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vdbe.c
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vdbe.c
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/*
* Copyright 2010-2017, Tarantool AUTHORS, please see AUTHORS file.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* The code in this file implements the function that runs the
* bytecode of a prepared statement.
*
* 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.
*/
#include "box/box.h"
#include "box/fkey.h"
#include "box/txn.h"
#include "box/session.h"
#include "sqliteInt.h"
#include "vdbeInt.h"
#include "tarantoolInt.h"
#include "msgpuck/msgpuck.h"
#include "box/schema.h"
#include "box/space.h"
#include "box/sequence.h"
/*
* Invoke this macro on memory cells just prior to changing the
* value of the cell. This macro verifies that shallow copies are
* not misused. A shallow copy of a string or blob just copies a
* pointer to the string or blob, not the content. If the original
* is changed while the copy is still in use, the string or blob might
* be changed out from under the copy. This macro verifies that nothing
* like that ever happens.
*/
#ifdef SQLITE_DEBUG
# define memAboutToChange(P,M) sqlite3VdbeMemAboutToChange(P,M)
#else
# define memAboutToChange(P,M)
#endif
/*
* The following global variable is incremented every time a cursor
* moves, either by the OP_SeekXX, 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.
*/
#ifdef SQLITE_TEST
int sql_search_count = 0;
#endif
#ifdef SQLITE_TEST
/*
* The following global variable is incremented in OP_RowData
* whenever the xfer optimization is used. This is used on
* testing purposes only - to make sure the transfer optimization
* really is happening when it is supposed to.
*/
int sql_xfer_count = 0;
#endif
/*
* When this global variable is positive, it gets decremented once before
* each instruction in the VDBE. When it reaches zero, the u1.isInterrupted
* field of the sqlite3 structure is set in order to simulate an interrupt.
*
* This facility is used for testing purposes only. It does not function
* in an ordinary build.
*/
#ifdef SQLITE_TEST
int sqlite3_interrupt_count = 0;
#endif
/*
* The next global variable is incremented each type the OP_Sort opcode
* is executed. The test procedures use this information to make sure that
* sorting is occurring or not occurring at appropriate times. This variable
* has no function other than to help verify the correct operation of the
* library.
*/
#ifdef SQLITE_TEST
int sql_sort_count = 0;
#endif
/*
* The next global variable records the size of the largest MEM_Blob
* or MEM_Str that has been used by a VDBE opcode. The test procedures
* use this information to make sure that the zero-blob functionality
* is working correctly. This variable has no function other than to
* help verify the correct operation of the library.
*/
#ifdef SQLITE_TEST
int sqlite3_max_blobsize = 0;
static void
updateMaxBlobsize(Mem *p)
{
if ((p->flags & (MEM_Str|MEM_Blob))!=0 && p->n>sqlite3_max_blobsize) {
sqlite3_max_blobsize = p->n;
}
}
#endif
/*
* The next global variable is incremented each time the OP_Found opcode
* is executed. This is used to test whether or not the foreign key
* operation implemented using OP_FkIsZero is working. This variable
* has no function other than to help verify the correct operation of the
* library.
*/
#ifdef SQLITE_TEST
int sql_found_count = 0;
#endif
/*
* Test a register to see if it exceeds the current maximum blob size.
* If it does, record the new maximum blob size.
*/
#if defined(SQLITE_TEST) && !defined(SQLITE_UNTESTABLE)
# define UPDATE_MAX_BLOBSIZE(P) updateMaxBlobsize(P)
#else
# define UPDATE_MAX_BLOBSIZE(P)
#endif
/*
* Invoke the VDBE coverage callback, if that callback is defined. This
* feature is used for test suite validation only and does not appear an
* production builds.
*
* M is an integer, 2 or 3, that indices how many different ways the
* branch can go. It is usually 2. "I" is the direction the branch
* goes. 0 means falls through. 1 means branch is taken. 2 means the
* second alternative branch is taken.
