2016-03-04 23:17:31 -06:00
|
|
|
use rustc::middle::const_eval;
|
2016-03-13 18:19:42 -05:00
|
|
|
use rustc::middle::def_id::DefId;
|
2016-03-15 01:45:25 -05:00
|
|
|
use rustc::middle::subst::{self, Subst, Substs};
|
2016-03-14 22:48:00 -05:00
|
|
|
use rustc::middle::ty::{self, TyCtxt};
|
2016-02-18 19:06:22 -06:00
|
|
|
use rustc::mir::mir_map::MirMap;
|
2016-03-07 10:14:47 -06:00
|
|
|
use rustc::mir::repr as mir;
|
2016-03-13 18:19:42 -05:00
|
|
|
use rustc::util::nodemap::DefIdMap;
|
|
|
|
use std::cell::RefCell;
|
|
|
|
use std::ops::Deref;
|
|
|
|
use std::rc::Rc;
|
2015-11-12 15:50:58 -06:00
|
|
|
|
2016-03-14 22:48:00 -05:00
|
|
|
use error::EvalResult;
|
2016-03-14 23:05:50 -05:00
|
|
|
use memory::{self, FieldRepr, Memory, Pointer, Repr};
|
2016-03-13 07:05:48 -05:00
|
|
|
use primval::{self, PrimVal};
|
2016-03-05 00:23:37 -06:00
|
|
|
|
2016-03-05 00:48:23 -06:00
|
|
|
const TRACE_EXECUTION: bool = true;
|
2016-02-27 19:20:25 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
struct Interpreter<'a, 'tcx: 'a> {
|
|
|
|
/// The results of the type checker, from rustc.
|
|
|
|
tcx: &'a TyCtxt<'tcx>,
|
|
|
|
|
|
|
|
/// A mapping from NodeIds to Mir, from rustc. Only contains MIR for crate-local items.
|
|
|
|
mir_map: &'a MirMap<'tcx>,
|
|
|
|
|
|
|
|
/// A local cache from DefIds to Mir for non-crate-local items.
|
|
|
|
mir_cache: RefCell<DefIdMap<Rc<mir::Mir<'tcx>>>>,
|
|
|
|
|
|
|
|
/// The virtual memory system.
|
|
|
|
memory: Memory,
|
|
|
|
|
|
|
|
/// The virtual call stack.
|
|
|
|
stack: Vec<Frame<'a, 'tcx>>,
|
|
|
|
|
2016-03-14 22:48:00 -05:00
|
|
|
/// Another stack containing the type substitutions for the current function invocation. It
|
|
|
|
/// exists separately from `stack` because it must contain the `Substs` for a function while
|
2016-03-14 22:18:39 -05:00
|
|
|
/// *creating* the `Frame` for that same function.
|
|
|
|
substs_stack: Vec<&'tcx Substs<'tcx>>,
|
|
|
|
}
|
|
|
|
|
2016-03-06 04:23:24 -06:00
|
|
|
/// A stack frame.
|
2016-03-07 07:10:52 -06:00
|
|
|
struct Frame<'a, 'tcx: 'a> {
|
2016-03-13 15:46:24 -05:00
|
|
|
/// The MIR for the function called on this frame.
|
2016-03-13 18:19:42 -05:00
|
|
|
mir: CachedMir<'a, 'tcx>,
|
2016-03-07 07:10:52 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
/// The block this frame will execute when a function call returns back to this frame.
|
2016-03-14 21:39:51 -05:00
|
|
|
next_block: mir::BasicBlock,
|
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
/// A pointer for writing the return value of the current call if it's not a diverging call.
|
2016-03-06 04:23:24 -06:00
|
|
|
return_ptr: Option<Pointer>,
|
2016-02-27 19:20:25 -06:00
|
|
|
|
2016-03-06 04:23:24 -06:00
|
|
|
/// The list of locals for the current function, stored in order as
|
|
|
|
/// `[arguments..., variables..., temporaries...]`. The variables begin at `self.var_offset`
|
|
|
|
/// and the temporaries at `self.temp_offset`.
|
|
|
|
locals: Vec<Pointer>,
|
2016-02-27 19:20:25 -06:00
|
|
|
|
2016-03-06 04:23:24 -06:00
|
|
|
/// The offset of the first variable in `self.locals`.
|
|
|
|
var_offset: usize,
|
2016-02-27 19:20:25 -06:00
|
|
|
|
2016-03-06 04:23:24 -06:00
|
|
|
/// The offset of the first temporary in `self.locals`.
|
|
|
|
temp_offset: usize,
|
|
|
|
}
|
2016-02-27 19:20:25 -06:00
|
|
|
|
2016-03-14 22:48:00 -05:00
|
|
|
#[derive(Clone)]
|
|
|
|
enum CachedMir<'mir, 'tcx: 'mir> {
|
|
|
|
Ref(&'mir mir::Mir<'tcx>),
|
|
|
|
Owned(Rc<mir::Mir<'tcx>>)
|
|
|
|
}
|
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
/// Represents the action to be taken in the main loop as a result of executing a terminator.
|
|
|
|
enum TerminatorTarget {
|
|
|
|
/// Make a local jump to the given block.
|
|
|
|
Block(mir::BasicBlock),
|
2016-03-06 04:23:24 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
/// Start executing from the new current frame. (For function calls.)
|
|
|
|
Call,
|
2015-11-19 07:07:47 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
/// Stop executing the current frame and resume the previous frame.
|
|
|
|
Return,
|
2015-11-16 15:22:27 -06:00
|
|
|
}
|
|
|
|
|
2016-03-07 07:10:52 -06:00
|
|
|
impl<'a, 'tcx: 'a> Interpreter<'a, 'tcx> {
|
2016-03-04 23:17:31 -06:00
|
|
|
fn new(tcx: &'a TyCtxt<'tcx>, mir_map: &'a MirMap<'tcx>) -> Self {
|
2015-11-12 15:50:58 -06:00
|
|
|
Interpreter {
|
2015-11-19 07:07:47 -06:00
|
|
|
tcx: tcx,
|
|
|
|
mir_map: mir_map,
|
2016-03-13 18:19:42 -05:00
|
|
|
mir_cache: RefCell::new(DefIdMap()),
|
2016-03-07 10:14:47 -06:00
|
|
|
memory: Memory::new(),
|
2016-03-06 04:23:24 -06:00
|
|
|
stack: Vec::new(),
|
2016-03-14 21:39:51 -05:00
|
|
|
substs_stack: Vec::new(),
|
2016-03-06 04:23:24 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-14 22:48:00 -05:00
|
|
|
fn run(&mut self) -> EvalResult<()> {
|
|
|
|
use std::fmt::Debug;
|
|
|
|
fn print_trace<T: Debug>(t: &T, suffix: &'static str, indent: usize) {
|
|
|
|
if !TRACE_EXECUTION { return; }
|
|
|
|
for _ in 0..indent { print!(" "); }
|
|
|
|
println!("{:?}{}", t, suffix);
|
|
|
|
}
|
|
|
|
|
|
|
|
'outer: while !self.stack.is_empty() {
|
|
|
|
let mut current_block = self.current_frame().next_block;
|
|
|
|
|
|
|
|
loop {
|
|
|
|
print_trace(¤t_block, ":", self.stack.len());
|
|
|
|
let current_mir = self.current_frame().mir.clone(); // Cloning a reference.
|
|
|
|
let block_data = current_mir.basic_block_data(current_block);
|
|
|
|
|
|
|
|
for stmt in &block_data.statements {
|
|
|
|
print_trace(stmt, "", self.stack.len() + 1);
|
|
|
|
let mir::StatementKind::Assign(ref lvalue, ref rvalue) = stmt.kind;
|
|
|
|
try!(self.eval_assignment(lvalue, rvalue));
|
|
|
|
}
|
|
|
|
|
|
|
|
let terminator = block_data.terminator();
|
|
|
|
print_trace(terminator, "", self.stack.len() + 1);
|
|
|
|
|
|
|
|
match try!(self.eval_terminator(terminator)) {
|
|
|
|
TerminatorTarget::Block(block) => current_block = block,
|
|
|
|
TerminatorTarget::Return => {
|
|
|
|
self.pop_stack_frame();
|
|
|
|
self.substs_stack.pop();
|
|
|
|
continue 'outer;
|
|
|
|
}
|
|
|
|
TerminatorTarget::Call => continue 'outer,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2016-03-13 18:19:42 -05:00
|
|
|
fn push_stack_frame(&mut self, mir: CachedMir<'a, 'tcx>, args: &[mir::Operand<'tcx>],
|
2016-03-07 07:10:52 -06:00
|
|
|
return_ptr: Option<Pointer>) -> EvalResult<()> {
|
2016-03-06 04:23:24 -06:00
|
|
|
let num_args = mir.arg_decls.len();
|
|
|
|
let num_vars = mir.var_decls.len();
|
2016-03-07 07:10:52 -06:00
|
|
|
let num_temps = mir.temp_decls.len();
|
2016-03-06 04:23:24 -06:00
|
|
|
assert_eq!(args.len(), num_args);
|
|
|
|
|
2016-03-07 07:10:52 -06:00
|
|
|
let mut locals = Vec::with_capacity(num_args + num_vars + num_temps);
|
2016-03-06 04:23:24 -06:00
|
|
|
|
2016-03-07 07:10:52 -06:00
|
|
|
for (arg_decl, arg_operand) in mir.arg_decls.iter().zip(args) {
|
2016-03-11 21:27:54 -06:00
|
|
|
let repr = self.ty_to_repr(arg_decl.ty);
|
2016-03-07 07:19:43 -06:00
|
|
|
let dest = self.memory.allocate(repr.size());
|
2016-03-13 01:14:20 -06:00
|
|
|
let (src, _) = try!(self.eval_operand(arg_operand));
|
2016-03-07 07:10:52 -06:00
|
|
|
try!(self.memory.copy(src, dest, repr.size()));
|
|
|
|
locals.push(dest);
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
2016-03-06 04:23:24 -06:00
|
|
|
|
2016-03-07 07:10:52 -06:00
|
|
|
let var_tys = mir.var_decls.iter().map(|v| v.ty);
|
|
|
|
let temp_tys = mir.temp_decls.iter().map(|t| t.ty);
|
2016-03-07 07:19:43 -06:00
|
|
|
locals.extend(var_tys.chain(temp_tys).map(|ty| {
|
2016-03-11 21:27:54 -06:00
|
|
|
let repr = self.ty_to_repr(ty).size();
|
|
|
|
self.memory.allocate(repr)
|
2016-03-07 07:19:43 -06:00
|
|
|
}));
|
2016-03-07 07:10:52 -06:00
|
|
|
|
|
|
|
self.stack.push(Frame {
|
2016-03-13 18:19:42 -05:00
|
|
|
mir: mir.clone(),
|
2016-03-14 21:39:51 -05:00
|
|
|
next_block: mir::START_BLOCK,
|
2016-03-06 04:23:24 -06:00
|
|
|
return_ptr: return_ptr,
|
|
|
|
locals: locals,
|
|
|
|
var_offset: num_args,
|
|
|
|
temp_offset: num_args + num_vars,
|
|
|
|
});
|
|
|
|
|
|
|
|
Ok(())
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
|
|
|
|
2016-03-06 04:23:24 -06:00
|
|
|
fn pop_stack_frame(&mut self) {
|
|
|
|
let _frame = self.stack.pop().expect("tried to pop a stack frame, but there were none");
|
|
|
|
// TODO(tsion): Deallocate local variables.
