diff --git a/samples/clock/src/main.c b/samples/clock/src/main.c
index e5b21ac..fefd5ee 100644
--- a/samples/clock/src/main.c
+++ b/samples/clock/src/main.c
@@ -19,7 +19,7 @@ f32 minf(f32 a, f32 b);
 
 ORCA_EXPORT void oc_on_init(void)
 {
-    oc_runtime_window_set_title(OC_STR8("clock"));
+    oc_window_set_title(OC_STR8("clock"));
     oc_runtime_window_set_size((oc_vec2){ .x = 400, .y = 400 });
 
     surface = oc_surface_canvas();
diff --git a/samples/fluid/src/main.c b/samples/fluid/src/main.c
index b86e9a6..019019a 100644
--- a/samples/fluid/src/main.c
+++ b/samples/fluid/src/main.c
@@ -615,7 +615,7 @@ ORCA_EXPORT void oc_on_init()
 {
     oc_log_info("Hello, world (from C)");
 
-    oc_runtime_window_set_title(OC_STR8("fluid"));
+    oc_window_set_title(OC_STR8("fluid"));
 
     surface = oc_surface_gles();
     oc_surface_select(surface);
diff --git a/samples/glesTriangle/src/main.c b/samples/glesTriangle/src/main.c
index 9ccb81a..b5a09cc 100644
--- a/samples/glesTriangle/src/main.c
+++ b/samples/glesTriangle/src/main.c
@@ -37,7 +37,7 @@ void compile_shader(GLuint shader, const char* source)
 
 ORCA_EXPORT void oc_on_init(void)
 {
-    oc_runtime_window_set_title(OC_STR8("triangle"));
+    oc_window_set_title(OC_STR8("triangle"));
 
     surface = oc_surface_gles();
     oc_surface_select(surface);
diff --git a/samples/pong/src/main.c b/samples/pong/src/main.c
index 978eb94..0cfb47a 100644
--- a/samples/pong/src/main.c
+++ b/samples/pong/src/main.c
@@ -69,7 +69,7 @@ oc_str8 loadFile(oc_arena* arena, oc_str8 filename)
 
 ORCA_EXPORT void oc_on_init(void)
 {
-    oc_runtime_window_set_title(OC_STR8("pong"));
+    oc_window_set_title(OC_STR8("pong"));
 
     surface = oc_surface_canvas();
     canvas = oc_canvas_create();
diff --git a/samples/ui/src/main.c b/samples/ui/src/main.c
index 48c0f9c..72ef890 100644
--- a/samples/ui/src/main.c
+++ b/samples/ui/src/main.c
@@ -10,7 +10,7 @@ oc_arena textArena = { 0 };
 
 ORCA_EXPORT void oc_on_init(void)
 {
-    oc_runtime_window_set_title(OC_STR8("ui"));
+    oc_window_set_title(OC_STR8("ui"));
 
     surface = oc_surface_canvas();
     canvas = oc_canvas_create();
diff --git a/src/app/app.h b/src/app/app.h
index 3f1005c..a99a5a7 100644
--- a/src/app/app.h
+++ b/src/app/app.h
@@ -457,9 +457,10 @@ ORCA_API int oc_directory_create(oc_str8 path);
 
 #else
 
+void oc_window_set_title(oc_str8 title);
+void oc_window_set_size(oc_vec2 size);
+
 void ORCA_IMPORT(oc_request_quit)(void);
-void ORCA_IMPORT(oc_runtime_window_set_title)(oc_str8 title);
-void ORCA_IMPORT(oc_runtime_window_set_size)(oc_vec2 size);
 
 #endif // !defined(OC_PLATFORM_ORCA) || !(OC_PLATFORM_ORCA)
 
diff --git a/src/platform/orca_debug.c b/src/platform/orca_debug.c
index 2ccdc5a..a71742e 100644
--- a/src/platform/orca_debug.c
+++ b/src/platform/orca_debug.c
@@ -49,7 +49,7 @@ typedef struct oc_log_output
 static oc_log_output oc_logDefaultOutput = { .kind = ORCA_LOG_OUTPUT_CONSOLE };
 oc_log_output* OC_LOG_DEFAULT_OUTPUT = &oc_logDefaultOutput;
 
-void ORCA_IMPORT(oc_runtime_log)(oc_log_level level,
+void ORCA_IMPORT(oc_bridge_log)(oc_log_level level,
                                  int fileLen,
                                  const char* file,
                                  int functionLen,
@@ -77,7 +77,7 @@ void platform_log_push(oc_log_output* output,
 
     oc_str8 string = oc_str8_list_join(scratch, ctx.list);
 
