#11100: Remote GHCi
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Reporter: simonmar | Owner: simonmar
Type: task | Status: new
Priority: normal | Milestone: 8.0.1
Component: GHCi | Version: 7.10.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: #11047, #8736 | Differential Rev(s):
Wiki Page: | Phab:D1562,Phab:D1747,Phab:D1748
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Comment (by Simon Marlow ):
In [changeset:"6be09e884730f19da6c24fc565980f515300e53c/ghc" 6be09e8/ghc]:
{{{
#!CommitTicketReference repository="ghc"
revision="6be09e884730f19da6c24fc565980f515300e53c"
Enable stack traces with ghci -fexternal-interpreter -prof
Summary:
The main goal here is enable stack traces in GHCi. After this change,
if you start GHCi like this:
ghci -fexternal-interpreter -prof
(which requires packages to be built for profiling, but not GHC
itself) then the interpreter manages cost-centre stacks during
execution and can produce a stack trace on request. Call locations
are available for all interpreted code, and any compiled code that was
built with the `-fprof-auto` familiy of flags.
There are a couple of ways to get a stack trace:
* `error`/`undefined` automatically get one attached
* `Debug.Trace.traceStack` can be used anywhere, and prints the current
stack
Because the interpreter is running in a separate process, only the
interpreted code is running in profiled mode and the compiler itself
isn't slowed down by profiling.
The GHCi debugger still doesn't work with -fexternal-interpreter,
although this patch gets it a step closer. Most of the functionality
of breakpoints is implemented, but the runtime value introspection is
still not supported.
Along the way I also did some refactoring and added type arguments to
the various remote pointer types in `GHCi.RemotePtr`, so there's
better type safety and documentation in the bridge code between GHC
and ghc-iserv.
Test Plan: validate
Reviewers: bgamari, ezyang, austin, hvr, goldfire, erikd
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1747
GHC Trac Issues: #11047, #11100
}}}
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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11100#comment:6
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