LCOV - code coverage report
Current view: top level - gcc/c - c-convert.c (source / functions) Hit Total Coverage
Test: gcc.info Lines: 63 74 85.1 %
Date: 2020-03-28 11:57:23 Functions: 1 1 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* Language-level data type conversion for GNU C.
       2                 :            :    Copyright (C) 1987-2020 Free Software Foundation, Inc.
       3                 :            : 
       4                 :            : This file is part of GCC.
       5                 :            : 
       6                 :            : GCC is free software; you can redistribute it and/or modify it under
       7                 :            : the terms of the GNU General Public License as published by the Free
       8                 :            : Software Foundation; either version 3, or (at your option) any later
       9                 :            : version.
      10                 :            : 
      11                 :            : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      12                 :            : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13                 :            : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      14                 :            : for more details.
      15                 :            : 
      16                 :            : You should have received a copy of the GNU General Public License
      17                 :            : along with GCC; see the file COPYING3.  If not see
      18                 :            : <http://www.gnu.org/licenses/>.  */
      19                 :            : 
      20                 :            : 
      21                 :            : /* This file contains the functions for converting C expressions
      22                 :            :    to different data types.  The only entry point is `convert'.
      23                 :            :    Every language front end must have a `convert' function
      24                 :            :    but what kind of conversions it does will depend on the language.  */
      25                 :            : 
      26                 :            : #include "config.h"
      27                 :            : #include "system.h"
      28                 :            : #include "coretypes.h"
      29                 :            : #include "target.h"
      30                 :            : #include "c-tree.h"
      31                 :            : #include "convert.h"
      32                 :            : #include "langhooks.h"
      33                 :            : #include "ubsan.h"
      34                 :            : #include "stringpool.h"
      35                 :            : #include "attribs.h"
      36                 :            : #include "asan.h"
      37                 :            : 
      38                 :            : /* Change of width--truncation and extension of integers or reals--
      39                 :            :    is represented with NOP_EXPR.  Proper functioning of many things
      40                 :            :    assumes that no other conversions can be NOP_EXPRs.
      41                 :            : 
      42                 :            :    Conversion between integer and pointer is represented with CONVERT_EXPR.
      43                 :            :    Converting integer to real uses FLOAT_EXPR
      44                 :            :    and real to integer uses FIX_TRUNC_EXPR.
      45                 :            : 
      46                 :            :    Here is a list of all the functions that assume that widening and
      47                 :            :    narrowing is always done with a NOP_EXPR:
      48                 :            :      In convert.c, convert_to_integer.
      49                 :            :      In c-typeck.c, build_binary_op (boolean ops), and
      50                 :            :         c_common_truthvalue_conversion.
      51                 :            :      In expr.c: expand_expr, for operands of a MULT_EXPR.
      52                 :            :      In fold-const.c: fold.
      53                 :            :      In tree.c: get_narrower and get_unwidened.  */
      54                 :            : 
      55                 :            : /* Subroutines of `convert'.  */
      56                 :            : 
      57                 :            : 
      58                 :            : 
      59                 :            : /* Create an expression whose value is that of EXPR,
      60                 :            :    converted to type TYPE.  The TREE_TYPE of the value
      61                 :            :    is always TYPE.  This function implements all reasonable
      62                 :            :    conversions; callers should filter out those that are
      63                 :            :    not permitted by the language being compiled.  */
      64                 :            : 
      65                 :            : tree
      66                 :  135099000 : convert (tree type, tree expr)
      67                 :            : {
      68                 :  135099000 :   tree e = expr;
      69                 :  135099000 :   enum tree_code code = TREE_CODE (type);
      70                 :  135099000 :   const char *invalid_conv_diag;
      71                 :  135099000 :   tree ret;
      72                 :  135099000 :   location_t loc = EXPR_LOCATION (expr);
      73                 :            : 
      74                 :  135099000 :   if (type == error_mark_node
      75                 :  270199000 :       || error_operand_p (expr))
      76                 :            :     return error_mark_node;
      77                 :            : 
      78                 :  270199000 :   if ((invalid_conv_diag
      79                 :  135099000 :        = targetm.invalid_conversion (TREE_TYPE (expr), type)))
      80                 :            :     {
      81                 :          0 :       error (invalid_conv_diag);
      82                 :          0 :       return error_mark_node;
      83                 :            :     }
      84                 :            : 
      85                 :  135099000 :   if (type == TREE_TYPE (expr))
      86                 :            :     return expr;
      87                 :  115387000 :   ret = targetm.convert_to_type (type, expr);
      88                 :  115387000 :   if (ret)
      89                 :            :       return ret;
      90                 :            : 
