source: trunk/abcl/src/org/armedbear/lisp/jvm-class-file.lisp @ 13046

Last change on this file since 13046 was 13046, checked in by ehuelsmann, 11 years ago

Fix ANSI regressions caused by the implementation
of the new class writer.

Found by: Mark Evenson
Patch by: me

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 50.2 KB
Line 
1;;; jvm-class-file.lisp
2;;;
3;;; Copyright (C) 2010 Erik Huelsmann
4;;; $Id: jvm-class-file.lisp 13046 2010-11-25 13:15:18Z ehuelsmann $
5;;;
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
19;;;
20;;; As a special exception, the copyright holders of this library give you
21;;; permission to link this library with independent modules to produce an
22;;; executable, regardless of the license terms of these independent
23;;; modules, and to copy and distribute the resulting executable under
24;;; terms of your choice, provided that you also meet, for each linked
25;;; independent module, the terms and conditions of the license of that
26;;; module.  An independent module is a module which is not derived from
27;;; or based on this library.  If you modify this library, you may extend
28;;; this exception to your version of the library, but you are not
29;;; obligated to do so.  If you do not wish to do so, delete this
30;;; exception statement from your version.
31
32(in-package "JVM")
33
34#|
35
36The general design of the class-file writer is to have generic
37- human readable - representations of the class being generated
38during the construction and manipulation phases.
39
40After completing the creation/manipulation of the class, all its
41components will be finalized. This process translates readable
42(e.g. string) representations to indices to be stored on disc.
43
44The only thing to be done after finalization is sending the
45output to a stream ("writing").
46
47
48Finalization happens highest-level first. As an example, take a
49method with exception handlers. The exception handlers are stored
50as attributes in the class file structure. They are children of the
51method's Code attribute. In this example, the body of the Code
52attribute (the higher level) gets finalized before the attributes.
53The reason to do so is that the exceptions need to refer to labels
54(offsets) in the Code segment.
55
56
57|#
58
59
60(defun map-primitive-type (type)
61  "Maps a symbolic primitive type name to its Java string representation."
62  (case type
63    (:int        "I")
64    (:long       "J")
65    (:float      "F")
66    (:double     "D")
67    (:boolean    "Z")
68    (:char       "C")
69    (:byte       "B")
70    (:short      "S")
71    ((nil :void) "V")))
72
73
74#|
75
76The `class-name' facility helps to abstract from "this instruction takes
77a reference" and "this instruction takes a class name". We simply pass
78the class name around and the instructions themselves know which
79representation to use.
80
81|#
82
83(defstruct (jvm-class-name (:conc-name class-)
84         (:constructor %make-jvm-class-name))
85  "Used for class identification.
86
87The caller should instantiate only one `class-name' per class, as they are
88used as class identifiers and compared using EQ.
89
90Some instructions need a class argument, others need a reference identifier.
91This class is used to abstract from the difference."
92  name-internal
93  ref
94  array-class ;; cached array class reference
95  ;; keeping a reference to the associated array class allows class
96  ;; name comparisons to be EQ: all classes should exist only once,
97  )
98
99(defun make-jvm-class-name (name)
100  "Creates a `class-name' structure for the class or interface `name'.
101
102`name' should be specified using Java representation, which is converted
103to 'internal' (JVM) representation by this function."
104  (setf name (substitute #\/ #\. name))
105  (%make-jvm-class-name :name-internal name
106      :ref (concatenate 'string "L" name ";")))
107
108(defun class-array (class-name)
109  "Returns a class-name representing an array of `class-name'.
110For multi-dimensional arrays, call this function multiple times, using
111its own result.
112
113This function can be called multiple times on the same `class-name' without
114violating the 'only one instance' requirement: the returned value is cached
115and used on successive calls."
116  (unless (class-array-class class-name)
117    ;; Alessio Stalla found by dumping a class file that the JVM uses
118    ;; the same representation (ie '[L<class-name>;') in CHECKCAST as
119    ;; it does in field references, meaning the class name and class ref
120    ;; are identified by the same string
121    (let ((name-and-ref (concatenate 'string "[" (class-ref class-name))))
122      (setf (class-array-class class-name)
123            (%make-jvm-class-name :name-internal name-and-ref
124          :ref name-and-ref))))
125  (class-array-class class-name))
126
127(defmacro define-class-name (symbol java-dotted-name &optional documentation)
128  "Convenience macro to define constants for `class-name' structures,
129initialized from the `java-dotted-name'."
130  `(defconstant ,symbol (make-jvm-class-name ,java-dotted-name)
131     ,documentation))
132
133(define-class-name +java-object+ "java.lang.Object")
134(define-class-name +java-string+ "java.lang.String")
135(define-class-name +java-system+ "java.lang.System")
136(define-class-name +lisp-object+ "org.armedbear.lisp.LispObject")
137(defconstant +lisp-object-array+ (class-array +lisp-object+))
138(define-class-name +lisp-simple-string+ "org.armedbear.lisp.SimpleString")
139(define-class-name +lisp+ "org.armedbear.lisp.Lisp")
140(define-class-name +lisp-nil+ "org.armedbear.lisp.Nil")
141(define-class-name +lisp-class+ "org.armedbear.lisp.LispClass")
142(define-class-name +lisp-symbol+ "org.armedbear.lisp.Symbol")
143(define-class-name +lisp-thread+ "org.armedbear.lisp.LispThread")
144(define-class-name +lisp-closure-binding+ "org.armedbear.lisp.ClosureBinding")
145(defconstant +closure-binding-array+ (class-array +lisp-closure-binding+))
146(define-class-name +lisp-integer+ "org.armedbear.lisp.LispInteger")
147(define-class-name +lisp-fixnum+ "org.armedbear.lisp.Fixnum")
148(defconstant +lisp-fixnum-array+ (class-array +lisp-fixnum+))
149(define-class-name +lisp-bignum+ "org.armedbear.lisp.Bignum")
150(define-class-name +lisp-single-float+ "org.armedbear.lisp.SingleFloat")
151(define-class-name +lisp-double-float+ "org.armedbear.lisp.DoubleFloat")
152(define-class-name +lisp-cons+ "org.armedbear.lisp.Cons")
153(define-class-name +lisp-load+ "org.armedbear.lisp.Load")
154(define-class-name +lisp-character+ "org.armedbear.lisp.LispCharacter")
