Make TargetPassConfig an ImmutablePass so CodeGenPasses can query options

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149752 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/Passes.h

@@ -15,6 +15,7 @@
 #ifndef LLVM_CODEGEN_PASSES_H
 #define LLVM_CODEGEN_PASSES_H
 
+#include "llvm/Pass.h"
 #include "llvm/Target/TargetMachine.h"
 #include <string>
 
@@ -32,9 +33,12 @@ namespace llvm {
 
 /// Target-Independent Code Generator Pass Configuration Options.
 ///
+/// This is an ImmutablePass solely for the purpose of exposing CodeGen options
+/// to the internals of other CodeGen passes.
+///
 /// FIXME: Why are we passing the DisableVerify flags around instead of setting
 /// an options in the target machine, like all the other driver options?
-class TargetPassConfig {
+class TargetPassConfig : public ImmutablePass {
 protected:
   TargetMachine *TM;
   PassManagerBase &PM;
@@ -43,8 +47,12 @@ protected:
 public:
   TargetPassConfig(TargetMachine *tm, PassManagerBase &pm,
                    bool DisableVerifyFlag);
+  // Dummy constructor.
+  TargetPassConfig();
 
-  virtual ~TargetPassConfig() {}
+  virtual ~TargetPassConfig();
+
+  static char ID;
 
   /// Get the right type of TargetMachine for this target.
   template<typename TMC> TMC &getTM() const {

include/llvm/InitializePasses.h

@@ -228,6 +228,7 @@ void initializeStripNonDebugSymbolsPass(PassRegistry&);
 void initializeStripSymbolsPass(PassRegistry&);
 void initializeStrongPHIEliminationPass(PassRegistry&);
 void initializeTailCallElimPass(PassRegistry&);
+void initializeTargetPassConfigPass(PassRegistry&);
 void initializeTargetDataPass(PassRegistry&);
 void initializeTargetLibraryInfoPass(PassRegistry&);
 void initializeTwoAddressInstructionPassPass(PassRegistry&);

lib/CodeGen/CodeGen.cpp

@@ -49,6 +49,7 @@ void llvm::initializeCodeGen(PassRegistry &Registry) {
   initializeStackProtectorPass(Registry);
   initializeStackSlotColoringPass(Registry);
   initializeStrongPHIEliminationPass(Registry);
+  initializeTargetPassConfigPass(Registry);
   initializeTwoAddressInstructionPassPass(Registry);
   initializeUnreachableBlockElimPass(Registry);
   initializeUnreachableMachineBlockElimPass(Registry);

lib/CodeGen/LLVMTargetMachine.cpp

@@ -125,27 +125,14 @@ LLVMTargetMachine::LLVMTargetMachine(const Target &T, StringRef Triple,
          "and that InitializeAllTargetMCs() is being invoked!");
 }
 
-TargetPassConfig::TargetPassConfig(TargetMachine *tm, PassManagerBase &pm,
-                                   bool DisableVerifyFlag)
-  : TM(tm), PM(pm), DisableVerify(DisableVerifyFlag) {
-  // Register all target independent codegen passes to activate their PassIDs.
-  initializeCodeGen(*PassRegistry::getPassRegistry());
-}
-
-/// createPassConfig - Create a pass configuration object to be used by
-/// addPassToEmitX methods for generating a pipeline of CodeGen passes.
-TargetPassConfig *LLVMTargetMachine::createPassConfig(PassManagerBase &PM,
-                                                      bool DisableVerify) {
-  return new TargetPassConfig(this, PM, DisableVerify);
-}
-
 bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
                                             formatted_raw_ostream &Out,
                                             CodeGenFileType FileType,
                                             bool DisableVerify) {
   // Add common CodeGen passes.
   MCContext *Context = 0;
-  OwningPtr<TargetPassConfig> PassConfig(createPassConfig(PM, DisableVerify));
+  TargetPassConfig *PassConfig = createPassConfig(PM, DisableVerify);
+  PM.add(PassConfig);
   if (PassConfig->addCodeGenPasses(Context))
     return true;
   assert(Context != 0 && "Failed to get MCContext");

lib/CodeGen/Passes.cpp

@@ -14,9 +14,43 @@
 
 #include "llvm/CodeGen/RegAllocRegistry.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/ErrorHandling.h"
 
 using namespace llvm;
 
+//===---------------------------------------------------------------------===//
+/// TargetPassConfig
+//===---------------------------------------------------------------------===//
+
+INITIALIZE_PASS(TargetPassConfig, "targetpassconfig",
+                "Target Pass Configuration", false, false)
+char TargetPassConfig::ID = 0;
+
+// Out of line virtual method.
+TargetPassConfig::~TargetPassConfig() {}
+
+TargetPassConfig::TargetPassConfig(TargetMachine *tm, PassManagerBase &pm,
+                                   bool DisableVerifyFlag)
+  : ImmutablePass(ID), TM(tm), PM(pm), DisableVerify(DisableVerifyFlag) {
+  // Register all target independent codegen passes to activate their PassIDs,
+  // including this pass itself.
+  initializeCodeGen(*PassRegistry::getPassRegistry());
+}
+
+/// createPassConfig - Create a pass configuration object to be used by
+/// addPassToEmitX methods for generating a pipeline of CodeGen passes.
+///
+/// Targets may override this to extend TargetPassConfig.
+TargetPassConfig *LLVMTargetMachine::createPassConfig(PassManagerBase &PM,
+                                                      bool DisableVerify) {
+  return new TargetPassConfig(this, PM, DisableVerify);
+}
+
+TargetPassConfig::TargetPassConfig()
+  : ImmutablePass(ID), PM(*(PassManagerBase*)0) {
+  llvm_unreachable("TargetPassConfig should not be constructed on-the-fly");
+}
+
 //===---------------------------------------------------------------------===//
 ///
 /// RegisterRegAlloc class - Track the registration of register allocators.