carbon-language/carbon-lang
1
0
Fork 0
mirror of https://github.com/carbon-language/carbon-lang.git synced 2026-09-28 22:02:37 +01:00
Code Issues Packages Projects Releases 10 Wiki Activity
Files
53ea894d0d653bcc8efcbb41fd312f2ceb7b9d13
carbon-lang/toolchain/check/testdata/function/generic/deduce_nested_facet_value.carbon
T
Dana Jansens e682a6660d Avoid adding extraneous local instructions while importing witness table entries (#6180) 
When deducing arguments for generic parameters of an `impl`, the
deduction calls `Convert` on the input arguments. Often, the input
argument is a facet, and needs to be converted to a type via
FacetAccessType in order to produce a different facet. These
instructions end up being added to the semir, but only their constant
values are needed for the resulting specific returned from Deduce.

In the best case, these extra instructions are just noise in the semir,
or they just cause instruction names to get differentiated with larger
suffixes.

In the worst case, these extra instructions contain references to
instructions from a generic context, and leak them out of that generic
context and into another. In particular, when importing a
LookupImplWitness instruction, the re-evaluation of it can do deduce
(when the lookup is against a generic `impl`). The instructions created
in Deduce are not part of the import, and end up referring to imported
instructions from the local context, which leads to confusion in the
toolchain, and can crash.

The `import_self_specific.carbon` test demonstrates this. It causes the
`I.F` function to be imported from the `I` interface when building the
witness table for the `impl`. Doing so imports the specific of `C` which
includes a LookupImplWitness for `Self.Accoc` in `I`. The `Self` is a
BindSymbolicName with generic binding index 0, in `I`. When Convert
creates instructions in the generic `impl forall D`, however, they end
up referencing and including this BindSymbolicName into its eval block.
But the generic binding 0 in the `impl` is a very different thing (a
value of type `E`). This confusion leads to crashes.
2025-10-09 16:07:30 +00:00

279 lines
16 KiB
Plaintext
Raw Blame History

// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/function/generic/deduce_nested_facet_value.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/generic/deduce_nested_facet_value.carbon
// --- deduce_nested_facet_value.carbon
library "[[@TEST_NAME]]";
interface Y {}
interface W {}
// DD implements both Y and W.
class DD {}
impl DD as Y {}
impl DD as W {}
// CC requires D to implement Y.
class CC(D:! Y) {}
interface Z {}
// The `D` interface provides `Y` but not `W`, so we need to see that the
// parameter to `CC` is `DD` which provides `Y & W`, not just a FacetValue
// abstractly providing `Y.
impl forall [E:! Y & W] CC(E) as Z {}
fn F() {
(CC(DD)) as Z;
}
// CHECK:STDOUT: --- deduce_nested_facet_value.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Y.type: type = facet_type <@Y> [concrete]
// CHECK:STDOUT: %Self.045: %Y.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %W.type: type = facet_type <@W> [concrete]
// CHECK:STDOUT: %Self.7b5: %W.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %DD: type = class_type @DD [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %Y.impl_witness: <witness> = impl_witness file.%Y.impl_witness_table [concrete]
// CHECK:STDOUT: %W.impl_witness: <witness> = impl_witness file.%W.impl_witness_table [concrete]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = bind_symbolic_name .Self [symbolic_self]
// CHECK:STDOUT: %D: %Y.type = bind_symbolic_name D, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.6e5: type = pattern_type %Y.type [concrete]
// CHECK:STDOUT: %CC.type: type = generic_class_type @CC [concrete]
// CHECK:STDOUT: %CC.generic: %CC.type = struct_value () [concrete]
// CHECK:STDOUT: %CC.ef8: type = class_type @CC, @CC(%D) [symbolic]
