| //===-- llvm/Target/TargetMachine.h - Target Information --------*- 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the TargetMachine and LLVMTargetMachine classes. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TARGET_TARGETMACHINE_H |
| #define LLVM_TARGET_TARGETMACHINE_H |
| |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/IR/DataLayout.h" |
| #include "llvm/Pass.h" |
| #include "llvm/Support/CodeGen.h" |
| #include "llvm/Target/TargetOptions.h" |
| #include <string> |
| |
| namespace llvm { |
| |
| class Function; |
| class GlobalValue; |
| class MachineModuleInfo; |
| class Mangler; |
| class MCAsmInfo; |
| class MCContext; |
| class MCInstrInfo; |
| class MCRegisterInfo; |
| class MCSubtargetInfo; |
| class MCSymbol; |
| class raw_pwrite_stream; |
| class PassManagerBuilder; |
| class Target; |
| class TargetIntrinsicInfo; |
| class TargetIRAnalysis; |
| class TargetTransformInfo; |
| class TargetLoweringObjectFile; |
| class TargetPassConfig; |
| class TargetSubtargetInfo; |
| |
| // The old pass manager infrastructure is hidden in a legacy namespace now. |
| namespace legacy { |
| class PassManagerBase; |
| } |
| using legacy::PassManagerBase; |
| |
| //===----------------------------------------------------------------------===// |
| /// |
| /// Primary interface to the complete machine description for the target |
| /// machine. All target-specific information should be accessible through this |
| /// interface. |
| /// |
| class TargetMachine { |
| protected: // Can only create subclasses. |
| TargetMachine(const Target &T, StringRef DataLayoutString, |
| const Triple &TargetTriple, StringRef CPU, StringRef FS, |
| const TargetOptions &Options); |
| |
| /// The Target that this machine was created for. |
| const Target &TheTarget; |
| |
| /// DataLayout for the target: keep ABI type size and alignment. |
| /// |
| /// The DataLayout is created based on the string representation provided |
| /// during construction. It is kept here only to avoid reparsing the string |
| /// but should not really be used during compilation, because it has an |
| /// internal cache that is context specific. |
| const DataLayout DL; |
| |
| /// Triple string, CPU name, and target feature strings the TargetMachine |
| /// instance is created with. |
| Triple TargetTriple; |
| std::string TargetCPU; |
| std::string TargetFS; |
| |
| Reloc::Model RM = Reloc::Static; |
| CodeModel::Model CMModel = CodeModel::Small; |
| CodeGenOpt::Level OptLevel = CodeGenOpt::Default; |
| |
| /// Contains target specific asm information. |
| std::unique_ptr<const MCAsmInfo> AsmInfo; |
| std::unique_ptr<const MCRegisterInfo> MRI; |
| std::unique_ptr<const MCInstrInfo> MII; |
| std::unique_ptr<const MCSubtargetInfo> STI; |
| |
| unsigned RequireStructuredCFG : 1; |
| unsigned O0WantsFastISel : 1; |
| |
| public: |
| const TargetOptions DefaultOptions; |
| mutable TargetOptions Options; |
| |
| TargetMachine(const TargetMachine &) = delete; |
| void operator=(const TargetMachine &) = delete; |
| virtual ~TargetMachine(); |
| |
| const Target &getTarget() const { return TheTarget; } |
| |
| const Triple &getTargetTriple() const { return TargetTriple; } |
| StringRef getTargetCPU() const { return TargetCPU; } |
| StringRef getTargetFeatureString() const { return TargetFS; } |
| |
| /// Virtual method implemented by subclasses that returns a reference to that |
| /// target's TargetSubtargetInfo-derived member variable. |
| virtual const TargetSubtargetInfo *getSubtargetImpl(const Function &) const { |
| return nullptr; |
| } |
| virtual TargetLoweringObjectFile *getObjFileLowering() const { |
| return nullptr; |
| } |
| |
| /// This method returns a pointer to the specified type of |
| /// TargetSubtargetInfo. In debug builds, it verifies that the object being |
| /// returned is of the correct type. |
| template <typename STC> const STC &getSubtarget(const Function &F) const { |
| return *static_cast<const STC*>(getSubtargetImpl(F)); |
| } |
| |
| /// Create a DataLayout. |
| const DataLayout createDataLayout() const { return DL; } |
| |
| /// Test if a DataLayout if compatible with the CodeGen for this target. |
| /// |
| /// The LLVM Module owns a DataLayout that is used for the target independent |
| /// optimizations and code generation. This hook provides a target specific |
| /// check on the validity of this DataLayout. |
| bool isCompatibleDataLayout(const DataLayout &Candidate) const { |
| return DL == Candidate; |
| } |
| |
| /// Get the pointer size for this target. |
| /// |
| /// This is the only time the DataLayout in the TargetMachine is used. |
| unsigned getPointerSize(unsigned AS) const { |
| return DL.getPointerSize(AS); |
| } |
| |
| unsigned getPointerSizeInBits(unsigned AS) const { |
| return DL.getPointerSizeInBits(AS); |
| } |
| |
