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/* ldexp.h -
Copyright (C) 1991-2017 Free Software Foundation, Inc.
This file is part of the GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#ifndef LDEXP_H
#define LDEXP_H
/* The result of an expression tree */
typedef struct {
bfd_vma value;
char *str;
asection *section;
bfd_boolean valid_p;
} etree_value_type;
enum node_tree_enum {
etree_binary,
etree_trinary,
etree_unary,
etree_name,
etree_assign,
etree_provide,
etree_provided,
etree_value,
etree_assert,
etree_rel
};
typedef struct {
int node_code;
unsigned int lineno;
const char *filename;
enum node_tree_enum node_class;
} node_type;
typedef union etree_union {
node_type type;
struct {
node_type type;
union etree_union *lhs;
union etree_union *rhs;
} binary;
struct {
node_type type;
union etree_union *cond;
union etree_union *lhs;
union etree_union *rhs;
} trinary;
struct {
node_type type;
const char *dst;
union etree_union *src;
bfd_boolean defsym;
bfd_boolean hidden;
} assign;
struct {
node_type type;
union etree_union *child;
} unary;
struct {
node_type type;
const char *name;
} name;
struct {
node_type type;
bfd_vma value;
char *str;
} value;
struct {
node_type type;
asection *section;
bfd_vma value;
} rel;
struct {
node_type type;
union etree_union *child;
const char *message;
} assert_s;
} etree_type;
/* Expression evaluation control. */
typedef enum
{
/* Parsing linker script. Will only return "valid" for expressions
that evaluate to a constant. */
lang_first_phase_enum,
/* Prior to section sizing. */
lang_mark_phase_enum,
/* During section sizing. */
lang_allocating_phase_enum,
/* During assignment of symbol values when relaxation in progress. */
lang_assigning_phase_enum,
/* Final assignment of symbol values. */
lang_final_phase_enum
} lang_phase_type;
union lang_statement_union;
enum phase_enum {
/* We step through the first four states here as we see the
associated linker script tokens. */
exp_seg_none,
exp_seg_align_seen,
exp_seg_relro_seen,
exp_seg_end_seen,
/* The last three states are final, and affect the value returned
by XXX_SEGMENT_ALIGN. */
exp_seg_relro_adjust,
exp_seg_adjust,
exp_seg_done
};
enum relro_enum {
exp_seg_relro_none,
exp_seg_relro_start,
exp_seg_relro_end,
};
typedef struct {
enum phase_enum phase;
bfd_vma base, relro_offset, relro_end, end, pagesize, maxpagesize;
enum relro_enum relro;
union lang_statement_union *relro_start_stat;
union lang_statement_union *relro_end_stat;
} seg_align_type;
struct ldexp_control {
/* Modify expression evaluation depending on this. */
lang_phase_type phase;
/* Principally used for diagnostics. */
bfd_boolean assigning_to_dot;
/* Set if the current expression used "dot", SEGMENT_START or
ORIGIN, but not ABSOLUTE or combined symbols in a way that forces
an absolute result. Used in tracking symbols assigned from dot
outside of output section statements, in order to later convert
them from absolute. */
bfd_boolean rel_from_abs;
/* If evaluating an assignment, the destination. Cleared if an
etree_name NAME matches this, to signal a self-assignment.
Note that an etree_name DEFINED does not clear this field, nor
does the false branch of a trinary expression. */
const char *assign_name;
/* Working results. */
etree_value_type result;
bfd_vma dot;
/* Current dot and section passed to ldexp folder. */
bfd_vma *dotp;
asection *section;
/* State machine and results for DATASEG. */
seg_align_type dataseg;
};
extern struct ldexp_control expld;
/* A maps from a segment name to a base address. */
typedef struct segment_struct {
/* The next segment in the linked list. */
struct segment_struct *next;
/* The name of the sgement. */
const char *name;
/* The base address for the segment. */
bfd_vma value;
/* True if a SEGMENT_START directive corresponding to this segment
has been seen. */
bfd_boolean used;
} segment_type;
/* The segments specified by the user on the command-line. */
extern segment_type *segments;
typedef struct _fill_type fill_type;
etree_type *exp_intop
(bfd_vma);
etree_type *exp_bigintop
(bfd_vma, char *);
etree_type *exp_relop
(asection *, bfd_vma);
void exp_fold_tree
(etree_type *, asection *, bfd_vma *);
void exp_fold_tree_no_dot
(etree_type *);
etree_type *exp_binop
(int, etree_type *, etree_type *);
etree_type *exp_trinop
(int,etree_type *, etree_type *, etree_type *);
etree_type *exp_unop
(int, etree_type *);
etree_type *exp_nameop
(int, const char *);
etree_type *exp_assign
(const char *, etree_type *, bfd_boolean);
etree_type *exp_defsym
(const char *, etree_type *);
etree_type *exp_provide
(const char *, etree_type *, bfd_boolean);
etree_type *exp_assert
(etree_type *, const char *);
void exp_print_tree
(etree_type *);
bfd_vma exp_get_vma
(etree_type *, bfd_vma, char *);
int exp_get_value_int
(etree_type *, int, char *);
fill_type *exp_get_fill
(etree_type *, fill_type *, char *);
bfd_vma exp_get_abs_int
(etree_type *, int, char *);
void ldexp_init (void);
void ldexp_finalize_syms (void);
void ldexp_finish (void);
#endif
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