1 // Copyright 2014 The PDFium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include "fxjs/xfa/cfxjse_value.h"
8
9 #include <math.h>
10
11 #include "fxjs/fxv8.h"
12 #include "fxjs/xfa/cfxjse_class.h"
13 #include "fxjs/xfa/cfxjse_context.h"
14 #include "fxjs/xfa/cfxjse_isolatetracker.h"
15 #include "third_party/base/check.h"
16 #include "v8/include/v8-container.h"
17 #include "v8/include/v8-exception.h"
18 #include "v8/include/v8-function.h"
19 #include "v8/include/v8-primitive.h"
20 #include "v8/include/v8-script.h"
21
22 namespace {
23
ftod(float fNumber)24 double ftod(float fNumber) {
25 static_assert(sizeof(float) == 4, "float of incorrect size");
26
27 uint32_t nFloatBits = (uint32_t&)fNumber;
28 uint8_t nExponent = (uint8_t)(nFloatBits >> 23);
29 if (nExponent == 0 || nExponent == 255)
30 return fNumber;
31
32 int8_t nErrExp = nExponent - 150;
33 if (nErrExp >= 0)
34 return fNumber;
35
36 double dwError = pow(2.0, nErrExp);
37 double dwErrorHalf = dwError / 2;
38 double dNumber = fNumber;
39 double dNumberAbs = fabs(fNumber);
40 double dNumberAbsMin = dNumberAbs - dwErrorHalf;
41 double dNumberAbsMax = dNumberAbs + dwErrorHalf;
42 int32_t iErrPos = 0;
43 if (floor(dNumberAbsMin) == floor(dNumberAbsMax)) {
44 dNumberAbsMin = fmod(dNumberAbsMin, 1.0);
45 dNumberAbsMax = fmod(dNumberAbsMax, 1.0);
46 int32_t iErrPosMin = 1;
47 int32_t iErrPosMax = 38;
48 do {
49 int32_t iMid = (iErrPosMin + iErrPosMax) / 2;
50 double dPow = pow(10.0, iMid);
51 if (floor(dNumberAbsMin * dPow) == floor(dNumberAbsMax * dPow)) {
52 iErrPosMin = iMid + 1;
53 } else {
54 iErrPosMax = iMid;
55 }
56 } while (iErrPosMin < iErrPosMax);
57 iErrPos = iErrPosMax;
58 }
59 double dPow = pow(10.0, iErrPos);
60 return fNumber < 0 ? ceil(dNumber * dPow - 0.5) / dPow
61 : floor(dNumber * dPow + 0.5) / dPow;
62 }
63
64 } // namespace
65
FXJSE_ThrowMessage(v8::Isolate * pIsolate,ByteStringView utf8Message)66 void FXJSE_ThrowMessage(v8::Isolate* pIsolate, ByteStringView utf8Message) {
67 DCHECK(pIsolate);
68 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
69 v8::Local<v8::String> hMessage = fxv8::NewStringHelper(pIsolate, utf8Message);
70 v8::Local<v8::Value> hError = v8::Exception::Error(hMessage);
71 pIsolate->ThrowException(hError);
72 }
73
74 CFXJSE_Value::CFXJSE_Value() = default;
75
CFXJSE_Value(v8::Isolate * pIsolate,v8::Local<v8::Value> value)76 CFXJSE_Value::CFXJSE_Value(v8::Isolate* pIsolate, v8::Local<v8::Value> value) {
77 ForceSetValue(pIsolate, value);
78 }
79
80 CFXJSE_Value::~CFXJSE_Value() = default;
81
ToHostObject(v8::Isolate * pIsolate) const82 CFXJSE_HostObject* CFXJSE_Value::ToHostObject(v8::Isolate* pIsolate) const {
83 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
84 return CFXJSE_HostObject::FromV8(
85 v8::Local<v8::Value>::New(pIsolate, m_hValue));
86 }
87
SetHostObject(v8::Isolate * pIsolate,CFXJSE_HostObject * pObject,CFXJSE_Class * pClass)88 void CFXJSE_Value::SetHostObject(v8::Isolate* pIsolate,
89 CFXJSE_HostObject* pObject,
90 CFXJSE_Class* pClass) {
91 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
92 m_hValue.Reset(pIsolate, pObject->NewBoundV8Object(
93 pIsolate, pClass->GetTemplate(pIsolate)));
94 }
95
SetArray(v8::Isolate * pIsolate,const std::vector<std::unique_ptr<CFXJSE_Value>> & values)96 void CFXJSE_Value::SetArray(
97 v8::Isolate* pIsolate,
98 const std::vector<std::unique_ptr<CFXJSE_Value>>& values) {
99 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
100 std::vector<v8::Local<v8::Value>> local_values;
