Fix build

Update zig-v8-fork dependency

Optimize string.repeat

Provide arraybuffer allocation max size (pre-merging https://github.com/lightpanda-io/browser/pull/3751
since the zig-v8-fork now needs it).

.github/actions/install/action.yml

@@ -13,7 +13,7 @@ inputs:
   zig-v8:
     description: 'zig v8 version to install'
     required: false
-    default: 'v0.5.8'
+    default: 'v0.5.9'
   v8:
     description: 'v8 version to install'
     required: false

.github/actions/v8-snapshot/action.yml

@@ -13,7 +13,7 @@ inputs:
   zig-v8:
     description: 'zig-v8 release tag the prebuilt lib came from'
     required: false
-    default: 'v0.5.8'
+    default: 'v0.5.9'
 
 runs:
   using: "composite"

Dockerfile

@@ -4,7 +4,7 @@ FROM debian:stable-slim
 ARG MINISIG=0.12
 ARG ZIG_MINISIG=RWSGOq2NVecA2UPNdBUZykf1CCb147pkmdtYxgb3Ti+JO/wCYvhbAb/U
 ARG V8=15.5.35.13
-ARG ZIG_V8=v0.5.8
+ARG ZIG_V8=v0.5.9
 ARG TARGETPLATFORM
 
 RUN apt-get update -yq && \

build.zig

@@ -306,11 +306,13 @@ fn findPrebuiltV8(b: *Build, target: Build.ResolvedTarget, dev_fast: bool) ?[]co
             @tagName(target.result.cpu.arch),
         }) });
     };
-    b.dependOnFileMetadata(b.path(path));
     std.Io.Dir.cwd().access(io, rootPath(b, path), .{}) catch {
+        // Zig can't track a missing file as a configure dependency; the
+        // source-build path poisons the configure cache instead.
         std.debug.print("No prebuilt V8 at {s}; using the V8 source-build path. `make download-v8` fetches the prebuilt.\n", .{path});
         return null;
     };
+    b.dependOnFileMetadata(b.path(path));
     std.debug.print("Using prebuilt V8: {s}\n", .{path});
     return path;
 }

build.zig.zon

@@ -5,8 +5,8 @@
     .minimum_zig_version = "0.17.0",
     .dependencies = .{
         .v8 = .{
-            .url = "https://github.com/lightpanda-io/zig-v8-fork/archive/10f6a11e81fd4809988a24e3f5b3d5d4fd3a73fe.tar.gz",
-            .hash = "v8-0.0.0-xddH6w1QAwDcuJPtc73VXElNBsgPgrRBqQR__jWhy_C4",
+            .url = "https://github.com/lightpanda-io/zig-v8-fork/archive/b73e4fa2d0afe5036745ae7d332cc5cb7e7adb53.tar.gz",
+            .hash = "v8-0.0.0-xddH64tVAwDZKW4zyy2h9cKXeWfWSjupsZIwTbYxSL9T",
         },
         // .v8 = .{ .path = "../zig-v8-fork" },
         .brotli = .{

src/browser/js/Env.zig

@@ -153,7 +153,7 @@ pub fn init(app: *App, opts: InitOpts) !Env {
     v8.v8__Isolate__CreateParams__CONSTRUCT(params);
     params.snapshot_blob = @ptrCast(&snapshot.startup_data);
 
-    params.array_buffer_allocator = v8.v8__ArrayBuffer__Allocator__NewDefaultAllocator().?;
+    params.array_buffer_allocator = v8.v8__ArrayBuffer__Allocator__NewDefaultAllocator(4 * 1024 * 1024 * 1024).?;
     errdefer v8.v8__ArrayBuffer__Allocator__DELETE(params.array_buffer_allocator.?);
 
     params.external_references = &snapshot.external_references;

src/browser/js/Snapshot.zig

@@ -142,7 +142,7 @@ pub fn create() !Snapshot {
 
     var params: v8.CreateParams = undefined;
     v8.v8__Isolate__CreateParams__CONSTRUCT(&params);
-    params.array_buffer_allocator = v8.v8__ArrayBuffer__Allocator__NewDefaultAllocator();
+    params.array_buffer_allocator = v8.v8__ArrayBuffer__Allocator__NewDefaultAllocator(4 * 1024 * 1024 * 1024);
     defer v8.v8__ArrayBuffer__Allocator__DELETE(params.array_buffer_allocator.?);
     params.external_references = @ptrCast(&external_references);
 

src/string.zig

@@ -545,15 +545,15 @@ pub fn repeat(comptime s: []const u8, comptime n: usize) *const [s.len * n:0]u8
 fn Repeated(comptime s: []const u8, comptime n: usize) type {
     return struct {
         const value: [s.len * n:0]u8 = blk: {
-            var buf: [s.len * n:0]u8 = undefined;
-            if (s.len == 1) {
-                buf = @splat(s[0]);
-            } else {
-                @setEvalBranchQuota(1000 + 10 * n);
-                for (0..n) |i| @memcpy(buf[i * s.len ..][0..s.len], s);
+            // Doubling: log2(n) concatenations instead of n comptime memcpys.
+            var acc: []const u8 = "";
+            var pow: []const u8 = s;
+            var k = n;
+            while (k > 0) : (k >>= 1) {
+                if (k & 1 == 1) acc = acc ++ pow;
+                if (k > 1) pow = pow ++ pow;
             }
-            buf[buf.len] = 0;
-            break :blk buf;
+            break :blk acc[0 .. s.len * n].* ++ [_:0]u8{};
         };
     };
 }