diff --git a/Cargo.lock b/Cargo.lock
index 9647324..c2a6ea3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,7 +2,7 @@
 # It is not intended for manual editing.
 [[package]]
 name = "arrayref"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -15,14 +15,18 @@ name = "autocfg"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "autocfg"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "bincode"
-version = "1.2.0"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -32,12 +36,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "blake2b_simd"
-version = "0.5.9"
+version = "0.5.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "arrayref 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "constant_time_eq 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -47,7 +51,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.47"
+version = "1.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -68,12 +72,12 @@ name = "cmake"
 version = "0.1.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "constant_time_eq"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -153,19 +157,11 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-queue"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.6.6"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -197,7 +193,7 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "errno-dragonfly 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -207,7 +203,7 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -223,9 +219,9 @@ name = "failure_derive"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -244,10 +240,10 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.3"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -257,27 +253,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "indexmap"
-version = "1.3.0"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "itoa"
-version = "0.4.4"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "kernel32-sys"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -285,12 +272,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.65"
+version = "0.2.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lock_api"
-version = "0.3.1"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -314,7 +301,7 @@ name = "memmap"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -332,29 +319,28 @@ version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "num_cpus"
-version = "1.11.1"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hermit-abi 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "page_size"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -362,7 +348,7 @@ name = "parking_lot"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lock_api 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lock_api 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot_core 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -374,7 +360,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -383,7 +369,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.6"
+version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -394,7 +380,7 @@ name = "quote"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -403,30 +389,30 @@ version = "6.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rayon"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-deque 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "rayon-core 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon-core 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rayon-core"
-version = "1.6.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-deque 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-queue 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-queue 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -440,8 +426,8 @@ version = "0.3.0"
 dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rutie 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmer-runtime 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmer-runtime-core 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmer-runtime 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmer-runtime-core 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -458,7 +444,7 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -486,7 +472,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.102"
+version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -495,35 +481,35 @@ version = "0.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_bytes"
-version = "0.11.2"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.102"
+version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.41"
+version = "1.0.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -536,10 +522,10 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.8"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -549,9 +535,9 @@ name = "synstructure"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -562,7 +548,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -582,26 +568,26 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "wasmer-clif-backend"
-version = "0.10.1"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "cranelift-codegen 0.44.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cranelift-entity 0.44.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cranelift-native 0.44.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rayon 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde-bench 0.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_bytes 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_bytes 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "target-lexicon 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-clif-fork-frontend 0.44.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-clif-fork-wasm 0.44.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmer-runtime-core 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmer-win-exception-handler 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmparser 0.39.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmer-runtime-core 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmer-win-exception-handler 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmparser 0.39.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -627,66 +613,61 @@ dependencies = [
  "failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-clif-fork-frontend 0.44.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasmparser 0.39.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmparser 0.39.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wasmer-runtime"
-version = "0.10.1"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
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diff --git a/src/instance.rs b/src/instance/exports.rs
similarity index 68%
rename from src/instance.rs
rename to src/instance/exports.rs
index ee0d66f..afc454d 100644
--- a/src/instance.rs
+++ b/src/instance/exports.rs
@@ -1,20 +1,17 @@
-//! The `Instance` WebAssembly class.
+//! The `ExportedFunctions` WebAssembly class.
 
-use crate::{
-    error::unwrap_or_raise,
-    memory::{Memory, RubyMemory, MEMORY_WRAPPER},
-};
+use crate::error::unwrap_or_raise;
 use lazy_static::lazy_static;
 use rutie::{
     class, methods,
     rubysys::{class, value::ValueType},
     types::{Argc, Value},
     util::str_to_cstring,
-    wrappable_struct, AnyException, AnyObject, Array, Boolean, Exception, Fixnum, Float, Module,
-    NilClass, Object, RString, Symbol,
+    wrappable_struct, AnyException, AnyObject, Array, Boolean, Exception, Fixnum, Float, NilClass,
+    Object, Symbol,
 };
 use std::rc::Rc;
-use wasmer_runtime::{self as runtime, imports, Export};
+use wasmer_runtime::{self as runtime};
 use wasmer_runtime_core::types::Type;
 
