181851fc6b
statics are rare and constants are copied anyway. Reading from a constant should then yield a `ByVal` again if possible.
574 lines
25 KiB
Rust
574 lines
25 KiB
Rust
use rustc::ty::{self, Ty};
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use rustc::hir::def_id::{DefId, CRATE_DEF_INDEX};
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use rustc::mir;
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use syntax::attr;
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use syntax::abi::Abi;
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use syntax::codemap::Span;
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use std::mem;
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use rustc_miri::interpret::*;
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use super::{
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TlsKey,
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EvalContext,
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};
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use tls::MemoryExt;
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use super::memory::Kind;
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pub trait EvalContextExt<'tcx> {
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fn call_c_abi(
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&mut self,
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def_id: DefId,
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arg_operands: &[mir::Operand<'tcx>],
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dest: Lvalue,
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dest_ty: Ty<'tcx>,
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dest_block: mir::BasicBlock,
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) -> EvalResult<'tcx>;
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fn resolve_path(&self, path: &[&str]) -> EvalResult<'tcx, ty::Instance<'tcx>>;
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fn call_missing_fn(
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&mut self,
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instance: ty::Instance<'tcx>,
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destination: Option<(Lvalue, mir::BasicBlock)>,
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arg_operands: &[mir::Operand<'tcx>],
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sig: ty::FnSig<'tcx>,
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path: String,
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) -> EvalResult<'tcx>;
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fn eval_fn_call(
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&mut self,
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instance: ty::Instance<'tcx>,
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destination: Option<(Lvalue, mir::BasicBlock)>,
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arg_operands: &[mir::Operand<'tcx>],
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span: Span,
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sig: ty::FnSig<'tcx>,
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) -> EvalResult<'tcx, bool>;
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}
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impl<'a, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'tcx, super::Evaluator> {
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fn eval_fn_call(
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&mut self,
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instance: ty::Instance<'tcx>,
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destination: Option<(Lvalue, mir::BasicBlock)>,
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arg_operands: &[mir::Operand<'tcx>],
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span: Span,
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sig: ty::FnSig<'tcx>,
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) -> EvalResult<'tcx, bool> {
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trace!("eval_fn_call: {:#?}, {:#?}", instance, destination);
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let mir = match self.load_mir(instance.def) {
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Ok(mir) => mir,
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Err(EvalError{ kind: EvalErrorKind::NoMirFor(path), ..} ) => {
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self.call_missing_fn(instance, destination, arg_operands, sig, path)?;
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return Ok(true);
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},
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Err(other) => return Err(other),
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};
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let (return_lvalue, return_to_block) = match destination {
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Some((lvalue, block)) => (lvalue, StackPopCleanup::Goto(block)),
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None => (Lvalue::undef(), StackPopCleanup::None),
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};
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self.push_stack_frame(
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instance,
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span,
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mir,
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return_lvalue,
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return_to_block,
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)?;
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Ok(false)
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}
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fn call_c_abi(
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&mut self,
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def_id: DefId,
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arg_operands: &[mir::Operand<'tcx>],
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dest: Lvalue,
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dest_ty: Ty<'tcx>,
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dest_block: mir::BasicBlock,
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) -> EvalResult<'tcx> {
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let name = self.tcx.item_name(def_id);
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let attrs = self.tcx.get_attrs(def_id);
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let link_name = attr::first_attr_value_str_by_name(&attrs, "link_name")
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.unwrap_or(name)
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.as_str();
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let args_res: EvalResult<Vec<Value>> = arg_operands.iter()
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.map(|arg| self.eval_operand(arg))
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.collect();
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let args = args_res?;
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let usize = self.tcx.types.usize;
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match &link_name[..] {
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"malloc" => {
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let size = self.value_to_primval(args[0], usize)?.to_u64()?;
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if size == 0 {
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self.write_null(dest, dest_ty)?;
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} else {
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let align = self.memory.pointer_size();
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let ptr = self.memory.allocate(size, align, Kind::C.into())?;
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self.write_primval(dest, PrimVal::Ptr(ptr), dest_ty)?;
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}
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}
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"free" => {
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let ptr = args[0].into_ptr(&mut self.memory)?;
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if !ptr.is_null()? {
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self.memory.deallocate(ptr.to_ptr()?, None, Kind::C.into())?;
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}
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}
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"syscall" => {
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// TODO: read `syscall` ids like `sysconf` ids and
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// figure out some way to actually process some of them
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//
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// libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)
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// is called if a `HashMap` is created the regular way.
