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authorandreas_kupries <akupries@shaw.ca>2006-12-05 18:45:50 (GMT)
committerandreas_kupries <akupries@shaw.ca>2006-12-05 18:45:50 (GMT)
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* generic/tclBasic.c: TIP #291. Define tcl_platform element for
* doc/tclvars.n: pointerSize. * win/Makefile.in: Added installation instructions for the platform * win/makefile.vc: package. Added the platform package. * win/makefile.bc: * unix/Makefile.in: * tests/platform.test: * tests/safe.test: * library/platform/platform.tcl: * library/platform/shell.tcl: * library/platform/pkgIndex.tcl:
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+# -*- tcl -*-
+# ### ### ### ######### ######### #########
+## Overview
+
+# Heuristics to assemble a platform identifier from publicly available
+# information. The identifier describes the platform of the currently
+# running tcl shell. This is a mixture of the runtime environment and
+# of build-time properties of the executable itself.
+#
+# Examples:
+# <1> A tcl shell executing on a x86_64 processor, but having a
+# wordsize of 4 was compiled for the x86 environment, i.e. 32
+# bit, and loaded packages have to match that, and not the
+# actual cpu.
+#
+# <2> The hp/solaris 32/64 bit builds of the core cannot be
+# distinguished by looking at tcl_platform. As packages have to
+# match the 32/64 information we have to look in more places. In
+# this case we inspect the executable itself (magic numbers,
+# i.e. fileutil::magic::filetype).
+#
+# The basic information used comes out of the 'os' and 'machine'
+# entries of the 'tcl_platform' array. A number of general and
+# os/machine specific transformation are applied to get a canonical
+# result.
+#
+# General
+# Only the first element of 'os' is used - we don't care whether we
+# are on "Windows NT" or "Windows XP" or whatever.
+#
+# Machine specific
+# % arm* -> arm
+# % sun4* -> sparc
+# % intel -> ix86
+# % i*86* -> ix86
+# % Power* -> powerpc
+# % x86_64 + wordSize 4 => x86 code
+#
+# OS specific
+# % AIX are always powerpc machines
+# % HP-UX 9000/800 etc means parisc
+# % linux has to take glibc version into account
+# % sunos -> solaris, and keep version number
+#
+# NOTE: A platform like linux glibc 2.3, which can use glibc 2.2 stuff
+# has to provide all possible allowed platform identifiers when
+# searching search. Ditto a solaris 2.8 platform can use solaris 2.6
+# packages. Etc. This is handled by the other procedure, see below.
+
+# ### ### ### ######### ######### #########
+## Requirements
+
+namespace eval ::platform {}
+
+# ### ### ### ######### ######### #########
+## Implementation
+
+# -- platform::generic
+#
+# Assembles an identifier for the generic platform. It leaves out
+# details like kernel version, libc version, etc.
+
+proc ::platform::generic {} {
+ global tcl_platform
+
+ set plat [string tolower [lindex $tcl_platform(os) 0]]
+ set cpu $tcl_platform(machine)
+
+ switch -glob -- $cpu {
+ sun4* {
+ set cpu sparc
+ }
+ intel -
+ i*86* {
+ set cpu ix86
+ }
+ x86_64 {
+ if {$tcl_platform(wordSize) == 4} {
+ # See Example <1> at the top of this file.
+ set cpu ix86
+ }
+ }
+ "Power*" {
+ set cpu powerpc
+ }
+ "arm*" {
+ set cpu arm
+ }
+ ia64 {
+ if {$tcl_platform(wordSize) == 4} {
+ append cpu _32
+ }
+ }
+ }
+
+ switch -- $plat {
+ windows {
+ set plat win32
+ if {$cpu eq "amd64"} {
+ # Do not check wordSize, win32-x64 is an IL32P64 platform.
+ set cpu x86_64
+ }
+ }
+ sunos {
+ set plat solaris
+ if {$cpu ne "ia64"} {
+ if {$tcl_platform(wordSize) == 8} {
+ append cpu 64
+ }
+ }
+ }
+ darwin {
+ set plat macosx
+ }
+ aix {
+ set cpu powerpc
+ if {$tcl_platform(wordSize) == 8} {
+ append cpu 64
+ }
+ }
+ hp-ux {
+ set plat hpux
+ if {$cpu ne "ia64"} {
+ set cpu parisc
+ if {$tcl_platform(wordSize) == 8} {
+ append cpu 64
+ }
+ }
+ }
+ osf1 {
+ set plat tru64
+ }
+ }
+
+ return "${plat}-${cpu}"
+}
+
+# -- platform::identify
+#
+# Assembles an identifier for the exact platform, by extending the
+# generic identifier. I.e. it adds in details like kernel version,
+# libc version, etc., if they are relevant for the loading of
+# packages on the platform.
