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+/* Manipulation of formal and actual parameters of functions and function
+   calls.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef IPA_PARAM_MANIPULATION_H
+#define IPA_PARAM_MANIPULATION_H
+
+/* Operation to be performed for the parameter in ipa_parm_adjustment
+   below.  */
+enum ipa_parm_op {
+  IPA_PARM_OP_NONE,
+
+  /* This describes a brand new parameter.
+
+     The field `type' should be set to the new type, `arg_prefix'
+     should be set to the string prefix for the new DECL_NAME, and
+     `new_decl' will ultimately hold the newly created argument.  */
+  IPA_PARM_OP_NEW,
+
+  /* This new parameter is an unmodified parameter at index base_index. */
+  IPA_PARM_OP_COPY,
+
+  /* This adjustment describes a parameter that is about to be removed
+     completely.  Most users will probably need to book keep those so that they
+     don't leave behinfd any non default def ssa names belonging to them.  */
+  IPA_PARM_OP_REMOVE
+};
+
+/* Structure to describe transformations of formal parameters and actual
+   arguments.  Each instance describes one new parameter and they are meant to
+   be stored in a vector.  Additionally, most users will probably want to store
+   adjustments about parameters that are being removed altogether so that SSA
+   names belonging to them can be replaced by SSA names of an artificial
+   variable.  */
+struct ipa_parm_adjustment
+{
+  /* The original PARM_DECL itself, helpful for processing of the body of the
+     function itself.  Intended for traversing function bodies.
+     ipa_modify_formal_parameters, ipa_modify_call_arguments and
+     ipa_combine_adjustments ignore this and use base_index.
+     ipa_modify_formal_parameters actually sets this.  */
+  tree base;
+
+  /* Type of the new parameter.  However, if by_ref is true, the real type will
+     be a pointer to this type.  */
+  tree type;
+
+  /* Alias refrerence type to be used in MEM_REFs when adjusting caller
+     arguments.  */
+  tree alias_ptr_type;
+
+  /* The new declaration when creating/replacing a parameter.  Created
+     by ipa_modify_formal_parameters, useful for functions modifying
+     the body accordingly.  For brand new arguments, this is the newly
+     created argument.  */
+  tree new_decl;
+
+  /* New declaration of a substitute variable that we may use to replace all
+     non-default-def ssa names when a parm decl is going away.  */
+  tree new_ssa_base;
+
+  /* If non-NULL and the original parameter is to be removed (copy_param below
+     is NULL), this is going to be its nonlocalized vars value.  */
+  tree nonlocal_value;
+
+  /* This holds the prefix to be used for the new DECL_NAME.  */
+  const char *arg_prefix;
+
+  /* Offset into the original parameter (for the cases when the new parameter
+     is a component of an original one).  */
+  poly_int64_pod offset;
+
+  /* Zero based index of the original parameter this one is based on.  */
+  int base_index;
+
+  /* Whether this parameter is a new parameter, a copy of an old one,
+     or one about to be removed.  */
+  enum ipa_parm_op op;
+
+  /* Storage order of the original parameter (for the cases when the new
+     parameter is a component of an original one).  */
+  unsigned reverse : 1;
+
+  /* The parameter is to be passed by reference.  */
+  unsigned by_ref : 1;
+};
+
+typedef vec<ipa_parm_adjustment> ipa_parm_adjustment_vec;
+
+vec<tree> ipa_get_vector_of_formal_parms (tree fndecl);
+vec<tree> ipa_get_vector_of_formal_parm_types (tree fntype);
+void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec);
+void ipa_modify_call_arguments (struct cgraph_edge *, gcall *,
+				ipa_parm_adjustment_vec);
+ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec,
+						 ipa_parm_adjustment_vec);
+void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree);
+
+bool ipa_modify_expr (tree *, bool, ipa_parm_adjustment_vec);
+ipa_parm_adjustment *ipa_get_adjustment_candidate (tree **, bool *,
+						   ipa_parm_adjustment_vec,
+						   bool);
+
+#endif	/* IPA_PARAM_MANIPULATION_H */