diff options
| author | Nicolas Roche <roche@adacore.com> | 2017-09-08 15:12:17 +0000 |
|---|---|---|
| committer | Arnaud Charlet <charlet@gcc.gnu.org> | 2017-09-08 17:12:17 +0200 |
| commit | edcc77dbd9f95301a8be1a2f2b0d774680b46a1a (patch) | |
| tree | 4c2dd8030802ada53aad734af16a8b591a2a2e86 /gcc/ada/libgnat/s-imgrea.adb | |
| parent | 9f00251a8e71aa96e243cb1e95dadbdbad8ada4f (diff) | |
| download | gcc-edcc77dbd9f95301a8be1a2f2b0d774680b46a1a.zip gcc-edcc77dbd9f95301a8be1a2f2b0d774680b46a1a.tar.gz gcc-edcc77dbd9f95301a8be1a2f2b0d774680b46a1a.tar.bz2 | |
Make-lang.in, [...]: Find runtime source in libgnat/
2017-09-08 Nicolas Roche <roche@adacore.com>
* gcc-interface/Make-lang.in, gcc-interface/Makefile.in: Find runtime
source in libgnat/
* a-lfztio.ads, g-timsta.ads, g-sercom-linux.adb, s-osprim-solaris.adb,
a-inteio.ads, s-stchop-rtems.adb, s-casuti.adb, s-pack39.adb,
i-vxwork-x86.ads, a-strbou.adb, a-stzmap.adb, s-assert.adb,
a-sfecin.ads, a-cohama.adb, s-casuti.ads, a-suenco.adb, s-pack39.ads,
a-stzmap.ads, a-strbou.ads, s-stalib.adb, s-trasym.adb, g-comver.adb,
s-assert.ads, s-vector.ads, g-cgi.adb, a-cohama.ads, s-wchcnv.adb,
a-titest.adb, s-pack48.adb, a-suenco.ads, a-strunb.adb, s-stalib.ads,
s-trasym.ads, a-nudira.adb, g-comver.ads, a-nuflra.adb, g-cgi.ads,
a-chacon.adb, s-wchcnv.ads, a-excach.adb, s-pack48.ads, a-titest.ads,
a-strunb.ads, s-dwalin.adb, a-nudira.ads, a-chtgbo.adb, s-resfil.adb,
a-scteio.ads, a-nuflra.ads, g-soliop-mingw.ads, s-pack57.adb,
a-chacon.ads, s-bytswa.ads, s-pooloc.adb, g-os_lib.adb, s-dwalin.ads,
a-szuzha.adb, s-resfil.ads, a-chtgbo.ads, s-spsufi.adb, s-pack57.ads,
s-pooloc.ads, g-os_lib.ads, a-stfiha.ads, a-lcteio.ads, a-wtcoau.adb,
a-szuzha.ads, s-mmosin-unix.adb, a-stmaco.ads, s-spsufi.ads,
s-stchop-limit.ads, a-wtcoau.ads, a-exctra.adb, s-mmosin-unix.ads,
s-sequio.adb, s-conca2.adb, g-table.adb, s-imglli.adb,
a-numaux-x86.adb, a-strsea.adb, s-wchstw.adb, a-clrefi.adb,
a-wwboio.adb, a-exctra.ads, s-sequio.ads, s-conca2.ads, a-wwunio.ads,
system-linux-hppa.ads, g-table.ads, s-dimkio.ads, s-imglli.ads,
a-cofove.adb, a-numaux-x86.ads, s-wchstw.ads, a-strsea.ads,
a-clrefi.ads, a-wwboio.ads, s-stratt-xdr.adb, s-crc32.adb,
s-excmac-arm.adb, g-busora.adb, a-cofove.ads, s-osprim-unix.adb,
g-io.adb, s-pack49.adb, s-crc32.ads, s-excmac-arm.ads, a-fzteio.ads,
g-busora.ads, s-stausa.adb, system-linux-mips.ads, sequenio.ads,
g-exctra.adb, g-rewdat.adb, a-cgaaso.adb, g-io.ads, s-pack49.ads,
a-wtflau.adb, a-undesu.adb, s-stausa.ads, a-ztenau.adb, g-enutst.ads,
calendar.ads, s-pack58.adb, g-rewdat.ads, g-exctra.ads, s-ststop.adb,
a-cgaaso.ads, a-strfix.adb, a-comlin.adb, a-strunb-shared.adb,
a-wtflau.ads, a-undesu.ads, a-cbhase.adb, a-ztenau.ads, s-os_lib.adb,
a-coorse.adb, a-chlat1.ads, s-pack58.ads, s-ststop.ads, a-strfix.ads,
a-comlin.ads, a-strunb-shared.ads, a-nscefu.ads, s-valboo.adb,
directio.ads, a-chtgke.adb, a-cbhase.ads, a-wtinau.adb,
system-linux-alpha.ads, s-os_lib.ads, a-coorse.ads,
system-linux-s390.ads, s-imgwiu.adb, a-chtgop.adb, s-valboo.ads,
a-chtgke.ads, a-tienio.adb, s-conca3.adb, a-wtinau.ads,
system-darwin-ppc.ads, i-c.adb, s-expllu.adb, g-expect.adb,
g-sha256.ads, s-vallld.adb, s-imgwiu.ads, a-chtgop.ads, a-strmap.adb,
a-tienio.ads, s-conca3.ads, s-imgint.adb, i-c.ads, s-expllu.ads,
s-osprim-darwin.adb, a-cogeso.adb, g-expect.ads, a-iwteio.ads,
s-vallld.ads, a-coinho-shared.adb, g-shsh64.adb, a-strmap.ads,
g-comlin.adb, a-excpol.adb, s-imgint.ads, a-ztdeau.adb, a-cogeso.ads,
a-coinho-shared.ads, g-shsh64.ads, g-comlin.ads, a-stzsup.adb,
a-rbtgbk.adb, a-wtmoau.adb, a-ztdeau.ads, s-exnlli.adb, g-tty.adb,
g-heasor.adb, g-socthi-dummy.adb, s-llflex.ads, a-zchara.ads,
