ref: 7ad634febd199d4004de98e81854fcbc6001de1a
dir: /src/asm/lexer.c/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include "asm/asm.h"
#include "asm/lexer.h"
#include "asm/types.h"
#include "asm/main.h"
#include "asm/rpn.h"
#include "asm/fstack.h"
#include "extern/err.h"
#include "asmy.h"
struct sLexString {
char *tzName;
ULONG nToken;
ULONG nNameLength;
struct sLexString *pNext;
};
#define pLexBufferRealStart (pCurrentBuffer->pBufferRealStart)
#define pLexBuffer (pCurrentBuffer->pBuffer)
#define AtLineStart (pCurrentBuffer->oAtLineStart)
#define SAFETYMARGIN 1024
extern size_t symvaluetostring(char *dest, size_t maxLength, char *sym);
struct sLexFloat tLexFloat[32];
struct sLexString *tLexHash[LEXHASHSIZE];
YY_BUFFER_STATE pCurrentBuffer;
ULONG nLexMaxLength; // max length of all keywords and operators
ULONG tFloatingSecondChar[256];
ULONG tFloatingFirstChar[256];
ULONG tFloatingChars[256];
ULONG nFloating;
enum eLexerState lexerstate = LEX_STATE_NORMAL;
#ifdef __GNUC__
void
strupr(char *s)
{
while (*s) {
*s = toupper(*s);
s += 1;
}
}
void
strlwr(char *s)
{
while (*s) {
*s = tolower(*s);
s += 1;
}
}
#endif
void
yyskipbytes(ULONG count)
{
pLexBuffer += count;
}
void
yyunputbytes(ULONG count)
{
pLexBuffer -= count;
}
void
yyunput(char c)
{
if (pLexBuffer <= pLexBufferRealStart)
fatalerror("Buffer safety margin exceeded");
*(--pLexBuffer) = c;
}
void
yyunputstr(char *s)
{
int i, len;
len = strlen(s);
if (pLexBuffer - len < pLexBufferRealStart)
fatalerror("Buffer safety margin exceeded");
for (i = len - 1; i >= 0; i--)
*(--pLexBuffer) = s[i];
}
void
yy_switch_to_buffer(YY_BUFFER_STATE buf)
{
pCurrentBuffer = buf;
}
void
yy_set_state(enum eLexerState i)
{
lexerstate = i;
}
void
yy_delete_buffer(YY_BUFFER_STATE buf)
{
free(buf->pBufferStart - SAFETYMARGIN);
free(buf);
}
YY_BUFFER_STATE
yy_scan_bytes(char *mem, ULONG size)
{
YY_BUFFER_STATE pBuffer;
if ((pBuffer = malloc(sizeof(struct yy_buffer_state))) != NULL) {
if ((pBuffer->pBufferRealStart =
malloc(size + 1 + SAFETYMARGIN)) != NULL) {
pBuffer->pBufferStart = pBuffer->pBufferRealStart + SAFETYMARGIN;
pBuffer->pBuffer = pBuffer->pBufferRealStart + SAFETYMARGIN;
memcpy(pBuffer->pBuffer, mem, size);
pBuffer->nBufferSize = size;
pBuffer->oAtLineStart = 1;
pBuffer->pBuffer[size] = 0;
return (pBuffer);
}
}
fatalerror("Out of memory!");
return (NULL);
}
YY_BUFFER_STATE
yy_create_buffer(FILE * f)
{
YY_BUFFER_STATE pBuffer;
if ((pBuffer = malloc(sizeof(struct yy_buffer_state))) != NULL) {
ULONG size;
fseek(f, 0, SEEK_END);
size = ftell(f);
fseek(f, 0, SEEK_SET);
if ((pBuffer->pBufferRealStart =
malloc(size + 2 + SAFETYMARGIN)) != NULL) {
char *mem;
ULONG instring = 0;
pBuffer->pBufferStart = pBuffer->pBufferRealStart + SAFETYMARGIN;
pBuffer->pBuffer = pBuffer->pBufferRealStart + SAFETYMARGIN;
size = fread(pBuffer->pBuffer, sizeof(UBYTE), size, f);
pBuffer->pBuffer[size] = '\n';
pBuffer->pBuffer[size + 1] = 0;
pBuffer->nBufferSize = size + 1;
mem = pBuffer->pBuffer;
while (*mem) {
if (*mem == '\"')
instring = 1 - instring;
if (mem[0] == '\\' &&
(mem[1] == '\"' || mem[1] == '\\')) {
mem += 2;
} else if (instring) {
mem += 1;
} else {
if ((mem[0] == 10 && mem[1] == 13)
|| (mem[0] == 13 && mem[1] == 10)) {
mem[0] = ' ';
mem[1] = '\n';
mem += 2;
} else if (mem[0] == 10 || mem[0] == 13) {
mem[0] = '\n';
mem += 1;
} else if (mem[0] == '\n' && mem[1] == '*') {
mem += 1;
while (!(*mem == '\n' || *mem == '\0'))
*mem++ = ' ';
} else if (*mem == ';') {
while (!(*mem == '\n' || *mem == '\0'))
*mem++ = ' ';
} else
mem += 1;
}
}
pBuffer->oAtLineStart = 1;
return (pBuffer);
}
}
fatalerror("Out of memory!");
return (NULL);
}
ULONG
lex_FloatAlloc(struct sLexFloat *token)
{
tLexFloat[nFloating] = *token;
return (1 << (nFloating++));
}
/*
* Make sure that only non-zero ASCII characters are used. Also, check if the
* start is greater than the end of the range.
*/
void
lex_CheckCharacterRange(UWORD start, UWORD end)
{
if (start > end || start < 1 || end > 127) {
errx(1, "Invalid character range (start: %u, end: %u)",
start, end);
}
}
void
lex_FloatDeleteRange(ULONG id, UWORD start, UWORD end)
{
lex_CheckCharacterRange(start, end);
while (start <= end) {
tFloatingChars[start] &= ~id;
start += 1;
}
}
void
lex_FloatAddRange(ULONG id, UWORD start, UWORD end)
{
lex_CheckCharacterRange(start, end);
while (start <= end) {
tFloatingChars[start] |= id;
start += 1;
}
}
void
lex_FloatDeleteFirstRange(ULONG id, UWORD start, UWORD end)
{
lex_CheckCharacterRange(start, end);
while (start <= end) {
tFloatingFirstChar[start] &= ~id;
start += 1;
}
}
void
lex_FloatAddFirstRange(ULONG id, UWORD start, UWORD end)
{
lex_CheckCharacterRange(start, end);
while (start <= end) {
tFloatingFirstChar[start] |= id;
start += 1;
}
}
void
lex_FloatDeleteSecondRange(ULONG id, UWORD start, UWORD end)
{
lex_CheckCharacterRange(start, end);
while (start <= end) {
tFloatingSecondChar[start] &= ~id;
start += 1;
}
}
void
lex_FloatAddSecondRange(ULONG id, UWORD start, UWORD end)
{
lex_CheckCharacterRange(start, end);
while (start <= end) {
tFloatingSecondChar[start] |= id;
start += 1;
}
}
struct sLexFloat *
lexgetfloat(ULONG nFloatMask)
{
if (nFloatMask == 0) {
fatalerror("Internal error in lexgetfloat");
}
int i = 0;
while ((nFloatMask & 1) == 0) {
nFloatMask >>= 1;
i++;
}
return (&tLexFloat[i]);
}
ULONG
lexcalchash(char *s)
{
ULONG hash = 0;
while (*s) {
hash = (hash * 283) ^ toupper(*s++);
}
return (hash % LEXHASHSIZE);
}
void
lex_Init(void)
{
ULONG i;
for (i = 0; i < LEXHASHSIZE; i++) {
tLexHash[i] = NULL;
}
for (i = 0; i < 256; i++) {
tFloatingFirstChar[i] = 0;
tFloatingSecondChar[i] = 0;
tFloatingChars[i] = 0;
}
nLexMaxLength = 0;
nFloating = 0;
}
void
lex_AddStrings(struct sLexInitString * lex)
{
while (lex->tzName) {
struct sLexString **ppHash;
ULONG hash;
ppHash = &tLexHash[hash = lexcalchash(lex->tzName)];
while (*ppHash)
ppHash = &((*ppHash)->pNext);
if (((*ppHash) = malloc(sizeof(struct sLexString))) != NULL) {
if (((*ppHash)->tzName =
(char *) strdup(lex->tzName)) != NULL) {
(*ppHash)->nNameLength = strlen(lex->tzName);
(*ppHash)->nToken = lex->nToken;
(*ppHash)->pNext = NULL;
strupr((*ppHash)->tzName);
if ((*ppHash)->nNameLength > nLexMaxLength)
nLexMaxLength = (*ppHash)->nNameLength;
} else
fatalerror("Out of memory!");
} else
fatalerror("Out of memory!");
lex += 1;
}
}
/*
* Gets the "float" mask and "float" length.
* "Float" refers to the token type of a token that is not a keyword.
