wip

bench/napi/create-double/.gitignore

@@ -0,0 +1,34 @@
+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store

bench/napi/create-double/README.md

@@ -0,0 +1,15 @@
+# napi
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.2.8. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

bench/napi/create-double/binding.gyp

@@ -0,0 +1,9 @@
+{
+  "targets": [
+    {
+      "target_name": "create-double",
+      "sources": [ "main.c" ],
+      "include_dirs": [ "." ]
+    }
+  ]
+}

bench/napi/create-double/bun.lock

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+
+    "proc-log": ["proc-log@5.0.0", "", {}, "sha512-Azwzvl90HaF0aCz1JrDdXQykFakSSNPaPoiZ9fm5qJIMHioDZEi7OAdRwSm6rSoPtY3Qutnm3L7ogmg3dc+wbQ=="],
+
+    "promise-retry": ["promise-retry@2.0.1", "", { "dependencies": { "err-code": "^2.0.2", "retry": "^0.12.0" } }, "sha512-y+WKFlBR8BGXnsNlIHFGPZmyDf3DFMoLhaflAnyZgV6rG6xu+JwesTo2Q9R6XwYmtmwAFCkAk3e35jEdoeh/3g=="],
+
+    "retry": ["retry@0.12.0", "", {}, "sha512-9LkiTwjUh6rT555DtE9rTX+BKByPfrMzEAtnlEtdEwr3Nkffwiihqe2bWADg+OQRjt9gl6ICdmB/ZFDCGAtSow=="],
+
+    "safer-buffer": ["safer-buffer@2.1.2", "", {}, "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="],
+
+    "semver": ["semver@7.7.1", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-hlq8tAfn0m/61p4BVRcPzIGr6LKiMwo4VM6dGi6pt4qcRkmNzTcWq6eCEjEh+qXjkMDvPlOFFSGwQjoEa6gyMA=="],
+
+    "shebang-command": ["shebang-command@2.0.0", "", { "dependencies": { "shebang-regex": "^3.0.0" } }, "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA=="],
+
+    "shebang-regex": ["shebang-regex@3.0.0", "", {}, "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A=="],
+
+    "signal-exit": ["signal-exit@4.1.0", "", {}, "sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw=="],
+
+    "smart-buffer": ["smart-buffer@4.2.0", "", {}, "sha512-94hK0Hh8rPqQl2xXc3HsaBoOXKV20MToPkcXvwbISWLEs+64sBq5kFgn2kJDHb1Pry9yrP0dxrCI9RRci7RXKg=="],
+
+    "socks": ["socks@2.8.4", "", { "dependencies": { "ip-address": "^9.0.5", "smart-buffer": "^4.2.0" } }, "sha512-D3YaD0aRxR3mEcqnidIs7ReYJFVzWdd6fXJYUM8ixcQcJRGTka/b3saV0KflYhyVJXKhb947GndU35SxYNResQ=="],
+
+    "socks-proxy-agent": ["socks-proxy-agent@8.0.5", "", { "dependencies": { "agent-base": "^7.1.2", "debug": "^4.3.4", "socks": "^2.8.3" } }, "sha512-HehCEsotFqbPW9sJ8WVYB6UbmIMv7kUUORIF2Nncq4VQvBfNBLibW9YZR5dlYCSUhwcD628pRllm7n+E+YTzJw=="],
+
+    "sprintf-js": ["sprintf-js@1.1.3", "", {}, "sha512-Oo+0REFV59/rz3gfJNKQiBlwfHaSESl1pcGyABQsnnIfWOFt6JNj5gCog2U6MLZ//IGYD+nA8nI+mTShREReaA=="],
+
+    "ssri": ["ssri@12.0.0", "", { "dependencies": { "minipass": "^7.0.3" } }, "sha512-S7iGNosepx9RadX82oimUkvr0Ct7IjJbEbs4mJcTxst8um95J3sDYU1RBEOvdu6oL1Wek2ODI5i4MAw+dZ6cAQ=="],
+
+    "string-width": ["string-width@5.1.2", "", { "dependencies": { "eastasianwidth": "^0.2.0", "emoji-regex": "^9.2.2", "strip-ansi": "^7.0.1" } }, "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA=="],
+
+    "string-width-cjs": ["string-width@4.2.3", "", { "dependencies": { "emoji-regex": "^8.0.0", "is-fullwidth-code-point": "^3.0.0", "strip-ansi": "^6.0.1" } }, "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g=="],
+
+    "strip-ansi": ["strip-ansi@7.1.0", "", { "dependencies": { "ansi-regex": "^6.0.1" } }, "sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ=="],
+
+    "strip-ansi-cjs": ["strip-ansi@6.0.1", "", { "dependencies": { "ansi-regex": "^5.0.1" } }, "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A=="],
+
+    "tar": ["tar@7.4.3", "", { "dependencies": { "@isaacs/fs-minipass": "^4.0.0", "chownr": "^3.0.0", "minipass": "^7.1.2", "minizlib": "^3.0.1", "mkdirp": "^3.0.1", "yallist": "^5.0.0" } }, "sha512-5S7Va8hKfV7W5U6g3aYxXmlPoZVAwUMy9AOKyF2fVuZa2UD3qZjg578OrLRt8PcNN1PleVaL/5/yYATNL0ICUw=="],
+
+    "tinyglobby": ["tinyglobby@0.2.12", "", { "dependencies": { "fdir": "^6.4.3", "picomatch": "^4.0.2" } }, "sha512-qkf4trmKSIiMTs/E63cxH+ojC2unam7rJ0WrauAzpT3ECNTxGRMlaXxVbfxMUC/w0LaYk6jQ4y/nGR9uBO3tww=="],
+
