[WebAssembly] Add explicit symbol table

This change modified lld to in response the llvm change which
moved to a more explicit symbol table in the object format.

Based on patches by Nicholas Wilson:
 1. https://reviews.llvm.org/D41955
 2. https://reviews.llvm.org/D42585

The primary difference that we see in the test output is that
for relocatable (-r) output we now have symbol table which
replaces exports/imports and globals.

See: https://github.com/WebAssembly/tool-conventions/issues/38
Differential Revision: https://reviews.llvm.org/D43264

llvm-svn: 325861

1 files changed, 7 insertions, 0 deletions

diff --git a/lld/wasm/WriterUtils.cpp b/lld/wasm/WriterUtils.cpp
index c82a36abc19..0d3b5f0aca0 100644
--- a/lld/wasm/WriterUtils.cpp
+++ b/lld/wasm/WriterUtils.cpp
@@ -190,3 +190,10 @@ std::string lld::toString(const WasmSignature &Sig) {
     S += toString(static_cast<ValType>(Sig.ReturnType));
   return S.str();
 }
+
+std::string lld::toString(const WasmGlobalType &Sig) {
+  std::string S = toString(static_cast<ValType>(Sig.Type));
+  if (Sig.Mutable)
+    return "mutable " + S;
+  return S;
+}