use serde::{Deserialize, Serialize};
use super::ids::{ConstId, FunctionId, TypeId, ValueId};

/// Instructions within a basic block.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum Instr {
    /// Placeholder for constant loading.
    PushConst(ConstId),
    /// Placeholder for function calls.
    Call(FunctionId, u32),
    /// Host calls (syscalls).
    HostCall(u32),
    /// Variable access.
    GetLocal(u32),
    SetLocal(u32),
    /// Stack operations.
    Pop,
    Dup,
    /// Arithmetic.
    Add,
    Sub,
    Mul,
    Div,
    Neg,
    /// Logical/Comparison.
    Eq,
    Neq,
    Lt,
    Lte,
    Gt,
    Gte,
    And,
    Or,
    Not,
    /// HIP operations.
    Alloc { ty: TypeId, slots: u32 },
    BeginPeek { gate: ValueId },
    BeginBorrow { gate: ValueId },
    BeginMutate { gate: ValueId },
    EndPeek,
    EndBorrow,
    EndMutate,
    /// Reads from heap at reference + offset. Pops reference, pushes value.
    LoadRef(u32),
    /// Writes to heap at reference + offset. Pops reference and value.
    StoreRef(u32),
    Free,
}