bors e9f29a8519 Auto merge of #89030 - nbdd0121:box2, r=jonas-schievink ... Introduce `Rvalue::ShallowInitBox` Polished version of #88700. Implements MCP rust-lang/compiler-team#460, and should allow #43596 to go forward. In short, creating an empty box is split from a nullary-op `NullOp::Box` into two steps, first a call to `exchange_malloc`, then a `Rvalue::ShallowInitBox` which transmutes `*mut u8` to a shallow-initialized `Box<T>`. This allows the `exchange_malloc` call to unwind. Details can be found in the MCP. `NullOp::Box` is not yet removed, purely to make reverting easier in case anything goes wrong as the result of this PR. If revert is needed a reversion of "Use Rvalue::ShallowInitBox for box expression" commit followed by a test bless should be sufficient. Experiments in #88700 showed a very slight compile-time perf regression due to (supposedly) slightly more time spent in LLVM. We could omit unwind edge generation (in non-`oom=panic` case) in box expression MIR construction to restore perf; but I don't think it's necessary since runtime perf isn't affected and perf difference is rather small.		2021-09-25 11:01:13 +00:00
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coverage	Migrate to 2021	2021-09-20 22:21:42 -04:00
inline	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
abort_unwinding_calls.rs	Treat drop_in_place as nounwind with -Z panic-in-drop=abort	2021-09-10 14:18:15 +01:00
add_call_guards.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
add_moves_for_packed_drops.rs	Move the dataflow framework to its own crate.	2021-09-07 19:57:07 +02:00
add_retag.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
check_const_item_mutation.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
check_packed_ref.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
check_unsafety.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
cleanup_post_borrowck.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
const_debuginfo.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
const_goto.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
const_prop.rs	Introduce Rvalue::ShallowInitBox	2021-09-25 01:08:41 +01:00
deaggregator.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
deduplicate_blocks.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
dest_prop.rs	Introduce Rvalue::ShallowInitBox	2021-09-25 01:08:41 +01:00
dump_mir.rs	Move the dataflow framework to its own crate.	2021-09-07 19:57:07 +02:00
early_otherwise_branch.rs	Move the dataflow framework to its own crate.	2021-09-07 19:57:07 +02:00
elaborate_drops.rs	Move the dataflow framework to its own crate.	2021-09-07 19:57:07 +02:00
function_item_references.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
generator.rs	Move the dataflow framework to its own crate.	2021-09-07 19:57:07 +02:00
inline.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
instcombine.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
lib.rs	Make rustc_mir_dataflow::framework::graphviz and rustc_mir_transform::MirPass public	2021-09-15 11:41:37 -07:00
lower_intrinsics.rs	Introduce NullOp::AlignOf	2021-09-13 00:08:35 +01:00
lower_slice_len.rs	don't clone types that are Copy (clippy::clone_on_copy)	2021-09-11 10:18:56 +02:00
match_branches.rs	Rename rustc_mir to rustc_const_eval.	2021-09-07 20:46:26 +02:00
multiple_return_terminators.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
nrvo.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
remove_noop_landing_pads.rs	Move the dataflow framework to its own crate.	2021-09-07 19:57:07 +02:00
remove_storage_markers.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
remove_unneeded_drops.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
remove_zsts.rs	Disable RemoveZsts in generators to avoid query cycles	2021-09-15 18:48:29 +02:00
required_consts.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
separate_const_switch.rs	Introduce Rvalue::ShallowInitBox	2021-09-25 01:08:41 +01:00
shim.rs	Support #[track_caller] on closures and generators	2021-09-22 15:19:33 -05:00
simplify.rs	Do not collapse goto chains beginning with the start block	2021-09-18 07:28:55 +02:00
simplify_branches.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
simplify_comparison_integral.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
simplify_try.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
uninhabited_enum_branching.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00
unreachable_prop.rs	Move rustc_mir::transform to rustc_mir_transform.	2021-09-07 00:43:14 +02:00