Subzero: Add locking to prepare for multithreaded translation.

src/IceTranslator.cpp

 //===- subzero/src/IceTranslator.cpp - ICE to machine code ------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the general driver class for translating ICE to
@@ skipping 32 matching lines @@
 IceString Translator::createUnnamedName(const IceString &Prefix, SizeT Index) {
   if (Index == 0)
     return Prefix;
   std::string Buffer;
   llvm::raw_string_ostream StrBuf(Buffer);
   StrBuf << Prefix << Index;
   return StrBuf.str();
 }
 
 bool Translator::checkIfUnnamedNameSafe(const IceString &Name, const char *Kind,
-                                        const IceString &Prefix,
-                                        Ostream &Stream) {
+                                        const IceString &Prefix) {
   if (Name.find(Prefix) == 0) {
     for (size_t i = Prefix.size(); i < Name.size(); ++i) {
       if (!isdigit(Name[i])) {
         return false;
       }
     }
+    OstreamLocker L(Ctx);
+    Ostream &Stream = Ctx->getStrDump();
     Stream << "Warning : Default " << Kind << " prefix '" << Prefix
            << "' potentially conflicts with name '" << Name << "'.\n";
     return true;
   }
   return false;
 }
 
 void Translator::translateFcn(Cfg *Fcn) {
   Ctx->resetStats();
   Func.reset(Fcn);
@@ skipping 30 matching lines @@
     Func->getTarget()->emitConstants();
 }
 
 void Translator::lowerGlobals(
     const VariableDeclarationListType &VariableDeclarations) {
   std::unique_ptr<TargetGlobalInitLowering> GlobalLowering(
       TargetGlobalInitLowering::createLowering(Ctx->getTargetArch(), Ctx));
   bool DisableTranslation = Ctx->getFlags().DisableTranslation;
   const bool DumpGlobalVariables =
       ALLOW_DUMP && Ctx->isVerbose() && Ctx->getFlags().VerboseFocusOn.empty();
+  OstreamLocker L(Ctx);
   Ostream &Stream = Ctx->getStrDump();
   const IceString &TranslateOnly = Ctx->getFlags().TranslateOnly;
   for (const Ice::VariableDeclaration *Global : VariableDeclarations) {
     if (DumpGlobalVariables)
       Global->dump(getContext(), Stream);
     if (!DisableTranslation &&
         matchSymbolName(Global->getName(), TranslateOnly))
       GlobalLowering->lower(*Global);
   }
   GlobalLowering.reset();
 }