ld/ldexp.h

   1 /* ldexp.h -
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005 Free Software Foundation, Inc.
   4
   5    This file is part of GLD, the Gnu Linker.
   6
   7    GLD 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 2, or (at your option)
  10    any later version.
  11
  12    GLD 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 GLD; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    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 typedef struct {
  34   int node_code;
  35   unsigned int lineno;
  36   enum {
  37     etree_binary,
  38     etree_trinary,
  39     etree_unary,
  40     etree_name,
  41     etree_assign,
  42     etree_provide,
  43     etree_provided,
  44     etree_value,
  45     etree_assert,
  46     etree_rel
  47   } node_class;
  48 } node_type;
  49
  50 typedef union etree_union {
  51   node_type type;
  52   struct {
  53     node_type type;
  54     union etree_union *lhs;
  55     union etree_union *rhs;
  56   } binary;
  57   struct {
  58     node_type type;
  59     union etree_union *cond;
  60     union etree_union *lhs;
  61     union etree_union *rhs;
  62   } trinary;
  63   struct {
  64     node_type type;
  65     const char *dst;
  66     union etree_union *src;
  67     bfd_boolean hidden;
  68   } assign;
  69   struct {
  70     node_type type;
  71     union etree_union *child;
  72   } unary;
  73   struct {
  74     node_type type;
  75     const char *name;
  76   } name;
  77   struct {
  78     node_type type;
  79     bfd_vma value;
  80     char *str;
  81   } value;
  82   struct {
  83     node_type type;
  84     asection *section;
  85     bfd_vma value;
  86   } rel;
  87   struct {
  88     node_type type;
  89     union etree_union *child;
  90     const char *message;
  91   } assert_s;
  92 } etree_type;
  93
  94 typedef enum {
  95   lang_first_phase_enum,
  96   lang_mark_phase_enum,
  97   lang_allocating_phase_enum,
  98   lang_final_phase_enum
  99 } lang_phase_type;
 100
 101 struct ldexp_control {
 102   /* Modify expression evaluation depending on this.  */
 103   lang_phase_type phase;
 104
 105   /* Principally used for diagnostics.  */
 106   bfd_boolean assigning_to_dot;
 107
 108   /* Working results.  */
 109   etree_value_type result;
 110   bfd_vma dot;
 111
 112   /* Current dot and section passed to ldexp folder.  */
 113   bfd_vma *dotp;
 114   asection *section;
 115
 116   /* State machine and results for DATASEG.  */
 117   struct {
 118     enum {
 119       exp_dataseg_none,
 120       exp_dataseg_align_seen,
 121       exp_dataseg_relro_seen,
 122       exp_dataseg_end_seen,
 123       exp_dataseg_relro_adjust,
 124       exp_dataseg_adjust
 125     } phase;
 126
 127     bfd_vma base, min_base, relro_end, end, pagesize, maxpagesize;
 128   } dataseg;
 129 };
 130
 131 extern struct ldexp_control expld;
 132
 133 /* A maps from a segment name to a base address.  */
 134 typedef struct segment_struct {
 135   /* The next segment in the linked list.  */
 136   struct segment_struct *next;
 137   /* The name of the sgement.  */
 138   const char *name;
 139   /* The base address for the segment.  */
 140   bfd_vma value;
 141   /* True if a SEGMENT_START directive corresponding to this segment
 142      has been seen.  */
 143   bfd_boolean used;
 144 } segment_type;
 145
 146 /* The segments specified by the user on the command-line.  */
 147 extern segment_type *segments;
 148
 149 typedef struct _fill_type fill_type;
 150
 151 etree_type *exp_intop
 152   (bfd_vma);
 153 etree_type *exp_bigintop
 154   (bfd_vma, char *);
 155 etree_type *exp_relop
 156   (asection *, bfd_vma);
 157 void exp_fold_tree
 158   (etree_type *, asection *, bfd_vma *);
 159 etree_type *exp_binop
 160   (int, etree_type *, etree_type *);
 161 etree_type *exp_trinop
 162   (int,etree_type *, etree_type *, etree_type *);
 163 etree_type *exp_unop
 164   (int, etree_type *);
 165 etree_type *exp_nameop
 166   (int, const char *);
 167 etree_type *exp_assop
 168   (int, const char *, etree_type *);
 169 etree_type *exp_provide
 170   (const char *, etree_type *, bfd_boolean);
 171 etree_type *exp_assert
 172   (etree_type *, const char *);
 173 void exp_print_tree
 174   (etree_type *);
 175 bfd_vma exp_get_vma
 176   (etree_type *, bfd_vma, char *);
 177 int exp_get_value_int
 178   (etree_type *, int, char *);
 179 fill_type *exp_get_fill
 180   (etree_type *, fill_type *, char *);
 181 bfd_vma exp_get_abs_int
 182   (etree_type *, int, char *);
 183
 184 #endif