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cc65/src/ca65/scanner.c

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/*****************************************************************************/
/* */
/* scanner.c */
/* */
/* The scanner for the ca65 macroassembler */
/* */
/* */
/* */
/* (C) 1998-2013, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
/* common */
#include "addrsize.h"
#include "attrib.h"
#include "chartype.h"
#include "check.h"
#include "filestat.h"
#include "fname.h"
#include "xmalloc.h"
/* ca65 */
#include "condasm.h"
#include "error.h"
#include "filetab.h"
#include "global.h"
#include "incpath.h"
#include "instr.h"
#include "istack.h"
#include "listing.h"
#include "macro.h"
#include "toklist.h"
#include "scanner.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Current input token incl. attributes */
Token CurTok = STATIC_TOKEN_INITIALIZER;
/* Struct to handle include files. */
typedef struct InputFile InputFile;
struct InputFile {
FILE* F; /* Input file descriptor */
FilePos Pos; /* Position in file */
token_t Tok; /* Last token */
int C; /* Last character */
StrBuf Line; /* The current input line */
int IncSearchPath; /* True if we've added a search path */
int BinSearchPath; /* True if we've added a search path */
InputFile* Next; /* Linked list of input files */
};
/* Struct to handle textual input data */
typedef struct InputData InputData;
struct InputData {
char* Text; /* Pointer to the text data */
const char* Pos; /* Pointer to current position */
int Malloced; /* Memory was malloced */
token_t Tok; /* Last token */
int C; /* Last character */
InputData* Next; /* Linked list of input data */
};
/* Input source: Either file or data */
typedef struct CharSource CharSource;
/* Set of input functions */
typedef struct CharSourceFunctions CharSourceFunctions;
struct CharSourceFunctions {
void (*MarkStart) (CharSource*); /* Mark the start pos of a token */
void (*NextChar) (CharSource*); /* Read next char from input */
void (*Done) (CharSource*); /* Close input source */
};
/* Input source: Either file or data */
struct CharSource {
CharSource* Next; /* Linked list of char sources */
token_t Tok; /* Last token */
int C; /* Last character */
int SkipN; /* For '\r\n' line endings, skip '\n\ if next */
const CharSourceFunctions* Func; /* Pointer to function table */
union {
InputFile File; /* File data */
InputData Data; /* Textual data */
} V;
};
/* Current input variables */
static CharSource* Source = 0; /* Current char source */
static unsigned FCount = 0; /* Count of input files */
static int C = 0; /* Current input character */
/* Force end of assembly */
int ForcedEnd = 0;
/* List of dot keywords with the corresponding tokens */
struct DotKeyword {
const char* Key; /* MUST be first field */
token_t Tok;
} DotKeywords [] = {
{ ".A16", TOK_A16 },
{ ".A8", TOK_A8 },
{ ".ADDR", TOK_ADDR },
{ ".ADDRSIZE", TOK_ADDRSIZE },
{ ".ALIGN", TOK_ALIGN },
{ ".AND", TOK_BOOLAND },
{ ".ASCIIZ", TOK_ASCIIZ },
{ ".ASIZE", TOK_ASIZE },
{ ".ASSERT", TOK_ASSERT },
{ ".AUTOIMPORT", TOK_AUTOIMPORT },
{ ".BANK", TOK_BANK },
{ ".BANKBYTE", TOK_BANKBYTE },
{ ".BANKBYTES", TOK_BANKBYTES },
{ ".BITAND", TOK_AND },
{ ".BITNOT", TOK_NOT },
{ ".BITOR", TOK_OR },
{ ".BITXOR", TOK_XOR },
{ ".BLANK", TOK_BLANK },
{ ".BSS", TOK_BSS },
{ ".BYT", TOK_BYTE },
{ ".BYTE", TOK_BYTE },
{ ".CASE", TOK_CASE },
{ ".CHARMAP", TOK_CHARMAP },
{ ".CODE", TOK_CODE },
{ ".CONCAT", TOK_CONCAT },
{ ".CONDES", TOK_CONDES },
{ ".CONST", TOK_CONST },
