InstallArea/include/ers/ers/Context.h

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/*
 *  Context.h
 *  ers
 *
 *  Created by Matthias Wiesmann on 26.11.04.
 *  Copyright 2004 CERN. All rights reserved.
 *
 */
 
#ifndef ERS_CONTEXT_
#define ERS_CONTEXT_
 
/** \file Context.h
  * This file defines the ers::Context object, and the associated macros, like ERS_HERE.
  */ 
 
#include <string>
#include <vector>
 
namespace ers {
    
 
/** This class encapsulates Context information for an issue.
  * The context of an issue is the location in the code the issue was constructed. 
  * The context acts as an encapsulator for compilator generted information like:
  * - source file
  * - source line
  * - function name
  * - compilation date and time
  * - compilator type 
  *
  * The current context can be obtained using the macro \c ERS_HERE
  * An empty context can be obtained using the macro \c ERS_EMPTY
  *
  * \author Matthias Wiesmann
  * \version 1.1 - now returns references 
  * \brief Source context for Issue. 
  * \note it should be possible to optimize out the compilation text string, have only one default instance if 
  *       all the code share the same info. This would save some memory space. 
  */
 
class Context {
protected:
    static Context* empty_instance ; 
    static std::string s_host_type ;   /**< host_type */
    static std::vector<std::string>    default_qualifiers ; /**< vector of default qualifiers */ 
    std::string m_file_name ;          /**< source file-name */
    int m_line_number ;                /**< source line-number */
    std::string m_function_name ;      /**< source function name (can be pretty printed or not) */
    std::string m_compiler_name ;      /**< compiler name */
    std::string m_compiler_version ;   /**< compiler version */
    std::string m_compilation_date ;   /**< compilation date */
    std::string m_compilation_time ;   /**< compilation time */
    std::string m_package_name ; 
    mutable std::string m_compiler ;   /**< compilation string (cache) */
    mutable std::string m_position ;   /**< code position (cache) */
    mutable std::string m_compilation ; /**< compilation (cache) */
    std::vector<std::string> m_stack_frames ; /** stack frames */
    static void build_host_type() ;
public:
    static const Context* empty() ;
    static std::string & host_type()  ; /**< \brief type of target host */
    static int debug_level(); 
    static void add_qualifier(const std::string &qualif) ;
    Context(const std::string &filename, int line_number, const std::string &function_name, 
        const std::string &compiler_name, const std::string &compiler_version, 
        const std::string &compilation_time, const std::string &compilation_date, const std::string &package) ;
    const std::string & file() const throw();         /**< \return file-name */
    int line() const throw() ;                  /**< \return line-number */
    const std::string & function() const throw() ;    /**< \return function name */
    const std::string & position() const ;            /**< \return position (i.e file+line+function) */
    const std::string & compiler() const ;            /**< \return compiler (compiler-name + compiler-version) */
    const std::string & compilation() const ;         /**< \return compilation time and date */
    const std::string & package_name() const throw(); /**< \return package name (if defined by CMT) */
    int stack_frames() const throw() ;                /**< \return number of stack frames */
    const std::string &stack_frame(int i) const ;     /**< \return stack frame with index */
    std::vector<std::string> qualifiers() const throw() ; /**< \return array of qualifiers */
   } ; // Context
 
} // ers 
 
/** \def COMPILER_NAME defines the name of the compiler used */
/** \def __VERSION__ defines the version of the compiler used */
 
#ifdef __GNUC__
#define COMPILER_NAME "gcc"
#endif
 
#ifdef __INTEL_COMPILER
#define COMPILER_NAME "icc" 
#endif
 
#ifndef COMPILER_NAME
#define COMPILER_NAME "unknown"
#endif
 
#ifndef __VERSION__
#define __VERSION__ "unknown"
#endif
 
#ifdef TDAQ_PACKAGE_NAME
#define ERS_PACK TDAQ_PACKAGE_NAME
#else
#define ERS_PACK ""
#endif
 
/** \def ERS_EMPTY macro to an empty context object used when no context is available */
#define ERS_EMPTY *(ers::Context::empty()) 
 
/** \def ERS_HERE This macro constructs a context object with all the current values 
  * If gnuc is present, we use the pretty function name instead of the standard __func__ name.
  * If macro \c N_DEBUG is defined, an empty context is substituted. 
  */ 
 
#ifndef N_DEBUG
#ifdef __GNUC__
#define ERS_HERE ers::Context(__FILE__,__LINE__,__PRETTY_FUNCTION__,COMPILER_NAME,__VERSION__,__TIME__,__DATE__,ERS_PACK)
#else
#define ERS_HERE ers::Context(__FILE__,__LINE__,__func__,COMPILER_NAME,__VERSION__,__TIME__,__DATE__,ERS_PACK)
#endif
#else
#define ERS_HERE ERS_EMPTY
#endif
 
 
 
#endif