155(defconstant +lisp-character-array+ (class-array +lisp-character+))
156(define-class-name +lisp-structure-object+ "org.armedbear.lisp.StructureObject")
157(define-class-name +lisp-simple-vector+ "org.armedbear.lisp.SimpleVector")
158(define-class-name +lisp-abstract-string+ "org.armedbear.lisp.AbstractString")
159(define-class-name +lisp-abstract-vector+ "org.armedbear.lisp.AbstractVector")
160(define-class-name +lisp-abstract-bit-vector+
161    "org.armedbear.lisp.AbstractBitVector")
162(define-class-name +lisp-environment+ "org.armedbear.lisp.Environment")
163(define-class-name +lisp-special-binding+ "org.armedbear.lisp.SpecialBinding")
164(define-class-name +lisp-special-bindings-mark+
165    "org.armedbear.lisp.SpecialBindingsMark")
166(define-class-name +lisp-throw+ "org.armedbear.lisp.Throw")
167(define-class-name +lisp-return+ "org.armedbear.lisp.Return")
168(define-class-name +lisp-go+ "org.armedbear.lisp.Go")
169(define-class-name +lisp-primitive+ "org.armedbear.lisp.Primitive")
170(define-class-name +lisp-compiled-primitive+
171    "org.armedbear.lisp.CompiledPrimitive")
172(define-class-name +lisp-eql-hash-table+ "org.armedbear.lisp.EqlHashTable")
173(define-class-name +lisp-hash-table+ "org.armedbear.lisp.HashTable")
174(define-class-name +lisp-package+ "org.armedbear.lisp.Package")
175(define-class-name +lisp-readtable+ "org.armedbear.lisp.Readtable")
176(define-class-name +lisp-stream+ "org.armedbear.lisp.Stream")
177(define-class-name +lisp-closure+ "org.armedbear.lisp.Closure")
178(define-class-name +lisp-compiled-closure+ "org.armedbear.lisp.CompiledClosure")
179(define-class-name +lisp-closure-parameter+
180    "org.armedbear.lisp.Closure$Parameter")
181(defconstant +lisp-closure-parameter-array+
182  (class-array +lisp-closure-parameter+))
183
184#|
185
186Lisp-side descriptor representation:
187
188 - list: a list starting with a method return value, followed by
189     the argument types
190 - keyword: the primitive type associated with that keyword
191 - class-name structure instance: the class-ref value
192
193The latter two can be converted to a Java representation using
194the `internal-field-ref' function, the former is to be fed to
195`descriptor'.
196
197|#
198
199(defun internal-field-type (field-type)
200  "Returns a string containing the JVM-internal representation
201of `field-type', which should either be a symbol identifying a primitive
202type, or a `class-name' structure identifying a class or interface."
203  (if (symbolp field-type)
204      (map-primitive-type field-type)
205      (class-name-internal field-type)))
206
207(defun internal-field-ref (field-type)
208  "Returns a string containing the JVM-internal representation of a reference
209to `field-type', which should either be a symbol identifying a primitive
210type, or a `class-name' structure identifying a class or interface."
211  (if (symbolp field-type)
212      (map-primitive-type field-type)
213      (class-ref field-type)))
214
215(defun descriptor (return-type &rest argument-types)
216  "Returns a string describing the `return-type' and `argument-types'
217in JVM-internal representation."
218  (let* ((arg-strings (mapcar #'internal-field-ref argument-types))
219         (ret-string (internal-field-ref return-type))
220         (size (+ 2 (reduce #'+ arg-strings
221                            :key #'length
222                            :initial-value (length ret-string))))
223         (str (make-array size :fill-pointer 0 :element-type 'character)))
224    (with-output-to-string (s str)
225      (princ #\( s)
226      (dolist (arg-string arg-strings)
227        (princ arg-string s))
228      (princ #\) s)
229      (princ ret-string s))
230    str)
231;;  (format nil "(~{~A~})~A"
232;;          (internal-field-ref return-type))
233  )
234
235(defun descriptor-stack-effect (return-type &rest argument-types)
236  "Returns the effect on the stack position of the `argument-types' and
237`return-type' of a method call.
238
239If the method consumes an implicit `this' argument, this function does not
240take that effect into account."
241  (flet ((type-stack-effect (arg)
242           (case arg
243             ((:long :double) 2)
244             ((nil :void) 0)
245             (otherwise 1))))
246    (+ (reduce #'- argument-types
247               :key #'type-stack-effect
248               :initial-value 0)
249       (type-stack-effect return-type))))
250
251
252(defstruct pool
253  ;; `index' contains the index of the last allocated slot (0 == empty)
254  ;; "A constant pool entry is considered valid if it has
255  ;; an index greater than 0 (zero) and less than pool-count"
256  (index 0)
257  entries-list
258  ;; the entries hash stores raw values, except in case of string and
259  ;; utf8, because both are string values
260  (entries (make-hash-table :test #'equal :size 2048 :rehash-size 2.0)))
261
262
263(defstruct constant
264  "Structure to be included in all constant sub-types."
265  tag
266  index)
267
268(defparameter +constant-type-map+
269  '((:class          7 1)
270    (:field-ref      9 1)
271    (:method-ref    10 1)
272    ;; (:interface-method-ref 11)
273    (:string         8 1)
274    (:integer        3 1)
275    (:float          4 1)
276    (:long           5 2)
277    (:double         6 2)
278    (:name-and-type 12 1)
279    (:utf8           1 1)))
280
281(defstruct (constant-class (:constructor make-constant-class (index name-index))
282                           (:include constant
283                                     (tag 7)))
284  "Structure holding information on a 'class' type item in the constant pool."
285  name-index)
286
287(defstruct (constant-member-ref (:constructor
288                                 %make-constant-member-ref
289                                     (tag index class-index name/type-index))
290                                (:include constant))
291  "Structure holding information on a member reference type item
292(a field, method or interface method reference) in the constant pool."
293  class-index
294  name/type-index)
295
296(declaim (inline make-constant-field-ref make-constant-method-ref
297                 make-constant-interface-method-ref))
298(defun make-constant-field-ref (index class-index name/type-index)
299  "Creates a `constant-member-ref' instance containing a field reference."
300  (%make-constant-member-ref 9 index class-index name/type-index))
301
302(defun make-constant-method-ref (index class-index name/type-index)
303  "Creates a `constant-member-ref' instance containing a method reference."
