| Commit message (Collapse) | Author | Age | Files | Lines |
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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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Add support for UTF-8 source files
GHC finally has support for full Unicode in source files. Source
files are now assumed to be UTF-8 encoded, and the full range of
Unicode characters can be used, with classifications recognised using
the implementation from Data.Char. This incedentally means that only
the stage2 compiler will recognise Unicode in source files, because I
was too lazy to port the unicode classifier code into libcompat.
Additionally, the following synonyms for keywords are now recognised:
forall symbol (U+2200) forall
right arrow (U+2192) ->
left arrow (U+2190) <-
horizontal ellipsis (U+22EF) ..
there are probably more things we could add here.
This will break some source files if Latin-1 characters are being used.
In most cases this should result in a UTF-8 decoding error. Later on
if we want to support more encodings (perhaps with a pragma to specify
the encoding), I plan to do it by recoding into UTF-8 before parsing.
Internally, there were some pretty big changes:
- FastStrings are now stored in UTF-8
- Z-encoding has been moved right to the back end. Previously we
used to Z-encode every identifier on the way in for simplicity,
and only decode when we needed to show something to the user.
Instead, we now keep every string in its UTF-8 encoding, and
Z-encode right before printing it out. To avoid Z-encoding the
same string multiple times, the Z-encoding is cached inside the
FastString the first time it is requested.
This speeds up the compiler - I've measured some definite
improvement in parsing at least, and I expect compilations overall
to be faster too. It also cleans up a lot of cruft from the
OccName interface. Z-encoding is nicely hidden inside the
Outputable instance for Names & OccNames now.
- StringBuffers are UTF-8 too, and are now represented as
ForeignPtrs.
- I've put together some test cases, not by any means exhaustive,
but there are some interesting UTF-8 decoding error cases that
aren't obvious. Also, take a look at unicode001.hs for a demo.
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Add a layer of write buffering over Handle when dumping the output:
this saves a lot of time because we're doing a lot of small writes,
and Handle operations have a non-trivial constant overhead due to the
thread-safety, exception-safety etc.
This improvement results in about a 10% reduction in compile time for
non-optimised, somewhat less for optimised compilation.
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Add accurate source location annotations to HsSyn
-------------------------------------------------
Every syntactic entity in HsSyn is now annotated with a SrcSpan, which
details the exact beginning and end points of that entity in the
original source file. All honest compilers should do this, and it was
about time GHC did the right thing.
The most obvious benefit is that we now have much more accurate error
messages; when running GHC inside emacs for example, the cursor will
jump to the exact location of an error, not just a line somewhere
nearby. We haven't put a huge amount of effort into making sure all
the error messages are accurate yet, so there could be some tweaking
still needed, although the majority of messages I've seen have been
spot-on.
Error messages now contain a column number in addition to the line
number, eg.
read001.hs:25:10: Variable not in scope: `+#'
To get the full text span info, use the new option -ferror-spans. eg.
read001.hs:25:10-11: Variable not in scope: `+#'
I'm not sure whether we should do this by default. Emacs won't
understand the new error format, for one thing.
In a more elaborate editor setting (eg. Visual Studio), we can arrange
to actually highlight the subexpression containing an error. Eventually
this information will be used so we can find elements in the abstract
syntax corresponding to text locations, for performing high-level editor
functions (eg. "tell me the type of this expression I just highlighted").
Performance of the compiler doesn't seem to be adversely affected.
Parsing is still quicker than in 6.0.1, for example.
Implementation:
This was an excrutiatingly painful change to make: both Simon P.J. and
myself have been working on it for the last three weeks or so. The
basic changes are:
- a new datatype SrcSpan, which represents a beginning and end position
in a source file.
