Convert assert(0) to llvm_unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149814 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/CellSPU/MCTargetDesc/SPUMCTargetDesc.cpp b/lib/Target/CellSPU/MCTargetDesc/SPUMCTargetDesc.cpp
index 5ce14c99cd1e388c5ec51c1d849f57d57aa996d3..0d36498fdadb7c37a05f797f0c0d6bbee8f84dc9 100644 (file)
--- a/lib/Target/CellSPU/MCTargetDesc/SPUMCTargetDesc.cpp
+++ b/lib/Target/CellSPU/MCTargetDesc/SPUMCTargetDesc.cpp
@@ -18,6 +18,7 @@
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 
 #define GET_INSTRINFO_MC_DESC

diff --git a/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp b/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp
index 625f07ccd1359e830ce7f2e59cf168854866cf1c..39633698a2595117cf6e5cc1f0f3f37b676c73d8 100644 (file)
--- a/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp
+++ b/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp
@@ -18,6 +18,7 @@
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 
 #define GET_INSTRINFO_MC_DESC

diff --git a/lib/Target/MBlaze/MBlazeIntrinsicInfo.cpp b/lib/Target/MBlaze/MBlazeIntrinsicInfo.cpp
index 4c78deb8fd6c1fe298995287080fcc32eb2c9731..e10126fe2286b6107942660b69715f5b41503c23 100644 (file)
--- a/lib/Target/MBlaze/MBlazeIntrinsicInfo.cpp
+++ b/lib/Target/MBlaze/MBlazeIntrinsicInfo.cpp
@@ -18,6 +18,7 @@
 #include "llvm/Module.h"
 #include "llvm/Type.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/ErrorHandling.h"
 #include <cstring>
 
 using namespace llvm;

diff --git a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
index 154ca17ba0ff397502ee264cea76715434971d8a..a0679a82356f541793606a7309dd3285236351f8 100644 (file)
--- a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
@@ -20,6 +20,7 @@
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 
 #define GET_INSTRINFO_MC_DESC

diff --git a/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp b/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
index 7c47051195532cf7324146482c77cbde36bb7ce1..831a5276d19c86ddfadc9ef37c0ef339989c5fa6 100644 (file)
--- a/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
+++ b/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
@@ -20,6 +20,7 @@
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 
 #define GET_INSTRINFO_MC_DESC

diff --git a/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp b/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp
index eda04c35083aabd851c198ea8f7f824471d8ce2b..56c86abf0f2acd18f75bc493c9fac91e1cb103ce 100644 (file)
--- a/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp
+++ b/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp
@@ -17,6 +17,7 @@
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 
 #define GET_INSTRINFO_MC_DESC

diff --git a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
index 4db1e2f45f8f4722861c54c291f943ce791efb39..68259e37504cc8c1958520c06fd7f58298b4cd60 100644 (file)
--- a/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -24,6 +24,7 @@
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Support/Host.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 
 #define GET_REGINFO_MC_DESC

diff --git a/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp b/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp
index 7d5fcce84ca92d7c707efed3e3ee19cfb6a63768..a795dea433e8dbd5fb42f5b3948729d38b175531 100644 (file)
--- a/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp
+++ b/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp
@@ -17,6 +17,7 @@
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
 
 #define GET_INSTRINFO_MC_DESC

diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index 48421f2fdeba1ee9ad4a225eb93e5bb0e7559062..80467ff3dc7e19b634398a65966809eb200fa548 100644 (file)
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -107,6 +107,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/TableGen/Error.h"
 #include "llvm/TableGen/Record.h"
 #include <map>
@@ -251,7 +252,7 @@ public:
 
     switch (Kind) {
     case Invalid:
-      assert(0 && "Invalid kind!");
+      llvm_unreachable("Invalid kind!");
 
     default:
       // This class precedes the RHS if it is a proper subset of the RHS.

