1 /*
2 * Copyright (c) 2022, 2025, 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 jdk.internal.classfile.impl;
26
27 import java.lang.classfile.*;
28 import java.lang.classfile.attribute.CodeAttribute;
29 import java.lang.classfile.attribute.RuntimeInvisibleTypeAnnotationsAttribute;
30 import java.lang.classfile.attribute.RuntimeVisibleTypeAnnotationsAttribute;
31 import java.lang.classfile.attribute.StackMapTableAttribute;
32 import java.lang.classfile.constantpool.ClassEntry;
33 import java.lang.classfile.instruction.*;
34 import java.util.ArrayList;
35 import java.util.Collections;
36 import java.util.List;
37 import java.util.Objects;
38 import java.util.Optional;
39 import java.util.function.Consumer;
40
41 import static jdk.internal.classfile.impl.RawBytecodeHelper.*;
42
43 public final class CodeImpl
44 extends BoundAttribute.BoundCodeAttribute
45 implements LabelContext {
46
47 static final Instruction[] SINGLETON_INSTRUCTIONS = new Instruction[256];
48
49 static {
50 for (var o : Opcode.values()) {
51 if (o.sizeIfFixed() == 1) {
52 SINGLETON_INSTRUCTIONS[o.bytecode()] = switch (o.kind()) {
53 case ARRAY_LOAD -> ArrayLoadInstruction.of(o);
54 case ARRAY_STORE -> ArrayStoreInstruction.of(o);
55 case CONSTANT -> ConstantInstruction.ofIntrinsic(o);
56 case CONVERT -> ConvertInstruction.of(o);
57 case LOAD -> new AbstractInstruction.UnboundLoadInstruction(o, BytecodeHelpers.intrinsicLoadSlot(o));
58 case MONITOR -> MonitorInstruction.of(o);
59 case NOP -> NopInstruction.of();
60 case OPERATOR -> OperatorInstruction.of(o);
61 case RETURN -> ReturnInstruction.of(o);
62 case STACK -> StackInstruction.of(o);
63 case STORE -> new AbstractInstruction.UnboundStoreInstruction(o, BytecodeHelpers.intrinsicStoreSlot(o));
64 case THROW_EXCEPTION -> ThrowInstruction.of();
65 default -> throw new AssertionError("invalid opcode: " + o);
66 };
67 }
68 }
69 }
70
71 List<ExceptionCatch> exceptionTable;
72 List<Attribute<?>> attributes;
73
74 // Inflated for iteration
75 LabelImpl[] labels;
76 int[] lineNumbers;
77 boolean inflated;
78
79 public CodeImpl(AttributedElement enclosing,
80 ClassReader reader,
81 AttributeMapper<CodeAttribute> mapper,
82 int payloadStart) {
83 super(enclosing, reader, mapper, payloadStart);
84 }
85
86 // LabelContext
87
88 @Override
89 public Label newLabel() {
90 throw new UnsupportedOperationException("CodeAttribute only supports fixed labels");
91 }
92
93 @Override
94 public void setLabelTarget(Label label, int bci) {
95 throw new UnsupportedOperationException("CodeAttribute only supports fixed labels");
96 }
97
98 @Override
99 public Label getLabel(int bci) {
100 if (bci < 0 || bci > codeLength)
101 throw new IllegalArgumentException(String.format("Bytecode offset out of range; bci=%d, codeLength=%d",
102 bci, codeLength));
103 if (labels == null)
104 labels = new LabelImpl[codeLength + 1];
105 LabelImpl l = labels[bci];
106 if (l == null)
107 l = labels[bci] = new LabelImpl(this, bci);
108 return l;
109 }
110
111 @Override
112 public int labelToBci(Label label) {
113 LabelImpl lab = (LabelImpl) label;
114 if (lab.labelContext() != this)
115 throw new IllegalArgumentException(String.format("Illegal label reuse; context=%s, label=%s",
116 this, lab.labelContext()));
117 return lab.getBCI();
118 }
119
120 private void inflateMetadata() {
121 if (!inflated) {
122 if (labels == null)
