//! Main evaluator loop and setting up the initial stack frame.
+use std::collections::HashSet;
use std::ffi::OsStr;
use std::iter;
+use std::panic::{self, AssertUnwindSafe};
+use std::thread;
use log::info;
use rustc_session::config::EntryFnType;
-use rustc_span::DUMMY_SP;
-use std::collections::HashSet;
-
use crate::*;
#[derive(Copy, Clone, Debug, PartialEq)]
pub stacked_borrows: bool,
/// Controls alignment checking.
pub check_alignment: AlignmentCheck,
- /// Controls integer and float validity (e.g., initialization) checking.
- pub check_number_validity: bool,
/// Controls function [ABI](Abi) checking.
pub check_abi: bool,
/// Action for an op requiring communication with the host.
/// The seed to use when non-determinism or randomness are required (e.g. ptr-to-int cast, `getrandom()`).
pub seed: Option<u64>,
/// The stacked borrows pointer ids to report about
- pub tracked_pointer_tags: HashSet<PtrId>,
+ pub tracked_pointer_tags: HashSet<SbTag>,
/// The stacked borrows call IDs to report about
pub tracked_call_ids: HashSet<CallId>,
/// The allocation ids to report about.
pub tracked_alloc_ids: HashSet<AllocId>,
- /// Whether to track raw pointers in stacked borrows.
- pub tag_raw: bool,
/// Determine if data race detection should be enabled
pub data_race_detector: bool,
+ /// Determine if weak memory emulation should be enabled. Requires data race detection to be enabled
+ pub weak_memory_emulation: bool,
+ /// Track when an outdated (weak memory) load happens.
+ pub track_outdated_loads: bool,
/// Rate of spurious failures for compare_exchange_weak atomic operations,
/// between 0.0 and 1.0, defaulting to 0.8 (80% chance of failure).
pub cmpxchg_weak_failure_rate: f64,
pub panic_on_unsupported: bool,
/// Which style to use for printing backtraces.
pub backtrace_style: BacktraceStyle,
- /// Whether to enforce "strict provenance" rules. Enabling this means int2ptr casts return
- /// pointers with an invalid provenance, i.e., not valid for any memory access.
- pub strict_provenance: bool,
+ /// Which provenance to use for int2ptr casts
+ pub provenance_mode: ProvenanceMode,
+ /// Whether to ignore any output by the program. This is helpful when debugging miri
+ /// as its messages don't get intermingled with the program messages.
+ pub mute_stdout_stderr: bool,
+ /// The probability of the active thread being preempted at the end of each basic block.
+ pub preemption_rate: f64,
+ /// Report the current instruction being executed every N basic blocks.
+ pub report_progress: Option<u32>,
+ /// Whether Stacked Borrows retagging should recurse into fields of datatypes.
+ pub retag_fields: bool,
}
impl Default for MiriConfig {
validate: true,
stacked_borrows: true,
check_alignment: AlignmentCheck::Int,
- check_number_validity: false,
check_abi: true,
isolated_op: IsolatedOp::Reject(RejectOpWith::Abort),
ignore_leaks: false,
tracked_pointer_tags: HashSet::default(),
tracked_call_ids: HashSet::default(),
tracked_alloc_ids: HashSet::default(),
- tag_raw: false,
data_race_detector: true,
- cmpxchg_weak_failure_rate: 0.8,
+ weak_memory_emulation: true,
+ track_outdated_loads: false,
+ cmpxchg_weak_failure_rate: 0.8, // 80%
measureme_out: None,
panic_on_unsupported: false,
backtrace_style: BacktraceStyle::Short,
- strict_provenance: false,
+ provenance_mode: ProvenanceMode::Default,
+ mute_stdout_stderr: false,
+ preemption_rate: 0.01, // 1%
+ report_progress: None,
+ retag_fields: false,
}
}
}
entry_id: DefId,
entry_type: EntryFnType,
config: &MiriConfig,
-) -> InterpResult<'tcx, (InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>, MPlaceTy<'tcx, Tag>)> {
+) -> InterpResult<'tcx, (InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>, MPlaceTy<'tcx, Provenance>)> {
let param_env = ty::ParamEnv::reveal_all();
let layout_cx = LayoutCx { tcx, param_env };
let mut ecx = InterpCx::new(
param_env,
Evaluator::new(config, layout_cx),
);
+
+ // Capture the current interpreter stack state (which should be empty) so that we can emit
+ // allocation-tracking and tag-tracking diagnostics for allocations which are part of the
+ // early runtime setup.
+ let info = ecx.preprocess_diagnostics();
+
// Some parts of initialization require a full `InterpCx`.
Evaluator::late_init(&mut ecx, config)?;
// Make sure we have MIR. We check MIR for some stable monomorphic function in libcore.
- let sentinel = ecx.resolve_path(&["core", "ascii", "escape_default"]);
- if !tcx.is_mir_available(sentinel.def.def_id()) {
- tcx.sess.fatal("the current sysroot was built without `-Zalways-encode-mir`. Use `cargo miri setup` to prepare a sysroot that is suitable for Miri.");
+ let sentinel = ecx.try_resolve_path(&["core", "ascii", "escape_default"]);
+ if !matches!(sentinel, Some(s) if tcx.is_mir_available(s.def.def_id())) {
+ tcx.sess.fatal(
+ "the current sysroot was built without `-Zalways-encode-mir`, or libcore seems missing. \
+ Use `cargo miri setup` to prepare a sysroot that is suitable for Miri."