diff --git a/utils/TableGen/AsmWriterEmitter.cpp b/utils/TableGen/AsmWriterEmitter.cpp
index 2c21965a034219238c4188ea8cd380d39acea356..c4812dcae6d5cf4ca55d9a3b27ab8d1c8fcc988e 100644 (file)
--- a/utils/TableGen/AsmWriterEmitter.cpp
+++ b/utils/TableGen/AsmWriterEmitter.cpp
@@ -544,7 +544,7 @@ void AsmWriterEmitter::EmitGetRegisterName(raw_ostream &O) {
     O << "  const unsigned *RegAsmOffset;\n"
       << "  const char *AsmStrs;\n"
       << "  switch(AltIdx) {\n"
-      << "  default: assert(0 && \"Invalid register alt name index!\");\n";
+      << "  default: llvm_unreachable(\"Invalid register alt name index!\");\n";
     for (unsigned i = 0, e = AltNameIndices.size(); i < e; ++i) {
       StringRef Namespace = AltNameIndices[1]->getValueAsString("Namespace");
       StringRef AltName(AltNameIndices[i]->getName());

diff --git a/utils/TableGen/CodeGenDAGPatterns.cpp b/utils/TableGen/CodeGenDAGPatterns.cpp
index 5087935d91d691a468e6b1048bbc04b4e7c1cdd1..3280e09274f6bf3f998153090710bd89df849557 100644 (file)
--- a/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -749,7 +749,7 @@ std::string PatternToMatch::getPredicateCheck() const {
 #ifndef NDEBUG
         Def->dump();
 #endif
-        assert(0 && "Unknown predicate type!");
+        llvm_unreachable("Unknown predicate type!");
       }
       if (!PredicateCheck.empty())
         PredicateCheck += " && ";
@@ -1609,10 +1609,9 @@ bool TreePatternNode::ApplyTypeConstraints(TreePattern &TP, bool NotRegisters) {
         MadeChange |= Child->UpdateNodeType(ChildResNo, MVT::iPTR, TP);
       } else if (OperandNode->getName() == "unknown") {
         // Nothing to do.
-      } else {
-        assert(0 && "Unknown operand type!");
-        abort();
-      }
+      } else
+        llvm_unreachable("Unknown operand type!");
+
       MadeChange |= Child->ApplyTypeConstraints(TP, NotRegisters);
     }
 

diff --git a/utils/TableGen/CodeGenDAGPatterns.h b/utils/TableGen/CodeGenDAGPatterns.h
index 936fd0146455e77e6bc60c1790c8fb4e86e44a00..5a2d40aa7c8608b387702433b10227c84ff710b3 100644 (file)
--- a/utils/TableGen/CodeGenDAGPatterns.h
+++ b/utils/TableGen/CodeGenDAGPatterns.h
@@ -19,6 +19,7 @@
 #include "CodeGenIntrinsics.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
+#include "llvm/Support/ErrorHandling.h"
 #include <set>
 #include <algorithm>
 #include <vector>
@@ -723,8 +724,7 @@ public:
       if (Intrinsics[i].TheDef == R) return Intrinsics[i];
     for (unsigned i = 0, e = TgtIntrinsics.size(); i != e; ++i)
       if (TgtIntrinsics[i].TheDef == R) return TgtIntrinsics[i];
-    assert(0 && "Unknown intrinsic!");
-    abort();
+    llvm_unreachable("Unknown intrinsic!");
   }
 
   const CodeGenIntrinsic &getIntrinsicInfo(unsigned IID) const {
@@ -732,8 +732,7 @@ public:
       return Intrinsics[IID-1];
     if (IID-Intrinsics.size()-1 < TgtIntrinsics.size())
       return TgtIntrinsics[IID-Intrinsics.size()-1];
-    assert(0 && "Bad intrinsic ID!");
-    abort();
+    llvm_unreachable("Bad intrinsic ID!");
   }
 