123 labels = new LabelImpl[codeLength + 1];
124 if (classReader.context().passLineNumbers())
125 inflateLineNumbers();
126 inflateJumpTargets();
127 inflateTypeAnnotations();
128 inflated = true;
129 }
130 }
131
132 // CodeAttribute
133
134 @Override
135 public List<Attribute<?>> attributes() {
136 if (attributes == null) {
137 attributes = BoundAttribute.readAttributes(this, classReader, attributePos, classReader.customAttributes());
138 }
139 return attributes;
140 }
141
142 @Override
143 public void writeTo(BufWriterImpl buf) {
144 if (buf.canWriteDirect(classReader)) {
145 super.writeTo(buf);
146 }
147 else {
148 DirectCodeBuilder.build((MethodInfo) enclosingMethod,
149 Util.writingAll(this),
150 (SplitConstantPool)buf.constantPool(),
151 buf.context(),
152 null).writeTo(buf);
153 }
154 }
155
156 // CodeModel
157
158 @Override
159 public Optional<MethodModel> parent() {
160 return Optional.of(enclosingMethod);
161 }
162
163 @Override
164 public void forEach(Consumer<? super CodeElement> consumer) {
165 Objects.requireNonNull(consumer);
166 inflateMetadata();
167 boolean doLineNumbers = (lineNumbers != null);
168 generateCatchTargets(consumer);
169 if (classReader.context().passDebugElements())
170 generateDebugElements(consumer);
171 for (int pos=codeStart; pos<codeEnd; ) {
172 if (labels[pos - codeStart] != null)
173 consumer.accept(labels[pos - codeStart]);
174 if (doLineNumbers && lineNumbers[pos - codeStart] != 0)
175 consumer.accept(LineNumberImpl.of(lineNumbers[pos - codeStart]));
176 int bc = classReader.readU1(pos);
177 Instruction instr = bcToInstruction(bc, pos);
178 consumer.accept(instr);
179 pos += instr.sizeInBytes();
180 }
181 // There might be labels pointing to the bci at codeEnd
182 if (labels[codeEnd-codeStart] != null)
183 consumer.accept(labels[codeEnd - codeStart]);
184 if (doLineNumbers && lineNumbers[codeEnd - codeStart] != 0)
185 consumer.accept(LineNumberImpl.of(lineNumbers[codeEnd - codeStart]));
186 }
187
188 @Override
189 public List<ExceptionCatch> exceptionHandlers() {
190 if (exceptionTable == null) {
191 inflateMetadata();
192 exceptionTable = new ArrayList<>(exceptionHandlerCnt);
193 iterateExceptionHandlers(new ExceptionHandlerAction() {
194 @Override
195 public void accept(int s, int e, int h, int c) {
196 ClassEntry catchTypeEntry = c == 0
197 ? null
198 : constantPool().entryByIndex(c, ClassEntry.class);
199 exceptionTable.add(new AbstractPseudoInstruction.ExceptionCatchImpl(getLabel(h), getLabel(s), getLabel(e), catchTypeEntry));
200 }
201 });
202 exceptionTable = Collections.unmodifiableList(exceptionTable);
203 }
204 return exceptionTable;
205 }
206
207 public boolean compareCodeBytes(BufWriterImpl buf, int offset, int len) {
208 return codeLength == len
209 && classReader.compare(buf, offset, codeStart, codeLength);
210 }
211
212 private int adjustForObjectOrUninitialized(int bci) {
213 int vt = classReader.readU1(bci);
214 //inflate newTarget labels from Uninitialized VTIs
215 if (vt == 8) inflateLabel(classReader.readU2(bci + 1));
216 return (vt == 7 || vt == 8) ? bci + 3 : bci + 1;
217 }
218
219 private void inflateLabel(int bci) {
220 if (bci < 0 || bci > codeLength)
221 throw new IllegalArgumentException(String.format("Bytecode offset out of range; bci=%d, codeLength=%d",
222 bci, codeLength));
223 if (labels[bci] == null)
224 labels[bci] = new LabelImpl(this, bci);
225 }
226
227 private void inflateLineNumbers() {
228 for (Attribute<?> a : attributes()) {
229 if (a.attributeMapper() == Attributes.lineNumberTable()) {
230 BoundLineNumberTableAttribute attr = (BoundLineNumberTableAttribute) a;
231 if (lineNumbers == null)
232 lineNumbers = new int[codeLength + 1];
233
234 int nLn = classReader.readU2(attr.payloadStart);
235 int p = attr.payloadStart + 2;
236 int pEnd = p + (nLn * 4);
237 for (; p < pEnd; p += 4) {
238 int startPc = classReader.readU2(p);
239 if (startPc > codeLength) {
240 throw new IllegalArgumentException(String.format(
241 "Line number start_pc out of range; start_pc=%d, codeLength=%d", startPc, codeLength));
242 }
243 int lineNumber = classReader.readU2(p + 2);
244 lineNumbers[startPc] = lineNumber;
245 }
246 }
247 }
248 }
249
250 private void inflateJumpTargets() {
251 Optional<StackMapTableAttribute> a = findAttribute(Attributes.stackMapTable());
252 if (a.isEmpty()) {
253 if (classReader.readU2(6) <= ClassFile.JAVA_6_VERSION) {
254 //fallback to jump targets inflation without StackMapTableAttribute
255 for (int pos=codeStart; pos<codeEnd; ) {
256 var i = bcToInstruction(classReader.readU1(pos), pos);
257 switch (i) {
258 case BranchInstruction br -> br.target();
259 case DiscontinuedInstruction.JsrInstruction jsr -> jsr.target();
260 case LookupSwitchInstruction ls -> {
261 ls.defaultTarget();
262 ls.cases();
263 }
264 case TableSwitchInstruction ts -> {
265 ts.defaultTarget();
266 ts.cases();
267 }
268 default -> {}
269 }
270 pos += i.sizeInBytes();
271 }
272 }
273 return;
274 }
275 int stackMapPos = ((BoundAttribute<StackMapTableAttribute>) a.get()).payloadStart;
276
277 int bci = -1; //compensate for offsetDelta + 1
278 int nEntries = classReader.readU2(stackMapPos);
279 int p = stackMapPos + 2;
280 for (int i = 0; i < nEntries; ++i) {
281 int frameType = classReader.readU1(p);
282 int offsetDelta;
283 if (frameType < 64) {
284 offsetDelta = frameType;
285 ++p;
286 }
287 else if (frameType < 128) {
288 offsetDelta = frameType & 0x3f;
289 p = adjustForObjectOrUninitialized(p + 1);
290 }
291 else
292 switch (frameType) {
293 case 247 -> {
294 offsetDelta = classReader.readU2(p + 1);
295 p = adjustForObjectOrUninitialized(p + 3);
296 }
297 case 248, 249, 250, 251 -> {
298 offsetDelta = classReader.readU2(p + 1);
299 p += 3;
300 }
301 case 252, 253, 254 -> {
302 offsetDelta = classReader.readU2(p + 1);
303 int k = frameType - 251;
304 p += 3;
305 for (int c = 0; c < k; ++c) {
306 p = adjustForObjectOrUninitialized(p);
307 }
308 }
309 case 255 -> {
310 offsetDelta = classReader.readU2(p + 1);
311 p += 3;
312 int k = classReader.readU2(p);
313 p += 2;
314 for (int c = 0; c < k; ++c) {
315 p = adjustForObjectOrUninitialized(p);
316 }
317 k = classReader.readU2(p);
318 p += 2;
319 for (int c = 0; c < k; ++c) {
320 p = adjustForObjectOrUninitialized(p);
321 }
322 }
323 default -> throw new IllegalArgumentException("Bad frame type: " + frameType);
324 }
325 bci += offsetDelta + 1;
326 inflateLabel(bci);
327 }
328 }
329
330 private void inflateTypeAnnotations() {
331 findAttribute(Attributes.runtimeVisibleTypeAnnotations()).ifPresent(RuntimeVisibleTypeAnnotationsAttribute::annotations);
332 findAttribute(Attributes.runtimeInvisibleTypeAnnotations()).ifPresent(RuntimeInvisibleTypeAnnotationsAttribute::annotations);
333 }
334
335 private void generateCatchTargets(Consumer<? super CodeElement> consumer) {
