Implement external strings.

runtime/vm/dart_api_impl.cc

 // 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 "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 705 matching lines @@
   HandleScope scope;  // Setup a VM handle scope.
   const String& obj = String::Handle(String::New(codepoints, length));
   return Api::NewLocalHandle(obj);
 }
 
 
 DART_EXPORT Dart_Handle Dart_NewString32(const uint32_t* codepoints,
                                          intptr_t length) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
-  UNIMPLEMENTED();
   const String& obj = String::Handle(String::New(codepoints, length));
   return Api::NewLocalHandle(obj);
 }
 
 
+DART_EXPORT Dart_Handle Dart_NewExternalString8(
+    uint8_t* codepoints,
+    intptr_t length,
+    void* peer,
+    Dart_ExternalString8Finalizer finalizer) {
+  Zone zone;  // Setup a VM zone as we are creating some handles.
+  HandleScope scope;  // Setup a VM handle scope.
+  const String& obj =
+      String::Handle(String::NewExternal(codepoints, length, peer));
+  return Api::NewLocalHandle(obj);
+}
+
+
+DART_EXPORT Dart_Handle Dart_NewExternalString16(
+    uint16_t* codepoints,
+    intptr_t length,
+    void* peer,
+    Dart_ExternalString16Finalizer finalizer) {
+  Zone zone;  // Setup a VM zone as we are creating some handles.
+  HandleScope scope;  // Setup a VM handle scope.
+  const String& obj =
+      String::Handle(String::NewExternal(codepoints, length, peer));
+  return Api::NewLocalHandle(obj);
+}
+
+
+DART_EXPORT Dart_Handle Dart_NewExternalString32(
+    uint32_t* codepoints,
+    intptr_t length,
+    void* peer,
+    Dart_ExternalString32Finalizer finalizer) {
+  Zone zone;  // Setup a VM zone as we are creating some handles.
+  HandleScope scope;  // Setup a VM handle scope.
+  const String& obj =
+      String::Handle(String::NewExternal(codepoints, length, peer));
+  return Api::NewLocalHandle(obj);
+}
+
+
 DART_EXPORT bool Dart_IsString8(Dart_Handle object) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
   const Object& obj = Object::Handle(Api::UnwrapHandle(object));
-  return obj.IsOneByteString();
+  return obj.IsOneByteString() || obj.IsExternalOneByteString();
 }
 
 
 DART_EXPORT bool Dart_IsString16(Dart_Handle object) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
   const Object& obj = Object::Handle(Api::UnwrapHandle(object));
-  return obj.IsOneByteString() || obj.IsTwoByteString();
+  return (obj.IsOneByteString() || obj.IsExternalOneByteString() ||
+          obj.IsTwoByteString() || obj.IsExternalOneByteString());
 }
 
 
 DART_EXPORT Dart_Result Dart_StringGet8(Dart_Handle str,
                                         uint8_t* codepoints,
                                         intptr_t length) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
   const Object& obj = Object::Handle(Api::UnwrapHandle(str));
-  if (obj.IsOneByteString()) {
-    OneByteString& string_obj = OneByteString::Handle();
+  if (obj.IsString()) {
+    String& string_obj = String::Handle();
     string_obj ^= obj.raw();
-    intptr_t str_len = string_obj.Length();
-    intptr_t copy_len = (str_len > length) ? length : str_len;
-    for (intptr_t i = 0; i < copy_len; i++) {
-      codepoints[i] = static_cast<uint8_t>(string_obj.CharAt(i));
+    if (string_obj.CharSize() == String::kOneByteChar) {
+      intptr_t str_len = string_obj.Length();
+      intptr_t copy_len = (str_len > length) ? length : str_len;
+      for (intptr_t i = 0; i < copy_len; i++) {
+        codepoints[i] = static_cast<uint8_t>(string_obj.CharAt(i));
+      }
+      RETURN_CINT(copy_len);
     }
-    RETURN_CINT(copy_len);
   }
   RETURN_FAILURE(obj.IsString() ? "Object is not a String8" :
                                   "Object is not a String");
 }
 