304  (%make-constant-member-ref 10 index class-index name/type-index))
305
306(defun make-constant-interface-method-ref (index class-index name/type-index)
307  "Creates a `constant-member-ref' instance containing an
308interface-method reference."
309  (%make-constant-member-ref 11 index class-index name/type-index))
310
311(defstruct (constant-string (:constructor
312                             make-constant-string (index value-index))
313                            (:include constant
314                                      (tag 8)))
315  "Structure holding information on a 'string' type item in the constant pool."
316  value-index)
317
318(defstruct (constant-float/int (:constructor
319                                %make-constant-float/int (tag index value))
320                               (:include constant))
321  "Structure holding information on a 'float' or 'integer' type item
322in the constant pool."
323  value)
324
325(declaim (inline make-constant-float make-constant-int))
326(defun make-constant-float (index value)
327  "Creates a `constant-float/int' structure instance containing a float."
328  (%make-constant-float/int 4 index value))
329
330(defun make-constant-int (index value)
331  "Creates a `constant-float/int' structure instance containing an int."
332  (%make-constant-float/int 3 index value))
333
334(defstruct (constant-double/long (:constructor
335                                  %make-constant-double/long (tag index value))
336                                 (:include constant))
337  "Structure holding information on a 'double' or 'long' type item
338in the constant pool."
339  value)
340
341(declaim (inline make-constant-double make-constant-float))
342(defun make-constant-double (index value)
343  "Creates a `constant-double/long' structure instance containing a double."
344  (%make-constant-double/long 6 index value))
345
346(defun make-constant-long (index value)
347  "Creates a `constant-double/long' structure instance containing a long."
348  (%make-constant-double/long 5 index value))
349
350(defstruct (constant-name/type (:constructor
351                                make-constant-name/type (index
352                                                         name-index
353                                                         descriptor-index))
354                               (:include constant
355                                         (tag 12)))
356  "Structure holding information on a 'name-and-type' type item in the
357constant pool; this type of element is used by 'member-ref' type items."
358  name-index
359  descriptor-index)
360
361(defstruct (constant-utf8 (:constructor make-constant-utf8 (index value))
362                          (:include constant
363                                    (tag 1)))
364  "Structure holding information on a 'utf8' type item in the constant pool;
365
366This type of item is used for text representation of identifiers
367and string contents."
368  value)
369
370
371(defun pool-add-class (pool class)
372  "Returns the index of the constant-pool class item for `class'.
373
374`class' must be an instance of `class-name'."
375  (let ((entry (gethash class (pool-entries pool))))
376    (unless entry
377      (let ((utf8 (pool-add-utf8 pool (class-name-internal class))))
378        (setf entry
379              (make-constant-class (incf (pool-index pool)) utf8)
380              (gethash class (pool-entries pool)) entry))
381      (push entry (pool-entries-list pool)))
382    (constant-index entry)))
383
384(defun pool-add-field-ref (pool class name type)
385  "Returns the index of the constant-pool item which denotes a reference
386to the `name' field of the `class', being of `type'.
387
388`class' should be an instance of `class-name'.
389`name' is a string.
390`type' is a field-type (see `internal-field-type')"
391  (let ((entry (gethash (acons name type class) (pool-entries pool))))
392    (unless entry
393      (let ((c (pool-add-class pool class))
394            (n/t (pool-add-name/type pool name type)))
395        (setf entry (make-constant-field-ref (incf (pool-index pool)) c n/t)
396            (gethash (acons name type class) (pool-entries pool)) entry))
397      (push entry (pool-entries-list pool)))
398    (constant-index entry)))
399
400(defun pool-add-method-ref (pool class name type)
401  "Returns the index of the constant-pool item which denotes a reference
402to the method with `name' in `class', which is of `type'.
403
404Here, `type' is a method descriptor, which defines the argument types
405and return type. `class' is an instance of `class-name'."
406  (let ((entry (gethash (acons name type class) (pool-entries pool))))
407    (unless entry
408      (let ((c (pool-add-class pool class))
409            (n/t (pool-add-name/type pool name type)))
410        (setf entry (make-constant-method-ref (incf (pool-index pool)) c n/t)
411              (gethash (acons name type class) (pool-entries pool)) entry))
412      (push entry (pool-entries-list pool)))
413    (constant-index entry)))
414
415(defun pool-add-interface-method-ref (pool class name type)
416  "Returns the index of the constant-pool item which denotes a reference to
417the method `name' in the interface `class', which is of `type'.
418
419See `pool-add-method-ref' for remarks."
420  (let ((entry (gethash (acons name type class) (pool-entries pool))))
421    (unless entry
422      (let ((c (pool-add-class pool class))
423            (n/t (pool-add-name/type pool name type)))
424        (setf entry
425            (make-constant-interface-method-ref (incf (pool-index pool)) c n/t)
426            (gethash (acons name type class) (pool-entries pool)) entry))
427      (push entry (pool-entries-list pool)))
428    (constant-index entry)))
429
430(defun pool-add-string (pool string)
431  "Returns the index of the constant-pool item denoting the string."
432  (let ((entry (gethash (cons 8 string) ;; 8 == string-tag
433                        (pool-entries pool))))
434    (unless entry
435      (let ((utf8 (pool-add-utf8 pool string)))
436        (setf entry (make-constant-string (incf (pool-index pool)) utf8)
437              (gethash (cons 8 string) (pool-entries pool)) entry))
438      (push entry (pool-entries-list pool)))
439    (constant-index entry)))
440
441(defun pool-add-int (pool int)
442  "Returns the index of the constant-pool item denoting the int."
443  (let ((entry (gethash (cons 3 int) (pool-entries pool))))
444    (unless entry
445      (setf entry (make-constant-int (incf (pool-index pool)) int)
446            (gethash (cons 3 int) (pool-entries pool)) entry)
447      (push entry (pool-entries-list pool)))
448    (constant-index entry)))
449
450(defun pool-add-float (pool float)
451  "Returns the index of the constant-pool item denoting the float."
452  (let ((entry (gethash (cons 4 float) (pool-entries pool))))
453    (unless entry
454      (setf entry (make-constant-float (incf (pool-index pool))
455                                       (sys::%float-bits float))
456            (gethash (cons 4 float) (pool-entries pool)) entry)
457      (push entry (pool-entries-list pool)))
458    (constant-index entry)))
459
460(defun pool-add-long (pool long)
461  "Returns the index of the constant-pool item denoting the long."
