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.
7 ;;;; This software is part of the SBCL system. See the README file for
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.
18 ;;; ANSI limits on compilation
19 (def!constant sb!xc:call-arguments-limit most-positive-fixnum
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 most-positive-fixnum
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 most-positive-fixnum
30 "The exclusive upper bound on the number of multiple VALUES that you can
33 (defconstant-eqx sb!xc:lambda-list-keywords
45 "symbols which are magical in a lambda list")
47 ;;;; cross-compiler-only versions of CL special variables, so that we
48 ;;;; don't have weird interactions with the host compiler
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*)
55 ;;;; miscellaneous types used both in the cross-compiler and on the target
57 ;;;; FIXME: The INDEX and LAYOUT-DEPTHOID definitions probably belong
58 ;;;; somewhere else, not "early-c", since they're after all not part
61 ;;; the type of LAYOUT-DEPTHOID slot values
62 (def!type sb!kernel::layout-depthoid () '(or index (integer -1 -1)))
64 ;;; possible values for the INLINE-ness of a function.
66 '(member :inline :maybe-inline :notinline nil))
67 (defparameter *inlinep-translations*
69 (notinline . :notinline)
70 (maybe-inline . :maybe-inline)))
72 ;;; the lexical environment we are currently converting in
74 (declaim (type lexenv *lexenv*))
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.
81 (declaim (type hash-table *free-vars* *free-funs*))
83 ;;; We use the same CONSTANT structure to represent all equal anonymous
84 ;;; constants. This hashtable translates from constants to the LEAFs that
87 (declaim (type hash-table *constants*))
89 ;;; miscellaneous forward declarations
90 (defvar *code-segment*)
91 #!+sb-dyncount (defvar *collect-dynamic-statistics*)
92 (defvar *component-being-compiled*)
93 (defvar *compiler-error-context*)
94 (defvar *compiler-error-count*)
95 (defvar *compiler-warning-count*)
96 (defvar *compiler-style-warning-count*)
97 (defvar *compiler-note-count*)
98 (defvar *compiler-trace-output*)
99 (defvar *constraint-number*)
100 (defvar *count-vop-usages*)
101 (defvar *current-path*)
102 (defvar *current-component*)
103 (defvar *delayed-ir1-transforms*)
104 (defvar *handled-conditions*)
105 (defvar *disabled-package-locks*)
107 (defvar *dynamic-counts-tn*)
109 (defvar *event-info*)
110 (defvar *event-note-threshold*)
112 (defvar *fixup-notes*)
114 (defvar *info-environment*)
116 (defvar *source-info*)
117 (defvar *trace-table*)
118 (defvar *undefined-warnings*)
119 (defvar *warnings-p*)
121 ;;; This lock is seized in the compiler, and related areas: the
122 ;;; compiler is not presently thread-safe
123 (defvar *big-compiler-lock*
124 (sb!thread:make-mutex :name "big compiler lock"))
126 ;;; unique ID for the next object created (to let us track object
127 ;;; identity even across GC, useful for understanding weird compiler
128 ;;; bugs where something is supposed to be unique but is instead
129 ;;; exists as duplicate objects)
132 (defvar *object-id-counter* 0)
133 (defun new-object-id ()
136 (incf *object-id-counter*))))
138 ;;;; miscellaneous utilities
140 ;;; Delete any undefined warnings for NAME and KIND. This is for the
141 ;;; benefit of the compiler, but it's sometimes called from stuff like
142 ;;; type-defining code which isn't logically part of the compiler.
143 (declaim (ftype (function ((or symbol cons) keyword) (values))
145 (defun note-name-defined (name kind)
146 ;; We do this BOUNDP check because this function can be called when
147 ;; not in a compilation unit (as when loading top level forms).
148 (when (boundp '*undefined-warnings*)
149 (setq *undefined-warnings*
150 (delete-if (lambda (x)
151 (and (equal (undefined-warning-name x) name)
152 (eq (undefined-warning-kind x) kind)))
153 *undefined-warnings*)))
156 ;;; to be called when a variable is lexically bound
157 (declaim (ftype (function (symbol) (values)) note-lexical-binding))
158 (defun note-lexical-binding (symbol)
159 ;; This check is intended to protect us from getting silently
160 ;; burned when we define
163 ;; (DEFUN FOO (X) (+ X *FOO*))
168 ;; and then we happen to compile bar.lisp before foo.lisp.
169 (when (looks-like-name-of-special-var-p symbol)
170 ;; FIXME: should be COMPILER-STYLE-WARNING?
171 (style-warn "using the lexical binding of the symbol ~S, not the~@
172 dynamic binding, even though the symbol name follows the usual naming~@
173 convention (names like *FOO*) for special variables" symbol))
176 ;;; Hacky (duplicating machinery found elsewhere because this function
177 ;;; turns out to be on a critical path in the compiler) shorthand for
178 ;;; creating debug names from source names or other stems, e.g.
180 ;;; (DEBUG-NAMIFY "FLET " SOURCE-NAME) -> "FLET FOO:BAR"
181 ;;; (DEBUG-NAMIFY "top level form " FORM) -> "top level form (QUUX :FOO)"
183 ;;; If ALT is given it must be a string -- it is then used in place of
184 ;;; either HEAD or TAIL if either of them is EQ to SB-C::.ANONYMOUS.
186 (declaim (inline debug-namify))
187 (defun debug-namify (head tail &optional alt)
188 (declare (type (or null string) alt))
189 (flet ((symbol-debug-name (symbol)
190 ;; KLUDGE: (OAOOM warning) very much akin to OUTPUT-SYMBOL.
191 (if (and alt (eq '.anonymous. symbol))
193 (let ((package (symbol-package symbol))
194 (name (symbol-name symbol)))
196 ((eq package *keyword-package*)
197 (concatenate 'string ":" name))
198 ((eq package *cl-package*)
201 (concatenate 'string "#:" name))
203 (multiple-value-bind (symbol status)
204 (find-symbol name package)
205 (declare (ignore symbol))
207 (package-name package)
208 (if (eq status :external) ":" "::")
210 (cond ((and (stringp head) (stringp tail))
211 (concatenate 'string head tail))
212 ((and (stringp head) (symbolp tail))
213 (concatenate 'string head (symbol-debug-name tail)))
214 ((and (symbolp head) (stringp tail))
215 (concatenate 'string (symbol-debug-name head) tail))
217 (macrolet ((out (obj s)
219 (string (write-string ,obj ,s))
220 (symbol (write-string (symbol-debug-name ,obj) ,s))
221 (t (prin1 ,obj ,s)))))
222 (with-standard-io-syntax
223 (let ((*print-readably* nil)
225 (*package* *cl-package*)
228 (with-output-to-string (s)