BPFSubtarget.cpp revision 360784 
1//===-- BPFSubtarget.cpp - BPF Subtarget Information ----------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the BPF specific subclass of TargetSubtargetInfo.
10//
11//===----------------------------------------------------------------------===//
12
13#include "BPFSubtarget.h"
14#include "BPF.h"
15#include "llvm/Support/Host.h"
16#include "llvm/Support/TargetRegistry.h"
17
18using namespace llvm;
19
20#define DEBUG_TYPE "bpf-subtarget"
21
22#define GET_SUBTARGETINFO_TARGET_DESC
23#define GET_SUBTARGETINFO_CTOR
24#include "BPFGenSubtargetInfo.inc"
25
26void BPFSubtarget::anchor() {}
27
28BPFSubtarget &BPFSubtarget::initializeSubtargetDependencies(StringRef CPU,
29                                                            StringRef FS) {
30  initializeEnvironment();
31  initSubtargetFeatures(CPU, FS);
32  ParseSubtargetFeatures(CPU, FS);
33  return *this;
34}
35
36void BPFSubtarget::initializeEnvironment() {
37  HasJmpExt = false;
38  HasJmp32 = false;
39  HasAlu32 = false;
40  UseDwarfRIS = false;
41}
42
43void BPFSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
44  if (CPU == "probe")
45    CPU = sys::detail::getHostCPUNameForBPF();
46  if (CPU == "generic" || CPU == "v1")
47    return;
48  if (CPU == "v2") {
49    HasJmpExt = true;
50    return;
51  }
52  if (CPU == "v3") {
53    HasJmpExt = true;
54    HasJmp32 = true;
55    HasAlu32 = true;
56    return;
57  }
58}
59
60BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU,
61                           const std::string &FS, const TargetMachine &TM)
62    : BPFGenSubtargetInfo(TT, CPU, FS), InstrInfo(),
63      FrameLowering(initializeSubtargetDependencies(CPU, FS)),
64      TLInfo(TM, *this) {}
65