2016-03-28 18:43:23 -05:00
|
|
|
use rustc::infer;
|
2016-03-31 23:34:07 -05:00
|
|
|
use rustc::middle::const_val;
|
2016-04-13 17:01:00 -05:00
|
|
|
use rustc::hir::def_id::DefId;
|
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;
|
2016-03-28 18:43:23 -05:00
|
|
|
use rustc::traits::{self, ProjectionMode};
|
|
|
|
use rustc::ty::fold::TypeFoldable;
|
2016-04-23 01:03:59 -05:00
|
|
|
use rustc::ty::layout::{self, Layout, Size};
|
2016-03-28 18:43:23 -05:00
|
|
|
use rustc::ty::subst::{self, Subst, Substs};
|
|
|
|
use rustc::ty::{self, TyCtxt};
|
2016-03-13 18:19:42 -05:00
|
|
|
use rustc::util::nodemap::DefIdMap;
|
|
|
|
use std::cell::RefCell;
|
2016-05-09 19:21:21 -05:00
|
|
|
use std::ops::{Deref, DerefMut};
|
2016-03-13 18:19:42 -05:00
|
|
|
use std::rc::Rc;
|
2016-04-07 06:56:07 -05:00
|
|
|
use std::{iter, mem};
|
2016-03-18 12:52:13 -05:00
|
|
|
use syntax::ast;
|
2016-03-20 19:41:39 -05:00
|
|
|
use syntax::attr;
|
2016-03-29 20:09:26 -05:00
|
|
|
use syntax::codemap::{self, DUMMY_SP};
|
2015-11-12 15:50:58 -06:00
|
|
|
|
2016-03-19 00:03:46 -05:00
|
|
|
use error::{EvalError, EvalResult};
|
2016-04-23 01:03:59 -05:00
|
|
|
use memory::{Memory, Pointer};
|
2016-03-19 00:03:46 -05:00
|
|
|
use primval::{self, PrimVal};
|
2016-03-05 00:23:37 -06:00
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
const TRACE_EXECUTION: bool = true;
|
2016-02-27 19:20:25 -06:00
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
struct GlobalEvalContext<'a, 'tcx: 'a> {
|
2016-03-14 22:18:39 -05:00
|
|
|
/// 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,
|
|
|
|
|
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>>,
|
2016-03-30 23:04:53 -05:00
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Merge with `substs_stack`. Also try restructuring `Frame` to accomodate.
|
2016-03-30 23:04:53 -05:00
|
|
|
/// A stack of the things necessary to print good strack traces:
|
|
|
|
/// * Function DefIds and Substs to print proper substituted function names.
|
|
|
|
/// * Spans pointing to specific function calls in the source.
|
|
|
|
name_stack: Vec<(DefId, &'tcx Substs<'tcx>, codemap::Span)>,
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
struct FnEvalContext<'a, 'b: 'a + 'mir, 'mir, 'tcx: 'b> {
|
|
|
|
gecx: &'a mut GlobalEvalContext<'b, 'tcx>,
|
|
|
|
|
|
|
|
/// The virtual call stack.
|
|
|
|
stack: Vec<Frame<'mir, 'tcx>>,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<'a, 'b, 'mir, 'tcx> Deref for FnEvalContext<'a, 'b, 'mir, 'tcx> {
|
|
|
|
type Target = GlobalEvalContext<'b, 'tcx>;
|
|
|
|
fn deref(&self) -> &Self::Target {
|
|
|
|
self.gecx
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<'a, 'b, 'mir, 'tcx> DerefMut for FnEvalContext<'a, 'b, 'mir, 'tcx> {
|
|
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
|
|
self.gecx
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
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
|
|
|
|
2016-03-20 23:59:13 -05:00
|
|
|
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
|
|
|
|
struct Lvalue {
|
|
|
|
ptr: Pointer,
|
|
|
|
extra: LvalueExtra,
|
|
|
|
}
|
|
|
|
|
|
|
|
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
|
|
|
|
enum LvalueExtra {
|
|
|
|
None,
|
|
|
|
Length(u64),
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Vtable(memory::AllocId),
|
2016-04-30 00:32:15 -05:00
|
|
|
DowncastVariant(usize),
|
2016-03-20 23:59:13 -05:00
|
|
|
}
|
|
|
|
|
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
|
|
|
}
|
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
impl<'a, 'tcx> GlobalEvalContext<'a, 'tcx> {
|
2016-04-23 01:03:59 -05:00
|
|
|
fn new(tcx: &'a TyCtxt<'tcx>, mir_map: &'a MirMap<'tcx>) -> Self {
|
2016-05-09 19:21:21 -05:00
|
|
|
GlobalEvalContext {
|
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(),
|
2016-03-14 21:39:51 -05:00
|
|
|
substs_stack: Vec::new(),
|
2016-03-30 23:04:53 -05:00
|
|
|
name_stack: Vec::new(),
|
2016-03-06 04:23:24 -06:00
|
|
|
}
|
|
|
|
}
|
2016-05-09 19:21:21 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
impl<'a, 'b, 'mir, 'tcx> FnEvalContext<'a, 'b, 'mir, 'tcx> {
|
|
|
|
fn new(gecx: &'a mut GlobalEvalContext<'b, 'tcx>) -> Self {
|
|
|
|
FnEvalContext {
|
|
|
|
gecx: gecx,
|
|
|
|
stack: Vec::new(),
|
|
|
|
}
|
|
|
|
}
|
2016-03-06 04:23:24 -06:00
|
|
|
|
2016-03-29 20:09:26 -05:00
|
|
|
fn maybe_report<T>(&self, span: codemap::Span, r: EvalResult<T>) -> EvalResult<T> {
|
|
|
|
if let Err(ref e) = r {
|
|
|
|
let mut err = self.tcx.sess.struct_span_err(span, &e.to_string());
|
2016-03-30 23:04:53 -05:00
|
|
|
for &(def_id, substs, span) in self.name_stack.iter().rev() {
|
2016-05-09 21:08:37 -05:00
|
|
|
// FIXME(solson): Find a way to do this without this Display impl hack.
|
2016-03-30 23:04:53 -05:00
|
|
|
use rustc::util::ppaux;
|
|
|
|
use std::fmt;
|
|
|
|
struct Instance<'tcx>(DefId, &'tcx Substs<'tcx>);
|
|
|
|
impl<'tcx> fmt::Display for Instance<'tcx> {
|
|
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
|
|
ppaux::parameterized(f, self.1, self.0, ppaux::Ns::Value, &[],
|
|
|
|
|tcx| tcx.lookup_item_type(self.0).generics)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
err.span_note(span, &format!("inside call to {}", Instance(def_id, substs)));
|
|
|
|
}
|
2016-03-29 20:09:26 -05:00
|
|
|
err.emit();
|
|
|
|
}
|
|
|
|
r
|
|
|
|
}
|
|
|
|
|
2016-04-06 04:45:06 -05:00
|
|
|
fn log<F>(&self, extra_indent: usize, f: F) where F: FnOnce() {
|
2016-04-06 20:28:40 -05:00
|
|
|
let indent = self.stack.len() + extra_indent;
|
2016-04-06 04:45:06 -05:00
|
|
|
if !TRACE_EXECUTION { return; }
|
2016-04-06 20:28:40 -05:00
|
|
|
for _ in 0..indent { print!(" "); }
|
2016-04-06 04:45:06 -05:00
|
|
|
f();
|
|
|
|
println!("");
|
|
|
|
}
|
2016-03-14 22:48:00 -05:00
|
|
|
|
2016-04-06 04:45:06 -05:00
|
|
|
fn run(&mut self) -> EvalResult<()> {
|
2016-03-14 22:48:00 -05:00
|
|
|
'outer: while !self.stack.is_empty() {
|
2016-03-20 23:07:25 -05:00
|
|
|
let mut current_block = self.frame().next_block;
|
2016-03-14 22:48:00 -05:00
|
|
|
|
|
|
|
loop {
|
2016-04-06 20:28:40 -05:00
|
|
|
self.log(0, || print!("// {:?}", current_block));
|
2016-03-20 23:07:25 -05:00
|
|
|
let current_mir = self.mir().clone(); // Cloning a reference.
