Compress snapshots using a simple, extensible 1D-compression.

Typically reduces storage overhead for snapshot maps by 60%.
The extensible format is a prerequisite for the next redesign steps:
Eliminate IR_FRAME and implement return-to-lower-frame.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/lj_snap.h b/src/lj_snap.h
index 776a0bcf..ed7d98a1 100644
--- a/src/lj_snap.h
+++ b/src/lj_snap.h
@@ -14,6 +14,19 @@ LJ_FUNC void lj_snap_add(jit_State *J);
 LJ_FUNC void lj_snap_shrink(jit_State *J);
 LJ_FUNC void lj_snap_regspmap(uint16_t *rsmap, Trace *T, SnapNo snapno);
 LJ_FUNC void lj_snap_restore(jit_State *J, void *exptr);
+LJ_FUNC void lj_snap_grow_buf_(jit_State *J, MSize need);
+LJ_FUNC void lj_snap_grow_map_(jit_State *J, MSize need);
+
+static LJ_AINLINE void lj_snap_grow_buf(jit_State *J, MSize need)
+{
+  if (LJ_UNLIKELY(need > J->sizesnap)) lj_snap_grow_buf_(J, need);
+}
+
+static LJ_AINLINE void lj_snap_grow_map(jit_State *J, MSize need)
+{
+  if (LJ_UNLIKELY(need > J->sizesnapmap)) lj_snap_grow_map_(J, need);
+}
+
 #endif
 
 #endif