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[interop][SwiftToCxx] make it possible to convert Swift String to a std::string in C++

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This is done by exposing nested Index and UTF8View type in String. Nested types aren't
supported yet, so we need to employ a number of hacks to emit them.
This commit is contained in:
Alex Lorenz
2022-12-14 16:22:16 -08:00
parent 5c703b4f5c
commit 28af8bef55
7 changed files with 129 additions and 0 deletions
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26
lib/PrintAsClang/ModuleContentsWriter.cpp
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@@ -612,6 +612,25 @@ public:
});
decls.erase(newEnd, decls.end());
if (M.isStdlibModule()) {
llvm::SmallVector<Decl *, 2> nestedAdds;
for (const auto *d : decls) {
auto *ext = dyn_cast<ExtensionDecl>(d);
if (!ext ||
ext->getExtendedNominal() != M.getASTContext().getStringDecl())
continue;
for (auto *m : ext->getMembers()) {
if (auto *sd = dyn_cast<StructDecl>(m)) {
if (sd->getBaseIdentifier().str() == "UTF8View" ||
sd->getBaseIdentifier().str() == "Index") {
nestedAdds.push_back(sd);
}
}
}
}
decls.append(nestedAdds);
}
// REVERSE sort the decls, since we are going to copy them onto a stack.
llvm::array_pod_sort(decls.begin(), decls.end(),
[](Decl * const *lhs, Decl * const *rhs) -> int {
@@ -783,6 +802,9 @@ EmittedClangHeaderDependencyInfo swift::printModuleContentsAsCxx(
// Embed an overlay for the standard library.
ClangSyntaxPrinter(moduleOS).printIncludeForShimHeader(
"_SwiftStdlibCxxOverlay.h");
// Ignore typos in Swift stdlib doc comments.
os << "#pragma clang diagnostic push\n";
os << "#pragma clang diagnostic ignored \"-Wdocumentation\"\n";
}
os << "#ifndef SWIFT_PRINTED_CORE\n";
@@ -820,5 +842,9 @@ EmittedClangHeaderDependencyInfo swift::printModuleContentsAsCxx(
[&](raw_ostream &os) { M.ValueDecl::getName().print(os); },
[&](raw_ostream &os) { os << moduleOS.str(); },
ClangSyntaxPrinter::NamespaceTrivia::AttributeSwiftPrivate);
if (M.isStdlibModule()) {
os << "#pragma clang diagnostic pop\n";
}
return info;
}