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match self.value_to_primval(args[0], usize)?.to_u64()? {
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318 |
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511 => return err!(Unimplemented("miri does not support random number generators".to_owned())),
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id => return err!(Unimplemented(format!("miri does not support syscall id {}", id))),
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}
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}
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"dlsym" => {
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let _handle = args[0].into_ptr(&mut self.memory)?;
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let symbol = args[1].into_ptr(&mut self.memory)?.to_ptr()?;
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let symbol_name = self.memory.read_c_str(symbol)?;
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let err = format!("bad c unicode symbol: {:?}", symbol_name);
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let symbol_name = ::std::str::from_utf8(symbol_name).unwrap_or(&err);
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return err!(Unimplemented(format!("miri does not support dynamically loading libraries (requested symbol: {})", symbol_name)));
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}
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"__rust_maybe_catch_panic" => {
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// fn __rust_maybe_catch_panic(f: fn(*mut u8), data: *mut u8, data_ptr: *mut usize, vtable_ptr: *mut usize) -> u32
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// We abort on panic, so not much is going on here, but we still have to call the closure
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let u8_ptr_ty = self.tcx.mk_mut_ptr(self.tcx.types.u8);
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let f = args[0].into_ptr(&mut self.memory)?.to_ptr()?;
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let data = args[1].into_ptr(&mut self.memory)?;
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let f_instance = self.memory.get_fn(f)?;
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self.write_null(dest, dest_ty)?;
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// Now we make a function call. TODO: Consider making this re-usable? EvalContext::step does sth. similar for the TLS dtors,
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// and of course eval_main.
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let mir = self.load_mir(f_instance.def)?;
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self.push_stack_frame(
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f_instance,
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mir.span,
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mir,
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Lvalue::undef(),
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StackPopCleanup::Goto(dest_block),
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)?;
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let arg_local = self.frame().mir.args_iter().next().ok_or(EvalErrorKind::AbiViolation("Argument to __rust_maybe_catch_panic does not take enough arguments.".to_owned()))?;
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let arg_dest = self.eval_lvalue(&mir::Lvalue::Local(arg_local))?;
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self.write_ptr(arg_dest, data, u8_ptr_ty)?;
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// We ourselves return 0
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self.write_null(dest, dest_ty)?;
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// Don't fall through
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return Ok(());
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}
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"__rust_start_panic" => {
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return err!(Panic);
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}
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"memcmp" => {
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let left = args[0].into_ptr(&mut self.memory)?;
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let right = args[1].into_ptr(&mut self.memory)?;
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let n = self.value_to_primval(args[2], usize)?.to_u64()?;
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let result = {
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let left_bytes = self.memory.read_bytes(left, n)?;
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let right_bytes = self.memory.read_bytes(right, n)?;
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use std::cmp::Ordering::*;
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match left_bytes.cmp(right_bytes) {
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Less => -1i8,
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Equal => 0,
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Greater => 1,
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}
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};
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self.write_primval(dest, PrimVal::Bytes(result as u128), dest_ty)?;
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}
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"memrchr" => {
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let ptr = args[0].into_ptr(&mut self.memory)?;
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let val = self.value_to_primval(args[1], usize)?.to_u64()? as u8;
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let num = self.value_to_primval(args[2], usize)?.to_u64()?;
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if let Some(idx) = self.memory.read_bytes(ptr, num)?.iter().rev().position(|&c| c == val) {
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let new_ptr = ptr.offset(num - idx as u64 - 1, &self)?;
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self.write_ptr(dest, new_ptr, dest_ty)?;
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} else {
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self.write_null(dest, dest_ty)?;
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}
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}
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"memchr" => {
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let ptr = args[0].into_ptr(&mut self.memory)?;
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let val = self.value_to_primval(args[1], usize)?.to_u64()? as u8;
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let num = self.value_to_primval(args[2], usize)?.to_u64()?;
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if let Some(idx) = self.memory.read_bytes(ptr, num)?.iter().position(|&c| c == val) {
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let new_ptr = ptr.offset(idx as u64, &self)?;
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self.write_ptr(dest, new_ptr, dest_ty)?;
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} else {
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self.write_null(dest, dest_ty)?;
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}
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}
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"getenv" => {
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let result = {
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let name_ptr = args[0].into_ptr(&mut self.memory)?.to_ptr()?;
