Tom Tromey 4ecee2c47d Introduce gdbpy_enter ...

This introduces gdbpy_enter, a class that can be used to acquire and
release the Python GIL, and also set other Python-related globals used
by gdb.  ensure_python_env is rewritten in terms of this new class.

2017-01-10  Tom Tromey  <tom@tromey.com>

	* python/python.c (gdbpy_enter): New constructor.
	(~gdbpy_enter): New destructor.
	(restore_python_env, ensure_python_env): Rewrite.
	* python/python-internal.h (gdbpy_enter): New class.

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..

lib/gdb

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py-arch.c

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py-auto-load.c

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py-block.c

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py-bpevent.c

Change event code to use gdbpy_ref

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py-breakpoint.c

Use gdbpy_ref in gdbpy_breakpoints

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py-cmd.c

Use gdbpy_ref in gdbpy_string_to_argv

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py-continueevent.c

Change event code to use gdbpy_ref

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py-event.c

Change event code to use gdbpy_ref

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py-event.h

Change event code to use gdbpy_ref

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py-events.h

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py-evtregistry.c

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py-evts.c

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py-exitedevent.c

Change event code to use gdbpy_ref

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py-finishbreakpoint.c

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py-frame.c

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py-framefilter.c

Use gdbpy_ref in py-framefilter.c

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py-function.c

Use gdbpy_ref in py-function.c

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py-gdb-readline.c

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py-inferior.c

Use gdbpy_ref in gdbpy_inferiors

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py-infevents.c

Change event code to use gdbpy_ref

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py-infthread.c

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py-lazy-string.c

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py-linetable.c

Use gdbpy_ref in py-linetable.c

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py-newobjfileevent.c

Change event code to use gdbpy_ref

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py-objfile.c

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py-param.c

Use gdbpy_ref in call_doc_function

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py-prettyprint.c

Use gdbpy_ref in py-prettyprint.c

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py-progspace.c

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py-ref.h

Introduce py-ref.h

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py-signalevent.c

Change event code to use gdbpy_ref

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py-stopevent.c

Change event code to use gdbpy_ref

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py-stopevent.h

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py-symbol.c

Use gdbpy_ref in gdbpy_lookup_symbol

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py-symtab.c

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py-threadevent.c

Change event code to use gdbpy_ref

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py-type.c

Use gdbpy_ref in py-type.c

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py-unwind.c

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py-utils.c

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py-value.c

Use gdbpy_ref in py-value.c

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py-varobj.c

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py-xmethods.c

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python-config.py

…

python-internal.h

Introduce gdbpy_enter

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python.c

Introduce gdbpy_enter

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python.h

update copyright year range in GDB files

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