%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2001-2015. 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(cover).
%%
%% This module implements the Erlang coverage tool. The module named
%% cover_web implements a user interface for the coverage tool to run
%% under webtool.
%%
%% ARCHITECTURE
%% The coverage tool consists of one process on each node involved in
%% coverage analysis. The process is registered as 'cover_server'
%% (?SERVER). The cover_server on the 'main' node is in charge, and
%% it monitors the cover_servers on all remote nodes. When it gets a
%% 'DOWN' message for another cover_server, it marks the node as
%% 'lost'. If a nodeup is received for a lost node the main node
%% ensures that the cover compiled modules are loaded again. If the
%% remote node was alive during the disconnected periode, cover data
%% for this periode will also be included in the analysis.
%%
%% The cover_server process on the main node is implemented by the
%% functions init_main/1 and main_process_loop/1. The cover_server on
%% the remote nodes are implemented by the functions init_remote/2 and
%% remote_process_loop/1.
%%
%% TABLES
%% Each nodes has two tables: cover_internal_data_table (?COVER_TABLE) and.
%% cover_internal_clause_table (?COVER_CLAUSE_TABLE).
%% ?COVER_TABLE contains the bump data i.e. the data about which lines
%% have been executed how many times.
%% ?COVER_CLAUSE_TABLE contains information about which clauses in which modules
%% cover is currently collecting statistics.
%%
%% The main node owns tables named
%% 'cover_collected_remote_data_table' (?COLLECTION_TABLE) and
%% 'cover_collected_remote_clause_table' (?COLLECTION_CLAUSE_TABLE).
%% These tables contain data which is collected from remote nodes (either when a
%% remote node is stopped with cover:stop/1 or when analysing). When
%% analysing, data is even moved from the COVER tables on the main
%% node to the COLLECTION tables.
%%
%% The main node also has a table named 'cover_binary_code_table'
%% (?BINARY_TABLE). This table contains the binary code for each cover
%% compiled module. This is necessary so that the code can be loaded
%% on remote nodes that are started after the compilation.
%%
%% PARALLELISM
%% To take advantage of SMP when doing the cover analysis both the data
%% collection and analysis has been parallelized. One process is spawned for
%% each node when collecting data, and on the remote node when collecting data
%% one process is spawned per module.
%%
%% When analyzing data it is possible to issue multiple analyse(_to_file)/X
%% calls at once. They are however all calls (for backwards compatibility
%% reasons) so the user of cover will have to spawn several processes to to the
%% calls ( or use async_analyse_to_file ).
%%
%% External exports
-export([start/0, start/1,
compile/1, compile/2, compile_module/1, compile_module/2,
compile_directory/0, compile_directory/1, compile_directory/2,
compile_beam/1, compile_beam_directory/0, compile_beam_directory/1,
analyse/0, analyse/1, analyse/2, analyse/3,
analyze/0, analyze/1, analyze/2, analyze/3,
analyse_to_file/0,
analyse_to_file/1, analyse_to_file/2, analyse_to_file/3,
analyze_to_file/0,
analyze_to_file/1, analyze_to_file/2, analyze_to_file/3,
async_analyse_to_file/1,async_analyse_to_file/2,
async_analyse_to_file/3, async_analyze_to_file/1,
async_analyze_to_file/2, async_analyze_to_file/3,
export/1, export/2, import/1,
modules/0, imported/0, imported_modules/0, which_nodes/0, is_compiled/1,
reset/1, reset/0,
flush/1,
stop/0, stop/1]).
-export([remote_start/1,get_main_node/0]).
%% Used internally to ensure we upgrade the code to the latest version.
-export([main_process_loop/1,remote_process_loop/1]).
-record(main_state, {compiled=[], % [{Module,File}]
imported=[], % [{Module,File,ImportFile}]
stopper, % undefined | pid()
nodes=[], % [Node]
lost_nodes=[]}). % [Node]
-record(remote_state, {compiled=[], % [{Module,File}]
main_node}). % atom()
-record(bump, {module = '_', % atom()
function = '_', % atom()
arity = '_', % integer()
clause = '_', % integer()
line = '_' % integer()
}).
-define(BUMP_REC_NAME,bump).
-define(CHUNK_SIZE, 20000).
-record(vars, {module, % atom() Module name
init_info=[], % [{M,F,A,C,L}]
function, % atom()
arity, % int()
clause, % int()
lines, % [int()]
no_bump_lines, % [int()]
depth, % int()
is_guard=false % boolean
}).
-define(COVER_TABLE, 'cover_internal_data_table').
-define(COVER_CLAUSE_TABLE, 'cover_internal_clause_table').
-define(BINARY_TABLE, 'cover_binary_code_table').
-define(COLLECTION_TABLE, 'cover_collected_remote_data_table').
-define(COLLECTION_CLAUSE_TABLE, 'cover_collected_remote_clause_table').
-define(TAG, cover_compiled).
-define(SERVER, cover_server).
%% Line doesn't matter.
-define(BLOCK(Expr), {block,erl_anno:new(0),[Expr]}).
-define(BLOCK1(Expr),
if
element(1, Expr) =:= block ->
Expr;
true -> ?BLOCK(Expr)
end).
-define(SPAWN_DBG(Tag,Value),put(Tag,Value)).
-include_lib("stdlib/include/ms_transform.hrl").
%%%----------------------------------------------------------------------
%%% External exports
%%%----------------------------------------------------------------------
%% start() -> {ok,Pid} | {error,Reason}
%% Pid = pid()
%% Reason = {already_started,Pid} | term()
start() ->
case whereis(?SERVER) of
undefined ->
Starter = self(),
Pid = spawn(fun() ->
?SPAWN_DBG(start,[]),
init_main(Starter)
end),
Ref = erlang:monitor(process,Pid),
Return =
receive
{?SERVER,started} ->
{ok,Pid};
{'DOWN', Ref, _Type, _Object, Info} ->
{error,Info}
end,
erlang:demonitor(Ref),
Return;
Pid ->
{error,{already_started,Pid}}
end.
%% start(Nodes) -> {ok,StartedNodes}
%% Nodes = Node | [Node,...]
%% Node = atom()
start(Node) when is_atom(Node) ->
start([Node]);
start(Nodes) ->
call({start_nodes,remove_myself(Nodes,[])}).
%% compile(ModFiles) ->
%% compile(ModFiles, Options) ->
%% compile_module(ModFiles) -> Result
%% compile_module(ModFiles, Options) -> Result
%% ModFiles = ModFile | [ModFile]
%% ModFile = Module | File
%% Module = atom()
%% File = string()
%% Options = [Option]
%% Option = {i,Dir} | {d,Macro} | {d,Macro,Value}
%% Result = {ok,Module} | {error,File}
compile(ModFile) ->
compile_module(ModFile, []).
compile(ModFile, Options) ->
compile_module(ModFile, Options).
compile_module(ModFile) when is_atom(ModFile);
is_list(ModFile) ->
compile_module(ModFile, []).
compile_module(ModFile, Options) when is_atom(ModFile);
is_list(ModFile), is_integer(hd(ModFile)) ->
[R] = compile_module([ModFile], Options),
R;
compile_module(ModFiles, Options) when is_list(Options) ->
AbsFiles =
[begin
File =
case ModFile of
_ when is_atom(ModFile) -> atom_to_list(ModFile);
_ when is_list(ModFile) -> ModFile
end,
WithExt = case filename:extension(File) of
".erl" ->
File;
_ ->
File++".erl"
end,
filename:absname(WithExt)
end || ModFile <- ModFiles],
compile_modules(AbsFiles, Options).
%% compile_directory() ->
%% compile_directory(Dir) ->
%% compile_directory(Dir, Options) -> [Result] | {error,Reason}
%% Dir = string()
%% Options - see compile/1
%% Result - see compile/1
%% Reason = eacces | enoent
compile_directory() ->
case file:get_cwd() of
{ok, Dir} ->
compile_directory(Dir, []);
Error ->
Error
end.
compile_directory(Dir) when is_list(Dir) ->
compile_directory(Dir, []).
compile_directory(Dir, Options) when is_list(Dir), is_list(Options) ->
case file:list_dir(Dir) of
{ok, Files} ->
ErlFiles = [filename:join(Dir, File) ||
File <- Files,
filename:extension(File) =:= ".erl"],
compile_modules(ErlFiles, Options);
Error ->
Error
end.
compile_modules(Files,Options) ->
Options2 = filter_options(Options),
%% compile_modules(Files,Options2,[]).
call({compile, Files, Options2}).
%% compile_modules([File|Files], Options, Result) ->
%% R = call({compile, File, Options}),
%% compile_modules(Files,Options,[R|Result]);
%% compile_modules([],_Opts,Result) ->
%% lists:reverse(Result).
filter_options(Options) ->
lists:filter(fun(Option) ->
case Option of
{i, Dir} when is_list(Dir) -> true;
{d, _Macro} -> true;
{d, _Macro, _Value} -> true;
export_all -> true;
_ -> false
end
end,
Options).
%% compile_beam(ModFile) -> Result | {error,Reason}
%% ModFile - see compile/1
%% Result - see compile/1
%% Reason = non_existing | already_cover_compiled
compile_beam(ModFile0) when is_atom(ModFile0);
is_list(ModFile0), is_integer(hd(ModFile0)) ->
case compile_beams([ModFile0]) of
[{error,{non_existing,_}}] ->
%% Backwards compatibility
{error,non_existing};
[Result] ->
Result
end;
compile_beam(ModFiles) when is_list(ModFiles) ->
compile_beams(ModFiles).
%% compile_beam_directory(Dir) -> [Result] | {error,Reason}
%% Dir - see compile_directory/1
%% Result - see compile/1
%% Reason = eacces | enoent
compile_beam_directory() ->
case file:get_cwd() of
{ok, Dir} ->
compile_beam_directory(Dir);
Error ->
Error
end.
compile_beam_directory(Dir) when is_list(Dir) ->
case file:list_dir(Dir) of
{ok, Files} ->
BeamFiles = [filename:join(Dir, File) ||
File <- Files,
filename:extension(File) =:= ".beam"],
compile_beams(BeamFiles);
Error ->
Error
end.
compile_beams(ModFiles0) ->
ModFiles = get_mods_and_beams(ModFiles0,[]),
call({compile_beams,ModFiles}).
get_mods_and_beams([Module|ModFiles],Acc) when is_atom(Module) ->
case code:which(Module) of
non_existing ->
get_mods_and_beams(ModFiles,[{error,{non_existing,Module}}|Acc]);
File ->
get_mods_and_beams([{Module,File}|ModFiles],Acc)
end;
get_mods_and_beams([File|ModFiles],Acc) when is_list(File) ->
{WithExt,WithoutExt}
= case filename:rootname(File,".beam") of
File ->
{File++".beam",File};
Rootname ->
{File,Rootname}
end,
AbsFile = filename:absname(WithExt),
Module = list_to_atom(filename:basename(WithoutExt)),
get_mods_and_beams([{Module,AbsFile}|ModFiles],Acc);
get_mods_and_beams([{Module,File}|ModFiles],Acc) ->
%% Check for duplicates
case lists:keyfind(Module,2,Acc) of
{ok,Module,File} ->
%% Duplicate, but same file so ignore
get_mods_and_beams(ModFiles,Acc);
{ok,Module,_OtherFile} ->
%% Duplicate and differnet file - error
get_mods_and_beams(ModFiles,[{error,{duplicate,Module}}|Acc]);
_ ->
get_mods_and_beams(ModFiles,[{ok,Module,File}|Acc])
end;
get_mods_and_beams([],Acc) ->
lists:reverse(Acc).
%% analyse(Modules) ->
%% analyse(Analysis) ->
%% analyse(Level) ->
%% analyse(Modules, Analysis) ->
%% analyse(Modules, Level) ->
%% analyse(Analysis, Level)
%% analyse(Modules, Analysis, Level) -> {ok,Answer} | {error,Error}
%% Modules = Module | [Module]
%% Module = atom()
%% Analysis = coverage | calls
%% Level = line | clause | function | module
%% Answer = {Module,Value} | [{Item,Value}]
%% Item = Line | Clause | Function
%% Line = {M,N}
%% Clause = {M,F,A,C}
%% Function = {M,F,A}
%% M = F = atom()
%% N = A = C = integer()
%% Value = {Cov,NotCov} | Calls
%% Cov = NotCov = Calls = integer()
%% Error = {not_cover_compiled,Module} | not_main_node
-define(is_analysis(__A__),
(__A__=:=coverage orelse __A__=:=calls)).
