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authorAnthony Ramine <[email protected]>2013-05-06 20:09:39 +0200
committerFredrik Gustafsson <[email protected]>2013-05-28 12:19:34 +0200
commitacb8ef5d18cc3976bf580a8e6925cb5641acd401 (patch)
tree6118529820acda1f779935cde6c03c935f5a6d1e /erts/preloaded/src
parent80c02173c9fc1d76ac1b404a05e2706817a4c308 (diff)
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Fix receive support in erl_eval with a BEAM module
Using the low-level BEAM instructions, we can loop over each message in the process queue and removes the first message that matches, without receiving them all to later send them back to itself. The function prim_eval:'receive'/2 is equivalent to the following pseudo-code: 'receive'(F, T) -> RESET MESSAGE QUEUE POINTER, LOOP: case PEEK CURRENT MESSAGE WITH TIMEOUT T of {ok,Msg} -> case F(Msg) of nomatch -> DECREMENT TIMEOUT T, ADVANCE MESSAGE QUEUE POINTER, GOTO LOOP; Result -> RESET MESSAGE QUEUE POINTER, Result end; timeout -> RESET MESSAGE QUEUE POINTER, timeout end. To not break Dialyzer and other tools, we use a stub Erlang module which abstract code is forcefully inserted into prim_inet.erl afterwards compilation.
Diffstat (limited to 'erts/preloaded/src')
-rw-r--r--erts/preloaded/src/.gitignore1
-rw-r--r--erts/preloaded/src/Makefile26
-rw-r--r--erts/preloaded/src/add_abstract_code34
-rw-r--r--erts/preloaded/src/prim_eval.S70
-rw-r--r--erts/preloaded/src/prim_eval.erl28
5 files changed, 156 insertions, 3 deletions
diff --git a/erts/preloaded/src/.gitignore b/erts/preloaded/src/.gitignore
new file mode 100644
index 0000000000..e4658fe142
--- /dev/null
+++ b/erts/preloaded/src/.gitignore
@@ -0,0 +1 @@
+prim_eval.abstr
diff --git a/erts/preloaded/src/Makefile b/erts/preloaded/src/Makefile
index a224b6a5d4..f53809e765 100644
--- a/erts/preloaded/src/Makefile
+++ b/erts/preloaded/src/Makefile
@@ -32,7 +32,7 @@ STATIC_EBIN=../ebin
include $(ERL_TOP)/erts/vsn.mk
include $(ERL_TOP)/lib/kernel/vsn.mk
-PRE_LOADED_MODULES = \
+PRE_LOADED_ERL_MODULES = \
erl_prim_loader \
init \
prim_file \
@@ -43,10 +43,17 @@ PRE_LOADED_MODULES = \
erlang \
erts_internal
+PRE_LOADED_BEAM_MODULES = \
+ prim_eval
+
+PRE_LOADED_MODULES = $(PRE_LOADED_ERL_MODULES) $(PRE_LOADED_BEAM_MODULES)
+
RELSYSDIR = $(RELEASE_PATH)/lib/erts-$(VSN)
# not $(RELEASE_PATH)/erts-$(VSN)/preloaded
-ERL_FILES= $(PRE_LOADED_MODULES:%=%.erl)
+ERL_FILES= $(PRE_LOADED_ERL_MODULES:%=%.erl)
+BEAM_FILES= $(PRE_LOADED_BEAM_MODULES:%=%.S)
+STUBS_FILES= $(PRE_LOADED_BEAM_MODULES:%=%.erl)
TARGET_FILES = $(PRE_LOADED_MODULES:%=$(EBIN)/%.$(EMULATOR))
STATIC_TARGET_FILES = $(PRE_LOADED_MODULES:%=$(STATIC_EBIN)/%.$(EMULATOR))
@@ -70,7 +77,7 @@ include $(ERL_TOP)/make/otp_release_targets.mk
release_spec:
$(INSTALL_DIR) "$(RELSYSDIR)/src"
- $(INSTALL_DATA) $(ERL_FILES) "$(RELSYSDIR)/src"
+ $(INSTALL_DATA) $(ERL_FILES) $(BEAM_FILES) $(STUBS_FILES) "$(RELSYSDIR)/src"
$(INSTALL_DIR) "$(RELSYSDIR)/ebin"
$(INSTALL_DATA) $(STATIC_TARGET_FILES) "$(RELSYSDIR)/ebin"
@@ -80,6 +87,19 @@ release_docs_spec:
list_preloaded:
@echo $(PRE_LOADED_MODULES)
+#
+# Combine a BEAM assembly script file a stub Erlang file into a BEAM file.
