Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

48 files changed, 3175 insertions, 0 deletions

diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/callback_interface.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/callback_interface.rs
new file mode 100644
index 0000000000..5d8b37e0af
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/callback_interface.rs
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+
+#[derive(Debug)]
+pub struct CallbackInterfaceCodeType {
+    id: String,
+}
+
+impl CallbackInterfaceCodeType {
+    pub fn new(id: String) -> Self {
+        Self { id }
+    }
+}
+
+impl CodeType for CallbackInterfaceCodeType {
+    fn type_label(&self) -> String {
+        super::SwiftCodeOracle.class_name(&self.id)
+    }
+
+    fn canonical_name(&self) -> String {
+        format!("CallbackInterface{}", self.type_label())
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/compounds.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/compounds.rs
new file mode 100644
index 0000000000..8e6dddf3f9
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/compounds.rs
@@ -0,0 +1,108 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+use crate::backend::{Literal, Type};
+
+#[derive(Debug)]
+pub struct OptionalCodeType {
+    inner: Type,
+}
+
+impl OptionalCodeType {
+    pub fn new(inner: Type) -> Self {
+        Self { inner }
+    }
+}
+
+impl CodeType for OptionalCodeType {
+    fn type_label(&self) -> String {
+        format!("{}?", super::SwiftCodeOracle.find(&self.inner).type_label())
+    }
+
+    fn canonical_name(&self) -> String {
+        format!(
+            "Option{}",
+            super::SwiftCodeOracle.find(&self.inner).canonical_name()
+        )
+    }
+
+    fn literal(&self, literal: &Literal) -> String {
+        match literal {
+            Literal::Null => "nil".into(),
+            _ => super::SwiftCodeOracle.find(&self.inner).literal(literal),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct SequenceCodeType {
+    inner: Type,
+}
+
+impl SequenceCodeType {
+    pub fn new(inner: Type) -> Self {
+        Self { inner }
+    }
+}
+
+impl CodeType for SequenceCodeType {
+    fn type_label(&self) -> String {
+        format!(
+            "[{}]",
+            super::SwiftCodeOracle.find(&self.inner).type_label()
+        )
+    }
+
+    fn canonical_name(&self) -> String {
+        format!(
+            "Sequence{}",
+            super::SwiftCodeOracle.find(&self.inner).canonical_name()
+        )
+    }
+
+    fn literal(&self, literal: &Literal) -> String {
+        match literal {
+            Literal::EmptySequence => "[]".into(),
+            _ => unreachable!(),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct MapCodeType {
+    key: Type,
+    value: Type,
+}
+
+impl MapCodeType {
+    pub fn new(key: Type, value: Type) -> Self {
+        Self { key, value }
+    }
+}
+
+impl CodeType for MapCodeType {
+    fn type_label(&self) -> String {
+        format!(
+            "[{}: {}]",
+            super::SwiftCodeOracle.find(&self.key).type_label(),
+            super::SwiftCodeOracle.find(&self.value).type_label()
+        )
+    }
+
+    fn canonical_name(&self) -> String {
+        format!(
+            "Dictionary{}{}",
+            super::SwiftCodeOracle.find(&self.key).canonical_name(),
+            super::SwiftCodeOracle.find(&self.value).canonical_name()
+        )
+    }
+
+    fn literal(&self, literal: &Literal) -> String {
+        match literal {
+            Literal::EmptyMap => "[:]".into(),
+            _ => unreachable!(),
+        }
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/custom.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/custom.rs
new file mode 100644
index 0000000000..f4591b6eb6
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/custom.rs
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+
+#[derive(Debug)]
+pub struct CustomCodeType {
+    name: String,
+}
+
+impl CustomCodeType {
+    pub fn new(name: String) -> Self {
+        CustomCodeType { name }
+    }
+}
+
+impl CodeType for CustomCodeType {
+    fn type_label(&self) -> String {
+        self.name.clone()
+    }
+
+    fn canonical_name(&self) -> String {
+        format!("Type{}", self.name)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/enum_.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/enum_.rs
new file mode 100644
index 0000000000..14377ed9de
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/enum_.rs
@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+use crate::backend::Literal;
+
+#[derive(Debug)]
+pub struct EnumCodeType {
+    id: String,
+}
+
+impl EnumCodeType {
+    pub fn new(id: String) -> Self {
+        Self { id }
+    }
+}
+
+impl CodeType for EnumCodeType {
+    fn type_label(&self) -> String {
+        super::SwiftCodeOracle.class_name(&self.id)
+    }
+
+    fn canonical_name(&self) -> String {
+        format!("Type{}", self.id)
+    }
+
+    fn literal(&self, literal: &Literal) -> String {
+        if let Literal::Enum(v, _) = literal {
+            format!(".{}", super::SwiftCodeOracle.enum_variant_name(v))
+        } else {
+            unreachable!();
+        }
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/executor.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/executor.rs
new file mode 100644
index 0000000000..b488b004cf
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/executor.rs
@@ -0,0 +1,23 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+
+#[derive(Debug)]
+pub struct ForeignExecutorCodeType;
+
+impl CodeType for ForeignExecutorCodeType {
+    fn type_label(&self) -> String {
+        // On Swift, we define a struct to represent a ForeignExecutor
+        "UniFfiForeignExecutor".into()
+    }
+
+    fn canonical_name(&self) -> String {
+        "ForeignExecutor".into()
+    }
+
+    fn initialization_fn(&self) -> Option<String> {
+        Some("uniffiInitForeignExecutor".into())
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/external.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/external.rs
new file mode 100644
index 0000000000..0b6728ba84
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/external.rs
@@ -0,0 +1,36 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+
+#[derive(Debug)]
+pub struct ExternalCodeType {
+    name: String,
+}
+
+impl ExternalCodeType {
+    pub fn new(name: String) -> Self {
+        ExternalCodeType { name }
+    }
+}
+
+impl CodeType for ExternalCodeType {
+    fn type_label(&self) -> String {
+        self.name.clone()
+    }
+
+    fn canonical_name(&self) -> String {
+        format!("Type{}", self.name)
+    }
+
+    // lower and lift need to call public function which were generated for
+    // the original types.
+    fn lower(&self) -> String {
+        format!("{}_lower", self.ffi_converter_name())
+    }
+
+    fn lift(&self) -> String {
+        format!("{}_lift", self.ffi_converter_name())
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/miscellany.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/miscellany.rs
new file mode 100644
index 0000000000..c45091c80a
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/miscellany.rs
@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+
+#[derive(Debug)]
+pub struct TimestampCodeType;
+
+impl CodeType for TimestampCodeType {
+    fn type_label(&self) -> String {
+        "Date".into()
+    }
+
+    fn canonical_name(&self) -> String {
+        "Timestamp".into()
+    }
+}
+
+#[derive(Debug)]
+pub struct DurationCodeType;
+
+impl CodeType for DurationCodeType {
+    fn type_label(&self) -> String {
+        "TimeInterval".into()
+    }
+
+    fn canonical_name(&self) -> String {
+        "Duration".into()
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/mod.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/mod.rs
new file mode 100644
index 0000000000..12db4afc66
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/mod.rs
@@ -0,0 +1,688 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use once_cell::sync::Lazy;
+use std::borrow::Borrow;
+use std::cell::RefCell;
+use std::collections::{BTreeSet, HashMap, HashSet};
+use std::fmt::Debug;
+
+use anyhow::{Context, Result};
+use askama::Template;
+use heck::{ToLowerCamelCase, ToUpperCamelCase};
+use serde::{Deserialize, Serialize};
+
+use super::Bindings;
+use crate::backend::TemplateExpression;
+use crate::interface::*;
+use crate::BindingsConfig;
+
+mod callback_interface;
+mod compounds;
+mod custom;
+mod enum_;
+mod executor;
+mod external;
+mod miscellany;
+mod object;
+mod primitives;
+mod record;
+
+/// A trait tor the implementation.
+trait CodeType: Debug {
+    /// The language specific label used to reference this type. This will be used in
+    /// method signatures and property declarations.
+    fn type_label(&self) -> String;
+
+    /// A representation of this type label that can be used as part of another
+    /// identifier. e.g. `read_foo()`, or `FooInternals`.
+    ///
+    /// This is especially useful when creating specialized objects or methods to deal
+    /// with this type only.
+    fn canonical_name(&self) -> String {
+        self.type_label()
+    }
+
+    fn literal(&self, _literal: &Literal) -> String {
+        unimplemented!("Unimplemented for {}", self.type_label())
+    }
+
+    /// Name of the FfiConverter
+    ///
+    /// This is the object that contains the lower, write, lift, and read methods for this type.
+    fn ffi_converter_name(&self) -> String {
+        format!("FfiConverter{}", self.canonical_name())
+    }
+
+    // XXX - the below should be removed and replace with the ffi_converter_name reference in the template.
+    /// An expression for lowering a value into something we can pass over the FFI.
+    fn lower(&self) -> String {
+        format!("{}.lower", self.ffi_converter_name())
+    }
+
+    /// An expression for writing a value into a byte buffer.
+    fn write(&self) -> String {
+        format!("{}.write", self.ffi_converter_name())
+    }
+
+    /// An expression for lifting a value from something we received over the FFI.
+    fn lift(&self) -> String {
+        format!("{}.lift", self.ffi_converter_name())
+    }
+
+    /// An expression for reading a value from a byte buffer.
+    fn read(&self) -> String {
+        format!("{}.read", self.ffi_converter_name())
+    }
+
+    /// A list of imports that are needed if this type is in use.
+    /// Classes are imported exactly once.
+    fn imports(&self) -> Option<Vec<String>> {
+        None
+    }
+
+    /// Function to run at startup
+    fn initialization_fn(&self) -> Option<String> {
+        None
+    }
+}
+
+/// From <https://docs.swift.org/swift-book/documentation/the-swift-programming-language/lexicalstructure/#Keywords-and-Punctuation>
+static KEYWORDS: Lazy<HashSet<String>> = Lazy::new(|| {
+    [
+        // Keywords used in declarations:
+        "associatedtype",
+        "class",
+        "deinit",
+        "enum",
+        "extension",
+        "fileprivate",
+        "func",
+        "import",
+        "init",
+        "inout",
+        "internal",
+        "let",
+        "open",
+        "operator",
+        "private",
+        "precedencegroup",
+        "protocol",
+        "public",
+        "rethrows",
+        "static",
+        "struct",
+        "subscript",
+        "typealias",
+        "var",
+        // Keywords used in statements:
+        "break",
+        "case",
+        "catch",
+        "continue",
+        "default",
+        "defer",
+        "do",
+        "else",
+        "fallthrough",
+        "for",
+        "guard",
+        "if",
+        "in",
+        "repeat",
+        "return",
+        "throw",
+        "switch",
+        "where",
+        "while",
+        // Keywords used in expressions and types:
+        "Any",
+        "as",
+        "await",
+        "catch",
+        "false",
+        "is",
+        "nil",
+        "rethrows",
+        "self",
+        "Self",
+        "super",
+        "throw",
+        "throws",
+        "true",
+        "try",
+    ]
+    .iter()
+    .map(ToString::to_string)
+    .collect::<HashSet<_>>()
+});
+
+/// Quote a name for use in a context where keywords must be quoted
+pub fn quote_general_keyword(nm: String) -> String {
+    if KEYWORDS.contains(&nm) {
+        format!("`{nm}`")
+    } else {
+        nm
+    }
+}
+
+/// Per <https://docs.swift.org/swift-book/documentation/the-swift-programming-language/lexicalstructure/#Keywords-and-Punctuation> subset of keywords which need quoting in arg context.
+static ARG_KEYWORDS: Lazy<HashSet<String>> = Lazy::new(|| {
+    ["inout", "var", "let"]
+        .iter()
+        .map(ToString::to_string)
+        .collect::<HashSet<_>>()
+});
+
+/// Quote a name for use in arg context where fewer keywords must be quoted
+pub fn quote_arg_keyword(nm: String) -> String {
+    if ARG_KEYWORDS.contains(&nm) {
+        format!("`{nm}`")
+    } else {
+        nm
+    }
+}
+
+/// Config options for the caller to customize the generated Swift.
+///
+/// Note that this can only be used to control details of the Swift *that do not affect the underlying component*,
+/// since the details of the underlying component are entirely determined by the `ComponentInterface`.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct Config {
+    cdylib_name: Option<String>,
+    module_name: Option<String>,
+    ffi_module_name: Option<String>,
+    ffi_module_filename: Option<String>,
+    generate_module_map: Option<bool>,
+    omit_argument_labels: Option<bool>,
+    #[serde(default)]
+    custom_types: HashMap<String, CustomTypeConfig>,
+}
+
+#[derive(Debug, Default, Clone, Serialize, Deserialize)]
+pub struct CustomTypeConfig {
+    imports: Option<Vec<String>>,
+    type_name: Option<String>,
+    into_custom: TemplateExpression,
+    from_custom: TemplateExpression,
+}
+
+impl Config {
+    /// The name of the Swift module containing the high-level foreign-language bindings.
+    pub fn module_name(&self) -> String {
+        match self.module_name.as_ref() {
+            Some(name) => name.clone(),
+            None => "uniffi".into(),
+        }
+    }
+
+    /// The name of the lower-level C module containing the FFI declarations.
+    pub fn ffi_module_name(&self) -> String {
+        match self.ffi_module_name.as_ref() {
+            Some(name) => name.clone(),
+            None => format!("{}FFI", self.module_name()),
+        }
+    }
+
+    /// The filename stem for the lower-level C module containing the FFI declarations.
+    pub fn ffi_module_filename(&self) -> String {
+        match self.ffi_module_filename.as_ref() {
+            Some(name) => name.clone(),
+            None => self.ffi_module_name(),
+        }
+    }
+
+    /// The name of the `.modulemap` file for the lower-level C module with FFI declarations.
+    pub fn modulemap_filename(&self) -> String {
+        format!("{}.modulemap", self.ffi_module_filename())
+    }
+
+    /// The name of the `.h` file for the lower-level C module with FFI declarations.
+    pub fn header_filename(&self) -> String {
+        format!("{}.h", self.ffi_module_filename())
+    }
+
+    /// The name of the compiled Rust library containing the FFI implementation.
+    pub fn cdylib_name(&self) -> String {
+        if let Some(cdylib_name) = &self.cdylib_name {
+            cdylib_name.clone()
+        } else {
+            "uniffi".into()
+        }
+    }
+
+    /// Whether to generate a `.modulemap` file for the lower-level C module with FFI declarations.
+    pub fn generate_module_map(&self) -> bool {
+        self.generate_module_map.unwrap_or(true)
+    }
+
+    /// Whether to omit argument labels in Swift function definitions.
