// Copyright 2010 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 "externalize-string-extension.h" namespace v8 { namespace internal { template <typename Char, typename Base> class SimpleStringResource : public Base { public: // Takes ownership of |data|. SimpleStringResource(Char* data, size_t length) : data_(data), length_(length) {} virtual ~SimpleStringResource() { delete[] data_; } virtual const Char* data() const { return data_; } virtual size_t length() const { return length_; } private: Char* const data_; const size_t length_; }; typedef SimpleStringResource<char, v8::String::ExternalAsciiStringResource> SimpleAsciiStringResource; typedef SimpleStringResource<uc16, v8::String::ExternalStringResource> SimpleTwoByteStringResource; const char* const ExternalizeStringExtension::kSource = "native function externalizeString();" "native function isAsciiString();"; v8::Handle<v8::FunctionTemplate> ExternalizeStringExtension::GetNativeFunctionTemplate( v8::Isolate* isolate, v8::Handle<v8::String> str) { if (strcmp(*v8::String::Utf8Value(str), "externalizeString") == 0) { return v8::FunctionTemplate::New(ExternalizeStringExtension::Externalize); } else { ASSERT(strcmp(*v8::String::Utf8Value(str), "isAsciiString") == 0); return v8::FunctionTemplate::New(ExternalizeStringExtension::IsAscii); } } void ExternalizeStringExtension::Externalize( const v8::FunctionCallbackInfo<v8::Value>& args) { if (args.Length() < 1 || !args[0]->IsString()) { args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( args.GetIsolate(), "First parameter to externalizeString() must be a string.")); return; } bool force_two_byte = false; if (args.Length() >= 2) { if (args[1]->IsBoolean()) { force_two_byte = args[1]->BooleanValue(); } else { args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( args.GetIsolate(), "Second parameter to externalizeString() must be a boolean.")); return; } } bool result = false; Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>()); if (string->IsExternalString()) { args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( args.GetIsolate(), "externalizeString() can't externalize twice.")); return; } if (string->IsOneByteRepresentation() && !force_two_byte) { uint8_t* data = new uint8_t[string->length()]; String::WriteToFlat(*string, data, 0, string->length()); SimpleAsciiStringResource* resource = new SimpleAsciiStringResource( reinterpret_cast<char*>(data), string->length()); result = string->MakeExternal(resource); if (result && !string->IsInternalizedString()) { i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); isolate->heap()->external_string_table()->AddString(*string); } if (!result) delete resource; } else { uc16* data = new uc16[string->length()]; String::WriteToFlat(*string, data, 0, string->length()); SimpleTwoByteStringResource* resource = new SimpleTwoByteStringResource( data, string->length()); result = string->MakeExternal(resource); if (result && !string->IsInternalizedString()) { i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); isolate->heap()->external_string_table()->AddString(*string); } if (!result) delete resource; } if (!result) { args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( args.GetIsolate(), "externalizeString() failed.")); return; } } void ExternalizeStringExtension::IsAscii( const v8::FunctionCallbackInfo<v8::Value>& args) { if (args.Length() != 1 || !args[0]->IsString()) { args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( args.GetIsolate(), "isAsciiString() requires a single string argument.")); return; } bool is_one_byte = Utils::OpenHandle(*args[0].As<v8::String>())->IsOneByteRepresentation(); args.GetReturnValue().Set(is_one_byte); } void ExternalizeStringExtension::Register() { static ExternalizeStringExtension externalize_extension; static v8::DeclareExtension declaration(&externalize_extension); } } } // namespace v8::internal