--- parser3/src/include/pa_pool.h 2001/03/10 15:44:30 1.26 +++ parser3/src/include/pa_pool.h 2002/02/08 08:30:13 1.78 @@ -1,125 +1,181 @@ -/* - $Id: pa_pool.h,v 1.26 2001/03/10 15:44:30 paf Exp $ +/** @file + Parser: pool class decl. + + Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com) + + Author: Alexandr Petrosian (http://paf.design.ru) + + $Id: pa_pool.h,v 1.78 2002/02/08 08:30:13 paf Exp $ */ #ifndef PA_POOL_H #define PA_POOL_H -#include +#include "pa_config_includes.h" + +#ifdef XML +# include "gdome.h" +// for xmlChar +# include "libxml/tree.h" +#endif + +// forwards -//class String; class Exception; -class Temp_exception; +class String; +class Charset; +class GdomeDOMString_auto_ptr; + +/** + Pool mechanizm allows users not to free up allocated memory, + leaving that problem to 'pools'. + + @see Pooled +*/ class Pool { - friend Temp_exception; public: - Pool() : fexception(0) {} - ~Pool() {} + Pool(void *astorage); - Exception& exception() const { return *fexception; } + ///{@ statistics + size_t total_allocated() { return ftotal_allocated; } + unsigned int total_times() { return ftotal_times; } + ///}@ - void *malloc(size_t size) { - return check(real_malloc(size), size); + void set_context(void *acontext) { fcontext=acontext; } + void *get_context() { return fcontext; } + + /// allocates some bytes on pool + void *malloc(size_t size, int place=0) { + return check(real_malloc(size, place), size); } + /// allocates some bytes clearing them with zeros void *calloc(size_t size) { return check(real_calloc(size), size); } -private: // implementation defined + /// registers a routine to clean up non-pooled allocations + void register_cleanup(void (*cleanup) (void *), void *data) { + if(!real_register_cleanup(cleanup, data)) + fail_register_cleanup(); + } + + ///{@ source charset + void set_source_charset(Charset& acharset); + Charset& get_source_charset(); + ///}@ + + ///{@ client charset + void set_client_charset(Charset& charset); + Charset& get_client_charset(); + ///}@ + +#ifdef XML + + /// @see Charset::transcode_cstr(xmlChar *s); + const char *transcode_cstr(xmlChar *s); + /// @see Charset::transcode(xmlChar *s); + String& transcode(xmlChar *s); + /// @see Charset::transcode_cstr(GdomeDOMString *s); + const char *transcode_cstr(GdomeDOMString *s); + /// @see Charset::transcode(GdomeDOMString *s); + String& transcode(GdomeDOMString *s); + /// @see Charset::transcode(const String& s) + GdomeDOMString_auto_ptr transcode(const String& s); - void *real_malloc(size_t size); +#endif + +private: + + void *fstorage; + void *fcontext; + Charset *source_charset; + Charset *client_charset; + +private: + + //{ + /// @name implementation defined + void *real_malloc(size_t size, int place); void *real_calloc(size_t size); + bool real_register_cleanup(void (*cleanup) (void *), void *data); + //} private: - // checks whether mem allocated OK. throws exception otherwise + /// checks whether mem allocated OK. throws exception otherwise void *check(void *ptr, size_t size) { - if(ptr) + if(ptr) { + ftotal_allocated+=size; + ftotal_times++; return ptr; + } - fail(size); + fail_alloc(size); // never reached return 0; } - // throws proper exception - void fail(size_t size) const; - -protected: // exception handling - - // exception replacement mechanism is 'protected' from direct usage - // Temp_exception_change object enforces paired set/restore - Exception *set_exception(Exception *e){ - Exception *r=fexception; - fexception=e; - return r; - } - void restore_exception(Exception *e) { - fexception=e; - } + /// throws allocation exception + void fail_alloc(size_t size) const; -private: + /// throws register cleanup exception + void fail_register_cleanup() const; - // current request's exception object - Exception *fexception; +private: // statistics + + size_t ftotal_allocated; + unsigned int ftotal_times; private: //disabled - // Pool(const Pool&) {} - Pool& operator = (const Pool&) { return *this; } + Pool(const Pool&); + Pool& operator= (const Pool&); }; +/** + Base for all classes that are allocated in 'pools'. + + Holds Pool object. Contains useful wrappers to it's methods. + + @see NEW +*/ class Pooled { // the pool i'm allocated on - Pool& fpool; + Pool *fpool; public: - + + /// the Pooled-sole: Pooled instances can be allocated in Pool rather then on heap static void *operator new(size_t size, Pool& apool) { - return apool.malloc(size); + return apool.malloc(size, 1); } - Pooled(Pool& apool) : fpool(apool) { - } + Pooled(Pool& apool) : fpool(&apool) {} - Pool& pool() const { return fpool; } + /// my pool + Pool& pool() const { return *fpool; } - void *malloc(size_t size) const { return fpool.malloc(size); } - void *calloc(size_t size) const { return fpool.calloc(size); } - Exception& exception() const { return fpool.exception(); } -}; -#define NEW new(pool()) + /** used for moving objects from one pool to another. + in between object can have no pool and can not be used + @see SQL_Driver_manager + */ + void set_pool(Pool *apool) { fpool=apool; } -class Temp_exception { - Pool pool; - Exception *saved_exception; -public: - Temp_exception(Pool& apool, Exception& exception) : - pool(apool), - saved_exception(apool.set_exception(&exception)) { - } - ~Temp_exception() { - pool.restore_exception(saved_exception); - } -}; + //{ + /// @name useful wrapper around pool + void *malloc(size_t size, int place=0) const { return fpool->malloc(size, place); } + void *calloc(size_t size) const { return fpool->calloc(size); } + void register_cleanup(void (*cleanup) (void *), void *data) { fpool->register_cleanup(cleanup, data); } +#ifdef XML -#define TRY \ - { \ - Exception temp_exception; \ - Temp_exception le(pool(), temp_exception); \ - if(setjmp(temp_exception.mark)==0) - -#define THROW exception()._throw -#define POOL_THROW pool.exception()._throw -#define CATCH(e) \ - else{ \ - Exception& e=temp_exception; + const char *transcode_cstr(GdomeDOMString *s) { return fpool->transcode_cstr(s); } + String& transcode(GdomeDOMString *s) { return fpool->transcode(s); } -#define END_CATCH \ - } \ - } -// usage: -// TRY { ...; if(?) RAISE(?); ...; } CATCH(e) { catch-code e.comment() } END_CATCH +#endif + //} +}; +/// useful macro for creating objects on current Pooled object Pooled::pool() +#define NEW new(pool()) #endif