Add support for map type

Cargo.toml

@@ -341,18 +341,20 @@ wit-bindgen = { version = "0.50.0", default-features = false }
 wit-bindgen-rust-macro = { version = "0.50.0", default-features = false }
 
 # wasm-tools family:
-wasmparser = { version = "0.243.0", default-features = false, features = ['simd'] }
-wat = "1.243.0"
-wast = "243.0.0"
-wasmprinter = "0.243.0"
-wasm-encoder = "0.243.0"
-wasm-smith = "0.243.0"
-wasm-mutate = "0.243.0"
-wit-parser = "0.243.0"
-wit-component = "0.243.0"
-wasm-wave = "0.243.0"
-wasm-compose = "0.243.0"
-json-from-wast = "0.243.0"
+# TODO: well, these are not published to crates.io yet, so we need to use the git repository.
+# I am gonna remove this once the feature is "completed" and the crates are published to crates.io.
+wasmparser = { git = "https://github.com/bytecodealliance/wasm-tools", default-features = false, features = ['simd'] }
+wat = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wast = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasmprinter = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-encoder = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-smith = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-mutate = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wit-parser = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wit-component = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-wave = { git = "https://github.com/bytecodealliance/wasm-tools" }
+wasm-compose = { git = "https://github.com/bytecodealliance/wasm-tools" }
+json-from-wast = { git = "https://github.com/bytecodealliance/wasm-tools" }
 
 # Non-Bytecode Alliance maintained dependencies:
 # --------------------------

crates/c-api/CMakeLists.txt

@@ -32,7 +32,13 @@ else()
   endif()
 endif()
 
-set(WASMTIME_TARGET_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_TARGET}/${WASMTIME_BUILD_TYPE})
+# Respect CARGO_TARGET_DIR if set, allowing users to customize where Cargo
+# outputs build artifacts
+if(DEFINED ENV{CARGO_TARGET_DIR})
+  set(WASMTIME_TARGET_DIR $ENV{CARGO_TARGET_DIR}/${WASMTIME_TARGET}/${WASMTIME_BUILD_TYPE})
+else()
+  set(WASMTIME_TARGET_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_TARGET}/${WASMTIME_BUILD_TYPE})
+endif()
 
 if(WASMTIME_TARGET MATCHES "apple")
   set(WASMTIME_SHARED_FILES libwasmtime.dylib)

crates/c-api/include/wasmtime/component/types/val.h

@@ -335,6 +335,43 @@ WASM_API_EXTERN bool wasmtime_component_stream_type_ty(
     const wasmtime_component_stream_type_t *ty,
     struct wasmtime_component_valtype_t *type_ret);
 
+// ----------- maps ------------------------------------------------------------
+
+/// \brief Opaque type representing a component map type.
+typedef struct wasmtime_component_map_type wasmtime_component_map_type_t;
+
+/// \brief Clones a component map type.
+///
+/// The returned pointer must be deallocated with
+/// `wasmtime_component_map_type_delete`.
+WASM_API_EXTERN wasmtime_component_map_type_t *
+wasmtime_component_map_type_clone(const wasmtime_component_map_type_t *ty);
+
+/// \brief Compares two component map types for equality.
+WASM_API_EXTERN bool
+wasmtime_component_map_type_equal(const wasmtime_component_map_type_t *a,
+                                  const wasmtime_component_map_type_t *b);
+
+/// \brief Deallocates a component map type.
+WASM_API_EXTERN void
+wasmtime_component_map_type_delete(wasmtime_component_map_type_t *ptr);
+
+/// \brief Returns the key type of a component map type.
+///
+/// The returned type must be deallocated with
+/// `wasmtime_component_valtype_delete`.
+WASM_API_EXTERN void wasmtime_component_map_type_key(
+    const wasmtime_component_map_type_t *ty,
+    struct wasmtime_component_valtype_t *type_ret);
+
+/// \brief Returns the value type of a component map type.
+///
+/// The returned type must be deallocated with
+/// `wasmtime_component_valtype_delete`.
+WASM_API_EXTERN void wasmtime_component_map_type_value(
+    const wasmtime_component_map_type_t *ty,
+    struct wasmtime_component_valtype_t *type_ret);
+
 // ----------- valtype ---------------------------------------------------------
 