|
2016-03-14 22:48:00 -05:00
|
|
|
let block_data = current_mir.basic_block_data(current_block);
|
|
|
|
|
|
|
|
for stmt in &block_data.statements {
|
2016-04-06 20:28:40 -05:00
|
|
|
self.log(0, || print!("{:?}", stmt));
|
2016-04-29 10:47:04 -05:00
|
|
|
let mir::StatementKind::Assign(ref lvalue, ref rvalue) = stmt.kind;
|
|
|
|
let result = self.eval_assignment(lvalue, rvalue);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.maybe_report(stmt.span, result)?;
|
2016-03-14 22:48:00 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
let terminator = block_data.terminator();
|
2016-04-06 20:28:40 -05:00
|
|
|
self.log(0, || print!("{:?}", terminator.kind));
|
2016-03-14 22:48:00 -05:00
|
|
|
|
2016-03-29 20:09:26 -05:00
|
|
|
let result = self.eval_terminator(terminator);
|
2016-05-09 19:52:44 -05:00
|
|
|
match self.maybe_report(terminator.span, result)? {
|
2016-03-14 22:48:00 -05:00
|
|
|
TerminatorTarget::Block(block) => current_block = block,
|
|
|
|
TerminatorTarget::Return => {
|
|
|
|
self.pop_stack_frame();
|
2016-03-30 23:04:53 -05:00
|
|
|
self.name_stack.pop();
|
2016-03-14 22:48:00 -05:00
|
|
|
continue 'outer;
|
|
|
|
}
|
|
|
|
TerminatorTarget::Call => continue 'outer,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
fn call_nested(&mut self, mir: &mir::Mir<'tcx>) -> EvalResult<Option<Pointer>> {
|
|
|
|
let mut nested_fecx = FnEvalContext::new(self.gecx);
|
|
|
|
|
|
|
|
let return_ptr = match mir.return_ty {
|
|
|
|
ty::FnConverging(ty) => {
|
|
|
|
let size = nested_fecx.type_size(ty);
|
|
|
|
Some(nested_fecx.memory.allocate(size))
|
|
|
|
}
|
|
|
|
ty::FnDiverging => None,
|
|
|
|
};
|
|
|
|
|
|
|
|
let substs = nested_fecx.substs();
|
|
|
|
nested_fecx.push_stack_frame(CachedMir::Ref(mir), substs, return_ptr);
|
2016-05-09 19:52:44 -05:00
|
|
|
nested_fecx.run()?;
|
2016-05-09 19:21:21 -05:00
|
|
|
Ok(return_ptr)
|
|
|
|
}
|
|
|
|
|
|
|
|
fn push_stack_frame(&mut self, mir: CachedMir<'mir, 'tcx>, substs: &'tcx Substs<'tcx>,
|
2016-03-29 23:13:31 -05:00
|
|
|
return_ptr: Option<Pointer>)
|
|
|
|
{
|
|
|
|
self.substs_stack.push(substs);
|
|
|
|
|
2016-03-18 11:48:31 -05:00
|
|
|
let arg_tys = mir.arg_decls.iter().map(|a| a.ty);
|
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);
|
2016-03-18 11:48:31 -05:00
|
|
|
|
|
|
|
let locals: Vec<Pointer> = arg_tys.chain(var_tys).chain(temp_tys).map(|ty| {
|
2016-04-06 20:01:00 -05:00
|
|
|
let size = self.type_size(ty);
|
2016-03-17 03:53:03 -05:00
|
|
|
self.memory.allocate(size)
|
2016-03-18 11:48:31 -05:00
|
|
|
}).collect();
|
|
|
|
|
|
|
|
let num_args = mir.arg_decls.len();
|
|
|
|
let num_vars = mir.var_decls.len();
|
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,
|
|
|
|
});
|
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");
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Deallocate local variables.
|
2016-03-29 23:13:31 -05:00
|
|
|
self.substs_stack.pop();
|
2016-03-06 04:23:24 -06:00
|
|
|
}
|
|
|
|
|
2016-03-17 00:28:09 -05:00
|
|
|
fn eval_terminator(&mut self, terminator: &mir::Terminator<'tcx>)
|
|
|
|
-> EvalResult<TerminatorTarget> {
|
2016-03-28 18:43:23 -05:00
|
|
|
use rustc::mir::repr::TerminatorKind::*;
|
|
|
|
let target = match terminator.kind {
|
2016-03-14 22:18:39 -05:00
|
|
|
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) } => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let cond_ptr = self.eval_operand(cond)?;
|
|
|
|
let cond_val = self.memory.read_bool(cond_ptr)?;
|
2016-03-14 22:18:39 -05:00
|
|
|
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, .. } => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let discr_ptr = self.eval_lvalue(discr)?.to_ptr();
|
2016-04-30 00:32:15 -05:00
|
|
|
let discr_size = self
|
|
|
|
.type_layout(self.lvalue_ty(discr))
|
|
|
|
.size(&self.tcx.data_layout)
|
|
|
|
.bytes() as usize;
|
2016-05-09 19:52:44 -05:00
|
|
|
let discr_val = self.memory.read_uint(discr_ptr, discr_size)?;
|
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() {
|
2016-05-09 19:52:44 -05:00
|
|
|
let ptr = self.const_to_ptr(val_const)?;
|
|
|
|
let val = self.memory.read_uint(ptr, discr_size)?;
|
2016-03-14 22:18:39 -05:00
|
|
|
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
|
|
|
|
2016-03-28 22:08:08 -05:00
|
|
|
Switch { ref discr, ref targets, adt_def } => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let adt_ptr = self.eval_lvalue(discr)?.to_ptr();
|
2016-04-30 00:32:15 -05:00
|
|
|
let adt_layout = self.type_layout(self.lvalue_ty(discr));
|
2016-03-28 22:08:08 -05:00
|
|
|
|
2016-04-30 02:04:17 -05:00
|
|
|
match *adt_layout {
|
2016-05-08 20:29:00 -05:00
|
|
|
Layout::General { discr, .. } | Layout::CEnum { discr, .. } => {
|
2016-04-30 02:04:17 -05:00
|
|
|
let discr_size = discr.size().bytes();
|
2016-05-09 19:52:44 -05:00
|
|
|
let discr_val = self.memory.read_uint(adt_ptr, discr_size as usize)?;
|
2016-03-28 22:08:08 -05:00
|
|
|
|
2016-04-30 02:04:17 -05:00
|
|
|
let matching = adt_def.variants.iter()
|
|
|
|
.position(|v| discr_val == v.disr_val.to_u64_unchecked());
|
2016-03-28 22:08:08 -05:00
|
|
|
|
2016-04-30 02:04:17 -05:00
|
|
|
match matching {
|
|
|
|
Some(i) => TerminatorTarget::Block(targets[i]),
|
|
|
|
None => return Err(EvalError::InvalidDiscriminant),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
Layout::RawNullablePointer { nndiscr, .. } => {
|
|
|
|
let is_null = match self.memory.read_usize(adt_ptr) {
|
|
|
|
Ok(0) => true,
|
|
|
|
Ok(_) | Err(EvalError::ReadPointerAsBytes) => false,
|
|
|
|
Err(e) => return Err(e),
|
|
|
|
};
|
|
|
|
|
|
|
|
assert!(nndiscr == 0 || nndiscr == 1);
|
|
|
|
let target = if is_null { 1 - nndiscr } else { nndiscr };
|
|
|
|
TerminatorTarget::Block(targets[target as usize])
|
|
|
|
}
|
|
|
|
|
2016-05-08 20:29:00 -05:00
|
|
|
_ => panic!("attempted to switch on non-aggregate type"),
|
2016-03-28 22:08:08 -05:00
|
|
|
}
|
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 {
|
2016-03-20 23:07:25 -05:00
|
|
|
self.frame_mut().next_block = target;
|
2016-05-09 19:52:44 -05:00
|
|
|
return_ptr = Some(self.eval_lvalue(lv)?.to_ptr());
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
2016-03-14 21:39:51 -05:00
|
|
|
|
2016-03-18 11:48:31 -05:00
|
|
|
let func_ty = self.operand_ty(func);
|
2016-03-14 22:18:39 -05:00
|
|
|
match func_ty.sty {
|
2016-03-17 00:28:49 -05:00
|
|
|
ty::TyFnDef(def_id, substs, fn_ty) => {
|
2016-03-15 01:45:25 -05:00
|
|
|
use syntax::abi::Abi;
|
2016-03-17 00:28:49 -05:00
|
|
|
match fn_ty.abi {
|
2016-03-17 07:04:24 -05:00
|
|
|
Abi::RustIntrinsic => {
|
|
|
|
let name = self.tcx.item_name(def_id).as_str();
|
2016-03-19 11:01:53 -05:00
|
|
|
match fn_ty.sig.0.output {
|
|
|
|
ty::FnConverging(ty) => {
|
2016-04-06 20:01:00 -05:00
|
|
|
let size = self.type_size(ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.call_intrinsic(&name, substs, args,
|
|
|
|
return_ptr.unwrap(), size)?
|
2016-03-19 11:01:53 -05:00
|
|
|
}
|
|
|
|
ty::FnDiverging => unimplemented!(),
|
|
|
|
}
|
2016-03-17 07:04:24 -05:00
|
|
|
}
|
2016-03-15 01:45:25 -05:00
|
|
|
|
2016-05-09 19:52:44 -05:00
|
|
|
Abi::C => self.call_c_abi(def_id, args, return_ptr.unwrap())?,
|
2016-03-20 19:41:39 -05:00
|
|
|
|
2016-03-18 11:48:31 -05:00
|
|
|
Abi::Rust | Abi::RustCall => {
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Adjust the first argument when calling a Fn or
|
2016-03-18 11:48:31 -05:00
|
|
|
// FnMut closure via FnOnce::call_once.
|
|
|
|
|
2016-03-17 00:28:49 -05:00
|
|
|
// Only trait methods can have a Self parameter.
