Remove check_overflow method from MiscMethods

It can be retrieved from the Session too.

compiler/rustc_codegen_gcc/src/context.rs

@@ -27,7 +27,6 @@ use crate::callee::get_fn;
 use crate::common::SignType;
 
 pub struct CodegenCx<'gcc, 'tcx> {
-    pub check_overflow: bool,
     pub codegen_unit: &'tcx CodegenUnit<'tcx>,
     pub context: &'gcc Context<'gcc>,
 
@@ -134,8 +133,6 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         tcx: TyCtxt<'tcx>,
         supports_128bit_integers: bool,
     ) -> Self {
-        let check_overflow = tcx.sess.overflow_checks();
-
         let create_type = |ctype, rust_type| {
             let layout = tcx.layout_of(ParamEnv::reveal_all().and(rust_type)).unwrap();
             let align = layout.align.abi.bytes();
@@ -271,7 +268,6 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         }
 
         let mut cx = Self {
-            check_overflow,
             codegen_unit,
             context,
             current_func: RefCell::new(None),
@@ -511,10 +507,6 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         &self.tcx.sess
     }
 
-    fn check_overflow(&self) -> bool {
-        self.check_overflow
-    }
-
     fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
         self.codegen_unit
     }

compiler/rustc_codegen_llvm/src/context.rs

@@ -44,7 +44,6 @@ use std::str;
 /// All other LLVM data structures in the `CodegenCx` are tied to that `llvm::Context`.
 pub struct CodegenCx<'ll, 'tcx> {
     pub tcx: TyCtxt<'tcx>,
-    pub check_overflow: bool,
     pub use_dll_storage_attrs: bool,
     pub tls_model: llvm::ThreadLocalMode,
 
@@ -442,8 +441,6 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
         // start) and then strongly recommending static linkage on Windows!
         let use_dll_storage_attrs = tcx.sess.target.is_like_windows;
 
-        let check_overflow = tcx.sess.overflow_checks();
-
         let tls_model = to_llvm_tls_model(tcx.sess.tls_model());
 
         let (llcx, llmod) = (&*llvm_module.llcx, llvm_module.llmod());
@@ -467,7 +464,6 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
 
         CodegenCx {
             tcx,
-            check_overflow,
             use_dll_storage_attrs,
             tls_model,
             llmod,
@@ -606,10 +602,6 @@ impl<'ll, 'tcx> MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         self.tcx.sess
     }
 
-    fn check_overflow(&self) -> bool {
-        self.check_overflow
-    }
-
     fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
         self.codegen_unit
     }

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -658,7 +658,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         // with #[rustc_inherit_overflow_checks] and inlined from
         // another crate (mostly core::num generic/#[inline] fns),
         // while the current crate doesn't use overflow checks.
-        if !bx.cx().check_overflow() && msg.is_optional_overflow_check() {
+        if !bx.sess().overflow_checks() && msg.is_optional_overflow_check() {
             const_cond = Some(expected);
         }
 

compiler/rustc_codegen_ssa/src/traits/misc.rs

@@ -16,7 +16,6 @@ pub trait MiscMethods<'tcx>: BackendTypes {
         _vtable: Self::Value,
     ) {
     }
-    fn check_overflow(&self) -> bool;
     fn get_fn(&self, instance: Instance<'tcx>) -> Self::Function;
     fn get_fn_addr(&self, instance: Instance<'tcx>) -> Self::Value;
     fn eh_personality(&self) -> Self::Value;