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4416f3525b9b6abf8cc465bc8b866f1baaa6cd82
carbon-lang/toolchain/check/testdata/function/call/ref.carbon
T
Dana Jansens 4416f3525b Canonicalize generated functions for Core witnesses (#7729) 
Use a single `SemIR::Function` per `Core` interface method, whether it's
generated locally or imported. This prevents generating duplicate
functions, which lead to different types when the witness appears in a
`FacetValue` as part of a specific for a class.

We use a `CanonicalValueStore` of `GeneratedFunction` objects that allow
finding an existing FunctionId for a `Generated` special function before
(re-)generating it. Mangling for `Generated` functions is also moved to
use the values from the `GeneratedFunction`'s canonicalization key, so
that we have a consistent source of truth for the unique ID of a
`Generated` function across all files.

New tests are in
`toolchain/check/testdata/impl/custom_witness/destroy.carbon`.
2026-09-15 16:02:13 +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
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
// EXTRA-ARGS: --dump-sem-ir-ranges=only
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/function/call/ref.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/call/ref.carbon
// --- basics.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
fn F(ref x: i32);
fn G() {
var y: i32 = 0;
F(ref y);
}
//@dump-sem-ir-end
// --- class.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
class C {
fn F(ref self);
}
fn G() {
var c: C;
c.F();
}
//@dump-sem-ir-end
// --- fail_ref_not_durable_ref.carbon
library "[[@TEST_NAME]]";
fn F(ref x: i32);
fn G() {
let y: i32 = 0;
// CHECK:STDERR: fail_ref_not_durable_ref.carbon:[[@LINE+7]]:5: error: value expression passed to reference parameter [ValueForRefParam]
// CHECK:STDERR: F(ref y);
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_ref_not_durable_ref.carbon:[[@LINE-7]]:6: note: initializing function parameter [InCallToFunctionParam]
// CHECK:STDERR: fn F(ref x: i32);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
F(ref y);
}
// --- fail_missing_ref.carbon
library "[[@TEST_NAME]]";
fn F(ref x: i32);
fn G() {
var y: i32 = 0;
// CHECK:STDERR: fail_missing_ref.carbon:[[@LINE+7]]:5: error: argument to `ref` parameter not marked with `ref` [RefParamNoRefTag]
// CHECK:STDERR: F(y);
// CHECK:STDERR: ^
// CHECK:STDERR: fail_missing_ref.carbon:[[@LINE-7]]:6: note: initializing function parameter [InCallToFunctionParam]
// CHECK:STDERR: fn F(ref x: i32);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
F(y);
}
// --- fail_unnecessary_ref.carbon
library "[[@TEST_NAME]]";
fn F(x: i32);
fn G() {
var y: i32 = 0;
// CHECK:STDERR: fail_unnecessary_ref.carbon:[[@LINE+4]]:27: error: `ref` tag is not an argument to a `ref` parameter [RefTagNoRefParam]
// CHECK:STDERR: var unused z: (i32,) = (ref y,);
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
var unused z: (i32,) = (ref y,);
// CHECK:STDERR: fail_unnecessary_ref.carbon:[[@LINE+7]]:5: error: `ref` tag is not an argument to a `ref` parameter [RefTagNoRefParam]
// CHECK:STDERR: F(ref y);
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_unnecessary_ref.carbon:[[@LINE-13]]:6: note: initializing function parameter [InCallToFunctionParam]
// CHECK:STDERR: fn F(x: i32);
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
F(ref y);
}
// --- converted_ref_arg.carbon
library "[[@TEST_NAME]]";
base class C {}
class D { extend base: C; }
fn F(ref c: C);
fn G(ref d: D) { F(ref d); }
// CHECK:STDOUT: --- basics.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = ref_param_pattern [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %i32.builtin: type = int_type signed, %int_32 [concrete]
// CHECK:STDOUT: %y.patt: %pattern_type.6b6 = ref_binding_pattern y [concrete]
// CHECK:STDOUT: %y.var_patt: %pattern_type.6b6 = var_pattern %y.patt [concrete]
// CHECK:STDOUT: %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %ImplicitAs.type.914: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = symbolic_binding To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e74: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.845: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e74 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.a2a: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.1aa, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.2ba: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.e39: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.2ba = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.914 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.a2a) [concrete]
// CHECK:STDOUT: %ImplicitAs.WithSelf.Convert.type.8eb: type = fn_type @ImplicitAs.WithSelf.Convert, @ImplicitAs.WithSelf(%i32, %ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %.b7a: type = fn_type_with_self_type %ImplicitAs.WithSelf.Convert.type.8eb, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %int_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.e39 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.e39, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_0.3c0: %i32 = int_value 0 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef016f.2: type = fn_type @Destroy.WithSelf.Op.loc8_3.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403171.2: %Destroy.WithSelf.Op.type.ef016f.2 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.edf: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e74) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.845)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.1aa = impl_witness_table (%Core.import_ref.edf), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %x.param_patt: %pattern_type.6b6 = ref_param_pattern [concrete = constants.%x.param_patt]
// CHECK:STDOUT: %x.patt: %pattern_type.6b6 = wrapper_binding_pattern x, %x.param_patt [concrete = constants.%x.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %x.param: ref %i32 = ref_param call_param0
