diff options
Diffstat (limited to 'ext/pdo_sqlite/sqlite/src/vdbe.c')
| -rw-r--r-- | ext/pdo_sqlite/sqlite/src/vdbe.c | 4692 |
1 files changed, 0 insertions, 4692 deletions
diff --git a/ext/pdo_sqlite/sqlite/src/vdbe.c b/ext/pdo_sqlite/sqlite/src/vdbe.c deleted file mode 100644 index fe44eed405..0000000000 --- a/ext/pdo_sqlite/sqlite/src/vdbe.c +++ /dev/null @@ -1,4692 +0,0 @@ -/* -** 2001 September 15 -** -** The author disclaims copyright to this source code. In place of -** a legal notice, here is a blessing: -** -** May you do good and not evil. -** May you find forgiveness for yourself and forgive others. -** May you share freely, never taking more than you give. -** -************************************************************************* -** The code in this file implements execution method of the -** Virtual Database Engine (VDBE). A separate file ("vdbeaux.c") -** handles housekeeping details such as creating and deleting -** VDBE instances. This file is solely interested in executing -** the VDBE program. -** -** In the external interface, an "sqlite3_stmt*" is an opaque pointer -** to a VDBE. -** -** The SQL parser generates a program which is then executed by -** the VDBE to do the work of the SQL statement. VDBE programs are -** similar in form to assembly language. The program consists of -** a linear sequence of operations. Each operation has an opcode -** and 3 operands. Operands P1 and P2 are integers. Operand P3 -** is a null-terminated string. The P2 operand must be non-negative. -** Opcodes will typically ignore one or more operands. Many opcodes -** ignore all three operands. -** -** Computation results are stored on a stack. Each entry on the -** stack is either an integer, a null-terminated string, a floating point -** number, or the SQL "NULL" value. An inplicit conversion from one -** type to the other occurs as necessary. -** -** Most of the code in this file is taken up by the sqlite3VdbeExec() -** function which does the work of interpreting a VDBE program. -** But other routines are also provided to help in building up -** a program instruction by instruction. -** -** Various scripts scan this source file in order to generate HTML -** documentation, headers files, or other derived files. The formatting -** of the code in this file is, therefore, important. See other comments -** in this file for details. If in doubt, do not deviate from existing -** commenting and indentation practices when changing or adding code. -** -** $Id$ -*/ -#include "sqliteInt.h" -#include "os.h" -#include <ctype.h> -#include "vdbeInt.h" - -/* -** The following global variable is incremented every time a cursor -** moves, either by the OP_MoveXX, OP_Next, or OP_Prev opcodes. The test -** procedures use this information to make sure that indices are -** working correctly. This variable has no function other than to -** help verify the correct operation of the library. -*/ -int sqlite3_search_count = 0; - -/* -** When this global variable is positive, it gets decremented once before -** each instruction in the VDBE. When reaches zero, the SQLITE_Interrupt -** of the db.flags field is set in order to simulate and interrupt. -** -** This facility is used for testing purposes only. It does not function -** in an ordinary build. -*/ -int sqlite3_interrupt_count = 0; - -/* -** The next global variable is incremented each type the OP_Sort opcode -** is executed. The test procedures use this information to make sure that -** sorting is occurring or not occuring at appropriate times. This variable -** has no function other than to help verify the correct operation of the -** library. -*/ -int sqlite3_sort_count = 0; - -/* -** Release the memory associated with the given stack level. This -** leaves the Mem.flags field in an inconsistent state. -*/ -#define Release(P) if((P)->flags&MEM_Dyn){ sqlite3VdbeMemRelease(P); } - -/* -** Convert the given stack entity into a string if it isn't one -** already. Return non-zero if a malloc() fails. -*/ -#define Stringify(P, enc) \ - if(((P)->flags&(MEM_Str|MEM_Blob))==0 && sqlite3VdbeMemStringify(P,enc)) \ - { goto no_mem; } - -/* -** Convert the given stack entity into a string that has been obtained -** from sqliteMalloc(). This is different from Stringify() above in that -** Stringify() will use the NBFS bytes of static string space if the string -** will fit but this routine always mallocs for space. -** Return non-zero if we run out of memory. -*/ -#define Dynamicify(P,enc) sqlite3VdbeMemDynamicify(P) - - -/* -** An ephemeral string value (signified by the MEM_Ephem flag) contains -** a pointer to a dynamically allocated string where some other entity -** is responsible for deallocating that string. Because the stack entry -** does not control the string, it might be deleted without the stack -** entry knowing it. -** -** This routine converts an ephemeral string into a dynamically allocated -** string that the stack entry itself controls. In other words, it -** converts an MEM_Ephem string into an MEM_Dyn string. -*/ -#define Deephemeralize(P) \ - if( ((P)->flags&MEM_Ephem)!=0 \ - && sqlite3VdbeMemMakeWriteable(P) ){ goto no_mem;} - -/* -** Convert the given stack entity into a integer if it isn't one -** already. -** -** Any prior string or real representation is invalidated. -** NULLs are converted into 0. -*/ -#define Integerify(P) sqlite3VdbeMemIntegerify(P) - -/* -** Convert P so that it has type MEM_Real. -** -** Any prior string or integer representation is invalidated. -** NULLs are converted into 0.0. -*/ -#define Realify(P) sqlite3VdbeMemRealify(P) - -/* -** Argument pMem points at a memory cell that will be passed to a -** user-defined function or returned to the user as the result of a query. -** The second argument, 'db_enc' is the text encoding used by the vdbe for -** stack variables. This routine sets the pMem->enc and pMem->type -** variables used by the sqlite3_value_*() routines. -*/ -#define storeTypeInfo(A,B) _storeTypeInfo(A) -static void _storeTypeInfo(Mem *pMem){ - int flags = pMem->flags; - if( flags & MEM_Null ){ - pMem->type = SQLITE_NULL; - } - else if( flags & MEM_Int ){ - pMem->type = SQLITE_INTEGER; - } - else if( flags & MEM_Real ){ - pMem->type = SQLITE_FLOAT; - } - else if( flags & MEM_Str ){ - pMem->type = SQLITE_TEXT; - }else{ - pMem->type = SQLITE_BLOB; - } -} - -/* -** Insert a new aggregate element and make it the element that -** has focus. -** -** Return 0 on success and 1 if memory is exhausted. -*/ -static int AggInsert(Agg *p, char *zKey, int nKey){ - AggElem *pElem; - int i; - int rc; - pElem = sqliteMalloc( sizeof(AggElem) + nKey + - (p->nMem-1)*sizeof(pElem->aMem[0]) ); - if( pElem==0 ) return SQLITE_NOMEM; - pElem->zKey = (char*)&pElem->aMem[p->nMem]; - memcpy(pElem->zKey, zKey, nKey); - pElem->nKey = nKey; - - if( p->pCsr ){ - rc = sqlite3BtreeInsert(p->pCsr, zKey, nKey, &pElem, sizeof(AggElem*)); - if( rc!=SQLITE_OK ){ - sqliteFree(pElem); - return rc; - } - } - - for(i=0; i<p->nMem; i++){ - pElem->aMem[i].flags = MEM_Null; - } - p->pCurrent = pElem; - return 0; -} - -/* -** Pop the stack N times. -*/ -static void popStack(Mem **ppTos, int N){ - Mem *pTos = *ppTos; - while( N>0 ){ - N--; - Release(pTos); - pTos--; - } - *ppTos = pTos; -} - -/* -** The parameters are pointers to the head of two sorted lists -** of Sorter structures. Merge these two lists together and return -** a single sorted list. This routine forms the core of the merge-sort -** algorithm. -** -** In the case of a tie, left sorts in front of right. -*/ -static Sorter *Merge(Sorter *pLeft, Sorter *pRight, KeyInfo *pKeyInfo){ - Sorter sHead; - Sorter *pTail; - pTail = &sHead; - pTail->pNext = 0; - while( pLeft && pRight ){ - int c = sqlite3VdbeRecordCompare(pKeyInfo, pLeft->nKey, pLeft->zKey, - pRight->nKey, pRight->zKey); - if( c<=0 ){ - pTail->pNext = pLeft; - pLeft = pLeft->pNext; - }else{ - pTail->pNext = pRight; - pRight = pRight->pNext; - } - pTail = pTail->pNext; - } - if( pLeft ){ - pTail->pNext = pLeft; - }else if( pRight ){ - pTail->pNext = pRight; - } - return sHead.pNext; -} - -/* -** Allocate cursor number iCur. Return a pointer to it. Return NULL -** if we run out of memory. -*/ -static Cursor *allocateCursor(Vdbe *p, int iCur){ - Cursor *pCx; - assert( iCur<p->nCursor ); - if( p->apCsr[iCur] ){ - sqlite3VdbeFreeCursor(p->apCsr[iCur]); - } - p->apCsr[iCur] = pCx = sqliteMalloc( sizeof(Cursor) ); - return pCx; -} - -/* -** Apply any conversion required by the supplied column affinity to -** memory cell pRec. affinity may be one of: -** -** SQLITE_AFF_NUMERIC -** SQLITE_AFF_TEXT -** SQLITE_AFF_NONE -** SQLITE_AFF_INTEGER -** -*/ -static void applyAffinity(Mem *pRec, char affinity, u8 enc){ - if( affinity==SQLITE_AFF_NONE ){ - /* do nothing */ - }else if( affinity==SQLITE_AFF_TEXT ){ - /* Only attempt the conversion to TEXT if there is an integer or real - ** representation (blob and NULL do not get converted) but no string - ** representation. - */ - if( 0==(pRec->flags&MEM_Str) && (pRec->flags&(MEM_Real|MEM_Int)) ){ - sqlite3VdbeMemStringify(pRec, enc); - } - pRec->flags &= ~(MEM_Real|MEM_Int); - }else{ - if( 0==(pRec->flags&(MEM_Real|MEM_Int)) ){ - /* pRec does not have a valid integer or real representation. - ** Attempt a conversion if pRec has a string representation and - ** it looks like a number. - */ - int realnum; - sqlite3VdbeMemNulTerminate(pRec); - if( pRec->flags&MEM_Str && sqlite3IsNumber(pRec->z, &realnum, enc) ){ - if( realnum ){ - Realify(pRec); - }else{ - Integerify(pRec); - } - } - } - - if( affinity==SQLITE_AFF_INTEGER ){ - /* For INTEGER affinity, try to convert a real value to an int */ - if( (pRec->flags&MEM_Real) && !(pRec->flags&MEM_Int) ){ - pRec->i = pRec->r; - if( ((double)pRec->i)==pRec->r ){ - pRec->flags |= MEM_Int; - } - } - } - } -} - -/* -** Exported version of applyAffinity(). This one works on sqlite3_value*, -** not the internal Mem* type. -*/ -void sqlite3ValueApplyAffinity(sqlite3_value *pVal, u8 affinity, u8 enc){ - applyAffinity((Mem *)pVal, affinity, enc); -} - -#ifdef SQLITE_DEBUG -/* -** Write a nice string representation of the contents of cell pMem -** into buffer zBuf, length nBuf. -*/ -void sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf, int nBuf){ - char *zCsr = zBuf; - int f = pMem->flags; - - static const char *const encnames[] = {"(X)", "(8)", "(16LE)", "(16BE)"}; - - if( f&MEM_Blob ){ - int i; - char c; - if( f & MEM_Dyn ){ - c = 'z'; - assert( (f & (MEM_Static|MEM_Ephem))==0 ); - }else if( f & MEM_Static ){ - c = 't'; - assert( (f & (MEM_Dyn|MEM_Ephem))==0 ); - }else if( f & MEM_Ephem ){ - c = 'e'; - assert( (f & (MEM_Static|MEM_Dyn))==0 ); - }else{ - c = 's'; - } - - zCsr += sprintf(zCsr, "%c", c); - zCsr += sprintf(zCsr, "%d[", pMem->n); - for(i=0; i<16 && i<pMem->n; i++){ - zCsr += sprintf(zCsr, "%02X ", ((int)pMem->z[i] & 0xFF)); - } - for(i=0; i<16 && i<pMem->n; i++){ - char z = pMem->z[i]; - if( z<32 || z>126 ) *zCsr++ = '.'; - else *zCsr++ = z; - } - - zCsr += sprintf(zCsr, "]"); - *zCsr = '\0'; - }else if( f & MEM_Str ){ - int j, k; - zBuf[0] = ' '; - if( f & MEM_Dyn ){ - zBuf[1] = 'z'; - assert( (f & (MEM_Static|MEM_Ephem))==0 ); - }else if( f & MEM_Static ){ - zBuf[1] = 't'; - assert( (f & (MEM_Dyn|MEM_Ephem))==0 ); - }else if( f & MEM_Ephem ){ - zBuf[1] = 'e'; - assert( (f & (MEM_Static|MEM_Dyn))==0 ); - }else{ - zBuf[1] = 's'; - } - k = 2; - k += sprintf(&zBuf[k], "%d", pMem->n); - zBuf[k++] = '['; - for(j=0; j<15 && j<pMem->n; j++){ - u8 c = pMem->z[j]; - if( c>=0x20 && c<0x7f ){ - zBuf[k++] = c; - }else{ - zBuf[k++] = '.'; - } - } - zBuf[k++] = ']'; - k += sprintf(&zBuf[k], encnames[pMem->enc]); - zBuf[k++] = 0; - } -} -#endif - - -#ifdef VDBE_PROFILE -/* -** The following routine only works on pentium-class processors. -** It uses the RDTSC opcode to read the cycle count value out of the -** processor and returns that value. This can be used for high-res -** profiling. -*/ -__inline__ unsigned long long int hwtime(void){ - unsigned long long int x; - __asm__("rdtsc\n\t" - "mov %%edx, %%ecx\n\t" - :"=A" (x)); - return x; -} -#endif - -/* -** The CHECK_FOR_INTERRUPT macro defined here looks to see if the -** sqlite3_interrupt() routine has been called. If it has been, then -** processing of the VDBE program is interrupted. -** -** This macro added to every instruction that does a jump in order to -** implement a loop. This test used to be on every single instruction, -** but that meant we more testing that we needed. By only testing the -** flag on jump instructions, we get a (small) speed improvement. -*/ -#define CHECK_FOR_INTERRUPT \ - if( db->flags & SQLITE_Interrupt ) goto abort_due_to_interrupt; - - -/* -** Execute as much of a VDBE program as we can then return. -** -** sqlite3VdbeMakeReady() must be called before this routine in order to -** close the program with a final OP_Halt and to set up the callbacks -** and the error message pointer. -** -** Whenever a row or result data is available, this routine will either -** invoke the result callback (if there is one) or return with -** SQLITE_ROW. -** -** If an attempt is made to open a locked database, then this routine -** will either invoke the busy callback (if there is one) or it will -** return SQLITE_BUSY. -** -** If an error occurs, an error message is written to memory obtained -** from sqliteMalloc() and p->zErrMsg is made to point to that memory. -** The error code is stored in p->rc and this routine returns SQLITE_ERROR. -** -** If the callback ever returns non-zero, then the program exits -** immediately. There will be no error message but the p->rc field is -** set to SQLITE_ABORT and this routine will return SQLITE_ERROR. -** -** A memory allocation error causes p->rc to be set to SQLITE_NOMEM and this -** routine to return SQLITE_ERROR. -** -** Other fatal errors return SQLITE_ERROR. -** -** After this routine has finished, sqlite3VdbeFinalize() should be -** used to clean up the mess that was left behind. -*/ -int sqlite3VdbeExec( - Vdbe *p /* The VDBE */ -){ - int pc; /* The program counter */ - Op *pOp; /* Current operation */ - int rc = SQLITE_OK; /* Value to return */ - sqlite3 *db = p->db; /* The database */ - Mem *pTos; /* Top entry in the operand stack */ - char zBuf[100]; /* Space to sprintf() an integer */ -#ifdef VDBE_PROFILE - unsigned long long start; /* CPU clock count at start of opcode */ - int origPc; /* Program counter at start of opcode */ -#endif -#ifndef SQLITE_OMIT_PROGRESS_CALLBACK - int nProgressOps = 0; /* Opcodes executed since progress callback. */ -#endif -#ifndef NDEBUG - Mem *pStackLimit; -#endif - - if( p->magic!=VDBE_MAGIC_RUN ) return SQLITE_MISUSE; - assert( db->magic==SQLITE_MAGIC_BUSY ); - assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY ); - p->rc = SQLITE_OK; - assert( p->explain==0 ); - pTos = p->pTos; - if( sqlite3_malloc_failed ) goto no_mem; - if( p->popStack ){ - popStack(&pTos, p->popStack); - p->popStack = 0; - } - p->resOnStack = 0; - CHECK_FOR_INTERRUPT; - for(pc=p->pc; rc==SQLITE_OK; pc++){ - assert( pc>=0 && pc<p->nOp ); - assert( pTos<=&p->aStack[pc] ); - if( sqlite3_malloc_failed ) goto no_mem; -#ifdef VDBE_PROFILE - origPc = pc; - start = hwtime(); -#endif - pOp = &p->aOp[pc]; - - /* Only allow tracing if SQLITE_DEBUG is defined. - */ -#ifdef SQLITE_DEBUG - if( p->trace ){ - if( pc==0 ){ - printf("VDBE Execution Trace:\n"); - sqlite3VdbePrintSql(p); - } - sqlite3VdbePrintOp(p->trace, pc, pOp); - } - if( p->trace==0 && pc==0 && sqlite3OsFileExists("vdbe_sqltrace") ){ - sqlite3VdbePrintSql(p); - } -#endif - - - /* Check to see if we need to simulate an interrupt. This only happens - ** if we have a special test build. - */ -#ifdef SQLITE_TEST - if( sqlite3_interrupt_count>0 ){ - sqlite3_interrupt_count--; - if( sqlite3_interrupt_count==0 ){ - sqlite3_interrupt(db); - } - } -#endif - -#ifndef SQLITE_OMIT_PROGRESS_CALLBACK - /* Call the progress callback if it is configured and the required number - ** of VDBE ops have been executed (either since this invocation of - ** sqlite3VdbeExec() or since last time the progress callback was called). - ** If the progress callback returns non-zero, exit the virtual machine with - ** a return code SQLITE_ABORT. - */ - if( db->xProgress ){ - if( db->nProgressOps==nProgressOps ){ - if( db->xProgress(db->pProgressArg)!