Annotation of parser3/src/include/pa_pool.h, revision 1.60
1.34 paf 1: /** @file
1.36 paf 2: Parser: pool class decl.
3:
1.27 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.36 paf 5:
1.28 paf 6: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.27 paf 7:
1.60 ! parser 8: $Id: pa_pool.h,v 1.59 2001/09/21 14:46:09 parser Exp $
1.1 paf 9: */
10:
11: #ifndef PA_POOL_H
12: #define PA_POOL_H
13:
1.52 parser 14: #include "pa_config_includes.h"
1.1 paf 15:
1.59 parser 16: #ifdef XML
1.55 parser 17: #include <XalanDOM/XalanDOMString.hpp>
18: #include <util/TransService.hpp>
19: #include <PlatformSupport/XSLException.hpp>
1.59 parser 20: #endif
1.55 parser 21:
22: // forwards
23:
1.21 paf 24: class Exception;
1.25 paf 25: class Temp_exception;
1.55 parser 26: class String;
27:
1.35 paf 28: /**
1.34 paf 29: Pool mechanizm allows users not to free up allocated memory,
30: leaving that problem to 'pools'.
31:
32: Also holds Exception object, which can be temporary set using
33: Temp_exception auto-object.
1.38 paf 34:
35: @see Pooled
1.34 paf 36: */
1.47 paf 37:
1.1 paf 38: class Pool {
1.25 paf 39: friend Temp_exception;
1.1 paf 40: public:
1.18 paf 41:
1.55 parser 42: Pool(void *astorage);
1.56 parser 43: ~Pool();
1.18 paf 44:
1.40 paf 45: void set_context(void *acontext) { fcontext=acontext; }
46: void *context() { return fcontext; }
1.39 paf 47:
1.47 paf 48: void set_tag(void *atag) { ftag=atag; }
49: void *tag() { return ftag; }
1.44 paf 50:
1.34 paf 51: /// allocates some bytes on pool
1.51 parser 52: void *malloc(size_t size/*, int place=0*/) {
53: return check(real_malloc(size/*, place*/), size);
1.18 paf 54: }
1.34 paf 55: /// allocates some bytes clearing them with zeros
1.18 paf 56: void *calloc(size_t size) {
57: return check(real_calloc(size), size);
58: }
1.39 paf 59:
1.53 parser 60: /// registers a routine to clean up non-pooled allocations
1.54 parser 61: void register_cleanup(void (*cleanup) (void *), void *data) {
62: if(!real_register_cleanup(cleanup, data))
63: fail_register_cleanup();
64: }
1.53 parser 65:
66: /// current exception object of the pool
67: Exception& exception() const { return *fexception; }
68:
1.60 ! parser 69: /// resets transcoder if they change charset
! 70: void set_charset(const String &charset);
! 71: /// returns current charset
! 72: const String& get_charset() { return *charset; }
! 73:
1.39 paf 74: private:
75:
76: void *fstorage;
1.40 paf 77: void *fcontext;
1.47 paf 78: void *ftag;
1.60 ! parser 79: const String *charset;
1.8 paf 80:
1.50 parser 81: private:
82:
83: //{
84: /// @name implementation defined
1.51 parser 85: void *real_malloc(size_t size/*, int place*/);
1.20 paf 86: void *real_calloc(size_t size);
1.54 parser 87: bool real_register_cleanup(void (*cleanup) (void *), void *data);
1.50 parser 88: //}
1.17 paf 89:
1.23 paf 90: private:
1.17 paf 91:
1.34 paf 92: /// checks whether mem allocated OK. throws exception otherwise
1.23 paf 93: void *check(void *ptr, size_t size) {
94: if(ptr)
95: return ptr;
96:
1.54 parser 97: fail_alloc(size);
1.23 paf 98:
99: // never reached
100: return 0;
101: }
1.54 parser 102: /// throws allocation exception
103: void fail_alloc(size_t size) const;
104:
105: /// throws register cleanup exception
106: void fail_register_cleanup() const;
1.23 paf 107:
1.34 paf 108: private: // exception handling
1.17 paf 109:
1.45 paf 110: // exception replacement mechanism is 'private'zed from direct usage
1.34 paf 111: // Temp_exception object enforces paired set/restore
1.23 paf 112: Exception *set_exception(Exception *e){
1.31 paf 113: Exception *r=fexception;
114: fexception=e;
1.23 paf 115: return r;
116: }
117: void restore_exception(Exception *e) {
1.31 paf 118: fexception=e;
1.23 paf 119: }
120:
121: private:
122:
123: // current request's exception object
1.31 paf 124: Exception *fexception;
1.17 paf 125:
1.59 parser 126: #ifdef XML
127:
128: public:
129: /// converts Xalan string to char *
130: const char *transcode_cstr(const XalanDOMString& s);
131: /// converts Xalan string to parser String
132: String& transcode(const XalanDOMString& s);
133: /// converts XSL exception to parser exception
134: void _throw(const String *source, const XSLException& e);
135:
136: private:
137:
138: void set_charset(const char *new_scharset);
139: void update_transcoder();
140:
141: private:
142:
143: XMLTranscoder *transcoder;
144:
145: #endif
146:
1.8 paf 147: private: //disabled
148:
1.18 paf 149: // Pool(const Pool&) {}
1.16 paf 150: Pool& operator = (const Pool&) { return *this; }
1.21 paf 151: };
152:
1.35 paf 153: /**
1.34 paf 154: Base for all classes that are allocated in 'pools'.
