[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, 2 insertions, 1 deletions

diff --git a/lld/wasm/OutputSegment.h b/lld/wasm/OutputSegment.h
index 9825ce8e697..d3918a5ea1b 100644
--- a/lld/wasm/OutputSegment.h
+++ b/lld/wasm/OutputSegment.h
@@ -21,7 +21,7 @@ class InputSegment;
 
 class OutputSegment {
 public:
-  OutputSegment(StringRef N) : Name(N) {}
+  OutputSegment(StringRef N, uint32_t Index) : Name(N), Index(Index) {}
 
   void addInputSegment(InputSegment *Segment) {
     Alignment = std::max(Alignment, Segment->getAlignment());
@@ -36,6 +36,7 @@ public:
   void setSectionOffset(uint32_t Offset) { SectionOffset = Offset; }
 
   StringRef Name;
+  const uint32_t Index;
   uint32_t Alignment = 0;
   uint32_t StartVA = 0;
   std::vector<InputSegment *> InputSegments;