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diff --git a/src/ir/abstract.h b/src/ir/abstract.h
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+/*
+ * Copyright 2018 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Abstracts out operations from specific opcodes.
+
+#ifndef wasm_ir_abstract_h
+#define wasm_ir_abstract_h
+
+#include <wasm.h>
+
+namespace wasm {
+
+namespace Abstract {
+
+enum Op {
+  // Unary
+  Neg,
+  // Binary
+  Add, Sub, Mul, DivU, DivS, Rem, RemU, RemS,
+  Shl, ShrU, ShrS,
+  And, Or, Xor,
+  // Relational
+  Eq, Ne,
+};
+
+// Provide a wasm type and an abstract op and get the concrete one. For example, you can
+// provide i32 and Add and receive the specific opcode for a 32-bit addition,
+// AddInt32.
+// If the op does not exist, it returns Invalid.
+inline UnaryOp getUnary(Type type, Op op) {
+  switch (type) {
+    case i32: {
+      switch (op) {
+        default: return InvalidUnary;
+      }
+      break;
+    }
+    case i64: {
+      switch (op) {
+        default: return InvalidUnary;
+      }
+      break;
+    }
+    case f32: {
+      switch (op) {
+        case Neg: return NegFloat32;
+        default:  return InvalidUnary;
+      }
+      break;
+    }
+    case f64: {
+      switch (op) {
+        case Neg: return NegFloat64;
+        default:  return InvalidUnary;
+      }
+      break;
+    }
+    default: return InvalidUnary;
+  }
+  WASM_UNREACHABLE();
+}
+
+inline BinaryOp getBinary(Type type, Op op) {
+  switch (type) {
+    case i32: {
+      switch (op) {
+        case Add:  return AddInt32;
+        case Sub:  return SubInt32;
+        case Mul:  return MulInt32;
+        case DivU: return DivUInt32;
+        case DivS: return DivSInt32;
+        case RemU: return RemUInt32;
+        case RemS: return RemSInt32;
+        case Shl:  return ShlInt32;
+        case ShrU: return ShrUInt32;
+        case ShrS: return ShrSInt32;
+        case And:  return AndInt32;
+        case Or:   return OrInt32;
+        case Xor:  return XorInt32;
+        case Eq:   return EqInt32;
+        case Ne:   return NeInt32;
+        default:   return InvalidBinary;
+      }
+      break;
+    }
+    case i64: {
+      switch (op) {
+        case Add:  return AddInt64;
+        case Sub:  return SubInt64;
+        case Mul:  return MulInt64;
+        case DivU: return DivUInt64;
+        case DivS: return DivSInt64;
+        case RemU: return RemUInt64;
+        case RemS: return RemSInt64;
+        case Shl:  return ShlInt64;
+        case ShrU: return ShrUInt64;
+        case ShrS: return ShrSInt64;
+        case And:  return AndInt64;
+        case Or:   return OrInt64;
+        case Xor:  return XorInt64;
+        case Eq:   return EqInt64;
+        case Ne:   return NeInt64;
+        default:   return InvalidBinary;
+      }
+      break;
+    }
+    case f32: {
+      switch (op) {
+        case Add:  return AddFloat32;
+        case Sub:  return SubFloat32;
+        case Mul:  return MulFloat32;
+        case DivU: return DivFloat32;
+        case DivS: return DivFloat32;
+        case Eq:   return EqFloat32;
+        case Ne:   return NeFloat32;
+        default:   return InvalidBinary;
+      }
+      break;
+    }
+    case f64: {
+      switch (op) {
+        case Add:  return AddFloat64;
+        case Sub:  return SubFloat64;
+        case Mul:  return MulFloat64;
+        case DivU: return DivFloat64;
+        case DivS: return DivFloat64;
+        case Eq:   return EqFloat64;
+        case Ne:   return NeFloat64;
+        default:   return InvalidBinary;
+      }
+      break;
+    }
+    default: return InvalidBinary;
+  }
+  WASM_UNREACHABLE();
+}
+
+} // namespace Abstract
+
+} // namespace wasm
+
+#endif // wasm_ir_abstract_h
+