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'tcRnModuleTcRnM' builds the TcRnM monad computation that is the bulk of
'tcRnModule'

This commit makes it simpler for courageous Core plugins to invoke the
typechecker. In particular, they no longer need to copy-and-paste what is now
the body of 'tcRnModuleTcRnM'. The key change is that the 'tcRnModuleTcRnM'
computation can be run with (a hypothetical) 'initTcFromCoreM' instead of
'initTc'.

This patch makes a number of related improvements:

* Displays relevant bindings in innermost-first order.
  The inner ones are closer to the error.

* Does not display syntactically top-level bindings,
  unless you say -fno-max-relevant-bindings.
  This is what Trac #8233 was mainly about

* Makes the TopLevelFlag in a TcIdBinder really mean
  "syntactically top level".  It was a bit vague before.

There was some associated simplification, because we no longer
need to pas a TopLevelFlag to tcMonoBinds and friends.

See Note [Quantification with errors]
Fixes Trac #8262

This is what I get for being so hasty for release notes.
Signed-off-by: Austin Seipp <austin@well-typed.com>

Signed-off-by: Austin Seipp <austin@well-typed.com>

Signed-off-by: Austin Seipp <austin@well-typed.com>

7.6 deprecated the Control.Concurrent.QSem module (to be removed later,)
but according to Patrick it was actually un-deprecated. As a result,
validate fails if your bootstrap compiler is 7.6, since it throws a
DEPRECATED warning.
Signed-off-by: Austin Seipp <austin@well-typed.com>

In 9e133b, the build was modified to pass -fcmm-sink to Parser, but
unfortunately Parser specifies -O0 in its OPTIONS_GHC directive, meaning
the sinking pass was actually turned off.

HC_OPTS is the last thing passed to the compiler for that source file
however, so the correct fix is to also move -O0 out into the build
system as well.

This was uncovered thanks to a build report from Kazu Yamamoto. Thanks
to Jan Stolarek for eyeballing this bug and finding it.
Signed-off-by: Austin Seipp <aseipp@pobox.com>

This reverts commit c798a8c6.

This reverts commit d85044f6.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

This reverts commit 6770663f.

If the program enters the garbage collector with the closure
lock held, it will confuse the garbage collector and will
result in an infinite loop in evacuate().
Signed-off-by: Austin Seipp <aseipp@pobox.com>

When servicing a stack overflows, only throw an exception to the given
thread if the user explicitly set a max stack size, using +RTS -K.
Otherwise just service it normally and grow the stack.

In case we actually run out of *heap* (stack chuncks are allocated on
the heap), then we need to bail by calling the stackOverflow() hook and
exit immediately.
Authored-by: Ben Gamari <bgamari.foss@gmail.com>
Signed-off-by: Austin Seipp <aseipp@pobox.com>

also added -fdmd-tx-dict-sel, on by default

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

It was sorted by version number so far.

I also added a sort to the normal output (without --simple-output)
since the source it comes from does not guarantee sortedness.
Signed-off-by: Austin Seipp <aseipp@pobox.com>

This patch encompasses most of the basic infrastructure for GHCJS. It
includes:

  * A new extension, -XJavaScriptFFI
  * A new architecture, ArchJavaScript
  * Parser and lexer support for 'foreign import javascript', only
    available under -XJavaScriptFFI, using ArchJavaScript.
  * As a knock-on, there is also a new 'WayCustom' constructor in
    DynFlags, so clients of the GHC API can add custom 'tags' to their
    built files. This should be useful for other users as well.

The remaining changes are really just the resulting fallout, making sure
all the cases are handled appropriately for DynFlags and Platform.
Authored-by: Luite Stegeman <stegeman@gmail.com>
Signed-off-by: Austin Seipp <aseipp@pobox.com>

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

Authored-by: Luke Iannini <lukexi@me.com>
Signed-off-by: Austin Seipp <aseipp@pobox.com>

We can no longer use atomic_inc() in the stage1 compiler because its
prototype was recently changed.

Since the stage1 compiler is always single-threaded, only use
atomic_inc() when THREADED_RTS is defined.

Under --slow, the DPH tests can take incredible amounts of time to run.
And on some platforms, we may not have a fully working linker in order
to build DPH etc anyway. So this provides a way to turn it off.

This flag is off by default, but should your specify it, you can skip
the required 'dph' libraries in a build, should you remove them from the
source tree.
Signed-off-by: Austin Seipp <aseipp@pobox.com>

Parser.hs needs to be compiled with -fcmm-sink on x86 platforms, so the
register allocator doesn't run out of stack slots. Previously, we had to
do some CPP hacks in order to emit an #ifdef into the file - this is
because we preprocess it once up front, and run the preprocessor again
when we compile it.

There's two cases: the boostrap compiler is > 7.8, and the stage1 parser
needs the flag, or the stage1 compiler is compiling the stage2
Parser.hs, and needs the flag..

The previous approach was super fragile with Clang. The more principled
fix is to instead do this through the build system.

This fixes #8182.
Signed-off-by: Austin Seipp <aseipp@pobox.com>