LCOV - code coverage report
Current view: top level - gcc/rust/expand - rust-macro-builtins-include.cc (source / functions) Coverage Total Hit
Test: gcc.info Lines: 90.9 % 121 110
Test Date: 2025-06-21 16:26:05 Functions: 100.0 % 3 3
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: - 0 0

             Branch data     Line data    Source code
       1                 :             : // Copyright (C) 2020-2025 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                 :             : 
      19                 :             : #include "rust-ast-fragment.h"
      20                 :             : #include "rust-common.h"
      21                 :             : #include "rust-macro-builtins.h"
      22                 :             : #include "rust-macro-builtins-helpers.h"
      23                 :             : #include "rust-session-manager.h"
      24                 :             : #include "optional.h"
      25                 :             : namespace Rust {
      26                 :             : /* Expand builtin macro include_bytes!("filename"), which includes the contents
      27                 :             : of the given file as reference to a byte array. Yields an expression of type
      28                 :             : &'static [u8; N].  */
      29                 :             : 
      30                 :             : tl::optional<AST::Fragment>
      31                 :          55 : MacroBuiltin::include_bytes_handler (location_t invoc_locus,
      32                 :             :                                      AST::MacroInvocData &invoc,
      33                 :             :                                      AST::InvocKind semicolon)
      34                 :             : {
      35                 :             :   /* Get target filename from the macro invocation, which is treated as a path
      36                 :             :      relative to the include!-ing file (currently being compiled).  */
      37                 :          55 :   auto lit_expr
      38                 :             :     = parse_single_string_literal (BuiltinMacro::IncludeBytes,
      39                 :             :                                    invoc.get_delim_tok_tree (), invoc_locus,
      40                 :          55 :                                    invoc.get_expander ());
      41                 :          55 :   if (lit_expr == nullptr)
      42                 :          12 :     return AST::Fragment::create_error ();
      43                 :             : 
      44                 :          49 :   if (!lit_expr->is_literal ())
      45                 :             :     {
      46                 :          20 :       auto token_tree = invoc.get_delim_tok_tree ();
      47                 :          40 :       return AST::Fragment ({AST::SingleASTNode (std::move (lit_expr))},
      48                 :          80 :                             token_tree.to_token_stream ());
      49                 :          20 :     }
      50                 :             : 
      51                 :          29 :   std::string target_filename
      52                 :          29 :     = source_relative_path (lit_expr->as_string (), invoc_locus);
      53                 :             : 
      54                 :          29 :   auto maybe_bytes = load_file_bytes (invoc_locus, target_filename.c_str ());
      55                 :             : 
      56                 :          29 :   if (!maybe_bytes.has_value ())
      57                 :           8 :     return AST::Fragment::create_error ();
      58                 :             : 
      59                 :          25 :   std::vector<uint8_t> bytes = maybe_bytes.value ();
      60                 :             : 
      61                 :             :   /* Is there a more efficient way to do this?  */
      62                 :          25 :   std::vector<std::unique_ptr<AST::Expr>> elts;
      63                 :             : 
      64                 :             :   // We create the tokens for a borrow expression of a byte array, so
      65                 :             :   // & [ <byte0>, <byte1>, ... ]
      66                 :          25 :   std::vector<std::unique_ptr<AST::Token>> toks;
      67                 :          25 :   toks.emplace_back (make_token (Token::make (AMP, invoc_locus)));
      68                 :          25 :   toks.emplace_back (make_token (Token::make (LEFT_SQUARE, invoc_locus)));
      69                 :             : 
      70                 :        3017 :   for (uint8_t b : bytes)
      71                 :             :     {
      72                 :        2992 :       elts.emplace_back (
      73                 :        5984 :         new AST::LiteralExpr (std::string (1, (char) b), AST::Literal::BYTE,
      74                 :             :                               PrimitiveCoreType::CORETYPE_U8,
      75                 :        5984 :                               {} /* outer_attrs */, invoc_locus));
      76                 :        2992 :       toks.emplace_back (make_token (Token::make_byte_char (invoc_locus, b)));
