inst.rs 20.2 KB
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// Copyright 2017 The Australian National University
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

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use ir::*;
use ptr::*;
use types::*;
use op::*;
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use ir_semantics;
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use utils::vec_utils;
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use std::fmt;

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#[derive(Debug)]
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// this implements RustcEncodable, RustcDecodable, Clone and Display
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pub struct Instruction {
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    pub hdr: MuEntityHeader,
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    pub value : Option<Vec<P<Value>>>,
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    pub ops : Vec<P<TreeNode>>,
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    pub v: Instruction_
}

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impl_mu_entity!(Instruction);

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use rustc_serialize::{Encodable, Encoder, Decodable, Decoder};
impl Encodable for Instruction {
    fn encode<S: Encoder> (&self, s: &mut S) -> Result<(), S::Error> {
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        s.emit_struct("Instruction", 4, |s| {
            try!(s.emit_struct_field("hdr", 0, |s| self.hdr.encode(s)));
            try!(s.emit_struct_field("value", 1, |s| self.value.encode(s)));
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            let ref ops = self.ops;
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            try!(s.emit_struct_field("ops", 2, |s| ops.encode(s)));
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            try!(s.emit_struct_field("v", 3, |s| self.v.encode(s)));
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            Ok(()) 
        })        
    }
}

impl Decodable for Instruction {
    fn decode<D: Decoder>(d: &mut D) -> Result<Instruction, D::Error> {
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        d.read_struct("Instruction", 4, |d| {
            let hdr = try!(d.read_struct_field("hdr", 0, |d| Decodable::decode(d)));
            let value = try!(d.read_struct_field("value", 1, |d| Decodable::decode(d)));
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            let ops = try!(d.read_struct_field("ops", 2, |d| Decodable::decode(d)));
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            let v = try!(d.read_struct_field("v", 3, |d| Decodable::decode(d)));
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            Ok(Instruction{
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                hdr: hdr,
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                value: value,
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                ops: ops,
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                v: v
            })
        })
    }
}

impl Clone for Instruction {
    fn clone(&self) -> Self {
        Instruction {
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            hdr: self.hdr.clone(),
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            value: self.value.clone(),
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            ops: self.ops.clone(),
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            v: self.v.clone()
        }
    }
}

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impl Instruction {
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    pub fn clone_with_id(&self, new_id: MuID) -> Instruction {
        let mut clone = self.clone();
        clone.hdr = self.hdr.clone_with_id(new_id);

        clone
    }

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    pub fn has_exception_clause(&self) -> bool {
        ir_semantics::is_potentially_excepting_instruction(&self.v)
    }

    pub fn get_exception_target(&self) -> Option<MuID> {
        use inst::Instruction_::*;
        match self.v {
            Watchpoint {ref resume, ..}
            | Call {ref resume, ..}
            | CCall {ref resume, ..}
            | SwapStack {ref resume, ..}
            | ExnInstruction {ref resume, ..} => {
                Some(resume.exn_dest.target)
            },

            BinOp(_, _, _)
            | BinOpWithStatus(_, _, _, _)
            | CmpOp(_, _, _)
            | ConvOp{..}
            | ExprCall{..}
            | ExprCCall{..}
            | Load{..}
            | Store{..}
            | CmpXchg{..}
            | AtomicRMW{..}
            | New(_)
            | AllocA(_)
            | NewHybrid(_, _)
            | AllocAHybrid(_, _)
            | NewStack(_)
            | NewThread(_, _)
            | NewThreadExn(_, _)
            | NewFrameCursor(_)
            | GetIRef(_)
            | GetFieldIRef{..}
            | GetElementIRef{..}
            | ShiftIRef{..}
            | GetVarPartIRef{..}
            | Fence(_)
            | Return(_)
            | ThreadExit
            | Throw(_)
            | TailCall(_)
            | Branch1(_)
            | Branch2{..}
            | Select{..}
            | WPBranch{..}
            | Switch{..}
            | CommonInst_GetThreadLocal
            | CommonInst_SetThreadLocal(_)
            | CommonInst_Pin(_)
            | CommonInst_Unpin(_)
            | Move(_)
            | PrintHex(_) => None
        }
    }

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    fn debug_str(&self, ops: &Vec<P<TreeNode>>) -> String {
        self.v.debug_str(ops)
    }
}

impl fmt::Display for Instruction {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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        let ref ops = self.ops;
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        if self.value.is_some() {
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            write!(f, "{} = {}", vec_utils::as_str(self.value.as_ref().unwrap()), self.v.debug_str(ops))
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        } else {
            write!(f, "{}", self.v.debug_str(ops))
        }
    }
}