|
|
|
|
}
|
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
fn eval_terminator(&mut self, terminator: &mir::Terminator<'tcx>) -> EvalResult<TerminatorTarget> {
|
|
|
|
use rustc::mir::repr::Terminator::*;
|
|
|
|
let target = match *terminator {
|
|
|
|
Return => TerminatorTarget::Return,
|
2015-11-19 03:23:50 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
Goto { target } => TerminatorTarget::Block(target),
|
2016-03-07 08:22:18 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
If { ref cond, targets: (then_target, else_target) } => {
|
|
|
|
let (cond_ptr, _) = try!(self.eval_operand(cond));
|
|
|
|
let cond_val = try!(self.memory.read_bool(cond_ptr));
|
|
|
|
TerminatorTarget::Block(if cond_val { then_target } else { else_target })
|
|
|
|
}
|
2016-03-07 08:22:18 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
SwitchInt { ref discr, ref values, ref targets, .. } => {
|
2016-03-15 08:13:31 -05:00
|
|
|
let discr_ptr = try!(self.eval_lvalue(discr));
|
|
|
|
let discr_repr = self.lvalue_repr(discr);
|
2016-03-14 22:18:39 -05:00
|
|
|
let discr_val = try!(self.memory.read_primval(discr_ptr, &discr_repr));
|
2016-03-07 08:22:18 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
// Branch to the `otherwise` case by default, if no match is found.
|
|
|
|
let mut target_block = targets[targets.len() - 1];
|
2016-03-07 04:48:12 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
for (index, val_const) in values.iter().enumerate() {
|
|
|
|
let ptr = try!(self.const_to_ptr(val_const));
|
|
|
|
let val = try!(self.memory.read_primval(ptr, &discr_repr));
|
|
|
|
if discr_val == val {
|
|
|
|
target_block = targets[index];
|
|
|
|
break;
|
2016-03-14 21:39:51 -05:00
|
|
|
}
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
2016-03-13 07:30:28 -05:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
TerminatorTarget::Block(target_block)
|
|
|
|
}
|
2016-03-13 17:08:23 -05:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
Switch { ref discr, ref targets, .. } => {
|
2016-03-15 08:13:31 -05:00
|
|
|
let adt_ptr = try!(self.eval_lvalue(discr));
|
|
|
|
let adt_repr = self.lvalue_repr(discr);
|
2016-03-14 22:18:39 -05:00
|
|
|
let discr_repr = match adt_repr {
|
|
|
|
Repr::Sum { ref discr, .. } => discr,
|
|
|
|
_ => panic!("attmpted to switch on non-sum type"),
|
|
|
|
};
|
|
|
|
let discr_val = try!(self.memory.read_primval(adt_ptr, &discr_repr));
|
2016-03-15 00:03:31 -05:00
|
|
|
TerminatorTarget::Block(targets[discr_val.to_usize()])
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
2016-03-14 21:39:51 -05:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
Call { ref func, ref args, ref destination, .. } => {
|
|
|
|
let mut return_ptr = None;
|
|
|
|
if let Some((ref lv, target)) = *destination {
|
|
|
|
self.current_frame_mut().next_block = target;
|
2016-03-15 08:13:31 -05:00
|
|
|
return_ptr = Some(try!(self.eval_lvalue(lv)));
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
2016-03-14 21:39:51 -05:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
let func_ty = self.current_frame().mir.operand_ty(self.tcx, func);
|
2016-03-13 17:08:23 -05:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
match func_ty.sty {
|
2016-03-15 01:45:25 -05:00
|
|
|
ty::TyFnDef(def_id, substs, bare_fn_ty) => {
|
|
|
|
use syntax::abi::Abi;
|
|
|
|
match bare_fn_ty.abi {
|
|
|
|
Abi::RustIntrinsic => match &self.tcx.item_name(def_id).as_str()[..] {
|
|
|
|
"size_of" => {
|
|
|
|
let ty = *substs.types.get(subst::FnSpace, 0);
|
2016-03-15 08:13:31 -05:00
|
|
|
let ret_ptr = &mir::Lvalue::ReturnPointer;
|
|
|
|
let dest = try!(self.eval_lvalue(ret_ptr));
|
|
|
|
let dest_repr = self.lvalue_repr(ret_ptr);
|
2016-03-15 01:45:25 -05:00
|
|
|
let size = PrimVal::from_usize(self.ty_to_repr(ty).size(),
|
|
|
|
&dest_repr);
|
|
|
|
try!(self.memory.write_primval(dest, size));
|
|
|
|
|
|
|
|
// Since we pushed no stack frame, the main loop will act as if
|
|
|
|
// the call just completed and it's returning to the current
|
|
|
|
// frame.
