[internal] Add debug timer

2 files changed, 33 insertions, 2 deletions

diff --git a/src/bun.js/node/syscall.zig b/src/bun.js/node/syscall.zig
index 9d5b06540..cb423c2f5 100644
--- a/src/bun.js/node/syscall.zig
+++ b/src/bun.js/node/syscall.zig
@@ -326,11 +326,12 @@ pub fn pwrite(fd: os.fd_t, bytes: []const u8, offset: i64) Maybe(usize) {
 }
 
 pub fn read(fd: os.fd_t, buf: []u8) Maybe(usize) {
+    const debug_timer = bun.Output.DebugTimer.start();
     const adjusted_len = @minimum(buf.len, max_count);
     if (comptime Environment.isMac) {
         const rc = system.@"read$NOCANCEL"(fd, buf.ptr, adjusted_len);
 
-        log("read({d}, {d}) = {d}", .{ fd, adjusted_len, rc });
+        log("read({d}, {d}) = {d} ({any})", .{ fd, adjusted_len, rc, debug_timer });
 
         if (Maybe(usize).errnoSys(rc, .read)) |err| {
             return err;
@@ -339,7 +340,7 @@ pub fn read(fd: os.fd_t, buf: []u8) Maybe(usize) {
     } else {
         while (true) {
             const rc = sys.read(fd, buf.ptr, adjusted_len);
-            log("read({d}, {d}) = {d}", .{ fd, adjusted_len, rc });
+            log("read({d}, {d}) = {d} ({any})", .{ fd, adjusted_len, rc, debug_timer });
 
             if (Maybe(usize).errnoSysFd(rc, .read, fd)) |err| {
                 if (err.getErrno() == .INTR) continue;
diff --git a/src/output.zig b/src/output.zig
index d6ba81a3b..55cd16677 100644
--- a/src/output.zig
+++ b/src/output.zig
@@ -617,3 +617,33 @@ pub fn printError(comptime fmt: string, args: anytype) void {
             std.fmt.format(source.error_stream.writer(), fmt, args) catch {};
     }
 }
+
+pub const DebugTimer = struct {
+    timer: @import("global.zig").DebugOnly(std.time.Timer) = undefined,
+
+    pub fn start() DebugTimer {
+        if (comptime Environment.isDebug) {
+            return DebugTimer{
+                .timer = std.time.Timer.start() catch unreachable,
+            };
+        } else {
+            return .{};
+        }
+    }
+
+    pub const WriteError = error{};
+
+    pub fn format(self: DebugTimer, comptime _: []const u8, opts: std.fmt.FormatOptions, writer_: anytype) WriteError!void {
+        if (comptime Environment.isDebug) {
+            var timer = self.timer;
+            var _opts = opts;
+            _opts.precision = 3;
+            std.fmt.formatFloatDecimal(
+                @floatCast(f64, @intToFloat(f128, timer.read()) / std.time.ns_per_ms),
+                _opts,
+                writer_,
+            ) catch unreachable;
+            writer_.writeAll("ms") catch unreachable;
+        }
+    }
+};