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#[allow(non_camel_case_types)]
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#[derive(Debug, Clone, RustcEncodable, RustcDecodable)]
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pub enum Instruction_ {
    // non-terminal instruction
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    // expressions
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    BinOp(BinOp, OpIndex, OpIndex),
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    BinOpWithStatus(BinOp, BinOpStatus, OpIndex, OpIndex),

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    CmpOp(CmpOp, OpIndex, OpIndex),
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    ConvOp{
        operation: ConvOp,
        from_ty: P<MuType>,
        to_ty: P<MuType>,
        operand: OpIndex
    },
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    // yields a tuple of results from the call
    ExprCall{
        data: CallData,
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        is_abort: bool, // T to abort, F to rethrow - FIXME: current, always rethrow for now
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    },
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    ExprCCall{
        data: CallData,
        is_abort: bool
    },

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    // yields the memory value
    Load{
        is_ptr: bool,
        order: MemoryOrder,
        mem_loc: OpIndex
    },
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    // yields nothing
    Store{
        is_ptr: bool,
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        order: MemoryOrder,
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        mem_loc: OpIndex,
        value: OpIndex
    },
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    // yields pair (oldvalue, boolean (T = success, F = failure))
    CmpXchg{
        is_ptr: bool,
        is_weak: bool,
        success_order: MemoryOrder,
        fail_order: MemoryOrder,
        mem_loc: OpIndex,
        expected_value: OpIndex,
        desired_value: OpIndex
    },
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    // yields old memory value
    AtomicRMW{
        is_ptr: bool, // T for iref, F for ptr
        order: MemoryOrder,
        op: AtomicRMWOp,
        mem_loc: OpIndex,
        value: OpIndex // operand for op
    },
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    // yields a reference of the type
    New(P<MuType>),
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    // yields an iref of the type
    AllocA(P<MuType>),
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    // yields ref
    NewHybrid(P<MuType>, OpIndex),
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    // yields iref
    AllocAHybrid(P<MuType>, OpIndex),
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    // yields stack ref
    NewStack(OpIndex), // func
                           // TODO: common inst
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    // yields thread reference
    NewThread(OpIndex, Vec<OpIndex>), // stack, args
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    // yields thread reference (thread resumes with exceptional value)
    NewThreadExn(OpIndex, OpIndex), // stack, exception
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    // yields frame cursor
    NewFrameCursor(OpIndex), // stack
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    // ref<T> -> iref<T>
    GetIRef(OpIndex),
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    // iref|uptr<struct|hybrid<T>> int<M> -> iref|uptr<U>
    GetFieldIRef{
        is_ptr: bool,
        base: OpIndex, // iref or uptr
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        index: usize // constant
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    },
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    // iref|uptr<array<T N>> int<M> -> iref|uptr<T>
    GetElementIRef{
        is_ptr: bool,
        base: OpIndex,
        index: OpIndex // can be constant or ssa var
    },
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    // iref|uptr<T> int<M> -> iref|uptr<T>
    ShiftIRef{
        is_ptr: bool,
        base: OpIndex,
        offset: OpIndex
    },
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    // iref|uptr<hybrid<T U>> -> iref|uptr<U>
    GetVarPartIRef{
        is_ptr: bool,
        base: OpIndex
    },
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//    PushFrame{
//        stack: P<Value>,
//        func: P<Value>
//    },
//    PopFrame{
//        stack: P<Value>
//    }

    Fence(MemoryOrder),
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    // terminal instruction
    Return(Vec<OpIndex>),
    ThreadExit, // TODO:  common inst
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    Throw(OpIndex),
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    TailCall(CallData),
    Branch1(Destination),
    Branch2{
        cond: OpIndex,
        true_dest: Destination,
        false_dest: Destination,
        true_prob: f32
    },
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    Select{
        cond: OpIndex,
        true_val: OpIndex,
        false_val: OpIndex
    },
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    Watchpoint{ // Watchpoint NONE ResumptionData
                //   serves as an unconditional trap. Trap to client, and resume with ResumptionData
                // Watchpoint (WPID dest) ResumptionData
                //   when disabled, jump to dest
                //   when enabled, trap to client and resume
        id: Option<WPID>,
        disable_dest: Option<Destination>,
        resume: ResumptionData
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    },
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    WPBranch{
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        wp: WPID,
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        disable_dest: Destination,
        enable_dest: Destination
    },
    Call{
        data: CallData,
        resume: ResumptionData
    },
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    CCall{
        data: CallData,
        resume: ResumptionData
    },
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    SwapStack{
        stack: OpIndex,
        is_exception: bool,
        args: Vec<OpIndex>,
        resume: ResumptionData
    },
    Switch{
        cond: OpIndex,
        default: Destination,
        branches: Vec<(OpIndex, Destination)>
    },
    ExnInstruction{
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        inner: Box<Instruction>,
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        resume: ResumptionData
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    },

