Changeset 04570c7 for src/Common/GC.h

Timestamp:

Apr 13, 2018, 4:39:28 PM (6 years ago)

Author:

Aaron Moss <a3moss@…>

Branches:

new-env, with_gc

Children:

6f81db3

Parents:

3205495

git-author:

Aaron Moss <a3moss@…> (04/13/18 16:27:11)

git-committer:

Aaron Moss <a3moss@…> (04/13/18 16:39:28)

Message:

First draft of arbitrarily-generational GC

File:

• src/Common/GC.h (modified) (3 diffs)

src/Common/GC.h

@@ -38 +38 @@
         void register_static_root(BaseSyntaxNode*);
 
-        /// Use young generation for subsequent new objects
+        /// Start new generation for subsequent new objects
         void new_generation();
 
@@ -44 +44 @@
         void trace_static_roots();
 
-        /// Collects the young generation, placing survivors in old generation.
-        /// Old generation is used for subsequent new objects.
+        /// Collects the youngest generation, placing survivors in previous generation.
+        /// Young generation objects cannot be kept alive by pointers from older generation.
+        /// Older generation is used for subsequent new objects.
         void collect_young();
 
-        /// Collects old generation; use old generation afterward.
-        /// Error if currently using young generation
+        /// Collects oldest generation; use oldest generation afterward.
+        /// Error if currently using younger generation
         void collect();
 
@@ -58 +59 @@
         GC();
 
-        bool mark;                 ///< The current collection's mark bit
-        bool using_young;          ///< Is the young generation in use?
-
         using Generation = std::vector<GC_Object*>;
-        Generation old;            ///< Old generation
-        Generation young;          ///< Young generation
+        std::vector<Generation> gens;  ///< Set of generations; always at least one
 
         using StaticRoots = std::vector<BaseSyntaxNode*>;
-        StaticRoots static_roots;  ///< Set of static-lifetime roots
+        StaticRoots static_roots;      ///< Set of static-lifetime roots
+
+        bool mark;                     ///< The current collection's mark bit
+        unsigned g;                    ///< The current number generation in use
 };