/* * Copyright (c) 1997, 2019, 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. *
*/
class IfNode; class MergeMemNode; class Node; class PhaseGVN;
//------------------------------Phase------------------------------------------ // Most optimizations are done in Phases. Creating a phase does any long // running analysis required, and caches the analysis in internal data // structures. Later the analysis is queried using transform() calls to // guide transforming the program. When the Phase is deleted, so is any // cached analysis info. This basic Phase class mostly contains timing and // memory management code. class Phase : public StackObj { public: enum PhaseNumber {
Compiler, // Top-level compiler phase
Parser, // Parse bytecodes
Remove_Useless, // Remove useless nodes
Remove_Useless_And_Renumber_Live, // First, remove useless nodes from the graph. Then, renumber live nodes.
Optimistic, // Optimistic analysis phase
GVN, // Pessimistic global value numbering phase
Ins_Select, // Instruction selection phase
CFG, // Build a CFG
BlockLayout, // Linear ordering of blocks
Register_Allocation, // Register allocation, duh
LIVE, // Dragon-book LIVE range problem
StringOpts, // StringBuilder related optimizations
Interference_Graph, // Building the IFG
Coalesce, // Coalescing copies
Ideal_Loop, // Find idealized trip-counted loops
Macro_Expand, // Expand macro nodes
Peephole, // Apply peephole optimizations
Vector,
Output,
last_phase
};
// Generate a subtyping check. Takes as input the subtype and supertype. // Returns 2 values: sets the default control() to the true path and // returns the false path. Only reads from constant memory taken from the // default memory; does not write anything. It also doesn't take in an // Object; if you wish to check an Object you need to load the Object's // class prior to coming here. // Used in GraphKit and PhaseMacroExpand static Node* gen_subtype_check(Node* subklass, Node* superklass, Node** ctrl, Node* mem, PhaseGVN& gvn);
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