+    pub fn omit_argument_labels(&self) -> bool {
+        self.omit_argument_labels.unwrap_or(false)
+    }
+}
+
+impl BindingsConfig for Config {
+    fn update_from_ci(&mut self, ci: &ComponentInterface) {
+        self.module_name
+            .get_or_insert_with(|| ci.namespace().into());
+        self.cdylib_name
+            .get_or_insert_with(|| format!("uniffi_{}", ci.namespace()));
+    }
+
+    fn update_from_cdylib_name(&mut self, cdylib_name: &str) {
+        self.cdylib_name
+            .get_or_insert_with(|| cdylib_name.to_string());
+    }
+
+    fn update_from_dependency_configs(&mut self, _config_map: HashMap<&str, &Self>) {}
+}
+
+/// Generate UniFFI component bindings for Swift, as strings in memory.
+///
+pub fn generate_bindings(config: &Config, ci: &ComponentInterface) -> Result<Bindings> {
+    let header = BridgingHeader::new(config, ci)
+        .render()
+        .context("failed to render Swift bridging header")?;
+    let library = SwiftWrapper::new(config.clone(), ci)
+        .render()
+        .context("failed to render Swift library")?;
+    let modulemap = if config.generate_module_map() {
+        Some(
+            ModuleMap::new(config, ci)
+                .render()
+                .context("failed to render Swift modulemap")?,
+        )
+    } else {
+        None
+    };
+    Ok(Bindings {
+        library,
+        header,
+        modulemap,
+    })
+}
+
+/// Renders Swift helper code for all types
+///
+/// This template is a bit different than others in that it stores internal state from the render
+/// process.  Make sure to only call `render()` once.
+#[derive(Template)]
+#[template(syntax = "swift", escape = "none", path = "Types.swift")]
+pub struct TypeRenderer<'a> {
+    config: &'a Config,
+    ci: &'a ComponentInterface,
+    // Track included modules for the `include_once()` macro
+    include_once_names: RefCell<HashSet<String>>,
+    // Track imports added with the `add_import()` macro
+    imports: RefCell<BTreeSet<String>>,
+}
+
+impl<'a> TypeRenderer<'a> {
+    fn new(config: &'a Config, ci: &'a ComponentInterface) -> Self {
+        Self {
+            config,
+            ci,
+            include_once_names: RefCell::new(HashSet::new()),
+            imports: RefCell::new(BTreeSet::new()),
+        }
+    }
+
+    // The following methods are used by the `Types.swift` macros.
+
+    // Helper for the including a template, but only once.
+    //
+    // The first time this is called with a name it will return true, indicating that we should
+    // include the template.  Subsequent calls will return false.
+    fn include_once_check(&self, name: &str) -> bool {
+        self.include_once_names
+            .borrow_mut()
+            .insert(name.to_string())
+    }
+
+    // Helper to add an import statement
+    //
+    // Call this inside your template to cause an import statement to be added at the top of the
+    // file.  Imports will be sorted and de-deuped.
+    //
+    // Returns an empty string so that it can be used inside an askama `{{ }}` block.
+    fn add_import(&self, name: &str) -> &str {
+        self.imports.borrow_mut().insert(name.to_owned());
+        ""
+    }
+}
+
+/// Template for generating the `.h` file that defines the low-level C FFI.
+///
+/// This file defines only the low-level structs and functions that are exposed
+/// by the compiled Rust code. It gets wrapped into a higher-level API by the
+/// code from [`SwiftWrapper`].
+#[derive(Template)]
+#[template(syntax = "c", escape = "none", path = "BridgingHeaderTemplate.h")]
+pub struct BridgingHeader<'config, 'ci> {
+    _config: &'config Config,
+    ci: &'ci ComponentInterface,
+}
+
+impl<'config, 'ci> BridgingHeader<'config, 'ci> {
+    pub fn new(config: &'config Config, ci: &'ci ComponentInterface) -> Self {
+        Self {
+            _config: config,
+            ci,
+        }
+    }
+}
+
+/// Template for generating the `.modulemap` file that exposes the low-level C FFI.
+///
+/// This file defines how the low-level C FFI from [`BridgingHeader`] gets exposed
+/// as a Swift module that can be called by other Swift code. In our case, its only
+/// job is to define the *name* of the Swift module that will contain the FFI functions
+/// so that it can be imported by the higher-level code in from [`SwiftWrapper`].
+#[derive(Template)]
+#[template(syntax = "c", escape = "none", path = "ModuleMapTemplate.modulemap")]
+pub struct ModuleMap<'config, 'ci> {
+    config: &'config Config,
+    _ci: &'ci ComponentInterface,
+}
+
+impl<'config, 'ci> ModuleMap<'config, 'ci> {
+    pub fn new(config: &'config Config, _ci: &'ci ComponentInterface) -> Self {
+        Self { config, _ci }
+    }
+}
+
+#[derive(Template)]
+#[template(syntax = "swift", escape = "none", path = "wrapper.swift")]
+pub struct SwiftWrapper<'a> {
+    config: Config,
+    ci: &'a ComponentInterface,
+    type_helper_code: String,
+    type_imports: BTreeSet<String>,
+    has_async_fns: bool,
+}
+impl<'a> SwiftWrapper<'a> {
+    pub fn new(config: Config, ci: &'a ComponentInterface) -> Self {
+        let type_renderer = TypeRenderer::new(&config, ci);
+        let type_helper_code = type_renderer.render().unwrap();
+        let type_imports = type_renderer.imports.into_inner();
+        Self {
+            config,
+            ci,
+            type_helper_code,
+            type_imports,
+            has_async_fns: ci.has_async_fns(),
+        }
+    }
+
+    pub fn imports(&self) -> Vec<String> {
+        self.type_imports.iter().cloned().collect()
+    }
+
+    pub fn initialization_fns(&self) -> Vec<String> {
+        self.ci
+            .iter_types()
+            .map(|t| SwiftCodeOracle.find(t))
+            .filter_map(|ct| ct.initialization_fn())
+            .chain(
+                self.has_async_fns
+                    .then(|| "uniffiInitContinuationCallback".into()),
+            )
+            .collect()
+    }
+}
+
+#[derive(Clone)]
+pub struct SwiftCodeOracle;
+
+impl SwiftCodeOracle {
+    // Map `Type` instances to a `Box<dyn CodeType>` for that type.
+    //
+    // There is a companion match in `templates/Types.swift` which performs a similar function for the
+    // template code.
+    //
+    //   - When adding additional types here, make sure to also add a match arm to the `Types.swift` template.
+    //   - To keep things manageable, let's try to limit ourselves to these 2 mega-matches
+    fn create_code_type(&self, type_: Type) -> Box<dyn CodeType> {
+        match type_ {
+            Type::UInt8 => Box::new(primitives::UInt8CodeType),
+            Type::Int8 => Box::new(primitives::Int8CodeType),
+            Type::UInt16 => Box::new(primitives::UInt16CodeType),
+            Type::Int16 => Box::new(primitives::Int16CodeType),
+            Type::UInt32 => Box::new(primitives::UInt32CodeType),
+            Type::Int32 => Box::new(primitives::Int32CodeType),
+            Type::UInt64 => Box::new(primitives::UInt64CodeType),
+            Type::Int64 => Box::new(primitives::Int64CodeType),
+            Type::Float32 => Box::new(primitives::Float32CodeType),
+            Type::Float64 => Box::new(primitives::Float64CodeType),
+            Type::Boolean => Box::new(primitives::BooleanCodeType),
+            Type::String => Box::new(primitives::StringCodeType),
+            Type::Bytes => Box::new(primitives::BytesCodeType),
+
+            Type::Timestamp => Box::new(miscellany::TimestampCodeType),
+            Type::Duration => Box::new(miscellany::DurationCodeType),
+
+            Type::Enum { name, .. } => Box::new(enum_::EnumCodeType::new(name)),
+            Type::Object { name, .. } => Box::new(object::ObjectCodeType::new(name)),
+            Type::Record { name, .. } => Box::new(record::RecordCodeType::new(name)),
+            Type::CallbackInterface { name, .. } => {
+                Box::new(callback_interface::CallbackInterfaceCodeType::new(name))
+            }
+            Type::ForeignExecutor => Box::new(executor::ForeignExecutorCodeType),
+            Type::Optional { inner_type } => {
+                Box::new(compounds::OptionalCodeType::new(*inner_type))
+            }
+            Type::Sequence { inner_type } => {
+                Box::new(compounds::SequenceCodeType::new(*inner_type))
+            }
+            Type::Map {
+                key_type,
+                value_type,
+            } => Box::new(compounds::MapCodeType::new(*key_type, *value_type)),
+            Type::External { name, .. } => Box::new(external::ExternalCodeType::new(name)),
+            Type::Custom { name, .. } => Box::new(custom::CustomCodeType::new(name)),
+        }
+    }
+
+    fn find(&self, type_: &Type) -> Box<dyn CodeType> {
+        self.create_code_type(type_.clone())
+    }
+
+    /// Get the idiomatic Swift rendering of a class name (for enums, records, errors, etc).
+    fn class_name(&self, nm: &str) -> String {
+        nm.to_string().to_upper_camel_case()
+    }
+
+    /// Get the idiomatic Swift rendering of a function name.
+    fn fn_name(&self, nm: &str) -> String {
+        nm.to_string().to_lower_camel_case()
+    }
+
+    /// Get the idiomatic Swift rendering of a variable name.
+    fn var_name(&self, nm: &str) -> String {
+        nm.to_string().to_lower_camel_case()
+    }
+
+    /// Get the idiomatic Swift rendering of an individual enum variant.
+    fn enum_variant_name(&self, nm: &str) -> String {
+        nm.to_string().to_lower_camel_case()
+    }
+
+    fn ffi_type_label_raw(&self, ffi_type: &FfiType) -> String {
+        match ffi_type {
+            FfiType::Int8 => "Int8".into(),
+            FfiType::UInt8 => "UInt8".into(),
+            FfiType::Int16 => "Int16".into(),
+            FfiType::UInt16 => "UInt16".into(),
+            FfiType::Int32 => "Int32".into(),
+            FfiType::UInt32 => "UInt32".into(),
+            FfiType::Int64 => "Int64".into(),
+            FfiType::UInt64 => "UInt64".into(),
+            FfiType::Float32 => "Float".into(),
+            FfiType::Float64 => "Double".into(),
+            FfiType::RustArcPtr(_) => "UnsafeMutableRawPointer".into(),
+            FfiType::RustBuffer(_) => "RustBuffer".into(),
+            FfiType::ForeignBytes => "ForeignBytes".into(),
+            FfiType::ForeignCallback => "ForeignCallback".into(),
+            FfiType::ForeignExecutorHandle => "Int".into(),
+            FfiType::ForeignExecutorCallback => "ForeignExecutorCallback".into(),
+            FfiType::RustFutureContinuationCallback => "UniFfiRustFutureContinuation".into(),
+            FfiType::RustFutureHandle | FfiType::RustFutureContinuationData => {
+                "UnsafeMutableRawPointer".into()
+            }
+        }
+    }
+
+    fn ffi_type_label(&self, ffi_type: &FfiType) -> String {
+        match ffi_type {
+            FfiType::ForeignCallback
+            | FfiType::ForeignExecutorCallback
+            | FfiType::RustFutureHandle
+            | FfiType::RustFutureContinuationCallback
+            | FfiType::RustFutureContinuationData => {
+                format!("{} _Nonnull", self.ffi_type_label_raw(ffi_type))
+            }
+            _ => self.ffi_type_label_raw(ffi_type),
+        }
+    }
+
+    fn ffi_canonical_name(&self, ffi_type: &FfiType) -> String {
+        self.ffi_type_label_raw(ffi_type)
+    }
+}
+
+pub mod filters {
+    use super::*;
+    pub use crate::backend::filters::*;
+
+    fn oracle() -> &'static SwiftCodeOracle {
+        &SwiftCodeOracle
+    }
+
+    pub fn type_name(as_type: &impl AsType) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).type_label())
+    }
+
+    pub fn canonical_name(as_type: &impl AsType) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).canonical_name())
+    }
+
+    pub fn ffi_converter_name(as_type: &impl AsType) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).ffi_converter_name())
+    }
+
+    pub fn lower_fn(as_type: &impl AsType) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).lower())
+    }
+
+    pub fn write_fn(as_type: &impl AsType) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).write())
+    }
+
+    pub fn lift_fn(as_type: &impl AsType) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).lift())
+    }
+
+    pub fn read_fn(as_type: &impl AsType) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).read())
+    }
+
+    pub fn literal_swift(
+        literal: &Literal,
+        as_type: &impl AsType,
+    ) -> Result<String, askama::Error> {
+        Ok(oracle().find(&as_type.as_type()).literal(literal))
+    }
+
+    /// Get the Swift type for an FFIType
+    pub fn ffi_type_name(ffi_type: &FfiType) -> Result<String, askama::Error> {
+        Ok(oracle().ffi_type_label(ffi_type))
+    }
+
+    pub fn ffi_canonical_name(ffi_type: &FfiType) -> Result<String, askama::Error> {
+        Ok(oracle().ffi_canonical_name(ffi_type))
+    }
+
+    /// Like `ffi_type_name`, but used in `BridgingHeaderTemplate.h` which uses a slightly different
+    /// names.
+    pub fn header_ffi_type_name(ffi_type: &FfiType) -> Result<String, askama::Error> {
+        Ok(match ffi_type {
+            FfiType::Int8 => "int8_t".into(),
+            FfiType::UInt8 => "uint8_t".into(),
+            FfiType::Int16 => "int16_t".into(),
+            FfiType::UInt16 => "uint16_t".into(),
+            FfiType::Int32 => "int32_t".into(),
+            FfiType::UInt32 => "uint32_t".into(),
+            FfiType::Int64 => "int64_t".into(),
+            FfiType::UInt64 => "uint64_t".into(),
+            FfiType::Float32 => "float".into(),
+            FfiType::Float64 => "double".into(),
+            FfiType::RustArcPtr(_) => "void*_Nonnull".into(),
+            FfiType::RustBuffer(_) => "RustBuffer".into(),
+            FfiType::ForeignBytes => "ForeignBytes".into(),
+            FfiType::ForeignCallback => "ForeignCallback _Nonnull".into(),
+            FfiType::ForeignExecutorCallback => "UniFfiForeignExecutorCallback _Nonnull".into(),
+            FfiType::ForeignExecutorHandle => "size_t".into(),
+            FfiType::RustFutureContinuationCallback => {
+                "UniFfiRustFutureContinuation _Nonnull".into()
+            }
+            FfiType::RustFutureHandle | FfiType::RustFutureContinuationData => {
+                "void* _Nonnull".into()
+            }
+        })
+    }
+
+    /// Get the idiomatic Swift rendering of a class name (for enums, records, errors, etc).
+    pub fn class_name(nm: &str) -> Result<String, askama::Error> {
+        Ok(oracle().class_name(nm))
+    }
+
+    /// Get the idiomatic Swift rendering of a function name.
