| 1 | /* Copyright (C) 2011-2020 Free Software Foundation, Inc. |
| 2 | |
| 3 | This file is part of GDB. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* Reasons why frames could not be further unwound |
| 19 | SET (name, description) |
| 20 | |
| 21 | After this reason name, all reasons should be considered errors; |
| 22 | i.e.: abnormal stack termination. |
| 23 | FIRST_ERROR (name) |
| 24 | |
| 25 | First and Last reason defined |
| 26 | FIRST_ENTRY (name) |
| 27 | LAST_ENTRY (name) */ |
| 28 | |
| 29 | #ifdef SET |
| 30 | /* No particular reason; either we haven't tried unwinding yet, |
| 31 | or we didn't fail. */ |
| 32 | SET (UNWIND_NO_REASON, "no reason") |
| 33 | |
| 34 | /* This is no longer used anywhere, but it's kept because it's exposed |
| 35 | to Python. This is how GDB used to indicate end of stack. We've |
| 36 | now migrated to a model where frames always have a valid ID. */ |
| 37 | SET (UNWIND_NULL_ID, "unwinder did not report frame ID") |
| 38 | |
| 39 | /* This frame is the outermost. */ |
| 40 | SET (UNWIND_OUTERMOST, "outermost") |
| 41 | |
| 42 | /* Can't unwind further, because that would require knowing the |
| 43 | values of registers or memory that haven't been collected. */ |
| 44 | SET (UNWIND_UNAVAILABLE, \ |
| 45 | "not enough registers or memory available to unwind further") |
| 46 | |
| 47 | /* This frame ID looks like it ought to belong to a NEXT frame, |
| 48 | but we got it for a PREV frame. Normally, this is a sign of |
| 49 | unwinder failure. It could also indicate stack corruption. */ |
| 50 | SET (UNWIND_INNER_ID, "previous frame inner to this frame (corrupt stack?)") |
| 51 | |
| 52 | /* This frame has the same ID as the previous one. That means |
| 53 | that unwinding further would almost certainly give us another |
| 54 | frame with exactly the same ID, so break the chain. Normally, |
| 55 | this is a sign of unwinder failure. It could also indicate |
| 56 | stack corruption. */ |
| 57 | SET (UNWIND_SAME_ID, "previous frame identical to this frame (corrupt stack?)") |
| 58 | |
| 59 | /* The frame unwinder didn't find any saved PC, but we needed |
| 60 | one to unwind further. */ |
| 61 | SET (UNWIND_NO_SAVED_PC, "frame did not save the PC") |
| 62 | |
| 63 | /* There was an error accessing memory while unwinding this frame. */ |
| 64 | SET (UNWIND_MEMORY_ERROR, "memory error while unwinding") |
| 65 | |
| 66 | #endif /* SET */ |
| 67 | |
| 68 | |
| 69 | #ifdef FIRST_ERROR |
| 70 | FIRST_ERROR (UNWIND_UNAVAILABLE) |
| 71 | #endif |
| 72 | |
| 73 | #ifdef FIRST_ENTRY |
| 74 | FIRST_ENTRY (UNWIND_NO_REASON) |
| 75 | #endif |
| 76 | |
| 77 | #ifdef LAST_ENTRY |
| 78 | LAST_ENTRY (UNWIND_MEMORY_ERROR) |
| 79 | #endif |