本文整理汇总了C++中ExpGenerator::decrementLevel方法的典型用法代码示例。如果您正苦于以下问题：C++ ExpGenerator::decrementLevel方法的具体用法？C++ ExpGenerator::decrementLevel怎么用？C++ ExpGenerator::decrementLevel使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ExpGenerator的用法示例。
在下文中一共展示了ExpGenerator::decrementLevel方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: codeGen
short BiLogic::codeGen(Generator * generator)
{
Attributes ** attr;
if (generator->getExpGenerator()->genItemExpr(this, &attr, (1+getArity()), 0) == 1)
return 0;
Space * space = generator->getSpace();
ExpGenerator * expGen = generator->getExpGenerator();
// Normally, if code for a value id has been generated, and if
// that value id is seen again, then code is not generated. The
// location where the result is available is returned instead.
// The case of a logical operator is different. Code is generated
// again if a value id from the left child is also present in
// the right child. This is done
// because at expression evaluation time, some of the expressions
// may be skipped due to short circuit evaluation.
//
// Allocate a new map table before generating code for each child.
// This map table contains all the temporary results produced by
// the child.
// Remove this map table after generating code for each child.
generator->appendAtEnd();
expGen->incrementLevel();
codegen_and_set_attributes(generator, attr, 2);
// generator->getExpGenerator()->setClauseLinked(FALSE);
// child(0)->codeGen(generator);
// attr[1] = generator->getAttr(child(0));
// generator->getExpGenerator()->setClauseLinked(FALSE);
/* generate boolean short circuit code */
Attributes ** branch_attr = new(generator->wHeap()) Attributes * [2];
branch_attr[0] = attr[0]->newCopy(generator->wHeap());
branch_attr[0]->copyLocationAttrs(attr[0]);
branch_attr[1] = attr[1]->newCopy(generator->wHeap());
branch_attr[1]->copyLocationAttrs(attr[1]);
branch_attr[0]->resetShowplan();
ex_branch_clause * branch_clause
= new(space) ex_branch_clause(getOperatorType(), branch_attr, space);
generator->getExpGenerator()->linkClause(0, branch_clause);
generator->removeLast();
expGen->decrementLevel();
generator->appendAtEnd();
expGen->incrementLevel();
ValueIdSet markedEntries;
// This ia a MapTable entry related fix for RangeSpec transformation.
if( child(1)->getOperatorType() == ITM_RANGE_SPEC_FUNC )
markGeneratedEntries(generator, child(1)->child(1), markedEntries);
else
markGeneratedEntries(generator, child(1), markedEntries);
// if( child(1)->getOperatorType() == ITM_RANGE_SPEC_FUNC )
// child(1)->child(1)->codeGen(generator);
// else
child(1)->codeGen(generator);
ItemExpr *rightMost;
if( child(1)->getOperatorType() == ITM_RANGE_SPEC_FUNC )
rightMost = child(1)->child(1)->castToItemExpr();
else
rightMost = child(1)->castToItemExpr();
while (rightMost->getOperatorType() == ITM_ITEM_LIST)
rightMost = rightMost->child(1)->castToItemExpr();
attr[2] = generator->
getMapInfo(rightMost->getValueId())->getAttr();
ex_bool_clause * bool_clause =
new(space) ex_bool_clause(getOperatorType(), attr, space);
generator->getExpGenerator()->linkClause(this, bool_clause);
branch_clause->set_branch_clause((ex_clause *)bool_clause);
generator->removeLast();
expGen->decrementLevel();
if( child(1)->getOperatorType() == ITM_RANGE_SPEC_FUNC )
unGenerate(generator, child(1)->child(1));
else
unGenerate(generator, child(1));
generateMarkedEntries(generator, markedEntries);
return 0;
}