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Import new gnulib.

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Vladimir 'phcoder' Serbinenko 2013-04-11 21:12:46 +02:00
parent 93cd84df63
commit 053cfcddf1
255 changed files with 12578 additions and 4948 deletions
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150
grub-core/gnulib/verify.h
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@ -1,6 +1,6 @@
/* Compile-time assert-like macros.
Copyright (C) 2005-2006, 2009-2010 Free Software Foundation, Inc.
Copyright (C) 2005-2006, 2009-2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -17,21 +17,39 @@
/* Written by Paul Eggert, Bruno Haible, and Jim Meyering. */
#ifndef VERIFY_H
# define VERIFY_H 1
#ifndef _GL_VERIFY_H
# define _GL_VERIFY_H
/* Define _GL_HAVE__STATIC_ASSERT to 1 if _Static_assert works as per C11.
This is supported by GCC 4.6.0 and later, in C mode, and its use
here generates easier-to-read diagnostics when verify (R) fails.
Define _GL_HAVE_STATIC_ASSERT to 1 if static_assert works as per C++11.
This will likely be supported by future GCC versions, in C++ mode.
Use this only with GCC. If we were willing to slow 'configure'
down we could also use it with other compilers, but since this
affects only the quality of diagnostics, why bother? */
# if (4 < __GNUC__ || (__GNUC__ == 4 && 6 <= __GNUC_MINOR__)) && !defined __cplusplus
# define _GL_HAVE__STATIC_ASSERT 1
# endif
/* The condition (99 < __GNUC__) is temporary, until we know about the
first G++ release that supports static_assert. */
# if (99 < __GNUC__) && defined __cplusplus
# define _GL_HAVE_STATIC_ASSERT 1
# endif
/* Each of these macros verifies that its argument R is nonzero. To
be portable, R should be an integer constant expression. Unlike
assert (R), there is no run-time overhead.
There are two macros, since no single macro can be used in all
contexts in C. verify_true (R) is for scalar contexts, including
integer constant expression contexts. verify (R) is for declaration
contexts, e.g., the top level.
If _Static_assert works, verify (R) uses it directly. Similarly,
_GL_VERIFY_TRUE works by packaging a _Static_assert inside a struct
that is an operand of sizeof.
Symbols ending in "__" are private to this header.
The code below uses several ideas.
The code below uses several ideas for C++ compilers, and for C
compilers that do not support _Static_assert:
* The first step is ((R) ? 1 : -1). Given an expression R, of
integral or boolean or floating-point type, this yields an
@ -39,7 +57,9 @@
constant and nonnegative.
* Next this expression W is wrapped in a type
struct verify_type__ { unsigned int verify_error_if_negative_size__: W; }.
struct _gl_verify_type {
unsigned int _gl_verify_error_if_negative: W;
}.
If W is negative, this yields a compile-time error. No compiler can
deal with a bit-field of negative size.
@ -53,7 +73,7 @@
void function (int n) { verify (n < 0); }
* For the verify macro, the struct verify_type__ will need to
* For the verify macro, the struct _gl_verify_type will need to
somehow be embedded into a declaration. To be portable, this
declaration must declare an object, a constant, a function, or a
typedef name. If the declared entity uses the type directly,
@ -91,11 +111,11 @@
Which of the following alternatives can be used?
extern int dummy [sizeof (struct {...})];
extern int dummy [sizeof (struct verify_type__ {...})];
extern int dummy [sizeof (struct _gl_verify_type {...})];
extern void dummy (int [sizeof (struct {...})]);
extern void dummy (int [sizeof (struct verify_type__ {...})]);
extern void dummy (int [sizeof (struct _gl_verify_type {...})]);
extern int (*dummy (void)) [sizeof (struct {...})];
extern int (*dummy (void)) [sizeof (struct verify_type__ {...})];
extern int (*dummy (void)) [sizeof (struct _gl_verify_type {...})];
In the second and sixth case, the struct type is exported to the
outer scope; two such declarations therefore collide. GCC warns
@ -105,19 +125,17 @@
extern int (*dummy (void)) [sizeof (struct {...})];
* GCC warns about duplicate declarations of the dummy function if
-Wredundant_decls is used. GCC 4.3 and later have a builtin
-Wredundant-decls is used. GCC 4.3 and later have a builtin
__COUNTER__ macro that can let us generate unique identifiers for
each dummy function, to suppress this warning.
* This implementation exploits the fact that GCC does not warn about
the last declaration mentioned above. If a future version of GCC
introduces a warning for this, the problem could be worked around
by using code specialized to GCC, just as __COUNTER__ is already
being used if available.
