-/* A jmpenv packages the state required to perform a proper non-local jump.
- * Note that there is a start_env initialized when perl starts, and top_env
- * points to this initially, so top_env should always be non-null.
- *
- * Existence of a non-null top_env->je_prev implies it is valid to call
- * longjmp() at that runlevel (we make sure start_env.je_prev is always
- * null to ensure this).
+#define SAVESTACK_POS() \
+ STMT_START { \
+ SSCHECK(2); \
+ SSPUSHINT(PL_stack_sp - PL_stack_base); \
+ SSPUSHINT(SAVEt_STACK_POS); \
+ } STMT_END
+
+#define SAVEOP() save_op()
+
+#define SAVEHINTS() \
+ STMT_START { \
+ SSCHECK(3); \
+ if (PL_hints & HINT_LOCALIZE_HH) { \
+ SSPUSHPTR(GvHV(PL_hintgv)); \
+ GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv)); \
+ } \
+ SSPUSHINT(PL_hints); \
+ SSPUSHINT(SAVEt_HINTS); \
+ } STMT_END
+
+#define SAVECOMPPAD() \
+ STMT_START { \
+ SSCHECK(2); \
+ SSPUSHPTR((SV*)PL_comppad); \
+ SSPUSHINT(SAVEt_COMPPAD); \
+ } STMT_END
+
+#define SAVESWITCHSTACK(f,t) \
+ STMT_START { \
+ SSCHECK(3); \
+ SSPUSHPTR((SV*)(f)); \
+ SSPUSHPTR((SV*)(t)); \
+ SSPUSHINT(SAVEt_SAVESWITCHSTACK); \
+ SWITCHSTACK((f),(t)); \
+ PL_curstackinfo->si_stack = (t); \
+ } STMT_END
+
+#ifdef USE_ITHREADS
+# define SAVECOPSTASH(c) SAVEPPTR(CopSTASHPV(c))
+# define SAVECOPSTASH_FREE(c) SAVESHAREDPV(CopSTASHPV(c))
+# define SAVECOPFILE(c) SAVEPPTR(CopFILE(c))
+# define SAVECOPFILE_FREE(c) SAVESHAREDPV(CopFILE(c))
+#else
+# define SAVECOPSTASH(c) SAVESPTR(CopSTASH(c))
+# define SAVECOPSTASH_FREE(c) SAVECOPSTASH(c) /* XXX not refcounted */
+# define SAVECOPFILE(c) SAVESPTR(CopFILEGV(c))
+# define SAVECOPFILE_FREE(c) SAVEGENERICSV(CopFILEGV(c))
+#endif
+
+#define SAVECOPLINE(c) SAVEI32(CopLINE(c))
+
+/* SSNEW() temporarily allocates a specified number of bytes of data on the
+ * savestack. It returns an integer index into the savestack, because a
+ * pointer would get broken if the savestack is moved on reallocation.
+ * SSNEWa() works like SSNEW(), but also aligns the data to the specified
+ * number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The
+ * alignment will be preserved therough savestack reallocation *only* if
+ * realloc returns data aligned to a size divisible by `align'!