README.md

@@ -37,6 +37,8 @@ Please see https://pocketpy.dev for details and try the following resources.
 pkpy should work on any platform with a C11 compiler.
 These platforms are officially tested.
 
+> C99 compilers may also work currently according to users' feedback.
+
 + Windows 64-bit
 + Linux 64-bit / 32-bit
 + macOS 64-bit

build.sh

@@ -16,11 +16,10 @@ if [ $? -ne 0 ]; then
 fi
 
 SRC=$(find src/ -name "*.c")
-SRC2=${1:-src2/main.c}
 
 echo "> Compiling and linking source files... "
 
-clang -std=c11 -O2 -Wfatal-errors -Iinclude -DNDEBUG -o main $SRC $SRC2 -lm -ldl
+clang -std=c11 -O2 -Wfatal-errors -Iinclude -DNDEBUG -o main src2/main.c $SRC -lm -ldl
 
 if [ $? -eq 0 ]; then
     echo "Build completed. Type \"./main\" to enter REPL."

build_g.sh

@@ -12,8 +12,6 @@ if [ "$(uname)" == "Darwin" ]; then
     SANITIZE_FLAGS="-fsanitize=address,undefined"
 fi
 
-SRC2=${1:-src2/main.c}
-
 echo "Compiling C files..."
-clang $FLAGS $SANITIZE_FLAGS $SRC $SRC2 -o main
+clang $FLAGS $SANITIZE_FLAGS $SRC src2/main.c -o main
 

docs/index.md

@@ -34,6 +34,8 @@ print(primes)
 pkpy should work on any platform with a C11 compiler.
 These platforms are officially tested.
 
+> C99 compilers may also work currently according to users' feedback.
+
 + Windows 64-bit
 + Linux 64-bit / 32-bit
 + macOS 64-bit

include/pocketpy/config.h

@@ -7,6 +7,12 @@
 #define PK_VERSION_PATCH            8
 
 /*************** feature settings ***************/
+
+// Reduce the startup memory usage for embedded systems
+#ifndef PK_LOW_MEMORY_MODE          // can be overridden by cmake
+#define PK_LOW_MEMORY_MODE          0
+#endif
+
 // Whether to compile os-related modules or not
 #ifndef PK_ENABLE_OS                // can be overridden by cmake
 #define PK_ENABLE_OS                1
@@ -14,8 +20,12 @@
 
 // GC min threshold
 #ifndef PK_GC_MIN_THRESHOLD         // can be overridden by cmake
+    #if PK_LOW_MEMORY_MODE
+        #define PK_GC_MIN_THRESHOLD     2048
+    #else
         #define PK_GC_MIN_THRESHOLD     32768
     #endif
+#endif
 
 // Memory allocation functions
 #ifndef PK_MALLOC
@@ -27,8 +37,12 @@
 // This is the maximum size of the value stack in py_TValue units
 // The actual size in bytes equals `sizeof(py_TValue) * PK_VM_STACK_SIZE`
 #ifndef PK_VM_STACK_SIZE            // can be overridden by cmake
+    #if PK_LOW_MEMORY_MODE
+        #define PK_VM_STACK_SIZE    2048
+    #else
         #define PK_VM_STACK_SIZE    16384
     #endif
+#endif
 
 // This is the maximum number of local variables in a function
 // (not recommended to change this)

include/pocketpy/objects/base.h

@@ -4,7 +4,7 @@
 
 typedef struct PyObject PyObject;
 typedef struct VM VM;
-extern _Thread_local VM* pk_current_vm;
+extern VM* pk_current_vm;
 
 typedef struct py_TValue {
     py_Type type;

src/interpreter/heap.c

@@ -81,7 +81,7 @@ PyObject* ManagedHeap__gcnew(ManagedHeap* self, py_Type type, int slots, int uds
     PyObject* obj;
     // header + slots + udsize
     int size = sizeof(PyObject) + PK_OBJ_SLOTS_SIZE(slots) + udsize;
-    if(size <= kPoolMaxBlockSize) {
+    if(!PK_LOW_MEMORY_MODE && size <= kPoolMaxBlockSize) {
         obj = MultiPool__alloc(&self->small_objects, size);
         assert(obj != NULL);
     } else {

src/modules/array2d.c

@@ -909,10 +909,7 @@ static py_TValue* c11_chunked_array2d__new_chunk(c11_chunked_array2d* self, c11_
     if(!py_isnone(&self->context_builder)) {
         py_newvec2i(&data[0], pos);
         bool ok = py_call(&self->context_builder, 1, &data[0]);
-        if(!ok) {
-            PK_FREE(data);
-            return NULL;
-        }
+        if(!ok) return NULL;
         data[0] = *py_retval();
     } else {
         data[0] = *py_None();
@@ -1106,7 +1103,6 @@ static bool chunked_array2d__len__(int argc, py_Ref argv) {
 static bool chunked_array2d_clear(int argc, py_Ref argv) {
     PY_CHECK_ARGC(1);
     c11_chunked_array2d* self = py_touserdata(argv);
-    c11__foreach(c11_chunked_array2d_chunks_KV, &self->chunks, p_kv) PK_FREE(p_kv->value);
     c11_chunked_array2d_chunks__clear(&self->chunks);
     self->last_visited.value = NULL;
     py_newnone(py_retval());
@@ -1170,16 +1166,9 @@ static bool chunked_array2d_remove_chunk(int argc, py_Ref argv) {
     PY_CHECK_ARG_TYPE(1, tp_vec2i);
     c11_chunked_array2d* self = py_touserdata(argv);
     c11_vec2i pos = py_tovec2i(&argv[1]);
-    py_TValue* data = c11_chunked_array2d_chunks__get(&self->chunks, pos, NULL);
-    if(data != NULL) {
-        PK_FREE(data);
     bool ok = c11_chunked_array2d_chunks__del(&self->chunks, pos);
-        assert(ok);
     self->last_visited.value = NULL;
     py_newbool(py_retval(), ok);
-    } else {
-        py_newbool(py_retval(), false);
-    }
     return true;
 }
 

src/public/internal.c

@@ -5,15 +5,14 @@
 #include "pocketpy/common/utils.h"
 #include "pocketpy/interpreter/vm.h"
 
-_Thread_local VM* pk_current_vm;
+VM* pk_current_vm;
 
-static bool pk_initialized;
 static VM pk_default_vm;
 static VM* pk_all_vm[16];
 static py_TValue _True, _False, _None, _NIL;
 
 void py_initialize() {
-    if(pk_initialized) {
+    if(pk_current_vm) {
         // c11__abort("py_initialize() can only be called once!");
         return;
     }
@@ -36,8 +35,6 @@ void py_initialize() {
     py_newnone(&_None);
     py_newnil(&_NIL);
     VM__ctor(&pk_default_vm);
-
-    pk_initialized = true;
 }
 
 py_GlobalRef py_True() { return &_True; }