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authorBjörn Gustavsson <[email protected]>2017-05-20 17:59:03 +0200
committerBjörn Gustavsson <[email protected]>2017-08-11 13:44:47 +0200
commit81a6adab693a75f89bc87911ac23a21308673d2d (patch)
treef0fcf793984c34b69a9c2f111c42d25e87605f34 /erts/emulator/beam/msg_instrs.tab
parente1be82aba88fd01926bcfc88757ae3257eadaf16 (diff)
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Break out most instructions from beam_emu.c
Diffstat (limited to 'erts/emulator/beam/msg_instrs.tab')
-rw-r--r--erts/emulator/beam/msg_instrs.tab382
1 files changed, 382 insertions, 0 deletions
diff --git a/erts/emulator/beam/msg_instrs.tab b/erts/emulator/beam/msg_instrs.tab
new file mode 100644
index 0000000000..509143268b
--- /dev/null
+++ b/erts/emulator/beam/msg_instrs.tab
@@ -0,0 +1,382 @@
+// -*- c -*-
+//
+// %CopyrightBegin%
+//
+// Copyright Ericsson AB 2017. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// %CopyrightEnd%
+//
+
+// /*
+// * Skeleton for receive statement:
+// *
+// * recv_mark L1 Optional
+// * call make_ref/monitor Optional
+// * ...
+// * recv_set L1 Optional
+// * L1: <-------------------+
+// * <-----------+ |
+// * | |
+// * loop_rec L2 ------+---+ |
+// * ... | | |
+// * remove_message | | |
+// * jump L3 | | |
+// * ... | | |
+// * loop_rec_end L1 --+ | |
+// * L2: <---------------+ |
+// * wait L1 -------------------+ or wait_timeout
+// * timeout
+// *
+// * L3: Code after receive...
+// *
+// */
+
+recv_mark(Dest) {
+ /*
+ * Save the current position in message buffer and the
+ * the label for the loop_rec/2 instruction for the
+ * the receive statement.
+ */
+ c_p->msg.mark = (BeamInstr *) $Dest;
+ c_p->msg.saved_last = c_p->msg.last;
+}
+
+i_recv_set() {
+ /*
+ * If the mark is valid (points to the loop_rec/2
+ * instruction that follows), we know that the saved
+ * position points to the first message that could
+ * possibly be matched out.
+ *
+ * If the mark is invalid, we do nothing, meaning that
+ * we will look through all messages in the message queue.
+ */
+ if (c_p->msg.mark == (BeamInstr *) ($NEXT_INSTRUCTION)) {
+ c_p->msg.save = c_p->msg.saved_last;
+ }
+ /* Fall through to the loop_rec/2 instruction */
+}
+
+i_loop_rec(Dest) {
+ //| -no_prefetch
+
+ /*
+ * Pick up the next message and place it in x(0).
+ * If no message, jump to a wait or wait_timeout instruction.
+ */
+
+ ErtsMessage* msgp;
+
+ /*
+ * We need to disable GC while matching messages
+ * in the queue. This since messages with data outside
+ * the heap will be corrupted by a GC.
+ */
+ ASSERT(!(c_p->flags & F_DELAY_GC));
+ c_p->flags |= F_DELAY_GC;
+
+loop_rec__:
+
+ PROCESS_MAIN_CHK_LOCKS(c_p);
+
+ msgp = PEEK_MESSAGE(c_p);
+
+ if (!msgp) {
+ erts_proc_lock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ /* Make sure messages wont pass exit signals... */
+ if (ERTS_PROC_PENDING_EXIT(c_p)) {
+ erts_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ SWAPOUT;
+ c_p->flags &= ~F_DELAY_GC;
+ c_p->arity = 0;
+ goto do_schedule; /* Will be rescheduled for exit */
+ }
+ ERTS_MSGQ_MV_INQ2PRIVQ(c_p);
+ msgp = PEEK_MESSAGE(c_p);
+ if (msgp) {
+ erts_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ } else {
+ c_p->flags &= ~F_DELAY_GC;
+ SET_I((BeamInstr *) $Dest);
+ Goto(*I); /* Jump to a wait or wait_timeout instruction */
+ }
+ }
+ if (is_non_value(ERL_MESSAGE_TERM(msgp))) {
+ SWAPOUT; /* erts_decode_dist_message() may write to heap... */
+ if (!erts_decode_dist_message(c_p, ERTS_PROC_LOCK_MAIN, msgp, 0)) {
+ /*
+ * A corrupt distribution message that we weren't able to decode;
+ * remove it...
+ */
+ /* No swapin should be needed */
+ ASSERT(HTOP == c_p->htop && E == c_p->stop);
+ /* TODO: Add DTrace probe for this bad message situation? */
+ UNLINK_MESSAGE(c_p, msgp);
+ msgp->next = NULL;
+ erts_cleanup_messages(msgp);
+ goto loop_rec__;
+ }
+ SWAPIN;
+ }
+ r(0) = ERL_MESSAGE_TERM(msgp);
+}
+
+remove_message() {
+ //| -no_prefetch
+
+ /*
+ * Remove a (matched) message from the message queue.
