binutils-gdb/gas/frags.h

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/* frags.h - Header file for the frag concept.
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Copyright (C) 1987, 92, 93, 94, 95, 97, 98, 99, 2000
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Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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 2, or (at your option)
any later version.
GAS 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 GAS; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#ifndef FRAGS_H
#define FRAGS_H
#ifdef ANSI_PROTOTYPES
struct obstack;
#endif
/*
* A code fragment (frag) is some known number of chars, followed by some
* unknown number of chars. Typically the unknown number of chars is an
* instruction address whose size is yet unknown. We always know the greatest
* possible size the unknown number of chars may become, and reserve that
* much room at the end of the frag.
* Once created, frags do not change address during assembly.
* We chain the frags in (a) forward-linked list(s). The object-file address
* of the 1st char of a frag is generally not known until after relax().
* Many things at assembly time describe an address by {object-file-address
* of a particular frag}+offset.
BUG: it may be smarter to have a single pointer off to various different
notes for different frag kinds. See how code pans
*/
struct frag
{
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/* Object file address (as an octet offset). */
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addressT fr_address;
/* Chain forward; ascending address order. Rooted in frch_root. */
struct frag *fr_next;
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/* (Fixed) number of octets we know we have. May be 0. */
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offsetT fr_fix;
/* May be used for (Variable) number of octets after above.
The generic frag handling code no longer makes any use of fr_var. */
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offsetT fr_var;
/* For variable-length tail. */
Add support for storing local symbols in a small structure to save memory when assembling large files. * as.h: Don't include struc-symbol.h. (symbolS): Add typedef. * symbols.c: Include struc-symbol.h. (local_hash): New static variable. (save_symbol_name): New static function, from symbol_create. (symbol_create): Call save_symbol_name. (local_symbol_count): New static variable. (local_symbol_conversion_count): Likewise. (LOCAL_SYMBOL_CHECK): Define. (local_symbol_make): New static function. (local_symbol_convert): New static function. (colon): Handle local symbols. Create local symbol for local label name. (symbol_table_insert): Handle local symbols. (symbol_find_or_make): Create local symbol for local label name. (symbol_find_base): Check for local symbol. (symbol_append, symbol_insert): Check for local symbols. (symbol_clear_list_pointers, symbol_remove): Likewise. (verify_symbol_chain): Likewise. (copy_symbol_attributes): Likewise. (resolve_symbol_value): Handle local symbols. (resolve_local_symbol): New static function. (resolve_local_symbol_values): New function. (S_GET_VALUE, S_SET_VALUE): Handle local symbols. (S_IS_FUNCTION, S_IS_EXTERNAL, S_IS_WEAK, S_IS_COMMON): Likewise. (S_IS_DEFINED, S_IS_DEBUG, S_IS_LOCAL, S_GET_NAME): Likewise. (S_GET_SEGMENT, S_SET_SEGMENT, S_SET_EXTERNAL): Likewise. (S_CLEAR_EXTERNAL, S_SET_WEAK, S_SET_NAME): Likewise. (symbol_previous, symbol_next): New functions. (symbol_get_value_expression): Likewise. (symbol_set_value_expression): Likewise. (symbol_set_frag, symbol_get_frag): Likewise. (symbol_mark_used, symbol_clear_used, symbol_used_p): Likewise. (symbol_mark_used_in_reloc): Likewise. (symbol_clear_used_in_reloc, symbol_used_in_reloc_p): Likewise. (symbol_mark_mri_common, symbol_clear_mri_common): Likewise. (symbol_mri_common_p): Likewise. (symbol_mark_written, symbol_clear_written): Likewise. (symbol_written_p): Likewise. (symbol_mark_resolved, symbol_resolved_p): Likewise. (symbol_section_p, symbol_equated_p): Likewise. (symbol_constant_p): Likewise. (symbol_get_bfdsym, symbol_set_bfdsym): Likewise. (symbol_get_obj, symbol_set_obj): Likewise. (symbol_get_tc, symbol_set_tc): Likewise. (symbol_begin): Initialize local_hash. (print_symbol_value_1): Handle local symbols. (symbol_print_statistics): Print local symbol statistics. * symbols.h: Include "struc-symbol.h" if not BFD_ASSEMBLER. Declare new symbols.c functions. Move many declarations here from