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %x: ref %i32 = wrapper_binding x, %x.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%x.param: ref %i32);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %y.var: ref %i32 = var_storage %y.var_patt
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %impl.elem0: %.b7a = impl_witness_access constants.%ImplicitAs.impl_witness.a2a, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.e39]
// CHECK:STDOUT: %bound_method.loc8_3.1: <bound method> = bound_method %int_0, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc8_3.2: <bound method> = bound_method %int_0, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call: init %i32 = call %bound_method.loc8_3.2(%int_0) [concrete = constants.%int_0.3c0]
// CHECK:STDOUT: %.loc8: init %i32 = converted %int_0, %Core.IntLiteral.as.ImplicitAs.impl.Convert.call [concrete = constants.%int_0.3c0]
// CHECK:STDOUT: assign %y.var, %.loc8
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %y: ref %i32 = wrapper_binding y, %y.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %y.patt: %pattern_type.6b6 = ref_binding_pattern y [concrete = constants.%y.patt]
// CHECK:STDOUT: %y.var_patt: %pattern_type.6b6 = var_pattern %y.patt [concrete = constants.%y.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %y.ref: ref %i32 = name_ref y, %y
// CHECK:STDOUT: %.loc10: %i32 = ref_tag %y.ref
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.ref(%y.ref)
// CHECK:STDOUT: %Destroy.WithSelf.Op.bound: <bound method> = bound_method %y.var, constants.%Destroy.WithSelf.Op.403171.2
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call %Destroy.WithSelf.Op.bound(%y.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc8_3.1(%self.param: ref %i32.builtin) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc8_3.2(%self.param: ref %i32) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- class.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %pattern_type.98b: type = pattern_type %C [concrete]
// CHECK:STDOUT: %self.param_patt.99a: %pattern_type.98b = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.cbd: %pattern_type.98b = wrapper_binding_pattern self, %self.param_patt.99a [concrete]
// CHECK:STDOUT: %C.F.type: type = fn_type @C.F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %C.F: %C.F.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type.98b = ref_binding_pattern c [concrete]
// CHECK:STDOUT: %c.var_patt: %pattern_type.98b = var_pattern %c.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.150: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.53a: %T.as.DefaultOrUnformed.impl.Op.type.150 = struct_value () [symbolic]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.38f: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.856, @T.as.DefaultOrUnformed.impl(%C) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %C, (%DefaultOrUnformed.impl_witness.38f) [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef016f.2: type = fn_type @Destroy.WithSelf.Op.loc10_3.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403171.2: %Destroy.WithSelf.Op.type.ef016f.2 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.cc8: @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op.type (%T.as.DefaultOrUnformed.impl.Op.type.150) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op (constants.%T.as.DefaultOrUnformed.impl.Op.53a)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.856 = impl_witness_table (%Core.import_ref.cc8), @T.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %C.F.decl: %C.F.type = fn_decl @C.F [concrete = constants.%C.F] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.98b = ref_param_pattern [concrete = constants.%self.param_patt.99a]
// CHECK:STDOUT: %self.patt: %pattern_type.98b = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.cbd]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %C = ref_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
// CHECK:STDOUT: %self: ref %C = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%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: .F = %C.F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.F(%self.param: ref %C);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.var: ref %C = var_storage %c.var_patt
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%C, (constants.%DefaultOrUnformed.impl_witness.38f) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc10_11.1: %DefaultOrUnformed.type = converted constants.%C, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc10_11.1 [concrete = constants.%C]
// CHECK:STDOUT: %.loc10_11.2: type = converted %.loc10_11.1, %as_type [concrete = constants.%C]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc10_3: ref %C = splice_block %c.var {}
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.call: init %C to %.loc10_3 = call %T.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign %c.var, %T.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %c: ref %C = wrapper_binding c, %c.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.98b = ref_binding_pattern c [concrete = constants.%c.patt]
// CHECK:STDOUT: %c.var_patt: %pattern_type.98b = var_pattern %c.patt [concrete = constants.%c.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.ref: ref %C = name_ref c, %c
// CHECK:STDOUT: %F.ref: %C.F.type = name_ref F, @C.%C.F.decl [concrete = constants.%C.F]
// CHECK:STDOUT: %C.F.bound: <bound method> = bound_method %c.ref, %F.ref
// CHECK:STDOUT: %C.F.call: init %empty_tuple.type = call %C.F.bound(%c.ref)
// CHECK:STDOUT: %Destroy.WithSelf.Op.bound: <bound method> = bound_method %c.var, constants.%Destroy.WithSelf.Op.403171.2
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call %Destroy.WithSelf.Op.bound(%c.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc10_3.1(%self.param: ref %empty_struct_type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc10_3.2(%self.param: ref %C) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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