Update testsuite (w/ reference-types changes) (#1351)

The new table-sub test, checks whether the subtyping is handled
properly w/ table.init and table.copy instructions.

The BeginElemSegment callback can't pass the element type anymore, since
it's not known yet. The callback also can't be deferred, since the
BeginElemSegmentInitExpr callback has to happen after the
BeginElemSegment callback, but the reference type is not always known
until after the initializer expression is read. To work around this, I
added a new OnElemSegmentElemType callback.

Other element segment changes:

* The element type must be tracked in the SharedValidator
* A subtle fix: when writing out the segment flags, we need to take into
  account whether the element type of the segment is not funcref, even
  if there are no element expressions. In that case, we have to use flag
  bit 0x4 (SegUseElemExprs).

In addition, the TableCopy and TableInit instructions weren't handling
table indexes fully.

* TableCopy variables are read in the parser (both optional)
* TableCopy names are now resolved + applied
* TableCopy indexes are now validated
* TableInit table variables are read in the parser; this is subtle,
  since the text format has order $table $segment, but the $table is
  optional.

1 files changed, 7 insertions, 4 deletions

diff --git a/src/ir.cc b/src/ir.cc
index 33aae7ed..9b7e414b 100644
--- a/src/ir.cc
+++ b/src/ir.cc
@@ -653,6 +653,8 @@ Const::Const(V128Tag, v128 value, const Location& loc_)
 uint8_t ElemSegment::GetFlags(const Module* module) const {
   uint8_t flags = 0;
 
+  bool all_ref_func = elem_type == Type::Funcref;
+
   switch (kind) {
     case SegmentKind::Active: {
       Index table_index = module->GetTableIndex(table_var);
@@ -671,10 +673,11 @@ uint8_t ElemSegment::GetFlags(const Module* module) const {
       break;
   }
 
-  bool all_ref_func = std::all_of(
-      elem_exprs.begin(), elem_exprs.end(), [](const ElemExpr& elem_expr) {
-        return elem_expr.kind == ElemExprKind::RefFunc;
-      });
+  all_ref_func = all_ref_func &&
+                 std::all_of(elem_exprs.begin(), elem_exprs.end(),
+                             [](const ElemExpr& elem_expr) {
+                               return elem_expr.kind == ElemExprKind::RefFunc;
+                             });
   if (!all_ref_func) {
     flags |= SegUseElemExprs;
   }