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-rw-r--r--kopete/plugins/statistics/sqlite/vdbe.c4450
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diff --git a/kopete/plugins/statistics/sqlite/vdbe.c b/kopete/plugins/statistics/sqlite/vdbe.c
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--- a/kopete/plugins/statistics/sqlite/vdbe.c
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-/*
-** 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;
-
-/*
-** 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;
- }
- }
- }
- }
-}
-
-#ifndef NDEBUG
-/*
-** 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 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
-
- 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] );
-#ifdef VDBE_PROFILE
- origPc = pc;
- start = hwtime();
-#endif
- pOp = &p->aOp[pc];
-
- /* Only allow tracing if NDEBUG is not defined.
- */
-#ifndef NDEBUG
- if( p->trace ){
- if( pc==0 ){
- printf("VDBE Execution Trace:\n");
- sqlite3VdbePrintSql(p);
- }
- sqlite3VdbePrintOp(p->trace, pc, pOp);
- }
-#endif
-#ifdef SQLITE_TEST
- 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
-
- 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.
-**
-** 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: {
- 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: {
- 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: {
- 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: {
- 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);
- if( rc==SQLITE_BUSY ){
- p->rc = SQLITE_BUSY;
- return SQLITE_BUSY;
- }else if( rc!=SQLITE_OK ){
- p->rc = rc;
- }
- 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.
-*/
-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 */
- pOp->opcode = OP_String;
-
- if( db->enc!=SQLITE_UTF8 && pOp->p3 ){
- 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;
- }
- /* 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++;
- if( pOp->p3 ){
- pTos->flags = MEM_Str|MEM_Static|MEM_Term;
- pTos->z = pOp->p3;
- if( db->enc==SQLITE_UTF8 ){
- pTos->n = strlen(pTos->z);
- }else{
- pTos->n = sqlite3utf16ByteLen(pTos->z, -1);
- }
- pTos->enc = db->enc;
- }else{
- pTos->flags = MEM_Null;
- }
- break;
-}
-
-/* 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
-** before execution (within the sqlite3_prepare() function).
-*/
-case OP_Blob: {
- pTos++;
- sqlite3VdbeMemSetStr(pTos, pOp->p3, pOp->p1, 0, 0);
- break;
-}
-
-/* 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: {
- 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: {
- 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: {
- 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: {
- 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 */
-case OP_Subtract: /* same as TK_MINUS */
-case OP_Multiply: /* same as TK_STAR */
-case OP_Divide: /* same as TK_SLASH */
-case OP_Remainder: { /* same as TK_REM */
- 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()
-** built-in 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: {
- 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;
- ctx.isStep = 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 */
-case OP_BitOr: /* same as TK_BITOR */
-case OP_ShiftLeft: /* same as TK_LSHIFT */
-case OP_ShiftRight: { /* same as TK_RSHIFT */
- 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: {
- 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: {
- int 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: {
- 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.
-**
-** The least significant byte of P1 may be either 0x00 or 0x01. If either
-** operand is NULL (and thus if the result is unknown) then take the jump
-** only if the least significant byte of P1 is 0x01.
-**
-** The second least significant byte of P1 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 */
-case OP_Ne: /* same as TK_NE */
-case OP_Lt: /* same as TK_LT */
-case OP_Le: /* same as TK_LE */
-case OP_Gt: /* same as TK_GT */
-case OP_Ge: { /* same as TK_GE */
- 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&0xFF) ) pc = pOp->p2-1;
- }else{
- pTos++;
- pTos->flags = MEM_Null;
- }
- break;
- }
-
- affinity = (pOp->p1>>8)&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 */
-case OP_Or: { /* same as TK_OR */
- 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 */
-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 */
- 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 */
- 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: {
- 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:
-case OP_IfNot: {
- int c;
- assert( pTos>=p->aStack );
- if( pTos->flags & MEM_Null ){
- c = pOp->p1;
- }else{
- c = sqlite3VdbeIntValue(pTos);
- 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 */
- 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 */
- 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.