*
* iSrcLine is the source code line (from the __LINE__ macro) that
* generated the VDBE instruction. This instrumentation assumes that all
* source code is in a single file (the amalgamation). Special values 1
* and 2 for the iSrcLine parameter mean that this particular branch is
* always taken or never taken, respectively.
*/
#if !defined(SQLITE_VDBE_COVERAGE)
# define VdbeBranchTaken(I,M)
#else
# define VdbeBranchTaken(I,M) vdbeTakeBranch(pOp->iSrcLine,I,M)
static void
vdbeTakeBranch(int iSrcLine, u8 I, u8 M)
{
if (iSrcLine<=2 && ALWAYS(iSrcLine>0)) {
M = iSrcLine;
/* Assert the truth of VdbeCoverageAlwaysTaken() and
* VdbeCoverageNeverTaken()
*/
assert((M & I)==I);
} else {
if (sqlite3GlobalConfig.xVdbeBranch==0) return; /*NO_TEST*/
sqlite3GlobalConfig.xVdbeBranch(sqlite3GlobalConfig.pVdbeBranchArg,
iSrcLine,I,M);
}
}
#endif
/*
* Convert the given register into a string if it isn't one
* already. Return non-zero if a malloc() fails.
*/
#define Stringify(P) \
if(((P)->flags&(MEM_Str|MEM_Blob))==0 && sqlite3VdbeMemStringify(P,0)) \
{ goto no_mem; }
/*
* 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 register
* does not control the string, it might be deleted without the register
* knowing it.
*
* This routine converts an ephemeral string into a dynamically allocated
* string that the register itself controls. In other words, it
* converts an MEM_Ephem string into a string with P.z==P.zMalloc.
*/
#define Deephemeralize(P) \
if (((P)->flags&MEM_Ephem)!=0 \
&& sqlite3VdbeMemMakeWriteable(P)) { goto no_mem;}
/* Return true if the cursor was opened using the OP_OpenSorter opcode. */
#define isSorter(x) ((x)->eCurType==CURTYPE_SORTER)
/*
* Allocate VdbeCursor number iCur. Return a pointer to it. Return NULL
* if we run out of memory.
*/
static VdbeCursor *
allocateCursor(
Vdbe *p, /* The virtual machine */
int iCur, /* Index of the new VdbeCursor */
int nField, /* Number of fields in the table or index */
u8 eCurType /* Type of the new cursor */
)
{
/* Find the memory cell that will be used to store the blob of memory
* required for this VdbeCursor structure. It is convenient to use a
* vdbe memory cell to manage the memory allocation required for a
* VdbeCursor structure for the following reasons:
*
* * Sometimes cursor numbers are used for a couple of different
* purposes in a vdbe program. The different uses might require
* different sized allocations. Memory cells provide growable
* allocations.
*
* * When using ENABLE_MEMORY_MANAGEMENT, memory cell buffers can
* be freed lazily via the sqlite3_release_memory() API. This
* minimizes the number of malloc calls made by the system.
*
* The memory cell for cursor 0 is aMem[0]. The rest are allocated from
* the top of the register space. Cursor 1 is at Mem[p->nMem-1].
* Cursor 2 is at Mem[p->nMem-2]. And so forth.
