[WebAssembly] Add support for bitcode archive members

This change effects the behavior of --export-all. Previously
--export-all would only effect symbols that survived GC. Now
--export-all will prevent any non-local symbols from being GCed.

Differential Revision: https://reviews.llvm.org/D48673

llvm-svn: 335878

1 files changed, 10 insertions, 0 deletions

diff --git a/lld/wasm/Symbols.cpp b/lld/wasm/Symbols.cpp
index 6b43eb36341..ef135b35b1a 100644
--- a/lld/wasm/Symbols.cpp
+++ b/lld/wasm/Symbols.cpp
@@ -98,6 +98,16 @@ void Symbol::setHidden(bool IsHidden) {
     Flags |= WASM_SYMBOL_VISIBILITY_DEFAULT;
 }
 
+bool Symbol::isExported() const {
+  if (!isDefined() || isLocal())
+    return false;
+
+  if (Config->ExportAll)
+    return true;
+
+  return !isHidden();
+}
+
 uint32_t FunctionSymbol::getFunctionIndex() const {
   if (auto *F = dyn_cast<DefinedFunction>(this))
     return F->Function->getFunctionIndex();