| swissChili | 6d02af4 | 2021-08-05 19:49:01 -0700 | [diff] [blame] | 1 | #pragma once |
| 2 | |
| 3 | #include <stdbool.h> |
| 4 | |
| 5 | // Error handling code |
| 6 | |
| 7 | struct eloc |
| 8 | { |
| 9 | int line; |
| 10 | char *file; |
| 11 | }; |
| 12 | |
| 13 | enum error_code |
| 14 | { |
| 15 | EOK = 0, |
| 16 | /// Expected something but didn't get it. if this is in a |
| 17 | /// safe_state we should probably just re-try. |
| 18 | EEXPECTED, |
| 19 | /// An invalid token was present in the input |
| 20 | EINVALID, |
| 21 | /// A structure was malformed |
| 22 | EMALFORMED, |
| 23 | /// The arguments provided were invalid |
| 24 | EARGS, |
| 25 | /// An external resource (say, a file) was not found |
| 26 | ENOTFOUND, |
| 27 | /// This is unimplemented |
| 28 | EUNIMPL, |
| 29 | }; |
| 30 | |
| 31 | struct error |
| 32 | { |
| 33 | enum error_code code; |
| 34 | // Is any state safe? I.e. can we continue or must we panic? |
| 35 | bool safe_state; |
| 36 | struct eloc loc; |
| 37 | char *message; |
| 38 | }; |
| 39 | |
| 40 | #define E_INIT() \ |
| 41 | struct error __error; \ |
| 42 | __error.code = EOK; \ |
| 43 | __error.loc.line = 0; \ |
| 44 | __error.safe_state = false; \ |
| 45 | __error.message = NULL; \ |
| 46 | __error.loc.file = NULL; |
| 47 | #define NEARVAL(val) \ |
| 48 | __error.loc.line = cons_line(val); \ |
| 49 | __error.loc.file = cons_file(val) |
| 50 | #define NEARIS(is) (is)->getpos((is), &__error.loc.line, &__error.loc.file) |
| 51 | #define _TRY(expr, m, c) \ |
| 52 | { \ |
| 53 | struct error __sub = (expr); \ |
| 54 | if (__sub.code) \ |
| 55 | { \ |
| 56 | if (!__sub.loc.file || !__sub.loc.line) \ |
| 57 | __sub.loc.file = __error.loc.file, \ |
| 58 | __sub.loc.line = __error.loc.line; \ |
| 59 | if (c) \ |
| 60 | __sub.code = c; \ |
| 61 | if (m) \ |
| 62 | __sub.message = m; \ |
| 63 | return __sub; \ |
| 64 | } \ |
| 65 | } |
| 66 | #define TRY(expr) _TRY(expr, NULL, 0) |
| 67 | #define TRY_ELSE(expr, c, ...) _TRY(expr, ehsprintf(__VA_ARGS__), c) |
| 68 | #define OKAY() return __error |
| 69 | #define THROW(_c, ...) \ |
| 70 | { \ |
| 71 | __error.code = (_c); \ |
| 72 | __error.message = ehsprintf(__VA_ARGS__); \ |
| 73 | return __error; \ |
| 74 | } |
| 75 | #define THROWSAFE(_c) \ |
| 76 | { \ |
| 77 | __error.code = (_c); \ |
| 78 | __error.safe_state = true; \ |
| 79 | return __error; \ |
| 80 | } |
| 81 | |
| 82 | #define IS_OKAY(e) ((e).code == EOK) |
| 83 | #define OKAY_IF(val) \ |
| 84 | { \ |
| 85 | struct error __sub = (val); \ |
| 86 | if (IS_OKAY(__sub)) \ |
| 87 | OKAY(); \ |
| 88 | if (!__sub.safe_state) \ |
| 89 | TRY(__sub) \ |
| 90 | } |
| 91 | |
| 92 | #define WARN_UNUSED __attribute__((warn_unused_result)) |
| 93 | |
| 94 | // error heap string print formatted |
| 95 | // returns a heap-allocated string. |
| 96 | char *ehsprintf(const char *msg, ...); |
| 97 | |
| 98 | void ereport(struct error err); |