Make the need-stub variables accurate and consistent. In the case of

MachineRelocations, "stub" always refers to a far-call stub or a
load-a-faraway-global stub, so this patch adds "Far" to the term. (Other stubs
are used for lazy compilation and dlsym address replacement.) The variable was
also inconsistent between the positive and negative sense, and the positive
sense ("NeedStub") was more demanding than is accurate (since a nearby-enough
function can be called directly even if the platform often requires a stub).
Since the negative sense causes double-negatives, I switched to
"MayNeedFarStub" globally.

llvm-svn: 86363

3 files changed, 32 insertions, 33 deletions

diff --git a/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp b/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp
index bc959d8b2be..8c831a59981 100644
--- a/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -491,9 +491,9 @@ namespace {
     JITMemoryManager *getMemMgr() const { return MemMgr; }
 
   private:
-    void *getPointerToGlobal(GlobalValue *GV, void *Reference, bool NoNeedStub);
-    void *getPointerToGVIndirectSym(GlobalValue *V, void *Reference,
-                                    bool NoNeedStub);
+    void *getPointerToGlobal(GlobalValue *GV, void *Reference,
+                             bool MayNeedFarStub);
+    void *getPointerToGVIndirectSym(GlobalValue *V, void *Reference);
     unsigned addSizeOfGlobal(const GlobalVariable *GV, unsigned Size);
     unsigned addSizeOfGlobalsInConstantVal(const Constant *C, unsigned Size);
     unsigned addSizeOfGlobalsInInitializer(const Constant *Init, unsigned Size);
@@ -737,7 +737,7 @@ void *JITResolver::JITCompilerFn(void *Stub) {
 // JITEmitter code.
 //
 void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
-                                     bool DoesntNeedStub) {
+                                     bool MayNeedFarStub) {
   if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
     return TheJIT->getOrEmitGlobalVariable(GV);
 
@@ -747,7 +747,7 @@ void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
   // If we have already compiled the function, return a pointer to its body.
   Function *F = cast<Function>(V);
   void *ResultPtr;
-  if (!DoesntNeedStub) {
+  if (MayNeedFarStub) {
     // Return the function stub if it's already created.
     ResultPtr = Resolver.getFunctionStubIfAvailable(F);
     if (ResultPtr)
@@ -761,14 +761,14 @@ void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
   // 'compile' it, which really just adds it to the map.  In dlsym mode, 
   // external functions are forced through a stub, regardless of reloc type.
   if (F->isDeclaration() && !F->hasNotBeenReadFromBitcode() &&
-      DoesntNeedStub && !TheJIT->areDlsymStubsEnabled())
+      !MayNeedFarStub && !TheJIT->areDlsymStubsEnabled())
     return TheJIT->getPointerToFunction(F);
 
   // Okay, the function has not been compiled yet, if the target callback
   // mechanism is capable of rewriting the instruction directly, prefer to do
   // that instead of emitting a stub.  This uses the lazy resolver, so is not
   // legal if lazy compilation is disabled.
-  if (DoesntNeedStub && TheJIT->isCompilingLazily())
+  if (!MayNeedFarStub && TheJIT->isCompilingLazily())
     return Resolver.AddCallbackAtLocation(F, Reference);
 
   // Otherwise, we have to emit a stub.
@@ -784,11 +784,10 @@ void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
   return StubAddr;
 }
 
-void *JITEmitter::getPointerToGVIndirectSym(GlobalValue *V, void *Reference,
-                                            bool NoNeedStub) {
+void *JITEmitter::getPointerToGVIndirectSym(GlobalValue *V, void *Reference) {
   // Make sure GV is emitted first, and create a stub containing the fully
   // resolved address.
-  void *GVAddress = getPointerToGlobal(V, Reference, true);
+  void *GVAddress = getPointerToGlobal(V, Reference, false);
   void *StubAddr = Resolver.getGlobalValueIndirectSym(V, GVAddress);
   
   // Add the stub to the current function's list of referenced stubs, so we can
@@ -1112,7 +1111,7 @@ bool JITEmitter::finishFunction(MachineFunction &F) {
                        << ResultPtr << "]\n"); 
 
