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bors 2753fab7ce Auto merge of #73879 - ecstatic-morse:discr-switch-uninit, r=oli-obk 
Handle inactive enum variants in `MaybeUninitializedPlaces`

Resolves the first part of #69715.

This is the equivalent of #68528 but for `MaybeUninitializedPlaces`. Because we now notify drop elaboration that inactive enum variants might be uninitialized, some drops get marked as ["open" that were previously "static"](e0e5d82e16/src/librustc_mir/transform/elaborate_drops.rs (L191)). Unlike in #69715, this isn't strictly better: An "open" drop expands to more MIR than a simple call to the drop shim. However, because drop elaboration considers each field of an "open" drop separately, it can sometimes eliminate unnecessary drops of moved-from or unit-like enum variants. This is the case for `Option::unwrap`, which is reflected in the `mir-opt` test.

cc @eddyb
r? @oli-obk
2020-07-05 18:01:47 +00:00
..
address-of Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
array-index-is-temporary Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
basic_assignment Revert "Bless mir-opt tests" 2020-06-04 11:29:10 -04:00
box_expr Revert "Bless mir-opt tests" 2020-06-04 11:29:10 -04:00
byte_slice Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
combine_array_len Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
const-promotion-extern-static Revert "Bless mir-opt tests" 2020-06-04 11:29:10 -04:00
const_allocation Pointer printing: do not print 0 offset 2020-05-12 13:30:50 +02:00
const_allocation2 Pointer printing: do not print 0 offset 2020-05-12 13:30:50 +02:00
const_allocation3 Pointer printing: do not print 0 offset 2020-05-12 13:30:50 +02:00
const_prop Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
const_prop_miscompile Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
copy_propagation Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
copy_propagation_arg Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
deaggregator_test Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
deaggregator_test_enum Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
deaggregator_test_enum_2 Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
deaggregator_test_multiple Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
exponential-or Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
fn-ptr-shim Add test 2020-06-15 20:54:40 +02:00
generator-drop-cleanup Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
generator-storage-dead-unwind Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
generator-tiny Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
graphviz Revert "Bless mir-opt tests" 2020-06-04 11:29:10 -04:00
inline Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
instrument_coverage add spans to injected coverage counters 2020-06-29 12:31:25 -07:00
issue-38669 rename FalseEdges -> FalseEdge 2020-06-07 10:12:21 +02:00
issue-41110 Revert "Bless mir-opt tests" 2020-06-04 11:29:10 -04:00
issue-41697 Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
issue-41888 Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
issue-49232 Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
issue-62289 Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
issue-72181 Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
issue-72181-1 pretty/mir: const value enums with no variants 2020-06-19 14:46:01 +01:00
issue-73223 [mir-opt] Prevent mis-optimization when SimplifyArmIdentity runs 2020-07-02 21:02:57 -04:00
loop_test Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
match-arm-scopes Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
match_false_edges Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
match_test Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
nll rename FalseEdges -> FalseEdge 2020-06-07 10:12:21 +02:00
no-drop-for-inactive-variant Bless mir-opt tests 2020-06-30 11:31:00 -07:00
no-spurious-drop-after-call Revert "Bless mir-opt tests" 2020-06-04 11:29:10 -04:00
nrvo-simple Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
packed-struct-drop-aligned Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
remove-never-const Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
remove_fake_borrows Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
retag Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
simple-match Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
simplify-arm Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
simplify-arm-identity Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
simplify-locals-fixedpoint Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
simplify-locals-removes-unused-consts Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
simplify-locals-removes-unused-discriminant-reads Auto merge of #73879 - ecstatic-morse:discr-switch-uninit, r=oli-obk 2020-07-05 18:01:47 +00:00
simplify_cfg rename FalseEdges -> FalseEdge 2020-06-07 10:12:21 +02:00
simplify_if Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
simplify_match Changed simplify_match output query because it had become outdated 2020-04-28 00:53:48 -04:00
simplify_try Fix debuginfo so that it points to the correct local 2020-07-02 21:11:14 -04:00
simplify_try_if_let Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
slice-drop-shim Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
storage_live_dead_in_statics Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
storage_ranges Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
tls-access Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
uniform_array_move_out Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
uninhabited-enum Emit basic block ids for statements and terminators in MIR only in -Zverbose mode 2020-04-27 15:16:12 +02:00
uninhabited_enum_branching Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
unreachable Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
unreachable_asm Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
unreachable_asm_2 Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
unreachable_diverging Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
unusual-item-types Show the values and computation that would overflow a const evaluation or propagation 2020-06-26 10:08:52 +02:00
while-storage Revert "Bless mir-opt tests" 2020-06-04 11:29:10 -04:00
address-of.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
array-index-is-temporary.rs Add EMIT_MIR_FOR_EACH_BIT_WIDTH to tests that need it. 2020-04-07 17:49:14 +00:00
