kc3-lang/angle/src/compiler/preprocessor/cpp.c

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• Hash : 3b5643cf
  Author :
  Date : 2011-02-28T15:06:55
  

  Avoid division by zero in the preprocessor
  Trac #15792
  Issue=115
  
  Signed-off-by: Daniel Koch
  Author: Nicolas Capens
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@566 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/compiler/preprocessor/cpp.c

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  //
  // cpp.c
  //
  
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <ctype.h>
  
  #include "compiler/preprocessor/slglobals.h"
  
  static int CPPif(yystypepp * yylvalpp);
  
  /* Don't use memory.c's replacements, as we clean up properly here */
  #undef malloc
  #undef free
  
  static int bindAtom = 0;
  static int constAtom = 0;
  static int defaultAtom = 0;
  static int defineAtom = 0;
  static int definedAtom = 0;
  static int elseAtom = 0;
  static int elifAtom = 0;
  static int endifAtom = 0;
  static int ifAtom = 0;
  static int ifdefAtom = 0;
  static int ifndefAtom = 0;
  static int includeAtom = 0;
  static int lineAtom = 0;
  static int pragmaAtom = 0;
  static int texunitAtom = 0;
  static int undefAtom = 0;
  static int errorAtom = 0;
  static int __LINE__Atom = 0;
  static int __FILE__Atom = 0;
  static int __VERSION__Atom = 0;
  static int versionAtom = 0;
  static int extensionAtom = 0;
  
  static Scope *macros = 0;
  #define MAX_MACRO_ARGS  64
  
  static SourceLoc ifloc; /* outermost #if */
  
  int InitCPP(void)
  {
      char        buffer[64], *t;
      const char  *f;
  
      // Add various atoms needed by the CPP line scanner:
      bindAtom = LookUpAddString(atable, "bind");
      constAtom = LookUpAddString(atable, "const");
      defaultAtom = LookUpAddString(atable, "default");
      defineAtom = LookUpAddString(atable, "define");
      definedAtom = LookUpAddString(atable, "defined");
      elifAtom = LookUpAddString(atable, "elif");
      elseAtom = LookUpAddString(atable, "else");
      endifAtom = LookUpAddString(atable, "endif");
      ifAtom = LookUpAddString(atable, "if");
      ifdefAtom = LookUpAddString(atable, "ifdef");
      ifndefAtom = LookUpAddString(atable, "ifndef");
      includeAtom = LookUpAddString(atable, "include");
      lineAtom = LookUpAddString(atable, "line");
      pragmaAtom = LookUpAddString(atable, "pragma");
      texunitAtom = LookUpAddString(atable, "texunit");
      undefAtom = LookUpAddString(atable, "undef");
  	errorAtom = LookUpAddString(atable, "error");
      __LINE__Atom = LookUpAddString(atable, "__LINE__");
      __FILE__Atom = LookUpAddString(atable, "__FILE__");
  	__VERSION__Atom = LookUpAddString(atable, "__VERSION__");
      versionAtom = LookUpAddString(atable, "version");
      extensionAtom = LookUpAddString(atable, "extension");
      macros = NewScopeInPool(mem_CreatePool(0, 0));
      strcpy(buffer, "PROFILE_");
      t = buffer + strlen(buffer);
      f = cpp->options.profileString;
      while ((isalnum(*f) || *f == '_') && t < buffer + sizeof(buffer) - 1)
          *t++ = toupper(*f++);
      *t = 0;
  
      PredefineIntMacro("GL_ES", 1);
      PredefineIntMacro("GL_FRAGMENT_PRECISION_HIGH", 1);
  
  	return 1;
  } // InitCPP
  
  int FreeCPP(void)
  {
      if (macros)
      {
          mem_FreePool(macros->pool);
          macros = 0;
      }
  
      return 1;
  }
  
  int FinalCPP(void)
  {
  	if (cpp->ifdepth)
  		CPPErrorToInfoLog("#if mismatch");
      return 1;
  }
  
