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Diffstat (limited to 'binutils-2.25/gas/frags.h')
| -rw-r--r-- | binutils-2.25/gas/frags.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/binutils-2.25/gas/frags.h b/binutils-2.25/gas/frags.h new file mode 100644 index 00000000..f5846be5 --- /dev/null +++ b/binutils-2.25/gas/frags.h @@ -0,0 +1,160 @@ +/* frags.h - Header file for the frag concept. + Copyright 1987, 1992, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001, + 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2011, 2012 + 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA + 02110-1301, USA. */ + +#ifndef FRAGS_H +#define FRAGS_H + +struct obstack; + +/* 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 { + /* Object file address (as an octet offset). */ + addressT fr_address; + /* When relaxing multiple times, remember the address the frag had + in the last relax pass. */ + addressT last_fr_address; + + /* (Fixed) number of octets we know we have. May be 0. */ + 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. */ + offsetT fr_var; + /* For variable-length tail. */ + offsetT fr_offset; + /* For variable-length tail. */ + symbolS *fr_symbol; + /* Points to opcode low addr byte, for relaxation. */ + char *fr_opcode; + + /* Chain forward; ascending address order. Rooted in frch_root. */ + struct frag *fr_next; + + /* Where the frag was created, or where it became a variant frag. */ + char *fr_file; + unsigned int fr_line; + +#ifndef NO_LISTING + struct list_info_struct *line; +#endif + + /* A serial number for a sequence of frags having at most one alignment + or org frag, and that at the tail of the sequence. */ + unsigned int region:16; + + /* Flipped each relax pass so we can easily determine whether + fr_address has been adjusted. */ + unsigned int relax_marker:1; + + /* Used to ensure that all insns are emitted on proper address + boundaries. */ + unsigned int has_code:1; + unsigned int insn_addr:6; + + /* 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 +#ifdef OBJ_FRAG_TYPE + OBJ_FRAG_TYPE obj_frag_data; +#endif + + /* 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 (void); +extern addressT frag_now_fix_octets (void); + +/* For foreign-segment symbol fixups. */ +COMMON fragS zero_address_frag; +COMMON fragS predefined_address_frag; + +extern void frag_append_1_char (int); +#define FRAG_APPEND_1_CHAR(X) frag_append_1_char (X) + +void frag_init (void); +fragS *frag_alloc (struct obstack *); +void frag_grow (unsigned int nchars); +char *frag_more (int nchars); +void frag_align (int alignment, int fill_character, int max); +void frag_align_pattern (int alignment, const char *fill_pattern, + int n_fill, int max); +void frag_align_code (int alignment, int max); +void frag_new (int old_frags_var_max_size); +void frag_wane (fragS * fragP); +int frag_room (void); + +char *frag_variant (relax_stateT type, + int max_chars, + int var, + relax_substateT subtype, + symbolS * symbol, + offsetT offset, + char *opcode); + +char *frag_var (relax_stateT type, + int max_chars, + int var, + relax_substateT subtype, + symbolS * symbol, + offsetT offset, + char *opcode); + +bfd_boolean frag_offset_fixed_p (const fragS *, const fragS *, offsetT *); + +#endif /* FRAGS_H */ |