carbon-language/carbon-lang
1
0
Fork 0
mirror of https://github.com/carbon-language/carbon-lang.git synced 2026-10-04 22:02:52 +01:00
Code Issues Packages Projects Releases 10 Wiki Activity

Reverse Interop: Class declarations

Browse Source 
Generate class declarations for Carbon classes referenced from C++
This commit is contained in:
David Blaikie
2026-03-24 12:43:46 +00:00
parent 801785ec39
commit eb62070a01
3 changed files with 118 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
toolchain/check/cpp/generate_ast.cpp
+35 -19
View File
@@ -25,8 +25,10 @@
#include "llvm/ADT/IntrusiveRefCntPtr.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/raw_ostream.h"
#include "toolchain/base/kind_switch.h"
#include "toolchain/check/context.h"
#include "toolchain/check/cpp/import.h"
#include "toolchain/check/import_ref.h"
#include "toolchain/check/name_lookup.h"
#include "toolchain/diagnostics/diagnostic.h"
#include "toolchain/diagnostics/emitter.h"
@@ -384,26 +386,40 @@ auto CarbonExternalASTSource::MapInstIdToClangDecl(
clang::DeclContext& decl_context, LookupResult lookup)
-> clang::NamedDecl* {
auto target_inst_id = lookup.scope_result.target_inst_id();
if (auto target_inst =
context_->insts().TryGetAs<SemIR::Namespace>(target_inst_id)) {
auto& name_scope = context_->name_scopes().Get(target_inst->name_scope_id);
auto* identifier_info =
GetClangIdentifierInfo(*context_, name_scope.name_id());
// TODO: Don't immediately use the decl_context - build any intermediate
// namespaces iteratively.
// Eventually add a mapping and use that/populate it/keep it up to date.
// decl_context could be prepopulated in that mapping and not passed
// explicitly to MapInstIdToClangDecl.
auto* namespace_decl = clang::NamespaceDecl::Create(
*ast_context_, &decl_context, false, clang::SourceLocation(),
clang::SourceLocation(), identifier_info, nullptr, false);
auto result =
scope_map_.Insert(namespace_decl->getPrimaryContext(), target_inst_id);
CARBON_CHECK(result.is_inserted(), "Inserting over an existing entry.");
namespace_decl->setHasExternalVisibleStorage();
return namespace_decl;
auto target_constant =
context_->constant_values().GetConstantInstId(target_inst_id);
auto target_inst = context_->insts().Get(target_constant);
CARBON_KIND_SWITCH(target_inst) {
case CARBON_KIND(SemIR::Namespace namespace_info): {
auto& name_scope =
context_->name_scopes().Get(namespace_info.name_scope_id);
auto* identifier_info =
GetClangIdentifierInfo(*context_, name_scope.name_id());
// TODO: Don't immediately use the decl_context - build any intermediate
// namespaces iteratively.
// Eventually add a mapping and use that/populate it/keep it up to date.
// decl_context could be prepopulated in that mapping and not passed
// explicitly to MapInstIdToClangDecl.
auto* namespace_decl = clang::NamespaceDecl::Create(
*ast_context_, &decl_context, false, clang::SourceLocation(),
clang::SourceLocation(), identifier_info, nullptr, false);
auto result = scope_map_.Insert(namespace_decl->getPrimaryContext(),
target_inst_id);
CARBON_CHECK(result.is_inserted(), "Inserting over an existing entry.");
namespace_decl->setHasExternalVisibleStorage();
return namespace_decl;
}
case CARBON_KIND(SemIR::ClassType class_type): {
const auto& class_info = context_->classes().Get(class_type.class_id);
auto* identifier_info =
GetClangIdentifierInfo(*context_, class_info.name_id);
return clang::CXXRecordDecl::Create(
*ast_context_, clang::TagTypeKind::Class, &decl_context,
clang::SourceLocation(), clang::SourceLocation(), identifier_info);
}
default:
return nullptr;
}
return nullptr;
}
auto CarbonExternalASTSource::FindExternalVisibleDeclsByName(