  static int CPPdefine(yystypepp * yylvalpp)
  {
      int token, name, args[MAX_MACRO_ARGS], argc;
      const char *message;
      MacroSymbol mac;
      Symbol *symb;
      SourceLoc dummyLoc;
      memset(&mac, 0, sizeof(mac));
      token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      if (token != CPP_IDENTIFIER) {
          CPPErrorToInfoLog("#define");
          return token;
      }
      name = yylvalpp->sc_ident;
      token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      if (token == '(' && !yylvalpp->sc_int) {
          // gather arguments
          argc = 0;
          do {
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              if (argc == 0 && token == ')') break;
              if (token != CPP_IDENTIFIER) {
  				CPPErrorToInfoLog("#define");
                  return token;
              }
              if (argc < MAX_MACRO_ARGS)
                  args[argc++] = yylvalpp->sc_ident;
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
          } while (token == ',');
          if (token != ')') {
              CPPErrorToInfoLog("#define");
              return token;
          }
          mac.argc = argc;
          mac.args = mem_Alloc(macros->pool, argc * sizeof(int));
          memcpy(mac.args, args, argc * sizeof(int));
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	}
      mac.body = NewTokenStream(GetAtomString(atable, name), macros->pool);
      while (token != '\n') {
          if (token == '\\') {
              CPPErrorToInfoLog("The line continuation character (\\) is not part of the OpenGL ES Shading Language");
              return token;
          } else if (token <= 0) { // EOF or error
              CPPErrorToInfoLog("unexpected end of input in #define preprocessor directive - expected a newline");
              return 0;
          }
          RecordToken(mac.body, token, yylvalpp);
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      };
  
      symb = LookUpSymbol(macros, name);
      if (symb) {
          if (!symb->details.mac.undef) {
              // already defined -- need to make sure they are identical
              if (symb->details.mac.argc != mac.argc) goto error;
              for (argc=0; argc < mac.argc; argc++)
                  if (symb->details.mac.args[argc] != mac.args[argc])
                      goto error;
              RewindTokenStream(symb->details.mac.body);
              RewindTokenStream(mac.body);
              do {
                  int old_lval, old_token;
                  old_token = ReadToken(symb->details.mac.body, yylvalpp);
                  old_lval = yylvalpp->sc_int;
                  token = ReadToken(mac.body, yylvalpp);
                  if (token != old_token || yylvalpp->sc_int != old_lval) { 
                  error:
                      StoreStr("Macro Redefined");
                      StoreStr(GetStringOfAtom(atable,name));
                      message=GetStrfromTStr();
                      DecLineNumber();
                      CPPShInfoLogMsg(message);
                      IncLineNumber();
                      ResetTString();
                      break; }
              } while (token > 0);
          }
          //FreeMacro(&symb->details.mac);
      } else {
          dummyLoc.file = 0;
          dummyLoc.line = 0;
          symb = AddSymbol(&dummyLoc, macros, name, MACRO_S);
      }
      symb->details.mac = mac;
      return '\n';
  } // CPPdefine
  
  static int CPPundef(yystypepp * yylvalpp)
  {
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      Symbol *symb;
  	if(token == '\n'){
  		CPPErrorToInfoLog("#undef");
  	    return token;
      }
      if (token != CPP_IDENTIFIER)
            goto error;
      symb = LookUpSymbol(macros, yylvalpp->sc_ident);
      if (symb) {
          symb->details.mac.undef = 1;
      }
      token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      if (token != '\n') {
      error:
          CPPErrorToInfoLog("#undef");
      }
      return token;
  } // CPPundef
  
  /* CPPelse -- skip forward to appropriate spot.  This is actually used
  ** to skip to and #endif after seeing an #else, AND to skip to a #else,
  ** #elif, or #endif after a #if/#ifdef/#ifndef/#elif test was false
  */
  
  static int CPPelse(int matchelse, yystypepp * yylvalpp)
  {
      int atom,depth=0;
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	
  	while (token > 0) {
          if (token != '#') {
              while (token != '\n') {
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                  if (token <= 0) { // EOF or error
                      CPPErrorToInfoLog("unexpected end of input in #else preprocessor directive - expected a newline");
                      return 0;
                  }
              }
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              continue;
          }
  		if ((token = cpp->currentInput->scan(cpp->currentInput, yylvalpp)) != CPP_IDENTIFIER)
  			continue;
          atom = yylvalpp->sc_ident;
          if (atom == ifAtom || atom == ifdefAtom || atom == ifndefAtom){
              depth++; cpp->ifdepth++; cpp->elsetracker++;
              if (cpp->ifdepth > MAX_IF_NESTING) {
                  CPPErrorToInfoLog("max #if nesting depth exceeded");
                  cpp->CompileError = 1;
                  return 0;
              }
              // sanity check elsetracker
              if (cpp->elsetracker < 0 || cpp->elsetracker >= MAX_IF_NESTING) {
                  CPPErrorToInfoLog("mismatched #if/#endif statements");
                  cpp->CompileError = 1;
                  return 0;
              }
              cpp->elsedepth[cpp->elsetracker] = 0;
          }
          else if (atom == endifAtom) {
              if(--depth<0){
                  if (cpp->elsetracker)
                      --cpp->elsetracker;
                  if (cpp->ifdepth) 
                      --cpp->ifdepth;
                  break;
              }             
              --cpp->elsetracker;
              --cpp->ifdepth;
          }
          else if (((int)(matchelse) != 0)&& depth==0) {
  			if (atom == elseAtom ) {
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                  if (token != '\n') {
                      CPPWarningToInfoLog("unexpected tokens following #else preprocessor directive - expected a newline");
                      while (token != '\n') {
                          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                          if (token <= 0) { // EOF or error
                              CPPErrorToInfoLog("unexpected end of input following #else preprocessor directive - expected a newline");
                              return 0;
                          }
                      }
                  } 
  				break;
  			} 
  			else if (atom == elifAtom) {
                  /* we decrement cpp->ifdepth here, because CPPif will increment
                   * it and we really want to leave it alone */
  				if (cpp->ifdepth){
  					--cpp->ifdepth;
  				    --cpp->elsetracker;
  				}
                  return CPPif(yylvalpp);
              }
  		}
          else if((atom==elseAtom) && (!ChkCorrectElseNesting())){
              CPPErrorToInfoLog("#else after a #else");
              cpp->CompileError=1;
              return 0;
          }
  	};
      return token;
  }
  
