implement the null function for the Mips32 subzero compiler

src/IceTargetLoweringMIPS32.cpp

 //===- subzero/src/IceTargetLoweringMIPS32.cpp - MIPS32 lowering ----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 13 matching lines @@
 #include "IceInstMIPS32.h"
 #include "IceLiveness.h"
 #include "IceOperand.h"
 #include "IceRegistersMIPS32.h"
 #include "IceTargetLoweringMIPS32.def"
 #include "IceUtils.h"
 #include "llvm/Support/MathExtras.h"
 
 namespace Ice {
 
+namespace {
+void UnimplementedError(const ClFlags &Flags) {
+  if (!Flags.getSkipUnimplemented()) {
+    // Use llvm_unreachable instead of report_fatal_error, which gives better
+    // stack traces.
+    llvm_unreachable("Not yet implemented");
+    abort();
+  }
+}
+} // end of anonymous namespace
+
 TargetMIPS32::TargetMIPS32(Cfg *Func) : TargetLowering(Func) {
   // TODO: Don't initialize IntegerRegisters and friends every time.
   // Instead, initialize in some sort of static initializer for the
   // class.
   llvm::SmallBitVector IntegerRegisters(RegMIPS32::Reg_NUM);
   llvm::SmallBitVector FloatRegisters(RegMIPS32::Reg_NUM);
   llvm::SmallBitVector VectorRegisters(RegMIPS32::Reg_NUM);
   llvm::SmallBitVector InvalidRegisters(RegMIPS32::Reg_NUM);
   ScratchRegs.resize(RegMIPS32::Reg_NUM);
 #define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
@@ skipping 154 matching lines @@
 
   // Nop insertion
   if (Ctx->getFlags().shouldDoNopInsertion()) {
     Func->doNopInsertion();
   }
 }
 
 bool TargetMIPS32::doBranchOpt(Inst *I, const CfgNode *NextNode) {
   (void)I;
   (void)NextNode;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
+  return false;
 }
 
 IceString TargetMIPS32::RegNames[] = {
 #define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
           isFP)                                                                \
   name,
     REGMIPS32_TABLE
 #undef X
 };
 
@@ skipping 21 matching lines @@
       Reg->setIgnoreLiveness();
     }
   }
   return Reg;
 }
 
 void TargetMIPS32::emitVariable(const Variable *Var) const {
   Ostream &Str = Ctx->getStrEmit();
   (void)Var;
   (void)Str;
-  llvm::report_fatal_error("emitVariable: Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerArguments() {
-  llvm::report_fatal_error("lowerArguments: Not yet implemented");
+  VarList &Args = Func->getArgs();
+  if (Args.size() > 0)
+    UnimplementedError(Func->getContext()->getFlags());
 }
 
 Type TargetMIPS32::stackSlotType() { return IceType_i32; }
 
 void TargetMIPS32::addProlog(CfgNode *Node) {
   (void)Node;
-  llvm::report_fatal_error("addProlog: Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::addEpilog(CfgNode *Node) {
   (void)Node;
-  llvm::report_fatal_error("addEpilog: Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 llvm::SmallBitVector TargetMIPS32::getRegisterSet(RegSetMask Include,
                                                   RegSetMask Exclude) const {
   llvm::SmallBitVector Registers(RegMIPS32::Reg_NUM);
 
 #define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
           isFP)                                                                \
   if (scratch && (Include & RegSet_CallerSave))                                \
     Registers[RegMIPS32::val] = true;                                          \
@@ skipping 21 matching lines @@
 
 void TargetMIPS32::lowerAlloca(const InstAlloca *Inst) {
   UsesFramePointer = true;
   // Conservatively require the stack to be aligned.  Some stack
   // adjustment operations implemented below assume that the stack is
   // aligned before the alloca.  All the alloca code ensures that the
   // stack alignment is preserved after the alloca.  The stack alignment
   // restriction can be relaxed in some cases.
   NeedsStackAlignment = true;
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerArithmetic(const InstArithmetic *Inst) {
   switch (Inst->getOp()) {
   case InstArithmetic::_num:
-    llvm_unreachable("Unknown arithmetic operator");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Add:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::And:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Or:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Xor:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Sub:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Mul:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Shl:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Lshr:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Ashr:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Udiv:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Sdiv:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Urem:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Srem:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Fadd:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Fsub:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Fmul:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Fdiv:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstArithmetic::Frem:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   }
 }
 
 void TargetMIPS32::lowerAssign(const InstAssign *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerBr(const InstBr *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerCall(const InstCall *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerCast(const InstCast *Inst) {
   InstCast::OpKind CastKind = Inst->getCastKind();
   switch (CastKind) {
   default:
     Func->setError("Cast type not supported");
     return;
   case InstCast::Sext: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   }
   case InstCast::Zext: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   }
   case InstCast::Trunc: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   }
   case InstCast::Fptrunc:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstCast::Fpext: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   }
   case InstCast::Fptosi:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstCast::Fptoui:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstCast::Sitofp:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   case InstCast::Uitofp: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   }
   case InstCast::Bitcast: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     break;
   }
   }
 }
 
