LLVM  9.0.0svn
PPCMCTargetDesc.cpp
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1 //===-- PPCMCTargetDesc.cpp - PowerPC Target Descriptions -----------------===//
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 provides PowerPC specific target descriptions.
10 //
11 //===----------------------------------------------------------------------===//
12 
16 #include "PPCTargetStreamer.h"
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/ADT/Triple.h"
19 #include "llvm/BinaryFormat/ELF.h"
20 #include "llvm/MC/MCAssembler.h"
21 #include "llvm/MC/MCContext.h"
22 #include "llvm/MC/MCDwarf.h"
23 #include "llvm/MC/MCELFStreamer.h"
24 #include "llvm/MC/MCExpr.h"
25 #include "llvm/MC/MCInstrInfo.h"
26 #include "llvm/MC/MCRegisterInfo.h"
27 #include "llvm/MC/MCStreamer.h"
29 #include "llvm/MC/MCSymbol.h"
30 #include "llvm/MC/MCSymbolELF.h"
31 #include "llvm/Support/Casting.h"
32 #include "llvm/Support/CodeGen.h"
37 
38 using namespace llvm;
39 
40 #define GET_INSTRINFO_MC_DESC
41 #include "PPCGenInstrInfo.inc"
42 
43 #define GET_SUBTARGETINFO_MC_DESC
44 #include "PPCGenSubtargetInfo.inc"
45 
46 #define GET_REGINFO_MC_DESC
47 #include "PPCGenRegisterInfo.inc"
48 
49 // Pin the vtable to this file.
51 
53 
55  MCInstrInfo *X = new MCInstrInfo();
56  InitPPCMCInstrInfo(X);
57  return X;
58 }
59 
61  bool isPPC64 =
62  (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le);
63  unsigned Flavour = isPPC64 ? 0 : 1;
64  unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR;
65 
67  InitPPCMCRegisterInfo(X, RA, Flavour, Flavour);
68  return X;
69 }
70 
72  StringRef CPU, StringRef FS) {
73  return createPPCMCSubtargetInfoImpl(TT, CPU, FS);
74 }
75 
77  const Triple &TheTriple) {
78  bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
79  TheTriple.getArch() == Triple::ppc64le);
80 
81  MCAsmInfo *MAI;
82  if (TheTriple.isOSDarwin())
83  MAI = new PPCMCAsmInfoDarwin(isPPC64, TheTriple);
84  else
85  MAI = new PPCELFMCAsmInfo(isPPC64, TheTriple);
86 
87  // Initial state of the frame pointer is R1.
88  unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1;
89  MCCFIInstruction Inst =
90  MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0);
91  MAI->addInitialFrameState(Inst);
92 
93  return MAI;
94 }
95 
96 namespace {
97 
98 class PPCTargetAsmStreamer : public PPCTargetStreamer {
100 
101 public:
102  PPCTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS)
103  : PPCTargetStreamer(S), OS(OS) {}
104 
105  void emitTCEntry(const MCSymbol &S) override {
106  OS << "\t.tc ";
107  OS << S.getName();
108  OS << "[TC],";
109  OS << S.getName();
110  OS << '\n';
111  }
112 
113  void emitMachine(StringRef CPU) override {
114  OS << "\t.machine " << CPU << '\n';
115  }
116 
117  void emitAbiVersion(int AbiVersion) override {
118  OS << "\t.abiversion " << AbiVersion << '\n';
119  }
120 
121  void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
122  const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
123 
124  OS << "\t.localentry\t";
125  S->print(OS, MAI);
126  OS << ", ";
127  LocalOffset->print(OS, MAI);
128  OS << '\n';
129  }
130 };
131 
132 class PPCTargetELFStreamer : public PPCTargetStreamer {
133 public:
134  PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
135 
137  return static_cast<MCELFStreamer &>(Streamer);
138  }
139 
140  void emitTCEntry(const MCSymbol &S) override {
141  // Creates a R_PPC64_TOC relocation
143  Streamer.EmitSymbolValue(&S, 8);
144  }
145 
146  void emitMachine(StringRef CPU) override {
147  // FIXME: Is there anything to do in here or does this directive only
148  // limit the parser?
149  }
150 
151  void emitAbiVersion(int AbiVersion) override {
152  MCAssembler &MCA = getStreamer().getAssembler();
153  unsigned Flags = MCA.getELFHeaderEFlags();
154  Flags &= ~ELF::EF_PPC64_ABI;
155  Flags |= (AbiVersion & ELF::EF_PPC64_ABI);
156  MCA.setELFHeaderEFlags(Flags);
157  }
158 
159  void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
160  MCAssembler &MCA = getStreamer().getAssembler();
161 
162  int64_t Res;
163  if (!LocalOffset->evaluateAsAbsolute(Res, MCA))
164  report_fatal_error(".localentry expression must be absolute.");
165 
166  unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res);
167  if (Res != ELF::decodePPC64LocalEntryOffset(Encoded))
168  report_fatal_error(".localentry expression cannot be encoded.");
169 
170  unsigned Other = S->getOther();
171  Other &= ~ELF::STO_PPC64_LOCAL_MASK;
172  Other |= Encoded;
173  S->setOther(Other);
174 
175  // For GAS compatibility, unless we already saw a .abiversion directive,
176  // set e_flags to indicate ELFv2 ABI.
