MCSymbol: Avoid isExported/setExported

The next change will move it to MCSymbol{COFF,MachO,Wasm} to make it
clear that other object file formats (e.g. ELF) do not use this field.

Author: MaskRay

llvm/lib/MC/MCParser/AsmParser.cpp

@@ -1864,11 +1864,13 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info,
       Lex();
     }
 
-    if (MAI.hasSubsectionsViaSymbols() && CFIStartProcLoc &&
-        Sym->isExternal() && !static_cast<MCSymbolMachO *>(Sym)->isAltEntry())
-      return Error(StartTokLoc, "non-private labels cannot appear between "
-                                ".cfi_startproc / .cfi_endproc pairs") &&
-             Error(*CFIStartProcLoc, "previous .cfi_startproc was here");
+    if (MAI.isMachO() && CFIStartProcLoc) {
+      auto *SymM = static_cast<MCSymbolMachO *>(Sym);
+      if (SymM->isExternal() && !SymM->isAltEntry())
+        return Error(StartTokLoc, "non-private labels cannot appear between "
+                                  ".cfi_startproc / .cfi_endproc pairs") &&
+               Error(*CFIStartProcLoc, "previous .cfi_startproc was here");
+    }
 
     if (discardLTOSymbol(IDVal))
       return false;

llvm/lib/MC/MCParser/MasmParser.cpp

@@ -39,7 +39,7 @@
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSubtargetInfo.h"
-#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCSymbolCOFF.h"
 #include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
@@ -3009,8 +3009,8 @@ bool MasmParser::parseDirectiveEquate(StringRef IDVal, StringRef Name,
     return false;
   }
 
-  MCSymbol *Sym = getContext().getOrCreateSymbol(Var.Name);
-
+  auto *Sym =
+      static_cast<MCSymbolCOFF *>(getContext().getOrCreateSymbol(Var.Name));
   const MCConstantExpr *PrevValue =
       Sym->isVariable()
           ? dyn_cast_or_null<MCConstantExpr>(Sym->getVariableValue())
@@ -4521,7 +4521,8 @@ bool MasmParser::parseDirectiveExtern() {
       KnownType[Name.lower()] = Type;
     }
 
-    MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
+    auto *Sym =
+        static_cast<MCSymbolCOFF *>(getContext().getOrCreateSymbol(Name));
     Sym->setExternal(true);
     getStreamer().emitSymbolAttribute(Sym, MCSA_Extern);
 

llvm/lib/MC/WasmObjectWriter.cpp

@@ -1561,7 +1561,7 @@ uint64_t WasmObjectWriter::writeOneObject(MCAssembler &Asm,
                  << toString(WS.getType().value_or(wasm::WASM_SYMBOL_TYPE_DATA))
                  << " '" << S << "'"
                  << " isDefined=" << S.isDefined() << " isExternal="
-                 << S.isExternal() << " isTemporary=" << S.isTemporary()
+                 << WS.isExternal() << " isTemporary=" << S.isTemporary()
                  << " isWeak=" << WS.isWeak() << " isHidden=" << WS.isHidden()
                  << " isVariable=" << WS.isVariable() << "\n");