Implemented project structure

xpack-riscv-none-elf-gcc-13.4.0-1/lib/gcc/riscv-none-elf/13.4.0/plugin/include/domwalk.h

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+/* Generic dominator tree walker
+   Copyright (C) 2003-2023 Free Software Foundation, Inc.
+   Contributed by Diego Novillo <dnovillo@redhat.com>
+
+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 GCC_DOM_WALK_H
+#define GCC_DOM_WALK_H
+
+/**
+ * This is the main class for the dominator walker. It is expected that
+ * consumers will have a custom class inheriting from it, which will over ride
+ * at least one of before_dom_children and after_dom_children to implement the
+ * custom behavior.
+ */
+class dom_walker
+{
+public:
+  static const edge STOP;
+
+  /* An enum for determining whether the dom walk should be constrained to
+     blocks reachable by executable edges.  */
+
+  enum reachability
+  {
+    /* Walk all blocks within the CFG.  */
+    ALL_BLOCKS,
+
+    /* Use REACHABLE_BLOCKS when your subclass can discover that some edges
+       are not executable.
+
+       If a subclass can discover that a COND, SWITCH or GOTO has a static
+       target in the before_dom_children callback, the taken edge should
+       be returned.  The generic walker will clear EDGE_EXECUTABLE on all
+       edges it can determine are not executable.
+
+       With REACHABLE_BLOCKS, EDGE_EXECUTABLE will be set on every edge in
+       the dom_walker ctor; the flag will then be cleared on edges that are
+       determined to be not executable.  */
+    REACHABLE_BLOCKS,
+
+    /* Identical to REACHABLE_BLOCKS, but the initial state of EDGE_EXECUTABLE
+       will instead be preserved in the ctor, allowing for information about
+       non-executable edges to be merged in from an earlier analysis (and
+       potentially for additional edges to be marked as non-executable).  */
+    REACHABLE_BLOCKS_PRESERVING_FLAGS
+  };
+
+  /* You can provide a mapping of basic-block index to RPO if you
+     have that readily available or you do multiple walks.  If you
+     specify NULL as BB_INDEX_TO_RPO this mapping will be computed
+     lazily at walk time.  If you specify -1 dominator children will
+     not be walked in RPO order.  */
+  dom_walker (cdi_direction direction, enum reachability = ALL_BLOCKS,
+	      int *bb_index_to_rpo = NULL);
+
+  ~dom_walker ();
+
+  /* Walk the dominator tree.  */
+  void walk (basic_block);
+
+  /* Function to call before the recursive walk of the dominator children.
+
+     Return value is the always taken edge if the block has multiple outgoing
+     edges, NULL otherwise.  When skipping unreachable blocks, the walker
+     uses the taken edge information to clear EDGE_EXECUTABLE on the other
+     edges, exposing unreachable blocks.  A NULL return value means all
+     outgoing edges should still be considered executable.  A return value
+     of STOP means to stop the domwalk from processing dominated blocks from
+     here.  This can be used to process a SEME region only (note domwalk
+     will still do work linear in function size).  */
+  virtual edge before_dom_children (basic_block) { return NULL; }
+
+  /* Function to call after the recursive walk of the dominator children.  */
+  virtual void after_dom_children (basic_block) {}
+
+private:
+  /* This is the direction of the dominator tree we want to walk.  i.e.,
+     if it is set to CDI_DOMINATORS, then we walk the dominator tree,
+     if it is set to CDI_POST_DOMINATORS, then we walk the post
+     dominator tree.  */
+  const ENUM_BITFIELD (cdi_direction) m_dom_direction : 2;
+  const ENUM_BITFIELD (reachability) m_reachability : 2;
+  bool m_user_bb_to_rpo;
+  basic_block m_unreachable_dom;
+  int *m_bb_to_rpo;
+
+  /* Query whether or not the given block is reachable or not.  */
+  bool bb_reachable (struct function *, basic_block);
+
+  /* Given an unreachable block, propagate that property to outgoing
+     and possibly incoming edges for the block.  Typically called after
+     determining a block is unreachable in the before_dom_children
+     callback.  */
+  void propagate_unreachable_to_edges (basic_block, FILE *, dump_flags_t);
+
+};
+
+extern void set_all_edges_as_executable (function *fn);
+
+#endif