* The character classes floatingFirstChar, floatingSecondChar, and
* floatingChars are defined separately for each token type.
* It uses bit masks to match against a set of simple regular expressions
* of the form /[floatingFirstChar]([floatingSecondChar][floatingChars]*)?/.
* The token types with the longest match from the current position in the
* buffer will have their bits set in the float mask.
*/
void
yylex_GetFloatMaskAndFloatLen(ULONG *pnFloatMask, ULONG *pnFloatLen)
{
// Note that '\0' should always have a bit mask of 0 in the "floating"
// tables, so it doesn't need to be checked for separately.
char *s = pLexBuffer;
ULONG nOldFloatMask = 0;
ULONG nFloatMask = tFloatingFirstChar[(int)*s];
if (nFloatMask != 0) {
s++;
nOldFloatMask = nFloatMask;
nFloatMask &= tFloatingSecondChar[(int)*s];
while (nFloatMask != 0) {
s++;
nOldFloatMask = nFloatMask;
nFloatMask &= tFloatingChars[(int)*s];
}
}
*pnFloatMask = nOldFloatMask;
*pnFloatLen = (ULONG)(s - pLexBuffer);
}
/*
* Gets the longest keyword/operator from the current position in the buffer.
*/
struct sLexString *
yylex_GetLongestFixed()
{
struct sLexString *pLongestFixed = NULL;
char *s = pLexBuffer;
ULONG hash = 0;
ULONG length = 0;
while (length < nLexMaxLength && *s) {
hash = (hash * 283) ^ toupper(*s);
s++;
length++;
struct sLexString *lex = tLexHash[hash % LEXHASHSIZE];
while (lex) {
if (lex->nNameLength == length
&& strncasecmp(pLexBuffer, lex->tzName, length) == 0) {
pLongestFixed = lex;
break;
}
lex = lex->pNext;
}
}
return pLongestFixed;
}
size_t
CopyMacroArg(char *dest, size_t maxLength, char c)
{
int i;
char *s;
int argNum;
switch (c) {
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
argNum = c - '0';
break;
case '@':
argNum = -1;
break;
default:
return 0;
}
if ((s = sym_FindMacroArg(argNum)) == NULL)
fatalerror("Macro argument not defined");
for (i = 0; s[i] != 0; i++) {
if (i >= maxLength) {
fatalerror("Macro argument too long to fit buffer");
}
dest[i] = s[i];
}
return i;
}
static inline void
yylex_StringWriteChar(char *s, size_t index, char c)
{
if (index >= MAXSTRLEN) {
fatalerror("String too long");
}
s[index] = c;
}
static inline void
yylex_SymbolWriteChar(char *s, size_t index, char c)
{
if (index >= MAXSYMLEN) {
fatalerror("Symbol too long");
}
s[index] = c;
}
/*
* Trims white space at the end of a string.
* The index parameter is the index of the 0 at the end of the string.
*/
void yylex_TrimEnd(char *s, size_t index)
{
int i;
for (i = (int)index - 1; i >= 0 && (s[i] == ' ' || s[i] == '\t'); i--)
s[i] = 0;
}
size_t
yylex_ReadBracketedSymbol(char *dest, size_t index)
{
char sym[MAXSYMLEN + 1];
char ch;
size_t i = 0;
size_t length, maxLength;
for (ch = *pLexBuffer;
ch != '}' && ch != '"' && ch != '\n';
ch = *(++pLexBuffer)) {
if (ch == '\\') {
ch = *(++pLexBuffer);
maxLength = MAXSYMLEN - i;
length = CopyMacroArg(&sym[i], maxLength, ch);
if (length != 0)
i += length;
else
fatalerror("Illegal character escape '%c'", ch);
} else
yylex_SymbolWriteChar(sym, i++, ch);
}
yylex_SymbolWriteChar(sym, i, 0);
maxLength = MAXSTRLEN - index; // it's assumed we're writing to a T_STRING
length = symvaluetostring(&dest[index], maxLength, sym);
if (*pLexBuffer == '}')
pLexBuffer++;
else
yyerror("Missing }");
return length;
}
void
yylex_ReadQuotedString()
{
size_t index = 0;
size_t length, maxLength;
while (*pLexBuffer != '"' && *pLexBuffer != '\n') {
char ch = *pLexBuffer++;
if (ch == '\\') {
ch = *pLexBuffer++;
switch (ch) {
case 'n':
ch = '\n';
break;
case 't':
ch = '\t';
break;
case '\\':
ch = '\\';
break;
case '"':
ch = '"';
break;
default:
maxLength = MAXSTRLEN - index;
length = CopyMacroArg(&yylval.tzString[index], maxLength, ch);
if (length != 0)
index += length;
else
fatalerror("Illegal character escape '%c'", ch);
ch = 0;
break;
}
} else if (ch == '{') {
// Get bracketed symbol within string.
