Add a benchmark for calling from C++ into JS via interfaces

3 files changed, 96 insertions, 3 deletions

diff --git a/tests/embind/build_benchmark b/tests/embind/build_benchmark
new file mode 100755
index 00000000..f878a2d4
--- /dev/null
+++ b/tests/embind/build_benchmark
@@ -0,0 +1,2 @@
+#!/bin/bash
+EMCC_LLVM_TARGET=le32-unknown-nacl ~/projects/emscripten/emcc --minify 0 --bind --pre-js embind.benchmark.js -O2 --shell-file shell.html -o embind_benchmark.html embind_benchmark.cpp
diff --git a/tests/embind/embind.benchmark.js b/tests/embind/embind.benchmark.js
index fcbd64ef..7b20db88 100644
--- a/tests/embind/embind.benchmark.js
+++ b/tests/embind/embind.benchmark.js
@@ -222,3 +222,29 @@ function _pass_gameobject_ptr_benchmark_embind_js() {
     Module.print("JS embind pass_gameobject_ptr " + N + " iters: " + (b-a) + " msecs.");
 }
 
+function _call_through_interface0() {
+    var N = 1000000;
+    var obj = Module['Interface'].implement({
+        call0: function() {
+        }
+    });
+    var start = _emscripten_get_now();
+    Module['callInterface0'](N, obj);
+    var elapsed = _emscripten_get_now() - start;
+    Module.print("C++ -> JS void through interface " + N + " iters: " + elapsed + " msecs.");
+    obj.delete();
+}
+
+function _call_through_interface1() {
+    var N = 1000000;
+    var obj = Module['Interface'].implement({
+        call1: function(s1, s2) {
+            return s1 + s2;
+        }
+    });
+    var start = _emscripten_get_now();
+    Module['callInterface1'](N, obj);
+    var elapsed = _emscripten_get_now() - start;
+    Module.print("C++ -> JS std::wstring through interface " + N + " iters: " + elapsed + " msecs.");
+    obj.delete();
+}
diff --git a/tests/embind/embind_benchmark.cpp b/tests/embind/embind_benchmark.cpp
index cdfe998c..b6a834c9 100644
--- a/tests/embind/embind_benchmark.cpp
+++ b/tests/embind/embind_benchmark.cpp
@@ -5,8 +5,7 @@
 
 int counter = 0;
 
-extern "C"
-{
+extern "C" {
 
 int __attribute__((noinline)) get_counter()
 {
@@ -48,6 +47,9 @@ extern void move_gameobjects_benchmark_embind_js();
 
 extern void pass_gameobject_ptr_benchmark();
 extern void pass_gameobject_ptr_benchmark_embind_js();
+
+extern void call_through_interface0();
+extern void call_through_interface1();
 }
 
 class Vec3
@@ -128,6 +130,56 @@ public:
     int class_counter;
 };
 
+class Interface
+{
+public:
+    virtual void call0() = 0;
+    virtual std::wstring call1(const std::wstring& str1, const std::wstring& str2) = 0;
+};
+
+class InterfaceWrapper : public emscripten::wrapper<Interface>
+{
+public:
+    EMSCRIPTEN_WRAPPER(InterfaceWrapper);
+
+    void call0() override {
+        return call<void>("call0");
+    }
+
+    std::wstring call1(const std::wstring& str1, const std::wstring& str2) {
+        return call<std::wstring>("call1", str1, str2);
+    }
+};
+
+void callInterface0(unsigned N, Interface& o) {
+    for (unsigned i = 0; i < N; i += 8) {
+        o.call0();
+        o.call0();
+        o.call0();
+        o.call0();
+        o.call0();
+        o.call0();
+        o.call0();
+        o.call0();
+    }
+}
+
+void callInterface1(unsigned N, Interface& o) {
+    static std::wstring foo(L"foo");
+    static std::wstring bar(L"bar");
+    static std::wstring baz(L"baz");
+    static std::wstring qux(L"qux");
+    for (unsigned i = 0; i < N; i += 7) {
+        o.call1(
+            o.call1(
+                o.call1(foo, bar),
+                o.call1(baz, qux)),
+            o.call1(
+                o.call1(qux, foo),
+                o.call1(bar, baz)));
+    }
+}
+
 EMSCRIPTEN_BINDINGS(benchmark)
 {
     using namespace emscripten;
@@ -164,7 +216,15 @@ EMSCRIPTEN_BINDINGS(benchmark)
         .constructor<>()
         .function("incr_global_counter", &Foo::incr_global_counter)
         .function("incr_class_counter", &Foo::incr_class_counter)
-        .function("class_counter_val", &Foo::class_counter_val);
+        .function("class_counter_val", &Foo::class_counter_val)
+        ;
+
+    class_<Interface>("Interface")
+        .allow_subclass<InterfaceWrapper>()
+        ;
+
+    function("callInterface0", &callInterface0);
+    function("callInterface1", &callInterface1);
 }
 
 void __attribute__((noinline)) emscripten_get_now_benchmark(int N)
@@ -334,6 +394,7 @@ void __attribute__((noinline)) pass_gameobject_ptr_benchmark()
 
 int main()
 {
+    /*
     for(int i = 1000; i <= 100000; i *= 10)
         emscripten_get_now_benchmark(i);
 
@@ -370,4 +431,8 @@ int main()
     printf("\n");
     pass_gameobject_ptr_benchmark();
     pass_gameobject_ptr_benchmark_embind_js();
+    */
+    emscripten_get_now();
+    call_through_interface0();
+    call_through_interface1();
 }