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//===--- ToolChain.cpp - Collections of tools for one platform ------------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "clang/Driver/ToolChain.h"
#include "clang/Driver/Action.h"
#include "clang/Driver/Arg.h"
#include "clang/Driver/ArgList.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Option.h"
#include "clang/Driver/Options.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/ErrorHandling.h"
#include "clang/Basic/ObjCRuntime.h"
using namespace clang::driver;
using namespace clang;
ToolChain::ToolChain(const Driver &D, const llvm::Triple &T)
: D(D), Triple(T) {
ToolChain::~ToolChain() {
const Driver &ToolChain::getDriver() const {
return D;
std::string ToolChain::getDefaultUniversalArchName() const {
// In universal driver terms, the arch name accepted by -arch isn't exactly
// the same as the ones that appear in the triple. Roughly speaking, this is
// an inverse of the darwin::getArchTypeForDarwinArchName() function, but the
// only interesting special case is powerpc.
switch (Triple.getArch()) {
case llvm::Triple::ppc:
return "ppc";
case llvm::Triple::ppc64:
return "ppc64";
return Triple.getArchName();
bool ToolChain::IsUnwindTablesDefault() const {
return false;
std::string ToolChain::GetFilePath(const char *Name) const {
return D.GetFilePath(Name, *this);
std::string ToolChain::GetProgramPath(const char *Name) const {
return D.GetProgramPath(Name, *this);
types::ID ToolChain::LookupTypeForExtension(const char *Ext) const {
return types::lookupTypeForExtension(Ext);
bool ToolChain::HasNativeLLVMSupport() const {
return false;
ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
/// getARMTargetCPU - Get the (LLVM) name of the ARM cpu we are targeting.
// FIXME: tblgen this.
static const char *getARMTargetCPU(const ArgList &Args,
const llvm::Triple &Triple) {
// For Darwin targets, the -arch option (which is translated to a
// corresponding -march option) should determine the architecture
// (and the Mach-O slice) regardless of any -mcpu options.
if (!Triple.isOSDarwin()) {
// FIXME: Warn on inconsistent use of -mcpu and -march.
// If we have -mcpu=, use that.
if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
return A->getValue();
StringRef MArch;
if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
// Otherwise, if we have -march= choose the base CPU for that arch.
MArch = A->getValue();
} else {
// Otherwise, use the Arch from the triple.
MArch = Triple.getArchName();
return llvm::StringSwitch<const char *>(MArch)
.Cases("armv2", "armv2a","arm2")
.Case("armv3", "arm6")
.Case("armv3m", "arm7m")
.Cases("armv4", "armv4t", "arm7tdmi")
.Cases("armv5", "armv5t", "arm10tdmi")
.Cases("armv5e", "armv5te", "arm1026ejs")
.Case("armv5tej", "arm926ej-s")
.Cases("armv6", "armv6k", "arm1136jf-s")
.Case("armv6j", "arm1136j-s")
.Cases("armv6z", "armv6zk", "arm1176jzf-s")
.Case("armv6t2", "arm1156t2-s")
.Cases("armv7", "armv7a", "armv7-a", "cortex-a8")
.Cases("armv7f", "armv7-f", "cortex-a9-mp")
.Cases("armv7s", "armv7-s", "swift")
.Cases("armv7r", "armv7-r", "cortex-r4")
.Cases("armv7m", "armv7-m", "cortex-m3")
.Case("ep9312", "ep9312")
.Case("iwmmxt", "iwmmxt")
.Case("xscale", "xscale")
.Cases("armv6m", "armv6-m", "cortex-m0")
// If all else failed, return the most base CPU LLVM supports.
/// getLLVMArchSuffixForARM - Get the LLVM arch name to use for a particular
/// CPU.
// FIXME: This is redundant with -mcpu, why does LLVM use this.
// FIXME: tblgen this, or kill it!
