Expose transferable constructor to Int8List

runtime/lib/byte_array.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
@@ skipping 24 matching lines @@
 static void LengthCheck(intptr_t len, intptr_t max) {
   if (len < 0 || len > max) {
     const String& error = String::Handle(String::NewFormatted(
         "length (%"Pd") must be in the range [0..%"Pd"]", len, max));
     GrowableArray<const Object*> args;
     args.Add(&error);
     Exceptions::ThrowByType(Exceptions::kArgument, args);
   }
 }
 
+// Returns an aligned array of type T with n entries.
+// Alignment must be >= 16 and a power of two.
+template<typename T>
+T* AllocateAlignedExternalArray(intptr_t n) {
+  intptr_t size = n*sizeof(T); // NOLINT

[cshapiro, 2012/11/30 18:02:16]

This should go away once we have the aforementioned template.  In the future,
always put 2 spaces between the semicolon and the comment.  cpplint will not
catch that since warnings are suppressed by the nolint

[Cutch, 2012/11/30 18:21:43]

Done.

+  void* p = OS::AlignedAllocate(size,
+                                ExternalByteArrayData<T>::kAlignment);
+  return reinterpret_cast<T*>(p);
+}
 
 #define GETTER_ARGUMENTS(ArrayT, ValueT)                                \
   GET_NATIVE_ARGUMENT(ArrayT, array, arguments->NativeArgAt(0));        \
   GET_NATIVE_ARGUMENT(Smi, index, arguments->NativeArgAt(1));
 
 
 #define SETTER_ARGUMENTS(ArrayT, ObjectT, ValueT)                       \
   GET_NATIVE_ARGUMENT(ArrayT, array, arguments->NativeArgAt(0));        \
   GET_NATIVE_ARGUMENT(Smi, index, arguments->NativeArgAt(1));           \
   GET_NATIVE_ARGUMENT(ObjectT, value_object, arguments->NativeArgAt(2));
@@ skipping 223 matching lines @@
 // Int8Array
 
 DEFINE_NATIVE_ENTRY(Int8Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Int8Array::kMaxElements);
   return Int8Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Int8Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Int8Array::kMaxElements);
+  int8_t* bytes = AllocateAlignedExternalArray<int8_t>(len);
+  return ExternalInt8Array::New(bytes,
+                                len,
+                                bytes,
+                                OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Int8Array_getIndexed, 2) {
   GETTER(Int8Array, Smi, int8_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Int8Array_setIndexed, 3) {
   SETTER(Int8Array, Smi, Value, int8_t);
 }
 
 
 // Uint8Array
 
 DEFINE_NATIVE_ENTRY(Uint8Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Uint8Array::kMaxElements);
   return Uint8Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Uint8Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Uint8Array::kMaxElements);
+  uint8_t* bytes = AllocateAlignedExternalArray<uint8_t>(len);
+  return ExternalUint8Array::New(bytes,
+                                 len,
+                                 bytes,
+                                 OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Uint8Array_getIndexed, 2) {
   GETTER(Uint8Array, Smi, uint8_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Uint8Array_setIndexed, 3) {
   SETTER(Uint8Array, Smi, Value, uint8_t);
 }
 
 
 // Int16Array
 
 DEFINE_NATIVE_ENTRY(Int16Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Int16Array::kMaxElements);
   return Int16Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Int16Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Int16Array::kMaxElements);
+  int16_t* bytes = AllocateAlignedExternalArray<int16_t>(len);
+  return ExternalInt16Array::New(bytes,
+                                 len,
+                                 bytes,
+                                 OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Int16Array_getIndexed, 2) {
   GETTER(Int16Array, Smi, int16_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Int16Array_setIndexed, 3) {
   SETTER(Int16Array, Smi, Value, int16_t);
 }
 
 
 // Uint16Array
 
 DEFINE_NATIVE_ENTRY(Uint16Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Uint16Array::kMaxElements);
   return Uint16Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Uint16Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Uint16Array::kMaxElements);
+  uint16_t* bytes = AllocateAlignedExternalArray<uint16_t>(len);
+  return ExternalUint16Array::New(bytes,
+                                  len,
+                                  bytes,
+                                  OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Uint16Array_getIndexed, 2) {
   GETTER(Uint16Array, Smi, uint16_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Uint16Array_setIndexed, 3) {
   SETTER(Uint16Array, Smi, Value, uint16_t);
 }
 
