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use PanicMessage type for MIR assertion errors

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This commit is contained in:
Ralf Jung 2019-07-24 10:24:55 +02:00
parent 3694d176a2
commit 495f9509fe
12 changed files with 155 additions and 115 deletions
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127
src/librustc/mir/interpret/error.rs
View File

@ -47,7 +47,7 @@ pub type ConstEvalResult<'tcx> = Result<&'tcx ty::Const<'tcx>, ErrorHandled>;
#[derive(Clone, Debug, RustcEncodable, RustcDecodable)]
pub struct ConstEvalErr<'tcx> {
pub span: Span,
pub error: crate::mir::interpret::InterpError<'tcx, u64>,
pub error: crate::mir::interpret::InterpError<'tcx>,
pub stacktrace: Vec<FrameInfo<'tcx>>,
}
@ -185,10 +185,17 @@ pub fn struct_error<'tcx>(tcx: TyCtxtAt<'tcx>, msg: &str) -> DiagnosticBuilder<'
/// macro for this.
#[derive(Debug, Clone)]
pub struct InterpErrorInfo<'tcx> {
pub kind: InterpError<'tcx, u64>,
pub kind: InterpError<'tcx>,
backtrace: Option<Box<Backtrace>>,
}
impl<'tcx> fmt::Display for InterpErrorInfo<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.kind)
}
}
impl<'tcx> InterpErrorInfo<'tcx> {
pub fn print_backtrace(&mut self) {
if let Some(ref mut backtrace) = self.backtrace {
@ -202,8 +209,8 @@ fn print_backtrace(backtrace: &mut Backtrace) {
eprintln!("\n\nAn error occurred in miri:\n{:?}", backtrace);
}
impl<'tcx> From<InterpError<'tcx, u64>> for InterpErrorInfo<'tcx> {
fn from(kind: InterpError<'tcx, u64>) -> Self {
impl<'tcx> From<InterpError<'tcx>> for InterpErrorInfo<'tcx> {
fn from(kind: InterpError<'tcx>) -> Self {
let backtrace = match env::var("RUST_CTFE_BACKTRACE") {
// Matching `RUST_BACKTRACE` -- we treat "0" the same as "not present".
Ok(ref val) if val != "0" => {
@ -226,8 +233,6 @@ impl<'tcx> From<InterpError<'tcx, u64>> for InterpErrorInfo<'tcx> {
}
}
pub type AssertMessage<'tcx> = InterpError<'tcx, mir::Operand<'tcx>>;
#[derive(Clone, RustcEncodable, RustcDecodable, HashStable)]
pub enum PanicMessage<O> {
Panic {
@ -244,10 +249,68 @@ pub enum PanicMessage<O> {
OverflowNeg,
DivisionByZero,
RemainderByZero,
GeneratorResumedAfterReturn,
GeneratorResumedAfterPanic,
}
/// Type for MIR `Assert` terminator error messages.
pub type AssertMessage<'tcx> = PanicMessage<mir::Operand<'tcx>>;
impl<O> PanicMessage<O> {
/// Getting a description does not require `O` to be printable, and does not
/// require allocation.
/// The caller is expected to handle `Panic` and `BoundsCheck` separately.
pub fn description(&self) -> &'static str {
use PanicMessage::*;
match self {
Overflow(mir::BinOp::Add) =>
"attempt to add with overflow",
Overflow(mir::BinOp::Sub) =>
"attempt to subtract with overflow",
Overflow(mir::BinOp::Mul) =>
"attempt to multiply with overflow",
Overflow(mir::BinOp::Div) =>
"attempt to divide with overflow",
Overflow(mir::BinOp::Rem) =>
"attempt to calculate the remainder with overflow",
OverflowNeg =>
"attempt to negate with overflow",
Overflow(mir::BinOp::Shr) =>
"attempt to shift right with overflow",
Overflow(mir::BinOp::Shl) =>
"attempt to shift left with overflow",
Overflow(op) =>
bug!("{:?} cannot overflow", op),
DivisionByZero =>
"attempt to divide by zero",
RemainderByZero =>
"attempt to calculate the remainder with a divisor of zero",
GeneratorResumedAfterReturn =>
"generator resumed after completion",
GeneratorResumedAfterPanic =>
"generator resumed after panicking",
Panic { .. } | BoundsCheck { .. } =>
bug!("Unexpected PanicMessage"),
}
}
}
impl<O: fmt::Debug> fmt::Debug for PanicMessage<O> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use PanicMessage::*;
match self {
Panic { ref msg, line, col, ref file } =>
