removed some depth check

lib/hawk-prv.h

@@ -69,10 +69,12 @@ typedef struct hawk_tree_t hawk_tree_t;
 #define HAWK_ENABLE_ATOMIC_SIG
 #endif
 
+/*
 #if defined(HAVE_UCONTEXT_H)
 #include <ucontext.h>
 #define HAWK_ENABLE_UCONTEXT
 #endif
+*/
 
 /* Use iterative (heap-stack) expression evaluation instead of C recursion.
  * eval_expression, eval_expression0, and hawk_rtx_evalcall automatically
@@ -473,7 +475,10 @@ enum hawk_ef_state_t
 	HAWK_EF_LAND_LEFT,      /* logical AND: awaiting left result */
 	HAWK_EF_LAND_RIGHT,     /* logical AND: left done and true (val=left), awaiting right */
 	HAWK_EF_LOR_LEFT,       /* logical OR: awaiting left result */
-	HAWK_EF_LOR_RIGHT       /* logical OR: left done and false (val=left), awaiting right */
+	HAWK_EF_LOR_RIGHT,      /* logical OR: left done and false (val=left), awaiting right */
+#if defined(HAWK_ENABLE_XSTACK_EVAL)
+	HAWK_EF_FNCALL_FUN_AWAIT /* user fn body executing on exec_stack; aux=exec_body_base */
+#endif
 };
 typedef enum hawk_ef_state_t hawk_ef_state_t;
 
@@ -482,9 +487,24 @@ struct hawk_eframe_t
 	hawk_ef_state_t state;
 	hawk_nde_t*     nde;  /* composite node being processed */
 	hawk_val_t*     val;  /* intermediate value (refcount incremented) */
+	hawk_oow_t      aux;  /* FNCALL_FUN_AWAIT: exec_stack size when body frames were pushed */
 };
 typedef struct hawk_eframe_t hawk_eframe_t;
 
+#if defined(HAWK_ENABLE_XSTACK_EVAL)
+/* call frame: saves context for a user-defined function call made from within
+ * expression evaluation. stored in the call_stack. */
+struct hawk_call_frame_t
+{
+	hawk_nde_fncall_t* call;            /* call-site node */
+	hawk_fun_t*        fun;             /* resolved function */
+	hawk_oow_t         saved_stack_top; /* rtx->stack_top before the call */
+	hawk_oow_t         saved_stack_base;/* rtx->stack_base before the call */
+	hawk_oow_t         nargs;           /* actual argument count pushed */
+};
+typedef struct hawk_call_frame_t hawk_call_frame_t;
+#endif
+
 struct hawk_rtx_t
 {
 	HAWK_RTX_HDR;
@@ -509,6 +529,15 @@ struct hawk_rtx_t
 	hawk_oow_t eframe_stack_size;
 	hawk_oow_t eframe_stack_limit;
 
+#if defined(HAWK_ENABLE_XSTACK_EVAL)
+	/* heap-based call frame stack: user-defined function calls from eframe evaluation */
+	hawk_call_frame_t* call_stack;
+	hawk_oow_t call_stack_size;
+	hawk_oow_t call_stack_limit;
+	/* result register: eframe eval result delivered to exec AFTER_EVAL frames */
+	hawk_val_t* driver_eval_result;
+#endif
+
 #if defined(HAVE_UCONTEXT_H)
 	/* pool of reusable C stacks for coroutine-based function calls */
 	struct