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %Self.1d7: %Z.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %BitAndWith.type.f2e: type = generic_interface_type @BitAndWith [concrete]
// CHECK:STDOUT: %BitAndWith.generic: %BitAndWith.type.f2e = struct_value () [concrete]
// CHECK:STDOUT: %BitAndWith.type.8a6: type = facet_type <@BitAndWith, @BitAndWith(type)> [concrete]
// CHECK:STDOUT: %BitAndWith.Op.type.9a3: type = fn_type @BitAndWith.Op, @BitAndWith(type) [concrete]
// CHECK:STDOUT: %BitAndWith.impl_witness: <witness> = impl_witness imports.%BitAndWith.impl_witness_table [concrete]
// CHECK:STDOUT: %BitAndWith.facet: %BitAndWith.type.8a6 = facet_value type, (%BitAndWith.impl_witness) [concrete]
// CHECK:STDOUT: %.fa7: type = fn_type_with_self_type %BitAndWith.Op.type.9a3, %BitAndWith.facet [concrete]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op.type: type = fn_type @type.as.BitAndWith.impl.Op [concrete]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op: %type.as.BitAndWith.impl.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op.bound: <bound method> = bound_method %Y.type, %type.as.BitAndWith.impl.Op [concrete]
// CHECK:STDOUT: %facet_type: type = facet_type <@Y & @W> [concrete]
// CHECK:STDOUT: %E: %facet_type = bind_symbolic_name E, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.50c: type = pattern_type %facet_type [concrete]
// CHECK:STDOUT: %E.binding.as_type: type = symbolic_binding_type E, 0, %E [symbolic]
// CHECK:STDOUT: %Y.lookup_impl_witness: <witness> = lookup_impl_witness %E, @Y [symbolic]
// CHECK:STDOUT: %Y.facet.8d8: %Y.type = facet_value %E.binding.as_type, (%Y.lookup_impl_witness) [symbolic]
// CHECK:STDOUT: %CC.f67: type = class_type @CC, @CC(%Y.facet.8d8) [symbolic]
// CHECK:STDOUT: %Z.impl_witness.62d: <witness> = impl_witness file.%Z.impl_witness_table, @CC.as.Z.impl(%E) [symbolic]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %Y.facet.4e8: %Y.type = facet_value %DD, (%Y.impl_witness) [concrete]
// CHECK:STDOUT: %CC.3b3: type = class_type @CC, @CC(%Y.facet.4e8) [concrete]
// CHECK:STDOUT: %facet_value: %facet_type = facet_value %DD, (%Y.impl_witness, %W.impl_witness) [concrete]
// CHECK:STDOUT: %Z.impl_witness.23f: <witness> = impl_witness file.%Z.impl_witness_table, @CC.as.Z.impl(%facet_value) [concrete]
// CHECK:STDOUT: %Z.facet: %Z.type = facet_value %CC.3b3, (%Z.impl_witness.23f) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .BitAndWith = %Core.BitAndWith
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.BitAndWith: %BitAndWith.type.f2e = import_ref Core//prelude/parts/as, BitAndWith, loaded [concrete = constants.%BitAndWith.generic]
// CHECK:STDOUT: %Core.import_ref.636: %type.as.BitAndWith.impl.Op.type = import_ref Core//prelude/parts/as, loc{{\d+_\d+}}, loaded [concrete = constants.%type.as.BitAndWith.impl.Op]
// CHECK:STDOUT: %BitAndWith.impl_witness_table = impl_witness_table (%Core.import_ref.636), @type.as.BitAndWith.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Y = %Y.decl
// CHECK:STDOUT: .W = %W.decl
// CHECK:STDOUT: .DD = %DD.decl
// CHECK:STDOUT: .CC = %CC.decl
// CHECK:STDOUT: .Z = %Z.decl
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Y.decl: type = interface_decl @Y [concrete = constants.%Y.type] {} {}
// CHECK:STDOUT: %W.decl: type = interface_decl @W [concrete = constants.%W.type] {} {}
// CHECK:STDOUT: %DD.decl: type = class_decl @DD [concrete = constants.%DD] {} {}
// CHECK:STDOUT: impl_decl @DD.as.Y.impl [concrete] {} {
// CHECK:STDOUT: %DD.ref: type = name_ref DD, file.%DD.decl [concrete = constants.%DD]
// CHECK:STDOUT: %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Y.impl_witness_table = impl_witness_table (), @DD.as.Y.impl [concrete]
// CHECK:STDOUT: %Y.impl_witness: <witness> = impl_witness %Y.impl_witness_table [concrete = constants.%Y.impl_witness]
// CHECK:STDOUT: impl_decl @DD.as.W.impl [concrete] {} {
// CHECK:STDOUT: %DD.ref: type = name_ref DD, file.%DD.decl [concrete = constants.%DD]
