[wasm] Move all heap-allocated WASM structures into wasm-objects.h.

src/wasm/wasm-objects.cc

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/wasm/wasm-objects.h"
+#include "src/wasm/wasm-module.h"
+
+#define TRACE(...)                                      \
+  do {                                                  \
+    if (FLAG_trace_wasm_instances) PrintF(__VA_ARGS__); \
+  } while (false)
+
+#define TRACE_CHAIN(instance)        \
+  do {                               \
+    instance->PrintInstancesChain(); \
+  } while (false)
+
+using namespace v8::internal;
+using namespace v8::internal::wasm;
+
+#define DEFINE_ACCESSORS(Container, name, field, type) \
+  type* Container::get_##name() {                      \
+    return type::cast(GetInternalField(field));        \
+  }                                                    \
+  void Container::set_##name(type* value) {            \
+    return SetInternalField(field, value);             \
+  }
+
+#define DEFINE_OPTIONAL_ACCESSORS(Container, name, field, type) \
+  bool Container::has_##name() {                                \
+    return !GetInternalField(field)->IsUndefined(GetIsolate()); \
+  }                                                             \
+  type* Container::get_##name() {                               \
+    return type::cast(GetInternalField(field));                 \
+  }                                                             \
+  void Container::set_##name(type* value) {                     \
+    return SetInternalField(field, value);                      \
+  }
+
+#define DEFINE_GETTER(Container, name, field, type) \
+  type* Container::get_##name() { return type::cast(GetInternalField(field)); }
+
+static uint32_t SafeUint32(Object* value) {
+  if (value->IsSmi()) {
+    int32_t val = Smi::cast(value)->value();
+    CHECK_GE(val, 0);
+    return static_cast<uint32_t>(val);
+  }
+  DCHECK(value->IsHeapNumber());
+  HeapNumber* num = HeapNumber::cast(value);
+  CHECK_GE(num->value(), 0.0);
+  CHECK_LE(num->value(), static_cast<double>(kMaxUInt32));
+  return static_cast<uint32_t>(num->value());
+}
+
+static int32_t SafeInt32(Object* value) {
+  if (value->IsSmi()) {
+    return Smi::cast(value)->value();
+  }
+  DCHECK(value->IsHeapNumber());
+  HeapNumber* num = HeapNumber::cast(value);
+  CHECK_GE(num->value(), static_cast<double>(Smi::kMinValue));
+  CHECK_LE(num->value(), static_cast<double>(Smi::kMaxValue));
+  return static_cast<int32_t>(num->value());
+}
+
+Handle<WasmModuleObject> WasmModuleObject::New(
+    Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
+  ModuleOrigin origin = compiled_module->module()->origin;
+
+  Handle<JSObject> module_object;
+  if (origin == ModuleOrigin::kWasmOrigin) {
+    Handle<JSFunction> module_cons(
+        isolate->native_context()->wasm_module_constructor());
+    module_object = isolate->factory()->NewJSObject(module_cons);
+    Handle<Symbol> module_sym(isolate->native_context()->wasm_module_sym());
+    Object::SetProperty(module_object, module_sym, module_object, STRICT)
+        .Check();
+  } else {
+    DCHECK(origin == ModuleOrigin::kAsmJsOrigin);
+    Handle<Map> map = isolate->factory()->NewMap(
+        JS_OBJECT_TYPE,
+        JSObject::kHeaderSize + WasmModuleObject::kFieldCount * kPointerSize);
+    module_object = isolate->factory()->NewJSObjectFromMap(map, TENURED);
+  }
+  module_object->SetInternalField(WasmModuleObject::kCompiledModule,
+                                  *compiled_module);
+  Handle<WeakCell> link_to_module =
+      isolate->factory()->NewWeakCell(module_object);
+  compiled_module->set_weak_wasm_module(link_to_module);
+  return Handle<WasmModuleObject>::cast(module_object);
+}
+
+WasmModuleObject* WasmModuleObject::cast(Object* object) {
+  DCHECK(object->IsJSObject());
+  // TODO(titzer): brand check for WasmModuleObject.