+ */
+
+ ErtsMessage* msgp;
+ PROCESS_MAIN_CHK_LOCKS(c_p);
+
+ ERTS_CHK_MBUF_SZ(c_p);
+
+ msgp = PEEK_MESSAGE(c_p);
+
+ if (ERTS_PROC_GET_SAVED_CALLS_BUF(c_p)) {
+ save_calls(c_p, &exp_receive);
+ }
+ if (ERL_MESSAGE_TOKEN(msgp) == NIL) {
+#ifdef USE_VM_PROBES
+ if (DT_UTAG(c_p) != NIL) {
+ if (DT_UTAG_FLAGS(c_p) & DT_UTAG_PERMANENT) {
+ SEQ_TRACE_TOKEN(c_p) = am_have_dt_utag;
+ } else {
+ DT_UTAG(c_p) = NIL;
+ SEQ_TRACE_TOKEN(c_p) = NIL;
+ }
+ } else {
+#endif
+ SEQ_TRACE_TOKEN(c_p) = NIL;
+#ifdef USE_VM_PROBES
+ }
+ DT_UTAG_FLAGS(c_p) &= ~DT_UTAG_SPREADING;
+#endif
+ } else if (ERL_MESSAGE_TOKEN(msgp) != am_undefined) {
+ Eterm msg;
+ SEQ_TRACE_TOKEN(c_p) = ERL_MESSAGE_TOKEN(msgp);
+#ifdef USE_VM_PROBES
+ if (ERL_MESSAGE_TOKEN(msgp) == am_have_dt_utag) {
+ if (DT_UTAG(c_p) == NIL) {
+ DT_UTAG(c_p) = ERL_MESSAGE_DT_UTAG(msgp);
+ }
+ DT_UTAG_FLAGS(c_p) |= DT_UTAG_SPREADING;
+ } else {
+#endif
+ ASSERT(is_tuple(SEQ_TRACE_TOKEN(c_p)));
+ ASSERT(SEQ_TRACE_TOKEN_ARITY(c_p) == 5);
+ ASSERT(is_small(SEQ_TRACE_TOKEN_SERIAL(c_p)));
+ ASSERT(is_small(SEQ_TRACE_TOKEN_LASTCNT(c_p)));
+ ASSERT(is_small(SEQ_TRACE_TOKEN_FLAGS(c_p)));
+ ASSERT(is_pid(SEQ_TRACE_TOKEN_SENDER(c_p)));
+ c_p->seq_trace_lastcnt = unsigned_val(SEQ_TRACE_TOKEN_SERIAL(c_p));
+ if (c_p->seq_trace_clock < unsigned_val(SEQ_TRACE_TOKEN_SERIAL(c_p))) {
+ c_p->seq_trace_clock = unsigned_val(SEQ_TRACE_TOKEN_SERIAL(c_p));
+ }
+ msg = ERL_MESSAGE_TERM(msgp);
+ seq_trace_output(SEQ_TRACE_TOKEN(c_p), msg, SEQ_TRACE_RECEIVE,
+ c_p->common.id, c_p);
+#ifdef USE_VM_PROBES
+ }
+#endif
+ }
+#ifdef USE_VM_PROBES
+ if (DTRACE_ENABLED(message_receive)) {
+ Eterm token2 = NIL;
+ DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
+ Sint tok_label = 0;
+ Sint tok_lastcnt = 0;
+ Sint tok_serial = 0;
+
+ dtrace_proc_str(c_p, receiver_name);
+ token2 = SEQ_TRACE_TOKEN(c_p);
+ if (have_seqtrace(token2)) {
+ tok_label = signed_val(SEQ_TRACE_T_LABEL(token2));
+ tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(token2));
+ tok_serial = signed_val(SEQ_TRACE_T_SERIAL(token2));
+ }
+ DTRACE6(message_receive,
+ receiver_name, size_object(ERL_MESSAGE_TERM(msgp)),
+ c_p->msg.len - 1, tok_label, tok_lastcnt, tok_serial);
+ }
+#endif
+ UNLINK_MESSAGE(c_p, msgp);
+ JOIN_MESSAGE(c_p);
+ CANCEL_TIMER(c_p);
+
+ erts_save_message_in_proc(c_p, msgp);
+ c_p->flags &= ~F_DELAY_GC;
+
+ if (ERTS_IS_GC_DESIRED_INTERNAL(c_p, HTOP, E)) {
+ /*
+ * We want to GC soon but we leave a few
+ * reductions giving the message some time
+ * to turn into garbage.