{ ".CONSTRUCTOR", TOK_CONSTRUCTOR },
{ ".CPU", TOK_CPU },
{ ".DATA", TOK_DATA },
{ ".DBG", TOK_DBG },
{ ".DBYT", TOK_DBYT },
{ ".DEBUGINFO", TOK_DEBUGINFO },
{ ".DEF", TOK_DEFINED },
{ ".DEFINE", TOK_DEFINE },
{ ".DEFINED", TOK_DEFINED },
{ ".DEFINEDMACRO", TOK_DEFINEDMACRO },
{ ".DELMAC", TOK_DELMAC },
{ ".DELMACRO", TOK_DELMAC },
{ ".DESTRUCTOR", TOK_DESTRUCTOR },
{ ".DWORD", TOK_DWORD },
{ ".ELSE", TOK_ELSE },
{ ".ELSEIF", TOK_ELSEIF },
{ ".END", TOK_END },
{ ".ENDENUM", TOK_ENDENUM },
{ ".ENDIF", TOK_ENDIF },
{ ".ENDMAC", TOK_ENDMACRO },
{ ".ENDMACRO", TOK_ENDMACRO },
{ ".ENDPROC", TOK_ENDPROC },
{ ".ENDREP", TOK_ENDREP },
{ ".ENDREPEAT", TOK_ENDREP },
{ ".ENDSCOPE", TOK_ENDSCOPE },
{ ".ENDSTRUCT", TOK_ENDSTRUCT },
{ ".ENDUNION", TOK_ENDUNION },
{ ".ENUM", TOK_ENUM },
{ ".ERROR", TOK_ERROR },
{ ".EXITMAC", TOK_EXITMACRO },
{ ".EXITMACRO", TOK_EXITMACRO },
{ ".EXPORT", TOK_EXPORT },
{ ".EXPORTZP", TOK_EXPORTZP },
{ ".FARADDR", TOK_FARADDR },
{ ".FATAL", TOK_FATAL },
{ ".FEATURE", TOK_FEATURE },
{ ".FILEOPT", TOK_FILEOPT },
{ ".FOPT", TOK_FILEOPT },
{ ".FORCEIMPORT", TOK_FORCEIMPORT },
{ ".FORCEWORD", TOK_FORCEWORD },
{ ".GLOBAL", TOK_GLOBAL },
{ ".GLOBALZP", TOK_GLOBALZP },
{ ".HIBYTE", TOK_HIBYTE },
{ ".HIBYTES", TOK_HIBYTES },
{ ".HIWORD", TOK_HIWORD },
{ ".I16", TOK_I16 },
{ ".I8", TOK_I8 },
{ ".IDENT", TOK_MAKEIDENT },
{ ".IF", TOK_IF },
{ ".IFBLANK", TOK_IFBLANK },
{ ".IFCONST", TOK_IFCONST },
{ ".IFDEF", TOK_IFDEF },
{ ".IFNBLANK", TOK_IFNBLANK },
{ ".IFNCONST", TOK_IFNCONST },
{ ".IFNDEF", TOK_IFNDEF },
{ ".IFNREF", TOK_IFNREF },
{ ".IFP02", TOK_IFP02 },
{ ".IFP4510", TOK_IFP4510 },
{ ".IFP816", TOK_IFP816 },
{ ".IFPC02", TOK_IFPC02 },
{ ".IFPDTV", TOK_IFPDTV },
{ ".IFPSC02", TOK_IFPSC02 },
{ ".IFREF", TOK_IFREF },
{ ".IMPORT", TOK_IMPORT },
{ ".IMPORTZP", TOK_IMPORTZP },
{ ".INCBIN", TOK_INCBIN },
{ ".INCLUDE", TOK_INCLUDE },
{ ".INTERRUPTOR", TOK_INTERRUPTOR },
{ ".ISIZE", TOK_ISIZE },
{ ".ISMNEM", TOK_ISMNEMONIC },
{ ".ISMNEMONIC", TOK_ISMNEMONIC },
{ ".LEFT", TOK_LEFT },
{ ".LINECONT", TOK_LINECONT },
{ ".LIST", TOK_LIST },
{ ".LISTBYTES", TOK_LISTBYTES },
{ ".LITERAL", TOK_LITERAL },
{ ".LOBYTE", TOK_LOBYTE },
{ ".LOBYTES", TOK_LOBYTES },
{ ".LOCAL", TOK_LOCAL },
{ ".LOCALCHAR", TOK_LOCALCHAR },
{ ".LOWORD", TOK_LOWORD },
{ ".MAC", TOK_MACRO },
{ ".MACPACK", TOK_MACPACK },
{ ".MACRO", TOK_MACRO },
{ ".MATCH", TOK_MATCH },
{ ".MAX", TOK_MAX },
{ ".MID", TOK_MID },
{ ".MIN", TOK_MIN },
{ ".MOD", TOK_MOD },
{ ".NOT", TOK_BOOLNOT },
{ ".NULL", TOK_NULL },
{ ".OR", TOK_BOOLOR },
{ ".ORG", TOK_ORG },
{ ".OUT", TOK_OUT },
{ ".P02", TOK_P02 },
{ ".P4510", TOK_P4510 },
{ ".P816", TOK_P816 },
{ ".PAGELEN", TOK_PAGELENGTH },
{ ".PAGELENGTH", TOK_PAGELENGTH },
{ ".PARAMCOUNT", TOK_PARAMCOUNT },
{ ".PC02", TOK_PC02 },
{ ".PDTV", TOK_PDTV },
{ ".POPCHARMAP", TOK_POPCHARMAP },
{ ".POPCPU", TOK_POPCPU },
{ ".POPSEG", TOK_POPSEG },
{ ".PROC", TOK_PROC },
{ ".PSC02", TOK_PSC02 },
{ ".PUSHCHARMAP", TOK_PUSHCHARMAP },
{ ".PUSHCPU", TOK_PUSHCPU },
{ ".PUSHSEG", TOK_PUSHSEG },
{ ".REF", TOK_REFERENCED },
{ ".REFERENCED", TOK_REFERENCED },
{ ".REFERTO", TOK_REFERTO },
{ ".REFTO", TOK_REFERTO },
{ ".RELOC", TOK_RELOC },
{ ".REPEAT", TOK_REPEAT },
{ ".RES", TOK_RES },
{ ".RIGHT", TOK_RIGHT },
{ ".RODATA", TOK_RODATA },
{ ".SCOPE", TOK_SCOPE },
{ ".SEGMENT", TOK_SEGMENT },
{ ".SET", TOK_SET },
{ ".SETCPU", TOK_SETCPU },
{ ".SHL", TOK_SHL },
{ ".SHR", TOK_SHR },
{ ".SIZEOF", TOK_SIZEOF },
{ ".SMART", TOK_SMART },
{ ".SPRINTF", TOK_SPRINTF },
{ ".STRAT", TOK_STRAT },
