2003-10-21 Arnaud Charlet <charlet@act-europe.fr>

	* 3psoccon.ads, 3veacodu.adb, 3vexpect.adb, 3vsoccon.ads,
	3vsocthi.adb, 3vsocthi.ads, 3vtrasym.adb, 3zsoccon.ads,
	3zsocthi.adb, 3zsocthi.ads, 50system.ads, 51system.ads,
	55system.ads, 56osinte.adb, 56osinte.ads, 56taprop.adb,
	56taspri.ads, 56tpopsp.adb, 57system.ads, 58system.ads,
	59system.ads, 5aml-tgt.adb, 5bml-tgt.adb, 5csystem.ads,
	5dsystem.ads, 5fosinte.adb, 5gml-tgt.adb, 5hml-tgt.adb,
	5isystem.ads, 5lparame.adb, 5msystem.ads, 5psystem.ads,
	5sml-tgt.adb, 5sosprim.adb, 5stpopsp.adb, 5tsystem.ads,
	5usystem.ads, 5vml-tgt.adb, 5vsymbol.adb, 5vtraent.adb,
	5vtraent.ads, 5wml-tgt.adb, 5xparame.ads, 5xsystem.ads,
	5xvxwork.ads, 5yparame.ads, 5ytiitho.adb, 5zinit.adb,
	5zml-tgt.adb, 5zparame.ads, 5ztaspri.ads, 5ztfsetr.adb,
	5zthrini.adb, 5ztiitho.adb, 5ztpopsp.adb, 7stfsetr.adb,
	7straces.adb, 7strafor.adb, 7strafor.ads, 7stratas.adb,
	a-excach.adb, a-exexda.adb, a-exexpr.adb, a-exextr.adb,
	a-exstat.adb, a-strsup.adb, a-strsup.ads, a-stwisu.adb,
	a-stwisu.ads, bld.adb, bld.ads, bld-io.adb,
	bld-io.ads, clean.adb, clean.ads, ctrl_c.c,
	erroutc.adb, erroutc.ads, errutil.adb, errutil.ads,
	err_vars.ads, final.c, g-arrspl.adb, g-arrspl.ads,
	g-boubuf.adb, g-boubuf.ads, g-boumai.ads, g-bubsor.adb,
	g-bubsor.ads, g-comver.adb, g-comver.ads, g-ctrl_c.ads,
	g-dynhta.adb, g-dynhta.ads, g-eacodu.adb, g-excact.adb,
	g-excact.ads, g-heasor.adb, g-heasor.ads, g-memdum.adb,
	g-memdum.ads, gnatclean.adb, gnatsym.adb, g-pehage.adb,
	g-pehage.ads, g-perhas.ads, gpr2make.adb, gpr2make.ads,
	gprcmd.adb, gprep.adb, gprep.ads, g-semaph.adb,
	g-semaph.ads, g-string.adb, g-string.ads, g-strspl.ads,
	g-wistsp.ads, i-vthrea.adb, i-vthrea.ads, i-vxwoio.adb,
	i-vxwoio.ads, Makefile.generic, Makefile.prolog, Makefile.rtl,
	prep.adb, prep.ads, prepcomp.adb, prepcomp.ads,
	prj-err.adb, prj-err.ads, s-boarop.ads, s-carsi8.adb,
	s-carsi8.ads, s-carun8.adb, s-carun8.ads, s-casi16.adb,
	s-casi16.ads, s-casi32.adb, s-casi32.ads, s-casi64.adb,
	s-casi64.ads, s-casuti.adb, s-casuti.ads, s-caun16.adb,
	s-caun16.ads, s-caun32.adb, s-caun32.ads, s-caun64.adb,
	s-caun64.ads, scng.adb, scng.ads, s-exnint.adb,
	s-exnllf.adb, s-exnlli.adb, s-expint.adb, s-explli.adb,
	s-geveop.adb, s-geveop.ads, s-hibaen.ads, s-htable.adb,
	s-htable.ads, sinput-c.adb, sinput-c.ads, s-memcop.ads,
	socket.c, s-purexc.ads, s-scaval.adb, s-stopoo.adb,
	s-strcom.adb, s-strcom.ads, s-strxdr.adb, s-rident.ads,
	s-thread.adb, s-thread.ads, s-tpae65.adb, s-tpae65.ads,
	s-tporft.adb, s-traent.adb, s-traent.ads, styleg.adb,
	styleg.ads, styleg-c.adb, styleg-c.ads, s-veboop.adb,
	s-veboop.ads, s-vector.ads, symbols.adb, symbols.ads,
	tb-alvms.c, tb-alvxw.c, tempdir.adb, tempdir.ads,
	vms_conv.ads, vms_conv.adb, vms_data.ads,
	vxaddr2line.adb: Files added. Merge with ACT tree.