a-stzsup.ads, a-ztcstr.adb, a-rbtgbk.ads, a-sfwtio.ads, a-wtmoau.ads,
a-sulcin.adb, s-exnlli.ads, system-freebsd.ads, a-stunha.adb,
a-charac.ads, g-tty.ads, g-heasor.ads, s-exctra.adb,
g-socthi-dummy.ads, a-coboho.adb, a-ztcstr.ads, a-tideio.adb,
a-sulcin.ads, a-wrstfi.adb, g-alleve.adb, s-pack59.adb, a-ngrear.adb,
a-stboha.adb, a-stunau-shared.adb, a-stunha.ads, a-lfwtio.ads,
s-fileio.adb, s-exctra.ads, a-coboho.ads, a-ioexce.ads, a-tideio.ads,
a-ngrear.ads, a-wrstfi.ads, s-pack59.ads, g-alleve.ads, a-stboha.ads,
s-poosiz.adb, g-traceb.adb, g-rannum.adb, machcode.ads, s-purexc.ads,
s-fileio.ads, a-cfinve.adb, a-crbtgk.adb, system-solaris-x86.ads,
s-poosiz.ads, g-rannum.ads, g-traceb.ads, a-except.adb, s-conca4.adb,
a-stream.adb, a-cfinve.ads, a-crbtgk.ads, s-wchwts.adb,
system-mingw.ads, a-except.ads, s-conca4.ads, a-chzla9.ads,
s-valenu.adb, s-soflin.adb, a-stream.ads, a-cgarso.adb, s-valllu.adb,
g-crc32.adb, s-wchwts.ads, s-fatflt.ads, s-imguns.adb, s-strcom.adb,
g-decstr.adb, s-valenu.ads, s-soflin.ads, a-cgarso.ads, a-cwila1.ads,
s-valllu.ads, g-crc32.ads, s-imguns.ads, g-spipat.adb, s-valwch.adb,
s-strcom.ads, g-decstr.ads, text_io.ads, g-debuti.adb, s-stchop.adb,
g-spipat.ads, s-valwch.ads, a-string.ads, s-exnint.adb, g-awk.adb,
g-tasloc.adb, s-wwdenu.adb, s-boustr.adb, a-zchuni.adb, s-stchop.ads,
g-debuti.ads, s-stopoo.adb, system-dragonfly-x86_64.ads,
system-linux-x86.ads, s-exnint.ads, g-awk.ads, a-stzhas.adb,
g-tasloc.ads, s-wwdenu.ads, g-debpoo.adb, g-except.ads,
g-sse.ads, s-boustr.ads, a-zchuni.ads, s-bitops.adb, s-wwdwch.adb,
s-stopoo.ads, a-catizo.adb, a-stzhas.ads, a-nlcefu.ads, g-debpoo.ads,
i-vxwoio.adb, s-bitops.ads, g-io-put-vxworks.adb, s-wwdwch.ads,
g-sehamd.adb, a-ssicst.adb, a-catizo.ads, s-mmap.adb, g-string.adb,
s-traceb.adb, a-swunau.adb, s-rannum.adb, a-ticoau.adb, i-vxwoio.ads,
g-sehamd.ads, a-stwiun.adb, a-ssicst.ads, s-conca5.adb, a-ssitio.ads,
s-mmap.ads, a-zttest.adb, g-string.ads, g-sercom.adb, a-cdlili.adb,
a-swunau.ads, s-traceb.ads, s-rannum.ads, a-ticoau.ads, system-aix.ads,
a-cforma.adb, a-stwiun.ads, s-conca5.ads, s-carsi8.adb, a-zttest.ads,
g-sercom.ads, a-cdlili.ads, a-cihama.adb, g-sptain.ads, a-cforma.ads,
s-maccod.ads, s-carsi8.ads, a-strsup.adb, g-sha1.adb, a-cihama.ads,
g-stseme.adb, s-traent.adb, s-valcha.adb, g-curexc.ads, a-strsup.ads,
g-sha1.ads, a-sflcin.ads, s-traent.ads, s-pack10.adb, s-valcha.ads,
a-coteio.ads, s-tasloc.adb, g-utf_32.adb, a-suteio.adb, s-except.adb,
a-direct.adb, g-stsifd-sockets.adb, a-numaux-vxworks.ads, s-winext.ads,
s-pack10.ads, a-ztexio.adb, a-tiflau.adb, system-vxworks-arm.ads,
s-tasloc.ads, a-suteio.ads, g-utf_32.ads, s-except.ads,
a-direct.ads, a-swbwha.adb, g-hesorg.adb, s-wwdcha.adb, a-wtedit.adb,
a-ztexio.ads, a-wtcoio.adb, a-tiflau.ads, a-ssizti.ads, s-casi32.adb,
a-swbwha.ads, s-veboop.adb, g-hesorg.ads, s-parame-rtems.adb,
s-wwdcha.ads, a-wtedit.ads, a-stuten.adb, a-coinve.adb, a-wtcoio.ads,
s-casi32.ads, s-string.adb, a-tiinau.adb, a-cusyqu.adb, s-conca6.adb,
s-veboop.ads, a-cgcaso.adb, a-numaux-darwin.adb, a-envvar.adb,
a-stuten.ads, s-secsta.adb, a-coinve.ads, s-string.ads, a-cusyqu.ads,
a-tiinau.ads, s-osprim-vxworks.adb, s-conca6.ads, g-spchge.adb,
s-parint.adb, a-cuprqu.adb, a-cgcaso.ads, a-numaux-darwin.ads,
a-envvar.ads, s-secsta.ads, g-spchge.ads, s-parint.ads, a-cuprqu.ads,
a-swuwti.adb, a-flteio.ads, a-sbhcin.adb, a-coprnu.adb, g-u3spch.adb,
s-atocou.adb, g-ctrl_c.adb, a-swuwti.ads, a-calend.adb, a-sbhcin.ads,
a-coprnu.ads, g-dirope.adb, g-sha512.ads, g-u3spch.ads, s-atocou.ads,
g-ctrl_c.ads, a-timoau.adb, a-witeio.adb, s-pack11.adb, a-strhas.adb,
a-wtflio.adb, g-spitbo.adb, a-calend.ads, a-ztenio.adb, g-dirope.ads,