{ ".STRING", TOK_STRING },
{ ".STRLEN", TOK_STRLEN },
{ ".STRUCT", TOK_STRUCT },
{ ".TAG", TOK_TAG },
{ ".TCOUNT", TOK_TCOUNT },
{ ".TIME", TOK_TIME },
{ ".UNDEF", TOK_UNDEF },
{ ".UNDEFINE", TOK_UNDEF },
{ ".UNION", TOK_UNION },
{ ".VERSION", TOK_VERSION },
{ ".WARNING", TOK_WARNING },
{ ".WORD", TOK_WORD },
{ ".XMATCH", TOK_XMATCH },
{ ".XOR", TOK_BOOLXOR },
{ ".ZEROPAGE", TOK_ZEROPAGE },
};
/*****************************************************************************/
/* CharSource functions */
/*****************************************************************************/
static void UseCharSource (CharSource* S)
/* Initialize a new input source and start to use it. */
{
/* Remember the current input char and token */
S->Tok = CurTok.Tok;
S->C = C;
/* Use the new input source */
S->Next = Source;
Source = S;
/* Read the first character from the new file */
S->SkipN = 0;
S->Func->NextChar (S);
/* Setup the next token so it will be skipped on the next call to
** NextRawTok().
*/
CurTok.Tok = TOK_SEP;
}
static void DoneCharSource (void)
/* Close the top level character source */
{
CharSource* S;
/* First, call the type specific function */
Source->Func->Done (Source);
/* Restore the old token */
CurTok.Tok = Source->Tok;
C = Source->C;
/* Remember the last stacked input source */
S = Source->Next;
/* Delete the top level one ... */
xfree (Source);
/* ... and use the one before */
Source = S;
}
/*****************************************************************************/
/* InputFile functions */
/*****************************************************************************/
static void IFMarkStart (CharSource* S)
/* Mark the start of the next token */
{
CurTok.Pos = S->V.File.Pos;
}
static void IFNextChar (CharSource* S)
/* Read the next character from the input file */
{
/* Check for end of line, read the next line if needed */
while (SB_GetIndex (&S->V.File.Line) >= SB_GetLen (&S->V.File.Line)) {
unsigned Len;
/* End of current line reached, read next line */
SB_Clear (&S->V.File.Line);
while (1) {
int N = fgetc (S->V.File.F);
if (N == '\n' && S->SkipN) {
N = fgetc (S->V.File.F);
}
S->SkipN = 0;
if (N == EOF) {
/* End of file. Accept files without a newline at the end */
if (SB_NotEmpty (&S->V.File.Line)) {
break;
}
/* No more data - add an empty line to the listing. This
** is a small hack needed to keep the PC output in sync.
*/
NewListingLine (&EmptyStrBuf, S->V.File.Pos.Name, FCount);
C = EOF;
return;
/* Check for end of line */
} else if (N == '\n') {
/* End of line */
break;
} else if (N == '\r') {
/* End of line, skip '\n' if it's the next character */
S->SkipN = 1;
break;
/* Collect other stuff */
} else {
/* Append data to line */
SB_AppendChar (&S->V.File.Line, N);
}
}
/* If we come here, we have a new input line. To avoid problems
** with strange line terminators, remove all whitespace from the
** end of the line, then add a single newline.
*/
Len = SB_GetLen (&S->V.File.Line);
while (Len > 0 && IsSpace (SB_AtUnchecked (&S->V.File.Line, Len-1))) {
--Len;
}
SB_Drop (&S->V.File.Line, SB_GetLen (&S->V.File.Line) - Len);
SB_AppendChar (&S->V.File.Line, '\n');
/* Terminate the string buffer */
SB_Terminate (&S->V.File.Line);
/* One more line */
S->V.File.Pos.Line++;
/* Remember the new line for the listing */
NewListingLine (&S->V.File.Line, S->V.File.Pos.Name, FCount);
}
/* Set the column pointer */
S->V.File.Pos.Col = SB_GetIndex (&S->V.File.Line);
/* Return the next character from the buffer */
C = SB_Get (&S->V.File.Line);
}
void IFDone (CharSource* S)
/* Close the current input file */
{
/* We're at the end of an include file. Check if we have any
** open .IFs, or any open token lists in this file. This
** enforcement is artificial, using conditionals that start
** in one file and end in another are uncommon, and don't
** allowing these things will help finding errors.
*/
CheckOpenIfs ();
/* If we've added search paths for this file, remove them */
if (S->V.File.IncSearchPath) {
PopSearchPath (IncSearchPath);
}
if (S->V.File.BinSearchPath) {
PopSearchPath (BinSearchPath);
}
/* Free the line buffer */
SB_Done (&S->V.File.Line);
/* Close the input file and decrement the file count. We will ignore
** errors here, since we were just reading from the file.
*/
(void) fclose (S->V.File.F);
--FCount;
}
/* Set of input file handling functions */
static const CharSourceFunctions IFFunc = {
IFMarkStart,
IFNextChar,
IFDone
};
int NewInputFile (const char* Name)
/* Open a new input file. Returns true if the file could be successfully opened
** and false otherwise.
*/
{
int RetCode = 0; /* Return code. Assume an error. */
char* PathName = 0;
FILE* F;
struct stat Buf;
StrBuf NameBuf; /* No need to initialize */
StrBuf Path = AUTO_STRBUF_INITIALIZER;
unsigned FileIdx;
CharSource* S;
/* If this is the main file, just try to open it. If it's an include file,
** search for it using the include path list.
*/
if (FCount == 0) {
/* Main file */
F = fopen (Name, "r");
if (F == 0) {
Fatal ("Cannot open input file '%s': %s", Name, strerror (errno));
}
} else {
/* We are on include level. Search for the file in the include
** directories.
*/
PathName = SearchFile (IncSearchPath, Name);
if (PathName == 0 || (F = fopen (PathName, "r")) == 0) {
/* Not found or cannot open, print an error and bail out */
Error ("Cannot open include file '%s': %s", Name, strerror (errno));
goto ExitPoint;
}
/* Use the path name from now on */
Name = PathName;
}
/* Stat the file and remember the values. There's a race condition here,
** since we cannot use fileno() (non-standard identifier in standard
** header file), and therefore not fstat. When using stat with the
** file name, there's a risk that the file was deleted and recreated
** while it was open. Since mtime and size are only used to check
** if a file has changed in the debugger, we will ignore this problem
** here.
*/
if (FileStat (Name, &Buf) != 0) {
Fatal ("Cannot stat input file '%s': %s", Name, strerror (errno));
}
/* Add the file to the input file table and remember the index */
FileIdx = AddFile (SB_InitFromString (&NameBuf, Name),
(FCount == 0)? FT_MAIN : FT_INCLUDE,
Buf.st_size, (unsigned long) Buf.st_mtime);
/* Create a new input source variable and initialize it */
S = xmalloc (sizeof (*S));
S->Func = &IFFunc;
S->V.File.F = F;
S->V.File.Pos.Line = 0;
S->V.File.Pos.Col = 0;
S->V.File.Pos.Name = FileIdx;
SB_Init (&S->V.File.Line);
/* Push the path for this file onto the include search lists */
SB_CopyBuf (&Path, Name, FindName (Name) - Name);
SB_Terminate (&Path);
S->V.File.IncSearchPath = PushSearchPath (IncSearchPath, SB_GetConstBuf (&Path));
S->V.File.BinSearchPath = PushSearchPath (BinSearchPath, SB_GetConstBuf (&Path));
SB_Done (&Path);
/* Count active input files */
++FCount;
/* Use this input source */
UseCharSource (S);
/* File successfully opened */
RetCode = 1;
ExitPoint:
/* Free an allocated name buffer */
xfree (PathName);
/* Return the success code */
return RetCode;
}
/*****************************************************************************/
/* InputData functions */
/*****************************************************************************/
static void IDMarkStart (CharSource* S attribute ((unused)))
/* Mark the start of the next token */
{
/* Nothing to do here */
}
static void IDNextChar (CharSource* S)
/* Read the next character from the input text */
{
C = *S->V.Data.Pos++;
if (C == '\0') {
/* End of input data */
--S->V.Data.Pos;
C = EOF;
}
}
void IDDone (CharSource* S)
/* Close the current input data */
{
/* Cleanup the current stuff */
if (S->V.Data.Malloced) {
xfree (S->V.Data.Text);
}
}
/* Set of input data handling functions */
static const CharSourceFunctions IDFunc = {
IDMarkStart,
IDNextChar,
IDDone
};
void NewInputData (char* Text, int Malloced)
/* Add a chunk of input data to the input stream */
{
CharSource* S;
/* Create a new input source variable and initialize it */
S = xmalloc (sizeof (*S));
S->Func = &IDFunc;
S->V.Data.Text = Text;
S->V.Data.Pos = Text;
S->V.Data.Malloced = Malloced;
/* Use this input source */
UseCharSource (S);
}
/*****************************************************************************/
/* Character classification functions */
/*****************************************************************************/
int IsIdChar (int C)
/* Return true if the character is a valid character for an identifier */
{
return IsAlNum (C) ||
(C == '_') ||
(C == '@' && AtInIdents) ||
(C == '$' && DollarInIdents);
}
int IsIdStart (int C)
/* Return true if the character may start an identifier */
{
return IsAlpha (C) || C == '_';
}
/*****************************************************************************/
/* Code */
/*****************************************************************************/
static unsigned DigitVal (unsigned char C)
/* Convert a digit into it's numerical representation */
{
if (IsDigit (C)) {
return C - '0';
} else {
return toupper (C) - 'A' + 10;
}
}
static void NextChar (void)
/* Read the next character from the input file */
{
Source->Func->NextChar (Source);
}
void LocaseSVal (void)
/* Make SVal lower case */
{
SB_ToLower (&CurTok.SVal);
}
void UpcaseSVal (void)
/* Make SVal upper case */
{
SB_ToUpper (&CurTok.SVal);
}
static int CmpDotKeyword (const void* K1, const void* K2)
/* Compare function for the dot keyword search */
{
return strcmp (((struct DotKeyword*)K1)->Key, ((struct DotKeyword*)K2)->Key);
}
static token_t FindDotKeyword (void)