| unsigned getProgramPointerSize() const { |
| return DL.getPointerSize(DL.getProgramAddressSpace()); |
| } |
| |
| unsigned getAllocaPointerSize() const { |
| return DL.getPointerSize(DL.getAllocaAddrSpace()); |
| } |
| |
| /// Reset the target options based on the function's attributes. |
| // FIXME: Remove TargetOptions that affect per-function code generation |
| // from TargetMachine. |
| void resetTargetOptions(const Function &F) const; |
| |
| /// Return target specific asm information. |
| const MCAsmInfo *getMCAsmInfo() const { return AsmInfo.get(); } |
| |
| const MCRegisterInfo *getMCRegisterInfo() const { return MRI.get(); } |
| const MCInstrInfo *getMCInstrInfo() const { return MII.get(); } |
| const MCSubtargetInfo *getMCSubtargetInfo() const { return STI.get(); } |
| |
| /// If intrinsic information is available, return it. If not, return null. |
| virtual const TargetIntrinsicInfo *getIntrinsicInfo() const { |
| return nullptr; |
| } |
| |
| bool requiresStructuredCFG() const { return RequireStructuredCFG; } |
| void setRequiresStructuredCFG(bool Value) { RequireStructuredCFG = Value; } |
| |
| /// Returns the code generation relocation model. The choices are static, PIC, |
| /// and dynamic-no-pic, and target default. |
| Reloc::Model getRelocationModel() const; |
| |
| /// Returns the code model. The choices are small, kernel, medium, large, and |
| /// target default. |
| CodeModel::Model getCodeModel() const; |
| |
| bool isPositionIndependent() const; |
| |
| bool shouldAssumeDSOLocal(const Module &M, const GlobalValue *GV) const; |
| |
| /// Returns true if this target uses emulated TLS. |
| bool useEmulatedTLS() const; |
| |
| /// Returns the TLS model which should be used for the given global variable. |
| TLSModel::Model getTLSModel(const GlobalValue *GV) const; |
| |
| /// Returns the optimization level: None, Less, Default, or Aggressive. |
| CodeGenOpt::Level getOptLevel() const; |
| |
| /// Overrides the optimization level. |
| void setOptLevel(CodeGenOpt::Level Level); |
| |
| void setFastISel(bool Enable) { Options.EnableFastISel = Enable; } |
| bool getO0WantsFastISel() { return O0WantsFastISel; } |
| void setO0WantsFastISel(bool Enable) { O0WantsFastISel = Enable; } |
| void setGlobalISel(bool Enable) { Options.EnableGlobalISel = Enable; } |
| void setGlobalISelAbort(GlobalISelAbortMode Mode) { |
| Options.GlobalISelAbort = Mode; |
| } |
| void setMachineOutliner(bool Enable) { |
| Options.EnableMachineOutliner = Enable; |
| } |
| void setSupportsDefaultOutlining(bool Enable) { |
| Options.SupportsDefaultOutlining = Enable; |
| } |
| |
| bool shouldPrintMachineCode() const { return Options.PrintMachineCode; } |
| |
| bool getUniqueSectionNames() const { return Options.UniqueSectionNames; } |
| |
| /// Return true if data objects should be emitted into their own section, |
| /// corresponds to -fdata-sections. |
| bool getDataSections() const { |
| return Options.DataSections; |
| } |
| |
| /// Return true if functions should be emitted into their own section, |
| /// corresponding to -ffunction-sections. |
| bool getFunctionSections() const { |
| return Options.FunctionSections; |
| } |
| |
| /// Get a \c TargetIRAnalysis appropriate for the target. |
| /// |
| /// This is used to construct the new pass manager's target IR analysis pass, |
| /// set up appropriately for this target machine. Even the old pass manager |
| /// uses this to answer queries about the IR. |
| TargetIRAnalysis getTargetIRAnalysis(); |
| |
| /// Return a TargetTransformInfo for a given function. |
| /// |
| /// The returned TargetTransformInfo is specialized to the subtarget |
| /// corresponding to \p F. |
| virtual TargetTransformInfo getTargetTransformInfo(const Function &F); |
| |
| /// Allow the target to modify the pass manager, e.g. by calling |
| /// PassManagerBuilder::addExtension. |
| virtual void adjustPassManager(PassManagerBuilder &) {} |
| |
| /// These enums are meant to be passed into addPassesToEmitFile to indicate |
| /// what type of file to emit, and returned by it to indicate what type of |
| /// file could actually be made. |
| enum CodeGenFileType { |
| CGFT_AssemblyFile, |
| CGFT_ObjectFile, |
| CGFT_Null // Do not emit any output. |
| }; |
| |
| /// Add passes to the specified pass manager to get the specified file |
| /// emitted. Typically this will involve several steps of code generation. |
| /// This method should return true if emission of this file type is not |
| /// supported, or false on success. |
| /// \p MMI is an optional parameter that, if set to non-nullptr, |
| /// will be used to set the MachineModuloInfo for this PM. |
| virtual bool addPassesToEmitFile(PassManagerBase &, raw_pwrite_stream &, |
| raw_pwrite_stream *, CodeGenFileType, |
| bool /*DisableVerify*/ = true, |
| MachineModuleInfo *MMI = nullptr) { |