a-slcain.adb, g-sechas.adb, a-timoau.ads, a-witeio.ads, s-pack11.ads,
s-shasto.adb, s-traceb-mastop.adb, a-ciorse.adb, s-utf_32.adb,
a-strhas.ads, a-wtflio.ads, g-spitbo.ads, a-ztenio.ads, a-slcain.ads,
g-sechas.ads, s-gearop.adb, a-siztio.ads, s-pack20.adb, s-shasto.ads,
a-ciorse.ads, s-utf_32.ads, s-crtl.ads, a-wtinio.adb, s-elaall.adb,
s-explli.adb, s-chepoo.ads, s-gearop.ads, a-einuoc.adb, s-pack20.ads,
system-linux-ia64.ads, a-swunau-shared.adb, a-wtinio.ads, g-alvety.ads,
a-liztio.ads, g-calend.adb, s-conca7.adb, s-elaall.ads, s-explli.ads,
a-einuoc.ads, s-widboo.adb, s-imgdec.adb, a-cbhama.adb, g-calend.ads,
s-conca7.ads, a-llitio.ads, i-cexten.ads, a-coorma.adb, s-widboo.ads,
s-diflio.adb, g-souinf.ads, s-imgdec.ads, g-strhas.ads, a-cbhama.ads,
g-shshco.adb, a-ztdeio.adb, s-gloloc.adb, a-coorma.ads, g-wispch.adb,
s-pack03.adb, g-eacodu.adb, s-casi16.adb, s-diflio.ads, a-colien.adb,
g-shshco.ads, a-wtmoio.adb, a-rbtgbo.adb, a-ztdeio.ads,
system-rtems.ads, s-gloloc.ads, a-csquin.ads, a-cofuse.adb,
g-wispch.ads, s-pack03.ads, s-casi16.ads, s-io.adb, a-colien.ads,
g-alveop.adb, gnat.ads, s-diinio.adb, a-cfdlli.adb, g-pehage.adb,
a-wtmoio.ads, a-stwiha.adb, a-locale.adb, a-tirsfi.adb, a-nscoty.ads,
a-rbtgbo.ads, s-pack12.adb, a-cofuse.ads, a-sfteio.ads, s-io.ads,
g-alveop.ads, a-cfdlli.ads, s-diinio.ads, a-stwiha.ads, g-pehage.ads,
a-locale.ads, a-tirsfi.ads, s-pack12.ads, s-valuti.adb, g-cppexc.adb,
system-vxworks-ppc.ads, g-memdum.adb, a-lfteio.ads, s-pack21.adb,
s-unstyp.ads, s-valuti.ads, g-cppexc.ads, system-hpux-ia64.ads,
g-memdum.ads, g-soccon.ads, g-altive.ads, a-crbtgo.adb, s-pack21.ads,
a-llizti.ads, a-numaux-libc-x86.ads, s-expint.adb, s-conca8.adb,
a-crbtgo.ads, s-pack30.adb, s-vallli.adb, s-geveop.adb, s-expint.ads,
a-direio.adb, s-conca8.ads, a-widcha.ads, s-pack30.ads, s-vallli.ads,
s-strhas.adb, s-geveop.ads, g-md5.adb, a-direio.ads, a-numaux.ads,
s-ransee.adb, a-szbzha.adb, i-cobol.adb, g-busorg.adb, s-strhas.ads,
g-md5.ads, s-widenu.adb, s-ransee.ads, s-widllu.adb, a-szbzha.ads,
a-ststio.adb, i-cobol.ads, g-busorg.ads, g-regpat.adb, s-widenu.ads,
a-secain.adb, s-widllu.ads, s-pack13.adb, g-encstr.adb, a-ztcoau.adb,
a-ststio.ads, s-widwch.adb, g-regpat.ads, s-atacco.adb, a-cborse.adb,
a-secain.ads, s-pack13.ads, g-encstr.ads, a-ztcoau.ads, s-widwch.ads,
g-io_aux.adb, s-atacco.ads, a-ncelfu.ads, interfac.ads, a-cborse.ads,
g-regexp.adb, s-pack22.adb, a-szuzti.adb, g-io_aux.ads, s-caun32.adb,
a-nselfu.ads, g-regexp.ads, s-pack22.ads, a-ticoio.adb, a-szuzti.ads,
g-diopit.adb, s-caun32.ads, s-conca9.adb, a-tags.adb, a-swmwco.ads,
a-sbecin.adb, s-pack31.adb, s-expuns.adb, a-ticoio.ads, s-valint.adb,
s-conca9.ads, g-diopit.ads, a-tags.ads, a-nllcef.ads, a-izteio.ads,
a-sbecin.ads, s-expuns.ads, s-pack31.ads, g-dyntab.adb, s-powtab.ads,
s-flocon-none.adb, s-valint.ads, a-ssiwti.ads, s-mmosin-mingw.adb,
s-pack40.adb, s-pack05.adb, a-ztflau.adb, g-dyntab.ads,
a-szuzti-shared.adb, g-alvevi.ads, a-stwise.adb, s-mmosin-mingw.ads,
s-pack40.ads, a-diocst.adb, a-ztflau.ads, s-pack05.ads, a-nlcoty.ads,
a-contai.ads, a-stwisu.adb, g-byorma.adb, a-siwtio.ads, a-stwise.ads,
s-regpat.adb, g-mbdira.adb, s-pack14.adb, a-diocst.ads, g-flocon.ads,
g-mbflra.adb, a-ztinau.adb, s-dim.ads, s-mantis.adb, a-stwisu.ads,
g-byorma.ads, s-atopri.adb, g-wistsp.ads, a-uncdea.ads, s-widcha.adb,
a-caldel.adb, s-regpat.ads, g-mbdira.ads, a-tiflio.adb, s-pack14.ads,
s-parame.adb, a-liwtio.ads, s-memory.adb, g-mbflra.ads, a-ztinau.ads,
a-wtgeau.adb, s-direio.adb, s-mantis.ads, s-atopri.ads, s-widcha.ads,
a-caldel.ads, s-pack23.adb, a-unccon.ads, a-tiflio.ads, s-parame.ads,
a-llftio.ads, s-memory.ads, s-regexp.adb, a-wtgeau.ads, a-exexda.adb,
