[Nios2] Remove Nios2 backend

[craig.topper]

Summary

As mentioned here. This backend is incomplete and has not been maintained in several months. http://lists.llvm.org/pipermail/llvm-dev/2019-January/129121.html

[chandlerc]

LGTM as a patch, but same as the other wait to land until the -dev thread settles.

include/clang/Basic/BuiltinsNios2.def

-//===-- BuiltinsNios2.def - Nios2 Builtin function database --------*- C++ -*-==//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines the Nios2-specific builtin function database. Users of
-// this file must define the BUILTIN macro to make use of this information.
-//
-//===----------------------------------------------------------------------===//
-
-// The format of this database matches clang/Basic/Builtins.def.
-
-#if defined(BUILTIN) && !defined(TARGET_BUILTIN)
-#   define TARGET_BUILTIN(ID, TYPE, ATTRS, FEATURE) BUILTIN(ID, TYPE, ATTRS)
-#endif
-
-// Nios2 R1 builtins:
-
-//int __builtin_ldbio(volatile const void *);
-BUILTIN(__builtin_ldbio, "ivDC*", "")
-//int __builtin_ldbuio(volatile const void *);
-BUILTIN(__builtin_ldbuio, "ivDC*", "")
-//int __builtin_ldhio(volatile const void *);
-BUILTIN(__builtin_ldhio, "ivDC*", "")
-//int __builtin_ldhuio(volatile const void *);
-BUILTIN(__builtin_ldhuio, "ivDC*", "")
-//int __builtin_ldwio(volatile const void *);
-BUILTIN(__builtin_ldwio, "ivDC*", "")
-//int __builtin_ldwuio(int);
-BUILTIN(__builtin_ldwuio, "ii", "")
-// int __builtin_rdctl(int);
-BUILTIN(__builtin_rdctl, "iIi", "")
-// void __builtin_wrctl(int, int);
-BUILTIN(__builtin_wrctl, "vIii", "")
-// int __builtin_rdprs(int, int);
-BUILTIN(__builtin_rdprs, "iii", "")
-//void __builtin_stbio(volatile void *, int);
-BUILTIN(__builtin_stbio, "vvD*i", "")
-//void __builtin_sthio(volatile void *, int);
-BUILTIN(__builtin_sthio, "vvD*i", "")
-//void __builtin_stwio(volatile void *, int);
-BUILTIN(__builtin_stwio, "vvD*i", "")
-//void __builtin_sync(void);
-BUILTIN(__builtin_sync, "v", "")
-// void __builtin_flushd(volatile void *);
-BUILTIN(__builtin_flushd, "vvD*", "")
-// void __builtin_flushda(volatile void *);
-BUILTIN(__builtin_flushda, "vvD*", "")
-
-// Nios2 R2 builtins:
-
-// int __builtin_wrpie(int);
-TARGET_BUILTIN(__builtin_wrpie, "ii", "", "nios2r2mandatory")
-// void __builtin_eni(int);
-TARGET_BUILTIN(__builtin_eni, "vi", "", "nios2r2mandatory")
-// int __builtin_ldex(volatile const void *);
-TARGET_BUILTIN(__builtin_ldex, "ivDC*", "", "nios2r2mandatory")
-// int __builtin_stex(volatile void *, int);
-TARGET_BUILTIN(__builtin_stex, "ivD*i", "", "nios2r2mandatory")
-// int __builtin_ldsex(volatile const void *);
-TARGET_BUILTIN(__builtin_ldsex, "ivDC*", "", "nios2r2mpx")
-// int __builtin_stsex(volatile void *, int);
-TARGET_BUILTIN(__builtin_stsex, "ivDC*i", "", "nios2r2mpx")
-
-#undef BUILTIN
-#undef TARGET_BUILTIN

include/clang/Basic/TargetBuiltins.h

namespace Hexagon {
     enum {
         LastTIBuiltin = clang::Builtin::FirstTSBuiltin-1,
 #define BUILTIN(ID, TYPE, ATTRS) BI##ID,
 #include "clang/Basic/BuiltinsHexagon.def"
         LastTSBuiltin
     };
   }
 