|
2016-03-30 23:04:53 -05:00
|
|
|
let (resolved_def_id, resolved_substs) = if substs.self_ty().is_some() {
|
2016-03-17 00:28:49 -05:00
|
|
|
self.trait_method(def_id, substs)
|
|
|
|
} else {
|
|
|
|
(def_id, substs)
|
|
|
|
};
|
|
|
|
|
2016-03-18 11:48:31 -05:00
|
|
|
let mut arg_srcs = Vec::new();
|
|
|
|
for arg in args {
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.eval_operand(arg)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
let src_ty = self.operand_ty(arg);
|
|
|
|
arg_srcs.push((src, src_ty));
|
2016-03-18 11:48:31 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
if fn_ty.abi == Abi::RustCall && !args.is_empty() {
|
|
|
|
arg_srcs.pop();
|
|
|
|
let last_arg = args.last().unwrap();
|
2016-05-09 19:52:44 -05:00
|
|
|
let last = self.eval_operand(last_arg)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
let last_ty = self.operand_ty(last_arg);
|
2016-04-23 01:03:59 -05:00
|
|
|
let last_layout = self.type_layout(last_ty);
|
|
|
|
match (&last_ty.sty, last_layout) {
|
2016-04-07 06:56:07 -05:00
|
|
|
(&ty::TyTuple(ref fields),
|
2016-04-23 01:03:59 -05:00
|
|
|
&Layout::Univariant { ref variant, .. }) => {
|
|
|
|
let offsets = iter::once(0)
|
|
|
|
.chain(variant.offset_after_field.iter()
|
|
|
|
.map(|s| s.bytes()));
|
|
|
|
for (offset, ty) in offsets.zip(fields) {
|
|
|
|
let src = last.offset(offset as isize);
|
2016-04-07 06:56:07 -05:00
|
|
|
arg_srcs.push((src, ty));
|
2016-03-18 11:48:31 -05:00
|
|
|
}
|
|
|
|
}
|
2016-04-07 06:56:07 -05:00
|
|
|
ty => panic!("expected tuple as last argument in function with 'rust-call' ABI, got {:?}", ty),
|
2016-03-18 11:48:31 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-30 23:04:53 -05:00
|
|
|
let mir = self.load_mir(resolved_def_id);
|
|
|
|
self.name_stack.push((def_id, substs, terminator.span));
|
|
|
|
self.push_stack_frame(mir, resolved_substs, return_ptr);
|
2016-03-18 11:48:31 -05:00
|
|
|
|
2016-04-07 06:56:07 -05:00
|
|
|
for (i, (src, src_ty)) in arg_srcs.into_iter().enumerate() {
|
2016-03-20 23:07:25 -05:00
|
|
|
let dest = self.frame().locals[i];
|
2016-05-09 19:52:44 -05:00
|
|
|
self.move_(src, dest, src_ty)?;
|
2016-03-18 11:48:31 -05:00
|
|
|
}
|
|
|
|
|
2016-03-15 01:45:25 -05:00
|
|
|
TerminatorTarget::Call
|
|
|
|
}
|
|
|
|
|
2016-03-20 19:41:39 -05:00
|
|
|
abi => panic!("can't handle function with {:?} ABI", abi),
|
2016-03-15 01:45:25 -05:00
|
|
|
}
|
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
|
|
|
|
2016-04-07 04:02:02 -05:00
|
|
|
Drop { ref value, target, .. } => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let ptr = self.eval_lvalue(value)?.to_ptr();
|
2016-04-07 04:02:02 -05:00
|
|
|
let ty = self.lvalue_ty(value);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.drop(ptr, ty)?;
|
2016-03-14 22:18:39 -05:00
|
|
|
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
|
|
|
}
|
|
|
|
|
2016-04-07 04:02:02 -05:00
|
|
|
fn drop(&mut self, ptr: Pointer, ty: ty::Ty<'tcx>) -> EvalResult<()> {
|
|
|
|
if !self.type_needs_drop(ty) {
|
|
|
|
self.log(1, || print!("no need to drop {:?}", ty));
|
|
|
|
return Ok(());
|
|
|
|
}
|
|
|
|
self.log(1, || print!("need to drop {:?}", ty));
|
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Call user-defined Drop::drop impls.
|
2016-04-07 06:56:07 -05:00
|
|
|
|
2016-04-07 04:02:02 -05:00
|
|
|
match ty.sty {
|
|
|
|
ty::TyBox(contents_ty) => {
|
2016-04-07 06:56:07 -05:00
|
|
|
match self.memory.read_ptr(ptr) {
|
|
|
|
Ok(contents_ptr) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
self.drop(contents_ptr, contents_ty)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
self.log(1, || print!("deallocating box"));
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.deallocate(contents_ptr)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
}
|
|
|
|
Err(EvalError::ReadBytesAsPointer) => {
|
2016-04-15 04:16:35 -05:00
|
|
|
let size = self.memory.pointer_size;
|
2016-05-09 19:52:44 -05:00
|
|
|
let possible_drop_fill = self.memory.read_bytes(ptr, size)?;
|
2016-04-15 04:16:35 -05:00
|
|
|
if possible_drop_fill.iter().all(|&b| b == mem::POST_DROP_U8) {
|
2016-04-07 06:56:07 -05:00
|
|
|
return Ok(());
|
|
|
|
} else {
|
|
|
|
return Err(EvalError::ReadBytesAsPointer);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
Err(e) => return Err(e),
|
|
|
|
}
|
2016-04-07 04:02:02 -05:00
|
|
|
}
|
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Implement drop for other relevant types (e.g. aggregates).
|
2016-04-07 04:02:02 -05:00
|
|
|
_ => {}
|
|
|
|
}
|
|
|
|
|
2016-04-07 06:56:07 -05:00
|
|
|
// Filling drop.
|
2016-05-09 21:08:37 -05:00
|
|
|
// FIXME(solson): Trait objects (with no static size) probably get filled, too.
|
2016-04-07 06:56:07 -05:00
|
|
|
let size = self.type_size(ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.drop_fill(ptr, size)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
|
2016-04-07 04:02:02 -05:00
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2016-04-07 03:02:30 -05:00
|
|
|
fn call_intrinsic(
|
|
|
|
&mut self,
|
|
|
|
name: &str,
|
|
|
|
substs: &'tcx Substs<'tcx>,
|
|
|
|
args: &[mir::Operand<'tcx>],
|
|
|
|
dest: Pointer,
|
|
|
|
dest_size: usize
|
|
|
|
) -> EvalResult<TerminatorTarget> {
|
|
|
|
let args_res: EvalResult<Vec<Pointer>> = args.iter()
|
|
|
|
.map(|arg| self.eval_operand(arg))
|
|
|
|
.collect();
|
2016-05-09 19:52:44 -05:00
|
|
|
let args = args_res?;
|
2016-04-07 03:02:30 -05:00
|
|
|
|
2016-03-17 07:00:27 -05:00
|
|
|
match name {
|
2016-03-19 00:04:07 -05:00
|
|
|
"assume" => {}
|
|
|
|
|
2016-03-18 12:52:28 -05:00
|
|
|
"copy_nonoverlapping" => {
|
|
|
|
let elem_ty = *substs.types.get(subst::FnSpace, 0);
|
2016-04-06 20:01:00 -05:00
|
|
|
let elem_size = self.type_size(elem_ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.memory.read_ptr(args[0])?;
|
|
|
|
let dest = self.memory.read_ptr(args[1])?;
|
|
|
|
let count = self.memory.read_isize(args[2])?;
|
|
|
|
self.memory.copy(src, dest, count as usize * elem_size)?;
|
2016-03-17 07:00:27 -05:00
|
|
|
}
|
|
|
|
|
2016-04-07 06:56:07 -05:00
|
|
|
"forget" => {
|
|
|
|
let arg_ty = *substs.types.get(subst::FnSpace, 0);
|
|
|
|
let arg_size = self.type_size(arg_ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.drop_fill(args[0], arg_size)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
}
|
|
|
|
|
2016-05-09 19:52:44 -05:00
|
|
|
"init" => self.memory.write_repeat(dest, 0, dest_size)?,
|
2016-03-18 12:52:28 -05:00
|
|
|
|
2016-03-19 12:01:33 -05:00
|
|
|
"min_align_of" => {
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_int(dest, 1, dest_size)?;
|
2016-03-19 12:01:33 -05:00
|
|
|
}
|
|
|
|
|
2016-03-20 20:23:57 -05:00
|
|
|
"move_val_init" => {
|
|
|
|
let ty = *substs.types.get(subst::FnSpace, 0);
|
2016-05-09 19:52:44 -05:00
|
|
|
let ptr = self.memory.read_ptr(args[0])?;
|
|
|
|
self.move_(args[1], ptr, ty)?;
|
2016-03-20 20:23:57 -05:00
|
|
|
}
|
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// FIXME(solson): Handle different integer types correctly.
|
2016-04-06 05:19:36 -05:00
|
|
|
"add_with_overflow" => {
|
|
|
|
let ty = *substs.types.get(subst::FnSpace, 0);
|
2016-04-06 20:01:00 -05:00
|
|
|
let size = self.type_size(ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
let left = self.memory.read_int(args[0], size)?;
|
|
|
|
let right = self.memory.read_int(args[1], size)?;
|
2016-04-06 05:19:36 -05:00
|
|
|
let (n, overflowed) = unsafe {
|
|
|
|
::std::intrinsics::add_with_overflow::<i64>(left, right)
|
|
|
|
};
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_int(dest, n, size)?;
|
|
|
|
self.memory.write_bool(dest.offset(size as isize), overflowed)?;
|
2016-04-06 05:19:36 -05:00
|
|
|
}
|
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// FIXME(solson): Handle different integer types correctly.
