0,0 → 1,99 |
/* Public attributes of the .gdb_index section. |
Copyright 2012-2013 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 |
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. |
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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. |
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You should have received a copy of the GNU General Public License |
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 |
needed by more than just GDB, e.g. readelf. */ |
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#ifndef GDB_INDEX_H |
#define GDB_INDEX_H |
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/* 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. |
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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. |
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0-23 CU index |
24-27 reserved |
28-30 symbol kind |
31 0 == global, 1 == static |
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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. */ |
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/* 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) |
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/* 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. */ |
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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; |
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#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) |
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#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) |
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/* 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) |
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#endif /* GDB_INDEX_H */ |