Revert r77654, it appears to be causing llvm-gcc bootstrap failures, and many

failures when building assorted projects with clang.

--- Reverse-merging r77654 into '.':
U    include/llvm/CodeGen/Passes.h
U    include/llvm/CodeGen/MachineFunctionPass.h
U    include/llvm/CodeGen/MachineFunction.h
U    include/llvm/CodeGen/LazyLiveness.h
U    include/llvm/CodeGen/SelectionDAGISel.h
D    include/llvm/CodeGen/MachineFunctionAnalysis.h
U    include/llvm/Function.h
U    lib/Target/CellSPU/SPUISelDAGToDAG.cpp
U    lib/Target/PowerPC/PPCISelDAGToDAG.cpp
U    lib/CodeGen/LLVMTargetMachine.cpp
U    lib/CodeGen/MachineVerifier.cpp
U    lib/CodeGen/MachineFunction.cpp
U    lib/CodeGen/PrologEpilogInserter.cpp
U    lib/CodeGen/MachineLoopInfo.cpp
U    lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
D    lib/CodeGen/MachineFunctionAnalysis.cpp
D    lib/CodeGen/MachineFunctionPass.cpp
U    lib/CodeGen/LiveVariables.cpp


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77661 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LazyLiveness.h

@@ -34,7 +34,6 @@ public:
   void getAnalysisUsage(AnalysisUsage &AU) const {
     AU.setPreservesAll();
     AU.addRequired<MachineDominatorTree>();
-    MachineFunctionPass::getAnalysisUsage(AU);
   }
   
   bool runOnMachineFunction(MachineFunction &mf);

include/llvm/CodeGen/MachineFunction.h

@@ -67,7 +67,7 @@ struct MachineFunctionInfo {
 };
 
 class MachineFunction : private Annotation {
-  Function *Fn;
+  const Function *Fn;
   const TargetMachine &Target;
 
   // RegInfo - Information about each register in use in the function.
@@ -115,12 +115,12 @@ class MachineFunction : private Annotation {
   unsigned Alignment;
 
 public:
-  MachineFunction(Function *Fn, const TargetMachine &TM);
+  MachineFunction(const Function *Fn, const TargetMachine &TM);
   ~MachineFunction();
 
   /// getFunction - Return the LLVM function that this machine code represents
   ///
-  Function *getFunction() const { return Fn; }
+  const Function *getFunction() const { return Fn; }
 
   /// getTarget - Return the target machine this machine code is compiled with
   ///
@@ -229,6 +229,21 @@ public:
   ///
   void dump() const;
 
+  /// construct - Allocate and initialize a MachineFunction for a given Function
+  /// and Target
+  ///
+  static MachineFunction& construct(const Function *F, const TargetMachine &TM);
+
+  /// destruct - Destroy the MachineFunction corresponding to a given Function
+  ///
+  static void destruct(const Function *F);
+
+  /// get - Return a handle to a MachineFunction corresponding to the given
+  /// Function.  This should not be called before "construct()" for a given
+  /// Function.
+  ///
+  static MachineFunction& get(const Function *F);
+
   // Provide accessors for the MachineBasicBlock list...
   typedef BasicBlockListType::iterator iterator;
   typedef BasicBlockListType::const_iterator const_iterator;

include/llvm/CodeGen/MachineFunctionAnalysis.h

@@ -1,49 +0,0 @@
-//===-- MachineFunctionAnalysis.h - Owner of MachineFunctions ----*-C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file declares the MachineFunctionAnalysis class.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CODEGEN_MACHINE_FUNCTION_ANALYSIS_H
-#define LLVM_CODEGEN_MACHINE_FUNCTION_ANALYSIS_H
-
-#include "llvm/Pass.h"
-#include "llvm/Target/TargetMachine.h"
-
-namespace llvm {
-
-class MachineFunction;
-
-/// MachineFunctionAnalysis - This class is a Pass that manages a
-/// MachineFunction object.
-struct MachineFunctionAnalysis : public FunctionPass {
-private:
-  const TargetMachine &TM;
-  CodeGenOpt::Level OptLevel;
-  MachineFunction *MF;
-
-public:
-  static char ID;
-  explicit MachineFunctionAnalysis(TargetMachine &tm,
-                                   CodeGenOpt::Level OL = CodeGenOpt::Default);
-
-
-  MachineFunction &getMF() const { return *MF; }
-  CodeGenOpt::Level getOptLevel() const { return OptLevel; }
-
-private:
-  virtual bool runOnFunction(Function &F);
-  virtual void releaseMemory();
-  virtual void getAnalysisUsage(AnalysisUsage &AU) const;
-};
-
-} // End llvm namespace
-
-#endif