 void TargetMIPS32::lowerExtractElement(const InstExtractElement *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerFcmp(const InstFcmp *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerIcmp(const InstIcmp *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerInsertElement(const InstInsertElement *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerIntrinsicCall(const InstIntrinsicCall *Instr) {
   switch (Intrinsics::IntrinsicID ID = Instr->getIntrinsicInfo().ID) {
   case Intrinsics::AtomicCmpxchg: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::AtomicFence:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   case Intrinsics::AtomicFenceAll:
     // NOTE: FenceAll should prevent and load/store from being moved
     // across the fence (both atomic and non-atomic). The InstMIPS32Mfence
     // instruction is currently marked coarsely as "HasSideEffects".
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   case Intrinsics::AtomicIsLockFree: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::AtomicLoad: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::AtomicRMW:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   case Intrinsics::AtomicStore: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Bswap: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Ctpop: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Ctlz: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Cttz: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Fabs: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Longjmp: {
     InstCall *Call = makeHelperCall(H_call_longjmp, nullptr, 2);
     Call->addArg(Instr->getArg(0));
     Call->addArg(Instr->getArg(1));
     lowerCall(Call);
     return;
   }
   case Intrinsics::Memcpy: {
@@ skipping 24 matching lines @@
     lowerCast(InstCast::create(Func, InstCast::Zext, ValExt, ValOp));
     InstCall *Call = makeHelperCall(H_call_memset, nullptr, 3);
     Call->addArg(Instr->getArg(0));
     Call->addArg(ValExt);
     Call->addArg(Instr->getArg(2));
     lowerCall(Call);
     return;
   }
   case Intrinsics::NaClReadTP: {
     if (Ctx->getFlags().getUseSandboxing()) {
-      llvm::report_fatal_error("Not yet implemented");
+      UnimplementedError(Func->getContext()->getFlags());
     } else {
       InstCall *Call = makeHelperCall(H_call_read_tp, Instr->getDest(), 0);
       lowerCall(Call);
     }
     return;
   }
   case Intrinsics::Setjmp: {
     InstCall *Call = makeHelperCall(H_call_setjmp, Instr->getDest(), 1);
     Call->addArg(Instr->getArg(0));
     lowerCall(Call);
     return;
   }
   case Intrinsics::Sqrt: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Stacksave: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Stackrestore: {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   }
   case Intrinsics::Trap:
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
     return;
   case Intrinsics::UnknownIntrinsic:
     Func->setError("Should not be lowering UnknownIntrinsic");
     return;
   }
   return;
 }
 
 void TargetMIPS32::lowerLoad(const InstLoad *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::doAddressOptLoad() {
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::randomlyInsertNop(float Probability) {
   RandomNumberGeneratorWrapper RNG(Ctx->getRNG());
   if (RNG.getTrueWithProbability(Probability)) {
-    llvm::report_fatal_error("Not yet implemented");
+    UnimplementedError(Func->getContext()->getFlags());
   }
 }
 
 void TargetMIPS32::lowerPhi(const InstPhi * /*Inst*/) {
   Func->setError("Phi found in regular instruction list");
 }
 
 void TargetMIPS32::lowerRet(const InstRet *Inst) {
-  (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  Variable *Reg = nullptr;
+  if (Inst->hasRetValue())
+    UnimplementedError(Func->getContext()->getFlags());
+  _ret(getPhysicalRegister(RegMIPS32::Reg_RA), Reg);
 }
 
 void TargetMIPS32::lowerSelect(const InstSelect *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerStore(const InstStore *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::doAddressOptStore() {
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerSwitch(const InstSwitch *Inst) {
   (void)Inst;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::lowerUnreachable(const InstUnreachable * /*Inst*/) {
-  llvm_unreachable("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 // Turn an i64 Phi instruction into a pair of i32 Phi instructions, to
 // preserve integrity of liveness analysis.  Undef values are also
 // turned into zeroes, since loOperand() and hiOperand() don't expect
 // Undef input.
 void TargetMIPS32::prelowerPhis() {
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 // Lower the pre-ordered list of assignments into mov instructions.
 // Also has to do some ad-hoc register allocation as necessary.
 void TargetMIPS32::lowerPhiAssignments(CfgNode *Node,
                                        const AssignList &Assignments) {
   (void)Node;
   (void)Assignments;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::postLower() {
   if (Ctx->getFlags().getOptLevel() == Opt_m1)
     return;
   // Find two-address non-SSA instructions where Dest==Src0, and set
   // the DestNonKillable flag to keep liveness analysis consistent.
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 void TargetMIPS32::makeRandomRegisterPermutation(
     llvm::SmallVectorImpl<int32_t> &Permutation,
     const llvm::SmallBitVector &ExcludeRegisters) const {
   (void)Permutation;
   (void)ExcludeRegisters;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Func->getContext()->getFlags());
 }
 
 /* TODO(jvoung): avoid duplicate symbols with multiple targets.
 void ConstantUndef::emitWithoutDollar(GlobalContext *) const {
   llvm_unreachable("Not expecting to emitWithoutDollar undef");
 }
 
 void ConstantUndef::emit(GlobalContext *) const {
   llvm_unreachable("undef value encountered by emitter.");
 }
@@ skipping 18 matching lines @@
         emitGlobal(*Var, SectionSuffix);
       }
     }
   } break;
   }
 }
 
 void TargetDataMIPS32::lowerConstants() {
   if (Ctx->getFlags().getDisableTranslation())
     return;
-  llvm::report_fatal_error("Not yet implemented");
+  UnimplementedError(Ctx->getFlags());
 }
 
 TargetHeaderMIPS32::TargetHeaderMIPS32(GlobalContext *Ctx)
     : TargetHeaderLowering(Ctx) {}
 
 } // end of namespace Ice