- To reduce the pain as much as possible, we also defined:
data Located e = L SrcSpan e
- Every datatype in HsSyn has an equivalent Located version. eg.
type LHsExpr id = Located (HsExpr id)
and pretty much everywhere we used to use HsExpr we now use
LHsExpr. Believe me, we thought about this long and hard, and
all the other options were worse :-)
Additional changes/cleanups we made at the same time:
- The abstract syntax for bindings is now less arcane. MonoBinds
and HsBinds with their built-in list constructors have gone away,
replaced by HsBindGroup and HsBind (see HsSyn/HsBinds.lhs).
- The various HsSyn type synonyms have now gone away (eg. RdrNameHsExpr,
RenamedHsExpr, and TypecheckedHsExpr are now HsExpr RdrName,
HsExpr Name, and HsExpr Id respectively).
- Utilities over HsSyn are now collected in a new module HsUtils.
More stuff still needs to be moved in here.
- MachChar now has a real Char instead of an Int. All GHC versions that
can compile GHC now support 32-bit Chars, so this was a simplification.
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-------------------------
GHC heart/lung transplant
-------------------------
This major commit changes the way that GHC deals with importing
types and functions defined in other modules, during renaming and
typechecking. On the way I've changed or cleaned up numerous other
things, including many that I probably fail to mention here.
Major benefit: GHC should suck in many fewer interface files when
compiling (esp with -O). (You can see this with -ddump-rn-stats.)
It's also some 1500 lines of code shorter than before.
** So expect bugs! I can do a 3-stage bootstrap, and run
** the test suite, but you may be doing stuff I havn't tested.
** Don't update if you are relying on a working HEAD.
In particular, (a) External Core and (b) GHCi are very little tested.
But please, please DO test this version!
------------------------
Big things
------------------------
Interface files, version control, and importing declarations
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* There is a totally new data type for stuff that lives in interface files:
Original names IfaceType.IfaceExtName
Types IfaceType.IfaceType
Declarations (type,class,id) IfaceSyn.IfaceDecl
Unfoldings IfaceSyn.IfaceExpr
(Previously we used HsSyn for type/class decls, and UfExpr for unfoldings.)
The new data types are in iface/IfaceType and iface/IfaceSyn. They are
all instances of Binary, so they can be written into interface files.
Previous engronkulation concering the binary instance of RdrName has
gone away -- RdrName is not an instance of Binary any more. Nor does
Binary.lhs need to know about the ``current module'' which it used to,
which made it specialised to GHC.
A good feature of this is that the type checker for source code doesn't
need to worry about the possibility that we might be typechecking interface
file stuff. Nor does it need to do renaming; we can typecheck direct from
IfaceSyn, saving a whole pass (module TcIface)
* Stuff from interface files is sucked in *lazily*, rather than being eagerly
sucked in by the renamer. Instead, we use unsafeInterleaveIO to capture
a thunk for the unfolding of an imported function (say). If that unfolding
is every pulled on, TcIface will scramble over the unfolding, which may
in turn pull in the interface files of things mentioned in the unfolding.
The External Package State is held in a mutable variable so that it
can be side-effected by this lazy-sucking-in process (which may happen
way later, e.g. when the simplifier runs). In effect, the EPS is a kind
of lazy memo table, filled in as we suck things in. Or you could think
of it as a global symbol table, populated on demand.
* This lazy sucking is very cool, but it can lead to truly awful bugs. The
intent is that updates to the symbol table happen atomically, but very bad
things happen if you read the variable for the table, and then force a
thunk which updates the table. Updates can get lost that way. I regret
this subtlety.
One example of the way it showed up is that the top level of TidyPgm
(which updates the global name cache) to be much more disciplined about
those updates, since TidyPgm may itself force thunks which allocate new
names.
* Version numbering in interface files has changed completely, fixing
one major bug with ghc --make. Previously, the version of A.f changed
only if A.f's type and unfolding was textually different. That missed
changes to things that A.f's unfolding mentions; which was fixed by
eagerly sucking in all of those things, and listing them in the module's
usage list. But that didn't work with --make, because they might have
been already sucked in.
