mirror of
https://github.com/processone/ejabberd.git
synced 2024-11-08 15:42:29 +01:00
dff6e28b2d
ram_file_io_server. Support definition of loglevels with integer or atom. (thanks to Geoff Cant)(EJAB-919) * src/dynamic_compile.erl: Added erlang module that converts string to binary loadable code by Mats Cronqvist, Chris Newcombe, and Jacob Vorreuter. * src/ram_file_io_server.erl: Remove file not longer useful. * src/ejabberd.app: Likewise SVN Revision: 2054
268 lines
14 KiB
Erlang
268 lines
14 KiB
Erlang
%% Copyright (c) 2007
|
|
%% Mats Cronqvist <mats.cronqvist@ericsson.com>
|
|
%% Chris Newcombe <chris.newcombe@gmail.com>
|
|
%% Jacob Vorreuter <jacob.vorreuter@gmail.com>
|
|
%%
|
|
%% Permission is hereby granted, free of charge, to any person
|
|
%% obtaining a copy of this software and associated documentation
|
|
%% files (the "Software"), to deal in the Software without
|
|
%% restriction, including without limitation the rights to use,
|
|
%% copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
%% copies of the Software, and to permit persons to whom the
|
|
%% Software is furnished to do so, subject to the following
|
|
%% conditions:
|
|
%%
|
|
%% The above copyright notice and this permission notice shall be
|
|
%% included in all copies or substantial portions of the Software.
|
|
%%
|
|
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
%% EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
|
%% OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
%% NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
%% HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
%% WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
%% FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
%% OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
%%%-------------------------------------------------------------------
|
|
%%% File : dynamic_compile.erl
|
|
%%% Description :
|
|
%%% Authors : Mats Cronqvist <mats.cronqvist@ericsson.com>
|
|
%%% Chris Newcombe <chris.newcombe@gmail.com>
|
|
%%% Jacob Vorreuter <jacob.vorreuter@gmail.com>
|
|
%%% TODO :
|
|
%%% - add support for limit include-file depth (and prevent circular references)
|
|
%%% prevent circular macro expansion set FILE correctly when -module() is found
|
|
%%% -include_lib support $ENVVAR in include filenames
|
|
%%% substitute-stringize (??MACRO)
|
|
%%% -undef/-ifdef/-ifndef/-else/-endif
|
|
%%% -file(File, Line)
|
|
%%%-------------------------------------------------------------------
|
|
-module(dynamic_compile).
|
|
|
|
%% API
|
|
-export([from_string/1, from_string/2]).
|
|
|
|
-import(lists, [reverse/1, keyreplace/4]).
|
|
|
|
%%====================================================================
|
|
%% API
|
|
%%====================================================================
|
|
%%--------------------------------------------------------------------
|
|
%% Function:
|
|
%% Description:
|
|
%% Returns a binary that can be used with
|
|
%% code:load_binary(Module, ModuleFilenameForInternalRecords, Binary).
|
|
%%--------------------------------------------------------------------
|
|
from_string(CodeStr) ->
|
|
from_string(CodeStr, []).
|
|
|
|
% takes Options as for compile:forms/2
|
|
from_string(CodeStr, CompileFormsOptions) ->
|
|
%% Initialise the macro dictionary with the default predefined macros,
|
|
%% (adapted from epp.erl:predef_macros/1
|
|
Filename = "compiled_from_string",
|
|
%%Machine = list_to_atom(erlang:system_info(machine)),
|
|
Ms0 = dict:new(),
|
|
% Ms1 = dict:store('FILE', {[], "compiled_from_string"}, Ms0),
|
|
% Ms2 = dict:store('LINE', {[], 1}, Ms1), % actually we might add special code for this
|
|
% Ms3 = dict:store('MODULE', {[], undefined}, Ms2),
|
|
% Ms4 = dict:store('MODULE_STRING', {[], undefined}, Ms3),
|
|
% Ms5 = dict:store('MACHINE', {[], Machine}, Ms4),
|
|
% InitMD = dict:store(Machine, {[], true}, Ms5),
|
|
InitMD = Ms0,
|
|
|
|
%% From the docs for compile:forms:
|
|
%% When encountering an -include or -include_dir directive, the compiler searches for header files in the following directories:
|
|
%% 1. ".", the current working directory of the file server;
|
|
%% 2. the base name of the compiled file;
|
|
%% 3. the directories specified using the i option. The directory specified last is searched first.