	* 4dintnam.ads, 4mintnam.ads, 4uintnam.ads, 52system.ads,
	5dosinte.ads, 5etpopse.adb, 5mosinte.ads, 5qosinte.adb,
	5qosinte.ads, 5qstache.adb, 5qtaprop.adb, 5qtaspri.ads,
	5stpopse.adb, 5uintman.adb, 5uosinte.ads, adafinal.c,
	g-enblsp.adb, io-aux.c, scn-nlit.adb, scn-slit.adb,
	s-exnflt.ads, s-exngen.adb, s-exngen.ads, s-exnlfl.ads,
	s-exnlin.ads, s-exnsfl.ads, s-exnsin.ads, s-exnssi.ads,
	s-expflt.ads, s-expgen.adb, s-expgen.ads, s-explfl.ads,
	s-explin.ads, s-expllf.ads, s-expsfl.ads, s-expsin.ads,
	s-expssi.ads, style.adb: Files removed. Merge with ACT tree.

	* 1ic.ads, 31soccon.ads, 31soliop.ads, 3asoccon.ads,
	3bsoccon.ads, 3gsoccon.ads, 3hsoccon.ads, 3ssoccon.ads,
	3ssoliop.ads, 3wsoccon.ads, 3wsocthi.adb, 3wsocthi.ads,
	3wsoliop.ads, 41intnam.ads, 42intnam.ads, 4aintnam.ads,
	4cintnam.ads, 4gintnam.ads, 4hexcpol.adb, 4hintnam.ads,
	4lintnam.ads, 4nintnam.ads, 4ointnam.ads, 4onumaux.ads,
	4pintnam.ads, 4sintnam.ads, 4vcaldel.adb, 4vcalend.adb,
	4vintnam.ads, 4wexcpol.adb, 4wintnam.ads, 4zintnam.ads,
	51osinte.adb, 51osinte.ads, 52osinte.adb, 52osinte.ads,
	53osinte.ads, 54osinte.ads, 5aosinte.adb, 5aosinte.ads,
	5asystem.ads, 5ataprop.adb, 5atasinf.ads, 5ataspri.ads,
	5atpopsp.adb, 5avxwork.ads, 5bosinte.adb, 5bosinte.ads,
	5bsystem.ads, 5cosinte.ads, 5esystem.ads, 5fintman.adb,
	5fosinte.ads, 5fsystem.ads, 5ftaprop.adb, 5ftasinf.ads,
	5ginterr.adb, 5gintman.adb, 5gmastop.adb, 5gosinte.ads,
	5gproinf.ads, 5gsystem.ads, 5gtaprop.adb, 5gtasinf.ads,
	5gtpgetc.adb, 5hosinte.adb, 5hosinte.ads, 5hsystem.ads,
	5htaprop.adb, 5htaspri.ads, 5htraceb.adb, 5iosinte.adb,
	5itaprop.adb, 5itaspri.ads, 5ksystem.ads, 5kvxwork.ads,
	5lintman.adb, 5lml-tgt.adb, 5losinte.ads, 5lsystem.ads,
	5mvxwork.ads, 5ninmaop.adb, 5nintman.adb, 5nosinte.ads,
	5ntaprop.adb, 5ntaspri.ads, 5ointerr.adb, 5omastop.adb,
	5oosinte.adb, 5oosinte.ads, 5oosprim.adb, 5oparame.adb,
	5osystem.ads, 5otaprop.adb, 5otaspri.ads, 5posinte.ads,
	5posprim.adb, 5pvxwork.ads, 5sintman.adb, 5sosinte.adb,
	5sosinte.ads, 5ssystem.ads, 5staprop.adb, 5stasinf.ads,
	5staspri.ads, 5svxwork.ads, 5tosinte.ads, 5vasthan.adb,
	5vinmaop.adb, 5vinterr.adb, 5vintman.adb, 5vintman.ads,
	5vmastop.adb, 5vosinte.adb, 5vosinte.ads, 5vosprim.adb,
	5vsystem.ads, 5vtaprop.adb, 5vtaspri.ads, 5vtpopde.adb,
	5vtpopde.ads, 5wgloloc.adb, 5wintman.adb, 5wmemory.adb,
	5wosprim.adb, 5wsystem.ads, 5wtaprop.adb, 5wtaspri.ads,
	5ysystem.ads, 5zinterr.adb, 5zintman.adb, 5zosinte.adb,
	5zosinte.ads, 5zosprim.adb, 5zsystem.ads, 5ztaprop.adb,
	6vcpp.adb, 6vcstrea.adb, 6vinterf.ads, 7sinmaop.adb,
	7sintman.adb, 7sosinte.adb, 7sosprim.adb, 7staprop.adb,
	7staspri.ads, 7stpopsp.adb, 7straceb.adb, 9drpc.adb,
	a-caldel.adb, a-caldel.ads, a-charac.ads, a-colien.ads,
	a-comlin.adb, adaint.c, adaint.h, ada-tree.def,
	a-diocst.adb, a-diocst.ads, a-direio.adb, a-except.adb,
	a-except.ads, a-excpol.adb, a-exctra.adb, a-exctra.ads,
	a-filico.adb, a-interr.adb, a-intsig.adb, a-intsig.ads,
	ali.adb, ali.ads, ali-util.adb, ali-util.ads,
	a-ngcefu.adb, a-ngcoty.adb, a-ngelfu.adb, a-nudira.adb,
	a-nudira.ads, a-nuflra.adb, a-nuflra.ads, a-reatim.adb,
	a-reatim.ads, a-retide.ads, a-sequio.adb, a-siocst.adb,
	a-siocst.ads, a-ssicst.adb, a-ssicst.ads, a-strbou.adb,
	a-strbou.ads, a-strfix.adb, a-strmap.adb, a-strsea.ads,
	a-strunb.adb, a-strunb.ads, a-ststio.adb, a-stunau.adb,