+    "typescript": ["typescript@5.8.2", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-aJn6wq13/afZp/jT9QZmwEjDqqvSGp1VT5GVg+f/t6/oVyrgXM6BY1h9BRh/O5p3PlUPAe+WuiEZOmb/49RqoQ=="],
+
+    "undici-types": ["undici-types@6.21.0", "", {}, "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ=="],
+
+    "unique-filename": ["unique-filename@4.0.0", "", { "dependencies": { "unique-slug": "^5.0.0" } }, "sha512-XSnEewXmQ+veP7xX2dS5Q4yZAvO40cBN2MWkJ7D/6sW4Dg6wYBNwM1Vrnz1FhH5AdeLIlUXRI9e28z1YZi71NQ=="],
+
+    "unique-slug": ["unique-slug@5.0.0", "", { "dependencies": { "imurmurhash": "^0.1.4" } }, "sha512-9OdaqO5kwqR+1kVgHAhsp5vPNU0hnxRa26rBFNfNgM7M6pNtgzeBn3s/xbyCQL3dcjzOatcef6UUHpB/6MaETg=="],
+
+    "which": ["which@5.0.0", "", { "dependencies": { "isexe": "^3.1.1" }, "bin": { "node-which": "bin/which.js" } }, "sha512-JEdGzHwwkrbWoGOlIHqQ5gtprKGOenpDHpxE9zVR1bWbOtYRyPPHMe9FaP6x61CmNaTThSkb0DAJte5jD+DmzQ=="],
+
+    "wrap-ansi": ["wrap-ansi@8.1.0", "", { "dependencies": { "ansi-styles": "^6.1.0", "string-width": "^5.0.1", "strip-ansi": "^7.0.1" } }, "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ=="],
+
+    "wrap-ansi-cjs": ["wrap-ansi@7.0.0", "", { "dependencies": { "ansi-styles": "^4.0.0", "string-width": "^4.1.0", "strip-ansi": "^6.0.0" } }, "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q=="],
+
+    "yallist": ["yallist@5.0.0", "", {}, "sha512-YgvUTfwqyc7UXVMrB+SImsVYSmTS8X/tSrtdNZMImM+n7+QTriRXyXim0mBrTXNeqzVF0KWGgHPeiyViFFrNDw=="],
+
+    "cross-spawn/which": ["which@2.0.2", "", { "dependencies": { "isexe": "^2.0.0" }, "bin": { "node-which": "./bin/node-which" } }, "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA=="],
+
+    "minipass-flush/minipass": ["minipass@3.3.6", "", { "dependencies": { "yallist": "^4.0.0" } }, "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw=="],
+
+    "minipass-pipeline/minipass": ["minipass@3.3.6", "", { "dependencies": { "yallist": "^4.0.0" } }, "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw=="],
+
+    "minipass-sized/minipass": ["minipass@3.3.6", "", { "dependencies": { "yallist": "^4.0.0" } }, "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw=="],
+
+    "string-width-cjs/emoji-regex": ["emoji-regex@8.0.0", "", {}, "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A=="],
+
+    "string-width-cjs/strip-ansi": ["strip-ansi@6.0.1", "", { "dependencies": { "ansi-regex": "^5.0.1" } }, "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A=="],
+
+    "strip-ansi-cjs/ansi-regex": ["ansi-regex@5.0.1", "", {}, "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="],
+
+    "wrap-ansi-cjs/ansi-styles": ["ansi-styles@4.3.0", "", { "dependencies": { "color-convert": "^2.0.1" } }, "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg=="],
+
+    "wrap-ansi-cjs/string-width": ["string-width@4.2.3", "", { "dependencies": { "emoji-regex": "^8.0.0", "is-fullwidth-code-point": "^3.0.0", "strip-ansi": "^6.0.1" } }, "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g=="],
+
+    "wrap-ansi-cjs/strip-ansi": ["strip-ansi@6.0.1", "", { "dependencies": { "ansi-regex": "^5.0.1" } }, "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A=="],
+
+    "cross-spawn/which/isexe": ["isexe@2.0.0", "", {}, "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw=="],
+
+    "minipass-flush/minipass/yallist": ["yallist@4.0.0", "", {}, "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="],
+
+    "minipass-pipeline/minipass/yallist": ["yallist@4.0.0", "", {}, "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="],
+
+    "minipass-sized/minipass/yallist": ["yallist@4.0.0", "", {}, "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="],
+
+    "string-width-cjs/strip-ansi/ansi-regex": ["ansi-regex@5.0.1", "", {}, "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="],
+
+    "wrap-ansi-cjs/string-width/emoji-regex": ["emoji-regex@8.0.0", "", {}, "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A=="],
+
+    "wrap-ansi-cjs/strip-ansi/ansi-regex": ["ansi-regex@5.0.1", "", {}, "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="],
+  }
+}