+ );
}
- // Setup first stack-frame
+ // Setup first stack frame.
let entry_instance = ty::Instance::mono(tcx, entry_id);
- // First argument is constructed later, because its skipped if the entry function uses #[start]
+ // First argument is constructed later, because it's skipped if the entry function uses #[start].
// Second argument (argc): length of `config.args`.
let argc = Scalar::from_machine_usize(u64::try_from(config.args.len()).unwrap(), &ecx);
// Third argument (`argv`): created from `config.args`.
let argv = {
// Put each argument in memory, collect pointers.
- let mut argvs = Vec::<Immediate<Tag>>::new();
+ let mut argvs = Vec::<Immediate<Provenance>>::new();
for arg in config.args.iter() {
// Make space for `0` terminator.
let size = u64::try_from(arg.len()).unwrap().checked_add(1).unwrap();
let arg_place =
ecx.allocate(ecx.layout_of(arg_type)?, MiriMemoryKind::Machine.into())?;
ecx.write_os_str_to_c_str(OsStr::new(arg), arg_place.ptr, size)?;
- ecx.mark_immutable(&*arg_place);
+ ecx.mark_immutable(&arg_place);
argvs.push(arg_place.to_ref(&ecx));
}
// Make an array with all these pointers, in the Miri memory.
let place = ecx.mplace_field(&argvs_place, idx)?;
ecx.write_immediate(arg, &place.into())?;
}
- ecx.mark_immutable(&*argvs_place);
+ ecx.mark_immutable(&argvs_place);
// A pointer to that place is the 3rd argument for main.
let argv = argvs_place.to_ref(&ecx);
// Store `argc` and `argv` for macOS `_NSGetArg{c,v}`.
let argc_place =
ecx.allocate(ecx.machine.layouts.isize, MiriMemoryKind::Machine.into())?;
ecx.write_scalar(argc, &argc_place.into())?;
- ecx.mark_immutable(&*argc_place);
+ ecx.mark_immutable(&argc_place);
ecx.machine.argc = Some(*argc_place);
let argv_place = ecx.allocate(
MiriMemoryKind::Machine.into(),
)?;
ecx.write_immediate(argv, &argv_place.into())?;
- ecx.mark_immutable(&*argv_place);
+ ecx.mark_immutable(&argv_place);
ecx.machine.argv = Some(*argv_place);
}
// Store command line as UTF-16 for Windows `GetCommandLineW`.
let place = ecx.mplace_field(&cmd_place, idx)?;
ecx.write_scalar(Scalar::from_u16(c), &place.into())?;
}
- ecx.mark_immutable(&*cmd_place);
+ ecx.mark_immutable(&cmd_place);
}
argv
};
}
}
+ // Emit any diagnostics related to the setup process for the runtime, so that when the
+ // interpreter loop starts there are no unprocessed diagnostics.
+ ecx.process_diagnostics(info);
+
Ok((ecx, ret_place))
}
};
// Perform the main execution.
- let res: InterpResult<'_, i64> = (|| {
+ let res: thread::Result<InterpResult<'_, i64>> = panic::catch_unwind(AssertUnwindSafe(|| {
// Main loop.
loop {
let info = ecx.preprocess_diagnostics();
match ecx.schedule()? {
SchedulingAction::ExecuteStep => {
- if let Some(sb) = ecx.machine.stacked_borrows.as_mut() {
- sb.get_mut().current_span = DUMMY_SP;
- }
assert!(ecx.step()?, "a terminated thread was scheduled for execution");
}
SchedulingAction::ExecuteTimeoutCallback => {
}
let return_code = ecx.read_scalar(&ret_place.into())?.to_machine_isize(&ecx)?;
Ok(return_code)
- })();
-
- // Machine cleanup.
- EnvVars::cleanup(&mut ecx).unwrap();
+ }));
+ let res = res.unwrap_or_else(|panic_payload| {
+ ecx.handle_ice();
+ panic::resume_unwind(panic_payload)
+ });
+
+ // Machine cleanup. Only do this if all threads have terminated; threads that are still running
+ // might cause data races (https://github.com/rust-lang/miri/issues/2020) or Stacked Borrows
+ // errors (https://github.com/rust-lang/miri/issues/2396) if we deallocate here.
+ if ecx.have_all_terminated() {
+ EnvVars::cleanup(&mut ecx).unwrap();
+ }
// Process the result.
match res {
/// The string will be UTF-16 encoded and NUL terminated.
///
/// Panics if the zeroth argument contains the `"` character because doublequotes
-/// in argv[0] cannot be encoded using the standard command line parsing rules.
+/// in `argv[0]` cannot be encoded using the standard command line parsing rules.
///
/// Further reading:
/// * [Parsing C++ command-line arguments](https://docs.microsoft.com/en-us/cpp/cpp/main-function-command-line-args?view=msvc-160#parsing-c-command-line-arguments)
let cmd = String::from_utf16_lossy(&args_to_utf16_command_string(
[r"C:\Program Files\", "arg1", "arg 2", "arg \" 3"].iter(),
));
- assert_eq!(cmd.trim_end_matches("\0"), r#""C:\Program Files\" arg1 "arg 2" "arg \" 3""#);
+ assert_eq!(cmd.trim_end_matches('\0'), r#""C:\Program Files\" arg1 "arg 2" "arg \" 3""#);
}
}
projects / rust.git / blobdiff