source: trunk/contrib/bison-2.4.2/share/bison/bison.m4 @ 1933

Last change on this file since 1933 was 1933, checked in by sam, 11 years ago

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1                                                            -*- Autoconf -*-
2
3# Language-independent M4 Macros for Bison.
4# Copyright (C) 2002, 2004-2010 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <http://www.gnu.org/licenses/>.
18
19
20## ---------------- ##
21## Identification.  ##
22## ---------------- ##
23
24# b4_copyright(TITLE, YEARS)
25# --------------------------
26m4_define([b4_copyright],
27[b4_comment([A Bison parser, made by GNU Bison b4_version.])
28
29b4_comment([$1
30
31m4_text_wrap([Copyright (C) $2 Free Software Foundation, Inc.], [   ])
32
33This program is free software: you can redistribute it and/or modify
34it under the terms of the GNU General Public License as published by
35the Free Software Foundation, either version 3 of the License, or
36(at your option) any later version.
37
38This program is distributed in the hope that it will be useful,
39but WITHOUT ANY WARRANTY; without even the implied warranty of
40MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
41GNU General Public License for more details.
42
43You should have received a copy of the GNU General Public License
44along with this program.  If not, see <http://www.gnu.org/licenses/>.])
45
46b4_comment([As a special exception, you may create a larger work that contains
47part or all of the Bison parser skeleton and distribute that work
48under terms of your choice, so long as that work isn't itself a
49parser generator using the skeleton or a modified version thereof
50as a parser skeleton.  Alternatively, if you modify or redistribute
51the parser skeleton itself, you may (at your option) remove this
52special exception, which will cause the skeleton and the resulting
53Bison output files to be licensed under the GNU General Public
54License without this special exception.
55
56This special exception was added by the Free Software Foundation in
57version 2.2 of Bison.])])
58
59
60## ---------------- ##
61## Error handling.  ##
62## ---------------- ##
63
64# The following error handling macros print error directives that should not
65# become arguments of other macro invocations since they would likely then be
66# mangled.  Thus, they print to stdout directly.
67
68# b4_cat(TEXT)
69# ------------
70# Write TEXT to stdout.  Precede the final newline with an @ so that it's
71# escaped.  For example:
72#
73#   b4_cat([[@complain(invalid input@)]])
74m4_define([b4_cat],
75[m4_syscmd([cat <<'_m4eof'
76]m4_bpatsubst(m4_dquote($1), [_m4eof], [_m4@`eof])[@
77_m4eof
78])dnl
79m4_if(m4_sysval, [0], [], [m4_fatal([$0: cannot write to stdout])])])
80
81# b4_error(KIND, FORMAT, [ARG1], [ARG2], ...)
82# -------------------------------------------
83# Write @KIND(FORMAT@,ARG1@,ARG2@,...@) to stdout.
84#
85# For example:
86#
87#   b4_error([[warn]], [[invalid value for `%s': %s]], [[foo]], [[3]])
88m4_define([b4_error],
89[b4_cat([[@]$1[(]$2[]]dnl
90[m4_if([$#], [2], [],
91       [m4_foreach([b4_arg],
92                   m4_dquote(m4_shift(m4_shift($@))),
93                   [[@,]b4_arg])])[@)]])])
94
95# b4_error_at(KIND, START, END, FORMAT, [ARG1], [ARG2], ...)
96# ----------------------------------------------------------
97# Write @KIND_at(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
98#
99# For example:
100#
101#   b4_error_at([[complain]], [[input.y:2.3]], [[input.y:5.4]],
102#               [[invalid %s]], [[foo]])
103m4_define([b4_error_at],
104[b4_cat([[@]$1[_at(]$2[@,]$3[@,]$4[]]dnl
105[m4_if([$#], [4], [],
106       [m4_foreach([b4_arg],
107                   m4_dquote(m4_shift(m4_shift(m4_shift(m4_shift($@))))),
108                   [[@,]b4_arg])])[@)]])])
109
110# b4_warn(FORMAT, [ARG1], [ARG2], ...)
