230 lines
8.5 KiB
C
230 lines
8.5 KiB
C
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/* Header file for gimple range GORI structures.
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Copyright (C) 2017-2023 Free Software Foundation, Inc.
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Contributed by Andrew MacLeod <amacleod@redhat.com>
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and Aldy Hernandez <aldyh@redhat.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_GIMPLE_RANGE_GORI_H
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#define GCC_GIMPLE_RANGE_GORI_H
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// RANGE_DEF_CHAIN is used to determine which SSA names in a block can
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// have range information calculated for them, and what the
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// dependencies on each other are.
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class range_def_chain
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{
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public:
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range_def_chain ();
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~range_def_chain ();
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tree depend1 (tree name) const;
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tree depend2 (tree name) const;
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bool in_chain_p (tree name, tree def);
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bool chain_import_p (tree name, tree import);
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void register_dependency (tree name, tree ssa1, basic_block bb = NULL);
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void dump (FILE *f, basic_block bb, const char *prefix = NULL);
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protected:
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bool has_def_chain (tree name);
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bool def_chain_in_bitmap_p (tree name, bitmap b);
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void add_def_chain_to_bitmap (bitmap b, tree name);
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bitmap get_def_chain (tree name);
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bitmap get_imports (tree name);
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bitmap_obstack m_bitmaps;
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private:
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struct rdc {
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tree ssa1; // First direct dependency
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tree ssa2; // Second direct dependency
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bitmap bm; // All dependencies
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bitmap m_import;
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};
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vec<rdc> m_def_chain; // SSA_NAME : def chain components.
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void set_import (struct rdc &data, tree imp, bitmap b);
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int m_logical_depth;
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};
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// Return the first direct dependency for NAME, if there is one.
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// Direct dependencies are those which occur on the definition statement.
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// Only the first 2 such names are cached.
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inline tree
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range_def_chain::depend1 (tree name) const
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{
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unsigned v = SSA_NAME_VERSION (name);
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if (v >= m_def_chain.length ())
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return NULL_TREE;
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return m_def_chain[v].ssa1;
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}
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// Return the second direct dependency for NAME, if there is one.
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inline tree
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range_def_chain::depend2 (tree name) const
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{
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unsigned v = SSA_NAME_VERSION (name);
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if (v >= m_def_chain.length ())
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return NULL_TREE;
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return m_def_chain[v].ssa2;
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}
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// GORI_MAP is used to accumulate what SSA names in a block can
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// generate range information, and provides tools for the block ranger
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// to enable it to efficiently calculate these ranges.
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class gori_map : public range_def_chain
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{
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public:
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gori_map ();
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~gori_map ();
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bool is_export_p (tree name, basic_block bb = NULL);
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bool is_import_p (tree name, basic_block bb);
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bitmap exports (basic_block bb);
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bitmap imports (basic_block bb);
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void set_range_invariant (tree name, bool invariant = true);
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void dump (FILE *f);
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void dump (FILE *f, basic_block bb, bool verbose = true);
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private:
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vec<bitmap> m_outgoing; // BB: Outgoing ranges calculable on edges
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vec<bitmap> m_incoming; // BB: Incoming ranges which can affect exports.
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bitmap m_maybe_variant; // Names which might have outgoing ranges.
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void maybe_add_gori (tree name, basic_block bb);
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void calculate_gori (basic_block bb);
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};
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// This class is used to determine which SSA_NAMES can have ranges
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// calculated for them on outgoing edges from basic blocks. This represents
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// ONLY the effect of the basic block edge->src on a range.
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//
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// There are 2 primary entry points:
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//
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// has_edge_range_p (tree name, edge e)
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// returns true if the outgoing edge *may* be able to produce range
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// information for ssa_name NAME on edge E.
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// FALSE is returned if this edge does not affect the range of NAME.
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// if no edge is specified, return TRUE if name may have a value calculated
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// on *ANY* edge that has been seen. FALSE indicates that the global value
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// is applicable everywhere that has been processed.
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//
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// outgoing_edge_range_p (vrange &range, edge e, tree name)
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// Actually does the calculation of RANGE for name on E
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// This represents application of whatever static range effect edge E
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// may have on NAME, not any cumulative effect.