462  (let ((entry (gethash (cons 5 long) (pool-entries pool))))
463    (unless entry
464      (setf entry (make-constant-long (incf (pool-index pool)) long)
465            (gethash (cons 5 long) (pool-entries pool)) entry)
466      (push entry (pool-entries-list pool))
467      (incf (pool-index pool))) ;; double index increase; long takes 2 slots
468    (constant-index entry)))
469
470(defun pool-add-double (pool double)
471  "Returns the index of the constant-pool item denoting the double."
472  (let ((entry (gethash (cons 6 double) (pool-entries pool))))
473    (unless entry
474      (setf entry (make-constant-double (incf (pool-index pool))
475                                        (sys::%float-bits double))
476            (gethash (cons 6 double) (pool-entries pool)) entry)
477      (push entry (pool-entries-list pool))
478      (incf (pool-index pool))) ;; double index increase; 'double' takes 2 slots
479    (constant-index entry)))
480
481(defun pool-add-name/type (pool name type)
482  "Returns the index of the constant-pool item denoting
483the name/type identifier."
484  (let ((entry (gethash (cons name type) (pool-entries pool)))
485        (internal-type (if (listp type)
486                           (apply #'descriptor type)
487                           (internal-field-ref type))))
488    (unless entry
489      (let ((n (pool-add-utf8 pool name))
490            (i-t (pool-add-utf8 pool internal-type)))
491        (setf entry (make-constant-name/type (incf (pool-index pool)) n i-t)
492              (gethash (cons name type) (pool-entries pool)) entry))
493      (push entry (pool-entries-list pool)))
494    (constant-index entry)))
495
496(defun pool-add-utf8 (pool utf8-as-string)
497  "Returns the index of the textual value that will be stored in the
498class file as UTF-8 encoded data."
499  (let ((entry (gethash (cons 11 utf8-as-string) ;; 11 == utf8
500                        (pool-entries pool))))
501    (unless entry
502      (setf entry (make-constant-utf8 (incf (pool-index pool)) utf8-as-string)
503            (gethash (cons 11 utf8-as-string) (pool-entries pool)) entry)
504      (push entry (pool-entries-list pool)))
505    (constant-index entry)))
506
507(defstruct (class-file (:constructor
508                        make-class-file (class superclass access-flags)))
509  "Holds the components of a class file."
510  (constants (make-pool))
511  access-flags
512  class
513  superclass
514  ;; support for implementing interfaces not yet available
515  ;; interfaces
516  fields
517  methods
518  attributes)
519
520(defun class-add-field (class field)
521  "Adds a `field' created by `make-field'."
522  (push field (class-file-fields class)))
523
524(defun class-field (class name)
525  "Finds a field by name." ;; ### strictly speaking, a field is uniquely
526  ;; identified by its name and type, not by the name alone.
527  (find name (class-file-fields class)
528        :test #'string= :key #'field-name))
529
530(defun class-add-method (class method)
531  "Adds a `method' to `class'; the method must have been created using
532`make-method'."
533  (push method (class-file-methods class)))
534
535(defun class-methods-by-name (class name)
536  "Returns all methods which have `name'."
537  (remove (map-method-name name) (class-file-methods class)
538          :test-not #'string= :key #'method-name))
539
540(defun class-method (class name return &rest args)
541  "Return the method which is (uniquely) identified by its name AND descriptor."
542  (let ((return-and-args (cons return args))
543        (name (map-method-name name)))
544    (find-if #'(lambda (c)
545                 (and (string= (method-name c) name)
546                      (equal (method-descriptor c) return-and-args)))
547             (class-file-methods class))))
548
549(defun class-add-attribute (class attribute)
550  "Adds `attribute' to the class; attributes must be instances of
551structure classes which include the `attribute' structure class."
552  (push attribute (class-file-attributes class)))
553
554(defun class-attribute (class name)
555  "Returns the attribute which is named `name'."
556  (find name (class-file-attributes class)
557        :test #'string= :key #'attribute-name))
558
559
560(defun finalize-class-file (class)
561  "Transforms the representation of the class-file from one
562which allows easy modification to one which works best for serialization.
563
564The class can't be modified after finalization."
565
566  ;; constant pool contains constants finalized on addition;
567  ;; no need for additional finalization
568
569  (setf (class-file-access-flags class)
570        (map-flags (class-file-access-flags class)))
571  (setf (class-file-superclass class)
572        (pool-add-class (class-file-constants class)
573                        (class-file-superclass class))
574        (class-file-class class)
575        (pool-add-class (class-file-constants class)
576                        (class-file-class class)))
577  ;;  (finalize-interfaces)
578  (dolist (field (class-file-fields class))
579    (finalize-field field class))
580  (dolist (method (class-file-methods class))
581    (finalize-method method class))
582  ;; top-level attributes (no parent attributes to refer to)
583  (finalize-attributes (class-file-attributes class) nil class))
584
585
586(declaim (inline write-u1 write-u2 write-u4 write-s4))
587(defun write-u1 (n stream)
588  (declare (optimize speed))
589  (declare (type (unsigned-byte 8) n))
590  (declare (type stream stream))
591  (write-8-bits n stream))
592
593(defknown write-u2 (t t) t)
594(defun write-u2 (n stream)
595  (declare (optimize speed))
596  (declare (type (unsigned-byte 16) n))
597  (declare (type stream stream))
598  (write-8-bits (logand (ash n -8) #xFF) stream)
599  (write-8-bits (logand n #xFF) stream))
600
601(defknown write-u4 (integer stream) t)
602(defun write-u4 (n stream)
603  (declare (optimize speed))
604  (declare (type (unsigned-byte 32) n))
605  (write-u2 (logand (ash n -16) #xFFFF) stream)
606  (write-u2 (logand n #xFFFF) stream))
607
608(declaim (ftype (function (t t) t) write-s4))
609(defun write-s4 (n stream)
610  (declare (optimize speed))
611  (cond ((minusp n)
612         (write-u4 (1+ (logxor (- n) #xFFFFFFFF)) stream))
613        (t
614         (write-u4 n stream))))
615
616(declaim (ftype (function (t t t) t) write-ascii))
617(defun write-ascii (string length stream)
618  (declare (type string string))
619  (declare (type (unsigned-byte 16) length))
620  (declare (type stream stream))
621  (write-u2 length stream)
622  (dotimes (i length)
623    (declare (type (unsigned-byte 16) i))
624    (write-8-bits (char-code (char string i)) stream)))
625
626
627(declaim (ftype (function (t t) t) write-utf8))
628(defun write-utf8 (string stream)
629  (declare (optimize speed))
630  (declare (type string string))
631  (declare (type stream stream))
632  (let ((length (length string))
633        (must-convert nil))
634    (declare (type fixnum length))
635    (dotimes (i length)
636      (declare (type fixnum i))
637      (unless (< 0 (char-code (char string i)) #x80)
638        (setf must-convert t)
639        (return)))
640    (if must-convert
641        (let ((octets (make-array (* length 2)
642                                  :element-type '(unsigned-byte 8)
643                                  :adjustable t
644                                  :fill-pointer 0)))
645          (declare (type (vector (unsigned-byte 8)) octets))
646          (dotimes (i length)
647            (declare (type fixnum i))
648            (let* ((c (char string i))
649                   (n (char-code c)))
650              (cond ((zerop n)
651                     (vector-push-extend #xC0 octets)
652                     (vector-push-extend #x80 octets))
653                    ((< 0 n #x80)
654                     (vector-push-extend n octets))
655                    (t
656                     (let ((char-octets (char-to-utf8 c)))
657                       (dotimes (j (length char-octets))
658                         (declare (type fixnum j))
659                         (vector-push-extend (svref char-octets j) octets)))))))
660          (write-u2 (length octets) stream)
661          (dotimes (i (length octets))
662            (declare (type fixnum i))
663            (write-8-bits (aref octets i) stream)))
664        (write-ascii string length stream))))
665
666
667(defun write-class-file (class stream)
668  "Serializes `class' to `stream', after it has been finalized."
669
670  ;; header
671  (write-u4 #xCAFEBABE stream)
672  (write-u2 3 stream)
673  (write-u2 45 stream)
674
675   ;; constants pool
676  (write-constants (class-file-constants class) stream)
677  ;; flags
678  (write-u2  (class-file-access-flags class) stream)
679
680  ;; class name
681  (write-u2 (class-file-class class) stream)
682
683  ;; superclass
684  (write-u2 (class-file-superclass class) stream)
685
686  ;; interfaces
687  (write-u2 0 stream)
688
689  ;; fields
690  (write-u2 (length (class-file-fields class)) stream)
691  (dolist (field (class-file-fields class))
692    (write-field field stream))
693
694  ;; methods
695  (write-u2 (length (class-file-methods class)) stream)
696  (dolist (method (class-file-methods class))
697    (write-method method stream))
698
699  ;; attributes
700  (write-attributes (class-file-attributes class) stream))
701
702
703(defvar *jvm-class-debug-pool* nil
704  "When bound to a non-NIL value, enables output to *standard-output*
705to allow debugging output of the constant section of the class file.")
706
707(defun write-constants (constants stream)
708  "Writes the constant section given in `constants' to the class file `stream'."
709  (let ((pool-index 0))
710    (write-u2 (1+ (pool-index constants)) stream)
711    (when *jvm-class-debug-pool*
712      (sys::%format t "pool count ~A~%" (pool-index constants)))
713    (dolist (entry (reverse (pool-entries-list constants)))
714      (incf pool-index)
715      (let ((tag (constant-tag entry)))
716        (when *jvm-class-debug-pool*
717          (print-constant entry t))
718        (write-u1 tag stream)
719        (case tag
720          (1                            ; UTF8
721           (write-utf8 (constant-utf8-value entry) stream))
722          ((3 4)                        ; float int
723           (write-u4 (constant-float/int-value entry) stream))
724          ((5 6)                        ; long double
725           (write-u4 (logand (ash (constant-double/long-value entry) -32)
726                             #xFFFFffff) stream)
727           (write-u4 (logand (constant-double/long-value entry) #xFFFFffff)
728                     stream))
729          ((9 10 11)           ; fieldref methodref InterfaceMethodref
730           (write-u2 (constant-member-ref-class-index entry) stream)
731           (write-u2 (constant-member-ref-name/type-index entry) stream))
732          (12                           ; nameAndType
733           (write-u2 (constant-name/type-name-index entry) stream)
734           (write-u2 (constant-name/type-descriptor-index entry) stream))
735          (7                            ; class
736           (write-u2 (constant-class-name-index entry) stream))
737          (8                            ; string
738           (write-u2 (constant-string-value-index entry) stream))
739          (t
740           (error "write-constant-pool-entry unhandled tag ~D~%" tag)))))))
741
742
743(defun print-constant (entry stream)
744  "Debugging helper to print the content of a constant-pool entry."
745  (let ((tag (constant-tag entry))
746        (index (constant-index entry)))
747    (sys::%format stream "pool element ~a, tag ~a, " index tag)
748    (case tag
749      (1     (sys::%format t "utf8: ~a~%" (constant-utf8-value entry)))
750      ((3 4) (sys::%format t "f/i: ~a~%" (constant-float/int-value entry)))
751      ((5 6) (sys::%format t "d/l: ~a~%" (constant-double/long-value entry)))
752      ((9 10 11) (sys::%format t "ref: ~a,~a~%"
753                               (constant-member-ref-class-index entry)
754                               (constant-member-ref-name/type-index entry)))
755      (12 (sys::%format t "n/t: ~a,~a~%"
756                        (constant-name/type-name-index entry)
757                        (constant-name/type-descriptor-index entry)))
758      (7 (sys::%format t "cls: ~a~%" (constant-class-name-index entry)))
759      (8 (sys::%format t "str: ~a~%" (constant-string-value-index entry))))))
760
761
762#|
763
764ABCL doesn't use interfaces, so don't implement it here at this time
765
766(defstruct interface)
767
768|#
769
770
771(defparameter +access-flags-map+
772  '((:public       #x0001)
773    (:private      #x0002)
774    (:protected    #x0004)
775    (:static       #x0008)
776    (:final        #x0010)
777    (:volatile     #x0040)
778    (:synchronized #x0020)
779    (:transient    #x0080)
780    (:native       #x0100)
781    (:abstract     #x0400)
782    (:strict       #x0800))
783  "List of keyword symbols used for human readable representation of (access)
784flags and their binary values.")
785
786(defun map-flags (flags)
787  "Calculates the bitmap of the flags from a list of symbols."
788  (reduce #'(lambda (y x)
789              (logior (or (when (member (car x) flags)
790                            (second x))
791                          0) y))
792          +access-flags-map+
793          :initial-value 0))
794
795(defstruct (field (:constructor %make-field))
796  "Holds information on the properties of fields in the class(-file)."
797  access-flags
798  name
799  descriptor
800  attributes)
801
802(defun make-field (name type &key (flags '(:public)))
803  "Creates a field for addition to a class file."
804  (%make-field :access-flags flags
805               :name name
806               :descriptor type))
807
808(defun field-add-attribute (field attribute)
809  "Adds an attribute to a field."
810  (push attribute (field-attributes field)))
811
812(defun field-attribute (field name)
813  "Retrieves an attribute named `name' of `field'.
814
815Returns NIL if the attribute isn't found."
816  (find name (field-attributes field)
817        :test #'string= :key #'attribute-name))
818
819(defun finalize-field (field class)
820  "Prepares `field' for serialization."
821  (let ((pool (class-file-constants class)))
822    (setf (field-access-flags field)
823          (map-flags (field-access-flags field))
824          (field-descriptor field)
825          (pool-add-utf8 pool (internal-field-ref (field-descriptor field)))
826          (field-name field)
827          (pool-add-utf8 pool (field-name field))))
828  (finalize-attributes (field-attributes field) nil class))
829
830(defun write-field (field stream)
831  "Writes classfile representation of `field' to `stream'."
832  (write-u2 (field-access-flags field) stream)
833  (write-u2 (field-name field) stream)
834  (write-u2 (field-descriptor field) stream)
835  (write-attributes (field-attributes field) stream))
836
837
838(defstruct (jvm-method (:constructor %make-jvm-method)
839           (:conc-name method-))
840  "Holds information on the properties of methods in the class(-file)."
841  access-flags
842  name
843  descriptor
844  attributes)
845
846
847(defun map-method-name (name)
848  "Methods should be identified by strings containing their names, or,
849be one of two keyword identifiers to identify special methods:
850
851 * :static-initializer
852 * :constructor
853"
854  (cond
855    ((eq name :static-initializer)
856     "<clinit>")
857    ((eq name :constructor)
858     "<init>")
859    (t name)))
860
861(defun make-jvm-method (name return args &key (flags '(:public)))
862  "Creates a method for addition to a class file."
863  (%make-jvm-method :descriptor (cons return args)
864        :access-flags flags
865        :name (map-method-name name)))
866
867(defun method-add-attribute (method attribute)
868  "Add `attribute' to the list of attributes of `method',
869returning `attribute'."
870  (push attribute (method-attributes method))
871  attribute)
872
873(defun method-add-code (method)
874  "Creates an (empty) 'Code' attribute for the method,
875returning the created attribute."
876  (method-add-attribute
877   method
878   (make-code-attribute (+ (length (cdr (method-descriptor method)))
879                           (if (member :static (method-access-flags method))
880                               0 1))))) ;; 1 == implicit 'this'
881
882(defun method-ensure-code (method)
883  "Ensures the existence of a 'Code' attribute for the method,
884returning the attribute."
885  (let ((code (method-attribute method "Code")))
886    (if (null code)
887        (method-add-code method)
888        code)))
889
890(defun method-attribute (method name)
891  "Returns the first attribute of `method' with `name'."
892  (find name (method-attributes method)
893        :test #'string= :key #'attribute-name))
894
895
896(defun finalize-method (method class)
897  "Prepares `method' for serialization."
898  (let ((pool (class-file-constants class)))
899    (setf (method-access-flags method)
900          (map-flags (method-access-flags method))
901          (method-descriptor method)
902          (pool-add-utf8 pool (apply #'descriptor (method-descriptor method)))
903          (method-name method)
904          (pool-add-utf8 pool (method-name method))))
905  (finalize-attributes (method-attributes method) nil class))
906
907
908(defun write-method (method stream)
909  "Write class file representation of `method' to `stream'."
910  (write-u2 (method-access-flags method) stream)
911  (write-u2 (method-name method) stream)
912  ;;(sys::%format t "method-name: ~a~%" (method-name method))
913  (write-u2 (method-descriptor method) stream)
914  (write-attributes (method-attributes method) stream))
915
916(defstruct attribute
917  "Parent attribute structure to be included into other attributes, mainly
918to define common fields.
919
920Having common fields allows common driver code for
921finalizing and serializing attributes."
922  name
923
924  ;; not in the class file:
925  finalizer  ;; function of 3 arguments: the attribute, parent and class-file
926  writer     ;; function of 2 arguments: the attribute and the output stream
927  )
928
929(defun finalize-attributes (attributes att class)
930  "Prepare `attributes' (a list) of attribute `att' list for serialization."
931  (dolist (attribute attributes)
932    ;; assure header: make sure 'name' is in the pool
933    (setf (attribute-name attribute)
934          (pool-add-utf8 (class-file-constants class)
935                         (attribute-name attribute)))
936    ;; we're saving "root" attributes: attributes which have no parent
937    (funcall (attribute-finalizer attribute) attribute att class)))
938
939(defun write-attributes (attributes stream)
940  "Writes the `attributes' to `stream'."
941  (write-u2 (length attributes) stream)
942  (dolist (attribute attributes)
943    (write-u2 (attribute-name attribute) stream)
944    ;; set up a bulk catcher for (UNSIGNED-BYTE 8)
945    ;; since we need to know the attribute length (excluding the header)
946    (let ((local-stream (sys::%make-byte-array-output-stream)))
947      (funcall (attribute-writer attribute) attribute local-stream)
948      (let ((array (sys::%get-output-stream-array local-stream)))
949        (write-u4 (length array) stream)
950        (write-sequence array stream)))))
951
952
953
954(defstruct (code-attribute (:conc-name code-)
955                           (:include attribute
956                                     (name "Code")
957                                     (finalizer #'finalize-code-attribute)
958                                     (writer #'write-code-attribute))
959                           (:constructor %make-code-attribute))
960  "The attribute containing the actual JVM byte code;
961an attribute of a method."
962  max-stack
963  max-locals
964  code
965  exception-handlers
966  attributes
967
968  ;; fields not in the class file start here
969
970  ;; labels contains offsets into the code array after it's finalized
971  labels ;; an alist
972
973  (current-local 0)) ;; used for handling nested WITH-CODE-TO-METHOD blocks
974
975
976
977(defun code-label-offset (code label)
978  "Retrieves the `label' offset within a `code' attribute after the
979attribute has been finalized."
980  (cdr (assoc label (code-labels code))))
981
982(defun (setf code-label-offset) (offset code label)
983  "Sets the `label' offset within a `code' attribute after the attribute
984has been finalized."
985  (setf (code-labels code)
986        (acons label offset (code-labels code))))
987
988(defun finalize-code-attribute (code parent class)
989  "Prepares the `code' attribute for serialization, within method `parent'."
990  (declare (ignore parent))
991  (let* ((handlers (code-exception-handlers code))
992         (c (finalize-code
993                     (code-code code)
994                     (nconc (mapcar #'exception-start-pc handlers)
995                            (mapcar #'exception-end-pc handlers)
996                            (mapcar #'exception-handler-pc handlers))
997                     t)))
998    (unless (code-max-stack code)
999      (setf (code-max-stack code)
1000            (analyze-stack c (mapcar #'exception-handler-pc handlers))))
1001    (unless (code-max-locals code)
1002      (setf (code-max-locals code)
1003            (analyze-locals code)))
1004    (multiple-value-bind
1005          (c labels)
1006        (code-bytes c)
1007      (setf (code-code code) c
1008            (code-labels code) labels)))
1009
1010  (setf (code-exception-handlers code)
1011        (remove-if #'(lambda (h)
1012                       (eql (code-label-offset code (exception-start-pc h))
1013                            (code-label-offset code (exception-end-pc h))))
1014                   (code-exception-handlers code)))
1015
1016  (dolist (exception (code-exception-handlers code))
1017    (setf (exception-start-pc exception)
1018          (code-label-offset code (exception-start-pc exception))
1019          (exception-end-pc exception)
1020          (code-label-offset code (exception-end-pc exception))
1021          (exception-handler-pc exception)
1022          (code-label-offset code (exception-handler-pc exception))
1023          (exception-catch-type exception)
1024          (if (null (exception-catch-type exception))
1025              0  ;; generic 'catch all' class index number
1026              (pool-add-class (class-file-constants class)
1027                              (exception-catch-type exception)))))
1028
1029  (finalize-attributes (code-attributes code) code class))
1030
1031(defun write-code-attribute (code stream)
1032  "Writes the attribute `code' to `stream'."
1033  ;;(sys::%format t "max-stack: ~a~%" (code-max-stack code))
1034  (write-u2 (code-max-stack code) stream)
1035  ;;(sys::%format t "max-locals: ~a~%" (code-max-locals code))
1036  (write-u2 (code-max-locals code) stream)
1037  (let ((code-array (code-code code)))
1038    ;;(sys::%format t "length: ~a~%" (length code-array))
1039    (write-u4 (length code-array) stream)
1040    (dotimes (i (length code-array))
1041      (write-u1 (svref code-array i) stream)))
1042
1043  (write-u2 (length (code-exception-handlers code)) stream)
1044  (dolist (exception (reverse (code-exception-handlers code)))
1045    ;;(sys::%format t "start-pc: ~a~%" (exception-start-pc exception))
1046    (write-u2 (exception-start-pc exception) stream)
1047    ;;(sys::%format t "end-pc: ~a~%" (exception-end-pc exception))
1048    (write-u2 (exception-end-pc exception) stream)
1049    ;;(sys::%format t "handler-pc: ~a~%" (exception-handler-pc exception))
1050    (write-u2 (exception-handler-pc exception) stream)
1051    (write-u2 (exception-catch-type exception) stream))
1052
1053  (write-attributes (code-attributes code) stream))
1054
1055(defun make-code-attribute (arg-count)
1056  "Creates an empty 'Code' attribute for a method which takes
1057`arg-count` parameters, including the implicit `this` parameter."
1058  (%make-code-attribute :max-locals arg-count))
1059
1060(defun code-add-attribute (code attribute)
1061  "Adds `attribute' to `code', returning `attribute'."
1062  (push attribute (code-attributes code))
1063  attribute)
1064
1065(defun code-attribute (code name)
1066  "Returns an attribute of `code' identified by `name'."
1067  (find name (code-attributes code)
1068        :test #'string= :key #'attribute-name))
1069
1070
1071(defun code-add-exception-handler (code start end handler type)
1072  "Adds an exception handler to `code' protecting the region from
1073labels `start' to `end' (inclusive) from exception `type' - where
1074a value of NIL indicates all types. Upon an exception of the given
1075type, control is transferred to label `handler'."
1076  (push (make-exception :start-pc start
1077                        :end-pc end
1078                        :handler-pc handler
1079                        :catch-type type)
1080        (code-exception-handlers code)))
1081
1082(defstruct exception
1083  "Exception handler information.
1084
1085After finalization, the fields contain offsets instead of labels."
1086  start-pc    ;; label target
1087  end-pc      ;; label target
1088  handler-pc  ;; label target
1089  catch-type  ;; a string for a specific type, or NIL for all
1090  )
1091
1092
1093(defstruct (constant-value-attribute (:conc-name constant-value-)
1094                                     (:include attribute
1095                                               (name "ConstantValue")
1096                                               ;; finalizer
1097                                               ;; writer
1098                                               ))
1099  "An attribute of a field of primitive type.
1100
1101"
1102  ;;; ### TODO
1103  )
1104
1105
1106(defstruct (checked-exceptions-attribute
1107             (:conc-name checked-)
1108             (:include attribute
1109                       (name "Exceptions")
1110                       (finalizer #'finalize-checked-exceptions)
1111                       (writer #'write-checked-exceptions)))
1112  "An attribute of `code-attribute', "
1113  table ;; a list of checked classes corresponding to Java's 'throws'
1114)
1115
1116(defun finalize-checked-exceptions (checked-exceptions code class)
1117  (declare (ignorable code class))
1118
1119  "Prepare `checked-exceptions' for serialization."
1120  (setf (checked-table checked-exceptions)
1121        (mapcar #'(lambda (exception)
1122                    (pool-add-class (class-file-constants class)
1123                                    exception))
1124                (checked-table checked-exceptions))))
1125
1126(defun write-checked-exceptions (checked-exceptions stream)
1127  "Write `checked-exceptions' to `stream' in class file representation."
1128  (write-u2 (length (checked-table checked-exceptions)) stream)
1129  (dolist (exception (reverse (checked-table checked-exceptions)))
1130    (write-u2 exception stream)))
1131
1132;; Can't be used yet: serialization missing
1133(defstruct (deprecated-attribute (:include attribute
1134                                           (name "Deprecated")
1135                                           (finalizer (constantly nil))
1136                                           (writer (constantly nil))))
1137  ;; finalizer and writer need to do nothing: Deprecated attributes are empty
1138  "An attribute of a class file, field or method, indicating the element
1139to which it has been attached has been superseded.")