-define(is_level(__L__),
(__L__=:=line orelse __L__=:=clause orelse
__L__=:=function orelse __L__=:=module)).
analyse() ->
analyse('_').
analyse(Analysis) when ?is_analysis(Analysis) ->
analyse('_', Analysis);
analyse(Level) when ?is_level(Level) ->
analyse('_', Level);
analyse(Module) ->
analyse(Module, coverage).
analyse(Analysis, Level) when ?is_analysis(Analysis) andalso
?is_level(Level) ->
analyse('_', Analysis, Level);
analyse(Module, Analysis) when ?is_analysis(Analysis) ->
analyse(Module, Analysis, function);
analyse(Module, Level) when ?is_level(Level) ->
analyse(Module, coverage, Level).
analyse(Module, Analysis, Level) when ?is_analysis(Analysis),
?is_level(Level) ->
call({{analyse, Analysis, Level}, Module}).
analyze() -> analyse( ).
analyze(Module) -> analyse(Module).
analyze(Module, Analysis) -> analyse(Module, Analysis).
analyze(Module, Analysis, Level) -> analyse(Module, Analysis, Level).
%% analyse_to_file() ->
%% analyse_to_file(Modules) ->
%% analyse_to_file(Modules, Options) ->
%% Modules = Module | [Module]
%% Module = atom()
%% OutFile = string()
%% Options = [Option]
%% Option = html | {outfile,filename()} | {outdir,dirname()}
%% Error = {not_cover_compiled,Module} | no_source_code_found |
%% {file,File,Reason}
%% File = string()
%% Reason = term()
%%
%% Kept for backwards compatibility:
%% analyse_to_file(Modules, OutFile) ->
%% analyse_to_file(Modules, OutFile, Options) -> {ok,OutFile} | {error,Error}
analyse_to_file() ->
analyse_to_file('_').
analyse_to_file(Arg) ->
case is_options(Arg) of
true ->
analyse_to_file('_',Arg);
false ->
analyse_to_file(Arg,[])
end.
analyse_to_file(Module, OutFile) when is_list(OutFile), is_integer(hd(OutFile)) ->
%% Kept for backwards compatibility
analyse_to_file(Module, [{outfile,OutFile}]);
analyse_to_file(Module, Options) when is_list(Options) ->
call({{analyse_to_file, Options}, Module}).
analyse_to_file(Module, OutFile, Options) when is_list(OutFile) ->
%% Kept for backwards compatibility
analyse_to_file(Module,[{outfile,OutFile}|Options]).
analyze_to_file() -> analyse_to_file().
analyze_to_file(Module) -> analyse_to_file(Module).
analyze_to_file(Module, OptOrOut) -> analyse_to_file(Module, OptOrOut).
analyze_to_file(Module, OutFile, Options) ->
analyse_to_file(Module, OutFile, Options).
async_analyse_to_file(Module) ->
do_spawn(?MODULE, analyse_to_file, [Module]).
async_analyse_to_file(Module, OutFileOrOpts) ->
do_spawn(?MODULE, analyse_to_file, [Module, OutFileOrOpts]).
async_analyse_to_file(Module, OutFile, Options) ->
do_spawn(?MODULE, analyse_to_file, [Module, OutFile, Options]).
is_options([html]) ->
true; % this is not 100% safe - could be a module named html...
is_options([html|Opts]) ->
is_options(Opts);
is_options([{Opt,_}|_]) when Opt==outfile; Opt==outdir ->
true;
is_options(_) ->
false.
do_spawn(M,F,A) ->
spawn_link(fun() ->
case apply(M,F,A) of
{ok, _} ->
ok;
{error, Reason} ->
exit(Reason)
end
end).
async_analyze_to_file(Module) ->
async_analyse_to_file(Module).
async_analyze_to_file(Module, OutFileOrOpts) ->
async_analyse_to_file(Module, OutFileOrOpts).
async_analyze_to_file(Module, OutFile, Options) ->
async_analyse_to_file(Module, OutFile, Options).
outfilename(undefined, Module, HTML) ->
outfilename(Module, HTML);
outfilename(OutDir, Module, HTML) ->
filename:join(OutDir, outfilename(Module, HTML)).
outfilename(Module, true) ->
atom_to_list(Module)++".COVER.html";
outfilename(Module, false) ->
atom_to_list(Module)++".COVER.out".
%% export(File)
%% export(File,Module) -> ok | {error,Reason}
%% File = string(); file to write the exported data to
%% Module = atom()
export(File) ->
export(File, '_').
export(File, Module) ->
call({export,File,Module}).
%% import(File) -> ok | {error, Reason}
%% File = string(); file created with cover:export/1,2
import(File) ->
call({import,File}).
%% modules() -> [Module]
%% Module = atom()
modules() ->
call(modules).
%% imported_modules() -> [Module]
%% Module = atom()
imported_modules() ->
call(imported_modules).
%% imported() -> [ImportFile]
%% ImportFile = string()
imported() ->
call(imported).
%% which_nodes() -> [Node]
%% Node = atom()
which_nodes() ->
call(which_nodes).
%% is_compiled(Module) -> {file,File} | false
%% Module = atom()
%% File = string()
is_compiled(Module) when is_atom(Module) ->
call({is_compiled, Module}).
%% reset(Module) -> ok | {error,Error}
%% reset() -> ok
%% Module = atom()
%% Error = {not_cover_compiled,Module}
reset(Module) when is_atom(Module) ->
call({reset, Module}).
reset() ->
call(reset).
%% stop() -> ok
stop() ->
call(stop).
stop(Node) when is_atom(Node) ->
stop([Node]);
stop(Nodes) ->
call({stop,remove_myself(Nodes,[])}).
%% flush(Nodes) -> ok | {error,not_main_node}
%% Nodes = [Node] | Node
%% Node = atom()
%% Error = {not_cover_compiled,Module}
flush(Node) when is_atom(Node) ->
flush([Node]);
flush(Nodes) ->
call({flush,remove_myself(Nodes,[])}).
%% Used by test_server only. Not documented.
get_main_node() ->
call(get_main_node).
%% bump(Module, Function, Arity, Clause, Line)
%% Module = Function = atom()
%% Arity = Clause = Line = integer()
%% This function is inserted into Cover compiled modules, once for each
%% executable line.
%bump(Module, Function, Arity, Clause, Line) ->
% Key = #bump{module=Module, function=Function, arity=Arity, clause=Clause,
% line=Line},
% ets:update_counter(?COVER_TABLE, Key, 1).
call(Request) ->
Ref = erlang:monitor(process,?SERVER),
receive {'DOWN', Ref, _Type, _Object, noproc} ->
erlang:demonitor(Ref),
start(),
call(Request)
after 0 ->
?SERVER ! {self(),Request},
Return =
receive
{'DOWN', Ref, _Type, _Object, Info} ->
exit(Info);
{?SERVER,Reply} ->
Reply
end,
erlang:demonitor(Ref, [flush]),
Return
end.
reply(From, Reply) ->
From ! {?SERVER,Reply}.
is_from(From) ->
is_pid(From).
remote_call(Node,Request) ->
Ref = erlang:monitor(process,{?SERVER,Node}),
receive {'DOWN', Ref, _Type, _Object, noproc} ->
erlang:demonitor(Ref),
{error,node_dead}
after 0 ->
{?SERVER,Node} ! Request,
Return =
receive
{'DOWN', Ref, _Type, _Object, _Info} ->
case Request of
{remote,stop} -> ok;
_ -> {error,node_dead}
end;
{?SERVER,Reply} ->
Reply
end,
erlang:demonitor(Ref, [flush]),
Return
end.
remote_reply(Proc,Reply) when is_pid(Proc) ->
Proc ! {?SERVER,Reply};
remote_reply(MainNode,Reply) ->
{?SERVER,MainNode} ! {?SERVER,Reply}.
%%%----------------------------------------------------------------------
%%% cover_server on main node
%%%----------------------------------------------------------------------
init_main(Starter) ->
register(?SERVER,self()),
%% Having write concurrancy here gives a 40% performance boost
%% when collect/1 is called.
ets:new(?COVER_TABLE, [set, public, named_table
,{write_concurrency, true}
]),
ets:new(?COVER_CLAUSE_TABLE, [set, public, named_table]),
ets:new(?BINARY_TABLE, [set, public, named_table]),
ets:new(?COLLECTION_TABLE, [set, public, named_table]),
ets:new(?COLLECTION_CLAUSE_TABLE, [set, public, named_table]),
net_kernel:monitor_nodes(true),
Starter ! {?SERVER,started},
main_process_loop(#main_state{}).
main_process_loop(State) ->
receive
{From, {start_nodes,Nodes}} ->
{StartedNodes,State1} = do_start_nodes(Nodes, State),
reply(From, {ok,StartedNodes}),
main_process_loop(State1);
{From, {compile, Files, Options}} ->
{R,S} = do_compile(Files, Options, State),
reply(From,R),
%% This module (cover) could have been reloaded. Make
%% sure we run the new code.
?MODULE:main_process_loop(S);
{From, {compile_beams, ModsAndFiles}} ->
{R,S} = do_compile_beams(ModsAndFiles,State),
reply(From,R),
%% This module (cover) could have been reloaded. Make
%% sure we run the new code.
?MODULE:main_process_loop(S);
{From, {export,OutFile,Module}} ->
spawn(fun() ->
?SPAWN_DBG(export,{OutFile, Module}),
do_export(Module, OutFile, From, State)
end),
main_process_loop(State);
{From, {import,File}} ->
case file:open(File,[read,binary,raw]) of
{ok,Fd} ->
Imported = do_import_to_table(Fd,File,
State#main_state.imported),
reply(From, ok),
file:close(Fd),
main_process_loop(State#main_state{imported=Imported});
{error,Reason} ->
reply(From, {error, {cant_open_file,File,Reason}}),
main_process_loop(State)
end;
{From, modules} ->
%% Get all compiled modules which are still loaded
{LoadedModules,Compiled} =
get_compiled_still_loaded(State#main_state.nodes,
State#main_state.compiled),
reply(From, LoadedModules),
main_process_loop(State#main_state{compiled=Compiled});
{From, imported_modules} ->
%% Get all modules with imported data
ImportedModules = lists:map(fun({Mod,_File,_ImportFile}) -> Mod end,
State#main_state.imported),
reply(From, ImportedModules),
main_process_loop(State);
{From, imported} ->
%% List all imported files
reply(From, get_all_importfiles(State#main_state.imported,[])),
main_process_loop(State);
{From, which_nodes} ->
%% List all imported files
reply(From, State#main_state.nodes),
main_process_loop(State);
{From, reset} ->
lists:foreach(
fun({Module,_File}) ->
do_reset_main_node(Module,State#main_state.nodes)
end,
State#main_state.compiled),
reply(From, ok),
main_process_loop(State#main_state{imported=[]});
{From, {stop,Nodes}} ->
remote_collect('_',Nodes,true),
reply(From, ok),
Nodes1 = State#main_state.nodes--Nodes,
LostNodes1 = State#main_state.lost_nodes--Nodes,
main_process_loop(State#main_state{nodes=Nodes1,
lost_nodes=LostNodes1});
{From, {flush,Nodes}} ->
remote_collect('_',Nodes,false),
reply(From, ok),
main_process_loop(State);
{From, stop} ->
lists:foreach(
fun(Node) ->
remote_call(Node,{remote,stop})
end,
State#main_state.nodes),
reload_originals(State#main_state.compiled),
ets:delete(?COVER_TABLE),
ets:delete(?COVER_CLAUSE_TABLE),
ets:delete(?BINARY_TABLE),
ets:delete(?COLLECTION_TABLE),
ets:delete(?COLLECTION_CLAUSE_TABLE),
unregister(?SERVER),
reply(From, ok);
{From, {{analyse, Analysis, Level}, '_'}} ->
R = analyse_all(Analysis, Level, State),
reply(From, R),
main_process_loop(State);
{From, {{analyse, Analysis, Level}, Modules}} when is_list(Modules) ->
R = analyse_list(Modules, Analysis, Level, State),
reply(From, R),
main_process_loop(State);
{From, {{analyse, Analysis, Level}, Module}} ->
S = try
Loaded = is_loaded(Module, State),
spawn(fun() ->
?SPAWN_DBG(analyse,{Module,Analysis, Level}),
do_parallel_analysis(
Module, Analysis, Level,
Loaded, From, State)
end),
State
catch throw:Reason ->
reply(From,{error, {not_cover_compiled,Module}}),
not_loaded(Module, Reason, State)
end,
main_process_loop(S);
{From, {{analyse_to_file, Opts},'_'}} ->
R = analyse_all_to_file(Opts, State),
reply(From,R),
main_process_loop(State);
{From, {{analyse_to_file, Opts},Modules}} when is_list(Modules) ->
R = analyse_list_to_file(Modules, Opts, State),
reply(From,R),
main_process_loop(State);
{From, {{analyse_to_file, Opts},Module}} ->
S = try
Loaded = is_loaded(Module, State),
spawn(fun() ->
?SPAWN_DBG(analyse_to_file,{Module,Opts}),
do_parallel_analysis_to_file(
Module, Opts, Loaded, From, State)
end),
State
catch throw:Reason ->
reply(From,{error, {not_cover_compiled,Module}}),
not_loaded(Module, Reason, State)
end,
main_process_loop(S);
{From, {is_compiled, Module}} ->
S = try is_loaded(Module, State) of
{loaded, File} ->
reply(From,{file, File}),
State;
{imported,_File,_ImportFiles} ->
reply(From,false),
State
catch throw:Reason ->
reply(From,false),
not_loaded(Module, Reason, State)
end,
main_process_loop(S);
{From, {reset, Module}} ->
S = try
Loaded = is_loaded(Module,State),
R = case Loaded of
{loaded, _File} ->
do_reset_main_node(
Module, State#main_state.nodes);
{imported, _File, _} ->
do_reset_collection_table(Module)
end,
Imported =
remove_imported(Module,
State#main_state.imported),
reply(From, R),
State#main_state{imported=Imported}
catch throw:Reason ->
reply(From,{error, {not_cover_compiled,Module}}),
not_loaded(Module, Reason, State)
end,
main_process_loop(S);
{'DOWN', _MRef, process, {?SERVER,Node}, _Info} ->
%% A remote cover_server is down, mark as lost
{Nodes,Lost} =
case lists:member(Node,State#main_state.nodes) of
true ->
N = State#main_state.nodes--[Node],
L = [Node|State#main_state.lost_nodes],
{N,L};
false -> % node stopped
{State#main_state.nodes,State#main_state.lost_nodes}
end,
main_process_loop(State#main_state{nodes=Nodes,lost_nodes=Lost});
{nodeup,Node} ->
State1 =
case lists:member(Node,State#main_state.lost_nodes) of
true ->
sync_compiled(Node,State);
false ->
State
end,
main_process_loop(State1);
{nodedown,_} ->
%% Will be taken care of when 'DOWN' message arrives
main_process_loop(State);
{From, get_main_node} ->
reply(From, node()),
main_process_loop(State);
get_status ->
io:format("~tp~n",[State]),
main_process_loop(State)
end.
