src/compiler/early-c.lisp

   1 ;;;; This file contains compiler code and compiler-related stuff which
   2 ;;;; can be built early on. Some of the stuff may be here because it's
   3 ;;;; needed early on, some other stuff (e.g. constants) just because
   4 ;;;; it might as well be done early so we don't have to think about
   5 ;;;; whether it's done early enough.
   6
   7 ;;;; This software is part of the SBCL system. See the README file for
   8 ;;;; more information.
   9 ;;;;
  10 ;;;; This software is derived from the CMU CL system, which was
  11 ;;;; written at Carnegie Mellon University and released into the
  12 ;;;; public domain. The software is in the public domain and is
  13 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  14 ;;;; files for more information.
  15
  16 (in-package "SB!C")
  17
  18 ;;; ANSI limits on compilation
  19 (def!constant sb!xc:call-arguments-limit sb!xc:most-positive-fixnum
  20   #!+sb-doc
  21   "The exclusive upper bound on the number of arguments which may be passed
  22   to a function, including &REST args.")
  23 (def!constant sb!xc:lambda-parameters-limit sb!xc:most-positive-fixnum
  24   #!+sb-doc
  25   "The exclusive upper bound on the number of parameters which may be specifed
  26   in a given lambda list. This is actually the limit on required and &OPTIONAL
  27   parameters. With &KEY and &AUX you can get more.")
  28 (def!constant sb!xc:multiple-values-limit sb!xc:most-positive-fixnum
  29   #!+sb-doc
  30   "The exclusive upper bound on the number of multiple VALUES that you can
  31   return.")
  32
  33 (defconstant-eqx sb!xc:lambda-list-keywords
  34   '(&allow-other-keys
  35     &aux
  36     &body
  37     &environment
  38     &key
  39     &more
  40     &optional
  41     &rest
  42     &whole)
  43   #'equal
  44   #!+sb-doc
  45   "symbols which are magical in a lambda list")
  46 \f
  47 ;;;; cross-compiler-only versions of CL special variables, so that we
  48 ;;;; don't have weird interactions with the host compiler
  49
  50 (defvar sb!xc:*compile-file-pathname*)
  51 (defvar sb!xc:*compile-file-truename*)
  52 (defvar sb!xc:*compile-print*)
  53 (defvar sb!xc:*compile-verbose*)
  54 \f
  55 ;;;; miscellaneous types used both in the cross-compiler and on the target
  56
  57 ;;;; FIXME: The INDEX and LAYOUT-DEPTHOID definitions probably belong
  58 ;;;; somewhere else, not "early-c", since they're after all not part
  59 ;;;; of the compiler.
  60
  61 ;;; the type of LAYOUT-DEPTHOID slot values
  62 (def!type sb!kernel::layout-depthoid () '(or index (integer -1 -1)))
  63 \f
  64 ;;; possible values for the INLINE-ness of a function.
  65 (deftype inlinep ()
  66   '(member :inline :maybe-inline :notinline nil))
  67 (defparameter *inlinep-translations*
  68   '((inline . :inline)
  69     (notinline . :notinline)
  70     (maybe-inline . :maybe-inline)))
  71
  72 ;;; the lexical environment we are currently converting in
  73 (defvar *lexenv*)
  74 (declaim (type lexenv *lexenv*))
  75
  76 ;;; *FREE-VARS* translates from the names of variables referenced
  77 ;;; globally to the LEAF structures for them. *FREE-FUNS* is like
  78 ;;; *FREE-VARS*, only it deals with function names.
  79 (defvar *free-vars*)
  80 (defvar *free-funs*)
  81 (declaim (type hash-table *free-vars* *free-funs*))
  82
  83 ;;; We use the same CONSTANT structure to represent all equal anonymous
  84 ;;; constants. This hashtable translates from constants to the LEAFs that
  85 ;;; represent them.
  86 (defvar *constants*)
  87 (declaim (type hash-table *constants*))
  88
  89 ;;; *ALLOW-INSTRUMENTING* controls whether we should allow the
  90 ;;; insertion of instrumenting code (like a (CATCH ...)) around code
  91 ;;; to allow the debugger RETURN and STEP commands to function (we
  92 ;;; disallow it for internal stuff).
  93 (defvar *allow-instrumenting*)
  94
  95 ;;; miscellaneous forward declarations
  96 (defvar *code-segment*)
  97 #!+sb-dyncount (defvar *collect-dynamic-statistics*)
  98 (defvar *component-being-compiled*)
  99 (defvar *compiler-error-context*)
 100 (defvar *compiler-error-count*)
 101 (defvar *compiler-warning-count*)
 102 (defvar *compiler-style-warning-count*)
 103 (defvar *compiler-note-count*)
 104 (defvar *compiler-trace-output*)
 105 (defvar *constraint-number*)
 106 (defvar *count-vop-usages*)
 107 (defvar *current-path*)
 108 (defvar *current-component*)
 109 (defvar *delayed-ir1-transforms*)
 110 (defvar *handled-conditions*)
 111 (defvar *disabled-package-locks*)
 112 (defvar *policy*)
 113 (defvar *dynamic-counts-tn*)
 114 (defvar *elsewhere*)
 115 (defvar *event-info*)
 116 (defvar *event-note-threshold*)
 117 (defvar *failure-p*)
 118 (defvar *fixup-notes*)
 119 (defvar *in-pack*)
 120 (defvar *info-environment*)
 121 (defvar *lexenv*)
 122 (defvar *source-info*)
 123 (defvar *trace-table*)
 124 (defvar *undefined-warnings*)
 125 (defvar *warnings-p*)
 126
 127 ;;; This lock is seized in the compiler, and related areas: the
 128 ;;; compiler is not presently thread-safe
 129 (defvar *big-compiler-lock*
 130   (sb!thread:make-mutex :name "big compiler lock"))
 131
 132 ;;; unique ID for the next object created (to let us track object
 133 ;;; identity even across GC, useful for understanding weird compiler
 134 ;;; bugs where something is supposed to be unique but is instead
 135 ;;; exists as duplicate objects)
 136 #!+sb-show
 137 (progn
 138   (defvar *object-id-counter* 0)
 139   (defun new-object-id ()
 140     (prog1
 141         *object-id-counter*
 142       (incf *object-id-counter*))))
 143 \f
 144 ;;;; miscellaneous utilities
 145
 146 ;;; Delete any undefined warnings for NAME and KIND. This is for the
 147 ;;; benefit of the compiler, but it's sometimes called from stuff like
 148 ;;; type-defining code which isn't logically part of the compiler.
 149 (declaim (ftype (function ((or symbol cons) keyword) (values))
 150                 note-name-defined))
 151 (defun note-name-defined (name kind)
 152   ;; We do this BOUNDP check because this function can be called when
 153   ;; not in a compilation unit (as when loading top level forms).
 154   (when (boundp '*undefined-warnings*)
 155     (setq *undefined-warnings*
 156           (delete-if (lambda (x)
 157                        (and (equal (undefined-warning-name x) name)
 158                             (eq (undefined-warning-kind x) kind)))
 159                      *undefined-warnings*)))
 160   (values))
 161
 162 ;;; to be called when a variable is lexically bound
 163 (declaim (ftype (function (symbol) (values)) note-lexical-binding))
 164 (defun note-lexical-binding (symbol)
 165     ;; This check is intended to protect us from getting silently
 166     ;; burned when we define
 167     ;;   foo.lisp:
 168     ;;     (DEFVAR *FOO* -3)
 169     ;;     (DEFUN FOO (X) (+ X *FOO*))
 170     ;;   bar.lisp:
 171     ;;     (DEFUN BAR (X)
 172     ;;       (LET ((*FOO* X))
 173     ;;         (FOO 14)))
 174     ;; and then we happen to compile bar.lisp before foo.lisp.
 175   (when (looks-like-name-of-special-var-p symbol)
 176     ;; FIXME: should be COMPILER-STYLE-WARNING?
 177     (style-warn "using the lexical binding of the symbol ~S, not the~@
 178 dynamic binding, even though the symbol name follows the usual naming~@
 179 convention (names like *FOO*) for special variables" symbol))
 180   (values))
 181
 182 (defvar *debug-name-level* 6)
 183
 184 (defun debug-name (type thing)
 185   (labels ((walk (x level)
 186              (if (> *debug-name-level* (incf level))
 187                  (typecase x
 188                    (cons
 189                     (cons (walk (car x) level) (walk (cdr x) level)))
 190                    ((or symbol number string)
 191                     x)
 192                    (t
 193                     (format nil "#<~S>" (type-of x))))
 194                  "#<...>")))
 195     ;; FIXME: It might be nice to put markers in the tree instead of
 196     ;; this #<...> business, so that they would evantually be printed
 197     ;; without the quotes.
 198     (let ((name (list type (walk thing 0))))
 199       (when (legal-fun-name-p name)
 200         (bug "~S is a legal function name, and cannot be used as a ~
 201               debug name." name))
 202       name)))