+  return reinterpret_cast<WasmModuleObject*>(object);
+}
+
+Handle<WasmTableObject> WasmTableObject::New(Isolate* isolate, uint32_t initial,
+                                             uint32_t maximum,
+                                             Handle<FixedArray>* js_functions) {
+  Handle<JSFunction> table_ctor(
+      isolate->native_context()->wasm_table_constructor());
+  Handle<JSObject> table_obj = isolate->factory()->NewJSObject(table_ctor);
+  *js_functions = isolate->factory()->NewFixedArray(initial);
+  Object* null = isolate->heap()->null_value();
+  for (int i = 0; i < static_cast<int>(initial); ++i) {
+    (*js_functions)->set(i, null);
+  }
+  table_obj->SetInternalField(kFunctions, *(*js_functions));
+  table_obj->SetInternalField(kMaximum,
+                              static_cast<Object*>(Smi::FromInt(maximum)));
+
+  Handle<FixedArray> dispatch_tables = isolate->factory()->NewFixedArray(0);
+  table_obj->SetInternalField(kDispatchTables, *dispatch_tables);
+  Handle<Symbol> table_sym(isolate->native_context()->wasm_table_sym());
+  Object::SetProperty(table_obj, table_sym, table_obj, STRICT).Check();
+  return Handle<WasmTableObject>::cast(table_obj);
+}
+
+DEFINE_GETTER(WasmTableObject, dispatch_tables, kDispatchTables, FixedArray)
+
+Handle<FixedArray> WasmTableObject::AddDispatchTable(
+    Isolate* isolate, Handle<WasmTableObject> table_obj,
+    Handle<WasmInstanceObject> instance, int table_index,
+    Handle<FixedArray> dispatch_table) {
+  Handle<FixedArray> dispatch_tables(
+      FixedArray::cast(table_obj->GetInternalField(kDispatchTables)), isolate);
+  DCHECK_EQ(0, dispatch_tables->length() % 3);
+
+  if (instance.is_null()) return dispatch_tables;
+  // TODO(titzer): use weak cells here to avoid leaking instances.
+
+  // Grow the dispatch table and add a new triple at the end.
+  Handle<FixedArray> new_dispatch_tables =
+      isolate->factory()->CopyFixedArrayAndGrow(dispatch_tables, 3);
+
+  new_dispatch_tables->set(dispatch_tables->length() + 0, *instance);
+  new_dispatch_tables->set(dispatch_tables->length() + 1,
+                           Smi::FromInt(table_index));
+  new_dispatch_tables->set(dispatch_tables->length() + 2, *dispatch_table);
+
+  table_obj->SetInternalField(WasmTableObject::kDispatchTables,
+                              *new_dispatch_tables);
+
+  return new_dispatch_tables;
+}
+
+DEFINE_ACCESSORS(WasmTableObject, functions, kFunctions, FixedArray)
+
+uint32_t WasmTableObject::current_length() { return get_functions()->length(); }
+
+uint32_t WasmTableObject::maximum_length() {
+  return SafeUint32(GetInternalField(kMaximum));
+}
+
+WasmTableObject* WasmTableObject::cast(Object* object) {
+  DCHECK(object && object->IsJSObject());
+  // TODO(titzer): brand check for WasmTableObject.
+  return reinterpret_cast<WasmTableObject*>(object);
+}
+
+Handle<WasmMemoryObject> WasmMemoryObject::New(Isolate* isolate,
+                                               Handle<JSArrayBuffer> buffer,
+                                               int maximum) {
+  Handle<JSFunction> memory_ctor(
+      isolate->native_context()->wasm_memory_constructor());
+  Handle<JSObject> memory_obj = isolate->factory()->NewJSObject(memory_ctor);
+  memory_obj->SetInternalField(kArrayBuffer, *buffer);
+  memory_obj->SetInternalField(kMaximum,
+                               static_cast<Object*>(Smi::FromInt(maximum)));
+  Handle<Symbol> memory_sym(isolate->native_context()->wasm_memory_sym());
+  Object::SetProperty(memory_obj, memory_sym, memory_obj, STRICT).Check();
+  return Handle<WasmMemoryObject>::cast(memory_obj);
+}
+
+DEFINE_ACCESSORS(WasmMemoryObject, buffer, kArrayBuffer, JSArrayBuffer)
+
+uint32_t WasmMemoryObject::current_pages() {
+  return SafeUint32(get_buffer()->byte_length()) / wasm::WasmModule::kPageSize;
+}
+
+int32_t WasmMemoryObject::maximum_pages() {
+  return SafeInt32(GetInternalField(kMaximum));
+}
+
+WasmMemoryObject* WasmMemoryObject::cast(Object* object) {
+  DCHECK(object && object->IsJSObject());
+  // TODO(titzer): brand check for WasmMemoryObject.
