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lnat was originally "long unsigned int" but we were using it when we
wanted a 64-bit type on a 64-bit machine. This broke on Windows x64,
where long == int == 32 bits. Using types of unspecified size is bad,
but what we really wanted was a type with N bits on an N-bit machine.
StgWord is exactly that.
lnat was mentioned in some APIs that clients might be using
(e.g. StackOverflowHook()), so we leave it defined but with a comment
to say that it's deprecated.
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Mostly this meant getting pointer<->int conversions to use the right
sizes. lnat is now size_t, rather than unsigned long, as that seems a
better match for how it's used.
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The first phase of this tidyup is focussed on the header files, and in
particular making sure we are exposinng publicly exactly what we need
to, and no more.
- Rts.h now includes everything that the RTS exposes publicly,
rather than a random subset of it.
- Most of the public header files have moved into subdirectories, and
many of them have been renamed. But clients should not need to
include any of the other headers directly, just #include the main
public headers: Rts.h, HsFFI.h, RtsAPI.h.
- All the headers needed for via-C compilation have moved into the
stg subdirectory, which is self-contained. Most of the headers for
the rest of the RTS APIs have moved into the rts subdirectory.
- I left MachDeps.h where it is, because it is so widely used in
Haskell code.
- I left a deprecated stub for RtsFlags.h in place. The flag
structures are now exposed by Rts.h.
- Various internal APIs are no longer exposed by public header files.
- Various bits of dead code and declarations have been removed
- More gcc warnings are turned on, and the RTS code is more
warning-clean.
- More source files #include "PosixSource.h", and hence only use
standard POSIX (1003.1c-1995) interfaces.
There is a lot more tidying up still to do, this is just the first
pass. I also intend to standardise the names for external RTS APIs
(e.g use the rts_ prefix consistently), and declare the internal APIs
as hidden for shared libraries.
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This is the result of Bernie Pope's internship work at MSR Cambridge,
with some subsequent improvements by me. The main plan was to
(a) Reduce the overhead for breakpoints, so we could enable
the feature by default without incurrent a significant penalty
(b) Scatter more breakpoint sites throughout the code
Currently we can set a breakpoint on almost any subexpression, and the
overhead is around 1.5x slower than normal GHCi. I hope to be able to
get this down further and/or allow breakpoints to be turned off.
This patch also fixes up :print following the recent changes to
constructor info tables. (most of the :print tests now pass)
We now support single-stepping, which just enables all breakpoints.
:step <expr> executes <expr> with single-stepping turned on
:step single-steps from the current breakpoint
The mechanism is quite different to the previous implementation. We
share code with the HPC (haskell program coverage) implementation now.
The coverage pass annotates source code with "tick" locations which
are tracked by the coverage tool. In GHCi, each "tick" becomes a
potential breakpoint location.
Previously breakpoints were compiled into code that magically invoked
a nested instance of GHCi. Now, a breakpoint causes the current
thread to block and control is returned to GHCi.
See the wiki page for more details and the current ToDo list:
http://hackage.haskell.org/trac/ghc/wiki/NewGhciDebugger
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This is a simplification & minor optimisation for GHCi
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In preparation for parallel GC, split up the monolithic GC.c file into
smaller parts. Also in this patch (and difficult to separate,
unfortunatley):
- Don't include Stable.h in Rts.h, instead just include it where
necessary.
- consistently use STATIC_INLINE in source files, and INLINE_HEADER
in header files. STATIC_INLINE is now turned off when DEBUG is on,
to make debugging easier.
- The GC no longer takes the get_roots function as an argument.
We weren't making use of this generalisation.
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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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