include/llvm/CodeGen/MachineFunctionPass.h

@@ -24,25 +24,19 @@
 
 namespace llvm {
 
-/// MachineFunctionPass - This class adapts the FunctionPass interface to
-/// allow convenient creation of passes that operate on the MachineFunction
-/// representation. Instead of overriding runOnFunction, subclasses
-/// override runOnMachineFunction.
-class MachineFunctionPass : public FunctionPass {
-protected:
+  // FIXME: This pass should declare that the pass does not invalidate any LLVM
+  // passes.
+struct MachineFunctionPass : public FunctionPass {
   explicit MachineFunctionPass(intptr_t ID) : FunctionPass(ID) {}
   explicit MachineFunctionPass(void *ID) : FunctionPass(ID) {}
 
+protected:
   /// runOnMachineFunction - This method must be overloaded to perform the
   /// desired machine code transformation or analysis.
   ///
   virtual bool runOnMachineFunction(MachineFunction &MF) = 0;
 
-  /// getAnalysisUsage - Subclasses that override getAnalysisUsage
-  /// must call this.
-  virtual void getAnalysisUsage(AnalysisUsage &AU) const;
-
-private:
+public:
   bool runOnFunction(Function &F);
 };
 

include/llvm/CodeGen/Passes.h

@@ -146,6 +146,11 @@ namespace llvm {
   /// by seeing if the labels map to the same reduced label.
   FunctionPass *createDebugLabelFoldingPass();
 
+  /// MachineCodeDeletion Pass - This pass deletes all of the machine code for
+  /// the current function, which should happen after the function has been
+  /// emitted to a .s file or to memory.
+  FunctionPass *createMachineCodeDeleter();
+
   /// getRegisterAllocator - This creates an instance of the register allocator
   /// for the Sparc.
   FunctionPass *getRegisterAllocator(TargetMachine &T);

include/llvm/CodeGen/SelectionDAGISel.h

@@ -19,7 +19,6 @@
 #include "llvm/Pass.h"
 #include "llvm/Constant.h"
 #include "llvm/CodeGen/SelectionDAG.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
 
 namespace llvm {
   class FastISel;
@@ -40,7 +39,7 @@ namespace llvm {
  
 /// SelectionDAGISel - This is the common base class used for SelectionDAG-based
 /// pattern-matching instruction selectors.
-class SelectionDAGISel : public MachineFunctionPass {
+class SelectionDAGISel : public FunctionPass {
 public:
   const TargetMachine &TM;
   TargetLowering &TLI;
@@ -63,7 +62,7 @@ public:
 
   virtual void getAnalysisUsage(AnalysisUsage &AU) const;
 
-  virtual bool runOnMachineFunction(MachineFunction &MF);
+  virtual bool runOnFunction(Function &Fn);
 
   unsigned MakeReg(MVT VT);
 

include/llvm/Function.h

@@ -21,6 +21,7 @@
 #include "llvm/GlobalValue.h"
 #include "llvm/BasicBlock.h"
 #include "llvm/Argument.h"
+#include "llvm/Support/Annotation.h"
 #include "llvm/Attributes.h"
 
 namespace llvm {
@@ -65,7 +66,7 @@ private:
   mutable ilist_node<Argument> Sentinel;
 };
 
-class Function : public GlobalValue,
+class Function : public GlobalValue, public Annotable,
                  public ilist_node<Function> {
 public:
   typedef iplist<Argument> ArgumentListType;

lib/CodeGen/LLVMTargetMachine.cpp

@@ -18,7 +18,6 @@
 #include "llvm/Analysis/LoopPass.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/GCStrategy.h"
-#include "llvm/CodeGen/MachineFunctionAnalysis.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetRegistry.h"
@@ -119,6 +118,9 @@ bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
 
   PM.add(createGCInfoDeleter());
 
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+
   return false; // success!
 }
 
@@ -135,6 +137,9 @@ bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
 
   PM.add(createGCInfoDeleter());
 
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+
   return false; // success!
 }
 
@@ -151,6 +156,9 @@ bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
 
   PM.add(createGCInfoDeleter());
 
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+
   return false; // success!
 }
 
@@ -176,6 +184,9 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
 
   PM.add(createGCInfoDeleter());
 
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+
   return false; // success!
 }
 
@@ -201,6 +212,9 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
 
   PM.add(createGCInfoDeleter());
 
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+
   return false; // success!
 }
 
@@ -251,9 +265,6 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
 
   // Standard Lower-Level Passes.
 