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// There are also some internal APIs
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//
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// ssa_range_in_bb () is an internal routine which is used to start any
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// calculation chain using SSA_NAMES which come from outside the block. ie
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// a_2 = b_4 - 8
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// if (a_2 < 30)
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// on the true edge, a_2 is known to be [0, 29]
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// b_4 can be calculated as [8, 37]
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// during this calculation, b_4 is considered an "import" and ssa_range_in_bb
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// is queried for a starting range which is used in the calculation.
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// A default value of VARYING provides the raw static info for the edge.
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//
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// If there is any known range for b_4 coming into this block, it can refine
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// the results. This allows for cascading results to be propagated.
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// if b_4 is [100, 200] on entry to the block, feeds into the calculation
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// of a_2 = [92, 192], and finally on the true edge the range would be
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// an empty range [] because it is not possible for the true edge to be taken.
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//
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// expr_range_in_bb is simply a wrapper which calls ssa_range_in_bb for
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// SSA_NAMES and otherwise simply calculates the range of the expression.
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//
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// The constructor takes a flag value to use on edges to check for the
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// NON_EXECUTABLE_EDGE property. The zero default means no flag is checked.
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// All value requests from NON_EXECUTABLE_EDGE edges are returned UNDEFINED.
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//
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// The remaining routines are internal use only.
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class value_relation;
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class gori_compute : public gori_map
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{
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public:
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gori_compute (int not_executable_flag = 0);
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bool outgoing_edge_range_p (vrange &r, edge e, tree name, range_query &q);
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bool condexpr_adjust (vrange &r1, vrange &r2, gimple *s, tree cond, tree op1,
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tree op2, fur_source &src);
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bool has_edge_range_p (tree name, basic_block bb = NULL);
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bool has_edge_range_p (tree name, edge e);
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void dump (FILE *f);
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bool compute_operand_range (vrange &r, gimple *stmt, const vrange &lhs,
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tree name, class fur_source &src,
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value_relation *rel = NULL);
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private:
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bool refine_using_relation (tree op1, vrange &op1_range,
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tree op2, vrange &op2_range,
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fur_source &src, relation_kind k);
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bool may_recompute_p (tree name, edge e, int depth = -1);
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bool may_recompute_p (tree name, basic_block bb = NULL, int depth = -1);
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bool compute_operand_range_switch (vrange &r, gswitch *s, const vrange &lhs,
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tree name, fur_source &src);
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bool compute_operand1_range (vrange &r, gimple_range_op_handler &handler,
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const vrange &lhs, tree name, fur_source &src,
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value_relation *rel = NULL);
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bool compute_operand2_range (vrange &r, gimple_range_op_handler &handler,
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const vrange &lhs, tree name, fur_source &src,
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value_relation *rel = NULL);
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bool compute_operand1_and_operand2_range (vrange &r,
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gimple_range_op_handler &handler,
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const vrange &lhs, tree name,
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fur_source &src,
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value_relation *rel = NULL);
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void compute_logical_operands (vrange &true_range, vrange &false_range,
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gimple_range_op_handler &handler,
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const irange &lhs, tree name, fur_source &src,
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tree op, bool op_in_chain);
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bool logical_combine (vrange &r, enum tree_code code, const irange &lhs,
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const vrange &op1_true, const vrange &op1_false,
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const vrange &op2_true, const vrange &op2_false);
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int_range<2> m_bool_zero; // Boolean false cached.
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int_range<2> m_bool_one; // Boolean true cached.
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gimple_outgoing_range outgoing; // Edge values for COND_EXPR & SWITCH_EXPR.
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range_tracer tracer;
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int m_not_executable_flag;
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};
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// For each name that is an import into BB's exports..
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#define FOR_EACH_GORI_IMPORT_NAME(gori, bb, name) \
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for (gori_export_iterator iter ((gori).imports ((bb))); \
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((name) = iter.get_name ()); \
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iter.next ())
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// For each name possibly exported from block BB.
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#define FOR_EACH_GORI_EXPORT_NAME(gori, bb, name) \
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for (gori_export_iterator iter ((gori).exports ((bb))); \
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((name) = iter.get_name ()); \
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iter.next ())
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// Used to assist with iterating over the GORI export list in various ways
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class gori_export_iterator {
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public:
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gori_export_iterator (bitmap b);
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void next ();
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tree get_name ();
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protected:
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bitmap bm;
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bitmap_iterator bi;
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unsigned y;
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};
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#endif // GCC_GIMPLE_RANGE_GORI_H
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