-    oc_runtime_log(level, strlen(file), file, strlen(function), function, line, oc_str8_ip(string));
+    oc_bridge_log(level, strlen(file), file, strlen(function), function, line, oc_str8_ip(string));
 
     oc_arena_scope_end(tmp);
 }
@@ -86,8 +86,8 @@ void platform_log_push(oc_log_output* output,
 // Assert/Abort
 //----------------------------------------------------------------
 
-_Noreturn void ORCA_IMPORT(oc_runtime_abort_ext)(const char* file, const char* function, int line, const char* msg);
-_Noreturn void ORCA_IMPORT(oc_runtime_assert_fail)(const char* file, const char* function, int line, const char* src, const char* msg);
+_Noreturn void ORCA_IMPORT(oc_bridge_abort_ext)(const char* file, const char* function, int line, const char* msg);
+_Noreturn void ORCA_IMPORT(oc_bridge_assert_fail)(const char* file, const char* function, int line, const char* src, const char* msg);
 
 _Noreturn void oc_abort_ext(const char* file, const char* function, int line, const char* fmt, ...)
 {
@@ -108,7 +108,7 @@ _Noreturn void oc_abort_ext(const char* file, const char* function, int line, co
 
     oc_str8 msg = oc_str8_list_join(scratch.arena, ctx.list);
 
-    oc_runtime_abort_ext(file, function, line, msg.ptr);
+    oc_bridge_abort_ext(file, function, line, msg.ptr);
 
     oc_scratch_end(scratch);
 }
@@ -132,7 +132,7 @@ _Noreturn void oc_assert_fail(const char* file, const char* function, int line,
 
     oc_str8 msg = oc_str8_list_join(scratch.arena, ctx.list);
 
-    oc_runtime_assert_fail(file, function, line, src, msg.ptr);
+    oc_bridge_assert_fail(file, function, line, src, msg.ptr);
 
     oc_scratch_end(scratch);
 }
diff --git a/src/runtime.c b/src/runtime.c
index 896c708..ac38895 100644
--- a/src/runtime.c
+++ b/src/runtime.c
@@ -56,11 +56,20 @@ oc_runtime* oc_runtime_get()
     return (&__orcaApp);
 }
 
-oc_runtime_env* oc_runtime_env_get()
+oc_wasm_env* oc_runtime_get_env()
 {
     return (&__orcaApp.env);
 }
 
+oc_str8 oc_runtime_get_wasm_memory()
+{
+    oc_str8 mem = { 0 };
+    u32 size = 0;
+    mem.ptr = (char*)m3_GetMemory(__orcaApp.env.m3Runtime, &size, 0);
+    mem.len = size;
+    return (mem);
+}
+
 void orca_wasm3_abort(IM3Runtime runtime, M3Result res, const char* file, const char* function, int line, const char* msg)
 {
     M3ErrorInfo errInfo = { 0 };
@@ -75,67 +84,21 @@ void orca_wasm3_abort(IM3Runtime runtime, M3Result res, const char* file, const
     }
 }
 
-#define ORCA_WASM3_ABORT(runtime, err, msg) orca_wasm3_abort(runtime, err, __FILE__, __FUNCTION__, __LINE__, msg)
-
-void* oc_runtime_env_ptr_to_native(oc_runtime_env* env, void* wasmPtr, u32 length)
+void oc_bridge_window_set_title(oc_wasm_str8 title)
 {
-    // We can't use the runtime's memory pointer directly because wasm3 embeds a
-    // header at the beginning of the block we give it.
-    u64 bufferIndex = (u64)wasmPtr & 0xffffffff;
-    u32 memSize = 0;
-    char* memory = (char*)m3_GetMemory(env->m3Runtime, &memSize, 0);
-
-    if(bufferIndex + length < memSize)
+    oc_str8 nativeTitle = oc_wasm_str8_to_native(title);
+    if(nativeTitle.ptr)
     {
-        char* nativePtr = memory + bufferIndex;
-        return nativePtr;
-    }
-    //TODO directly abort here?
-
-    return NULL;
-}
-
-void* oc_runtime_ptr_to_native(oc_runtime* orca, void* wasmPtr, u32 length)
-{
-    return (oc_runtime_env_ptr_to_native(&orca->env, wasmPtr, length));
-}
-
-void* oc_wasm_arena_push(oc_runtime_env* env, i32 arenaIndex, u64 size)
-{
-    void* retValues[1] = { 0 };
-    const void* retPointers[1] = { &retValues[0] };
-    const void* args[2] = { &arenaIndex, &size };
-
-    M3Result res = m3_Call(env->exports[OC_EXPORT_ARENA_PUSH], 2, args);
-    if(res)
-    {
-        ORCA_WASM3_ABORT(env->m3Runtime, res, "Runtime error");
-    }
-
-    res = m3_GetResults(env->exports[OC_EXPORT_ARENA_PUSH], 1, retPointers);
-    if(res)
-    {
-        ORCA_WASM3_ABORT(env->m3Runtime, res, "Runtime error");
-    }
-    void* ptr = oc_runtime_env_ptr_to_native(env, retValues[0], size);
-    return (ptr);
-}
-
-void oc_runtime_window_set_title(oc_str8 title)
-{
-    title.ptr = oc_runtime_ptr_to_native(oc_runtime_get(), title.ptr, title.len);
-    if(title.ptr)
-    {
-        oc_window_set_title(__orcaApp.window, title);
+        oc_window_set_title(__orcaApp.window, nativeTitle);
     }
 }
 