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let name = self.memory.read_c_str(name_ptr)?;
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match self.machine_data.env_vars.get(name) {
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Some(&var) => PrimVal::Ptr(var),
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None => PrimVal::Bytes(0),
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}
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};
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self.write_primval(dest, result, dest_ty)?;
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}
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"unsetenv" => {
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let mut success = None;
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{
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let name_ptr = args[0].into_ptr(&mut self.memory)?;
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if !name_ptr.is_null()? {
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let name = self.memory.read_c_str(name_ptr.to_ptr()?)?;
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if !name.is_empty() && !name.contains(&b'=') {
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success = Some(self.machine_data.env_vars.remove(name));
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}
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}
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}
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if let Some(old) = success {
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if let Some(var) = old {
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self.memory.deallocate(var, None, Kind::Env.into())?;
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}
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self.write_null(dest, dest_ty)?;
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} else {
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self.write_primval(dest, PrimVal::from_i128(-1), dest_ty)?;
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}
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}
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"setenv" => {
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let mut new = None;
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{
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let name_ptr = args[0].into_ptr(&mut self.memory)?;
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let value_ptr = args[1].into_ptr(&mut self.memory)?.to_ptr()?;
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let value = self.memory.read_c_str(value_ptr)?;
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if !name_ptr.is_null()? {
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let name = self.memory.read_c_str(name_ptr.to_ptr()?)?;
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if !name.is_empty() && !name.contains(&b'=') {
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new = Some((name.to_owned(), value.to_owned()));
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}
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}
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}
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if let Some((name, value)) = new {
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// +1 for the null terminator
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let value_copy = self.memory.allocate((value.len() + 1) as u64, 1, Kind::Env.into())?;
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self.memory.write_bytes(value_copy.into(), &value)?;
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let trailing_zero_ptr = value_copy.offset(value.len() as u64, &self)?.into();
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self.memory.write_bytes(trailing_zero_ptr, &[0])?;
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if let Some(var) = self.machine_data.env_vars.insert(name.to_owned(), value_copy) {
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self.memory.deallocate(var, None, Kind::Env.into())?;
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}
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self.write_null(dest, dest_ty)?;
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} else {
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self.write_primval(dest, PrimVal::from_i128(-1), dest_ty)?;
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}
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}
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"write" => {
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let fd = self.value_to_primval(args[0], usize)?.to_u64()?;
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let buf = args[1].into_ptr(&mut self.memory)?;
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let n = self.value_to_primval(args[2], usize)?.to_u64()?;
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trace!("Called write({:?}, {:?}, {:?})", fd, buf, n);
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let result = if fd == 1 || fd == 2 { // stdout/stderr
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use std::io::{self, Write};
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let buf_cont = self.memory.read_bytes(buf, n)?;
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let res = if fd == 1 { io::stdout().write(buf_cont) } else { io::stderr().write(buf_cont) };
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match res { Ok(n) => n as isize, Err(_) => -1 }
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} else {
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info!("Ignored output to FD {}", fd);
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n as isize // pretend it all went well
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}; // now result is the value we return back to the program
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self.write_primval(dest, PrimVal::Bytes(result as u128), dest_ty)?;
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}
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"strlen" => {
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let ptr = args[0].into_ptr(&mut self.memory)?.to_ptr()?;
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let n = self.memory.read_c_str(ptr)?.len();
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self.write_primval(dest, PrimVal::Bytes(n as u128), dest_ty)?;
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}
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// Some things needed for sys::thread initialization to go through
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"signal" | "sigaction" | "sigaltstack" => {
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self.write_primval(dest, PrimVal::Bytes(0), dest_ty)?;
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}
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"sysconf" => {
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let name = self.value_to_primval(args[0], usize)?.to_u64()?;
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trace!("sysconf() called with name {}", name);
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// cache the sysconf integers via miri's global cache
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let paths = &[
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(&["libc", "_SC_PAGESIZE"], PrimVal::Bytes(4096)),
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(&["libc", "_SC_GETPW_R_SIZE_MAX"], PrimVal::from_i128(-1)),