%%%----------------------------------------------------------------------
%%% cover_server on remote node
%%%----------------------------------------------------------------------
init_remote(Starter,MainNode) ->
register(?SERVER,self()),
ets:new(?COVER_TABLE, [set, public, named_table
%% write_concurrency here makes otp_8270 break :(
%,{write_concurrency, true}
]),
ets:new(?COVER_CLAUSE_TABLE, [set, public, named_table]),
Starter ! {self(),started},
remote_process_loop(#remote_state{main_node=MainNode}).
remote_process_loop(State) ->
receive
{remote,load_compiled,Compiled} ->
Compiled1 = load_compiled(Compiled,State#remote_state.compiled),
remote_reply(State#remote_state.main_node, ok),
?MODULE:remote_process_loop(State#remote_state{compiled=Compiled1});
{remote,unload,UnloadedModules} ->
unload(UnloadedModules),
Compiled =
update_compiled(UnloadedModules, State#remote_state.compiled),
remote_reply(State#remote_state.main_node, ok),
remote_process_loop(State#remote_state{compiled=Compiled});
{remote,reset,Module} ->
do_reset(Module),
remote_reply(State#remote_state.main_node, ok),
remote_process_loop(State);
{remote,collect,Module,CollectorPid} ->
self() ! {remote,collect,Module,CollectorPid, ?SERVER};
{remote,collect,Modules0,CollectorPid,From} ->
Modules = case Modules0 of
'_' -> [M || {M,_} <- State#remote_state.compiled];
_ -> Modules0
end,
spawn(fun() ->
?SPAWN_DBG(remote_collect,
{Modules, CollectorPid, From}),
do_collect(Modules, CollectorPid, From)
end),
remote_process_loop(State);
{remote,stop} ->
reload_originals(State#remote_state.compiled),
ets:delete(?COVER_TABLE),
ets:delete(?COVER_CLAUSE_TABLE),
unregister(?SERVER),
ok; % not replying since 'DOWN' message will be received anyway
{remote,get_compiled} ->
remote_reply(State#remote_state.main_node,
State#remote_state.compiled),
remote_process_loop(State);
{From, get_main_node} ->
remote_reply(From, State#remote_state.main_node),
remote_process_loop(State);
get_status ->
io:format("~tp~n",[State]),
remote_process_loop(State);
M ->
io:format("WARNING: remote cover_server received\n~p\n",[M]),
case M of
{From,_} ->
case is_from(From) of
true ->
reply(From,{error,not_main_node});
false ->
ok
end;
_ ->
ok
end,
remote_process_loop(State)
end.
do_collect(Modules, CollectorPid, From) ->
pmap(
fun(Module) ->
Pattern = {#bump{module=Module, _='_'}, '$1'},
MatchSpec = [{Pattern,[{'=/=','$1',0}],['$_']}],
Match = ets:select(?COVER_TABLE,MatchSpec,?CHUNK_SIZE),
send_chunks(Match, CollectorPid, [])
end,Modules),
CollectorPid ! done,
remote_reply(From, ok).
send_chunks('$end_of_table', _CollectorPid, Mons) ->
get_downs(Mons);
send_chunks({Chunk,Continuation}, CollectorPid, Mons) ->
Mon = spawn_monitor(
fun() ->
lists:foreach(fun({Bump,_N}) ->
ets:insert(?COVER_TABLE, {Bump,0})
end,
Chunk) end),
send_chunk(CollectorPid,Chunk),
send_chunks(ets:select(Continuation), CollectorPid, [Mon|Mons]).
send_chunk(CollectorPid,Chunk) ->
CollectorPid ! {chunk,Chunk,self()},
receive continue -> ok end.
get_downs([]) ->
ok;
get_downs(Mons) ->
receive
{'DOWN', Ref, _Type, Pid, _Reason} = Down ->
case lists:member({Pid,Ref},Mons) of
true ->
get_downs(lists:delete({Pid,Ref},Mons));
false ->
%% This should be handled somewhere else
self() ! Down,
get_downs(Mons)
end
end.
reload_originals(Compiled) ->
Modules = [M || {M,_} <- Compiled],
pmap(fun do_reload_original/1, Modules).
do_reload_original(Module) ->
case code:which(Module) of
?TAG ->
code:purge(Module), % remove code marked as 'old'
code:delete(Module), % mark cover compiled code as 'old'
%% Note: original beam code must be loaded before the cover
%% compiled code is purged, in order to for references to
%% 'fun M:F/A' and %% 'fun F/A' funs to be correct (they
%% refer to (M:)F/A in the *latest* version of the module)
code:load_file(Module), % load original code
code:purge(Module); % remove cover compiled code
_ ->
ignore
end.
load_compiled([{Module,File,Binary,InitialTable}|Compiled],Acc) ->
%% Make sure the #bump{} records are available *before* the
%% module is loaded.
insert_initial_data(InitialTable),
Sticky = case code:is_sticky(Module) of
true ->
code:unstick_mod(Module),
true;
false ->
false
end,
NewAcc = case code:load_binary(Module, ?TAG, Binary) of
{module,Module} ->
add_compiled(Module, File, Acc);
_ ->
do_clear(Module),
Acc
end,
case Sticky of
true -> code:stick_mod(Module);
false -> ok
end,
load_compiled(Compiled,NewAcc);
load_compiled([],Acc) ->
Acc.
insert_initial_data([Item|Items]) when is_atom(element(1,Item)) ->
ets:insert(?COVER_CLAUSE_TABLE, Item),
insert_initial_data(Items);
insert_initial_data([Item|Items]) ->
ets:insert(?COVER_TABLE, Item),
insert_initial_data(Items);
insert_initial_data([]) ->
ok.
unload([Module|Modules]) ->
do_clear(Module),
do_reload_original(Module),
unload(Modules);
unload([]) ->
ok.
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
%%%--Handling of remote nodes--------------------------------------------
do_start_nodes(Nodes, State) ->
ThisNode = node(),
StartedNodes =
lists:foldl(
fun(Node,Acc) ->
case rpc:call(Node,cover,remote_start,[ThisNode]) of
{ok,_RPid} ->
erlang:monitor(process,{?SERVER,Node}),
[Node|Acc];
Error ->
io:format("Could not start cover on ~w: ~tp\n",
[Node,Error]),
Acc
end
end,
[],
Nodes),
%% In case some of the compiled modules have been unloaded they
%% should not be loaded on the new node.
{_LoadedModules,Compiled} =
get_compiled_still_loaded(State#main_state.nodes,
State#main_state.compiled),
remote_load_compiled(StartedNodes,Compiled),
State1 =
State#main_state{nodes = State#main_state.nodes ++ StartedNodes,
compiled = Compiled},
{StartedNodes, State1}.
%% start the cover_server on a remote node
remote_start(MainNode) ->
case whereis(?SERVER) of
undefined ->
Starter = self(),
Pid = spawn(fun() ->
?SPAWN_DBG(remote_start,{MainNode}),
init_remote(Starter,MainNode)
end),
Ref = erlang:monitor(process,Pid),
Return =
receive
{Pid,started} ->
{ok,Pid};
{'DOWN', Ref, _Type, _Object, Info} ->
{error,Info}
end,
erlang:demonitor(Ref),
Return;
Pid ->
{error,{already_started,Pid}}
end.
%% If a lost node comes back, ensure that main and remote node has the
%% same cover compiled modules. Note that no action is taken if the
%% same {Mod,File} eksists on both, i.e. code change is not handled!
sync_compiled(Node,State) ->
#main_state{compiled=Compiled0,nodes=Nodes,lost_nodes=Lost}=State,
State1 =
case remote_call(Node,{remote,get_compiled}) of
{error,node_dead} ->
{_,S} = do_start_nodes([Node],State),
S;
{error,_} ->
State;
RemoteCompiled ->
{_,Compiled} = get_compiled_still_loaded(Nodes,Compiled0),
Unload = [UM || {UM,_}=U <- RemoteCompiled,
false == lists:member(U,Compiled)],
remote_unload([Node],Unload),
Load = [L || L <- Compiled,
false == lists:member(L,RemoteCompiled)],
remote_load_compiled([Node],Load),
State#main_state{compiled=Compiled, nodes=[Node|Nodes]}
end,
State1#main_state{lost_nodes=Lost--[Node]}.
%% Load a set of cover compiled modules on remote nodes,
%% We do it ?MAX_MODS modules at a time so that we don't
%% run out of memory on the cover_server node.
-define(MAX_MODS, 10).
remote_load_compiled(Nodes,Compiled) ->
remote_load_compiled(Nodes, Compiled, [], 0).
remote_load_compiled(_Nodes, [], [], _ModNum) ->
ok;
remote_load_compiled(Nodes, Compiled, Acc, ModNum)
when Compiled == []; ModNum == ?MAX_MODS ->
RemoteLoadData = get_downs_r(Acc),
lists:foreach(
fun(Node) ->
remote_call(Node,{remote,load_compiled,RemoteLoadData})
end,
Nodes),
remote_load_compiled(Nodes, Compiled, [], 0);
remote_load_compiled(Nodes, [MF | Rest], Acc, ModNum) ->
remote_load_compiled(
Nodes, Rest,
[spawn_job_r(fun() -> get_data_for_remote_loading(MF) end) | Acc],
ModNum + 1).
spawn_job_r(Fun) ->
spawn_monitor(fun() -> exit(Fun()) end).
get_downs_r([]) ->
[];
get_downs_r(Mons) ->
receive
{'DOWN', Ref, _Type, Pid, R={_,_,_,_}} ->
[R|get_downs_r(lists:delete({Pid,Ref},Mons))];
{'DOWN', Ref, _Type, Pid, Reason} = Down ->
case lists:member({Pid,Ref},Mons) of
true ->
%% Something went really wrong - don't hang!
exit(Reason);
false ->
%% This should be handled somewhere else
self() ! Down,
get_downs_r(Mons)
end
end.
%% Read all data needed for loading a cover compiled module on a remote node
%% Binary is the beam code for the module and InitialTable is the initial
%% data to insert in ?COVER_TABLE.
get_data_for_remote_loading({Module,File}) ->
[{Module,Binary}] = ets:lookup(?BINARY_TABLE,Module),
%%! The InitialTable list will be long if the module is big - what to do??
