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Avoid symbolic witnesses for .Self in an impl decl (#7564)

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Point symbolic witnesses into `.Self` written inside an impl decl at the
impl that is being declared. This is tricky because the impl does not
yet exist. So we use a new instruction `ImplSelfWitness` which _will_ be
replaced by the `ImplWitness` once it becomes available. The
`ImplSelfWitness` acts like a symbolic witness, except it does not
perform lookup, since we know which impl we will get a witness from.

This prevents us from finding other impls when performing lookups into
`.Self` in an impl decl, which produces incorrect/incoherent results.
This commit is contained in:
Dana Jansens
2026-07-29 16:25:23 +00:00
committed by GitHub
parent 2ac425e591
commit f51c075f8b
94 changed files with 3221 additions and 2797 deletions
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toolchain/check/testdata/array/bound_values.carbon
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+4 -4
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@@ -75,8 +75,8 @@ var b: array(1, 39999999999999999993);
// CHECK:STDOUT: %AddWith.type.832: type = facet_type <@AddWith, @AddWith(Core.IntLiteral)> [concrete]
// CHECK:STDOUT: %AddWith.impl_witness: <witness> = impl_witness imports.%AddWith.impl_witness_table [concrete]
// CHECK:STDOUT: %AddWith.facet: %AddWith.type.832 = facet_value Core.IntLiteral, (%AddWith.impl_witness) [concrete]
// CHECK:STDOUT: %AddWith.WithSelf.Op.type.af6: type = fn_type @AddWith.WithSelf.Op, @AddWith.WithSelf(Core.IntLiteral, %AddWith.facet) [concrete]
// CHECK:STDOUT: %.eb6: type = fn_type_with_self_type %AddWith.WithSelf.Op.type.af6, %AddWith.facet [concrete]
// CHECK:STDOUT: %AddWith.WithSelf.Op.type.8da: type = fn_type @AddWith.WithSelf.Op, @AddWith.WithSelf(Core.IntLiteral, %AddWith.facet) [concrete]
// CHECK:STDOUT: %.cef: type = fn_type_with_self_type %AddWith.WithSelf.Op.type.8da, %AddWith.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.AddWith.impl.Op.type: type = fn_type @Core.IntLiteral.as.AddWith.impl.Op [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.AddWith.impl.Op: %Core.IntLiteral.as.AddWith.impl.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.AddWith.impl.Op.bound: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.AddWith.impl.Op [concrete]
@@ -87,7 +87,7 @@ var b: array(1, 39999999999999999993);
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.abd = import_ref Core//prelude/operators/arithmetic, loc{{\d+_\d+}}, unloaded
// CHECK:STDOUT: %Core.import_ref.9c3: %Core.IntLiteral.as.AddWith.impl.Op.type = import_ref Core//prelude/operators/arithmetic, loc{{\d+_\d+}}, loaded [concrete = constants.%Core.IntLiteral.as.AddWith.impl.Op]
// CHECK:STDOUT: %AddWith.impl_witness_table = impl_witness_table (%Core.import_ref.abd, %Core.import_ref.9c3), @Core.IntLiteral.as.AddWith.impl.83c [concrete]
// CHECK:STDOUT: %AddWith.impl_witness_table = impl_witness_table (%Core.import_ref.abd, %Core.import_ref.9c3), @Core.IntLiteral.as.AddWith.impl.8f4 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
@@ -95,7 +95,7 @@ var b: array(1, 39999999999999999993);
// CHECK:STDOUT: %i32.loc6: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
// CHECK:STDOUT: %impl.elem1: %.eb6 = impl_witness_access constants.%AddWith.impl_witness, element1 [concrete = constants.%Core.IntLiteral.as.AddWith.impl.Op]
// CHECK:STDOUT: %impl.elem1: %.cef = impl_witness_access constants.%AddWith.impl_witness, element1 [concrete = constants.%Core.IntLiteral.as.AddWith.impl.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_1, %impl.elem1 [concrete = constants.%Core.IntLiteral.as.AddWith.impl.Op.bound]
// CHECK:STDOUT: %Core.IntLiteral.as.AddWith.impl.Op.call: init Core.IntLiteral = call %bound_method(%int_1, %int_2) [concrete = constants.%int_3.1ba]
// CHECK:STDOUT: %.loc6_18.1: Core.IntLiteral = value_of_initializer %Core.IntLiteral.as.AddWith.impl.Op.call [concrete = constants.%int_3.1ba]