-  // Set up a MachineFunction for the rest of CodeGen to work on.
-  PM.add(new MachineFunctionAnalysis(*this, OptLevel));
-
   // Enable FastISel with -fast, but allow that to be overridden.
   if (EnableFastISelOption == cl::BOU_TRUE ||
       (OptLevel == CodeGenOpt::None && EnableFastISelOption != cl::BOU_FALSE))

lib/CodeGen/LiveVariables.cpp

@@ -48,7 +48,6 @@ static RegisterPass<LiveVariables> X("livevars", "Live Variable Analysis");
 void LiveVariables::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addRequiredID(UnreachableMachineBlockElimID);
   AU.setPreservesAll();
-  MachineFunctionPass::getAnalysisUsage(AU);
 }
 
 void LiveVariables::VarInfo::dump() const {

lib/CodeGen/MachineFunction.cpp

@@ -36,6 +36,15 @@
 #include <sstream>
 using namespace llvm;
 
+bool MachineFunctionPass::runOnFunction(Function &F) {
+  // Do not codegen any 'available_externally' functions at all, they have
+  // definitions outside the translation unit.
+  if (F.hasAvailableExternallyLinkage())
+    return false;
+  
+  return runOnMachineFunction(MachineFunction::get(&F));
+}
+
 namespace {
   struct VISIBILITY_HIDDEN Printer : public MachineFunctionPass {
     static char ID;
@@ -50,7 +59,6 @@ namespace {
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.setPreservesAll();
-      MachineFunctionPass::getAnalysisUsage(AU);
     }
 
     bool runOnMachineFunction(MachineFunction &MF) {
@@ -70,6 +78,31 @@ FunctionPass *llvm::createMachineFunctionPrinterPass(std::ostream *OS,
   return new Printer(OS, Banner);
 }
 
+namespace {
+  struct VISIBILITY_HIDDEN Deleter : public MachineFunctionPass {
+    static char ID;
+    Deleter() : MachineFunctionPass(&ID) {}
+
+    const char *getPassName() const { return "Machine Code Deleter"; }
+
+    bool runOnMachineFunction(MachineFunction &MF) {
+      // Delete the annotation from the function now.
+      MachineFunction::destruct(MF.getFunction());
+      return true;
+    }
+  };
+  char Deleter::ID = 0;
+}
+
+/// MachineCodeDeletion Pass - This pass deletes all of the machine code for
+/// the current function, which should happen after the function has been
+/// emitted to a .s file or to memory.
+FunctionPass *llvm::createMachineCodeDeleter() {
+  return new Deleter();
+}
+
+
+
 //===---------------------------------------------------------------------===//
 // MachineFunction implementation
 //===---------------------------------------------------------------------===//
@@ -78,7 +111,7 @@ void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
   MBB->getParent()->DeleteMachineBasicBlock(MBB);
 }
 
-MachineFunction::MachineFunction(Function *F,
+MachineFunction::MachineFunction(const Function *F,
                                  const TargetMachine &TM)
   : Annotation(AnnotationManager::getID("CodeGen::MachineCodeForFunction")),
     Fn(F), Target(TM) {
@@ -323,6 +356,42 @@ void MachineFunction::viewCFGOnly() const
 #endif // NDEBUG
 }
 
+// The next two methods are used to construct and to retrieve
+// the MachineCodeForFunction object for the given function.
+// construct() -- Allocates and initializes for a given function and target
+// get()       -- Returns a handle to the object.
+//                This should not be called before "construct()"
+//                for a given Function.
+//
+MachineFunction&
+MachineFunction::construct(const Function *Fn, const TargetMachine &Tar)
+{
+  AnnotationID MF_AID =
+                    AnnotationManager::getID("CodeGen::MachineCodeForFunction");
+  assert(Fn->getAnnotation(MF_AID) == 0 &&
+         "Object already exists for this function!");
+  MachineFunction* mcInfo = new MachineFunction(Fn, Tar);
+  Fn->addAnnotation(mcInfo);
+  return *mcInfo;
+}
+
+void MachineFunction::destruct(const Function *Fn) {
+  AnnotationID MF_AID =
+                    AnnotationManager::getID("CodeGen::MachineCodeForFunction");
+  bool Deleted = Fn->deleteAnnotation(MF_AID);
+  assert(Deleted && "Machine code did not exist for function!"); 
+  Deleted = Deleted; // silence warning when no assertions.
+}
+
+MachineFunction& MachineFunction::get(const Function *F)
+{
+  AnnotationID MF_AID =
+                    AnnotationManager::getID("CodeGen::MachineCodeForFunction");
+  MachineFunction *mc = (MachineFunction*)F->getAnnotation(MF_AID);
+  assert(mc && "Call construct() method first to allocate the object");
+  return *mc;
+}
+
 /// addLiveIn - Add the specified physical register as a live-in value and
 /// create a corresponding virtual register for it.
 unsigned MachineFunction::addLiveIn(unsigned PReg,