 /// \brief Value of #wasmtime_component_valtype_kind_t meaning that
@@ -415,6 +452,9 @@ WASM_API_EXTERN bool wasmtime_component_stream_type_ty(
 /// \brief Value of #wasmtime_component_valtype_kind_t meaning that
 /// #wasmtime_component_valtype_t is an `error context` WIT type.
 #define WASMTIME_COMPONENT_VALTYPE_ERROR_CONTEXT 25
+/// \brief Value of #wasmtime_component_valtype_kind_t meaning that
+/// #wasmtime_component_valtype_t is a `map` WIT type.
+#define WASMTIME_COMPONENT_VALTYPE_MAP 26
 
 /// \brief Discriminant used in #wasmtime_component_valtype_t::kind
 typedef uint8_t wasmtime_component_valtype_kind_t;
@@ -457,6 +497,9 @@ typedef union wasmtime_component_valtype_union {
   /// Field used if #wasmtime_component_valtype_t::kind is
   /// #WASMTIME_COMPONENT_VALTYPE_STREAM
   wasmtime_component_stream_type_t *stream;
+  /// Field used if #wasmtime_component_valtype_t::kind is
+  /// #WASMTIME_COMPONENT_VALTYPE_MAP
+  wasmtime_component_map_type_t *map;
 } wasmtime_component_valtype_union_t;
 
 /// \brief Represents a single value type in the component model.

crates/c-api/include/wasmtime/component/types/val.hh

@@ -178,6 +178,19 @@ class StreamType {
   std::optional<ValType> ty() const;
 };
 
+/**
+ * \brief Represents a component map type.
+ */
+class MapType {
+  WASMTIME_CLONE_EQUAL_WRAPPER(MapType, wasmtime_component_map_type);
+
+  /// Returns the key type of this map type.
+  ValType key() const;
+
+  /// Returns the value type of this map type.
+  ValType value() const;
+};
+
 /**
  * \brief Represents a component value type.
  */
@@ -382,6 +395,12 @@ public:
     ty.of.stream = stream.capi_release();
   }
 
+  /// Creates a map value type.
+  ValType(MapType map) {
+    ty.kind = WASMTIME_COMPONENT_VALTYPE_MAP;
+    ty.of.map = map.capi_release();
+  }
+
   /// Returns the kind of this value type.
   wasmtime_component_valtype_kind_t kind() const { return ty.kind; }
 
@@ -481,6 +500,9 @@ public:
     return ty.kind == WASMTIME_COMPONENT_VALTYPE_ERROR_CONTEXT;
   }
 
+  /// Returns true if this is a map type.
+  bool is_map() const { return ty.kind == WASMTIME_COMPONENT_VALTYPE_MAP; }
+
   /// Returns the list type, asserting that this is indeed a list.
   const ListType &list() const {
     assert(is_list());
@@ -553,6 +575,12 @@ public:
     return *StreamType::from_capi(&ty.of.stream);
   }
 
+  /// Returns the map type, asserting that this is indeed a map.
+  const MapType &map() const {
+    assert(is_map());
+    return *MapType::from_capi(&ty.of.map);
+  }
+
   /// \brief Returns the underlying C API pointer.
   const wasmtime_component_valtype_t *capi() const { return &ty; }
   /// \brief Returns the underlying C API pointer.
@@ -640,6 +668,18 @@ inline std::optional<ValType> StreamType::ty() const {
   return std::nullopt;
 }
 
+inline ValType MapType::key() const {
+  wasmtime_component_valtype_t type_ret;
+  wasmtime_component_map_type_key(ptr.get(), &type_ret);
+  return ValType(std::move(type_ret));
+}
+
+inline ValType MapType::value() const {
+  wasmtime_component_valtype_t type_ret;
+  wasmtime_component_map_type_value(ptr.get(), &type_ret);
+  return ValType(std::move(type_ret));
+}
+
 } // namespace component
 } // namespace wasmtime
 

crates/c-api/include/wasmtime/component/val.h

@@ -266,9 +266,13 @@ typedef uint8_t wasmtime_component_valkind_t;
 /// \brief Value of #wasmtime_component_valkind_t meaning that
 /// #wasmtime_component_val_t is a resource
 #define WASMTIME_COMPONENT_RESOURCE 21
+/// \brief Value of #wasmtime_component_valkind_t meaning that
+/// #wasmtime_component_val_t is a map
+#define WASMTIME_COMPONENT_MAP 22
 
 struct wasmtime_component_val;
 struct wasmtime_component_valrecord_entry;
+struct wasmtime_component_valmap_entry;
 
