incr.comp.: Acknowledge the fact that shift operations can panic at runtime.

Author: michaelwoerister

src/librustc/ich/hcx.rs

@@ -227,6 +227,8 @@ impl<'gcx> StableHashingContext<'gcx> {
         match binop {
             hir::BiAdd |
             hir::BiSub |
+            hir::BiShl |
+            hir::BiShr |
             hir::BiMul => self.overflow_checks_enabled,
 
             hir::BiDiv |
@@ -237,8 +239,6 @@ impl<'gcx> StableHashingContext<'gcx> {
             hir::BiBitXor |
             hir::BiBitAnd |
             hir::BiBitOr |
-            hir::BiShl |
-            hir::BiShr |
             hir::BiEq |
             hir::BiLt |
             hir::BiLe |

src/test/incremental/hashes/panic_exprs.rs

@@ -152,13 +152,48 @@ pub fn mod_by_zero(val: i32) -> i32 {
 }
 
 
+// shift left ------------------------------------------------------------------
+#[cfg(cfail1)]
+pub fn shift_left(val: i32, shift: usize) -> i32 {
+    val << shift
+}
+
+#[cfg(not(cfail1))]
+#[rustc_clean(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_dirty(label="HirBody", cfg="cfail2")]
+#[rustc_clean(label="HirBody", cfg="cfail3")]
+#[rustc_metadata_clean(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+pub fn shift_left(val: i32, shift: usize) -> i32 {
+    val << shift
+}
+
+
+// shift right ------------------------------------------------------------------
+#[cfg(cfail1)]
+pub fn shift_right(val: i32, shift: usize) -> i32 {
+    val >> shift
+}
+
+#[cfg(not(cfail1))]
+#[rustc_clean(label="Hir", cfg="cfail2")]
+#[rustc_clean(label="Hir", cfg="cfail3")]
+#[rustc_dirty(label="HirBody", cfg="cfail2")]
+#[rustc_clean(label="HirBody", cfg="cfail3")]
+#[rustc_metadata_clean(cfg="cfail2")]
+#[rustc_metadata_clean(cfg="cfail3")]
+pub fn shift_right(val: i32, shift: usize) -> i32 {
+    val >> shift
+}
+
 
 // THE FOLLOWING ITEMS SHOULD NOT BE INFLUENCED BY THEIR SOURCE LOCATION
 
 // bitwise ---------------------------------------------------------------------
 #[cfg(cfail1)]
 pub fn bitwise(val: i32) -> i32 {
-    !val & 0x101010101 | 0x45689 ^ 0x2372382 << 1 >> 1
+    !val & 0x101010101 | 0x45689 ^ 0x2372382
 }
 
 #[cfg(not(cfail1))]
@@ -169,7 +204,7 @@ pub fn bitwise(val: i32) -> i32 {
 #[rustc_metadata_clean(cfg="cfail2")]
 #[rustc_metadata_clean(cfg="cfail3")]
 pub fn bitwise(val: i32) -> i32 {
-    !val & 0x101010101 | 0x45689 ^ 0x2372382 << 1 >> 1
+    !val & 0x101010101 | 0x45689 ^ 0x2372382
 }