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
70