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   enum {
  36     etree_binary,
  37     etree_trinary,
  38     etree_unary,
  39     etree_name,
  40     etree_assign,
  41     etree_provide,
  42     etree_provided,
  43     etree_value,
  44     etree_assert,
  45     etree_rel
  46   } node_class;
  47 } node_type;
  48
  49 typedef union etree_union {
  50   node_type type;
  51   struct {
  52     node_type type;
  53     union etree_union *lhs;
  54     union etree_union *rhs;
  55   } binary;
  56   struct {
  57     node_type type;
  58     union etree_union *cond;
  59     union etree_union *lhs;
  60     union etree_union *rhs;
  61   } trinary;
  62   struct {
  63     node_type type;
  64     const char *dst;
  65     union etree_union *src;
  66   } assign;
  67   struct {
  68     node_type type;
  69     union etree_union *child;
  70   } unary;
  71   struct {
  72     node_type type;
  73     const char *name;
  74   } name;
  75   struct {
  76     node_type type;
  77     bfd_vma value;
  78     char *str;
  79   } value;
  80   struct {
  81     node_type type;
  82     asection *section;
  83     bfd_vma value;
  84   } rel;
  85   struct {
  86     node_type type;
  87     union etree_union *child;
  88     const char *message;
  89   } assert_s;
  90 } etree_type;
  91
  92 typedef enum {
  93   lang_first_phase_enum,
  94   lang_mark_phase_enum,
  95   lang_allocating_phase_enum,
  96   lang_final_phase_enum
  97 } lang_phase_type;
  98
  99 struct ldexp_control {
 100   /* Modify expression evaluation depending on this.  */
 101   lang_phase_type phase;
 102
 103   /* Principally used for diagnostics.  */
 104   bfd_boolean assigning_to_dot;
 105
 106   /* Working results.  */
 107   etree_value_type result;
 108   bfd_vma dot;
 109
 110   /* Current dot and section passed to ldexp folder.  */
 111   bfd_vma *dotp;
 112   asection *section;
 113
 114   /* State machine and results for DATASEG.  */
 115   struct {
 116     enum {
 117       exp_dataseg_none,
 118       exp_dataseg_align_seen,
 119       exp_dataseg_relro_seen,
 120       exp_dataseg_end_seen,
 121       exp_dataseg_relro_adjust,
 122       exp_dataseg_adjust
 123     } phase;
 124
 125     bfd_vma base, min_base, relro_end, end, pagesize, maxpagesize;
 126   } dataseg;
 127 };
 128
 129 extern struct ldexp_control expld;
 130
 131 /* A maps from a segment name to a base address.  */
 132 typedef struct segment_struct {
 133   /* The next segment in the linked list.  */
 134   struct segment_struct *next;
 135   /* The name of the sgement.  */
 136   const char *name;
 137   /* The base address for the segment.  */
 138   bfd_vma value;
 139   /* True if a SEGMENT_START directive corresponding to this segment
 140      has been seen.  */
 141   bfd_boolean used;
 142 } segment_type;
 143
 144 /* The segments specified by the user on the command-line.  */
 145 extern segment_type *segments;
 146
 147 typedef struct _fill_type fill_type;
 148
 149 etree_type *exp_intop
 150   (bfd_vma);
 151 etree_type *exp_bigintop
 152   (bfd_vma, char *);
 153 etree_type *exp_relop
 154   (asection *, bfd_vma);
 155 void exp_fold_tree
 156   (etree_type *, asection *, bfd_vma *);
 157 etree_type *exp_binop
 158   (int, etree_type *, etree_type *);
 159 etree_type *exp_trinop
 160   (int,etree_type *, etree_type *, etree_type *);
 161 etree_type *exp_unop
 162   (int, etree_type *);
 163 etree_type *exp_nameop
 164   (int, const char *);
 165 etree_type *exp_assop
 166   (int, const char *, etree_type *);
 167 etree_type *exp_provide
 168   (const char *, etree_type *);
 169 etree_type *exp_assert
 170   (etree_type *, const char *);
 171 void exp_print_tree
 172   (etree_type *);
 173 bfd_vma exp_get_vma
 174   (etree_type *, bfd_vma, char *);
 175 int exp_get_value_int
 176   (etree_type *, int, char *);
 177 fill_type *exp_get_fill
 178   (etree_type *, fill_type *, char *);
 179 bfd_vma exp_get_abs_int
 180   (etree_type *, int, char *);
 181
 182 #endif