[wasm] tracing for wasm module instances

src/wasm/wasm-module.h

 // 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.
 
 #ifndef V8_WASM_MODULE_H_
 #define V8_WASM_MODULE_H_
 
 #include <memory>
 
 #include "src/api.h"
@@ skipping 364 matching lines @@
     return static_cast<TYPE>(Smi::cast(get(kID_##NAME))->value()); \
   }
 
 #define WCM_WEAK_LINK(TYPE, NAME)                        \
   WCM_OBJECT_OR_WEAK(WeakCell, weak_##NAME, kID_##NAME); \
                                                          \
   Handle<TYPE> NAME() const {                            \
     return handle(TYPE::cast(weak_##NAME()->value()));   \
   }
 
-#define WCM_PROPERTY_TABLE(MACRO)                     \
+#define CORE_WCM_PROPERTY_TABLE(MACRO)                \
   MACRO(OBJECT, FixedArray, code_table)               \
   MACRO(OBJECT, FixedArray, import_data)              \
   MACRO(OBJECT, FixedArray, exports)                  \
   MACRO(OBJECT, FixedArray, startup_function)         \
   MACRO(OBJECT, FixedArray, indirect_function_tables) \
   MACRO(OBJECT, String, module_bytes)                 \
   MACRO(OBJECT, ByteArray, function_names)            \
   MACRO(SMALL_NUMBER, uint32_t, min_memory_pages)     \
   MACRO(OBJECT, FixedArray, data_segments_info)       \
   MACRO(OBJECT, ByteArray, data_segments)             \
   MACRO(SMALL_NUMBER, uint32_t, globals_size)         \
   MACRO(OBJECT, JSArrayBuffer, heap)                  \
   MACRO(SMALL_NUMBER, bool, export_memory)            \
   MACRO(SMALL_NUMBER, ModuleOrigin, origin)           \
   MACRO(WEAK_LINK, WasmCompiledModule, next_instance) \
   MACRO(WEAK_LINK, WasmCompiledModule, prev_instance) \
   MACRO(WEAK_LINK, JSObject, owning_instance)         \
   MACRO(WEAK_LINK, JSObject, module_object)
 
+#if DEBUG
+#define DEBUG_ONLY_TABLE(MACRO) MACRO(SMALL_NUMBER, uint32_t, instance_id)
+#else
+#define DEBUG_ONLY_TABLE(IGNORE)
+  uint32_t instance_id() const { return -1; }
+#endif
+
+#define WCM_PROPERTY_TABLE(MACRO) \
+  CORE_WCM_PROPERTY_TABLE(MACRO)  \
+  DEBUG_ONLY_TABLE(MACRO)
+
  private:
   enum PropertyIndices {
 #define INDICES(IGNORE1, IGNORE2, NAME) kID_##NAME,
     WCM_PROPERTY_TABLE(INDICES) Count
 #undef INDICES
   };
 
  public:
   static Handle<WasmCompiledModule> New(Isolate* isolate,
                                         uint32_t min_memory_pages,
                                         uint32_t globals_size,
                                         bool export_memory,
                                         ModuleOrigin origin);
 
   static Handle<WasmCompiledModule> Clone(Isolate* isolate,
                                           Handle<WasmCompiledModule> module) {
     Handle<WasmCompiledModule> ret = Handle<WasmCompiledModule>::cast(
         isolate->factory()->CopyFixedArray(module));
+    ret->Init();
+    ret->reset_weak_owning_instance();
+    ret->reset_weak_next_instance();
+    ret->reset_weak_prev_instance();
     return ret;
   }
 
   uint32_t mem_size() const {
     DCHECK(has_heap());
     return heap()->byte_length()->Number();
   }
 
   uint32_t default_mem_size() const {
     return min_memory_pages() * WasmModule::kPageSize;
   }
 
 #define DECLARATION(KIND, TYPE, NAME) WCM_##KIND(TYPE, NAME)
   WCM_PROPERTY_TABLE(DECLARATION)
 #undef DECLARATION
 
+  void PrintInstancesChain();
+
  private:
+#if DEBUG
+  static uint32_t instance_id_counter_;
+#endif
+  void Init();
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(WasmCompiledModule);
 };
 
 // Extract a function name from the given wasm object.
 // Returns "<WASM UNNAMED>" if the function is unnamed or the name is not a
 // valid UTF-8 string.
 Handle<String> GetWasmFunctionName(Isolate* isolate, Handle<Object> wasm,
                                    uint32_t func_index);
 
 // Extract a function name from the given wasm object.
@@ skipping 72 matching lines @@
                             int instance_count);
 void ValidateModuleState(Isolate* isolate, Handle<JSObject> module_obj);
 void ValidateOrphanedInstance(Isolate* isolate, Handle<JSObject> instance);
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_