rust/src/lib.rs

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Rust
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#![feature(
rustc_private,
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catch_expr,
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inclusive_range_fields,
inclusive_range_methods,
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)]
#[macro_use]
extern crate log;
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// From rustc.
#[macro_use]
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extern crate rustc;
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extern crate rustc_data_structures;
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extern crate rustc_mir;
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extern crate rustc_target;
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extern crate syntax;
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extern crate regex;
#[macro_use]
extern crate lazy_static;
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use rustc::ty::{self, TyCtxt};
use rustc::ty::layout::{TyLayout, LayoutOf, Size};
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use rustc::ty::subst::Subst;
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use rustc::hir::def_id::DefId;
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use rustc::mir;
use syntax::ast::Mutability;
use syntax::codemap::Span;
use std::collections::{HashMap, BTreeMap};
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pub use rustc::mir::interpret::*;
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pub use rustc_mir::interpret::*;
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mod fn_call;
mod operator;
mod intrinsic;
mod helpers;
mod memory;
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mod tls;
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mod locks;
mod range_map;
mod validation;
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use fn_call::EvalContextExt as MissingFnsEvalContextExt;
use operator::EvalContextExt as OperatorEvalContextExt;
use intrinsic::EvalContextExt as IntrinsicEvalContextExt;
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use tls::EvalContextExt as TlsEvalContextExt;
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use locks::LockInfo;
use locks::MemoryExt as LockMemoryExt;
use validation::EvalContextExt as ValidationEvalContextExt;
use range_map::RangeMap;
use validation::{ValidationQuery, AbsPlace};
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pub trait ScalarExt {
fn null() -> Self;
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fn from_i32(i: i32) -> Self;
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fn from_u128(i: u128) -> Self;
fn from_i128(i: i128) -> Self;
fn from_usize(i: u64, ptr_size: Size) -> Self;
fn from_isize(i: i64, ptr_size: Size) -> Self;
fn from_f32(f: f32) -> Self;
fn from_f64(f: f64) -> Self;
fn to_usize<'a, 'mir, 'tcx>(self, ecx: &rustc_mir::interpret::EvalContext<'a, 'mir, 'tcx, Evaluator<'tcx>>) -> EvalResult<'static, u64>;
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fn is_null(self) -> EvalResult<'static, bool>;
/// HACK: this function just extracts all bits if `defined != 0`
/// Mainly used for args of C-functions and we should totally correctly fetch the size
/// of their arguments
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fn to_bytes(self) -> EvalResult<'static, u128>;
}
impl ScalarExt for Scalar {
fn null() -> Self {
Scalar::Bits { bits: 0, defined: 128 }
}
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fn from_i32(i: i32) -> Self {
Scalar::Bits { bits: i as u32 as u128, defined: 32 }
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}
fn from_u128(i: u128) -> Self {
Scalar::Bits { bits: i, defined: 128 }
}
fn from_i128(i: i128) -> Self {
Scalar::Bits { bits: i as u128, defined: 128 }
}
fn from_usize(i: u64, ptr_size: Size) -> Self {
Scalar::Bits { bits: i as u128, defined: ptr_size.bits() as u8 }
}
fn from_isize(i: i64, ptr_size: Size) -> Self {
Scalar::Bits { bits: i as i128 as u128, defined: ptr_size.bits() as u8 }
}
fn from_f32(f: f32) -> Self {
Scalar::Bits { bits: f.to_bits() as u128, defined: 32 }
}
fn from_f64(f: f64) -> Self {
Scalar::Bits { bits: f.to_bits() as u128, defined: 64 }
}