// CHECK:STDOUT: %W.ref: type = name_ref W, file.%W.decl [concrete = constants.%W.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %W.impl_witness_table = impl_witness_table (), @DD.as.W.impl [concrete]
// CHECK:STDOUT: %W.impl_witness: <witness> = impl_witness %W.impl_witness_table [concrete = constants.%W.impl_witness]
// CHECK:STDOUT: %CC.decl: %CC.type = class_decl @CC [concrete = constants.%CC.generic] {
// CHECK:STDOUT: %D.patt: %pattern_type.6e5 = symbolic_binding_pattern D, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc12: type = splice_block %Y.ref [concrete = constants.%Y.type] {
// CHECK:STDOUT: %.Self: %type = bind_symbolic_name .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %D.loc12_10.2: %Y.type = bind_symbolic_name D, 0 [symbolic = %D.loc12_10.1 (constants.%D)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Z.decl: type = interface_decl @Z [concrete = constants.%Z.type] {} {}
// CHECK:STDOUT: impl_decl @CC.as.Z.impl [concrete] {
// CHECK:STDOUT: %E.patt: %pattern_type.50c = symbolic_binding_pattern E, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %CC.ref: %CC.type = name_ref CC, file.%CC.decl [concrete = constants.%CC.generic]
// CHECK:STDOUT: %E.ref: %facet_type = name_ref E, %E.loc19_14.1 [symbolic = %E.loc19_14.2 (constants.%E)]
// CHECK:STDOUT: %E.as_type: type = facet_access_type %E.ref [symbolic = %E.binding.as_type (constants.%E.binding.as_type)]
// CHECK:STDOUT: %Y.facet.loc19_29.1: %Y.type = facet_value %E.as_type, (constants.%Y.lookup_impl_witness) [symbolic = %Y.facet.loc19_29.2 (constants.%Y.facet.8d8)]
// CHECK:STDOUT: %.loc19_29: %Y.type = converted %E.ref, %Y.facet.loc19_29.1 [symbolic = %Y.facet.loc19_29.2 (constants.%Y.facet.8d8)]
// CHECK:STDOUT: %CC.loc19_29.1: type = class_type @CC, @CC(constants.%Y.facet.8d8) [symbolic = %CC.loc19_29.2 (constants.%CC.f67)]
// CHECK:STDOUT: %Z.ref: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: %.loc19_20.1: type = splice_block %.loc19_20.3 [concrete = constants.%facet_type] {
// CHECK:STDOUT: %.Self: %type = bind_symbolic_name .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %Y.ref: type = name_ref Y, file.%Y.decl [concrete = constants.%Y.type]
// CHECK:STDOUT: %W.ref: type = name_ref W, file.%W.decl [concrete = constants.%W.type]
// CHECK:STDOUT: %impl.elem0: %.fa7 = impl_witness_access constants.%BitAndWith.impl_witness, element0 [concrete = constants.%type.as.BitAndWith.impl.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %Y.ref, %impl.elem0 [concrete = constants.%type.as.BitAndWith.impl.Op.bound]
// CHECK:STDOUT: %type.as.BitAndWith.impl.Op.call: init type = call %bound_method(%Y.ref, %W.ref) [concrete = constants.%facet_type]
// CHECK:STDOUT: %.loc19_20.2: type = value_of_initializer %type.as.BitAndWith.impl.Op.call [concrete = constants.%facet_type]
// CHECK:STDOUT: %.loc19_20.3: type = converted %type.as.BitAndWith.impl.Op.call, %.loc19_20.2 [concrete = constants.%facet_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %E.loc19_14.1: %facet_type = bind_symbolic_name E, 0 [symbolic = %E.loc19_14.2 (constants.%E)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Z.impl_witness_table = impl_witness_table (), @CC.as.Z.impl [concrete]
// CHECK:STDOUT: %Z.impl_witness: <witness> = impl_witness %Z.impl_witness_table, @CC.as.Z.impl(constants.%E) [symbolic = @CC.as.Z.impl.%Z.impl_witness (constants.%Z.impl_witness.62d)]
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Y {
// CHECK:STDOUT: %Self: %Y.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self.045]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @W {
// CHECK:STDOUT: %Self: %W.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self.7b5]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Z {
// CHECK:STDOUT: %Self: %Z.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self.1d7]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @DD.as.Y.impl: %DD.ref as %Y.ref {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: witness = file.%Y.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @DD.as.W.impl: %DD.ref as %W.ref {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: witness = file.%W.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic impl @CC.as.Z.impl(%E.loc19_14.1: %facet_type) {