+
+proc ::platform::identify {} {
+ global tcl_platform
+
+ set id [generic]
+ regexp {^([^-]+)-([^-]+)$} $id -> plat cpu
+
+ switch -- $plat {
+ solaris {
+ regsub {^5} $tcl_platform(osVersion) 2 text
+ append plat $text
+ return "${plat}-${cpu}"
+ }
+ linux {
+ # Look for the libc*.so and determine its version
+ # (libc5/6, libc6 further glibc 2.X)
+
+ set v unknown
+
+ if {[file exists /lib64] && [file isdirectory /lib64]} {
+ set base /lib64
+ } else {
+ set base /lib
+ }
+
+ set libclist [lsort [glob -nocomplain -directory $base libc*]]
+ if {[llength $libclist]} {
+ set libc [lindex $libclist 0]
+
+ # Try executing the library first. This should suceed
+ # for a glibc library, and return the version
+ # information.
+
+ if {![catch {
+ set vdata [lindex [split [exec $libc] \n] 0]
+ }]} {
+ regexp {([0-9]+(\.[0-9]+)*)} $vdata -> v
+ foreach {major minor} [split $v .] break
+ set v glibc${major}.${minor}
+ } else {
+ # We had trouble executing the library. We are now
+ # inspecting its name to determine the version
+ # number. This code by Larry McVoy.
+
+ if {[regexp -- {libc-([0-9]+)\.([0-9]+)} $libc -> major minor]} {
+ set v glibc${major}.${minor}
+ }
+ }
+ }
+ append plat -$v
+ return "${plat}-${cpu}"
+ }
+ }
+
+ return $id
+}
+
+# -- platform::patterns
+#
+# Given an exact platform identifier, i.e. _not_ the generic
+# identifier it assembles a list of exact platform identifier
+# describing platform which should be compatible with the
+# input.
+#
+# I.e. packages for all platforms in the result list should be
+# loadable on the specified platform.
+
+# << Should we add the generic identifier to the list as well ? In
+# general it is not compatible I believe. So better not. In many
+# cases the exact identifier is identical to the generic one
+# anyway.
+# >>
+
+proc ::platform::patterns {id} {
+ set res [list $id]
+ if {$id eq "tcl"} {return $res}
+
+ switch -glob -- $id {
+ solaris*-* {
+ if {![regexp {solaris([^-]*)-(.*)} $id -> v cpu]} {return $id}
+ if {$v eq ""} {return $id}
+ foreach {major minor} [split $v .] break
+ incr minor -1
+ for {set j $minor} {$j >= 6} {incr j -1} {
+ lappend res solaris${major}.${j}-${cpu}
+ }
+ }
+ linux*-* {
+ if {![regexp {linux-glibc([^-]*)-(.*)} $id -> v cpu]} {return $id}
+ foreach {major minor} [split $v .] break
+ incr minor -1
+ for {set j $minor} {$j >= 0} {incr j -1} {
+ lappend res linux-glibc${major}.${j}-${cpu}
+ }
+ }
+ macosx-powerpc -
+ macosx-ix86 {
+ lappend res macosx-universal
+ }
+ }
+ lappend res tcl ; # Pure tcl packages are always compatible.
+ return $res
+}
+
+
+# ### ### ### ######### ######### #########
+## Ready
+
+package provide platform 1.0.2
+
+# ### ### ### ######### ######### #########
+## Demo application
+
+if {[info exists argv0] && ($argv0 eq [info script])} {
+ puts ====================================
+ parray tcl_platform
+ puts ====================================
+ puts Generic\ identification:\ [::platform::generic]
+ puts Exact\ identification:\ \ \ [::platform::identify]
+ puts ====================================
+ puts Search\ patterns:
+ puts *\ [join [::platform::patterns [::platform::identify]] \n*\ ]
+ puts ====================================
+ exit 0
+}