           // If the target REALLY wants a stub for this function, emit it now.
-          if (!MR.doesntNeedStub()) {
+          if (MR.mayNeedFarStub()) {
             if (!TheJIT->areDlsymStubsEnabled()) {
               ResultPtr = Resolver.getExternalFunctionStub(ResultPtr);
             } else {
@@ -1127,11 +1126,10 @@ bool JITEmitter::finishFunction(MachineFunction &F) {
         } else if (MR.isGlobalValue()) {
           ResultPtr = getPointerToGlobal(MR.getGlobalValue(),
                                          BufferBegin+MR.getMachineCodeOffset(),
-                                         MR.doesntNeedStub());
+                                         MR.mayNeedFarStub());
         } else if (MR.isIndirectSymbol()) {
-          ResultPtr = getPointerToGVIndirectSym(MR.getGlobalValue(),
-                                          BufferBegin+MR.getMachineCodeOffset(),
-                                          MR.doesntNeedStub());
+          ResultPtr = getPointerToGVIndirectSym(
+              MR.getGlobalValue(), BufferBegin+MR.getMachineCodeOffset());
         } else if (MR.isBasicBlock()) {
           ResultPtr = (void*)getMachineBasicBlockAddress(MR.getBasicBlock());
         } else if (MR.isConstantPoolIndex()) {
diff --git a/llvm/lib/Target/ARM/ARMCodeEmitter.cpp b/llvm/lib/Target/ARM/ARMCodeEmitter.cpp
index 13cf6765c27..766acff797e 100644
--- a/llvm/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/llvm/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -168,7 +168,8 @@ namespace {
     /// Routines that handle operands which add machine relocations which are
     /// fixed up by the relocation stage.
     void emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
-                           bool NeedStub,  bool Indirect, intptr_t ACPV = 0);
+                           bool MayNeedFarStub,  bool Indirect,
+                           intptr_t ACPV = 0);
     void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
     void emitConstPoolAddress(unsigned CPI, unsigned Reloc);
     void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc);
@@ -277,13 +278,13 @@ unsigned Emitter<CodeEmitter>::getMachineOpValue(const MachineInstr &MI,
 ///
 template<class CodeEmitter>
 void Emitter<CodeEmitter>::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
-                                             bool NeedStub, bool Indirect,
+                                             bool MayNeedFarStub, bool Indirect,
                                              intptr_t ACPV) {
   MachineRelocation MR = Indirect
     ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
-                                           GV, ACPV, NeedStub)
+                                           GV, ACPV, MayNeedFarStub)
     : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
-                               GV, ACPV, NeedStub);
+                               GV, ACPV, MayNeedFarStub);
   MCE.addRelocation(MR);
 }
 