 
 DART_EXPORT Dart_Result Dart_StringGet16(Dart_Handle str,
                                          uint16_t* codepoints,
                                          intptr_t length) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
   const Object& obj = Object::Handle(Api::UnwrapHandle(str));
-  if (obj.IsOneByteString() || obj.IsTwoByteString()) {
+  if (obj.IsString()) {
     String& string_obj = String::Handle();
     string_obj ^= obj.raw();
-    intptr_t str_len = string_obj.Length();
-    intptr_t copy_len = (str_len > length) ? length : str_len;
-    for (intptr_t i = 0; i < copy_len; i++) {
-      codepoints[i] = static_cast<uint16_t>(string_obj.CharAt(i));
+    if (string_obj.CharSize() <= String::kTwoByteChar) {
+      intptr_t str_len = string_obj.Length();
+      intptr_t copy_len = (str_len > length) ? length : str_len;
+      for (intptr_t i = 0; i < copy_len; i++) {
+        codepoints[i] = static_cast<uint16_t>(string_obj.CharAt(i));
+      }
+      RETURN_CINT(copy_len);
     }
-    RETURN_CINT(copy_len);
   }
   RETURN_FAILURE(obj.IsString() ? "Object is not a String16" :
                                   "Object is not a String");
 }
 
 
 DART_EXPORT Dart_Result Dart_StringGet32(Dart_Handle str,
                                          uint32_t* codepoints,
                                          intptr_t length) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
   const Object& obj = Object::Handle(Api::UnwrapHandle(str));
   if (obj.IsString()) {
     String& string_obj = String::Handle();
     string_obj ^= obj.raw();
-    intptr_t str_len = string_obj.Length();
-    intptr_t copy_len = (str_len > length) ? length : str_len;
-    for (intptr_t i = 0; i < copy_len; i++) {
-      codepoints[i] = static_cast<uint32_t>(string_obj.CharAt(i));
+    if (string_obj.CharSize() <= String::kFourByteChar) {
+      intptr_t str_len = string_obj.Length();
+      intptr_t copy_len = (str_len > length) ? length : str_len;
+      for (intptr_t i = 0; i < copy_len; i++) {
+        codepoints[i] = static_cast<uint32_t>(string_obj.CharAt(i));
+      }
+      RETURN_CINT(copy_len);
     }
-    RETURN_CINT(copy_len);
   }
   RETURN_FAILURE("Object is not a String");
 }
 
 
 DART_EXPORT Dart_Result Dart_StringToCString(Dart_Handle object) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
   const Object& obj = Object::Handle(Api::UnwrapHandle(object));
   if (obj.IsString()) {
     const char* string_value = obj.ToCString();
     intptr_t string_length = strlen(string_value);
     char* result = reinterpret_cast<char*>(Api::Allocate(string_length + 1));
     if (result == NULL) {
       RETURN_FAILURE("Unable to allocate memory");
     }
     strncpy(result, string_value, string_length + 1);
     ASSERT(result[string_length] == '\0');
     RETURN_CSTRING(result);
   }
   RETURN_FAILURE("Object is not a String");
 }
 
 
+DART_EXPORT Dart_Result Dart_ExternalStringPeer(Dart_Handle object,
+                                                void** peer) {
+  const Object& obj = Object::Handle(Api::UnwrapHandle(object));
+  if (obj.IsExternalOneByteString()) {
+    ExternalOneByteString& str = ExternalOneByteString::Handle();
+    str ^= obj.raw();
+    *peer = str.Peer();
+    RETURN_CBOOLEAN(true);
+  }
+  if (obj.IsExternalTwoByteString()) {
+    ExternalTwoByteString& str = ExternalTwoByteString::Handle();
+    str ^= obj.raw();
+    *peer = str.Peer();
+    RETURN_CBOOLEAN(true);
+  }
+  if (obj.IsExternalFourByteString()) {
+    ExternalFourByteString& str = ExternalFourByteString::Handle();
+    str ^= obj.raw();
+    *peer = str.Peer();
+    RETURN_CBOOLEAN(true);
+  }
+  RETURN_FAILURE("Object is not an external String");
+}
+
+
 DART_EXPORT bool Dart_IsArray(Dart_Handle object) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
   HandleScope scope;  // Setup a VM handle scope.
   const Object& obj = Object::Handle(Api::UnwrapHandle(object));
   return obj.IsArray();
 }
 
 
 DART_EXPORT Dart_Handle Dart_NewArray(intptr_t length) {
   Zone zone;  // Setup a VM zone as we are creating some handles.
@@ skipping 882 matching lines @@
   ASSERT(isolate != NULL);
   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
   ApiLocalScope* scope = state->top_scope();
   ASSERT(scope != NULL);
   return scope->zone().Reallocate(ptr, old_size, new_size);
 }
 
 
 }  // namespace dart