core/config.h: Bump the default WASM_STACK_GUARD_SIZE (bytecodealliance#3344)

The old value (1KB) doesn't seem sufficient for many cases.

I suspect that the new value is still not sufficient for some cases.
But it's far safer than the old value.
Consider if the classic interpreter loop (2600 bytes) calls
host snprintf. (2000 bytes)

Fixes: bytecodealliance#3314

Author: yamt

core/config.h

@@ -486,7 +486,26 @@
 /* UVWASI requires larger native stack */
 #define WASM_STACK_GUARD_SIZE (4096 * 6)
 #else
-#define WASM_STACK_GUARD_SIZE (1024)
+/*
+ * Use a larger default for platforms like macOS/Linux.
+ *
+ * For example, wasm_interp_call_func_bytecode + wasm_runtime_set_exception
+ * would consume >4KB stack on x86-64 macOS.
+ *
+ * Although product-mini/platforms/nuttx always overrides
+ * WASM_STACK_GUARD_SIZE, exclude NuttX here just in case.
+ */
+#if defined(__APPLE__) || (defined(__unix__) && !defined(__NuttX__))
+#define WASM_STACK_GUARD_SIZE (1024 * 5)
+#else
+/*
+ * Otherwise, assume very small requirement for now.
+ *
+ * Embedders for very small devices likely fine-tune WASM_STACK_GUARD_SIZE
+ * for their specific applications anyway.
+ */
+#define WASM_STACK_GUARD_SIZE 1024
+#endif
 #endif
 #endif