opt_aliases.c

一个内存数据库的源代码这是服务器端还有客户端

#line 90 "/export/scratch0/monet/monet.GNU.64.64.d.14791/MonetDB5/src/optimizer/opt_aliases.mx"
#include "mal_config.h"
#include "opt_aliases.h"
static int
OPTisAlias(InstrPtr p){
	if( p->token == ASSIGNsymbol &&
		p->barrier == 0 && 
		p->argc == 2)
		return TRUE;
	return FALSE;
}

static void
OPTremap(InstrPtr p, int *alias){
	int i;
	for(i=0;i<p->argc; i++)
		getArg(p,i)= alias[getArg(p,i)];
}

static int
OPTaliasesImplementation(MalBlkPtr mb, MalStkPtr stk, InstrPtr p)
{
	int i,k=1, limit, actions=0;
	int *alias;

	(void) stk;
	alias= (int*) alloca(sizeof(int)* mb->vtop);
	for(i=0; i<mb->vtop; i++) alias[i]=i;

	setLifespan(mb);
	limit= mb->stop;
	for (i = 1; i < limit; i++){
		p= getInstrPtr(mb,i);
		mb->stmt[k++]= p;
		if( OPTisAlias(p)){
			if( p->argc ==2 && getLastUpdate(mb,getArg(p,0)) == i  &&
				getBeginLifespan(mb,getArg(p,0)) == i  &&
				getLastUpdate(mb,getArg(p,1)) < i ){
				alias[getArg(p,0)]= alias[getArg(p,1)];
				freeInstruction(p);
				actions++;
				k--;
			} else
				OPTremap(p,alias);
		} else
			OPTremap(p,alias);
	}
	for(i=k; i<limit; i++)
		mb->stmt[i]= NULL;
	mb->stop= k;
	return actions;
}


#line 145 "/export/scratch0/monet/monet.GNU.64.64.d.14791/MonetDB5/src/optimizer/opt_aliases.mx"

#line 143 "/export/scratch0/monet/monet.GNU.64.64.d.14791/MonetDB5/src/optimizer/opt_aliases.mx"
/* #define _DEBUG_OPTIMIZER_*/
str OPTaliases(MalBlkPtr mb, MalStkPtr stk, InstrPtr p){
	str modnme;
	str fcnnme;
	Module  scope=NULL;
	Symbol s= NULL;
	lng clk= GDKusec();
	int actions = 0;

	optimizerInit();
	if( p )
		removeInstruction(mb, p);
#ifdef _DEBUG_OPTIMIZER_
	stream_printf(GDKout,"apply aliases\n");
	printFunction(GDKout,mb,LIST_MAL_ALL);
#endif
	if( p && p->argc > 1 && getFunctionId(p) != multiplexRef){
#ifdef _DEBUG_OPTIMIZER_
		stream_printf(GDKout,"locate function aliases\n");
#endif
		if( getArgType(mb,p,1) != TYPE_str ||
			getArgType(mb,p,2) != TYPE_str ||
			!isConstant(mb,getArg(p,1)) ||
			!isConstant(mb,getArg(p,2))
		) {
			char buf[1024];
			snprintf(buf,1024, "Optimizer requires constant string arguments\n");
			throw(MAL, "optimizer.aliases",buf);
		}
		if( stk != 0){
			modnme= (str)getArgValue(stk,p,1);
			fcnnme= (str)getArgValue(stk,p,2);
		} else {
			modnme= getArgDefault(mb,p,1);
			fcnnme= getArgDefault(mb,p,2);
		}
		scope = findModule(MCgetClient()->nspace,putName(modnme,strlen(modnme)) );
		if( scope)
			s= findSymbolInModule(scope,putName(fcnnme,strlen(fcnnme)));

		if( s == NULL) {
			char buf[1024];
			snprintf(buf,1024, "Could not find %s.%s\n",modnme,fcnnme);
			throw(MAL, "optimizer.aliases",buf);
		}
#ifdef _DEBUG_OPTIMIZER_
		stream_printf(GDKout,"aliases %s %d\n",modnme,fcnnme);
#endif
		mb = s->def;
		stk= 0;
	} 
	if( mb->errors )
		return MAL_SUCCEED;
	addtoMalBlkHistory(mb);
	actions= OPTaliasesImplementation(mb,stk,p);
#ifdef _DEBUG_OPTIMIZER_
	stream_printf(GDKout,"finished aliases %d\n",actions);
	printFunction(GDKout,mb,LIST_MAL_ALL);
#endif
    optimizerCheck(mb, "optimizer.aliases", actions, GDKusec() - clk,OPT_CHECK_ALL);
	return MAL_SUCCEED;
}


#line 145 "/export/scratch0/monet/monet.GNU.64.64.d.14791/MonetDB5/src/optimizer/opt_aliases.mx"



#line 147 "/export/scratch0/monet/monet.GNU.64.64.d.14791/MonetDB5/src/optimizer/opt_aliases.mx"