simplify the backtrace of include

Using the ability to delete functions, we can make this code a bit nicer and simpler.
(similar to #33087)

base/Base.jl

@@ -4,6 +4,19 @@ baremodule Base
 
 using Core.Intrinsics, Core.IR
 
+# to start, we're going to use a very simple definition of `include`
+# that doesn't require any function (except what we can get from the `Core` top-module)
+const _included_files = Array{Tuple{Module,String},1}()
+function include(mod::Module, path::String)
+    ccall(:jl_array_grow_end, Cvoid, (Any, UInt), _included_files, UInt(1))
+    Core.arrayset(true, _included_files, (mod, ccall(:jl_prepend_cwd, Any, (Any,), path)), arraylen(_included_files))
+    Core.println(path)
+    ccall(:jl_uv_flush, Nothing, (Ptr{Nothing},), Core.io_pointer(Core.stdout))
+    Core.include(mod, path)
+end
+include(path::String) = include(Base, path)
+
+# from now on, this is now a top-module for resolving syntax
 const is_primary_base_module = ccall(:jl_module_parent, Ref{Module}, (Any,), Base) === Core.Main
 ccall(:jl_set_istopmod, Cvoid, (Any, Bool), Base, is_primary_base_module)
 
@@ -20,50 +33,6 @@ setproperty!(x::Tuple, f::Int, v) = setfield!(x, f, v) # to get a decent error
 getproperty(Core.@nospecialize(x), f::Symbol) = getfield(x, f)
 setproperty!(x, f::Symbol, v) = setfield!(x, f, convert(fieldtype(typeof(x), f), v))
 
-function include_relative end
-function include(mod::Module, path::AbstractString)
-    local result
-    if INCLUDE_STATE === 1
-        result = _include1(mod, path)
-    elseif INCLUDE_STATE === 2
-        result = _include(mod, path)
-    elseif INCLUDE_STATE === 3
-        result = include_relative(mod, path)
-    end
-    result
-end
-function include(path::AbstractString)
-    local result
-    if INCLUDE_STATE === 1
-        result = _include1(Base, path)
-    elseif INCLUDE_STATE === 2
-        result = _include(Base, path)
-    else
-        # to help users avoid error (accidentally evaluating into Base), this is not allowed
-        error("Base.include(string) is discontinued, use `include(fname)` or `Base.include(@__MODULE__, fname)` instead.")
-    end
-    result
-end
-const _included_files = Array{Tuple{Module,String},1}()
-function _include1(mod::Module, path)
-    Core.Compiler.push!(_included_files, (mod, ccall(:jl_prepend_cwd, Any, (Any,), path)))
-    Core.include(mod, path)
-end
-let SOURCE_PATH = ""
-    # simple, race-y TLS, relative include
-    global _include
-    function _include(mod::Module, path)
-        prev = SOURCE_PATH
-        path = normpath(joinpath(dirname(prev), path))
-        push!(_included_files, (mod, abspath(path)))
-        SOURCE_PATH = path
-        result = Core.include(mod, path)
-        SOURCE_PATH = prev
-        result
-    end
-end
-INCLUDE_STATE = 1 # include = Core.include
-
 include("coreio.jl")
 
 eval(x) = Core.eval(Base, x)
@@ -279,7 +248,21 @@ using .Math
 const (√)=sqrt
 const (∛)=cbrt
 
-INCLUDE_STATE = 2 # include = _include (from lines above)
+# now switch to a simple, race-y TLS, relative include for the rest of Base
+delete_method(which(include, (Module, String)))
+let SOURCE_PATH = ""
+    global function include(mod::Module, path::String)
+        prev = SOURCE_PATH
+        path = normpath(joinpath(dirname(prev), path))
+        Core.println(path)
+        ccall(:jl_uv_flush, Nothing, (Ptr{Nothing},), Core.io_pointer(Core.stdout))
+        push!(_included_files, (mod, abspath(path)))
+        SOURCE_PATH = path
+        result = Core.include(mod, path)
+        SOURCE_PATH = prev
+        return result
+    end
+end
 