  enum eval_prec {
      MIN_PREC,
      COND, LOGOR, LOGAND, OR, XOR, AND, EQUAL, RELATION, SHIFT, ADD, MUL, UNARY,
      MAX_PREC
  };
  
  static int op_logor(int a, int b) { return a || b; }
  static int op_logand(int a, int b) { return a && b; }
  static int op_or(int a, int b) { return a | b; }
  static int op_xor(int a, int b) { return a ^ b; }
  static int op_and(int a, int b) { return a & b; }
  static int op_eq(int a, int b) { return a == b; }
  static int op_ne(int a, int b) { return a != b; }
  static int op_ge(int a, int b) { return a >= b; }
  static int op_le(int a, int b) { return a <= b; }
  static int op_gt(int a, int b) { return a > b; }
  static int op_lt(int a, int b) { return a < b; }
  static int op_shl(int a, int b) { return a << b; }
  static int op_shr(int a, int b) { return a >> b; }
  static int op_add(int a, int b) { return a + b; }
  static int op_sub(int a, int b) { return a - b; }
  static int op_mul(int a, int b) { return a * b; }
  static int op_div(int a, int b) { return a / b; }
  static int op_mod(int a, int b) { return a % b; }
  static int op_pos(int a) { return a; }
  static int op_neg(int a) { return -a; }
  static int op_cmpl(int a) { return ~a; }
  static int op_not(int a) { return !a; }
  
  struct {
      int token, prec, (*op)(int, int);
  } binop[] = {
      { CPP_OR_OP, LOGOR, op_logor },
      { CPP_AND_OP, LOGAND, op_logand },
      { '|', OR, op_or },
      { '^', XOR, op_xor },
      { '&', AND, op_and },
      { CPP_EQ_OP, EQUAL, op_eq },
      { CPP_NE_OP, EQUAL, op_ne },
      { '>', RELATION, op_gt },
      { CPP_GE_OP, RELATION, op_ge },
      { '<', RELATION, op_lt },
      { CPP_LE_OP, RELATION, op_le },
      { CPP_LEFT_OP, SHIFT, op_shl },
      { CPP_RIGHT_OP, SHIFT, op_shr },
      { '+', ADD, op_add },
      { '-', ADD, op_sub },
      { '*', MUL, op_mul },
      { '/', MUL, op_div },
      { '%', MUL, op_mod },
  };
  
  struct {
      int token, (*op)(int);
  } unop[] = {
      { '+', op_pos },
      { '-', op_neg },
      { '~', op_cmpl },
      { '!', op_not },
  };
  
  #define ALEN(A) (sizeof(A)/sizeof(A[0]))
  