bench/napi/create-double/index.ts

@@ -0,0 +1,9 @@
+import { bench, group, run } from "../../runner.mjs";
+const napi_module = require("./build/Release/create-double.node");
+
+let sum = 0.0;
+for (let i = 0; i < 100_000_000; i++) {
+  sum += napi_module.nativeFunc();
+}
+
+console.log("Result", sum);

bench/napi/create-double/main.c

@@ -0,0 +1,46 @@
+
+// GENERATED CODE ... NO TOUCHY!!
+#include <node_api.h>
+
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <uv.h>
+
+napi_value native_func(napi_env env, napi_callback_info info) {
+  napi_value result;
+  double number = 0.1;
+
+  napi_status status = napi_create_double(env, number, &result);
+  if (status != napi_ok) {
+    napi_throw_error(env, NULL, "Failed to create double!");
+    return NULL;
+  }
+
+  return result;
+}
+
+napi_value Init(napi_env env, napi_value exports) {
+  napi_status status;
+  napi_value fn_call_uv_func;
+
+  // Register call_uv_func function
+  status =
+      napi_create_function(env, NULL, 0, native_func, NULL, &fn_call_uv_func);
+  if (status != napi_ok) {
+    napi_throw_error(env, NULL, "Failed to create native_func function");
+    return NULL;
+  }
+
+  status = napi_set_named_property(env, exports, "nativeFunc", fn_call_uv_func);
+  if (status != napi_ok) {
+    napi_throw_error(env, NULL,
+                     "Failed to add native_func function to exports");
+    return NULL;
+  }
+
+  return exports;
+}
+
+NAPI_MODULE(NODE_GYP_MODULE_NAME, Init)

bench/napi/create-double/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "create-double",
+  "module": "index.ts",
+  "type": "module",
+  "private": true,
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "node-gyp": "^11.2.0"
+  },
+  "scripts": {
+    "build": "node-gyp configure && node-gyp build"
+  }
+}

