PageRenderTime 12ms CodeModel.GetById 7ms app.highlight 1ms RepoModel.GetById 2ms app.codeStats 0ms

/usr.bin/yacc/NEW_FEATURES

https://bitbucket.org/freebsd/freebsd-head/
#! | 48 lines | 36 code | 12 blank | 0 comment | 0 complexity | aa9372d82400a71966db1cd160877c83 MD5 | raw file
 1$FreeBSD$
 2
 3     The -r option has been implemented.  The -r option tells Yacc to
 4put the read-only tables in y.tab.c and the code and variables in
 5y.code.c.  Keith Bostic asked for this option so that :yyfix could be
 6eliminated.
 7
 8     The -l and -t options have been implemented.  The -l option tells
 9Yacc not to include #line directives in the code it produces.  The -t
10option causes debugging code to be included in the compiled parser.
11
12     The code for error recovery has been changed to implement the same
13algorithm as AT&T Yacc.  There will still be differences in the way
14error recovery works because AT&T Yacc uses more default reductions
15than Berkeley Yacc.
16
17     The environment variable TMPDIR determines the directory where
18temporary files will be created.  If TMPDIR is defined, temporary files
19will be created in the directory whose pathname is the value of TMPDIR.
20By default, temporary files are created in /tmp.
21
22     The keywords are now case-insensitive.  For example, %nonassoc,
23%NONASSOC, %NonAssoc, and %nOnAsSoC are all equivalent.
24
25     Commas and semicolons that are not part of C code are treated as
26commentary.
27
28     Line-end comments, as in BCPL, are permitted.  Line-end comments
29begin with // and end at the next end-of-line.  Line-end comments are
30permitted in C code; they are converted to C comments on output.
31
32     The form of y.output files has been changed to look more like
33those produced by AT&T Yacc.
34
35     A new kind of declaration has been added.  The form of the declaration
36is
37
38	  %ident string
39
40where string is a sequence of characters beginning with a double quote
41and ending with either a double quote or the next end-of-line, whichever
42comes first.  The declaration will cause a #ident directive to be written
43near the start of the output file.
44
45     If a parser has been compiled with debugging code, that code can be
46enabled by setting an environment variable.  If the environment variable
47YYDEBUG is set to 0, debugging output is suppressed.  If it is set to 1,
48debugging output is written to standard output.