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carbon-lang/toolchain/check/testdata/impl/lookup/transitive.carbon
T
Dana JansensandRichard Smith 0e8d354567 Split the witness table into a separate ImplWitnessTable instruction (#5272) 
This allows us to import the table for a given impl only once, while we
can import many ImplWitness instructions with different specifics for a
generic impl.

For example in convert_facet_value_to_narrowed_facet_type.carbon we see
that a single witness table is imported for the BitAnd interface, with
multiple witnesses (for different specifics) imported and sharing the
same table.

The ImplWitnessTable now contains a back-link to the Impl the witness is
for, allowing inst namer to name that interface in the textual semir,
and allowing the interface to be found when debugging from a witness.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2025-04-11 20:30:04 +00:00

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// 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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/lookup/transitive.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/lookup/transitive.carbon
// --- i.carbon
library "[[@TEST_NAME]]";
interface I { fn F[self: Self](); }
// --- c.carbon
library "[[@TEST_NAME]]";
import library "i";
class C {}
impl C as I { fn F[self: Self]() {} }
// --- get.carbon
library "[[@TEST_NAME]]";
import library "c";
fn Get() -> C;
// --- call.carbon
library "[[@TEST_NAME]]";
import library "get";
import library "i";
fn Call() {
// We find C in "get", but should look in "c" instead.
Get().(I.F)();
}
// CHECK:STDOUT: --- i.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%F.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %self.patt: @F.%Self.as_type.loc4_26.1 (%Self.as_type) = binding_pattern self
// CHECK:STDOUT: %self.param_patt: @F.%Self.as_type.loc4_26.1 (%Self.as_type) = value_param_pattern %self.patt, call_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: @F.%Self.as_type.loc4_26.1 (%Self.as_type) = value_param call_param0
// CHECK:STDOUT: %.loc4_26.1: type = splice_block %.loc4_26.2 [symbolic = %Self.as_type.loc4_26.1 (constants.%Self.as_type)] {
// CHECK:STDOUT: %Self.ref: %I.type = name_ref Self, @I.%Self [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc4_26.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc4_26.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %.loc4_26.2: type = converted %Self.ref, %Self.as_type.loc4_26.2 [symbolic = %Self.as_type.loc4_26.1 (constants.%Self.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @F.%Self.as_type.loc4_26.1 (%Self.as_type) = bind_name self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: witness = (%F.decl)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F(@I.%Self: %I.type) {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc4_26.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc4_26.1 (constants.%Self.as_type)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn[%self.param_patt: @F.%Self.as_type.loc4_26.1 (%Self.as_type)]();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.as_type.loc4_26.1 => constants.%Self.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- c.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %F.type.cf0: type = fn_type @F.1 [concrete]
// CHECK:STDOUT: %F.bc6: %F.type.cf0 = struct_value () [concrete]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness file.%I.impl_witness_table [concrete]
// CHECK:STDOUT: %F.type.5d6: type = fn_type @F.2 [concrete]
// CHECK:STDOUT: %F.a2e: %F.type.5d6 = struct_value () [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.I: type = import_ref Main//i, I, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.e5d = import_ref Main//i, inst19 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.507 = import_ref Main//i, loc4_33, unloaded
// CHECK:STDOUT: %Main.F: %F.type.cf0 = import_ref Main//i, F, loaded [concrete = constants.%F.bc6]
// CHECK:STDOUT: %Main.import_ref.5dd: %I.type = import_ref Main//i, inst19 [no loc], loaded [symbolic = constants.%Self]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .I = imports.%Main.I
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: impl_decl @impl [concrete] {} {
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %I.ref: type = name_ref I, imports.%Main.I [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (@impl.%F.decl), @impl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete = constants.%I.impl_witness]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I [from "i.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.e5d
// CHECK:STDOUT: .F = imports.%Main.import_ref.507
// CHECK:STDOUT: witness = (imports.%Main.F)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @impl: %C.ref as %I.ref {
// CHECK:STDOUT: %F.decl: %F.type.5d6 = fn_decl @F.2 [concrete = constants.%F.a2e] {
// CHECK:STDOUT: %self.patt: %C = binding_pattern self
// CHECK:STDOUT: %self.param_patt: %C = value_param_pattern %self.patt, call_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: %C = value_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, @impl.%C.ref [concrete = constants.%C]
// CHECK:STDOUT: %self: %C = bind_name self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: witness = file.%I.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F.1(imports.%Main.import_ref.5dd: %I.type) [from "i.carbon"] {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic = %Self.as_type (constants.%Self.as_type)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn[%self.param_patt: @F.1.%Self.as_type (%Self.as_type)]();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F.2[%self.param_patt: %C]() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.as_type => constants.%Self.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%I.facet) {
// CHECK:STDOUT: %Self => constants.%I.facet
