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Basic implementation of port compiler is now complete
This commit is contained in:
Dave Smith
parent
dbd576fc33
commit
d885b1c04c
1 changed files with 171 additions and 76 deletions
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@ -33,13 +33,42 @@
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%% Public API
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%% ===================================================================
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%% Port driver name - determined by app name
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%% Source files (or c_src/*.c by default)
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%% Pre-compile hook (optional)
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%% Env variables
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%% Supported configuration variables:
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%%
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%% * port_sources - Erlang list of files and/or wildcard strings to be compiled
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%%
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%% * port_envs - Erlang list of key/value pairs which will control the environment when
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%% running the compiler and linker. By default, the following variables
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%% are defined:
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%% CC - C compiler
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%% CXX - C++ compiler
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%% CFLAGS - C compiler
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%% CXXFLAGS - C++ compiler
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%% LDFLAGS - Link flags
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%% DRIVER_CFLAGS - default -I paths for erts and ei
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%% DRIVER_LDFLAGS - default -L and -lerl_interface -lei
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%%
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%% Note that if you wish to extend (vs. replace) these variables, you MUST
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%% include a shell-style reference in your definition. E.g. to extend CFLAGS,
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%% do something like:
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%%
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%% {port_envs, [{"CFLAGS", "$CFLAGS -MyOtherOptions"}]}
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%%
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%% It is also possible to specify platform specific options by specifying a triplet
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%% where the first string is a regex that is checked against erlang's system architecture
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%% string. E.g. to specify a CFLAG that only applies to x86_64 on linux do:
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%%
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%% {port_envs, [{"x86_64.*-linux", "CFLAGS", "$CFLAGS -X86Options"}]}
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%%
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%% * port_pre_script - Tuple which specifies a pre-compilation script to run, and a filename that
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%% exists as a result of the script running.
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%%
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%% * port_cleanup_script - String that specifies a script to run during cleanup. Use this to remove
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%% files/directories created by port_pre_script.
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%%
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compile(Config, _AppFile) ->
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%% Compose list of sources from config file -- default to c_src/*.c
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compile(Config, AppFile) ->
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%% Compose list of sources from config file -- defaults to c_src/*.c
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Sources = expand_sources(rebar_config:get_list(Config, port_sources, ["c_src/*.c"]), []),
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case Sources of
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[] ->
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@ -47,24 +76,44 @@ compile(Config, _AppFile) ->
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_ ->
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%% Extract environment values from the config (if specified) and merge with the
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%% default for this operating system. This enables max flexibility for users.
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OperatingSystem = rebar_utils:get_os(),
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DefaultEnvs = driver_envs() ++ default_envs(OperatingSystem),
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OverrideEnvs = rebar_config:get_list(Config, port_env, []),
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DefaultEnvs = filter_envs(default_env(), []),
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OverrideEnvs = filter_envs(rebar_config:get_list(Config, port_envs, []), []),
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Env = merge_envs(OverrideEnvs, DefaultEnvs),
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%% One or more files are available for building. Run the pre-compile hook, if necessary.
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% run_precompile_hook(Config),
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%% One or more files are available for building. Run the pre-compile hook, if
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%% necessary.
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run_precompile_hook(Config, Env),
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%% Compile each of the sources
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compile_each(Sources, [], Config, Env),
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ok
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{NewBins, ExistingBins} = compile_each(Sources, Config, Env, [], []),
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%% Finally, link everything together
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% do_link(Config, AppFile, Bins)
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%% Construct the driver name and make sure priv/ exists
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SoName = so_name(AppFile),
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ok = filelib:ensure_dir(SoName),
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%% Only relink if necessary, given the SoName and list of new binaries
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case needs_link(SoName, NewBins) of
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true ->
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AllBins = string:join(NewBins ++ ExistingBins, " "),
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rebar_utils:sh_failfast(?FMT("$CC ~s $LDFLAGS $DRIVER_LDFLAGS -o ~s", [AllBins, SoName]), Env);
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false ->
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?INFO("Skipping relink of ~s\n", [SoName]),
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ok
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end
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end.
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clean(Config, _AppFile) ->
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ok.
