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https://github.com/Interlisp/maiko.git
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Maiko sources matching state as of 020102 prior to initial patching for Mac OSX
This commit is contained in:
Nick Briggs
334
src/hardrtn.c
Executable file
334
src/hardrtn.c
Executable file
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/* $Id: hardrtn.c,v 1.4 2001/12/24 01:09:02 sybalsky Exp $ (C) Copyright Venue, All Rights Reserved */
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static char *id = "$Id: hardrtn.c,v 1.4 2001/12/24 01:09:02 sybalsky Exp $ Copyright (C) Venue";
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/************************************************************************/
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/* */
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/* (C) Copyright 1989-95 Venue. All Rights Reserved. */
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/* Manufactured in the United States of America. */
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/* */
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/* The contents of this file are proprietary information */
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/* belonging to Venue, and are provided to you under license. */
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/* They may not be further distributed or disclosed to third */
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/* parties without the specific permission of Venue. */
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/* */
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/************************************************************************/
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#include "version.h"
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/********************************************************************/
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/*
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File Name : hardrtn.c
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Edited by Takeshi Shimizu
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Date: 10-MAY-88
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RET VAL: If success: 0
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else (NO SPACE in STACK) 1 -> should cause HARDRESET
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*/
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/********************************************************************/
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#include "lispemul.h"
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#include "lispmap.h"
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#include "lsptypes.h"
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#include "adr68k.h"
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#include "address.h"
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#include "lspglob.h"
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#include "emlglob.h"
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#include "cell.h"
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#include "stack.h"
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#include "return.h"
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#define MAKE_FXCOPY(fx68k) { BEFORE_CONTEXTSW; \
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if((fx68k=(FX*)make_FXcopy(fx68k)) == 0){ \
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return(1); /* Whole space exhausted */} \
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AFTER_CONTEXTSW; \
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CHECK_FX(fx68k);}
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void incusecount68k(FX *fx68k),decusecount68k(register FX *frame68k);
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/********************************************************************/
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/*
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Func Name : slowreturn()
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Edited by Takeshi Shimizu
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DATE: 10-MAY-88
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RET VAL : If 0 success
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If 1 NO STACK SPACE->uraid-> HARDRESET
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*/
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/********************************************************************/
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slowreturn(void)
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{
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register DLword *next68k;
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register DLword *freeptr;
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register Bframe *currentBF;
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register FX *returnFX;
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extern FX *make_FXcopy(register FX *fx68k);
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S_CHECK(SLOWP(CURRENTFX), "CURRENTFX not SLOWP");
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/* Get returnee's FX from CURRENTFX->alink , It's SLOWP case */
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returnFX= (FX*)Addr68k_from_StkOffset(CURRENTFX->alink-11);
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if((CURRENTFX->alink & 0xFFFE) != CURRENTFX->clink)
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{ /* ALINK != CLINK */
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#ifdef STACKCHECK
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printf("A!=C\n");
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#endif
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/* return to CLINK fx */
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SETALINK(CURRENTFX,CURRENTFX->clink);
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decusecount68k(returnFX);
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returnFX = (FX*)Addr68k_from_StkOffset(CURRENTFX->clink - FRAMESIZE);
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}
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if(returnFX->usecount !=0)
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{ /* COPY returnee's FX */
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#ifdef STACKCHECK
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printf("returnFX->usecount !=0\n");
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#endif
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MAKE_FXCOPY(returnFX);/* smashes returnFX */
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}
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retry : /* this is retry entry after MAKE_FXCOPY etc */
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next68k = Addr68k_from_StkOffset(returnFX->nextblock) ;
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currentBF = (Bframe *)Addr68k_from_StkOffset(CURRENTFX->blink);
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if(GETWORD(next68k) == STK_FSB_WORD)
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{
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another:freeptr = ((DLword *)CURRENTFX)-2 ;
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if( BFRAMEPTR(freeptr)->residual)
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{
