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[turbopack] mark rcstr! allocated Rcstr values as 'static' and stop refcounting them #81994

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Merged
merged 9 commits into from
Jul 25, 2025

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lukesandberg
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@lukesandberg lukesandberg commented Jul 23, 2025

Optimize RcStr with Static Atom Support

What?

For RcStr values allocated by the rcstr! macro we shouldn't bother reference counting them since they are pinned to a static memory location already. This uses a spare tag bit 0b10 to mark such strings as 'static' which allows us to to optimize the clone and drop. The only practical cost is an additional constant bit mask when reading the value as a pointer.

Also:

  • add a fast path for PartialEq<RcStr> to handle identical values, this is useful especially for inline RcStr values but adds a fast path for refcounted strings as well.
  • compute the hash of rcstr! parameters at compile time by const-ifying the hash fn
  • allocate static storage for the PrecomputeHash struct
    - ideally we would 'const' allocate it, but String isn't const compatible. We could maybe use String::from_raw_parts but it would depend on too many implementation details. The real solution here is probably to change the definition of PrehashedString to hold an Either or a Cow? not sure if that is worth it.

Why?

Atomic ref counting is cheap but not free, we have a large number of rcstr! allocated strings and so it is pure overhead to spend any time refcounting them when the count will never hit zero.

See the upstack PR for some performance measurements on vercel-site

Closes PACK-5135

@ijjk ijjk added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Jul 23, 2025
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@lukesandberg lukesandberg changed the title tag rcstr! allocated Rcstr values as 'static' and stop refcounting them [turbopack] mark rcstr! allocated Rcstr values as 'static' and stop refcounting them Jul 23, 2025
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ijjk commented Jul 23, 2025

