1 /*
2 * Copyright (c) 2024, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package hat;
26
27
28 import hat.backend.Backend;
29 import hat.buffer.Buffer;
30 import hat.buffer.BufferAllocator;
31 import hat.buffer.BufferTracker;
32 import hat.ifacemapper.BoundSchema;
33 import hat.ifacemapper.SegmentMapper;
34 import hat.optools.LambdaOpWrapper;
35 import hat.optools.OpWrapper;
36
37 import java.lang.invoke.MethodHandles;
38 import java.lang.reflect.Method;
39
40 import jdk.incubator.code.Op;
41 import jdk.incubator.code.Quotable;
42 import jdk.incubator.code.Quoted;
43 import jdk.incubator.code.dialect.core.CoreOp;
44 import jdk.incubator.code.dialect.java.JavaOp;
45
46 import java.util.HashMap;
47 import java.util.Map;
48 import java.util.ServiceLoader;
49 import java.util.function.Consumer;
50 import java.util.function.Predicate;
51
52 import static hat.backend.Backend.FIRST;
53
54 /**
55 * This class provides the developer facing view of HAT, and wraps a <a href="backend/Backend.html">Backend</a> capable of
56 * executing <b>NDRange</b> style execution.
57 * <p/>
58 * An Accelerator is provided a <a href="java/lang/invoke/MethodHandles.Lookup.html">MethodHandles.Lookup</a> with visibility to the
59 * compute to be performed.
60 * <p/>
61 * As well we either a <a href="backend/Backend.html">Backend</a> directly
62 * <pre>
63 * Accelerator accelerator =
64 * new Accelerator(MethodHandles.lookup(),
65 * new JavaMultiThreadedBackend());
66 * </pre>
67 * or a {@code java.util.function.Predicate<Backend>} which can be used to select the required {@code Backend}
68 * loaded via Javas ServiceLoader mechanism
69 * {@code}
70 * <pre>
71 * Accelerator accelerator =
72 * new Accelerator(MethodHandles.lookup(),
73 * be -> be.name().startsWith("OpenCL));
74 * </pre>}
75 *
76 * @author Gary Frost
77 */
78 public class Accelerator implements BufferAllocator, BufferTracker {
79 public MethodHandles.Lookup lookup;
80 public final Backend backend;
81
82 private final Map<Method, hat.ComputeContext> cache = new HashMap<>();
83
84 public NDRange range(int max) {
85 NDRange ndRange = new NDRange(this);
86 ndRange.kid = new KernelContext(ndRange, max, 0);
87 return ndRange;
88 }
89
90
91 protected Accelerator(MethodHandles.Lookup lookup, ServiceLoader.Provider<Backend> provider) {
92 this(lookup, provider.get());
93 }
94 public Accelerator(MethodHandles.Lookup lookup) {
95 this(lookup, FIRST);
96 }
97
98 /**
99 * @param lookup
100 * @param backend
101 */
102 public Accelerator(MethodHandles.Lookup lookup, Backend backend) {
103 this.lookup = lookup;
104 this.backend = backend;
105 }
106
107 /**
108 * @param lookup
109 * @param backendPredicate
110 */
111 public Accelerator(MethodHandles.Lookup lookup, Predicate<Backend> backendPredicate) {
112 this(lookup, Backend.getBackend(backendPredicate));
113 }
114
115 @Override
116 public <T extends Buffer> T allocate(SegmentMapper<T> segmentMapper, BoundSchema<T> boundShema) {
117 return backend.allocate(segmentMapper, boundShema);
118 }
119
120 @Override
121 public void preMutate(Buffer b) {
122 if (backend instanceof BufferTracker) {
123 ((BufferTracker) backend).preMutate(b);
124 }
125 }
126
127 @Override
128 public void postMutate(Buffer b) {
129 if (backend instanceof BufferTracker) {
130 ((BufferTracker) backend).postMutate(b);
131 }
132 }
133
134 @Override
135 public void preAccess(Buffer b) {
136 if (backend instanceof BufferTracker) {
137 ((BufferTracker) backend).preAccess(b);
138 }
139 }
140
141 @Override
142 public void postAccess(Buffer b) {
143 if (backend instanceof BufferTracker) {
144 ((BufferTracker) backend).postAccess(b);
145 }
146 }
147 /*
148 @Override
149 public void preEscape(Buffer b) {
150 if (backend instanceof BufferTracker) {
151 ((BufferTracker) backend).preEscape(b);
152 }
153 }
154
155 @Override
156 public void postEscape(Buffer b) {
157 if (backend instanceof BufferTracker) {
158 ((BufferTracker) backend).postEscape(b);
159 }
160 } */
161
162 /**
163 * An interface used for wrapping the compute entrypoint of work to be performed by the Accelerator.
164 * <p/>
165 * So given a ComputeClass such as...
166 * <pre>
167 * public class MyComputeClass {
168 * @ CodeReflection
169 * public static void addDeltaKernel(KernelContext kc, S32Array arrayOfInt, int delta) {
170 * arrayOfInt.array(kc.x, arrayOfInt.array(kc.x)+delta);
171 * }
172 *
173 * @ CodeReflection
174 * static public void doSomeWork(final ComputeContext cc, S32Array arrayOfInt) {
175 * }
176 * }
177 * </pre>
178 * The accelerator will be passed the doSomeWork entrypoint, wrapped in a {@code QuotableComputeContextConsumer}
179 * <pre>
180 * accelerator.compute(cc ->
181 * MyCompute.doSomeWork(cc, arrayOfInt)
182 * );
183 * </pre>
184 */
185 public interface QuotableComputeContextConsumer extends Quotable, Consumer<ComputeContext> {
186 }
187
188 /**
189 * This method provides the Accelerator with the {@code Compute Entrypoint} from a Compute class.
190 * <p>
191 * The entrypoint is wrapped in a <a href="QuotableComputeContextConsumer.html">QuotableComputeContextConsumer</a> lambda.
192 *
193 * <pre>
194 * accelerator.compute(cc ->
195 * MyCompute.doSomeWork(cc, intArray)
196 * )
197 * </pre>
198 */
199
200 public void compute(QuotableComputeContextConsumer quotableComputeContextConsumer) {
201 Quoted quoted = Op.ofQuotable(quotableComputeContextConsumer).orElseThrow();
202 LambdaOpWrapper lambda = OpWrapper.wrap(lookup,(JavaOp.LambdaOp) quoted.op());
203 Method method = lambda.getQuotableTargetMethod();
204
205 // Create (or get cached) a compute context which closes over compute entryppint and reachable kernels.
206 // The models of all compute and kernel methods are passed to the backend during creation
207 // The backend may well mutate the models.
208 // It will also use this opportunity to generate ISA specific code for the kernels.
209 ComputeContext computeContext = cache.computeIfAbsent(method, (_) ->
210 new ComputeContext(this, method)
211 );
212 // Here we get the captured values from the Quotable
213 Object[] args = lambda.getQuotableCapturedValues(quoted, method);
214 args[0] = computeContext;
215
216 // now ask the backend to execute
217 backend.dispatchCompute(computeContext, args);
218 }
219 }