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authorChris Dyer <cdyer@cs.cmu.edu>2012-10-11 14:06:32 -0400
committerChris Dyer <cdyer@cs.cmu.edu>2012-10-11 14:06:32 -0400
commit9339c80d465545aec5a6dccfef7c83ca715bf11f (patch)
tree64c56d558331edad1db3832018c80e799551c39a /jam-files/boost-build/util/order.jam
parent438dac41810b7c69fa10203ac5130d20efa2da9f (diff)
parentafd7da3b2338661657ad0c4e9eec681e014d37bf (diff)
Merge branch 'master' of https://github.com/redpony/cdec
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-# Copyright (C) 2003 Vladimir Prus
-# Use, modification, and distribution is subject to the Boost Software
-# License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy
-# at http://www.boost.org/LICENSE_1_0.txt)
-
-# This module defines a class which allows to order arbitrary object with
-# regard to arbitrary binary relation.
-#
-# The primary use case is the gcc toolset, which is sensitive to library order:
-# if library 'a' uses symbols from library 'b', then 'a' must be present before
-# 'b' on the linker's command line.
-#
-# This requirement can be lifted for gcc with GNU ld, but for gcc with Solaris
-# LD (and for Solaris toolset as well), the order always matters.
-#
-# So, we need to store order requirements and then order libraries according to
-# them. It is not possible to use the dependency graph as order requirements.
-# What we need is a "use symbols" relationship while dependency graph provides
-# the "needs to be updated" relationship.
-#
-# For example::
-# lib a : a.cpp b;
-# lib b ;
-#
-# For static linking, library 'a' need not depend on 'b'. However, it should
-# still come before 'b' on the command line.
-
-class order
-{
- rule __init__ ( )
- {
- }
-
- # Adds the constraint that 'first' should preceede 'second'.
- rule add-pair ( first second )
- {
- .constraits += $(first)--$(second) ;
- }
- NATIVE_RULE class@order : add-pair ;
-
- # Given a list of objects, reorder them so that the constraints specified by
- # 'add-pair' are satisfied.
- #
- # The algorithm was adopted from an awk script by Nikita Youshchenko
- # (yoush at cs dot msu dot su)
- rule order ( objects * )
- {
- # The algorithm used is the same is standard transitive closure, except
- # that we're not keeping in-degree for all vertices, but rather removing
- # edges.
- local result ;
- if $(objects)
- {
- local constraints = [ eliminate-unused-constraits $(objects) ] ;
-
- # Find some library that nobody depends upon and add it to the
- # 'result' array.
- local obj ;
- while $(objects)
- {
- local new_objects ;
- while $(objects)
- {
- obj = $(objects[1]) ;
- if [ has-no-dependents $(obj) : $(constraints) ]
- {
- # Emulate break ;
- new_objects += $(objects[2-]) ;
- objects = ;
- }
- else
- {
- new_objects += $(obj) ;
- obj = ;
- objects = $(objects[2-]) ;
- }
- }
-
- if ! $(obj)
- {
- errors.error "Circular order dependencies" ;
- }
- # No problem with placing first.
- result += $(obj) ;
- # Remove all contraints where 'obj' comes first, since they are
- # already satisfied.
- constraints = [ remove-satisfied $(constraints) : $(obj) ] ;
-
- # Add the remaining objects for further processing on the next
- # iteration
- objects = $(new_objects) ;
- }
-
- }
- return $(result) ;
- }
- NATIVE_RULE class@order : order ;
-
- # Eliminate constraints which mention objects not in 'objects'. In
- # graph-theory terms, this is finding a subgraph induced by ordered
- # vertices.
- rule eliminate-unused-constraits ( objects * )
- {
- local result ;
- for local c in $(.constraints)
- {
- local m = [ MATCH (.*)--(.*) : $(c) ] ;
- if $(m[1]) in $(objects) && $(m[2]) in $(objects)
- {
- result += $(c) ;
- }
- }
- return $(result) ;
- }
-
- # Returns true if there's no constraint in 'constaraints' where 'obj' comes
- # second.
- rule has-no-dependents ( obj : constraints * )
- {
- local failed ;
- while $(constraints) && ! $(failed)
- {
- local c = $(constraints[1]) ;
- local m = [ MATCH (.*)--(.*) : $(c) ] ;
- if $(m[2]) = $(obj)
- {
- failed = true ;
- }
- constraints = $(constraints[2-]) ;
- }
- if ! $(failed)
- {
- return true ;
- }
- }
-
- rule remove-satisfied ( constraints * : obj )
- {
- local result ;
- for local c in $(constraints)
- {
- local m = [ MATCH (.*)--(.*) : $(c) ] ;
- if $(m[1]) != $(obj)
- {
- result += $(c) ;
- }
- }
- return $(result) ;
- }
-}
-
-
-rule __test__ ( )
-{
- import "class" : new ;
- import assert ;
-
- c1 = [ new order ] ;
- $(c1).add-pair l1 l2 ;
-
- assert.result l1 l2 : $(c1).order l1 l2 ;
- assert.result l1 l2 : $(c1).order l2 l1 ;
-
- $(c1).add-pair l2 l3 ;
- assert.result l1 l2 : $(c1).order l2 l1 ;
- $(c1).add-pair x l2 ;
- assert.result l1 l2 : $(c1).order l2 l1 ;
- assert.result l1 l2 l3 : $(c1).order l2 l3 l1 ;
-}