write!(f, "the evaluated program panicked at '{}', {}:{}:{}", msg, file, line, col),
BoundsCheck { ref len, ref index } =>
write!(f, "index out of bounds: the len is {:?} but the index is {:?}", len, index),
_ =>
write!(f, "{}", self.description()),
}
}
}
#[derive(Clone, RustcEncodable, RustcDecodable, HashStable)]
pub enum InterpError<'tcx, O> {
pub enum InterpError<'tcx> {
/// This variant is used by machines to signal their own errors that do not
/// match an existing variant.
MachineError(String),
@ -311,7 +374,7 @@ pub enum InterpError<'tcx, O> {
HeapAllocZeroBytes,
HeapAllocNonPowerOfTwoAlignment(u64),
Unreachable,
Panic(PanicMessage<O>),
Panic(PanicMessage<u64>),
ReadFromReturnPointer,
PathNotFound(Vec<String>),
UnimplementedTraitSelection,
@ -322,28 +385,21 @@ pub enum InterpError<'tcx, O> {
/// Cannot compute this constant because it depends on another one
/// which already produced an error
ReferencedConstant,
GeneratorResumedAfterReturn,
GeneratorResumedAfterPanic,
InfiniteLoop,
}
pub type InterpResult<'tcx, T = ()> = Result<T, InterpErrorInfo<'tcx>>;
impl<'tcx> fmt::Display for InterpErrorInfo<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.kind)
}
}
impl<'tcx> fmt::Display for InterpError<'tcx, u64> {
impl<'tcx> fmt::Display for InterpError<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// Forward `Display` to `Debug`
write!(f, "{:?}", self)
}
}
impl<'tcx, O: fmt::Debug> fmt::Debug for InterpError<'tcx, O> {
impl<'tcx> fmt::Debug for InterpError<'tcx> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use self::InterpError::*;
use InterpError::*;
match *self {
PointerOutOfBounds { ptr, msg, allocation_size } => {
write!(f, "{} failed: pointer must be in-bounds at offset {}, \
@ -457,10 +513,6 @@ impl<'tcx, O: fmt::Debug> fmt::Debug for InterpError<'tcx, O> {
write!(f, "encountered overly generic constant"),
ReferencedConstant =>
write!(f, "referenced constant has errors"),
GeneratorResumedAfterReturn =>
write!(f, "generator resumed after completion"),
GeneratorResumedAfterPanic =>
write!(f, "generator resumed after panicking"),
InfiniteLoop =>
write!(f, "duplicate interpreter state observed here, const evaluation will never \
terminate"),
@ -479,33 +531,8 @@ impl<'tcx, O: fmt::Debug> fmt::Debug for InterpError<'tcx, O> {
AbiViolation(ref msg) |
Intrinsic(ref msg) =>
write!(f, "{}", msg),
Panic(PanicMessage::Panic { ref msg, line, col, ref file }) =>
write!(f, "the evaluated program panicked at '{}', {}:{}:{}", msg, file, line, col),
Panic(PanicMessage::BoundsCheck { ref len, ref index }) =>
write!(f, "index out of bounds: the len is {:?} but the index is {:?}", len, index),
Panic(PanicMessage::Overflow(mir::BinOp::Add)) =>
write!(f, "attempt to add with overflow"),
Panic(PanicMessage::Overflow(mir::BinOp::Sub)) =>
write!(f, "attempt to subtract with overflow"),
Panic(PanicMessage::Overflow(mir::BinOp::Mul)) =>
write!(f, "attempt to multiply with overflow"),
Panic(PanicMessage::Overflow(mir::BinOp::Div)) =>
write!(f, "attempt to divide with overflow"),
Panic(PanicMessage::Overflow(mir::BinOp::Rem)) =>
write!(f, "attempt to calculate the remainder with overflow"),
Panic(PanicMessage::OverflowNeg) =>
write!(f, "attempt to negate with overflow"),
Panic(PanicMessage::Overflow(mir::BinOp::Shr)) =>
write!(f, "attempt to shift right with overflow"),
Panic(PanicMessage::Overflow(mir::BinOp::Shl)) =>
write!(f, "attempt to shift left with overflow"),
Panic(PanicMessage::Overflow(op)) =>
bug!("{:?} cannot overflow", op),
Panic(PanicMessage::DivisionByZero) =>
write!(f, "attempt to divide by zero"),
Panic(PanicMessage::RemainderByZero) =>
write!(f, "attempt to calculate the remainder with a divisor of zero"),
Panic(ref msg) =>
write!(f, "{:?}", msg),
}
}
}

