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Add an interface for initialization of vars without an explicit initializer (#6934)
When a `var` is not explicitly given an initializer, initialize it in one of two ways: * If its type implements the new interface `Core.Default`, call `Core.Default.Op` to initialize it. * Otherwise, if its type implements `UnformedInit`, leave it in an unformed state. For now, this is always an uninitialized state, but that will change in the future. * If neither of those apply, the `var` declaration is ill-formed. This is a step towards implementing leads decision #6739 and proposals #257 and #5913. Assisted-by: Gemini 3.1 Pro via Antigravity --------- Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Richard Smith
co-authored by
Geoff Romer
Geoff Romer
parent
fd2d210c63
commit
ce50f181f1
@@ -3,8 +3,6 @@
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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/destroy.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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@@ -40,120 +38,13 @@ library "[[@TEST_NAME]]";
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fn F() {
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// CHECK:STDERR: fail_access.carbon:[[@LINE+4]]:3: error: `private` not allowed; requires class or file scope [ModifierPrivateNotAllowed]
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// CHECK:STDERR: private var unused v: {};
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// CHECK:STDERR: private var unused v: {} = {};
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// CHECK:STDERR: ^~~~~~~
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// CHECK:STDERR:
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private var unused v: {};
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private var unused v: {} = {};
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// CHECK:STDERR: fail_access.carbon:[[@LINE+4]]:3: error: `protected` not allowed; requires class scope [ModifierProtectedNotAllowed]
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// CHECK:STDERR: protected var unused w: {};
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// CHECK:STDERR: protected var unused w: {} = {};
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// CHECK:STDERR: ^~~~~~~~~
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// CHECK:STDERR:
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protected var unused w: {};
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protected var unused w: {} = {};
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}
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// CHECK:STDOUT: --- fail_virtual.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %F.type.117: type = fn_type @F.loc4 [concrete]
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// CHECK:STDOUT: %F.d98: %F.type.117 = struct_value () [concrete]
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// CHECK:STDOUT: %F.type.21a: type = fn_type @F.loc9 [concrete]
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// CHECK:STDOUT: %F.c14: %F.type.21a = struct_value () [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: %H.type: type = fn_type @H [concrete]
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// CHECK:STDOUT: %H: %H.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
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// CHECK:STDOUT: import Core//prelude
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// CHECK:STDOUT: import Core//prelude/...
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// CHECK:STDOUT: }
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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: .Core = imports.%Core
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// CHECK:STDOUT: .F = %F.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %Core.import = import Core
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// CHECK:STDOUT: %F.decl: %F.type.117 = fn_decl @F.loc4 [concrete = constants.%F.d98] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F.loc4() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %F.decl: %F.type.21a = fn_decl @F.loc9 [concrete = constants.%F.c14] {} {}
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// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {} {}
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// CHECK:STDOUT: %H.decl: %H.type = fn_decl @H [concrete = constants.%H] {} {}
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F.loc9();
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @G();
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @H();
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// CHECK:STDOUT:
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// CHECK:STDOUT: --- fail_access.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
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// CHECK:STDOUT: %pattern_type.a96: type = pattern_type %empty_struct_type [concrete]
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// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
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// CHECK:STDOUT: %Destroy.Op.type: type = fn_type @Destroy.Op [concrete]
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// CHECK:STDOUT: %Destroy.Op: %Destroy.Op.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
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// CHECK:STDOUT: .Destroy = %Core.Destroy
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// CHECK:STDOUT: import Core//prelude
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// CHECK:STDOUT: import Core//prelude/...
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
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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: .Core = imports.%Core
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// CHECK:STDOUT: .F = %F.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %Core.import = import Core
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// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %v.patt: %pattern_type.a96 = ref_binding_pattern v [concrete]
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// CHECK:STDOUT: %v.var_patt: %pattern_type.a96 = var_pattern %v.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %v.var: ref %empty_struct_type = var %v.var_patt
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// CHECK:STDOUT: %.loc9_26.1: type = splice_block %.loc9_26.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc9_26.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %.loc9_26.3: type = converted %.loc9_26.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %v: ref %empty_struct_type = ref_binding v, %v.var
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %w.patt: %pattern_type.a96 = ref_binding_pattern w [concrete]
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// CHECK:STDOUT: %w.var_patt: %pattern_type.a96 = var_pattern %w.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %w.var: ref %empty_struct_type = var %w.var_patt
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// CHECK:STDOUT: %.loc14_28.1: type = splice_block %.loc14_28.3 [concrete = constants.%empty_struct_type] {
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// CHECK:STDOUT: %.loc14_28.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
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// CHECK:STDOUT: %.loc14_28.3: type = converted %.loc14_28.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %w: ref %empty_struct_type = ref_binding w, %w.var
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// CHECK:STDOUT: %Destroy.Op.bound.loc14: <bound method> = bound_method %w.var, constants.%Destroy.Op
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// CHECK:STDOUT: %Destroy.Op.call.loc14: init %empty_tuple.type = call %Destroy.Op.bound.loc14(%w.var)
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// CHECK:STDOUT: %Destroy.Op.bound.loc9: <bound method> = bound_method %v.var, constants.%Destroy.Op
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// CHECK:STDOUT: %Destroy.Op.call.loc9: init %empty_tuple.type = call %Destroy.Op.bound.loc9(%v.var)
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Destroy.Op(%self.param: ref %empty_struct_type) = "no_op";
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// CHECK:STDOUT:
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