ldAout.tcl
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- # ldAout.tcl --
- #
- # This "tclldAout" procedure in this script acts as a replacement
- # for the "ld" command when linking an object file that will be
- # loaded dynamically into Tcl or Tk using pseudo-static linking.
- #
- # Parameters:
- # The arguments to the script are the command line options for
- # an "ld" command.
- #
- # Results:
- # The "ld" command is parsed, and the "-o" option determines the
- # module name. ".a" and ".o" options are accumulated.
- # The input archives and object files are examined with the "nm"
- # command to determine whether the modules initialization
- # entry and safe initialization entry are present. A trivial
- # C function that locates the entries is composed, compiled, and
- # its .o file placed before all others in the command; then
- # "ld" is executed to bind the objects together.
- #
- # RCS: @(#) $Id: ldAout.tcl,v 1.5 2001/09/28 01:21:53 dgp Exp $
- #
- # Copyright (c) 1995, by General Electric Company. All rights reserved.
- #
- # See the file "license.terms" for information on usage and redistribution
- # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- #
- # This work was supported in part by the ARPA Manufacturing Automation
- # and Design Engineering (MADE) Initiative through ARPA contract
- # F33615-94-C-4400.
- proc tclLdAout {{cc {}} {shlib_suffix {}} {shlib_cflags none}} {
- global env
- global argv
- if {[string equal $cc ""]} {
- set cc $env(CC)
- }
- # if only two parameters are supplied there is assumed that the
- # only shlib_suffix is missing. This parameter is anyway available
- # as "info sharedlibextension" too, so there is no need to transfer
- # 3 parameters to the function tclLdAout. For compatibility, this
- # function now accepts both 2 and 3 parameters.
- if {[string equal $shlib_suffix ""]} {
- set shlib_cflags $env(SHLIB_CFLAGS)
- } elseif {[string equal $shlib_cflags "none"]} {
- set shlib_cflags $shlib_suffix
- }
- # seenDotO is nonzero if a .o or .a file has been seen
- set seenDotO 0
- # minusO is nonzero if the last command line argument was "-o".
- set minusO 0
- # head has command line arguments up to but not including the first
- # .o or .a file. tail has the rest of the arguments.
- set head {}
- set tail {}
- # nmCommand is the "nm" command that lists global symbols from the
- # object files.
- set nmCommand {|nm -g}
- # entryProtos is the table of _Init and _SafeInit prototypes found in the
- # module.
- set entryProtos {}
- # entryPoints is the table of _Init and _SafeInit entries found in the
- # module.
- set entryPoints {}
- # libraries is the list of -L and -l flags to the linker.
- set libraries {}
- set libdirs {}
- # Process command line arguments
- foreach a $argv {
- if {!$minusO && [regexp {.[ao]$} $a]} {
- set seenDotO 1
- lappend nmCommand $a
- }
- if {$minusO} {
- set outputFile $a
- set minusO 0
- } elseif {![string compare $a -o]} {
- set minusO 1
- }
- if {[regexp {^-[lL]} $a]} {
- lappend libraries $a
- if {[regexp {^-L} $a]} {
- lappend libdirs [string range $a 2 end]
- }
- } elseif {$seenDotO} {
- lappend tail $a
- } else {
- lappend head $a
- }
- }
- lappend libdirs /lib /usr/lib
- # MIPS -- If there are corresponding G0 libraries, replace the
- # ordinary ones with the G0 ones.
- set libs {}
- foreach lib $libraries {
- if {[regexp {^-l} $lib]} {
- set lname [string range $lib 2 end]
- foreach dir $libdirs {
- if {[file exists [file join $dir lib${lname}_G0.a]]} {
- set lname ${lname}_G0
- break
- }
- }
- lappend libs -l$lname
- } else {
- lappend libs $lib
- }
- }
- set libraries $libs
- # Extract the module name from the "-o" option
- if {![info exists outputFile]} {
- error "-o option must be supplied to link a Tcl load module"
- }
- set m [file tail $outputFile]
- if {[regexp {.a$} $outputFile]} {
- set shlib_suffix .a
- } else {
- set shlib_suffix ""
- }
- if {[regexp {..*$} $outputFile match]} {
- set l [expr {[string length $m] - [string length $match]}]
- } else {
- error "Output file does not appear to have a suffix"
- }
- set modName [string tolower $m 0 [expr {$l-1}]]
- if {[regexp {^lib} $modName]} {
- set modName [string range $modName 3 end]
- }
- if {[regexp {[0-9.]*(_g0)?$} $modName match]} {
- set modName [string range $modName 0 [expr {[string length $modName]-[string length $match]-1}]]
- }
- set modName [string totitle $modName]
- # Catalog initialization entry points found in the module
- set f [open $nmCommand r]
- while {[gets $f l] >= 0} {
- if {[regexp {T[ ]*_?([A-Z][a-z0-9_]*_(Safe)?Init(__FP10Tcl_Interp)?)$} $l trash symbol]} {
- if {![regexp {_?([A-Z][a-z0-9_]*_(Safe)?Init)} $symbol trash s]} {
- set s $symbol
- }
- append entryProtos {extern int } $symbol { (); } n
- append entryPoints { } { { "} $s {", } $symbol { } } , n
- }
- }
- close $f
- if {[string equal $entryPoints ""]} {
- error "No entry point found in objects"
- }
- # Compose a C function that resolves the initialization entry points and
- # embeds the required libraries in the object code.
- set C {#include <string.h>}
- append C n
- append C {char TclLoadLibraries_} $modName { [] =} n
- append C { "@LIBS: } $libraries {";} n
- append C $entryProtos
- append C {static struct } { n
- append C { char * name;} n
- append C { int (*value)();} n
- append C } {dictionary [] = } { n
- append C $entryPoints
- append C { 0, 0 } n } ; n
- append C {typedef struct Tcl_Interp Tcl_Interp;} n
- append C {typedef int Tcl_PackageInitProc (Tcl_Interp *);} n
- append C {Tcl_PackageInitProc *} n
- append C TclLoadDictionary_ $modName { (symbol)} n
- append C { CONST char * symbol;} n
- append C {
- {
- int i;
- for (i = 0; dictionary [i] . name != 0; ++i) {
- if (!strcmp (symbol, dictionary [i] . name)) {
- return dictionary [i].value;
- }
- }
- return 0;
- }
- }
- append C n
- # Write the C module and compile it
- set cFile tcl$modName.c
- set f [open $cFile w]
- puts -nonewline $f $C
- close $f
- set ccCommand "$cc -c $shlib_cflags $cFile"
- puts stderr $ccCommand
- eval exec $ccCommand
- # Now compose and execute the ld command that packages the module
- if {[string equal $shlib_suffix ".a"]} {
- set ldCommand "ar cr $outputFile"
- regsub { -o} $tail {} tail
- } else {
- set ldCommand ld
- foreach item $head {
- lappend ldCommand $item
- }
- }
- lappend ldCommand tcl$modName.o
- foreach item $tail {
- lappend ldCommand $item
- }
- puts stderr $ldCommand
- eval exec $ldCommand
- if {[string equal $shlib_suffix ".a"]} {
- exec ranlib $outputFile
- }
- # Clean up working files
- exec /bin/rm $cFile [file rootname $cFile].o
- }