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fbb662f840
In r143502, we renamed getHostTriple() to getDefaultTargetTriple() as part of work to allow the user to supply a different default target triple at configure time. This change also affected the JIT. However, it is inappropriate to use the default target triple in the JIT in most circumstances because this will not necessarily match the current architecture used by the process, leading to illegal instruction and other such errors at run time. Introduce the getProcessTriple() function for use in the JIT and its clients, and cause the JIT to use it. On architectures with a single bitness, the host and process triples are identical. On other architectures, the host triple represents the architecture of the host CPU, while the process triple represents the architecture used by the host CPU to interpret machine code within the current process. For example, when executing 32-bit code on a 64-bit Linux machine, the host triple may be 'x86_64-unknown-linux-gnu', while the process triple may be 'i386-unknown-linux-gnu'. This fixes JIT for the 32-on-64-bit (and vice versa) build on non-Apple platforms. Differential Revision: http://llvm-reviews.chandlerc.com/D254 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172627 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//===- llvm/Support/Host.h - Host machine characteristics --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Methods for querying the nature of the host machine.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_HOST_H
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#define LLVM_SUPPORT_HOST_H
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#include "llvm/ADT/StringMap.h"
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#include <string>
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namespace llvm {
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namespace sys {
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inline bool isLittleEndianHost() {
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union {
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int i;
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char c;
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};
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i = 1;
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return c;
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}
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inline bool isBigEndianHost() {
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return !isLittleEndianHost();
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}
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/// getDefaultTargetTriple() - Return the default target triple the compiler
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/// has been configured to produce code for.
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///
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/// The target triple is a string in the format of:
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/// CPU_TYPE-VENDOR-OPERATING_SYSTEM
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/// or
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/// CPU_TYPE-VENDOR-KERNEL-OPERATING_SYSTEM
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std::string getDefaultTargetTriple();
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/// getProcessTriple() - Return an appropriate target triple for generating
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/// code to be loaded into the current process, e.g. when using the JIT.
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std::string getProcessTriple();
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/// getHostCPUName - Get the LLVM name for the host CPU. The particular format
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/// of the name is target dependent, and suitable for passing as -mcpu to the
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/// target which matches the host.
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///
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/// \return - The host CPU name, or empty if the CPU could not be determined.
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std::string getHostCPUName();
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/// getHostCPUFeatures - Get the LLVM names for the host CPU features.
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/// The particular format of the names are target dependent, and suitable for
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/// passing as -mattr to the target which matches the host.
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///
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/// \param Features - A string mapping feature names to either
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/// true (if enabled) or false (if disabled). This routine makes no guarantees
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/// about exactly which features may appear in this map, except that they are
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/// all valid LLVM feature names.
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///
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/// \return - True on success.
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bool getHostCPUFeatures(StringMap<bool> &Features);
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}
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}
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#endif
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