 /// The `ExportedFunctions` Ruby class.
@@ -217,101 +214,3 @@ pub extern "C" fn ruby_exported_functions_method_missing(
             .method_missing(method_name, arguments)
     })
 }
-
-/// The `Instance` Ruby class.
-pub struct Instance {
-    /// The WebAssembly instance.
-    instance: Rc<runtime::Instance>,
-}
-
-impl Instance {
-    /// Create a new instance of the `Instance` Ruby class.
-    /// The constructor receives bytes from a string.
-    pub fn new(bytes: &[u8]) -> Result<Self, AnyException> {
-        let import_object = imports! {};
-
-        Ok(Self {
-            instance: Rc::new(runtime::instantiate(bytes, &import_object).map_err(|e| {
-                AnyException::new(
-                    "RuntimeError",
-                    Some(&format!("Failed to instantiate the module:\n    {}", e)),
-                )
-            })?),
-        })
-    }
-}
-
-wrappable_struct!(Instance, InstanceWrapper, INSTANCE_WRAPPER);
-
-class!(RubyInstance);
-
-#[rustfmt::skip]
-methods!(
-    RubyInstance,
-    _itself,
-
-    // Glue code to call the `Instance.new` method.
-    fn ruby_instance_new(bytes: RString) -> AnyObject {
-        unwrap_or_raise(|| {
-            let instance = Instance::new(
-                bytes
-                    .map_err(|_| {
-                        AnyException::new(
-                            "ArgumentError",
-                            Some("WebAssembly module must be represented by Ruby bytes only."),
-                        )
-                    })?
-                    .to_bytes_unchecked(),
-            )?;
-            let exported_functions = ExportedFunctions::new(instance.instance.clone());
-
-            let memory = instance
-                .instance
-                .exports()
-                .find_map(|(_, export)| match export {
-                    Export::Memory(memory) => Some(Memory::new(Rc::new(memory))),
-                    _ => None,
-                })
-                .ok_or_else(|| {
-                    AnyException::new(
-                        "RuntimeError",
-                        Some("The WebAssembly module has no exported memory."),
-                    )
-                })?;
-
-            let wasmer_module = Module::from_existing("Wasmer");
-
-            let mut ruby_instance: AnyObject = wasmer_module
-                .get_nested_class("Instance")
-                .wrap_data(instance, &*INSTANCE_WRAPPER);
-
-            let ruby_exported_functions: RubyExportedFunctions = wasmer_module
-                .get_nested_class("ExportedFunctions")
-                .wrap_data(exported_functions, &*EXPORTED_FUNCTIONS_WRAPPER);
-
-            ruby_instance.instance_variable_set("@exports", ruby_exported_functions);
-
-            let ruby_memory: RubyMemory = wasmer_module
-                .get_nested_class("Memory")
-                .wrap_data(memory, &*MEMORY_WRAPPER);
-
-            ruby_instance.instance_variable_set("@memory", ruby_memory);
-
-            Ok(ruby_instance)
-        })
-    }
-
-    // Glue code to call the `Instance.exports` getter method.
-    fn ruby_instance_exported_functions() -> RubyExportedFunctions {
-        unsafe {
-            _itself
-                .instance_variable_get("@exports")
-                .to::<RubyExportedFunctions>()
-        }
-    }
-
-    // Glue code to call the `Instance.memory` getter method.
-    fn ruby_instance_memory() -> RubyMemory {
-        unsafe { _itself.instance_variable_get("@memory").to::<RubyMemory>() }
-    }
-);
diff --git a/src/instance/mod.rs b/src/instance/mod.rs
new file mode 100644
index 0000000..a7cb758
--- /dev/null
+++ b/src/instance/mod.rs
@@ -0,0 +1,119 @@
+//! The `Instance` WebAssembly class.
+
+pub mod exports;
+
+use crate::{
+    error::unwrap_or_raise,
+    instance::exports::{ExportedFunctions, RubyExportedFunctions, EXPORTED_FUNCTIONS_WRAPPER},
+    memory::{Memory, RubyMemory, MEMORY_WRAPPER},
+};
+use lazy_static::lazy_static;
+use rutie::{
+    class, methods, wrappable_struct, AnyException, AnyObject, Exception, Module, Object, RString,
+};
+use std::rc::Rc;
+use wasmer_runtime::{self as runtime, imports, Export};
+
+/// The `Instance` Ruby class.
+pub struct Instance {
+    /// The WebAssembly instance.
+    instance: Rc<runtime::Instance>,
+}
+
+impl Instance {
+    /// Create a new instance of the `Instance` Ruby class.
+    /// The constructor receives bytes from a string.
+    pub fn new(bytes: &[u8]) -> Result<Self, AnyException> {
+        let import_object = imports! {};
+
+        Ok(Self {
+            instance: Rc::new(runtime::instantiate(bytes, &import_object).map_err(|e| {
