Mercurial > hg > graal-jvmci-8
comparison src/share/vm/code/vmreg.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c5cbd367e4d1 |
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1 /* | |
2 * Copyright 1998-2007 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 //------------------------------VMReg------------------------------------------ | |
26 // The VM uses 'unwarped' stack slots; the compiler uses 'warped' stack slots. | |
27 // Register numbers below VMRegImpl::stack0 are the same for both. Register | |
28 // numbers above stack0 are either warped (in the compiler) or unwarped | |
29 // (in the VM). Unwarped numbers represent stack indices, offsets from | |
30 // the current stack pointer. Warped numbers are required during compilation | |
31 // when we do not yet know how big the frame will be. | |
32 | |
33 class VMRegImpl; | |
34 typedef VMRegImpl* VMReg; | |
35 | |
36 class VMRegImpl { | |
37 // friend class OopMap; | |
38 friend class VMStructs; | |
39 friend class OptoReg; | |
40 // friend class Location; | |
41 private: | |
42 enum { | |
43 BAD = -1 | |
44 }; | |
45 | |
46 | |
47 | |
48 static VMReg stack0; | |
49 // Names for registers | |
50 static const char *regName[]; | |
51 static const int register_count; | |
52 | |
53 | |
54 public: | |
55 | |
56 static VMReg as_VMReg(int val, bool bad_ok = false) { assert(val > BAD || bad_ok, "invalid"); return (VMReg) (intptr_t) val; } | |
57 | |
58 const char* name() { | |
59 if (is_reg()) { | |
60 return regName[value()]; | |
61 } else if (!is_valid()) { | |
62 return "BAD"; | |
63 } else { | |
64 // shouldn't really be called with stack | |
65 return "STACKED REG"; | |
66 } | |
67 } | |
68 static VMReg Bad() { return (VMReg) (intptr_t) BAD; } | |
69 bool is_valid() { return ((intptr_t) this) != BAD; } | |
70 bool is_stack() { return (intptr_t) this >= (intptr_t) stack0; } | |
71 bool is_reg() { return is_valid() && !is_stack(); } | |
72 | |
73 // A concrete register is a value that returns true for is_reg() and is | |
74 // also a register you could use in the assembler. On machines with | |
75 // 64bit registers only one half of the VMReg (and OptoReg) is considered | |
76 // concrete. | |
77 bool is_concrete(); | |
78 | |
79 // VMRegs are 4 bytes wide on all platforms | |
80 static const int stack_slot_size; | |
81 static const int slots_per_word; | |
82 | |
83 | |
84 // This really ought to check that the register is "real" in the sense that | |
85 // we don't try and get the VMReg number of a physical register that doesn't | |
86 // have an expressible part. That would be pd specific code | |
87 VMReg next() { | |
88 assert((is_reg() && value() < stack0->value() - 1) || is_stack(), "must be"); | |
89 return (VMReg)(intptr_t)(value() + 1); | |
90 } | |
91 VMReg prev() { | |
92 assert((is_stack() && value() > stack0->value()) || (is_reg() && value() != 0), "must be"); | |
93 return (VMReg)(intptr_t)(value() - 1); | |
94 } | |
95 | |
96 | |
97 intptr_t value() const {return (intptr_t) this; } | |
98 | |
99 void print(); | |
100 | |
101 // bias a stack slot. | |
102 // Typically used to adjust a virtual frame slots by amounts that are offset by | |
103 // amounts that are part of the native abi. The VMReg must be a stack slot | |
104 // and the result must be also. | |
105 | |
106 VMReg bias(int offset) { | |
107 assert(is_stack(), "must be"); | |
108 // VMReg res = VMRegImpl::as_VMReg(value() + offset); | |
109 VMReg res = stack2reg(reg2stack() + offset); | |
110 assert(res->is_stack(), "must be"); | |
111 return res; | |
112 } | |
113 | |
114 // Convert register numbers to stack slots and vice versa | |
115 static VMReg stack2reg( int idx ) { | |
116 return (VMReg) (intptr_t) (stack0->value() + idx); | |
117 } | |
118 | |
119 uintptr_t reg2stack() { | |
120 assert( is_stack(), "Not a stack-based register" ); | |
121 return value() - stack0->value(); | |
122 } | |
123 | |
124 static void set_regName(); | |
125 | |
126 #include "incls/_vmreg_pd.hpp.incl" | |
127 | |
128 }; | |
129 | |
130 //---------------------------VMRegPair------------------------------------------- | |
131 // Pairs of 32-bit registers for arguments. | |
132 // SharedRuntime::java_calling_convention will overwrite the structs with | |
133 // the calling convention's registers. VMRegImpl::Bad is returned for any | |
134 // unused 32-bit register. This happens for the unused high half of Int | |
135 // arguments, or for 32-bit pointers or for longs in the 32-bit sparc build | |
136 // (which are passed to natives in low 32-bits of e.g. O0/O1 and the high | |
137 // 32-bits of O0/O1 are set to VMRegImpl::Bad). Longs in one register & doubles | |
138 // always return a high and a low register, as do 64-bit pointers. | |
139 // | |
140 class VMRegPair { | |
141 private: | |
142 VMReg _second; | |
143 VMReg _first; | |
144 public: | |
145 void set_bad ( ) { _second=VMRegImpl::Bad(); _first=VMRegImpl::Bad(); } | |
146 void set1 ( VMReg v ) { _second=VMRegImpl::Bad(); _first=v; } | |
147 void set2 ( VMReg v ) { _second=v->next(); _first=v; } | |
148 void set_pair( VMReg second, VMReg first ) { _second= second; _first= first; } | |
149 void set_ptr ( VMReg ptr ) { | |
150 #ifdef _LP64 | |
151 _second = ptr->next(); | |
152 #else | |
153 _second = VMRegImpl::Bad(); | |
154 #endif | |
155 _first = ptr; | |
156 } | |
157 // Return true if single register, even if the pair is really just adjacent stack slots | |
158 bool is_single_reg() { | |
159 return (_first->is_valid()) && (_first->value() + 1 == _second->value()); | |
160 } | |
161 | |
162 // Return true if single stack based "register" where the slot alignment matches input alignment | |
163 bool is_adjacent_on_stack(int alignment) { | |
164 return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0)); | |
165 } | |
166 | |
167 // Return true if single stack based "register" where the slot alignment matches input alignment | |
168 bool is_adjacent_aligned_on_stack(int alignment) { | |
169 return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0)); | |
170 } | |
171 | |
172 // Return true if single register but adjacent stack slots do not count | |
173 bool is_single_phys_reg() { | |
174 return (_first->is_reg() && (_first->value() + 1 == _second->value())); | |
175 } | |
176 | |
177 VMReg second() const { return _second; } | |
178 VMReg first() const { return _first; } | |
179 VMRegPair(VMReg s, VMReg f) { _second = s; _first = f; } | |
180 VMRegPair(VMReg f) { _second = VMRegImpl::Bad(); _first = f; } | |
181 VMRegPair() { _second = VMRegImpl::Bad(); _first = VMRegImpl::Bad(); } | |
182 }; |