*/
Mem *pMem = iCur>0 ? &p->aMem[p->nMem-iCur] : p->aMem;
int nByte;
VdbeCursor *pCx = 0;
nByte =
ROUND8(sizeof(VdbeCursor)) + sizeof(u32)*nField +
(eCurType==CURTYPE_TARANTOOL ? ROUND8(sizeof(BtCursor)) : 0);
assert(iCur>=0 && iCur<p->nCursor);
if (p->apCsr[iCur]) { /*OPTIMIZATION-IF-FALSE*/
sqlite3VdbeFreeCursor(p, p->apCsr[iCur]);
p->apCsr[iCur] = 0;
}
if (SQLITE_OK==sqlite3VdbeMemClearAndResize(pMem, nByte)) {
p->apCsr[iCur] = pCx = (VdbeCursor*)pMem->z;
memset(pCx, 0, offsetof(VdbeCursor,uc));
pCx->eCurType = eCurType;
pCx->nField = nField;
if (eCurType==CURTYPE_TARANTOOL) {
pCx->uc.pCursor = (BtCursor*)
&pMem->z[ROUND8(sizeof(VdbeCursor))+sizeof(u32)*nField];
sqlite3CursorZero(pCx->uc.pCursor);
}
}
return pCx;
}
/*
* Try to convert a value into a numeric representation if we can
* do so without loss of information. In other words, if the string
* looks like a number, convert it into a number. If it does not
* look like a number, leave it alone.
*
* If the bTryForInt flag is true, then extra effort is made to give
* an integer representation. Strings that look like floating point
* values but which have no fractional component (example: '48.00')
* will have a MEM_Int representation when bTryForInt is true.
*
* If bTryForInt is false, then if the input string contains a decimal
* point or exponential notation, the result is only MEM_Real, even
* if there is an exact integer representation of the quantity.
*/
static void
applyNumericAffinity(Mem *pRec, int bTryForInt)
{
double rValue;
i64 iValue;
assert((pRec->flags & (MEM_Str|MEM_Int|MEM_Real))==MEM_Str);
if (sqlite3AtoF(pRec->z, &rValue, pRec->n)==0) return;
if (0 == sql_atoi64(pRec->z, (int64_t *)&iValue, pRec->n)) {
pRec->u.i = iValue;
pRec->flags |= MEM_Int;
} else {
pRec->u.r = rValue;
pRec->flags |= MEM_Real;
if (bTryForInt) sqlite3VdbeIntegerAffinity(pRec);
}
}
/*
* Processing is determine by the affinity parameter:
*
* AFFINITY_INTEGER:
* AFFINITY_REAL:
* AFFINITY_NUMERIC:
* Try to convert pRec to an integer representation or a
* floating-point representation if an integer representation
* is not possible. Note that the integer representation is
* always preferred, even if the affinity is REAL, because
* an integer representation is more space efficient on disk.
*
* AFFINITY_TEXT:
* Convert pRec to a text representation.
*
* AFFINITY_BLOB:
* No-op. pRec is unchanged.
*/
static void
applyAffinity(
Mem *pRec, /* The value to apply affinity to */
char affinity /* The affinity to be applied */
)
{
if (affinity>=AFFINITY_NUMERIC) {
assert(affinity==AFFINITY_INTEGER || affinity==AFFINITY_REAL
|| affinity==AFFINITY_NUMERIC);
if ((pRec->flags & MEM_Int)==0) { /*OPTIMIZATION-IF-FALSE*/
if ((pRec->flags & MEM_Real)==0) {
if (pRec->flags & MEM_Str) applyNumericAffinity(pRec,1);
} else {
sqlite3VdbeIntegerAffinity(pRec);
}
}
} else if (affinity==AFFINITY_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. It would be harmless to repeat the conversion if
* there is already a string rep, but it is pointless to waste those
* CPU cycles.
*/
if (0==(pRec->flags&MEM_Str)) { /*OPTIMIZATION-IF-FALSE*/
if ((pRec->flags&(MEM_Real|MEM_Int))) {
sqlite3VdbeMemStringify(pRec, 1);
}
}
pRec->flags &= ~(MEM_Real|MEM_Int);
}
}
/*
* Try to convert the type of a function argument or a result column
* into a numeric representation. Use either INTEGER or REAL whichever
* is appropriate. But only do the conversion if it is possible without
* loss of information and return the revised type of the argument.