+                AnyException::new(
+                    "RuntimeError",
+                    Some(&format!("Failed to instantiate the module:\n    {}", e)),
+                )
+            })?),
+        })
+    }
+}
+
+wrappable_struct!(Instance, InstanceWrapper, INSTANCE_WRAPPER);
+
+class!(RubyInstance);
+
+#[rustfmt::skip]
+methods!(
+    RubyInstance,
+    _itself,
+
+    // Glue code to call the `Instance.new` method.
+    fn ruby_instance_new(bytes: RString) -> AnyObject {
+        unwrap_or_raise(|| {
+            let instance = Instance::new(
+                bytes
+                    .map_err(|_| {
+                        AnyException::new(
+                            "ArgumentError",
+                            Some("WebAssembly module must be represented by Ruby bytes only."),
+                        )
+                    })?
+                    .to_bytes_unchecked(),
+            )?;
+            let exported_functions = ExportedFunctions::new(instance.instance.clone());
+            let exported_memory =
+                instance
+                    .instance
+                    .exports()
+                    .find_map(|(_, export)| match export {
+                        Export::Memory(memory) => Some(Memory::new(Rc::new(memory))),
+                        _ => None,
+                    });
+
+            let wasmer_module = Module::from_existing("Wasmer");
+
+            let mut ruby_instance: AnyObject = wasmer_module
+                .get_nested_class("Instance")
+                .wrap_data(instance, &*INSTANCE_WRAPPER);
+
+            let ruby_exported_functions: RubyExportedFunctions = wasmer_module
+                .get_nested_class("ExportedFunctions")
+                .wrap_data(exported_functions, &*EXPORTED_FUNCTIONS_WRAPPER);
+
+            ruby_instance.instance_variable_set("@exports", ruby_exported_functions);
+
+            if let Some(exported_memory) = exported_memory {
+                let ruby_exported_memory: RubyMemory = wasmer_module
+                    .get_nested_class("Memory")
+                    .wrap_data(exported_memory, &*MEMORY_WRAPPER);
+                ruby_instance.instance_variable_set("@memory", ruby_exported_memory);
+            }
+
+            Ok(ruby_instance)
+        })
+    }
+
+    // Glue code to call the `Instance.exports` getter method.
+    fn ruby_instance_exported_functions() -> RubyExportedFunctions {
+        unsafe {
+            _itself
+                .instance_variable_get("@exports")
+                .to::<RubyExportedFunctions>()
+        }
+    }
+
+    // Glue code to call the `Instance.memory` getter method.
+    fn ruby_instance_memory() -> RubyMemory {
+        unwrap_or_raise(|| {
+            let memory = _itself.instance_variable_get("@memory");
+
+            if !memory.is_nil() {
+                Ok(unsafe { memory.to::<RubyMemory>() })
+            } else {
+                Err(AnyException::new(
+                    "RuntimeError",
+                    Some("The WebAssembly module has no exported memory."),
+                ))
+            }
+        })
+    }
+);
diff --git a/src/lib.rs b/src/lib.rs
index 68bf481..5f1a718 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -37,13 +37,13 @@ pub extern "C" fn Init_wasmer() {
             // Declare the `respond_to_missing?` method.
             itself.def(
                 "respond_to_missing?",
-                instance::ruby_exported_functions_method_exists,
+                instance::exports::ruby_exported_functions_method_exists,
             );
 
             // Declare the `method_missing` method.
             itself.def(
                 "method_missing",
-                instance::ruby_exported_functions_method_missing,
+                instance::exports::ruby_exported_functions_method_missing,
             );
         });
 
diff --git a/tests/instance_test.rb b/tests/instance_test.rb
index 0d3c99a..1c1b566 100644
--- a/tests/instance_test.rb
+++ b/tests/instance_test.rb
@@ -20,10 +20,10 @@ def test_constructor_needs_bytes
     assert_equal "WebAssembly module must be represented by Ruby bytes only.", error.message
   end
 
-  def test_module_must_have_an_exported_memory
+  def test_module_without_an_exported_memory
+    bytes = IO.read File.expand_path("no_memory.wasm", File.dirname(__FILE__)), mode: "rb"
     error = assert_raises(RuntimeError) {
-      bytes = IO.read File.expand_path("no_memory.wasm", File.dirname(__FILE__)), mode: "rb"
-      Wasmer::Instance.new bytes
+      Wasmer::Instance.new(bytes).memory
     }
     assert_equal "The WebAssembly module has no exported memory.", error.message
   end