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carbon-lang/toolchain/check/testdata/tuple/access/element_access.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/tuple/access/element_access.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/access/element_access.carbon
var a: (i32,) = (12,);
var b: (i32,) = a;
var c: i32 = b.0;
// CHECK:STDOUT: --- element_access.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %tuple.type.85c: type = tuple_type (type) [concrete]
// CHECK:STDOUT: %tuple.type.a1c: type = tuple_type (%i32) [concrete]
// CHECK:STDOUT: %int_12.6a3: Core.IntLiteral = int_value 12 [concrete]
// CHECK:STDOUT: %tuple.type.985: type = tuple_type (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: <bound method> = bound_method %int_12.6a3, %Convert.956 [concrete]
// CHECK:STDOUT: %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_12.6a3, %Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_12.1e1: %i32 = int_value 12 [concrete]
// CHECK:STDOUT: %tuple: %tuple.type.a1c = tuple_value (%int_12.1e1) [concrete]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [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: .a = %a
// CHECK:STDOUT: .b = %b
// CHECK:STDOUT: .c = %c
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %tuple.type.a1c = binding_pattern a
// CHECK:STDOUT: %.loc11_1: %tuple.type.a1c = var_pattern %a.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.var: ref %tuple.type.a1c = var a
// CHECK:STDOUT: %.loc11_13.1: type = splice_block %.loc11_13.3 [concrete = constants.%tuple.type.a1c] {
// CHECK:STDOUT: %int_32.loc11: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc11: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %.loc11_13.2: %tuple.type.85c = tuple_literal (%i32.loc11)
// CHECK:STDOUT: %.loc11_13.3: type = converted %.loc11_13.2, constants.%tuple.type.a1c [concrete = constants.%tuple.type.a1c]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: ref %tuple.type.a1c = bind_name a, %a.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %b.patt: %tuple.type.a1c = binding_pattern b
// CHECK:STDOUT: %.loc12_1: %tuple.type.a1c = var_pattern %b.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %b.var: ref %tuple.type.a1c = var b
// CHECK:STDOUT: %.loc12_13.1: type = splice_block %.loc12_13.3 [concrete = constants.%tuple.type.a1c] {
// CHECK:STDOUT: %int_32.loc12: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc12: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %.loc12_13.2: %tuple.type.85c = tuple_literal (%i32.loc12)
// CHECK:STDOUT: %.loc12_13.3: type = converted %.loc12_13.2, constants.%tuple.type.a1c [concrete = constants.%tuple.type.a1c]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: ref %tuple.type.a1c = bind_name b, %b.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %i32 = binding_pattern c
// CHECK:STDOUT: %.loc13_1: %i32 = var_pattern %c.patt
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.var: ref %i32 = var c
// CHECK:STDOUT: %.loc13_8: type = splice_block %i32.loc13 [concrete = constants.%i32] {
// CHECK:STDOUT: %int_32.loc13: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc13: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: ref %i32 = bind_name c, %c.var
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %int_12: Core.IntLiteral = int_value 12 [concrete = constants.%int_12.6a3]
// CHECK:STDOUT: %.loc11_21.1: %tuple.type.985 = tuple_literal (%int_12)
// CHECK:STDOUT: %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT: %bound_method.loc11_21.1: <bound method> = bound_method %int_12, %impl.elem0 [concrete = constants.%Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc11_21.2: <bound method> = bound_method %int_12, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %int.convert_checked: init %i32 = call %bound_method.loc11_21.2(%int_12) [concrete = constants.%int_12.1e1]
// CHECK:STDOUT: %.loc11_21.2: init %i32 = converted %int_12, %int.convert_checked [concrete = constants.%int_12.1e1]
// CHECK:STDOUT: %.loc11_21.3: init %tuple.type.a1c = tuple_init (%.loc11_21.2) to file.%a.var [concrete = constants.%tuple]
// CHECK:STDOUT: %.loc11_1: init %tuple.type.a1c = converted %.loc11_21.1, %.loc11_21.3 [concrete = constants.%tuple]
// CHECK:STDOUT: assign file.%a.var, %.loc11_1
// CHECK:STDOUT: %a.ref: ref %tuple.type.a1c = name_ref a, file.%a
// CHECK:STDOUT: %tuple.elem0.loc12: ref %i32 = tuple_access %a.ref, element0
// CHECK:STDOUT: %.loc12_17.1: %i32 = bind_value %tuple.elem0.loc12
// CHECK:STDOUT: %.loc12_17.2: init %tuple.type.a1c = tuple_init (%.loc12_17.1) to file.%b.var
// CHECK:STDOUT: %.loc12_1: init %tuple.type.a1c = converted %a.ref, %.loc12_17.2
// CHECK:STDOUT: assign file.%b.var, %.loc12_1
// CHECK:STDOUT: %b.ref: ref %tuple.type.a1c = name_ref b, file.%b
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0]
// CHECK:STDOUT: %tuple.elem0.loc13: ref %i32 = tuple_access %b.ref, element0
// CHECK:STDOUT: %.loc13: %i32 = bind_value %tuple.elem0.loc13
// CHECK:STDOUT: assign file.%c.var, %.loc13
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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