*/
int sqlite3_value_numeric_type(sqlite3_value *pVal) {
int eType = sqlite3_value_type(pVal);
if (eType==SQLITE_TEXT) {
Mem *pMem = (Mem*)pVal;
applyNumericAffinity(pMem, 0);
eType = sqlite3_value_type(pVal);
}
return eType;
}
/*
* Exported version of applyAffinity(). This one works on sqlite3_value*,
* not the internal Mem* type.
*/
void
sqlite3ValueApplyAffinity(
sqlite3_value *pVal,
u8 affinity)
{
applyAffinity((Mem *)pVal, affinity);
}
/*
* pMem currently only holds a string type (or maybe a BLOB that we can
* interpret as a string if we want to). Compute its corresponding
* numeric type, if has one. Set the pMem->u.r and pMem->u.i fields
* accordingly.
*/
static u16 SQLITE_NOINLINE computeNumericType(Mem *pMem)
{
assert((pMem->flags & (MEM_Int|MEM_Real))==0);
assert((pMem->flags & (MEM_Str|MEM_Blob))!=0);
if (sqlite3AtoF(pMem->z, &pMem->u.r, pMem->n)==0)
return 0;
if (sql_atoi64(pMem->z, (int64_t *)&pMem->u.i, pMem->n)==SQLITE_OK)
return MEM_Int;
return MEM_Real;
}
/*
* Return the numeric type for pMem, either MEM_Int or MEM_Real or both or
* none.
*
* Unlike applyNumericAffinity(), this routine does not modify pMem->flags.
* But it does set pMem->u.r and pMem->u.i appropriately.
*/
static u16 numericType(Mem *pMem)
{
if (pMem->flags & (MEM_Int|MEM_Real)) {
return pMem->flags & (MEM_Int|MEM_Real);
}
if (pMem->flags & (MEM_Str|MEM_Blob)) {
return computeNumericType(pMem);
}
return 0;
}
#ifdef SQLITE_DEBUG
/*
* Write a nice string representation of the contents of cell pMem
* into buffer zBuf, length nBuf.
*/
void
sqlite3VdbeMemPrettyPrint(Mem *pMem, char *zBuf)
{
char *zCsr = zBuf;
int f = pMem->flags;
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';
}
sqlite3_snprintf(100, zCsr, "%c", c);
zCsr += sqlite3Strlen30(zCsr);
sqlite3_snprintf(100, zCsr, "%d[", pMem->n);
zCsr += sqlite3Strlen30(zCsr);
for(i=0; i<16 && i<pMem->n; i++) {
sqlite3_snprintf(100, zCsr, "%02X", ((int)pMem->z[i] & 0xFF));
zCsr += sqlite3Strlen30(zCsr);
}
for(i=0; i<16 && i<pMem->n; i++) {
char z = pMem->z[i];
if (z<32 || z>126) *zCsr++ = '.';
else *zCsr++ = z;
}
sqlite3_snprintf(100, zCsr, "]%s", "(8)");
zCsr += sqlite3Strlen30(zCsr);
if (f & MEM_Zero) {
sqlite3_snprintf(100, zCsr,"+%dz",pMem->u.nZero);
zCsr += sqlite3Strlen30(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;
sqlite3_snprintf(100, &zBuf[k], "%d", pMem->n);
k += sqlite3Strlen30(&zBuf[k]);
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++] = ']';
sqlite3_snprintf(100,&zBuf[k],"(8)");
k += sqlite3Strlen30(&zBuf[k]);
zBuf[k++] = 0;
}
}
#endif
#ifdef SQLITE_DEBUG
/*
* Print the value of a register for tracing purposes:
*/
static void
memTracePrint(Mem *p)
{
if (p->flags & MEM_Undefined) {
printf(" undefined");
} else if (p->flags & MEM_Null) {
printf(" NULL");
} else if ((p->flags & (MEM_Int|MEM_Str))==(MEM_Int|MEM_Str)) {
printf(" si:%lld", p->u.i);
} else if (p->flags & MEM_Int) {
printf(" i:%lld", p->u.i);
#ifndef SQLITE_OMIT_FLOATING_POINT
} else if (p->flags & MEM_Real) {
printf(" r:%g", p->u.r);
#endif
} else {
char zBuf[200];
sqlite3VdbeMemPrettyPrint(p, zBuf);
printf(" %s", zBuf);
}
if (p->flags & MEM_Subtype) printf(" subtype=0x%02x", p->subtype);
}
static void
registerTrace(int iReg, Mem *p) {
printf("REG[%d] = ", iReg);
memTracePrint(p);
printf("\n");
}
#endif
#ifdef SQLITE_DEBUG
# define REGISTER_TRACE(R,M) \
if(user_session->sql_flags&SQLITE_VdbeTrace) registerTrace(R,M);
#else
# define REGISTER_TRACE(R,M)
#endif
#ifdef VDBE_PROFILE
/*
* hwtime.h contains inline assembler code for implementing
* high-performance timing routines.
