Mercurial > hg > graal-jvmci-8

comparison src/share/vm/runtime/stackValue.cpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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