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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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We now have more stg_ap entry points: stg_ap_*_fast, which take
arguments in registers according to the platform calling convention.
This is faster if the function being called is evaluated and has the
right arity, which is the common case (see the eval/apply paper for
measurements).
We still need the stg_ap_*_info entry points for stack-based
application, such as an overflows when a function is applied to too
many argumnets. The stg_ap_*_fast functions actually just check for
an evaluated function, and if they don't find one, push the args on
the stack and invoke stg_ap_*_info. (this might be slightly slower in
some cases, but not the common case).
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Small code-size optimisation: I forgot to add a specialised case for
functions with no argument words (which might happen if the function
takes a void argument, for example).
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Flags cleanup.
Basically the purpose of this commit is to move more of the compiler's
global state into DynFlags, which is moving in the direction we need
to go for the GHC API which can have multiple active sessions
supported by a single GHC instance.
Before:
$ grep 'global_var' */*hs | wc -l
78
After:
$ grep 'global_var' */*hs | wc -l
27
Well, it's an improvement. Most of what's left won't really affect
our ability to host multiple sessions.
Lots of static flags have become dynamic flags (yay!). Notably lots
of flags that we used to think of as "driver" flags, like -I and -L,
are now dynamic. The most notable static flags left behind are the
"way" flags, eg. -prof. It would be nice to fix this, but it isn't
urgent.
On the way, lots of cleanup has happened. Everything related to
static and dynamic flags lives in StaticFlags and DynFlags
respectively, and they share a common command-line parser library in
CmdLineParser. The flags related to modes (--makde, --interactive
etc.) are now private to the front end: in fact private to Main
itself, for now.
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-------------------------------
Use merge-sort not quicksort
Nuke quicksort altogether
-------------------------------
Quicksort has O(n**2) behaviour worst case, and this occasionally bites.
In particular, when compiling large files consisting only of static data,
we get loads of top-level delarations -- and that led to more than half the
total compile time being spent in the strongly connected component analysis
for the occurrence analyser. Switching to merge sort completely solved the
problem.
I've nuked quicksort altogether to make sure this does not happen again.
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Merge backend-hacking-branch onto HEAD. Yay!
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