egman.c
资源名称:pccts133.zip [点击查看]
上传用户:itx_2006
上传日期:2007-01-06
资源大小:493k
文件大小:9k
源码类别:
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开发平台:
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- /*
- * egman.c
- *
- * SOFTWARE RIGHTS
- *
- * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
- * Set (PCCTS) -- PCCTS is in the public domain. An individual or
- * company may do whatever they wish with source code distributed with
- * PCCTS or the code generated by PCCTS, including the incorporation of
- * PCCTS, or its output, into commerical software.
- *
- * We encourage users to develop software with PCCTS. However, we do ask
- * that credit is given to us for developing PCCTS. By "credit",
- * we mean that if you incorporate our source code into one of your
- * programs (commercial product, research project, or otherwise) that you
- * acknowledge this fact somewhere in the documentation, research report,
- * etc... If you like PCCTS and have developed a nice tool with the
- * output, please mention that you developed it using PCCTS. In
- * addition, we ask that this header remain intact in our source code.
- * As long as these guidelines are kept, we expect to continue enhancing
- * this system and expect to make other tools available as they are
- * completed.
- *
- * ANTLR 1.33MR10
- * 1998
- *
- */
- #include <stdio.h>
- #include "set.h"
- #include "syn.h"
- #include "hash.h"
- #include "generic.h"
- #include "proto.h"
- static ExceptionGroup **egArray=NULL; /* ExceptionGroup by BlkLevel */
- static LabelEntry **leArray=NULL; /* LabelEntry by BlkLevel */
- static Junction **altArray=NULL; /* start of alternates */
- static int arraySize=0;
- static int highWater=0;
- static ExceptionGroup *lastEG=NULL; /* used in altFixup() */
- static int lastBlkLevel=0; /* used in altFixup() */
- static void arrayCheck();
- /* Called to add an exception group for an alternative EG */
- #ifdef __USE_PROTOS
- void egAdd(ExceptionGroup * eg)
- #else
- void egAdd(eg)
- ExceptionGroup *eg;
- #endif
- {
- int i;
- ExceptionGroup *nextEG;
- ExceptionGroup *innerEG;
- LabelEntry *nextLE;
- LabelEntry *innerLE;
- Junction *nextAlt;
- Junction *innerAlt;
- lastEG=eg;
- lastBlkLevel=BlkLevel;
- arrayCheck();
- eg->pendingLink=egArray[BlkLevel];
- egArray[BlkLevel]=eg;
- /* EG for alternates already have their atlID filled in */
- for (i=BlkLevel+1; i<=highWater ; i++) {
- for (innerEG=egArray[i]; innerEG != NULL ; innerEG=nextEG) {
- nextEG=innerEG->pendingLink;
- innerEG->pendingLink=NULL;
- innerEG->outerEG=eg;
- };
- egArray[i]=NULL;
- };
- /*
- * for patching up the LabelEntry you might use an EG for the
- * current alternative - unlike patching up an alternative EG
- * i.e. start the loop at BlkLevel rather than (BlkLevel+1)
- * fill it in only if the EG and the LE are for the very
- * same alternative if they're at the same BlkLevel
- * it's easier to leave the LE on this list (filled in) rather than
- * trying to selectively remove it. It will eventually be
- * removed anyway when the BlkLevel gets small enough.
- */
- for (i=BlkLevel; i<=highWater ; i++) {
- for (innerLE=leArray[i]; innerLE != NULL ; innerLE=nextLE) {
- nextLE=innerLE->pendingLink;
- if (BlkLevel != i ||
- innerLE->curAltNum == CurAltNum) {
- if (innerLE->outerEG == NULL) {
- innerLE->outerEG=eg;
- };
- };
- };
- if (BlkLevel != i) leArray[i]=NULL;
- };
- /*
- * For the start of alternatives it is necessary to make a
- * distinction between the exception group for the current
- * alternative and the "fallback" EG for the block which
- * contains the alternative
- *
- * The fallback outerEG is used to handle the case where
- * no alternative of a block matches. In that case the
- * signal is "NoViableAlt" (or "NoSemViableAlt" and the
- * generator needs the EG of the block CONTAINING the
- * current one.
