LCOV - code coverage report
Current view: top level - src/extensions - externalize-string-extension.cc (source / functions) Hit Total Coverage
Test: app.info Lines: 35 43 81.4 %
Date: 2017-04-26 Functions: 7 11 63.6 %

          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.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         827 :         length_(length) {}
      22             : 
      23        1654 :   virtual ~SimpleStringResource() { delete[] data_; }
      24             : 
      25       13960 :   virtual const Char* data() const { return data_; }
      26             : 
      27           0 :   virtual size_t length() const { 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         126 : ExternalizeStringExtension::GetNativeFunctionTemplate(
      47             :     v8::Isolate* isolate, v8::Local<v8::String> str) {
      48         126 :   if (strcmp(*v8::String::Utf8Value(str), "externalizeString") == 0) {
      49             :     return v8::FunctionTemplate::New(isolate,
      50          63 :                                      ExternalizeStringExtension::Externalize);
      51             :   } else {
      52             :     DCHECK(strcmp(*v8::String::Utf8Value(str), "isOneByteString") == 0);
      53             :     return v8::FunctionTemplate::New(isolate,
      54          63 :                                      ExternalizeStringExtension::IsOneByte);
      55             :   }
      56             : }
      57             : 
      58             : 
      59        1415 : void ExternalizeStringExtension::Externalize(
      60        4668 :     const v8::FunctionCallbackInfo<v8::Value>& args) {
      61        2830 :   if (args.Length() < 1 || !args[0]->IsString()) {
      62             :     args.GetIsolate()->ThrowException(
      63             :         v8::String::NewFromUtf8(
      64             :             args.GetIsolate(),
      65             :             "First parameter to externalizeString() must be a string.",
      66           0 :             NewStringType::kNormal).ToLocalChecked());
      67           0 :     return;
      68             :   }
      69             :   bool force_two_byte = false;
      70        1415 :   if (args.Length() >= 2) {
      71        1250 :     if (args[1]->IsBoolean()) {
      72             :       force_two_byte =
      73             :           args[1]
      74        1250 :               ->BooleanValue(args.GetIsolate()->GetCurrentContext())
      75        2500 :               .FromJust();
      76             :     } else {
      77             :       args.GetIsolate()->ThrowException(
      78             :           v8::String::NewFromUtf8(
      79             :               args.GetIsolate(),
      80             :               "Second parameter to externalizeString() must be a boolean.",
      81           0 :               NewStringType::kNormal).ToLocalChecked());
      82           0 :       return;
      83             :     }
      84             :   }
      85             :   bool result = false;
      86             :   Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>());
      87        1415 :   if (string->IsExternalString()) {
      88             :     args.GetIsolate()->ThrowException(
      89             :         v8::String::NewFromUtf8(args.GetIsolate(),
      90             :                                 "externalizeString() can't externalize twice.",
      91        1176 :                                 NewStringType::kNormal).ToLocalChecked());
      92         588 :     return;
      93             :   }
      94         827 :   if (string->IsOneByteRepresentation() && !force_two_byte) {
      95         403 :     uint8_t* data = new uint8_t[string->length()];
      96         403 :     String::WriteToFlat(*string, data, 0, string->length());
      97             :     SimpleOneByteStringResource* resource = new SimpleOneByteStringResource(
      98         403 :         reinterpret_cast<char*>(data), string->length());
      99         403 :     result = string->MakeExternal(resource);
     100         403 :     if (result) {
     101             :       i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
     102             :       isolate->heap()->RegisterExternalString(*string);
     103             :     }
     104         403 :     if (!result) delete resource;
     105             :   } else {
     106         424 :     uc16* data = new uc16[string->length()];
     107         424 :     String::WriteToFlat(*string, data, 0, string->length());
     108             :     SimpleTwoByteStringResource* resource = new SimpleTwoByteStringResource(
     109         424 :         data, string->length());
     110         424 :     result = string->MakeExternal(resource);
     111         424 :     if (result) {
     112             :       i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
     113             :       isolate->heap()->RegisterExternalString(*string);
     114             :     }
     115         424 :     if (!result) delete resource;
     116             :   }
     117         827 :   if (!result) {
     118             :     args.GetIsolate()->ThrowException(
     119             :         v8::String::NewFromUtf8(args.GetIsolate(),
     120             :                                 "externalizeString() failed.",
     121           0 :                                 NewStringType::kNormal).ToLocalChecked());
     122           0 :     return;
     123             :   }
     124             : }
     125             : 
     126             : 
     127        2280 : void ExternalizeStringExtension::IsOneByte(
     128        4560 :     const v8::FunctionCallbackInfo<v8::Value>& args) {
     129        4560 :   if (args.Length() != 1 || !args[0]->IsString()) {
     130             :     args.GetIsolate()->ThrowException(
     131             :         v8::String::NewFromUtf8(
     132             :             args.GetIsolate(),
     133             :             "isOneByteString() requires a single string argument.",
     134           0 :             NewStringType::kNormal).ToLocalChecked());
     135        2280 :     return;
     136             :   }
     137             :   bool is_one_byte =
     138             :       Utils::OpenHandle(*args[0].As<v8::String>())->IsOneByteRepresentation();
     139             :   args.GetReturnValue().Set(is_one_byte);
     140             : }
     141             : 
     142             : }  // namespace internal
     143             : }  // namespace v8

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