All three JNode compilers (l1a, l1b, l2) ✅ PASS for iconst_4 spec compliance

[opencode-agent]

Spec compliance report

Compiler	Status	Issues
l1a	✅ PASS	None
l1b	✅ PASS	None
l2	✅ PASS	None

---

Details

l1a Implementation

• Status: ✅ PASS
• Files: core/src/core/org/jnode/vm/x86/compiler/l1a/X86BytecodeVisitor.java:2161, core/src/core/org/jnode/vm/x86/compiler/l1a/ItemFactory.java:61, core/src/core/org/jnode/vm/x86/compiler/l1a/IntItem.java:60, core/src/core/org/jnode/vm/x86/compiler/l1a/Item.java:250
• Issues: None

Analysis:

• BytecodeParser (line 174) correctly decodes opcode 0x07 → handler.visit_iconst(4)
• X86BytecodeVisitor.visit_iconst() pushes an IntItem with JvmType.INT via ItemFactory.createIConst()
• IntItem.getType() returns JvmType.INT (category 1)
• Item.getCategory() returns 1 (correct for int)
• VirtualStack correctly tracks the single-slot push

l1b Implementation

• Status: ✅ PASS
• Files: core/src/core/org/jnode/vm/x86/compiler/l1b/X86BytecodeVisitor.java:2604, core/src/core/org/jnode/vm/x86/compiler/l1b/ItemFactory.java:56, core/src/core/org/jnode/vm/x86/compiler/l1b/IntItem.java:61, core/src/core/org/jnode/vm/x86/compiler/l1b/Item.java:235
• Issues: None

Analysis:

• Identical implementation pattern to l1a
• Adds bytecode counter for profiling
• IntItem extends WordItem with JvmType.INT, category 1
• VirtualStack correctly handles the push

l2 Implementation

• Status: ✅ PASS
• Files: core/src/core/org/jnode/vm/compiler/ir/IRGenerator.java:275, core/src/core/org/jnode/vm/x86/compiler/l2/GenericX86CodeGenerator.java:241, core/src/core/org/jnode/vm/compiler/ir/IntConstant.java:26
• Issues: None

Analysis:

• IRGenerator.visit_iconst() creates ConstantRefAssignQuad with IntConstant(value)
• Stack offset incremented by 1 (category 1)
• GenericX86CodeGenerator.generateCodeFor(ConstantRefAssignQuad) emits MOV_Const to register or stack
• L2ByteCodeSupportChecker does not override visit_iconst (inherits empty impl from BytecodeVisitorSupport) — this is correct as the checker only validates L2 eligibility, actual compilation uses IRGenerator

---

JVM Spec References

• Spec Base: https://docs.oracle.com/javase/specs/jvms/se6/html/Instructions.doc.html
• Spec Page: https://docs.oracle.com/javase/specs/jvms/se6/html/Instructions2.doc6.html#iconst
• Operation: Push int constant
• Format: iconst_<i>
• Forms: iconst_4 = 7 (0x7)
• Operand Stack: ... → ..., <i>
• Description: Push the int constant <i> (-1, 0, 1, 2, 3, 4 or 5) onto the operand stack
• Notes: Equivalent to bipush <i> except operand is implicit
• Category: 1 (int is a category-1 computational type per JVM Spec §2.11.1)

Closes #306

opencode session  |  github run