4 files changed, 32 insertions, 1 deletions
diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index 15635c940..7901f46d3 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -969,6 +969,27 @@ void BinaryenModuleOptimize(BinaryenModuleRef module) {
   passRunner.run();
 }
 
+void BinaryenModuleRunPasses(BinaryenModuleRef module, const char **passes, BinaryenIndex numPasses) {
+  if (tracing) {
+    std::cout << "  {\n";
+    std::cout << "    const char* passes[] = { ";
+    for (BinaryenIndex i = 0; i < numPasses; i++) {
+      if (i > 0) std::cout << ", ";
+      std::cout << "\"" << passes[i] << "\"";
+    }
+    std::cout << " };\n";
+    std::cout << "    BinaryenModuleRunPasses(the_module, passes, " << numPasses << ");\n";
+    std::cout << "  }\n";
+  }
+
+  Module* wasm = (Module*)module;
+  PassRunner passRunner(wasm);
+  for (BinaryenIndex i = 0; i < numPasses; i++) {
+    passRunner.add(passes[i]);
+  }
+  passRunner.run();
+}
+
 void BinaryenModuleAutoDrop(BinaryenModuleRef module) {
   if (tracing) {
     std::cout << "  BinaryenModuleAutoDrop(the_module);\n";
diff --git a/src/binaryen-c.h b/src/binaryen-c.h
index d6e420546..0b3f5cc85 100644
--- a/src/binaryen-c.h
+++ b/src/binaryen-c.h
@@ -391,6 +391,9 @@ int BinaryenModuleValidate(BinaryenModuleRef module);
 // Run the standard optimization passes on the module.
 void BinaryenModuleOptimize(BinaryenModuleRef module);
 
+// Runs the specified passes on the module.
+void BinaryenModuleRunPasses(BinaryenModuleRef module, const char **passes, BinaryenIndex numPasses);
+
 // Auto-generate drop() operations where needed. This lets you generate code without
 // worrying about where they are needed. (It is more efficient to do it yourself,
 // but simpler to use autodrop).
diff --git a/src/js/binaryen.js-post.js b/src/js/binaryen.js-post.js
index 985691494..d4e2cbf80 100644
--- a/src/js/binaryen.js-post.js
+++ b/src/js/binaryen.js-post.js
@@ -847,6 +847,13 @@
     this['optimize'] = function() {
       return Module['_BinaryenModuleOptimize'](module);
     };
+    this['runPasses'] = function(passes) {
+      return preserveStack(function() {
+        return Module['_BinaryenModuleRunPasses'](module, i32sToStack(
+          passes.map(strToStack)
+        ), passes.length);
+      });
+    }
     this['autoDrop'] = function() {
       return Module['_BinaryenModuleAutoDrop'](module);
     };
diff --git a/src/wasm-js.cpp b/src/wasm-js.cpp
index efc316a22..0a0961066 100644
--- a/src/wasm-js.cpp
+++ b/src/wasm-js.cpp
@@ -80,7 +80,7 @@ extern "C" void EMSCRIPTEN_KEEPALIVE load_asm2wasm(char *input) {
   module->memory.max = pre.memoryGrowth ? Address(Memory::kMaxSize) : module->memory.initial;
 
   if (wasmJSDebug) std::cerr << "wasming...\n";
-  asm2wasm = new Asm2WasmBuilder(*module, pre, debug, Asm2WasmBuilder::TrapMode::JS, PassOptions(), true /* runJSFFIPass */, false /* TODO: support optimizing? */, false /* TODO: support asm2wasm-i64? */);
+  asm2wasm = new Asm2WasmBuilder(*module, pre, debug, TrapMode::JS, PassOptions(), true /* runJSFFIPass */, false /* TODO: support optimizing? */, false /* TODO: support asm2wasm-i64? */);
   asm2wasm->processAsm(asmjs);
 }