-  /// Nios2 builtins
-  namespace Nios2 {
-  enum {
-    LastTIBuiltin = clang::Builtin::FirstTSBuiltin - 1,
-#define BUILTIN(ID, TYPE, ATTRS) BI##ID,
-#include "clang/Basic/BuiltinsNios2.def"
-    LastTSBuiltin
-  };
-  }
-
   /// MIPS builtins
   namespace Mips {
     enum {
         LastTIBuiltin = clang::Builtin::FirstTSBuiltin-1,
 #define BUILTIN(ID, TYPE, ATTRS) BI##ID,
 #include "clang/Basic/BuiltinsMips.def"
         LastTSBuiltin
     };

include/clang/module.modulemap

module Clang_Basic {
   textual header "Basic/BuiltinsAArch64.def"
   textual header "Basic/BuiltinsAMDGPU.def"
   textual header "Basic/BuiltinsARM.def"
   textual header "Basic/Builtins.def"
   textual header "Basic/BuiltinsHexagon.def"
   textual header "Basic/BuiltinsLe64.def"
   textual header "Basic/BuiltinsMips.def"
   textual header "Basic/BuiltinsNEON.def"
-  textual header "Basic/BuiltinsNios2.def"
   textual header "Basic/BuiltinsNVPTX.def"
   textual header "Basic/BuiltinsPPC.def"
   textual header "Basic/BuiltinsSystemZ.def"
   textual header "Basic/BuiltinsWebAssembly.def"
   textual header "Basic/BuiltinsX86.def"
   textual header "Basic/BuiltinsX86_64.def"
   textual header "Basic/BuiltinsXCore.def"
   textual header "Basic/CodeGenOptions.def"

lib/Basic/CMakeLists.txt

add_clang_library(clangBasic
   Targets/AVR.cpp
   Targets/BPF.cpp
   Targets/Hexagon.cpp
   Targets/Lanai.cpp
   Targets/Le64.cpp
   Targets/MSP430.cpp
   Targets/Mips.cpp
   Targets/NVPTX.cpp
-  Targets/Nios2.cpp
   Targets/OSTargets.cpp
   Targets/PNaCl.cpp
   Targets/PPC.cpp
   Targets/RISCV.cpp
   Targets/SPIR.cpp
   Targets/Sparc.cpp
   Targets/SystemZ.cpp
   Targets/TCE.cpp

lib/Basic/Targets.cpp

 #include "Targets/AVR.h"
 #include "Targets/BPF.h"
 #include "Targets/Hexagon.h"
 #include "Targets/Lanai.h"
 #include "Targets/Le64.h"
 #include "Targets/MSP430.h"
 #include "Targets/Mips.h"
 #include "Targets/NVPTX.h"
-#include "Targets/Nios2.h"
 #include "Targets/OSTargets.h"
 #include "Targets/PNaCl.h"
 #include "Targets/PPC.h"
 #include "Targets/RISCV.h"
 #include "Targets/SPIR.h"
 #include "Targets/Sparc.h"
 #include "Targets/SystemZ.h"
 #include "Targets/TCE.h"
case llvm::Triple::avr:
     return new AVRTargetInfo(Triple, Opts);
   case llvm::Triple::bpfeb:
   case llvm::Triple::bpfel:
     return new BPFTargetInfo(Triple, Opts);
 
   case llvm::Triple::msp430:
     return new MSP430TargetInfo(Triple, Opts);
 
-  case llvm::Triple::nios2:
-    return new LinuxTargetInfo<Nios2TargetInfo>(Triple, Opts);
-
   case llvm::Triple::mips:
     switch (os) {
     case llvm::Triple::Linux:
       return new LinuxTargetInfo<MipsTargetInfo>(Triple, Opts);
     case llvm::Triple::RTEMS:
       return new RTEMSTargetInfo<MipsTargetInfo>(Triple, Opts);
     case llvm::Triple::FreeBSD:
       return new FreeBSDTargetInfo<MipsTargetInfo>(Triple, Opts);

