Add support for map type

.gitignore

@@ -22,6 +22,7 @@ publish
 vendor
 examples/build
 examples/.cache
+crates/c-api/build
 *.coredump
 *.smt2
 cranelift/isle/veri/veri_engine/test_output

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 +300,7 @@ 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 +371,8 @@ 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 +396,15 @@ 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/include/wasmtime/component/val.hh

@@ -417,6 +417,63 @@ public:
   }
 };
 
+/// \brief Class representing an entry in a map value.
+class MapEntry {
+  friend class Map;
+
+  wasmtime_component_valmap_entry_t entry;
+
+  // This value can't be constructed or destructed, it's only used in iteration
+  // of `Map`.
+  MapEntry() = delete;
+  ~MapEntry() = delete;
+
+  static const MapEntry *
+  from_capi(const wasmtime_component_valmap_entry_t *capi) {
+    return reinterpret_cast<const MapEntry *>(capi);
+  }
+
+public:
+  /// \brief Returns the key of this map entry.
+  const Val &key() const { return *detail::val_from_capi(&entry.key); }
+
+  /// \brief Returns the value of this map entry.
+  const Val &value() const { return *detail::val_from_capi(&entry.value); }
+};
+
+/// \brief Class representing a component model map, a collection of key/value
+/// pairs.
+class Map {
+  friend class Val;
+
+  VAL_REPR(Map, wasmtime_component_valmap_t);
+
+  static void transfer(Raw &&from, Raw &to) {
+    to = from;
+    from.size = 0;
+    from.data = nullptr;
+  }
+
+  void copy(const Raw &other) { wasmtime_component_valmap_copy(&raw, &other); }
+
+  void destroy() { wasmtime_component_valmap_delete(&raw); }
+
+public:
+  /// Creates a new map from the key/value pairs provided.
+  Map(std::vector<std::pair<Val, Val>> entries);
+
+  /// \brief Returns the number of entries in the map.
+  size_t size() const { return raw.size; }
+
+  /// \brief Returns an iterator to the beginning of the map entries.
+  const MapEntry *begin() const { return MapEntry::from_capi(raw.data); }
+
+  /// \brief Returns an iterator to the end of the map entries.
+  const MapEntry *end() const {
+    return MapEntry::from_capi(raw.data + raw.size);
+  }
+};
+
 class ResourceHost;
 
 /// Class representing a component model `resource` value which is either a
@@ -644,6 +701,12 @@ public:
     Flags::transfer(std::move(f.raw), raw.of.flags);
   }
 
+  /// Creates a new map value.
+  Val(Map m) {
+    raw.kind = WASMTIME_COMPONENT_MAP;
+    Map::transfer(std::move(m.raw), raw.of.map);
+  }
+
   /// Creates a new resource value.
   Val(ResourceAny r) {
     raw.kind = WASMTIME_COMPONENT_RESOURCE;
@@ -833,11 +896,20 @@ public:
   /// \brief Returns whether this value is a resource.
   bool is_resource() const { return raw.kind == WASMTIME_COMPONENT_RESOURCE; }
 
-  /// \brief Returns the flags value, only valid if `is_flags()`.
+  /// \brief Returns the resource value, only valid if `is_resource()`.
   const ResourceAny &get_resource() const {
     assert(is_resource());
     return *ResourceAny::from_capi(&raw.of.resource);
   }
+
+  /// \brief Returns whether this value is a map.
+  bool is_map() const { return raw.kind == WASMTIME_COMPONENT_MAP; }
+
+  /// \brief Returns the map value, only valid if `is_map()`.
+  const Map &get_map() const {
+    assert(is_map());
+    return *Map::from_capi(&raw.of.map);
+  }
 };
 
 #undef VAL_REPR
@@ -852,6 +924,16 @@ inline Record::Record(std::vector<std::pair<std::string_view, Val>> entries) {
   }
 }
 
+inline Map::Map(std::vector<std::pair<Val, Val>> entries) {
+  wasmtime_component_valmap_new_uninit(&raw, entries.size());
+  auto dst = raw.data;
+  for (auto &&[key, val] : entries) {
+    new (&dst->key) Val(std::move(key));
+    new (&dst->value) Val(std::move(val));
+    dst++;
+  }
+}
+
 inline List::List(std::vector<Val> values) {
   wasmtime_component_vallist_new_uninit(&raw, values.size());
   auto dst = raw.data;

crates/c-api/include/wasmtime/config.h

@@ -816,6 +816,15 @@ WASM_API_EXTERN void wasmtime_pooling_allocation_strategy_set(
  */
 WASMTIME_CONFIG_PROP(void, wasm_component_model, bool)
 
+/**
+ * \brief Configures whether the WebAssembly component-model map type will be
+ * enabled for compilation.
+ *
+ * For more information see the Rust documentation at
+ * https://docs.wasmtime.dev/api/wasmtime/struct.Config.html#method.wasm_component_model_map.
+ */
+WASMTIME_CONFIG_PROP(void, wasm_component_model_map, bool)
+
 #endif // WASMTIME_FEATURE_COMPONENT_MODEL
 
 #ifdef __cplusplus

crates/c-api/include/wasmtime/config.hh

@@ -407,6 +407,14 @@ class Config {
   void wasm_component_model(bool enable) {
     wasmtime_config_wasm_component_model_set(ptr.get(), enable);
   }
+
+  /// \brief Configures whether the WebAssembly component model map type will be
+  /// enabled
+  ///
+  /// https://docs.wasmtime.dev/api/wasmtime/struct.Config.html#method.wasm_component_model_map
+  void wasm_component_model_map(bool enable) {
+    wasmtime_config_wasm_component_model_map_set(ptr.get(), enable);
+  }
 #endif // WASMTIME_FEATURE_COMPONENT_MODEL
 
 #ifdef WASMTIME_FEATURE_PARALLEL_COMPILATION

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

@@ -10,6 +10,14 @@ pub extern "C" fn wasmtime_config_wasm_component_model_set(c: &mut wasm_config_t
     c.config.wasm_component_model(enable);
 }
 
+#[unsafe(no_mangle)]
+pub extern "C" fn wasmtime_config_wasm_component_model_map_set(
+    c: &mut wasm_config_t,
+    enable: bool,
+) {
+    c.config.wasm_component_model_map(enable);
+}
+
 #[derive(Clone)]
 #[repr(transparent)]
 pub struct wasmtime_component_t {