// CHECK:STDOUT: %E.loc19_14.2: %facet_type = bind_symbolic_name E, 0 [symbolic = %E.loc19_14.2 (constants.%E)]
// CHECK:STDOUT: %E.binding.as_type: type = symbolic_binding_type E, 0, %E.loc19_14.2 [symbolic = %E.binding.as_type (constants.%E.binding.as_type)]
// CHECK:STDOUT: %Y.lookup_impl_witness: <witness> = lookup_impl_witness %E.loc19_14.2, @Y [symbolic = %Y.lookup_impl_witness (constants.%Y.lookup_impl_witness)]
// CHECK:STDOUT: %Y.facet.loc19_29.2: %Y.type = facet_value %E.binding.as_type, (%Y.lookup_impl_witness) [symbolic = %Y.facet.loc19_29.2 (constants.%Y.facet.8d8)]
// CHECK:STDOUT: %CC.loc19_29.2: type = class_type @CC, @CC(%Y.facet.loc19_29.2) [symbolic = %CC.loc19_29.2 (constants.%CC.f67)]
// CHECK:STDOUT: %Z.impl_witness: <witness> = impl_witness file.%Z.impl_witness_table, @CC.as.Z.impl(%E.loc19_14.2) [symbolic = %Z.impl_witness (constants.%Z.impl_witness.62d)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:
// CHECK:STDOUT: impl: %CC.loc19_29.1 as %Z.ref {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: witness = file.%Z.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @DD {
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%DD
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic class @CC(%D.loc12_10.2: %Y.type) {
// CHECK:STDOUT: %D.loc12_10.1: %Y.type = bind_symbolic_name D, 0 [symbolic = %D.loc12_10.1 (constants.%D)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:
// CHECK:STDOUT: class {
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%CC.ef8
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %CC.ref: %CC.type = name_ref CC, file.%CC.decl [concrete = constants.%CC.generic]
// CHECK:STDOUT: %DD.ref: type = name_ref DD, file.%DD.decl [concrete = constants.%DD]
// CHECK:STDOUT: %Y.facet: %Y.type = facet_value %DD.ref, (constants.%Y.impl_witness) [concrete = constants.%Y.facet.4e8]
// CHECK:STDOUT: %.loc22_9: %Y.type = converted %DD.ref, %Y.facet [concrete = constants.%Y.facet.4e8]
// CHECK:STDOUT: %CC: type = class_type @CC, @CC(constants.%Y.facet.4e8) [concrete = constants.%CC.3b3]
// CHECK:STDOUT: %Z.ref: type = name_ref Z, file.%Z.decl [concrete = constants.%Z.type]
// CHECK:STDOUT: %Z.facet: %Z.type = facet_value %CC, (constants.%Z.impl_witness.23f) [concrete = constants.%Z.facet]
// CHECK:STDOUT: %.loc22_12: %Z.type = converted %CC, %Z.facet [concrete = constants.%Z.facet]
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @CC(constants.%D) {
// CHECK:STDOUT: %D.loc12_10.1 => constants.%D
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @CC(constants.%Y.facet.8d8) {
// CHECK:STDOUT: %D.loc12_10.1 => constants.%Y.facet.8d8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @CC.as.Z.impl(constants.%E) {
// CHECK:STDOUT: %E.loc19_14.2 => constants.%E
// CHECK:STDOUT: %E.binding.as_type => constants.%E.binding.as_type
// CHECK:STDOUT: %Y.lookup_impl_witness => constants.%Y.lookup_impl_witness
// CHECK:STDOUT: %Y.facet.loc19_29.2 => constants.%Y.facet.8d8
// CHECK:STDOUT: %CC.loc19_29.2 => constants.%CC.f67
// CHECK:STDOUT: %Z.impl_witness => constants.%Z.impl_witness.62d
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @CC(constants.%Y.facet.4e8) {
// CHECK:STDOUT: %D.loc12_10.1 => constants.%Y.facet.4e8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @CC.as.Z.impl(constants.%facet_value) {
// CHECK:STDOUT: %E.loc19_14.2 => constants.%facet_value
// CHECK:STDOUT: %E.binding.as_type => constants.%DD
// CHECK:STDOUT: %Y.lookup_impl_witness => constants.%Y.impl_witness
// CHECK:STDOUT: %Y.facet.loc19_29.2 => constants.%Y.facet.4e8
// CHECK:STDOUT: %CC.loc19_29.2 => constants.%CC.3b3
// CHECK:STDOUT: %Z.impl_witness => constants.%Z.impl_witness.23f
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
Reference in New Issue View Git Blame Copy Permalink