2 %%Creator: dvips 5.519 Copyright 1986, 1993 Radical Eye Software
4 %%CreationDate: Sun Nov 14 02:00:43 1993
7 %%BoundingBox: 0 0 612 792
9 %DVIPSCommandLine: dvips -o manonly.ps manonly.dvi
10 %DVIPSSource: TeX output 1993.11.14:0200
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14 mul N /landplus90{false}def /@rigin{isls{[0 landplus90{1 -1}{-1 1}
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19 round 5 exch put setmatrix}N /@landscape{/isls true N}B /@manualfeed{
20 statusdict /manualfeed true put}B /@copies{/#copies X}B /FMat[1 0 0 -1 0
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39 moveto /V matrix currentmatrix dup 1 get dup mul exch 0 get dup mul add
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54 B /c{-4 M}B /d{-3 M}B /e{-2 M}B /f{-1 M}B /g{0 M}B /h{1 M}B /i{2 M}B /j{
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1895 %%Feature: *Resolution 300dpi
1900 0 0 bop 909 506 a Fo(Ox:)519 567 y Fn(An)16 b(A)o(ttribute-Grammar)d
1901 (Compiling)i(System)681 627 y(based)i(on)f(Y)l(acc,)g(Lex,)f(and)i(C:)
1902 549 741 y Fo(User)28 b(Reference)e(Man)n(ual)773 851
1903 y Fm(b)o(y)16 b(Kurt)f(M.)f(Bisc)o(ho\013)784 908 y(No)o(v)o(em)o(b)q
1904 (er)h(14,)f(1993)683 963 y(c)670 964 y Fl(\015)p Fm(1992,)g(1993)g
1905 (Kurt)h(M.)g(Bisc)o(ho\013)p eop
1907 1 1 bop 164 162 a Fk(CONTENTS)1318 b Fn(1)164 315 y Fo(Con)n(ten)n(ts)
1908 164 424 y Fj(1)45 b(Ov)n(erview)18 b(of)g(Use)1115 b(4)164
1909 533 y(2)45 b(Preliminary)1224 b(5)164 642 y(3)45 b(A)n(ttribute)18
1910 b(declarations)973 b(6)237 703 y Fn(3.1)50 b(Seman)o(tics)15
1911 b(of)h(attribute)g(declarations)43 b Fi(:)24 b(:)h(:)f(:)h(:)f(:)h(:)f
1912 (:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)69 b Fn(7)164 811 y Fj(4)45
1913 b(Rules)18 b(and)h(attribute)f(o)r(ccurrences)730 b(7)164
1914 920 y(5)45 b(A)n(ttribute)18 b(de\014nitions)1013 b(8)237
1915 981 y Fn(5.1)50 b(Inherited)15 b(vs.)22 b(syn)o(thesized)14
1916 b(attributes)32 b Fi(:)24 b(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f
1917 (:)h(:)f(:)69 b Fn(8)237 1041 y(5.2)50 b(A)o(ttribute)15
1918 b(reference)g(sections)h(in)g(the)g(Y-\014le)43 b Fi(:)25
1919 b(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)69 b Fn(9)349
1920 1101 y(5.2.1)56 b(Explicit)15 b(mo)q(de)25 b Fi(:)g(:)f(:)h(:)f(:)g(:)h
1921 (:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1922 b Fn(10)349 1161 y(5.2.2)56 b(Implicit)13 b(mo)q(de)26
1923 b Fi(:)f(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)
1924 h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(11)349 1221 y(5.2.3)56
1925 b(Mixed)15 b(mo)q(de)22 b Fi(:)i(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)
1926 h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1927 b Fn(11)237 1282 y(5.3)50 b(A)o(ttribute)15 b(reference)g(sections)h
1928 (in)g(the)g(L-\014le\(s\))32 b Fi(:)24 b(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)
1929 h(:)f(:)44 b Fn(12)349 1342 y(5.3.1)56 b(Generalit)o(y)15
1930 b(of)i(Ox)43 b Fi(:)25 b(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)
1931 f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(12)349 1402 y(5.3.2)56
1932 b(Ox)16 b(adaptation)i(to)f(Lex's)e(line-orien)o(ted)g(syn)o(tax)45
1933 b Fi(:)24 b(:)h(:)f(:)h(:)f(:)44 b Fn(13)349 1462 y(5.3.3)56
1934 b(Resolution)16 b(of)h(am)o(biguit)o(y)d(regarding)j(tok)o(en)f
1935 (returned)35 b Fi(:)25 b(:)f(:)44 b Fn(14)237 1522 y(5.4)50
1936 b(Cycles)36 b Fi(:)24 b(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g
1937 (:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)
1938 44 b Fn(15)164 1631 y Fj(6)h(T)-5 b(ranslation)19 b(in)n(to)f(C)i(co)r
1939 (de)909 b(15)164 1740 y(7)45 b(T)-5 b(emp)r(oral)17 b(b)r(eha)n(vior)h
1940 (of)g(Ox-generated)f(ev)m(aluators)348 b(15)237 1800
1941 y Fn(7.1)50 b(Stac)o(k)16 b(op)q(erations)51 b Fi(:)25
1942 b(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g
1943 (:)h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(15)237 1861 y(7.2)50
1944 b(Placemen)o(t)14 b(of)j(generated)f(co)q(de)23 b Fi(:)h(:)h(:)f(:)h(:)
1945 f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1946 b Fn(16)237 1921 y(7.3)50 b(Decoration)17 b(and)g(the)f(ready)g(set)d
1947 Fi(:)24 b(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f
1948 (:)h(:)f(:)44 b Fn(17)164 2030 y Fj(8)h(Programming)16
1949 b(st)n(yle)1022 b(17)164 2139 y(9)45 b(P)n(ostdecoration)19
1950 b(tra)n(v)n(ersals)872 b(18)237 2199 y Fn(9.1)50 b(Example:)20
1951 b(in\014x)c(to)g(pre\014x)g(translation)31 b Fi(:)24
1952 b(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1953 b Fn(18)237 2259 y(9.2)50 b(General)16 b(description)27
1954 b Fi(:)d(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)
1955 g(:)h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(21)349 2319 y(9.2.1)56
1956 b(T)l(ra)o(v)o(ersal)16 b(sp)q(eci\014cations)24 b Fi(:)h(:)f(:)h(:)f
1957 (:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1958 b Fn(21)349 2380 y(9.2.2)56 b(T)l(ra)o(v)o(ersal)16 b(action)g(sp)q
1959 (eci\014cations)32 b Fi(:)25 b(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f
1960 (:)h(:)f(:)44 b Fn(22)p eop
1962 2 2 bop 164 162 a Fk(CONTENTS)1318 b Fn(2)164 307 y Fj(10)17
1963 b(Ox)h(macros)1227 b(23)237 367 y Fn(10.1)26 b(Macro)17
1964 b(de\014nitions)33 b Fi(:)25 b(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f
1965 (:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1966 b Fn(23)237 428 y(10.2)26 b(Macro)17 b(uses)12 b Fi(:)25
1967 b(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h
1968 (:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(24)237
1969 488 y(10.3)26 b(Example)e Fi(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)
1970 f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h
1971 (:)f(:)44 b Fn(24)164 597 y Fj(11)17 b(Automatic)g(generation)h(of)h
1972 (cop)n(y)f(rules)624 b(25)237 657 y Fn(11.1)26 b(Example)e
1973 Fi(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h
1974 (:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1975 b Fn(27)164 766 y Fj(12)17 b(File-lev)n(el)f(organization)i(of)h(Ox)f
1976 (ev)m(aluators)527 b(29)237 826 y Fn(12.1)26 b(Con)o(v)o(en)o(tions)16
1977 b(of)h(naming)e(Ox)h(output)h(\014les)38 b Fi(:)24 b(:)h(:)f(:)h(:)f(:)
1978 g(:)h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(29)237 886 y(12.2)26
1979 b(Review:)20 b(com)o(bining)15 b(the)h(outputs)h(of)f(Y)l(acc)g(and)h
1980 (Lex)64 b Fi(:)25 b(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(29)237
1981 946 y(12.3)26 b(Com)o(bined)15 b(use)h(of)h(Ox,)e(Y)l(acc,)g(and)i(Lex)
1982 59 b Fi(:)25 b(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1983 b Fn(30)237 1007 y(12.4)26 b(T)o(ypical)15 b(command)g(sequences)30
1984 b Fi(:)24 b(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f
1985 (:)h(:)f(:)44 b Fn(30)164 1116 y Fj(13)17 b(Command-line)f(options)i
1986 (and)h(other)f(p)r(oin)n(ts)511 b(30)237 1176 y Fn(13.1)26
1987 b(Error)17 b(reco)o(v)o(ery)h Fi(:)25 b(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g
1988 (:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)
1989 44 b Fn(31)237 1236 y(13.2)26 b(Memory)15 b(alignmen)o(t)38
1990 b Fi(:)24 b(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f
1991 (:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(31)237 1296 y(13.3)26
1992 b(Stripping)16 b(Ox)g(constructs)47 b Fi(:)25 b(:)f(:)g(:)h(:)f(:)h(:)f
1993 (:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
1994 b Fn(31)237 1356 y(13.4)26 b(Prev)o(en)o(ting)15 b(execution)g(of)i
1995 (attribute)f(de\014nition)g(co)q(de)j Fi(:)24 b(:)h(:)f(:)h(:)f(:)h(:)f
1996 (:)44 b Fn(32)237 1417 y(13.5)26 b(Con)o(trol)17 b(of)f(storage)i(allo)
1997 q(cation)e(in)g(the)g(generated)g(ev)m(aluator)28 b Fi(:)c(:)h(:)f(:)44
1998 b Fn(32)237 1477 y(13.6)26 b(P)o(arse)17 b(tree)e(statistics)25
1999 b Fi(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)
2000 g(:)h(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(33)237 1537 y(13.7)26
2001 b(Adjusting)16 b(the)g(sizes)g(of)h(Ox's)e(data)i(structures)31
2002 b Fi(:)24 b(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
2003 b Fn(34)164 1646 y Fj(14)17 b(Example:)22 b(an)d(in)n(teger)f
2004 (calculator)732 b(34)164 1755 y(15)17 b(Example:)22 b(a)d(binary)f(n)n
2005 (um)n(b)r(er)g(translator)568 b(36)164 1864 y(16)17 b(Example:)22
2006 b(translation)c(to)h(p)r(ost\014x)f(and)h(pre\014x)452
2007 b(40)164 1973 y(A)31 b(Using)19 b(Ox)f(with)h(non-Lex)e(lexical)g
2008 (analyzers)497 b(43)237 2033 y Fn(A.1)37 b(Default)16
2009 b(con)o(text-sensitivit)o(y)e(of)j(L-\014le)f(prepro)q(cessing)49
2010 b Fi(:)25 b(:)f(:)h(:)f(:)h(:)f(:)44 b Fn(43)237 2093
2011 y(A.2)37 b(Ox-prepro)q(cessing)17 b(of)f(C-co)q(ded)i(lexical)c
2012 (analyzers)43 b Fi(:)24 b(:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)44
2013 b Fn(43)349 2153 y(A.2.1)f(Example)22 b Fi(:)i(:)h(:)f(:)h(:)f(:)h(:)f
2014 (:)g(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)h(:)f(:)g(:)h(:)f(:)h(:)f(:)h(:)
2015 f(:)44 b Fn(43)164 2262 y Fj(B)33 b(T)-5 b(ra)n(v)n(ersal)19
2016 b(seman)n(tics)1010 b(47)164 2371 y(C)33 b(List)18 b(of)h(reserv)n(ed)e
2017 (w)n(ords)j(and)f(reserv)n(ed)f(\014le)f(names)355 b(50)p
2020 3 3 bop 164 162 a Fk(CONTENTS)1318 b Fn(3)164 307 y Fj(D)30
2021 b(Summary)16 b(of)j(command-line)c(options)633 b(51)p
2024 4 4 bop 164 162 a Fk(1)49 b(O)o(VER)-5 b(VIEW)15 b(OF)h(USE)1048
2025 b Fn(4)164 315 y Fo(1)83 b(Ov)n(erview)25 b(of)j(Use)164
2026 425 y Fn(Lex)11 b(and)h(Y)l(acc)f(are)g(p)q(o)o(w)o(erful)g(and)h
2027 (widely-used)e(to)q(ols)j(for)e(the)g(automatic)g(generation)164
2028 485 y(of)j(language)h(recognizers.)20 b(Lex)13 b(accepts)h(a)g(set)g
2029 (of)g(user-written)f(regular)h(expressions)164 545 y(and)22
2030 b(writes)g(a)g(C)f(program)h(that)g(p)q(erforms)f(lexical)f(analysis)i
2031 (according)g(to)g(those)164 606 y(expressions.)i(Y)l(acc)17
2032 b(translates)g(user-written)g(grammar)f(rules)h(in)o(to)g(C)g(source)h
2033 (co)q(de)164 666 y(for)13 b(a)g(syn)o(tax)f(analyzer.)20
2034 b(While)12 b(they)g(a\013ord)i(\\ho)q(oks")g(for)f(execution)f(of)h
2035 (hand-co)q(ded)164 726 y(C-language)22 b(seman)o(tic)c(actions,)j(Lex)f
2036 (and)h(Y)l(acc)e(pro)o(vide)h(little)e(other)i(facilit)o(y)f(for)164
2037 786 y(automatic)c(implem)o(en)o(tation)e(of)k(language)g(seman)o(tics.)
2038 237 846 y(A)o(ttributed)e(parse)h(trees)f(are)h(often)g(used)g(as)g
2039 (data)h(structures)f(in)f(ev)m(aluators)i(for)164 907
2040 y(languages.)35 b(Often)20 b(the)h(language)g(implem)o(en)o(te)o(r)d
2041 (hand-crafts)j(co)q(de)g(for)g(building,)164 967 y(tra)o(v)o(ersing,)12
2042 b(and)i(ev)m(aluating)f(attributes)f(of)h(parse)g(trees,)g(and)g(for)g
2043 (parse-tree-related)164 1027 y(memory)j(managemen)o(t.)26
2044 b(A)18 b(Y)l(acc)g(sp)q(eci\014cation)g(de\014nes)h(a)g(con)o
2045 (text-free)e(language)164 1087 y(and)h(a)g(mapping)f(from)f(the)h(set)h
2046 (of)f(legal)g(sen)o(tences)g(to)h(the)f(set)g(of)h(parse)g(trees,)f
2047 (but)164 1147 y(co)q(de)f(for)h(parse-tree)f(managemen)o(t)e(is)i(not)h
2048 (generated)f(automatically)e(b)o(y)i(Y)l(acc.)237 1207
2049 y(The)23 b(Ox)430 1189 y Fh(1)473 1207 y Fn(user)g(can)f(sp)q(ecify)g
2050 (a)i(language)f(using)g(the)g(familiar)e(languages)j(of)164
2051 1268 y(Lex)14 b(and)h(Y)l(acc,)f(or)h(tak)o(e)f(an)h(existing)e(Lex/Y)l
2052 (acc)h(sp)q(eci\014cation,)h(and)g(add)g(seman)o(tics)164
2053 1328 y(to)k(the)e(language)j(b)o(y)d(augmen)o(ting)g(the)h(sp)q
2054 (eci\014cation)g(\014les)g(with)g(declarations)g(and)164
2055 1388 y(de\014nitions)e(of)h(t)o(yp)q(ed)e(attributes)i(of)f(parse-tree)
2056 g(no)q(des.)237 1448 y(That)h(sp)q(eci\014cation)e(constitutes)h(an)g
2057 Fg(attribute)i(gr)n(ammar)5 b Fn(,)15 b(and)h(from)f(it)g(Ox)h(can)164
2058 1508 y(automatically)c(generate)h(an)h Fg(evaluator)20
2059 b Fn(written)13 b(in)g(Y)l(acc,)g(Lex,)g(and)h(C.)f(F)l(or)h(a)g(giv)o
2060 (en)164 1569 y(input,)f(the)g(ev)m(aluator)h(builds)f(a)g(parse)h
2061 (tree,)f(determines)e(an)i(order)h(of)f(ev)m(aluation)h(for)164
2062 1629 y(attributes)j(of)h(the)f(tree,)f(and)i(p)q(erforms,)e(for)h(eac)o
2063 (h)g(attribute,)g(the)g(seman)o(tic)e(action)164 1689
2064 y(required)c(to)i(ev)m(aluate)e(it.)20 b(This)12 b(parse)h(tree)e(is)h
2065 (managed)g(indep)q(enden)o(tly)f(of)h(an)o(y)g(trees)164
2066 1749 y(managed)18 b(b)o(y)g(hand-written)h(C)g(co)q(de,)g(but)g
2067 (information)f(ma)o(y)f(b)q(e)h(mo)o(v)o(ed)f(b)q(et)o(w)o(een)164
2068 1809 y(the)f(ev)m(aluator-managed)h(tree)e(and)i(an)o(y)f(global)h
2069 (data)g(structure.)237 1870 y(Additionally)l(,)c(the)i(Ox)g(user)g(can)
2070 g(easily)f(sp)q(ecify)g(parse-tree)h(tra)o(v)o(ersals)f(that)i(are)164
2071 1930 y(p)q(erformed)k(after)i(ev)m(aluation)f(of)h(the)f(tree's)g
2072 (attributes)g(and)h(that)g(refer)f(to)h(those)164 1990
2073 y(attributes.)38 b(Suc)o(h)21 b(tra)o(v)o(ersals)h(greatly)f(simplify)e
2074 (tasks)k(suc)o(h)e(as)i(co)q(de)f(generation)164 2050
2075 y(and)17 b(the)f(gathering)h(of)f(compilation)f(statistics.)237
2076 2110 y(The)k(language)h(designer)f(is)g(freed)f(from)g(the)g(tedious)h
2077 (and)h(error-prone)f(details)164 2171 y(of)24 b(writing)g(co)q(de)g
2078 (for)g(parse-tree)g(managemen)o(t.)42 b(Ox-generated)23
2079 b(ev)m(aluators)i(use)164 2231 y(memory-m)o(anageme)o(n)o(t)16
2080 b(tec)o(hniques)i(that)h(bring)g(large)g(time-e\016cienc)o(y)d(gains)k
2081 (o)o(v)o(er)p 164 2274 648 2 v 220 2305 a Ff(1)239 2320
2082 y Fe(The)13 b(name)f(\\Ox")h(originated)g(as)g(a)g(homophone)e(for)i
2083 (an)g(acron)o(ym)f(for)h(\\An)g(A)o(ttribute)h(Gram-)164
2084 2370 y(mar)f(Compiling)d(System".)18 b(It)c(w)o(as)g(noticed)h(later)f
2085 (that)g(ev)o(ery)h(y)o(ak)f(is)f(an)h(o)o(x)g(and)g(that)g(Ox)g(gener-)
2086 164 2420 y(alizes)g(the)g(function)g(of)f(Y)m(acc.)p
2089 5 5 bop 164 162 a Fk(2)49 b(PRELIMINAR)l(Y)1166 b Fn(5)164
2090 307 y(hand-built)15 b(ev)m(aluators)g(that)h(use)e(the)h(common)d(tec)o
2091 (hnique)h(of)j(calling)d Fd(malloc)g Fn(once)164 367
2092 y(for)i(eac)o(h)f(parse-tree)g(no)q(de.)21 b(Also,)15
2093 b(Ox)f(pro)o(vides)g(securit)o(y)f(b)o(y)h(testing)g(the)g
2094 (de\014nition)164 428 y(for)j(consistency)f(and)i(completeness,)c(and)k
2095 (the)f(Ox-generated)f(ev)m(aluator)i(p)q(erforms)164
2096 488 y(tests)24 b(to)g(ensure)g(that)g(a)g(circular)f(de\014nition)g
2097 (has)h(not)h(prev)o(en)o(ted)d(ev)m(aluation)i(of)164
2098 548 y(attributes.)237 608 y(Ox)17 b(is)f(a)i(prepro)q(cessor)f(that)g
2099 (accepts)g(t)o(w)o(o)g(or)g(more)e(\014les,)h(and)i(translates)f(these)
2100 164 668 y(in)o(to)e(\014les)g(suitable)g(for)h(input)f(to)h(Lex)895
2101 650 y Fh(2)930 668 y Fn(and)g(Y)l(acc.)k(With)15 b(few)h(exceptions,)e
2102 (all)h(Lex-)164 729 y(input/Y)l(acc-input)i(pairs)g(of)h(\014les)f
2103 (that)g(constitute)g(recognizers)g(or)g(translators)i(are)164
2104 789 y(legal)14 b(inputs)h(to)g(Ox.)20 b(Th)o(us)15 b(m)o(uc)o(h)d
2105 (existing)i(soft)o(w)o(are)g(is)h(amenable)e(to)i(mo)q(di\014cation)164
2106 849 y(using)21 b(Ox,)f(and)h(implem)o(en)o(tations)d(that)i(use)h(Ox)f
2107 (can)g(b)q(e)h(con)o(v)o(erted)e(step)o(wise)g(b)o(y)164
2108 909 y(hand)i(to)g(\\pure")h(Lex/Y)l(acc)e(implem)o(en)n(tations.)32
2109 b(This)21 b(mak)o(es)e(Ox)h(w)o(ell-suited)g(to)164 969
2110 y(language)g(designers,)g(exp)q(erimen)o(ters,)d(and)j(implem)o(en)o
2111 (ter)o(s)d(already)j(familiar)d(with)164 1029 y(Lex,)f(Y)l(acc,)f(and)i
2112 (C.)164 1196 y Fo(2)83 b(Preliminary)164 1305 y Fn(It)17
2113 b(is)h(assumed)g(that)g(the)g(reader)f(is)h(familiar)e(with)i(the)f
2114 (use)h(of)h(Y)l(acc)e([Johnson)g(75)q(],)164 1366 y(Lex)f([Lesk)g(75)q
2115 (],)g(and)h(C)f([KR)g(88)q(];)f(Ox)h(syn)o(tactic)g(constructs)h(are)f
2116 (describ)q(ed)g(mainly)164 1426 y(as)g(augmen)o(tations)f(of)g(the)g
2117 (languages)i(accepted)d(b)o(y)h(those)h(to)q(ols.)1437
2118 1408 y Fh(3)1478 1426 y Fn(Prior)g(acquain-)164 1486
2119 y(tance)i(with)g(the)g(basic)h(ideas)f(of)h(attribute)f(grammars)f
2120 (\(for)h(instance,)g(as)h(found)g(in)164 1546 y([W)l(aite)c(84)q(])h
2121 (or)h([Aho)e(86)q(]\))h(is)g(helpful.)237 1606 y(An)h(Ox)f(input)g(sp)q
2122 (eci\014cation)h(consists)g(of)g(at)g(least)g(t)o(w)o(o)f(\014les:)22
2123 b(a)17 b(syn)o(tactic)f(sp)q(ec-)164 1667 y(i\014cation)j(\(whic)o(h)f
2124 (resem)o(bles)f(a)i(Y)l(acc)g(input)g(sp)q(eci\014cation)g(and)g(is)g
2125 (called)f(a)i Fg(Y-\014le)p Fn(\))164 1727 y(that)f(Ox)g(translates)g
2126 (in)o(to)g(a)g(Y)l(acc)g(input)f(sp)q(eci\014cation,)h(and)h(one)f(or)g
2127 (more)f(lexical)164 1787 y(sp)q(eci\014cations)c(\(whic)o(h)f(resem)o
2128 (ble)e(Lex)j(input)g(sp)q(eci\014cations)g(and)h(are)f(called)e
2129 Fg(L-\014le)p Fn(s\))164 1847 y(that)j(Ox)f(translates)h(in)o(to)e(Lex)
2130 i(input)f(sp)q(eci\014cations.)20 b(Usually)14 b(there)g(is)g(exactly)f
2131 (one)164 1907 y(L-\014le,)21 b(but)f(an)g(ev)m(aluator)h(that)f(uses)g
2132 (more)f(than)i(one)f(lexical)e(analyzer)i([Lesk)c(75])164
2133 1967 y(ma)o(y)i(b)q(e)h(constructed)g(b)o(y)f(submitting)g(to)i(Ox)e
2134 (more)g(than)i(one)f(L-\014le.)30 b(This)20 b(man-)164
2135 2028 y(ual)h(presen)o(ts)f(descriptions)g(of)h(the)g(Ox-sp)q(eci\014c)e
2136 (constructs)i(that)h(ma)o(y)d(app)q(ear)i(in)164 2088
2137 y(these)f(\014les,)h(as)g(w)o(ell)f(as)h(p)q(ertinen)o(t)e(underlying)h
2138 (concepts.)34 b(These)21 b(constructs)g(are)164 2148
2139 y(illustrated)15 b(mainly)f(b)o(y)i(using)h(fragmen)o(ts)e(of)i(three)e
2140 (examples)f(of)j(Ox)f(input)g(sp)q(eci\014-)p 164 2192
2141 648 2 v 220 2222 a Ff(2)239 2237 y Fe(The)11 b(general)f(descriptions)i
2142 (in)e(this)h(man)o(ual)d(assume)i(the)h(use)g(of)f(a)g(Lex-based)i
2143 (lexical)d(analyzer.)164 2287 y(It)i(is)f(p)q(ossible,)h(ho)o(w)o(ev)o
2144 (er,)g(to)f(use)i(Ox)e(with)h(lexical)e(analyzers)i(hand-written)g(in)f
2145 (C:)g(details)g(are)h(giv)o(en)164 2337 y(separately)j(\(in)g(app)q
2146 (endix)g(A\).)220 2372 y Ff(3)239 2387 y Fe(\\Y)m(acc",)e(\\Lex",)g
2147 (and)g(\\C")g(can,)h(in)f(this)h(man)o(ual,)d(b)q(e)j(tak)o(en)g(to)f
2148 (mean)f(\\Y)m(acc)i(or)g(Bison",)f(\\Lex)164 2437 y(or)i(Flex",)f(and)h
2149 (\\C)f(or)h(C++",)g(resp)q(ectiv)o(ely)m(.)p eop
2151 6 6 bop 164 162 a Fk(3)49 b(A)l(TTRIBUTE)15 b(DECLARA)l(TIONS)814
2152 b Fn(6)164 307 y(cations,)16 b(the)g(complete)e(texts)i(of)g(whic)o(h)g
2153 (app)q(ear)h(in)f(sections)g(14,)h(15,)f(and)h(16.)237
2154 367 y(Within)24 b(Ox-sp)q(eci\014c)g(constructs,)j(C-st)o(yle)d(and)i
2155 (C++-st)o(yle)e(commen)n(ts)e(ma)o(y)164 428 y(app)q(ear)27
2156 b(an)o(ywhere)e(whitespace)g(ma)o(y)g(app)q(ear.)51 b(The)25
2157 b(global)h(iden)o(ti\014ers)f(of)h(Ox-)164 488 y(generated)c(C)h(co)q
2158 (de,)g(lik)o(e)e(those)h(generated)g(b)o(y)g(Y)l(acc)g(and)g(Lex,)i
2159 (are)e(pre\014xed)f(b)o(y)164 548 y Fd(yy)p Fn(,)e(so)i(the)e(Ox)g
2160 (user)h(can)g(a)o(v)o(oid)f(name)g(con\015icts)g(in)g(the)h(generated)f
2161 (ev)m(aluator)h(b)o(y)164 608 y(abstaining)d(from)e(the)h(use)g(of)h
2162 (global)g(iden)o(ti\014ers)d(that)j(b)q(egin)g(with)f
2163 Fd(yy)p Fn(.)164 775 y Fo(3)83 b(A)n(ttribute)27 b(declarations)164
2164 884 y Fn(As)17 b(describ)q(ed)f(in)h([Johnson)g(75)q(],)g(the)g
2165 (declarations)g(section)f(of)i(a)f(Y)l(acc)g(input)g(sp)q(ec-)164
2166 944 y(i\014cation)g(is)h(the)g(part)g(that)g(precedes)f(the)g(\014rst)i
2167 Fd(\045\045)e Fn(mark,)f(and)i(in)g(it)f(the)h(user)f(ma)o(y)164
2168 1004 y(declare)c(the)h(start)g(sym)o(b)q(ol,)f(tok)o(ens,)h(asso)q
2169 (ciativities,)f(unions,)i(C)f(co)q(de)g(sections,)g(etc.)164
2170 1065 y(The)h(Y-\014le)f(con)o(tains)h(suc)o(h)f(a)i(declarations)f
