Added emtests

build/emtests.rs

@@ -4,24 +4,79 @@
 //! - Compile using emcc and get the .wasm from it (wasm)
 //! - Generate the test that will compare the output of running the .wasm file
 //!   with wasmer with the expected output
-use std::env;
 use std::fs;
 use std::path::PathBuf;
+use std::process::Command;
+
 
 static BANNER: &str = "// Rust test file autogenerated with cargo build (build/emtests.rs).
 // Please do NOT modify it by hand, as it will be reseted on next build.\n";
 
 const TESTS: [&str; 1] = [
-    "emtests/localtime.c"
+    "emtests/printf.c"
 ];
 
+pub fn compile(file: &str) -> String {
+    let mut output_path = PathBuf::from(file);
+    output_path.set_extension("out");
+    let output_str = output_path.to_str().unwrap();
+
+    // Compile to .out
+    Command::new("cc")
+            .arg(file)
+            .arg("-o")
+            .arg(output_str)
+            .output()
+            .expect("failed to execute process");
+
+    // Get the result of .out
+    let output = Command::new(output_str)
+            .arg(output_str)
+            .output()
+            .expect("failed to execute process");
+
+    // Remove executable
+    fs::remove_file(output_str).unwrap();
+
+    let mut output_path = PathBuf::from(file);
+    output_path.set_extension("js");
+    let output_str = output_path.to_str().unwrap();
+
+    // Compile to wasm
+    Command::new("emcc")
+            .arg(file)
+            .arg("-s").arg("WASM=1")
+            .arg("-o")
+            .arg(output_str)
+            .output()
+            .expect("failed to execute process");
+
+    // Remove js file
+    fs::remove_file(output_str).unwrap();
+
+    let mut output_path = PathBuf::from(file);
+    output_path.set_extension("output");
+    let module_name = output_path.file_stem().unwrap().to_str().unwrap().to_owned();
+
+    let output_str = output_path.to_str().unwrap();
+
+    // Write the output to file
+    fs::write(output_str, output.stdout).expect("Unable to write file");
+
+    module_name
+
+    // panic!("OUTPUT: {:?}", output);
+}
 
 pub fn build() {
     let rust_test_modpath = concat!(env!("CARGO_MANIFEST_DIR"), "/src/emtests/mod.rs");
 
     let mut modules: Vec<String> = Vec::new();
     // modules.reserve_exact(TESTS.len());
-
+    for test in TESTS.iter() {
+        let moudle_name = compile(test);
+        modules.push(format!("mod {};", moudle_name));
+    }
     modules.insert(0, BANNER.to_string());
     // We add an empty line
     modules.push("".to_string());

emtests/README.md

@@ -3,6 +3,18 @@ This directory contains tests for unit testing each of the functions/syscalls th
 If you want to generate the wasm files, you will just need to:
 
 ```
+make emtests
+```
+
+This process will do something similar to:
+
+```
+cc localtime.c -o localtime.out
+# Execute the out file and save its output
+./localtime.out > ./localtime.output
+rm localtime.out
+
+# Generate the .wasm file
 emcc localtime.c -o localtime.js
 # Delte the js file, as we don't need it
 rm localtime.js