101 local_values.reserve(values.size());
102 for (auto& v : values) {
103 if (v->IsEmpty())
104 local_values.push_back(fxv8::NewUndefinedHelper(pIsolate));
105 else
106 local_values.push_back(v->GetValue(pIsolate));
107 }
108 v8::Local<v8::Array> hArrayObject =
109 v8::Array::New(pIsolate, local_values.data(), local_values.size());
110 m_hValue.Reset(pIsolate, hArrayObject);
111 }
112
SetFloat(v8::Isolate * pIsolate,float fFloat)113 void CFXJSE_Value::SetFloat(v8::Isolate* pIsolate, float fFloat) {
114 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
115 m_hValue.Reset(pIsolate, fxv8::NewNumberHelper(pIsolate, ftod(fFloat)));
116 }
117
SetObjectProperty(v8::Isolate * pIsolate,ByteStringView szPropName,CFXJSE_Value * pPropValue)118 bool CFXJSE_Value::SetObjectProperty(v8::Isolate* pIsolate,
119 ByteStringView szPropName,
120 CFXJSE_Value* pPropValue) {
121 if (pPropValue->IsEmpty())
122 return false;
123
124 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
125 v8::Local<v8::Value> hObject = GetValue(pIsolate);
126 if (!hObject->IsObject())
127 return false;
128
129 return fxv8::ReentrantPutObjectPropertyHelper(
130 pIsolate, hObject.As<v8::Object>(), szPropName,
131 pPropValue->GetValue(pIsolate));
132 }
133
GetObjectProperty(v8::Isolate * pIsolate,ByteStringView szPropName,CFXJSE_Value * pPropValue)134 bool CFXJSE_Value::GetObjectProperty(v8::Isolate* pIsolate,
135 ByteStringView szPropName,
136 CFXJSE_Value* pPropValue) {
137 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
138 v8::Local<v8::Value> hObject = GetValue(pIsolate);
139 if (!hObject->IsObject())
140 return false;
141
142 pPropValue->ForceSetValue(
143 pIsolate, fxv8::ReentrantGetObjectPropertyHelper(
144 pIsolate, hObject.As<v8::Object>(), szPropName));
145 return true;
146 }
147
GetObjectPropertyByIdx(v8::Isolate * pIsolate,uint32_t uPropIdx,CFXJSE_Value * pPropValue)148 bool CFXJSE_Value::GetObjectPropertyByIdx(v8::Isolate* pIsolate,
149 uint32_t uPropIdx,
150 CFXJSE_Value* pPropValue) {
151 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
152 v8::Local<v8::Value> hObject = GetValue(pIsolate);
153 if (!hObject->IsArray())
154 return false;
155
156 pPropValue->ForceSetValue(pIsolate,
157 fxv8::ReentrantGetArrayElementHelper(
158 pIsolate, hObject.As<v8::Array>(), uPropIdx));
159 return true;
160 }
161
DeleteObjectProperty(v8::Isolate * pIsolate,ByteStringView szPropName)162 void CFXJSE_Value::DeleteObjectProperty(v8::Isolate* pIsolate,
163 ByteStringView szPropName) {
164 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
165 v8::Local<v8::Value> hObject = v8::Local<v8::Value>::New(pIsolate, m_hValue);
166 if (hObject->IsObject()) {
167 fxv8::ReentrantDeleteObjectPropertyHelper(
168 pIsolate, hObject.As<v8::Object>(), szPropName);
169 }
170 }
171
SetObjectOwnProperty(v8::Isolate * pIsolate,ByteStringView szPropName,CFXJSE_Value * pPropValue)172 bool CFXJSE_Value::SetObjectOwnProperty(v8::Isolate* pIsolate,
173 ByteStringView szPropName,
174 CFXJSE_Value* pPropValue) {
175 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
176 v8::Local<v8::Value> hObject = v8::Local<v8::Value>::New(pIsolate, m_hValue);
177 if (!hObject->IsObject())
178 return false;
179
180 v8::Local<v8::Value> pValue =
181 v8::Local<v8::Value>::New(pIsolate, pPropValue->m_hValue);
182 return fxv8::ReentrantSetObjectOwnPropertyHelper(
183 pIsolate, hObject.As<v8::Object>(), szPropName, pValue);
184 }
185
