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[perl #129009] [Win32] UV_MAX is wrong on "use 64bit int" builds

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From:
Sisyphus
Date:
August 20, 2016 03:51
Subject:
[perl #129009] [Win32] UV_MAX is wrong on "use 64bit int" builds
Message ID:
rt-4.0.24-21655-1471665085-624.129009-75-0@perl.org
# New Ticket Created by  "Sisyphus" 
# Please include the string:  [perl #129009]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=129009 >


Hi,

I'm assuming that UV_MAX (defined in perl.h) should be set to the maximum 
value that a UV can hold - ie to the value of ~0.

However, on all "use 64bit int" builds that I've tested (from perl-5.12.0 to 
perl-5.25.3) I'm finding that UV_MAX is set to 4294967295, whereas the 
maximum value a UV can hold is 18446744073709551615.

Here is the demo:

###############################

C:\_32\>type try.pl
use warnings;
use strict;

use Inline C => <<'EOC';

void foo() {
#ifdef HAS_QUAD
  printf("has quad defined\n");
#endif

#ifdef USE_64_BIT_INT
  printf("use 64bit int defined\n");
#endif

#ifndef INT64_MAX
  printf("int64_max NOT defined\n");
#endif

  printf("%u %u %u %u\n", UV_MAX, QUADKIND, QUAD_IS_INT64_T, 
PERL_UQUAD_MAX);
}

EOC

foo();

C:\_32>perl try.pl
has quad defined
use 64bit int defined
int64_max NOT defined
4294967295 3 4 4294967295

C:\_32\>perl -le "print ~0;"
18446744073709551615

###############################

What is the best portable way to obtain the maximum UV value from within XS 
?

Here is the 'perl -V' output for the perl (5.25.3)that produced the above 
results:

Summary of my perl5 (revision 5 version 25 subversion 3) configuration:

  Platform:
    osname=MSWin32
    osvers=6.1
    archname=MSWin32-x64-multi-thread
    uname=''
    config_args='undef'
    hint=recommended
    useposix=true
    d_sigaction=undef
    useithreads=define
    usemultiplicity=define
    use64bitint=define
    use64bitall=undef
    uselongdouble=undef
    usemymalloc=n
    bincompat5005=undef
  Compiler:
    cc='gcc'
    ccflags 
' -s -O2 -DWIN32 -DWIN64 -DCONSERVATIVE  -DPERL_TEXTMODE_SCRIPTS -DPERL_IMPLICIT_CONTEXT 
 -DPERL_IMPLICIT_SYS -DUSE_PERLIO -fwrapv -fno-strict-aliasing -mms-bitfields'
    optimize='-s -O2'
    cppflags='-DWIN32'
    ccversion=''
    gccversion='5.3.0'
    gccosandvers=''
    intsize=4
    longsize=4
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=16
    longdblkind=3
    ivtype='long long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='long long'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='g++'
    ldflags 
='-s -L"c:\_64\blead-5.25.3\lib\CORE" -L"C:\_64\gcc-mingw-530\mingw64\lib"'
    libpth=C:\_64\gcc-mingw-530\mingw64\lib 
C:\_64\gcc-mingw-530\mingw64\x86_64-w64-mingw32\lib 
C:\_64\msys_530\1.0\local\lib 
C:\_64\gcc-mingw-530\mingw64\lib\gcc\x86_64-w64-mingw32\5.3.0
    libs= -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 
 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion 
 -lodbc32 -lodbccp32 -lcomctl32
    perllibs= -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 
 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion 
 -lodbc32 -lodbccp32 -lcomctl32
    libc=
    so=dll
    useshrplib=true
    libperl=libperl525.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_win32.xs
    dlext=dll
    d_dlsymun=undef
    ccdlflags=' '
    cccdlflags=' '
    lddlflags='-mdll -s -L"c:\_64\blead-5.25.3\lib\CORE" -L"C:\_64\gcc-mingw-530\mingw64\lib"'


Characteristics of this binary (from libperl):
  Compile-time options:
    HAS_TIMES
    HAVE_INTERP_INTERN
    MULTIPLICITY
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
    PERL_IMPLICIT_CONTEXT
    PERL_IMPLICIT_SYS
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    USE_64_BIT_INT
    USE_ITHREADS
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Built under MSWin32
  Compiled at Jul 21 2016 11:10:53
  @INC:
    C:/_64/blead-5.25.3/site/lib
    C:/_64/blead-5.25.3/lib
    . 


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