feat: add Linker class

1 files changed, 49 insertions, 0 deletions

diff --git a/src/WebAssembly/Execution/Linker.php b/src/WebAssembly/Execution/Linker.php
new file mode 100644
index 0000000..3c9c1d0
--- /dev/null
+++ b/src/WebAssembly/Execution/Linker.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\WebAssembly\Execution;
+
+use Nsfisis\Waddiwasi\WebAssembly\Structure\Modules\Module;
+
+final class Linker
+{
+    /**
+     * @var array<string, array<string, ExternVal>>
+     */
+    private array $symbols = [];
+
+    public function __construct(
+        private Store $store,
+    ) {
+    }
+
+    public function register(string $namespace, string $name, Extern $extern): void
+    {
+        $externVal = $this->store->register($extern);
+        $this->symbols[$namespace][$name] = $externVal;
+    }
+
+    public function registerNamespace(string $namespace, ExporterInterface $exporter): void
+    {
+        foreach ($exporter->exports() as $export) {
+            $this->symbols[$namespace][$export->name] = $export->value;
+        }
+    }
+
+    /**
+     * @return list<ExternVal>
+     */
+    public function resolve(Module $module): array
+    {
+        $externVals = [];
+        foreach ($module->imports as $import) {
+            $externVal = $this->symbols[$import->module][$import->name] ?? null;
+            if ($externVal === null) {
+                throw new LinkErrorException("import not found: {$import->module}::{$import->name}");
+            }
+            $externVals[] = $externVal;
+        }
+        return $externVals;
+    }
+}