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Refactor sync shims with setters and getters

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This commit is contained in:
David Cook 2020-03-22 15:18:02 -05:00
parent fd94255b9d
commit 141319a412
1 changed files with 219 additions and 181 deletions
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400
src/shims/sync.rs
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@ -6,26 +6,16 @@ use crate::*;
impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
// pthread_mutexattr_t is either 4 or 8 bytes, depending on the platform
// memory layout: store an i32 in the first four bytes equal to the
// corresponding libc mutex kind constant (i.e. PTHREAD_MUTEX_NORMAL)
fn pthread_mutexattr_init(&mut self, attr_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following write at an offset to the attr pointer is within bounds
assert_ptr_target_min_size(this, attr_op, 4)?;
let attr = this.read_scalar(attr_op)?.not_undef()?;
if this.is_null(attr)? {
return this.eval_libc_i32("EINVAL");
}
let attr_place = this.deref_operand(attr_op)?;
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let kind_place = attr_place.offset(Size::ZERO, MemPlaceMeta::None, i32_layout, this)?;
let default_kind = this.eval_libc("PTHREAD_MUTEX_DEFAULT")?;
this.write_scalar(default_kind, kind_place.into())?;
mutexattr_set_kind(this, attr_op, default_kind)?;
Ok(0)
}
@ -37,22 +27,17 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following write at an offset to the attr pointer is within bounds
assert_ptr_target_min_size(this, attr_op, 4)?;
let attr = this.read_scalar(attr_op)?.not_undef()?;
if this.is_null(attr)? {
return this.eval_libc_i32("EINVAL");
}
let kind = this.read_scalar(kind_op)?.not_undef()?;
if kind == this.eval_libc("PTHREAD_MUTEX_NORMAL")? ||
kind == this.eval_libc("PTHREAD_MUTEX_ERRORCHECK")? ||
kind == this.eval_libc("PTHREAD_MUTEX_RECURSIVE")? {
let attr_place = this.deref_operand(attr_op)?;
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let kind_place = attr_place.offset(Size::ZERO, MemPlaceMeta::None, i32_layout, this)?;
this.write_scalar(kind, kind_place.into())?;
if kind == this.eval_libc("PTHREAD_MUTEX_NORMAL")?
|| kind == this.eval_libc("PTHREAD_MUTEX_ERRORCHECK")?
|| kind == this.eval_libc("PTHREAD_MUTEX_RECURSIVE")?
{
mutexattr_set_kind(this, attr_op, kind)?;
} else {
let einval = this.eval_libc_i32("EINVAL")?;
return Ok(einval);
@ -64,30 +49,16 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_mutexattr_destroy(&mut self, attr_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following write at an offset to the attr pointer is within bounds
assert_ptr_target_min_size(this, attr_op, 4)?;
let attr = this.read_scalar(attr_op)?.not_undef()?;
if this.is_null(attr)? {
return this.eval_libc_i32("EINVAL");
}
let attr_place = this.deref_operand(attr_op)?;
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let kind_place = attr_place.offset(Size::ZERO, MemPlaceMeta::None, i32_layout, this)?;
this.write_scalar(ScalarMaybeUndef::Undef, kind_place.into())?;
mutexattr_set_kind(this, attr_op, ScalarMaybeUndef::Undef)?;
Ok(0)
}
// pthread_mutex_t is between 24 and 48 bytes, depending on the platform
// memory layout:
// bytes 0-3: reserved for signature on macOS
// bytes 4-7: count of how many times this mutex has been locked, as a u32
// bytes 12-15: mutex kind, as an i32
// (the kind should be at this offset for compatibility with the static
// initializer macro)
fn pthread_mutex_init(
&mut self,
mutex_op: OpTy<'tcx, Tag>,
@ -95,34 +66,20 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following writes at offsets to the mutex pointer are within bounds
assert_ptr_target_min_size(this, mutex_op, 16)?;
// Ensure that the following read at an offset to the attr pointer is within bounds
assert_ptr_target_min_size(this, attr_op, 4)?;
let mutex = this.read_scalar(mutex_op)?.not_undef()?;
if this.is_null(mutex)? {
return this.eval_libc_i32("EINVAL");
}
let mutex_place = this.deref_operand(mutex_op)?;
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let attr = this.read_scalar(attr_op)?.not_undef()?;
let kind = if this.is_null(attr)? {
this.eval_libc("PTHREAD_MUTEX_DEFAULT")?
