Mercurial > hg > graal-compiler
comparison src/share/vm/runtime/stackValue.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | cecd8eb4e0ca |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:a61af66fc99e |
---|---|
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 # include "incls/_precompiled.incl" | |
26 # include "incls/_stackValue.cpp.incl" | |
27 | |
28 StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv) { | |
29 if (sv->is_location()) { | |
30 // Stack or register value | |
31 Location loc = ((LocationValue *)sv)->location(); | |
32 | |
33 #ifdef SPARC | |
34 // %%%%% Callee-save floats will NOT be working on a Sparc until we | |
35 // handle the case of a 2 floats in a single double register. | |
36 assert( !(loc.is_register() && loc.type() == Location::float_in_dbl), "Sparc does not handle callee-save floats yet" ); | |
37 #endif // SPARC | |
38 | |
39 // First find address of value | |
40 | |
41 address value_addr = loc.is_register() | |
42 // Value was in a callee-save register | |
43 ? reg_map->location(VMRegImpl::as_VMReg(loc.register_number())) | |
44 // Else value was directly saved on the stack. The frame's original stack pointer, | |
45 // before any extension by its callee (due to Compiler1 linkage on SPARC), must be used. | |
46 : ((address)fr->unextended_sp()) + loc.stack_offset(); | |
47 | |
48 // Then package it right depending on type | |
49 // Note: the transfer of the data is thru a union that contains | |
50 // an intptr_t. This is because an interpreter stack slot is | |
51 // really an intptr_t. The use of a union containing an intptr_t | |
52 // ensures that on a 64 bit platform we have proper alignment | |
53 // and that we store the value where the interpreter will expect | |
54 // to find it (i.e. proper endian). Similarly on a 32bit platform | |
55 // using the intptr_t ensures that when a value is larger than | |
56 // a stack slot (jlong/jdouble) that we capture the proper part | |
57 // of the value for the stack slot in question. | |
58 // | |
59 switch( loc.type() ) { | |
60 case Location::float_in_dbl: { // Holds a float in a double register? | |
61 // The callee has no clue whether the register holds a float, | |
62 // double or is unused. He always saves a double. Here we know | |
63 // a double was saved, but we only want a float back. Narrow the | |
64 // saved double to the float that the JVM wants. | |
65 assert( loc.is_register(), "floats always saved to stack in 1 word" ); | |
66 union { intptr_t p; jfloat jf; } value; | |
67 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); | |
68 value.jf = (jfloat) *(jdouble*) value_addr; | |
69 return new StackValue(value.p); // 64-bit high half is stack junk | |
70 } | |
71 case Location::int_in_long: { // Holds an int in a long register? | |
72 // The callee has no clue whether the register holds an int, | |
73 // long or is unused. He always saves a long. Here we know | |
74 // a long was saved, but we only want an int back. Narrow the | |
75 // saved long to the int that the JVM wants. | |
76 assert( loc.is_register(), "ints always saved to stack in 1 word" ); | |
77 union { intptr_t p; jint ji;} value; | |
78 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); | |
79 value.ji = (jint) *(jlong*) value_addr; | |
80 return new StackValue(value.p); // 64-bit high half is stack junk | |
81 } | |
82 #ifdef _LP64 | |
83 case Location::dbl: | |
84 // Double value in an aligned adjacent pair | |
85 return new StackValue(*(intptr_t*)value_addr); | |
86 case Location::lng: | |
87 // Long value in an aligned adjacent pair | |
88 return new StackValue(*(intptr_t*)value_addr); | |
89 #endif | |
90 case Location::oop: { | |
91 Handle h(*(oop *)value_addr); // Wrap a handle around the oop | |
92 return new StackValue(h); | |
93 } | |
94 case Location::addr: { | |
95 ShouldNotReachHere(); // both C1 and C2 now inline jsrs | |
96 } | |
97 case Location::normal: { | |
98 // Just copy all other bits straight through | |
99 union { intptr_t p; jint ji;} value; | |
100 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); | |
101 value.ji = *(jint*)value_addr; | |
102 return new StackValue(value.p); | |
103 } | |
104 case Location::invalid: | |
105 return new StackValue(); | |
106 default: | |
107 ShouldNotReachHere(); | |
108 } | |
109 | |
110 } else if (sv->is_constant_int()) { | |
111 // Constant int: treat same as register int. | |
112 union { intptr_t p; jint ji;} value; | |
113 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); | |
114 value.ji = (jint)((ConstantIntValue*)sv)->value(); | |
115 return new StackValue(value.p); | |
116 } else if (sv->is_constant_oop()) { | |
117 // constant oop | |
118 return new StackValue(((ConstantOopReadValue *)sv)->value()); | |
119 #ifdef _LP64 | |
120 } else if (sv->is_constant_double()) { | |
121 // Constant double in a single stack slot | |
122 union { intptr_t p; double d; } value; | |
123 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); | |
124 value.d = ((ConstantDoubleValue *)sv)->value(); | |
125 return new StackValue(value.p); | |
126 } else if (sv->is_constant_long()) { | |
127 // Constant long in a single stack slot | |
128 union { intptr_t p; jlong jl; } value; | |
129 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); | |
130 value.jl = ((ConstantLongValue *)sv)->value(); | |
131 return new StackValue(value.p); | |
132 #endif | |
133 } else if (sv->is_object()) { | |
134 return new StackValue(((ObjectValue *)sv)->value()); | |
135 } | |
136 | |
137 // Unknown ScopeValue type | |
138 ShouldNotReachHere(); | |
139 return new StackValue((intptr_t) 0); // dummy | |
140 } | |
141 | |
142 | |
143 BasicLock* StackValue::resolve_monitor_lock(const frame* fr, Location location) { | |
144 assert(location.is_stack(), "for now we only look at the stack"); | |
145 int word_offset = location.stack_offset() / wordSize; | |
146 // (stack picture) | |
147 // high: [ ] word_offset + 1 | |
148 // low [ ] word_offset | |
149 // | |
150 // sp-> [ ] 0 | |
151 // the word_offset is the distance from the stack pointer to the lowest address | |
152 // The frame's original stack pointer, before any extension by its callee | |
153 // (due to Compiler1 linkage on SPARC), must be used. | |
154 return (BasicLock*) (fr->unextended_sp() + word_offset); | |
155 } | |
156 | |
157 | |
158 #ifndef PRODUCT | |
159 | |
160 void StackValue::print_on(outputStream* st) const { | |
161 switch(_type) { | |
162 case T_INT: | |
163 st->print("%d (int) %f (float) %x (hex)", *(int *)&_i, *(float *)&_i, *(int *)&_i); | |
164 break; | |
165 | |
166 case T_OBJECT: | |
167 _o()->print_value_on(st); | |
168 st->print(" <" INTPTR_FORMAT ">", (address)_o()); | |
169 break; | |
170 | |
171 case T_CONFLICT: | |
172 st->print("conflict"); | |
173 break; | |
174 | |
175 default: | |
176 ShouldNotReachHere(); | |
177 } | |
178 } | |
179 | |
180 #endif |