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-rw-r--r--lib/tools/src/cover.erl86
1 files changed, 50 insertions, 36 deletions
diff --git a/lib/tools/src/cover.erl b/lib/tools/src/cover.erl
index 2579711dc7..dfcfc3675f 100644
--- a/lib/tools/src/cover.erl
+++ b/lib/tools/src/cover.erl
@@ -1951,47 +1951,61 @@ move_clauses([{M,F,A,C,_L}|Clauses]) ->
move_clauses(Clauses);
move_clauses([]) ->
ok.
-
%% Given a .beam file, find the .erl file. Look first in same directory as
-%% the .beam file, then in <beamdir>/../src
+%% the .beam file, then in ../src, then in compile info.
find_source(Module, File0) ->
- case filename:rootname(File0,".beam") of
- File0 ->
- File0;
- File ->
- InSameDir = File++".erl",
- case filelib:is_file(InSameDir) of
- true ->
- InSameDir;
- false ->
- Dir = filename:dirname(File),
- Mod = filename:basename(File),
- InDotDotSrc = filename:join([Dir,"..","src",Mod++".erl"]),
- case filelib:is_file(InDotDotSrc) of
- true ->
- InDotDotSrc;
- false ->
- find_source_from_module(Module, File0)
- end
- end
+ 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.
-%% In case we can't find the file from the given .beam,
-%% we try to get the information directly from the module source
-find_source_from_module(Module, File) ->
- Compile = Module:module_info(compile),
- case lists:keyfind(source, 1, Compile) of
- {source, Path} ->
- case filelib:is_file(Path) of
- true ->
- Path;
- false ->
- {beam, File}
- end;
- false ->
- {beam, File}
- 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)).
do_parallel_analysis(Module, Analysis, Level, Loaded, From, State) ->
analyse_info(Module,State#main_state.imported),