1 /*
2 * Copyright (c) 2013, 2015, 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 package org.graalvm.compiler.hotspot.aarch64;
24
25 import static jdk.vm.ci.aarch64.AArch64.zr;
26 import static jdk.vm.ci.code.ValueUtil.asRegister;
27 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.HINT;
28 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.ILLEGAL;
29 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
30 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;
31
32 import org.graalvm.compiler.asm.Label;
33 import org.graalvm.compiler.asm.aarch64.AArch64Assembler;
34 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
35 import org.graalvm.compiler.core.common.CompressEncoding;
36 import org.graalvm.compiler.lir.LIRInstructionClass;
37 import org.graalvm.compiler.lir.StandardOp.LoadConstantOp;
38 import org.graalvm.compiler.lir.aarch64.AArch64LIRInstruction;
39 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
40
41 import jdk.vm.ci.code.Register;
42 import jdk.vm.ci.hotspot.HotSpotConstant;
43 import jdk.vm.ci.meta.AllocatableValue;
44 import jdk.vm.ci.meta.Constant;
45
46 public class AArch64HotSpotMove {
47
48 public static class LoadHotSpotObjectConstantInline extends AArch64LIRInstruction implements LoadConstantOp {
49 public static final LIRInstructionClass<LoadHotSpotObjectConstantInline> TYPE = LIRInstructionClass.create(LoadHotSpotObjectConstantInline.class);
50
51 private HotSpotConstant constant;
52 @Def({REG, STACK}) AllocatableValue result;
53
54 public LoadHotSpotObjectConstantInline(HotSpotConstant constant, AllocatableValue result) {
55 super(TYPE);
56 this.constant = constant;
57 this.result = result;
58 }
59
60 @Override
61 protected void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
62 crb.recordInlineDataInCode(constant);
63 if (constant.isCompressed()) {
64 // masm.forceMov(asRegister(result), 0);
65 masm.movNarrowAddress(asRegister(result), 0);
66 } else {
67 masm.movNativeAddress(asRegister(result), 0);
68 }
69 }
70
71 @Override
72 public AllocatableValue getResult() {
73 return result;
74 }
75
76 @Override
77 public Constant getConstant() {
78 return constant;
79 }
80 }
81
82 /**
83 * Compresses a 8-byte pointer as a 4-byte int.
84 */
85 public static class CompressPointer extends AArch64LIRInstruction {
86 public static final LIRInstructionClass<CompressPointer> TYPE = LIRInstructionClass.create(CompressPointer.class);
87
88 private final CompressEncoding encoding;
89 private final boolean nonNull;
90
91 @Def({REG, HINT}) protected AllocatableValue result;
92 @Use({REG}) protected AllocatableValue input;
93 @Alive({REG, ILLEGAL}) protected AllocatableValue baseRegister;
94
95 public CompressPointer(AllocatableValue result, AllocatableValue input, AllocatableValue baseRegister, CompressEncoding encoding, boolean nonNull) {
96 super(TYPE);
97 this.result = result;
98 this.input = input;
99 this.baseRegister = baseRegister;
100 this.encoding = encoding;
101 this.nonNull = nonNull;
102 }
103
104 @Override
105 public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
106 Register resultRegister = asRegister(result);
107 Register ptr = asRegister(input);
108 Register base = asRegister(baseRegister);
109 // result = (ptr - base) >> shift
110 if (!encoding.hasBase()) {
111 if (encoding.hasShift()) {
112 masm.lshr(64, resultRegister, ptr, encoding.getShift());
113 } else {
114 masm.movx(resultRegister, ptr);
115 }
116 } else if (nonNull) {
117 masm.sub(64, resultRegister, ptr, base);
118 if (encoding.hasShift()) {
119 masm.shl(64, resultRegister, resultRegister, encoding.getShift());
120 }
121 } else {
122 // if ptr is null it still has to be null after compression
123 masm.cmp(64, ptr, 0);
124 masm.cmov(64, resultRegister, ptr, base, AArch64Assembler.ConditionFlag.NE);
125 masm.sub(64, resultRegister, resultRegister, base);
126 if (encoding.hasShift()) {
127 masm.lshr(64, resultRegister, resultRegister, encoding.getShift());
128 }
129 }
130 }
131 }
132
133 /**
134 * Decompresses a 4-byte offset into an actual pointer.
135 */
136 public static class UncompressPointer extends AArch64LIRInstruction {
137 public static final LIRInstructionClass<UncompressPointer> TYPE = LIRInstructionClass.create(UncompressPointer.class);
138
139 private final CompressEncoding encoding;
140 private final boolean nonNull;
141
142 @Def({REG}) protected AllocatableValue result;
143 @Use({REG}) protected AllocatableValue input;
144 @Alive({REG, ILLEGAL}) protected AllocatableValue baseRegister;
145
146 public UncompressPointer(AllocatableValue result, AllocatableValue input, AllocatableValue baseRegister, CompressEncoding encoding, boolean nonNull) {
147 super(TYPE);
148 this.result = result;
149 this.input = input;
150 this.baseRegister = baseRegister;
151 this.encoding = encoding;
152 this.nonNull = nonNull;
153 }
154
155 @Override
156 public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
157 Register ptr = asRegister(input);
158 Register resultRegister = asRegister(result);
159 Register base = asRegister(baseRegister);
160 // result = base + (ptr << shift)
161 if (nonNull) {
162 masm.add(64, resultRegister, base, ptr, AArch64Assembler.ShiftType.LSL, encoding.getShift());
163 } else if (!encoding.hasBase()) {
164 masm.add(64, resultRegister, zr, ptr, AArch64Assembler.ShiftType.LSL, encoding.getShift());
165 } else {
166 // if ptr is null it has to be null after decompression
167 Label done = new Label();
168 if (!resultRegister.equals(ptr)) {
169 masm.mov(32, resultRegister, ptr);
170 }
171 masm.cbz(32, resultRegister, done);
172 masm.add(64, resultRegister, base, resultRegister, AArch64Assembler.ShiftType.LSL, encoding.getShift());
173 masm.bind(done);
174 }
175 }
176 }
177
178 //
179 // private static void decompressPointer(CompilationResultBuilder crb, ARMv8MacroAssembler masm,
180 // Register result,
181 // Register ptr, long base, int shift, int alignment) {
182 // assert base != 0 || shift == 0 || alignment == shift;
183 // // result = heapBase + ptr << alignment
184 // Register heapBase = ARMv8.heapBaseRegister;
185 // // if result == 0, we make sure that it will still be 0 at the end, so that it traps when
186 // // loading storing a value.
187 // masm.cmp(32, ptr, 0);
188 // masm.add(64, result, heapBase, ptr, ARMv8Assembler.ExtendType.UXTX, alignment);
189 // masm.cmov(64, result, result, ARMv8.zr, ARMv8Assembler.ConditionFlag.NE);
190 // }
191
192 public static void decodeKlassPointer(AArch64MacroAssembler masm, Register result, Register ptr, Register klassBase, CompressEncoding encoding) {
193 // result = klassBase + ptr << shift
194 if (encoding.hasShift() || encoding.hasBase()) {
195 masm.add(64, result, klassBase, ptr, AArch64Assembler.ExtendType.UXTX, encoding.getShift());
196 }
197 }
198
199 }