[Parser] Parse start declarations (#6256)

1 files changed, 14 insertions, 0 deletions

diff --git a/src/parser/contexts.h b/src/parser/contexts.h
index c1ccefe53..507a54342 100644
--- a/src/parser/contexts.h
+++ b/src/parser/contexts.h
@@ -589,6 +589,7 @@ struct ParseDeclsCtx : NullTypeParserCtx, NullInstrParserCtx {
   std::vector<DefPos> tableDefs;
   std::vector<DefPos> memoryDefs;
   std::vector<DefPos> globalDefs;
+  std::vector<DefPos> startDefs;
   std::vector<DefPos> elemDefs;
   std::vector<DefPos> dataDefs;
   std::vector<DefPos> tagDefs;
@@ -715,6 +716,14 @@ struct ParseDeclsCtx : NullTypeParserCtx, NullInstrParserCtx {
                      std::optional<ExprT>,
                      Index pos);
 
+  Result<> addStart(FuncIdxT, Index pos) {
+    if (!startDefs.empty()) {
+      return Err{"unexpected extra 'start' function"};
+    }
+    startDefs.push_back({{}, pos, 0});
+    return Ok{};
+  }
+
   Result<> addElem(Name, TableIdxT*, std::optional<ExprT>, ElemListT&&, Index);
 
   Result<> addDeclareElem(Name, ElemListT&&, Index) { return Ok{}; }
@@ -1325,6 +1334,11 @@ struct ParseDefsCtx : TypeParserCtx<ParseDefsCtx> {
                      std::optional<ExprT> exp,
                      Index);
 
+  Result<> addStart(Name name, Index pos) {
+    wasm.start = name;
+    return Ok{};
+  }
+
   Result<> addImplicitElems(Type type, std::vector<Expression*>&& elems);
 
   Result<> addDeclareElem(Name, std::vector<Expression*>&&, Index) {