 #define DECLARE_VEC(name, type)                                                \
   /** \brief A vec of a type */                                                \
@@ -296,6 +300,8 @@ DECLARE_VEC(wasmtime_component_valrecord,
             struct wasmtime_component_valrecord_entry)
 DECLARE_VEC(wasmtime_component_valtuple, struct wasmtime_component_val)
 DECLARE_VEC(wasmtime_component_valflags, wasm_name_t)
+DECLARE_VEC(wasmtime_component_valmap,
+            struct wasmtime_component_valmap_entry)
 
 #undef DECLARE_VEC
 
@@ -366,6 +372,8 @@ typedef union {
   wasmtime_component_valresult_t result;
   /// Field used if #wasmtime_component_val_t::kind is #WASMTIME_COMPONENT_FLAGS
   wasmtime_component_valflags_t flags;
+  /// Field used if #wasmtime_component_val_t::kind is #WASMTIME_COMPONENT_MAP
+  wasmtime_component_valmap_t map;
   /// Field used if #wasmtime_component_val_t::kind is
   /// #WASMTIME_COMPONENT_RESOURCE
   wasmtime_component_resource_any_t *resource;
@@ -389,6 +397,15 @@ typedef struct wasmtime_component_valrecord_entry {
   wasmtime_component_val_t val;
 } wasmtime_component_valrecord_entry_t;
 
+/// \brief A pair of a key and a value that represents one entry in a value
+/// with kind #WASMTIME_COMPONENT_MAP
+typedef struct wasmtime_component_valmap_entry {
+  /// The key of this entry
+  wasmtime_component_val_t key;
+  /// The value of this entry
+  wasmtime_component_val_t value;
+} wasmtime_component_valmap_entry_t;
+
 /// \brief Allocates a new `wasmtime_component_val_t` on the heap, initializing
 /// it with the contents of `val`.
 ///

crates/c-api/src/component/types/val.rs

@@ -31,6 +31,7 @@ pub enum wasmtime_component_valtype_t {
     Future(Box<wasmtime_component_future_type_t>),
     Stream(Box<wasmtime_component_stream_type_t>),
     ErrorContext,
+    Map(Box<wasmtime_component_map_type_t>),
 }
 
 impl From<Type> for wasmtime_component_valtype_t {
@@ -61,6 +62,7 @@ impl From<Type> for wasmtime_component_valtype_t {
             Type::Borrow(ty) => Self::Borrow(Box::new(ty.into())),
             Type::Future(ty) => Self::Future(Box::new(ty.into())),
             Type::Stream(ty) => Self::Stream(Box::new(ty.into())),
+            Type::Map(ty) => Self::Map(Box::new(ty.into())),
             Type::ErrorContext => Self::ErrorContext,
         }
     }
@@ -108,6 +110,33 @@ pub extern "C" fn wasmtime_component_list_type_element(
     type_ret.write(ty.ty.ty().into());
 }
 
+type_wrapper! {
+    #[derive(PartialEq)]
+    pub struct wasmtime_component_map_type_t {
+        pub(crate) ty: Map,
+    }
+
+    clone: wasmtime_component_map_type_clone,
+    delete: wasmtime_component_map_type_delete,
+    equal: wasmtime_component_map_type_equal,
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn wasmtime_component_map_type_key(
+    ty: &wasmtime_component_map_type_t,
+    type_ret: &mut MaybeUninit<wasmtime_component_valtype_t>,
+) {
+    type_ret.write(ty.ty.key().into());
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn wasmtime_component_map_type_value(
+    ty: &wasmtime_component_map_type_t,
+    type_ret: &mut MaybeUninit<wasmtime_component_valtype_t>,
+) {
+    type_ret.write(ty.ty.value().into());
+}
+
 type_wrapper! {
     #[derive(PartialEq)]
     pub struct wasmtime_component_record_type_t {

crates/c-api/src/component/val.rs

@@ -45,6 +45,15 @@ crate::declare_vecs! {
         copy: wasmtime_component_valflags_copy,
         delete: wasmtime_component_valflags_delete,
     )
+    (
+        name: wasmtime_component_valmap_t,
+        ty: wasmtime_component_valmap_entry_t,
+        new: wasmtime_component_valmap_new,
+        empty: wasmtime_component_valmap_new_empty,
+        uninit: wasmtime_component_valmap_new_uninit,
+        copy: wasmtime_component_valmap_copy,
+        delete: wasmtime_component_valmap_delete,
+    )
 }
 
 impl From<&wasmtime_component_vallist_t> for Vec<Val> {
@@ -63,13 +72,43 @@ impl From<&[Val]> for wasmtime_component_vallist_t {
     }
 }
 