      77                 :        5984 :       toks.emplace_back (make_token (Token::make (COMMA, invoc_locus)));
      78                 :             :     }
      79                 :             : 
      80                 :          25 :   toks.emplace_back (make_token (Token::make (RIGHT_SQUARE, invoc_locus)));
      81                 :             : 
      82                 :          25 :   auto elems = std::unique_ptr<AST::ArrayElems> (
      83                 :          25 :     new AST::ArrayElemsValues (std::move (elts), invoc_locus));
      84                 :             : 
      85                 :          25 :   auto array = std::unique_ptr<AST::Expr> (
      86                 :          25 :     new AST::ArrayExpr (std::move (elems), {}, {}, invoc_locus));
      87                 :             : 
      88                 :          25 :   auto borrow = std::unique_ptr<AST::Expr> (
      89                 :             :     new AST::BorrowExpr (std::move (array), Mutability::Imm,
      90                 :             :                          /* raw borrow */ false,
      91                 :          25 :                          /* double borrow */ false, {}, invoc_locus));
      92                 :             : 
      93                 :          25 :   auto node = AST::SingleASTNode (std::move (borrow));
      94                 :             : 
      95                 :          75 :   return AST::Fragment ({node}, std::move (toks));
      96                 :          80 : }
      97                 :             : 
      98                 :             : /* Expand builtin macro include_str!("filename"), which includes the contents
      99                 :             :    of the given file as a string. The file must be UTF-8 encoded. Yields an
     100                 :             :    expression of type &'static str.  */
     101                 :             : 
     102                 :             : tl::optional<AST::Fragment>
     103                 :          61 : MacroBuiltin::include_str_handler (location_t invoc_locus,
     104                 :             :                                    AST::MacroInvocData &invoc,
     105                 :             :                                    AST::InvocKind semicolon)
     106                 :             : {
     107                 :             :   /* Get target filename from the macro invocation, which is treated as a path
     108                 :             :      relative to the include!-ing file (currently being compiled).  */
     109                 :          61 :   auto lit_expr
     110                 :             :     = parse_single_string_literal (BuiltinMacro::IncludeStr,
     111                 :             :                                    invoc.get_delim_tok_tree (), invoc_locus,
     112                 :          61 :                                    invoc.get_expander ());
     113                 :          61 :   if (lit_expr == nullptr)
     114                 :          12 :     return AST::Fragment::create_error ();
     115                 :             : 
     116                 :          55 :   if (!lit_expr->is_literal ())
     117                 :             :     {
     118                 :          22 :       auto token_tree = invoc.get_delim_tok_tree ();
     119                 :          44 :       return AST::Fragment ({AST::SingleASTNode (std::move (lit_expr))},
     120                 :          88 :                             token_tree.to_token_stream ());
     121                 :          22 :     }
     122                 :             : 
     123                 :          33 :   std::string target_filename
     124                 :          33 :     = source_relative_path (lit_expr->as_string (), invoc_locus);
     125                 :             : 
     126                 :          33 :   auto maybe_bytes = load_file_bytes (invoc_locus, target_filename.c_str ());
     127                 :             : 
     128                 :          33 :   if (!maybe_bytes.has_value ())
     129                 :           8 :     return AST::Fragment::create_error ();
     130                 :             : 
     131                 :          29 :   std::vector<uint8_t> bytes = maybe_bytes.value ();
     132                 :             : 
     133                 :             :   /* FIXME: reuse lexer */
     134                 :          29 :   int expect_single = 0;
     135                 :        3261 :   for (uint8_t b : bytes)
     136                 :             :     {
     137                 :        3234 :       if (expect_single)
     138                 :             :         {
     139                 :           0 :           if ((b & 0xC0) != 0x80)
     140                 :             :             /* character was truncated, exit with expect_single != 0 */
     141                 :             :             break;
     142                 :           0 :           expect_single--;
     143                 :             :         }
     144                 :        3234 :       else if (b & 0x80)
     145                 :             :         {