InitialBumps = ets:select(?COVER_TABLE,ms(Module)),
InitialClauses = ets:lookup(?COVER_CLAUSE_TABLE,Module),
{Module,File,Binary,InitialBumps ++ InitialClauses}.
%% Create a match spec which returns the clause info {Module,InitInfo} and
%% all #bump keys for the given module with 0 number of calls.
ms(Module) ->
ets:fun2ms(fun({Key,_}) when Key#bump.module=:=Module ->
{Key,0}
end).
%% Unload modules on remote nodes
remote_unload(Nodes,UnloadedModules) ->
lists:foreach(
fun(Node) ->
remote_call(Node,{remote,unload,UnloadedModules})
end,
Nodes).
%% Reset one or all modules on remote nodes
remote_reset(Module,Nodes) ->
lists:foreach(
fun(Node) ->
remote_call(Node,{remote,reset,Module})
end,
Nodes).
%% Collect data from remote nodes - used for analyse or stop(Node)
remote_collect(Modules,Nodes,Stop) ->
pmap(fun(Node) ->
?SPAWN_DBG(remote_collect,
{Modules, Nodes, Stop}),
do_collection(Node, Modules, Stop)
end,
Nodes).
do_collection(Node, Module, Stop) ->
CollectorPid = spawn(fun collector_proc/0),
case remote_call(Node,{remote,collect,Module,CollectorPid, self()}) of
{error,node_dead} ->
CollectorPid ! done,
ok;
ok when Stop ->
remote_call(Node,{remote,stop});
ok ->
ok
end.
%% Process which receives chunks of data from remote nodes - either when
%% analysing or when stopping cover on the remote nodes.
collector_proc() ->
?SPAWN_DBG(collector_proc, []),
receive
{chunk,Chunk,From} ->
insert_in_collection_table(Chunk),
From ! continue,
collector_proc();
done ->
ok
end.
insert_in_collection_table([{Key,Val}|Chunk]) ->
insert_in_collection_table(Key,Val),
insert_in_collection_table(Chunk);
insert_in_collection_table([]) ->
ok.
insert_in_collection_table(Key,Val) ->
case ets:member(?COLLECTION_TABLE,Key) of
true ->
ets:update_counter(?COLLECTION_TABLE,
Key,Val);
false ->
%% Make sure that there are no race conditions from ets:member
case ets:insert_new(?COLLECTION_TABLE,{Key,Val}) of
false ->
insert_in_collection_table(Key,Val);
_ ->
ok
end
end.
remove_myself([Node|Nodes],Acc) when Node=:=node() ->
remove_myself(Nodes,Acc);
remove_myself([Node|Nodes],Acc) ->
remove_myself(Nodes,[Node|Acc]);
remove_myself([],Acc) ->
Acc.
%%%--Handling of modules state data--------------------------------------
analyse_info(_Module,[]) ->
ok;
analyse_info(Module,Imported) ->
imported_info("Analysis",Module,Imported).
export_info(_Module,[]) ->
ok;
export_info(_Module,_Imported) ->
%% Do not print that the export includes imported modules
ok.
export_info([]) ->
ok;
export_info(_Imported) ->
%% Do not print that the export includes imported modules
ok.
get_all_importfiles([{_M,_F,ImportFiles}|Imported],Acc) ->
NewAcc = do_get_all_importfiles(ImportFiles,Acc),
get_all_importfiles(Imported,NewAcc);
get_all_importfiles([],Acc) ->
Acc.
do_get_all_importfiles([ImportFile|ImportFiles],Acc) ->
case lists:member(ImportFile,Acc) of
true ->
do_get_all_importfiles(ImportFiles,Acc);
false ->
do_get_all_importfiles(ImportFiles,[ImportFile|Acc])
end;
do_get_all_importfiles([],Acc) ->
Acc.
imported_info(Text,Module,Imported) ->
case lists:keysearch(Module,1,Imported) of
{value,{Module,_File,ImportFiles}} ->
io:format("~ts includes data from imported files\n~tp\n",
[Text,ImportFiles]);
false ->
ok
end.
add_imported(Module, File, ImportFile, Imported) ->
add_imported(Module, File, filename:absname(ImportFile), Imported, []).
add_imported(M, F1, ImportFile, [{M,_F2,ImportFiles}|Imported], Acc) ->
case lists:member(ImportFile,ImportFiles) of
true ->
io:fwrite("WARNING: Module ~w already imported from ~tp~n"
"Not importing again!~n",[M,ImportFile]),
dont_import;
false ->
NewEntry = {M, F1, [ImportFile | ImportFiles]},
{ok, lists:reverse([NewEntry | Acc]) ++ Imported}
end;
add_imported(M, F, ImportFile, [H|Imported], Acc) ->
add_imported(M, F, ImportFile, Imported, [H|Acc]);
add_imported(M, F, ImportFile, [], Acc) ->
{ok, lists:reverse([{M, F, [ImportFile]} | Acc])}.
%% Removes a module from the list of imported modules and writes a warning
%% This is done when a module is compiled.
remove_imported(Module,Imported) ->
case lists:keysearch(Module,1,Imported) of
{value,{Module,_,ImportFiles}} ->
io:fwrite("WARNING: Deleting data for module ~w imported from~n"
"~tp~n",[Module,ImportFiles]),
lists:keydelete(Module,1,Imported);
false ->
Imported
end.
%% Adds information to the list of compiled modules, preserving time order
%% and without adding duplicate entries.
add_compiled(Module, File1, [{Module,_File2}|Compiled]) ->
[{Module,File1}|Compiled];
add_compiled(Module, File, [H|Compiled]) ->
[H|add_compiled(Module, File, Compiled)];
add_compiled(Module, File, []) ->
[{Module,File}].
are_loaded([Module|Modules], State, Loaded, Imported, Error) ->
try is_loaded(Module,State) of
{loaded,File} ->
are_loaded(Modules, State, [{Module,File}|Loaded], Imported, Error);
{imported,File,_} ->
are_loaded(Modules, State, Loaded, [{Module,File}|Imported], Error)
catch throw:_ ->
are_loaded(Modules, State, Loaded, Imported,
[{not_cover_compiled,Module}|Error])
end;
are_loaded([], _State, Loaded, Imported, Error) ->
{Loaded, Imported, Error}.
is_loaded(Module, State) ->
case get_file(Module, State#main_state.compiled) of
{ok, File} ->
case code:which(Module) of
?TAG -> {loaded, File};
_ -> throw(unloaded)
end;
false ->
case get_file(Module,State#main_state.imported) of
{ok,File,ImportFiles} ->
{imported, File, ImportFiles};
false ->
throw(not_loaded)
end
end.
get_file(Module, [{Module, File}|_T]) ->
{ok, File};
get_file(Module, [{Module, File, ImportFiles}|_T]) ->
{ok, File, ImportFiles};
get_file(Module, [_H|T]) ->
get_file(Module, T);
get_file(_Module, []) ->
false.
get_beam_file(Module,?TAG,Compiled) ->
{value,{Module,File}} = lists:keysearch(Module,1,Compiled),
case filename:extension(File) of
".erl" -> {error,no_beam};
".beam" -> {ok,File}
end;
get_beam_file(_Module,BeamFile,_Compiled) ->
{ok,BeamFile}.
get_modules(Compiled) ->
lists:map(fun({Module, _File}) -> Module end, Compiled).
update_compiled([Module|Modules], [{Module,_File}|Compiled]) ->
update_compiled(Modules, Compiled);
update_compiled(Modules, [H|Compiled]) ->
[H|update_compiled(Modules, Compiled)];
update_compiled(_Modules, []) ->
[].
%% Get all compiled modules which are still loaded, and possibly an
%% updated version of the Compiled list.
get_compiled_still_loaded(Nodes,Compiled0) ->
%% Find all Cover compiled modules which are still loaded
CompiledModules = get_modules(Compiled0),
LoadedModules = lists:filter(fun(Module) ->
case code:which(Module) of
?TAG -> true;
_ -> false
end
end,
CompiledModules),
%% If some Cover compiled modules have been unloaded, update the database.
UnloadedModules = CompiledModules--LoadedModules,
Compiled =
case UnloadedModules of
[] ->
Compiled0;
_ ->
lists:foreach(fun(Module) -> do_clear(Module) end,
UnloadedModules),
remote_unload(Nodes,UnloadedModules),
update_compiled(UnloadedModules, Compiled0)
end,
{LoadedModules,Compiled}.
%%%--Compilation---------------------------------------------------------
do_compile_beams(ModsAndFiles, State) ->
Result0 = pmap(fun({ok,Module,File}) ->
do_compile_beam(Module,File,State);
(Error) ->
Error
end,
ModsAndFiles),
Compiled = [{M,F} || {ok,M,F} <- Result0],
remote_load_compiled(State#main_state.nodes,Compiled),
fix_state_and_result(Result0,State,[]).
do_compile_beam(Module,BeamFile0,State) ->
case get_beam_file(Module,BeamFile0,State#main_state.compiled) of
{ok,BeamFile} ->
UserOptions = get_compile_options(Module,BeamFile),
case do_compile_beam1(Module,BeamFile,UserOptions) of
{ok, Module} ->
{ok,Module,BeamFile};
error ->
{error, BeamFile};
{error,Reason} -> % no abstract code
{error, {Reason, BeamFile}}
end;
{error,no_beam} ->
%% The module has first been compiled from .erl, and now
%% someone tries to compile it from .beam
{error,{already_cover_compiled,no_beam_found,Module}}
end.
fix_state_and_result([{ok,Module,BeamFile}|Rest],State,Acc) ->
Compiled = add_compiled(Module,BeamFile,State#main_state.compiled),
Imported = remove_imported(Module,State#main_state.imported),
NewState = State#main_state{compiled=Compiled,imported=Imported},
fix_state_and_result(Rest,NewState,[{ok,Module}|Acc]);
fix_state_and_result([Error|Rest],State,Acc) ->
fix_state_and_result(Rest,State,[Error|Acc]);
fix_state_and_result([],State,Acc) ->
{lists:reverse(Acc),State}.
do_compile(Files, Options, State) ->
Result0 = pmap(fun(File) ->
do_compile(File, Options)
end,
Files),
Compiled = [{M,F} || {ok,M,F} <- Result0],
remote_load_compiled(State#main_state.nodes,Compiled),
fix_state_and_result(Result0,State,[]).
do_compile(File, Options) ->
case do_compile1(File, Options) of
{ok, Module} ->
{ok,Module,File};
error ->
{error,File}
end.
%% do_compile1(File, Options) -> {ok,Module} | error
do_compile1(File, UserOptions) ->
Options = [debug_info,binary,report_errors,report_warnings] ++ UserOptions,
case compile:file(File, Options) of
{ok, Module, Binary} ->
do_compile_beam1(Module,Binary,UserOptions);
error ->
error
end.
%% Beam is a binary or a .beam file name
do_compile_beam1(Module,Beam,UserOptions) ->
%% Clear database
do_clear(Module),
%% Extract the abstract format and insert calls to bump/6 at
%% every executable line and, as a side effect, initiate
%% the database
case get_abstract_code(Module, Beam) of
no_abstract_code=E ->
{error,E};
encrypted_abstract_code=E ->
{error,E};
{raw_abstract_v1,Code} ->
Forms0 = epp:interpret_file_attribute(Code),
{Forms,Vars} = transform(Forms0, Module),
%% We need to recover the source from the compilation
%% info otherwise the newly compiled module will have
%% source pointing to the current directory
SourceInfo = get_source_info(Module, Beam),
%% Compile and load the result
%% It's necessary to check the result of loading since it may
%% fail, for example if Module resides in a sticky directory
{ok, Module, Binary} = compile:forms(Forms, SourceInfo ++ UserOptions),
case code:load_binary(Module, ?TAG, Binary) of
{module, Module} ->
%% Store info about all function clauses in database
InitInfo = lists:reverse(Vars#vars.init_info),
ets:insert(?COVER_CLAUSE_TABLE, {Module, InitInfo}),
%% Store binary code so it can be loaded on remote nodes
ets:insert(?BINARY_TABLE, {Module, Binary}),
{ok, Module};
_Error ->
do_clear(Module),
error
end;
{_VSN,_Code} ->
%% Wrong version of abstract code. Just report that there
%% is no abstract code.
