hoist handling of external globals and special globals up to common code.

This makes a similar code dead in all the other targets, I'll clean it up
in a bit.

This also moves handling of lcomm up before acquisition of a section,
since lcomm never needs a section.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93851 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 44 insertions, 73 deletions

diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index 070c29a24d..b1c1f55f17 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -1167,13 +1167,6 @@ void ARMAsmPrinter::EmitStartOfAsmFile(Module &M) {
 void ARMAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
   const TargetData *TD = TM.getTargetData();
 
-  if (!GVar->hasInitializer())   // External global require no code
-    return;
-
-  // Check to see if this is a special global used by LLVM, if so, emit it.
-  if (EmitSpecialLLVMGlobal(GVar))
-    return;
-
   MCSymbol *GVarSym = GetGlobalValueSymbol(GVar);
   
   Constant *C = GVar->getInitializer();
@@ -1206,25 +1199,12 @@ void ARMAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
     return;
   }
   
-  const MCSection *TheSection =
-    getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
-  
-  // Handle the zerofill directive on darwin, which is a special form of BSS
-  // emission.
-  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
-    // .globl _foo
-    OutStreamer.EmitSymbolAttribute(GVarSym, MCStreamer::Global);
-    // .zerofill __DATA, __common, _foo, 400, 5
-    OutStreamer.EmitZerofill(TheSection, GVarSym, Size, 1 << Align);
-    return;
-  }
-  
   if (GVKind.isBSSLocal()) {
     if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
-
+    
     if (isDarwin) {
       O << MAI->getLCOMMDirective() << *GVarSym << ',' << Size
-        << ',' << Align;
+      << ',' << Align;
     } else if (MAI->getLCOMMDirective() != NULL) {
       O << MAI->getLCOMMDirective() << *GVarSym << "," << Size;
     } else {
@@ -1242,7 +1222,20 @@ void ARMAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
     O << "\n";
     return;
   }
-
+  
+  const MCSection *TheSection =
+    getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
+  
+  // Handle the zerofill directive on darwin, which is a special form of BSS
+  // emission.
+  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
+    // .globl _foo
+    OutStreamer.EmitSymbolAttribute(GVarSym, MCStreamer::Global);
+    // .zerofill __DATA, __common, _foo, 400, 5
+    OutStreamer.EmitZerofill(TheSection, GVarSym, Size, 1 << Align);
+    return;
+  }
+  
   OutStreamer.SwitchSection(TheSection);
 
   switch (GVar->getLinkage()) {
diff --git a/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp b/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
index a1c117dd04..6b8408f08a 100644
--- a/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
@@ -697,14 +697,6 @@ bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 
 void PPCLinuxAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
   const TargetData *TD = TM.getTargetData();
-
-  if (!GVar->hasInitializer())
-    return;   // External global require no code
-
-  // Check to see if this is a special global used by LLVM, if so, emit it.
-  if (EmitSpecialLLVMGlobal(GVar))
-    return;
-
   MCSymbol *GVarSym = GetGlobalValueSymbol(GVar);
 
   printVisibility(GVarSym, GVar->getVisibility());
@@ -929,13 +921,6 @@ void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
 void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
   const TargetData *TD = TM.getTargetData();
 
-  if (!GVar->hasInitializer())
-    return;   // External global require no code
-
-  // Check to see if this is a special global used by LLVM, if so, emit it.
-  if (EmitSpecialLLVMGlobal(GVar))
-    return;
-
   MCSymbol *GVarSym = GetGlobalValueSymbol(GVar);
   printVisibility(GVarSym, GVar->getVisibility());
 
@@ -963,6 +948,20 @@ void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
     return;
   }
   
+  if (GVKind.isBSSLocal()) {
+    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
+    
+    O << MAI->getLCOMMDirective() << *GVarSym << ',' << Size << ',' << Align;
+    
+    if (VerboseAsm) {
+      O << "\t\t" << MAI->getCommentString() << " '";
+      WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
+      O << "'";
+    }
+    O << '\n';
+    return;
+  }
+  
   const MCSection *TheSection =
     getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
   
@@ -976,20 +975,6 @@ void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
     return;
   }
   
-  if (GVKind.isBSSLocal()) {
-    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
-
-    O << MAI->getLCOMMDirective() << *GVarSym << ',' << Size << ',' << Align;
-    
-    if (VerboseAsm) {
-      O << "\t\t" << MAI->getCommentString() << " '";
-      WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
-      O << "'";
-    }
-    O << '\n';
-    return;
-  }
-
   OutStreamer.SwitchSection(TheSection);
 
   switch (GVar->getLinkage()) {
diff --git a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
index bdbb2946fa..22e2573c1c 100644
--- a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
@@ -647,13 +647,6 @@ void X86AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 }
 
 void X86AsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
-  if (!GVar->hasInitializer())
-    return;   // External global require no code
-  
-  // Check to see if this is a special global used by LLVM, if so, emit it.
-  if (EmitSpecialLLVMGlobal(GVar))
-    return;
-  
   const TargetData *TD = TM.getTargetData();
 
   MCSymbol *GVarSym = GetGlobalValueSymbol(GVar);
@@ -686,22 +679,9 @@ void X86AsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
     return;
   }
   
-  const MCSection *TheSection =
-    getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
-
-  // Handle the zerofill directive on darwin, which is a special form of BSS
-  // emission.
-  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
-    // .globl _foo
-    OutStreamer.EmitSymbolAttribute(GVarSym, MCStreamer::Global);
-    // .zerofill __DATA, __common, _foo, 400, 5
-    OutStreamer.EmitZerofill(TheSection, GVarSym, Size, 1 << Align);
-    return;
-  }
-
   if (GVKind.isBSSLocal()) {
     if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
-
+    
     if (const char *LComm = MAI->getLCOMMDirective()) {
       if (GVar->hasLocalLinkage()) {
         O << LComm << *GVarSym << ',' << Size;
@@ -723,6 +703,19 @@ void X86AsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
     O << '\n';
     return;
   }
+  
+  const MCSection *TheSection =
+    getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
+
+  // Handle the zerofill directive on darwin, which is a special form of BSS
+  // emission.
+  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
+    // .globl _foo
+    OutStreamer.EmitSymbolAttribute(GVarSym, MCStreamer::Global);
+    // .zerofill __DATA, __common, _foo, 400, 5
+    OutStreamer.EmitZerofill(TheSection, GVarSym, Size, 1 << Align);
+    return;
+  }
 
   OutStreamer.SwitchSection(TheSection);