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//===- 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 getHostCPUNameForRISCV(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
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