From 5e44fe77ec35c251614839781823fffa385e562a Mon Sep 17 00:00:00 2001
From: theMackabu <theMackabu@gmail.com>
Date: Mon, 27 Apr 2026 23:30:11 -0700
Subject: [PATCH] musl libunwind

---
 meson/deps/meson.build | 11 ++++++++++-
 src/crash.c            | 35 ++++++++++++++++++++++++++++++++++-
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/meson/deps/meson.build b/meson/deps/meson.build
index 0bb42db..6e80960 100644
--- a/meson/deps/meson.build
+++ b/meson/deps/meson.build
@@ -51,6 +51,15 @@ else
   win_deps = []
 endif
 
+crash_deps = []
+if host_machine.system() == 'linux'
+  libunwind_dep = dependency('libunwind', required: false, static: is_static)
+  if libunwind_dep.found() and cc.has_header('libunwind.h', dependencies: libunwind_dep)
+    crash_deps += [libunwind_dep]
+    add_project_arguments('-DANT_CRASH_HAVE_LIBUNWIND', language: 'c')
+  endif
+endif
+
 deps_info = {
   'lmdb': {
     'dir': 'openldap-LMDB_0.9.33',
@@ -234,7 +243,7 @@ ant_deps = [
   uriparser_dep, utf8proc_dep, ssl_dep, crypto_dep,
   zlib_dep, brotli_common_dep, brotli_dec_dep,
   brotli_enc_dep, uthash_dep, lmdb_dep, wamr_dep,
-] + win_deps
+] + win_deps + crash_deps
 
 if get_option('jit')
   mir_dep = subproject('mir').get_variable('mir_dep')
diff --git a/src/crash.c b/src/crash.c
index 23dee06..4c4af4b 100644
--- a/src/crash.c
+++ b/src/crash.c
@@ -67,10 +67,15 @@ bool ant_crash_is_internal_report(int argc, char **argv) {
 #include <sys/utsname.h>
 #endif
 
-#if defined(__APPLE__) || defined(__linux__) || defined(__GLIBC__)
+#if defined(__APPLE__) || defined(__GLIBC__)
 #define ANT_CRASH_HAVE_EXECINFO 1
 #include <execinfo.h>
 #endif
+
+#ifdef ANT_CRASH_HAVE_LIBUNWIND
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#endif
 #endif
 
 typedef struct {
@@ -965,6 +970,34 @@ static void crash_handler(int sig, siginfo_t *info, void *ucontext) {
   int skip = n > 1 ? 1 : 0;
   for (int i = skip; i < n && frame_count < ANT_CRASH_FRAME_MAX; i++)
     frames[frame_count++] = (uintptr_t)raw_frames[i];
+#elif defined(ANT_CRASH_HAVE_LIBUNWIND)
+  unw_cursor_t cursor;
+  bool cursor_ready = false;
+  bool include_current_frame = false;
+
+#ifdef UNW_INIT_SIGNAL_FRAME
+  if (ucontext && unw_init_local2(&cursor, (unw_context_t *)ucontext, UNW_INIT_SIGNAL_FRAME) == 0) {
+    cursor_ready = true;
+    include_current_frame = true;
+  }
+#endif
+
+  unw_context_t context;
+  if (!cursor_ready && unw_getcontext(&context) == 0 && unw_init_local(&cursor, &context) == 0)
+    cursor_ready = true;
+
+  if (cursor_ready) {
+    if (include_current_frame) {
+      unw_word_t ip = 0;
+      if (unw_get_reg(&cursor, UNW_REG_IP, &ip) == 0 && ip)
+        frames[frame_count++] = (uintptr_t)ip;
+    }
+    while (frame_count < ANT_CRASH_FRAME_MAX && unw_step(&cursor) > 0) {
+      unw_word_t ip = 0;
+      if (unw_get_reg(&cursor, UNW_REG_IP, &ip) == 0 && ip)
+        frames[frame_count++] = (uintptr_t)ip;
+    }
+  }
 #endif
 
   uint64_t fault_addr = info ? (uint64_t)(uintptr_t)info->si_addr : 0;
-- 
2.51.2