micropython · dpgeorge · Aug 14, 2025 · Aug 10, 2025 · Aug 10, 2025 · Aug 11, 2025
diff --git a/.github/workflows/ports_webassembly.yml b/.github/workflows/ports_webassembly.yml
@@ -11,6 +11,7 @@ on:
       - 'shared/**'
       - 'lib/**'
       - 'ports/webassembly/**'
+      - 'tests/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}

diff --git a/.github/workflows/ports_zephyr.yml b/.github/workflows/ports_zephyr.yml
@@ -11,6 +11,7 @@ on:
       - 'shared/**'
       - 'lib/**'
       - 'ports/zephyr/**'
+      - 'tests/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}

diff --git a/ports/webassembly/main.c b/ports/webassembly/main.c
@@ -49,6 +49,9 @@
 // the top-level call into C.
 static size_t external_call_depth = 0;
 
+// Emscripten defaults to a 64k C-stack, so our limit should be less than that.
+#define CSTACK_SIZE (32 * 1024)
+
 #if MICROPY_GC_SPLIT_HEAP_AUTO
 static void gc_collect_top_level(void);
 #endif
@@ -67,6 +70,8 @@ void external_call_depth_dec(void) {
 }
 
 void mp_js_init(int pystack_size, int heap_size) {
+    mp_cstack_init_with_sp_here(CSTACK_SIZE);
+
     #if MICROPY_ENABLE_PYSTACK
     mp_obj_t *pystack = (mp_obj_t *)malloc(pystack_size * sizeof(mp_obj_t));
     mp_pystack_init(pystack, pystack + pystack_size);

diff --git a/ports/webassembly/mpconfigport.h b/ports/webassembly/mpconfigport.h
@@ -44,7 +44,6 @@
 #define MICROPY_READER_VFS          (MICROPY_VFS)
 #define MICROPY_ENABLE_GC           (1)
 #define MICROPY_ENABLE_PYSTACK      (1)
-#define MICROPY_STACK_CHECK         (0)
 #define MICROPY_KBD_EXCEPTION       (1)
 #define MICROPY_REPL_EVENT_DRIVEN   (1)
 #define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)

diff --git a/tests/basics/io_buffered_writer.py b/tests/basics/io_buffered_writer.py
@@ -1,9 +1,9 @@
-import io
-
 try:
+    import io
+
     io.BytesIO
     io.BufferedWriter
-except AttributeError:
+except (AttributeError, ImportError):
     print('SKIP')
     raise SystemExit
 

diff --git a/tests/basics/io_bytesio_cow.py b/tests/basics/io_bytesio_cow.py
@@ -1,6 +1,12 @@
 # Make sure that write operations on io.BytesIO don't
 # change original object it was constructed from.
-import io
+
+try:
+    import io
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
 b = b"foobar"
 
 a = io.BytesIO(b)

diff --git a/tests/basics/io_bytesio_ext.py b/tests/basics/io_bytesio_ext.py
@@ -1,5 +1,11 @@
 # Extended stream operations on io.BytesIO
-import io
+
+try:
+    import io
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
 a = io.BytesIO(b"foobar")
 a.seek(10)
 print(a.read(10))

diff --git a/tests/basics/io_bytesio_ext2.py b/tests/basics/io_bytesio_ext2.py
@@ -1,4 +1,9 @@
-import io
+try:
+    import io
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
 a = io.BytesIO(b"foobar")
 try:
     a.seek(-10)

diff --git a/tests/basics/io_iobase.py b/tests/basics/io_iobase.py
@@ -1,8 +1,9 @@
-import io
 try:
+    import io
+
     io.IOBase
-except AttributeError:
-    print('SKIP')
+except (AttributeError, ImportError):
+    print("SKIP")
     raise SystemExit
 
 

diff --git a/tests/basics/io_stringio1.py b/tests/basics/io_stringio1.py
@@ -1,4 +1,9 @@
-import io
+try:
+    import io
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
 a = io.StringIO()
 print('io.StringIO' in repr(a))
 print(a.getvalue())

diff --git a/tests/basics/io_stringio_base.py b/tests/basics/io_stringio_base.py
@@ -1,7 +1,11 @@
 # Checks that an instance type inheriting from a native base that uses
 # MP_TYPE_FLAG_ITER_IS_STREAM will still have a getiter.
 
-import io
+try:
+    import io
+except ImportError:
+    print("SKIP")
+    raise SystemExit
 
 a = io.StringIO()
 a.write("hello\nworld\nmicro\npython\n")

diff --git a/tests/basics/io_stringio_with.py b/tests/basics/io_stringio_with.py
@@ -1,4 +1,9 @@
-import io
+try:
+    import io
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
 # test __enter__/__exit__
 with io.StringIO() as b:
     b.write("foo")

diff --git a/tests/basics/io_write_ext.py b/tests/basics/io_write_ext.py
@@ -1,10 +1,11 @@
 # This tests extended (MicroPython-specific) form of write:
 # write(buf, len) and write(buf, offset, len)
-import io
 
 try:
+    import io
+
     io.BytesIO
-except AttributeError:
+except (AttributeError, ImportError):
     print('SKIP')
     raise SystemExit
 

diff --git a/tests/feature_check/float.py b/tests/feature_check/float.py
diff --git a/tests/feature_check/float.py.exp b/tests/feature_check/float.py.exp
diff --git a/tests/feature_check/io_module.py b/tests/feature_check/io_module.py
diff --git a/tests/feature_check/io_module.py.exp b/tests/feature_check/io_module.py.exp
diff --git a/tests/feature_check/target_info.py b/tests/feature_check/target_info.py
@@ -22,4 +22,15 @@
 ][sys_mpy >> 10]
 thread = getattr(sys.implementation, "_thread", None)
 
-print(platform, arch, thread)
+# Detect how many bits of precision the floating point implementation has.
+try:
+    if float("1.0000001") == float("1.0"):
+        float_prec = 30
+    elif float("1e300") == float("inf"):
+        float_prec = 32
+    else:
+        float_prec = 64
+except NameError:
+    float_prec = 0
+
+print(platform, arch, thread, float_prec, len("α") == 1)