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git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@141 4df02467-bbd4-4a76-a152-e7ce94205b78
78 lines
3.1 KiB
C
78 lines
3.1 KiB
C
// ACME - a crossassembler for producing 6502/65c02/65816/65ce02 code.
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// Copyright (C) 1998-2020 Marco Baye
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// Have a look at "acme.c" for further info
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//
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// ALU stuff (the expression parser)
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#ifndef alu_H
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#define alu_H
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#include "config.h"
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// types
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/*
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enum expression_type {
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EXTY_EMPTY, // next char after space was comma or end-of-statement
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EXTY_NUMBER, // int or float (what is returned by the current functions)
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EXTY_STRING, // TODO
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EXTY_REGISTER, // reserved cpu constant (register names), TODO
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EXTY_LIST // TODO
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};
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*/
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struct expression {
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//enum expression_type type;
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struct number number;
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boolean is_empty; // nothing parsed (first character was a delimiter) FIXME - make into its own result type!
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int open_parentheses; // number of parentheses still open
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boolean is_parenthesized; // whole expression was in parentheses (indicating indirect addressing)
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};
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// constants
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// flag bits in number struct:
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#define NUMBER_IS_FLOAT (1u << 6) // floating point value
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#define NUMBER_EVER_UNDEFINED (1u << 5) // value once was related to undefined
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// expression. Needed for producing the same addresses in all passes; because in
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// the first pass there will almost for sure be labels that are undefined, you
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// can't simply get the addressing mode from looking at the parameter's value.
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#define NUMBER_IS_DEFINED (1u << 4) // 0: undefined expression (value will be zero). 1: known result
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#define NUMBER_FITS_BYTE (1u << 3) // value is guaranteed to fit in one byte
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#define NUMBER_FORCES_24 (1u << 2) // value usage forces 24-bit usage
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#define NUMBER_FORCES_16 (1u << 1) // value usage forces 16-bit usage
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#define NUMBER_FORCES_8 (1u << 0) // value usage forces 8-bit usage
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#define NUMBER_FORCEBITS (NUMBER_FORCES_8 | NUMBER_FORCES_16 | NUMBER_FORCES_24)
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// create dynamic buffer, operator/function trees and operator/operand stacks
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extern void ALU_init(void);
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// FIXME - replace all the functions below with a single one using a "flags" arg!
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/* its return value would then be "error"/"ok".
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// input flags:
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#define ACCEPT_EMPTY (1u << 0) // if not given, throws error
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#define ACCEPT_UNDEFINED (1u << 1) // if not given, undefined throws serious error
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//#define ACCEPT_INT (1u << ) needed when strings come along!
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#define ACCEPT_FLOAT (1u << 2) // if not given, floats are converted to integer
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#define ACCEPT_OPENPARENTHESIS (1u << 3) // if not given, throws syntax error
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//#define ACCEPT_STRING
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// do I need ACCEPT_INT and/or ACCEPT_ADDRESS?
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*/
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// stores int value if given. Returns whether stored. Throws error if undefined.
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extern boolean ALU_optional_defined_int(intval_t *target);
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// returns int value (0 if result was undefined)
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extern intval_t ALU_any_int(void);
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// stores int value and flags (floats are transformed to int)
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// if result was undefined, serious error is thrown
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extern void ALU_defined_int(struct number *intresult);
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// stores int value and flags, allowing for "paren" '(' too many (x-indirect addr).
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extern void ALU_addrmode_int(struct expression *expression, int paren);
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// stores value and flags (result may be either int or float)
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extern void ALU_any_result(struct number *result);
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#endif
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