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1 files changed, 1823 insertions, 0 deletions

diff --git a/vendor/github.com/mitjafelicijan/go-tree-sitter/wasm_store.c b/vendor/github.com/mitjafelicijan/go-tree-sitter/wasm_store.c
new file mode 100644
index 0000000..7860c92
--- /dev/null
+++ b/vendor/github.com/mitjafelicijan/go-tree-sitter/wasm_store.c
@@ -0,0 +1,1823 @@
+#include "api.h"
+#include "./parser.h"
+#include <stdint.h>
+
+#ifdef TREE_SITTER_FEATURE_WASM
+
+#include <wasmtime.h>
+#include <wasm.h>
+#include <string.h>
+#include "./alloc.h"
+#include "./array.h"
+#include "./atomic.h"
+#include "./language.h"
+#include "./lexer.h"
+#include "./wasm_store.h"
+#include "./wasm/wasm-stdlib.h"
+
+#define array_len(a) (sizeof(a) / sizeof(a[0]))
+
+// The following symbols from the C and C++ standard libraries are available
+// for external scanners to use.
+const char *STDLIB_SYMBOLS[] = {
+  #include "./stdlib-symbols.txt"
+};
+
+// The contents of the `dylink.0` custom section of a wasm module,
+// as specified by the current WebAssembly dynamic linking ABI proposal.
+typedef struct {
+  uint32_t memory_size;
+  uint32_t memory_align;
+  uint32_t table_size;
+  uint32_t table_align;
+} WasmDylinkInfo;
+
+// WasmLanguageId - A pointer used to identify a language. This language id is
+// reference-counted, so that its ownership can be shared between the language
+// itself and the instances of the language that are held in wasm stores.
+typedef struct {
+  volatile uint32_t ref_count;
+  volatile uint32_t is_language_deleted;
+} WasmLanguageId;
+
+// LanguageWasmModule - Additional data associated with a wasm-backed
+// `TSLanguage`. This data is read-only and does not reference a particular
+// wasm store, so it can be shared by all users of a `TSLanguage`. A pointer to
+// this is stored on the language itself.
+typedef struct {
+  volatile uint32_t ref_count;
+  WasmLanguageId *language_id;
+  wasmtime_module_t *module;
+  const char *name;
+  char *symbol_name_buffer;
+  char *field_name_buffer;
+  WasmDylinkInfo dylink_info;
+} LanguageWasmModule;
+
+// LanguageWasmInstance - Additional data associated with an instantiation of
+// a `TSLanguage` in a particular wasm store. The wasm store holds one of
+// these structs for each language that it has instantiated.
+typedef struct {
+  WasmLanguageId *language_id;
+  wasmtime_instance_t instance;
+  int32_t external_states_address;
+  int32_t lex_main_fn_index;
+  int32_t lex_keyword_fn_index;
+  int32_t scanner_create_fn_index;
+  int32_t scanner_destroy_fn_index;
+  int32_t scanner_serialize_fn_index;
+  int32_t scanner_deserialize_fn_index;
+  int32_t scanner_scan_fn_index;
+} LanguageWasmInstance;
+
+typedef struct {
+  uint32_t reset_heap;
+  uint32_t proc_exit;
+  uint32_t abort;
+  uint32_t assert_fail;
+  uint32_t notify_memory_growth;
+  uint32_t debug_message;
+  uint32_t at_exit;
+  uint32_t args_get;
+  uint32_t args_sizes_get;
+} BuiltinFunctionIndices;
+
+// TSWasmStore - A struct that allows a given `Parser` to use wasm-backed
+// languages. This struct is mutable, and can only be used by one parser at a
+// time.
+struct TSWasmStore {
+  wasm_engine_t *engine;
+  wasmtime_store_t *store;
+  wasmtime_table_t function_table;
+  wasmtime_memory_t memory;
+  TSLexer *current_lexer;
+  LanguageWasmInstance *current_instance;
+  Array(LanguageWasmInstance) language_instances;
+  uint32_t current_memory_offset;
+  uint32_t current_function_table_offset;
+  uint32_t *stdlib_fn_indices;
+  BuiltinFunctionIndices builtin_fn_indices;
+  wasmtime_global_t stack_pointer_global;
+  wasm_globaltype_t *const_i32_type;
+  bool has_error;
+  uint32_t lexer_address;
+  uint32_t serialization_buffer_address;
+};
+
+typedef Array(char) StringData;
+
+// LanguageInWasmMemory - The memory layout of a `TSLanguage` when compiled to
+// wasm32. This is used to copy static language data out of the wasm memory.
+typedef struct {
+  uint32_t version;
+  uint32_t symbol_count;
+  uint32_t alias_count;
+  uint32_t token_count;
+  uint32_t external_token_count;
+  uint32_t state_count;
+  uint32_t large_state_count;
+  uint32_t production_id_count;
+  uint32_t field_count;
+  uint16_t max_alias_sequence_length;
+  int32_t parse_table;
+  int32_t small_parse_table;
+  int32_t small_parse_table_map;
+  int32_t parse_actions;
+  int32_t symbol_names;
+  int32_t field_names;
+  int32_t field_map_slices;
+  int32_t field_map_entries;
+  int32_t symbol_metadata;
+  int32_t public_symbol_map;
+  int32_t alias_map;
+  int32_t alias_sequences;
+  int32_t lex_modes;
+  int32_t lex_fn;
+  int32_t keyword_lex_fn;
+  TSSymbol keyword_capture_token;
+  struct {
+    int32_t states;
+    int32_t symbol_map;
+    int32_t create;
+    int32_t destroy;
+    int32_t scan;
+    int32_t serialize;
+    int32_t deserialize;
+  } external_scanner;
+  int32_t primary_state_ids;
+} LanguageInWasmMemory;
+
+// LexerInWasmMemory - The memory layout of a `TSLexer` when compiled to wasm32.
+// This is used to copy mutable lexing state in and out of the wasm memory.
