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git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
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uz
2000-05-28 13:40:48 +00:00
parent 579491e8a4
commit 53dd513176
847 changed files with 91345 additions and 0 deletions
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198
src/ca65/ea.c Normal file
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/*****************************************************************************/
/* */
/* ea.c */
/* */
/* Effective address parsing for the ca65 macroassembler */
/* */
/* */
/* */
/* (C) 1998-2000 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@musoftware.de */
/* */
/* */
/* 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 "error.h"
#include "expr.h"
#include "instr.h"
#include "scanner.h"
#include "ea.h"
/*****************************************************************************/
/* Code */
/*****************************************************************************/
void GetEA (unsigned long* AddrMode, ExprNode** Expr, ExprNode** Bank)
/* Parse an effective address, return the possible modes in AddrMode, and the
* expression involved (if any) in Expr.
*/
{
/* Clear the expressions */
*Bank = *Expr = 0;
if (Tok == TOK_SEP) {
*AddrMode = AM_IMPLICIT;
} else if (Tok == TOK_HASH) {
/* #val */
NextTok ();
*Expr = Expression ();
*AddrMode = AM_IMM;
} else if (Tok == TOK_A) {
NextTok ();
*AddrMode = AM_ACCU;
} else if (Tok == TOK_LBRACK) {
/* [dir] or [dir],y */
NextTok ();
*Expr = Expression ();
Consume (TOK_RBRACK, ERR_RBRACK_EXPECTED);
if (Tok == TOK_COMMA) {
/* [dir],y */
NextTok ();
Consume (TOK_Y, ERR_Y_EXPECTED);
*AddrMode = AM_DIR_IND_LONG_Y;
} else {
/* [dir] */
*AddrMode = AM_DIR_IND_LONG;
}
} else if (Tok == TOK_LPAREN) {
/* One of the indirect modes */
NextTok ();
*Expr = Expression ();
if (Tok == TOK_COMMA) {
/* (expr,X) or (rel,S),y */
NextTok ();
if (Tok == TOK_X) {
/* (adr,x) */
NextTok ();
*AddrMode = AM_ABS_X_IND | AM_DIR_X_IND;
ConsumeRParen ();
} else if (Tok == TOK_S) {
/* (rel,s),y */
NextTok ();
*AddrMode = AM_STACK_REL_IND_Y;
ConsumeRParen ();
ConsumeComma ();
Consume (TOK_Y, ERR_Y_EXPECTED);
} else {
Error (ERR_SYNTAX);
}
} else {
/* (adr) or (adr),y */
ConsumeRParen ();
if (Tok == TOK_COMMA) {
/* (adr),y */
NextTok ();
Consume (TOK_Y, ERR_Y_EXPECTED);
*AddrMode = AM_DIR_IND_Y;
} else {
/* (adr) */
*AddrMode = AM_ABS_IND | AM_DIR_IND;
}
}
} else {
/* Remaining stuff:
*
* adr
* bank.adr
* adr,x
* bank.adr,x
* adr,y
* adr,s
*/
*Expr = Expression ();
if (Tok == TOK_DOT) {
/* Expr was a bank specification: bank.adr or bank.adr,x */
*Bank = *Expr;
NextTok ();
*Expr = Expression ();
if (Tok == TOK_COMMA) {
/* bank.adr,x */
NextTok ();
Consume (TOK_X, ERR_X_EXPECTED);
*AddrMode = AM_ABS_LONG_X;
} else {
/* bank.adr */
*AddrMode = AM_ABS_LONG;
}
} else {
if (Tok == TOK_COMMA) {
NextTok ();
switch (Tok) {
case TOK_X:
*AddrMode = AM_ABS_X | AM_DIR_X;
NextTok ();
break;
case TOK_Y:
*AddrMode = AM_ABS_Y | AM_DIR_Y;
NextTok ();
break;
case TOK_S:
*AddrMode = AM_STACK_REL;
NextTok ();
break;
default:
Error (ERR_SYNTAX);
}
} else {
*AddrMode = AM_ABS | AM_DIR;
}
}
}
}