lib/CodeGen/MachineFunctionAnalysis.cpp

@@ -1,45 +0,0 @@
-//===-- MachineFunctionAnalysis.cpp ---------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains the definitions of the MachineFunctionAnalysis members.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/MachineFunctionAnalysis.h"
-#include "llvm/CodeGen/MachineFunction.h"
-using namespace llvm;
-
-// Register this pass with PassInfo directly to avoid having to define
-// a default constructor.
-static PassInfo
-X("Machine Function Analysis", "machine-function-analysis",
-  intptr_t(&MachineFunctionAnalysis::ID), 0,
-  /*CFGOnly=*/false, /*is_analysis=*/true);
-
-char MachineFunctionAnalysis::ID = 0;
-
-MachineFunctionAnalysis::MachineFunctionAnalysis(TargetMachine &tm,
-                                                 CodeGenOpt::Level OL) :
-  FunctionPass(&ID), TM(tm), OptLevel(OL), MF(0) {
-}
-
-bool MachineFunctionAnalysis::runOnFunction(Function &F) {
-  assert(!MF && "MachineFunctionAnalysis already initialized!");
-  MF = new MachineFunction(&F, TM);
-  return false;
-}
-
-void MachineFunctionAnalysis::releaseMemory() {
-  delete MF;
-  MF = 0;
-}
-
-void MachineFunctionAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
-  AU.setPreservesAll();
-}

lib/CodeGen/MachineFunctionPass.cpp

@@ -1,50 +0,0 @@
-//===-- MachineFunctionPass.cpp -------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains the definitions of the MachineFunctionPass members.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/ScalarEvolution.h"
-#include "llvm/Analysis/IVUsers.h"
-#include "llvm/Analysis/LiveValues.h"
-#include "llvm/Analysis/LoopDependenceAnalysis.h"
-#include "llvm/Analysis/MemoryDependenceAnalysis.h"
-#include "llvm/CodeGen/MachineFunctionAnalysis.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
-using namespace llvm;
-
-bool MachineFunctionPass::runOnFunction(Function &F) {
-  // Do not codegen any 'available_externally' functions at all, they have
-  // definitions outside the translation unit.
-  if (F.hasAvailableExternallyLinkage())
-    return false;
-
-  MachineFunction &MF = getAnalysis<MachineFunctionAnalysis>().getMF();
-  return runOnMachineFunction(MF);
-}
-
-void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
-  AU.addRequired<MachineFunctionAnalysis>();
-
-  // MachineFunctionPass preserves all LLVM IR passes, but there's no
-  // high-level way to express this. Instead, just list a bunch of
-  // passes explicitly.
-  AU.addPreserved<AliasAnalysis>();
-  AU.addPreserved<ScalarEvolution>();
-  AU.addPreserved<IVUsers>();
-  AU.addPreserved<LoopDependenceAnalysis>();
-  AU.addPreserved<MemoryDependenceAnalysis>();
-  AU.addPreserved<LiveValues>();
-  AU.addPreserved<MachineFunctionAnalysis>();
-  AU.setPreservesCFG();
-
-  FunctionPass::getAnalysisUsage(AU);
-}

lib/CodeGen/MachineLoopInfo.cpp

@@ -41,5 +41,4 @@ bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
 void MachineLoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
   AU.addRequired<MachineDominatorTree>();
-  MachineFunctionPass::getAnalysisUsage(AU);
 }

lib/CodeGen/MachineVerifier.cpp

@@ -55,7 +55,6 @@ namespace {
 
     void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.setPreservesAll();
-      MachineFunctionPass::getAnalysisUsage(AU);
     }
 
     bool runOnMachineFunction(MachineFunction &MF);

lib/CodeGen/PrologEpilogInserter.cpp

@@ -111,6 +111,7 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
 
 #if 0
 void PEI::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.setPreservesCFG();
   if (ShrinkWrapping || ShrinkWrapFunc != "") {
     AU.addRequired<MachineLoopInfo>();
     AU.addRequired<MachineDominatorTree>();

lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -29,7 +29,6 @@
 #include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/CodeGen/GCMetadata.h"
 #include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFunctionAnalysis.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
@@ -268,7 +267,7 @@ static void EmitLiveInCopies(MachineBasicBlock *EntryMBB,
 //===----------------------------------------------------------------------===//
 
