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carbon-lang/toolchain/check/testdata/impl/lookup/instance_method.carbon
T
Richard SmithandJon Ross-Perkins fcfb1345d5 Support accessing associated functions by member access into facets (#4872) 
For an expression such as `(Type as Interface).AssocFn()`, track the
`Self` type `Type` in the result of the member access so that it's
available when checking the function call.

This introduces a new kind of type, `ImplFunctionType`, that represents
the type of a function that is expected within an impl, modeled as the
type of the function within the interface plus a value to use as `Self`.
Calls to values of this type behave like calls to the underlying
function except that the `Self` parameter is pre-bound to the self type
from the facet.

In order to support this, fix an issue where the imported list of
generic bindings lost their association with their enclosing generic.
This adds a little complexity to `import_ref`, including a new recursive
cycle that I intend to address in a follow-up PR.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2025-02-04 22:38:38 +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/instance_method.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/lookup/instance_method.carbon
class C;
interface I {
fn F[self: Self]() -> i32;
}
class C {
extend impl as I {
fn F[self: Self]() -> i32;
}
}
fn F(c: C) -> i32 {
return c.F();
}
// CHECK:STDOUT: --- instance_method.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [template]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [template]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [template]
// CHECK:STDOUT: %F.type.cf0: type = fn_type @F.1 [template]
// CHECK:STDOUT: %F.bc6: %F.type.cf0 = 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: %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template]
// CHECK:STDOUT: %F.type.f36: type = fn_type @F.2 [template]
// CHECK:STDOUT: %F.4c3: %F.type.f36 = struct_value () [template]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, %impl_witness [template]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [template]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
// CHECK:STDOUT: %F.type.b25: type = fn_type @F.3 [template]
// CHECK:STDOUT: %F.c41: %F.type.b25 = struct_value () [template]
// CHECK:STDOUT: %.f8b: type = fn_type_with_self_type %F.type.cf0, %I.facet [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: .Int = %Core.Int
// 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: .C = %C.decl.loc11
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %C.decl.loc11: type = class_decl @C [template = constants.%C] {} {}
// CHECK:STDOUT: %I.decl: type = interface_decl @I [template = constants.%I.type] {} {}
// CHECK:STDOUT: %C.decl.loc17: type = class_decl @C [template = constants.%C] {} {}
// CHECK:STDOUT: %F.decl: %F.type.b25 = fn_decl @F.3 [template = constants.%F.c41] {
// CHECK:STDOUT: %c.patt: %C = binding_pattern c
// CHECK:STDOUT: %c.param_patt: %C = value_param_pattern %c.patt, runtime_param0
// CHECK:STDOUT: %return.patt: %i32 = return_slot_pattern
// CHECK:STDOUT: %return.param_patt: %i32 = out_param_pattern %return.patt, runtime_param1
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(constants.%int_32) [template = constants.%i32]
// CHECK:STDOUT: %c.param: %C = value_param runtime_param0
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl.loc11 [template = constants.%C]
// CHECK:STDOUT: %c: %C = bind_name c, %c.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param runtime_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// 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.cf0 = fn_decl @F.1 [template = constants.%F.bc6] {
// CHECK:STDOUT: %self.patt: @F.1.%Self.as_type.loc14_14.1 (%Self.as_type) = binding_pattern self
// CHECK:STDOUT: %self.param_patt: @F.1.%Self.as_type.loc14_14.1 (%Self.as_type) = value_param_pattern %self.patt, runtime_param0
// CHECK:STDOUT: %return.patt: %i32 = return_slot_pattern
// CHECK:STDOUT: %return.param_patt: %i32 = out_param_pattern %return.patt, runtime_param1
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(constants.%int_32) [template = constants.%i32]
// CHECK:STDOUT: %self.param: @F.1.%Self.as_type.loc14_14.1 (%Self.as_type) = value_param runtime_param0
// CHECK:STDOUT: %.loc14_14.1: type = splice_block %.loc14_14.2 [symbolic = %Self.as_type.loc14_14.1 (constants.%Self.as_type)] {
// CHECK:STDOUT: %Self.ref: %I.type = name_ref Self, @I.%Self [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc14_14.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc14_14.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %.loc14_14.2: type = converted %Self.ref, %Self.as_type.loc14_14.2 [symbolic = %Self.as_type.loc14_14.1 (constants.%Self.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @F.1.%Self.as_type.loc14_14.1 (%Self.as_type) = bind_name self, %self.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param runtime_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// 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: impl @impl: %Self.ref as %I.ref {
// CHECK:STDOUT: %F.decl: %F.type.f36 = fn_decl @F.2 [template = constants.%F.4c3] {
// CHECK:STDOUT: %self.patt: %C = binding_pattern self
// CHECK:STDOUT: %self.param_patt: %C = value_param_pattern %self.patt, runtime_param0
// CHECK:STDOUT: %return.patt: %i32 = return_slot_pattern
// CHECK:STDOUT: %return.param_patt: %i32 = out_param_pattern %return.patt, runtime_param1
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(constants.%int_32) [template = constants.%i32]
// CHECK:STDOUT: %self.param: %C = value_param runtime_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [template = constants.%C]
// CHECK:STDOUT: %self: %C = bind_name self, %self.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param runtime_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: witness = @C.%impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: impl_decl @impl [template] {} {
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [template = constants.%C]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [template = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%impl_witness]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: extend @impl.%I.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F.1(@I.%Self: %I.type) {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc14_14.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc14_14.1 (constants.%Self.as_type)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn[%self.param_patt: @F.1.%Self.as_type.loc14_14.1 (%Self.as_type)]() -> %i32;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F.2[%self.param_patt: %C]() -> %i32;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F.3(%c.param_patt: %C) -> %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %C = name_ref c, %c
// CHECK:STDOUT: %F.ref: %I.assoc_type = name_ref F, @I.%assoc0 [template = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0: %.f8b = impl_witness_access constants.%impl_witness, element0 [template = constants.%F.4c3]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %F.call: init %i32 = call %bound_method(%c.ref)
// CHECK:STDOUT: %.loc24_15.1: %i32 = value_of_initializer %F.call
// CHECK:STDOUT: %.loc24_15.2: %i32 = converted %F.call, %.loc24_15.1
// CHECK:STDOUT: return %.loc24_15.2
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F.1(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.as_type.loc14_14.1 => 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.loc14_14.1 => constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT:
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