| commit | f6157e8553d964b956572f3e3f48ef5d6e4e6838 | |
| author | Douglas Katzman <dougk@google.com> | |
| Sun, 11 Sep 2016 15:45:28 +0000 (11 11:45 -0400) | ||
| committer | Douglas Katzman <dougk@google.com> | |
| Sun, 11 Sep 2016 15:52:44 +0000 (11 11:52 -0400) | ||
| tree | 4550aa0b458de8ac5cfd0f9f651361d78ecdc61e | treesnapshot (tar.gz zip) |
| parent | b7f16a36fa71da699f1d6b6ff2032be87fee3782 | commitdiff |
Change layout bitmap so that 0 = raw, 1 = tagged
For structures containing a mixture of raw and non-raw slots, integer-length
of the bitmap suffices to determine the upper bound of tagged slots, without
having to look at instance-length. The special case of -1 indicates zero raw
slots. These changes make uses of the bitmap from C more natural,
because you usually care abouts slots to examine, not slots to skip,
and 1 is the obvious bit value for this purpose.
Also fix a bug in print_struct that shifted an integer by a larger count
than the size of the type, which is undefined behavior.
For structures containing a mixture of raw and non-raw slots, integer-length
of the bitmap suffices to determine the upper bound of tagged slots, without
having to look at instance-length. The special case of -1 indicates zero raw
slots. These changes make uses of the bitmap from C more natural,
because you usually care abouts slots to examine, not slots to skip,
and 1 is the obvious bit value for this purpose.
Also fix a bug in print_struct that shifted an integer by a larger count
than the size of the type, which is undefined behavior.
15 files changed: