| //===- llvm/Support/Host.h - Host machine characteristics --------*- 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Methods for querying the nature of the host machine. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_SUPPORT_HOST_H |
| #define LLVM_SUPPORT_HOST_H |
| |
| #include <string> |
| |
| namespace llvm { |
| class MallocAllocator; |
| class StringRef; |
| template <typename ValueTy, typename AllocatorTy> class StringMap; |
| |
| namespace sys { |
| |
| /// getDefaultTargetTriple() - Return the default target triple the compiler |
| /// has been configured to produce code for. |
| /// |
| /// The target triple is a string in the format of: |
| /// CPU_TYPE-VENDOR-OPERATING_SYSTEM |
| /// or |
| /// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM |
| std::string getDefaultTargetTriple(); |
| |
| /// getProcessTriple() - Return an appropriate target triple for generating |
| /// code to be loaded into the current process, e.g. when using the JIT. |
| std::string getProcessTriple(); |
| |
| /// getHostCPUName - Get the LLVM name for the host CPU. The particular format |
| /// of the name is target dependent, and suitable for passing as -mcpu to the |
| /// target which matches the host. |
| /// |
| /// \return - The host CPU name, or empty if the CPU could not be determined. |
| StringRef getHostCPUName(); |
| |
| /// getHostCPUFeatures - Get the LLVM names for the host CPU features. |
| /// The particular format of the names are target dependent, and suitable for |
| /// passing as -mattr to the target which matches the host. |
| /// |
| /// \param Features - A string mapping feature names to either |
| /// true (if enabled) or false (if disabled). This routine makes no guarantees |
| /// about exactly which features may appear in this map, except that they are |
| /// all valid LLVM feature names. |
| /// |
| /// \return - True on success. |
| bool getHostCPUFeatures(StringMap<bool, MallocAllocator> &Features); |
| |
| /// Get the number of physical cores (as opposed to logical cores returned |
| /// from thread::hardware_concurrency(), which includes hyperthreads). |
| /// Returns -1 if unknown for the current host system. |
| int getHostNumPhysicalCores(); |
| |
| namespace detail { |
| /// Helper functions to extract HostCPUName from /proc/cpuinfo on linux. |
| StringRef getHostCPUNameForPowerPC(StringRef ProcCpuinfoContent); |
| StringRef getHostCPUNameForARM(StringRef ProcCpuinfoContent); |
| StringRef getHostCPUNameForS390x(StringRef ProcCpuinfoContent); |
| StringRef getHostCPUNameForBPF(); |
| |
| /// Helper functions to extract CPU details from CPUID on x86. |
| namespace x86 { |
| enum class VendorSignatures { |
| UNKNOWN, |
| GENUINE_INTEL, |
| AUTHENTIC_AMD, |
| }; |
| |
| /// Returns the host CPU's vendor. |
| /// MaxLeaf: if a non-nullptr pointer is specified, the EAX value will be |
| /// assigned to its pointee. |
| VendorSignatures getVendorSignature(unsigned *MaxLeaf = nullptr); |
| } // namespace x86 |
| } |
| } |
| } |
| |
| #endif |