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<p class="MsoNormal"><span style="font-size:11.0pt">Yes, this is a bug in labels inflation for older class files versions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I’ve filled a bug <a href="https://bugs.openjdk.org/browse/JDK-8339368">
https://bugs.openjdk.org/browse/JDK-8339368</a> based on your test case and started work on a fix.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thank you for discovering it!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">classfile-api-dev <classfile-api-dev-retn@openjdk.org> on behalf of david32768@btinternet.com <david32768@btinternet.com><br>
<b>Date: </b>Saturday, 31 August 2024 at 9:18<br>
<b>To: </b>classfile-api-dev@openjdk.org <classfile-api-dev@openjdk.org><br>
<b>Subject: </b>Switch targets are not inflated in CodeModel if no StackMap.<o:p></o:p></span></p>
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<p>Method jdk/internal/CodeImpl.inflateJumpTargets should also inflate switch instructions.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>Perhaps BranchInstruction, JsrInstruction, TableSwitchInstruction, LookupSwitchInstruction should implement an interface with method List<Label> targets().<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>build test method<br>
```<br>
private static void build(CodeBuilder cob) {<br>
Label L1 = cob.newLabel();<br>
Label L2 = cob.newLabel();<br>
SwitchCase sc1 = SwitchCase.of(0,L2);<br>
List<SwitchCase> cases = new ArrayList<>();<br>
cases.add(sc1);<br>
cob.iload(0)<br>
.lookupswitch(L1, cases)<br>
.labelBinding(L2)<br>
.iconst_1()<br>
.ireturn()<br>
.labelBinding(L1)<br>
.iconst_0()<br>
.ireturn();<br>
}<o:p></o:p></p>
<p>```<o:p></o:p></p>
<p>print of elements in CodeModel<br>
```<br>
Load[OP=ILOAD_0, slot=0]<br>
LookupSwitch[OP=LOOKUPSWITCH]<br>
UnboundIntrinsicConstantInstruction[op=ICONST_1]<br>
Return[OP=IRETURN]<br>
UnboundIntrinsicConstantInstruction[op=ICONST_0]<br>
Return[OP=IRETURN]<o:p></o:p></p>
<p>```<o:p></o:p></p>
<p>test driver class<br>
```<br>
public static void main(String[] args) throws IOException {<br>
byte[] bytes = ClassFile.of()<br>
.build(ClassDesc.of("TestSwitchInflate"),<br>
clb -> clb.withFlags(ClassFile.ACC_PUBLIC | ClassFile.ACC_SUPER)<br>
.withVersion(49,0)<br>
.withMethodBody("Table", MethodTypeDesc.ofDescriptor("(I)I"),<br>
ClassFile.ACC_STATIC, SwitchInflate::build));<br>
ClassFile.of().parse(bytes)<br>
.methods().stream()<br>
.flatMap(m -> m.code().stream())<br>
.flatMap(c -> c.elementStream())<br>
.forEach(System.out::println);<br>
}<o:p></o:p></p>
<p>```<br>
<o:p></o:p></p>
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