2171 (section,)f(and)h(in)g(it)f(are)h(p)q(ermitted)e(all)i(of)164
2172 1125 y(the)g(constructs)g(of)g(Y)l(acc)g(declarations)g(sections,)f(as)
2173 i(w)o(ell)d(as)j(Ox)30 b Fg(attribute)17 b(de)n(clar)n(a-)164
2174 1185 y(tions)t Fn(.)29 b(An)18 b(attribute)h(declaration)f(consists)h
2175 (of)g(the)g(reserv)o(ed)e(w)o(ord)i Fd(@attribute)o(s)164
2176 1245 y Fn(follo)o(w)o(ed)13 b(b)o(y)g Fc(f)p Fn(,)h(an)g(attribute)f
2177 (declaration)g(list,)g Fc(g)p Fn(,)h(and)g(a)g(list)f(of)h(grammar)e
2178 (sym)o(b)q(ols.)237 1305 y(Supp)q(ose)23 b(that)g(a)f(grammar)f(has)i
2179 (a)f(sym)o(b)q(ol)f Fd(bitlist)f Fn(and)j(the)e(follo)o(wing)h(at-)164
2180 1366 y(tribute)16 b(declaration:)292 1467 y Fd(@attribute)o(s)23
2181 b({float)g(value;)h(int)g(scale,leng)o(th;)o(})f(bitlist)164
2182 1569 y Fn(Then)c(the)g(Ox-generated)h(ev)m(aluator,)g(when)f(building)g
2183 (a)g(parse-tree)h(no)q(de)g(lab)q(eled)164 1629 y Fd(bitlist)p
2184 Fn(,)10 b(allo)q(cates)i(storage)h(for)f(a)g(\015oat)h(named)e
2185 Fd(value)f Fn(and)j(in)o(tegers)e(named)g Fd(scale)164
2186 1689 y Fn(and)17 b Fd(length)p Fn(.)237 1750 y(An)g(attribute)f
2187 (declaration)h(list)f(\(in)g(the)h(previous)g(example,)d(the)j(part)g
2188 (b)q(et)o(w)o(een)164 1810 y(curly)23 b(braces\))h(resem)o(bles)e(a)i
2189 (C)h(structure)f(declaration)g(list.)44 b(Digit)24 b(strings)g(and)164
2190 1870 y(C-st)o(yle)d(iden)o(ti\014ers,)g(as)h(w)o(ell)e(as)i(the)f
2191 (follo)o(wing)g(c)o(haracters)h(and)g(reserv)o(ed)e(w)o(ords,)164
2192 1930 y(arranged)d(according)g(to)f(C)h(syn)o(tax,)e(are)i(legal)f(in)f
2193 (attribute)h(declaration)g(lists:)369 2032 y Fd(*)25
2194 b(:)h(;)f(,)g(char)f(short)g(int)h(long)f(float)g(double)472
2195 2092 y(signed)f(unsigned)g(struct)g(union)h(enum)164
2196 2194 y Fn(Note)15 b(that)i(curly)e(braces)h(ma)o(y)e(not)i(app)q(ear)h
2197 (inside)e(\(and)i(so)f(structures)g(and)g(unions)164
2198 2254 y(ma)o(y)21 b(not)h(b)q(e)g(declared)g(inside\))f(attribute)h
2199 (declaration)g(lists.)38 b(Despite)22 b(this,)h(an)o(y)164
2200 2314 y(fundamen)o(tal)12 b(or)h(deriv)o(ed)f(t)o(yp)q(e)g(p)q(ermitted)
2201 f(in)i(a)h(C)f(program)g(ma)o(y)e(b)q(e)j(used)f(as)h(an)f(at-)164
2202 2374 y(tribute)f(t)o(yp)q(e)h(sp)q(eci\014er:)19 b(Y)l(acc)12
2203 b(input)h(sp)q(eci\014cations)g(often)h(con)o(tain)e(C)i(co)q(de)f
2204 (sections)164 2434 y(b)q(et)o(w)o(een)i Fd(\045)p Fc(f)h
2205 Fn(and)h Fd(\045)p Fc(g)p Fn(,)f(and)h(these)f(are)h(also)g(p)q
2206 (ermitted)d(in)i(Ox)g(input)g(sp)q(eci\014cations.)p
2209 7 7 bop 164 162 a Fk(4)49 b(R)o(ULES)16 b(AND)g(A)l(TTRIBUTE)f
2210 (OCCURRENCES)523 b Fn(7)164 307 y(An)o(y)12 b(t)o(yp)q(e)h(name)f(giv)o
2211 (en)g(meaning)g(b)o(y)g(using)i Fd(struct)p Fn(,)d Fd(union)p
2212 Fn(,)g Fd(typedef)p Fn(,)g(or)i Fd(#define)164 367 y
2213 Fn(in)j(a)h(previous)f(C)g(co)q(de)g(section)g(ma)o(y)f(b)q(e)h(used)h
2214 (as)g(an)f(attribute)g(t)o(yp)q(e)g(sp)q(eci\014er.)237
2215 428 y(The)h(list)e(of)i(grammar)e(sym)o(b)q(ols)g(follo)o(wing)i
2216 Fc(g)f Fn(is)g(a)h(p)q(ossibly)g(empt)o(y)d(list)i(of)h(Y)l(acc)164
2217 488 y(tok)o(ens)c(\(including)g(c)o(haracter)g(constan)o(ts\))i(and)f
2218 (non)o(terminals,)e(mem)o(b)q(ers)f(of)j(the)g(list)164
2219 548 y(b)q(eing)i(separated)h(b)o(y)f(whitespace.)237
2220 608 y(All)10 b(uses)h(of)g(the)f(Y)l(acc)h(reserv)o(ed)e(w)o(ords)i
2221 Fd(\045token)p Fn(,)f Fd(\045left)p Fn(,)f Fd(\045right)p
2222 Fn(,)h(and)h Fd(\045nonassoc)164 668 y Fn(m)o(ust)k(precede)g(all)h(of)
2223 g(the)g(attribute)g(declarations.)164 813 y Fb(3.1)70
2224 b(Seman)n(tics)21 b(of)i(attribute)f(declarations)164
2225 905 y Fn(An)15 b(attribute)g(declaration)h(informs)e(Ox)h(that)h(eac)o
2226 (h)f(sym)o(b)q(ol)g(in)g(the)g(grammar)f(sym-)164 965
2227 y(b)q(ol)23 b(list)e(has)i(attributes)g(of)f(the)g(names)g(and)h(t)o
2228 (yp)q(es)f(app)q(earing)h(in)f(the)g(attribute)164 1025
2229 y(declaration)17 b(list.)24 b(If)17 b Fi(a)g Fn(app)q(ears)i(in)e(the)g
2230 (attribute)g(declaration)g(list)g(and)h Fi(s)g Fn(app)q(ears)164
2231 1086 y(in)13 b(the)g(grammar)f(sym)o(b)q(ol)g(list,)h(then)g
2232 Fi(a)h Fn(is)f(said)h(to)f Fg(b)n(elong)20 b Fn(to)14
2233 b Fi(s)f Fn(or)h(to)g(b)q(e)f(an)h(attribute)164 1146
2234 y(of)20 b Fi(s)p Fn(.)32 b(Eac)o(h)20 b(grammar)e(sym)o(b)q(ol)g(has)j
2235 (its)e(o)o(wn)h(attribute)g(name)e(space.)32 b(When)20
2236 b(the)164 1206 y(ev)m(aluator)i(creates)e(a)i(no)q(de)f(lab)q(eled)g(b)
2237 o(y)g(one)g(of)g(the)g(listed)f(sym)o(b)q(ols,)h(it)g(allo)q(cates)164
2238 1266 y(storage)i(of)e(the)h(sp)q(eci\014ed)f(t)o(yp)q(e)g(for)h(eac)o
2239 (h)f(of)h(the)f(named)g(attributes.)37 b(A)21 b(storage)164
2240 1326 y(lo)q(cation)e(so)g(allo)q(cated)g(is)f(called)g(an)h
2241 Fg(attribute)h(instanc)n(e)k Fn(\(concisely)l(,)17 b(an)i
2242 Fg(instanc)n(e)t Fn(\))164 1387 y(in)d(the)g(parse)h(tree.)j(Instances)
2243 c(ma)o(y)f(b)q(e)h(said)h(to)f Fg(b)n(elong)23 b Fn(to)16
2244 b(no)q(des.)164 1553 y Fo(4)83 b(Rules)26 b(and)h(attribute)h(o)r
2245 (ccurrences)164 1663 y Fn(Y)l(acc)16 b(grammar)e(rules)i(\(pro)q
2246 (ductions\),)h(and)g(the)f(ob)s(jects)g(of)g Fd(return)e
2247 Fn(statemen)o(ts)h(in)164 1723 y(Lex)g(actions)g(\(eac)o(h)f(suc)o(h)g
2248 (ob)s(ject)h(b)q(eing)g(a)g(tok)o(en\),)f(are)h(here)f(referred)g(to)h
2249 (generically)164 1783 y(as)i Fg(rules)t Fn(.)k(Since)15
2250 b(Ox)h(accepts)g(the)g(constructs)g(of)g(Y)l(acc)g(and)g(Lex,)g(and)g
2251 (passes)h(these)164 1843 y(unc)o(hanged,)g(the)g(corresp)q(onding)h
2252 (constructs)f(of)g(Ox)g(input)f(sp)q(eci\014cations)h(are)g(also)164
2253 1903 y(called)k Fg(rules)t Fn(.)38 b(Eac)o(h)22 b(rule)f(is)g(view)o
2254 (ed)f(as)j(a)f(sequence)e(of)j(grammar)d(sym)o(b)q(ols,)h(the)164
2255 1964 y(ob)s(ject)10 b(of)i(eac)o(h)e Fd(return)f Fn(statemen)o(t)h(in)g
2256 (a)i(Lex)f(action)g(b)q(eing)g(a)g(sequence)f(consisting)i(of)164
2257 2024 y(a)g(single)f(grammar)f(sym)o(b)q(ol.)18 b(The)12
2258 b(leftmost)e(sym)o(b)q(ol)g(of)i(a)f(rule)g(is)h(called)e(the)h
2259 Fg(left-hand)164 2084 y(side)20 b Fn(\()p Fg(LHS)6 b
2260 Fn(\).)17 b(The)f Fg(right-hand)j(side)h Fn(\()p Fg(RHS)6
2261 b Fn(\))17 b(comprises)e(the)h(rule's)g(other)g(sym)o(b)q(ols.)164
2262 2144 y(A)24 b(sym)o(b)q(ol's)f(p)q(osition)h(in)g(a)h(rule)f(together)g
2263 (with)g(an)h(attribute)f(of)h(that)f(sym)o(b)q(ol)164
2264 2204 y(constitute)17 b(an)g Fg(attribute)j(o)n(c)n(curr)n(enc)n(e)g
2265 Fn(\(concisely)l(,)c(an)h Fg(o)n(c)n(curr)n(enc)n(e)t
2266 Fn(\))g(in)g(that)g(rule.)23 b(If)164 2264 y(the)18 b(attribute)f(in)h
2267 (question)g(is)g Fi(a)p Fn(,)f(the)h(o)q(ccurrence)f(is)h(said)g(to)h
2268 (b)q(e)f(an)g Fg(o)n(c)n(curr)n(enc)n(e)h(of)164 2325
2269 y Fi(a)p Fn(.)i(Supp)q(osing)c(the)f Fd(@attributes)d
2270 Fn(declaration)j(of)g(section)g(3)h(and)g(the)f(rule:)292
2271 2426 y Fd(num)127 b(:)179 b(bitlist)23 b(DOT)127 b(bitlist)p
2274 8 8 bop 164 162 a Fk(5)49 b(A)l(TTRIBUTE)15 b(DEFINITIONS)880
2275 b Fn(8)164 307 y(the)23 b(attribute)h(o)q(ccurrence)f
2276 Fd(scale)e Fn(of)j(the)g(leftmost)e(app)q(earance)i(of)g
2277 Fd(bitlist)d Fn(is)164 367 y(denoted)j(in)f(Ox)g(co)q(de)h(as)g
2278 Fd(bitlist.0.)o(sca)o(le)o Fn(,)e(while)h(the)g(attribute)h(o)q
2279 (ccurrence)164 428 y Fd(scale)12 b Fn(of)h(the)h(righ)o(tmost)e(app)q
2280 (earance)i(of)g Fd(bitlist)d Fn(is)i(denoted)h Fd(bitlist.1.)o(sc)o
2281 (ale)o Fn(.)237 488 y(In)19 b(general,)g(attribute)g(o)q(ccurrences)g
2282 (are)g(named)f(b)o(y)h(a)g(grammar)f(sym)o(b)q(ol,)g(fol-)164
2283 548 y(lo)o(w)o(ed)13 b(b)o(y)h(a)h(p)q(erio)q(d,)f(follo)o(w)o(ed)g
2284 (optionally)g(b)o(y)f(a)i(non-negativ)o(e)f(decimal)e(in)o(teger)h(and)
2285 164 608 y(another)20 b(p)q(erio)q(d,)g(follo)o(w)o(ed)f(b)o(y)f(the)h
2286 (name)g(of)g(an)h(attribute)f(of)h(that)g(sym)o(b)q(ol.)29
2287 b(The)164 668 y(in)o(teger)12 b(and)i(the)f(second)h(p)q(erio)q(d)f
2288 (are)h(needed)e(only)h(when)h(a)f(giv)o(en)g(grammar)e(sym)o(b)q(ol)164
2289 729 y(app)q(ears)k(more)e(than)i(once)f(in)g(the)g(rule,)g(in)g(whic)o
2290 (h)f(case)i(those)f(distinct)g(app)q(earances)164 789
2291 y(are)h(n)o(um)o(b)q(ered)f(from)g(left)g(to)i(righ)o(t)f(with)g
2292 (consecutiv)o(e)f(increasing)h(in)o(tegers)f(starting)164
2293 849 y(with)i Fd(0)p Fn(.)21 b(F)l(or)16 b(a)h(sym)o(b)q(ol)e
2294 Fd(X)h Fn(with)g(an)h(attribute)f Fd(a)p Fn(,)f Fd(X.a)g
2295 Fn(is)h(a)h(synon)o(ym)e(for)h Fd(X.0.a)p Fn(.)237 909
2296 y(A)k(giv)o(en)e(rule)i(and)g(an)g(attribute)g(o)q(ccurrence)f(in)g
2297 (that)i(rule)e(constitute)g(an)h Fg(at-)164 969 y(tribute)e(o)n(c)n
2298 (curr)n(enc)n(e)i Fn(in)c(the)g(grammar.)164 1136 y Fo(5)83
2299 b(A)n(ttribute)27 b(de\014nitions)164 1245 y Fn(F)l(or)20
2300 b(eac)o(h)g(rule,)g(the)g(Ox)g(user)g(ma)o(y)f(pro)o(vide)h(an)g
2301 Fg(attribute)i(r)n(efer)n(enc)n(e)g(se)n(ction)t Fn(,)f(de-)164
2302 1305 y(limited)15 b(b)o(y)j Fd(@)p Fc(f)g Fn(and)g Fd(@)p
2303 Fc(g)p Fn(,)g(and)h(optionally)f(con)o(taining)g(de\014nitions)g(of)g
2304 (attribute)g(o)q(c-)164 1366 y(currences)i(of)h(the)f(giv)o(en)g(rule.)
2305 34 b(A)o(ttribute)19 b(o)q(ccurrences)h(ma)o(y)g(b)q(e)g(de\014ned)h
2306 (therein)164 1426 y(in)16 b(terms)f(of)i(the)g(rule's)f(other)g
2307 (attribute)h(o)q(ccurrences)f(and)h(C)g(co)q(de)g(suc)o(h)f(as)i
2308 (global)164 1486 y(v)m(ariables,)e(constan)o(ts,)g(macros,)f(and)i
2309 (function)f(calls.)164 1630 y Fb(5.1)70 b(Inherited)21
2310 b(vs.)31 b(syn)n(thesized)22 b(attributes)164 1723 y
2311 Fn(An)16 b(attribute)g(o)q(ccurrence)f Fi(o)i Fn(in)f(a)h(rule)e
2312 Fi(R)i Fn(is)f Fg(synthesize)n(d)22 b Fn(if)15 b(and)i(only)f(if)224
2313 1824 y(1.)24 b Fi(o)17 b Fn(is)f(on)g(the)g(LHS)h(of)f
2314 Fi(R)h Fn(and)g(the)f(attribute)g(reference)f(section)g(of)i
2315 Fi(R)g Fn(con)o(tains)286 1885 y(a)g(de\014nition)e(of)i
2316 Fi(o)p Fn(,)f(or)224 1986 y(2.)24 b Fi(o)16 b Fn(is)g(on)g(the)g(RHS)f
2317 (of)i Fi(R)f Fn(and)g(the)g(attribute)g(reference)e(section)h(of)h
2318 Fi(R)h Fn(con)o(tains)286 2047 y(no)g(de\014nition)e(of)i
2319 Fi(o)p Fn(.)237 2148 y(An)f(attribute)g(o)q(ccurrence)g
2320 Fi(o)g Fn(in)g(a)h(rule)e Fi(R)i Fn(is)f Fg(inherite)n(d)22
2321 b Fn(if)15 b(and)i(only)f(if)224 2250 y(1.)24 b Fi(o)17
2322 b Fn(is)f(on)g(the)g(LHS)h(of)f Fi(R)h Fn(and)g(the)f(attribute)g
2323 (reference)f(section)g(of)i Fi(R)g Fn(con)o(tains)286
2324 2310 y(no)g(de\014nition)e(of)i Fi(o)p Fn(,)f(or)224
2325 2412 y(2.)24 b Fi(o)16 b Fn(is)g(on)g(the)g(RHS)f(of)i
2326 Fi(R)f Fn(and)g(the)g(attribute)g(reference)e(section)h(of)h
2327 Fi(R)h Fn(con)o(tains)286 2472 y(a)g(de\014nition)e(of)i
2330 9 9 bop 164 162 a Fk(5)49 b(A)l(TTRIBUTE)15 b(DEFINITIONS)880
2331 b Fn(9)237 307 y(An)18 b(error)f(message)g(is)h(issued)g(if)f(an)h
2332 (attribute)f(is)h(found)g(to)h(ha)o(v)o(e)d(b)q(oth)j(syn)o(the-)164
2333 367 y(sized)c(and)h(inherited)e(o)q(ccurrences)i(in)f(the)g(grammar.)20
2334 b(An)15 b(attribute)g(is)h Fg(synthesize)n(d)164 428
2335 y Fn(if)23 b(and)h(only)g(if)f(it)g(has)i(at)f(least)f(one)h(o)q
2336 (ccurrence,)g(and)h(its)e(ev)o(ery)f(o)q(ccurrence)h(is)164
2337 488 y(syn)o(thesized.)c(An)c(attribute)f(is)g Fg(inherite)n(d)20
2338 b Fn(if)14 b(and)h(only)g(if)f(it)g(has)h(at)g(least)g(one)f(o)q(ccur-)
2339 164 548 y(rence,)k(and)g(its)h(ev)o(ery)d(o)q(ccurrence)i(is)g
2340 (inherited.)27 b(It)17 b(follo)o(ws)i(from)e(the)h(ab)q(o)o(v)o(e)g
2341 (that)164 608 y(the)c(grammar's)f(start)i(sym)o(b)q(ol)e(ma)o(y)g(ha)o
2342 (v)o(e)h(only)g(syn)o(thesized)f(attributes.)21 b(Referring)164
2343 668 y(to)e(returned)f(tok)o(ens)g(as)h(rules)f(emphasizes)f(the)h
2344 (equal)g(status)h(of)g(tok)o(ens)f(and)h(non-)164 729
2345 y(terminals,)e(inasm)o(uc)o(h)g(as)i(eac)o(h)f(kind)g(of)h(sym)o(b)q
2346 (ol)e(\(except)h(the)g(start)h(sym)o(b)q(ol\))e(ma)o(y)164
2347 789 y(ha)o(v)o(e)d(b)q(oth)h(syn)o(thesized)e(and)i(inherited)e
2348 (attributes.)20 b(Since)14 b(eac)o(h)g(sym)o(b)q(ol)f(has)i(a)g(dis-)
2349 164 849 y(tinct)j(name)g(space)i(\(section)e(3.1\),)i(same-named)d
2350 (attributes)i(of)h(di\013eren)o(t)e(sym)o(b)q(ols)164
2351 909 y(are)h(di\013eren)o(t)f(attributes,)h(and)h(ma)o(y)d(di\013er)i
2352 (as)g(to)h(whether)e(they)h(are)g(inherited)f(or)164
2353 969 y(syn)o(thesized.)237 1029 y(F)l(or)e(eac)o(h)f(parse-tree)g(no)q
2354 (de)h(except)f(the)g(ro)q(ot)i(no)q(de,)e(t)o(w)o(o)h(rules)f(of)h(the)
2355 f(Ox)g(input)164 1090 y(sp)q(eci\014cation)21 b(are)h(of)g(particular)f
2356 (in)o(terest.)36 b(The)22 b Fg(home)g(rule)k Fn(is)21
2357 b(the)h(rule)e(applied)164 1150 y(at)i(the)g(no)q(de,)h(i.e.,)e(the)h
2358 (rule)f(whose)i(LHS)f(is)f(the)h(lab)q(el)f(of)h(the)g(giv)o(en)f(no)q
2359 (de,)i(and)164 1210 y(whose)c(RHS)g(sym)o(b)q(ols)e(are)i(the)g(lab)q
2360 (els)f(of)h(the)g(c)o(hildren)e(of)i(the)f(no)q(de.)30
2361 b(The)19 b Fg(p)n(ar)n(ent)164 1270 y(rule)24 b Fn(is)19
2362 b(the)g(rule)g(applied)f(at)i(the)f(no)q(de's)h(paren)o(t.)31
2363 b(The)19 b(attribute)g(de\014nition)g(of)h(a)164 1330
2364 y(syn)o(thesized)c(attribute)h(instance)g(of)h(a)g(giv)o(en)e(no)q(de)i
2365 (is)g(asso)q(ciated)g(with)f(the)g(no)q(de's)164 1391
2366 y(home)i(rule)g(\(i.e.,)f(it)h(app)q(ears)i(in)f(the)f(attribute)h
2367 (reference)e(section)h(for)h(that)g(rule\),)164 1451
2368 y(and)d(de\014nitions)g(of)g(inherited)e(attribute)h(instances)h(are)g
2369 (similarly)c(asso)q(ciated)18 b(with)164 1511 y(the)e(paren)o(t)g
2370 (rule.)237 1571 y(In)i(a)g(legal)g(input)g(sp)q(eci\014cation,)g(eac)o
2371 (h)f(attribute)h(of)g(a)h(sym)o(b)q(ol)e(app)q(earing)i(in)f(a)164
2372 1631 y(rule)e(is)g(either)g(syn)o(thesized)f(or)i(inherited,)e(but)i
2373 (not)g(b)q(oth,)g(so)h(the)e(de\014nitions)g(of)h(all)164
2374 1692 y(attributes)f(\\\014t)h(together")g(completely)c(and)k(without)f
2375 (con)o(tradiction.)164 1836 y Fb(5.2)70 b(A)n(ttribute)21
2376 b(reference)g(sections)h(in)g(the)g(Y-\014le)164 1928
2377 y Fn(The)c Fg(rules)i(se)n(ction)j Fn(of)c(a)g(Y)l(acc)f(\014le)g
2378 (follo)o(ws)g(the)g(\014rst)h Fd(\045\045)f Fn(mark)f([Johnson)g(75)q
2379 (],)h(and)164 1989 y(con)o(tains)g(the)h(pro)q(ductions)g(\(rules\))f
2380 (of)g(the)g(grammar.)26 b(As)19 b(men)o(tioned)d(ab)q(o)o(v)o(e,)i(the)
2381 164 2049 y(Ox)i(user)h(ma)o(y)e(augmen)o(t)g(eac)o(h)h(rule)g(b)o(y)g
2382 (an)h(attribute)f(reference)f(section,)i(eac)o(h)f(of)164
2383 2109 y(whic)o(h)d(is)g(delimited)d(b)o(y)j Fd(@)p Fc(f)g
2384 Fn(and)h Fd(@)p Fc(g)p Fn(,)f(and)h(whic)o(h)f(con)o(tains)h(zero)f(or)
2385 h(more)e Fg(attribute)164 2169 y(de\014nitions)t Fn(.)58
2386 b(When)18 b(presen)o(t,)g(the)h(attribute)f(reference)f(section)h(is)g
2387 (the)g(last)h(item)164 2229 y(\(other)c(than)h(a)g(terminating)e
2388 (semicolon\))g(in)h(a)g(rule.)1180 2211 y Fh(4)1221 2229
2389 y Fn(Conceptually)l(,)f(an)i(attribute)164 2290 y(de\014nition)g(has)g
2390 (a)h Fg(dep)n(endency)h(p)n(art)36 b Fn(and)17 b(an)g
2391 Fg(evaluation)h(p)n(art)5 b Fn(,)31 b(but)16 b(syn)o(tactically)l(,)p
2392 164 2333 648 2 v 220 2364 a Ff(4)239 2379 y Fe(Th)o(us)c(it)f(do)q(es)i
2393 (not)f(precede)i(an)o(y)d(Y)m(acc)i(action)e(or)h(the)g(Y)m(acc)h
2394 (reserv)o(ed)h(w)o(ord)d Fa(\045prec)g Fe(in)h(the)g(rule,)164
2395 2429 y(and)i(an)o(y)f(follo)o(wing)e(iden)o(ti\014er)k(m)o(ust)d(b)q(e)
2396 j(the)f(LHS)g(of)g(the)g(next)h(rule.)p eop
2398 10 10 bop 164 162 a Fk(5)49 b(A)l(TTRIBUTE)15 b(DEFINITIONS)855
2399 b Fn(10)164 307 y(the)19 b(parts)h(ma)o(y)e(b)q(e)i(com)o(bined)d(or)j
2400 (separate.)31 b(There)19 b(are)h(three)f(mo)q(des)f(of)i(expres-)164
2401 367 y(sion)14 b(of)h(attribute)e(de\014nitions,)h(and)h(di\013eren)o(t)
2402 e(mo)q(des)h(ma)o(y)e(b)q(e)i(used)g(within)g(a)g(single)164
2403 428 y(attribute)20 b(reference)f(section.)33 b(Eac)o(h)20
2404 b(attribute)h(de\014nition)f(b)q(egins)g(with)h(a)f Fg(de\014ni-)164
2405 488 y(tion)f(mo)n(de)f(annunciator)24 b Fn(\()p Fd(@e)p
2406 Fn(,)17 b Fd(@i)p Fn(,)g(or)h Fd(@m)p Fn(,\))e(and)j(is)e(terminated)f
2407 (b)o(y)h(another)h(mo)q(de)164 548 y(ann)o(unciator)f(or)f(b)o(y)32
2408 b Fd(@)p Fc(g)p Fn(.)164 678 y Fj(5.2.1)55 b(Explicit)17
2409 b(mo)r(de)164 760 y Fn(In)h(this,)g(the)f(most)h(p)q(o)o(w)o(erful)f
2410 (and)i(most)e(v)o(erb)q(ose)h(attribute)g(de\014nition)g(mo)q(de,)35
2411 b(an)164 810 y(attribute)14 b(de\014nition)g(tak)o(es)g(the)g(form)f
2412 (of)h Fd(@e)g Fn(\(mnemonic)d(for)j Fg(explicit)21 b
2413 Fn(\))14 b(follo)o(w)o(ed)f(b)o(y)164 859 y(a)19 b Fg(dep)n(endency)j
2414 (expr)n(ession)h Fn(\(whic)o(h)18 b(expresses)g(the)h(dep)q(endency)f
2415 (part)i(of)f(the)g(de\014-)164 909 y(nition\))c(follo)o(w)o(ed)f(b)o(y)
2416 h(an)h Fg(evaluation)j(expr)n(ession)g Fn(\(whic)o(h)c(expresses)g(the)
2417 g(ev)m(aluation)164 959 y(part\).)20 b(In)12 b(the)g(follo)o(wing)g
2418 (example,)e(the)i(attribute)g(reference)f(section)g(con)o(tains)i
2419 (three)164 1009 y(attribute)j(de\014nitions,)f(eac)o(h)h(expressed)g
2420 (in)g(the)g(explicit)e(mo)q(de:)273 1100 y Fa(num)108
2421 b(:)153 b(bitlist)20 b(DOT)108 b(bitlist)447 1150 y(@{)22
2422 b(@e)f(num.value)f(:)i(bitlist.0.value)c(bitlist.1.value;)578
2423 1200 y(@num.value@)i(=)h(@bitlist.0.value@)d(+)k(@bitlist.1.value@)c(;)
2424 513 1250 y(@e)j(bitlist.0.scale)e(:)i(;)578 1299 y(@bitlist.0.scale@)d
2425 (=)k(0)f(;)513 1349 y(@e)g(bitlist.1.scale)e(:)i(bitlist.1.length)e(;)
2426 578 1399 y(@bitlist.1.scale@)f(=)k(-@bitlist.1.lengt)o(h@)d(;)447
2427 1449 y(@})447 1499 y(;)237 1600 y Fn(A)f(dep)q(endency)g(expression)g
2428 (mak)o(es)f(explicit)g(the)h(constrain)o(ts)h(on)g(the)f(order)h(of)164
2429 1661 y(execution)e(of)i(ev)m(aluation)f(expressions)g(and)h(is)f(a)g
2430 (non-empt)o(y)f(list)h(of)g(attribute)g(o)q(c-)164 1721
2431 y(currences)f(of)g(the)h(rule,)f(follo)o(w)o(ed)f(b)o(y)h(a)h(colon,)g
2432 (follo)o(w)o(ed)e(b)o(y)h(a)h(p)q(ossibly)g(empt)o(y)e(list)164
2433 1781 y(of)21 b(attribute)f(o)q(ccurrences)g(and)h(a)g(terminating)e
2434 (semicolon.)33 b(The)20 b(o)q(ccurrences)h(to)164 1841
2435 y(the)e(left)f(of)h(the)g(colon)g(are)g(said)g(to)g Fg(dep)n(end)i(up)n
2436 (on)h Fn(\(hence)d(are)g(called)37 b Fg(dep)n(endents)164
2437 1901 y Fn(of)s(\))16 b(those)g(to)g(the)f(righ)o(t,)g(and)h(are)f(the)h
2438 (o)q(ccurrences)f Fg(de\014ne)n(d)21 b Fn(in)15 b(the)h(giv)o(en)e
2439 (attribute)164 1962 y(de\014nition.)21 b(The)15 b(o)q(ccurrences)h(to)g
2440 (the)f(righ)o(t)h(are)f(called)g Fg(dep)n(ende)n(es)21
2441 b Fn(of)16 b(those)g(on)g(the)164 2022 y(left.)21 b(An)c(ev)m(aluation)
2442 g(expression)f(is)g(basically)g(a)h(C)g(co)q(de)g(fragmen)o(t)e(that)i
2443 (ma)o(y)e(con-)164 2082 y(tain)j Fg(attribute)h(r)n(efer)n(enc)n(es)t
2444 Fn(,)36 b(eac)o(h)17 b(of)h(whic)o(h)f(is)h(an)g(attribute)g(o)q
2445 (ccurrence)e(enclosed)164 2142 y(within)g Fd(@)g Fn(sym)o(b)q(ols.)21
2446 b(A)o(ttribute)15 b(references)g(b)q(eha)o(v)o(e)h(as)h(C)g(v)m
2447 (ariables,)f(and)h(all)f(of)h(the)164 2202 y(usual)i(C)g(op)q(erators,)
2448 h(suc)o(h)e(as)h(those)g(for)g(arithmetic,)d(logical,)i(and)h(p)q(oin)o
2449 (ter)g(op)q(era-)164 2263 y(tions,)14 b(ma)o(y)e(b)q(e)i(applied)f(to)h
2450 (them,)e(as)i(in)g(a)g(C)g(program.)20 b(The)13 b(ev)m(aluation)h
2451 (expression)164 2323 y(imme)o(diately)f(follo)o(ws)j(the)g(semicolon)e
2452 (of)j(the)f(dep)q(endency)f(expression.)237 2383 y(The)21
2453 b(Ox-generated)g(ev)m(aluator)h(c)o(ho)q(oses)g(an)f(ev)m(aluation)h
2454 (order)f(suc)o(h)g(that)g(the)164 2443 y(ev)m(aluation)16
2455 b(expressions)f(for)h(all)f(of)h(the)f(dep)q(endees)g(in)g(the)h
2456 (de\014nition)f(are)g(executed)p eop
2458 11 11 bop 164 162 a Fk(5)49 b(A)l(TTRIBUTE)15 b(DEFINITIONS)855
2459 b Fn(11)164 307 y(b)q(efore)13 b(those)h(of)f(the)g(dep)q(enden)o(ts.)
