Implement array.fill, array.init_data, and array.init_elem (#5637)

These complement array.copy, which we already supported, as an initial complete
set of bulk array operations. Replace the WIP spec tests with the upstream spec
tests, lightly edited for compatibility with Binaryen.

1 files changed, 31 insertions, 0 deletions

diff --git a/src/wasm/wasm-stack.cpp b/src/wasm/wasm-stack.cpp
index 9e22efc0c..286b049aa 100644
--- a/src/wasm/wasm-stack.cpp
+++ b/src/wasm/wasm-stack.cpp
@@ -2185,6 +2185,37 @@ void BinaryInstWriter::visitArrayCopy(ArrayCopy* curr) {
   parent.writeIndexedHeapType(curr->srcRef->type.getHeapType());
 }
 
+void BinaryInstWriter::visitArrayFill(ArrayFill* curr) {
+  if (curr->ref->type.isNull()) {
+    emitUnreachable();
+    return;
+  }
+  o << int8_t(BinaryConsts::GCPrefix) << U32LEB(BinaryConsts::ArrayFill);
+  parent.writeIndexedHeapType(curr->ref->type.getHeapType());
+}
+
+void BinaryInstWriter::visitArrayInit(ArrayInit* curr) {
+  if (curr->ref->type.isNull()) {
+    emitUnreachable();
+    return;
+  }
+  o << int8_t(BinaryConsts::GCPrefix);
+  switch (curr->op) {
+    case InitData:
+      o << U32LEB(BinaryConsts::ArrayInitData);
+      parent.writeIndexedHeapType(curr->ref->type.getHeapType());
+      o << U32LEB(parent.getDataSegmentIndex(curr->segment));
+      break;
+    case InitElem:
+      o << U32LEB(BinaryConsts::ArrayInitElem);
+      parent.writeIndexedHeapType(curr->ref->type.getHeapType());
+      o << U32LEB(parent.getElementSegmentIndex(curr->segment));
+      break;
+    default:
+      WASM_UNREACHABLE("unexpected op");
+  }
+}
+
 void BinaryInstWriter::visitRefAs(RefAs* curr) {
   switch (curr->op) {
     case RefAsNonNull: