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Introduce expression::first_opcode

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This adds a new helper method, expression::first_opcode, that extracts
the outermost opcode of an expression.  This simplifies some patches
in the expression rewrite series.

Note that this patch requires the earlier patch to avoid manual
dissection of OP_TYPE operations.

2020-12-15  Tom Tromey  <tom@tromey.com>

	* varobj.c (varobj_create): Use first_opcode.
	* value.c (init_if_undefined_command): Use first_opcode.
	* typeprint.c (whatis_exp): Use first_opcode.
	* tracepoint.c (validate_actionline): Use first_opcode.
	(encode_actions_1): Use first_opcode.
	* stack.c (return_command): Use first_opcode.
	* expression.h (struct expression) <first_opcode>: New method.
	* eval.c (parse_and_eval_type): Use first_opcode.
	* dtrace-probe.c (dtrace_process_dof_probe): Use first_opcode.
This commit is contained in:
Tom Tromey 2020-12-15 18:14:42 -07:00
parent 1ab8280d7d
commit 2adab65cc0
9 changed files with 31 additions and 11 deletions
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7
gdb/expression.h
View file

@ -91,6 +91,13 @@ struct expression
void resize (size_t);
/* Return the opcode for the outermost sub-expression of this
expression. */
enum exp_opcode first_opcode () const
{
return elts[0].opcode;
}
/* Language it was entered in. */
const struct language_defn *language_defn;
/* Architecture it was parsed in. */