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externalize-string-extension.cc
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27 
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|.
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>
57 
58 
59 const char* const ExternalizeStringExtension::kSource =
60  "native function externalizeString();"
61  "native function isAsciiString();";
62 
63 
66  if (strcmp(*v8::String::AsciiValue(str), "externalizeString") == 0) {
68  } else {
69  ASSERT(strcmp(*v8::String::AsciiValue(str), "isAsciiString") == 0);
71  }
72 }
73 
74 
76  const v8::Arguments& args) {
77  if (args.Length() < 1 || !args[0]->IsString()) {
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 {
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()) {
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());
100  data, string->length());
101  result = string->MakeExternal(resource);
102  if (result && !string->IsSymbol()) {
103  HEAP->external_string_table()->AddString(*string);
104  }
105  if (!result) delete resource;
106  } else {
107  uc16* data = new uc16[string->length()];
108  String::WriteToFlat(*string, data, 0, string->length());
110  data, string->length());
111  result = string->MakeExternal(resource);
112  if (result && !string->IsSymbol()) {
113  HEAP->external_string_table()->AddString(*string);
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 
125  const v8::Arguments& args) {
126  if (args.Length() != 1 || !args[0]->IsString()) {
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 
136  static ExternalizeStringExtension externalize_extension;
137  static v8::DeclareExtension declaration(&externalize_extension);
138 }
139 
140 } } // namespace v8::internal
static Local< FunctionTemplate > New(InvocationCallback callback=0, Handle< Value > data=Handle< Value >(), Handle< Signature > signature=Handle< Signature >())
Definition: api.cc:951
static v8::Handle< v8::Value > Externalize(const v8::Arguments &args)
Handle< Boolean > V8EXPORT True()
Definition: api.cc:569
static V8EXPORT Local< String > New(const char *data, int length=-1)
Definition: api.cc:4779
#define ASSERT(condition)
Definition: checks.h:270
virtual v8::Handle< v8::FunctionTemplate > GetNativeFunction(v8::Handle< v8::String > name)
int Length() const
Definition: v8.h:4318
Definition: v8.h:105
Handle< Boolean > V8EXPORT False()
Definition: api.cc:579
static v8::Handle< v8::Value > IsAscii(const v8::Arguments &args)
static void WriteToFlat(String *source, sinkchar *sink, int from, int to)
Definition: objects.cc:6891
uint16_t uc16
Definition: globals.h:259
SimpleStringResource< char, v8::String::ExternalAsciiStringResource > SimpleAsciiStringResource
#define HEAP
Definition: isolate.h:1433
Handle< Primitive > V8EXPORT Undefined()
Definition: api.cc:549
Handle< Value > V8EXPORT ThrowException(Handle< Value > exception)
Definition: api.cc:486
SimpleStringResource< uc16, v8::String::ExternalStringResource > SimpleTwoByteStringResource