# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1578427207 -3600
# Node ID af1eca322b9ef35b4e8ba9b1cee1accc51434376
# Parent  d7a865d2db068a21b0615565db8a78221b6199f3
patch 8.2.0098: exe stack length can be wrong without being detected

Commit: https://github.com/vim/vim/commit/e31ee86859528a7ffe00405645547d494e522fa8
Author: Bram Moolenaar <Bram@vim.org>
Date:   Tue Jan 7 20:59:34 2020 +0100

    patch 8.2.0098: exe stack length can be wrong without being detected

    Problem:    Exe stack length can be wrong without being detected.
    Solution:   Add a check when ABORT_ON_INTERNAL_ERROR is defined.

diff --git a/src/autocmd.c b/src/autocmd.c
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -1827,6 +1827,7 @@ apply_autocmds_group(
     int		did_save_redobuff = FALSE;
     save_redo_T	save_redo;
     int		save_KeyTyped = KeyTyped;
+    ESTACK_CHECK_DECLARATION
 
     /*
      * Quickly return if there are no autocommands for this event or
@@ -2021,6 +2022,7 @@ apply_autocmds_group(
 
     // name and lnum are filled in later
     estack_push(ETYPE_AUCMD, NULL, 0);
+    ESTACK_CHECK_SETUP
 
 #ifdef FEAT_EVAL
     save_current_sctx = current_sctx;
@@ -2124,6 +2126,7 @@ apply_autocmds_group(
     filechangeshell_busy = FALSE;
     autocmd_nested = save_autocmd_nested;
     vim_free(SOURCING_NAME);
+    ESTACK_CHECK_NOW
     estack_pop();
     vim_free(autocmd_fname);
     autocmd_fname = save_autocmd_fname;
diff --git a/src/buffer.c b/src/buffer.c
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5287,6 +5287,7 @@ chk_modeline(
 #ifdef FEAT_EVAL
     sctx_T	save_current_sctx;
 #endif
+    ESTACK_CHECK_DECLARATION
 
     prev = -1;
     for (s = ml_get(lnum); *s != NUL; ++s)
@@ -5330,6 +5331,7 @@ chk_modeline(
 
 	// prepare for emsg()
 	estack_push(ETYPE_MODELINE, (char_u *)"modelines", lnum);
+	ESTACK_CHECK_SETUP
 
 	end = FALSE;
 	while (end == FALSE)
@@ -5390,6 +5392,7 @@ chk_modeline(
 	    s = e + 1;			// advance to next part
 	}
 
+	ESTACK_CHECK_NOW
 	estack_pop();
 	vim_free(linecopy);
     }
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -645,6 +645,7 @@ do_cmdline(
 # define cmd_cookie cookie
 #endif
     static int	call_depth = 0;		// recursiveness
+    ESTACK_CHECK_DECLARATION
 
 #ifdef FEAT_EVAL
     // For every pair of do_cmdline()/do_one_cmd() calls, use an extra memory
@@ -1260,6 +1261,7 @@ do_cmdline(
 
 	    estack_push(ETYPE_EXCEPT, current_exception->throw_name,
 						current_exception->throw_lnum);
+	    ESTACK_CHECK_SETUP
 	    current_exception->throw_name = NULL;
 
 	    discard_current_exception();	// uses IObuff if 'verbose'
@@ -1284,6 +1286,7 @@ do_cmdline(
 		vim_free(p);
 	    }
 	    vim_free(SOURCING_NAME);
+	    ESTACK_CHECK_NOW
 	    estack_pop();
 	}
 
diff --git a/src/macros.h b/src/macros.h
--- a/src/macros.h
+++ b/src/macros.h
@@ -344,3 +344,15 @@
 #else
 # define ERROR_IF_POPUP_WINDOW 0
 #endif
+
+
+#ifdef ABORT_ON_INTERNAL_ERROR
+# define ESTACK_CHECK_DECLARATION int estack_len_before;
+# define ESTACK_CHECK_SETUP estack_len_before = exestack.ga_len;
+# define ESTACK_CHECK_NOW if (estack_len_before != exestack.ga_len) \
+	siemsg("Exestack length expected: %d, actual: %d", estack_len_before, exestack.ga_len);
+#else
+# define ESTACK_CHECK_DECLARATION
+# define ESTACK_CHECK_SETUP
+# define ESTACK_CHECK_NOW
+#endif
diff --git a/src/main.c b/src/main.c
--- a/src/main.c
+++ b/src/main.c
@@ -3086,16 +3086,19 @@ exe_pre_commands(mparm_T *parmp)
     char_u	**cmds = parmp->pre_commands;
     int		cnt = parmp->n_pre_commands;
     int		i;
+    ESTACK_CHECK_DECLARATION
 
     if (cnt > 0)
     {
 	curwin->w_cursor.lnum = 0; // just in case..
 	estack_push(ETYPE_ARGS, (char_u *)_("pre-vimrc command line"), 0);
+	ESTACK_CHECK_SETUP
 # ifdef FEAT_EVAL
 	current_sctx.sc_sid = SID_CMDARG;
 # endif
 	for (i = 0; i < cnt; ++i)
 	    do_cmdline_cmd(cmds[i]);
+	ESTACK_CHECK_NOW
 	estack_pop();
 # ifdef FEAT_EVAL
 	current_sctx.sc_sid = 0;
@@ -3111,6 +3114,7 @@ exe_pre_commands(mparm_T *parmp)
 exe_commands(mparm_T *parmp)
 {
     int		i;
+    ESTACK_CHECK_DECLARATION
 
