1 //===- lib/MC/MCXCOFFStreamer.cpp - XCOFF Object Output -------------------===//
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 assembles .s files and emits XCOFF .o object files.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "llvm/BinaryFormat/XCOFF.h"
14 #include "llvm/MC/MCAsmBackend.h"
15 #include "llvm/MC/MCCodeEmitter.h"
16 #include "llvm/MC/MCObjectWriter.h"
17 #include "llvm/MC/MCSymbolXCOFF.h"
18 #include "llvm/MC/MCXCOFFStreamer.h"
19 #include "llvm/Support/TargetRegistry.h"
20
21 using namespace llvm;
22
MCXCOFFStreamer(MCContext & Context,std::unique_ptr<MCAsmBackend> MAB,std::unique_ptr<MCObjectWriter> OW,std::unique_ptr<MCCodeEmitter> Emitter)23 MCXCOFFStreamer::MCXCOFFStreamer(MCContext &Context,
24 std::unique_ptr<MCAsmBackend> MAB,
25 std::unique_ptr<MCObjectWriter> OW,
26 std::unique_ptr<MCCodeEmitter> Emitter)
27 : MCObjectStreamer(Context, std::move(MAB), std::move(OW),
28 std::move(Emitter)) {}
29
EmitSymbolAttribute(MCSymbol * Sym,MCSymbolAttr Attribute)30 bool MCXCOFFStreamer::EmitSymbolAttribute(MCSymbol *Sym,
31 MCSymbolAttr Attribute) {
32 auto *Symbol = cast<MCSymbolXCOFF>(Sym);
33 getAssembler().registerSymbol(*Symbol);
34
35 switch (Attribute) {
36 case MCSA_Global:
37 Symbol->setStorageClass(XCOFF::C_EXT);
38 Symbol->setExternal(true);
39 break;
40 default:
41 report_fatal_error("Not implemented yet.");
42 }
43 return true;
44 }
45
EmitCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)46 void MCXCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
47 unsigned ByteAlignment) {
48 getAssembler().registerSymbol(*Symbol);
49 Symbol->setExternal(cast<MCSymbolXCOFF>(Symbol)->getStorageClass() !=
50 XCOFF::C_HIDEXT);
51 Symbol->setCommon(Size, ByteAlignment);
52
53 // Emit the alignment and storage for the variable to the section.
54 EmitValueToAlignment(ByteAlignment);
55 EmitZeros(Size);
56 }
57
EmitZerofill(MCSection * Section,MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment,SMLoc Loc)58 void MCXCOFFStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
59 uint64_t Size, unsigned ByteAlignment,
60 SMLoc Loc) {
61 report_fatal_error("Zero fill not implemented for XCOFF.");
62 }
63
EmitInstToData(const MCInst & Inst,const MCSubtargetInfo & STI)64 void MCXCOFFStreamer::EmitInstToData(const MCInst &Inst,
65 const MCSubtargetInfo &STI) {
66 MCAssembler &Assembler = getAssembler();
67 SmallVector<MCFixup, 4> Fixups;
68 SmallString<256> Code;
69 raw_svector_ostream VecOS(Code);
70 Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
71
72 // TODO: Handle Fixups later
73
74 MCDataFragment *DF = getOrCreateDataFragment(&STI);
75 DF->setHasInstructions(STI);
76 DF->getContents().append(Code.begin(), Code.end());
77 }
78
createXCOFFStreamer(MCContext & Context,std::unique_ptr<MCAsmBackend> && MAB,std::unique_ptr<MCObjectWriter> && OW,std::unique_ptr<MCCodeEmitter> && CE,bool RelaxAll)79 MCStreamer *llvm::createXCOFFStreamer(MCContext &Context,
80 std::unique_ptr<MCAsmBackend> &&MAB,
81 std::unique_ptr<MCObjectWriter> &&OW,
82 std::unique_ptr<MCCodeEmitter> &&CE,
83 bool RelaxAll) {
84 MCXCOFFStreamer *S = new MCXCOFFStreamer(Context, std::move(MAB),
85 std::move(OW), std::move(CE));
86 if (RelaxAll)
87 S->getAssembler().setRelaxAll(true);
88 return S;
89 }
90
EmitXCOFFLocalCommonSymbol(MCSymbol * LabelSym,uint64_t Size,MCSymbol * CsectSym,unsigned ByteAlignment)91 void MCXCOFFStreamer::EmitXCOFFLocalCommonSymbol(MCSymbol *LabelSym,
92 uint64_t Size,
93 MCSymbol *CsectSym,
94 unsigned ByteAlignment) {
95 EmitCommonSymbol(CsectSym, Size, ByteAlignment);
96 }
97