1 files changed, 52 insertions, 0 deletions
diff --git a/src/WebAssembly/Execution/Store.php b/src/WebAssembly/Execution/Store.php
new file mode 100644
index 0000000..5bef648
--- /dev/null
+++ b/src/WebAssembly/Execution/Store.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\WebAssembly\Execution;
+
+use RuntimeException;
+use function count;
+
+final class Store
+{
+    /**
+     * @param list<FuncInst> $funcs
+     * @param list<TableInst> $tables
+     * @param list<MemInst> $mems
+     * @param list<GlobalInst> $globals
+     * @param list<ElemInst> $elems
+     * @param list<DataInst> $datas
+     */
+    public function __construct(
+        public array $funcs,
+        public array $tables,
+        public array $mems,
+        public array $globals,
+        public array $elems,
+        public array $datas,
+    ) {
+    }
+
+    public static function empty(): self
+    {
+        return new self([], [], [], [], [], []);
+    }
+
+    public function register(Extern $extern): ExternVal
+    {
+        match ($extern::class) {
+            Externs\Func::class => $this->funcs[] = $extern->func,
+            Externs\Table::class => $this->tables[] = $extern->table,
+            Externs\Mem::class => $this->mems[] = $extern->mem,
+            Externs\Global_::class => $this->globals[] = $extern->global,
+            default => throw new RuntimeException("unreachable"),
+        };
+        return match ($extern::class) {
+            Externs\Func::class => ExternVal::Func(count($this->funcs) - 1),
+            Externs\Table::class => ExternVal::Table(count($this->tables) - 1),
+            Externs\Mem::class => ExternVal::Mem(count($this->mems) - 1),
+            Externs\Global_::class => ExternVal::Global_(count($this->globals) - 1),
+            default => throw new RuntimeException("unreachable"),
+        };
+    }
+}