Eliminate redundant stack checks. Add checks for growing root traces.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/lj_jit.h b/src/lj_jit.h
index a43611de..41a3fe9a 100644
--- a/src/lj_jit.h
+++ b/src/lj_jit.h
@@ -169,6 +169,10 @@ typedef struct Trace {
   TraceNo1 nextside;    /* Next side trace of same root trace. */
   uint16_t nchild;      /* Number of child traces (root trace only). */
   uint16_t spadjust;    /* Stack pointer adjustment (offset in bytes). */
+  uint8_t topslot;      /* Top stack slot already checked to be allocated. */
+  uint8_t unused1;
+  uint8_t unused2;
+  uint8_t unused3;
 #ifdef LUAJIT_USE_GDBJIT
   void *gdbjit_entry;   /* GDB JIT entry. */
 #endif
@@ -227,9 +231,9 @@ typedef struct jit_State {
 
   TraceState state;     /* Trace compiler state. */
 
+  uint64_t tailcalled;  /* History of the number of successive tailcalls. */
   int32_t instunroll;   /* Unroll counter for instable loops. */
   int32_t loopunroll;   /* Unroll counter for loop ops in side traces. */
-  uint64_t tailcalled;  /* History of the number of successive tailcalls. */
   int32_t framedepth;   /* Current frame depth. */
   int32_t retdepth;     /* Return frame depth (count of RETF). */