LLVM  9.0.0svn
BPFSubtarget.cpp
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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"
17 
18 using 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 
26 void BPFSubtarget::anchor() {}
27 
29  StringRef FS) {
30  initializeEnvironment();
31  initSubtargetFeatures(CPU, FS);
32  ParseSubtargetFeatures(CPU, FS);
33  return *this;
34 }
35 
36 void BPFSubtarget::initializeEnvironment() {
37  HasJmpExt = false;
38  HasJmp32 = false;
39  HasAlu32 = false;
40  UseDwarfRIS = false;
41 }
42 
43 void BPFSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
44  if (CPU == "probe")
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  return;
56  }
57 }
58 
59 BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU,
60  const std::string &FS, const TargetMachine &TM)
61  : BPFGenSubtargetInfo(TT, CPU, FS), InstrInfo(),
62  FrameLowering(initializeSubtargetDependencies(CPU, FS)),
63  TLInfo(TM, *this) {}
This class represents lattice values for constants.
Definition: AllocatorList.h:23
void ParseSubtargetFeatures(StringRef CPU, StringRef FS)
BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS, const TargetMachine &TM)
StringRef getHostCPUNameForBPF()
Definition: Host.cpp:335
BPFSubtarget & initializeSubtargetDependencies(StringRef CPU, StringRef FS)
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:43
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:65
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48