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Chandler Carruthandjosh11b
7871237c15
Implements proposal #7016: `self` moves from the deduced implicit list (`fn F[self: Self]()`) to the front of the explicit list. Its type may be written explicitly (`fn F(self: Self)`) or omitted, in which case it defaults to `Self` (`fn F(self)`, `fn F(ref self)`); `self` in the implicit list is rejected. Throughout checking, `self` is modeled as the first explicit parameter. Because a method is just a function whose first parameter is `self`, it can also be called as an ordinary function with the receiver passed explicitly (`Type.M(obj, ...)`), not only as `obj.M(...)`. A new `SemIR::CallArgParamPatterns` helper chooses the parameters matched against the explicit arguments, excluding a leading `self` only when it is supplied as a method-call receiver; arity checking, conversion, and generic deduction use it. The resulting SemIR and lowering are unchanged: `self` is still `call_param0`, and witnesses, thunks, and vtables are unaffected. An omitted `self` type is parsed as a `SelfBindingPattern` node with no type expression; checking synthesizes the `Self` type so it behaves exactly like `self: Self`. However, the exact spelling used must match between a forward declaration and a definition, following #3763's rules around declaration matching. Generated functions, thunks, and C++ interop import/export build `self` as the first explicit parameter, and the `self`-type override (e.g. Derived->Base for a virtual override) applies to the explicit `self`. Placement is validated by new diagnostics: `SelfInImplicitParamList`, `SelfNotFirstParam`, and `SelfOutsideParamList`. The benchmark source generator and the documentation adopt the `(self)` shorthand; the prelude, the examples, and the test data are migrated in the following commits. Assisted-by: Claude Code with Claude Opus 4.7 --------- Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
80 lines
4.6 KiB
Plaintext
80 lines
4.6 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/as/var_init.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/as/var_init.carbon
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// --- var_init.carbon
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library "[[@TEST_NAME]]";
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class X {
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impl () as Core.ImplicitAs(X) {
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fn Convert(unused self: ()) -> X { return {}; }
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}
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}
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fn Convert(unused t: ()) {
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//@dump-sem-ir-begin
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var unused x: X = ();
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//@dump-sem-ir-end
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}
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// CHECK:STDOUT: --- var_init.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %X: type = class_type @X [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
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// CHECK:STDOUT: %ImplicitAs.type.7cc: type = facet_type <@ImplicitAs, @ImplicitAs(%X)> [concrete]
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// CHECK:STDOUT: %ImplicitAs.impl_witness: <witness> = impl_witness @empty_tuple.type.as.ImplicitAs.impl.%ImplicitAs.impl_witness_table [concrete]
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// CHECK:STDOUT: %pattern_type.6cb: type = pattern_type %X [concrete]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.type: type = fn_type @empty_tuple.type.as.ImplicitAs.impl.Convert [concrete]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert: %empty_tuple.type.as.ImplicitAs.impl.Convert.type = struct_value () [concrete]
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// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.7cc = facet_value %empty_tuple.type, (%ImplicitAs.impl_witness) [concrete]
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// CHECK:STDOUT: %ImplicitAs.WithSelf.Convert.type.8de: type = fn_type @ImplicitAs.WithSelf.Convert, @ImplicitAs.WithSelf(%X, %ImplicitAs.facet) [concrete]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %.ce8: type = fn_type_with_self_type %ImplicitAs.WithSelf.Convert.type.8de, %ImplicitAs.facet [concrete]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %empty_tuple, %empty_tuple.type.as.ImplicitAs.impl.Convert [concrete]
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// CHECK:STDOUT: %Destroy.Op.type.1d8f74.2: type = fn_type @Destroy.Op.loc12_3.2 [concrete]
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// CHECK:STDOUT: %Destroy.Op.1a2547.2: %Destroy.Op.type.1d8f74.2 = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Convert(%t.param: %empty_tuple.type) {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %x.patt: %pattern_type.6cb = ref_binding_pattern x [concrete]
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// CHECK:STDOUT: %x.var_patt: %pattern_type.6cb = var_pattern %x.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %x.var: ref %X = var %x.var_patt
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// CHECK:STDOUT: %.loc12_22.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
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// CHECK:STDOUT: %impl.elem0: %.ce8 = impl_witness_access constants.%ImplicitAs.impl_witness, element0 [concrete = constants.%empty_tuple.type.as.ImplicitAs.impl.Convert]
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// CHECK:STDOUT: %bound_method: <bound method> = bound_method %.loc12_22.1, %impl.elem0 [concrete = constants.%empty_tuple.type.as.ImplicitAs.impl.Convert.bound]
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// CHECK:STDOUT: %.loc12_3.1: ref %X = splice_block %x.var {}
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// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete = constants.%empty_tuple]
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// CHECK:STDOUT: %.loc12_22.2: %empty_tuple.type = converted %.loc12_22.1, %empty_tuple [concrete = constants.%empty_tuple]
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// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.call: init %X to %.loc12_3.1 = call %bound_method(%.loc12_22.2)
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// CHECK:STDOUT: %.loc12_3.2: init %X = converted %.loc12_22.1, %empty_tuple.type.as.ImplicitAs.impl.Convert.call
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// CHECK:STDOUT: assign %x.var, %.loc12_3.2
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// CHECK:STDOUT: %X.ref: type = name_ref X, file.%X.decl [concrete = constants.%X]
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// CHECK:STDOUT: %x: ref %X = ref_binding x, %x.var
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// CHECK:STDOUT: %Destroy.Op.bound: <bound method> = bound_method %x.var, constants.%Destroy.Op.1a2547.2
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// CHECK:STDOUT: %Destroy.Op.call: init %empty_tuple.type = call %Destroy.Op.bound(%x.var)
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Destroy.Op.loc12_3.1(%self.param: ref %empty_struct_type) = "no_op";
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Destroy.Op.loc12_3.2(%self.param: ref %X) {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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