Wed, 13 Apr 2011 14:33:03 -0700
6988308: assert((cnt > 0.0f) && (prob > 0.0f)) failed: Bad frequency assignment in if
Summary: Make sure cnt doesn't become negative and integer overflow doesn't happen.
Reviewed-by: kvn, twisti
1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
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15 * You should have received a copy of the GNU General Public License version
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_OPTO_MULTNODE_HPP
26 #define SHARE_VM_OPTO_MULTNODE_HPP
28 #include "opto/node.hpp"
30 class Matcher;
31 class ProjNode;
33 //------------------------------MultiNode--------------------------------------
34 // This class defines a MultiNode, a Node which produces many values. The
35 // values are wrapped up in a tuple Type, i.e. a TypeTuple.
36 class MultiNode : public Node {
37 public:
38 MultiNode( uint required ) : Node(required) {
39 init_class_id(Class_Multi);
40 }
41 virtual int Opcode() const;
42 virtual const Type *bottom_type() const = 0;
43 virtual bool is_CFG() const { return true; }
44 virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash
45 virtual bool depends_only_on_test() const { return false; }
46 virtual const RegMask &out_RegMask() const;
47 virtual Node *match( const ProjNode *proj, const Matcher *m );
48 virtual uint ideal_reg() const { return NotAMachineReg; }
49 ProjNode* proj_out(uint which_proj) const; // Get a named projection
51 };
53 //------------------------------ProjNode---------------------------------------
54 // This class defines a Projection node. Projections project a single element
55 // out of a tuple (or Signature) type. Only MultiNodes produce TypeTuple
56 // results.
57 class ProjNode : public Node {
58 protected:
59 virtual uint hash() const;
60 virtual uint cmp( const Node &n ) const;
61 virtual uint size_of() const;
62 void check_con() const; // Called from constructor.
64 public:
65 ProjNode( Node *src, uint con, bool io_use = false )
66 : Node( src ), _con(con), _is_io_use(io_use)
67 {
68 init_class_id(Class_Proj);
69 // Optimistic setting. Need additional checks in Node::is_dead_loop_safe().
70 if (con != TypeFunc::Memory || src->is_Start())
71 init_flags(Flag_is_dead_loop_safe);
72 debug_only(check_con());
73 }
74 const uint _con; // The field in the tuple we are projecting
75 const bool _is_io_use; // Used to distinguish between the projections
76 // used on the control and io paths from a macro node
77 virtual int Opcode() const;
78 virtual bool is_CFG() const;
79 virtual bool depends_only_on_test() const { return false; }
80 virtual const Type *bottom_type() const;
81 virtual const TypePtr *adr_type() const;
82 virtual bool pinned() const;
83 virtual const Type *Value( PhaseTransform *phase ) const;
84 virtual uint ideal_reg() const;
85 virtual const RegMask &out_RegMask() const;
86 #ifndef PRODUCT
87 virtual void dump_spec(outputStream *st) const;
88 #endif
89 };
91 #endif // SHARE_VM_OPTO_MULTNODE_HPP