*/
#include "hwtime.h"
#endif
/*
* Return the register of pOp->p2 after first preparing it to be
* overwritten with an integer value.
*/
static SQLITE_NOINLINE Mem *
out2PrereleaseWithClear(Mem *pOut)
{
sqlite3VdbeMemSetNull(pOut);
pOut->flags = MEM_Int;
return pOut;
}
static Mem *
out2Prerelease(Vdbe *p, VdbeOp *pOp)
{
Mem *pOut;
assert(pOp->p2>0);
assert(pOp->p2<=(p->nMem+1 - p->nCursor));
pOut = &p->aMem[pOp->p2];
memAboutToChange(p, pOut);
if (VdbeMemDynamic(pOut)) { /*OPTIMIZATION-IF-FALSE*/
return out2PrereleaseWithClear(pOut);
} else {
pOut->flags = MEM_Int;
return pOut;
}
}
/*
* Execute as much of a VDBE program as we can.
* This is the core of sqlite3_step().
*/
int sqlite3VdbeExec(Vdbe *p)
{
Op *aOp = p->aOp; /* Copy of p->aOp */
Op *pOp = aOp; /* Current operation */
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
Op *pOrigOp; /* Value of pOp at the top of the loop */
#endif
#ifdef SQLITE_DEBUG
int nExtraDelete = 0; /* Verifies FORDELETE and AUXDELETE flags */
#endif
int rc = SQLITE_OK; /* Value to return */
sqlite3 *db = p->db; /* The database */
u8 resetSchemaOnFault = 0; /* Reset schema after an error if positive */
int iCompare = 0; /* Result of last comparison */
unsigned nVmStep = 0; /* Number of virtual machine steps */
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
unsigned nProgressLimit = 0;/* Invoke xProgress() when nVmStep reaches this */
#endif
Mem *aMem = p->aMem; /* Copy of p->aMem */
Mem *pIn1 = 0; /* 1st input operand */
Mem *pIn2 = 0; /* 2nd input operand */
Mem *pIn3 = 0; /* 3rd input operand */
Mem *pOut = 0; /* Output operand */
int *aPermute = 0; /* Permutation of columns for OP_Compare */
#ifdef VDBE_PROFILE
u64 start; /* CPU clock count at start of opcode */
#endif
struct session *user_session = current_session();
/*** INSERT STACK UNION HERE ***/
assert(p->magic==VDBE_MAGIC_RUN); /* sqlite3_step() verifies this */
if (p->rc==SQLITE_NOMEM) {
/* This happens if a malloc() inside a call to sqlite3_column_text() or
* sqlite3_column_text16() failed.