{error,no_abstract_code}
end.
get_abstract_code(Module, Beam) ->
case beam_lib:chunks(Beam, [abstract_code]) of
{ok, {Module, [{abstract_code, AbstractCode}]}} ->
AbstractCode;
{error,beam_lib,{key_missing_or_invalid,_,_}} ->
encrypted_abstract_code;
Error -> Error
end.
get_source_info(Module, Beam) ->
Compile = get_compile_info(Module, Beam),
case lists:keyfind(source, 1, Compile) of
{ source, _ } = Tuple -> [Tuple];
false -> []
end.
get_compile_options(Module, Beam) ->
Compile = get_compile_info(Module, Beam),
case lists:keyfind(options, 1, Compile) of
{options, Options } -> filter_options(Options);
false -> []
end.
get_compile_info(Module, Beam) ->
case beam_lib:chunks(Beam, [compile_info]) of
{ok, {Module, [{compile_info, Compile}]}} ->
Compile;
_ ->
[]
end.
transform(Code, Module) ->
MainFile=find_main_filename(Code),
Vars0 = #vars{module=Module},
{ok,MungedForms,Vars} = transform_2(Code,[],Vars0,MainFile,on),
{MungedForms,Vars}.
%% Helpfunction which returns the first found file-attribute, which can
%% be interpreted as the name of the main erlang source file.
find_main_filename([{attribute,_,file,{MainFile,_}}|_]) ->
MainFile;
find_main_filename([_|Rest]) ->
find_main_filename(Rest).
transform_2([Form0|Forms],MungedForms,Vars,MainFile,Switch) ->
Form = expand(Form0),
case munge(Form,Vars,MainFile,Switch) of
ignore ->
transform_2(Forms,MungedForms,Vars,MainFile,Switch);
{MungedForm,Vars2,NewSwitch} ->
transform_2(Forms,[MungedForm|MungedForms],Vars2,MainFile,NewSwitch)
end;
transform_2([],MungedForms,Vars,_,_) ->
{ok, lists:reverse(MungedForms), Vars}.
%% Expand short-circuit Boolean expressions.
expand(Expr) ->
AllVars = sets:from_list(ordsets:to_list(vars([], Expr))),
{Expr1,_} = expand(Expr, AllVars, 1),
Expr1.
expand({clause,Line,Pattern,Guards,Body}, Vs, N) ->
{ExpandedBody,N2} = expand(Body, Vs, N),
{{clause,Line,Pattern,Guards,ExpandedBody},N2};
expand({op,_Line,'andalso',ExprL,ExprR}, Vs, N) ->
{ExpandedExprL,N2} = expand(ExprL, Vs, N),
{ExpandedExprR,N3} = expand(ExprR, Vs, N2),
Anno = element(2, ExpandedExprL),
{bool_switch(ExpandedExprL,
ExpandedExprR,
{atom,Anno,false},
Vs, N3),
N3 + 1};
expand({op,_Line,'orelse',ExprL,ExprR}, Vs, N) ->
{ExpandedExprL,N2} = expand(ExprL, Vs, N),
{ExpandedExprR,N3} = expand(ExprR, Vs, N2),
Anno = element(2, ExpandedExprL),
{bool_switch(ExpandedExprL,
{atom,Anno,true},
ExpandedExprR,
Vs, N3),
N3 + 1};
expand(T, Vs, N) when is_tuple(T) ->
{TL,N2} = expand(tuple_to_list(T), Vs, N),
{list_to_tuple(TL),N2};
expand([E|Es], Vs, N) ->
{E2,N2} = expand(E, Vs, N),
{Es2,N3} = expand(Es, Vs, N2),
{[E2|Es2],N3};
expand(T, _Vs, N) ->
{T,N}.
vars(A, {var,_,V}) when V =/= '_' ->
[V|A];
vars(A, T) when is_tuple(T) ->
vars(A, tuple_to_list(T));
vars(A, [E|Es]) ->
vars(vars(A, E), Es);
vars(A, _T) ->
A.
bool_switch(E, T, F, AllVars, AuxVarN) ->
Line = element(2, E),
AuxVar = {var,Line,aux_var(AllVars, AuxVarN)},
{'case',Line,E,
[{clause,Line,[{atom,Line,true}],[],[T]},
{clause,Line,[{atom,Line,false}],[],[F]},
{clause,Line,[AuxVar],[],
[{call,Line,
{remote,Line,{atom,Line,erlang},{atom,Line,error}},
[{tuple,Line,[{atom,Line,badarg},AuxVar]}]}]}]}.
aux_var(Vars, N) ->
Name = list_to_atom(lists:concat(['_', N])),
case sets:is_element(Name, Vars) of
true -> aux_var(Vars, N + 1);
false -> Name
end.
%% This code traverses the abstract code, stored as the abstract_code
%% chunk in the BEAM file, as described in absform(3).
%% The switch is turned off when we encounter other files than the main file.
%% This way we will be able to exclude functions defined in include files.
munge({function,Line,Function,Arity,Clauses},Vars,_MainFile,on) ->
Vars2 = Vars#vars{function=Function,
arity=Arity,
clause=1,
lines=[],
no_bump_lines=[],
depth=1},
{MungedClauses, Vars3} = munge_clauses(Clauses, Vars2),
{{function,Line,Function,Arity,MungedClauses},Vars3,on};
munge(Form={attribute,_,file,{MainFile,_}},Vars,MainFile,_Switch) ->
{Form,Vars,on}; % Switch on tranformation!
munge(Form={attribute,_,file,{_InclFile,_}},Vars,_MainFile,_Switch) ->
{Form,Vars,off}; % Switch off transformation!
munge({attribute,_,compile,{parse_transform,_}},_Vars,_MainFile,_Switch) ->
%% Don't want to run parse transforms more than once.
ignore;
munge(Form,Vars,_MainFile,Switch) -> % Other attributes and skipped includes.
{Form,Vars,Switch}.
munge_clauses(Clauses, Vars) ->
munge_clauses(Clauses, Vars, Vars#vars.lines, []).
munge_clauses([Clause|Clauses], Vars, Lines, MClauses) ->
{clause,Line,Pattern,Guards,Body} = Clause,
{MungedGuards, _Vars} = munge_exprs(Guards, Vars#vars{is_guard=true},[]),
case Vars#vars.depth of
1 -> % function clause
{MungedBody, Vars2} = munge_body(Body, Vars#vars{depth=2}),
ClauseInfo = {Vars2#vars.module,
Vars2#vars.function,
Vars2#vars.arity,
Vars2#vars.clause,
length(Vars2#vars.lines)}, % Not used?
InitInfo = [ClauseInfo | Vars2#vars.init_info],
Vars3 = Vars2#vars{init_info=InitInfo,
clause=(Vars2#vars.clause)+1,
lines=[],
no_bump_lines=[],
depth=1},
NewBumps = Vars2#vars.lines,
NewLines = NewBumps ++ Lines,
munge_clauses(Clauses, Vars3, NewLines,
[{clause,Line,Pattern,MungedGuards,MungedBody}|
MClauses]);
2 -> % receive-, case-, if-, or try-clause
Lines0 = Vars#vars.lines,
{MungedBody, Vars2} = munge_body(Body, Vars),
NewBumps = new_bumps(Vars2, Vars),
NewLines = NewBumps ++ Lines,
munge_clauses(Clauses, Vars2#vars{lines=Lines0},
NewLines,
[{clause,Line,Pattern,MungedGuards,MungedBody}|
MClauses])
end;
munge_clauses([], Vars, Lines, MungedClauses) ->
{lists:reverse(MungedClauses), Vars#vars{lines = Lines}}.
munge_body(Expr, Vars) ->
munge_body(Expr, Vars, [], []).
munge_body([Expr|Body], Vars, MungedBody, LastExprBumpLines) ->
%% Here is the place to add a call to cover:bump/6!
Line = erl_anno:line(element(2, Expr)),
Lines = Vars#vars.lines,
case lists:member(Line,Lines) of
true -> % already a bump at this line
{MungedExpr, Vars2} = munge_expr(Expr, Vars),
NewBumps = new_bumps(Vars2, Vars),
NoBumpLines = [Line|Vars#vars.no_bump_lines],
Vars3 = Vars2#vars{no_bump_lines = NoBumpLines},
MungedBody1 =
maybe_fix_last_expr(MungedBody, Vars3, LastExprBumpLines),
MungedExprs1 = [MungedExpr|MungedBody1],
munge_body(Body, Vars3, MungedExprs1, NewBumps);
false ->
ets:insert(?COVER_TABLE, {#bump{module = Vars#vars.module,
function = Vars#vars.function,
arity = Vars#vars.arity,
clause = Vars#vars.clause,
line = Line},
0}),
Bump = bump_call(Vars, Line),
% Bump = {call, 0, {remote, 0, {atom,0,cover}, {atom,0,bump}},
% [{atom, 0, Vars#vars.module},
% {atom, 0, Vars#vars.function},
% {integer, 0, Vars#vars.arity},
% {integer, 0, Vars#vars.clause},
% {integer, 0, Line}]},
Lines2 = [Line|Lines],
{MungedExpr, Vars2} = munge_expr(Expr, Vars#vars{lines=Lines2}),
NewBumps = new_bumps(Vars2, Vars),
NoBumpLines = subtract(Vars2#vars.no_bump_lines, NewBumps),
Vars3 = Vars2#vars{no_bump_lines = NoBumpLines},
MungedBody1 =
maybe_fix_last_expr(MungedBody, Vars3, LastExprBumpLines),
MungedExprs1 = [MungedExpr,Bump|MungedBody1],
munge_body(Body, Vars3, MungedExprs1, NewBumps)
end;
munge_body([], Vars, MungedBody, _LastExprBumpLines) ->
{lists:reverse(MungedBody), Vars}.
%%% Fix last expression (OTP-8188). A typical example:
%%%
%%% 3: case X of
%%% 4: 1 -> a; % Bump line 5 after "a" has been evaluated!
%%% 5: 2 -> b; 3 -> c end, F()
%%%
%%% Line 5 wasn't bumped just before "F()" since it was already bumped
%%% before "b" (and before "c") (one mustn't bump a line more than
%%% once in a single "evaluation"). The expression "case X ... end" is
%%% now traversed again ("fixed"), this time adding bumps of line 5
%%% where appropriate, in this case when X matches 1.
%%%
%%% This doesn't solve all problems with expressions on the same line,
%%% though. 'case' and 'try' are tricky. An example:
%%%
%%% 7: case case X of 1 -> foo(); % ?
%%% 8: 2 -> bar() end of a -> 1;
%%% 9: b -> 2 end.
%%%
%%% If X matches 1 and foo() evaluates to a then line 8 should be
%%% bumped, but not if foo() evaluates to b. In other words, line 8
%%% cannot be bumped after "foo()" on line 7, so one has to bump line
%%% 8 before "begin 1 end". But if X matches 2 and bar evaluates to a
%%% then line 8 would be bumped twice (there has to be a bump before
%%% "bar()". It is like one would have to have two copies of the inner
%%% clauses, one for each outer clause. Maybe the munging should be
%%% done on some of the compiler's "lower level" format.
%%%
%%% 'fun' is also problematic since a bump inside the body "shadows"
%%% the rest of the line.
maybe_fix_last_expr(MungedExprs, Vars, LastExprBumpLines) ->
case last_expr_needs_fixing(Vars, LastExprBumpLines) of
{yes, Line} ->
fix_last_expr(MungedExprs, Line, Vars);
no ->
MungedExprs
end.
last_expr_needs_fixing(Vars, LastExprBumpLines) ->
case common_elems(Vars#vars.no_bump_lines, LastExprBumpLines) of
[Line] -> {yes, Line};
_ -> no
end.
fix_last_expr([MungedExpr|MungedExprs], Line, Vars) ->
%% No need to update ?COVER_TABLE.