+    pub fn fn_name(nm: &str) -> Result<String, askama::Error> {
+        Ok(quote_general_keyword(oracle().fn_name(nm)))
+    }
+
+    /// Get the idiomatic Swift rendering of a variable name.
+    pub fn var_name(nm: &str) -> Result<String, askama::Error> {
+        Ok(quote_general_keyword(oracle().var_name(nm)))
+    }
+
+    /// Get the idiomatic Swift rendering of an arguments name.
+    /// This is the same as the var name but quoting is not required.
+    pub fn arg_name(nm: &str) -> Result<String, askama::Error> {
+        Ok(quote_arg_keyword(oracle().var_name(nm)))
+    }
+
+    /// Get the idiomatic Swift rendering of an individual enum variant, quoted if it is a keyword (for use in e.g. declarations)
+    pub fn enum_variant_swift_quoted(nm: &str) -> Result<String, askama::Error> {
+        Ok(quote_general_keyword(oracle().enum_variant_name(nm)))
+    }
+
+    /// Get the idiomatic Swift rendering of an individual enum variant, for contexts (for use in non-declaration contexts where quoting is not needed)
+    pub fn enum_variant_swift(nm: &str) -> Result<String, askama::Error> {
+        Ok(oracle().enum_variant_name(nm))
+    }
+
+    pub fn error_handler(result: &ResultType) -> Result<String, askama::Error> {
+        Ok(match &result.throws_type {
+            Some(t) => format!("{}.lift", ffi_converter_name(t)?),
+            None => "nil".into(),
+        })
+    }
+
+    /// Name of the callback function to handle an async result
+    pub fn future_callback(result: &ResultType) -> Result<String, askama::Error> {
+        Ok(format!(
+            "uniffiFutureCallbackHandler{}{}",
+            match &result.return_type {
+                Some(t) => SwiftCodeOracle.find(t).canonical_name(),
+                None => "Void".into(),
+            },
+            match &result.throws_type {
+                Some(t) => SwiftCodeOracle.find(t).canonical_name(),
+                None => "".into(),
+            }
+        ))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/object.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/object.rs
new file mode 100644
index 0000000000..ea140c998d
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/object.rs
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+
+#[derive(Debug)]
+pub struct ObjectCodeType {
+    id: String,
+}
+
+impl ObjectCodeType {
+    pub fn new(id: String) -> Self {
+        Self { id }
+    }
+}
+
+impl CodeType for ObjectCodeType {
+    fn type_label(&self) -> String {
+        super::SwiftCodeOracle.class_name(&self.id)
+    }
+
+    fn canonical_name(&self) -> String {
+        format!("Type{}", self.id)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/primitives.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/primitives.rs
new file mode 100644
index 0000000000..86424658a3
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/primitives.rs
@@ -0,0 +1,91 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+use crate::backend::Literal;
+use crate::interface::{Radix, Type};
+use paste::paste;
+
+fn render_literal(literal: &Literal) -> String {
+    fn typed_number(type_: &Type, num_str: String) -> String {
+        match type_ {
+            // special case Int32.
+            Type::Int32 => num_str,
+            // otherwise use constructor e.g. UInt8(x)
+            Type::Int8
+            | Type::UInt8
+            | Type::Int16
+            | Type::UInt16
+            | Type::UInt32
+            | Type::Int64
+            | Type::UInt64
+            | Type::Float32
+            | Type::Float64 =>
+            // XXX we should pass in the codetype itself.
+            {
+                format!(
+                    "{}({num_str})",
+                    super::SwiftCodeOracle.find(type_).type_label()
+                )
+            }
+            _ => panic!("Unexpected literal: {num_str} is not a number"),
+        }
+    }
+
+    match literal {
+        Literal::Boolean(v) => format!("{v}"),
+        Literal::String(s) => format!("\"{s}\""),
+        Literal::Int(i, radix, type_) => typed_number(
+            type_,
+            match radix {
+                Radix::Octal => format!("0o{i:o}"),
+                Radix::Decimal => format!("{i}"),
+                Radix::Hexadecimal => format!("{i:#x}"),
+            },
+        ),
+        Literal::UInt(i, radix, type_) => typed_number(
+            type_,
+            match radix {
+                Radix::Octal => format!("0o{i:o}"),
+                Radix::Decimal => format!("{i}"),
+                Radix::Hexadecimal => format!("{i:#x}"),
+            },
+        ),
+        Literal::Float(string, type_) => typed_number(type_, string.clone()),
+        _ => unreachable!("Literal"),
+    }
+}
+
+macro_rules! impl_code_type_for_primitive {
+    ($T:ty, $class_name:literal) => {
+        paste! {
+            #[derive(Debug)]
+            pub struct $T;
+
+            impl CodeType for $T  {
+                fn type_label(&self) -> String {
+                    $class_name.into()
+                }
+
+                fn literal(&self, literal: &Literal) -> String {
+                    render_literal(&literal)
+                }
+            }
+        }
+    };
+}
+
+impl_code_type_for_primitive!(BooleanCodeType, "Bool");
+impl_code_type_for_primitive!(StringCodeType, "String");
+impl_code_type_for_primitive!(BytesCodeType, "Data");
+impl_code_type_for_primitive!(Int8CodeType, "Int8");
+impl_code_type_for_primitive!(Int16CodeType, "Int16");
+impl_code_type_for_primitive!(Int32CodeType, "Int32");
+impl_code_type_for_primitive!(Int64CodeType, "Int64");
+impl_code_type_for_primitive!(UInt8CodeType, "UInt8");
+impl_code_type_for_primitive!(UInt16CodeType, "UInt16");
+impl_code_type_for_primitive!(UInt32CodeType, "UInt32");
+impl_code_type_for_primitive!(UInt64CodeType, "UInt64");
+impl_code_type_for_primitive!(Float32CodeType, "Float");
+impl_code_type_for_primitive!(Float64CodeType, "Double");
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/record.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/record.rs
new file mode 100644
index 0000000000..401109011f
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/gen_swift/record.rs
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use super::CodeType;
+
+#[derive(Debug)]
+pub struct RecordCodeType {
+    id: String,
+}
+
+impl RecordCodeType {
+    pub fn new(id: String) -> Self {
+        Self { id }
+    }
+}
+
+impl CodeType for RecordCodeType {
+    fn type_label(&self) -> String {
+        super::SwiftCodeOracle.class_name(&self.id)
+    }
+
+    fn canonical_name(&self) -> String {
+        format!("Type{}", self.id)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/mod.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/mod.rs
new file mode 100644
index 0000000000..bf17f38a4e
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/mod.rs
@@ -0,0 +1,97 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! # Swift bindings backend for UniFFI
+//!
+//! This module generates Swift bindings from a [`ComponentInterface`] definition,
+//! using Swift's builtin support for loading C header files.
+//!
+//! Conceptually, the generated bindings are split into two Swift modules, one for the low-level
+//! C FFI layer and one for the higher-level Swift bindings. For a UniFFI component named "example"
+//! we generate:
+//!
+//!   * A C header file `exampleFFI.h` declaring the low-level structs and functions for calling
+//!    into Rust, along with a corresponding `exampleFFI.modulemap` to expose them to Swift.
+//!
+//!   * A Swift source file `example.swift` that imports the `exampleFFI` module and wraps it
+//!    to provide the higher-level Swift API.
+//!
+//! Most of the concepts in a [`ComponentInterface`] have an obvious counterpart in Swift,
+//! with the details documented in inline comments where appropriate.
+//!
+//! To handle lifting/lowering/serializing types across the FFI boundary, the Swift code
+//! defines a `protocol ViaFfi` that is analogous to the `uniffi::ViaFfi` Rust trait.
+//! Each type that can traverse the FFI conforms to the `ViaFfi` protocol, which specifies:
+//!
+//!  * The corresponding low-level type.
+//!  * How to lift from and lower into into that type.
+//!  * How to read from and write into a byte buffer.
+//!
+
+use std::process::Command;
+
+use anyhow::Result;
+use camino::Utf8Path;
+use fs_err as fs;
+
+pub mod gen_swift;
+pub use gen_swift::{generate_bindings, Config};
+mod test;
+
+use super::super::interface::ComponentInterface;
+pub use test::{run_script, run_test};
+
+/// The Swift bindings generated from a [`ComponentInterface`].
+///
+pub struct Bindings {
+    /// The contents of the generated `.swift` file, as a string.
+    library: String,
+    /// The contents of the generated `.h` file, as a string.
+    header: String,
+    /// The contents of the generated `.modulemap` file, as a string.
+    modulemap: Option<String>,
+}
+
+/// Write UniFFI component bindings for Swift as files on disk.
+///
+/// Unlike other target languages, binding to Rust code from Swift involves more than just
+/// generating a `.swift` file. We also need to produce a `.h` file with the C-level API
+/// declarations, and a `.modulemap` file to tell Swift how to use it.
+pub fn write_bindings(
+    config: &Config,
+    ci: &ComponentInterface,
+    out_dir: &Utf8Path,
+    try_format_code: bool,
+) -> Result<()> {
+    let Bindings {
+        header,
+        library,
+        modulemap,
+    } = generate_bindings(config, ci)?;
+
+    let source_file = out_dir.join(format!("{}.swift", config.module_name()));
+    fs::write(&source_file, library)?;
+
+    let header_file = out_dir.join(config.header_filename());
+    fs::write(header_file, header)?;
+
+    if let Some(modulemap) = modulemap {
+        let modulemap_file = out_dir.join(config.modulemap_filename());
+        fs::write(modulemap_file, modulemap)?;
+    }
+
+    if try_format_code {
+        if let Err(e) = Command::new("swiftformat")
+            .arg(source_file.as_str())
+            .output()
+        {
+            println!(
+                "Warning: Unable to auto-format {} using swiftformat: {e:?}",
+                source_file.file_name().unwrap(),
+            );
+        }
+    }
+
+    Ok(())
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Async.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Async.swift
new file mode 100644
index 0000000000..695208861d
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Async.swift
@@ -0,0 +1,62 @@
+private let UNIFFI_RUST_FUTURE_POLL_READY: Int8 = 0
+private let UNIFFI_RUST_FUTURE_POLL_MAYBE_READY: Int8 = 1
+
+fileprivate func uniffiRustCallAsync<F, T>(
+    rustFutureFunc: () -> UnsafeMutableRawPointer,
+    pollFunc: (UnsafeMutableRawPointer, UnsafeMutableRawPointer) -> (),
+    completeFunc: (UnsafeMutableRawPointer, UnsafeMutablePointer<RustCallStatus>) -> F,
+    freeFunc: (UnsafeMutableRawPointer) -> (),
+    liftFunc: (F) throws -> T,
+    errorHandler: ((RustBuffer) throws -> Error)?
+) async throws -> T {
+    // Make sure to call uniffiEnsureInitialized() since future creation doesn't have a
+    // RustCallStatus param, so doesn't use makeRustCall()
+    uniffiEnsureInitialized()
+    let rustFuture = rustFutureFunc()
+    defer {
+        freeFunc(rustFuture)
+    }
+    var pollResult: Int8;
+    repeat {
+        pollResult = await withUnsafeContinuation {
+            pollFunc(rustFuture, ContinuationHolder($0).toOpaque())
+        }
+    } while pollResult != UNIFFI_RUST_FUTURE_POLL_READY
+
+    return try liftFunc(makeRustCall(
+        { completeFunc(rustFuture, $0) },
+        errorHandler: errorHandler
+    ))
+}
+
+// Callback handlers for an async calls.  These are invoked by Rust when the future is ready.  They
+// lift the return value or error and resume the suspended function.
+fileprivate func uniffiFutureContinuationCallback(ptr: UnsafeMutableRawPointer, pollResult: Int8) {
+    ContinuationHolder.fromOpaque(ptr).resume(pollResult)
+}
+
+// Wraps UnsafeContinuation in a class so that we can use reference counting when passing it across
+// the FFI
+fileprivate class ContinuationHolder {
+    let continuation: UnsafeContinuation<Int8, Never>
+
+    init(_ continuation: UnsafeContinuation<Int8, Never>) {
+        self.continuation = continuation
+    }
+
+    func resume(_ pollResult: Int8) {
+        self.continuation.resume(returning: pollResult)
+    }
+
+    func toOpaque() -> UnsafeMutableRawPointer {
+        return Unmanaged<ContinuationHolder>.passRetained(self).toOpaque()
+    }
+
+    static func fromOpaque(_ ptr: UnsafeRawPointer) -> ContinuationHolder {
+        return Unmanaged<ContinuationHolder>.fromOpaque(ptr).takeRetainedValue()
+    }
+}
+
+fileprivate func uniffiInitContinuationCallback() {
+    {{ ci.ffi_rust_future_continuation_callback_set().name() }}(uniffiFutureContinuationCallback)
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/BooleanHelper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/BooleanHelper.swift
new file mode 100644
index 0000000000..465e519628
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/BooleanHelper.swift
@@ -0,0 +1,20 @@
+fileprivate struct FfiConverterBool : FfiConverter {
+    typealias FfiType = Int8
+    typealias SwiftType = Bool
+
+    public static func lift(_ value: Int8) throws -> Bool {
+        return value != 0
+    }
+
+    public static func lower(_ value: Bool) -> Int8 {
+        return value ? 1 : 0
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Bool {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: Bool, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/BridgingHeaderTemplate.h b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/BridgingHeaderTemplate.h
new file mode 100644
index 0000000000..87698e359f
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/BridgingHeaderTemplate.h
@@ -0,0 +1,79 @@
+// This file was autogenerated by some hot garbage in the `uniffi` crate.
+// Trust me, you don't want to mess with it!
+
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+// The following structs are used to implement the lowest level
+// of the FFI, and thus useful to multiple uniffied crates.
+// We ensure they are declared exactly once, with a header guard, UNIFFI_SHARED_H.
+#ifdef UNIFFI_SHARED_H
+    // We also try to prevent mixing versions of shared uniffi header structs.
