new style of property/function callbacks

src/arguments.cc

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+#include "arguments.h"
+
+namespace v8 {
+namespace internal {
+
+
+static bool Match(void* a, void* b) {
+  return a == b;
+}
+
+
+static uint32_t Hash(void* function) {
+  uintptr_t as_int = reinterpret_cast<uintptr_t>(function);
+  if (sizeof(function) == 4) return static_cast<uint32_t>(as_int);
+  uint64_t as_64 = static_cast<uint64_t>(as_int);
+  return
+      static_cast<uint32_t>(as_64 >> 32) ^
+      static_cast<uint32_t>(as_64);
+}
+
+
+CallbackTable::CallbackTable(): map_(Match, 64) {}
+
+
+bool CallbackTable::Contains(void* function) {
+  ASSERT(function != NULL);
+  return map_.Lookup(function, Hash(function), false) != NULL;
+}
+
+
+void CallbackTable::InsertCallback(Isolate* isolate,
+                           void* function,
+                           bool returns_void) {
+  if (function == NULL) return;
+  // Don't store for performance.
+  if (kStoreVoidFunctions != returns_void) return;
+  CallbackTable* table = isolate->callback_table();
+  if (table == NULL) {
+    table = new CallbackTable();
+    isolate->set_callback_table(table);
+  }
+  typedef HashMap::Entry Entry;
+  Entry* entry = table->map_.Lookup(function, Hash(function), true);
+  ASSERT(entry != NULL);
+  ASSERT(entry->value == NULL || entry->value == function);
+  entry->value = function;
+}
+
+
+template<typename T>
+template<typename V>
+v8::Handle<V> CustomArguments<T>::GetReturnValue(Isolate* isolate) {
+  // Check the ReturnValue.
+  Object** handle = &this->end()[kReturnValueOffset];
+  // Nothing was set, return empty handle as per previous behaviour.
+  if ((*handle)->IsTheHole()) return v8::Handle<V>();
+  return v8::Handle<V>(reinterpret_cast<V*>(handle));
+}
+
+
+v8::Handle<v8::Value> FunctionCallbackArguments::Call(InvocationCallback f) {
+  Isolate* isolate = this->isolate();
+  void* f_as_void = CallbackTable::FunctionToVoidPtr(f);
+  bool new_style = CallbackTable::ReturnsVoid(isolate, f_as_void);
+  if (new_style) {
+    FunctionCallback c = reinterpret_cast<FunctionCallback>(f);
+    FunctionCallbackInfo<v8::Value> info(end(),
+                                         argv_,
+                                         argc_,
+                                         is_construct_call_);
+    c(info);
+  } else {
+    v8::Arguments args(end(),
+                       argv_,
+                       argc_,
+                       is_construct_call_);
+    v8::Handle<v8::Value> return_value = f(args);
+    if (!return_value.IsEmpty()) return return_value;
+  }
+  return GetReturnValue<v8::Value>(isolate);
+}
+
+
+#define WRITE_CALL_0(OldFunction, NewFunction, ReturnValue)                    \
+v8::Handle<ReturnValue> PropertyCallbackArguments::Call(OldFunction f) {       \
+  Isolate* isolate = this->isolate();                                          \
+  void* f_as_void = CallbackTable::FunctionToVoidPtr(f);                       \
+  bool new_style = CallbackTable::ReturnsVoid(isolate, f_as_void);             \
+  if (new_style) {                                                             \
+    NewFunction c = reinterpret_cast<NewFunction>(f);                          \
+    PropertyCallbackInfo<ReturnValue> info(end());                             \
+    c(info);                                                                   \
+  } else {                                                                     \
+    v8::AccessorInfo info(end());                                              \
+    v8::Handle<ReturnValue> return_value = f(info);                            \
+    if (!return_value.IsEmpty()) return return_value;                          \
+  }                                                                            \
+  return GetReturnValue<ReturnValue>(isolate);                                 \
+}
+
+#define WRITE_CALL_1(OldFunction, NewFunction, ReturnValue, Arg1)              \
+v8::Handle<ReturnValue> PropertyCallbackArguments::Call(OldFunction f,         \
+                                                        Arg1 arg1) {           \
+  Isolate* isolate = this->isolate();                                          \
+  void* f_as_void = CallbackTable::FunctionToVoidPtr(f);                       \
+  bool new_style = CallbackTable::ReturnsVoid(isolate, f_as_void);             \
+  if (new_style) {                                                             \
+    NewFunction c = reinterpret_cast<NewFunction>(f);                          \
+    PropertyCallbackInfo<ReturnValue> info(end());                             \
+    c(arg1, info);                                                             \
+  } else {                                                                     \
+    v8::AccessorInfo info(end());                                              \
+    v8::Handle<ReturnValue> return_value = f(arg1, info);                      \
+    if (!return_value.IsEmpty()) return return_value;                          \
+  }                                                                            \
+  return GetReturnValue<ReturnValue>(isolate);                                 \
+}
+
+#define WRITE_CALL_2(OldFunction, NewFunction, ReturnValue, Arg1, Arg2)        \
+v8::Handle<ReturnValue> PropertyCallbackArguments::Call(OldFunction f,         \
+                                                        Arg1 arg1,             \
+                                                        Arg2 arg2) {           \
+  Isolate* isolate = this->isolate();                                          \
+  void* f_as_void = CallbackTable::FunctionToVoidPtr(f);                       \
+  bool new_style = CallbackTable::ReturnsVoid(isolate, f_as_void);             \
+  if (new_style) {                                                             \
+    NewFunction c = reinterpret_cast<NewFunction>(f);                          \
+    PropertyCallbackInfo<ReturnValue> info(end());                             \
+    c(arg1, arg2, info);                                                       \
+  } else {                                                                     \
+    v8::AccessorInfo info(end());                                              \
+    v8::Handle<ReturnValue> return_value = f(arg1, arg2, info);                \
+    if (!return_value.IsEmpty()) return return_value;                          \
+  }                                                                            \
+  return GetReturnValue<ReturnValue>(isolate);                                 \
+}
+
+#define WRITE_CALL_2_VOID(OldFunction, NewFunction, ReturnValue, Arg1, Arg2)   \
+void PropertyCallbackArguments::Call(OldFunction f,                            \
+                                     Arg1 arg1,                                \
+                                     Arg2 arg2) {                              \
+  Isolate* isolate = this->isolate();                                          \
+  void* f_as_void = CallbackTable::FunctionToVoidPtr(f);                       \
+  bool new_style = CallbackTable::ReturnsVoid(isolate, f_as_void);             \
+  if (new_style) {                                                             \
+    NewFunction c = reinterpret_cast<NewFunction>(f);                          \
+    PropertyCallbackInfo<ReturnValue> info(end());                             \
+    c(arg1, arg2, info);                                                       \
+  } else {                                                                     \
+    v8::AccessorInfo info(end());                                              \
+    f(arg1, arg2, info);                                                       \
+  }                                                                            \
+}
+
+FOR_EACH_CALLBACK_TABLE_MAPPING_0(WRITE_CALL_0)
+FOR_EACH_CALLBACK_TABLE_MAPPING_1(WRITE_CALL_1)
+FOR_EACH_CALLBACK_TABLE_MAPPING_2(WRITE_CALL_2)
+FOR_EACH_CALLBACK_TABLE_MAPPING_2_VOID_RETURN(WRITE_CALL_2_VOID)
+
+#undef WRITE_CALL_0
+#undef WRITE_CALL_1
+#undef WRITE_CALL_2
+#undef WRITE_CALL_2_VOID
+
+
+} }  // namespace v8::internal
+