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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-30 09:45:02 +01:00
Richard Smith
c33fb9fc48
For now, hide `override fn`s from name lookup, so that the base class version is always used, as the derived-class version does not have its own vptr entry and so would not do the right thing if a further-derived class adds a new override. This is implemented via a new access kind of `Hidden`. When checking the overriding function, pass in the expected `Self` type and check the `self` parameter against that; the signature that we generate for the thunk in the derived class is the base class signature with the `self` parameter's type changed to the derived class. When we generate a thunk for a virtual function, the thunk is assigned a `virtual_index`, and the virtual function itself is not. When the thunk makes a direct call to the virtual function, recognize this situation by checking for a `virtual_index`, and perform a non-virtual call if there isn't one. Assisted-by: Gemini via Antigravity
57 lines
2.6 KiB
C++
57 lines
2.6 KiB
C++
// 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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#ifndef CARBON_TOOLCHAIN_CHECK_THUNK_H_
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#define CARBON_TOOLCHAIN_CHECK_THUNK_H_
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#include "toolchain/check/context.h"
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#include "toolchain/check/deferred_definition_worklist.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Check {
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// Given a function signature and a callee function, build a thunk that matches
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// the given signature and calls the specified callee. Returns the callee
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// unchanged if it can be used directly.
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auto BuildThunk(Context& context, SemIR::FunctionId signature_id,
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SemIR::SpecificId signature_specific_id,
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SemIR::TypeId signature_self_type_override_id,
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SemIR::InstId callee_id, bool defer_definition)
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-> SemIR::InstId;
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// Builds a call to a function that forwards a call argument list built for
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// `function_id` to a call to `callee_id`, for use when building a call from a
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// thunk to its target. This is like `PerformCall`, except that it takes a list
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// of call arguments for `function_id`, not a syntactic argument list.
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auto PerformThunkCall(Context& context, SemIR::LocId loc_id,
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SemIR::FunctionId function_id,
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llvm::ArrayRef<SemIR::InstId> param_pattern_ids,
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llvm::ArrayRef<SemIR::InstId> call_arg_ids,
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SemIR::InstId callee_id) -> SemIR::InstId;
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// Builds the definition for a thunk whose definition was deferred until the end
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// of the enclosing scope.
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auto BuildThunkDefinition(Context& context,
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DeferredDefinitionWorklist::DefineThunk&& task)
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-> void;
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// Given a declaration of a thunk and the function that it should call,
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// build a thunk body for calling a Carbon function from a C++
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// function. If the callee has a return value, the thunk returns it
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// through an explicit output parameter at the end of the parameter
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// list.
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auto BuildThunkDefinitionForExport(Context& context,
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SemIR::FunctionId thunk_function_id,
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SemIR::FunctionId callee_function_id,
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SemIR::InstId thunk_id,
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SemIR::InstId callee_id) -> void;
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// Build a function that destroys an object of the given class.
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auto BuildDestroyThunk(Context& context, SemIR::LocId loc_id,
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const SemIR::Class& class_info) -> SemIR::FunctionId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_THUNK_H_
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