Bump = bump_call(Vars, Line),
[fix_expr(MungedExpr, Line, Bump)|MungedExprs].
fix_expr({'if',L,Clauses}, Line, Bump) ->
FixedClauses = fix_clauses(Clauses, Line, Bump),
{'if',L,FixedClauses};
fix_expr({'case',L,Expr,Clauses}, Line, Bump) ->
FixedExpr = fix_expr(Expr, Line, Bump),
FixedClauses = fix_clauses(Clauses, Line, Bump),
{'case',L,FixedExpr,FixedClauses};
fix_expr({'receive',L,Clauses}, Line, Bump) ->
FixedClauses = fix_clauses(Clauses, Line, Bump),
{'receive',L,FixedClauses};
fix_expr({'receive',L,Clauses,Expr,Body}, Line, Bump) ->
FixedClauses = fix_clauses(Clauses, Line, Bump),
FixedExpr = fix_expr(Expr, Line, Bump),
FixedBody = fix_expr(Body, Line, Bump),
{'receive',L,FixedClauses,FixedExpr,FixedBody};
fix_expr({'try',L,Exprs,Clauses,CatchClauses,After}, Line, Bump) ->
FixedExprs = fix_expr(Exprs, Line, Bump),
FixedClauses = fix_clauses(Clauses, Line, Bump),
FixedCatchClauses = fix_clauses(CatchClauses, Line, Bump),
FixedAfter = fix_expr(After, Line, Bump),
{'try',L,FixedExprs,FixedClauses,FixedCatchClauses,FixedAfter};
fix_expr([E | Es], Line, Bump) ->
[fix_expr(E, Line, Bump) | fix_expr(Es, Line, Bump)];
fix_expr(T, Line, Bump) when is_tuple(T) ->
list_to_tuple(fix_expr(tuple_to_list(T), Line, Bump));
fix_expr(E, _Line, _Bump) ->
E.
fix_clauses([], _Line, _Bump) ->
[];
fix_clauses(Cs, Line, Bump) ->
case bumps_line(lists:last(Cs), Line) of
true ->
fix_cls(Cs, Line, Bump);
false ->
Cs
end.
fix_cls([], _Line, _Bump) ->
[];
fix_cls([Cl | Cls], Line, Bump) ->
case bumps_line(Cl, Line) of
true ->
[fix_expr(C, Line, Bump) || C <- [Cl | Cls]];
false ->
{clause,CL,P,G,Body} = Cl,
UniqueVarName = list_to_atom(lists:concat(["$cover$ ",Line])),
A = erl_anno:new(0),
V = {var,A,UniqueVarName},
[Last|Rest] = lists:reverse(Body),
Body1 = lists:reverse(Rest, [{match,A,V,Last},Bump,V]),
[{clause,CL,P,G,Body1} | fix_cls(Cls, Line, Bump)]
end.
bumps_line(E, L) ->
try bumps_line1(E, L) catch true -> true end.
bumps_line1({call,_,{remote,_,{atom,_,ets},{atom,_,update_counter}},
[{atom,_,?COVER_TABLE},{tuple,_,[_,_,_,_,_,{integer,_,Line}]},_]},
Line) ->
throw(true);
bumps_line1([E | Es], Line) ->
bumps_line1(E, Line),
bumps_line1(Es, Line);
bumps_line1(T, Line) when is_tuple(T) ->
bumps_line1(tuple_to_list(T), Line);
bumps_line1(_, _) ->
false.
%%% End of fix of last expression.
bump_call(Vars, Line) ->
A = erl_anno:new(0),
{call,A,{remote,A,{atom,A,ets},{atom,A,update_counter}},
[{atom,A,?COVER_TABLE},
{tuple,A,[{atom,A,?BUMP_REC_NAME},
{atom,A,Vars#vars.module},
{atom,A,Vars#vars.function},
{integer,A,Vars#vars.arity},
{integer,A,Vars#vars.clause},
{integer,A,Line}]},
{integer,A,1}]}.
munge_expr({match,Line,ExprL,ExprR}, Vars) ->
{MungedExprL, Vars2} = munge_expr(ExprL, Vars),
{MungedExprR, Vars3} = munge_expr(ExprR, Vars2),
{{match,Line,MungedExprL,MungedExprR}, Vars3};
munge_expr({tuple,Line,Exprs}, Vars) ->
{MungedExprs, Vars2} = munge_exprs(Exprs, Vars, []),
{{tuple,Line,MungedExprs}, Vars2};
munge_expr({record,Line,Name,Exprs}, Vars) ->
{MungedExprFields, Vars2} = munge_exprs(Exprs, Vars, []),
{{record,Line,Name,MungedExprFields}, Vars2};
munge_expr({record,Line,Arg,Name,Exprs}, Vars) ->
{MungedArg, Vars2} = munge_expr(Arg, Vars),
{MungedExprFields, Vars3} = munge_exprs(Exprs, Vars2, []),
{{record,Line,MungedArg,Name,MungedExprFields}, Vars3};
munge_expr({record_field,Line,ExprL,ExprR}, Vars) ->
{MungedExprR, Vars2} = munge_expr(ExprR, Vars),
{{record_field,Line,ExprL,MungedExprR}, Vars2};
munge_expr({map,Line,Fields}, Vars) ->
%% EEP 43
{MungedFields, Vars2} = munge_exprs(Fields, Vars, []),
{{map,Line,MungedFields}, Vars2};
munge_expr({map,Line,Arg,Fields}, Vars) ->
%% EEP 43
{MungedArg, Vars2} = munge_expr(Arg, Vars),
{MungedFields, Vars3} = munge_exprs(Fields, Vars2, []),
{{map,Line,MungedArg,MungedFields}, Vars3};
munge_expr({map_field_assoc,Line,Name,Value}, Vars) ->
%% EEP 43
{MungedName, Vars2} = munge_expr(Name, Vars),
{MungedValue, Vars3} = munge_expr(Value, Vars2),
{{map_field_assoc,Line,MungedName,MungedValue}, Vars3};
munge_expr({map_field_exact,Line,Name,Value}, Vars) ->
%% EEP 43
{MungedName, Vars2} = munge_expr(Name, Vars),
{MungedValue, Vars3} = munge_expr(Value, Vars2),
{{map_field_exact,Line,MungedName,MungedValue}, Vars3};
munge_expr({cons,Line,ExprH,ExprT}, Vars) ->
{MungedExprH, Vars2} = munge_expr(ExprH, Vars),
{MungedExprT, Vars3} = munge_expr(ExprT, Vars2),
{{cons,Line,MungedExprH,MungedExprT}, Vars3};
munge_expr({op,Line,Op,ExprL,ExprR}, Vars) ->
{MungedExprL, Vars2} = munge_expr(ExprL, Vars),
{MungedExprR, Vars3} = munge_expr(ExprR, Vars2),
{{op,Line,Op,MungedExprL,MungedExprR}, Vars3};
munge_expr({op,Line,Op,Expr}, Vars) ->
{MungedExpr, Vars2} = munge_expr(Expr, Vars),
{{op,Line,Op,MungedExpr}, Vars2};
munge_expr({'catch',Line,Expr}, Vars) ->
{MungedExpr, Vars2} = munge_expr(Expr, Vars),
{{'catch',Line,MungedExpr}, Vars2};
munge_expr({call,Line1,{remote,Line2,ExprM,ExprF},Exprs},
Vars) ->
{MungedExprM, Vars2} = munge_expr(ExprM, Vars),
{MungedExprF, Vars3} = munge_expr(ExprF, Vars2),
{MungedExprs, Vars4} = munge_exprs(Exprs, Vars3, []),
{{call,Line1,{remote,Line2,MungedExprM,MungedExprF},MungedExprs}, Vars4};
munge_expr({call,Line,Expr,Exprs}, Vars) ->
{MungedExpr, Vars2} = munge_expr(Expr, Vars),
{MungedExprs, Vars3} = munge_exprs(Exprs, Vars2, []),
{{call,Line,MungedExpr,MungedExprs}, Vars3};
munge_expr({lc,Line,Expr,Qs}, Vars) ->
{MungedExpr, Vars2} = munge_expr(?BLOCK1(Expr), Vars),
{MungedQs, Vars3} = munge_qualifiers(Qs, Vars2),
{{lc,Line,MungedExpr,MungedQs}, Vars3};
munge_expr({bc,Line,Expr,Qs}, Vars) ->
{bin,BLine,[{bin_element,EL,Val,Sz,TSL}|Es]} = Expr,
Expr2 = {bin,BLine,[{bin_element,EL,?BLOCK1(Val),Sz,TSL}|Es]},
{MungedExpr,Vars2} = munge_expr(Expr2, Vars),
{MungedQs, Vars3} = munge_qualifiers(Qs, Vars2),
{{bc,Line,MungedExpr,MungedQs}, Vars3};
munge_expr({block,Line,Body}, Vars) ->
{MungedBody, Vars2} = munge_body(Body, Vars),
{{block,Line,MungedBody}, Vars2};
munge_expr({'if',Line,Clauses}, Vars) ->
{MungedClauses,Vars2} = munge_clauses(Clauses, Vars),
{{'if',Line,MungedClauses}, Vars2};
munge_expr({'case',Line,Expr,Clauses}, Vars) ->
{MungedExpr,Vars2} = munge_expr(Expr, Vars),
{MungedClauses,Vars3} = munge_clauses(Clauses, Vars2),
{{'case',Line,MungedExpr,MungedClauses}, Vars3};
munge_expr({'receive',Line,Clauses}, Vars) ->
{MungedClauses,Vars2} = munge_clauses(Clauses, Vars),
{{'receive',Line,MungedClauses}, Vars2};
munge_expr({'receive',Line,Clauses,Expr,Body}, Vars) ->
{MungedExpr, Vars1} = munge_expr(Expr, Vars),
{MungedClauses,Vars2} = munge_clauses(Clauses, Vars1),
{MungedBody,Vars3} =
munge_body(Body, Vars2#vars{lines = Vars1#vars.lines}),
Vars4 = Vars3#vars{lines = Vars2#vars.lines ++ new_bumps(Vars3, Vars2)},
{{'receive',Line,MungedClauses,MungedExpr,MungedBody}, Vars4};
munge_expr({'try',Line,Body,Clauses,CatchClauses,After}, Vars) ->
{MungedBody, Vars1} = munge_body(Body, Vars),
{MungedClauses, Vars2} = munge_clauses(Clauses, Vars1),
{MungedCatchClauses, Vars3} = munge_clauses(CatchClauses, Vars2),
{MungedAfter, Vars4} = munge_body(After, Vars3),
{{'try',Line,MungedBody,MungedClauses,MungedCatchClauses,MungedAfter},
Vars4};
munge_expr({'fun',Line,{clauses,Clauses}}, Vars) ->
{MungedClauses,Vars2}=munge_clauses(Clauses, Vars),
{{'fun',Line,{clauses,MungedClauses}}, Vars2};
munge_expr({named_fun,Line,Name,Clauses}, Vars) ->
{MungedClauses,Vars2}=munge_clauses(Clauses, Vars),
{{named_fun,Line,Name,MungedClauses}, Vars2};
munge_expr({bin,Line,BinElements}, Vars) ->
{MungedBinElements,Vars2} = munge_exprs(BinElements, Vars, []),
{{bin,Line,MungedBinElements}, Vars2};
munge_expr({bin_element,Line,Value,Size,TypeSpecifierList}, Vars) ->
{MungedValue,Vars2} = munge_expr(Value, Vars),
{MungedSize,Vars3} = munge_expr(Size, Vars2),
{{bin_element,Line,MungedValue,MungedSize,TypeSpecifierList},Vars3};
munge_expr(Form, Vars) -> % var|char|integer|float|string|atom|nil|eof|default
{Form, Vars}.
munge_exprs([Expr|Exprs], Vars, MungedExprs) when Vars#vars.is_guard=:=true,
is_list(Expr) ->
{MungedExpr, _Vars} = munge_exprs(Expr, Vars, []),
munge_exprs(Exprs, Vars, [MungedExpr|MungedExprs]);
munge_exprs([Expr|Exprs], Vars, MungedExprs) ->
{MungedExpr, Vars2} = munge_expr(Expr, Vars),
munge_exprs(Exprs, Vars2, [MungedExpr|MungedExprs]);
munge_exprs([], Vars, MungedExprs) ->
{lists:reverse(MungedExprs), Vars}.
%% Every qualifier is decorated with a counter.
munge_qualifiers(Qualifiers, Vars) ->
munge_qs(Qualifiers, Vars, []).
munge_qs([{generate,Line,Pattern,Expr}|Qs], Vars, MQs) ->
L = element(2, Expr),
{MungedExpr, Vars2} = munge_expr(Expr, Vars),
munge_qs1(Qs, L, {generate,Line,Pattern,MungedExpr}, Vars, Vars2, MQs);
munge_qs([{b_generate,Line,Pattern,Expr}|Qs], Vars, MQs) ->
L = element(2, Expr),
{MExpr, Vars2} = munge_expr(Expr, Vars),
munge_qs1(Qs, L, {b_generate,Line,Pattern,MExpr}, Vars, Vars2, MQs);
munge_qs([Expr|Qs], Vars, MQs) ->
L = element(2, Expr),
{MungedExpr, Vars2} = munge_expr(Expr, Vars),
munge_qs1(Qs, L, MungedExpr, Vars, Vars2, MQs);
munge_qs([], Vars, MQs) ->
{lists:reverse(MQs), Vars}.
munge_qs1(Qs, Line, NQ, Vars, Vars2, MQs) ->
case new_bumps(Vars2, Vars) of
[_] ->
munge_qs(Qs, Vars2, [NQ | MQs]);
_ ->
{MungedTrue, Vars3} = munge_expr(?BLOCK({atom,Line,true}), Vars2),
munge_qs(Qs, Vars3, [NQ, MungedTrue | MQs])
end.
new_bumps(#vars{lines = New}, #vars{lines = Old}) ->
subtract(New, Old).
subtract(L1, L2) ->
[E || E <- L1, not lists:member(E, L2)].
common_elems(L1, L2) ->
[E || E <- L1, lists:member(E, L2)].