2460 20 b(Usually)12 b(there)g(is)h(a)h(single)e(dep)q(enden)o(t)h(in)f(a)i
2461 (giv)o(en)164 367 y(attribute)21 b(de\014nition,)i(but)e(in)h(some)e
2462 (cases,)j(co)q(de)f(ma)o(y)e(b)q(e)i(made)f(more)f(compact)164
2463 428 y(b)o(y)e(placing)f(more)g(than)i(one)f(attribute)g(o)q(ccurrence)g
2464 (in)f(a)i(dep)q(enden)o(t)f(list,)f(thereb)o(y)164 488
2465 y(com)o(bining)g(the)i(de\014nitions)g(of)g(those)h(in)f(the)g(list.)29
2466 b(The)19 b(ev)m(aluation)g(expression)g(is)164 548 y(executed)10
2467 b(on)j(b)q(ehalf)f(of)g(the)g(dep)q(enden)o(ts)f Fg(taken)k(as)e(a)h
2468 (set)5 b Fn(,)12 b(rather)g(than)h(once)e(for)h(eac)o(h)164
2469 608 y(dep)q(enden)o(t.)28 b(This)19 b(is)g(kno)o(wn)g(as)g
2470 Fg(solving)25 b Fn(the)19 b(attribute)f(instances)h(corresp)q(onding)
2471 164 668 y(to)e(the)f(o)q(ccurrences)f(in)h(that)h(set.)164
2472 798 y Fj(5.2.2)55 b(Implicit)16 b(mo)r(de)164 880 y Fn(The)i
2473 Fg(implicit)h(mo)n(de)t Fn(,)36 b(whic)o(h)17 b(is)h(the)f(usual)i(mo)q
2474 (de)e(of)h(expressing)g(attribute)f(de\014ni-)164 930
2475 y(tions,)g(syn)o(tactically)e(com)o(bines)f(the)j(dep)q(endency)f(part)
2476 h(with)g(the)f(ev)m(aluation)h(part.)164 980 y(The)f(follo)o(wing)g(Ox)
2477 g(co)q(de)h(is)f(equiv)m(alen)o(t)e(to)j(that)g(of)f(the)g(preceding)g
2478 (example.)273 1071 y Fa(num)108 b(:)153 b(bitlist)20
2479 b(DOT)108 b(bitlist)447 1121 y(@{)22 b(@i)f(@num.value@)f(=)h
2480 (@bitlist.0.value@)d(+)k(@bitlist.1.value@)o(;)513 1171
2481 y(@i)f(@bitlist.0.scale@)d(=)k(0;)513 1221 y(@i)f(@bitlist.1.scale@)d
2482 (=)44 b(-@bitlist.1.leng)o(th@;)447 1270 y(@})447 1320
2483 y(;)164 1422 y Fn(In)20 b(this)g(mo)q(de,)g(an)h(attribute)e
2484 (de\014nition)h(tak)o(es)g(the)g(form)f(of)i Fd(@i)39
2485 b Fn(follo)o(w)o(ed)20 b(b)o(y)f(an)164 1482 y(ev)m(aluation)13
2486 b(expression.)20 b(The)13 b(mo)q(de)g(ann)o(unciator)g
2487 Fd(@i)26 b Fn(informs)12 b(Ox)h(that)g(the)g(de\014ni-)164
2488 1542 y(tion)i(has)h(a)f(single)g(dep)q(enden)o(t,)f(namely)f(the)i
2489 (\014rst)g(attribute)g(o)q(ccurrence)f(referenced)164
2490 1602 y(in)k(the)h(ev)m(aluation)g(expression.)28 b(The)19
2491 b(dep)q(endees)f(in)h(the)f(de\014nition)g(consist)h(of)g(all)164
2492 1663 y Fg(other)j Fn(attribute)15 b(o)q(ccurrences)h(referenced)f(in)h
2493 (the)g(ev)m(aluation)g(expression.)164 1793 y Fj(5.2.3)55
2494 b(Mixed)18 b(mo)r(de)164 1885 y Fg(Mixe)n(d)h(mo)n(de)39
2495 b Fn(attribute)17 b(de\014nitions)h(are)g(announced)g(b)o(y)g(the)f
2496 (reserv)o(ed)g(w)o(ord)36 b Fd(@m)p Fn(.)164 1945 y(There)21
2497 b(follo)o(w)g(one)h(or)g(more)e(dep)q(enden)o(ts,)i(a)g(semicolon,)f
2498 (and)h(an)g(ev)m(aluation)f(ex-)164 2005 y(pression.)38
2499 b(The)22 b(o)q(ccurrences)g(referenced)e(in)i(the)f(ev)m(aluation)h
2500 (expression,)h(except)164 2066 y(those)d(that)h(also)f(app)q(ear)h(b)q
2501 (et)o(w)o(een)e Fd(@m)g Fn(and)h(the)g(semicolon,)f(are)g(tak)o(en)h
2502 (to)g(b)q(e)g(the)164 2126 y(dep)q(endees)g(in)g(the)g(de\014nition.)33
2503 b(Th)o(us)21 b(the)f(dep)q(enden)o(ts)g(are)g(giv)o(en)g(explicitly)d
2504 (and)164 2186 y(the)i(dep)q(endees)g(implicitly)-5 b(.)28
2505 b(The)20 b(co)q(de)g(in)f(the)g(follo)o(wing)g(example)e(has)k(the)e
2506 (same)164 2246 y(meaning)c(as)i(that)g(in)f(the)g(previous)g(t)o(w)o
2509 12 12 bop 164 162 a Fk(5)49 b(A)l(TTRIBUTE)15 b(DEFINITIONS)855
2510 b Fn(12)273 307 y Fa(num)108 b(:)153 b(bitlist)20 b(DOT)108
2511 b(bitlist)447 357 y(@{)22 b(@m)f(num.value)f(;)578 407
2512 y(@num.value@)g(=)h(@bitlist.0.value@)d(+)k(@bitlist.1.value@)o(;)513
2513 457 y(@i)f(@bitlist.1.scale@)d(=)k(-)f(@bitlist.1.length@;)513
2514 506 y(@m)g(bitlist.0.scale)e(;)i(@bitlist.0.scale@)e(=)i(0;)447
2515 556 y(@})447 606 y(;)164 750 y Fb(5.3)70 b(A)n(ttribute)21
2516 b(reference)g(sections)h(in)g(the)g(L-\014le\(s\))164
2517 843 y Fn(De\014nitions)14 b(of)g(inherited)e(attributes)i(of)g(tok)o
2518 (ens)g(are)g(asso)q(ciated)h(with)e(rules)h(app)q(ear-)164
2519 903 y(ing)e(in)g(the)h(Y-\014le,)f(while)f(their)h(syn)o(thesized)f
2520 (attributes)h(are)h(de\014ned)f(in)g(the)g(L-\014le\(s\).)164
2521 963 y(Ox)19 b(pro)q(cesses)h(the)f(Y-\014le)f(b)q(efore)i(pro)q
2522 (cessing)g(the)f(L-\014le\(s\).)30 b(If)19 b(a)h(giv)o(en)e(attribute)
2523 164 1023 y(o)q(ccurrence)d(of)h(a)g(tok)o(en)f(is)g(not)h(de\014ned)g
2524 (in)f(the)g(Y-\014le,)g(then)g(the)h(attribute)f(is)g(tak)o(en)164
2525 1084 y(to)i(b)q(e)f(syn)o(thesized.)237 1144 y(Lexical)h(rules)g(are)h
2526 (asso)q(ciated)h(with)e Fd(return)f Fn(statemen)o(ts)g(in)i(Lex)f
2527 (actions.)26 b(Af-)164 1204 y(ter)19 b(the)h(terminating)e(semicolon)g
2528 (of)i(eac)o(h)f(suc)o(h)h(statemen)o(t,)e(there)i(ma)o(y)e(app)q(ear)j
2529 (a)164 1264 y(p)q(ossibly)16 b(empt)o(y)e Fg(attribute)k(r)n(efer)n
2530 (enc)n(e)f(se)n(ction)t Fn(,)f(delimited)d(b)o(y)i Fd(@)p
2531 Fc(f)h Fn(and)g Fd(@)p Fc(g)p Fn(,)f(in)h(whic)o(h)164
2532 1324 y(are)g(de\014ned)g(all)g(of)h(the)f(syn)o(thesized)f(attributes)h
2533 (of)g(the)g Fd(return)p Fn(ed)e(tok)o(en.)237 1385 y(Note)20
2534 b(that)g(eac)o(h)g(p)q(oin)o(t)g(of)h Fd(return)d Fn(of)i
2535 Fd(yylex)f Fn(m)o(ust)f(b)q(e)j Fg(explicit)26 b Fn(in)20
2536 b(the)g(sense)164 1445 y(that)c(the)f(text)f(m)o(ust)g(b)q(ear)i(the)f
2537 (C)h(reserv)o(ed)e(w)o(ord)h Fd(return)p Fn(.)k(In)c(particular,)g
2538 Fd(return)p Fn(s)164 1505 y(m)o(ust)f(not)h(b)q(e)h(done)f(within)g(C)g
2539 (macros,)f(unless)i(the)e(L-\014le)i(is)f(passed)h(through)g(the)f(C)
2540 164 1565 y(prepro)q(cessor)g(prior)e(to)h(pro)q(cessing)h(b)o(y)e(Ox.)
2541 20 b(Guaran)o(teeing)14 b(this)g(prop)q(ert)o(y)g(of)g
2542 Fd(yylex)164 1625 y Fn(is)i(the)g(resp)q(onsibilit)o(y)f(of)i(the)f(Ox)
2543 f(user|it)h(is)g(not)h(c)o(hec)o(k)o(ed)d(b)o(y)h(Ox.)164
2544 1755 y Fj(5.3.1)55 b(Generalit)n(y)17 b(of)i(Ox)164 1837
2545 y Fn(The)14 b(class)h(of)f(attribute)g(grammars)f(accepted)h(b)o(y)f
2546 (Ox)h(is)g(restricted)f(only)i(as)f(follo)o(ws:)164 1887
2547 y(syn)o(thesized)e(attributes)h(of)g(tok)o(ens)g(do)h(not)f(ha)o(v)o(e)
2548 g(dep)q(endees.)20 b(A)o(ttribute)11 b(de\014nitions)164
2549 1937 y(in)22 b(the)g(L-\014le\(s\))h(can)f(th)o(us)g(b)q(e)h(written)f
2550 (more)f(simply)f(than)j(in)f(the)g(Y-\014le:)32 b(eac)o(h)164
2551 1987 y(attribute)18 b(o)q(ccurrence)f(is)i(de\014ned)f(b)o(y)f
2552 (referring)h(to)g(it)g(in)g(C)h(co)q(de,)f(exactly)f(once)h(in)164
2553 2036 y(the)g(attribute)h(reference)d(section)j(asso)q(ciated)g(with)f
2554 (the)h Fd(return)d Fn(statemen)o(t,)h(as)i(in)164 2086
2555 y(the)d(follo)o(wing)g(example)e(\(wherein)h Fd(CONST)p
2556 Fn('s)g(only)h(syn)o(thesized)f(attribute)h(is)g Fd(val)p
2557 Fn(\):)273 2178 y Fa([0-9]+)64 b(return\(CONST\);)19
2558 b(@{)i(sscanf\(yytext,"\045d",)o(&@CON)o(ST.va)o(l@\);)d(@})164
2559 2279 y Fn(Th)o(us)f(mo)q(de)e(declarations)i(and)g(dep)q(endency)f
2560 (expressions)g(are)h(unnecessary)f(in)g(the)164 2339
2561 y(L-\014le\(s\).)p eop
2563 13 13 bop 164 162 a Fk(5)49 b(A)l(TTRIBUTE)15 b(DEFINITIONS)855
2564 b Fn(13)164 307 y Fj(5.3.2)55 b(Ox)19 b(adaptation)g(to)f(Lex's)f
2565 (line-orien)n(ted)f(syn)n(tax)164 400 y Fn(When)e(Ox)f(is)g(pro)q
2566 (cessing)h(the)g(L-\014le)f(and)h(has)h(recognized)e(a)g(rule)g
2567 (\(i.e.,)f(the)i(ob)s(ject)f(of)164 460 y(a)19 b Fd(return)d
2568 Fn(statemen)o(t\),)g(if)i(the)g Fd(return)p Fn(ed)e(tok)o(en)i(has)h
2569 (syn)o(thesized)e(attributes,)h(Ox)164 520 y(lo)q(oks)c(for)g(an)h
2570 (attribute)e(reference)f(section)h(follo)o(wing)h(the)f
2571 Fd(return)f Fn(statemen)o(t.)18 b(Ox's)164 580 y(rules)11
2572 b(for)h(recognizing)f(attribute)g(reference)e(sections)j(in)f(the)g
2573 (L-\014le)g(are)h(adapted)g(from)164 640 y(the)h(w)o(a)o(y)g(Lex)h
2574 (actions)g(are)f(terminated:)18 b(Ox)13 b(giv)o(es)g(up)h(lo)q(oking)g
2575 (for)g(an)g(attribute)f(ref-)164 700 y(erence)e(section)i(when)f(it)h
2576 (pairs)f(the)h(righ)o(tmost)e(righ)o(t)i(curly)e(brace)i(in)f(the)g
2577 (action)h(with)164 761 y(the)h(leftmost)f(left)g(curly)g(brace,)h(or)h
2578 (when)f(it)g(encoun)o(ters)g(a)g(newline)f(unprotected)h(b)o(y)164
2579 821 y(curly)h(braces.)22 b(Newlines)14 b(are)j(insigni\014can)o(t)e
2580 (inside)h(attribute)g(reference)e(sections.)237 881 y(Examples)20
2581 b(of)h(correct)f(and)i(incorrect)e(syn)o(tax)h(are)g(sho)o(wn)h(b)q
2582 (elo)o(w.)35 b(All)20 b(of)h(the)164 941 y(correct)16
2583 b(forms)f(sho)o(wn)i(are)f(seman)o(tically)e(equiv)m(alen)o(t)g(to)j
2584 (one)f(another.)237 1055 y Fc(\017)24 b Fn(incorrect)15
2585 b(\(attribute)h(reference)f(section)h(app)q(ears)i(to)f(the)f(righ)o(t)
2586 g(of)h(the)f(righ)o(t-)286 1116 y(most)f(curly)h(brace\):)286
2587 1238 y Fd([a-zA-Z]+)22 b({)k(count\(\);)c(return)i(ID;)g(})h(@{)g
2588 (@ID.name@)e(=)i(id\(\);)f(@})237 1361 y Fc(\017)g Fn(incorrect)d
2589 (\(attribute)h(reference)e(section)i(not)h(part)g(of)f(rule,)h(since)e
2590 (the)h(Lex)286 1421 y(action)16 b(is)g(terminated)f(b)o(y)g(an)i
2591 (unprotected)f(newline\):)286 1543 y Fd([a-zA-Z]+)22
2592 b(count\(\);)h(return)g(ID;)542 1603 y(@{)i(@ID.name@)d(=)k(id\(\);)e
2593 (@})237 1726 y Fc(\017)g Fn(correct:)286 1848 y Fd([a-zA-Z]+)e({)k
2594 (count\(\);)c(return)i(ID;)50 b(@{)25 b(@ID.name@)d(=)j(id\(\);)f(@})h
2595 (})237 1971 y Fc(\017)f Fn(correct:)286 2093 y Fd([a-zA-Z]+)e(return)i
2596 (ID;)g(@{)h(count\(\);)e(@ID.name@)f(=)j(id\(\);)f(@})237
2597 2216 y Fc(\017)g Fn(correct:)286 2338 y Fd([a-zA-Z]+)e({)k(count\(\);)c
2598 (return)i(ID;)594 2398 y(@{)g(@ID.name@)f(=)i(id\(\);)f(@})542
2601 14 14 bop 164 162 a Fk(5)49 b(A)l(TTRIBUTE)15 b(DEFINITIONS)855
2602 b Fn(14)237 307 y Fc(\017)24 b Fn(correct:)286 430 y
2603 Fd([a-zA-Z]+)e(count\(\);)h(return)g(ID;)51 b(@{)1132
2604 490 y(@ID.name@)22 b(=)j(id\(\);)1081 550 y(@})164 680
2605 y Fj(5.3.3)55 b(Resolution)18 b(of)g(am)n(biguit)n(y)g(regarding)g(tok)
2606 n(en)g(returned)164 772 y Fn(A)e(sligh)o(t)f(di\016cult)o(y)g(arises)h
2607 (in)g(rules)g(lik)o(e)292 874 y Fd(return\(yyt)o(ext)o([0])o(\);)164
2608 976 y Fn(and)292 1077 y Fd(return\(con)o(d)23 b(?)i(TOKEN1)e(:)j
2609 (TOKEN2\);)164 1179 y Fn(for)13 b(whic)o(h)g(Ox)f(cannot)i(determine)c
2610 (at)j(ev)m(aluator-generation)h(time)d(whic)o(h)i(tok)o(en)f(will)164
2611 1239 y(b)q(e)k Fd(return)p Fn(ed.)237 1289 y(In)h(the)g(\014rst)h
2612 (case,)f(wherein)f(no)i(declared)e(tok)o(en)h(or)h(c)o(haracter)f
2613 (constan)o(t)g(is)g(rec-)164 1339 y(ognized)j(in)g(the)g
2614 Fd(return)p Fn(ed)e(expression,)j(Ox)f(assumes)g(that)g(the)g(tok)o(en)
2615 g Fd(return)p Fn(ed)164 1389 y(has)d(no)g(attributes,)e(and)i(issues)g
2616 (a)f(w)o(arning)h(lik)o(e:)273 1480 y Fa(ox:)k(scan.l:)f(warning:)h
2617 (line)g(8:)g(ambiguous)f(form)h(of)g(return)g(of)g(token.)317
2618 1530 y(unknown)f(node)h(type--assuming)e(no)i(attributes.)237
2619 1621 y Fn(In)f(the)f(second)h(case,)g(wherein)f(more)f(than)j(one)e
2620 (declared)g(tok)o(en)g(or)h(c)o(haracter)164 1671 y(constan)o(t)g(is)f
2621 (recognized,)g(the)g(no)q(de)h(app)q(ended)g(to)g(the)f(tree)g(during)h
2622 (ev)m(aluation)f(is)164 1721 y(of)c(the)f(t)o(yp)q(e)h(of)g(the)f
2623 (declared)g(tok)o(en)g(or)h(c)o(haracter)f(constan)o(t)h(app)q(earing)h
2624 Fg(leftmost)k Fn(in)164 1771 y(the)c(expression.)21 b(Ox)16
2625 b(issues)g(a)h(w)o(arning)f(lik)o(e:)273 1862 y Fa(ox:)21
2626 b(scan.l:)f(warning:)h(line)g(8:)g(ambiguous)f(form)h(of)g(return)g(of)
2627 g(token.)317 1912 y(multiple)f(tokens)g(in)i(object)e(of)i(return)e
2628 (statement.)164 2013 y Fn(The)k(ab)q(o)o(v)o(e)f(w)o(arnings)h(should)g
2629 (b)q(e)g(tak)o(en)f(seriously)l(,)i(b)q(ecause)f(the)f(conditions)h(of)
2630 164 2074 y(whic)o(h)16 b(they)h(w)o(arn)g(can)g(result)g(in)g(the)f
2631 (generated)h(ev)m(aluator)h(attempting)e(to)h(access)164
2632 2134 y(attribute)h(instances)g(that)h(are)g(nonexisten)o(t)e(or)i(of)g
2633 (the)f(wrong)i(t)o(yp)q(e.)27 b(These)18 b(kinds)164
2634 2194 y(of)g(w)o(arnings)g(are)f(most)g(often)g(seen)g(when)h(\014rst)g
2635 (con)o(v)o(erting)e(an)i(existing)e(Y)l(acc/Lex)164 2254
2636 y(translator)h(to)g(Ox.)237 2314 y(A)12 b(condition)f(causing)h(one)g
2637 (of)h(the)e(ab)q(o)o(v)o(e-describ)q(ed)h(w)o(arnings)g(ma)o(y)e(b)q(e)
2638 i(tolerated)164 2375 y(if)j(the)f(Ox)h(user)g(v)o(eri\014es)f(that)i
2639 (for)f(the)g(rule)g(\(i.e.,)e(ob)s(ject)h(of)i(the)f
2640 Fd(return)e Fn(statemen)o(t\))164 2435 y(in)j(question:)p
2643 15 15 bop 164 162 a Fk(6)49 b(TRANSLA)l(TION)15 b(INTO)h(C)k(CODE)777
2644 b Fn(15)237 307 y Fc(\017)24 b Fn(all)14 b(of)h(the)f(tok)o(ens)g(that)
2645 h(can)f(b)q(e)h Fd(return)p Fn(ed)d(for)j(the)f(rule)g(are)g(con)o
2646 (tained)g(in)g(the)286 367 y(grammar-sym)o(b)q(ol)f(list)j(\(section)g
2647 (3\))g(of)h(a)g(single)e(attribute)h(declaration.)237
2648 467 y Fc(\017)24 b Fn(no)f(tok)o(en)f(that)g(can)h(b)q(e)g
2649 Fd(return)p Fn(ed)c(for)k(the)f(rule)g(app)q(ears)h(in)f(a)h(grammar-)
2650 286 527 y(sym)o(b)q(ol)15 b(list)g(of)i(an)g(attribute)f(declaration.)
2651 164 671 y Fb(5.4)70 b(Cycles)164 763 y Fn(It)18 b(is)g(easy)h(to)f
2652 (write)g(an)h(attribute)f(grammar)f(suc)o(h)h(that)h(some)e(attribute)h
2653 (instance)164 823 y(of)24 b(some)e(parse)i(tree)f(has)h(a)f(c)o(hain)g
2654 (of)h(dep)q(endencies)f(that)g(leads)h(bac)o(k)f(to)g(itself.)164
2655 883 y(Suc)o(h)14 b(a)g(grammar)f(is)h(called)f Fg(cir)n(cular)5
2656 b Fn(,)14 b(and)h(suc)o(h)e(a)i(c)o(hain)f(of)g(dep)q(endencies)f(is)h
2657 (called)164 944 y(a)21 b Fg(cycle)t Fn(.)35 b(F)l(or)20
2658 b(suc)o(h)g(a)h(tree,)f(there)g(is)g(an)h(attribute)f(instance)g(that)h
2659 (the)f(ev)m(aluator)164 1004 y(cannot)g(b)q(egin)f(to)h(solv)o(e)e(un)o
2660 (til)g(that)i(instance)f(has)g(already)g(b)q(een)h(solv)o(ed.)29
2661 b(A)19 b(cycle)164 1064 y(also)k(mak)o(es)e(it)h(imp)q(ossible)f(to)i
2662 (solv)o(e)f(an)o(y)g(attribute)g(instance)g(that)h(has)h(a)e(c)o(hain)
2663 164 1124 y(of)d(dep)q(endencies)f(leading)g(to)i(an)f(instance)f(in)o
2664 (v)o(olv)o(ed)f(in)h(the)h(cycle.)27 b(Circularit)o(y)17
2665 b(is)164 1184 y(usually)k(not)h(in)o(tended)e(b)o(y)h(the)g(ev)m
2666 (aluator)g(designer.)36 b(A)21 b(general)g(circularit)o(y)e(test)164
2667 1245 y(p)q(erformed)g(at)i(ev)m(aluator-generation)h(time)d(w)o(ould)h
2668 (require)g(exp)q(onen)o(tial)g(running)164 1305 y(time)d(for)j(some)e
2669 (inputs)i([Jaza)o(y)o(eri)14 b(75)q(].)30 b(P)o(olynomial-time)16
2670 b(tests)k(for)f(sp)q(ecial)g(kinds)164 1365 y(of)h(non-circularit)o(y)e
2671 (are)i(kno)o(wn,)g(but)g(the)f(presen)o(t)g(v)o(ersion)g(of)h(Ox)f
2672 (deals)h(with)f(the)164 1425 y(problem)c(b)o(y)g(c)o(hec)o(king)g(for)h
2673 (cycles)f(at)i(ev)m(aluation)f(time.)164 1590 y Fo(6)83
2674 b(T)-7 b(ranslation)27 b(in)n(to)g(C)h(co)r(de)164 1700
2675 y Fn(Ox)18 b(translates)g(attribute)g(declarations)g(in)o(to)f(C)i
2676 (structure)e(declarations,)h(with)g(the)164 1760 y(attribute)e(names)f
2677 (app)q(earing)i(as)g(structure)f(mem)o(b)q(ers.)237 1820
2678 y(The)22 b(ev)m(aluation)h(expression)f(of)h(eac)o(h)e(attribute)h
2679 (de\014nition)g(is)g(copied)g(v)o(erba-)164 1881 y(tim)e(in)o(to)i
2680 (Ox's)g(output,)i(except)d(that)i(attribute)f(references)e(are)j
2681 (translated)f(in)o(to)164 1941 y(paren)o(thesized)15
2682 b(references)g(to)i(C)f(v)m(ariables.)164 2106 y Fo(7)83
2683 b(T)-7 b(emp)r(oral)30 b(b)r(eha)n(vior)g(of)h(Ox-generated)f(ev)-5
2684 b(al-)288 2197 y(uators)164 2322 y Fb(7.1)70 b(Stac)n(k)23
2685 b(op)r(erations)164 2414 y Fn(Inasm)o(uc)o(h)16 b(as)i(an)h(ordinary)f
2686 (Y)l(acc/Lex)f(recognizer)g(emplo)o(ys)f(an)i(LR)g(parsing)h(algo-)164
2687 2474 y(rithm)10 b([Aho)16 b(86],)c(eac)o(h)f(input)g(en)o(tails)g(a)h
2688 (sequence)e(of)i(lo)q(ok)m(aheads,)i(shifts,)e(and)g(reduc-)p
2691 16 16 bop 164 162 a Fk(7)49 b(TEMPORAL)17 b(BEHA)-5 b(VIOR)13
2692 b(OF)j(O)o(X)5 b(-GENERA)l(TED)16 b(EV)-5 b(ALUA)l(TORS)64
2693 b Fn(16)164 307 y(tions,)19 b(and)h(a)f(stac)o(k)g(of)g(parser)h
2694 (states)f(is)g(main)o(tained.)27 b(F)l(rom)18 b(ordinary)h(Y)l(acc/Lex)
2695 164 367 y(source,)k(Ox)f(generates)g(an)h(ev)m(aluator)f(whose)h
2696 Fd(yyparse)d Fn(go)q(es)j(through)g(the)f(same)164 428
2697 y(sequence)e(of)h(lo)q(ok)m(aheads,)i(shifts,)f(and)g(reductions)e(as)i
2698 (do)q(es)g(the)e Fd(yyparse)f Fn(of)i(the)164 488 y(ordinary)16
2699 b(Y)l(acc/Lex)g(recognizer.)237 548 y(The)i(Ox-generated)g(ev)m
2700 (aluator,)g(in)g(building)f(a)i(parse)f(tree,)f(main)o(tains)g(a)h
2701 (stac)o(k)164 608 y(of)h(subtrees.)27 b(The)19 b(op)q(erations)g(on)g
2702 (the)f(stac)o(k)g(of)h(subtrees)f(are)h(sync)o(hronized)e(with)164
2703 668 y(the)j(op)q(erations)h Fd(yyparse)c Fn(p)q(erforms)i(on)h(its)g
2704 (stac)o(k)g(of)g(parser)g(states,)h(except)d(that)164
2705 729 y(op)q(erations)i(in)o(v)o(olving)c(the)j(\\mark)o(er)e(non)o
2706 (terminals")g(\(see)h([Johnson)f(75)q(]\))h(inserted)164
2707 789 y(in)o(to)e(the)g(grammar)f(b)o(y)g(Y)l(acc)h(are)g(ignored.)237
2708 849 y(The)24 b(ev)m(aluator)g(main)o(tains)f(its)g(stac)o(k)h(of)g
2709 (subtrees)g(as)g(follo)o(ws.)44 b(Lo)q(ok)m(aheads)164
2710 909 y(coincide)22 b(with)g(calls)h(to)g Fd(yylex)p Fn(.)39
2711 b(Just)23 b(b)q(efore)g(a)g Fd(return)e Fn(is)i(executed)e(in)i(a)g
2712 (Lex)164 969 y(action,)15 b(an)g(image)e(of)i(a)g(leaf)f(no)q(de)i(is)e
2713 (created)g(in)g(the)h(ev)m(aluator's)g Fg(lo)n(okahe)n(ad)h(bu\013er)5
2714 b Fn(,)164 1029 y(and)18 b(its)e(syn)o(thesized)g(attribute)h
2715 (instances)g(are)g(solv)o(ed)g(and)g(placed)g(in)g(that)g(bu\013er.)164
2716 1090 y(A)o(t)e(eac)o(h)h(shift,)g(a)h(leaf)e(no)q(de)i(is)f(created)g
2717 (from)f(the)h(image)f(in)h(the)g(lo)q(ok)m(ahead)i(bu\013er,)164
2718 1150 y(and)j(the)g(subtree)f(consisting)h(of)g(that)g(leaf)g(no)q(de)g
2719 (is)g(pushed)g(on)o(to)g(the)f(stac)o(k.)35 b(A)o(t)164
2720 1210 y(eac)o(h)17 b(reduction,)g(zero)g(or)h(more)f(subtrees)g(are)h(p)
2721 q(opp)q(ed)g(from)f(the)g(stac)o(k,)g(and)i(their)164
2722 1270 y(ro)q(ots)g(b)q(ecome)e(the)h(c)o(hildren)e(of)j(a)f
2723 (newly-created)f(no)q(de,)i(yielding)e(a)h(new)h(subtree.)164
2724 1330 y(The)c(ro)q(ot)g(of)g(the)g(new)f(subtree)h(is)f(giv)o(en)g(a)h
2725 (lab)q(el)f(to)h(indicate)f(the)g(pro)q(duction)i(b)q(eing)164
2726 1391 y(applied)21 b(at)i(the)e(no)q(de,)j(and)e(the)g(new)g(subtree)g
2727 (is)g(pushed)g(on)o(to)g(the)g(stac)o(k.)38 b(The)164
2728 1451 y(parse)22 b(tree)f(is)g(completed)e(up)q(on)k(end)e(of)h(input)f
2729 (together)h(with)f(reduction)g(to)h(the)164 1511 y(start)17
2730 b(sym)o(b)q(ol.)164 1655 y Fb(7.2)70 b(Placemen)n(t)20
2731 b(of)j(generated)g(co)r(de)164 1748 y Fn(Co)q(de)18 b(for)g(parse-tree)
2732 g(managemen)o(t)d(and)k(attribute)e(ev)m(aluation)h(is)f(placed)g(in)h
2733 (Y)l(acc)164 1808 y(and)e(Lex)g(actions)g(in)g(Ox's)f(output.)22
2734 b(If)15 b(a)i(giv)o(en)d(rule)i(in)f(the)h(Y-\014le)f(has)h(an)h
2735 (ordinary)164 1868 y(Y)l(acc)c(action,)h(the)f(Ox-generated)h(co)q(de)g
2736 (is)f(placed)g Fg(after)20 b Fn(an)o(y)13 b(programmer-supplied)164
2737 1928 y(C)21 b(co)q(de)g(con)o(tained)g(in)g(the)f(action.)36
2738 b(If)21 b(a)g(giv)o(en)f(rule)g(in)h(the)g(Y-\014le)f(lac)o(ks)g(a)i(Y)
2739 l(acc)164 1989 y(action,)15 b(an)h(action)f(is)g(created,)g(and)h(the)f
2740 (Ox-generated)g(co)q(de)h(is)f(placed)g(there.)20 b(The)164
2741 2049 y(actions)c(so)g(created)f(are)g(in)o(tro)q(duced)g(only)h(at)f
2742 (the)h Fg(ends)k Fn(of)c(rules,)e(so)i(Y)l(acc)f(do)q(es)h(not)164
2743 2109 y(create)d(a)g(mark)o(er)f(non)o(terminal)f(for)j(the)f(action,)g
2744 (and)h(the)f(LALR\(1\))h(prop)q(ert)o(y)g(of)f(the)164
2745 2169 y(grammar)i(is)h(una\013ected.)237 2229 y(When)j(an)g(attribute)g
2746 (reference)e(section)i(in)g(an)g(L-\014le)g(con)o(tains)g
2747 (de\014nitions)g(for)164 2290 y(more)14 b(than)i(one)g(attribute)f(o)q
2748 (ccurrence,)f(co)q(de)i(for)f(impleme)o(n)o(ti)o(ng)e(those)j
2749 (de\014nitions)164 2350 y(is)e(executed)f(in)i(the)f(same)f(order)i(in)
2750 f(whic)o(h)g(the)g(de\014nitions)g(app)q(ear)i(in)e(that)h(section.)237
2751 2410 y(F)l(or)27 b(the)f(attribute)g(o)q(ccurrences)g(de\014ned)g(in)g
2752 (the)g(Y-\014le,)i(Ox)e(and)h(the)f(Ox-)164 2470 y(generated)14
2753 b(ev)m(aluator)h(p)q(erform)e(analyses)h(to)h(determine)c(when)k(to)f
2754 (execute)f(the)h(co)q(de)p eop
2756 17 17 bop 164 162 a Fk(8)49 b(PR)o(OGRAMMING)15 b(STYLE)920