-*/
-case OP_SetNumColumns: {
- assert( (pOp->p1)<p->nCursor );
- assert( p->apCsr[pOp->p1]!=0 );
- p->apCsr[pOp->p1]->nField = pOp->p2;
- break;
-}
-
-/* Opcode: IdxColumn P1 * *
-**
-** P1 is a cursor opened on an index. Push the first field from the
-** current index key onto the stack.
-*/
-/* Opcode: Column P1 P2 *
-**
-** 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 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_IdxColumn:
-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 */
- sqlite3VdbeCursorMoveto(pC);
- zRec = 0;
- pCrsr = pC->pCursor;
- if( pC->nullRow ){
- payloadSize = 0;
- }else if( pC->cacheValid ){
- payloadSize = pC->payloadSize;
- zRec = pC->aRow;
- }else if( pC->keyAsData ){
- i64 payloadSize64;
- sqlite3BtreeKeySize(pCrsr, &payloadSize64);
- payloadSize = payloadSize64;
- }else{
- sqlite3BtreeDataSize(pCrsr, &payloadSize);
- }
- nField = pC->nField;
- }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;
- }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->keyAsData ){
- 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->keyAsData, &sMem);
- if( rc!=SQLITE_OK ){
- goto abort_due_to_error;
- }
- 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;
- 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;
-
- /* 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 ){
- sqliteFree(aType);
- if( pC ) pC->aType = 0;
- rc = SQLITE_CORRUPT;
- break;
- }
-
- /* 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( rc!=SQLITE_OK ){
- goto abort_due_to_error;
- }
- if( zRec ){
- zData = &zRec[aOffset[p2]];
- }else{
- len = sqlite3VdbeSerialTypeLen(aType[p2]);
- sqlite3VdbeMemFromBtree(pCrsr, aOffset[p2], len, pC->keyAsData, &sMem);
- zData = sMem.z;
- }
- sqlite3VdbeSerialGet(zData, aType[p2], pTos);
- pTos->enc = db->enc;
-
- /* 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);
-
- /* Release the aType[] memory if we are not dealing with cursor */
- if( !pC ){
- 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).
-**
-** Character Column affinity
-** ------------------------------
-** '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 */
- 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 += sqlite3VarintLen(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);
- }
-
- /* If zCsr has not been advanced exactly nByte bytes, then one
- ** of the sqlite3PutVarint() or sqlite3VdbeSerialPut() calls above
- ** failed. This indicates a corrupted memory cell or code bug.
- */
- if( zCsr!=(zNewRecord+nByte) ){
- rc = SQLITE_INTERNAL;
- goto abort_due_to_error;
- }
-
- /* 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: {
- 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: {
- 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: {
- 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: {
- 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: {
- 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:
-case OP_OpenWrite: {
- 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);
- pCur->pKeyInfo = (KeyInfo*)pOp->p3;
- if( pCur->pKeyInfo ){
- pCur->pIncrKey = &pCur->pKeyInfo->incrKey;
- pCur->pKeyInfo->enc = p->db->enc;
- }else{
- 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);
- pCur->intKey = (flags & BTREE_INTKEY)!=0;
- pCur->zeroData = (flags & BTREE_ZERODATA)!=0;
- break;
- }
- case SQLITE_EMPTY: {
- 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: {
- 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;
- }
- }else{
- rc = sqlite3BtreeCursor(pCx->pBt, MASTER_ROOT, 1, 0, 0, &pCx->pCursor);
- pCx->intKey = 1;
- pCx->pIncrKey = &pCx->bogusIncrKey;
- }
- }
- break;
-}
-
-/* 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: {
- 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;
- break;
-}
-
-/* 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: {
- 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:
-case OP_MoveLe:
-case OP_MoveGe:
-case OP_MoveGt: {
- 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->intKey ){
- i64 iKey;
- assert( !pOp->p3 );
- 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;
- }
- sqlite3BtreeMoveto(pC->pCursor, 0, (u64)iKey, &res);
- pC->lastRecno = pTos->i;
- pC->recnoIsValid = res==0;
- }else{
- Stringify(pTos, db->enc);
- sqlite3BtreeMoveto(pC->pCursor, pTos->z, pTos->n, &res);
- pC->recnoIsValid = 0;
- }
- pC->deferredMoveto = 0;
- pC->cacheValid = 0;
- *pC->pIncrKey = 0;
- sqlite3_search_count++;
- if( oc==OP_MoveGe || oc==OP_MoveGt ){
- if( res<0 ){
- sqlite3BtreeNext(pC->pCursor, &res);
- pC->recnoIsValid = 0;
- }else{
- res = 0;
- }
- }else{
- assert( oc==OP_MoveLt || oc==OP_MoveLe );
- if( res>=0 ){
- sqlite3BtreePrevious(pC->pCursor, &res);
- pC->recnoIsValid = 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 string key. If a record with that key does
-** not exist in the table of cursor P1, then jump to P2. If the record
-** does already exist, then fall thru. The cursor is left pointing
-** at the record if it exists. The key is not popped from the stack.