+impl From<&wasmtime_component_valmap_t> for Vec<(Val, Val)> {
+    fn from(value: &wasmtime_component_valmap_t) -> Self {
+        value
+            .as_slice()
+            .iter()
+            .map(|entry| (Val::from(&entry.key), Val::from(&entry.value)))
+            .collect()
+    }
+}
+
+impl From<&[(Val, Val)]> for wasmtime_component_valmap_t {
+    fn from(value: &[(Val, Val)]) -> Self {
+        value
+            .iter()
+            .map(|(k, v)| wasmtime_component_valmap_entry_t {
+                key: wasmtime_component_val_t::from(k),
+                value: wasmtime_component_val_t::from(v),
+            })
+            .collect::<Vec<_>>()
+            .into()
+    }
+}
+
 #[derive(Clone)]
 #[repr(C)]
 pub struct wasmtime_component_valrecord_entry_t {
     name: wasm_name_t,
     val: wasmtime_component_val_t,
 }
 
+#[derive(Clone, Default)]
+#[repr(C)]
+pub struct wasmtime_component_valmap_entry_t {
+    key: wasmtime_component_val_t,
+    value: wasmtime_component_val_t,
+}
+
 impl Default for wasmtime_component_valrecord_entry_t {
     fn default() -> Self {
         Self {
@@ -233,6 +272,7 @@ pub enum wasmtime_component_val_t {
     Option(Option<Box<Self>>),
     Result(wasmtime_component_valresult_t),
     Flags(wasmtime_component_valflags_t),
+    Map(wasmtime_component_valmap_t),
     Resource(Box<wasmtime_component_resource_any_t>),
 }
 
@@ -275,6 +315,7 @@ impl From<&wasmtime_component_val_t> for Val {
             }
             wasmtime_component_val_t::Result(x) => Val::Result(x.into()),
             wasmtime_component_val_t::Flags(x) => Val::Flags(x.into()),
+            wasmtime_component_val_t::Map(x) => Val::Map(x.into()),
             wasmtime_component_val_t::Resource(x) => Val::Resource(x.resource),
         }
     }
@@ -309,6 +350,7 @@ impl From<&Val> for wasmtime_component_val_t {
             ),
             Val::Result(x) => wasmtime_component_val_t::Result(x.into()),
             Val::Flags(x) => wasmtime_component_val_t::Flags(x.as_slice().into()),
+            Val::Map(x) => wasmtime_component_val_t::Map(x.as_slice().into()),
             Val::Resource(resource_any) => {
                 wasmtime_component_val_t::Resource(Box::new(wasmtime_component_resource_any_t {
                     resource: *resource_any,

crates/c-api/tests/component/types.cc

@@ -187,6 +187,15 @@ TEST(types, valtype_list) {
   EXPECT_TRUE(elem.is_u8());
 }
 
+TEST(types, valtype_map) {
+  auto ty =
+      result("(component (import \"f\" (func (result (map u32 string)))))");
+  EXPECT_TRUE(ty.is_map());
+  auto map_ty = ty.map();
+  EXPECT_TRUE(map_ty.key().is_u32());
+  EXPECT_TRUE(map_ty.value().is_string());
+}
+
 TEST(types, valtype_record) {
   auto ty = result(R"(
   (component

crates/environ/src/compile/module_environ.rs

@@ -331,10 +331,7 @@ impl<'a, 'data> ModuleEnvironment<'a, 'data> {
             Payload::ImportSection(imports) => {
                 self.validator.import_section(&imports)?;
 
-                let cnt = usize::try_from(imports.count()).unwrap();
-                self.result.module.initializers.reserve(cnt);
-
-                for entry in imports {
+                for entry in imports.into_imports() {
                     let import = entry?;
                     let ty = match import.ty {
                         TypeRef::Func(index) => {