From 408c8eb983b2c460e56e1e71db26d6b7e76aa695 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Fri, 14 Jun 2024 12:14:32 +0200
Subject: [PATCH] add Miri tests

---
 .../miri/tests/fail/storage-live-dead-var.rs    | 14 ++++++++++++++
 .../tests/fail/storage-live-dead-var.stderr     | 15 +++++++++++++++
 .../miri/tests/fail/storage-live-resets-var.rs  | 17 +++++++++++++++++
 .../tests/fail/storage-live-resets-var.stderr   | 15 +++++++++++++++
 4 files changed, 61 insertions(+)
 create mode 100644 src/tools/miri/tests/fail/storage-live-dead-var.rs
 create mode 100644 src/tools/miri/tests/fail/storage-live-dead-var.stderr
 create mode 100644 src/tools/miri/tests/fail/storage-live-resets-var.rs
 create mode 100644 src/tools/miri/tests/fail/storage-live-resets-var.stderr

diff --git a/src/tools/miri/tests/fail/storage-live-dead-var.rs b/src/tools/miri/tests/fail/storage-live-dead-var.rs
new file mode 100644
index 0000000000000..83ab98d79d1a1
--- /dev/null
+++ b/src/tools/miri/tests/fail/storage-live-dead-var.rs
@@ -0,0 +1,14 @@
+#![feature(core_intrinsics, custom_mir)]
+use std::intrinsics::mir::*;
+
+#[custom_mir(dialect = "runtime")]
+fn main() {
+    mir! {
+        let val: i32;
+        {
+            val = 42; //~ERROR: accessing a dead local variable
+            StorageLive(val); // too late... (but needs to be here to make `val` not implicitly live)
+            Return()
+        }
+    }
+}
diff --git a/src/tools/miri/tests/fail/storage-live-dead-var.stderr b/src/tools/miri/tests/fail/storage-live-dead-var.stderr
new file mode 100644
index 0000000000000..ccc77b1c978dc
--- /dev/null
+++ b/src/tools/miri/tests/fail/storage-live-dead-var.stderr
@@ -0,0 +1,15 @@
+error: Undefined Behavior: accessing a dead local variable
+  --> $DIR/storage-live-dead-var.rs:LL:CC
+   |
+LL |             val = 42;
+   |             ^^^^^^^^ accessing a dead local variable
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at $DIR/storage-live-dead-var.rs:LL:CC
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+
diff --git a/src/tools/miri/tests/fail/storage-live-resets-var.rs b/src/tools/miri/tests/fail/storage-live-resets-var.rs
new file mode 100644
index 0000000000000..bfdd9e78943e9
--- /dev/null
+++ b/src/tools/miri/tests/fail/storage-live-resets-var.rs
@@ -0,0 +1,17 @@
+#![feature(core_intrinsics, custom_mir)]
+use std::intrinsics::mir::*;
+
+#[custom_mir(dialect = "runtime")]
+fn main() {
+    mir! {
+        let val: i32;
+        let _val2: i32;
+        {
+            StorageLive(val);
+            val = 42;
+            StorageLive(val); // reset val to `uninit`
+            _val2 = val; //~ERROR: uninitialized
+            Return()
+        }
+    }
+}
diff --git a/src/tools/miri/tests/fail/storage-live-resets-var.stderr b/src/tools/miri/tests/fail/storage-live-resets-var.stderr
new file mode 100644
index 0000000000000..07d39cc9d6b3f
--- /dev/null
+++ b/src/tools/miri/tests/fail/storage-live-resets-var.stderr
@@ -0,0 +1,15 @@
+error: Undefined Behavior: constructing invalid value: encountered uninitialized memory, but expected an integer
+  --> $DIR/storage-live-resets-var.rs:LL:CC
+   |
+LL |             _val2 = val;
+   |             ^^^^^^^^^^^ constructing invalid value: encountered uninitialized memory, but expected an integer
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at $DIR/storage-live-resets-var.rs:LL:CC
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+