* parser.c (cp_token_position): New typedef. Define VEC thereof.

	(struct cp_lexer): Allow buffer and buffer_end to be NULL. Make
	next_token and last_token cp_token_position. Make saved_tokens a
	VEC(cp_token_position).
	(eof_token): New static variable.
	(CP_SAVED_TOKENS_SIZE): Rename to ...
	(CP_SAVED_TOKEN_STACK): ... here.
	(cp_lexer_new_main): Adjust main lexer creation and buffer
	filling.
	(cp_lexer_new_from_tokens): Do not copy the tokens, merely point
	to the parent buffer.  Do not append eof token.
	(cp_lexer_destroy): Only free buffer if non-NULL. Free token
	stack.
	(cp_lexer_next_token, cp_lexer_prev_token): Remove.
	(cp_lexer_token_position, cp_lexer_token_at): New.
	(cp_lexer_saving_tokens): Adjust. Make inline.
	(cp_lexer_advance_token, cp_lexer_token_difference): Remove.
	(cp_lexer_peek_token_emit_debug_info): Fold into ...
	(cp_lexer_peek_token): ... here.
	(cp_lexer_peek_nth_token): Don't peek past EOF.
	(cp_lexer_consume_token): Set next_token to eof_token, if reaching
	EOF.
	(cp_lexer_purge_token): Adjust eof setting.
	(cp_lexer_purge_tokens_after): Likewise.
	(cp_lexer_save_tokens): Push next_token directly.
	(cp_lexer_commit_tokens): Adjust.
	(cp_lexer_rollback_tokens): Pop next_token directly.
	(cp_parser_check_for_invalid_template_id): Adjust token purging.
	(cp_parser_translation_unit): Do not consume the EOF.
	(cp_parser_nested_name_specifier_opt): Adjust token purging.
	(cp_parser_template_id, cp_parser_template_name): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@89320 138bc75d-0d04-0410-961f-82ee72b054a4

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