  static int eval(int token, int prec, int *res, int *err, yystypepp * yylvalpp)
  {
      int         i, val;
      Symbol      *s;
      if (token == CPP_IDENTIFIER) {
          if (yylvalpp->sc_ident == definedAtom) {
              int needclose = 0;
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              if (token == '(') {
                  needclose = 1;
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              }
              if (token != CPP_IDENTIFIER)
                  goto error;
              *res = (s = LookUpSymbol(macros, yylvalpp->sc_ident))
                          ? !s->details.mac.undef : 0;
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              if (needclose) {
                  if (token != ')')
                      goto error;
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              }
  		} else if (MacroExpand(yylvalpp->sc_ident, yylvalpp)) {
  			token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              return eval(token, prec, res, err, yylvalpp);
          } else {
              goto error;
          }
  	} else if (token == CPP_INTCONSTANT) {
          *res = yylvalpp->sc_int;
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      } else if (token == '(') {
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
          token = eval(token, MIN_PREC, res, err, yylvalpp);
          if (!*err) {
              if (token != ')')
                  goto error;
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
          }
      } else {
          for (i = ALEN(unop) - 1; i >= 0; i--) {
              if (unop[i].token == token)
                  break;
          }
          if (i >= 0) {
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              token = eval(token, UNARY, res, err, yylvalpp);
              *res = unop[i].op(*res);
          } else {
              goto error;
          }
      }
      while (!*err) {
          if (token == ')' || token == '\n') break;
          for (i = ALEN(binop) - 1; i >= 0; i--) {
              if (binop[i].token == token)
                  break;
          }
          if (i < 0 || binop[i].prec <= prec)
              break;
          val = *res;
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
          token = eval(token, binop[i].prec, res, err, yylvalpp);
          
          if (binop[i].op == op_div || binop[i].op == op_mod)
          {
              if (*res == 0)
              {
                  CPPErrorToInfoLog("preprocessor divide or modulo by zero");
                  *err = 1;
                  return token;
              }
          }
  
          *res = binop[i].op(val, *res);
      }
      return token;
  error:
      CPPErrorToInfoLog("incorrect preprocessor directive");
      *err = 1;
      *res = 0;
      return token;
  } // eval
  
  static int CPPif(yystypepp * yylvalpp) {
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      int res = 0, err = 0;
  
      if (!cpp->ifdepth++)
          ifloc = *cpp->tokenLoc;
      if(cpp->ifdepth > MAX_IF_NESTING){
          CPPErrorToInfoLog("max #if nesting depth exceeded");
          cpp->CompileError = 1;
          return 0;
      }
      cpp->elsetracker++;
      // sanity check elsetracker
      if (cpp->elsetracker < 0 || cpp->elsetracker >= MAX_IF_NESTING) {
          CPPErrorToInfoLog("mismatched #if/#endif statements");
          cpp->CompileError = 1;
          return 0;
      }
      cpp->elsedepth[cpp->elsetracker] = 0;
  
      token = eval(token, MIN_PREC, &res, &err, yylvalpp);
      if (token != '\n') {
          CPPWarningToInfoLog("unexpected tokens following #if preprocessor directive - expected a newline");
          while (token != '\n') {
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
              if (token <= 0) { // EOF or error
                  CPPErrorToInfoLog("unexpected end of input in #if preprocessor directive - expected a newline");
                  return 0;
              }
          }
      } 
      if (!res && !err) {
          token = CPPelse(1, yylvalpp);
      }
  
      return token;
  } // CPPif
  
  static int CPPifdef(int defined, yystypepp * yylvalpp)
  {
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      int name = yylvalpp->sc_ident;
      if(++cpp->ifdepth > MAX_IF_NESTING){
          CPPErrorToInfoLog("max #if nesting depth exceeded");
          cpp->CompileError = 1;
          return 0;
      }
      cpp->elsetracker++;
      // sanity check elsetracker
      if (cpp->elsetracker < 0 || cpp->elsetracker >= MAX_IF_NESTING) {
          CPPErrorToInfoLog("mismatched #if/#endif statements");
          cpp->CompileError = 1;
          return 0;
      }
      cpp->elsedepth[cpp->elsetracker] = 0;
  
      if (token != CPP_IDENTIFIER) {
              defined ? CPPErrorToInfoLog("ifdef"):CPPErrorToInfoLog("ifndef");
      } else {
          Symbol *s = LookUpSymbol(macros, name);
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
          if (token != '\n') {
              CPPWarningToInfoLog("unexpected tokens following #ifdef preprocessor directive - expected a newline");
              while (token != '\n') {
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                  if (token <= 0) { // EOF or error
                      CPPErrorToInfoLog("unexpected end of input in #ifdef preprocessor directive - expected a newline");
                      return 0;
                  }
              }
          }
          if (((s && !s->details.mac.undef) ? 1 : 0) != defined)
              token = CPPelse(1, yylvalpp);
      }
      return token;
  } // CPPifdef
  
  static int CPPline(yystypepp * yylvalpp) 
  {
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	if(token=='\n'){
  		DecLineNumber();
          CPPErrorToInfoLog("#line");
          IncLineNumber();
  		return token;
  	}
  	else if (token == CPP_INTCONSTANT) {
  		yylvalpp->sc_int=atoi(yylvalpp->symbol_name);
  		SetLineNumber(yylvalpp->sc_int);
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
          
