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Step 6: support map spread in bytecode

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sergeych committed 2026-02-09 01:43:58 +03:00
1 parent 026b023892
commit 3a46e59ec8
2 files changed
+31 -3
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lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/BytecodeCompiler.kt
+29 -1
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@@ -529,7 +529,35 @@ class BytecodeCompiler(
builder.emit(Opcode.SET_INDEX, dst, keySlot, value.slot)
}
is net.sergeych.lyng.obj.MapLiteralEntry.Spread -> {
throw BytecodeCompileException("Map spread is not supported in bytecode", Pos.builtIn)
if (entry.ref is ListLiteralRef) {
throw BytecodeCompileException(
"spread element in map literal must be a Map",
Pos.builtIn
)
}
val value = compileRefWithFallback(entry.ref, null, Pos.builtIn) ?: return null
val mapClassId = builder.addConst(BytecodeConst.ObjRef(ObjMap.type))
val mapClassSlot = allocSlot()
builder.emit(Opcode.CONST_OBJ, mapClassId, mapClassSlot)
val checkSlot = allocSlot()
builder.emit(Opcode.CHECK_IS, value.slot, mapClassSlot, checkSlot)
val okLabel = builder.label()
val endLabel = builder.label()
builder.emit(
Opcode.JMP_IF_TRUE,
listOf(CmdBuilder.Operand.IntVal(checkSlot), CmdBuilder.Operand.LabelRef(okLabel))
)
val msgId = builder.addConst(BytecodeConst.StringVal("spread element in map literal must be a Map"))
val msgSlot = allocSlot()
builder.emit(Opcode.CONST_OBJ, msgId, msgSlot)
val posId = builder.addConst(BytecodeConst.PosVal(Pos.builtIn))
builder.emit(Opcode.THROW, posId, msgSlot)
builder.emit(Opcode.JMP, listOf(CmdBuilder.Operand.LabelRef(endLabel)))
builder.mark(okLabel)
val mergedSlot = allocSlot()
builder.emit(Opcode.ADD_OBJ, dst, value.slot, mergedSlot)
builder.emit(Opcode.MOVE_OBJ, mergedSlot, dst)
builder.mark(endLabel)
}
}
}