projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| cfc14b3a MK |
1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
| 2 | ||
| 05cbe71a | 3 | Copyright 2003, 2004 Free Software Foundation, Inc. |
| cfc14b3a MK |
4 | |
| 5 | Contributed by Mark Kettenis. | |
| 6 | ||
| 7 | This file is part of GDB. | |
| 8 | ||
| 9 | This program is free software; you can redistribute it and/or modify | |
| 10 | it under the terms of the GNU General Public License as published by | |
| 11 | the Free Software Foundation; either version 2 of the License, or | |
| 12 | (at your option) any later version. | |
| 13 | ||
| 14 | This program is distributed in the hope that it will be useful, | |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 | GNU General Public License for more details. | |
| 18 | ||
| 19 | You should have received a copy of the GNU General Public License | |
| 20 | along with this program; if not, write to the Free Software | |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
| 22 | Boston, MA 02111-1307, USA. */ | |
| 23 | ||
| 24 | #ifndef DWARF2_FRAME_H | |
| 25 | #define DWARF2_FRAME_H 1 | |
| 26 | ||
| 27 | struct objfile; | |
| e6e5e94c | 28 | struct frame_info; |
| cfc14b3a | 29 | |
| 05cbe71a MK |
30 | /* Register rule. */ |
| 31 | ||
| 32 | enum dwarf2_frame_reg_rule | |
| 33 | { | |
| 34 | /* Make certain that 0 maps onto the correct enum value; the | |
| 35 | corresponding structure is being initialized using memset zero. | |
| 36 | This indicates that CFI didn't provide any information at all | |
| 37 | about a register, leaving how to obtain its value totally | |
| 38 | unspecified. */ | |
| 39 | DWARF2_FRAME_REG_UNSPECIFIED = 0, | |
| 40 | ||
| 41 | /* The term "undefined" comes from the DWARF2 CFI spec which this | |
| 42 | code is moddeling; it indicates that the register's value is | |
| 43 | "undefined". GCC uses the less formal term "unsaved". Its | |
| 44 | definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED. | |
| 45 | The failure to differentiate the two helps explain a few problems | |
| 46 | with the CFI generated by GCC. */ | |
| 47 | DWARF2_FRAME_REG_UNDEFINED, | |
| 48 | DWARF2_FRAME_REG_SAVED_OFFSET, | |
| 49 | DWARF2_FRAME_REG_SAVED_REG, | |
| 50 | DWARF2_FRAME_REG_SAVED_EXP, | |
| 51 | DWARF2_FRAME_REG_SAME_VALUE, | |
| 52 | ||
| 53 | /* These aren't defined by the DWARF2 CFI specification, but are | |
| 54 | used internally by GDB. */ | |
| 55 | DWARF2_FRAME_REG_RA, /* Return Address. */ | |
| 56 | DWARF2_FRAME_REG_CFA /* Call Frame Address. */ | |
| 57 | }; | |
| 58 | ||
| 59 | /* Register state. */ | |
| 60 | ||
| 61 | struct dwarf2_frame_state_reg | |
| 62 | { | |
| 63 | /* Each register save state can be described in terms of a CFA slot, | |
| 64 | another register, or a location expression. */ | |
| 65 | union { | |
| 66 | LONGEST offset; | |
| 67 | ULONGEST reg; | |
| 68 | unsigned char *exp; | |
| 69 | } loc; | |
| 70 | ULONGEST exp_len; | |
| 71 | enum dwarf2_frame_reg_rule how; | |
| 72 | }; | |
| 73 | ||
| cfc14b3a MK |
74 | /* Return the frame unwind methods for the function that contains PC, |
| 75 | or NULL if it can't be handled by DWARF CFI frame unwinder. */ | |
| 76 | ||
| 05cbe71a MK |
77 | extern const struct frame_unwind * |
| 78 | dwarf2_frame_sniffer (struct frame_info *next_frame); | |
| cfc14b3a MK |
79 | |
| 80 | /* Return the frame base methods for the function that contains PC, or | |
| 81 | NULL if it can't be handled by the DWARF CFI frame unwinder. */ | |
| 82 | ||
| 05cbe71a MK |
83 | extern const struct frame_base * |
| 84 | dwarf2_frame_base_sniffer (struct frame_info *next_frame); | |
| cfc14b3a MK |
85 | |
| 86 | /* Register the DWARF CFI for OBJFILE. */ | |
| 87 | ||
| 88 | void dwarf2_frame_build_info (struct objfile *objfile); | |
| 89 | ||
| 90 | #endif /* dwarf2-frame.h */ |