} else {
let attr_place = this.deref_operand(attr_op)?;
let attr_kind_place = attr_place.offset(Size::ZERO, MemPlaceMeta::None, i32_layout, this)?;
this.read_scalar(attr_kind_place.into())?.not_undef()?
mutexattr_get_kind(this, attr_op)?.not_undef()?
};
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let locked_count_place = mutex_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
this.write_scalar(Scalar::from_u32(0), locked_count_place.into())?;
let mutex_kind_place = mutex_place.offset(Size::from_bytes(12), MemPlaceMeta::None, i32_layout, &*this.tcx)?;
this.write_scalar(kind, mutex_kind_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(0))?;
mutex_set_kind(this, mutex_op, kind)?;
Ok(0)
}
@ -130,39 +87,30 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_mutex_lock(&mut self, mutex_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and writes at offsets to the mutex pointer are within bounds
assert_ptr_target_min_size(this, mutex_op, 16)?;
let mutex = this.read_scalar(mutex_op)?.not_undef()?;
if this.is_null(mutex)? {
return this.eval_libc_i32("EINVAL");
}
let mutex_place = this.deref_operand(mutex_op)?;
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let kind_place = mutex_place.offset(Size::from_bytes(12), MemPlaceMeta::None, i32_layout, this)?;
let kind = this.read_scalar(kind_place.into())?.not_undef()?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let locked_count_place = mutex_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let locked_count = this.read_scalar(locked_count_place.into())?.to_u32()?;
let kind = mutex_get_kind(this, mutex_op)?.not_undef()?;
let locked_count = mutex_get_locked_count(this, mutex_op)?.to_u32()?;
if kind == this.eval_libc("PTHREAD_MUTEX_NORMAL")? {
if locked_count == 0 {
this.write_scalar(Scalar::from_u32(1), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(1))?;
Ok(0)
} else {
throw_unsup_format!("Deadlock due to locking a PTHREAD_MUTEX_NORMAL mutex twice");
}
} else if kind == this.eval_libc("PTHREAD_MUTEX_ERRORCHECK")? {
if locked_count == 0 {
this.write_scalar(Scalar::from_u32(1), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(1))?;
Ok(0)
} else {
this.eval_libc_i32("EDEADLK")
}
} else if kind == this.eval_libc("PTHREAD_MUTEX_RECURSIVE")? {
this.write_scalar(Scalar::from_u32(locked_count + 1), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(locked_count + 1))?;
Ok(0)
} else {
this.eval_libc_i32("EINVAL")
@ -172,33 +120,25 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_mutex_trylock(&mut self, mutex_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and writes at offsets to the mutex pointer are within bounds
assert_ptr_target_min_size(this, mutex_op, 16)?;
let mutex = this.read_scalar(mutex_op)?.not_undef()?;
if this.is_null(mutex)? {
return this.eval_libc_i32("EINVAL");
}
let mutex_place = this.deref_operand(mutex_op)?;
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let kind_place = mutex_place.offset(Size::from_bytes(12), MemPlaceMeta::None, i32_layout, this)?;
let kind = this.read_scalar(kind_place.into())?.not_undef()?;
let kind = mutex_get_kind(this, mutex_op)?.not_undef()?;
let locked_count = mutex_get_locked_count(this, mutex_op)?.to_u32()?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let locked_count_place = mutex_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let locked_count = this.read_scalar(locked_count_place.into())?.to_u32()?;
if kind == this.eval_libc("PTHREAD_MUTEX_NORMAL")? ||
kind == this.eval_libc("PTHREAD_MUTEX_ERRORCHECK")? {
if kind == this.eval_libc("PTHREAD_MUTEX_NORMAL")?
|| kind == this.eval_libc("PTHREAD_MUTEX_ERRORCHECK")?
