From ca89c63adcebe5a8ee118a08042d3458872f3cc3 Mon Sep 17 00:00:00 2001
From: Nilstrieb <48135649+Nilstrieb@users.noreply.github.com>
Date: Tue, 14 Mar 2023 19:47:34 +0100
Subject: [PATCH] unwind

---
 uwuwind/src/api.rs   | 61 ++++++++++++++++++++++++++++++++++++++++++++
 uwuwind/src/lib.rs   |  1 +
 uwuwind/tests/run.rs |  0
 3 files changed, 62 insertions(+)
 create mode 100644 uwuwind/src/api.rs
 create mode 100644 uwuwind/tests/run.rs

diff --git a/uwuwind/src/api.rs b/uwuwind/src/api.rs
new file mode 100644
index 0000000..6966255
--- /dev/null
+++ b/uwuwind/src/api.rs
@@ -0,0 +1,61 @@
+#![allow(nonstandard_style)] // Closely follow the spec here
+
+use std::process::abort;
+
+pub extern "C" fn _UnwindRaiseException(
+    exception_object: *mut _Unwind_Exception,
+) -> _Unwind_Reason_Code {
+    println!("someone raised an exception with addr {exception_object:p}");
+    abort();
+}
+
+#[repr(C)]
+pub enum _Unwind_Reason_Code {
+    _URC_NO_REASON = 0,
+    /// This indicates that a different runtime caught this exception.
+    /// Nested foreign exceptions, or re-throwing a foreign exception, result in
+    /// undefined behavior.
+    _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
+    /// The personality routine encountered an error during phase 1, other than the specific error codes defined.
+    _URC_FATAL_PHASE1_ERROR = 3,
+    /// The personality routine encountered an error during phase 2, for instance a stack corruption.
+    _URC_FATAL_PHASE2_ERROR = 2,
+    _URC_NORMAL_STOP = 4,
+    /// The unwinder encountered the end of the stack during phase 1, without finding a handler.
+    /// The unwind runtime will not have modified the stack.
+    /// The C++ runtime will normally call uncaught_exception() in this case
+    _URC_END_OF_STACK = 5,
+    _URC_HANDLER_FOUND = 6,
+    _URC_INSTALL_CONTEXT = 7,
+    _URC_CONTINUE_UNWIND = 8,
+}
+
+#[repr(C, align(8))]
+pub struct _Unwind_Exception {
+    pub exception_class: u64,
+    pub exception_cleanup0: _Unwind_Exception_Cleanup_Fn,
+    pub private_1: u64,
+    pub private_2: u64,
+}
+
+pub type _Unwind_Exception_Cleanup_Fn =
+    fn(reason: _Unwind_Reason_Code, exc: *const _Unwind_Exception);
+
+/// The _Unwind_Context type is an opaque type used to refer to a system-specific data structure used by the system unwinder.
+/// This context is created and destroyed by the system, and passed to the personality routine during unwinding
+pub struct _Unwind_Context {}
+
+pub type PersonalityRoutine = fn(
+    version: i32,
+    actions: _UnwindAction,
+    exceptionClass: u64,
+    exception_object: *mut _Unwind_Exception,
+    context: *mut _Unwind_Context,
+) -> _Unwind_Reason_Code;
+
+pub type _UnwindAction = i32;
+
+const _UA_SEARCH_PHASE: _UnwindAction = 1;
+const _UA_CLEANUP_PHASE: _UnwindAction = 2;
+const _UA_HANDLER_FRAME: _UnwindAction = 4;
+const _UA_FORCE_UNWIND: _UnwindAction = 8;
diff --git a/uwuwind/src/lib.rs b/uwuwind/src/lib.rs
index e69de29..c78317c 100644
--- a/uwuwind/src/lib.rs
+++ b/uwuwind/src/lib.rs
@@ -0,0 +1 @@
+pub mod api;
\ No newline at end of file
diff --git a/uwuwind/tests/run.rs b/uwuwind/tests/run.rs
new file mode 100644
index 0000000..e69de29