lib/Basic/Targets/Nios2.h

-//===--- Nios2.h - Declare Nios2 target feature support ---------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file declares Nios2 TargetInfo objects.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_NIOS2_H
-#define LLVM_CLANG_LIB_BASIC_TARGETS_NIOS2_H
-
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Basic/TargetOptions.h"
-#include "llvm/ADT/Triple.h"
-#include "llvm/Support/Compiler.h"
-
-namespace clang {
-namespace targets {
-
-class LLVM_LIBRARY_VISIBILITY Nios2TargetInfo : public TargetInfo {
-  void setDataLayout() {
-    if (BigEndian)
-      resetDataLayout("E-p:32:32:32-i8:8:32-i16:16:32-n32");
-    else
-      resetDataLayout("e-p:32:32:32-i8:8:32-i16:16:32-n32");
-  }
-
-  static const Builtin::Info BuiltinInfo[];
-  std::string CPU;
-  std::string ABI;
-
-public:
-  Nios2TargetInfo(const llvm::Triple &triple, const TargetOptions &opts)
-      : TargetInfo(triple), CPU(opts.CPU), ABI(opts.ABI) {
-    SizeType = UnsignedInt;
-    PtrDiffType = SignedInt;
-    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 32;
-    setDataLayout();
-  }
-
-  StringRef getABI() const override { return ABI; }
-  bool setABI(const std::string &Name) override {
-    if (Name == "o32" || Name == "eabi") {
-      ABI = Name;
-      return true;
-    }
-    return false;
-  }
-
-  bool isValidCPUName(StringRef Name) const override {
-    return Name == "nios2r1" || Name == "nios2r2";
-  }
-
-  void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override {
-    Values.append({"nios2r1", "nios2r2"});
-  }
-
-  bool setCPU(const std::string &Name) override {
-    if (isValidCPUName(Name)) {
-      CPU = Name;
-      return true;
-    }
-    return false;
-  }
-
-  void getTargetDefines(const LangOptions &Opts,
-                        MacroBuilder &Builder) const override;
-
-  ArrayRef<Builtin::Info> getTargetBuiltins() const override;
-
-  bool isFeatureSupportedByCPU(StringRef Feature, StringRef CPU) const;
-
-  bool
-  initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags,
-                 StringRef CPU,
-                 const std::vector<std::string> &FeatureVec) const override {
-    static const char *allFeatures[] = {"nios2r2mandatory", "nios2r2bmx",
-                                        "nios2r2mpx", "nios2r2cdx"
-    };
-    for (const char *feature : allFeatures) {
-      Features[feature] = isFeatureSupportedByCPU(feature, CPU);
-    }
-    return true;
-  }
-
-  bool hasFeature(StringRef Feature) const override {
-    return isFeatureSupportedByCPU(Feature, CPU);
-  }
-
-  BuiltinVaListKind getBuiltinVaListKind() const override {
-    return TargetInfo::VoidPtrBuiltinVaList;
-  }
-
-  ArrayRef<const char *> getGCCRegNames() const override {
-    static const char *const GCCRegNames[] = {
-        // CPU register names
-        // Must match second column of GCCRegAliases
-        "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
-        "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20",
-        "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", "r30",
-        "r31",
-        // Floating point register names
-        "ctl0", "ctl1", "ctl2", "ctl3", "ctl4", "ctl5", "ctl6", "ctl7", "ctl8",
-        "ctl9", "ctl10", "ctl11", "ctl12", "ctl13", "ctl14", "ctl15"
-    };
-    return llvm::makeArrayRef(GCCRegNames);
-  }
-
-  bool validateAsmConstraint(const char *&Name,
-                             TargetInfo::ConstraintInfo &Info) const override {
-    switch (*Name) {
-    default:
-      return false;
-
-    case 'r': // CPU registers.
-    case 'd': // Equivalent to "r" unless generating MIPS16 code.
-    case 'y': // Equivalent to "r", backwards compatibility only.
-    case 'f': // floating-point registers.
-    case 'c': // $25 for indirect jumps
-    case 'l': // lo register
-    case 'x': // hilo register pair
-      Info.setAllowsRegister();
-      return true;
-    }
-  }
-
-  const char *getClobbers() const override { return ""; }
-
-  ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
-    static const TargetInfo::GCCRegAlias aliases[] = {
-        {{"zero"}, "r0"},      {{"at"}, "r1"},          {{"et"}, "r24"},
-        {{"bt"}, "r25"},       {{"gp"}, "r26"},         {{"sp"}, "r27"},
-        {{"fp"}, "r28"},       {{"ea"}, "r29"},         {{"ba"}, "r30"},
-        {{"ra"}, "r31"},       {{"status"}, "ctl0"},    {{"estatus"}, "ctl1"},
-        {{"bstatus"}, "ctl2"}, {{"ienable"}, "ctl3"},   {{"ipending"}, "ctl4"},
-        {{"cpuid"}, "ctl5"},   {{"exception"}, "ctl7"}, {{"pteaddr"}, "ctl8"},
-        {{"tlbacc"}, "ctl9"},  {{"tlbmisc"}, "ctl10"},  {{"badaddr"}, "ctl12"},
-        {{"config"}, "ctl13"}, {{"mpubase"}, "ctl14"},  {{"mpuacc"}, "ctl15"},
-    };
-    return llvm::makeArrayRef(aliases);
-  }
-};
-
-} // namespace targets
-} // namespace clang
-#endif // LLVM_CLANG_LIB_BASIC_TARGETS_NIOS2_H