bench/napi/create-double/tsconfig.json

@@ -0,0 +1,28 @@
+{
+  "compilerOptions": {
+    // Environment setup & latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}

cmake/targets/BuildBun.cmake

@@ -824,6 +824,8 @@ if(WIN32)
 endif()
 
 target_compile_definitions(${bun} PRIVATE
+  # This is needed for dladdr in dlfcn.h, all libc's add it if you do #define _GNU_SOURCE
+  _GNU_SOURCE
   _HAS_EXCEPTIONS=0
   LIBUS_USE_OPENSSL=1
   LIBUS_USE_BORINGSSL=1

src/bun.js/bindings/BunProcess.cpp

@@ -363,7 +363,27 @@ static char* toFileURI(std::span<const char> span)
 
 extern "C" size_t Bun__process_dlopen_count;
 
-extern "C" void CrashHandler__setDlOpenAction(const char* action);
+extern "C" void CrashHandler__setNapiAction(const char* action);
+
+/**
+ * RAII wrapper for CrashHandler__setDlOpenAction
+ * Sets the dlopen action on construction and clears it on destruction
+ */
+class DlOpenActionGuard {
+public:
+    explicit DlOpenActionGuard(const char* action)
+    {
+        CrashHandler__setNapiAction(action);
+    }
+
+    ~DlOpenActionGuard()
+    {
+        CrashHandler__setNapiAction(nullptr);
+    }
+
+    WTF_MAKE_NONCOPYABLE(DlOpenActionGuard);
+    WTF_MAKE_NONMOVABLE(DlOpenActionGuard);
+};
 
 JSC_DEFINE_HOST_FUNCTION(Process_functionDlopen, (JSC::JSGlobalObject * globalObject_, JSC::CallFrame* callFrame))
 {
@@ -440,9 +460,8 @@ JSC_DEFINE_HOST_FUNCTION(Process_functionDlopen, (JSC::JSGlobalObject * globalOb
     HMODULE handle = Bun__LoadLibraryBunString(&filename_str);
 #else
     CString utf8 = filename.utf8();
-    CrashHandler__setDlOpenAction(utf8.data());
+    DlOpenActionGuard guard(utf8.data());
     void* handle = dlopen(utf8.data(), RTLD_LAZY);
-    CrashHandler__setDlOpenAction(nullptr);
 #endif
 
     globalObject->m_pendingNapiModuleDlopenHandle = handle;

src/bun.js/bindings/ZigGlobalObject.cpp

@@ -1151,6 +1151,15 @@ String GlobalObject::agentClusterID() const
 
 namespace Zig {
 
+extern "C" void* Bun__getCurrentNapiFunctionFromGlobalObject(JSC::JSGlobalObject* lexicalGlobalObject)
+{
+    auto* globalObject = jsDynamicCast<Zig::GlobalObject*>(lexicalGlobalObject);
+    if (!globalObject) {
+        return nullptr;
+    }
+    return globalObject->m_currentNapiFunction;
+}
+
 using namespace WebCore;
 
 static JSGlobalObject* deriveShadowRealmGlobalObject(JSGlobalObject* globalObject)

src/bun.js/bindings/ZigGlobalObject.h

@@ -431,6 +431,16 @@ public:
     // We will add it to the resulting napi value.
     void* m_pendingNapiModuleDlopenHandle = nullptr;
 
+    /// Used for libuv stubs to give a helpful error message of the napi module that called an unsupported libuv function.
+    ///
+    /// We set this everytime a NAPI native function is called (ones that are created using `napi_create_function`)
+    ///
+    /// The value is the function pointer of the native function
+    ///
+    /// If an unsupported UV function is called somewhere down the callstack during the execution of the native function,
+    /// we use `dladdr(current_napi_function, &info)` to get the path of the NAPI module the native function belongs to.
+    void* m_currentNapiFunction = nullptr;
+
     // The handle scope where all new NAPI values will be created. You must not pass any napi_values
     // back to a NAPI function without putting them in the handle scope, as the NAPI function may
     // move them off the stack which will cause them to get collected if not in the handle scope.
@@ -708,6 +718,7 @@ using JSDOMGlobalObject = Zig::GlobalObject;
 