	a-stunau.ads, a-stwibo.adb, a-stwibo.ads, a-stwifi.adb,
	a-stwima.adb, a-stwiun.adb, a-stwiun.ads, a-tags.adb,
	a-tags.ads, a-tasatt.adb, a-taside.adb, a-teioed.adb,
	a-textio.adb, a-textio.ads, a-tienau.adb, a-tifiio.adb,
	a-tiflau.adb, a-tiflio.adb, a-tigeau.adb, a-tigeau.ads,
	a-tiinau.adb, a-timoau.adb, a-tiocst.adb, a-tiocst.ads,
	atree.adb, atree.ads, a-witeio.adb, a-witeio.ads,
	a-wtcstr.adb, a-wtcstr.ads, a-wtdeio.adb, a-wtedit.adb,
	a-wtenau.adb, a-wtflau.adb, a-wtinau.adb, a-wtmoau.adb,
	bcheck.adb, binde.adb, bindgen.adb, bindusg.adb,
	checks.adb, checks.ads, cio.c, comperr.adb,
	comperr.ads, csets.adb, cstand.adb, cstreams.c,
	debug_a.adb, debug_a.ads, debug.adb, decl.c,
	einfo.adb, einfo.ads, errout.adb, errout.ads,
	eval_fat.adb, eval_fat.ads, exp_aggr.adb, expander.adb,
	expander.ads, exp_attr.adb, exp_ch11.adb, exp_ch13.adb,
	exp_ch2.adb, exp_ch3.adb, exp_ch3.ads, exp_ch4.adb,
	exp_ch5.adb, exp_ch6.adb, exp_ch7.adb, exp_ch7.ads,
	exp_ch8.adb, exp_ch9.adb, exp_code.adb, exp_dbug.adb,
	exp_dbug.ads, exp_disp.adb, exp_dist.adb, expect.c,
	exp_fixd.adb, exp_imgv.adb, exp_intr.adb, exp_pakd.adb,
	exp_prag.adb, exp_strm.adb, exp_strm.ads, exp_tss.adb,
	exp_tss.ads, exp_util.adb, exp_util.ads, exp_vfpt.adb,
	fe.h, fmap.adb, fmap.ads, fname.adb,
	fname.ads, fname-uf.adb, fname-uf.ads, freeze.adb,
	freeze.ads, frontend.adb, g-awk.adb, g-awk.ads,
	g-busora.adb, g-busora.ads, g-busorg.adb, g-busorg.ads,
	g-casuti.adb, g-casuti.ads, g-catiio.adb, g-catiio.ads,
	g-cgi.adb, g-cgi.ads, g-cgicoo.adb, g-cgicoo.ads,
	g-cgideb.adb, g-cgideb.ads, g-comlin.adb, g-comlin.ads,
	g-crc32.adb, g-crc32.ads, g-debpoo.adb, g-debpoo.ads,
	g-debuti.adb, g-debuti.ads, g-diopit.adb, g-diopit.ads,
	g-dirope.adb, g-dirope.ads, g-dyntab.adb, g-dyntab.ads,
	g-except.ads, g-exctra.adb, g-exctra.ads, g-expect.adb,
	g-expect.ads, g-hesora.adb, g-hesora.ads, g-hesorg.adb,
	g-hesorg.ads, g-htable.adb, g-htable.ads, gigi.h,
	g-io.adb, g-io.ads, g-io_aux.adb, g-io_aux.ads,
	g-locfil.adb, g-locfil.ads, g-md5.adb, g-md5.ads,
	gmem.c, gnat1drv.adb, gnatbind.adb, gnatchop.adb,
	gnatcmd.adb, gnatfind.adb, gnatkr.adb, gnatlbr.adb,
	gnatlink.adb, gnatls.adb, gnatmake.adb, gnatmem.adb,
	gnatname.adb, gnatprep.adb, gnatprep.ads, gnatpsta.adb,
	gnatxref.adb, g-os_lib.adb, g-os_lib.ads, g-regexp.adb,
	g-regexp.ads, g-regist.adb, g-regist.ads, g-regpat.adb,
	g-regpat.ads, g-soccon.ads, g-socket.adb, g-socket.ads,
	g-socthi.adb, g-socthi.ads, g-soliop.ads, g-souinf.ads,
	g-speche.adb, g-speche.ads, g-spipat.adb, g-spipat.ads,
	g-spitbo.adb, g-spitbo.ads, g-sptabo.ads, g-sptain.ads,
	g-sptavs.ads, g-table.adb, g-table.ads, g-tasloc.adb,
	g-tasloc.ads, g-thread.adb, g-thread.ads, g-traceb.adb,
	g-traceb.ads, g-trasym.adb, g-trasym.ads, hostparm.ads,
	i-c.ads, i-cobol.adb, i-cpp.adb, i-cstrea.ads,
	i-cstrin.adb, i-cstrin.ads, impunit.adb, init.c,
	inline.adb, interfac.ads, i-pacdec.ads, itypes.adb,
	itypes.ads, i-vxwork.ads, lang.opt, lang-specs.h,
	layout.adb, lib.adb, lib.ads, lib-list.adb,
	lib-load.adb, lib-load.ads, lib-sort.adb, lib-util.adb,
	lib-writ.adb, lib-writ.ads, lib-xref.adb, lib-xref.ads,
	link.c, live.adb, make.adb, make.ads,
	Makefile.adalib, Makefile.in, Make-lang.in, makeusg.adb,
	mdll.adb, mdll-fil.adb, mdll-fil.ads, mdll-utl.adb,
	mdll-utl.ads, memroot.adb, memroot.ads, memtrack.adb,
	misc.c, mkdir.c, mlib.adb, mlib.ads,
