handle debugger keyword in asm2wasm

2 files changed, 22 insertions, 1 deletions

diff --git a/src/asm2wasm.h b/src/asm2wasm.h
index 5d88b8f38..588754580 100644
--- a/src/asm2wasm.h
+++ b/src/asm2wasm.h
@@ -33,7 +33,8 @@ IString GLOBAL("global"), NAN_("NaN"), INFINITY_("Infinity"),
         FROUND("fround"),
         ASM2WASM("asm2wasm"),
         F64_REM("f64-rem"),
-        F64_TO_INT("f64-to-int");
+        F64_TO_INT("f64-to-int"),
+        DEBUGGER("debugger");
 
 
 static void abort_on(std::string why) {
@@ -758,6 +759,23 @@ Function* Asm2WasmBuilder::processFunction(Ref ast) {
         ret->type = asmToWasmType(asmData.getType(name));
         return ret;
       }
+      if (name == DEBUGGER) {
+        CallImport *call = allocator.alloc<CallImport>();
+        call->target = DEBUGGER;
+        call->type = none;
+        static bool addedImport = false;
+        if (!addedImport) {
+          addedImport = true;
+          auto import = allocator.alloc<Import>(); // debugger = asm2wasm.debugger;
+          import->name = DEBUGGER;
+          import->module = ASM2WASM;
+          import->base = DEBUGGER;
+          import->type.name = DEBUGGER;
+          import->type.result = none;
+          wasm.addImport(import);
+        }
+        return call;
+      }
       // global var, do a load from memory
       assert(mappedGlobals.find(name) != mappedGlobals.end());
       MappedGlobal global = mappedGlobals[name];
diff --git a/src/js/post.js b/src/js/post.js
index 5c854b3df..8e57c4a06 100644
--- a/src/js/post.js
+++ b/src/js/post.js
@@ -35,6 +35,9 @@
       "f64-to-int": function(x) {
         return x | 0;
       },
+      "debugger": function() {
+        debugger;
+      },
     },
     parent: Module // Module inside wasm-js.cpp refers to wasm-js.cpp; this allows access to the outside program.
   };