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annotate src/share/vm/code/vmreg.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | d1605aabd0a1 |
| children | f95d63e2154a |
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| 0 | 1 /* |
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2 * Copyright (c) 1998, 2008, 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 | |
| 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; } | |
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69 bool is_valid() const { return ((intptr_t) this) != BAD; } |
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70 bool is_stack() const { return (intptr_t) this >= (intptr_t) stack0; } |
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71 bool is_reg() const { return is_valid() && !is_stack(); } |
| 0 | 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 | |
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99 void print_on(outputStream* st) const; |
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100 void print() const { print_on(tty); } |
| 0 | 101 |
| 102 // bias a stack slot. | |
| 103 // Typically used to adjust a virtual frame slots by amounts that are offset by | |
| 104 // amounts that are part of the native abi. The VMReg must be a stack slot | |
| 105 // and the result must be also. | |
| 106 | |
| 107 VMReg bias(int offset) { | |
| 108 assert(is_stack(), "must be"); | |
| 109 // VMReg res = VMRegImpl::as_VMReg(value() + offset); | |
| 110 VMReg res = stack2reg(reg2stack() + offset); | |
| 111 assert(res->is_stack(), "must be"); | |
| 112 return res; | |
| 113 } | |
| 114 | |
| 115 // Convert register numbers to stack slots and vice versa | |
| 116 static VMReg stack2reg( int idx ) { | |
| 117 return (VMReg) (intptr_t) (stack0->value() + idx); | |
| 118 } | |
| 119 | |
| 120 uintptr_t reg2stack() { | |
| 121 assert( is_stack(), "Not a stack-based register" ); | |
| 122 return value() - stack0->value(); | |
| 123 } | |
| 124 | |
| 125 static void set_regName(); | |
| 126 | |
| 127 #include "incls/_vmreg_pd.hpp.incl" | |
| 128 | |
| 129 }; | |
| 130 | |
| 131 //---------------------------VMRegPair------------------------------------------- | |
| 132 // Pairs of 32-bit registers for arguments. | |
| 133 // SharedRuntime::java_calling_convention will overwrite the structs with | |
| 134 // the calling convention's registers. VMRegImpl::Bad is returned for any | |
| 135 // unused 32-bit register. This happens for the unused high half of Int | |
| 136 // arguments, or for 32-bit pointers or for longs in the 32-bit sparc build | |
| 137 // (which are passed to natives in low 32-bits of e.g. O0/O1 and the high | |
| 138 // 32-bits of O0/O1 are set to VMRegImpl::Bad). Longs in one register & doubles | |
| 139 // always return a high and a low register, as do 64-bit pointers. | |
| 140 // | |
| 141 class VMRegPair { | |
| 142 private: | |
| 143 VMReg _second; | |
| 144 VMReg _first; | |
| 145 public: | |
| 146 void set_bad ( ) { _second=VMRegImpl::Bad(); _first=VMRegImpl::Bad(); } | |
| 147 void set1 ( VMReg v ) { _second=VMRegImpl::Bad(); _first=v; } | |
| 148 void set2 ( VMReg v ) { _second=v->next(); _first=v; } | |
| 149 void set_pair( VMReg second, VMReg first ) { _second= second; _first= first; } | |
| 150 void set_ptr ( VMReg ptr ) { | |
| 151 #ifdef _LP64 | |
| 152 _second = ptr->next(); | |
| 153 #else | |
| 154 _second = VMRegImpl::Bad(); | |
| 155 #endif | |
| 156 _first = ptr; | |
| 157 } | |
| 158 // Return true if single register, even if the pair is really just adjacent stack slots | |
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159 bool is_single_reg() const { |
| 0 | 160 return (_first->is_valid()) && (_first->value() + 1 == _second->value()); |
| 161 } | |
| 162 | |
| 163 // Return true if single stack based "register" where the slot alignment matches input alignment | |
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164 bool is_adjacent_on_stack(int alignment) const { |
| 0 | 165 return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0)); |
| 166 } | |
| 167 | |
| 168 // Return true if single stack based "register" where the slot alignment matches input alignment | |
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169 bool is_adjacent_aligned_on_stack(int alignment) const { |
| 0 | 170 return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0)); |
| 171 } | |
| 172 | |
| 173 // Return true if single register but adjacent stack slots do not count | |
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174 bool is_single_phys_reg() const { |
| 0 | 175 return (_first->is_reg() && (_first->value() + 1 == _second->value())); |
| 176 } | |
| 177 | |
| 178 VMReg second() const { return _second; } | |
| 179 VMReg first() const { return _first; } | |
| 180 VMRegPair(VMReg s, VMReg f) { _second = s; _first = f; } | |
| 181 VMRegPair(VMReg f) { _second = VMRegImpl::Bad(); _first = f; } | |
| 182 VMRegPair() { _second = VMRegImpl::Bad(); _first = VMRegImpl::Bad(); } | |
| 183 }; |