diff options
Diffstat (limited to 'gcc/rust/expand/rust-macro-builtins.cc')
| -rw-r--r-- | gcc/rust/expand/rust-macro-builtins.cc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/gcc/rust/expand/rust-macro-builtins.cc b/gcc/rust/expand/rust-macro-builtins.cc index d0f7302..8c68a7d 100644 --- a/gcc/rust/expand/rust-macro-builtins.cc +++ b/gcc/rust/expand/rust-macro-builtins.cc @@ -376,4 +376,40 @@ MacroBuiltin::env (Location invoc_locus, AST::MacroInvocData &invoc) return AST::ASTFragment ({node}); } +AST::ASTFragment +MacroBuiltin::cfg (Location invoc_locus, AST::MacroInvocData &invoc) +{ + // only parse if not already parsed + if (!invoc.is_parsed ()) + { + std::unique_ptr<AST::AttrInputMetaItemContainer> converted_input ( + invoc.get_delim_tok_tree ().parse_to_meta_item ()); + + if (converted_input == nullptr) + { + rust_debug ("DEBUG: failed to parse macro to meta item"); + // TODO: do something now? is this an actual error? + } + else + { + std::vector<std::unique_ptr<AST::MetaItemInner>> meta_items ( + std::move (converted_input->get_items ())); + invoc.set_meta_item_output (std::move (meta_items)); + } + } + + /* TODO: assuming that cfg! macros can only have one meta item inner, like cfg + * attributes */ + if (invoc.get_meta_items ().size () != 1) + return AST::ASTFragment::create_error (); + + bool result = invoc.get_meta_items ()[0]->check_cfg_predicate ( + Session::get_instance ()); + auto literal_exp = AST::SingleASTNode (std::unique_ptr<AST::Expr> ( + new AST::LiteralExpr (result ? "true" : "false", AST::Literal::BOOL, + PrimitiveCoreType::CORETYPE_BOOL, {}, invoc_locus))); + + return AST::ASTFragment ({literal_exp}); +} + } // namespace Rust |