Remove paren_depth global

This removes the "paren_depth" global.  In most cases, it is made into
a static global in a given parser.  I consider this a slight
improvement, because it makes it clear that the variable isn't used
for communication between different modules of gdb.  The one exception
is the Rust parser, which already incorporates all local state into a
transient object; in this case the parser depth is now a member.

gdb/ChangeLog
2019-04-04  Tom Tromey  <tom@tromey.com>

	* rust-exp.y (struct rust_parser) <paren_depth>: New member.
	(rustyylex, rust_lex_test_init, rust_lex_test_one)
	(rust_lex_test_sequence, rust_lex_test_push_back): Update.
	* parser-defs.h (paren_depth): Don't declare.
	* parse.c (paren_depth): Remove global.
	(parse_exp_in_context): Update.
	* p-exp.y (paren_depth): New global.
	(pascal_parse): Initialize it.
	* m2-exp.y (paren_depth): New global.
	(m2_parse): Initialize it.
	* go-exp.y (paren_depth): New global.
	(go_parse): Initialize it.
	* f-exp.y (paren_depth): New global.
	(f_parse): Initialize it.
	* d-exp.y (paren_depth): New global.
	(d_parse): Initialize it.
	* c-exp.y (paren_depth): New global.
	(c_parse): Initialize it.
	* ada-lex.l (paren_depth): New global.
	(lexer_init): Initialize it.

1 files changed, 4 insertions, 0 deletions

diff --git a/gdb/go-exp.y b/gdb/go-exp.y
index d112a73..aaffe3d 100644
--- a/gdb/go-exp.y
+++ b/gdb/go-exp.y
@@ -1001,6 +1001,9 @@ static int saw_name_at_eof;
    do field name completion.  */
 static int last_was_structop;
 
+/* Depth of parentheses.  */
+static int paren_depth;
+
 /* Read one token, getting characters through lexptr.  */
 
 static int
@@ -1566,6 +1569,7 @@ go_parse (struct parser_state *par_state)
   /* Initialize some state used by the lexer.  */
   last_was_structop = 0;
   saw_name_at_eof = 0;
+  paren_depth = 0;
 
   token_fifo.clear ();
   popping = 0;