Tests Passed

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ijjk commented Jul 23, 2025

Stats from current PR

Default Build (Increase detected ⚠️)
General
vercel/next.js canary vercel/next.js static_rcstr Change
buildDuration 18.1s 14.7s N/A
buildDurationCached 13.9s 12.3s N/A
nodeModulesSize 443 MB 443 MB
nextStartRea..uration (ms) 392ms 398ms N/A
Client Bundles (main, webpack) Overall increase ⚠️
vercel/next.js canary vercel/next.js static_rcstr Change
194b18f3-HASH.js gzip 54.1 kB 54.1 kB N/A
2192.HASH.js gzip 169 B 169 B
4719-HASH.js gzip 5.3 kB 5.27 kB N/A
6236-HASH.js gzip 44.1 kB 44.6 kB ⚠️ +555 B
framework-HASH.js gzip 57.4 kB 57.4 kB N/A
main-app-HASH.js gzip 253 B 258 B N/A
main-HASH.js gzip 36 kB 36.1 kB ⚠️ +114 B
webpack-HASH.js gzip 1.71 kB 1.71 kB N/A
Overall change 80.2 kB 80.9 kB ⚠️ +669 B
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js static_rcstr Change
polyfills-HASH.js gzip 39.4 kB 39.4 kB
Overall change 39.4 kB 39.4 kB
Client Pages
vercel/next.js canary vercel/next.js static_rcstr Change
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_error-HASH.js gzip 182 B 182 B
amp-HASH.js gzip 501 B 500 B N/A
css-HASH.js gzip 335 B 333 B N/A
dynamic-HASH.js gzip 1.83 kB 1.83 kB N/A
edge-ssr-HASH.js gzip 256 B 255 B N/A
head-HASH.js gzip 350 B 351 B N/A
hooks-HASH.js gzip 382 B 382 B
image-HASH.js gzip 4.68 kB 4.66 kB N/A
index-HASH.js gzip 259 B 259 B
link-HASH.js gzip 2.52 kB 2.52 kB N/A
routerDirect..HASH.js gzip 319 B 316 B N/A
script-HASH.js gzip 386 B 386 B
withRouter-HASH.js gzip 316 B 315 B N/A
1afbb74e6ecf..834.css gzip 106 B 106 B
Overall change 1.51 kB 1.51 kB
Client Build Manifests
vercel/next.js canary vercel/next.js static_rcstr Change
_buildManifest.js gzip 752 B 752 B
Overall change 752 B 752 B
Rendered Page Sizes
vercel/next.js canary vercel/next.js static_rcstr Change
index.html gzip 523 B 524 B N/A
link.html gzip 537 B 539 B N/A
withRouter.html gzip 520 B 520 B
Overall change 520 B 520 B
Edge SSR bundle Size
vercel/next.js canary vercel/next.js static_rcstr Change
edge-ssr.js gzip 121 kB 121 kB N/A
page.js gzip 221 kB 215 kB N/A
Overall change 0 B 0 B
Middleware size Overall increase ⚠️
vercel/next.js canary vercel/next.js static_rcstr Change
middleware-b..fest.js gzip 678 B 676 B N/A
middleware-r..fest.js gzip 155 B 157 B N/A
middleware.js gzip 32.1 kB 32.2 kB ⚠️ +116 B
edge-runtime..pack.js gzip 853 B 853 B
Overall change 32.9 kB 33.1 kB ⚠️ +116 B
Next Runtimes
vercel/next.js canary vercel/next.js static_rcstr Change
app-page-exp...dev.js gzip 279 kB 279 kB N/A
app-page-exp..prod.js gzip 154 kB 154 kB
app-page-tur...dev.js gzip 279 kB 279 kB
app-page-tur..prod.js gzip 154 kB 154 kB
app-page-tur...dev.js gzip 264 kB 264 kB
app-page-tur..prod.js gzip 148 kB 148 kB
app-page.run...dev.js gzip 264 kB 264 kB N/A
app-page.run..prod.js gzip 148 kB 148 kB
app-route-ex...dev.js gzip 69.1 kB 69.1 kB
app-route-ex..prod.js gzip 48.6 kB 48.6 kB
app-route-tu...dev.js gzip 69.2 kB 69.2 kB
app-route-tu..prod.js gzip 48.6 kB 48.6 kB
app-route-tu...dev.js gzip 68.5 kB 68.5 kB
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app-route.ru...dev.js gzip 68.5 kB 68.5 kB
app-route.ru..prod.js gzip 48.2 kB 48.2 kB
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dist_client_...dev.js gzip 320 B 320 B
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pages-api-tu...dev.js gzip 42.2 kB 42.2 kB
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pages-api.ru..prod.js gzip 32.5 kB 32.5 kB
pages-turbo....dev.js gzip 52.3 kB 52.3 kB
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server.runti..prod.js gzip 59.5 kB 59.5 kB
Overall change 2.01 MB 2.01 MB
build cache Overall increase ⚠️
vercel/next.js canary vercel/next.js static_rcstr Change
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index.pack gzip 90.5 kB 92.5 kB ⚠️ +1.94 kB
Overall change 2.89 MB 2.9 MB ⚠️ +3.08 kB
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+                cleanupB.current = applyRef(refB, current);
+              }
+            }
+          },
+          [refA, refB]
+        );
+      }
+      function applyRef(refA, current) {
+        if (typeof refA === "function") {
+          const cleanup = refA(current);
+          if (typeof cleanup === "function") {
+            return cleanup;
+          } else {
+            return () => refA(null);
+          }
+        } else {
+          refA.current = current;
+          return () => {
+            refA.current = null;
+          };
+        }
+      }
+      if (
+        (typeof exports.default === "function" ||
+          (typeof exports.default === "object" && exports.default !== null)) &&
+        typeof exports.default.__esModule === "undefined"
+      ) {
+        Object.defineProperty(exports.default, "__esModule", {
+          value: true,
+        });
+        Object.assign(exports.default, exports);
+        module.exports = exports.default;
+      } //# sourceMappingURL=use-merged-ref.js.map
+
+      /***/
+    },
+
+    /***/ 3353: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5526);
+
+      /***/
+    },
+
+    /***/ 3594: /***/ (
+      __unused_webpack_module,
+      __webpack_exports__,
+      __webpack_require__
+    ) => {
+      "use strict";
+      // ESM COMPAT FLAG
+      __webpack_require__.r(__webpack_exports__);
+
+      // EXPORTS
+      __webpack_require__.d(__webpack_exports__, {
+        __N_SSP: () => /* binding */ __N_SSP,
+        default: () => /* binding */ pages_image,
+      });
+
+      // EXTERNAL MODULE: ./node_modules/.pnpm/[email protected]/node_modules/react/jsx-runtime.js
+      var jsx_runtime = __webpack_require__(5640);
+      // EXTERNAL MODULE: ./node_modules/.pnpm/next@[email protected][email protected][email protected]/node_modules/next/image.js
+      var next_image = __webpack_require__(3353);
+      var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
+      /* harmony default export */ const nextjs = {
+        src: "/_next/static/media/nextjs.cae0b805.png",
+        height: 1347,
+        width: 1626,
+        blurDataURL:
+          "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAHCAMAAAACh/xsAAAAD1BMVEX////x8fH6+vrb29vo6Oh8o70bAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAH0lEQVR4nGNgwARMjIyMjCAGCzMzMwsTRISJCcRABwAEcAAkLCQfgAAAAABJRU5ErkJggg==",
+        blurWidth: 8,
+        blurHeight: 7,
+      }; // ./pages/image.js
+      function ImagePage(props) {
+        return /*#__PURE__*/ (0, jsx_runtime.jsxs)(jsx_runtime.Fragment, {
+          children: [
+            /*#__PURE__*/ (0, jsx_runtime.jsx)("h1", {
+              children: "next/image example",
+            }),
+            /*#__PURE__*/ (0, jsx_runtime.jsx)(image_default(), {
+              src: nextjs,
+              placeholder: "blur",
+            }),
+          ],
+        });
+      }
+      var __N_SSP = true;
+      /* harmony default export */ const pages_image = ImagePage;
+
+      /***/
+    },
+
+    /***/ 3854: /***/ (
       __unused_webpack_module,
       exports,
       __webpack_require__
@@ -34,9 +217,9 @@
           return getImgProps;
         },
       });
-      const _warnonce = __webpack_require__(5127);
-      const _imageblursvg = __webpack_require__(4287);
-      const _imageconfig = __webpack_require__(2795);
+      const _warnonce = __webpack_require__(3603);
+      const _imageblursvg = __webpack_require__(7835);
+      const _imageconfig = __webpack_require__(6799);
       const VALID_LOADING_VALUES =
         /* unused pure expression or super */ null && [
           "lazy",
@@ -463,55 +646,69 @@
       /***/
     },
 