fn to_usize<'a, 'mir, 'tcx>(self, ecx: &rustc_mir::interpret::EvalContext<'a, 'mir, 'tcx, Evaluator<'tcx>>) -> EvalResult<'static, u64> {
let b = self.to_bits(ecx.memory.pointer_size())?;
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assert_eq!(b as u64 as u128, b);
Ok(b as u64)
}
fn is_null(self) -> EvalResult<'static, bool> {
match self {
Scalar::Bits { bits, defined } => {
if defined > 0 {
Ok(bits == 0)
} else {
err!(ReadUndefBytes)
}
}
Scalar::Ptr(_) => Ok(false)
}
}
fn to_bytes(self) -> EvalResult<'static, u128> {
match self {
Scalar::Bits { defined: 0, .. } => err!(ReadUndefBytes),
Scalar::Bits { bits, .. } => Ok(bits),
Scalar::Ptr(_) => err!(ReadPointerAsBytes),
}
}
}
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pub fn eval_main<'a, 'tcx: 'a>(
tcx: TyCtxt<'a, 'tcx, 'tcx>,
main_id: DefId,
start_wrapper: Option<DefId>,
) {
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fn run_main<'a, 'mir: 'a, 'tcx: 'mir>(
ecx: &mut rustc_mir::interpret::EvalContext<'a, 'mir, 'tcx, Evaluator<'tcx>>,
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main_id: DefId,
start_wrapper: Option<DefId>,
) -> EvalResult<'tcx> {
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let main_instance = ty::Instance::mono(ecx.tcx.tcx, main_id);
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let main_mir = ecx.load_mir(main_instance.def)?;
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let mut cleanup_ptr = None; // Scalar to be deallocated when we are done
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if !main_mir.return_ty().is_nil() || main_mir.arg_count != 0 {
return err!(Unimplemented(
"miri does not support main functions without `fn()` type signatures"
.to_owned(),
));
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}
if let Some(start_id) = start_wrapper {
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let main_ret_ty = ecx.tcx.fn_sig(main_id).output();
let main_ret_ty = main_ret_ty.no_late_bound_regions().unwrap();
let start_instance = ty::Instance::resolve(
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ecx.tcx.tcx,
ty::ParamEnv::reveal_all(),
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start_id,
ecx.tcx.mk_substs(
::std::iter::once(ty::subst::Kind::from(main_ret_ty)))).unwrap();
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let start_mir = ecx.load_mir(start_instance.def)?;
if start_mir.arg_count != 3 {
return err!(AbiViolation(format!(
"'start' lang item should have three arguments, but has {}",
start_mir.arg_count
)));
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}
// Return value
let size = ecx.tcx.data_layout.pointer_size;
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let align = ecx.tcx.data_layout.pointer_align;
let ret_ptr = ecx.memory_mut().allocate(size, align, Some(MemoryKind::Stack))?;
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cleanup_ptr = Some(ret_ptr);
// Push our stack frame
ecx.push_stack_frame(
start_instance,
start_mir.span,
start_mir,
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Place::from_ptr(ret_ptr, align),
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StackPopCleanup::None,
)?;
let mut args = ecx.frame().mir.args_iter();
// First argument: pointer to main()
let main_ptr = ecx.memory_mut().create_fn_alloc(main_instance);
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let dest = ecx.eval_place(&mir::Place::Local(args.next().unwrap()))?;
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let main_ty = main_instance.ty(ecx.tcx.tcx);
let main_ptr_ty = ecx.tcx.mk_fn_ptr(main_ty.fn_sig(ecx.tcx.tcx));
ecx.write_value(
ValTy {
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value: Value::Scalar(Scalar::Ptr(main_ptr)),
ty: main_ptr_ty,
},
dest,
)?;
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// Second argument (argc): 1
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let dest = ecx.eval_place(&mir::Place::Local(args.next().unwrap()))?;
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let ty = ecx.tcx.types.isize;
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ecx.write_scalar(dest, Scalar::from_u128(1), ty)?;
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// FIXME: extract main source file path
// Third argument (argv): &[b"foo"]
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let dest = ecx.eval_place(&mir::Place::Local(args.next().unwrap()))?;