31
src/librustc/mir/mod.rs
View File

@ -7,7 +7,7 @@
use crate::hir::def::{CtorKind, Namespace};
use crate::hir::def_id::DefId;
use crate::hir::{self, InlineAsm as HirInlineAsm};
use crate::mir::interpret::{ConstValue, PanicMessage, InterpError::Panic, Scalar};
use crate::mir::interpret::{ConstValue, PanicMessage, Scalar};
use crate::mir::visit::MirVisitable;
use crate::rustc_serialize as serialize;
use crate::ty::adjustment::PointerCast;
@ -3152,13 +3152,16 @@ impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {
}
}
Assert { ref cond, expected, ref msg, target, cleanup } => {
let msg = if let Panic(PanicMessage::BoundsCheck { ref len, ref index }) = *msg {
Panic(PanicMessage::BoundsCheck {
len: len.fold_with(folder),
index: index.fold_with(folder),
})
} else {
msg.clone()
use PanicMessage::*;
let msg = match msg {
BoundsCheck { ref len, ref index } =>
BoundsCheck {
len: len.fold_with(folder),
index: index.fold_with(folder),
},
Panic { .. } | Overflow(_) | OverflowNeg | DivisionByZero | RemainderByZero |
GeneratorResumedAfterReturn | GeneratorResumedAfterPanic =>
msg.clone(),
};
Assert { cond: cond.fold_with(folder), expected, msg, target, cleanup }
}
@ -3197,10 +3200,14 @@ impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {
}
Assert { ref cond, ref msg, .. } => {
if cond.visit_with(visitor) {
if let Panic(PanicMessage::BoundsCheck { ref len, ref index }) = *msg {
len.visit_with(visitor) || index.visit_with(visitor)
} else {
false
use PanicMessage::*;
match msg {
BoundsCheck { ref len, ref index } =>
len.visit_with(visitor) || index.visit_with(visitor),
Panic { .. } | Overflow(_) | OverflowNeg |
DivisionByZero | RemainderByZero |
GeneratorResumedAfterReturn | GeneratorResumedAfterPanic =>
false
}
} else {
false

15
src/librustc/mir/visit.rs
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@ -514,11 +514,16 @@ macro_rules! make_mir_visitor {
fn super_assert_message(&mut self,
msg: & $($mutability)? AssertMessage<'tcx>,
location: Location) {
use crate::mir::interpret::InterpError::*;
use crate::mir::interpret::PanicMessage::BoundsCheck;
if let Panic(BoundsCheck { len, index }) = msg {
self.visit_operand(len, location);
self.visit_operand(index, location);
use crate::mir::interpret::PanicMessage::*;
match msg {
BoundsCheck { len, index } => {
self.visit_operand(len, location);
self.visit_operand(index, location);
}
Panic { .. } | Overflow(_) | OverflowNeg | DivisionByZero | RemainderByZero |
GeneratorResumedAfterReturn | GeneratorResumedAfterPanic => {
// Nothing to visit
}
}
}