+  return reinterpret_cast<WasmMemoryObject*>(object);
+}
+
+void WasmMemoryObject::AddInstance(WasmInstanceObject* instance) {
+  // TODO(gdeepti): This should be a weak list of instance objects
+  // for instances that share memory.
+  SetInternalField(kInstance, instance);
+}
+
+DEFINE_ACCESSORS(WasmInstanceObject, compiled_module, kCompiledModule,
+                 WasmCompiledModule)
+DEFINE_OPTIONAL_ACCESSORS(WasmInstanceObject, globals_buffer,
+                          kGlobalsArrayBuffer, JSArrayBuffer)
+DEFINE_OPTIONAL_ACCESSORS(WasmInstanceObject, memory_buffer, kMemoryArrayBuffer,
+                          JSArrayBuffer)
+DEFINE_OPTIONAL_ACCESSORS(WasmInstanceObject, memory_object, kMemoryObject,
+                          WasmMemoryObject)
+DEFINE_OPTIONAL_ACCESSORS(WasmInstanceObject, debug_info, kDebugInfo,
+                          WasmDebugInfo)
+
+WasmModuleObject* WasmInstanceObject::module_object() {
+  return WasmModuleObject::cast(*get_compiled_module()->wasm_module());
+}
+
+WasmModule* WasmInstanceObject::module() {
+  return reinterpret_cast<WasmModuleWrapper*>(
+             *get_compiled_module()->module_wrapper())
+      ->get();
+}
+
+WasmInstanceObject* WasmInstanceObject::cast(Object* object) {
+  DCHECK(IsWasmInstanceObject(object));
+  return reinterpret_cast<WasmInstanceObject*>(object);
+}
+
+bool WasmInstanceObject::IsWasmInstanceObject(Object* object) {
+  if (!object->IsObject()) return false;
+  if (!object->IsJSObject()) return false;
+
+  JSObject* obj = JSObject::cast(object);
+  Isolate* isolate = obj->GetIsolate();
+  if (obj->GetInternalFieldCount() != kFieldCount) {
+    return false;
+  }
+
+  Object* mem = obj->GetInternalField(kMemoryArrayBuffer);
+  if (!(mem->IsUndefined(isolate) || mem->IsJSArrayBuffer()) ||
+      !WasmCompiledModule::IsWasmCompiledModule(
+          obj->GetInternalField(kCompiledModule))) {
+    return false;
+  }
+
+  // All checks passed.
+  return true;
+}
+
+Handle<WasmInstanceObject> WasmInstanceObject::New(
+    Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
+  Handle<Map> map = isolate->factory()->NewMap(
+      JS_OBJECT_TYPE, JSObject::kHeaderSize + kFieldCount * kPointerSize);
+  Handle<WasmInstanceObject> instance(
+      reinterpret_cast<WasmInstanceObject*>(
+          *isolate->factory()->NewJSObjectFromMap(map, TENURED)),
+      isolate);
+
+  instance->SetInternalField(kCompiledModule, *compiled_module);
+  instance->SetInternalField(kMemoryObject, isolate->heap()->undefined_value());
+  return instance;
+}
+
+WasmInstanceObject* WasmExportedFunction::instance() {
+  return WasmInstanceObject::cast(GetInternalField(kInstance));
+}
+
+int WasmExportedFunction::function_index() {
+  return SafeInt32(GetInternalField(kIndex));
+}
+
+WasmExportedFunction* WasmExportedFunction::cast(Object* object) {
+  DCHECK(object && object->IsJSFunction());
+  DCHECK_EQ(Code::JS_TO_WASM_FUNCTION,
+            JSFunction::cast(object)->code()->kind());
+  // TODO(titzer): brand check for WasmExportedFunction.