// CHECK:STDOUT: %Self.as_type => constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- get.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %Get.type: type = fn_type @Get [concrete]
// CHECK:STDOUT: %Get: %Get.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.C: type = import_ref Main//c, C, loaded [concrete = constants.%C]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.8f2: <witness> = import_ref Main//c, loc6_10, loaded [concrete = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.2c4 = import_ref Main//c, inst20 [no loc], unloaded
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .C = imports.%Main.C
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Get = %Get.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %Get.decl: %Get.type = fn_decl @Get [concrete = constants.%Get] {
// CHECK:STDOUT: %return.patt: %C = return_slot_pattern
// CHECK:STDOUT: %return.param_patt: %C = out_param_pattern %return.patt, call_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %C.ref: type = name_ref C, imports.%Main.C [concrete = constants.%C]
// CHECK:STDOUT: %return.param: ref %C = out_param call_param0
// CHECK:STDOUT: %return: ref %C = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C [from "c.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.2c4
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Get() -> %C;
// CHECK:STDOUT:
// CHECK:STDOUT: --- call.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Call.type: type = fn_type @Call [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Call: %Call.type = struct_value () [concrete]
// CHECK:STDOUT: %Get.type: type = fn_type @Get [concrete]
// CHECK:STDOUT: %Get: %Get.type = struct_value () [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, imports.%Main.import_ref.e03 [concrete]
// CHECK:STDOUT: %F.type.cf0: type = fn_type @F.1 [concrete]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic]
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (imports.%Main.import_ref.742), @impl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: %.1b3: type = fn_type_with_self_type %F.type.cf0, %I.facet [concrete]
// CHECK:STDOUT: %F.type.5d6: type = fn_type @F.2 [concrete]
// CHECK:STDOUT: %F.a2e: %F.type.5d6 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.Get: %Get.type = import_ref Main//get, Get, loaded [concrete = constants.%Get]
// CHECK:STDOUT: %Main.I: type = import_ref Main//i, I, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.8db: <witness> = import_ref Main//get, inst23 [indirect], loaded [concrete = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.6a9 = import_ref Main//get, inst24 [indirect], unloaded
// CHECK:STDOUT: %Main.import_ref.e5d = import_ref Main//i, inst19 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.c44: %I.assoc_type = import_ref Main//i, loc4_33, loaded [concrete = constants.%assoc0]
// CHECK:STDOUT: %Main.F = import_ref Main//i, F, unloaded
// CHECK:STDOUT: %Main.import_ref.5dd: %I.type = import_ref Main//i, inst19 [no loc], loaded [symbolic = constants.%Self]
// CHECK:STDOUT: %Main.import_ref.f0d: <witness> = import_ref Main//c, loc7_13, loaded [concrete = constants.%I.impl_witness]
// CHECK:STDOUT: %Main.import_ref.29a: type = import_ref Main//c, loc7_6, loaded [concrete = constants.%C]
// CHECK:STDOUT: %Main.import_ref.f50: type = import_ref Main//c, loc7_11, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Get = imports.%Main.Get
// CHECK:STDOUT: .I = imports.%Main.I
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Call = %Call.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %Call.decl: %Call.type = fn_decl @Call [concrete = constants.%Call] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I [from "i.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.e5d
// CHECK:STDOUT: .F = imports.%Main.import_ref.c44
// CHECK:STDOUT: witness = (imports.%Main.F)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @impl: imports.%Main.import_ref.29a as imports.%Main.import_ref.f50 [from "c.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: witness = imports.%Main.import_ref.f0d
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C [from "get.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8db
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.6a9
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Call() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Get.ref: %Get.type = name_ref Get, imports.%Main.Get [concrete = constants.%Get]
// CHECK:STDOUT: %.loc9_7.1: ref %C = temporary_storage
// CHECK:STDOUT: %Get.call: init %C = call %Get.ref() to %.loc9_7.1
// CHECK:STDOUT: %I.ref: type = name_ref I, imports.%Main.I [concrete = constants.%I.type]
// CHECK:STDOUT: %F.ref: %I.assoc_type = name_ref F, imports.%Main.import_ref.c44 [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0: %.1b3 = impl_witness_access constants.%I.impl_witness, element0 [concrete = constants.%F.a2e]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %Get.call, %impl.elem0
// CHECK:STDOUT: %.loc9_7.2: ref %C = temporary %.loc9_7.1, %Get.call
// CHECK:STDOUT: %.loc9_7.3: %C = bind_value %.loc9_7.2
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %bound_method(%.loc9_7.3)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Get() -> %C [from "get.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F.1(imports.%Main.import_ref.5dd: %I.type) [from "i.carbon"] {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic = %Self.as_type (constants.%Self.as_type)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn[%self.param_patt: @F.1.%Self.as_type (%Self.as_type)]();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F.2[%self.param_patt: %C]() [from "c.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.as_type => constants.%Self.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
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