{
if locked_count == 0 {
this.write_scalar(Scalar::from_u32(1), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(1))?;
Ok(0)
} else {
this.eval_libc_i32("EBUSY")
}
} else if kind == this.eval_libc("PTHREAD_MUTEX_RECURSIVE")? {
this.write_scalar(Scalar::from_u32(locked_count + 1), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(locked_count + 1))?;
Ok(0)
} else {
this.eval_libc_i32("EINVAL")
@ -208,40 +148,33 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_mutex_unlock(&mut self, mutex_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and writes at offsets to the mutex pointer are within bounds
assert_ptr_target_min_size(this, mutex_op, 16)?;
let mutex = this.read_scalar(mutex_op)?.not_undef()?;
if this.is_null(mutex)? {
return this.eval_libc_i32("EINVAL");
}
let mutex_place = this.deref_operand(mutex_op)?;
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let kind_place = mutex_place.offset(Size::from_bytes(12), MemPlaceMeta::None, i32_layout, this)?;
let kind = this.read_scalar(kind_place.into())?.not_undef()?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let locked_count_place = mutex_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let locked_count = this.read_scalar(locked_count_place.into())?.to_u32()?;
let kind = mutex_get_kind(this, mutex_op)?.not_undef()?;
let locked_count = mutex_get_locked_count(this, mutex_op)?.to_u32()?;
if kind == this.eval_libc("PTHREAD_MUTEX_NORMAL")? {
if locked_count == 1 {
this.write_scalar(Scalar::from_u32(0), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(0))?;
Ok(0)
} else {
throw_ub_format!("Attempted to unlock a PTHREAD_MUTEX_NORMAL mutex that was not locked");
throw_ub_format!(
"Attempted to unlock a PTHREAD_MUTEX_NORMAL mutex that was not locked"
);
}
} else if kind == this.eval_libc("PTHREAD_MUTEX_ERRORCHECK")? {
if locked_count == 1 {
this.write_scalar(Scalar::from_u32(0), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(0))?;
Ok(0)
} else {
this.eval_libc_i32("EPERM")
}
} else if kind == this.eval_libc("PTHREAD_MUTEX_RECURSIVE")? {
if locked_count > 0 {
this.write_scalar(Scalar::from_u32(locked_count - 1), locked_count_place.into())?;
mutex_set_locked_count(this, mutex_op, Scalar::from_u32(locked_count - 1))?;
Ok(0)
} else {
this.eval_libc_i32("EPERM")
@ -254,56 +187,37 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_mutex_destroy(&mut self, mutex_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following read and writes at offsets to the mutex pointer are within bounds
assert_ptr_target_min_size(this, mutex_op, 16)?;
let mutex = this.read_scalar(mutex_op)?.not_undef()?;
if this.is_null(mutex)? {
return this.eval_libc_i32("EINVAL");
}
let mutex_place = this.deref_operand(mutex_op)?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let locked_count_place = mutex_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
if this.read_scalar(locked_count_place.into())?.to_u32()? != 0 {
if mutex_get_locked_count(this, mutex_op)?.to_u32()? != 0 {
return this.eval_libc_i32("EBUSY");
}
let i32_layout = this.layout_of(this.tcx.types.i32)?;
let kind_place = mutex_place.offset(Size::from_bytes(12), MemPlaceMeta::None, i32_layout, this)?;
this.write_scalar(ScalarMaybeUndef::Undef, kind_place.into())?;
this.write_scalar(ScalarMaybeUndef::Undef, locked_count_place.into())?;
mutex_set_kind(this, mutex_op, ScalarMaybeUndef::Undef)?;
mutex_set_locked_count(this, mutex_op, ScalarMaybeUndef::Undef)?;
Ok(0)
}
// pthread_rwlock_t is between 32 and 56 bytes, depending on the platform
// memory layout:
// bytes 0-3: reserved for signature on macOS
// bytes 4-7: reader count, as a u32