2757 b Fn(17)164 307 y(segmen)o(t)13 b(that)i(ev)m(aluates)g(a)h(giv)o(en)e
2758 (attribute.)20 b(The)15 b(order)g(of)g(execution)f(of)h(the)g(co)q(de)
2759 164 367 y(segmen)o(ts)c(asso)q(ciated)j(with)f(the)f(de\014nitions)h
2760 (in)f(a)i(giv)o(en)e(attribute)g(reference)f(section)164
2761 428 y(is)18 b(determined)e(b)o(y)i(the)g(dep)q(endencies)f(of)h(the)g
2762 (de\014nitions,)g(and)h(is)f(not)h(necessarily)164 488
2763 y(related)d(to)g(the)g(order)h(of)f(app)q(earance)h(of)g(the)f
2764 (de\014nitions.)237 548 y(Some)i(attribute)h(o)q(ccurrences,)g(for)g
2765 (example)e(those)i(that)h(ha)o(v)o(e)e(no)i(dep)q(endees,)164
2766 608 y(are)i(ev)m(aluated)h(as)g(part)g(of)f(the)h(Y)l(acc)e(action)i
2767 (executed)e(up)q(on)i(reduction)f(b)o(y)g(the)164 668
2768 y(asso)q(ciated)14 b(pro)q(duction.)21 b(De\014nitions)14
2769 b(of)f(suc)o(h)g(o)q(ccurrences)g(are)h(allo)o(w)o(ed)e(to)i(con)o
2770 (tain)164 729 y(references)f(to)i(the)f(Y)l(acc)g(pseudo)o(v)m
2771 (ariables)h Fd($$)p Fn(,)f Fd($1)p Fn(,)f Fd($2)p Fn(,)h(etc.)20
2772 b(If)14 b(Ox)g(determines)e(that)164 789 y(a)k(giv)o(en)f(attribute)g
2773 (o)q(ccurrence)g(cannot)i(b)q(e)f(ev)m(aluated)f(at)h(reduction)g
2774 (time,)d(and)j(the)164 849 y(de\014nition)g(refers)f(to)i(suc)o(h)f(a)h
2775 (pseudo)o(v)m(ariable,)e(Ox)h(issues)h(an)f(error)h(message.)164
2776 993 y Fb(7.3)70 b(Decoration)22 b(and)h(the)g(ready)g(set)164
2777 1086 y Fn(The)18 b(Ox-generated)h(ev)m(aluator)g(main)o(tains)e(a)h
2778 (set)h(of)g(attribute)f(instances)g(that)h(are)164 1146
2779 y(ready)i(to)g(b)q(e)g(solv)o(ed,)g(i.e.,)e(those)j(whose)f(ev)o(ery)e
2780 (dep)q(endee)i(has)g(b)q(een)g(solv)o(ed,)g(but)164 1206
2781 y(whic)o(h)e(ha)o(v)o(e)h(not)g(themselv)o(es)d(b)q(een)j(solv)o(ed.)33
2782 b(During)20 b(parsing)h(of)f(the)g(input,)g(it)g(is)164
2783 1266 y(p)q(ossible)12 b(to)g(remo)o(v)o(e)d(an)j(attribute)f(instance)g
2784 (from)g(this)g Fg(r)n(e)n(ady)h(set)5 b Fn(,)12 b(solv)o(e)f(it,)h(and)
2785 g(then)164 1326 y(c)o(hec)o(k)j(whether)h(the)g(solving)g(of)h(that)g
2786 (instance)f(has)h(caused)g(an)o(y)f(of)h(its)f(dep)q(enden)o(ts)164
2787 1387 y(to)e(b)q(e)g(ready)g(to)g(b)q(e)g(solv)o(ed.)20
2788 b(Instances)14 b(that)g(are)g(th)o(us)g(made)e(ready)i(are)g(then)f
2789 (placed)164 1447 y(in)23 b(the)h(ready)f(set.)44 b(Rep)q(eating)23
2790 b(this)h(pro)q(cess)g(un)o(til)f(the)g(ready)h(set)f(is)h(empt)o(y)d
2791 (is)164 1507 y(kno)o(wn)f(as)h Fg(de)n(c)n(or)n(ation)t
2792 Fn(.)33 b(F)l(ollo)o(wing)20 b(a)g(decoration,)h(further)f(parsing)h
2793 (of)g(the)f(input)164 1567 y(ma)o(y)12 b(result)g(in)h(creation)g(of)g
2794 (parse-tree)g(no)q(des)h(and)g(insertion)f(of)g(attribute)g(instances)
2795 164 1627 y(in)o(to)j(the)h(ready)g(set.)23 b(Sc)o(heduling)16
2796 b(of)h(decorations)g(is)g(p)q(erformed)e(automatically)g(b)o(y)164
2797 1688 y(the)k(ev)m(aluator.)30 b(Ev)m(aluation)20 b(of)f(a)h(giv)o(en)e
2798 (syn)o(tactically-correct)f(input)i(in)o(v)o(olv)o(es)e(at)164
2799 1748 y(least)k(one)g(decoration,)i(that)e(p)q(erformed)f(after)i(the)f
2800 (\014nal)g(reduction)g(to)g(the)g(start)164 1808 y(sym)o(b)q(ol.)164
2801 1974 y Fo(8)83 b(Programming)28 b(st)n(yle)164 2084 y
2802 Fn(De\014nitions)16 b(of)h Fg(attribute)h(gr)n(ammar)5
2803 b Fn(,)15 b(\(for)h(instance)g(those)h(in)f([Lorho)h(88)q(])e(and)164
2804 2144 y([W)l(aite)g(84)q(]\))22 b(emplo)o(y)d(no)k(notion)f(of)g
2805 (execution)43 b(sequence.)37 b(The)22 b(usual)h(Ox)e(pro-)164
2806 2204 y(gramming)13 b(st)o(yle)h(in)o(v)o(olv)o(es)f(de\014ning)i(syn)o
2807 (thesized)f(attribute)g(o)q(ccurrences)h(of)g(tok)o(ens)164
2808 2264 y(in)g(terms)f(of)i Fd(yytext)d Fn(and)j Fd(yyleng)e
2809 Fn(and)i(other)g(suc)o(h)f(data)h(structures)g(of)f(the)h(lexical)164
2810 2325 y(analyzer.)21 b(Then)16 b(the)f(attribute)h(de\014nitions)g(of)g
2811 (eac)o(h)f(pro)q(duction)i(are)f(written)f(only)164 2385
2812 y(in)e(terms)e(of)i(constan)o(ts)h(and)f(other)g(attribute)g(o)q
2813 (ccurrences)f(of)i(that)f(pro)q(duction.)21 b(F)l(or)164
2814 2445 y(a)15 b(giv)o(en)e(sen)o(tence,)h(the)g(syn)o(thesized)f
2815 (attribute)h(instances)g(of)h(the)f(tok)o(ens)h(then)f(com-)p
2818 18 18 bop 164 162 a Fk(9)49 b(POSTDECORA)l(TION)16 b(TRA)-5
2819 b(VERSALS)678 b Fn(18)164 307 y(pletely)14 b(determine)g(the)h(v)m
2820 (alues)h(of)h(all)e(attribute)h(instances)g(of)g(the)g(parse)g(tree.)21
2821 b(The)164 367 y(attribute)14 b(instances)g(of)g(the)g(ro)q(ot)h(no)q
2822 (de)f(are)g(often)g(of)h(particular)e(in)o(terest,)g(and)i(their)164
2823 428 y(de\014nitions)i(often)g(con)o(tain)g(co)q(de)g(that)h(copies)f
2824 (their)f(v)m(alues)h(to)h(global)f(C)g(v)m(ariables,)164
2825 488 y(so)g(that)g(they)e(ma)o(y)g(b)q(e)h(used)h(in)f(co)q(de)g
2826 (executed)f(after)h(the)g(return)g(from)f Fd(yyparse)p
2827 Fn(.)237 548 y(Since)j(attribute)h(de\014nitions)f(in)h(Ox)f(co)q(de)h
2828 (ma)o(y)f(con)o(tain)g(an)o(y)h(C)g(co)q(de,)h(the)e(Ox)164
2829 608 y(programmer)f(ma)o(y)h(deviate)g(from)g(the)h(safe)g(approac)o(h)h
2830 (describ)q(ed)f(ab)q(o)o(v)o(e)g(b)o(y)g(using)164 668
2831 y(non-ro)q(ot)25 b(attribute)e(de\014nitions)h(that)f(read)h(or)g
2832 (write)e(global)i(v)m(ariables.)43 b(Before)164 729 y(attempting)17
2833 b(the)i(use)g(of)f(side)h(e\013ects,)f(the)h(programmer)d(should)k(b)q
2834 (e)e(familiar)f(with)164 789 y(the)f(material)e(of)j(section)f(7.)237
2835 849 y(Since)e(the)h(order)g(of)g(ev)m(aluation)g(of)g(attributes)g(b)o
2836 (y)f(the)h(Ox-generated)f(ev)m(aluator)164 909 y(is)d(not)g(explicit)e
2837 (in)i(the)g(Ox)g(input)g(sp)q(eci\014cations,)g(usually)g(it)g(is)g
2838 (not)g(con)o(v)o(enien)o(t)e(to)j(use)164 969 y(attribute)k
2839 (de\014nitions)g(for)g(order-sensitiv)o(e)f(side)h(e\013ects)g(suc)o(h)
2840 g(as)33 b(co)q(de)16 b(generation.)237 1029 y(A)22 b(common)e(general)i
2841 (approac)o(h)h(to)g(translation)f(is)g(to)h(build)f(and)g(decorate)h(a)
2842 164 1090 y(parse)e(tree)f(\(mean)o(while)d(p)q(erforming)j(some)f(of)i
2843 (the)f(c)o(hec)o(ks)f(for)i(seman)o(tic)d(errors\),)164
2844 1150 y(and)24 b(to)f(then)g(mak)o(e)e(one)i(or)g(more)f
2845 (determinate-order)f(tree)h(tra)o(v)o(ersals)h(for)g(\014nal)164
2846 1210 y(error)16 b(c)o(hec)o(ks,)e(gathering)j(of)g(compilation)d
2847 (statistics,)i(co)q(de)g(generation,)g(etc.)237 1270
2848 y(Ox)g(has)h(a)f(facilit)o(y)e(for)j(sp)q(eci\014cation)f(of)g(suc)o(h)
2849 g(tra)o(v)o(ersals,)f(and)i(this)e(is)h(the)g(topic)164
2850 1330 y(of)h(section)e(9.)164 1497 y Fo(9)83 b(P)n(ostdecoration)27
2851 b(tra)n(v)n(ersals)164 1606 y Fn(The)15 b(idea)g(of)h(decoration)f(w)o
2852 (as)h(describ)q(ed)f(in)g(section)f(7.3.)22 b Fg(Postde)n(c)n(or)n
2853 (ation)c Fn(refers)d(to)164 1667 y(an)o(y)f(time)e(after)j(the)f
2854 Fg(\014nal)21 b Fn(decoration)14 b(of)h(the)f(parse)h(tree,)e(whic)o(h)
2855 h(follo)o(ws)g(parsing)i(of)164 1727 y(a)d(correct)g(input.)20
2856 b(This)13 b(section)g(sho)o(ws)h(ho)o(w)f(the)g(Ox)g(user)g(can)g
2857 (cause)g Fg(p)n(ostde)n(c)n(or)n(ation)164 1787 y(tr)n(aversals)t
2858 Fn(,)42 b(eac)o(h)20 b(of)g(whic)o(h)g(p)q(ermits)f(access)h(\(in)g(a)g
2859 (user-sp)q(eci\014ed)g(order\))h(to)f(the)164 1847 y(tree's)15
2860 b(attribute)h(instances.)164 1992 y Fb(9.1)70 b(Example:)29
2861 b(in\014x)23 b(to)g(pre\014x)g(translation)164 2084 y
2862 Fn(The)15 b(problem)e(of)j(parsing)f(in\014x)g(arithmetic)d
2863 (expressions,)j(and)h(their)e(translation)i(to)164 2144
2864 y(pre\014x)g(form)f(serv)o(es)g(to)i(in)o(tro)q(duce)f(Ox's)g(p)q
2865 (ostdecoration)h(tra)o(v)o(ersal)e(facilit)o(y)l(.)237
2866 2204 y(The)j(tok)o(ens)g(of)g(the)g(example)e(language)j(are)f
2867 (determined)d(b)o(y)j(the)f(follo)o(wing)h(L-)164 2264
2870 19 19 bop 164 162 a Fk(9)49 b(POSTDECORA)l(TION)16 b(TRA)-5
2871 b(VERSALS)678 b Fn(19)164 357 y Fa(\045{)164 407 y(#include)20
2872 b("y.tab.h")164 457 y(#include)g("oxout.h")164 506 y(\045})164
2873 606 y(\045\045)164 656 y([)i(\\n\\t\\f]*)85 b(;)164 706
2874 y([0-9]+)173 b(return\(CONST\);)19 b(@{)i(sscanf\(yytext,"\045d",)o
2875 (&@CON)o(ST.va)o(l@\);)d(@})164 756 y(\\\()261 b(return\('\('\);)164
2876 805 y(\\\))g(return\('\)'\);)164 855 y(\\+)g(return\('+'\);)164
2877 905 y(\\*)g(return\('*'\);)164 955 y(.)283 b(fprintf\(stderr,"il)o
2878 (legal)18 b(character\\n"\);)164 1005 y(\045\045)237
2879 1169 y Fn(The)e(follo)o(wing)g(Y-\014le)g(completes)e(the)i(sp)q
2880 (eci\014cation)g(of)g(the)g(ev)m(aluator.)p eop
2882 20 20 bop 164 162 a Fk(9)49 b(POSTDECORA)l(TION)16 b(TRA)-5
2883 b(VERSALS)678 b Fn(20)164 357 y Fa(\045token)21 b(CONST)164
2884 407 y(\045left)g('+')164 457 y(\045left)g('*')164 556
2885 y(@attributes)e({int)i(val;})g(CONST)164 606 y(@traversal)f
2886 (@lefttoright)f(@preorder)h(LRpre)164 706 y(\045{)164
2887 756 y(#include)g("oxout.h")164 805 y(#include)g(<stdio.h>)164
2888 855 y(\045})164 955 y(\045\045)164 1005 y(expr)86 b(:)153
2889 b(expr)86 b('*')108 b(expr)544 b(/*)22 b(rule)f(1)g(*/)513
2890 1054 y(@{)g(@LRpre)42 b(printf\(")21 b(*)g("\);)g(@})338
2891 1154 y(|)153 b(expr)86 b('+')108 b(expr)544 b(/*)22 b(rule)f(2)g(*/)513
2892 1204 y(@{)g(@LRpre)42 b(printf\(")21 b(+)g("\);)g(@})338
2893 1303 y(|)153 b('\(')108 b(expr)86 b('\)')566 b(/*)22
2894 b(rule)f(3)g(*/)338 1403 y(|)153 b(CONST)870 b(/*)22
2895 b(rule)f(4)g(*/)513 1453 y(@{)g(@LRpre)42 b(printf\(")21
2896 b(\045d)g(",@CONST.val@\);)e(@})338 1503 y(;)164 1553
2897 y(\045\045)164 1702 y(main\(\))208 1752 y({yyparse\(\);)229
2898 1802 y(printf\("\\n"\);)208 1851 y(})237 2015 y Fn(The)25
2899 b(sequence:)38 b Fd(@traversal)22 b(@lefttorigh)o(t)h(@preorder)f
2900 (LRpre)h Fn(sp)q(eci\014es)164 2076 y(that)18 b(a)g(left-to-righ)o(t)f
2901 (preorder)g(tra)o(v)o(ersal)g(of)h(the)f(parse)h(tree)f(b)q(e)h(p)q
2902 (erformed)e(b)o(y)h(the)164 2136 y(ev)m(aluator)j(after)g(the)g
2903 (\014nal)f(decoration,)i(and)f(that)h(the)e(tra)o(v)o(ersal)g(b)q(e)h
2904 (iden)o(ti\014ed)e(as)164 2196 y Fd(LRpre)p Fn(.)25 b(Note)18
2905 b(that)h Fd(LRpre)d Fn(is)i(programmer-de\014ned,)e(and)j(is)f
2906 Fg(not)24 b Fn(an)18 b(Ox)g(reserv)o(ed)164 2256 y(w)o(ord.)237
2907 2316 y(Eac)o(h)h(attribute)g(reference)e(section)i(in)f(the)h(ab)q(o)o
2908 (v)o(e)g(Y-\014le)f(con)o(tains)h(a)g Fg(tr)n(aversal)164
2909 2377 y(action)e(sp)n(e)n(ci\014er)k Fn(starting)15 b(with)g(the)g
2910 Fg(tr)n(aversal)h(mo)n(de)g(annunciator)22 b Fd(@LRpre)p
2911 Fn(,)13 b(whic)o(h)164 2437 y(is)j(de\014ned)g(in)g(the)g(ab)q(o)o(v)o
2912 (e-men)o(tioned)e Fd(@traversal)f Fn(sp)q(eci\014cation.)p
2915 21 21 bop 164 162 a Fk(9)49 b(POSTDECORA)l(TION)16 b(TRA)-5
2916 b(VERSALS)678 b Fn(21)237 307 y(When)24 b(the)g Fd(LRpre)e
2917 Fn(tra)o(v)o(ersal)h(reac)o(hes)h(a)g(no)q(de)h(at)f(whic)o(h)f(rule)h
2918 (1)g(is)g(applied,)164 367 y(an)f(asterisk)f(is)g(prin)o(ted,)h(then)f
2919 (eac)o(h)g(subtree)g(ro)q(oted)i(at)e(a)h(c)o(hild)e(of)i(the)f(no)q
2920 (de)h(is)164 428 y(tra)o(v)o(ersed,)14 b(the)h(leftmost)f(subtree)i
2921 (\014rst.)21 b(The)15 b(b)q(eha)o(vior)h(of)g(the)f(tra)o(v)o(ersal)g
2922 (at)g(a)h(no)q(de)164 488 y(at)22 b(whic)o(h)g(rule)f(2)h(is)g(applied)
2923 g(is)f(the)h(same,)g(except)f(that)h(a)h(plus)f(sign)g(is)g(prin)o(ted)
2924 164 548 y(instead)d(of)g(an)g(asterisk.)29 b(When)18
2925 b Fd(LRpre)f Fn(reac)o(hes)h(a)i(no)q(de)f(for)g(rule)f(3,)h(no)h(tra)o
2926 (v)o(ersal)164 608 y(action)15 b(is)f(p)q(erformed,)g(but)h(the)f(c)o
2927 (hildren)f(of)i(the)g(no)q(de)g(are)g(tra)o(v)o(ersed)f(recursiv)o(ely)
2928 e(as)164 668 y(describ)q(ed)k(ab)q(o)o(v)o(e)g(for)g(no)q(des)h(for)g
2929 (rules)f(1)g(and)h(2.)22 b(The)16 b Fd(val)f Fn(attribute)h(of)h(the)f
2930 Fd(CONST)164 729 y Fn(c)o(hild)i(is)h(prin)o(ted)f(when)i(a)g(no)q(de)g
2931 (for)f(rule)g(4)h(is)f(reac)o(hed.)29 b(No)20 b(action)f(is)g(p)q
2932 (erformed)164 789 y(during)d(a)h(tra)o(v)o(ersal)f(of)g(a)h(subtree)f
2933 (that)g(consists)h(of)g(a)f(terminal)e(no)q(de.)164 933
2934 y Fb(9.2)70 b(General)22 b(description)164 1025 y Fj(9.2.1)55
2935 b(T)-5 b(ra)n(v)n(ersal)19 b(sp)r(eci\014cations)164
2936 1118 y Fn(The)f(Ox)f(programmer)g(ma)o(y)f(place)h(in)h(the)f
2937 (declarations)h(section)g(\(the)f(part)i(b)q(efore)164
2938 1178 y(the)f(\014rst)g Fd(\045\045)f Fn(mark\))f(of)j(the)e(Y-\014le)g
2939 (one)h(or)g(more)f Fg(tr)n(aversal)i(sp)n(e)n(ci\014c)n(ations)t
2940 Fn(.)26 b(Suc)o(h)18 b(a)164 1238 y(sp)q(eci\014cation)d(consists)g(of)
2941 g(the)g(reserv)o(ed)e(w)o(ord)i Fd(@traversal)p Fn(,)c(follo)o(w)o(ed)j
2942 (b)o(y)h(a)g Fg(tr)n(aver-)164 1298 y(sal)i(sp)n(e)n(ci\014er)f(se)n
2943 (quenc)n(e)21 b Fn(and)16 b(a)f(non-empt)o(y)f(sequence)g(of)i(iden)o
2944 (ti\014ers,)d(the)i(iden)o(ti\014ers)164 1359 y(b)q(eing)k(separated)h
2945 (b)o(y)e(whitespace.)29 b(A)18 b(tra)o(v)o(ersal)h(sp)q(eci\014er)f
2946 (sequence)g(ma)o(y)f(con)o(tain)164 1419 y(the)f(follo)o(wing)g
2947 Fg(tr)n(aversal)h(sp)n(e)n(ci\014ers)j Fn(\(in)c(an)o(y)g(order\):)237
2948 1521 y Fc(\017)24 b Fn(at)17 b(most)e(one)h(of:)22 b
2949 Fd(@postorder)o Fn(,)13 b Fd(@preorder)237 1622 y Fc(\017)24
2950 b Fn(at)17 b(most)e(one)h(of:)22 b Fd(@lefttorig)o(ht)p
2951 Fn(,)12 b Fd(@righttolef)o(t)237 1724 y Fc(\017)24 b
2952 Fn(optionally:)d Fd(@disable)164 1826 y Fn(If)15 b(neither)g
2953 Fd(@postorder)d Fn(nor)k Fd(@preorder)c Fn(app)q(ears)17
2954 b(in)f(the)f(sequence,)f(the)i(tra)o(v)o(ersal)164 1886
2955 y(is)g(p)q(ostorder)h(b)o(y)e(default.)21 b(A)16 b(left-to-righ)o(t)f
2956 (tra)o(v)o(ersal)g(is)h(sp)q(eci\014ed)g(b)o(y)f(default)h(when)164
2957 1946 y(neither)f Fd(@lefttorigh)o(t)e Fn(nor)k Fd(@righttole)o(ft)c
2958 Fn(app)q(ears.)237 2006 y(F)l(ollo)o(wing)19 b(the)g(\014nal)h
2959 (decoration,)g(the)f(parse)g(tree)g(is)g(tra)o(v)o(ersed)g(once)g(for)g
2960 (eac)o(h)164 2066 y(tra)o(v)o(ersal)g(sp)q(eci\014cation.)32
2961 b(The)20 b(order)g(of)g(p)q(erforming)f(the)g(tra)o(v)o(ersals)h
2962 (corresp)q(onds)164 2127 y(to)j(the)f(order)h(of)g(app)q(earance)g(of)g
2963 (the)f(tra)o(v)o(ersal)g(sp)q(eci\014cations.)40 b(The)23
2964 b Fd(@disable)164 2187 y Fn(reserv)o(ed)15 b(w)o(ord)i(causes)g(the)f
2965 (generated)g(ev)m(aluator)h(to)g(skip)f(an)o(y)h(tra)o(v)o(ersal)e(in)h
2966 (whose)164 2247 y(sp)q(eci\014cation)g(it)g(app)q(ears,)h(whic)o(h)e
2967 (ma)o(y)g(b)q(e)h(useful)g(for)h(debugging.)237 2307
2968 y(The)f(co)q(de)h(fragmen)o(t:)292 2409 y Fd(@traversal)22
2969 b(@preorder)g(LRpre)292 2469 y(@traversal)g(LRpost)p
2972 22 22 bop 164 162 a Fk(9)49 b(POSTDECORA)l(TION)16 b(TRA)-5
2973 b(VERSALS)678 b Fn(22)164 307 y(app)q(earing)14 b(in)e(the)h
2974 (declarations)g(section)f(sp)q(eci\014es)g(that,)i(after)f(the)f
2975 (\014nal)h(decoration,)164 367 y(the)g(generated)g(ev)m(aluator)g(is)g
2976 (to)h(p)q(erform)e(a)h(left-to-righ)o(t)g(preorder)g(tra)o(v)o(ersal)f
2977 (named)164 428 y Fd(LRpre)p Fn(,)i(follo)o(w)o(ed)h(b)o(y)h(a)h
2978 (left-to-righ)o(t)e(p)q(ostorder)j(tra)o(v)o(ersal)d(named)g
2979 Fd(LRpost)p Fn(.)164 557 y Fj(9.2.2)55 b(T)-5 b(ra)n(v)n(ersal)19
2980 b(action)f(sp)r(eci\014cations)164 650 y Fn(In)e(addition)g(to)g
2981 (attribute)g(de\014nitions)g(\(section)f(5.2\),)h(the)g(attribute)g
2982 (reference)e(sec-)164 710 y(tions)j(of)g(the)f(Y-\014le)f(ma)o(y)g(con)
2983 o(tain)i Fg(tr)n(aversal)g(action)i(sp)n(e)n(ci\014c)n(ations)t
2984 Fn(.)j(Eac)o(h)16 b(of)h(these)164 770 y(consists)f(of)g(a)g
2985 Fg(tr)n(aversal)g(mo)n(de)g(annunciator)5 b Fn(,)17 b(follo)o(w)o(ed)e
2986 (b)o(y)g(a)h(sequence)e(of)i Fg(dynamic)164 830 y(tr)n(aversal)h(mo)n
2987 (di\014ers)36 b Fn(and)17 b(a)g Fg(tr)n(aversal)g(action)t
2988 Fn(.)22 b(A)16 b(tra)o(v)o(ersal)f(mo)q(de)g(ann)o(unciator)i(is)164
2989 891 y Fd(@)f Fn(follo)o(w)o(ed)f(immedi)o(ately)e(b)o(y)j(the)g(name)f
2990 (of)h(a)h(previously-declared)e(tra)o(v)o(ersal.)237
2991 940 y(Supp)q(ose)j(tra)o(v)o(ersal)e(sp)q(eci\014cations)h(of)g
2992 Fd(LRpre)e Fn(and)j Fd(LRpost)d Fn(as)i(ab)q(o)o(v)o(e.)23
2993 b(Then)17 b(in)164 990 y(the)f(co)q(de)g(fragmen)o(t:)273
2994 1082 y Fa(s)87 b(:)109 b(expr)513 1131 y(@{)21 b(@LRpost)f
2995 (printf\("\\n"\);)521 b(/*)21 b(1)h(*/)578 1181 y(@LRpost)e(@revorder)g
2996 (\(1\))h(printf\("postfix:)41 b("\);)i(/*)21 b(2)h(*/)578
2997 1231 y(@LRpre)42 b(@revorder)20 b(\(1\))h(printf\("\\n"\);)216
2998 b(/*)21 b(3)h(*/)578 1281 y(@LRpre)42 b(printf\("prefix:)63
2999 b("\);)348 b(/*)21 b(4)h(*/)513 1331 y(@})382 1380 y(;)164
3000 1482 y Fn(the)14 b(attribute)h(reference)e(section)h(has)h(four)g(tra)o
3001 (v)o(ersal)f(action)h(sp)q(eci\014cations)f(and)h(no)164
3002 1542 y(attribute)20 b(de\014nitions.)34 b(Eac)o(h)20
3003 b(sp)q(eci\014cation)h(is)f(announced)h(b)o(y)f(either)f
3004 Fd(@LRpre)g Fn(or)164 1602 y Fd(@LRpost)p Fn(.)f(Eac)o(h)e(of)f(the)g
3005 Fd(printf)e Fn(statemen)o(ts)h(constitutes)h(a)h(tra)o(v)o(ersal)e
3006 (action.)21 b(The)164 1663 y(form)c(of)i(a)f(tra)o(v)o(ersal)g(action)g
3007 (is)g(that)h(of)f(a)h(C)f(co)q(de)h(fragmen)o(t,)e(except)g(that)i(it)e
3008 (ma)o(y)164 1723 y(con)o(tain)f(references)f(to)h(the)g(attribute)g(o)q
3009 (ccurrences)g(of)h(the)f(asso)q(ciated)h(rule.)237 1783
3010 y(The)j(second)f(and)h(third)g(sp)q(eci\014cations)f(eac)o(h)g(ha)o(v)o
3011 (e)g Fd(@revorder)j(\(1\))d Fn(as)h(a)g(dy-)164 1843
3012 y(namic)15 b(tra)o(v)o(ersal)i(mo)q(di\014er.)22 b(A)16
3013 b(dynamic)g(tra)o(v)o(ersal)g(mo)q(di\014er)f(is)i(either)f
3014 Fd(@revorder)164 1903 y Fn(or)24 b Fd(@revdirect)o(ion)o
3015 Fn(,)f(follo)o(w)o(ed)g(b)o(y)g(a)h(paren)o(thesized)f(expression)g
3016 (that)i(conforms)164 1964 y(to)e(C)f(syn)o(tax,)h(except)e(that)i(it)f
3017 (ma)o(y)e(refer)i(to)h(the)f(rule's)f(attribute)h(o)q(ccurrences.)164
3018 2024 y Fd(@revorder)e Fn(and)25 b Fd(@revdirec)o(tio)o(n)c
3019 Fn(ma)o(y)h(eac)o(h)h(o)q(ccur)h(at)g(most)f(once)g(in)h(a)g(giv)o(en)
3020 164 2084 y(tra)o(v)o(ersal)e(action)h(sp)q(eci\014cation.)40
3021 b(If)23 b Fd(@revdirec)o(tio)o(n)d Fn(app)q(ears)k(in)e(t)o(w)o(o)h
3022 (tra)o(v)o(ersal)164 2144 y(action)15 b(sp)q(eci\014cations)g(within)f
3023 (a)h(giv)o(en)f(attribute)g(reference)f(section,)h(the)h(t)o(w)o(o)g
3024 (sp)q(ec-)164 2204 y(i\014cations)25 b(m)o(ust)f(ha)o(v)o(e)g
3025 (di\013eren)o(t)g(ann)o(unciators.)48 b(Dynamic)24 b(tra)o(v)o(ersal)g
3026 (mo)q(di\014ers)164 2265 y(are)e(used)h(to)f(o)o(v)o(erride)f(the)h
3027 (tra)o(v)o(ersal)f(sp)q(eci\014cations)i(of)f(a)h(giv)o(en)e(tra)o(v)o
3028 (ersal)h(when)164 2325 y(it)13 b(reac)o(hes)g(a)h(giv)o(en)f(kind)g(of)
3029 h(no)q(de.)21 b(The)13 b(mo)q(di\014er)g Fd(@revorder)d
3030 Fg(expr)19 b Fn(means)13 b(roughly)164 2385 y(\\rev)o(erse)i(order)i
3031 Fd(if)e Fg(expr)5 b Fn(".)23 b(When)16 b(the)g Fd(LRpre)e
3032 Fn(tra)o(v)o(ersal)i(reac)o(hes)f(a)i(no)q(de)g(at)g(whic)o(h)164
3033 2445 y(the)f(rule)g Fd(s)26 b(:)51 b(expr)15 b Fn(is)h(applied,)g(the)h
3034 (expression)f Fd(\(1\))g Fn(is)g(ev)m(aluated,)g(and)i(b)q(ecause)p
3037 23 23 bop 164 162 a Fk(10)50 b(O)o(X)20 b(MA)o(CR)o(OS)1162
3038 b Fn(23)164 307 y(it)16 b(is)g(nonzero,)g(the)g(third)f(tra)o(v)o
3039 (ersal)h(action,)f(whic)o(h)h(prin)o(ts)g(a)g(line)f(feed,)g(is)h
3040 (executed)164 367 y(as)e(if)f Fd(LRpre)e Fn(w)o(ere)i(a)g(p)q(ostorder)
3041 i(tra)o(v)o(ersal,)d(i.e.,)g Fg(after)19 b Fn(the)13
3042 b(recursiv)o(e)e(tra)o(v)o(ersal)i(of)g(the)164 428 y(subtree)k(ro)q
3043 (oted)i(at)f(the)g(no)q(de's)g(sole)f(c)o(hild.)25 b(The)17
3044 b(execution)g(of)h(the)f(fourth)i(tra)o(v)o(er-)164 488
3045 y(sal)e(action,)f Fd(printf\("p)o(ref)o(ix)o(:)48 b("\);)16
3046 b Fn(is)g(not)h(a\013ected)f(b)o(y)g(an)o(y)g(dynamic)f(tra)o(v)o
3047 (ersal)164 548 y(mo)q(di\014er,)k(and)i(o)q(ccurs)f(according)h(to)f
3048 Fd(LRpre)p Fn('s)e(\(static\))i(sp)q(eci\014cation,)g(i.e.)31
3049 b Fg(b)n(efor)n(e)164 608 y Fn(the)16 b(tra)o(v)o(ersal)f(of)i(the)f(c)
3050 o(hild)f(subtree.)237 668 y(When)k(the)g Fd(LRpost)f
3051 Fn(tra)o(v)o(ersal)g(reac)o(hes)h(a)g(no)q(de)h(at)g(whic)o(h)e
3052 Fd(s)26 b(:)51 b(expr)43 b Fn(is)19 b(ap-)164 729 y(plied,)e(the)h
3053 (second)h(tra)o(v)o(ersal)f(action)g(is)g(executed,)f(the)h(tra)o(v)o
3054 (ersal)g(pro)q(ceeds)g(to)h(the)164 789 y(c)o(hild)c(subtree,)g(then)h
3055 (the)g(\014rst)h(tra)o(v)o(ersal)e(action)i(is)f(executed.)237
3056 849 y(The)i(preceding)f(description)g(is)h(generally)f(su\016cien)o(t)g
