Improve require/File.expand_path performance on Windows

* configure.in (mingw): add shlwapi to the list of dependency
  libs for Windows.
* win32/Makefile.sub (EXTSOLIBS): ditto.

* internal.h: declare internal functions rb_w32_init_file,
  rb_file_expand_path_internal and rb_file_expand_path_fast.

* file.c (Init_File): invoke Windows initialization rb_w32_init_file

* win32/file.c (rb_file_load_path_internal): new function.
  Windows-specific implementation that replaces file_expand_path.
  [Bug #6836][ruby-core:46996]

* win32/file.c (rb_w32_init_file): new function. Initialize codepage
  cache for faster conversion encodings lookup.

* file.c (file_expand_path): rename to rb_file_expand_path_internal.
  Conditionally exclude from Windows.

* file.c (rb_file_expand_path_fast): new function. delegates to
  rb_file_expand_path_internal without performing a hit to the
  filesystem.

* file.c (file_expand_path_1): use rb_file_expand_path_internal without
  path expansion (used by require).
* file.c (rb_find_file_ext_safe): ditto.
* file.c (rb_find_file_safe): ditto.

* load.c (rb_get_expanded_load_path): use rb_file_expand_path_fast.
* load.c (rb_feature_provided): ditto.

* file.c (rb_file_expand_path): use rb_file_expand_path_internal with
  path expansion.
* file.c (rb_file_absolute_path): ditto.

* test/ruby/test_file_exhaustive.rb: new tests to exercise
  rb_file_expand_path_internal implementation and compliance with
  existing behaviors.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36811 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/internal.h b/internal.h
index c091a1c49e..ed4864c1eb 100644
--- a/internal.h
+++ b/internal.h
@@ -105,8 +105,15 @@ VALUE rb_home_dir(const char *user, VALUE result);
 VALUE rb_realpath_internal(VALUE basedir, VALUE path, int strict);
 void rb_file_const(const char*, VALUE);
 int rb_file_load_ok(const char *);
+VALUE rb_file_expand_path_fast(VALUE, VALUE);
+VALUE rb_file_expand_path_internal(VALUE, VALUE, int, int, VALUE);
 void Init_File(void);
 
+#ifdef _WIN32
+/* file.c, win32/file.c */
+void rb_w32_init_file(void);
+#endif
+
 /* gc.c */
 void Init_heap(void);
 void *ruby_mimmalloc(size_t size);