1 /*
2 * Copyright (c) 2014, 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.lir.sparc;
24
25 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;
26 import static org.graalvm.compiler.lir.sparc.SPARCDelayedControlTransfer.DUMMY;
27 import static jdk.vm.ci.code.ValueUtil.asStackSlot;
28 import static jdk.vm.ci.code.ValueUtil.isStackSlot;
29
30 import java.util.Arrays;
31 import java.util.Set;
32
33 import org.graalvm.compiler.asm.sparc.SPARCAddress;
34 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
35 import org.graalvm.compiler.lir.LIRInstructionClass;
36 import org.graalvm.compiler.lir.LIRValueUtil;
37 import org.graalvm.compiler.lir.Opcode;
38 import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
39 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
40 import org.graalvm.compiler.lir.framemap.FrameMap;
41
42 import jdk.vm.ci.code.Register;
43 import jdk.vm.ci.code.RegisterSaveLayout;
44 import jdk.vm.ci.code.RegisterValue;
45 import jdk.vm.ci.code.StackSlot;
46 import jdk.vm.ci.meta.AllocatableValue;
47 import jdk.vm.ci.sparc.SPARC;
48
49 /**
50 * Saves registers to stack slots.
51 */
52 @Opcode("SAVE_REGISTER")
53 public class SPARCSaveRegistersOp extends SPARCLIRInstruction implements SaveRegistersOp {
54 public static final LIRInstructionClass<SPARCSaveRegistersOp> TYPE = LIRInstructionClass.create(SPARCSaveRegistersOp.class);
55 public static final Register RETURN_REGISTER_STORAGE = SPARC.d62;
56 public static final SizeEstimate SIZE = SizeEstimate.create(32);
57 /**
58 * The registers (potentially) saved by this operation.
59 */
60 protected final Register[] savedRegisters;
61
62 /**
63 * The slots to which the registers are saved.
64 */
65 @Def(STACK) protected final AllocatableValue[] slots;
66
67 /**
68 * Specifies if {@link #remove(Set)} should have an effect.
69 */
70 protected final boolean supportsRemove;
71
72 /**
73 *
74 * @param savedRegisters the registers saved by this operation which may be subject to
75 * {@linkplain #remove(Set) pruning}
76 * @param savedRegisterLocations the slots to which the registers are saved
77 * @param supportsRemove determines if registers can be {@linkplain #remove(Set) pruned}
78 */
79 public SPARCSaveRegistersOp(Register[] savedRegisters, AllocatableValue[] savedRegisterLocations, boolean supportsRemove) {
80 super(TYPE, SIZE);
81 assert Arrays.asList(savedRegisterLocations).stream().allMatch(LIRValueUtil::isVirtualStackSlot);
82 this.savedRegisters = savedRegisters;
83 this.slots = savedRegisterLocations;
84 this.supportsRemove = supportsRemove;
85 }
86
87 @Override
88 public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
89 // Can be used with VIS3
90 // new Movxtod(SPARC.i0, RETURN_REGISTER_STORAGE).emit(masm);
91 // We abuse the first stackslot for transferring i0 to return_register_storage
92 // assert slots.length >= 1;
93 SPARCAddress slot0Address = (SPARCAddress) crb.asAddress(slots[0]);
94 masm.stx(SPARC.i0, slot0Address);
95 masm.lddf(slot0Address, RETURN_REGISTER_STORAGE);
96
97 // Now save the registers
98 for (int i = 0; i < savedRegisters.length; i++) {
99 if (savedRegisters[i] != null) {
100 assert isStackSlot(slots[i]) : "not a StackSlot: " + slots[i];
101 Register savedRegister = savedRegisters[i];
102 StackSlot slot = asStackSlot(slots[i]);
103 SPARCAddress slotAddress = (SPARCAddress) crb.asAddress(slot);
104 RegisterValue input = savedRegister.asValue(slot.getValueKind());
105 SPARCMove.emitStore(input, slotAddress, slot.getPlatformKind(), DUMMY, null, crb, masm);
106 }
107 }
108 }
109
110 public AllocatableValue[] getSlots() {
111 return slots;
112 }
113
114 @Override
115 public boolean supportsRemove() {
116 return supportsRemove;
117 }
118
119 @Override
120 public int remove(Set<Register> doNotSave) {
121 if (!supportsRemove) {
122 throw new UnsupportedOperationException();
123 }
124 return prune(doNotSave, savedRegisters);
125 }
126
127 static int prune(Set<Register> toRemove, Register[] registers) {
128 int pruned = 0;
129 for (int i = 0; i < registers.length; i++) {
130 if (registers[i] != null) {
131 if (toRemove.contains(registers[i])) {
132 registers[i] = null;
133 pruned++;
134 }
135 }
136 }
137 return pruned;
138 }
139
140 @Override
141 public RegisterSaveLayout getMap(FrameMap frameMap) {
142 int total = 0;
143 for (int i = 0; i < savedRegisters.length; i++) {
144 if (savedRegisters[i] != null) {
145 total++;
146 }
147 }
148 Register[] keys = new Register[total];
149 int[] values = new int[total];
150 if (total != 0) {
151 int mapIndex = 0;
152 for (int i = 0; i < savedRegisters.length; i++) {
153 if (savedRegisters[i] != null) {
154 keys[mapIndex] = savedRegisters[i];
155 assert isStackSlot(slots[i]) : "not a StackSlot: " + slots[i];
156 StackSlot slot = asStackSlot(slots[i]);
157 values[mapIndex] = indexForStackSlot(frameMap, slot);
158 mapIndex++;
159 }
160 }
161 assert mapIndex == total;
162 }
163 return new RegisterSaveLayout(keys, values);
164 }
165
166 /**
167 * Computes the index of a stack slot relative to slot 0. This is also the bit index of stack
168 * slots in the reference map.
169 *
170 * @param slot a stack slot
171 * @return the index of the stack slot
172 */
173 private static int indexForStackSlot(FrameMap frameMap, StackSlot slot) {
174 assert frameMap.offsetForStackSlot(slot) % frameMap.getTarget().wordSize == 0;
175 int value = frameMap.offsetForStackSlot(slot) / frameMap.getTarget().wordSize;
176 return value;
177 }
178 }