mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-27 12:40:09 +01:00
Nicholas Bishop
0075d530b9
This makes it possible to do const eval when calling a constexpr C++ function with params and return types other than 32/64-bit integers. Most of the new logic is in `MaybeModifyCppThunkCallForConstEval`, which is called by `MakeConstantForCall`. This checks if the callee is a C++ thunk (using a new `SpecialFunctionKind::CppThunk` variant), and if so it: * Changes the callee from the C++ thunk to the thunk's callee * Remaps parameters that are passed by pointer to the thunk to the underlying value * Drops the return value parameter, if present
46 lines
1.7 KiB
C++
46 lines
1.7 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_CPP_CONSTANT_H_
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#define CARBON_TOOLCHAIN_CHECK_CPP_CONSTANT_H_
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#include <optional>
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#include "clang/AST/APValue.h"
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#include "toolchain/check/context.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Check {
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// Converts an `APValue` to a Carbon `ConstantId`.
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auto MapAPValueToConstant(Context& context, SemIR::LocId loc_id,
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const clang::APValue& ap_value, clang::QualType type,
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bool is_lvalue) -> SemIR::ConstantId;
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// Converts a Carbon constant instruction to an `APValue`.
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auto MapConstantToAPValue(Context& context, SemIR::InstId const_inst_id,
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clang::QualType param_type)
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-> std::optional<clang::APValue>;
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// Attempt to evaluate a C++ constexpr variable as a Carbon constant.
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auto EvalCppVarDecl(Context& context, SemIR::LocId loc_id,
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const clang::VarDecl* var_decl, SemIR::TypeId type_id)
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-> SemIR::ConstantId;
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// Attempt to evaluate a call to a C++ constexpr/consteval function as a
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// Carbon constant.
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auto EvalCppCall(Context& context, SemIR::LocId loc_id,
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SemIR::ClangDeclId clang_decl_id, SemIR::InstBlockId args_id)
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-> SemIR::ConstantId;
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// If the callee is a C++ thunk, modify `call` to directly call the
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// callee of the C++ thunk. Otherwise, does nothing and leaves `call`
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// unmodified.
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auto MaybeModifyCppThunkCallForConstEval(Context& context, SemIR::Call* call)
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-> void;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CPP_CONSTANT_H_
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