   unsigned getIntrinsicID(Record *R) const {
@@ -741,8 +740,7 @@ public:
       if (Intrinsics[i].TheDef == R) return i;
     for (unsigned i = 0, e = TgtIntrinsics.size(); i != e; ++i)
       if (TgtIntrinsics[i].TheDef == R) return i + Intrinsics.size();
-    assert(0 && "Unknown intrinsic!");
-    abort();
+    llvm_unreachable("Unknown intrinsic!");
   }
 
   const DAGDefaultOperand &getDefaultOperand(Record *R) const {

diff --git a/utils/TableGen/CodeGenRegisters.h b/utils/TableGen/CodeGenRegisters.h
index 5fc0f657392573a48923dc77ddfbb0fb5b712cce..beaa67830e914a4b9ec2b8209961def19717cddd 100644 (file)
--- a/utils/TableGen/CodeGenRegisters.h
+++ b/utils/TableGen/CodeGenRegisters.h
@@ -22,6 +22,7 @@
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SetVector.h"
+#include "llvm/Support/ErrorHandling.h"
 #include <cstdlib>
 #include <map>
 #include <string>
@@ -192,8 +193,7 @@ namespace llvm {
     MVT::SimpleValueType getValueTypeNum(unsigned VTNum) const {
       if (VTNum < VTs.size())
         return VTs[VTNum];
-      assert(0 && "VTNum greater than number of ValueTypes in RegClass!");
-      abort();
+      llvm_unreachable("VTNum greater than number of ValueTypes in RegClass!");
     }
 
     // Return true if this this class contains the register.

diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index 3c97e14e01281fa4c06334b731b4281d5e8569c7..cf6793570a2633529a072fe29c4fd19ce28cb996 100644 (file)
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -93,7 +93,7 @@ std::string llvm::getEnumName(MVT::SimpleValueType T) {
   case MVT::iPTR:     return "MVT::iPTR";
   case MVT::iPTRAny:  return "MVT::iPTRAny";
   case MVT::Untyped:  return "MVT::Untyped";
-  default: assert(0 && "ILLEGAL VALUE TYPE!"); return "";
+  default: llvm_unreachable("ILLEGAL VALUE TYPE!");
   }
 }
 
@@ -515,7 +515,7 @@ CodeGenIntrinsic::CodeGenIntrinsic(Record *R) {
       unsigned ArgNo = Property->getValueAsInt("ArgNo");
       ArgumentAttributes.push_back(std::make_pair(ArgNo, NoCapture));
     } else
-      assert(0 && "Unknown property!");
+      llvm_unreachable("Unknown property!");
   }
 
   // Sort the argument attributes for later benefit.

diff --git a/utils/TableGen/DAGISelMatcherEmitter.cpp b/utils/TableGen/DAGISelMatcherEmitter.cpp
index 3b65b2a6de0cbc675efe9cca3bd538d4209a2e80..bd425a9bc1a9c49a7a6719367f36a737f4b85446 100644 (file)
--- a/utils/TableGen/DAGISelMatcherEmitter.cpp
+++ b/utils/TableGen/DAGISelMatcherEmitter.cpp
@@ -573,8 +573,7 @@ EmitMatcher(const Matcher *N, unsigned Indent, unsigned CurrentIdx,
     return 2 + NumResultBytes;
   }
   }
-  assert(0 && "Unreachable");
-  return 0;
+  llvm_unreachable("Unreachable");
 }
 