	mlib-fil.adb, mlib-fil.ads, mlib-prj.adb, mlib-prj.ads,
	mlib-tgt.adb, mlib-tgt.ads, mlib-utl.adb, mlib-utl.ads,
	namet.adb, namet.ads, namet.h, nlists.ads,
	nlists.h, nmake.adt, opt.adb, opt.ads,
	osint.adb, osint.ads, osint-b.adb, osint-c.adb,
	par.adb, par-ch10.adb, par-ch11.adb, par-ch2.adb,
	par-ch3.adb, par-ch4.adb, par-ch5.adb, par-ch6.adb,
	par-ch9.adb, par-endh.adb, par-labl.adb, par-load.adb,
	par-prag.adb, par-sync.adb, par-tchk.adb, par-util.adb,
	prj.adb, prj.ads, prj-attr.adb, prj-attr.ads,
	prj-com.adb, prj-com.ads, prj-dect.adb, prj-dect.ads,
	prj-env.adb, prj-env.ads, prj-ext.adb, prj-ext.ads,
	prj-makr.adb, prj-makr.ads, prj-nmsc.adb, prj-nmsc.ads,
	prj-pars.adb, prj-pars.ads, prj-part.adb, prj-part.ads,
	prj-pp.adb, prj-pp.ads, prj-proc.adb, prj-proc.ads,
	prj-strt.adb, prj-strt.ads, prj-tree.adb, prj-tree.ads,
	prj-util.adb, prj-util.ads, raise.c, raise.h,
	repinfo.adb, repinfo.h, restrict.adb, restrict.ads,
	rident.ads, rtsfind.adb, rtsfind.ads, s-addima.ads,
	s-arit64.adb, s-assert.adb, s-assert.ads, s-atacco.adb,
	s-atacco.ads, s-auxdec.adb, s-auxdec.ads, s-bitops.adb,
	scans.ads, scn.adb, scn.ads, s-crc32.adb,
	s-crc32.ads, s-direio.adb, sem.adb, sem.ads,
	sem_aggr.adb, sem_attr.adb, sem_attr.ads, sem_case.adb,
	sem_case.ads, sem_cat.adb, sem_cat.ads, sem_ch10.adb,
	sem_ch11.adb, sem_ch12.adb, sem_ch12.ads, sem_ch13.adb,
	sem_ch13.ads, sem_ch3.adb, sem_ch3.ads, sem_ch4.adb,
	sem_ch5.adb, sem_ch5.ads, sem_ch6.adb, sem_ch6.ads,
	sem_ch7.adb, sem_ch7.ads, sem_ch8.adb, sem_ch8.ads,
	sem_ch9.adb, sem_disp.adb, sem_disp.ads, sem_dist.adb,
	sem_elab.adb, sem_eval.adb, sem_eval.ads, sem_intr.adb,
	sem_maps.adb, sem_mech.adb, sem_prag.adb, sem_prag.ads,
	sem_res.adb, sem_res.ads, sem_type.adb, sem_type.ads,
	sem_util.adb, sem_util.ads, sem_warn.adb, s-errrep.adb,
	s-errrep.ads, s-exctab.adb, s-exctab.ads, s-exnint.ads,
	s-exnllf.ads, s-exnlli.ads, s-expint.ads, s-explli.ads,
	s-expuns.ads, s-fatflt.ads, s-fatgen.adb, s-fatgen.ads,
	s-fatlfl.ads, s-fatllf.ads, s-fatsfl.ads, s-fileio.adb,
	s-fileio.ads, s-finimp.adb, s-finimp.ads, s-finroo.adb,
	s-finroo.ads, sfn_scan.adb, s-gloloc.adb, s-gloloc.ads,
	s-imgdec.adb, s-imgenu.adb, s-imgrea.adb, s-imgwch.adb,
	sinfo.adb, sinfo.ads, s-inmaop.ads, sinput.adb,
	sinput.ads, sinput-d.adb, sinput-l.adb, sinput-l.ads,
	sinput-p.adb, sinput-p.ads, s-interr.adb, s-interr.ads,
	s-intman.ads, s-maccod.ads, s-mastop.adb, s-mastop.ads,
	s-memory.adb, s-memory.ads, snames.adb, snames.ads,
	snames.h, s-osprim.ads, s-parame.ads, s-parint.ads,
	s-pooloc.adb, s-pooloc.ads, s-poosiz.adb, sprint.adb,
	s-proinf.ads, s-scaval.ads, s-secsta.adb, s-secsta.ads,
	s-sequio.adb, s-shasto.adb, s-shasto.ads, s-soflin.ads,
	s-stache.adb, s-stache.ads, s-stalib.adb, s-stalib.ads,
	s-stoele.ads, s-stopoo.ads, s-stratt.adb, s-stratt.ads,
	s-strops.adb, s-strops.ads, s-taasde.adb, s-taasde.ads,
	s-tadeca.adb, s-tadeca.ads, s-tadert.adb, s-tadert.ads,
	s-taenca.adb, s-taenca.ads, s-taprob.adb, s-taprob.ads,
	s-taprop.ads, s-tarest.adb, s-tarest.ads, s-tasdeb.adb,
	s-tasdeb.ads, s-tasinf.adb, s-tasinf.ads, s-tasini.adb,
	s-tasini.ads, s-taskin.adb, s-taskin.ads, s-tasque.adb,
	s-tasque.ads, s-tasren.adb, s-tasren.ads, s-tasres.ads,
	s-tassta.adb, s-tassta.ads, s-tasuti.adb, s-tasuti.ads,
	s-tataat.adb, s-tataat.ads, s-tpinop.adb, s-tpinop.ads,
	s-tpoben.adb, s-tpoben.ads, s-tpobop.adb, s-tpobop.ads,
