ld/ldexp.h

   1 /* ldexp.h -
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2007 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_final_phase_enum
 101 } lang_phase_type;
 102
 103 union lang_statement_union;
 104
 105 enum phase_enum {
 106   exp_dataseg_none,
 107   exp_dataseg_align_seen,
 108   exp_dataseg_relro_seen,
 109   exp_dataseg_end_seen,
 110   exp_dataseg_relro_adjust,
 111   exp_dataseg_adjust
 112 };
 113
 114 enum relro_enum {
 115   exp_dataseg_relro_none,
 116   exp_dataseg_relro_start,
 117   exp_dataseg_relro_end,
 118 };
 119
 120 struct ldexp_control {
 121   /* Modify expression evaluation depending on this.  */
 122   lang_phase_type phase;
 123
 124   /* Principally used for diagnostics.  */
 125   bfd_boolean assigning_to_dot;
 126
 127   /* Working results.  */
 128   etree_value_type result;
 129   bfd_vma dot;
 130   /* Set if an expression contains DEFINED().  */
 131   bfd_boolean uses_defined;
 132
 133   /* Current dot and section passed to ldexp folder.  */
 134   bfd_vma *dotp;
 135   asection *section;
 136
 137   /* State machine and results for DATASEG.  */
 138   struct {
 139     enum phase_enum phase;
 140
 141     bfd_vma base, min_base, relro_end, end, pagesize, maxpagesize;
 142
 143     enum relro_enum relro;
 144
 145     union lang_statement_union *relro_start_stat;
 146     union lang_statement_union *relro_end_stat;
 147   } dataseg;
 148 };
 149
 150 extern struct ldexp_control expld;
 151
 152 /* A maps from a segment name to a base address.  */
 153 typedef struct segment_struct {
 154   /* The next segment in the linked list.  */
 155   struct segment_struct *next;
 156   /* The name of the sgement.  */
 157   const char *name;
 158   /* The base address for the segment.  */
 159   bfd_vma value;
 160   /* True if a SEGMENT_START directive corresponding to this segment
 161      has been seen.  */
 162   bfd_boolean used;
 163 } segment_type;
 164
 165 /* The segments specified by the user on the command-line.  */
 166 extern segment_type *segments;
 167
 168 typedef struct _fill_type fill_type;
 169
 170 etree_type *exp_intop
 171   (bfd_vma);
 172 etree_type *exp_bigintop
 173   (bfd_vma, char *);
 174 etree_type *exp_relop
 175   (asection *, bfd_vma);
 176 void exp_fold_tree
 177   (etree_type *, asection *, bfd_vma *);
 178 void exp_fold_tree_no_dot
 179   (etree_type *);
 180 etree_type *exp_binop
 181   (int, etree_type *, etree_type *);
 182 etree_type *exp_trinop
 183   (int,etree_type *, etree_type *, etree_type *);
 184 etree_type *exp_unop
 185   (int, etree_type *);
 186 etree_type *exp_nameop
 187   (int, const char *);
 188 etree_type *exp_assop
 189   (int, const char *, etree_type *);
 190 etree_type *exp_provide
 191   (const char *, etree_type *, bfd_boolean);
 192 etree_type *exp_assert
 193   (etree_type *, const char *);
 194 void exp_print_tree
 195   (etree_type *);
 196 bfd_vma exp_get_vma
 197   (etree_type *, bfd_vma, char *);
 198 int exp_get_value_int
 199   (etree_type *, int, char *);
 200 fill_type *exp_get_fill
 201   (etree_type *, fill_type *, char *);
 202 bfd_vma exp_get_abs_int
 203   (etree_type *, int, char *);
 204
 205 #endif