ScalarInt: size mismatches are a bug, do not delay the panic

Author: RalfJung

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -110,7 +110,7 @@ pub(crate) fn codegen_const_value<'tcx>(
                 if fx.clif_type(layout.ty).is_some() {
                     return CValue::const_val(fx, layout, int);
                 } else {
-                    let raw_val = int.size().truncate(int.assert_bits(int.size()));
+                    let raw_val = int.size().truncate(int.to_bits(int.size()));
                     let val = match int.size().bytes() {
                         1 => fx.bcx.ins().iconst(types::I8, raw_val as i64),
                         2 => fx.bcx.ins().iconst(types::I16, raw_val as i64),
@@ -501,12 +501,12 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
                                             Ordering::Equal => scalar_int,
                                             Ordering::Less => match ty.kind() {
                                                 ty::Uint(_) => ScalarInt::try_from_uint(
-                                                    scalar_int.assert_uint(scalar_int.size()),
+                                                    scalar_int.to_uint(scalar_int.size()),
                                                     fx.layout_of(*ty).size,
                                                 )
                                                 .unwrap(),
                                                 ty::Int(_) => ScalarInt::try_from_int(
-                                                    scalar_int.assert_int(scalar_int.size()),
+                                                    scalar_int.to_int(scalar_int.size()),
                                                     fx.layout_of(*ty).size,
                                                 )
                                                 .unwrap(),

compiler/rustc_codegen_cranelift/src/intrinsics/llvm_x86.rs

@@ -902,7 +902,7 @@ pub(crate) fn codegen_x86_llvm_intrinsic_call<'tcx>(
                         .span_fatal(span, "Index argument for `_mm_cmpestri` is not a constant");
                 };
 
-            let imm8 = imm8.try_to_u8().unwrap_or_else(|_| panic!("kind not scalar: {:?}", imm8));
+            let imm8 = imm8.to_u8();
 
             codegen_inline_asm_inner(
                 fx,
@@ -955,7 +955,7 @@ pub(crate) fn codegen_x86_llvm_intrinsic_call<'tcx>(
                         .span_fatal(span, "Index argument for `_mm_cmpestrm` is not a constant");
                 };
 
-            let imm8 = imm8.try_to_u8().unwrap_or_else(|_| panic!("kind not scalar: {:?}", imm8));
+            let imm8 = imm8.to_u8();
 
             codegen_inline_asm_inner(
                 fx,
@@ -1003,7 +1003,7 @@ pub(crate) fn codegen_x86_llvm_intrinsic_call<'tcx>(
                     );
                 };
 
-            let imm8 = imm8.try_to_u8().unwrap_or_else(|_| panic!("kind not scalar: {:?}", imm8));
+            let imm8 = imm8.to_u8();
 
             codegen_inline_asm_inner(
                 fx,
@@ -1040,7 +1040,7 @@ pub(crate) fn codegen_x86_llvm_intrinsic_call<'tcx>(
                     );
                 };
 
-            let imm8 = imm8.try_to_u8().unwrap_or_else(|_| panic!("kind not scalar: {:?}", imm8));
+            let imm8 = imm8.to_u8();
 
             codegen_inline_asm_inner(
                 fx,
@@ -1195,7 +1195,7 @@ pub(crate) fn codegen_x86_llvm_intrinsic_call<'tcx>(
                     .span_fatal(span, "Func argument for `_mm_sha1rnds4_epu32` is not a constant");
             };
 
-            let func = func.try_to_u8().unwrap_or_else(|_| panic!("kind not scalar: {:?}", func));
+            let func = func.to_u8();
 
             codegen_inline_asm_inner(
                 fx,

compiler/rustc_codegen_cranelift/src/intrinsics/simd.rs

@@ -147,8 +147,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
 
             let total_len = lane_count * 2;
 
-            let indexes =
-                idx.iter().map(|idx| idx.unwrap_leaf().try_to_u32().unwrap()).collect::<Vec<u32>>();
+            let indexes = idx.iter().map(|idx| idx.unwrap_leaf().to_u32()).collect::<Vec<u32>>();
 
             for &idx in &indexes {
                 assert!(u64::from(idx) < total_len, "idx {} out of range 0..{}", idx, total_len);
@@ -282,9 +281,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                 fx.tcx.dcx().span_fatal(span, "Index argument for `simd_insert` is not a constant");
             };
 
-            let idx: u32 = idx_const
-                .try_to_u32()
-                .unwrap_or_else(|_| panic!("kind not scalar: {:?}", idx_const));
+            let idx: u32 = idx_const.to_u32();
             let (lane_count, _lane_ty) = base.layout().ty.simd_size_and_type(fx.tcx);
             if u64::from(idx) >= lane_count {
                 fx.tcx.dcx().span_fatal(
@@ -330,9 +327,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                 return;
             };
 
