Add plumbing for the `linker_private' linkage type. This type is meant for

"private" symbols which the assember shouldn't strip, but which the linker may
remove after evaluation. This is mostly useful for Objective-C metadata.

This is plumbing, so we don't have a use of it yet. More to come, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76385 91177308-0d34-0410-b5e6-96231b3b80d8

14 files changed, 38 insertions, 8 deletions

diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index e561929af5..08c664880c 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -93,12 +93,15 @@ namespace {
       void Init(const std::string &GV, Mangler *Mang) {
         // Already initialized.
         if (!Stub.empty()) return;
-        Stub = Mang->makeNameProper(GV+"$stub", true);
-        LazyPtr = Mang->makeNameProper(GV+"$lazy_ptr", true);
-        SLP = Mang->makeNameProper(GV+"$slp", true);
-        SCV = Mang->makeNameProper(GV+"$scv", true);
+        Stub = Mang->makeNameProper(GV + "$stub",
+                                    Mangler::PrivatePrefixTy);
+        LazyPtr = Mang->makeNameProper(GV + "$lazy_ptr",
+                                       Mangler::PrivatePrefixTy);
+        SLP = Mang->makeNameProper(GV + "$slp",
+                                   Mangler::PrivatePrefixTy);
+        SCV = Mang->makeNameProper(GV + "$scv",
+                                   Mangler::PrivatePrefixTy);
       }
-      
     };
     
