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don't always allocate during init intrinsic processing

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This commit is contained in:
Oliver Schneider 2016-11-03 12:31:04 +01:00
parent b3bf730513
commit bf73e7581e
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GPG key ID: 56D6EEA0FC67AC46
1 changed files with 48 additions and 5 deletions
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53
src/interpreter/terminator/intrinsics.rs
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@ -6,7 +6,7 @@ use rustc::ty::{self, Ty};
use error::{EvalError, EvalResult};
use interpreter::value::Value;
use interpreter::{EvalContext, Lvalue};
use interpreter::{EvalContext, Lvalue, LvalueExtra};
use primval::{self, PrimVal, PrimValKind};
impl<'a, 'tcx> EvalContext<'a, 'tcx> {
@ -126,11 +126,54 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
"forget" => {}
"init" => {
// FIXME(solson)
let dest = self.force_allocation(dest)?.to_ptr();
let size = dest_layout.size(&self.tcx.data_layout).bytes() as usize;
self.memory.write_repeat(dest, 0, size)?;
match dest {
Lvalue::Local { frame, local } => {
match self.stack[frame].get_local(local) {
Some(Value::ByRef(ptr)) => self.memory.write_repeat(ptr, 0, size)?,
None => match self.ty_to_primval_kind(dest_ty) {
Ok(kind) => self.stack[frame].set_local(local, Value::ByVal(PrimVal::new(0, kind))),
Err(_) => {
let ptr = self.alloc_ptr_with_substs(dest_ty, substs)?;
self.memory.write_repeat(ptr, 0, size)?;
self.stack[frame].set_local(local, Value::ByRef(ptr));
}
},
Some(Value::ByVal(val)) => self.stack[frame].set_local(local, Value::ByVal(PrimVal::new(0, val.kind))),
Some(Value::ByValPair(a, b)) => self.stack[frame].set_local(local, Value::ByValPair(
PrimVal::new(0, a.kind),
PrimVal::new(0, b.kind),
)),
}
}
Lvalue::Ptr { ptr, extra: LvalueExtra::None } => self.memory.write_repeat(ptr, 0, size)?,
Lvalue::Ptr { .. } => bug!("init intrinsic tried to write to fat ptr target"),
Lvalue::Global(cid) => {
let global_val = *self.globals.get(&cid).expect("global not cached");
if !global_val.mutable {
return Err(EvalError::ModifiedConstantMemory);
}
match global_val.data {
Some(Value::ByRef(ptr)) => self.memory.write_repeat(ptr, 0, size)?,
None => match self.ty_to_primval_kind(dest_ty) {
Ok(kind) => self.globals
.get_mut(&cid)
.expect("already checked")
.data = Some(Value::ByVal(PrimVal::new(0, kind))),
Err(_) => {
let ptr = self.alloc_ptr_with_substs(dest_ty, substs)?;
self.memory.write_repeat(ptr, 0, size)?;
self.globals.get_mut(&cid).expect("already checked").data = Some(Value::ByRef(ptr));
},
},
Some(Value::ByVal(val)) => self.globals.get_mut(&cid).expect("already checked").data = Some(Value::ByVal(PrimVal::new(0, val.kind))),
Some(Value::ByValPair(a, b)) => self.globals.get_mut(&cid).expect("already checked").data = Some(Value::ByValPair(
PrimVal::new(0, a.kind),
PrimVal::new(0, b.kind),
)),
}
}
}
}
"min_align_of" => {