test: implement "register" action of WAST

7 files changed, 128 insertions, 4 deletions

diff --git a/src/Execution/Extern.php b/src/Execution/Extern.php
new file mode 100644
index 0000000..e0b695e
--- /dev/null
+++ b/src/Execution/Extern.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\Execution;
+
+abstract readonly class Extern
+{
+    final public static function Func(FuncInst $func): Externs\Func
+    {
+        return new Externs\Func($func);
+    }
+
+    final public static function Table(TableInst $table): Externs\Table
+    {
+        return new Externs\Table($table);
+    }
+
+    final public static function Mem(MemInst $mem): Externs\Mem
+    {
+        return new Externs\Mem($mem);
+    }
+
+    final public static function Global_(GlobalInst $global): Externs\Global_
+    {
+        return new Externs\Global_($global);
+    }
+}
diff --git a/src/Execution/Externs/Func.php b/src/Execution/Externs/Func.php
new file mode 100644
index 0000000..124309c
--- /dev/null
+++ b/src/Execution/Externs/Func.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\Execution\Externs;
+
+use Nsfisis\Waddiwasi\Execution\Extern;
+use Nsfisis\Waddiwasi\Execution\FuncInst;
+
+final readonly class Func extends Extern
+{
+    protected function __construct(
+        public FuncInst $func,
+    ) {
+    }
+}
diff --git a/src/Execution/Externs/Global_.php b/src/Execution/Externs/Global_.php
new file mode 100644
index 0000000..ccf9ad0
--- /dev/null
+++ b/src/Execution/Externs/Global_.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\Execution\Externs;
+
+use Nsfisis\Waddiwasi\Execution\Extern;
+use Nsfisis\Waddiwasi\Execution\GlobalInst;
+
+final readonly class Global_ extends Extern
+{
+    protected function __construct(
+        public GlobalInst $global,
+    ) {
+    }
+}
diff --git a/src/Execution/Externs/Mem.php b/src/Execution/Externs/Mem.php
new file mode 100644
index 0000000..bd1f119
--- /dev/null
+++ b/src/Execution/Externs/Mem.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\Execution\Externs;
+
+use Nsfisis\Waddiwasi\Execution\Extern;
+use Nsfisis\Waddiwasi\Execution\MemInst;
+
+final readonly class Mem extends Extern
+{
+    protected function __construct(
+        public MemInst $mem,
+    ) {
+    }
+}
diff --git a/src/Execution/Externs/Table.php b/src/Execution/Externs/Table.php
new file mode 100644
index 0000000..fde1e32
--- /dev/null
+++ b/src/Execution/Externs/Table.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\Execution\Externs;
+
+use Nsfisis\Waddiwasi\Execution\Extern;
+use Nsfisis\Waddiwasi\Execution\TableInst;
+
+final readonly class Table extends Extern
+{
+    protected function __construct(
+        public TableInst $table,
+    ) {
+    }
+}
diff --git a/src/Execution/Runtime.php b/src/Execution/Runtime.php
index 02c526c..2cc37b2 100644
--- a/src/Execution/Runtime.php
+++ b/src/Execution/Runtime.php
@@ -56,11 +56,30 @@ final class Runtime
     }
 
     /**
-     * @param list<ExternVal> $externVals
+     * @param array<string, array<string, Extern>> $imports
      */
     public static function instantiate(
         Store $store,
         Module $module,
+        array $imports,
+    ): self {
+        $externVals = [];
+        foreach ($module->imports as $import) {
+            $extern = $imports[$import->module][$import->name] ?? null;
+            if ($extern === null) {
+                throw new RuntimeException("instantiate: import not found: {$import->module}::{$import->name}");
+            }
+            $externVals[] = $store->register($extern);
+        }
+        return self::doInstantiate($store, $module, $externVals);
+    }
+
+    /**
+     * @param list<ExternVal> $externVals
+     */
+    private static function doInstantiate(
+        Store $store,
+        Module $module,
         array $externVals,
     ): self {
         $allocator = new Allocator($store);
diff --git a/src/Execution/Store.php b/src/Execution/Store.php
index 2b1a26d..52a8ce1 100644
--- a/src/Execution/Store.php
+++ b/src/Execution/Store.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Nsfisis\Waddiwasi\Execution;
 
+use RuntimeException;
 use function count;
 
 final class Store
@@ -31,9 +32,21 @@ final class Store
         return new self([], [], [], [], [], []);
     }
 
-    public function registerFunc(FuncInst $func): ExternVals\Func
+    public function register(Extern $extern): ExternVal
     {
-        $this->funcs[] = $func;
-        return ExternVal::Func(count($this->funcs) - 1);
+        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"),
+        };
     }
 }