3057 (for)h(understanding)h(p)q(ost-)164 909 y(decoration)12
3058 b(tra)o(v)o(ersals,)h(but)f(app)q(endix)g(B)g(con)o(tains)h(a)f(pseudo)
3059 q(co)q(de)i(description)d(that)164 969 y(describ)q(es)16
3060 b(the)g(b)q(eha)o(vior)g(somewhat)g(more)f(formally)l(.)237
3061 1029 y(F)l(acilit)o(y)j(for)i(inorder)g(tra)o(v)o(ersal)f(is)g(to)i(b)q
3062 (e)f(implem)o(en)n(ted)d(in)j(future)f(v)o(ersions)h(of)164
3063 1090 y(Ox.)164 1256 y Fo(10)83 b(Ox)27 b(macros)164 1366
3064 y Fn(Ox's)17 b(input)h(sp)q(eci\014cation)f(ma)o(y)g(b)q(e)h(suc)o(h)f
3065 (that)h(the)g(same)f(or)h(similar)e(text)h(app)q(ears)164
3066 1426 y(in)22 b(more)f(than)h(one)h(place)e(in)h(attribute)g(reference)f
3067 (sections.)38 b(There)22 b(is)g(a)h(macro)164 1486 y(substitution)16
3068 b(feature)g(that)h(can)g(b)q(e)f(used)g(to)h(decrease)f(v)o(erb)q(osit)
3069 o(y)f(in)h(suc)o(h)g(cases.)164 1630 y Fb(10.1)70 b(Macro)24
3070 b(de\014nitions)164 1723 y Fn(Ox)19 b(macros)f(are)h(de\014ned)f(in)h
3071 (the)g(declaration)f(section)h(of)g(the)g(Y-\014le.)28
3072 b(Suc)o(h)19 b(a)g(def-)164 1783 y(inition)e(consists)i(of)f(the)g
3073 Fd(@macro)e Fn(reserv)o(ed)h(w)o(ord,)h(an)h(iden)o(ti\014er)d(\(the)i
3074 (name)f(of)h(the)164 1843 y(macro\),)j(a)h(left)e(paren)o(thesis,)i(a)g
3075 (parameter)e(list,)h(a)h(righ)o(t)f(paren)o(thesis,)h(the)f(b)q(o)q(dy)
3076 164 1903 y(of)d(the)f(macro,)f(and)i(the)f Fd(@end)f
3077 Fn(reserv)o(ed)g(w)o(ord.)25 b(The)17 b(parameter)f(list)h(is)g(a)h(p)q
3078 (ossibly)164 1964 y(empt)o(y)10 b(sequence)h(of)i(iden)o(ti\014ers,)e
3079 (eac)o(h)h(\(including)g(the)g(last,)h(if)f(the)g(list)f(is)i(nonempt)o
3080 (y\))164 2024 y(follo)o(w)o(ed)j(b)o(y)g(a)h(comma.)j(Eac)o(h)c(iden)o
3081 (ti\014er)f(is)h(a)h(sequence)f(of)h(letters)e(and)j(digits,)e(b)q(e-)
3082 164 2084 y(ginning)g(with)g(a)g(letter.)k(The)c(b)q(o)q(dy)h(of)f(the)g
3083 (macro)f(is)g(a)i(segmen)o(t)d(of)i(arbitrary)g(text,)164
3084 2144 y(terminated)j(b)o(y)i(the)g(\014rst)h(o)q(ccurrence)e(of)i
3085 Fd(@end)p Fn(,)e(with)h(the)g(follo)o(wing)g(exceptions:)164
3086 2204 y(When)e(inside)f(a)h(commen)o(t)d(or)j(a)g(string,)g(or)h(when)f
3087 (preceded)e(immediatel)o(y)f(b)o(y)i(the)164 2264 y(bac)o(kslash)g
3088 (escap)q(e)g(c)o(haracter,)g(an)g(o)q(ccurrence)g(of)g
3089 Fd(@end)f Fn(is)h(considered)f(part)i(of)f(the)164 2325
3090 y(macro)f(b)q(o)q(dy)i(\(hence)f(do)q(es)h(not)f(terminate)e(the)i
3091 (macro\).)26 b(Suc)o(h)18 b(a)h(bac)o(kslash)f(c)o(har-)164
3092 2385 y(acter)e(is)g(deleted)f(from)g(the)h(macro)f(b)q(o)q(dy)l(.)p
3095 24 24 bop 164 162 a Fk(10)50 b(O)o(X)20 b(MA)o(CR)o(OS)1162
3096 b Fn(24)164 307 y Fb(10.2)70 b(Macro)24 b(uses)164 400
3097 y Fn(Ox)f(macros)f(are)h(used)g(only)g(in)g(attribute)g(reference)e
3098 (sections)i(and)g(in)g(other)g(Ox)164 460 y(macros.)j(Substitution)18
3099 b(o)q(ccurs)g(where)g(a)g(macro)f(use)h(is)g(encoun)o(tered)f(outside)h
3100 (of)h(a)164 520 y(string,)d(commen)o(t,)d(or)j(attribute)g(name.)237
3101 580 y(A)h(macro)f(use)h(consists)g(of)h(the)e(name)g(of)h(a)h
3102 (previously-de\014ned)e(macro,)g(and)h(an)164 640 y(argumen)o(t)12
3103 b(list)h(in)g(paren)o(theses.)20 b(The)13 b(argumen)o(t)f(list)h(is)g
3104 (a)g(p)q(ossibly)h(empt)o(y)d(sequence)164 700 y(of)19
3105 b(text)g(fragmen)o(ts,)f(eac)o(h)g(\(including)g(the)h(last\))g(suc)o
3106 (h)f(fragmen)o(t)g(terminated)f(b)o(y)i(a)164 761 y(comma.)f(In)12
3107 b(expanding)h(a)h(macro)e(use,)h(eac)o(h)f(text)g(fragmen)o(t)g(is)g
3108 (substituted)h(for)g(eac)o(h)164 821 y(o)q(ccurrence)j(in)h(the)g
3109 (macro)f(b)q(o)q(dy)i(of)g(the)e(corresp)q(onding)i(parameter)e(in)h
3110 (the)g(macro)164 881 y(de\014nition.)33 b(If)20 b(commas,)f(paren)o
3111 (theses,)h(or)h(bac)o(kslashes)f(are)h(to)g(app)q(ear)g(in)f(a)h(text)
3112 164 941 y(fragmen)o(t,)16 b(they)g(m)o(ust)g(b)q(e)i(preceded)e(b)o(y)h
3113 (bac)o(kslash)g(escap)q(e)h(c)o(haracters,)e(whic)o(h)h(are)164
3114 1001 y(remo)o(v)o(ed)d(during)i(substitution.)237 1062
3115 y(It)f(is)h(not)g(necessary)f(that)h(the)g(de\014nition)f(of)h(a)g
3116 (macro)f(precede)f(that)i(of)g(another)164 1122 y(macro)d(in)g(whic)o
3117 (h)g(it)g(is)h(used,)g(as)g(no)g(macro)f(substitution)h(o)q(ccurs)g(un)
3118 o(til)f(Ox)g(pro)q(cesses)164 1182 y(the)j(attribute)g(reference)e
3119 (sections.)164 1326 y Fb(10.3)70 b(Example)164 1419 y
3120 Fn(The)16 b(follo)o(wing)g(excerpts)f(from)h(a)g(Y-\014le)g(illustrate)
3121 f(the)h(use)g(of)h(Ox)f(macros.)p eop
3123 25 25 bop 164 162 a Fk(11)50 b(A)o(UTOMA)l(TIC)14 b(GENERA)l(TION)h(OF)
3124 h(COPY)g(R)o(ULES)386 b Fn(25)237 295 y(.)237 312 y(.)237
3125 329 y(.)164 412 y Fa(@macro)21 b(exprdefs\(op,\))208
3126 462 y(@i)g(@expr.1.env@)e(=)j(@expr.env@;)208 512 y(@i)f(@expr.2.env@)e
3127 (=)j(@expr.env@;)208 562 y(@i)f(@expr.type@)e(=)j(typeResolve\(@expr.)o
3128 (1.ty)o(pe@,@)o(expr.)o(2.typ)o(e@,\);)208 612 y(@i)f(@expr.value@)e(=)
3129 j(exprEval\(op,@expr)o(.typ)o(e@,@e)o(xpr.1)o(.type)o(@,@ex)o(pr.2.)o
3130 (type)o(@,)861 661 y(@expr.1.value@,@exp)o(r.2.v)o(alue@)774
3131 711 y(\);)164 761 y(@end)164 861 y(@macro)f(typeResolve\(typ)o(e1,ty)o
3132 (pe2,\))229 910 y(\(\(type1)g(==)g(type2\))g(?)g(type1)g(:)h
3133 (FLOATTYPE\))164 960 y(@end)237 1028 y Fn(.)237 1045
3134 y(.)237 1061 y(.)164 1145 y Fa(\045\045)237 1216 y Fn(.)237
3135 1233 y(.)237 1249 y(.)164 1333 y Fa(expr)f(:)152 b(expr)87
3136 b('*')108 b(expr)382 1383 y(@{)21 b(exprdefs\('*',\))e(@})338
3137 1433 y(|)153 b(expr)86 b('/')108 b(expr)382 1483 y(@{)21
3138 b(exprdefs\('/',\))e(@})338 1532 y(|)153 b(expr)86 b('+')108
3139 b(expr)382 1582 y(@{)21 b(exprdefs\('+',\))e(@})338 1632
3140 y(|)153 b(expr)86 b('-')108 b(expr)382 1682 y(@{)21 b(exprdefs\('-',\))
3141 e(@})338 1732 y(;)237 1805 y Fn(.)237 1822 y(.)237 1838
3142 y(.)164 1959 y(The)e(iden)o(ti\014er)f Fd(exprEval)f
3143 Fn(referenced)h(in)h(the)g(de\014nition)g(of)h(the)f
3144 Fd(exprdefs)e Fn(macro)164 2019 y(is)h(the)f(name)g(of)h(either)f(a)h
3145 (C)g(macro)f(or)h(C)g(function.)21 b(The)16 b(Ox)f(macro)g
3146 Fd(typeResolv)o(e)164 2079 y Fn(ab)q(o)o(v)o(e)e(con)o(tains)g(no)g
3147 (Ox-sp)q(eci\014c)f(constructs)h(and,)h(as)f(a)h(matter)d(of)i(st)o
3148 (yle,)f(could)h(ha)o(v)o(e)164 2139 y(b)q(een)j(declared)g(instead)g
3149 (as)h(a)f(C)h(macro)e(or)i(C)f(function.)164 2304 y Fo(11)83
3150 b(Automatic)27 b(generation)h(of)g(cop)n(y)e(rules)164
3151 2414 y Fn(Often)13 b(a)g(Y-\014le)f(has)i(attribute)f(de\014nitions)g
3152 (that)h(function)f(only)f(to)i(cop)o(y)f(an)g(instance)164
3153 2474 y(b)q(elonging)f(to)g(one)f(no)q(de)i(to)e(a)h(lik)o(e-named)d
3154 (instance)i(b)q(elonging)h(to)g(the)f(no)q(de's)h(paren)o(t)p
3157 26 26 bop 164 162 a Fk(11)50 b(A)o(UTOMA)l(TIC)14 b(GENERA)l(TION)h(OF)
3158 h(COPY)g(R)o(ULES)386 b Fn(26)164 307 y(or)24 b(c)o(hild.)43
3159 b(Large)25 b(attribute)f(grammars)f(tend)h(to)g(ha)o(v)o(e)f(man)o(y)g
3160 (suc)o(h)h(de\014nitions,)164 367 y(whic)o(h)19 b(are)g(sometimes)e
3161 (called)h Fg(c)n(opy)i(rules)t Fn(.)32 b(The)20 b(situation)f(is)h
3162 (conspicuous)g(when)164 428 y(con)o(textual)15 b(information)h(is)g(mo)
3163 o(v)o(ed)e(leafw)o(ard)i(via)g(inherited)f(attributes.)237
3164 488 y(The)i(Ox)g(user)g(ma)o(y)f(place)h(in)g(the)g(declarations)g
3165 (section)g(of)g(the)g(Y-\014le)g(the)f(con-)164 548 y(struct:)237
3166 668 y Fd(@autoinh)d Fi(<)p Fn(ID)p 554 668 15 2 v 18
3167 w(list)p Fi(>)164 789 y Fn(where)j Fi(<)p Fn(ID)p 401
3168 789 V 18 w(list)p Fi(>)g Fn(is)g(a)h(whitespace-separated)h(list)e(of)h
3169 (attribute)f(names.)22 b(Supp)q(ose)164 849 y(that)16
3170 b Fd(attrbID)c Fn(is)k(suc)o(h)f(an)g(attribute)g(name,)f(and)i(the)f
3171 (ab)q(o)o(v)o(e)g(construct)h(is)f(follo)o(w)o(ed)164
3172 909 y(b)o(y)f(an)i Fd(@attribut)o(es)c Fn(declaration)i(whereb)o(y)g
3173 Fd(attrbID)f Fn(is)h(declared)g(as)i(an)f(attribute)164
3174 969 y(of)i(the)f(grammar)f(sym)o(b)q(ol)g Fd(gSym)p Fn(.)21
3175 b(Then)c(Ox)f(kno)o(ws)h(that)g Fd(attrbID)d Fn(is)i(an)h(inherited)164
3176 1029 y(attribute)12 b(of)h Fd(gSym)p Fn(.)19 b(F)l(urther,)12
3177 b(for)h(an)o(y)f(rule)g(ha)o(ving)h Fd(gSym)e Fn(on)i(the)f(RHS,)g(Ox)g
3178 (searc)o(hes)164 1090 y(that)k(rule's)g(attribute)f(reference)g
3179 (section)g(for)i(de\014nitions)f(of)g(the)g(RHS)f(o)q(ccurrences)164
3180 1150 y(of)j Fd(attrbID)p Fn(.)c(When)j(suc)o(h)g(a)h(de\014nition)e(is)
3181 h(missing,)f(Ox)h(c)o(hec)o(ks)f(whether)h(the)g(LHS)164
3182 1210 y(has)g(an)f(o)q(ccurrence)f(of)h Fd(attrbID)p Fn(.)d(If)i(so,)i
3183 (Ox)e(generates)h(de\014nitions)g(that)g(cop)o(y)f(that)164
3184 1270 y(LHS)i(o)q(ccurrence)f(to)h(eac)o(h)g(RHS)f Fd(attrbID)f
3185 Fn(o)q(ccurrence)h(that)h(lac)o(ks)f(a)i(de\014nition.)k(If)164
3186 1330 y(there)16 b(is)g(no)g(suc)o(h)g(LHS)h(o)q(ccurrence,)e(Ox)h
3187 (issues)g(an)h(error)f(message.)237 1391 y(There)j(is)h(an)g(analagous)
3188 h(construct)f(for)g(automatic)e(generation)i(of)g(de\014nitions)164
3189 1451 y(of)d(syn)o(thesized)d(o)q(ccurrences:)237 1571
3190 y Fd(@autosyn)f Fi(<)p Fn(ID)p 554 1571 V 18 w(list)p
3191 Fi(>)164 1692 y Fn(When)23 b(the)f Fd(@autosyn)e Fn(construct)i(is)h
3192 (used,)h(Ox)e(tries)g(to)h(supply)g(missing)e(de\014ni-)164
3193 1752 y(tions)e(of)g(syn)o(thesized)f(o)q(ccurrences)g(b)o(y)h(searc)o
3194 (hing)f(the)h(RHS)f(for)h(same-named)e(o)q(c-)164 1812
3195 y(currences.)41 b(If)23 b(exactly)f(one)i(suc)o(h)f(RHS)f(o)q
3196 (ccurrence)h(is)g(found,)i(Ox)e(generates)h(a)164 1872
3197 y(de\014nition)16 b(to)g(cop)o(y)g(it)g(to)h(the)f(LHS,)g(otherwise)g
3198 (there)f(is)h(an)h(error.)237 1932 y(The)i(ab)q(o)o(v)o(e-describ)q(ed)
3199 f(constructs)i(ha)o(v)o(e)e(a)h(global)g(c)o(haracter)f(in)h(that)g(a)g
3200 (single)164 1993 y Fd(@autosyn)12 b Fn(or)j Fd(@autoinh)c
3201 Fn(declaration)j(can)h(easily)f(b)q(e)h(used)f(to)h(supply)g(missing)e
3202 (de\014-)164 2053 y(nitions)e(for)h(all)f(o)q(ccurrences)g(of)h
3203 (attributes)g(of)g(a)f(giv)o(en)g(name.)19 b(These)11
3204 b(reserv)o(ed)f(w)o(ords)164 2113 y(ma)o(y)17 b(b)q(e)i(used)g(in)g(a)g
3205 (more)e(conserv)m(ativ)o(e)h(w)o(a)o(y)h(that)g(generates)g(missing)e
3206 (de\014nitions)164 2173 y(only)f(for)h(o)q(ccurrences)e(b)q(elonging)i
3207 (to)g(a)f(selected)f(set)h(of)h(grammar)e(sym)o(b)q(ols:)237
3208 2233 y(A)o(ttribute)24 b(declarations)h(are)g(written)f(as)i(usual,)h
3209 (except)d(that)h Fd(@autoinh)e Fn(or)164 2293 y Fd(@autosyn)18
3210 b Fn(ma)o(y)h(app)q(ear)j(b)q(efore)f(the)g(attribute's)f(t)o(yp)q(e)h
3211 (sp)q(eci\014er)f(\(i.e.,)g(after)h Fc(f)g Fn(or)164
3212 2354 y Fd(;)p Fn(\).)g(Where)15 b Fi(<)p Fn(ID)p 495
3213 2354 V 18 w(list)p Fi(>)g Fn(is)h(the)g(usual)h(comma-)d(separated)j
3214 (list)e(of)h(attribute)g(names,)164 2414 y(and)h Fd(attrbID)c
3215 Fn(is)k(a)f(mem)o(b)q(er)d(of)k Fi(<)p Fn(ID)p 883 2414
3216 V 17 w(list)p Fi(>)p Fn(:)p eop
3218 27 27 bop 164 162 a Fk(11)50 b(A)o(UTOMA)l(TIC)14 b(GENERA)l(TION)h(OF)
3219 h(COPY)g(R)o(ULES)386 b Fn(27)237 307 y Fd(@attribute)o(s)87
3220 b Fc(f)676 354 y Fn(.)676 370 y(.)676 387 y(.)676 447
3221 y Fd(@autoinh)13 b Fi(<)p Fn(t)o(yp)q(esp)q(ec)p Fi(>)j(<)p
3222 Fn(ID)p 1270 447 15 2 v 17 w(list)p Fi(>)g Fd(;)676 491
3223 y Fn(.)676 507 y(.)676 524 y(.)603 584 y Fc(g)619 644
3224 y Fi(<)p Fn(grammar)p 854 644 V 16 w(sym)o(b)q(ol)p 1022
3225 644 V 16 w(list)p Fi(>)164 764 y Fn(declares)j Fd(attrbID)e
3226 Fn(as)j(an)g(inherited)f(attribute)g(whenev)o(er)g(it)g(o)q(ccurs)h(in)
3227 f(a)h(sym)o(b)q(ol)164 825 y(in)15 b Fi(<)p Fn(grammar)p
3228 455 825 V 16 w(sym)o(b)q(ol)p 623 825 V 16 w(list)p Fi(>)p
3229 Fn(.)21 b(F)l(urther,)14 b(this)i(instructs)f(Ox)h(to)g(attempt)e(to)i
3230 (supply)164 885 y(missing)f(de\014nitions)h(of)g(suc)o(h)h(o)q
3231 (ccurrences)e(b)o(y)h(cop)o(ying)g(from)f(the)h(LHS.)237
3232 945 y Fd(@autosyn)d Fn(ma)o(y)i(b)q(e)i(used)f(lo)q(cally)f(in)h(an)h
3233 (analagous)h(manner.)237 1005 y(F)l(or)i(safet)o(y)g(in)f(the)h(use)g
3234 (of)g Fd(@autosyn)d Fn(and)k Fd(@autoinh)p Fn(,)c(there)i(is)h(pro)o
3235 (vided)f(the)164 1065 y Fd(@warn)d Fn(reserv)o(ed)g(w)o(ord.)26
3236 b(When)18 b(it)f(immediatel)o(y)e(follo)o(ws)i Fd(@autosyn)e
3237 Fn(or)j Fd(@autoinh)p Fn(,)164 1126 y(Ox)g(issues)h(a)g(w)o(arning)g
3238 (for)g(eac)o(h)g(de\014nition)f(supplied)g(b)o(y)g(virtue)g(of)h(the)g
3239 (preceding)164 1186 y Fd(@autosyn)h Fn(or)i Fd(@autoinh)p
3240 Fn(.)38 b Fd(@warn)20 b Fn(is)j(mainly)d(to)j(b)q(e)g(used)f(when)h(mo)
3241 q(difying)e(the)164 1246 y(attribute)16 b(grammar.)164
3242 1390 y Fb(11.1)70 b(Example)164 1483 y Fn(The)16 b(follo)o(wing)g(co)q
3243 (de)h(fragmen)o(t)e(in)g(the)h(declarations)h(section)f(of)g(the)g
3246 28 28 bop 164 162 a Fk(11)50 b(A)o(UTOMA)l(TIC)14 b(GENERA)l(TION)h(OF)
3247 h(COPY)g(R)o(ULES)386 b Fn(28)383 295 y(.)383 312 y(.)383
3248 329 y(.)292 430 y Fd(@autoinh)23 b(env)292 551 y(@attribute)o(s)g
3249 ({struct)g(env)h(*env;)625 611 y(regNumType)e(maxRegNum;)600
3250 671 y(})600 731 y(execElem)g(statement)292 852 y(@autosyn)h(maxRegNum)
3251 292 972 y(@attribute)o(s)g({struct)g(env)h(*env;)625
3252 1032 y(@autoinh)f(regNumType)f(regNum;)625 1092 y(regNumType)g
3253 (maxRegNum;)625 1153 y(struct)i(sym)g(*formParamL)o(ist)o(;)625
3254 1213 y(struct)g(sym)g(*func;)625 1273 y(lineNumType)e(line;)600
3255 1333 y(})600 1393 y(actParamL)o(ist)292 1514 y(@attribute)o(s)h
3256 ({struct)g(env)h(*env;)625 1574 y(@autosyn)f(@warn)h(struct)f(sym)i
3257 (*varLoc,*f)o(un)o(cLo)o(c;)625 1634 y(regNumType)d(regNum;)625
3258 1694 y(regNumType)g(maxRegNum;)600 1755 y(})600 1815
3259 y(block)i(blockElem)o(Li)o(st)383 1890 y Fn(.)383 1907
3260 y(.)383 1923 y(.)164 2044 y(causes)g(Ox)f(to)h(attempt)e(to)h
3261 (automatically)f(supply)h(missing)f(de\014nitions)i(for)f(o)q(c-)164
3262 2104 y(currences)15 b(of:)p eop
3264 29 29 bop 164 162 a Fk(12)50 b(FILE-LEVEL)17 b(OR)o(GANIZA)l(TION)c(OF)
3265 j(O)o(X)21 b(EV)-5 b(ALUA)l(TORS)237 b Fn(29)237 307
3266 y Fc(\017)24 b Fd(env)10 b Fn(for)h Fd(execElem)p Fn(,)d
3267 Fd(statement)p Fn(,)g Fd(actParamLis)o(t)p Fn(,)h Fd(block)p
3268 Fn(,)g(and)j Fd(blockElem)o(Lis)o(t)237 409 y Fc(\017)24
3269 b Fd(maxRegNum)13 b Fn(for)j Fd(actParamLis)o(t)p Fn(,)d
3270 Fd(block)p Fn(,)h(and)j Fd(blockElem)o(Lis)o(t)237 511
3271 y Fc(\017)24 b Fd(regNum)14 b Fn(for)i Fd(actParamLis)o(t)237
3272 612 y Fc(\017)24 b Fd(varLoc)14 b Fn(for)i Fd(block)f
3273 Fn(and)i Fd(blockElem)o(Lis)o(t)p Fn(,)c(with)j(w)o(arning)237
3274 714 y Fc(\017)24 b Fd(funcLoc)14 b Fn(for)i Fd(block)f
3275 Fn(and)h Fd(blockElemLi)o(st)p Fn(,)c(with)17 b(w)o(arning)164
3276 880 y Fo(12)83 b(File-lev)n(el)26 b(organization)i(of)g(Ox)f(ev)-5
3277 b(aluators)164 1004 y Fb(12.1)70 b(Con)n(v)n(en)n(tions)23
3278 b(of)g(naming)g(Ox)f(output)i(\014les)164 1097 y Fn(Ox)15
3279 b(translates)h(the)f(Y-\014le)f(in)o(to)h(a)h(\014le)e(destined)h(for)h
3280 (pro)q(cessing)g(b)o(y)e(Y)l(acc,)h(giv)o(en)f(the)164
3281 1157 y(name)26 b Fd(oxout.y)p Fn(.)17 b(The)d(L-\014les)g(are)f
3282 (translated)h(in)o(to)f(\014les)g(destined)g(for)g(Lex.)21
3283 b(If)13 b(there)164 1217 y(is)h(exactly)f(one)h(L-\014le,)g(its)g
3284 (corresp)q(onding)h(output)g(\014le)e(is)h(named)f Fd(oxout.l)p
3285 Fn(.)18 b(If)c(there)164 1277 y(is)23 b(more)f(than)i(one)f(L-\014le,)i
3286 (the)e(corresp)q(onding)i(outputs)f(are)f(named)f Fd(oxout0.l)p
3287 Fn(,)164 1338 y Fd(oxout1.l)p Fn(,)13 b Fd(oxout2.l)p
3288 Fn(,)g(etc.)164 1482 y Fb(12.2)70 b(Review:)26 b(com)n(bining)17
3289 b(the)h(outputs)i(of)f(Y)-6 b(acc)18 b(and)i(Lex)164
3290 1574 y Fn(In)f(dev)o(eloping)f(an)i(ordinary)f(\(i.e.,)f(non-Ox\))i(Y)l
3291 (acc/Lex)f(ev)m(aluator,)h Fd(y.tab.c)c Fn(and)164 1635
3292 y Fd(lex.yy.c)11 b Fn(can)i(b)q(e)h(compiled)d(imme)o(diately)f(in)o
3293 (to)j(an)h(executable)e(\014le)h(b)o(y)g(placing)g(the)164
3294 1695 y(line)369 1796 y Fd(#include)23 b("lex.yy.c)o(")164
3295 1898 y Fn(in)16 b(a)h(C-co)q(de)f(section)g(of)h(the)f(Y)l(acc)f(input)
3296 h(sp)q(eci\014cation)g([Lesk)g(75)q(].)237 1958 y(Alternativ)o(ely)l(,)
3297 c(Y)l(acc)j(can)g(b)q(e)g(instructed)g(\(b)o(y)g(using)g(the)g
3298 Fd(-d)g Fn(command-line)d(op-)164 2019 y(tion\))h(to)g(pro)q(duce)h(a)f
3299 (separate)h(\014le)e Fd(y.tab.h)e Fn(that)k(con)o(tains)f(declarations)
3300 g(needed)f(b)o(y)164 2079 y(b)q(oth)j Fd(y.tab.c)d Fn(and)i
3301 Fd(lex.yy.c)p Fn(.)k(The)c(t)o(w)o(o)g(\014les)g(ma)o(y)e(then)i(b)q(e)
3302 g(compiled)e(separately)164 2139 y(if)k(the)g(line)369
3303 2241 y Fd(#include)23 b("y.tab.h")164 2342 y Fn(is)11
3304 b(placed)g(in)f(a)i(C-co)q(de)g(sections)f(of)g(the)g(Lex)g(input)g(sp)
3305 q(eci\014cation.)19 b(The)11 b(t)o(w)o(o)g(resulting)164
3306 2402 y(ob)s(ject)16 b(\014les)f(can)i(then)f(b)q(e)g(link)o(ed)f(to)i
3307 (pro)q(duce)f(an)h(executable)e(\014le.)p eop
3309 30 30 bop 164 162 a Fk(13)50 b(COMMAND-LINE)15 b(OPTIONS)h(AND)f(OTHER)
3310 h(POINTS)298 b Fn(30)164 307 y Fb(12.3)70 b(Com)n(bined)21
3311 b(use)i(of)g(Ox,)g(Y)-6 b(acc,)23 b(and)h(Lex)164 400
3312 y Fn(There)17 b(are)g(certain)g(declarations)g(that)g(m)o(ust)f(b)q(e)i
3313 (visible)d(from)h(all)h(of)g(the)g(\014les)g(pro-)164
3314 460 y(duced)12 b(b)o(y)g(Ox.)20 b(By)12 b(default,)g(Ox)h(pro)q(duces)g
3315 (\014les)f(suitable)g(for)h(separate)g(compilation,)164
3316 520 y(inasm)o(uc)o(h)i(as)i(the)g(Y)l(acc-destined)f(\014le)g(and)h
3317 (the)g(Lex-destined)f(\014le\(s\))h(eac)o(h)f(con)o(tain)164
3318 580 y(the)k(common)e(declarations.)34 b(Ox)20 b(also)g(supp)q(orts)i
3319 (the)e(one-step)h(dev)o(elopmen)o(t)c(ap-)164 640 y(proac)o(h)g
3320 (describ)q(ed)g(ab)q(o)o(v)o(e.)23 b(By)16 b(placing)h
3321 Fd(-h)f Fn(on)i(Ox's)e(command)f(line,)g(the)i(designer)164
3322 700 y(calls)j(for)h(generation)f(of)h(a)g(\014le)f Fd(oxout.h)e
3323 Fn(con)o(taining)i(the)g(common)e(declarations,)164 761
3324 y(whic)o(h)e(are)g(then)g(absen)o(t)g(from)f(Ox's)h(other)h(output)f
3325 (\014les.)21 b(In)16 b(this)g(case,)g(the)g(line)369
3326 862 y Fd(#include)23 b("oxout.h")164 964 y Fn(is)16 b(placed)g(in)g
3327 (the)g(Y-\014le.)164 1109 y Fb(12.4)70 b(T)n(ypical)21
3328 b(command)i(sequences)164 1201 y Fn(The)g(follo)o(wing)g(sequence)g(of)
3329 g(shell)g(commands)e(is)j(an)g(example)d(of)i(the)g(separate)164
3330 1261 y(compilation)c(approac)o(h)i(describ)q(ed.)33 b(In)20
3331 b(this)g(example,)f(Ox)h(translates)h(the)f(Y-\014le)164
3332 1321 y Fd(ev.Y)c Fn(in)o(to)h Fd(oxout.y)e Fn(and)i(the)h(L-\014le)f
3333 Fd(ev.L)f Fn(in)o(to)h Fd(oxout.l)p Fn(.)22 b(The)17
3334 b(last)g(command)f(of)164 1381 y(the)g(sequence)f(links)h(the)g(t)o(w)o
3335 (o)g(ob)s(ject)f(\014les,)h(yielding)f(the)h(executable)e(\014le)i
3336 Fd(ev)p Fn(.)338 1485 y Fa(ox)22 b(ev.Y)f(ev.L)338 1535
3337 y(yacc)g(-d)h(oxout.y)338 1585 y(lex)f(oxout.l)338 1635
3338 y(cc)h(-c)f(y.tab.c)338 1684 y(cc)h(-c)f(lex.yy.c)338
3339 1734 y(cc)h(-o)f(ev)g(y.tab.o)g(lex.yy.o)f(-ll)h(-ly)237
3340 1838 y Fn(The)16 b(follo)o(wing)g(command)f(sequence)g(do)q(es)i(a)f
3341 (one-step)h(compilation.)338 1929 y Fa(ox)22 b(-h)f(ev.Y)g(ev.L)338
3342 1979 y(yacc)g(oxout.y)338 2029 y(lex)g(oxout.l)338 2079
3343 y(cc)h(y.tab.c)e(-ll)h(-ly)164 2245 y Fo(13)83 b(Command-line)26
3344 b(options)i(and)f(other)g(p)r(oin)n(ts)164 2355 y Fn(This)17
3345 b(section)f(describ)q(es)g(some)g(\014ne)g(p)q(oin)o(ts,)h(mostly)e
3346 (related)h(to)h(Ox)f(command-line)164 2415 y(options.)22
3347 b(Use)16 b(of)g(those)h(options)g(is)f(summarized)d(in)j(app)q(endix)g
3350 31 31 bop 164 162 a Fk(13)50 b(COMMAND-LINE)15 b(OPTIONS)h(AND)f(OTHER)
3351 h(POINTS)298 b Fn(31)164 307 y Fb(13.1)70 b(Error)24
3352 b(reco)n(v)n(ery)164 400 y Fn(Y)l(acc)14 b(has)h(pro)o(visions)g(for)g
3353 (building)f(parsers)i(that)f(attempt)e(to)i(reco)o(v)o(er)e(from)h(syn)
3354 o(tax)164 460 y(errors,)j(and)g(the)g(designer)g(can)g(use)g(the)f(w)o
3355 (ords)i Fd(error)p Fn(,)d Fd(yyerrok)p Fn(,)f(and)j Fd(yyclearin)164
3356 520 y Fn(to)f(implem)o(e)o(n)o(t)c(suc)o(h)j(error)g(reco)o(v)o(ery)f
3357 ([Johnson)j(75)q(].)j(When)15 b(a)h(parser)f(that)h(emplo)o(ys)164
3358 580 y(suc)o(h)k(tec)o(hniques)e(detects)h(a)h(syn)o(tax)g(error,)g(it)f
3359 (ma)o(y)g(attempt)f(to)i(reco)o(v)o(er)e(b)o(y)i(p)q(op-)164
3360 640 y(ping)g(items)d(from)i(its)g(stac)o(k)g(or)h(b)o(y)f(discarding)g
3361 (tok)o(ens.)31 b(During)20 b(normal)f(parsing,)164 700
3362 y(the)g(Ox-generated)h(ev)m(aluator)g(sync)o(hronizes)e(its)i(stac)o(k)
3363 f(op)q(erations)h(with)g(those)g(of)164 761 y(the)h(Y)l(acc-generated)f
3364 (parser)h(\(see)g(section)f(7\).)36 b(When)21 b(the)f(parser)i(is)e
3365 (built)h(using)164 821 y Fd(error)p Fn(,)14 b Fd(yyerrok)p
3366 Fn(,)e(or)17 b Fd(yyclearin)o Fn(,)c(and)j(a)g(syn)o(tax)g(error)g(o)q
3367 (ccurs,)f(this)h(sync)o(hroniza-)164 881 y(tion)j(is)g(lost.)29
3368 b(It)18 b(is)h(p)q(ossible)g(for)h(the)e(ev)m(aluator)i(to)f(corrupt)g
3369 (its)g(stac)o(k)f(and)i(go)f(out)164 941 y(of)d(con)o(trol)f(in)h(suc)o
3370 (h)f(cases.)22 b(Ox)15 b(pro)o(vides)g(the)h(function)f
3371 Fd(yyyerror)e Fn(to)j(prev)o(en)o(t)e(suc)o(h)164 1001
3372 y(c)o(haos.)35 b(The)21 b(parser)g(calls)f Fd(yyerror)f
3373 Fn(up)q(on)j(an)o(y)e(syn)o(tax)h(error,)g(and)h(the)e(designer)164
3374 1062 y(should)k(write)e Fd(yyerror)f Fn(suc)o(h)i(that)h
3375 Fd(yyyerror)c Fn(is)k(executed)d(at)j(least)f(once)g(eac)o(h)164
3376 1122 y(time)c Fd(yyerror)f Fn(is)j(called.)35 b(An)o(y)20
3377 b(syn)o(tax)h(error)g(will)f(then)g(cancel)h(parse-tree)f(con-)164
3378 1182 y(struction)14 b(and)h(attribute)f(ev)m(aluation,)g(and)h(it)f(is)
3379 g(ensured)g(that)g(the)g(Y)l(acc-generated)164 1242 y(co)q(de)h(can)f
3380 (con)o(tin)o(ue)f(safely)l(.)20 b(Use)14 b(of)h Fd(yyyerror)c
3381 Fn(is)j(unnecessary)h(but)f(harmless)f(if)h(the)164 1302
3382 y(Y-\014le)h(mak)o(es)g(no)i(use)f(of)h(the)f(w)o(ords)g
3383 Fd(error)p Fn(,)e Fd(yyerrok)p Fn(,)g(and)i Fd(yyclearin)p
3384 Fn(.)164 1447 y Fb(13.2)70 b(Memory)23 b(alignmen)n(t)164
3385 1539 y Fn(Man)o(y)12 b(computing)g(systems)g(ha)o(v)o(e)g(hardw)o
3386 (are-related)h(constrain)o(ts)g(on)h(the)e(addresses)164
3387 1599 y(used)i(for)f(memory)e(accesses.)20 b(F)l(or)13
3388 b(example,)f(for)h(a)h(certain)f(t)o(yp)q(e)g(it)g(ma)o(y)f(b)q(e)h
3389 (required)164 1660 y(that)i(the)g(\014rst)g(b)o(yte)g(of)g(storage)h
3390 (for)f(eac)o(h)g(v)m(ariable)f(of)i(that)f(t)o(yp)q(e)g(reside)f(at)h
3391 (an)h(ev)o(en-)164 1720 y(n)o(um)o(b)q(ered)k(address.)39
3392 b(Then)23 b(an)f(instruction)g(to)g(access)g(a)h(v)m(ariable)f(of)g
3393 (that)g(t)o(yp)q(e)164 1780 y(at)c(an)g(o)q(dd-n)o(um)o(b)q(ered)f
3394 (address)i(results)e(in)h(a)g(run-time)e(error.)26 b(When)18
3395 b(Ox)f(is)h(giv)o(en)164 1840 y(the)k Fd(-a)p Fi(N)k
3396 Fn(command-line)19 b(option,)k(it)e(pro)q(duces)i(an)f(ev)m(aluator)g
3397 (that)g(aligns)g(all)g(C)164 1900 y(structures)14 b(on)h(addresses)h
3398 (divisible)c(b)o(y)i(the)h(in)o(teger)e Fi(N)5 b Fn(.)21
3399 b(The)15 b(default)f(v)m(alue)g(for)h(this)164 1961 y(alignmen)o(t)f
3400 (constan)o(t)j(is)f(4,)g(whic)o(h)g(is)g(adequate)g(for)h(nearly)e(all)
3401 h(curren)o(t)f(computers.)164 2105 y Fb(13.3)70 b(Stripping)22
3402 b(Ox)h(constructs)164 2197 y Fn(Occasionally)l(,)16 b(the)h(designer)g
3403 (ma)o(y)e(wish)i(copies)g(of)g(the)g(Y-\014le)f(and)i(L-\014le\(s\))f
3404 (free)g(of)164 2258 y(Ox-sp)q(eci\014c)c(constructs.)20
3405 b(Supp)q(ose,)15 b(for)f(instance,)f(that)h(c)o(hanges)g(to)f(the)h
3406 (underlying)164 2318 y(grammar)h(are)i(under)f(consideration,)h(and)g
3407 (that)g(it)g(is)f(desired)g(to)h(test)g(whether)f(the)164
3408 2378 y(new)j(grammar)e(has)i(parsing)h(con\015icts.)29
3409 b(T)l(o)19 b(satisfy)g(Ox)f(seman)o(tics)f(migh)o(t)g(require)164
3410 2438 y(writing)12 b(attribute)f(de\014nitions)h(for)h(an)o(y)f(new)g
3411 (rules.)19 b(Ox's)11 b(output)i(on)g Fd(oxout.y)c Fn(could)p
3414 32 32 bop 164 162 a Fk(13)50 b(COMMAND-LINE)15 b(OPTIONS)h(AND)f(OTHER)
3415 h(POINTS)298 b Fn(32)164 307 y(then)16 b(b)q(e)g(submitted)f(to)i(Y)l
3416 (acc)e(to)i(test)f(for)g(parsing)h(con\015icts.)237 367
3417 y(T)l(o)23 b(a)o(v)o(oid)f(the)g(ab)q(o)o(v)o(e-men)o(tioned)f(writing)
3418 h(of)h(attribute)f(de\014nitions,)i(the)e(de-)164 428
3419 y(signer)h(can)g(use)g(Ox's)f Fd(-S)g Fn(command-line)e(option,)25
3420 b(whic)o(h)d(\014lters)g(all)h(Ox-sp)q(eci\014c)164 488
3421 y(constructs)17 b(from)e(the)h(inputs)g(and)h(yields)e(\014les)h
3422 (acceptable)g(to)g(Y)l(acc)g(and)h(Lex.)k(The)164 548
3423 y(original)14 b(copies)h(of)g(the)f(Y-\014le)g(and)h(L-\014le\(s\))g
3424 (are)f(unc)o(hanged,)h(but)g(Ox's)f(outputs)h(on)164
3425 608 y Fd(oxout.*)10 b Fn(con)o(tain)h(neither)h(Ox)f(constructs)i(nor)g
3426 (the)e(usual)i(Ox-generated)f(parse-tree)164 668 y(managemen)o(t)i(co)q
3427 (de.)164 809 y Fb(13.4)70 b(Prev)n(en)n(ting)15 b(execution)e(of)j
3428 (attribute)e(de\014nition)g(co)r(de)164 902 y Fn(F)l(ault)o(y)22
3429 b(user-written)g(co)q(de)h(in)f(attribute)g(reference)f(sections)h(ma)o
3430 (y)f(cause)i(abnor-)164 962 y(mal)16 b(termination)g(of)i(the)f
3431 (Ox-generated)h(ev)m(aluator.)26 b(F)l(or)17 b(instance,)g
3432 (dereferencing)164 1022 y(a)i(stra)o(y)f(p)q(oin)o(ter)g(ma)o(y)e
3433 (corrupt)i(the)g(ev)m(aluator's)h(data)g(structures)f(and)h(cause)f(it)
3434 g(to)164 1082 y(falsely)d(rep)q(ort)h(a)h(cycle)d(during)i(attribute)g
3435 (ev)m(aluation.)21 b(The)16 b Fd(-n)f Fn(command-line)e(op-)164
3436 1143 y(tion)f(is)f(a)h(debugging)g(feature)g(that)g(can)f(b)q(e)h(used)
3437 g(to)g(isolate)f(the)h(e\013ects)f(of)h(anomalous)164
3438 1203 y(attribute)17 b(de\014nition)h(co)q(de.)26 b(When)18
3439 b(Ox)f(is)h(used)g(with)f(this)h(option,)g(the)g(generated)164
3440 1263 y(ev)m(aluator)j(uses)f(the)g(ready)g(set)g(as)g(usual)h(to)f
3441 (determine)e(an)i(ev)m(aluation)g(order)h(for)164 1323
3442 y(attribute)15 b(instances,)g(and)h(still)e(c)o(hec)o(ks)g(for)i
3443 (cycles.)j(Eac)o(h)c(time)f(it)h(is)g(ready)g(to)h(solv)o(e)164
3444 1383 y(an)i(instance,)g(ho)o(w)o(ev)o(er,)e(it)h(stops)i(short)g(of)f
3445 (executing)e(the)i(co)q(de)g(for)g(the)f(de\014nition)164
3446 1444 y(of)j(that)f(instance.)31 b(When)19 b Fd(-n)g Fn(is)g(used,)h
3447 (the)f(designer)g(should)h(tak)o(e)f(sp)q(ecial)g(notice)164
3448 1504 y(of)f(the)f(e\013ects)f(up)q(on)j(other)e(translation)h(phases)g
3449 (of)g(suc)o(h)f(suppression)g(of)h(seman)o(tic)164 1564
3450 y(analysis.)164 1705 y Fb(13.5)70 b(Con)n(trol)31 b(of)i(storage)f
3451 (allo)r(cation)e(in)h(the)g(generated)355 1780 y(ev)l(aluator)164
3452 1872 y Fn(When)15 b(initializing)e(itself,)h(the)h(Ox-generated)g(ev)m
3453 (aluator)h(allo)q(cates)f(memory)e(for)i(its)164 1932
3454 y(v)m(arious)i(data)g(structures.)k(When)16 b(ev)m(aluating)g(a)g
3455 (large)g(input,)g(it)f(ma)o(y)g(happ)q(en)h(that)164
3456 1993 y(the)g(space)h(allo)q(cated)g(for)g(a)g(giv)o(en)f(data)h
3457 (structure)g(is)f(inadequate.)22 b(In)17 b(suc)o(h)f(a)h(case,)164
3458 2053 y(the)k(ev)m(aluator)g(issues)g(an)g(error)g(message)g(indicating)
3459 f(whic)o(h)g(data)i(structure)e(w)o(as)164 2113 y(exceeded)12
3460 b(and)j(suggesting)g(an)f(appropriately)g(larger)g(size.)20
3461 b(The)14 b(sizes)f(of)h(these)g(data)164 2173 y(structures)i(ma)o(y)f
3462 (b)q(e)h(determined)e(b)o(y)h(the)h(default)g(v)m(alues)g(built)g(in)o
3463 (to)g(Ox,)f(or)h(b)o(y)g(the)164 2233 y(ev)m(aluator)g(designer's)e
3464 (use)h(of)h(the)e Fd(-Y)p Fi(aN)20 b Fn(option)15 b(on)h(the)f(Ox)f
3465 (command)f(line,)h(where)164 2293 y Fi(a)g Fn(is)g(an)h(alphab)q(etic)f
3466 (c)o(haracter)f(that)i(sp)q(eci\014es)f(the)g(data)h(structure)f(to)g
3467 (b)q(e)h(sized,)e(and)164 2354 y Fi(N)18 b Fn(is)13 b(an)h(in)o(teger)e
3468 (that)h(determines)e(the)i(size)f(of)h(data)h(structure)f
3469 Fi(a)f Fn(\(see)h(app)q(endix)g(D\).)237 2414 y(The)23
3470 b(ev)m(aluator)h(designer)f(can)g(easily)g(build)f(an)i(ev)m(aluator)g
3471 (that)f(accepts)g(the)164 2474 y(same)c Fd(-Y)p Fi(aN)24
3472 b Fn(command-line)18 b(options)i(accepted)g(b)o(y)g(Ox:)28
3473 b(By)20 b(sp)q(ecifying)f(the)h Fd(-YY)p eop
3475 33 33 bop 164 162 a Fk(13)50 b(COMMAND-LINE)15 b(OPTIONS)h(AND)f(OTHER)
3476 h(POINTS)298 b Fn(33)164 307 y(option)19 b(on)g(Ox's)f(command)e(line,)
3477 i(Ox)g(is)g(instructed)g(to)h(declare)f(in)g(the)g(generated)164
3478 367 y(ev)m(aluator)h(a)h(function)e Fd(yyyCheckFo)o(rRe)o(siz)o(es)d
3479 Fn(that)20 b(can)f(read)g Fd(main)p Fn('s)e(argumen)o(ts)164
3480 428 y(\(i.e.,)11 b(the)h(command-line)d(options)k(passed)g(to)f(the)g
3481 (generated)g(ev)m(aluator\))g(and)h(adjust)164 488 y(sizes)18
3482 b(accordingly)l(.)29 b(When)19 b(using)g(the)g Fd(-YY)f
3483 Fn(option,)h(the)g(designer)g(should)g(arrange)164 548
3484 y(the)d(ev)m(aluator's)g Fd(main)f Fn(program)h(according)h(to)f(the)g
3485 (follo)o(wing)g(form:)237 592 y(.)237 608 y(.)237 625
3486 y(.)164 716 y Fa(void)21 b(yyyCheckForResize)o(s\(\);)237
3487 801 y Fn(.)237 817 y(.)237 834 y(.)164 925 y Fa(main\(argc,argv\))208
3488 975 y(int)g(argc;)208 1025 y(char)g(*argv[];)208 1075
3489 y({)237 1154 y Fn(.)237 1170 y(.)237 1187 y(.)229 1278
3490 y Fa(/*)h(This)f(is)g(executed)f(before)h(calling)f(yyparse)g(*/)229
3491 1328 y(yyyCheckForResizes\()o(argc,)o(argv\))o(;)237
3492 1413 y Fn(.)237 1429 y(.)237 1446 y(.)229 1537 y Fa(yyparse\(\);)237
3493 1622 y Fn(.)237 1638 y(.)237 1655 y(.)208 1746 y Fa(})h(/*)h(main)e(*/)
3494 164 1891 y Fb(13.6)70 b(P)n(arse)23 b(tree)f(statistics)164
3495 1983 y Fn(Placing)g Fd(-u)g Fn(on)h(Ox's)f(command)f(line)g(causes)i
3496 (generation)g(of)f(an)h(ev)m(aluator)g(that)164 2043
3497 y(prin)o(ts,)16 b(for)h(eac)o(h)f(input,)g(statistics)h(regarding)g
3498 (the)f(parse)h(tree)f(built)g(for)h(the)g(input.)164
3499 2103 y(These)f(include)f(n)o(um)o(b)q(ers)g(of:)237 2205
3500 y Fc(\017)24 b Fn(terminal)14 b(no)q(des)j(and)g(their)e(attribute)h
3501 (instances,)237 2307 y Fc(\017)24 b Fn(non)o(terminal)14
3502 b(no)q(des)j(and)g(their)f(attribute)g(instances,)164
3503 2409 y(and)h(other)f(statistics.)p eop
3505 34 34 bop 164 162 a Fk(14)50 b(EXAMPLE:)15 b(AN)h(INTEGER)g(CALCULA)l
3506 (TOR)513 b Fn(34)164 307 y Fb(13.7)70 b(Adjusting)23
3507 b(the)f(sizes)f(of)j(Ox's)f(data)g(structures)164 400
3508 y Fn(Ox)d(itself)f(calls)h(system)f(memory)e(allo)q(cation)k(routines)f
3509 (to)h(obtain)g(storage)g(for)g(its)164 460 y(in)o(ternal)15
3510 b(data)i(structures.)k(The)16 b(default)f(sizes)g(of)i(these)e(data)i
3511 (structures)f(are)g(quite)164 520 y(generous,)25 b(and)f(exceeding)e
3512 (them)g(w)o(ould)i(b)q(e)f(somewhat)g(un)o(usual.)43
3513 b(In)24 b(case)f(an)o(y)164 580 y(of)h(these)g(is)f(exceeded,)h(Ox)g
3514 (prin)o(ts)f(an)h(error)g(message)g(indicating)f(the)g(use)h(of)h(a)164
3515 640 y(command-line)12 b(option)j(of)f(the)h(form)e Fd(-X)p
3516 Fi(aN)19 b Fn(to)c(mak)o(e)d Fi(N)20 b Fn(the)14 b(size)g(of)h(data)g
3517 (structure)164 700 y Fi(a)p Fn(.)164 867 y Fo(14)83 b(Example:)36
3518 b(an)27 b(in)n(teger)g(calculator)164 976 y Fn(This)21
3519 b(section)g(has)i(Ox)e(co)q(de)g(for)h(an)g(ev)m(aluator)f(of)h(simple)
3520 d(expressions)j(in)o(v)o(olving)164 1037 y(m)o(ultiplic)o(ation)e(and)j
3521 (addition.)40 b(Since)22 b(the)g(grammar)f(has)i(only)f(syn)o(thesized)
3522 f(at-)164 1097 y(tributes,)g(the)g(Ox)g(implem)o(en)n(tation)e
3523 (o\013ers)j(little)d(adv)m(an)o(tage)j(o)o(v)o(er)e(one)h(that)h(uses)
3524 164 1157 y(only)16 b(Y)l(acc)g(and)g(Lex;)g(it)g(is)g(presen)o(ted)f
3525 (as)i(a)g(v)o(ery)e(easy)h(example)e(of)j(Ox)f(usage.)237
3526 1207 y(The)d(L-\014le)f(sp)q(eci\014es)h(that)g(the)f(tok)o(ens)h(are)f
3527 (digit)g(strings,)i(paren)o(theses,)f Fd('*')p Fn(,)e(and)164
3528 1257 y Fd('+')p Fn(:)164 1348 y Fa(\045{)164 1398 y(/*)21
3529 b(expr.L:)42 b(L-file)21 b(for)g(a)h(simple)e(expression)g(language)g
3530 (*/)164 1448 y(#include)g("y.tab.h")164 1497 y(#include)g("oxout.h")164
3531 1547 y(\045})164 1647 y(\045\045)164 1697 y([)i(\\n\\t\\f]*)107
3532 b(;)164 1746 y([0-9]+)195 b(return\(CONST\);)19 b(@{)556
3533 1796 y(sscanf\(yytext,"\045d",)o(&\(@C)o(ONST.)o(val@\))o(\);)g(@})164
3534 1846 y(\\\()283 b(return\('\('\);)164 1896 y(\\\))g(return\('\)'\);)164
3535 1946 y(\\+)g(return\('+'\);)164 1996 y(\\*)g(return\('*'\);)164
3536 2045 y(\045\045)p eop
3538 35 35 bop 164 162 a Fk(14)50 b(EXAMPLE:)15 b(AN)h(INTEGER)g(CALCULA)l
3539 (TOR)513 b Fn(35)237 307 y(The)22 b(grammar)e(is)h(disam)o(biguated)g
3540 (b)o(y)g(use)h(of)g(Y)l(acc's)f Fd(\045left)f Fn(reserv)o(ed)g(w)o
3541 (ord.)164 357 y(Eac)o(h)k(parse-tree)g(no)q(de)h(lab)q(eled)f(b)o(y)g
3542 Fd(s)p Fn(,)h Fd(e)p Fn(,)g(or)g Fd(CONST)d Fn(has)j(an)g(in)o(teger)e
3543 (attribute)164 407 y(instance)14 b(named)e Fd(val)p Fn(.)20
3544 b(Use)13 b(of)h(the)g(global)g(v)m(ariable)g Fd(sVal)e
3545 Fn(ob)o(viates)i(p)q(ostdecoration)164 457 y(tra)o(v)o(ersal.)164
3546 548 y Fa(/*)21 b(expr.Y:)42 b(Y-file)21 b(for)g(a)h(simple)e
3547 (expression)g(language)g(*/)164 598 y(\045left)h('+')164
3548 648 y(\045left)g('*')164 697 y(\045token)g(CONST)164
3549 797 y(@attributes)e({long)i(val;})g(s)h(e)f(CONST)164
3550 897 y(\045{)164 946 y(#include)f("oxout.h")164 996 y(long)h(sVal;)164
3551 1046 y(\045})164 1146 y(\045\045)164 1196 y(s)152 b(:)h(e)338
3552 1245 y(@{)22 b(@i)f(sVal)g(=)h(@s.val@)e(=)i(@e.val@;)259
3553 b(@})338 1295 y(;)164 1345 y(e)152 b(:)h(e)f('+')108
3554 b(e)338 1395 y(@{)22 b(@i)f(@e.0.val@)f(=)i(@e.1.val@)e(+)h(@e.2.val@;)
3555 63 b(@})338 1445 y(;)164 1494 y(e)152 b(:)h(e)f('*')108
3556 b(e)338 1544 y(@{)22 b(@i)f(@e.0.val@)f(=)i(@e.1.val@)e(*)h(@e.2.val@;)
3557 63 b(@})338 1594 y(;)164 1644 y(e)152 b(:)h('\(')108
3558 b(e)152 b('\)')338 1694 y(@{)22 b(@i)f(@e.val@)f(=)i(@e.1.val@;)368
3559 b(@})338 1743 y(;)164 1793 y(e)152 b(:)h(CONST)338 1843
3560 y(@{)22 b(@i)f(@e.val@)f(=)i(@CONST.val@;)324 b(@})338
3561 1893 y(;)164 1943 y(\045\045)164 2042 y(main\(\))164
3562 2092 y({yyparse\(\);)186 2142 y(printf\("\045d\\n",sV)o(al\);)164
3565 36 36 bop 164 162 a Fk(15)50 b(EXAMPLE:)15 b(A)h(BINAR)l(Y)e(NUMBER)h
3566 (TRANSLA)l(TOR)350 b Fn(36)237 307 y(The)15 b(follo)o(wing)f(command)f
3567 (sequence)g(is)h(used)h(to)g(build)f(an)h(executable)e(\014le)h
3568 Fd(calc)164 357 y Fn(from)h(the)h(ab)q(o)o(v)o(e)g(sp)q
3569 (eci\014cations:)338 448 y Fa(ox)22 b(-h)f(expr.Y)g(expr.L)338
3570 498 y(yacc)g(-d)h(oxout.y)338 548 y(lex)f(oxout.l)338
3571 598 y(cc)h(-c)f(y.tab.c)338 648 y(cc)h(-c)f(lex.yy.c)338
3572 697 y(cc)h(-o)f(calc)g(y.tab.o)f(lex.yy.o)h(-ly)g(-ll)164
3573 864 y Fo(15)83 b(Example:)36 b(a)27 b(binary)g(n)n(um)n(b)r(er)f
3574 (translator)164 973 y Fn(This)f(illustrates)f(the)h(use)g(of)g(Ox)g(to)
3575 g(build)g(an)g(ev)m(aluator)h(based)f(on)h(an)f(exam-)164
3576 1033 y(ple)c(attribute)g(grammar)42 b(that)22 b(app)q(ears)h(in)e(the)g
3577 (seminal)f(pap)q(er)i(on)g(the)g(sub)s(ject)164 1094
3578 y([Kn)o(uth)16 b(68].)33 b(The)20 b(input)h(\(after)f(remo)o(v)m(al)e
3579 (of)j(whitespace\))f(is)g(either)f(a)i(nonempt)o(y)164
3580 1154 y(string)16 b(of)g(binary)g(digits)g(or)g(t)o(w)o(o)g(suc)o(h)f
3581 (strings)i(separated)f(b)o(y)f(a)i(p)q(erio)q(d.)k(This)16
3582 b(input)164 1214 y(is)f(in)o(terpreted)e(as)i(a)h(binary)e(represen)o
3583 (tation)h(of)g(a)g(\015oating)h(p)q(oin)o(t)f(n)o(um)o(b)q(er,)e(whic)o
3584 (h)h(is)164 1274 y(then)i(prin)o(ted)f(on)i(the)f(standard)i(output)f
3585 (in)e(its)h(base-ten)h(form.)237 1324 y(F)l(ollo)o(wing)f(is)g(the)g
3586 (text)g(of)g(the)g(L-\014le:)164 1415 y Fa(\045{)164
3587 1465 y(#include)k("y.tab.h")164 1515 y(\045})164 1615
3588 y(\045\045)164 1664 y([0])261 b(return)20 b(ZERO;)164
3589 1714 y([1])261 b(return)20 b(ONE;)164 1764 y(\\.)283
3590 b(return)20 b(DOT;)164 1814 y([\\n\\t\\v)g(])131 b(;)164
3591 1864 y(.)305 b({fprintf\(stderr,")o(illeg)o(al)19 b(character\\n"\);)
3592 513 1914 y(exit\(-1\);)491 1963 y(})p eop
3594 37 37 bop 164 162 a Fk(15)50 b(EXAMPLE:)15 b(A)h(BINAR)l(Y)e(NUMBER)h
3595 (TRANSLA)l(TOR)350 b Fn(37)237 307 y(Here)15 b(is)h(the)g(text)g(of)g
3596 (the)g(Y-\014le:)164 399 y Fa(\045token)21 b(ZERO)f(ONE)i(DOT)164
3597 498 y(@attributes)d({float)i(value;)g(int)g(scale;})412
3598 b(bit)164 548 y(@attributes)19 b({float)i(value;)g(int)g
3599 (scale,length;})258 b(bitlist)164 598 y(@attributes)19
3600 b({float)i(value;})652 b(num)164 697 y(\045start)21 b(num)164
3601 797 y(\045{)164 847 y(#include)f(<stdio.h>)164 897 y(float)h(numValue;)
3602 164 946 y(\045})p eop
3604 38 38 bop 164 162 a Fk(15)50 b(EXAMPLE:)15 b(A)h(BINAR)l(Y)e(NUMBER)h
3605 (TRANSLA)l(TOR)350 b Fn(38)164 307 y Fa(\045\045)164
3606 357 y(bit)108 b(:)153 b(ZERO)513 407 y(@{)21 b(@i)g(@bit.value@)f(=)i
3607 (0;)578 457 y(/*)f(value)g(is)h(synthesized)d(for)i(bit.)43
3608 b(*/)578 506 y(/*)21 b(scale)g(is)h(inherited)d(for)j(bit.)86
3609 b(*/)513 556 y(@})338 606 y(;)164 706 y(bit)108 b(:)153
3610 b(ONE)513 756 y(@{)21 b(@i)g(@bit.value@)f(=)i(twoToThe\(@bit.s)o
3611 (cale@)o(\);)513 805 y(@})338 855 y(;)164 955 y(bitlist)e(:)153
3612 b(bit)513 1005 y(@{)21 b(@i)g(@bitlist.value@)e(=)j(@bit.value@;)578
3613 1054 y(@i)f(@bit.scale@)f(=)i(@bitlist.scale@)o(;)578
3614 1104 y(@i)f(@bitlist.length@)e(=)i(1;)578 1154 y(/*)g(value)g(and)g
3615 (length)g(are)g(synthesized)f(for)h(bitlist.)42 b(*/)578
3616 1204 y(/*)21 b(scale)g(is)h(inherited)d(for)j(bitlist.)347
3617 b(*/)513 1254 y(@})338 1353 y(|)153 b(bitlist)20 b(bit)513
3618 1403 y(@{)h(@i)g(@bitlist.0.value@)e(=)i(@bitlist.1.value@)e(+)i
3619 (@bit.value@;)578 1453 y(@i)g(@bit.scale@)f(=)i(@bitlist.0.scal)o(e@;)
3620 578 1503 y(@i)f(@bitlist.1.scale@)e(=)i(@bitlist.0.scale@)e(+)i(1;)578
3621 1553 y(@i)g(@bitlist.0.length@)d(=)k(@bitlist.1.length@)c(+)k(1;)513
3622 1602 y(@})338 1652 y(;)164 1752 y(num)108 b(:)153 b(bitlist)513
3623 1802 y(@{)21 b(@i)g(numValue)g(=)g(@num.value@)f(=)h
3624 (@bitlist.0.value@;)578 1851 y(@i)g(@bitlist.scale@)e(=)j(0;)578
3625 1901 y(/*)f(value)g(is)h(synthesized)d(for)i(num.)g(*/)513
3626 1951 y(@})338 2051 y(|)153 b(bitlist)20 b(DOT)108 b(bitlist)513
3627 2100 y(@{)21 b(@i)g(numValue)g(=)g(@num.value@)f(=)709
3628 2150 y(@bitlist.0.value)o(@)f(+)j(@bitlist.1.value)o(@;)578
3629 2200 y(@i)f(@bitlist.0.scale@)e(=)i(0;)578 2250 y(@i)g
3630 (@bitlist.1.scale@)e(=)i(-)h(@bitlist.1.length)o(@;)513
3631 2300 y(@})338 2350 y(;)164 2399 y(\045\045)p eop
3633 39 39 bop 164 162 a Fk(15)50 b(EXAMPLE:)15 b(A)h(BINAR)l(Y)e(NUMBER)h
3634 (TRANSLA)l(TOR)350 b Fn(39)164 307 y Fa(main\(\))208
3635 357 y({if)21 b(\(!\(yyparse\(\)\)\))295 407 y(printf\("\04530.15f\\)o
3636 (n",nu)o(mValu)o(e\);)208 457 y(})164 656 y(float)g(twoToThe\(in\))281
3637 b(/*)21 b(returns)f(2)i(raised)e(to)i(the)f(power)g(in)g(*/)208
3638 706 y(int)g(in;)208 756 y({if)g(\(in)g(<)g(0\))h(return)e(\(1.0)h(/)h
3639 (twoToThe\(-in\)\);)229 805 y(if)g(\(in)f(==)g(0\))h(return)e(1.0;)295
3640 855 y(else)h(return)f(\(2.0)h(*)h(twoToThe\(in)d(-)j(1\)\);)208
3641 905 y(})237 1169 y Fn(Construction)16 b(of)g(the)f(ab)q(o)o(v)o(e)g(ev)
3642 m(aluator)h(follo)o(ws)g(the)f(separate)g(compilation)f(ap-)164
3643 1229 y(proac)o(h)i(describ)q(ed)g(in)g(section)g(12.)237
3644 1289 y(Remo)o(ving)e(the)h(Ox-sp)q(eci\014c)f(constructs)i(and)g(the)f
3645 Fd(printf)e Fn(statemen)o(t)h(from)g(the)164 1349 y(ab)q(o)o(v)o(e)i
3646 (source)g(yields)f(a)h(pair)g(of)g(\014les)g(that)g(constitute)g(a)g
3647 (seman)o(tics-free)e(recognizer)164 1409 y(of)j(binary)f(n)o(um)o(b)q
3650 40 40 bop 164 162 a Fk(16)50 b(EXAMPLE:)15 b(TRANSLA)l(TION)g(TO)i
3651 (POSTFIX)e(AND)h(PREFIX)176 b Fn(40)164 315 y Fo(16)83
3652 b(Example:)34 b(translation)25 b(to)g(p)r(ost\014x)f(and)h(pre-)329
3653 407 y(\014x)164 516 y Fn(In)20 b(this)g(example,)f(the)h(generated)g
3654 (ev)m(aluator)h(is)f(to)g(p)q(erform)g(t)o(w)o(o)g(p)q(ostdecoration)
3655 164 577 y(tra)o(v)o(ersals,)f(one)h(for)g(prin)o(ting)f(the)g(pre\014x)
3656 g(form)f(of)i(a)g(giv)o(en)f(in\014x)g(expression,)g(and)164
3657 637 y(one)g(for)g(prin)o(ting)f(the)g(p)q(ost\014x)i(form.)27
3658 b(The)19 b(tok)o(ens)g(of)g(the)f(language)i(are)e(sp)q(eci\014ed)164
3659 697 y(as)f(follo)o(ws:)164 801 y Fa(\045{)164 850 y(/*)k(L-file)g(for)g
3660 (translation)f(of)h(infix)g(expressions)e(*/)164 900
3661 y(#include)h("y.tab.h")164 950 y(#include)g("oxout.h")164
3662 1050 y(char)h(*lexeme\(\))208 1100 y({char)f(*dum;)229
3663 1149 y(dum)i(=)f(\(char)g(*\)malloc\(yyleng+1)o(\);)229
3664 1199 y(strcpy\(dum,yytext\);)229 1249 y(return)g(dum;)208
3665 1299 y(})164 1398 y(\045})164 1498 y(\045\045)164 1548
3666 y([)h(\\n\\t\\f]*)303 b(;)164 1598 y([0-9]+\\.?[0-9]*)193
3667 b(return\(CONST\);)19 b(@{)i(@CONST.lexeme@)e(=)j(lexeme\(\);)e(@})164
