short BiArithCount::codeGen(Generator * generator)
{
Attributes ** attr;
ExpGenerator * eg = generator->getExpGenerator();
if (eg->genItemExpr(this, &attr, (1+getArity()), -1) == 1)
return 0;
// if temp space is needed for this operation, set it.
if (attr[0]->isComplexType())
{
eg->addTempsLength(((ComplexType *)attr[0])->setTempSpaceInfo(getOperatorType(),
#pragma nowarn(1506) // warning elimination
eg->getTempsLength()));
#pragma warn(1506) // warning elimination
}
ex_arith_count_clause * arith_clause =
new(generator->getSpace())
ex_arith_count_clause(getOperatorType(),
attr,
generator->getSpace());
generator->getExpGenerator()->linkClause(this, arith_clause);
return 0;
}
short UnArith::codeGen(Generator * generator)
{
Attributes ** attr;
ExpGenerator * eg = generator->getExpGenerator();
if (eg->genItemExpr(this, &attr, (1+getArity()), -1) == 1)
return 0;
ex_arith_clause * arith_clause =
new(generator->getSpace())
ex_arith_clause(getOperatorType(), attr, generator->getSpace(),
0, FALSE);
generator->getExpGenerator()->linkClause(this, arith_clause);
return 0;
}
// ItmBlockFunction::codeGen
//
// The Block function executes the code represented by both its children and
// then returns the result of the right child (child(1)).
//
short ItmBlockFunction::codeGen(Generator * generator) {
// Get local handles...
//
Attributes **attr;
Space* space = generator->getSpace();
CollHeap *heap = generator->wHeap();
ExpGenerator *exp = generator->getExpGenerator();
// If this Block has already been codeGenned, then bug out...
// Otherwise, allocate space for the result if necessary and set
// attr[0] to point to the result attribute data. Also, mark this
// node as codeGenned.
//
if (exp->genItemExpr(this, &attr, 2, 0) == 1)
return 0;
// CodeGen the left child.
//
child(0)->codeGen(generator);
// CodeGen the right child.
//
child(1)->codeGen(generator);
// The result of the Block is the result of the right child. Set
// the src attribute for the convert (added below) to be the right child
// The dst attribute has already been set in genItemExpr().
//
attr[1] = generator->getMapInfo
(child(1)->castToItemExpr()->getValueId())->getAttr();
// Allocate a convert clause to move the result from child(1) to the
// result of this node. This move is necessary so that future
// side-effects of the result of child(1) -- if it is a local variable,
// for instance -- will not change the result of the Block.
//
ex_conv_clause * convClause =
new(generator->getSpace()) ex_conv_clause
(getOperatorType(), attr, space);
generator->getExpGenerator()->linkClause(this, convClause);
return 0;
}
short BiArith::codeGen(Generator * generator)
{
Attributes ** attr;
ExpGenerator * eg = generator->getExpGenerator();
if (eg->genItemExpr(this, &attr, (1+getArity()), -1) == 1)
return 0;
// if temp space is needed for this operation, set it.
if (attr[0]->isComplexType())
{
eg->addTempsLength(((ComplexType *)attr[0])->setTempSpaceInfo(getOperatorType(),
#pragma nowarn(1506) // warning elimination
eg->getTempsLength()));
#pragma warn(1506) // warning elimination
}
attr[0]->resetlastdaymonthflag();
attr[0]->resetlastdayonerrflag();
// Check to see which type of rounding is needed for add_months, date_add
// functions. Set flags here for use in executor datetime.cpp.
if (isStandardNormalization())
attr[0]->setlastdayonerrflag();
if (isKeepLastDay())
attr[0]->setlastdaymonthflag();
ex_arith_clause * arith_clause =
new(generator->getSpace())
ex_arith_clause(getOperatorType(), attr, generator->getSpace(),
(short)getRoundingMode(),
getDivToDownscale());
generator->getExpGenerator()->linkClause(this, arith_clause);
return 0;
}
// ItmDoWhileFunction::codeGen
//
// The DoWhile function executes the code represented by child(0) until
// the condition represented by child(1) becomes false. The result of
// the DoWhile is the final value of child(0).
//
// The looping is accomplished by inserting a NOOP/BRANCH pair. The NOOP
// is inserted before generating the code for either child and serves as a
// branch target. The BRANCH is inserted after generating the code for
// both children and is targeted at the NOOP clause based on the result of
// child(1). Between the NOOP and the BRANCH the body of the loop (child(0))
// and the termination condition (child(1)) are repeatedly evaluated. After
// the branch the final result of the loop body is assigned as the result
// of the DoWhile.
//
short ItmDoWhileFunction::codeGen(Generator * generator) {
// Get local handles...
//
Attributes **attr;
Space* space = generator->getSpace();
CollHeap *wHeap = generator->wHeap();
ExpGenerator *exp = generator->getExpGenerator();
// If this DoWhile has already been codeGenned, then bug out...
// Otherwise, allocate space for the result if necessary and set
// attr[0] to point to the result attribute data. Also, mark this
// node as codeGenned.
//
if (exp->genItemExpr(this, &attr, 2, 0) == 1)
return 0;
// Insert the NOOP clause to use as the branch target for the
// start of the loop body.
//
ex_clause * branchTarget = new(space) ex_noop_clause();
exp->linkClause(this, branchTarget);
// CodeGen the body of the loop.
//
child(0)->codeGen(generator);
// The result of the DoWhile is the result of the body of the loop. Set
// the src attribute for the convert (added below) to be the body of
// the while loop. The dst attribute has already been set in genItemExpr().
//
attr[1] = generator->getMapInfo
(child(0)->castToItemExpr()->getValueId())->getAttr();
// CodeGen the loop termination condition.
//
child(1)->codeGen(generator);
// Construct a BRANCH clause to loop back and repeat the expression
// and condition if the condition evaluates to TRUE.
//
Attributes ** branchAttrs = new(wHeap) Attributes*[2];
Attributes *boolAttr = generator->getMapInfo
(child(1)->castToItemExpr()->getValueId())->getAttr();
branchAttrs[0] = boolAttr->newCopy(wHeap);
branchAttrs[1] = boolAttr->newCopy(wHeap);
// branchAttrs[0]->copyLocationAttrs(boolAttr);
// branchAttrs[1]->copyLocationAttrs(boolAttr);
branchAttrs[0]->resetShowplan();
ex_branch_clause * branchClause
= new(space) ex_branch_clause(ITM_OR, branchAttrs, space);
branchClause->set_branch_clause(branchTarget);
// Insert the branch clause into the expression.
//
exp->linkClause(this, branchClause);
// Allocate a convert clause to move the result from child(0) to the
// result of this node. This move is necessary so that future
// side-effects of the result of child(0) -- if it is a local variable,
// for instance -- will not change the result of the DoWhile.
//
ex_conv_clause * convClause =
new(generator->getSpace()) ex_conv_clause
(getOperatorType(), attr, space);
exp->linkClause(this, convClause);
return 0;
}