+typedef struct {
+  int32_t lookahead;
+  TSSymbol result_symbol;
+  int32_t advance;
+  int32_t mark_end;
+  int32_t get_column;
+  int32_t is_at_included_range_start;
+  int32_t eof;
+} LexerInWasmMemory;
+
+static volatile uint32_t NEXT_LANGUAGE_ID;
+
+// Linear memory layout:
+// [ <-- stack | stdlib statics | lexer | serialization_buffer | language statics --> | heap --> ]
+#define MAX_MEMORY_SIZE (128 * 1024 * 1024 / MEMORY_PAGE_SIZE)
+
+/************************
+ * WasmDylinkMemoryInfo
+ ***********************/
+
+static uint8_t read_u8(const uint8_t **p, const uint8_t *end) {
+  return *(*p)++;
+}
+
+static inline uint64_t read_uleb128(const uint8_t **p, const uint8_t *end) {
+  uint64_t value = 0;
+  unsigned shift = 0;
+  do {
+    if (*p == end)  return UINT64_MAX;
+    value += (uint64_t)(**p & 0x7f) << shift;
+    shift += 7;
+  } while (*((*p)++) >= 128);
+  return value;
+}
+
+static bool wasm_dylink_info__parse(
+  const uint8_t *bytes,
+  size_t length,
+  WasmDylinkInfo *info
+) {
+  const uint8_t WASM_MAGIC_NUMBER[4] = {0, 'a', 's', 'm'};
+  const uint8_t WASM_VERSION[4] = {1, 0, 0, 0};
+  const uint8_t WASM_CUSTOM_SECTION = 0x0;
+  const uint8_t WASM_DYLINK_MEM_INFO = 0x1;
+
+  const uint8_t *p = bytes;
+  const uint8_t *end = bytes + length;
+
+  if (length < 8) return false;
+  if (memcmp(p, WASM_MAGIC_NUMBER, 4) != 0) return false;
+  p += 4;
+  if (memcmp(p, WASM_VERSION, 4) != 0) return false;
+  p += 4;
+
+  while (p < end) {
+    uint8_t section_id = read_u8(&p, end);
+    uint32_t section_length = read_uleb128(&p, end);
+    const uint8_t *section_end = p + section_length;
+    if (section_end > end) return false;
+
+    if (section_id == WASM_CUSTOM_SECTION) {
+      uint32_t name_length = read_uleb128(&p, section_end);
+      const uint8_t *name_end = p + name_length;
+      if (name_end > section_end) return false;
+
+      if (name_length == 8 && memcmp(p, "dylink.0", 8) == 0) {
+        p = name_end;
+        while (p < section_end) {
+          uint8_t subsection_type = read_u8(&p, section_end);
+          uint32_t subsection_size = read_uleb128(&p, section_end);
+          const uint8_t *subsection_end = p + subsection_size;
+          if (subsection_end > section_end) return false;
+          if (subsection_type == WASM_DYLINK_MEM_INFO) {
+            info->memory_size = read_uleb128(&p, subsection_end);
+            info->memory_align = read_uleb128(&p, subsection_end);
+            info->table_size = read_uleb128(&p, subsection_end);
+            info->table_align = read_uleb128(&p, subsection_end);
+            return true;
+          }
+          p = subsection_end;
+        }
+      }
+    }
+    p = section_end;
+  }
+  return false;
+}
+
+/*******************************************
+ * Native callbacks exposed to wasm modules
+ *******************************************/
+
+ static wasm_trap_t *callback__abort(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  return wasmtime_trap_new("wasm module called abort", 24);
+}
+
+static wasm_trap_t *callback__debug_message(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  wasmtime_context_t *context = wasmtime_caller_context(caller);
+  TSWasmStore *store = env;
+  assert(args_and_results_len == 2);
+  uint32_t string_address = args_and_results[0].i32;
+  uint32_t value = args_and_results[1].i32;
+  uint8_t *memory = wasmtime_memory_data(context, &store->memory);
+  printf("DEBUG: %s %u\n", &memory[string_address], value);
+  return NULL;
+}
+
+static wasm_trap_t *callback__noop(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  return NULL;
+}
+
+static wasm_trap_t *callback__lexer_advance(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  wasmtime_context_t *context = wasmtime_caller_context(caller);
+  assert(args_and_results_len == 2);
+
+  TSWasmStore *store = env;
+  TSLexer *lexer = store->current_lexer;
+  bool skip = args_and_results[1].i32;
+  lexer->advance(lexer, skip);
+
+  uint8_t *memory = wasmtime_memory_data(context, &store->memory);
+  memcpy(&memory[store->lexer_address], &lexer->lookahead, sizeof(lexer->lookahead));
+  return NULL;
+}
+
+static wasm_trap_t *callback__lexer_mark_end(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  TSWasmStore *store = env;
+  TSLexer *lexer = store->current_lexer;
+  lexer->mark_end(lexer);
+  return NULL;
+}
+
+static wasm_trap_t *callback__lexer_get_column(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  TSWasmStore *store = env;
+  TSLexer *lexer = store->current_lexer;
+  uint32_t result = lexer->get_column(lexer);
+  args_and_results[0].i32 = result;
+  return NULL;
+}
+
+static wasm_trap_t *callback__lexer_is_at_included_range_start(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  TSWasmStore *store = env;
+  TSLexer *lexer = store->current_lexer;
+  bool result = lexer->is_at_included_range_start(lexer);
+  args_and_results[0].i32 = result;
+  return NULL;
+}
+
+static wasm_trap_t *callback__lexer_eof(
+  void *env,
+  wasmtime_caller_t* caller,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  TSWasmStore *store = env;
+  TSLexer *lexer = store->current_lexer;
+  bool result = lexer->eof(lexer);
+  args_and_results[0].i32 = result;
+  return NULL;
+}
+
+typedef struct {
+  uint32_t *storage_location;
+  wasmtime_func_unchecked_callback_t callback;
+  wasm_functype_t *type;
+} FunctionDefinition;
+
+static void *copy(const void *data, size_t size) {
+  void *result = ts_malloc(size);
+  memcpy(result, data, size);
+  return result;
+}
+
+static void *copy_unsized_static_array(
+  const uint8_t *data,
+  int32_t start_address,
+  const int32_t all_addresses[],
+  size_t address_count
+) {
+  int32_t end_address = 0;
+  for (unsigned i = 0; i < address_count; i++) {
+    if (all_addresses[i] > start_address) {
+      if (!end_address || all_addresses[i] < end_address) {
+        end_address = all_addresses[i];
+      }
+    }
+  }
+
+  if (!end_address) return NULL;
+  size_t size = end_address - start_address;
+  void *result = ts_malloc(size);
+  memcpy(result, &data[start_address], size);
+  return result;
+}
+
+static void *copy_strings(
+  const uint8_t *data,
+  int32_t array_address,
+  size_t count,
+  StringData *string_data
+) {
+  const char **result = ts_malloc(count * sizeof(char *));
+  for (unsigned i = 0; i < count; i++) {
+    int32_t address;
+    memcpy(&address, &data[array_address + i * sizeof(address)], sizeof(address));
+    if (address == 0) {
+      result[i] = (const char *)-1;
+    } else {
+      const uint8_t *string = &data[address];
+      uint32_t len = strlen((const char *)string);
+      result[i] = (const char *)(uintptr_t)string_data->size;
+      array_extend(string_data, len + 1, string);
+    }
+  }
+  for (unsigned i = 0; i < count; i++) {
+    if (result[i] == (const char *)-1) {
+      result[i] = NULL;
+    } else {
+      result[i] = string_data->contents + (uintptr_t)result[i];
+    }
+  }
+  return result;
+}
+
+static bool name_eq(const wasm_name_t *name, const char *string) {
+  return strncmp(string, name->data, name->size) == 0;
+}
+
+static inline wasm_functype_t* wasm_functype_new_4_0(
+  wasm_valtype_t* p1,
+  wasm_valtype_t* p2,
+  wasm_valtype_t* p3,
+  wasm_valtype_t* p4
+) {
+  wasm_valtype_t* ps[4] = {p1, p2, p3, p4};
+  wasm_valtype_vec_t params, results;
+  wasm_valtype_vec_new(&params, 4, ps);
+  wasm_valtype_vec_new_empty(&results);
+  return wasm_functype_new(&params, &results);
+}
+
+#define format(output, ...) \
+  do { \
+    size_t message_length = snprintf((char *)NULL, 0, __VA_ARGS__); \
+    *output = ts_malloc(message_length + 1); \
+    snprintf(*output, message_length + 1, __VA_ARGS__); \
+  } while (0)
+
+WasmLanguageId *language_id_new() {
+  WasmLanguageId *self = ts_malloc(sizeof(WasmLanguageId));
+  self->is_language_deleted = false;
+  self->ref_count = 1;
+  return self;
+}
+
+WasmLanguageId *language_id_clone(WasmLanguageId *self) {
+  atomic_inc(&self->ref_count);
+  return self;
+}
+
+void language_id_delete(WasmLanguageId *self) {
+  if (atomic_dec(&self->ref_count) == 0) {
+    ts_free(self);
+  }
+}
+
+static wasmtime_extern_t get_builtin_extern(
+  wasmtime_table_t *table,
+  unsigned index
+) {
+  return (wasmtime_extern_t) {
+    .kind = WASMTIME_EXTERN_FUNC,
+    .of.func = (wasmtime_func_t) {
+      .store_id = table->store_id,
+      .index = index
+    }
+  };
+}
+
+static bool ts_wasm_store__provide_builtin_import(
+  TSWasmStore *self,
+  const wasm_name_t *import_name,
+  wasmtime_extern_t *import
+) {
+  wasmtime_error_t *error = NULL;
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+
+  // Dynamic linking parameters
+  if (name_eq(import_name, "__memory_base")) {
+    wasmtime_val_t value = WASM_I32_VAL(self->current_memory_offset);
+    wasmtime_global_t global;
+    error = wasmtime_global_new(context, self->const_i32_type, &value, &global);
+    assert(!error);
+    *import = (wasmtime_extern_t) {.kind = WASMTIME_EXTERN_GLOBAL, .of.global = global};
+  } else if (name_eq(import_name, "__table_base")) {
+    wasmtime_val_t value = WASM_I32_VAL(self->current_function_table_offset);