177  unsigned Flags = MCA.getELFHeaderEFlags();
178  if ((Flags & ELF::EF_PPC64_ABI) == 0)
179  MCA.setELFHeaderEFlags(Flags | 2);
180  }
181 
182  void emitAssignment(MCSymbol *S, const MCExpr *Value) override {
183  auto *Symbol = cast<MCSymbolELF>(S);
184  // When encoding an assignment to set symbol A to symbol B, also copy
185  // the st_other bits encoding the local entry point offset.
186  if (Value->getKind() != MCExpr::SymbolRef)
187  return;
188  const auto &RhsSym = cast<MCSymbolELF>(
189  static_cast<const MCSymbolRefExpr *>(Value)->getSymbol());
190  unsigned Other = Symbol->getOther();
191  Other &= ~ELF::STO_PPC64_LOCAL_MASK;
192  Other |= RhsSym.getOther() & ELF::STO_PPC64_LOCAL_MASK;
193  Symbol->setOther(Other);
194  }
195 };
196 
197 class PPCTargetMachOStreamer : public PPCTargetStreamer {
198 public:
199  PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
200 
201  void emitTCEntry(const MCSymbol &S) override {
202  llvm_unreachable("Unknown pseudo-op: .tc");
203  }
204 
205  void emitMachine(StringRef CPU) override {
206  // FIXME: We should update the CPUType, CPUSubType in the Object file if
207  // the new values are different from the defaults.
208  }
209 
210  void emitAbiVersion(int AbiVersion) override {
211  llvm_unreachable("Unknown pseudo-op: .abiversion");
212  }
213 
214  void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
215  llvm_unreachable("Unknown pseudo-op: .localentry");
216  }
217 };
218 
219 } // end anonymous namespace
220 
223  MCInstPrinter *InstPrint,
224  bool isVerboseAsm) {
225  return new PPCTargetAsmStreamer(S, OS);
226 }
227 
228 static MCTargetStreamer *
230  const Triple &TT = STI.getTargetTriple();
231  if (TT.isOSBinFormatELF())
232  return new PPCTargetELFStreamer(S);
233  return new PPCTargetMachOStreamer(S);
234 }
235 
237  unsigned SyntaxVariant,
238  const MCAsmInfo &MAI,
239  const MCInstrInfo &MII,
240  const MCRegisterInfo &MRI) {
241  return new PPCInstPrinter(MAI, MII, MRI, T);
242 }
243 
244 extern "C" void LLVMInitializePowerPCTargetMC() {
245  for (Target *T :
247  // Register the MC asm info.
249 
250  // Register the MC instruction info.
252 
253  // Register the MC register info.
255 
256  // Register the MC subtarget info.
258 
259  // Register the MC Code Emitter
261 
262  // Register the asm backend.
264 
265  // Register the object target streamer.
268 
269  // Register the asm target streamer.
271 
272  // Register the MCInstPrinter.
274  }
275 }
const MCAsmInfo * getAsmInfo() const
Definition: MCContext.h:292
uint64_t CallInst * C
void setELFHeaderEFlags(unsigned Flags)
Definition: MCAssembler.h:255
bool isOSDarwin() const
isOSDarwin - Is this a "Darwin" OS (OS X, iOS, or watchOS).
Definition: Triple.h:476
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:139
This class represents lattice values for constants.
Definition: AllocatorList.h:23
void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, bool IsSectionRelative=false)
Special case of EmitValue that avoids the client having to pass in a MCExpr for MCSymbols.
Definition: MCStreamer.cpp:163
static MCAsmInfo * createPPCMCAsmInfo(const MCRegisterInfo &MRI, const Triple &TheTriple)
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
bool isOSBinFormatELF() const
Tests whether the OS uses the ELF binary format.
Definition: Triple.h:614
formatted_raw_ostream - A raw_ostream that wraps another one and keeps track of line and column posit...
Target specific streamer interface.
Definition: MCStreamer.h:83
unsigned Reg
Target & getThePPC32Target()
static void RegisterMCInstPrinter(Target &T, Target::MCInstPrinterCtorTy Fn)
RegisterMCInstPrinter - Register a MCInstPrinter implementation for the given target.
static void RegisterAsmTargetStreamer(Target &T, Target::AsmTargetStreamerCtorTy Fn)
const Triple & getTargetTriple() const
SI optimize exec mask operations pre RA
MCContext & getContext() const
Definition: MCStreamer.h:250
static int64_t decodePPC64LocalEntryOffset(unsigned Other)
Definition: ELF.h:392
~PPCTargetStreamer() override
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
Represent a reference to a symbol from inside an expression.