111# ------------------------------------
112# Write @warn(FORMAT@,ARG1@,ARG2@,...@) to stdout.
113#
114# For example:
115#
116#   b4_warn([[invalid value for `%s': %s]], [[foo]], [[3]])
117#
118# As a simple test suite, this:
119#
120#   m4_divert(-1)
121#   m4_define([asdf], [ASDF])
122#   m4_define([fsa], [FSA])
123#   m4_define([fdsa], [FDSA])
124#   b4_warn([[[asdf), asdf]]], [[[fsa), fsa]]], [[[fdsa), fdsa]]])
125#   b4_warn([[asdf), asdf]], [[fsa), fsa]], [[fdsa), fdsa]])
126#   b4_warn()
127#   b4_warn(1)
128#   b4_warn(1, 2)
129#
130# Should produce this without newlines:
131#
132#   @warn([asdf), asdf]@,[fsa), fsa]@,[fdsa), fdsa]@)
133#   @warn(asdf), asdf@,fsa), fsa@,fdsa), fdsa@)
134#   @warn(@)
135#   @warn(1@)
136#   @warn(1@,2@)
137m4_define([b4_warn],
138[b4_error([[warn]], $@)])
139
140# b4_warn_at(START, END, FORMAT, [ARG1], [ARG2], ...)
141# ---------------------------------------------------
142# Write @warn(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
143#
144# For example:
145#
146#   b4_warn_at([[input.y:2.3]], [[input.y:5.4]], [[invalid %s]], [[foo]])
147m4_define([b4_warn_at],
148[b4_error_at([[warn]], $@)])
149
150# b4_complain(FORMAT, [ARG1], [ARG2], ...)
151# ----------------------------------------
152# Write @complain(FORMAT@,ARG1@,ARG2@,...@) to stdout.
153#
154# See b4_warn example.
155m4_define([b4_complain],
156[b4_error([[complain]], $@)])
157
158# b4_complain_at(START, END, FORMAT, [ARG1], [ARG2], ...)
159# -------------------------------------------------------
160# Write @complain(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
161#
162# See b4_warn_at example.
163m4_define([b4_complain_at],
164[b4_error_at([[complain]], $@)])
165
166# b4_fatal(FORMAT, [ARG1], [ARG2], ...)
167# -------------------------------------
168# Write @fatal(FORMAT@,ARG1@,ARG2@,...@) to stdout and exit.
169#
170# See b4_warn example.
171m4_define([b4_fatal],
172[b4_error([[fatal]], $@)dnl
173m4_exit(1)])
174
175# b4_fatal_at(START, END, FORMAT, [ARG1], [ARG2], ...)
176# ----------------------------------------------------
177# Write @fatal(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout and exit.
178#
179# See b4_warn_at example.
180m4_define([b4_fatal_at],
181[b4_error_at([[fatal]], $@)dnl
182m4_exit(1)])
183
184
185## ---------------- ##
186## Default values.  ##
187## ---------------- ##
188
189# m4_define_default([b4_lex_param], [])   dnl breaks other skeletons
190m4_define_default([b4_pre_prologue], [])
191m4_define_default([b4_post_prologue], [])
192m4_define_default([b4_epilogue], [])
193m4_define_default([b4_parse_param], [])
194
195# The initial column and line.
196m4_define_default([b4_location_initial_column], [1])
197m4_define_default([b4_location_initial_line],   [1])
198
199
200## ------------ ##
201## Data Types.  ##
202## ------------ ##
203
204# b4_ints_in(INT1, INT2, LOW, HIGH)
205# ---------------------------------
206# Return 1 iff both INT1 and INT2 are in [LOW, HIGH], 0 otherwise.
207m4_define([b4_ints_in],
208[m4_eval([$3 <= $1 && $1 <= $4 && $3 <= $2 && $2 <= $4])])
209
210
211
212## ------------------ ##
213## Decoding options.  ##
214## ------------------ ##
215
216# b4_flag_if(FLAG, IF-TRUE, IF-FALSE)
217# -----------------------------------
218# Run IF-TRUE if b4_FLAG_flag is 1, IF-FALSE if FLAG is 0, otherwise fail.
