Add an option to specify the target C++ ABI to the frontend. Use it to

select either the default Itanium ABI or the new, experimental Microsoft ABI.

llvm-svn: 105804

clang/include/clang/Basic/DiagnosticCommonKinds.td

@@ -66,6 +66,7 @@ def err_target_unknown_triple : Error<
   "unknown target triple '%0', please use -triple or -arch">;
 def err_target_unknown_cpu : Error<"unknown target CPU '%0'">;
 def err_target_unknown_abi : Error<"unknown target ABI '%0'">;
+def err_target_unknown_cxxabi : Error<"unknown C++ ABI '%0'">;
 def err_target_invalid_feature : Error<"invalid target feature '%0'">;
 
 // Source manager

clang/include/clang/Basic/TargetInfo.h

@@ -58,6 +58,7 @@ protected:
   const char *UserLabelPrefix;
   const llvm::fltSemantics *FloatFormat, *DoubleFormat, *LongDoubleFormat;
   unsigned char RegParmMax, SSERegParmMax;
+  std::string CXXABI;
 
   unsigned HasAlignMac68kSupport : 1;
 
@@ -396,6 +397,11 @@ public:
     return "";
   }
 
+  /// getCXXABI - Get the C++ ABI in use.
+  virtual llvm::StringRef getCXXABI() const {
+    return CXXABI;
+  }
+
   /// setCPU - Target the specific CPU.
   ///
   /// \return - False on error (invalid CPU name).
@@ -412,6 +418,16 @@ public:
     return false;
   }
 
+  /// setCXXABI - Use this specific C++ ABI.
+  ///
+  /// \return - False on error (invalid ABI name).
+  virtual bool setCXXABI(const std::string &Name) {
+    if (Name != "itanium" && Name != "microsoft")
+      return false;
+    CXXABI = Name;
+    return true;
+  }
+
   /// setFeatureEnabled - Enable or disable a specific target feature,
   /// the feature name must be valid.
   ///

clang/include/clang/Basic/TargetOptions.h

@@ -29,6 +29,10 @@ public:
   /// If given, the name of the target ABI to use.
   std::string ABI;
 
+  /// If given, the name of the target C++ ABI to use. If not given, defaults
+  /// to "itanium".
+  std::string CXXABI;
+
   /// The list of target specific features to enable or disable -- this should
   /// be a list of strings starting with by '+' or '-'.
   std::vector<std::string> Features;

clang/include/clang/Driver/CC1Options.td

@@ -18,6 +18,8 @@ include "OptParser.td"
 // Target Options
 //===----------------------------------------------------------------------===//
 
+def cxx_abi : Separate<"-cxx-abi">,
+  HelpText<"Target a particular C++ ABI type">;
 def target_abi : Separate<"-target-abi">,
   HelpText<"Target a particular ABI type">;
 def target_cpu : Separate<"-target-cpu">,

clang/lib/Basic/Targets.cpp

@@ -2475,6 +2475,12 @@ TargetInfo *TargetInfo::CreateTargetInfo(Diagnostic &Diags,
     return 0;
   }
 
+  // Set the target C++ ABI.
+  if (!Target->setCXXABI(Opts.CXXABI)) {
+    Diags.Report(diag::err_target_unknown_cxxabi) << Opts.CXXABI;
+    return 0;
+  }
+
   // Compute the default target features, we need the target to handle this
   // because features may have dependencies on one another.
   llvm::StringMap<bool> Features;

clang/lib/CodeGen/CodeGenModule.cpp

@@ -86,8 +86,10 @@ void CodeGenModule::createObjCRuntime() {
 }
 
 void CodeGenModule::createCXXABI() {
-  // For now, just create an Itanium ABI.
+  if (Context.Target.getCXXABI() == "microsoft")
-  ABI = CreateItaniumCXXABI(*this);
+    ABI = CreateMicrosoftCXXABI(*this);
+  else
+    ABI = CreateItaniumCXXABI(*this);
 }
 
 void CodeGenModule::Release() {

clang/lib/CodeGen/MicrosoftCXXABI.cpp

@@ -124,7 +124,7 @@ void MicrosoftMangleContext::mangleCXXDtor(const CXXDestructorDecl *D,
   assert(false && "Can't yet mangle destructors!");
 }
 
-CXXABI *CreateMicrosoftCXXABI(CodeGenModule &CGM) {
+CXXABI *clang::CodeGen::CreateMicrosoftCXXABI(CodeGenModule &CGM) {
   return new MicrosoftCXXABI(CGM);
 }
 

clang/lib/Frontend/ASTUnit.cpp

@@ -219,6 +219,7 @@ ASTUnit *ASTUnit::LoadFromPCHFile(const std::string &Filename,
   // FIXME: This is broken, we should store the TargetOptions in the PCH.
   TargetOptions TargetOpts;
   TargetOpts.ABI = "";
+  TargetOpts.CXXABI = "itanium";
   TargetOpts.CPU = "";
   TargetOpts.Features.clear();
   TargetOpts.Triple = TargetTriple;

clang/lib/Frontend/CompilerInvocation.cpp

@@ -680,6 +680,8 @@ static void TargetOptsToArgs(const TargetOptions &Opts,
     Res.push_back("-target-abi");
     Res.push_back(Opts.ABI);
   }
+  Res.push_back("-cxx-abi");
+  Res.push_back(Opts.CXXABI);
   for (unsigned i = 0, e = Opts.Features.size(); i != e; ++i) {
     Res.push_back("-target-feature");
     Res.push_back(Opts.Features[i]);
@@ -1367,6 +1369,7 @@ static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
   using namespace cc1options;
   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
+  Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
   Opts.Triple = Args.getLastArgValue(OPT_triple);
   Opts.Features = Args.getAllArgValues(OPT_target_feature);
@@ -1374,6 +1377,10 @@ static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
   // Use the host triple if unspecified.
   if (Opts.Triple.empty())
     Opts.Triple = llvm::sys::getHostTriple();
+
+  // Use the Itanium C++ ABI if unspecified.
+  if (Opts.CXXABI.empty())
+    Opts.CXXABI = "itanium";
 }
 
 //