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"
18 #include "llvm/ADT/SmallPtrSet.h"
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/ADT/Triple.h"
21 #include "llvm/BinaryFormat/ELF.h"
22 #include "llvm/MC/MCAssembler.h"
23 #include "llvm/MC/MCContext.h"
24 #include "llvm/MC/MCDwarf.h"
25 #include "llvm/MC/MCELFStreamer.h"
26 #include "llvm/MC/MCExpr.h"
27 #include "llvm/MC/MCInstrInfo.h"
28 #include "llvm/MC/MCRegisterInfo.h"
29 #include "llvm/MC/MCStreamer.h"
31 #include "llvm/MC/MCSymbol.h"
32 #include "llvm/MC/MCSymbolELF.h"
33 #include "llvm/Support/Casting.h"
34 #include "llvm/Support/CodeGen.h"
39 
40 using namespace llvm;
41 
42 #define GET_INSTRINFO_MC_DESC
43 #include "PPCGenInstrInfo.inc"
44 
45 #define GET_SUBTARGETINFO_MC_DESC
46 #include "PPCGenSubtargetInfo.inc"
47 
48 #define GET_REGINFO_MC_DESC
49 #include "PPCGenRegisterInfo.inc"
50 
51 // Pin the vtable to this file.
53 
55 
57  MCInstrInfo *X = new MCInstrInfo();
58  InitPPCMCInstrInfo(X);
59  return X;
60 }
61 
63  bool isPPC64 =
64  (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le);
65  unsigned Flavour = isPPC64 ? 0 : 1;
66  unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR;
67 
69  InitPPCMCRegisterInfo(X, RA, Flavour, Flavour);
70  return X;
71 }
72 
74  StringRef CPU, StringRef FS) {
75  return createPPCMCSubtargetInfoImpl(TT, CPU, FS);
76 }
77 
79  const Triple &TheTriple) {
80  bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
81  TheTriple.getArch() == Triple::ppc64le);
82 
83  MCAsmInfo *MAI;
84  if (TheTriple.isOSDarwin())
85  MAI = new PPCMCAsmInfoDarwin(isPPC64, TheTriple);
86  else
87  MAI = new PPCELFMCAsmInfo(isPPC64, TheTriple);
88 
89  // Initial state of the frame pointer is R1.
90  unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1;
91  MCCFIInstruction Inst =
92  MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0);
93  MAI->addInitialFrameState(Inst);
94 
95  return MAI;
96 }
97 
98 namespace {
99 
100 class PPCTargetAsmStreamer : public PPCTargetStreamer {
102 
103 public:
104  PPCTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS)
105  : PPCTargetStreamer(S), OS(OS) {}
106 
107  void emitTCEntry(const MCSymbol &S) override {
108  OS << "\t.tc ";
109  OS << S.getName();
110  OS << "[TC],";
111  OS << S.getName();
112  OS << '\n';
113  }
114 
115  void emitMachine(StringRef CPU) override {
116  OS << "\t.machine " << CPU << '\n';
117  }
118 
119  void emitAbiVersion(int AbiVersion) override {
120  OS << "\t.abiversion " << AbiVersion << '\n';
121  }
122 
123  void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
124  const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
125 
126  OS << "\t.localentry\t";
127  S->print(OS, MAI);
128  OS << ", ";
129  LocalOffset->print(OS, MAI);
130  OS << '\n';
131  }
132 };
133 
134 class PPCTargetELFStreamer : public PPCTargetStreamer {
135 public:
136  PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
137 
139  return static_cast<MCELFStreamer &>(Streamer);
140  }
141 
142  void emitTCEntry(const MCSymbol &S) override {
143  // Creates a R_PPC64_TOC relocation
145  Streamer.EmitSymbolValue(&S, 8);
146  }
147 
148  void emitMachine(StringRef CPU) override {
149  // FIXME: Is there anything to do in here or does this directive only
150  // limit the parser?
151  }
152 
153  void emitAbiVersion(int AbiVersion) override {
154  MCAssembler &MCA = getStreamer().getAssembler();
155  unsigned Flags = MCA.getELFHeaderEFlags();
156  Flags &= ~ELF::EF_PPC64_ABI;
157  Flags |= (AbiVersion & ELF::EF_PPC64_ABI);
158  MCA.setELFHeaderEFlags(Flags);
159  }
160 
161  void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
162  MCAssembler &MCA = getStreamer().getAssembler();
163 
164  int64_t Res;
165  if (!LocalOffset->evaluateAsAbsolute(Res, MCA))
166  report_fatal_error(".localentry expression must be absolute.");
167 
168  unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res);
169  if (Res != ELF::decodePPC64LocalEntryOffset(Encoded))
170  report_fatal_error(".localentry expression cannot be encoded.");
171 
172  unsigned Other = S->getOther();
173  Other &= ~ELF::STO_PPC64_LOCAL_MASK;
174  Other |= Encoded;
175  S->setOther(Other);
176 
177  // For GAS compatibility, unless we already saw a .abiversion directive,
178  // set e_flags to indicate ELFv2 ABI.