 /// EmitMatcherList - Emit the bytes for the specified matcher subtree.
@@ -601,7 +600,7 @@ void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
   if (!PatternPredicates.empty()) {
     OS << "bool CheckPatternPredicate(unsigned PredNo) const {\n";
     OS << "  switch (PredNo) {\n";
-    OS << "  default: assert(0 && \"Invalid predicate in table?\");\n";
+    OS << "  default: llvm_unreachable(\"Invalid predicate in table?\");\n";
     for (unsigned i = 0, e = PatternPredicates.size(); i != e; ++i)
       OS << "  case " << i << ": return "  << PatternPredicates[i] << ";\n";
     OS << "  }\n";
@@ -619,7 +618,7 @@ void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
   if (!NodePredicates.empty()) {
     OS << "bool CheckNodePredicate(SDNode *Node, unsigned PredNo) const {\n";
     OS << "  switch (PredNo) {\n";
-    OS << "  default: assert(0 && \"Invalid predicate in table?\");\n";
+    OS << "  default: llvm_unreachable(\"Invalid predicate in table?\");\n";
     for (unsigned i = 0, e = NodePredicates.size(); i != e; ++i) {
       // Emit the predicate code corresponding to this pattern.
       TreePredicateFn PredFn = NodePredicates[i];
@@ -641,7 +640,7 @@ void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
     OS << "         SmallVectorImpl<std::pair<SDValue, SDNode*> > &Result) {\n";
     OS << "  unsigned NextRes = Result.size();\n";
     OS << "  switch (PatternNo) {\n";
-    OS << "  default: assert(0 && \"Invalid pattern # in table?\");\n";
+    OS << "  default: llvm_unreachable(\"Invalid pattern # in table?\");\n";
     for (unsigned i = 0, e = ComplexPatterns.size(); i != e; ++i) {
       const ComplexPattern &P = *ComplexPatterns[i];
       unsigned NumOps = P.getNumOperands();
@@ -679,7 +678,7 @@ void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
   if (!NodeXForms.empty()) {
     OS << "SDValue RunSDNodeXForm(SDValue V, unsigned XFormNo) {\n";
     OS << "  switch (XFormNo) {\n";
-    OS << "  default: assert(0 && \"Invalid xform # in table?\");\n";
+    OS << "  default: llvm_unreachable(\"Invalid xform # in table?\");\n";
 
     // FIXME: The node xform could take SDValue's instead of SDNode*'s.
     for (unsigned i = 0, e = NodeXForms.size(); i != e; ++i) {

diff --git a/utils/TableGen/FixedLenDecoderEmitter.cpp b/utils/TableGen/FixedLenDecoderEmitter.cpp
index 440d44c542a355b17bf82904e38cb28232ae4688..c0a0a80f1da578e08ce8cbff4e4e57cc8a6f1041 100644 (file)
--- a/utils/TableGen/FixedLenDecoderEmitter.cpp
+++ b/utils/TableGen/FixedLenDecoderEmitter.cpp
@@ -71,7 +71,7 @@ static void dumpBits(raw_ostream &o, BitsInit &bits) {
       o << "_";
       break;
     default:
-      assert(0 && "unexpected return value from bitFromBits");
+      llvm_unreachable("unexpected return value from bitFromBits");
     }
   }
 }
@@ -698,9 +698,7 @@ unsigned FilterChooser::getIslands(std::vector<unsigned> &StartBits,
     Val = Value(Insn[i]);
     bool Filtered = PositionFiltered(i);
     switch (State) {
-    default:
-      assert(0 && "Unreachable code!");
-      break;
+    default: llvm_unreachable("Unreachable code!");
     case 0:
     case 1:
       if (Filtered || Val == -1)
@@ -1069,7 +1067,7 @@ bool FilterChooser::filterProcessor(bool AllowMixed, bool Greedy) {
         RA = ATTR_MIXED;
         break;
       default:
-        assert(0 && "Unexpected bitAttr!");
+        llvm_unreachable("Unexpected bitAttr!");
       }
       break;
     case ATTR_ALL_SET:
@@ -1090,7 +1088,7 @@ bool FilterChooser::filterProcessor(bool AllowMixed, bool Greedy) {
         RA = ATTR_MIXED;
         break;
       default:
-        assert(0 && "Unexpected bitAttr!");
+        llvm_unreachable("Unexpected bitAttr!");
       }
       break;
     case ATTR_MIXED:
@@ -1112,13 +1110,13 @@ bool FilterChooser::filterProcessor(bool AllowMixed, bool Greedy) {
       case ATTR_MIXED:
         break;
       default:
-        assert(0 && "Unexpected bitAttr!");
+        llvm_unreachable("Unexpected bitAttr!");
       }
       break;
     case ATTR_ALL_UNSET:
-      assert(0 && "regionAttr state machine has no ATTR_UNSET state");
+      llvm_unreachable("regionAttr state machine has no ATTR_UNSET state");
     case ATTR_FILTERED:
-      assert(0 && "regionAttr state machine has no ATTR_FILTERED state");
+      llvm_unreachable("regionAttr state machine has no ATTR_FILTERED state");
     }
   }
 