10
src/librustc_codegen_ssa/mir/block.rs
View File

@ -368,7 +368,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
// checked operation, just a comparison with the minimum
// value, so we have to check for the assert message.
if !bx.check_overflow() {
if let InterpError::Panic(PanicMessage::OverflowNeg) = *msg {
if let PanicMessage::OverflowNeg = *msg {
const_cond = Some(expected);
}
}
@ -402,8 +402,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let col = bx.const_u32(loc.col.to_usize() as u32 + 1);
// Put together the arguments to the panic entry point.
let (lang_item, args) = match *msg {
InterpError::Panic(PanicMessage::BoundsCheck { ref len, ref index }) => {
let (lang_item, args) = match msg {
PanicMessage::BoundsCheck { ref len, ref index } => {
let len = self.codegen_operand(&mut bx, len).immediate();
let index = self.codegen_operand(&mut bx, index).immediate();
@ -418,8 +418,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
vec![file_line_col, index, len])
}
_ => {
let str = format!("{:?}", msg);
let msg_str = LocalInternedString::intern(&str);
let str = msg.description();
let msg_str = LocalInternedString::intern(str);
let msg_file_line_col = bx.static_panic_msg(
Some(msg_str),
filename,

4
src/librustc_mir/borrow_check/mod.rs
View File

@ -733,8 +733,8 @@ impl<'cx, 'tcx> DataflowResultsConsumer<'cx, 'tcx> for MirBorrowckCtxt<'cx, 'tcx
cleanup: _,
} => {
self.consume_operand(loc, (cond, span), flow_state);
use rustc::mir::interpret::{InterpError::Panic, PanicMessage};
if let Panic(PanicMessage::BoundsCheck { ref len, ref index }) = *msg {
use rustc::mir::interpret::PanicMessage;
if let PanicMessage::BoundsCheck { ref len, ref index } = *msg {
self.consume_operand(loc, (len, span), flow_state);
self.consume_operand(loc, (index, span), flow_state);
}

4
src/librustc_mir/borrow_check/nll/invalidation.rs
View File

@ -207,8 +207,8 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
cleanup: _,
} => {
self.consume_operand(location, cond);
use rustc::mir::interpret::{InterpError::Panic, PanicMessage::BoundsCheck};
if let Panic(BoundsCheck { ref len, ref index }) = *msg {
use rustc::mir::interpret::PanicMessage;
if let PanicMessage::BoundsCheck { ref len, ref index } = *msg {
self.consume_operand(location, len);
self.consume_operand(location, index);
}

4
src/librustc_mir/borrow_check/nll/type_check/mod.rs
View File

@ -28,7 +28,7 @@ use rustc::infer::canonical::QueryRegionConstraints;
use rustc::infer::outlives::env::RegionBoundPairs;
use rustc::infer::{InferCtxt, InferOk, LateBoundRegionConversionTime, NLLRegionVariableOrigin};
use rustc::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
use rustc::mir::interpret::{InterpError::Panic, ConstValue, PanicMessage};
use rustc::mir::interpret::{ConstValue, PanicMessage};
use rustc::mir::tcx::PlaceTy;
use rustc::mir::visit::{PlaceContext, Visitor, NonMutatingUseContext};
use rustc::mir::*;
@ -1606,7 +1606,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
span_mirbug!(self, term, "bad Assert ({:?}, not bool", cond_ty);
}
if let Panic(PanicMessage::BoundsCheck { ref len, ref index }) = *msg {
if let PanicMessage::BoundsCheck { ref len, ref index } = *msg {
if len.ty(body, tcx) != tcx.types.usize {
span_mirbug!(self, len, "bounds-check length non-usize {:?}", len)
}