+    // If you add anything to the #else block, you must increment the version suffix in UNIFFI_SHARED_HEADER_V4
+    #ifndef UNIFFI_SHARED_HEADER_V4
+        #error Combining helper code from multiple versions of uniffi is not supported
+    #endif // ndef UNIFFI_SHARED_HEADER_V4
+#else
+#define UNIFFI_SHARED_H
+#define UNIFFI_SHARED_HEADER_V4
+// ⚠️ Attention: If you change this #else block (ending in `#endif // def UNIFFI_SHARED_H`) you *must* ⚠️
+// ⚠️ increment the version suffix in all instances of UNIFFI_SHARED_HEADER_V4 in this file.           ⚠️
+
+typedef struct RustBuffer
+{
+    int32_t capacity;
+    int32_t len;
+    uint8_t *_Nullable data;
+} RustBuffer;
+
+typedef int32_t (*ForeignCallback)(uint64_t, int32_t, const uint8_t *_Nonnull, int32_t, RustBuffer *_Nonnull);
+
+// Task defined in Rust that Swift executes
+typedef void (*UniFfiRustTaskCallback)(const void * _Nullable, int8_t);
+
+// Callback to execute Rust tasks using a Swift Task
+//
+// Args:
+//   executor: ForeignExecutor lowered into a size_t value
+//   delay: Delay in MS
+//   task: UniFfiRustTaskCallback to call
+//   task_data: data to pass the task callback
+typedef int8_t (*UniFfiForeignExecutorCallback)(size_t, uint32_t, UniFfiRustTaskCallback _Nullable, const void * _Nullable);
+
+typedef struct ForeignBytes
+{
+    int32_t len;
+    const uint8_t *_Nullable data;
+} ForeignBytes;
+
+// Error definitions
+typedef struct RustCallStatus {
+    int8_t code;
+    RustBuffer errorBuf;
+} RustCallStatus;
+
+// ⚠️ Attention: If you change this #else block (ending in `#endif // def UNIFFI_SHARED_H`) you *must* ⚠️
+// ⚠️ increment the version suffix in all instances of UNIFFI_SHARED_HEADER_V4 in this file.           ⚠️
+#endif // def UNIFFI_SHARED_H
+
+// Continuation callback for UniFFI Futures
+typedef void (*UniFfiRustFutureContinuation)(void * _Nonnull, int8_t);
+
+// Scaffolding functions
+{%- for func in ci.iter_ffi_function_definitions() %}
+{% match func.return_type() -%}{%- when Some with (type_) %}{{ type_|header_ffi_type_name }}{% when None %}void{% endmatch %} {{ func.name() }}(
+    {%- if func.arguments().len() > 0 %}
+        {%- for arg in func.arguments() %}
+            {{- arg.type_().borrow()|header_ffi_type_name }} {{ arg.name() -}}{% if !loop.last || func.has_rust_call_status_arg() %}, {% endif %}
+        {%- endfor %}
+        {%- if func.has_rust_call_status_arg() %}RustCallStatus *_Nonnull out_status{% endif %}
+    {%- else %}
+        {%- if func.has_rust_call_status_arg() %}RustCallStatus *_Nonnull out_status{%- else %}void{% endif %}
+    {% endif %}
+);
+{%- endfor %}
+
+{% import "macros.swift" as swift %}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CallbackInterfaceRuntime.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CallbackInterfaceRuntime.swift
new file mode 100644
index 0000000000..9ae62d1667
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CallbackInterfaceRuntime.swift
@@ -0,0 +1,64 @@
+fileprivate extension NSLock {
+    func withLock<T>(f: () throws -> T) rethrows -> T {
+        self.lock()
+        defer { self.unlock() }
+        return try f()
+    }
+}
+
+fileprivate typealias UniFFICallbackHandle = UInt64
+fileprivate class UniFFICallbackHandleMap<T> {
+    private var leftMap: [UniFFICallbackHandle: T] = [:]
+    private var counter: [UniFFICallbackHandle: UInt64] = [:]
+    private var rightMap: [ObjectIdentifier: UniFFICallbackHandle] = [:]
+
+    private let lock = NSLock()
+    private var currentHandle: UniFFICallbackHandle = 0
+    private let stride: UniFFICallbackHandle = 1
+
+    func insert(obj: T) -> UniFFICallbackHandle {
+        lock.withLock {
+            let id = ObjectIdentifier(obj as AnyObject)
+            let handle = rightMap[id] ?? {
+                currentHandle += stride
+                let handle = currentHandle
+                leftMap[handle] = obj
+                rightMap[id] = handle
+                return handle
+            }()
+            counter[handle] = (counter[handle] ?? 0) + 1
+            return handle
+        }
+    }
+
+    func get(handle: UniFFICallbackHandle) -> T? {
+        lock.withLock {
+            leftMap[handle]
+        }
+    }
+
+    func delete(handle: UniFFICallbackHandle) {
+        remove(handle: handle)
+    }
+
+    @discardableResult
+    func remove(handle: UniFFICallbackHandle) -> T? {
+        lock.withLock {
+            defer { counter[handle] = (counter[handle] ?? 1) - 1 }
+            guard counter[handle] == 1 else { return leftMap[handle] }
+            let obj = leftMap.removeValue(forKey: handle)
+            if let obj = obj {
+                rightMap.removeValue(forKey: ObjectIdentifier(obj as AnyObject))
+            }
+            return obj
+        }
+    }
+}
+
+// Magic number for the Rust proxy to call using the same mechanism as every other method,
+// to free the callback once it's dropped by Rust.
+private let IDX_CALLBACK_FREE: Int32 = 0
+// Callback return codes
+private let UNIFFI_CALLBACK_SUCCESS: Int32 = 0
+private let UNIFFI_CALLBACK_ERROR: Int32 = 1
+private let UNIFFI_CALLBACK_UNEXPECTED_ERROR: Int32 = 2
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CallbackInterfaceTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CallbackInterfaceTemplate.swift
new file mode 100644
index 0000000000..aec8ded930
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CallbackInterfaceTemplate.swift
@@ -0,0 +1,150 @@
+{%- let cbi = ci|get_callback_interface_definition(name) %}
+{%- let foreign_callback = format!("foreignCallback{}", canonical_type_name) %}
+{%- if self.include_once_check("CallbackInterfaceRuntime.swift") %}{%- include "CallbackInterfaceRuntime.swift" %}{%- endif %}
+
+// Declaration and FfiConverters for {{ type_name }} Callback Interface
+
+public protocol {{ type_name }} : AnyObject {
+    {% for meth in cbi.methods() -%}
+    func {{ meth.name()|fn_name }}({% call swift::arg_list_protocol(meth) %}) {% call swift::throws(meth) -%}
+    {%- match meth.return_type() -%}
+    {%- when Some with (return_type) %} -> {{ return_type|type_name -}}
+    {%- else -%}
+    {%- endmatch %}
+    {% endfor %}
+}
+
+// The ForeignCallback that is passed to Rust.
+fileprivate let {{ foreign_callback }} : ForeignCallback =
+    { (handle: UniFFICallbackHandle, method: Int32, argsData: UnsafePointer<UInt8>, argsLen: Int32, out_buf: UnsafeMutablePointer<RustBuffer>) -> Int32 in
+    {% for meth in cbi.methods() -%}
+    {%- let method_name = format!("invoke_{}", meth.name())|fn_name %}
+
+    func {{ method_name }}(_ swiftCallbackInterface: {{ type_name }}, _ argsData: UnsafePointer<UInt8>, _ argsLen: Int32, _ out_buf: UnsafeMutablePointer<RustBuffer>) throws -> Int32 {
+        {%- if meth.arguments().len() > 0 %}
+        var reader = createReader(data: Data(bytes: argsData, count: Int(argsLen)))
+        {%- endif %}
+
+        {%- match meth.return_type() %}
+        {%- when Some(return_type) %}
+        func makeCall() throws -> Int32 {
+            let result = {% if meth.throws() %} try{% endif %} swiftCallbackInterface.{{ meth.name()|fn_name }}(
+                    {% for arg in meth.arguments() -%}
+                    {% if !config.omit_argument_labels() %}{{ arg.name()|var_name }}: {% endif %} try {{ arg|read_fn }}(from: &reader)
+                    {%- if !loop.last %}, {% endif %}
+                    {% endfor -%}
+                )
+            var writer = [UInt8]()
+            {{ return_type|write_fn }}(result, into: &writer)
+            out_buf.pointee = RustBuffer(bytes: writer)
+            return UNIFFI_CALLBACK_SUCCESS
+        }
+        {%- when None %}
+        func makeCall() throws -> Int32 {
+            try swiftCallbackInterface.{{ meth.name()|fn_name }}(
+                    {% for arg in meth.arguments() -%}
+                    {% if !config.omit_argument_labels() %}{{ arg.name()|var_name }}: {% endif %} try {{ arg|read_fn }}(from: &reader)
+                    {%- if !loop.last %}, {% endif %}
+                    {% endfor -%}
+                )
+            return UNIFFI_CALLBACK_SUCCESS
+        }
+        {%- endmatch %}
+
+        {%- match meth.throws_type() %}
+        {%- when None %}
+        return try makeCall()
+        {%- when Some(error_type) %}
+        do {
+            return try makeCall()
+        } catch let error as {{ error_type|type_name }} {
+            out_buf.pointee = {{ error_type|lower_fn }}(error)
+            return UNIFFI_CALLBACK_ERROR
+        }
+        {%- endmatch %}
+    }
+    {%- endfor %}
+
+
+    switch method {
+        case IDX_CALLBACK_FREE:
+            {{ ffi_converter_name }}.drop(handle: handle)
+            // Sucessful return
+            // See docs of ForeignCallback in `uniffi_core/src/ffi/foreigncallbacks.rs`
+            return UNIFFI_CALLBACK_SUCCESS
+        {% for meth in cbi.methods() -%}
+        {% let method_name = format!("invoke_{}", meth.name())|fn_name -%}
+        case {{ loop.index }}:
+            let cb: {{ cbi|type_name }}
+            do {
+                cb = try {{ ffi_converter_name }}.lift(handle)
+            } catch {
+                out_buf.pointee = {{ Type::String.borrow()|lower_fn }}("{{ cbi.name() }}: Invalid handle")
+                return UNIFFI_CALLBACK_UNEXPECTED_ERROR
+            }
+            do {
+                return try {{ method_name }}(cb, argsData, argsLen, out_buf)
+            } catch let error {
+                out_buf.pointee = {{ Type::String.borrow()|lower_fn }}(String(describing: error))
+                return UNIFFI_CALLBACK_UNEXPECTED_ERROR
+            }
+        {% endfor %}
+        // This should never happen, because an out of bounds method index won't
+        // ever be used. Once we can catch errors, we should return an InternalError.
+        // https://github.com/mozilla/uniffi-rs/issues/351
+        default:
+            // An unexpected error happened.
+            // See docs of ForeignCallback in `uniffi_core/src/ffi/foreigncallbacks.rs`
+            return UNIFFI_CALLBACK_UNEXPECTED_ERROR
+    }
+}
+
+// FfiConverter protocol for callback interfaces
+fileprivate struct {{ ffi_converter_name }} {
+    private static let initCallbackOnce: () = {
+        // Swift ensures this initializer code will once run once, even when accessed by multiple threads.
+        try! rustCall { (err: UnsafeMutablePointer<RustCallStatus>) in
+            {{ cbi.ffi_init_callback().name() }}({{ foreign_callback }}, err)
+        }
+    }()
+
+    private static func ensureCallbackinitialized() {
+        _ = initCallbackOnce
+    }
+
+    static func drop(handle: UniFFICallbackHandle) {
+        handleMap.remove(handle: handle)
+    }
+
+    private static var handleMap = UniFFICallbackHandleMap<{{ type_name }}>()
+}
+
+extension {{ ffi_converter_name }} : FfiConverter {
+    typealias SwiftType = {{ type_name }}
+    // We can use Handle as the FfiType because it's a typealias to UInt64
+    typealias FfiType = UniFFICallbackHandle
+
+    public static func lift(_ handle: UniFFICallbackHandle) throws -> SwiftType {
+        ensureCallbackinitialized();
+        guard let callback = handleMap.get(handle: handle) else {
+            throw UniffiInternalError.unexpectedStaleHandle
+        }
+        return callback
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> SwiftType {
+        ensureCallbackinitialized();
+        let handle: UniFFICallbackHandle = try readInt(&buf)
+        return try lift(handle)
+    }
+
+    public static func lower(_ v: SwiftType) -> UniFFICallbackHandle {
+        ensureCallbackinitialized();
+        return handleMap.insert(obj: v)
+    }
+
+    public static func write(_ v: SwiftType, into buf: inout [UInt8]) {
+        ensureCallbackinitialized();
+        writeInt(&buf, lower(v))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CustomType.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CustomType.swift
new file mode 100644
index 0000000000..504cadfc1d
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CustomType.swift
@@ -0,0 +1,86 @@
+{%- let ffi_type_name=builtin|ffi_type|ffi_type_name %}
+{%- match config.custom_types.get(name.as_str())  %}
+{%- when None %}
+{#- No config, just forward all methods to our builtin type #}
+/**
+ * Typealias from the type name used in the UDL file to the builtin type.  This
+ * is needed because the UDL type name is used in function/method signatures.
+ */
+public typealias {{ name }} = {{ builtin|type_name }}
+public struct FfiConverterType{{ name }}: FfiConverter {
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ name }} {
+        return try {{ builtin|read_fn }}(from: &buf)
+    }
+
+    public static func write(_ value: {{ name }}, into buf: inout [UInt8]) {
+        return {{ builtin|write_fn }}(value, into: &buf)
+    }
+
+    public static func lift(_ value: {{ ffi_type_name }}) throws -> {{ name }} {
+        return try {{ builtin|lift_fn }}(value)
+    }
+
+    public static func lower(_ value: {{ name }}) -> {{ ffi_type_name }} {
+        return {{ builtin|lower_fn }}(value)
+    }
+}
+
+{%- when Some with (config) %}
+
+{# When the config specifies a different type name, create a typealias for it #}
+{%- match config.type_name %}
+{%- when Some with (concrete_type_name) %}
+/**
+ * Typealias from the type name used in the UDL file to the custom type.  This
+ * is needed because the UDL type name is used in function/method signatures.
+ */
+public typealias {{ name }} = {{ concrete_type_name }}
+{%- else %}
+{%- endmatch %}
+
+{%- match config.imports %}
+{%- when Some(imports) %}
+{%- for import_name in imports %}
+{{ self.add_import(import_name) }}
+{%- endfor %}
+{%- else %}
+{%- endmatch %}
+
+public struct FfiConverterType{{ name }}: FfiConverter {
+    {#- Custom type config supplied, use it to convert the builtin type #}
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ name }} {
+        let builtinValue = try {{ builtin|read_fn }}(from: &buf)
+        return {{ config.into_custom.render("builtinValue") }}
+    }
+
+    public static func write(_ value: {{ name }}, into buf: inout [UInt8]) {
+        let builtinValue = {{ config.from_custom.render("value") }}
+        return {{ builtin|write_fn }}(builtinValue, into: &buf)
+    }
+
+    public static func lift(_ value: {{ ffi_type_name }}) throws -> {{ name }} {
+        let builtinValue = try {{ builtin|lift_fn }}(value)
+        return {{ config.into_custom.render("builtinValue") }}
+    }
+
+    public static func lower(_ value: {{ name }}) -> {{ ffi_type_name }} {
+        let builtinValue = {{ config.from_custom.render("value") }}
+        return {{ builtin|lower_fn }}(builtinValue)
+    }
+}
+
+{%- endmatch %}
+
+{#
+We always write these public functions just incase the type is used as
+an external type by another crate.