-**
-** This operation is similar to NotFound except that this operation
-** does not pop the key from the stack.
-**
-** See also: Found, NotFound, MoveTo, IsUnique, NotExists
-*/
-/* Opcode: Found P1 P2 *
-**
-** Use the top of the stack as a string key. If a record with that key
-** does exist in table of P1, then jump to P2. If the record
-** does not exist, then fall thru. The cursor is left pointing
-** to the record if it exists. The key is popped from the stack.
-**
-** See also: Distinct, NotFound, MoveTo, IsUnique, NotExists
-*/
-/* Opcode: NotFound P1 P2 *
-**
-** Use the top of the stack as a string 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 key 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:
-case OP_NotFound:
-case OP_Found: {
- 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->intKey==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_MakeIdxKey. This key contains one or more
-** fields followed by a ROWID field.
-**
-** 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: {
- 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 NotFound assumes it
-** is a string.
-**
-** See also: Distinct, Found, MoveTo, NotFound, IsUnique
-*/
-case OP_NotExists: {
- 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, rx;
- u64 iKey;
- assert( pTos->flags & MEM_Int );
- assert( p->apCsr[i]->intKey );
- iKey = intToKey(pTos->i);
- rx = sqlite3BtreeMoveto(pCrsr, 0, iKey, &res);
- pC->lastRecno = pTos->i;
- pC->recnoIsValid = res==0;
- pC->nullRow = 0;
- pC->cacheValid = 0;
- if( rx!=SQLITE_OK || res!=0 ){
- pc = pOp->p2 - 1;
- pC->recnoIsValid = 0;
- }
- }
- Release(pTos);
- pTos--;
- break;
-}
-
-/* Opcode: NewRecno P1 * *
-**
-** Get a new integer record number 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.
-*/
-case OP_NewRecno: {
- 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;
- assert( (sqlite3BtreeFlags(pC->pCursor) & BTREE_INTKEY)!=0 );
- assert( (sqlite3BtreeFlags(pC->pCursor) & BTREE_ZERODATA)==0 );
- 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==0x7fffffffffffffff ){
- pC->useRandomRowid = 1;
- }else{
- v++;
- }
- }
- }
- if( v<0x7fffffffffffffff ){
- pC->nextRowidValid = 1;
- pC->nextRowid = v+1;
- }else{
- pC->nextRowidValid = 0;
- }
- }
- if( pC->useRandomRowid ){
- 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->recnoIsValid = 0;
- pC->deferredMoveto = 0;
- pC->cacheValid = 0;
- }
- pTos++;
- pTos->i = v;
- pTos->flags = MEM_Int;
- break;
-}
-
-/* Opcode: PutIntKey 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).
-*/
-/* Opcode: PutStrKey P1 * *
-**
-** 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 a string. The stack is popped twice by this instruction.
-**
-** P1 may not be a pseudo-table opened using the OpenPseudo opcode.