-void oc_runtime_window_set_size(oc_vec2 size)
+void oc_bridge_window_set_size(oc_vec2 size)
 {
     oc_window_set_content_size(__orcaApp.window, size);
 }
 
-void oc_runtime_log(oc_log_level level,
+void oc_bridge_log(oc_log_level level,
                     int fileLen,
                     char* file,
                     int functionLen,
@@ -372,9 +335,9 @@ char m3_type_to_tag(M3ValueType type)
     }
 }
 
-void oc_runtime_env_init(oc_runtime_env* runtime)
+void oc_wasm_env_init(oc_wasm_env* runtime)
 {
-    memset(runtime, 0, sizeof(oc_runtime_env));
+    memset(runtime, 0, sizeof(oc_wasm_env));
     oc_base_allocator* allocator = oc_base_allocator_default();
     runtime->wasmMemory.committed = 0;
     runtime->wasmMemory.reserved = 4ULL << 30;
@@ -392,7 +355,7 @@ i32 orca_runloop(void* user)
 {
     oc_runtime* app = &__orcaApp;
 
-    oc_runtime_env_init(&app->env);
+    oc_wasm_env_init(&app->env);
 
     //NOTE: loads wasm module
     const char* bundleNameCString = "module";
@@ -418,7 +381,7 @@ i32 orca_runloop(void* user)
 
     app->env.m3Runtime = m3_NewRuntime(app->env.m3Env, stackSize, NULL);
     //NOTE: host memory will be freed when runtime is freed.
-    m3_RuntimeSetMemoryCallbacks(app->env.m3Runtime, wasm_memory_resize_callback, wasm_memory_free_callback, &app->env.wasmMemory);
+    m3_RuntimeSetMemoryCallbacks(app->env.m3Runtime, oc_wasm_memory_resize_callback, oc_wasm_memory_free_callback, &app->env.wasmMemory);
 
     M3Result res = m3_ParseModule(app->env.m3Env, &app->env.m3Module, (u8*)app->env.wasmBytecode.ptr, app->env.wasmBytecode.len);
     if(res)
@@ -569,7 +532,7 @@ i32 orca_runloop(void* user)
             if(exports[OC_EXPORT_RAW_EVENT])
             {
 #ifndef M3_BIG_ENDIAN
-                oc_event* eventPtr = (oc_event*)wasm_memory_offset_to_ptr(&app->env.wasmMemory, app->env.rawEventOffset);
+                oc_event* eventPtr = (oc_event*)oc_wasm_address_to_ptr(app->env.rawEventOffset, sizeof(oc_event));
                 memcpy(eventPtr, event, sizeof(*event));
 
                 const void* args[1] = { &app->env.rawEventOffset };
diff --git a/src/runtime.h b/src/runtime.h
index ae958e9..133670e 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -54,18 +54,18 @@ const oc_export_desc OC_EXPORT_DESC[] = {
 #undef OC_STR8_LIT
 };
 
-typedef struct wasm_memory
+typedef struct oc_wasm_memory
 {
     char* ptr;
     u64 reserved;
     u64 committed;
 
-} wasm_memory;
+} oc_wasm_memory;
 
-typedef struct oc_runtime_env
+typedef struct oc_wasm_env
 {
     oc_str8 wasmBytecode;
-    wasm_memory wasmMemory;
+    oc_wasm_memory wasmMemory;
 
     // wasm3 data
     IM3Environment m3Env;
@@ -74,7 +74,7 @@ typedef struct oc_runtime_env
     IM3Function exports[OC_EXPORT_COUNT];
     u32 rawEventOffset;
 