336 // We attach all catch targets to bci zero, because trying to attach them
337 // to their range could subtly affect the order of exception processing
338 iterateExceptionHandlers(new ExceptionHandlerAction() {
339 @Override
340 public void accept(int s, int e, int h, int c) {
341 ClassEntry catchType = c == 0
342 ? null
343 : classReader.entryByIndex(c, ClassEntry.class);
344 consumer.accept(new AbstractPseudoInstruction.ExceptionCatchImpl(getLabel(h), getLabel(s), getLabel(e), catchType));
345 }
346 });
347 }
348
349 private void generateDebugElements(Consumer<? super CodeElement> consumer) {
350 for (Attribute<?> a : attributes()) {
351 if (a.attributeMapper() == Attributes.characterRangeTable()) {
352 var attr = (BoundCharacterRangeTableAttribute) a;
353 int cnt = classReader.readU2(attr.payloadStart);
354 int p = attr.payloadStart + 2;
355 int pEnd = p + (cnt * 14);
356 for (; p < pEnd; p += 14) {
357 var instruction = new BoundCharacterRange(this, p);
358 inflateLabel(instruction.startPc());
359 inflateLabel(instruction.endPc() + 1);
360 consumer.accept(instruction);
361 }
362 }
363 else if (a.attributeMapper() == Attributes.localVariableTable()) {
364 var attr = (BoundLocalVariableTableAttribute) a;
365 int cnt = classReader.readU2(attr.payloadStart);
366 int p = attr.payloadStart + 2;
367 int pEnd = p + (cnt * 10);
368 for (; p < pEnd; p += 10) {
369 BoundLocalVariable instruction = new BoundLocalVariable(this, p);
370 inflateLabel(instruction.startPc());
371 inflateLabel(instruction.startPc() + instruction.length());
372 consumer.accept(instruction);
373 }
374 }
375 else if (a.attributeMapper() == Attributes.localVariableTypeTable()) {
376 var attr = (BoundLocalVariableTypeTableAttribute) a;
377 int cnt = classReader.readU2(attr.payloadStart);
378 int p = attr.payloadStart + 2;
379 int pEnd = p + (cnt * 10);
380 for (; p < pEnd; p += 10) {
381 BoundLocalVariableType instruction = new BoundLocalVariableType(this, p);
382 inflateLabel(instruction.startPc());
383 inflateLabel(instruction.startPc() + instruction.length());
384 consumer.accept(instruction);
385 }
386 }
387 else if (a.attributeMapper() == Attributes.runtimeVisibleTypeAnnotations()) {
388 consumer.accept((BoundRuntimeVisibleTypeAnnotationsAttribute) a);
389 }
390 else if (a.attributeMapper() == Attributes.runtimeInvisibleTypeAnnotations()) {
391 consumer.accept((BoundRuntimeInvisibleTypeAnnotationsAttribute) a);
392 }
393 }
394 }
395
396 public interface ExceptionHandlerAction {
397 void accept(int start, int end, int handler, int catchTypeIndex);
398 }
399
400 public void iterateExceptionHandlers(ExceptionHandlerAction a) {
401 int p = exceptionHandlerPos + 2;
402 for (int i = 0; i < exceptionHandlerCnt; ++i) {
403 a.accept(classReader.readU2(p), classReader.readU2(p + 2), classReader.readU2(p + 4), classReader.readU2(p + 6));
404 p += 8;
405 }
406 }
407
408 private Instruction bcToInstruction(int bc, int pos) {
409 return switch (bc) {
410 case BIPUSH -> new AbstractInstruction.BoundArgumentConstantInstruction(Opcode.BIPUSH, CodeImpl.this, pos);
411 case SIPUSH -> new AbstractInstruction.BoundArgumentConstantInstruction(Opcode.SIPUSH, CodeImpl.this, pos);
412 case LDC -> new AbstractInstruction.BoundLoadConstantInstruction(Opcode.LDC, CodeImpl.this, pos);
413 case LDC_W -> new AbstractInstruction.BoundLoadConstantInstruction(Opcode.LDC_W, CodeImpl.this, pos);
