MC: Change MCAssembler::Symbols to store MCSymbol, NFC

Instead of storing a list of the `MCSymbolData` in use, store the
`MCSymbol`s.  Churning in the direction of removing the back pointer
from `MCSymbolData`.

llvm-svn: 237496

llvm/include/llvm/MC/MCAssembler.h

@@ -676,7 +676,7 @@ class MCAssembler {
 
 public:
   typedef iplist<MCSectionData> SectionDataListType;
-  typedef std::vector<MCSymbolData *> SymbolDataListType;
+  typedef std::vector<const MCSymbol *> SymbolDataListType;
 
   typedef SectionDataListType::const_iterator const_iterator;
   typedef SectionDataListType::iterator iterator;
@@ -1052,7 +1052,7 @@ public:
       *Created = !hasSymbolData(Symbol);
     if (!hasSymbolData(Symbol)) {
       Symbol.getUnsafeData().initialize(Symbol, nullptr, 0);
-      Symbols.push_back(&Symbol.getData());
+      Symbols.push_back(&Symbol);
     }
     return Symbol.getData();
   }

llvm/lib/MC/ELFObjectWriter.cpp

@@ -422,8 +422,8 @@ void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
   // The presence of symbol versions causes undefined symbols and
   // versions declared with @@@ to be renamed.
 
-  for (MCSymbolData &OriginalData : Asm.symbols()) {
-    const MCSymbol &Alias = OriginalData.getSymbol();
+  for (const MCSymbol &Alias : Asm.symbols()) {
+    MCSymbolData &OriginalData = Alias.getData();
 
     // Not an alias.
     if (!Alias.isVariable())
@@ -936,8 +936,8 @@ void ELFObjectWriter::computeSymbolTable(
   }
 
   // Add the data for the symbols.
-  for (MCSymbolData &SD : Asm.symbols()) {
-    const MCSymbol &Symbol = SD.getSymbol();
+  for (const MCSymbol &Symbol : Asm.symbols()) {
+    MCSymbolData &SD = Symbol.getData();
 
     bool Used = UsedInReloc.count(&Symbol);
     bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol);

llvm/lib/MC/MCMachOStreamer.cpp

@@ -465,9 +465,9 @@ void MCMachOStreamer::FinishImpl() {
   // First, scan the symbol table to build a lookup table from fragments to
   // defining symbols.
   DenseMap<const MCFragment*, MCSymbolData*> DefiningSymbolMap;
-  for (MCSymbolData &SD : getAssembler().symbols()) {
-    if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()) &&
-        SD.getFragment()) {
+  for (const MCSymbol &Symbol : getAssembler().symbols()) {
+    MCSymbolData &SD = Symbol.getData();
+    if (getAssembler().isSymbolLinkerVisible(Symbol) && SD.getFragment()) {
       // An atom defining symbol should never be internal to a fragment.
       assert(SD.getOffset() == 0 && "Invalid offset in atom defining symbol!");
       DefiningSymbolMap[SD.getFragment()] = &SD;

llvm/lib/MC/MachObjectWriter.cpp

@@ -548,8 +548,7 @@ void MachObjectWriter::ComputeSymbolTable(
   assert(Index <= 256 && "Too many sections!");
 
   // Build the string table.
-  for (MCSymbolData &SD : Asm.symbols()) {
-    const MCSymbol &Symbol = SD.getSymbol();
+  for (const MCSymbol &Symbol : Asm.symbols()) {
     if (!Asm.isSymbolLinkerVisible(Symbol))
       continue;
 
@@ -562,8 +561,8 @@ void MachObjectWriter::ComputeSymbolTable(
   // The particular order that we collect and then sort the symbols is chosen to
   // match 'as'. Even though it doesn't matter for correctness, this is
   // important for letting us diff .o files.
-  for (MCSymbolData &SD : Asm.symbols()) {
-    const MCSymbol &Symbol = SD.getSymbol();
+  for (const MCSymbol &Symbol : Asm.symbols()) {
+    MCSymbolData &SD = Symbol.getData();
 
     // Ignore non-linker visible symbols.
     if (!Asm.isSymbolLinkerVisible(Symbol))
@@ -590,8 +589,8 @@ void MachObjectWriter::ComputeSymbolTable(
   }
 
   // Now add the data for local symbols.
-  for (MCSymbolData &SD : Asm.symbols()) {
-    const MCSymbol &Symbol = SD.getSymbol();
+  for (const MCSymbol &Symbol : Asm.symbols()) {
+    MCSymbolData &SD = Symbol.getData();
 
     // Ignore non-linker visible symbols.
     if (!Asm.isSymbolLinkerVisible(Symbol))

llvm/lib/MC/WinCOFFObjectWriter.cpp

@@ -642,9 +642,9 @@ void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
   for (const auto &Section : Asm)
     DefineSection(Section);
 
-  for (MCSymbolData &SD : Asm.symbols())
-    if (ExportSymbol(SD.getSymbol(), Asm))
-      DefineSymbol(SD, Asm, Layout);
+  for (const MCSymbol &Symbol : Asm.symbols())
+    if (ExportSymbol(Symbol, Asm))
+      DefineSymbol(Symbol.getData(), Asm, Layout);
 }
 
 bool WinCOFFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(