Use criterion for benchmarking, add some simple benchmarks

Cargo.toml

@@ -22,7 +22,7 @@ default = ["builtin-lua"]
 #   * LUA_NUMBER as double
 #   * LUA_EXTRASPACE is sizeof(void*)
 #   * LUAI_MAXSTACK is 1000000
-builtin-lua = ["gcc"]
+builtin-lua = ["cc"]
 
 [dependencies]
 libc = { version = "0.2" }
@@ -30,7 +30,12 @@ failure = { version = "0.1.1" }
 compiletest_rs = { version = "0.3", optional = true }
 
 [build-dependencies]
-gcc = { version = "0.3.52", optional = true }
+cc = { version = "1.0", optional = true }
 
 [dev-dependencies]
-rustyline = "1.0.0"
+rustyline = "1.0.0"
+criterion = "0.2.0"
+
+[[bench]]
+name = "benchmark"
+harness = false

benches/benchmark.rs

@@ -0,0 +1,49 @@
+#[macro_use]
+extern crate criterion;
+extern crate rlua;
+
+use criterion::Criterion;
+use rlua::prelude::*;
+
+fn create_table(lua: Lua) -> Lua {
+    {
+        lua.create_table().unwrap();
+    }
+    lua
+}
+
+fn create_array(lua: Lua) -> Lua {
+    {
+        let table = lua.create_table().unwrap();
+        for i in 1..11 {
+            table.set(i, i).unwrap();
+        }
+    }
+    lua
+}
+
+fn create_string_table(lua: Lua) -> Lua {
+    {
+        let table = lua.create_table().unwrap();
+        for &s in &["1", "2", "3", "4", "5", "6", "7", "8", "9", "10"] {
+            let s = lua.create_string(s).unwrap();
+            table.set(s.clone(), s).unwrap();
+        }
+    }
+    lua
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("create_table", |b| {
+        b.iter_with_setup(|| Lua::new(), create_table)
+    });
+    c.bench_function("create_array", |b| {
+        b.iter_with_setup(|| Lua::new(), create_array)
+    });
+    c.bench_function("create_string_table", |b| {
+        b.iter_with_setup(|| Lua::new(), create_string_table)
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);

build.rs

@@ -1,5 +1,5 @@
 #[cfg(feature = "builtin-lua")]
-extern crate gcc;
+extern crate cc;
 
 fn main() {
     #[cfg(feature = "builtin-lua")]
@@ -9,7 +9,7 @@ fn main() {
         let target_os = env::var("CARGO_CFG_TARGET_OS");
         let target_family = env::var("CARGO_CFG_TARGET_FAMILY");
 
-        let mut config = gcc::Build::new();
+        let mut config = cc::Build::new();
 
         if target_os == Ok("linux".to_string()) {
             config.define("LUA_USE_LINUX", None);