 SelectionDAGISel::SelectionDAGISel(TargetMachine &tm, CodeGenOpt::Level OL) :
-  MachineFunctionPass(&ID), TM(tm), TLI(*tm.getTargetLowering()),
+  FunctionPass(&ID), TM(tm), TLI(*tm.getTargetLowering()),
   FuncInfo(new FunctionLoweringInfo(TLI)),
   CurDAG(new SelectionDAG(TLI, *FuncInfo)),
   SDL(new SelectionDAGLowering(*CurDAG, TLI, *FuncInfo, OL)),
@@ -292,12 +291,9 @@ void SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addRequired<GCModuleInfo>();
   AU.addRequired<DwarfWriter>();
   AU.setPreservesAll();
-  MachineFunctionPass::getAnalysisUsage(AU);
 }
 
-bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
-  Function &Fn = *mf.getFunction();
-
+bool SelectionDAGISel::runOnFunction(Function &Fn) {
   // Do some sanity-checking on the command-line options.
   assert((!EnableFastISelVerbose || EnableFastISel) &&
          "-fast-isel-verbose requires -fast-isel");
@@ -309,11 +305,12 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
   if (Fn.hasAvailableExternallyLinkage())
     return false;
 
+
   // Get alias analysis for load/store combining.
   AA = &getAnalysis<AliasAnalysis>();
 
   TargetMachine &TM = TLI.getTargetMachine();
-  MF = &mf;
+  MF = &MachineFunction::construct(&Fn, TM);
   const TargetInstrInfo &TII = *TM.getInstrInfo();
   const TargetRegisterInfo &TRI = *TM.getRegisterInfo();
 

lib/Target/CellSPU/SPUISelDAGToDAG.cpp

@@ -253,10 +253,10 @@ namespace {
       SPUtli(*tm.getTargetLowering())
     { }
 
-    virtual bool runOnMachineFunction(MachineFunction &MF) {
+    virtual bool runOnFunction(Function &Fn) {
       // Make sure we re-emit a set of the global base reg if necessary
       GlobalBaseReg = 0;
-      SelectionDAGISel::runOnMachineFunction(MF);
+      SelectionDAGISel::runOnFunction(Fn);
       return true;
     }
 

lib/Target/PowerPC/PPCISelDAGToDAG.cpp

@@ -20,7 +20,6 @@
 #include "PPCHazardRecognizers.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFunctionAnalysis.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "llvm/CodeGen/SelectionDAGISel.h"
@@ -52,12 +51,17 @@ namespace {
         PPCLowering(*TM.getTargetLowering()),
         PPCSubTarget(*TM.getSubtargetImpl()) {}
     
-    virtual bool runOnMachineFunction(MachineFunction &MF) {
+    virtual bool runOnFunction(Function &Fn) {
+      // Do not codegen any 'available_externally' functions at all, they have
+      // definitions outside the translation unit.
+      if (Fn.hasAvailableExternallyLinkage())
+        return false;
+
       // Make sure we re-emit a set of the global base reg if necessary
       GlobalBaseReg = 0;
-      SelectionDAGISel::runOnMachineFunction(MF);
+      SelectionDAGISel::runOnFunction(Fn);
       
-      InsertVRSaveCode(MF);
+      InsertVRSaveCode(Fn);
       return true;
     }
    
@@ -177,7 +181,7 @@ namespace {
     /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
     virtual void InstructionSelect();
     
-    void InsertVRSaveCode(MachineFunction &MF);
+    void InsertVRSaveCode(Function &Fn);
 
     virtual const char *getPassName() const {
       return "PowerPC DAG->DAG Pattern Instruction Selection";
@@ -214,12 +218,13 @@ void PPCDAGToDAGISel::InstructionSelect() {
 /// InsertVRSaveCode - Once the entire function has been instruction selected,
 /// all virtual registers are created and all machine instructions are built,
 /// check to see if we need to save/restore VRSAVE.  If so, do it.
-void PPCDAGToDAGISel::InsertVRSaveCode(MachineFunction &Fn) {
+void PPCDAGToDAGISel::InsertVRSaveCode(Function &F) {
   // Check to see if this function uses vector registers, which means we have to
   // save and restore the VRSAVE register and update it with the regs we use.  
   //
   // In this case, there will be virtual registers of vector type type created
   // by the scheduler.  Detect them now.
+  MachineFunction &Fn = MachineFunction::get(&F);
   bool HasVectorVReg = false;
   for (unsigned i = TargetRegisterInfo::FirstVirtualRegister, 
        e = RegInfo->getLastVirtReg()+1; i != e; ++i)