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Cast result of copyObject() to correct type

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copyObject() is declared to return void *, which allows easily assigning
the result independent of the input, but it loses all type checking.

If the compiler supports typeof or something similar, cast the result to
the input type.  This creates a greater amount of type safety.  In some
cases, where the result is assigned to a generic type such as Node * or
Expr *, new casts are now necessary, but in general casts are now
unnecessary in the normal case and indicate that something unusual is
happening.

Reviewed-by: Mark Dilger <hornschnorter@gmail.com>
This commit is contained in:
Peter Eisentraut
2017-03-09 15:18:59 -05:00
parent 66b764341b
commit 4cb824699e
36 changed files with 178 additions and 92 deletions
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27
config/c-compiler.m4
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@ -178,6 +178,33 @@ fi])# PGAC_C_STATIC_ASSERT
# PGAC_C_TYPEOF
# -------------
# Check if the C compiler understands typeof or a variant. Define
# HAVE_TYPEOF if so, and define 'typeof' to the actual key word.
#
AC_DEFUN([PGAC_C_TYPEOF],
[AC_CACHE_CHECK(for typeof, pgac_cv_c_typeof,
[pgac_cv_c_typeof=no
for pgac_kw in typeof __typeof__ decltype; do
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[int x = 0;
$pgac_kw(x) y;
y = x;
return y;])],
[pgac_cv_c_typeof=$pgac_kw])
test "$pgac_cv_c_typeof" != no && break
done])
if test "$pgac_cv_c_typeof" != no; then
AC_DEFINE(HAVE_TYPEOF, 1,
[Define to 1 if your compiler understands `typeof' or something similar.])
if test "$pgac_cv_c_typeof" != typeof; then
AC_DEFINE(typeof, $pgac_cv_c_typeof, [Define to how the compiler spells `typeof'.])
fi
fi])# PGAC_C_TYPEOF
# PGAC_C_TYPES_COMPATIBLE
# -----------------------
# Check if the C compiler understands __builtin_types_compatible_p,