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Author SHA1 Message Date
Corentin Jabot c68baa73eb [clang] Fix incorrect constant folding of `if consteval` 
Fixes https://github.com/llvm/llvm-project/issues/55638.

`if consteval` was evaluated incorrectly when in a
non-constant context that could be constant-folded.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D130437
 2022-07-24 16:18:12 +02:00
Corentin Jabot 424733c12a Implement if consteval (P1938) 
Modify the IfStmt node to suppoort constant evaluated expressions.

Add a new ExpressionEvaluationContext::ImmediateFunctionContext to
keep track of immediate function contexts.

This proved easier/better/probably more efficient than walking the AST
backward as it allows diagnosing nested if consteval statements.
 2021-10-05 08:04:14 -04:00