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86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/* Support for dumping and reloading various pieces of GDB's internal state.
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Copyright 1992 Free Software Foundation, Inc.
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Contributed by Cygnus Support, using pieces from other GDB modules.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This file provides definitions used for reading and writing gdb
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state files. State files have a fairly simple form which is intended
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to be easily extensible. See state.c for further documentation. */
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#if !defined (_STATE_H)
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#define _STATE_H
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/* State file-header */
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typedef struct {
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unsigned char sf_mag0; /* Magic number byte 0 */
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unsigned char sf_mag1; /* Magic number byte 1 */
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unsigned char sf_mag2; /* Magic number byte 2 */
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unsigned char sf_mag3; /* Magic number byte 3 */
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unsigned long sf_ftoff; /* File offset to start of form-tree */
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unsigned long sf_ftsize; /* Size of the form-tree, in bytes */
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} sf_hdr;
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#define SF_MAG0 'g' /* Magic number byte 0 value */
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#define SF_MAG1 'd' /* Magic number byte 1 value */
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#define SF_MAG2 'b' /* Magic number byte 2 value */
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#define SF_MAG3 '\000' /* Magic number byte 3 value */
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#define SF_GOOD_MAGIC(asfd) ((asfd) -> hdr.sf_mag0 == SF_MAG0 && \
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(asfd) -> hdr.sf_mag1 == SF_MAG1 && \
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(asfd) -> hdr.sf_mag2 == SF_MAG2 && \
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(asfd) -> hdr.sf_mag3 == SF_MAG3)
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/* The internal form-tree is formed from nodes that contain pointers
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to the first sibling, the first child, a backpointer to the parent,
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and a pointer to the actual data for the node. This allows all
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tree nodes to have the same sized structure, but support variable
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numbers of child nodes per parent node. The backpointer for the
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parent is required for simplier tree walks. */
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struct formnode
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{
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struct formnode *sibling; /* Pointer to first sibling */
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struct formnode *child; /* Pointer to first child */
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struct formnode *parent; /* Backpointer to parent */
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char *nodedata; /* Pointer to the nodes data */
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unsigned long treesize; /* Size of subtree rooted here */
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};
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/* A state file descriptor is defined by the following structure. */
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typedef struct
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{
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char *filename; /* Full pathname of the state file */
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FILE *fp; /* Open file pointer for the state file */
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sf_hdr hdr; /* Copy of the state file-header */
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char *formtree; /* Pointer to in-memory copy of form-tree */
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} sfd;
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extern sfd *
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sfd_fopen PARAMS ((char *, char *));
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extern void
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sfd_fclose PARAMS ((sfd *));
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extern struct objfile *
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objfile_from_statefile PARAMS ((sfd *));
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#endif /* !defined (_STATE_H) */
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