  		if (token == CPP_INTCONSTANT) {
              yylvalpp->sc_int=atoi(yylvalpp->symbol_name);
  			SetStringNumber(yylvalpp->sc_int);
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  			if(token!='\n')
  				CPPErrorToInfoLog("#line");
          }
  		else if (token == '\n'){
  			return token;
  		}
  		else{
              CPPErrorToInfoLog("#line");
  		}
  	}
  	else{
            CPPErrorToInfoLog("#line");
  	}
      return token;
  }
  
  static int CPPerror(yystypepp * yylvalpp) {
  
  	int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      const char *message;
  	
      while (token != '\n') {
          if (token <= 0){
              CPPErrorToInfoLog("unexpected end of input in #error preprocessor directive - expected a newline");
              return 0;
          }else if (token == CPP_FLOATCONSTANT || token == CPP_INTCONSTANT){
              StoreStr(yylvalpp->symbol_name);
  		}else if(token == CPP_IDENTIFIER || token == CPP_STRCONSTANT){
  			StoreStr(GetStringOfAtom(atable,yylvalpp->sc_ident));
  		}else {
  		    StoreStr(GetStringOfAtom(atable,token));
  		}
  		token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	}
  	DecLineNumber();
  	//store this msg into the shader's information log..set the Compile Error flag!!!!
  	message=GetStrfromTStr();
      CPPShInfoLogMsg(message);
      ResetTString();
      cpp->CompileError=1;
      IncLineNumber();
      return '\n';
  }//CPPerror
  
  static int CPPpragma(yystypepp * yylvalpp)
  {
  	char SrcStrName[2];
  	char** allTokens;
  	int tokenCount = 0;
  	int maxTokenCount = 10;
  	const char* SrcStr;
  	int i;
  
  	int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	
  	if (token=='\n') {
  		DecLineNumber();
          CPPErrorToInfoLog("#pragma");
          IncLineNumber();
  	    return token;
  	}
  	
  	allTokens = (char**)malloc(sizeof(char*) * maxTokenCount);	
  
  	while (token != '\n') {
  		if (tokenCount >= maxTokenCount) {
  			maxTokenCount *= 2;
  			allTokens = (char**)realloc((char**)allTokens, sizeof(char*) * maxTokenCount);
  		}
  		switch (token) {
  		case CPP_IDENTIFIER:
  			SrcStr = GetAtomString(atable, yylvalpp->sc_ident);
  			allTokens[tokenCount] = (char*)malloc(strlen(SrcStr) + 1);
  			strcpy(allTokens[tokenCount++], SrcStr);
  			break;
  		case CPP_INTCONSTANT:
  			SrcStr = yylvalpp->symbol_name;
  			allTokens[tokenCount] = (char*)malloc(strlen(SrcStr) + 1);
  			strcpy(allTokens[tokenCount++], SrcStr);
  			break;
  		case CPP_FLOATCONSTANT:
  			SrcStr = yylvalpp->symbol_name;
  			allTokens[tokenCount] = (char*)malloc(strlen(SrcStr) + 1);
  			strcpy(allTokens[tokenCount++], SrcStr);
  			break;
  		case -1:
              // EOF
              CPPShInfoLogMsg("#pragma directive must end with a newline");			
  			return token;
  		default:
  			SrcStrName[0] = token;
  			SrcStrName[1] = '\0';
  			allTokens[tokenCount] = (char*)malloc(2);
  			strcpy(allTokens[tokenCount++], SrcStrName);
  		}
  		token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	}
  
  	cpp->currentInput->ungetch(cpp->currentInput, token, yylvalpp);
  	HandlePragma((const char**)allTokens, tokenCount);
  	token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	
  	for (i = 0; i < tokenCount; ++i) {
  		free (allTokens[i]);
  	}
  	free (allTokens);	
  
  	return token;    
  } // CPPpragma
  
  #define ESSL_VERSION_NUMBER 100
  #define ESSL_VERSION_STRING "100"
  
  static int CPPversion(yystypepp * yylvalpp)
  {
  
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  
      if (cpp->pastFirstStatement == 1)
          CPPShInfoLogMsg("#version must occur before any other statement in the program");
  
      if(token=='\n'){
  		DecLineNumber();
          CPPErrorToInfoLog("#version");
          IncLineNumber();
  		return token;
  	}
      if (token != CPP_INTCONSTANT)
          CPPErrorToInfoLog("#version");
  	
      yylvalpp->sc_int=atoi(yylvalpp->symbol_name);
  	//SetVersionNumber(yylvalpp->sc_int);
      
