lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.cpp

   1 //===- AArch64TargetStreamer.cpp - AArch64TargetStreamer class ------------===//
   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 AArch64TargetStreamer class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "AArch64TargetStreamer.h"
  14 #include "llvm/MC/ConstantPools.h"
  15 #include "llvm/MC/MCSection.h"
  16 #include "llvm/MC/MCSubtargetInfo.h"
  17
  18 using namespace llvm;
  19
  20 //
  21 // AArch64TargetStreamer Implemenation
  22 //
  23 AArch64TargetStreamer::AArch64TargetStreamer(MCStreamer &S)
  24     : MCTargetStreamer(S), ConstantPools(new AssemblerConstantPools()) {}
  25
  26 AArch64TargetStreamer::~AArch64TargetStreamer() = default;
  27
  28 // The constant pool handling is shared by all AArch64TargetStreamer
  29 // implementations.
  30 const MCExpr *AArch64TargetStreamer::addConstantPoolEntry(const MCExpr *Expr,
  31                                                           unsigned Size,
  32                                                           SMLoc Loc) {
  33   return ConstantPools->addEntry(Streamer, Expr, Size, Loc);
  34 }
  35
  36 void AArch64TargetStreamer::emitCurrentConstantPool() {
  37   ConstantPools->emitForCurrentSection(Streamer);
  38 }
  39
  40 // finish() - write out any non-empty assembler constant pools.
  41 void AArch64TargetStreamer::finish() { ConstantPools->emitAll(Streamer); }
  42
  43 void AArch64TargetStreamer::emitInst(uint32_t Inst) {
  44   char Buffer[4];
  45
  46   // We can't just use EmitIntValue here, as that will swap the
  47   // endianness on big-endian systems (instructions are always
  48   // little-endian).
  49   for (unsigned I = 0; I < 4; ++I) {
  50     Buffer[I] = uint8_t(Inst);
  51     Inst >>= 8;
  52   }
  53
  54   getStreamer().EmitBytes(StringRef(Buffer, 4));
  55 }
  56
  57 namespace llvm {
  58
  59 MCTargetStreamer *
  60 createAArch64ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
  61   const Triple &TT = STI.getTargetTriple();
  62   if (TT.isOSBinFormatELF())
  63     return new AArch64TargetELFStreamer(S);
  64   if (TT.isOSBinFormatCOFF())
  65     return new AArch64TargetWinCOFFStreamer(S);
  66   return nullptr;
  67 }
  68
  69 } // end namespace llvm