     146                 :           2 :           if (b >= 0xF8)
     147                 :             :             {
     148                 :             :               /* more than 4 leading 1s */
     149                 :             :               expect_single = 1;
     150                 :             :               break;
     151                 :             :             }
     152                 :           0 :           else if (b >= 0xF0)
     153                 :             :             {
     154                 :             :               /* 4 leading 1s */
     155                 :             :               expect_single = 3;
     156                 :             :             }
     157                 :           0 :           else if (b >= 0xE0)
     158                 :             :             {
     159                 :             :               /* 3 leading 1s */
     160                 :             :               expect_single = 2;
     161                 :             :             }
     162                 :           0 :           else if (b >= 0xC0)
     163                 :             :             {
     164                 :             :               /* 2 leading 1s */
     165                 :             :               expect_single = 1;
     166                 :             :             }
     167                 :             :           else
     168                 :             :             {
     169                 :             :               /* only 1 leading 1 */
     170                 :             :               expect_single = 1;
     171                 :             :               break;
     172                 :             :             }
     173                 :             :         }
     174                 :             :     }
     175                 :             : 
     176                 :          29 :   std::string str;
     177                 :          29 :   if (expect_single)
     178                 :           2 :     rust_error_at (invoc_locus, "%s was not a valid utf-8 file",
     179                 :             :                    target_filename.c_str ());
     180                 :             :   else
     181                 :          27 :     str = std::string ((const char *) bytes.data (), bytes.size ());
     182                 :             : 
     183                 :          58 :   auto node = AST::SingleASTNode (make_string (invoc_locus, str));
     184                 :          29 :   auto str_tok = make_token (Token::make_string (invoc_locus, std::move (str)));
     185                 :             : 
     186                 :          87 :   return AST::Fragment ({node}, std::move (str_tok));
     187                 :          90 : }
     188                 :             : 
     189                 :             : /* Expand builtin macro include!(), which includes a source file at the current
     190                 :             : scope compile time. */
     191                 :             : 
     192                 :             : tl::optional<AST::Fragment>
     193                 :          14 : MacroBuiltin::include_handler (location_t invoc_locus,
     194                 :             :                                AST::MacroInvocData &invoc,
     195                 :             :                                AST::InvocKind semicolon)
     196                 :             : {
     197                 :          14 :   bool is_semicoloned = semicolon == AST::InvocKind::Semicoloned;
     198                 :             :   /* Get target filename from the macro invocation, which is treated as a path
     199                 :             :      relative to the include!-ing file (currently being compiled).  */
     200                 :          14 :   std::unique_ptr<AST::Expr> lit_expr
     201                 :             :     = parse_single_string_literal (BuiltinMacro::Include,
     202                 :             :                                    invoc.get_delim_tok_tree (), invoc_locus,
     203                 :          14 :                                    invoc.get_expander (), is_semicoloned);
     204                 :          14 :   if (lit_expr == nullptr)
     205                 :           0 :     return AST::Fragment::create_error ();
     206                 :             : 
     207                 :          14 :   if (!lit_expr->is_literal ())
     208                 :             :     {
     209                 :             :       // We have to expand an inner macro eagerly
     210                 :           4 :       auto token_tree = invoc.get_delim_tok_tree ();
     211                 :             : 
     212                 :             :       // parse_single_string_literal returned an AST::MacroInvocation, which
     213                 :             :       // can either be an AST::Item or AST::Expr. Depending on the context the
     214                 :             :       // original macro was invoked in, we will set AST::Item or AST::Expr
     215                 :             :       // appropriately.
