| 1 | /* DWARF 2 location expression support for GDB. |
| 2 | |
| 3 | Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010, 2011 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #if !defined (DWARF2LOC_H) |
| 22 | #define DWARF2LOC_H |
| 23 | |
| 24 | struct symbol_computed_ops; |
| 25 | struct objfile; |
| 26 | struct dwarf2_per_cu_data; |
| 27 | struct dwarf2_loclist_baton; |
| 28 | struct agent_expr; |
| 29 | struct axs_value; |
| 30 | |
| 31 | /* This header is private to the DWARF-2 reader. It is shared between |
| 32 | dwarf2read.c and dwarf2loc.c. */ |
| 33 | |
| 34 | /* Return the OBJFILE associated with the compilation unit CU. If CU |
| 35 | came from a separate debuginfo file, then the master objfile is |
| 36 | returned. */ |
| 37 | struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu); |
| 38 | |
| 39 | /* Return the address size given in the compilation unit header for CU. */ |
| 40 | CORE_ADDR dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *cu); |
| 41 | |
| 42 | /* Return the offset size given in the compilation unit header for CU. */ |
| 43 | int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *cu); |
| 44 | |
| 45 | /* Return the text offset of the CU. The returned offset comes from |
| 46 | this CU's objfile. If this objfile came from a separate debuginfo |
| 47 | file, then the offset may be different from the corresponding |
| 48 | offset in the parent objfile. */ |
| 49 | CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu); |
| 50 | |
| 51 | /* Find a particular location expression from a location list. */ |
| 52 | const gdb_byte *dwarf2_find_location_expression |
| 53 | (struct dwarf2_loclist_baton *baton, |
| 54 | size_t *locexpr_length, |
| 55 | CORE_ADDR pc); |
| 56 | |
| 57 | struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block |
| 58 | (unsigned int offset, struct dwarf2_per_cu_data *per_cu, |
| 59 | CORE_ADDR (*get_frame_pc) (void *baton), |
| 60 | void *baton); |
| 61 | |
| 62 | struct type *dwarf2_get_die_type (unsigned int die_offset, |
| 63 | struct dwarf2_per_cu_data *per_cu); |
| 64 | |
| 65 | /* Evaluate a location description, starting at DATA and with length |
| 66 | SIZE, to find the current location of variable of TYPE in the context |
| 67 | of FRAME. */ |
| 68 | |
| 69 | struct value *dwarf2_evaluate_loc_desc (struct type *type, |
| 70 | struct frame_info *frame, |
| 71 | const gdb_byte *data, |
| 72 | unsigned short size, |
| 73 | struct dwarf2_per_cu_data *per_cu); |
| 74 | |
| 75 | /* The symbol location baton types used by the DWARF-2 reader (i.e. |
| 76 | SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct |
| 77 | dwarf2_locexpr_baton" is for a symbol with a single location |
| 78 | expression; "struct dwarf2_loclist_baton" is for a symbol with a |
| 79 | location list. */ |
| 80 | |
| 81 | struct dwarf2_locexpr_baton |
| 82 | { |
| 83 | /* Pointer to the start of the location expression. */ |
| 84 | const gdb_byte *data; |
| 85 | |
| 86 | /* Length of the location expression. */ |
| 87 | unsigned long size; |
| 88 | |
| 89 | /* The compilation unit containing the symbol whose location |
| 90 | we're computing. */ |
| 91 | struct dwarf2_per_cu_data *per_cu; |
| 92 | }; |
| 93 | |
| 94 | struct dwarf2_loclist_baton |
| 95 | { |
| 96 | /* The initial base address for the location list, based on the compilation |
| 97 | unit. */ |
| 98 | CORE_ADDR base_address; |
| 99 | |
| 100 | /* Pointer to the start of the location list. */ |
| 101 | const gdb_byte *data; |
| 102 | |
| 103 | /* Length of the location list. */ |
| 104 | unsigned long size; |
| 105 | |
| 106 | /* The compilation unit containing the symbol whose location |
| 107 | we're computing. */ |
| 108 | struct dwarf2_per_cu_data *per_cu; |
| 109 | }; |
| 110 | |
| 111 | extern const struct symbol_computed_ops dwarf2_locexpr_funcs; |
| 112 | extern const struct symbol_computed_ops dwarf2_loclist_funcs; |
| 113 | |
| 114 | /* Compile a DWARF location expression to an agent expression. |
| 115 | |
| 116 | EXPR is the agent expression we are building. |
| 117 | LOC is the agent value we modify. |
| 118 | ARCH is the architecture. |
| 119 | ADDR_SIZE is the size of addresses, in bytes. |
| 120 | OP_PTR is the start of the location expression. |
| 121 | OP_END is one past the last byte of the location expression. |
| 122 | |
| 123 | This will throw an exception for various kinds of errors -- for |
| 124 | example, if the expression cannot be compiled, or if the expression |
| 125 | is invalid. */ |
| 126 | |
| 127 | extern void dwarf2_compile_expr_to_ax (struct agent_expr *expr, |
| 128 | struct axs_value *loc, |
| 129 | struct gdbarch *arch, |
| 130 | unsigned int addr_size, |
| 131 | const gdb_byte *op_ptr, |
| 132 | const gdb_byte *op_end, |
| 133 | struct dwarf2_per_cu_data *per_cu); |
| 134 | |
| 135 | #endif /* dwarf2loc.h */ |