3668 1648 y([A-Za-z_][A-Za-z_)o(0-9]*)40 b(return\(ID\);)85
3669 b(@{)21 b(@ID.lexeme@)f(=)h(lexeme\(\);)86 b(@})164 1697
3670 y(\\\()479 b(return\('\('\);)164 1747 y(\\\))g(return\('\)'\);)164
3671 1797 y(\\+)g(return\('+'\);)164 1847 y(\\*)g(return\('*'\);)164
3672 1897 y(\\/)g(return\('/'\);)164 1946 y(\\-)g(return\('-'\);)164
3673 1996 y(\045\045)p eop
3675 41 41 bop 164 162 a Fk(16)50 b(EXAMPLE:)15 b(TRANSLA)l(TION)g(TO)i
3676 (POSTFIX)e(AND)h(PREFIX)176 b Fn(41)237 307 y(The)18
3677 b(\014rst)h(tra)o(v)o(ersal)e(p)q(erformed)g(is)h(named)f
3678 Fd(LRpre)p Fn(,)g(and)i(the)f(second)g(is)g(named)164
3679 367 y Fd(LRpost)p Fn(.)23 b(By)16 b(default,)h(b)q(oth)i(are)e
3680 (left-to-righ)o(t)g(tra)o(v)o(ersals.)24 b Fd(LRpost)16
3681 b Fn(is)h(a)h(p)q(ostorder)164 428 y(tra)o(v)o(ersal)d(b)o(y)h
3682 (default.)21 b Fd(LRpre)14 b Fn(is)j(sp)q(eci\014ed)e(as)i(a)g
3683 (preorder)f(tra)o(v)o(ersal.)164 581 y Fa(/*)21 b(Y-file)g(for)g
3684 (translation)f(of)h(infix)g(expressions)e(to)j(prefix)e(and)h(postfix)g
3685 (*/)164 631 y(\045token)g(ID)g(CONST)164 681 y(\045start)g(s)164
3686 731 y(\045left)g('+')g('-')164 780 y(\045left)g('*')g('/')164
3687 880 y(@attributes)e({char)i(*lexeme;})f(ID)i(CONST)164
3688 930 y(@traversal)e(@preorder)g(LRpre)164 980 y(@traversal)g(LRpost)164
3689 1079 y(\045{)164 1129 y(#include)g("oxout.h")164 1179
3690 y(#include)g(<stdio.h>)164 1229 y(\045})p eop
3692 42 42 bop 164 162 a Fk(16)50 b(EXAMPLE:)15 b(TRANSLA)l(TION)g(TO)i
3693 (POSTFIX)e(AND)h(PREFIX)176 b Fn(42)164 307 y Fa(\045\045)164
3694 357 y(s)152 b(:)h(expr)513 407 y(@{)21 b(@LRpost)f(printf\("\\n"\);)578
3695 457 y(@LRpost)g(@revorder)g(\(1\))h(printf\("postfix:)41
3696 b("\);)578 506 y(@LRpre)h(@revorder)20 b(\(1\))h(printf\("\\n"\);)578
3697 556 y(@LRpre)42 b(printf\("prefix:)63 b("\);)513 606
3698 y(@})164 656 y(expr)86 b(:)153 b(expr)86 b('*')108 b(expr)513
3699 706 y(@{)21 b(@LRpost)f(printf\(")h(*)g("\);)578 756
3700 y(@LRpre)42 b(printf\(")21 b(*)g("\);)513 805 y(@})338
3701 855 y(|)153 b(expr)86 b('+')108 b(expr)513 905 y(@{)21
3702 b(@LRpre)42 b(printf\(")21 b(+)g("\);)578 955 y(@LRpost)f(printf\(")h
3703 (+)g("\);)513 1005 y(@})338 1054 y(|)153 b(expr)86 b('/')108
3704 b(expr)513 1104 y(@{)21 b(@LRpost)f(printf\(")h(/)g("\);)578
3705 1154 y(@LRpre)42 b(printf\(")21 b(/)g("\);)513 1204 y(@})338
3706 1254 y(|)153 b(expr)86 b('-')108 b(expr)513 1303 y(@{)21
3707 b(@LRpost)f(printf\(")h(-)g("\);)578 1353 y(@LRpre)42
3708 b(printf\(")21 b(-)g("\);)513 1403 y(@})338 1453 y(|)153
3709 b('\(')108 b(expr)86 b('\)')338 1503 y(|)153 b(ID)513
3710 1553 y(@{)21 b(@LRpost)f(printf\(")h(\045s)g(",@ID.lexeme@\);)578
3711 1602 y(@LRpre)42 b(printf\(")21 b(\045s)g(",@ID.lexeme@\);)513
3712 1652 y(@})338 1702 y(|)153 b(CONST)513 1752 y(@{)21 b(@LRpost)f
3713 (printf\(")h(\045s)g(",@CONST.lexeme@\))o(;)578 1802
3714 y(@LRpre)42 b(printf\(")21 b(\045s)g(",@CONST.lexeme@\))o(;)513
3715 1851 y(@})338 1901 y(;)164 1951 y(\045\045)164 2100 y(main\(\))208
3716 2150 y({yyparse\(\);)208 2200 y(})p eop
3718 43 43 bop 164 162 a Fk(A)48 b(USING)16 b(O)o(X)k(WITH)c(NON-LEX)21
3719 b(LEXICAL)16 b(ANAL)l(YZERS)277 b Fn(43)164 315 y Fo(A)83
3720 b(Using)27 b(Ox)g(with)g(non-Lex)g(lexical)f(analyzers)164
3721 440 y Fb(A.1)69 b(Default)30 b(con)n(text-sensitivi)o(t)n(y)e(of)j
3722 (L-\014le)f(prepro)r(cess-)338 514 y(ing)164 607 y Fn(Unless)18
3723 b(instructed)h(otherwise,)g(Ox)g(searc)o(hes)f(eac)o(h)h(L-\014le)g
3724 (for)g Fd(return)e Fn(statemen)o(ts)164 667 y(in)g(the)g(con)o(text)g
3725 (of)h(C-co)q(ded)g(Lex)f(actions.)25 b(Since)17 b(the)g(string)h
3726 Fd(return)d Fn(m)o(ust)h(b)q(e)i(ig-)164 727 y(nored)e(outside)f(of)h
3727 (that)g(con)o(text)f(\(for)g(instance,)g(in)g(a)h(Lex)g(regular)f
3728 (expression\),)g(the)164 787 y(default)k(b)q(eha)o(vior)h(of)g
3729 (Ox-prepro)q(cessing)g(is)f(to)h(assume)f(that)h(the)g(L-\014le)g
3730 (conforms)164 847 y(to)h(the)g(syn)o(tax)g(of)g(a)g(\(p)q(ossibly)g
3731 (Ox-augmen)o(ted\))f(Lex)g(\014le.)35 b(Th)o(us)21 b(Ox)g(recognizes)
3732 164 908 y(the)15 b(three)h Fd(return)d Fn(statemen)o(ts)h(in)i(the)f
3733 (follo)o(wing)g(\(unaugmen)o(ted\))g(fragmen)o(t)f(of)i(an)164
3734 968 y(L-\014le:)237 1062 y(.)237 1078 y(.)237 1095 y(.)164
3735 1184 y Fd(renames)74 b(return\(TK_R)o(ENA)o(ME)o(S\);)164
3736 1244 y(return)100 b(return\(TK_R)o(ETU)o(RN)o(\);)164
3737 1305 y(reverse)74 b(return\(TK_R)o(EVE)o(RS)o(E\);)237
3738 1375 y Fn(.)237 1391 y(.)237 1408 y(.)164 1528 y(as)24
3739 b(p)q(oin)o(ts)g(of)g Fd(return)d Fn(of)j(tok)o(ens)g(b)o(y)f
3740 Fd(yylex)p Fn(.)41 b(Ox's)23 b(sensitivit)o(y)e(to)j(the)g(con)o(text)
3741 164 1588 y(of)16 b(the)g(string)g Fd(return)d Fn(in)j(the)f(second)h
3742 (Lex)g(regular)f(expression)h(ab)q(o)o(v)o(e)g(prev)o(en)o(ts)e(its)164
3743 1648 y(erroneous)j(recognition)f(as)h(a)f(p)q(oin)o(t)h(of)f
3744 Fd(return)e Fn(from)h(the)h(lexical)f(analyzer.)164 1791
3745 y Fb(A.2)69 b(Ox-prepro)r(cessing)23 b(of)g(C-co)r(ded)f(lexical)e
3746 (analyzers)164 1883 y Fn(Ox)h(alw)o(a)o(ys)g(ignores)h(the)f(string)g
3747 Fd(return)e Fn(in)i(the)g(con)o(text)f(of)i(C/C++)g(commen)o(ts)164
3748 1943 y(and)g(string)g(constan)o(ts.)39 b(When)21 b(giv)o(en)g(the)h
3749 Fd(-G)f Fn(command-line)d(option)23 b(preceding)164 2003
3750 y(the)18 b(name)f(of)h(an)h(L-\014le,)f(it)g(ignores)g
3751 Fd(return)e Fg(only)j Fn(in)f(those)g(con)o(texts.)27
3752 b(Th)o(us)18 b(a)h(\014le)164 2064 y(con)o(taining)13
3753 b(C/C++)h(co)q(de)g(ma)o(y)e(b)q(e)i(augmen)o(ted)e(with)h(attribute)g
3754 (reference)f(sections)164 2124 y(and)21 b(input)g(to)g(Ox)g(as)g(an)g
3755 (L-\014le.)35 b(The)21 b(o)q(ccurrences)f(of)h(the)g(string)g
3756 Fd(return)d Fn(m)o(ust)164 2184 y(coincide)d(exactly)g(with)h
3757 Fd(return)p Fn(s)e(of)j(tok)o(ens.)164 2312 y Fj(A.2.1)55
3758 b(Example)164 2404 y Fn(Supp)q(ose)17 b(it)e(is)h(desired)f(to)h(con)o
3759 (v)o(ert)e(to)i(Ox)g(a)g(translator)h(that)f(uses)g(the)f(follo)o(wing)
3760 h(C)164 2464 y(co)q(de)g(for)h(its)f(lexical)e(analyzer:)p
3763 44 44 bop 164 162 a Fk(A)48 b(USING)16 b(O)o(X)k(WITH)c(NON-LEX)21
3764 b(LEXICAL)16 b(ANAL)l(YZERS)277 b Fn(44)164 307 y Fa(#include)20
3765 b(<stdio.h>)164 357 y(#include)g(<string.h>)164 407 y(#include)g
3766 ("y.tab.h")164 506 y(#define)g(bufsize)h(80)164 556 y(char)g
3767 (buf[bufsize];)164 606 y(char)g(*lexBuf;)164 706 y(char)g
3768 (*lexeme\(inString\))208 756 y(char)g(inString[];)208
3769 805 y({return)f(strcpy\(\(char)f(*\)malloc\(1+strlen\()o(inStr)o
3770 (ing\)\))o(,inSt)o(ring\))o(;})164 905 y(int)i(yylex\(\))208
3771 955 y({char)f(*bufp)h(=)h(buf;)229 1054 y(while)f(\(\(*bufp)f(=)i
3772 (getchar\(\)\))e(!=)h(EOF\))273 1104 y({if)g(\(bufp)g(==)g(\(buf)g(+)h
3773 (bufsize)e(-)i(1\)\))360 1154 y({fprintf\(stderr,"e)o(xceed)o(ed)d
3774 (buffer\\n"\);)g(exit\(-1\);})295 1204 y(if)i(\(\(*bufp)f(==)i(')f('\))
3775 44 b(||)21 b(\(*bufp)g(==)g('\\n'\))g(||)382 1254 y(\(*bufp)f(==)i
3776 ('\\t'\))f(||)g(\(*bufp)g(==)g('\\f'\))360 1303 y(\))360
3777 1353 y({if)g(\(bufp)g(==)g(buf\))g(continue;)f(else)h(break;})295
3778 1403 y(if)g(\(!isalnum\(*bufp\)\))d({fprintf\(stderr,"il)o(legal)g
3779 (character\\n"\);)h(exit\(-1\);})295 1453 y(bufp++;)273
3780 1503 y(})229 1553 y(if)j(\(bufp)e(!=)i(buf\))295 1602
3781 y({*++bufp)e(=)h('\\0';)317 1652 y(lexBuf)f(=)i(lexeme\(buf\);)317
3782 1702 y(bufp)e(=)i(lexBuf;)317 1752 y(if)f(\(isalpha\(lexBuf[0)o(]\)\))
3783 382 1802 y({while)f(\(*bufp)h(!=)g('\\0'\))447 1851 y(if)h
3784 (\(isdigit\(*bufp++)o(\)\))513 1901 y({fprintf\(stderr,)o("ille)o(gal)c
3785 (string\\n"\);)i(exit\(-1\);})404 1951 y(return)g(\(IDENT\);)382
3786 2001 y(})317 2051 y(if)h(\(isdigit\(lexBuf[0)o(]\)\))382
3787 2100 y({while)f(\(*bufp)h(!=)g('\\0'\))447 2150 y(if)h
3788 (\(isalpha\(*bufp++)o(\)\))513 2200 y({fprintf\(stderr,)o("ille)o(gal)c
3789 (string\\n"\);)i(exit\(-1\);})404 2250 y(return)g(\(ICONST\);)382
3790 2300 y(})295 2350 y(})229 2399 y(return)h(0;)208 2449
3793 45 45 bop 164 162 a Fk(A)48 b(USING)16 b(O)o(X)k(WITH)c(NON-LEX)21
3794 b(LEXICAL)16 b(ANAL)l(YZERS)277 b Fn(45)237 307 y(The)18
3795 b(C)g(reserv)o(ed)e(w)o(ord)i Fd(return)e Fn(o)q(ccurs)i(in)f(the)g
3796 (\014le)g(exactly)g(four)h(times.)24 b(Only)164 367 y(t)o(w)o(o)17
3797 b(of)g(these)g(o)q(ccurrences)g(corresp)q(ond)h(to)f
3798 Fd(return)p Fn(s)e(of)j(tok)o(ens)f(b)o(y)f(the)h(lexical)e(an-)164
3799 428 y(alyzer.)26 b(The)18 b(approac)o(h)h(is)f(to)h(excise)d(from)h
3800 (the)h(\014le)g(a)g(section)g(of)h(co)q(de)f(con)o(taining)164
3801 488 y(those)i(t)o(w)o(o)f(o)q(ccurrences)g(\(and)h(no)f(others\),)h
3802 (place)f(that)h(co)q(de)f(section)g(it)g(in)g(a)h(sep-)164
3803 548 y(arate)g(\014le,)f(and)h(submit)e(the)i(new)f(\014le)g(to)h(Ox)f
3804 (as)h(a)g(non-Lex)g(L-\014le,)g(b)o(y)f(using)h(the)164
3805 608 y Fd(-G)15 b Fn(option.)22 b(Ox)15 b(translates)h(the)g(new)g
3806 (\014le)f(and)h(places)f(it)h(on)g Fd(oxout.l)p Fn(.)i(The)e(excised)
3807 164 668 y(co)q(de)g(is)g(replaced)g(in)g(the)g(original)g(\014le)f(b)o
3808 (y)h(the)g(line:)292 770 y Fd(#include)23 b("oxout.l")237
3809 872 y Fn(Here)17 b(is)g(the)g(L-\014le,)h(whic)o(h)f(has)h(b)q(een)g
3810 (augmen)o(ted)e(b)o(y)h(t)o(w)o(o)g(attribute)h(reference)164
3811 932 y(sections:)317 1036 y Fa(if)j(\(isalpha\(lexBuf[0)o(]\)\))382
3812 1086 y({while)f(\(*bufp)h(!=)g('\\0'\))447 1135 y(if)h
3813 (\(isdigit\(*bufp++)o(\)\))513 1185 y({fprintf\(stderr,)o("ille)o(gal)c
3814 (string\\n"\);)i(exit\(-1\);})404 1235 y(return)g(\(IDENT\);)42
3815 b(@{)22 b(@IDENT.string@)c(=)k(lexBuf;)e(@})382 1285
3816 y(})317 1335 y(if)h(\(isdigit\(lexBuf[0)o(]\)\))382 1384
3817 y({while)f(\(*bufp)h(!=)g('\\0'\))447 1434 y(if)h(\(isalpha\(*bufp++)o
3818 (\)\))513 1484 y({fprintf\(stderr,)o("ille)o(gal)c(string\\n"\);)i
3819 (exit\(-1\);})404 1534 y(return)g(\(ICONST\);)g(@{)i(@ICONST.string@)c
3820 (=)k(lexBuf;)e(@})382 1584 y(})237 1698 y Fn(Here)12
3821 b(is)i(the)f(sk)o(eleton)f(of)i(the)f(lexical)e(analyzer,)i(whic)o(h)g
3822 (no)o(w)h Fd(#include)p Fn(s)c(the)j(\014les)164 1758
3823 y Fd(oxout.h)h Fn(and)i Fd(oxout.l)p Fn(:)p eop
3825 46 46 bop 164 162 a Fk(A)48 b(USING)16 b(O)o(X)k(WITH)c(NON-LEX)21
3826 b(LEXICAL)16 b(ANAL)l(YZERS)277 b Fn(46)164 307 y Fa(#include)20
3827 b(<stdio.h>)164 357 y(#include)g(<string.h>)164 407 y(#include)g
3828 ("y.tab.h")164 457 y(#include)g("oxout.h")164 556 y(#define)g(bufsize)h
3829 (80)164 606 y(char)g(buf[bufsize];)164 656 y(char)g(*lexBuf;)164
3830 756 y(char)g(*lexeme\(inString\))208 805 y(char)g(inString[];)208
3831 855 y({return)f(strcpy\(\(char)f(*\)malloc\(1+strlen\()o(inStr)o
3832 (ing\)\))o(,inSt)o(ring\))o(;})164 955 y(int)i(yylex\(\))208
3833 1005 y({char)f(*bufp)h(=)h(buf;)229 1104 y(while)f(\(\(*bufp)f(=)i
3834 (getchar\(\)\))e(!=)h(EOF\))273 1154 y({if)g(\(bufp)g(==)g(\(buf)g(+)h
3835 (bufsize)e(-)i(1\)\))360 1204 y({fprintf\(stderr,"e)o(xceed)o(ed)d
3836 (buffer\\n"\);)g(exit\(-1\);})295 1254 y(if)i(\(\(*bufp)f(==)i(')f('\))
3837 44 b(||)21 b(\(*bufp)g(==)g('\\n'\))g(||)382 1303 y(\(*bufp)f(==)i
3838 ('\\t'\))f(||)g(\(*bufp)g(==)g('\\f'\))360 1353 y(\))360
3839 1403 y({if)g(\(bufp)g(==)g(buf\))g(continue;)f(else)h(break;})295
3840 1453 y(if)g(\(!isalnum\(*bufp\)\))d({fprintf\(stderr,"il)o(legal)g
3841 (character\\n"\);)h(exit\(-1\);})295 1503 y(bufp++;)273
3842 1553 y(})229 1602 y(if)j(\(bufp)e(!=)i(buf\))295 1652
3843 y({*++bufp)e(=)h('\\0';)317 1702 y(lexBuf)f(=)i(lexeme\(buf\);)317
3844 1752 y(bufp)e(=)i(lexBuf;)164 1851 y(#include)e("oxout.l")295
3845 1951 y(})229 2001 y(return)h(0;)208 2051 y(})p eop
3847 47 47 bop 164 162 a Fk(B)48 b(TRA)-5 b(VERSAL)16 b(SEMANTICS)874
3848 b Fn(47)164 315 y Fo(B)82 b(T)-7 b(ra)n(v)n(ersal)27
3849 b(seman)n(tics)164 425 y Fn(The)16 b(b)q(eha)o(vior)g(of)g(p)q
3850 (ostdecoration)i(tra)o(v)o(ersals)d(w)o(as)i(illustrated)e(in)h(the)g
3851 (examples)e(of)164 485 y(section)d(9.2.)20 b(In)11 b(view)g(of)g(those)
3852 h(examples,)e(the)h(C-lik)o(e)f(pseudo)q(co)q(de)j(in)e(this)g(app)q
3853 (endix)164 545 y(holds)h(no)h(surprises,)f(but)g(describ)q(es)g(suc)o
3854 (h)g(b)q(eha)o(vior)g(somewhat)f(more)g(formally)l(.)18
3855 b(The)164 606 y(tra)o(v)o(ersals)d(are)i(carried)e(out)h(b)o(y)g(a)g
3856 (single)g(call)f(of)i Fd(doTravers)o(als)12 b Fn(\(b)q(elo)o(w\))k
3857 (after)g(the)164 666 y(\014nal)g(decoration.)164 770
3858 y Fa(enum)21 b(orderType)f({PREORDER,POSTORD)o(ER};)164
3859 819 y(enum)h(directionType)e({LEFTTORIGHT,RIGHT)o(TOLE)o(FT};)164
3860 1019 y(enum)i(orderType)f(staticOrder\(trave)o(rsal)e(T\))208
3861 1068 y({if)j(\(@preorder)e(appears)i(in)g(the)g(traversal)f
3862 (specification)f(of)j(T\))317 1118 y(return)e(PREORDER;)229
3863 1168 y(return)h(POSTORDER;)208 1218 y(})164 1417 y(enum)g
3864 (directionType)e(staticDirection\(tr)o(aver)o(sal)g(T\))208
3865 1467 y({if)i(\(@righttoleft)e(appears)h(in)i(the)f(traversal)f
3866 (specification)f(of)i(T\))317 1517 y(return)f(RIGHTTOLEFT;)229
3867 1567 y(return)h(LEFTTORIGHT;)208 1616 y(})164 1816 y(int)g
3868 (isDisabled\(travers)o(al)e(T\))208 1865 y({if)i(\(@disable)f(appears)g
3869 (in)h(the)h(traversal)d(specification)h(of)h(T\))317
3870 1915 y(return)f(1;)229 1965 y(return)h(0;)208 2015 y(})p
3873 48 48 bop 164 162 a Fk(B)48 b(TRA)-5 b(VERSAL)16 b(SEMANTICS)874
3874 b Fn(48)164 307 y Fa(void)21 b(pdTrav\(parse_tree)o(_node)d(N,)k
3875 (traversal)d(T\))208 357 y({grammar_rule)g(R;)261 b(/*)21
3876 b(the)g(rule)g(applied)g(at)g(N)h(*/)229 407 y(enum)f(orderType)f
3877 (order[Z];)64 b(/*)43 b(Z)g(>=)g(#)22 b(of)f(traversal)f(action)h
3878 (specs)1057 457 y(for)h(T)f(in)h(R)43 b(*/)229 506 y(enum)21
3879 b(directionType)e(direction;)229 556 y(int)j(i,j,k;)229
3880 656 y(R)g(=)g(the)f(grammar)f(rule)h(applied)f(at)i(N;)229
3881 706 y(let)g(the)f(traversal)f(actions)g(for)h(T)h(in)f(the)g(attribute)
3882 f(definition)g(section)317 756 y(of)h(R)g(be)h(numbered)e(from)h(0)h
3883 (to)f(k-1;)229 805 y(for)h(\(i=0;)e(i<k;)h(i++\))317
3884 855 y({if)g(\(the)g(ith)g(traversal)f(action)g(specifier)g(has)h(no)h
3885 (@revorder\))491 905 y(order[i])e(=)i(staticOrder\(T\);)404
3886 955 y(else)f(if)g(\(\(the)g(expression)f(associated)f(with)i
3887 (@revorder\))f(==)h(0\))491 1005 y(order[i])f(=)i(staticOrder\(T\);)404
3888 1054 y(else)f(if)g(\(staticOrder\(T\))e(==)i(POSTORDER\))491
3889 1104 y(order[i])f(=)i(PREORDER;)404 1154 y(else)491 1204
3890 y(order[i])e(=)i(POSTORDER;)338 1254 y(if)g(\(the)f(ith)g(traversal)f
3891 (action)g(specifier)g(has)h(no)h(@revdirection\))491
3892 1303 y(direction)e(=)h(staticDirection\(T\);)404 1353
3893 y(else)g(if)g(\(\(the)g(expression)f(asociated)f(with)i
3894 (@revdirection\))e(==)j(0\))491 1403 y(direction)e(=)h
3895 (staticDirection\(T\);)404 1453 y(else)g(if)g(\(staticDirection\(T)o
3896 (\))e(==)i(LEFTTORIGHT\))491 1503 y(direction)f(=)h(RIGHTTOLEFT;)404
3897 1553 y(else)491 1602 y(direction)f(=)h(LEFTTORIGHT;)317
3898 1652 y(})229 1702 y(for)h(\(i=0;)e(i<k;)h(i++\))317 1752
3899 y(if)g(\(order[i])f(=)h(PREORDER\))404 1802 y(execute)f(the)h(ith)g
3900 (traversal)f(action;)229 1851 y(number)h(the)g(children)f(of)i(N)f
3901 (from)g(left)g(to)g(right)338 1901 y(with)g(integers)f(from)h(0)h(to)f
3902 (j-1;)229 1951 y(if)h(\(direction)d(==)j(LEFTTORIGHT\))317
3903 2001 y(for)f(\(i=0;)f(i<j;)h(i++\))43 b(pdTrav\(the)20
3904 b(ith)h(child)g(of)g(N,T\);)317 2051 y(else)317 2100
3905 y(for)g(\(i=j-1;)f(i>=0;)h(i--\))43 b(pdTrav\(the)19
3906 b(ith)i(child)g(of)h(N,T\);)229 2150 y(for)g(\(i=0;)e(i<k;)h(i++\))317
3907 2200 y(if)g(\(order[i])f(=)h(POSTORDER\))404 2250 y(execute)f(the)h
3908 (ith)g(traversal)f(action;)208 2300 y(})p eop
3910 49 49 bop 164 162 a Fk(B)48 b(TRA)-5 b(VERSAL)16 b(SEMANTICS)874
3911 b Fn(49)164 307 y Fa(void)21 b(doTraversals\(\))208 357
3912 y({int)g(i,k;)229 407 y(parse_tree_node)e(r;)229 506
3913 y(r)j(=)g(the)f(root)g(of)g(the)g(parse)g(tree;)229 556
3914 y(k)h(=)g(the)f(number)f(of)i(traversals;)229 606 y(number)f(the)g
3915 (traversals)f(from)h(0)g(to)h(k-1,)f(according)f(to)295
3916 656 y(the)h(order)g(of)g(appearance)f(of)h(their)g(specifications;)229
3917 706 y(for)h(\(i=0;)e(i<k;)h(i++\))317 756 y(if)g(\(!isDisabled\(the)d
3918 (ith)k(traversal\)\))382 805 y(pdTrav\(r,the)d(ith)i(traversal\);)208
3921 50 50 bop 164 162 a Fk(C)49 b(LIST)17 b(OF)f(RESER)-5
3922 b(VED)16 b(W)o(ORDS)g(AND)g(RESER)-5 b(VED)16 b(FILE)g(NAMES)69
3923 b Fn(50)164 315 y Fo(C)82 b(List)36 b(of)i(reserv)n(ed)d(w)n(ords)h
3924 (and)g(reserv)n(ed)f(\014le)306 407 y(names)164 516 y
3925 Fn(The)16 b(Ox)g(reserv)o(ed)f(w)o(ords)i(are)f(as)h(follo)o(ws:)189
3926 623 y Fd(@)p Fc(f)189 683 y Fd(@)p Fc(g)189 743 y Fd(@attribute)o(s)189
3927 803 y(@autoinh)189 864 y(@autosyn)189 924 y(@disable)189
3928 984 y(@e)189 1044 y(@i)189 1104 y(@lefttorig)o(ht)189
3929 1165 y(@m)189 1225 y(@postorder)189 1285 y(@preorder)189
3930 1345 y(@revdirect)o(io)o(n)189 1405 y(@revorder)189 1465
3931 y(@righttole)o(ft)189 1526 y(@warn)164 1668 y Fn(The)23
3932 b(follo)o(wing)g(\014le)g(names)g(in)g(the)g(curren)o(t)f(directory)h
3933 (are)g(reserv)o(ed)f(for)i(use)f(b)o(y)164 1728 y(Ox:)189
3934 1835 y Fd(oxout.h)638 b Fn(\(exactly)15 b(when)h(using)h
3935 Fd(-h)e Fn(option\))189 1895 y Fd(oxout.y)189 1955 y(oxout.l)638
3936 b Fn(\(exactly)15 b(when)h(using)h(exactly)e(one)h(Y-\014le\))189
3937 2015 y Fd(oxout0.l)p Fn(,)d Fd(oxout1.l)p Fn(,)g Fd(oxout2.l)p
3938 Fn(,)f Fi(:)c(:)g(:)58 b Fn(\(when)16 b(using)h(more)e(than)i(one)f
3941 51 51 bop 164 162 a Fk(D)49 b(SUMMAR)l(Y)14 b(OF)i(COMMAND-LINE)g
3942 (OPTIONS)474 b Fn(51)164 315 y Fo(D)83 b(Summary)26 b(of)i
3943 (command-line)f(options)164 425 y Fn(The)16 b(Ox)g(command)e(line)h
3944 (tak)o(es)h(the)g(form:)237 545 y Fd(ox)g Fc(f)g Fg(option)g
3945 Fc(g)g Fg(Y-\014le)j Fn([)p Fd(-G)p Fn(])14 b Fg(L-\014le)k
3946 Fc(f)e Fn([)p Fd(-G)p Fn(])f Fg(L-\014le)i Fc(g)164 666
3947 y Fn(The)f Fd(-G)g Fn(ann)o(unciator)g(and)h(the)f Fg(option)p
3948 Fn(s)h(are)f(describ)q(ed)g(as)h(follo)o(ws:)164 767
3949 y Fd(-G)24 b Fn(The)14 b(\014lename)f(whic)o(h)h(follo)o(ws)h(is)g
3950 (that)g(of)g(a)g(generic)f(\(i.e.)19 b(non-Lex\))d(L-\014le.)21
3951 b(This)286 828 y(option)14 b(is)g(used)g(when)g(the)g(Ox)g(user)f
3952 (prefers)h(a)g(scanner)g(hand-written)h(in)e(C)i(or)286
3953 888 y(C++.)22 b(Except)16 b(for)h(attribute)f(reference)f(sections,)h
3954 (the)g(L-\014le)h(m)o(ust)e(conform)286 948 y(to)23 b(C/C++)g(syn)o
3955 (tax.)39 b(The)23 b Fd(return)d Fn(reserv)o(ed)h(w)o(ord)i(is)f
3956 (recognized)g(in)g(an)o(y)286 1008 y(con)o(text)15 b(other)i(than)f
3957 (commen)o(ts)e(and)j(string)f(literals.)k(See)c(app)q(endix)g(A.)164
3958 1110 y Fd(-C)24 b Fn(Prin)o(t)15 b(the)h(Ox)g(cop)o(yrigh)o(t)g
3959 (statemen)o(t)e(and)j(disclaimer.)164 1212 y Fd(-I)24
3960 b Fn(Generate)16 b(co)q(de)g(for)h(C++)f(or)h(ANSI/ISO)e(C)h
3961 (compilation.)164 1313 y Fd(-S)24 b Fn(Strip)c(Ox-sp)q(eci\014c)g
3962 (constructs)h(from)e(the)h(Y-\014le)g(and)h(L-\014le\(s\))g(and)g
3963 (place)f(the)286 1374 y(pure)c(Y)l(acc)g(and)g(pure)g(Lex)h(results)f
3964 (on)g Fd(oxout*.*)p Fn(.)j(See)c(section)h(13.3.)164
3965 1475 y Fd(-U)24 b Fn(Sho)o(w)16 b(the)g(form)f(of)i(the)f(Ox)g(command)
3966 e(line.)164 1577 y Fd(-V)24 b Fn(Prin)o(t)15 b(the)h(v)o(ersion)g(n)o
3967 (um)o(b)q(er.)164 1679 y Fd(-h)24 b Fn(Pro)q(duce)c(an)g(Ox)f(header)h
3968 (\014le)f Fd(oxout.h)e Fn(to)j(b)q(e)g Fd(#include)p
3969 Fn(d)d(in)i(a)h(co)q(de)g(section)286 1739 y(\(b)q(et)o(w)o(een)f
3970 Fd(\045)p Fc(f)g Fn(and)h Fd(\045)p Fc(g)p Fn(\))f(in)g(the)h(Y-\014le)
3971 e(or)i(L-\014le\(s\).)32 b(This)19 b(p)q(ermits)f(one-step)286
3972 1799 y(compilation)11 b(of)i(the)g(parser)g(and)g(scanner\(s\).)21
3973 b(When)12 b(this)h(option)g(is)g(not)g(used,)286 1859
3974 y(Ox)18 b(places)f(the)h(header)g(information)f(in)h(eac)o(h)f(output)i
3975 (\014le)e(rather)h(than)h(in)f(a)286 1919 y(separate)f(header)f
3976 (\014le.)k(See)c(section)g(12.3.)164 2021 y Fd(-n)24
3977 b Fn(Generate)12 b(an)i(ev)m(aluator)f(that)h(determines)d(an)i(ev)m
3978 (aluation)g(order)h(and)f(c)o(hec)o(ks)f(for)286 2081
3979 y(cycles,)f(but)h(do)q(es)h(not)f(execute)f(the)g(co)q(de)h(that)h(ev)m
3980 (aluates)f(attribute)f(instances.)286 2141 y(See)16 b(section)f(13.4.)