219m4_define([b4_flag_if],
220[m4_case(b4_$1_flag,
221         [0], [$3],
222         [1], [$2],
223         [m4_fatal([invalid $1 value: ]$1)])])
224
225
226# b4_define_flag_if(FLAG)
227# -----------------------
228# Define "b4_FLAG_if(IF-TRUE, IF-FALSE)" that depends on the
229# value of the Boolean FLAG.
230m4_define([b4_define_flag_if],
231[_b4_define_flag_if($[1], $[2], [$1])])
232
233# _b4_define_flag_if($1, $2, FLAG)
234# --------------------------------
235# This macro works around the impossibility to define macros
236# inside macros, because issuing `[$1]' is not possible in M4 :(.
237# This sucks hard, GNU M4 should really provide M5 like $$1.
238m4_define([_b4_define_flag_if],
239[m4_if([$1$2], $[1]$[2], [],
240       [m4_fatal([$0: Invalid arguments: $@])])dnl
241m4_define([b4_$3_if],
242          [b4_flag_if([$3], [$1], [$2])])])
243
244
245# b4_FLAG_if(IF-TRUE, IF-FALSE)
246# -----------------------------
247# Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
248b4_define_flag_if([defines])            # Whether headers are requested.
249b4_define_flag_if([error_verbose])      # Whether error are verbose.
250b4_define_flag_if([glr])                # Whether a GLR parser is requested.
251b4_define_flag_if([locations])          # Whether locations are tracked.
252b4_define_flag_if([nondeterministic])   # Whether conflicts should be handled.
253b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.
254
255
256## ------------------------- ##
257## Assigning token numbers.  ##
258## ------------------------- ##
259
260
261## ----------- ##
262## Synclines.  ##
263## ----------- ##
264
265# b4_basename(NAME)
266# -----------------
267# Similar to POSIX basename; the differences don't matter here.
268# Beware that NAME is not evaluated.
269m4_define([b4_basename],
270[m4_bpatsubst([$1], [^.*/\([^/]+\)/*$], [\1])])
271
272
273# b4_syncline(LINE, FILE)
274# -----------------------
275m4_define([b4_syncline],
276[b4_flag_if([synclines], [
277b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
278b4_sync_start([$1], [$2])])])
279
280m4_define([b4_sync_end], [b4_comment([Line $1 of $2])])
281m4_define([b4_sync_start], [b4_comment([Line $1 of $2])])
282
283# b4_user_code(USER-CODE)
284# -----------------------
285# Emit code from the user, ending it with synclines.
286m4_define([b4_user_code],
287[$1
288b4_syncline([@oline@], [@ofile@])])
289
290
291# b4_define_user_code(MACRO)
292# --------------------------
293# From b4_MACRO, build b4_user_MACRO that includes the synclines.
294m4_define([b4_define_user_code],
295[m4_define([b4_user_$1],
296[b4_user_code([b4_$1])])])
297
298
299# b4_user_actions
300# b4_user_initial_action
301# b4_user_post_prologue
302# b4_user_pre_prologue
303# b4_user_stype
304# ----------------------
305# Macros that issue user code, ending with synclines.
306b4_define_user_code([actions])
307b4_define_user_code([initial_action])
308b4_define_user_code([post_prologue])
309b4_define_user_code([pre_prologue])
310b4_define_user_code([stype])
311
312
313# b4_check_user_names(WHAT, USER-LIST, BISON-NAMESPACE)
314# --------------------------------------------------------
315# Warn if any name of type WHAT is used by the user (as recorded in USER-LIST)
316# but is not used by Bison (as recorded by macros in the namespace
317# BISON-NAMESPACE).
318#
319# USER-LIST must expand to a list specifying all grammar occurrences of all
320# names of type WHAT.   Each item in the list must be a triplet specifying one
321# occurrence: name, start boundary, and end boundary.  Empty string names are
322# fine.  An empty list is fine.