NewBoundFunction(v8::Isolate * pIsolate,v8::Local<v8::Function> hOldFunction,v8::Local<v8::Object> hNewThis)186 v8::Local<v8::Function> CFXJSE_Value::NewBoundFunction(
187 v8::Isolate* pIsolate,
188 v8::Local<v8::Function> hOldFunction,
189 v8::Local<v8::Object> hNewThis) {
190 DCHECK(!hOldFunction.IsEmpty());
191 DCHECK(!hNewThis.IsEmpty());
192
193 CFXJSE_ScopeUtil_RootContext scope(pIsolate);
194 v8::Local<v8::Value> rgArgs[2];
195 rgArgs[0] = hOldFunction;
196 rgArgs[1] = hNewThis;
197 v8::Local<v8::String> hBinderFuncSource = fxv8::NewStringHelper(
198 pIsolate, "(function (fn, obj) { return fn.bind(obj); })");
199 v8::Local<v8::Context> hContext = pIsolate->GetCurrentContext();
200 v8::Local<v8::Function> hBinderFunc =
201 v8::Script::Compile(hContext, hBinderFuncSource)
202 .ToLocalChecked()
203 ->Run(hContext)
204 .ToLocalChecked()
205 .As<v8::Function>();
206 v8::Local<v8::Value> hBoundFunction =
207 hBinderFunc->Call(hContext, hContext->Global(), 2, rgArgs)
208 .ToLocalChecked();
209 if (!fxv8::IsFunction(hBoundFunction))
210 return v8::Local<v8::Function>();
211
212 return hBoundFunction.As<v8::Function>();
213 }
214
GetValue(v8::Isolate * pIsolate) const215 v8::Local<v8::Value> CFXJSE_Value::GetValue(v8::Isolate* pIsolate) const {
216 return v8::Local<v8::Value>::New(pIsolate, m_hValue);
217 }
218
IsEmpty() const219 bool CFXJSE_Value::IsEmpty() const {
220 return m_hValue.IsEmpty();
221 }
222
IsUndefined(v8::Isolate * pIsolate) const223 bool CFXJSE_Value::IsUndefined(v8::Isolate* pIsolate) const {
224 if (IsEmpty())
225 return false;
226
227 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
228 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
229 return hValue->IsUndefined();
230 }
231
IsNull(v8::Isolate * pIsolate) const232 bool CFXJSE_Value::IsNull(v8::Isolate* pIsolate) const {
233 if (IsEmpty())
234 return false;
235
236 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
237 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
238 return hValue->IsNull();
239 }
240
IsBoolean(v8::Isolate * pIsolate) const241 bool CFXJSE_Value::IsBoolean(v8::Isolate* pIsolate) const {
242 if (IsEmpty())
243 return false;
244
245 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
246 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
247 return hValue->IsBoolean();
248 }
249
IsString(v8::Isolate * pIsolate) const250 bool CFXJSE_Value::IsString(v8::Isolate* pIsolate) const {
251 if (IsEmpty())
252 return false;
253
254 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
255 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
256 return hValue->IsString();
257 }
258
IsNumber(v8::Isolate * pIsolate) const259 bool CFXJSE_Value::IsNumber(v8::Isolate* pIsolate) const {
260 if (IsEmpty())
261 return false;
262
263 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
264 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
265 return hValue->IsNumber();
266 }
267
IsInteger(v8::Isolate * pIsolate) const268 bool CFXJSE_Value::IsInteger(v8::Isolate* pIsolate) const {
269 if (IsEmpty())
270 return false;
271
272 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
273 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
274 return hValue->IsInt32();
275 }
276
IsObject(v8::Isolate * pIsolate) const277 bool CFXJSE_Value::IsObject(v8::Isolate* pIsolate) const {
278 if (IsEmpty())
279 return false;
280
281 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
282 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
283 return hValue->IsObject();
284 }
285