Definition: MCExpr.h:165
int getDwarfRegNum(unsigned RegNum, bool isEH) const
Map a target register to an equivalent dwarf register number.
static unsigned encodePPC64LocalEntryOffset(int64_t Offset)
Definition: ELF.h:396
ELFYAML::ELF_STO Other
Definition: ELFYAML.cpp:849
ArchType getArch() const
getArch - Get the parsed architecture type of this triple.
Definition: Triple.h:291
virtual void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset)=0
Target & getThePPC64Target()
unsigned getOther() const
void LLVMInitializePowerPCTargetMC()
Expected< const typename ELFT::Sym * > getSymbol(typename ELFT::SymRange Symbols, uint32_t Index)
Definition: ELF.h:334
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:55
static void RegisterMCAsmBackend(Target &T, Target::MCAsmBackendCtorTy Fn)
RegisterMCAsmBackend - Register a MCAsmBackend implementation for the given target.
Streaming machine code generation interface.
Definition: MCStreamer.h:188
void print(raw_ostream &OS, const MCAsmInfo *MAI, bool InParens=false) const
Definition: MCExpr.cpp:41
unsigned const MachineRegisterInfo * MRI
static MCCFIInstruction createDefCfa(MCSymbol *L, unsigned Register, int Offset)
.cfi_def_cfa defines a rule for computing CFA as: take address from Register and add Offset to it...
Definition: MCDwarf.h:477
void setOther(unsigned Other)
virtual void emitAbiVersion(int AbiVersion)=0
Interface to description of machine instruction set.
Definition: MCInstrInfo.h:23
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value=0, unsigned ValueSize=1, unsigned MaxBytesToEmit=0)
Emit some number of copies of Value until the byte alignment ByteAlignment is reached.
MCAsmBackend * createPPCAsmBackend(const Target &T, const MCSubtargetInfo &STI, const MCRegisterInfo &MRI, const MCTargetOptions &Options)
static MCInstPrinter * createPPCMCInstPrinter(const Triple &T, unsigned SyntaxVariant, const MCAsmInfo &MAI, const MCInstrInfo &MII, const MCRegisterInfo &MRI)
unsigned getELFHeaderEFlags() const
ELF e_header flags.
Definition: MCAssembler.h:254
static void RegisterMCSubtargetInfo(Target &T, Target::MCSubtargetInfoCtorFnTy Fn)
RegisterMCSubtargetInfo - Register a MCSubtargetInfo implementation for the given target...
static void RegisterObjectTargetStreamer(Target &T, Target::ObjectTargetStreamerCtorTy Fn)
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
static MCInstrInfo * createPPCMCInstrInfo()
static MCSubtargetInfo * createPPCMCSubtargetInfo(const Triple &TT, StringRef CPU, StringRef FS)
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:43
MCStreamer & getStreamer()
Definition: MCStreamer.h:91
void addInitialFrameState(const MCCFIInstruction &Inst)
Definition: MCAsmInfo.cpp:73
ExprKind getKind() const
Definition: MCExpr.h:72
static void RegisterMCCodeEmitter(Target &T, Target::MCCodeEmitterCtorTy Fn)
RegisterMCCodeEmitter - Register a MCCodeEmitter implementation for the given target.
MCStreamer & Streamer
Definition: MCStreamer.h:85
static void RegisterMCRegInfo(Target &T, Target::MCRegInfoCtorFnTy Fn)
RegisterMCRegInfo - Register a MCRegisterInfo implementation for the given target.
Target - Wrapper for Target specific information.
Target & getThePPC64LETarget()
static MCRegisterInfo * createPPCMCRegisterInfo(const Triple &TT)
This is an instance of a target assembly language printer that converts an MCInst to valid target ass...
Definition: MCInstPrinter.h:39
static void RegisterMCInstrInfo(Target &T, Target::MCInstrInfoCtorFnTy Fn)
RegisterMCInstrInfo - Register a MCInstrInfo implementation for the given target. ...
Generic base class for all target subtargets.
static MCTargetStreamer * createAsmTargetStreamer(MCStreamer &S, formatted_raw_ostream &OS, MCInstPrinter *InstPrint, bool isVerboseAsm)
References to labels and assigned expressions.
Definition: MCExpr.h:40
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:202
PPCTargetStreamer(MCStreamer &S)
RegisterMCAsmInfoFn - Helper template for registering a target assembly info implementation.
LLVM Value Representation.
Definition: Value.h:72
virtual void emitTCEntry(const MCSymbol &S)=0
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
virtual void emitMachine(StringRef CPU)=0
static MCTargetStreamer * createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI)
virtual void emitAssignment(MCSymbol *Symbol, const MCExpr *Value)
Definition: MCStreamer.cpp:86
MCCodeEmitter * createPPCMCCodeEmitter(const MCInstrInfo &MCII, const MCRegisterInfo &MRI, MCContext &Ctx)
void print(raw_ostream &OS, const MCAsmInfo *MAI) const
print - Print the value to the stream OS.
Definition: MCSymbol.cpp:59