|
2016-03-19 12:01:33 -05:00
|
|
|
"mul_with_overflow" => {
|
|
|
|
let ty = *substs.types.get(subst::FnSpace, 0);
|
2016-04-06 20:01:00 -05:00
|
|
|
let size = self.type_size(ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
let left = self.memory.read_int(args[0], size)?;
|
|
|
|
let right = self.memory.read_int(args[1], size)?;
|
2016-03-19 12:01:33 -05:00
|
|
|
let (n, overflowed) = unsafe {
|
|
|
|
::std::intrinsics::mul_with_overflow::<i64>(left, right)
|
|
|
|
};
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_int(dest, n, size)?;
|
|
|
|
self.memory.write_bool(dest.offset(size as isize), overflowed)?;
|
2016-03-19 12:01:33 -05:00
|
|
|
}
|
|
|
|
|
2016-03-17 07:00:27 -05:00
|
|
|
"offset" => {
|
|
|
|
let pointee_ty = *substs.types.get(subst::FnSpace, 0);
|
2016-04-06 20:01:00 -05:00
|
|
|
let pointee_size = self.type_size(pointee_ty) as isize;
|
2016-04-07 03:02:30 -05:00
|
|
|
let ptr_arg = args[0];
|
2016-05-09 19:52:44 -05:00
|
|
|
let offset = self.memory.read_isize(args[1])?;
|
2016-03-18 12:53:24 -05:00
|
|
|
|
2016-03-19 10:09:13 -05:00
|
|
|
match self.memory.read_ptr(ptr_arg) {
|
|
|
|
Ok(ptr) => {
|
|
|
|
let result_ptr = ptr.offset(offset as isize * pointee_size);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_ptr(dest, result_ptr)?;
|
2016-03-19 10:09:13 -05:00
|
|
|
}
|
|
|
|
Err(EvalError::ReadBytesAsPointer) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let addr = self.memory.read_isize(ptr_arg)?;
|
2016-03-19 10:09:13 -05:00
|
|
|
let result_addr = addr + offset * pointee_size as i64;
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_isize(dest, result_addr)?;
|
2016-03-19 10:09:13 -05:00
|
|
|
}
|
|
|
|
Err(e) => return Err(e),
|
|
|
|
}
|
2016-03-17 07:00:27 -05:00
|
|
|
}
|
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// FIXME(solson): Handle different integer types correctly. Use primvals?
|
2016-03-21 04:42:34 -05:00
|
|
|
"overflowing_sub" => {
|
|
|
|
let ty = *substs.types.get(subst::FnSpace, 0);
|
2016-04-06 20:01:00 -05:00
|
|
|
let size = self.type_size(ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
let left = self.memory.read_int(args[0], size)?;
|
|
|
|
let right = self.memory.read_int(args[1], size)?;
|
2016-03-21 04:42:34 -05:00
|
|
|
let n = left.wrapping_sub(right);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_int(dest, n, size)?;
|
2016-03-21 04:42:34 -05:00
|
|
|
}
|
|
|
|
|
2016-03-18 12:52:28 -05:00
|
|
|
"size_of" => {
|
|
|
|
let ty = *substs.types.get(subst::FnSpace, 0);
|
2016-04-06 20:01:00 -05:00
|
|
|
let size = self.type_size(ty) as u64;
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_uint(dest, size, dest_size)?;
|
2016-03-18 12:52:28 -05:00
|
|
|
}
|
|
|
|
|
2016-04-07 06:56:07 -05:00
|
|
|
"transmute" => {
|
|
|
|
let ty = *substs.types.get(subst::FnSpace, 0);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.move_(args[0], dest, ty)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
}
|
2016-05-09 19:52:44 -05:00
|
|
|
"uninit" => self.memory.mark_definedness(dest, dest_size, false)?,
|
2016-03-18 12:52:28 -05:00
|
|
|
|
2016-03-17 07:00:27 -05:00
|
|
|
name => panic!("can't handle intrinsic: {}", name),
|
|
|
|
}
|
|
|
|
|
|
|
|
// 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.
|
|
|
|
Ok(TerminatorTarget::Call)
|
|
|
|
}
|
|
|
|
|
2016-04-07 03:02:30 -05:00
|
|
|
fn call_c_abi(
|
|
|
|
&mut self,
|
|
|
|
def_id: DefId,
|
|
|
|
args: &[mir::Operand<'tcx>],
|
|
|
|
dest: Pointer
|
|
|
|
) -> EvalResult<TerminatorTarget> {
|
2016-03-20 19:41:39 -05:00
|
|
|
let name = self.tcx.item_name(def_id);
|
|
|
|
let attrs = self.tcx.get_attrs(def_id);
|
|
|
|
let link_name = match attr::first_attr_value_str_by_name(&attrs, "link_name") {
|
|
|
|
Some(ln) => ln.clone(),
|
|
|
|
None => name.as_str(),
|
|
|
|
};
|
|
|
|
|
2016-04-07 03:02:30 -05:00
|
|
|
let args_res: EvalResult<Vec<Pointer>> = args.iter()
|
|
|
|
.map(|arg| self.eval_operand(arg))
|
|
|
|
.collect();
|
2016-05-09 19:52:44 -05:00
|
|
|
let args = args_res?;
|
2016-04-07 03:02:30 -05:00
|
|
|
|
2016-03-20 19:41:39 -05:00
|
|
|
match &link_name[..] {
|
|
|
|
"__rust_allocate" => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let size = self.memory.read_usize(args[0])?;
|
2016-03-20 19:41:39 -05:00
|
|
|
let ptr = self.memory.allocate(size as usize);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_ptr(dest, ptr)?;
|
2016-03-20 19:41:39 -05:00
|
|
|
}
|
|
|
|
|
2016-04-06 18:29:56 -05:00
|
|
|
"__rust_reallocate" => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let ptr = self.memory.read_ptr(args[0])?;
|
|
|
|
let size = self.memory.read_usize(args[2])?;
|
|
|
|
self.memory.reallocate(ptr, size as usize)?;
|
|
|
|
self.memory.write_ptr(dest, ptr)?;
|
2016-04-06 18:29:56 -05:00
|
|
|
}
|
|
|
|
|
2016-03-20 19:41:39 -05:00
|
|
|
_ => panic!("can't call C ABI function: {}", link_name),
|
|
|
|
}
|
|
|
|
|
|
|
|
// 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.
|
|
|
|
Ok(TerminatorTarget::Call)
|
|
|
|
}
|
|
|
|
|
2016-04-23 01:03:59 -05:00
|
|
|
fn assign_fields<I: IntoIterator<Item = u64>>(
|
2016-03-28 22:08:08 -05:00
|
|
|
&mut self,
|
|
|
|
dest: Pointer,
|
2016-04-23 01:03:59 -05:00
|
|
|
offsets: I,
|
2016-03-28 22:08:08 -05:00
|
|
|
operands: &[mir::Operand<'tcx>],
|
|
|
|
) -> EvalResult<()> {
|
2016-04-23 01:03:59 -05:00
|
|
|
for (offset, operand) in offsets.into_iter().zip(operands) {
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.eval_operand(operand)?;
|
2016-04-23 01:03:59 -05:00
|
|
|
let src_ty = self.operand_ty(operand);
|
|
|
|
let field_dest = dest.offset(offset as isize);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.move_(src, field_dest, src_ty)?;
|
2016-03-12 22:15:59 -06:00
|
|
|
}
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2016-03-07 07:10:52 -06:00
|
|
|
fn eval_assignment(&mut self, lvalue: &mir::Lvalue<'tcx>, rvalue: &mir::Rvalue<'tcx>)
|
|
|
|
-> EvalResult<()>
|
|
|
|
{
|
2016-05-09 19:52:44 -05:00
|
|
|
let dest = self.eval_lvalue(lvalue)?.to_ptr();
|
2016-04-07 06:56:07 -05:00
|
|
|
let dest_ty = self.lvalue_ty(lvalue);
|
2016-04-30 00:32:15 -05:00
|
|
|
let dest_layout = self.type_layout(dest_ty);
|
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) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.eval_operand(operand)?;
|
|
|
|
self.move_(src, dest, dest_ty)?;
|
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) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let left_ptr = self.eval_operand(left)?;
|
2016-03-17 03:53:03 -05:00
|
|
|
let left_ty = self.operand_ty(left);
|
2016-05-09 19:52:44 -05:00
|
|
|
let left_val = self.read_primval(left_ptr, left_ty)?;
|
2016-03-17 03:53:03 -05:00
|
|
|
|
2016-05-09 19:52:44 -05:00
|
|
|
let right_ptr = self.eval_operand(right)?;
|
2016-03-17 03:53:03 -05:00
|
|
|
let right_ty = self.operand_ty(right);
|
2016-05-09 19:52:44 -05:00
|
|
|
let right_val = self.read_primval(right_ptr, right_ty)?;
|
2016-03-17 03:53:03 -05:00
|
|
|
|
2016-05-09 19:52:44 -05:00
|
|
|
let val = primval::binary_op(bin_op, left_val, right_val)?;
|
|
|
|
self.memory.write_primval(dest, val)?;
|
2016-03-13 01:43:28 -06:00
|
|
|
}
|
2016-03-07 07:10:52 -06:00
|
|
|
|
2016-03-07 07:57:08 -06:00
|
|
|
UnaryOp(un_op, ref operand) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let ptr = self.eval_operand(operand)?;
|
2016-03-17 03:53:03 -05:00
|
|
|
let ty = self.operand_ty(operand);
|
2016-05-09 19:52:44 -05:00
|
|
|
let val = self.read_primval(ptr, ty)?;
|
|
|
|
