+#define isWARN_on(c,x) (PerlWarnIsSet_((U8 *)(c + 1), 2*(x)))
+#define isWARNf_on(c,x) (PerlWarnIsSet_((U8 *)(c + 1), 2*(x)+1))
+
+#define DUP_WARNINGS(p) Perl_dup_warnings(aTHX_ p)
+
+#define free_and_set_cop_warnings(cmp,w) STMT_START { \
+ if (!specialWARN((cmp)->cop_warnings)) PerlMemShared_free((cmp)->cop_warnings); \
+ (cmp)->cop_warnings = w; \
+} STMT_END
+
+/*
+
+=head1 Warning and Dieing
+
+In all these calls, the C<U32 wI<n>> parameters are warning category
+constants. You can see the ones currently available in
+L<warnings/Category Hierarchy>, just capitalize all letters in the names
+and prefix them by C<WARN_>. So, for example, the category C<void> used in a
+perl program becomes C<WARN_VOID> when used in XS code and passed to one of
+the calls below.
+
+=for apidoc Am|bool|ckWARN|U32 w
+=for apidoc_item ||ckWARN2|U32 w1|U32 w2
+=for apidoc_item ||ckWARN3|U32 w1|U32 w2|U32 w3
+=for apidoc_item ||ckWARN4|U32 w1|U32 w2|U32 w3|U32 w4
+These return a boolean as to whether or not warnings are enabled for any of
+the warning category(ies) parameters: C<w>, C<w1>, ....
+
+Should any of the categories by default be enabled even if not within the
+scope of S<C<use warnings>>, instead use the C<L</ckWARN_d>> macros.
+
+The categories must be completely independent, one may not be subclassed from
+the other.
+
+=for apidoc Am|bool|ckWARN_d|U32 w
+=for apidoc_item ||ckWARN2_d|U32 w1|U32 w2
+=for apidoc_item ||ckWARN3_d|U32 w1|U32 w2|U32 w3
+=for apidoc_item ||ckWARN4_d|U32 w1|U32 w2|U32 w3|U32 w4
+
+Like C<L</ckWARN>>, but for use if and only if the warning category(ies) is by
+default enabled even if not within the scope of S<C<use warnings>>.
+
+=for apidoc Am|U32|packWARN|U32 w1
+=for apidoc_item ||packWARN2|U32 w1|U32 w2
+=for apidoc_item ||packWARN3|U32 w1|U32 w2|U32 w3
+=for apidoc_item ||packWARN4|U32 w1|U32 w2|U32 w3|U32 w4
+
+These macros are used to pack warning categories into a single U32 to pass to
+macros and functions that take a warning category parameter. The number of
+categories to pack is given by the name, with a corresponding number of
+category parameters passed.
+
+=cut
+
+*/
+
+#define ckWARN(w) Perl_ckwarn(aTHX_ packWARN(w))
+
+/* The w1, w2 ... should be independent warnings categories; one shouldn't be
+ * a subcategory of any other */
+
+#define ckWARN2(w1,w2) Perl_ckwarn(aTHX_ packWARN2(w1,w2))
+#define ckWARN3(w1,w2,w3) Perl_ckwarn(aTHX_ packWARN3(w1,w2,w3))
+#define ckWARN4(w1,w2,w3,w4) Perl_ckwarn(aTHX_ packWARN4(w1,w2,w3,w4))
+
+#define ckWARN_d(w) Perl_ckwarn_d(aTHX_ packWARN(w))
+#define ckWARN2_d(w1,w2) Perl_ckwarn_d(aTHX_ packWARN2(w1,w2))
+#define ckWARN3_d(w1,w2,w3) Perl_ckwarn_d(aTHX_ packWARN3(w1,w2,w3))
+#define ckWARN4_d(w1,w2,w3,w4) Perl_ckwarn_d(aTHX_ packWARN4(w1,w2,w3,w4))
+
+#define WARNshift 8
+
+#define packWARN(a) (a )
+
+/* The a, b, ... should be independent warnings categories; one shouldn't be
+ * a subcategory of any other */
+
+#define packWARN2(a,b) ((a) | ((b)<<8) )
+#define packWARN3(a,b,c) ((a) | ((b)<<8) | ((c)<<16) )
+#define packWARN4(a,b,c,d) ((a) | ((b)<<8) | ((c)<<16) | ((d) <<24))
+
+#define unpackWARN1(x) ((U8) (x) )
+#define unpackWARN2(x) ((U8) ((x) >> 8))
+#define unpackWARN3(x) ((U8) ((x) >> 16))
+#define unpackWARN4(x) ((U8) ((x) >> 24))
+
+#define ckDEAD(x) \
+ (PL_curcop && \