 # reduction along dims
 include("reducedim.jl")  # macros in this file relies on string.jl
@@ -377,6 +360,34 @@ if isdefined(Core, :Compiler) && is_primary_base_module
     Docs.loaddocs(Core.Compiler.CoreDocs.DOCS)
 end
 
+# finally, now make `include` point to the full version
+for m in methods(include)
+    delete_method(m)
+end
+# These functions are duplicated in client.jl/include(::String) for
+# nicer stacktraces. Modifications here have to be backported there
+include(mod::Module, path::AbstractString) = include(mod, convert(String, path))
+function include(mod::Module, _path::String)
+    path, prev = _include_dependency(mod, _path)
+    for callback in include_callbacks # to preserve order, must come before Core.include
+        invokelatest(callback, mod, path)
+    end
+    tls = task_local_storage()
+    tls[:SOURCE_PATH] = path
+    local result
+    try
+        # result = Core.include(mod, path)
+        result = ccall(:jl_load_, Any, (Any, Any), mod, path)
+    finally
+        if prev === nothing
+            delete!(tls, :SOURCE_PATH)
+        else
+            tls[:SOURCE_PATH] = prev
+        end
+    end
+    return result
+end
+
 end_base_include = time_ns()
 
 if is_primary_base_module
@@ -405,7 +416,7 @@ function __init__()
     nothing
 end
 
-INCLUDE_STATE = 3 # include = include_relative
+
 end
 
 const tot_time_stdlib = RefValue(0.0)

base/client.jl

@@ -429,23 +429,24 @@ end
 
 # MainInclude exists to hide Main.include and eval from `names(Main)`.
 baremodule MainInclude
+using ..Base
 # We inline the definition of include from loading.jl/include_relative to get one-frame stacktraces.
 # include(fname::AbstractString) = Main.Base.include(Main, fname)
 function include(fname::AbstractString)
     mod = Main
-    isa(fname, String) || (fname = String(fname))
-    path, prev = Main.Base._include_dependency(mod, fname)
-    for callback in Main.Base.include_callbacks # to preserve order, must come before Core.include
-        Main.Base.invokelatest(callback, mod, path)
+    isa(fname, String) || (fname = Base.convert(String, fname))
+    path, prev = Base._include_dependency(mod, fname)
+    for callback in Base.include_callbacks # to preserve order, must come before Core.include
+        Base.invokelatest(callback, mod, path)
     end
-    tls = Main.Base.task_local_storage()
+    tls = Base.task_local_storage()
     tls[:SOURCE_PATH] = path
     local result
     try
         result = ccall(:jl_load_, Any, (Any, Any), mod, path)
     finally
         if prev === nothing
-            Main.Base.delete!(tls, :SOURCE_PATH)
+            Base.delete!(tls, :SOURCE_PATH)
         else
             tls[:SOURCE_PATH] = prev
         end

base/loading.jl

@@ -1050,7 +1050,7 @@ function _require(pkg::PkgId)
             ccall(:jl_set_module_uuid, Cvoid, (Any, NTuple{2, UInt64}), __toplevel__, uuid)
         end
         try
-            include_relative(__toplevel__, path)
+            include(__toplevel__, path)
             return
         finally
             if uuid !== old_uuid
@@ -1092,29 +1092,6 @@ function source_dir()
     return p === nothing ? pwd() : dirname(p)
 end
 
-# These functions are duplicated in client.jl/include(::String) for
-# nicer stacktraces. Modifications here have to be backported there
-include_relative(mod::Module, path::AbstractString) = include_relative(mod, String(path))
-function include_relative(mod::Module, _path::String)
-    path, prev = _include_dependency(mod, _path)
-    for callback in include_callbacks # to preserve order, must come before Core.include
-        invokelatest(callback, mod, path)
-    end
-    tls = task_local_storage()
-    tls[:SOURCE_PATH] = path
-    local result
-    try
-        result = Core.include(mod, path)
-    finally
-        if prev === nothing
-            delete!(tls, :SOURCE_PATH)
-        else
-            tls[:SOURCE_PATH] = prev
-        end
-    end
-    return result
-end
-
 """
     Base.include([m::Module,] path::AbstractString)
 

