Remove try from at-time and close compile timer during throw (#39133)

* remove try from at-time and close compile timer during throw

* add scope tests for at-time and aat-timev

Author: IanButterworth

base/timing.jl

@@ -203,12 +203,9 @@ macro time(ex)
         local stats = gc_num()
         local compile_elapsedtime = cumulative_compile_time_ns_before()
         local elapsedtime = time_ns()
-        local val = try
-            $(esc(ex))
-        finally
-            elapsedtime = time_ns() - elapsedtime
-            compile_elapsedtime = cumulative_compile_time_ns_after() - compile_elapsedtime
-        end
+        local val = $(esc(ex))
+        elapsedtime = time_ns() - elapsedtime
+        compile_elapsedtime = cumulative_compile_time_ns_after() - compile_elapsedtime
         local diff = GC_Diff(gc_num(), stats)
         time_print(elapsedtime, diff.allocd, diff.total_time, gc_alloc_count(diff), compile_elapsedtime, true)
         val
@@ -252,12 +249,9 @@ macro timev(ex)
         local stats = gc_num()
         local compile_elapsedtime = cumulative_compile_time_ns_before()
         local elapsedtime = time_ns()
-        local val = try
-            $(esc(ex))
-        finally
-            elapsedtime = time_ns() - elapsedtime
-            compile_elapsedtime = cumulative_compile_time_ns_after() - compile_elapsedtime
-        end
+        local val = $(esc(ex))
+        elapsedtime = time_ns() - elapsedtime
+        compile_elapsedtime = cumulative_compile_time_ns_after() - compile_elapsedtime
         local diff = GC_Diff(gc_num(), stats)
         timev_print(elapsedtime, diff, compile_elapsedtime)
         val

src/task.c

@@ -584,6 +584,9 @@ static void JL_NORETURN throw_internal(jl_value_t *exception JL_MAYBE_UNROOTED)
 {
     jl_ptls_t ptls = jl_get_ptls_states();
     ptls->io_wait = 0;
+    // @time needs its compile timer disabled on error,
+    // and cannot use a try-finally as it would break scope for assignments
+    jl_measure_compile_time[ptls->tid] = 0;
     if (ptls->safe_restore)
         jl_longjmp(*ptls->safe_restore, 1);
     // During startup

test/core.jl

@@ -5080,6 +5080,19 @@ end
 @test f17255(10000)[1]
 GC.enable(true)
 
+# PR #39133, ensure that @time evaluates in the same scope
+function time_macro_scope()
+    @time time_macro_local_var = 1
+    time_macro_local_var
+end
+@test time_macro_scope() == 1
+
+function timev_macro_scope()
+    @timev timev_macro_local_var = 1
+    timev_macro_local_var
+end
+@time timev_macro_scope() == 1
+
 # issue #18710
 bad_tvars() where {T} = 1
 @test isa(which(bad_tvars, ()), Method)