1140
1141(defvar *current-code-attribute* nil)
1142(defvar *method*)
1143
1144(defun save-code-specials (code)
1145  (setf (code-code code) *code*
1146        (code-max-locals code) *registers-allocated*
1147        (code-current-local code) *register*))
1148
1149(defun restore-code-specials (code)
1150  (setf *code* (code-code code)
1151        *registers-allocated* (code-max-locals code)
1152        *register* (code-current-local code)))
1153
1154(defmacro with-code-to-method ((class-file method)
1155                               &body body)
1156  (let ((m (gensym))
1157        (c (gensym)))
1158    `(progn
1159       (when *current-code-attribute*
1160         (save-code-specials *current-code-attribute*))
1161       (let* ((,m ,method)
1162              (*method* ,m)
1163              (,c (method-ensure-code ,method))
1164              (*pool* (class-file-constants ,class-file))
1165              (*code* (code-code ,c))
1166              (*registers-allocated* (code-max-locals ,c))
1167              (*register* (code-current-local ,c))
1168              (*current-code-attribute* ,c))
1169         ,@body
1170         (setf (code-code ,c) *code*
1171               (code-current-local ,c) *register*
1172               (code-max-locals ,c) *registers-allocated*))
1173       (when *current-code-attribute*
1174         (restore-code-specials *current-code-attribute*)))))
1175
1176
1177(defstruct (source-file-attribute (:conc-name source-)
1178                                  (:include attribute
1179                                            (name "SourceFile")
1180                                            (finalizer #'finalize-source-file)
1181                                            (writer #'write-source-file)))
1182  "An attribute of the class file indicating which source file
1183it was compiled from."
1184  filename)
1185
1186(defun finalize-source-file (source-file code class)
1187  (declare (ignorable code class))
1188  (setf (source-filename source-file)
1189        (pool-add-utf8 (class-file-constants class)
1190                       (source-filename source-file))))
1191
1192(defun write-source-file (source-file stream)
1193  (write-u2 (source-filename source-file) stream))
1194
1195
1196(defstruct (synthetic-attribute (:include attribute
1197                                          (name "Synthetic")
1198                                          (finalizer (constantly nil))
1199                                          (writer (constantly nil))))
1200  ;; finalizer and writer need to do nothing: Synthetic attributes are empty
1201  "An attribute of a class file, field or method to mark that it wasn't
1202included in the sources - but was generated artificially.")
1203
1204
1205(defstruct (line-numbers-attribute
1206             (:conc-name line-numbers-)
1207             (:include attribute
1208                       (name "LineNumberTable")
1209                       (finalizer #'finalize-line-numbers)
1210                       (writer #'write-line-numbers)))
1211  "An attribute of `code-attribute', containing a mapping of offsets
1212within the code section to the line numbers in the source file."
1213  table ;; a list of line-number structures, in reverse order
1214  )
1215
1216(defstruct line-number
1217  start-pc  ;; a label, before finalization, or 0 for "start of function"
1218  line)
1219
1220(defun finalize-line-numbers (line-numbers code class)
1221  (declare (ignorable code class))
1222  (dolist (line-number (line-numbers-table line-numbers))
1223    (unless (zerop (line-number-start-pc line-number))
1224      (setf (line-number-start-pc line-number)
1225            (code-label-offset code (line-number-start-pc line-number))))))
1226
1227(defun write-line-numbers (line-numbers stream)
1228  (write-u2 (length (line-numbers-table line-numbers)) stream)
1229  (dolist (line-number (reverse (line-numbers-table line-numbers)))
1230    (write-u2 (line-number-start-pc line-number) stream)
1231    (write-u2 (line-number-line line-number) stream)))
1232
1233(defun line-numbers-add-line (line-numbers start-pc line)
1234  (push (make-line-number :start-pc start-pc :line line)
1235        (line-numbers-table line-numbers)))
1236
1237(defstruct (local-variables-attribute
1238             (:conc-name local-var-)
1239             (:include attribute
1240                       (name "LocalVariableTable")
1241                       (finalizer #'finalize-local-variables)
1242                       (writer #'write-local-variables)))
1243  "An attribute of the `code-attribute', containing a table of local variable
1244names, their type and their scope of validity."
1245  table ;; a list of local-variable structures, in reverse order
1246  )
1247
1248(defstruct (local-variable (:conc-name local-))
1249  start-pc  ;; a label, before finalization
1250  length    ;; a label (at the ending position) before finalization
1251  name
1252  descriptor
1253  index ;; The index of the variable inside the block of locals
1254  )
1255
1256(defun finalize-local-variables (local-variables code class)
1257  (dolist (local-variable (local-var-table local-variables))
1258    (setf (local-start-pc local-variable)
1259          (code-label-offset code (local-start-pc local-variable))
1260          (local-length local-variable)
1261          ;; calculate 'length' from the distance between 2 labels
1262          (- (code-label-offset code (local-length local-variable))
1263             (local-start-pc local-variable))
1264          (local-name local-variable)
1265          (pool-add-utf8 (class-file-constants class)
1266                         (local-name local-variable))
1267          (local-descriptor local-variable)
1268          (pool-add-utf8 (class-file-constants class)
1269                         (local-descriptor local-variable)))))
1270
1271(defun write-local-variables (local-variables stream)
1272  (write-u2 (length (local-var-table local-variables)) stream)
1273  (dolist (local-variable (reverse (local-var-table local-variables)))
1274    (write-u2 (local-start-pc local-variable) stream)
1275    (write-u2 (local-length local-variable) stream)
1276    (write-u2 (local-name local-variable) stream)
1277    (write-u2 (local-descriptor local-variable) stream)
1278    (write-u2 (local-index local-variable) stream)))
1279
1280#|
1281
1282;; this is the minimal sequence we need to support:
1283
1284;;  create a class file structure
1285;;  add methods
1286;;  add code to the methods, switching from one method to the other
1287;;  finalize the methods, one by one
1288;;  write the class file
1289
1290to support the sequence above, we probably need to
1291be able to
1292
1293- find methods by signature
1294- find the method's code attribute
1295- add code to the code attribute
1296- finalize the code attribute contents (blocking it for further addition)
1297-
1298
1299
1300|#
1301
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