Now, A.f's version changes if anything reachable from A.f (via interface
files) changes. A module with unchanged source code needs recompiling
only if the versions of any of its free variables changes. [This isn't
quite right for dictionary functions and rules, which aren't mentioned
explicitly in the source. There are extensive comments in module MkIface,
where all version-handling stuff is done.]
* We don't need equality on HsDecls any more (because they aren't used in
interface files). Instead we have a specialised equality for IfaceSyn
(eqIfDecl etc), which uses IfaceEq instead of Bool as its result type.
See notes in IfaceSyn.
* The horrid bit of the renamer that tried to predict what instance decls
would be needed has gone entirely. Instead, the type checker simply
sucks in whatever instance decls it needs, when it needs them. Easy!
Similarly, no need for 'implicitModuleFVs' and 'implicitTemplateHaskellFVs'
etc. Hooray!
Types and type checking
~~~~~~~~~~~~~~~~~~~~~~~
* Kind-checking of types is far far tidier (new module TcHsTypes replaces
the badly-named TcMonoType). Strangely, this was one of my
original goals, because the kind check for types is the Right Place to
do type splicing, but it just didn't fit there before.
* There's a new representation for newtypes in TypeRep.lhs. Previously
they were represented using "SourceTypes" which was a funny compromise.
Now they have their own constructor in the Type datatype. SourceType
has turned back into PredType, which is what it used to be.
* Instance decl overlap checking done lazily. Consider
instance C Int b
instance C a Int
These were rejected before as overlapping, because when seeking
(C Int Int) one couldn't tell which to use. But there's no problem when
seeking (C Bool Int); it can only be the second.
So instead of checking for overlap when adding a new instance declaration,
we check for overlap when looking up an Inst. If we find more than one
matching instance, we see if any of the candidates dominates the others
(in the sense of being a substitution instance of all the others);
and only if not do we report an error.
------------------------
Medium things
------------------------
* The TcRn monad is generalised a bit further. It's now based on utils/IOEnv.lhs,
the IO monad with an environment. The desugarer uses the monad too,
so that anything it needs can get faulted in nicely.
* Reduce the number of wired-in things; in particular Word and Integer
are no longer wired in. The latter required HsLit.HsInteger to get a
Type argument. The 'derivable type classes' data types (:+:, :*: etc)
are not wired in any more either (see stuff about derivable type classes
below).
* The PersistentComilerState is now held in a mutable variable
in the HscEnv. Previously (a) it was passed to and then returned by
many top-level functions, which was painful; (b) it was invariably
accompanied by the HscEnv. This change tidies up top-level plumbing
without changing anything important.
* Derivable type classes are treated much more like 'deriving' clauses.
Previously, the Ids for the to/from functions lived inside the TyCon,
but now the TyCon simply records their existence (with a simple boolean).
Anyone who wants to use them must look them up in the environment.
This in turn makes it easy to generate the to/from functions (done
in types/Generics) using HsSyn (like TcGenDeriv for ordinary derivings)
instead of CoreSyn, which in turn means that (a) we don't have to figure
out all the type arguments etc; and (b) it'll be type-checked for us.
Generally, the task of generating the code has become easier, which is
good for Manuel, who wants to make it more sophisticated.
* A Name now says what its "parent" is. For example, the parent of a data
constructor is its type constructor; the parent of a class op is its
class. This relationship corresponds exactly to the Avail data type;
there may be other places we can exploit it. (I made the change so that
version comparison in interface files would be a bit easier; but in
fact it tided up other things here and there (see calls to
Name.nameParent). For example, the declaration pool, of declararations
read from interface files, but not yet used, is now keyed only by the 'main'
name of the declaration, not the subordinate names.
* New types OccEnv and OccSet, with the usual operations.
OccNames can be efficiently compared, because they have uniques, thanks
to the hashing implementation of FastStrings.
* The GlobalRdrEnv is now keyed by OccName rather than RdrName. Not only
does this halve the size of the env (because we don't need both qualified
and unqualified versions in the env), but it's also more efficient because
we can use a UniqFM instead of a FiniteMap.
