LCOV - code coverage report
Current view: top level - gcc/rust/expand - rust-macro-builtins-format-args.cc (source / functions) Coverage Total Hit
Test: gcc.info Lines: 77.9 % 68 53
Test Date: 2026-02-28 14:20:25 Functions: 100.0 % 3 3
Legend: Lines:     hit not hit

            Line data    Source code
       1              : // Copyright (C) 2020-2026 Free Software Foundation, Inc.
       2              : 
       3              : // This file is part of GCC.
       4              : 
       5              : // GCC is free software; you can redistribute it and/or modify it under
       6              : // the terms of the GNU General Public License as published by the Free
       7              : // Software Foundation; either version 3, or (at your option) any later
       8              : // version.
       9              : 
      10              : // GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      11              : // WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12              : // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      13              : // for more details.
      14              : 
      15              : // You should have received a copy of the GNU General Public License
      16              : // along with GCC; see the file COPYING3.  If not see
      17              : // <http://www.gnu.org/licenses/>.
      18              : #include "rust-ast-fragment.h"
      19              : #include "rust-fmt.h"
      20              : #include "rust-macro-builtins-helpers.h"
      21              : #include "rust-expand-format-args.h"
      22              : 
      23              : namespace Rust {
      24              : 
      25              : struct FormatArgsInput
      26              : {
      27              :   std::string format_str;
      28              :   AST::FormatArguments args;
      29              :   // bool is_literal?
      30              : };
      31              : 
      32              : struct FormatArgsParseError
      33              : {
      34              :   enum class Kind
      35              :   {
      36              :     MissingArguments
      37              :   } kind;
      38              : };
      39              : 
      40              : static inline tl::expected<std::string, AST::Fragment>
      41            4 : format_args_parse_expr (location_t invoc_locus, AST::MacroInvocData &invoc,
      42              :                         Parser<MacroInvocLexer> &parser,
      43              :                         BuiltinMacro macro_kind)
      44              : {
      45            4 :   auto format_expr_res = parser.parse_expr ();
      46            4 :   rust_assert (format_expr_res);
      47            4 :   auto format_expr = std::move (format_expr_res.value ());
      48              : 
      49            4 :   if (format_expr->get_expr_kind () == AST::Expr::Kind::MacroInvocation)
      50              :     {
      51            1 :       std::vector<std::unique_ptr<AST::MacroInvocation>> pending;
      52            1 :       pending.emplace_back (
      53            1 :         static_cast<AST::MacroInvocation *> (format_expr.release ()));
      54            2 :       return tl::unexpected<AST::Fragment> (
      55            2 :         make_eager_builtin_invocation (macro_kind, invoc_locus,
      56            1 :                                        invoc.get_delim_tok_tree (),
      57            1 :                                        std::move (pending)));
      58            1 :     }
      59              : 
      60              :   // TODO(Arthur): Clean this up - if we haven't parsed a string literal but a
      61              :   // macro invocation, what do we do here? return a tl::unexpected?
      62            3 :   rust_assert (format_expr->is_literal ());
      63            3 :   return static_cast<AST::LiteralExpr &> (*format_expr)
      64            3 :     .get_literal ()
      65            3 :     .as_string ();
      66            4 : }
      67              : 
      68              : static inline tl::expected<AST::FormatArguments, FormatArgsParseError>
      69            3 : format_args_parse_arguments (AST::MacroInvocData &invoc,
      70              :                              Parser<MacroInvocLexer> &parser,
      71              :                              TokenId last_token_id)
      72              : {
      73              :   // TODO: check if EOF - return that format_args!() requires at least one
      74              :   // argument
      75              : 
      76            3 :   auto args = AST::FormatArguments ();
      77              :   // TODO: Allow implicit captures ONLY if the the first arg is a string literal
      78              :   // and not a macro invocation
      79              : 
      80              :   // TODO: How to consume all of the arguments until the delimiter?
      81              : 
      82              :   // TODO: What we then want to do is as follows:
      83              :   // for each token, check if it is an identifier
      84              :   //     yes? is the next token an equal sign (=)
      85              :   //          yes?
      86              :   //              -> if that identifier is already present in our map, error
      87              :   //              out
      88              :   //              -> parse an expression, return a FormatArgument::Named
      89              :   //     no?
      90              :   //         -> if there have been named arguments before, error out
      91              :   //         (positional after named error)
      92              :   //         -> parse an expression, return a FormatArgument::Normal
      93           14 :   while (parser.peek_current_token ()->get_id () != last_token_id)
      94              :     {
      95            5 :       parser.skip_token (COMMA);
      96              : 
      97              :       // Check in case of an extraneous comma in the args list, which is
      98              :       // allowed - format_args!("fmt", arg, arg2,)
      99           10 :       if (parser.peek_current_token ()->get_id () == last_token_id)
     100              :         break;
     101              : 
     102            4 :       if (parser.peek_current_token ()->get_id () == IDENTIFIER
     103            4 :           && parser.peek (1)->get_id () == EQUAL)
     104              :         {
     105              :           // FIXME: This is ugly - just add a parser.parse_identifier()?
     106            0 :           auto ident_tok = parser.peek_current_token ();
     107            0 :           auto ident = Identifier (ident_tok);
     108              : 
     109            0 :           parser.skip_token (IDENTIFIER);
     110            0 :           parser.skip_token (EQUAL);
     111              : 
