str
SQLengineIntern(Client c, backend *be)
{
str msg = MAL_SUCCEED;
MalStkPtr oldglb = c->glb;
char oldlang = be->language;
mvc *m = be->mvc;
InstrPtr p;
MalBlkPtr mb;
if (oldlang == 'X') { /* return directly from X-commands */
sqlcleanup(be->mvc, 0);
return MAL_SUCCEED;
}
if (m->emod & mod_explain) {
if (be->q && be->q->code)
printFunction(c->fdout, ((Symbol) (be->q->code))->def, 0, LIST_MAL_NAME | LIST_MAL_VALUE | LIST_MAL_MAPI);
else if (be->q)
msg = createException(PARSE, "SQLparser", "%s", (*m->errstr) ? m->errstr : "39000!program contains errors");
else if (c->curprg->def)
printFunction(c->fdout, c->curprg->def, 0, LIST_MAL_NAME | LIST_MAL_VALUE | LIST_MAL_MAPI);
goto cleanup_engine;
}
if (m->emod & mod_dot) {
if (be->q && be->q->code)
showFlowGraph(((Symbol) (be->q->code))->def, 0, "stdout-mapi");
else if (be->q)
msg = createException(PARSE, "SQLparser", "%s", (*m->errstr) ? m->errstr : "39000!program contains errors");
else if (c->curprg->def)
showFlowGraph(c->curprg->def, 0, "stdout-mapi");
goto cleanup_engine;
}
#ifdef SQL_SCENARIO_DEBUG
mnstr_printf(GDKout, "#Ready to execute SQL statement\n");
#endif
if (c->curprg->def->stop == 1) {
sqlcleanup(be->mvc, 0);
return MAL_SUCCEED;
}
if (m->emode == m_inplace) {
msg = SQLexecutePrepared(c, be, be->q);
goto cleanup_engine;
}
if (m->emode == m_prepare)
goto cleanup_engine;
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = 0;
be->language = 'D';
/*
* The code below is copied from MALengine, which handles execution
* in the context of a user global environment. We have a private
* environment.
*/
if (MALcommentsOnly(c->curprg->def)) {
msg = MAL_SUCCEED;
} else {
msg = (str) runMAL(c, c->curprg->def, 0, 0);
}
cleanup_engine:
if (m->type == Q_SCHEMA)
qc_clean(m->qc);
if (msg) {
enum malexception type = getExceptionType(msg);
if (type == OPTIMIZER) {
MSresetInstructions(c->curprg->def, 1);
freeVariables(c, c->curprg->def, NULL, be->vtop);
be->language = oldlang;
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = oldglb;
if ( msg)
GDKfree(msg);
return SQLrecompile(c, be); // retry compilation
} else {
/* don't print exception decoration, just the message */
char *n = NULL;
char *o = msg;
while ((n = strchr(o, '\n')) != NULL) {
*n = '\0';
mnstr_printf(c->fdout, "!%s\n", getExceptionMessage(o));
*n++ = '\n';
o = n;
}
if (*o != 0)
mnstr_printf(c->fdout, "!%s\n", getExceptionMessage(o));
}
showErrors(c);
m->session->status = -10;
}
mb = c->curprg->def;
if (m->type != Q_SCHEMA && be->q && msg) {
qc_delete(m->qc, be->q);
} else if (m->type != Q_SCHEMA && be->q && mb && varGetProp(mb, getArg(p = getInstrPtr(mb, 0), 0), runonceProp)) {
msg = SQLCacheRemove(c, getFunctionId(p));
qc_delete(be->mvc->qc, be->q);
///* this should invalidate any match */
//be->q->key= -1;
//be->q->paramlen = -1;
///* qc_delete(be->q) */
}
be->q = NULL;
sqlcleanup(be->mvc, (!msg) ? 0 : -1);
MSresetInstructions(c->curprg->def, 1);
freeVariables(c, c->curprg->def, NULL, be->vtop);
be->language = oldlang;
/*
* Any error encountered during execution should block further processing
* unless auto_commit has been set.
*/
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = oldglb;
return msg;
}
str
MALengine(Client c)
{
Symbol prg;
str msg = MAL_SUCCEED;
MalBlkRecord oldstate = *c->curprg->def;
oldstate.stop = 0;
if (c->blkmode)
return MAL_SUCCEED;
prg = c->curprg;
if (prg == NULL)
throw(SYNTAX, "mal.engine", SYNTAX_SIGNATURE);
if (prg->def == NULL)
throw(SYNTAX, "mal.engine", SYNTAX_SIGNATURE);
if (prg->def->errors > 0) {
showErrors(c);
if (c->listing)
printFunction(c->fdout, c->curprg->def, 0, c->listing);
MSresetVariables(c, c->curprg->def, c->glb, oldstate.vtop);
resetMalBlk(c->curprg->def, 1);
throw(MAL, "mal.engine", PROGRAM_GENERAL);
}
if (prg->def->stop == 1 || MALcommentsOnly(prg->def))
return 0; /* empty block */
if (c->glb) {
if (prg->def && c->glb->stksize < prg->def->vsize){
c->glb = reallocGlobalStack(c->glb, prg->def->vsize);
if( c->glb == NULL)
throw(MAL, "mal.engine", MAL_MALLOC_FAIL);
}
c->glb->stktop = prg->def->vtop;
c->glb->blk = prg->def;
c->glb->cmd = (c->itrace && c->itrace != 'C') ? 'n' : 0;
}
if (c->listing > 1)
printFunction(c->fdout, c->curprg->def, 0, c->listing);
/*
* In interactive mode we should avoid early garbage collection of values.
* This can be controlled by the clean up control at the instruction level
* and marking all non-temporary variables as being (potentially) used.
*/
if (c->glb) {
c->glb->pcup = 0;
c->glb->keepAlive = TRUE; /* no garbage collection */
}
if (prg->def->errors == 0)
msg = (str) runMAL(c, prg->def, 0, c->glb);
if (msg) {
/* ignore "internal" exceptions */
str fcn = getExceptionPlace(msg); /* retrieves from "first" exception */
if (strcmp(fcn, "client.quit") != 0)
dumpExceptionsToStream(c->fdout, msg);
GDKfree(fcn);
if (!c->listing)
printFunction(c->fdout, c->curprg->def, 0, c->listing);
showErrors(c);
}
MSresetVariables(c, prg->def, c->glb, 0);
resetMalBlk(prg->def, 1);
if (c->glb) {
/* for global stacks avoid reinitialization from this point */
c->glb->stkbot = prg->def->vtop;
}
prg->def->errors = 0;
if (c->itrace)
mnstr_printf(c->fdout, "mdb>#EOD\n");
return msg;
}
