LLVM  14.0.0git
PPCELFStreamer.h
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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/ADT/SmallVector.h"
17 #include "llvm/MC/MCELFStreamer.h"
18 #include <memory>
19 
20 namespace llvm {
21 
22 class MCAsmBackend;
23 class MCCodeEmitter;
24 class MCContext;
25 class MCSubtargetInfo;
26 
27 class PPCELFStreamer : public MCELFStreamer {
28  // We need to keep track of the last label we emitted (only one) because
29  // depending on whether the label is on the same line as an aligned
30  // instruction or not, the label may refer to the instruction or the nop.
31  MCSymbol *LastLabel;
32  SMLoc LastLabelLoc;
33 
34 public:
35  PPCELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
36  std::unique_ptr<MCObjectWriter> OW,
37  std::unique_ptr<MCCodeEmitter> Emitter);
38 
39  void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
40 
41  // EmitLabel updates LastLabel and LastLabelLoc when a new label is emitted.
42  void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
43 private:
44  void emitPrefixedInstruction(const MCInst &Inst, const MCSubtargetInfo &STI);
45  void emitGOTToPCRelReloc(const MCInst &Inst);
46  void emitGOTToPCRelLabel(const MCInst &Inst);
47 };
48 
49 // Check if the instruction Inst is part of a pair of instructions that make up
50 // a link time GOT PC Rel optimization.
52  const MCSubtargetInfo &STI);
53 
55  std::unique_ptr<MCAsmBackend> MAB,
56  std::unique_ptr<MCObjectWriter> OW,
57  std::unique_ptr<MCCodeEmitter> Emitter);
58 } // end namespace llvm
59 
60 #endif // LLVM_LIB_TARGET_PPC_MCELFSTREAMER_PPCELFSTREAMER_H
llvm
This is an optimization pass for GlobalISel generic memory operations.
Definition: AllocatorList.h:23
llvm::MCSymbol
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
llvm::MCContext
Context object for machine code objects.
Definition: MCContext.h:72
llvm::Optional< bool >
llvm::PPCELFStreamer::emitInstruction
void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override
Emit the given Instruction into the current section.
Definition: PPCELFStreamer.cpp:87
llvm::MCInst
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:184
llvm::PPCELFStreamer
Definition: PPCELFStreamer.h:27
MCELFStreamer.h
Context
ManagedStatic< detail::RecordContext > Context
Definition: Record.cpp:96
llvm::MCELFStreamer
Definition: MCELFStreamer.h:24
llvm::SMLoc
Represents a location in source code.
Definition: SMLoc.h:23
llvm::PPCELFStreamer::PPCELFStreamer
PPCELFStreamer(MCContext &Context, std::unique_ptr< MCAsmBackend > MAB, std::unique_ptr< MCObjectWriter > OW, std::unique_ptr< MCCodeEmitter > Emitter)
Definition: PPCELFStreamer.cpp:39
llvm::PPCELFStreamer::emitLabel
void emitLabel(MCSymbol *Symbol, SMLoc Loc=SMLoc()) override
Emit a label for Symbol into the current section.
Definition: PPCELFStreamer.cpp:121
llvm::createPPCELFStreamer
MCELFStreamer * createPPCELFStreamer(MCContext &Context, std::unique_ptr< MCAsmBackend > MAB, std::unique_ptr< MCObjectWriter > OW, std::unique_ptr< MCCodeEmitter > Emitter)
Definition: PPCELFStreamer.cpp:223
llvm::isPartOfGOTToPCRelPair
Optional< bool > isPartOfGOTToPCRelPair(const MCInst &Inst, const MCSubtargetInfo &STI)
Definition: PPCELFStreamer.cpp:200
llvm::ARMBuildAttrs::Symbol
@ Symbol
Definition: ARMBuildAttributes.h:83
SmallVector.h
llvm::MCSubtargetInfo
Generic base class for all target subtargets.
Definition: MCSubtargetInfo.h:75