Migrate llc and the JIT to using the TargetRegistry for lookups.

- They still use the TargetMachineRegistry to populate the contents of the
   -march option (via the listener interface). We can't just populate it in the
   option parser because we can't expect the TargetRegistry to be populated yet
   (we no longer rely on static constructors).

 - There are a couple ways to finish killing off TargetMachineRegistry, but I
   haven't figured out the cleanest one yet...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75773 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetRegistry.h

@@ -89,6 +89,10 @@ namespace llvm {
     /// getShortDescription - Get a short description of the target.
     const char *getShortDescription() const { return ShortDesc; }
 
+    /// getJITMatchQuality - Get the quality of this targets match for use as a
+    /// JIT.
+    unsigned getJITMatchQuality() const { return JITMatchQualityFn(); }
+
     /// createTargetMachine - Create a target specific machine implementation.
     TargetMachine *createTargetMachine(const Module &M,
                                        const std::string &Features) const {

lib/ExecutionEngine/JIT/TargetSelect.cpp

@@ -45,16 +45,16 @@ ExecutionEngine *JIT::createJIT(ModuleProvider *MP, std::string *ErrorStr,
                                 JITMemoryManager *JMM,
                                 CodeGenOpt::Level OptLevel,
                                 bool AllocateGVsWithCode) {
-  const TargetMachineRegistry::entry *TheArch = MArch;
+  const Target *TheTarget;
-  if (TheArch == 0) {
+  if (MArch == 0) {
     std::string Error;
-    TheArch = TargetMachineRegistry::getClosestTargetForJIT(Error);
+    TheTarget = TargetRegistry::getClosestTargetForJIT(Error);
-    if (TheArch == 0) {
+    if (TheTarget == 0) {
       if (ErrorStr)
         *ErrorStr = Error;
       return 0;
     }
-  } else if (TheArch->JITMatchQualityFn() == 0) {
+  } else if (TheTarget->getJITMatchQuality() == 0) {
     cerr << "WARNING: This target JIT is not designed for the host you are"
          << " running.  If bad things happen, please choose a different "
          << "-march switch.\n";
@@ -71,7 +71,8 @@ ExecutionEngine *JIT::createJIT(ModuleProvider *MP, std::string *ErrorStr,
   }
 
   // Allocate a target...
-  TargetMachine *Target = TheArch->CtorFn(*MP->getModule(), FeaturesStr);
+  TargetMachine *Target = 
+    TheTarget->createTargetMachine(*MP->getModule(), FeaturesStr);
   assert(Target && "Could not allocate target machine!");
 
   // If the target supports JIT code generation, return a new JIT now.

tools/llc/llc.cpp

@@ -128,7 +128,8 @@ GetFileNameRoot(const std::string &InputFilename) {
   return outputFilename;
 }
 
-static formatted_raw_ostream *GetOutputStream(const char *ProgName) {
+static formatted_raw_ostream *GetOutputStream(const char *TargetName, 
+                                              const char *ProgName) {
   if (OutputFilename != "") {
     if (OutputFilename == "-")
       return &fouts();
@@ -169,10 +170,10 @@ static formatted_raw_ostream *GetOutputStream(const char *ProgName) {
   bool Binary = false;
   switch (FileType) {
   case TargetMachine::AssemblyFile:
-    if (MArch->Name[0] == 'c') {
+    if (TargetName[0] == 'c') {
-      if (MArch->Name[1] == 0)
+      if (TargetName[1] == 0)
         OutputFilename += ".cbe.c";
-      else if (MArch->Name[1] == 'p' && MArch->Name[2] == 'p')
+      else if (TargetName[1] == 'p' && TargetName[2] == 'p')
         OutputFilename += ".cpp";
       else
         OutputFilename += ".s";
@@ -248,10 +249,13 @@ int main(int argc, char **argv) {
 
   // Allocate target machine.  First, check whether the user has
   // explicitly specified an architecture to compile for.
-  if (MArch == 0) {
+  const Target *TheTarget;
+  if (MArch) {
+    TheTarget = &MArch->TheTarget;
+  } else {
     std::string Err;
-    MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
+    TheTarget = TargetRegistry::getClosestStaticTargetForModule(mod, Err);
-    if (MArch == 0) {
+    if (TheTarget == 0) {
       std::cerr << argv[0] << ": error auto-selecting target for module '"
                 << Err << "'.  Please use the -march option to explicitly "
                 << "pick a target.\n";
@@ -269,12 +273,13 @@ int main(int argc, char **argv) {
     FeaturesStr = Features.getString();
   }
 
-  std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, FeaturesStr));
+  std::auto_ptr<TargetMachine> 
+    target(TheTarget->createTargetMachine(mod, FeaturesStr));
   assert(target.get() && "Could not allocate target machine!");
   TargetMachine &Target = *target.get();
 
   // Figure out where we are going to send the output...
-  formatted_raw_ostream *Out = GetOutputStream(argv[0]);
+  formatted_raw_ostream *Out = GetOutputStream(TheTarget->getName(), argv[0]);
   if (Out == 0) return 1;
 
   CodeGenOpt::Level OLvl = CodeGenOpt::Default;