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[interop][SwiftToCxx] Annotate emitted declarations with Clang's external_source_symbol attribute

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Each emitted declaration is annotated with the external_source_symbol with its own USR, to allow Clang's indexer to recognize this declaration as a Swift declaration with a specific USR
This commit is contained in:
Alex Lorenz
2023-01-12 12:14:26 -08:00
parent 1d7c0ee7a5
commit 3b3d6c825a
58 changed files with 481 additions and 401 deletions
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12
lib/PrintAsClang/ModuleContentsWriter.cpp
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@@ -788,6 +788,14 @@ EmittedClangHeaderDependencyInfo swift::printModuleContentsAsCxx(
llvm::raw_string_ostream prologueOS{modulePrologueBuf};
EmittedClangHeaderDependencyInfo info;
// Define the `SWIFT_SYMBOL` macro.
os << "#ifdef SWIFT_SYMBOL\n";
os << "#undef SWIFT_SYMBOL\n";
os << "#endif\n";
os << "#define SWIFT_SYMBOL(usrValue) SWIFT_SYMBOL_MODULE_USR(\"";
ClangSyntaxPrinter(os).printBaseName(&M);
os << "\", usrValue)\n";
// FIXME: Use getRequiredAccess once @expose is supported.
ModuleWriter writer(moduleOS, prologueOS, info.imports, M, interopContext,
AccessLevel::Public, requiresExposedAttribute,
@@ -824,6 +832,7 @@ EmittedClangHeaderDependencyInfo swift::printModuleContentsAsCxx(
os << "namespace ";
M.ValueDecl::getName().print(os);
os << " __attribute__((swift_private))";
ClangSyntaxPrinter(os).printSymbolUSRAttribute(&M);
os << " {\n";
os << "namespace " << cxx_synthesis::getCxxImplNamespaceName() << " {\n";
os << "extern \"C\" {\n";
@@ -842,10 +851,11 @@ EmittedClangHeaderDependencyInfo swift::printModuleContentsAsCxx(
ClangSyntaxPrinter(os).printNamespace(
[&](raw_ostream &os) { M.ValueDecl::getName().print(os); },
[&](raw_ostream &os) { os << moduleOS.str(); },
ClangSyntaxPrinter::NamespaceTrivia::AttributeSwiftPrivate);
ClangSyntaxPrinter::NamespaceTrivia::AttributeSwiftPrivate, &M);
if (M.isStdlibModule()) {
os << "#pragma clang diagnostic pop\n";
}
os << "#undef SWIFT_SYMBOL\n";
return info;
}