Initial revision

1 files changed, 159 insertions, 0 deletions

diff --git a/gas/subsegs.h b/gas/subsegs.h
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+++ b/gas/subsegs.h
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+/* subsegs.h -> subsegs.c
+   Copyright (C) 1987, 92, 93, 94, 95, 96, 1998 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.  */
+
+/*
+ * For every sub-segment the user mentions in the ASsembler program,
+ * we make one struct frchain. Each sub-segment has exactly one struct frchain
+ * and vice versa.
+ *
+ * Struct frchain's are forward chained (in ascending order of sub-segment
+ * code number). The chain runs through frch_next of each subsegment.
+ * This makes it hard to find a subsegment's frags
+ * if programmer uses a lot of them. Most programs only use text0 and
+ * data0, so they don't suffer. At least this way:
+ * (1)	There are no "arbitrary" restrictions on how many subsegments
+ *	can be programmed;
+ * (2)	Subsegments' frchain-s are (later) chained together in the order in
+ *	which they are emitted for object file viz text then data.
+ *
+ * From each struct frchain dangles a chain of struct frags. The frags
+ * represent code fragments, for that sub-segment, forward chained.
+ */
+
+#include "obstack.h"
+
+struct frchain			/* control building of a frag chain */
+{				/* FRCH = FRagment CHain control */
+  struct frag *frch_root;	/* 1st struct frag in chain, or NULL */
+  struct frag *frch_last;	/* last struct frag in chain, or NULL */
+  struct frchain *frch_next;	/* next in chain of struct frchain-s */
+  segT frch_seg;		/* SEG_TEXT or SEG_DATA. */
+  subsegT frch_subseg;		/* subsegment number of this chain */
+#ifdef BFD_ASSEMBLER
+  fixS *fix_root;		/* Root of fixups for this subsegment.  */
+  fixS *fix_tail;		/* Last fixup for this subsegment.  */
+#endif
+  struct obstack frch_obstack;	/* for objects in this frag chain */
+  fragS *frch_frag_now;		/* frag_now for this subsegment */
+};
+
+typedef struct frchain frchainS;
+
+/* All subsegments' chains hang off here.  NULL means no frchains yet.  */
+extern frchainS *frchain_root;
+
+/* Frchain we are assembling into now.  That is, the current segment's
+   frag chain, even if it contains no (complete) frags. */
+extern frchainS *frchain_now;
+
+
+typedef struct segment_info_struct
+{
+  frchainS *frchainP;
+  unsigned int hadone : 1;
+
+  /* This field is set if this is a .bss section which does not really
+     have any contents.  Once upon a time a .bss section did not have
+     any frags, but that is no longer true.  This field prevent the
+     SEC_HAS_CONTENTS flag from being set for the section even if
+     there are frags.  */
+  unsigned int bss : 1;
+
+  int user_stuff;
+
+  /* Fixups for this segment.  If BFD_ASSEMBLER, this is only valid
+     after the frchains are run together.  */
+  fixS *fix_root;
+  fixS *fix_tail;
+
+#if defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
+  struct internal_scnhdr scnhdr;
+  enum linkonce_type linkonce;
+  const char *name;
+#endif
+
+  symbolS *dot;
+
+  struct lineno_list *lineno_list_head;
+  struct lineno_list *lineno_list_tail;
+
+#ifdef BFD_ASSEMBLER
+  /* Which BFD section does this gas segment correspond to?  */
+  asection *bfd_section;
+
+  /* NULL, or pointer to the gas symbol that is the section symbol for
+     this section.  sym->bsym and bfd_section->symbol should be the same.  */
+  symbolS *sym;
+#endif
+
+  union
+    {
+      /* Current size of section holding stabs strings.  */
+      unsigned long stab_string_size;
+      /* Initial frag for ELF.  */
+      char *p;
+    }
+  stabu;
+
+#ifdef NEED_LITERAL_POOL
+  unsigned long literal_pool_size;
+#endif
+
+#ifdef TC_SEGMENT_INFO_TYPE
+  TC_SEGMENT_INFO_TYPE tc_segment_info_data;
+#endif
+} segment_info_type;
+
+#ifdef BFD_ASSEMBLER
+
+extern segment_info_type *seg_info PARAMS ((segT));
+extern symbolS *section_symbol PARAMS ((segT));
+
+#else /* ! BFD_ASSEMBLER */
+
+#ifdef MANY_SEGMENTS
+
+extern segment_info_type segment_info[];
+
+#define seg_info(SEC)	(&segment_info[SEC])
+
+#else
+
+/* Sentinel for frchain crawling.  Points to the 1st data-segment
+   frchain.  (Which is pointed to by the last text-segment frchain.) */
+extern frchainS *data0_frchainP;
+extern frchainS *bss0_frchainP;
+
+/* Dummy so stuff can compile.  Should never be used.  */
+struct seg_info_trash {
+  struct {
+    unsigned stab_string_size : 1;
+  } stabu;
+  unsigned hadone : 1;
+};
+#define seg_info(S)	(abort (), (struct seg_info_trash *) 0)
+
+#endif
+
+#endif /* ! BFD_ASSEMBLER */
+
+extern void subsegs_print_statistics PARAMS ((FILE *));
+
+/* end of subsegs.h */