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let ty = ecx.tcx.mk_imm_ptr(ecx.tcx.mk_imm_ptr(ecx.tcx.types.u8));
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let foo = ecx.memory.allocate_bytes(b"foo\0");
let ptr_size = ecx.memory.pointer_size();
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let ptr_align = ecx.tcx.data_layout.pointer_align;
let foo_ptr = ecx.memory.allocate(ptr_size, ptr_align, None)?;
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ecx.memory.write_scalar(foo_ptr.into(), ptr_align, Scalar::Ptr(foo), ptr_size, false)?;
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ecx.memory.mark_static_initialized(foo_ptr.alloc_id, Mutability::Immutable)?;
ecx.write_ptr(dest, foo_ptr.into(), ty)?;
assert!(args.next().is_none(), "start lang item has more arguments than expected");
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} else {
ecx.push_stack_frame(
main_instance,
main_mir.span,
main_mir,
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Place::from_scalar_ptr(Scalar::from_u128(1), ty::layout::Align::from_bytes(1, 1).unwrap()),
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StackPopCleanup::None,
)?;
// No arguments
let mut args = ecx.frame().mir.args_iter();
assert!(args.next().is_none(), "main function must not have arguments");
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}
while ecx.step()? {}
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ecx.run_tls_dtors()?;
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if let Some(cleanup_ptr) = cleanup_ptr {
ecx.memory_mut().deallocate(
cleanup_ptr,
None,
MemoryKind::Stack,
)?;
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}
Ok(())
}
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let mut ecx = EvalContext::new(tcx.at(syntax::codemap::DUMMY_SP), ty::ParamEnv::reveal_all(), Default::default(), Default::default());
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match run_main(&mut ecx, main_id, start_wrapper) {
Ok(()) => {
let leaks = ecx.memory().leak_report();
if leaks != 0 {
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//tcx.sess.err("the evaluated program leaked memory");
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}
}
Err(mut e) => {
ecx.tcx.sess.err(&e.to_string());
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ecx.report(&mut e, true, None);
for (i, frame) in ecx.stack().iter().enumerate() {
trace!("-------------------");
trace!("Frame {}", i);
trace!(" return: {:#?}", frame.return_place);
for (i, local) in frame.locals.iter().enumerate() {
if let Some(local) = local {
trace!(" local {}: {:?}", i, local);
}
}
}
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}
}
}
#[derive(Default)]
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pub struct Evaluator<'tcx> {
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/// Environment variables set by `setenv`
/// Miri does not expose env vars from the host to the emulated program
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pub(crate) env_vars: HashMap<Vec<u8>, Pointer>,
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/// Places that were suspended by the validation subsystem, and will be recovered later
pub(crate) suspended: HashMap<DynamicLifetime, Vec<ValidationQuery<'tcx>>>,
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}
pub type TlsKey = u128;
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#[derive(Copy, Clone, Debug)]
pub struct TlsEntry<'tcx> {
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data: Scalar, // Will eventually become a map from thread IDs to `Scalar`s, if we ever support more than one thread.
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dtor: Option<ty::Instance<'tcx>>,
}
#[derive(Default)]
pub struct MemoryData<'tcx> {
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/// The Key to use for the next thread-local allocation.
next_thread_local: TlsKey,
/// pthreads-style thread-local storage.
thread_local: BTreeMap<TlsKey, TlsEntry<'tcx>>,
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/// Memory regions that are locked by some function
///
/// Only mutable (static mut, heap, stack) allocations have an entry in this map.
/// The entry is created when allocating the memory and deleted after deallocation.