IsArray(v8::Isolate * pIsolate) const286 bool CFXJSE_Value::IsArray(v8::Isolate* pIsolate) const {
287 if (IsEmpty())
288 return false;
289
290 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
291 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
292 return hValue->IsArray();
293 }
294
IsFunction(v8::Isolate * pIsolate) const295 bool CFXJSE_Value::IsFunction(v8::Isolate* pIsolate) const {
296 if (IsEmpty())
297 return false;
298
299 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
300 v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(pIsolate, m_hValue);
301 return hValue->IsFunction();
302 }
303
ToBoolean(v8::Isolate * pIsolate) const304 bool CFXJSE_Value::ToBoolean(v8::Isolate* pIsolate) const {
305 DCHECK(!IsEmpty());
306 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
307 return fxv8::ReentrantToBooleanHelper(
308 pIsolate, v8::Local<v8::Value>::New(pIsolate, m_hValue));
309 }
310
ToFloat(v8::Isolate * pIsolate) const311 float CFXJSE_Value::ToFloat(v8::Isolate* pIsolate) const {
312 return static_cast<float>(ToDouble(pIsolate));
313 }
314
ToDouble(v8::Isolate * pIsolate) const315 double CFXJSE_Value::ToDouble(v8::Isolate* pIsolate) const {
316 DCHECK(!IsEmpty());
317 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
318 return fxv8::ReentrantToDoubleHelper(
319 pIsolate, v8::Local<v8::Value>::New(pIsolate, m_hValue));
320 }
321
ToInteger(v8::Isolate * pIsolate) const322 int32_t CFXJSE_Value::ToInteger(v8::Isolate* pIsolate) const {
323 DCHECK(!IsEmpty());
324 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
325 return fxv8::ReentrantToInt32Helper(
326 pIsolate, v8::Local<v8::Value>::New(pIsolate, m_hValue));
327 }
328
ToString(v8::Isolate * pIsolate) const329 ByteString CFXJSE_Value::ToString(v8::Isolate* pIsolate) const {
330 DCHECK(!IsEmpty());
331 CFXJSE_ScopeUtil_IsolateHandleRootContext scope(pIsolate);
332 return fxv8::ReentrantToByteStringHelper(
333 pIsolate, v8::Local<v8::Value>::New(pIsolate, m_hValue));
334 }
335
SetUndefined(v8::Isolate * pIsolate)336 void CFXJSE_Value::SetUndefined(v8::Isolate* pIsolate) {
337 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
338 m_hValue.Reset(pIsolate, fxv8::NewUndefinedHelper(pIsolate));
339 }
340
SetNull(v8::Isolate * pIsolate)341 void CFXJSE_Value::SetNull(v8::Isolate* pIsolate) {
342 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
343 m_hValue.Reset(pIsolate, fxv8::NewNullHelper(pIsolate));
344 }
345
SetBoolean(v8::Isolate * pIsolate,bool bBoolean)346 void CFXJSE_Value::SetBoolean(v8::Isolate* pIsolate, bool bBoolean) {
347 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
348 m_hValue.Reset(pIsolate, fxv8::NewBooleanHelper(pIsolate, bBoolean));
349 }
350
SetInteger(v8::Isolate * pIsolate,int32_t nInteger)351 void CFXJSE_Value::SetInteger(v8::Isolate* pIsolate, int32_t nInteger) {
352 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
353 m_hValue.Reset(pIsolate, fxv8::NewNumberHelper(pIsolate, nInteger));
354 }
355
SetDouble(v8::Isolate * pIsolate,double dDouble)356 void CFXJSE_Value::SetDouble(v8::Isolate* pIsolate, double dDouble) {
357 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
358 m_hValue.Reset(pIsolate, fxv8::NewNumberHelper(pIsolate, dDouble));
359 }
360
SetString(v8::Isolate * pIsolate,ByteStringView szString)361 void CFXJSE_Value::SetString(v8::Isolate* pIsolate, ByteStringView szString) {
362 CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
363 m_hValue.Reset(pIsolate, fxv8::NewStringHelper(pIsolate, szString));
364 }
365