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xmpp.chapril.org-ejabberd/src/dynamic_compile.erl

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%% 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.
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