=0 ){ - rc = SQLITE_ABORT; - continue; /* skip to the next iteration of the for loop */ - } - nProgressOps = 0; - } - nProgressOps++; - } -#endif - -#ifndef NDEBUG - /* This is to check that the return value of static function - ** opcodeNoPush() (see vdbeaux.c) returns values that match the - ** implementation of the virtual machine in this file. If - ** opcodeNoPush() returns non-zero, then the stack is guarenteed - ** not to grow when the opcode is executed. If it returns zero, then - ** the stack may grow by at most 1. - ** - ** The global wrapper function sqlite3VdbeOpcodeUsesStack() is not - ** available if NDEBUG is defined at build time. - */ - pStackLimit = pTos; - if( !sqlite3VdbeOpcodeNoPush(pOp->opcode) ){ - pStackLimit++; - } -#endif - - switch( pOp->opcode ){ - -/***************************************************************************** -** What follows is a massive switch statement where each case implements a -** separate instruction in the virtual machine. If we follow the usual -** indentation conventions, each case should be indented by 6 spaces. But -** that is a lot of wasted space on the left margin. So the code within -** the switch statement will break with convention and be flush-left. Another -** big comment (similar to this one) will mark the point in the code where -** we transition back to normal indentation. -** -** The formatting of each case is important. The makefile for SQLite -** generates two C files "opcodes.h" and "opcodes.c" by scanning this -** file looking for lines that begin with "case OP_". The opcodes.h files -** will be filled with #defines that give unique integer values to each -** opcode and the opcodes.c file is filled with an array of strings where -** each string is the symbolic name for the corresponding opcode. If the -** case statement is followed by a comment of the form "/# same as ... #/" -** that comment is used to determine the particular value of the opcode. -** -** If a comment on the same line as the "case OP_" construction contains -** the word "no-push", then the opcode is guarenteed not to grow the -** vdbe stack when it is executed. See function opcode() in -** vdbeaux.c for details. -** -** Documentation about VDBE opcodes is generated by scanning this file -** for lines of that contain "Opcode:". That line and all subsequent -** comment lines are used in the generation of the opcode.html documentation -** file. -** -** SUMMARY: -** -** Formatting is important to scripts that scan this file. -** Do not deviate from the formatting style currently in use. -** -*****************************************************************************/ - -/* Opcode: Goto * P2 * -** -** An unconditional jump to address P2. -** The next instruction executed will be -** the one at index P2 from the beginning of -** the program. -*/ -case OP_Goto: { /* no-push */ - CHECK_FOR_INTERRUPT; - pc = pOp->p2 - 1; - break; -} - -/* Opcode: Gosub * P2 * -** -** Push the current address plus 1 onto the return address stack -** and then jump to address P2. -** -** The return address stack is of limited depth. If too many -** OP_Gosub operations occur without intervening OP_Returns, then -** the return address stack will fill up and processing will abort -** with a fatal error. -*/ -case OP_Gosub: { /* no-push */ - assert( p->returnDepth<sizeof(p->returnStack)/sizeof(p->returnStack[0]) ); - p->returnStack[p->returnDepth++] = pc+1; - pc = pOp->p2 - 1; - break; -} - -/* Opcode: Return * * * -** -** Jump immediately to the next instruction after the last unreturned -** OP_Gosub. If an OP_Return has occurred for all OP_Gosubs, then -** processing aborts with a fatal error. -*/ -case OP_Return: { /* no-push */ - assert( p->returnDepth>0 ); - p->returnDepth--; - pc = p->returnStack[p->returnDepth] - 1; - break; -} - -/* Opcode: Halt P1 P2 * -** -** Exit immediately. All open cursors, Lists, Sorts, etc are closed -** automatically. -** -** P1 is the result code returned by sqlite3_exec(), sqlite3_reset(), -** or sqlite3_finalize(). For a normal halt, this should be SQLITE_OK (0). -** For errors, it can be some other value. If P1!=0 then P2 will determine -** whether or not to rollback the current transaction. Do not rollback -** if P2==OE_Fail. Do the rollback if P2==OE_Rollback. If P2==OE_Abort, -** then back out all changes that have occurred during this execution of the -** VDBE, but do not rollback the transaction. -** -** There is an implied "Halt 0 0 0" instruction inserted at the very end of -** every program. So a jump past the last instruction of the program -** is the same as executing Halt. -*/ -case OP_Halt: { /* no-push */ - p->pTos = pTos; - p->rc = pOp->p1; - p->pc = pc; - p->errorAction = pOp->p2; - if( pOp->p3 ){ - sqlite3SetString(&p->zErrMsg, pOp->p3, (char*)0); - } - rc = sqlite3VdbeHalt(p); - assert( rc==SQLITE_BUSY || rc==SQLITE_OK ); - if( rc==SQLITE_BUSY ){ - p->rc = SQLITE_BUSY; - return SQLITE_BUSY; - } - return p->rc ? SQLITE_ERROR : SQLITE_DONE; -} - -/* Opcode: Integer P1 * P3 -** -** The integer value P1 is pushed onto the stack. If P3 is not zero -** then it is assumed to be a string representation of the same integer. -** If P1 is zero and P3 is not zero, then the value is derived from P3. -** -** If the value cannot be represented as a 32-bits then its value -** will be in P3. -*/ -case OP_Integer: { - pTos++; - if( pOp->p3==0 ){ - pTos->flags = MEM_Int; - pTos->i = pOp->p1; - }else{ - pTos->flags = MEM_Str|MEM_Static|MEM_Term; - pTos->z = pOp->p3; - pTos->n = strlen(pTos->z); - pTos->enc = SQLITE_UTF8; - pTos->i = sqlite3VdbeIntValue(pTos); - pTos->flags |= MEM_Int; - } - break; -} - -/* Opcode: Real * * P3 -** -** The string value P3 is converted to a real and pushed on to the stack. -*/ -case OP_Real: { /* same as TK_FLOAT, */ - pTos++; - pTos->flags = MEM_Str|MEM_Static|MEM_Term; - pTos->z = pOp->p3; - pTos->n = strlen(pTos->z); - pTos->enc = SQLITE_UTF8; - pTos->r = sqlite3VdbeRealValue(pTos); - pTos->flags |= MEM_Real; - sqlite3VdbeChangeEncoding(pTos, db->enc); - break; -} - -/* Opcode: String8 * * P3 -** -** P3 points to a nul terminated UTF-8 string. This opcode is transformed -** into an OP_String before it is executed for the first time. -*/ -case OP_String8: { /* same as TK_STRING */ -#ifndef SQLITE_OMIT_UTF16 - pOp->opcode = OP_String; - - assert( pOp->p3!=0 ); - if( db->enc!=SQLITE_UTF8 ){ - pTos++; - sqlite3VdbeMemSetStr(pTos, pOp->p3, -1, SQLITE_UTF8, SQLITE_STATIC); - if( SQLITE_OK!=sqlite3VdbeChangeEncoding(pTos, db->enc) ) goto no_mem; - if( SQLITE_OK!=sqlite3VdbeMemDynamicify(pTos) ) goto no_mem; - pTos->flags &= ~(MEM_Dyn); - pTos->flags |= MEM_Static; - if( pOp->p3type==P3_DYNAMIC ){ - sqliteFree(pOp->p3); - } - pOp->p3type = P3_DYNAMIC; - pOp->p3 = pTos->z; - break; - } -#endif - /* Otherwise fall through to the next case, OP_String */ -} - -/* Opcode: String * * P3 -** -** The string value P3 is pushed onto the stack. If P3==0 then a -** NULL is pushed onto the stack. P3 is assumed to be a nul terminated -** string encoded with the database native encoding. -*/ -case OP_String: { - pTos++; - assert( pOp->p3!=0 ); - pTos->flags = MEM_Str|MEM_Static|MEM_Term; - pTos->z = pOp->p3; -#ifndef SQLITE_OMIT_UTF16 - if( db->enc==SQLITE_UTF8 ){ - pTos->n = strlen(pTos->z); - }else{ - pTos->n = sqlite3utf16ByteLen(pTos->z, -1); - } -#else - assert( db->enc==SQLITE_UTF8 ); - pTos->n = strlen(pTos->z); -#endif - pTos->enc = db->enc; - break; -} - -/* Opcode: Null * * * -** -** Push a NULL onto the stack. -*/ -case OP_Null: { - pTos++; - pTos->flags = MEM_Null; - break; -} - - -#ifndef SQLITE_OMIT_BLOB_LITERAL -/* Opcode: HexBlob * * P3 -** -** P3 is an UTF-8 SQL hex encoding of a blob. The blob is pushed onto the -** vdbe stack. -** -** The first time this instruction executes, in transforms itself into a -** 'Blob' opcode with a binary blob as P3. -*/ -case OP_HexBlob: { /* same as TK_BLOB */ - pOp->opcode = OP_Blob; - pOp->p1 = strlen(pOp->p3)/2; - if( pOp->p1 ){ - char *zBlob = sqlite3HexToBlob(pOp->p3); - if( !zBlob ) goto no_mem; - if( pOp->p3type==P3_DYNAMIC ){ - sqliteFree(pOp->p3); - } - pOp->p3 = zBlob; - pOp->p3type = P3_DYNAMIC; - }else{ - if( pOp->p3type==P3_DYNAMIC ){ - sqliteFree(pOp->p3); - } - pOp->p3type = P3_STATIC; - pOp->p3 = ""; - } - - /* Fall through to the next case, OP_Blob. */ -} - -/* Opcode: Blob P1 * P3 -** -** P3 points to a blob of data P1 bytes long. Push this -** value onto the stack. This instruction is not coded directly -** by the compiler. Instead, the compiler layer specifies -** an OP_HexBlob opcode, with the hex string representation of -** the blob as P3. This opcode is transformed to an OP_Blob -** the first time it is executed. -*/ -case OP_Blob: { - pTos++; - sqlite3VdbeMemSetStr(pTos, pOp->p3, pOp->p1, 0, 0); - break; -} -#endif /* SQLITE_OMIT_BLOB_LITERAL */ - -/* Opcode: Variable P1 * * -** -** Push the value of variable P1 onto the stack. A variable is -** an unknown in the original SQL string as handed to sqlite3_compile(). -** Any occurance of the '?' character in the original SQL is considered -** a variable. Variables in the SQL string are number from left to -** right beginning with 1. The values of variables are set using the -** sqlite3_bind() API. -*/ -case OP_Variable: { - int j = pOp->p1 - 1; - assert( j>=0 && j<p->nVar ); - - pTos++; - sqlite3VdbeMemShallowCopy(pTos, &p->aVar[j], MEM_Static); - break; -} - -/* Opcode: Pop P1 * * -** -** P1 elements are popped off of the top of stack and discarded. -*/ -case OP_Pop: { /* no-push */ - assert( pOp->p1>=0 ); - popStack(&pTos, pOp->p1); - assert( pTos>=&p->aStack[-1] ); - break; -} - -/* Opcode: Dup P1 P2 * -** -** A copy of the P1-th element of the stack -** is made and pushed onto the top of the stack. -** The top of the stack is element 0. So the -** instruction "Dup 0 0 0" will make a copy of the -** top of the stack. -** -** If the content of the P1-th element is a dynamically -** allocated string, then a new copy of that string -** is made if P2==0. If P2!=0, then just a pointer -** to the string is copied. -** -** Also see the Pull instruction. -*/ -case OP_Dup: { - Mem *pFrom = &pTos[-pOp->p1]; - assert( pFrom<=pTos && pFrom>=p->aStack ); - pTos++; - sqlite3VdbeMemShallowCopy(pTos, pFrom, MEM_Ephem); - if( pOp->p2 ){ - Deephemeralize(pTos); - } - break; -} - -/* Opcode: Pull P1 * * -** -** The P1-th element is removed from its current location on -** the stack and pushed back on top of the stack. The -** top of the stack is element 0, so "Pull 0 0 0" is -** a no-op. "Pull 1 0 0" swaps the top two elements of -** the stack. -** -** See also the Dup instruction. -*/ -case OP_Pull: { /* no-push */ - Mem *pFrom = &pTos[-pOp->p1]; - int i; - Mem ts; - - ts = *pFrom; - Deephemeralize(pTos); - for(i=0; i<pOp->p1; i++, pFrom++){ - Deephemeralize(&pFrom[1]); - assert( (pFrom->flags & MEM_Ephem)==0 ); - *pFrom = pFrom[1]; - if( pFrom->flags & MEM_Short ){ - assert( pFrom->flags & (MEM_Str|MEM_Blob) ); - assert( pFrom->z==pFrom[1].zShort ); - pFrom->z = pFrom->zShort; - } - } - *pTos = ts; - if( pTos->flags & MEM_Short ){ - assert( pTos->flags & (MEM_Str|MEM_Blob) ); - assert( pTos->z==pTos[-pOp->p1].zShort ); - pTos->z = pTos->zShort; - } - break; -} - -/* Opcode: Push P1 * * -** -** Overwrite the value of the P1-th element down on the -** stack (P1==0 is the top of the stack) with the value -** of the top of the stack. Then pop the top of the stack. -*/ -case OP_Push: { /* no-push */ - Mem *pTo = &pTos[-pOp->p1]; - - assert( pTo>=p->aStack ); - sqlite3VdbeMemMove(pTo, pTos); - pTos--; - break; -} - -/* Opcode: Callback P1 * * -** -** Pop P1 values off the stack and form them into an array. Then -** invoke the callback function using the newly formed array as the -** 3rd parameter. -*/ -case OP_Callback: { /* no-push */ - int i; - assert( p->nResColumn==pOp->p1 ); - - for(i=0; i<pOp->p1; i++){ - Mem *pVal = &pTos[0-i]; - sqlite3VdbeMemNulTerminate(pVal); - storeTypeInfo(pVal, db->enc); - } - - p->resOnStack = 1; - p->nCallback++; - p->popStack = pOp->p1; - p->pc = pc + 1; - p->pTos = pTos; - return SQLITE_ROW; -} - -/* Opcode: Concat P1 P2 * -** -** Look at the first P1+2 elements of the stack. Append them all -** together with the lowest element first. The original P1+2 elements -** are popped from the stack if P2==0 and retained if P2==1. If -** any element of the stack is NULL, then the result is NULL. -** -** When P1==1, this routine makes a copy of the top stack element -** into memory obtained from sqliteMalloc(). -*/ -case OP_Concat: { /* same as TK_CONCAT */ - char *zNew; - int nByte; - int nField; - int i, j; - Mem *pTerm; - - /* Loop through the stack elements to see how long the result will be. */ - nField = pOp->p1 + 2; - pTerm = &pTos[1-nField]; - nByte = 0; - for(i=0; i<nField; i++, pTerm++){ - assert( pOp->p2==0 || (pTerm->flags&MEM_Str) ); - if( pTerm->flags&MEM_Null ){ - nByte = -1; - break; - } - Stringify(pTerm, db->enc); - nByte += pTerm->n; - } - - if( nByte<0 ){ - /* If nByte is less than zero, then there is a NULL value on the stack. - ** In this case just pop the values off the stack (if required) and - ** push on a NULL. - */ - if( pOp->p2==0 ){ - popStack(&pTos, nField); - } - pTos++; - pTos->flags = MEM_Null; - }else{ - /* Otherwise malloc() space for the result and concatenate all the - ** stack values. - */ - zNew = sqliteMallocRaw( nByte+2 ); - if( zNew==0 ) goto no_mem; - j = 0; - pTerm = &pTos[1-nField]; - for(i=j=0; i<nField; i++, pTerm++){ - int n = pTerm->n; - assert( pTerm->flags & MEM_Str ); - memcpy(&zNew[j], pTerm->z, n); - j += n; - } - zNew[j] = 0; - zNew[j+1] = 0; - assert( j==nByte ); - - if( pOp->p2==0 ){ - popStack(&pTos, nField); - } - pTos++; - pTos->n = j; - pTos->flags = MEM_Str|MEM_Dyn|MEM_Term; - pTos->xDel = 0; - pTos->enc = db->enc; - pTos->z = zNew; - } - break; -} - -/* Opcode: Add * * * -** -** Pop the top two elements from the stack, add them together, -** and push the result back onto the stack. If either element -** is a string then it is converted to a double using the atof() -** function before the addition. -** If either operand is NULL, the result is NULL. -*/ -/* Opcode: Multiply * * * -** -** Pop the top two elements from the stack, multiply them together, -** and push the result back onto the stack. If either element -** is a string then it is converted to a double using the atof() -** function before the multiplication. -** If either operand is NULL, the result is NULL. -*/ -/* Opcode: Subtract * * * -** -** Pop the top two elements from the stack, subtract the -** first (what was on top of the stack) from the second (the -** next on stack) -** and push the result back onto the stack. If either element -** is a string then it is converted to a double using the atof() -** function before the subtraction. -** If either operand is NULL, the result is NULL. -*/ -/* Opcode: Divide * * * -** -** Pop the top two elements from the stack, divide the -** first (what was on top of the stack) from the second (the -** next on stack) -** and push the result back onto the stack. If either element -** is a string then it is converted to a double using the atof() -** function before the division. Division by zero returns NULL. -** If either operand is NULL, the result is NULL. -*/ -/* Opcode: Remainder * * * -** -** Pop the top two elements from the stack, divide the -** first (what was on top of the stack) from the second (the -** next on stack) -** and push the remainder after division onto the stack. If either element -** is a string then it is converted to a double using the atof() -** function before the division. Division by zero returns NULL. -** If either operand is NULL, the result is NULL. -*/ -case OP_Add: /* same as TK_PLUS, no-push */ -case OP_Subtract: /* same as TK_MINUS, no-push */ -case OP_Multiply: /* same as TK_STAR, no-push */ -case OP_Divide: /* same as TK_SLASH, no-push */ -case OP_Remainder: { /* same as TK_REM, no-push */ - Mem *pNos = &pTos[-1]; - assert( pNos>=p->aStack ); - if( ((pTos->flags | pNos->flags) & MEM_Null)!=0 ){ - Release(pTos); - pTos--; - Release(pTos); - pTos->flags = MEM_Null; - }else if( (pTos->flags & pNos->flags & MEM_Int)==MEM_Int ){ - i64 a, b; - a = pTos->i; - b = pNos->i; - switch( pOp->opcode ){ - case OP_Add: b += a; break; - case OP_Subtract: b -= a; break; - case OP_Multiply: b *= a; break; - case OP_Divide: { - if( a==0 ) goto divide_by_zero; - b /= a; - break; - } - default: { - if( a==0 ) goto divide_by_zero; - b %= a; - break; - } - } - Release(pTos); - pTos--; - Release(pTos); - pTos->i = b; - pTos->flags = MEM_Int; - }else{ - double a, b; - a = sqlite3VdbeRealValue(pTos); - b = sqlite3VdbeRealValue(pNos); - switch( pOp->opcode ){ - case OP_Add: b += a; break; - case OP_Subtract: b -= a; break; - case OP_Multiply: b *= a; break; - case OP_Divide: { - if( a==0.0 ) goto divide_by_zero; - b /= a; - break; - } - default: { - int ia = (int)a; - int ib = (int)b; - if( ia==0.0 ) goto divide_by_zero; - b = ib % ia; - break; - } - } - Release(pTos); - pTos--; - Release(pTos); - pTos->r = b; - pTos->flags = MEM_Real; - } - break; - -divide_by_zero: - Release(pTos); - pTos--; - Release(pTos); - pTos->flags = MEM_Null; - break; -} - -/* Opcode: CollSeq * * P3 -** -** P3 is a pointer to a CollSeq struct. If the next call to a user function -** or aggregate calls sqlite3GetFuncCollSeq(), this collation sequence will -** be returned. This is used by the built-in min(), max() and nullif() -** functions. -** -** The interface used by the implementation of the aforementioned functions -** to retrieve the collation sequence set by this opcode is not available -** publicly, only to user functions defined in func.c. -*/ -case OP_CollSeq: { /* no-push */ - assert( pOp->p3type==P3_COLLSEQ ); - break; -} - -/* Opcode: Function P1 P2 P3 -** -** Invoke a user function (P3 is a pointer to a Function structure that -** defines the function) with P1 arguments taken from the stack. Pop all -** arguments from the stack and push back the result. -** -** P2 is a 32-bit bitmask indicating whether or not each argument to the -** function was determined to be constant at compile time. If the first -** argument was constant then bit 0 of P2 is set. This is used to determine -** whether meta data associated with a user function argument using the -** sqlite3_set_auxdata() API may be safely retained until the next -** invocation of this opcode. -** -** See also: AggFunc -*/ -case OP_Function: { - int i; - Mem *pArg; - sqlite3_context ctx; - sqlite3_value **apVal; - int n = pOp->p1; - - n = pOp->p1; - apVal = p->apArg; - assert( apVal || n==0 ); - - pArg = &pTos[1-n]; - for(i=0; i<n; i++, pArg++){ - apVal[i] = pArg; - storeTypeInfo(pArg, db->enc); - } - - assert( pOp->p3type==P3_FUNCDEF || pOp->p3type==P3_VDBEFUNC ); - if( pOp->p3type==P3_FUNCDEF ){ - ctx.pFunc = (FuncDef*)pOp->p3; - ctx.pVdbeFunc = 0; - }else{ - ctx.pVdbeFunc = (VdbeFunc*)pOp->p3; - ctx.pFunc = ctx.pVdbeFunc->pFunc; - } - - ctx.s.flags = MEM_Null; - ctx.s.z = 0; - ctx.s.xDel = 0; - ctx.isError = 0; - if( ctx.pFunc->needCollSeq ){ - assert( pOp>p->aOp ); - assert( pOp[-1].p3type==P3_COLLSEQ ); - assert( pOp[-1].opcode==OP_CollSeq ); - ctx.pColl = (CollSeq *)pOp[-1].p3; - } - if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; - (*ctx.pFunc->xFunc)(&ctx, n, apVal); - if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; - if( sqlite3_malloc_failed ) goto no_mem; - popStack(&pTos, n); - - /* If any auxilary data functions have been called by this user function, - ** immediately call the destructor for any non-static values. - */ - if( ctx.pVdbeFunc ){ - sqlite3VdbeDeleteAuxData(ctx.pVdbeFunc, pOp->p2); - pOp->p3 = (char *)ctx.pVdbeFunc; - pOp->p3type = P3_VDBEFUNC; - } - - /* Copy the result of the function to the top of the stack */ - sqlite3VdbeChangeEncoding(&ctx.s, db->enc); - pTos++; - pTos->flags = 0; - sqlite3VdbeMemMove(pTos, &ctx.s); - - /* If the function returned an error, throw an exception */ - if( ctx.isError ){ - if( !