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carbon-lang/toolchain/check/testdata/impl/lookup/transitive.carbon
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Richard Smith 5f888e1124 Treat associated constants as entities parameterized by Self (#4837) 
Add a full entity representation for associated constants, and build a
`Generic` object for them. This `Generic` is parameterized by the
enclosing `Self` type, allowing the use of `Self` within the type of the
associated constant to be supported.

When performing impl lookup for an associated constant, produce the type
with the provided self type substituted for its `Self` along with any
generic parameters of the interface.

Split the handling of associated constant declarations into two parts,
corresponding to the code before the `=`, and the code between the `=`
and `;` (if any). The former goes into the generic declaration region;
the latter into the generic definition region. This prepares us to
handle the default value for an associated constant, but for now we're
just storing the information and not actually using it.

Remove the entity type field from `assoc_entity_type`, because it's
almost unused and is an attractive nuisance -- it must necessarily be a
type in the generic scope of the associated constant rather than in the
scope of the instruction (because there is no `Self` anywhere else),
which means that it's hard to substitute into or derive meaning from.

See `toolchain/check/testdata/impl/assoc_const_self.carbon` for tests of
the new functionality; these used to cause the toolchain to crash.
2025-01-25 02:13:52 +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(); }
// --- c.carbon
library "[[@TEST_NAME]]";
import library "i";
class C {}
impl C as I { fn F() {} }
// --- 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> [template]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %F.type: type = fn_type @F [template]
// CHECK:STDOUT: %F: %F.type = struct_value () [template]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type %I.type [template]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%F.decl [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// 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 [template = 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 [template = constants.%F] {} {}
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %F.decl [template = 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: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- c.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [template]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [template]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [template]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %F.type.cf0: type = fn_type @F.1 [template]
// CHECK:STDOUT: %F.bc6: %F.type.cf0 = struct_value () [template]
// CHECK:STDOUT: %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template]
// CHECK:STDOUT: %F.type.5d6: type = fn_type @F.2 [template]
// CHECK:STDOUT: %F.a2e: %F.type.5d6 = struct_value () [template]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, %impl_witness [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.I: type = import_ref Main//i, I, loaded [template = constants.%I.type]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.e5d = import_ref Main//i, inst17 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.1e0 = import_ref Main//i, loc4_21, unloaded
// CHECK:STDOUT: %Main.F: %F.type.cf0 = import_ref Main//i, F, loaded [template = constants.%F.bc6]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// 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 [template = constants.%C] {} {}
// CHECK:STDOUT: impl_decl @impl [template] {} {
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [template = constants.%C]
// CHECK:STDOUT: %I.ref: type = name_ref I, imports.%Main.I [template = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%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.1e0
// 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 [template = constants.%F.a2e] {} {}
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: witness = file.%impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [template = 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(constants.%Self: %I.type) [from "i.carbon"] {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F.2() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%I.facet) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- get.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [template]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [template]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
// CHECK:STDOUT: %Get.type: type = fn_type @Get [template]
// CHECK:STDOUT: %Get: %Get.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.C: type = import_ref Main//c, C, loaded [template = constants.%C]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// 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 [template = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.2c4 = import_ref Main//c, inst18 [no loc], unloaded
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// 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 [template = constants.%Get] {
// CHECK:STDOUT: %return.patt: %C = return_slot_pattern
// CHECK:STDOUT: %return.param_patt: %C = out_param_pattern %return.patt, runtime_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %C.ref: type = name_ref C, imports.%Main.C [template = constants.%C]
// CHECK:STDOUT: %return.param: ref %C = out_param runtime_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 [template]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [template]
// CHECK:STDOUT: %Call: %Call.type = struct_value () [template]
// CHECK:STDOUT: %Get.type: type = fn_type @Get [template]
// CHECK:STDOUT: %Get: %Get.type = struct_value () [template]
// CHECK:STDOUT: %C: type = class_type @C [template]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [template]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [template]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type %I.type [template]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, imports.%Main.import_ref.e03 [template]
// CHECK:STDOUT: %impl_witness: <witness> = impl_witness (imports.%Main.import_ref.742) [template]
// CHECK:STDOUT: %F.type.cf0: type = fn_type @F.1 [template]
// CHECK:STDOUT: %F.type.5d6: type = fn_type @F.2 [template]
// CHECK:STDOUT: %F.a2e: %F.type.5d6 = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.Get: %Get.type = import_ref Main//get, Get, loaded [template = constants.%Get]
// CHECK:STDOUT: %Main.I: type = import_ref Main//i, I, loaded [template = constants.%I.type]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.8db: <witness> = import_ref Main//get, inst21 [indirect], loaded [template = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.6a9 = import_ref Main//get, inst22 [indirect], unloaded
// CHECK:STDOUT: %Main.import_ref.e5d = import_ref Main//i, inst17 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.bcb: %I.assoc_type = import_ref Main//i, loc4_21, loaded [template = constants.%assoc0]
// CHECK:STDOUT: %Main.F = import_ref Main//i, F, unloaded
// CHECK:STDOUT: %Main.import_ref.e53: <witness> = import_ref Main//c, loc7_13, loaded [template = constants.%impl_witness]
// CHECK:STDOUT: %Main.import_ref.29a: type = import_ref Main//c, loc7_6, loaded [template = constants.%C]
// CHECK:STDOUT: %Main.import_ref.f50: type = import_ref Main//c, loc7_11, loaded [template = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// 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 [template = 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.bcb
// 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.e53
// 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 [template = constants.%Get]
// CHECK:STDOUT: %.loc9: ref %C = temporary_storage
// CHECK:STDOUT: %Get.call: init %C = call %Get.ref() to %.loc9
// CHECK:STDOUT: %I.ref: type = name_ref I, imports.%Main.I [template = constants.%I.type]
// CHECK:STDOUT: %F.ref: %I.assoc_type = name_ref F, imports.%Main.import_ref.bcb [template = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0: %F.type.cf0 = impl_witness_access constants.%impl_witness, element0 [template = constants.%F.a2e]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %impl.elem0()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Get() -> %C [from "get.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F.1(constants.%Self: %I.type) [from "i.carbon"] {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F.2() [from "c.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%Self) {}
// CHECK:STDOUT:
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