-} oc_runtime_env;
+} oc_wasm_env;
 
 typedef struct log_entry
 {
@@ -114,20 +114,20 @@ typedef struct oc_runtime
 {
     bool quit;
     oc_window window;
+    oc_debug_overlay debugOverlay;
 
     oc_file_table fileTable;
     oc_file rootDir;
 
-    oc_runtime_env env;
-
-    oc_debug_overlay debugOverlay;
+    oc_wasm_env env;
 
 } oc_runtime;
 
-oc_runtime* oc_runtime_get();
-oc_runtime_env* oc_runtime_env_get();
+oc_runtime* oc_runtime_get(void);
+oc_wasm_env* oc_runtime_get_env(void);
+oc_str8 oc_runtime_get_wasm_memory(void);
 
-void* oc_runtime_ptr_to_native(oc_runtime* runtime, void* wasmPtr, u32 length);
-void* oc_wasm_arena_push(oc_runtime_env* env, i32 arenaIndex, u64 size);
+void orca_wasm3_abort(IM3Runtime runtime, M3Result res, const char* file, const char* function, int line, const char* msg);
+#define ORCA_WASM3_ABORT(runtime, err, msg) orca_wasm3_abort(runtime, err, __FILE__, __FUNCTION__, __LINE__, msg)
 
 #endif //__RUNTIME_H_
diff --git a/src/runtime_io.c b/src/runtime_io.c
index 5605e41..2fcb245 100644
--- a/src/runtime_io.c
+++ b/src/runtime_io.c
@@ -7,15 +7,17 @@
 *****************************************************************/
 #include "platform/platform_io_internal.h"
 #include "runtime.h"
+#include "runtime_memory.h"
 
-oc_io_cmp oc_runtime_io_wait_single_req(oc_io_req* wasmReq)
+oc_io_cmp oc_bridge_io_single_rect(oc_io_req* wasmReq)
 {
     oc_runtime* orca = oc_runtime_get();
 
     oc_io_cmp cmp = { 0 };
     oc_io_req req = *wasmReq;
 
-    void* buffer = oc_runtime_ptr_to_native(orca, req.buffer, req.size);
+    //TODO have a separate oc_wasm_io_req struct
+    void* buffer = oc_wasm_address_to_ptr((oc_wasm_addr)(uintptr_t)req.buffer, req.size);
 
     if(buffer)
     {
@@ -40,51 +42,20 @@ oc_io_cmp oc_runtime_io_wait_single_req(oc_io_req* wasmReq)
     return (cmp);
 }
 
-oc_file oc_file_open_with_request_bridge(oc_str8 path, oc_file_access rights, oc_file_open_flags flags)
+oc_file oc_file_open_with_request_bridge(oc_wasm_str8 path, oc_file_access rights, oc_file_open_flags flags)
 {
     oc_file file = oc_file_nil();
     oc_runtime* orca = oc_runtime_get();
 
-    path.ptr = oc_runtime_ptr_to_native(orca, path.ptr, path.len);
-    if(path.ptr)
+    oc_str8 nativePath = oc_wasm_str8_to_native(path);
+
+    if(nativePath.ptr)
     {
-        file = oc_file_open_with_request_for_table(path, rights, flags, &orca->fileTable);
+        file = oc_file_open_with_request_for_table(nativePath, rights, flags, &orca->fileTable);
     }
     return (file);
 }
 
-typedef struct oc_wasm_list
-{
-    u32 first;
-    u32 last;
-} oc_wasm_list;
-
-typedef struct oc_wasm_list_elt
-{
-    u32 prev;
-    u32 next;
-} oc_wasm_list_elt;
-
-typedef struct oc_wasm_str8
-{
-    u64 len;
-    u32 ptr;
-} oc_wasm_str8;
-
-typedef struct oc_wasm_str8_elt
-{
-    oc_wasm_list_elt listElt;
-    oc_wasm_str8 string;
-
-} oc_wasm_str8_elt;
-
-typedef struct oc_wasm_str8_list
-{
-    oc_wasm_list list;
-    u64 eltCount;
-    u64 len;
-} oc_wasm_str8_list;
-
 typedef struct oc_wasm_file_dialog_desc
 {
     oc_file_dialog_kind kind;
@@ -111,7 +82,7 @@ typedef struct oc_wasm_file_open_with_dialog_result
 
 } oc_wasm_file_open_with_dialog_result;
 
