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export fn and finch build --shared: libraries a C program loads (game scripts)

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export fn name(...) is a C function by that name (numbers, bool, char, pointers in and out).
--shared builds lib<name>.so / <name>.dll with no main. finch_module_on_fatal(handler) lets the
host take runtime errors over (longjmp out) instead of the process exiting.
tests/shared.sh: a C host loads one, calls it and survives an index error.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Nexoniarz 2026-10-11 02:14:09 +02:00
commit 68637a35a7
16 changed files with 148 additions and 10 deletions
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21
runtime/finch_rt.c
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@ -37,12 +37,26 @@ static char empty[1] = "";
// ---------- runtime errors ----------
__attribute__((noreturn, cold)) void finch_panic(const char *file, int64_t line, const char *msg) {
// A program that loads Finch libraries (finch build --shared) can take runtime errors over
// instead of the process exiting: finch_module_on_fatal(handler) in each library. The handler
// gets the message and must not return (longjmp out, or exit itself).
static void (*fatal_hook)(const char *msg);
void finch_on_fatal(void (*hook)(const char *msg)) { fatal_hook = hook; }
static __attribute__((noreturn)) void fatal(const char *msg) {
if (fatal_hook) fatal_hook(msg);
fflush(stdout);
fprintf(stderr, "%s:%lld: runtime error: %s\n", file, (long long)line, msg);
fprintf(stderr, "%s\n", msg);
exit(1);
}
__attribute__((noreturn, cold)) void finch_panic(const char *file, int64_t line, const char *msg) {
char full[1024];
snprintf(full, sizeof full, "%s:%lld: runtime error: %s", file, (long long)line, msg);
fflush(stdout);
fatal(full);
}
__attribute__((noreturn, cold)) void finch_panic_index(const char *file, int64_t line, int64_t i, int64_t len) {
char msg[128];
snprintf(msg, sizeof msg, "index %lld is out of range (the length is %lld)", (long long)i, (long long)len);
@ -52,8 +66,7 @@ __attribute__((noreturn, cold)) void finch_panic_index(const char *file, int64_t
static void *must(void *p) {
if (!p) {
fflush(stdout);
fprintf(stderr, "runtime error: out of memory\n");
exit(1);
fatal("runtime error: out of memory");
}
return p;
}