s-direio.ads, s-pack23.ads, g-stheme.adb, a-tiinio.adb, g-sestin.ads,
s-regexp.ads, a-wtfiio.adb, a-comutr.adb, a-exexpr.adb, a-tiinio.ads,
a-ztmoau.adb, a-cohata.ads, a-wtfiio.ads, s-imgrea.adb, ada.ads,
a-szunau-shared.adb, a-comutr.ads, s-valuns.adb, a-ztmoau.ads,
system-linux-arm.ads, s-osprim-x32.adb, s-pack41.adb, s-pack06.adb,
s-imgrea.ads, s-valuns.ads, s-finroo.adb, s-caun16.adb, s-pooglo.adb,
a-zrstfi.adb, a-suenst.adb, s-pack41.ads, g-binenv.adb, s-pack06.ads,
a-calari.adb, a-nlcoar.ads, s-finroo.ads, a-timoio.adb, s-caun16.ads,
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s-memcop.ads, a-szunau.adb, s-pack24.ads, s-imgllb.adb, s-auxdec.adb,
g-locfil.ads, s-pack33.adb, a-szunau.ads, s-parame-vxworks.adb,
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a-ciorma.ads, system-darwin-x86.ads, s-multip.adb, a-stwiun-shared.adb,
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s-osprim-mingw.adb, s-casi64.adb, g-strspl.ads, g-socthi.ads,
g-socket-dummy.adb, s-pack51.ads, s-dimmks.ads, s-casi64.ads,
a-wtenau.adb, s-stchop-vxworks.adb, s-pack60.adb,
system-solaris-sparc.ads, s-pack25.adb, g-socket-dummy.ads,
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i-vxwork.ads, s-excdeb.ads, system-linux-ppc.ads, a-swuwti-shared.adb,
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From-SVN: r251902
Diffstat (limited to 'gcc/ada/libgnat/s-imgrea.adb')
| -rw-r--r-- | gcc/ada/libgnat/s-imgrea.adb | 699 |
1 files changed, 699 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/s-imgrea.adb b/gcc/ada/libgnat/s-imgrea.adb new file mode 100644 index 0000000..61b32c8 --- /dev/null +++ b/gcc/ada/libgnat/s-imgrea.adb @@ -0,0 +1,699 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . I M G _ R E A L -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2017, 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 3, 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +with System.Img_LLU; use System.Img_LLU; +with System.Img_Uns; use System.Img_Uns; +with System.Powten_Table; use System.Powten_Table; +with System.Unsigned_Types; use System.Unsigned_Types; +with System.Float_Control; + +package body System.Img_Real is + + -- The following defines the maximum number of digits that we can convert + -- accurately. This is limited by the precision of Long_Long_Float, and + -- also by the number of digits we can hold in Long_Long_Unsigned, which + -- is the integer type we use as an intermediate for the result. + + -- We assume that in practice, the limitation will come from the digits + -- value, rather than the integer value. This is true for typical IEEE + -- implementations, and at worst, the only loss is for some precision + -- in very high precision floating-point output. + + -- Note that in the following, the "-2" accounts for the sign and one + -- extra digits, since we need the maximum number of 9's that can be + -- supported, e.g. for the normal 64 bit case, Long_Long_Integer'Width + -- is 21, since the maximum value (approx 1.6 * 10**19) has 20 digits, + -- but the maximum number of 9's that can be supported is 19. + + Maxdigs : constant := + Natural'Min + (Long_Long_Unsigned'Width - 2, Long_Long_Float'Digits); + + Unsdigs : constant := Unsigned'Width - 2; + -- Number of digits that can be converted using type Unsigned + -- See above for the explanation of the -2. + + Maxscaling : constant := 5000; + -- Max decimal scaling required during conversion of floating-point + -- numbers to decimal. This is used to defend against infinite + -- looping in the conversion, as can be caused by erroneous executions. + -- The largest exponent used on any current system is 2**16383, which + -- is approximately 10**4932, and the