src/jl_uv.c

@@ -157,7 +157,7 @@ static void uv_flush_callback(uv_write_t *req, int status)
 // Turn a normal write into a blocking write (primarily for use from C and gdb).
 // Warning: This calls uv_run, so it can have unbounded side-effects.
 // Be care where you call it from! - the libuv loop is also not reentrant.
-void jl_uv_flush(uv_stream_t *stream)
+JL_DLLEXPORT void jl_uv_flush(uv_stream_t *stream)
 {
     if (stream == (void*)STDIN_FILENO ||
         stream == (void*)STDOUT_FILENO ||

src/rtutils.c

@@ -496,16 +496,18 @@ JL_DLLEXPORT void jl_flush_cstdio(void) JL_NOTSAFEPOINT
 
 JL_DLLEXPORT jl_value_t *jl_stdout_obj(void) JL_NOTSAFEPOINT
 {
-    if (jl_base_module == NULL) return NULL;
-    jl_value_t *stdout_obj = jl_get_module_binding(jl_base_module, jl_symbol("stdout"))->value;
-    return stdout_obj;
+    if (jl_base_module == NULL)
+        return NULL;
+    jl_binding_t *stdout_obj = jl_get_module_binding(jl_base_module, jl_symbol("stdout"));
+    return stdout_obj ? stdout_obj->value : NULL;
 }
 
 JL_DLLEXPORT jl_value_t *jl_stderr_obj(void) JL_NOTSAFEPOINT
 {
-    if (jl_base_module == NULL) return NULL;
-    jl_value_t *stderr_obj = jl_get_module_binding(jl_base_module, jl_symbol("stderr"))->value;
-    return stderr_obj;
+    if (jl_base_module == NULL)
+        return NULL;
+    jl_binding_t *stderr_obj = jl_get_module_binding(jl_base_module, jl_symbol("stderr"));
+    return stderr_obj ? stderr_obj->value : NULL;
 }
 
 // toys for debugging ---------------------------------------------------------

src/toplevel.c

@@ -865,12 +865,6 @@ JL_DLLEXPORT jl_value_t *jl_infer_thunk(jl_code_info_t *thk, jl_module_t *m)
 
 JL_DLLEXPORT jl_value_t *jl_load(jl_module_t *module, const char *fname)
 {
-    if (module->istopmod) {
-        jl_printf(JL_STDOUT, "%s\r\n", fname);
-#ifdef _OS_WINDOWS_
-        jl_uv_flush(JL_STDOUT);
-#endif
-    }
     uv_stat_t stbuf;
     if (jl_stat(fname, (char*)&stbuf) != 0 || (stbuf.st_mode & S_IFMT) != S_IFREG) {
         jl_errorf("could not open file %s", fname);

test/precompile.jl

@@ -144,11 +144,11 @@ try
                               missing, missing, missing,
                               missing, missing, 6]
 
-              let some_method = which(Base.include, (String,))
+              let some_method = which(Base.include, (Module, String,))
                     # global const some_method // FIXME: support for serializing a direct reference to an external Method not implemented
                   global const some_linfo =
                       ccall(:jl_specializations_get_linfo, Ref{Core.MethodInstance}, (Any, Any, Any, UInt),
-                          some_method, Tuple{typeof(Base.include), String}, Core.svec(), typemax(UInt))
+                          some_method, Tuple{typeof(Base.include), Module, String}, Core.svec(), typemax(UInt))
               end
 
               g() = override(1.0)
@@ -287,10 +287,10 @@ try
                 Val{3},
                 Val{nothing}},
             0:25)
-        some_method = which(Base.include, (String,))
+        some_method = which(Base.include, (Module, String,))
         some_linfo =
                 ccall(:jl_specializations_get_linfo, Ref{Core.MethodInstance}, (Any, Any, Any, UInt),
-                    some_method, Tuple{typeof(Base.include), String}, Core.svec(), typemax(UInt))
+                    some_method, Tuple{typeof(Base.include), Module, String}, Core.svec(), typemax(UInt))
         @test Foo.some_linfo::Core.MethodInstance === some_linfo
 
         ft = Base.datatype_fieldtypes