refactor: move non-symbols in ex_eval.h to ex_eval_defs.h (#19739)

This avoids including ex_eval.h in any other header, thus preventing
future circular includes.

src/nvim/ex_eval.h

@@ -2,81 +2,7 @@
 #define NVIM_EX_EVAL_H
 
 #include "nvim/ex_cmds_defs.h"  // for exarg_T
-#include "nvim/pos.h"           // for linenr_T
-
-/* There is no CSF_IF, the lack of CSF_WHILE, CSF_FOR and CSF_TRY means ":if"
- * was used. */
-#define CSF_TRUE       0x0001  // condition was TRUE
-#define CSF_ACTIVE     0x0002  // current state is active
-#define CSF_ELSE       0x0004  // ":else" has been passed
-#define CSF_WHILE      0x0008  // is a ":while"
-#define CSF_FOR        0x0010  // is a ":for"
-
-#define CSF_TRY        0x0100  // is a ":try"
-#define CSF_FINALLY    0x0200  // ":finally" has been passed
-#define CSF_THROWN     0x0800  // exception thrown to this try conditional
-#define CSF_CAUGHT     0x1000  // exception caught by this try conditional
-#define CSF_FINISHED   0x2000  // CSF_CAUGHT was handled by finish_exception()
-#define CSF_SILENT     0x4000  // "emsg_silent" reset by ":try"
-// Note that CSF_ELSE is only used when CSF_TRY and CSF_WHILE are unset
-// (an ":if"), and CSF_SILENT is only used when CSF_TRY is set.
-
-/*
- * What's pending for being reactivated at the ":endtry" of this try
- * conditional:
- */
-#define CSTP_NONE      0       // nothing pending in ":finally" clause
-#define CSTP_ERROR     1       // an error is pending
-#define CSTP_INTERRUPT 2       // an interrupt is pending
-#define CSTP_THROW     4       // a throw is pending
-#define CSTP_BREAK     8       // ":break" is pending
-#define CSTP_CONTINUE  16      // ":continue" is pending
-#define CSTP_RETURN    24      // ":return" is pending
-#define CSTP_FINISH    32      // ":finish" is pending
-
-/*
- * A list of error messages that can be converted to an exception.  "throw_msg"
- * is only set in the first element of the list.  Usually, it points to the
- * original message stored in that element, but sometimes it points to a later
- * message in the list.  See cause_errthrow() below.
- */
-struct msglist {
-  char *msg;             // original message
-  char *throw_msg;       // msg to throw: usually original one
-  struct msglist *next;            // next of several messages in a row
-};
-
-// The exception types.
-typedef enum {
-  ET_USER,       // exception caused by ":throw" command
-  ET_ERROR,      // error exception
-  ET_INTERRUPT,  // interrupt exception triggered by Ctrl-C
-} except_type_T;
-
-/*
- * Structure describing an exception.
- * (don't use "struct exception", it's used by the math library).
- */
-typedef struct vim_exception except_T;
-struct vim_exception {
-  except_type_T type;                   // exception type
-  char *value;           // exception value
-  struct msglist *messages;        // message(s) causing error exception
-  char *throw_name;      // name of the throw point
-  linenr_T throw_lnum;                  // line number of the throw point
-  except_T *caught;          // next exception on the caught stack
-};
-
-/*
- * Structure to save the error/interrupt/exception state between calls to
- * enter_cleanup() and leave_cleanup().  Must be allocated as an automatic
- * variable by the (common) caller of these functions.
- */
-typedef struct cleanup_stuff cleanup_T;
-struct cleanup_stuff {
-  int pending;                  // error/interrupt/exception state
-  except_T *exception;          // exception value
-};
+#include "nvim/ex_eval_defs.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "ex_eval.h.generated.h"