rsmith added inline comments.
================
Comment at: lib/AST/ExprConstant.cpp:576
+ typedef std::pair<APValue::LValueBase, unsigned> EvaluatingObject;
+
----------------
Please add a comment explaining what the two fields mean.
================
Comment at: lib/AST/ExprConstant.cpp:588
+ : EI(EI), Object(Object) {
+ DidInsert = EI.EvaluatingConstructors.insert(Object).second;
+ }
----------------
Can the `DidInsert == false` case actually happen?
================
Comment at: lib/AST/ExprConstant.cpp:596
+ bool isEvaluatingConstructor(APValue::LValueBase Decl, unsigned CallIndex)
{
+ return Decl == EvaluatingDecl ||
+ EvaluatingConstructors.count(EvaluatingObject(Decl, CallIndex));
----------------
Hmm, should we check the `CallIndex` is 0 in this case? I think we technically
don't need to, but only because we happen to only evaluate the initializer of
local variables before the enclosing function has its body attached.
Perhaps we could insert `EvaluatingDecl` into the `EvaluatingConstructors` list
and simplify this check to just the `DenseSet` lookup?
https://reviews.llvm.org/D38483
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