      if (yylvalpp->sc_int != ESSL_VERSION_NUMBER)
          CPPShInfoLogMsg("Version number not supported by ESSL");
  
      token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      
  	if (token == '\n'){
  		return token;
  	}
  	else{
          CPPErrorToInfoLog("#version");
  	}
      return token;
  } // CPPversion
  
  static int CPPextension(yystypepp * yylvalpp)
  {
  
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      char extensionName[MAX_SYMBOL_NAME_LEN + 1];
  
      if(token=='\n'){
  		DecLineNumber();
          CPPShInfoLogMsg("extension name not specified");
          IncLineNumber();
  		return token;
  	}
  
      if (token != CPP_IDENTIFIER)
          CPPErrorToInfoLog("#extension");
      
      strncpy(extensionName, GetAtomString(atable, yylvalpp->sc_ident), MAX_SYMBOL_NAME_LEN);
      extensionName[MAX_SYMBOL_NAME_LEN] = '\0';
  	    
      token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      if (token != ':') {
          CPPShInfoLogMsg("':' missing after extension name");
          return token;
      }
      
      token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      if (token != CPP_IDENTIFIER) {
          CPPShInfoLogMsg("behavior for extension not specified");
          return token;
      }
  
      updateExtensionBehavior(extensionName, GetAtomString(atable, yylvalpp->sc_ident));
  
      token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	if (token == '\n'){
  		return token;
  	}
  	else{
          CPPErrorToInfoLog("#extension");
  	}
      return token;
  } // CPPextension
  
  int readCPPline(yystypepp * yylvalpp)
  {
      int token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
      const char *message;
      int isVersion = 0;
  
      if (token == CPP_IDENTIFIER) {
          if (yylvalpp->sc_ident == defineAtom) {
               token = CPPdefine(yylvalpp);
          } else if (yylvalpp->sc_ident == elseAtom) {
  			 if(ChkCorrectElseNesting()){
                   if (!cpp->ifdepth ){
                       CPPErrorToInfoLog("#else mismatch");
                       cpp->CompileError=1;
                       return 0;
                   }
                   token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                   if (token != '\n') {
                       CPPWarningToInfoLog("unexpected tokens following #else preprocessor directive - expected a newline");
                       while (token != '\n') {
                           token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                           if (token <= 0) { // EOF or error
                               CPPErrorToInfoLog("unexpected end of input in #ifdef preprocessor directive - expected a newline");
                               return 0;
                           }
                       }
                   }
  			     token = CPPelse(0, yylvalpp);
               }else{
                   CPPErrorToInfoLog("#else after a #else");
                   cpp->ifdepth = 0;
                   cpp->elsetracker = 0;
                   cpp->pastFirstStatement = 1;
                   cpp->CompileError = 1;
                   return 0;
               }
  		} else if (yylvalpp->sc_ident == elifAtom) {
              if (!cpp->ifdepth){
                   CPPErrorToInfoLog("#elif mismatch");
                   cpp->CompileError=1;
                   return 0;
              } 
              // this token is really a dont care, but we still need to eat the tokens
              token = cpp->currentInput->scan(cpp->currentInput, yylvalpp); 
              while (token != '\n') {
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                  if (token <= 0) { // EOF or error
                      CPPErrorToInfoLog("unexpect tokens following #elif preprocessor directive - expected a newline");
                      cpp->CompileError = 1;
                      return 0;
                  }
              }
  		    token = CPPelse(0, yylvalpp);
          } else if (yylvalpp->sc_ident == endifAtom) {
               if (!cpp->ifdepth){
                   CPPErrorToInfoLog("#endif mismatch");
                   cpp->CompileError=1;
                   return 0;
               }
               else
                   --cpp->ifdepth;
  
               if (cpp->elsetracker)
                   --cpp->elsetracker;
  
  	    } else if (yylvalpp->sc_ident == ifAtom) {
               token = CPPif(yylvalpp);
          } else if (yylvalpp->sc_ident == ifdefAtom) {
               token = CPPifdef(1, yylvalpp);
          } else if (yylvalpp->sc_ident == ifndefAtom) {
               token = CPPifdef(0, yylvalpp);
          } else if (yylvalpp->sc_ident == lineAtom) {
               token = CPPline(yylvalpp);
          } else if (yylvalpp->sc_ident == pragmaAtom) {
               token = CPPpragma(yylvalpp);
          } else if (yylvalpp->sc_ident == undefAtom) {
               token = CPPundef(yylvalpp);
          } else if (yylvalpp->sc_ident == errorAtom) {
               token = CPPerror(yylvalpp);
          } else if (yylvalpp->sc_ident == versionAtom) {
              token = CPPversion(yylvalpp);
              isVersion = 1;
          } else if (yylvalpp->sc_ident == extensionAtom) {
              token = CPPextension(yylvalpp);
          } else {
              StoreStr("Invalid Directive");
              StoreStr(GetStringOfAtom(atable,yylvalpp->sc_ident));
              message=GetStrfromTStr();
              CPPShInfoLogMsg(message);
              ResetTString();
          }
      }
      while (token != '\n' && token != 0 && token != EOF) {
  		token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  	}
          
