Import Ghostscript 9.50ghostscript-9.50

Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/psi/iesdata.h b/psi/iesdata.h
new file mode 100644
index 00000000..68180bbb
--- /dev/null
+++ b/psi/iesdata.h
@@ -0,0 +1,52 @@
+/* Copyright (C) 2001-2019 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
+   CA 94945, U.S.A., +1(415)492-9861, for further information.
+*/
+
+
+/* Generic execution stack structure definition */
+
+#ifndef iesdata_INCLUDED
+#  define iesdata_INCLUDED
+
+#include "isdata.h"
+
+/* Define the execution stack structure. */
+typedef struct exec_stack_s {
+
+    ref_stack_t stack;		/* the actual execution stack */
+
+/*
+ * To improve performance, we cache the currentfile pointer
+ * (i.e., `shallow-bind' it in Lisp terminology).  The invariant is as
+ * follows: either esfile points to the currentfile slot on the estack
+ * (i.e., the topmost slot with an executable file), or it is 0.
+ * To maintain the invariant, it is sufficient that whenever a routine
+ * pushes or pops anything on the estack, if the object *might* be
+ * an executable file, invoke esfile_clear_cache(); alternatively,
+ * immediately after pushing an object, invoke esfile_check_cache().
+ */
+    ref *current_file;
+
+} exec_stack_t;
+
+/*
+ * current_file is cleared by garbage collection, so we don't declare it
+ * as a pointer.
+ */
+#define public_st_exec_stack()	/* in interp.c */\
+  gs_public_st_suffix_add0(st_exec_stack, exec_stack_t, "exec_stack_t",\
+    exec_stack_enum_ptrs, exec_stack_reloc_ptrs, st_ref_stack)
+#define st_exec_stack_num_ptrs st_ref_stack_num_ptrs
+
+#endif /* iesdata_INCLUDED */