| |
| /****** global.h ********************************************************/ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <ctype.h> |
| /* |
| extern char *strcpy(); |
| extern int strcmp(); |
| */ |
| |
| #define STRMAX 999 /* size of lexemes array */ |
| #define SYMMAX 100 /* size of symtable */ |
| |
| #define BSIZE 128 /* buffer size */ |
| #define NONE -1 |
| #define EOS '\0' /* END OF STRING */ |
| |
| #define NUM 256 /* token for integers */ |
| #define ID 259 /* token for identifiers */ |
| #define DONE 260 /* token for end of file */ |
| |
| #define RNUM 2001 /* token for real numbers */ |
| #define INT 2002 /* token for the string "int" */ |
| #define FLOAT 2003 /* token for the string "float" */ |
| #define POP 2004 /* token for poping to a labeled location */ |
| #define PUSH_LABEL 2005 /* token for outputing push from labeled loc. */ |
| #define ARRAY 2006 /* token for an array referance */ |
| #define WHILE 2007 /* token for the keyword while */ |
| #define IF 2008 /* token for the keyword if */ |
| #define READ 2009 /* token for the keyword read */ |
| #define WRITE 2010 /* token for the keyword write */ |
| #define WRITELN 2011 /* token for the keyword writeln */ |
| #define EQUAL 2012 /* token for == */ |
| #define NEQUAL 2013 /* token for != */ |
| #define LABEL_CODE 2014 /* emitter code to label an assemble stmt */ |
| #define PUSH_CODE_LABEL 2015 /* emitter code to push code labels */ |
| #define COMP 2016 /* emitter code for comp opcode */ |
| #define BEQ 2017 /* emitter code for BEQ */ |
| #define B 2018 /* emitter code for B */ |
| #define STORE 2020 /* emitter code to output ST */ |
| #define STH 2022 /* emitter code for STH command */ |
| #define VAL 2023 /* emitter code for VAL command */ |
| #define ELSE 2024 /* token for keyword else */ |
| #define BNE 2025 /* emitter code for BNE command */ |
| #define BEGIN 2026 /* emitter code: print special char at start prg*/ |
| #define END 2027 /* emitter code: print special char at end prog */ |
| #define IST 2028 /* emitter code for IST instruction */ |
| #define ADD 2029 /* emitter code for ADD */ |
| #define RADD 2030 /* emitter code for RADD */ |
| #define SUB 2031 /* emitter code for SUB */ |
| #define RSUB 2032 /* emitter code for RSUB */ |
| #define MUL 2033 /* emitter code for MUL */ |
| #define RMUL 2034 /* emitter code for RMUL */ |
| #define DIV 2035 /* emitter code for DIV */ |
| #define RDIV 2036 /* emitter code for RDIV */ |
| #define SWAP 2037 /* emitter code for SWAP */ |
| #define NEG 2038 /* emitter code for NEG */ |
| #define RNEG 2039 /* emitter code for RNEG */ |
| #define FIX 2040 /* emitter code for FIX */ |
| #define PARAM 2041 /* code for parameters in symbol tables */ |
| #define RETURN 2042 /* token for return keyword */ |
| #define READF 2043 /* token for readf() */ |
| #define READI 2044 /* token for readi() */ |
| #define WRITEF 2045 /* token for writef() */ |
| #define WRITEI 2046 /* token for writei() */ |
| #define LOC_DECL 2047 /* emitter code for a local declaration */ |
| #define GLO_DECL 2048 /* emitter code for a global declaration */ |
| #define PUSH_LOC_VAR_ADDR 2049 /* emitter code to push the address of a |
| local variable */ |
| #define PUSH_GLO_VAR_ADDR 2050 /* emitter code to push the address of a |
| global varialbe */ |
| #define PUSH_LOC_VAR_VALUE 2051 /* emitter code to push value stored |
| in a local variable */ |
| #define PUSH_GLO_VAR_VALUE 2052 /* emitter code to push value stored |
| in a global variable */ |
| #define STHB 2053 /* emitter code for STHB */ |
| #define LABEL_FUNC 2054 /* emitter code to insert function name in code */ |
| #define ISTB 2055 /* emitter code for ISTB instruction */ |
| #define STORE_RA 2056 /* emitter code to store return address */ |
| #define SAVE_FRAMESIZE 2057 /* emitter code to save frame size */ |
| #define PUSH_RA 2058 /* emitter code to push the return address */ |
| #define PUSH_FRAMESIZE 2059 /* emitter code for pushing the frame size */ |
| #define IB 2060 /* emitter code for ib */ |
| #define DB 2061 /* emitter code for db */ |
| #define NOTDEC 2062 /* emitter code for funtion not parsed */ |
| #define VALB 2063 /* emitter code for VALB */ |
| |
| int lookahead; /* token code number */ |
| int tokenval; /* value of token attribute */ |
| float ftokenval; /* global for float RNUM attribute */ |
| int FloatFlag; /* used as boolean, 1 if we doing float calcs. */ |
| int ErrorFlag; /* 1 if an error has occured, 0 otherwise */ |
| int DecCount; /* keeps track of memeory locations */ |
| int offset; /* offset within an activation record, local var*/ |
| int lineno; /* the current line number */ |
| int LabelCounter; /* used to create new labels for the mach. code */ |
| int NumberC; /* keeps track of number of commands emitted */ |
| char lexbuf[BSIZE]; /* stores lexeme to be inserted into symtable */ |
| int LocalIndex; /* value returned from lookup in loctable */ |
| int GlobalIndex; /* value returned from lookup to glotable */ |
| int NextLookahead; /* the next token of the input */ |
| int NextTokenval; /* the tokenval associated with the next token */ |
| float NextFtokenval; /* the ftokenval associated with the next token */ |
| int PreviousLookahead; /* the token that was last matched */ |
| int PreviousTokenval; /* tokenval associated with the previous token*/ |
| float PreviousFtokenval; /* ftokenval associated with the previous token*/ |
| int Scope; /* the label assoc. with the current function |
| to be used in the creation of unique labels */ |
| int ReturnLabel; /* stores the label to jump out of a function |
| if a return is encountered */ |
| int CallReturnAddr; /* return address of a function call */ |
| int FuncNameIndex; /* stores the index of the current function |
| name*/ |
| int ArrayParsed; /* flag set to 1 if PushArrayCellAddr() called |
| while lookahead is ARRAY */ |
| |
| struct entry { /* form of symbol table entry */ |
| char *lexptr; /* ptr to lexeme */ |
| int token; /* token: ID or ARRAY */ |
| int type; /* type of entry: INT or FLOAT */ |
| int size; /* size of entry: 1 for INT or FLOAT, |
| larger for arrays */ |
| int function; /* non-zero if is a function. |
| field is > 0 if function called but not parsed, |
| field is < 0 if function body has been parsed*/ |
| int functionlabel; /* stores the machine code label associated |
| with the function */ |
| }; |
| |
| |
| struct entry GlobalTable[SYMMAX]; /* Global symbol table */ |
| struct entry LocalTable[SYMMAX]; /* Local symbol table */ |
| |
