First C example for issue #11

examples/README.md

@@ -8,4 +8,10 @@ Compile Rust to WASM and then to the JVM. In order of complexity:
 
 * [rust-simple](rust-simple)
 * [rust-string](rust-string)
-* [rust-regex](rust-regex)
+* [rust-regex](rust-regex)
+
+### C/C++
+
+Compile C to WASM and then to the JVM. In order of complexity:
+
+* [c-simple](c-simple)

examples/c-simple/README.md

@@ -0,0 +1,14 @@
+### Example: C Simple
+
+This shows a simple example of compiling C to WASM and then to the JVM. This is the C version of
+[rust-simple](../rust-simple).
+
+In order to run the C or C++ examples, the latest LLVM binaries must be on the `PATH`, built with the experimental
+WebAssembly target. This can be built by passing `-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly` to `cmake` when
+building WebAssembly. Or it can be downloaded from a nightly build site
+([this one](http://gsdview.appspot.com/wasm-llvm/builds/) was used for these examples at the time of writing).
+
+Everything else is basically the same as [rust-simple](../rust-simple) except with C code and using `clang`. To run
+execute the following from the root `asmble` dir:
+
+    gradlew --no-daemon :examples:c-simple:run

examples/c-simple/src/lib.c

@@ -0,0 +1,3 @@
+int addOne(int x) {
+  return x + 1;
+}

examples/c-simple/src/main/java/asmble/examples/csimple/Main.java

@@ -0,0 +1,13 @@
+package asmble.examples.csimple;
+
+import java.lang.invoke.MethodHandle;
+
+import asmble.generated.CSimple;
+
+class Main {
+    public static void main(String[] args) {
+        // Doesn't need memory or method table
+        CSimple simple = new CSimple(0, new MethodHandle[0]);
+        System.out.println("25 + 1 = " + simple.addOne(25));
+    }
+}