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https://github.com/carbon-language/carbon-lang.git
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David Blaikie
f1f6005d4a
Background: https://docs.google.com/document/d/1wi85FRiWh4X9A-gCYMVGKR40-q5fM6-3JaSpePk-XCY/edit?usp=sharing And specifically this work is essentially an alternative to #5543 Clang's code generation is implemented through an ASTListener (clang::CodeGenerator) that is attached throughout Clang's parsing/sema/code generation phases and acts on Clang AST incrementally throughout that process. Prior to this patch, Carbon has only created the CodeGenerator during Carbon's `lower` phase, missing out on key callbacks that would be made by Clang during `check`. Some of these issues were addressed by #6237 and #6483 - but there were still remaining cases where the delayed processing lead to missing functionality. With #6483 much of the Clang code that made multithreaded complexity of #5543 is no longer present, and we have access to the point of ASTListener registration so we can register the CodeGenerator there and consume its resulting llvm::Module during lower. Examples of some of the bugs this addresses are seen in the linked doc, and checked in as tests in this change in `clang_code_generator_callbacks.carbon` An indicental bug that's also fixed, and caused all the other test case churn, is that the `CodeGenerator` created during `lower` wasn't getting passed the Clang `CodeGenOpts` and was creating its own default - so, most notably, optimization flags were not respected. This meant that the LLVM IR from Clang was always -O0 style IR (optnone, no inlinehint, no TBAA, etc). With this change, now the Clang IRGen gets the real `CodeGenOpts` and respects optimization/other flags specified there. This is only meant to be a rough proof of concept - I'm totally open to reworking this in any way (even quite substantially) if folks have ideas about how this should be implemented most generally/elegantly/etc.
80 lines
3.7 KiB
C++
80 lines
3.7 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_IMPORT_H_
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#define CARBON_TOOLCHAIN_CHECK_CPP_IMPORT_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/convert.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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#include "toolchain/sem_ir/ids.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. Reports C++ errors
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// and warnings. If successful, adds a `Cpp` namespace.
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auto ImportCpp(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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llvm::LLVMContext* llvm_context,
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std::shared_ptr<clang::CompilerInvocation> invocation) -> void;
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// Imports a declaration from Clang to Carbon. If successful, returns the new
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// Carbon declaration `InstId`. If the declaration was already imported, returns
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// the mapped instruction. All unimported dependencies are imported first.
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auto ImportCppDecl(Context& context, SemIR::LocId loc_id,
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SemIR::ClangDeclKey key) -> SemIR::InstId;
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// Imports a function declaration from Clang to Carbon. If successful, returns
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// the new Carbon function declaration `InstId`. If the declaration was already
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// imported, returns the mapped instruction.
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inline auto ImportCppFunctionDecl(Context& context, SemIR::LocId loc_id,
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clang::FunctionDecl* clang_decl,
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int num_params) -> SemIR::InstId {
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return ImportCppDecl(
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context, loc_id,
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SemIR::ClangDeclKey::ForFunctionDecl(clang_decl, num_params));
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}
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// Imports a function declaration from Clang to Carbon. If successful, returns
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// the new Carbon function declaration `InstId`. If the declaration was already
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// imported, returns the mapped instruction. All unimported dependencies are
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// imported first.
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auto ImportCppType(Context& context, SemIR::LocId loc_id, clang::QualType type)
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-> TypeExpr;
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// Imports an overloaded function set from Clang to Carbon.
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auto ImportCppOverloadSet(
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Context& context, SemIR::LocId loc_id, SemIR::NameScopeId scope_id,
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SemIR::NameId name_id, clang::CXXRecordDecl* naming_class,
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clang::UnresolvedSet<4>&& overload_set,
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clang::OverloadCandidateSet::OperatorRewriteInfo operator_rewrite_info)
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-> SemIR::InstId;
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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. If using the injected class name (`X.X()`),
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// imports the class constructor as a function named as the class.
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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 Carbon class declaration that was imported from some kind of C++
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// declaration, such as a class or enum, attempt to import a corresponding class
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// definition. Returns true if nothing went wrong (whether or not a definition
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// could be imported), false if a diagnostic was produced.
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auto ImportClassDefinitionForClangDecl(Context& context, SemIR::LocId loc_id,
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SemIR::ClassId class_id,
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SemIR::ClangDeclId clang_decl_id)
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-> bool;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CPP_IMPORT_H_
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