-    /***/ 3444: /***/ (
+    /***/ 5526: /***/ (
       __unused_webpack_module,
-      __webpack_exports__,
+      exports,
       __webpack_require__
     ) => {
       "use strict";
-      // ESM COMPAT FLAG
-      __webpack_require__.r(__webpack_exports__);
 
-      // EXPORTS
-      __webpack_require__.d(__webpack_exports__, {
-        __N_SSP: () => /* binding */ __N_SSP,
-        default: () => /* binding */ pages_image,
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
       });
-
-      // EXTERNAL MODULE: ./node_modules/.pnpm/[email protected]/node_modules/react/jsx-runtime.js
-      var jsx_runtime = __webpack_require__(5640);
-      // EXTERNAL MODULE: ./node_modules/.pnpm/next@[email protected][email protected][email protected]/node_modules/next/image.js
-      var next_image = __webpack_require__(6359);
-      var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
-      /* harmony default export */ const nextjs = {
-        src: "/_next/static/media/nextjs.cae0b805.png",
-        height: 1347,
-        width: 1626,
-        blurDataURL:
-          "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAHCAMAAAACh/xsAAAAD1BMVEX////x8fH6+vrb29vo6Oh8o70bAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAH0lEQVR4nGNgwARMjIyMjCAGCzMzMwsTRISJCcRABwAEcAAkLCQfgAAAAABJRU5ErkJggg==",
-        blurWidth: 8,
-        blurHeight: 7,
-      }; // ./pages/image.js
-      function ImagePage(props) {
-        return /*#__PURE__*/ (0, jsx_runtime.jsxs)(jsx_runtime.Fragment, {
-          children: [
-            /*#__PURE__*/ (0, jsx_runtime.jsx)("h1", {
-              children: "next/image example",
-            }),
-            /*#__PURE__*/ (0, jsx_runtime.jsx)(image_default(), {
-              src: nextjs,
-              placeholder: "blur",
-            }),
-          ],
+      0 && 0;
+      function _export(target, all) {
+        for (var name in all)
+          Object.defineProperty(target, name, {
+            enumerable: true,
+            get: all[name],
+          });
+      }
+      _export(exports, {
+        default: function () {
+          return _default;
+        },
+        getImageProps: function () {
+          return getImageProps;
+        },
+      });
+      const _interop_require_default = __webpack_require__(1532);
+      const _getimgprops = __webpack_require__(3854);
+      const _imagecomponent = __webpack_require__(8350);
+      const _imageloader = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(1206)
+      );
+      function getImageProps(imgProps) {
+        const { props } = (0, _getimgprops.getImgProps)(imgProps, {
+          defaultLoader: _imageloader.default,
+          // This is replaced by webpack define plugin
+          imgConf: {
+            deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
+            imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
+            path: "/_next/image",
+            loader: "default",
+            dangerouslyAllowSVG: false,
+            unoptimized: false,
+          },
         });
+        // Normally we don't care about undefined props because we pass to JSX,
+        // but this exported function could be used by the end user for anything
+        // so we delete undefined props to clean it up a little.
+        for (const [key, value] of Object.entries(props)) {
+          if (value === undefined) {
+            delete props[key];
+          }
+        }
+        return {
+          props,
+        };
       }
-      var __N_SSP = true;
-      /* harmony default export */ const pages_image = ImagePage;
+      const _default = _imagecomponent.Image; //# sourceMappingURL=image-external.js.map
 