| return true; |
| } |
| |
| /// Add passes to the specified pass manager to get machine code emitted with |
| /// the MCJIT. This method returns true if machine code is not supported. It |
| /// fills the MCContext Ctx pointer which can be used to build custom |
| /// MCStreamer. |
| /// |
| virtual bool addPassesToEmitMC(PassManagerBase &, MCContext *&, |
| raw_pwrite_stream &, |
| bool /*DisableVerify*/ = true) { |
| return true; |
| } |
| |
| /// True if subtarget inserts the final scheduling pass on its own. |
| /// |
| /// Branch relaxation, which must happen after block placement, can |
| /// on some targets (e.g. SystemZ) expose additional post-RA |
| /// scheduling opportunities. |
| virtual bool targetSchedulesPostRAScheduling() const { return false; }; |
| |
| void getNameWithPrefix(SmallVectorImpl<char> &Name, const GlobalValue *GV, |
| Mangler &Mang, bool MayAlwaysUsePrivate = false) const; |
| MCSymbol *getSymbol(const GlobalValue *GV) const; |
| }; |
| |
| /// This class describes a target machine that is implemented with the LLVM |
| /// target-independent code generator. |
| /// |
| class LLVMTargetMachine : public TargetMachine { |
| protected: // Can only create subclasses. |
| LLVMTargetMachine(const Target &T, StringRef DataLayoutString, |
| const Triple &TT, StringRef CPU, StringRef FS, |
| const TargetOptions &Options, Reloc::Model RM, |
| CodeModel::Model CM, CodeGenOpt::Level OL); |
| |
| void initAsmInfo(); |
| |
| public: |
| /// Get a TargetTransformInfo implementation for the target. |
| /// |
| /// The TTI returned uses the common code generator to answer queries about |
| /// the IR. |
| TargetTransformInfo getTargetTransformInfo(const Function &F) override; |
| |
| /// Create a pass configuration object to be used by addPassToEmitX methods |
| /// for generating a pipeline of CodeGen passes. |
| virtual TargetPassConfig *createPassConfig(PassManagerBase &PM); |
| |
| /// Add passes to the specified pass manager to get the specified file |
| /// emitted. Typically this will involve several steps of code generation. |
| /// \p MMI is an optional parameter that, if set to non-nullptr, |
| /// will be used to set the MachineModuloInfofor this PM. |
| bool addPassesToEmitFile(PassManagerBase &PM, raw_pwrite_stream &Out, |
| raw_pwrite_stream *DwoOut, CodeGenFileType FileType, |
| bool DisableVerify = true, |
| MachineModuleInfo *MMI = nullptr) override; |
| |
| /// Add passes to the specified pass manager to get machine code emitted with |
| /// the MCJIT. This method returns true if machine code is not supported. It |
| /// fills the MCContext Ctx pointer which can be used to build custom |
| /// MCStreamer. |
| bool addPassesToEmitMC(PassManagerBase &PM, MCContext *&Ctx, |
| raw_pwrite_stream &Out, |
| bool DisableVerify = true) override; |
| |
| /// Returns true if the target is expected to pass all machine verifier |
| /// checks. This is a stopgap measure to fix targets one by one. We will |
| /// remove this at some point and always enable the verifier when |
| /// EXPENSIVE_CHECKS is enabled. |
| virtual bool isMachineVerifierClean() const { return true; } |
| |
| /// Adds an AsmPrinter pass to the pipeline that prints assembly or |
| /// machine code from the MI representation. |
| bool addAsmPrinter(PassManagerBase &PM, raw_pwrite_stream &Out, |
| raw_pwrite_stream *DwoOut, CodeGenFileType FileTYpe, |
| MCContext &Context); |
| |
| /// True if the target uses physical regs at Prolog/Epilog insertion |
| /// time. If true (most machines), all vregs must be allocated before |
| /// PEI. If false (virtual-register machines), then callee-save register |
| /// spilling and scavenging are not needed or used. |
| virtual bool usesPhysRegsForPEI() const { return true; } |
| |
| /// True if the target wants to use interprocedural register allocation by |
| /// default. The -enable-ipra flag can be used to override this. |
| virtual bool useIPRA() const { |
| return false; |
| } |
| }; |
| |
| /// Helper method for getting the code model, returning Default if |
| /// CM does not have a value. The tiny and kernel models will produce |
| /// an error, so targets that support them or require more complex codemodel |
| /// selection logic should implement and call their own getEffectiveCodeModel. |
| inline CodeModel::Model getEffectiveCodeModel(Optional<CodeModel::Model> CM, |
| CodeModel::Model Default) { |
| if (CM) { |
| // By default, targets do not support the tiny and kernel models. |
| if (*CM == CodeModel::Tiny) |
| report_fatal_error("Target does not support the tiny CodeModel"); |
| if (*CM == CodeModel::Kernel) |
| report_fatal_error("Target does not support the kernel CodeModel"); |
| return *CM; |
| } |
| return Default; |
| } |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_TARGET_TARGETMACHINE_H |