Move all flags logic to MCSymbolMachO.

Also delete the now unused MCMachOSymbolFlags.h header as the only enum in there was moved to MCSymbolMachO.

Similarly to ELF and COFF, manipulating the flags is now done via helpers instead of spread
throughout the codebase.

Reviewed by Rafael Espíndola.

llvm-svn: 239316

2 files changed, 21 insertions, 35 deletions

diff --git a/llvm/lib/MC/MCMachOStreamer.cpp b/llvm/lib/MC/MCMachOStreamer.cpp
index dfa7d24edae..0cbe9744776 100644
--- a/llvm/lib/MC/MCMachOStreamer.cpp
+++ b/llvm/lib/MC/MCMachOStreamer.cpp
@@ -23,7 +23,7 @@
 #include "llvm/MC/MCObjectStreamer.h"
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCSectionMachO.h"
-#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCSymbolMachO.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/TargetRegistry.h"
@@ -172,7 +172,7 @@ void MCMachOStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
   getAssembler().registerSymbol(*Symbol);
   if (Symbol->isExternal())
     EmitSymbolAttribute(EHSymbol, MCSA_Global);
-  if (Symbol->getFlags() & SF_WeakDefinition)
+  if (cast<MCSymbolMachO>(Symbol)->isWeakDefinition())
     EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
   if (Symbol->isPrivateExtern())
     EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
@@ -197,7 +197,7 @@ void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
   //
   // FIXME: Cleanup this code, these bits should be emitted based on semantic
   // properties, not on the order of definition, etc.
-  Symbol->setFlags(Symbol->getFlags() & ~SF_ReferenceTypeMask);
+  cast<MCSymbolMachO>(Symbol)->clearReferenceType();
 }
 
 void MCMachOStreamer::EmitDataRegion(DataRegionData::KindTy Kind) {
@@ -272,10 +272,13 @@ void MCMachOStreamer::EmitThumbFunc(MCSymbol *Symbol) {
   // Remember that the function is a thumb function. Fixup and relocation
   // values will need adjusted.
   getAssembler().setIsThumbFunc(Symbol);
+  cast<MCSymbolMachO>(Symbol)->setThumbFunc();
 }
 
-bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Sym,
                                           MCSymbolAttr Attribute) {
+  MCSymbolMachO *Symbol = cast<MCSymbolMachO>(Sym);
+
   // Indirect symbols are handled differently, to match how 'as' handles
   // them. This makes writing matching .o files easier.
   if (Attribute == MCSA_IndirectSymbol) {
@@ -324,25 +327,25 @@ bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
     //
     // FIXME: Cleanup this code, these bits should be emitted based on semantic
     // properties, not on the order of definition, etc.
-    Symbol->setFlags(Symbol->getFlags() & ~SF_ReferenceTypeUndefinedLazy);
+    Symbol->setReferenceTypeUndefinedLazy(false);
     break;
 
   case MCSA_LazyReference:
     // FIXME: This requires -dynamic.
-    Symbol->setFlags(Symbol->getFlags() | SF_NoDeadStrip);
+    Symbol->setNoDeadStrip();
     if (Symbol->isUndefined())
-      Symbol->setFlags(Symbol->getFlags() | SF_ReferenceTypeUndefinedLazy);
+      Symbol->setReferenceTypeUndefinedLazy(true);
     break;
 
     // Since .reference sets the no dead strip bit, it is equivalent to
     // .no_dead_strip in practice.
   case MCSA_Reference:
   case MCSA_NoDeadStrip:
-    Symbol->setFlags(Symbol->getFlags() | SF_NoDeadStrip);
+    Symbol->setNoDeadStrip();
     break;
 
   case MCSA_SymbolResolver:
-    Symbol->setFlags(Symbol->getFlags() | SF_SymbolResolver);
+    Symbol->setSymbolResolver();
     break;
 
   case MCSA_PrivateExtern:
@@ -353,17 +356,18 @@ bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
   case MCSA_WeakReference:
     // FIXME: This requires -dynamic.
     if (Symbol->isUndefined())
-      Symbol->setFlags(Symbol->getFlags() | SF_WeakReference);
+      Symbol->setWeakReference();
     break;
 
   case MCSA_WeakDefinition:
     // FIXME: 'as' enforces that this is defined and global. The manual claims
     // it has to be in a coalesced section, but this isn't enforced.
-    Symbol->setFlags(Symbol->getFlags() | SF_WeakDefinition);
+    Symbol->setWeakDefinition();
     break;
 
   case MCSA_WeakDefAutoPrivate:
-    Symbol->setFlags(Symbol->getFlags() | SF_WeakDefinition | SF_WeakReference);
+    Symbol->setWeakDefinition();
+    Symbol->setWeakReference();
     break;
   }
 