// bytes 8-11: writer count, as a u32
fn pthread_rwlock_rdlock(&mut self, rwlock_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and write at offsets to the rwlock pointer are within bounds
assert_ptr_target_min_size(this, rwlock_op, 12)?;
let rwlock = this.read_scalar(rwlock_op)?.not_undef()?;
if this.is_null(rwlock)? {
return this.eval_libc_i32("EINVAL");
}
let rwlock_place = this.deref_operand(rwlock_op)?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let readers_place = rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let writers_place = rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, this)?;
let readers = this.read_scalar(readers_place.into())?.to_u32()?;
let writers = this.read_scalar(writers_place.into())?.to_u32()?;
let readers = rwlock_get_readers(this, rwlock_op)?.to_u32()?;
let writers = rwlock_get_writers(this, rwlock_op)?.to_u32()?;
if writers != 0 {
throw_unsup_format!("Deadlock due to read-locking a pthreads read-write lock while it is already write-locked");
throw_unsup_format!(
"Deadlock due to read-locking a pthreads read-write lock while it is already write-locked"
);
} else {
this.write_scalar(Scalar::from_u32(readers + 1), readers_place.into())?;
rwlock_set_readers(this, rwlock_op, Scalar::from_u32(readers + 1))?;
Ok(0)
}
}
@ -311,24 +225,17 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_rwlock_tryrdlock(&mut self, rwlock_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and write at offsets to the rwlock pointer are within bounds
assert_ptr_target_min_size(this, rwlock_op, 12)?;
let rwlock = this.read_scalar(rwlock_op)?.not_undef()?;
if this.is_null(rwlock)? {
return this.eval_libc_i32("EINVAL");
}
let rwlock_place = this.deref_operand(rwlock_op)?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let readers_place = rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let writers_place = rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, this)?;
let readers = this.read_scalar(readers_place.into())?.to_u32()?;
let writers = this.read_scalar(writers_place.into())?.to_u32()?;
let readers = rwlock_get_readers(this, rwlock_op)?.to_u32()?;
let writers = rwlock_get_writers(this, rwlock_op)?.to_u32()?;
if writers != 0 {
this.eval_libc_i32("EBUSY")
} else {
this.write_scalar(Scalar::from_u32(readers + 1), readers_place.into())?;
rwlock_set_readers(this, rwlock_op, Scalar::from_u32(readers + 1))?;
Ok(0)
}
}
@ -336,26 +243,23 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_rwlock_wrlock(&mut self, rwlock_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and write at offsets to the rwlock pointer are within bounds
assert_ptr_target_min_size(this, rwlock_op, 12)?;
let rwlock = this.read_scalar(rwlock_op)?.not_undef()?;
if this.is_null(rwlock)? {
return this.eval_libc_i32("EINVAL");
}
let rwlock_place = this.deref_operand(rwlock_op)?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let readers_place = rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let writers_place = rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, this)?;
let readers = this.read_scalar(readers_place.into())?.to_u32()?;
let writers = this.read_scalar(writers_place.into())?.to_u32()?;
let readers = rwlock_get_readers(this, rwlock_op)?.to_u32()?;
let writers = rwlock_get_writers(this, rwlock_op)?.to_u32()?;
if readers != 0 {
throw_unsup_format!("Deadlock due to write-locking a pthreads read-write lock while it is already read-locked");
throw_unsup_format!(
"Deadlock due to write-locking a pthreads read-write lock while it is already read-locked"
);
} else if writers != 0 {