6
src/librustc_mir/build/expr/as_place.rs
View File

@ -4,7 +4,7 @@ use crate::build::expr::category::Category;
use crate::build::ForGuard::{OutsideGuard, RefWithinGuard};
use crate::build::{BlockAnd, BlockAndExtension, Builder};
use crate::hair::*;
use rustc::mir::interpret::{InterpError::Panic, PanicMessage::BoundsCheck};
use rustc::mir::interpret::{PanicMessage::BoundsCheck};
use rustc::mir::*;
use rustc::ty::{CanonicalUserTypeAnnotation, Variance};
@ -105,10 +105,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
),
);
let msg = Panic(BoundsCheck {
let msg = BoundsCheck {
len: Operand::Move(len),
index: Operand::Copy(Place::from(idx)),
});
};
let success = this.assert(block, Operand::Move(lt), true, msg, expr_span);
success.and(slice.index(idx))
}

13
src/librustc_mir/build/expr/as_rvalue.rs
View File

@ -7,7 +7,7 @@ use crate::build::expr::category::{Category, RvalueFunc};
use crate::build::{BlockAnd, BlockAndExtension, Builder};
use crate::hair::*;
use rustc::middle::region;
use rustc::mir::interpret::{InterpError::Panic, PanicMessage};
use rustc::mir::interpret::PanicMessage;
use rustc::mir::*;
use rustc::ty::{self, CanonicalUserTypeAnnotation, Ty, UpvarSubsts};
use syntax_pos::Span;
@ -101,7 +101,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
block,
Operand::Move(is_min),
false,
Panic(PanicMessage::OverflowNeg),
PanicMessage::OverflowNeg,
expr_span,
);
}
@ -401,7 +401,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let val = result_value.clone().field(val_fld, ty);
let of = result_value.field(of_fld, bool_ty);
let err = Panic(PanicMessage::Overflow(op));
let err = PanicMessage::Overflow(op);
block = self.assert(block, Operand::Move(of), false, err, span);
@ -411,11 +411,12 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Checking division and remainder is more complex, since we 1. always check
// and 2. there are two possible failure cases, divide-by-zero and overflow.
let (zero_err, overflow_err) = if op == BinOp::Div {
(Panic(PanicMessage::DivisionByZero), Panic(PanicMessage::Overflow(op)))
let zero_err = if op == BinOp::Div {
PanicMessage::DivisionByZero
} else {
(Panic(PanicMessage::RemainderByZero), Panic(PanicMessage::Overflow(op)))
PanicMessage::RemainderByZero
};
let overflow_err = PanicMessage::Overflow(op);
// Check for / 0
let is_zero = self.temp(bool_ty, span);

