Store the evaluating module in precompile cache

This ensures that it's possible to re-evaluate modified code on a file-by-file basis (as with Revise)

base/loading.jl

@@ -208,17 +208,17 @@ const include_callbacks = Any[]
 
 # used to optionally track dependencies when requiring a module:
 const _concrete_dependencies = Any[] # these dependency versions are "set in stone", and the process should try to avoid invalidating them
-const _require_dependencies = Any[] # a list of (path, mtime) tuples that are the file dependencies of the module currently being precompiled
+const _require_dependencies = Any[] # a list of (mod, path, mtime) tuples that are the file dependencies of the module currently being precompiled
 const _track_dependencies = Ref(false) # set this to true to track the list of file dependencies
-function _include_dependency(_path::AbstractString)
+function _include_dependency(modstring::AbstractString, _path::AbstractString)
     prev = source_path(nothing)
     if prev === nothing
         path = abspath(_path)
     else
         path = joinpath(dirname(prev), _path)
     end
     if _track_dependencies[]
-        push!(_require_dependencies, (path, mtime(path)))
+        push!(_require_dependencies, (modstring, path, mtime(path)))
     end
     return path, prev
 end
@@ -234,7 +234,7 @@ This is only needed if your module depends on a file that is not used via `inclu
 no effect outside of compilation.
 """
 function include_dependency(path::AbstractString)
-    _include_dependency(path)
+    _include_dependency("#__external__", path)
     return nothing
 end
 
@@ -522,7 +522,7 @@ end
 
 include_relative(mod::Module, path::AbstractString) = include_relative(mod, String(path))
 function include_relative(mod::Module, _path::String)
-    path, prev = _include_dependency(_path)
+    path, prev = _include_dependency(string(mod), _path)
     for callback in include_callbacks # to preserve order, must come before Core.include
         invokelatest(callback, mod, path)
     end
@@ -678,13 +678,17 @@ function parse_cache_header(f::IO)
     end
     totbytes = ntoh(read(f, Int64)) # total bytes for file dependencies
     # read the list of files
-    files = Tuple{String,Float64}[]
+    files = Tuple{String,String,Float64}[]
     while true
-        n = ntoh(read(f, Int32))
-        n == 0 && break
-        totbytes -= 4 + n + 8
-        @assert n >= 0 "EOF while reading cache header" # probably means this wasn't a valid file to be read by Base.parse_cache_header
-        push!(files, (String(read(f, n)), ntoh(read(f, Float64))))
+        n1 = ntoh(read(f, Int32))
+        n1 == 0 && break
+        @assert n1 >= 0 "EOF while reading cache header" # probably means this wasn't a valid file to be read by Base.parse_cache_header
+        modname = String(read(f, n1))
+        n2 = ntoh(read(f, Int32))
+        @assert n2 >= 0 "EOF while reading cache header" # probably means this wasn't a valid file to be read by Base.parse_cache_header
+        filename = String(read(f, n2))
+        push!(files, (modname, filename, ntoh(read(f, Float64))))
+        totbytes -= 8 + n1 + n2 + 8
     end
     @assert totbytes == 4 "header of cache file appears to be corrupt"
     # read the list of modules that are required to be present during loading
@@ -711,7 +715,7 @@ end
 
 function cache_dependencies(f::IO)
     defs, files, modules = parse_cache_header(f)
-    return modules, files
+    return modules, map(mod_fl_mt -> (mod_fl_mt[2], mod_fl_mt[3]), files)  # discard the module
 end
 
 function cache_dependencies(cachefile::String)
@@ -763,11 +767,11 @@ function stale_cachefile(modpath::String, cachefile::String)
         end
 
