mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-28 22:02:37 +01:00
Richard Smith
7d89ac98c7
Instead of building one Clang `ASTContext` per compilation, the `--share-cpp-ast` flag causes us to build a single `ASTContext` and share it across all contexts. One new abstraction is added: `CppDomain` represents the Carbon-side view of a Clang AST that might be shared across multiple `SemIR::File`s. This object owns the Clang instance and the AST. For now, we have no isolation between the C++ state exposed to different Carbon compilations, and we have no multiplexing of generated LLVM IR from C++ into different Carbon compilations, so the mode is not usable yet. The plan is to keep it behind a flag until it's ready. Assisted-by: Gemini via Antigravity
73 lines
2.6 KiB
C++
73 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_CPP_GENERATE_AST_H_
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#define CARBON_TOOLCHAIN_CHECK_CPP_GENERATE_AST_H_
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#include <memory>
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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/parse/tree.h"
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#include "toolchain/sem_ir/ids.h"
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namespace clang {
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class CompilerInvocation;
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class CompilerInstance;
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class Parser;
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class ExternalSemaSource;
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class CodeGenerator;
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} // namespace clang
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namespace Carbon::Diagnostics {
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class Consumer;
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} // namespace Carbon::Diagnostics
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namespace Carbon::Check {
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// A C++ compilation domain, including a live Clang instance that can be used to
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// parse more code into that domain. May be shared across multiple Carbon files.
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struct CppDomain {
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std::shared_ptr<clang::CompilerInstance> clang_instance;
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std::shared_ptr<clang::Parser> parser;
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clang::CodeGenerator* code_generator = nullptr;
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llvm::LLVMContext* llvm_context = nullptr;
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};
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// Initializes a Clang compilation instance, which can be used to parse C++ code
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// within one or more Carbon files. Returns the initialized state, or null on
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// failure.
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auto InitializeCppDomain(
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Diagnostics::Consumer& consumer, llvm::StringRef filename,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
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llvm::LLVMContext* llvm_context,
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std::shared_ptr<clang::CompilerInvocation> base_invocation)
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-> std::shared_ptr<CppDomain>;
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// Generates a Clang AST for the given C++ imports and sets it as the context's
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// `cpp_context` and the SemIR's `cpp_file`. Returns a bool that represents
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// whether compilation was successful.
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auto GenerateAst(Context& context,
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llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
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CppDomain& domain) -> bool;
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// Injects C++ code from `inline Cpp` into the active Clang AST context.
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// Returns a bool representing whether parsing was successful.
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auto InjectAstFromInlineCode(Context& context, SemIR::LocId loc_id,
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llvm::StringRef source_code) -> void;
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// Finishes AST generation for the given checking context. Performs end of file
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// steps such as template instantiation and warning on unused declarations.
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auto FinishAst(Context& context) -> void;
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// Finalizes a C++ domain at the end of checking all files.
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auto FinalizeCppDomain(CppDomain& domain) -> void;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CPP_GENERATE_AST_H_
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