*/
goto no_mem;
}
assert(p->rc==SQLITE_OK || (p->rc&0xff)==SQLITE_BUSY);
p->rc = SQLITE_OK;
p->iCurrentTime = 0;
assert(p->explain==0);
p->pResultSet = 0;
db->busyHandler.nBusy = 0;
if (db->u1.isInterrupted) goto abort_due_to_interrupt;
sqlite3VdbeIOTraceSql(p);
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
if (db->xProgress) {
u32 iPrior = p->aCounter[SQLITE_STMTSTATUS_VM_STEP];
assert(0 < db->nProgressOps);
nProgressLimit = db->nProgressOps - (iPrior % db->nProgressOps);
}
#endif
#ifdef SQLITE_DEBUG
sqlite3BeginBenignMalloc();
if (p->pc==0
&& (user_session->sql_flags&
(SQLITE_VdbeListing|SQLITE_VdbeEQP|SQLITE_VdbeTrace))!=0
) {
int i;
int once = 1;
sqlite3VdbePrintSql(p);
if (user_session->sql_flags & SQLITE_VdbeListing) {
printf("VDBE Program Listing:\n");
for(i=0; i<p->nOp; i++) {
sqlite3VdbePrintOp(stdout, i, &aOp[i]);
}
}
if (user_session->sql_flags & SQLITE_VdbeEQP) {
for(i=0; i<p->nOp; i++) {
if (aOp[i].opcode==OP_Explain) {
if (once) printf("VDBE Query Plan:\n");
printf("%s\n", aOp[i].p4.z);
once = 0;
}
}
}
if (user_session->sql_flags & SQLITE_VdbeTrace) printf("VDBE Trace:\n");
}
sqlite3EndBenignMalloc();
#endif
for(pOp=&aOp[p->pc]; 1; pOp++) {
/* Errors are detected by individual opcodes, with an immediate
* jumps to abort_due_to_error.
*/
assert(rc==SQLITE_OK);
assert(pOp>=aOp && pOp<&aOp[p->nOp]);
#ifdef VDBE_PROFILE
start = sqlite3Hwtime();
#endif
nVmStep++;
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
if (p->anExec) p->anExec[(int)(pOp-aOp)]++;
#endif
/* Only allow tracing if SQLITE_DEBUG is defined.
*/
#ifdef SQLITE_DEBUG
if (user_session->sql_flags & SQLITE_VdbeTrace) {
sqlite3VdbePrintOp(stdout, (int)(pOp - aOp), pOp);
}
#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
/* Sanity checking on other operands */
#ifdef SQLITE_DEBUG
{
u8 opProperty = sqlite3OpcodeProperty[pOp->opcode];
if ((opProperty & OPFLG_IN1)!=0) {
assert(pOp->p1>0);
assert(pOp->p1<=(p->nMem+1 - p->nCursor));
assert(memIsValid(&aMem[pOp->p1]));
assert(sqlite3VdbeCheckMemInvariants(&aMem[pOp->p1]));
REGISTER_TRACE(pOp->p1, &aMem[pOp->p1]);
}
if ((opProperty & OPFLG_IN2)!=0) {
assert(pOp->p2>0);
assert(pOp->p2<=(p->nMem+1 - p->nCursor));
assert(memIsValid(&aMem[pOp->p2]));
assert(sqlite3VdbeCheckMemInvariants(&aMem[pOp->p2]));
REGISTER_TRACE(pOp->p2, &aMem[pOp->p2]);
}
if ((opProperty & OPFLG_IN3)!=0) {
assert(pOp->p3>0);
assert(pOp->p3<=(p->nMem+1 - p->nCursor));
assert(memIsValid(&aMem[pOp->p3]));
assert(sqlite3VdbeCheckMemInvariants(&aMem[pOp->p3]));
REGISTER_TRACE(pOp->p3, &aMem[pOp->p3]);
}
if ((opProperty & OPFLG_OUT2)!=0) {
assert(pOp->p2>0);
assert(pOp->p2<=(p->nMem+1 - p->nCursor));
memAboutToChange(p, &aMem[pOp->p2]);
}
if ((opProperty & OPFLG_OUT3)!=0) {
assert(pOp->p3>0);
assert(pOp->p3<=(p->nMem+1 - p->nCursor));
memAboutToChange(p, &aMem[pOp->p3]);
}
}
#endif
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
pOrigOp = pOp;
#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.