(pTos->flags&MEM_Str) ){ - sqlite3SetString(&p->zErrMsg, "user function error", (char*)0); - }else{ - sqlite3SetString(&p->zErrMsg, sqlite3_value_text(pTos), (char*)0); - sqlite3VdbeChangeEncoding(pTos, db->enc); - } - rc = SQLITE_ERROR; - } - break; -} - -/* Opcode: BitAnd * * * -** -** Pop the top two elements from the stack. Convert both elements -** to integers. Push back onto the stack the bit-wise AND of the -** two elements. -** If either operand is NULL, the result is NULL. -*/ -/* Opcode: BitOr * * * -** -** Pop the top two elements from the stack. Convert both elements -** to integers. Push back onto the stack the bit-wise OR of the -** two elements. -** If either operand is NULL, the result is NULL. -*/ -/* Opcode: ShiftLeft * * * -** -** Pop the top two elements from the stack. Convert both elements -** to integers. Push back onto the stack the second element shifted -** left by N bits where N is the top element on the stack. -** If either operand is NULL, the result is NULL. -*/ -/* Opcode: ShiftRight * * * -** -** Pop the top two elements from the stack. Convert both elements -** to integers. Push back onto the stack the second element shifted -** right by N bits where N is the top element on the stack. -** If either operand is NULL, the result is NULL. -*/ -case OP_BitAnd: /* same as TK_BITAND, no-push */ -case OP_BitOr: /* same as TK_BITOR, no-push */ -case OP_ShiftLeft: /* same as TK_LSHIFT, no-push */ -case OP_ShiftRight: { /* same as TK_RSHIFT, no-push */ - Mem *pNos = &pTos[-1]; - int a, b; - - assert( pNos>=p->aStack ); - if( (pTos->flags | pNos->flags) & MEM_Null ){ - popStack(&pTos, 2); - pTos++; - pTos->flags = MEM_Null; - break; - } - a = sqlite3VdbeIntValue(pNos); - b = sqlite3VdbeIntValue(pTos); - switch( pOp->opcode ){ - case OP_BitAnd: a &= b; break; - case OP_BitOr: a |= b; break; - case OP_ShiftLeft: a <<= b; break; - case OP_ShiftRight: a >>= b; break; - default: /* CANT HAPPEN */ break; - } - Release(pTos); - pTos--; - Release(pTos); - pTos->i = a; - pTos->flags = MEM_Int; - break; -} - -/* Opcode: AddImm P1 * * -** -** Add the value P1 to whatever is on top of the stack. The result -** is always an integer. -** -** To force the top of the stack to be an integer, just add 0. -*/ -case OP_AddImm: { /* no-push */ - assert( pTos>=p->aStack ); - Integerify(pTos); - pTos->i += pOp->p1; - break; -} - -/* Opcode: ForceInt P1 P2 * -** -** Convert the top of the stack into an integer. If the current top of -** the stack is not numeric (meaning that is is a NULL or a string that -** does not look like an integer or floating point number) then pop the -** stack and jump to P2. If the top of the stack is numeric then -** convert it into the least integer that is greater than or equal to its -** current value if P1==0, or to the least integer that is strictly -** greater than its current value if P1==1. -*/ -case OP_ForceInt: { /* no-push */ - i64 v; - assert( pTos>=p->aStack ); - applyAffinity(pTos, SQLITE_AFF_INTEGER, db->enc); - if( (pTos->flags & (MEM_Int|MEM_Real))==0 ){ - Release(pTos); - pTos--; - pc = pOp->p2 - 1; - break; - } - if( pTos->flags & MEM_Int ){ - v = pTos->i + (pOp->p1!=0); - }else{ - Realify(pTos); - v = (int)pTos->r; - if( pTos->r>(double)v ) v++; - if( pOp->p1 && pTos->r==(double)v ) v++; - } - Release(pTos); - pTos->i = v; - pTos->flags = MEM_Int; - break; -} - -/* Opcode: MustBeInt P1 P2 * -** -** Force the top of the stack to be an integer. If the top of the -** stack is not an integer and cannot be converted into an integer -** with out data loss, then jump immediately to P2, or if P2==0 -** raise an SQLITE_MISMATCH exception. -** -** If the top of the stack is not an integer and P2 is not zero and -** P1 is 1, then the stack is popped. In all other cases, the depth -** of the stack is unchanged. -*/ -case OP_MustBeInt: { /* no-push */ - assert( pTos>=p->aStack ); - applyAffinity(pTos, SQLITE_AFF_INTEGER, db->enc); - if( (pTos->flags & MEM_Int)==0 ){ - if( pOp->p2==0 ){ - rc = SQLITE_MISMATCH; - goto abort_due_to_error; - }else{ - if( pOp->p1 ) popStack(&pTos, 1); - pc = pOp->p2 - 1; - } - }else{ - Release(pTos); - pTos->flags = MEM_Int; - } - break; -} - -/* Opcode: Eq P1 P2 P3 -** -** Pop the top two elements from the stack. If they are equal, then -** jump to instruction P2. Otherwise, continue to the next instruction. -** -** If the 0x100 bit of P1 is true and either operand is NULL then take the -** jump. If the 0x100 bit of P1 is false then fall thru if either operand -** is NULL. -** -** The least significant byte of P1 (mask 0xff) must be an affinity character - -** 'n', 't', 'i' or 'o' - or 0x00. An attempt is made to coerce both values -** according to the affinity before the comparison is made. If the byte is -** 0x00, then numeric affinity is used. -** -** Once any conversions have taken place, and neither value is NULL, -** the values are compared. If both values are blobs, or both are text, -** then memcmp() is used to determine the results of the comparison. If -** both values are numeric, then a numeric comparison is used. If the -** two values are of different types, then they are inequal. -** -** If P2 is zero, do not jump. Instead, push an integer 1 onto the -** stack if the jump would have been taken, or a 0 if not. Push a -** NULL if either operand was NULL. -** -** If P3 is not NULL it is a pointer to a collating sequence (a CollSeq -** structure) that defines how to compare text. -*/ -/* Opcode: Ne P1 P2 P3 -** -** This works just like the Eq opcode except that the jump is taken if -** the operands from the stack are not equal. See the Eq opcode for -** additional information. -*/ -/* Opcode: Lt P1 P2 P3 -** -** This works just like the Eq opcode except that the jump is taken if -** the 2nd element down on the stack is less than the top of the stack. -** See the Eq opcode for additional information. -*/ -/* Opcode: Le P1 P2 P3 -** -** This works just like the Eq opcode except that the jump is taken if -** the 2nd element down on the stack is less than or equal to the -** top of the stack. See the Eq opcode for additional information. -*/ -/* Opcode: Gt P1 P2 P3 -** -** This works just like the Eq opcode except that the jump is taken if -** the 2nd element down on the stack is greater than the top of the stack. -** See the Eq opcode for additional information. -*/ -/* Opcode: Ge P1 P2 P3 -** -** This works just like the Eq opcode except that the jump is taken if -** the 2nd element down on the stack is greater than or equal to the -** top of the stack. See the Eq opcode for additional information. -*/ -case OP_Eq: /* same as TK_EQ, no-push */ -case OP_Ne: /* same as TK_NE, no-push */ -case OP_Lt: /* same as TK_LT, no-push */ -case OP_Le: /* same as TK_LE, no-push */ -case OP_Gt: /* same as TK_GT, no-push */ -case OP_Ge: { /* same as TK_GE, no-push */ - Mem *pNos; - int flags; - int res; - char affinity; - - pNos = &pTos[-1]; - flags = pTos->flags|pNos->flags; - - /* If either value is a NULL P2 is not zero, take the jump if the least - ** significant byte of P1 is true. If P2 is zero, then push a NULL onto - ** the stack. - */ - if( flags&MEM_Null ){ - popStack(&pTos, 2); - if( pOp->p2 ){ - if( pOp->p1 & 0x100 ) pc = pOp->p2-1; - }else{ - pTos++; - pTos->flags = MEM_Null; - } - break; - } - - affinity = pOp->p1 & 0xFF; - if( affinity ){ - applyAffinity(pNos, affinity, db->enc); - applyAffinity(pTos, affinity, db->enc); - } - - assert( pOp->p3type==P3_COLLSEQ || pOp->p3==0 ); - res = sqlite3MemCompare(pNos, pTos, (CollSeq*)pOp->p3); - switch( pOp->opcode ){ - case OP_Eq: res = res==0; break; - case OP_Ne: res = res!=0; break; - case OP_Lt: res = res<0; break; - case OP_Le: res = res<=0; break; - case OP_Gt: res = res>0; break; - default: res = res>=0; break; - } - - popStack(&pTos, 2); - if( pOp->p2 ){ - if( res ){ - pc = pOp->p2-1; - } - }else{ - pTos++; - pTos->flags = MEM_Int; - pTos->i = res; - } - break; -} - -/* Opcode: And * * * -** -** Pop two values off the stack. Take the logical AND of the -** two values and push the resulting boolean value back onto the -** stack. -*/ -/* Opcode: Or * * * -** -** Pop two values off the stack. Take the logical OR of the -** two values and push the resulting boolean value back onto the -** stack. -*/ -case OP_And: /* same as TK_AND, no-push */ -case OP_Or: { /* same as TK_OR, no-push */ - Mem *pNos = &pTos[-1]; - int v1, v2; /* 0==TRUE, 1==FALSE, 2==UNKNOWN or NULL */ - - assert( pNos>=p->aStack ); - if( pTos->flags & MEM_Null ){ - v1 = 2; - }else{ - Integerify(pTos); - v1 = pTos->i==0; - } - if( pNos->flags & MEM_Null ){ - v2 = 2; - }else{ - Integerify(pNos); - v2 = pNos->i==0; - } - if( pOp->opcode==OP_And ){ - static const unsigned char and_logic[] = { 0, 1, 2, 1, 1, 1, 2, 1, 2 }; - v1 = and_logic[v1*3+v2]; - }else{ - static const unsigned char or_logic[] = { 0, 0, 0, 0, 1, 2, 0, 2, 2 }; - v1 = or_logic[v1*3+v2]; - } - popStack(&pTos, 2); - pTos++; - if( v1==2 ){ - pTos->flags = MEM_Null; - }else{ - pTos->i = v1==0; - pTos->flags = MEM_Int; - } - break; -} - -/* Opcode: Negative * * * -** -** Treat the top of the stack as a numeric quantity. Replace it -** with its additive inverse. If the top of the stack is NULL -** its value is unchanged. -*/ -/* Opcode: AbsValue * * * -** -** Treat the top of the stack as a numeric quantity. Replace it -** with its absolute value. If the top of the stack is NULL -** its value is unchanged. -*/ -case OP_Negative: /* same as TK_UMINUS, no-push */ -case OP_AbsValue: { - assert( pTos>=p->aStack ); - if( pTos->flags & MEM_Real ){ - Release(pTos); - if( pOp->opcode==OP_Negative || pTos->r<0.0 ){ - pTos->r = -pTos->r; - } - pTos->flags = MEM_Real; - }else if( pTos->flags & MEM_Int ){ - Release(pTos); - if( pOp->opcode==OP_Negative || pTos->i<0 ){ - pTos->i = -pTos->i; - } - pTos->flags = MEM_Int; - }else if( pTos->flags & MEM_Null ){ - /* Do nothing */ - }else{ - Realify(pTos); - if( pOp->opcode==OP_Negative || pTos->r<0.0 ){ - pTos->r = -pTos->r; - } - pTos->flags = MEM_Real; - } - break; -} - -/* Opcode: Not * * * -** -** Interpret the top of the stack as a boolean value. Replace it -** with its complement. If the top of the stack is NULL its value -** is unchanged. -*/ -case OP_Not: { /* same as TK_NOT, no-push */ - assert( pTos>=p->aStack ); - if( pTos->flags & MEM_Null ) break; /* Do nothing to NULLs */ - Integerify(pTos); - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos->i = !pTos->i; - pTos->flags = MEM_Int; - break; -} - -/* Opcode: BitNot * * * -** -** Interpret the top of the stack as an value. Replace it -** with its ones-complement. If the top of the stack is NULL its -** value is unchanged. -*/ -case OP_BitNot: { /* same as TK_BITNOT, no-push */ - assert( pTos>=p->aStack ); - if( pTos->flags & MEM_Null ) break; /* Do nothing to NULLs */ - Integerify(pTos); - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos->i = ~pTos->i; - pTos->flags = MEM_Int; - break; -} - -/* Opcode: Noop * * * -** -** Do nothing. This instruction is often useful as a jump -** destination. -*/ -case OP_Noop: { /* no-push */ - break; -} - -/* Opcode: If P1 P2 * -** -** Pop a single boolean from the stack. If the boolean popped is -** true, then jump to p2. Otherwise continue to the next instruction. -** An integer is false if zero and true otherwise. A string is -** false if it has zero length and true otherwise. -** -** If the value popped of the stack is NULL, then take the jump if P1 -** is true and fall through if P1 is false. -*/ -/* Opcode: IfNot P1 P2 * -** -** Pop a single boolean from the stack. If the boolean popped is -** false, then jump to p2. Otherwise continue to the next instruction. -** An integer is false if zero and true otherwise. A string is -** false if it has zero length and true otherwise. -** -** If the value popped of the stack is NULL, then take the jump if P1 -** is true and fall through if P1 is false. -*/ -case OP_If: /* no-push */ -case OP_IfNot: { /* no-push */ - int c; - assert( pTos>=p->aStack ); - if( pTos->flags & MEM_Null ){ - c = pOp->p1; - }else{ -#ifdef SQLITE_OMIT_FLOATING_POINT - c = sqlite3VdbeIntValue(pTos); -#else - c = sqlite3VdbeRealValue(pTos)!=0.0; -#endif - if( pOp->opcode==OP_IfNot ) c = !c; - } - Release(pTos); - pTos--; - if( c ) pc = pOp->p2-1; - break; -} - -/* Opcode: IsNull P1 P2 * -** -** If any of the top abs(P1) values on the stack are NULL, then jump -** to P2. Pop the stack P1 times if P1>0. If P1<0 leave the stack -** unchanged. -*/ -case OP_IsNull: { /* same as TK_ISNULL, no-push */ - int i, cnt; - Mem *pTerm; - cnt = pOp->p1; - if( cnt<0 ) cnt = -cnt; - pTerm = &pTos[1-cnt]; - assert( pTerm>=p->aStack ); - for(i=0; i<cnt; i++, pTerm++){ - if( pTerm->flags & MEM_Null ){ - pc = pOp->p2-1; - break; - } - } - if( pOp->p1>0 ) popStack(&pTos, cnt); - break; -} - -/* Opcode: NotNull P1 P2 * -** -** Jump to P2 if the top P1 values on the stack are all not NULL. Pop the -** stack if P1 times if P1 is greater than zero. If P1 is less than -** zero then leave the stack unchanged. -*/ -case OP_NotNull: { /* same as TK_NOTNULL, no-push */ - int i, cnt; - cnt = pOp->p1; - if( cnt<0 ) cnt = -cnt; - assert( &pTos[1-cnt] >= p->aStack ); - for(i=0; i<cnt && (pTos[1+i-cnt].flags & MEM_Null)==0; i++){} - if( i>=cnt ) pc = pOp->p2-1; - if( pOp->p1>0 ) popStack(&pTos, cnt); - break; -} - -/* Opcode: SetNumColumns P1 P2 * -** -** Before the OP_Column opcode can be executed on a cursor, this -** opcode must be called to set the number of fields in the table. -** -** This opcode sets the number of columns for cursor P1 to P2. -** -** If OP_KeyAsData is to be applied to cursor P1, it must be executed -** before this op-code. -*/ -case OP_SetNumColumns: { /* no-push */ - Cursor *pC; - assert( (pOp->p1)<p->nCursor ); - assert( p->apCsr[pOp->p1]!=0 ); - pC = p->apCsr[pOp->p1]; - pC->nField = pOp->p2; - break; -} - -/* Opcode: Column P1 P2 P3 -** -** Interpret the data that cursor P1 points to as a structure built using -** the MakeRecord instruction. (See the MakeRecord opcode for additional -** information about the format of the data.) Push onto the stack the value -** of the P2-th column contained in the data. If there are less that (P2+1) -** values in the record, push a NULL onto the stack. -** -** If the KeyAsData opcode has previously executed on this cursor, then the -** field might be extracted from the key rather than the data. -** -** If P1 is negative, then the record is stored on the stack rather than in -** a table. For P1==-1, the top of the stack is used. For P1==-2, the -** next on the stack is used. And so forth. The value pushed is always -** just a pointer into the record which is stored further down on the -** stack. The column value is not copied. The number of columns in the -** record is stored on the stack just above the record itself. -*/ -case OP_Column: { - u32 payloadSize; /* Number of bytes in the record */ - int p1 = pOp->p1; /* P1 value of the opcode */ - int p2 = pOp->p2; /* column number to retrieve */ - Cursor *pC = 0; /* The VDBE cursor */ - char *zRec; /* Pointer to complete record-data */ - BtCursor *pCrsr; /* The BTree cursor */ - u32 *aType; /* aType[i] holds the numeric type of the i-th column */ - u32 *aOffset; /* aOffset[i] is offset to start of data for i-th column */ - u32 nField; /* number of fields in the record */ - u32 szHdr; /* Number of bytes in the record header */ - int len; /* The length of the serialized data for the column */ - int offset = 0; /* Offset into the data */ - int idx; /* Index into the header */ - int i; /* Loop counter */ - char *zData; /* Part of the record being decoded */ - Mem sMem; /* For storing the record being decoded */ - - sMem.flags = 0; - assert( p1<p->nCursor ); - pTos++; - pTos->flags = MEM_Null; - - /* This block sets the variable payloadSize to be the total number of - ** bytes in the record. - ** - ** zRec is set to be the complete text of the record if it is available. - ** The complete record text is always available for pseudo-tables and - ** when we are decoded a record from the stack. If the record is stored - ** in a cursor, the complete record text might be available in the - ** pC->aRow cache. Or it might not be. If the data is unavailable, - ** zRec is set to NULL. - ** - ** We also compute the number of columns in the record. For cursors, - ** the number of columns is stored in the Cursor.nField element. For - ** records on the stack, the next entry down on the stack is an integer - ** which is the number of records. - */ - assert( p1<0 || p->apCsr[p1]!