1 /*
 2  * Copyright (c) 2008, 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  *
23  */
24 
25 #include "precompiled.hpp"
26 #include "asm/assembler.hpp"
27 #include "asm/assembler.inline.hpp"
28 #include "ci/ciEnv.hpp"
29 #include "gc/shared/cardTableModRefBS.hpp"
30 #include "gc/shared/collectedHeap.inline.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/interpreterRuntime.hpp"
33 #include "interpreter/templateInterpreterGenerator.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "prims/jvm_misc.hpp"
36 #include "prims/methodHandles.hpp"
37 #include "runtime/biasedLocking.hpp"
38 #include "runtime/interfaceSupport.hpp"
39 #include "runtime/objectMonitor.hpp"
40 #include "runtime/os.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/stubRoutines.hpp"
43 #include "utilities/hashtable.hpp"
44 #include "utilities/macros.hpp"
45 #if INCLUDE_ALL_GCS
46 #include "gc/g1/g1BarrierSet.hpp"
47 #include "gc/g1/g1CollectedHeap.inline.hpp"
48 #include "gc/g1/heapRegion.hpp"
49 #endif // INCLUDE_ALL_GCS
50 
51 #ifdef COMPILER2
52 // Convert the raw encoding form into the form expected by the
53 // constructor for Address.
54 Address Address::make_raw(int base, int index, int scale, int disp, relocInfo::relocType disp_reloc) {
55   RelocationHolder rspec;
56   if (disp_reloc != relocInfo::none) {
57     rspec = Relocation::spec_simple(disp_reloc);
58   }
59 
60   Register rindex = as_Register(index);
61   if (rindex != PC) {
62     assert(disp == 0, "unsupported");
63     Address madr(as_Register(base), rindex, lsl, scale);
64     madr._rspec = rspec;
65     return madr;
66   } else {
67     assert(scale == 0, "not supported");
68     Address madr(as_Register(base), disp);
69     madr._rspec = rspec;
70     return madr;
71   }
72 }
73 #endif
74 
75 void AsmOperand::initialize_rotated_imm(unsigned int imm) {
76   for (int shift = 2; shift <= 24; shift += 2) {
77     if ((imm & ~(0xff << shift)) == 0) {
78       _encoding = 1 << 25 | (32 - shift) << 7 | imm >> shift;
79       return;
80     }
81   }
82   assert((imm & 0x0ffffff0) == 0, "too complicated constant: %d (%x)", imm, imm);
83   _encoding = 1 << 25 | 4 << 7 | imm >> 28 | imm << 4;
84 }
85 
86 bool AsmOperand::is_rotated_imm(unsigned int imm) {
87   if ((imm >> 8) == 0) {
88     return true;
89   }
90   for (int shift = 2; shift <= 24; shift += 2) {
91     if ((imm & ~(0xff << shift)) == 0) {
92       return true;
93     }
94   }
95   if ((imm & 0x0ffffff0) == 0) {
96     return true;
97   }
98   return false;
99 }