- *
- * rule: ( ( ( a
- * | b
- * )
- * | c
- * )
- * | d
- * );
- */
- for (i=BlkLevel; i <= highWater ; i++) {
- for (innerAlt=altArray[i]; innerAlt != NULL ; innerAlt=nextAlt) {
- nextAlt=innerAlt->pendingLink;
- /* first fill in the EG for the current alternative */
- /* but leave it on the list in order to get the fallback EG */
- /* if the EG is at the same LEVEL as the alternative then */
- /* fill it in only if in the very same alternative */
- /* */
- /* rule: ( a */
- /* | b */
- /* | c exception ... */
- /* ) */
- /* */
- /* if the EG is outside the alternative (e.g. BlkLevel < i) */
- /* then it doesn't matter about the alternative */
- /* */
- /* rule: ( a */
- /* | b */
- /* | c */
- /* ) exception ... */
- /* */
- #if 0
- printf("BlkLevel=%d i=%d altnum=%d CurAltNum=%d altID=%sn",
- BlkLevel,i,innerAlt->curAltNum,CurAltNum,eg->altID);
- #endif
- if (BlkLevel != i ||
- innerAlt->curAltNum == CurAltNum) {
- if (innerAlt->exception_label == NULL) {
- innerAlt->exception_label=eg->altID;
- };
- };
- /* ocurs at a later pass then for the exception_label */
- /* if an outerEG has been found then fill in the outer EG */
- /* remove if from the list when the BlkLevel gets smaller */
- if (BlkLevel != i) {
- if (innerAlt->outerEG == NULL) {
- innerAlt->outerEG=eg;
- };
- };
- };
- if (BlkLevel != i) altArray[i]=NULL;
- };
- }
- #ifdef __USE_PROTOS
- void leAdd(LabelEntry * le)
- #else
- void leAdd(le)
- LabelEntry *le;
- #endif
- {
- arrayCheck();
- le->pendingLink=leArray[BlkLevel];
- le->curAltNum=CurAltNum;
- leArray[BlkLevel]=le;
- }
- #ifdef __USE_PROTOS
- void altAdd(Junction *alt)
- #else
- void altAdd(alt)
- Junction *alt;
- #endif
- {
- arrayCheck();
- #if 0
- printf("BlkLevel=%d CurAltNum=%dn",
- BlkLevel,CurAltNum);
- #endif
- alt->curAltNum=CurAltNum;
- alt->pendingLink=altArray[BlkLevel];
- altArray[BlkLevel]=alt;
- }
- static void arrayCheck() {
- ExceptionGroup **egArrayNew;
- LabelEntry **leArrayNew;
- Junction **altArrayNew;
- int arraySizeNew;
- int i;
- if (BlkLevel > highWater) highWater=BlkLevel;
- if (BlkLevel >= arraySize) {
- arraySizeNew=arraySize+5;
- egArrayNew=(ExceptionGroup **)
- calloc(arraySizeNew,sizeof(ExceptionGroup *));
- leArrayNew=(LabelEntry **)
- calloc(arraySizeNew,sizeof(LabelEntry *));
- altArrayNew=(Junction **)
- calloc(arraySizeNew,sizeof(Junction *));
- for (i=0; i<arraySize ; i++) {
- egArrayNew[i]=egArray[i];
- leArrayNew[i]=leArray[i];
- altArrayNew[i]=altArray[i];
- };
- arraySize=arraySizeNew;
- if (egArray != NULL) free( (char *) egArray);
- if (leArray != NULL) free( (char *) leArray);
- if (altArray != NULL) free( (char *) altArray);
- egArray=egArrayNew;
- leArray=leArrayNew;
- altArray=altArrayNew;
- };
- }
- /* always call leFixup() BEFORE egFixup() */
- void egFixup() {
- int i;
- ExceptionGroup *nextEG;
- ExceptionGroup *innerEG;
- for (i=1; i<=highWater ; i++) {
- for (innerEG=egArray[i]; innerEG != NULL ; innerEG=nextEG) {
- nextEG=innerEG->pendingLink;
- innerEG->pendingLink=NULL;
- };
- egArray[i]=NULL;
- };
- lastEG=NULL;
- lastBlkLevel=0;
- }
- /* always call leFixup() BEFORE egFixup() */
- void leFixup() {
- int i;
- LabelEntry *nextLE;
- LabelEntry *innerLE;
- for (i=BlkLevel; i<=highWater ; i++) {
- for (innerLE=leArray[i]; innerLE != NULL ; innerLE=nextLE) {
- nextLE=innerLE->pendingLink;
- innerLE->pendingLink=NULL;
- };
- leArray[i]=NULL;
- };
- }
- /* always call altFixup() BEFORE egFixup() */
- void altFixup() {
- int i;
- Junction *nextAlt;
- Junction *innerAlt;
- for (i=BlkLevel; i<=highWater ; i++) {
- for (innerAlt=altArray[i]; innerAlt != NULL ; innerAlt=nextAlt) {
- /* if an outerEG has been found then fill in the outer EG */
- if (lastBlkLevel <= i) {
- if (innerAlt->outerEG == NULL) {
- innerAlt->outerEG=lastEG;
- };
- };
- nextAlt=innerAlt->pendingLink;
- innerAlt->pendingLink=NULL;
- };
- altArray[i]=NULL;
- };
- }