323#
324# For example, to define b4_foo_user_names to be used for USER-LIST with three
325# name occurrences and with correct quoting:
326#
327#   m4_define([b4_foo_user_names],
328#             [[[[[[bar]], [[parser.y:1.7]], [[parser.y:1.16]]]],
329#               [[[[bar]], [[parser.y:5.7]], [[parser.y:5.16]]]],
330#               [[[[baz]], [[parser.y:8.7]], [[parser.y:8.16]]]]]])
331#
332# The macro BISON-NAMESPACE(bar) must be defined iff the name bar of type WHAT
333# is used by Bison (in the front-end or in the skeleton).  Empty string names
334# are fine, but it would be ugly for Bison to actually use one.
335#
336# For example, to use b4_foo_bison_names for BISON-NAMESPACE and define that
337# the names bar and baz are used by Bison:
338#
339#   m4_define([b4_foo_bison_names(bar)])
340#   m4_define([b4_foo_bison_names(baz)])
341#
342# To invoke b4_check_user_names with TYPE foo, with USER-LIST
343# b4_foo_user_names, with BISON-NAMESPACE b4_foo_bison_names, and with correct
344# quoting:
345#
346#   b4_check_user_names([[foo]], [b4_foo_user_names],
347#                       [[b4_foo_bison_names]])
348m4_define([b4_check_user_names],
349[m4_foreach([b4_occurrence], $2,
350[m4_pushdef([b4_occurrence], b4_occurrence)dnl
351m4_pushdef([b4_user_name], m4_car(b4_occurrence))dnl
352m4_pushdef([b4_start], m4_car(m4_shift(b4_occurrence)))dnl
353m4_pushdef([b4_end], m4_shift(m4_shift(b4_occurrence)))dnl
354m4_ifndef($3[(]m4_quote(b4_user_name)[)],
355          [b4_warn_at([b4_start], [b4_end],
356                      [[%s `%s' is not used]],
357                      [$1], [b4_user_name])])[]dnl
358m4_popdef([b4_occurrence])dnl
359m4_popdef([b4_user_name])dnl
360m4_popdef([b4_start])dnl
361m4_popdef([b4_end])dnl
362])])
363
364# b4_percent_define_get(VARIABLE)
365# -------------------------------
366# Mimic muscle_percent_define_get in ../src/muscle_tab.h exactly.  That is, if
367# the %define variable VARIABLE is defined, emit its value.  Also, record
368# Bison's usage of VARIABLE by defining
369# b4_percent_define_bison_variables(VARIABLE).
370#
371# For example:
372#
373#   b4_percent_define_get([[foo]])
374m4_define([b4_percent_define_get],
375[m4_define([b4_percent_define_bison_variables(]$1[)])dnl
376m4_ifdef([b4_percent_define(]$1[)], [m4_indir([b4_percent_define(]$1[)])])])
377
378# b4_percent_define_get_loc(VARIABLE)
379# -----------------------------------
380# Mimic muscle_percent_define_get_loc in ../src/muscle_tab.h exactly.  That is,
381# if the %define variable VARIABLE is undefined, complain fatally since that's
382# a Bison or skeleton error.  Otherwise, return its definition location in a
383# form approriate for the first two arguments of b4_warn_at, b4_complain_at, or
384# b4_fatal_at.  Don't record this as a Bison usage of VARIABLE as there's no
385# reason to suspect that the user-supplied value has yet influenced the output.
386#
387# For example:
388#
389#   b4_complain_at(b4_percent_define_get_loc([[foo]]), [[invalid foo]])
390m4_define([b4_percent_define_get_loc],
391[m4_ifdef([b4_percent_define_loc(]$1[)],
392          [m4_pushdef([b4_loc], m4_indir([b4_percent_define_loc(]$1[)]))dnl
393b4_loc[]dnl
394m4_popdef([b4_loc])],
395          [b4_fatal([[undefined %%define variable `%s' passed to b4_percent_define_get_loc]], [$1])])])
396
397# b4_percent_define_get_syncline(VARIABLE)
398# ----------------------------------------
399# Mimic muscle_percent_define_get_syncline in ../src/muscle_tab.h exactly.
