Rollup merge of #69954 - RalfJung:panic_if-assert, r=Centril,eddyb

rename panic_if_ intrinsics to assert_

[Suggested by @eddyb](https://github.com/rust-lang/miri/issues/1222#issuecomment-598087523)

src/libcore/intrinsics.rs

@@ -1005,17 +1005,23 @@ extern "rust-intrinsic" {
 
     /// A guard for unsafe functions that cannot ever be executed if `T` is uninhabited:
     /// This will statically either panic, or do nothing.
+    #[cfg(bootstrap)]
     pub fn panic_if_uninhabited<T>();
 
+    /// A guard for unsafe functions that cannot ever be executed if `T` is uninhabited:
+    /// This will statically either panic, or do nothing.
+    #[cfg(not(bootstrap))]
+    pub fn assert_inhabited<T>();
+
     /// A guard for unsafe functions that cannot ever be executed if `T` does not permit
     /// zero-initialization: This will statically either panic, or do nothing.
     #[cfg(not(bootstrap))]
-    pub fn panic_if_zero_invalid<T>();
+    pub fn assert_zero_valid<T>();
 
     /// A guard for unsafe functions that cannot ever be executed if `T` has invalid
     /// bit patterns: This will statically either panic, or do nothing.
     #[cfg(not(bootstrap))]
-    pub fn panic_if_any_invalid<T>();
+    pub fn assert_uninit_valid<T>();
 
     /// Gets a reference to a static `Location` indicating where it was called.
     #[rustc_const_unstable(feature = "const_caller_location", issue = "47809")]

src/libcore/mem/maybe_uninit.rs

@@ -495,7 +495,10 @@ impl<T> MaybeUninit<T> {
     #[inline(always)]
     #[rustc_diagnostic_item = "assume_init"]
     pub unsafe fn assume_init(self) -> T {
+        #[cfg(bootstrap)]
         intrinsics::panic_if_uninhabited::<T>();
+        #[cfg(not(bootstrap))]
+        intrinsics::assert_inhabited::<T>();
         ManuallyDrop::into_inner(self.value)
     }
 
@@ -559,7 +562,10 @@ impl<T> MaybeUninit<T> {
     #[unstable(feature = "maybe_uninit_extra", issue = "63567")]
     #[inline(always)]
     pub unsafe fn read(&self) -> T {
+        #[cfg(bootstrap)]
         intrinsics::panic_if_uninhabited::<T>();
+        #[cfg(not(bootstrap))]
+        intrinsics::assert_inhabited::<T>();
         self.as_ptr().read()
     }
 
@@ -621,7 +627,10 @@ impl<T> MaybeUninit<T> {
     #[unstable(feature = "maybe_uninit_ref", issue = "63568")]
     #[inline(always)]
     pub unsafe fn get_ref(&self) -> &T {
+        #[cfg(bootstrap)]
         intrinsics::panic_if_uninhabited::<T>();
+        #[cfg(not(bootstrap))]
+        intrinsics::assert_inhabited::<T>();
         &*self.value
     }
 
@@ -739,7 +748,10 @@ impl<T> MaybeUninit<T> {
     #[unstable(feature = "maybe_uninit_ref", issue = "63568")]
     #[inline(always)]
     pub unsafe fn get_mut(&mut self) -> &mut T {
+        #[cfg(bootstrap)]
         intrinsics::panic_if_uninhabited::<T>();
+        #[cfg(not(bootstrap))]
+        intrinsics::assert_inhabited::<T>();
         &mut *self.value
     }
 

src/libcore/mem/mod.rs

@@ -497,7 +497,7 @@ pub const fn needs_drop<T>() -> bool {
 #[rustc_diagnostic_item = "mem_zeroed"]
 pub unsafe fn zeroed<T>() -> T {
     #[cfg(not(bootstrap))]
-    intrinsics::panic_if_zero_invalid::<T>();
+    intrinsics::assert_zero_valid::<T>();
     #[cfg(bootstrap)]
     intrinsics::panic_if_uninhabited::<T>();
     intrinsics::init()
@@ -533,7 +533,7 @@ pub unsafe fn zeroed<T>() -> T {
 #[rustc_diagnostic_item = "mem_uninitialized"]
 pub unsafe fn uninitialized<T>() -> T {
     #[cfg(not(bootstrap))]
-    intrinsics::panic_if_any_invalid::<T>();
+    intrinsics::assert_uninit_valid::<T>();
     #[cfg(bootstrap)]
     intrinsics::panic_if_uninhabited::<T>();
     intrinsics::uninit()

src/librustc_codegen_ssa/mir/block.rs

@@ -449,38 +449,38 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         destination: &Option<(mir::Place<'tcx>, mir::BasicBlock)>,
         cleanup: Option<mir::BasicBlock>,
     ) -> bool {
-        // Emit a panic or a no-op for `panic_if_uninhabited`.
+        // Emit a panic or a no-op for `assert_*` intrinsics.
         // These are intrinsics that compile to panics so that we can get a message
         // which mentions the offending type, even from a const context.
         #[derive(Debug, PartialEq)]
-        enum PanicIntrinsic {
-            IfUninhabited,
-            IfZeroInvalid,
-            IfAnyInvalid,
+        enum AssertIntrinsic {
+            Inhabited,
+            ZeroValid,
+            UninitValid,
         };
         let panic_intrinsic = intrinsic.and_then(|i| match i {
             // FIXME: Move to symbols instead of strings.
-            "panic_if_uninhabited" => Some(PanicIntrinsic::IfUninhabited),
-            "panic_if_zero_invalid" => Some(PanicIntrinsic::IfZeroInvalid),
-            "panic_if_any_invalid" => Some(PanicIntrinsic::IfAnyInvalid),
+            "assert_inhabited" => Some(AssertIntrinsic::Inhabited),
+            "assert_zero_valid" => Some(AssertIntrinsic::ZeroValid),
+            "assert_uninit_valid" => Some(AssertIntrinsic::UninitValid),
             _ => None,
         });
         if let Some(intrinsic) = panic_intrinsic {
-            use PanicIntrinsic::*;
+            use AssertIntrinsic::*;
             let ty = instance.unwrap().substs.type_at(0);
             let layout = bx.layout_of(ty);
             let do_panic = match intrinsic {
-                IfUninhabited => layout.abi.is_uninhabited(),
+                Inhabited => layout.abi.is_uninhabited(),
                 // We unwrap as the error type is `!`.
-                IfZeroInvalid => !layout.might_permit_raw_init(bx, /*zero:*/ true).unwrap(),
+                ZeroValid => !layout.might_permit_raw_init(bx, /*zero:*/ true).unwrap(),
                 // We unwrap as the error type is `!`.
-                IfAnyInvalid => !layout.might_permit_raw_init(bx, /*zero:*/ false).unwrap(),
+                UninitValid => !layout.might_permit_raw_init(bx, /*zero:*/ false).unwrap(),
             };
             if do_panic {
                 let msg_str = if layout.abi.is_uninhabited() {
                     // Use this error even for the other intrinsics as it is more precise.
                     format!("attempted to instantiate uninhabited type `{}`", ty)
-                } else if intrinsic == IfZeroInvalid {
+                } else if intrinsic == ZeroValid {
                     format!("attempted to zero-initialize type `{}`, which is invalid", ty)
                 } else {
                     format!("attempted to leave type `{}` uninitialized, which is invalid", ty)

src/librustc_typeck/check/intrinsic.rs

@@ -147,7 +147,7 @@ pub fn check_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
             ),
             "rustc_peek" => (1, vec![param(0)], param(0)),
             "caller_location" => (0, vec![], tcx.caller_location_ty()),
-            "panic_if_uninhabited" | "panic_if_zero_invalid" | "panic_if_any_invalid" => {
+            "assert_inhabited" | "assert_zero_valid" | "assert_uninit_valid" => {
                 (1, Vec::new(), tcx.mk_unit())
             }
             "init" => (1, Vec::new(), param(0)),