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clean(Config, AppFile) ->
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%% Build a list of sources so as to derive all the bins we generated
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Sources = expand_sources(rebar_config:get_list(Config, port_sources, ["c_src/*.c"]), []),
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rebar_file_utils:delete_each([source_to_bin(S) || S <- Sources]),
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%% Delete the .so file
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rebar_file_utils:delete_each([so_name(AppFile)]),
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%% Run the cleanup script, if it exists
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run_cleanup_hook(Config).
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%% ===================================================================
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@ -77,34 +126,50 @@ expand_sources([Spec | Rest], Acc) ->
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Acc2 = filelib:wildcard(Spec) ++ Acc,
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expand_sources(Rest, Acc2).
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run_precompile_hook(Config, Env) ->
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case rebar_config:get(Config, port_pre_script, undefined) of
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undefined ->
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ok;
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{Script, BypassFileName} ->
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case filelib:is_regular(BypassFileName) of
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false ->
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?CONSOLE("Running ~s\n", [Script]),
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rebar_utils:sh_failfast(Script, Env);
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true ->
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?INFO("~s exists; not running ~s\n", [BypassFileName, Script])
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end
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end.
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%% CC - C compiler
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%% CXX - C++ compiler
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%% CFLAGS - C compiler
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%% CXXFLAGS - C++ compiler
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%% LDFLAGS - Link flags
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%% DRIVER_CFLAGS - default -I paths for erts and ei
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%% DRIVER_LDFLAGS - default -L and -lerl_interface -lei
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run_cleanup_hook(Config) ->
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case rebar_config:get(Config, port_cleanup_script, undefined) of
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undefined ->
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ok;
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Script ->
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?CONSOLE("Running ~s\n", [Script]),
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rebar_utils:sh_failfast(Script, [])
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end.
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compile_each([], Acc, Config, Env) ->
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lists:reverse(Acc);
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compile_each([Source | Rest], Acc, Config, Env) ->
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compile_each([], Config, Env, NewBins, ExistingBins) ->
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{lists:reverse(NewBins), lists:reverse(ExistingBins)};
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compile_each([Source | Rest], Config, Env, NewBins, ExistingBins) ->
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Ext = filename:extension(Source),
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Bin = filename:rootname(Source, Ext) ++ ".o",
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case needs_compile(Source, Bin) of
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true ->
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?CONSOLE("Compiling ~s\n", [Source]),
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Compiler = compiler(Ext),
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case compiler(Ext) of
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"$CC" ->
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sh(?FMT("$CC -c $CFLAGS $DRIVER_CFLAGS ~s ~s", [Source, Bin]), Env);
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rebar_utils:sh_failfast(?FMT("$CC -c $CFLAGS $DRIVER_CFLAGS ~s -o ~s", [Source, Bin]), Env);
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"$CXX" ->
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sh(?FMT("$CXX -c $CXXFLAGS $DRIVER_CFLAGS ~s ~s", [Source, Bin]), Env)
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rebar_utils:sh_failfast(?FMT("$CXX -c $CXXFLAGS $DRIVER_CFLAGS ~s -o ~s", [Source, Bin]), Env)
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end,
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compile_each(Rest, [Bin | Acc], Config, Env).
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compile_each(Rest, Config, Env, [Bin | NewBins], ExistingBins);
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false ->
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?INFO("Skipping ~s\n", [Source]),
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compile_each(Rest, Config, Env, NewBins, [Bin | ExistingBins])
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end.
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@ -112,6 +177,18 @@ needs_compile(Source, Bin) ->
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%% TODO: Generate depends using gcc -MM so we can also check for include changes
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filelib:last_modified(Bin) < filelib:last_modified(Source).
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needs_link(SoName, []) ->
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filelib:last_modified(SoName) == 0;
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needs_link(SoName, NewBins) ->
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MaxLastMod = lists:max([filelib:last_modified(B) || B <- NewBins]),
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case filelib:last_modified(SoName) of
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0 ->
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true;
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Other ->
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?DEBUG("Checking ~p < ~p", [MaxLastMod, Other]),
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MaxLastMod < Other
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end.
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merge_envs(OverrideEnvs, DefaultEnvs) ->
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orddict:merge(fun(Key, Override, Default) ->
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expand_env_variable(Override, Key, Default)
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@ -120,8 +197,9 @@ merge_envs(OverrideEnvs, DefaultEnvs) ->
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orddict:from_list(DefaultEnvs)).
