Berry ``debug.gcdebug()`` to enable GC debugging (#19936)

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes to this project will be documented in this file.
 ## [13.2.0.2]
 ### Added
 - Scripter TCP client (#19914)
+- Berry ``debug.gcdebug()`` to enable GC debugging
 
 ### Breaking Changed
 

lib/libesp32/berry/src/be_debuglib.c

@@ -84,6 +84,19 @@ static int m_codedump(bvm *vm)
     be_return_nil(vm);
 }
 
+static int m_gcdebug(bvm *vm) {
+    int argc = be_top(vm);
+    if (argc >= 1 && be_isbool(vm, 1)) {
+        if (be_tobool(vm, 1)) {
+            comp_set_gc_debug(vm);
+        } else {
+            comp_clear_gc_debug(vm);
+        }
+    }
+    be_pushbool(vm, comp_is_gc_debug(vm));
+    be_return(vm);
+}
+
 static int m_traceback(bvm *vm)
 {
     be_tracestack(vm);
@@ -223,6 +236,7 @@ be_native_module_attr_table(debug) {
     be_native_module_function("varname", m_varname),
     be_native_module_function("upvname", m_upvname)
 #endif
+    be_native_module_function("gcdebug", m_gcdebug)
 };
 
 be_define_native_module(debug, NULL);
@@ -242,6 +256,8 @@ module debug (scope: global, depend: BE_USE_DEBUG_MODULE) {
     allocs, func(m_allocs)
     frees, func(m_frees)
     reallocs, func(m_reallocs)
+    // GC debug mode
+    gcdebug, func(m_gcdebug)
 }
 @const_object_info_end */
 #include "../generate/be_fixed_debug.h"

lib/libesp32/berry/src/be_gc.c

@@ -545,15 +545,9 @@ static void reset_fixedlist(bvm *vm)
 
 void be_gc_auto(bvm *vm)
 {
-#if BE_USE_DEBUG_GC
-    if (vm->gc.status & GC_PAUSE) { /* force gc each time it's possible */
+    if (vm->gc.status & GC_PAUSE && (BE_USE_DEBUG_GC || vm->gc.usage > vm->gc.threshold || comp_is_gc_debug(vm))) {
         be_gc_collect(vm);
     }
-#else
-    if (vm->gc.status & GC_PAUSE && vm->gc.usage > vm->gc.threshold) {
-        be_gc_collect(vm);
-    }
-#endif
 }
 
 size_t be_gc_memcount(bvm *vm)

lib/libesp32/berry/src/be_mem.c

@@ -73,9 +73,9 @@ BERRY_API void* be_realloc(bvm *vm, void *ptr, size_t old_size, size_t new_size)
             vm->counter_mem_free++;
 #endif
             if (ptr == NULL) { return NULL; }   /* safeguard */
-#if BE_USE_DEBUG_GC
+            if (BE_USE_DEBUG_GC || comp_is_gc_debug(vm)) {
                 memset(ptr, 0xFF, old_size); /* fill the structure with invalid pointers */
-#endif
+            }
             free_from_pool(vm, ptr, old_size);
             break;    /* early exit */
         }

lib/libesp32/berry/src/be_string.c

@@ -268,13 +268,13 @@ void be_gcstrtab(bvm *vm)
             }
         }
     }
-#if BE_USE_DEBUG_GC == 0
+    if (BE_USE_DEBUG_GC || comp_is_gc_debug(vm)) {
+        resize(vm, tab->count + 4);
+    } else {
         if (tab->count < size >> 2 && size > 8) {
             resize(vm, size >> 1);
         }
-#else
-    resize(vm, tab->count + 4);
-#endif
+    }
 }
 
 uint32_t be_strhash(const bstring *s)

lib/libesp32/berry/src/be_vm.h

@@ -18,10 +18,15 @@
 #define comp_set_strict(vm)         ((vm)->compopt |= (1<<COMP_STRICT))
 #define comp_clear_strict(vm)       ((vm)->compopt &= ~(1<<COMP_STRICT))
 
+#define comp_is_gc_debug(vm)       ((vm)->compopt & (1<<COMP_GC_DEBUG))
+#define comp_set_gc_debug(vm)      ((vm)->compopt |= (1<<COMP_GC_DEBUG))
+#define comp_clear_gc_debug(vm)    ((vm)->compopt &= ~(1<<COMP_GC_DEBUG))
+
 /* Compilation options */
 typedef enum {
     COMP_NAMED_GBL = 0x00,  /* compile with named globals */
     COMP_STRICT = 0x01,     /* compile with named globals */
+    COMP_GC_DEBUG = 0x02,   /* compile with gc debug */
 } compoptmask;
 
 typedef struct {