	s-tposen.adb, s-tposen.ads, s-traceb.adb, s-traceb.ads,
	stringt.adb, stringt.ads, stringt.h, style.ads,
	stylesw.adb, stylesw.ads, s-unstyp.ads, s-vaflop.ads,
	s-valrea.adb, s-valuti.adb, s-vercon.adb, s-vmexta.adb,
	s-wchcnv.ads, s-wchcon.ads, s-widcha.adb, switch.adb,
	switch.ads, switch-b.adb, switch-c.adb, switch-m.adb,
	s-wwdcha.adb, s-wwdwch.adb, sysdep.c, system.ads,
	table.adb, table.ads, targparm.adb, targparm.ads,
	targtyps.c, tbuild.adb, tbuild.ads, tracebak.c,
	trans.c, tree_io.adb, treepr.adb, treeprs.adt,
	ttypes.ads, types.ads, types.h, uintp.adb,
	uintp.ads, uintp.h, uname.adb, urealp.adb,
	urealp.ads, urealp.h, usage.adb, utils2.c,
	utils.c, validsw.adb, validsw.ads, widechar.adb,
	xeinfo.adb, xnmake.adb, xref_lib.adb, xref_lib.ads,
	xr_tabls.adb, xr_tabls.ads, xtreeprs.adb, xsnames.adb,
	einfo.h, sinfo.h, treeprs.ads, nmake.ads, nmake.adb,
	gnatvsn.ads: Merge with ACT tree.

	* gnatvsn.adb: Rewritten in a simpler and more efficient way.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@72751 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 525 insertions, 0 deletions

diff --git a/gcc/ada/a-exexpr.adb b/gcc/ada/a-exexpr.adb
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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                     ADA.EXCEPTIONS.EXCEPTION_PROPAGATION                 --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1992-2003 Free Software Foundation, Inc.          --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Interfaces;
+
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
+
+pragma Warnings (Off);
+--  Since several constructs give warnings in 3.14a1, including unreferenced
+--  variables and pragma Unreferenced itself.
+
+separate (Ada.Exceptions)
+package body Exception_Propagation is
+
+   ------------------------------------------------
+   -- Entities to interface with the GCC runtime --
+   ------------------------------------------------
+
+   --  These come from "C++ ABI for Itanium: Exception handling", which is
+   --  the reference for GCC. They are used only when we are relying on
+   --  back-end tables for exception propagation, which in turn is currenly
+   --  only the case for Zero_Cost_Exceptions in GNAT5.
+
+   --  Return codes from the GCC runtime functions used to propagate
+   --  an exception.
+
+   type Unwind_Reason_Code is
+     (URC_NO_REASON,
+      URC_FOREIGN_EXCEPTION_CAUGHT,
+      URC_PHASE2_ERROR,
+      URC_PHASE1_ERROR,
+      URC_NORMAL_STOP,
+      URC_END_OF_STACK,
+      URC_HANDLER_FOUND,
+      URC_INSTALL_CONTEXT,
+      URC_CONTINUE_UNWIND);
+
+   pragma Unreferenced
+     (URC_FOREIGN_EXCEPTION_CAUGHT,
+      URC_PHASE2_ERROR,
+      URC_PHASE1_ERROR,
+      URC_NORMAL_STOP,
+      URC_END_OF_STACK,
+      URC_HANDLER_FOUND,
+      URC_INSTALL_CONTEXT,
+      URC_CONTINUE_UNWIND);
+
+   pragma Convention (C, Unwind_Reason_Code);
+
+   --  Phase identifiers
+
+   type Unwind_Action is
+     (UA_SEARCH_PHASE,
+      UA_CLEANUP_PHASE,
+      UA_HANDLER_FRAME,
+      UA_FORCE_UNWIND);
+
+   for Unwind_Action use
+      (UA_SEARCH_PHASE  => 1,
+       UA_CLEANUP_PHASE => 2,
+       UA_HANDLER_FRAME => 4,
+       UA_FORCE_UNWIND  => 8);
+
+   pragma Convention (C, Unwind_Action);
+
+   --  Mandatory common header for any exception object handled by the
+   --  GCC unwinding runtime.