400# That is, if the %define variable VARIABLE is undefined, complain fatally
401# since that's a Bison or skeleton error.  Otherwise, return its definition
402# location as a b4_syncline invocation.  Don't record this as a Bison usage of
403# VARIABLE as there's no reason to suspect that the user-supplied value has yet
404# influenced the output.
405#
406# For example:
407#
408#   b4_percent_define_get_syncline([[foo]])
409m4_define([b4_percent_define_get_syncline],
410[m4_ifdef([b4_percent_define_syncline(]$1[)],
411          [m4_indir([b4_percent_define_syncline(]$1[)])],
412          [b4_fatal([[undefined %%define variable `%s' passed to b4_percent_define_get_syncline]], [$1])])])
413
414# b4_percent_define_ifdef(VARIABLE, IF-TRUE, [IF-FALSE])
415# ------------------------------------------------------
416# Mimic muscle_percent_define_ifdef in ../src/muscle_tab.h exactly.  That is,
417# if the %define variable VARIABLE is defined, expand IF-TRUE, else expand
418# IF-FALSE.  Also, record Bison's usage of VARIABLE by defining
419# b4_percent_define_bison_variables(VARIABLE).
420#
421# For example:
422#
423#   b4_percent_define_ifdef([[foo]], [[it's defined]], [[it's undefined]])
424m4_define([b4_percent_define_ifdef],
425[m4_ifdef([b4_percent_define(]$1[)],
426          [m4_define([b4_percent_define_bison_variables(]$1[)])$2],
427          [$3])])
428
429# b4_percent_define_flag_if(VARIABLE, IF-TRUE, [IF-FALSE])
430# --------------------------------------------------------
431# Mimic muscle_percent_define_flag_if in ../src/muscle_tab.h exactly.  That is,
432# if the %define variable VARIABLE is defined to "" or "true", expand IF-TRUE.
433# If it is defined to "false", expand IF-FALSE.  Complain if it is undefined
434# (a Bison or skeleton error since the default value should have been set
435# already) or defined to any other value (possibly a user error).  Also, record
436# Bison's usage of VARIABLE by defining
437# b4_percent_define_bison_variables(VARIABLE).
438#
439# For example:
440#
441#   b4_percent_define_flag_if([[foo]], [[it's true]], [[it's false]])
442m4_define([b4_percent_define_flag_if],
443[b4_percent_define_ifdef([$1],
444  [m4_case(b4_percent_define_get([$1]),
445           [], [$2], [true], [$2], [false], [$3],
446           [m4_expand_once([b4_complain_at(b4_percent_define_get_loc([$1]),
447                                           [[invalid value for %%define Boolean variable `%s']],
448                                           [$1])],
449                           [[b4_percent_define_flag_if($1)]])])],
450  [b4_fatal([[undefined %%define variable `%s' passed to b4_percent_define_flag_if]], [$1])])])
451
452# b4_percent_define_default(VARIABLE, DEFAULT)
453# --------------------------------------------
454# Mimic muscle_percent_define_default in ../src/muscle_tab.h exactly.  That is,
455# if the %define variable VARIABLE is undefined, set its value to DEFAULT.
456# Don't record this as a Bison usage of VARIABLE as there's no reason to
457# suspect that the value has yet influenced the output.
458#
459# For example:
460#
461#   b4_percent_define_default([[foo]], [[default value]])
462m4_define([b4_percent_define_default],
463[m4_ifndef([b4_percent_define(]$1[)],
464           [m4_define([b4_percent_define(]$1[)], [$2])dnl
465            m4_define([b4_percent_define_loc(]$1[)],
466                      [[[[<skeleton default value>:-1.-1]],
467                        [[<skeleton default value>:-1.-1]]]])dnl
468            m4_define([b4_percent_define_syncline(]$1[)], [[]])])])
469
470# b4_percent_define_check_values(VALUES)
471# --------------------------------------
472# Mimic muscle_percent_define_check_values in ../src/muscle_tab.h exactly
473# except that the VALUES structure is more appropriate for M4.  That is, VALUES
474# is a list of sublists of strings.  For each sublist, the first string is the
475# name of a %define variable, and all remaining strings in that sublist are the
476# valid values for that variable.  Complain if such a variable is undefined (a
477# Bison error since the default value should have been set already) or defined
478# to any other value (possibly a user error).  Don't record this as a Bison
479# usage of the variable as there's no reason to suspect that the value has yet
480# influenced the output.