throw_unsup_format!("Deadlock due to write-locking a pthreads read-write lock while it is already write-locked");
throw_unsup_format!(
"Deadlock due to write-locking a pthreads read-write lock while it is already write-locked"
);
} else {
this.write_scalar(Scalar::from_u32(1), writers_place.into())?;
rwlock_set_writers(this, rwlock_op, Scalar::from_u32(1))?;
Ok(0)
}
}
@ -363,24 +267,17 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_rwlock_trywrlock(&mut self, rwlock_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and write at offsets to the rwlock pointer are within bounds
assert_ptr_target_min_size(this, rwlock_op, 12)?;
let rwlock = this.read_scalar(rwlock_op)?.not_undef()?;
if this.is_null(rwlock)? {
return this.eval_libc_i32("EINVAL");
}
let rwlock_place = this.deref_operand(rwlock_op)?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let readers_place = rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let writers_place = rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, this)?;
let readers = this.read_scalar(readers_place.into())?.to_u32()?;
let writers = this.read_scalar(writers_place.into())?.to_u32()?;
let readers = rwlock_get_readers(this, rwlock_op)?.to_u32()?;
let writers = rwlock_get_writers(this, rwlock_op)?.to_u32()?;
if readers != 0 || writers != 0 {
this.eval_libc_i32("EBUSY")
} else {
this.write_scalar(Scalar::from_u32(1), writers_place.into())?;
rwlock_set_writers(this, rwlock_op, Scalar::from_u32(1))?;
Ok(0)
}
}
@ -388,25 +285,18 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_rwlock_unlock(&mut self, rwlock_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and writes at offsets to the rwlock pointer are within bounds
assert_ptr_target_min_size(this, rwlock_op, 12)?;
let rwlock = this.read_scalar(rwlock_op)?.not_undef()?;
if this.is_null(rwlock)? {
return this.eval_libc_i32("EINVAL");
}
let rwlock_place = this.deref_operand(rwlock_op)?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let readers_place = rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
let writers_place = rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, this)?;
let readers = this.read_scalar(readers_place.into())?.to_u32()?;
let writers = this.read_scalar(writers_place.into())?.to_u32()?;
let readers = rwlock_get_readers(this, rwlock_op)?.to_u32()?;
let writers = rwlock_get_writers(this, rwlock_op)?.to_u32()?;
if readers != 0 {
this.write_scalar(Scalar::from_u32(readers - 1), readers_place.into())?;
rwlock_set_readers(this, rwlock_op, Scalar::from_u32(readers - 1))?;
Ok(0)
} else if writers != 0 {
this.write_scalar(Scalar::from_u32(0), writers_place.into())?;
rwlock_set_writers(this, rwlock_op, Scalar::from_u32(0))?;
Ok(0)
} else {
this.eval_libc_i32("EPERM")
@ -416,38 +306,186 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
fn pthread_rwlock_destroy(&mut self, rwlock_op: OpTy<'tcx, Tag>) -> InterpResult<'tcx, i32> {
let this = self.eval_context_mut();
// Ensure that the following reads and writes at offsets to the rwlock pointer are within bounds
assert_ptr_target_min_size(this, rwlock_op, 12)?;
let rwlock = this.read_scalar(rwlock_op)?.not_undef()?;
if this.is_null(rwlock)? {
return this.eval_libc_i32("EINVAL");
}
let rwlock_place = this.deref_operand(rwlock_op)?;
let u32_layout = this.layout_of(this.tcx.types.u32)?;
let readers_place = rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, this)?;
if this.read_scalar(readers_place.into())?.to_u32()? != 0 {
if rwlock_get_readers(this, rwlock_op)?.to_u32()? != 0 {
return this.eval_libc_i32("EBUSY");
}
let writers_place = rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, this)?;