Consequential changes to Provenance, which has moved to RdrName.
* External Core remains a bit of a hack, as it was before, done with a mixture
of HsDecls (so that recursiveness and argument variance is still inferred),
and IfaceExprs (for value declarations). It's not thoroughly tested.
------------------------
Minor things
------------------------
* DataCon fields dcWorkId, dcWrapId combined into a single field
dcIds, that is explicit about whether the data con is a newtype or not.
MkId.mkDataConWorkId and mkDataConWrapId are similarly combined into
MkId.mkDataConIds
* Choosing the boxing strategy is done for *source* type decls only, and
hence is now in TcTyDecls, not DataCon.
* WiredIn names are distinguished by their n_sort field, not by their location,
which was rather strange
* Define Maybes.mapCatMaybes :: (a -> Maybe b) -> [a] -> [b]
and use it here and there
* Much better pretty-printing of interface files (--show-iface)
Many, many other small things.
------------------------
File changes
------------------------
* New iface/ subdirectory
* Much of RnEnv has moved to iface/IfaceEnv
* MkIface and BinIface have moved from main/ to iface/
* types/Variance has been absorbed into typecheck/TcTyDecls
* RnHiFiles and RnIfaces have vanished entirely. Their
work is done by iface/LoadIface
* hsSyn/HsCore has gone, replaced by iface/IfaceSyn
* typecheck/TcIfaceSig has gone, replaced by iface/TcIface
* typecheck/TcMonoType has been renamed to typecheck/TcHsType
* basicTypes/Var.hi-boot and basicTypes/Generics.hi-boot have gone altogether
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--------------------------------------
Make Template Haskell into the HEAD
--------------------------------------
This massive commit transfers to the HEAD all the stuff that
Simon and Tim have been doing on Template Haskell. The
meta-haskell-branch is no more!
WARNING: make sure that you
* Update your links if you are using link trees.
Some modules have been added, some have gone away.
* Do 'make clean' in all library trees.
The interface file format has changed, and you can
get strange panics (sadly) if GHC tries to read old interface files:
e.g. ghc-5.05: panic! (the `impossible' happened, GHC version 5.05):
Binary.get(TyClDecl): ForeignType
* You need to recompile the rts too; Linker.c has changed
However the libraries are almost unaltered; just a tiny change in
Base, and to the exports in Prelude.
NOTE: so far as TH itself is concerned, expression splices work
fine, but declaration splices are not complete.
---------------
The main change
---------------
The main structural change: renaming and typechecking have to be
interleaved, because we can't rename stuff after a declaration splice
until after we've typechecked the stuff before (and the splice
itself).
* Combine the renamer and typecheker monads into one
(TcRnMonad, TcRnTypes)
These two replace TcMonad and RnMonad
* Give them a single 'driver' (TcRnDriver). This driver
replaces TcModule.lhs and Rename.lhs
* The haskell-src library package has a module
Language/Haskell/THSyntax
which defines the Haskell data type seen by the TH programmer.
* New modules:
hsSyn/Convert.hs converts THSyntax -> HsSyn
deSugar/DsMeta.hs converts HsSyn -> THSyntax
* New module typecheck/TcSplice type-checks Template Haskell splices.
-------------
Linking stuff
-------------
* ByteCodeLink has been split into
ByteCodeLink (which links)
ByteCodeAsm (which assembles)
* New module ghci/ObjLink is the object-code linker.
* compMan/CmLink is removed entirely (was out of place)
Ditto CmTypes (which was tiny)
* Linker.c initialises the linker when it is first used (no need to call
initLinker any more). Template Haskell makes it harder to know when
and whether to initialise the linker.
-------------------------------------
Gathering the LIE in the type checker
-------------------------------------
* Instead of explicitly gathering constraints in the LIE
tcExpr :: RenamedExpr -> TcM (TypecheckedExpr, LIE)
we now dump the constraints into a mutable varabiable carried
by the monad, so we get
tcExpr :: RenamedExpr -> TcM TypecheckedExpr
Much less clutter in the code, and more efficient too.