=0 ); - if( p1<0 ){ - /* Take the record off of the stack */ - Mem *pRec = &pTos[p1]; - Mem *pCnt = &pRec[-1]; - assert( pRec>=p->aStack ); - assert( pRec->flags & MEM_Blob ); - payloadSize = pRec->n; - zRec = pRec->z; - assert( pCnt>=p->aStack ); - assert( pCnt->flags & MEM_Int ); - nField = pCnt->i; - pCrsr = 0; - }else if( (pC = p->apCsr[p1])->pCursor!=0 ){ - /* The record is stored in a B-Tree */ - rc = sqlite3VdbeCursorMoveto(pC); - if( rc ) goto abort_due_to_error; - zRec = 0; - pCrsr = pC->pCursor; - if( pC->nullRow ){ - payloadSize = 0; - }else if( pC->cacheValid ){ - payloadSize = pC->payloadSize; - zRec = pC->aRow; - }else if( pC->isIndex ){ - i64 payloadSize64; - sqlite3BtreeKeySize(pCrsr, &payloadSize64); - payloadSize = payloadSize64; - }else{ - sqlite3BtreeDataSize(pCrsr, &payloadSize); - } - nField = pC->nField; -#ifndef SQLITE_OMIT_TRIGGER - }else if( pC->pseudoTable ){ - /* The record is the sole entry of a pseudo-table */ - payloadSize = pC->nData; - zRec = pC->pData; - pC->cacheValid = 0; - assert( payloadSize==0 || zRec!=0 ); - nField = pC->nField; - pCrsr = 0; -#endif - }else{ - zRec = 0; - payloadSize = 0; - pCrsr = 0; - nField = 0; - } - - /* If payloadSize is 0, then just push a NULL onto the stack. */ - if( payloadSize==0 ){ - pTos->flags = MEM_Null; - break; - } - - assert( p2<nField ); - - /* Read and parse the table header. Store the results of the parse - ** into the record header cache fields of the cursor. - */ - if( pC && pC->cacheValid ){ - aType = pC->aType; - aOffset = pC->aOffset; - }else{ - int avail; /* Number of bytes of available data */ - if( pC && pC->aType ){ - aType = pC->aType; - }else{ - aType = sqliteMallocRaw( 2*nField*sizeof(aType) ); - } - aOffset = &aType[nField]; - if( aType==0 ){ - goto no_mem; - } - - /* Figure out how many bytes are in the header */ - if( zRec ){ - zData = zRec; - }else{ - if( pC->isIndex ){ - zData = (char*)sqlite3BtreeKeyFetch(pCrsr, &avail); - }else{ - zData = (char*)sqlite3BtreeDataFetch(pCrsr, &avail); - } - /* If KeyFetch()/DataFetch() managed to get the entire payload, - ** save the payload in the pC->aRow cache. That will save us from - ** having to make additional calls to fetch the content portion of - ** the record. - */ - if( avail>=payloadSize ){ - zRec = pC->aRow = zData; - }else{ - pC->aRow = 0; - } - } - idx = sqlite3GetVarint32(zData, &szHdr); - - - /* The KeyFetch() or DataFetch() above are fast and will get the entire - ** record header in most cases. But they will fail to get the complete - ** record header if the record header does not fit on a single page - ** in the B-Tree. When that happens, use sqlite3VdbeMemFromBtree() to - ** acquire the complete header text. - */ - if( !zRec && avail<szHdr ){ - rc = sqlite3VdbeMemFromBtree(pCrsr, 0, szHdr, pC->isIndex, &sMem); - if( rc!=SQLITE_OK ){ - goto op_column_out; - } - zData = sMem.z; - } - - /* Scan the header and use it to fill in the aType[] and aOffset[] - ** arrays. aType[i] will contain the type integer for the i-th - ** column and aOffset[i] will contain the offset from the beginning - ** of the record to the start of the data for the i-th column - */ - offset = szHdr; - assert( offset>0 ); - i = 0; - while( idx<szHdr && i<nField && offset<=payloadSize ){ - aOffset[i] = offset; - idx += sqlite3GetVarint32(&zData[idx], &aType[i]); - offset += sqlite3VdbeSerialTypeLen(aType[i]); - i++; - } - Release(&sMem); - sMem.flags = MEM_Null; - - /* If i is less that nField, then there are less fields in this - ** record than SetNumColumns indicated there are columns in the - ** table. Set the offset for any extra columns not present in - ** the record to 0. This tells code below to push a NULL onto the - ** stack instead of deserializing a value from the record. - */ - while( i<nField ){ - aOffset[i++] = 0; - } - - /* The header should end at the start of data and the data should - ** end at last byte of the record. If this is not the case then - ** we are dealing with a malformed record. - */ - if( idx!=szHdr || offset!=payloadSize ){ - rc = SQLITE_CORRUPT; - goto op_column_out; - } - - /* Remember all aType and aColumn information if we have a cursor - ** to remember it in. */ - if( pC ){ - pC->payloadSize = payloadSize; - pC->aType = aType; - pC->aOffset = aOffset; - pC->cacheValid = 1; - } - } - - /* Get the column information. If aOffset[p2] is non-zero, then - ** deserialize the value from the record. If aOffset[p2] is zero, - ** then there are not enough fields in the record to satisfy the - ** request. The value is NULL in this case. - */ - if( aOffset[p2] ){ - assert( rc==SQLITE_OK ); - if( zRec ){ - zData = &zRec[aOffset[p2]]; - }else{ - len = sqlite3VdbeSerialTypeLen(aType[p2]); - rc = sqlite3VdbeMemFromBtree(pCrsr, aOffset[p2], len, pC->isIndex,&sMem); - if( rc!=SQLITE_OK ){ - goto op_column_out; - } - zData = sMem.z; - } - sqlite3VdbeSerialGet(zData, aType[p2], pTos); - pTos->enc = db->enc; - }else{ - if( pOp->p3 ){ - sqlite3VdbeMemShallowCopy(pTos, (Mem *)(pOp->p3), MEM_Static); - }else{ - pTos->flags = MEM_Null; - } - } - - /* If we dynamically allocated space to hold the data (in the - ** sqlite3VdbeMemFromBtree() call above) then transfer control of that - ** dynamically allocated space over to the pTos structure rather. - ** This prevents a memory copy. - */ - if( (sMem.flags & MEM_Dyn)!=0 ){ - assert( pTos->flags & MEM_Ephem ); - assert( pTos->flags & (MEM_Str|MEM_Blob) ); - assert( pTos->z==sMem.z ); - assert( sMem.flags & MEM_Term ); - pTos->flags &= ~MEM_Ephem; - pTos->flags |= MEM_Dyn|MEM_Term; - } - - /* pTos->z might be pointing to sMem.zShort[]. Fix that so that we - ** can abandon sMem */ - rc = sqlite3VdbeMemMakeWriteable(pTos); - -op_column_out: - /* Release the aType[] memory if we are not dealing with cursor */ - if( !pC || !pC->aType ){ - sqliteFree(aType); - } - break; -} - -/* Opcode: MakeRecord P1 P2 P3 -** -** Convert the top abs(P1) entries of the stack into a single entry -** suitable for use as a data record in a database table or as a key -** in an index. The details of the format are irrelavant as long as -** the OP_Column opcode can decode the record later and as long as the -** sqlite3VdbeRecordCompare function will correctly compare two encoded -** records. Refer to source code comments for the details of the record -** format. -** -** The original stack entries are popped from the stack if P1>0 but -** remain on the stack if P1<0. -** -** The P2 argument is divided into two 16-bit words before it is processed. -** If the hi-word is non-zero, then an extra integer is read from the stack -** and appended to the record as a varint. If the low-word of P2 is not -** zero and one or more of the entries are NULL, then jump to the value of -** the low-word of P2. This feature can be used to skip a uniqueness test -** on indices. -** -** P3 may be a string that is P1 characters long. The nth character of the -** string indicates the column affinity that should be used for the nth -** field of the index key (i.e. the first character of P3 corresponds to the -** lowest element on the stack). -** -** The mapping from character to affinity is as follows: -** 'n' = NUMERIC. -** 'i' = INTEGER. -** 't' = TEXT. -** 'o' = NONE. -** -** If P3 is NULL then all index fields have the affinity NONE. -*/ -case OP_MakeRecord: { - /* Assuming the record contains N fields, the record format looks - ** like this: - ** - ** ------------------------------------------------------------------------ - ** | hdr-size | type 0 | type 1 | ... | type N-1 | data0 | ... | data N-1 | - ** ------------------------------------------------------------------------ - ** - ** Data(0) is taken from the lowest element of the stack and data(N-1) is - ** the top of the stack. - ** - ** Each type field is a varint representing the serial type of the - ** corresponding data element (see sqlite3VdbeSerialType()). The - ** hdr-size field is also a varint which is the offset from the beginning - ** of the record to data0. - */ - unsigned char *zNewRecord; - unsigned char *zCsr; - Mem *pRec; - Mem *pRowid = 0; - int nData = 0; /* Number of bytes of data space */ - int nHdr = 0; /* Number of bytes of header space */ - int nByte = 0; /* Space required for this record */ - int nVarint; /* Number of bytes in a varint */ - u32 serial_type; /* Type field */ - int containsNull = 0; /* True if any of the data fields are NULL */ - char zTemp[NBFS]; /* Space to hold small records */ - Mem *pData0; - - int leaveOnStack; /* If true, leave the entries on the stack */ - int nField; /* Number of fields in the record */ - int jumpIfNull; /* Jump here if non-zero and any entries are NULL. */ - int addRowid; /* True to append a rowid column at the end */ - char *zAffinity; /* The affinity string for the record */ - - leaveOnStack = ((pOp->p1<0)?1:0); - nField = pOp->p1 * (leaveOnStack?-1:1); - jumpIfNull = (pOp->p2 & 0x00FFFFFF); - addRowid = ((pOp->p2>>24) & 0x0000FFFF)?1:0; - zAffinity = pOp->p3; - - pData0 = &pTos[1-nField]; - assert( pData0>=p->aStack ); - containsNull = 0; - - /* Loop through the elements that will make up the record to figure - ** out how much space is required for the new record. - */ - for(pRec=pData0; pRec<=pTos; pRec++){ - if( zAffinity ){ - applyAffinity(pRec, zAffinity[pRec-pData0], db->enc); - } - if( pRec->flags&MEM_Null ){ - containsNull = 1; - } - serial_type = sqlite3VdbeSerialType(pRec); - nData += sqlite3VdbeSerialTypeLen(serial_type); - nHdr += sqlite3VarintLen(serial_type); - } - - /* If we have to append a varint rowid to this record, set 'rowid' - ** to the value of the rowid and increase nByte by the amount of space - ** required to store it and the 0x00 seperator byte. - */ - if( addRowid ){ - pRowid = &pTos[0-nField]; - assert( pRowid>=p->aStack ); - Integerify(pRowid); - serial_type = sqlite3VdbeSerialType(pRowid); - nData += sqlite3VdbeSerialTypeLen(serial_type); - nHdr += sqlite3VarintLen(serial_type); - } - - /* Add the initial header varint and total the size */ - nHdr += nVarint = sqlite3VarintLen(nHdr); - if( nVarint<sqlite3VarintLen(nHdr) ){ - nHdr++; - } - nByte = nHdr+nData; - - /* Allocate space for the new record. */ - if( nByte>sizeof(zTemp) ){ - zNewRecord = sqliteMallocRaw(nByte); - if( !zNewRecord ){ - goto no_mem; - } - }else{ - zNewRecord = zTemp; - } - - /* Write the record */ - zCsr = zNewRecord; - zCsr += sqlite3PutVarint(zCsr, nHdr); - for(pRec=pData0; pRec<=pTos; pRec++){ - serial_type = sqlite3VdbeSerialType(pRec); - zCsr += sqlite3PutVarint(zCsr, serial_type); /* serial type */ - } - if( addRowid ){ - zCsr += sqlite3PutVarint(zCsr, sqlite3VdbeSerialType(pRowid)); - } - for(pRec=pData0; pRec<=pTos; pRec++){ - zCsr += sqlite3VdbeSerialPut(zCsr, pRec); /* serial data */ - } - if( addRowid ){ - zCsr += sqlite3VdbeSerialPut(zCsr, pRowid); - } - assert( zCsr==(zNewRecord+nByte) ); - - /* Pop entries off the stack if required. Push the new record on. */ - if( !leaveOnStack ){ - popStack(&pTos, nField+addRowid); - } - pTos++; - pTos->n = nByte; - if( nByte<=sizeof(zTemp) ){ - assert( zNewRecord==(unsigned char *)zTemp ); - pTos->z = pTos->zShort; - memcpy(pTos->zShort, zTemp, nByte); - pTos->flags = MEM_Blob | MEM_Short; - }else{ - assert( zNewRecord!=(unsigned char *)zTemp ); - pTos->z = zNewRecord; - pTos->flags = MEM_Blob | MEM_Dyn; - pTos->xDel = 0; - } - - /* If a NULL was encountered and jumpIfNull is non-zero, take the jump. */ - if( jumpIfNull && containsNull ){ - pc = jumpIfNull - 1; - } - break; -} - -/* Opcode: Statement P1 * * -** -** Begin an individual statement transaction which is part of a larger -** BEGIN..COMMIT transaction. This is needed so that the statement -** can be rolled back after an error without having to roll back the -** entire transaction. The statement transaction will automatically -** commit when the VDBE halts. -** -** The statement is begun on the database file with index P1. The main -** database file has an index of 0 and the file used for temporary tables -** has an index of 1. -*/ -case OP_Statement: { /* no-push */ - int i = pOp->p1; - Btree *pBt; - if( i>=0 && i<db->nDb && (pBt = db->aDb[i].pBt) && !(db->autoCommit) ){ - assert( sqlite3BtreeIsInTrans(pBt) ); - if( !sqlite3BtreeIsInStmt(pBt) ){ - rc = sqlite3BtreeBeginStmt(pBt); - } - } - break; -} - -/* Opcode: AutoCommit P1 P2 * -** -** Set the database auto-commit flag to P1 (1 or 0). If P2 is true, roll -** back any currently active btree transactions. If there are any active -** VMs (apart from this one), then the COMMIT or ROLLBACK statement fails. -** -** This instruction causes the VM to halt. -*/ -case OP_AutoCommit: { /* no-push */ - u8 i = pOp->p1; - u8 rollback = pOp->p2; - - assert( i==1 || i==0 ); - assert( i==1 || rollback==0 ); - - assert( db->activeVdbeCnt>0 ); /* At least this one VM is active */ - - if( db->activeVdbeCnt>1 && i && !db->autoCommit ){ - /* If this instruction implements a COMMIT or ROLLBACK, other VMs are - ** still running, and a transaction is active, return an error indicating - ** that the other VMs must complete first. - */ - sqlite3SetString(&p->zErrMsg, "cannot ", rollback?"rollback":"commit", - " transaction - SQL statements in progress", 0); - rc = SQLITE_ERROR; - }else if( i!=db->autoCommit ){ - db->autoCommit = i; - if( pOp->p2 ){ - assert( i==1 ); - sqlite3RollbackAll(db); - }else if( sqlite3VdbeHalt(p)==SQLITE_BUSY ){ - p->pTos = pTos; - p->pc = pc; - db->autoCommit = 1-i; - p->rc = SQLITE_BUSY; - return SQLITE_BUSY; - } - return SQLITE_DONE; - }else{ - sqlite3SetString(&p->zErrMsg, - (!i)?"cannot start a transaction within a transaction":( - (rollback)?"cannot rollback - no transaction is active": - "cannot commit - no transaction is active"), 0); - - rc = SQLITE_ERROR; - } - break; -} - -/* Opcode: Transaction P1 P2 * -** -** Begin a transaction. The transaction ends when a Commit or Rollback -** opcode is encountered. Depending on the ON CONFLICT setting, the -** transaction might also be rolled back if an error is encountered. -** -** P1 is the index of the database file on which the transaction is -** started. Index 0 is the main database file and index 1 is the -** file used for temporary tables. -** -** If P2 is non-zero, then a write-transaction is started. A RESERVED lock is -** obtained on the database file when a write-transaction is started. No -** other process can start another write transaction while this transaction is -** underway. Starting a write transaction also creates a rollback journal. A -** write transaction must be started before any changes can be made to the -** database. If P2 is 2 or greater then an EXCLUSIVE lock is also obtained -** on the file. -** -** If P2 is zero, then a read-lock is obtained on the database file. -*/ -case OP_Transaction: { /* no-push */ - int i = pOp->p1; - Btree *pBt; - - assert( i>=0 && i<db->nDb ); - pBt = db->aDb[i].pBt; - - if( pBt ){ - rc = sqlite3BtreeBeginTrans(pBt, pOp->p2); - if( rc==SQLITE_BUSY ){ - p->pc = pc; - p->rc = SQLITE_BUSY; - p->pTos = pTos; - return SQLITE_BUSY; - } - if( rc!=SQLITE_OK && rc!=SQLITE_READONLY /* && rc!=SQLITE_BUSY */ ){ - goto abort_due_to_error; - } - } - break; -} - -/* Opcode: ReadCookie P1 P2 * -** -** Read cookie number P2 from database P1 and push it onto the stack. -** P2==0 is the schema version. P2==1 is the database format. -** P2==2 is the recommended pager cache size, and so forth. P1==0 is -** the main database file and P1==1 is the database file used to store -** temporary tables. -** -** There must be a read-lock on the database (either a transaction -** must be started or there must be an open cursor) before -** executing this instruction. -*/ -case OP_ReadCookie: { - int iMeta; - assert( pOp->p2<SQLITE_N_BTREE_META ); - assert( pOp->p1>=0 && pOp->p1<db->nDb ); - assert( db->aDb[pOp->p1].pBt!