Add symbol table support
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1918 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
parent
66c91ff194
commit
57deccf919
@ -40,6 +40,7 @@
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <string.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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121
binfmt/symtab_findbyvalue.c
Normal file
121
binfmt/symtab_findbyvalue.c
Normal file
@ -0,0 +1,121 @@
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/****************************************************************************
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* binfmt/symtab_findbyvalue.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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||||
* are met:
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||||
*
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||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
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||||
*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/symtab.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/***********************************************************************
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* Public Functions
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***********************************************************************/
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/****************************************************************************
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* Name: symtab_findbyvalue
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*
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* Description:
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* Find the symbol in the symbol table whose value closest (but not greater
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* than), the provided value. This version assumes that table is not ordered
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* with respect to symbol name and, hence, access time will be linear with
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* respect to nsyms.
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*
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* Returned Value:
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* A reference to the symbol table entry if an entry with the matching
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* name is found; NULL is returned if the entry is not found.
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*
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****************************************************************************/
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FAR const struct symtab_s *
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symtab_findbyvalue(FAR const struct symtab_s *symtab,
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FAR void *value, int nsyms)
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{
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FAR const struct symtab_s *retval = NULL;
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DEBUGASSERT(symtab != NULL);
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for (; nsyms > 0; symtab++, nsyms--)
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{
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/* Look for symbols of lesser or equal value (probably address) to value */
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if (symtab->sym_value <= value)
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{
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/* Found one. Is it the largest we have found so far? */
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if (!retval || symtab->sym_value > retval->sym_value)
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{
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/* Yes, then it is the new candidate for the symbol whose value
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* just below 'value'
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*/
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retval = symtab;
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/* If it is exactly equal to the search 'value', then we might as
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* well terminate early because we can't do any better than that.
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*/
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if (retval->sym_value == value)
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{
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break;
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}
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}
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}
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}
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return retval;
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}
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140
binfmt/symtab_findorderedbyname.c
Normal file
140
binfmt/symtab_findorderedbyname.c
Normal file
@ -0,0 +1,140 @@
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/****************************************************************************
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* binfmt/symtab_findorderedbyname.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
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||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
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* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <string.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/symtab.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/***********************************************************************
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* Public Functions
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***********************************************************************/
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/****************************************************************************
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* Name: symtab_findorderedbyname
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*
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* Description:
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* Find the symbol in the symbol table with the matching name.
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* This version assumes that table ordered with respect to symbol name.
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*
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* This function uses qsort() to implement the search and, hence, is a lot
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* larger than symbtab_findbyname(). This function not be used, unless
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* the symbol table is large and the performance benefit is worth the
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* increased size.
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*
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* Returned Value:
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* A reference to the symbol table entry if an entry with the matching
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* name is found; NULL is returned if the entry is not found.
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*
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****************************************************************************/
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FAR const struct symtab_s *
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symtab_findorderedbyname(FAR const struct symtab_s *symtab,
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FAR const char *name, int nsyms)
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{
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int low = 0;
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int high = nsyms -1;
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int mid;
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int cmp;
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/* Loop until the range has been isolated to a single symbol table
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* entry that may or may not match the search name.
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*/
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DEBUGASSERT(symtab != NULL && name != NULL);
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while (low < high)
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{
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/* Compare the name to the one in the middle. (or just below
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* the middle in the case where one is even and one is odd).
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*/
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mid = (low + high) >> 1;
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cmp = strcmp(name, symtab[mid].sym_name);
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if (cmp < 0)
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{
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/* name < symtab[mid].sym_name */
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high = mid - 1;
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}
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else if (cmp > 0)
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{
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/* name > symtab[mid].sym_name */
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low = mid + 1;
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}
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else
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{
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/* symtab[mid].sym_name == name */
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return &symtab[mid];
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}
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}
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/* low == high... One final check. We might not have actually tested
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* the final symtab[] name.
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*
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* Example: Only the last pass through loop, suppose low = 1, high = 2,
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* mid = 1, and symtab[high].sym_name == name. Then we would get here with
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* low = 2, high = 2, but symtab[2].sym_name was never tested.
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*/
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return strcmp(name, symtab[low].sym_name) == 0 ? &symtab[low] : NULL;
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}
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127
binfmt/symtab_findorderedbyvalue.c
Normal file
127
binfmt/symtab_findorderedbyvalue.c
Normal file
@ -0,0 +1,127 @@
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/****************************************************************************
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* binfmt/symtab_findorderedbyvalue.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
|
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* are met:
|
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*
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||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
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* the documentation and/or other materials provided with the
|
||||
* distribution.
|
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* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/symtab.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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||||
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/***********************************************************************
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* Public Functions
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***********************************************************************/
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/****************************************************************************
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* Name: symtab_findorderedbyvalue
|
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*
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* Description:
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* Find the symbol in the symbol table whose value closest (but not greater
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* than), the provided value. This version assumes that table is ordered
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* with respect to symbol name.
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*
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* Returned Value:
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* A reference to the symbol table entry if an entry with the matching
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* name is found; NULL is returned if the entry is not found.