if this.read_scalar(writers_place.into())?.to_u32()? != 0 {
if rwlock_get_writers(this, rwlock_op)?.to_u32()? != 0 {
return this.eval_libc_i32("EBUSY");
}
this.write_scalar(ScalarMaybeUndef::Undef, readers_place.into())?;
this.write_scalar(ScalarMaybeUndef::Undef, writers_place.into())?;
rwlock_set_readers(this, rwlock_op, ScalarMaybeUndef::Undef)?;
rwlock_set_writers(this, rwlock_op, ScalarMaybeUndef::Undef)?;
Ok(0)
}
}
fn assert_ptr_target_min_size<'mir, 'tcx: 'mir>(ecx: &MiriEvalContext<'mir, 'tcx>, operand: OpTy<'tcx, Tag>, min_size: u64) -> InterpResult<'tcx, ()> {
fn assert_ptr_target_min_size<'mir, 'tcx: 'mir>(
ecx: &MiriEvalContext<'mir, 'tcx>,
operand: OpTy<'tcx, Tag>,
min_size: u64,
) -> InterpResult<'tcx, ()> {
let target_ty = match operand.layout.ty.kind {
TyKind::RawPtr(TypeAndMut{ ty, mutbl: _ }) => ty,
TyKind::RawPtr(TypeAndMut { ty, mutbl: _ }) => ty,
_ => panic!("Argument to pthread function was not a raw pointer"),
};
let target_layout = ecx.layout_of(target_ty)?;
assert!(target_layout.size.bytes() >= min_size);
Ok(())
}
// pthread_mutexattr_t is either 4 or 8 bytes, depending on the platform
// memory layout: store an i32 in the first four bytes equal to the
// corresponding libc mutex kind constant (i.e. PTHREAD_MUTEX_NORMAL)
fn mutexattr_get_kind<'mir, 'tcx: 'mir>(
ecx: &MiriEvalContext<'mir, 'tcx>,
attr_op: OpTy<'tcx, Tag>,
) -> InterpResult<'tcx, ScalarMaybeUndef<Tag>> {
// Ensure that the following read at an offset to the attr pointer is within bounds
assert_ptr_target_min_size(ecx, attr_op, 4)?;
let attr_place = ecx.deref_operand(attr_op)?;
let i32_layout = ecx.layout_of(ecx.tcx.types.i32)?;
let kind_place = attr_place.offset(Size::ZERO, MemPlaceMeta::None, i32_layout, ecx)?;
ecx.read_scalar(kind_place.into())
}
fn mutexattr_set_kind<'mir, 'tcx: 'mir>(
ecx: &mut MiriEvalContext<'mir, 'tcx>,
attr_op: OpTy<'tcx, Tag>,
kind: impl Into<ScalarMaybeUndef<Tag>>,
) -> InterpResult<'tcx, ()> {
// Ensure that the following write at an offset to the attr pointer is within bounds
assert_ptr_target_min_size(ecx, attr_op, 4)?;
let attr_place = ecx.deref_operand(attr_op)?;
let i32_layout = ecx.layout_of(ecx.tcx.types.i32)?;
let kind_place = attr_place.offset(Size::ZERO, MemPlaceMeta::None, i32_layout, ecx)?;
ecx.write_scalar(kind.into(), kind_place.into())
}
// pthread_mutex_t is between 24 and 48 bytes, depending on the platform
// memory layout:
// bytes 0-3: reserved for signature on macOS
// bytes 4-7: count of how many times this mutex has been locked, as a u32
// bytes 12-15: mutex kind, as an i32
// (the kind should be at this offset for compatibility with the static
// initializer macro)
fn mutex_get_locked_count<'mir, 'tcx: 'mir>(
ecx: &MiriEvalContext<'mir, 'tcx>,
mutex_op: OpTy<'tcx, Tag>,
) -> InterpResult<'tcx, ScalarMaybeUndef<Tag>> {
// Ensure that the following read at an offset to the mutex pointer is within bounds
assert_ptr_target_min_size(ecx, mutex_op, 16)?;
let mutex_place = ecx.deref_operand(mutex_op)?;
let u32_layout = ecx.layout_of(ecx.tcx.types.u32)?;
let locked_count_place =
mutex_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, ecx)?;
ecx.read_scalar(locked_count_place.into())
}
fn mutex_set_locked_count<'mir, 'tcx: 'mir>(
ecx: &mut MiriEvalContext<'mir, 'tcx>,
mutex_op: OpTy<'tcx, Tag>,
locked_count: impl Into<ScalarMaybeUndef<Tag>>,
) -> InterpResult<'tcx, ()> {
// Ensure that the following write at an offset to the mutex pointer is within bounds
assert_ptr_target_min_size(ecx, mutex_op, 16)?;
let mutex_place = ecx.deref_operand(mutex_op)?;
let u32_layout = ecx.layout_of(ecx.tcx.types.u32)?;
