mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-02 16:35:49 +01:00
Richard Smith
ae16014df8
When importing a class definition, ask Clang to complete it first. This causes class template specializations to get instantiated as needed when the type-checking of Carbon requires a C++ class to be complete. It also allows Clang to implement things like modules-aware definition visibility checking. Don't reject importing a class with a virtual base if it's never required to be complete. Instead, defer diagnosing until the definition is required. This also removes the recursion from `MapType`, as mapping a class type no longer maps its definition. In order to get diagnostics from instantiation failures, fix a bug that caused any Clang diagnostics produced after the initial building of the `ASTUnit` to get discarded. This exposed some duplicate diagnostic issues in `ImportNameFromCpp` which are fixed here too.
43 lines
1.9 KiB
C++
43 lines
1.9 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_IMPORT_CPP_H_
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#define CARBON_TOOLCHAIN_CHECK_IMPORT_CPP_H_
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/IntrusiveRefCntPtr.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/VirtualFileSystem.h"
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#include "toolchain/check/context.h"
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#include "toolchain/check/diagnostic_helpers.h"
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#include "toolchain/diagnostics/diagnostic_emitter.h"
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namespace Carbon::Check {
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// Generates a C++ header that includes the imported cpp files, parses it,
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// generates the AST from it and links `SemIR::File` to it. Report C++ errors
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// and warnings. If successful, adds a `Cpp` namespace and returns the AST.
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auto ImportCppFiles(Context& context,
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llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
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std::shared_ptr<clang::CompilerInvocation> invocation)
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-> std::unique_ptr<clang::ASTUnit>;
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// Looks up the given name in the Clang AST generated when importing C++ code
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// and returns a lookup result.
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auto ImportNameFromCpp(Context& context, SemIR::LocId loc_id,
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SemIR::NameScopeId scope_id, SemIR::NameId name_id)
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-> SemIR::ScopeLookupResult;
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// Given a class declaration that was imported from C++, attempt to import a
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// corresponding class definition. Returns true if nothing went wrong (whether
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// or not a definition could be imported), false if a diagnostic was produced.
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auto ImportCppClassDefinition(Context& context, SemIR::LocId loc_id,
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SemIR::ClassId class_id,
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SemIR::ClangDeclId clang_decl_id) -> bool;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_IMPORT_CPP_H_
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