[lld] r362522 - [WebAssembly] Add comment as follow-up to rL362276. NFC.

[Sam Clegg via llvm-commits]

Author: sbc
Date: Tue Jun  4 09:35:23 2019
New Revision: 362522

URL: http://llvm.org/viewvc/llvm-project?rev=362522&view=rev
Log:
[WebAssembly] Add comment as follow-up to rL362276. NFC.

Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62824

Modified:
    lld/trunk/wasm/SymbolTable.cpp

Modified: lld/trunk/wasm/SymbolTable.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/wasm/SymbolTable.cpp?rev=362522&r1=362521&r2=362522&view=diff
==============================================================================
--- lld/trunk/wasm/SymbolTable.cpp (original)
+++ lld/trunk/wasm/SymbolTable.cpp Tue Jun  4 09:35:23 2019
@@ -199,10 +199,12 @@ DefinedFunction *SymbolTable::addSynthet
                                         Flags, nullptr, Function);
 }
 
+// Adds an optional, linker generated, data symbols.  The symbol will only be
+// added if there is an undefine reference to it, or if it is explictly exported
+// via the --export flag.  Otherwise we don't add the symbol and return nullptr.
 DefinedData *SymbolTable::addOptionalDataSymbol(StringRef Name, uint32_t Value,
                                                 uint32_t Flags) {
   Symbol *S = find(Name);
-  // Enable --export of optional symbols
   if (!S && (Config->ExportAll || Config->ExportedSymbols.count(Name) != 0))
     S = insertName(Name).first;
   else if (!S || S->isDefined())