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Makes the needed changes to make RemoteGHCi work on Windows.
The approach passes OS Handles areound instead of the Posix Fd
as on Linux.
The reason is that I could not find any real documentation about
the behaviour of Windows w.r.t inheritance and Posix FDs.
The implementation with Fd did not seem to be able to find the Fd
in the child process. Instead I'm using the much better documented
approach of passing inheriting handles.
This requires a small modification to the `process` library.
https://github.com/haskell/process/pull/52
Test Plan: ./validate On Windows x86_64
Reviewers: thomie, erikd, bgamari, simonmar, austin, hvr
Reviewed By: simonmar
Subscribers: #ghc_windows_task_force
Differential Revision: https://phabricator.haskell.org/D1836
GHC Trac Issues: #11100
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This updates the haddock submodule
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In order to simplify the task, the version munging logic has
been radically simplified:
Previously, in cases where the version contained dates as version components,
the build-system would munge the version of the stage1 ghc package before
registering the `ghc` package.
However, this hack was already questionable at the time of its introduction
(c.f. 7b45c46cbabe1288ea87bd9b94c57e010ed17e60).
Simplifying the build-systems by avoiding such hacks may also help the
shaking-up-ghc effort.
So now we simply munge directly via the `.cabal` files, which gives a simpler
picture, as now every stage is munged the same. Munging is only active when
the first patch-level version component is a date. So stable snapshots and release
candidates are unaffacted (as those have the date in the second patch-level
version component)
Reviewers: simonmar, bgamari, austin, thomie, ezyang
Reviewed By: bgamari, thomie, ezyang
Differential Revision: https://phabricator.haskell.org/D1673
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Summary:
(Apologies for the size of this patch, I couldn't make a smaller one
that was validate-clean and also made sense independently)
(Some of this code is derived from GHCJS.)
This commit adds support for running interpreted code (for GHCi and
TemplateHaskell) in a separate process. The functionality is
experimental, so for now it is off by default and enabled by the flag
-fexternal-interpreter.
Reaosns we want this:
* compiling Template Haskell code with -prof does not require
building the code without -prof first
* when GHC itself is profiled, it can interpret unprofiled code, and
the same applies to dynamic linking. We would no longer need to
force -dynamic-too with TemplateHaskell, and we can load ordinary
objects into a dynamically-linked GHCi (and vice versa).
* An unprofiled GHCi can load and run profiled code, which means it
can use the stack-trace functionality provided by profiling without
taking the performance hit on the compiler that profiling would
entail.
Amongst other things; see
https://ghc.haskell.org/trac/ghc/wiki/RemoteGHCi for more details.
Notes on the implementation are in Note [Remote GHCi] in the new
module compiler/ghci/GHCi.hs. It probably needs more documenting,
feel free to suggest things I could elaborate on.
Things that are not currently implemented for -fexternal-interpreter:
* The GHCi debugger
* :set prog, :set args in GHCi
* `recover` in Template Haskell
* Redirecting stdin/stdout for the external process
These are all doable, I just wanted to get to a working validate-clean
patch first.
I also haven't done any benchmarking yet. I expect there to be slight hit
to link times for byte code and some penalty due to having to
serialize/deserialize TH syntax, but I don't expect it to be a serious
problem. There's also lots of low-hanging fruit in the byte code
generator/linker that we could exploit to speed things up.
Test Plan:
* validate
* I've run parts of the test suite with
EXTRA_HC_OPTS=-fexternal-interpreter, notably tests/ghci and tests/th.
There are a few failures due to the things not currently implemented
(see above).
Reviewers: simonpj, goldfire, ezyang, austin, alanz, hvr, niteria, bgamari, gibiansky, luite
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1562
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