%%%--Analysis------------------------------------------------------------
%% Collect data for all modules
collect(Nodes) ->
%% local node
AllClauses = ets:tab2list(?COVER_CLAUSE_TABLE),
Mon1 = spawn_monitor(fun() -> pmap(fun move_modules/1,AllClauses) end),
%% remote nodes
Mon2 = spawn_monitor(fun() -> remote_collect('_',Nodes,false) end),
get_downs([Mon1,Mon2]).
%% Collect data for a list of modules
collect(Modules,Nodes) ->
MS = [{{'$1','_'},[{'==','$1',M}],['$_']} || M <- Modules],
Clauses = ets:select(?COVER_CLAUSE_TABLE,MS),
Mon1 = spawn_monitor(fun() -> pmap(fun move_modules/1,Clauses) end),
%% remote nodes
Mon2 = spawn_monitor(fun() -> remote_collect('_',Nodes,false) end),
get_downs([Mon1,Mon2]).
%% Collect data for one module
collect(Module,Clauses,Nodes) ->
%% local node
move_modules({Module,Clauses}),
%% remote nodes
remote_collect([Module],Nodes,false).
%% When analysing, the data from the local ?COVER_TABLE is moved to the
%% ?COLLECTION_TABLE. Resetting data in ?COVER_TABLE
move_modules({Module,Clauses}) ->
ets:insert(?COLLECTION_CLAUSE_TABLE,{Module,Clauses}),
Pattern = {#bump{module=Module, _='_'}, '_'},
MatchSpec = [{Pattern,[],['$_']}],
Match = ets:select(?COVER_TABLE,MatchSpec,?CHUNK_SIZE),
do_move_module(Match).
do_move_module({Bumps,Continuation}) ->
lists:foreach(fun({Key,Val}) ->
ets:insert(?COVER_TABLE, {Key,0}),
insert_in_collection_table(Key,Val)
end,
Bumps),
do_move_module(ets:select(Continuation));
do_move_module('$end_of_table') ->
ok.
%% Given a .beam file, find the .erl file. Look first in same directory as
%% the .beam file, then in ../src, then in compile info.
find_source(Module, File0) ->
try
Root = filename:rootname(File0, ".beam"),
Root == File0 andalso throw(File0), %% not .beam
%% Look for .erl in pwd.
File = Root ++ ".erl",
throw_file(File),
%% Not in pwd: look in ../src.
BeamDir = filename:dirname(File),
Base = filename:basename(File),
throw_file(filename:join([BeamDir, "..", "src", Base])),
%% Not in ../src: look for source path in compile info, but
%% first look relative the beam directory.
Info = lists:keyfind(source, 1, Module:module_info(compile)),
false == Info andalso throw({beam, File0}), %% stripped
{source, SrcFile} = Info,
throw_file(splice(BeamDir, SrcFile)), %% below ../src
throw_file(SrcFile), %% or absolute
%% No success means that source is either not under ../src or
%% its relative path differs from that of compile info. (For
%% example, compiled under src/x but installed under src/y.)
%% An option to specify an arbitrary source path explicitly is
%% probably a better solution than either more heuristics or a
%% potentially slow filesystem search.
{beam, File0}
catch
Path -> Path
end.
throw_file(Path) ->
false /= Path andalso filelib:is_file(Path) andalso throw(Path).
%% Splice the tail of a source path, starting from the last "src"
%% component, onto the parent of a beam directory, or return false if
%% no "src" component is found.
%%
%% Eg. splice("/path/to/app-1.0/ebin", "/compiled/path/to/app/src/x/y.erl")
%% --> "/path/to/app-1.0/ebin/../src/x/y.erl"
%%
%% This handles the case of source in subdirectories of ../src with
%% beams that have moved since compilation.
%%
splice(BeamDir, SrcFile) ->
case lists:splitwith(fun(C) -> C /= "src" end, revsplit(SrcFile)) of
{T, [_|_]} -> %% found src component
filename:join([BeamDir, "..", "src" | lists:reverse(T)]);
{_, []} -> %% or not
false
end.
revsplit(Path) ->
lists:reverse(filename:split(Path)).
analyse_list(Modules, Analysis, Level, State) ->
{LoadedMF, ImportedMF, Error} = are_loaded(Modules, State, [], [], []),
Loaded = [M || {M,_} <- LoadedMF],
Imported = [M || {M,_} <- ImportedMF],
collect(Loaded, State#main_state.nodes),
MS = [{{'$1','_'},[{'==','$1',M}],['$_']} || M <- Loaded ++ Imported],
AllClauses = ets:select(?COLLECTION_CLAUSE_TABLE,MS),
Fun = fun({Module,Clauses}) ->
do_analyse(Module, Analysis, Level, Clauses)
end,
{result, lists:flatten(pmap(Fun, AllClauses)), Error}.
analyse_all(Analysis, Level, State) ->
collect(State#main_state.nodes),
AllClauses = ets:tab2list(?COLLECTION_CLAUSE_TABLE),
Fun = fun({Module,Clauses}) ->
do_analyse(Module, Analysis, Level, Clauses)
end,
{result, lists:flatten(pmap(Fun, AllClauses)), []}.
do_parallel_analysis(Module, Analysis, Level, Loaded, From, State) ->
analyse_info(Module,State#main_state.imported),
C = case Loaded of
{loaded, _File} ->
[{Module,Clauses}] =
ets:lookup(?COVER_CLAUSE_TABLE,Module),
collect(Module,Clauses,State#main_state.nodes),
Clauses;
_ ->
[{Module,Clauses}] =
ets:lookup(?COLLECTION_CLAUSE_TABLE,Module),
Clauses
end,
R = do_analyse(Module, Analysis, Level, C),
reply(From, {ok,R}).
%% do_analyse(Module, Analysis, Level, Clauses)-> {ok,Answer} | {error,Error}
%% Clauses = [{Module,Function,Arity,Clause,Lines}]
do_analyse(Module, Analysis, line, _Clauses) ->
Pattern = {#bump{module=Module},'_'},
Bumps = ets:match_object(?COLLECTION_TABLE, Pattern),
Fun = case Analysis of
coverage ->
fun({#bump{line=L}, 0}) ->
{{Module,L}, {0,1}};
({#bump{line=L}, _N}) ->
{{Module,L}, {1,0}}
end;
calls ->
fun({#bump{line=L}, N}) ->
{{Module,L}, N}
end
end,
lists:keysort(1, lists:map(Fun, Bumps));
do_analyse(Module, Analysis, clause, _Clauses) ->
Pattern = {#bump{module=Module},'_'},
Bumps = lists:keysort(1,ets:match_object(?COLLECTION_TABLE, Pattern)),
analyse_clause(Analysis,Bumps);
do_analyse(Module, Analysis, function, Clauses) ->
ClauseResult = do_analyse(Module, Analysis, clause, Clauses),
merge_clauses(ClauseResult, merge_fun(Analysis));
do_analyse(Module, Analysis, module, Clauses) ->
FunctionResult = do_analyse(Module, Analysis, function, Clauses),
Result = merge_functions(FunctionResult, merge_fun(Analysis)),
{Module,Result}.
analyse_clause(_,[]) ->
[];
analyse_clause(coverage,
[{#bump{module=M,function=F,arity=A,clause=C},_}|_]=Bumps) ->
analyse_clause_cov(Bumps,{M,F,A,C},0,0,[]);
analyse_clause(calls,Bumps) ->
analyse_clause_calls(Bumps,{x,x,x,x},[]).
analyse_clause_cov([{#bump{module=M,function=F,arity=A,clause=C},N}|Bumps],
{M,F,A,C}=Clause,Ls,NotCov,Acc) ->
analyse_clause_cov(Bumps,Clause,Ls+1,if N==0->NotCov+1; true->NotCov end,Acc);
analyse_clause_cov([{#bump{module=M1,function=F1,arity=A1,clause=C1},_}|_]=Bumps,
Clause,Ls,NotCov,Acc) ->
analyse_clause_cov(Bumps,{M1,F1,A1,C1},0,0,[{Clause,{Ls-NotCov,NotCov}}|Acc]);
analyse_clause_cov([],Clause,Ls,NotCov,Acc) ->
lists:reverse(Acc,[{Clause,{Ls-NotCov,NotCov}}]).
analyse_clause_calls([{#bump{module=M,function=F,arity=A,clause=C},_}|Bumps],
{M,F,A,C}=Clause,Acc) ->
analyse_clause_calls(Bumps,Clause,Acc);
analyse_clause_calls([{#bump{module=M1,function=F1,arity=A1,clause=C1},N}|Bumps],
_Clause,Acc) ->
analyse_clause_calls(Bumps,{M1,F1,A1,C1},[{{M1,F1,A1,C1},N}|Acc]);
analyse_clause_calls([],_Clause,Acc) ->
lists:reverse(Acc).
merge_fun(coverage) ->
fun({Cov1,NotCov1}, {Cov2,NotCov2}) ->
{Cov1+Cov2, NotCov1+NotCov2}
end;
merge_fun(calls) ->
fun(Calls1, Calls2) ->
Calls1+Calls2
end.
merge_clauses(Clauses, MFun) -> merge_clauses(Clauses, MFun, []).
merge_clauses([{{M,F,A,_C1},R1},{{M,F,A,C2},R2}|Clauses], MFun, Result) ->
merge_clauses([{{M,F,A,C2},MFun(R1,R2)}|Clauses], MFun, Result);
merge_clauses([{{M,F,A,_C},R}|Clauses], MFun, Result) ->
merge_clauses(Clauses, MFun, [{{M,F,A},R}|Result]);
merge_clauses([], _Fun, Result) ->
lists:reverse(Result).
merge_functions([{_MFA,R}|Functions], MFun) ->
merge_functions(Functions, MFun, R);
merge_functions([],_MFun) -> % There are no clauses.
{0,0}. % No function can be covered or notcov.
merge_functions([{_MFA,R}|Functions], MFun, Result) ->
merge_functions(Functions, MFun, MFun(Result, R));
merge_functions([], _MFun, Result) ->
Result.
analyse_list_to_file(Modules, Opts, State) ->
{LoadedMF, ImportedMF, Error} = are_loaded(Modules, State, [], [], []),
collect([M || {M,_} <- LoadedMF], State#main_state.nodes),
OutDir = proplists:get_value(outdir,Opts),
HTML = lists:member(html,Opts),
Fun = fun({Module,File}) ->
OutFile = outfilename(OutDir,Module,HTML),
do_analyse_to_file(Module,File,OutFile,HTML,State)
end,
{Ok,Error1} = split_ok_error(pmap(Fun, LoadedMF++ImportedMF),[],[]),
{result,Ok,Error ++ Error1}.
analyse_all_to_file(Opts, State) ->
collect(State#main_state.nodes),
AllModules = get_all_modules(State),
OutDir = proplists:get_value(outdir,Opts),
HTML = lists:member(html,Opts),
Fun = fun({Module,File}) ->
OutFile = outfilename(OutDir,Module,HTML),
do_analyse_to_file(Module,File,OutFile,HTML,State)
end,
{Ok,Error} = split_ok_error(pmap(Fun, AllModules),[],[]),
{result,Ok,Error}.
get_all_modules(State) ->
get_all_modules(State#main_state.compiled ++ State#main_state.imported,[]).
get_all_modules([{Module,File}|Rest],Acc) ->
get_all_modules(Rest,[{Module,File}|Acc]);
get_all_modules([{Module,File,_}|Rest],Acc) ->
case lists:keymember(Module,1,Acc) of
true -> get_all_modules(Rest,Acc);
false -> get_all_modules(Rest,[{Module,File}|Acc])
end;
get_all_modules([],Acc) ->
Acc.
split_ok_error([{ok,R}|Result],Ok,Error) ->
split_ok_error(Result,[R|Ok],Error);
split_ok_error([{error,R}|Result],Ok,Error) ->
split_ok_error(Result,Ok,[R|Error]);
split_ok_error([],Ok,Error) ->
{Ok,Error}.
do_parallel_analysis_to_file(Module, Opts, Loaded, From, State) ->
File = case Loaded of
{loaded, File0} ->
[{Module,Clauses}] =
ets:lookup(?COVER_CLAUSE_TABLE,Module),
collect(Module, Clauses,
State#main_state.nodes),
File0;
{imported, File0, _} ->
File0
end,
HTML = lists:member(html,Opts),
OutFile =
case proplists:get_value(outfile,Opts) of
undefined ->
outfilename(proplists:get_value(outdir,Opts),Module,HTML);
F ->
F
end,
reply(From, do_analyse_to_file(Module,File,OutFile,HTML,State)).
do_analyse_to_file(Module,File,OutFile,HTML,State) ->
case find_source(Module, File) of
{beam,_BeamFile} ->
{error,{no_source_code_found,Module}};
ErlFile ->
analyse_info(Module,State#main_state.imported),
do_analyse_to_file1(Module,OutFile,ErlFile,HTML)
end.
