annotate src/alloca.s @ 4539:061e030e3270

Fix some bugs in load-history construction, built-in symbol file names. lib-src/ChangeLog addition: 2008-12-27 Aidan Kehoe <kehoea@parhasard.net> * make-docfile.c (main): Allow more than one -d argument, followed by a directory to change to. (put_filename): Don't strip directory information; with previous change, allows retrieval of Lisp function and variable origin files from #'built-in-symbol-file relative to lisp-directory. (scan_lisp_file): Don't add an extraneous newline after the file name, put_filename has added the newline already. lisp/ChangeLog addition: 2008-12-27 Aidan Kehoe <kehoea@parhasard.net> * loadup.el (load-history): Add the contents of current-load-list to load-history before clearing it. Move the variable declarations earlier in the file to a format understood by make-docfile.c. * custom.el (custom-declare-variable): Add the variable's symbol to the current file's load history entry correctly, don't use a cons. Eliminate a comment that we don't need to worry about, we don't need to check the `initialized' C variable in Lisp. * bytecomp.el (byte-compile-output-file-form): Merge Andreas Schwab's pre-GPLv3 GNU change of 19970831 here; treat #'custom-declare-variable correctly, generating the docstrings in a format understood by make-docfile.c. * loadhist.el (symbol-file): Correct behaviour for checking autoloaded macros and functions when supplied with a TYPE argument. Accept fully-qualified paths from #'built-in-symbol-file; if a path is not fully-qualified, return it relative to lisp-directory if the filename corresponds to a Lisp file, and relative to (concat source-directory "/src/") otherwise. * make-docfile.el (preloaded-file-list): Rationalise some let bindings a little. Use the "-d" argument to make-docfile.c to supply Lisp paths relative to lisp-directory, not absolutely. Add in loadup.el explicitly to the list of files to be processed by make-docfile.c--it doesn't make sense to add it to preloaded-file-list, since that is used for purposes of byte-compilation too. src/ChangeLog addition: 2008-12-27 Aidan Kehoe <kehoea@parhasard.net> * doc.c (Fbuilt_in_symbol_file): Return a subr's filename immediately if we've found it. Check for compiled function and compiled macro docstrings in DOC too, and return them if they exist. The branch of the if statement focused on functions may have executed, but we may still want to check variable bindings; an else clause isn't appropriate.
author Aidan Kehoe <kehoea@parhasard.net>
date Sat, 27 Dec 2008 14:05:50 +0000
parents 3ecd8885ac67
children aa5ed11f473b
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1 /* `alloca' standard 4.2 subroutine for 68000's and 16000's and others.
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2 Also has _setjmp and _longjmp for pyramids.
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3 Copyright (C) 1985, 1986, 1988 Free Software Foundation, Inc.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.30. */
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23
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24 /* Both 68000 systems I have run this on have had broken versions of alloca.
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25 Also, I am told that non-berkeley systems do not have it at all.
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26 So replace whatever system-provided alloca there may be
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27 on all 68000 systems. */
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28
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29 #define NOT_C_CODE
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30 #ifdef emacs
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31 #include <config.h>
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32 #else
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33 #include "config.h"
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34 #endif
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35
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36 #ifndef HAVE_ALLOCA /* define this to use system's alloca */
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37
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38 #ifndef hp9000s300
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39 #ifndef m68k
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40 #ifndef m68000
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41 #ifndef WICAT
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42 #ifndef ns32000
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43 #ifndef ns16000
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44 #ifndef sequent
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45 #ifndef pyramid
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46 #ifndef ATT3B5
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47 #ifndef XENIX
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48 you
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49 lose!!
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50 #endif /* XENIX */
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51 #endif /* ATT3B5 */
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52 #endif /* pyramid */
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53 #endif /* sequent */
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54 #endif /* ns16000 */
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55 #endif /* ns32000 */
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56 #endif /* WICAT */
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57 #endif /* m68000 */
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58 #endif /* m68k */
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59 #endif /* hp9000s300 */
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60
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61
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62 #ifdef hp9000s300
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63 #ifdef OLD_HP_ASSEMBLER
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64 data
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65 text
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66 globl _alloca
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67 _alloca
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68 move.l (sp)+,a0 ; pop return addr from top of stack
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69 move.l (sp)+,d0 ; pop size in bytes from top of stack
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70 add.l #ROUND,d0 ; round size up to long word
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71 and.l #MASK,d0 ; mask out lower two bits of size
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72 sub.l d0,sp ; allocate by moving stack pointer
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73 tst.b PROBE(sp) ; stack probe to allocate pages
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74 move.l sp,d0 ; return pointer
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75 add.l #-4,sp ; new top of stack
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76 jmp (a0) ; not a normal return
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77 MASK equ -4 ; Longword alignment
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78 ROUND equ 3 ; ditto
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79 PROBE equ -128 ; safety buffer for C compiler scratch
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80 data
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81 #else /* new hp assembler syntax */
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82 /*
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83 The new compiler does "move.m <registers> (%sp)" to save registers,
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84 so we must copy the saved registers when we mung the sp.
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85 The old compiler did "move.m <register> <offset>(%a6)", which
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86 gave us no trouble
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87 */
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88 text
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89 set PROBE,-128 # safety for C frame temporaries
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90 set MAXREG,22 # d2-d7, a2-a5, fp2-fp7 may have been saved
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91 global _alloca
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92 _alloca:
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93 mov.l (%sp)+,%a0 # return address
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94 mov.l (%sp)+,%d0 # number of bytes to allocate
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95 mov.l %sp,%a1 # save old sp for register copy
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96 mov.l %sp,%d1 # compute new sp
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97 sub.l %d0,%d1 # space requested
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98 and.l &-4,%d1 # round down to longword
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99 sub.l &MAXREG*4,%d1 # space for saving registers
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100 mov.l %d1,%sp # save new value of sp
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101 tst.b PROBE(%sp) # create pages (sigh)
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102 mov.l %a2,%d1 # save reg a2
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103 mov.l %sp,%a2
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104 move.w &MAXREG-1,%d0
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105 copy_regs_loop: /* save caller's saved registers */
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106 mov.l (%a1)+,(%a2)+
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107 dbra %d0,copy_regs_loop
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108 mov.l %a2,%d0 # return value
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109 mov.l %d1,%a2 # restore a2
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110 add.l &-4,%sp # adjust tos
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111 jmp (%a0) # rts
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112 #endif /* new hp assembler */
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113 #else
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114 #ifdef m68k /* SGS assembler totally different */
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115 file "alloca.s"
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116 global alloca
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117 alloca:
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118 #ifdef MOTOROLA_DELTA
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119 /* slightly modified version of alloca to motorola sysV/68 pcc - based
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120 compiler.
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121 this compiler saves used registers relative to %sp instead of %fp.
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122 alright, just make new copy of saved register set whenever we allocate
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123 new space from stack..
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124 this is true at last until SVR3V7 . bug has reported to Motorola. */
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125 set MAXREG,10 # max no of registers to save (d2-d7, a2-a5)
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126 mov.l (%sp)+,%a1 # pop return addr from top of stack
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127 mov.l (%sp)+,%d0 # pop size in bytes from top of stack
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128 mov.l %sp,%a0 # save stack pointer for register copy
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129 addq.l &3,%d0 # round size up to long word
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130 andi.l &-4,%d0 # mask out lower two bits of size
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131 mov.l %sp,%d1 # compute new value of sp to d1
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132 sub.l %d0,%d1 # pseudo-allocate by moving stack pointer
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133 sub.l &MAXREG*4,%d1 # allocate more space for saved regs.
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134 mov.l %d1,%sp # actual allocation.
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135 move.w &MAXREG-1,%d0 # d0 counts saved regs.
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136 mov.l %a2,%d1 # preserve a2.
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137 mov.l %sp,%a2 # make pointer to new reg save area.
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138 copy_regs_loop: # copy stuff from old save area.
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139 mov.l (%a0)+,(%a2)+ # save saved register
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140 dbra %d0,copy_regs_loop
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141 mov.l %a2,%a0 # now a2 is start of allocated space.