 
 // Int32Array
 
 DEFINE_NATIVE_ENTRY(Int32Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Int32Array::kMaxElements);
   return Int32Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Int32Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Int32Array::kMaxElements);
+  int32_t* bytes = AllocateAlignedExternalArray<int32_t>(len);
+  return ExternalInt32Array::New(bytes,
+                                 len,
+                                 bytes,
+                                 OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Int32Array_getIndexed, 2) {
   GETTER(Int32Array, Integer, int32_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Int32Array_setIndexed, 3) {
   SETTER(Int32Array, Integer, AsInt64Value, int32_t);
 }
 
 
 // Uint32Array
 
 DEFINE_NATIVE_ENTRY(Uint32Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Uint32Array::kMaxElements);
   return Uint32Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Uint32Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Uint32Array::kMaxElements);
+  uint32_t* bytes = AllocateAlignedExternalArray<uint32_t>(len);
+  return ExternalUint32Array::New(bytes,
+                                  len,
+                                  bytes,
+                                  OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Uint32Array_getIndexed, 2) {
   GETTER(Uint32Array, Integer, uint32_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Uint32Array_setIndexed, 3) {
   SETTER(Uint32Array, Integer, AsInt64Value, uint32_t);
 }
 
 
 // Int64Array
 
 DEFINE_NATIVE_ENTRY(Int64Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Int64Array::kMaxElements);
   return Int64Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Int64Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Int64Array::kMaxElements);
+  int64_t* bytes = AllocateAlignedExternalArray<int64_t>(len);
+  return ExternalInt64Array::New(bytes,
+                                 len,
+                                 bytes,
+                                 OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Int64Array_getIndexed, 2) {
   GETTER(Int64Array, Integer, int64_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Int64Array_setIndexed, 3) {
   SETTER(Int64Array, Integer, AsInt64Value, int64_t);
 }
 
 
 // Uint64Array
 
 DEFINE_NATIVE_ENTRY(Uint64Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Uint64Array::kMaxElements);
   return Uint64Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Uint64Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Uint64Array::kMaxElements);
+  uint64_t* bytes = AllocateAlignedExternalArray<uint64_t>(len);
+  return ExternalUint64Array::New(bytes,
+                                  len,
+                                  bytes,
+                                  OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Uint64Array_getIndexed, 2) {
   GETTER_UINT64(Uint64Array);
 }
 
 
 DEFINE_NATIVE_ENTRY(Uint64Array_setIndexed, 3) {
   SETTER_UINT64(Uint64Array);
 }
 
 
 // Float32Array
 
 DEFINE_NATIVE_ENTRY(Float32Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Float32Array::kMaxElements);
   return Float32Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Float32Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Float32Array::kMaxElements);
+  float* bytes = AllocateAlignedExternalArray<float>(len);
+  return ExternalFloat32Array::New(bytes,
+                                   len,
+                                   bytes,
+                                   OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Float32Array_getIndexed, 2) {
   GETTER(Float32Array, Double, float);
 }
 
 
 DEFINE_NATIVE_ENTRY(Float32Array_setIndexed, 3) {
   SETTER(Float32Array, Double, value, float);
 }
 
 
 // Float64Array
 
 DEFINE_NATIVE_ENTRY(Float64Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Float64Array::kMaxElements);
   return Float64Array::New(len);
 }
 
 
+DEFINE_NATIVE_ENTRY(Float64Array_newTransferrable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Float64Array::kMaxElements);
+  double* bytes = AllocateAlignedExternalArray<double>(len);
+  return ExternalFloat64Array::New(bytes,
+                                   len,
+                                   bytes,
+                                   OS::AlignedFree);
+}
+
+
 DEFINE_NATIVE_ENTRY(Float64Array_getIndexed, 2) {
   GETTER(Float64Array, Double, double);
 }
 
 
 DEFINE_NATIVE_ENTRY(Float64Array_setIndexed, 3) {
   SETTER(Float64Array, Double, value, double);
 }
 
 
@@ skipping 110 matching lines @@
 DEFINE_NATIVE_ENTRY(ExternalFloat64Array_getIndexed, 2) {
   GETTER(ExternalFloat64Array, Double, double);
 }
 
 
 DEFINE_NATIVE_ENTRY(ExternalFloat64Array_setIndexed, 3) {
   SETTER(ExternalFloat64Array, Double, value, double);
 }
 
 }  // namespace dart