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This one complains sometimes, but there's no good way to improve it.
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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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It still lives in darcs, if anyone wants to revive it sometime.
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It adds a third case to StgOp which already hold StgPrimOp and StgFCallOp.
The code generation for the new StgPrimCallOp case is almost exactly the
same as for out-of-line primops. They now share the tailCallPrim function.
In the Core -> STG translation we map foreign calls using the "prim"
calling convention to the StgPrimCallOp case. This is because in Core we
represent prim calls using the ForeignCall stuff. At the STG level however
the prim calls are really much more like primops than foreign calls.
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One of these things is not like the others:
stdPattern :: [LRep] -> Maybe StgHalfWord
stdPattern reps
= case reps of
[] -> Just ARG_NONE -- just void args, probably
[N] -> Just ARG_N
[P] -> Just ARG_N
[F] -> Just ARG_F
[D] -> Just ARG_D
[L] -> Just ARG_L
Today's debugging session was brought to you by the letter P.
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- Previously, the node was taken as a parameter, then ignored,
for static closures. Goofy. Now, the vestigial node parameters
are gone.
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node argument is managed
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making calls
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- yet another wrong calling convention; this one was a special case for returning one
value.
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- The function argument was stripped from the argument list but not from the type.
Now they're both stripped.
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Since we introduced pointer tagging, we no longer always enter a
closure to evaluate it. However, the biographical profiler relies on
closures being entered in order to mark them as "used", so we were
getting spurious amounts of data attributed to VOID. It turns out
there are various places that need to be fixed, and I think at least
one of them was also wrong before pointer tagging (CgCon.cgReturnDataCon).
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Among others:
- Fixed Stg->C-- translation of let-no-escapes -- it's important to use the
right continuation...
- Fixed infinite recursion in X86 backend (shortcutJump mishandled infinite loops)
- Fixed yet another wrong calling convention -- primops take args only in vanilla regs,
but they may return results on the stack!
- Removed StackInfo from LGraph and Block -- now in LastCall and CmmZ
- Updated avail-variable and liveness code
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We used to generated things like:
extern StgWordArray (newCAF) __attribute__((aligned (8)));
((void (*)(void *))(W_)&newCAF)((void *)R1.w);
(which is to say, pretend that newCAF is some data, then cast it to a
function and call it).
This goes wrong on at least IA64, where:
A function pointer on the ia64 does not point to the first byte of
code. Intsead, it points to a structure that describes the function.
The first quadword in the structure is the address of the first byte
of code
so we end up dereferencing function pointers one time too many, and
segfaulting.
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We used to use StaticFlags
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