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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>
89 lines
4.1 KiB
Plaintext
89 lines
4.1 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/none.carbon
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// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
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// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
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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/class/access/method_access.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/class/access/method_access.carbon
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// --- fail_multiple_bindings.carbon
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class X {
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fn F(self);
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}
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fn G(x: X) {
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// TODO: Produce a better diagnostic for this case.
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// CHECK:STDERR: fail_multiple_bindings.carbon:[[@LINE+4]]:3: error: member name of type `<bound method>` in compound member access is not an instance member or an interface member [CompoundMemberAccessDoesNotUseBase]
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// CHECK:STDERR: x.(x.F)();
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// CHECK:STDERR: ^~~~~~~
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// CHECK:STDERR:
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x.(x.F)();
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}
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// CHECK:STDOUT: --- fail_multiple_bindings.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: %pattern_type: type = pattern_type %X [concrete]
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// CHECK:STDOUT: %X.F.type: type = fn_type @X.F [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %X.F: %X.F.type = struct_value () [concrete]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
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// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
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// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
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// CHECK:STDOUT: .X = %X.decl
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// CHECK:STDOUT: .G = %G.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %X.decl: type = class_decl @X [concrete = constants.%X] {} {}
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// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
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// CHECK:STDOUT: %x.param_patt: %pattern_type = value_param_pattern [concrete]
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// CHECK:STDOUT: %x.patt: %pattern_type = at_binding_pattern x, %x.param_patt [concrete]
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// CHECK:STDOUT: } {
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// CHECK:STDOUT: %x.param: %X = value_param call_param0
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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: %X = value_binding x, %x.param
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// CHECK:STDOUT: }
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: class @X {
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// CHECK:STDOUT: %X.F.decl: %X.F.type = fn_decl @X.F [concrete = constants.%X.F] {
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// CHECK:STDOUT: %self.param_patt: %pattern_type = value_param_pattern [concrete]
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// CHECK:STDOUT: %self.patt: %pattern_type = at_binding_pattern self, %self.param_patt [concrete]
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// CHECK:STDOUT: } {
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// CHECK:STDOUT: %self.param: %X = value_param call_param0
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// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%X [concrete = constants.%X]
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// CHECK:STDOUT: %self: %X = value_binding self, %self.param
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
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// CHECK:STDOUT: complete_type_witness = %complete_type
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// CHECK:STDOUT:
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// CHECK:STDOUT: !members:
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// CHECK:STDOUT: .Self = constants.%X
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// CHECK:STDOUT: .F = %X.F.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @X.F(%self.param: %X);
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @G(%x.param: %X) {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %x.ref.loc12_3: %X = name_ref x, %x
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// CHECK:STDOUT: %x.ref.loc12_6: %X = name_ref x, %x
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// CHECK:STDOUT: %F.ref: %X.F.type = name_ref F, @X.%X.F.decl [concrete = constants.%X.F]
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// CHECK:STDOUT: %X.F.bound: <bound method> = bound_method %x.ref.loc12_6, %F.ref
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// CHECK:STDOUT: %X.F.call: init %empty_tuple.type = call %X.F.bound(%x.ref.loc12_6)
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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