(Originally suggested by Mark Shields.)
-----------------
Remove "SysNames"
-----------------
Because the renamer and the type checker were entirely separate,
we had to carry some rather tiresome implicit binders (or "SysNames")
along inside some of the HsDecl data structures. They were both
tiresome and fragile.
Now that the typechecker and renamer are more intimately coupled,
we can eliminate SysNames (well, mostly... default methods still
carry something similar).
-------------
Clean up HsPat
-------------
One big clean up is this: instead of having two HsPat types (InPat and
OutPat), they are now combined into one. This is more consistent with
the way that HsExpr etc is handled; there are some 'Out' constructors
for the type checker output.
So:
HsPat.InPat --> HsPat.Pat
HsPat.OutPat --> HsPat.Pat
No 'pat' type parameter in HsExpr, HsBinds, etc
Constructor patterns are nicer now: they use
HsPat.HsConDetails
for the three cases of constructor patterns:
prefix, infix, and record-bindings
The *same* data type HsConDetails is used in the type
declaration of the data type (HsDecls.TyData)
Lots of associated clean-up operations here and there. Less code.
Everything is wonderful.
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Housekeeping:
- The main goal is to remove dependencies on hslibs for a
bootstrapped compiler, leaving only a requirement that the
packages base, haskell98 and readline are built in stage 1 in
order to bootstrap. We're almost there: Posix is still required
for signal handling, but all other dependencies on hslibs are now
gone.
Uses of Addr and ByteArray/MutableByteArray array are all gone
from the compiler. PrimPacked defines the Ptr type for GHC 4.08
(which didn't have it), and it defines simple BA and MBA types to
replace uses of ByteArray and MutableByteArray respectively.
- Clean up import lists. HsVersions.h now defines macros for some
modules which have moved between GHC versions. eg. one now
imports 'GLAEXTS' to get at unboxed types and primops in the
compiler.
Many import lists have been sorted as per the recommendations in
the new style guidelines in the commentary.
I've built the compiler with GHC 4.08.2, 5.00.2, 5.02.3, 5.04 and
itself, and everything still works here. Doubtless I've got something
wrong, though.
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In hPutLitString, catch the empty string case before calling hPutBuf.
Some older versions of hPutBufFull choke on a zero-length buffer.
Fixes occasional problems with the Sparc native code generator, which
uses SLIT("") in a couple of places.
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Include hschooks.h via a global option to get ghc_strlen's
prototype. It's too omnipresent for per-file OPTIONS.
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Re-enable bootstrapping: More Ptr trouble, now that it's (almost) abstract...
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- Fix bootstrapped compilation,
- Add the following RULE:
text "abc" ==> ptext SLIT("abc")
so most of the time there shouldn't be any need to use SLIT().
I'll go around and apply the opposite of the above RULE once
I've convinced myself that the RULE does what it should.
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FastString cleanup, stage 1.
The FastString type is no longer a mixture of hashed strings and
literal strings, it contains hashed strings only with O(1) comparison
(except for UnicodeStr, but that will also go away in due course). To
create a literal instance of FastString, use FSLIT("..").
By far the most common use of the old literal version of FastString
was in the pattern
ptext SLIT("...")
this combination still works, although it doesn't go via FastString
any more. The next stage will be to remove the need to use this
special combination at all, using a RULE.
To convert a FastString into an SDoc, now use 'ftext' instead of
'ptext'.
I've also removed all the FAST_STRING related macros from HsVersions.h
except for SLIT and FSLIT, just use the relevant functions from
FastString instead.
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fromInt ==> fromIntegral
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Updates to the native code generator following the changes to fix the
large block allocation bug, and changes to use the new
function-address cache in the register table to reduce code size.
Also: I changed the pretty-printing machinery for assembly code to use
Pretty rather than Outputable, since we don't make use of the styles
and it should improve performance. Perhaps the same should be done
for abstract C.
