feat: enable emscripten debugging

MODULE.bazel

@@ -10,7 +10,7 @@ bazel_dep(name = "ecsact_runtime", version = "0.7.0")
 bazel_dep(name = "rules_ecsact", version = "0.5.8")
 bazel_dep(name = "docopt.cpp", version = "0.6.2")
 bazel_dep(name = "magic_enum", version = "0.9.3")
-bazel_dep(name = "rules_wasmer", version = "0.1.1")
+bazel_dep(name = "rules_wasmer", version = "0.1.2")
 bazel_dep(name = "ecsact_cli", version = "0.3.19")
 bazel_dep(name = "platforms", version = "0.0.10")
 

ecsact/wasm/detail/emscripten_debug.cc

@@ -0,0 +1,16 @@
+#include "ecsact/wasm/detail/emscripten_debug.hh"
+#include <stdexcept>
+
+auto ecsact::wasm::detail::emscripten_debug_segfault(
+	const wasm_val_vec_t* args,
+	wasm_val_vec_t*       results
+) -> wasm_trap_t* {
+	throw std::logic_error{"segfault"};
+}
+
+auto ecsact::wasm::detail::emscripten_debug_alignfault(
+	const wasm_val_vec_t* args,
+	wasm_val_vec_t*       results
+) -> wasm_trap_t* {
+	throw std::logic_error{"alignfault"};
+}

ecsact/wasm/detail/emscripten_debug.hh

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <wasm.h>
+
+namespace ecsact::wasm::detail {
+auto emscripten_debug_segfault(
+	const wasm_val_vec_t* args,
+	wasm_val_vec_t*       results
+) -> wasm_trap_t*;
+
+auto emscripten_debug_alignfault(
+	const wasm_val_vec_t* args,
+	wasm_val_vec_t*       results
+) -> wasm_trap_t*;
+} // namespace ecsact::wasm::detail

ecsact/wasm/detail/guest_imports/emscripten_debug.hh

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "ecsact/wasm/detail/guest_imports.hh"
+#include "ecsact/wasm/detail/util.hh"
+#include "ecsact/wasm/detail/emscripten_debug.hh"
+
+namespace ecsact::wasm::detail {
+
+const auto guest_emscripten_debug_module_imports = allowed_guest_imports_t{
+	{
+		"segfault",
+		[]() -> minst_import_resolve_func {
+			return {
+				wasm_functype_new_0_0(),
+				&emscripten_debug_segfault,
+			};
+		},
+	},
+	{
+		"alignfault",
+		[]() -> minst_import_resolve_func {
+			return {
+				wasm_functype_new_0_0(),
+				&emscripten_debug_alignfault,
+			};
+		},
+	}
+};
+
+} // namespace ecsact::wasm::detail

ecsact/wasm/detail/minst/minst.cc

@@ -262,6 +262,15 @@ auto minst::exports() -> std::span<minst_export> {
 }
 
 auto minst::initialize() -> std::optional<minst_trap> {
+	for(auto exp : exports()) {
+		if(exp.name() == "emscripten_stack_init") {
+			auto trap = exp.func_call();
+			if(trap) {
+				return trap;
+			}
+			break;
+		}
+	}
 	for(auto exp : exports()) {
 		if(exp.name() == "_initialize") {
 			return exp.func_call();

ecsact/wasm/detail/wasm.cc

@@ -25,6 +25,7 @@
 #include "ecsact/wasm/detail/logger.hh"
 #include "ecsact/wasm/detail/wasi_fs.hh"
 #include "ecsact/wasm/detail/globals.hh"
+#include "ecsact/wasm/detail/guest_imports/emscripten_debug.hh"
 #include "ecsact/wasm/detail/guest_imports/wasi_snapshot_preview1.hh"
 #include "ecsact/wasm/detail/guest_imports/env.hh"
 #include "ecsact/wasm/detail/cpp_util.hh"
@@ -164,6 +165,7 @@ ecsactsi_wasm_error ecsactsi_wasm_load(
 	const char**           wasm_exports
 ) {
 	using ecsact::wasm::detail::engine;
+	using ecsact::wasm::detail::guest_emscripten_debug_module_imports;
 	using ecsact::wasm::detail::minst;
 	using ecsact::wasm::detail::minst_error_code;
 	using ecsact::wasm::detail::minst_export;
@@ -180,6 +182,11 @@ ecsactsi_wasm_error ecsactsi_wasm_load(
 		if(imp.module() == "env") {
 			auto itr = guest_env_module_imports.find(method_name);
 			if(itr == guest_env_module_imports.end()) {
+				auto debug_itr =
+					guest_emscripten_debug_module_imports.find(method_name);
+				if(debug_itr != guest_emscripten_debug_module_imports.end()) {
+					return debug_itr->second();
+				}
 				return std::nullopt;
 			}
 			return itr->second();

test/MODULE.bazel

@@ -2,7 +2,7 @@ module(name = "ecsact_si_wasm_test")
 
 bazel_dep(name = "rules_cc", version = "0.0.9")
 bazel_dep(name = "ecsact_runtime", version = "0.7.0")
-bazel_dep(name = "rules_wasmer", version = "0.1.1")
+bazel_dep(name = "rules_wasmer", version = "0.1.2")
 bazel_dep(name = "ecsact_rt_entt", version = "0.3.8")
 bazel_dep(name = "ecsact_lang_cpp", version = "0.4.9")
 bazel_dep(name = "ecsact_parse", version = "0.5.4")