1 files changed, 10 insertions, 8 deletions

diff --git a/src/lj_debug.c b/src/lj_debug.c
index 2f2ea9f0..c1f0f314 100644
--- a/src/lj_debug.c
+++ b/src/lj_debug.c
@@ -55,7 +55,8 @@ static BCPos debug_framepc(lua_State *L, GCfunc *fn, cTValue *nextframe)
   const BCIns *ins;
   GCproto *pt;
   BCPos pos;
-  lua_assert(fn->c.gct == ~LJ_TFUNC || fn->c.gct == ~LJ_TTHREAD);
+  lj_assertL(fn->c.gct == ~LJ_TFUNC || fn->c.gct == ~LJ_TTHREAD,
+             "function or frame expected");
   if (!isluafunc(fn)) {  /* Cannot derive a PC for non-Lua functions. */
     return NO_BCPOS;
   } else if (nextframe == NULL) {  /* Lua function on top. */
@@ -100,7 +101,7 @@ static BCPos debug_framepc(lua_State *L, GCfunc *fn, cTValue *nextframe)
 #if LJ_HASJIT
   if (pos > pt->sizebc) {  /* Undo the effects of lj_trace_exit for JLOOP. */
     GCtrace *T = (GCtrace *)((char *)(ins-1) - offsetof(GCtrace, startins));
-    lua_assert(bc_isret(bc_op(ins[-1])));
+    lj_assertL(bc_isret(bc_op(ins[-1])), "return bytecode expected");
     pos = proto_bcpos(pt, mref(T->startpc, const BCIns));
   }
 #endif
@@ -133,7 +134,7 @@ static BCLine debug_frameline(lua_State *L, GCfunc *fn, cTValue *nextframe)
   BCPos pc = debug_framepc(L, fn, nextframe);
   if (pc != NO_BCPOS) {
     GCproto *pt = funcproto(fn);
-    lua_assert(pc <= pt->sizebc);
+    lj_assertL(pc <= pt->sizebc, "PC out of range");
     return lj_debug_line(pt, pc);
   }
   return -1;
@@ -214,7 +215,7 @@ static TValue *debug_localname(lua_State *L, const lua_Debug *ar,
 const char *lj_debug_uvname(GCproto *pt, uint32_t idx)
 {
   const uint8_t *p = proto_uvinfo(pt);
-  lua_assert(idx < pt->sizeuv);
+  lj_assertX(idx < pt->sizeuv, "bad upvalue index");
   if (!p) return "";
   if (idx) while (*p++ || --idx) ;
   return (const char *)p;
@@ -439,13 +440,14 @@ int lj_debug_getinfo(lua_State *L, const char *what, lj_Debug *ar, int ext)
   } else {
     uint32_t offset = (uint32_t)ar->i_ci & 0xffff;
     uint32_t size = (uint32_t)ar->i_ci >> 16;
-    lua_assert(offset != 0);
+    lj_assertL(offset != 0, "bad frame offset");
     frame = tvref(L->stack) + offset;
     if (size) nextframe = frame + size;
-    lua_assert(frame <= tvref(L->maxstack) &&
-               (!nextframe || nextframe <= tvref(L->maxstack)));
+    lj_assertL(frame <= tvref(L->maxstack) &&
+               (!nextframe || nextframe <= tvref(L->maxstack)),
+               "broken frame chain");
     fn = frame_func(frame);
-    lua_assert(fn->c.gct == ~LJ_TFUNC);
+    lj_assertL(fn->c.gct == ~LJ_TFUNC, "bad frame function");
   }
   for (; *what; what++) {
     if (*what == 'S') {