mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 06:30:09 +01:00
Richard Smith
e06eb8f532
Instead of injecting code to declare an `operator new`, generate AST for it directly. In order to use this, directly generate a `CXXNewExpr` rather than asking Clang to build one. This is less of a hack, and doesn't visibly leak an `operator new` declaration that inline C++ code or template instantiations might see. It also avoids generating a warning in C++26 and later that the `constexpr` declaration of `operator new` is used but not defined. Assisted-by: Gemini 3.1 Pro via Antigravity
71 lines
2.1 KiB
C++
71 lines
2.1 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_CONTEXT_H_
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#define CARBON_TOOLCHAIN_CHECK_CPP_CONTEXT_H_
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#include <memory>
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#include "clang/Basic/SourceLocation.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/FrontendAction.h"
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#include "clang/Parse/Parser.h"
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#include "common/check.h"
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#include "llvm/ADT/SmallVector.h"
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namespace Carbon::Check {
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// Context for C++ code during check.
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//
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// This stores state for a Clang AST and Sema, as well as any additional
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// information needed to perform mapping between Carbon and C++ types,
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// declarations, and similar values.
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class CppContext {
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public:
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explicit CppContext(clang::CompilerInstance& instance,
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std::unique_ptr<clang::Parser> parser);
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~CppContext();
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auto ast_context() -> clang::ASTContext& { return *ast_context_; }
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auto sema() -> clang::Sema& { return *sema_; }
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auto parser() -> clang::Parser& { return *parser_; }
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auto clang_mangle_context() -> clang::MangleContext&;
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auto carbon_file_locations() -> llvm::SmallVector<clang::SourceLocation>& {
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return carbon_file_locations_;
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}
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auto placement_new_decl() const -> clang::FunctionDecl* {
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return placement_new_decl_;
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}
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void set_placement_new_decl(clang::FunctionDecl* decl) {
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placement_new_decl_ = decl;
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}
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private:
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// The Clang AST context.
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clang::ASTContext* ast_context_;
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// The Clang semantic analysis engine.
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clang::Sema* sema_;
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// The Clang parser.
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std::unique_ptr<clang::Parser> parser_;
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// Per-Carbon-file start locations for corresponding Clang source buffers.
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// Owned and managed by code in location.cpp.
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llvm::SmallVector<clang::SourceLocation> carbon_file_locations_;
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// The Clang mangle context for the target in the ASTContext.
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std::unique_ptr<clang::MangleContext> clang_mangle_context_;
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// The cached placement new function declaration.
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clang::FunctionDecl* placement_new_decl_ = nullptr;
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};
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CPP_CONTEXT_H_
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