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) => {
|
2016-05-08 20:29:00 -05:00
|
|
|
use rustc::ty::layout::Layout::*;
|
2016-04-23 01:03:59 -05:00
|
|
|
match *dest_layout {
|
2016-05-08 20:29:00 -05:00
|
|
|
Univariant { ref variant, .. } => {
|
2016-04-23 01:03:59 -05:00
|
|
|
let offsets = iter::once(0)
|
|
|
|
.chain(variant.offset_after_field.iter().map(|s| s.bytes()));
|
2016-05-09 19:52:44 -05:00
|
|
|
self.assign_fields(dest, offsets, operands)?;
|
2016-04-23 01:03:59 -05:00
|
|
|
}
|
|
|
|
|
2016-05-08 20:29:00 -05:00
|
|
|
Array { .. } => {
|
2016-04-23 01:03:59 -05:00
|
|
|
let elem_size = match dest_ty.sty {
|
|
|
|
ty::TyArray(elem_ty, _) => self.type_size(elem_ty) as u64,
|
2016-04-30 02:04:17 -05:00
|
|
|
_ => panic!("tried to assign {:?} to non-array type {:?}",
|
2016-04-23 01:03:59 -05:00
|
|
|
kind, dest_ty),
|
|
|
|
};
|
|
|
|
let offsets = (0..).map(|i| i * elem_size);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.assign_fields(dest, offsets, operands)?;
|
2016-03-28 22:08:08 -05:00
|
|
|
}
|
2016-03-21 00:09:27 -05:00
|
|
|
|
2016-05-08 20:29:00 -05:00
|
|
|
General { discr, ref variants, .. } => {
|
2016-04-23 01:03:59 -05:00
|
|
|
if let mir::AggregateKind::Adt(adt_def, variant, _) = *kind {
|
|
|
|
let discr_val = adt_def.variants[variant].disr_val.to_u64_unchecked();
|
|
|
|
let discr_size = discr.size().bytes() as usize;
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_uint(dest, discr_val, discr_size)?;
|
2016-04-23 01:03:59 -05:00
|
|
|
|
|
|
|
let offsets = variants[variant].offset_after_field.iter()
|
|
|
|
.map(|s| s.bytes());
|
2016-05-09 19:52:44 -05:00
|
|
|
self.assign_fields(dest, offsets, operands)?;
|
2016-04-23 01:03:59 -05:00
|
|
|
} else {
|
2016-04-30 02:04:17 -05:00
|
|
|
panic!("tried to assign {:?} to Layout::General", kind);
|
2016-03-15 06:50:53 -05:00
|
|
|
}
|
2016-04-30 02:04:17 -05:00
|
|
|
}
|
|
|
|
|
2016-05-08 20:29:00 -05:00
|
|
|
RawNullablePointer { nndiscr, .. } => {
|
2016-04-30 02:04:17 -05:00
|
|
|
if let mir::AggregateKind::Adt(_, variant, _) = *kind {
|
|
|
|
if nndiscr == variant as u64 {
|
|
|
|
assert_eq!(operands.len(), 1);
|
|
|
|
let operand = &operands[0];
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.eval_operand(operand)?;
|
2016-04-30 02:04:17 -05:00
|
|
|
let src_ty = self.operand_ty(operand);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.move_(src, dest, src_ty)?;
|
2016-04-30 02:04:17 -05:00
|
|
|
} else {
|
|
|
|
assert_eq!(operands.len(), 0);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_isize(dest, 0)?;
|
2016-04-30 02:04:17 -05:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
panic!("tried to assign {:?} to Layout::RawNullablePointer", kind);
|
2016-03-15 06:50:53 -05:00
|
|
|
}
|
2016-04-23 01:03:59 -05:00
|
|
|
}
|
|
|
|
|
2016-05-08 20:49:07 -05:00
|
|
|
CEnum { discr, signed, .. } => {
|
2016-05-08 20:29:00 -05:00
|
|
|
assert_eq!(operands.len(), 0);
|
|
|
|
if let mir::AggregateKind::Adt(adt_def, variant, _) = *kind {
|
2016-05-08 20:49:07 -05:00
|
|
|
let val = adt_def.variants[variant].disr_val.to_u64_unchecked();
|
|
|
|
let size = discr.size().bytes() as usize;
|
|
|
|
|
2016-05-08 20:29:00 -05:00
|
|
|
if signed {
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_int(dest, val as i64, size)?;
|
2016-05-08 20:29:00 -05:00
|
|
|
} else {
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_uint(dest, val, size)?;
|
2016-05-08 20:29:00 -05:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
panic!("tried to assign {:?} to Layout::CEnum", kind);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-04-23 01:03:59 -05:00
|
|
|
_ => panic!("can't handle destination layout {:?} when assigning {:?}",
|
|
|
|
dest_layout, kind),
|
2016-03-12 22:15:59 -06:00
|
|
|
}
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
2015-11-12 17:24:43 -06:00
|
|
|
|
2016-03-21 04:34:24 -05:00
|
|
|
Repeat(ref operand, _) => {
|
2016-04-23 01:03:59 -05:00
|
|
|
let (elem_size, length) = match dest_ty.sty {
|
|
|
|
ty::TyArray(elem_ty, n) => (self.type_size(elem_ty), n),
|
|
|
|
_ => panic!("tried to assign array-repeat to non-array type {:?}", dest_ty),
|
|
|
|
};
|
|
|
|
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.eval_operand(operand)?;
|
2016-04-23 01:03:59 -05:00
|
|
|
for i in 0..length {
|
|
|
|
let elem_dest = dest.offset((i * elem_size) as isize);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.copy(src, elem_dest, elem_size)?;
|
2016-03-21 04:34:24 -05:00
|
|
|
}
|
|
|
|
}
|
2016-03-21 04:19:48 -05:00
|
|
|
|
2016-03-20 22:30:31 -05:00
|
|
|
Len(ref lvalue) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.eval_lvalue(lvalue)?;
|
2016-03-20 22:30:31 -05:00
|
|
|
let ty = self.lvalue_ty(lvalue);
|
2016-03-20 23:59:13 -05:00
|
|
|
let len = match ty.sty {
|
|
|
|
ty::TyArray(_, n) => n as u64,
|
|
|
|
ty::TySlice(_) => if let LvalueExtra::Length(n) = src.extra {
|
|
|
|
n
|
|
|
|
} else {
|
|
|
|
panic!("Rvalue::Len of a slice given non-slice pointer: {:?}", src);
|
|
|
|
},
|
2016-03-20 22:30:31 -05:00
|
|
|
_ => panic!("Rvalue::Len expected array or slice, got {:?}", ty),
|
2016-03-20 23:59:13 -05:00
|
|
|
};
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_usize(dest, len)?;
|
2016-03-20 22:30:31 -05:00
|
|
|
}
|
|
|
|
|
2016-03-13 15:36:25 -05:00
|
|
|
Ref(_, _, ref lvalue) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let lv = self.eval_lvalue(lvalue)?;
|
|
|
|
self.memory.write_ptr(dest, lv.ptr)?;
|
2016-03-20 23:59:13 -05:00
|
|
|
match lv.extra {
|
|
|
|
LvalueExtra::None => {},
|
|
|
|
LvalueExtra::Length(len) => {
|
2016-03-21 00:24:27 -05:00
|
|
|
let len_ptr = dest.offset(self.memory.pointer_size as isize);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_usize(len_ptr, len)?;
|
2016-03-20 23:59:13 -05:00
|
|
|
}
|
2016-04-30 00:32:15 -05:00
|
|
|
LvalueExtra::DowncastVariant(..) =>
|
|
|
|
panic!("attempted to take a reference to an enum downcast lvalue"),
|
2016-03-20 23:59:13 -05:00
|
|
|
}
|
2016-03-13 15:36:25 -05:00
|
|
|
}
|
2015-12-28 22:24:05 -06:00
|
|
|
|
2016-03-14 23:05:50 -05:00
|
|
|
Box(ty) => {
|
2016-04-06 20:01:00 -05:00
|
|
|
let size = self.type_size(ty);
|
2016-03-17 04:19:13 -05:00
|
|
|
let ptr = self.memory.allocate(size);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_ptr(dest, ptr)?;
|
2016-03-14 23:05:50 -05:00
|
|
|
}
|
|
|
|
|
2016-03-17 00:28:49 -05:00
|
|
|
Cast(kind, ref operand, dest_ty) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let src = self.eval_operand(operand)?;
|
2016-03-18 11:48:31 -05:00
|
|
|
let src_ty = self.operand_ty(operand);
|
2016-03-17 00:28:49 -05:00
|
|
|
|
|
|
|
use rustc::mir::repr::CastKind::*;
|
|
|
|
match kind {
|
|
|
|
Unsize => {
|
2016-05-09 19:52:44 -05:00
|
|
|
self.move_(src, dest, src_ty)?;
|
2016-03-17 00:28:49 -05:00
|
|
|
let src_pointee_ty = pointee_type(src_ty).unwrap();
|
|
|
|
let dest_pointee_ty = pointee_type(dest_ty).unwrap();
|
|
|
|
|
|
|
|
match (&src_pointee_ty.sty, &dest_pointee_ty.sty) {
|
2016-03-17 09:01:34 -05:00
|
|
|
(&ty::TyArray(_, length), &ty::TySlice(_)) => {
|
2016-03-21 00:24:27 -05:00
|
|
|
let len_ptr = dest.offset(self.memory.pointer_size as isize);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_usize(len_ptr, length as u64)?;
|
2016-03-17 09:01:34 -05:00
|
|
|
}
|
2016-03-17 00:28:49 -05:00
|
|
|
|
|
|
|
_ => panic!("can't handle cast: {:?}", rvalue),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
Misc => {
|
2016-05-09 21:08:37 -05:00
|
|
|
// FIXME(solson): Wrong for almost everything.
