rsmith added a comment.
Making the `return ESR_Failed;` unconditional looks to be the correct change
here. We can't continue evaluation past that point because we don't know what
would be executed next. Unconditionally returning `ESR_Failed` in that
situation is what the other similar paths through `EvaluateStmt` do.
================
Comment at: clang/lib/AST/ExprConstant.cpp:4914
static bool EvaluateDependentExpr(const Expr *E, EvalInfo &Info) {
assert(E->isValueDependent());
----------------
I don't think the changes to this function are appropriate, because:
1) The special-casing of `RecoveryExpr` doesn't seem like it can be correct.
There's no guarantee that we get a `RecoveryExpr` any time we encounter an
expression that contains errors; error-dependence can be propagated from other
places, such as types.
2) For other error-dependent expressions, we also can't necessarily compute a
value.
3) It's not the responsibility of this function to deal with the situation
where a value is needed and can't be produced -- the responsibility to handle
that lies with the caller of this function instead. Eg, look at the handling of
`ReturnStmt` or `DoStmt`.
So I think we should undo all the changes in this function, and only fix
`SwitchStmt` to properly handle a value-dependent condition.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D153296/new/
https://reviews.llvm.org/D153296
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