/* Find the dot keyword in SVal. Return the corresponding token if found,
** return TOK_NONE if not found.
*/
{
struct DotKeyword K;
struct DotKeyword* R;
/* Initialize K */
K.Key = SB_GetConstBuf (&CurTok.SVal);
K.Tok = 0;
/* If we aren't in ignore case mode, we have to uppercase the keyword */
if (!IgnoreCase) {
UpcaseSVal ();
}
/* Search for the keyword */
R = bsearch (&K, DotKeywords, sizeof (DotKeywords) / sizeof (DotKeywords [0]),
sizeof (DotKeywords [0]), CmpDotKeyword);
if (R != 0) {
return R->Tok;
} else {
return TOK_NONE;
}
}
static void ReadIdent (void)
/* Read an identifier from the current input position into Ident. Filling SVal
** starts at the current position with the next character in C. It is assumed
** that any characters already filled in are ok, and the character in C is
** checked.
*/
{
/* Read the identifier */
do {
SB_AppendChar (&CurTok.SVal, C);
NextChar ();
} while (IsIdChar (C));
SB_Terminate (&CurTok.SVal);
/* If we should ignore case, convert the identifier to upper case */
if (IgnoreCase) {
UpcaseSVal ();
}
}
static void ReadStringConst (int StringTerm)
/* Read a string constant into SVal. */
{
/* Skip the leading string terminator */
NextChar ();
/* Read the string */
while (1) {
if (C == StringTerm) {
break;
}
if (C == '\n' || C == EOF) {
Error ("Newline in string constant");
break;
}
if (C == '\\' && StringEscapes) {
NextChar ();
switch (C) {
case EOF:
Error ("Unterminated escape sequence in string constant");
break;
case '\\':
case '\'':
case '"':
break;
case 't':
C = '\x09';
break;
case 'r':
C = '\x0D';
break;
case 'n':
C = '\x0A';
break;
case 'x':
NextChar ();
if (IsXDigit (C)) {
char high_nibble = DigitVal (C) << 4;
NextChar ();
if (IsXDigit (C)) {
C = high_nibble | DigitVal (C);
break;
}
}
/* FALLTHROUGH */
default:
Error ("Unsupported escape sequence in string constant");
break;
}
}
/* Append the char to the string */
SB_AppendChar (&CurTok.SVal, C);
/* Skip the character */
NextChar ();
}
/* Skip the trailing terminator */
NextChar ();
/* Terminate the string */
SB_Terminate (&CurTok.SVal);
}
static int Sweet16Reg (const StrBuf* Id)