lib/hawk.h

@@ -1922,12 +1922,14 @@ static HAWK_INLINE void hawk_geterruinf (hawk_t* hawk, hawk_erruinf_t* errinf) {
  * it automatically formatted.
  */
 #if defined(HAWK_HAVE_INLINE)
+static HAWK_INLINE void hawk_clrerror (hawk_t* hawk) { hawk_gem_seterrnum(hawk_getgem(hawk), HAWK_NULL, HAWK_ENOERR); }
 static HAWK_INLINE void hawk_seterrnum (hawk_t* hawk, const hawk_loc_t* errloc, hawk_errnum_t errnum) { hawk_gem_seterrnum(hawk_getgem(hawk), errloc, errnum); }
 static HAWK_INLINE void hawk_seterrinf (hawk_t* hawk, const hawk_errinf_t* errinf) { hawk_gem_seterrinf(hawk_getgem(hawk), errinf); }
 static HAWK_INLINE void hawk_seterror (hawk_t* hawk, const hawk_loc_t*  errloc, hawk_errnum_t errnum, const hawk_oocs_t* errarg) { hawk_gem_seterror(hawk_getgem(hawk), errloc, errnum, errarg); }
 static HAWK_INLINE const hawk_ooch_t* hawk_backuperrmsg (hawk_t* hawk) { return hawk_gem_backuperrmsg(hawk_getgem(hawk)); }
 static HAWK_INLINE void hawk_geterror (hawk_t* hawk, hawk_errnum_t* errnum, const hawk_ooch_t** errmsg, hawk_loc_t* errloc) { return hawk_gem_geterror(hawk_getgem(hawk), errnum, errmsg, errloc); }
 #else
+#define hawk_clrerror(hawk) hawk_gem_seterrnum(hawk_getgem(hawk), HAWK_NULL, HAWK_ENOERR)
 #define hawk_seterrnum(hawk, errloc, errnum) hawk_gem_seterrnum(hawk_getgem(hawk), errloc, errnum)
 #define hawk_seterrinf(hawk, errinf) hawk_gem_seterrinf(hawk_getgem(hawk), errinf)
 #define hawk_seterror(hawk, errloc, errnum, errarg) hawk_gem_seterror(hawk_getgem(hawk), errloc, errnum, errarg)
@@ -3119,11 +3121,13 @@ static HAWK_INLINE void hawk_rtx_geterror (hawk_rtx_t* rtx, hawk_errnum_t* errnu
  * The hawk_rtx_seterrinf() function sets error information.
  */
 #if defined(HAWK_HAVE_INLINE)
+static HAWK_INLINE void hawk_rtx_clrerror (hawk_rtx_t* rtx) { hawk_gem_seterrnum(hawk_rtx_getgem(rtx), HAWK_NULL, HAWK_ENOERR); }
 static HAWK_INLINE void hawk_rtx_seterrnum (hawk_rtx_t* rtx, const hawk_loc_t* errloc, hawk_errnum_t errnum) { hawk_gem_seterrnum (hawk_rtx_getgem(rtx), errloc, errnum); }
 static HAWK_INLINE void hawk_rtx_seterrinf (hawk_rtx_t* rtx, const hawk_errinf_t* errinf) { hawk_gem_seterrinf (hawk_rtx_getgem(rtx), errinf); }
 static HAWK_INLINE void hawk_rtx_seterror (hawk_rtx_t* rtx, const hawk_loc_t*  errloc, hawk_errnum_t errnum, const hawk_oocs_t* errarg) { hawk_gem_seterror(hawk_rtx_getgem(rtx), errloc, errnum, errarg); }
 static HAWK_INLINE const hawk_ooch_t* hawk_rtx_backuperrmsg (hawk_rtx_t* rtx) { return hawk_gem_backuperrmsg(hawk_rtx_getgem(rtx)); }
 #else
+#define hawk_rtx_clrerror(rtx) hawk_gem_seterrnum(hawk_rtx_getgem(rtx), HAWK_NULL, HAWK_ENOERR)
 #define hawk_rtx_seterrnum(rtx, errloc, errnum) hawk_gem_seterrnum(hawk_rtx_getgem(rtx), errloc, errnum)
 #define hawk_rtx_seterrinf(rtx, errinf) hawk_gem_seterrinf(hawk_rtx_getgem(rtx), errinf)
 #define hawk_rtx_seterror(rtx, errloc, errnum, errarg) hawk_gem_seterror(hawk_rtx_getgem(rtx), errloc, errnum, errarg)

lib/run-prv.h

@@ -30,10 +30,10 @@ enum hawk_assop_type_t
 	/* if you change this, you have to change assop_str in tree.c.
 	 * synchronize it wit:
 	 *   - binop_func in eval_assignment of run.c
+	 *   - binop_func in eval_expression0_xstack in run.c
 	 *   - assop in assing_to_opcode of parse.c
 	 *   - TOK_XXX_ASSN in tok_t in parse.c
 	 *   - assop_str in tree.c
-	 *   - ass_binop in eval_expression0_xstack in run.c
 	 */
 	HAWK_ASSOP_NONE,
 	HAWK_ASSOP_PLUS,   /* += */