|
|
|
|
TerminatorTarget::Call
|
|
|
|
},
|
|
|
|
|
|
|
|
name => panic!("can't handle intrinsic named {}", name),
|
|
|
|
},
|
|
|
|
|
|
|
|
Abi::Rust => {
|
|
|
|
let mir = self.load_mir(def_id);
|
|
|
|
let substs = self.tcx.mk_substs(
|
|
|
|
substs.subst(self.tcx, self.current_substs()));
|
|
|
|
self.substs_stack.push(substs);
|
|
|
|
try!(self.push_stack_frame(mir, args, return_ptr));
|
|
|
|
TerminatorTarget::Call
|
|
|
|
}
|
|
|
|
|
|
|
|
abi => panic!("can't handle function with ABI {:?}", abi),
|
|
|
|
}
|
2016-03-13 17:08:23 -05:00
|
|
|
}
|
2016-02-27 19:20:25 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
_ => panic!("can't handle callee of type {:?}", func_ty),
|
2016-02-18 19:06:22 -06:00
|
|
|
}
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
2016-03-14 21:39:51 -05:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
Drop { target, .. } => {
|
|
|
|
// TODO: Handle destructors and dynamic drop.
|
|
|
|
TerminatorTarget::Block(target)
|
|
|
|
}
|
2015-11-12 15:50:58 -06:00
|
|
|
|
2016-03-14 22:18:39 -05:00
|
|
|
Resume => unimplemented!(),
|
|
|
|
};
|
|
|
|
|
|
|
|
Ok(target)
|
2015-11-14 01:19:07 -06:00
|
|
|
}
|
|
|
|
|
2016-03-12 22:27:54 -06:00
|
|
|
fn assign_to_product(&mut self, dest: Pointer, dest_repr: &Repr,
|
2016-03-12 22:15:59 -06:00
|
|
|
operands: &[mir::Operand<'tcx>]) -> EvalResult<()> {
|
2016-03-12 22:27:54 -06:00
|
|
|
match *dest_repr {
|
2016-03-12 22:15:59 -06:00
|
|
|
Repr::Product { ref fields, .. } => {
|
|
|
|
for (field, operand) in fields.iter().zip(operands) {
|
2016-03-13 01:14:20 -06:00
|
|
|
let (src, _) = try!(self.eval_operand(operand));
|
2016-03-12 22:15:59 -06:00
|
|
|
try!(self.memory.copy(src, dest.offset(field.offset), field.repr.size()));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
_ => panic!("expected Repr::Product target"),
|
|
|
|
}
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2016-03-07 07:10:52 -06:00
|
|
|
fn eval_assignment(&mut self, lvalue: &mir::Lvalue<'tcx>, rvalue: &mir::Rvalue<'tcx>)
|
|
|
|
-> EvalResult<()>
|
|
|
|
{
|
2016-03-15 08:13:31 -05:00
|
|
|
let dest = try!(self.eval_lvalue(lvalue));
|
|
|
|
let dest_repr = self.lvalue_repr(lvalue);
|
2015-11-20 15:54:02 -06:00
|
|
|
|
2016-03-07 03:32:02 -06:00
|
|
|
use rustc::mir::repr::Rvalue::*;
|
2015-11-12 16:13:35 -06:00
|
|
|
match *rvalue {
|
2016-03-07 03:32:02 -06:00
|
|
|
Use(ref operand) => {
|
2016-03-13 01:14:20 -06:00
|
|
|
let (src, _) = try!(self.eval_operand(operand));
|
2016-03-07 07:10:52 -06:00
|
|
|
self.memory.copy(src, dest, dest_repr.size())
|
2016-02-27 19:20:25 -06:00
|
|
|
}
|
2015-11-20 15:54:02 -06:00
|
|
|
|
2016-03-13 01:43:28 -06:00
|
|
|
BinaryOp(bin_op, ref left, ref right) => {
|
|
|
|
let (left_ptr, left_repr) = try!(self.eval_operand(left));
|
|
|
|
let (right_ptr, right_repr) = try!(self.eval_operand(right));
|
|
|
|
let left_val = try!(self.memory.read_primval(left_ptr, &left_repr));
|
|
|
|
let right_val = try!(self.memory.read_primval(right_ptr, &right_repr));
|
|
|
|
self.memory.write_primval(dest, primval::binary_op(bin_op, left_val, right_val))
|
|
|
|
}
|
2016-03-07 07:10:52 -06:00
|
|
|
|
2016-03-07 07:57:08 -06:00
|
|
|
UnaryOp(un_op, ref operand) => {
|
2016-03-13 01:43:28 -06:00
|
|
|
let (ptr, repr) = try!(self.eval_operand(operand));
|
|
|
|
let val = try!(self.memory.read_primval(ptr, &repr));
|
|
|
|
self.memory.write_primval(dest, primval::unary_op(un_op, val))
|
2016-03-07 07:57:08 -06:00
|
|
|
}
|
2016-03-04 23:17:31 -06:00
|
|
|
|
2016-03-12 22:15:59 -06:00
|
|
|
Aggregate(ref kind, ref operands) => {
|
|
|
|
use rustc::mir::repr::AggregateKind::*;
|
|
|
|
match *kind {
|
2016-03-12 22:27:54 -06:00
|
|
|
Tuple => self.assign_to_product(dest, &dest_repr, operands),
|
|
|
|
|
|
|
|
Adt(ref adt_def, variant_idx, _) => match adt_def.adt_kind() {