highest number of decimal digits + -- is about 35 for 128-bit floating-point formats, so 5000 leaves + -- enough room for scaling such values + + function Is_Negative (V : Long_Long_Float) return Boolean; + pragma Import (Intrinsic, Is_Negative); + + -------------------------- + -- Image_Floating_Point -- + -------------------------- + + procedure Image_Floating_Point + (V : Long_Long_Float; + S : in out String; + P : out Natural; + Digs : Natural) + is + pragma Assert (S'First = 1); + + begin + -- Decide whether a blank should be prepended before the call to + -- Set_Image_Real. We generate a blank for positive values, and + -- also for positive zeroes. For negative zeroes, we generate a + -- space only if Signed_Zeroes is True (the RM only permits the + -- output of -0.0 on targets where this is the case). We can of + -- course still see a -0.0 on a target where Signed_Zeroes is + -- False (since this attribute refers to the proper handling of + -- negative zeroes, not to their existence). We do not generate + -- a blank for positive infinity, since we output an explicit +. + + if (not Is_Negative (V) and then V <= Long_Long_Float'Last) + or else (not Long_Long_Float'Signed_Zeros and then V = -0.0) + then + S (1) := ' '; + P := 1; + else + P := 0; + end if; + + Set_Image_Real (V, S, P, 1, Digs - 1, 3); + end Image_Floating_Point; + + -------------------------------- + -- Image_Ordinary_Fixed_Point -- + -------------------------------- + + procedure Image_Ordinary_Fixed_Point + (V : Long_Long_Float; + S : in out String; + P : out Natural; + Aft : Natural) + is + pragma Assert (S'First = 1); + + begin + -- Output space at start if non-negative + + if V >= 0.0 then + S (1) := ' '; + P := 1; + else + P := 0; + end if; + + Set_Image_Real (V, S, P, 1, Aft, 0); + end Image_Ordinary_Fixed_Point; + + -------------------- + -- Set_Image_Real -- + -------------------- + + procedure Set_Image_Real + (V : Long_Long_Float; + S : out String; + P : in out Natural; + Fore : Natural; + Aft : Natural; + Exp : Natural) + is + NFrac : constant Natural := Natural'Max (Aft, 1); + Sign : Character; + X : Long_Long_Float; + Scale : Integer; + Expon : Integer; + + Field_Max : constant := 255; + -- This should be the same value as Ada.[Wide_]Text_IO.Field'Last. + -- It is not worth dragging in Ada.Text_IO to pick up this value, + -- since it really should never be necessary to change it. + + Digs : String (1 .. 2 * Field_Max + 16); + -- Array used to hold digits of converted integer value. This is a + -- large enough buffer to accommodate ludicrous values of Fore and Aft. + + Ndigs : Natural; + -- Number of digits stored in Digs (and also subscript of last digit) + + procedure Adjust_Scale (S : Natural); + -- Adjusts the value in X by multiplying or dividing by a power of + -- ten so that it is in the range 10**(S-1) <= X < 10**S. Includes + -- adding 0.5 to round the result, readjusting if the rounding causes + -- the result to wander out of the range. Scale is adjusted to reflect + -- the power of ten used to divide the result (i.e. one is added to + -- the scale value for each division by 10.0, or one is subtracted + -- for each multiplication by 10.0). + + procedure Convert_Integer; + -- Takes the value in X, outputs integer digits into Digs. On return, + -- Ndigs is set to the number of digits stored. The digits are stored + -- in Digs (1 .. Ndigs), + + procedure Set (C : Character); + -- Sets character C in output buffer + + procedure Set_Blanks_And_Sign (N : Integer); + -- Sets leading blanks and minus sign if needed. N is the number of + -- positions to be filled (a minus sign is output even if N is zero + -- or negative, but for a positive