--- parser3/src/include/pa_pool.h 2001/03/10 15:44:30 1.26 +++ parser3/src/include/pa_pool.h 2001/09/21 08:41:28 1.58 @@ -1,56 +1,125 @@ -/* - $Id: pa_pool.h,v 1.26 2001/03/10 15:44:30 paf Exp $ +/** @file + Parser: pool class decl. + + Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) + + Author: Alexander Petrosyan (http://design.ru/paf) + + $Id: pa_pool.h,v 1.58 2001/09/21 08:41:28 parser Exp $ */ #ifndef PA_POOL_H #define PA_POOL_H -#include +#include "pa_config_includes.h" + +#include +#include +#include + + +// forwards -//class String; class Exception; class Temp_exception; +class String; + +/** + Pool mechanizm allows users not to free up allocated memory, + leaving that problem to 'pools'. + + Also holds Exception object, which can be temporary set using + Temp_exception auto-object. + + @see Pooled +*/ class Pool { friend Temp_exception; public: - Pool() : fexception(0) {} - ~Pool() {} + Pool(void *astorage); + ~Pool(); - Exception& exception() const { return *fexception; } + void set_context(void *acontext) { fcontext=acontext; } + void *context() { return fcontext; } + + void set_tag(void *atag) { ftag=atag; } + void *tag() { return ftag; } - void *malloc(size_t size) { - return check(real_malloc(size), size); + /// 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(); + } + + /// current exception object of the pool + Exception& exception() const { return *fexception; } + + /// resets transcoder if they change charset + void set_charset(const String &charset); + /// returns current charset + const String& get_charset() { return *charset; } + /// converts Xalan string to char * + const char *transcode_cstr(const XalanDOMString& s); + /// converts Xalan string to parser String + String& transcode(const XalanDOMString& s); + /// converts XSL exception to parser exception + void _throw(const String *source, const XSLException& e); + +private: + + void set_charset(const char *new_scharset); + void update_transcoder(); - void *real_malloc(size_t size); +private: + + void *fstorage; + void *fcontext; + void *ftag; + const String *charset; + XMLTranscoder *transcoder; + +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) return ptr; - fail(size); + fail_alloc(size); // never reached return 0; } - // throws proper exception - void fail(size_t size) const; + /// throws allocation exception + void fail_alloc(size_t size) const; -protected: // exception handling + /// throws register cleanup exception + void fail_register_cleanup() const; - // exception replacement mechanism is 'protected' from direct usage - // Temp_exception_change object enforces paired set/restore +private: // exception handling + + // exception replacement mechanism is 'private'zed from direct usage + // Temp_exception object enforces paired set/restore Exception *set_exception(Exception *e){ Exception *r=fexception; fexception=e; @@ -71,55 +140,106 @@ private: //disabled Pool& operator = (const Pool&) { return *this; } }; +/** + Base for all classes that are allocated in 'pools'. + + Holds Pool object. Contains useful wrappers to it's methods. + + @see NEW, Temp_exception +*/ 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(); } + /** 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; } + + //{ + /// @name useful wrapper around pool + void *malloc(size_t size) const { return fpool->malloc(size); } + void *calloc(size_t size) const { return fpool->calloc(size); } + void register_cleanup(void (*cleanup) (void *), void *data) { fpool->register_cleanup(cleanup, data); } + Exception& exception() const { return fpool->exception(); } + const char *transcode_cstr(const XalanDOMString& s) { return fpool->transcode_cstr(s); } + String& transcode(const XalanDOMString& s) { return fpool->transcode(s); } + void _throw(const String *source, const XSLException& e) { fpool->_throw(source, e); } + //} }; +/// useful macro for creating objects on current Pooled object Pooled::pool() #define NEW new(pool()) +/** + Auto-object used for temporary changing Pool's exception(). + + Use by with these macros: + @code + TRY { + // ... + if(?) + THROW(?); + // ... + } CATCH(e) { + // code, using e fields + // e.comment() + } + END_CATCH + @endcode + + @see TRY, THROW +*/ class Temp_exception { - Pool pool; + Pool& fpool; Exception *saved_exception; public: Temp_exception(Pool& apool, Exception& exception) : - pool(apool), + fpool(apool), saved_exception(apool.set_exception(&exception)) { } ~Temp_exception() { - pool.restore_exception(saved_exception); + fpool.restore_exception(saved_exception); } }; -#define TRY \ +#define XTRY(pool) \ { \ Exception temp_exception; \ - Temp_exception le(pool(), 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) \ +#define XTHROW(exception) exception._throw +#define XCATCH(e) \ else{ \ Exception& e=temp_exception; -#define END_CATCH \ +#define XEND_CATCH \ } \ } -// usage: -// TRY { ...; if(?) RAISE(?); ...; } CATCH(e) { catch-code e.comment() } END_CATCH + +//@{ +/// @see Temp_exception +#define TRY XTRY(pool()) +#define THROW XTHROW(exception()) +#define CATCH(e) XCATCH(e) +#define END_CATCH XEND_CATCH + +#define PTRY XTRY(pool) +#define PTHROW XTHROW(pool.exception()) +#define PCATCH(e) XCATCH(e) +#define PEND_CATCH XEND_CATCH +//@} #endif