mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-29 21:54:54 +01:00
Geoff RomerandRichard Smith
e023f75254
The bulk of this change is changing most pattern insts to be `Always` rather than `AlwaysUnique` constants, so that they can be wrapped in `SpecificConstant`s to perform substitution. That then lets thunking rely much more on `SpecificConstant` wrappers instead of deep-copying the inst tree with modified types. This approach to thunking should scale better, particularly as things like form generics make function signatures more complex, because we can leverage the existing support for constant evaluation and substitution. Unfortunately, applying this approach to binding patterns will require more work; see the TODO near the top of `thunk.cpp` for details. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
156 lines
5.7 KiB
Plaintext
156 lines
5.7 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/destroy.carbon
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// EXTRA-ARGS: --clang-arg=-Wno-abstract-final-class
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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/interop/cpp/class/import/abstract.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/interop/cpp/class/import/abstract.carbon
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// --- abstract.h
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struct A {
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virtual void f() = 0;
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};
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// --- derive_base_from_abstract.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "abstract.h";
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base class B {
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extend base: Cpp.A;
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}
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// --- todo_fail_derive_final_from_abstract.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "abstract.h";
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class C {
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// TODO: We should reject this because `f` is not implemented.
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extend base: Cpp.A;
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}
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// --- impl_abstract_member.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "abstract.h";
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class C {
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extend base: Cpp.A;
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override fn f(unused ref self) {}
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}
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// --- fail_impl_mismatch_member.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "abstract.h";
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class C {
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extend base: Cpp.A;
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// CHECK:STDERR: fail_impl_mismatch_member.carbon:[[@LINE+4]]:3: error: override without compatible virtual in base class [OverrideWithoutVirtualInBase]
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// CHECK:STDERR: override fn invalid(unused ref self) {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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override fn invalid(unused ref self) {}
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}
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// --- abstract_final.h
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// C++ allows a class to be both abstract and final.
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struct AbstractFinal final {
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virtual void f() = 0;
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};
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// --- fail_derive_from_abstract_final.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "abstract_final.h";
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class C {
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// CHECK:STDERR: fail_derive_from_abstract_final.carbon:[[@LINE+4]]:16: error: deriving from final type `AbstractFinal`; base type must be an `abstract` or `base` class [BaseIsFinal]
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// CHECK:STDERR: extend base: Cpp.AbstractFinal;
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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extend base: Cpp.AbstractFinal;
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}
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// --- use_abstract_final.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "abstract_final.h";
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// We model an abstract final class as being final, rather than abstract. This
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// prevents inheritance from it, and there's no actual way to initialize an
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// instance of the type, but that does not prevent defining a function that
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// returns the type by value. Make sure that doesn't crash.
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//@dump-sem-ir-begin
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fn F() -> Cpp.AbstractFinal {
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return F();
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}
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//@dump-sem-ir-end
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// CHECK:STDOUT: --- use_abstract_final.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %AbstractFinal: type = class_type @AbstractFinal [concrete]
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// CHECK:STDOUT: %.dbd: Core.Form = init_form %AbstractFinal [concrete]
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// CHECK:STDOUT: %pattern_type: type = pattern_type %AbstractFinal [concrete]
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// CHECK:STDOUT: %return.param_patt: %pattern_type = out_param_pattern [concrete]
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// CHECK:STDOUT: %return.patt: %pattern_type = return_slot_pattern %return.param_patt, %AbstractFinal [concrete]
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// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
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// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
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// CHECK:STDOUT: %AbstractFinal.f.type: type = fn_type @AbstractFinal.f [concrete]
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// CHECK:STDOUT: %AbstractFinal.f: %AbstractFinal.f.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: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
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// CHECK:STDOUT: .AbstractFinal = %AbstractFinal.decl
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// CHECK:STDOUT: import Cpp//...
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %AbstractFinal.decl: type = class_decl @AbstractFinal [concrete = constants.%AbstractFinal] {} {}
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// CHECK:STDOUT: %AbstractFinal.f.decl: %AbstractFinal.f.type = fn_decl @AbstractFinal.f [concrete = constants.%AbstractFinal.f] {
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: } {
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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:
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// CHECK:STDOUT: file {
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// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
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// CHECK:STDOUT: %return.param_patt: %pattern_type = out_param_pattern [concrete = constants.%return.param_patt]
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// CHECK:STDOUT: %return.patt: %pattern_type = return_slot_pattern %return.param_patt, %AbstractFinal.ref [concrete = constants.%return.patt]
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// CHECK:STDOUT: } {
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// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
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// CHECK:STDOUT: %AbstractFinal.ref: type = name_ref AbstractFinal, imports.%AbstractFinal.decl [concrete = constants.%AbstractFinal]
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// CHECK:STDOUT: %.loc11_14.2: Core.Form = init_form %AbstractFinal.ref [concrete = constants.%.dbd]
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// CHECK:STDOUT: %return.param: ref %AbstractFinal = out_param call_param0
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// CHECK:STDOUT: %return: ref %AbstractFinal = return_slot %return.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: vtable @AbstractFinal.vtable {
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// CHECK:STDOUT: imports.%AbstractFinal.f.decl
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() -> out %return.param: %AbstractFinal {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
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// CHECK:STDOUT: %.loc11_14.1: ref %AbstractFinal = splice_block %return.param {}
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// CHECK:STDOUT: %F.call: init %AbstractFinal to %.loc11_14.1 = call %F.ref()
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// CHECK:STDOUT: return %F.call to %return.param
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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