projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| c13aa77a KB |
1 | /* |
| 2 | * Copyright (c) 1982 Regents of the University of California | |
| 3 | * @(#)asscanl.h 4.5 6/30/83 | |
| 4 | */ | |
| 5 | /* | |
| 6 | * This file contains definitions local to the files implementing | |
| 7 | * the character scanner and the token buffer managers. | |
| 8 | * It is not intended to be shared with any other parts of the | |
| 9 | * assembler. | |
| 10 | * The file ``asscan.h'' is shared with other parts of the assembler | |
| 11 | */ | |
| 12 | #include <stdio.h> | |
| 13 | #include "as.h" | |
| 14 | #include "asscan.h" | |
| 15 | ||
| 16 | #define EOFCHAR (-1) | |
| 17 | /* | |
| 18 | * The table of possible uses for each character to test set inclusion. | |
| 19 | */ | |
| 20 | #define HEXFLAG 01 /* 'x' or 'X' */ | |
| 21 | #define HEXLDIGIT 02 /* 'a' .. 'f' */ | |
| 22 | #define HEXUDIGIT 04 /* 'A' .. 'F' */ | |
| 23 | #define ALPHA 010 /* 'A' .. 'Z', 'a' .. 'z', '_'*/ | |
| 24 | #define DIGIT 020 /* '0' .. '9' */ | |
| 25 | #define FLOATEXP 040 /* 'd' 'e' 'D' 'E' 'g' 'h' 'G' 'H' */ | |
| 26 | #define SIGN 0100 /* '+' .. '-'*/ | |
| 27 | #define REGDIGIT 0200 /* '0' .. '5' */ | |
| 28 | #define SZSPECBEGIN 0400 /* 'b', 'B', 'l', 'L', 'w', 'W' */ | |
| 29 | #define POINT 01000 /* '.' */ | |
| 30 | #define SPACE 02000 /* '\t' or ' ' */ | |
| 31 | #define BSESCAPE 04000 /* bnrtf */ | |
| 32 | #define STRESCAPE 010000 /* '"', '\\', '\n' */ | |
| 33 | #define OCTDIGIT 020000 /* '0' .. '7' */ | |
| 34 | #define FLOATFLAG 040000 /* 'd', 'D', 'f', 'F' */ | |
| 35 | ||
| 36 | #define INCHARSET(val, kind) (charsets[val] & (kind) ) | |
| 37 | /* | |
| 38 | * We use our own version of getchar/ungetc to get | |
| 39 | * some speed improvement | |
| 40 | */ | |
| 41 | extern char *Ginbufptr; | |
| 42 | extern int Ginbufcnt; | |
| 43 | #define REGTOMEMBUF Ginbufptr = inbufptr, Ginbufcnt = inbufcnt | |
| 44 | #define MEMTOREGBUF inbufptr = Ginbufptr, inbufcnt = Ginbufcnt | |
| 45 | #undef getchar | |
| 46 | #define getchar() \ | |
| 47 | (inbufcnt-- > 0 ? (*inbufptr++) : \ | |
| 48 | (fillinbuffer(), \ | |
| 49 | MEMTOREGBUF, \ | |
| 50 | inbufptr[-1])) | |
| 51 | #undef ungetc | |
| 52 | #define ungetc(ch) \ | |
| 53 | (++inbufcnt, *--inbufptr = ch) | |
| 54 | \f | |
| 55 | /* | |
| 56 | * Variables and definitions to manage the token buffering. | |
| 57 | * We scan (lexically analyze) a large number of tokens, and | |
| 58 | * then parse all of the tokens in the scan buffer. | |
| 59 | * This reduces procedure call overhead when the parser | |
| 60 | * demands a token, allows for an efficient reread during | |
| 61 | * the second pass, and confuses the line number reporting | |
| 62 | * for errors encountered in the scanner and in the parser. | |
| 63 | */ | |
| 64 | #define TOKDALLOP 8 | |
| 65 | struct tokbufdesc *bufstart; /*where the buffer list begins*/ | |
| 66 | struct tokbufdesc *buftail; /*last one on the list*/ | |