 // Do not use this directly.
 namespace ___private___ {
+extern "C" void* Bun__getCurrentNapiFunctionFromGlobalObject(JSC::JSGlobalObject* lexicalGlobalObject);
 extern "C" Zig::GlobalObject* Bun__getDefaultGlobalObject();
 inline Zig::GlobalObject* getDefaultGlobalObject()
 {

src/bun.js/bindings/napi.cpp

@@ -1703,6 +1703,30 @@ void NapiClass::visitChildrenImpl(JSCell* cell, Visitor& visitor)
 
 DEFINE_VISIT_CHILDREN(NapiClass);
 
+/**
+ * RAII wrapper to set the current NAPI function using thread local storage
+ */
+class CurrentNapiFunctionGuard {
+public:
+    void* prev;
+    Zig::GlobalObject* global;
+
+    explicit CurrentNapiFunctionGuard(void* new_napi_function, Zig::GlobalObject* globalObject)
+    {
+        global = globalObject;
+        prev = global->m_currentNapiFunction;
+        global->m_currentNapiFunction = new_napi_function;
+    }
+
+    ~CurrentNapiFunctionGuard()
+    {
+        global->m_currentNapiFunction = prev;
+    }
+
+    WTF_MAKE_NONCOPYABLE(CurrentNapiFunctionGuard);
+    WTF_MAKE_NONMOVABLE(CurrentNapiFunctionGuard);
+};
+
 template<bool ConstructCall>
 JSC_HOST_CALL_ATTRIBUTES JSC::EncodedJSValue NapiClass_ConstructorFunction(JSC::JSGlobalObject* globalObject, JSC::CallFrame* callFrame)
 {
@@ -1738,9 +1762,13 @@ JSC_HOST_CALL_ATTRIBUTES JSC::EncodedJSValue NapiClass_ConstructorFunction(JSC::
     }
 
     NAPICallFrame frame(globalObject, callFrame, napi->dataPtr(), newTarget);
-    Bun::NapiHandleScope handleScope(jsCast<Zig::GlobalObject*>(globalObject));
+    auto zigGlobalObject = jsCast<Zig::GlobalObject*>(globalObject);
+    Bun::NapiHandleScope handleScope(zigGlobalObject);
 
-    JSValue ret = toJS(napi->constructor()(napi->env(), frame.toNapi()));
+    auto constructor = napi->constructor();
+    CurrentNapiFunctionGuard guard((void*)constructor, zigGlobalObject);
+
+    JSValue ret = toJS(constructor(napi->env(), frame.toNapi()));
     napi_set_last_error(napi->env(), napi_ok);
     RETURN_IF_EXCEPTION(scope, {});
     if (ret.isEmpty()) {

src/bun.js/bindings/uv-posix-polyfills.c

@@ -5,6 +5,7 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <dlfcn.h>
 
 // libuv does the annoying thing of #undef'ing these
 #include <errno.h>
@@ -16,6 +17,12 @@
 
 void __bun_throw_not_implemented(const char* symbol_name)
 {
+    if (CrashHandler__getCurrentNapiFunction()) {
+        Dl_info info;
+        if (dladdr(CrashHandler__getCurrentNapiFunction(), &info) != 0) {
+            CrashHandler__setNapiAction(info.dli_fname);
+        }
+    }
     CrashHandler__unsupportedUVFunction(symbol_name);
 }
 

src/bun.js/bindings/uv-posix-polyfills.h

@@ -9,6 +9,9 @@
 // These functions are called by the stubs to crash with a nice error message
 // when accessing a libuv functin which we do not support on posix
 void CrashHandler__unsupportedUVFunction(const char* function_name);
+void CrashHandler__setNapiAction(const char* action);
+void CrashHandler__setCurrentNapiFunction(void* function);
+void* CrashHandler__getCurrentNapiFunction();
 void __bun_throw_not_implemented(const char* symbol_name);
 
 // libuv headers will use UV_EXTERN

src/bun.js/javascript.zig

@@ -1020,6 +1020,15 @@ pub const VirtualMachine = struct {
             };
         }
 