       /***/
     },
 
-    /***/ 4287: /***/ (__unused_webpack_module, exports) => {
+    /***/ 7835: /***/ (__unused_webpack_module, exports) => {
       "use strict";
       /**
        * A shared function, used on both client and server, to generate a SVG blur placeholder.
@@ -566,85 +763,7 @@
       /***/
     },
 
-    /***/ 4985: /***/ (module, exports, __webpack_require__) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "useMergedRef", {
-        enumerable: true,
-        get: function () {
-          return useMergedRef;
-        },
-      });
-      const _react = __webpack_require__(148);
-      function useMergedRef(refA, refB) {
-        const cleanupA = (0, _react.useRef)(null);
-        const cleanupB = (0, _react.useRef)(null);
-        // NOTE: In theory, we could skip the wrapping if only one of the refs is non-null.
-        // (this happens often if the user doesn't pass a ref to Link/Form/Image)
-        // But this can cause us to leak a cleanup-ref into user code (e.g. via `<Link legacyBehavior>`),
-        // and the user might pass that ref into ref-merging library that doesn't support cleanup refs
-        // (because it hasn't been updated for React 19)
-        // which can then cause things to blow up, because a cleanup-returning ref gets called with `null`.
-        // So in practice, it's safer to be defensive and always wrap the ref, even on React 19.
-        return (0, _react.useCallback)(
-          (current) => {
-            if (current === null) {
-              const cleanupFnA = cleanupA.current;
-              if (cleanupFnA) {
-                cleanupA.current = null;
-                cleanupFnA();
-              }
-              const cleanupFnB = cleanupB.current;
-              if (cleanupFnB) {
-                cleanupB.current = null;
-                cleanupFnB();
-              }
-            } else {
-              if (refA) {
-                cleanupA.current = applyRef(refA, current);
-              }
-              if (refB) {
-                cleanupB.current = applyRef(refB, current);
-              }
-            }
-          },
-          [refA, refB]
-        );
-      }
-      function applyRef(refA, current) {
-        if (typeof refA === "function") {
-          const cleanup = refA(current);
-          if (typeof cleanup === "function") {
-            return cleanup;
-          } else {
-            return () => refA(null);
-          }
-        } else {
-          refA.current = current;
-          return () => {
-            refA.current = null;
-          };
-        }
-      }
-      if (
-        (typeof exports.default === "function" ||
-          (typeof exports.default === "object" && exports.default !== null)) &&
-        typeof exports.default.__esModule === "undefined"
-      ) {
-        Object.defineProperty(exports.default, "__esModule", {
-          value: true,
-        });
-        Object.assign(exports.default, exports);
-        module.exports = exports.default;
-      } //# sourceMappingURL=use-merged-ref.js.map
-
-      /***/
-    },
-
-    /***/ 5898: /***/ (module, exports, __webpack_require__) => {
+    /***/ 8350: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -666,17 +785,17 @@
         __webpack_require__(7897)
       );
       const _head = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5207)
+        __webpack_require__(8843)
       );
-      const _getimgprops = __webpack_require__(2514);
-      const _imageconfig = __webpack_require__(2795);
-      const _imageconfigcontextsharedruntime = __webpack_require__(2349);
-      const _warnonce = __webpack_require__(5127);
-      const _routercontextsharedruntime = __webpack_require__(3556);
+      const _getimgprops = __webpack_require__(3854);
+      const _imageconfig = __webpack_require__(6799);
+      const _imageconfigcontextsharedruntime = __webpack_require__(3905);
+      const _warnonce = __webpack_require__(3603);
+      const _routercontextsharedruntime = __webpack_require__(6712);
       const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5970)
+        __webpack_require__(1206)
       );
-      const _usemergedref = __webpack_require__(4985);
+      const _usemergedref = __webpack_require__(1765);
       // This is replaced by webpack define plugin
       const configEnv = {
         deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
@@ -1001,132 +1120,13 @@
 