     /// FnStubs - Keeps the set of external function GlobalAddresses that the
@@ -256,6 +259,7 @@ bool ARMAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   switch (F->getLinkage()) {
   default: llvm_unreachable("Unknown linkage type!");
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
   case Function::InternalLinkage:
     SwitchToTextSection("\t.text", F);
     break;
@@ -1184,6 +1188,7 @@ void ARMAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
     O << "\t.globl " << name << "\n";
     // FALL THROUGH
    case GlobalValue::PrivateLinkage:
+   case GlobalValue::LinkerPrivateLinkage:
    case GlobalValue::InternalLinkage:
     break;
    default:
diff --git a/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp b/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp
index b772c14892..ce07225030 100644
--- a/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp
+++ b/lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp
@@ -157,6 +157,7 @@ bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   default: llvm_unreachable("Unknown linkage type!");
   case Function::InternalLinkage:  // Symbols default to internal.
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
     break;
    case Function::ExternalLinkage:
      O << "\t.globl " << CurrentFnName << "\n";
@@ -245,6 +246,7 @@ void AlphaAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
       break;
     case GlobalValue::InternalLinkage:
     case GlobalValue::PrivateLinkage:
+    case GlobalValue::LinkerPrivateLinkage:
       break;
     default:
       llvm_unreachable("Unknown linkage type!");
diff --git a/lib/Target/CellSPU/AsmPrinter/SPUAsmPrinter.cpp b/lib/Target/CellSPU/AsmPrinter/SPUAsmPrinter.cpp
index 3c67718215..59e5c6e645 100644
--- a/lib/Target/CellSPU/AsmPrinter/SPUAsmPrinter.cpp
+++ b/lib/Target/CellSPU/AsmPrinter/SPUAsmPrinter.cpp
@@ -437,6 +437,7 @@ LinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF)
   switch (F->getLinkage()) {
   default: llvm_unreachable("Unknown linkage type!");
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
   case Function::InternalLinkage:  // Symbols default to internal.
     break;
   case Function::ExternalLinkage:
@@ -571,6 +572,7 @@ void LinuxAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
       << "\t.type " << name << ", @object\n";
     // FALL THROUGH
    case GlobalValue::PrivateLinkage:
+   case GlobalValue::LinkerPrivateLinkage:
    case GlobalValue::InternalLinkage:
     break;
    default:
diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index d232a55cd7..71af8a9041 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -288,6 +288,8 @@ namespace {
       Out << "GlobalValue::InternalLinkage"; break;
     case GlobalValue::PrivateLinkage:
       Out << "GlobalValue::PrivateLinkage"; break;
+    case GlobalValue::LinkerPrivateLinkage:
+      Out << "GlobalValue::LinkerPrivateLinkage"; break;
     case GlobalValue::AvailableExternallyLinkage:
       Out << "GlobalValue::AvailableExternallyLinkage "; break;
     case GlobalValue::LinkOnceAnyLinkage:
diff --git a/lib/Target/ELFTargetAsmInfo.cpp b/lib/Target/ELFTargetAsmInfo.cpp
index 752f4757dd..0338ba4285 100644
--- a/lib/Target/ELFTargetAsmInfo.cpp
+++ b/lib/Target/ELFTargetAsmInfo.cpp
@@ -77,6 +77,7 @@ ELFTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
     switch (F->getLinkage()) {
      default: llvm_unreachable("Unknown linkage type!");
      case Function::PrivateLinkage:
+     case Function::LinkerPrivateLinkage:
      case Function::InternalLinkage:
      case Function::DLLExportLinkage:
      case Function::ExternalLinkage:
diff --git a/lib/Target/IA64/AsmPrinter/IA64AsmPrinter.cpp b/lib/Target/IA64/AsmPrinter/IA64AsmPrinter.cpp
index c224c8a32c..dbf1b4c1ee 100644
--- a/lib/Target/IA64/AsmPrinter/IA64AsmPrinter.cpp
+++ b/lib/Target/IA64/AsmPrinter/IA64AsmPrinter.cpp
@@ -317,6 +317,7 @@ void IA64AsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
     // FALL THROUGH
    case GlobalValue::InternalLinkage:
    case GlobalValue::PrivateLinkage:
+   case GlobalValue::LinkerPrivateLinkage:
     break;
    case GlobalValue::GhostLinkage:
     llvm_unreachable("GhostLinkage cannot appear in IA64AsmPrinter!");
diff --git a/lib/Target/MSP430/MSP430AsmPrinter.cpp b/lib/Target/MSP430/MSP430AsmPrinter.cpp
index 2ff5eecbfd..49e2a2e08f 100644
--- a/lib/Target/MSP430/MSP430AsmPrinter.cpp
+++ b/lib/Target/MSP430/MSP430AsmPrinter.cpp
@@ -103,6 +103,7 @@ void MSP430AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
   default: llvm_unreachable("Unknown linkage type!");
   case Function::InternalLinkage:  // Symbols default to internal.
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
     break;
   case Function::ExternalLinkage:
     O << "\t.globl\t" << CurrentFnName << '\n';
diff --git a/lib/Target/Mips/AsmPrinter/MipsAsmPrinter.cpp b/lib/Target/Mips/AsmPrinter/MipsAsmPrinter.cpp
index abdd5a3d1d..36c1c044a5 100644
--- a/lib/Target/Mips/AsmPrinter/MipsAsmPrinter.cpp
+++ b/lib/Target/Mips/AsmPrinter/MipsAsmPrinter.cpp
@@ -538,6 +538,7 @@ printModuleLevelGV(const GlobalVariable* GVar) {
     O << TAI->getGlobalDirective() << name << '\n';
     // Fall Through
    case GlobalValue::PrivateLinkage:
+   case GlobalValue::LinkerPrivateLinkage:
    case GlobalValue::InternalLinkage:
     if (CVA && CVA->isCString())
       printSizeAndType = false;
diff --git a/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp b/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
index a3526ccfea..a4fcdf661b 100644
--- a/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
@@ -70,9 +70,12 @@ namespace {
       void Init(const std::string &GV, Mangler *Mang) {
         // Already initialized.
         if (!Stub.empty()) return;
-        Stub = Mang->makeNameProper(GV+"$stub", true);
-        LazyPtr = Mang->makeNameProper(GV+"$lazy_ptr", true);
-        AnonSymbol = Mang->makeNameProper(GV+"$stub$tmp", true);
+        Stub = Mang->makeNameProper(GV + "$stub",
+                                    Mangler::PrivatePrefixTy);
+        LazyPtr = Mang->makeNameProper(GV + "$lazy_ptr",
+                                       Mangler::PrivatePrefixTy);
+        AnonSymbol = Mang->makeNameProper(GV + "$stub$tmp",
+                                          Mangler::PrivatePrefixTy);
       }
     };
     