*
* Other keywords in the comment that follows each case are used to
* construct the OPFLG_INITIALIZER value that initializes opcodeProperty[].
* Keywords include: in1, in2, in3, out2, out3. See
* the mkopcodeh.awk script for additional information.
*
* 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.
*
* The P1 parameter is not actually used by this opcode. However, it
* is sometimes set to 1 instead of 0 as a hint to the command-line shell
* that this Goto is the bottom of a loop and that the lines from P2 down
* to the current line should be indented for EXPLAIN output.
*/
case OP_Goto: { /* jump */
jump_to_p2_and_check_for_interrupt:
pOp = &aOp[pOp->p2 - 1];
/* Opcodes that are used as the bottom of a loop (OP_Next, OP_Prev,
* OP_RowSetNext, or OP_SorterNext) all jump here upon
* completion. Check to see if sqlite3_interrupt() has been called
* or if the progress callback needs to be invoked.
*
* This code uses unstructured "goto" statements and does not look clean.
* But that is not due to sloppy coding habits. The code is written this
* way for performance, to avoid having to run the interrupt and progress
* checks on every opcode. This helps sqlite3_step() to run about 1.5%
* faster according to "valgrind --tool=cachegrind"
*/
check_for_interrupt:
if (db->u1.isInterrupted) goto abort_due_to_interrupt;
#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!=0 && nVmStep>=nProgressLimit) {
assert(db->nProgressOps!=0);
nProgressLimit = nVmStep + db->nProgressOps - (nVmStep%db->nProgressOps);
if (db->xProgress(db->pProgressArg)) {
rc = SQLITE_INTERRUPT;
goto abort_due_to_error;
}
}
#endif
break;
}
/* Opcode: Gosub P1 P2 * * *
*
* Write the current address onto register P1
* and then jump to address P2.
*/
case OP_Gosub: { /* jump */
assert(pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor));
pIn1 = &aMem[pOp->p1];
assert(VdbeMemDynamic(pIn1)==0);
memAboutToChange(p, pIn1);
pIn1->flags = MEM_Int;
pIn1->u.i = (int)(pOp-aOp);
REGISTER_TRACE(pOp->p1, pIn1);
/* Most jump operations do a goto to this spot in order to update
* the pOp pointer.
*/
jump_to_p2:
pOp = &aOp[pOp->p2 - 1];
break;
}
/* Opcode: Return P1 * * * *
*
* Jump to the next instruction after the address in register P1. After
* the jump, register P1 becomes undefined.
*/
case OP_Return: { /* in1 */
pIn1 = &aMem[pOp->p1];
assert(pIn1->flags==MEM_Int);
pOp = &aOp[pIn1->u.i];
pIn1->flags = MEM_Undefined;
break;
}
/* Opcode: InitCoroutine P1 P2 P3 * *
*
* Set up register P1 so that it will Yield to the coroutine
* located at address P3.
*
* If P2!=0 then the coroutine implementation immediately follows
* this opcode. So jump over the coroutine implementation to
* address P2.
*
* See also: EndCoroutine
*/
case OP_InitCoroutine: { /* jump */
assert(pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor));
assert(pOp->p2>=0 && pOp->p2<p->nOp);
assert(pOp->p3>=0 && pOp->p3<p->nOp);
pOut = &aMem[pOp->p1];
assert(!VdbeMemDynamic(pOut));
pOut->u.i = pOp->p3 - 1;
pOut->flags = MEM_Int;
if (pOp->p2) goto jump_to_p2;
break;
}
/* Opcode: EndCoroutine P1 * * * *
*
* The instruction at the address in register P1 is a Yield.
* Jump to the P2 parameter of that Yield.
