--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/ci/bcEscapeAnalyzer.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2005, 2013, 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_VM_CI_BCESCAPEANALYZER_HPP
+#define SHARE_VM_CI_BCESCAPEANALYZER_HPP
+
+#ifdef COMPILER2
+#include "ci/ciObject.hpp"
+#include "ci/ciMethod.hpp"
+#include "ci/ciMethodData.hpp"
+#include "code/dependencies.hpp"
+#include "libadt/vectset.hpp"
+#include "memory/allocation.hpp"
+#include "utilities/growableArray.hpp"
+#endif
+
+// This class implements a fast, conservative analysis of effect of methods
+// on the escape state of their arguments.  The analysis is at the bytecode
+// level.
+
+class  ciMethodBlocks;
+class  ciBlock;
+
+class BCEscapeAnalyzer : public ResourceObj {
+ private:
+  Arena*            _arena;        // ciEnv arena
+
+  bool              _conservative; // If true, return maximally
+                                   // conservative results.
+  ciMethod*         _method;
+  ciMethodData*     _methodData;
+  int               _arg_size;
+  VectorSet         _arg_local;
+  VectorSet         _arg_stack;
+  VectorSet         _arg_returned;
+  VectorSet         _dirty;
+  enum{ ARG_OFFSET_MAX = 31};
+  uint              *_arg_modified;
+
+  bool              _return_local;
+  bool              _return_allocated;
+  bool              _allocated_escapes;
+  bool              _unknown_modified;
+
+  GrowableArray<ciMetadata *> _dependencies;
+
+  ciMethodBlocks   *_methodBlocks;
+
+  BCEscapeAnalyzer* _parent;
+  int               _level;
+
+ public:
+  class  ArgumentMap;
+  class  StateInfo;
+
+ private:
+  // helper functions
+  bool is_argument(int i)    { return i >= 0 && i < _arg_size; }
+  void set_returned(ArgumentMap vars);
+  bool is_argument(ArgumentMap vars);
+  bool is_arg_stack(ArgumentMap vars);
+  bool returns_all(ArgumentMap vars);
+  void clear_bits(ArgumentMap vars, VectorSet &bs);
+  void set_method_escape(ArgumentMap vars);
+  void set_global_escape(ArgumentMap vars, bool merge = false);
+  void set_dirty(ArgumentMap vars);
+  void set_modified(ArgumentMap vars, int offs, int size);
+
+  bool is_recursive_call(ciMethod* callee);
+  void add_dependence(ciKlass *klass, ciMethod *meth);
+  void propagate_dependencies(ciMethod *meth);
+  void invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder);
+
+  void iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors);
+  void iterate_blocks(Arena *);
+  void merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state);
+
+  // analysis
+  void initialize();
+  void clear_escape_info();
+  void compute_escape_info();
+  vmIntrinsics::ID known_intrinsic();
+  bool compute_escape_for_intrinsic(vmIntrinsics::ID iid);
+  bool do_analysis();
+
+  void read_escape_info();
+
+  bool contains(uint arg_set1, uint arg_set2);
+
+ public:
+  BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL);
+
+  // accessors
+  ciMethod*         method() const               { return _method; }
+  ciMethodData*     methodData() const           { return _methodData; }
+  BCEscapeAnalyzer* parent() const               { return _parent; }
+  int               level() const                { return _level; }
+  GrowableArray<ciMetadata *>* dependencies()    { return &_dependencies; }
+  bool              has_dependencies() const     { return !_dependencies.is_empty(); }
+
+  // retrieval of interprocedural escape information
+
+  // The given argument does not escape the callee.
+  bool is_arg_local(int i) const {
+    return !_conservative && _arg_local.test(i);
+  }
+
+  // The given argument escapes the callee, but does not become globally
+  // reachable.
+  bool is_arg_stack(int i) const {
+    return !_conservative && _arg_stack.test(i);
+  }
+
+  // The given argument does not escape globally, and may be returned.
+  bool is_arg_returned(int i) const {
+    return !_conservative && _arg_returned.test(i); }
+
+  // True iff only input arguments are returned.
+  bool is_return_local() const {
+    return !_conservative && _return_local;
+  }
+
+  // True iff only newly allocated unescaped objects are returned.
+  bool is_return_allocated() const {
+    return !_conservative && _return_allocated && !_allocated_escapes;
+  }
+
+  // Tracking of argument modification
+
+  enum {OFFSET_ANY = -1};
+  bool is_arg_modified(int arg, int offset, int size_in_bytes);
+  void set_arg_modified(int arg, int offset, int size_in_bytes);
+  bool has_non_arg_side_affects()    { return _unknown_modified; }
+
+  // Copy dependencies from this analysis into "deps"
+  void copy_dependencies(Dependencies *deps);
+
+#ifndef PRODUCT
+  // dump escape information
+  void dump();
+#endif
+};
+
+#endif // SHARE_VM_CI_BCESCAPEANALYZER_HPP