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];
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let mut result = None;
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for &(path, path_value) in paths {
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if let Ok(instance) = self.resolve_path(path) {
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let cid = GlobalId { instance, promoted: None };
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// compute global if not cached
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let val = match self.globals.get(&cid).map(|&ptr| ptr) {
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Some(ptr) => self.value_to_primval(Value::by_ref(ptr.into()), usize)?.to_u64()?,
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None => eval_body_as_primval(self.tcx, instance)?.0.to_u64()?,
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};
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if val == name {
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result = Some(path_value);
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break;
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}
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}
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}
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if let Some(result) = result {
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self.write_primval(dest, result, dest_ty)?;
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} else {
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return err!(Unimplemented(format!("Unimplemented sysconf name: {}", name)));
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}
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}
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// Hook pthread calls that go to the thread-local storage memory subsystem
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"pthread_key_create" => {
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let key_ptr = args[0].into_ptr(&mut self.memory)?;
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// Extract the function type out of the signature (that seems easier than constructing it ourselves...)
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let dtor = match args[1].into_ptr(&mut self.memory)?.into_inner_primval() {
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PrimVal::Ptr(dtor_ptr) => Some(self.memory.get_fn(dtor_ptr)?),
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PrimVal::Bytes(0) => None,
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PrimVal::Bytes(_) => return err!(ReadBytesAsPointer),
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PrimVal::Undef => return err!(ReadUndefBytes),
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};
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// Figure out how large a pthread TLS key actually is. This is libc::pthread_key_t.
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let key_type = self.operand_ty(&arg_operands[0]).builtin_deref(true, ty::LvaluePreference::NoPreference)
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.ok_or(EvalErrorKind::AbiViolation("Wrong signature used for pthread_key_create: First argument must be a raw pointer.".to_owned()))?.ty;
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let key_size = {
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let layout = self.type_layout(key_type)?;
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layout.size(&self.tcx.data_layout)
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};
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// Create key and write it into the memory where key_ptr wants it
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let key = self.memory.create_tls_key(dtor) as u128;
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if key_size.bits() < 128 && key >= (1u128 << key_size.bits() as u128) {
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return err!(OutOfTls);
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}
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// TODO: Does this need checking for alignment?
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self.memory.write_uint(key_ptr.to_ptr()?, key, key_size.bytes())?;
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// Return success (0)
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self.write_null(dest, dest_ty)?;
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}
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"pthread_key_delete" => {
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// The conversion into TlsKey here is a little fishy, but should work as long as usize >= libc::pthread_key_t
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let key = self.value_to_primval(args[0], usize)?.to_u64()? as TlsKey;
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self.memory.delete_tls_key(key)?;
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// Return success (0)
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self.write_null(dest, dest_ty)?;
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}
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"pthread_getspecific" => {
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// The conversion into TlsKey here is a little fishy, but should work as long as usize >= libc::pthread_key_t
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let key = self.value_to_primval(args[0], usize)?.to_u64()? as TlsKey;
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let ptr = self.memory.load_tls(key)?;
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self.write_ptr(dest, ptr, dest_ty)?;
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}
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"pthread_setspecific" => {
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// The conversion into TlsKey here is a little fishy, but should work as long as usize >= libc::pthread_key_t
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let key = self.value_to_primval(args[0], usize)?.to_u64()? as TlsKey;
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let new_ptr = args[1].into_ptr(&mut self.memory)?;
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self.memory.store_tls(key, new_ptr)?;
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// Return success (0)
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self.write_null(dest, dest_ty)?;
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}
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// Stub out all the other pthread calls to just return 0
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link_name if link_name.starts_with("pthread_") => {
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warn!("ignoring C ABI call: {}", link_name);
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self.write_null(dest, dest_ty)?;
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},
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_ => {
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return err!(Unimplemented(format!("can't call C ABI function: {}", link_name)));
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}
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}
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// Since we pushed no stack frame, the main loop will act
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// as if the call just completed and it's returning to the
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// current frame.