+    wasmtime_global_t global;
+    error = wasmtime_global_new(context, self->const_i32_type, &value, &global);
+    assert(!error);
+    *import = (wasmtime_extern_t) {.kind = WASMTIME_EXTERN_GLOBAL, .of.global = global};
+  } else if (name_eq(import_name, "__stack_pointer")) {
+    *import = (wasmtime_extern_t) {.kind = WASMTIME_EXTERN_GLOBAL, .of.global = self->stack_pointer_global};
+  } else if (name_eq(import_name, "__indirect_function_table")) {
+    *import = (wasmtime_extern_t) {.kind = WASMTIME_EXTERN_TABLE, .of.table = self->function_table};
+  } else if (name_eq(import_name, "memory")) {
+    *import = (wasmtime_extern_t) {.kind = WASMTIME_EXTERN_MEMORY, .of.memory = self->memory};
+  }
+
+  // Builtin functions
+  else if (name_eq(import_name, "__assert_fail")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.assert_fail);
+  } else if (name_eq(import_name, "__cxa_atexit")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.at_exit);
+  } else if (name_eq(import_name, "args_get")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.args_get);
+  } else if (name_eq(import_name, "args_sizes_get")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.args_sizes_get);
+  } else if (name_eq(import_name, "abort")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.abort);
+  } else if (name_eq(import_name, "proc_exit")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.proc_exit);
+  } else if (name_eq(import_name, "emscripten_notify_memory_growth")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.notify_memory_growth);
+  } else if (name_eq(import_name, "tree_sitter_debug_message")) {
+    *import = get_builtin_extern(&self->function_table, self->builtin_fn_indices.debug_message);
+  } else {
+    return false;
+  }
+
+  return true;
+}
+
+static bool ts_wasm_store__call_module_initializer(
+  TSWasmStore *self,
+  const wasm_name_t *export_name,
+  wasmtime_extern_t *export,
+  wasm_trap_t **trap
+) {
+  if (
+    name_eq(export_name, "_initialize") ||
+    name_eq(export_name, "__wasm_apply_data_relocs") ||
+    name_eq(export_name, "__wasm_call_ctors")
+  ) {
+    wasmtime_context_t *context = wasmtime_store_context(self->store);
+    wasmtime_func_t initialization_func = export->of.func;
+    wasmtime_error_t *error = wasmtime_func_call(context, &initialization_func, NULL, 0, NULL, 0, trap);
+    assert(!error);
+    return true;
+  } else {
+    return false;
+  }
+}
+
+TSWasmStore *ts_wasm_store_new(TSWasmEngine *engine, TSWasmError *wasm_error) {
+  TSWasmStore *self = ts_calloc(1, sizeof(TSWasmStore));
+  wasmtime_store_t *store = wasmtime_store_new(engine, self, NULL);
+  wasmtime_context_t *context = wasmtime_store_context(store);
+  wasmtime_error_t *error = NULL;
+  wasm_trap_t *trap = NULL;
+  wasm_message_t message = WASM_EMPTY_VEC;
+  wasm_exporttype_vec_t export_types = WASM_EMPTY_VEC;
+  wasmtime_extern_t *imports = NULL;
+  wasmtime_module_t *stdlib_module = NULL;
+  wasm_memorytype_t *memory_type = NULL;
+  wasm_tabletype_t *table_type = NULL;
+
+  // Define functions called by scanners via function pointers on the lexer.
+  LexerInWasmMemory lexer = {
+    .lookahead = 0,
+    .result_symbol = 0,
+  };
+  FunctionDefinition lexer_definitions[] = {
+    {
+      (uint32_t *)&lexer.advance,
+      callback__lexer_advance,
+      wasm_functype_new_2_0(wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+    {
+      (uint32_t *)&lexer.mark_end,
+      callback__lexer_mark_end,
+      wasm_functype_new_1_0(wasm_valtype_new_i32())
+    },
+    {
+      (uint32_t *)&lexer.get_column,
+      callback__lexer_get_column,
+      wasm_functype_new_1_1(wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+    {
+      (uint32_t *)&lexer.is_at_included_range_start,
+      callback__lexer_is_at_included_range_start,
+      wasm_functype_new_1_1(wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+    {
+      (uint32_t *)&lexer.eof,
+      callback__lexer_eof,
+      wasm_functype_new_1_1(wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+  };
+
+  // Define builtin functions that can be imported by scanners.
+  BuiltinFunctionIndices builtin_fn_indices;
+  FunctionDefinition builtin_definitions[] = {
+    {
+      &builtin_fn_indices.proc_exit,
+      callback__abort,
+      wasm_functype_new_1_0(wasm_valtype_new_i32())
+    },
+    {
+      &builtin_fn_indices.abort,
+      callback__abort,
+      wasm_functype_new_0_0()
+    },
+    {
+      &builtin_fn_indices.assert_fail,
+      callback__abort,
+      wasm_functype_new_4_0(wasm_valtype_new_i32(), wasm_valtype_new_i32(), wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+    {
+      &builtin_fn_indices.notify_memory_growth,
+      callback__noop,
+      wasm_functype_new_1_0(wasm_valtype_new_i32())
+    },
+    {
+      &builtin_fn_indices.debug_message,
+      callback__debug_message,
+      wasm_functype_new_2_0(wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+    {
+      &builtin_fn_indices.at_exit,
+      callback__noop,
+      wasm_functype_new_3_1(wasm_valtype_new_i32(), wasm_valtype_new_i32(), wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+    {
+      &builtin_fn_indices.args_get,
+      callback__noop,
+      wasm_functype_new_2_1(wasm_valtype_new_i32(), wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+    {
+      &builtin_fn_indices.args_sizes_get,
+      callback__noop,
+      wasm_functype_new_2_1(wasm_valtype_new_i32(), wasm_valtype_new_i32(), wasm_valtype_new_i32())
+    },
+  };
+
+  // Create all of the wasm functions.
+  unsigned builtin_definitions_len = array_len(builtin_definitions);
+  unsigned lexer_definitions_len = array_len(lexer_definitions);
+  for (unsigned i = 0; i < builtin_definitions_len; i++) {
+    FunctionDefinition *definition = &builtin_definitions[i];
+    wasmtime_func_t func;
+    wasmtime_func_new_unchecked(context, definition->type, definition->callback, self, NULL, &func);
+    *definition->storage_location = func.index;
+    wasm_functype_delete(definition->type);
+  }
+  for (unsigned i = 0; i < lexer_definitions_len; i++) {
+    FunctionDefinition *definition = &lexer_definitions[i];
+    wasmtime_func_t func;
+    wasmtime_func_new_unchecked(context, definition->type, definition->callback, self, NULL, &func);
+    *definition->storage_location = func.index;
+    wasm_functype_delete(definition->type);
+  }
+
+  // Compile the stdlib module.
+  error = wasmtime_module_new(engine, STDLIB_WASM, STDLIB_WASM_LEN, &stdlib_module);
+  if (error) {
+    wasmtime_error_message(error, &message);
+    wasm_error->kind = TSWasmErrorKindCompile;
+    format(
+      &wasm_error->message,
+      "failed to compile wasm stdlib: %.*s",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+
+  // Retrieve the stdlib module's imports.
+  wasm_importtype_vec_t import_types = WASM_EMPTY_VEC;
+  wasmtime_module_imports(stdlib_module, &import_types);
+
+  // Find the initial number of memory pages needed by the stdlib.
+  const wasm_memorytype_t *stdlib_memory_type;
+  for (unsigned i = 0; i < import_types.size; i++) {
+    wasm_importtype_t *import_type = import_types.data[i];
+    const wasm_name_t *import_name = wasm_importtype_name(import_type);
+    if (name_eq(import_name, "memory")) {
+      const wasm_externtype_t *type = wasm_importtype_type(import_type);
+      stdlib_memory_type = wasm_externtype_as_memorytype_const(type);
+    }
+  }
+  if (!stdlib_memory_type) {
+    wasm_error->kind = TSWasmErrorKindCompile;
+    format(
+      &wasm_error->message,
+      "wasm stdlib is missing the 'memory' import"
+    );
+    goto error;
+  }
+
+  // Initialize store's memory
+  uint64_t initial_memory_pages = wasmtime_memorytype_minimum(stdlib_memory_type);
+  wasm_limits_t memory_limits = {.min = initial_memory_pages, .max = MAX_MEMORY_SIZE};
+  memory_type = wasm_memorytype_new(&memory_limits);
+  wasmtime_memory_t memory;
+  error = wasmtime_memory_new(context, memory_type, &memory);
+  if (error) {
+    wasmtime_error_message(error, &message);
+    wasm_error->kind = TSWasmErrorKindAllocate;
+    format(
+      &wasm_error->message,
+      "failed to allocate wasm memory: %.*s",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+  wasm_memorytype_delete(memory_type);
+  memory_type = NULL;
+
+  // Initialize store's function table
+  wasm_limits_t table_limits = {.min = 1, .max = wasm_limits_max_default};
+  table_type = wasm_tabletype_new(wasm_valtype_new(WASM_FUNCREF), &table_limits);
+  wasmtime_val_t initializer = {.kind = WASMTIME_FUNCREF};
+  wasmtime_table_t function_table;
+  error = wasmtime_table_new(context, table_type, &initializer, &function_table);
+  if (error) {
+    wasmtime_error_message(error, &message);
+    wasm_error->kind = TSWasmErrorKindAllocate;
+    format(
+      &wasm_error->message,
+      "failed to allocate wasm table: %.*s",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+  wasm_tabletype_delete(table_type);
+  table_type = NULL;
+
+  unsigned stdlib_symbols_len = array_len(STDLIB_SYMBOLS);
+
+  // Define globals for the stack and heap start addresses.