diff --git a/utils/TableGen/IntrinsicEmitter.cpp b/utils/TableGen/IntrinsicEmitter.cpp
index 657988b3f82372d8d3998d2fba256dd62164955d..228d9297072d619099bf73891c9c2ea4c2a8012c 100644 (file)
--- a/utils/TableGen/IntrinsicEmitter.cpp
+++ b/utils/TableGen/IntrinsicEmitter.cpp
@@ -320,7 +320,7 @@ void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
   OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
   OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
   OS << "  switch (ID) {\n";
-  OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
+  OS << "  default: llvm_unreachable(\"Invalid intrinsic!\");\n";
   
   // This checking can emit a lot of very common code.  To reduce the amount of
   // code that we emit, batch up cases that have identical types.  This avoids
@@ -416,7 +416,7 @@ void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
   OS << "// Code for generating Intrinsic function declarations.\n";
   OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
   OS << "  switch (id) {\n";
-  OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
+  OS << "  default: llvm_unreachable(\"Invalid intrinsic!\");\n";
   
   // Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
   // types.
@@ -485,8 +485,7 @@ namespace {
     case CodeGenIntrinsic::ReadWriteMem:
       return MRK_none;
     }
-    assert(0 && "bad mod-ref kind");
-    return MRK_none;
+    llvm_unreachable("bad mod-ref kind");
   }
 
   struct AttributeComparator {

diff --git a/utils/TableGen/PseudoLoweringEmitter.cpp b/utils/TableGen/PseudoLoweringEmitter.cpp
index eca02498c0d64bb0d95bb5f36e384a0ccc773837..d3e23890a815cc1ceff6f445919dbe42d4dfb2b6 100644 (file)
--- a/utils/TableGen/PseudoLoweringEmitter.cpp
+++ b/utils/TableGen/PseudoLoweringEmitter.cpp
@@ -67,7 +67,7 @@ addDagOperandMapping(Record *Rec, DagInit *Dag, CodeGenInstruction &Insn,
       // Since we added more than one, we also need to adjust the base.
       BaseIdx += NewOps - 1;
     } else
-      assert(0 && "Unhandled pseudo-expansion argument type!");
+      llvm_unreachable("Unhandled pseudo-expansion argument type!");
   }
   return OpsAdded;
 }

diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp
index 1399fdeee7c12a265592db80d4612db63370d480..9bb2f99408e898d810ee011809c948a6c5bbf87c 100644 (file)
--- a/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/utils/TableGen/RegisterInfoEmitter.cpp
@@ -134,8 +134,7 @@ RegisterInfoEmitter::EmitRegMapping(raw_ostream &OS,
       OS << "EHFlavour";
     OS << ") {\n"
      << "  default:\n"
-     << "    assert(0 && \"Unknown DWARF flavour\");\n"
-     << "    break;\n";
+     << "    llvm_unreachable(\"Unknown DWARF flavour\");\n";
 
     for (unsigned i = 0, e = maxLength; i != e; ++i) {
       OS << "  case " << i << ":\n";
@@ -180,8 +179,7 @@ RegisterInfoEmitter::EmitRegMapping(raw_ostream &OS,
       OS << "EHFlavour";
     OS << ") {\n"
        << "  default:\n"
-       << "    assert(0 && \"Unknown DWARF flavour\");\n"
-       << "    break;\n";
+       << "    llvm_unreachable(\"Unknown DWARF flavour\");\n";
 
     for (unsigned i = 0, e = maxLength; i != e; ++i) {
       OS << "  case " << i << ":\n";