LCOV - code coverage report
Current view: top level - src/extensions - externalize-string-extension.cc (source / functions) Hit Total Coverage
Test: app.info Lines: 33 45 73.3 %
Date: 2019-03-21 Functions: 10 12 83.3 %

          Line data    Source code
       1             : // Copyright 2010 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include "src/extensions/externalize-string-extension.h"
       6             : 
       7             : #include "src/api-inl.h"
       8             : #include "src/handles.h"
       9             : #include "src/isolate.h"
      10             : #include "src/objects-inl.h"
      11             : 
      12             : namespace v8 {
      13             : namespace internal {
      14             : 
      15             : template <typename Char, typename Base>
      16             : class SimpleStringResource : public Base {
      17             :  public:
      18             :   // Takes ownership of |data|.
      19             :   SimpleStringResource(Char* data, size_t length)
      20             :       : data_(data),
      21         508 :         length_(length) {}
      22             : 
      23        1016 :   ~SimpleStringResource() override { delete[] data_; }
      24             : 
      25       11926 :   const Char* data() const override { return data_; }
      26             : 
      27         513 :   size_t length() const override { return length_; }
      28             : 
      29             :  private:
      30             :   Char* const data_;
      31             :   const size_t length_;
      32             : };
      33             : 
      34             : 
      35             : typedef SimpleStringResource<char, v8::String::ExternalOneByteStringResource>
      36             :     SimpleOneByteStringResource;
      37             : typedef SimpleStringResource<uc16, v8::String::ExternalStringResource>
      38             :     SimpleTwoByteStringResource;
      39             : 
      40             : const char* const ExternalizeStringExtension::kSource =
      41             :     "native function externalizeString();"
      42             :     "native function isOneByteString();"
      43             :     "function x() { return 1; }";
      44             : 
      45             : v8::Local<v8::FunctionTemplate>
      46         140 : ExternalizeStringExtension::GetNativeFunctionTemplate(
      47             :     v8::Isolate* isolate, v8::Local<v8::String> str) {
      48         140 :   if (strcmp(*v8::String::Utf8Value(isolate, str), "externalizeString") == 0) {
      49             :     return v8::FunctionTemplate::New(isolate,
      50          70 :                                      ExternalizeStringExtension::Externalize);
      51             :   } else {
      52             :     DCHECK_EQ(strcmp(*v8::String::Utf8Value(isolate, str), "isOneByteString"),
      53             :               0);
      54             :     return v8::FunctionTemplate::New(isolate,
      55          70 :                                      ExternalizeStringExtension::IsOneByte);
      56             :   }
      57             : }
      58             : 
      59             : 
      60         879 : void ExternalizeStringExtension::Externalize(
      61             :     const v8::FunctionCallbackInfo<v8::Value>& args) {
      62        1758 :   if (args.Length() < 1 || !args[0]->IsString()) {
      63             :     args.GetIsolate()->ThrowException(
      64           0 :         v8::String::NewFromUtf8(
      65             :             args.GetIsolate(),
      66             :             "First parameter to externalizeString() must be a string.",
      67           0 :             NewStringType::kNormal).ToLocalChecked());
      68           0 :     return;
      69             :   }
      70             :   bool force_two_byte = false;
      71         879 :   if (args.Length() >= 2) {
      72         780 :     if (args[1]->IsBoolean()) {
      73         780 :       force_two_byte = args[1]->BooleanValue(args.GetIsolate());
      74             :     } else {
      75             :       args.GetIsolate()->ThrowException(
      76           0 :           v8::String::NewFromUtf8(
      77             :               args.GetIsolate(),
      78             :               "Second parameter to externalizeString() must be a boolean.",
      79           0 :               NewStringType::kNormal).ToLocalChecked());
      80           0 :       return;
      81             :     }
      82             :   }
      83             :   bool result = false;
      84             :   Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>());
      85         879 :   if (!string->SupportsExternalization()) {
      86             :     args.GetIsolate()->ThrowException(
      87         371 :         v8::String::NewFromUtf8(args.GetIsolate(),
      88             :                                 "string does not support externalization.",
      89             :                                 NewStringType::kNormal)
      90         371 :             .ToLocalChecked());
      91         371 :     return;
      92             :   }
      93         508 :   if (string->IsOneByteRepresentation() && !force_two_byte) {
      94         244 :     uint8_t* data = new uint8_t[string->length()];
      95         244 :     String::WriteToFlat(*string, data, 0, string->length());
      96             :     SimpleOneByteStringResource* resource = new SimpleOneByteStringResource(
      97         244 :         reinterpret_cast<char*>(data), string->length());
      98         244 :     result = Utils::ToLocal(string)->MakeExternal(resource);
      99         244 :     if (!result) delete resource;
     100             :   } else {
     101         264 :     uc16* data = new uc16[string->length()];
     102         264 :     String::WriteToFlat(*string, data, 0, string->length());
     103             :     SimpleTwoByteStringResource* resource = new SimpleTwoByteStringResource(
     104         264 :         data, string->length());
     105         264 :     result = Utils::ToLocal(string)->MakeExternal(resource);
     106         264 :     if (!result) delete resource;
     107             :   }
     108         508 :   if (!result) {
     109             :     args.GetIsolate()->ThrowException(
     110           0 :         v8::String::NewFromUtf8(args.GetIsolate(),
     111             :                                 "externalizeString() failed.",
     112           0 :                                 NewStringType::kNormal).ToLocalChecked());
     113           0 :     return;
     114             :   }
     115             : }
     116             : 
     117             : 
     118        1530 : void ExternalizeStringExtension::IsOneByte(
     119             :     const v8::FunctionCallbackInfo<v8::Value>& args) {
     120        3060 :   if (args.Length() != 1 || !args[0]->IsString()) {
     121             :     args.GetIsolate()->ThrowException(
     122           0 :         v8::String::NewFromUtf8(
     123             :             args.GetIsolate(),
     124             :             "isOneByteString() requires a single string argument.",
     125           0 :             NewStringType::kNormal).ToLocalChecked());
     126           0 :     return;
     127             :   }
     128             :   bool is_one_byte =
     129        1530 :       Utils::OpenHandle(*args[0].As<v8::String>())->IsOneByteRepresentation();
     130             :   args.GetReturnValue().Set(is_one_byte);
     131             : }
     132             : 
     133             : }  // namespace internal
     134      120216 : }  // namespace v8

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