basic_assignment.rs Enable --blessing of MIR dumps 2020-03-26 15:26:33 +01:00
box_expr.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
byte_slice.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
combine_array_len.rs Add EMIT_MIR_FOR_EACH_BIT_WIDTH to tests that need it. 2020-04-07 17:49:14 +00:00
const-promotion-extern-static.rs Enable --blessing of MIR dumps 2020-03-26 15:26:33 +01:00
const_allocation.rs Enable --blessing of MIR dumps 2020-03-26 15:26:33 +01:00
const_allocation2.rs Enable --blessing of MIR dumps 2020-03-26 15:26:33 +01:00
const_allocation3.rs Enable --blessing of MIR dumps 2020-03-26 15:26:33 +01:00
const_prop_miscompile.rs The const propagator cannot trace references. 2020-06-23 10:18:14 +02:00
copy_propagation.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
copy_propagation_arg.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
deaggregator_test.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
deaggregator_test_enum.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
deaggregator_test_enum_2.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
deaggregator_test_multiple.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
exponential-or.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
fn-ptr-shim.rs Add test 2020-06-15 20:54:40 +02:00
generator-drop-cleanup.rs Ignore generator-drop-cleanup on wasm32-bare 2020-04-17 20:37:34 +02:00
generator-storage-dead-unwind.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
generator-tiny.rs Fix test 2020-04-29 01:21:24 +01:00
graphviz.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
instrument_coverage.rs Ensure profiling runtime for -Zinstrument-coverage 2020-06-16 18:48:46 -07:00
issue-38669.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
issue-41110.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
issue-41697.rs Add EMIT_MIR_FOR_EACH_BIT_WIDTH to tests that need it. 2020-04-07 17:49:14 +00:00
issue-41888.rs Add ignore-wasm32-bare to mir-opt tests that need it. 2020-04-08 18:58:49 +00:00
issue-49232.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
issue-62289.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
issue-72181-1.rs pretty/mir: const value enums with no variants 2020-06-19 14:46:01 +01:00
issue-72181.rs pretty/mir: const value enums with no variants 2020-06-19 14:46:01 +01:00
issue-73223.rs Add test for simplify-try misoptimization 2020-07-02 20:54:13 -04:00
loop_test.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
match-arm-scopes.rs Add ignore-wasm32-bare to mir-opt tests that need it. 2020-04-08 18:58:49 +00:00
match_false_edges.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
match_test.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
no-drop-for-inactive-variant.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
no-spurious-drop-after-call.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
nrvo-simple.rs Add simple NRVO test 2020-05-16 17:15:24 -07:00
packed-struct-drop-aligned.rs Add EMIT_MIR_FOR_EACH_BIT_WIDTH to tests that need it. 2020-04-07 17:49:14 +00:00
README.md Remove old mir-opt test format. 2020-04-07 18:02:11 +00:00
remove-never-const.rs Adjust name of never typed const test 2020-04-23 18:07:36 -03:00
remove_fake_borrows.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
retag.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
return_an_array.rs Remove licenses 2018-12-25 21:08:33 -07:00
simple-match.rs Add EMIT_MIR_FOR_EACH_BIT_WIDTH to tests that need it. 2020-04-07 17:49:14 +00:00
simplify-arm-identity.rs Allow Locals to be propagated into and from, but restricted to their own block 2020-04-28 00:44:50 -04:00
simplify-arm.rs Modify SimplifyArmIdentity so it can trigger on mir-opt-level=1 2020-05-11 20:31:02 -04:00
simplify-locals-fixedpoint.rs Add test case 2020-04-15 14:34:23 -04:00
simplify-locals-removes-unused-consts.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
simplify-locals-removes-unused-discriminant-reads.rs Add EMIR_MIR_FOR_EACH_BIT_WIDTH to failing test 2020-06-15 21:09:49 -04:00
simplify_cfg.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
simplify_if.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
simplify_match.rs Changed simplify_match output query because it had become outdated 2020-04-28 00:53:48 -04:00
simplify_try.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
simplify_try_if_let.rs Modify SimplifyArmIdentity so it can trigger on mir-opt-level=1 2020-05-11 20:31:02 -04:00
slice-drop-shim.rs Add EMIT_MIR_FOR_EACH_BIT_WIDTH to tests that need it. 2020-04-07 17:49:14 +00:00
storage_live_dead_in_statics.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
storage_ranges.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
tls-access.rs Make TLS accesses explicit in MIR 2020-05-30 12:59:05 +02:00
uniform_array_move_out.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
uninhabited-enum.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
uninhabited_enum_branching.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
unreachable.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
unreachable_asm.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
unreachable_asm_2.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
unreachable_diverging.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00
unusual-item-types.rs Add EMIT_MIR_FOR_EACH_BIT_WIDTH to tests that need it. 2020-04-07 17:49:14 +00:00
while-storage.rs --bless all mir-opt tests. 2020-04-07 15:09:01 +00:00

README.md

This folder contains tests for MIR optimizations.

The mir-opt test format emits MIR to extra files that you can automatically update by specifying --bless on the command line (just like ui tests updating .stderr files).

--blessable test format

By default 32 bit and 64 bit targets use the same dump files, which can be problematic in the presence of pointers in constants or other bit width dependent things. In that case you can add

// EMIT_MIR_FOR_EACH_BIT_WIDTH

to your test, causing separate files to be generated for 32bit and 64bit systems.

Emit a diff of the mir for a specific optimization

This is what you want most often when you want to see how an optimization changes the MIR.

// EMIT_MIR $file_name_of_some_mir_dump.diff

Emit mir after a specific optimization

Use this if you are just interested in the final state after an optimization.

// EMIT_MIR $file_name_of_some_mir_dump.after.mir

Emit mir before a specific optimization

This exists mainly for completeness and is rarely useful.

// EMIT_MIR $file_name_of_some_mir_dump.before.mir