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//===- ToolChain.h - Collections of tools for one platform ------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "clang/Basic/LLVM.h"
#include "clang/Basic/Sanitizers.h"
#include "clang/Driver/Action.h"
#include "clang/Driver/Multilib.h"
#include "clang/Driver/Types.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/VersionTuple.h"
#include "llvm/Target/TargetOptions.h"
#include <cassert>
#include <memory>
#include <string>
#include <utility>
namespace llvm {
namespace opt {
class Arg;
class ArgList;
class DerivedArgList;
} // namespace opt
namespace vfs {
class FileSystem;
} // namespace vfs
} // namespace llvm
namespace clang {
class ObjCRuntime;
namespace driver {
class Driver;
class InputInfo;
class SanitizerArgs;
class Tool;
class XRayArgs;
/// Helper structure used to pass information extracted from clang executable
/// name such as `i686-linux-android-g++`.
struct ParsedClangName {
/// Target part of the executable name, as `i686-linux-android`.
std::string TargetPrefix;
/// Driver mode part of the executable name, as `g++`.
std::string ModeSuffix;
/// Corresponding driver mode argument, as '--driver-mode=g++'
const char *DriverMode = nullptr;
/// True if TargetPrefix is recognized as a registered target name.
bool TargetIsValid = false;
ParsedClangName() = default;
ParsedClangName(std::string Suffix, const char *Mode)
: ModeSuffix(Suffix), DriverMode(Mode) {}
ParsedClangName(std::string Target, std::string Suffix, const char *Mode,
bool IsRegistered)
: TargetPrefix(Target), ModeSuffix(Suffix), DriverMode(Mode),
TargetIsValid(IsRegistered) {}
bool isEmpty() const {
return TargetPrefix.empty() && ModeSuffix.empty() && DriverMode == nullptr;
/// ToolChain - Access to tools for a single platform.
class ToolChain {
using path_list = SmallVector<std::string, 16>;
enum CXXStdlibType {
enum RuntimeLibType {
enum RTTIMode {
friend class RegisterEffectiveTriple;
const Driver &D;
llvm::Triple Triple;
const llvm::opt::ArgList &Args;
// We need to initialize CachedRTTIArg before CachedRTTIMode
const llvm::opt::Arg *const CachedRTTIArg;
const RTTIMode CachedRTTIMode;
/// The list of toolchain specific path prefixes to search for libraries.
path_list LibraryPaths;
/// The list of toolchain specific path prefixes to search for files.
path_list FilePaths;
/// The list of toolchain specific path prefixes to search for programs.
path_list ProgramPaths;
mutable std::unique_ptr<Tool> Clang;
mutable std::unique_ptr<Tool> Assemble;
mutable std::unique_ptr<Tool> Link;
mutable std::unique_ptr<Tool> OffloadBundler;
Tool *getClang() const;
Tool *getAssemble() const;
Tool *getLink() const;
Tool *getClangAs() const;
Tool *getOffloadBundler() const;
mutable std::unique_ptr<SanitizerArgs> SanitizerArguments;
mutable std::unique_ptr<XRayArgs> XRayArguments;
/// The effective clang triple for the current Job.
mutable llvm::Triple EffectiveTriple;
/// Set the toolchain's effective clang triple.
void setEffectiveTriple(llvm::Triple ET) const {
EffectiveTriple = std::move(ET);
MultilibSet Multilibs;
Multilib SelectedMultilib;
ToolChain(const Driver &D, const llvm::Triple &T,
const llvm::opt::ArgList &Args);
void setTripleEnvironment(llvm::Triple::EnvironmentType Env);
virtual Tool *buildAssembler() const;
virtual Tool *buildLinker() const;
virtual Tool *getTool(Action::ActionClass AC) const;
/// \name Utilities for implementing subclasses.
static void addSystemInclude(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args,
const Twine &Path);
static void addExternCSystemInclude(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args,
const Twine &Path);
static void
addExternCSystemIncludeIfExists(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args,
const Twine &Path);
static void addSystemIncludes(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args,
ArrayRef<StringRef> Paths);
virtual ~ToolChain();
// Accessors
const Driver &getDriver() const { return D; }
llvm::vfs::FileSystem &getVFS() const;
const llvm::Triple &getTriple() const { return Triple; }
/// Get the toolchain's aux triple, if it has one.
