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fix incorrect impl of RDI_EvalOp_Swap

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Ryan Fleury
2026-06-09 16:02:30 -07:00
parent be8ed940bd
commit c05846aef1
1 changed files with 15 additions and 8 deletions
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src/eval/eval_interpret.c
+11 -4
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@@ -1020,23 +1020,30 @@ e_interpret(String8 bytecode)
// we do not assemble composites; for single-piece expressions the // we do not assemble composites; for single-piece expressions the
// value already on the stack is the result. for multi-piece, only // value already on the stack is the result. for multi-piece, only
// the first piece is returned (stack[0] is the final result). // the first piece is returned (stack[0] is the final result).
result.code = E_InterpretationCode_BadOp;
goto done;
}break; }break;
case RDI_EvalOp_PartialValueBit: case RDI_EvalOp_PartialValueBit:
{ {
// DW_OP_bit_piece marker. same caveat as PartialValue. // DW_OP_bit_piece marker. same caveat as PartialValue.
result.code = E_InterpretationCode_BadOp;
goto done;
}break; }break;
case RDI_EvalOp_Swap: case RDI_EvalOp_Swap:
{ {
if(stack_count + 2 > stack_cap) if(stack_count >= 2)
{
E_Value swap = stack[stack_count-2];
stack[stack_count-2] = stack[stack_count-1];
stack[stack_count-1] = swap;
}
else
{ {
result.code = E_InterpretationCode_InsufficientStackSpace; result.code = E_InterpretationCode_InsufficientStackSpace;
goto done; goto done;
} }
stack[stack_count + 0] = svals[1];
stack[stack_count + 1] = svals[0];
stack_count += 2;
}break; }break;
case RDI_EvalOp_PushCfa: case RDI_EvalOp_PushCfa: