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141 lines
5.0 KiB
141 lines
5.0 KiB
use std::ops::Rem;
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use num_traits::PrimInt;
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use crate::asm::instr::op::{OpTrait, EvalRes};
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use crate::runtime::fault::Fault;
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use crate::runtime::frame::{CallStack, StackFrame};
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use crate::runtime::program::Program;
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use crate::builtin::defs::BuiltinOp;
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use crate::asm::data::literal::Addr;
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impl OpTrait for BuiltinOp {
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fn execute(&self, program: &Program, call_stack: &mut CallStack, frame: &mut StackFrame) -> Result<EvalRes, Fault> {
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let mut res = EvalRes::default();
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match self {
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BuiltinOp::Nop => {}
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BuiltinOp::Label(_) | BuiltinOp::FarLabel(_) | BuiltinOp::Routine(_) => {
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/* this is nop, but without any cost - just markers */
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res.cycles = 0;
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}
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BuiltinOp::Barrier(msg) => {
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return Err(Fault::Barrier {
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msg: msg.clone().unwrap_or_else(|| "BARRIER".into())
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});
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}
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BuiltinOp::Fault(msg) => {
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return Err(Fault::FaultInstr {
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msg: msg.clone().unwrap_or_else(|| "FAULT".into())
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});
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}
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BuiltinOp::FarJump(name) => {
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match program.find_far_label(name) {
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Ok(pos) => {
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frame.pc = pos;
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}
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Err(e) => {
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return Err(e);
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}
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}
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}
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BuiltinOp::Jump(name) => {
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match program.find_local_label(frame.pc, name) {
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Ok(pos) => {
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frame.pc = pos;
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}
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Err(e) => {
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return Err(e);
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}
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}
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}
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BuiltinOp::JumpIf(cond, name) => {
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if frame.status.test(*cond) {
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match program.find_local_label(frame.pc, name) {
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Ok(pos) => {
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frame.pc = pos;
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}
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Err(e) => {
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return Err(e);
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}
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}
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}
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}
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BuiltinOp::FarJumpIf(cond, name) => {
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if frame.status.test(*cond) {
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match program.find_far_label(name) {
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Ok(pos) => {
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frame.pc = pos;
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}
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Err(e) => {
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return Err(e);
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}
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}
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}
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}
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BuiltinOp::Call(name, args) => {
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match program.find_routine(&name) {
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Ok(pos) => {
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let mut values = Vec::with_capacity(args.len());
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for arg in args {
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values.push(frame.read(*arg)?);
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}
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let mut frame2 = StackFrame::new(pos, &values);
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std::mem::swap(frame, &mut frame2);
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call_stack.push(frame2);
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res.advance = 0;
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}
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Err(e) => {
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return Err(e);
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}
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}
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}
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BuiltinOp::Ret(retvals) => {
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match call_stack.pop() {
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Some(previous) => {
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let mut values = Vec::with_capacity(retvals.len());
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for arg in retvals {
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values.push(frame.read(*arg)?);
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}
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*frame = previous;
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frame.set_retvals(&values);
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}
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None => {
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return Err(Fault::CallStackUnderflow);
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}
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}
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}
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BuiltinOp::Skip(val) => {
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let steps = frame.read(*val)?;
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res.advance = i64::from_ne_bytes(steps.to_ne_bytes());
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program.validate_jump(frame.pc, Addr((frame.pc.0 as i64 + res.advance) as u64))?;
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}
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BuiltinOp::SkipIf(cond, val) => {
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if frame.status.test(*cond) {
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debug!("Skipping");
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let steps = frame.read(*val)?;
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res.advance = i64::from_ne_bytes(steps.to_ne_bytes());
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program.validate_jump(frame.pc, Addr((frame.pc.0 as i64 + res.advance) as u64))?;
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}
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}
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BuiltinOp::Move { dst, src } => {
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frame.status.clear();
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let val = frame.read(*src)?;
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frame.status.update(val);
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frame.write(*dst, val)?;
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}
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BuiltinOp::StoreStatus { dst } => {
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let packed = frame.status.store();
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frame.write(*dst, packed)?;
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}
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BuiltinOp::LoadStatus { src } => {
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let x = frame.read(*src)?;
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frame.status.load(x);
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}
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}
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Ok(res)
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}
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//
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}
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