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
183