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if(BFRAMEPTR(currentBF)->usecnt == 0)
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{
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/* make FREEBLOCK for real BF */
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GETWORD(IVar) = STK_FSB_WORD;
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GETWORD(IVar +1) =(((UNSIGNED)currentBF - (UNSIGNED)IVar)>>1 )+2 ;
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if (0 == GETWORD(IVar+1)) error("creating 0-len block");
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}
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else
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BFRAMEPTR(currentBF)->usecnt --;
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}
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else
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freeptr = IVar ; /* reset free ptr: not residual case */
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/* free FX + BF(dummy or real) */
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GETWORD(freeptr) = STK_FSB_WORD;
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GETWORD(freeptr +1)= ((UNSIGNED)EndSTKP - (UNSIGNED)freeptr)>>1 ;
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if (0 == GETWORD(freeptr+1)) error("creating 0-len block");
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S_CHECK(EndSTKP >= freeptr, "EndSTKP < freeptr!");
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S_CHECK(FSB_size(freeptr) >= MINEXTRASTACKWORDS,
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"free block < min size, after deciding it fits.");
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PVar=((DLword *)returnFX) + FRAMESIZE ;
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/* Now right CURRENTFX(PVar) is set */
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if (GETWORD(next68k) != STK_FSB_WORD)
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error("OP_return: MP9316");
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freeptr = next68k ;
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while(GETWORD(freeptr)==STK_FSB_WORD)
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EndSTKP = freeptr = freeptr + GETWORD(freeptr+1);
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if(CURRENTFX->incall)
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{ /* this frame is Interrupted */
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error("Stack error: INCALL bit found in returnee frame");
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}
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else
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{
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if (CURRENTFX->nopush)
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{
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CURRENTFX->nopush =NIL;
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CurrentStackPTR = next68k-2 ;
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TopOfStack = *((LispPTR *)CurrentStackPTR) ;
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CurrentStackPTR-=2;
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}
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else
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CurrentStackPTR = next68k-2 ;
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S_CHECK(EndSTKP >= freeptr, "EndSTKP < freeptr");
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FastRetCALL;
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#ifdef LISPTRACE
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printf("TRACE: return from ");
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print(fnobj->framename);
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printf(" :<= ");
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print(TopOfStack);printf("\n");
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#endif
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return(0); /* normal return */
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}
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}/* FSB end */
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else if (next68k != IVar)
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{
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#ifdef STACKCHECK
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printf("next68k != IVar and not FSB\n");
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#endif
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MAKE_FXCOPY(returnFX);/* smashes returnFX */
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goto retry;
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}
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else if (BFRAMEPTR(currentBF)->usecnt != 0)
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{
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#ifdef STACKCHECK
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printf("currentBF->usecnt != 0");
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#endif
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MAKE_FXCOPY(returnFX);/* smashes returnFX */
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goto retry;
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}
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else {
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if((next68k == IVar)|| (BFRAMEPTR(currentBF)->usecnt ==0))
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goto another;
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else error("Shouldn't");
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}
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} /* slowreturn end */
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FX *make_FXcopy(register FX *fx68k)
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{
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register int size;
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int nametbl_on_stk=NIL;
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register DLword *new68k;
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register Bframe *retbf68k;
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extern DLword *freestackblock(DLword n, StackWord *start68k, int align);
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#ifdef FLIPCURSOR
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flip_cursorbar(5);
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#endif
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CHECK_FX(fx68k);
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size = FX_size(fx68k) + DLWORDSPER_CELL;
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#ifdef BIGVM
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if(fx68k->validnametable && ((fx68k->nametable >> 16)==STK_HI))
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#else
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if(fx68k->validnametable && (fx68k->hi2nametable==STK_HI))
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#endif /* BIGVM */
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{
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/* frame contains a name table, so we care that the alignment
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of the new block be same as old */
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#ifdef STACKCHECK
