Aryadev Chavali
4990d93a1c
Essentially a presult_t contains one of these: 1) A label construction, which stores the label symbol into `label` (PRES_LABEL) 2) An instruction that calls upon a label, storing the instruction in `instruction` and the label name in `label` (PRES_LABEL_ADDRESS) 3) An instruction that uses a relative address offset, storing the instruction in `instruction` and the offset wanted into `relative_address` (PRES_RELATIVE_ADDRESS) 4) An instruction that requires no further processing, storing the instruction into `instruction` (PRES_COMPLETE_INSTRUCTION) In the processing stage, we resolve all calls by iterating one by one and maintaining an absolute instruction address. Pretty nice, lots more machinery involved in parsing now.
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/* Copyright (C) 2023 Aryadev Chavali
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* You may distribute and modify this code under the terms of the
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* GPLv2 license. You should have received a copy of the GPLv2
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* license with this file. If not, please write to:
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* aryadev@aryadevchavali.com.
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* Created: 2023-10-24
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* Author: Aryadev Chavali
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* Description: Parser for assembly language
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*/
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#ifndef PARSER_H
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#define PARSER_H
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#include "./lexer.h"
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#include <lib/inst.h>
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typedef enum
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{
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PERR_OK = 0,
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PERR_INTEGER_OVERFLOW,
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PERR_NOT_A_NUMBER,
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PERR_EXPECTED_UTYPE,
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PERR_EXPECTED_TYPE,
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PERR_EXPECTED_SYMBOL,
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PERR_EXPECTED_OPERAND,
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PERR_UNKNOWN_OPERATOR,
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PERR_INVALID_RELATIVE_ADDRESS,
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PERR_UNKNOWN_LABEL,
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} perr_t;
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const char *perr_as_cstr(perr_t);
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typedef struct
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{
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inst_t instruction;
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char *label;
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s_word relative_address;
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enum PResult_Type
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{
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PRES_LABEL = 0,
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PRES_LABEL_ADDRESS,
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PRES_RELATIVE_ADDRESS,
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PRES_COMPLETE_RESULT,
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} type;
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} presult_t;
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perr_t parse_next(token_stream_t *, presult_t *);
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perr_t process_presults(presult_t *, size_t, inst_t **, size_t *);
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perr_t parse_stream(token_stream_t *, inst_t **, size_t *);
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#endif
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