       /***/
     },
-
-    /***/ 5970: /***/ (__unused_webpack_module, exports) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "default", {
-        enumerable: true,
-        get: function () {
-          return _default;
-        },
-      });
-      const DEFAULT_Q = 75;
-      function defaultLoader(param) {
-        let { config, src, width, quality } = param;
-        var _config_qualities;
-        if (false) {
-        }
-        const q =
-          quality ||
-          ((_config_qualities = config.qualities) == null
-            ? void 0
-            : _config_qualities.reduce((prev, cur) =>
-                Math.abs(cur - DEFAULT_Q) < Math.abs(prev - DEFAULT_Q)
-                  ? cur
-                  : prev
-              )) ||
-          DEFAULT_Q;
-        return (
-          config.path +
-          "?url=" +
-          encodeURIComponent(src) +
-          "&w=" +
-          width +
-          "&q=" +
-          q +
-          (src.startsWith("/_next/static/media/") && false ? 0 : "")
-        );
-      }
-      // We use this to determine if the import is the default loader
-      // or a custom loader defined by the user in next.config.js
-      defaultLoader.__next_img_default = true;
-      const _default = defaultLoader; //# sourceMappingURL=image-loader.js.map
-
-      /***/
-    },
-
-    /***/ 6359: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(8986);
-
-      /***/
-    },
-
-    /***/ 8986: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      0 && 0;
-      function _export(target, all) {
-        for (var name in all)
-          Object.defineProperty(target, name, {
-            enumerable: true,
-            get: all[name],
-          });
-      }
-      _export(exports, {
-        default: function () {
-          return _default;
-        },
-        getImageProps: function () {
-          return getImageProps;
-        },
-      });
-      const _interop_require_default = __webpack_require__(1532);
-      const _getimgprops = __webpack_require__(2514);
-      const _imagecomponent = __webpack_require__(5898);
-      const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5970)
-      );
-      function getImageProps(imgProps) {
-        const { props } = (0, _getimgprops.getImgProps)(imgProps, {
-          defaultLoader: _imageloader.default,
-          // This is replaced by webpack define plugin
-          imgConf: {
-            deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
-            imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
-            path: "/_next/image",
-            loader: "default",
-            dangerouslyAllowSVG: false,
-            unoptimized: false,
-          },
-        });
-        // Normally we don't care about undefined props because we pass to JSX,
-        // but this exported function could be used by the end user for anything
-        // so we delete undefined props to clean it up a little.
-        for (const [key, value] of Object.entries(props)) {
-          if (value === undefined) {
-            delete props[key];
-          }
-        }
-        return {
-          props,
-        };
-      }
-      const _default = _imagecomponent.Image; //# sourceMappingURL=image-external.js.map
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(2198)
+      __webpack_exec__(264)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for index-HASH.js
@@ -1,7 +1,24 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3332],
   {
-    /***/ 9418: /***/ (
+    /***/ 8230: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/",
+        function () {
+          return __webpack_require__(8696);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 8696: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -19,30 +36,13 @@
 
