[llvm] 7b9890e - [MC][ELF] Remove unneeded MCSymbol::setExternal calls

[Fangrui Song via llvm-commits]

Author: Fangrui Song
Date: 2020-12-20T21:26:36-08:00
New Revision: 7b9890e17e9e9be4d14845f3bfe52e1a06ab032a

URL: https://github.com/llvm/llvm-project/commit/7b9890e17e9e9be4d14845f3bfe52e1a06ab032a
DIFF: https://github.com/llvm/llvm-project/commit/7b9890e17e9e9be4d14845f3bfe52e1a06ab032a.diff

LOG: [MC][ELF] Remove unneeded MCSymbol::setExternal calls

ELF code uses symbol bindings and does not call isExternal().

Added: 
    

Modified: 
    llvm/include/llvm/MC/MCSymbol.h
    llvm/lib/MC/MCELFStreamer.cpp
    llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
    llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/include/llvm/MC/MCSymbol.h b/llvm/include/llvm/MC/MCSymbol.h
index a89de5dfa22f..a83781f5c586 100644
--- a/llvm/include/llvm/MC/MCSymbol.h
+++ b/llvm/include/llvm/MC/MCSymbol.h
@@ -94,7 +94,8 @@ class MCSymbol {
 
   mutable unsigned IsRegistered : 1;
 
-  /// This symbol is visible outside this translation unit.
+  /// True if this symbol is visible outside this translation unit. Note: ELF
+  /// uses binding instead of this bit.
   mutable unsigned IsExternal : 1;
 
   /// This symbol is private extern.

diff  --git a/llvm/lib/MC/MCELFStreamer.cpp b/llvm/lib/MC/MCELFStreamer.cpp
index 17beca1c3556..db45aef7d506 100644
--- a/llvm/lib/MC/MCELFStreamer.cpp
+++ b/llvm/lib/MC/MCELFStreamer.cpp
@@ -221,7 +221,6 @@ bool MCELFStreamer::emitSymbolAttribute(MCSymbol *S, MCSymbolAttr Attribute) {
   case MCSA_ELF_TypeGnuUniqueObject:
     Symbol->setType(CombineSymbolTypes(Symbol->getType(), ELF::STT_OBJECT));
     Symbol->setBinding(ELF::STB_GNU_UNIQUE);
-    Symbol->setExternal(true);
     break;
 
   case MCSA_Global:
@@ -233,7 +232,6 @@ bool MCELFStreamer::emitSymbolAttribute(MCSymbol *S, MCSymbolAttr Attribute) {
                                Symbol->getName() +
                                    " changed binding to STB_GLOBAL");
     Symbol->setBinding(ELF::STB_GLOBAL);
-    Symbol->setExternal(true);
     break;
 
   case MCSA_WeakReference:
@@ -244,7 +242,6 @@ bool MCELFStreamer::emitSymbolAttribute(MCSymbol *S, MCSymbolAttr Attribute) {
       getContext().reportWarning(
           getStartTokLoc(), Symbol->getName() + " changed binding to STB_WEAK");
     Symbol->setBinding(ELF::STB_WEAK);
-    Symbol->setExternal(true);
     break;
 
   case MCSA_Local:
@@ -253,7 +250,6 @@ bool MCELFStreamer::emitSymbolAttribute(MCSymbol *S, MCSymbolAttr Attribute) {
                                Symbol->getName() +
                                    " changed binding to STB_LOCAL");
     Symbol->setBinding(ELF::STB_LOCAL);
-    Symbol->setExternal(false);
     break;
 
   case MCSA_ELF_TypeFunction:
@@ -308,10 +304,8 @@ void MCELFStreamer::emitCommonSymbol(MCSymbol *S, uint64_t Size,
   auto *Symbol = cast<MCSymbolELF>(S);
   getAssembler().registerSymbol(*Symbol);
 
-  if (!Symbol->isBindingSet()) {
+  if (!Symbol->isBindingSet())
     Symbol->setBinding(ELF::STB_GLOBAL);
-    Symbol->setExternal(true);
-  }
 
   Symbol->setType(ELF::STT_OBJECT);
 
@@ -352,7 +346,6 @@ void MCELFStreamer::emitLocalCommonSymbol(MCSymbol *S, uint64_t Size,
   // FIXME: Should this be caught and done earlier?
   getAssembler().registerSymbol(*Symbol);
   Symbol->setBinding(ELF::STB_LOCAL);
-  Symbol->setExternal(false);
   emitCommonSymbol(Symbol, Size, ByteAlignment);
 }
 
@@ -499,10 +492,8 @@ void MCELFStreamer::finalizeCGProfileEntry(const MCSymbolRefExpr *&SRE) {
   // Not a temporary, referece it as a weak undefined.
   bool Created;
   getAssembler().registerSymbol(*S, &Created);
-  if (Created) {
+  if (Created)
     cast<MCSymbolELF>(S)->setBinding(ELF::STB_WEAK);
-    cast<MCSymbolELF>(S)->setExternal(true);
-  }
 }
 
 void MCELFStreamer::finalizeCGProfile() {

diff  --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
index 876741d6c343..07ca5c29f0ec 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
@@ -644,7 +644,6 @@ class ARMELFStreamer : public MCELFStreamer {
 
     Symbol->setType(ELF::STT_NOTYPE);
     Symbol->setBinding(ELF::STB_LOCAL);
-    Symbol->setExternal(false);
   }
 
   void EmitMappingSymbol(StringRef Name, SMLoc Loc, MCFragment *F,
@@ -654,7 +653,6 @@ class ARMELFStreamer : public MCELFStreamer {
     emitLabelAtPos(Symbol, Loc, F, Offset);
     Symbol->setType(ELF::STT_NOTYPE);
     Symbol->setBinding(ELF::STB_LOCAL);
-    Symbol->setExternal(false);
   }
 
   void emitThumbFunc(MCSymbol *Func) override {

diff  --git a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
index 00f319fc37e1..8780c602a269 100644
--- a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
@@ -205,10 +205,8 @@ void SparcMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
     MCSymbol *Symbol = Asm.getContext().getOrCreateSymbol("__tls_get_addr");
     Asm.registerSymbol(*Symbol);
     auto ELFSymbol = cast<MCSymbolELF>(Symbol);
-    if (!ELFSymbol->isBindingSet()) {
+    if (!ELFSymbol->isBindingSet())
       ELFSymbol->setBinding(ELF::STB_GLOBAL);
-      ELFSymbol->setExternal(true);
-    }
     LLVM_FALLTHROUGH;
   }
   case VK_Sparc_TLS_GD_HI22: