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[Constraint system] Look for parent/depth info in base constraint system.

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Look first in the base constraint system for this information, so it
only gets built once in the normal case.
This commit is contained in:
Doug Gregor
2019-11-14 20:35:07 -08:00
parent 24b47b5673
commit abf41e73a8
1 changed files with 6 additions and 3 deletions
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9
lib/Sema/ConstraintSystem.cpp
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@@ -528,6 +528,12 @@ static void extendDepthMap(
Optional<std::pair<unsigned, Expr *>> ConstraintSystem::getExprDepthAndParent(
Expr *expr) {
// Check whether the parent has this information.
if (baseCS && baseCS != this) {
if (auto known = baseCS->getExprDepthAndParent(expr))
return *known;
}
// Bring the set of expression weights up to date.
while (NumInputExprsInWeights < InputExprs.size()) {
extendDepthMap(InputExprs[NumInputExprsInWeights], ExprWeights);
@@ -538,9 +544,6 @@ Optional<std::pair<unsigned, Expr *>> ConstraintSystem::getExprDepthAndParent(
if (e != ExprWeights.end())
return e->second;
if (baseCS && baseCS != this)
return baseCS->getExprDepthAndParent(expr);
return None;
}