Added TargetPassConfig. The first little step toward configuring codegen passes.

Allows command line overrides to be centralized in LLVMTargetMachine.cpp.
LLVMTargetMachine can intercept common passes and give precedence to command line overrides.
Allows adding "internal" target configuration options without touching TargetOptions.
Encapsulates the PassManager.
Provides a good point to initialize all CodeGen passes so that Pass ID's can be used in APIs.
Allows modifying the target configuration hooks without rebuilding the world.

llvm-svn: 149672

2 files changed, 28 insertions, 6 deletions

diff --git a/llvm/lib/Target/MBlaze/MBlazeTargetMachine.cpp b/llvm/lib/Target/MBlaze/MBlazeTargetMachine.cpp
index 5ed81dd28be..aad3500ffde 100644
--- a/llvm/lib/Target/MBlaze/MBlazeTargetMachine.cpp
+++ b/llvm/lib/Target/MBlaze/MBlazeTargetMachine.cpp
@@ -45,17 +45,39 @@ MBlazeTargetMachine(const Target &T, StringRef TT,
     InstrItins(Subtarget.getInstrItineraryData()) {
 }
 
+namespace {
+/// MBlaze Code Generator Pass Configuration Options.
+class MBlazePassConfig : public TargetPassConfig {
+public:
+  MBlazePassConfig(MBlazeTargetMachine *TM, PassManagerBase &PM,
+                   bool DisableVerifyFlag)
+    : TargetPassConfig(TM, PM, DisableVerifyFlag) {}
+
+  MBlazeTargetMachine &getMBlazeTargetMachine() const {
+    return getTM<MBlazeTargetMachine>();
+  }
+
+  virtual bool addInstSelector();
+  virtual bool addPreEmitPass();
+};
+} // namespace
+
+TargetPassConfig *MBlazeTargetMachine::createPassConfig(PassManagerBase &PM,
+                                                        bool DisableVerify) {
+  return new MBlazePassConfig(this, PM, DisableVerify);
+}
+
 // Install an instruction selector pass using
 // the ISelDag to gen MBlaze code.
-bool MBlazeTargetMachine::addInstSelector(PassManagerBase &PM) {
-  PM.add(createMBlazeISelDag(*this));
+bool MBlazePassConfig::addInstSelector() {
+  PM.add(createMBlazeISelDag(getMBlazeTargetMachine()));
   return false;
 }
 
 // Implemented by targets that want to run passes immediately before
 // machine code is emitted. return true if -print-machineinstrs should
 // print out the code after the passes.
-bool MBlazeTargetMachine::addPreEmitPass(PassManagerBase &PM) {
-  PM.add(createMBlazeDelaySlotFillerPass(*this));
+bool MBlazePassConfig::addPreEmitPass() {
+  PM.add(createMBlazeDelaySlotFillerPass(getMBlazeTargetMachine()));
   return true;
 }
diff --git a/llvm/lib/Target/MBlaze/MBlazeTargetMachine.h b/llvm/lib/Target/MBlaze/MBlazeTargetMachine.h
index 036f1b6cf52..58fcbfd6719 100644
--- a/llvm/lib/Target/MBlaze/MBlazeTargetMachine.h
+++ b/llvm/lib/Target/MBlaze/MBlazeTargetMachine.h
@@ -79,8 +79,8 @@ namespace llvm {
     }
 
     // Pass Pipeline Configuration
-    virtual bool addInstSelector(PassManagerBase &PM);
-    virtual bool addPreEmitPass(PassManagerBase &PM);
+    virtual TargetPassConfig *createPassConfig(PassManagerBase &PM,
+                                               bool DisableVerify);
   };
 } // End llvm namespace