Trying to grab backtrace. Didn't quite work

ewext/Cargo.lock

@@ -2,6 +2,45 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "addr2line"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e4503c46a5c0c7844e948c9a4d6acd9f50cccb4de1c48eb9e291ea17470c678"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "backtrace"
+version = "0.3.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cc23269a4f8976d0a4d2e7109211a419fe30e8d88d677cd60b6bc79c5732e0a"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
+name = "cc"
+version = "1.1.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b62ac837cdb5cb22e10a256099b4fc502b1dfe560cb282963a974d7abd80e476"
+dependencies = [
+ "shlex",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -12,9 +51,22 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 name = "ewext"
 version = "0.1.0"
 dependencies = [
+ "backtrace",
  "libloading",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.29.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40ecd4077b5ae9fd2e9e169b102c6c330d0605168eb0e8bf79952b256dbefffd"
+
+[[package]]
+name = "libc"
+version = "0.2.158"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8adc4bb1803a324070e64a98ae98f38934d91957a99cfb3a43dcbc01bc56439"
+
 [[package]]
 name = "libloading"
 version = "0.8.5"
@@ -25,6 +77,42 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+
+[[package]]
+name = "miniz_oxide"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8a240ddb74feaf34a79a7add65a741f3167852fba007066dcac1ca548d89c08"
+dependencies = [
+ "adler",
+]
+
+[[package]]
+name = "object"
+version = "0.36.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "084f1a5821ac4c651660a94a7153d27ac9d8a53736203f58b31945ded098070a"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
+
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "windows-targets"
 version = "0.52.6"

ewext/Cargo.toml

@@ -12,3 +12,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 libloading = "0.8.5"
+backtrace = "0.3"

ewext/src/lib.rs

@@ -12,7 +12,36 @@ static LUA: LazyLock<Lua51> = LazyLock::new(|| unsafe {
 // const EWEXT: [(&'static str, Function); 1] = [("testfn", None)];
 
 extern "C" fn test_fn(_lua: *mut lua_State) -> c_int {
-    println!("test fn called");
+    println!("\nStarting trace");
+    backtrace::trace(|frame| {
+        // let ip = frame.ip();
+        let symbol_address = frame.symbol_address();
+
+        print!("symbol: {:#08X}", symbol_address as usize);
+        if let Some(base) = frame.module_base_address() {
+            print!(" base: {:#08X}", base as usize);
+        }
+        // Resolve this instruction pointer to a symbol name
+        backtrace::resolve_frame(frame, |symbol| {
+            if let Some(name) = symbol.name() {
+                print!(" name: {name}");
+            }
+            if let Some(filename) = symbol.filename() {
+                print!(" file: {}", filename.display());
+            }
+        });
+        println!();
+
+        for i in 0..16 {
+            let b: u8 =
+                unsafe { std::ptr::read_volatile((symbol_address as *const u8).wrapping_add(i)) };
+            print!("{:02X} ", b);
+        }
+        println!();
+
+        true // keep going to the next frame
+    });
+    println!("End trace\n");
     0
 }
 
@@ -21,7 +50,7 @@ pub extern "C" fn luaopen_ewext(lua: *mut lua_State) -> c_int {
     println!("Initializing ewext");
     unsafe {
         LUA.lua_pushcclosure(lua, Some(test_fn), 0);
-        LUA.lua_setfield(lua, LUA_GLOBALSINDEX, c"ewext".as_ptr())
+        // LUA.lua_setfield(lua, LUA_GLOBALSINDEX, c"ewext".as_ptr())
     }
     // let mut luastate = unsafe { State::from_ptr(luastateptr) };
     // luastate.new_lib(&EWEXT);

quant.ew/init.lua

@@ -6,7 +6,7 @@ package.path = package.path .. ";./mods/quant.ew/?.lua"
 print(package.cpath)
 
 -- ewext = require("ewext")
--- print(ewext)
+-- ewext()
 
 dofile_once( "data/scripts/lib/utilities.lua" )