| 67 | struct tokbufdesc *emptybuf; /*the one being filled*/ | |
| 68 | /* | |
| 69 | * If we are using VM, during the second pass we reclaim the used | |
| 70 | * token buffers for saving the relocation information | |
| 71 | */ | |
| 72 | struct tokbufdesc *tok_free; /* free pool */ | |
| 73 | struct tokbufdesc *tok_temp; /* temporary for doing list manipulation */ | |
| 74 | /* | |
| 75 | * Other token buffer managers | |
| 76 | */ | |
| 77 | int bufno; /*which buffer number: 0,1 for tmp file*/ | |
| 78 | struct tokbufdesc tokbuf[2]; /*our initial increment of buffers*/ | |
| 79 | ptrall tokptr; /*where the current token comes from*/ | |
| 80 | ptrall tokub; /*the last token in the current token buffer*/ | |
| 81 | /* | |
| 82 | * as does not use fread and fwrite for the token buffering. | |
| 83 | * The token buffers are integrals of BUFSIZ | |
| 84 | * at all times, so we use direct read and write. | |
| 85 | * fread and fwrite in stdio are HORRENDOUSLY inefficient, | |
| 86 | * as they use putchar for each character, nested two deep in loops. | |
| 87 | */ | |
| 88 | #define writeTEST(pointer, size, nelements, ioptr) \ | |
| 89 | write(ioptr->_file, pointer, nelements * size) != nelements * size | |
| 90 | ||
| 91 | #define readTEST(pointer, size, nelements, ioptr) \ | |
| 92 | read(ioptr->_file, pointer, nelements * size) != nelements * size | |
| 93 | ||
| 94 | #define bskiplg(from, length) \ | |
| 95 | from = (char *)((int)(from + sizeof(lgtype)-1)&~(sizeof(lgtype)-1)); \ | |
| 96 | *(lgtype *)from = length; \ | |
| 97 | (bytetoktype *)from += sizeof(lgtype) + length | |
| 98 | ||
| 99 | #define bskipfromto(from, to) \ | |
| 100 | from = (char *)((int)(from + sizeof(lgtype)-1)&~(sizeof(lgtype)-1)); \ | |
| 101 | *(lgtype *)from = (bytetoktype *)to - (bytetoktype *)from - sizeof(lgtype); \ | |
| 102 | (bytetoktype *)from += sizeof (lgtype) + (bytetoktype *)to - (bytetoktype *)from | |
| 103 | ||
| 104 | #define eatskiplg(from) \ | |
| 105 | from = (char *)((int)(from + sizeof(lgtype)-1)&~(sizeof(lgtype)-1)); \ | |
| 106 | (bytetoktype *)from += sizeof(lgtype) + *(lgtype *)from | |
| 107 | ||
| 108 | #ifdef DEBUG | |
| 109 | ptrall firsttoken; | |
| 110 | #endif DEBUG | |
| 111 | ||
| 112 | /* | |
| 113 | * The following three variables are the slots for global | |
| 114 | * communication with the parser. | |
| 115 | * They are the semantic values associated with a particular token. | |
| 116 | * The token itself is the return value from yylex() | |
| 117 | */ | |
| 118 | int yylval; /* normal semantic value */ | |
| 119 | Bignum yybignum; /* a big number */ | |
| 120 | u_char yyopcode; /* a structure opcode */ | |
| 121 | ||
| 122 | int newfflag; | |
| 123 | char *newfname; | |
| 124 | int scanlineno; /*the scanner's linenumber*/ | |
| 125 | ||
| 126 | /* | |
| 127 | * Definitions for sets of characters | |
| 128 | */ | |
| 129 | readonly short charsets[]; | |
| 130 | readonly short type[]; |