error_handler.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2014 John Wellbelove
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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******************************************************************************/
 
#ifndef ETL_ERROR_HANDLER_INCLUDED
#define ETL_ERROR_HANDLER_INCLUDED

 
#include "platform.h"
#include "exception.h"
#include "function.h"
#include "nullptr.h"
 
#include <assert.h>
 
#if defined(ETL_LOG_ERRORS) || defined(ETL_IN_UNIT_TEST)
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  class error_handler
  {
  public:
 
    //*************************************************************************
    //*************************************************************************
    struct free_function : public etl::function<void, const etl::exception&>
    {
      explicit free_function(void (*p_function_)(const etl::exception&))
        : etl::function<void, const etl::exception&>(p_function_)
      {
      }
    };
 
    //*************************************************************************
    //*************************************************************************
    template <typename TObject>
    struct member_function : public etl::function<TObject, const etl::exception&>
    {
      member_function(TObject& object_, void(TObject::*p_function_)(const etl::exception&))
        : etl::function<TObject, const etl::exception&>(object_, p_function_)
      {
      }
    };
 
    //*****************************************************************************
    //*****************************************************************************
    static void set_callback(ifunction<const etl::exception&>& f)
    {
      create((void*)(&f), ifunction_stub);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <void(*Method)(const etl::exception&)>
    static void set_callback()
    {
      create(ETL_NULLPTR, function_stub<Method>);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, void(T::* Method)(const etl::exception&)>
    static void set_callback(T& instance)
    {
      create((void*)(&instance), method_stub<T, Method>);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, void(T::* Method)(const etl::exception&) const>
    static void set_callback(const T& instance)
    {
      create((void*)(&instance), const_method_stub<T, Method>);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, T& Instance, void(T::* Method)(const etl::exception&)>
    static void set_callback()
    {
      create(method_instance_stub<T, Instance, Method>);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, T const& Instance, void(T::* Method)(const etl::exception&) const>
    static void set_callback()
    {
      create(const_method_instance_stub<T, Instance, Method>);
    }
 
    //*****************************************************************************
    //*****************************************************************************
    static void error(const etl::exception& e)
    {
      invocation_element& invocation = get_invocation_element();
 
      if (invocation.stub != ETL_NULLPTR)
      {
        (*invocation.stub)(invocation.object, e);
      }
    }
 
  private:
 
    typedef void(*stub_type)(void* object, const etl::exception&);
 
    //*************************************************************************
    //*************************************************************************
    struct invocation_element
    {
      //***********************************************************************
      invocation_element()
        : object(ETL_NULLPTR)
        , stub(ETL_NULLPTR)
      {
      }
 
      //***********************************************************************
      void* object;
      stub_type stub;
    };
 
    //*************************************************************************
    //*************************************************************************
    static invocation_element& get_invocation_element()
    {
      static invocation_element invocation;
 
      return invocation;
    }
 
    //*************************************************************************
    //*************************************************************************
    static void create(void* object, stub_type stub)
    {
      invocation_element& invocation = get_invocation_element();
 
      invocation.object = object;
      invocation.stub   = stub;
    }
 
    //*************************************************************************
    //*************************************************************************
    static void create(stub_type stub)
    {
      invocation_element& invocation = get_invocation_element();
 
      invocation.object = ETL_NULLPTR;
      invocation.stub   = stub;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, void(T::* Method)(const etl::exception&)>
    static void method_stub(void* object, const etl::exception& e)
    {
      T* p = static_cast<T*>(object);
      return (p->*Method)(e);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, void(T::* Method)(const etl::exception&) const>
    static void const_method_stub(void* object, const etl::exception& e)
    {
      T* const p = static_cast<T*>(object);
      return (p->*Method)(e);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, T& Instance, void(T::* Method)(const etl::exception&)>
    static void method_instance_stub(void*, const etl::exception& e)
    {
      return (Instance.*Method)(e);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename T, const T& Instance, void(T::* Method)(const etl::exception&) const>
    static void const_method_instance_stub(void*, const etl::exception& e)
    {
      (Instance.*Method)(e);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <void(*Method)(const etl::exception&)>
    static void function_stub(void*, const etl::exception& e)
    {
      (Method)(e);
    }
 