=0 ); - /* The indexing of meta values at the schema layer is off by one from - ** the indexing in the btree layer. The btree considers meta[0] to - ** be the number of free pages in the database (a read-only value) - ** and meta[1] to be the schema cookie. The schema layer considers - ** meta[1] to be the schema cookie. So we have to shift the index - ** by one in the following statement. - */ - rc = sqlite3BtreeGetMeta(db->aDb[pOp->p1].pBt, 1 + pOp->p2, (u32 *)&iMeta); - pTos++; - pTos->i = iMeta; - pTos->flags = MEM_Int; - break; -} - -/* Opcode: SetCookie P1 P2 * -** -** Write the top of the stack into cookie number P2 of database P1. -** P2==0 is the schema version. P2==1 is the database format. -** P2==2 is the recommended pager cache size, and so forth. P1==0 is -** the main database file and P1==1 is the database file used to store -** temporary tables. -** -** A transaction must be started before executing this opcode. -*/ -case OP_SetCookie: { /* no-push */ - Db *pDb; - assert( pOp->p2<SQLITE_N_BTREE_META ); - assert( pOp->p1>=0 && pOp->p1<db->nDb ); - pDb = &db->aDb[pOp->p1]; - assert( pDb->pBt!=0 ); - assert( pTos>=p->aStack ); - Integerify(pTos); - /* See note about index shifting on OP_ReadCookie */ - rc = sqlite3BtreeUpdateMeta(pDb->pBt, 1+pOp->p2, (int)pTos->i); - if( pOp->p2==0 ){ - /* When the schema cookie changes, record the new cookie internally */ - pDb->schema_cookie = pTos->i; - db->flags |= SQLITE_InternChanges; - } - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos--; - break; -} - -/* Opcode: VerifyCookie P1 P2 * -** -** Check the value of global database parameter number 0 (the -** schema version) and make sure it is equal to P2. -** P1 is the database number which is 0 for the main database file -** and 1 for the file holding temporary tables and some higher number -** for auxiliary databases. -** -** The cookie changes its value whenever the database schema changes. -** This operation is used to detect when that the cookie has changed -** and that the current process needs to reread the schema. -** -** Either a transaction needs to have been started or an OP_Open needs -** to be executed (to establish a read lock) before this opcode is -** invoked. -*/ -case OP_VerifyCookie: { /* no-push */ - int iMeta; - Btree *pBt; - assert( pOp->p1>=0 && pOp->p1<db->nDb ); - pBt = db->aDb[pOp->p1].pBt; - if( pBt ){ - rc = sqlite3BtreeGetMeta(pBt, 1, (u32 *)&iMeta); - }else{ - rc = SQLITE_OK; - iMeta = 0; - } - if( rc==SQLITE_OK && iMeta!=pOp->p2 ){ - sqlite3SetString(&p->zErrMsg, "database schema has changed", (char*)0); - rc = SQLITE_SCHEMA; - } - break; -} - -/* Opcode: OpenRead P1 P2 P3 -** -** Open a read-only cursor for the database table whose root page is -** P2 in a database file. The database file is determined by an -** integer from the top of the stack. 0 means the main database and -** 1 means the database used for temporary tables. Give the new -** cursor an identifier of P1. The P1 values need not be contiguous -** but all P1 values should be small integers. It is an error for -** P1 to be negative. -** -** If P2==0 then take the root page number from the next of the stack. -** -** There will be a read lock on the database whenever there is an -** open cursor. If the database was unlocked prior to this instruction -** then a read lock is acquired as part of this instruction. A read -** lock allows other processes to read the database but prohibits -** any other process from modifying the database. The read lock is -** released when all cursors are closed. If this instruction attempts -** to get a read lock but fails, the script terminates with an -** SQLITE_BUSY error code. -** -** The P3 value is a pointer to a KeyInfo structure that defines the -** content and collating sequence of indices. P3 is NULL for cursors -** that are not pointing to indices. -** -** See also OpenWrite. -*/ -/* Opcode: OpenWrite P1 P2 P3 -** -** Open a read/write cursor named P1 on the table or index whose root -** page is P2. If P2==0 then take the root page number from the stack. -** -** The P3 value is a pointer to a KeyInfo structure that defines the -** content and collating sequence of indices. P3 is NULL for cursors -** that are not pointing to indices. -** -** This instruction works just like OpenRead except that it opens the cursor -** in read/write mode. For a given table, there can be one or more read-only -** cursors or a single read/write cursor but not both. -** -** See also OpenRead. -*/ -case OP_OpenRead: /* no-push */ -case OP_OpenWrite: { /* no-push */ - int i = pOp->p1; - int p2 = pOp->p2; - int wrFlag; - Btree *pX; - int iDb; - Cursor *pCur; - - assert( pTos>=p->aStack ); - Integerify(pTos); - iDb = pTos->i; - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos--; - assert( iDb>=0 && iDb<db->nDb ); - pX = db->aDb[iDb].pBt; - assert( pX!=0 ); - wrFlag = pOp->opcode==OP_OpenWrite; - if( p2<=0 ){ - assert( pTos>=p->aStack ); - Integerify(pTos); - p2 = pTos->i; - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos--; - if( p2<2 ){ - sqlite3SetString(&p->zErrMsg, "root page number less than 2", (char*)0); - rc = SQLITE_INTERNAL; - break; - } - } - assert( i>=0 ); - pCur = allocateCursor(p, i); - if( pCur==0 ) goto no_mem; - pCur->nullRow = 1; - if( pX==0 ) break; - /* We always provide a key comparison function. If the table being - ** opened is of type INTKEY, the comparision function will be ignored. */ - rc = sqlite3BtreeCursor(pX, p2, wrFlag, - sqlite3VdbeRecordCompare, pOp->p3, - &pCur->pCursor); - if( pOp->p3type==P3_KEYINFO ){ - pCur->pKeyInfo = (KeyInfo*)pOp->p3; - pCur->pIncrKey = &pCur->pKeyInfo->incrKey; - pCur->pKeyInfo->enc = p->db->enc; - }else{ - pCur->pKeyInfo = 0; - pCur->pIncrKey = &pCur->bogusIncrKey; - } - switch( rc ){ - case SQLITE_BUSY: { - p->pc = pc; - p->rc = SQLITE_BUSY; - p->pTos = &pTos[1 + (pOp->p2<=0)]; /* Operands must remain on stack */ - return SQLITE_BUSY; - } - case SQLITE_OK: { - int flags = sqlite3BtreeFlags(pCur->pCursor); - /* Sanity checking. Only the lower four bits of the flags byte should - ** be used. Bit 3 (mask 0x08) is unpreditable. The lower 3 bits - ** (mask 0x07) should be either 5 (intkey+leafdata for tables) or - ** 2 (zerodata for indices). If these conditions are not met it can - ** only mean that we are dealing with a corrupt database file - */ - if( (flags & 0xf0)!=0 || ((flags & 0x07)!=5 && (flags & 0x07)!=2) ){ - rc = SQLITE_CORRUPT; - goto abort_due_to_error; - } - pCur->isTable = (flags & BTREE_INTKEY)!=0; - pCur->isIndex = (flags & BTREE_ZERODATA)!=0; - /* If P3==0 it means we are expected to open a table. If P3!=0 then - ** we expect to be opening an index. If this is not what happened, - ** then the database is corrupt - */ - if( (pCur->isTable && pOp->p3type==P3_KEYINFO) - || (pCur->isIndex && pOp->p3type!=P3_KEYINFO) ){ - rc = SQLITE_CORRUPT; - goto abort_due_to_error; - } - break; - } - case SQLITE_EMPTY: { - pCur->isTable = pOp->p3type!=P3_KEYINFO; - pCur->isIndex = !pCur->isTable; - rc = SQLITE_OK; - break; - } - default: { - goto abort_due_to_error; - } - } - break; -} - -/* Opcode: OpenTemp P1 * P3 -** -** Open a new cursor to a transient table. -** The transient cursor is always opened read/write even if -** the main database is read-only. The transient table is deleted -** automatically when the cursor is closed. -** -** The cursor points to a BTree table if P3==0 and to a BTree index -** if P3 is not 0. If P3 is not NULL, it points to a KeyInfo structure -** that defines the format of keys in the index. -** -** This opcode is used for tables that exist for the duration of a single -** SQL statement only. Tables created using CREATE TEMPORARY TABLE -** are opened using OP_OpenRead or OP_OpenWrite. "Temporary" in the -** context of this opcode means for the duration of a single SQL statement -** whereas "Temporary" in the context of CREATE TABLE means for the duration -** of the connection to the database. Same word; different meanings. -*/ -case OP_OpenTemp: { /* no-push */ - int i = pOp->p1; - Cursor *pCx; - assert( i>=0 ); - pCx = allocateCursor(p, i); - if( pCx==0 ) goto no_mem; - pCx->nullRow = 1; - rc = sqlite3BtreeFactory(db, 0, 1, TEMP_PAGES, &pCx->pBt); - if( rc==SQLITE_OK ){ - rc = sqlite3BtreeBeginTrans(pCx->pBt, 1); - } - if( rc==SQLITE_OK ){ - /* If a transient index is required, create it by calling - ** sqlite3BtreeCreateTable() with the BTREE_ZERODATA flag before - ** opening it. If a transient table is required, just use the - ** automatically created table with root-page 1 (an INTKEY table). - */ - if( pOp->p3 ){ - int pgno; - assert( pOp->p3type==P3_KEYINFO ); - rc = sqlite3BtreeCreateTable(pCx->pBt, &pgno, BTREE_ZERODATA); - if( rc==SQLITE_OK ){ - assert( pgno==MASTER_ROOT+1 ); - rc = sqlite3BtreeCursor(pCx->pBt, pgno, 1, sqlite3VdbeRecordCompare, - pOp->p3, &pCx->pCursor); - pCx->pKeyInfo = (KeyInfo*)pOp->p3; - pCx->pKeyInfo->enc = p->db->enc; - pCx->pIncrKey = &pCx->pKeyInfo->incrKey; - } - pCx->isTable = 0; - }else{ - rc = sqlite3BtreeCursor(pCx->pBt, MASTER_ROOT, 1, 0, 0, &pCx->pCursor); - pCx->isTable = 1; - pCx->pIncrKey = &pCx->bogusIncrKey; - } - } - pCx->isIndex = !pCx->isTable; - break; -} - -#ifndef SQLITE_OMIT_TRIGGER -/* Opcode: OpenPseudo P1 * * -** -** Open a new cursor that points to a fake table that contains a single -** row of data. Any attempt to write a second row of data causes the -** first row to be deleted. All data is deleted when the cursor is -** closed. -** -** A pseudo-table created by this opcode is useful for holding the -** NEW or OLD tables in a trigger. -*/ -case OP_OpenPseudo: { /* no-push */ - int i = pOp->p1; - Cursor *pCx; - assert( i>=0 ); - pCx = allocateCursor(p, i); - if( pCx==0 ) goto no_mem; - pCx->nullRow = 1; - pCx->pseudoTable = 1; - pCx->pIncrKey = &pCx->bogusIncrKey; - pCx->isTable = 1; - pCx->isIndex = 0; - break; -} -#endif - -/* Opcode: Close P1 * * -** -** Close a cursor previously opened as P1. If P1 is not -** currently open, this instruction is a no-op. -*/ -case OP_Close: { /* no-push */ - int i = pOp->p1; - if( i>=0 && i<p->nCursor ){ - sqlite3VdbeFreeCursor(p->apCsr[i]); - p->apCsr[i] = 0; - } - break; -} - -/* Opcode: MoveGe P1 P2 * -** -** Pop the top of the stack and use its value as a key. Reposition -** cursor P1 so that it points to the smallest entry that is greater -** than or equal to the key that was popped ffrom the stack. -** If there are no records greater than or equal to the key and P2 -** is not zero, then jump to P2. -** -** See also: Found, NotFound, Distinct, MoveLt, MoveGt, MoveLe -*/ -/* Opcode: MoveGt P1 P2 * -** -** Pop the top of the stack and use its value as a key. Reposition -** cursor P1 so that it points to the smallest entry that is greater -** than the key from the stack. -** If there are no records greater than the key and P2 is not zero, -** then jump to P2. -** -** See also: Found, NotFound, Distinct, MoveLt, MoveGe, MoveLe -*/ -/* Opcode: MoveLt P1 P2 * -** -** Pop the top of the stack and use its value as a key. Reposition -** cursor P1 so that it points to the largest entry that is less -** than the key from the stack. -** If there are no records less than the key and P2 is not zero, -** then jump to P2. -** -** See also: Found, NotFound, Distinct, MoveGt, MoveGe, MoveLe -*/ -/* Opcode: MoveLe P1 P2 * -** -** Pop the top of the stack and use its value as a key. Reposition -** cursor P1 so that it points to the largest entry that is less than -** or equal to the key that was popped from the stack. -** If there are no records less than or eqal to the key and P2 is not zero, -** then jump to P2. -** -** See also: Found, NotFound, Distinct, MoveGt, MoveGe, MoveLt -*/ -case OP_MoveLt: /* no-push */ -case OP_MoveLe: /* no-push */ -case OP_MoveGe: /* no-push */ -case OP_MoveGt: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - - assert( pTos>=p->aStack ); - assert( i>=0 && i<p->nCursor ); - pC = p->apCsr[i]; - assert( pC!=0 ); - if( pC->pCursor!=0 ){ - int res, oc; - oc = pOp->opcode; - pC->nullRow = 0; - *pC->pIncrKey = oc==OP_MoveGt || oc==OP_MoveLe; - if( pC->isTable ){ - i64 iKey; - Integerify(pTos); - iKey = intToKey(pTos->i); - if( pOp->p2==0 && pOp->opcode==OP_MoveGe ){ - pC->movetoTarget = iKey; - pC->deferredMoveto = 1; - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos--; - break; - } - rc = sqlite3BtreeMoveto(pC->pCursor, 0, (u64)iKey, &res); - if( rc!=SQLITE_OK ){ - goto abort_due_to_error; - } - pC->lastRowid = pTos->i; - pC->rowidIsValid = res==0; - }else{ - Stringify(pTos, db->enc); - rc = sqlite3BtreeMoveto(pC->pCursor, pTos->z, pTos->n, &res); - if( rc!=SQLITE_OK ){ - goto abort_due_to_error; - } - pC->rowidIsValid = 0; - } - pC->deferredMoveto = 0; - pC->cacheValid = 0; - *pC->pIncrKey = 0; - sqlite3_search_count++; - if( oc==OP_MoveGe || oc==OP_MoveGt ){ - if( res<0 ){ - rc = sqlite3BtreeNext(pC->pCursor, &res); - if( rc!=SQLITE_OK ) goto abort_due_to_error; - pC->rowidIsValid = 0; - }else{ - res = 0; - } - }else{ - assert( oc==OP_MoveLt || oc==OP_MoveLe ); - if( res>=0 ){ - rc = sqlite3BtreePrevious(pC->pCursor, &res); - if( rc!=SQLITE_OK ) goto abort_due_to_error; - pC->rowidIsValid = 0; - }else{ - /* res might be negative because the table is empty. Check to - ** see if this is the case. - */ - res = sqlite3BtreeEof(pC->pCursor); - } - } - if( res ){ - if( pOp->p2>0 ){ - pc = pOp->p2 - 1; - }else{ - pC->nullRow = 1; - } - } - } - Release(pTos); - pTos--; - break; -} - -/* Opcode: Distinct P1 P2 * -** -** Use the top of the stack as a record created using MakeRecord. P1 is a -** cursor on a table that declared as an index. If that table contains an -** entry that matches the top of the stack fall thru. If the top of the stack -** matches no entry in P1 then jump to P2. -** -** The cursor is left pointing at the matching entry if it exists. The -** record on the top of the stack is not popped. -** -** This instruction is similar to NotFound except that this operation -** does not pop the key from the stack. -** -** The instruction is used to implement the DISTINCT operator on SELECT -** statements. The P1 table is not a true index but rather a record of -** all results that have produced so far. -** -** See also: Found, NotFound, MoveTo, IsUnique, NotExists -*/ -/* Opcode: Found P1 P2 * -** -** Top of the stack holds a blob constructed by MakeRecord. P1 is an index. -** If an entry that matches the top of the stack exists in P1 then -** jump to P2. If the top of the stack does not match any entry in P1 -** then fall thru. The P1 cursor is left pointing at the matching entry -** if it exists. The blob is popped off the top of the stack. -** -** This instruction is used to implement the IN operator where the -** left-hand side is a SELECT statement. P1 is not a true index but -** is instead a temporary index that holds the results of the SELECT -** statement. This instruction just checks to see if the left-hand side -** of the IN operator (stored on the top of the stack) exists in the -** result of the SELECT statement. -** -** See also: Distinct, NotFound, MoveTo, IsUnique, NotExists -*/ -/* Opcode: NotFound P1 P2 * -** -** The top of the stack holds a blob constructed by MakeRecord. P1 is -** an index. If no entry exists in P1 that matches the blob then jump -** to P1. If an entry does existing, fall through. The cursor is left -** pointing to the entry that matches. The blob is popped from the stack. -** -** The difference between this operation and Distinct is that -** Distinct does not pop the key from the stack. -** -** See also: Distinct, Found, MoveTo, NotExists, IsUnique -*/ -case OP_Distinct: /* no-push */ -case OP_NotFound: /* no-push */ -case OP_Found: { /* no-push */ - int i = pOp->p1; - int alreadyExists = 0; - Cursor *pC; - assert( pTos>=p->aStack ); - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - if( (pC = p->apCsr[i])->pCursor!=0 ){ - int res, rx; - assert( pC->isTable==0 ); - Stringify(pTos, db->enc); - rx = sqlite3BtreeMoveto(pC->pCursor, pTos->z, pTos->n, &res); - alreadyExists = rx==SQLITE_OK && res==0; - pC->deferredMoveto = 0; - pC->cacheValid = 0; - } - if( pOp->opcode==OP_Found ){ - if( alreadyExists ) pc = pOp->p2 - 1; - }else{ - if( !alreadyExists ) pc = pOp->p2 - 1; - } - if( pOp->opcode!=OP_Distinct ){ - Release(pTos); - pTos--; - } - break; -} - -/* Opcode: IsUnique P1 P2 * -** -** The top of the stack is an integer record number. Call this -** record number R. The next on the stack is an index key created -** using MakeIdxKey. Call it K. This instruction pops R from the -** stack but it leaves K unchanged. -** -** P1 is an index. So it has no data and its key consists of a -** record generated by OP_MakeRecord where the last field is the -** rowid of the entry that the index refers to. -** -** This instruction asks if there is an entry in P1 where the -** fields matches K but the rowid is different from R. -** If there is no such entry, then there is an immediate -** jump to P2. If any entry does exist where the index string -** matches K but the record number is not R, then the record -** number for that entry is pushed onto the stack and control -** falls through to the next instruction. -** -** See also: Distinct, NotFound, NotExists, Found -*/ -case OP_IsUnique: { /* no-push */ - int i = pOp->p1; - Mem *pNos = &pTos[-1]; - Cursor *pCx; - BtCursor *pCrsr; - i64 R; - - /* Pop the value R off the top of the stack - */ - assert( pNos>=p->aStack ); - Integerify(pTos); - R = pTos->i; - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos--; - assert( i>=0 && i<=p->nCursor ); - pCx = p->apCsr[i]; - assert( pCx!