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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJ_EXCEPTION_H__
+#define __PJ_EXCEPTION_H__
+
+/**
+ * @file except.h
+ * @brief Exception Handling in C.
+ */
+
+#include <pj/types.h>
+#include <pj/compat/setjmp.h>
+#include <pj/log.h>
+
+
+PJ_BEGIN_DECL
+
+
+/**
+ * @defgroup PJ_EXCEPT Exception Handling
+ * @ingroup PJ_MISC
+ * @{
+ *
+ * \section pj_except_sample_sec Quick Example
+ *
+ * For the impatient, take a look at some examples:
+ *  - @ref page_pjlib_samples_except_c
+ *  - @ref page_pjlib_exception_test
+ *
+ * \section pj_except_except Exception Handling
+ *
+ * This module provides exception handling syntactically similar to C++ in
+ * C language. In Win32 systems, it uses Windows Structured Exception
+ * Handling (SEH) if macro PJ_EXCEPTION_USE_WIN32_SEH is non-zero.
+ * Otherwise it will use setjmp() and longjmp().
+ *
+ * On some platforms where setjmp/longjmp is not available, setjmp/longjmp 
+ * implementation is provided. See <pj/compat/setjmp.h> for compatibility.
+ *
+ * The exception handling mechanism is completely thread safe, so the exception
+ * thrown by one thread will not interfere with other thread.
+ *
+ * The exception handling constructs are similar to C++. The blocks will be
+ * constructed similar to the following sample:
+ *
+ * \verbatim
+   #define NO_MEMORY     1
+   #define SYNTAX_ERROR  2
+  
+   int sample1()
+   {
+      PJ_USE_EXCEPTION;  // declare local exception stack.
+  
+      PJ_TRY {
+        ...// do something..
+      }
+      PJ_CATCH(NO_MEMORY) {
+        ... // handle exception 1
+      }
+      PJ_END;
+   }
+
+   int sample2()
+   {
+      PJ_USE_EXCEPTION;  // declare local exception stack.
+  
+      PJ_TRY {
+        ...// do something..
+      }
+      PJ_CATCH_ANY {
+         if (PJ_GET_EXCEPTION() == NO_MEMORY)
+	    ...; // handle no memory situation
+	 else if (PJ_GET_EXCEPTION() == SYNTAX_ERROR)
+	    ...; // handle syntax error
+      }
+      PJ_END;
+   }
+   \endverbatim
+ *
+ * The above sample uses hard coded exception ID. It is @b strongly
+ * recommended that applications request a unique exception ID instead
+ * of hard coded value like above.
+ *
+ * \section pj_except_reg Exception ID Allocation
+ *
+ * To ensure that exception ID (number) are used consistently and to
+ * prevent ID collisions in an application, it is strongly suggested that 
+ * applications allocate an exception ID for each possible exception
+ * type. As a bonus of this process, the application can identify
+ * the name of the exception when the particular exception is thrown.
+ *
+ * Exception ID management are performed with the following APIs:
+ *  - #pj_exception_id_alloc().
+ *  - #pj_exception_id_free().
+ *  - #pj_exception_id_name().
+ *
+ *
+ * PJLIB itself automatically allocates one exception id, i.e.
+ * #PJ_NO_MEMORY_EXCEPTION which is declared in <pj/pool.h>. This exception
+ * ID is raised by default pool policy when it fails to allocate memory.
+ *
+ * CAVEATS:
+ *  - unlike C++ exception, the scheme here won't call destructors of local
+ *    objects if exception is thrown. Care must be taken when a function
+ *    hold some resorce such as pool or mutex etc.
+ *  - You CAN NOT make nested exception in one single function without using
+ *    a nested PJ_USE_EXCEPTION. Samples:
+  \verbatim
+	void wrong_sample()
+	{
+	    PJ_USE_EXCEPTION;
+
+	    PJ_TRY {
+		// Do stuffs
+		...
+	    }
+	    PJ_CATCH_ANY {
+		// Do other stuffs
+		....
+		..
+
+		// The following block is WRONG! You MUST declare 
+		// PJ_USE_EXCEPTION once again in this block.
+		PJ_TRY {
+		    ..
+		}
+		PJ_CATCH_ANY {
+		    ..
+		}
+		PJ_END;
+	    }
+	    PJ_END;
+	}
+
+  \endverbatim
+
+ *  - You MUST NOT exit the function inside the PJ_TRY block. The correct way
+ *    is to return from the function after PJ_END block is executed. 
+ *    For example, the following code will yield crash not in this code,
+ *    but rather in the subsequent execution of PJ_TRY block:
+  \verbatim
+        void wrong_sample()
+	{
+	    PJ_USE_EXCEPTION;
+
+	    PJ_TRY {
+		// do some stuffs
+		...