-            let idx = idx_const
-                .try_to_u32()
-                .unwrap_or_else(|_| panic!("kind not scalar: {:?}", idx_const));
+            let idx = idx_const.to_u32();
             let (lane_count, _lane_ty) = v.layout().ty.simd_size_and_type(fx.tcx);
             if u64::from(idx) >= lane_count {
                 fx.tcx.dcx().span_fatal(

compiler/rustc_codegen_cranelift/src/value_and_place.rs

@@ -327,7 +327,7 @@ impl<'tcx> CValue<'tcx> {
 
         let val = match layout.ty.kind() {
             ty::Uint(UintTy::U128) | ty::Int(IntTy::I128) => {
-                let const_val = const_val.assert_bits(layout.size);
+                let const_val = const_val.to_bits(layout.size);
                 let lsb = fx.bcx.ins().iconst(types::I64, const_val as u64 as i64);
                 let msb = fx.bcx.ins().iconst(types::I64, (const_val >> 64) as u64 as i64);
                 fx.bcx.ins().iconcat(lsb, msb)
@@ -339,7 +339,7 @@ impl<'tcx> CValue<'tcx> {
             | ty::Ref(..)
             | ty::RawPtr(..)
             | ty::FnPtr(..) => {
-                let raw_val = const_val.size().truncate(const_val.assert_bits(layout.size));
+                let raw_val = const_val.size().truncate(const_val.to_bits(layout.size));
                 fx.bcx.ins().iconst(clif_ty, raw_val as i64)
             }
             ty::Float(FloatTy::F32) => {

compiler/rustc_codegen_gcc/src/common.rs

@@ -166,7 +166,7 @@ impl<'gcc, 'tcx> ConstMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         let bitsize = if layout.is_bool() { 1 } else { layout.size(self).bits() };
         match cv {
             Scalar::Int(int) => {
-                let data = int.assert_bits(layout.size(self));
+                let data = int.to_bits(layout.size(self));
 
                 // FIXME(antoyo): there's some issues with using the u128 code that follows, so hard-code
                 // the paths for floating-point values.

compiler/rustc_codegen_llvm/src/common.rs

@@ -244,7 +244,7 @@ impl<'ll, 'tcx> ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         let bitsize = if layout.is_bool() { 1 } else { layout.size(self).bits() };
         match cv {
             Scalar::Int(int) => {
-                let data = int.assert_bits(layout.size(self));
+                let data = int.to_bits(layout.size(self));
                 let llval = self.const_uint_big(self.type_ix(bitsize), data);
                 if matches!(layout.primitive(), Pointer(_)) {
                     unsafe { llvm::LLVMConstIntToPtr(llval, llty) }

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -1221,7 +1221,7 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
             .iter()
             .enumerate()
             .map(|(arg_idx, val)| {
-                let idx = val.unwrap_leaf().try_to_i32().unwrap();
+                let idx = val.unwrap_leaf().to_i32();
                 if idx >= i32::try_from(total_len).unwrap() {
                     bx.sess().dcx().emit_err(InvalidMonomorphization::SimdIndexOutOfBounds {
                         span,

compiler/rustc_codegen_ssa/src/common.rs

@@ -163,7 +163,7 @@ pub fn asm_const_to_str<'tcx>(
     let mir::ConstValue::Scalar(scalar) = const_value else {
         span_bug!(sp, "expected Scalar for promoted asm const, but got {:#?}", const_value)
     };
-    let value = scalar.assert_bits(ty_and_layout.size);
+    let value = scalar.assert_scalar_int().to_bits(ty_and_layout.size);
     match ty_and_layout.ty.kind() {
         ty::Uint(_) => value.to_string(),
         ty::Int(int_ty) => match int_ty.normalize(tcx.sess.target.pointer_width) {

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -549,7 +549,7 @@ impl<'tcx> interpret::Machine<'tcx> for CompileTimeInterpreter<'tcx> {
         use rustc_middle::mir::AssertKind::*;
         // Convert `AssertKind<Operand>` to `AssertKind<Scalar>`.
         let eval_to_int =
-            |op| ecx.read_immediate(&ecx.eval_operand(op, None)?).map(|x| x.to_const_int());
+            |op| ecx.read_immediate(&ecx.eval_operand(op, None)?).and_then(|x| x.to_const_int());
         let err = match msg {
             BoundsCheck { len, index } => {
                 let len = eval_to_int(len)?;

compiler/rustc_const_eval/src/const_eval/valtrees.rs

@@ -95,10 +95,10 @@ fn const_to_valtree_inner<'tcx>(
         }
         ty::Bool | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Char => {
             let val = ecx.read_immediate(place)?;
-            let val = val.to_scalar();
+            let val = val.to_scalar_int().unwrap();
             *num_nodes += 1;
 
-            Ok(ty::ValTree::Leaf(val.assert_int()))
+            Ok(ty::ValTree::Leaf(val))
         }
 
         ty::Pat(base, ..) => {
@@ -125,7 +125,7 @@ fn const_to_valtree_inner<'tcx>(
             let val = val.to_scalar();
             // We are in the CTFE machine, so ptr-to-int casts will fail.
             // This can only be `Ok` if `val` already is an integer.
-            let Ok(val) = val.try_to_int() else {
+            let Ok(val) = val.try_to_scalar_int() else {
                 return Err(ValTreeCreationError::NonSupportedType);
             };
             // It's just a ScalarInt!
@@ -411,7 +411,7 @@ fn valtree_into_mplace<'tcx>(
                 ty::Adt(def, _) if def.is_enum() => {
                     // First element of valtree corresponds to variant
                     let scalar_int = branches[0].unwrap_leaf();
-                    let variant_idx = VariantIdx::from_u32(scalar_int.try_to_u32().unwrap());
+                    let variant_idx = VariantIdx::from_u32(scalar_int.to_u32());
                     let variant = def.variant(variant_idx);
                     debug!(?variant);