     /*
      * We start commands on line 0, make "vim +/pat file" match a
@@ -3121,6 +3125,7 @@ exe_commands(mparm_T *parmp)
     if (parmp->tagname == NULL && curwin->w_cursor.lnum <= 1)
 	curwin->w_cursor.lnum = 0;
     estack_push(ETYPE_ARGS, (char_u *)"command line", 0);
+    ESTACK_CHECK_SETUP
 #ifdef FEAT_EVAL
     current_sctx.sc_sid = SID_CARG;
     current_sctx.sc_seq = 0;
@@ -3131,6 +3136,7 @@ exe_commands(mparm_T *parmp)
 	if (parmp->cmds_tofree[i])
 	    vim_free(parmp->commands[i]);
     }
+    ESTACK_CHECK_NOW
     estack_pop();
 #ifdef FEAT_EVAL
     current_sctx.sc_sid = 0;
@@ -3340,12 +3346,14 @@ process_env(
 #ifdef FEAT_EVAL
     sctx_T	save_current_sctx;
 #endif
+    ESTACK_CHECK_DECLARATION
 
     if ((initstr = mch_getenv(env)) != NULL && *initstr != NUL)
     {
 	if (is_viminit)
 	    vimrc_found(NULL, NULL);
 	estack_push(ETYPE_ENV, env, 0);
+	ESTACK_CHECK_SETUP
 #ifdef FEAT_EVAL
 	save_current_sctx = current_sctx;
 	current_sctx.sc_sid = SID_ENV;
@@ -3355,6 +3363,7 @@ process_env(
 #endif
 	do_cmdline_cmd(initstr);
 
+	ESTACK_CHECK_NOW
 	estack_pop();
 #ifdef FEAT_EVAL
 	current_sctx = save_current_sctx;
diff --git a/src/map.c b/src/map.c
--- a/src/map.c
+++ b/src/map.c
@@ -1918,10 +1918,12 @@ check_map_keycodes(void)
     int		abbr;
     int		hash;
     buf_T	*bp;
+    ESTACK_CHECK_DECLARATION
 
     validate_maphash();
     // avoids giving error messages
     estack_push(ETYPE_INTERNAL, (char_u *)"mappings", 0);
+    ESTACK_CHECK_SETUP
 
     // Do this once for each buffer, and then once for global
     // mappings/abbreviations with bp == NULL
@@ -1978,6 +1980,7 @@ check_map_keycodes(void)
 	if (bp == NULL)
 	    break;
     }
+    ESTACK_CHECK_NOW
     estack_pop();
 }
 
diff --git a/src/scriptfile.c b/src/scriptfile.c
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -1099,6 +1099,7 @@ do_source(
     proftime_T		    wait_start;
 #endif
     int			    trigger_source_post = FALSE;
+    ESTACK_CHECK_DECLARATION
 
     p = expand_env_save(fname);
     if (p == NULL)
@@ -1216,6 +1217,7 @@ do_source(
 
     // Keep the sourcing name/lnum, for recursive calls.
     estack_push(ETYPE_SCRIPT, fname_exp, 0);
+    ESTACK_CHECK_SETUP
 
 #ifdef STARTUPTIME
     if (time_fd != NULL)
@@ -1355,6 +1357,7 @@ do_source(
 
     if (got_int)
 	emsg(_(e_interr));
+    ESTACK_CHECK_NOW
     estack_pop();
     if (p_verbose > 1)
     {
diff --git a/src/spellfile.c b/src/spellfile.c
--- a/src/spellfile.c
+++ b/src/spellfile.c
@@ -353,6 +353,7 @@ spell_load_file(
     int		c = 0;
     int		res;
     int		did_estack_push = FALSE;
+    ESTACK_CHECK_DECLARATION
 
     fd = mch_fopen((char *)fname, "r");
     if (fd == NULL)
@@ -393,6 +394,7 @@ spell_load_file(
 
     // Set sourcing_name, so that error messages mention the file name.
     estack_push(ETYPE_SPELL, fname, 0);
+    ESTACK_CHECK_SETUP
     did_estack_push = TRUE;
 
     /*
@@ -581,7 +583,10 @@ endOK:
     if (fd != NULL)
 	fclose(fd);
     if (did_estack_push)
+    {
+	ESTACK_CHECK_NOW
 	estack_pop();
+    }
 
     return lp;
 }
diff --git a/src/userfunc.c b/src/userfunc.c
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -793,6 +793,7 @@ call_user_func(
     proftime_T	call_start;
     int		started_profiling = FALSE;
 #endif
+    ESTACK_CHECK_DECLARATION
 
     // If depth of calling is getting too high, don't execute the function
     if (depth >= p_mfd)
@@ -969,6 +970,7 @@ call_user_func(
     }
 
     estack_push_ufunc(ETYPE_UFUNC, fp, 1);
+    ESTACK_CHECK_SETUP
     if (p_verbose >= 12)
     {
 	++no_wait_return;
@@ -1115,6 +1117,7 @@ call_user_func(
 	--no_wait_return;
     }
 
+    ESTACK_CHECK_NOW
     estack_pop();
     current_sctx = save_current_sctx;
 #ifdef FEAT_PROFILE
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    98,
+/**/
     97,
 /**/
     96,