100 lines
3.8 KiB
C
100 lines
3.8 KiB
C
/* Public attributes of the .gdb_index section.
|
|
Copyright 2012 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program 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 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
/* This file contains values for understanding the .gdb_index section
|
|
needed by more than just GDB, e.g. readelf. */
|
|
|
|
#ifndef GDB_INDEX_H
|
|
#define GDB_INDEX_H
|
|
|
|
/* Each symbol in .gdb_index refers to a set of CUs that defines the symbol.
|
|
Each CU is represented by a 32 bit number that is the index of the CU in
|
|
the CU table, plus some attributes of the use of the symbol in that CU.
|
|
|
|
The values are defined such that if all the bits are zero, then no
|
|
special meaning is assigned to any of them. This is done to preserve
|
|
compatibility with older indices. The way this is done is to specify
|
|
that if the GDB_INDEX_SYMBOL_KIND value is zero then all other attribute
|
|
bits must be zero.
|
|
|
|
0-23 CU index
|
|
24-27 reserved
|
|
28-30 symbol kind
|
|
31 0 == global, 1 == static
|
|
|
|
Bits 24-27 are reserved because it's easier to relax restrictions than
|
|
it is to impose them after the fact. At present 24 bits to represent
|
|
the CU index is plenty. If we need more bits for the CU index or for
|
|
attributes then we have them. */
|
|
|
|
/* Whether the symbol is in GLOBAL_BLOCK (== 0) or STATIC_BLOCK (== 1). */
|
|
#define GDB_INDEX_SYMBOL_STATIC_SHIFT 31
|
|
#define GDB_INDEX_SYMBOL_STATIC_MASK 1
|
|
#define GDB_INDEX_SYMBOL_STATIC_VALUE(cu_index) \
|
|
(((cu_index) >> GDB_INDEX_SYMBOL_STATIC_SHIFT) & GDB_INDEX_SYMBOL_STATIC_MASK)
|
|
#define GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
|
|
do { \
|
|
(cu_index) |= (((value) & GDB_INDEX_SYMBOL_STATIC_MASK) \
|
|
<< GDB_INDEX_SYMBOL_STATIC_SHIFT); \
|
|
} while (0)
|
|
|
|
/* The kind of the symbol.
|
|
We don't use GDB's internal values as these numbers are published
|
|
so that other tools can build and read .gdb_index. */
|
|
|
|
typedef enum {
|
|
/* Special value to indicate no attributes are present. */
|
|
GDB_INDEX_SYMBOL_KIND_NONE = 0,
|
|
GDB_INDEX_SYMBOL_KIND_TYPE = 1,
|
|
GDB_INDEX_SYMBOL_KIND_VARIABLE = 2,
|
|
GDB_INDEX_SYMBOL_KIND_FUNCTION = 3,
|
|
GDB_INDEX_SYMBOL_KIND_OTHER = 4,
|
|
/* We currently allocate 3 bits to record the symbol kind.
|
|
Give the unused bits a value so gdb will print them sensibly. */
|
|
GDB_INDEX_SYMBOL_KIND_UNUSED5 = 5,
|
|
GDB_INDEX_SYMBOL_KIND_UNUSED6 = 6,
|
|
GDB_INDEX_SYMBOL_KIND_UNUSED7 = 7
|
|
} gdb_index_symbol_kind;
|
|
|
|
#define GDB_INDEX_SYMBOL_KIND_SHIFT 28
|
|
#define GDB_INDEX_SYMBOL_KIND_MASK 7
|
|
#define GDB_INDEX_SYMBOL_KIND_VALUE(cu_index) \
|
|
((gdb_index_symbol_kind) (((cu_index) >> GDB_INDEX_SYMBOL_KIND_SHIFT) \
|
|
& GDB_INDEX_SYMBOL_KIND_MASK))
|
|
#define GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
|
|
do { \
|
|
(cu_index) |= (((value) & GDB_INDEX_SYMBOL_KIND_MASK) \
|
|
<< GDB_INDEX_SYMBOL_KIND_SHIFT); \
|
|
} while (0)
|
|
|
|
#define GDB_INDEX_RESERVED_SHIFT 24
|
|
#define GDB_INDEX_RESERVED_MASK 15
|
|
#define GDB_INDEX_RESERVED_VALUE(cu_index) \
|
|
(((cu_index) >> GDB_INDEX_RESERVED_SHIFT) & GDB_INDEX_RESERVED_MASK)
|
|
|
|
/* CU index. */
|
|
#define GDB_INDEX_CU_BITSIZE 24
|
|
#define GDB_INDEX_CU_MASK ((1 << GDB_INDEX_CU_BITSIZE) - 1)
|
|
#define GDB_INDEX_CU_VALUE(cu_index) ((cu_index) & GDB_INDEX_CU_MASK)
|
|
#define GDB_INDEX_CU_SET_VALUE(cu_index, value) \
|
|
do { \
|
|
(cu_index) |= (value) & GDB_INDEX_CU_MASK; \
|
|
} while (0)
|
|
|
|
#endif /* GDB_INDEX_H */
|