+# See add_abstract_chunk script.
+#
+
+prim_eval.abstr: prim_eval.erl
+ $(V_ERLC) $(ERL_COMPILE_FLAGS) -o$(dir $@) +dabstr $<
+
+prim_eval.beam: prim_eval.S prim_eval.abstr
+ $(gen_verbose)
+ $(V_at)$(ERLC) $(ERL_COMPILE_FLAGS) $<
+ $(V_at)escript add_abstract_code $@ prim_eval.abstr || (rm $@; exit 1)
+
# Include dependencies -- list below added by PaN
$(EBIN)/erl_prim_loader.beam: $(KERNEL_SRC)/inet_boot.hrl $(KERNEL_INCLUDE)/file.hrl
$(EBIN)/prim_file.beam: $(KERNEL_INCLUDE)/file.hrl
diff --git a/erts/preloaded/src/add_abstract_code b/erts/preloaded/src/add_abstract_code
new file mode 100644
index 0000000000..e670156d21
--- /dev/null
+++ b/erts/preloaded/src/add_abstract_code
@@ -0,0 +1,34 @@
+#!/usr/bin/env escript
+%% -*- erlang -*-
+
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2013. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-mode(compile).
+
+-export([main/1]).
+
+main([BeamFile,AbstrFile]) ->
+ {ok,_,Chunks0} = beam_lib:all_chunks(BeamFile),
+ {ok,Abstr} = file:consult(AbstrFile),
+ Chunks = lists:keyreplace("Abst", 1, Chunks0,
+ {"Abst",term_to_binary({raw_abstract_v1,Abstr})}),
+ {ok,Module} = beam_lib:build_module(Chunks),
+ ok = file:write_file(BeamFile, Module),
+ init:stop().
diff --git a/erts/preloaded/src/prim_eval.S b/erts/preloaded/src/prim_eval.S
new file mode 100644
index 0000000000..958a79a1da
--- /dev/null
+++ b/erts/preloaded/src/prim_eval.S
@@ -0,0 +1,70 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2013. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+{module, prim_eval}.
+
+%% This module uses low-level BEAM instructions for the message queue facility
+%% to allow erl_eval to evaluate receive expressions correctly.
+
+{exports, [{'receive',2},{module_info,0},{module_info,1}]}.
+
+{attributes, []}.
+
+{labels, 10}.
+
+
+{function, 'receive', 2, 2}.
+ {label,1}.
+ {func_info,{atom,prim_eval},{atom,'receive'},2}.
+ {label,2}.
+ {allocate,2,2}.
+ {move,{x,1},{y,0}}.
+ {move,{x,0},{y,1}}.
+ {label,3}.
+ {loop_rec,{f,5},{x,0}}.
+ {move,{y,1},{x,1}}.
+ {call_fun,1}.
+ {test,is_ne_exact,{f,4},[{x,0},{atom,nomatch}]}.
+ remove_message.
+ {deallocate,2}.
+ return.
+ {label,4}.
+ {loop_rec_end,{f,3}}.
+ {label,5}.
+ {wait_timeout,{f,3},{y,0}}.
+ timeout.
+ {move,{atom,timeout},{x,0}}.
+ {deallocate,2}.
+ return.
+
+
+{function, module_info, 0, 8}.
+ {label,6}.
+ {func_info,{atom,prim_eval},{atom,module_info},0}.
+ {label,7}.
+ {move,{atom,prim_eval},{x,0}}.
+ {call_ext_only,1,{extfunc,erlang,get_module_info,1}}.
+
+
+{function, module_info, 1, 10}.
+ {label,8}.
+ {func_info,{atom,prim_eval},{atom,module_info},1}.
+ {label,9}.
+ {move,{x,0},{x,1}}.
+ {move,{atom,prim_eval},{x,0}}.
+ {call_ext_only,2,{extfunc,erlang,get_module_info,2}}.
diff --git a/erts/preloaded/src/prim_eval.erl b/erts/preloaded/src/prim_eval.erl
new file mode 100644
index 0000000000..ec5af8c138
--- /dev/null
+++ b/erts/preloaded/src/prim_eval.erl
@@ -0,0 +1,28 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2013. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(prim_eval).
+
+%% This module is simply a stub which abstract code gets included in the result
+%% of compilation of prim_eval.S, to keep Dialyzer happy.
+
+-export(['receive'/2]).
+
+-spec 'receive'(fun((term()) -> nomatch | T), timeout()) -> T.
+'receive'(_, _) ->
+ erlang:nif_error(stub).