|
|
|
|
ty::AdtKind::Struct => self.assign_to_product(dest, &dest_repr, operands),
|
|
|
|
|
|
|
|
ty::AdtKind::Enum => match dest_repr {
|
2016-03-13 01:55:48 -06:00
|
|
|
Repr::Sum { ref discr, ref variants, .. } => {
|
2016-03-13 07:05:48 -05:00
|
|
|
if discr.size() > 0 {
|
2016-03-15 00:03:31 -05:00
|
|
|
let discr_val = PrimVal::from_usize(variant_idx, discr);
|
2016-03-13 07:05:48 -05:00
|
|
|
try!(self.memory.write_primval(dest, discr_val));
|
|
|
|
}
|
2016-03-12 22:27:54 -06:00
|
|
|
self.assign_to_product(
|
2016-03-13 01:55:48 -06:00
|
|
|
dest.offset(discr.size()),
|
2016-03-12 22:27:54 -06:00
|
|
|
&variants[variant_idx],
|
|
|
|
operands
|
2016-03-12 23:15:53 -06:00
|
|
|
)
|
|
|
|
}
|
2016-03-12 22:27:54 -06:00
|
|
|
_ => panic!("expected Repr::Sum target"),
|
2016-03-12 22:15:59 -06:00
|
|
|
}
|
2016-03-12 22:27:54 -06:00
|
|
|
},
|
2016-03-12 22:15:59 -06:00
|
|
|
|
2016-03-15 06:50:53 -05:00
|
|
|
Vec => match dest_repr {
|
|
|
|
Repr::Array { ref elem, length } => {
|
|
|
|
assert_eq!(length, operands.len());
|
|
|
|
let elem_size = elem.size();
|
|
|
|
for (i, operand) in operands.iter().enumerate() {
|
|
|
|
let (src, _) = try!(self.eval_operand(operand));
|
|
|
|
let offset = i * elem_size;
|
|
|
|
try!(self.memory.copy(src, dest.offset(offset), elem_size));
|
|
|
|
}
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
_ => panic!("expected Repr::Array target"),
|
|
|
|
},
|
|
|
|
|
2016-03-12 22:15:59 -06:00
|
|
|
Closure(..) => unimplemented!(),
|
|
|
|
}
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
2015-11-12 17:24:43 -06:00
|
|
|
|
2016-03-13 15:36:25 -05:00
|
|
|
Ref(_, _, ref lvalue) => {
|
2016-03-15 08:13:31 -05:00
|
|
|
let ptr = try!(self.eval_lvalue(lvalue));
|
2016-03-13 15:36:25 -05:00
|
|
|
self.memory.write_ptr(dest, ptr)
|
|
|
|
}
|
2015-12-28 22:24:05 -06:00
|
|
|
|
2016-03-14 23:05:50 -05:00
|
|
|
Box(ty) => {
|
|
|
|
let repr = self.ty_to_repr(ty);
|
|
|
|
let ptr = self.memory.allocate(repr.size());
|
|
|
|
self.memory.write_ptr(dest, ptr)
|
|
|
|
}
|
|
|
|
|
2015-12-18 22:22:34 -06:00
|
|
|
ref r => panic!("can't handle rvalue: {:?}", r),
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-13 01:14:20 -06:00
|
|
|
fn eval_operand(&mut self, op: &mir::Operand<'tcx>) -> EvalResult<(Pointer, Repr)> {
|
2016-03-07 03:32:02 -06:00
|
|
|
use rustc::mir::repr::Operand::*;
|
2015-11-12 15:50:58 -06:00
|
|
|
match *op {
|
2016-03-15 08:13:31 -05:00
|
|
|
Consume(ref lvalue) => Ok((try!(self.eval_lvalue(lvalue)), self.lvalue_repr(lvalue))),
|
2015-11-14 01:19:07 -06:00
|
|
|
|
2016-03-13 01:14:20 -06:00
|
|
|
Constant(mir::Constant { ref literal, ty, .. }) => {
|
2016-03-07 03:32:02 -06:00
|
|
|
use rustc::mir::repr::Literal::*;
|
2016-03-13 01:14:20 -06:00
|
|
|
match *literal {
|
|
|
|
Value { ref value } => Ok((
|
|
|
|
try!(self.const_to_ptr(value)),
|
|
|
|
self.ty_to_repr(ty),
|
|
|
|
)),
|
2016-03-12 20:23:48 -06:00
|
|
|
ref l => panic!("can't handle item literal: {:?}", l),
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2015-11-12 17:44:29 -06:00
|
|
|
|
2016-03-15 08:13:31 -05:00
|
|
|
fn lvalue_repr(&self, lvalue: &mir::Lvalue<'tcx>) -> Repr {
|
|
|
|
use rustc::mir::tcx::LvalueTy;
|
|
|
|
match self.current_frame().mir.lvalue_ty(self.tcx, lvalue) {
|
|
|
|
LvalueTy::Ty { ty } => self.ty_to_repr(ty),
|
|
|
|
LvalueTy::Downcast { ref adt_def, substs, variant_index } =>
|
|
|
|
self.make_variant_repr(&adt_def.variants[variant_index], substs),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn eval_lvalue(&self, lvalue: &mir::Lvalue<'tcx>) -> EvalResult<Pointer> {
|
2016-03-07 07:48:38 -06:00
|
|
|
let frame = self.current_frame();
|
|
|
|
|
|
|
|
use rustc::mir::repr::Lvalue::*;
|
|
|
|
let ptr = match *lvalue {
|
|
|
|
ReturnPointer =>
|
|
|
|
frame.return_ptr.expect("ReturnPointer used in a function with no return value"),
|
2016-03-14 22:48:00 -05:00
|
|
|
Arg(i) => frame.locals[i as usize],
|
|
|
|
Var(i) => frame.locals[frame.var_offset + i as usize],
|
|
|
|
Temp(i) => frame.locals[frame.temp_offset + i as usize],
|
2016-03-13 07:48:04 -05:00
|
|
|
|
|
|
|
Projection(ref proj) => {
|
2016-03-15 08:13:31 -05:00
|
|
|
let base_ptr = try!(self.eval_lvalue(&proj.base));
|
|
|
|
let base_repr = self.lvalue_repr(&proj.base);
|
2016-03-13 07:48:04 -05:00
|
|
|
use rustc::mir::repr::ProjectionElem::*;
|
|
|
|
match proj.elem {
|
|
|
|
Field(field, _) => match base_repr {
|
|
|
|
Repr::Product { ref fields, .. } =>
|
|
|
|
base_ptr.offset(fields[field.index()].offset),
|
2016-03-13 08:23:48 -05:00
|
|
|
_ => panic!("field access on non-product type: {:?}", base_repr),
|
|
|
|
},
|
|
|
|
|
2016-03-13 09:01:22 -05:00
|
|
|
Downcast(..) => match base_repr {
|
2016-03-13 08:23:48 -05:00
|
|
|
Repr::Sum { ref discr, .. } => base_ptr.offset(discr.size()),
|
|
|
|
_ => panic!("variant downcast on non-sum type"),
|
2016-03-13 07:48:04 -05:00
|
|
|
},
|
|
|
|
|
2016-03-13 15:36:25 -05:00
|
|
|
Deref => try!(self.memory.read_ptr(base_ptr)),
|
|
|
|
|
2016-03-13 07:48:04 -05:00
|
|
|
_ => unimplemented!(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-07 07:48:38 -06:00
|
|
|
ref l => panic!("can't handle lvalue: {:?}", l),
|
|
|
|
};
|
|
|
|
|
2016-03-15 08:13:31 -05:00
|
|
|
Ok(ptr)
|
2016-03-07 07:48:38 -06:00
|
|
|
}
|
|
|
|
|
2016-03-05 00:45:54 -06:00
|
|
|
fn const_to_ptr(&mut self, const_val: &const_eval::ConstVal) -> EvalResult<Pointer> {
|
2016-03-07 03:32:02 -06:00
|
|
|
use rustc::middle::const_eval::ConstVal::*;
|
2015-11-12 17:44:29 -06:00
|
|
|
match *const_val {
|
2016-03-07 04:44:03 -06:00
|
|
|
Float(_f) => unimplemented!(),
|
2016-03-15 17:09:08 -05:00
|
|
|
Integral(int) => {
|
2016-03-12 23:15:53 -06:00
|
|
|
// TODO(tsion): Check int constant type.
|
|
|
|
let ptr = self.memory.allocate(8);
|
2016-03-15 17:09:08 -05:00
|
|
|
try!(self.memory.write_u64(ptr, int.to_u64_unchecked()));
|
2016-03-15 01:45:25 -05:00
|
|
|
Ok(ptr)
|
|
|
|
}
|
|
|
|
Str(ref _s) => unimplemented!(),
|
|
|
|
ByteStr(ref _bs) => unimplemented!(),
|
2016-03-07 04:44:03 -06:00
|
|
|
Bool(b) => {
|
2016-03-07 07:19:43 -06:00
|
|
|
let ptr = self.memory.allocate(Repr::Bool.size());
|
2016-03-07 07:10:52 -06:00
|
|
|
try!(self.memory.write_bool(ptr, b));
|
2016-03-07 04:44:03 -06:00
|
|
|
Ok(ptr)
|
2016-03-15 01:45:25 -05:00
|
|
|
}
|
2016-03-15 17:09:08 -05:00
|
|
|
Char(_c) => unimplemented!(),
|
2016-03-07 03:32:02 -06:00
|
|
|
Struct(_node_id) => unimplemented!(),
|
|
|
|
Tuple(_node_id) => unimplemented!(),
|
|
|
|
Function(_def_id) => unimplemented!(),
|
|
|
|
Array(_, _) => unimplemented!(),
|
|
|
|
Repeat(_, _) => unimplemented!(),
|
2016-03-15 17:09:08 -05:00
|
|
|
Dummy => unimplemented!(),
|
2015-11-12 17:44:29 -06:00
|
|
|
}
|
|
|
|
}
|
2016-03-07 07:10:52 -06:00
|
|
|
|
2016-03-12 22:15:59 -06:00
|
|
|
fn make_product_repr<I>(&self, iter: I) -> Repr where I: IntoIterator<Item = ty::Ty<'tcx>> {
|
2016-03-11 21:27:54 -06:00
|
|
|
let mut size = 0;
|
|
|
|
let fields = iter.into_iter().map(|ty| {
|
|
|
|
let repr = self.ty_to_repr(ty);
|
|
|
|
let old_size = size;
|
|
|
|
size += repr.size();
|
|
|
|
FieldRepr { offset: old_size, repr: repr }
|
|
|
|
}).collect();
|
2016-03-12 22:15:59 -06:00
|
|
|
Repr::Product { size: size, fields: fields }
|
2016-03-11 21:27:54 -06:00
|
|
|
}
|
|
|
|
|
2016-03-13 08:23:48 -05:00
|
|
|
fn make_variant_repr(&self, v: ty::VariantDef<'tcx>, substs: &'tcx Substs<'tcx>) -> Repr {
|
|
|
|
let field_tys = v.fields.iter().map(|f| f.ty(self.tcx, substs));
|
|
|
|
self.make_product_repr(field_tys)
|
|
|
|
}
|
|
|
|
|
2016-03-11 21:27:54 -06:00
|
|
|
// TODO(tsion): Cache these outputs.
