[Wasm GC] ArrayInit support (#4138)

array.init is like array.new_with_rtt except that it takes
as arguments the values to initialize the array with (as opposed to
a size and an optional initial value).

Spec: https://docs.google.com/document/d/1afthjsL_B9UaMqCA5ekgVmOm75BVFu6duHNsN9-gnXw/edit#

1 files changed, 26 insertions, 0 deletions

diff --git a/src/wasm/wasm-validator.cpp b/src/wasm/wasm-validator.cpp
index 450a7b956..eaeea7f1a 100644
--- a/src/wasm/wasm-validator.cpp
+++ b/src/wasm/wasm-validator.cpp
@@ -382,6 +382,7 @@ public:
   void visitStructGet(StructGet* curr);
   void visitStructSet(StructSet* curr);
   void visitArrayNew(ArrayNew* curr);
+  void visitArrayInit(ArrayInit* curr);
   void visitArrayGet(ArrayGet* curr);
   void visitArraySet(ArraySet* curr);
   void visitArrayLen(ArrayLen* curr);
@@ -2416,6 +2417,31 @@ void FunctionValidator::visitArrayNew(ArrayNew* curr) {
   }
 }
 
+void FunctionValidator::visitArrayInit(ArrayInit* curr) {
+  shouldBeTrue(getModule()->features.hasGC(),
+               curr,
+               "array.init requires gc to be enabled");
+  if (curr->type == Type::unreachable) {
+    return;
+  }
+  if (!shouldBeTrue(
+        curr->rtt->type.isRtt(), curr, "array.init rtt must be rtt")) {
+    return;
+  }
+  auto heapType = curr->rtt->type.getHeapType();
+  if (!shouldBeTrue(
+        heapType.isArray(), curr, "array.init heap type must be array")) {
+    return;
+  }
+  const auto& element = heapType.getArray().element;
+  for (auto* value : curr->values) {
+    shouldBeSubType(value->type,
+                    element.type,
+                    curr,
+                    "array.init value must have proper type");
+  }
+}
+
 void FunctionValidator::visitArrayGet(ArrayGet* curr) {
   shouldBeTrue(
     getModule()->features.hasGC(), curr, "array.get requires gc to be enabled");