+#}
+public func FfiConverterType{{ name }}_lift(_ value: {{ ffi_type_name }}) throws -> {{ name }} {
+    return try FfiConverterType{{ name }}.lift(value)
+}
+
+public func FfiConverterType{{ name }}_lower(_ value: {{ name }}) -> {{ ffi_type_name }} {
+    return FfiConverterType{{ name }}.lower(value)
+}
+
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DataHelper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DataHelper.swift
new file mode 100644
index 0000000000..7db240bf9c
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DataHelper.swift
@@ -0,0 +1,14 @@
+fileprivate struct FfiConverterData: FfiConverterRustBuffer {
+    typealias SwiftType = Data
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Data {
+        let len: Int32 = try readInt(&buf)
+        return Data(try readBytes(&buf, count: Int(len)))
+    }
+
+    public static func write(_ value: Data, into buf: inout [UInt8]) {
+        let len = Int32(value.count)
+        writeInt(&buf, len)
+        writeBytes(&buf, value)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DurationHelper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DurationHelper.swift
new file mode 100644
index 0000000000..c2aa49e9d1
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DurationHelper.swift
@@ -0,0 +1,24 @@
+fileprivate struct FfiConverterDuration: FfiConverterRustBuffer {
+    typealias SwiftType = TimeInterval
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> TimeInterval {
+        let seconds: UInt64 = try readInt(&buf)
+        let nanoseconds: UInt32 = try readInt(&buf)
+        return Double(seconds) + (Double(nanoseconds) / 1.0e9)
+    }
+
+    public static func write(_ value: TimeInterval, into buf: inout [UInt8]) {
+        if value.rounded(.down) > Double(Int64.max) {
+            fatalError("Duration overflow, exceeds max bounds supported by Uniffi")
+        }
+
+        if value < 0 {
+            fatalError("Invalid duration, must be non-negative")
+        }
+
+        let seconds = UInt64(value)
+        let nanoseconds = UInt32((value - Double(seconds)) * 1.0e9)
+        writeInt(&buf, seconds)
+        writeInt(&buf, nanoseconds)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/EnumTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/EnumTemplate.swift
new file mode 100644
index 0000000000..99f45290cc
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/EnumTemplate.swift
@@ -0,0 +1,59 @@
+// Note that we don't yet support `indirect` for enums.
+// See https://github.com/mozilla/uniffi-rs/issues/396 for further discussion.
+public enum {{ type_name }} {
+    {% for variant in e.variants() %}
+    case {{ variant.name()|enum_variant_swift_quoted }}{% if variant.fields().len() > 0 %}({% call swift::field_list_decl(variant) %}){% endif -%}
+    {% endfor %}
+}
+
+public struct {{ ffi_converter_name }}: FfiConverterRustBuffer {
+    typealias SwiftType = {{ type_name }}
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ type_name }} {
+        let variant: Int32 = try readInt(&buf)
+        switch variant {
+        {% for variant in e.variants() %}
+        case {{ loop.index }}: return .{{ variant.name()|enum_variant_swift_quoted }}{% if variant.has_fields() %}(
+            {%- for field in variant.fields() %}
+            {{ field.name()|arg_name }}: try {{ field|read_fn }}(from: &buf)
+            {%- if !loop.last %}, {% endif %}
+            {%- endfor %}
+        ){%- endif %}
+        {% endfor %}
+        default: throw UniffiInternalError.unexpectedEnumCase
+        }
+    }
+
+    public static func write(_ value: {{ type_name }}, into buf: inout [UInt8]) {
+        switch value {
+        {% for variant in e.variants() %}
+        {% if variant.has_fields() %}
+        case let .{{ variant.name()|enum_variant_swift_quoted }}({% for field in variant.fields() %}{{ field.name()|var_name }}{%- if loop.last -%}{%- else -%},{%- endif -%}{% endfor %}):
+            writeInt(&buf, Int32({{ loop.index }}))
+            {% for field in variant.fields() -%}
+            {{ field|write_fn }}({{ field.name()|var_name }}, into: &buf)
+            {% endfor -%}
+        {% else %}
+        case .{{ variant.name()|enum_variant_swift_quoted }}:
+            writeInt(&buf, Int32({{ loop.index }}))
+        {% endif %}
+        {%- endfor %}
+        }
+    }
+}
+
+{#
+We always write these public functions just in case the enum is used as
+an external type by another crate.
+#}
+public func {{ ffi_converter_name }}_lift(_ buf: RustBuffer) throws -> {{ type_name }} {
+    return try {{ ffi_converter_name }}.lift(buf)
+}
+
+public func {{ ffi_converter_name }}_lower(_ value: {{ type_name }}) -> RustBuffer {
+    return {{ ffi_converter_name }}.lower(value)
+}
+
+{% if !contains_object_references %}
+extension {{ type_name }}: Equatable, Hashable {}
+{% endif %}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ErrorTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ErrorTemplate.swift
new file mode 100644
index 0000000000..786091395b
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ErrorTemplate.swift
@@ -0,0 +1,86 @@
+public enum {{ type_name }} {
+
+    {% if e.is_flat() %}
+    {% for variant in e.variants() %}
+    // Simple error enums only carry a message
+    case {{ variant.name()|class_name }}(message: String)
+    {% endfor %}
+
+    {%- else %}
+    {% for variant in e.variants() %}
+    case {{ variant.name()|class_name }}{% if variant.fields().len() > 0 %}({% call swift::field_list_decl(variant) %}){% endif -%}
+    {% endfor %}
+
+    {%- endif %}
+
+    fileprivate static func uniffiErrorHandler(_ error: RustBuffer) throws -> Error {
+        return try {{ ffi_converter_name }}.lift(error)
+    }
+}
+
+
+public struct {{ ffi_converter_name }}: FfiConverterRustBuffer {
+    typealias SwiftType = {{ type_name }}
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ type_name }} {
+        let variant: Int32 = try readInt(&buf)
+        switch variant {
+
+        {% if e.is_flat() %}
+
+        {% for variant in e.variants() %}
+        case {{ loop.index }}: return .{{ variant.name()|class_name }}(
+            message: try {{ Type::String.borrow()|read_fn }}(from: &buf)
+        )
+        {% endfor %}
+
+        {% else %}
+
+        {% for variant in e.variants() %}
+        case {{ loop.index }}: return .{{ variant.name()|class_name }}{% if variant.has_fields() -%}(
+            {% for field in variant.fields() -%}
+            {{ field.name()|var_name }}: try {{ field|read_fn }}(from: &buf)
+            {%- if !loop.last %}, {% endif %}
+            {% endfor -%}
+        ){% endif -%}
+        {% endfor %}
+
+         {% endif -%}
+        default: throw UniffiInternalError.unexpectedEnumCase
+        }
+    }
+
+    public static func write(_ value: {{ type_name }}, into buf: inout [UInt8]) {
+        switch value {
+
+        {% if e.is_flat() %}
+
+        {% for variant in e.variants() %}
+        case .{{ variant.name()|class_name }}(_ /* message is ignored*/):
+            writeInt(&buf, Int32({{ loop.index }}))
+        {%- endfor %}
+
+        {% else %}
+
+        {% for variant in e.variants() %}
+        {% if variant.has_fields() %}
+        case let .{{ variant.name()|class_name }}({% for field in variant.fields() %}{{ field.name()|var_name }}{%- if loop.last -%}{%- else -%},{%- endif -%}{% endfor %}):
+            writeInt(&buf, Int32({{ loop.index }}))
+            {% for field in variant.fields() -%}
+            {{ field|write_fn }}({{ field.name()|var_name }}, into: &buf)
+            {% endfor -%}
+        {% else %}
+        case .{{ variant.name()|class_name }}:
+            writeInt(&buf, Int32({{ loop.index }}))
+        {% endif %}
+        {%- endfor %}
+
+        {%- endif %}
+        }
+    }
+}
+
+{% if !contains_object_references %}
+extension {{ type_name }}: Equatable, Hashable {}
+{% endif %}
+extension {{ type_name }}: Error { }
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Float32Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Float32Helper.swift
new file mode 100644
index 0000000000..fb986beab6
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Float32Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterFloat: FfiConverterPrimitive {
+    typealias FfiType = Float
+    typealias SwiftType = Float
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Float {
+        return try lift(readFloat(&buf))
+    }
+
+    public static func write(_ value: Float, into buf: inout [UInt8]) {
+        writeFloat(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Float64Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Float64Helper.swift
new file mode 100644
index 0000000000..74421c045c
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Float64Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterDouble: FfiConverterPrimitive {
+    typealias FfiType = Double
+    typealias SwiftType = Double
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Double {
+        return try lift(readDouble(&buf))
+    }
+
+    public static func write(_ value: Double, into buf: inout [UInt8]) {
+        writeDouble(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ForeignExecutorTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ForeignExecutorTemplate.swift
new file mode 100644
index 0000000000..167e4c7546
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ForeignExecutorTemplate.swift
@@ -0,0 +1,69 @@
+private let UNIFFI_RUST_TASK_CALLBACK_SUCCESS: Int8 = 0
+private let UNIFFI_RUST_TASK_CALLBACK_CANCELLED: Int8 = 1
+private let UNIFFI_FOREIGN_EXECUTOR_CALLBACK_SUCCESS: Int8 = 0
+private let UNIFFI_FOREIGN_EXECUTOR_CALLBACK_CANCELED: Int8 = 1
+private let UNIFFI_FOREIGN_EXECUTOR_CALLBACK_ERROR: Int8 = 2
+
+// Encapsulates an executor that can run Rust tasks
+//
+// On Swift, `Task.detached` can handle this we just need to know what priority to send it.
+public struct UniFfiForeignExecutor {
+    var priority: TaskPriority
+
+    public init(priority: TaskPriority) {
+        self.priority = priority
+    }
+
+    public init() {
+        self.priority = Task.currentPriority
+    }
+}
+
+fileprivate struct FfiConverterForeignExecutor: FfiConverter {
+    typealias SwiftType = UniFfiForeignExecutor
+    // Rust uses a pointer to represent the FfiConverterForeignExecutor, but we only need a u8.
+    // let's use `Int`, which is equivalent to `size_t`
+    typealias FfiType = Int
+
+    public static func lift(_ value: FfiType) throws -> SwiftType {
+        UniFfiForeignExecutor(priority: TaskPriority(rawValue: numericCast(value)))
+    }
+    public static func lower(_ value: SwiftType) -> FfiType {
+        numericCast(value.priority.rawValue)
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> SwiftType {
+        fatalError("FfiConverterForeignExecutor.read not implemented yet")
+    }
+    public static func write(_ value: SwiftType, into buf: inout [UInt8]) {
+        fatalError("FfiConverterForeignExecutor.read not implemented yet")
+    }
+}
+
+
+fileprivate func uniffiForeignExecutorCallback(executorHandle: Int, delayMs: UInt32, rustTask: UniFfiRustTaskCallback?, taskData: UnsafeRawPointer?) -> Int8 {
+    if let rustTask = rustTask {
+        let executor = try! FfiConverterForeignExecutor.lift(executorHandle)
+        Task.detached(priority: executor.priority) {
+            if delayMs != 0 {
+                let nanoseconds: UInt64 = numericCast(delayMs * 1000000)
+                try! await Task.sleep(nanoseconds: nanoseconds)
+            }
+            rustTask(taskData, UNIFFI_RUST_TASK_CALLBACK_SUCCESS)
+        }
+        return UNIFFI_FOREIGN_EXECUTOR_CALLBACK_SUCCESS
+    } else {
+        // When rustTask is null, we should drop the foreign executor.
+        // However, since its just a value type, we don't need to do anything here.
+        return UNIFFI_FOREIGN_EXECUTOR_CALLBACK_SUCCESS
+    }
+}
+
+fileprivate func uniffiInitForeignExecutor() {
+    {%- match ci.ffi_foreign_executor_callback_set() %}
+    {%- when Some with (fn) %}
+    {{ fn.name() }}(uniffiForeignExecutorCallback)
+    {%- when None %}
+    {#- No foreign executor, we don't set anything #}
+    {% endmatch %}
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Helpers.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Helpers.swift
new file mode 100644
index 0000000000..a34b128e23
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Helpers.swift
@@ -0,0 +1,101 @@
+// An error type for FFI errors. These errors occur at the UniFFI level, not
+// the library level.
+fileprivate enum UniffiInternalError: LocalizedError {
+    case bufferOverflow
+    case incompleteData
+    case unexpectedOptionalTag
+    case unexpectedEnumCase
+    case unexpectedNullPointer
+    case unexpectedRustCallStatusCode
+    case unexpectedRustCallError
+    case unexpectedStaleHandle
+    case rustPanic(_ message: String)
+
+    public var errorDescription: String? {
+        switch self {
+        case .bufferOverflow: return "Reading the requested value would read past the end of the buffer"
+        case .incompleteData: return "The buffer still has data after lifting its containing value"
+        case .unexpectedOptionalTag: return "Unexpected optional tag; should be 0 or 1"
+        case .unexpectedEnumCase: return "Raw enum value doesn't match any cases"
+        case .unexpectedNullPointer: return "Raw pointer value was null"
+        case .unexpectedRustCallStatusCode: return "Unexpected RustCallStatus code"
+        case .unexpectedRustCallError: return "CALL_ERROR but no errorClass specified"
+        case .unexpectedStaleHandle: return "The object in the handle map has been dropped already"
+        case let .rustPanic(message): return message
+        }
+    }
+}
+
+fileprivate let CALL_SUCCESS: Int8 = 0
+fileprivate let CALL_ERROR: Int8 = 1
+fileprivate let CALL_PANIC: Int8 = 2
+fileprivate let CALL_CANCELLED: Int8 = 3
+
+fileprivate extension RustCallStatus {
+    init() {
+        self.init(
+            code: CALL_SUCCESS,
+            errorBuf: RustBuffer.init(
+                capacity: 0,
+                len: 0,
+                data: nil
+            )
+        )
+    }
+}
+
+private func rustCall<T>(_ callback: (UnsafeMutablePointer<RustCallStatus>) -> T) throws -> T {
+    try makeRustCall(callback, errorHandler: nil)
+}
+
+private func rustCallWithError<T>(
+    _ errorHandler: @escaping (RustBuffer) throws -> Error,
+    _ callback: (UnsafeMutablePointer<RustCallStatus>) -> T) throws -> T {
+    try makeRustCall(callback, errorHandler: errorHandler)
+}
+
+private func makeRustCall<T>(
+    _ callback: (UnsafeMutablePointer<RustCallStatus>) -> T,
+    errorHandler: ((RustBuffer) throws -> Error)?
