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100 lines
3.8 KiB
C
100 lines
3.8 KiB
C
/* Public attributes of the .gdb_index section.
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Copyright (C) 2012-2016 Free Software Foundation, Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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/* This file contains values for understanding the .gdb_index section
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needed by more than just GDB, e.g. readelf. */
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#ifndef GDB_INDEX_H
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#define GDB_INDEX_H
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/* Each symbol in .gdb_index refers to a set of CUs that defines the symbol.
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Each CU is represented by a 32 bit number that is the index of the CU in
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the CU table, plus some attributes of the use of the symbol in that CU.
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The values are defined such that if all the bits are zero, then no
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special meaning is assigned to any of them. This is done to preserve
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compatibility with older indices. The way this is done is to specify
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that if the GDB_INDEX_SYMBOL_KIND value is zero then all other attribute
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bits must be zero.
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0-23 CU index
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24-27 reserved
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28-30 symbol kind
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31 0 == global, 1 == static
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Bits 24-27 are reserved because it's easier to relax restrictions than
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it is to impose them after the fact. At present 24 bits to represent
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the CU index is plenty. If we need more bits for the CU index or for
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attributes then we have them. */
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/* Whether the symbol is in GLOBAL_BLOCK (== 0) or STATIC_BLOCK (== 1). */
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#define GDB_INDEX_SYMBOL_STATIC_SHIFT 31
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#define GDB_INDEX_SYMBOL_STATIC_MASK 1
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#define GDB_INDEX_SYMBOL_STATIC_VALUE(cu_index) \
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(((cu_index) >> GDB_INDEX_SYMBOL_STATIC_SHIFT) & GDB_INDEX_SYMBOL_STATIC_MASK)
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#define GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
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do { \
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(cu_index) |= (((value) & GDB_INDEX_SYMBOL_STATIC_MASK) \
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<< GDB_INDEX_SYMBOL_STATIC_SHIFT); \
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} while (0)
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/* The kind of the symbol.
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We don't use GDB's internal values as these numbers are published
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so that other tools can build and read .gdb_index. */
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typedef enum {
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/* Special value to indicate no attributes are present. */
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GDB_INDEX_SYMBOL_KIND_NONE = 0,
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GDB_INDEX_SYMBOL_KIND_TYPE = 1,
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GDB_INDEX_SYMBOL_KIND_VARIABLE = 2,
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GDB_INDEX_SYMBOL_KIND_FUNCTION = 3,
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GDB_INDEX_SYMBOL_KIND_OTHER = 4,
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/* We currently allocate 3 bits to record the symbol kind.
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Give the unused bits a value so gdb will print them sensibly. */
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GDB_INDEX_SYMBOL_KIND_UNUSED5 = 5,
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GDB_INDEX_SYMBOL_KIND_UNUSED6 = 6,
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GDB_INDEX_SYMBOL_KIND_UNUSED7 = 7
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} gdb_index_symbol_kind;
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#define GDB_INDEX_SYMBOL_KIND_SHIFT 28
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#define GDB_INDEX_SYMBOL_KIND_MASK 7
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#define GDB_INDEX_SYMBOL_KIND_VALUE(cu_index) \
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((gdb_index_symbol_kind) (((cu_index) >> GDB_INDEX_SYMBOL_KIND_SHIFT) \
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& GDB_INDEX_SYMBOL_KIND_MASK))
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#define GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
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do { \
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(cu_index) |= (((value) & GDB_INDEX_SYMBOL_KIND_MASK) \
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<< GDB_INDEX_SYMBOL_KIND_SHIFT); \
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} while (0)
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#define GDB_INDEX_RESERVED_SHIFT 24
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#define GDB_INDEX_RESERVED_MASK 15
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#define GDB_INDEX_RESERVED_VALUE(cu_index) \
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(((cu_index) >> GDB_INDEX_RESERVED_SHIFT) & GDB_INDEX_RESERVED_MASK)
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/* CU index. */
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#define GDB_INDEX_CU_BITSIZE 24
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#define GDB_INDEX_CU_MASK ((1 << GDB_INDEX_CU_BITSIZE) - 1)
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#define GDB_INDEX_CU_VALUE(cu_index) ((cu_index) & GDB_INDEX_CU_MASK)
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#define GDB_INDEX_CU_SET_VALUE(cu_index, value) \
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do { \
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(cu_index) |= (value) & GDB_INDEX_CU_MASK; \
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} while (0)
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#endif /* GDB_INDEX_H */
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