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carbon-lang/toolchain/check/testdata/class/init_as.carbon
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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/class/init_as.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/init_as.carbon
class Class {
var a: i32;
var b: i32;
}
fn F() -> i32 {
return ({.a = 1, .b = 2} as Class).a;
}
// CHECK:STDOUT: --- init_as.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Class: type = class_type @Class [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %Class.elem: type = unbound_element_type %Class, %i32 [concrete]
// CHECK:STDOUT: %struct_type.a.b.501: type = struct_type {.a: %i32, .b: %i32} [concrete]
// CHECK:STDOUT: %complete_type.705: <witness> = complete_type_witness %struct_type.a.b.501 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
// CHECK:STDOUT: %struct_type.a.b.cfd: type = struct_type {.a: Core.IntLiteral, .b: Core.IntLiteral} [concrete]
// CHECK:STDOUT: %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.a2f = impl_witness_table (imports.%Core.import_ref.a5b), @impl.4f9 [concrete]
// CHECK:STDOUT: %ImplicitAs.impl_witness.c75: <witness> = impl_witness %ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
// CHECK:STDOUT: %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
// CHECK:STDOUT: %Convert.956: %Convert.type.035 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
// CHECK:STDOUT: %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Convert.bound.ab5: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
// CHECK:STDOUT: %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
// CHECK:STDOUT: %bound_method.9a1: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.5d2: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: %Convert.bound.ef9: <bound method> = bound_method %int_2.ecc, %Convert.956 [concrete]
// CHECK:STDOUT: %bound_method.b92: <bound method> = bound_method %int_2.ecc, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_2.ef8: %i32 = int_value 2 [concrete]
// CHECK:STDOUT: %Class.val: %Class = struct_value (%int_1.5d2, %int_2.ef8) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .ImplicitAs = %Core.ImplicitAs
// 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: .Class = %Class.decl
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Class.decl: type = class_decl @Class [concrete = constants.%Class] {} {}
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %return.patt: %i32 = return_slot_pattern
// CHECK:STDOUT: %return.param_patt: %i32 = out_param_pattern %return.patt, call_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param0
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Class {
// CHECK:STDOUT: %.loc12_8: %Class.elem = field_decl a, element0 [concrete]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %.loc12_3: %Class.elem = var_pattern %.loc12_8
// CHECK:STDOUT: }
// CHECK:STDOUT: %.var.loc12: ref %Class.elem = var <none>
// CHECK:STDOUT: %.loc13_8: %Class.elem = field_decl b, element1 [concrete]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %.loc13_3: %Class.elem = var_pattern %.loc13_8
// CHECK:STDOUT: }
// CHECK:STDOUT: %.var.loc13: ref %Class.elem = var <none>
// CHECK:STDOUT: %struct_type.a.b: type = struct_type {.a: %i32, .b: %i32} [concrete = constants.%struct_type.a.b.501]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %struct_type.a.b [concrete = constants.%complete_type.705]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Class
// CHECK:STDOUT: .a = %.loc12_8
// CHECK:STDOUT: .b = %.loc13_8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() -> %i32 {
// CHECK:STDOUT: !entry:
// 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: %.loc17_26.1: %struct_type.a.b.cfd = struct_literal (%int_1, %int_2)
// CHECK:STDOUT: %Class.ref: type = name_ref Class, file.%Class.decl [concrete = constants.%Class]
// CHECK:STDOUT: %impl.elem0.loc17_26.1: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT: %bound_method.loc17_26.1: <bound method> = bound_method %int_1, %impl.elem0.loc17_26.1 [concrete = constants.%Convert.bound.ab5]
// CHECK:STDOUT: %specific_fn.loc17_26.1: <specific function> = specific_function %impl.elem0.loc17_26.1, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc17_26.2: <bound method> = bound_method %int_1, %specific_fn.loc17_26.1 [concrete = constants.%bound_method.9a1]
// CHECK:STDOUT: %int.convert_checked.loc17_26.1: init %i32 = call %bound_method.loc17_26.2(%int_1) [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc17_26.2: init %i32 = converted %int_1, %int.convert_checked.loc17_26.1 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc17_26.3: ref %Class = temporary_storage
// CHECK:STDOUT: %.loc17_26.4: ref %i32 = class_element_access %.loc17_26.3, element0
// CHECK:STDOUT: %.loc17_26.5: init %i32 = initialize_from %.loc17_26.2 to %.loc17_26.4 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %impl.elem0.loc17_26.2: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT: %bound_method.loc17_26.3: <bound method> = bound_method %int_2, %impl.elem0.loc17_26.2 [concrete = constants.%Convert.bound.ef9]
// CHECK:STDOUT: %specific_fn.loc17_26.2: <specific function> = specific_function %impl.elem0.loc17_26.2, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc17_26.4: <bound method> = bound_method %int_2, %specific_fn.loc17_26.2 [concrete = constants.%bound_method.b92]
// CHECK:STDOUT: %int.convert_checked.loc17_26.2: init %i32 = call %bound_method.loc17_26.4(%int_2) [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc17_26.6: init %i32 = converted %int_2, %int.convert_checked.loc17_26.2 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc17_26.7: ref %i32 = class_element_access %.loc17_26.3, element1
// CHECK:STDOUT: %.loc17_26.8: init %i32 = initialize_from %.loc17_26.6 to %.loc17_26.7 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc17_26.9: init %Class = class_init (%.loc17_26.5, %.loc17_26.8), %.loc17_26.3 [concrete = constants.%Class.val]
// CHECK:STDOUT: %.loc17_26.10: ref %Class = temporary %.loc17_26.3, %.loc17_26.9
// CHECK:STDOUT: %.loc17_28: ref %Class = converted %.loc17_26.1, %.loc17_26.10
// CHECK:STDOUT: %a.ref: %Class.elem = name_ref a, @Class.%.loc12_8 [concrete = @Class.%.loc12_8]
// CHECK:STDOUT: %.loc17_37.1: ref %i32 = class_element_access %.loc17_28, element0
// CHECK:STDOUT: %.loc17_37.2: %i32 = bind_value %.loc17_37.1
// CHECK:STDOUT: return %.loc17_37.2
// CHECK:STDOUT: }
// CHECK:STDOUT:
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