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142 mov.l %a2,%d0 # return it in both a0 and d0 to play safe.
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143 mov.l %d1,%a2 # restore a2.
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144 subq.l &4,%sp # new top of stack
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145 jmp (%a1) # far below normal return
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146 #else /* not MOTOROLA_DELTA */
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147 mov.l (%sp)+,%a1 # pop return addr from top of stack
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148 mov.l (%sp)+,%d0 # pop size in bytes from top of stack
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149 add.l &R%1,%d0 # round size up to long word
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150 and.l &-4,%d0 # mask out lower two bits of size
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151 sub.l %d0,%sp # allocate by moving stack pointer
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152 tst.b P%1(%sp) # stack probe to allocate pages
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153 mov.l %sp,%a0 # return pointer as pointer
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154 mov.l %sp,%d0 # return pointer as int to avoid disaster
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155 add.l &-4,%sp # new top of stack
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156 jmp (%a1) # not a normal return
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157 set S%1,64 # safety factor for C compiler scratch
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158 set R%1,3+S%1 # add to size for rounding
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159 set P%1,-132 # probe this far below current top of stack
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160 #endif /* not MOTOROLA_DELTA */
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161
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162 #else /* not m68k */
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163
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164 #ifdef m68000
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165
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166 #ifdef WICAT
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167 /*
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168 * Registers are saved after the corresponding link so we have to explicitly
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169 * move them to the top of the stack where they are expected to be.
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170 * Since we do not know how many registers were saved in the calling function
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171 * we must assume the maximum possible (d2-d7,a2-a5). Hence, we end up
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172 * wasting some space on the stack.
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173 *
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174 * The large probe (tst.b) attempts to make up for the fact that we have
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175 * potentially used up the space that the caller probed for its own needs.
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176 */
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177 .procss m0
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178 .config "68000 1"
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179 .module _alloca
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180 MAXREG: .const 10
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181 .sect text
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182 .global _alloca
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183 _alloca:
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184 move.l (sp)+,a1 ; pop return address
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185 move.l (sp)+,d0 ; pop allocation size
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186 move.l sp,d1 ; get current SP value
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187 sub.l d0,d1 ; adjust to reflect required size...
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188 sub.l #MAXREG*4,d1 ; ...and space needed for registers
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189 and.l #-4,d1 ; backup to longword boundary
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190 move.l sp,a0 ; save old SP value for register copy
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191 move.l d1,sp ; set the new SP value
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192 tst.b -4096(sp) ; grab an extra page (to cover caller)
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193 move.l a2,d1 ; save callers register
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194 move.l sp,a2
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195 move.w #MAXREG-1,d0 ; # of longwords to copy
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196 loop: move.l (a0)+,(a2)+ ; copy registers...
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197 dbra d0,loop ; ...til there are no more
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198 move.l a2,d0 ; end of register area is addr for new space
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199 move.l d1,a2 ; restore saved a2.
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200 addq.l #4,sp ; caller will increment sp by 4 after return.
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201 move.l d0,a0 ; return value in both a0 and d0.
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202 jmp (a1)
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203 .end _alloca
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204 #else
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205
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206 /* Some systems want the _, some do not. Win with both kinds. */
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207 .globl _alloca
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208 _alloca:
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209 .globl alloca
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210 alloca:
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211 movl sp@+,a0
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212 movl a7,d0
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213 subl sp@,d0
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214 andl #~3,d0
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215 movl d0,sp
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216 tstb sp@(0) /* Make stack pages exist */
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217 /* Needed on certain systems
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218 that lack true demand paging */
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219 addql #4,d0
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220 jmp a0@
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221
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222 #endif /* not WICAT */
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223 #endif /* m68000 */
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224 #endif /* not m68k */
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225 #endif /* not hp9000s300 */
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226
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227 #if defined (ns16000) || defined (ns32000)
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228
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229 .text
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230 .align 2
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231 /* Some systems want the _, some do not. Win with both kinds. */
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232 .globl _alloca
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233 _alloca:
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234 .globl alloca
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235 alloca:
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236
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237 /* Two different assembler syntaxes are used for the same code
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238 on different systems. */
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239
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240 #ifdef sequent
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241 #define IM
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242 #define REGISTER(x) x
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243 #else
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244 #ifdef NS5 /* ns SysV assembler */
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245 #define IM $
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246 #define REGISTER(x) x
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247 #else
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248 #define IM $
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249 #define REGISTER(x) 0(x)
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250 #endif
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251 #endif
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252
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253 /*
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254 * The ns16000 is a little more difficult, need to copy regs.