let locked_count_place =
mutex_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, ecx)?;
ecx.write_scalar(locked_count.into(), locked_count_place.into())
}
fn mutex_get_kind<'mir, 'tcx: 'mir>(
ecx: &MiriEvalContext<'mir, 'tcx>,
mutex_op: OpTy<'tcx, Tag>,
) -> InterpResult<'tcx, ScalarMaybeUndef<Tag>> {
// Ensure that the following read at an offset to the mutex pointer is within bounds
assert_ptr_target_min_size(ecx, mutex_op, 16)?;
let mutex_place = ecx.deref_operand(mutex_op)?;
let i32_layout = ecx.layout_of(ecx.tcx.types.i32)?;
let kind_place =
mutex_place.offset(Size::from_bytes(12), MemPlaceMeta::None, i32_layout, ecx)?;
ecx.read_scalar(kind_place.into())
}
fn mutex_set_kind<'mir, 'tcx: 'mir>(
ecx: &mut MiriEvalContext<'mir, 'tcx>,
mutex_op: OpTy<'tcx, Tag>,
kind: impl Into<ScalarMaybeUndef<Tag>>,
) -> InterpResult<'tcx, ()> {
// Ensure that the following write at an offset to the mutex pointer is within bounds
assert_ptr_target_min_size(ecx, mutex_op, 16)?;
let mutex_place = ecx.deref_operand(mutex_op)?;
let i32_layout = ecx.layout_of(ecx.tcx.types.i32)?;
let kind_place =
mutex_place.offset(Size::from_bytes(12), MemPlaceMeta::None, i32_layout, ecx)?;
ecx.write_scalar(kind.into(), kind_place.into())
}
// pthread_rwlock_t is between 32 and 56 bytes, depending on the platform
// memory layout:
// bytes 0-3: reserved for signature on macOS
// bytes 4-7: reader count, as a u32
// bytes 8-11: writer count, as a u32
fn rwlock_get_readers<'mir, 'tcx: 'mir>(
ecx: &MiriEvalContext<'mir, 'tcx>,
rwlock_op: OpTy<'tcx, Tag>,
) -> InterpResult<'tcx, ScalarMaybeUndef<Tag>> {
// Ensure that the following read at an offset to the rwlock pointer is within bounds
assert_ptr_target_min_size(ecx, rwlock_op, 12)?;
let rwlock_place = ecx.deref_operand(rwlock_op)?;
let u32_layout = ecx.layout_of(ecx.tcx.types.u32)?;
let readers_place =
rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, ecx)?;
ecx.read_scalar(readers_place.into())
}
fn rwlock_set_readers<'mir, 'tcx: 'mir>(
ecx: &mut MiriEvalContext<'mir, 'tcx>,
rwlock_op: OpTy<'tcx, Tag>,
readers: impl Into<ScalarMaybeUndef<Tag>>,
) -> InterpResult<'tcx, ()> {
// Ensure that the following write at an offset to the rwlock pointer is within bounds
assert_ptr_target_min_size(ecx, rwlock_op, 12)?;
let rwlock_place = ecx.deref_operand(rwlock_op)?;
let u32_layout = ecx.layout_of(ecx.tcx.types.u32)?;
let readers_place =
rwlock_place.offset(Size::from_bytes(4), MemPlaceMeta::None, u32_layout, ecx)?;
ecx.write_scalar(readers.into(), readers_place.into())
}
fn rwlock_get_writers<'mir, 'tcx: 'mir>(
ecx: &MiriEvalContext<'mir, 'tcx>,
rwlock_op: OpTy<'tcx, Tag>,
) -> InterpResult<'tcx, ScalarMaybeUndef<Tag>> {
// Ensure that the following read at an offset to the rwlock pointer is within bounds
assert_ptr_target_min_size(ecx, rwlock_op, 12)?;
let rwlock_place = ecx.deref_operand(rwlock_op)?;
let u32_layout = ecx.layout_of(ecx.tcx.types.u32)?;
let writers_place =
rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, ecx)?;
ecx.read_scalar(writers_place.into())
}
fn rwlock_set_writers<'mir, 'tcx: 'mir>(
ecx: &mut MiriEvalContext<'mir, 'tcx>,
rwlock_op: OpTy<'tcx, Tag>,
writers: impl Into<ScalarMaybeUndef<Tag>>,
) -> InterpResult<'tcx, ()> {
// Ensure that the following write at an offset to the rwlock pointer is within bounds
assert_ptr_target_min_size(ecx, rwlock_op, 12)?;
let rwlock_place = ecx.deref_operand(rwlock_op)?;
let u32_layout = ecx.layout_of(ecx.tcx.types.u32)?;
let writers_place =
rwlock_place.offset(Size::from_bytes(8), MemPlaceMeta::None, u32_layout, ecx)?;
ecx.write_scalar(writers.into(), writers_place.into())
}