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v8-source-location.h2.7 KB · 98 lines
// Copyright 2020 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. #ifndef INCLUDE_SOURCE_LOCATION_H_#define INCLUDE_SOURCE_LOCATION_H_ #include <cstddef>#include <string> #include "v8config.h"  // NOLINT(build/include_directory) #if defined(__has_builtin)#define V8_SUPPORTS_SOURCE_LOCATION                                      \  (__has_builtin(__builtin_FUNCTION) && __has_builtin(__builtin_FILE) && \   __has_builtin(__builtin_LINE))  // NOLINT#elif defined(V8_CC_GNU) && __GNUC__ >= 7#define V8_SUPPORTS_SOURCE_LOCATION 1#elif defined(V8_CC_INTEL) && __ICC >= 1800#define V8_SUPPORTS_SOURCE_LOCATION 1#else#define V8_SUPPORTS_SOURCE_LOCATION 0#endif namespace v8 { /** * Encapsulates source location information. Mimics C++20's * `std::source_location`. */class V8_EXPORT SourceLocation final { public:  /**   * Construct source location information corresponding to the location of the   * call site.   */#if V8_SUPPORTS_SOURCE_LOCATION  static constexpr SourceLocation Current(      const char* function = __builtin_FUNCTION(),      const char* file = __builtin_FILE(), size_t line = __builtin_LINE()) {    return SourceLocation(function, file, line);  }#else  static constexpr SourceLocation Current() { return SourceLocation(); }#endif  // V8_SUPPORTS_SOURCE_LOCATION   /**   * Constructs unspecified source location information.   */  constexpr SourceLocation() = default;   /**   * Returns the name of the function associated with the position represented   * by this object, if any.   *   * \returns the function name as cstring.   */  constexpr const char* Function() const { return function_; }   /**   * Returns the name of the current source file represented by this object.   *   * \returns the file name as cstring.   */  constexpr const char* FileName() const { return file_; }   /**   * Returns the line number represented by this object.   *   * \returns the line number.   */  constexpr size_t Line() const { return line_; }   /**   * Returns a human-readable string representing this object.   *   * \returns a human-readable string representing source location information.   */  std::string ToString() const {    if (!file_) {      return {};    }    return std::string(function_) + "@" + file_ + ":" + std::to_string(line_);  }  private:  constexpr SourceLocation(const char* function, const char* file, size_t line)      : function_(function), file_(file), line_(line) {}   const char* function_ = nullptr;  const char* file_ = nullptr;  size_t line_ = 0u;}; }  // namespace v8 #endif  // INCLUDE_SOURCE_LOCATION_H_