|
|
%% In this case, #2 is meaningless.
|
|
IncludeSearchPath = ["." | reverse([Dir || {i, Dir} <- CompileFormsOptions])],
|
|
{RevForms, _OutMacroDict} = scan_and_parse(CodeStr, Filename, 1, [], InitMD, IncludeSearchPath),
|
|
Forms = reverse(RevForms),
|
|
|
|
%% note: 'binary' is forced as an implicit option, whether it is provided or not.
|
|
case compile:forms(Forms, CompileFormsOptions) of
|
|
{ok, ModuleName, CompiledCodeBinary} when is_binary(CompiledCodeBinary) ->
|
|
{ModuleName, CompiledCodeBinary};
|
|
{ok, ModuleName, CompiledCodeBinary, []} when is_binary(CompiledCodeBinary) -> % empty warnings list
|
|
{ModuleName, CompiledCodeBinary};
|
|
{ok, _ModuleName, _CompiledCodeBinary, Warnings} ->
|
|
throw({?MODULE, warnings, Warnings});
|
|
Other ->
|
|
throw({?MODULE, compile_forms, Other})
|
|
end.
|
|
|
|
%%====================================================================
|
|
%% Internal functions
|
|
%%====================================================================
|
|
%%% Code from Mats Cronqvist
|
|
%%% See http://www.erlang.org/pipermail/erlang-questions/2007-March/025507.html
|
|
%%%## 'scan_and_parse'
|
|
%%%
|
|
%%% basically we call the OTP scanner and parser (erl_scan and
|
|
%%% erl_parse) line-by-line, but check each scanned line for (or
|
|
%%% definitions of) macros before parsing.
|
|
%% returns {ReverseForms, FinalMacroDict}
|
|
scan_and_parse([], _CurrFilename, _CurrLine, RevForms, MacroDict, _IncludeSearchPath) ->
|
|
{RevForms, MacroDict};
|
|
|
|
scan_and_parse(RemainingText, CurrFilename, CurrLine, RevForms, MacroDict, IncludeSearchPath) ->
|
|
case scanner(RemainingText, CurrLine, MacroDict) of
|
|
{tokens, NLine, NRemainingText, Toks} ->
|
|
{ok, Form} = erl_parse:parse_form(Toks),
|
|
scan_and_parse(NRemainingText, CurrFilename, NLine, [Form | RevForms], MacroDict, IncludeSearchPath);
|
|
{macro, NLine, NRemainingText, NMacroDict} ->
|
|
scan_and_parse(NRemainingText, CurrFilename, NLine, RevForms,NMacroDict, IncludeSearchPath);
|
|
{include, NLine, NRemainingText, IncludeFilename} ->
|
|
IncludeFileRemainingTextents = read_include_file(IncludeFilename, IncludeSearchPath),
|
|
%%io:format("include file ~p contents: ~n~p~nRemainingText = ~p~n", [IncludeFilename,IncludeFileRemainingTextents, RemainingText]),
|
|
%% Modify the FILE macro to reflect the filename
|
|
%%IncludeMacroDict = dict:store('FILE', {[],IncludeFilename}, MacroDict),
|
|
IncludeMacroDict = MacroDict,
|
|
|
|
%% Process the header file (inc. any nested header files)
|
|
{RevIncludeForms, IncludedMacroDict} = scan_and_parse(IncludeFileRemainingTextents, IncludeFilename, 1, [], IncludeMacroDict, IncludeSearchPath),
|
|
%io:format("include file results = ~p~n", [R]),
|
|
%% Restore the FILE macro in the NEW MacroDict (so we keep any macros defined in the header file)
|
|
%%NMacroDict = dict:store('FILE', {[],CurrFilename}, IncludedMacroDict),
|
|
NMacroDict = IncludedMacroDict,
|
|
|
|
%% Continue with the original file
|
|
scan_and_parse(NRemainingText, CurrFilename, NLine, RevIncludeForms ++ RevForms, NMacroDict, IncludeSearchPath);
|
|
done ->
|
|
scan_and_parse([], CurrFilename, CurrLine, RevForms, MacroDict, IncludeSearchPath)
|
|
end.