    // common inst
    CommonInst_GetThreadLocal,
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    CommonInst_SetThreadLocal(OpIndex),

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    // pin/unpin
    CommonInst_Pin  (OpIndex),
    CommonInst_Unpin(OpIndex),

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    // internal use: mov from ops[0] to value
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    Move(OpIndex),
    // internal use: print op as hex value
    PrintHex(OpIndex)
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}

impl Instruction_ {
    fn debug_str(&self, ops: &Vec<P<TreeNode>>) -> String {
        match self {
            &Instruction_::BinOp(op, op1, op2) => format!("{:?} {} {}", op, ops[op1], ops[op2]),
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            &Instruction_::BinOpWithStatus(op, status, op1, op2) => {
                format!("{:?} {:?} {} {}", op, status, ops[op1], ops[op2])
            }
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            &Instruction_::CmpOp(op, op1, op2) => format!("{:?} {} {}", op, ops[op1], ops[op2]),
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            &Instruction_::ConvOp{operation, ref from_ty, ref to_ty, operand} => {
                format!("{:?} {} {} {}", operation, from_ty, to_ty, ops[operand])
            }
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            &Instruction_::ExprCall{ref data, is_abort} => {
                let abort = select_value!(is_abort, "ABORT_ON_EXN", "RETHROW");
                format!("CALL {} {}", data.debug_str(ops), abort)
            },
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            &Instruction_::ExprCCall{ref data, is_abort} => {
                let abort = select_value!(is_abort, "ABORT_ON_EXN", "RETHROW");
                format!("CCALL {} {}", data.debug_str(ops), abort)
            }
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            &Instruction_::Load{is_ptr, mem_loc, order} => {
                let ptr = select_value!(is_ptr, "PTR", "");
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                format!("LOAD {} {:?} {}", ptr, order, ops[mem_loc])
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            },
            &Instruction_::Store{value, is_ptr, mem_loc, order} => {
                let ptr = select_value!(is_ptr, "PTR", "");
                format!("STORE {} {:?} {} {}", ptr, order, ops[mem_loc], ops[value])
            },
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            &Instruction_::CmpXchg{is_ptr, is_weak, success_order, fail_order,
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                mem_loc, expected_value, desired_value} => {
                let ptr = select_value!(is_ptr, "PTR", "");
                let weak = select_value!(is_weak, "WEAK", "");
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                format!("CMPXCHG {} {} {:?} {:?} {} {} {}",
                    ptr, weak, success_order, fail_order, ops[mem_loc], ops[expected_value], ops[desired_value])
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            },
            &Instruction_::AtomicRMW{is_ptr, order, op, mem_loc, value} => {
                let ptr = select_value!(is_ptr, "PTR", "");
                format!("ATOMICRMW {} {:?} {:?} {} {}", ptr, order, op, ops[mem_loc], ops[value])
            },
            &Instruction_::New(ref ty) => format!("NEW {}", ty),
            &Instruction_::AllocA(ref ty) => format!("ALLOCA {}", ty),
            &Instruction_::NewHybrid(ref ty, len) => format!("NEWHYBRID {} {}", ty, ops[len]),
            &Instruction_::AllocAHybrid(ref ty, len) => format!("ALLOCAHYBRID {} {}", ty, ops[len]),
            &Instruction_::NewStack(func) => format!("NEWSTACK {}", ops[func]),
            &Instruction_::NewThread(stack, ref args) => format!("NEWTHREAD {} PASS_VALUES {}", ops[stack], op_vector_str(args, ops)),
            &Instruction_::NewThreadExn(stack, exn) => format!("NEWTHREAD {} THROW_EXC {}", ops[stack], ops[exn]),
            &Instruction_::NewFrameCursor(stack) => format!("NEWFRAMECURSOR {}", ops[stack]),
            &Instruction_::GetIRef(reference) => format!("GETIREF {}", ops[reference]),
            &Instruction_::GetFieldIRef{is_ptr, base, index} => {
                let ptr = select_value!(is_ptr, "PTR", "");
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                format!("GETFIELDIREF {} {} {}", ptr, ops[base], index)
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            },
            &Instruction_::GetElementIRef{is_ptr, base, index} => {
                let ptr = select_value!(is_ptr, "PTR", "");
                format!("GETELEMENTIREF {} {} {}", ptr, ops[base], ops[index])
            },
            &Instruction_::ShiftIRef{is_ptr, base, offset} => {
                let ptr = select_value!(is_ptr, "PTR", "");
                format!("SHIFTIREF {} {} {}", ptr, ops[base], ops[offset])