lib/Basic/Targets/Nios2.cpp

-//===--- Nios2.cpp - Implement Nios2 target feature support ---------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements Nios2 TargetInfo objects.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Nios2.h"
-#include "Targets.h"
-#include "clang/Basic/MacroBuilder.h"
-#include "clang/Basic/TargetBuiltins.h"
-#include "llvm/ADT/StringSwitch.h"
-
-using namespace clang;
-using namespace clang::targets;
-
-const Builtin::Info Nios2TargetInfo::BuiltinInfo[] = {
-#define BUILTIN(ID, TYPE, ATTRS)                                               \
-  {#ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, nullptr},
-#define TARGET_BUILTIN(ID, TYPE, ATTRS, FEATURE)                               \
-  {#ID, TYPE, ATTRS, nullptr, ALL_LANGUAGES, FEATURE},
-#include "clang/Basic/BuiltinsNios2.def"
-};
-
-bool Nios2TargetInfo::isFeatureSupportedByCPU(StringRef Feature,
-                                              StringRef CPU) const {
-  const bool isR2 = CPU == "nios2r2";
-  return llvm::StringSwitch<bool>(Feature)
-      .Case("nios2r2mandatory", isR2)
-      .Case("nios2r2bmx", isR2)
-      .Case("nios2r2mpx", isR2)
-      .Case("nios2r2cdx", isR2)
-      .Default(false);
-}
-
-void Nios2TargetInfo::getTargetDefines(const LangOptions &Opts,
-                                       MacroBuilder &Builder) const {
-  DefineStd(Builder, "nios2", Opts);
-  DefineStd(Builder, "NIOS2", Opts);
-
-  Builder.defineMacro("__nios2");
-  Builder.defineMacro("__NIOS2");
-  Builder.defineMacro("__nios2__");
-  Builder.defineMacro("__NIOS2__");
-}
-
-ArrayRef<Builtin::Info> Nios2TargetInfo::getTargetBuiltins() const {
-  return llvm::makeArrayRef(BuiltinInfo, clang::Nios2::LastTSBuiltin -
-                                             Builtin::FirstTSBuiltin);
-}

lib/Driver/ToolChains/CommonArgs.cpp

return llvm::StringSwitch<const char *>(GPUName)
         .Cases("sumo", "sumo2", "sumo")
         .Case("hemlock", "cypress")
         .Case("aruba", "cayman")
         .Default(GPUName);
   }
   return "";
 }
 
-static std::string getNios2TargetCPU(const ArgList &Args) {
-  Arg *A = Args.getLastArg(options::OPT_mcpu_EQ);
-  if (!A)
-    A = Args.getLastArg(options::OPT_march_EQ);
-
-  if (!A)
-    return "";
-
-  const char *name = A->getValue();
-  return llvm::StringSwitch<const char *>(name)
-      .Case("r1", "nios2r1")
-      .Case("r2", "nios2r2")
-      .Default(name);
-}
-
 static std::string getLanaiTargetCPU(const ArgList &Args) {
   if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
     return A->getValue();
   }
   return "";
 }
 
 /// Get the (LLVM) name of the WebAssembly cpu we are targeting.
case llvm::Triple::thumbeb: {
     return arm::getARMTargetCPU(MCPU, MArch, T);
   }
 
   case llvm::Triple::avr:
     if (const Arg *A = Args.getLastArg(options::OPT_mmcu_EQ))
       return A->getValue();
     return "";
 
-  case llvm::Triple::nios2: {
-    return getNios2TargetCPU(Args);
-  }
-
   case llvm::Triple::mips:
   case llvm::Triple::mipsel:
   case llvm::Triple::mips64:
   case llvm::Triple::mips64el: {
     StringRef CPUName;
     StringRef ABIName;
     mips::getMipsCPUAndABI(Args, T, CPUName, ABIName);
     return CPUName;

test/Driver/nios2-cpu.c

-// RUN: %clang -target nios2--- %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck %s
-
-// RUN: %clang -target nios2--- -mcpu=r1 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R1 %s
-// RUN: %clang -target nios2--- -mcpu=nios2r1 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R1 %s
-// RUN: %clang -target nios2--- -march=r1 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R1 %s
-// RUN: %clang -target nios2--- -march=nios2r1 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R1 %s
-
-// RUN: %clang -target nios2--- -mcpu=r2 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R2 %s
-// RUN: %clang -target nios2--- -mcpu=nios2r2 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R2 %s
-// RUN: %clang -target nios2--- -march=r2 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R2 %s
-// RUN: %clang -target nios2--- -march=nios2r2 %s -### -o %t.o 2>&1 \
-// RUN:   | FileCheck -check-prefix=CHECK-R2 %s
-
-// CHECK: "-triple" "nios2-unknown-unknown-unknown"
-// CHECK-R1: "-triple" "nios2-unknown-unknown-unknown"
-// CHECK-R1: "-target-cpu" "nios2r1"
-// CHECK-R2: "-triple" "nios2-unknown-unknown-unknown"
-// CHECK-R2: "-target-cpu" "nios2r2"

test/Misc/target-invalid-cpu-note.c

 // PPC: error: unknown target CPU 'not-a-cpu'
 // PPC: note: valid target CPU values are: generic, 440, 450, 601, 602, 603,
 // PPC-SAME: 603e, 603ev, 604, 604e, 620, 630, g3, 7400, g4, 7450, g4+, 750,
 // PPC-SAME: 970, g5, a2, a2q, e500mc, e5500, power3, pwr3, power4, pwr4,
 // PPC-SAME: power5, pwr5, power5x, pwr5x, power6, pwr6, power6x, pwr6x, power7,
 // PPC-SAME: pwr7, power8, pwr8, power9, pwr9, powerpc, ppc, powerpc64, ppc64,
 // PPC-SAME: powerpc64le, ppc64le
 
-// RUN: not %clang_cc1 -triple nios2--- -target-cpu not-a-cpu -fsyntax-only %s 2>&1 | FileCheck %s --check-prefix NIOS
-// NIOS: error: unknown target CPU 'not-a-cpu'
-// NIOS: note: valid target CPU values are: nios2r1, nios2r2
-
 // RUN: not %clang_cc1 -triple mips--- -target-cpu not-a-cpu -fsyntax-only %s 2>&1 | FileCheck %s --check-prefix MIPS
 // MIPS: error: unknown target CPU 'not-a-cpu'
 // MIPS: note: valid target CPU values are: mips1, mips2, mips3, mips4, mips5,
 // MIPS-SAME: mips32, mips32r2, mips32r3, mips32r5, mips32r6, mips64, mips64r2,
 // MIPS-SAME: mips64r3, mips64r5, mips64r6, octeon, p5600
 
 // RUN: not %clang_cc1 -triple lanai--- -target-cpu not-a-cpu -fsyntax-only %s 2>&1 | FileCheck %s --check-prefix LANAI
 // LANAI: error: unknown target CPU 'not-a-cpu'