From 38e4c37f0f991122530a708148a6ec0e2a5a3eff Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Fri, 12 Aug 2022 18:22:49 -0700
Subject: Chapter 26.6

---
 clox/src/memory.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'clox/src/memory.c')

diff --git a/clox/src/memory.c b/clox/src/memory.c
index c639b65..d1e0c5a 100644
--- a/clox/src/memory.c
+++ b/clox/src/memory.c
@@ -9,13 +9,20 @@
 #include <stdio.h>
 #endif
 
+#define GC_HEAP_GROW_FACTOR 2
+
 void *reallocate(void *pointer, size_t oldSize, size_t newSize) {
+  vm.bytesAllocated += newSize - oldSize;
   if (newSize > oldSize) {
 #ifdef DEBUG_STRESS_GC
     collectGarbage();
 #endif
   }
 
+  if (vm.bytesAllocated > vm.nextGC) {
+    collectGarbage();
+  }
+
   if (newSize == 0) {
     free(pointer);
     return NULL;
@@ -175,6 +182,7 @@ static void sweep() {
 void collectGarbage() {
 #ifdef DEBUG_LOG_GC
   printf("-- gc begin\n");
+  size_t before = vm.bytesAllocated;
 #endif
 
   markRoots();
@@ -182,8 +190,12 @@ void collectGarbage() {
   tableRemoveWhite(&vm.strings);
   sweep();
 
+  vm.nextGC = vm.bytesAllocated * GC_HEAP_GROW_FACTOR;
+
 #ifdef DEBUG_LOG_GC
-  printf("-- gd end\n");
+  printf("-- gc end\n");
+  printf("   collected %zu bytes (from %zu to %zu) next at %zu\n",
+         before - vm.bytesAllocated, before, vm.bytesAllocated, vm.nextGC);
 #endif
 }
 
-- 
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