|
2016-04-23 01:03:59 -05:00
|
|
|
let size = dest_layout.size(&self.tcx.data_layout).bytes() as usize;
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.copy(src, dest, size)?;
|
2016-03-17 00:28:49 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
_ => panic!("can't handle cast: {:?}", rvalue),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-21 04:19:48 -05:00
|
|
|
Slice { .. } => unimplemented!(),
|
2016-03-28 18:43:23 -05:00
|
|
|
InlineAsm { .. } => unimplemented!(),
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
2016-03-21 00:09:27 -05:00
|
|
|
|
|
|
|
Ok(())
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
|
|
|
|
2016-03-17 00:28:09 -05:00
|
|
|
fn eval_operand(&mut self, op: &mir::Operand<'tcx>) -> EvalResult<Pointer> {
|
2016-03-07 03:32:02 -06:00
|
|
|
use rustc::mir::repr::Operand::*;
|
2015-11-12 15:50:58 -06:00
|
|
|
match *op {
|
2016-05-09 19:52:44 -05:00
|
|
|
Consume(ref lvalue) => Ok(self.eval_lvalue(lvalue)?.to_ptr()),
|
2016-04-30 00:32:15 -05:00
|
|
|
Constant(mir::Constant { ref literal, .. }) => {
|
2016-03-07 03:32:02 -06:00
|
|
|
use rustc::mir::repr::Literal::*;
|
2016-03-13 01:14:20 -06:00
|
|
|
match *literal {
|
2016-05-09 19:52:44 -05:00
|
|
|
Value { ref value } => Ok(self.const_to_ptr(value)?),
|
2016-03-21 05:01:52 -05:00
|
|
|
Item { .. } => unimplemented!(),
|
2016-05-09 19:21:21 -05:00
|
|
|
Promoted { index } => {
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Mark constants and statics as read-only and cache their
|
2016-05-09 21:03:13 -05:00
|
|
|
// values.
|
2016-05-09 19:21:21 -05:00
|
|
|
let current_mir = self.mir();
|
|
|
|
let mir = ¤t_mir.promoted[index];
|
|
|
|
self.call_nested(mir).map(Option::unwrap)
|
|
|
|
}
|
2015-11-12 15:50:58 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2015-11-12 17:44:29 -06:00
|
|
|
|
2016-03-20 23:59:13 -05:00
|
|
|
fn eval_lvalue(&mut self, lvalue: &mir::Lvalue<'tcx>) -> EvalResult<Lvalue> {
|
2016-03-07 07:48:38 -06:00
|
|
|
use rustc::mir::repr::Lvalue::*;
|
|
|
|
let ptr = match *lvalue {
|
2016-03-20 23:07:25 -05:00
|
|
|
ReturnPointer => self.frame().return_ptr
|
2016-03-20 22:30:31 -05:00
|
|
|
.expect("ReturnPointer used in a function with no return value"),
|
2016-03-20 23:07:25 -05:00
|
|
|
Arg(i) => self.frame().locals[i as usize],
|
|
|
|
Var(i) => self.frame().locals[self.frame().var_offset + i as usize],
|
|
|
|
Temp(i) => self.frame().locals[self.frame().temp_offset + i as usize],
|
2016-03-13 07:48:04 -05:00
|
|
|
|
2016-05-09 21:03:13 -05:00
|
|
|
Static(def_id) => {
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Mark constants and statics as read-only and cache their values.
|
2016-05-09 21:03:13 -05:00
|
|
|
let mir = self.load_mir(def_id);
|
|
|
|
self.call_nested(&mir)?.unwrap()
|
|
|
|
}
|
2016-03-21 05:01:52 -05:00
|
|
|
|
2016-03-13 07:48:04 -05:00
|
|
|
Projection(ref proj) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
let base = self.eval_lvalue(&proj.base)?;
|
2016-03-20 23:59:13 -05:00
|
|
|
let base_ty = self.lvalue_ty(&proj.base);
|
2016-04-30 00:32:15 -05:00
|
|
|
let base_layout = self.type_layout(base_ty);
|
2016-04-23 01:03:59 -05:00
|
|
|
|
2016-03-13 07:48:04 -05:00
|
|
|
use rustc::mir::repr::ProjectionElem::*;
|
|
|
|
match proj.elem {
|
2016-04-30 00:32:15 -05:00
|
|
|
Field(field, _) => {
|
|
|
|
let variant = match *base_layout {
|
|
|
|
Layout::Univariant { ref variant, .. } => variant,
|
|
|
|
Layout::General { ref variants, .. } => {
|
|
|
|
if let LvalueExtra::DowncastVariant(variant_idx) = base.extra {
|
|
|
|
&variants[variant_idx]
|
|
|
|
} else {
|
|
|
|
panic!("field access on enum had no variant index");
|
|
|
|
}
|
|
|
|
}
|
2016-04-30 02:04:17 -05:00
|
|
|
Layout::RawNullablePointer { .. } => {
|
|
|
|
assert_eq!(field.index(), 0);
|
|
|
|
return Ok(base);
|
|
|
|
}
|
2016-04-30 00:32:15 -05:00
|
|
|
_ => panic!("field access on non-product type: {:?}", base_layout),
|
|
|
|
};
|
|
|
|
|
|
|
|
let offset = variant.field_offset(field.index()).bytes();
|
|
|
|
base.ptr.offset(offset as isize)
|
2016-03-13 08:23:48 -05:00
|
|
|
},
|
|
|
|
|
2016-04-30 00:32:15 -05:00
|
|
|
Downcast(_, variant) => match *base_layout {
|
|
|
|
Layout::General { discr, .. } => {
|
|
|
|
return Ok(Lvalue {
|
|
|
|
ptr: base.ptr.offset(discr.size().bytes() as isize),
|
|
|
|
extra: LvalueExtra::DowncastVariant(variant),
|
|
|
|
});
|
|
|
|
}
|
2016-04-30 02:04:17 -05:00
|
|
|
Layout::RawNullablePointer { .. } => return Ok(base),
|
2016-04-23 01:03:59 -05:00
|
|
|
_ => panic!("variant downcast on non-aggregate type: {:?}", base_layout),
|
2016-03-13 07:48:04 -05:00
|
|
|
},
|
|
|
|
|
2016-03-20 23:59:13 -05:00
|
|
|
Deref => {
|
|
|
|
let pointee_ty = pointee_type(base_ty).expect("Deref of non-pointer");
|
2016-05-09 19:52:44 -05:00
|
|
|
let ptr = self.memory.read_ptr(base.ptr)?;
|
2016-03-20 23:59:13 -05:00
|
|
|
let extra = match pointee_ty.sty {
|
2016-03-27 00:57:14 -05:00
|
|
|
ty::TySlice(_) | ty::TyStr => {
|
2016-04-30 00:32:15 -05:00
|
|
|
let len_ptr = base.ptr.offset(self.memory.pointer_size as isize);
|
2016-05-09 19:52:44 -05:00
|
|
|
let len = self.memory.read_usize(len_ptr)?;
|
2016-03-20 23:59:13 -05:00
|
|
|
LvalueExtra::Length(len)
|
|
|
|
}
|
|
|
|
ty::TyTrait(_) => unimplemented!(),
|
|
|
|
_ => LvalueExtra::None,
|
|
|
|
};
|
|
|
|
return Ok(Lvalue { ptr: ptr, extra: extra });
|
|
|
|
}
|
2016-03-13 15:36:25 -05:00
|
|
|
|
2016-03-20 22:30:31 -05:00
|
|
|
Index(ref operand) => {
|
|
|
|
let elem_size = match base_ty.sty {
|
2016-04-28 23:01:17 -05:00
|
|
|
ty::TyArray(elem_ty, _) |
|
2016-04-06 20:01:00 -05:00
|
|
|
ty::TySlice(elem_ty) => self.type_size(elem_ty),
|
2016-03-20 22:30:31 -05:00
|
|
|
_ => panic!("indexing expected an array or slice, got {:?}", base_ty),
|
|
|
|
};
|
2016-05-09 19:52:44 -05:00
|
|
|
let n_ptr = self.eval_operand(operand)?;
|
|
|
|
let n = self.memory.read_usize(n_ptr)?;
|
2016-04-30 00:32:15 -05:00
|
|
|
base.ptr.offset(n as isize * elem_size as isize)
|
2016-03-20 22:30:31 -05:00
|
|
|
}
|
|
|
|
|
2016-03-21 05:01:52 -05:00
|
|
|
ConstantIndex { .. } => unimplemented!(),
|
2016-03-13 07:48:04 -05:00
|
|
|
}
|
|
|
|
}
|
2016-03-07 07:48:38 -06:00
|
|
|
};
|
|
|
|
|
2016-03-20 23:59:13 -05:00
|
|
|
Ok(Lvalue { ptr: ptr, extra: LvalueExtra::None })
|
2016-03-07 07:48:38 -06:00
|
|
|
}
|
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Try making const_to_primval instead.
|
2016-03-31 23:34:07 -05:00
|
|
|
fn const_to_ptr(&mut self, const_val: &const_val::ConstVal) -> EvalResult<Pointer> {
|
|
|
|
use rustc::middle::const_val::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) => {
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Check int constant type.