481#
482# For example:
483#
484#   b4_percent_define_check_values([[[[foo]], [[foo-value1]], [[foo-value2]]]],
485#                                  [[[[bar]], [[bar-value1]]]])
486m4_define([b4_percent_define_check_values],
487[m4_foreach([b4_sublist], m4_quote($@),
488            [_b4_percent_define_check_values(b4_sublist)])])
489
490m4_define([_b4_percent_define_check_values],
491[m4_ifdef([b4_percent_define(]$1[)],
492  [m4_pushdef([b4_good_value], [0])dnl
493   m4_if($#, 1, [],
494         [m4_foreach([b4_value], m4_dquote(m4_shift($@)),
495                     [m4_if(m4_indir([b4_percent_define(]$1[)]), b4_value,
496                            [m4_define([b4_good_value], [1])])])])dnl
497   m4_if(b4_good_value, [0],
498         [b4_complain_at(b4_percent_define_get_loc([$1]),
499                         [[invalid value for %%define variable `%s': `%s']],
500                         [$1],
501                         m4_dquote(m4_indir([b4_percent_define(]$1[)])))])dnl
502   m4_popdef([b4_good_value])],
503  [b4_fatal([[undefined %%define variable `%s' passed to b4_percent_define_check_values]], [$1])])])
504
505# b4_percent_code_get([QUALIFIER])
506# --------------------------------
507# If any %code blocks for QUALIFIER are defined, emit them beginning with a
508# comment and ending with synclines and a newline.  If QUALIFIER is not
509# specified or empty, do this for the unqualified %code blocks.  Also, record
510# Bison's usage of QUALIFIER (if specified) by defining
511# b4_percent_code_bison_qualifiers(QUALIFIER).
512#
513# For example, to emit any unqualified %code blocks followed by any %code
514# blocks for the qualifier foo:
515#
516#   b4_percent_code_get
517#   b4_percent_code_get([[foo]])
518m4_define([b4_percent_code_get],
519[m4_pushdef([b4_macro_name], [[b4_percent_code(]$1[)]])dnl
520m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])dnl
521m4_ifdef(b4_macro_name,
522[b4_comment([m4_if([$#], [0], [[Unqualified %code]],
523                   [["%code ]$1["]])[ blocks.]])
524b4_user_code([m4_indir(b4_macro_name)])
525])dnl
526m4_popdef([b4_macro_name])])
527
528# b4_percent_code_ifdef(QUALIFIER, IF-TRUE, [IF-FALSE])
529# -----------------------------------------------------
530# If any %code blocks for QUALIFIER (or unqualified %code blocks if
531# QUALIFIER is empty) are defined, expand IF-TRUE, else expand IF-FALSE.
532# Also, record Bison's usage of QUALIFIER (if specified) by defining
533# b4_percent_code_bison_qualifiers(QUALIFIER).
534m4_define([b4_percent_code_ifdef],
535[m4_ifdef([b4_percent_code(]$1[)],
536          [m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])$2],
537          [$3])])
538
539
540## ----------------------------------------------------------- ##
541## After processing the skeletons, check that all the user's   ##
542## %define variables and %code qualifiers were used by Bison.  ##
543## ----------------------------------------------------------- ##
544
545m4_define([b4_check_user_names_wrap],
546[m4_ifdef([b4_percent_]$1[_user_]$2[s],
547          [b4_check_user_names([[%]$1 $2],
548                               [b4_percent_]$1[_user_]$2[s],
549                               [[b4_percent_]$1[_bison_]$2[s]])])])
550
551m4_wrap_lifo([
552b4_check_user_names_wrap([[define]], [[variable]])
553b4_check_user_names_wrap([[code]], [[qualifier]])
554])
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