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%%
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%% Choose a compiler variable, based on a provided extension
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%%
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compiler(".cc") -> "$CXX";
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compiler(".cp") -> "$CXX";
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compiler(".cxx") -> "$CXX";
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@ -131,49 +209,66 @@ compiler(".c++") -> "$CXX";
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compiler(".C") -> "$CXX";
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compiler(_) -> "$CC".
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expand_env_variable(InStr, VarName, VarValue) ->
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%%
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%% Given env. variable FOO we want to expand all references to
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%% it in InStr. References can have two forms: $FOO and ${FOO}
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%%
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expand_env_variable(InStr, VarName, VarValue) ->
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R1 = re:replace(InStr, "\\\$" ++ VarName, VarValue),
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re:replace(R1, "\\\${" ++ VarName ++ "}", VarValue).
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re:replace(R1, "\\\${" ++ VarName ++ "}", VarValue, [{return, list}]).
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%%
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%% Filter a list of env vars such that only those which match the provided
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%% architecture regex (or do not have a regex) are returned.
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%%
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filter_envs([], Acc) ->
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lists:reverse(Acc);
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filter_envs([{ArchRegex, Key, Value} | Rest], Acc) ->
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case rebar_utils:is_arch(ArchRegex) of
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true ->
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filter_envs(Rest, [{Key, Value} | Acc]);
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false ->
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filter_envs(Rest, Acc)
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end;
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filter_envs([{Key, Value} | Rest], Acc) ->
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filter_envs(Rest, [{Key, Value} | Acc]).
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erts_dir() ->
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lists:concat([code:root_dir(), "/erts-", erlang:system_info(version)]).
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driver_envs() ->
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[{"DRIVER_CFLAGS", lists:concat([" -I", code:lib_dir(erl_interface, include),
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default_env() ->
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[{"CC", "gcc"},
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{"CXX", "g++"},
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{"CFLAGS", "-g -Wall -fPIC"},
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{"CXXFLAGS", "-g -Wall -fPIC"},
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{"darwin", "LDFLAGS", "-bundle -flat_namespace -undefined suppress"},
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{"linux", "LDFLAGS", "-shared"},
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{"DRIVER_CFLAGS", lists:concat([" -I", code:lib_dir(erl_interface, include),
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" -I", filename:join(erts_dir(), include),
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" "])},
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{"DRIVER_LDFLAGS", lists:concat([" -L", code:lib_dir(erl_interface, lib),
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" -lerl_interface -lei"])}].
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default_envs(darwin) ->
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[{"CC", "gcc"},
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{"CXX", "g++"},
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{"CFLAGS", "-g -Wall -fPIC"},
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{"LDFLAGS", "-bundle -flat_namespace -undefined surpress"}];
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default_envs(linux) ->
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[{"CC", "gcc"},
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{"CXX", "g++"},
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{"CFLAGS", "-g -Wall -fPIC"},
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{"LDFLAGS", "-shared"}];
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default_envs(Os) ->
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?ERROR("Unsupported operating system ~s: can not generate default build environment.\n", [Os]),
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?FAIL.
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sh(Command, Env) ->
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?CONSOLE("Cmd: ~p\n~p\n", [Command, Env]),
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Port = open_port({spawn, Command}, [{env, Env}, exit_status, {line, 16384},
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use_stdio, stderr_to_stdout]),
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sh_loop(Port).
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source_to_bin(Source) ->
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Ext = filename:extension(Source),
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filename:rootname(Source, Ext) ++ ".o".
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so_name(AppFile) ->
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%% Get the app name, which we'll use to generate the linked port driver name
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case rebar_app_utils:load_app_file(AppFile) of
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{ok, AppName, _} ->
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ok;
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error ->
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AppName = undefined,
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?FAIL
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end,
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%% Construct the driver name
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?FMT("priv/~s_drv.so", [AppName]).
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sh_loop(Port) ->
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receive
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{Port, {data, {_, Line}}} ->
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?CONSOLE("> ~s\n", [Line]),
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sh_loop(Port);
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{Port, Other} ->
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?CONSOLE(">> ~p\n", [Other])
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end.
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