+
+   subtype Exception_Class is Interfaces.Unsigned_64;
+
+   GNAT_Exception_Class : constant Exception_Class := 16#474e552d41646100#;
+   --  "GNU-Ada\0"
+
+   type Unwind_Exception is record
+      Class    : Exception_Class := GNAT_Exception_Class;
+      Cleanup  : System.Address  := System.Null_Address;
+      Private1 : Integer;
+      Private2 : Integer;
+   end record;
+
+   pragma Convention (C, Unwind_Exception);
+
+   for Unwind_Exception'Alignment use Standard'Maximum_Alignment;
+   --  The C++ ABI mandates the common exception header to be at least
+   --  doubleword aligned, and the libGCC implementation actually makes it
+   --  maximally aligned (see unwind.h). We need to match this because:
+
+   --  1/ We pass pointers to such headers down to the underlying
+   --     libGCC unwinder,
+
+   --  and
+
+   --  2/ The GNAT_GCC_Exception record below starts with this common
+   --     common header and has a C counterpart which needs to be laid
+   --     out identically in raise.c. If the alignment of the C and Ada
+   --     common headers mismatch, their size may also differ, and the
+   --     layouts may not match anymore.
+
+   ---------------------------------------------------------------
+   --  GNAT specific entities to deal with the GCC eh circuitry --
+   ---------------------------------------------------------------
+
+   --  A GNAT exception object to be dealt with by the personality routine
+   --  called by the GCC unwinding runtime. This structure shall match the
+   --  one in raise.c and is currently experimental as it might be merged
+   --  with the GNAT runtime definition some day.
+
+   type GNAT_GCC_Exception is record
+      Header : Unwind_Exception;
+      --  ABI Exception header first.
+
+      Id : Exception_Id;
+      --  GNAT Exception identifier. This is used by the personality
+      --  routine to determine if the context it examines contains a
+      --  handler for the exception beeing propagated.
+
+      Handled_By_Others : Boolean;
+      --  Is this exception handled by "when others" ? This is used by the
+      --  personality routine to determine if an "others" handler in the
+      --  context it examines may catch the exception beeing propagated.
+
+      N_Cleanups_To_Trigger : Integer;
+      --  Number of cleanup only frames encountered in SEARCH phase.
+      --  This is used to control the forced unwinding triggered when
+      --  no handler has been found.
+
+      Next_Exception : EOA;
+      --  Used to create a linked list of exception occurrences.
+   end record;
+
+   pragma Convention (C, GNAT_GCC_Exception);
+
+   type GNAT_GCC_Exception_Access is access all GNAT_GCC_Exception;
+
+   function To_GNAT_GCC_Exception is new
+     Unchecked_Conversion (System.Address, GNAT_GCC_Exception_Access);
+
+   procedure Free is new Unchecked_Deallocation
+     (GNAT_GCC_Exception, GNAT_GCC_Exception_Access);
+
+   procedure Free is new Unchecked_Deallocation
+     (Exception_Occurrence, EOA);
+
+   function Remove
+     (Top   : EOA;
+      Excep : GNAT_GCC_Exception_Access)
+      return  Boolean;
+   --  Remove Excep from the stack starting at Top.
+   --  Return True if Excep was found and removed, false otherwise.
+
+   --  Hooks called when entering/leaving an exception handler for a given
+   --  occurrence, aimed at handling the stack of active occurrences. The
+   --  calls are generated by gigi in tree_transform/N_Exception_Handler.
+
+   procedure Begin_Handler (GCC_Exception : GNAT_GCC_Exception_Access);
+   pragma Export (C, Begin_Handler, "__gnat_begin_handler");
+
+   procedure End_Handler (GCC_Exception : GNAT_GCC_Exception_Access);
+   pragma Export (C, End_Handler, "__gnat_end_handler");
+
+   function CleanupUnwind_Handler
+     (UW_Version   : Integer;
+      UW_Phases    : Unwind_Action;
+      UW_Eclass    : Exception_Class;
+      UW_Exception : access GNAT_GCC_Exception;
+      UW_Context   : System.Address;
+      UW_Argument  : System.Address)
+      return         Unwind_Reason_Code;
+   --  Hook called at each step of the forced unwinding we perform to
+   --  trigger cleanups found during the propagation of an unhandled
+   --  exception.
+
+   --  GCC runtime functions used. These are C non-void functions, actually,
+   --  but we ignore the return values. See raise.c as to why we are using
+   --  __gnat stubs for these.
+
+   procedure Unwind_RaiseException
+     (UW_Exception : access GNAT_GCC_Exception);
+   pragma Import (C, Unwind_RaiseException, "__gnat_Unwind_RaiseException");
+
+   procedure Unwind_ForcedUnwind
+     (UW_Exception : access GNAT_GCC_Exception;
+      UW_Handler   : System.Address;
+      UW_Argument  : System.Address);
+   pragma Import (C, Unwind_ForcedUnwind, "__gnat_Unwind_ForcedUnwind");
+
+   ------------
+   -- Remove --
+   ------------
+
+   function Remove
+     (Top   : EOA;
+      Excep : GNAT_GCC_Exception_Access)
+      return  Boolean
+   is
+      Prev          : GNAT_GCC_Exception_Access := null;
+      Iter          : EOA := Top;
+      GCC_Exception : GNAT_GCC_Exception_Access;
+
+   begin
+      --  Pop stack
+
+      loop
+         pragma Assert (Iter.Private_Data /= System.Null_Address);
+
+         GCC_Exception := To_GNAT_GCC_Exception (Iter.Private_Data);
+
+         if GCC_Exception = Excep then
+            if Prev = null then
+
+               --  Special case for the top of the stack: shift the contents
+               --  of the next item to the top, since top is at a fixed
+               --  location and can't be changed.
