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ruby.h: fix for old clang

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* include/ruby/ruby.h (rb_scan_args): add nul padding here to
  apply to all references.

* include/ruby/ruby.h (rb_scan_args_verify): move length mismatch
  check outside conditional operators.

Since old clang cannot optimize away string literal dereference by
an immediate index, e.g., ""[0], and both of true and false side
expressions are compiled and warned unintentionally.  With such
old compilers, the check in rb_scan_args() does not work but may
result unpredictable value if the format is wrong.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55176 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2016-05-26 15:39:43 +00:00
parent a1d9afc295
commit 08fefd70e5
2 changed files with 23 additions and 9 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
Fri May 27 00:39:40 2016 Nobuyoshi Nakada <nobu@ruby-lang.org>
* include/ruby/ruby.h (rb_scan_args): add nul padding here to
apply to all references.
* include/ruby/ruby.h (rb_scan_args_verify): move length mismatch
check outside conditional operators.
Thu May 26 14:21:10 2016 Kazuki Yamaguchi <k@rhe.jp>
* ext/openssl/ossl_pkey_dh.c (ossl_dh_compute_key): Check that the DH

24
include/ruby/ruby.h
View file

@ -2153,21 +2153,22 @@ int ruby_vsnprintf(char *str, size_t n, char const *fmt, va_list ap);
#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P) && defined(__OPTIMIZE__)
# define rb_scan_args(argc,argvp,fmt,...) \
__builtin_choose_expr(__builtin_constant_p(fmt), \
rb_scan_args0(argc,argv,fmt,(sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)),((VALUE*[]){__VA_ARGS__})), \
rb_scan_args0(argc,argv,fmt"\0\0\0\0\0\0",\
(sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)), \
((VALUE*[]){__VA_ARGS__})), \
rb_scan_args(argc,argvp,fmt,__VA_ARGS__))
# if HAVE_ATTRIBUTE_ERRORFUNC
ERRORFUNC(("bad scan arg format"), int rb_scan_args_bad_format(const char*));
ERRORFUNC(("variable argument length doesn't match"), int rb_scan_args_length_mismatch(int,int));
ERRORFUNC(("variable argument length doesn't match"), int rb_scan_args_length_mismatch(const char*,int));
# else
# define rb_scan_args_bad_format(fmt) 0
# define rb_scan_args_length_mismatch(vari, varc) 0
# define rb_scan_args_length_mismatch(fmt, varc) 0
# endif
# define rb_scan_args_isdigit(c) ((unsigned char)((c)-'0')<10)
# define rb_scan_args_count_end(fmt, ofs, varc, vari) \
(((varc) \
/(!fmt[ofs] || rb_scan_args_bad_format(fmt))) \
/((varc)==(vari) || rb_scan_args_length_mismatch(vari, varc)))
((vari)/(!fmt[ofs] || rb_scan_args_bad_format(fmt)))
# define rb_scan_args_count_block(fmt, ofs, varc, vari) \
(fmt[ofs]!='&' ? \
@ -2194,10 +2195,15 @@ ERRORFUNC(("variable argument length doesn't match"), int rb_scan_args_length_mi
rb_scan_args_count_var(fmt, ofs, varc, vari) : \
rb_scan_args_count_var(fmt, ofs+1, varc, vari+fmt[ofs]-'0'))
# define rb_scan_args_verify(fmt, varc) \
((!rb_scan_args_isdigit(fmt[0]) ? \
rb_scan_args_count_var(fmt, 0, varc, 0) : \
rb_scan_args_count_opt(fmt, 1, varc, fmt[0]-'0')) \
== (varc) || \
rb_scan_args_length_mismatch(fmt, varc))
# define rb_scan_args_count(fmt, varc) \
(!rb_scan_args_isdigit(fmt[0]) ? \
rb_scan_args_count_var(fmt"\0\0\0\0", 0, varc, 0) : \
rb_scan_args_count_opt(fmt"\0\0\0\0\0\0", 1, varc, fmt[0]-'0'))
((varc)/(rb_scan_args_verify(fmt, varc)))
# define rb_scan_args_lead_p(fmt) rb_scan_args_isdigit(fmt[0])
# define rb_scan_args_n_lead(fmt) (rb_scan_args_lead_p(fmt) ? fmt[0]-'0' : 0)