      cpp->pastFirstStatement = 1;
  
      return token;
  } // readCPPline
  
  void FreeMacro(MacroSymbol *s) {
      DeleteTokenStream(s->body);
  }
  
  void PredefineIntMacro(const char *name, int value) {
      SourceLoc location = {0};
      Symbol *symbol = NULL;
      MacroSymbol macro = {0};
      yystypepp val = {0};
      int atom = 0;
  
      macro.body = NewTokenStream(name, macros->pool);
      val.sc_int = value;
      sprintf(val.symbol_name, "%d", value);
      RecordToken(macro.body, CPP_INTCONSTANT, &val);
      atom = LookUpAddString(atable, name);
      symbol = AddSymbol(&location, macros, atom, MACRO_S);
      symbol->details.mac = macro;
  }
  
  static int eof_scan(InputSrc *in, yystypepp * yylvalpp) { return -1; }
  static void noop(InputSrc *in, int ch, yystypepp * yylvalpp) { }
  
  static void PushEofSrc() {
      InputSrc *in = malloc(sizeof(InputSrc));
      memset(in, 0, sizeof(InputSrc));
      in->scan = eof_scan;
      in->getch = eof_scan;
      in->ungetch = noop;
      in->prev = cpp->currentInput;
      cpp->currentInput = in;
  }
  
  static void PopEofSrc() {
      if (cpp->currentInput->scan == eof_scan) {
          InputSrc *in = cpp->currentInput;
          cpp->currentInput = in->prev;
          free(in);
      }
  }
  
  static TokenStream *PrescanMacroArg(TokenStream *a, yystypepp * yylvalpp) {
      int token;
      TokenStream *n;
      RewindTokenStream(a);
      do {
          token = ReadToken(a, yylvalpp);
          if (token == CPP_IDENTIFIER && LookUpSymbol(macros, yylvalpp->sc_ident))
              break;
      } while (token > 0);
      if (token <= 0) return a;
      n = NewTokenStream("macro arg", 0);
      PushEofSrc();
      ReadFromTokenStream(a, 0, 0);
      while ((token = cpp->currentInput->scan(cpp->currentInput, yylvalpp)) > 0) {
          if (token == CPP_IDENTIFIER && MacroExpand(yylvalpp->sc_ident, yylvalpp))
              continue;
          RecordToken(n, token, yylvalpp);
      }
      PopEofSrc();
      DeleteTokenStream(a);
      return n;
  } // PrescanMacroArg
  
  typedef struct MacroInputSrc {
      InputSrc    base;
      MacroSymbol *mac;
      TokenStream **args;
  } MacroInputSrc;
  
  /* macro_scan ---
  ** return the next token for a macro expanion, handling macro args 
  */
  static int macro_scan(MacroInputSrc *in, yystypepp * yylvalpp) {
      int i;
      int token = ReadToken(in->mac->body, yylvalpp);
      if (token == CPP_IDENTIFIER) {
          for (i = in->mac->argc-1; i>=0; i--)
              if (in->mac->args[i] == yylvalpp->sc_ident) break;
          if (i >= 0) {
              ReadFromTokenStream(in->args[i], yylvalpp->sc_ident, 0);
              return cpp->currentInput->scan(cpp->currentInput, yylvalpp);
          }
      }
      if (token > 0) return token;
      in->mac->busy = 0;
      cpp->currentInput = in->base.prev;
      if (in->args) {
          for (i=in->mac->argc-1; i>=0; i--)
              DeleteTokenStream(in->args[i]);
          free(in->args);
      }
      free(in);
      return cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  } // macro_scan
  