+        extern fn Bun__getCurrentNapiFunctionFromGlobalObject(*JSGlobalObject) ?*anyopaque;
+
+        pub fn getThreadLocalGlobalObjectCurrentNapiFunction() ?*anyopaque {
+            if (vm) |v| {
+                return Bun__getCurrentNapiFunctionFromGlobalObject(v.global);
+            }
+            return null;
+        }
+
         pub export fn Bun__thisThreadHasVM() bool {
             return vm != null;
         }

src/crash_handler.zig

@@ -133,7 +133,7 @@ pub const Action = union(enum) {
         kind: bun.ImportKind,
     } else void,
 
-    dlopen: []const u8,
+    napi: [*:0]const u8,
 
     pub fn format(act: Action, comptime _: []const u8, _: std.fmt.FormatOptions, writer: anytype) !void {
         switch (act) {
@@ -166,7 +166,7 @@ pub const Action = union(enum) {
                     res.kind.label(),
                 });
             },
-            .dlopen => |path| try writer.print("while loading native module: {s}", .{path}),
+            .napi => |path| try writer.print("inside NAPI module: {s}", .{path}),
         }
     }
 };
@@ -1863,29 +1863,59 @@ export fn CrashHandler__setInsideNativePlugin(name: ?[*:0]const u8) callconv(.C)
     inside_native_plugin = name;
 }
 
+/// /Users/zackradisic/Code/dd-trace-bun/node_modules/@datadog/native-metrics/prebuilds/darwin-arm64/node-napi.node
+/// ->
+/// @datadog/native-metrics/prebuilds/darwin-arm64/node-napi.node
+fn extractPath(path_: []const u8) ?[]const u8 {
+    var path = path_;
+    const node_modules = "node_modules";
+    const index = std.mem.lastIndexOf(u8, path, node_modules) orelse return null;
+    if (index + node_modules.len >= path.len) return null;
+    path = path[index + node_modules.len ..];
+    // posix path
+    if (path[0] == '/' and path.len > 1) {
+        return path[1..];
+    }
+    return null;
+}
+
 export fn CrashHandler__unsupportedUVFunction(name: ?[*:0]const u8) callconv(.C) void {
     bun.analytics.Features.unsupported_uv_function += 1;
     unsupported_uv_function = name;
-    std.debug.panic("unsupported uv function: {s}", .{name.?});
+    if (current_action != null and current_action.? == .napi) {
+        std.debug.panic("unsupported uv function: {s} (inside NAPI module: {s})", .{
+            name.?,
+            bun.sliceTo(current_action.?.napi, 0),
+        });
+    } else {
+        std.debug.panic("unsupported uv function: {s}", .{name.?});
+    }
 }
 
 export fn Bun__crashHandler(message_ptr: [*]u8, message_len: usize) noreturn {
     crashHandler(.{ .panic = message_ptr[0..message_len] }, null, @returnAddress());
 }
 
-export fn CrashHandler__setDlOpenAction(action: ?[*:0]const u8) void {
+export fn CrashHandler__setNapiAction(action: ?[*:0]const u8) void {
     if (action) |str| {
         bun.debugAssert(current_action == null);
-        current_action = .{ .dlopen = bun.sliceTo(str, 0) };
+        current_action = .{ .napi = str };
     } else {
-        bun.debugAssert(current_action != null and current_action.? == .dlopen);
+        bun.debugAssert(current_action != null and current_action.? == .napi);
         current_action = null;
     }
+    return;
+}
+
+export fn CrashHandler__getCurrentNapiFunction() callconv(.C) ?*anyopaque {
+    return bun.JSC.VirtualMachine.VMHolder.getThreadLocalGlobalObjectCurrentNapiFunction();
 }
 
 pub fn fixDeadCodeElimination() void {
     std.mem.doNotOptimizeAway(&CrashHandler__unsupportedUVFunction);
+    std.mem.doNotOptimizeAway(&CrashHandler__getCurrentNapiFunction);
 }
+
 comptime {
     _ = &Bun__crashHandler;
     if (!bun.Environment.isWindows) {

test/napi/uv-stub-stuff/plugin_fail_on_init.c

@@ -0,0 +1,19 @@
+// GENERATED CODE ... NO TOUCHY!!
+#include <node_api.h>
+
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <uv.h>
+
+napi_value Init(napi_env env, napi_value exports) {
+
+  // call some function which we do not support
+  int value = uv_cpumask_size();
+  printf("VALUE: %d\n", value);
+
+  return exports;
+}
+
+NAPI_MODULE(NODE_GYP_MODULE_NAME, Init)