         # now check if this file is fresh relative to its source files
-        if !samefile(files[1][1], modpath)
-            DEBUG_LOADING[] && info("JL_DEBUG_LOADING: Rejecting cache file $cachefile because it is for file $(files[1][1])) not file $modpath.")
+        if !samefile(files[1][2], modpath)
+            DEBUG_LOADING[] && info("JL_DEBUG_LOADING: Rejecting cache file $cachefile because it is for file $(files[1][2])) not file $modpath.")
             return true # cache file was compiled from a different path
         end
-        for (f, ftime_req) in files
+        for (_, f, ftime_req) in files
             # Issue #13606: compensate for Docker images rounding mtimes
             # Issue #20837: compensate for GlusterFS truncating mtimes to microseconds
             ftime = mtime(f)

src/dump.c

@@ -1030,7 +1030,7 @@ static void write_mod_list(ios_t *s, jl_array_t *a)
 }
 
 // "magic" string and version header of .ji file
-static const int JI_FORMAT_VERSION = 3;
+static const int JI_FORMAT_VERSION = 4;
 static const char JI_MAGIC[] = "\373jli\r\n\032\n"; // based on PNG signature
 static const uint16_t BOM = 0xFEFF; // byte-order marker
 static void write_header(ios_t *s)
@@ -1089,7 +1089,9 @@ static void write_dependency_list(ios_t *s)
         for (size_t i=0; i < l; i++) {
             jl_value_t *dep = jl_fieldref(jl_array_ptr_ref(udeps, i), 0);
             size_t slen = jl_string_len(dep);
-            total_size += 4 + slen + 8;
+            dep = jl_fieldref(jl_array_ptr_ref(udeps, i), 1);
+            slen += jl_string_len(dep);
+            total_size += 8 + slen + 8;
         }
         total_size += 4;
     }
@@ -1100,11 +1102,15 @@ static void write_dependency_list(ios_t *s)
         size_t l = jl_array_len(udeps);
         for (size_t i=0; i < l; i++) {
             jl_value_t *deptuple = jl_array_ptr_ref(udeps, i);
-            jl_value_t *dep = jl_fieldref(deptuple, 0);
+            jl_value_t *dep = jl_fieldref(deptuple, 0);  // evaluating module (as string)
             size_t slen = jl_string_len(dep);
             write_int32(s, slen);
             ios_write(s, jl_string_data(dep), slen);
-            write_float64(s, jl_unbox_float64(jl_fieldref(deptuple, 1)));
+            dep = jl_fieldref(deptuple, 1);              // file abspath
+            slen = jl_string_len(dep);
+            write_int32(s, slen);
+            ios_write(s, jl_string_data(dep), slen);
+            write_float64(s, jl_unbox_float64(jl_fieldref(deptuple, 2)));  // mtime
         }
         write_int32(s, 0); // terminator, for ease of reading
     }

test/compile.jl

@@ -204,16 +204,17 @@ try
         @test stringmime("text/plain", Base.Docs.doc(Foo.Bar.bar)) == "bar function\n"
 
         modules, deps, required_modules = Base.parse_cache_header(cachefile)
+        discard_module = mod_fl_mt -> (mod_fl_mt[2], mod_fl_mt[3])
         @test modules == Dict(Foo_module => Base.module_uuid(Foo))
-        @test map(x -> x[1],  sort(deps)) == [Foo_file, joinpath(dir, "bar.jl"), joinpath(dir, "foo.jl")]
+        @test map(x -> x[1],  sort(discard_module.(deps))) == [Foo_file, joinpath(dir, "bar.jl"), joinpath(dir, "foo.jl")]
 
         modules, deps1 = Base.cache_dependencies(cachefile)
         @test modules == merge(Dict(s => Base.module_uuid(getfield(Foo, s)) for s in
                                     [:Base, :Core, Foo2_module, FooBase_module, :Main, :Test]),
                                # plus modules included in the system image
                                Dict(s => Base.module_uuid(Base.root_module(s)) for s in
                                     [:DelimitedFiles,:Mmap]))
-        @test deps == deps1
+        @test discard_module.(deps) == deps1
 
         @test current_task()(0x01, 0x4000, 0x30031234) == 2
         @test nothing(0x01, 0x4000, 0x30031234) == 52