-*/
-case OP_PutIntKey:
-case OP_PutStrKey: {
- 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) ){
- char *zKey;
- i64 nKey;
- i64 iKey;
- if( pOp->opcode==OP_PutStrKey ){
- Stringify(pNos, db->enc);
- nKey = pNos->n;
- zKey = pNos->z;
- }else{
- assert( pNos->flags & MEM_Int );
-
- /* If the table is an INTKEY table, set nKey to the value of
- ** the integer key, and zKey to NULL. Otherwise, set nKey to
- ** sizeof(i64) and point zKey at iKey. iKey contains the integer
- ** key in the on-disk byte order.
- */
- iKey = intToKey(pNos->i);
- if( pC->intKey ){
- nKey = intToKey(pNos->i);
- zKey = 0;
- }else{
- nKey = sizeof(i64);
- zKey = (char*)&iKey;
- }
-
- 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) );
- }
- if( pC->pseudoTable ){
- /* PutStrKey does not work for pseudo-tables.
- ** The following assert makes sure we are not trying to use
- ** PutStrKey on a pseudo-table
- */
- assert( pOp->opcode==OP_PutIntKey );
- 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{
- rc = sqlite3BtreeInsert(pC->pCursor, zKey, nKey, pTos->z, pTos->n);
- }
- pC->recnoIsValid = 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: {
- int i = pOp->p1;
- Cursor *pC;
- assert( i>=0 && i<p->nCursor );
- pC = p->apCsr[i];
- assert( pC!=0 );
- if( pC->pCursor!=0 ){
- sqlite3VdbeCursorMoveto(pC);
- 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: {
- if( pOp->p1 ){
- sqlite3VdbeSetChanges(db, p->nChange);
- }
- p->nChange = 0;
- break;
-}
-
-/* Opcode: KeyAsData P1 P2 *
-**
-** Turn the key-as-data mode for cursor P1 either on (if P2==1) or
-** off (if P2==0). In key-as-data mode, the OP_Column opcode pulls
-** data off of the key rather than the data. This is used for
-** processing compound selects.
-*/
-case OP_KeyAsData: {
- int i = pOp->p1;
- Cursor *pC;
- assert( i>=0 && i<p->nCursor );
- pC = p->apCsr[i];
- assert( pC!=0 );
- pC->keyAsData = pOp->p2;
- 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;
-
- pTos++;
- assert( i>=0 && i<p->nCursor );
- pC = p->apCsr[i];
- assert( pC!=0 );
- if( pC->nullRow ){
- pTos->flags = MEM_Null;
- }else if( pC->pCursor!=0 ){
- BtCursor *pCrsr = pC->pCursor;
- sqlite3VdbeCursorMoveto(pC);
- if( pC->nullRow ){
- pTos->flags = MEM_Null;
- break;
- }else if( pC->keyAsData || pOp->opcode==OP_RowKey ){
- i64 n64;
- assert( !pC->intKey );
- 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->keyAsData || pOp->opcode==OP_RowKey ){
- sqlite3BtreeKey(pCrsr, 0, n, pTos->z);
- }else{
- sqlite3BtreeData(pCrsr, 0, n, pTos->z);
- }
- }else if( pC->pseudoTable ){
- pTos->n = pC->nData;
- pTos->z = pC->pData;
- pTos->flags = MEM_Blob|MEM_Ephem;
- }else{
- pTos->flags = MEM_Null;
- }
- break;
-}
-
-/* Opcode: Recno P1 * *
-**
-** Push onto the stack an integer which is the first 4 bytes of the
-** the key to the current entry in a sequential scan of the database
-** file P1. The sequential scan should have been started using the
-** Next opcode.
-*/
-case OP_Recno: {
- int i = pOp->p1;
- Cursor *pC;
- i64 v;
-
- assert( i>=0 && i<p->nCursor );
- pC = p->apCsr[i];
- assert( pC!=0 );
- sqlite3VdbeCursorMoveto(pC);
- pTos++;
- if( pC->recnoIsValid ){
- v = pC->lastRecno;
- }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: FullKey P1 * *
-**
-** Extract the complete key from the record that cursor P1 is currently
-** pointing to and push the key onto the stack as a string.