@@ -594,6 +597,7 @@ bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   switch (F->getLinkage()) {
   default: llvm_unreachable("Unknown linkage type!");
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
   case Function::InternalLinkage:  // Symbols default to internal.
     break;
   case Function::ExternalLinkage:
@@ -725,6 +729,7 @@ void PPCLinuxAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
     // FALL THROUGH
    case GlobalValue::InternalLinkage:
    case GlobalValue::PrivateLinkage:
+   case GlobalValue::LinkerPrivateLinkage:
     break;
    default:
     llvm_unreachable("Unknown linkage type!");
@@ -771,6 +776,7 @@ bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   switch (F->getLinkage()) {
   default: llvm_unreachable("Unknown linkage type!");
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
   case Function::InternalLinkage:  // Symbols default to internal.
     break;
   case Function::ExternalLinkage:
@@ -954,6 +960,7 @@ void PPCDarwinAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
     // FALL THROUGH
    case GlobalValue::InternalLinkage:
    case GlobalValue::PrivateLinkage:
+   case GlobalValue::LinkerPrivateLinkage:
     break;
    default:
     llvm_unreachable("Unknown linkage type!");
diff --git a/lib/Target/Sparc/AsmPrinter/SparcAsmPrinter.cpp b/lib/Target/Sparc/AsmPrinter/SparcAsmPrinter.cpp
index f6a5e0b436..3247cecc97 100644
--- a/lib/Target/Sparc/AsmPrinter/SparcAsmPrinter.cpp
+++ b/lib/Target/Sparc/AsmPrinter/SparcAsmPrinter.cpp
@@ -294,6 +294,7 @@ void SparcAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
     O << TAI->getGlobalDirective() << name << '\n';
     // FALL THROUGH
    case GlobalValue::PrivateLinkage:
+   case GlobalValue::LinkerPrivateLinkage:
    case GlobalValue::InternalLinkage:
     break;
    case GlobalValue::GhostLinkage:
diff --git a/lib/Target/SystemZ/AsmPrinter/SystemZAsmPrinter.cpp b/lib/Target/SystemZ/AsmPrinter/SystemZAsmPrinter.cpp
index 1bb4d42590..7dd6fcc304 100644
--- a/lib/Target/SystemZ/AsmPrinter/SystemZAsmPrinter.cpp
+++ b/lib/Target/SystemZ/AsmPrinter/SystemZAsmPrinter.cpp
@@ -118,6 +118,7 @@ void SystemZAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
   default: assert(0 && "Unknown linkage type!");
   case Function::InternalLinkage:  // Symbols default to internal.
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
     break;
   case Function::ExternalLinkage:
     O << "\t.globl\t" << CurrentFnName << '\n';
@@ -396,6 +397,7 @@ void SystemZAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
     O << "\t.globl " << name << '\n';
     // FALL THROUGH
   case GlobalValue::PrivateLinkage:
+  case GlobalValue::LinkerPrivateLinkage:
   case GlobalValue::InternalLinkage:
      break;
   default:
diff --git a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
index 2cec3736a3..4cb447b630 100644
--- a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
@@ -171,6 +171,7 @@ void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
   default: llvm_unreachable("Unknown linkage type!");
   case Function::InternalLinkage:  // Symbols default to internal.
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
     EmitAlignment(FnAlign, F);
     break;
   case Function::DLLExportLinkage:
@@ -877,6 +878,7 @@ void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
     O << "\t.globl " << name << '\n';
     // FALL THROUGH
   case GlobalValue::PrivateLinkage:
+  case GlobalValue::LinkerPrivateLinkage:
   case GlobalValue::InternalLinkage:
      break;
   default:
diff --git a/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp
index 4b88841642..3c2722ea02 100644
--- a/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.cpp
@@ -146,6 +146,7 @@ bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   switch (F->getLinkage()) {
   default: llvm_unreachable("Unsupported linkage type!");
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
   case Function::InternalLinkage:
     EmitAlignment(FnAlign);
     break;
diff --git a/lib/Target/XCore/XCoreAsmPrinter.cpp b/lib/Target/XCore/XCoreAsmPrinter.cpp
index 218b21d093..6bb29b3ff9 100644
--- a/lib/Target/XCore/XCoreAsmPrinter.cpp
+++ b/lib/Target/XCore/XCoreAsmPrinter.cpp
@@ -172,6 +172,7 @@ emitGlobal(const GlobalVariable *GV)
       // FALL THROUGH
     case GlobalValue::InternalLinkage:
     case GlobalValue::PrivateLinkage:
+    case GlobalValue::LinkerPrivateLinkage:
       break;
     case GlobalValue::GhostLinkage:
       llvm_unreachable("Should not have any unmaterialized functions!");
@@ -228,6 +229,7 @@ emitFunctionStart(MachineFunction &MF)
   default: llvm_unreachable("Unknown linkage type!");
   case Function::InternalLinkage:  // Symbols default to internal.
   case Function::PrivateLinkage:
+  case Function::LinkerPrivateLinkage:
     break;
   case Function::ExternalLinkage:
     emitGlobalDirective(CurrentFnName);