    //*************************************************************************
    //*************************************************************************
    static void ifunction_stub(void* object, const etl::exception& e)
    {
      etl::ifunction<const etl::exception&>* p = static_cast<etl::ifunction<const etl::exception&>*>(object);
      p->operator()(e);
    }
  };
}
#elif defined(ETL_USE_ASSERT_FUNCTION)
namespace etl
{
  namespace private_error_handler
  {
    typedef void(*assert_function_ptr_t)(const etl::exception&);
 
    // Stores the assert function pointer and default assert function.
    template <size_t Index>
    struct assert_handler
    {
      static assert_function_ptr_t assert_function_ptr;
 
      static void default_assert(const etl::exception&)
      {
        assert(false);
      }
    };
 
    template <size_t Index>
    assert_function_ptr_t assert_handler<Index>::assert_function_ptr = assert_handler<Index>::default_assert;
  }
 
  //***************************************************************************
  //***************************************************************************
  inline void set_assert_function(etl::private_error_handler::assert_function_ptr_t afptr)
  {
    etl::private_error_handler::assert_handler<0>::assert_function_ptr = afptr;
  }
}
#endif
 
//***************************************************************************
//***************************************************************************
#if defined(ETL_NO_CHECKS)
  #define ETL_ASSERT(b, e) static_cast<void>(sizeof(b))                       // Does nothing.
  #define ETL_ASSERT_OR_RETURN(b, e) static_cast<void>(sizeof(b))             // Does nothing.
  #define ETL_ASSERT_OR_RETURN_VALUE(b, e, v) static_cast<void>(sizeof(b))    // Does nothing.
  
  #define ETL_ASSERT_FAIL(e) static_cast<void>(sizeof(b))                     // Does nothing.
  #define ETL_ASSERT_FAIL_AND_RETURN(e) static_cast<void>(sizeof(b))          // Does nothing.
  #define ETL_ASSERT_FAIL_AND_RETURN_VALUE(e, v) static_cast<void>(sizeof(b)) // Does nothing.
#elif defined(ETL_USE_ASSERT_FUNCTION)
  #define ETL_ASSERT(b, e) do {if (!(b)) ETL_UNLIKELY {etl::private_error_handler::assert_handler<0>::assert_function_ptr((e));}} while(false)                                 // If the condition fails, calls the assert function
  #define ETL_ASSERT_OR_RETURN(b, e) do {if (!(b)) ETL_UNLIKELY {etl::private_error_handler::assert_handler<0>::assert_function_ptr((e)); return;}} while(false)               // If the condition fails, calls the assert function and return
  #define ETL_ASSERT_OR_RETURN_VALUE(b, e, v) do {if (!(b)) ETL_UNLIKELY {etl::private_error_handler::assert_handler<0>::assert_function_ptr((e)); return (v);}} while(false)  // If the condition fails, calls the assert function and return a value
 
  #define ETL_ASSERT_FAIL(e) do {etl::private_error_handler::assert_handler<0>::assert_function_ptr((e));} while(false)                                          // Calls the assert function
  #define ETL_ASSERT_FAIL_AND_RETURN(e) do {etl::private_error_handler::assert_handler<0>::assert_function_ptr((e)); return;} while(false)                       // Calls the assert function and return
  #define ETL_ASSERT_FAIL_AND_RETURN_VALUE(e, v) do {etl::private_error_handler::assert_handler<0>::assert_function_ptr((e)); return (v);} while(false)          // Calls the assert function and return a value
#elif ETL_USING_EXCEPTIONS
  #if defined(ETL_LOG_ERRORS)
    #define ETL_ASSERT(b, e) do {if (!(b)) ETL_UNLIKELY {etl::error_handler::error((e)); throw((e));}} while(false)                                // If the condition fails, calls the error handler then throws an exception.
    #define ETL_ASSERT_OR_RETURN(b, e) do {if (!(b)) ETL_UNLIKELY {etl::error_handler::error((e)); throw((e)); return;}} while(false)              // If the condition fails, calls the error handler then throws an exception.
    #define ETL_ASSERT_OR_RETURN_VALUE(b, e, v) do {if (!(b)) ETL_UNLIKELY {etl::error_handler::error((e)); throw((e)); return(v);}} while(false)  // If the condition fails, calls the error handler then throws an exception.
    
