From fd352b02e17d78f03345ebc3ffabe02b0cb04fd1 Mon Sep 17 00:00:00 2001
From: Saleem Jaffer <ssaleem1992@gmail.com>
Date: Sat, 20 Jul 2019 11:48:16 +0530
Subject: [PATCH] alters the panic variant of InterpError

---
 src/librustc/mir/interpret/error.rs      | 59 +++++++++---------------
 src/librustc/mir/interpret/mod.rs        |  2 +-
 src/librustc_mir/interpret/intrinsics.rs |  6 +--
 3 files changed, 25 insertions(+), 42 deletions(-)

diff --git a/src/librustc/mir/interpret/error.rs b/src/librustc/mir/interpret/error.rs
index d5caa3c8ce4..9e216a14874 100644
--- a/src/librustc/mir/interpret/error.rs
+++ b/src/librustc/mir/interpret/error.rs
@@ -228,6 +228,24 @@ impl<'tcx> From<InterpError<'tcx, u64>> for InterpErrorInfo<'tcx> {
 
 pub type AssertMessage<'tcx> = InterpError<'tcx, mir::Operand<'tcx>>;
 
+#[derive(Clone, RustcEncodable, RustcDecodable, HashStable)]
+pub enum EvalErrorPanic<O> {
+    Panic {
+        msg: Symbol,
+        line: u32,
+        col: u32,
+        file: Symbol,
+    },
+    BoundsCheck {
+        len: O,
+        index: O,
+    },
+    Overflow(mir::BinOp),
+    OverflowNeg,
+    DivisionByZero,
+    RemainderByZero,
+}
+
 #[derive(Clone, RustcEncodable, RustcDecodable, HashStable)]
 pub enum InterpError<'tcx, O> {
     /// This variant is used by machines to signal their own errors that do not
@@ -247,7 +265,6 @@ pub enum InterpError<'tcx, O> {
     DanglingPointerDeref,
     DoubleFree,
     InvalidMemoryAccess,
-    FunctionPointerTyMismatch(FnSig<'tcx>, FnSig<'tcx>),
     InvalidFunctionPointer,
     InvalidBool,
     InvalidDiscriminant(ScalarMaybeUndef),
@@ -267,13 +284,11 @@ pub enum InterpError<'tcx, O> {
     Unimplemented(String),
     DerefFunctionPointer,
     ExecuteMemory,
-    // asd
     BoundsCheck { len: O, index: O },
     Overflow(mir::BinOp),
     OverflowNeg,
     DivisionByZero,
     RemainderByZero,
-    // asd
     Intrinsic(String),
     InvalidChar(u128),
     StackFrameLimitReached,
@@ -284,29 +299,6 @@ pub enum InterpError<'tcx, O> {
         required: Align,
         has: Align,
     },
-    MemoryLockViolation {
-        ptr: Pointer,
-        len: u64,
-        frame: usize,
-        access: AccessKind,
-        lock: Lock,
-    },
-    MemoryAcquireConflict {
-        ptr: Pointer,
-        len: u64,
-        kind: AccessKind,
-        lock: Lock,
-    },
-    InvalidMemoryLockRelease {
-        ptr: Pointer,
-        len: u64,
-        frame: usize,
-        lock: Lock,
-    },
-    DeallocatedLockedMemory {
-        ptr: Pointer,
-        lock: Lock,
-    },
     ValidationFailure(String),
     CalledClosureAsFunction,
     VtableForArgumentlessMethod,
@@ -324,7 +316,7 @@ pub enum InterpError<'tcx, O> {
     HeapAllocZeroBytes,
     HeapAllocNonPowerOfTwoAlignment(u64),
     Unreachable,
-    Panic(EvalErrorPanic<'tcx, O>),
+    Panic(EvalErrorPanic<O>),
     ReadFromReturnPointer,
     PathNotFound(Vec<String>),
     UnimplementedTraitSelection,
@@ -340,15 +332,6 @@ pub enum InterpError<'tcx, O> {
     InfiniteLoop,
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable)]
-pub enum EvalErrorPanic<'tcx, O> {
-    Panic,
-    BoundsCheck { len: O, index: O },
-    Overflow(mir::BinOp),
-    OverflowNeg,
-    DivisionByZero,
-    RemainderByZero,
-}
 
 pub type InterpResult<'tcx, T = ()> = Result<T, InterpErrorInfo<'tcx>>;
 
@@ -549,8 +532,8 @@ impl<'tcx, O: fmt::Debug> fmt::Debug for InterpError<'tcx, O> {
                 write!(f, "incorrect alloc info: expected size {} and align {}, \
                            got size {} and align {}",
                     size.bytes(), align.bytes(), size2.bytes(), align2.bytes()),
-            Panic { ref msg, line, col, ref file } =>
-                write!(f, "the evaluated program panicked at '{}', {}:{}:{}", msg, file, line, col),
+            Panic { .. } =>
+                write!(f, "the evaluated program panicked"),
             InvalidDiscriminant(val) =>
                 write!(f, "encountered invalid enum discriminant {}", val),
             Exit(code) =>
diff --git a/src/librustc/mir/interpret/mod.rs b/src/librustc/mir/interpret/mod.rs
index 1b294250aa3..01bc27d55e5 100644
--- a/src/librustc/mir/interpret/mod.rs
+++ b/src/librustc/mir/interpret/mod.rs
@@ -12,7 +12,7 @@ mod pointer;
 
 pub use self::error::{
     InterpErrorInfo, InterpResult, InterpError, AssertMessage, ConstEvalErr, struct_error,
-    FrameInfo, ConstEvalRawResult, ConstEvalResult, ErrorHandled,
+    FrameInfo, ConstEvalRawResult, ConstEvalResult, ErrorHandled, EvalErrorPanic
 };
 
 pub use self::value::{Scalar, ScalarMaybeUndef, RawConst, ConstValue};
diff --git a/src/librustc_mir/interpret/intrinsics.rs b/src/librustc_mir/interpret/intrinsics.rs
index cf36c10a614..5b80d0e251e 100644
--- a/src/librustc_mir/interpret/intrinsics.rs
+++ b/src/librustc_mir/interpret/intrinsics.rs
@@ -7,7 +7,7 @@ use rustc::ty;
 use rustc::ty::layout::{LayoutOf, Primitive, Size};
 use rustc::mir::BinOp;
 use rustc::mir::interpret::{
-    InterpResult, InterpError, Scalar,
+    InterpResult, InterpError, Scalar, EvalErrorPanic,
 };
 
 use super::{
@@ -261,7 +261,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             let file = Symbol::intern(self.read_str(file_place)?);
             let line = self.read_scalar(line.into())?.to_u32()?;
             let col = self.read_scalar(col.into())?.to_u32()?;
-            return Err(InterpError::Panic { msg, file, line, col }.into());
+            return Err(InterpError::Panic(EvalErrorPanic::Panic { msg, file, line, col }).into());
         } else if Some(def_id) == self.tcx.lang_items().begin_panic_fn() {
             assert!(args.len() == 2);
             // &'static str, &(&'static str, u32, u32)
@@ -279,7 +279,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             let file = Symbol::intern(self.read_str(file_place)?);
             let line = self.read_scalar(line.into())?.to_u32()?;
             let col = self.read_scalar(col.into())?.to_u32()?;
-            return Err(InterpError::Panic { msg, file, line, col }.into());
+            return Err(InterpError::Panic(EvalErrorPanic::Panic { msg, file, line, col }).into());
         } else {
             return Ok(false);
         }