diff --git a/llvm/lib/Target/X86/X86CodeEmitter.cpp b/llvm/lib/Target/X86/X86CodeEmitter.cpp
index a0bded3aea5..ab49b9eba36 100644
--- a/llvm/lib/Target/X86/X86CodeEmitter.cpp
+++ b/llvm/lib/Target/X86/X86CodeEmitter.cpp
@@ -82,7 +82,7 @@ namespace {
     void emitPCRelativeBlockAddress(MachineBasicBlock *MBB);
     void emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
                            intptr_t Disp = 0, intptr_t PCAdj = 0,
-                           bool NeedStub = false, bool Indirect = false);
+                           bool MayNeedFarStub = false, bool Indirect = false);
     void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
     void emitConstPoolAddress(unsigned CPI, unsigned Reloc, intptr_t Disp = 0,
                               intptr_t PCAdj = 0);
@@ -176,7 +176,7 @@ template<class CodeEmitter>
 void Emitter<CodeEmitter>::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
                                 intptr_t Disp /* = 0 */,
                                 intptr_t PCAdj /* = 0 */,
-                                bool NeedStub /* = false */,
+                                bool MayNeedFarStub /* = false */,
                                 bool Indirect /* = false */) {
   intptr_t RelocCST = Disp;
   if (Reloc == X86::reloc_picrel_word)
@@ -185,9 +185,9 @@ void Emitter<CodeEmitter>::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
     RelocCST = PCAdj;
   MachineRelocation MR = Indirect
     ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
-                                           GV, RelocCST, NeedStub)
+                                           GV, RelocCST, MayNeedFarStub)
     : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
-                               GV, RelocCST, NeedStub);
+                               GV, RelocCST, MayNeedFarStub);
   MCE.addRelocation(MR);
   // The relocated value will be added to the displacement
   if (Reloc == X86::reloc_absolute_dword)
@@ -333,10 +333,10 @@ void Emitter<CodeEmitter>::emitDisplacementField(const MachineOperand *RelocOp,
     // do it, otherwise fallback to absolute (this is determined by IsPCRel). 
     //  89 05 00 00 00 00     mov    %eax,0(%rip)  # PC-relative
     //  89 04 25 00 00 00 00  mov    %eax,0x0      # Absolute
-    bool NeedStub = isa<Function>(RelocOp->getGlobal());
+    bool MayNeedFarStub = isa<Function>(RelocOp->getGlobal());
     bool Indirect = gvNeedsNonLazyPtr(*RelocOp, TM);
     emitGlobalAddress(RelocOp->getGlobal(), RelocType, RelocOp->getOffset(),
-                      Adj, NeedStub, Indirect);
+                      Adj, MayNeedFarStub, Indirect);
   } else if (RelocOp->isSymbol()) {
     emitExternalSymbolAddress(RelocOp->getSymbolName(), RelocType);
   } else if (RelocOp->isCPI()) {
@@ -634,13 +634,13 @@ void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
     
     if (MO.isGlobal()) {
       // Assume undefined functions may be outside the Small codespace.
-      bool NeedStub = 
+      bool MayNeedFarStub = 
         (Is64BitMode && 
             (TM.getCodeModel() == CodeModel::Large ||
              TM.getSubtarget<X86Subtarget>().isTargetDarwin())) ||
         Opcode == X86::TAILJMPd;
       emitGlobalAddress(MO.getGlobal(), X86::reloc_pcrel_word,
-                        MO.getOffset(), 0, NeedStub);
+                        MO.getOffset(), 0, MayNeedFarStub);
       break;
     }
     
@@ -681,10 +681,10 @@ void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
     if (Opcode == X86::MOV64ri)
       rt = X86::reloc_absolute_dword;  // FIXME: add X86II flag?
     if (MO1.isGlobal()) {
-      bool NeedStub = isa<Function>(MO1.getGlobal());
+      bool MayNeedFarStub = isa<Function>(MO1.getGlobal());
       bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
       emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
-                        NeedStub, Indirect);
+                        MayNeedFarStub, Indirect);
     } else if (MO1.isSymbol())
       emitExternalSymbolAddress(MO1.getSymbolName(), rt);
     else if (MO1.isCPI())
@@ -790,10 +790,10 @@ void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
     if (Opcode == X86::MOV64ri32)
       rt = X86::reloc_absolute_word_sext;  // FIXME: add X86II flag?
     if (MO1.isGlobal()) {
-      bool NeedStub = isa<Function>(MO1.getGlobal());
+      bool MayNeedFarStub = isa<Function>(MO1.getGlobal());
       bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
       emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
-                        NeedStub, Indirect);
+                        MayNeedFarStub, Indirect);
     } else if (MO1.isSymbol())
       emitExternalSymbolAddress(MO1.getSymbolName(), rt);
     else if (MO1.isCPI())
@@ -831,10 +831,10 @@ void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
     if (Opcode == X86::MOV64mi32)
       rt = X86::reloc_absolute_word_sext;  // FIXME: add X86II flag?
     if (MO.isGlobal()) {
-      bool NeedStub = isa<Function>(MO.getGlobal());
+      bool MayNeedFarStub = isa<Function>(MO.getGlobal());
       bool Indirect = gvNeedsNonLazyPtr(MO, TM);
       emitGlobalAddress(MO.getGlobal(), rt, MO.getOffset(), 0,
-                        NeedStub, Indirect);
+                        MayNeedFarStub, Indirect);
     } else if (MO.isSymbol())
       emitExternalSymbolAddress(MO.getSymbolName(), rt);
     else if (MO.isCPI())