1 files changed, 75 insertions, 0 deletions
diff --git a/compiler/rustc_mir_build/src/build/misc.rs b/compiler/rustc_mir_build/src/build/misc.rs
new file mode 100644
index 000000000..86f466ff7
--- /dev/null
+++ b/compiler/rustc_mir_build/src/build/misc.rs
@@ -0,0 +1,75 @@
+//! Miscellaneous builder routines that are not specific to building any particular
+//! kind of thing.
+
+use crate::build::Builder;
+
+use rustc_middle::mir::*;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::{Span, DUMMY_SP};
+use rustc_trait_selection::infer::InferCtxtExt;
+
+impl<'a, 'tcx> Builder<'a, 'tcx> {
+    /// Adds a new temporary value of type `ty` storing the result of
+    /// evaluating `expr`.
+    ///
+    /// N.B., **No cleanup is scheduled for this temporary.** You should
+    /// call `schedule_drop` once the temporary is initialized.
+    pub(crate) fn temp(&mut self, ty: Ty<'tcx>, span: Span) -> Place<'tcx> {
+        // Mark this local as internal to avoid temporaries with types not present in the
+        // user's code resulting in ICEs from the generator transform.
+        let temp = self.local_decls.push(LocalDecl::new(ty, span).internal());
+        let place = Place::from(temp);
+        debug!("temp: created temp {:?} with type {:?}", place, self.local_decls[temp].ty);
+        place
+    }
+
+    /// Convenience function for creating a literal operand, one
+    /// without any user type annotation.
+    pub(crate) fn literal_operand(
+        &mut self,
+        span: Span,
+        literal: ConstantKind<'tcx>,
+    ) -> Operand<'tcx> {
+        let constant = Box::new(Constant { span, user_ty: None, literal });
+        Operand::Constant(constant)
+    }
+
+    // Returns a zero literal operand for the appropriate type, works for
+    // bool, char and integers.
+    pub(crate) fn zero_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> {
+        let literal = ConstantKind::from_bits(self.tcx, 0, ty::ParamEnv::empty().and(ty));
+
+        self.literal_operand(span, literal)
+    }
+
+    pub(crate) fn push_usize(
+        &mut self,
+        block: BasicBlock,
+        source_info: SourceInfo,
+        value: u64,
+    ) -> Place<'tcx> {
+        let usize_ty = self.tcx.types.usize;
+        let temp = self.temp(usize_ty, source_info.span);
+        self.cfg.push_assign_constant(
+            block,
+            source_info,
+            temp,
+            Constant {
+                span: source_info.span,
+                user_ty: None,
+                literal: ConstantKind::from_usize(self.tcx, value),
+            },
+        );
+        temp
+    }
+
+    pub(crate) fn consume_by_copy_or_move(&self, place: Place<'tcx>) -> Operand<'tcx> {
+        let tcx = self.tcx;
+        let ty = place.ty(&self.local_decls, tcx).ty;
+        if !self.infcx.type_is_copy_modulo_regions(self.param_env, ty, DUMMY_SP) {
+            Operand::Move(place)
+        } else {
+            Operand::Copy(place)
+        }
+    }
+}