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

src/wasm/wasm-objects.h

+// Copyright 2016 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_OBJECTS_H_
+#define V8_WASM_OBJECTS_H_
+
+#include "src/objects-inl.h"
+#include "src/wasm/managed.h"
+
+#define DECLARE_CASTS(name)             \
+  static bool Is##name(Object* object); \
+  static name* cast(Object* object)
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+struct WasmModule;
+}
+
+class WasmCompiledModule;
+class WasmDebugInfo;
+class WasmInstanceObject;
+
+// Representation of a WebAssembly.Module JavaScript-level object.
+class WasmModuleObject : public JSObject {
+ public:
+  // TODO(titzer): add the brand as an internal field instead of a property.
+  enum Fields { kCompiledModule, kFieldCount };
+
+  DECLARE_CASTS(WasmModuleObject);
+
+  WasmCompiledModule* compiled_module();
+  wasm::WasmModule* module();
+  int num_functions();
+  bool is_asm_js();
+  int GetAsmWasmSourcePosition(int func_index, int byte_offset);
+  WasmDebugInfo* debug_info();
+  void set_debug_info(WasmDebugInfo* debug_info);
+  MaybeHandle<String> GetFunctionName(Isolate* isolate, int func_index);
+
+  static Handle<WasmModuleObject> New(
+      Isolate* isolate, Handle<WasmCompiledModule> compiled_module);
+};
+
+// Representation of a WebAssembly.Table JavaScript-level object.
+class WasmTableObject : public JSObject {
+ public:
+  // TODO(titzer): add the brand as an internal field instead of a property.
+  enum Fields { kArray, kMaximum, kDispatchTables, kFieldCount };
+
+  DECLARE_CASTS(WasmTableObject);
+
+  uint32_t current_length();
+  uint32_t maximum_length();
+
+  static Handle<WasmTableObject> New(Isolate* isolate, uint32_t initial,
+                                     bool has_maximum, uint32_t maximum,
+                                     Handle<FixedArray>* js_functions);
+  static bool Grow(Handle<WasmTableObject> table, uint32_t count);
+  static Handle<FixedArray> AddDispatchTable(
+      Isolate* isolate, Handle<WasmTableObject> table,
+      Handle<WasmInstanceObject> instance, int table_index,
+      Handle<FixedArray> dispatch_table);
+};
+
+// Representation of a WebAssembly.Memory JavaScript-level object.
+class WasmMemoryObject : public JSObject {
+ public:
+  // TODO(titzer): add the brand as an internal field instead of a property.
+  enum Fields : uint8_t { kArrayBuffer, kMaximum, kInstance, kFieldCount };
+
+  DECLARE_CASTS(WasmMemoryObject);
+
+  void AddInstance(WasmInstanceObject* object);
+  JSArrayBuffer* get_buffer();
+  void set_buffer(JSArrayBuffer* buffer);
+  uint32_t current_pages();
+  int32_t maximum_pages();  // returns < 0 if there is no maximum
+
+  static Handle<WasmMemoryObject> New(Isolate* isolate,
+                                      Handle<JSArrayBuffer> buffer,
+                                      int maximum);
+
+  static bool Grow(Handle<WasmMemoryObject> memory, uint32_t count);
+};
+
+// Representation of a WebAssembly.Instance JavaScript-level object.
+class WasmInstanceObject : public JSObject {
+ public:
+  // TODO(titzer): add the brand as an internal field instead of a property.
+  enum Fields {
+    kCompiledModule,
+    kMemoryObject,
+    kMemoryArrayBuffer,
+    kGlobalsArrayBuffer,
+    kDebugInfo,
+    kFieldCount
+  };
+
+  DECLARE_CASTS(WasmInstanceObject);
+
+  WasmCompiledModule* compiled_module();
+  WasmModuleObject* module_object();
+  wasm::WasmModule* module();
+  uint64_t mem_size();
+  Script* script();
+
+  static Handle<WasmInstanceObject> New(Isolate* isolate);
+};
+
+// Representation of an exported WASM function.
