add roc_panic to all hosts

cli/tests/fixtures/multi-dep-str/platform/host.zig

@@ -40,6 +40,13 @@ export fn roc_dealloc(c_ptr: *c_void, alignment: u32) callconv(.C) void {
     free(@alignCast(16, @ptrCast([*]u8, c_ptr)));
 }
 
+export fn roc_panic(c_ptr: *c_void, tag_id: u32) callconv(.C) void {
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
 const RocCallResult = extern struct { flag: usize, content: RocStr };
 
 const Unit = extern struct {};

cli/tests/fixtures/multi-dep-thunk/platform/host.zig

@@ -40,6 +40,13 @@ export fn roc_dealloc(c_ptr: *c_void, alignment: u32) callconv(.C) void {
     free(@alignCast(16, @ptrCast([*]u8, c_ptr)));
 }
 
+export fn roc_panic(c_ptr: *c_void, tag_id: u32) callconv(.C) void {
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
 const RocCallResult = extern struct { flag: usize, content: RocStr };
 
 const Unit = extern struct {};

compiler/build/src/program.rs

@@ -149,7 +149,7 @@ pub fn gen_from_mono_module(
     };
 
     // TODO remove for debug only
-    roc_gen_llvm::llvm::externs::add_sjlj_roc_panic(&env);
+    // roc_gen_llvm::llvm::externs::add_sjlj_roc_panic(&env);
 
     roc_gen_llvm::llvm::build::build_procedures(
         &env,

examples/benchmarks/platform/host.zig

@@ -45,6 +45,13 @@ export fn roc_dealloc(c_ptr: *c_void, alignment: u32) callconv(.C) void {
     free(@alignCast(16, @ptrCast([*]u8, c_ptr)));
 }
 
+export fn roc_panic(c_ptr: *c_void, tag_id: u32) callconv(.C) void {
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
 const Unit = extern struct {};
 
 pub export fn main() u8 {

examples/effect/thing/platform-dir/host.zig

@@ -45,6 +45,13 @@ export fn roc_dealloc(c_ptr: *c_void, alignment: u32) callconv(.C) void {
     free(@alignCast(16, @ptrCast([*]u8, c_ptr)));
 }
 
+export fn roc_panic(c_ptr: *c_void, tag_id: u32) callconv(.C) void {
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
 const Unit = extern struct {};
 
 pub export fn main() u8 {

examples/hello-rust/platform/src/lib.rs

@@ -31,18 +31,18 @@ pub unsafe fn roc_dealloc(c_ptr: *mut c_void, _alignment: u32) {
     return libc::free(c_ptr);
 }
 
-// #[no_mangle]
+#[no_mangle]
-// pub unsafe fn roc_panic(c_ptr: *mut c_void, tag_id: u32) {
+pub unsafe fn roc_panic(c_ptr: *mut c_void, tag_id: u32) {
-//     match tag_id {
+    match tag_id {
-//         0 => {
+        0 => {
-//             let slice = CStr::from_ptr(c_ptr as *const c_char);
+            let slice = CStr::from_ptr(c_ptr as *const c_char);
-//             let string = slice.to_str().unwrap();
+            let string = slice.to_str().unwrap();
-//             eprintln!("Roc hit a panic: {}", string);
+            eprintln!("Roc hit a panic: {}", string);
-//             std::process::exit(1);
+            std::process::exit(1);
-//         }
+        }
-//         _ => todo!(),
+        _ => todo!(),
-//     }
+    }
-// }
+}
 
 #[no_mangle]
 pub fn rust_main() -> isize {

examples/hello-world/platform/host.c

@@ -17,6 +17,12 @@ void roc_dealloc(void* ptr, unsigned int alignment) {
     free(ptr);
 }
 
+void roc_panic(void* ptr, unsigned int alignment) {
+    char* msg = (char *)ptr; 
+    fprintf(stderr, "Application crashed with message\n\n    %s\n\nShutting down\n", msg);
+    exit(0);
+}
+
 struct RocStr {
     char* bytes;
     size_t len;

examples/hello-zig/platform/host.zig

@@ -35,6 +35,13 @@ export fn roc_dealloc(c_ptr: *c_void, alignment: u32) callconv(.C) void {
     free(@alignCast(16, @ptrCast([*]u8, c_ptr)));
 }
 
+export fn roc_panic(c_ptr: *c_void, tag_id: u32) callconv(.C) void {
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
 const mem = std.mem;
 const Allocator = mem.Allocator;
 

examples/quicksort/platform/host.zig

@@ -38,6 +38,13 @@ export fn roc_dealloc(c_ptr: *c_void, alignment: u32) callconv(.C) void {
     free(@alignCast(16, @ptrCast([*]u8, c_ptr)));
 }
 
+export fn roc_panic(c_ptr: *c_void, tag_id: u32) callconv(.C) void {
+    const stderr = std.io.getStdErr().writer();
+    const msg = @ptrCast([*:0]const u8, c_ptr);
+    stderr.print("Application crashed with message\n\n    {s}\n\nShutting down\n", .{msg}) catch unreachable;
+    std.process.exit(0);
+}
+
 // warning! the array is currently stack-allocated so don't make this too big
 const NUM_NUMS = 100;