Annotation of parser3/src/include/pa_pool.h, revision 1.79
1.34 paf 1: /** @file
1.36 paf 2: Parser: pool class decl.
3:
1.77 paf 4: Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
1.36 paf 5:
1.78 paf 6: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.27 paf 7:
1.79 ! paf 8: $Id: pa_pool.h,v 1.78 2002/02/08 08:30:13 paf 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
1.75 paf 17: # include "gdome.h"
1.76 paf 18: // for xmlChar
19: # include "libxml/tree.h"
1.59 parser 20: #endif
1.55 parser 21:
22: // forwards
23:
1.21 paf 24: class Exception;
1.55 parser 25: class String;
1.73 paf 26: class Charset;
1.75 paf 27: class GdomeDOMString_auto_ptr;
1.55 parser 28:
1.35 paf 29: /**
1.34 paf 30: Pool mechanizm allows users not to free up allocated memory,
31: leaving that problem to 'pools'.
32:
1.38 paf 33: @see Pooled
1.34 paf 34: */
1.47 paf 35:
1.1 paf 36: class Pool {
37: public:
1.18 paf 38:
1.55 parser 39: Pool(void *astorage);
1.18 paf 40:
1.79 ! paf 41: //{@ statistics
1.70 paf 42: size_t total_allocated() { return ftotal_allocated; }
43: unsigned int total_times() { return ftotal_times; }
1.79 ! paf 44: //}@
1.70 paf 45:
1.40 paf 46: void set_context(void *acontext) { fcontext=acontext; }
1.64 parser 47: void *get_context() { return fcontext; }
1.39 paf 48:
1.34 paf 49: /// allocates some bytes on pool
1.68 paf 50: void *malloc(size_t size, int place=0) {
51: return check(real_malloc(size, place), size);
1.18 paf 52: }
1.34 paf 53: /// allocates some bytes clearing them with zeros
1.18 paf 54: void *calloc(size_t size) {
55: return check(real_calloc(size), size);
56: }
1.39 paf 57:
1.53 parser 58: /// registers a routine to clean up non-pooled allocations
1.54 parser 59: void register_cleanup(void (*cleanup) (void *), void *data) {
60: if(!real_register_cleanup(cleanup, data))
61: fail_register_cleanup();
62: }
1.53 parser 63:
1.79 ! paf 64: //{@ source charset
1.73 paf 65: void set_source_charset(Charset& acharset);
66: Charset& get_source_charset();
1.79 ! paf 67: //}@
1.73 paf 68:
1.79 ! paf 69: //{@ client charset
1.73 paf 70: void set_client_charset(Charset& charset);
71: Charset& get_client_charset();
1.79 ! paf 72: //}@
1.73 paf 73:
74: #ifdef XML
1.74 paf 75:
1.76 paf 76: /// @see Charset::transcode_cstr(xmlChar *s);
77: const char *transcode_cstr(xmlChar *s);
78: /// @see Charset::transcode(xmlChar *s);
79: String& transcode(xmlChar *s);
80: /// @see Charset::transcode_cstr(GdomeDOMString *s);
1.74 paf 81: const char *transcode_cstr(GdomeDOMString *s);
1.76 paf 82: /// @see Charset::transcode(GdomeDOMString *s);
1.74 paf 83: String& transcode(GdomeDOMString *s);
1.73 paf 84: /// @see Charset::transcode(const String& s)
1.75 paf 85: GdomeDOMString_auto_ptr transcode(const String& s);
1.74 paf 86:
1.73 paf 87: #endif
1.60 parser 88:
1.39 paf 89: private:
90:
91: void *fstorage;
1.40 paf 92: void *fcontext;
1.73 paf 93: Charset *source_charset;
94: Charset *client_charset;
1.8 paf 95:
1.50 parser 96: private:
97:
98: //{
99: /// @name implementation defined
1.68 paf 100: void *real_malloc(size_t size, int place);
1.20 paf 101: void *real_calloc(size_t size);
1.54 parser 102: bool real_register_cleanup(void (*cleanup) (void *), void *data);
1.50 parser 103: //}
1.17 paf 104:
1.23 paf 105: private:
1.17 paf 106:
1.34 paf 107: /// checks whether mem allocated OK. throws exception otherwise
1.23 paf 108: void *check(void *ptr, size_t size) {
1.70 paf 109: if(ptr) {
110: ftotal_allocated+=size;
111: ftotal_times++;
1.23 paf 112: return ptr;
1.70 paf 113: }
1.23 paf 114:
1.54 parser 115: fail_alloc(size);
1.23 paf 116:
117: // never reached
118: return 0;
119: }
1.54 parser 120: /// throws allocation exception
121: void fail_alloc(size_t size) const;
122:
123: /// throws register cleanup exception
124: void fail_register_cleanup() const;
1.70 paf 125:
126: private: // statistics
127:
128: size_t ftotal_allocated;
129: unsigned int ftotal_times;
1.59 parser 130:
1.8 paf 131: private: //disabled
132:
1.64 parser 133: Pool(const Pool&);
134: Pool& operator= (const Pool&);
1.21 paf 135: };
136:
1.35 paf 137: /**
1.34 paf 138: Base for all classes that are allocated in 'pools'.
139:
140: Holds Pool object. Contains useful wrappers to it's methods.
1.38 paf 141:
1.64 parser 142: @see NEW
1.34 paf 143: */
1.21 paf 144: class Pooled {
1.23 paf 145: // the pool i'm allocated on
1.49 paf 146: Pool *fpool;
1.21 paf 147: public:
1.37 paf 148:
149: /// the Pooled-sole: Pooled instances can be allocated in Pool rather then on heap
1.21 paf 150: static void *operator new(size_t size, Pool& apool) {
1.68 paf 151: return apool.malloc(size, 1);
1.21 paf 152: }
153:
1.49 paf 154: Pooled(Pool& apool) : fpool(&apool) {}
1.23 paf 155:
1.34 paf 156: /// my pool
1.49 paf 157: Pool& pool() const { return *fpool; }
158:
159: /** used for moving objects from one pool to another.
160: in between object can have no pool and can not be used
161: @see SQL_Driver_manager
162: */
163: void set_pool(Pool *apool) { fpool=apool; }
1.21 paf 164:
1.57 parser 165: //{
166: /// @name useful wrapper around pool
1.68 paf 167: void *malloc(size_t size, int place=0) const { return fpool->malloc(size, place); }
1.49 paf 168: void *calloc(size_t size) const { return fpool->calloc(size); }
1.57 parser 169: void register_cleanup(void (*cleanup) (void *), void *data) { fpool->register_cleanup(cleanup, data); }
1.59 parser 170: #ifdef XML
1.74 paf 171:
172: const char *transcode_cstr(GdomeDOMString *s) { return fpool->transcode_cstr(s); }
173: String& transcode(GdomeDOMString *s) { return fpool->transcode(s); }
174:
1.59 parser 175: #endif
1.57 parser 176: //}
1.23 paf 177: };
1.34 paf 178: /// useful macro for creating objects on current Pooled object Pooled::pool()
1.23 paf 179: #define NEW new(pool())
1.1 paf 180:
181: #endif
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