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/*
* Copyright (c) 2009, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_OPTO_STRINGOPTS_HPP
#define SHARE_OPTO_STRINGOPTS_HPP
#include "opto/node.hpp"
#include "opto/phaseX.hpp"
class StringConcat;
class IdealVariable;
class PhaseStringOpts : public Phase {
friend class StringConcat;
private:
PhaseGVN* _gvn;
// List of dead nodes to clean up aggressively at the end
Unique_Node_List dead_worklist;
// Memory slices needed for code gen
int byte_adr_idx;
// Integer.sizeTable - used for int to String conversion
ciField* size_table_field;
// A set for use by various stages
VectorSet _visited;
// Collect a list of all SB.toString calls
Node_List collect_toString_calls();
// Examine the use of the SB alloc to see if it can be replace with
// a single string construction.
StringConcat* build_candidate(CallStaticJavaNode* call);
// Replace all the SB calls in concat with an optimization String allocation
void replace_string_concat(StringConcat* concat);
// Load the value of a static field, performing any constant folding.
Node* fetch_static_field(GraphKit& kit, ciField* field);
// Compute the number of characters required to represent the int value
Node* int_stringSize(GraphKit& kit, Node* value);
// Simplified version of Integer.getChars
void getChars(GraphKit& kit, Node* arg, Node* dst_array, BasicType bt, Node* end, Node* final_merge, Node* final_mem, int merge_index = 0);
// Copy the characters representing arg into dst_array starting at start
Node* int_getChars(GraphKit& kit, Node* arg, Node* dst_array, Node* dst_coder, Node* start, Node* size);
// Copy contents of the String str into dst_array starting at index start.
Node* copy_string(GraphKit& kit, Node* str, Node* dst_array, Node* dst_coder, Node* start);
// Copy 'count' bytes/chars from src_array to dst_array starting at index start
void arraycopy(GraphKit& kit, IdealKit& ideal, Node* src_array, Node* dst_array, BasicType elembt, Node* start, Node* count);
// Copy contents of constant src_array to dst_array by emitting individual stores
void copy_constant_string(GraphKit& kit, IdealKit& ideal, ciTypeArray* src_array, IdealVariable& count,
bool src_is_byte, Node* dst_array, Node* dst_coder, Node* start);
// Copy contents of a Latin1 encoded string from src_array to dst_array
void copy_latin1_string(GraphKit& kit, IdealKit& ideal, Node* src_array, IdealVariable& count,
Node* dst_array, Node* dst_coder, Node* start);
// Copy the char into dst_array at index start.
Node* copy_char(GraphKit& kit, Node* val, Node* dst_array, Node* dst_coder, Node* start);
// Allocate a byte array of specified length.
Node* allocate_byte_array(GraphKit& kit, IdealKit* ideal, Node* length);
// Returns the coder of a constant string
jbyte get_constant_coder(GraphKit& kit, Node* str);
// Returns the length of a constant string
int get_constant_length(GraphKit& kit, Node* str);
// Returns the value array of a constant string
ciTypeArray* get_constant_value(GraphKit& kit, Node* str);
// Clean up any leftover nodes
void record_dead_node(Node* node);
void remove_dead_nodes();
PhaseGVN* gvn() { return _gvn; }
enum {
// max length of constant string copy unrolling in copy_string
unroll_string_copy_length = 6
};
public:
PhaseStringOpts(PhaseGVN* gvn);
#ifndef PRODUCT
static void print_statistics();
private:
static uint _stropts_replaced;
static uint _stropts_merged;
static uint _stropts_total;
#endif
};
#endif // SHARE_OPTO_STRINGOPTS_HPP
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