%% do_analyse_to_file1(Module,OutFile,ErlFile) -> {ok,OutFile} | {error,Error}
%% Module = atom()
%% OutFile = ErlFile = string()
do_analyse_to_file1(Module, OutFile, ErlFile, HTML) ->
case file:open(ErlFile, [read,raw,read_ahead]) of
{ok, InFd} ->
case file:open(OutFile, [write,raw,delayed_write]) of
{ok, OutFd} ->
if HTML ->
Encoding = encoding(ErlFile),
Header =
["<!DOCTYPE HTML PUBLIC "
"\"-//W3C//DTD HTML 3.2 Final//EN\">\n"
"<html>\n"
"<head>\n"
"<meta http-equiv=\"Content-Type\""
" content=\"text/html; charset=",
Encoding,"\"/>\n"
"<title>",OutFile,"</title>\n"
"</head>"
"<body style='background-color: white;"
" color: black'>\n"
"<pre>\n"],
file:write(OutFd,Header);
true -> ok
end,
%% Write some initial information to the output file
{{Y,Mo,D},{H,Mi,S}} = calendar:local_time(),
Timestamp =
io_lib:format("~p-~s-~s at ~s:~s:~s",
[Y,
string:right(integer_to_list(Mo), 2, $0),
string:right(integer_to_list(D), 2, $0),
string:right(integer_to_list(H), 2, $0),
string:right(integer_to_list(Mi), 2, $0),
string:right(integer_to_list(S), 2, $0)]),
file:write(OutFd,
["File generated from ",ErlFile," by COVER ",
Timestamp,"\n\n"
"**************************************"
"**************************************"
"\n\n"]),
Pattern = {#bump{module=Module,line='$1',_='_'},'$2'},
MS = [{Pattern,[],[{{'$1','$2'}}]}],
CovLines = lists:keysort(1,ets:select(?COLLECTION_TABLE, MS)),
print_lines(Module, CovLines, InFd, OutFd, 1, HTML),
if
HTML ->
file:write(OutFd, "</pre>\n</body>\n</html>\n");
true -> ok
end,
file:close(OutFd),
file:close(InFd),
{ok, OutFile};
{error, Reason} ->
{error, {file, OutFile, Reason}}
end;
{error, Reason} ->
{error, {file, ErlFile, Reason}}
end.
print_lines(Module, CovLines, InFd, OutFd, L, HTML) ->
case file:read_line(InFd) of
eof ->
ignore;
{ok,"%"++_=Line} -> %Comment line - not executed.
file:write(OutFd, [tab(),escape_lt_and_gt(Line, HTML)]),
print_lines(Module, CovLines, InFd, OutFd, L+1, HTML);
{ok,RawLine} ->
Line = escape_lt_and_gt(RawLine,HTML),
case CovLines of
[{L,N}|CovLines1] ->
%% N = lists:foldl(fun([Ni], Nacc) -> Nacc+Ni end, 0, Ns),
if
N=:=0, HTML=:=true ->
LineNoNL = Line -- "\n",
Str = " 0",
%%Str = string:right("0", 6, 32),
RedLine = ["<font color=red>",Str,fill1(),
LineNoNL,"</font>\n"],
file:write(OutFd, RedLine);
N<1000000 ->
Str = string:right(integer_to_list(N), 6, 32),
file:write(OutFd, [Str,fill1(),Line]);
N<10000000 ->
Str = integer_to_list(N),
file:write(OutFd, [Str,fill2(),Line]);
true ->
Str = integer_to_list(N),
file:write(OutFd, [Str,fill3(),Line])
end,
print_lines(Module, CovLines1, InFd, OutFd, L+1, HTML);
_ ->
file:write(OutFd, [tab(),Line]),
print_lines(Module, CovLines, InFd, OutFd, L+1, HTML)
end
end.
tab() -> " | ".
fill1() -> "..| ".
fill2() -> ".| ".
fill3() -> "| ".
%%%--Export--------------------------------------------------------------
do_export(Module, OutFile, From, State) ->
case file:open(OutFile,[write,binary,raw,delayed_write]) of
{ok,Fd} ->
Reply =
case Module of
'_' ->
export_info(State#main_state.imported),
collect(State#main_state.nodes),
do_export_table(State#main_state.compiled,
State#main_state.imported,
Fd);
_ ->
export_info(Module,State#main_state.imported),
try is_loaded(Module, State) of
{loaded, File} ->
[{Module,Clauses}] =
ets:lookup(?COVER_CLAUSE_TABLE,Module),
collect(Module, Clauses,
State#main_state.nodes),
do_export_table([{Module,File}],[],Fd);
{imported, File, ImportFiles} ->
%% don't know if I should allow this -
%% export a module which is only imported
Imported = [{Module,File,ImportFiles}],
do_export_table([],Imported,Fd)
catch throw:_ ->
{error,{not_cover_compiled,Module}}
end
end,
file:close(Fd),
reply(From, Reply);
{error,Reason} ->
reply(From, {error, {cant_open_file,OutFile,Reason}})
end.
do_export_table(Compiled, Imported, Fd) ->
ModList = merge(Imported,Compiled),
write_module_data(ModList,Fd).
merge([{Module,File,_ImportFiles}|Imported],ModuleList) ->
case lists:keymember(Module,1,ModuleList) of
true ->
merge(Imported,ModuleList);
false ->
merge(Imported,[{Module,File}|ModuleList])
end;
merge([],ModuleList) ->
ModuleList.
write_module_data([{Module,File}|ModList],Fd) ->
write({file,Module,File},Fd),
[Clauses] = ets:lookup(?COLLECTION_CLAUSE_TABLE,Module),
write(Clauses,Fd),
ModuleData = ets:match_object(?COLLECTION_TABLE,{#bump{module=Module},'_'}),
do_write_module_data(ModuleData,Fd),
write_module_data(ModList,Fd);
write_module_data([],_Fd) ->
ok.
do_write_module_data([H|T],Fd) ->
write(H,Fd),
do_write_module_data(T,Fd);
do_write_module_data([],_Fd) ->
ok.
write(Element,Fd) ->
Bin = term_to_binary(Element,[compressed]),
case byte_size(Bin) of
Size when Size > 255 ->
SizeBin = term_to_binary({'$size',Size}),
file:write(Fd,
<<(byte_size(SizeBin)):8,SizeBin/binary,Bin/binary>>);
Size ->
file:write(Fd,<<Size:8,Bin/binary>>)
end,
ok.
%%%--Import--------------------------------------------------------------
do_import_to_table(Fd,ImportFile,Imported) ->
do_import_to_table(Fd,ImportFile,Imported,[]).
do_import_to_table(Fd,ImportFile,Imported,DontImport) ->
case get_term(Fd) of
{file,Module,File} ->
case add_imported(Module, File, ImportFile, Imported) of
{ok,NewImported} ->
do_import_to_table(Fd,ImportFile,NewImported,DontImport);
dont_import ->
do_import_to_table(Fd,ImportFile,Imported,
[Module|DontImport])
end;
{Key=#bump{module=Module},Val} ->
case lists:member(Module,DontImport) of
false ->
insert_in_collection_table(Key,Val);
true ->
ok
end,
do_import_to_table(Fd,ImportFile,Imported,DontImport);
{Module,Clauses} ->
case lists:member(Module,DontImport) of
false ->
ets:insert(?COLLECTION_CLAUSE_TABLE,{Module,Clauses});
true ->
ok
end,
do_import_to_table(Fd,ImportFile,Imported,DontImport);
eof ->
Imported
end.
get_term(Fd) ->
case file:read(Fd,1) of
{ok,<<Size1:8>>} ->
{ok,Bin1} = file:read(Fd,Size1),
case binary_to_term(Bin1) of
{'$size',Size2} ->
{ok,Bin2} = file:read(Fd,Size2),
binary_to_term(Bin2);
Term ->
Term
end;
eof ->
eof
end.
%%%--Reset---------------------------------------------------------------
%% Reset main node and all remote nodes
do_reset_main_node(Module,Nodes) ->
do_reset(Module),
do_reset_collection_table(Module),
remote_reset(Module,Nodes).
do_reset_collection_table(Module) ->
ets:delete(?COLLECTION_CLAUSE_TABLE,Module),
ets:match_delete(?COLLECTION_TABLE, {#bump{module=Module},'_'}).
%% do_reset(Module) -> ok
%% The reset is done on ?CHUNK_SIZE number of bumps to avoid building
%% long lists in the case of very large modules
do_reset(Module) ->
Pattern = {#bump{module=Module, _='_'}, '$1'},
MatchSpec = [{Pattern,[{'=/=','$1',0}],['$_']}],
Match = ets:select(?COVER_TABLE,MatchSpec,?CHUNK_SIZE),
do_reset2(Match).
do_reset2({Bumps,Continuation}) ->
lists:foreach(fun({Bump,_N}) ->
ets:insert(?COVER_TABLE, {Bump,0})
end,
Bumps),
do_reset2(ets:select(Continuation));
do_reset2('$end_of_table') ->
ok.
do_clear(Module) ->
ets:match_delete(?COVER_CLAUSE_TABLE, {Module,'_'}),
ets:match_delete(?COVER_TABLE, {#bump{module=Module},'_'}),
case lists:member(?COLLECTION_TABLE, ets:all()) of
true ->
%% We're on the main node
ets:match_delete(?COLLECTION_TABLE, {#bump{module=Module},'_'});
false ->
ok
end.
not_loaded(Module, unloaded, State) ->
do_clear(Module),
remote_unload(State#main_state.nodes,[Module]),
Compiled = update_compiled([Module],
State#main_state.compiled),
State#main_state{ compiled = Compiled };
not_loaded(_Module,_Else, State) ->
State.
%%%--Div-----------------------------------------------------------------
escape_lt_and_gt(Rawline,HTML) when HTML =/= true ->
Rawline;
escape_lt_and_gt(Rawline,_HTML) ->
escape_lt_and_gt1(Rawline,[]).
escape_lt_and_gt1([$<|T],Acc) ->
escape_lt_and_gt1(T,[$;,$t,$l,$&|Acc]);
escape_lt_and_gt1([$>|T],Acc) ->
escape_lt_and_gt1(T,[$;,$t,$g,$&|Acc]);
escape_lt_and_gt1([$&|T],Acc) ->
escape_lt_and_gt1(T,[$;,$p,$m,$a,$&|Acc]);
escape_lt_and_gt1([],Acc) ->
lists:reverse(Acc);
escape_lt_and_gt1([H|T],Acc) ->
escape_lt_and_gt1(T,[H|Acc]).
%%%--Internal functions for parallelization------------------------------
pmap(Fun,List) ->
NTot = length(List),
NProcs = erlang:system_info(schedulers) * 2,
NPerProc = (NTot div NProcs) + 1,
Mons = pmap_spawn(Fun,NPerProc,List,[]),
pmap_collect(Mons,[]).
pmap_spawn(_,_,[],Mons) ->
Mons;
pmap_spawn(Fun,NPerProc,List,Mons) ->
{L1,L2} = if length(List)>=NPerProc -> lists:split(NPerProc,List);
true -> {List,[]} % last chunk
end,
Mon =
spawn_monitor(
fun() ->
exit({pmap_done,lists:map(Fun,L1)})
end),
pmap_spawn(Fun,NPerProc,L2,[Mon|Mons]).
pmap_collect([],Acc) ->
lists:append(Acc);
pmap_collect(Mons,Acc) ->
receive
{'DOWN', Ref, process, Pid, {pmap_done,Result}} ->
pmap_collect(lists:delete({Pid,Ref},Mons),[Result|Acc]);
{'DOWN', Ref, process, Pid, Reason} = Down ->
case lists:member({Pid,Ref},Mons) of
true ->
%% Something went really wrong - don't hang!
exit(Reason);
false ->
%% This should be handled somewhere else
self() ! Down,
pmap_collect(Mons,Acc)
end
end.
%%%-----------------------------------------------------------------
%%% Read encoding from source file
encoding(File) ->
Encoding =
case epp:read_encoding(File) of
none ->
epp:default_encoding();
E ->
E
end,
html_encoding(Encoding).
html_encoding(latin1) ->
"iso-8859-1";
html_encoding(utf8) ->
"utf-8".