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self.dump_local(dest);
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self.goto_block(dest_block);
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Ok(())
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}
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/// Get an instance for a path.
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fn resolve_path(&self, path: &[&str]) -> EvalResult<'tcx, ty::Instance<'tcx>> {
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let cstore = &self.tcx.sess.cstore;
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let crates = cstore.crates();
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crates.iter()
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.find(|&&krate| cstore.crate_name(krate) == path[0])
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.and_then(|krate| {
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let krate = DefId {
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krate: *krate,
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index: CRATE_DEF_INDEX,
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};
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let mut items = cstore.item_children(krate, self.tcx.sess);
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let mut path_it = path.iter().skip(1).peekable();
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while let Some(segment) = path_it.next() {
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for item in &mem::replace(&mut items, vec![]) {
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if item.ident.name == *segment {
|
|
if path_it.peek().is_none() {
|
|
return Some(ty::Instance::mono(self.tcx, item.def.def_id()));
|
|
}
|
|
|
|
items = cstore.item_children(item.def.def_id(), self.tcx.sess);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
None
|
|
})
|
|
.ok_or_else(|| {
|
|
let path = path.iter()
|
|
.map(|&s| s.to_owned())
|
|
.collect();
|
|
EvalErrorKind::PathNotFound(path).into()
|
|
})
|
|
}
|
|
|
|
fn call_missing_fn(
|
|
&mut self,
|
|
instance: ty::Instance<'tcx>,
|
|
destination: Option<(Lvalue, mir::BasicBlock)>,
|
|
arg_operands: &[mir::Operand<'tcx>],
|
|
sig: ty::FnSig<'tcx>,
|
|
path: String,
|
|
) -> EvalResult<'tcx> {
|
|
// In some cases in non-MIR libstd-mode, not having a destination is legit. Handle these early.
|
|
match &path[..] {
|
|
"std::panicking::rust_panic_with_hook" |
|
|
"std::rt::begin_panic_fmt" => return err!(Panic),
|
|
_ => {},
|
|
}
|
|
|
|
let dest_ty = sig.output();
|
|
let (dest, dest_block) = destination.ok_or_else(|| EvalErrorKind::NoMirFor(path.clone()))?;
|
|
|
|
if sig.abi == Abi::C {
|
|
// An external C function
|
|
// TODO: That functions actually has a similar preamble to what follows here. May make sense to
|
|
// unify these two mechanisms for "hooking into missing functions".
|
|
self.call_c_abi(instance.def_id(), arg_operands, dest, dest_ty, dest_block)?;
|
|
return Ok(());
|
|
}
|
|
|
|
let args_res: EvalResult<Vec<Value>> = arg_operands.iter()
|
|
.map(|arg| self.eval_operand(arg))
|
|
.collect();
|
|
let args = args_res?;
|
|
|
|
let usize = self.tcx.types.usize;
|
|
|
|
match &path[..] {
|
|
// Allocators are magic. They have no MIR, even when the rest of libstd does.