/* Check if the given identifier is a sweet16 register. Return -1 if this is
** not the case, return the register number otherwise.
*/
{
unsigned RegNum;
char Check;
if (SB_GetLen (Id) < 2) {
return -1;
}
if (toupper (SB_AtUnchecked (Id, 0)) != 'R') {
return -1;
}
if (!IsDigit (SB_AtUnchecked (Id, 1))) {
return -1;
}
if (sscanf (SB_GetConstBuf (Id)+1, "%u%c", &RegNum, &Check) != 1 || RegNum > 15) {
/* Invalid register */
return -1;
}
/* The register number is valid */
return (int) RegNum;
}
void NextRawTok (void)
/* Read the next raw token from the input stream */
{
Macro* M;
/* If we've a forced end of assembly, don't read further */
if (ForcedEnd) {
CurTok.Tok = TOK_EOF;
return;
}
Restart:
/* Check if we have tokens from another input source */
if (InputFromStack ()) {
if (CurTok.Tok == TOK_IDENT && (M = FindDefine (&CurTok.SVal)) != 0) {
/* This is a define style macro - expand it */
MacExpandStart (M);
goto Restart;
}
return;
}
Again:
/* Skip whitespace, remember if we had some */
if ((CurTok.WS = IsBlank (C)) != 0) {
do {
NextChar ();
} while (IsBlank (C));
}
/* Mark the file position of the next token */
Source->Func->MarkStart (Source);
/* Clear the string attribute */
SB_Clear (&CurTok.SVal);
/* Generate line info for the current token */
NewAsmLine ();
/* Hex number or PC symbol? */
if (C == '$') {
NextChar ();
/* Hex digit must follow or DollarIsPC must be enabled */
if (!IsXDigit (C)) {
if (DollarIsPC) {
CurTok.Tok = TOK_PC;
return;
} else {
Error ("Hexadecimal digit expected");
}
}
/* Read the number */
CurTok.IVal = 0;
while (1) {
if (UnderlineInNumbers && C == '_') {
while (C == '_') {
NextChar ();
}
if (!IsXDigit (C)) {
Error ("Number may not end with underline");
}
}
if (IsXDigit (C)) {
if (CurTok.IVal & 0xF0000000) {
Error ("Overflow in hexadecimal number");
CurTok.IVal = 0;
}
CurTok.IVal = (CurTok.IVal << 4) + DigitVal (C);
NextChar ();
} else {
break;
}
}
/* This is an integer constant */
CurTok.Tok = TOK_INTCON;
return;
}
/* Binary number? */
if (C == '%') {
NextChar ();
/* 0 or 1 must follow */
if (!IsBDigit (C)) {
Error ("Binary digit expected");
}
/* Read the number */
CurTok.IVal = 0;
while (1) {
if (UnderlineInNumbers && C == '_') {
while (C == '_') {
NextChar ();
}
if (!IsBDigit (C)) {
Error ("Number may not end with underline");
}
}
if (IsBDigit (C)) {
if (CurTok.IVal & 0x80000000) {
Error ("Overflow in binary number");
CurTok.IVal = 0;
}
CurTok.IVal = (CurTok.IVal << 1) + DigitVal (C);
NextChar ();
} else {
break;
}
}
/* This is an integer constant */
CurTok.Tok = TOK_INTCON;
return;
}
/* Number? */
if (IsDigit (C)) {
char Buf[16];
unsigned Digits;
unsigned Base;
unsigned I;
long Max;
unsigned DVal;
/* Ignore leading zeros */
while (C == '0') {
NextChar ();
}
/* Read the number into Buf counting the digits */
Digits = 0;
while (1) {
if (UnderlineInNumbers && C == '_') {
while (C == '_') {
NextChar ();
}
if (!IsXDigit (C)) {
Error ("Number may not end with underline");
}
}
if (IsXDigit (C)) {
/* Buf is big enough to allow any decimal and hex number to
** overflow, so ignore excess digits here, they will be detected
** when we convert the value.
*/
if (Digits < sizeof (Buf)) {
Buf[Digits++] = C;
}
NextChar ();
} else {
break;
}
}
/* Allow zilog/intel style hex numbers with a 'h' suffix */
if (C == 'h' || C == 'H') {
NextChar ();
Base = 16;
Max = 0xFFFFFFFFUL / 16;
} else {
Base = 10;
Max = 0xFFFFFFFFUL / 10;
}
/* Convert the number using the given base */
CurTok.IVal = 0;
for (I = 0; I < Digits; ++I) {
if (CurTok.IVal > Max) {
Error ("Number out of range");
CurTok.IVal = 0;
break;
}
DVal = DigitVal (Buf[I]);
if (DVal >= Base) {
Error ("Invalid digits in number");
CurTok.IVal = 0;
break;
}
CurTok.IVal = (CurTok.IVal * Base) + DVal;
}
/* This is an integer constant */
CurTok.Tok = TOK_INTCON;
return;
}
/* Control command? */
if (C == '.') {
/* Remember and skip the dot */
NextChar ();
/* Check if it's just a dot */
if (!IsIdStart (C)) {
/* Just a dot */
CurTok.Tok = TOK_DOT;
} else {
/* Read the remainder of the identifier */
SB_AppendChar (&CurTok.SVal, '.');
ReadIdent ();
/* Dot keyword, search for it */
CurTok.Tok = FindDotKeyword ();
if (CurTok.Tok == TOK_NONE) {
/* Not found */
if (!LeadingDotInIdents) {
/* Invalid pseudo instruction */
Error ("'%m%p' is not a recognized control command", &CurTok.SVal);
goto Again;
}
/* An identifier with a dot. Check if it's a define style
** macro.
*/
if ((M = FindDefine (&CurTok.SVal)) != 0) {
/* This is a define style macro - expand it */
MacExpandStart (M);
goto Restart;
}
/* Just an identifier with a dot */
CurTok.Tok = TOK_IDENT;
}
}
return;