       /***/
     },
-
-    /***/ 9532: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/",
-        function () {
-          return __webpack_require__(9418);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9532)
+      __webpack_exec__(8230)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for link-HASH.js
@@ -1,125 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4672],
   {
-    /***/ 1854: /***/ (
-      __unused_webpack_module,
-      __webpack_exports__,
-      __webpack_require__
-    ) => {
-      "use strict";
-      __webpack_require__.r(__webpack_exports__);
-      /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-        /* harmony export */ __N_SSP: () => /* binding */ __N_SSP,
-        /* harmony export */ default: () => __WEBPACK_DEFAULT_EXPORT__,
-        /* harmony export */
-      });
-      /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
-        __webpack_require__(5640);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(8770);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1___default =
-        /*#__PURE__*/ __webpack_require__.n(
-          next_link__WEBPACK_IMPORTED_MODULE_1__
-        );
-
-      function aLink(props) {
-        return /*#__PURE__*/ (0,
-        react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsxs)("div", {
-          children: [
-            /*#__PURE__*/ (0,
-            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)("h3", {
-              children: "A Link page!",
-            }),
-            /*#__PURE__*/ (0,
-            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)(
-              next_link__WEBPACK_IMPORTED_MODULE_1___default(),
-              {
-                href: "/",
-                children: "Go to /",
-              }
-            ),
-          ],
-        });
-      }
-      var __N_SSP = true;
-      /* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = aLink;
-
-      /***/
-    },
-
-    /***/ 3199: /***/ (__unused_webpack_module, exports) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "errorOnce", {
-        enumerable: true,
-        get: function () {
-          return errorOnce;
-        },
-      });
-      let errorOnce = (_) => {};
-      if (false) {
-      } //# sourceMappingURL=error-once.js.map
-
-      /***/
-    },
-
-    /***/ 3568: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/link",
-        function () {
-          return __webpack_require__(1854);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 3857: /***/ (module, exports, __webpack_require__) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "getDomainLocale", {
-        enumerable: true,
-        get: function () {
-          return getDomainLocale;
-        },
-      });
-      const _normalizetrailingslash = __webpack_require__(4869);
-      const basePath =
-        /* unused pure expression or super */ null && (false || "");
-      function getDomainLocale(path, locale, locales, domainLocales) {
-        if (false) {
-        } else {
-          return false;
-        }
-      }
-      if (
-        (typeof exports.default === "function" ||
-          (typeof exports.default === "object" && exports.default !== null)) &&
-        typeof exports.default.__esModule === "undefined"
-      ) {
-        Object.defineProperty(exports.default, "__esModule", {
-          value: true,
-        });
-        Object.assign(exports.default, exports);
-        module.exports = exports.default;
-      } //# sourceMappingURL=get-domain-locale.js.map
-
-      /***/
-    },
-
-    /***/ 3947: /***/ (module, exports, __webpack_require__) => {
+    /***/ 591: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -146,17 +28,17 @@
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
         __webpack_require__(148)
       );
-      const _resolvehref = __webpack_require__(3161);
-      const _islocalurl = __webpack_require__(2309);
-      const _formaturl = __webpack_require__(3768);
-      const _utils = __webpack_require__(5554);
-      const _addlocale = __webpack_require__(7591);
-      const _routercontextsharedruntime = __webpack_require__(3556);
-      const _useintersection = __webpack_require__(5624);
-      const _getdomainlocale = __webpack_require__(3857);
-      const _addbasepath = __webpack_require__(4356);
-      const _usemergedref = __webpack_require__(4985);
-      const _erroronce = __webpack_require__(3199);
+      const _resolvehref = __webpack_require__(5837);
+      const _islocalurl = __webpack_require__(5953);
+      const _formaturl = __webpack_require__(6212);
+      const _utils = __webpack_require__(6950);
+      const _addlocale = __webpack_require__(6467);
+      const _routercontextsharedruntime = __webpack_require__(6712);
+      const _useintersection = __webpack_require__(9692);
+      const _getdomainlocale = __webpack_require__(6850);
+      const _addbasepath = __webpack_require__(4928);
+      const _usemergedref = __webpack_require__(1765);
+      const _erroronce = __webpack_require__(8659);
       const prefetched = new Set();
       function prefetch(router, href, as, options) {
         if (false) {
@@ -545,7 +427,17 @@
       /***/
     },
 
-    /***/ 4985: /***/ (module, exports, __webpack_require__) => {
+    /***/ 1148: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(591);
+
+      /***/
+    },
+
+    /***/ 1765: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -623,7 +515,125 @@
       /***/
     },
 
-    /***/ 5624: /***/ (module, exports, __webpack_require__) => {
+    /***/ 5436: /***/ (
+      __unused_webpack_module,
+      __webpack_exports__,
+      __webpack_require__
+    ) => {
+      "use strict";
+      __webpack_require__.r(__webpack_exports__);
+      /* harmony export */ __webpack_require__.d(__webpack_exports__, {
+        /* harmony export */ __N_SSP: () => /* binding */ __N_SSP,
+        /* harmony export */ default: () => __WEBPACK_DEFAULT_EXPORT__,
+        /* harmony export */
+      });
+      /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
+        __webpack_require__(5640);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
+        __webpack_require__(1148);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1___default =
+        /*#__PURE__*/ __webpack_require__.n(
+          next_link__WEBPACK_IMPORTED_MODULE_1__
+        );
+
+      function aLink(props) {
+        return /*#__PURE__*/ (0,
+        react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsxs)("div", {
+          children: [
+            /*#__PURE__*/ (0,
+            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)("h3", {
+              children: "A Link page!",
+            }),
+            /*#__PURE__*/ (0,
+            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)(
+              next_link__WEBPACK_IMPORTED_MODULE_1___default(),
+              {
+                href: "/",
+                children: "Go to /",
+              }
+            ),
+          ],
+        });
+      }
+      var __N_SSP = true;
+      /* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = aLink;
+
+      /***/
+    },
+
+    /***/ 6850: /***/ (module, exports, __webpack_require__) => {
+      "use strict";
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "getDomainLocale", {
+        enumerable: true,
+        get: function () {
+          return getDomainLocale;
+        },
+      });
+      const _normalizetrailingslash = __webpack_require__(6457);
+      const basePath =
+        /* unused pure expression or super */ null && (false || "");
+      function getDomainLocale(path, locale, locales, domainLocales) {
+        if (false) {
+        } else {
+          return false;
+        }
+      }
+      if (
+        (typeof exports.default === "function" ||
+          (typeof exports.default === "object" && exports.default !== null)) &&
+        typeof exports.default.__esModule === "undefined"
+      ) {
+        Object.defineProperty(exports.default, "__esModule", {
+          value: true,
+        });
+        Object.assign(exports.default, exports);
+        module.exports = exports.default;
+      } //# sourceMappingURL=get-domain-locale.js.map
+
+      /***/
+    },
+
+    /***/ 8659: /***/ (__unused_webpack_module, exports) => {
+      "use strict";
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "errorOnce", {
+        enumerable: true,
+        get: function () {
+          return errorOnce;
+        },
+      });
+      let errorOnce = (_) => {};
+      if (false) {
+      } //# sourceMappingURL=error-once.js.map
+
+      /***/
+    },
+
+    /***/ 9666: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/link",
+        function () {
+          return __webpack_require__(5436);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9692: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -636,7 +646,7 @@
         },
       });
       const _react = __webpack_require__(148);
-      const _requestidlecallback = __webpack_require__(3543);
+      const _requestidlecallback = __webpack_require__(315);
       const hasIntersectionObserver =
         typeof IntersectionObserver === "function";
       const observers = new Map();
@@ -748,23 +758,13 @@
 