+ !specialWARN(PL_curcop->cop_warnings) && \
+ (isWARNf_on(PL_curcop->cop_warnings, unpackWARN1(x)) || \
+ (unpackWARN2(x) && \
+ (isWARNf_on(PL_curcop->cop_warnings, unpackWARN2(x)) || \
+ (unpackWARN3(x) && \
+ (isWARNf_on(PL_curcop->cop_warnings, unpackWARN3(x)) || \
+ (unpackWARN4(x) && \
+ isWARNf_on(PL_curcop->cop_warnings, unpackWARN4(x)))))))))
+
+
+
+/*
+=for apidoc Amnh||WARN_ALL
+=for apidoc Amnh||WARN_CLOSURE
+=for apidoc Amnh||WARN_DEPRECATED
+=for apidoc Amnh||WARN_EXITING
+=for apidoc Amnh||WARN_GLOB
+=for apidoc Amnh||WARN_IO
+=for apidoc Amnh||WARN_CLOSED
+=for apidoc Amnh||WARN_EXEC
+=for apidoc Amnh||WARN_LAYER
+=for apidoc Amnh||WARN_NEWLINE
+=for apidoc Amnh||WARN_PIPE
+=for apidoc Amnh||WARN_UNOPENED
+=for apidoc Amnh||WARN_MISC
+=for apidoc Amnh||WARN_NUMERIC
+=for apidoc Amnh||WARN_ONCE
+=for apidoc Amnh||WARN_OVERFLOW
+=for apidoc Amnh||WARN_PACK
+=for apidoc Amnh||WARN_PORTABLE
+=for apidoc Amnh||WARN_RECURSION
+=for apidoc Amnh||WARN_REDEFINE
+=for apidoc Amnh||WARN_REGEXP
+=for apidoc Amnh||WARN_SEVERE
+=for apidoc Amnh||WARN_DEBUGGING
+=for apidoc Amnh||WARN_INPLACE
+=for apidoc Amnh||WARN_INTERNAL
+=for apidoc Amnh||WARN_MALLOC
+=for apidoc Amnh||WARN_SIGNAL
+=for apidoc Amnh||WARN_SUBSTR
+=for apidoc Amnh||WARN_SYNTAX
+=for apidoc Amnh||WARN_AMBIGUOUS
+=for apidoc Amnh||WARN_BAREWORD
+=for apidoc Amnh||WARN_DIGIT
+=for apidoc Amnh||WARN_PARENTHESIS
+=for apidoc Amnh||WARN_PRECEDENCE
+=for apidoc Amnh||WARN_PRINTF
+=for apidoc Amnh||WARN_PROTOTYPE
+=for apidoc Amnh||WARN_QW
+=for apidoc Amnh||WARN_RESERVED
+=for apidoc Amnh||WARN_SEMICOLON
+=for apidoc Amnh||WARN_TAINT
+=for apidoc Amnh||WARN_THREADS
+=for apidoc Amnh||WARN_UNINITIALIZED
+=for apidoc Amnh||WARN_UNPACK
+=for apidoc Amnh||WARN_UNTIE
+=for apidoc Amnh||WARN_UTF8
+=for apidoc Amnh||WARN_VOID
+=for apidoc Amnh||WARN_IMPRECISION
+=for apidoc Amnh||WARN_ILLEGALPROTO
+=for apidoc Amnh||WARN_NON_UNICODE
+=for apidoc Amnh||WARN_NONCHAR
+=for apidoc Amnh||WARN_SURROGATE
+=for apidoc Amnh||WARN_EXPERIMENTAL
+=for apidoc Amnh||WARN_EXPERIMENTAL__LEXICAL_SUBS
+=for apidoc Amnh||WARN_EXPERIMENTAL__REGEX_SETS
+=for apidoc Amnh||WARN_EXPERIMENTAL__SMARTMATCH
+=for apidoc Amnh||WARN_EXPERIMENTAL__POSTDEREF
+=for apidoc Amnh||WARN_EXPERIMENTAL__SIGNATURES
+=for apidoc Amnh||WARN_SYSCALLS
+=for apidoc Amnh||WARN_EXPERIMENTAL__BITWISE
+=for apidoc Amnh||WARN_EXPERIMENTAL__CONST_ATTR
+=for apidoc Amnh||WARN_EXPERIMENTAL__RE_STRICT
+=for apidoc Amnh||WARN_EXPERIMENTAL__REFALIASING
+=for apidoc Amnh||WARN_LOCALE
+=for apidoc Amnh||WARN_MISSING
+=for apidoc Amnh||WARN_REDUNDANT
+=for apidoc Amnh||WARN_EXPERIMENTAL__DECLARED_REFS
+=for apidoc Amnh||WARN_EXPERIMENTAL__ALPHA_ASSERTIONS
+=for apidoc Amnh||WARN_EXPERIMENTAL__SCRIPT_RUN
+=for apidoc Amnh||WARN_SHADOW
+=for apidoc Amnh||WARN_EXPERIMENTAL__PRIVATE_USE
+=for apidoc Amnh||WARN_EXPERIMENTAL__UNIPROP_WILDCARDS
+=for apidoc Amnh||WARN_EXPERIMENTAL__VLB
+=for apidoc Amnh||WARN_EXPERIMENTAL__ISA
+=for apidoc Amnh||WARN_EXPERIMENTAL__TRY
+=for apidoc Amnh||WARN_EXPERIMENTAL__ARGS_ARRAY_WITH_SIGNATURES
+=for apidoc Amnh||WARN_EXPERIMENTAL__BUILTIN
+=for apidoc Amnh||WARN_EXPERIMENTAL__DEFER
+=for apidoc Amnh||WARN_EXPERIMENTAL__EXTRA_PAIRED_DELIMITERS
+=for apidoc Amnh||WARN_EXPERIMENTAL__FOR_LIST
+=for apidoc Amnh||WARN_SCALAR
+
+=cut
+*/