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https://github.com/carbon-language/carbon-lang.git
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David Blaikie
0f5de499d6
Roundtrip (export/reimport) class declarations The remapping was previously implemented using name_scopes, which aren't created for class declarations, only definitions - causing the reimport to import a fresh copy of the type that mismatched with the original (as seen in the test baseline). By changing the mapping to use the reverse part of the clang_decls mapping this should generalize better (& we probably should further migrate to that mapping). Though it did trip over some issue with exactly which instruction is used as the key in the clang_decls map - this change moves towards standardizing on the first decl id of the class as its map key.
70 lines
2.8 KiB
C++
70 lines
2.8 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_EXPORT_H_
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#define CARBON_TOOLCHAIN_CHECK_CPP_EXPORT_H_
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#include "clang/AST/Decl.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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// Exports a Carbon name scope into C++ as a namespace or class, or returns the
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// C++ namespace or class declaration that it was imported from.
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//
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// If the name scope has already been exported, returns the existing context.
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// Otherwise, creates a new C++ declaration context and returns it. Returns
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// nullptr if the name scope could not be exported and an error was diagnosed.
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auto ExportNameScopeToCpp(Context& context, SemIR::LocId loc_id,
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SemIR::NameScopeId name_scope_id)
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-> clang::DeclContext*;
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// Exports a Carbon class into C++ as a class, or returns the C++ tag type that
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// the class was imported from.
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//
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// If the class has already been exported, returns the existing C++ class.
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// Otherwise, creates a new C++ class and returns it. Returns nullptr if the
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// class could not be exported and an error was diagnosed.
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auto ExportClassToCpp(Context& context, SemIR::LocId loc_id,
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SemIR::ClassType class_type) -> clang::TagDecl*;
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// Export all `SemIR::FieldDecl`s in the class body as `clang::FieldDecl`s.
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auto ExportAllFieldsToCpp(Context& context, SemIR::Class& class_info) -> void;
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// Exports a Carbon class field into C++.
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//
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// If the field has already been exported, returns the existing C++
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// field.
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//
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// If the field has not already been exported, *all* fields of the class
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// are exported, and then the requested C++ field is returned.
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//
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// Returns nullptr if the class could not be exported and an error was
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// diagnosed.
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auto ExportFieldToCpp(Context& context, SemIR::InstId field_inst_id,
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SemIR::FieldDecl field_decl) -> clang::FieldDecl*;
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// Get the field offset for each field in a class.
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//
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// Returns true on success, false if any error occurs.
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auto CalculateCppFieldOffsets(
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Context& context, SemIR::ClassId class_id,
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llvm::DenseMap<const clang::FieldDecl*, uint64_t>& field_offsets) -> bool;
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// Get a `clang::FunctionDecl` that can be used to call a Carbon function.
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auto ExportFunctionToCpp(Context& context, SemIR::LocId loc_id,
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SemIR::FunctionId function_id) -> clang::FunctionDecl*;
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// Export a Carbon destructor into C++.
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//
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// The destructor calls the `Destroy` operator.
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auto ExportDestructorToCpp(Context& context, const SemIR::Class& class_info,
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clang::CXXRecordDecl* record_decl)
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-> clang::CXXDestructorDecl*;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CPP_EXPORT_H_
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