compiler_8h-source.html

FastDb是高效的内存数据库系统

00221         func.arg[1] = expr2;
00222         func.arg[2] = expr3;
00223         func.fptr = fptr;
00224         type = nodeTypes[cop];
00225     }
00226     ~dbExprNode();
00227 
00228     <span class="keywordtype">void</span>* operator new(size_t size EXTRA_DEBUG_NEW_PARAMS) { 
00229         <span class="keywordflow">return</span> dbExprNodeAllocator::instance.allocate();
00230     }
00231 
00232     <span class="keywordtype">void</span> operator delete(<span class="keywordtype">void</span>* ptr EXTRA_DEBUG_NEW_PARAMS) { 
00233         dbExprNodeAllocator::instance.deallocate((dbExprNode*)ptr);
00234     }
00235 };
00236 
00237 
00238 <span class="keyword">class </span>dbExprNodeSegment { 
00239   <span class="keyword">public</span>:
00240     <span class="keyword">enum</span> { allocationQuantum = 1024};
00241     <span class="keywordtype">char</span>               buf[<span class="keyword">sizeof</span>(dbExprNode)*allocationQuantum];
00242     dbExprNodeSegment* next;
00243 };
00244 
00245 
00246 <span class="keyword">class </span>dbBinding { 
00247   <span class="keyword">public</span>:
00248     dbBinding*  next;
00249     <span class="keywordtype">char</span> <span class="keyword">const</span>* name;
00250     <span class="keywordtype">bool</span>        used;
00251     <span class="keywordtype">int</span>         index;
00252 };
00253 
00254 <span class="keyword">class </span>dbOrderByNode { 
00255   <span class="keyword">public</span>:
00256     dbOrderByNode*     next;
00257     <a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* field;
00258     <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* table;
00259     dbExprNode*        expr;
00260     <span class="keywordtype">bool</span>               ascent;  <span class="comment">// true for ascent order, false for descent </span>
00261 };
00262 
00263 <span class="keyword">class </span>dbFollowByNode { 
00264   <span class="keyword">public</span>:
00265     dbFollowByNode*    next;
00266     <a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* field;
00267 };
00268 
00269 <span class="keyword">class </span>FASTDB_DLL_ENTRY dbCompiler { 
00270     <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classdbQuery.html">dbQuery</a>;
00271     <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classdbQueryElement.html">dbQueryElement</a>;
00272   <span class="keyword">public</span>:
00273     <span class="keyword">enum</span> { 
00274         maxStrLen    = 4096,
00275         maxFreeVars  = 4
00276     };
00277 
00278     <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* table;
00279     <a class="code" href="classdbQueryElement.html">dbQueryElement</a>*    queryElement;
00280     <span class="keywordtype">int</span>                currPos;
00281     <span class="keywordtype">int</span>                firstPos;
00282     <span class="keywordtype">int</span>                offsetWithinStatement;
00283     <span class="keywordtype">int</span>                bvalue;
00284     db_int8               ivalue;
00285     real8              fvalue;
00286     dbStrLiteral       svalue;
00287     <span class="keywordtype">bool</span>               hasToken;
00288     <span class="keywordtype">int</span>                lex;
00289     <span class="keywordtype">char</span>*              name;
00290     dbBinding*         bindings;
00291     <span class="keywordtype">int</span>                nFreeVars;
00292     <span class="keywordtype">int</span>                varType;
00293     <span class="keywordtype">void</span> <span class="keyword">const</span>*        varPtr;
00294     <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* varRefTable;
00295 
00296     jmp_buf            abortCompilation;
00297     <span class="keyword">static</span> <span class="keywordtype">bool</span>        initialized;
00298 
00299     <span class="keywordtype">int</span>         compare(dbExprNode* expr, dbExprNode* list);
00300 
00301     <span class="keywordtype">int</span>         scan();
00302     <span class="keywordtype">void</span>        ungetToken(<span class="keywordtype">int</span> tkn) {
00303         lex = tkn;
00304         hasToken = <span class="keyword">true</span>;
00305     }
00306     <span class="keywordtype">void</span>        error(<span class="keyword">const</span> <span class="keywordtype">char</span>* msg, <span class="keywordtype">int</span> pos = -1);
00307     dbExprNode* conjunction();    
00308     dbExprNode* disjunction();
00309     dbExprNode* comparison();    
00310     dbExprNode* addition();    
00311     dbExprNode* multiplication();    
00312     dbExprNode* power();
00313     dbExprNode* term();
00314     dbExprNode* userDefinedOperator();
00315     dbExprNode* field(dbExprNode* expr, <a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* refTable,
00316                       <a class="code" href="classdbFieldDescriptor.html">dbFieldDescriptor</a>* fd);
00317 
00318     <span class="keywordtype">bool</span>        compile(<a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* table, <a class="code" href="classdbQuery.html">dbQuery</a>&amp; query);
00319     dbExprNode* compileExpression(<a class="code" href="classdbTableDescriptor.html">dbTableDescriptor</a>* table,  <span class="keywordtype">char</span> <span class="keyword">const</span>* expr, <span class="keywordtype">int</span> startPos);
00320     <span class="keywordtype">void</span>        compileOrderByPart(<a class="code" href="classdbQuery.html">dbQuery</a>&amp; query);
