| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | #include "stacktrace-array.h" |
| 4 | #include "stacktrace-common.h" |
| 5 | |
| 6 | // Initialize a stacktrace array |
| 7 | void stacktrace_array_init(STACKTRACE_ARRAY *array) { |
| 8 | if (unlikely(!array)) |
| 9 | return; |
| 10 | |
| 11 | spinlock_init(&array->spinlock); |
| 12 | array->num_stacktraces = 0; |
| 13 | memset(array->stacktraces, 0, sizeof(array->stacktraces)); |
| 14 | } |
| 15 | |
| 16 | // Add a stacktrace to an array (captures current stacktrace) |
| 17 | NEVER_INLINE |
| 18 | bool stacktrace_array_add(STACKTRACE_ARRAY *array, int skip_frames) { |
| 19 | if (unlikely(!array)) |
| 20 | return false; |
| 21 | |
| 22 | // Get current stacktrace |
| 23 | STACKTRACE current = stacktrace_get(skip_frames + 1); // +1 to skip this function |
| 24 | if (!current) |
| 25 | return false; |
| 26 | |
| 27 | bool added = false; |
| 28 | |
| 29 | // Protect the stacktraces array with a spinlock |
| 30 | spinlock_lock(&array->spinlock); |
| 31 | |
| 32 | // Check if this stacktrace already exists in the array |
| 33 | bool found = false; |
| 34 | for (int i = 0; i < array->num_stacktraces; i++) { |
| 35 | if (array->stacktraces[i] == current) { |
| 36 | found = true; |
| 37 | break; |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | // Add the stacktrace if it's unique and there's room |
| 42 | if (!found && array->num_stacktraces < STACKTRACE_ARRAY_MAX_TRACES) { |
| 43 | array->stacktraces[array->num_stacktraces++] = current; |
| 44 | added = true; |
| 45 | } |
| 46 | |
| 47 | spinlock_unlock(&array->spinlock); |
| 48 | |
| 49 | return added; |
| 50 | } |
| 51 | |
| 52 | // Report stacktraces to a buffer |
| 53 | size_t stacktrace_array_to_buffer(STACKTRACE_ARRAY *array, BUFFER *wb, size_t *total_count, const char *prefix, bool brief_output) { |
| 54 | if (unlikely(!array || !wb)) |
| 55 | return 0; |
| 56 | |
| 57 | if (!prefix) |
| 58 | prefix = "STACKTRACE"; |
| 59 | |
| 60 | size_t reported = 0; |
| 61 | |
| 62 | // Lock the array while we're operating on it |
| 63 | spinlock_lock(&array->spinlock); |
| 64 | |
| 65 | // Update total count if requested |
| 66 | if (total_count) |
| 67 | *total_count = array->num_stacktraces; |
| 68 | |
| 69 | // If brief output is requested, just report the number of stacktraces |
| 70 | if (brief_output) { |
| 71 | buffer_sprintf(wb, "%s: %d stacktraces captured\n", prefix, array->num_stacktraces); |
| 72 | spinlock_unlock(&array->spinlock); |
| 73 | return array->num_stacktraces; |
| 74 | } |
| 75 | |
| 76 | // Report each stacktrace in the array |
| 77 | for (int i = 0; i < array->num_stacktraces; i++) { |
| 78 | if (array->stacktraces[i]) { |
| 79 | if (i > 0) |
| 80 | buffer_strcat(wb, "\n"); |
| 81 | |
| 82 | buffer_sprintf(wb, "%s #%d:\n", prefix, i+1); |
| 83 | stacktrace_to_buffer(array->stacktraces[i], wb); |
| 84 | reported++; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | spinlock_unlock(&array->spinlock); |
| 89 | |
| 90 | return reported; |
| 91 | } |