}
/* Indirect op for sweet16 cpu. Must check this before checking for local
** symbols, because these may also use the '@' symbol.
*/
if (CPU == CPU_SWEET16 && C == '@') {
NextChar ();
CurTok.Tok = TOK_AT;
return;
}
/* Local symbol? */
if (C == LocalStart) {
NextChar ();
if (IsIdChar (C)) {
/* Read a local identifier */
CurTok.Tok = TOK_LOCAL_IDENT;
SB_AppendChar (&CurTok.SVal, LocalStart);
ReadIdent ();
} else {
/* Read an unnamed label */
CurTok.IVal = 0;
CurTok.Tok = TOK_ULABEL;
if (C == '-' || C == '<') {
int PrevC = C;
do {
--CurTok.IVal;
NextChar ();
} while (C == PrevC);
} else if (C == '+' || C == '>') {
int PrevC = C;
do {
++CurTok.IVal;
NextChar ();
} while (C == PrevC);
}
}
return;
}
/* Identifier or keyword? */
if (IsIdStart (C)) {
/* Read the identifier */
ReadIdent ();
/* Check for special names. Bail out if we have identified the type of
** the token. Go on if the token is an identifier.
*/
switch (SB_GetLen (&CurTok.SVal)) {
case 1:
switch (toupper (SB_AtUnchecked (&CurTok.SVal, 0))) {
case 'A':
if (C == ':') {
NextChar ();
CurTok.Tok = TOK_OVERRIDE_ABS;
} else {
CurTok.Tok = TOK_A;
}
return;
case 'F':
if (C == ':') {
NextChar ();
CurTok.Tok = TOK_OVERRIDE_FAR;
return;
}
break;
case 'S':
if ((CPU == CPU_4510) || (CPU == CPU_65816)) {
CurTok.Tok = TOK_S;
return;
}
break;
case 'X':
CurTok.Tok = TOK_X;
return;
case 'Y':
CurTok.Tok = TOK_Y;
return;
case 'Z':
if (C == ':') {
NextChar ();
CurTok.Tok = TOK_OVERRIDE_ZP;
return;
} else {
if (CPU == CPU_4510) {
CurTok.Tok = TOK_Z;
return;
}
}
break;
default:
break;
}
break;
case 2:
if ((CPU == CPU_4510) &&
(toupper (SB_AtUnchecked (&CurTok.SVal, 0)) == 'S') &&
(toupper (SB_AtUnchecked (&CurTok.SVal, 1)) == 'P')) {
CurTok.Tok = TOK_S;
return;
}
/* FALL THROUGH */
default:
if (CPU == CPU_SWEET16 &&
(CurTok.IVal = Sweet16Reg (&CurTok.SVal)) >= 0) {
/* A sweet16 register number in sweet16 mode */
CurTok.Tok = TOK_REG;
return;
}
}
/* Check for define style macro */
if ((M = FindDefine (&CurTok.SVal)) != 0) {
/* Macro - expand it */
MacExpandStart (M);
goto Restart;
} else {
/* An identifier */
CurTok.Tok = TOK_IDENT;
}
return;
}
/* Ok, let's do the switch */
CharAgain:
switch (C) {
case '+':
NextChar ();
CurTok.Tok = TOK_PLUS;
return;
case '-':
NextChar ();
CurTok.Tok = TOK_MINUS;
return;
case '/':
NextChar ();
if (C != '*') {
CurTok.Tok = TOK_DIV;
} else if (CComments) {
/* Remember the position, then skip the '*' */
Collection LineInfos = STATIC_COLLECTION_INITIALIZER;
GetFullLineInfo (&LineInfos);
NextChar ();
do {
while (C != '*') {
if (C == EOF) {
LIError (&LineInfos, "Unterminated comment");
ReleaseFullLineInfo (&LineInfos);
DoneCollection (&LineInfos);
goto CharAgain;
}
NextChar ();
}
NextChar ();
} while (C != '/');
NextChar ();
ReleaseFullLineInfo (&LineInfos);
DoneCollection (&LineInfos);
goto Again;
}
return;
case '*':
NextChar ();
CurTok.Tok = TOK_MUL;
return;
case '^':
NextChar ();
CurTok.Tok = TOK_XOR;
return;
case '&':
NextChar ();
if (C == '&') {
NextChar ();
CurTok.Tok = TOK_BOOLAND;
} else {
CurTok.Tok = TOK_AND;
}
return;
case '|':
NextChar ();
if (C == '|') {
NextChar ();
CurTok.Tok = TOK_BOOLOR;
} else {
CurTok.Tok = TOK_OR;
}
return;
case ':':
NextChar ();
switch (C) {
case ':':
NextChar ();
CurTok.Tok = TOK_NAMESPACE;
break;
case '-':
case '<':
{
int PrevC = C;
CurTok.IVal = 0;
do {
--CurTok.IVal;
NextChar ();
} while (C == PrevC);
CurTok.Tok = TOK_ULABEL;
break;
}
case '+':
case '>':
{
int PrevC = C;
CurTok.IVal = 0;
do {
++CurTok.IVal;
NextChar ();
} while (C == PrevC);
CurTok.Tok = TOK_ULABEL;
break;
}
case '=':
NextChar ();
CurTok.Tok = TOK_ASSIGN;
break;
default:
CurTok.Tok = TOK_COLON;
break;
}
return;
case ',':
NextChar ();
CurTok.Tok = TOK_COMMA;
return;
case ';':
NextChar ();
while (C != '\n' && C != EOF) {
NextChar ();
}
goto CharAgain;
case '#':
NextChar ();
CurTok.Tok = TOK_HASH;
return;
case '(':
NextChar ();
CurTok.Tok = TOK_LPAREN;
return;
case ')':
