1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/* 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)
{
Dwarf_Die cudie =
{
.cu = die->cu,
.addr = ((char *) die->cu->dbg->sectiondata[IDX_debug_info]->d_buf
+ 3 * die->cu->offset_size - 4 + 3),
};
return INTUSE(dwarf_getsrcfiles) (&cudie, 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;
}
|