414 case LDC2_W -> new AbstractInstruction.BoundLoadConstantInstruction(Opcode.LDC2_W, CodeImpl.this, pos);
415 case ILOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.ILOAD, CodeImpl.this, pos);
416 case LLOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.LLOAD, CodeImpl.this, pos);
417 case FLOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.FLOAD, CodeImpl.this, pos);
418 case DLOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.DLOAD, CodeImpl.this, pos);
419 case ALOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.ALOAD, CodeImpl.this, pos);
420 case ISTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.ISTORE, CodeImpl.this, pos);
421 case LSTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.LSTORE, CodeImpl.this, pos);
422 case FSTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.FSTORE, CodeImpl.this, pos);
423 case DSTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.DSTORE, CodeImpl.this, pos);
424 case ASTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.ASTORE, CodeImpl.this, pos);
425 case IINC -> new AbstractInstruction.BoundIncrementInstruction(Opcode.IINC, CodeImpl.this, pos);
426 case IFEQ -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFEQ, CodeImpl.this, pos);
427 case IFNE -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFNE, CodeImpl.this, pos);
428 case IFLT -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFLT, CodeImpl.this, pos);
429 case IFGE -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFGE, CodeImpl.this, pos);
430 case IFGT -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFGT, CodeImpl.this, pos);
431 case IFLE -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFLE, CodeImpl.this, pos);
432 case IF_ICMPEQ -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ICMPEQ, CodeImpl.this, pos);
433 case IF_ICMPNE -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ICMPNE, CodeImpl.this, pos);
434 case IF_ICMPLT -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ICMPLT, CodeImpl.this, pos);
435 case IF_ICMPGE -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ICMPGE, CodeImpl.this, pos);
436 case IF_ICMPGT -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ICMPGT, CodeImpl.this, pos);
437 case IF_ICMPLE -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ICMPLE, CodeImpl.this, pos);
438 case IF_ACMPEQ -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ACMPEQ, CodeImpl.this, pos);
439 case IF_ACMPNE -> new AbstractInstruction.BoundBranchInstruction(Opcode.IF_ACMPNE, CodeImpl.this, pos);
440 case GOTO -> new AbstractInstruction.BoundBranchInstruction(Opcode.GOTO, CodeImpl.this, pos);
441 case TABLESWITCH -> new AbstractInstruction.BoundTableSwitchInstruction(Opcode.TABLESWITCH, CodeImpl.this, pos);
442 case LOOKUPSWITCH -> new AbstractInstruction.BoundLookupSwitchInstruction(Opcode.LOOKUPSWITCH, CodeImpl.this, pos);
443 case GETSTATIC -> new AbstractInstruction.BoundFieldInstruction(Opcode.GETSTATIC, CodeImpl.this, pos);
444 case PUTSTATIC -> new AbstractInstruction.BoundFieldInstruction(Opcode.PUTSTATIC, CodeImpl.this, pos);
445 case GETFIELD -> new AbstractInstruction.BoundFieldInstruction(Opcode.GETFIELD, CodeImpl.this, pos);
446 case PUTFIELD -> new AbstractInstruction.BoundFieldInstruction(Opcode.PUTFIELD, CodeImpl.this, pos);
447 case INVOKEVIRTUAL -> new AbstractInstruction.BoundInvokeInstruction(Opcode.INVOKEVIRTUAL, CodeImpl.this, pos);