+ */
+ ERTS_VBUMP_LEAVE_REDS_INTERNAL(c_p, 5, FCALLS);
+ }
+
+ ERTS_DBG_CHK_REDS(c_p, FCALLS);
+ ERTS_CHK_MBUF_SZ(c_p);
+
+ ERTS_VERIFY_UNUSED_TEMP_ALLOC(c_p);
+ PROCESS_MAIN_CHK_LOCKS(c_p);
+}
+
+loop_rec_end(Dest) {
+ //| -no_next
+ /*
+ * Advance the save pointer to the next message (the current
+ * message didn't match), then jump to the loop_rec instruction.
+ */
+
+ ASSERT(c_p->flags & F_DELAY_GC);
+
+ SET_I((BeamInstr *) $Dest);
+ SAVE_MESSAGE(c_p);
+ if (FCALLS > 0 || FCALLS > neg_o_reds) {
+ FCALLS--;
+ goto loop_rec__;
+ }
+
+ c_p->flags &= ~F_DELAY_GC;
+ c_p->i = I;
+ SWAPOUT;
+ c_p->arity = 0;
+ c_p->current = NULL;
+ goto do_schedule;
+}
+
+timeout_locked() {
+ /*
+ * A timeout has occurred. Reset the save pointer so that the next
+ * receive statement will examine the first message first.
+ */
+
+ erts_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ $timeout();
+}
+
+timeout() {
+ if (IS_TRACED_FL(c_p, F_TRACE_RECEIVE)) {
+ trace_receive(c_p, am_clock_service, am_timeout, NULL);
+ }
+ if (ERTS_PROC_GET_SAVED_CALLS_BUF(c_p)) {
+ save_calls(c_p, &exp_timeout);
+ }
+ c_p->flags &= ~F_TIMO;
+ JOIN_MESSAGE(c_p);
+}
+
+TIMEOUT_VALUE() {
+ c_p->freason = EXC_TIMEOUT_VALUE;
+ goto find_func_info;
+}
+
+i_wait_error_locked() {
+ erts_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ $TIMEOUT_VALUE();
+}
+
+i_wait_error() {
+ $TIMEOUT_VALUE();
+}
+
+wait_timeout_unlocked_int := wait.lock.int.execute;
+wait_timeout_locked_int := wait.int.execute;
+
+wait_timeout_unlocked := wait.lock.src.execute;
+wait_timeout_locked := wait.src.execute;
+
+wait_unlocked := wait.lock.execute;
+wait_locked := wait.unlocked.execute;
+
+wait.lock() {
+ erts_proc_lock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+}
+
+wait.unlocked() {
+}
+
+wait.int(Int) {
+ /*
+ * If we have already set the timer, we must NOT set it again. Therefore,
+ * we must test the F_INSLPQUEUE flag as well as the F_TIMO flag.
+ */
+ if ((c_p->flags & (F_INSLPQUEUE | F_TIMO)) == 0) {
+ BeamInstr** pi = (BeamInstr **) c_p->def_arg_reg;
+ *pi = $NEXT_INSTRUCTION;
+ erts_set_proc_timer_uword(c_p, $Int);
+ }
+}
+
+wait.src(Src) {
+ /*
+ * If we have already set the timer, we must NOT set it again. Therefore,
+ * we must test the F_INSLPQUEUE flag as well as the F_TIMO flag.
+ */
+ if ((c_p->flags & (F_INSLPQUEUE | F_TIMO)) == 0) {
+ Eterm timeout_value = $Src;
+ if (timeout_value == make_small(0)) {
+ erts_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ $NEXT0();
+ } else if (timeout_value == am_infinity) {
+ c_p->flags |= F_TIMO;
+ } else {
+ int tres = erts_set_proc_timer_term(c_p, timeout_value);
+ if (tres == 0) {
+ /*
+ * The timer routiner will set c_p->i to the value in
+ * c_p->def_arg_reg[0]. Note that it is safe to use this
+ * location because there are no living x registers in
+ * a receive statement.
+ */
+ BeamInstr** pi = (BeamInstr**) c_p->def_arg_reg;
+ *pi = $NEXT_INSTRUCTION;
+ } else { /* Wrong time */
+ erts_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ c_p->freason = EXC_TIMEOUT_VALUE;
+ goto find_func_info;
+ }
+ }
+ }
+}
+
+//
+// Prepare to wait indefinitely for a new message to arrive
+// (or the time set above if falling through from above).
+// When a new message arrives, control will be transferred
+// the loop_rec instruction (at label L1). In case of
+// of timeout, control will be transferred to the timeout
+// instruction following the wait_timeout instruction.
+//
+
+wait.execute(JumpTarget) {
+ c_p->i = (BeamInstr *) $JumpTarget; /* L1 */
+ SWAPOUT;
+ c_p->arity = 0;
+
+ if (!ERTS_PTMR_IS_TIMED_OUT(c_p)) {
+ erts_atomic32_read_band_relb(&c_p->state,
+ ~ERTS_PSFLG_ACTIVE);
+ }
+ ASSERT(!ERTS_PROC_IS_EXITING(c_p));
+ erts_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE);
+ c_p->current = NULL;
+ goto do_schedule;
+ //| -no_next
+}