Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1 | // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "externalize-string-extension.h" |
| 29 | |
| 30 | namespace v8 { |
| 31 | namespace internal { |
| 32 | |
| 33 | template <typename Char, typename Base> |
| 34 | class SimpleStringResource : public Base { |
| 35 | public: |
| 36 | // Takes ownership of |data|. |
| 37 | SimpleStringResource(Char* data, size_t length) |
| 38 | : data_(data), |
| 39 | length_(length) {} |
| 40 | |
| 41 | virtual ~SimpleStringResource() { delete[] data_; } |
| 42 | |
| 43 | virtual const Char* data() const { return data_; } |
| 44 | |
| 45 | virtual size_t length() const { return length_; } |
| 46 | |
| 47 | private: |
| 48 | Char* const data_; |
| 49 | const size_t length_; |
| 50 | }; |
| 51 | |
| 52 | |
| 53 | typedef SimpleStringResource<char, v8::String::ExternalAsciiStringResource> |
| 54 | SimpleAsciiStringResource; |
| 55 | typedef SimpleStringResource<uc16, v8::String::ExternalStringResource> |
| 56 | SimpleTwoByteStringResource; |
| 57 | |
| 58 | |
| 59 | const char* const ExternalizeStringExtension::kSource = |
| 60 | "native function externalizeString();" |
| 61 | "native function isAsciiString();"; |
| 62 | |
| 63 | |
| 64 | v8::Handle<v8::FunctionTemplate> ExternalizeStringExtension::GetNativeFunction( |
| 65 | v8::Handle<v8::String> str) { |
| 66 | if (strcmp(*v8::String::AsciiValue(str), "externalizeString") == 0) { |
| 67 | return v8::FunctionTemplate::New(ExternalizeStringExtension::Externalize); |
| 68 | } else { |
| 69 | ASSERT(strcmp(*v8::String::AsciiValue(str), "isAsciiString") == 0); |
| 70 | return v8::FunctionTemplate::New(ExternalizeStringExtension::IsAscii); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | |
| 75 | v8::Handle<v8::Value> ExternalizeStringExtension::Externalize( |
| 76 | const v8::Arguments& args) { |
| 77 | if (args.Length() < 1 || !args[0]->IsString()) { |
| 78 | return v8::ThrowException(v8::String::New( |
| 79 | "First parameter to externalizeString() must be a string.")); |
| 80 | } |
| 81 | bool force_two_byte = false; |
| 82 | if (args.Length() >= 2) { |
| 83 | if (args[1]->IsBoolean()) { |
| 84 | force_two_byte = args[1]->BooleanValue(); |
| 85 | } else { |
| 86 | return v8::ThrowException(v8::String::New( |
| 87 | "Second parameter to externalizeString() must be a boolean.")); |
| 88 | } |
| 89 | } |
| 90 | bool result = false; |
| 91 | Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>()); |
| 92 | if (string->IsExternalString()) { |
| 93 | return v8::ThrowException(v8::String::New( |
| 94 | "externalizeString() can't externalize twice.")); |
| 95 | } |
| 96 | if (string->IsAsciiRepresentation() && !force_two_byte) { |
| 97 | char* data = new char[string->length()]; |
| 98 | String::WriteToFlat(*string, data, 0, string->length()); |
| 99 | SimpleAsciiStringResource* resource = new SimpleAsciiStringResource( |
| 100 | data, string->length()); |
| 101 | result = string->MakeExternal(resource); |
| 102 | if (result && !string->IsSymbol()) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 103 | HEAP->external_string_table()->AddString(*string); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 104 | } |
| 105 | if (!result) delete resource; |
| 106 | } else { |
| 107 | uc16* data = new uc16[string->length()]; |
| 108 | String::WriteToFlat(*string, data, 0, string->length()); |
| 109 | SimpleTwoByteStringResource* resource = new SimpleTwoByteStringResource( |
| 110 | data, string->length()); |
| 111 | result = string->MakeExternal(resource); |
| 112 | if (result && !string->IsSymbol()) { |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 113 | HEAP->external_string_table()->AddString(*string); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 114 | } |
| 115 | if (!result) delete resource; |
| 116 | } |
| 117 | if (!result) { |
| 118 | return v8::ThrowException(v8::String::New("externalizeString() failed.")); |
| 119 | } |
| 120 | return v8::Undefined(); |
| 121 | } |
| 122 | |
| 123 | |
| 124 | v8::Handle<v8::Value> ExternalizeStringExtension::IsAscii( |
| 125 | const v8::Arguments& args) { |
| 126 | if (args.Length() != 1 || !args[0]->IsString()) { |
| 127 | return v8::ThrowException(v8::String::New( |
| 128 | "isAsciiString() requires a single string argument.")); |
| 129 | } |
| 130 | return Utils::OpenHandle(*args[0].As<v8::String>())->IsAsciiRepresentation() ? |
| 131 | v8::True() : v8::False(); |
| 132 | } |
| 133 | |
| 134 | |
| 135 | void ExternalizeStringExtension::Register() { |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame^] | 136 | static ExternalizeStringExtension* externalize_extension = NULL; |
| 137 | if (externalize_extension == NULL) |
| 138 | externalize_extension = new ExternalizeStringExtension; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 139 | static v8::DeclareExtension externalize_extension_declaration( |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame^] | 140 | externalize_extension); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | } } // namespace v8::internal |