+		return;	        <======= DO NOT DO THIS!
+	    }
+	    PJ_CATCH_ANY {
+	    }
+	    PJ_END;
+	}
+  \endverbatim
+  
+ *  - You can not provide more than PJ_CATCH or PJ_CATCH_ANY nor use PJ_CATCH
+ *    and PJ_CATCH_ANY for a single PJ_TRY.
+ *  - Exceptions will always be caught by the first handler (unlike C++ where
+ *    exception is only caught if the type matches.
+
+ * \section PJ_EX_KEYWORDS Keywords
+ *
+ * \subsection PJ_THROW PJ_THROW(expression)
+ * Throw an exception. The expression thrown is an integer as the result of
+ * the \a expression. This keyword can be specified anywhere within the 
+ * program.
+ *
+ * \subsection PJ_USE_EXCEPTION PJ_USE_EXCEPTION
+ * Specify this in the variable definition section of the function block 
+ * (or any blocks) to specify that the block has \a PJ_TRY/PJ_CATCH exception 
+ * block. 
+ * Actually, this is just a macro to declare local variable which is used to
+ * push the exception state to the exception stack.
+ * Note: you must specify PJ_USE_EXCEPTION as the last statement in the
+ * local variable declarations, since it may evaluate to nothing.
+ *
+ * \subsection PJ_TRY PJ_TRY
+ * The \a PJ_TRY keyword is typically followed by a block. If an exception is
+ * thrown in this block, then the execution will resume to the \a PJ_CATCH 
+ * handler.
+ *
+ * \subsection PJ_CATCH PJ_CATCH(expression)
+ * The \a PJ_CATCH is normally followed by a block. This block will be executed
+ * if the exception being thrown is equal to the expression specified in the
+ * \a PJ_CATCH.
+ *
+ * \subsection PJ_CATCH_ANY PJ_CATCH_ANY
+ * The \a PJ_CATCH is normally followed by a block. This block will be executed
+ * if any exception was raised in the TRY block.
+ *
+ * \subsection PJ_END PJ_END
+ * Specify this keyword to mark the end of \a PJ_TRY / \a PJ_CATCH blocks.
+ *
+ * \subsection PJ_GET_EXCEPTION PJ_GET_EXCEPTION(void)
+ * Get the last exception thrown. This macro is normally called inside the
+ * \a PJ_CATCH or \a PJ_CATCH_ANY block, altough it can be used anywhere where
+ * the \a PJ_USE_EXCEPTION definition is in scope.
+ *
+ * 
+ * \section pj_except_examples_sec Examples
+ *
+ * For some examples on how to use the exception construct, please see:
+ *  - @ref page_pjlib_samples_except_c
+ *  - @ref page_pjlib_exception_test
+ */
+
+/**
+ * Allocate a unique exception id.
+ * Applications don't have to allocate a unique exception ID before using
+ * the exception construct. However, by doing so it ensures that there is
+ * no collisions of exception ID.
+ *
+ * As a bonus, when exception number is acquired through this function,
+ * the library can assign name to the exception (only if 
+ * PJ_HAS_EXCEPTION_NAMES is enabled (default is yes)) and find out the
+ * exception name when it catches an exception.
+ *
+ * @param name      Name to be associated with the exception ID.
+ * @param id        Pointer to receive the ID.
+ *
+ * @return          PJ_SUCCESS on success or PJ_ETOOMANY if the library 
+ *                  is running out out ids.
+ */
+PJ_DECL(pj_status_t) pj_exception_id_alloc(const char *name,
+                                           pj_exception_id_t *id);
+
+/**
+ * Free an exception id.
+ *
+ * @param id        The exception ID.
+ *
+ * @return          PJ_SUCCESS or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pj_exception_id_free(pj_exception_id_t id);
+
+/**
+ * Retrieve name associated with the exception id.
+ *
+ * @param id        The exception ID.
+ *
+ * @return          The name associated with the specified ID.