+class WasmExportedFunction : public JSFunction {
+ public:
+  enum Fields { kInstance, kIndex, kFieldCount };
+
+  DECLARE_CASTS(WasmExportedFunction);
+
+  WasmInstanceObject* instance();
+  int function_index();
+
+  static Handle<WasmExportedFunction> New(Isolate* isolate,
+                                          Handle<WasmInstanceObject> instance,
+                                          Handle<String> name,
+                                          Handle<Code> export_wrapper,
+                                          int arity, int func_index);
+};
+
+class WasmCompiledModule : public FixedArray {
+ public:
+  enum Fields { kFieldCount };
+
+  static WasmCompiledModule* cast(Object* fixed_array) {
+    SLOW_DCHECK(IsWasmCompiledModule(fixed_array));
+    return reinterpret_cast<WasmCompiledModule*>(fixed_array);
+  }
+
+#define WCM_OBJECT_OR_WEAK(TYPE, NAME, ID)                           \
+  Handle<TYPE> NAME() const { return handle(ptr_to_##NAME()); }      \
+                                                                     \
+  MaybeHandle<TYPE> maybe_##NAME() const {                           \
+    if (has_##NAME()) return NAME();                                 \
+    return MaybeHandle<TYPE>();                                      \
+  }                                                                  \
+                                                                     \
+  TYPE* ptr_to_##NAME() const {                                      \
+    Object* obj = get(ID);                                           \
+    if (!obj->Is##TYPE()) return nullptr;                            \
+    return TYPE::cast(obj);                                          \
+  }                                                                  \
+                                                                     \
+  void set_##NAME(Handle<TYPE> value) { set_ptr_to_##NAME(*value); } \
+                                                                     \
+  void set_ptr_to_##NAME(TYPE* value) { set(ID, value); }            \
+                                                                     \
+  bool has_##NAME() const { return get(ID)->Is##TYPE(); }            \
+                                                                     \
+  void reset_##NAME() { set_undefined(ID); }
+
+#define WCM_OBJECT(TYPE, NAME) WCM_OBJECT_OR_WEAK(TYPE, NAME, kID_##NAME)
+
+#define WCM_SMALL_NUMBER(TYPE, NAME)                               \
+  TYPE NAME() const {                                              \
+    return static_cast<TYPE>(Smi::cast(get(kID_##NAME))->value()); \
+  }                                                                \
+  void set_##NAME(TYPE value) { set(kID_##NAME, Smi::FromInt(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 CORE_WCM_PROPERTY_TABLE(MACRO)                \
+  MACRO(OBJECT, FixedArray, code_table)               \
+  MACRO(OBJECT, Foreign, module_wrapper)              \
+  MACRO(OBJECT, SeqOneByteString, module_bytes)       \
+  MACRO(OBJECT, Script, asm_js_script)                \
+  MACRO(OBJECT, FixedArray, function_tables)          \
+  MACRO(OBJECT, FixedArray, empty_function_tables)    \
+  MACRO(OBJECT, ByteArray, asm_js_offset_tables)      \
+  MACRO(OBJECT, JSArrayBuffer, memory)                \
+  MACRO(SMALL_NUMBER, uint32_t, min_mem_pages)        \
+  MACRO(SMALL_NUMBER, uint32_t, max_mem_pages)        \
+  MACRO(WEAK_LINK, WasmCompiledModule, next_instance) \
+  MACRO(WEAK_LINK, WasmCompiledModule, prev_instance) \
+  MACRO(WEAK_LINK, JSObject, owning_instance)         \
+  MACRO(WEAK_LINK, JSObject, wasm_module)
+
+#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, Handle<Managed<wasm::WasmModule>> module_wrapper);
+
+  static Handle<WasmCompiledModule> Clone(Isolate* isolate,
+                                          Handle<WasmCompiledModule> module) {
+    Handle<WasmCompiledModule> ret = Handle<WasmCompiledModule>::cast(
+        isolate->factory()->CopyFixedArray(module));
+    ret->InitId();
+    ret->reset_weak_owning_instance();
+    ret->reset_weak_next_instance();
+    ret->reset_weak_prev_instance();
+    return ret;
+  }
+
+  uint32_t mem_size() const;
+  uint32_t default_mem_size() const;
+
+  wasm::WasmModule* module() const;
+
+#define DECLARATION(KIND, TYPE, NAME) WCM_##KIND(TYPE, NAME)
+  WCM_PROPERTY_TABLE(DECLARATION)
+#undef DECLARATION
+
+  static bool IsWasmCompiledModule(Object* obj);
+
+  void PrintInstancesChain();
+
+  static void RecreateModuleWrapper(Isolate* isolate,
+                                    Handle<FixedArray> compiled_module);
+
+ private:
+  void InitId();
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WasmCompiledModule);
+};
+
+class WasmDebugInfo : public FixedArray {
+ public:
+  enum class Fields { kFieldCount };
+
+  static Handle<WasmDebugInfo> New(Handle<JSObject> wasm);
+
+  static bool IsDebugInfo(Object* object);
+  static WasmDebugInfo* cast(Object* object);
+
+  JSObject* wasm_instance();
+
+  bool SetBreakPoint(int byte_offset);
+
+  // Get the Script for the specified function.
+  static Script* GetFunctionScript(Handle<WasmDebugInfo> debug_info,
+                                   int func_index);
+
+  // Disassemble the specified function from this module.
+  static Handle<String> DisassembleFunction(Handle<WasmDebugInfo> debug_info,
+                                            int func_index);
+
+  // Get the offset table for the specified function, mapping from byte offsets
+  // to position in the disassembly.
+  // Returns an array with three entries per instruction: byte offset, line and
+  // column.
+  static Handle<FixedArray> GetFunctionOffsetTable(
+      Handle<WasmDebugInfo> debug_info, int func_index);
+
+  // Get the asm.js source position from a byte offset.
+  // Must only be called if the associated wasm object was created from asm.js.
+  static int GetAsmJsSourcePosition(Handle<WasmDebugInfo> debug_info,
+                                    int func_index, int byte_offset);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_WASM_OBJECTS_H_