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locks: HashMap<AllocId, RangeMap<LockInfo<'tcx>>>,
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statics: HashMap<GlobalId<'tcx>, AllocId>,
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}
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impl<'mir, 'tcx: 'mir> Machine<'mir, 'tcx> for Evaluator<'tcx> {
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type MemoryData = MemoryData<'tcx>;
type MemoryKinds = memory::MemoryKind;
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/// Returns Ok() when the function was handled, fail otherwise
fn eval_fn_call<'a>(
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ecx: &mut EvalContext<'a, 'mir, 'tcx, Self>,
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instance: ty::Instance<'tcx>,
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destination: Option<(Place, mir::BasicBlock)>,
args: &[ValTy<'tcx>],
span: Span,
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sig: ty::FnSig<'tcx>,
) -> EvalResult<'tcx, bool> {
ecx.eval_fn_call(instance, destination, args, span, sig)
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}
fn call_intrinsic<'a>(
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ecx: &mut rustc_mir::interpret::EvalContext<'a, 'mir, 'tcx, Self>,
instance: ty::Instance<'tcx>,
args: &[ValTy<'tcx>],
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dest: Place,
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dest_layout: TyLayout<'tcx>,
target: mir::BasicBlock,
) -> EvalResult<'tcx> {
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ecx.call_intrinsic(instance, args, dest, dest_layout, target)
}
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fn try_ptr_op<'a>(
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ecx: &rustc_mir::interpret::EvalContext<'a, 'mir, 'tcx, Self>,
bin_op: mir::BinOp,
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left: Scalar,
left_ty: ty::Ty<'tcx>,
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right: Scalar,
right_ty: ty::Ty<'tcx>,
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) -> EvalResult<'tcx, Option<(Scalar, bool)>> {
ecx.ptr_op(bin_op, left, left_ty, right, right_ty)
}
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fn mark_static_initialized<'a>(
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mem: &mut Memory<'a, 'mir, 'tcx, Self>,
id: AllocId,
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_mutability: Mutability,
) -> EvalResult<'tcx, bool> {
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use memory::MemoryKind::*;
match mem.get_alloc_kind(id) {
// FIXME: This could be allowed, but not for env vars set during miri execution
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Some(MemoryKind::Machine(Env)) => err!(Unimplemented("statics can't refer to env vars".to_owned())),
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_ => Ok(false), // TODO: What does the bool mean?
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}
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}
fn init_static<'a>(
ecx: &mut EvalContext<'a, 'mir, 'tcx, Self>,
cid: GlobalId<'tcx>,
) -> EvalResult<'tcx, AllocId> {
// Step 1: If the static has already been evaluated return the cached version
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if let Some(alloc_id) = ecx.memory.data.statics.get(&cid) {
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return Ok(*alloc_id);
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}
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let tcx = ecx.tcx.tcx;
// Step 2: Load mir
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let mut mir = ecx.load_mir(cid.instance.def)?;
if let Some(index) = cid.promoted {
mir = &mir.promoted[index];
}
assert!(mir.arg_count == 0);
// Step 3: Allocate storage
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let layout = ecx.layout_of(mir.return_ty().subst(tcx, cid.instance.substs))?;
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assert!(!layout.is_unsized());
let ptr = ecx.memory.allocate(
layout.size,
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layout.align,
None,
)?;
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// Step 4: Cache allocation id for recursive statics
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assert!(ecx.memory.data.statics.insert(cid, ptr.alloc_id).is_none());
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// Step 5: Push stackframe to evaluate static
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let cleanup = StackPopCleanup::None;
ecx.push_stack_frame(
cid.instance,
mir.span,
mir,
Place::from_ptr(ptr, layout.align),
cleanup,
)?;
// Step 6: Step until static has been initialized
let call_stackframe = ecx.stack().len();
while ecx.step()? && ecx.stack().len() >= call_stackframe {
if ecx.stack().len() == call_stackframe {
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let frame = ecx.frame_mut();
let bb = &frame.mir.basic_blocks()[frame.block];
if bb.statements.len() == frame.stmt && !bb.is_cleanup {
match bb.terminator().kind {
::rustc::mir::TerminatorKind::Return => {
for (local, _local_decl) in mir.local_decls.iter_enumerated().skip(1) {
// Don't deallocate locals, because the return value might reference them
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frame.storage_dead(local);
}
}
_ => {}
}
}
}
}
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// TODO: Freeze immutable statics without copying them to the global static cache
// Step 7: Return the alloc
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Ok(ptr.alloc_id)
}
fn box_alloc<'a>(
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ecx: &mut EvalContext<'a, 'mir, 'tcx, Self>,
ty: ty::Ty<'tcx>,
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dest: Place,
) -> EvalResult<'tcx> {
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let layout = ecx.layout_of(ty)?;
// Call the `exchange_malloc` lang item
let malloc = ecx.tcx.lang_items().exchange_malloc_fn().unwrap();
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let malloc = ty::Instance::mono(ecx.tcx.tcx, malloc);
let malloc_mir = ecx.load_mir(malloc.def)?;
ecx.push_stack_frame(
malloc,
malloc_mir.span,
malloc_mir,
dest,
// Don't do anything when we are done. The statement() function will increment
// the old stack frame's stmt counter to the next statement, which means that when
// exchange_malloc returns, we go on evaluating exactly where we want to be.
