Convert observers to C++

This converts observers from using a special source-generating script
to be plain C++.  This version of the patch takes advantage of C++11
by using std::function and variadic templates; incorporates Pedro's
patches; and renames the header file to "observable.h" (this change
eliminates the need for a clean rebuild).

Note that Pedro's patches used a template lambda in tui-hooks.c, but
this failed to compile on some buildbot instances (presumably due to
differing C++ versions); I replaced this with an ordinary template
function.

Regression tested on the buildbot.

gdb/ChangeLog
2018-03-19  Pedro Alves  <palves@redhat.com>
	    Tom Tromey  <tom@tromey.com>

	* unittests/observable-selftests.c: New file.
	* common/observable.h: New file.
	* observable.h: New file.
	* ada-lang.c, ada-tasks.c, agent.c, aix-thread.c, annotate.c,
	arm-tdep.c, auto-load.c, auxv.c, break-catch-syscall.c,
	breakpoint.c, bsd-uthread.c, cli/cli-interp.c, cli/cli-setshow.c,
	corefile.c, dummy-frame.c, event-loop.c, event-top.c, exec.c,
	extension.c, frame.c, gdbarch.c, guile/scm-breakpoint.c,
	infcall.c, infcmd.c, inferior.c, inflow.c, infrun.c, jit.c,
	linux-tdep.c, linux-thread-db.c, m68klinux-tdep.c,
	mi/mi-cmd-break.c, mi/mi-interp.c, mi/mi-main.c, objfiles.c,
	ppc-linux-nat.c, ppc-linux-tdep.c, printcmd.c, procfs.c,
	python/py-breakpoint.c, python/py-finishbreakpoint.c,
	python/py-inferior.c, python/py-unwind.c, ravenscar-thread.c,
	record-btrace.c, record-full.c, record.c, regcache.c, remote.c,
	riscv-tdep.c, sol-thread.c, solib-aix.c, solib-spu.c, solib.c,
	spu-multiarch.c, spu-tdep.c, stack.c, symfile-mem.c, symfile.c,
	symtab.c, thread.c, top.c, tracepoint.c, tui/tui-hooks.c,
	tui/tui-interp.c, valops.c: Update all users.
	* tui/tui-hooks.c (tui_bp_created_observer)
	(tui_bp_deleted_observer, tui_bp_modified_observer)
	(tui_inferior_exit_observer, tui_before_prompt_observer)
	(tui_normal_stop_observer, tui_register_changed_observer):
	Remove.
	(tui_observers_token): New global.
	(attach_or_detach, tui_attach_detach_observers): New functions.
	(tui_install_hooks, tui_remove_hooks): Use
	tui_attach_detach_observers.
	* record-btrace.c (record_btrace_thread_observer): Remove.
	(record_btrace_thread_observer_token): New global.
	* observer.sh: Remove.
	* observer.c: Rename to observable.c.
	* observable.c (namespace gdb_observers): Define new objects.
	(observer_debug): Move into gdb_observers namespace.
	(struct observer, struct observer_list, xalloc_observer_list_node)
	(xfree_observer_list_node, generic_observer_attach)
	(generic_observer_detach, generic_observer_notify): Remove.
	(_initialize_observer): Update.
	Don't include observer.inc.
	* Makefile.in (generated_files): Remove observer.h, observer.inc.
	(clean mostlyclean): Likewise.
	(observer.h, observer.inc): Remove targets.
	(SUBDIR_UNITTESTS_SRCS): Add observable-selftests.c.
	(COMMON_SFILES): Use observable.c, not observer.c.
	* .gitignore: Remove observer.h.

gdb/doc/ChangeLog
2018-03-19  Tom Tromey  <tom@tromey.com>

	* observer.texi: Remove.

gdb/testsuite/ChangeLog
2018-03-19  Tom Tromey  <tom@tromey.com>

	* gdb.gdb/observer.exp: Remove.

1 files changed, 3 insertions, 10 deletions

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 44db193..4dd9286 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -423,6 +423,7 @@ SUBDIR_UNITTESTS_SRCS = \
 	unittests/memory-map-selftests.c \
 	unittests/memrange-selftests.c \
 	unittests/offset-type-selftests.c \
+	unittests/observable-selftests.c \
 	unittests/optional-selftests.c \
 	unittests/ptid-selftests.c \
 	unittests/rsp-low-selftests.c \
@@ -1057,7 +1058,7 @@ COMMON_SFILES = \
 	namespace.c \
 	objc-lang.c \
 	objfiles.c \
-	observer.c \
+	observable.c \
 	opencl-lang.c \
 	osabi.c \
 	osdata.c \
@@ -1589,8 +1590,6 @@ generated_files = \
 	config.h \
 	gcore \
 	jit-reader.h \
-	observer.h \
-	observer.inc \
 	$(GNULIB_H) \
 	$(NAT_GENERATED_FILES)
 
@@ -1950,7 +1949,7 @@ tags: TAGS
 clean mostlyclean: $(CONFIG_CLEAN)
 	@$(MAKE) $(FLAGS_TO_PASS) DO=clean "DODIRS=$(CLEANDIRS)" subdir_do
 	rm -f *.o *.a $(ADD_FILES) *~ init.c-tmp init.l-tmp version.c-tmp
-	rm -f init.c version.c observer.h observer.inc
+	rm -f init.c version.c
 	rm -f gdb$(EXEEXT) core make.log
 	rm -f gdb[0-9]$(EXEEXT)
 	rm -f test-cp-name-parser$(EXEEXT)
@@ -2137,12 +2136,6 @@ version.c: Makefile version.in $(srcdir)/../bfd/version.h $(srcdir)/common/creat
 	$(ECHO_GEN) $(SHELL) $(srcdir)/common/create-version.sh $(srcdir) \
 	    $(host_alias) $(target_alias) version.c
 
-observer.h: observer.sh doc/observer.texi
-	${srcdir}/observer.sh h ${srcdir}/doc/observer.texi observer.h
-
-observer.inc: observer.sh doc/observer.texi
-	${srcdir}/observer.sh inc ${srcdir}/doc/observer.texi observer.inc
-
 lint: $(LINTFILES)
 	$(LINT) $(INCLUDE_CFLAGS) $(LINTFLAGS) $(LINTFILES) \
 	   `echo $(DEPFILES) $(CONFIG_OBS) | sed 's/\.o /\.c /g'`