+  wasm_globaltype_t *const_i32_type = wasm_globaltype_new(wasm_valtype_new_i32(), WASM_CONST);
+  wasm_globaltype_t *var_i32_type = wasm_globaltype_new(wasm_valtype_new_i32(), WASM_VAR);
+
+  wasmtime_val_t stack_pointer_value = WASM_I32_VAL(0);
+  wasmtime_global_t stack_pointer_global;
+  error = wasmtime_global_new(context, var_i32_type, &stack_pointer_value, &stack_pointer_global);
+  assert(!error);
+
+  *self = (TSWasmStore) {
+    .engine = engine,
+    .store = store,
+    .memory = memory,
+    .function_table = function_table,
+    .language_instances = array_new(),
+    .stdlib_fn_indices = ts_calloc(stdlib_symbols_len, sizeof(uint32_t)),
+    .builtin_fn_indices = builtin_fn_indices,
+    .stack_pointer_global = stack_pointer_global,
+    .current_memory_offset = 0,
+    .current_function_table_offset = 0,
+    .const_i32_type = const_i32_type,
+  };
+
+  // Set up the imports for the stdlib module.
+  imports = ts_calloc(import_types.size, sizeof(wasmtime_extern_t));
+  for (unsigned i = 0; i < import_types.size; i++) {
+    wasm_importtype_t *type = import_types.data[i];
+    const wasm_name_t *import_name = wasm_importtype_name(type);
+    if (!ts_wasm_store__provide_builtin_import(self, import_name, &imports[i])) {
+      wasm_error->kind = TSWasmErrorKindInstantiate;
+      format(
+        &wasm_error->message,
+        "unexpected import in wasm stdlib: %.*s\n",
+        (int)import_name->size, import_name->data
+      );
+      goto error;
+    }
+  }
+
+  // Instantiate the stdlib module.
+  wasmtime_instance_t instance;
+  error = wasmtime_instance_new(context, stdlib_module, imports, import_types.size, &instance, &trap);
+  ts_free(imports);
+  imports = NULL;
+  if (error) {
+    wasmtime_error_message(error, &message);
+    wasm_error->kind = TSWasmErrorKindInstantiate;
+    format(
+      &wasm_error->message,
+      "failed to instantiate wasm stdlib module: %.*s",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+  if (trap) {
+    wasm_trap_message(trap, &message);
+    wasm_error->kind = TSWasmErrorKindInstantiate;
+    format(
+      &wasm_error->message,
+      "trapped when instantiating wasm stdlib module: %.*s",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+  wasm_importtype_vec_delete(&import_types);
+
+  // Process the stdlib module's exports.
+  for (unsigned i = 0; i < stdlib_symbols_len; i++) {
+    self->stdlib_fn_indices[i] = UINT32_MAX;
+  }
+  wasmtime_module_exports(stdlib_module, &export_types);
+  for (unsigned i = 0; i < export_types.size; i++) {
+    wasm_exporttype_t *export_type = export_types.data[i];
+    const wasm_name_t *name = wasm_exporttype_name(export_type);
+
+    char *export_name;
+    size_t name_len;
+    wasmtime_extern_t export = {.kind = WASM_EXTERN_GLOBAL};
+    bool exists = wasmtime_instance_export_nth(context, &instance, i, &export_name, &name_len, &export);
+    assert(exists);
+
+    if (export.kind == WASMTIME_EXTERN_GLOBAL) {
+      if (name_eq(name, "__stack_pointer")) {
+        self->stack_pointer_global = export.of.global;
+      }
+    }
+
+    if (export.kind == WASMTIME_EXTERN_FUNC) {
+      if (ts_wasm_store__call_module_initializer(self, name, &export, &trap)) {
+        if (trap) {
+          wasm_trap_message(trap, &message);
+          wasm_error->kind = TSWasmErrorKindInstantiate;
+          format(
+            &wasm_error->message,
+            "trap when calling stdlib relocation function: %.*s\n",
+            (int)message.size, message.data
+          );
+          goto error;
+        }
+        continue;
+      }
+
+      if (name_eq(name, "reset_heap")) {
+        self->builtin_fn_indices.reset_heap = export.of.func.index;
+        continue;
+      }
+
+      for (unsigned j = 0; j < stdlib_symbols_len; j++) {
+        if (name_eq(name, STDLIB_SYMBOLS[j])) {
+          self->stdlib_fn_indices[j] = export.of.func.index;
+          break;
+        }
+      }
+    }
+  }
+
+  if (self->builtin_fn_indices.reset_heap == UINT32_MAX) {
+    wasm_error->kind = TSWasmErrorKindInstantiate;
+    format(
+      &wasm_error->message,
+      "missing malloc reset function in wasm stdlib"
+    );
+    goto error;
+  }
+
+  for (unsigned i = 0; i < stdlib_symbols_len; i++) {
+    if (self->stdlib_fn_indices[i] == UINT32_MAX) {
+      wasm_error->kind = TSWasmErrorKindInstantiate;
+      format(
+        &wasm_error->message,
+        "missing exported symbol in wasm stdlib: %s",
+        STDLIB_SYMBOLS[i]
+      );
+      goto error;
+    }
+  }
+
+  wasm_exporttype_vec_delete(&export_types);
+  wasmtime_module_delete(stdlib_module);
+
+  // Add all of the lexer callback functions to the function table. Store their function table
+  // indices on the in-memory lexer.
+  uint32_t table_index;
+  error = wasmtime_table_grow(context, &function_table, lexer_definitions_len, &initializer, &table_index);
+  if (error) {
+    wasmtime_error_message(error, &message);
+    wasm_error->kind = TSWasmErrorKindAllocate;
+    format(
+      &wasm_error->message,
+      "failed to grow wasm table to initial size: %.*s",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+  for (unsigned i = 0; i < lexer_definitions_len; i++) {
+    FunctionDefinition *definition = &lexer_definitions[i];
+    wasmtime_func_t func = {function_table.store_id, *definition->storage_location};
+    wasmtime_val_t func_val = {.kind = WASMTIME_FUNCREF, .of.funcref = func};
+    error = wasmtime_table_set(context, &function_table, table_index, &func_val);
+    assert(!error);
+    *(int32_t *)(definition->storage_location) = table_index;
+    table_index++;
+  }
+
+  self->current_function_table_offset = table_index;
+  self->lexer_address = initial_memory_pages * MEMORY_PAGE_SIZE;
+  self->serialization_buffer_address = self->lexer_address + sizeof(LexerInWasmMemory);
+  self->current_memory_offset = self->serialization_buffer_address + TREE_SITTER_SERIALIZATION_BUFFER_SIZE;
+
+  // Grow the memory enough to hold the builtin lexer and serialization buffer.