struc-symbol.h. (SYMBOLS_NEED_BACKPOINTERS): Define if needed. * struc-symbol.h (SYMBOLS_NEED_BACKPOINTERS): Don't set. (struct symbol): Move bsym to make it clearly the first field. Remove TARGET_SYMBOL_FIELDS. (symbolS): Don't typedef. (struct broken_word): Remove. (N_TYPE_seg, seg_N_TYPE): Move to symbol.h. (SEGMENT_TO_SYMBOL_TYPE, N_REGISTER): Likewise. (symbol_clear_list_pointers): Likewise. (symbol_insert, symbol_remove): Likewise. (symbol_previous, symbol_append): Likewise. (verify_symbol_chain, verify_symbol_chain_2): Likewise. (struct local_symbol): Define. (local_symbol_converted_p, local_symbol_mark_converted): Define. (local_symbol_resolved_p, local_symbol_mark_resolved): Define. (local_symbol_get_frag, local_symbol_set_frag): Define. (local_symbol_get_real_symbol): Define. (local_symbol_set_real_symbol): Define. Define. * write.c (write_object_file): Call resolve_local_symbol_values. * config/obj-ecoff.h (OBJ_SYMFIELD_TYPE): Define. (TARGET_SYMBOL_FIELDS): Don't define. * config/obj-elf.h (OBJ_SYMFIELD_TYPE): Add local field. If ECOFF_DEBUGGING, add ECOFF fields. (ELF_TARGET_SYMBOL_FIELDS, TARGET_SYMBOL_FIELDS): Don't define. * config/obj-multi.h (struct elf_obj_sy): Add local field. If ECOFF_DEBUGGING, add ECOFF fields. (ELF_TARGET_SYMBOL_FIELDS, TARGET_SYMBOL_FIELDS): Don't define. (ECOFF_DEBUG_TARGET_SYMBOL_FIELDS): Don't define. * config/tc-mcore.h: Don't include struc-symbol.h. (TARGET_SYMBOL_FIELDS): Don't define. (struct mcore_tc_sy): Define. (TC_SYMFIELD_TYPE): Define. * Many files: Use symbolS instead of struct symbol. Use new accessor functions rather than referring to symbolS fields directly. * read.c (s_mri_common): Don't add in value of line_label. * config/tc-mips.c (md_apply_fix): Correct parenthesization when checking for SEC_LINK_ONCE. * config/tc-sh.h (sh_fix_adjustable): Declare.
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symbolS *fr_symbol;
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/* For variable-length tail. */
offsetT fr_offset;
/* Points to opcode low addr byte, for relaxation. */
char *fr_opcode;
#ifndef NO_LISTING
struct list_info_struct *line;
#endif
/* What state is my tail in? */
relax_stateT fr_type;
relax_substateT fr_subtype;
#ifdef USING_CGEN
/* Don't include this unless using CGEN to keep frag size down. */
struct {
/* CGEN_INSN entry for this instruction. */
const struct cgen_insn *insn;
/* Index into operand table. */
int opindex;
/* Target specific data, usually reloc number. */
int opinfo;
} fr_cgen;
#endif
#ifdef TC_FRAG_TYPE
TC_FRAG_TYPE tc_frag_data;
#endif
/* Where the frag was created, or where it became a variant frag. */
char *fr_file;
unsigned int fr_line;
/* Data begins here. */
char fr_literal[1];
};
#define SIZEOF_STRUCT_FRAG \
((char *)zero_address_frag.fr_literal-(char *)&zero_address_frag)
/* We want to say fr_literal[0] above. */
/* Current frag we are building. This frag is incomplete. It is,
however, included in frchain_now. The fr_fix field is bogus;
instead, use frag_now_fix (). */
COMMON fragS *frag_now;
extern addressT frag_now_fix PARAMS ((void));
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extern addressT frag_now_fix_octets PARAMS ((void));
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/* For foreign-segment symbol fixups. */
COMMON fragS zero_address_frag;
/* For local common (N_BSS segment) fixups. */
COMMON fragS bss_address_frag;
#if 0
/*
* A macro to speed up appending exactly 1 char
* to current frag.
*/
/* JF changed < 1 to <= 1 to avoid a race conditon */
#define FRAG_APPEND_1_CHAR(datum) \
{ \
if (obstack_room( &frags ) <= 1) {\
frag_wane (frag_now); \
frag_new (0); \
} \
obstack_1grow( &frags, datum ); \
}
#else
extern void frag_append_1_char PARAMS ((int));
#define FRAG_APPEND_1_CHAR(X) frag_append_1_char (X)
#endif
void frag_init PARAMS ((void));
fragS *frag_alloc PARAMS ((struct obstack *));
void frag_grow PARAMS ((unsigned int nchars));
char *frag_more PARAMS ((int nchars));
void frag_align PARAMS ((int alignment, int fill_character, int max));
void frag_align_pattern PARAMS ((int alignment,
const char *fill_pattern,
int n_fill,
int max));
void frag_new PARAMS ((int old_frags_var_max_size));
void frag_wane PARAMS ((fragS * fragP));
char *frag_variant PARAMS ((relax_stateT type,
int max_chars,
int var,
relax_substateT subtype,
symbolS * symbol,
offsetT offset,
char *opcode));
char *frag_var PARAMS ((relax_stateT type,
int max_chars,
int var,
relax_substateT subtype,
symbolS * symbol,
offsetT offset,
char *opcode));
#endif /* FRAGS_H */