NextChar ();
CurTok.Tok = TOK_RPAREN;
return;
case '[':
NextChar ();
CurTok.Tok = TOK_LBRACK;
return;
case ']':
NextChar ();
CurTok.Tok = TOK_RBRACK;
return;
case '{':
NextChar ();
CurTok.Tok = TOK_LCURLY;
return;
case '}':
NextChar ();
CurTok.Tok = TOK_RCURLY;
return;
case '<':
NextChar ();
if (C == '=') {
NextChar ();
CurTok.Tok = TOK_LE;
} else if (C == '<') {
NextChar ();
CurTok.Tok = TOK_SHL;
} else if (C == '>') {
NextChar ();
CurTok.Tok = TOK_NE;
} else {
CurTok.Tok = TOK_LT;
}
return;
case '=':
NextChar ();
CurTok.Tok = TOK_EQ;
return;
case '!':
NextChar ();
CurTok.Tok = TOK_BOOLNOT;
return;
case '>':
NextChar ();
if (C == '=') {
NextChar ();
CurTok.Tok = TOK_GE;
} else if (C == '>') {
NextChar ();
CurTok.Tok = TOK_SHR;
} else {
CurTok.Tok = TOK_GT;
}
return;
case '~':
NextChar ();
CurTok.Tok = TOK_NOT;
return;
case '\'':
/* Hack: If we allow ' as terminating character for strings, read
** the following stuff as a string, and check for a one character
** string later.
*/
if (LooseStringTerm) {
ReadStringConst ('\'');
if (SB_GetLen (&CurTok.SVal) == 1) {
CurTok.IVal = SB_AtUnchecked (&CurTok.SVal, 0);
CurTok.Tok = TOK_CHARCON;
} else {
CurTok.Tok = TOK_STRCON;
}
} else {
/* Always a character constant */
NextChar ();
if (C == EOF || IsControl (C)) {
Error ("Illegal character constant");
goto CharAgain;
}
CurTok.IVal = C;
CurTok.Tok = TOK_CHARCON;
NextChar ();
if (C != '\'') {
if (!MissingCharTerm) {
Error ("Illegal character constant");
}
} else {
NextChar ();
}
}
return;
case '\"':
ReadStringConst ('\"');
CurTok.Tok = TOK_STRCON;
return;
case '\\':
/* Line continuation? */
if (LineCont) {
NextChar ();
/* Next char should be a LF, if not, will result in an error later */
if (C == '\n') {
/* Ignore the '\n' */
NextChar ();
goto Again;
} else {
/* Make it clear what the problem is: */
Error ("EOL expected.");
}
}
break;
case '\n':
NextChar ();
CurTok.Tok = TOK_SEP;
return;
case EOF:
CheckInputStack ();
/* In case of the main file, do not close it, but return EOF. */
if (Source && Source->Next) {
DoneCharSource ();
goto Again;
} else {
CurTok.Tok = TOK_EOF;
}
return;
}
/* If we go here, we could not identify the current character. Skip it
** and try again.
*/
Error ("Invalid input character: 0x%02X", C & 0xFF);
NextChar ();
goto Again;
}
int GetSubKey (const char* const* Keys, unsigned Count)
/* Search for a subkey in a table of keywords. The current token must be an
** identifier and all keys must be in upper case. The identifier will be
** uppercased in the process. The function returns the index of the keyword,
** or -1 if the keyword was not found.
*/
{
unsigned I;
/* Must have an identifier */
PRECONDITION (CurTok.Tok == TOK_IDENT);
/* If we aren't in ignore case mode, we have to uppercase the identifier */
if (!IgnoreCase) {
UpcaseSVal ();
}
/* Do a linear search (a binary search is not worth the effort) */
for (I = 0; I < Count; ++I) {
if (SB_CompareStr (&CurTok.SVal, Keys [I]) == 0) {
/* Found it */
return I;
}
}
/* Not found */
return -1;
}
unsigned char ParseAddrSize (void)
/* Check if the next token is a keyword that denotes an address size specifier.
** If so, return the corresponding address size constant, otherwise output an
** error message and return ADDR_SIZE_DEFAULT.
*/
{
unsigned char AddrSize;
/* Check for an identifier */
if (CurTok.Tok != TOK_IDENT) {
Error ("Address size specifier expected");
return ADDR_SIZE_DEFAULT;
}
/* Convert the attribute */
AddrSize = AddrSizeFromStr (SB_GetConstBuf (&CurTok.SVal));
if (AddrSize == ADDR_SIZE_INVALID) {
Error ("Address size specifier expected");
AddrSize = ADDR_SIZE_DEFAULT;
}
/* Done */
return AddrSize;
}
void InitScanner (const char* InFile)
/* Initialize the scanner, open the given input file */
{
/* Open the input file */
NewInputFile (InFile);
}
void DoneScanner (void)
/* Release scanner resources */
{
DoneCharSource ();
}
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