+ */
+PJ_DECL(const char*) pj_exception_id_name(pj_exception_id_t id);
+
+
+/** @} */
+
+#if defined(PJ_EXCEPTION_USE_WIN32_SEH) && PJ_EXCEPTION_USE_WIN32_SEH != 0
+/*****************************************************************************
+ **
+ ** IMPLEMENTATION OF EXCEPTION USING WINDOWS SEH
+ **
+ ****************************************************************************/
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+PJ_IDECL_NO_RETURN(void)
+pj_throw_exception_(pj_exception_id_t id) PJ_ATTR_NORETURN
+{
+    RaiseException(id,1,0,NULL);
+}
+
+#define PJ_USE_EXCEPTION    
+#define PJ_TRY		    __try
+#define PJ_CATCH(id)	    __except(GetExceptionCode()==id ? \
+				      EXCEPTION_EXECUTE_HANDLER : \
+				      EXCEPTION_CONTINUE_SEARCH)
+#define PJ_CATCH_ANY	    __except(EXCEPTION_EXECUTE_HANDLER)
+#define PJ_END		    
+#define PJ_THROW(id)	    pj_throw_exception_(id)
+#define PJ_GET_EXCEPTION()  GetExceptionCode()
+
+
+#elif defined(PJ_SYMBIAN) && PJ_SYMBIAN!=0
+/*****************************************************************************
+ **
+ ** IMPLEMENTATION OF EXCEPTION USING SYMBIAN LEAVE/TRAP FRAMEWORK
+ **
+ ****************************************************************************/
+
+/* To include this file, the source file must be compiled as
+ * C++ code!
+ */
+#ifdef __cplusplus
+
+class TPjException
+{
+public:
+    int code_;
+};
+
+#define PJ_USE_EXCEPTION
+#define PJ_TRY			try
+//#define PJ_CATCH(id)		
+#define PJ_CATCH_ANY		catch (const TPjException & pj_excp_)
+#define PJ_END
+#define PJ_THROW(x_id)		do { TPjException e; e.code_=x_id; throw e;} \
+				while (0)
+#define PJ_GET_EXCEPTION()	pj_excp_.code_
+
+#else
+
+#define PJ_USE_EXCEPTION
+#define PJ_TRY				
+#define PJ_CATCH_ANY		if (0)
+#define PJ_END
+#define PJ_THROW(x_id)		do { PJ_LOG(1,("PJ_THROW"," error code = %d",x_id)); } while (0)
+#define PJ_GET_EXCEPTION()	0
+
+#endif	/* __cplusplus */
+
+#else
+/*****************************************************************************
+ **
+ ** IMPLEMENTATION OF EXCEPTION USING GENERIC SETJMP/LONGJMP
+ **
+ ****************************************************************************/
+
+/**
+ * This structure (which should be invisible to user) manages the TRY handler
+ * stack.
+ */
+struct pj_exception_state_t
+{    
+    pj_jmp_buf state;                   /**< jmp_buf.                    */
+    struct pj_exception_state_t *prev;  /**< Previous state in the list. */
+};
+
+/**
+ * Throw exception.
+ * @param id    Exception Id.
+ */
+PJ_DECL_NO_RETURN(void) 
+pj_throw_exception_(pj_exception_id_t id) PJ_ATTR_NORETURN;
+
+/**
+ * Push exception handler.
+ */
+PJ_DECL(void) pj_push_exception_handler_(struct pj_exception_state_t *rec);
+
+/**
+ * Pop exception handler.
+ */
+PJ_DECL(void) pj_pop_exception_handler_(struct pj_exception_state_t *rec);
+
+/**
+ * Declare that the function will use exception.
+ * @hideinitializer
+ */
+#define PJ_USE_EXCEPTION    struct pj_exception_state_t pj_x_except__; int pj_x_code__
+
+/**
+ * Start exception specification block.
+ * @hideinitializer
+ */
+#define PJ_TRY		    if (1) { \
+				pj_push_exception_handler_(&pj_x_except__); \
+				pj_x_code__ = pj_setjmp(pj_x_except__.state); \
+				if (pj_x_code__ == 0)
+/**
+ * Catch the specified exception Id.
+ * @param id    The exception number to catch.
+ * @hideinitializer
+ */
+#define PJ_CATCH(id)	    else if (pj_x_code__ == (id))
+
+/**
+ * Catch any exception number.
+ * @hideinitializer
+ */
+#define PJ_CATCH_ANY	    else
+
+/**
+ * End of exception specification block.
+ * @hideinitializer
+ */
+#define PJ_END			pj_pop_exception_handler_(&pj_x_except__); \
+			    } else {}
+
+/**
+ * Throw exception.
+ * @param exception_id  The exception number.
+ * @hideinitializer
+ */
+#define PJ_THROW(exception_id)	pj_throw_exception_(exception_id)
+
+/**
+ * Get current exception.
+ * @return      Current exception code.
+ * @hideinitializer
+ */
+#define PJ_GET_EXCEPTION()	(pj_x_code__)
+
+#endif	/* PJ_EXCEPTION_USE_WIN32_SEH */
+
+
+PJ_END_DECL
+
+
+
+#endif	/* __PJ_EXCEPTION_H__ */
+
+