Use an enum value instead of a string.

The old StringSwitch use was also broken. It assumed that a
StringSwitch returns Optional<T> instead of T and was missing a
.Default.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@322792 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Frontend/CodeGenOptions.h

@@ -16,6 +16,7 @@
 
 #include "clang/Basic/DebugInfoOptions.h"
 #include "clang/Basic/Sanitizers.h"
+#include "llvm/Support/CodeGen.h"
 #include "llvm/Support/Regex.h"
 #include "llvm/Target/TargetOptions.h"
 #include <map>
@@ -167,7 +168,7 @@ public:
   std::string SplitDwarfFile;
 
   /// The name of the relocation model to use.
-  std::string RelocationModel;
+  llvm::Reloc::Model RelocationModel;
 
   /// The thread model to use
   std::string ThreadModel;

lib/CodeGen/BackendUtil.cpp

@@ -362,21 +362,6 @@ getCodeModel(const CodeGenOptions &CodeGenOpts) {
   return static_cast<llvm::CodeModel::Model>(CodeModel);
 }
 
-static llvm::Reloc::Model getRelocModel(const CodeGenOptions &CodeGenOpts) {
-  // Keep this synced with the equivalent code in
-  // lib/Frontend/CompilerInvocation.cpp
-  llvm::Optional<llvm::Reloc::Model> RM;
-  RM = llvm::StringSwitch<llvm::Reloc::Model>(CodeGenOpts.RelocationModel)
-      .Case("static", llvm::Reloc::Static)
-      .Case("pic", llvm::Reloc::PIC_)
-      .Case("ropi", llvm::Reloc::ROPI)
-      .Case("rwpi", llvm::Reloc::RWPI)
-      .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
-      .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC);
-  assert(RM.hasValue() && "invalid PIC model!");
-  return *RM;
-}
-
 static TargetMachine::CodeGenFileType getCodeGenFileType(BackendAction Action) {
   if (Action == Backend_EmitObj)
     return TargetMachine::CGFT_ObjectFile;
@@ -692,7 +677,7 @@ void EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
   Optional<llvm::CodeModel::Model> CM = getCodeModel(CodeGenOpts);
   std::string FeaturesStr =
       llvm::join(TargetOpts.Features.begin(), TargetOpts.Features.end(), ",");
-  llvm::Reloc::Model RM = getRelocModel(CodeGenOpts);
+  llvm::Reloc::Model RM = CodeGenOpts.RelocationModel;
   CodeGenOpt::Level OptLevel = getCGOptLevel(CodeGenOpts);
 
   llvm::TargetOptions Options;
@@ -1113,7 +1098,7 @@ static void runThinLTOBackend(ModuleSummaryIndex *CombinedIndex, Module *M,
   Conf.CPU = TOpts.CPU;
   Conf.CodeModel = getCodeModel(CGOpts);
   Conf.MAttrs = TOpts.Features;
-  Conf.RelocModel = getRelocModel(CGOpts);
+  Conf.RelocModel = CGOpts.RelocationModel;
   Conf.CGOptLevel = getCGOptLevel(CGOpts);
   initTargetOptions(Conf.Options, CGOpts, TOpts, LOpts, HeaderOpts);
   Conf.SampleProfile = std::move(SampleProfile);

lib/Frontend/CodeGenOptions.cpp

@@ -17,7 +17,7 @@ CodeGenOptions::CodeGenOptions() {
 #define ENUM_CODEGENOPT(Name, Type, Bits, Default) set##Name(Default);
 #include "clang/Frontend/CodeGenOptions.def"
 
-  RelocationModel = "pic";
+  RelocationModel = llvm::Reloc::PIC_;
   memcpy(CoverageVersion, "402*", 4);
 }
 

lib/Frontend/CompilerInvocation.cpp

@@ -330,15 +330,23 @@ static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
   return "default";
 }
 
-static StringRef getRelocModel(ArgList &Args, DiagnosticsEngine &Diags) {
+static llvm::Reloc::Model getRelocModel(ArgList &Args,
+                                        DiagnosticsEngine &Diags) {
   if (Arg *A = Args.getLastArg(OPT_mrelocation_model)) {
     StringRef Value = A->getValue();
-    if (Value == "static" || Value == "pic" || Value == "ropi" ||
-        Value == "rwpi" || Value == "ropi-rwpi" || Value == "dynamic-no-pic")
-      return Value;
+    auto RM = llvm::StringSwitch<llvm::Optional<llvm::Reloc::Model>>(Value)
+                  .Case("static", llvm::Reloc::Static)
+                  .Case("pic", llvm::Reloc::PIC_)
+                  .Case("ropi", llvm::Reloc::ROPI)
+                  .Case("rwpi", llvm::Reloc::RWPI)
+                  .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
+                  .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
+                  .Default(None);
+    if (RM.hasValue())
+      return *RM;
     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
   }
-  return "pic";
+  return llvm::Reloc::PIC_;
 }
 
 /// \brief Create a new Regex instance out of the string value in \p RpassArg.