  /* MacroExpand
  ** check an identifier (atom) to see if it a macro that should be expanded.
  ** If it is, push an InputSrc that will produce the appropriate expansion
  ** and return TRUE.  If not, return FALSE.
  */
  
  int MacroExpand(int atom, yystypepp * yylvalpp)
  {
      Symbol              *sym = LookUpSymbol(macros, atom);
      MacroInputSrc       *in;
      int i,j, token, depth=0;
      const char *message;
  	if (atom == __LINE__Atom) {
          yylvalpp->sc_int = GetLineNumber();
          sprintf(yylvalpp->symbol_name,"%d",yylvalpp->sc_int);
          UngetToken(CPP_INTCONSTANT, yylvalpp);
          return 1;
      }
      if (atom == __FILE__Atom) {
          yylvalpp->sc_int = GetStringNumber();
          sprintf(yylvalpp->symbol_name,"%d",yylvalpp->sc_int);
          UngetToken(CPP_INTCONSTANT, yylvalpp);
          return 1;
      }
  	if (atom == __VERSION__Atom) {
          strcpy(yylvalpp->symbol_name,ESSL_VERSION_STRING);
          yylvalpp->sc_int = atoi(yylvalpp->symbol_name);
          UngetToken(CPP_INTCONSTANT, yylvalpp);
          return 1;
      }
      if (!sym || sym->details.mac.undef) return 0;
      if (sym->details.mac.busy) return 0;        // no recursive expansions
      in = malloc(sizeof(*in));
      memset(in, 0, sizeof(*in));
      in->base.scan = (void *)macro_scan;
      in->base.line = cpp->currentInput->line;
      in->base.name = cpp->currentInput->name;
      in->mac = &sym->details.mac;
      if (sym->details.mac.args) {
          token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
  		if (token != '(') {
              UngetToken(token, yylvalpp);
              yylvalpp->sc_ident = atom;
              return 0;
          }
          in->args = malloc(in->mac->argc * sizeof(TokenStream *));
          for (i=0; i<in->mac->argc; i++)
              in->args[i] = NewTokenStream("macro arg", 0);
  		i=0;j=0;
          do{
              depth = 0;
  			while(1) {
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                  if (token <= 0) {
                      StoreStr("EOF in Macro ");
                      StoreStr(GetStringOfAtom(atable,atom));
                      message=GetStrfromTStr();
                      CPPShInfoLogMsg(message);
                      ResetTString();
                      return 1;
                  }
                  if((in->mac->argc==0) && (token!=')')) break;
                  if (depth == 0 && (token == ',' || token == ')')) break;
                  if (token == '(') depth++;
                  if (token == ')') depth--;
                  RecordToken(in->args[i], token, yylvalpp);
                  j=1;
  			}
              if (token == ')') {
                  if((in->mac->argc==1) &&j==0)
                      break;
                  i++;
                  break;
              }
              i++;
  		}while(i < in->mac->argc);
  
          if (i < in->mac->argc) {
              StoreStr("Too few args in Macro ");
              StoreStr(GetStringOfAtom(atable,atom));
              message=GetStrfromTStr();
              CPPShInfoLogMsg(message);
              ResetTString();
          } else if (token != ')') {
              depth=0;
  			while (token >= 0 && (depth > 0 || token != ')')) {
                  if (token == ')') depth--;
                  token = cpp->currentInput->scan(cpp->currentInput, yylvalpp);
                  if (token == '(') depth++;
              }
  			
              if (token <= 0) {
                  StoreStr("EOF in Macro ");
                  StoreStr(GetStringOfAtom(atable,atom));
                  message=GetStrfromTStr();
                  CPPShInfoLogMsg(message);
                  ResetTString();
                  return 1;
              }
              StoreStr("Too many args in Macro ");
              StoreStr(GetStringOfAtom(atable,atom));
              message=GetStrfromTStr();
              CPPShInfoLogMsg(message);
              ResetTString();
  		}
  		for (i=0; i<in->mac->argc; i++) {
              in->args[i] = PrescanMacroArg(in->args[i], yylvalpp);
          }
      }
  #if 0
      printf("  <%s:%d>found macro %s\n", GetAtomString(atable, loc.file),
             loc.line, GetAtomString(atable, atom));
      for (i=0; i<in->mac->argc; i++) {
          printf("\targ %s = '", GetAtomString(atable, in->mac->args[i]));
          DumpTokenStream(stdout, in->args[i]);
          printf("'\n");
      }
  #endif
  	/*retain the input source*/
      in->base.prev = cpp->currentInput;
      sym->details.mac.busy = 1;
      RewindTokenStream(sym->details.mac.body);
      cpp->currentInput = &in->base;
      return 1;
  } // MacroExpand
  
  int ChkCorrectElseNesting(void)
  {
      // sanity check to make sure elsetracker is in a valid range
      if (cpp->elsetracker < 0 || cpp->elsetracker >= MAX_IF_NESTING) {
          return 0;
      }
  
      if (cpp->elsedepth[cpp->elsetracker] == 0) {
          cpp->elsedepth[cpp->elsetracker] = 1;
          return 1;
      }
      return 0;
  }
  
  
  

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