+
+               Iter := GCC_Exception.Next_Exception;
+
+               if Iter = null then
+
+                  --  Stack is now empty
+
+                  Top.Private_Data := System.Null_Address;
+
+               else
+                  Save_Occurrence_And_Private (Top.all, Iter.all);
+                  Free (Iter);
+               end if;
+
+            else
+               Prev.Next_Exception := GCC_Exception.Next_Exception;
+               Free (Iter);
+            end if;
+
+            Free (GCC_Exception);
+
+            return True;
+         end if;
+
+         exit when GCC_Exception.Next_Exception = null;
+
+         Prev := GCC_Exception;
+         Iter := GCC_Exception.Next_Exception;
+      end loop;
+
+      return False;
+   end Remove;
+
+   ---------------------------
+   -- CleanupUnwind_Handler --
+   ---------------------------
+
+   function CleanupUnwind_Handler
+     (UW_Version   : Integer;
+      UW_Phases    : Unwind_Action;
+      UW_Eclass    : Exception_Class;
+      UW_Exception : access GNAT_GCC_Exception;
+      UW_Context   : System.Address;
+      UW_Argument  : System.Address)
+      return         Unwind_Reason_Code
+   is
+   begin
+      --  Terminate as soon as we know there is nothing more to run. The
+      --  count is maintained by the personality routine.
+
+      if UW_Exception.N_Cleanups_To_Trigger = 0 then
+         Unhandled_Exception_Terminate;
+      end if;
+
+      --  We know there is at least one cleanup further up. Return so that it
+      --  is searched and entered, after which Unwind_Resume will be called
+      --  and this hook will gain control (with an updated count) again.
+
+      return URC_NO_REASON;
+   end CleanupUnwind_Handler;
+
+   ---------------------
+   -- Setup_Exception --
+   ---------------------
+
+   --  Push the current exception occurrence on the stack before overriding it.
+
+   procedure Setup_Exception
+     (Excep    : EOA;
+      Current  : EOA;
+      Reraised : Boolean := False)
+   is
+      Top           : constant EOA := Current;
+      Next          : EOA;
+      GCC_Exception : GNAT_GCC_Exception_Access;
+
+      --  Note that we make no use of the Reraised indication at this point.
+
+      --  The information is still passed around just in case of future needs,
+      --  since we've already switched between using/not-using it a number of
+      --  times.
+
+   begin
+      --  If the current exception is not live, the stack is empty and there
+      --  is nothing to do. Note that the stack always appears empty for
+      --  mechanisms that do not require one. For the mechanism we implement
+      --  in this unit, the initial Private_Data allocation for an occurrence
+      --  is issued by Propagate_Exception.
+
+      if Top.Private_Data = System.Null_Address then
+         return;
+      end if;
+
+      --  Shift the contents of the Top of the stack in a freshly allocated
+      --  entry, which leaves the room in the fixed Top entry available for the
+      --  occurrence about to be propagated.
+
+      Next := new Exception_Occurrence;
+      Save_Occurrence_And_Private (Next.all, Top.all);
+
+      --  Allocate Private_Data for the occurrence about to be propagated
+      --  and link everything together.
+
+      GCC_Exception := new GNAT_GCC_Exception;
+      GCC_Exception.Next_Exception := Next;
+
+      Top.Private_Data := GCC_Exception.all'Address;
+
+   end Setup_Exception;
+
+   -------------------
+   -- Begin_Handler --
+   -------------------
+
+   procedure Begin_Handler (GCC_Exception : GNAT_GCC_Exception_Access) is
+   begin
+      --  Every necessary operation related to the occurrence stack has
+      --  already been performed by Propagate_Exception. This hook remains for
+      --  potential future necessity in optimizing the overall scheme, as well
+      --  a useful debugging tool.
+      null;
+   end Begin_Handler;
+
+   -----------------
+   -- End_Handler --
+   -----------------
+
+   procedure End_Handler (GCC_Exception : GNAT_GCC_Exception_Access) is
+      Removed : Boolean;
+
+   begin
+      Removed := Remove (Get_Current_Excep.all, GCC_Exception);
+      pragma Assert (Removed);
+   end End_Handler;
+
+   -------------------------
+   -- Propagate_Exception --
+   -------------------------
+
+   --  Build an object suitable for the libgcc processing and call
+   --  Unwind_RaiseException to actually throw, taking care of handling
+   --  the two phase scheme it implements.
