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Add ability to stop JIT after N compilations.

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* libguile/jit.c (jit_stop_after, jit_pause_when_stopping): New locals.
  (scm_jit_compute_mcode): Add ability to stop after N compilations.
  (scm_jit_enter_mcode): Comment out printfs for the time being.
  (scm_init_jit): Init locals from environment variables.
This commit is contained in:
Andy Wingo 2018-09-01 11:28:59 +02:00
parent 7c0bfcb097
commit 1f42a6042e
1 changed files with 27 additions and 3 deletions
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30
libguile/jit.c
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@ -126,6 +126,14 @@
GUILE_JIT_COUNTER_THRESHOLD environment variable. */
uint32_t scm_jit_counter_threshold = -1;
/* If positive, stop JIT compilation after the Nth compilation. Useful
for hunting down bugs. */
static int jit_stop_after = -1;
/* If nonzero, pause when stopping JIT compilation after the Nth
compilation. For debugging. */
static int jit_pause_when_stopping = 0;
/* Entry trampoline: saves registers, initializes THREAD and SP
registers, and jumps into mcode. */
static void (*enter_mcode) (scm_thread *thread, const uint8_t *mcode);
@ -4463,7 +4471,21 @@ scm_jit_compute_mcode (scm_thread *thread, struct scm_jit_function_data *data)
if (vcode_start == thread->vm.ip)
{
if (!data->mcode)
compute_mcode (thread, data);
{
compute_mcode (thread, data);
if (--jit_stop_after == 0)
{
scm_jit_counter_threshold = -1;
fprintf (stderr, "stopping automatic JIT compilation, as requested\n");
if (jit_pause_when_stopping)
{
fprintf (stderr, "sleeping for 30s; to debug:\n");
fprintf (stderr, " gdb -p %d\n\n", getpid ());
sleep (30);
}
}
}
return data->mcode;
}
@ -4474,9 +4496,9 @@ scm_jit_compute_mcode (scm_thread *thread, struct scm_jit_function_data *data)
void
scm_jit_enter_mcode (scm_thread *thread, const uint8_t *mcode)
{
fprintf (stderr, "entering mcode: %p\n", mcode);
// fprintf (stderr, "entering mcode: %p\n", mcode);
enter_mcode (thread, mcode);
fprintf (stderr, "exited mcode\n");
// fprintf (stderr, "exited mcode\n");
}
void
@ -4493,5 +4515,7 @@ void
scm_init_jit (void)
{
scm_jit_counter_threshold = scm_getenv_int ("GUILE_JIT_COUNTER_THRESHOLD", -1);
jit_stop_after = scm_getenv_int ("GUILE_JIT_STOP_AFTER", -1);
jit_pause_when_stopping = scm_getenv_int ("GUILE_JIT_PAUSE_WHEN_STOPPING", 0);
scm_c_define_gsubr ("%jit-compile", 1, 0, 0, (scm_t_subr) scm_sys_jit_compile);
}