static const char *getLLVMArchSuffixForARM(StringRef CPU) {
return llvm::StringSwitch<const char *>(CPU)
.Cases("arm7tdmi", "arm7tdmi-s", "arm710t", "v4t")
.Cases("arm720t", "arm9", "arm9tdmi", "v4t")
.Cases("arm920", "arm920t", "arm922t", "v4t")
.Cases("arm940t", "ep9312","v4t")
.Cases("arm10tdmi", "arm1020t", "v5")
.Cases("arm9e", "arm926ej-s", "arm946e-s", "v5e")
.Cases("arm966e-s", "arm968e-s", "arm10e", "v5e")
.Cases("arm1020e", "arm1022e", "xscale", "iwmmxt", "v5e")
.Cases("arm1136j-s", "arm1136jf-s", "arm1176jz-s", "v6")
.Cases("arm1176jzf-s", "mpcorenovfp", "mpcore", "v6")
.Cases("arm1156t2-s", "arm1156t2f-s", "v6t2")
.Cases("cortex-a8", "cortex-a9", "cortex-a15", "v7")
.Case("cortex-m3", "v7m")
.Case("cortex-m4", "v7m")
.Case("cortex-m0", "v6m")
.Case("cortex-a9-mp", "v7f")
.Case("swift", "v7s")
std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
types::ID InputType) const {
switch (getTriple().getArch()) {
return getTripleString();
case llvm::Triple::arm:
case llvm::Triple::thumb: {
// FIXME: Factor into subclasses.
llvm::Triple Triple = getTriple();
// Thumb2 is the default for V7 on Darwin.
// FIXME: Thumb should just be another -target-feaure, not in the triple.
StringRef Suffix =
getLLVMArchSuffixForARM(getARMTargetCPU(Args, Triple));
bool ThumbDefault = (Suffix.startswith("v7") && getTriple().isOSDarwin());
std::string ArchName = "arm";
// Assembly files should start in ARM mode.
if (InputType != types::TY_PP_Asm &&
Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, ThumbDefault))
ArchName = "thumb";
Triple.setArchName(ArchName + Suffix.str());
return Triple.getTriple();
std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
types::ID InputType) const {
// Diagnose use of Darwin OS deployment target arguments on non-Darwin.
if (Arg *A = Args.getLastArg(options::OPT_mmacosx_version_min_EQ,
<< A->getAsString(Args);
return ComputeLLVMTriple(Args, InputType);
void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
// Each toolchain should provide the appropriate include flags.
void ToolChain::addClangTargetOptions(ArgStringList &CC1Args) const {
ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
const ArgList &Args) const
if (Arg *A = Args.getLastArg(options::OPT_rtlib_EQ)) {
StringRef Value = A->getValue();
if (Value == "compiler-rt")
return ToolChain::RLT_CompilerRT;
if (Value == "libgcc")
return ToolChain::RLT_Libgcc;
<< A->getAsString(Args);
return GetDefaultRuntimeLibType();
ToolChain::CXXStdlibType ToolChain::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;
if (Value == "libstdc++")
return ToolChain::CST_Libstdcxx;
<< A->getAsString(Args);
return ToolChain::CST_Libstdcxx;
/// \brief Utility function to add a system include directory to CC1 arguments.
/*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
ArgStringList &CC1Args,
const Twine &Path) {
/// \brief Utility function to add a system include directory with extern "C"
/// semantics to CC1 arguments.
/// Note that this should be used rarely, and only for directories that
/// historically and for legacy reasons are treated as having implicit extern
/// "C" semantics. These semantics are *ignored* by and large today, but its
/// important to preserve the preprocessor changes resulting from the
/// classification.
/*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
ArgStringList &CC1Args,
const Twine &Path) {
/// \brief Utility function to add a list of system include directories to CC1.
/*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
ArgStringList &CC1Args,
ArrayRef<StringRef> Paths) {
for (ArrayRef<StringRef>::iterator I = Paths.begin(), E = Paths.end();
I != E; ++I) {
void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
// Header search paths should be handled by each of the subclasses.
// Historically, they have not been, and instead have been handled inside of
// the CC1-layer frontend. As the logic is hoisted out, this generic function
// will slowly stop being called.
// While it is being called, replicate a bit of a hack to propagate the
// '-stdlib=' flag down to CC1 so that it can in turn customize the C++
// header search paths with it. Once all systems are overriding this
// function, the CC1 flag and this line can be removed.
DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
CXXStdlibType Type = GetCXXStdlibType(Args);
switch (Type) {
case ToolChain::CST_Libcxx:
case ToolChain::CST_Libstdcxx:
void ToolChain::AddCCKextLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
bool ToolChain::AddFastMathRuntimeIfAvailable(const ArgList &Args,
ArgStringList &CmdArgs) const {
// Check if -ffast-math or -funsafe-math is enabled.
Arg *A = Args.getLastArg(options::OPT_ffast_math,
if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
return false;
// If crtfastmath.o exists add it to the arguments.
std::string Path = GetFilePath("crtfastmath.o");
if (Path == "crtfastmath.o") // Not found.
return false;
return true;