implement PlaceBuilder::try_ty

Author: b-naber

Cargo.lock

@@ -285,7 +285,7 @@ dependencies = [
 
 [[package]]
 name = "cargo"
-version = "0.68.0"
+version = "0.67.0"
 dependencies = [
  "anyhow",
  "atty",
@@ -307,7 +307,6 @@ dependencies = [
  "glob",
  "hex 0.4.2",
  "home",
- "http-auth",
  "humantime 2.0.1",
  "ignore",
  "im-rc",
@@ -350,11 +349,11 @@ dependencies = [
 
 [[package]]
 name = "cargo-credential"
-version = "0.2.0"
+version = "0.1.0"
 
 [[package]]
 name = "cargo-credential-1password"
-version = "0.2.0"
+version = "0.1.0"
 dependencies = [
  "cargo-credential",
  "serde",
@@ -363,15 +362,15 @@ dependencies = [
 
 [[package]]
 name = "cargo-credential-macos-keychain"
-version = "0.2.0"
+version = "0.1.0"
 dependencies = [
  "cargo-credential",
  "security-framework",
 ]
 
 [[package]]
 name = "cargo-credential-wincred"
-version = "0.2.0"
+version = "0.1.0"
 dependencies = [
  "cargo-credential",
  "winapi",
@@ -425,6 +424,7 @@ dependencies = [
  "glob",
  "itertools",
  "lazy_static",
+ "remove_dir_all",
  "serde_json",
  "snapbox",
  "tar",
@@ -436,7 +436,7 @@ dependencies = [
 
 [[package]]
 name = "cargo-util"
-version = "0.2.3"
+version = "0.2.2"
 dependencies = [
  "anyhow",
  "core-foundation",
@@ -446,7 +446,7 @@ dependencies = [
  "jobserver",
  "libc",
  "log",
- "miow 0.5.0",
+ "miow",
  "same-file",
  "shell-escape",
  "tempfile",
@@ -808,7 +808,7 @@ dependencies = [
  "lazy_static",
  "lazycell",
  "libc",
- "miow 0.3.7",
+ "miow",
  "miropt-test-tools",
  "regex",
  "rustfix",
@@ -833,7 +833,7 @@ dependencies = [
  "lazy_static",
  "libc",
  "log",
- "miow 0.3.7",
+ "miow",
  "regex",
  "rustfix",
  "serde",
@@ -846,9 +846,9 @@ dependencies = [
 
 [[package]]
 name = "concolor"
-version = "0.0.9"
+version = "0.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b90f9dcd9490a97db91a85ccd79e38a87e14323f0bb824659ee3274e9143ba37"
+checksum = "015267563b1df20adccdd00cb05257b1dfbea70a04928e9cf88ffb850c1a40af"
 dependencies = [
  "atty",
  "bitflags",
@@ -857,9 +857,9 @@ dependencies = [
 
 [[package]]
 name = "concolor-query"
-version = "0.1.0"
+version = "0.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82a90734b3d5dcf656e7624cca6bce9c3a90ee11f900e80141a7427ccfb3d317"
+checksum = "d6417fe6fc03a8b533fd2177742eeb39a90c7233eedec7bac96d4d6b69a09449"
 
 [[package]]
 name = "content_inspector"
@@ -909,7 +909,7 @@ dependencies = [
 
 [[package]]
 name = "crates-io"
-version = "0.35.0"
+version = "0.34.0"
 dependencies = [
  "anyhow",
  "curl",
@@ -1698,15 +1698,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "http-auth"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0b40b39d66c28829a0cf4d09f7e139ff8201f7500a5083732848ed3b4b4d850"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "humantime"
 version = "1.3.0"
@@ -2309,15 +2300,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "miow"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52ffbca2f655e33c08be35d87278e5b18b89550a37dbd598c20db92f6a471123"
-dependencies = [
- "windows-sys",
-]
-
 [[package]]
 name = "miri"
 version = "0.1.0"
@@ -4711,9 +4693,9 @@ checksum = "da73c8f77aebc0e40c300b93f0a5f1bece7a248a36eee287d4e095f35c7b7d6e"
 
 [[package]]
 name = "snapbox"
-version = "0.4.1"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "827c00e91b15e2674d8a5270bae91f898693cbf9561cbb58d8eaa31974597293"
+checksum = "44d199ccf8f606592df2d145db26f2aa45344e23c64b074cc5a4047f1d99b0f7"
 dependencies = [
  "concolor",
  "content_inspector",

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -323,6 +323,64 @@ impl<'tcx> PlaceBuilder<'tcx> {
             projection: Vec::from_iter(self.projection.iter().copied().chain([elem])),
         }
     }
+
+    pub fn try_ty<D>(&self, local_decls: &D, cx: &Builder<'_, 'tcx>) -> Option<Ty<'tcx>>
+    where
+        D: HasLocalDecls<'tcx>,
+    {
+        let tcx = cx.tcx;
+
+        let project_ty = |ty: Ty<'tcx>, elem: &PlaceElem<'tcx>| -> Ty<'tcx> {
+            match elem {
+                ProjectionElem::Deref => {
+                    ty.builtin_deref(true)
+                        .unwrap_or_else(|| {
+                            bug!("deref projection of non-dereferenceable ty {:?}", ty)
+                        })
+                        .ty
+                }
+                ProjectionElem::Index(_) | ProjectionElem::ConstantIndex { .. } => {
+                    ty.builtin_index().unwrap()
+                }
+                ProjectionElem::Subslice { from, to, from_end } => match ty.kind() {
+                    ty::Slice(..) => ty,
+                    ty::Array(inner, _) if !from_end => tcx.mk_array(*inner, (to - from) as u64),
+                    ty::Array(inner, size) if *from_end => {
+                        let size = size.eval_usize(tcx, ty::ParamEnv::empty());
+                        let len = size - (*from as u64) - (*to as u64);
+                        tcx.mk_array(*inner, len)
+                    }
+                    _ => bug!("cannot subslice non-array type: `{:?}`", ty),
+                },
+                ProjectionElem::Downcast(..) => ty,
+                ProjectionElem::Field(_, ty) | ProjectionElem::OpaqueCast(ty) => *ty,
+            }
+        };
+
+        match self.base {
+            PlaceBase::Local(local) => {
+                let base_ty = local_decls.local_decls()[local].ty;
+                Some(self.projection.iter().fold(base_ty, |ty, &elem| project_ty(ty, &elem)))
+            }
+            PlaceBase::Upvar { .. } => {
+                match to_upvars_resolved_place_builder(self.clone(), cx) {
+                    Ok(resolved_place_builder) => {
+                        // `base` is guaranteed to be `PlaceBase::Local` now, so recursive call is ok
+                        resolved_place_builder.try_ty(local_decls, cx)
+                    }
+                    Err(place_builder) => {
+                        match &place_builder.projection[..] {
+                            &[ProjectionElem::OpaqueCast(base_ty), ref projections @ ..] => Some(
+                                projections.iter().fold(base_ty, |ty, &elem| project_ty(ty, &elem)),
+                            ),
+
+                            _ => None, // would need a base `Ty` for these
+                        }
+                    }
+                }
+            }
+        }
+    }
 }
 
 impl<'tcx> From<Local> for PlaceBuilder<'tcx> {