[WebAssembly] Refactor synthetic sections and relocation processing. NFC.

Major refactor to better match the structure of the ELF linker.

- Split out relocation processing into scanRelocations
- Split out synthetic sections into their own classes.

Differential Revision: https://reviews.llvm.org/D61811

llvm-svn: 361233

1 files changed, 5 insertions, 2 deletions

diff --git a/lld/wasm/InputFiles.cpp b/lld/wasm/InputFiles.cpp
index 9699b8f49f7..b53818ca4da 100644
--- a/lld/wasm/InputFiles.cpp
+++ b/lld/wasm/InputFiles.cpp
@@ -75,7 +75,10 @@ uint32_t ObjFile::calcNewIndex(const WasmRelocation &Reloc) const {
     assert(TypeIsUsed[Reloc.Index]);
     return TypeMap[Reloc.Index];
   }
-  return Symbols[Reloc.Index]->getOutputSymbolIndex();
+  const Symbol *Sym = Symbols[Reloc.Index];
+  if (auto *SS = dyn_cast<SectionSymbol>(Sym))
+    Sym = SS->getOutputSectionSymbol();
+  return Sym->getOutputSymbolIndex();
 }
 
 // Relocations can contain addend for combined sections. This function takes a
@@ -395,7 +398,7 @@ Symbol *ObjFile::createDefined(const WasmSymbol &Sym) {
   case WASM_SYMBOL_TYPE_SECTION: {
     InputSection *Section = CustomSectionsByIndex[Sym.Info.ElementIndex];
     assert(Sym.isBindingLocal());
-    return make<SectionSymbol>(Name, Flags, Section, this);
+    return make<SectionSymbol>(Flags, Section, this);
   }
   case WASM_SYMBOL_TYPE_EVENT: {
     InputEvent *Event =