[Swift] Initial demangling support

Author: bdash

Cargo.lock

@@ -16,3 +16,4 @@ binaryninja = { workspace = true }
 binaryninjacore-sys.workspace = true
 tracing = "0.1"
 thiserror = "2.0"
+swift-demangler = { git = "https://github.com/Vector35/swift-demangler.git" }

plugins/workflow_swift/Cargo.toml

@@ -0,0 +1,34 @@
+use binaryninja::architecture::CoreArchitecture;
+use binaryninja::binary_view::BinaryView;
+use binaryninja::demangle::CustomDemangler;
+use binaryninja::rc::Ref;
+use binaryninja::types::{QualifiedName, Type};
+
+pub struct SwiftDemangler;
+
+impl CustomDemangler for SwiftDemangler {
+    fn is_mangled_string(&self, name: &str) -> bool {
+        name.starts_with("$s")
+            || name.starts_with("_$s")
+            || name.starts_with("$S")
+            || name.starts_with("_$S")
+            || name.starts_with("$e")
+            || name.starts_with("_$e")
+            || name.starts_with("_T")
+    }
+
+    fn demangle(
+        &self,
+        _arch: &CoreArchitecture,
+        name: &str,
+        _view: Option<Ref<BinaryView>>,
+    ) -> Option<(QualifiedName, Option<Ref<Type>>)> {
+        let ctx = swift_demangler::Context::new();
+        let symbol = swift_demangler::Symbol::parse(&ctx, name)?;
+        // Use the canonical demangled form from the parsed node tree.
+        // This matches what `xcrun swift-demangle` produces.
+        // TODO: Use the structured Symbol API to also reconstruct BN Types.
+        let demangled = symbol.display();
+        Some((QualifiedName::from(demangled), None))
+    }
+}

plugins/workflow_swift/src/demangler/mod.rs

@@ -1,4 +1,9 @@
+mod demangler;
+
+use crate::demangler::SwiftDemangler;
 use binaryninja::add_optional_plugin_dependency;
+use binaryninja::demangle::Demangler;
+use demangler::SwiftDemangler;
 
 #[no_mangle]
 #[allow(non_snake_case)]
@@ -12,5 +17,7 @@ pub extern "C" fn CorePluginDependencies() {
 pub extern "C" fn CorePluginInit() -> bool {
     binaryninja::tracing_init!("Plugin.Swift");
 
+    Demangler::register("Swift", SwiftDemangler);
+
     true
 }