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*
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****************************************************************************/
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FAR const struct symtab_s *
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symtab_findorderedbyvalue(FAR const struct symtab_s *symtab,
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FAR void *value, int nsyms)
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{
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int low = 0;
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int high = nsyms -1;
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int mid;
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/* Loop until the range has been isolated to a single symbol table
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* entry that may or may not match the search name.
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*/
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DEBUGASSERT(symtab != NULL);
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while (low < high)
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{
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/* Compare the name to the one in the middle. (or just below
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* the middle in the case where one is even and one is odd).
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*/
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mid = (low + high) >> 1;
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if ( value < symtab[mid].sym_value)
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{
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high = mid - 1;
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}
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else if (value > symtab[mid].sym_value)
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{
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low = mid + 1;
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}
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else /* if (value == symtab[mid].sym_value) */
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{
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return &symtab[mid];
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}
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}
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/* low == high... One final check. We might not have actually tested
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* the final symtab[] name.
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*
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* Example: Only the last pass through loop, suppose low = 1, high = 2,
|
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* mid = 1, and symtab[high].sym_name == name. Then we would get here with
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* low = 2, high = 2, but symtab[2].sym_name was never tested.
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*/
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return value == symtab[low].sym_value ? &symtab[low] : NULL;
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}
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164
include/nuttx/symtab.h
Normal file
164
include/nuttx/symtab.h
Normal file
@ -0,0 +1,164 @@
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/****************************************************************************
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* include/nuttx/symtab.h
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
|
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
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*
|
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* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
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****************************************************************************/
|
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#ifndef __INCLUDE_NUTTX_SYMTAB_H
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#define __INCLUDE_NUTTX_SYMTAB_H
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/****************************************************************************
|
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* Included Files
|
||||
****************************************************************************/
|
||||
|
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#include <nuttx/config.h>
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#include <sys/types.h>
|
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|
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/****************************************************************************
|
||||
* Pre-processor Definitions
|
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****************************************************************************/
|
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|
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* struct symbtab_s describes one entry in the symbol table. A symbol table
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* is a fixed size array of struct symtab_s. The information is intentionally
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* minimal and supports only:
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*
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* 1. Function points as sym_values. Of other kinds of values need to be
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* supported, then typing information would also need to be included in
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* the structure.
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*
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* 2. Fixed size arrays. There is no explicit provisional for dyanamically
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* adding or removing entries from the symbol table (realloc might be
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* used for that purpose if needed). The intention is to support only
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* fixed size arrays completely defined at compilation or link time.
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*/
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struct symtab_s
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{
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FAR const char *sym_name; /* A pointer to the symbol name string */
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FAR const void *sym_value; /* The value associated witht the string */
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};
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/****************************************************************************
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* Public Functions
|
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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|
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/****************************************************************************
|
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* Name: symtab_findbyname
|
||||
*
|
||||
* Description:
|
||||
* Find the symbol in the symbol table with the matching name.
|
||||
* This version assumes that table is not ordered with respect to symbol
|
||||
* name and, hence, access time will be linear with respect to nsyms.
|
||||
*
|
||||
* Returned Value:
|
||||
* A reference to the symbol table entry if an entry with the matching
|
||||
* name is found; NULL is returned if the entry is not found.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
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EXTERN FAR const struct symtab_s *
|
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symtab_findbyname(FAR const struct symtab_s *symtab,
|
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FAR const char *name, int nsyms);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: symtab_findorderedbyname
|
||||
*
|
||||
* Description:
|
||||
* Find the symbol in the symbol table with the matching name.
|
||||
* This version assumes that table ordered with respect to symbol name.
|
||||
*
|
||||
* Returned Value:
|
||||
* A reference to the symbol table entry if an entry with the matching
|
||||
* name is found; NULL is returned if the entry is not found.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN FAR const struct symtab_s *
|
||||
symtab_findorderedbyname(FAR const struct symtab_s *symtab,
|
||||
FAR const char *name, int nsyms);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: symtab_findbyvalue
|
||||
*
|
||||
* Description:
|
||||
* Find the symbol in the symbol table whose value closest (but not greater
|
||||
* than), the provided value. This version assumes that table is not ordered
|
||||
* with respect to symbol name and, hence, access time will be linear with
|
||||
* respect to nsyms.
|
||||
*
|
||||
* Returned Value:
|
||||
* A reference to the symbol table entry if an entry with the matching
|
||||
* name is found; NULL is returned if the entry is not found.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN FAR const struct symtab_s *
|
||||
symtab_findbyvalue(FAR const struct symtab_s *symtab,
|
||||
FAR void *value, int nsyms);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: symtab_findorderedbyvalue
|
||||
*
|
||||
* Description:
|
||||
* Find the symbol in the symbol table whose value closest (but not greater
|
||||
* than), the provided value. This version assumes that table is ordered
|
||||
* with respect to symbol name.
|
||||
*
|
||||
* Returned Value:
|
||||
* A reference to the symbol table entry if an entry with the matching
|
||||
* name is found; NULL is returned if the entry is not found.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN FAR const struct symtab_s *
|
||||
symtab_findorderedbyvalue(FAR const struct symtab_s *symtab,
|
||||
FAR void *value, int nsyms);
|
||||
|
||||
#undef EXTERN
|
||||
#if defined(__cplusplus)
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* __INCLUDE_NUTTX_SYMTAB_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user