Multivalue type creation and inspection (#2459)

Adds the ability to create multivalue types from vectors of concrete value
types. All types are transparently interned, so their representation is still a
single uint32_t. Types can be extracted into vectors of their component parts,
and all the single value types expand into vectors containing themselves.

Multivalue types are not yet used in the IR, but their creation and inspection
functionality is exposed and tested in the C and JS APIs.

Also makes common type predicates methods of Type and improves the ergonomics of
type printing.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/wasm-builder.h b/src/wasm-builder.h
index d47ec413f..87b1f0306 100644
--- a/src/wasm-builder.h
+++ b/src/wasm-builder.h
@@ -325,7 +325,7 @@ public:
     ret->value = value;
     ret->valueType = type;
     ret->finalize();
-    assert(isConcreteType(ret->value->type) ? ret->value->type == type : true);
+    assert(ret->value->type.isConcrete() ? ret->value->type == type : true);
     return ret;
   }
   Store* makeAtomicStore(unsigned bytes,
@@ -596,7 +596,7 @@ public:
 
   static Index addVar(Function* func, Name name, Type type) {
     // always ok to add a var, it does not affect other indices
-    assert(isConcreteType(type));
+    assert(type.isConcrete());
     Index index = func->getNumLocals();
     if (name.is()) {
       func->localIndices[name] = index;
@@ -701,7 +701,7 @@ public:
 
   // Drop an expression if it has a concrete type
   Expression* dropIfConcretelyTyped(Expression* curr) {
-    if (!isConcreteType(curr->type)) {
+    if (!curr->type.isConcrete()) {
       return curr;
     }
     return makeDrop(curr);