|
|
|
|
scanner(Text, Line, MacroDict) ->
|
|
case erl_scan:tokens([],Text,Line) of
|
|
{done, {ok,Toks,NLine}, LeftOverChars} ->
|
|
case pre_proc(Toks, MacroDict) of
|
|
{tokens, NToks} -> {tokens, NLine, LeftOverChars, NToks};
|
|
{macro, NMacroDict} -> {macro, NLine, LeftOverChars, NMacroDict};
|
|
{include, Filename} -> {include, NLine, LeftOverChars, Filename}
|
|
end;
|
|
{more, _Continuation} ->
|
|
%% This is supposed to mean "term is not yet complete" (i.e. a '.' has
|
|
%% not been reached yet).
|
|
%% However, for some bizarre reason we also get this if there is a comment after the final '.' in a file.
|
|
%% So we check to see if Text only consists of comments.
|
|
case is_only_comments(Text) of
|
|
true ->
|
|
done;
|
|
false ->
|
|
throw({incomplete_term, Text, Line})
|
|
end
|
|
end.
|
|
|
|
is_only_comments(Text) -> is_only_comments(Text, not_in_comment).
|
|
|
|
is_only_comments([], _) -> true;
|
|
is_only_comments([$ |T], not_in_comment) -> is_only_comments(T, not_in_comment); % skipping whitspace outside of comment
|
|
is_only_comments([$\t |T], not_in_comment) -> is_only_comments(T, not_in_comment); % skipping whitspace outside of comment
|
|
is_only_comments([$\n |T], not_in_comment) -> is_only_comments(T, not_in_comment); % skipping whitspace outside of comment
|
|
is_only_comments([$% |T], not_in_comment) -> is_only_comments(T, in_comment); % found start of a comment
|
|
is_only_comments(_, not_in_comment) -> false;
|
|
% found any significant char NOT in a comment
|
|
is_only_comments([$\n |T], in_comment) -> is_only_comments(T, not_in_comment); % found end of a comment
|
|
is_only_comments([_ |T], in_comment) -> is_only_comments(T, in_comment). % skipping over in-comment chars
|
|
|
|
%%%## 'pre-proc'
|
|
%%%
|
|
%%% have to implement a subset of the pre-processor, since epp insists
|
|
%%% on running on a file.
|
|
%%% only handles 2 cases;
|
|
%% -define(MACRO, something).
|
|
%% -define(MACRO(VAR1,VARN),{stuff,VAR1,more,stuff,VARN,extra,stuff}).
|
|
pre_proc([{'-',_},{atom,_,define},{'(',_},{_,_,Name}|DefToks],MacroDict) ->
|
|
false = dict:is_key(Name, MacroDict),
|
|
case DefToks of
|
|
[{',',_} | Macro] ->
|
|
{macro, dict:store(Name, {[], macro_body_def(Macro, [])}, MacroDict)};
|
|
[{'(',_} | Macro] ->
|
|
{macro, dict:store(Name, macro_params_body_def(Macro, []), MacroDict)}
|
|
end;
|
|
|
|
pre_proc([{'-',_}, {atom,_,include}, {'(',_}, {string,_,Filename}, {')',_}, {dot,_}], _MacroDict) ->
|
|
{include, Filename};
|
|
|
|
pre_proc(Toks,MacroDict) ->
|
|
{tokens, subst_macros(Toks, MacroDict)}.
|
|
|
|
macro_params_body_def([{')',_},{',',_} | Toks], RevParams) ->
|
|
{reverse(RevParams), macro_body_def(Toks, [])};
|
|
macro_params_body_def([{var,_,Param} | Toks], RevParams) ->
|
|
macro_params_body_def(Toks, [Param | RevParams]);
|
|
macro_params_body_def([{',',_}, {var,_,Param} | Toks], RevParams) ->
|
|
macro_params_body_def(Toks, [Param | RevParams]).
|
|
|
|
macro_body_def([{')',_}, {dot,_}], RevMacroBodyToks) ->
|
|
reverse(RevMacroBodyToks);
|
|
macro_body_def([Tok|Toks], RevMacroBodyToks) ->
|
|
macro_body_def(Toks, [Tok | RevMacroBodyToks]).
|
|
|
|
subst_macros(Toks, MacroDict) ->
|
|
reverse(subst_macros_rev(Toks, MacroDict, [])).
