/* Header file for gimple statement walk support. Copyright (C) 2013-2017 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 GCC_GIMPLE_WALK_H #define GCC_GIMPLE_WALK_H /* Convenience routines to walk all statements of a gimple function. Note that this is useful exclusively before the code is converted into SSA form. Once the program is in SSA form, the standard operand interface should be used to analyze/modify statements. */ struct walk_stmt_info { /* Points to the current statement being walked. */ gimple_stmt_iterator gsi; gimple *stmt; /* Additional data that the callback functions may want to carry through the recursion. */ void *info; /* Pointer map used to mark visited tree nodes when calling walk_tree on each operand. If set to NULL, duplicate tree nodes will be visited more than once. */ hash_set<tree> *pset; /* Operand returned by the callbacks. This is set when calling walk_gimple_seq. If the walk_stmt_fn or walk_tree_fn callback returns non-NULL, this field will contain the tree returned by the last callback. */ tree callback_result; /* Indicates whether the operand being examined may be replaced with something that matches is_gimple_val (if true) or something slightly more complicated (if false). "Something" technically means the common subset of is_gimple_lvalue and is_gimple_rhs, but we never try to form anything more complicated than that, so we don't bother checking. Also note that CALLBACK should update this flag while walking the sub-expressions of a statement. For instance, when walking the statement 'foo (&var)', the flag VAL_ONLY will initially be set to true, however, when walking &var, the operand of that ADDR_EXPR does not need to be a GIMPLE value. */ BOOL_BITFIELD val_only : 1; /* True if we are currently walking the LHS of an assignment. */ BOOL_BITFIELD is_lhs : 1; /* Optional. Set to true by the callback functions if they made any changes. */ BOOL_BITFIELD changed : 1; /* True if we're interested in location information. */ BOOL_BITFIELD want_locations : 1; /* True if we've removed the statement that was processed. */ BOOL_BITFIELD removed_stmt : 1; }; /* Callback for walk_gimple_stmt. Called for every statement found during traversal. The first argument points to the statement to walk. The second argument is a flag that the callback sets to 'true' if it the callback handled all the operands and sub-statements of the statement (the default value of this flag is 'false'). The third argument is an anonymous pointer to data to be used by the callback. */ typedef tree (*walk_stmt_fn) (gimple_stmt_iterator *, bool *, struct walk_stmt_info *); extern gimple *walk_gimple_seq_mod (gimple_seq *, walk_stmt_fn, walk_tree_fn, struct walk_stmt_info *); extern gimple *walk_gimple_seq (gimple_seq, walk_stmt_fn, walk_tree_fn, struct walk_stmt_info *); extern tree walk_gimple_op (gimple *, walk_tree_fn, struct walk_stmt_info *); extern tree walk_gimple_stmt (gimple_stmt_iterator *, walk_stmt_fn, walk_tree_fn, struct walk_stmt_info *); typedef bool (*walk_stmt_load_store_addr_fn) (gimple *, tree, tree, void *); extern bool walk_stmt_load_store_addr_ops (gimple *, void *, walk_stmt_load_store_addr_fn, walk_stmt_load_store_addr_fn, walk_stmt_load_store_addr_fn); extern bool walk_stmt_load_store_ops (gimple *, void *, walk_stmt_load_store_addr_fn, walk_stmt_load_store_addr_fn); #endif /* GCC_GIMPLE_WALK_H */ |