3981 164 2243 y Fd(-u)24 b Fn(Generate)16 b(an)g(ev)m(aluator)h(that)f(prin)
3982 o(ts)g(parse-tree)g(memory-usage)f(statistics)h(for)286
3983 2303 y(eac)o(h)g(input.)21 b(See)15 b(section)h(13.6.)164
3984 2405 y Fd(-a)p Fi(N)29 b Fn(Set)13 b Fi(N)18 b Fn(as)13
3985 b(the)g(generated)g(ev)m(aluator's)g(default)g(structure-alignmen)o(t)d
3986 (size.)20 b(By)286 2465 y(default,)15 b(the)h(default)g
3987 (structure-alignmen)o(t)f(size)g(is)h(4.)22 b(See)15
3988 b(section)h(13.2.)p eop
3990 52 52 bop 164 162 a Fk(D)49 b(SUMMAR)l(Y)14 b(OF)i(COMMAND-LINE)g
3991 (OPTIONS)474 b Fn(52)164 307 y Fd(-Y)p Fi(aN)28 b Fn(Where)21
3992 b Fi(N)k Fn(is)c(an)g(in)o(teger)e(and)j Fi(a)e Fn(is)g(one)h(of)g(the)
3993 f(alphab)q(etic)g(c)o(haracters)h Fd(n)p Fn(,)286 367
3994 y Fd(c)p Fn(,)g(or)g Fd(r)p Fn(,)g(c)o(hange)g(the)f(default)h(size)f
3995 (of)h(data)g(structure)g Fi(a)f Fn(in)g(the)h(generated)286
3996 428 y(ev)m(aluator)k(to)f(size)f Fi(N)5 b Fn(.)46 b(When)24
3997 b(suc)o(h)g(a)g(data)h(structure)f(is)g(exceeded,)g(the)286
3998 488 y(generated)18 b(ev)m(aluator)h(issues)f(an)g(error)h(message)e
3999 (calling)g(for)i(use)f(of)g(a)h Fd(-Y)p Fi(aN)286 548
4000 y Fn(option.)j(The)16 b(e\013ects)f(of)i(the)e Fd(-Y)p
4001 Fi(aN)20 b Fn(options)d(for)f(the)g(v)m(arious)h(v)m(alues)f(of)g
4002 Fi(a)g Fn(are)286 608 y(as)h(follo)o(ws:)286 710 y Fd(n)24
4003 b(-Yn)p Fi(N)17 b Fn(causes)d(allo)q(cation)g(of)g Fi(N)k
4004 Fn(b)o(ytes)13 b(for)h(parse-tree)f(no)q(des)h(and)g(attribute)393
4005 770 y(instances.)286 851 y Fd(c)24 b Fi(N)17 b Fn(is)12
4006 b(the)f(maxim)o(um)d(n)o(um)o(b)q(er)i(of)i(non-ro)q(ot)i(no)q(des)e
4007 (in)g(the)f(parse)i(tree.)19 b Fd(-Yc)p Fi(N)393 911
4008 y Fn(causes)j(allo)q(cation)g(of)f Fi(N)27 b Fd(*)e(sizeof\(void)d(*\))
4009 f Fn(b)o(ytes)f(for)i(p)q(oin)o(ters)g(to)393 971 y(c)o(hild)15
4010 b(no)q(des.)286 1052 y Fd(r)24 b Fi(N)f Fn(is)17 b(the)g(maxim)o(um)c
4011 (n)o(um)o(b)q(er)j(of)i(attribute)f(instances)h(in)f(the)g(parse)h
4012 (tree.)393 1112 y Fi(N)k Fn(b)o(ytes)15 b(are)i(allo)q(cated)f(for)g
4013 (this.)286 1214 y(See)g(sections)g(13.5)h(and)g(13.6.)164
4014 1316 y Fd(-YY)23 b Fn(Enable)c(the)g(generated)f(ev)m(aluator)h(to)h
4015 (understand)f(the)g(same)e Fd(-Y)p Fi(aN)23 b Fn(options)286
4016 1376 y(as)17 b(do)q(es)g(Ox)f(itself.)k(See)c(section)f(13.5.)164
4017 1478 y Fd(-X)p Fi(aN)28 b Fn(Where)19 b Fi(N)24 b Fn(is)19
4018 b(an)g(in)o(teger)f(and)i Fi(a)f Fn(is)f(an)i(alphab)q(etic)f(c)o
4019 (haracter,)f(c)o(hange)h(the)286 1538 y(default)j(size)f(of)i(Ox's)f
4020 (data)h(structure)f Fi(a)g Fn(to)h(size)e Fi(N)5 b Fn(.)40
4021 b(When)22 b(suc)o(h)g(a)h(data)286 1598 y(structure)c(is)g(exceeded,)f
4022 (Ox)h(issues)g(an)h(error)f(message)g(calling)f(for)i(use)f(of)h(a)286
4023 1658 y Fd(-X)p Fi(aN)g Fn(option.)p eop
4025 53 53 bop 164 162 a Fk(REFERENCES)1235 b Fn(53)164 315
4026 y Fo(References)164 425 y Fn([Johnson)17 b(75])151 b(Stephen)16
4027 b(C.)h(Johnson,)g Fg(Y)l(ac)n(c:)24 b(Y)l(et)18 b(A)o(nother)g
4028 (Compiler)g(Com-)581 485 y(piler)p Fn(,)40 b(Computing)34
4029 b(Science)f(T)l(ec)o(hnical)h(Rep)q(ort)h(No.)g(32,)581
4030 545 y(A)l(T&T)14 b(Bell)f(Lab)q(oratories,)j(Murra)o(y)d(Hill,)g(New)g
4031 (Jersey)l(,)h(1975.)581 606 y(Reprin)o(ted)26 b(as)i(PS1:15)g(in)e
4032 Fg(UNIX)i(Pr)n(o)n(gr)n(ammer's)d(Manual)p Fn(,)581 666
4033 y(Usenix)15 b(Asso)q(ciation,)h(1986.)164 767 y([Lesk)g(75])228
4034 b(M.E.)13 b(Lesk)h(and)g(E.)g(Sc)o(hmidt,)e Fg(L)n(ex{A)j(L)n(exic)n
4035 (al)g(A)o(nalyzer)h(Gen-)581 828 y(er)n(ator)p Fn(,)32
4036 b(Computing)d(Science)g(T)l(ec)o(hnical)f(Rep)q(ort)i(No.)g(39,)581
4037 888 y(A)l(T&T)17 b(Bell)e(Lab)q(oratories,)j(Murra)o(y)e(Hills,)e(New)i
4038 (Jersey)l(,)g(Oc-)581 948 y(tob)q(er)g(1975.)h(Reprin)o(ted)e(as)i
4039 (PS1:16)f(in)g Fg(UNIX)h(Pr)n(o)n(gr)n(ammer's)581 1008
4040 y(Manual)p Fn(,)f(Usenix)g(Asso)q(ciation,)g(1986.)164
4041 1110 y([KR)g(88])251 b(Brian)15 b(W.)g(Kernighan)g(and)h(Dennis)f(M.)f
4042 (Ritc)o(hie,)f Fg(The)k(C)f(Pr)n(o-)581 1170 y(gr)n(amming)h(L)n
4043 (anguage,)h(2nd)g(Ed.)e Fn(Pren)o(tice-Hall,)e(1988.)164
4044 1272 y([W)l(aite)h(84])201 b(William)22 b(M.)i(W)l(aite)g(and)h
4045 (Gerhard)g(Go)q(os,)i Fg(Compiler)e(Con-)581 1332 y(struction)p
4046 Fn(,)17 b(Springer-V)l(erlag,)e(1984.)164 1434 y([Aho)h(86])237
4047 b(Alfred)30 b(V.)g(Aho,)35 b(Ra)o(vi)30 b(Sethi,)k(and)e(Je\013rey)f
4048 (D.)g(Ullman,)581 1494 y Fg(Compilers:)26 b(Principles,)21
4049 b(T)l(e)n(chniques,)h(and)d(T)l(o)n(ols)p Fn(,)g(Addison-)581
4050 1554 y(W)l(esley)l(,)c(1986.)164 1656 y([Jaza)o(y)o(eri)g(75])152
4051 b(M.)12 b(Jaza)o(y)o(eri,)g(W.F.)g(Ogden,)h(and)h(W.C.)e(Rounds,)i
4052 Fg(The)g(Intrin-)581 1716 y(sic)g(Exp)n(onential)h(Complexity)e(of)h
4053 (the)g(Cir)n(cularity)e(Pr)n(oblem)h(for)581 1776 y(A)o(ttribute)18
4054 b(Gr)n(ammars)p Fn(,)13 b(Comm)o(unications)h(of)i(the)f(A)o(CM,)g(V)l
4055 (ol.)581 1836 y(18,)i(No.)e(12,)i(pp.)f(697-706,)i(Decem)o(b)q(er)c
4056 (1975.)164 1938 y([Lorho)j(88])200 b(Pierre)15 b(Deransart,)i(Martin)f
4057 (Jourdan,)g(and)h(Bernhard)f(Lorho,)581 1998 y Fg(A)o(ttribute)27
4058 b(Gr)n(ammars:)36 b(De\014nitions,)29 b(Systems,)g(and)c(Bibli-)581
4059 2058 y(o)n(gr)n(aphy)p Fn(,)j(Lecture)f(Notes)g(in)g(Computer)f
4060 (Science,)j(v.)d(323,)581 2119 y(Springer)16 b(V)l(erlag,)f(1988.)164
4061 2220 y([Kn)o(uth)h(68])188 b(Donald)18 b(E.)f(Kn)o(uth,)g
4062 Fg(Semantics)j(of)e(Context-F)l(r)n(e)n(e)h(L)n(anguages)581
4063 2281 y Fn(Mathematical)10 b(Systems)g(Theory)l(,)i(V)l(ol.)e(2,)i(No.)f
4064 (2,)i(pp.)e(127-145,)581 2341 y(1968.)p eop
4066 54 54 bop 164 391 a Fo(Index)164 481 y Fd(@)p Fc(f)p
4067 Fn(,)15 b(8,)i(9)164 542 y Fd(@)p Fc(g)p Fn(,)e(8,)i(9)247
4068 602 y(\(as)24 b(attribute)g(de\014nition)f(termi-)330
4069 662 y(nator\),)17 b(10)164 722 y Fd(@attribute)o(s)p
4070 Fn(,)c(6)164 782 y Fd(@autoinh)p Fn(,)g(26,)j(27)164
4071 843 y Fd(@autosyn)p Fn(,)d(26,)j(27)164 903 y Fd(@disable)p
4072 Fn(,)d(21)164 963 y Fd(@e)p Fn(,)i(10)164 1023 y Fd(@i)p
4073 Fn(,)g(10)164 1083 y Fd(@lefttorig)o(ht)p Fn(,)d(21)164
4074 1143 y Fd(@m)p Fn(,)j(10)164 1204 y Fd(@postorder)o Fn(,)e(21)164
4075 1264 y Fd(@preorder)p Fn(,)f(21)164 1324 y Fd(@revdirect)o(ion)o
4076 Fn(,)h(22)164 1384 y Fd(@revorder)p Fn(,)f(22)164 1444
4077 y Fd(@righttole)o(ft)p Fn(,)g(21)164 1505 y Fd(@warn)p
4078 Fn(,)i(27)164 1565 y Fd($$)p Fn(,)25 b Fd($1)p Fn(,)f
4079 Fd($2)p Fn(,)h(...,)f(\(Y)l(acc)f(pseudo)o(v)m(ari-)330
4080 1625 y(ables\),)16 b(17)164 1685 y Fd(oxout.*)p Fn(,)d(29)164
4081 1745 y Fd(oxout?.l)p Fn(,)g(29)164 1847 y(alignmen)o(t)h(constan)o(t,)j
4082 (31)164 1907 y(am)o(biguous)23 b(form)g(of)h Fd(return)e
4083 Fn(of)i(to-)330 1967 y(k)o(en,)15 b(14)164 2028 y(attribute)247
4084 2088 y(inherited,)f Fj(9)247 2148 y Fn(syn)o(thesized,)h
4085 Fj(9)164 2208 y Fn(attribute)22 b(\(as)g(b)q(elonging)h(to)f(a)h(sym-)
4086 330 2268 y(b)q(ol\),)16 b Fj(7)164 2329 y Fn(attribute)g(declaration,)f
4087 Fj(6)164 2389 y Fn(attribute)h(de\014nition,)f Fj(9)247
4088 2449 y Fn(dep)q(endency)h(part)g(of,)g Fj(9)1129 481
4089 y Fn(ev)m(aluation)g(part)h(of,)f Fj(9)1129 542 y Fn(explicit)e(mo)q
4090 (de,)h(10)1129 602 y(implicit)e(mo)q(de,)i(11)1129 662
4091 y(mixed)f(mo)q(de,)h(11)1129 722 y(termination)g(of,)h
4092 Fj(10)1046 782 y Fn(attribute)g(de\014nition)g(mo)q(des,)f(10)1046
4093 843 y(attribute)h(grammar)1129 903 y(class)22 b(of)h(A)o(Gs)f(accepted)
4094 f(b)o(y)h(Ox,)1212 963 y(12)1129 1023 y(execution)12
4095 b(sequence)g(not)i(explicit)1212 1083 y(in,)i(17)1046
4096 1143 y(attribute)g(instance,)g Fj(7)1129 1204 y Fn(solving)g(an,)h
4097 Fj(11)1046 1264 y Fn(attribute)e(instance)h(\(as)g(b)q(elonging)h(to)
4098 1212 1324 y(a)g(no)q(de\),)f Fj(7)1046 1384 y Fn(attribute)g(instances)
4099 1129 1444 y(ready)g(set)g(of,)g Fj(17)1046 1505 y Fn(attribute)g(o)q
4100 (ccurrence,)f Fj(7)1129 1565 y Fn(dep)q(endees)h(of)h(an,)f(10)1129
4101 1625 y(dep)q(enden)o(ts)g(of)h(an,)f(10)1129 1685 y(inherited,)f
4102 Fj(8)1129 1745 y Fn(syn)o(thesized,)g Fj(8)1046 1806
4103 y Fn(attribute)h(o)q(ccurrence)g(,)f(8)1046 1866 y(attribute)h
4104 (reference,)e Fj(10)1046 1926 y Fn(attribute)i(reference)f(section,)g
4105 Fj(8)p Fn(,)h Fj(12)1046 1986 y Fn(attribute)26 b(reference)f(section)h
4106 (delim-)1212 2046 y(iters,)15 b(12)1046 2148 y(circular)g(grammar,)f
4107 Fj(15)1046 2208 y Fn(co)q(de)j(generation,)f(18)1046
4108 2268 y(command-line)d(options,)k(51)1046 2329 y(command-line)c(syn)o
4109 (tax,)j(51)1046 2389 y(commen)o(ts,)d(6)1046 2449 y(cop)o(y)j(rule,)f
4110 Fj(26)949 2599 y Fn(54)p eop
4112 55 55 bop 164 162 a Fk(INDEX)1408 b Fn(55)164 307 y(cycle)14
4113 b(\(in)i(an)g(attributed)g(parse)g(tree\),)330 367 y
4114 Fj(15)164 428 y Fn(cycle)f(detection,)f(15)164 524 y(declaration)247
4115 584 y(attribute,)h Fj(6)164 644 y Fn(decoration,)h Fj(17)164
4116 704 y Fn(de\014ned,)g(attribute)f(o)q(ccurrence,)h(10)164
4117 765 y(de\014nition)247 825 y(attribute,)f Fj(9)164 885
4118 y Fn(de\014nition)h(mo)q(de)f(ann)o(unciator,)h Fj(10)164
4119 945 y Fn(dep)q(endee,)f Fj(10)164 1005 y Fn(dep)q(endency)h
4120 (expression,)f Fj(10)164 1066 y Fn(dep)q(endency)24 b(part)h(\(of)g(an)
4121 g(attribute)330 1126 y(de\014nition\),)15 b Fj(9)164
4122 1186 y Fn(dep)q(enden)o(t,)g Fj(10)164 1246 y Fn(dep)q(ends)i(up)q(on,)
4123 f(10)164 1306 y(dynamic)e(tra)o(v)o(ersal)i(mo)q(di\014er,)e
4124 Fj(22)164 1403 y Fn(ev)m(aluation)i(expression,)g Fj(10)164
4125 1463 y Fn(ev)m(aluation)11 b(part)g(\(of)g(an)h(attribute)e(def-)330
4126 1523 y(inition\),)15 b Fj(9)164 1583 y Fn(example)247
4127 1643 y(Kn)o(uth's)h(classical,)f(36)247 1704 y(v)o(ery)g(easy)l(,)h(34)
4128 164 1764 y(execution)j(sequence)h(not)h(explicit)d(in)330
4129 1824 y(attribute)e(grammars,)e(17)164 1884 y(explicit)g(mo)q(de)h(ann)o
4130 (unciator,)i(10,)f Fj(10)164 1944 y Fn(explicit)i(mo)q(de)i(attribute)h
4131 (de\014nition,)330 2005 y Fj(10)164 2101 y Fn(\014le)16
4132 b(names)247 2161 y(Ox)g(output,)g(29)164 2221 y(\014nal)g(decoration,)g
4133 Fj(17,)j(18)164 2318 y Fn(global)e(v)m(ariables)247 2378
4134 y(reference)e(to)h(C's,)g(18)164 2474 y(header)g(\014le)g
4135 Fd(oxout.h)p Fn(,)d(30)1046 307 y(home)i(rule,)g Fj(9)1046
4136 407 y Fn(implicit)e(mo)q(de)i(ann)o(unciator,)i Fj(11)p
4137 Fn(,)e(11)1046 468 y(implicit)g(mo)q(de)j(attribute)g(de\014nition,)
4138 1212 528 y Fj(11)1046 588 y Fn(inherited)d(attribute,)h
4139 Fj(9)1046 648 y Fn(inherited)f(attribute)h(o)q(ccurrence,)f
4140 Fj(8)1046 708 y Fn(instance)1129 769 y(attribute,)h Fj(7)1046
4141 869 y Fn(Kn)o(uth's)g(classical)f(example,)f(36)1046
4142 969 y(L-\014le,)i Fj(5)1046 1029 y Fn(LALR\(1\))c(prop)q(ert)o(y)e
4143 (preserv)o(ed)g(b)o(y)g(Ox-)1212 1090 y(prepro)q(cessing,)16
4144 b(16)1046 1150 y(left-hand)g(side,)g(7)1046 1210 y(LHS)g(\(left-hand)h
4145 (side\),)e(7)1046 1270 y(lo)q(ok)m(ahead)j(bu\013er,)e
4146 Fj(16)1046 1371 y Fn(macros,)f(23)1046 1431 y(macros)10
4147 b(forbidden)h(for)g Fd(return)e Fn(of)i(yylex,)1212 1491
4148 y(12)1046 1551 y(mixed)j(mo)q(de)h(ann)o(unciator,)i(11,)f
4149 Fj(11)1046 1611 y Fn(mixed)9 b(mo)q(de)h(attribute)g(de\014nition,)h
4150 Fj(11)1046 1672 y Fn(mo)q(de)1129 1732 y(attribute)16
4151 b(de\014nition,)f(10)1046 1792 y(mo)q(de)g(ann)o(unciator)1129
4152 1852 y Fd(@e)h Fn(\(explicit\),)d(10)1129 1912 y Fd(@i)j
4153 Fn(\(implici)o(t\),)d(10,)k(11)1129 1972 y Fd(@m)f Fn(\(mixed\),)d(10,)
4154 k(11)1129 2033 y(de\014nition,)e Fj(10)1129 2093 y Fn(tra)o(v)o(ersal,)
4155 g Fj(20)1046 2193 y Fn(o)q(ccurrence)1129 2253 y(attribute,)h
4156 Fj(7)p Fn(,)f(8)1046 2314 y(options)1129 2374 y(command-line,)e(51)1046
4157 2474 y(paren)o(t)j(rule,)f Fj(9)p eop
4159 56 56 bop 164 162 a Fk(INDEX)1408 b Fn(56)164 307 y(p)q(ostdecoration,)
4160 17 b Fj(18)164 367 y Fn(p)q(ostdecoration)g(tra)o(v)o(ersal,)e
4161 Fj(18)164 428 y Fn(pseudo)o(v)m(ariables)247 488 y(references)g(to)h(Y)
4162 l(acc's,)f(17)164 588 y(ready)21 b(set)h(\(of)f(attribute)g
4163 (instances\),)330 648 y Fj(17)164 708 y Fn(reference)247
4164 769 y(attribute,)15 b Fj(10)164 829 y Fd(return)247 889
4165 y Fn(of)i(yylex)d(m)o(ust)h(b)q(e)h(explicit,)e(12)164
4166 949 y Fd(return)g Fn(statemen)o(ts)247 1009 y(lexical)9
4167 b(rules)h(asso)q(ciated)i(with,)f Fj(12)164 1070 y Fn(RHS)16
4168 b(\(righ)o(t-hand)h(side\),)e(7)164 1130 y(righ)o(t-hand)i(side,)e(7)
4169 164 1190 y(rule,)g Fj(7)247 1250 y Fn(home,)g Fj(9)247
4170 1310 y Fn(paren)o(t,)h Fj(9)247 1371 y Fd(return)p Fn(ed)e(tok)o(en)i
4171 (as)g(a,)h Fj(7)164 1431 y Fn(rules)f(section)g(of)g(a)h(Y)l(acc)e
4172 (\014le,)g Fj(9)164 1531 y Fn(side)h(e\013ects,)f(18)164
4173 1591 y(solving)h(\(an)h(attribute)f(instance\),)f Fj(11)164
4174 1651 y Fn(sync)o(hronization)247 1712 y(Ox)h(and)h(Y)l(acc)e(stac)o(k,)
4175 h(16,)g(31)164 1772 y(syn)o(thesized)f(attribute,)g Fj(9)164
4176 1832 y Fn(syn)o(thesized)c(attribute)h(o)q(ccurrence,)g
4177 Fj(8)164 1932 y Fn(tok)o(en)247 1993 y(inherited)j(attributes)h(of)h
4178 (a,)f(12)247 2053 y(syn)o(thesized)f(attributes)h(of)h(a,)f(12)164
4179 2113 y(tra)o(v)o(ersal)247 2173 y(p)q(ostdecoration,)h
4180 Fj(18)164 2233 y Fn(tra)o(v)o(ersal)e(action,)h Fj(22)164
4181 2293 y Fn(tra)o(v)o(ersal)f(action)i(sp)q(eci\014cation,)e
4182 Fj(22)164 2354 y Fn(tra)o(v)o(ersal)g(action)i(sp)q(eci\014er,)e
4183 Fj(20)164 2414 y Fn(tra)o(v)o(ersal)10 b(mo)q(de)g(ann)o(unciator,)i
4184 Fj(20)p Fn(,)g Fj(22)164 2474 y Fn(tra)o(v)o(ersal)j(mo)q(di\014er)1129
4185 307 y(dynamic,)f Fj(22)1046 367 y Fn(tra)o(v)o(ersal)i(sp)q
4186 (eci\014cation,)f Fj(21)1046 428 y Fn(tra)o(v)o(ersal)h(sp)q
4187 (eci\014er,)f Fj(21)1046 488 y Fn(tra)o(v)o(ersal)h(sp)q(eci\014er)f
4188 (sequence,)g Fj(21)1046 589 y Fn(Y-\014le,)g Fj(5)1046
4189 650 y Fd(yyleng)p Fn(,)f(17)1046 710 y Fd(yytext)p Fn(,)g(17)p
4193 userdict /end-hook known{end-hook}if
projects / uebersetzerbau-ss10.git / blob