+) throws -> T {
+    uniffiEnsureInitialized()
+    var callStatus = RustCallStatus.init()
+    let returnedVal = callback(&callStatus)
+    try uniffiCheckCallStatus(callStatus: callStatus, errorHandler: errorHandler)
+    return returnedVal
+}
+
+private func uniffiCheckCallStatus(
+    callStatus: RustCallStatus,
+    errorHandler: ((RustBuffer) throws -> Error)?
+) throws {
+    switch callStatus.code {
+        case CALL_SUCCESS:
+            return
+
+        case CALL_ERROR:
+            if let errorHandler = errorHandler {
+                throw try errorHandler(callStatus.errorBuf)
+            } else {
+                callStatus.errorBuf.deallocate()
+                throw UniffiInternalError.unexpectedRustCallError
+            }
+
+        case CALL_PANIC:
+            // When the rust code sees a panic, it tries to construct a RustBuffer
+            // with the message.  But if that code panics, then it just sends back
+            // an empty buffer.
+            if callStatus.errorBuf.len > 0 {
+                throw UniffiInternalError.rustPanic(try {{ Type::String.borrow()|lift_fn }}(callStatus.errorBuf))
+            } else {
+                callStatus.errorBuf.deallocate()
+                throw UniffiInternalError.rustPanic("Rust panic")
+            }
+
+        case CALL_CANCELLED:
+                throw CancellationError()
+
+        default:
+            throw UniffiInternalError.unexpectedRustCallStatusCode
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int16Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int16Helper.swift
new file mode 100644
index 0000000000..ac57fc5e58
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int16Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterInt16: FfiConverterPrimitive {
+    typealias FfiType = Int16
+    typealias SwiftType = Int16
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Int16 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: Int16, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int32Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int32Helper.swift
new file mode 100644
index 0000000000..0ccfc13e4e
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int32Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterInt32: FfiConverterPrimitive {
+    typealias FfiType = Int32
+    typealias SwiftType = Int32
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Int32 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: Int32, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int64Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int64Helper.swift
new file mode 100644
index 0000000000..d7d4082933
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int64Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterInt64: FfiConverterPrimitive {
+    typealias FfiType = Int64
+    typealias SwiftType = Int64
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Int64 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: Int64, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int8Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int8Helper.swift
new file mode 100644
index 0000000000..f2387e4340
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Int8Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterInt8: FfiConverterPrimitive {
+    typealias FfiType = Int8
+    typealias SwiftType = Int8
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Int8 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: Int8, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/MapTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/MapTemplate.swift
new file mode 100644
index 0000000000..05713aca26
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/MapTemplate.swift
@@ -0,0 +1,22 @@
+fileprivate struct {{ ffi_converter_name }}: FfiConverterRustBuffer {
+    public static func write(_ value: {{ type_name }}, into buf: inout [UInt8]) {
+        let len = Int32(value.count)
+        writeInt(&buf, len)
+        for (key, value) in value {
+            {{ key_type|write_fn }}(key, into: &buf)
+            {{ value_type|write_fn }}(value, into: &buf)
+        }
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ type_name }} {
+        let len: Int32 = try readInt(&buf)
+        var dict = {{ type_name }}()
+        dict.reserveCapacity(Int(len))
+        for _ in 0..<len {
+            let key = try {{ key_type|read_fn }}(from: &buf)
+            let value = try {{ value_type|read_fn }}(from: &buf)
+            dict[key] = value
+        }
+        return dict
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ModuleMapTemplate.modulemap b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ModuleMapTemplate.modulemap
new file mode 100644
index 0000000000..f5f73ceb1b
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ModuleMapTemplate.modulemap
@@ -0,0 +1,6 @@
+// This file was autogenerated by some hot garbage in the `uniffi` crate.
+// Trust me, you don't want to mess with it!
+module {{ config.ffi_module_name() }} {
+    header "{{ config.header_filename() }}"
+    export *
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ObjectTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ObjectTemplate.swift
new file mode 100644
index 0000000000..57a77ca6df
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/ObjectTemplate.swift
@@ -0,0 +1,138 @@
+{%- let obj = ci|get_object_definition(name) %}
+public protocol {{ obj.name() }}Protocol {
+    {% for meth in obj.methods() -%}
+    func {{ meth.name()|fn_name }}({% call swift::arg_list_protocol(meth) %}) {% call swift::async(meth) %} {% call swift::throws(meth) -%}
+    {%- match meth.return_type() -%}
+    {%- when Some with (return_type) %} -> {{ return_type|type_name -}}
+    {%- else -%}
+    {%- endmatch %}
+    {% endfor %}
+}
+
+public class {{ type_name }}: {{ obj.name() }}Protocol {
+    fileprivate let pointer: UnsafeMutableRawPointer
+
+    // TODO: We'd like this to be `private` but for Swifty reasons,
+    // we can't implement `FfiConverter` without making this `required` and we can't
+    // make it `required` without making it `public`.
+    required init(unsafeFromRawPointer pointer: UnsafeMutableRawPointer) {
+        self.pointer = pointer
+    }
+
+    {%- match obj.primary_constructor() %}
+    {%- when Some with (cons) %}
+    public convenience init({% call swift::arg_list_decl(cons) -%}) {% call swift::throws(cons) %} {
+        self.init(unsafeFromRawPointer: {% call swift::to_ffi_call(cons) %})
+    }
+    {%- when None %}
+    {%- endmatch %}
+
+    deinit {
+        try! rustCall { {{ obj.ffi_object_free().name() }}(pointer, $0) }
+    }
+
+    {% for cons in obj.alternate_constructors() %}
+
+    public static func {{ cons.name()|fn_name }}({% call swift::arg_list_decl(cons) %}) {% call swift::throws(cons) %} -> {{ type_name }} {
+        return {{ type_name }}(unsafeFromRawPointer: {% call swift::to_ffi_call(cons) %})
+    }
+
+    {% endfor %}
+
+    {# // TODO: Maybe merge the two templates (i.e the one with a return type and the one without) #}
+    {% for meth in obj.methods() -%}
+    {%- if meth.is_async() %}
+
+    public func {{ meth.name()|fn_name }}({%- call swift::arg_list_decl(meth) -%}) async {% call swift::throws(meth) %}{% match meth.return_type() %}{% when Some with (return_type) %} -> {{ return_type|type_name }}{% when None %}{% endmatch %} {
+        return {% call swift::try(meth) %} await uniffiRustCallAsync(
+            rustFutureFunc: {
+                {{ meth.ffi_func().name() }}(
+                    self.pointer
+                    {%- for arg in meth.arguments() -%}
+                    ,
+                    {{ arg|lower_fn }}({{ arg.name()|var_name }})
+                    {%- endfor %}
+                )
+            },
+            pollFunc: {{ meth.ffi_rust_future_poll(ci) }},
+            completeFunc: {{ meth.ffi_rust_future_complete(ci) }},
+            freeFunc: {{ meth.ffi_rust_future_free(ci) }},
+            {%- match meth.return_type() %}
+            {%- when Some(return_type) %}
+            liftFunc: {{ return_type|lift_fn }},
+            {%- when None %}
+            liftFunc: { $0 },
+            {%- endmatch %}
+            {%- match meth.throws_type() %}
+            {%- when Some with (e) %}
+            errorHandler: {{ e|ffi_converter_name }}.lift
+            {%- else %}
+            errorHandler: nil
+            {% endmatch %}
+        )
+    }
+
+    {% else -%}
+
+    {%- match meth.return_type() -%}
+
+    {%- when Some with (return_type) %}
+
+    public func {{ meth.name()|fn_name }}({% call swift::arg_list_decl(meth) %}) {% call swift::throws(meth) %} -> {{ return_type|type_name }} {
+        return {% call swift::try(meth) %} {{ return_type|lift_fn }}(
+            {% call swift::to_ffi_call_with_prefix("self.pointer", meth) %}
+        )
+    }
+
+    {%- when None %}
+
+    public func {{ meth.name()|fn_name }}({% call swift::arg_list_decl(meth) %}) {% call swift::throws(meth) %} {
+        {% call swift::to_ffi_call_with_prefix("self.pointer", meth) %}
+    }
+
+    {%- endmatch -%}
+    {%- endif -%}
+    {% endfor %}
+}
+
+public struct {{ ffi_converter_name }}: FfiConverter {
+    typealias FfiType = UnsafeMutableRawPointer
+    typealias SwiftType = {{ type_name }}
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ type_name }} {
+        let v: UInt64 = try readInt(&buf)
+        // The Rust code won't compile if a pointer won't fit in a UInt64.
+        // We have to go via `UInt` because that's the thing that's the size of a pointer.
+        let ptr = UnsafeMutableRawPointer(bitPattern: UInt(truncatingIfNeeded: v))
+        if (ptr == nil) {
+            throw UniffiInternalError.unexpectedNullPointer
+        }
+        return try lift(ptr!)
+    }
+
+    public static func write(_ value: {{ type_name }}, into buf: inout [UInt8]) {
+        // This fiddling is because `Int` is the thing that's the same size as a pointer.
+        // The Rust code won't compile if a pointer won't fit in a `UInt64`.
+        writeInt(&buf, UInt64(bitPattern: Int64(Int(bitPattern: lower(value)))))
+    }
+
+    public static func lift(_ pointer: UnsafeMutableRawPointer) throws -> {{ type_name }} {
+        return {{ type_name}}(unsafeFromRawPointer: pointer)
+    }
+
+    public static func lower(_ value: {{ type_name }}) -> UnsafeMutableRawPointer {
+        return value.pointer
+    }
+}
+
+{#
+We always write these public functions just in case the enum is used as
+an external type by another crate.
+#}
+public func {{ ffi_converter_name }}_lift(_ pointer: UnsafeMutableRawPointer) throws -> {{ type_name }} {
+    return try {{ ffi_converter_name }}.lift(pointer)
+}
+
+public func {{ ffi_converter_name }}_lower(_ value: {{ type_name }}) -> UnsafeMutableRawPointer {
+    return {{ ffi_converter_name }}.lower(value)
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/OptionalTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/OptionalTemplate.swift
new file mode 100644
index 0000000000..1dac65be63
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/OptionalTemplate.swift
@@ -0,0 +1,20 @@
+fileprivate struct {{ ffi_converter_name }}: FfiConverterRustBuffer {
+    typealias SwiftType = {{ type_name }}
+
+    public static func write(_ value: SwiftType, into buf: inout [UInt8]) {
+        guard let value = value else {
+            writeInt(&buf, Int8(0))
+            return
+        }
+        writeInt(&buf, Int8(1))
+        {{ inner_type|write_fn }}(value, into: &buf)
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> SwiftType {
+        switch try readInt(&buf) as Int8 {
+        case 0: return nil
+        case 1: return try {{ inner_type|read_fn }}(from: &buf)
+        default: throw UniffiInternalError.unexpectedOptionalTag
+        }
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/RecordTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/RecordTemplate.swift
new file mode 100644
index 0000000000..44de9dd358
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/RecordTemplate.swift
@@ -0,0 +1,62 @@
+{%- let rec = ci|get_record_definition(name) %}
+public struct {{ type_name }} {
+    {%- for field in rec.fields() %}
+    public var {{ field.name()|var_name }}: {{ field|type_name }}
+    {%- endfor %}
+
+    // Default memberwise initializers are never public by default, so we
+    // declare one manually.
+    public init({% call swift::field_list_decl(rec) %}) {
+        {%- for field in rec.fields() %}
+        self.{{ field.name()|var_name }} = {{ field.name()|var_name }}
+        {%- endfor %}
+    }
+}
+
+{% if !contains_object_references %}
+extension {{ type_name }}: Equatable, Hashable {
+    public static func ==(lhs: {{ type_name }}, rhs: {{ type_name }}) -> Bool {
+        {%- for field in rec.fields() %}
+        if lhs.{{ field.name()|var_name }} != rhs.{{ field.name()|var_name }} {
+            return false
+        }
+        {%- endfor %}
+        return true
+    }
+
+    public func hash(into hasher: inout Hasher) {
+        {%- for field in rec.fields() %}
+        hasher.combine({{ field.name()|var_name }})
+        {%- endfor %}
+    }
+}
+{% endif %}
+
+public struct {{ ffi_converter_name }}: FfiConverterRustBuffer {
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ type_name }} {
+        return try {{ type_name }}(
+            {%- for field in rec.fields() %}
+            {{ field.name()|arg_name }}: {{ field|read_fn }}(from: &buf)
+            {%- if !loop.last %}, {% endif %}
+            {%- endfor %}
+        )
+    }
+
+    public static func write(_ value: {{ type_name }}, into buf: inout [UInt8]) {
+        {%- for field in rec.fields() %}
+        {{ field|write_fn }}(value.{{ field.name()|var_name }}, into: &buf)
+        {%- endfor %}
+    }
+}
+
+{#
+We always write these public functions just in case the struct is used as
+an external type by another crate.
+#}
+public func {{ ffi_converter_name }}_lift(_ buf: RustBuffer) throws -> {{ type_name }} {
+    return try {{ ffi_converter_name }}.lift(buf)
+}
+
+public func {{ ffi_converter_name }}_lower(_ value: {{ type_name }}) -> RustBuffer {
+    return {{ ffi_converter_name }}.lower(value)
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/RustBufferTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/RustBufferTemplate.swift
new file mode 100644
index 0000000000..2f737b6635
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/RustBufferTemplate.swift
@@ -0,0 +1,183 @@
+fileprivate extension RustBuffer {
+    // Allocate a new buffer, copying the contents of a `UInt8` array.
+    init(bytes: [UInt8]) {
+        let rbuf = bytes.withUnsafeBufferPointer { ptr in
+            RustBuffer.from(ptr)
+        }
+        self.init(capacity: rbuf.capacity, len: rbuf.len, data: rbuf.data)
+    }
+
+    static func from(_ ptr: UnsafeBufferPointer<UInt8>) -> RustBuffer {
+        try! rustCall { {{ ci.ffi_rustbuffer_from_bytes().name() }}(ForeignBytes(bufferPointer: ptr), $0) }
+    }
+
+    // Frees the buffer in place.
+    // The buffer must not be used after this is called.
+    func deallocate() {
+        try! rustCall { {{ ci.ffi_rustbuffer_free().name() }}(self, $0) }
+    }
+}
+
+fileprivate extension ForeignBytes {
+    init(bufferPointer: UnsafeBufferPointer<UInt8>) {
+        self.init(len: Int32(bufferPointer.count), data: bufferPointer.baseAddress)
+    }
+}
+
+// For every type used in the interface, we provide helper methods for conveniently
+// lifting and lowering that type from C-compatible data, and for reading and writing
+// values of that type in a buffer.
+
+// Helper classes/extensions that don't change.
+// Someday, this will be in a library of its own.
+
+fileprivate extension Data {
+    init(rustBuffer: RustBuffer) {
+        // TODO: This copies the buffer. Can we read directly from a
+        // Rust buffer?
