| // 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::GetNativeFunction( |
| v8::Handle<v8::String> str) { |
| if (strcmp(*v8::String::AsciiValue(str), "externalizeString") == 0) { |
| return v8::FunctionTemplate::New(ExternalizeStringExtension::Externalize); |
| } else { |
| ASSERT(strcmp(*v8::String::AsciiValue(str), "isAsciiString") == 0); |
| return v8::FunctionTemplate::New(ExternalizeStringExtension::IsAscii); |
| } |
| } |
| |
| |
| v8::Handle<v8::Value> ExternalizeStringExtension::Externalize( |
| const v8::Arguments& args) { |
| if (args.Length() < 1 || !args[0]->IsString()) { |
| return v8::ThrowException(v8::String::New( |
| "First parameter to externalizeString() must be a string.")); |
| } |
| bool force_two_byte = false; |
| if (args.Length() >= 2) { |
| if (args[1]->IsBoolean()) { |
| force_two_byte = args[1]->BooleanValue(); |
| } else { |
| return v8::ThrowException(v8::String::New( |
| "Second parameter to externalizeString() must be a boolean.")); |
| } |
| } |
| bool result = false; |
| Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>()); |
| if (string->IsExternalString()) { |
| return v8::ThrowException(v8::String::New( |
| "externalizeString() can't externalize twice.")); |
| } |
| 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()) { |
| 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()) { |
| HEAP->external_string_table()->AddString(*string); |
| } |
| if (!result) delete resource; |
| } |
| if (!result) { |
| return v8::ThrowException(v8::String::New("externalizeString() failed.")); |
| } |
| return v8::Undefined(); |
| } |
| |
| |
| v8::Handle<v8::Value> ExternalizeStringExtension::IsAscii( |
| const v8::Arguments& args) { |
| if (args.Length() != 1 || !args[0]->IsString()) { |
| return v8::ThrowException(v8::String::New( |
| "isAsciiString() requires a single string argument.")); |
| } |
| return |
| Utils::OpenHandle(*args[0].As<v8::String>())->IsOneByteRepresentation() ? |
| v8::True() : v8::False(); |
| } |
| |
| |
| void ExternalizeStringExtension::Register() { |
| static ExternalizeStringExtension externalize_extension; |
| static v8::DeclareExtension declaration(&externalize_extension); |
| } |
| |
| } } // namespace v8::internal |