179  unsigned Flags = MCA.getELFHeaderEFlags();
180  if ((Flags & ELF::EF_PPC64_ABI) == 0)
181  MCA.setELFHeaderEFlags(Flags | 2);
182  }
183 
184  void emitAssignment(MCSymbol *S, const MCExpr *Value) override {
185  auto *Symbol = cast<MCSymbolELF>(S);
186 
187  // When encoding an assignment to set symbol A to symbol B, also copy
188  // the st_other bits encoding the local entry point offset.
189  if (copyLocalEntry(Symbol, Value))
190  UpdateOther.insert(Symbol);
191  else
192  UpdateOther.erase(Symbol);
193  }
194 
195  void finish() override {
196  for (auto *Sym : UpdateOther)
197  copyLocalEntry(Sym, Sym->getVariableValue());
198  }
199 
200 private:
201  SmallPtrSet<MCSymbolELF *, 32> UpdateOther;
202 
203  bool copyLocalEntry(MCSymbolELF *D, const MCExpr *S) {
204  auto *Ref = dyn_cast<const MCSymbolRefExpr>(S);
205  if (!Ref)
206  return false;
207  const auto &RhsSym = cast<MCSymbolELF>(Ref->getSymbol());
208  unsigned Other = D->getOther();
209  Other &= ~ELF::STO_PPC64_LOCAL_MASK;
210  Other |= RhsSym.getOther() & ELF::STO_PPC64_LOCAL_MASK;
211  D->setOther(Other);
212  return true;
213  }
214 };
215 
216 class PPCTargetMachOStreamer : public PPCTargetStreamer {
217 public:
218  PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
219 
220  void emitTCEntry(const MCSymbol &S) override {
221  llvm_unreachable("Unknown pseudo-op: .tc");
222  }
223 
224  void emitMachine(StringRef CPU) override {
225  // FIXME: We should update the CPUType, CPUSubType in the Object file if
226  // the new values are different from the defaults.
227  }
228 
229  void emitAbiVersion(int AbiVersion) override {
230  llvm_unreachable("Unknown pseudo-op: .abiversion");
231  }
232 
233  void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
234  llvm_unreachable("Unknown pseudo-op: .localentry");
235  }
236 };
237 
238 } // end anonymous namespace
239 
242  MCInstPrinter *InstPrint,
243  bool isVerboseAsm) {
244  return new PPCTargetAsmStreamer(S, OS);
245 }
246 
247 static MCTargetStreamer *
249  const Triple &TT = STI.getTargetTriple();
250  if (TT.isOSBinFormatELF())
251  return new PPCTargetELFStreamer(S);
252  return new PPCTargetMachOStreamer(S);
253 }
254 
256  unsigned SyntaxVariant,
257  const MCAsmInfo &MAI,
258  const MCInstrInfo &MII,
259  const MCRegisterInfo &MRI) {
260  return new PPCInstPrinter(MAI, MII, MRI, T);
261 }
262 
263 extern "C" void LLVMInitializePowerPCTargetMC() {
264  for (Target *T :
266  // Register the MC asm info.
268 
269  // Register the MC instruction info.
271 
272  // Register the MC register info.
274 
275  // Register the MC subtarget info.
277 
278  // Register the MC Code Emitter
280 
281  // Register the asm backend.
283 
284  // Register the object target streamer.
287 
288  // Register the asm target streamer.
290 
291  // Register the MCInstPrinter.
293  }
294 }
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:480
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:618
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
The access may reference the value stored in memory.
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:870
virtual void finish()
Definition: MCStreamer.cpp:50
ArchType getArch() const
getArch - Get the parsed architecture type of this triple.
Definition: Triple.h:295
virtual void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset)=0
Target & getThePPC64Target()
unsigned getOther() const
void LLVMInitializePowerPCTargetMC()
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:56
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
SmallPtrSet - This class implements a set which is optimized for holding SmallSize or less elements...
Definition: SmallPtrSet.h:417
static void RegisterMCCodeEmitter(Target &T, Target::MCCodeEmitterCtorTy Fn)
RegisterMCCodeEmitter - Register a MCCodeEmitter implementation for the given target.
MCStreamer & Streamer
Definition: MCStreamer.h:85
static GCRegistry::Add< StatepointGC > D("statepoint-example", "an example strategy for statepoint")
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)
LLVM_NODISCARD std::enable_if<!is_simple_type< Y >::value, typename cast_retty< X, const Y >::ret_type >::type dyn_cast(const Y &Val)
Definition: Casting.h:332
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:203
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