Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 1 | // Copyright 2010 the V8 project authors. All rights reserved. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 4 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 5 | #include "src/extensions/externalize-string-extension.h" |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 6 | |
| 7 | namespace v8 { |
| 8 | namespace internal { |
| 9 | |
| 10 | template <typename Char, typename Base> |
| 11 | class SimpleStringResource : public Base { |
| 12 | public: |
| 13 | // Takes ownership of |data|. |
| 14 | SimpleStringResource(Char* data, size_t length) |
| 15 | : data_(data), |
| 16 | length_(length) {} |
| 17 | |
| 18 | virtual ~SimpleStringResource() { delete[] data_; } |
| 19 | |
| 20 | virtual const Char* data() const { return data_; } |
| 21 | |
| 22 | virtual size_t length() const { return length_; } |
| 23 | |
| 24 | private: |
| 25 | Char* const data_; |
| 26 | const size_t length_; |
| 27 | }; |
| 28 | |
| 29 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 30 | typedef SimpleStringResource<char, v8::String::ExternalOneByteStringResource> |
| 31 | SimpleOneByteStringResource; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 32 | typedef SimpleStringResource<uc16, v8::String::ExternalStringResource> |
| 33 | SimpleTwoByteStringResource; |
| 34 | |
| 35 | |
| 36 | const char* const ExternalizeStringExtension::kSource = |
| 37 | "native function externalizeString();" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 38 | "native function isOneByteString();"; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 39 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 40 | v8::Handle<v8::FunctionTemplate> |
| 41 | ExternalizeStringExtension::GetNativeFunctionTemplate( |
| 42 | v8::Isolate* isolate, v8::Handle<v8::String> str) { |
| 43 | if (strcmp(*v8::String::Utf8Value(str), "externalizeString") == 0) { |
| 44 | return v8::FunctionTemplate::New(isolate, |
| 45 | ExternalizeStringExtension::Externalize); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 46 | } else { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 47 | DCHECK(strcmp(*v8::String::Utf8Value(str), "isOneByteString") == 0); |
| 48 | return v8::FunctionTemplate::New(isolate, |
| 49 | ExternalizeStringExtension::IsOneByte); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 50 | } |
| 51 | } |
| 52 | |
| 53 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 54 | void ExternalizeStringExtension::Externalize( |
| 55 | const v8::FunctionCallbackInfo<v8::Value>& args) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 56 | if (args.Length() < 1 || !args[0]->IsString()) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 57 | args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( |
| 58 | args.GetIsolate(), |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 59 | "First parameter to externalizeString() must be a string.")); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 60 | return; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 61 | } |
| 62 | bool force_two_byte = false; |
| 63 | if (args.Length() >= 2) { |
| 64 | if (args[1]->IsBoolean()) { |
| 65 | force_two_byte = args[1]->BooleanValue(); |
| 66 | } else { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 67 | args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( |
| 68 | args.GetIsolate(), |
| 69 | "Second parameter to externalizeString() must be a boolean.")); |
| 70 | return; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 71 | } |
| 72 | } |
| 73 | bool result = false; |
| 74 | Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>()); |
| 75 | if (string->IsExternalString()) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 76 | args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( |
| 77 | args.GetIsolate(), |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 78 | "externalizeString() can't externalize twice.")); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 79 | return; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 80 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 81 | if (string->IsOneByteRepresentation() && !force_two_byte) { |
| 82 | uint8_t* data = new uint8_t[string->length()]; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 83 | String::WriteToFlat(*string, data, 0, string->length()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 84 | SimpleOneByteStringResource* resource = new SimpleOneByteStringResource( |
| 85 | reinterpret_cast<char*>(data), string->length()); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 86 | result = string->MakeExternal(resource); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 87 | if (result) { |
| 88 | i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); |
| 89 | isolate->heap()->external_string_table()->AddString(*string); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 90 | } |
| 91 | if (!result) delete resource; |
| 92 | } else { |
| 93 | uc16* data = new uc16[string->length()]; |
| 94 | String::WriteToFlat(*string, data, 0, string->length()); |
| 95 | SimpleTwoByteStringResource* resource = new SimpleTwoByteStringResource( |
| 96 | data, string->length()); |
| 97 | result = string->MakeExternal(resource); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 98 | if (result) { |
| 99 | i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); |
| 100 | isolate->heap()->external_string_table()->AddString(*string); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 101 | } |
| 102 | if (!result) delete resource; |
| 103 | } |
| 104 | if (!result) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 105 | args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( |
| 106 | args.GetIsolate(), "externalizeString() failed.")); |
| 107 | return; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 108 | } |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 112 | void ExternalizeStringExtension::IsOneByte( |
| 113 | const v8::FunctionCallbackInfo<v8::Value>& args) { |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 114 | if (args.Length() != 1 || !args[0]->IsString()) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 115 | args.GetIsolate()->ThrowException(v8::String::NewFromUtf8( |
| 116 | args.GetIsolate(), |
| 117 | "isOneByteString() requires a single string argument.")); |
| 118 | return; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 119 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 120 | bool is_one_byte = |
| 121 | Utils::OpenHandle(*args[0].As<v8::String>())->IsOneByteRepresentation(); |
| 122 | args.GetReturnValue().Set(is_one_byte); |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | } } // namespace v8::internal |