|
2016-03-12 23:15:53 -06:00
|
|
|
let ptr = self.memory.allocate(8);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_uint(ptr, int.to_u64_unchecked(), 8)?;
|
2016-03-15 01:45:25 -05:00
|
|
|
Ok(ptr)
|
|
|
|
}
|
2016-03-19 00:19:39 -05:00
|
|
|
Str(ref s) => {
|
|
|
|
let psize = self.memory.pointer_size;
|
|
|
|
let static_ptr = self.memory.allocate(s.len());
|
|
|
|
let ptr = self.memory.allocate(psize * 2);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_bytes(static_ptr, s.as_bytes())?;
|
|
|
|
self.memory.write_ptr(ptr, static_ptr)?;
|
|
|
|
self.memory.write_usize(ptr.offset(psize as isize), s.len() as u64)?;
|
2016-03-19 00:19:39 -05:00
|
|
|
Ok(ptr)
|
|
|
|
}
|
2016-03-19 00:20:59 -05:00
|
|
|
ByteStr(ref bs) => {
|
|
|
|
let psize = self.memory.pointer_size;
|
|
|
|
let static_ptr = self.memory.allocate(bs.len());
|
|
|
|
let ptr = self.memory.allocate(psize);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.write_bytes(static_ptr, bs)?;
|
|
|
|
self.memory.write_ptr(ptr, static_ptr)?;
|
2016-03-19 00:20:59 -05:00
|
|
|
Ok(ptr)
|
|
|
|
}
|
2016-03-07 04:44:03 -06:00
|
|
|
Bool(b) => {
|
2016-03-17 04:19:13 -05:00
|
|
|
let ptr = self.memory.allocate(1);
|
2016-05-09 19:52:44 -05:00
|
|
|
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
|
|
|
|
2016-03-20 22:30:31 -05:00
|
|
|
fn lvalue_ty(&self, lvalue: &mir::Lvalue<'tcx>) -> ty::Ty<'tcx> {
|
2016-03-21 00:11:06 -05:00
|
|
|
self.monomorphize(self.mir().lvalue_ty(self.tcx, lvalue).to_ty(self.tcx))
|
|
|
|
}
|
|
|
|
|
|
|
|
fn operand_ty(&self, operand: &mir::Operand<'tcx>) -> ty::Ty<'tcx> {
|
|
|
|
self.monomorphize(self.mir().operand_ty(self.tcx, operand))
|
2016-03-20 22:30:31 -05:00
|
|
|
}
|
|
|
|
|
2016-03-18 12:52:13 -05:00
|
|
|
fn monomorphize(&self, ty: ty::Ty<'tcx>) -> ty::Ty<'tcx> {
|
2016-03-20 23:07:25 -05:00
|
|
|
let substituted = ty.subst(self.tcx, self.substs());
|
2016-03-18 12:52:13 -05:00
|
|
|
infer::normalize_associated_type(self.tcx, &substituted)
|
|
|
|
}
|
|
|
|
|
2016-04-07 04:02:02 -05:00
|
|
|
fn type_needs_drop(&self, ty: ty::Ty<'tcx>) -> bool {
|
|
|
|
self.tcx.type_needs_drop_given_env(ty, &self.tcx.empty_parameter_environment())
|
|
|
|
}
|
|
|
|
|
2016-04-07 06:56:07 -05:00
|
|
|
fn move_(&mut self, src: Pointer, dest: Pointer, ty: ty::Ty<'tcx>) -> EvalResult<()> {
|
|
|
|
let size = self.type_size(ty);
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.copy(src, dest, size)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
if self.type_needs_drop(ty) {
|
2016-05-09 19:52:44 -05:00
|
|
|
self.memory.drop_fill(src, size)?;
|
2016-04-07 06:56:07 -05:00
|
|
|
}
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2016-03-19 00:03:46 -05:00
|
|
|
fn type_is_sized(&self, ty: ty::Ty<'tcx>) -> bool {
|
|
|
|
ty.is_sized(&self.tcx.empty_parameter_environment(), DUMMY_SP)
|
|
|
|
}
|
|
|
|
|
2016-04-06 20:01:00 -05:00
|
|
|
fn type_size(&self, ty: ty::Ty<'tcx>) -> usize {
|
2016-04-23 01:03:59 -05:00
|
|
|
self.type_layout(ty).size(&self.tcx.data_layout).bytes() as usize
|
2016-03-13 08:23:48 -05:00
|
|
|
}
|
|
|
|
|
2016-04-23 01:03:59 -05:00
|
|
|
fn type_layout(&self, ty: ty::Ty<'tcx>) -> &'tcx Layout {
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Is this inefficient? Needs investigation.
|
2016-03-18 12:52:13 -05:00
|
|
|
let ty = self.monomorphize(ty);
|
2016-03-17 06:32:00 -05:00
|
|
|
|
2016-04-23 01:03:59 -05:00
|
|
|
let infcx = infer::normalizing_infer_ctxt(self.tcx, &self.tcx.tables, ProjectionMode::Any);
|
2016-03-17 06:49:12 -05:00
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Report this error properly.
|
2016-04-23 01:03:59 -05:00
|
|
|
ty.layout(&infcx).unwrap()
|
2016-03-17 06:49:12 -05:00
|
|
|
}
|
|
|
|
|
2016-03-19 00:03:46 -05:00
|
|
|
pub fn read_primval(&mut self, ptr: Pointer, ty: ty::Ty<'tcx>) -> EvalResult<PrimVal> {
|
|
|
|
use syntax::ast::{IntTy, UintTy};
|
|
|
|
let val = match ty.sty {
|
2016-05-09 19:52:44 -05:00
|
|
|
ty::TyBool => PrimVal::Bool(self.memory.read_bool(ptr)?),
|
|
|
|
ty::TyInt(IntTy::I8) => PrimVal::I8(self.memory.read_int(ptr, 1)? as i8),
|
|
|
|
ty::TyInt(IntTy::I16) => PrimVal::I16(self.memory.read_int(ptr, 2)? as i16),
|
|
|
|
ty::TyInt(IntTy::I32) => PrimVal::I32(self.memory.read_int(ptr, 4)? as i32),
|
|
|
|
ty::TyInt(IntTy::I64) => PrimVal::I64(self.memory.read_int(ptr, 8)? as i64),
|
|
|
|
ty::TyUint(UintTy::U8) => PrimVal::U8(self.memory.read_uint(ptr, 1)? as u8),
|
|
|
|
ty::TyUint(UintTy::U16) => PrimVal::U16(self.memory.read_uint(ptr, 2)? as u16),
|
|
|
|
ty::TyUint(UintTy::U32) => PrimVal::U32(self.memory.read_uint(ptr, 4)? as u32),
|
|
|
|
ty::TyUint(UintTy::U64) => PrimVal::U64(self.memory.read_uint(ptr, 8)? as u64),
|
2016-03-19 00:03:46 -05:00
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Pick the PrimVal dynamically.
|
2016-05-09 19:52:44 -05:00
|
|
|
ty::TyInt(IntTy::Is) => PrimVal::I64(self.memory.read_isize(ptr)?),
|
|
|
|
ty::TyUint(UintTy::Us) => PrimVal::U64(self.memory.read_usize(ptr)?),
|
2016-03-19 00:03:46 -05:00
|
|
|
|
|
|
|
ty::TyRef(_, ty::TypeAndMut { ty, .. }) |
|
|
|
|
ty::TyRawPtr(ty::TypeAndMut { ty, .. }) => {
|
|
|
|
if self.type_is_sized(ty) {
|
|
|
|
match self.memory.read_ptr(ptr) {
|
|
|
|
Ok(p) => PrimVal::AbstractPtr(p),
|
|
|
|
Err(EvalError::ReadBytesAsPointer) => {
|
2016-05-09 19:52:44 -05:00
|
|
|
PrimVal::IntegerPtr(self.memory.read_usize(ptr)?)
|
2016-03-19 00:03:46 -05:00
|
|
|
}
|
|
|
|
Err(e) => return Err(e),
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
panic!("unimplemented: primitive read of fat pointer type: {:?}", ty);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
_ => panic!("primitive read of non-primitive type: {:?}", ty),
|
|
|
|
};
|
|
|
|
Ok(val)
|
|
|
|
}
|
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
fn frame(&self) -> &Frame<'mir, 'tcx> {
|
2016-03-07 07:10:52 -06:00
|
|
|
self.stack.last().expect("no call frames exist")
|
|
|
|
}
|
2016-03-14 21:39:51 -05:00
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
fn frame_mut(&mut self) -> &mut Frame<'mir, 'tcx> {
|
2016-03-14 21:39:51 -05:00
|
|
|
self.stack.last_mut().expect("no call frames exist")
|
|
|
|
}
|
2015-11-12 15:50:58 -06:00
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
fn mir(&self) -> CachedMir<'mir, 'tcx> {
|
|
|
|
self.frame().mir.clone()
|
2016-03-20 23:07:25 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
fn substs(&self) -> &'tcx Substs<'tcx> {
|
2016-03-14 23:26:39 -05:00
|
|
|
self.substs_stack.last().cloned().unwrap_or_else(|| self.tcx.mk_substs(Substs::empty()))
|
|
|
|
}
|
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
fn load_mir(&self, def_id: DefId) -> CachedMir<'mir, 'tcx> {
|
2016-03-14 22:48:00 -05:00
|
|
|
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
|
|
|
let cs = &self.tcx.sess.cstore;
|
2016-03-18 13:11:39 -05:00
|
|
|
let mir = cs.maybe_get_item_mir(self.tcx, def_id).unwrap_or_else(|| {
|
|
|
|
panic!("no mir for {:?}", def_id);
|
|
|
|
});
|
2016-03-14 22:48:00 -05:00
|
|
|
let cached = Rc::new(mir);
|
|
|
|
mir_cache.insert(def_id, cached.clone());
|
|
|
|
CachedMir::Owned(cached)
|
|
|
|
}
|
|
|
|
}
|
2016-03-14 22:18:39 -05:00
|
|
|
}
|
2016-03-17 00:28:49 -05:00
|
|
|
|
|
|
|
fn fulfill_obligation(&self, trait_ref: ty::PolyTraitRef<'tcx>) -> traits::Vtable<'tcx, ()> {
|
|
|
|
// Do the initial selection for the obligation. This yields the shallow result we are
|
|
|
|
// looking for -- that is, what specific impl.
|
2016-03-28 18:43:23 -05:00
|
|
|
let infcx = infer::normalizing_infer_ctxt(self.tcx, &self.tcx.tables, ProjectionMode::Any);
|
2016-03-17 00:28:49 -05:00
|
|
|
let mut selcx = traits::SelectionContext::new(&infcx);
|
|
|
|
|
|
|
|
let obligation = traits::Obligation::new(
|
|
|
|
traits::ObligationCause::misc(DUMMY_SP, ast::DUMMY_NODE_ID),
|
|
|
|
trait_ref.to_poly_trait_predicate(),
|
|
|
|
);
|
|
|
|
let selection = selcx.select(&obligation).unwrap().unwrap();
|
|
|
|
|
|
|
|
// Currently, we use a fulfillment context to completely resolve all nested obligations.