|
|
|
|
%% returns a reversed list of tokes
|
|
subst_macros_rev([{'?',_}, {_,LineNum,'LINE'} | Toks], MacroDict, RevOutToks) ->
|
|
%% special-case for ?LINE, to avoid creating a new MacroDict for every line in the source file
|
|
subst_macros_rev(Toks, MacroDict, [{integer,LineNum,LineNum}] ++ RevOutToks);
|
|
|
|
subst_macros_rev([{'?',_}, {_,_,Name}, {'(',_} = Paren | Toks], MacroDict, RevOutToks) ->
|
|
case dict:fetch(Name, MacroDict) of
|
|
{[], MacroValue} ->
|
|
%% This macro does not have any vars, so ignore the fact that the invocation is followed by "(...stuff"
|
|
%% Recursively expand any macro calls inside this macro's value
|
|
%% TODO: avoid infinite expansion due to circular references (even indirect ones)
|
|
RevExpandedOtherMacrosToks = subst_macros_rev(MacroValue, MacroDict, []),
|
|
subst_macros_rev([Paren|Toks], MacroDict, RevExpandedOtherMacrosToks ++ RevOutToks);
|
|
ParamsAndBody ->
|
|
%% This macro does have vars.
|
|
%% Collect all of the passe arguments, in an ordered list
|
|
{NToks, Arguments} = subst_macros_get_args(Toks, []),
|
|
%% Expand the varibles
|
|
ExpandedParamsToks = subst_macros_subst_args_for_vars(ParamsAndBody, Arguments),
|
|
%% Recursively expand any macro calls inside this macro's value
|
|
%% TODO: avoid infinite expansion due to circular references (even indirect ones)
|
|
RevExpandedOtherMacrosToks = subst_macros_rev(ExpandedParamsToks, MacroDict, []),
|
|
subst_macros_rev(NToks, MacroDict, RevExpandedOtherMacrosToks ++ RevOutToks)
|
|
end;
|
|
|
|
subst_macros_rev([{'?',_}, {_,_,Name} | Toks], MacroDict, RevOutToks) ->
|
|
%% This macro invocation does not have arguments.
|
|
%% Therefore the definition should not have parameters
|
|
{[], MacroValue} = dict:fetch(Name, MacroDict),
|
|
|
|
%% Recursively expand any macro calls inside this macro's value
|
|
%% TODO: avoid infinite expansion due to circular references (even indirect ones)
|
|
RevExpandedOtherMacrosToks = subst_macros_rev(MacroValue, MacroDict, []),
|
|
subst_macros_rev(Toks, MacroDict, RevExpandedOtherMacrosToks ++ RevOutToks);
|
|
|
|
subst_macros_rev([Tok|Toks], MacroDict, RevOutToks) ->
|
|
subst_macros_rev(Toks, MacroDict, [Tok|RevOutToks]);
|
|
subst_macros_rev([], _MacroDict, RevOutToks) -> RevOutToks.
|
|
|
|
subst_macros_get_args([{')',_} | Toks], RevArgs) ->
|
|
{Toks, reverse(RevArgs)};
|
|
subst_macros_get_args([{',',_}, {var,_,ArgName} | Toks], RevArgs) ->
|
|
subst_macros_get_args(Toks, [ArgName| RevArgs]);
|
|
subst_macros_get_args([{var,_,ArgName} | Toks], RevArgs) ->
|
|
subst_macros_get_args(Toks, [ArgName | RevArgs]).
|
|
|
|
subst_macros_subst_args_for_vars({[], BodyToks}, []) ->
|
|
BodyToks;
|
|
subst_macros_subst_args_for_vars({[Param | Params], BodyToks}, [Arg|Args]) ->
|
|
NBodyToks = keyreplace(Param, 3, BodyToks, {var,1,Arg}),
|
|
subst_macros_subst_args_for_vars({Params, NBodyToks}, Args).
|
|
|
|
read_include_file(Filename, IncludeSearchPath) ->
|
|
case file:path_open(IncludeSearchPath, Filename, [read, raw, binary]) of
|
|
{ok, IoDevice, FullName} ->
|
|
{ok, Data} = file:read(IoDevice, filelib:file_size(FullName)),
|
|
file:close(IoDevice),
|
|
binary_to_list(Data);
|
|
{error, Reason} ->
|
|
throw({failed_to_read_include_file, Reason, Filename, IncludeSearchPath})
|
|
end. |