Prepare memory 64 support

CMakeLists.txt

@@ -6,6 +6,7 @@ option(MOMO_ENABLE_AVX2 "Enable AVX2 support" ON)
 option(MOMO_ENABLE_SANITIZER "Enable sanitizer" OFF)
 option(MOMO_ENABLE_CLANG_TIDY "Enable clang-tidy checks" OFF)
 option(MOMO_ENABLE_RUST_CODE "Enable code parts written in rust" ON)
+option(MOMO_EMSCRIPTEN_MEMORY64 "Enable memory 64 support for emscripten builds" OFF)
 option(MOMO_EMSCRIPTEN_SUPPORT_NODEJS "Enable Node.js filesystem for emscripten compilation" OFF)
 option(MOMO_BUILD_AS_LIBRARY "Configure and Build the emulator as a shared library (without the samples and tests)" OFF)
 

cmake/compiler-env.cmake

@@ -123,12 +123,26 @@ if(CMAKE_SYSTEM_NAME MATCHES "Emscripten")
     $<$<CONFIG:Debug>:-sASSERTIONS>
     -sWASM_BIGINT
     -sUSE_OFFSET_CONVERTER
-    -sMAXIMUM_MEMORY=4gb
     #-sEXCEPTION_CATCHING_ALLOWED=[..]
     -sEXIT_RUNTIME
     -sASYNCIFY
   )
 
+  if(MOMO_EMSCRIPTEN_MEMORY64)
+    momo_add_c_and_cxx_compile_options(
+      -sMEMORY64
+    )
+
+    add_link_options(
+      -sMAXIMUM_MEMORY=8gb
+      -sMEMORY64
+    )
+  else()
+    add_link_options(
+      -sMAXIMUM_MEMORY=4gb
+    )
+  endif()
+
   if(MOMO_EMSCRIPTEN_SUPPORT_NODEJS)
     add_link_options(
       -lnodefs.js -sNODERAWFS=1

src/debugger/message_transmitter.cpp

@@ -33,7 +33,7 @@ namespace debugger
             var message = getMessageFromQueue();
             if (!message || message.length == 0)
             {
-                return null;
+                return 0;
             }
 
             const length = lengthBytesUTF8(message) + 1;