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Auto merge of #74949 - oli-obk:validate_const_eval_raw, r=RalfJung

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Validate constants during `const_eval_raw`

This PR implements the groundwork for https://github.com/rust-lang/rust/issues/72396

* constants are now validated during `const_eval_raw`
* to prevent cycle errors, we do not validate references to statics anymore beyond the fact that they are not dangling
* the `const_eval` query ICEs if used on `static` items
* as a side effect promoteds are now evaluated to `ConstValue::Scalar` again (since they are just a reference to the actual promoted allocation in most cases).
This commit is contained in:
bors 2020-09-20 08:58:32 +00:00
commit 5e449b9adf
52 changed files with 347 additions and 420 deletions
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4
compiler/rustc_mir/src/lib.rs
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@ -53,8 +53,8 @@ pub fn provide(providers: &mut Providers) {
transform::provide(providers);
monomorphize::partitioning::provide(providers);
monomorphize::polymorphize::provide(providers);
providers.const_eval_validated = const_eval::const_eval_validated_provider;
providers.const_eval_raw = const_eval::const_eval_raw_provider;
providers.eval_to_const_value_raw = const_eval::eval_to_const_value_raw_provider;
providers.eval_to_allocation_raw = const_eval::eval_to_allocation_raw_provider;
providers.const_caller_location = const_eval::const_caller_location;
providers.destructure_const = |tcx, param_env_and_value| {
let (param_env, value) = param_env_and_value.into_parts();