/// Exactly what the aux triple represents depends on the toolchain, but for
/// example when compiling CUDA code for the GPU, the triple might be NVPTX,
/// while the aux triple is the host (CPU) toolchain, e.g. x86-linux-gnu.
virtual const llvm::Triple *getAuxTriple() const { return nullptr; }
/// Some toolchains need to modify the file name, for example to replace the
/// extension for object files with .cubin for OpenMP offloading to Nvidia
/// GPUs.
virtual std::string getInputFilename(const InputInfo &Input) const;
llvm::Triple::ArchType getArch() const { return Triple.getArch(); }
StringRef getArchName() const { return Triple.getArchName(); }
StringRef getPlatform() const { return Triple.getVendorName(); }
StringRef getOS() const { return Triple.getOSName(); }
/// Provide the default architecture name (as expected by -arch) for
/// this toolchain.
StringRef getDefaultUniversalArchName() const;
std::string getTripleString() const {
return Triple.getTriple();
/// Get the toolchain's effective clang triple.
const llvm::Triple &getEffectiveTriple() const {
assert(!EffectiveTriple.getTriple().empty() && "No effective triple");
return EffectiveTriple;
path_list &getLibraryPaths() { return LibraryPaths; }
const path_list &getLibraryPaths() const { return LibraryPaths; }
path_list &getFilePaths() { return FilePaths; }
const path_list &getFilePaths() const { return FilePaths; }
path_list &getProgramPaths() { return ProgramPaths; }
const path_list &getProgramPaths() const { return ProgramPaths; }
const MultilibSet &getMultilibs() const { return Multilibs; }
const Multilib &getMultilib() const { return SelectedMultilib; }
const SanitizerArgs& getSanitizerArgs() const;
const XRayArgs& getXRayArgs() const;
// Returns the Arg * that explicitly turned on/off rtti, or nullptr.
const llvm::opt::Arg *getRTTIArg() const { return CachedRTTIArg; }
// Returns the RTTIMode for the toolchain with the current arguments.
RTTIMode getRTTIMode() const { return CachedRTTIMode; }
/// Return any implicit target and/or mode flag for an invocation of
/// the compiler driver as `ProgName`.
/// For example, when called with i686-linux-android-g++, the first element
/// of the return value will be set to `"i686-linux-android"` and the second
/// will be set to "--driver-mode=g++"`.
/// It is OK if the target name is not registered. In this case the return
/// value contains false in the field TargetIsValid.
/// \pre `llvm::InitializeAllTargets()` has been called.
/// \param ProgName The name the Clang driver was invoked with (from,
/// e.g., argv[0]).
/// \return A structure of type ParsedClangName that contains the executable
/// name parts.
static ParsedClangName getTargetAndModeFromProgramName(StringRef ProgName);
// Tool access.
/// TranslateArgs - Create a new derived argument list for any argument
/// translations this ToolChain may wish to perform, or 0 if no tool chain
/// specific translations are needed. If \p DeviceOffloadKind is specified
/// the translation specific for that offload kind is performed.
/// \param BoundArch - The bound architecture name, or 0.
/// \param DeviceOffloadKind - The device offload kind used for the
/// translation.
virtual llvm::opt::DerivedArgList *
TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
Action::OffloadKind DeviceOffloadKind) const {
return nullptr;
/// TranslateOpenMPTargetArgs - Create a new derived argument list for
/// that contains the OpenMP target specific flags passed via
/// -Xopenmp-target -opt=val OR -Xopenmp-target=<triple> -opt=val
virtual llvm::opt::DerivedArgList *TranslateOpenMPTargetArgs(
const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const;
/// Choose a tool to use to handle the action \p JA.
/// This can be overridden when a particular ToolChain needs to use
/// a compiler other than Clang.
virtual Tool *SelectTool(const JobAction &JA) const;
// Helper methods
std::string GetFilePath(const char *Name) const;
std::string GetProgramPath(const char *Name) const;
/// Returns the linker path, respecting the -fuse-ld= argument to determine
/// the linker suffix or name.
std::string GetLinkerPath() const;
/// Dispatch to the specific toolchain for verbose printing.