|
|
|
|
// This is because they can inform the inference of the impl's type parameters.
|
|
|
|
let mut fulfill_cx = traits::FulfillmentContext::new();
|
|
|
|
let vtable = selection.map(|predicate| {
|
|
|
|
fulfill_cx.register_predicate_obligation(&infcx, predicate);
|
|
|
|
});
|
2016-04-28 23:01:17 -05:00
|
|
|
infer::drain_fulfillment_cx_or_panic(
|
2016-03-17 00:28:49 -05:00
|
|
|
DUMMY_SP, &infcx, &mut fulfill_cx, &vtable
|
2016-04-28 23:01:17 -05:00
|
|
|
)
|
2016-03-17 00:28:49 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
/// Trait method, which has to be resolved to an impl method.
|
|
|
|
pub fn trait_method(&self, def_id: DefId, substs: &'tcx Substs<'tcx>)
|
2016-03-28 18:43:23 -05:00
|
|
|
-> (DefId, &'tcx Substs<'tcx>)
|
|
|
|
{
|
2016-03-17 00:28:49 -05:00
|
|
|
let method_item = self.tcx.impl_or_trait_item(def_id);
|
|
|
|
let trait_id = method_item.container().id();
|
|
|
|
let trait_ref = ty::Binder(substs.to_trait_ref(self.tcx, trait_id));
|
|
|
|
match self.fulfill_obligation(trait_ref) {
|
|
|
|
traits::VtableImpl(vtable_impl) => {
|
|
|
|
let impl_did = vtable_impl.impl_def_id;
|
|
|
|
let mname = self.tcx.item_name(def_id);
|
2016-03-18 11:48:31 -05:00
|
|
|
// Create a concatenated set of substitutions which includes those from the impl
|
|
|
|
// and those from the method:
|
|
|
|
let impl_substs = vtable_impl.substs.with_method_from(substs);
|
2016-03-17 00:28:49 -05:00
|
|
|
let substs = self.tcx.mk_substs(impl_substs);
|
2016-03-28 18:43:23 -05:00
|
|
|
let mth = get_impl_method(self.tcx, impl_did, substs, mname);
|
2016-03-17 00:28:49 -05:00
|
|
|
|
|
|
|
(mth.method.def_id, mth.substs)
|
|
|
|
}
|
|
|
|
|
2016-03-18 11:48:31 -05:00
|
|
|
traits::VtableClosure(vtable_closure) =>
|
|
|
|
(vtable_closure.closure_def_id, vtable_closure.substs.func_substs),
|
|
|
|
|
2016-03-17 03:53:03 -05:00
|
|
|
traits::VtableFnPointer(_fn_ty) => {
|
|
|
|
let _trait_closure_kind = self.tcx.lang_items.fn_trait_kind(trait_id).unwrap();
|
2016-03-17 00:28:49 -05:00
|
|
|
unimplemented!()
|
|
|
|
// let llfn = trans_fn_pointer_shim(ccx, trait_closure_kind, fn_ty);
|
|
|
|
|
|
|
|
// let method_ty = def_ty(tcx, def_id, substs);
|
|
|
|
// let fn_ptr_ty = match method_ty.sty {
|
|
|
|
// ty::TyFnDef(_, _, fty) => tcx.mk_ty(ty::TyFnPtr(fty)),
|
|
|
|
// _ => unreachable!("expected fn item type, found {}",
|
|
|
|
// method_ty)
|
|
|
|
// };
|
|
|
|
// Callee::ptr(immediate_rvalue(llfn, fn_ptr_ty))
|
|
|
|
}
|
2016-03-18 11:48:31 -05:00
|
|
|
|
2016-03-17 03:53:03 -05:00
|
|
|
traits::VtableObject(ref _data) => {
|
2016-03-17 00:28:49 -05:00
|
|
|
unimplemented!()
|
|
|
|
// Callee {
|
|
|
|
// data: Virtual(traits::get_vtable_index_of_object_method(
|
|
|
|
// tcx, data, def_id)),
|
|
|
|
// ty: def_ty(tcx, def_id, substs)
|
|
|
|
// }
|
|
|
|
}
|
|
|
|
vtable => unreachable!("resolved vtable bad vtable {:?} in trans", vtable),
|
|
|
|
}
|
|
|
|
}
|
2016-03-14 22:48:00 -05:00
|
|
|
}
|
2016-03-14 22:18:39 -05:00
|
|
|
|
2016-04-28 23:01:17 -05:00
|
|
|
fn pointee_type(ptr_ty: ty::Ty) -> Option<ty::Ty> {
|
2016-03-20 23:59:13 -05:00
|
|
|
match ptr_ty.sty {
|
|
|
|
ty::TyRef(_, ty::TypeAndMut { ty, .. }) |
|
|
|
|
ty::TyRawPtr(ty::TypeAndMut { ty, .. }) |
|
|
|
|
ty::TyBox(ty) => {
|
|
|
|
Some(ty)
|
|
|
|
}
|
|
|
|
_ => None,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-21 19:51:08 -05:00
|
|
|
impl Lvalue {
|
|
|
|
fn to_ptr(self) -> Pointer {
|
|
|
|
assert_eq!(self.extra, LvalueExtra::None);
|
|
|
|
self.ptr
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
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
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-28 18:43:23 -05:00
|
|
|
#[derive(Debug)]
|
|
|
|
pub struct ImplMethod<'tcx> {
|
|
|
|
pub method: Rc<ty::Method<'tcx>>,
|
|
|
|
pub substs: &'tcx Substs<'tcx>,
|
|
|
|
pub is_provided: bool,
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Locates the applicable definition of a method, given its name.
|
|
|
|
pub fn get_impl_method<'tcx>(
|
|
|
|
tcx: &TyCtxt<'tcx>,
|
|
|
|
impl_def_id: DefId,
|
|
|
|
substs: &'tcx Substs<'tcx>,
|
|
|
|
name: ast::Name,
|
|
|
|
) -> ImplMethod<'tcx> {
|
|
|
|
assert!(!substs.types.needs_infer());
|
|
|
|
|
|
|
|
let trait_def_id = tcx.trait_id_of_impl(impl_def_id).unwrap();
|
|
|
|
let trait_def = tcx.lookup_trait_def(trait_def_id);
|
|
|
|
let infcx = infer::normalizing_infer_ctxt(tcx, &tcx.tables, ProjectionMode::Any);
|
|
|
|
|
|
|
|
match trait_def.ancestors(impl_def_id).fn_defs(tcx, name).next() {
|
|
|
|
Some(node_item) => {
|
|
|
|
ImplMethod {
|
|
|
|
method: node_item.item,
|
|
|
|
substs: traits::translate_substs(&infcx, impl_def_id, substs, node_item.node),
|
|
|
|
is_provided: node_item.node.is_from_trait(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
None => {
|
2016-04-06 20:00:34 -05:00
|
|
|
bug!("method {:?} not found in {:?}", name, impl_def_id);
|
2016-03-28 18:43:23 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-03-04 23:17:31 -06:00
|
|
|
pub fn interpret_start_points<'tcx>(tcx: &TyCtxt<'tcx>, mir_map: &MirMap<'tcx>) {
|
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
|
|
|
|
2016-05-09 19:21:21 -05:00
|
|
|
let mut gecx = GlobalEvalContext::new(tcx, mir_map);
|
|
|
|
let mut fecx = FnEvalContext::new(&mut gecx);
|
|
|
|
match fecx.call_nested(mir) {
|
|
|
|
Ok(Some(return_ptr)) => fecx.memory.dump(return_ptr.alloc_id),
|
|
|
|
Ok(None) => println!("(diverging function returned)"),
|
|
|
|
Err(_e) => {
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Detect whether the error was already reported or not.
|
2016-05-09 19:21:21 -05:00
|
|
|
// tcx.sess.err(&e.to_string());
|
2016-03-11 21:27:54 -06:00
|
|
|
}
|
2015-11-12 17:11:41 -06:00
|
|
|
}
|
2016-05-09 19:21:21 -05:00
|
|
|
|
2016-04-06 05:19:36 -05:00
|
|
|
println!("");
|
2015-11-12 17:11:41 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2016-04-23 01:03:59 -05:00
|
|
|
|
2016-05-09 21:08:37 -05:00
|
|
|
// TODO(solson): Upstream these methods into rustc::ty::layout.
|
2016-04-23 01:03:59 -05:00
|
|
|
|
|
|
|
trait IntegerExt {
|
|
|
|
fn size(self) -> Size;
|
|
|
|
}
|
|
|
|
|
|
|
|
impl IntegerExt for layout::Integer {
|
|
|
|
fn size(self) -> Size {
|
|
|
|
use rustc::ty::layout::Integer::*;
|
|
|
|
match self {
|
|
|
|
I1 | I8 => Size::from_bits(8),
|
|
|
|
I16 => Size::from_bits(16),
|
|
|
|
I32 => Size::from_bits(32),
|
|
|
|
I64 => Size::from_bits(64),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
trait StructExt {
|
|
|
|
fn field_offset(&self, index: usize) -> Size;
|
|
|
|
}
|
|
|
|
|
|
|
|
impl StructExt for layout::Struct {
|
|
|
|
fn field_offset(&self, index: usize) -> Size {
|
|
|
|
if index == 0 {
|
|
|
|
Size::from_bytes(0)
|
|
|
|
} else {
|
|
|
|
self.offset_after_field[index - 1]
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|