9 extern crate log_settings;
12 extern crate rustc_const_math;
13 extern crate rustc_data_structures;
16 use rustc::ty::{self, TyCtxt};
17 use rustc::ty::layout::Layout;
18 use rustc::hir::def_id::DefId;
21 use syntax::codemap::Span;
23 use std::collections::{
28 extern crate rustc_miri;
29 pub use rustc_miri::interpret::*;
38 use fn_call::EvalContextExt as MissingFnsEvalContextExt;
39 use operator::EvalContextExt as OperatorEvalContextExt;
40 use intrinsic::EvalContextExt as IntrinsicEvalContextExt;
41 use tls::MemoryExt as TlsMemoryExt;
43 pub fn eval_main<'a, 'tcx: 'a>(
44 tcx: TyCtxt<'a, 'tcx, 'tcx>,
46 start_wrapper: Option<DefId>,
47 limits: ResourceLimits,
49 fn run_main<'a, 'tcx: 'a>(
50 ecx: &mut rustc_miri::interpret::EvalContext<'a, 'tcx, Evaluator>,
52 start_wrapper: Option<DefId>,
53 ) -> EvalResult<'tcx> {
54 let main_instance = ty::Instance::mono(ecx.tcx, main_id);
55 let main_mir = ecx.load_mir(main_instance.def)?;
56 let mut cleanup_ptr = None; // Pointer to be deallocated when we are done
58 if !main_mir.return_ty.is_nil() || main_mir.arg_count != 0 {
59 return Err(EvalError::Unimplemented("miri does not support main functions without `fn()` type signatures".to_owned()));
62 if let Some(start_id) = start_wrapper {
63 let start_instance = ty::Instance::mono(ecx.tcx, start_id);
64 let start_mir = ecx.load_mir(start_instance.def)?;
66 if start_mir.arg_count != 3 {
67 return Err(EvalError::AbiViolation(format!("'start' lang item should have three arguments, but has {}", start_mir.arg_count)));
71 let size = ecx.tcx.data_layout.pointer_size.bytes();
72 let align = ecx.tcx.data_layout.pointer_align.abi();
73 let ret_ptr = ecx.memory_mut().allocate(size, align, Kind::Stack)?;
74 cleanup_ptr = Some(ret_ptr);
76 // Push our stack frame
81 Lvalue::from_ptr(ret_ptr),
82 StackPopCleanup::None,
85 let mut args = ecx.frame().mir.args_iter();
87 // First argument: pointer to main()
88 let main_ptr = ecx.memory_mut().create_fn_alloc(main_instance);
89 let dest = ecx.eval_lvalue(&mir::Lvalue::Local(args.next().unwrap()))?;
90 let main_ty = main_instance.def.def_ty(ecx.tcx);
91 let main_ptr_ty = ecx.tcx.mk_fn_ptr(main_ty.fn_sig(ecx.tcx));
92 ecx.write_value(Value::ByVal(PrimVal::Ptr(main_ptr)), dest, main_ptr_ty)?;
94 // Second argument (argc): 0
95 let dest = ecx.eval_lvalue(&mir::Lvalue::Local(args.next().unwrap()))?;
96 let ty = ecx.tcx.types.isize;
97 ecx.write_null(dest, ty)?;
99 // Third argument (argv): 0
100 let dest = ecx.eval_lvalue(&mir::Lvalue::Local(args.next().unwrap()))?;
101 let ty = ecx.tcx.mk_imm_ptr(ecx.tcx.mk_imm_ptr(ecx.tcx.types.u8));
102 ecx.write_null(dest, ty)?;
104 ecx.push_stack_frame(
109 StackPopCleanup::None,
115 if let Some(cleanup_ptr) = cleanup_ptr {
116 ecx.memory_mut().deallocate(cleanup_ptr, None, Kind::Stack)?;
121 let mut ecx = EvalContext::new(tcx, limits, Default::default(), Default::default());
122 match run_main(&mut ecx, main_id, start_wrapper) {
124 let leaks = ecx.memory().leak_report();
126 tcx.sess.err("the evaluated program leaked memory");
137 struct EvaluatorData {
138 /// Environment variables set by `setenv`
139 /// Miri does not expose env vars from the host to the emulated program
140 pub(crate) env_vars: HashMap<Vec<u8>, MemoryPointer>,
143 pub type TlsKey = usize;
145 #[derive(Copy, Clone, Debug)]
146 pub struct TlsEntry<'tcx> {
147 data: Pointer, // Will eventually become a map from thread IDs to `Pointer`s, if we ever support more than one thread.