/// This is used when handling the verbose option to print detailed,
/// toolchain-specific information useful for understanding the behavior of
/// the driver on a specific platform.
virtual void printVerboseInfo(raw_ostream &OS) const {}
// Platform defaults information
/// Returns true if the toolchain is targeting a non-native
/// architecture.
virtual bool isCrossCompiling() const;
/// HasNativeLTOLinker - Check whether the linker and related tools have
/// native LLVM support.
virtual bool HasNativeLLVMSupport() const;
/// LookupTypeForExtension - Return the default language type to use for the
/// given extension.
virtual types::ID LookupTypeForExtension(StringRef Ext) const;
/// IsBlocksDefault - Does this tool chain enable -fblocks by default.
virtual bool IsBlocksDefault() const { return false; }
/// IsIntegratedAssemblerDefault - Does this tool chain enable -integrated-as
/// by default.
virtual bool IsIntegratedAssemblerDefault() const { return false; }
/// Check if the toolchain should use the integrated assembler.
virtual bool useIntegratedAs() const;
/// IsMathErrnoDefault - Does this tool chain use -fmath-errno by default.
virtual bool IsMathErrnoDefault() const { return true; }
/// IsEncodeExtendedBlockSignatureDefault - Does this tool chain enable
/// -fencode-extended-block-signature by default.
virtual bool IsEncodeExtendedBlockSignatureDefault() const { return false; }
/// IsObjCNonFragileABIDefault - Does this tool chain set
/// -fobjc-nonfragile-abi by default.
virtual bool IsObjCNonFragileABIDefault() const { return false; }
/// UseObjCMixedDispatchDefault - When using non-legacy dispatch, should the
/// mixed dispatch method be used?
virtual bool UseObjCMixedDispatch() const { return false; }
/// Check whether to enable x86 relax relocations by default.
virtual bool useRelaxRelocations() const;
/// GetDefaultStackProtectorLevel - Get the default stack protector level for
/// this tool chain (0=off, 1=on, 2=strong, 3=all).
virtual unsigned GetDefaultStackProtectorLevel(bool KernelOrKext) const {
return 0;
/// GetDefaultLinker - Get the default linker to use.
virtual const char *getDefaultLinker() const { return "ld"; }
/// GetDefaultRuntimeLibType - Get the default runtime library variant to use.
virtual RuntimeLibType GetDefaultRuntimeLibType() const {
return ToolChain::RLT_Libgcc;
virtual CXXStdlibType GetDefaultCXXStdlibType() const {
return ToolChain::CST_Libstdcxx;
virtual std::string getCompilerRTPath() const;
virtual std::string getCompilerRT(const llvm::opt::ArgList &Args,
StringRef Component,
bool Shared = false) const;
const char *getCompilerRTArgString(const llvm::opt::ArgList &Args,
StringRef Component,
bool Shared = false) const;
// Returns <ResourceDir>/lib/<OSName>/<arch>. This is used by runtimes (such
// as OpenMP) to find arch-specific libraries.
std::string getArchSpecificLibPath() const;
// Returns <OSname> part of above.
StringRef getOSLibName() const;
/// needsProfileRT - returns true if instrumentation profile is on.
static bool needsProfileRT(const llvm::opt::ArgList &Args);
/// IsUnwindTablesDefault - Does this tool chain use -funwind-tables
/// by default.
virtual bool IsUnwindTablesDefault(const llvm::opt::ArgList &Args) const;
/// Test whether this toolchain defaults to PIC.
virtual bool isPICDefault() const = 0;
/// Test whether this toolchain defaults to PIE.
virtual bool isPIEDefault() const = 0;
/// Tests whether this toolchain forces its default for PIC, PIE or
/// non-PIC. If this returns true, any PIC related flags should be ignored
/// and instead the results of \c isPICDefault() and \c isPIEDefault() are
/// used exclusively.
virtual bool isPICDefaultForced() const = 0;
/// SupportsProfiling - Does this tool chain support -pg.
virtual bool SupportsProfiling() const { return true; }
/// Complain if this tool chain doesn't support Objective-C ARC.
virtual void CheckObjCARC() const {}
/// UseDwarfDebugFlags - Embed the compile options to clang into the Dwarf
/// compile unit information.
virtual bool UseDwarfDebugFlags() const { return false; }
// Return the DWARF version to emit, in the absence of arguments
// to the contrary.
virtual unsigned GetDefaultDwarfVersion() const { return 4; }
// True if the driver should assume "-fstandalone-debug"
// in the absence of an option specifying otherwise,
// provided that debugging was requested in the first place.
