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