+  uint32_t new_pages_needed = (self->current_memory_offset - self->lexer_address - 1) / MEMORY_PAGE_SIZE + 1;
+  uint64_t prev_memory_size;
+  wasmtime_memory_grow(context, &memory, new_pages_needed, &prev_memory_size);
+
+  uint8_t *memory_data = wasmtime_memory_data(context, &memory);
+  memcpy(&memory_data[self->lexer_address], &lexer, sizeof(lexer));
+  return self;
+
+error:
+  ts_free(self);
+  if (stdlib_module) wasmtime_module_delete(stdlib_module);
+  if (store) wasmtime_store_delete(store);
+  if (import_types.size) wasm_importtype_vec_delete(&import_types);
+  if (memory_type) wasm_memorytype_delete(memory_type);
+  if (table_type) wasm_tabletype_delete(table_type);
+  if (trap) wasm_trap_delete(trap);
+  if (error) wasmtime_error_delete(error);
+  if (message.size) wasm_byte_vec_delete(&message);
+  if (export_types.size) wasm_exporttype_vec_delete(&export_types);
+  if (imports) ts_free(imports);
+  return NULL;
+}
+
+void ts_wasm_store_delete(TSWasmStore *self) {
+  if (!self) return;
+  ts_free(self->stdlib_fn_indices);
+  wasm_globaltype_delete(self->const_i32_type);
+  wasmtime_store_delete(self->store);
+  wasm_engine_delete(self->engine);
+  for (unsigned i = 0; i < self->language_instances.size; i++) {
+    LanguageWasmInstance *instance = &self->language_instances.contents[i];
+    language_id_delete(instance->language_id);
+  }
+  array_delete(&self->language_instances);
+  ts_free(self);
+}
+
+size_t ts_wasm_store_language_count(const TSWasmStore *self) {
+  size_t result = 0;
+  for (unsigned i = 0; i < self->language_instances.size; i++) {
+    const WasmLanguageId *id = self->language_instances.contents[i].language_id;
+    if (!id->is_language_deleted) {
+      result++;
+    }
+  }
+  return result;
+}
+
+static bool ts_wasm_store__instantiate(
+  TSWasmStore *self,
+  wasmtime_module_t *module,
+  const char *language_name,
+  const WasmDylinkInfo *dylink_info,
+  wasmtime_instance_t *result,
+  int32_t *language_address,
+  char **error_message
+) {
+  wasmtime_error_t *error = NULL;
+  wasm_trap_t *trap = NULL;
+  wasm_message_t message = WASM_EMPTY_VEC;
+  char *language_function_name = NULL;
+  wasmtime_extern_t *imports = NULL;
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+
+  // Grow the function table to make room for the new functions.
+  wasmtime_val_t initializer = {.kind = WASMTIME_FUNCREF};
+  uint32_t prev_table_size;
+  error = wasmtime_table_grow(context, &self->function_table, dylink_info->table_size, &initializer, &prev_table_size);
+  if (error) {
+    format(error_message, "invalid function table size %u", dylink_info->table_size);
+    goto error;
+  }
+
+  // Grow the memory to make room for the new data.
+  uint32_t needed_memory_size = self->current_memory_offset + dylink_info->memory_size;
+  uint32_t current_memory_size = wasmtime_memory_data_size(context, &self->memory);
+  if (needed_memory_size > current_memory_size) {
+    uint32_t pages_to_grow = (
+      needed_memory_size - current_memory_size + MEMORY_PAGE_SIZE - 1) /
+      MEMORY_PAGE_SIZE;
+    uint64_t prev_memory_size;
+    error = wasmtime_memory_grow(context, &self->memory, pages_to_grow, &prev_memory_size);
+    if (error) {
+      format(error_message, "invalid memory size %u", dylink_info->memory_size);
+      goto error;
+    }
+  }
+
+  // Construct the language function name as string.
+  format(&language_function_name, "tree_sitter_%s", language_name);
+
+  const uint64_t store_id = self->function_table.store_id;
+
+  // Build the imports list for the module.
+  wasm_importtype_vec_t import_types = WASM_EMPTY_VEC;
+  wasmtime_module_imports(module, &import_types);
+  imports = ts_calloc(import_types.size, sizeof(wasmtime_extern_t));
+
+  for (unsigned i = 0; i < import_types.size; i++) {
+    const wasm_importtype_t *import_type = import_types.data[i];
+    const wasm_name_t *import_name = wasm_importtype_name(import_type);
+    if (import_name->size == 0) {
+      format(error_message, "empty import name");
+      goto error;
+    }
+
+    if (ts_wasm_store__provide_builtin_import(self, import_name, &imports[i])) {
+      continue;
+    }
+
+    bool defined_in_stdlib = false;
+    for (unsigned j = 0; j < array_len(STDLIB_SYMBOLS); j++) {
+      if (name_eq(import_name, STDLIB_SYMBOLS[j])) {
+        uint16_t address = self->stdlib_fn_indices[j];
+        imports[i] = (wasmtime_extern_t) {.kind = WASMTIME_EXTERN_FUNC, .of.func = {store_id, address}};
+        defined_in_stdlib = true;
+        break;
+      }
+    }
+
+    if (!defined_in_stdlib) {
+      format(
+        error_message,
+        "invalid import '%.*s'\n",
+        (int)import_name->size, import_name->data
+      );
+      goto error;
+    }
+  }
+
+  wasmtime_instance_t instance;
+  error = wasmtime_instance_new(context, module, imports, import_types.size, &instance, &trap);
+  wasm_importtype_vec_delete(&import_types);
+  ts_free(imports);
+  imports = NULL;
+  if (error) {
+    wasmtime_error_message(error, &message);
+    format(
+      error_message,
+      "error instantiating wasm module: %.*s\n",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+  if (trap) {
+    wasm_trap_message(trap, &message);
+    format(
+      error_message,
+      "trap when instantiating wasm module: %.*s\n",
+      (int)message.size, message.data
+    );
+    goto error;
+  }
+
+  self->current_memory_offset += dylink_info->memory_size;
+  self->current_function_table_offset += dylink_info->table_size;
+
+  // Process the module's exports.
+  bool found_language = false;
+  wasmtime_extern_t language_extern;
+  wasm_exporttype_vec_t export_types = WASM_EMPTY_VEC;
+  wasmtime_module_exports(module, &export_types);
+  for (unsigned i = 0; i < export_types.size; i++) {
+    wasm_exporttype_t *export_type = export_types.data[i];
+    const wasm_name_t *name = wasm_exporttype_name(export_type);
+
+    size_t name_len;
+    char *export_name;
+    wasmtime_extern_t export = {.kind = WASM_EXTERN_GLOBAL};
+    bool exists = wasmtime_instance_export_nth(context, &instance, i, &export_name, &name_len, &export);
+    assert(exists);
+
+    // If the module exports an initialization or data-relocation function, call it.
+    if (ts_wasm_store__call_module_initializer(self, name, &export, &trap)) {
+      if (trap) {
+        wasm_trap_message(trap, &message);
+        format(
+          error_message,
+          "trap when calling data relocation function: %.*s\n",
+          (int)message.size, message.data
+        );
+        goto error;
+      }
+    }
+
+    // Find the main language function for the module.
+    else if (name_eq(name, language_function_name)) {
+      language_extern = export;
+      found_language = true;
+    }
+  }
+  wasm_exporttype_vec_delete(&export_types);
+
+  if (!found_language) {
+    format(
+      error_message,
+      "module did not contain language function: %s",
+      language_function_name
+    );
+    goto error;
+  }
+
+  // Invoke the language function to get the static address of the language object.
+  wasmtime_func_t language_func = language_extern.of.func;
+  wasmtime_val_t language_address_val;
+  error = wasmtime_func_call(context, &language_func, NULL, 0, &language_address_val, 1, &trap);
+  assert(!error);
+  if (trap) {
+    wasm_trap_message(trap, &message);
+    format(
+      error_message,
+      "trapped when calling language function: %s: %.*s\n",
+      language_function_name, (int)message.size, message.data
+    );
+    goto error;
+  }
+
+  if (language_address_val.kind != WASMTIME_I32) {
+    format(
+      error_message,
+      "language function did not return an integer: %s\n",
+      language_function_name
+    );
+    goto error;
+  }
+
+  ts_free(language_function_name);
+  *result = instance;
+  *language_address = language_address_val.of.i32;
+  return true;
+
+error:
+  if (language_function_name) ts_free(language_function_name);
+  if (message.size) wasm_byte_vec_delete(&message);
+  if (error) wasmtime_error_delete(error);
+  if (trap) wasm_trap_delete(trap);
+  if (imports) ts_free(imports);
+  return false;
+}
+
+static bool ts_wasm_store__sentinel_lex_fn(TSLexer *_lexer, TSStateId state) {
+  return false;
+}
+
+const TSLanguage *ts_wasm_store_load_language(
+  TSWasmStore *self,
+  const char *language_name,
+  const char *wasm,
+  uint32_t wasm_len,
+  TSWasmError *wasm_error
+) {
+  WasmDylinkInfo dylink_info;
+  wasmtime_module_t *module = NULL;
+  wasmtime_error_t *error = NULL;
+  wasm_error->kind = TSWasmErrorKindNone;
+
+  if (!wasm_dylink_info__parse((const unsigned char *)wasm, wasm_len, &dylink_info)) {
+    wasm_error->kind = TSWasmErrorKindParse;
+    format(&wasm_error->message, "failed to parse dylink section of wasm module");
+    goto error;
+  }
+
+  // Compile the wasm code.