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{ DLword n;
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#ifdef BIGVM
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n = fx68k->nametable & 0xFFFF;
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#else
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n=fx68k->lonametable;
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#endif /* BIGVM */
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if((n <= StkOffset_from_68K(fx68k))
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&& (n >= fx68k->nextblock))
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error("hardreturn:nametable check");
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}
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#endif
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nametbl_on_stk = T;
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/* Find a free stack block */
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new68k=freestackblock(size,(StackWord *)CURRENTFX,
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(StkOffset_from_68K(fx68k)-DLWORDSPER_CELL)% DLWORDSPER_QUAD);
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} /*if end */
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else new68k=freestackblock(size,(StackWord *)CURRENTFX,-1); /* No align */
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if(new68k == 0) return(0); /* No more space for STACK */
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/* blt(dest,source,size) */
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blt(new68k,(((DLword*)fx68k) - DLWORDSPER_CELL),size);
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((Bframe*)new68k)->residual =T;
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new68k = new68k + DLWORDSPER_CELL; /* now NEW points to the FX */
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((FX*)new68k)->nextblock=(StkOffset_from_68K(new68k) + size)-DLWORDSPER_CELL;
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retbf68k=(Bframe*)Addr68k_from_StkOffset(GETBLINK(fx68k));
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/* Set true BFptr,not the residual */
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SETBLINK(new68k,GETBLINK(fx68k));
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((FX*)new68k)->usecount=0;
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CHECK_BF(retbf68k);
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#ifdef BIGVM
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if(nametbl_on_stk)
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((FX*)new68k)->nametable += (((UNSIGNED)new68k - (UNSIGNED)fx68k)>>1);
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#else
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if(nametbl_on_stk)
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((FX*)new68k)->lonametable += (((UNSIGNED)new68k - (UNSIGNED)fx68k)>>1);
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#endif
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/* increment use count of basic frame of returnee because
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we made another FX which points to it */
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retbf68k->usecnt ++;
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SET_FASTP_NIL(fx68k);
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/* increment use count of CLINK of returnee
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because we made a copy of returnee */
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incusecount68k((FX *)Addr68k_from_StkOffset(GETCLINK(fx68k)));
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if(GETCLINK(fx68k) != GETALINK(fx68k))
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{
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incusecount68k((FX *)Addr68k_from_StkOffset(GETALINK(fx68k)));
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}
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decusecount68k(fx68k);/* if usecon==0 -> FSB */
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SETACLINK(CURRENTFX,StkOffset_from_68K(new68k));
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CHECK_FX(new68k);
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CHECK_FX(CURRENTFX);
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#ifdef STACKCHECK
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stack_check(0);
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#endif
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#ifdef FLIPCURSOR
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flip_cursorbar(5);
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#endif
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return((FX*)new68k);
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} /* make_FXcopy end */
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#define MAXSAFEUSECOUNT 200
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void incusecount68k(FX *fx68k)
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{
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StackWord *scanptr68k;
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if(FX_INVALIDP(fx68k)) return;
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CHECK_FX(fx68k);
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if((++(fx68k->usecount)) > MAXSAFEUSECOUNT)
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error("MP9324:Stack frame use count maximum exceeded");
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scanptr68k=(StackWord*)Addr68k_from_StkOffset(fx68k->nextblock);
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switch(STKWORD(scanptr68k)->flags)
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{
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case STK_NOTFLG:
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while(STKWORD(scanptr68k)->flags !=STK_BF)
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scanptr68k = (StackWord *)
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(((DLword *)scanptr68k)
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+ DLWORDSPER_CELL);
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break;
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case STK_BF: break;
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default : return;
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/* break; */
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} /* switch end */
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/* DEBUG */
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S_CHECK((((Bframe*)scanptr68k)->residual==T) ||
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( ((Bframe*)scanptr68k)->ivar== fx68k->nextblock) ,
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"BF not residual, and IVER /= nextblock of prior frame");
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scanptr68k = (StackWord *) (((DLword *)scanptr68k) + DLWORDSPER_CELL);
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if(STKWORD(scanptr68k)->flags == STK_FX)
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{
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CHECK_FX(scanptr68k);
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SET_FASTP_NIL(scanptr68k);
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}
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} /* incusecount68k end */
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