zig 0.16.0 stable

std.time.Instant -> std.Io.Timestamp (Timing helper gets an io handle).
.monotonic clock variant -> .awake.
50 tests pass.

src/main.zig

@@ -157,7 +157,7 @@ pub fn main(init: std.process.Init) !void {
         }
         // Default to -O0 for run (faster compile) unless user explicitly set --opt
         if (!explicit_opt) target_config.opt_level = .none;
-        var timer = Timing.init(show_timing);
+        var timer = Timing.init(io, show_timing);
 
         // Phase A: read + parse + resolveImports (for cache key)
         timer.mark();
@@ -409,14 +409,14 @@ fn dumpSxIR(allocator: std.mem.Allocator, io: std.Io, input_path: []const u8) !v
 }
 
 fn emitIR(allocator: std.mem.Allocator, io: std.Io, input_path: []const u8, target_config: sx.target.TargetConfig) !void {
-    var timer = Timing.init(false);
+    var timer = Timing.init(io, false);
     var comp = try compilePipeline(allocator, io, input_path, target_config, &timer);
     defer comp.deinit();
     comp.ir_emitter.?.printIR();
 }
 
 fn emitAsm(allocator: std.mem.Allocator, io: std.Io, input_path: []const u8, target_config: sx.target.TargetConfig) !void {
-    var timer = Timing.init(false);
+    var timer = Timing.init(io, false);
     var comp = try compilePipeline(allocator, io, input_path, target_config, &timer);
     defer comp.deinit();
     const asm_path = target_config.output_path orelse blk: {
@@ -429,7 +429,7 @@ fn emitAsm(allocator: std.mem.Allocator, io: std.Io, input_path: []const u8, tar
 }
 
 fn compile(allocator: std.mem.Allocator, io: std.Io, input_path: []const u8, output_path: []const u8, target_config: sx.target.TargetConfig, show_timing: bool, enable_cache: bool) !void {
-    var timer = Timing.init(show_timing);
+    var timer = Timing.init(io, show_timing);
     try compileWithTimer(allocator, io, input_path, output_path, target_config, &timer, enable_cache);
     timer.printAll();
 }
@@ -752,29 +752,31 @@ const Timing = struct {
     const max_entries = 16;
 
     enabled: bool,
+    io: std.Io,
     names: [max_entries][]const u8,
     durations_ns: [max_entries]u64,
     count: usize,
-    last: ?std.time.Instant,
+    last: ?std.Io.Timestamp,
 
-    fn init(enabled: bool) Timing {
+    fn init(io: std.Io, enabled: bool) Timing {
         return .{
             .enabled = enabled,
+            .io = io,
             .names = undefined,
             .durations_ns = undefined,
             .count = 0,
-            .last = if (enabled) (std.time.Instant.now() catch null) else null,
+            .last = if (enabled) std.Io.Timestamp.now(io, .awake) else null,
         };
     }
 
     fn mark(self: *Timing) void {
-        if (self.enabled) self.last = std.time.Instant.now() catch null;
+        if (self.enabled) self.last = std.Io.Timestamp.now(self.io, .awake);
     }
 
     fn record(self: *Timing, name: []const u8) void {
         if (!self.enabled) return;
-        const now = std.time.Instant.now() catch null;
+        const now = std.Io.Timestamp.now(self.io, .awake);
-        const elapsed_ns: u64 = if (self.last != null and now != null) now.?.since(self.last.?) else 0;
+        const elapsed_ns: u64 = if (self.last) |prev| @intCast(prev.durationTo(now).nanoseconds) else 0;
         if (self.count < max_entries) {
             self.names[self.count] = name;
             self.durations_ns[self.count] = elapsed_ns;