       /***/
     },
-
-    /***/ 8770: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(3947);
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(3568)
+      __webpack_exec__(9666)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for routerDirect-HASH.js
@@ -1,7 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [188],
   {
-    /***/ 3618: /***/ (
+    /***/ 76: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -16,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(4631);
+        __webpack_require__(9413);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -36,17 +36,7 @@
       /***/
     },
 
-    /***/ 4631: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(7086);
-
-      /***/
-    },
-
-    /***/ 7824: /***/ (
+    /***/ 1810: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
@@ -54,7 +44,7 @@
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/routerDirect",
         function () {
-          return __webpack_require__(3618);
+          return __webpack_require__(76);
         },
       ]);
       if (false) {
@@ -62,13 +52,23 @@
 
       /***/
     },
+
+    /***/ 9413: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5282);
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(7824)
+      __webpack_exec__(1810)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for script-HASH.js
@@ -1,24 +1,17 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [1209],
   {
-    /***/ 1984: /***/ (
-      __unused_webpack_module,
+    /***/ 2227: /***/ (
+      module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/script",
-        function () {
-          return __webpack_require__(5769);
-        },
-      ]);
-      if (false) {
-      }
+      module.exports = __webpack_require__(5984);
 
       /***/
     },
 
-    /***/ 5769: /***/ (
+    /***/ 3043: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -33,7 +26,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(8293);
+        __webpack_require__(2227);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_script__WEBPACK_IMPORTED_MODULE_1__
@@ -66,12 +59,19 @@
       /***/
     },
 
-    /***/ 8293: /***/ (
-      module,
+    /***/ 3642: /***/ (
+      __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(900);
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/script",
+        function () {
+          return __webpack_require__(3043);
+        },
+      ]);
+      if (false) {
+      }
 
       /***/
     },
@@ -81,7 +81,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(1984)
+      __webpack_exec__(3642)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for withRouter-HASH.js
@@ -1,34 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3263],
   {
-    /***/ 4631: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(7086);
-
-      /***/
-    },
-
-    /***/ 9216: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/withRouter",
-        function () {
-          return __webpack_require__(9803);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 9803: /***/ (
+    /***/ 1089: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -43,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(4631);
+        __webpack_require__(9413);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -61,13 +34,40 @@
 
       /***/
     },
+
+    /***/ 3962: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/withRouter",
+        function () {
+          return __webpack_require__(1089);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9413: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5282);
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9216)
+      __webpack_exec__(3962)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for 4719-HASH.js

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Diff for 6236-HASH.js

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Diff for main-HASH.js

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Commit: 7896116

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codspeed-hq bot commented Jul 24, 2025

CodSpeed Performance Report

Merging #81994 will not alter performance

Comparing static_rcstr (5493b7b) with canary (d7cd6f6)

Summary

✅ 9 untouched benchmarks

@lukesandberg lukesandberg marked this pull request as ready for review July 24, 2025 20:22
@lukesandberg lukesandberg requested a review from sokra July 24, 2025 20:22
This removes branches from the allocation path and instead we just need to tag the pointer on each call.  To do this we needed PrehashedString to be const compatible which required some indirection to allow it to just directly store static strings.  This will add a bit of overhead to `as_str`, `eq` and `drop` but speed up allocation.
@lukesandberg lukesandberg requested a review from sokra July 25, 2025 17:42
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PTAL: Changed to make PrehashedString const compatible. I think this is unambiguously superior but it does come with a subtle tradeoff when we dereference the string

@@ -339,27 +368,45 @@ impl Drop for RcStr {
}
}

// Exports for our macro
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The Drop implementation for RcStr doesn't handle STATIC_TAG properly, which could lead to incorrect behavior when dropping static strings.