00321     <span class="keywordtype">void</span>        compileStartFollowPart(<a class="code" href="classdbQuery.html">dbQuery</a>&amp; query);
00322 
00323     dbCompiler();
00324 };
00325 
00326 <span class="keyword">class </span>dbDatabaseThreadContext : <span class="keyword">public</span> <a class="code" href="classdbL2List.html">dbL2List</a> { 
00327   <span class="keyword">public</span>:
00328     <span class="keywordtype">int</span> readAccess;
00329     <span class="keywordtype">int</span> writeAccess;
00330     <span class="keywordtype">int</span> concurrentId;
00331     <span class="keywordtype">int</span> mutatorCSLocked;
00332 
00333     <a class="code" href="classdbL2List.html">dbL2List</a> cursors; 
00334     
00335     dbCompiler compiler;
00336 
00337     dbProcessId currPid;
00338 
00339     <span class="keywordtype">bool</span>     interactive;
00340     <span class="keywordtype">bool</span>     catched;
00341     <span class="keywordtype">bool</span>     commitDelayed;
00342     <span class="keywordtype">bool</span>     removeContext;
00343     jmp_buf  unwind;
00344     
00345     dbDatabaseThreadContext() { 
00346         concurrentId = 0;
00347         readAccess = <span class="keyword">false</span>;
00348         writeAccess = <span class="keyword">false</span>;
00349         mutatorCSLocked = <span class="keyword">false</span>;
00350         interactive = <span class="keyword">false</span>;
00351         catched = <span class="keyword">false</span>;
00352         commitDelayed = <span class="keyword">false</span>;
00353         removeContext = <span class="keyword">false</span>;
00354         currPid = dbProcessId::getCurrent();
00355     }
00356 };
00357 
00358 <span class="keyword">union </span>dbSynthesizedAttribute { 
00359     byte*   base;
00360     <span class="keywordtype">int</span>     bvalue;
00361     db_int8 ivalue;
00362     real8   fvalue;
00363     <span class="keywordtype">void</span>*   raw;
00364     oid_t   oid;
00365 
00366     <span class="keyword">struct </span>{ 
00367         <span class="keywordtype">char</span>* base;
00368         <span class="keywordtype">int</span>   size;
00369     } array;
00370 };
00371 
00372 <span class="keyword">struct </span>dbStringValue;
00373 
00374 <span class="keyword">struct </span>FASTDB_DLL_ENTRY dbInheritedAttribute { 
00375     byte*          record;
00376     oid_t          oid;
00377     <a class="code" href="classdbTable.html">dbTable</a>*       table;
00378     <a class="code" href="classdbDatabase.html">dbDatabase</a>*    db;
00379     dbStringValue* tempStrings;
00380     size_t         paramBase;
00381     <span class="keyword">enum</span> { 
00382         internalStrBufSize = 8*1024 
00383     };
00384     size_t         strBufPos;
00385     <span class="keywordtype">char</span>           strBuf[internalStrBufSize];
00386     
00387     <span class="keyword">struct </span>{ 
00388         <span class="keywordtype">int</span>     index;
00389         jmp_buf unwind;
00390     } exists_iterator[dbCompiler::maxFreeVars];
00391 
00392     <span class="keywordtype">void</span> removeTemporaries();
00393 
00394     dbInheritedAttribute() { 
00395         tempStrings = NULL;
00396         strBufPos = 0;
00397     }
00398 
00399     ~dbInheritedAttribute() { 
00400         removeTemporaries(); 
00401     }
00402 };
00403 
00404 <span class="keyword">struct </span>dbStringValue { 
00405     dbStringValue* next;
00406     <span class="keywordtype">char</span>           str[1];
00407 
00408     <span class="keyword">static</span> <span class="keywordtype">char</span>* create(size_t size, dbInheritedAttribute&amp; attr) { 
00409         <span class="keywordflow">if</span> (attr.strBufPos + size &gt; <span class="keyword">sizeof</span>(attr.strBuf)) { 
00410             dbStringValue* sv = 
00411                 (dbStringValue*)<span class="keyword">new</span> <span class="keywordtype">char</span>[offsetof(dbStringValue, str) + size];
00412             sv-&gt;next = attr.tempStrings;
00413             attr.tempStrings = sv;
00414             <span class="keywordflow">return</span> sv-&gt;str;
00415         } <span class="keywordflow">else</span> { 
00416             <span class="keywordtype">char</span>* p = attr.strBuf + attr.strBufPos;
00417             attr.strBufPos += size;
00418             <span class="keywordflow">return</span> p;
00419         }
00420     }
00421 
00422     <span class="keyword">static</span> <span class="keywordtype">char</span>* create(<span class="keywordtype">char</span> <span class="keyword">const</span>* s, dbInheritedAttribute&amp; attr) {
00423         size_t len = strlen(s) + 1;
00424         <span class="keywordtype">char</span>*  buf;
00425         <span class="keywordflow">if</span> (attr.strBufPos + len &gt; <span class="keyword">sizeof</span>(attr.strBuf)) { 
00426             dbStringValue* sv = 
00427                 (dbStringValue*)<span class="keyword">new</span> <span class="keywordtype">char</span>[offsetof(dbStringValue,str)+len];
00428             sv-&gt;next = attr.tempStrings;
00429             attr.tempStrings = sv;
00430             buf = sv-&gt;str;
00431         } <span class="keywordflow">else</span> { 
00432             buf = attr.strBuf + attr.strBufPos;
00433             attr.strBufPos += len;
00434         }
00435         <span class="keywordflow">return</span> strcpy(buf, s);
00436     }
00437 };
00438     
00439 <span class="preprocessor">#endif</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Feb 12 13:04:48 2004 for FastDB by
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