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/* Find a named variable or parameter within given scopes.
Copyright (C) 2005 Red Hat, Inc.
This program is Open Source software; you can redistribute it and/or
modify it under the terms of the Open Software License version 1.0 as
published by the Open Source Initiative.
You should have received a copy of the Open Software License along
with this program; if not, you may obtain a copy of the Open Software
License version 1.0 from http://www.opensource.org/licenses/osl.php or
by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
3001 King Ranch Road, Ukiah, CA 95482. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdbool.h>
#include <string.h>
#include "libdwP.h"
#include <dwarf.h>
/* Find the containing CU's files. */
static int
getfiles (Dwarf_Die *die, Dwarf_Files **files)
{
return INTUSE(dwarf_getsrcfiles) (&CUDIE (die->cu), files, NULL);
}
/* Fetch an attribute that should have a constant integer form. */
static int
getattr (Dwarf_Die *die, int search_name, Dwarf_Word *value)
{
Dwarf_Attribute attr_mem;
return INTUSE(dwarf_formudata) (INTUSE(dwarf_attr) (die, search_name,
&attr_mem), value);
}
/* Search SCOPES[0..NSCOPES-1] for a variable called NAME.
Ignore the first SKIP_SHADOWS scopes that match the name.
If MATCH_FILE is not null, accept only declaration in that source file;
if MATCH_LINENO or MATCH_LINECOL are also nonzero, accept only declaration
at that line and column.
If successful, fill in *RESULT with the DIE of the variable found,
and return N where SCOPES[N] is the scope defining the variable.
Return -1 for errors or -2 for no matching variable found. */
int
dwarf_getscopevar (Dwarf_Die *scopes, int nscopes,
const char *name, int skip_shadows,
const char *match_file, int match_lineno, int match_linecol,
Dwarf_Die *result)
{
/* Match against the given file name. */
size_t match_file_len = match_file == NULL ? 0 : strlen (match_file);
bool lastfile_matches = false;
const char *lastfile = NULL;
inline bool file_matches (Dwarf_Files *files, size_t idx)
{
if (idx >= files->nfiles)
return false;
const char *file = files->info[idx].name;
if (file != lastfile)
{
size_t len = strlen (file);
lastfile_matches = (len >= match_file_len
&& !memcmp (match_file, file, match_file_len)
&& (len == match_file_len
|| file[len - match_file_len - 1] == '/'));
}
return lastfile_matches;
}
/* Start with the innermost scope and move out. */
for (int out = 0; out < nscopes; ++out)
if (INTUSE(dwarf_haschildren) (&scopes[out]))
{
if (INTUSE(dwarf_child) (&scopes[out], result) != 0)
return -1;
do
{
switch (INTUSE(dwarf_tag) (result))
{
case DW_TAG_variable:
case DW_TAG_formal_parameter:
break;
default:
continue;
}
/* Only get here for a variable or parameter. Check the name. */
Dwarf_Attribute attr_mem;
const char *diename = INTUSE(dwarf_formstring)
(INTUSE(dwarf_attr_integrate) (result, DW_AT_name, &attr_mem));
if (diename != NULL && !strcmp (name, diename))
{
/* We have a matching name. */
if (skip_shadows > 0)
{
/* Punt this scope for the one it shadows. */
--skip_shadows;
break;
}
if (match_file != NULL)
{
/* Check its decl_file. */
Dwarf_Word i;
Dwarf_Files *files;
if (getattr (result, DW_AT_decl_file, &i) != 0
|| getfiles (&scopes[out], &files) != 0)
break;
if (!file_matches (files, i))
break;
if (match_lineno > 0
&& (getattr (result, DW_AT_decl_line, &i) != 0
|| (int) i != match_lineno))
break;
if (match_linecol > 0
&& (getattr (result, DW_AT_decl_column, &i) != 0
|| (int) i != match_linecol))
break;
}
/* We have a winner! */
return out;
}
}
while (INTUSE(dwarf_siblingof) (result, result) == 0);
}
return -2;
}
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