-**
-** Compare this opcode to Recno. The Recno opcode extracts the first
-** 4 bytes of the key and pushes those bytes onto the stack as an
-** integer. This instruction pushes the entire key as a string.
-**
-** This opcode may not be used on a pseudo-table.
-*/
-case OP_FullKey: {
- int i = pOp->p1;
- BtCursor *pCrsr;
- Cursor *pC;
-
- assert( i>=0 && i<p->nCursor );
- assert( p->apCsr[i]!=0 );
- assert( p->apCsr[i]->keyAsData );
- assert( !p->apCsr[i]->pseudoTable );
- pTos++;
- pTos->flags = MEM_Null;
- if( (pCrsr = (pC = p->apCsr[i])->pCursor)!=0 ){
- i64 amt;
- char *z;
-
- sqlite3VdbeCursorMoveto(pC);
- assert( pC->intKey==0 );
- sqlite3BtreeKeySize(pCrsr, &amt);
- if( amt<=0 ){
- rc = SQLITE_CORRUPT;
- goto abort_due_to_error;
- }
- if( amt>NBFS ){
- z = sqliteMallocRaw( amt );
- if( z==0 ) goto no_mem;
- pTos->flags = MEM_Blob | MEM_Dyn;
- pTos->xDel = 0;
- }else{
- z = pTos->zShort;
- pTos->flags = MEM_Blob | MEM_Short;
- }
- sqlite3BtreeKey(pCrsr, 0, amt, z);
- pTos->z = z;
- pTos->n = amt;
- }
- 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: {
- int i = pOp->p1;
- Cursor *pC;
-
- assert( i>=0 && i<p->nCursor );
- pC = p->apCsr[i];
- assert( pC!=0 );
- pC->nullRow = 1;
- pC->recnoIsValid = 0;
- break;
-}
-
-/* Opcode: Last P1 P2 *
-**
-** The next use of the Recno 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: {
- 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 Recno 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: {
- 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:
-case OP_Next: {
- 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->recnoIsValid = 0;
- break;
-}
-
-/* Opcode: IdxPut 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.
-*/
-case OP_IdxPut: {
- 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->intKey==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: {
- 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: IdxRecno P1 * *
-**
-** Push onto the stack an integer which is the varint located at the
-** end of the index key pointed to by cursor P1. These integer should be
-** the record number of the table entry to which this index entry points.
-**
-** See also: Recno, MakeIdxKey.
-*/
-case OP_IdxRecno: {
- 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->intKey==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:
-case OP_IdxGT:
-case OP_IdxGE: {
- 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: {
- 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.
-**
-** See also: Clear
-*/
-case OP_Destroy: {
- rc = sqlite3BtreeDropTable(db->aDb[pOp->p2].pBt, pOp->p1);
- 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: {
- 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: {
- 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 = iDb==1 ? TEMP_MASTER_NAME : MASTER_NAME;
- 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: {
- 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: {
- 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: {
- sqlite3UnlinkAndDeleteTrigger(db, pOp->p1, pOp->p3);
- break;
-}
-
-
-/* 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;
-}
-
-/* Opcode: ListWrite * * *
-**
-** Write the integer on the top of the stack
-** into the temporary storage list.
-*/
-case OP_ListWrite: {
- 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: {
- /* 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: {
- if( p->pList ){
- sqlite3VdbeKeylistFree(p->pList);
- p->pList = 0;
- }
- break;
-}
-
-/* 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: {
- 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: {
- 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;
-}
-
-/* Opcode: SortPut * * *
-**
-** 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 SortMakeKey and SortMakeRec, respectively.
-*/
-case OP_SortPut: {
- 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 = p->pSort;
- p->pSort = 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: {
- int i;
- KeyInfo *pKeyInfo = (KeyInfo*)pOp->p3;
- Sorter *pElem;
- Sorter *apSorter[NSORT];
- 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: {
- 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: {
- 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;
-}
-
-/* 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 greater than zero, then jump
-** to P2.
-**
-** This instruction throws an error if the memory cell is not initially
-** an integer.
