1 //===-- BPFSubtarget.cpp - BPF Subtarget Information ----------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the BPF specific subclass of TargetSubtargetInfo.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "BPFSubtarget.h"
15 #include "BPF.h"
16 #include "llvm/Support/Host.h"
17 #include "llvm/Support/TargetRegistry.h"
18 
19 using namespace llvm;
20 
21 #define DEBUG_TYPE "bpf-subtarget"
22 
23 #define GET_SUBTARGETINFO_TARGET_DESC
24 #define GET_SUBTARGETINFO_CTOR
25 #include "BPFGenSubtargetInfo.inc"
26 
27 void BPFSubtarget::anchor() {}
28 
29 BPFSubtarget &BPFSubtarget::initializeSubtargetDependencies(StringRef CPU,
30                                                             StringRef FS) {
31   initializeEnvironment();
32   initSubtargetFeatures(CPU, FS);
33   ParseSubtargetFeatures(CPU, FS);
34   return *this;
35 }
36 
37 void BPFSubtarget::initializeEnvironment() {
38   HasJmpExt = false;
39   HasAlu32 = false;
40   UseDwarfRIS = false;
41 }
42 
43 void 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 }
53 
54 BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU,
55                            const std::string &FS, const TargetMachine &TM)
56     : BPFGenSubtargetInfo(TT, CPU, FS), InstrInfo(),
57       FrameLowering(initializeSubtargetDependencies(CPU, FS)),
58       TLInfo(TM, *this) {}
59