155:
156: Holds Pool object. Contains useful wrappers to it's methods.
1.38 paf 157:
158: @see NEW, Temp_exception
1.34 paf 159: */
1.21 paf 160: class Pooled {
1.23 paf 161: // the pool i'm allocated on
1.49 paf 162: Pool *fpool;
1.21 paf 163: public:
1.37 paf 164:
165: /// the Pooled-sole: Pooled instances can be allocated in Pool rather then on heap
1.21 paf 166: static void *operator new(size_t size, Pool& apool) {
1.51 parser 167: return apool.malloc(size/*, 1*/);
1.21 paf 168: }
169:
1.49 paf 170: Pooled(Pool& apool) : fpool(&apool) {}
1.23 paf 171:
1.34 paf 172: /// my pool
1.49 paf 173: Pool& pool() const { return *fpool; }
174:
175: /** used for moving objects from one pool to another.
176: in between object can have no pool and can not be used
177: @see SQL_Driver_manager
178: */
179: void set_pool(Pool *apool) { fpool=apool; }
1.21 paf 180:
1.57 parser 181: //{
182: /// @name useful wrapper around pool
1.49 paf 183: void *malloc(size_t size) const { return fpool->malloc(size); }
184: void *calloc(size_t size) const { return fpool->calloc(size); }
1.57 parser 185: void register_cleanup(void (*cleanup) (void *), void *data) { fpool->register_cleanup(cleanup, data); }
1.49 paf 186: Exception& exception() const { return fpool->exception(); }
1.59 parser 187: #ifdef XML
1.57 parser 188: const char *transcode_cstr(const XalanDOMString& s) { return fpool->transcode_cstr(s); }
189: String& transcode(const XalanDOMString& s) { return fpool->transcode(s); }
1.55 parser 190: void _throw(const String *source, const XSLException& e) { fpool->_throw(source, e); }
1.59 parser 191: #endif
1.57 parser 192: //}
1.23 paf 193: };
1.34 paf 194: /// useful macro for creating objects on current Pooled object Pooled::pool()
1.23 paf 195: #define NEW new(pool())
196:
1.35 paf 197: /**
1.34 paf 198: Auto-object used for temporary changing Pool's exception().
199:
200: Use by with these macros:
1.38 paf 201: @code
1.34 paf 202: TRY {
1.38 paf 203: // ...
1.34 paf 204: if(?)
205: THROW(?);
1.38 paf 206: // ...
1.34 paf 207: } CATCH(e) {
1.38 paf 208: // code, using e fields
209: // e.comment()
1.34 paf 210: }
211: END_CATCH
1.38 paf 212: @endcode
213:
214: @see TRY, THROW
1.34 paf 215: */
1.25 paf 216: class Temp_exception {
1.29 paf 217: Pool& fpool;
1.23 paf 218: Exception *saved_exception;
219: public:
1.25 paf 220: Temp_exception(Pool& apool, Exception& exception) :
1.29 paf 221: fpool(apool),
1.23 paf 222: saved_exception(apool.set_exception(&exception)) {
223: }
1.25 paf 224: ~Temp_exception() {
1.29 paf 225: fpool.restore_exception(saved_exception);
1.23 paf 226: }
1.1 paf 227: };
1.23 paf 228:
1.33 paf 229: #define XTRY(pool) \
1.24 paf 230: { \
231: Exception temp_exception; \
1.33 paf 232: Temp_exception le(pool, temp_exception); \
1.24 paf 233: if(setjmp(temp_exception.mark)==0)
1.31 paf 234:
1.33 paf 235: #define XTHROW(exception) exception._throw
236: #define XCATCH(e) \
1.24 paf 237: else{ \
238: Exception& e=temp_exception;
1.31 paf 239:
1.33 paf 240: #define XEND_CATCH \
1.24 paf 241: } \
242: }
1.33 paf 243:
1.34 paf 244: //@{
245: /// @see Temp_exception
1.33 paf 246: #define TRY XTRY(pool())
247: #define THROW XTHROW(exception())
248: #define CATCH(e) XCATCH(e)
249: #define END_CATCH XEND_CATCH
250:
251: #define PTRY XTRY(pool)
252: #define PTHROW XTHROW(pool.exception())
253: #define PCATCH(e) XCATCH(e)
254: #define PEND_CATCH XEND_CATCH
1.34 paf 255: //@}
1.1 paf 256:
257: #endif
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