test/napi/uv_stub.test.ts

@@ -1,14 +1,21 @@
 import { beforeAll, describe, expect, afterEach, test } from "bun:test";
 import path from "node:path";
-import { bunEnv, bunExe, makeTree, tempDirWithFiles, isWindows } from "harness";
+import { bunEnv, bunExe, makeTree, tempDirWithFiles, isWindows, isDebug } from "harness";
 import source from "./uv-stub-stuff/plugin.c";
+import source_fail_on_init from "./uv-stub-stuff/plugin_fail_on_init.c";
 import goodSource from "./uv-stub-stuff/good_plugin.c";
 import { symbols, test_skipped } from "../../src/bun.js/bindings/libuv/generate_uv_posix_stubs_constants";
 
 const symbols_to_test = symbols.filter(s => !test_skipped.includes(s));
 
+// skip on debug because it's hella slow
+const skip_on_debug = true;
+
 // We use libuv on Windows
-describe.if(!isWindows)("uv stubs", () => {
+// These tests are super slow on debug builds
+const run_test = !isWindows && (!isDebug || !skip_on_debug);
+
+describe.if(run_test)("uv stubs", () => {
   const cwd = process.cwd();
   let tempdir: string = "";
   let outdir: string = "";
@@ -16,6 +23,7 @@ describe.if(!isWindows)("uv stubs", () => {
   beforeAll(async () => {
     const files = {
       "plugin.c": await Bun.file(source).text(),
+      "plugin_fail_on_init.c": await Bun.file(source_fail_on_init).text(),
       "good_plugin.c": await Bun.file(goodSource).text(),
       "package.json": JSON.stringify({
         "name": "fake-plugin",
@@ -36,6 +44,7 @@ describe.if(!isWindows)("uv stubs", () => {
       }),
       "index.ts": `const symbol = process.argv[2]; const foo = require("./build/Release/xXx123_foo_counter_321xXx.node"); foo.callUVFunc(symbol)`,
       "nocrash.ts": `const foo = require("./build/Release/good_plugin.node");console.log('HI!')`,
+      "fail_on_init.ts": `const foo = require("./build/Release/fail_on_init.node");console.log('HI!')`,
       "binding.gyp": `{
   "targets": [
     {
@@ -51,6 +60,13 @@ describe.if(!isWindows)("uv stubs", () => {
       "include_dirs": [ ".", "./libuv" ],
       "cflags": ["-fPIC"],
       "ldflags": ["-Wl,--export-dynamic"]
+    },
+    {
+      "target_name": "fail_on_init",
+      "sources": [ "plugin_fail_on_init.c" ],
+      "include_dirs": [ ".", "./libuv" ],
+      "cflags": ["-fPIC"],
+      "ldflags": ["-Wl,--export-dynamic"]
     }
   ]
 }
@@ -74,6 +90,12 @@ describe.if(!isWindows)("uv stubs", () => {
     process.chdir(cwd);
   });
 
+  test("should crash with path if possible", async () => {
+    const { stderr } = await Bun.$`${bunExe()} run fail_on_init.ts`.cwd(tempdir).throws(false).quiet();
+    const stderrStr = stderr.toString();
+    expect(stderrStr).toMatch(/inside NAPI module: .+fail_on_init\.node/);
+  });
+
   for (const symbol of symbols_to_test) {
     test(`should crash when calling unsupported uv functions: ${symbol}`, async () => {
       console.log("GO:", symbol);
@@ -81,7 +103,8 @@ describe.if(!isWindows)("uv stubs", () => {
       const stderrStr = stderr.toString();
       expect(stderrStr).toContain("Bun encountered a crash when running a NAPI module that tried to call");
       expect(stderrStr).toContain(symbol);
-    });
+      expect(stderrStr).toMatch(/inside NAPI module: .+xXx123_foo_counter_321xXx\.node/);
+    }, 10000);
   }
 
   test("should not crash when calling supported uv functions", async () => {