     112            0 :           auto expr = parser.parse_expr ();
     113              : 
     114              :           // TODO: Handle graciously
     115            0 :           if (!expr)
     116            0 :             rust_unreachable ();
     117              : 
     118            0 :           args.push (
     119            0 :             AST::FormatArgument::named (ident, std::move (expr.value ())));
     120            0 :         }
     121              :       else
     122              :         {
     123            4 :           auto expr = parser.parse_expr ();
     124              : 
     125              :           // TODO: Handle graciously
     126            4 :           if (!expr)
     127            0 :             rust_unreachable ();
     128              : 
     129            4 :           args.push (AST::FormatArgument::normal (std::move (expr.value ())));
     130            4 :         }
     131              :       // we need to skip commas, don't we?
     132              :     }
     133              : 
     134            3 :   return args;
     135            3 : }
     136              : 
     137              : tl::optional<AST::Fragment>
     138            4 : MacroBuiltin::format_args_handler (location_t invoc_locus,
     139              :                                    AST::MacroInvocData &invoc,
     140              :                                    AST::InvocKind semicolon,
     141              :                                    AST::FormatArgs::Newline nl)
     142              : {
     143            4 :   MacroInvocLexer lex (invoc.get_delim_tok_tree ().to_token_stream ());
     144            4 :   Parser<MacroInvocLexer> parser (lex);
     145              : 
     146            4 :   auto last_token_id = macro_end_token (invoc.get_delim_tok_tree (), parser);
     147              : 
     148            4 :   auto format_str = format_args_parse_expr (invoc_locus, invoc, parser,
     149              :                                             nl == AST::FormatArgs::Newline::Yes
     150              :                                               ? BuiltinMacro::FormatArgsNl
     151            8 :                                               : BuiltinMacro::FormatArgs);
     152              : 
     153            4 :   if (!format_str)
     154              :     {
     155            1 :       return std::move (format_str.error ());
     156              :     }
     157              : 
     158            3 :   auto args = format_args_parse_arguments (invoc, parser, last_token_id);
     159              : 
     160            3 :   if (!args)
     161              :     {
     162            0 :       rust_error_at (invoc_locus,
     163              :                      "could not parse arguments to %<format_args!()%>");
     164            0 :       return tl::nullopt;
     165              :     }
     166              : 
     167              :   // TODO(Arthur): We need to handle this
     168              :   // // if it is not a literal, it's an eager macro invocation - return it
     169              :   // if (!fmt_expr->is_literal ())
     170              :   //   {
     171              :   //     auto token_tree = invoc.get_delim_tok_tree ();
     172              :   //     return AST::Fragment ({AST::SingleASTNode (std::move (fmt_expr))},
     173              :   //        token_tree.to_token_stream ());
     174              :   //   }
     175              : 
     176              :   // TODO(Arthur): Handle this as well - raw strings are special for the
     177              :   // format_args parser auto fmt_str = static_cast<AST::LiteralExpr &>
     178              :   // (*fmt_arg.get ()); Switch on the format string to know if the string is raw
     179              :   // or cooked switch (fmt_str.get_lit_type ())
     180              :   //   {
     181              :   //   // case AST::Literal::RAW_STRING:
     182              :   //   case AST::Literal::STRING:
     183              :   //     break;
     184              :   //   case AST::Literal::CHAR:
     185              :   //   case AST::Literal::BYTE:
     186              :   //   case AST::Literal::BYTE_STRING:
     187              :   //   case AST::Literal::INT:
     188              :   //   case AST::Literal::FLOAT:
     189              :   //   case AST::Literal::BOOL:
     190              :   //   case AST::Literal::ERROR:
     191              :   //     rust_unreachable ();
     192              :   //   }
     193              : 
     194            3 :   bool append_newline = nl == AST::FormatArgs::Newline::Yes;
     195              : 
     196            3 :   auto fmt_str = std::move (format_str.value ());
     197            3 :   if (append_newline)
     198            0 :     fmt_str += '\n';
     199              : 
     200            3 :   auto pieces = Fmt::Pieces::collect (fmt_str, append_newline,
     201            3 :                                       Fmt::ffi::ParseMode::Format);
     202              : 
     203              :   // TODO:
     204              :   // do the transformation into an AST::FormatArgs node
     205              :   // return that
     206              :   // expand it during lowering
     207              : 
     208              :   // TODO: we now need to take care of creating `unfinished_literal`? this is
     209              :   // for creating the `template`
     210              : 
     211            3 :   auto fmt_args_node = AST::FormatArgs (invoc_locus, std::move (pieces),
     212            3 :                                         std::move (args.value ()));
     213              : 
     214            3 :   auto expanded
     215              :     = Fmt::expand_format_args (fmt_args_node,
     216            3 :                                invoc.get_delim_tok_tree ().to_token_stream ());
     217              : 
     218            3 :   if (!expanded.has_value ())
     219            0 :     return AST::Fragment::create_error ();
     220              : 
     221            3 :   return *expanded;
     222              : 
     223              :   // auto node = std::unique_ptr<AST::Expr> (fmt_args_node);
     224              :   // auto single_node = AST::SingleASTNode (std::move (node));
     225              : 
     226              :   // return AST::Fragment ({std::move (single_node)},
     227              :   //    invoc.get_delim_tok_tree ().to_token_stream ());
     228           14 : }
     229              : 
     230              : } // namespace Rust
        

Generated by: LCOV version 2.4-beta

LCOV profile is generated on x86_64 machine using following configure options: configure --disable-bootstrap --enable-coverage=opt --enable-languages=c,c++,fortran,go,jit,lto,rust,m2 --enable-host-shared. GCC test suite is run with the built compiler.