ld/ldexp.h

   1 /* ldexp.h -
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2007, 2011 Free Software Foundation, Inc.
   4
   5    This file is part of the GNU Binutils.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #ifndef LDEXP_H
  23 #define LDEXP_H
  24
  25 /* The result of an expression tree */
  26 typedef struct {
  27   bfd_vma value;
  28   char *str;
  29   asection *section;
  30   bfd_boolean valid_p;
  31 } etree_value_type;
  32
  33 enum node_tree_enum {
  34   etree_binary,
  35   etree_trinary,
  36   etree_unary,
  37   etree_name,
  38   etree_assign,
  39   etree_provide,
  40   etree_provided,
  41   etree_value,
  42   etree_assert,
  43   etree_rel
  44 };
  45
  46 typedef struct {
  47   int node_code;
  48   unsigned int lineno;
  49   enum node_tree_enum node_class;
  50 } node_type;
  51
  52 typedef union etree_union {
  53   node_type type;
  54   struct {
  55     node_type type;
  56     union etree_union *lhs;
  57     union etree_union *rhs;
  58   } binary;
  59   struct {
  60     node_type type;
  61     union etree_union *cond;
  62     union etree_union *lhs;
  63     union etree_union *rhs;
  64   } trinary;
  65   struct {
  66     node_type type;
  67     const char *dst;
  68     union etree_union *src;
  69     bfd_boolean hidden;
  70   } assign;
  71   struct {
  72     node_type type;
  73     union etree_union *child;
  74   } unary;
  75   struct {
  76     node_type type;
  77     const char *name;
  78   } name;
  79   struct {
  80     node_type type;
  81     bfd_vma value;
  82     char *str;
  83   } value;
  84   struct {
  85     node_type type;
  86     asection *section;
  87     bfd_vma value;
  88   } rel;
  89   struct {
  90     node_type type;
  91     union etree_union *child;
  92     const char *message;
  93   } assert_s;
  94 } etree_type;
  95
  96 typedef enum {
  97   lang_first_phase_enum,
  98   lang_mark_phase_enum,
  99   lang_allocating_phase_enum,
 100   lang_assigning_phase_enum,
 101   lang_final_phase_enum
 102 } lang_phase_type;
 103
 104 union lang_statement_union;
 105
 106 enum phase_enum {
 107   /* We step through the first four states here as we see the
 108      associated linker script tokens.  */
 109   exp_dataseg_none,
 110   exp_dataseg_align_seen,
 111   exp_dataseg_relro_seen,
 112   exp_dataseg_end_seen,
 113   /* The last three states are final, and affect the value returned
 114      by DATA_SEGMENT_ALIGN.  */
 115   exp_dataseg_relro_adjust,
 116   exp_dataseg_adjust,
 117   exp_dataseg_done
 118 };
 119
 120 enum relro_enum {
 121   exp_dataseg_relro_none,
 122   exp_dataseg_relro_start,
 123   exp_dataseg_relro_end,
 124 };
 125
 126 struct ldexp_control {
 127   /* Modify expression evaluation depending on this.  */
 128   lang_phase_type phase;
 129
 130   /* Principally used for diagnostics.  */
 131   bfd_boolean assigning_to_dot;
 132
 133   /* Working results.  */
 134   etree_value_type result;
 135   bfd_vma dot;
 136
 137   /* Current dot and section passed to ldexp folder.  */
 138   bfd_vma *dotp;
 139   asection *section;
 140
 141   /* State machine and results for DATASEG.  */
 142   struct {
 143     enum phase_enum phase;
 144
 145     bfd_vma base, min_base, relro_end, end, pagesize, maxpagesize;
 146
 147     enum relro_enum relro;
 148
 149     union lang_statement_union *relro_start_stat;
 150     union lang_statement_union *relro_end_stat;
 151   } dataseg;
 152 };
 153
 154 extern struct ldexp_control expld;
 155
 156 /* A maps from a segment name to a base address.  */
 157 typedef struct segment_struct {
 158   /* The next segment in the linked list.  */
 159   struct segment_struct *next;
 160   /* The name of the sgement.  */
 161   const char *name;
 162   /* The base address for the segment.  */
 163   bfd_vma value;
 164   /* True if a SEGMENT_START directive corresponding to this segment
 165      has been seen.  */
 166   bfd_boolean used;
 167 } segment_type;
 168
 169 /* The segments specified by the user on the command-line.  */
 170 extern segment_type *segments;
 171
 172 typedef struct _fill_type fill_type;
 173
 174 etree_type *exp_intop
 175   (bfd_vma);
 176 etree_type *exp_bigintop
 177   (bfd_vma, char *);
 178 etree_type *exp_relop
 179   (asection *, bfd_vma);
 180 void exp_fold_tree
 181   (etree_type *, asection *, bfd_vma *);
 182 void exp_fold_tree_no_dot
 183   (etree_type *);
 184 etree_type *exp_binop
 185   (int, etree_type *, etree_type *);
 186 etree_type *exp_trinop
 187   (int,etree_type *, etree_type *, etree_type *);
 188 etree_type *exp_unop
 189   (int, etree_type *);
 190 etree_type *exp_nameop
 191   (int, const char *);
 192 etree_type *exp_assign
 193   (const char *, etree_type *);
 194 etree_type *exp_defsym
 195   (const char *, etree_type *);
 196 etree_type *exp_provide
 197   (const char *, etree_type *, bfd_boolean);
 198 etree_type *exp_assert
 199   (etree_type *, const char *);
 200 void exp_print_tree
 201   (etree_type *);
 202 bfd_vma exp_get_vma
 203   (etree_type *, bfd_vma, char *);
 204 int exp_get_value_int
 205   (etree_type *, int, char *);
 206 fill_type *exp_get_fill
 207   (etree_type *, fill_type *, char *);
 208 bfd_vma exp_get_abs_int
 209   (etree_type *, int, char *);
 210
 211 #endif