      91                 :  125240000 :   STRIP_TYPE_NOPS (e);
      92                 :            : 
      93                 :  115387000 :   if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr))
      94                 :  115387000 :       && (TREE_CODE (TREE_TYPE (expr)) != COMPLEX_TYPE
      95                 :      18332 :           || TREE_CODE (e) == COMPLEX_EXPR))
      96                 :   26827300 :     return fold_convert_loc (loc, type, expr);
      97                 :   88560100 :   if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
      98                 :          0 :     return error_mark_node;
      99                 :   88560100 :   if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE)
     100                 :            :     {
     101                 :          0 :       error ("void value not ignored as it ought to be");
     102                 :          0 :       return error_mark_node;
     103                 :            :     }
     104                 :            : 
     105                 :   88560100 :   switch (code)
     106                 :            :     {
     107                 :      35271 :     case VOID_TYPE:
     108                 :      35271 :       return fold_convert_loc (loc, type, e);
     109                 :            : 
     110                 :   28859100 :     case INTEGER_TYPE:
     111                 :   28859100 :     case ENUMERAL_TYPE:
     112                 :   28859100 :       if (sanitize_flags_p (SANITIZE_FLOAT_CAST)
     113                 :      87159 :           && current_function_decl != NULL_TREE
     114                 :      87159 :           && TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE
     115                 :   28870800 :           && COMPLETE_TYPE_P (type))
     116                 :            :         {
     117                 :      11692 :           expr = save_expr (expr);
     118                 :      11692 :           expr = c_fully_fold (expr, false, NULL);
     119                 :      11692 :           tree check = ubsan_instrument_float_cast (loc, type, expr);
     120                 :      11692 :           expr = fold_build1 (FIX_TRUNC_EXPR, type, expr);
     121                 :      11692 :           if (check == NULL_TREE)
     122                 :            :             return expr;
     123                 :       7096 :           return fold_build2 (COMPOUND_EXPR, TREE_TYPE (expr), check, expr);
     124                 :            :         }
     125                 :   28847400 :       ret = convert_to_integer (type, e);
     126                 :   28847400 :       goto maybe_fold;
     127                 :            : 
     128                 :      34762 :     case BOOLEAN_TYPE:
     129                 :      34762 :       return fold_convert_loc
     130                 :      34762 :         (loc, type, c_objc_common_truthvalue_conversion (input_location, expr));
     131                 :            : 
     132                 :    3941760 :     case POINTER_TYPE:
     133                 :    3941760 :     case REFERENCE_TYPE:
     134                 :    3941760 :       ret = convert_to_pointer (type, e);
     135                 :    3941760 :       goto maybe_fold;
     136                 :            : 
     137                 :     639173 :     case REAL_TYPE:
     138                 :     639173 :       ret = convert_to_real (type, e);
     139                 :     639173 :       goto maybe_fold;
     140                 :            : 
     141                 :          0 :     case FIXED_POINT_TYPE:
     142                 :          0 :       ret = convert_to_fixed (type, e);
     143                 :          0 :       goto maybe_fold;
     144                 :            : 
     145                 :     113150 :     case COMPLEX_TYPE:
     146                 :     113150 :       ret = convert_to_complex (type, e);
     147                 :     113150 :       goto maybe_fold;
     148                 :            : 
     149                 :   54936600 :     case VECTOR_TYPE:
     150                 :   54936600 :       if (gnu_vector_type_p (type)
     151                 :          0 :           || gnu_vector_type_p (TREE_TYPE (e))
     152                 :            :           /* Allow conversions between compatible non-GNU vector types
     153                 :            :              when -flax-vector-conversions is passed.  The whole purpose
     154                 :            :              of the option is to bend the normal type rules and accept
     155                 :            :              nonconforming code.  */
     156                 :   54936600 :           || (flag_lax_vector_conversions
     157                 :          0 :               && VECTOR_TYPE_P (TREE_TYPE (e))
     158                 :          0 :               && vector_types_convertible_p (type, TREE_TYPE (e), false)))
     159                 :            :         {
     160                 :   54936600 :           ret = convert_to_vector (type, e);
     161                 :   54936600 :           goto maybe_fold;
     162                 :            :         }
     163                 :            :       break;
     164                 :            : 
     165                 :        204 :     case RECORD_TYPE:
     166                 :        204 :     case UNION_TYPE:
     167                 :        204 :       if (lang_hooks.types_compatible_p (type, TREE_TYPE (expr)))
     168                 :            :         return e;
     169                 :            :       break;
     170                 :            : 
     171                 :            :     default:
     172                 :            :       break;
     173                 :            : 
     174                 :   88478100 :     maybe_fold:
     175                 :   88478100 :       if (TREE_CODE (ret) != C_MAYBE_CONST_EXPR)
     176                 :   88478100 :         ret = fold (ret);
     177                 :            :       return ret;
     178                 :            :     }
     179                 :            : 
     180                 :        204 :   error ("conversion to non-scalar type requested");
     181                 :        204 :   return error_mark_node;
     182                 :            : }

Generated by: LCOV version 1.0

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 --enable-host-shared. GCC test suite is run with the built compiler.