1 // Copyright 2016 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 #ifndef V8_UTILS_INL_H_ 6 #define V8_UTILS_INL_H_ 7 8 #include "src/utils.h" 9 10 #include "include/v8-platform.h" 11 #include "src/base/platform/time.h" 12 #include "src/char-predicates-inl.h" 13 #include "src/v8.h" 14 15 namespace v8 { 16 namespace internal { 17 18 class TimedScope { 19 public: 20 explicit TimedScope(double* result) 21 : start_(TimestampMs()), result_(result) {} 22 23 ~TimedScope() { *result_ = TimestampMs() - start_; } 24 25 private: 26 static inline double TimestampMs() { 27 return V8::GetCurrentPlatform()->MonotonicallyIncreasingTime() * 28 static_cast<double>(base::Time::kMillisecondsPerSecond); 29 } 30 31 double start_; 32 double* result_; 33 }; 34 35 template <typename Stream> 36 bool StringToArrayIndex(Stream* stream, uint32_t* index) { 37 uint16_t ch = stream->GetNext(); 38 39 // If the string begins with a '0' character, it must only consist 40 // of it to be a legal array index. 41 if (ch == '0') { 42 *index = 0; 43 return !stream->HasMore(); 44 } 45 46 // Convert string to uint32 array index; character by character. 47 if (!IsDecimalDigit(ch)) return false; 48 int d = ch - '0'; 49 uint32_t result = d; 50 while (stream->HasMore()) { 51 ch = stream->GetNext(); 52 if (!IsDecimalDigit(ch)) return false; 53 d = ch - '0'; 54 // Check that the new result is below the 32 bit limit. 55 if (result > 429496729U - ((d + 3) >> 3)) return false; 56 result = (result * 10) + d; 57 } 58 59 *index = result; 60 return true; 61 } 62 63 } // namespace internal 64 } // namespace v8 65 66 #endif // V8_UTILS_INL_H_ 67