+
+   procedure Propagate_Exception (From_Signal_Handler : Boolean) is
+      Excep         : EOA := Get_Current_Excep.all;
+      GCC_Exception : GNAT_GCC_Exception_Access;
+
+   begin
+      if Excep.Private_Data = System.Null_Address then
+         GCC_Exception := new GNAT_GCC_Exception;
+         Excep.Private_Data := GCC_Exception.all'Address;
+      else
+         GCC_Exception := To_GNAT_GCC_Exception (Excep.Private_Data);
+      end if;
+
+      --  Fill in the useful flags for the personality routine called for each
+      --  frame via Unwind_RaiseException below.
+
+      GCC_Exception.Id := Excep.Id;
+      GCC_Exception.Handled_By_Others := not Excep.Id.Not_Handled_By_Others;
+      GCC_Exception.N_Cleanups_To_Trigger := 0;
+
+      --  Compute the backtrace for this occurrence if the corresponding
+      --  binder option has been set. Call_Chain takes care of the reraise
+      --  case.
+
+      --  ??? Using Call_Chain here means we are going to walk up the stack
+      --  once only for backtracing purposes before doing it again for the
+      --  propagation per se.
+
+      --  The first inspection is much lighter, though, as it only requires
+      --  partial unwinding of each frame. Additionally, although we could use
+      --  the personality routine to record the addresses while propagating,
+      --  this method has two drawbacks:
+
+      --  1) the trace is incomplete if the exception is handled since we
+      --  don't walk past the frame with the handler,
+
+      --    and
+
+      --  2) we would miss the frames for which our personality routine is not
+      --  called, e.g. if C or C++ calls are on the way.
+
+      Call_Chain (Excep);
+
+      --  Perform a standard raise first. If a regular handler is found, it
+      --  will be entered after all the intermediate cleanups have run. If
+      --  there is no regular handler, control will get back to after the
+      --  call, with N_Cleanups_To_Trigger set to the number of frames with
+      --  cleanups found on the way up, and none of these already run.
+
+      Unwind_RaiseException (GCC_Exception);
+
+      --  If we get here we know the exception is not handled, as otherwise
+      --  Unwind_RaiseException arranges for the handler to be entered. Take
+      --  the necessary steps to enable the debugger to gain control while the
+      --  stack is still intact.
+
+      Notify_Unhandled_Exception;
+
+      --  Now, if cleanups have been found, run a forced unwind to trigger
+      --  them. Control should not resume there, as the unwinding hook calls
+      --  Unhandled_Exception_Terminate as soon as the last cleanup has been
+      --  triggered.
+
+      if GCC_Exception.N_Cleanups_To_Trigger /= 0 then
+         Unwind_ForcedUnwind (GCC_Exception,
+                              CleanupUnwind_Handler'Address,
+                              System.Null_Address);
+      end if;
+
+      --  We get here when there is no handler or cleanup to be run at
+      --  all. The debugger has been notified before the second step above.
+
+      Unhandled_Exception_Terminate;
+   end Propagate_Exception;
+
+   -----------
+   -- Notes --
+   -----------
+
+   --  The current model implemented for the stack of occurrences is a
+   --  simplification of previous attempts, which all prooved to be flawed or
+   --  would have needed significant additional circuitry to be made to work
+   --  correctly.
+
+   --  We now represent every propagation by a new entry on the stack, which
+   --  means that an exception occurrence may appear more than once (e.g. when
+   --  it is reraised during the course of its own handler).
+
+   --  This may seem overcostly compared to the C++ model as implemented in
+   --  the g++ v3 libstd. This is actually understandable when one considers
+   --  the extra variations of possible run-time configurations induced by the
+   --  freedom offered by the Save_Occurrence/Reraise_Occurrence public
+   --  interface.
+
+   --  The basic point is that arranging for an occurrence to always appear at
+   --  most once on the stack requires a way to determine if a given occurence
+   --  is already there, which is not as easy as it might seem.
+
+   --  An attempt was made to use the Private_Data pointer for this purpose.
+   --  It did not work because:
+
+   --  1/ The Private_Data has to be saved by Save_Occurrence to be usable
+   --     as a key in case of a later reraise,
+
+   --  2/ There is no easy way to synchronize End_Handler for an occurrence
+   --     and the data attached to potential copies, so these copies may end
+   --     up pointing to stale data. Moreover ...
+
+   --  3/ The same address may be reused for different occurrences, which
+   --     defeats the idea of using it as a key.
+
+   --  The example below illustrates:
+
+   --  Saved_CE : Exception_Occurrence;
+   --
+   --  begin
+   --    raise Constraint_Error;
+   --  exception
+   --    when CE: others =>
+   --      Save_Occurrence (Saved_CE, CE);      <= Saved_CE.PDA = CE.PDA
+   --  end;
+   --
+   --                                           <= Saved_CE.PDA is stale (!)
+   --
+   --  begin
+   --    raise Program_Error;                   <= Saved_CE.PDA = PE.PDA (!!)
+   --  exception
+   --    when others =>
+   --      Reraise_Occurrence (Saved_CE);
+   --  end;
+
+   --  Not releasing the Private_Data via End_Handler could be an option,
+   --  but making this to work while still avoiding memory leaks is far
+   --  from trivial.
+
+   --  The current scheme has the advantage of beeing simple, and induces
+   --  extra costs only in reraise cases which is acceptable.
+
+end Exception_Propagation;