-oc_wasm_file_open_with_dialog_result oc_file_open_with_dialog_bridge(i32 wasmArenaIndex,
+oc_wasm_file_open_with_dialog_result oc_file_open_with_dialog_bridge(oc_wasm_addr wasmArena,
                                                                      oc_file_access rights,
                                                                      oc_file_open_flags flags,
                                                                      oc_wasm_file_dialog_desc* desc)
@@ -124,10 +95,10 @@ oc_wasm_file_open_with_dialog_result oc_file_open_with_dialog_bridge(i32 wasmAre
         .flags = desc->flags
     };
 
-    nativeDesc.title.ptr = oc_runtime_ptr_to_native(orca, (char*)(uintptr_t)desc->title.ptr, desc->title.len);
+    nativeDesc.title.ptr = oc_wasm_address_to_ptr(desc->title.ptr, desc->title.len);
     nativeDesc.title.len = desc->title.len;
 
-    nativeDesc.okLabel.ptr = oc_runtime_ptr_to_native(orca, (char*)(uintptr_t)desc->okLabel.ptr, desc->okLabel.len);
+    nativeDesc.okLabel.ptr = oc_wasm_address_to_ptr(desc->okLabel.ptr, desc->okLabel.len);
     nativeDesc.okLabel.len = desc->okLabel.len;
 
     if(oc_file_is_nil(desc->startAt) && desc->startPath.len)
@@ -138,17 +109,14 @@ oc_wasm_file_open_with_dialog_result oc_file_open_with_dialog_bridge(i32 wasmAre
     {
         nativeDesc.startAt = desc->startAt;
     }
-    nativeDesc.startPath.ptr = oc_runtime_ptr_to_native(orca, (char*)(uintptr_t)desc->startPath.ptr, desc->startPath.len);
+    nativeDesc.startPath.ptr = oc_wasm_address_to_ptr(desc->startPath.ptr, desc->startPath.len);
     nativeDesc.startPath.len = desc->startPath.len;
 
     u32 eltIndex = desc->filters.list.first;
     while(eltIndex)
     {
-        oc_wasm_str8_elt* elt = oc_runtime_ptr_to_native(orca, (char*)(uintptr_t)eltIndex, sizeof(oc_wasm_str8_elt));
-
-        oc_str8 filter = { 0 };
-        filter.ptr = oc_runtime_ptr_to_native(orca, (char*)(uintptr_t)elt->string.ptr, elt->string.len);
-        filter.len = elt->string.len;
+        oc_wasm_str8_elt* elt = oc_wasm_address_to_ptr(eltIndex, sizeof(oc_wasm_str8_elt));
+        oc_str8 filter = oc_wasm_str8_to_native(elt->string);
 
         oc_str8_list_push(scratch.arena, &nativeDesc.filters, filter);
 
@@ -164,31 +132,12 @@ oc_wasm_file_open_with_dialog_result oc_file_open_with_dialog_bridge(i32 wasmAre
         .file = nativeResult.file
     };
 
-    u32 memSize;
-    char* wasmMemory = (char*)m3_GetMemory(orca->env.m3Runtime, &memSize, 0);
-    oc_wasm_file_open_with_dialog_elt* lastElt = 0;
-
     oc_list_for(&nativeResult.selection, elt, oc_file_open_with_dialog_elt, listElt)
     {
-        oc_wasm_file_open_with_dialog_elt* wasmElt = oc_wasm_arena_push(&orca->env, wasmArenaIndex, sizeof(oc_wasm_file_open_with_dialog_elt));
+        oc_wasm_file_open_with_dialog_elt* wasmElt = oc_wasm_arena_push(wasmArena, sizeof(oc_wasm_file_open_with_dialog_elt));
         wasmElt->file = elt->file;
 
-        if(result.selection.last == 0)
-        {
-            result.selection.first = ((char*)wasmElt - wasmMemory);
-            result.selection.last = result.selection.first;
-            wasmElt->listElt.prev = 0;
-            wasmElt->listElt.next = 0;
-        }
-        else
-        {
-            wasmElt->listElt.prev = result.selection.last;
-            wasmElt->listElt.next = 0;
-            lastElt->listElt.next = ((char*)wasmElt - wasmMemory);
-
-            result.selection.last = ((char*)wasmElt - wasmMemory);
-        }
-        lastElt = wasmElt;
+        oc_wasm_list_push_back(&result.selection, &wasmElt->listElt);
     }
 
     oc_scratch_end(scratch);
diff --git a/src/runtime_memory.c b/src/runtime_memory.c
index 1c0158c..8e5ee43 100644
--- a/src/runtime_memory.c
+++ b/src/runtime_memory.c
@@ -7,10 +7,11 @@
 *****************************************************************/
 