+        self.init(bytes: rustBuffer.data!, count: Int(rustBuffer.len))
+    }
+}
+
+// Define reader functionality.  Normally this would be defined in a class or
+// struct, but we use standalone functions instead in order to make external
+// types work.
+//
+// With external types, one swift source file needs to be able to call the read
+// method on another source file's FfiConverter, but then what visibility
+// should Reader have?
+// - If Reader is fileprivate, then this means the read() must also
+//   be fileprivate, which doesn't work with external types.
+// - If Reader is internal/public, we'll get compile errors since both source
+//   files will try define the same type.
+//
+// Instead, the read() method and these helper functions input a tuple of data
+
+fileprivate func createReader(data: Data) -> (data: Data, offset: Data.Index) {
+    (data: data, offset: 0)
+}
+
+// Reads an integer at the current offset, in big-endian order, and advances
+// the offset on success. Throws if reading the integer would move the
+// offset past the end of the buffer.
+fileprivate func readInt<T: FixedWidthInteger>(_ reader: inout (data: Data, offset: Data.Index)) throws -> T {
+    let range = reader.offset..<reader.offset + MemoryLayout<T>.size
+    guard reader.data.count >= range.upperBound else {
+        throw UniffiInternalError.bufferOverflow
+    }
+    if T.self == UInt8.self {
+        let value = reader.data[reader.offset]
+        reader.offset += 1
+        return value as! T
+    }
+    var value: T = 0
+    let _ = withUnsafeMutableBytes(of: &value, { reader.data.copyBytes(to: $0, from: range)})
+    reader.offset = range.upperBound
+    return value.bigEndian
+}
+
+// Reads an arbitrary number of bytes, to be used to read
+// raw bytes, this is useful when lifting strings
+fileprivate func readBytes(_ reader: inout (data: Data, offset: Data.Index), count: Int) throws -> Array<UInt8> {
+    let range = reader.offset..<(reader.offset+count)
+    guard reader.data.count >= range.upperBound else {
+        throw UniffiInternalError.bufferOverflow
+    }
+    var value = [UInt8](repeating: 0, count: count)
+    value.withUnsafeMutableBufferPointer({ buffer in
+        reader.data.copyBytes(to: buffer, from: range)
+    })
+    reader.offset = range.upperBound
+    return value
+}
+
+// Reads a float at the current offset.
+fileprivate func readFloat(_ reader: inout (data: Data, offset: Data.Index)) throws -> Float {
+    return Float(bitPattern: try readInt(&reader))
+}
+
+// Reads a float at the current offset.
+fileprivate func readDouble(_ reader: inout (data: Data, offset: Data.Index)) throws -> Double {
+    return Double(bitPattern: try readInt(&reader))
+}
+
+// Indicates if the offset has reached the end of the buffer.
+fileprivate func hasRemaining(_ reader: (data: Data, offset: Data.Index)) -> Bool {
+    return reader.offset < reader.data.count
+}
+
+// Define writer functionality.  Normally this would be defined in a class or
+// struct, but we use standalone functions instead in order to make external
+// types work.  See the above discussion on Readers for details.
+
+fileprivate func createWriter() -> [UInt8] {
+    return []
+}
+
+fileprivate func writeBytes<S>(_ writer: inout [UInt8], _ byteArr: S) where S: Sequence, S.Element == UInt8 {
+    writer.append(contentsOf: byteArr)
+}
+
+// Writes an integer in big-endian order.
+//
+// Warning: make sure what you are trying to write
+// is in the correct type!
+fileprivate func writeInt<T: FixedWidthInteger>(_ writer: inout [UInt8], _ value: T) {
+    var value = value.bigEndian
+    withUnsafeBytes(of: &value) { writer.append(contentsOf: $0) }
+}
+
+fileprivate func writeFloat(_ writer: inout [UInt8], _ value: Float) {
+    writeInt(&writer, value.bitPattern)
+}
+
+fileprivate func writeDouble(_ writer: inout [UInt8], _ value: Double) {
+    writeInt(&writer, value.bitPattern)
+}
+
+// Protocol for types that transfer other types across the FFI. This is
+// analogous go the Rust trait of the same name.
+fileprivate protocol FfiConverter {
+    associatedtype FfiType
+    associatedtype SwiftType
+
+    static func lift(_ value: FfiType) throws -> SwiftType
+    static func lower(_ value: SwiftType) -> FfiType
+    static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> SwiftType
+    static func write(_ value: SwiftType, into buf: inout [UInt8])
+}
+
+// Types conforming to `Primitive` pass themselves directly over the FFI.
+fileprivate protocol FfiConverterPrimitive: FfiConverter where FfiType == SwiftType { }
+
+extension FfiConverterPrimitive {
+    public static func lift(_ value: FfiType) throws -> SwiftType {
+        return value
+    }
+
+    public static func lower(_ value: SwiftType) -> FfiType {
+        return value
+    }
+}
+
+// Types conforming to `FfiConverterRustBuffer` lift and lower into a `RustBuffer`.
+// Used for complex types where it's hard to write a custom lift/lower.
+fileprivate protocol FfiConverterRustBuffer: FfiConverter where FfiType == RustBuffer {}
+
+extension FfiConverterRustBuffer {
+    public static func lift(_ buf: RustBuffer) throws -> SwiftType {
+        var reader = createReader(data: Data(rustBuffer: buf))
+        let value = try read(from: &reader)
+        if hasRemaining(reader) {
+            throw UniffiInternalError.incompleteData
+        }
+        buf.deallocate()
+        return value
+    }
+
+    public static func lower(_ value: SwiftType) -> RustBuffer {
+          var writer = createWriter()
+          write(value, into: &writer)
+          return RustBuffer(bytes: writer)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/SequenceTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/SequenceTemplate.swift
new file mode 100644
index 0000000000..bf664f6411
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/SequenceTemplate.swift
@@ -0,0 +1,21 @@
+fileprivate struct {{ ffi_converter_name }}: FfiConverterRustBuffer {
+    typealias SwiftType = {{ type_name }}
+
+    public static func write(_ value: {{ type_name }}, into buf: inout [UInt8]) {
+        let len = Int32(value.count)
+        writeInt(&buf, len)
+        for item in value {
+            {{ inner_type|write_fn }}(item, into: &buf)
+        }
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ type_name }} {
+        let len: Int32 = try readInt(&buf)
+        var seq = {{ type_name }}()
+        seq.reserveCapacity(Int(len))
+        for _ in 0 ..< len {
+            seq.append(try {{ inner_type|read_fn }}(from: &buf))
+        }
+        return seq
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/StringHelper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/StringHelper.swift
new file mode 100644
index 0000000000..b7d3466bdd
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/StringHelper.swift
@@ -0,0 +1,37 @@
+fileprivate struct FfiConverterString: FfiConverter {
+    typealias SwiftType = String
+    typealias FfiType = RustBuffer
+
+    public static func lift(_ value: RustBuffer) throws -> String {
+        defer {
+            value.deallocate()
+        }
+        if value.data == nil {
+            return String()
+        }
+        let bytes = UnsafeBufferPointer<UInt8>(start: value.data!, count: Int(value.len))
+        return String(bytes: bytes, encoding: String.Encoding.utf8)!
+    }
+
+    public static func lower(_ value: String) -> RustBuffer {
+        return value.utf8CString.withUnsafeBufferPointer { ptr in
+            // The swift string gives us int8_t, we want uint8_t.
+            ptr.withMemoryRebound(to: UInt8.self) { ptr in
+                // The swift string gives us a trailing null byte, we don't want it.
+                let buf = UnsafeBufferPointer(rebasing: ptr.prefix(upTo: ptr.count - 1))
+                return RustBuffer.from(buf)
+            }
+        }
+    }
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> String {
+        let len: Int32 = try readInt(&buf)
+        return String(bytes: try readBytes(&buf, count: Int(len)), encoding: String.Encoding.utf8)!
+    }
+
+    public static func write(_ value: String, into buf: inout [UInt8]) {
+        let len = Int32(value.utf8.count)
+        writeInt(&buf, len)
+        writeBytes(&buf, value.utf8)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TimestampHelper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TimestampHelper.swift
new file mode 100644
index 0000000000..3cd472fa0e
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TimestampHelper.swift
@@ -0,0 +1,34 @@
+fileprivate struct FfiConverterTimestamp: FfiConverterRustBuffer {
+    typealias SwiftType = Date
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Date {
+        let seconds: Int64 = try readInt(&buf)
+        let nanoseconds: UInt32 = try readInt(&buf)
+        if seconds >= 0 {
+            let delta = Double(seconds) + (Double(nanoseconds) / 1.0e9)
+            return Date.init(timeIntervalSince1970: delta)
+        } else {
+            let delta = Double(seconds) - (Double(nanoseconds) / 1.0e9)
+            return Date.init(timeIntervalSince1970: delta)
+        }
+    }
+
+    public static func write(_ value: Date, into buf: inout [UInt8]) {
+        var delta = value.timeIntervalSince1970
+        var sign: Int64 = 1
+        if delta < 0 {
+            // The nanoseconds portion of the epoch offset must always be
+            // positive, to simplify the calculation we will use the absolute
+            // value of the offset.
+            sign = -1
+            delta = -delta
+        }
+        if delta.rounded(.down) > Double(Int64.max) {
+            fatalError("Timestamp overflow, exceeds max bounds supported by Uniffi")
+        }
+        let seconds = Int64(delta)
+        let nanoseconds = UInt32((delta - Double(seconds)) * 1.0e9)
+        writeInt(&buf, sign * seconds)
+        writeInt(&buf, nanoseconds)
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TopLevelFunctionTemplate.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TopLevelFunctionTemplate.swift
new file mode 100644
index 0000000000..a2c6311931
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TopLevelFunctionTemplate.swift
@@ -0,0 +1,48 @@
+{%- if func.is_async() %}
+
+public func {{ func.name()|fn_name }}({%- call swift::arg_list_decl(func) -%}) async {% call swift::throws(func) %}{% match func.return_type() %}{% when Some with (return_type) %} -> {{ return_type|type_name }}{% when None %}{% endmatch %} {
+    return {% call swift::try(func) %} await uniffiRustCallAsync(
+        rustFutureFunc: {
+            {{ func.ffi_func().name() }}(
+                {%- for arg in func.arguments() %}
+                {{ arg|lower_fn }}({{ arg.name()|var_name }}){% if !loop.last %},{% endif %}
+                {%- endfor %}
+            )
+        },
+        pollFunc: {{ func.ffi_rust_future_poll(ci) }},
+        completeFunc: {{ func.ffi_rust_future_complete(ci) }},
+        freeFunc: {{ func.ffi_rust_future_free(ci) }},
+        {%- match func.return_type() %}
+        {%- when Some(return_type) %}
+        liftFunc: {{ return_type|lift_fn }},
+        {%- when None %}
+        liftFunc: { $0 },
+        {%- endmatch %}
+        {%- match func.throws_type() %}
+        {%- when Some with (e) %}
+        errorHandler: {{ e|ffi_converter_name }}.lift
+        {%- else %}
+        errorHandler: nil
+        {% endmatch %}
+    )
+}
+
+{% else %}
+
+{%- match func.return_type() -%}
+{%- when Some with (return_type) %}
+
+public func {{ func.name()|fn_name }}({%- call swift::arg_list_decl(func) -%}) {% call swift::throws(func) %} -> {{ return_type|type_name }} {
+    return {% call swift::try(func) %} {{ return_type|lift_fn }}(
+        {% call swift::to_ffi_call(func) %}
+    )
+}
+
+{%- when None %}
+
+public func {{ func.name()|fn_name }}({% call swift::arg_list_decl(func) %}) {% call swift::throws(func) %} {
+    {% call swift::to_ffi_call(func) %}
+}
+
+{% endmatch %}
+{%- endif %}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Types.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Types.swift
new file mode 100644
index 0000000000..aba34f4b0b
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/Types.swift
@@ -0,0 +1,98 @@
+{%- import "macros.swift" as swift %}
+{%- for type_ in ci.iter_types() %}
+{%- let type_name = type_|type_name %}
+{%- let ffi_converter_name = type_|ffi_converter_name %}
+{%- let canonical_type_name = type_|canonical_name %}
+{%- let contains_object_references = ci.item_contains_object_references(type_) %}
+
+{#
+ # Map `Type` instances to an include statement for that type.
+ #
+ # There is a companion match in `KotlinCodeOracle::create_code_type()` which performs a similar function for the
+ # Rust code.
+ #
+ #   - When adding additional types here, make sure to also add a match arm to that function.
+ #   - To keep things manageable, let's try to limit ourselves to these 2 mega-matches
+ #}
+{%- match type_ %}
+
+{%- when Type::Boolean %}
+{%- include "BooleanHelper.swift" %}
+
+{%- when Type::String %}
+{%- include "StringHelper.swift" %}
+
+{%- when Type::Bytes %}
+{%- include "DataHelper.swift" %}
+
+{%- when Type::Int8 %}
+{%- include "Int8Helper.swift" %}
+
+{%- when Type::Int16 %}
+{%- include "Int16Helper.swift" %}
+
+{%- when Type::Int32 %}
+{%- include "Int32Helper.swift" %}
+
+{%- when Type::Int64 %}
+{%- include "Int64Helper.swift" %}
+
+{%- when Type::UInt8 %}
+{%- include "UInt8Helper.swift" %}
+
+{%- when Type::UInt16 %}
+{%- include "UInt16Helper.swift" %}
+
+{%- when Type::UInt32 %}
+{%- include "UInt32Helper.swift" %}
+
+{%- when Type::UInt64 %}
+{%- include "UInt64Helper.swift" %}
+
+{%- when Type::Float32 %}
+{%- include "Float32Helper.swift" %}
+
+{%- when Type::Float64 %}
+{%- include "Float64Helper.swift" %}
+
+{%- when Type::Timestamp %}
+{%- include "TimestampHelper.swift" %}
+
+{%- when Type::Duration %}
+{%- include "DurationHelper.swift" %}
+
+{%- when Type::CallbackInterface { name, module_path } %}
+{%- include "CallbackInterfaceTemplate.swift" %}
+
+{%- when Type::ForeignExecutor %}
+{%- include "ForeignExecutorTemplate.swift" %}
+
+{%- when Type::Custom { name, module_path, builtin } %}
+{%- include "CustomType.swift" %}
+
+{%- when Type::Enum { name, module_path } %}
+{%- let e = ci.get_enum_definition(name).unwrap() %}
+{%- if ci.is_name_used_as_error(name) %}
+{%- include "ErrorTemplate.swift" %}
+{%- else %}
+{%- include "EnumTemplate.swift" %}
+{% endif %}
+
+{%- when Type::Object{ name, module_path, imp } %}
+{%- include "ObjectTemplate.swift" %}
+
+{%- when Type::Record { name, module_path } %}
+{%- include "RecordTemplate.swift" %}
+
+{%- when Type::Optional { inner_type } %}
+{%- include "OptionalTemplate.swift" %}
+
+{%- when Type::Sequence { inner_type } %}
+{%- include "SequenceTemplate.swift" %}
+
+{%- when Type::Map { key_type, value_type } %}
+{%- include "MapTemplate.swift" %}
+
+{%- else %}
+{%- endmatch %}
+{%- endfor %}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt16Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt16Helper.swift
new file mode 100644
index 0000000000..b7fc0942a5
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt16Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterUInt16: FfiConverterPrimitive {
+    typealias FfiType = UInt16
+    typealias SwiftType = UInt16
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> UInt16 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: SwiftType, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt32Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt32Helper.swift
new file mode 100644
index 0000000000..e7a64aab93
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt32Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterUInt32: FfiConverterPrimitive {
+    typealias FfiType = UInt32
+    typealias SwiftType = UInt32
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> UInt32 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: SwiftType, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt64Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt64Helper.swift
new file mode 100644
index 0000000000..eb674a2c53
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt64Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterUInt64: FfiConverterPrimitive {
+    typealias FfiType = UInt64
+    typealias SwiftType = UInt64
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> UInt64 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: SwiftType, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt8Helper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt8Helper.swift
new file mode 100644
index 0000000000..4baf613494
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/UInt8Helper.swift
@@ -0,0 +1,12 @@
+fileprivate struct FfiConverterUInt8: FfiConverterPrimitive {
+    typealias FfiType = UInt8
+    typealias SwiftType = UInt8
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> UInt8 {
+        return try lift(readInt(&buf))
+    }
+
+    public static func write(_ value: UInt8, into buf: inout [UInt8]) {
+        writeInt(&buf, lower(value))
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/macros.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/macros.swift
new file mode 100644
index 0000000000..0a125e6f61
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/macros.swift
@@ -0,0 +1,89 @@
+{#
+// Template to call into rust. Used in several places.