-*/
-case OP_MemIncr: {
- 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>0 ){
- pc = pOp->p2 - 1;
- }
- break;
-}
-
-/* Opcode: AggReset P1 P2 P3
-**
-** Reset the aggregator 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: {
- assert( !pOp->p3 || pOp->p3type==P3_KEYINFO );
- if( pOp->p1 ){
- rc = sqlite3VdbeAggReset(0, &p->agg, (KeyInfo *)pOp->p3);
- p->agg.nMem = pOp->p2; /* Agg.nMem is used by AggInsert() */
- rc = AggInsert(&p->agg, 0, 0);
- }else{
- rc = sqlite3VdbeAggReset(db, &p->agg, (KeyInfo *)pOp->p3);
- p->agg.nMem = pOp->p2;
- }
- if( rc!=SQLITE_OK ){
- goto abort_due_to_error;
- }
- p->agg.apFunc = sqliteMalloc( p->agg.nMem*sizeof(p->agg.apFunc[0]) );
- if( p->agg.apFunc==0 ) goto no_mem;
- break;
-}
-
-/* Opcode: AggInit * 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.
-*/
-case OP_AggInit: {
- int i = pOp->p2;
- assert( i>=0 && i<p->agg.nMem );
- p->agg.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: {
- 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->agg.nMem );
- ctx.pFunc = (FuncDef*)pOp->p3;
- pMem = &p->agg.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.isStep = 1;
- 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: {
- char *zKey;
- int nKey;
- int res;
- assert( pTos>=p->aStack );
- Stringify(pTos, db->enc);
- zKey = pTos->z;
- nKey = pTos->n;
- assert( p->agg.pBtree );
- assert( p->agg.pCsr );
- rc = sqlite3BtreeMoveto(p->agg.pCsr, zKey, nKey, &res);
- if( rc!=SQLITE_OK ){
- goto abort_due_to_error;
- }
- if( res==0 ){
- rc = sqlite3BtreeData(p->agg.pCsr, 0, sizeof(AggElem*),
- (char *)&p->agg.pCurrent);
- pc = pOp->p2 - 1;
- }else{
- rc = AggInsert(&p->agg, 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: {
- AggElem *pFocus;
- int i = pOp->p2;
- pFocus = p->agg.pCurrent;
- assert( pTos>=p->aStack );
- if( pFocus==0 ) goto no_mem;
- assert( i>=0 && i<p->agg.nMem );
- rc = sqlite3VdbeMemMove(&pFocus->aMem[i], pTos);
- pTos--;
- break;
-}
-
-/* Opcode: AggGet * 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.
-*/
-case OP_AggGet: {
- AggElem *pFocus;
- int i = pOp->p2;
- pFocus = p->agg.pCurrent;
- if( pFocus==0 ) goto no_mem;
- assert( i>=0 && i<p->agg.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: {
- int res;
- assert( rc==SQLITE_OK );
- CHECK_FOR_INTERRUPT;
- if( p->agg.searching==0 ){
- p->agg.searching = 1;
- if( p->agg.pCsr ){
- rc = sqlite3BtreeFirst(p->agg.pCsr, &res);
- }else{
- res = 0;
- }
- }else{
- if( p->agg.pCsr ){
- rc = sqlite3BtreeNext(p->agg.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->agg.pCsr ){
- rc = sqlite3BtreeData(p->agg.pCsr, 0, sizeof(AggElem*),
- (char *)&p->agg.pCurrent);
- if( rc!=SQLITE_OK ) goto abort_due_to_error;
- }
- aMem = p->agg.pCurrent->aMem;
- for(i=0; i<p->agg.nMem; i++){
- FuncDef *pFunc = p->agg.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.isStep = 0;
- 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: {
- if( sqlite3SafetyOff(db) ) goto abort_due_to_misuse;
- rc = sqlite3RunVacuum(&p->zErrMsg, db);
- if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse;
- 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.
-*****************************************************************************/
- }
-
-#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;
- }
- 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
- } /* 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;
-}