 #include "runtime.h"
+#include "runtime_memory.h"
 
-void* wasm_memory_resize_callback(void* p, unsigned long size, void* userData)
+void* oc_wasm_memory_resize_callback(void* p, unsigned long size, void* userData)
 {
-    wasm_memory* memory = (wasm_memory*)userData;
+    oc_wasm_memory* memory = (oc_wasm_memory*)userData;
 
     if(memory->committed >= size)
     {
@@ -32,35 +33,119 @@ void* wasm_memory_resize_callback(void* p, unsigned long size, void* userData)
     }
 }
 
-void wasm_memory_free_callback(void* p, void* userData)
+void oc_wasm_memory_free_callback(void* p, void* userData)
 {
-    wasm_memory* memory = (wasm_memory*)userData;
+    oc_wasm_memory* memory = (oc_wasm_memory*)userData;
 
     oc_base_allocator* allocator = oc_base_allocator_default();
     oc_base_release(allocator, memory->ptr, memory->reserved);
-    memset(memory, 0, sizeof(wasm_memory));
+    memset(memory, 0, sizeof(oc_wasm_memory));
 }
 
 extern u32 oc_mem_grow(u64 size)
 {
-    oc_runtime_env* runtime = oc_runtime_env_get();
-    wasm_memory* memory = &runtime->wasmMemory;
+    oc_wasm_env* env = oc_runtime_get_env();
+    oc_wasm_memory* memory = &env->wasmMemory;
 
     size = oc_align_up_pow2(size, d_m3MemPageSize);
-    u64 totalSize = size + m3_GetMemorySize(runtime->m3Runtime);
+    u64 totalSize = size + m3_GetMemorySize(env->m3Runtime);
 
     u32 addr = memory->committed;
 
     //NOTE: call resize memory, which will call our custom resize callback... this is a bit involved because
     //      wasm3 doesn't allow resizing the memory directly
-    M3Result res = ResizeMemory(runtime->m3Runtime, totalSize / d_m3MemPageSize);
+    M3Result res = ResizeMemory(env->m3Runtime, totalSize / d_m3MemPageSize);
 
