1 files changed, 31 insertions, 0 deletions
diff --git a/lib/std/special/panic.zig b/lib/std/special/panic.zig
new file mode 100644
index 0000000000..f42085126b
--- /dev/null
+++ b/lib/std/special/panic.zig
@@ -0,0 +1,31 @@
+// This file is the default panic handler if the root source file does not
+// have a `pub fn panic`.
+// If this file wants to import other files *by name*, support for that would
+// have to be added in the compiler.
+
+const builtin = @import("builtin");
+const std = @import("std");
+
+pub fn panic(msg: []const u8, error_return_trace: ?*builtin.StackTrace) noreturn {
+    @setCold(true);
+    switch (builtin.os) {
+        .freestanding => {
+            while (true) {
+                @breakpoint();
+            }
+        },
+        .wasi => {
+            std.debug.warn("{}", msg);
+            _ = std.os.wasi.proc_raise(std.os.wasi.SIGABRT);
+            unreachable;
+        },
+        .uefi => {
+            // TODO look into using the debug info and logging helpful messages
+            std.os.abort();
+        },
+        else => {
+            const first_trace_addr = @returnAddress();
+            std.debug.panicExtra(error_return_trace, first_trace_addr, "{}", msg);
+        },
+    }
+}