            },
            &Instruction_::GetVarPartIRef{is_ptr, base} => {
                let ptr = select_value!(is_ptr, "PTR", "");
                format!("GETVARPARTIREF {} {}", ptr, ops[base])
            },
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            &Instruction_::Fence(order) => {
                format!("FENCE {:?}", order)
            },
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            &Instruction_::Return(ref vals) => format!("RET {}", op_vector_str(vals, ops)),
            &Instruction_::ThreadExit => "THREADEXIT".to_string(),
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            &Instruction_::Throw(exn_obj) => format!("THROW {}", ops[exn_obj]),
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            &Instruction_::TailCall(ref call) => format!("TAILCALL {}", call.debug_str(ops)),
            &Instruction_::Branch1(ref dest) => format!("BRANCH {}", dest.debug_str(ops)),
            &Instruction_::Branch2{cond, ref true_dest, ref false_dest, ..} => {
                format!("BRANCH2 {} {} {}", ops[cond], true_dest.debug_str(ops), false_dest.debug_str(ops))
            },
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            &Instruction_::Select{cond, true_val, false_val} => {
                format!("SELECT if {} then {} else {}", ops[cond], ops[true_val], ops[false_val])
            }
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            &Instruction_::Watchpoint{id, ref disable_dest, ref resume} => {
                match id {
                    Some(id) => {
                        format!("WATCHPOINT {} {} {}", id, disable_dest.as_ref().unwrap().debug_str(ops), resume.debug_str(ops))
                    },
                    None => {
                        format!("TRAP {}", resume.debug_str(ops))
                    }
                }
            },
            &Instruction_::WPBranch{wp, ref disable_dest, ref enable_dest} => {
                format!("WPBRANCH {} {} {}", wp, disable_dest.debug_str(ops), enable_dest.debug_str(ops))
            },
            &Instruction_::Call{ref data, ref resume} => format!("CALL {} {}", data.debug_str(ops), resume.debug_str(ops)),
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            &Instruction_::CCall{ref data, ref resume} => format!("CCALL {} {}", data.debug_str(ops), resume.debug_str(ops)),
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            &Instruction_::SwapStack{stack, is_exception, ref args, ref resume} => {
                format!("SWAPSTACK {} {} {} {}", ops[stack], is_exception, op_vector_str(args, ops), resume.debug_str(ops))
            },
            &Instruction_::Switch{cond, ref default, ref branches} => {
                let mut ret = format!("SWITCH {} {} {{", ops[cond], default.debug_str(ops));
                for i in 0..branches.len() {
                    let (op, ref dest) = branches[i];
                    ret.push_str(format!("{} {}", ops[op], dest.debug_str(ops)).as_str());
                    if i != branches.len() - 1 {
                        ret.push_str(", ");
                    }
                }
                ret.push_str("}}");
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                ret
            },
            &Instruction_::ExnInstruction{ref inner, ref resume} => {
                format!("{} {}", inner.debug_str(ops), resume.debug_str(ops))
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            },
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            // common inst
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            &Instruction_::CommonInst_GetThreadLocal => format!("COMMONINST GetThreadLocal"),
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            &Instruction_::CommonInst_SetThreadLocal(op) => format!("COMMONINST SetThreadLocal {}", ops[op]),

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            &Instruction_::CommonInst_Pin(op)   => format!("COMMONINST Pin {}",   ops[op]),
            &Instruction_::CommonInst_Unpin(op) => format!("COMMONINST Unpin {}", ops[op]),

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            // move
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            &Instruction_::Move(from) => format!("MOVE {}", ops[from]),
            // print hex
            &Instruction_::PrintHex(i) => format!("PRINTHEX {}", ops[i])
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        }
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    }
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}

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#[derive(Copy, Clone, RustcEncodable, RustcDecodable)]
pub struct BinOpStatus {
    pub flag_n: bool,
    pub flag_z: bool,
    pub flag_c: bool,
    pub flag_v: bool
}

impl BinOpStatus {
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    pub fn none() -> BinOpStatus {
        BinOpStatus {flag_n: false, flag_z: false, flag_c: false, flag_v: false}
    }