* After the jump, register P1 becomes undefined.
*
* See also: InitCoroutine
*/
case OP_EndCoroutine: { /* in1 */
VdbeOp *pCaller;
pIn1 = &aMem[pOp->p1];
assert(pIn1->flags==MEM_Int);
assert(pIn1->u.i>=0 && pIn1->u.i<p->nOp);
pCaller = &aOp[pIn1->u.i];
assert(pCaller->opcode==OP_Yield);
assert(pCaller->p2>=0 && pCaller->p2<p->nOp);
pOp = &aOp[pCaller->p2 - 1];
pIn1->flags = MEM_Undefined;
break;
}
/* Opcode: Yield P1 P2 * * *
*
* Swap the program counter with the value in register P1. This
* has the effect of yielding to a coroutine.
*
* If the coroutine that is launched by this instruction ends with
* Yield or Return then continue to the next instruction. But if
* the coroutine launched by this instruction ends with
* EndCoroutine, then jump to P2 rather than continuing with the
* next instruction.
*
* See also: InitCoroutine
*/
case OP_Yield: { /* in1, jump */
int pcDest;
pIn1 = &aMem[pOp->p1];
assert(VdbeMemDynamic(pIn1)==0);
pIn1->flags = MEM_Int;
pcDest = (int)pIn1->u.i;
pIn1->u.i = (int)(pOp - aOp);
REGISTER_TRACE(pOp->p1, pIn1);
pOp = &aOp[pcDest];
break;
}
/* Opcode: HaltIfNull P1 P2 P3 P4 P5
* Synopsis: if r[P3]=null halt
*
* Check the value in register P3. If it is NULL then Halt using
* parameter P1, P2, and P4 as if this were a Halt instruction. If the
* value in register P3 is not NULL, then this routine is a no-op.
* The P5 parameter should be 1.
*/
case OP_HaltIfNull: { /* in3 */
pIn3 = &aMem[pOp->p3];
if ((pIn3->flags & MEM_Null)==0) break;
/* Fall through into OP_Halt */
FALLTHROUGH;
}
/* Opcode: Halt P1 P2 * P4 P5
*
* Exit immediately. All open cursors, 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==ON_CONFLICT_ACTION_FAIL. Do the rollback
* if P2==ON_CONFLICT_ACTION_ROLLBACK. If
* P2==ON_CONFLICT_ACTION_ABORT, then back out all changes that
* have occurred during this execution of the VDBE, but do not
* rollback the transaction.
*
* If P4 is not null then it is an error message string.
*
* If P1 is SQL_TARANTOOL_ERROR then P5 is a ClientError code and
* P4 is error message to set. Else P5 is a value between 0 and 4,
* inclusive, that modifies the P4 string.
*
* 0: (no change)
* 1: NOT NULL contraint failed: P4
* 2: UNIQUE constraint failed: P4
* 3: CHECK constraint failed: P4
* 4: FOREIGN KEY constraint failed: P4
*
* If P5 is not zero and P4 is NULL, then everything after the
* ":" is omitted.
*
* 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: {
VdbeFrame *pFrame;
int pcx;
pcx = (int)(pOp - aOp);
if (pOp->p1==SQLITE_OK && p->pFrame) {
/* Halt the sub-program. Return control to the parent frame. */
pFrame = p->pFrame;
p->pFrame = pFrame->pParent;
p->nFrame--;
sqlite3VdbeSetChanges(db, p->nChange);
pcx = sqlite3VdbeFrameRestore(pFrame);
if (pOp->p2 == ON_CONFLICT_ACTION_IGNORE) {
/* Instruction pcx is the OP_Program that invoked the sub-program
* currently being halted. If the p2 instruction of this OP_Halt
* instruction is set to ON_CONFLICT_ACTION_IGNORE, then
* the sub-program is throwing
* an IGNORE exception. In this case jump to the address specified
* as the p2 of the calling OP_Program.