value, if N is non-positive, then + -- the call has no effect). + + procedure Set_Digs (S, E : Natural); + -- Set digits S through E from Digs buffer. No effect if S > E + + procedure Set_Special_Fill (N : Natural); + -- After outputting +Inf, -Inf or NaN, this routine fills out the + -- rest of the field with * characters. The argument is the number + -- of characters output so far (either 3 or 4) + + procedure Set_Zeros (N : Integer); + -- Set N zeros, no effect if N is negative + + pragma Inline (Set); + pragma Inline (Set_Digs); + pragma Inline (Set_Zeros); + + ------------------ + -- Adjust_Scale -- + ------------------ + + procedure Adjust_Scale (S : Natural) is + Lo : Natural; + Hi : Natural; + Mid : Natural; + XP : Long_Long_Float; + + begin + -- Cases where scaling up is required + + if X < Powten (S - 1) then + + -- What we are looking for is a power of ten to multiply X by + -- so that the result lies within the required range. + + loop + XP := X * Powten (Maxpow); + exit when XP >= Powten (S - 1) or else Scale < -Maxscaling; + X := XP; + Scale := Scale - Maxpow; + end loop; + + -- The following exception is only raised in case of erroneous + -- execution, where a number was considered valid but still + -- fails to scale up. One situation where this can happen is + -- when a system which is supposed to be IEEE-compliant, but + -- has been reconfigured to flush denormals to zero. + + if Scale < -Maxscaling then + raise Constraint_Error; + end if; + + -- Here we know that we must multiply by at least 10**1 and that + -- 10**Maxpow takes us too far: binary search to find right one. + + -- Because of roundoff errors, it is possible for the value + -- of XP to be just outside of the interval when Lo >= Hi. In + -- that case we adjust explicitly by a factor of 10. This + -- can only happen with a value that is very close to an + -- exact power of 10. + + Lo := 1; + Hi := Maxpow; + + loop + Mid := (Lo + Hi) / 2; + XP := X * Powten (Mid); + + if XP < Powten (S - 1) then + + if Lo >= Hi then + Mid := Mid + 1; + XP := XP * 10.0; + exit; + + else + Lo := Mid + 1; + end if; + + elsif XP >= Powten (S) then + + if Lo >= Hi then + Mid := Mid - 1; + XP := XP / 10.0; + exit; + + else + Hi := Mid - 1; + end if; + + else + exit; + end if; + end loop; + + X := XP; + Scale := Scale - Mid; + + -- Cases where scaling down is required + + elsif X >= Powten (S) then + + -- What we are looking for is a power of ten to divide X by + -- so that the result lies within the required range. + + loop + XP := X / Powten (Maxpow); + exit when XP < Powten (S) or else Scale > Maxscaling; + X := XP; + Scale := Scale + Maxpow; + end loop; + + -- The following exception is only raised in case of erroneous + -- execution, where a number was considered valid but still + -- fails to scale up. One situation where this can happen is + -- when a system which is supposed to be IEEE-compliant, but + -- has been reconfigured to flush denormals to zero. + + if Scale > Maxscaling then + raise Constraint_Error; + end if; + + -- Here we know that we must divide by at least 10**1 and that + -- 10**Maxpow takes us too far, binary search to find right one. + + Lo := 1; + Hi := Maxpow; + + loop + Mid := (Lo + Hi) / 2; + XP := X / Powten (Mid); + + if XP < Powten (S - 1) then + + if Lo >= Hi then + XP := XP * 10.0; + Mid := Mid - 1; + exit; + + else + Hi := Mid - 1; + end if; + + elsif XP >= Powten (S) then + + if Lo >= Hi then + XP := XP / 10.0; + Mid := Mid + 1; + exit; + + else + Lo := Mid + 1; + end if; + + else + exit; + end if; + end loop; + + X := XP; + Scale := Scale + Mid; + + -- Here we are already scaled right + + else + null; + end if; + + -- Round, readjusting