=0 ); - pCrsr = pCx->pCursor; - if( pCrsr!=0 ){ - int res, rc; - i64 v; /* The record number on the P1 entry that matches K */ - char *zKey; /* The value of K */ - int nKey; /* Number of bytes in K */ - int len; /* Number of bytes in K without the rowid at the end */ - int szRowid; /* Size of the rowid column at the end of zKey */ - - /* Make sure K is a string and make zKey point to K - */ - Stringify(pNos, db->enc); - zKey = pNos->z; - nKey = pNos->n; - - szRowid = sqlite3VdbeIdxRowidLen(nKey, zKey); - len = nKey-szRowid; - - /* Search for an entry in P1 where all but the last four bytes match K. - ** If there is no such entry, jump immediately to P2. - */ - assert( pCx->deferredMoveto==0 ); - pCx->cacheValid = 0; - rc = sqlite3BtreeMoveto(pCrsr, zKey, len, &res); - if( rc!=SQLITE_OK ) goto abort_due_to_error; - if( res<0 ){ - rc = sqlite3BtreeNext(pCrsr, &res); - if( res ){ - pc = pOp->p2 - 1; - break; - } - } - rc = sqlite3VdbeIdxKeyCompare(pCx, len, zKey, &res); - if( rc!=SQLITE_OK ) goto abort_due_to_error; - if( res>0 ){ - pc = pOp->p2 - 1; - break; - } - - /* At this point, pCrsr is pointing to an entry in P1 where all but - ** the final entry (the rowid) matches K. Check to see if the - ** final rowid column is different from R. If it equals R then jump - ** immediately to P2. - */ - rc = sqlite3VdbeIdxRowid(pCrsr, &v); - if( rc!=SQLITE_OK ){ - goto abort_due_to_error; - } - if( v==R ){ - pc = pOp->p2 - 1; - break; - } - - /* The final varint of the key is different from R. Push it onto - ** the stack. (The record number of an entry that violates a UNIQUE - ** constraint.) - */ - pTos++; - pTos->i = v; - pTos->flags = MEM_Int; - } - break; -} - -/* Opcode: NotExists P1 P2 * -** -** Use the top of the stack as a integer key. If a record with that key -** does not exist in table of P1, then jump to P2. If the record -** does exist, then fall thru. The cursor is left pointing to the -** record if it exists. The integer key is popped from the stack. -** -** The difference between this operation and NotFound is that this -** operation assumes the key is an integer and that P1 is a table whereas -** NotFound assumes key is a blob constructed from MakeRecord and -** P1 is an index. -** -** See also: Distinct, Found, MoveTo, NotFound, IsUnique -*/ -case OP_NotExists: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - BtCursor *pCrsr; - assert( pTos>=p->aStack ); - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - if( (pCrsr = (pC = p->apCsr[i])->pCursor)!=0 ){ - int res; - u64 iKey; - assert( pTos->flags & MEM_Int ); - assert( p->apCsr[i]->isTable ); - iKey = intToKey(pTos->i); - rc = sqlite3BtreeMoveto(pCrsr, 0, iKey, &res); - pC->lastRowid = pTos->i; - pC->rowidIsValid = res==0; - pC->nullRow = 0; - pC->cacheValid = 0; - if( res!=0 ){ - pc = pOp->p2 - 1; - pC->rowidIsValid = 0; - } - } - Release(pTos); - pTos--; - break; -} - -/* Opcode: NewRowid P1 P2 * -** -** Get a new integer record number (a.k.a "rowid") used as the key to a table. -** The record number is not previously used as a key in the database -** table that cursor P1 points to. The new record number is pushed -** onto the stack. -** -** If P2>0 then P2 is a memory cell that holds the largest previously -** generated record number. No new record numbers are allowed to be less -** than this value. When this value reaches its maximum, a SQLITE_FULL -** error is generated. The P2 memory cell is updated with the generated -** record number. This P2 mechanism is used to help implement the -** AUTOINCREMENT feature. -*/ -case OP_NewRowid: { - int i = pOp->p1; - i64 v = 0; - Cursor *pC; - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - if( (pC = p->apCsr[i])->pCursor==0 ){ - /* The zero initialization above is all that is needed */ - }else{ - /* The next rowid or record number (different terms for the same - ** thing) is obtained in a two-step algorithm. - ** - ** First we attempt to find the largest existing rowid and add one - ** to that. But if the largest existing rowid is already the maximum - ** positive integer, we have to fall through to the second - ** probabilistic algorithm - ** - ** The second algorithm is to select a rowid at random and see if - ** it already exists in the table. If it does not exist, we have - ** succeeded. If the random rowid does exist, we select a new one - ** and try again, up to 1000 times. - ** - ** For a table with less than 2 billion entries, the probability - ** of not finding a unused rowid is about 1.0e-300. This is a - ** non-zero probability, but it is still vanishingly small and should - ** never cause a problem. You are much, much more likely to have a - ** hardware failure than for this algorithm to fail. - ** - ** The analysis in the previous paragraph assumes that you have a good - ** source of random numbers. Is a library function like lrand48() - ** good enough? Maybe. Maybe not. It's hard to know whether there - ** might be subtle bugs is some implementations of lrand48() that - ** could cause problems. To avoid uncertainty, SQLite uses its own - ** random number generator based on the RC4 algorithm. - ** - ** To promote locality of reference for repetitive inserts, the - ** first few attempts at chosing a random rowid pick values just a little - ** larger than the previous rowid. This has been shown experimentally - ** to double the speed of the COPY operation. - */ - int res, rx=SQLITE_OK, cnt; - i64 x; - cnt = 0; - if( (sqlite3BtreeFlags(pC->pCursor)&(BTREE_INTKEY|BTREE_ZERODATA)) != - BTREE_INTKEY ){ - rc = SQLITE_CORRUPT; - goto abort_due_to_error; - } - assert( (sqlite3BtreeFlags(pC->pCursor) & BTREE_INTKEY)!=0 ); - assert( (sqlite3BtreeFlags(pC->pCursor) & BTREE_ZERODATA)==0 ); - -#ifdef SQLITE_32BIT_ROWID -# define MAX_ROWID 0x7fffffff -#else - /* Some compilers complain about constants of the form 0x7fffffffffffffff. - ** Others complain about 0x7ffffffffffffffffLL. The following macro seems - ** to provide the constant while making all compilers happy. - */ -# define MAX_ROWID ( (((u64)0x7fffffff)<<32) | (u64)0xffffffff ) -#endif - - if( !pC->useRandomRowid ){ - if( pC->nextRowidValid ){ - v = pC->nextRowid; - }else{ - rx = sqlite3BtreeLast(pC->pCursor, &res); - if( res ){ - v = 1; - }else{ - sqlite3BtreeKeySize(pC->pCursor, &v); - v = keyToInt(v); - if( v==MAX_ROWID ){ - pC->useRandomRowid = 1; - }else{ - v++; - } - } - } - -#ifndef SQLITE_OMIT_AUTOINCREMENT - if( pOp->p2 ){ - Mem *pMem; - assert( pOp->p2>0 && pOp->p2<p->nMem ); /* P2 is a valid memory cell */ - pMem = &p->aMem[pOp->p2]; - Integerify(pMem); - assert( (pMem->flags & MEM_Int)!=0 ); /* mem(P2) holds an integer */ - if( pMem->i==MAX_ROWID || pC->useRandomRowid ){ - rc = SQLITE_FULL; - goto abort_due_to_error; - } - if( v<pMem->i+1 ){ - v = pMem->i + 1; - } - pMem->i = v; - } -#endif - - if( v<MAX_ROWID ){ - pC->nextRowidValid = 1; - pC->nextRowid = v+1; - }else{ - pC->nextRowidValid = 0; - } - } - if( pC->useRandomRowid ){ - assert( pOp->p2==0 ); /* SQLITE_FULL must have occurred prior to this */ - v = db->priorNewRowid; - cnt = 0; - do{ - if( v==0 || cnt>2 ){ - sqlite3Randomness(sizeof(v), &v); - if( cnt<5 ) v &= 0xffffff; - }else{ - unsigned char r; - sqlite3Randomness(1, &r); - v += r + 1; - } - if( v==0 ) continue; - x = intToKey(v); - rx = sqlite3BtreeMoveto(pC->pCursor, 0, (u64)x, &res); - cnt++; - }while( cnt<1000 && rx==SQLITE_OK && res==0 ); - db->priorNewRowid = v; - if( rx==SQLITE_OK && res==0 ){ - rc = SQLITE_FULL; - goto abort_due_to_error; - } - } - pC->rowidIsValid = 0; - pC->deferredMoveto = 0; - pC->cacheValid = 0; - } - pTos++; - pTos->i = v; - pTos->flags = MEM_Int; - break; -} - -/* Opcode: Insert P1 P2 * -** -** Write an entry into the table of cursor P1. A new entry is -** created if it doesn't already exist or the data for an existing -** entry is overwritten. The data is the value on the top of the -** stack. The key is the next value down on the stack. The key must -** be an integer. The stack is popped twice by this instruction. -** -** If the OPFLAG_NCHANGE flag of P2 is set, then the row change count is -** incremented (otherwise not). If the OPFLAG_LASTROWID flag of P2 is set, -** then rowid is stored for subsequent return by the -** sqlite3_last_insert_rowid() function (otherwise it's unmodified). -** -** This instruction only works on tables. The equivalent instruction -** for indices is OP_IdxInsert. -*/ -case OP_Insert: { /* no-push */ - Mem *pNos = &pTos[-1]; - int i = pOp->p1; - Cursor *pC; - assert( pNos>=p->aStack ); - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - if( ((pC = p->apCsr[i])->pCursor!=0 || pC->pseudoTable) ){ - i64 iKey; /* The integer ROWID or key for the record to be inserted */ - - assert( pNos->flags & MEM_Int ); - assert( pC->isTable ); - iKey = intToKey(pNos->i); - - if( pOp->p2 & OPFLAG_NCHANGE ) p->nChange++; - if( pOp->p2 & OPFLAG_LASTROWID ) db->lastRowid = pNos->i; - if( pC->nextRowidValid && pTos->i>=pC->nextRowid ){ - pC->nextRowidValid = 0; - } - if( pTos->flags & MEM_Null ){ - pTos->z = 0; - pTos->n = 0; - }else{ - assert( pTos->flags & (MEM_Blob|MEM_Str) ); - } -#ifndef SQLITE_OMIT_TRIGGER - if( pC->pseudoTable ){ - sqliteFree(pC->pData); - pC->iKey = iKey; - pC->nData = pTos->n; - if( pTos->flags & MEM_Dyn ){ - pC->pData = pTos->z; - pTos->flags = MEM_Null; - }else{ - pC->pData = sqliteMallocRaw( pC->nData+2 ); - if( !pC->pData ) goto no_mem; - memcpy(pC->pData, pTos->z, pC->nData); - pC->pData[pC->nData] = 0; - pC->pData[pC->nData+1] = 0; - } - pC->nullRow = 0; - }else{ -#endif - rc = sqlite3BtreeInsert(pC->pCursor, 0, iKey, pTos->z, pTos->n); -#ifndef SQLITE_OMIT_TRIGGER - } -#endif - - pC->rowidIsValid = 0; - pC->deferredMoveto = 0; - pC->cacheValid = 0; - } - popStack(&pTos, 2); - break; -} - -/* Opcode: Delete P1 P2 * -** -** Delete the record at which the P1 cursor is currently pointing. -** -** The cursor will be left pointing at either the next or the previous -** record in the table. If it is left pointing at the next record, then -** the next Next instruction will be a no-op. Hence it is OK to delete -** a record from within an Next loop. -** -** If the OPFLAG_NCHANGE flag of P2 is set, then the row change count is -** incremented (otherwise not). -** -** If P1 is a pseudo-table, then this instruction is a no-op. -*/ -case OP_Delete: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - assert( i>=0 && i<p->nCursor ); - pC = p->apCsr[i]; - assert( pC!=0 ); - if( pC->pCursor!=0 ){ - rc = sqlite3VdbeCursorMoveto(pC); - if( rc ) goto abort_due_to_error; - rc = sqlite3BtreeDelete(pC->pCursor); - pC->nextRowidValid = 0; - pC->cacheValid = 0; - } - if( pOp->p2 & OPFLAG_NCHANGE ) p->nChange++; - break; -} - -/* Opcode: ResetCount P1 * * -** -** This opcode resets the VMs internal change counter to 0. If P1 is true, -** then the value of the change counter is copied to the database handle -** change counter (returned by subsequent calls to sqlite3_changes()) -** before it is reset. This is used by trigger programs. -*/ -case OP_ResetCount: { /* no-push */ - if( pOp->p1 ){ - sqlite3VdbeSetChanges(db, p->nChange); - } - p->nChange = 0; - break; -} - -/* Opcode: RowData P1 * * -** -** Push onto the stack the complete row data for cursor P1. -** There is no interpretation of the data. It is just copied -** onto the stack exactly as it is found in the database file. -** -** If the cursor is not pointing to a valid row, a NULL is pushed -** onto the stack. -*/ -/* Opcode: RowKey P1 * * -** -** Push onto the stack the complete row key for cursor P1. -** There is no interpretation of the key. It is just copied -** onto the stack exactly as it is found in the database file. -** -** If the cursor is not pointing to a valid row, a NULL is pushed -** onto the stack. -*/ -case OP_RowKey: -case OP_RowData: { - int i = pOp->p1; - Cursor *pC; - u32 n; - - /* Note that RowKey and RowData are really exactly the same instruction */ - pTos++; - assert( i>=0 && i<p->nCursor ); - pC = p->apCsr[i]; - assert( pC->isTable || pOp->opcode==OP_RowKey ); - assert( pC->isIndex || pOp->opcode==OP_RowData ); - assert( pC!=0 ); - if( pC->nullRow ){ - pTos->flags = MEM_Null; - }else if( pC->pCursor!=0 ){ - BtCursor *pCrsr = pC->pCursor; - rc = sqlite3VdbeCursorMoveto(pC); - if( rc ) goto abort_due_to_error; - if( pC->nullRow ){ - pTos->flags = MEM_Null; - break; - }else if( pC->isIndex ){ - i64 n64; - assert( !pC->isTable ); - sqlite3BtreeKeySize(pCrsr, &n64); - n = n64; - }else{ - sqlite3BtreeDataSize(pCrsr, &n); - } - pTos->n = n; - if( n<=NBFS ){ - pTos->flags = MEM_Blob | MEM_Short; - pTos->z = pTos->zShort; - }else{ - char *z = sqliteMallocRaw( n ); - if( z==0 ) goto no_mem; - pTos->flags = MEM_Blob | MEM_Dyn; - pTos->xDel = 0; - pTos->z = z; - } - if( pC->isIndex ){ - sqlite3BtreeKey(pCrsr, 0, n, pTos->z); - }else{ - sqlite3BtreeData(pCrsr, 0, n, pTos->z); - } -#ifndef SQLITE_OMIT_TRIGGER - }else if( pC->pseudoTable ){ - pTos->n = pC->nData; - pTos->z = pC->pData; - pTos->flags = MEM_Blob|MEM_Ephem; -#endif - }else{ - pTos->flags = MEM_Null; - } - break; -} - -/* Opcode: Rowid P1 * * -** -** Push onto the stack an integer which is the key of the table entry that -** P1 is currently point to. -*/ -case OP_Rowid: { - int i = pOp->p1; - Cursor *pC; - i64 v; - - assert( i>=0 && i<p->nCursor ); - pC = p->apCsr[i]; - assert( pC!=0 ); - rc = sqlite3VdbeCursorMoveto(pC); - if( rc ) goto abort_due_to_error; - pTos++; - if( pC->rowidIsValid ){ - v = pC->lastRowid; - }else if( pC->pseudoTable ){ - v = keyToInt(pC->iKey); - }else if( pC->nullRow || pC->pCursor==0 ){ - pTos->flags = MEM_Null; - break; - }else{ - assert( pC->pCursor!=0 ); - sqlite3BtreeKeySize(pC->pCursor, &v); - v = keyToInt(v); - } - pTos->i = v; - pTos->flags = MEM_Int; - break; -} - -/* Opcode: NullRow P1 * * -** -** Move the cursor P1 to a null row. Any OP_Column operations -** that occur while the cursor is on the null row will always push -** a NULL onto the stack. -*/ -case OP_NullRow: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - - assert( i>=0 && i<p->nCursor ); - pC = p->apCsr[i]; - assert( pC!=0 ); - pC->nullRow = 1; - pC->rowidIsValid = 0; - break; -} - -/* Opcode: Last P1 P2 * -** -** The next use of the Rowid or Column or Next instruction for P1 -** will refer to the last entry in the database table or index. -** If the table or index is empty and P2>0, then jump immediately to P2. -** If P2 is 0 or if the table or index is not empty, fall through -** to the following instruction. -*/ -case OP_Last: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - BtCursor *pCrsr; - - assert( i>=0 && i<p->nCursor ); - pC = p->apCsr[i]; - assert( pC!=0 ); - if( (pCrsr = pC->pCursor)!=0 ){ - int res; - rc = sqlite3BtreeLast(pCrsr, &res); - pC->nullRow = res; - pC->deferredMoveto = 0; - pC->cacheValid = 0; - if( res && pOp->p2>0 ){ - pc = pOp->p2 - 1; - } - }else{ - pC->nullRow = 0; - } - break; -} - -/* Opcode: Rewind P1 P2 * -** -** The next use of the Rowid or Column or Next instruction for P1 -** will refer to the first entry in the database table or index. -** If the table or index is empty and P2>0, then jump immediately to P2. -** If P2 is 0 or if the table or index is not empty, fall through -** to the following instruction. -*/ -case OP_Rewind: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - BtCursor *pCrsr; - int res; - - assert( i>=0 && i<p->nCursor ); - pC = p->apCsr[i]; - assert( pC!=0 ); - if( (pCrsr = pC->pCursor)!=0 ){ - rc = sqlite3BtreeFirst(pCrsr, &res); - pC->atFirst = res==0; - pC->deferredMoveto = 0; - pC->cacheValid = 0; - }else{ - res = 1; - } - pC->nullRow = res; - if( res && pOp->p2>0 ){ - pc = pOp->p2 - 1; - } - break; -} - -/* Opcode: Next P1 P2 * -** -** Advance cursor P1 so that it points to the next key/data pair in its -** table or index. If there are no more key/value pairs then fall through -** to the following instruction. But if the cursor advance was successful, -** jump immediately to P2. -** -** See also: Prev -*/ -/* Opcode: Prev P1 P2 * -** -** Back up cursor P1 so that it points to the previous key/data pair in its -** table or index. If there is no previous key/value pairs then fall through -** to the following instruction. But if the cursor backup was successful, -** jump immediately to P2. -*/ -case OP_Prev: /* no-push */ -case OP_Next: { /* no-push */ - Cursor *pC; - BtCursor *pCrsr; - - CHECK_FOR_INTERRUPT; - assert( pOp->p1>=0 && pOp->p1<p->nCursor ); - pC = p->apCsr[pOp->p1]; - assert( pC!=0 ); - if( (pCrsr = pC->pCursor)!