* This implementation exploits the fact that older versions of GCC,
which do not support _Static_assert, also do not warn about the
last declaration mentioned above.
#if 4 <= __GNUC__
# define verify(R) [another version to keep GCC happy]
#endif
* GCC warns if -Wnested-externs is enabled and verify() is used
within a function body; but inside a function, you can always
arrange to use verify_expr() instead.
* In C++, any struct definition inside sizeof is invalid.
Use a template type to work around the problem. */
@ -140,24 +158,88 @@
possible. */
# define _GL_GENSYM(prefix) _GL_CONCAT (prefix, _GL_COUNTER)
/* Verify requirement R at compile-time, as an integer constant expression.
Return 1. */
/* Verify requirement R at compile-time, as an integer constant expression
that returns 1. If R is false, fail at compile-time, preferably
with a diagnostic that includes the string-literal DIAGNOSTIC. */
# define _GL_VERIFY_TRUE(R, DIAGNOSTIC) \
(!!sizeof (_GL_VERIFY_TYPE (R, DIAGNOSTIC)))
# ifdef __cplusplus
# if !GNULIB_defined_struct__gl_verify_type
template <int w>
struct verify_type__ { unsigned int verify_error_if_negative_size__: w; };
# define verify_true(R) \
(!!sizeof (verify_type__<(R) ? 1 : -1>))
struct _gl_verify_type {
unsigned int _gl_verify_error_if_negative: w;
};
# define GNULIB_defined_struct__gl_verify_type 1
# endif
# define _GL_VERIFY_TYPE(R, DIAGNOSTIC) \
_gl_verify_type<(R) ? 1 : -1>
# elif defined _GL_HAVE__STATIC_ASSERT
# define _GL_VERIFY_TYPE(R, DIAGNOSTIC) \
struct { \
_Static_assert (R, DIAGNOSTIC); \
int _gl_dummy; \
}
# else
# define verify_true(R) \
(!!sizeof \
(struct { unsigned int verify_error_if_negative_size__: (R) ? 1 : -1; }))
# define _GL_VERIFY_TYPE(R, DIAGNOSTIC) \
struct { unsigned int _gl_verify_error_if_negative: (R) ? 1 : -1; }
# endif
/* Verify requirement R at compile-time, as a declaration without a
trailing ';'. If R is false, fail at compile-time, preferably
with a diagnostic that includes the string-literal DIAGNOSTIC.
Unfortunately, unlike C11, this implementation must appear as an
ordinary declaration, and cannot appear inside struct { ... }. */
# ifdef _GL_HAVE__STATIC_ASSERT
# define _GL_VERIFY _Static_assert
# else
# define _GL_VERIFY(R, DIAGNOSTIC) \
extern int (*_GL_GENSYM (_gl_verify_function) (void)) \
[_GL_VERIFY_TRUE (R, DIAGNOSTIC)]
# endif
/* _GL_STATIC_ASSERT_H is defined if this code is copied into assert.h. */
# ifdef _GL_STATIC_ASSERT_H
# if !defined _GL_HAVE__STATIC_ASSERT && !defined _Static_assert
# define _Static_assert(R, DIAGNOSTIC) _GL_VERIFY (R, DIAGNOSTIC)
# endif
# if !defined _GL_HAVE_STATIC_ASSERT && !defined static_assert
# define static_assert _Static_assert /* C11 requires this #define. */
# endif
# endif
/* @assert.h omit start@ */
/* Each of these macros verifies that its argument R is nonzero. To
be portable, R should be an integer constant expression. Unlike
assert (R), there is no run-time overhead.
There are two macros, since no single macro can be used in all
contexts in C. verify_true (R) is for scalar contexts, including
integer constant expression contexts. verify (R) is for declaration
contexts, e.g., the top level. */
/* Verify requirement R at compile-time, as an integer constant expression.
Return 1. This is equivalent to verify_expr (R, 1).
verify_true is obsolescent; please use verify_expr instead. */
# define verify_true(R) _GL_VERIFY_TRUE (R, "verify_true (" #R ")")
/* Verify requirement R at compile-time. Return the value of the
expression E. */
# define verify_expr(R, E) \
(_GL_VERIFY_TRUE (R, "verify_expr (" #R ", " #E ")") ? (E) : (E))
/* Verify requirement R at compile-time, as a declaration without a
trailing ';'. */
# define verify(R) \
extern int (* _GL_GENSYM (verify_function) (void)) [verify_true (R)]
# define verify(R) _GL_VERIFY (R, "verify (" #R ")")
/* @assert.h omit end@ */
#endif