    #define ETL_ASSERT_FAIL(e) do {etl::error_handler::error((e)); throw((e));} while(false)                                          // Calls the error handler then throws an exception.
    #define ETL_ASSERT_FAIL_AND_RETURN(e) do {etl::error_handler::error((e)); throw((e)); return;} while(false)                       // Calls the error handler then throws an exception.
    #define ETL_ASSERT_FAIL_AND_RETURN_VALUE(e, v) do {etl::error_handler::error((e)); throw((e)); return(v);} while(false)           // Calls the error handler then throws an exception.
  #else
    #define ETL_ASSERT(b, e) do {if (!(b)) ETL_UNLIKELY {throw((e));}} while(false)                    // If the condition fails, throws an exception.
    #define ETL_ASSERT_OR_RETURN(b, e) do {if (!(b)) ETL_UNLIKELY {throw((e));}} while(false)          // If the condition fails, throws an exception.
    #define ETL_ASSERT_OR_RETURN_VALUE(b, e, v) do {if (!(b)) ETL_UNLIKELY {throw((e));}} while(false) // If the condition fails, throws an exception.
    
    #define ETL_ASSERT_FAIL(e) do {throw((e));} while(false)                              // Throws an exception.
    #define ETL_ASSERT_FAIL_AND_RETURN(e) do {throw((e));} while(false)                   // Throws an exception.
    #define ETL_ASSERT_FAIL_AND_RETURN_VALUE(e, v) do {throw((e));} while(false)          // Throws an exception.
  #endif
#else
  #if defined(ETL_LOG_ERRORS)
    #define ETL_ASSERT(b, e) do {if (!(b)) ETL_UNLIKELY {etl::error_handler::error((e));}} while(false)                                 // If the condition fails, calls the error handler
    #define ETL_ASSERT_OR_RETURN(b, e) do {if (!(b)) ETL_UNLIKELY {etl::error_handler::error((e)); return;}} while(false)               // If the condition fails, calls the error handler and return
    #define ETL_ASSERT_OR_RETURN_VALUE(b, e, v) do {if (!(b)) ETL_UNLIKELY {etl::error_handler::error((e)); return (v);}} while(false)  // If the condition fails, calls the error handler and return a value
    
    #define ETL_ASSERT_FAIL(e) do {etl::error_handler::error((e));} while(false)                                          // Calls the error handler
    #define ETL_ASSERT_FAIL_AND_RETURN(e) do {etl::error_handler::error((e)); return;} while(false)                       // Calls the error handler and return
    #define ETL_ASSERT_FAIL_AND_RETURN_VALUE(e, v) do {etl::error_handler::error((e)); return (v);} while(false)          // Calls the error handler and return a value
  #else
    #if ETL_IS_DEBUG_BUILD
      #define ETL_ASSERT(b, e) assert((b))                                                                                             // If the condition fails, asserts.
      #define ETL_ASSERT_OR_RETURN(b, e) do {if (!(b)) ETL_UNLIKELY {assert(false); return;}} while(false)                             // If the condition fails, asserts and return.
      #define ETL_ASSERT_OR_RETURN_VALUE(b, e, v) do {if (!(b)) ETL_UNLIKELY {assert(false); return(v);}} while(false)                 // If the condition fails, asserts and return a value.
    
