1//===- PPCELFStreamer.h - ELF Object Output --------------------*- C++ -*-===//
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 is a custom MCELFStreamer for PowerPC.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H
14#define LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H
15
16#include "llvm/MC/MCELFStreamer.h"
17#include <memory>
18
19namespace llvm {
20
21class MCAsmBackend;
22class MCCodeEmitter;
23class MCContext;
24class MCSubtargetInfo;
25
26class PPCELFStreamer : public MCELFStreamer {
27 // We need to keep track of the last label we emitted (only one) because
28 // depending on whether the label is on the same line as an aligned
29 // instruction or not, the label may refer to the instruction or the nop.
30 MCSymbol *LastLabel;
31 SMLoc LastLabelLoc;
32
33public:
34 PPCELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
35 std::unique_ptr<MCObjectWriter> OW,
36 std::unique_ptr<MCCodeEmitter> Emitter);
37
38 void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
39
40 // EmitLabel updates LastLabel and LastLabelLoc when a new label is emitted.
41 void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
42private:
43 void emitPrefixedInstruction(const MCInst &Inst, const MCSubtargetInfo &STI);
44 void emitGOTToPCRelReloc(const MCInst &Inst);
45 void emitGOTToPCRelLabel(const MCInst &Inst);
46};
47
48// Check if the instruction Inst is part of a pair of instructions that make up
49// a link time GOT PC Rel optimization.
50std::optional<bool> isPartOfGOTToPCRelPair(const MCInst &Inst,
51 const MCSubtargetInfo &STI);
52
53MCStreamer *createPPCELFStreamer(const Triple &, MCContext &,
54 std::unique_ptr<MCAsmBackend> &&MAB,
55 std::unique_ptr<MCObjectWriter> &&OW,
56 std::unique_ptr<MCCodeEmitter> &&Emitter);
57} // end namespace llvm
58
59#endif // LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H
60