gdb/guile/lib/gdb/types.scm

   1 ;; Type utilities.
   2 ;; Copyright (C) 2010-2020 Free Software Foundation, Inc.
   3 ;;
   4 ;; This program is free software; you can redistribute it and/or modify
   5 ;; it under the terms of the GNU General Public License as published by
   6 ;; the Free Software Foundation; either version 3 of the License, or
   7 ;; (at your option) any later version.
   8 ;;
   9 ;; This program is distributed in the hope that it will be useful,
  10 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 ;; GNU General Public License for more details.
  13 ;;
  14 ;; You should have received a copy of the GNU General Public License
  15 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 (define-module (gdb types)
  18   #:use-module (gdb)
  19   #:use-module (gdb iterator)
  20   #:use-module (gdb support))
  21
  22 (define-public (type-has-field-deep? type field-name)
  23   "Return #t if the type, including baseclasses, has the specified field.
  24
  25   Arguments:
  26     type: The type to examine.  It must be a struct or union.
  27     field-name: The name of the field to look up.
  28
  29   Returns:
  30     True if the field is present either in type_ or any baseclass.
  31
  32   Raises:
  33     wrong-type-arg: The type is not a struct or union."
  34
  35   (define (search-class type)
  36     (let ((find-in-baseclass (lambda (field)
  37                                (if (field-baseclass? field)
  38                                    (search-class (field-type field))
  39                                    ;; Not a baseclass, search ends now.
  40                                    ;; Return #:end to end search.
  41                                    #:end))))
  42       (let ((search-baseclasses
  43              (lambda (type)
  44                (iterator-until find-in-baseclass
  45                                (make-field-iterator type)))))
  46         (or (type-has-field? type field-name)
  47             (not (eq? (search-baseclasses type) #:end))))))
  48
  49   (if (= (type-code type) TYPE_CODE_REF)
  50       (set! type (type-target type)))
  51   (set! type (type-strip-typedefs type))
  52
  53   (assert-type (memq (type-code type) (list TYPE_CODE_STRUCT TYPE_CODE_UNION))
  54                type SCM_ARG1 'type-has-field-deep? "struct or union")
  55
  56   (search-class type))
  57
  58 (define-public (make-enum-hashtable enum-type)
  59   "Return a hash table from a program's enum type.
  60
  61   Elements in the hash table are fetched with hashq-ref.
  62
  63   Arguments:
  64     enum-type: The enum to compute the hash table for.
  65
  66   Returns:
  67     The hash table of the enum.
  68
  69   Raises:
  70     wrong-type-arg: The type is not an enum."
  71
  72   (assert-type (= (type-code enum-type) TYPE_CODE_ENUM)
  73                enum-type SCM_ARG1 'make-enum-hashtable "enum")
  74   (let ((htab (make-hash-table)))
  75     (for-each (lambda (enum)
  76                 (hash-set! htab (field-name enum) (field-enumval enum)))
  77               (type-fields enum-type))
  78     htab))