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Move FAST_INT and FAST_BOOL into their own module FastTypes, replacing
the macro definitions in HsVersions.h with real definitions. Change
most of the names in the process.
Now we don't get bogus imports of GlaExts all over the place, and
-fwarn-unused-imports is less noisy.
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~~~~~~~~~~~~
Apr/May 2000
~~~~~~~~~~~~
This is a pretty big commit! It adds stuff I've been working on
over the last month or so. DO NOT MERGE IT WITH 4.07!
Interface file formats have changed a little; you'll need
to make clean before remaking.
Simon PJ
Recompilation checking
~~~~~~~~~~~~~~~~~~~~~~
Substantial improvement in recompilation checking. The version management
is now entirely internal to GHC. ghc-iface.lprl is dead!
The trick is to generate the new interface file in two steps:
- first convert Types etc to HsTypes etc, and thereby
build a new ParsedIface
- then compare against the parsed (but not renamed) version of the old
interface file
Doing this meant adding code to convert *to* HsSyn things, and to
compare HsSyn things for equality. That is the main tedious bit.
Another improvement is that we now track version info for
fixities and rules, which was missing before.
Interface file reading
~~~~~~~~~~~~~~~~~~~~~~
Make interface files reading more robust.
* If the old interface file is unreadable, don't fail. [bug fix]
* If the old interface file mentions interfaces
that are unreadable, don't fail. [bug fix]
* When we can't find the interface file,
print the directories we are looking in. [feature]
Type signatures
~~~~~~~~~~~~~~~
* New flag -ddump-types to print type signatures
Type pruning
~~~~~~~~~~~~
When importing
data T = T1 A | T2 B | T3 C
it seems excessive to import the types A, B, C as well, unless
the constructors T1, T2 etc are used. A,B,C might be more types,
and importing them may mean reading more interfaces, and so on.
So the idea is that the renamer will just import the decl
data T
unless one of the constructors is used. This turns out to be quite
easy to implement. The downside is that we must make sure the
constructors are always available if they are really needed, so
I regard this as an experimental feature.
Elimininate ThinAir names
~~~~~~~~~~~~~~~~~~~~~~~~~
Eliminate ThinAir.lhs and all its works. It was always a hack, and now
the desugarer carries around an environment I think we can nuke ThinAir
altogether.
As part of this, I had to move all the Prelude RdrName defns from PrelInfo
to PrelMods --- so I renamed PrelMods as PrelNames.
I also had to move the builtinRules so that they are injected by the renamer
(rather than appearing out of the blue in SimplCore). This is if anything simpler.
Miscellaneous
~~~~~~~~~~~~~
* Tidy up the data types involved in Rules
* Eliminate RnEnv.better_provenance; use Name.hasBetterProv instead
* Add Unique.hasKey :: Uniquable a => a -> Unique -> Bool
It's useful in a lot of places
* Fix a bug in interface file parsing for __U[!]
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Remove fromRational junk, use Numeric.fromRat instead
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remove more version cruft.
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The Great Multi-Parameter Type Classes Merge.
Notes from Simon (abridged):
* Multi-parameter type classes are fully implemented.
* Error messages from the type checker should be noticeably improved
* Warnings for unused bindings (-fwarn-unused-names)
* many other minor bug fixes.
Internally there are the following changes
* Removal of Haskell 1.2 compatibility.
* Dramatic clean-up of the PprStyle stuff.
* The type Type has been substantially changed.
* The dictionary for each class is represented by a new
data type for that purpose, rather than by a tuple.
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More small changes to 2.04
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Updated imports
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New glorious PP machinery
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Major update to more-or-less 2.02
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SLPJ new renamer and lots more
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Bulk of final changes for 2.01
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SLPJ 1.3 changes through 96/06/25
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SLPJ changes through 960604
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SLPJ changes through 960515
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Add SLPJ/WDP 1.3 changes through 960404
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simonpj/sansom/partain/dnt 1.3 compiler stuff through 96/03/18
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Initial revision
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