=0 ){ - int res; - if( pC->nullRow ){ - res = 1; - }else{ - assert( pC->deferredMoveto==0 ); - rc = pOp->opcode==OP_Next ? sqlite3BtreeNext(pCrsr, &res) : - sqlite3BtreePrevious(pCrsr, &res); - pC->nullRow = res; - pC->cacheValid = 0; - } - if( res==0 ){ - pc = pOp->p2 - 1; - sqlite3_search_count++; - } - }else{ - pC->nullRow = 1; - } - pC->rowidIsValid = 0; - break; -} - -/* Opcode: IdxInsert P1 P2 P3 -** -** The top of the stack holds a SQL index key made using the -** MakeIdxKey instruction. This opcode writes that key into the -** index P1. Data for the entry is nil. -** -** If P2==1, then the key must be unique. If the key is not unique, -** the program aborts with a SQLITE_CONSTRAINT error and the database -** is rolled back. If P3 is not null, then it becomes part of the -** error message returned with the SQLITE_CONSTRAINT. -** -** This instruction only works for indices. The equivalent instruction -** for tables is OP_Insert. -*/ -case OP_IdxInsert: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - BtCursor *pCrsr; - assert( pTos>=p->aStack ); - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - assert( pTos->flags & MEM_Blob ); - if( (pCrsr = (pC = p->apCsr[i])->pCursor)!=0 ){ - int nKey = pTos->n; - const char *zKey = pTos->z; - if( pOp->p2 ){ - int res; - int len; - - /* 'len' is the length of the key minus the rowid at the end */ - len = nKey - sqlite3VdbeIdxRowidLen(nKey, zKey); - - rc = sqlite3BtreeMoveto(pCrsr, zKey, len, &res); - if( rc!=SQLITE_OK ) goto abort_due_to_error; - while( res!=0 && !sqlite3BtreeEof(pCrsr) ){ - int c; - if( sqlite3VdbeIdxKeyCompare(pC, len, zKey, &c)==SQLITE_OK && c==0 ){ - rc = SQLITE_CONSTRAINT; - if( pOp->p3 && pOp->p3[0] ){ - sqlite3SetString(&p->zErrMsg, pOp->p3, (char*)0); - } - goto abort_due_to_error; - } - if( res<0 ){ - sqlite3BtreeNext(pCrsr, &res); - res = +1; - }else{ - break; - } - } - } - assert( pC->isTable==0 ); - rc = sqlite3BtreeInsert(pCrsr, zKey, nKey, "", 0); - assert( pC->deferredMoveto==0 ); - pC->cacheValid = 0; - } - Release(pTos); - pTos--; - break; -} - -/* Opcode: IdxDelete P1 * * -** -** The top of the stack is an index key built using the MakeIdxKey opcode. -** This opcode removes that entry from the index. -*/ -case OP_IdxDelete: { /* no-push */ - int i = pOp->p1; - Cursor *pC; - BtCursor *pCrsr; - assert( pTos>=p->aStack ); - assert( pTos->flags & MEM_Blob ); - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - if( (pCrsr = (pC = p->apCsr[i])->pCursor)!=0 ){ - int rx, res; - rx = sqlite3BtreeMoveto(pCrsr, pTos->z, pTos->n, &res); - if( rx==SQLITE_OK && res==0 ){ - rc = sqlite3BtreeDelete(pCrsr); - } - assert( pC->deferredMoveto==0 ); - pC->cacheValid = 0; - } - Release(pTos); - pTos--; - break; -} - -/* Opcode: IdxRowid P1 * * -** -** Push onto the stack an integer which is the last entry in the record at -** the end of the index key pointed to by cursor P1. This integer should be -** the rowid of the table entry to which this index entry points. -** -** See also: Rowid, MakeIdxKey. -*/ -case OP_IdxRowid: { - int i = pOp->p1; - BtCursor *pCrsr; - Cursor *pC; - - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - pTos++; - pTos->flags = MEM_Null; - if( (pCrsr = (pC = p->apCsr[i])->pCursor)!=0 ){ - i64 rowid; - - assert( pC->deferredMoveto==0 ); - assert( pC->isTable==0 ); - if( pC->nullRow ){ - pTos->flags = MEM_Null; - }else{ - rc = sqlite3VdbeIdxRowid(pCrsr, &rowid); - if( rc!=SQLITE_OK ){ - goto abort_due_to_error; - } - pTos->flags = MEM_Int; - pTos->i = rowid; - } - } - break; -} - -/* Opcode: IdxGT P1 P2 * -** -** The top of the stack is an index entry that omits the ROWID. Compare -** the top of stack against the index that P1 is currently pointing to. -** Ignore the ROWID on the P1 index. -** -** The top of the stack might have fewer columns that P1. -** -** If the P1 index entry is greater than the top of the stack -** then jump to P2. Otherwise fall through to the next instruction. -** In either case, the stack is popped once. -*/ -/* Opcode: IdxGE P1 P2 P3 -** -** The top of the stack is an index entry that omits the ROWID. Compare -** the top of stack against the index that P1 is currently pointing to. -** Ignore the ROWID on the P1 index. -** -** If the P1 index entry is greater than or equal to the top of the stack -** then jump to P2. Otherwise fall through to the next instruction. -** In either case, the stack is popped once. -** -** If P3 is the "+" string (or any other non-NULL string) then the -** index taken from the top of the stack is temporarily increased by -** an epsilon prior to the comparison. This make the opcode work -** like IdxGT except that if the key from the stack is a prefix of -** the key in the cursor, the result is false whereas it would be -** true with IdxGT. -*/ -/* Opcode: IdxLT P1 P2 P3 -** -** The top of the stack is an index entry that omits the ROWID. Compare -** the top of stack against the index that P1 is currently pointing to. -** Ignore the ROWID on the P1 index. -** -** If the P1 index entry is less than the top of the stack -** then jump to P2. Otherwise fall through to the next instruction. -** In either case, the stack is popped once. -** -** If P3 is the "+" string (or any other non-NULL string) then the -** index taken from the top of the stack is temporarily increased by -** an epsilon prior to the comparison. This makes the opcode work -** like IdxLE. -*/ -case OP_IdxLT: /* no-push */ -case OP_IdxGT: /* no-push */ -case OP_IdxGE: { /* no-push */ - int i= pOp->p1; - BtCursor *pCrsr; - Cursor *pC; - - assert( i>=0 && i<p->nCursor ); - assert( p->apCsr[i]!=0 ); - assert( pTos>=p->aStack ); - if( (pCrsr = (pC = p->apCsr[i])->pCursor)!=0 ){ - int res, rc; - - assert( pTos->flags & MEM_Blob ); /* Created using OP_Make*Key */ - Stringify(pTos, db->enc); - assert( pC->deferredMoveto==0 ); - *pC->pIncrKey = pOp->p3!=0; - assert( pOp->p3==0 || pOp->opcode!=OP_IdxGT ); - rc = sqlite3VdbeIdxKeyCompare(pC, pTos->n, pTos->z, &res); - *pC->pIncrKey = 0; - if( rc!=SQLITE_OK ){ - break; - } - if( pOp->opcode==OP_IdxLT ){ - res = -res; - }else if( pOp->opcode==OP_IdxGE ){ - res++; - } - if( res>0 ){ - pc = pOp->p2 - 1 ; - } - } - Release(pTos); - pTos--; - break; -} - -/* Opcode: IdxIsNull P1 P2 * -** -** The top of the stack contains an index entry such as might be generated -** by the MakeIdxKey opcode. This routine looks at the first P1 fields of -** that key. If any of the first P1 fields are NULL, then a jump is made -** to address P2. Otherwise we fall straight through. -** -** The index entry is always popped from the stack. -*/ -case OP_IdxIsNull: { /* no-push */ - int i = pOp->p1; - int k, n; - const char *z; - u32 serial_type; - - assert( pTos>=p->aStack ); - assert( pTos->flags & MEM_Blob ); - z = pTos->z; - n = pTos->n; - k = sqlite3GetVarint32(z, &serial_type); - for(; k<n && i>0; i--){ - k += sqlite3GetVarint32(&z[k], &serial_type); - if( serial_type==0 ){ /* Serial type 0 is a NULL */ - pc = pOp->p2-1; - break; - } - } - Release(pTos); - pTos--; - break; -} - -/* Opcode: Destroy P1 P2 * -** -** Delete an entire database table or index whose root page in the database -** file is given by P1. -** -** The table being destroyed is in the main database file if P2==0. If -** P2==1 then the table to be clear is in the auxiliary database file -** that is used to store tables create using CREATE TEMPORARY TABLE. -** -** If AUTOVACUUM is enabled then it is possible that another root page -** might be moved into the newly deleted root page in order to keep all -** root pages contiguous at the beginning of the database. The former -** value of the root page that moved - its value before the move occurred - -** is pushed onto the stack. If no page movement was required (because -** the table being dropped was already the last one in the database) then -** a zero is pushed onto the stack. If AUTOVACUUM is disabled -** then a zero is pushed onto the stack. -** -** See also: Clear -*/ -case OP_Destroy: { - int iMoved; - if( db->activeVdbeCnt>1 ){ - rc = SQLITE_LOCKED; - }else{ - assert( db->activeVdbeCnt==1 ); - rc = sqlite3BtreeDropTable(db->aDb[pOp->p2].pBt, pOp->p1, &iMoved); - pTos++; - pTos->flags = MEM_Int; - pTos->i = iMoved; - #ifndef SQLITE_OMIT_AUTOVACUUM - if( rc==SQLITE_OK && iMoved!=0 ){ - sqlite3RootPageMoved(&db->aDb[pOp->p2], iMoved, pOp->p1); - } - #endif - } - break; -} - -/* Opcode: Clear P1 P2 * -** -** Delete all contents of the database table or index whose root page -** in the database file is given by P1. But, unlike Destroy, do not -** remove the table or index from the database file. -** -** The table being clear is in the main database file if P2==0. If -** P2==1 then the table to be clear is in the auxiliary database file -** that is used to store tables create using CREATE TEMPORARY TABLE. -** -** See also: Destroy -*/ -case OP_Clear: { /* no-push */ - rc = sqlite3BtreeClearTable(db->aDb[pOp->p2].pBt, pOp->p1); - break; -} - -/* Opcode: CreateTable P1 * * -** -** Allocate a new table in the main database file if P2==0 or in the -** auxiliary database file if P2==1. Push the page number -** for the root page of the new table onto the stack. -** -** The difference between a table and an index is this: A table must -** have a 4-byte integer key and can have arbitrary data. An index -** has an arbitrary key but no data. -** -** See also: CreateIndex -*/ -/* Opcode: CreateIndex P1 * * -** -** Allocate a new index in the main database file if P2==0 or in the -** auxiliary database file if P2==1. Push the page number of the -** root page of the new index onto the stack. -** -** See documentation on OP_CreateTable for additional information. -*/ -case OP_CreateIndex: -case OP_CreateTable: { - int pgno; - int flags; - Db *pDb; - assert( pOp->p1>=0 && pOp->p1<db->nDb ); - pDb = &db->aDb[pOp->p1]; - assert( pDb->pBt!=0 ); - if( pOp->opcode==OP_CreateTable ){ - /* flags = BTREE_INTKEY; */ - flags = BTREE_LEAFDATA|BTREE_INTKEY; - }else{ - flags = BTREE_ZERODATA; - } - rc = sqlite3BtreeCreateTable(pDb->pBt, &pgno, flags); - pTos++; - if( rc==SQLITE_OK ){ - pTos->i = pgno; - pTos->flags = MEM_Int; - }else{ - pTos->flags = MEM_Null; - } - break; -} - -/* Opcode: ParseSchema P1 * P3 -** -** Read and parse all entries from the SQLITE_MASTER table of database P1 -** that match the WHERE clause P3. -** -** This opcode invokes the parser to create a new virtual machine, -** then runs the new virtual machine. It is thus a reentrant opcode. -*/ -case OP_ParseSchema: { /* no-push */ - char *zSql; - int iDb = pOp->p1; - const char *zMaster; - InitData initData; - - assert( iDb>=0 && iDb<db->nDb ); - if( !DbHasProperty(db, iDb, DB_SchemaLoaded) ) break; - zMaster = SCHEMA_TABLE(iDb); - initData.db = db; - initData.pzErrMsg = &p->zErrMsg; - zSql = sqlite3MPrintf( - "SELECT name, rootpage, sql, %d FROM '%q'.%s WHERE %s", - pOp->p1, db->aDb[iDb].zName, zMaster, pOp->p3); - if( zSql==0 ) goto no_mem; - sqlite3SafetyOff(db); - assert( db->init.busy==0 ); - db->init.busy = 1; - rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0); - db->init.busy = 0; - sqlite3SafetyOn(db); - sqliteFree(zSql); - break; -} - -/* Opcode: DropTable P1 * P3 -** -** Remove the internal (in-memory) data structures that describe -** the table named P3 in database P1. This is called after a table -** is dropped in order to keep the internal representation of the -** schema consistent with what is on disk. -*/ -case OP_DropTable: { /* no-push */ - sqlite3UnlinkAndDeleteTable(db, pOp->p1, pOp->p3); - break; -} - -/* Opcode: DropIndex P1 * P3 -** -** Remove the internal (in-memory) data structures that describe -** the index named P3 in database P1. This is called after an index -** is dropped in order to keep the internal representation of the -** schema consistent with what is on disk. -*/ -case OP_DropIndex: { /* no-push */ - sqlite3UnlinkAndDeleteIndex(db, pOp->p1, pOp->p3); - break; -} - -/* Opcode: DropTrigger P1 * P3 -** -** Remove the internal (in-memory) data structures that describe -** the trigger named P3 in database P1. This is called after a trigger -** is dropped in order to keep the internal representation of the -** schema consistent with what is on disk. -*/ -case OP_DropTrigger: { /* no-push */ - sqlite3UnlinkAndDeleteTrigger(db, pOp->p1, pOp->p3); - break; -} - - -#ifndef SQLITE_OMIT_INTEGRITY_CHECK -/* Opcode: IntegrityCk * P2 * -** -** Do an analysis of the currently open database. Push onto the -** stack the text of an error message describing any problems. -** If there are no errors, push a "ok" onto the stack. -** -** The root page numbers of all tables in the database are integer -** values on the stack. This opcode pulls as many integers as it -** can off of the stack and uses those numbers as the root pages. -** -** If P2 is not zero, the check is done on the auxiliary database -** file, not the main database file. -** -** This opcode is used for testing purposes only. -*/ -case OP_IntegrityCk: { - int nRoot; - int *aRoot; - int j; - char *z; - - for(nRoot=0; &pTos[-nRoot]>=p->aStack; nRoot++){ - if( (pTos[-nRoot].flags & MEM_Int)==0 ) break; - } - assert( nRoot>0 ); - aRoot = sqliteMallocRaw( sizeof(int*)*(nRoot+1) ); - if( aRoot==0 ) goto no_mem; - for(j=0; j<nRoot; j++){ - Mem *pMem = &pTos[-j]; - aRoot[j] = pMem->i; - } - aRoot[j] = 0; - popStack(&pTos, nRoot); - pTos++; - z = sqlite3BtreeIntegrityCheck(db->aDb[pOp->p2].pBt, aRoot, nRoot); - if( z==0 || z[0]==0 ){ - if( z ) sqliteFree(z); - pTos->z = "ok"; - pTos->n = 2; - pTos->flags = MEM_Str | MEM_Static | MEM_Term; - }else{ - pTos->z = z; - pTos->n = strlen(z); - pTos->flags = MEM_Str | MEM_Dyn | MEM_Term; - pTos->xDel = 0; - } - pTos->enc = SQLITE_UTF8; - sqlite3VdbeChangeEncoding(pTos, db->enc); - sqliteFree(aRoot); - break; -} -#endif /* SQLITE_OMIT_INTEGRITY_CHECK */ - -/* Opcode: ListWrite * * * -** -** Write the integer on the top of the stack -** into the temporary storage list. -*/ -case OP_ListWrite: { /* no-push */ - Keylist *pKeylist; - assert( pTos>=p->aStack ); - pKeylist = p->pList; - if( pKeylist==0 || pKeylist->nUsed>=pKeylist->nKey ){ - pKeylist = sqliteMallocRaw( sizeof(Keylist)+999*sizeof(pKeylist->aKey[0]) ); - if( pKeylist==0 ) goto no_mem; - pKeylist->nKey = 1000; - pKeylist->nRead = 0; - pKeylist->nUsed = 0; - pKeylist->pNext = p->pList; - p->pList = pKeylist; - } - Integerify(pTos); - pKeylist->aKey[pKeylist->nUsed++] = pTos->i; - assert( (pTos->flags & MEM_Dyn)==0 ); - pTos--; - break; -} - -/* Opcode: ListRewind * * * -** -** Rewind the temporary buffer back to the beginning. -*/ -case OP_ListRewind: { /* no-push */ - /* What this opcode codes, really, is reverse the order of the - ** linked list of Keylist structures so that they are read out - ** in the same order that they were read in. */ - Keylist *pRev, *pTop; - pRev = 0; - while( p->pList ){ - pTop = p->pList; - p->pList = pTop->pNext; - pTop->pNext = pRev; - pRev = pTop; - } - p->pList = pRev; - break; -} - -/* Opcode: ListRead * P2 * -** -** Attempt to read an integer from the temporary storage buffer -** and push it onto the stack. If the storage buffer is empty, -** push nothing but instead jump to P2. -*/ -case OP_ListRead: { - Keylist *pKeylist; - CHECK_FOR_INTERRUPT; - pKeylist = p->pList; - if( pKeylist!=0 ){ - assert( pKeylist->nRead>=0 ); - assert( pKeylist->nRead<pKeylist->nUsed ); - assert( pKeylist->nRead<pKeylist->nKey ); - pTos++; - pTos->i = pKeylist->aKey[pKeylist->nRead++]; - pTos->flags = MEM_Int; - if( pKeylist->nRead>=pKeylist->nUsed ){ - p->pList = pKeylist->pNext; - sqliteFree(pKeylist); - } - }else{ - pc = pOp->p2 - 1; - } - break; -} - -/* Opcode: ListReset * * * -** -** Reset the temporary storage buffer so that it holds nothing. -*/ -case OP_ListReset: { /* no-push */ - if( p->pList ){ - sqlite3VdbeKeylistFree(p->pList); - p->pList = 0; - } - break; -} - -#ifndef SQLITE_OMIT_SUBQUERY -/* Opcode: AggContextPush * * * -** -** Save the state of the current aggregator. It is restored an -** AggContextPop opcode. -** -*/ -case OP_AggContextPush: { /* no-push */ - p->pAgg++; - assert( p->pAgg<&p->apAgg[p->nAgg] ); - break; -} - -/* Opcode: AggContextPop * * * -** -** Restore the aggregator to the state it was in when AggContextPush -** was last called. Any data in the current aggregator is deleted. -*/ -case OP_AggContextPop: { /* no-push */ - p->pAgg--; - assert( p->pAgg>=p->apAgg ); - break; -} -#endif - -#ifndef SQLITE_OMIT_TRIGGER -/* Opcode: ContextPush * * * -** -** Save the current Vdbe context such that it can be restored by a ContextPop -** opcode. The context stores the last insert row id, the last statement change -** count, and the current statement change count. -*/ -case OP_ContextPush: { /* no-push */ - int i = p->contextStackTop++; - Context *pContext; - - assert( i>=0 ); - /* FIX ME: This should be allocated as part of the vdbe at compile-time */ - if( i>=p->contextStackDepth ){ - p->contextStackDepth = i+1; - p->contextStack = sqliteRealloc(p->contextStack, sizeof(Context)*(i+1)); - if( p->contextStack==0 ) goto no_mem; - } - pContext = &p->contextStack[i]; - pContext->lastRowid = db->lastRowid; - pContext->nChange = p->nChange; - pContext->pList = p->pList; - p->pList = 0; - break; -} - -/* Opcode: ContextPop * * * -** -** Restore the Vdbe context to the state it was in when contextPush was last -** executed. The context stores the last insert row id, the last statement -** change count, and the current statement change count. -*/ -case OP_ContextPop: { /* no-push */ - Context *pContext = &p->contextStack[--p->contextStackTop]; - assert( p->contextStackTop>=0 ); - db->lastRowid = pContext->lastRowid; - p->nChange = pContext->nChange; - sqlite3VdbeKeylistFree(p->pList); - p->pList = pContext->pList; - break; -} -#endif /* #ifndef SQLITE_OMIT_TRIGGER */ - -/* Opcode: SortInsert * * * -** -** The TOS is the key and the NOS is the data. Pop both from the stack -** and put them on the sorter. The key and data should have been -** made using the MakeRecord opcode. -*/ -case OP_SortInsert: { /* no-push */ - Mem *pNos = &pTos[-1]; - Sorter *pSorter; - assert( pNos>=p->aStack ); - if( Dynamicify(pTos, db->enc) ) goto no_mem; - pSorter = sqliteMallocRaw( sizeof(Sorter) ); - if( pSorter==0 ) goto no_mem; - pSorter->pNext = 0; - if( p->pSortTail ){ - p->pSortTail->pNext = pSorter; - }else{ - p->pSort = pSorter; - } - p->pSortTail = pSorter; - assert( pTos->flags & MEM_Dyn ); - pSorter->nKey = pTos->n; - pSorter->zKey = pTos->z; - pSorter->data.flags = MEM_Null; - rc = sqlite3VdbeMemMove(&pSorter->data, pNos); - pTos -= 2; - break; -} - -/* Opcode: Sort * * P3 -** -** Sort all elements on the sorter. The algorithm is a -** mergesort. The P3 argument is a pointer to a KeyInfo structure -** that describes the keys to be sorted. -*/ -case OP_Sort: { /* no-push */ - int i; - KeyInfo *pKeyInfo = (KeyInfo*)pOp->p3; - Sorter *pElem; - Sorter *apSorter[NSORT]; - sqlite3_sort_count++; - pKeyInfo->enc = p->db->enc; - for(i=0; i<NSORT; i++){ - apSorter[i] = 0; - } - while( p->pSort ){ - pElem = p->pSort; - p->pSort = pElem->pNext; - pElem->pNext = 0; - for(i=0; i<NSORT-1; i++){ - if( apSorter[i]==0 ){ - apSorter[i] = pElem; - break; - }else{ - pElem = Merge(apSorter[i], pElem, pKeyInfo); - apSorter[i] = 0; - } - } - if( i>=NSORT-1 ){ - apSorter[NSORT-1] = Merge(apSorter[NSORT-1],pElem, pKeyInfo); - } - } - pElem = 0; - for(i=0; i<NSORT; i++){ - pElem = Merge(apSorter[i], pElem, pKeyInfo); - } - p->pSort = pElem; - break; -} - -/* Opcode: SortNext * P2 * -** -** Push the data for the topmost element in the sorter onto the -** stack, then remove the element from the sorter. If the sorter -** is empty, push nothing on the stack and instead jump immediately -** to instruction P2. -*/ -case OP_SortNext: { - Sorter *pSorter = p->pSort; - CHECK_FOR_INTERRUPT; - if( pSorter!