+  error = wasmtime_module_new(self->engine, (const uint8_t *)wasm, wasm_len, &module);
+  if (error) {
+    wasm_message_t message;
+    wasmtime_error_message(error, &message);
+    wasm_error->kind = TSWasmErrorKindCompile;
+    format(&wasm_error->message, "error compiling wasm module: %.*s", (int)message.size, message.data);
+    wasm_byte_vec_delete(&message);
+    goto error;
+  }
+
+  // Instantiate the module in this store.
+  wasmtime_instance_t instance;
+  int32_t language_address;
+  if (!ts_wasm_store__instantiate(
+    self,
+    module,
+    language_name,
+    &dylink_info,
+    &instance,
+    &language_address,
+    &wasm_error->message
+  )) {
+    wasm_error->kind = TSWasmErrorKindInstantiate;
+    goto error;
+  }
+
+  // Copy all of the static data out of the language object in wasm memory,
+  // constructing a native language object.
+  LanguageInWasmMemory wasm_language;
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  const uint8_t *memory = wasmtime_memory_data(context, &self->memory);
+  memcpy(&wasm_language, &memory[language_address], sizeof(LanguageInWasmMemory));
+
+  if (wasm_language.version < LANGUAGE_VERSION_USABLE_VIA_WASM) {
+      wasm_error->kind = TSWasmErrorKindInstantiate;
+      format(&wasm_error->message, "language version %u is too old for wasm", wasm_language.version);
+      goto error;
+  }
+
+  int32_t addresses[] = {
+    wasm_language.alias_map,
+    wasm_language.alias_sequences,
+    wasm_language.field_map_entries,
+    wasm_language.field_map_slices,
+    wasm_language.field_names,
+    wasm_language.keyword_lex_fn,
+    wasm_language.lex_fn,
+    wasm_language.lex_modes,
+    wasm_language.parse_actions,
+    wasm_language.parse_table,
+    wasm_language.primary_state_ids,
+    wasm_language.primary_state_ids,
+    wasm_language.public_symbol_map,
+    wasm_language.small_parse_table,
+    wasm_language.small_parse_table_map,
+    wasm_language.symbol_metadata,
+    wasm_language.symbol_metadata,
+    wasm_language.symbol_names,
+    wasm_language.external_token_count > 0 ? wasm_language.external_scanner.states : 0,
+    wasm_language.external_token_count > 0 ? wasm_language.external_scanner.symbol_map : 0,
+    wasm_language.external_token_count > 0 ? wasm_language.external_scanner.create : 0,
+    wasm_language.external_token_count > 0 ? wasm_language.external_scanner.destroy : 0,
+    wasm_language.external_token_count > 0 ? wasm_language.external_scanner.scan : 0,
+    wasm_language.external_token_count > 0 ? wasm_language.external_scanner.serialize : 0,
+    wasm_language.external_token_count > 0 ? wasm_language.external_scanner.deserialize : 0,
+    language_address,
+    self->current_memory_offset,
+  };
+  uint32_t address_count = array_len(addresses);
+
+  TSLanguage *language = ts_calloc(1, sizeof(TSLanguage));
+  StringData symbol_name_buffer = array_new();
+  StringData field_name_buffer = array_new();
+
+  *language = (TSLanguage) {
+    .version = wasm_language.version,
+    .symbol_count = wasm_language.symbol_count,
+    .alias_count = wasm_language.alias_count,
+    .token_count = wasm_language.token_count,
+    .external_token_count = wasm_language.external_token_count,
+    .state_count = wasm_language.state_count,
+    .large_state_count = wasm_language.large_state_count,
+    .production_id_count = wasm_language.production_id_count,
+    .field_count = wasm_language.field_count,
+    .max_alias_sequence_length = wasm_language.max_alias_sequence_length,
+    .keyword_capture_token = wasm_language.keyword_capture_token,
+    .parse_table = copy(
+      &memory[wasm_language.parse_table],
+      wasm_language.large_state_count * wasm_language.symbol_count * sizeof(uint16_t)
+    ),
+    .parse_actions = copy_unsized_static_array(
+      memory,
+      wasm_language.parse_actions,
+      addresses,
+      address_count
+    ),
+    .symbol_names = copy_strings(
+      memory,
+      wasm_language.symbol_names,
+      wasm_language.symbol_count + wasm_language.alias_count,
+      &symbol_name_buffer
+    ),
+    .symbol_metadata = copy(
+      &memory[wasm_language.symbol_metadata],
+      (wasm_language.symbol_count + wasm_language.alias_count) * sizeof(TSSymbolMetadata)
+    ),
+    .public_symbol_map = copy(
+      &memory[wasm_language.public_symbol_map],
+      (wasm_language.symbol_count + wasm_language.alias_count) * sizeof(TSSymbol)
+    ),
+    .lex_modes = copy(
+      &memory[wasm_language.lex_modes],
+      wasm_language.state_count * sizeof(TSLexMode)
+    ),
+  };
+
+  if (language->field_count > 0 && language->production_id_count > 0) {
+    language->field_map_slices = copy(
+      &memory[wasm_language.field_map_slices],
+      wasm_language.production_id_count * sizeof(TSFieldMapSlice)
+    );
+    const TSFieldMapSlice last_field_map_slice = language->field_map_slices[language->production_id_count - 1];
+    language->field_map_entries = copy(
+      &memory[wasm_language.field_map_entries],
+      (last_field_map_slice.index + last_field_map_slice.length) * sizeof(TSFieldMapEntry)
+    );
+    language->field_names = copy_strings(
+      memory,
+      wasm_language.field_names,
+      wasm_language.field_count + 1,
+      &field_name_buffer
+    );
+  }
+
+  if (language->max_alias_sequence_length > 0 && language->production_id_count > 0) {
+    // The alias map contains symbols, alias counts, and aliases, terminated by a null symbol.
+    int32_t alias_map_size = 0;
+    for (;;) {
+      TSSymbol symbol;
+      memcpy(&symbol, &memory[wasm_language.alias_map + alias_map_size], sizeof(symbol));
+      alias_map_size += sizeof(TSSymbol);
+      if (symbol == 0) break;
+      uint16_t value_count;
+      memcpy(&value_count, &memory[wasm_language.alias_map + alias_map_size], sizeof(value_count));
+      alias_map_size += value_count * sizeof(TSSymbol);
+    }
+    language->alias_map = copy(
+      &memory[wasm_language.alias_map],
+      alias_map_size * sizeof(TSSymbol)
+    );
+    language->alias_sequences = copy(
+      &memory[wasm_language.alias_sequences],
+      wasm_language.production_id_count * wasm_language.max_alias_sequence_length * sizeof(TSSymbol)
+    );
+  }
+
+  if (language->state_count > language->large_state_count) {
+    uint32_t small_state_count = wasm_language.state_count - wasm_language.large_state_count;
+    language->small_parse_table_map = copy(
+      &memory[wasm_language.small_parse_table_map],
+      small_state_count * sizeof(uint32_t)
+    );
+    language->small_parse_table = copy_unsized_static_array(
+      memory,
+      wasm_language.small_parse_table,
+      addresses,
+      address_count
+    );
+  }
+
+  if (language->version >= LANGUAGE_VERSION_WITH_PRIMARY_STATES) {
+    language->primary_state_ids = copy(
+      &memory[wasm_language.primary_state_ids],
+      wasm_language.state_count * sizeof(TSStateId)
+    );
+  }
+
+  if (language->external_token_count > 0) {
+    language->external_scanner.symbol_map = copy(
+      &memory[wasm_language.external_scanner.symbol_map],
+      wasm_language.external_token_count * sizeof(TSSymbol)
+    );
+    language->external_scanner.states = (void *)(uintptr_t)wasm_language.external_scanner.states;
+  }
+
+  unsigned name_len = strlen(language_name);
+  char *name = ts_malloc(name_len + 1);
+  memcpy(name, language_name, name_len);
+  name[name_len] = '\0';
+
+  LanguageWasmModule *language_module = ts_malloc(sizeof(LanguageWasmModule));
+  *language_module = (LanguageWasmModule) {
+    .language_id = language_id_new(),
+    .module = module,
+    .name = name,
+    .symbol_name_buffer = symbol_name_buffer.contents,
+    .field_name_buffer = field_name_buffer.contents,
+    .dylink_info = dylink_info,
+    .ref_count = 1,
+  };
+
+  // The lex functions are not used for wasm languages. Use those two fields
+  // to mark this language as WASM-based and to store the language's
+  // WASM-specific data.
