/* Called to start OSR. Switches us over to logging runs of spesh'd code, to
* collect extra type info. */
void MVM_spesh_osr(MVMThreadContext *tc) {
MVMSpeshCandidate *specialized;
MVMint32 osr_index;
/* Check OSR is enabled. */
if (!tc->instance->spesh_osr_enabled)
return;
/* Ensure that we are in a position to specialize. */
if (!tc->cur_frame->caller)
return;
if (!tc->cur_frame->params.callsite->is_interned)
return;
if (tc->cur_frame->static_info->body.num_spesh_candidates == MVM_SPESH_LIMIT)
return;
/* Produce logging spesh candidate. */
specialized = MVM_spesh_candidate_setup(tc, tc->cur_frame->static_info,
tc->cur_frame->params.callsite, tc->cur_frame->params.args, 1);
if (specialized) {
/* Set up frame to point to specialized logging code. */
tc->cur_frame->effective_bytecode = specialized->bytecode;
tc->cur_frame->effective_handlers = specialized->handlers;
tc->cur_frame->effective_spesh_slots = specialized->spesh_slots;
tc->cur_frame->spesh_log_slots = specialized->log_slots;
tc->cur_frame->spesh_cand = specialized;
tc->cur_frame->spesh_log_idx = 0;
specialized->log_enter_idx = 1;
/* Work out deopt index that applies, and move interpreter into the
* logging version of the code. */
osr_index = get_osr_deopt_index(tc, specialized);
*(tc->interp_bytecode_start) = specialized->bytecode;
*(tc->interp_cur_op) = specialized->bytecode +
specialized->deopts[2 * osr_index + 1] +
2; /* Pass over sp_osrfianlize this first time */;
}
}
/* Does the jump into the optimized code. */
void perform_osr(MVMThreadContext *tc, MVMSpeshCandidate *specialized) {
MVMJitCode *jit_code;
MVMint32 num_locals;
/* Work out the OSR deopt index, to locate the entry point. */
MVMint32 osr_index = get_osr_deopt_index(tc, specialized);
#if MVM_LOG_OSR
fprintf(stderr, "Performing OSR of frame '%s' (cuid: %s) at index %d\n",
MVM_string_utf8_encode_C_string(tc, tc->cur_frame->static_info->body.name),
MVM_string_utf8_encode_C_string(tc, tc->cur_frame->static_info->body.cuuid),
osr_index);
#endif
jit_code = specialized->jitcode;
num_locals = jit_code && jit_code->local_types ?
jit_code->num_locals : specialized->num_locals;
/* Resize work area if needed. */
if (specialized->work_size > tc->cur_frame->allocd_work) {
/* Resize work area. */
MVMRegister *new_work = MVM_fixed_size_alloc_zeroed(tc, tc->instance->fsa,
specialized->work_size);
MVMRegister *new_args = new_work + num_locals;
memcpy(new_work, tc->cur_frame->work,
tc->cur_frame->static_info->body.num_locals * sizeof(MVMRegister));
memcpy(new_args, tc->cur_frame->args,
tc->cur_frame->static_info->body.cu->body.max_callsite_size * sizeof(MVMRegister));
MVM_fixed_size_free(tc, tc->instance->fsa, tc->cur_frame->allocd_work,
tc->cur_frame->work);
tc->cur_frame->work = new_work;
tc->cur_frame->allocd_work = specialized->work_size;
tc->cur_frame->args = new_args;
#if MVM_LOG_OSR
fprintf(stderr, "OSR resized work area of frame '%s' (cuid: %s)\n",
MVM_string_utf8_encode_C_string(tc, tc->cur_frame->static_info->body.name),
MVM_string_utf8_encode_C_string(tc, tc->cur_frame->static_info->body.cuuid));
#endif
}
else if (specialized->work_size > tc->cur_frame->static_info->body.work_size) {
size_t keep_bytes = tc->cur_frame->static_info->body.num_locals * sizeof(MVMRegister);
size_t to_null = specialized->work_size - keep_bytes;
memset((char *)tc->cur_frame->work + keep_bytes, 0, to_null);
}
/* Resize environment if needed. */
if (specialized->num_lexicals > tc->cur_frame->static_info->body.num_lexicals) {
MVMRegister *new_env = MVM_fixed_size_alloc_zeroed(tc, tc->instance->fsa,
specialized->env_size);
if (tc->cur_frame->allocd_env) {
memcpy(new_env, tc->cur_frame->env,
tc->cur_frame->static_info->body.num_lexicals * sizeof(MVMRegister));
MVM_fixed_size_free(tc, tc->instance->fsa, tc->cur_frame->allocd_env,
tc->cur_frame->env);
}
tc->cur_frame->env = new_env;
tc->cur_frame->allocd_env = specialized->env_size;
#if MVM_LOG_OSR
fprintf(stderr, "OSR resized environment of frame '%s' (cuid: %s)\n",
MVM_string_utf8_encode_C_string(tc, tc->cur_frame->static_info->body.name),
MVM_string_utf8_encode_C_string(tc, tc->cur_frame->static_info->body.cuuid));
#endif
}
else if (specialized->env_size > tc->cur_frame->static_info->body.env_size) {
size_t keep_bytes = tc->cur_frame->static_info->body.num_lexicals * sizeof(MVMRegister);
size_t to_null = specialized->env_size - keep_bytes;
memset((char *)tc->cur_frame->env + keep_bytes, 0, to_null);
}
/* Set up frame to point to spesh candidate/slots. */
tc->cur_frame->effective_spesh_slots = specialized->spesh_slots;
tc->cur_frame->spesh_cand = specialized;
/* Move into the optimized (and maybe JIT-compiled) code. */
if (jit_code && jit_code->num_deopts) {
MVMint32 i;
*(tc->interp_bytecode_start) = jit_code->bytecode;
*(tc->interp_cur_op) = jit_code->bytecode;
for (i = 0; i < jit_code->num_deopts; i++) {
if (jit_code->deopts[i].idx == osr_index) {
tc->cur_frame->jit_entry_label = jit_code->labels[jit_code->deopts[i].label];
break;
}
}
if (i == jit_code->num_deopts)
MVM_oops(tc, "JIT: Could not find OSR label");
if (tc->instance->profiling)
MVM_profiler_log_osr(tc, 1);
} else {
*(tc->interp_bytecode_start) = specialized->bytecode;
*(tc->interp_cur_op) = specialized->bytecode +
specialized->deopts[2 * osr_index + 1];
if (tc->instance->profiling)
MVM_profiler_log_osr(tc, 0);
}
*(tc->interp_reg_base) = tc->cur_frame->work;
}