448 case INVOKESPECIAL -> new AbstractInstruction.BoundInvokeInstruction(Opcode.INVOKESPECIAL, CodeImpl.this, pos);
449 case INVOKESTATIC -> new AbstractInstruction.BoundInvokeInstruction(Opcode.INVOKESTATIC, CodeImpl.this, pos);
450 case INVOKEINTERFACE -> new AbstractInstruction.BoundInvokeInterfaceInstruction(Opcode.INVOKEINTERFACE, CodeImpl.this, pos);
451 case INVOKEDYNAMIC -> new AbstractInstruction.BoundInvokeDynamicInstruction(Opcode.INVOKEDYNAMIC, CodeImpl.this, pos);
452 case NEW -> new AbstractInstruction.BoundNewObjectInstruction(CodeImpl.this, pos);
453 case NEWARRAY -> new AbstractInstruction.BoundNewPrimitiveArrayInstruction(Opcode.NEWARRAY, CodeImpl.this, pos);
454 case ANEWARRAY -> new AbstractInstruction.BoundNewReferenceArrayInstruction(Opcode.ANEWARRAY, CodeImpl.this, pos);
455 case CHECKCAST -> new AbstractInstruction.BoundTypeCheckInstruction(Opcode.CHECKCAST, CodeImpl.this, pos);
456 case INSTANCEOF -> new AbstractInstruction.BoundTypeCheckInstruction(Opcode.INSTANCEOF, CodeImpl.this, pos);
457
458 case WIDE -> {
459 int bclow = classReader.readU1(pos + 1);
460 yield switch (bclow) {
461 case ILOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.ILOAD_W, this, pos);
462 case LLOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.LLOAD_W, this, pos);
463 case FLOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.FLOAD_W, this, pos);
464 case DLOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.DLOAD_W, this, pos);
465 case ALOAD -> new AbstractInstruction.BoundLoadInstruction(Opcode.ALOAD_W, this, pos);
466 case ISTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.ISTORE_W, this, pos);
467 case LSTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.LSTORE_W, this, pos);
468 case FSTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.FSTORE_W, this, pos);
469 case DSTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.DSTORE_W, this, pos);
470 case ASTORE -> new AbstractInstruction.BoundStoreInstruction(Opcode.ASTORE_W, this, pos);
471 case IINC -> new AbstractInstruction.BoundIncrementInstruction(Opcode.IINC_W, this, pos);
472 case RET -> new AbstractInstruction.BoundRetInstruction(Opcode.RET_W, this, pos);
473 default -> throw new IllegalArgumentException("unknown wide instruction: " + bclow);
474 };
475 }
476
477 case MULTIANEWARRAY -> new AbstractInstruction.BoundNewMultidimensionalArrayInstruction(Opcode.MULTIANEWARRAY, CodeImpl.this, pos);
478 case IFNULL -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFNULL, CodeImpl.this, pos);
479 case IFNONNULL -> new AbstractInstruction.BoundBranchInstruction(Opcode.IFNONNULL, CodeImpl.this, pos);
480 case GOTO_W -> new AbstractInstruction.BoundBranchInstruction(Opcode.GOTO_W, CodeImpl.this, pos);
481
482 case JSR -> new AbstractInstruction.BoundJsrInstruction(Opcode.JSR, CodeImpl.this, pos);
483 case RET -> new AbstractInstruction.BoundRetInstruction(Opcode.RET, this, pos);
484 case JSR_W -> new AbstractInstruction.BoundJsrInstruction(Opcode.JSR_W, CodeImpl.this, pos);
485 default -> {
486 Instruction instr = SINGLETON_INSTRUCTIONS[bc];
487 if (instr == null)
488 throw new IllegalArgumentException("unknown instruction: " + bc);
489 yield instr;
490 }
491 };
492 }
493
494 @Override
495 public String toString() {
496 return String.format("CodeModel[id=%d]", System.identityHashCode(this));
497 }
498 }