+  language->lex_fn = ts_wasm_store__sentinel_lex_fn;
+  language->keyword_lex_fn = (void *)language_module;
+
+  // Clear out any instances of languages that have been deleted.
+  for (unsigned i = 0; i < self->language_instances.size; i++) {
+    WasmLanguageId *id = self->language_instances.contents[i].language_id;
+    if (id->is_language_deleted) {
+      language_id_delete(id);
+      array_erase(&self->language_instances, i);
+      i--;
+    }
+  }
+
+  // Store this store's instance of this language module.
+  array_push(&self->language_instances, ((LanguageWasmInstance) {
+    .language_id = language_id_clone(language_module->language_id),
+    .instance = instance,
+    .external_states_address = wasm_language.external_scanner.states,
+    .lex_main_fn_index = wasm_language.lex_fn,
+    .lex_keyword_fn_index = wasm_language.keyword_lex_fn,
+    .scanner_create_fn_index = wasm_language.external_scanner.create,
+    .scanner_destroy_fn_index = wasm_language.external_scanner.destroy,
+    .scanner_serialize_fn_index = wasm_language.external_scanner.serialize,
+    .scanner_deserialize_fn_index = wasm_language.external_scanner.deserialize,
+    .scanner_scan_fn_index = wasm_language.external_scanner.scan,
+  }));
+
+  return language;
+
+error:
+  if (module) wasmtime_module_delete(module);
+  return NULL;
+}
+
+bool ts_wasm_store_add_language(
+  TSWasmStore *self,
+  const TSLanguage *language,
+  uint32_t *index
+) {
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  const LanguageWasmModule *language_module = (void *)language->keyword_lex_fn;
+
+  // Search for this store's instance of the language module. Also clear out any
+  // instances of languages that have been deleted.
+  bool exists = false;
+  for (unsigned i = 0; i < self->language_instances.size; i++) {
+    WasmLanguageId *id = self->language_instances.contents[i].language_id;
+    if (id->is_language_deleted) {
+      language_id_delete(id);
+      array_erase(&self->language_instances, i);
+      i--;
+    } else if (id == language_module->language_id) {
+      exists = true;
+      *index = i;
+    }
+  }
+
+  // If the language module has not been instantiated in this store, then add
+  // it to this store.
+  if (!exists) {
+    *index = self->language_instances.size;
+    char *message;
+    wasmtime_instance_t instance;
+    int32_t language_address;
+    if (!ts_wasm_store__instantiate(
+      self,
+      language_module->module,
+      language_module->name,
+      &language_module->dylink_info,
+      &instance,
+      &language_address,
+      &message
+    )) {
+      ts_free(message);
+      return false;
+    }
+
+    LanguageInWasmMemory wasm_language;
+    const uint8_t *memory = wasmtime_memory_data(context, &self->memory);
+    memcpy(&wasm_language, &memory[language_address], sizeof(LanguageInWasmMemory));
+    array_push(&self->language_instances, ((LanguageWasmInstance) {
+      .language_id = language_id_clone(language_module->language_id),
+      .instance = instance,
+      .external_states_address = wasm_language.external_scanner.states,
+      .lex_main_fn_index = wasm_language.lex_fn,
+      .lex_keyword_fn_index = wasm_language.keyword_lex_fn,
+      .scanner_create_fn_index = wasm_language.external_scanner.create,
+      .scanner_destroy_fn_index = wasm_language.external_scanner.destroy,
+      .scanner_serialize_fn_index = wasm_language.external_scanner.serialize,
+      .scanner_deserialize_fn_index = wasm_language.external_scanner.deserialize,
+      .scanner_scan_fn_index = wasm_language.external_scanner.scan,
+    }));
+  }
+
+  return true;
+}
+
+void ts_wasm_store_reset_heap(TSWasmStore *self) {
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  wasmtime_func_t func = {
+    self->function_table.store_id,
+    self->builtin_fn_indices.reset_heap
+  };
+  wasm_trap_t *trap = NULL;
+  wasmtime_val_t args[1] = {
+    {.of.i32 = self->current_memory_offset, .kind = WASMTIME_I32},
+  };
+
+  wasmtime_error_t *error = wasmtime_func_call(context, &func, args, 1, NULL, 0, &trap);
+  assert(!error);
+  assert(!trap);
+}
+
+bool ts_wasm_store_start(TSWasmStore *self, TSLexer *lexer, const TSLanguage *language) {
+  uint32_t instance_index;
+  if (!ts_wasm_store_add_language(self, language, &instance_index)) return false;
+  self->current_lexer = lexer;
+  self->current_instance = &self->language_instances.contents[instance_index];
+  self->has_error = false;
+  ts_wasm_store_reset_heap(self);
+  return true;
+}
+
+void ts_wasm_store_reset(TSWasmStore *self) {
+  self->current_lexer = NULL;
+  self->current_instance = NULL;
+  self->has_error = false;
+  ts_wasm_store_reset_heap(self);
+}
+
+static void ts_wasm_store__call(
+  TSWasmStore *self,
+  int32_t function_index,
+  wasmtime_val_raw_t *args_and_results,
+  size_t args_and_results_len
+) {
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  wasmtime_val_t value;
+  bool succeeded = wasmtime_table_get(context, &self->function_table, function_index, &value);
+  assert(succeeded);
+  assert(value.kind == WASMTIME_FUNCREF);
+  wasmtime_func_t func = value.of.funcref;
+
+  wasm_trap_t *trap = NULL;
+  wasmtime_error_t *error = wasmtime_func_call_unchecked(context, &func, args_and_results, args_and_results_len, &trap);
+  if (error) {
+    // wasm_message_t message;
+    // wasmtime_error_message(error, &message);
+    // fprintf(
+    //   stderr,
+    //   "error in wasm module: %.*s\n",
+    //   (int)message.size, message.data
+    // );
+    wasmtime_error_delete(error);
+    self->has_error = true;
+  } else if (trap) {
+    // wasm_message_t message;
+    // wasm_trap_message(trap, &message);
+    // fprintf(
+    //   stderr,
+    //   "trap in wasm module: %.*s\n",
+    //   (int)message.size, message.data
+    // );
+    wasm_trap_delete(trap);
+    self->has_error = true;
+  }
+}
+
+static bool ts_wasm_store__call_lex_function(TSWasmStore *self, unsigned function_index, TSStateId state) {
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  uint8_t *memory_data = wasmtime_memory_data(context, &self->memory);
+  memcpy(
+    &memory_data[self->lexer_address],
+    &self->current_lexer->lookahead,
+    sizeof(self->current_lexer->lookahead)
+  );
+
+  wasmtime_val_raw_t args[2] = {
+    {.i32 = self->lexer_address},
+    {.i32 = state},
+  };
+  ts_wasm_store__call(self, function_index, args, 2);
+  if (self->has_error) return false;
+  bool result = args[0].i32;
+
+  memcpy(
+    &self->current_lexer->lookahead,
+    &memory_data[self->lexer_address],
+    sizeof(self->current_lexer->lookahead) + sizeof(self->current_lexer->result_symbol)
+  );
+  return result;
+}
+
+bool ts_wasm_store_call_lex_main(TSWasmStore *self, TSStateId state) {
+  return ts_wasm_store__call_lex_function(
+    self,
+    self->current_instance->lex_main_fn_index,
+    state
+  );
+}
+
+bool ts_wasm_store_call_lex_keyword(TSWasmStore *self, TSStateId state) {