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    pub fn n() -> BinOpStatus {
        BinOpStatus {flag_n: true, flag_z: false, flag_c: false, flag_v: false}
    }

    pub fn z() -> BinOpStatus {
        BinOpStatus {flag_n: false, flag_z: true, flag_c: false, flag_v: false}
    }

    pub fn c() -> BinOpStatus {
        BinOpStatus {flag_n: false, flag_z: false, flag_c: true, flag_v: false}
    }

    pub fn v() -> BinOpStatus {
        BinOpStatus {flag_n: false, flag_z: false, flag_c: false, flag_v: true}
    }
}

impl fmt::Debug for BinOpStatus {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        if self.flag_n {
            write!(f, "#N").unwrap();
        }
        if self.flag_z {
            write!(f, "#Z").unwrap();
        }
        if self.flag_c {
            write!(f, "#C").unwrap();
        }
        if self.flag_v {
            write!(f, "#V").unwrap();
        }
        Ok(())
    }
}

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#[derive(Copy, Clone, Debug, RustcEncodable, RustcDecodable)]
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pub enum MemoryOrder {
    NotAtomic,
    Relaxed,
    Consume,
    Acquire,
    Release,
    AcqRel,
    SeqCst
}

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#[derive(Copy, Clone, Debug, RustcEncodable, RustcDecodable)]
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pub enum CallConvention {
    Mu,
    Foreign(ForeignFFI)
}

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#[derive(Copy, Clone, Debug, RustcEncodable, RustcDecodable)]
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pub enum ForeignFFI {
    C
}

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#[derive(Clone, Debug, RustcEncodable, RustcDecodable)]
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pub struct CallData {
    pub func: OpIndex,
    pub args: Vec<OpIndex>,
    pub convention: CallConvention
}

impl CallData {
    fn debug_str(&self, ops: &Vec<P<TreeNode>>) -> String {
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        let func_name = match ops[self.func].name() {
            Some(name) => name,
            None => "Anonymous Function".to_string()
        };
        format!("{:?} {} [{}]", self.convention, func_name, op_vector_str(&self.args, ops))
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    }
}

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#[derive(Clone, Debug, RustcEncodable, RustcDecodable)]
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pub struct ResumptionData {
    pub normal_dest: Destination,
    pub exn_dest: Destination
}

impl ResumptionData {
    fn debug_str(&self, ops: &Vec<P<TreeNode>>) -> String {
        format!("normal: {}, exception: {}", self.normal_dest.debug_str(ops), self.exn_dest.debug_str(ops))
    }
}

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#[derive(Clone, Debug, RustcEncodable, RustcDecodable)]
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pub struct Destination {
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    pub target: MuID,
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    pub args: Vec<DestArg>
}

impl Destination {
    fn debug_str(&self, ops: &Vec<P<TreeNode>>) -> String {
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        let mut ret = format!("{}", self.target);
        ret.push('(');
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        for i in 0..self.args.len() {
            let ref arg = self.args[i];
            ret.push_str(arg.debug_str(ops).as_str());
            if i != self.args.len() - 1 {
                ret.push_str(", ");
            }
        }
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        ret.push(')');
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        ret
    }
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    pub fn get_arguments_as_node(&self, ops: &Vec<P<TreeNode>>) -> Vec<P<TreeNode>> {
       vec_utils::map(&self.args,
           |x| {
               match x {
                   &DestArg::Normal(i) => ops[i].clone(),
                   &DestArg::Freshbound(_) => unimplemented!()
               }
       })
    }

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    pub fn get_arguments(&self, ops: &Vec<P<TreeNode>>) -> Vec<P<Value>> {
        vec_utils::map(&self.args, 
            |x| {
                match x {
                    &DestArg::Normal(i) => ops[i].clone_value(),
                    &DestArg::Freshbound(_) => unimplemented!()
                }
        })
    }
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}

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#[derive(Clone, Debug, RustcEncodable, RustcDecodable)]
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pub enum DestArg {
    Normal(OpIndex),
    Freshbound(usize)
}

impl DestArg {
    fn debug_str(&self, ops: &Vec<P<TreeNode>>) -> String {
        match self {
            &DestArg::Normal(index) => format!("{}", ops[index]),
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            &DestArg::Freshbound(n) => format!("${}", n)
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        }
    }
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}