     return (addr);
 }
 
-void* wasm_memory_offset_to_ptr(wasm_memory* memory, u32 offset)
+void* oc_wasm_address_to_ptr(oc_wasm_addr addr, oc_wasm_size size)
 {
-    M3MemoryHeader* header = (M3MemoryHeader*)(memory->ptr);
-    OC_DEBUG_ASSERT(offset < header->length, "Wasm offset exceeds memory length");
-    return memory->ptr + sizeof(M3MemoryHeader) + offset;
+    oc_str8 mem = oc_runtime_get_wasm_memory();
+    OC_ASSERT(addr + size < mem.len, "Object overflows wasm memory");
+
+    void* ptr = (addr == 0) ? 0 : mem.ptr + addr;
+    return (ptr);
+}
+
+oc_wasm_addr oc_wasm_address_from_ptr(void* ptr, oc_wasm_size size)
+{
+    oc_wasm_addr addr = 0;
+    if(ptr != 0)
+    {
+        oc_str8 mem = oc_runtime_get_wasm_memory();
+        OC_ASSERT((char*)ptr > mem.ptr && (((char*)ptr - mem.ptr) + size < mem.len), "Object overflows wasm memory");
+
+        addr = (char*)ptr - mem.ptr;
+    }
+    return (addr);
+}
+
+//------------------------------------------------------------------------------------
+// oc_wasm_list helpers
+//------------------------------------------------------------------------------------
+
+void oc_wasm_list_push(oc_wasm_list* list, oc_wasm_list_elt* elt)
+{
+    elt->next = list->first;
+    elt->prev = 0;
+
+    oc_wasm_addr eltAddr = oc_wasm_address_from_ptr(elt, sizeof(oc_wasm_list_elt));
+
+    if(list->first)
+    {
+        oc_wasm_list_elt* first = oc_wasm_address_to_ptr(list->first, sizeof(oc_wasm_list_elt));
+        first->prev = eltAddr;
+    }
+    else
+    {
+        list->last = eltAddr;
+    }
+    list->first = eltAddr;
+}
+
+void oc_wasm_list_push_back(oc_wasm_list* list, oc_wasm_list_elt* elt)
+{
+    elt->prev = list->last;
+    elt->next = 0;
+
+    oc_wasm_addr eltAddr = oc_wasm_address_from_ptr(elt, sizeof(oc_wasm_list_elt));
+
+    if(list->last)
+    {
+        oc_wasm_list_elt* last = oc_wasm_address_to_ptr(list->last, sizeof(oc_wasm_list_elt));
+        last->next = eltAddr;
+    }
+    else
+    {
+        list->first = eltAddr;
+    }
+    list->last = eltAddr;
+}
+
+//------------------------------------------------------------------------------------
+// Wasm arenas helpers
+//------------------------------------------------------------------------------------
+
+void* oc_wasm_arena_push(oc_wasm_addr arena, u64 size)
+{
+    oc_wasm_env* env = oc_runtime_get_env();
+
+    oc_wasm_addr retValues[1] = { 0 };
+    const void* retPointers[1] = { (void*)&retValues[0] };
+    const void* args[2] = { &arena, &size };
+
+    M3Result res = m3_Call(env->exports[OC_EXPORT_ARENA_PUSH], 2, args);
+    if(res)
+    {
+        ORCA_WASM3_ABORT(env->m3Runtime, res, "Runtime error");
+    }
+
+    res = m3_GetResults(env->exports[OC_EXPORT_ARENA_PUSH], 1, retPointers);
+    if(res)
+    {
+        ORCA_WASM3_ABORT(env->m3Runtime, res, "Runtime error");
+    }
+    void* ptr = oc_wasm_address_to_ptr(retValues[0], size);
+    return (ptr);
 }
diff --git a/src/runtime_memory.h b/src/runtime_memory.h
new file mode 100644
index 0000000..75fbe41
--- /dev/null
+++ b/src/runtime_memory.h
@@ -0,0 +1,101 @@
+/************************************************************/ /**
+*
+*	@file: runtime_memory.h
+*	@author: Martin Fouilleul
+*	@date: 02/09/2023
+*
+*****************************************************************/
+#ifndef __RUNTIME_MEMORY_H_
+#define __RUNTIME_MEMORY_H_
+
+#include "runtime.h"
+
+typedef u32 oc_wasm_addr;
+typedef u32 oc_wasm_size;
+
+void* oc_wasm_address_to_ptr(oc_wasm_addr addr, oc_wasm_size size);
+oc_wasm_addr oc_wasm_address_from_ptr(void* ptr, oc_wasm_size size);
+
+//------------------------------------------------------------------------------------
+// oc_wasm_list helpers
+//------------------------------------------------------------------------------------
+
+typedef struct oc_wasm_list
+{
+    u32 first;
+    u32 last;
+} oc_wasm_list;
+
+typedef struct oc_wasm_list_elt
+{
+    u32 prev;
+    u32 next;
+} oc_wasm_list_elt;
+
+bool oc_wasm_list_empty(oc_wasm_list* list);
+
+#define oc_wasm_list_begin(list) oc_wasm_address_to_ptr(list->first, sizeof(oc_wasm_list_elt))
+#define oc_wasm_list_end(list) oc_wasm_address_to_ptr(list->last, sizeof(oc_wasm_list_elt))
+
+#define oc_wasm_list_next(elt) oc_wasm_address_to_ptr((elt)->next, sizeof(oc_wasm_list_elt))
+#define oc_wasm_list_prev(elt) oc_wasm_address_to_ptr((elt)->prev, sizeof(oc_wasm_list_elt))
+
+#define oc_wasm_list_entry(ptr, type, member) \
