Mercurial > hg > graal-jvmci-8
comparison src/share/vm/code/location.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | cecd8eb4e0ca |
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1 /* | |
2 * Copyright 1997-2006 Sun Microsystems, Inc. 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 | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
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). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // A Location describes a concrete machine variable location | |
26 // (such as integer or floating point register or a stack-held | |
27 // variable). Used when generating debug-information for nmethods. | |
28 // | |
29 // Encoding: | |
30 // | |
31 // bits: | |
32 // Where: [15] | |
33 // Type: [14..12] | |
34 // Offset: [11..0] | |
35 | |
36 class Location VALUE_OBJ_CLASS_SPEC { | |
37 friend class VMStructs; | |
38 public: | |
39 enum Where { | |
40 on_stack, | |
41 in_register | |
42 }; | |
43 | |
44 enum Type { | |
45 normal, // Ints, floats, double halves | |
46 oop, // Oop (please GC me!) | |
47 int_in_long, // Integer held in long register | |
48 lng, // Long held in one register | |
49 float_in_dbl, // Float held in double register | |
50 dbl, // Double held in one register | |
51 addr, // JSR return address | |
52 invalid // Invalid location | |
53 }; | |
54 | |
55 | |
56 private: | |
57 enum { | |
58 OFFSET_MASK = (jchar) 0x0FFF, | |
59 OFFSET_SHIFT = 0, | |
60 TYPE_MASK = (jchar) 0x7000, | |
61 TYPE_SHIFT = 12, | |
62 WHERE_MASK = (jchar) 0x8000, | |
63 WHERE_SHIFT = 15 | |
64 }; | |
65 | |
66 uint16_t _value; | |
67 | |
68 // Create a bit-packed Location | |
69 Location(Where where_, Type type_, unsigned offset_) { | |
70 set(where_, type_, offset_); | |
71 assert( where () == where_ , "" ); | |
72 assert( type () == type_ , "" ); | |
73 assert( offset() == offset_, "" ); | |
74 } | |
75 | |
76 inline void set(Where where_, Type type_, unsigned offset_) { | |
77 _value = (uint16_t) ((where_ << WHERE_SHIFT) | | |
78 (type_ << TYPE_SHIFT) | | |
79 ((offset_ << OFFSET_SHIFT) & OFFSET_MASK)); | |
80 } | |
81 | |
82 public: | |
83 | |
84 // Stack location Factory. Offset is 4-byte aligned; remove low bits | |
85 static Location new_stk_loc( Type t, int offset ) { return Location(on_stack,t,offset>>LogBytesPerInt); } | |
86 // Register location Factory | |
87 static Location new_reg_loc( Type t, VMReg reg ) { return Location(in_register, t, reg->value()); } | |
88 // Default constructor | |
89 Location() { set(on_stack,invalid,(unsigned) -1); } | |
90 | |
91 // Bit field accessors | |
92 Where where() const { return (Where) ((_value & WHERE_MASK) >> WHERE_SHIFT);} | |
93 Type type() const { return (Type) ((_value & TYPE_MASK) >> TYPE_SHIFT); } | |
94 unsigned offset() const { return (unsigned) ((_value & OFFSET_MASK) >> OFFSET_SHIFT); } | |
95 | |
96 // Accessors | |
97 bool is_register() const { return where() == in_register; } | |
98 bool is_stack() const { return where() == on_stack; } | |
99 | |
100 int stack_offset() const { assert(where() == on_stack, "wrong Where"); return offset()<<LogBytesPerInt; } | |
101 int register_number() const { assert(where() == in_register, "wrong Where"); return offset() ; } | |
102 | |
103 VMReg reg() const { assert(where() == in_register, "wrong Where"); return VMRegImpl::as_VMReg(offset()) ; } | |
104 | |
105 // Printing | |
106 void print_on(outputStream* st) const; | |
107 | |
108 // Serialization of debugging information | |
109 Location(DebugInfoReadStream* stream); | |
110 void write_on(DebugInfoWriteStream* stream); | |
111 | |
112 // check | |
113 static bool legal_offset_in_bytes(int offset_in_bytes); | |
114 }; |