// i.e. a value of 'true' does not imply that debugging is wanted.
virtual bool GetDefaultStandaloneDebug() const { return false; }
// Return the default debugger "tuning."
virtual llvm::DebuggerKind getDefaultDebuggerTuning() const {
return llvm::DebuggerKind::GDB;
/// Does this toolchain supports given debug info option or not.
virtual bool supportsDebugInfoOption(const llvm::opt::Arg *) const {
return true;
/// GetExceptionModel - Return the tool chain exception model.
virtual llvm::ExceptionHandling
GetExceptionModel(const llvm::opt::ArgList &Args) const;
/// SupportsEmbeddedBitcode - Does this tool chain support embedded bitcode.
virtual bool SupportsEmbeddedBitcode() const { return false; }
/// getThreadModel() - Which thread model does this target use?
virtual std::string getThreadModel() const { return "posix"; }
/// isThreadModelSupported() - Does this target support a thread model?
virtual bool isThreadModelSupported(const StringRef Model) const;
/// ComputeLLVMTriple - Return the LLVM target triple to use, after taking
/// command line arguments into account.
virtual std::string
ComputeLLVMTriple(const llvm::opt::ArgList &Args,
types::ID InputType = types::TY_INVALID) const;
/// ComputeEffectiveClangTriple - Return the Clang triple to use for this
/// target, which may take into account the command line arguments. For
/// example, on Darwin the -mmacosx-version-min= command line argument (which
/// sets the deployment target) determines the version in the triple passed to
/// Clang.
virtual std::string ComputeEffectiveClangTriple(
const llvm::opt::ArgList &Args,
types::ID InputType = types::TY_INVALID) const;
/// getDefaultObjCRuntime - Return the default Objective-C runtime
/// for this platform.
/// FIXME: this really belongs on some sort of DeploymentTarget abstraction
virtual ObjCRuntime getDefaultObjCRuntime(bool isNonFragile) const;
/// hasBlocksRuntime - Given that the user is compiling with
/// -fblocks, does this tool chain guarantee the existence of a
/// blocks runtime?
/// FIXME: this really belongs on some sort of DeploymentTarget abstraction
virtual bool hasBlocksRuntime() const { return true; }
/// Add the clang cc1 arguments for system include paths.
/// This routine is responsible for adding the necessary cc1 arguments to
/// include headers from standard system header directories.
virtual void
AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const;
/// Add options that need to be passed to cc1 for this target.
virtual void addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args,
Action::OffloadKind DeviceOffloadKind) const;
/// Add warning options that need to be passed to cc1 for this target.
virtual void addClangWarningOptions(llvm::opt::ArgStringList &CC1Args) const;
// GetRuntimeLibType - Determine the runtime library type to use with the
// given compilation arguments.
virtual RuntimeLibType
GetRuntimeLibType(const llvm::opt::ArgList &Args) const;
// GetCXXStdlibType - Determine the C++ standard library type to use with the
// given compilation arguments.
virtual CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) const;
/// AddClangCXXStdlibIncludeArgs - Add the clang -cc1 level arguments to set
/// the include paths to use for the given C++ standard library type.
virtual void
AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const;
/// Returns if the C++ standard library should be linked in.
/// Note that e.g. -lm should still be linked even if this returns false.
bool ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const;
/// AddCXXStdlibLibArgs - Add the system specific linker arguments to use
/// for the given C++ standard library type.
virtual void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const;
/// AddFilePathLibArgs - Add each thing in getFilePaths() as a "-L" option.
void AddFilePathLibArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const;
/// AddCCKextLibArgs - Add the system specific linker arguments to use
/// for kernel extensions (Darwin-specific).
virtual void AddCCKextLibArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const;
/// AddFastMathRuntimeIfAvailable - If a runtime library exists that sets
/// global flags for unsafe floating point math, add it and return true.
/// This checks for presence of the -Ofast, -ffast-math or -funsafe-math flags.
virtual bool AddFastMathRuntimeIfAvailable(
const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs) const;
/// addProfileRTLibs - When -fprofile-instr-profile is specified, try to pass
/// a suitable profile runtime library to the linker.
virtual void addProfileRTLibs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const;
/// Add arguments to use system-specific CUDA includes.
virtual void AddCudaIncludeArgs(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const;
/// Add arguments to use MCU GCC toolchain includes.
virtual void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const;
/// On Windows, returns the MSVC compatibility version.
virtual VersionTuple computeMSVCVersion(const Driver *D,
const llvm::opt::ArgList &Args) const;
/// Return sanitizers which are available in this toolchain.
virtual SanitizerMask getSupportedSanitizers() const;
/// Return sanitizers which are enabled by default.
virtual SanitizerMask getDefaultSanitizers() const { return 0; }
/// Set a ToolChain's effective triple. Reset it when the registration object
/// is destroyed.
class RegisterEffectiveTriple {
const ToolChain &TC;
RegisterEffectiveTriple(const ToolChain &TC, llvm::Triple T) : TC(TC) {
~RegisterEffectiveTriple() { TC.setEffectiveTriple(llvm::Triple()); }
} // namespace driver
} // namespace clang