+  return ts_wasm_store__call_lex_function(
+    self,
+    self->current_instance->lex_keyword_fn_index,
+    state
+  );
+}
+
+uint32_t ts_wasm_store_call_scanner_create(TSWasmStore *self) {
+  wasmtime_val_raw_t args[1] = {{.i32 = 0}};
+  ts_wasm_store__call(self, self->current_instance->scanner_create_fn_index, args, 1);
+  if (self->has_error) return 0;
+  return args[0].i32;
+}
+
+void ts_wasm_store_call_scanner_destroy(TSWasmStore *self, uint32_t scanner_address) {
+  if (self->current_instance) {
+    wasmtime_val_raw_t args[1] = {{.i32 = scanner_address}};
+    ts_wasm_store__call(self, self->current_instance->scanner_destroy_fn_index, args, 1);
+  }
+}
+
+bool ts_wasm_store_call_scanner_scan(
+  TSWasmStore *self,
+  uint32_t scanner_address,
+  uint32_t valid_tokens_ix
+) {
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  uint8_t *memory_data = wasmtime_memory_data(context, &self->memory);
+
+  memcpy(
+    &memory_data[self->lexer_address],
+    &self->current_lexer->lookahead,
+    sizeof(self->current_lexer->lookahead)
+  );
+
+  uint32_t valid_tokens_address =
+    self->current_instance->external_states_address +
+    (valid_tokens_ix * sizeof(bool));
+  wasmtime_val_raw_t args[3] = {
+    {.i32 = scanner_address},
+    {.i32 = self->lexer_address},
+    {.i32 = valid_tokens_address}
+  };
+  ts_wasm_store__call(self, self->current_instance->scanner_scan_fn_index, args, 3);
+  if (self->has_error) return false;
+
+  memcpy(
+    &self->current_lexer->lookahead,
+    &memory_data[self->lexer_address],
+    sizeof(self->current_lexer->lookahead) + sizeof(self->current_lexer->result_symbol)
+  );
+  return args[0].i32;
+}
+
+uint32_t ts_wasm_store_call_scanner_serialize(
+  TSWasmStore *self,
+  uint32_t scanner_address,
+  char *buffer
+) {
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  uint8_t *memory_data = wasmtime_memory_data(context, &self->memory);
+
+  wasmtime_val_raw_t args[2] = {
+    {.i32 = scanner_address},
+    {.i32 = self->serialization_buffer_address},
+  };
+  ts_wasm_store__call(self, self->current_instance->scanner_serialize_fn_index, args, 2);
+  if (self->has_error) return 0;
+
+  uint32_t length = args[0].i32;
+
+  if (length > 0) {
+    memcpy(
+      ((Lexer *)self->current_lexer)->debug_buffer,
+      &memory_data[self->serialization_buffer_address],
+      length
+    );
+  }
+  return length;
+}
+
+void ts_wasm_store_call_scanner_deserialize(
+  TSWasmStore *self,
+  uint32_t scanner_address,
+  const char *buffer,
+  unsigned length
+) {
+  wasmtime_context_t *context = wasmtime_store_context(self->store);
+  uint8_t *memory_data = wasmtime_memory_data(context, &self->memory);
+
+  if (length > 0) {
+    memcpy(
+      &memory_data[self->serialization_buffer_address],
+      buffer,
+      length
+    );
+  }
+
+  wasmtime_val_raw_t args[3] = {
+    {.i32 = scanner_address},
+    {.i32 = self->serialization_buffer_address},
+    {.i32 = length},
+  };
+  ts_wasm_store__call(self, self->current_instance->scanner_deserialize_fn_index, args, 3);
+}
+
+bool ts_wasm_store_has_error(const TSWasmStore *self) {
+  return self->has_error;
+}
+
+bool ts_language_is_wasm(const TSLanguage *self) {
+  return self->lex_fn == ts_wasm_store__sentinel_lex_fn;
+}
+
+static inline LanguageWasmModule *ts_language__wasm_module(const TSLanguage *self) {
+  return (LanguageWasmModule *)self->keyword_lex_fn;
+}
+
+void ts_wasm_language_retain(const TSLanguage *self) {
+  LanguageWasmModule *module = ts_language__wasm_module(self);
+  assert(module->ref_count > 0);
+  atomic_inc(&module->ref_count);
+}
+
+void ts_wasm_language_release(const TSLanguage *self) {
+  LanguageWasmModule *module = ts_language__wasm_module(self);
+  assert(module->ref_count > 0);
+  if (atomic_dec(&module->ref_count) == 0) {
+    // Update the language id to reflect that the language is deleted. This allows any wasm stores
+    // that hold wasm instances for this language to delete those instances.
+    atomic_inc(&module->language_id->is_language_deleted);
+    language_id_delete(module->language_id);
+
+    ts_free((void *)module->field_name_buffer);
+    ts_free((void *)module->symbol_name_buffer);
+    ts_free((void *)module->name);
+    wasmtime_module_delete(module->module);
+    ts_free(module);
+
+    ts_free((void *)self->alias_map);
+    ts_free((void *)self->alias_sequences);
+    ts_free((void *)self->external_scanner.symbol_map);
+    ts_free((void *)self->field_map_entries);
+    ts_free((void *)self->field_map_slices);
+    ts_free((void *)self->field_names);
+    ts_free((void *)self->lex_modes);
+    ts_free((void *)self->parse_actions);
+    ts_free((void *)self->parse_table);
+    ts_free((void *)self->primary_state_ids);
+    ts_free((void *)self->public_symbol_map);
+    ts_free((void *)self->small_parse_table);
+    ts_free((void *)self->small_parse_table_map);
+    ts_free((void *)self->symbol_metadata);
+    ts_free((void *)self->symbol_names);
+    ts_free((void *)self);
+  }
+}
+
+#else
+
+// If the WASM feature is not enabled, define dummy versions of all of the
+// wasm-related functions.
+
+void ts_wasm_store_delete(TSWasmStore *self) {
+  (void)self;
+}
+
+bool ts_wasm_store_start(
+  TSWasmStore *self,
+  TSLexer *lexer,
+  const TSLanguage *language
+) {
+  (void)self;
+  (void)lexer;
+  (void)language;
+  return false;
+}
+
+void ts_wasm_store_reset(TSWasmStore *self) {
+  (void)self;
+}
+
+bool ts_wasm_store_call_lex_main(TSWasmStore *self, TSStateId state) {
+  (void)self;
+  (void)state;
+  return false;
+}
+
+bool ts_wasm_store_call_lex_keyword(TSWasmStore *self, TSStateId state) {
+  (void)self;
+  (void)state;
+  return false;
+}
+
+uint32_t ts_wasm_store_call_scanner_create(TSWasmStore *self) {
+  (void)self;
+  return 0;
+}
+
+void ts_wasm_store_call_scanner_destroy(
+  TSWasmStore *self,
+  uint32_t scanner_address
+) {
+  (void)self;
+  (void)scanner_address;
+}
+
+bool ts_wasm_store_call_scanner_scan(
+  TSWasmStore *self,
+  uint32_t scanner_address,
+  uint32_t valid_tokens_ix
+) {
+  (void)self;
+  (void)scanner_address;
+  (void)valid_tokens_ix;
+  return false;
+}
+
+uint32_t ts_wasm_store_call_scanner_serialize(
+  TSWasmStore *self,
+  uint32_t scanner_address,
+  char *buffer
+) {
+  (void)self;
+  (void)scanner_address;
+  (void)buffer;
+  return 0;
+}
+
+void ts_wasm_store_call_scanner_deserialize(
+  TSWasmStore *self,
+  uint32_t scanner_address,
+  const char *buffer,
+  unsigned length
+) {
+  (void)self;
+  (void)scanner_address;
+  (void)buffer;
+  (void)length;
+}
+
+bool ts_wasm_store_has_error(const TSWasmStore *self) {
+  (void)self;
+  return false;
+}
+
+bool ts_language_is_wasm(const TSLanguage *self) {
+  (void)self;
+  return false;
+}
+
+void ts_wasm_language_retain(const TSLanguage *self) {
+  (void)self;
+}
+
+void ts_wasm_language_release(const TSLanguage *self) {
+  (void)self;
+}
+
+#endif