Refactor implicit function template implementation and fix 58534, 58536, 58548, 58549 and 58637.

gcc/
	* tree.c (grow_tree_vec_stat): New function ...
	* tree.h (grow_tree_vec_stat) (grow_tree_vec): ... and its declaration
	and macro front-end.

gcc/cp/
	PR c++/58534
	PR c++/58536
	PR c++/58548
	PR c++/58549
	PR c++/58637
	* parser.h (struct cp_parser): New members implicit_template_parms,
	implicit_template_scope and auto_is_implicit_function_template_parm_p.
	* parser.c (add_implicit_template_parms): Refactor as ...
	(synthesize_implicit_template_parm): ... this to append a new template
	type parm to the current template parameter list (introducing a new list
	if necessary).  Removed push_deferring_access_checks.
	(finish_fully_implicit_template): Removed pop_deferring_access_checks.
	(cp_parser_new): Initialize new cp_parser members.
	(cp_parser_parameter_declaration_clause): Consider auto as implicit
	template parm when parsing a parameter declaration (unless parsing an
	explicit specialization).
	(cp_parser_parameter_declaration_list): Remove local
	implicit_template_parms counter and reset cp_parser implicit template
	state when complete.
	(cp_parser_lambda_expression): Reset implicit template cp_parser members
	whilst generating lambda class.
	(cp_parser_function_definition_after_declarator): Reset implicit
	template cp_parser members whilst parsing function definition.
	(make_generic_type_name): Respell '<autoN>' as 'auto:N' which works
	better with template diagnostics.
	(cp_parser_simple_type_specifier): Synthesize implicit template parm on
	parsing 'auto' if auto_is_implicit_function_template_parm_p and provide
	diagnostics ...
	* decl.c (grokdeclarator): ... that were previously done here.

gcc/testsuite/g++.dg/
	* cpp1y/pr58534.C: New testcase.
	* cpp1y/pr58536.C: New testcase.
	* cpp1y/pr58548.C: New testcase.
	* cpp1y/pr58549.C: New testcase.
	* cpp1y/pr58637.C: New testcase.

From-SVN: r204714

1 files changed, 22 insertions, 0 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 686a680..dd0371d 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -1864,6 +1864,28 @@ make_tree_vec_stat (int len MEM_STAT_DECL)
 
   return t;
 }
+
+/* Grow a TREE_VEC node to new length LEN.  */
+
+tree
+grow_tree_vec_stat (tree v, int len MEM_STAT_DECL)
+{
+  gcc_assert (TREE_CODE (v) == TREE_VEC);
+
+  int oldlen = TREE_VEC_LENGTH (v);
+  gcc_assert (len > oldlen);
+
+  int oldlength = (oldlen - 1) * sizeof (tree) + sizeof (struct tree_vec);
+  int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
+
+  record_node_allocation_statistics (TREE_VEC, length - oldlength);
+
+  v = (tree) ggc_realloc_stat (v, length PASS_MEM_STAT);
+
+  TREE_VEC_LENGTH (v) = len;
+
+  return v;
+}
 
 /* Return 1 if EXPR is the integer constant zero or a complex constant
    of zero.  */