Mercurial > hg > truffle
annotate src/share/vm/code/location.hpp @ 10408:836a62f43af9
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 19 Jun 2013 10:45:56 +0200 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CODE_LOCATION_HPP |
| 26 #define SHARE_VM_CODE_LOCATION_HPP | |
| 27 | |
| 28 #include "asm/assembler.hpp" | |
| 29 #include "code/vmreg.hpp" | |
| 30 #include "memory/allocation.hpp" | |
| 31 | |
| 0 | 32 // A Location describes a concrete machine variable location |
| 33 // (such as integer or floating point register or a stack-held | |
| 34 // variable). Used when generating debug-information for nmethods. | |
| 35 // | |
| 36 // Encoding: | |
| 37 // | |
| 331 | 38 // bits (use low bits for best compression): |
| 39 // Type: [3..0] | |
| 40 // Where: [4] | |
| 41 // Offset: [31..5] | |
| 0 | 42 |
| 43 class Location VALUE_OBJ_CLASS_SPEC { | |
| 44 friend class VMStructs; | |
| 45 public: | |
| 46 enum Where { | |
| 47 on_stack, | |
| 48 in_register | |
| 49 }; | |
| 50 | |
| 51 enum Type { | |
| 331 | 52 invalid, // Invalid location |
| 0 | 53 normal, // Ints, floats, double halves |
| 54 oop, // Oop (please GC me!) | |
| 55 int_in_long, // Integer held in long register | |
| 56 lng, // Long held in one register | |
| 57 float_in_dbl, // Float held in double register | |
| 58 dbl, // Double held in one register | |
| 59 addr, // JSR return address | |
| 331 | 60 narrowoop // Narrow Oop (please GC me!) |
| 0 | 61 }; |
| 62 | |
| 63 | |
| 64 private: | |
| 65 enum { | |
| 331 | 66 TYPE_MASK = (juint) 0x0F, |
| 67 TYPE_SHIFT = 0, | |
| 68 WHERE_MASK = (juint) 0x10, | |
| 69 WHERE_SHIFT = 4, | |
| 70 OFFSET_MASK = (juint) 0xFFFFFFE0, | |
| 71 OFFSET_SHIFT = 5 | |
| 0 | 72 }; |
| 73 | |
| 331 | 74 juint _value; |
| 0 | 75 |
| 76 // Create a bit-packed Location | |
| 77 Location(Where where_, Type type_, unsigned offset_) { | |
| 78 set(where_, type_, offset_); | |
| 79 assert( where () == where_ , "" ); | |
| 80 assert( type () == type_ , "" ); | |
| 81 assert( offset() == offset_, "" ); | |
| 82 } | |
| 83 | |
| 84 inline void set(Where where_, Type type_, unsigned offset_) { | |
| 331 | 85 _value = (juint) ((where_ << WHERE_SHIFT) | |
| 86 (type_ << TYPE_SHIFT) | | |
| 87 ((offset_ << OFFSET_SHIFT) & OFFSET_MASK)); | |
| 0 | 88 } |
| 89 | |
| 90 public: | |
| 91 | |
| 92 // Stack location Factory. Offset is 4-byte aligned; remove low bits | |
| 93 static Location new_stk_loc( Type t, int offset ) { return Location(on_stack,t,offset>>LogBytesPerInt); } | |
| 94 // Register location Factory | |
| 95 static Location new_reg_loc( Type t, VMReg reg ) { return Location(in_register, t, reg->value()); } | |
| 96 // Default constructor | |
| 331 | 97 Location() { set(on_stack,invalid,0); } |
| 0 | 98 |
| 99 // Bit field accessors | |
| 100 Where where() const { return (Where) ((_value & WHERE_MASK) >> WHERE_SHIFT);} | |
| 101 Type type() const { return (Type) ((_value & TYPE_MASK) >> TYPE_SHIFT); } | |
| 102 unsigned offset() const { return (unsigned) ((_value & OFFSET_MASK) >> OFFSET_SHIFT); } | |
| 103 | |
| 104 // Accessors | |
| 105 bool is_register() const { return where() == in_register; } | |
| 106 bool is_stack() const { return where() == on_stack; } | |
| 107 | |
| 108 int stack_offset() const { assert(where() == on_stack, "wrong Where"); return offset()<<LogBytesPerInt; } | |
| 109 int register_number() const { assert(where() == in_register, "wrong Where"); return offset() ; } | |
| 110 | |
| 111 VMReg reg() const { assert(where() == in_register, "wrong Where"); return VMRegImpl::as_VMReg(offset()) ; } | |
| 112 | |
| 113 // Printing | |
| 114 void print_on(outputStream* st) const; | |
| 115 | |
| 116 // Serialization of debugging information | |
| 117 Location(DebugInfoReadStream* stream); | |
| 118 void write_on(DebugInfoWriteStream* stream); | |
| 119 | |
| 120 // check | |
| 121 static bool legal_offset_in_bytes(int offset_in_bytes); | |
| 122 }; | |
| 1972 | 123 |
| 124 #endif // SHARE_VM_CODE_LOCATION_HPP |