+    oc_container_of(ptr, type, member)
+
+#define oc_wasm_list_next_entry(list, elt, type, member) \
+    (((elt)->member.next != 0) ? oc_wasm_list_entry(oc_wasm_list_next((elt)->member), type, member) : 0)
+
+#define oc_wasm_list_prev_entry(list, elt, type, member) \
+    (((elt)->member.prev != 0) ? oc_wasm_list_entry(oc_wasm_list_prev((elt)->member), type, member) : 0)
+
+#define oc_wasm_list_checked_entry(elt, type, member) \
+    (((elt) != 0) ? oc_wasm_list_entry(elt, type, member) : 0)
+
+#define oc_wasm_list_first_entry(list, type, member) \
+    (oc_wasm_list_checked_entry(oc_wasm_list_begin(list), type, member))
+
+#define oc_wasm_list_last_entry(list, type, member) \
+    (oc_wasm_list_checked_entry(oc_wasm_list_last(list), type, member))
+
+#define oc_wasm_list_for(list, elt, type, member)                                       \
+    for(type* elt = oc_wasm_list_checked_entry(oc_wasm_list_begin(list), type, member); \
+        elt != 0;                                                                       \
+        elt = oc_wasm_list_checked_entry(oc_wasm_list_next((elt)->member), type, member))
+
+void oc_wasm_list_push(oc_wasm_list* list, oc_wasm_list_elt* elt);
+void oc_wasm_list_push_back(oc_wasm_list* list, oc_wasm_list_elt* elt);
+
+//------------------------------------------------------------------------------------
+// oc_wasm_str8 helpers
+//------------------------------------------------------------------------------------
+
+typedef struct oc_wasm_str8
+{
+    u64 len;
+    u32 ptr;
+} oc_wasm_str8;
+
+typedef struct oc_wasm_str8_elt
+{
+    oc_wasm_list_elt listElt;
+    oc_wasm_str8 string;
+
+} oc_wasm_str8_elt;
+
+typedef struct oc_wasm_str8_list
+{
+    oc_wasm_list list;
+    u64 eltCount;
+    u64 len;
+} oc_wasm_str8_list;
+
+#define oc_wasm_str8_to_native(wasmString) ((oc_str8){ .ptr = oc_wasm_address_to_ptr(wasmString.ptr, wasmString.len), .len = wasmString.len })
+
+//------------------------------------------------------------------------------------
+// Wasm arenas helpers
+//------------------------------------------------------------------------------------
+
+void* oc_wasm_arena_push(oc_wasm_addr arena, u64 size);
+
+#endif //__RUNTIME_MEMORY_H_
diff --git a/src/wasmbind/core_api.json b/src/wasmbind/core_api.json
index 7cc1a5f..8d43000 100644
--- a/src/wasmbind/core_api.json
+++ b/src/wasmbind/core_api.json
@@ -1,7 +1,7 @@
 [
 {
-	"name": "oc_runtime_log",
-	"cname": "oc_runtime_log",
+	"name": "oc_bridge_log",
+	"cname": "oc_bridge_log",
 	"ret": {"name": "void", "tag": "v"},
 	"args": [ {"name": "level",
 			   "type": {"name": "oc_log_level", "tag": "i"}},
@@ -29,7 +29,7 @@
 			   "type": {"name": "u64", "tag": "I"}}]
 },
 {
-	"name": "oc_runtime_assert_fail",
+	"name": "oc_bridge_assert_fail",
 	"cname": "oc_assert_fail",
 	"ret": {"name": "void", "tag": "v"},
 	"args": [ {"name": "file",
@@ -45,7 +45,7 @@
 			]
 },
 {
-	"name": "oc_runtime_abort_ext",
+	"name": "oc_bridge_abort_ext",
 	"cname": "oc_abort_ext",
 	"ret": {"name": "void", "tag": "v"},
 	"args": [ {"name": "file",
@@ -71,17 +71,17 @@
 	"args": []
 },
 {
-	"name": "oc_runtime_window_set_title",
-	"cname": "oc_runtime_window_set_title",
+	"name": "oc_window_set_title",
+	"cname": "oc_bridge_window_set_title",
 	"ret": {"name": "void", "tag": "v"},
 	"args": [
 		{ "name": "title",
-		  "type": {"name": "oc_str8", "tag": "S"}}
+		  "type": {"name": "oc_str8", "cname": "oc_wasm_str8", "tag": "S"}}
 	]
 },
 {
-	"name": "oc_runtime_window_set_size",
-	"cname": "oc_runtime_window_set_size",
+	"name": "oc_window_set_size",
+	"cname": "oc_bridge_window_set_size",
 	"ret": {"name": "void", "tag": "v"},
 	"args": [
 		{ "name": "size",
diff --git a/src/wasmbind/io_api.json b/src/wasmbind/io_api.json
index b164b37..5f720f3 100644
--- a/src/wasmbind/io_api.json
+++ b/src/wasmbind/io_api.json
@@ -1,7 +1,7 @@
 [
 {
 	"name": "oc_io_wait_single_req",
-	"cname": "oc_runtime_io_wait_single_req",
+	"cname": "oc_bridge_io_single_rect",
 	"ret": {"name": "oc_io_cmp", "tag": "S"},
 	"args": [ {"name": "req",
 	           "type": {"name": "oc_io_req*", "tag": "p"}}]
@@ -12,7 +12,7 @@
     "ret": {"name": "oc_file", "tag": "S"},
     "args": [
         {"name": "path",
-         "type": {"name": "oc_str8", "tag": "S"}},
+         "type": {"name": "oc_str8", "cname": "oc_wasm_str8", "tag": "S"}},
         {"name": "rights",
          "type": {"name": "oc_file_access", "tag": "i"}},
         {"name": "flags",