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Now that constructor info tables contain the name of the constructor,
we can generate useful heap profiles without requiring the whole
program and libraries to be compiled with -prof. So now, "+RTS -hT"
generates a heap profile for any program, dividing the profile by
constructor. It wouldn't be hard to add support for grouping
constructors by module, or to restrict the profile to certain
constructors/modules/packages.
This means that for the first time we can get heap profiles for GHCi,
which was previously impossible because the byte-code
interpreter and linker don't work with -prof.
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conc021 is an example of a program that broke.
It doesn't handle them particularly well still, but it doesn't crash at
least.
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We now check for freeing memory that isn't allocated, and overwrite memory
we are about to free with 0xaa.
It might be nice to also have a flag to control whether the memory
actually gets free'd.
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See bug #738
Allocating executable memory is getting more difficult these days. In
particular, the default SELinux policy on Fedora Core 5 disallows
making the heap (i.e. malloc()'d memory) executable, although it does
apparently allow mmap()'ing anonymous executable memory by default.
Previously, stgMallocBytesRWX() used malloc() underneath, and then
tried to make the page holding the memory executable. This was rather
hacky and fails with Fedora Core 5.
This patch adds a mini-allocator for executable memory, based on the
block allocator. We grab page-sized blocks and make them executable,
then allocate small objects from the page. There's a simple free
function, that will free whole pages back to the system when they are
empty.
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This is simpler than using _POSIX_THREAD_SEMANTICS on Solaris to get
the right version of ctime_r().
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Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.
The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level. The build system now makes no
pretense at being multi-project, it is just the GHC build system.
No doubt this will break many things, and there will be a period of
instability while we fix the dependencies. A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.
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