diff options
Diffstat (limited to 'include/gdb')
| -rw-r--r-- | include/gdb/ChangeLog | 4 | ||||
| -rw-r--r-- | include/gdb/gdb-index.h | 99 |
2 files changed, 103 insertions, 0 deletions
diff --git a/include/gdb/ChangeLog b/include/gdb/ChangeLog index 3afa67d..833f913 100644 --- a/include/gdb/ChangeLog +++ b/include/gdb/ChangeLog @@ -1,3 +1,7 @@ +2012-06-23 Doug Evans <dje@google.com> + + * gdb-index.h: New file. + 2012-05-24 Pedro Alves <palves@redhat.com> PR gdb/7205 diff --git a/include/gdb/gdb-index.h b/include/gdb/gdb-index.h new file mode 100644 index 0000000..92c3398 --- /dev/null +++ b/include/gdb/gdb-index.h @@ -0,0 +1,99 @@ +/* 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 */ |