148 dtor: Option<ty::Instance<'tcx>>,
152 struct MemoryData<'tcx> {
153 /// The Key to use for the next thread-local allocation.
154 next_thread_local: TlsKey,
156 /// pthreads-style thread-local storage.
157 thread_local: BTreeMap<TlsKey, TlsEntry<'tcx>>,
160 trait EvalContextExt<'tcx> {
161 fn finish(&mut self) -> EvalResult<'tcx>;
164 impl<'a, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'tcx, Evaluator> {
165 fn finish(&mut self) -> EvalResult<'tcx> {
166 let mut dtor = self.memory.fetch_tls_dtor(None)?;
167 // FIXME: replace loop by some structure that works with stepping
168 while let Some((instance, ptr, key)) = dtor {
169 trace!("Running TLS dtor {:?} on {:?}", instance, ptr);
170 // TODO: Potentially, this has to support all the other possible instances?
171 // See eval_fn_call in interpret/terminator/mod.rs
172 let mir = self.load_mir(instance.def)?;
173 self.push_stack_frame(
178 StackPopCleanup::None,
180 let arg_local = self.frame().mir.args_iter().next().ok_or(EvalError::AbiViolation("TLS dtor does not take enough arguments.".to_owned()))?;
181 let dest = self.eval_lvalue(&mir::Lvalue::Local(arg_local))?;
182 let ty = self.tcx.mk_mut_ptr(self.tcx.types.u8);
183 self.write_ptr(dest, ptr, ty)?;
185 // step until out of stackframes
186 while self.step()? {}
188 dtor = match self.memory.fetch_tls_dtor(Some(key))? {
189 dtor @ Some(_) => dtor,
190 None => self.memory.fetch_tls_dtor(None)?,
197 impl<'tcx> Machine<'tcx> for Evaluator {
198 type Data = EvaluatorData;
199 type MemoryData = MemoryData<'tcx>;
200 type MemoryKinds = memory::Kind;
202 /// Returns Ok() when the function was handled, fail otherwise
204 ecx: &mut EvalContext<'a, 'tcx, Self>,
205 instance: ty::Instance<'tcx>,
206 destination: Option<(Lvalue<'tcx>, mir::BasicBlock)>,
207 arg_operands: &[mir::Operand<'tcx>],
209 sig: ty::FnSig<'tcx>,
210 ) -> EvalResult<'tcx, bool> {
211 ecx.eval_fn_call(instance, destination, arg_operands, span, sig)
214 fn call_intrinsic<'a>(
215 ecx: &mut rustc_miri::interpret::EvalContext<'a, 'tcx, Self>,
216 instance: ty::Instance<'tcx>,
217 args: &[mir::Operand<'tcx>],
219 dest_ty: ty::Ty<'tcx>,
220 dest_layout: &'tcx Layout,
221 target: mir::BasicBlock,
222 ) -> EvalResult<'tcx> {
223 ecx.call_intrinsic(instance, args, dest, dest_ty, dest_layout, target)
227 ecx: &rustc_miri::interpret::EvalContext<'a, 'tcx, Self>,
230 left_ty: ty::Ty<'tcx>,
232 right_ty: ty::Ty<'tcx>,
233 ) -> EvalResult<'tcx, Option<(PrimVal, bool)>> {
234 ecx.ptr_op(bin_op, left, left_ty, right, right_ty)
237 fn mark_static_initialized(m: memory::Kind) -> EvalResult<'tcx> {
240 // FIXME: This could be allowed, but not for env vars set during miri execution
241 Env => Err(EvalError::Unimplemented("statics can't refer to env vars".to_owned())),
247 ecx: &mut EvalContext<'a, 'tcx, Self>,
249 ) -> EvalResult<'tcx, PrimVal> {
250 // FIXME: call the `exchange_malloc` lang item if available
251 let size = ecx.type_size(ty)?.expect("box only works with sized types");
252 let align = ecx.type_align(ty)?;
254 Ok(PrimVal::Bytes(align.into()))
257 .allocate(size, align, Kind::Machine(memory::Kind::Rust))