35
src/librustc_mir/interpret/terminator.rs
View File

@ -7,7 +7,7 @@ use syntax::source_map::Span;
use rustc_target::spec::abi::Abi;
use super::{
InterpResult, PointerArithmetic, InterpError, Scalar, PanicMessage,
InterpResult, PointerArithmetic, InterpError, Scalar,
InterpCx, Machine, Immediate, OpTy, ImmTy, PlaceTy, MPlaceTy, StackPopCleanup, FnVal,
};
@ -135,28 +135,31 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
self.goto_block(Some(target))?;
} else {
// Compute error message
use rustc::mir::interpret::InterpError::*;
return match *msg {
Panic(PanicMessage::BoundsCheck { ref len, ref index }) => {
use rustc::mir::interpret::PanicMessage::*;
return match msg {
BoundsCheck { ref len, ref index } => {
let len = self.read_immediate(self.eval_operand(len, None)?)
.expect("can't eval len").to_scalar()?
.to_bits(self.memory().pointer_size())? as u64;
let index = self.read_immediate(self.eval_operand(index, None)?)
.expect("can't eval index").to_scalar()?
.to_bits(self.memory().pointer_size())? as u64;
err!(Panic(PanicMessage::BoundsCheck { len, index }))
err!(Panic(BoundsCheck { len, index }))
}
Panic(PanicMessage::Overflow(op)) =>
Err(Panic(PanicMessage::Overflow(op)).into()),
Panic(PanicMessage::OverflowNeg) =>
Err(Panic(PanicMessage::OverflowNeg).into()),
Panic(PanicMessage::DivisionByZero) =>
Err(Panic(PanicMessage::DivisionByZero).into()),
Panic(PanicMessage::RemainderByZero) =>
Err(Panic(PanicMessage::RemainderByZero).into()),
GeneratorResumedAfterReturn |
GeneratorResumedAfterPanic => unimplemented!(),
_ => bug!(),
Overflow(op) =>
err!(Panic(Overflow(*op))),
OverflowNeg =>
err!(Panic(OverflowNeg)),
DivisionByZero =>
err!(Panic(DivisionByZero)),
RemainderByZero =>
err!(Panic(RemainderByZero)),
GeneratorResumedAfterReturn =>
err!(Panic(GeneratorResumedAfterReturn)),
GeneratorResumedAfterPanic =>
err!(Panic(GeneratorResumedAfterPanic)),
Panic { .. } =>
bug!("`Panic` variant cannot occur in MIR"),
};
}
}

19
src/librustc_mir/transform/const_prop.rs
View File

@ -13,7 +13,7 @@ use rustc::mir::{
use rustc::mir::visit::{
Visitor, PlaceContext, MutatingUseContext, MutVisitor, NonMutatingUseContext,
};
use rustc::mir::interpret::{InterpError::Panic, Scalar, GlobalId, InterpResult, PanicMessage};
use rustc::mir::interpret::{Scalar, GlobalId, InterpResult, InterpError, PanicMessage};
use rustc::ty::{self, Instance, ParamEnv, Ty, TyCtxt};
use syntax_pos::{Span, DUMMY_SP};
use rustc::ty::subst::InternalSubsts;
@ -314,8 +314,6 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
| HeapAllocNonPowerOfTwoAlignment(_)
| Unreachable
| ReadFromReturnPointer
| GeneratorResumedAfterReturn
| GeneratorResumedAfterPanic
| ReferencedConstant
| InfiniteLoop
=> {
@ -595,7 +593,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
)
} else {
if overflow {
let err = Panic(PanicMessage::Overflow(op)).into();
let err = InterpError::Panic(PanicMessage::Overflow(op)).into();
let _: Option<()> = self.use_ecx(source_info, |_| Err(err));
return None;
}
@ -831,14 +829,13 @@ impl<'mir, 'tcx> MutVisitor<'tcx> for ConstPropagator<'mir, 'tcx> {
.hir()
.as_local_hir_id(self.source.def_id())
.expect("some part of a failing const eval must be local");
use rustc::mir::interpret::InterpError::*;
let msg = match msg {
Panic(PanicMessage::Overflow(_)) |
Panic(PanicMessage::OverflowNeg) |
Panic(PanicMessage::DivisionByZero) |
Panic(PanicMessage::RemainderByZero) =>
format!("{:?}", msg),
Panic(PanicMessage::BoundsCheck { ref len, ref index }) => {
PanicMessage::Overflow(_) |
PanicMessage::OverflowNeg |
PanicMessage::DivisionByZero |
PanicMessage::RemainderByZero =>
msg.description().to_owned(),
PanicMessage::BoundsCheck { ref len, ref index } => {
let len = self
.eval_operand(len, source_info)
.expect("len must be const");

2
src/librustc_mir/transform/generator.rs
View File

@ -1016,7 +1016,7 @@ fn create_generator_resume_function<'tcx>(
let mut cases = create_cases(body, &transform, |point| Some(point.resume));
use rustc::mir::interpret::InterpError::{
use rustc::mir::interpret::PanicMessage::{
GeneratorResumedAfterPanic,
GeneratorResumedAfterReturn,
};