     216                 :           4 :       if (is_semicoloned)
     217                 :             :         {
     218                 :           2 :           std::unique_ptr<AST::Item> lit_item = std::unique_ptr<AST::Item> (
     219                 :           2 :             static_cast<AST::MacroInvocation *> (lit_expr.release ()));
     220                 :           4 :           return AST::Fragment ({AST::SingleASTNode (std::move (lit_item))},
     221                 :           8 :                                 token_tree.to_token_stream ());
     222                 :           2 :         }
     223                 :             :       else
     224                 :           4 :         return AST::Fragment ({AST::SingleASTNode (std::move (lit_expr))},
     225                 :           8 :                               token_tree.to_token_stream ());
     226                 :           4 :     }
     227                 :             : 
     228                 :          10 :   std::string filename
     229                 :          10 :     = source_relative_path (lit_expr->as_string (), invoc_locus);
     230                 :          10 :   auto target_filename
     231                 :          10 :     = Rust::Session::get_instance ().include_extra_file (std::move (filename));
     232                 :             : 
     233                 :          10 :   RAIIFile target_file (target_filename);
     234                 :          10 :   Linemap *linemap = Session::get_instance ().linemap;
     235                 :             : 
     236                 :          10 :   if (!target_file.ok ())
     237                 :             :     {
     238                 :           0 :       rust_error_at (lit_expr->get_locus (),
     239                 :             :                      "cannot open included file %qs: %m", target_filename);
     240                 :           0 :       return AST::Fragment::create_error ();
     241                 :             :     }
     242                 :             : 
     243                 :          10 :   rust_debug ("Attempting to parse included file %s", target_filename);
     244                 :             : 
     245                 :          10 :   Lexer lex (target_filename, std::move (target_file), linemap);
     246                 :          10 :   Parser<Lexer> parser (lex);
     247                 :          10 :   std::unique_ptr<AST::Expr> parsed_expr = nullptr;
     248                 :          10 :   std::vector<std::unique_ptr<AST::Item>> parsed_items{};
     249                 :             : 
     250                 :          10 :   if (is_semicoloned)
     251                 :           6 :     parsed_items = parser.parse_items ();
     252                 :             :   else
     253                 :           4 :     parsed_expr = parser.parse_expr ();
     254                 :             : 
     255                 :          10 :   bool has_error = !parser.get_errors ().empty ();
     256                 :             : 
     257                 :          10 :   for (const auto &error : parser.get_errors ())
     258                 :           0 :     error.emit ();
     259                 :             : 
     260                 :          10 :   if (has_error)
     261                 :             :     {
     262                 :             :       // inform the user that the errors above are from a included file
     263                 :           0 :       rust_inform (invoc_locus, "included from here");
     264                 :           0 :       return AST::Fragment::create_error ();
     265                 :             :     }
     266                 :             : 
     267                 :          10 :   std::vector<AST::SingleASTNode> nodes{};
     268                 :          10 :   if (is_semicoloned)
     269                 :          10 :     for (auto &item : parsed_items)
     270                 :             :       {
     271                 :           4 :         AST::SingleASTNode node (std::move (item));
     272                 :           4 :         nodes.push_back (node);
     273                 :           4 :       }
     274                 :             :   else
     275                 :             :     {
     276                 :           4 :       AST::SingleASTNode node (std::move (parsed_expr));
     277                 :           4 :       nodes.push_back (node);
     278                 :           4 :     }
     279                 :             :   // FIXME: This returns an empty vector of tokens and works fine, but is that
     280                 :             :   // the expected behavior? `include` macros are a bit harder to reason about
     281                 :             :   // since they include tokens. Furthermore, our lexer has no easy way to return
     282                 :             :   // a slice of tokens like the MacroInvocLexer. So it gets even harder to
     283                 :             :   // extract tokens from here. For now, let's keep it that way and see if it
     284                 :             :   // eventually breaks, but I don't expect it to cause many issues since the
     285                 :             :   // list of tokens is only used when a macro invocation mixes eager
     286                 :             :   // macro invocations and already expanded tokens. Think
     287                 :             :   // `concat!(a!(), 15, b!())`. We need to be able to expand a!(), expand b!(),
     288                 :             :   // and then insert the `15` token in between. In the case of `include!()`, we
     289                 :             :   // only have one argument. So it's either going to be a macro invocation or a
     290                 :             :   // string literal.
     291                 :          20 :   return AST::Fragment (nodes, std::vector<std::unique_ptr<AST::Token>> ());
     292                 :          34 : }
     293                 :             : } // namespace Rust
        

Generated by: LCOV version 2.1-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.