@@ -372,10 +376,8 @@ bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
 
 void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
   // Encode the 'desc' value into the lowest implementation defined bits.
-  assert(DescValue == (DescValue & SF_DescFlagsMask) &&
-         "Invalid .desc value!");
   getAssembler().registerSymbol(*Symbol);
-  Symbol->setFlags(DescValue & SF_DescFlagsMask);
+  cast<MCSymbolMachO>(Symbol)->setDesc(DescValue);
 }
 
 void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
diff --git a/llvm/lib/MC/MachObjectWriter.cpp b/llvm/lib/MC/MachObjectWriter.cpp
index c2f7f211359..fc046b85434 100644
--- a/llvm/lib/MC/MachObjectWriter.cpp
+++ b/llvm/lib/MC/MachObjectWriter.cpp
@@ -18,7 +18,7 @@
 #include "llvm/MC/MCMachOSymbolFlags.h"
 #include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCSectionMachO.h"
-#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCSymbolMachO.h"
 #include "llvm/MC/MCValue.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -46,7 +46,7 @@ bool MachObjectWriter::doesSymbolRequireExternRelocation(const MCSymbol &S) {
 
   // References to weak definitions require external relocation entries; the
   // definition may not always be the one in the same object file.
-  if (S.getFlags() & SF_WeakDefinition)
+  if (cast<MCSymbolMachO>(S).isWeakDefinition())
     return true;
 
   // Otherwise, we can use an internal relocation.
@@ -327,7 +327,6 @@ void MachObjectWriter::writeNlist(MachSymbolData &MSD,
   const MCSymbol *AliasedSymbol = &findAliasedSymbol(*Symbol);
   uint8_t SectionIndex = MSD.SectionIndex;
   uint8_t Type = 0;
-  uint16_t Flags = Symbol->getFlags();
   uint64_t Address = 0;
   bool IsAlias = Symbol != AliasedSymbol;
 
@@ -371,23 +370,8 @@ void MachObjectWriter::writeNlist(MachSymbolData &MSD,
     // Common symbols are encoded with the size in the address
     // field, and their alignment in the flags.
     Address = Symbol->getCommonSize();
-
-    // Common alignment is packed into the 'desc' bits.
-    if (unsigned Align = Symbol->getCommonAlignment()) {
-      unsigned Log2Size = Log2_32(Align);
-      assert((1U << Log2Size) == Align && "Invalid 'common' alignment!");
-      if (Log2Size > 15)
-        report_fatal_error("invalid 'common' alignment '" +
-                           Twine(Align) + "' for '" + Symbol->getName() + "'",
-                           false);
-      // FIXME: Keep this mask with the SymbolFlags enumeration.
-      Flags = (Flags & 0xF0FF) | (Log2Size << 8);
-    }
   }
 
-  if (Layout.getAssembler().isThumbFunc(Symbol))
-    Flags |= SF_ThumbFunc;
-
   // struct nlist (12 bytes)
 
   write32(MSD.StringIndex);
@@ -396,7 +380,7 @@ void MachObjectWriter::writeNlist(MachSymbolData &MSD,
 
   // The Mach-O streamer uses the lowest 16-bits of the flags for the 'desc'
   // value.
-  write16(Flags);
+  write16(cast<MCSymbolMachO>(Symbol)->getEncodedFlags());
   if (is64Bit())
     write64(Address);
   else
@@ -515,7 +499,7 @@ void MachObjectWriter::bindIndirectSymbols(MCAssembler &Asm) {
     bool Created;
     Asm.registerSymbol(*it->Symbol, &Created);
     if (Created)
-      it->Symbol->setFlags(it->Symbol->getFlags() | 0x0001);
+      cast<MCSymbolMachO>(it->Symbol)->setReferenceTypeUndefinedLazy(true);
   }
 }