|
|
|
|
fn ty_to_repr(&self, ty: ty::Ty<'tcx>) -> Repr {
|
2016-03-14 23:26:39 -05:00
|
|
|
use syntax::ast::{IntTy, UintTy};
|
|
|
|
match ty.subst(self.tcx, self.current_substs()).sty {
|
2016-03-11 21:27:54 -06:00
|
|
|
ty::TyBool => Repr::Bool,
|
2016-03-12 23:15:53 -06:00
|
|
|
|
2016-03-15 00:03:31 -05:00
|
|
|
ty::TyInt(IntTy::Is) => Repr::isize(),
|
|
|
|
ty::TyInt(IntTy::I8) => Repr::I8,
|
2016-03-13 01:48:07 -06:00
|
|
|
ty::TyInt(IntTy::I16) => Repr::I16,
|
|
|
|
ty::TyInt(IntTy::I32) => Repr::I32,
|
|
|
|
ty::TyInt(IntTy::I64) => Repr::I64,
|
2016-03-12 23:15:53 -06:00
|
|
|
|
2016-03-15 00:03:31 -05:00
|
|
|
ty::TyUint(UintTy::Us) => Repr::usize(),
|
|
|
|
ty::TyUint(UintTy::U8) => Repr::U8,
|
|
|
|
ty::TyUint(UintTy::U16) => Repr::U16,
|
|
|
|
ty::TyUint(UintTy::U32) => Repr::U32,
|
|
|
|
ty::TyUint(UintTy::U64) => Repr::U64,
|
|
|
|
|
2016-03-12 22:15:59 -06:00
|
|
|
ty::TyTuple(ref fields) => self.make_product_repr(fields.iter().cloned()),
|
|
|
|
|
2016-03-13 08:23:48 -05:00
|
|
|
ty::TyEnum(adt_def, substs) => {
|
2016-03-12 22:15:59 -06:00
|
|
|
let num_variants = adt_def.variants.len();
|
|
|
|
|
2016-03-13 01:55:48 -06:00
|
|
|
let discr = if num_variants <= 1 {
|
|
|
|
Repr::Product { size: 0, fields: vec![] }
|
2016-03-12 22:15:59 -06:00
|
|
|
} else if num_variants <= 1 << 8 {
|
2016-03-15 00:03:31 -05:00
|
|
|
Repr::U8
|
2016-03-12 22:15:59 -06:00
|
|
|
} else if num_variants <= 1 << 16 {
|
2016-03-15 00:03:31 -05:00
|
|
|
Repr::U16
|
2016-03-12 22:15:59 -06:00
|
|
|
} else if num_variants <= 1 << 32 {
|
2016-03-15 00:03:31 -05:00
|
|
|
Repr::U32
|
2016-03-12 22:15:59 -06:00
|
|
|
} else {
|
2016-03-15 00:03:31 -05:00
|
|
|
Repr::U64
|
2016-03-12 22:15:59 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
let variants: Vec<Repr> = adt_def.variants.iter().map(|v| {
|
2016-03-13 08:23:48 -05:00
|
|
|
self.make_variant_repr(v, substs)
|
2016-03-12 22:15:59 -06:00
|
|
|
}).collect();
|
|
|
|
|
|
|
|
Repr::Sum {
|
2016-03-13 01:55:48 -06:00
|
|
|
discr: Box::new(discr),
|
2016-03-12 22:15:59 -06:00
|
|
|
max_variant_size: variants.iter().map(Repr::size).max().unwrap_or(0),
|
|
|
|
variants: variants,
|
|
|
|
}
|
|
|
|
}
|
2016-03-11 21:27:54 -06:00
|
|
|
|
2016-03-13 08:23:48 -05:00
|
|
|
ty::TyStruct(adt_def, substs) => {
|
2016-03-12 22:15:59 -06:00
|
|
|
assert_eq!(adt_def.variants.len(), 1);
|
2016-03-13 08:23:48 -05:00
|
|
|
self.make_variant_repr(&adt_def.variants[0], substs)
|
2016-03-11 21:27:54 -06:00
|
|
|
}
|
|
|
|
|
2016-03-15 06:50:53 -05:00
|
|
|
ty::TyArray(ref elem_ty, length) => Repr::Array {
|
|
|
|
elem: Box::new(self.ty_to_repr(elem_ty)),
|
|
|
|
length: length,
|
|
|
|
},
|
|
|
|
|
|
|
|
ty::TyRef(_, ty::TypeAndMut { ty, .. }) | ty::TyBox(ty) => Repr::Pointer {
|
|
|
|
target: Box::new(self.ty_to_repr(ty))
|
|
|
|
},
|
2016-03-13 15:36:25 -05:00
|
|
|
|
2016-03-11 21:27:54 -06:00
|
|
|
ref t => panic!("can't convert type to repr: {:?}", t),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-07 07:10:52 -06:00
|
|
|
fn current_frame(&self) -> &Frame<'a, 'tcx> {
|
|
|
|
self.stack.last().expect("no call frames exist")
|
|
|
|
}
|
2016-03-14 21:39:51 -05:00
|
|
|
|
|
|
|
fn current_frame_mut(&mut self) -> &mut Frame<'a, 'tcx> {
|
|
|
|
self.stack.last_mut().expect("no call frames exist")
|
|
|
|
}
|
2015-11-12 15:50:58 -06:00
|
|
|
|
2016-03-14 23:26:39 -05:00
