Add an external array type to support typed arrays.

runtime/lib/byte_buffer.cc

Index: runtime/lib/byte_buffer.cc
diff --git a/runtime/lib/byte_buffer.cc b/runtime/lib/byte_buffer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a76113b821ec97cdae421358b1e2ceb05cb838d7
--- /dev/null
+++ b/runtime/lib/byte_buffer.cc
@@ -0,0 +1,226 @@
+// Copyright (c) 2011, 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/assembler.h"
+#include "vm/assert.h"
+#include "vm/bigint_operations.h"
+#include "vm/exceptions.h"
+#include "vm/native_entry.h"
+#include "vm/object.h"
+
+namespace dart {
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_allocate, 2) {
+  const Instance& length_instance = Instance::CheckedHandle(arguments->At(1));
+  if (!length_instance.IsSmi()) {
+    GrowableArray<const Object*> args;
+    args.Add(&length_instance);
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+  }
+  Smi& length = Smi::Handle();
+  length ^= length_instance.raw();
+  if (length.IsNull() || (length.Value() < 0)) {

[Ivan Posva, 2011/11/10 18:06:41]

Shouldn't length.IsNull already be caught by the IsSmi() check above?

[cshapiro, 2011/11/11 00:37:53]

I suppose so.  Fixed.

+    GrowableArray<const Object*> args;
+    args.Add(&length);
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+  }
+  uint8_t* data = new uint8_t[length.Value()];
+  const ByteBuffer& new_array =
+      ByteBuffer::Handle(ByteBuffer::New(data, length.Value()));
+  arguments->SetReturn(new_array);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getLength, 1) {
+  const ByteBuffer& array = ByteBuffer::CheckedHandle(arguments->At(0));
+  if (array.IsNull()) {
+    // TODO(asiva): Need to handle error cases.
+    UNIMPLEMENTED();
+    return;
+  }
+  const Smi& length = Smi::Handle(Smi::New(array.Length()));
+  arguments->SetReturn(length);
+}
+
+
+template<typename T, typename C>
+static void GetIndexed(NativeArguments* arguments) {
+  const ByteBuffer& buffer = ByteBuffer::CheckedHandle(arguments->At(0));
+  const Instance& index_instance = Instance::CheckedHandle(arguments->At(1));
+  if (!index_instance.IsSmi()) {
+    GrowableArray<const Object*> args;
+    args.Add(&index_instance);
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+  }
+  Smi& index = Smi::Handle();
+  index ^= index_instance.raw();
+  if (buffer.IsNull() || index.IsNull()) {
+    // TODO(asiva): Need to handle error cases.
+    UNIMPLEMENTED();
+    return;
+  }
+  if ((index.Value() < 0) || (index.Value() >= buffer.Length())) {
+    GrowableArray<const Object*> arguments;
+    arguments.Add(&index);
+    Exceptions::ThrowByType(Exceptions::kIndexOutOfRange, arguments);
+  }
+  arguments->SetReturn(C::Handle(C::New(buffer.At<T>(index.Value()))));
+}
+
+
+class IntegerValue {
+ public:
+  typedef Integer ValueType;
+  static bool Is(const Instance& obj) { return obj.IsInteger(); }
+  static int64_t ValueOf(const Integer& val) { return val.AsInt64Value(); }
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(IntegerValue);
+};
+
+
+class DoubleValue {
+ public:
+  typedef Double ValueType;
+  static bool Is(const Instance& obj) { return obj.IsDouble(); }
+  static double ValueOf(const Double& val) { return val.value(); }
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(DoubleValue);
+};
+
+
+template<typename T, typename C>
+static void SetIndexed(const NativeArguments* arguments) {
+  const ByteBuffer& buffer = ByteBuffer::CheckedHandle(arguments->At(0));
+  const Instance& index_instance = Instance::CheckedHandle(arguments->At(1));
+  if (!index_instance.IsSmi()) {
+    GrowableArray<const Object*> args;
+    args.Add(&index_instance);
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+  }
+  Smi& index = Smi::Handle();
+  index ^= index_instance.raw();
+  const Instance& value_instance = Instance::CheckedHandle(arguments->At(2));
+  if (buffer.IsNull() || index.IsNull()) {
+    // TODO(asiva): Need to handle error cases.
+    UNIMPLEMENTED();
+    return;
+  }
+  if ((index.Value() < 0) || (index.Value() >= buffer.Length())) {
+    GrowableArray<const Object*> arguments;
+    arguments.Add(&index);
+    Exceptions::ThrowByType(Exceptions::kIndexOutOfRange, arguments);
+  }
+  if (!C::Is(value_instance)) {
+    GrowableArray<const Object*> args;
+    args.Add(&value_instance);
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+  }
+  typename C::ValueType& value = C::ValueType::Handle();
+  value ^= value_instance.raw();
+  buffer.SetAt<T>(index.Value(), C::ValueOf(value));
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getInt8, 2) {
+  GetIndexed<int8_t, Smi>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setInt8, 3) {
+  SetIndexed<int8_t, IntegerValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getUint8, 2) {
+  GetIndexed<uint8_t, Smi>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setUint8, 3) {
+  SetIndexed<uint8_t, IntegerValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getInt16, 2) {
+  GetIndexed<int16_t, Smi>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setInt16, 3) {
+  SetIndexed<int16_t, IntegerValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getUint16, 2) {
+  GetIndexed<uint16_t, Smi>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setUint16, 3) {
+  SetIndexed<uint16_t, IntegerValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getInt32, 2) {
+  GetIndexed<int32_t, Integer>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setInt32, 3) {
+  SetIndexed<int32_t, IntegerValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getUint32, 2) {
+  GetIndexed<uint32_t, Integer>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setUint32, 3) {
+  SetIndexed<uint32_t, IntegerValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getInt64, 2) {
+  GetIndexed<int64_t, Integer>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setInt64, 3) {
+  SetIndexed<int64_t, IntegerValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getUint64, 2) {
+  UNIMPLEMENTED();  // TODO(cshapiro): need getter implementation.
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setUint64, 3) {
+  UNIMPLEMENTED();  // TODO(cshapiro): need setter implementation.
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getFloat32, 2) {
+  GetIndexed<float, Double>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setFloat32, 3) {
+  SetIndexed<float, DoubleValue>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_getFloat64, 2) {
+  GetIndexed<double, Double>(arguments);
+}
+
+
+DEFINE_NATIVE_ENTRY(ByteBuffer_setFloat64, 3) {
+  SetIndexed<double, DoubleValue>(arguments);
+}
+
+}  // namespace dart