index += yylex_ReadBracketedSymbol(yylval.tzString, index);
ch = 0;
}
if (ch)
yylex_StringWriteChar(yylval.tzString, index++, ch);
}
yylex_StringWriteChar(yylval.tzString, index, 0);
if (*pLexBuffer == '"')
pLexBuffer++;
else
yyerror("Unterminated string");
}
ULONG
yylex_NORMAL()
{
struct sLexString *pLongestFixed = NULL;
ULONG nFloatMask, nFloatLen;
ULONG linestart = AtLineStart;
AtLineStart = 0;
scanagain:
while (*pLexBuffer == ' ' || *pLexBuffer == '\t') {
linestart = 0;
pLexBuffer++;
}
if (*pLexBuffer == 0) {
// Reached the end of a file, macro, or rept.
if (yywrap() == 0) {
linestart = AtLineStart;
AtLineStart = 0;
goto scanagain;
}
}
// Try to match an identifier, macro argument (e.g. \1),
// or numeric literal.
yylex_GetFloatMaskAndFloatLen(&nFloatMask, &nFloatLen);
// Try to match a keyword or operator.
pLongestFixed = yylex_GetLongestFixed();
if (nFloatLen == 0 && pLongestFixed == NULL) {
// No keyword, identifier, operator, or numerical literal matches.
if (*pLexBuffer == '"') {
pLexBuffer++;
yylex_ReadQuotedString();
return T_STRING;
} else if (*pLexBuffer == '{') {
pLexBuffer++;
yylex_ReadBracketedSymbol(yylval.tzString, 0);
return T_STRING;
} else {
// It's not a keyword, operator, identifier, macro argument,
// numeric literal, string, or bracketed symbol, so just return
// the ASCII character.
if (*pLexBuffer == '\n')
AtLineStart = 1;
return *pLexBuffer++;
}
}
if (pLongestFixed == NULL || nFloatLen > pLongestFixed->nNameLength) {
// Longest match was an identifier, macro argument, or numeric literal.
struct sLexFloat *token = lexgetfloat(nFloatMask);
if (token->Callback) {
int done = token->Callback(pLexBuffer, nFloatLen);
if (!done)
goto scanagain;
}
pLexBuffer += nFloatLen;
if (token->nToken == T_ID && linestart) {
return T_LABEL;
} else {
return token->nToken;
}
}
// Longest match was a keyword or operator.
pLexBuffer += pLongestFixed->nNameLength;
return pLongestFixed->nToken;
}
ULONG
yylex_MACROARGS()
{
size_t index = 0;
size_t length, maxLength;
while (*pLexBuffer == ' ' || *pLexBuffer == '\t') {
pLexBuffer++;
}
while (*pLexBuffer != ',' && (*pLexBuffer != '\n')) {
char ch = *pLexBuffer++;
if (ch == '\\') {
ch = *pLexBuffer++;
switch (ch) {
case 'n':
ch = '\n';
break;
case 't':
ch = '\t';
break;
case '\\':
ch = '\\';
break;
default:
maxLength = MAXSTRLEN - index;
length = CopyMacroArg(&yylval.tzString[index], maxLength, ch);
if (length != 0)
index += length;
else
fatalerror("Illegal character escape '%c'", ch);
ch = 0;
break;
}
} else if (ch == '{') {
index += yylex_ReadBracketedSymbol(yylval.tzString, index);
ch = 0;
}
if (ch)
yylex_StringWriteChar(yylval.tzString, index++, ch);
}
if (index) {
yylex_StringWriteChar(yylval.tzString, index, 0);
// trim trailing white space at the end of the line
if (*pLexBuffer == '\n')
yylex_TrimEnd(yylval.tzString, index);
return T_STRING;
} else if (*pLexBuffer == '\n') {
pLexBuffer++;
AtLineStart = 1;
return '\n';
} else if (*pLexBuffer == ',') {
pLexBuffer++;
return ',';
}
fatalerror("Internal error in yylex_MACROARGS");
return 0;
}
ULONG
yylex(void)
{
switch (lexerstate) {
case LEX_STATE_NORMAL:
return yylex_NORMAL();
case LEX_STATE_MACROARGS:
return yylex_MACROARGS();
}
fatalerror("Internal error in yylex");
return 0;
}