|
|
|
fn current_substs(&self) -> &'tcx Substs<'tcx> {
|
|
|
|
self.substs_stack.last().cloned().unwrap_or_else(|| self.tcx.mk_substs(Substs::empty()))
|
|
|
|
}
|
|
|
|
|
2016-03-14 22:48:00 -05:00
|
|
|
fn load_mir(&self, def_id: DefId) -> CachedMir<'a, 'tcx> {
|
|
|
|
match self.tcx.map.as_local_node_id(def_id) {
|
|
|
|
Some(node_id) => CachedMir::Ref(self.mir_map.map.get(&node_id).unwrap()),
|
|
|
|
None => {
|
|
|
|
let mut mir_cache = self.mir_cache.borrow_mut();
|
|
|
|
if let Some(mir) = mir_cache.get(&def_id) {
|
|
|
|
return CachedMir::Owned(mir.clone());
|
|
|
|
}
|
2016-03-14 22:18:39 -05:00
|
|
|
|
2016-03-14 22:48:00 -05:00
|
|
|
use rustc::middle::cstore::CrateStore;
|
|
|
|
let cs = &self.tcx.sess.cstore;
|
|
|
|
let mir = cs.maybe_get_item_mir(self.tcx, def_id).unwrap();
|
|
|
|
let cached = Rc::new(mir);
|
|
|
|
mir_cache.insert(def_id, cached.clone());
|
|
|
|
CachedMir::Owned(cached)
|
|
|
|
}
|
|
|
|
}
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
2016-03-14 22:48:00 -05:00
|
|
|
}
|
2016-03-14 22:18:39 -05:00
|
|
|
|
2016-03-14 22:48:00 -05:00
|
|
|
impl<'mir, 'tcx: 'mir> Deref for CachedMir<'mir, 'tcx> {
|
|
|
|
type Target = mir::Mir<'tcx>;
|
|
|
|
fn deref(&self) -> &mir::Mir<'tcx> {
|
|
|
|
match *self {
|
|
|
|
CachedMir::Ref(r) => r,
|
|
|
|
CachedMir::Owned(ref rc) => &rc,
|
|
|
|
}
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-04 23:17:31 -06:00
|
|
|
pub fn interpret_start_points<'tcx>(tcx: &TyCtxt<'tcx>, mir_map: &MirMap<'tcx>) {
|
2016-03-14 23:05:50 -05:00
|
|
|
/// Print the given allocation and all allocations it depends on.
|
|
|
|
fn print_allocation_tree(memory: &Memory, alloc_id: memory::AllocId) {
|
|
|
|
let alloc = memory.get(alloc_id).unwrap();
|
2016-03-14 23:08:38 -05:00
|
|
|
println!(" {:?}: {:?}", alloc_id, alloc);
|
2016-03-14 23:05:50 -05:00
|
|
|
for &target_alloc in alloc.relocations.values() {
|
|
|
|
print_allocation_tree(memory, target_alloc);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-02-18 19:06:22 -06:00
|
|
|
for (&id, mir) in &mir_map.map {
|
2015-11-12 15:50:58 -06:00
|
|
|
for attr in tcx.map.attrs(id) {
|
2016-03-07 10:14:47 -06:00
|
|
|
use syntax::attr::AttrMetaMethods;
|
2015-11-12 15:50:58 -06:00
|
|
|
if attr.check_name("miri_run") {
|
2015-11-12 17:11:41 -06:00
|
|
|
let item = tcx.map.expect_item(id);
|
|
|
|
|
2015-11-12 15:50:58 -06:00
|
|
|
println!("Interpreting: {}", item.name);
|
2015-11-20 20:49:25 -06:00
|
|
|
|
2016-03-04 23:17:31 -06:00
|
|
|
let mut miri = Interpreter::new(tcx, mir_map);
|
2016-02-27 19:20:25 -06:00
|
|
|
let return_ptr = match mir.return_ty {
|
2016-03-11 21:27:54 -06:00
|
|
|
ty::FnConverging(ty) => {
|
|
|
|
let repr = miri.ty_to_repr(ty).size();
|
|
|
|
Some(miri.memory.allocate(repr))
|
|
|
|
}
|
2016-03-04 23:17:31 -06:00
|
|
|
ty::FnDiverging => None,
|
2016-02-27 19:20:25 -06:00
|
|
|
};
|
2016-03-14 21:39:51 -05:00
|
|
|
miri.push_stack_frame(CachedMir::Ref(mir), &[], return_ptr).unwrap();
|
|
|
|
miri.run().unwrap();
|
2015-11-12 17:11:41 -06:00
|
|
|
|
2016-03-04 23:17:31 -06:00
|
|
|
if let Some(ret) = return_ptr {
|
2016-03-14 23:05:50 -05:00
|
|
|
println!("Result:");
|
|
|
|
print_allocation_tree(&miri.memory, ret.alloc_id);
|
2016-03-14 23:26:39 -05:00
|
|
|
println!("");
|
2015-11-12 17:11:41 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|