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255 * Also the code assumes direct linkage call sequence (no mod table crap).
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256 * We have to copy registers, and therefore waste 32 bytes.
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257 *
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258 * Stack layout:
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259 * new sp -> junk
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260 * registers (copy)
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261 * r0 -> new data
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262 * | (orig retval)
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263 * | (orig arg)
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264 * old sp -> regs (orig)
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265 * local data
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266 * fp -> old fp
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267 */
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268
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269 movd tos,r1 /* pop return addr */
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270 negd tos,r0 /* pop amount to allocate */
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271 sprd sp,r2
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272 addd r2,r0
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273 bicb IM/**/3,r0 /* 4-byte align */
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274 lprd sp,r0
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275 adjspb IM/**/36 /* space for regs, +4 for caller to pop */
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276 movmd 0(r2),4(sp),IM/**/4 /* copy regs */
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277 movmd 0x10(r2),0x14(sp),IM/**/4
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278 jump REGISTER(r1) /* funky return */
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279 #endif /* ns16000 or ns32000 */
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280
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281 #ifdef pyramid
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282
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283 .globl _alloca
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284
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285 _alloca: addw $3,pr0 # add 3 (dec) to first argument
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286 bicw $3,pr0 # then clear its last 2 bits
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287 subw pr0,sp # subtract from SP the val in PR0
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288 andw $-32,sp # keep sp aligned on multiple of 32.
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289 movw sp,pr0 # ret. current SP
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290 ret
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291
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292 #ifdef PYRAMID_OLD /* This isn't needed in system version 4. */
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293 .globl __longjmp
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294 .globl _longjmp
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295 .globl __setjmp
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296 .globl _setjmp
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297
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298 __longjmp: jump _longjmp
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299 __setjmp: jump _setjmp
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300 #endif
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301
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302 #endif /* pyramid */
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303
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304 #ifdef ATT3B5
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305
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306 .align 4
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307 .globl alloca
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308
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309 alloca:
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310 movw %ap, %r8
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311 subw2 $9*4, %r8
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312 movw 0(%r8), %r1 /* pc */
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313 movw 4(%r8), %fp
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314 movw 8(%r8), %sp
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315 addw2 %r0, %sp /* make room */
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316 movw %sp, %r0 /* return value */
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317 jmp (%r1) /* continue... */
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318
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319 #endif /* ATT3B5 */
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320
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321 #ifdef XENIX
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322
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323 .386
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324
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325 _TEXT segment dword use32 public 'CODE'
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326 assume cs:_TEXT
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327
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328 ;-------------------------------------------------------------------------
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329
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330 public _alloca
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331 _alloca proc near
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332
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333 pop ecx ; return address
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334 pop eax ; amount to alloc
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335 add eax,3 ; round it to 32-bit boundary
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336 and al,11111100B ;
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337 mov edx,esp ; current sp in edx
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338 sub edx,eax ; lower the stack
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339 xchg esp,edx ; start of allocation in esp, old sp in edx
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340 mov eax,esp ; return ptr to base in eax
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341 push [edx+8] ; save poss. stored reg. values (esi,edi,ebx)
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342 push [edx+4] ; on lowered stack
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343 push [edx] ;
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344 sub esp,4 ; allow for 'add esp, 4'
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345 jmp ecx ; jump to return address
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346
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347 _alloca endp
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348
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349 _TEXT ends
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350
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351 end
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352
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353 #endif /* XENIX */
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354
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355 #endif /* not HAVE_ALLOCA */