Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/lib/Target/BPF/MCTargetDesc/BPFAsmBackend.cpp

@@ -1,118 +0,0 @@
-//===-- BPFAsmBackend.cpp - BPF Assembler Backend -------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "MCTargetDesc/BPFMCTargetDesc.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/MC/MCAsmBackend.h"
-#include "llvm/MC/MCFixup.h"
-#include "llvm/MC/MCObjectWriter.h"
-#include <cassert>
-#include <cstdint>
-
-using namespace llvm;
-
-namespace {
-
-class BPFAsmBackend : public MCAsmBackend {
-public:
-  bool IsLittleEndian;
-
-  BPFAsmBackend(bool IsLittleEndian)
-    : MCAsmBackend(), IsLittleEndian(IsLittleEndian) {}
-  ~BPFAsmBackend() override = default;
-
-  void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
-                  const MCValue &Target, MutableArrayRef<char> Data,
-                  uint64_t Value, bool IsResolved) const override;
-
-  std::unique_ptr<MCObjectWriter>
-  createObjectWriter(raw_pwrite_stream &OS) const override;
-
-  // No instruction requires relaxation
-  bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
-                            const MCRelaxableFragment *DF,
-                            const MCAsmLayout &Layout) const override {
-    return false;
-  }
-
-  unsigned getNumFixupKinds() const override { return 1; }
-
-  bool mayNeedRelaxation(const MCInst &Inst) const override { return false; }
-
-  void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
-                        MCInst &Res) const override {}
-
-  bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
-};
-
-} // end anonymous namespace
-
-bool BPFAsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const {
-  if ((Count % 8) != 0)
-    return false;
-
-  for (uint64_t i = 0; i < Count; i += 8)
-    OW->write64(0x15000000);
-
-  return true;
-}
-
-void BPFAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
-                               const MCValue &Target,
-                               MutableArrayRef<char> Data, uint64_t Value,
-                               bool IsResolved) const {
-  if (Fixup.getKind() == FK_SecRel_4 || Fixup.getKind() == FK_SecRel_8) {
-    assert(Value == 0);
-  } else if (Fixup.getKind() == FK_Data_4 || Fixup.getKind() == FK_Data_8) {
-    unsigned Size = Fixup.getKind() == FK_Data_4 ? 4 : 8;
-
-    for (unsigned i = 0; i != Size; ++i) {
-      unsigned Idx = IsLittleEndian ? i : Size - i - 1;
-      Data[Fixup.getOffset() + Idx] = uint8_t(Value >> (i * 8));
-    }
-  } else if (Fixup.getKind() == FK_PCRel_4) {
-    Value = (uint32_t)((Value - 8) / 8);
-    if (IsLittleEndian) {
-      Data[Fixup.getOffset() + 1] = 0x10;
-      support::endian::write32le(&Data[Fixup.getOffset() + 4], Value);
-    } else {
-      Data[Fixup.getOffset() + 1] = 0x1;
-      support::endian::write32be(&Data[Fixup.getOffset() + 4], Value);
-    }
-  } else {
-    assert(Fixup.getKind() == FK_PCRel_2);
-    Value = (uint16_t)((Value - 8) / 8);
-    if (IsLittleEndian) {
-      Data[Fixup.getOffset() + 2] = Value & 0xFF;
-      Data[Fixup.getOffset() + 3] = Value >> 8;
-    } else {
-      Data[Fixup.getOffset() + 2] = Value >> 8;
-      Data[Fixup.getOffset() + 3] = Value & 0xFF;
-    }
-  }
-}
-
-std::unique_ptr<MCObjectWriter>
-BPFAsmBackend::createObjectWriter(raw_pwrite_stream &OS) const {
-  return createBPFELFObjectWriter(OS, 0, IsLittleEndian);
-}
-
-MCAsmBackend *llvm::createBPFAsmBackend(const Target &T,
-                                        const MCSubtargetInfo &STI,
-                                        const MCRegisterInfo &MRI,
-                                        const MCTargetOptions &) {
-  return new BPFAsmBackend(/*IsLittleEndian=*/true);
-}
-
-MCAsmBackend *llvm::createBPFbeAsmBackend(const Target &T,
-                                          const MCSubtargetInfo &STI,
-                                          const MCRegisterInfo &MRI,
-                                          const MCTargetOptions &) {
-  return new BPFAsmBackend(/*IsLittleEndian=*/false);
-}