StackPopCleanup::None,
)?;
let mut args = ecx.frame().mir.args_iter();
let usize = ecx.tcx.types.usize;
// First argument: size
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let dest = ecx.eval_place(&mir::Place::Local(args.next().unwrap()))?;
ecx.write_value(
ValTy {
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value: Value::Scalar(Scalar::from_u128(match layout.size.bytes() {
0 => 1 as u128,
size => size as u128,
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}.into())),
ty: usize,
},
dest,
)?;
// Second argument: align
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let dest = ecx.eval_place(&mir::Place::Local(args.next().unwrap()))?;
ecx.write_value(
ValTy {
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value: Value::Scalar(Scalar::from_u128(layout.align.abi().into())),
ty: usize,
},
dest,
)?;
// No more arguments
assert!(args.next().is_none(), "exchange_malloc lang item has more arguments than expected");
Ok(())
}
fn global_item_with_linkage<'a>(
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_ecx: &mut EvalContext<'a, 'mir, 'tcx, Self>,
_instance: ty::Instance<'tcx>,
_mutability: Mutability,
) -> EvalResult<'tcx> {
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panic!("remove this function from rustc");
}
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fn check_locks<'a>(
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mem: &Memory<'a, 'mir, 'tcx, Self>,
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ptr: Pointer,
size: Size,
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access: AccessKind,
) -> EvalResult<'tcx> {
mem.check_locks(ptr, size.bytes(), access)
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}
fn add_lock<'a>(
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mem: &mut Memory<'a, 'mir, 'tcx, Self>,
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id: AllocId,
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) {
mem.data.locks.insert(id, RangeMap::new());
}
fn free_lock<'a>(
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mem: &mut Memory<'a, 'mir, 'tcx, Self>,
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id: AllocId,
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len: u64,
) -> EvalResult<'tcx> {
mem.data.locks
.remove(&id)
.expect("allocation has no corresponding locks")
.check(
Some(mem.cur_frame),
0,
len,
AccessKind::Read,
)
.map_err(|lock| {
EvalErrorKind::DeallocatedLockedMemory {
//ptr, FIXME
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ptr: Pointer {
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alloc_id: AllocId(0),
offset: Size::from_bytes(0),
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},
lock: lock.active,
}.into()
})
}
fn end_region<'a>(
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ecx: &mut EvalContext<'a, 'mir, 'tcx, Self>,
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reg: Option<::rustc::middle::region::Scope>,
) -> EvalResult<'tcx> {
ecx.end_region(reg)
}
fn validation_op<'a>(
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_ecx: &mut EvalContext<'a, 'mir, 'tcx, Self>,
_op: ::rustc::mir::ValidationOp,
_operand: &::rustc::mir::ValidationOperand<'tcx, ::rustc::mir::Place<'tcx>>,
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) -> EvalResult<'tcx> {
// FIXME: prevent this from ICEing
//ecx.validation_op(op, operand)
Ok(())
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}
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}