diff options
author | Andy Wingo <wingo@pobox.com> | 2011-02-13 22:02:01 +0100 |
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committer | Andy Wingo <wingo@pobox.com> | 2011-02-13 22:02:01 +0100 |
commit | e8ab529d57e2c3820e567737bd53c6e05e484c4d (patch) | |
tree | 1abbe3d22607e19d78c10f718513b2d6d43ff392 /libguile/objcodes.c | |
parent | 333a81ccbadc7a81abec1aff4b5981b9fad3786b (diff) | |
download | guile-e8ab529d57e2c3820e567737bd53c6e05e484c4d.tar.gz |
bump objcode version to 2.0; introduce minor-version compatibility
* libguile/_scm.h (SCM_OBJCODE_MAJOR_VERSION): Bump to 2.
(SCM_OBJCODE_MINOR_VERSION): Reset to 0.
(SCM_OBJCODE_MACHINE_VERSION_STRING, SCM_OBJCODE_COOKIE): Reorder so
the minor version is the last byte.
* libguile/objcodes.c (make_objcode_by_mmap): Accept objcodes whose
minor version is less than SCM_OBJCODE_MINOR_VERSION, not just equal
to.
Diffstat (limited to 'libguile/objcodes.c')
-rw-r--r-- | libguile/objcodes.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/libguile/objcodes.c b/libguile/objcodes.c index b7aa578ed..f4e20f8f2 100644 --- a/libguile/objcodes.c +++ b/libguile/objcodes.c @@ -77,7 +77,13 @@ make_objcode_by_mmap (int fd) SCM_SYSERROR; } - if (memcmp (addr, SCM_OBJCODE_COOKIE, strlen (SCM_OBJCODE_COOKIE))) + /* The cookie ends with a version of the form M.N, where M is the + major version and N is the minor version. For this Guile to be + able to load an objcode, M must be SCM_OBJCODE_MAJOR_VERSION, and N + must be less than or equal to SCM_OBJCODE_MINOR_VERSION. Since N + is the last character, we do a strict comparison on all but the + last, then a <= on the last one. */ + if (memcmp (addr, SCM_OBJCODE_COOKIE, strlen (SCM_OBJCODE_COOKIE) - 1)) { SCM args = scm_list_1 (scm_from_latin1_stringn (addr, strlen (SCM_OBJCODE_COOKIE))); @@ -86,6 +92,16 @@ make_objcode_by_mmap (int fd) scm_misc_error (FUNC_NAME, "bad header on object file: ~s", args); } + { + char minor_version = addr[strlen (SCM_OBJCODE_COOKIE) - 1]; + + if (minor_version > SCM_OBJCODE_MINOR_VERSION_STRING[0]) + scm_misc_error (FUNC_NAME, "objcode minor version too new (~a > ~a)", + scm_list_2 (scm_from_latin1_stringn (&minor_version, 1), + scm_from_latin1_string + (SCM_OBJCODE_MINOR_VERSION_STRING))); + } + data = (struct scm_objcode*)(addr + strlen (SCM_OBJCODE_COOKIE)); if (data->len + data->metalen != (st.st_size - sizeof (*data) - strlen (SCM_OBJCODE_COOKIE))) |