+  return reinterpret_cast<WasmExportedFunction*>(object);
+}
+
+Handle<WasmExportedFunction> WasmExportedFunction::New(
+    Isolate* isolate, Handle<WasmInstanceObject> instance, Handle<String> name,
+    Handle<Code> export_wrapper, int arity, int func_index) {
+  DCHECK_EQ(Code::JS_TO_WASM_FUNCTION, export_wrapper->kind());
+  Handle<SharedFunctionInfo> shared =
+      isolate->factory()->NewSharedFunctionInfo(name, export_wrapper, false);
+  shared->set_length(arity);
+  shared->set_internal_formal_parameter_count(arity);
+  Handle<JSFunction> function = isolate->factory()->NewFunction(
+      isolate->wasm_function_map(), name, export_wrapper);
+  function->set_shared(*shared);
+
+  function->SetInternalField(kInstance, *instance);
+  function->SetInternalField(kIndex, Smi::FromInt(func_index));
+  return Handle<WasmExportedFunction>::cast(function);
+}
+
+Handle<WasmCompiledModule> WasmCompiledModule::New(
+    Isolate* isolate, Handle<WasmModuleWrapper> module_wrapper) {
+  Handle<FixedArray> ret =
+      isolate->factory()->NewFixedArray(PropertyIndices::Count, TENURED);
+  // WasmCompiledModule::cast would fail since module bytes are not set yet.
+  Handle<WasmCompiledModule> compiled_module(
+      reinterpret_cast<WasmCompiledModule*>(*ret), isolate);
+  compiled_module->InitId();
+  compiled_module->set_module_wrapper(module_wrapper);
+  return compiled_module;
+}
+
+wasm::WasmModule* WasmCompiledModule::module() const {
+  return reinterpret_cast<WasmModuleWrapper*>(*module_wrapper())->get();
+}
+
+void WasmCompiledModule::InitId() {
+#if DEBUG
+  static uint32_t instance_id_counter = 0;
+  set(kID_instance_id, Smi::FromInt(instance_id_counter++));
+  TRACE("New compiled module id: %d\n", instance_id());
+#endif
+}
+
+bool WasmCompiledModule::IsWasmCompiledModule(Object* obj) {
+  if (!obj->IsFixedArray()) return false;
+  FixedArray* arr = FixedArray::cast(obj);
+  if (arr->length() != PropertyIndices::Count) return false;
+  Isolate* isolate = arr->GetIsolate();
+#define WCM_CHECK_SMALL_NUMBER(TYPE, NAME) \
+  if (!arr->get(kID_##NAME)->IsSmi()) return false;
+#define WCM_CHECK_OBJECT_OR_WEAK(TYPE, NAME)         \
+  if (!arr->get(kID_##NAME)->IsUndefined(isolate) && \
+      !arr->get(kID_##NAME)->Is##TYPE())             \
+    return false;
+#define WCM_CHECK_OBJECT(TYPE, NAME) WCM_CHECK_OBJECT_OR_WEAK(TYPE, NAME)
+#define WCM_CHECK_WEAK_LINK(TYPE, NAME) WCM_CHECK_OBJECT_OR_WEAK(WeakCell, NAME)
+#define WCM_CHECK(KIND, TYPE, NAME) WCM_CHECK_##KIND(TYPE, NAME)
+  WCM_PROPERTY_TABLE(WCM_CHECK)
+#undef WCM_CHECK
+
+  // All checks passed.
+  return true;
+}
+
+void WasmCompiledModule::PrintInstancesChain() {
+#if DEBUG
+  if (!FLAG_trace_wasm_instances) return;
+  for (WasmCompiledModule* current = this; current != nullptr;) {
+    PrintF("->%d", current->instance_id());
+    if (current->ptr_to_weak_next_instance() == nullptr) break;
+    CHECK(!current->ptr_to_weak_next_instance()->cleared());
+    current =
+        WasmCompiledModule::cast(current->ptr_to_weak_next_instance()->value());
+  }
+  PrintF("\n");
+#endif
+}
+
+uint32_t WasmCompiledModule::mem_size() const {
+  return has_memory() ? memory()->byte_length()->Number() : default_mem_size();
+}
+
+uint32_t WasmCompiledModule::default_mem_size() const {
+  return min_mem_pages() * WasmModule::kPageSize;
+}