View Details

Analysis

The Drop implementation only checks for DYNAMIC_TAG and calls restore_arc for those cases, but it doesn't handle the new STATIC_TAG (0b_10) that was introduced in this PR. Static strings are tagged with STATIC_TAG and point to statically allocated PrehashedString structs that should never be dropped via restore_arc since they are not Arc-managed.

Currently, when a static string is dropped, the Drop implementation does nothing (since it only matches DYNAMIC_TAG), which is actually correct behavior for static strings. However, this creates a subtle dependency on the exact tag values that is not explicitly documented or enforced.

The issue is that the code doesn't make it clear that static strings should not be processed in the Drop implementation, and future changes to the tag system could break this assumption.


Recommendation

Update the Drop implementation to explicitly handle all tag types:

impl Drop for RcStr {
    fn drop(&mut self) {
        match self.tag() {
            DYNAMIC_TAG => unsafe { drop(dynamic::restore_arc(self.unsafe_data)) },
            STATIC_TAG => {
                // Static strings are never dropped - they have static lifetime
                // No action needed
            },
            INLINE_TAG => {
                // Inline strings are stored directly in the tagged value
                // No action needed
            },
            _ => unsafe { debug_unreachable!() },
        }
    }
}

This makes the behavior explicit and prevents future bugs if tag values change.

// Tag it as a static pointer
entry = ((entry as usize) | STATIC_TAG as usize) as *mut PrehashedString;
let ptr: NonNull<PrehashedString> = unsafe {
// Safety: Box::into_raw returns a non-null pointer
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The safety comment for NonNull::new_unchecked incorrectly states "Box::into_raw returns a non-null pointer" but this function doesn't use Box::into_raw.

View Details

Analysis

The safety comment on line 96 is misleading and incorrect. The function new_static_atom takes a reference to a static PrehashedString and converts it to a tagged pointer, but it never uses Box::into_raw. The comment appears to be copied from another function.

The actual safety requirement for NonNull::new_unchecked(entry as *mut _) is that entry is non-null. In this case, safety is ensured because:

  1. We start with string as *const PrehashedString where string is a &'static PrehashedString (references are never null)
  2. We then tag it with | STATIC_TAG as usize, which only affects the lower bits and preserves the non-null property
  3. The conversion as *mut PrehashedString and as *mut _ preserves non-null-ness

The incorrect comment could mislead future maintainers about the actual safety invariants.


Recommendation

Replace the incorrect safety comment with an accurate one:

// Safety: entry is non-null because it's derived from a valid reference and tagging preserves non-null-ness
NonNull::new_unchecked(entry as *mut _)

@lukesandberg lukesandberg merged commit 261a5c3 into canary Jul 25, 2025
166 checks passed
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Merge activity

@lukesandberg lukesandberg deleted the static_rcstr branch July 25, 2025 19:02
lukesandberg added a commit that referenced this pull request Jul 26, 2025
lukesandberg added a commit to lukesandberg/swc that referenced this pull request Jul 26, 2025
…efcounting them

The Clone and Drop routines will treat them like `inline` atoms but their storage will instead be in a `static` item.

This should speed up initialization and access to `atom!` values since there is no more lazy lock just a simple pointer tag.  This does complicate `eq` and `hash` a bit as well as `as_str` to handle the new location

This follows a similar pattern used in turbopack as of vercel/next.js#81994.  Things are different here due to the use of `ThinArc` for storage, which required me to introduce a separate struct for the `&'static str` case.
lukesandberg added a commit to lukesandberg/swc that referenced this pull request Jul 27, 2025
…efcounting them

The Clone and Drop routines will treat them like `inline` atoms but their storage will instead be in a `static` item.

This should speed up initialization and access to `atom!` values since there is no more lazy lock just a simple pointer tag.  This does complicate `eq` and `hash` a bit as well as `as_str` to handle the new location

This follows a similar pattern used in turbopack as of vercel/next.js#81994.  Things are different here due to the use of `ThinArc` for storage, which required me to introduce a separate struct for the `&'static str` case.
lukesandberg added a commit that referenced this pull request Jul 28, 2025
…`hash` (#82084)

Fix safety comment and hash implementation in turbo-rcstr

Noticed this while porting #81994 to swc
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