scale if needed. Note that if a readjustment + -- occurs, then it is never necessary to round again, because there + -- is no possibility of such a second rounding causing a change. + + X := X + 0.5; + + if X >= Powten (S) then + X := X / 10.0; + Scale := Scale + 1; + end if; + + end Adjust_Scale; + + --------------------- + -- Convert_Integer -- + --------------------- + + procedure Convert_Integer is + begin + -- Use Unsigned routine if possible, since on many machines it will + -- be significantly more efficient than the Long_Long_Unsigned one. + + if X < Powten (Unsdigs) then + Ndigs := 0; + Set_Image_Unsigned + (Unsigned (Long_Long_Float'Truncation (X)), + Digs, Ndigs); + + -- But if we want more digits than fit in Unsigned, we have to use + -- the Long_Long_Unsigned routine after all. + + else + Ndigs := 0; + Set_Image_Long_Long_Unsigned + (Long_Long_Unsigned (Long_Long_Float'Truncation (X)), + Digs, Ndigs); + end if; + end Convert_Integer; + + --------- + -- Set -- + --------- + + procedure Set (C : Character) is + begin + P := P + 1; + S (P) := C; + end Set; + + ------------------------- + -- Set_Blanks_And_Sign -- + ------------------------- + + procedure Set_Blanks_And_Sign (N : Integer) is + begin + if Sign = '-' then + for J in 1 .. N - 1 loop + Set (' '); + end loop; + + Set ('-'); + + else + for J in 1 .. N loop + Set (' '); + end loop; + end if; + end Set_Blanks_And_Sign; + + -------------- + -- Set_Digs -- + -------------- + + procedure Set_Digs (S, E : Natural) is + begin + for J in S .. E loop + Set (Digs (J)); + end loop; + end Set_Digs; + + ---------------------- + -- Set_Special_Fill -- + ---------------------- + + procedure Set_Special_Fill (N : Natural) is + F : Natural; + + begin + F := Fore + 1 + Aft - N; + + if Exp /= 0 then + F := F + Exp + 1; + end if; + + for J in 1 .. F loop + Set ('*'); + end loop; + end Set_Special_Fill; + + --------------- + -- Set_Zeros -- + --------------- + + procedure Set_Zeros (N : Integer) is + begin + for J in 1 .. N loop + Set ('0'); + end loop; + end Set_Zeros; + + -- Start of processing for Set_Image_Real + + begin + -- We call the floating-point processor reset routine so that we can + -- be sure the floating-point processor is properly set for conversion + -- calls. This is notably need on Windows, where calls to the operating + -- system randomly reset the processor into 64-bit mode. + + System.Float_Control.Reset; + + Scale := 0; + + -- Deal with invalid values first, + + if not V'Valid then + + -- Note that we're taking our chances here, as V might be + -- an invalid bit pattern resulting from erroneous execution + -- (caused by using uninitialized variables for example). + + -- No matter what, we'll at least get reasonable behavior, + -- converting to infinity or some other value, or causing an + -- exception to be raised is fine. + + -- If the following test succeeds, then we definitely have + -- an infinite value, so we print Inf. + + if V > Long_Long_Float'Last then + Set ('+'); + Set ('I'); + Set ('n'); + Set ('f'); + Set_Special_Fill (4); + + -- In all other cases we print NaN + + elsif V < Long_Long_Float'First then + Set ('-'); + Set ('I'); + Set ('n'); + Set ('f'); + Set_Special_Fill (4); + + else + Set ('N'); + Set ('a'); + Set ('N'); + Set_Special_Fill (3); + end if; + + return; + end if; + + -- Positive values + + if V > 0.0 then + X := V; + Sign := '+'; + + -- Negative values + + elsif V < 0.0 then + X := -V; + Sign := '-'; + + -- Zero values + + elsif V = 0.0 then + if Long_Long_Float'Signed_Zeros and then Is_Negative (V) then + Sign := '-'; + else + Sign := '+'; + end if; + + Set_Blanks_And_Sign (Fore - 1); + Set ('0'); + Set ('.'); + Set_Zeros (NFrac); + + if Exp /= 0 then + Set ('E'); + Set ('+'); + Set_Zeros (Natural'Max (1, Exp - 1)); + end if; + + return; + + else + -- It should not be possible for a NaN to end up here. + -- Either the 'Valid test has failed, or we have some form + -- of erroneous execution. Raise Constraint_Error instead of + -- attempting to go ahead printing the value. + + raise Constraint_Error; + end if; + + -- X and Sign are set here, and X is known to be a valid, + -- non-zero floating-point number. + + -- Case of non-zero value with Exp = 0 + + if Exp = 0 then + + -- First step is to multiply by 10 ** Nfrac to get an integer + -- value to be output, an then add 0.5 to round the result. + + declare + NF : Natural := NFrac; + + begin + loop + -- If we are larger than Powten (Maxdigs) now, then + -- we have too many significant digits, and we have + -- not even finished multiplying by NFrac (NF shows + -- the number of unaccounted-for digits). + + if X >= Powten (Maxdigs) then + + -- In this situation, we only to generate a reasonable + -- number of significant digits, and then zeroes after. + -- So first we rescale to get: + + -- 10 ** (Maxdigs - 1) <= X < 10 ** Maxdigs + + -- and then convert the resulting integer + + Adjust_Scale (Maxdigs); + Convert_Integer; + + -- If that caused rescaling, then add zeros to the end + -- of the number to account for this scaling. Also add + -- zeroes to account for the undone multiplications + + for J in 1 .. Scale + NF loop + Ndigs := Ndigs + 1; + Digs (Ndigs) := '0'; + end loop; + + exit; + + -- If multiplication is complete, then convert the resulting + -- integer after rounding (note that X is non-negative) + + elsif NF = 0 then + X := X + 0.5; + Convert_Integer; + exit; + + -- Otherwise we can go ahead with the multiplication. If it + -- can be done in one step, then do it in one step. + + elsif NF < Maxpow then + X := X * Powten (NF); + NF := 0; + + -- If it cannot be done in one step, then do partial scaling + + else + X := X * Powten (Maxpow); + NF := NF - Maxpow; + end if; + end loop; + end; + + -- If number of available digits is less or equal to NFrac, + -- then we need an extra zero before the decimal point. + + if Ndigs <= NFrac then + Set_Blanks_And_Sign (Fore - 1); + Set ('0'); + Set ('.'); + Set_Zeros (NFrac - Ndigs); + Set_Digs (1, Ndigs); + + -- Normal case with some digits before the decimal point + + else + Set_Blanks_And_Sign (Fore - (Ndigs - NFrac)); + Set_Digs (1, Ndigs - NFrac); + Set ('.'); + Set_Digs (Ndigs - NFrac + 1, Ndigs); + end if; + + -- Case of non-zero value with non-zero Exp value + + else + -- If NFrac is less than Maxdigs, then all the fraction digits are + -- significant, so we can scale the resulting integer accordingly. + + if NFrac < Maxdigs then + Adjust_Scale (NFrac + 1); + Convert_Integer; + + -- Otherwise, we get the maximum number of digits available + + else + Adjust_Scale (Maxdigs); + Convert_Integer; + + for J in 1 .. NFrac - Maxdigs + 1 loop + Ndigs := Ndigs + 1; + Digs (Ndigs) := '0'; + Scale := Scale - 1; + end loop; + end if; + + Set_Blanks_And_Sign (Fore - 1); + Set (Digs (1)); + Set ('.'); + Set_Digs (2, Ndigs); + + -- The exponent is the scaling factor adjusted for the digits + -- that we output after the decimal point, since these were + -- included in the scaled digits that we output. + + Expon := Scale + NFrac; + + Set ('E'); + Ndigs := 0; + + if Expon >= 0 then + Set ('+'); + Set_Image_Unsigned (Unsigned (Expon), Digs, Ndigs); + else + Set ('-'); + Set_Image_Unsigned (Unsigned (-Expon), Digs, Ndigs); + end if; + + Set_Zeros (Exp - Ndigs - 1); + Set_Digs (1, Ndigs); + end if; + + end Set_Image_Real; + +end System.Img_Real; |