      #define ETL_ASSERT_FAIL(e) assert(false)                                                    // Asserts.
      #define ETL_ASSERT_FAIL_AND_RETURN(e) do {assert(false);  return;} while(false)             // Asserts.
      #define ETL_ASSERT_FAIL_AND_RETURN_VALUE(e, v) do {assert(false);  return(v);} while(false) // Asserts.
    #else
      #define ETL_ASSERT(b, e) static_cast<void>(sizeof(b))                                            // Does nothing.
      #define ETL_ASSERT_OR_RETURN(b, e) do {if (!(b)) ETL_UNLIKELY return;} while(false)              // Returns.
      #define ETL_ASSERT_OR_RETURN_VALUE(b, e, v) do {if (!(b)) ETL_UNLIKELY return(v);} while(false)  // Returns a value.
      
      #define ETL_ASSERT_FAIL(e) ETL_DO_NOTHING                                                   // Does nothing.
      #define ETL_ASSERT_FAIL_AND_RETURN(e) do {return;} while(false)                             // Returns.
      #define ETL_ASSERT_FAIL_AND_RETURN_VALUE(e, v) do {return(v);} while(false)                 // Returns a value.
    #endif
  #endif
#endif
 
//*************************************
#if defined(ETL_CHECK_PUSH_POP)
    #define ETL_ASSERT_CHECK_PUSH_POP(b, e)           ETL_ASSERT(b, e)
    #define ETL_ASSERT_CHECK_PUSH_POP_OR_RETURN(b, e) ETL_ASSERT_OR_RETURN(b, e)
#else
    #define ETL_ASSERT_CHECK_PUSH_POP(b, e)
    #define ETL_ASSERT_CHECK_PUSH_POP_OR_RETURN(b, e)
#endif
 
//*************************************
#ifdef ETL_CHECK_INDEX_OPERATOR
  #define ETL_CHECKING_INDEX_OPERATOR 1
  #define ETL_NOT_CHECKING_INDEX_OPERATOR 0
  #define ETL_ASSERT_CHECK_INDEX_OPERATOR(b, e) ETL_ASSERT(b,e)
#else
  #define ETL_CHECKING_INDEX_OPERATOR 0
  #define ETL_NOT_CHECKING_INDEX_OPERATOR 1
  #define ETL_ASSERT_CHECK_INDEX_OPERATOR(b, e)
#endif
 
//*************************************
#ifdef ETL_CHECK_EXTRA
    #define ETL_CHECKING_EXTRA 1
    #define ETL_NOT_CHECKING_EXTRA 0
    #define ETL_ASSERT_CHECK_EXTRA(b, e) ETL_ASSERT(b,e)
#else
    #define ETL_CHECKING_EXTRA 0
    #define ETL_NOT_CHECKING_EXTRA 1
    #define ETL_ASSERT_CHECK_EXTRA(b, e)
#endif
 
//*************************************
#if defined(ETL_VERBOSE_ERRORS)
  #define ETL_ERROR(e) (e(__FILE__, __LINE__))                                // Make an exception with the file name and line number.
  #define ETL_ERROR_WITH_VALUE(e, v) (e(__FILE__, __LINE__, (v)))             // Make an exception with the file name, line number and value.
  #define ETL_ERROR_TEXT(verbose_text, terse_text) (verbose_text)             // Use the verbose text.
  #define ETL_ERROR_GENERIC(text) (etl::exception((text),__FILE__, __LINE__)) // Make a generic exception with a message, file name and line number.
#else
  #define ETL_ERROR(e) (e("", __LINE__))                                      // Make an exception with the line number.
  #define ETL_ERROR_WITH_VALUE(e, v) (e("", __LINE__, (v)))                   // Make an exception with the file name, line number and value.
  #define ETL_ERROR_TEXT(verbose_text, terse_text) (terse_text)               // Use the terse text.
  #define ETL_ERROR_GENERIC(text) (etl::exception((text),"", __LINE__))       // Make a generic exception with a message and line number.
#endif
 
#endif