+// Variable names in `arg_list_decl` should match up with arg lists
+// passed to rust via `arg_list_lowered`
+#}
+
+{%- macro to_ffi_call(func) -%}
+    {%- call try(func) -%}
+    {%- match func.throws_type() -%}
+    {%- when Some with (e) -%}
+        rustCallWithError({{ e|ffi_converter_name }}.lift) {
+    {%- else -%}
+        rustCall() {
+    {%- endmatch %}
+    {{ func.ffi_func().name() }}({% call arg_list_lowered(func) -%} $0)
+}
+{%- endmacro -%}
+
+{%- macro to_ffi_call_with_prefix(prefix, func) -%}
+{% call try(func) %}
+    {%- match func.throws_type() %}
+    {%- when Some with (e) %}
+    rustCallWithError({{ e|ffi_converter_name }}.lift) {
+    {%- else %}
+    rustCall() {
+    {% endmatch %}
+    {{ func.ffi_func().name() }}(
+        {{- prefix }}, {% call arg_list_lowered(func) -%} $0
+    )
+}
+{%- endmacro %}
+
+{%- macro arg_list_lowered(func) %}
+    {%- for arg in func.arguments() %}
+        {{ arg|lower_fn }}({{ arg.name()|var_name }}),
+    {%- endfor %}
+{%- endmacro -%}
+
+{#-
+// Arglist as used in Swift declarations of methods, functions and constructors.
+// Note the var_name and type_name filters.
+-#}
+
+{% macro arg_list_decl(func) %}
+    {%- for arg in func.arguments() -%}
+        {% if config.omit_argument_labels() %}_ {% endif %}{{ arg.name()|var_name }}: {{ arg|type_name -}}
+        {%- match arg.default_value() %}
+        {%- when Some with(literal) %} = {{ literal|literal_swift(arg) }}
+        {%- else %}
+        {%- endmatch %}
+        {%- if !loop.last %}, {% endif -%}
+    {%- endfor %}
+{%- endmacro %}
+
+{#-
+// Field lists as used in Swift declarations of Records and Enums.
+// Note the var_name and type_name filters.
+-#}
+{% macro field_list_decl(item) %}
+    {%- for field in item.fields() -%}
+        {{ field.name()|var_name }}: {{ field|type_name -}}
+        {%- match field.default_value() %}
+            {%- when Some with(literal) %} = {{ literal|literal_swift(field) }}
+            {%- else %}
+        {%- endmatch -%}
+        {% if !loop.last %}, {% endif %}
+    {%- endfor %}
+{%- endmacro %}
+
+
+{% macro arg_list_protocol(func) %}
+    {%- for arg in func.arguments() -%}
+        {% if config.omit_argument_labels() %}_ {% endif %}{{ arg.name()|var_name }}: {{ arg|type_name -}}
+        {%- if !loop.last %}, {% endif -%}
+    {%- endfor %}
+{%- endmacro %}
+
+
+{%- macro async(func) %}
+{%- if func.is_async() %}async{% endif %}
+{%- endmacro -%}
+
+{%- macro throws(func) %}
+{%- if func.throws() %}throws{% endif %}
+{%- endmacro -%}
+
+{%- macro try(func) %}
+{%- if func.throws() %}try {% else %}try! {% endif %}
+{%- endmacro -%}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/wrapper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/wrapper.swift
new file mode 100644
index 0000000000..c34d348efb
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/wrapper.swift
@@ -0,0 +1,68 @@
+// This file was autogenerated by some hot garbage in the `uniffi` crate.
+// Trust me, you don't want to mess with it!
+{%- import "macros.swift" as swift %}
+import Foundation
+{%- for imported_class in self.imports() %}
+import {{ imported_class }}
+{%- endfor %}
+
+// Depending on the consumer's build setup, the low-level FFI code
+// might be in a separate module, or it might be compiled inline into
+// this module. This is a bit of light hackery to work with both.
+#if canImport({{ config.ffi_module_name() }})
+import {{ config.ffi_module_name() }}
+#endif
+
+{% include "RustBufferTemplate.swift" %}
+{% include "Helpers.swift" %}
+
+// Public interface members begin here.
+{{ type_helper_code }}
+
+{%- if ci.has_async_fns() %}
+{% include "Async.swift" %}
+{%- endif %}
+
+{%- for func in ci.function_definitions() %}
+{%- include "TopLevelFunctionTemplate.swift" %}
+{%- endfor %}
+
+private enum InitializationResult {
+    case ok
+    case contractVersionMismatch
+    case apiChecksumMismatch
+}
+// Use a global variables to perform the versioning checks. Swift ensures that
+// the code inside is only computed once.
+private var initializationResult: InitializationResult {
+    // Get the bindings contract version from our ComponentInterface
+    let bindings_contract_version = {{ ci.uniffi_contract_version() }}
+    // Get the scaffolding contract version by calling the into the dylib
+    let scaffolding_contract_version = {{ ci.ffi_uniffi_contract_version().name() }}()
+    if bindings_contract_version != scaffolding_contract_version {
+        return InitializationResult.contractVersionMismatch
+    }
+
+    {%- for (name, expected_checksum) in ci.iter_checksums() %}
+    if ({{ name }}() != {{ expected_checksum }}) {
+        return InitializationResult.apiChecksumMismatch
+    }
+    {%- endfor %}
+
+    {% for fn in self.initialization_fns() -%}
+    {{ fn }}()
+    {% endfor -%}
+
+    return InitializationResult.ok
+}
+
+private func uniffiEnsureInitialized() {
+    switch initializationResult {
+    case .ok:
+        break
+    case .contractVersionMismatch:
+        fatalError("UniFFI contract version mismatch: try cleaning and rebuilding your project")
+    case .apiChecksumMismatch:
+        fatalError("UniFFI API checksum mismatch: try cleaning and rebuilding your project")
+    }
+}
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/test.rs b/third_party/rust/uniffi_bindgen/src/bindings/swift/test.rs
new file mode 100644
index 0000000000..c3b2f15277
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/test.rs
@@ -0,0 +1,202 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use crate::{
+    bindings::{RunScriptOptions, TargetLanguage},
+    library_mode::generate_bindings,
+};
+use anyhow::{bail, Context, Result};
+use camino::{Utf8Path, Utf8PathBuf};
+use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
+use std::ffi::OsStr;
+use std::fs::{read_to_string, File};
+use std::io::Write;
+use std::process::{Command, Stdio};
+use uniffi_testing::UniFFITestHelper;
+
+/// Run Swift tests for a UniFFI test fixture
+pub fn run_test(tmp_dir: &str, fixture_name: &str, script_file: &str) -> Result<()> {
+    run_script(
+        tmp_dir,
+        fixture_name,
+        script_file,
+        vec![],
+        &RunScriptOptions::default(),
+    )
+}
+
+/// Run a Swift script
+///
+/// This function will set things up so that the script can import the UniFFI bindings for a crate
+pub fn run_script(
+    tmp_dir: &str,
+    crate_name: &str,
+    script_file: &str,
+    args: Vec<String>,
+    options: &RunScriptOptions,
+) -> Result<()> {
+    let script_path = Utf8Path::new(".").join(script_file).canonicalize_utf8()?;
+    let test_helper = UniFFITestHelper::new(crate_name)?;
+    let out_dir = test_helper.create_out_dir(tmp_dir, &script_path)?;
+    let cdylib_path = test_helper.copy_cdylib_to_out_dir(&out_dir)?;
+    let generated_sources = GeneratedSources::new(crate_name, &cdylib_path, &out_dir)?;
+
+    // Compile the generated sources together to create a single swift module
+    compile_swift_module(
+        &out_dir,
+        &generated_sources.main_module,
+        &generated_sources.generated_swift_files,
+        &generated_sources.module_map,
+        options,
+    )?;
+
+    // Run the test script against compiled bindings
+    let mut command = create_command("swift", options);
+    command
+        .current_dir(&out_dir)
+        .arg("-I")
+        .arg(&out_dir)
+        .arg("-L")
+        .arg(&out_dir)
+        .args(calc_library_args(&out_dir)?)
+        .arg("-Xcc")
+        .arg(format!(
+            "-fmodule-map-file={}",
+            generated_sources.module_map
+        ))
+        .arg(&script_path)
+        .args(args);
+    let status = command
+        .spawn()
+        .context("Failed to spawn `swiftc` when running test script")?
+        .wait()
+        .context("Failed to wait for `swiftc` when running test script")?;
+    if !status.success() {
+        bail!("running `swift` to run test script failed ({:?})", command)
+    }
+    Ok(())
+}
+
+fn compile_swift_module<T: AsRef<OsStr>>(
+    out_dir: &Utf8Path,
+    module_name: &str,
+    sources: impl IntoIterator<Item = T>,
+    module_map: &Utf8Path,
+    options: &RunScriptOptions,
+) -> Result<()> {
+    let output_filename = format!("{DLL_PREFIX}testmod_{module_name}{DLL_SUFFIX}");
+    let mut command = create_command("swiftc", options);
+    command
+        .current_dir(out_dir)
+        .arg("-emit-module")
+        .arg("-module-name")
+        .arg(module_name)
+        .arg("-o")
+        .arg(output_filename)
+        .arg("-emit-library")
+        .arg("-Xcc")
+        .arg(format!("-fmodule-map-file={module_map}"))
+        .arg("-I")
+        .arg(out_dir)
+        .arg("-L")
+        .arg(out_dir)
+        .args(calc_library_args(out_dir)?)
+        .args(sources);
+    let status = command
+        .spawn()
+        .context("Failed to spawn `swiftc` when compiling bindings")?
+        .wait()
+        .context("Failed to wait for `swiftc` when compiling bindings")?;
+    if !status.success() {
+        bail!(
+            "running `swiftc` to compile bindings failed ({:?})",
+            command
+        )
+    };
+    Ok(())
+}
+
+// Stores sources generated by `uniffi-bindgen-swift`
+struct GeneratedSources {
+    main_module: String,
+    generated_swift_files: Vec<Utf8PathBuf>,
+    module_map: Utf8PathBuf,
+}
+
+impl GeneratedSources {
+    fn new(crate_name: &str, cdylib_path: &Utf8Path, out_dir: &Utf8Path) -> Result<Self> {
+        let sources =
+            generate_bindings(cdylib_path, None, &[TargetLanguage::Swift], out_dir, false)?;
+        let main_source = sources
+            .iter()
+            .find(|s| s.package.name == crate_name)
+            .unwrap();
+        let main_module = main_source.config.bindings.swift.module_name();
+        let modulemap_glob = glob(&out_dir.join("*.modulemap"))?;
+        let module_map = match modulemap_glob.len() {
+            0 => bail!("No modulemap files found in {out_dir}"),
+            // Normally we only generate 1 module map and can return it directly
+            1 => modulemap_glob.into_iter().next().unwrap(),
+            // When we use multiple UDL files in a test, for example the ext-types fixture,
+            // then we get multiple module maps and need to combine them
+            _ => {
+                let path = out_dir.join("combined.modulemap");
+                let mut f = File::create(&path)?;
+                write!(
+                    f,
+                    "{}",
+                    modulemap_glob
+                        .into_iter()
+                        .map(|path| Ok(read_to_string(path)?))
+                        .collect::<Result<Vec<String>>>()?
+                        .join("\n")
+                )?;
+                path
+            }
+        };
+
+        Ok(GeneratedSources {
+            main_module,
+            generated_swift_files: glob(&out_dir.join("*.swift"))?,
+            module_map,
+        })
+    }
+}
+
+fn create_command(program: &str, options: &RunScriptOptions) -> Command {
+    let mut command = Command::new(program);
+    if !options.show_compiler_messages {
+        // This prevents most compiler messages, but not remarks
+        command.arg("-suppress-warnings");
+        // This gets the remarks.  Note: swift will eventually get a `-supress-remarks` argument,
+        // maybe we can eventually move to that
+        command.stderr(Stdio::null());
+    }
+    command
+}
+
+// Wraps glob to use Utf8Paths and flattens errors
+fn glob(globspec: &Utf8Path) -> Result<Vec<Utf8PathBuf>> {
+    glob::glob(globspec.as_str())?
+        .map(|globresult| Ok(Utf8PathBuf::try_from(globresult?)?))
+        .collect()
+}
+
+fn calc_library_args(out_dir: &Utf8Path) -> Result<Vec<String>> {
+    let results = glob::glob(out_dir.join(format!("{DLL_PREFIX}*{DLL_SUFFIX}")).as_str())?;
+    results
+        .map(|globresult| {
+            let path = Utf8PathBuf::try_from(globresult.unwrap())?;
+            Ok(format!(
+                "-l{}",
+                path.file_name()
+                    .unwrap()
+                    .strip_prefix(DLL_PREFIX)
+                    .unwrap()
+                    .strip_suffix(DLL_SUFFIX)
+                    .unwrap()
+            ))
+        })
+        .collect()
+}