|
|
"alloc::heap::::__rust_alloc" => {
|
|
let size = self.value_to_primval(args[0], usize)?.to_u64()?;
|
|
let align = self.value_to_primval(args[1], usize)?.to_u64()?;
|
|
if size == 0 {
|
|
return err!(HeapAllocZeroBytes);
|
|
}
|
|
if !align.is_power_of_two() {
|
|
return err!(HeapAllocNonPowerOfTwoAlignment(align));
|
|
}
|
|
let ptr = self.memory.allocate(size, align, Kind::Rust.into())?;
|
|
self.write_primval(dest, PrimVal::Ptr(ptr), dest_ty)?;
|
|
}
|
|
"alloc::heap::::__rust_alloc_zeroed" => {
|
|
let size = self.value_to_primval(args[0], usize)?.to_u64()?;
|
|
let align = self.value_to_primval(args[1], usize)?.to_u64()?;
|
|
if size == 0 {
|
|
return err!(HeapAllocZeroBytes);
|
|
}
|
|
if !align.is_power_of_two() {
|
|
return err!(HeapAllocNonPowerOfTwoAlignment(align));
|
|
}
|
|
let ptr = self.memory.allocate(size, align, Kind::Rust.into())?;
|
|
self.memory.write_repeat(ptr.into(), 0, size)?;
|
|
self.write_primval(dest, PrimVal::Ptr(ptr), dest_ty)?;
|
|
}
|
|
"alloc::heap::::__rust_dealloc" => {
|
|
let ptr = args[0].into_ptr(&mut self.memory)?.to_ptr()?;
|
|
let old_size = self.value_to_primval(args[1], usize)?.to_u64()?;
|
|
let align = self.value_to_primval(args[2], usize)?.to_u64()?;
|
|
if old_size == 0 {
|
|
return err!(HeapAllocZeroBytes);
|
|
}
|
|
if !align.is_power_of_two() {
|
|
return err!(HeapAllocNonPowerOfTwoAlignment(align));
|
|
}
|
|
self.memory.deallocate(ptr, Some((old_size, align)), Kind::Rust.into())?;
|
|
}
|
|
"alloc::heap::::__rust_realloc" => {
|
|
let ptr = args[0].into_ptr(&mut self.memory)?.to_ptr()?;
|
|
let old_size = self.value_to_primval(args[1], usize)?.to_u64()?;
|
|
let old_align = self.value_to_primval(args[2], usize)?.to_u64()?;
|
|
let new_size = self.value_to_primval(args[3], usize)?.to_u64()?;
|
|
let new_align = self.value_to_primval(args[4], usize)?.to_u64()?;
|
|
if old_size == 0 || new_size == 0 {
|
|
return err!(HeapAllocZeroBytes);
|
|
}
|
|
if !old_align.is_power_of_two() {
|
|
return err!(HeapAllocNonPowerOfTwoAlignment(old_align));
|
|
}
|
|
if !new_align.is_power_of_two() {
|
|
return err!(HeapAllocNonPowerOfTwoAlignment(new_align));
|
|
}
|
|
let new_ptr = self.memory.reallocate(ptr, old_size, old_align, new_size, new_align, Kind::Rust.into())?;
|
|
self.write_primval(dest, PrimVal::Ptr(new_ptr), dest_ty)?;
|
|
}
|
|
|
|
// A Rust function is missing, which means we are running with MIR missing for libstd (or other dependencies).
|
|
// Still, we can make many things mostly work by "emulating" or ignoring some functions.
|
|
"std::io::_print" => {
|
|
trace!("Ignoring output. To run programs that print, make sure you have a libstd with full MIR.");
|
|
}
|
|
"std::thread::Builder::new" => return err!(Unimplemented("miri does not support threading".to_owned())),
|
|
"std::env::args" => return err!(Unimplemented("miri does not support program arguments".to_owned())),
|
|
"std::panicking::panicking" |
|
|
"std::rt::panicking" => {
|
|
// we abort on panic -> `std::rt::panicking` always returns false
|
|
let bool = self.tcx.types.bool;
|
|
self.write_primval(dest, PrimVal::from_bool(false), bool)?;
|
|
}
|
|
_ => return err!(NoMirFor(path)),
|
|
}
|
|
|
|
// 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.
|
|
self.dump_local(dest);
|
|
self.goto_block(dest_block);
|
|
return Ok(());
|
|
}
|
|
}
|