=0 ){ - p->pSort = pSorter->pNext; - pTos++; - pTos->flags = MEM_Null; - rc = sqlite3VdbeMemMove(pTos, &pSorter->data); - sqliteFree(pSorter->zKey); - sqliteFree(pSorter); - }else{ - pc = pOp->p2 - 1; - } - break; -} - -/* Opcode: SortReset * * * -** -** Remove any elements that remain on the sorter. -*/ -case OP_SortReset: { /* no-push */ - sqlite3VdbeSorterReset(p); - break; -} - -/* Opcode: MemStore P1 P2 * -** -** Write the top of the stack into memory location P1. -** P1 should be a small integer since space is allocated -** for all memory locations between 0 and P1 inclusive. -** -** After the data is stored in the memory location, the -** stack is popped once if P2 is 1. If P2 is zero, then -** the original data remains on the stack. -*/ -case OP_MemStore: { /* no-push */ - assert( pTos>=p->aStack ); - assert( pOp->p1>=0 && pOp->p1<p->nMem ); - rc = sqlite3VdbeMemMove(&p->aMem[pOp->p1], pTos); - pTos--; - - /* If P2 is 0 then fall thru to the next opcode, OP_MemLoad, that will - ** restore the top of the stack to its original value. - */ - if( pOp->p2 ){ - break; - } -} -/* Opcode: MemLoad P1 * * -** -** Push a copy of the value in memory location P1 onto the stack. -** -** If the value is a string, then the value pushed is a pointer to -** the string that is stored in the memory location. If the memory -** location is subsequently changed (using OP_MemStore) then the -** value pushed onto the stack will change too. -*/ -case OP_MemLoad: { - int i = pOp->p1; - assert( i>=0 && i<p->nMem ); - pTos++; - sqlite3VdbeMemShallowCopy(pTos, &p->aMem[i], MEM_Ephem); - break; -} - -#ifndef SQLITE_OMIT_AUTOINCREMENT -/* Opcode: MemMax P1 * * -** -** Set the value of memory cell P1 to the maximum of its current value -** and the value on the top of the stack. The stack is unchanged. -** -** This instruction throws an error if the memory cell is not initially -** an integer. -*/ -case OP_MemMax: { /* no-push */ - int i = pOp->p1; - Mem *pMem; - assert( pTos>=p->aStack ); - assert( i>=0 && i<p->nMem ); - pMem = &p->aMem[i]; - Integerify(pMem); - Integerify(pTos); - if( pMem->i<pTos->i){ - pMem->i = pTos->i; - } - break; -} -#endif /* SQLITE_OMIT_AUTOINCREMENT */ - -/* Opcode: MemIncr P1 P2 * -** -** Increment the integer valued memory cell P1 by 1. If P2 is not zero -** and the result after the increment is exactly 1, then jump -** to P2. -** -** This instruction throws an error if the memory cell is not initially -** an integer. -*/ -case OP_MemIncr: { /* no-push */ - int i = pOp->p1; - Mem *pMem; - assert( i>=0 && i<p->nMem ); - pMem = &p->aMem[i]; - assert( pMem->flags==MEM_Int ); - pMem->i++; - if( pOp->p2>0 && pMem->i==1 ){ - pc = pOp->p2 - 1; - } - break; -} - -/* Opcode: IfMemPos P1 P2 * -** -** If the value of memory cell P1 is 1 or greater, jump to P2. This -** opcode assumes that memory cell P1 holds an integer value. -*/ -case OP_IfMemPos: { /* no-push */ - int i = pOp->p1; - Mem *pMem; - assert( i>=0 && i<p->nMem ); - pMem = &p->aMem[i]; - assert( pMem->flags==MEM_Int ); - if( pMem->i>0 ){ - pc = pOp->p2 - 1; - } - break; -} - -/* Opcode: AggReset P1 P2 P3 -** -** Reset the current aggregator context so that it no longer contains any -** data. Future aggregator elements will contain P2 values each and be sorted -** using the KeyInfo structure pointed to by P3. -** -** If P1 is non-zero, then only a single aggregator row is available (i.e. -** there is no GROUP BY expression). In this case it is illegal to invoke -** OP_AggFocus. -*/ -case OP_AggReset: { /* no-push */ - assert( !pOp->p3 || pOp->p3type==P3_KEYINFO ); - if( pOp->p1 ){ - rc = sqlite3VdbeAggReset(0, p->pAgg, (KeyInfo *)pOp->p3); - p->pAgg->nMem = pOp->p2; /* Agg.nMem is used by AggInsert() */ - rc = AggInsert(p->pAgg, 0, 0); - }else{ - rc = sqlite3VdbeAggReset(db, p->pAgg, (KeyInfo *)pOp->p3); - p->pAgg->nMem = pOp->p2; - } - if( rc!=SQLITE_OK ){ - goto abort_due_to_error; - } - p->pAgg->apFunc = sqliteMalloc( p->pAgg->nMem*sizeof(p->pAgg->apFunc[0]) ); - if( p->pAgg->apFunc==0 ) goto no_mem; - break; -} - -/* Opcode: AggInit P1 P2 P3 -** -** Initialize the function parameters for an aggregate function. -** The aggregate will operate out of aggregate column P2. -** P3 is a pointer to the FuncDef structure for the function. -** -** The P1 argument is not used by this opcode. However if the SSE -** extension is compiled in, P1 is set to the number of arguments that -** will be passed to the aggregate function, if any. This is used -** by SSE to select the correct function when (de)serializing statements. -*/ -case OP_AggInit: { /* no-push */ - int i = pOp->p2; - assert( i>=0 && i<p->pAgg->nMem ); - p->pAgg->apFunc[i] = (FuncDef*)pOp->p3; - break; -} - -/* Opcode: AggFunc * P2 P3 -** -** Execute the step function for an aggregate. The -** function has P2 arguments. P3 is a pointer to the FuncDef -** structure that specifies the function. -** -** The top of the stack must be an integer which is the index of -** the aggregate column that corresponds to this aggregate function. -** Ideally, this index would be another parameter, but there are -** no free parameters left. The integer is popped from the stack. -*/ -case OP_AggFunc: { /* no-push */ - int n = pOp->p2; - int i; - Mem *pMem, *pRec; - sqlite3_context ctx; - sqlite3_value **apVal; - - assert( n>=0 ); - assert( pTos->flags==MEM_Int ); - pRec = &pTos[-n]; - assert( pRec>=p->aStack ); - - apVal = p->apArg; - assert( apVal || n==0 ); - - for(i=0; i<n; i++, pRec++){ - apVal[i] = pRec; - storeTypeInfo(pRec, db->enc); - } - i = pTos->i; - assert( i>=0 && i<p->pAgg->nMem ); - ctx.pFunc = (FuncDef*)pOp->p3; - pMem = &p->pAgg->pCurrent->aMem[i]; - ctx.s.z = pMem->zShort; /* Space used for small aggregate contexts */ - ctx.pAgg = pMem->z; - ctx.cnt = ++pMem->i; - ctx.isError = 0; - ctx.pColl = 0; - if( ctx.pFunc->needCollSeq ){ - assert( pOp>p->aOp ); - assert( pOp[-1].p3type==P3_COLLSEQ ); - assert( pOp[-1].opcode==OP_CollSeq ); - ctx.pColl = (CollSeq *)pOp[-1].p3; - } - (ctx.pFunc->xStep)(&ctx, n, apVal); - pMem->z = ctx.pAgg; - pMem->flags = MEM_AggCtx; - popStack(&pTos, n+1); - if( ctx.isError ){ - rc = SQLITE_ERROR; - } - break; -} - -/* Opcode: AggFocus * P2 * -** -** Pop the top of the stack and use that as an aggregator key. If -** an aggregator with that same key already exists, then make the -** aggregator the current aggregator and jump to P2. If no aggregator -** with the given key exists, create one and make it current but -** do not jump. -** -** The order of aggregator opcodes is important. The order is: -** AggReset AggFocus AggNext. In other words, you must execute -** AggReset first, then zero or more AggFocus operations, then -** zero or more AggNext operations. You must not execute an AggFocus -** in between an AggNext and an AggReset. -*/ -case OP_AggFocus: { /* no-push */ - char *zKey; - int nKey; - int res; - assert( pTos>=p->aStack ); - Stringify(pTos, db->enc); - zKey = pTos->z; - nKey = pTos->n; - assert( p->pAgg->pBtree ); - assert( p->pAgg->pCsr ); - rc = sqlite3BtreeMoveto(p->pAgg->pCsr, zKey, nKey, &res); - if( rc!=SQLITE_OK ){ - goto abort_due_to_error; - } - if( res==0 ){ - rc = sqlite3BtreeData(p->pAgg->pCsr, 0, sizeof(AggElem*), - (char *)&p->pAgg->pCurrent); - pc = pOp->p2 - 1; - }else{ - rc = AggInsert(p->pAgg, zKey, nKey); - } - if( rc!=SQLITE_OK ){ - goto abort_due_to_error; - } - Release(pTos); - pTos--; - break; -} - -/* Opcode: AggSet * P2 * -** -** Move the top of the stack into the P2-th field of the current -** aggregate. String values are duplicated into new memory. -*/ -case OP_AggSet: { /* no-push */ - AggElem *pFocus; - int i = pOp->p2; - pFocus = p->pAgg->pCurrent; - assert( pTos>=p->aStack ); - if( pFocus==0 ) goto no_mem; - assert( i>=0 && i<p->pAgg->nMem ); - rc = sqlite3VdbeMemMove(&pFocus->aMem[i], pTos); - pTos--; - break; -} - -/* Opcode: AggGet P1 P2 * -** -** Push a new entry onto the stack which is a copy of the P2-th field -** of the current aggregate. Strings are not duplicated so -** string values will be ephemeral. -** -** If P1 is zero, then the value is pulled out of the current aggregate -** in the current aggregate context. If P1 is greater than zero, then -** the value is taken from the P1th outer aggregate context. (i.e. if -** P1==1 then read from the aggregate context that will be restored -** by the next OP_AggContextPop opcode). -*/ -case OP_AggGet: { - AggElem *pFocus; - int i = pOp->p2; - Agg *pAgg = &p->pAgg[-pOp->p1]; - assert( pAgg>=p->apAgg ); - pFocus = pAgg->pCurrent; - if( pFocus==0 ){ - int res; - if( sqlite3_malloc_failed ) goto no_mem; - rc = sqlite3BtreeFirst(pAgg->pCsr, &res); - if( rc!=SQLITE_OK ){ - return rc; - } - if( res!=0 ){ - rc = AggInsert(pAgg, "", 1); - pFocus = pAgg->pCurrent; - }else{ - rc = sqlite3BtreeData(pAgg->pCsr, 0, 4, (char *)&pFocus); - } - } - assert( i>=0 && i<pAgg->nMem ); - pTos++; - sqlite3VdbeMemShallowCopy(pTos, &pFocus->aMem[i], MEM_Ephem); - if( pTos->flags&MEM_Str ){ - sqlite3VdbeChangeEncoding(pTos, db->enc); - } - break; -} - -/* Opcode: AggNext * P2 * -** -** Make the next aggregate value the current aggregate. The prior -** aggregate is deleted. If all aggregate values have been consumed, -** jump to P2. -** -** The order of aggregator opcodes is important. The order is: -** AggReset AggFocus AggNext. In other words, you must execute -** AggReset first, then zero or more AggFocus operations, then -** zero or more AggNext operations. You must not execute an AggFocus -** in between an AggNext and an AggReset. -*/ -case OP_AggNext: { /* no-push */ - int res; - assert( rc==SQLITE_OK ); - CHECK_FOR_INTERRUPT; - if( p->pAgg->searching==0 ){ - p->pAgg->searching = 1; - if( p->pAgg->pCsr ){ - rc = sqlite3BtreeFirst(p->pAgg->pCsr, &res); - }else{ - res = 0; - } - }else{ - if( p->pAgg->pCsr ){ - rc = sqlite3BtreeNext(p->pAgg->pCsr, &res); - }else{ - res = 1; - } - } - if( rc!=SQLITE_OK ) goto abort_due_to_error; - if( res!=0 ){ - pc = pOp->p2 - 1; - }else{ - int i; - sqlite3_context ctx; - Mem *aMem; - - if( p->pAgg->pCsr ){ - rc = sqlite3BtreeData(p->pAgg->pCsr, 0, sizeof(AggElem*), - (char *)&p->pAgg->pCurrent); - if( rc!=SQLITE_OK ) goto abort_due_to_error; - } - aMem = p->pAgg->pCurrent->aMem; - for(i=0; i<p->pAgg->nMem; i++){ - FuncDef *pFunc = p->pAgg->apFunc[i]; - Mem *pMem = &aMem[i]; - if( pFunc==0 || pFunc->xFinalize==0 ) continue; - ctx.s.flags = MEM_Null; - ctx.s.z = pMem->zShort; - ctx.pAgg = (void*)pMem->z; - ctx.cnt = pMem->i; - ctx.pFunc = pFunc; - pFunc->xFinalize(&ctx); - pMem->z = ctx.pAgg; - if( pMem->z && pMem->z!=pMem->zShort ){ - sqliteFree( pMem->z ); - } - *pMem = ctx.s; - if( pMem->flags & MEM_Short ){ - pMem->z = pMem->zShort; - } - } - } - break; -} - -/* Opcode: Vacuum * * * -** -** Vacuum the entire database. This opcode will cause other virtual -** machines to be created and run. It may not be called from within -** a transaction. -*/ -case OP_Vacuum: { /* no-push */ - if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse; - rc = sqlite3RunVacuum(&p->zErrMsg, db); - if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse; - break; -} - -/* Opcode: Expire P1 * * -** -** Cause precompiled statements to become expired. An expired statement -** fails with an error code of SQLITE_SCHEMA if it is ever executed -** (via sqlite3_step()). -** -** If P1 is 0, then all SQL statements become expired. If P1 is non-zero, -** then only the currently executing statement is affected. -*/ -case OP_Expire: { /* no-push */ - if( !pOp->p1 ){ - sqlite3ExpirePreparedStatements(db); - }else{ - p->expired = 1; - } - break; -} - - -/* An other opcode is illegal... -*/ -default: { - sqlite3_snprintf(sizeof(zBuf),zBuf,"%d",pOp->opcode); - sqlite3SetString(&p->zErrMsg, "unknown opcode ", zBuf, (char*)0); - rc = SQLITE_INTERNAL; - break; -} - -/***************************************************************************** -** The cases of the switch statement above this line should all be indented -** by 6 spaces. But the left-most 6 spaces have been removed to improve the -** readability. From this point on down, the normal indentation rules are -** restored. -*****************************************************************************/ - } - - /* Make sure the stack limit was not exceeded */ - assert( pTos<=pStackLimit ); - -#ifdef VDBE_PROFILE - { - long long elapse = hwtime() - start; - pOp->cycles += elapse; - pOp->cnt++; -#if 0 - fprintf(stdout, "%10lld ", elapse); - sqlite3VdbePrintOp(stdout, origPc, &p->aOp[origPc]); -#endif - } -#endif - - /* The following code adds nothing to the actual functionality - ** of the program. It is only here for testing and debugging. - ** On the other hand, it does burn CPU cycles every time through - ** the evaluator loop. So we can leave it out when NDEBUG is defined. - */ -#ifndef NDEBUG - /* Sanity checking on the top element of the stack */ - if( pTos>=p->aStack ){ - sqlite3VdbeMemSanity(pTos, db->enc); - } - if( pc<-1 || pc>=p->nOp ){ - sqlite3SetString(&p->zErrMsg, "jump destination out of range", (char*)0); - rc = SQLITE_INTERNAL; - } -#ifdef SQLITE_DEBUG - /* Code for tracing the vdbe stack. */ - if( p->trace && pTos>=p->aStack ){ - int i; - fprintf(p->trace, "Stack:"); - for(i=0; i>-5 && &pTos[i]>=p->aStack; i--){ - if( pTos[i].flags & MEM_Null ){ - fprintf(p->trace, " NULL"); - }else if( (pTos[i].flags & (MEM_Int|MEM_Str))==(MEM_Int|MEM_Str) ){ - fprintf(p->trace, " si:%lld", pTos[i].i); - }else if( pTos[i].flags & MEM_Int ){ - fprintf(p->trace, " i:%lld", pTos[i].i); - }else if( pTos[i].flags & MEM_Real ){ - fprintf(p->trace, " r:%g", pTos[i].r); - }else{ - char zBuf[100]; - sqlite3VdbeMemPrettyPrint(&pTos[i], zBuf, 100); - fprintf(p->trace, " "); - fprintf(p->trace, "%s", zBuf); - } - } - if( rc!=0 ) fprintf(p->trace," rc=%d",rc); - fprintf(p->trace,"\n"); - } -#endif /* SQLITE_DEBUG */ -#endif /* NDEBUG */ - } /* The end of the for(;;) loop the loops through opcodes */ - - /* If we reach this point, it means that execution is finished. - */ -vdbe_halt: - if( rc ){ - p->rc = rc; - rc = SQLITE_ERROR; - }else{ - rc = SQLITE_DONE; - } - sqlite3VdbeHalt(p); - p->pTos = pTos; - return rc; - - /* Jump to here if a malloc() fails. It's hard to get a malloc() - ** to fail on a modern VM computer, so this code is untested. - */ -no_mem: - sqlite3SetString(&p->zErrMsg, "out of memory", (char*)0); - rc = SQLITE_NOMEM; - goto vdbe_halt; - - /* Jump to here for an SQLITE_MISUSE error. - */ -abort_due_to_misuse: - rc = SQLITE_MISUSE; - /* Fall thru into abort_due_to_error */ - - /* Jump to here for any other kind of fatal error. The "rc" variable - ** should hold the error number. - */ -abort_due_to_error: - if( p->zErrMsg==0 ){ - if( sqlite3_malloc_failed ) rc = SQLITE_NOMEM; - sqlite3SetString(&p->zErrMsg, sqlite3ErrStr(rc), (char*)0); - } - goto vdbe_halt; - - /* Jump to here if the sqlite3_interrupt() API sets the interrupt - ** flag. - */ -abort_due_to_interrupt: - assert( db->flags & SQLITE_Interrupt ); - db->flags &= ~SQLITE_Interrupt; - if( db->magic!=SQLITE_MAGIC_BUSY ){ - rc = SQLITE_MISUSE; - }else{ - rc = SQLITE_INTERRUPT; - } - p->rc = rc; - sqlite3SetString(&p->zErrMsg, sqlite3ErrStr(rc), (char*)0); - goto vdbe_halt; -} |