) ||
Args.hasArg(options::OPT_pthreads) || D.CCCIsCXX()) {
// Gold, used by Mips, handles nested groups differently than ld, and
// without '-lnacl' it prefers symbols from libpthread.a over libnacl.a,
// which is not a desired behaviour here.
// See https://sourceware.org/ml/binutils/2015-03/msg00034.html
if (getToolChain().getArch() == llvm::Triple::mipsel)
CmdArgs.push_back("-lnacl");
CmdArgs.push_back("-lpthread");
}
CmdArgs.push_back("-lgcc");
CmdArgs.push_back("--as-needed");
if (IsStatic)
CmdArgs.push_back("-lgcc_eh");
else
CmdArgs.push_back("-lgcc_s");
CmdArgs.push_back("--no-as-needed");
// Mips needs to create and use pnacl_legacy library that contains
// definitions from bitcode/pnaclmm.c and definitions for
// __nacl_tp_tls_offset() and __nacl_tp_tdb_offset().
if (getToolChain().getArch() == llvm::Triple::mipsel)
CmdArgs.push_back("-lpnacl_legacy");
CmdArgs.push_back("--end-group");
}
if (!Args.hasArg(options::OPT_nostartfiles)) {
const char *crtend;
if (Args.hasArg(options::OPT_shared))
crtend = "crtendS.o";
else
crtend = "crtend.o";
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
}
}
const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
}
/// NaCl Toolchain
NaClToolChain::NaClToolChain(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args)
: Generic_ELF(D, Triple, Args) {
// Remove paths added by Generic_GCC. NaCl Toolchain cannot use the
// default paths, and must instead only use the paths provided
// with this toolchain based on architecture.
path_list &file_paths = getFilePaths();
path_list &prog_paths = getProgramPaths();
file_paths.clear();
prog_paths.clear();
// Path for library files (libc.a, ...)
std::string FilePath(getDriver().Dir + "/../");
// Path for tools (clang, ld, etc..)
std::string ProgPath(getDriver().Dir + "/../");
// Path for toolchain libraries (libgcc.a, ...)
std::string ToolPath(getDriver().ResourceDir + "/lib/");
switch (Triple.getArch()) {
case llvm::Triple::x86:
file_paths.push_back(FilePath + "x86_64-nacl/lib32");
file_paths.push_back(FilePath + "i686-nacl/usr/lib");
prog_paths.push_back(ProgPath + "x86_64-nacl/bin");
file_paths.push_back(ToolPath + "i686-nacl");
break;
case llvm::Triple::x86_64:
file_paths.push_back(FilePath + "x86_64-nacl/lib");
file_paths.push_back(FilePath + "x86_64-nacl/usr/lib");
prog_paths.push_back(ProgPath + "x86_64-nacl/bin");
file_paths.push_back(ToolPath + "x86_64-nacl");
break;
case llvm::Triple::arm:
file_paths.push_back(FilePath + "arm-nacl/lib");
file_paths.push_back(FilePath + "arm-nacl/usr/lib");
prog_paths.push_back(ProgPath + "arm-nacl/bin");
file_paths.push_back(ToolPath + "arm-nacl");
break;
case llvm::Triple::mipsel:
file_paths.push_back(FilePath + "mipsel-nacl/lib");
file_paths.push_back(FilePath + "mipsel-nacl/usr/lib");
prog_paths.push_back(ProgPath + "bin");
file_paths.push_back(ToolPath + "mipsel-nacl");
break;
default:
break;
}
NaClArmMacrosPath = GetFilePath("nacl-arm-macros.s");
}
void NaClToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
const Driver &D = getDriver();
if (DriverArgs.hasArg(clang::driver::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.str());
}
if (DriverArgs.hasArg(options::OPT_nostdlibinc))
return;
SmallString<128> P(D.Dir + "/../");
switch (getTriple().getArch()) {
case llvm::Triple::x86:
// x86 is special because multilib style uses x86_64-nacl/include for libc
// headers but the SDK wants i686-nacl/usr/include. The other architectures
// have the same substring.
llvm::sys::path::append(P, "i686-nacl/usr/include");
addSystemInclude(DriverArgs, CC1Args, P.str());
llvm::sys::path::remove_filename(P);
llvm::sys::path::remove_filename(P);
llvm::sys::path::remove_filename(P);
llvm::sys::path::append(P, "x86_64-nacl/include");
addSystemInclude(DriverArgs, CC1Args, P.str());
return;
case llvm::Triple::arm:
llvm::sys::path::append(P, "arm-nacl/usr/include");
break;
case llvm::Triple::x86_64:
llvm::sys::path::append(P, "x86_64-nacl/usr/include");
break;
case llvm::Triple::mipsel:
llvm::sys::path::append(P, "mipsel-nacl/usr/include");
break;
default:
return;
}
addSystemInclude(DriverArgs, CC1Args, P.str());
llvm::sys::path::remove_filename(P);
llvm::sys::path::remove_filename(P);
llvm::sys::path::append(P, "include");
addSystemInclude(DriverArgs, CC1Args, P.str());
}
void NaClToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
// Check for -stdlib= flags. We only support libc++ but this consumes the arg
// if the value is libc++, and emits an error for other values.
GetCXXStdlibType(Args);
CmdArgs.push_back("-lc++");
}
void NaClToolChain::addLibCxxIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
const Driver &D = getDriver();
SmallString<128> P(D.Dir + "/../");
switch (getTriple().getArch()) {
default:
break;
case llvm::Triple::arm:
llvm::sys::path::append(P, "arm-nacl/include/c++/v1");
addSystemInclude(DriverArgs, CC1Args, P.str());
break;
case llvm::Triple::x86:
llvm::sys::path::append(P, "x86_64-nacl/include/c++/v1");
addSystemInclude(DriverArgs, CC1Args, P.str());
break;
case llvm::Triple::x86_64:
llvm::sys::path::append(P, "x86_64-nacl/include/c++/v1");
addSystemInclude(DriverArgs, CC1Args, P.str());
break;
case llvm::Triple::mipsel:
llvm::sys::path::append(P, "mipsel-nacl/include/c++/v1");
addSystemInclude(DriverArgs, CC1Args, P.str());
break;
}
}
ToolChain::CXXStdlibType
NaClToolChain::GetCXXStdlibType(const ArgList &Args) const {
if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
StringRef Value = A->getValue();
if (Value == "libc++")
return ToolChain::CST_Libcxx;
getDriver().Diag(clang::diag::err_drv_invalid_stdlib_name)
<< A->getAsString(Args);
}
return ToolChain::CST_Libcxx;
}
std::string
NaClToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
types::ID InputType) const {
llvm::Triple TheTriple(ComputeLLVMTriple(Args, InputType));
if (TheTriple.getArch() == llvm::Triple::arm &&
TheTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
TheTriple.setEnvironment(llvm::Triple::GNUEABIHF);
return TheTriple.getTriple();
}
Tool *NaClToolChain::buildLinker() const {
return new tools::nacltools::Linker(*this);
}
Tool *NaClToolChain::buildAssembler() const {
if (getTriple().getArch() == llvm::Triple::arm)
return new tools::nacltools::AssemblerARM(*this);
return new tools::gnutools::Assembler(*this);
}
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